CN1819287A - Luminescent light source and luminescent light source array - Google Patents

Abstract

A light source and an array of light sources. An object of the present invention is to provide a light-emitting light source capable of increasing the number of divisions of a reflection member without reducing the pitch interval of reflection regions. As a solution, the luminescent light source (21) has: a reflective member (26) that reflects light; a mold portion (22) disposed on the light reflection surface side of the reflective member (26); (22) Light-emitting elements of three colors of red, blue, and green for projecting light. In the reflective member (26), rectangular reflective regions (28i, 28j, 28k, ...) are arranged vertically and horizontally in a grid pattern.

Description

Luminous light source and luminous light source array

technical field

The present invention relates to a light emitting source and a light emitting source array, in particular to a light emitting source and a light emitting source array utilizing LED (light emitting diode) chips. The present invention also relates to an illuminating device and a liquid crystal display device using an array of light-emitting light sources.

Background technique

As a light-emitting light source having a large area and high light utilization efficiency, there is a light-emitting light source disclosed in Patent Document 1. FIG. 1 is a cross-sectional view showing part of such a light-emitting light source 11 . The light emitting source 11 arranges a white or monochromatic light emitting element 13 on the back center of the mold part 14 made of transparent resin, and vapor-deposits a metal film such as Al, Au, Ag, etc. as concentric circles formed on the back of the mold part 14. shape pattern, thereby forming the reflective member 12. FIG. 2 is a front view showing the light emitting element 13 and the reflection member 12 with the mold portion 14 removed from the light emitting source 11 . The reflective member 12 has a concentric circular shape and is composed of a plurality of belt-shaped reflective regions 12a, 12b, . . . arranged concentrically.

However, as shown in FIG. 1, in this light-emitting light source 11, among the lights emitted from the light-emitting element 13, the light L1 incident on the central portion (hereinafter referred to as the direct emission region) 15a of the front of the mold portion 14 is transmitted directly. The output region 15a is emitted to the front side. And the light L2 incident on the area (hereinafter referred to as the total reflection area) 15b except the direct emission area 15a of the front surface of the mold part 14 is totally reflected by the total reflection area 15b, reflected by the reflection member 12, and then transmitted. The total reflection area 15b emits to the front. Therefore, in such a light-emitting light source 11, the width A of the light L2 reflected by one reflection region (for example, 12c) is substantially equal to the width of the reflection region (for example, 12c).

In the backlight for color liquid crystal displays, when using multi-color light sources such as red LEDs, green LEDs, and blue LEDs, the color rendering of the three primary colors of color liquid crystal displays is better than when using white light sources such as white LEDs. Excellent color reproduction. However, in the light-emitting light source 11 of the above-mentioned structure, when the light-emitting elements of three light-emitting colors, such as red, green, and blue, are arranged in the center of the reflective member 12 to constitute a white light source, there is separation of light in each color, and there is no light in the light. The problem of color unevenness occurs in the light source 11 . The reason for this will be described below. FIG. 3 shows the state of light of each color when light-emitting elements 13R, 13G, and 13B of three light-emitting colors of red, green, and blue are arranged in the center of light-emitting light source 11 . For example, in FIG. 3, red light is represented by LR, green light is represented by LG, blue light is represented by LB, and the irradiation area of red light LR separated from the light source 11 by a certain distance is represented by AR, and AG is represented by AG. The irradiated area of the green light LG is denoted by AB the irradiated area of the blue light LB.

In the case of the light-emitting light source 11, since the positions of the light-emitting elements 13R, 13G, and 13B are slightly shifted, after being reflected by the total reflection region 15b, the outgoing direction of the light reflected by the reflection region 12c is different according to the color of the light. , so the irradiation areas AR, AG, and AB of each color are also staggered from each other. Therefore, the area where the light of each color overlaps to become white light is the area shaded in FIG. 3 . It can be seen from FIG. 3 that the white light area marked with oblique lines is narrower than the reflective area 12c, and in the area outside it, the emitted light is colored, resulting in color unevenness.

To solve such a problem, each reflective area 12a, 12b, . For example, in the luminescent light source 16 shown in FIG. 4, the reflective area 12c is divided into three reflective areas 19a, 19b, and 19c. In the reflective area 19a, the reflective area 19a is designed to emit blue light LB to the front direction, In the reflective region 19b, the reflective region 19b is designed to emit the green light LG in the front direction, and in the reflective region 19c, the reflective region 19c is designed to emit the red light LR in the front direction.

In the light emitting source 16 designed in this way, the area where the light of each color is superimposed to become white light is substantially the same as the whole of the reflection areas 19a, 19b, and 19c (that is, the reflection area 12c) as shown in FIG. 4 .

It can also be known from the example in FIG. 4 that even in the case of using multi-color light-emitting elements, if the number of divisions of the reflective parts of the light source is increased, the color unevenness of the light-emitting light source will be reduced and the uniformity of color will be improved. Moreover, in a single-color or multi-color light-emitting element, if the number of divisions of the reflective member is increased, the direction of the light can be finely set, so the degree of freedom in the design of the optical path can be improved, and the outgoing direction of the light can be adjusted more finely. , and improve the uniformity of light intensity.

Therefore, it is considered that the number of divisions (the number of reflection regions) of the reflection member 12 as shown in FIG. The reflective member 12 is a reflective member that subdivides each reflective region into three as a base. Such a reflective member is shown in FIG. 6 . In the reflection member 12 shown in FIG. 6, the number of divisions of the reflection member 12 is 9, and the pitch interval P of the reflection regions 17a, 17b, 17c, 18a, 18b, 18c, 19a, 19b, 19c is 2mm. Thus, although the color uniformity of the light-emitting light source can be improved when using the reflective member 12 as shown in FIG. , increasing the cost. That is, if the number of divisions of the reflection member 12 is increased, there is a problem that a balance between performance improvement and cost of the light-emitting light source cannot be obtained.

Furthermore, since the light emitting elements 13R, 13G, 13B are two-dimensionally arranged, the distance between the light emitting elements 13R, 13G, 13B of each color and the reflective regions 12a, 12b, . . . is different depending on the viewing direction. Therefore, in the concentric circular reflective members 12 having one point as the center and the same distance in the circumferential direction, the overlapping (color mixing) of the same degree cannot be obtained in the entire circumferential direction. Referring to FIG. 4 for specific description, when red light-emitting elements 13R, green light-emitting elements 13G, and blue light-emitting elements 13B are arranged sequentially from the left side of the face, on the left side, they are arranged in order from the inner peripheral side to emit light vertically. The reflection region 19a for red light, the reflection region 19b for vertically emitting green light, and the reflection region 19c for vertically emitting blue light. On the contrary, on the right side of the light-emitting elements 13R, 13G, and 13B, reflective regions 19c that vertically emit blue light, reflective regions 19b that vertically emit green light, and reflective regions that vertically emit red light must be arranged in order from the inner peripheral side. 19a. Such an arrangement cannot be realized by a belt-shaped reflective area.

Contents of the invention

A main object of the present invention is to provide a light-emitting light source capable of increasing the number of divisions of a reflection member without reducing the pitch interval of reflection regions. Moreover, another object of the present invention is to set the direction of the light in detail in the light emitting source, improve the degree of freedom in the design of the optical path, and thereby adjust the outgoing direction of the light more finely.

The first light-emitting light source of the present invention has: a reflective member that reflects light, a light-guiding portion disposed on the light-reflecting surface side of the reflecting member, and a light-emitting element that projects light to the light-guiding portion, wherein the light-emitting The element is disposed in the central area of the reflective member, the light guide has a light exit surface for emitting light emitted from the light emitting element and light of the light emitting element reflected by the reflective member to the outside, and the reflective member has a light reflective surface. A surface for reflecting light emitted from the light emitting element and reflected by the light exit surface of the light guide, wherein the light reflection surface is composed of a plurality of reflection regions arranged in at least two directions.

The 1st light-emitting light source of the present invention constitutes the light reflection surface of the reflective member by a plurality of reflective regions arranged along at least two directions, so even if the pitch interval of the reflective regions is not reduced, the number of divisions of the reflective member (reflective member) can be increased. number of regions). Therefore, the advancing direction of the light inside the light emitting source can be finely set, so the degree of freedom in designing the optical path is improved, and the outgoing direction of the light can be adjusted more finely. Therefore, the light intensity distribution of the light emitted from the light emitting source can be made uniform. In addition, in the case of using light-emitting elements with multiple light-emitting colors, color uniformity can be improved, color unevenness can be reduced, and the quality of light-emitting light sources can be improved. Moreover, since there is no need to reduce the pitch interval of the reflective area, the degree of freedom in optical path design is improved, so that the outgoing direction of light can be adjusted more carefully. Even if the light intensity or color uniformity is improved, it will not affect the reflective part. Manufacturing increases difficulty, or increases cost.

Furthermore, the arrangement of the plurality of reflective regions in at least two directions is not limited to the arrangement in two perpendicular directions. For example, it may be the case that the reflection regions are arranged along at least two directions defined by polar coordinates (that is, the radial direction and the circumferential direction). Moreover, it is also possible to arrange along arbitrary curves in at least two directions.

The second light-emitting light source of the present invention has: a reflection member that reflects light, a light guide portion disposed on the light reflection surface side of the reflection member, and a light emitting element that projects light to the light guide portion. In the central area of the reflective member, the above-mentioned light guide part has a light exit surface, which emits the light emitted from the above-mentioned light-emitting element and the light of the above-mentioned light-emitting element reflected by the above-mentioned reflective member to the outside, and the above-mentioned reflective member has a light reflective surface, which will The light emitted from the light-emitting element and reflected by the light-emitting surface of the light-guiding portion is reflected, and the light-reflecting surface is formed by a mosaic arrangement of a plurality of reflection regions.

Here, the plurality of reflective regions arranged in a mosaic pattern refers to a region in which reflective regions having approximately the same vertical and horizontal dimensions (or about several times the aspect ratio) are arranged without gaps. Furthermore, each reflective region may have the same shape, or a combination of reflective regions of different shapes may be used, or a region in which irregularly shaped reflective regions are arranged. In addition, the reflective regions may be arranged regularly or irregularly.

In the second light-emitting light source of the present invention, a plurality of reflective regions are arranged in a mosaic shape to constitute the reflective region, so even if the pitch interval of the reflective regions is not reduced, the number of divisions of the reflective surface of the reflective member (the number of reflective regions of the reflective region) can be increased. quantity). Therefore, the advancing direction of the light inside the light emitting source can be finely set, the degree of freedom in optical path design is improved, and the outgoing direction of the light can be adjusted more finely. Therefore, the light intensity distribution of the light emitted from the light emitting source can be made uniform. In addition, in the case of using light-emitting elements with multiple light-emitting colors, color uniformity can be improved, color unevenness can be reduced, and the quality of light-emitting light sources can be improved. Moreover, since there is no need to reduce the pitch interval of the reflective area, the degree of freedom in optical path design is improved, so that the outgoing direction of light can be adjusted more carefully. Even if the light intensity or color uniformity is improved, it will not affect the reflective part. Manufacturing increases difficulty, or increases cost.

In the embodiment of the first or second light-emitting light source of the present invention, the reflective area is square, rectangular, hexagonal, triangular or fan-shaped. Therefore, the reflection regions can be arranged without gaps to form a light reflection surface, and the light utilization efficiency can be improved. In particular, when the reflective area is arranged by dividing the light reflecting surface of the reflecting member into concentric belt-shaped areas centered on its optical axis, and dividing this area into a plurality of areas along the circumferential direction, there can be no gap. Fan-shaped multiple reflective areas are arranged in an orderly manner.

In another embodiment of the first or second light-emitting light source of the present invention, it is characterized in that, between the reflection regions adjacent in each direction in which the above-mentioned reflection regions are arranged, the feature quantities representing each reflection region are different from each other. .

In yet another embodiment of the first or second light-emitting light source of the present invention, it is characterized in that, between the reflection regions adjacent in the direction between the directions in which the above-mentioned reflection regions are arranged, the characteristics of each reflection region are represented. The quantities are different from each other. Here, for example, in the case where the direction in which the reflective regions are arranged is an opposite direction, the direction between means a diagonal direction which is a direction between the opposite directions.

In the above-mentioned two kinds of embodiments, if each reflective area is represented by a curved surface formula containing one or two or more than two feature quantities (parameters), then by properly determining the value of the feature quantity that characterizes each curved surface, it can be adjusted by The reflection direction, diffusion degree, etc. of the light reflected by each reflection area can facilitate the design of the reflection member.

For example, as the above-mentioned characteristic quantity, the displacement of each of the above-mentioned reflection regions on the optical axis direction of the above-mentioned reflection member can be selected, and by appropriately designing the displacement of each reflection region on the optical axis direction, the amount of reflection reflected by each reflection region can be adjusted. The reflection direction and diffusion degree of light, etc., can facilitate the design of the reflection member.

Moreover, if the above-mentioned reflection areas are made to appear as conical surfaces, and the radius of curvature is used as the characteristic quantity of the conical surface, the reflection direction of the light reflected by each reflection area can be adjusted by the curvature radius, and the uniformity of light intensity in the narrow area can be improved. sex. In addition, in the case of using a plurality of light emitting elements, it is possible to improve color mixing properties in a narrow area and improve color uniformity.

