CN101321986A - Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device - Google Patents
Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device Download PDFInfo
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Abstract
The present invention relates to a light guide member, a planar light source device thereof with the light guide member and a display apparatus using the planar light source device. The aim of the invention is to provide a light guide member that is laminated on the upper surface of a luminous device mounting substrate on which a luminous device such as an LED has been mounted. In the light guide member, a luminance at the section directly over the luminous device is lowered, a luminance distribution on a light emission face of the light guide plate can be uniformed, a nonuniformity in luminance and an unevenness of colors can be decreased, a utilization efficiency of a light can be increased, and a high luminance can be implemented. In addition, it is an object to provide the light guide member, the planar light source device provided with the light guide member, and the display apparatus using the planar light source device. As the planar light source device uses the light guide member, the display device can be thinned and miniaturized. A light guide plate, which is laminated on the upper face of a luminous device mounting substrate on which a luminous device is mounted and which is for diffusing and guiding upward a light emitted from the luminous device, is characterized by comprising a light reflecting portion formed on the bottom face of the light guide member in an area other than an area around the luminous device.
Description
The cross reference of related application
The application is the application of submitting to down at 35U.S.C. § 111 (a), this application requires the provisional application 60/748 in submission on December 8th, 2005 according to 35U.S.C. § 111 (b) according to 35U.S.C. § 119 (e) (1), 191 and the rights and interests of applying date of the provisional application 60/789,128 submitted on April 5th, 2006.
Technical field
The present invention relates to a kind of light guide member, a kind of planar light source device, and a kind of display device that utilizes this planar light source device.Particularly, the present invention relates to: a kind of light guide member; The illuminator that a kind of planar light source device with this light guide member, this planar light source device are used for advertisement light fixture, illumination and are used as LCD backlight, and the light diffusion of selfluminous device in the future and the guiding that makes progress equably; And the display device that utilizes this planar light source device, for example liquid crystal display.
Background technology
In recent years, be extensive use of and utilize planar light source device (backlight) with from the back side of panel or the display device of lateral emitting, for example LCD.Traditionally, this type of main flow that is used for the backlight liquid crystal display illuminator is so-called edge-lit type, and wherein the cold-cathode tube as illuminator is positioned on the edge surface on chassis, with thickness and the power consumption that reduces this device.
Have the backlight luminescence body of the illuminator of structure as shown in figure 24 as this type of edge-lit type.
More specifically, for the backlight luminescence body 100 of edge-lit type, on the marginal portion on chassis 102, arrange cold-cathode tube 104.At the side arrangement light guide member 106 of cold-cathode tube 104, on the upper surface of light guide member 106, arrange diffusion sheet 108, construct backlight luminescence body 100 thus.
For the backlight luminescence body 100 of edge-lit type,, enter the lateral parts of light guide member 106 by the light of cold-cathode tube 104 radiation by making cold-cathode tube 104 become illuminator.
The light that enters light guide member 106 is by diffusion, simultaneously repeated reflection between the upper surface 118 of being made or for example drawn with chalk point-like figure reflecting part 116 that make, that be formed at light guide member 106 belows and light guide member 106 by small (concavo-convex) uneven structure.This light is then upwards derived from the upper surface 118 of light guide member 106 equably.
By above configuration, light reduces the heterogeneity of the brightness/illumination of liquid crystal panel 110 thus by proliferation part 108 diffusion equably.
Yet, require the size of LCD increasingly in recent years, there is limitation in the backlight luminescence body 100 of edge-lit type aspect brightness and the brightness uniformity improving.
Therefore, investigate use direct light emitting-type light source is used for the large scale liquid crystal display.
Yet as under the situation of direct light emitting-type light source, because the cold-cathode tube volume ratio is bigger, the thickness of LCD increases at above-mentioned cold-cathode tube.In addition, the colorrendering quality of cold-cathode tube and responsiveness are also unsatisfactory, and afterimage phenomena takes place.
In recent years, the luminous efficiency of light-emitting device was greatly improved, and the application that light-emitting device is used to throw light on just is modified.Particularly, using under the situation of light emitting diode (after this being called LED) as backlight liquid crystal display illuminator (area source), can realize good colorrendering quality and high-speed response, and can expect to obtain high image quality.
Therefore, a kind of backlight luminescence body of direct light emitting-type has been proposed traditionally, wherein a plurality of LED with etc. pitch be arranged in liquid crystal panel below.
Have the backlight luminescence body of the illuminator of structure shown in Figure 25 for this type of direct light emitting-type.
More specifically, for the backlight luminescence body 200 of direct light emitting-type, a plurality of LED lamps 206 with etc. pitch be arranged on the bottom surface 204 on chassis 202 with array pattern.
On the upper surface on chassis 202, arrange proliferation part 208 equidistantly, and prismatic lens 210 places on the upper surface of proliferation part 208, construct backlight luminescence body 200 thus with LED lamp 206.
On the bottom surface 204 on chassis 202 and side 212, form the reflecting part 214 of making by reflecting piece etc.
For the backlight luminescence body 200 of the direct light emitting-type of as above constructing, producing under the situation of light the direct directive diffusion sheet 208 of the light that is sent by LED lamp 206.In addition, the light that is sent is also reflected by the bottom surface 204 and the reflecting part on the side 212 214 on chassis 202, and directive diffusion sheet 208.
Enter the then diffusion in diffusion sheet 208 of light of diffusion sheet 208, and tilting in vertical direction via the prismatic lens on the upper surface that is positioned at diffusion sheet 208 210.Light then enters the display panels (not shown) on the upper surface that places prismatic lens 210.
In addition, from the space of light between LED lamp and diffusion sheet 208 that LED lamp 206 sends, mix.This mixes follows by the enhancing of the diffusion in the diffusion sheet 208, realizes uniform brightness and uniform colourity thus.
In addition, generally, the brightness that is positioned at the section directly over the LED lamp 206 is greater than other zone.Therefore, by increasing the degree of diffusion of diffusion sheet 208 being positioned at section directly over the LED lamp 206, can improve the uniformity of brightness.
For the backlight luminescence body 200 of existing direct light emitting-type, as mentioned above, arranged diffusion sheet 208, and diffusion sheet 208 and LED lamp 206 intervals, to obtain uniform luminance and colourity.But even in this case, said apparatus is not enough to address this problem: the brightness that is positioned at the section directly over the LED lamp 206 is higher.
Recently, be the LED lamp (without monochromatic LED) of the multicolour (RGB) formed of red, green and blue LED by using by three primary colors, the realization color mixture.In the case, color mixture is insufficient, finds that in some cases irregular colour is even.
Therefore, for heterogeneity and the irregular colour that reduces brightness, as mentioned above, further be increased in the diffusivity of the diffusion sheet 208 of the section directly over the LED lamp 206.
In addition, in patent documentation 1 (Japanese unexamined publication open file No.2001-42782), directly over the LED lamp, arrange the gray scale printing layer (grayprinting layer) of so-called light curtain, to reduce to be positioned at the brightness of the section directly over the LED lamp in some cases as having semi-transparency.
But said apparatus causes light utilization efficiency to reduce.
In addition, further away from each other under the situation of LED lamp 206, the inhomogeneities of brightness and irregular colour can reduce at diffusion sheet 208.But this method causes thickness backlight to increase, and for flat-panel displays, this method is not preferred.
Therefore, patent documentation 2 (Japan Patent open file No.1998-82915) has proposed a kind of planar light source device 300 as shown in figure 26.
More specifically, for planar light source device 300, stacked light guide member 306 on the upper surface of the light-emitting device installation base plate 308 that LED lamp 302 is installed.In light guide member 306, be formed for the recess of LED lamp housing 304, make that the width of recess is narrower in darker section, the surface of distance light guide member in the position corresponding with LED lamp 302.
In addition, on the bottom surface 310 of light guide member 306, except the section corresponding, form the reflecting part 312 of making by reflector plate etc. with the recess that is used for LED lamp housing 304.
By above-mentioned structure, as shown in figure 26, the light B1 that sends from LED lamp 302 is by diffusion, simultaneously at the upper surface 314 of light guide member 306 be formed on repeated reflection between the reflecting part 312 on the bottom surface 310 of light guide member 306, shown in arrow B 2, and by the upper surface 314 upwards guiding equably from light guide member 306.
As a result, light by the diffusion of the diffusion sheet (not shown) on the upper surface that is formed on light guide member 306, prevents the inhomogeneous of brightness equably thus, and the uniform luminance on the light-emitting area of realization light guide member 306 distributes.
Therefore, the disclosed planar light source device of patent documentation 2 300 is thinner than conventional device, has irregular colour hardly, and can improve brightness.
[patent documentation 1] Japanese unexamined publication open file No.2001-42782
[patent documentation 2] Japan Patent open file No.1998-82915
Summary of the invention
The technical problem to be solved in the present invention
In patent documentation 2 described planar light source devices 300, attempt to make brightness even.But, as shown in figure 26, for planar light source device 300, the light that sends from LED lamp 302 by in addition near reflecting part 312 reflections of LED lamp 302, shown in arrow B 3, and from the upwards emission and the guiding of upper surface 314 of light guide member 306.
The result, big from the upper surface 314 of light guide member 306 in the light quantity that is positioned at the section emission directly over the LED lamp 206, shown in the dotted line that the length among Fig. 4 replaces, said method is not enough to address this problem: the brightness that is positioned at the section directly over the LED lamp 206 is higher.
The present invention carries out under the prerequisite of having considered above-mentioned situation, and the purpose of this invention is to provide a kind of being laminated to for example light guide member of the upper surface of the light-emitting device installation base plate of LED lamp of light-emitting device is installed.In this light guide member, the brightness that is positioned at the section directly over the LED lamp 206 can reduce, and can make the illuminance distribution on the light-emitting area of light guide member, can reduce the inhomogeneities and the irregular colour of brightness, can improve light utilization efficiency, and can obtain high brightness.In addition, but use the also attenuation and the miniaturization of planar light source device of this light guide member.
In addition, another object of the present invention provides a kind of planar light source device, and the display device that uses this planar light source device, wherein can reduce the inhomogeneities and the irregular colour of brightness, can improve light utilization efficiency, and can realize high brightness.In addition, but also attenuation and the miniaturization of this planar light source device and display device.
The method of dealing with problems
The inventor has studied the problems referred to above to solve them.As a result, inventor's light guide member of the present invention of giving chapter and verse has the planar light source device of this light guide member, and the display device that uses this planar light source device.
More specifically, for example the present invention relates to, following modes (1) arrives (16).
(1) a kind of light guide member, this light guide member be arranged on the upper surface of the light-emitting device installation base plate that light-emitting device is installed and be used for diffusion and upwards guiding it is characterized in that from the light of light-emitting device emission, comprising:
Reflector segment, this reflector segment be formed on the bottom surface of light guide member not around described light-emitting device near the position; And
One section in this section, does not form reflector segment near the position that is centered around the described light-emitting device on the bottom surface of light guide member.
(2) as above-mentioned (1) described light guide member, it is characterized in that, also comprise:
Be arranged in the recess that is used for described light-emitting device of the described light guide member position corresponding with described light-emitting device; And
Be positioned at the semi-transparent part on the part on recessed surface of the recess that is used for described light-emitting device.
As above-mentioned (2) described light guide member, it is characterized in that (3) recessed lip-deep described semi light transmitting part divides formation on the throne in the position of described light-emitting device top.
As each described light guide member in above-mentioned (1) to (3), it is characterized in that (4) being centered around near the zone of described light-emitting device is apart from the zone of light-emitting device apart from homogeneous.
As each described light guide member in above-mentioned (1) to (4), it is characterized in that (5) also comprise being positioned at the point-like reflector segment that is centered around near the zone of described light-emitting device, the dot density of wherein said reflector segment is lower than the section of close light-emitting device.
(6) as above-mentioned (1) described light guide member, it is characterized in that, also comprise the semi-transparent part of the position corresponding on the upper surface that is positioned at described light guide member with described light-emitting device.
As above-mentioned (6) described light guide member, it is characterized in that (7) described semi light transmitting part branch is formed on the position directly over the described light-emitting device of being positioned on the upper surface of described light guide member.
(8) as above-mentioned (7) described light guide member, it is characterized in that, described semi light transmitting part branch be formed on the upper surface of described light guide member be centered around near the described light-emitting device from the position of described light-emitting device apart from homogeneous.
(9) as each described light guide member in above-mentioned (1) to (8), it is characterized in that, be installed in a plurality of light-emitting device dispersed placement on the light-emitting device installation base plate, and be centered around a plurality of positions corresponding that near the zone that does not wherein form reflector segment of described light-emitting device is arranged at the light guide member bottom surface with described light-emitting device.
(10) as above-mentioned (9) described light guide member, it is characterized in that, D/4 is equal to or greater than d, distance in wherein a plurality of light-emitting devices between the adjacent light-emitting device is D, and the distance from described light-emitting device to the neighboring that is centered around near the zone that does not wherein form reflector segment the described light-emitting device is d.
(11) as each described light guide member in above-mentioned (1) to (10), it is characterized in that, the light-emitting device that is installed on the light-emitting device installation base plate is constructed by the unit light-emitting device that wherein makes up the multiple light-emitting device that has different glow colors, and is centered around zone that does not wherein form reflector segment and the corresponding formation of described unit light-emitting device near the described light-emitting device.
(12) as each the described light guide member in above-mentioned (2) to (5), it is characterized in that, the light-emitting device that is installed on the light-emitting device installation base plate is constructed by the unit light-emitting device that wherein makes up the multiple light-emitting device that has different glow colors, and the described recess and the corresponding formation of described unit light-emitting device that is used for light-emitting device.
(13) a kind of planar light source device is characterized in that, is arranged on the upper surface of the light-emitting device installation base plate that light-emitting device is installed as each described light guide member in above-mentioned (1) to (12).
(14) as above-mentioned (13) described planar light source device, it is characterized in that described light-emitting device is a light emitting diode.
(15) a kind of display device is characterized in that, comprises the display part that places as on the upper surface of above-mentioned (13) or (14) described planar light source device.
(16) as above-mentioned (15) described display device, it is characterized in that described display part is a liquid crystal panel.
The invention effect
Light guide member according to the present invention comprises: on the bottom surface of light guide member not around the described light-emitting device near the reflector segment of position formation; An and section, in this section, do not form reflector segment near the position that is centered around on the bottom surface of light guide member the described light-emitting device, the diffusion intensity that makes progress that the light guide member bottom surface that makes near around the place, bottom surface of the light guide member light-emitting device upwards diffusion intensity be provided with reflector segment than in its periphery section is located is low.Therefore, can reduce the brightness that is positioned at the section directly over the light-emitting device, but the Luminance Distribution on the light-emitting area of homogenising light guide member can reduce the inhomogeneities and the irregular colour of brightness, can improve light utilization efficiency, and can realize high brightness.
Pass through embodiments of the invention, the position corresponding to light-emitting device on the upper surface of light guide member forms semi-transparent part, or the light-emitting device in being formed at light guide member is with forming the semi-transparent part with reflection and diffused light function on the recessed surface of recess.Therefore, owing to reflected diffusely by semi-transparent part from the light of light-emitting device emission, so, inhibition is positioned at the increase of the brightness of the section directly over the light-emitting device, but the Luminance Distribution on the light-emitting area of homogenising light guide member, can reduce the inhomogeneities and the irregular colour of brightness, can improve light utilization efficiency, and can realize high brightness.
In addition, at light guide member as under the situation of planar light source device, but the homogenising Luminance Distribution can reduce the inhomogeneities and the irregular colour of brightness, can improve light utilization efficiency, but this also attenuation and miniaturization of device.