Moreover, if the above-mentioned reflective regions are made to appear as conical surfaces, and the conical coefficient is used as the characteristic quantity of the conical surface, the diffusion of the light reflected by each reflective region can be adjusted according to the distance from the light-emitting element by using the conical coefficient, and it can be used in a wide range. Improves the uniformity of light intensity in an area. In addition, when a plurality of light emitting elements are used, color mixing performance can be improved over a wide area, and color uniformity can be improved.

Still another embodiment of the first or second light-emitting light source of the present invention includes a plurality of the above-mentioned light-emitting elements having different light-emitting colors. In the light-emitting light source of the present invention, even when light from a plurality of light-emitting elements having different light-emitting colors is mixed to emit light in a color different from that of the original light-emitting elements, the light can be mixed uniformly and color unevenness can be reduced.

In particular, if the light of each light-emitting element is reflected by the reflection area so that in the adjacent reflection area, the light emitted from different light-emitting elements is emitted substantially perpendicularly to the front direction, then the overlap of the lights of each light-emitting element can be enlarged. range, thereby reducing color unevenness.

Still another embodiment of the first or second light-emitting light source of the present invention is characterized in that the surface of the light guide part is divided into a plurality of regions, and the inclination angle or inclination direction of the surface is changed for each of the divided regions. . According to this embodiment, the emission direction or reflection of the light distributed from the light-emitting element to each divided area on the surface of the light guide can be adjusted with a high degree of freedom by the inclination angle or inclination direction of each area on the surface of the light guide. direction. Therefore, the uniformity of the light intensity of the light emitting source can be further improved. Furthermore, when light emitting elements of multiple colors are used, the color mixing property of light emitted from each light emitting element can be further improved, and color unevenness can be reduced.

The light-emitting light source array of the present invention is characterized in that a plurality of the first or second light-emitting light sources of the present invention are arrayed. According to such a light-emitting light source array, it is possible to realize a large-area and thin surface light source with an improved degree of freedom in optical path design, a more finely adjusted light emission direction, and a uniform light intensity distribution of the emitted light. Furthermore, even when a plurality of light-emitting elements are used, it is possible to uniformly mix the light of each light-emitting color.

A method for setting an optical path of a light-emitting light source having a reflective member that reflects light, a light guide portion disposed on the light-reflective surface side of the reflective member, and a light-emitting element that projects light onto the light guide portion of the present invention is characterized in that: The method includes: disposing the light-emitting element in the central region of the reflective member; forming a light exit surface on the light guide so that the light emitted from the light-emitting element and the light of the light-emitting element reflected by the reflective member are emitted to the outside. and in the reflective member, a light reflective surface that reflects light emitted from the light emitting element and reflected by the light exit surface of the light guide part is formed by a plurality of reflective regions arranged in at least two directions, A step of setting the reflection direction of the reflected light generated by each reflection area, respectively.

In the light path setting method of the light emitting light source of the present invention, since the light is reflected by a plurality of reflection regions arranged in at least two directions, and the reflection directions of the reflected light can be set respectively, the internal light path of the light emitting source can be finely set. The forward direction of light and the degree of freedom of optical path design are improved, so that the outgoing direction of light can be adjusted more finely. Therefore, the light intensity distribution of the light emitted from the light emitting source can be made uniform. In addition, in the case of using light-emitting elements with multiple light-emitting colors, color uniformity can be improved, color unevenness can be reduced, and the quality of light-emitting light sources can be improved. In addition, since there is no need to reduce the pitch interval of the reflective regions, even if the degree of freedom in optical path design or color uniformity is improved, it will not increase the difficulty or cost of the manufacture of the reflective member.

A method of emitting light from a light-emitting light source having a reflective member that reflects light, a light guide portion disposed on the light reflection surface side of the reflective member, and a light-emitting element that projects light onto the light guide portion of the present invention is characterized in that it has : a step of arranging the above-mentioned light-emitting element in the central region of the above-mentioned reflective member; forming a light-emitting surface on the above-mentioned light guide part, so that the light emitted from the above-mentioned light-emitting element and the light of the above-mentioned light-emitting element reflected by the above-mentioned reflective member are emitted to the outside Step; and in the above-mentioned reflective member, a light reflective surface that reflects light emitted from the above-mentioned light-emitting element and reflected by the light-emitting surface of the above-mentioned light guide part is formed by a plurality of reflective regions arranged along at least two directions, by respectively A step of setting the reflection direction of the reflected light generated by each reflection area, and adjusting the emission direction and light intensity distribution of the light emitted from the light emission surface of the light guide part.

In the light emitting method of the light-emitting light source of the present invention, light is reflected by a plurality of reflection areas arranged in at least two directions, and the reflection directions of the reflected light are respectively set, thereby adjusting the amount of light emitted from the light emitting surface of the light guide part. The light emission direction and light intensity distribution, so the direction of the light inside the luminous light source can be carefully set, the degree of freedom in optical path design is improved, and the light emission direction can be adjusted more finely. Therefore, the light intensity distribution of the light emitted from the light emitting source can be made uniform. In addition, in the case of using light-emitting elements with multiple light-emitting colors, color uniformity can be improved, color unevenness can be reduced, and the quality of light-emitting light sources can be improved. In addition, since there is no need to reduce the pitch interval of the reflective regions, even if the degree of freedom in optical path design or color uniformity is improved, it will not increase the difficulty or cost of the manufacture of the reflective member.

The lighting device of the present invention includes a light emitting source array in which a plurality of the first or second light emitting light sources of the present invention are arranged, and a power supply device for supplying power to the light emitting light source array. According to such a lighting device, it is possible to provide a lighting device with uniform light intensity over a large area.

The backlight of the present invention is characterized in that a plurality of first or second light emitting sources of the present invention are arranged on the same plane. According to such a backlight, it is possible to provide a backlight with a large area and uniform light intensity. Furthermore, in the case of color display, color unevenness can be reduced and color uniformity can be improved.

The liquid crystal display device of the present invention includes a light emitting source array in which a plurality of the first or second light emitting light sources of the present invention are arranged, and a liquid crystal display panel arranged to face the array of light emitting sources. According to such a liquid crystal display device, the brightness of the screen can be made uniform. Furthermore, in a liquid crystal display device for color display, color uniformity can be improved.

An embodiment of the liquid crystal display device according to the present invention is characterized in that there is no optical member between the light emitting light source array and the liquid crystal display panel to direct the light emitted from the light emitting light source array toward the front of the liquid crystal display panel. Here, the optical component for directing the light emitted from the light emitting light source array toward the front direction of the liquid crystal display panel refers to, for example, a prism sheet in the embodiment. If the light-emitting source array composed of the light-emitting light source of the present invention is used, the direction of light emitted from the light-emitting source or its diffusion can be adjusted with high precision, so there is no need for optical devices such as prism sheets used in existing liquid crystal display devices or backlights. part. As a result, the thickness of the liquid crystal display device can be reduced, and the mounting cost can be reduced. Furthermore, since the loss of light due to the optical element is eliminated, the utilization efficiency of light can be improved.

Another embodiment of the liquid crystal display device of the present invention is characterized in that there is no optical member for increasing the brightness of light illuminating the liquid crystal display panel between the array of light-emitting light sources and the liquid crystal display panel. Here, the optical member for increasing the luminance of light illuminating the liquid crystal display panel refers to, for example, a luminance-improving film in Examples. When using the light-emitting source array composed of the light-emitting light source of the present invention, the direction of light emitted from the light-emitting source or its diffusion can be adjusted to increase the light intensity, so the brightness-enhancing films used in existing liquid crystal display devices can be unnecessary. optics. As a result, the thickness of the liquid crystal display device can be reduced, and the mounting cost can be reduced. Furthermore, since the loss of light due to the optical element is eliminated, the utilization efficiency of light can be improved.

In addition, the above-described components of the present invention may be combined arbitrarily if possible.

Description of drawings

FIG. 1 is a cross-sectional view showing part of a conventional light-emitting light source.

Fig. 2 is a front view showing a light emitting element and a reflection member without a mold portion in a light emitting light source of a conventional example.

3 is a partial cross-sectional view showing states of light of each color when light-emitting elements of three light-emitting colors of red, green, and blue are arranged at the center of a light-emitting light source of a conventional example.

Fig. 4 is a partial cross-sectional view showing the state of light of each color when the reflection region is divided into smaller parts in the same light-emitting light source.

FIG. 5 is a front view showing a conventional reflection member in which the number of divisions is three.

FIG. 6 is a front view showing a conventional reflection member in which the number of divisions is nine.

7 is a partially cutaway perspective view showing a light emitting light source according to Embodiment 1 of the present invention.

8 is a perspective view showing a state in which the wiring board is removed from the light-emitting light source of the first embodiment, as seen from the back side.

9( a ) and FIG. 9( b ) are a perspective view seen from the front side and a perspective view seen from the back side, showing the mold portion in which the reflection member is formed on the back side.

Fig. 10(a) is a front view showing a mold part having a reflection member formed on the back surface, Fig. 10(b) is a rear view thereof, and Fig. 10(c) is a bottom view thereof.

Fig. 11 (a) is the front view of the luminescent light source of embodiment 1, Fig. 11 (b) is the sectional view along the X-X direction (diagonal direction) of Fig. 11 (a), Fig. 11 (c) is along Fig. 11 ( a) Cross-sectional view in the Y-Y direction (opposite direction).

12 is a cross-sectional view showing the state of light in the light emitting light source of the first embodiment.

FIG. 13 is a front view schematically showing a reflection member used in the light emitting light source of Embodiment 1. FIG.

Fig. 14 is a front view showing a reflection member of Example 1 having a greater number of divisions than the above reflection member.

FIG. 15 is a diagram showing a light intensity distribution in diagonal directions of a light emitting light source of a conventional example.

16 is a diagram showing light intensity distribution in diagonal directions of the light emitting light source according to Embodiment 1 of the present invention.

FIG. 17 is a front view schematically showing a reflection member according to a modification (modification 1) of Embodiment 1 of the present invention, illustrating a distribution method of curved surface shapes of divided reflection regions.

18 is a front view schematically showing a reflection member according to Modification 2 of the present invention, illustrating another distribution method of curved surface shapes of divided reflection regions.

FIG. 19 is a schematic diagram for explaining a method of determining curvature in a reflective member in which each reflective region is a conical surface.

FIG. 20 is a diagram illustrating a method of determining the arrangement of virtual light-emitting elements in various directions or a pitch interval.

FIG. 21 is a diagram illustrating a method of determining the arrangement of virtual light emitting elements in each direction and the pitch interval when there are five light emitting elements.

FIG. 22 is a diagram for explaining a method of determining a conic coefficient in a reflective member in which each reflective area is a conical surface.

FIG. 23 is a diagram illustrating a method of determining the size of the conic coefficient when each reflection area is a conical surface.

Fig. 24(a) is a front view of a light emitting source for explaining a design example, and Fig. 24(b) is a front view in a state where the mold part is removed.

FIG. 25 is a cross-sectional view of the light emitting source in FIG. 24 .

FIG. 26 is a diagram illustrating a method of specifying a control color in a reflection area.

FIG. 27 is a diagram illustrating a method of specifying a control color for specifying a reflective region following the procedure of FIG. 26 .

FIG. 28 is a diagram illustrating a method of specifying a control color for specifying a reflection area following the procedure of FIG. 27 .

FIG. 29 is a diagram illustrating a method of specifying a control color for specifying a reflective region following the procedure in FIG. 28 .

FIG. 30 is a diagram illustrating a method of specifying a control color for specifying a reflection area following the procedure of FIG. 29 .

FIG. 31 is a diagram showing an irradiation light intensity distribution on an irradiation surface due to light emitted from a direct emission region.

FIG. 32 is a diagram showing the distribution of the irradiation light intensity on the irradiation surface by the light emitted from the direct emission region, the distribution of the irradiation light intensity on the irradiation surface of the light reflected by each reflection region, and the overall light intensity distribution.

FIG. 33 is a diagram illustrating another example of a method of specifying a control color for specifying a reflection area.

FIG. 34 is a diagram illustrating a method of specifying a control color for specifying a reflection area following the procedure of FIG. 33 .

FIG. 35 is a diagram illustrating a method of specifying a control color for specifying a reflective region following the procedure in FIG. 34 .

FIG. 36 is a diagram illustrating a method of specifying a control color for specifying a reflection area following the procedure of FIG. 35 .

FIG. 37 is a diagram illustrating a problem caused by the arrangement of control colors in FIG. 33 .

FIG. 38 is a diagram illustrating a method of solving the problem of FIG. 37 .

39( a ) is a front view showing a light-emitting light source according to Modification 3 of the present invention, ( b ) is a cross-sectional view of the light-emitting light source in a diagonal direction, and ( c ) is a cross-sectional view of the light-emitting light source in an opposite-side direction. picture.

40( a ) is a perspective view from the front side of the mold part and the reflection member used in Modification 3, and (b) is a perspective view from the back side thereof.

41( a ) is a front view of a mold portion and a reflection member used in Modification 3, ( b ) is a rear view thereof, ( c ) is a right side view thereof, and ( d ) is a bottom view thereof.