In addition, by using the planar light source device of this type of light guide member, reduce owing to be positioned at the brightness of the section directly over the light-emitting device, brightness is uniform, can realize higher brightness, it is even that irregular colour can not take place, and colourity is even on whole of planar light source device.
Therefore, using planar light source device according to the present invention, particularly, can obtain display device slim and that have high image quality as being used under the situation of backlight liquid crystal display as display device.
Description of drawings
Fig. 1 is the view that illustrates according to the overall configuration of the typical liquid crystal display of present embodiment;
Fig. 2 illustrates the end face view according to first embodiment of planar light source device of the present invention of using with good grounds light guide member of the present invention;
Fig. 3 illustrates the viewgraph of cross-section that amplifies along the part of the configuration of A-A line among Fig. 2;
Fig. 4 illustrates from the distance of the horizontal direction of LED and the figure of relative brightness;
Fig. 5 is the schematic plan that the shape that is centered around near the zone that does not wherein form reflector segment the described light-emitting device is shown at light guide member according to the present invention;
Fig. 6 is the schematic plan that the shape that is centered around near the zone that does not wherein form reflector segment the described light-emitting device is shown at light guide member according to the present invention;
Fig. 7 is the cross sectional representation that illustrates according to second embodiment of planar light source device of the present invention;
Fig. 8 is the vertical view that the third embodiment of the present invention of the light guide member of using with good grounds another embodiment of the present invention is shown;
Fig. 9 be illustrate along the configuration of A-A line among Fig. 8 the viewgraph of cross-section that amplifies of part;
Figure 10 is the vertical view of the 4th embodiment that the planar light source device of the present invention of the light guide member of using with good grounds another embodiment of the present invention is shown;
Figure 11 is the vertical view of the 5th embodiment that the planar light source device of the present invention of the light guide member of using with good grounds another embodiment of the present invention is shown;
Figure 12 is the vertical view that the 6th embodiment of the planar light source device of the present invention of using with good grounds light guide member of the present invention is shown;
Figure 13 illustrates the viewgraph of cross-section that amplifies along the part of the configuration of A-A line among Figure 12;
Figure 14 is the schematic plan that the shape that is centered around near the zone that does not wherein form reflector segment the described light-emitting device is shown at light guide member according to the present invention;
Figure 15 is the schematic plan that the shape that is centered around near the zone that does not wherein form reflector segment the described light-emitting device is shown at light guide member according to the present invention;
Figure 16 is the cross sectional representation that illustrates according to the 7th embodiment of planar light source device of the present invention;
Figure 17 is the vertical view of the 8th embodiment that the planar light source device of the present invention of the light guide member of using with good grounds another embodiment of the present invention is shown;
Figure 18 is the vertical view that the planar light source device of the present invention of the light guide member of using the with good grounds embodiment of the invention 1 is shown;
Figure 19 is the vertical view that the planar light source device of the present invention of the light guide member of using the with good grounds embodiment of the invention 2 is shown;
Figure 20 is the vertical view that the planar light source device of the present invention of the light guide member of using the with good grounds embodiment of the invention 3 is shown;
Figure 21 is the vertical view that the planar light source device of the present invention of the light guide member of using with good grounds comparative example 1 of the present invention is shown;
Figure 22 is the vertical view that the planar light source device of the present invention of the light guide member of using with good grounds comparative example 2 of the present invention is shown;
Figure 23 be illustrated in according in embodiments of the invention and the comparative example apart from the distance of light-emitting device 14 along continuous straight runs and the figure of relative brightness;
Figure 24 is the cross sectional representation that existing edge-lit type backlight luminescence body is shown;
Figure 25 is the cross sectional representation that existing direct light emitting-type backlight luminescence body is shown; And
Figure 26 is the cross sectional representation that existing planar light source device is shown.
The specific embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
Fig. 1 is the view that the overall configuration of using the liquid crystal display example that present embodiment is arranged is shown.Application has the liquid crystal display of present embodiment to have direct light emitting-type back lighting device (backlight) 50, this back lighting device comprises the framework backlight 51 of surrounding luminous component and LED substrate (light-emitting device installation base plate) 52, and a plurality of light emitting diodes (LED) 53 of wherein arranging promising solid luminous device on this LED substrate are with as illuminator.Back lighting device 50 is provided with light guide member (plate or sheet) 54 on LED substrate (installation base plate) 52.Light guide member with feature of the present invention is enclosed in the framework backlight (chassis) 51.
Be that with existing direct light emitting-type back lighting device difference shown in Figure 25 light guide member places the space between light emitting diode and the proliferation part (plate).In addition, do not increase thickness backlight, and the space between light emitting diode and the proliferation part (plate) can reduce.The thickness of proliferation part (plate) can reduce.Be used to make light scattering and diffusion to obtain the proliferation part (plate or sheet) 55 of uniform luminance on whole surface, and itself be to have the prismatic lens 56 and 57 of the diffraction grating film of spotlight effect (diffractiongrating film) forward, be placed on the light guide member as the optical compensating gage laminate.In addition, LCD MODULE 60 is provided with liquid crystal panel 61, wherein liquid crystal is inserted and put by two glass substrate, and this LCD MODULE 60 also is provided with the polarizer (polarizing filter) 62 and 63 on each glass substrate that is laminated to liquid crystal panel 61, with the light wave vibration limiting at specific direction.In addition, liquid crystal display also is provided with peripheral components, for example drives and uses LSI, although this does not illustrate in the drawings.
Liquid crystal panel 61 comprises multiple assembly, although these do not illustrate in the drawings.For example, liquid crystal panel is provided with two glass substrate, show electrode, active device for example thin film transistor (TFT), liquid crystal, dividing plate, sealant, oriented film, common electrode, diaphragm, colored filter, although these do not illustrate in the drawings.
In addition, can select any configurational unit of back lighting device 50.For example, only a unit that is provided with the framework backlight 51 of LED substrate 52 can be described as back lighting device (backlight), and can adopt and do not comprise for example circulation type of proliferation part 53 and prismatic lens 54 and 55 of optical compensating gage laminate.
Fig. 2 illustrates the end face view according to first embodiment of planar light source device of the present invention of using with good grounds light guide member of the present invention.Fig. 3 is the local enlarged cross-sectional view that illustrates along the configuration of A-A line among Fig. 2.
In Fig. 2 and Fig. 3, Reference numeral 10 is represented on the whole according to planar light source device of the present invention.
As shown in Figure 3, planar light source device 10 according to the present invention is provided with light-emitting device installation base plate 12, and for example LED of light-emitting device 14 is installed on the upper surface of light-emitting device installation base plate 12.
As shown in Figure 2, on the upper surface of light-emitting device installation base plate 12, arrange a plurality of light-emitting devices 14 with array format with equal pitch.
In addition, above the upper surface of light-emitting device installation base plate 12, arrange the light guide member of making by transparent resin etc. 16.As shown in Figure 3, the position corresponding with light-emitting device 14 is formed for the recess 20 of light-emitting device on the bottom surface 18 of light guide member 16, and light-emitting device 14 is contained in the recess 20 that is used for light-emitting device.
This shape that is used for the recess 20 of light-emitting device can be modified to cheese, semi-spherical shape, ring taper etc.
On light-emitting device installation base plate 12, form the lead pattern of making by copper etc., control the light emission of light-emitting device 14 thus, although this does not illustrate in the drawings.
More specifically, in the present embodiment, as shown in Figures 2 and 3, the almost whole lower face in the bottom surface 18 of light guide member 16 except light-emitting device 14 peripheral regions, is formed with the reflector segment of being made by whitewash etc. 22.
As shown in figure 26, for existing planar light source device 300, as shown by arrow B, the light that sends from LED lamp 302 by in addition be positioned at around the LED lamp 302 near reflecting part 312 reflections, and by upwards diffuse reflection ground guiding of upper surface 314 from light guide member 306.
Therefore, big from the light quantity that the upper surface 314 of light guide member 306 penetrates for existing planar light source device 300 shown in the chain-dotted line that the length of Fig. 4 replaces in the section that is positioned at directly over the LED lamp 302, and higher in the section brightness that is positioned at directly over the LED lamp 302.
In contrast, for planar light source device 10 according to the present invention, because reflector segment 22 is not formed on around the light-emitting device 14, shown in the arrow C among Fig. 3, the light that penetrates from light-emitting device 14 (fully) regularly and is guided between the upper surface 26 of light guide member 16 and bottom surface 18 by near the reflection around the light-emitting device 14 of the bottom surface 18 of light guide member 16.Light is not upwards to be guided by the upper surface 26 from light guide member 16 by scattered reflection/diffuse reflection.
Shown in the arrow C of Fig. 3, the light that arrives reflector segment 22 by scattered reflection from light guide member 16 upwards diffuse reflection/scattered reflections.
By above configuration, as mentioned above, near the intensity of the upwards diffusion around place, the bottom surface of light guide member 16 light-emitting device 14 is less than the intensity in the diffusion that makes progress at the place, light guide member 16 bottom surfaces of its periphery section.
By above configuration, shown in the dotted line of Fig. 4, compare with existing backlight luminescence body, the brightness that is positioned at around the section directly over the light-emitting device 14 reduces, and compare with existing backlight luminescence body, the brightness outside the described section increases, and improves the uniformity of brightness thus.
Although near the zone 24 (wherein not forming reflector segment 22) that is centered around the light-emitting device 14 is round-shaped in the present embodiment, promptly make the constant distance at any edge, but shape that should the zone is not limited to above-mentioned shape from light-emitting device 14 to this zone.As shown in Figure 5, this regional shape can be oval (Fig. 5 (A)), rectangle (Fig. 5 (B)), triangle (Fig. 5 (C)), arch (Fig. 5 (D)), polygon or other shape.
In addition, be centered around near the light-emitting device 14 its and do not form the zone 24 of reflector segment 22, promptly, being defined as shown in Figure 3 from the center of light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device apart from d1, corresponding with the kind and the thickness of the kind of the kind of light-emitting device 14 and brightness, light guide member 16 and thickness and reflector segment 22, make that brightness is almost even shown in the solid line among Fig. 4.Above-mentioned zone is not subjected to concrete restriction.
For example, at light-emitting device 14 is under the situation of LED, light guide member 16 is that thickness is the transparent resin plate of 3mm, and reflector segment 22 is that whitewash and thickness are 5-100 μ m, is about 40mm to the neighboring that is centered around near the zone the light-emitting device apart from d1 from light-emitting device 14.
In addition, as shown in Figure 2, if the distance between the adjacent light-emitting device of a plurality of light-emitting device 14 is D, the homogeneous distance from the center of light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device 14 is d, and so preferred D/4 is equal to or greater than d.
Although light-emitting device 14 is not subjected to concrete restriction,, for example, LED is preferred for the backlight luminescence body of liquid crystal display, and this is because can realize gratifying colorrendering quality, high-speed response and high image quality.
Although monochromatic LED can be used as LED, but also can use wherein combination that the unit light-emitting device of the multiple light-emitting device with different glow colors is arranged suitably, for example, the sub-assembly that is called as three-in-one type, wherein use the led chip of red green blue tricolor, promptly send the LDE chip R of ruddiness, send the led chip G of green glow, and the led chip B that sends blue light, and by mixing these colors formation white lights.
As light-emitting device 14, can adopt the moulding encapsulating products of LED wherein, or the surface is provided with the LED of hemispherical lens thereon with the moulding resin sealing.
Even if combination has the multiple light-emitting device 14 of different glow colors to be used as similar three-in-one type, as shown in Figure 6, be centered around near the shape in the zone 24 the light-emitting device 14, corresponding with the layout shape of led chip, except being the circle shown in the embodiment of Fig. 2, also can be oval (Fig. 6 (A)), rectangle (Fig. 6 (B)), triangle (Fig. 6 (C)), arch (Fig. 6 (D)), polygon or its shape.
In the case, although it is not shown, the unit light-emitting device, except being as the above-mentioned unit that comprises a R, a G and a B, it can also be the unit that comprises a R, two G and a B, or comprise the unit of two R, two G and a B, and this combination is not subjected to concrete restriction.
In addition, the unit light-emitting device is not limited to three kinds of colors of above-mentioned RGB.For example, can on a substrate, install have that so-called Neutral colour is for example yellow, orange and blue or green led chip have 4,5 or the led chip of 6 kind of color with structure.
In addition, under the situation that light is propagated in light guide member 16, light guide member 16 is not subjected to concrete restriction, and for example acrylic resin, polycarbonate resin, liquid crystal polymer and polystyrene resin can be used for light guide member 16.Can be separately or lamination come suitable use to have the member of the flake shape of the member of thick relatively plate-like shape or relative thin.
The shape that is used for the pit 20 of light-emitting device is not subjected to concrete restriction, and can be for example cone, pyramid, cylinder, prism or hemisphere.
In addition, reflector layer 22 is not subjected to concrete restriction, and can be by for example metal forming such as aluminium foil, metallic film such as aluminium, gold, and silver, platinum, or chalk is made.
Under the situation of metal forming such as aluminium foil, metal forming can be bondd by clear binder.In addition, at metallic film such as aluminium, gold, under the situation of silver and platinum, metallic film can be by forming such as methods such as deposition, sputter and electroless platings.In addition, under the situation of chalk, for example, can use the acrylic resin that comprises titanium dioxide, and this acrylic resin can pass through distributor, spraying, powder coated, roll coater, Curtain flow coater and paintbrush coating.
In said method, from the angle of easy operating, the chalk coating is preferred.
In the case, consider reflecting effect, the thickness of chalk is preferably 5 to 100 μ m.
Can in chalk, sneak into light diffusing agent for example resin microballon and glass microballoon, improve the light diffusion degree thus.
In addition, in second embodiment shown in Figure 7, it or not the recess 20 that is formed for light-emitting device in light conducting member 16 sides, but be formed for the recess 28 of light-emitting device, and between light-emitting device installation base plate 12 and light guide member 16, pass insulating barrier 21 formation one reflector 30 in light-emitting device installation base plate 12 sides.
In the present embodiment, on the upper surface of light-emitting device installation base plate 12, arrange a plurality of light-emitting devices 14 with pitches such as array pattern ground.But quantity of light-emitting device 14 (yet may have only a light-emitting device certainly) and configuration shape thereof are not subjected to concrete restriction, and can suitably change.For example, light-emitting device 14 can also be arranged with concentric circles or interlaced pattern.
Planar light source device 10 according to of the present invention as above-mentioned structure is used as for example advertising lamp of illuminator, illuminating lamp and backlight for liquid crystal display etc.For example, be used as under the situation of backlight for liquid crystal display at planar light source device, as shown in Figure 1, can be by on the upper surface of light guide member 16, constructing liquid crystal display via diffusion sheet and prismatic lens layout liquid crystal panel.
Fig. 8 is the vertical view according to the 3rd embodiment of planar light source device of the present invention that the LGP of using with good grounds another embodiment of the present invention is shown.Fig. 9 is the local enlarged cross-sectional view along the configuration of A-A line shown in Figure 8.
Because the configuration with Fig. 2 and planar light source device 10 shown in Figure 3 is identical substantially according to the configuration of the planar light source device 10 of present embodiment, has same reference numerals with the components identical that element is shown before, and no longer is described in greater detail.
As Fig. 8 and shown in Figure 9, for planar light source device 10 according to present embodiment, the position corresponding with light-emitting device 14 on the upper surface of light guide member 16 promptly comprising light-emitting device 14 towards its position to the section of upper process, forms circular semi-transparent part 32.
The shape of semi-transparent part 32 is not subjected to concrete restriction.Although semi-transparent in the present embodiment part 32 is circular, make the distance at any edge equate that the shape of semi-transparent part is not limited to above-mentioned shape from light-emitting device 14 to semi-transparent part 32.Although not shown, similar with the shape that is centered around near the zone 24 the light-emitting device 14, the shape of semi-transparent part can be ellipse, rectangle, triangle, arch, polygon or other shape.