FIG. 42 is a front view schematically showing the structure of a reflection member in Modification 3. FIG.

Fig. 43 is a front view showing the configuration of a reflection member in Modification 4 of the present invention.

Fig. 44 is a front view showing the configuration of a reflection member in Modification 5 of the present invention.

Fig. 45 is a front view showing the configuration of a reflection member in Modification 6 of the present invention.

Fig. 46 is a front view showing the configuration of a reflection member in Modification 7 of the present invention.

Fig. 47 is a front view showing the configuration of a reflection member in Modification 8 of the present invention.

Fig. 48 is a front view showing the configuration of a reflection member in Modification 9 of the present invention.

Fig. 49 is a front view showing the configuration of a reflection member in Modification 10 of the present invention.

FIG. 50 is a front view showing the configuration of a reflection member in Modification 11 of the present invention.

Fig. 51 is a front view showing the structure of a reflection member in Modification 12 of the present invention.

Fig. 52 is a front view showing the configuration of a reflection member in Modification 13 of the present invention.

Fig. 53 is a front view showing the configuration of a reflection member in Modification 14 of the present invention.

Fig. 54 is a front view showing the configuration of a reflection member in Modification 15 of the present invention.

Fig. 55 is a front view showing the configuration of a reflection member in Modification 16 of the present invention.

56 is a partial cross-sectional view showing the cross-sectional shape of the direct emission region in Modification 17 of the present invention.

Fig. 57 is a cross-sectional view showing the state of light in a light-emitting light source according to Modification 17 of the present invention.

Fig. 58 is a front view of a light emitting source in Modification 18 of the present invention.

Fig. 59 is a front view of a light emitting source in Modification 19 of the present invention.

Fig. 60 is a front view of a light emitting source in Modification 20 of the present invention.

Fig. 61 is a front view of a light emitting source in Modification 21 of the present invention.

Fig. 62 is a front view of a light emitting source in Modification 22 of the present invention.

Fig. 63 is a front view of a light emitting source in Modification 23 of the present invention.

Fig. 64 is a front view of a light emitting source in Modification 24 of the present invention.

65( a ) is a diagram showing the state of light on a cross-section in the diagonal direction of the light-emitting light source according to Modification 18 shown in FIG. 58 , and (b) is a diagram showing the state of light on a cross-section in the opposite side direction. picture.

66( a ) is a diagram showing the state of light on a cross-section in the diagonal direction of the light-emitting light source according to Modification 19 shown in FIG. 59 , and (b) is a diagram showing the state of light on a cross-section in the opposite side direction. picture.

Fig. 67 is a front view of a light emitting source in Modification 25 of the present invention.

68( a ) is a perspective view showing the structure of the direct emission region and the total reflection region in the light emitting light source of Modification 25, ( b ) is a cross-sectional view of the light emitting source in the direction opposite to the side, and ( c ) is a schematic representation. A diagram showing the distribution of light to each reflection area of the light emitting source.

Fig. 69(a) is a perspective view showing the structure of the direct emission region and the total reflection region in the luminescent light source of the comparative example, (b) is a cross-sectional view of the luminescent light source in the direction opposite to the side, and (c) is a schematic view showing A diagram of the light distribution state of each reflective area of the light emitting source.

Fig. 70(a) is a perspective view showing the structure of the direct emission region and the total reflection region in the light emitting light source of Modification 26, (b) is a cross-sectional view of the light emitting source in the direction opposite to the side, and (c) is a schematic representation A diagram showing the distribution of light to each reflection area of the light emitting source.

Fig. 71 is a front view of a light emitting source in Modification 27 of the present invention.

Fig. 72 is a front view of a light emitting source in Modification 28 of the present invention.

Fig. 73 is a front view of a light emitting source in Modification 29 of the present invention.

Fig. 74(a) is a cross-sectional view in the direction of the opposite side for explaining the state of light in a light emitting source according to Modification 29, and Fig. 74(b) is a front view thereof.

Fig. 75(a) is a cross-sectional view illustrating the state of light in a light-emitting light source of a comparative example, and (b) is a front view thereof.

FIG. 76 is a cross-sectional view illustrating a state of light in a light-emitting light source according to Modification 29. FIG.

Fig. 77 is a cross-sectional view illustrating a state of light in a light-emitting light source of a comparative example.

Fig. 78 is a front view showing a light-emitting light source array according to Embodiment 2 of the present invention.

Fig. 79 is a schematic cross-sectional view showing the structure of a liquid crystal display according to Example 3 of the present invention.

Fig. 80 is a schematic cross-sectional view showing the structure of a liquid crystal display according to a modified example of Embodiment 3 of the present invention.

Fig. 81 is a perspective view showing a lighting device for indoor lighting using the light-emitting light source array according to Embodiment 4 of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following examples, and may be appropriately changed in design depending on the application.

【Example 1】

FIG. 7 is a partially cutaway perspective view of the light emitting source 21 according to the first embodiment of the present invention. Fig. 8 is a perspective view of a light emitting source from which a wiring board has been removed, viewed from the back side. 9( a ) and ( b ) are a perspective view seen from the front side and a perspective view seen from the back side of the mold part 22 (light guide part) on which the reflective member 26 is formed on the back side. 10( a ) ( b ) ( c ) are a front view, a rear view and a bottom view of the mold part 22 . Fig. 11(a) is a front view of light emitting source 21, Fig. 11(b) is a sectional view along the X-X direction (diagonal direction) of Fig. 11(a), and Fig. 11(c) is a sectional view along Fig. 11(a) Cross-sectional view in Y-Y direction (opposite direction).

In this light emitting light source 21 , a substantially disc-shaped mold portion (light guide portion) 22 is formed of a high refractive index translucent material such as transparent resin. As the translucent material constituting the mold portion 22, translucent resins such as epoxy resins and acrylic resins may be used, or glass materials may be used.

As shown in FIG. 7 , FIG. 10 or FIG. 11 , the shape of the mold portion 22 is rectangular when viewed from the front. A circular direct emission region 29 is provided at the front central portion of the mold part 22 , and a total reflection region 30 is provided on the outer side thereof. The direct emission area 29 is a smooth circular area formed by a plane perpendicular to the central axis of the mold part 22 , and the total reflection area 30 is also a smooth area formed by a plane perpendicular to the central axis of the mold part 22 . Moreover, in the illustrated example, the direct emission region 29 and the total reflection region 30 are formed on the same plane, and the direct emission region 29 is positioned at the same height as the total reflection region 30, but the direct emission region 29 may be formed on the groove 25. The interior is more protruding than the total reflection area 30 , so that the direct exit area 29 is higher than the total reflection area 30 . On the contrary, it is also possible to make the direct emission region 29 retract into the groove 25 more than the total reflection region 30 , so that the direct emission region 29 is lower than the total reflection region 30 . In addition, the direct emission region 29 is a region for directly emitting the light emitted from the light emitting elements 24R, 24G, and 24B to the outside in the original sense, but also has a function of totally reflecting the incident light as described later. Similarly, the total reflection region 30 has the function of totally reflecting the incident light toward the reflective member 26 side in the original sense, but also has the function of transmitting the incident light and emitting it to the outside.

An annular groove 25 is provided between the direct emission region 29 and the total reflection region 30 , and a total reflection region 31 is formed on the bottom surface of the groove 25 with an annular plane. Further, an inclined total reflection area 32 is formed on the inner peripheral side of the groove 25 . The inclined total reflection area 32 is formed in a tapered frustum shape such that its diameter becomes smaller toward the front side of the mold part 22 . Although the total reflection area 31 and the oblique total reflection area 32 also function to totally reflect the incident light in the original sense, part of the incident light may pass through the oblique total reflection area 32 and exit to the outside.

As shown in FIG. 9 , the back surface of the mold part 22 is curved, and a concave mirror-shaped reflection member 26 for reflecting light totally reflected by the front surface of the mold part 22 is provided on the back surface. The reflective member 26 can be a metal film such as Au, Ag, Al, etc. deposited on the back side (pattern surface) of the mold portion 22, can be a white paint coated on the back side of the mold portion 22, or can be mirror-finished on the surface. The metal plate such as aluminum having improved surface reflectance may be a curved plate of metal or resin plated with Au, Ag, Al, etc. on the surface, or may be a curved plate coated with white paint on the surface.

As shown in FIG. 10 , the light reflection surface of the reflection member 26 is formed in a mosaic shape by a plurality of reflection regions arranged in at least two directions when viewed from the light emission direction. Around the opening at the central part of the reflective member 26, a ring-shaped reflective area 36 is provided. In the surrounding area of the reflective area 36, the reflective member 26 is divided into multiple rows and columns, thereby dividing into checkerboard-shaped reflective areas. 28i, 28j, 28k. These reflective regions 28i, 28j, 28k, . . . constitute concentric circular reflective surfaces. Moreover, the light reflection surfaces of the reflection areas 28i, 28j, 28k, ... etc. are mirror surfaces, but the light reflection surfaces of the reflection area 36 may also be made with some rough surfaces to diffuse the light.

Furthermore, as shown in FIG. 9 , an opening is formed in the reflective member 26 at the center portion of the rear surface of the mold portion 22 . In the opening of the reflection member 26, a hemispherical concave portion 27a is formed at the center of the rear surface of the mold portion 22, and an annular convex portion 27b is protrudingly provided around the concave portion 27a.

When assembling this light-emitting light source 21, as shown in FIG. A bracket 34 is fixed to the surface of the wiring board 23 . Next, transparent resin 35 such as thermosetting resin or ultraviolet curable resin is filled in concave portion 27a on the back side of mold portion 22, and this mold portion 22 is supported by bracket 34 fixed on wiring board 23 (shown in FIG. 8 ). The supporting state of the mold part 22 realized by the bracket 34). Then, by curing the transparent resin 35 , the mold portion 22 and the wiring board 23 are integrally bonded by the transparent resin 35 . Further, the light emitting elements 24R, 24G, and 24B are sealed in the transparent resin 35 at a position that is more forward on the optical axis side than the center of the hemispherical surface forming the concave portion 27a.

In addition, the transparent resin 35 may be the same material as that of the mold part 22, or may be a different material. Furthermore, an electronic circuit for adjusting the light intensity of the light emitting elements 24R, 24G, and 24B may be mounted in the space between the wiring board 23 and the mold portion 22 (the space outside the transparent resin 35 ).

The size of the light emitting source 21 is, for example, 30 mm long and 30 mm wide when viewed from the front, and 5 mm thick when viewed laterally, which is thinner than the outer shape. Further, the concave portion 27a on the back surface of the mold portion 22 is formed in a hemispherical shape with a radius of 3.90 mm. However, the concave portion 27a is slightly smaller than 1/2 of the ball, and the radius of the opening portion of the concave portion 27a is 3.25 mm. In addition, the numerical values described here are examples, and these dimensions are appropriately designed as optimal values according to the efficiency of the light-emitting element, the desired amount of light, and the like.

12 is a cross-sectional view showing the structure of the light-emitting light source 21 of the present invention and the state of light emitted from the light-emitting elements 24R, 24G, and 24B, showing a cross-section in a diagonal direction. In addition, in the drawing, light is shown by arrows of thin lines. The reflective regions are, in order from the side closer to the reflective region 36, the reflective region 28s, the reflective region 28t, the reflective region 28u, and the reflective region 28v. When the red, green, and blue light-emitting elements 24R, 24G, and 24B arranged in the center of the light-emitting light source 21 emit light, in the light emitted from the light-emitting elements 24R, 24G, and 24B, the interface of the mold portion 22 The light emitted at the exit angle θ1 (<θc) with a smaller total reflection critical angle θc is incident on the direct emission region 29 , and the light passes through the direct emission region 29 and is directly emitted forward from the light emitting source 21 . In addition, the light emitted at the exit angle θ3 (>θc) larger than the total reflection critical angle θc is incident on the total reflection area 31, and the light is totally reflected by the total reflection area 31, and thus is incident on the reflection area 28s. After being reflected by the reflection area 28s, it passes through the total reflection area 30 and is emitted forward. Moreover, as shown in FIG. 12, when the total reflection region 31 is slightly inclined, the emission angle θ3 may be slightly smaller than the total reflection critical angle θc. In addition, the light emitted at the exit angle θ4 (>θ3) larger than the total reflection critical angle θc is incident on the total reflection area 30, the light is totally reflected by the total reflection area 30, and thus enters the reflection area 28t, and is After being reflected by the reflection area 28t, it passes through the total reflection area 30 and is emitted forward. In addition, the light emitted at an emission angle θ5 (>θ4) larger than the emission angle θ4 or at an emission angle larger than θ5 is totally reflected by the total reflection area 30, and thus enters the reflection area 28u or the reflection area 28v. After being reflected by the reflection areas 28u and 28v, it passes through the total reflection area 30 and is emitted forward. And, the light emitted from the light-emitting elements 24R, 24G, and 24B is incident on the oblique total reflection area 29 at an emission angle θ2 (θ1<θ2<θ3) between the emission angle θ1 to the direct emission region 29 and the emission angle θ3 to the total reflection region 31. The reflection area 32 is incident on the reflection area 36 after being totally reflected twice by the inclined total reflection area 32 and the direct emission area 29 . The light reflected by the reflection area 36 is reflected toward the corner of the light emitting source 21, and then reflected by the total reflection area 30 and the reflection area 28v, thereby being emitted forward from the corner.

Furthermore, in the first embodiment, since the reflective member 26 is formed by arranging the square or rectangular reflective regions 28i, 28j, 28k, . Especially when a white light source is used as the light emitting light source 21, color unevenness and partial coloration can be reduced. This point is described in detail below.

FIG. 13 is a front view schematically showing the reflection member 26 . An opening is provided in the center of the reflective member 26, and the light emitting elements 24R, 24G, and 24B are arranged in the opening. The light reflection surface of the reflection member 26 is divided into a plurality of rows and columns, and reflection regions 28i, 28j, 28k, . . . are arranged in a checkered pattern. In FIG. 13 , in order to simplify the description, the number of divisions of the reflecting members shown is small, and the reflecting members 26 are divided into five rows and five columns. Therefore, the reflective member 26 has 24 reflective regions 28i, 28j, 28k, . . . excluding the opening portion. The reflection regions 28i, 28j, 28k, ... constitute concentric reflection surfaces. By forming the reflective member 26 in a concentric shape in this way, it is possible to further reduce the thickness of the light emitting source 21 . Furthermore, by designing the reflective regions 28i, 28j, 28k, .

The curved surface shapes of the reflection regions 28i, 28j, 28k, . For example, each reflection area 28i, 28j, 28k, ... may be a conical surface represented by the following formula (1).

【Formula 1】

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; CV\&rho;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; cv</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; CC</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; a\&rho;</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; b</span>}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; c\&rho;</span>}}^{\mathrm{<span\; class="notranslate">\; 8</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; d\&rho;</span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

in, $\mathrm{\&rho;}=\sqrt{x^2+{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="A20061000141100811.png,A20061000141100821.png"\; state="\{\{state\}\}">Y</figure-callout>}}^2}$

Here, X, Y, and Z are vertical coordinates whose origin is the center on the reflective member 26 , and the Z axis coincides with the optical axis of the reflective member 26 and the central axis of the mold portion 22 . ρ is the distance (radius) from the origin observed in frontal view (ie, projection onto the XY plane). In addition, CV is the curvature (=1/radius of curvature) of the reflective member 26 or the reflective regions 28i, 28j, 28k, ..., CC is the conic coefficient, A is the displacement of the center of the reflective member 26 to the Z-axis direction, and a, b , c and d are the aspheric coefficients of 4th, 6th, 8th, 10th, ... respectively. However, the values of these coefficients are respectively set for the reflection regions 28i, 28j, 28k, . . .

In the drawings of the description of the present invention, the characteristic quantities (hereinafter referred to as surface constants) representing the curved surface shape of the reflective surface, such as the above-mentioned curvature CV or conic coefficient CC, aspheric surface constant a, b, ... Equal reflective area. In the reflective member 26 shown in FIG. 13, reflective regions having equal distances from the center thereof are designed to have the same surface constant. Furthermore, in the reflection member 26 of FIG. 13, it is assumed that the pitch interval P of the reflection regions 28i, 28j, 28k, . . . is 6 mm.

When comparing the reflection member 26 of FIG. 13 with the reflection member 12 of the conventional example shown in FIG. 5 , the pitch interval P is 6 mm, and the front dimensions of the light emitting sources are also equal. However, in the conventional example of FIG. 5 , the number of divisions of the reflective region does not exceed 3, whereas in the reflection member 26 of FIG. 13 , the number of divisions is 24. In addition, when the reflection regions with the same surface constant (reflection regions with the same distance from the center) are grouped together, there are no more than three types in the conventional example of FIG. , for 5 types. In this way, according to the light-emitting light source 21 of the present embodiment 1, the advancing direction of the light can be set more finely than in the conventional example, and the degree of freedom in the design of the optical path is improved, so that the outgoing direction of the light can be adjusted more finely, and the light can be mixed uniformly. Colored light prevents coloring of the light emitting source 21 . Furthermore, since the number of divisions can be increased without changing the pitch interval P, even if the number of divisions is increased, it does not increase the difficulty of manufacturing or increase the cost.

Furthermore, when the reflection regions 28i, 28j, 28k, . At this time, the pitch interval P of the reflective regions 28i, 28j, 28k, . . . is 2 mm, and the number of divisions of the reflective member 26 is 216. Based on the reflective member 12 of FIG. 5 , in the case of the reflective regions 17a, 17b, 17c, 18a, 18b, . . . of the reflective member 12 of FIG. The interval P is 2 mm, but the number of divisions of the reflection member 12 is only nine. Therefore, the smaller the pitch interval P of the reflective region, or the larger the size of the light-emitting source, the more significant the superiority of the reflective member 26 of Embodiment 1 over the conventional reflective member divided into a ring shape. , It also further improves the freedom of optical path design or color uniformity.

According to the light-emitting light source 21 of the first embodiment, since the light emitted from the light-emitting elements 24R, 24G, and 24B is repeatedly reflected between the total reflection region 30 of the mold part 22 and the reflection member 26, and then emitted forward, it can be used in the light-emitting light source. The inside of 21 obtains the optical path length, and as a result, the intensity of light emitted from light emitting elements 24R, 24G, and 24B and emitted forward from light emitting source 21 can be made uniform. Furthermore, in the case of using the light-emitting elements 24R, 24G, and 24B of plural colors, the degree of color mixing of the light emitted from the light-emitting light source 21 can be increased.

In the light emitting source 21 of the first embodiment, the reflective regions 28i, 28j, 28k, . Finely adjust the outgoing direction of light. In particular, in the light-emitting light source 21 of the first embodiment, as described above, (1) the internal optical path length can be obtained. In addition, (2) the reflection regions 28 i , 28 j , 28 k , . Furthermore, (3) the diffusion of light can be finely designed by the reflective regions 28 i , 28 j , 28 k , . As a result of (1) to (3), the uniformity of light intensity in the light-emitting light source 21 can be improved, and the degree of color mixing can be increased when light-emitting elements of multiple colors are used.

Fig. 15 shows the light intensity distribution in the diagonal direction when the reflective member 12 is divided into concentric light sources in the shape of a belt as shown in Fig. 5 or Fig. 6, and Fig. 16 shows the light intensity distribution in the 13 or FIG. 14 shows the light intensity distribution in the diagonal direction when the reflective member 26 is divided into a checkerboard shape. 15 and 16, the horizontal axis represents the distance in the diagonal direction measured from the center of the reflection member 26, and the vertical axis represents the light intensity at each position. Comparing Fig. 15 and Fig. 16, it can be seen that, in the conventional method, the light intensity varies by about ±15%, but in the case of this embodiment, the light intensity varies by about ±8%, thereby improving the light intensity. uniformity.

Also, in the above-described embodiment, the surface constant is determined according to the distance from the center of the reflection member 26, but the distribution method of the reflection areas having the same surface constant is arbitrary. For example, in Modification 1 shown in FIG. 17 , the distribution in the triangular region (1/8 region of the reflection member 26 ) enclosed by a dotted line in the reflection member 26 is determined, and it is used with respect to two diagonal directions and The distribution in the other areas is determined in a symmetrical manner with respect to the direction of the 2 sides.

In addition, if the light intensity distribution of the light emitting source 21 is designed to be uniform and the uniformity of color is improved, as in the reflection member 26 of Modification 2 shown in FIG. , ... can also be randomly configured, with different surface constants. However, when the reflective regions are randomly arranged, the degree of freedom in design increases, but the color unevenness of the light emitting source 21 increases. That is, as described in FIG. 4 , in order to reduce color unevenness of the light emitting source, it is necessary to arrange the reflection regions that vertically emit light of each color in a predetermined order in consideration of the arrangement order of the light emitting elements. On the other hand, since the light-emitting elements and the reflective regions are arranged in a two-dimensional shape, even if the reflective regions are regularly determined according to each diagonal direction or each opposite side direction, the same color light direction will be generated in the adjacent reflective regions. The area that shoots out vertically in the frontal direction. Therefore, it is necessary to adjust the reflective area so that such an area does not occur.

Next, a method of designing each reflection area will be described. First, a design method when the curvature CV in the above formula (1) is used as a surface constant and changed for each reflection region will be described using FIG. 19 . Here, since three regions adjacent to each other in a diagonal direction or in a direction parallel to a side are treated as a group, only the three adjacent reflection regions are shown in FIG. 19 . Let these three reflective regions be 28R, 28G, and 28B, and their curvatures be CVr, CVg, and CVb, respectively. Here, the reflective region 28R is a reflective region designed to emit the red light emitted from the light emitting element 24R perpendicularly to the front direction, and the reflective region 28G is a reflective region designed to emit the green light emitted from the light emitting element 24G perpendicularly to the front direction. The reflective region 28B is a reflective region designed to emit blue light vertically in the front direction. If, as shown in FIG. 19 , the red light-emitting element 24R, the green light-emitting element 24G, and the blue light-emitting element 24B are sequentially arranged from the left side facing the drawing, then in order to reduce the color unevenness of the light-emitting element 21, it is necessary to The reflective regions are arranged in order from the left of the face to be a reflective region 28B for emitting blue light toward the front direction, a reflective region 28G for emitting green light toward the front direction, and a reflective region 28R for emitting red light toward the front direction (refer to Figure 4). And if the color of the light reflected by the reflective region and emitted vertically to the front direction is called the control color of the reflective region, the reflective region 28R is called the reflective region whose control color is red, and the reflective region 28G is called the control color. is a green reflection region, and the reflection region 28B is called a reflection region whose control color is blue.

The curvature CV of the conical surface can change the forward direction of the light reflected by each reflection area. If the curvature CV is reduced, the light reflected by the reflection area will be inclined to the outside, and if the curvature CV is increased, the light will be reflected by the reflection area. The light is tilted inward. Therefore, considering the pitch interval Q between the light emitting elements 24R, 24G, and 24B, the distance H between the light emitting surfaces of the light emitting elements 24R, 24G, and 24B and the surface of the mold part 22, and the reflective regions 28R, 28G, By designing the curvatures CVr, CVg, and CVb of the adjacent reflective regions 28R, 28G, and 28B based on the positions of the reflective regions 28B, etc., the outgoing directions of light in the reflective regions 28R, 28G, and 28B can be adjusted. Therefore, if the priorities of the control colors of adjacent reflective regions are determined based on the arrangement of the light emitting elements 24R, 24G, and 24B, and the curvatures CVr, CVg, and CVb are designed in consideration of these factors, the area AR of the red light LR can be enlarged. The white light area (the hatched area in FIG. 19 ) in which the area AG of the green light LG and the area AB of the blue light LB overlap can realize uniform white light without color unevenness. For example, in the structure shown in FIG. 19, in the reflective region 28R, the red light LR is emitted vertically to the front side, in the reflective region 28G, the green light LG is emitted perpendicularly to the front side, and in the reflective region 28B, the blue light is emitted vertically. The colored light LB is vertically emitted to the front side, so that the curvature CVg of the central reflection region 28G is used as a reference, so that the curvature CVr of the reflection region 28R near the center is larger than CVg, and the curvature CVb of the reflection region 28B farther from the center is larger than that of CVg. CVg is smaller.

However, when the curvature of the reflection region is determined as described above, the curvature changes depending on the positions of the light emitting elements 24R, 24G, and 24B. In fact, since the light emitting elements 24R, 24G, and 24B are not necessarily arranged in a row, their positions and pitch intervals Q vary with the viewing direction. For example, as shown in Figure 20 (a), in the case of determining the surface constants of the reflective regions 28R, 28G, 28B on the opposite side direction K1, and determining the surface constants of the reflective regions 28R, 28G, 28B on the diagonal direction K2 In the case of , the arrangement of the light emitting elements 24R, 24G, and 24B needs to be handled as a different case.

For example, when considering the reflective regions 28R, 28G, and 28B located in the opposite direction K1 of FIG. 20(a), as shown in FIG. The virtual light-emitting elements 32R, 32G, and 32B obtained on the straight line K1 determine the surface constants of the reflective regions 28R, 28G, and 28B. That is, the surface constant of the reflective region 28R on the opposite direction K1 is determined so that the red light emitted from the virtual light emitting element 32R is emitted perpendicularly to the front direction, and the surface constant of the reflective region 28G on the opposite direction K1 is determined to be emitted from the virtual light emitting element 32R. The green light emitted by 32G is emitted perpendicularly to the front direction, and the surface constant of the reflective region 28B in the opposite direction K1 is set so that the blue light emitted from the dummy light emitting element 32B is emitted perpendicularly to the front direction. Moreover, when considering the reflective regions 28R, 28G, and 28B located in the diagonal direction K2 of FIG. 20( a ), as shown in FIG. 20( b ), it is necessary to use The virtual light emitting elements 33G, 33R, and 33B obtained on the straight line in the direction K2 determine the surface constants of the reflective regions 28R, 28G, and 28B. That is, the surface constant of the reflective region 28R in the diagonal direction K2 is determined so that the red light emitted from the virtual light emitting element 33R is emitted perpendicularly to the front direction, and the surface constant of the reflective region 28G in the diagonal direction K2 is determined to be emitted from the virtual light emitting element 33R. The green light emitted by 33G is emitted perpendicularly to the front direction, and the surface constant of the reflective region 28B in the diagonal direction K2 is determined so that the blue light emitted from the dummy light emitting element 33B is emitted perpendicularly to the front direction.