In addition, semi-transparent part, promptly the neighboring from light-emitting device 14 to semi-transparent part as shown in Figure 9 sets for apart from d2, with the kind of the kind of the kind of light-emitting device 14 and brightness, light guide member 16 and thickness, reflector segment 22 and thickness and corresponding, make that brightness is almost even shown in the solid line of Fig. 4 apart from d1 from light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device 14.Above-mentionedly be not subjected to concrete restriction apart from d2.
For example, at light-emitting device 14 is under the situation of LED, light guide member 16 is that transparent resin plate and thickness are 3mm, reflector segment 22 is that whiting and thickness are 5 to 100 μ m, and the distance from light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device 14 is 40mm, from described light-emitting device apart from d2 preferably in 2 to 30mm scope.
In addition, semi-transparent part 32 is not subjected to concrete restriction, and can be by metallic film aluminium for example, gold, and silver, and platinum, or chalk is made.
At metallic film aluminium for example, gold, under the situation of silver and platinum, metallic film can be by for example deposition, sputter and the formation of electroless method.In addition, under the situation of chalk, for example can use the acrylic resin that comprises titanium dioxide, and this acrylic resin can use for example distributor and printing coating.
In said apparatus, consider operating characteristic, the coating of chalk is simple and be preferred.
Be under the situation that chalk makes at semi-transparent part 32 and reflector segment 22, the thickness of semi-transparent part 32 is adjusted to thin in the following manner, make the semi-transparent part of part light transmission, the film thickness of reflector segment 22 is adjusted to thick in the following manner, and making does not have the light transmission reflector segment.
By above-mentioned configuration, shown in the arrow D of Fig. 9, be positioned at the semi-transparent part 32 of light transmission of light guide member 16 upper surfaces directly over the light-emitting device 14 and weakened from light-emitting device 14 guiding, reduce the brightness of this section thus.
By above-mentioned configuration, shown in the solid line among Fig. 4, be positioned at section directly over the light-emitting device 14 around brightness compare reduction with existing backlight luminescence body and Fig. 2 with planar light source device 10 embodiment illustrated in fig. 3, obtain uniform brightness thus.
Figure 10 is the vertical view according to the 4th embodiment of planar light source device of the present invention, has wherein used light guide member according to another embodiment of the present invention.
Because the configuration with Fig. 2 and planar light source device 10 shown in Figure 3 is identical basically according to the configuration of the planar light source device 10 of present embodiment, has same reference numerals with the components identical that element is shown before, and no longer is described in greater detail.
In planar light source device 10, as shown in figure 10, on the bottom surface 18 of light guide member 16, be centered around and form light scattering dot pattern (lightscattering dot pattern) near the zone 24 the light-emitting device 14 according to present embodiment.
The light scattering dot pattern forms in this way and makes that the dot density of point-like reflector segment is lower in the zone near light-emitting device.
By as above-mentioned mode on the bottom surface 18 of light guide member 16, be centered around near the light-emitting device 14 the zone 24 and form dot pattern, can reduce in zone 24 that centers on light-emitting device 14 and the boundary diffusion intensity gap between the reflector segment 22.
But some printed patterns (dot printing pattern) is not subjected to concrete restriction, the point printed patterns can be a circular pattern, its center is the position that is positioned at directly over the light-emitting device 14, and wherein the diffusion intensity that makes progress from light guide member 16 is in the center of dot pattern minimum, bigger near the position of periphery.
This type of light scattering point can be by the scattering China ink the some printing or with the integrally moulded formation of light guide member 16.
The scattering China ink is not subjected to concrete restriction, and can use the China ink that for example comprises resin microballon or glass microballoon, or above-mentioned chalk.
In planar light source device 10 with configuration like this, be positioned at section directly over the light-emitting device 14 around brightness reduce, obtain uniform luminance thus.
Even in this case, in the 5th embodiment shown in Figure 11, also can be with similar according to the planar light source device 10 of Fig. 8 and embodiment shown in Figure 9, the position corresponding on the upper surface of light guide member 16 with light-emitting device 14, promptly the position directly over light-emitting device 14 forms circular semi-transparent part 32.
Although the light scattering dot pattern is formed on being centered around near the light-emitting device 14 the zone 24 on the bottom surface 18 of light guide member 16 in the present embodiment, also can on the bottom surface 18 of light guide member 16, form small (concavo-convex) uneven shape, to replace point-like shape control diffusion strength.
Figure 12 is the vertical view according to the 6th embodiment of planar light source device of the present invention, has wherein used light guide member according to another embodiment of the present invention.Figure 13 is the local enlarged cross-sectional view along the configuration of the A-A line of Figure 12.
Because the configuration with Fig. 2 and planar light source device 10 shown in Figure 3 is identical basically according to the configuration of the planar light source device 10 of present embodiment, and the element components identical is shown before has same reference numerals.
In Figure 12 and Figure 13, Reference numeral 10 is represented on the whole according to planar light source device of the present invention.
As shown in figure 13, planar light source device 10 according to the present invention is provided with light-emitting device installation base plate 12, and on the upper surface of light-emitting device installation base plate 12 mounting light emitting device 14 LED for example.
As shown in figure 12, on the upper surface of light-emitting device installation base plate 12 with etc. pitch arrange a plurality of light-emitting devices 14 with array pattern.
In addition, above the upper surface of light-emitting device installation base plate 12, arrange the light guide member of making by transparent resin etc. 16.As shown in figure 13, the position corresponding with light-emitting device 14 is formed for the recess 20 of light-emitting device on the bottom surface 18 of light guide member 16, and light-emitting device 14 is contained in the described recess 20 that is used for light-emitting device.
The shape that is used for the recess 20 of light-emitting device can suitably be revised as cheese, hemispherical, taper shape etc.On light-emitting device installation base plate 12, form the lead pattern of making by copper etc., control the light emission of light-emitting device 14 thus, although this does not illustrate in the drawings.
In addition, light guide member 16 is constructed by this way, makes the diffusion light intensity that makes progress that near around place, the bottom surface of light guide member 16 light-emitting device 14 the diffusion light intensity that makes progress is located less than light guide member 16 bottom surfaces that are provided with reflector segment 22 in its periphery section.
More specifically, in the present embodiment,, on the bottom surface 18 of LGP 16, near the zone being centered around light-emitting device 14, form the reflector segment 22 of function with reflection and diffused light as Figure 12 and shown in Figure 13.
In addition, as shown in figure 13, form semi-transparent part 11 being positioned on the recessed surface that position above the light-emitting device 14 is in the recess 20 that is used for light-emitting device, this semi-transparent part has the function of reflection and diffused light, wherein part light transmission (light transmittance: about 10% to 50%).
At this, " being positioned at the position of light-emitting device top " is meant relative light-emitting device 14 (comprising lens 13 under the lensed situation of formation) towards its zone to upper process, that is, the place, section directly over light-emitting device 14 comprises the zone of at least a portion.Figure 13 is corresponding with following situation: wherein semi-transparent part 11 is formed on the recessed surface of the recess 20 that is used for light-emitting device and the almost equal zone, whole zone that is positioned at directly over the light-emitting device 14 (lens 13).
But semi-transparent part 11 can place on the recessed surface of the recess that is used for light-emitting device 20 of light guide member 16 position corresponding with light-emitting device 14.More specifically, semi-transparent photosphere 11 can (needn't form this layer) not only as mentioned above in the position directly over the light-emitting device 14 on the whole surface directly over the light-emitting device, and can be formed on the bigger zone, zone that is arranged in the position directly over the light-emitting device 14 than comprising---wherein outwards penetrate from the recess that is used for light-emitting device 20 from the light of light-emitting device 14 emissions with by the light of semi-transparent part 11 diffusions and reflection.