Furthermore, in the example shown in FIG. 20, since the dummy light emitting elements 32R, 32G, and 32B projected on the straight line in the opposite direction K1 are arranged at equal intervals, and the dummy light emitting elements 32R, 32G, and 32B projected on the straight line in the diagonal direction K2 are also arranged at equal intervals. The light emitting elements 33G, 33R, and 33B make it easy to design each reflection area.

Furthermore, FIG. 21(a)(b) shows the case where five light emitting elements are used. For example, when red, green, and blue light-emitting elements are used, since these light-emitting elements have different luminances, the respective light-emitting elements may be combined in a certain ratio in order to uniformly balance the luminance of each color. For example, in FIG. 21( a ), since the red light emitting element 24R has high brightness, one red light emitting element 24R is used, and two green and blue light emitting elements 24G and 24B are respectively used.

At this time, in the opposite side direction K1, as shown in FIG. 21(b), it can be regarded as being on both sides of the red dummy light emitting element 32R, and the green and blue dummy light emitting elements 32G, 32B are repeatedly arranged on each other. In the same position, the control color and curvature CV of each reflective region can be determined corresponding to the arrangement of such virtual light emitting elements. In the opposite side direction K1, the reflective region 28R is designed corresponding to the red dummy light emitting element 32R, and is designed corresponding to the green and blue dummy light emitting elements 33G, 33B on the facing left side in the opposite side direction K1. The reflective region 28GB adjacent to the reflective region 28R on the peripheral side is designed to correspond to the green and blue dummy light emitting elements 33G, 33B located on the facing right side in the opposite direction K1. The reflective region 28GB adjacent to the reflective region 28R on the outer peripheral side is designed correspondingly .

Moreover, in the diagonal direction K2, as shown in FIG. 21(b), it can be regarded as the middle between the blue virtual light emitting elements 33B, one red virtual light emitting element 33R and two green virtual light emitting elements. Since the elements 33G are repeatedly arranged at the same position, the control color and the curvature CV are determined corresponding to the pairing of such virtual light emitting elements. For example, the reflective region 28RG in the diagonal direction K2 is designed corresponding to the red and green virtual light emitting elements 33R and 33G, and the inner peripheral side is designed corresponding to the virtual light emitting element 24B on the upper left side in the diagonal direction K2. The reflective region 28B adjacent to the region 28RG is designed to be adjacent to the reflective region 28RG on the outer peripheral side corresponding to the dummy light emitting element 24B located on the lower right side in the diagonal direction K2.

Similarly, in the diagonal direction K3, as shown in Figure 21(b), it can be regarded as the middle between the green virtual light emitting elements 33G, one red virtual light emitting element 33R and two blue virtual light emitting elements Since the elements 33B are repeatedly arranged at the same position, the control color and the curvature CV are determined corresponding to the positions of such virtual light emitting elements. For example, the reflective region 28RB in the diagonal direction K3 is designed corresponding to the red and blue virtual light emitting elements 33R and 33B, and the inner peripheral side is designed corresponding to the virtual light emitting element 33G on the lower left side in the diagonal direction K3. The reflective region 28G adjacent to the reflective region 28RB is designed to be adjacent to the reflective region 28RB on the outer peripheral side corresponding to the dummy light emitting element 33G located on the upper right side in the diagonal direction K3.

Next, a design method in which the conic coefficient CC in the above-mentioned formula (1) is changed for each reflection area as the surface constant will be described. The conic coefficient CC can change the diffusion degree of the light reflected by the reflection area. If the conic coefficient CC is reduced, the diffusion degree of the light reflected by the reflection area becomes larger. If the conic coefficient CC is increased, the reflection The degree of diffusion of light reflected by the area is reduced. Therefore, when designing the conic coefficient CC, the distance D1, D2 and so on determine the conic coefficient CC so that the brightness or the degree of color mixing of the light emitted from each area of the light emitting source 21 becomes uniform.

Specifically, as shown in FIG. 22 , the conical coefficient CC can be reduced in the reflective regions 28R, 28G, and 28B whose distance D1 from the light-emitting elements 24R, 24G, and 24B is short, and the conic coefficient CC can be reduced in relation to the light-emitting elements 24R, 24G, and 24B. In the reflective regions 128R, 128G, and 128B where the distance D2 between 24B is long, the conic coefficient CC is increased. As a result, in the reflective regions 28R, 28G, and 28B near the light-emitting elements 24R, 24G, and 24B, the diffusion of emitted light increases, and broad directivity is obtained. In the reflective areas 28R, 28G, and 28B near the light-emitting elements 24R, 24G, and 24B, although the amount of light arriving is large, the optical path length is short, so the light of each color is difficult to mix, but by reducing the conic constant CC, the reflected light can be expanded. Directivity, while dispersing light and suppressing brightness, the degree of color mixing can be improved. On the other hand, in the reflective regions 128R, 128G, 128B far from the light-emitting elements 24R, 24G, 24B, although the optical path length is long to form color mixture, on the other hand, the amount of light reaching is small, but by increasing the cone coefficient CC To narrow the directivity of reflected light, even if the degree of color mixing is somewhat sacrificed, the dispersion of light is reduced and the brightness is improved. Therefore, according to this design method, the uniformity of light intensity can be realized on the whole of the light source 21 , and the degree of color mixing can be balanced on the whole of the light source 21 to achieve color uniformity. However, it does not mean that this design method is the best, because the purpose is to achieve the best light intensity and color mixing degree on the irradiated surface (target surface) designed to be fixed on the design in front of the light source, so the target surface The intensity of light and the degree of color mixing are designed to achieve the best results, and the diffusion of light in the reflection area near the light-emitting element may also be narrowed.

On the other hand, when the reflection regions 28i, 28j, 28k, . Therefore, when designing the reflective regions 28i, 28j, 28k, . In this way, after determining the surface coefficient CC of the reflective area located in the diagonal direction K2 or the opposite side direction K1, as shown by the solid arrow in FIG. The conic coefficient CC of each reflection area is determined in such a way that the area and the conic coefficient CC are larger. Then, the surface constants of the reflection regions adjacent to these reflection regions are designed. At this time, as shown by the dotted arrow in FIG. 23 , the conic coefficient CC can be made larger as the direction from the opposite side tends to the diagonal direction.

Next, a method of concretely designing the reflective member 26 based on the above-mentioned principle will be described. Fig. 24 (a) (b) is a front view of a light emitting source 21 in which a red light emitting element 24R, a green light emitting element 24G, and a blue light emitting element 24B are respectively arranged in the central part, and the mold part is removed. 22 after the front view, Figure 25 is a cross-sectional view on its diagonal direction. The outer dimensions viewed from the front of the light emitting source 21 are 30 mm in length and width. The reflective member 26 is divided 15 times in the vertical and horizontal directions to form mesh-like reflective regions 28a, 28b, . . . , each of which is 2mm in the vertical and lateral directions. The light emitting elements 24R, 24G, and 24B are arranged in a triangle. The red light emitting element 24R and the blue light emitting element 24B are arranged in a direction parallel to the upper and lower sides of the reflective member 26, and arranged on the left and right sides of the face. The green light emitting element 24G is configured on the upper side. Furthermore, the diameter of the direct emission region 29 is 5 mm, the inner diameter (diameter) of the bottom surface of the groove 25 is 5.5 mm, the outer diameter (diameter) of the upper surface of the groove 25 is 10 mm, and the depth of the groove 25 is 1.8 mm.

First, the procedure for determining the control color for each of the reflective regions 28a, 28b, . . . will be described. Initially, the arrangement of the control colors in the four diagonal directions K2, K3, K5, K6 and the four opposite directions K1, K4, K7, K8 is determined. Since the configuration of the light emitting elements 24R, 24G, and 24B is the same as that shown in FIG. 20 , it can be seen from the description related to FIG. 20 that in the diagonal directions K2 and K6, dummy light emitting elements are arranged from the upper left side to the lower right side. 33G, 33R, 33B. In this way, in the diagonal direction K2 on the upper left side of the face, from the inner side to the outer side, the order of the control colors is green (G), red (R), blue (B), and in the diagonal direction K6 on the lower right side, from From inside to outside, the sequence of control colors is blue (B), red (R), green (G).

In the diagonal directions K3, K5, the dummy light emitting elements 33R, 33B, 33G are arranged from the lower left side to the upper right side, so in the diagonal direction K3 on the lower left side facing the face, from the inner side to the outer side, the order of the control colors is red ( R), blue (B), green (G), on the upper right diagonal direction K5, from the inner side to the outer side, the order of the control colors is green (G), blue (B), red (R).

Moreover, in the horizontal direction, the dummy light-emitting elements 32R, 32G, and 32B are arranged from the left side to the right side. Therefore, in the horizontal direction K1 on the left side facing the face, the order of the control colors is red from the inside to the outside. (R), green (G), blue (B), on the horizontal direction K4 on the right side, from the inner side to the outer side, the order of the control colors is blue (B), green (G), red (R) .

In addition, in the vertical direction, one red dummy light emitting element 32R and one blue dummy light emitting element 32B are repeatedly arranged at the same position, and a green dummy light emitting element 32G is arranged adjacent thereto. On the vertically opposite side direction K7 on the upper side, from the inside to the outside, the control colors are green (G), red and blue (RB), and on the downside vertically opposite side direction K8, from the inside to the outside, the control colors are For red and blue (RB), green (G). FIG. 26 shows a state in which the order of the control colors in the respective directions K1 to K8 is determined in this way.

As mentioned above, after determining the order of the control colors in each direction K1-K8, as shown in FIG. 27, first determine the control colors of each reflective area in one direction such as the upper left diagonal direction K2. For example, if the control color of the reflective area in the upper left corner is arbitrarily determined, the control color in the diagonal direction K2 is uniquely determined.

Next, starting from the arrangement of the control colors in the diagonal direction K2, the control colors of the reflection areas located on the outer periphery of the reflection member 26 are determined without making the control colors of the reflection areas adjacent up, down, left, and right the same. At this time, in each of the directions K1, K3 to K8 other than K2, the order of the control colors determined as described above is not changed, but only the positions are shifted in each of the directions K1, K3 to K8. FIG. 27 shows a state in which the control color of the outer peripheral portion is determined in this way.

And, as shown in FIG. 28, based on the control color of each reflection area on the direction K1, K2, K4, K5, K7 and the control color of each reflection area of the outer periphery, in the area of the upper half of the reflection member 26, The control colors of the blank reflection areas are determined without making the control colors of the reflection areas adjacent up, down, left, and right the same.

At this time, in the distribution state of the control colors shown in FIG. 28 , in the α portion, the green control color is adjacent to the left and right. In such a case where the control colors of the same color are continuous up, down, left, and right, try to replace the control color at that position, and adjust so that the control colors of the adjacent reflection areas are different. Fig. 29 replaces the control colors of red, green, and blue one by one in the α portion of Fig. 28 and its vicinity, making it discontinuous.

Next, as shown in FIG. 30 , the control color of the reflective area in the lower half is determined so as to form line symmetry with the control color of the reflective area in the upper half with respect to the horizontal direction K1 - K4 . The order of the control colors of the reflective area in the lower half determined through such line symmetry operation is consistent with the order of the initially determined control colors. At this time, there is no problem when the number of reflective regions arranged vertically is an odd number, but when the number of reflective regions arranged vertically is an even number, the control colors between the reflective regions adjacent up and down in the horizontal direction in the upper and lower central portions are the same. . Therefore, in this case, it is necessary to try to replace the control color at this point so that the control colors of the adjacent reflection regions are different. Therefore, it is preferable to arrange an odd number of reflective regions.

In addition, when the above-mentioned symmetric operation is not desired, the control color of the reflection area of the lower half is determined separately in the same way as the control color of the reflection area of the upper half is determined, and between the upper half and the lower half, It is also possible to adjust when the control color of the same color is consecutive up, down, left, and right. After the control color has been determined for the entire reflective member 26 in this way, the control color allocation operation is completed.

Furthermore, depending on the number of divisions and the shape of the reflective areas, the control colors may be the same between the reflective areas adjacent up, down, left, and right no matter how the distribution of the control colors is adjusted. In such a case, it is necessary to preferentially prevent the control colors at positions far from the light emitting elements from overlapping, and to make the same control colors adjacent to each other in the reflection region near the light emitting elements. As mentioned above, since the reflective area close to the light-emitting element is controlled to diffuse reflected light and hardly affect the color mixing property of the light-emitting light source 21, it is possible to perform wrinkling near the light-emitting element.

After the control color of each reflective area is determined in this way, the constant, especially the curvature CV of each reflective area can be designed so that the light of this color is emitted vertically toward the front direction. However, the reflective area whose control color is red and blue (RB) refers to a design that in a certain direction, the red and blue light emitted from the red and blue virtual light emitting elements 32R and 32B located at the same position are directed toward the front side. A reflective area where the direction shoots out perpendicularly.

After determining the control color of each reflection area in this way, the curvature or shape of each reflection area is determined according to the control color so that light is emitted in the front direction. Specifically, when the reflective region is formed of a conical surface, the conic coefficient CC or the curvature CV can be determined as its parameter.