In addition, wherein form the scope of semi-transparent part 11, promptly, neighboring from light-emitting device 14 to semi-transparent part 11 can set for apart from d3 as shown in figure 13, with the kind of the kind of the kind of light-emitting device 14 and brightness, light guide member 16 and thickness, reflector segment 22 and thickness, from light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device 14 apart from d1 and to be used for the shape of recess 20 of light-emitting device corresponding, make that brightness is almost even shown in the solid line of Fig. 4.Above-mentioned scope is not subjected to concrete qualification.
On light-emitting device 14, lens 13 are set in the section of the recess 20 that is used for light-emitting device of packing into.But, lens 13 can certainly be set.
As shown in figure 26, for existing planar light source device 300, as shown by arrow B, the light that sends from LED lamp 302 by in addition be centered around near the LED lamp 302 reflecting layer 312 reflections, and from the upper surface 314 of light guide member 306 with light by the upwards guiding of the mode of scattered reflection.
Therefore, shown in the dotted line that the length of Fig. 4 replaces, for existing planar light source device 300, many light penetrate from the upper surface 314 of light guide member 306 in the section that is positioned at directly over the LED lamp 302, and become higher in the section brightness that is positioned at directly over the LED lamp 302.
In contrast, for planar light source device 10, in light guide member 16, be used for forming semi-transparent part 11 on the recessed surface of recess 20 of light-emitting device according to present embodiment.Therefore, shown in Figure 13 (B), from light-emitting device 14 and wherein there are not light E1 that the section of semi-transparent part 11 sends upper surface 26 reflections at light guide member 16, shown in arrow E 2, and repeated reflection between the upper surface 26 of light guide member 16 and bottom surface 18.Then, light arrives reflector segment 22, shown in the arrow E 3 of Figure 13 (A), and diffusion and reflection takes place shown in the arrow C 1 to C3 of Figure 13 (A).At last, light spreads and upwards reflects from light guide member.
In addition, the light D that directly upwards sends from light-emitting device 14 is weakened by semi-transparent part 11.Therefore, the light that sends from the upper surface of light guide member 16 is weakened.
Therefore, the brightness that is positioned at the position directly over the light-emitting device 14 in light guide member 16 can be suppressed.
In addition, owing near around the light-emitting device on the bottom surface of light guide member 14, do not form reflector segment 22, shown in the arrow E 1 of Figure 13, the light that sends from light-emitting device 14 by light guide member 16 be centered around near the light-emitting device 14 bottom surface 18 regularly (fully) reflect, shown in arrow E 2, and only between the upper surface 26 of light guide member 16 and bottom surface 18, propagate.Light is not upwards guided by scattered reflection by the upper surface 26 from light guide member 16.
The light of the arrival reflector segment 22 shown in the arrow E among Figure 13 3 shown in arrow C 1 to C3 by scattered reflection from the light guide member diffuse reflection that makes progress.
By above configuration, as mentioned above, near the upwards diffusion intensity around place, the bottom surface of light guide member 16 light-emitting device 14 is provided with the intensity of the light guide member bottom surface of reflector segment 22 locating than in its peripheral section little.
By above configuration, shown in the dotted line of Fig. 4, to compare with existing backlight luminescence body, the brightness that is positioned at the section directly over the light-emitting device 14 reduces, and compares with existing backlight luminescence body, and the brightness outside this section increases, and improves brightness uniformity thus.
Although wherein do not form reflector segment 22 be centered around near the light-emitting device 14 zones 24 have in the present embodiment round-shaped, make any edge from light-emitting device 14 to this zone apart from homogeneous, shape that should the zone is not limited to above-mentioned shape.As shown in figure 14, this shape can be oval (Figure 14 (A)), rectangle (Figure 14 (B)), triangle (Figure 14 (C)), arch (Figure 14 (D)), polygon or other shape.
In addition, be centered around near the zone that does not wherein form reflector segment 22 24 the light-emitting device 14, promptly as shown in figure 13 from light-emitting device 14 can set for to the neighboring that is centered around near the zone 24 the light-emitting device 14 apart from d1, corresponding with the kind and the thickness of the kind of the kind of light-emitting device 14 and brightness, light guide member 16 and thickness, reflector segment 22, make that brightness is almost even shown in the solid line of Fig. 4.Above-mentioned distance is specifically restriction not.
For example, at light-emitting device 14 is under the situation of LED, light guide member 16 is that transparent resin plate and thickness are 3mm, and reflector layer 22 is that whiting and thickness are the 5-100 mu m range, can be about 40mm to the neighboring that is centered around near the zone 24 the light-emitting device apart from d1 from light-emitting device 14.
In addition, if the adjacent light-emitting device of a plurality of light-emitting device 14 in the heart distance be D, the distance from light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device is d, so, preferably D/4 is equal to or greater than d.
Although light-emitting device 14 is specifically restriction not,, for example, preferably use the backlight luminescence body of LED as liquid crystal display, this is because can realize gratifying colorrendering quality, high-speed response and high image quality.
Although monochromatic LED can be used as LED, but preferably use wherein combination that the unit light-emitting device of the multiple light-emitting device with different glow colors is arranged, for example, so-called three-in-one assembly---wherein use the led chip of red green blue tricolor, the led chip R that promptly glows, the led chip G of green light and the led chip B of blue light-emitting, and by mixing these colors generation white lights.
Even be used in combination multiple light-emitting device 14 for example under the situation of three-in-one type with different glow colors, as shown in figure 15, the shape that is centered around near the zone 24 of light-emitting device is corresponding with the layout shape of led chip, except being the circle in embodiment illustrated in fig. 12, can also be oval (Figure 15 (A)), rectangle (Figure 15 (B)), triangle (Figure 15 (C)), arch (Figure 15 (D)), polygon or other shape.
In the case, although it is not shown, the unit light-emitting device is except being the above-mentioned R that comprises, a G outside the unit of a B, can also be to comprise a R, the unit of two G and a B, or comprise two R, and the unit of two G and a B, and its combination is not subjected to concrete restriction.
In addition, the unit light-emitting device is not limited to three kinds of colors of above-mentioned RGB.For example, can on a substrate, install have so-called Neutral colour as yellow, orange, blue or green led chip to construct 4,5 or the led chip of more colors.
In addition, under the situation that light is propagated in light guide member 16, light guide member 16 is not subjected to concrete restriction, and for example acrylic resin, polycarbonate resin, liquid crystal polymer, polystyrene resin can be used for light guide member 16.
In addition, if semi-transparent part 11 has function and part light transmission in semi-transparent part 11 (light transmittance: about 10% to 50%) of reflection and diffused light, semi-transparent part 11 is not subjected to concrete restriction, and can be by metal forming such as aluminium foil, metallic film such as aluminium, gold, silver and platinum, or chalk is made.
In addition, if reflector segment 22 has the function of reflection and diffused light, reflector segment 22 is not subjected to concrete restriction, and can be made by for example chalk.
In addition, the rubber-like moulded parts that wherein is mixed with the diffusate of being made by titanium dioxide can be bonded in the inner surface of the recess 20 that is used for light-emitting device, can be printed on the inner surface of recess 20 of light-emitting device, maybe can form by spraying.
For example under the situation of aluminium foil, metal forming can bond by clear binder in metal forming.In addition, at metallic film aluminium for example, gold, under the situation of silver and platinum, metallic film can be by for example deposition, sputter and electroless plating formation.In addition, under the situation of chalk, for example, can use the acrylic resin that comprises titanium dioxide, and this acrylic resin can apply by distributor and printing.
In said method, consider operation characteristic, the coating of chalk is to be easy to and is preferred.
Under the situation that semi-transparent part 11 and reflector segment 22 are made by chalk, the film thickness of semi-transparent part 11 is adjusted into thin, makes the semi-transparent part of part light transmission, and the thickness of reflector segment 22 is adjusted into thickly, and making does not have the light transmission reflector segment.
Can in chalk, sneak into light diffusing agent for example resin microballon and glass microballoon, improve the light diffusion rate thus.
The shape that is used for the recess of light-emitting device 20 is not subjected to concrete restriction, and can be for example cone, pyramid, cylinder, prism or hemisphere.
Be provided with at light-emitting device 14 under the situation of lens 13, be transparent and have the situation on the surface of designated curvature that at lens 13 lens 13 are not subjected to concrete restriction.For example, lens 13 can be to be made by silicone resin or epoxy resin.
In addition, in the 7th embodiment shown in Figure 16, the recess 28 of light-emitting device can be formed for, and insulating barrier 21 formation reflectors 30 can be between light-emitting device installation base plate 12 and light guide member 16, passed in light-emitting device installation base plate 12 1 sides.
In the present embodiment, on the upper surface of light-emitting device installation base plate 12 with etc. pitch place a plurality of light-emitting devices 14 with array pattern.But, the quantity of light-emitting device 14 (certainly only using a light-emitting device) with and arrangement be not subjected to concrete restriction, and can suitably revise.For example, light-emitting device 14 also can be placed with concentric circles or interlaced pattern.
The planar light source device 10 of constructing as mentioned above according to the present invention is used as illuminator for example advertising lamp, illuminating lamp and backlight for liquid crystal display.For example, as under the situation of backlight for liquid crystal display, as shown in Figure 1, liquid crystal display can be constructed by place liquid crystal panel via proliferation part and prismatic lens on the upper surface of light guide member 16 at planar light source device.
Figure 17 is the vertical view that illustrates according to the 8th embodiment of planar light source device of the present invention, has wherein used light guide member according to another embodiment of the present invention.
Because the configuration with Fig. 2 and planar light source device 10 shown in Figure 3 is identical basically according to the configuration of the planar light source device 10 of present embodiment, has identical Reference numeral with previously described element components identical, and no longer is described in greater detail.
In planar light source device 10 according to the present invention, similar with the 4th embodiment as shown in figure 17, being centered around near the light-emitting device 14 the zone that does not wherein form reflector segment 22 24 on the bottom surface 18 of light guide member 16 forms the light scattering dot pattern.
The light scattering dot pattern forms in the following manner, makes that the dot density of reflector segment of point-like shape is lower than the density of the section of close light-emitting device.
By forming above-mentioned dot pattern, reduce being centered around near the light-emitting device 14 the zone 24 and the intensity gap of the boundary between the reflector segment 22.
But the point-like printed patterns is not subjected to concrete restriction, the point-like printed patterns is a circular pattern, its center is the position that is positioned at directly over the light-emitting device 14, and the diffusion intensity that wherein makes progress from light guide member 16 is minimum at the center of dot pattern, bigger near the position of periphery.
This type of light scattering point can be shaped by the some printing of scattering China ink or with the integrally moulded of light guide member 16.
The scattering China ink is not subjected to concrete restriction, and can use the China ink that for example comprises resin microballon or glass microballoon, or above-mentioned chalk.
In the planar light source device 10 with this type of configuration, the brightness that is positioned at around the section directly over the light-emitting device 14 reduces, and obtains uniform brightness thus.
Although the light scattering dot pattern is formed near the zone 24 that is centered around on the bottom surface 18 of light guide member 16 light-emitting device 14 in the present embodiment, also can on the bottom surface 18 of light guide member 16, form small (concavo-convex) uneven shape, to substitute point-like shape control intensity.
Embodiment
(embodiment 1)
The unit light-emitting device places on the light-emitting device installation base plate 12 of horizontal 115mm * vertical 135mm with array pattern as shown in Figure 2, and wherein the led chip of the red, green, blue of 1W level is combined as light-emitting device 14.
The transparent panel of the horizontal 115mm that is made by acrylic resin * vertically 135mm, thick 3mm is as light guide member 16.
Forming radius in the position directly over the center of each light-emitting device 14 on the bottom surface 18 of light guide member 16 is the hemispheric recess 20 that is used for light-emitting device of 2.5mm.
The whiting of being made by the acrylic resin that comprises 50% titanium dioxide (only solid matter) by spray coating on the bottom surface 18 of light guide member 16 makes that thickness is 100 μ m, forms reflector segment 22 thus.
In the case, reflector segment 22 is formed in the zone near being centered around light-emitting device 14 the zone 24.Near the zone 24 that is centered around the light-emitting device forms in the following manner, is 40mm (referring to Figure 18) from the center of light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device apart from d1 promptly.
Distance D between the adjacent light-emitting device 14 is 180mm.
By the fixing transparent panel of making by acrylic resin of lamination by this way, make the recess 20 that is used for light-emitting device towards light-emitting device 14, obtain thus according to planar light source device 10 of the present invention (referring to Fig. 3).
Subsequently, to red LED, green LED and blue LED apply 280mA (red) respectively, 360mA (green), the electric current of 120mA (indigo plant).
Thus, utilize spectral radiometer CS-1000A (by Konica Minolta, Inc. makes), measure relative brightness with the pitch of along continuous straight runs 0.5cm in the distance of the position O 0.5mm on the upper surface of diffuser plate.When measuring relative brightness, diffuser plate PC9391-50HLW (being produced by TEIJINLIMITED.) places the 25mm place, top according to resin light guide member of the present invention.
Measured result is in shown in the curve map of table 1 and Figure 23.
(embodiment 2)
Planar light source device 10 as shown in figure 19 according to the present invention obtains in the mode of similar embodiment 1, except following aspect.
More specifically, as Fig. 8 and shown in Figure 9, the position corresponding on the upper surface of light guide member 16 with light-emitting device 14, that is, the position being positioned at directly over the light-emitting device 14 further is formed with circular semi-transparent part 32.
On the surface area of light guide member, apply the whitewash of making by the acrylic resin that comprises 50% titanium dioxide (only solid matter) with spraying method, make that thickness is 20 μ m, form semi-transparent part 32 thus, wherein the neighboring from light-emitting device 14 to semi-transparent part 32 is 5mm apart from d2.
Thus, then similar to Example 1, measuring relative brightness from the distance that is positioned at the position O 0.5mm directly over the light-emitting device 14 on the upper surface of diffuser plate with the pitch of along continuous straight runs 0.5cm.
Measured result is in shown in the curve map of table 1 and Figure 23.
(embodiment 3)
Planar light source device 10 as shown in figure 20 according to the present invention obtains in the mode of similar embodiment 1, except following aspect.
More specifically, on the recessed surface of the recess 20 that is used for light-emitting device, form semi-transparent part 11.
Apply the whitewash of making by the acrylic resin that comprises 50% titanium dioxide by spraying method, make that thickness is 20 μ m, forms semi-transparent part 11 thus.
Wherein form the scope of semi-transparent part 11, that is, the projector distance d3 from the center of light-emitting device 14 to the neighboring of semi-transparent part 11 is about 1.8mm, makes that the led chip of red, green and blue is capped substantially as shown in figure 20.
The whitewash of being made by the acrylic resin that comprises 50% titanium dioxide by spray coating on almost whole of the bottom surface 18 of light guide member 16 makes that thickness is 200 μ m, forms reflector segment 22 thus.
In the case, reflector segment 22 is formed in the zone near being centered around light-emitting device 14 the zone 24.Near the zones 24 that are centered around the light-emitting device 14 are to form by such mode, make to be 40mm (referring to Figure 20) from the center of light-emitting device 14 to the neighboring that is centered around near the zone 24 the light-emitting device apart from d1.
Then, the fixing transparent panel of being made by acrylic resin of lamination makes the recess 20 that is used for light-emitting device towards light-emitting device 14, obtains thus according to planar light source device 10 of the present invention (referring to Figure 13).
Subsequently, apply the electric current of 280mA (red), 360mA (green) and 120mA (indigo plant) respectively to red LED, green LED and blue LED.
Thus, then, measuring relative brightness with the pitch of horizontal direction 0.5cm from the distance that is positioned at the position O 0.5mm directly over the light-emitting device 14 on the upper surface of diffuser plate.
Measured result is in shown in the curve map of table 1 and Figure 23.