First, it is considered that the conic coefficient CC is determined so that light is uniformly emitted from the light emitting source 21 as a whole. The light emitted from the light emitting source 21 can be divided into light emitted directly from the light emitting elements 24R, 24G, and 24B and light emitted after being reflected by the reflection member 26 . Therefore, it is necessary to know the light quantity distribution of the light directly emitted from the light emitting elements 24R, 24G, and 24B. As shown in FIG. 12 , this is the light emitted from the direct emission region 29 .

FIG. 31 shows the distribution of the amount of irradiated light by the light emitted from the direct emission region 29 of the light emitting light source 21 . This amount of irradiation light is the amount of irradiation light on the irradiation surface (target surface) located at a distance of 20 mm from the front surface of the light emitting source 21 . 31 represents the distance measured diagonally from the center of the light emitting source 21, and the vertical axis represents the relative value of the amount of irradiated light, which is normalized so that its maximum value is 1. Furthermore, a curve C29 in FIG. 32 is a partially enlarged display of the light intensity distribution in FIG. 31 . Therefore, if considering the diagonal direction of light emitting source 21 such as FIG. 24 and FIG. The irradiation light intensity of the light emitted from the areas 28a, 28b, 28c, 28d, and 28e in the front direction complements the irradiation light intensity distribution of the light emitted from the direct emission area 29 on the target surface, and a substantially uniform light intensity distribution is obtained as a whole.

For example, for the irradiation light intensity distribution of the light emitted from the direct emission area 29 shown in FIG. For the distributions represented by C28a, C28b, C28c, C28d, and C28e, the overall irradiation light quantity distribution Ctotal becomes a substantially uniform light quantity distribution. However, when a plurality of light-emitting sources 21 are arranged at the end of the light-emitting source 21, the light of four adjacent light-emitting elements 21 overlaps, so the amount of light at the end of a single light-emitting source 21 can be small.

Therefore, when the light intensity distribution of the light emitted from the direct emission region 29 is the distribution shown in FIG. 31, as shown in FIG. The peak value of the light intensity may be 1 time, 1.8 times, 2 times, 2 times, or 1 time the peak value of the light emitted from the direct emission region 29 . The amount of light incident on the reflective regions 28a, 28b, 28c, 28d, and 28e decreases sharply as the distance from the center decreases. Therefore, when calculating the conic coefficient CC of the reflective regions 28a, 28b, 28c, 28d, and 28e in consideration of this point, Each conical coefficient CC is -5, -2, -1.5, -1, -1 in sequence.

After obtaining the conic coefficient CC of each reflective area 28a, 28b, 28c, 28d, 28e in this way, the curvature CV of each reflective area 28a, 28b, 28c, 28d, 28e is obtained from the obtained control color, and adjusted to each The light of the control color is emitted from the reflective regions 28a, 28b, 28c, 28d, and 28e in the front direction to improve the color mixing property on the target surface of the light emitting source 21 and ensure color uniformity. Specifically, the curvature CVs of the reflection regions 28a, 28b, 28c, 28d, and 28e are 1/5, 1/29, 1/28, 1/31, and 1/31 in this order. In this way, after obtaining the conic coefficient CC or curvature CV of each reflective area 28a, 28b, 28c, 28d, 28e in the diagonal direction, obtain the conic coefficient CC or curvature CV of the remaining reflective areas in the same manner, and determine each The shape of the reflection area. The light intensity distribution shown in FIG. 16 shows the distribution of the irradiated light quantity on the target surface of the light emitting light source 21 whose surface constant is determined in this way.

Furthermore, as another example, it is considered that a red light emitting element 24R is disposed in the center, a green light emitting element 24G is disposed on both sides in one diagonal direction K2, K6, and a green light emitting element 24G is disposed on both sides in the other diagonal direction K3, K5. A light-emitting light source as shown in FIG. 33 in which blue light-emitting elements 24B are arranged on both sides. This arrangement of light emitting elements is basically the same as the arrangement shown in FIG. 21 , and the number of vertical and horizontal arrangements of the reflection regions 28R, 28G, and 28B is also 15 in the same manner. At this time, it can also be known from the description related to FIG. 21 that in the diagonal direction K2 on the upper left side and the diagonal direction K6 on the lower right side, the control color is the mixed color (RB) of green (G) and red/blue , in the diagonal direction K3 on the lower left side and the diagonal direction K5 on the upper right side, the control colors are blue (B) and red/green mixed color (RG), and in the horizontal directions K1, K4 are red (R) and The mixed color (GB) of green/blue is also the mixed color (GB) of red (R) and green/blue on the vertical direction K7, K8.

Therefore, in this case, as shown in FIG. 33 , in the diagonal direction K2 on the upper left side and the diagonal direction K6 on the lower right side, green (G) and a mixed color of red/blue (RB) are alternately assigned as control. color. In the diagonal direction K3 on the lower left side and the diagonal direction K5 on the upper right side, blue (B) and a mixed color of red/green (RG) are allocated alternately as control colors. In the horizontal directions K1 , K4 , red (R) and green/blue mixed colors (GB) are allocated alternately as control colors. Also, in the vertical directions K7, K8, red (R) and green/blue mixed color (GB) are allocated alternately as control colors.

However, in any of the diagonal, horizontal, and vertical directions, the control colors at both ends of the three control colors are also the same, so if they are arranged repeatedly, the diagonal, horizontal, or vertical In the direction, the control colors of the same color are continuous, resulting in uneven color. For example, considering the diagonal direction K2, the two green dummy light emitting elements 33G are divided into dummy light emitting element 33G(1) and dummy light emitting element 33G(2). In addition, if the control color of the virtual light emitting element 33G(1) is G(1) and the control color of the virtual light emitting element 33G(2) is G(2), the arrangement of the control colors in the diagonal direction K2 As shown in Figure 37. At this time, it can be seen from the emitted light rays from the respective virtual light emitting elements 33G(1), 33R, 33B, and 33G(2) shown in FIG. Uneven color.

Therefore, in such a case, as shown in FIG. 38 , it is preferable to emit light from only one dummy light emitting element (the dummy light emitting element on the side closer to the reflection region) toward the front. For example, in the diagonal direction K2, only the control color of the green dummy light emitting element 33G(1) and the control colors of the red/blue dummy light emitting elements 33R, 33B that are close to the reflection area in the diagonal direction K2 are alternately arranged. , without using the control color of the dummy light emitting element 33G(2). In this way, it can also be seen from the ray diagram of FIG. 38 that a uniform light distribution without color unevenness can be obtained.

Therefore, after the control colors in each direction are determined, for repeated control colors, only the control colors of the virtual light-emitting elements on the side near the corresponding reflection area are considered, so that the control colors of the same color are discontinuous. Thereby, as shown in FIG. 34, on the diagonal directions K2, K6 on the upper left side and the lower right side, the control color of green (G) and the control color of red/blue (RB) are arranged alternately, and on the lower left side and the upper right side The blue control color (B) and the red/green control color (RG) are alternately arranged in the diagonal directions K3 and K5. Also, in the horizontal directions K1, K4 and vertical directions K7, K8, the control color of red (R) and the control color of green/blue (GB) are alternately arranged. However, the control color G in the diagonal direction K2 is based on the virtual light emitting element 33G (24G) located on the upper left side, and the control color G in the diagonal direction K6 is based on the virtual light emitting element 33G (24G) located on the lower right side . The same applies to other directions.

After determining the respective control colors in the reflective regions in the diagonal, horizontal and vertical directions in this way, as shown in FIG. When determining the control color, six control colors of the same color are applied discontinuously up, down, left, and right, and the control color of each reflection area is tentatively determined.

Moreover, in the area where the surrounding control color has been determined (for example, the area between the diagonal directions K2 and K3), the control color is applied to the blank reflection area, so that the control color of the same color is discontinuous in the upper, lower, left, and right sides, as shown in the figure 35, for example, determine the control color on about 1/4 of the area. After that, the determined control color is transferred to the remaining area symmetrically with respect to the diagonal line, and as shown in FIG. 36 , the control color is allocated to the whole.

After determining the control color of each reflective area in this way, similar to the case of three light emitting elements, surface constants such as conic coefficient CC and curvature CV can be determined so that uniform light is emitted in the front direction.

In the above-mentioned embodiment, the quadrangular reflective member 26 is divided into a plurality of quadrangular reflective regions 28i, 28j, 28k, . . . 39 to 42 show modification 3 of the light emitting source 21, which is an example in which the hexagonal reflective member 26 viewed from the front is divided into hexagonal reflective regions 28i, 28j, 28k, . . . . FIG. 39( a ) is a front view of a light-emitting light source according to Modification 3. FIG. Fig. 39(b)(c) are respectively the cross-sectional view in the diagonal direction and the cross-sectional view in the opposite direction of the corresponding light emitting source. 40( a ) and ( b ) are a perspective view seen from the front side and a perspective view seen from the back side of the mold part 22 formed with the reflection member 26 on the back side, respectively. And, Fig. 41(a) is a front view of the mold part, Fig. 41(b) is a rear view thereof, Fig. 41(c) is a right side view thereof, and Fig. 41(d) is a bottom view thereof. Furthermore, FIG. 42 is a front view schematically showing the reflective member 26 used in this light-emitting light source. The light emitting source 21 is hexagonal when viewed from the front, and the reflection member 26 is also hexagonal. Furthermore, the hexagonal reflection member 26 is divided into a plurality of hexagonal reflection regions 28i, 28j, 28k, . . . without gaps.

In the reflective regions 28i, 28j, 28k, ... of the shape of Modification 3, the reflective regions are continuous in the opposite direction K9-K9 shown in FIG. 42, but in the diagonal direction K10 shown in FIG. - On K10, reflective areas are discrete (in a part, through borders between reflective areas). In such a case, the respective surface constants, such as the curvature CV or the conic coefficient CC, can be designed first for the reflective regions arranged along the opposite side direction, and then the surface constants can be sequentially determined for the reflective regions adjacent to the reflective regions. In addition, since a portion of the reflective region located at the edge of the reflective member 26 is cut away to form a trapezoid, the effective area becomes small. In the reflective area of the hexagonal notched edge, design can be performed assuming that the reflective shape of the edge is hexagonal at first, and a larger value than the conic coefficient determined as the hexagonal shape can be assigned to the hexagonal notched reflective area. When the external shape of the reflective member 26 is the same as that of the reflective regions 28i, 28j, 28k, .

FIG. 43 is a front view showing the configuration of a reflection member 26 in Modification 4. FIG. On this reflective member 26, the triangular reflective member 26 is divided into a plurality of triangular reflective regions 28i, 28j, 28k, . . . . At this time, if considering the reflection area on the line segment K11-K11 connecting the vertex and the center of the side shown in Figure 43, the reflection area located on the outermost side (that is, the reflection area located at the vertex and the reflection area located at the center of the side) ) at different distances from the center. Therefore, in this modified example, instead of sequentially designing the reflection areas on the line segment K11-K11, the design starts from the reflection area 28h at the vertex. That is, if the conic coefficients and the like are first designed for the reflective regions 28h located at the three vertices, and the reflective regions 28h located at the vertices are used as a starting point, the adjacent reflective regions are sequentially designed and pushed inward, then it is easy to adjust the curvature CV, the conic coefficient CC, etc. The surface constants are adjusted.

44, 45, and 46 show modifications in which the reflection member 26 is divided into reflection regions 28i, 28j, 28k, . . . of shapes different from the outer shape. Modification 5 shown in FIG. 44 and Modification 6 shown in FIG. 45 are modification examples in which the quadrangular reflection member 26 is divided into a plurality of triangular reflection regions 28i, 28j, 28k, . . . Example 7 is a modified example in which the hexagonal reflection member 26 is divided into a plurality of triangular reflection regions 28i, 28j, 28k, . . . . According to these modified examples 5 to 7, the reflection regions 28i, 28j, 28k, . . . can be further subdivided. On the other hand, since the directions of the reflection regions of the light emitted radially from the light emitting elements 24R, 24G, and 24B are scattered, it is difficult to design the respective reflection regions. Therefore, in the case of these modified examples, it is preferable to design as follows.

In the modification examples 5 and 6 of FIG. 44 and FIG. 45 in which the quadrangular reflective member 26 is divided into triangular reflective regions 28i, 28j, 28k, . However, in the diagonal direction K13-K13, the reflective areas are arranged continuously. Therefore, in this case, surface constants such as conic coefficients can be designed first for the reflective regions arranged in the diagonal direction K12-K12, and then the reflective regions adjacent to the corresponding reflective regions can be sequentially designed.

Furthermore, in Modification 7 of FIG. 46 in which the hexagonal reflective member 26 is divided into a plurality of triangular reflective regions 28i, 28j, 28k, . However, in the opposite side direction K15-K15, the reflective areas are arranged continuously. Therefore, in this case, surface constants such as conic coefficients can be designed first for the reflective regions arranged in the opposite direction K15-K15, and then the reflective regions adjacent to the corresponding reflective regions can be sequentially designed.

In addition, FIGS. 47 to 49 are modification examples in which the reflective member 26 is divided into concentric belts around the light-emitting elements 24R, 24G, and 24B, and then the belt-shaped area is divided into multiple pieces along the circumferential direction. That is, in the reflection member 26 of Modification 8 shown in FIG. 47 , the quadrangular reflection member 26 is divided into a belt shape and a radial shape to form a plurality of reflection regions 28i, 28j, 28k, . . . . In the reflective member 26 of Modification 9 shown in FIG. 48 , the hexagonal reflective member 26 is divided concentrically and radially to form a plurality of reflective regions 28i, 28j, 28k, . . . . In the reflective member 26 of the tenth embodiment shown in FIG. 49 , the triangular reflective member 26 is divided concentrically and radially to form a plurality of reflective regions 28i, 28j, 28k, . . . Furthermore, as in Modification 11 shown in FIG. 50 , it is also possible to shift the reflection areas in the respective directions in the radial direction.

In these modified examples 8 to 11, since the size of the reflective region near the central portion becomes smaller, it becomes difficult to create the reflective region near the central portion. Therefore, the number of divisions can be increased in the outer orbicular region, and the number of divisions in the reflection region closer to the center can be reduced. In these modified examples, since the light emitted radially from the light emitting elements 24R, 24G, and 24B can be arranged in the same radial pattern in all directions, the design of the reflection member 26 and the adjustment of the surface constant are facilitated.

51 and 52 are modification examples in which reflective regions 28i, 28j, 28k, . Modification 12 shown in FIG. 51 is an example in which a quadrangular reflective member 26 is divided into quadrangular (ie, rhombus) reflective regions 28i, 28j, 28k, . . . rotated by 45°. Modification 13 shown in FIG. 52 is an example in which the hexagonal reflection member 26 is divided into hexagonal reflection regions 28i, 28j, 28k, . . . rotated by 30° or 90°. In these modification examples 12 and 13, since the reflection regions are continuous in the diagonal direction where the amount of light tends to be insufficient, the design of the reflection regions becomes easy. However, since many reflective regions in a partially cut-out shape are likely to occur in the peripheral portion, light loss is likely to occur. In such a modified example, since the reflection regions are continuous in the diagonal direction, it is easy to design the reflection regions arranged in the diagonal direction. Furthermore, by designing the reflection areas in order from the reflection areas adjacent to the reflection areas in the diagonal direction, the design of the reflection member 26 and the adjustment of the surface constant can be easily performed.

53 to 55 are modification examples in which reflective regions 28i, 28j, 28k, . . . , 28x, 28y, 28z, . That is, in Modification 14 shown in FIG. 53 , square reflection regions 28i, 28j, 28k, . . . , 28x, 28y, 28z, . The larger the size. If such a reflective member 26 is to be designed, the whole reflective member 26 is divided according to the largest reflective area, and the outermost reflective area is successively divided into 1 part (that is, no division), 2 parts, 3 parts, …

Furthermore, in Modification 15 shown in FIG. 54 , hexagonal reflection regions 28i, 28j, 28k, . . . , 28x, 28y, 28z, . , the reflective regions 28i, 28j, 28k, . . . , 28x, 28y, 28z, . . . are larger in size. At this time, the whole hexagonal reflective member 26 may be uniformly divided first according to the largest hexagonal reflective region, and then the inside of the largest reflective region may be divided.

In Modification 16 shown in FIG. 55 , triangular reflecting regions 28i, 28j, 28k, . . . , 28x, 28y, 28z, . , 28j, 28k, ..., 28x, 28y, 28z, ... the larger the size. According to this modified example, the degree of freedom of design increases, and the uniformity of light intensity and color improves. At this time, the entire triangular reflective member 26 may be evenly divided according to the largest triangular reflective region first, and then the interior of the largest reflective region may be divided.

In Modifications 14 to 16 as shown in FIGS. 53 to 55 , it is possible to first divide the reflection member 26 into reflection regions of the same size to design each surface constant, and then divide each reflection region to fine-tune the curved surface shape of the divided reflection regions. , so the design of the reflection member 26 is easy. Moreover, in such a modified example, since the amount of light emitted from the light emitting elements 24R, 24G, and 24B is large, the degree of freedom in design increases and the uniformity of light intensity improves, but on the other hand, because the light emitting area near the center portion Since it becomes tiny, it becomes difficult to create a light-emitting region near the center.

Furthermore, the shape of the mold part 22 can also be changed in various designs. For example, in Modification 17 shown in FIG. 56 , the direct emission region 29 is formed as a curved surface such as a conical shape, a truncated conical shape, or a spherical shape. If the direct emission region 29 is formed into such a curved surface, the reflection direction of the light totally reflected by the inclined total reflection region 32 and incident on the direct emission region 29 can be adjusted according to its inclination angle or curvature, thereby improving the performance of the reflection member 26. design freedom.

FIG. 57 is a cross-sectional view in the diagonal direction for explaining the state of light in Modification 17 in which the direct emission region 29 is formed in a conical shape. If the direct emission region 29 is formed into a conical shape in this way and the direct emission region 29 has an appropriate inclination angle, as shown in FIG. 57 , the lights emitted from the direct emission region 29 can be made substantially parallel to each other.

Various design changes can also be made in the front shape of the mold part 22 or the groove 25 . For example, in Modification 18 shown in FIG. 58 , an annular groove 25 and a circular direct emission region 29 are formed in a light emitting source 21 having a square shape. Furthermore, in Modification 19 shown in FIG. 59 , a square annular groove 25 and a square direct emission region 29 are formed in a square light source. In Modification 20 shown in FIG. 60 , a hexagonal annular groove 25 and a hexagonal direct emission region 29 are formed in a light emitting source having a hexagonal outer shape. In Modification 21 shown in FIG. 61 , a triangular annular groove 25 and a triangular direct emission region 29 are formed in a triangular-shaped light emitting source.

In Modification 18 as shown in FIG. 58 , the direct emission region 29 can be designed corresponding to the light emitted radially from the light emitting source 21 arranged at the center, so the design of the direct emission region 29 is easy. Furthermore, in Modifications 19 to 21 such as FIGS. 59 to 61 , the degree of freedom in design increases, and the uniformity of light intensity and color improves.

Furthermore, in Modification 22 shown in FIG. 62 , a square-shaped light source 21 is provided with a square-shaped groove 25 , and a circular direct emission region 29 is provided at the center thereof. In Modification 23 of FIG. 63 , a hexagonal groove 25 is provided in a light emitting source having a hexagonal shape, and a circular direct emission region 29 is provided at the center thereof. In Modification 24 shown in FIG. 64 , a triangular shaped groove 25 is provided in a triangular shaped light source 21 , and a circular direct emission region 29 is provided at the center thereof.

58 and FIG. 59, the modified examples in which the outer peripheral shape of the groove 25 corresponds to the outer shape of the light emitting source 21 and the direct emission region 29 is circular will be described as shown in FIGS. 62 to 64. The advantages of 22-24. Fig. 65 (a) (b) has shown the modified example 18 of Fig. 58 that the annular groove 25 of certain width is set, and Fig. 65 (a) has shown its section on the diagonal direction, and Fig. 65 (b) has shown its Sections across sides. As shown in Figure 65 (a) (b), the length of each reflective region 28p, 28q, 28r, ... on the cross section in the direction of the opposite side is greater than the length of each reflective region 28s, 28t, 28u, ... on the cross section in the diagonal direction. The length is shorter, and each reflective area 28p, 28q, 28r, ... is more biased towards the center side in the opposite side direction than in the diagonal direction. Therefore, for example, as shown in FIG. 65( a ), on a cross section in a diagonal direction, even if it is designed to emit from the light emitting elements 24R, 24G, and 24B, the light reflected by the total reflection region 31 on the bottom side of the groove 25 enters from the inside. On the whole of the second reflection area 28s, on the cross-section in the direction of the opposite side shown in FIG. 65(b), the light reflected by the total reflection area 31 not only enters the second reflection area 28p from the inside, but also It is incident on the third reflective area 28q. Therefore, the light reflected by the total reflection area 31 is also received in the reflection area 28q, and the design of the reflection area 28q becomes complicated.

On the other hand, Fig. 66(a)(b) shows the modified example 19 of Fig. 59 in which a groove 25 of a certain width forming a quadrangular annular shape corresponding to the shape of the light emitting source 21 is provided, and Fig. 66(a) shows The cross section in the diagonal direction thereof, Fig. 66(b) shows the cross section in the opposite side direction. At this time, the lengths of the reflective regions 28p, 28q, 28r, ... on the cross section in the opposite direction are also shorter than the lengths of the reflective regions 28s, 28t, 28u, ... on the cross section in the diagonal direction. The reflective regions 28p, 28q, 28r, . However, in Figure 58 and Figure 65 (a) (b) in the case of modification 18, the position of the groove 25 does not depend on the cross-sectional direction, but is constant, in contrast to this, in Figure 59 and Figure 66 (a) ( In the case of Modification 19 of b), the position of the groove 25 is shifted to the center side in the cross section in the opposite direction than in the cross section in the diagonal direction. Therefore, it can be designed so that the light emitted from the light-emitting elements 24R, 24G, and 24B and reflected by the total reflection region 31 on the bottom side of the groove 25 enters the first light from the inside on the cross-section in the diagonal direction shown in FIG. 66(a). The light reflected by the total reflection area 31 can also be designed so that the light reflected by the total reflection area 31 enters the entire second reflection area 28p from the inside on the entirety of the two reflection areas 28s, and on the cross-section in the direction opposite to that shown in FIG. 66(b). Therefore, according to such modification 19, the design of the reflection area becomes easy. However, in such modification 19, there is a disadvantage that since the direct emission region 29 is square, the light emitted radially from the light emitting elements 24R, 24G, and 24B is reflected or transmitted by the square direct emission region 29, thereby Diffuse light increased. Such disadvantages also exist in Modifications 20 and 21 of FIGS. 60 and 61 .

On the other hand, in the modified example 22 of FIG. 62 in which the outer shape of the groove 25 is formed into a square corresponding to the outer shape of the light emitting source 21, and a circular direct emission region 29 is provided at the center, it can be compared with FIG. 66 (a) ( b) Similarly, the light reflected by the total reflection area 31 can be incident on the specific reflection areas 28s and 28p irrespective of whether it is in the diagonal direction or the opposite side direction. Furthermore, according to modification 22, since the direct emission region 29 is circular, the light emitted radially from the light emitting elements 24R, 24G, and 24B can be reflected or transmitted in the same direction in each direction by the direct emission region 29, and the diffused light can be suppressed. The occurrence of light emission. This function and effect also exist in Modifications 23 and 24 of FIGS. 63 and 64 .

Modification 25 shown in FIG. 67 is a light emitting source 21 in which a total reflection region 31 on the bottom surface of a groove 25 is divided into a plurality of divided regions 31a, 31b, . . . . 68( a ) is a perspective view showing the structure of the direct emission region 29 and the total reflection region 31 of the light emitting source 21 . Figure 68(b)(c) is a diagram showing the state of light in the light emitting light source 21, Figure 68(b) is a schematic cross-sectional view of the light emitting light source 21 in the opposite side direction, and Figure 68(c) is a front view thereof . In addition, in FIG. 68( b ), the total reflection region 31 indicated by the dashed-dotted line represents a part of the total reflection region 31 closer to the observation side than the cross section of the figure. According to Modification 25, the degree of freedom of design increases, and the uniformity of light intensity and color can be improved. In Modification 25, the total reflection region 31 is divided into eight equal parts, and the divided regions 31a and 31b are alternately arranged in the circumferential direction. The inclination directions of the divided regions 31a and 31b are opposite along the circumferential direction, and are arranged so that light emitted in the opposite direction is diffused to both sides, and light emitted in the diagonal direction is concentrated in the diagonal direction.

FIG. 69( a ) is a perspective view showing a total reflection region 31 having a uniform inclination angle around the axis of the direct emission region 29 . Figure 69(b)(c) is a diagram showing the state of light in the light emitting source, Figure 69(b) is a schematic cross-sectional view of the light emitting source 21 in the opposite direction, and Figure 69(c) is a front view thereof. In the comparative example having such a total reflection region 31, as shown in FIG. As a result of an even distribution in all directions, there is not enough light in the diagonal directions. On the other hand, in Modification 25 shown in FIG. 67, as shown in FIG. 68(b)(c), since the divided region 31a and the divided region 31b are arranged so that the light emitted in the direction of the opposite side is diffused to both sides. , Concentrate the light emitted in the diagonal direction to the diagonal direction, so the light is more concentrated in the diagonal direction compared with the diagonal direction, so that more light is distributed to the diagonal direction, thereby improving the brightness of the light source. 21 for uniformity of light intensity and color on the front side.

FIG. 70( a ) is a perspective view showing the configurations of the direct emission region 29 and the total reflection region 31 of the light emitting source 21 according to Modification 26. FIG. Fig. 70(b)(c) is a diagram showing the state of light in the light emitting source 21, Fig. 70(b) is a schematic cross-sectional view of the light emitting source 21 in the opposite side direction, and Fig. 70(c) is a front view thereof . In addition, in FIG. 68( b ), the total reflection region 31 indicated by the dashed-dotted line represents a part of the total reflection region 31 closer to the observation side than the cross section of the figure. In Modification 26, in the light emitting source 21 of FIG. 67 , a circular groove-shaped divided region 31 c is further formed between the divided region 31 a and the divided region 31 b of the total reflection region 31 . According to this modification 26, since the light emitted from the light emitting elements 24R, 24G, and 24B can be diffused again by the circular groove-shaped divided regions 31c, the light intensity and color uniformity of the front surface of the light emitting source 21 can be further improved.

Furthermore, Modification 27 of FIG. 71 is a modification in which the surface of direct emission region 29 is divided into a plurality of divided regions 29a, 29b, . Because the inclination direction or inclination angle of each divided area 29a, 29b, ... can be adjusted by dividing the direct emission area 29, the amount of light distributed to each reflecting area 28i, 28j, 28k, ... can be adjusted, so the front surface of the light emitting source 21 can be further improved. Light intensity and color uniformity. In addition, it is also possible to divide the total reflection area 31 on the bottom surface of the groove 25 into a plurality of divided areas 31a, 31b, ..., and then divide the surface of the direct emission area 29 into a plurality of divided areas, as in the modification 28 of FIG. 72 . 29a, 29b, . . .

FIG. 73 is a front view showing a light emitting source 21 according to Modification 29. FIG. In Modification 29, the total reflection region 30 is divided into a plurality of division regions 30 a , 30 b , . In the light-emitting light source 21 having a flat total reflection region 30, as in the comparative example shown in FIG. The amount of light is insufficient in the corner portion in the diagonal direction farthest from the light emitting element, so that the corner portion tends to be darkened. On the other hand, in the case of dividing the total reflection region 30 into a plurality of divided regions 30a, 30b, ... as in the modification 29 of FIG. 73, as shown in FIG. 74 (a) (b), by adjusting the total reflection The slope or inclination angle of each divided area 30 a , 30 b , . This improves the degree of freedom in design, so that the difference in the light intensity of the light reaching each reflection area of the reflection member 26 can be alleviated, and the light intensity and color uniformity of the front surface of the light emitting source can be improved.

In Modification 29, for example, on the opposite side, the light is diffused by bending the area of the total reflection area 30 in a concave lens shape, or the light is directed diagonally by inclining the area of the total reflection area 30 in a diagonal direction. Directional reflection increases the amount of light distributed to diagonal directions, thereby preventing darkening of the corners in the diagonal direction. Furthermore, in order to reduce loss of light leaking from the outer peripheral surface of the light emitting source 21 and effectively use light, the diagonal end regions of the total reflection region 30 are preferably inclined toward the center side or opposite sides.

And, when the total reflection region 30 is a flat light-emitting light source, as in the comparative example shown in FIG. The light path length from the element is long, so the light intensity is weak, and it is easy to get dark at the edge of the light source. In addition, there is a possibility that light leaks from the outer peripheral surface of the light emitting source and becomes lost light, resulting in a decrease in light utilization efficiency. In the case of Modification 29, at such a timing, as shown in FIG. 76 , the divided regions 30a, 30b, . The light reflected by the regions 30 a , 30 b , . In addition, by inclining the divided regions 30 a , 30 b , . Therefore, according to this modified example 29, the degree of freedom of design increases, and the uniformity of light intensity and color can be improved.

[Example 2]

Fig. 78 is a front view showing a light-emitting light source array 50 according to Embodiment 2 of the present invention. The light emitting source array 50 is a light emitting source array in which the light emitting sources 21 of the present invention are arranged on the same plane without gaps or with slight gaps. The light-emitting light source array 50 is used as a backlight for liquid crystal displays or liquid crystal televisions, or as an illumination device, and has the advantages of thin thickness, excellent color reproducibility, low color unevenness and high color uniformity.

In addition, when the light emitting source array 50 using the light emitting light source 21 of the present invention is used as a backlight source, the front space (space between the target surface) required for uniformity of light intensity and uniformity of color mixing degree Since it is shorter, the thickness of an information display device incorporating the light emitting light source 50 as a backlight (for example, a liquid crystal display described later) can be reduced, enabling thinning of the information display device.

Furthermore, in the light emitting source array 50 using the light emitting light sources 21, even if the light emitting sources 21 are arrayed, the light emitting elements are not densely packed, so the heat dissipation is improved, and the heat dissipation mechanism can be simplified. In addition, the simplification of the heat dissipation mechanism contributes to the thinning of information display devices such as liquid crystal displays.

[Example 3]

Fig. 79 is a schematic cross-sectional view showing the structure of a liquid crystal display (liquid crystal display device) 51 according to Embodiment 3 of the present invention. The liquid crystal display 51 is configured by arranging a backlight 53 on the back of a liquid crystal panel 52 . The liquid crystal panel 52 is a general panel, and is constituted by laminating a polarizing plate 54 , a liquid crystal cell 55 , a retardation plate 56 , a polarizing plate 57 , and an antireflection film 58 in this order from the back side.

The backlight 53 is a backlight in which a light-diffusing film 61 , a prism sheet 62 , and a brightness-enhancing film 63 are arranged in front of a light-emitting light source array 50 in which a plurality of light-emitting light sources 21 are arranged. As will be described later, the light emitting sources 21 form a square when viewed from the front, and about 100 to several hundreds of these light emitting sources 21 are arranged in a checkerboard shape to form the light emitting source array 50 . The light-diffusing film 61 diffuses the light emitted from the light-emitting source array 50 to uniformize the luminance and to uniformly mix the light of each color emitted from the light-emitting source array 50 . The prism sheet 62 is a member that bends obliquely incident light in the vertical direction through the prism sheet 62 through refraction or internal reflection, thereby improving the front brightness of the backlight 53 .

The brightness improvement film 63 is a film that transmits linearly polarized light in a certain polarization plane and reflects linearly polarized light in a plane perpendicular to it, and has the function of improving the utilization efficiency of light emitted from the light emitting source array 50 . That is, the brightness improvement film 63 is disposed so that the polarization plane of transmitted light coincides with the polarization plane of the polarizing plate 54 used in the liquid crystal panel 52 . Therefore, among the light emitted from the light emitting source array 50, the light whose polarization plane is consistent with the polarizer 54 passes through the brightness improvement film 63 and is incident on the liquid crystal panel 52, but the light whose polarization plane is perpendicular to the polarizer 54 is absorbed by the brightness improvement film. 63 is reflected and returns, and is reflected by the light emitting source array 50, and is incident on the brightness improving film 63 again. The polarization plane of the light reflected and returned by the brightness improving film 63 is rotated before being reflected by the light source array 50 and then entering the brightness improving film 63 , so a part of the light is transmitted through the brightness improving film 63 . By repeating such actions, most of the light emitted from the light emitting light source array 50 is utilized by the liquid crystal panel 52, and the brightness of the liquid crystal panel 52 increases.

Fig. 80 is a schematic sectional view showing a modified example of the third embodiment. In the liquid crystal display 64 of this modified example, the prism sheet 62 and the brightness improvement film 63 arranged between the light emitting source array 50 and the liquid crystal panel 52 in the liquid crystal display 51 of FIG. 79 are omitted. Of course, either one of the prism sheet 62 and the brightness improvement film 63 may be omitted. According to the light emitting source array 50 of the present invention, the direction or diffusion of the light emitted from the light emitting source 21 can be adjusted with high precision, so the prism sheet used in the conventional liquid crystal display device or backlight can be unnecessary. In addition, when the light emitting source array 50 of the present invention is used, since the direction of the light emitted from the light emitting source 21 or its diffusion can be adjusted to increase the light intensity, the brightness improving film used in the conventional liquid crystal display device can be unnecessary.

Therefore, according to this modified example, the prism sheet or the brightness improvement film can be omitted, and as a result, the thickness of the liquid crystal display 64 can be reduced, and the assembly cost can be reduced. Also, since there is no light loss in the prism sheet or the brightness improving film, the utilization efficiency of light can be improved.

【Example 4】

Fig. 81 is a perspective view showing a lighting device 72 for indoor lighting using the light-emitting light source array of the present invention. The illuminating device 72 incorporates the light-emitting light source array 73 of the present invention into a casing 74 , and a power supply device 75 is arranged on the casing 74 . If the plug 76 drawn from the power supply device 75 is inserted into a socket such as a commercial power supply, and the switch is turned on, the AC power provided from the socket of the commercial power supply is converted into direct current by the power supply device 75, and the light emitting source array 73 is activated by the direct current. glow. Therefore, this lighting device 72 can be used, for example, as a wall-mounted indoor lighting device or the like.

Claims (19)

1. A luminescent light source having: a reflecting member for reflecting light, a light guide portion disposed on a light reflecting surface side of the reflecting member, and a light emitting element for projecting light to the light guide portion,

the light emitting element is disposed in a central region of the reflecting member, the light guide portion has a light emitting surface that emits light emitted from the light emitting element and light of the light emitting element reflected by the reflecting member to the outside, the reflecting member has a light reflecting surface that reflects light emitted from the light emitting element and reflected by the light emitting surface of the light guide portion, and the light reflecting surface is configured by a plurality of reflecting regions arranged in at least 2 directions.

2. A luminescent light source having: a reflecting member for reflecting light, a light guide portion disposed on a light reflecting surface side of the reflecting member, and a light emitting element for projecting light to the light guide portion,

the light emitting element is disposed in a central region of the reflecting member, the light guide portion has a light emitting surface that emits light emitted from the light emitting element and light of the light emitting element reflected by the reflecting member to the outside, the reflecting member has a light reflecting surface that reflects light emitted from the light emitting element and reflected by the light emitting surface of the light guide portion, and the light reflecting surface is formed by arranging a plurality of reflecting regions in a mosaic shape.

3. A luminescent light source as claimed in claim 1 or 2, characterized in that the reflection area is square, rectangular, hexagonal, triangular or fan-shaped.

4. The luminescent light source according to claim 1 or 2, wherein characteristic quantities characterizing the respective reflection regions are different from each other between the reflection regions adjacent in each direction in which the reflection regions are arranged.

5. The luminescent light source according to claim 1 or 2, wherein characteristic quantities characterizing the respective reflection regions are different from each other between the reflection regions adjacent in the direction between the directions in which the reflection regions are arranged.

6. The luminescent light source according to claim 4, wherein the characteristic amount is a displacement amount of each of the reflection regions in an optical axis direction of the reflection member.

7. The luminescent light source according to claim 4, wherein each of the reflection regions is a conical surface, and the characteristic quantity is a radius of curvature indicating the conical surface.

8. The luminescent light source according to claim 4, wherein each of the reflection regions is a conical surface, and the characteristic quantity is a conical coefficient representing the conical surface.

9. The luminescent light source according to claim 1 or 2, comprising a plurality of the luminescent elements having different luminescent colors.

10. The luminescent light source according to claim 9, wherein the adjacent reflection regions reflect light of the respective light emitting elements so that light emitted from the different light emitting elements is emitted substantially perpendicularly to a front direction.

11. The luminescent light source according to claim 1 or 2, wherein the surface of the light guide portion is divided into a plurality of regions, and the inclination angle or the inclination direction of the surface is changed for each of the divided regions.

12. An array of light sources, wherein a plurality of light sources according to claim 1 or 2 are arranged.

13. A method for setting an optical path of a light source having a reflecting member for reflecting light, a light guide portion disposed on a light reflecting surface side of the reflecting member, and a light emitting element for projecting light to the light guide portion, the method comprising: disposing the light emitting element in a central region of the reflecting member; forming a light emitting surface in the light guide portion so that light emitted from the light emitting element and light of the light emitting element reflected by the reflecting member are emitted to the outside; and a step of forming, in the reflecting member, a light reflecting surface that reflects light emitted from the light emitting element and reflected by the light emitting surface of the light guide portion by a plurality of reflecting regions arranged in at least 2 directions, and setting a reflecting direction of the reflected light generated in each reflecting region.

14. A light emission method of a light emission source including a reflecting member that reflects light, a light guide portion disposed on a light reflecting surface side of the reflecting member, and a light emitting element that projects light to the light guide portion, the light emission method comprising: disposing the light emitting element in a central region of the reflecting member; forming a light emitting surface in the light guide portion so that light emitted from the light emitting element and light of the light emitting element reflected by the reflecting member are emitted to the outside; and a step of forming, in the reflecting member, a light reflecting surface for reflecting light emitted from the light emitting element and reflected by the light exit surface of the light guide portion by a plurality of reflecting regions arranged in at least 2 directions, and adjusting an emission direction and a luminous intensity distribution of the light emitted from the light exit surface of the light guide portion by setting a reflecting direction of the reflected light generated by each reflecting region.

15. An illumination device having: a light source array in which a plurality of light sources according to claim 1 or 2 are arranged, and a power supply device for supplying power to the light source array.

16. A backlight characterized in that a plurality of the light-emitting sources according to claim 1 or 2 are arranged in the same plane.

17. A liquid crystal display device has: a light source array in which a plurality of light sources according to claim 1 or 2 are arranged, and a liquid crystal display panel disposed to face the light source array.

18. The liquid crystal display device according to claim 17, wherein no optical member is provided between the light-emitting source array and the liquid crystal display panel to direct the traveling direction of the light emitted from the light-emitting source array toward the front direction of the liquid crystal display panel.

19. The liquid crystal display device according to claim 17, wherein an optical member for increasing the luminance of light for illuminating the liquid crystal display panel is not provided between the light emitting source array and the liquid crystal display panel.

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