(comparative example 1)
Planar light source device 10 as shown in figure 21 obtains in the mode of similar embodiment 1, except following aspect.
More specifically, as shown in figure 21, on whole of the bottom surface 18 of light guide member 16, except the recess 20 that is used for light-emitting device, apply the whitewash of making by the acrylic resin that comprises 50% titanium dioxide (only solid matter) with spraying method, make that thickness is 100 μ m, forms reflector segment 22 thus.In the case, do not form near the zone that does not wherein form reflector segment 22 24 light-emitting device of being centered around of circle similar to Example 1 in fact, and only form little circle disappearance part 34, this disappearance part is corresponding with the recess 20 that is used for light-emitting device, and diameter is that 5mm is corresponding with the size of light-emitting device 14.
Thus, then, measuring relative brightness with the pitch of along continuous straight runs 0.5cm from the distance that is positioned at the position O 0.5mm directly over the light-emitting device 14 on the upper surface of diffuser plate.
Measured result is in shown in the curve map of table 1 and Figure 23.
(comparative example 2)
Planar light source device 10 as shown in figure 22 obtains in the mode of similar embodiment 1, except following aspect.
More specifically, as shown in figure 22, on whole of the bottom surface 18 of light guide member 16, except the recess 20 that is used for light-emitting device, apply the whitewash of making by the acrylic resin that comprises 50% titanium dioxide (only solid matter) with spraying method, make that thickness is 100 μ m, forms reflector segment 22 thus.In the case, do not form near the zone that does not wherein form reflector segment 22 24 light-emitting device of being centered around of circle similar to Example 1 in fact, and only form little circle disappearance part 34, this disappearance part is corresponding with the recess 20 that is used for light-emitting device, and diameter is that 5mm is corresponding with the size of light-emitting device 14.
On the upper surface of light guide member, with the neighboring from light-emitting device 14 to semi-transparent part 32 apart from d2, apply the whitewash of making by the acrylic resin that comprises 50% titanium dioxide (only solid matter) with spraying method, make that thickness is 20 μ m, forms semi-transparent part 32 thus.In the case, semi-transparent part 32 forms like this, makes semi-transparent part be of a size of diameter 4mm, less than above-mentioned disappearance part 34 (referring to Figure 22).
Thus, then, measuring relative brightness with the pitch of along continuous straight runs 0.5cm from the distance that is positioned at the position O 0.5mm directly over the light-emitting device 14 on the upper surface of diffuser plate.
Measured result is in shown in the curve map of table 1 and Figure 23.
Table 1
| Distance (cm) | |
|
|
Comparative example 1 | Comparative example 2 |
| 0 | 100 | 100 | 100 | 100 | 100 |
| 0.5 | 95.1 | 98 | 100 | 96.6 | 101.6 |
| 1 | 90.3 | 95.3 | 100 | 87.9 | 93 |
| 1.5 | 84.2 | 91 | 96.3 | 77.9 | 77.2 |
| 2 | 75.8 | 85.4 | 90.8 | 67.5 | 64.6 |
| 2.5 | 66 | 77.3 | 85.1 | 57 | 52.5 |
| 3 | 57.4 | 70 | 77.5 | 48 | 40.4 |
| 3.5 | 49.4 | 61 | 70 | 40 | 32.8 |
| 4 | 42 | 54.6 | 60.7 | 35 | 28 |
| 4.5 | 37.8 | 48.7 | 54.8 | 31 | 24.2 |
| 5 | 33.1 | 44 | 48 | 27 | 21.6 |
By table 1 and Figure 23, can find that for the planar light source device of (embodiment) according to the present invention, compare with comparative example, the relative brightness that is positioned at outside the position directly over the light-emitting device 14 increases, and can obtain uniform luminance.In addition, also improved the blend of colors of RGB.
Although described the preferred embodiments of the present invention above, the present invention is not limited only to the foregoing description, and can carry out variations and modifications thus under the prerequisite that does not deviate from scope of the present invention.For example, although light guide member according to the present invention is useful with planar light source device for a plurality of light-emitting devices that installation has different glow colors, the white luminous device that does not require blend of colors can be installed also.
Claims (16)
1. light guide member, this light guide member be arranged on the upper surface of the light-emitting device installation base plate that light-emitting device is installed and be used for diffusion and upwards guiding comprise from the light of light-emitting device emission:
On the bottom surface of light guide member not around the described light-emitting device near the reflector segment of position formation; And
One section in this section, does not form reflector segment near the position that is centered around the described light-emitting device on the bottom surface of light guide member.
2. light guide member as claimed in claim 1 is characterized in that, also comprises:
Be arranged in the described light-emitting device recess of the described light guide member position corresponding with described light-emitting device; And
Be positioned at described light-emitting device with the semi-transparent part on the part on the recessed surface of recess.
3. light guide member as claimed in claim 2 is characterized in that, recessed lip-deep described semi light transmitting part divides formation on the throne in the position of described light-emitting device top.
4. as each described light guide member in the claim 1 to 3, it is characterized in that being centered around near the zone of described light-emitting device is apart from the equidistant zone of described light-emitting device.
5. as each described light guide member in the claim 1 to 4, it is characterized in that also comprise being positioned at the point-like reflector segment that is centered around near the zone of described light-emitting device, the dot density of wherein said reflector segment is lower than the section near described light-emitting device.
6. light guide member as claimed in claim 1 is characterized in that, also comprises the semi-transparent part of the position corresponding with described light-emitting device on the upper surface that is positioned at described light guide member.
7. light guide member as claimed in claim 6 is characterized in that, described semi light transmitting part branch is formed on the position directly over the described light-emitting device of being positioned on the upper surface of described light guide member.
8. light guide member as claimed in claim 7 is characterized in that, described semi light transmitting part branch be formed on the upper surface of described light guide member be centered around near the described light-emitting device from the position of described light-emitting device apart from homogeneous.
9. as each described light guide member in the claim 1 to 8, it is characterized in that, be installed in a plurality of light-emitting device dispersed placement on the light-emitting device installation base plate, and be centered around a plurality of positions corresponding that near the zone that does not wherein form reflector segment of described light-emitting device is arranged on the light guide member bottom surface with described light-emitting device.
10. light guide member as claimed in claim 9, it is characterized in that, D/4 is equal to or greater than d, distance in wherein a plurality of light-emitting devices between the adjacent light-emitting device is D, and the homogeneous distance from described light-emitting device to the neighboring that is centered around near the zone that does not wherein form reflector segment the described light-emitting device is d.
11. as each described light guide member in the claim 1 to 10, it is characterized in that, the light-emitting device that is installed on the light-emitting device installation base plate is constructed by the unit light-emitting device that wherein makes up the multiple light-emitting device that has different glow colors, and is centered around zone that does not wherein form reflector segment and the corresponding formation of described unit light-emitting device near the described light-emitting device.
12. as each described light guide member in the claim 2 to 5, it is characterized in that, the light-emitting device that is installed on the light-emitting device installation base plate is constructed by the unit light-emitting device that wherein makes up the multiple light-emitting device that has different glow colors, and described light-emitting device recess and the corresponding formation of described unit light-emitting device.
13. a planar light source device wherein is arranged on the upper surface of the light-emitting device installation base plate that light-emitting device is installed as each described light guide member in the claim 1 to 12.
14. planar light source device as claimed in claim 13 is characterized in that, described light-emitting device is a light emitting diode.
15. a display device comprises the display part that places as on the upper surface of claim 13 or 14 described planar light source devices.
16. display device as claimed in claim 15 is characterized in that, described display part is a liquid crystal panel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005345782 | 2005-11-30 | ||
| JP345782/2005 | 2005-11-30 | ||
| JP080377/2006 | 2006-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102952843A Division CN102003683A (en) | 2005-11-30 | 2006-11-27 | Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device |
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| CN101321986A true CN101321986A (en) | 2008-12-10 |
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|---|---|---|---|
| CNA2006800451245A Pending CN101321986A (en) | 2005-11-30 | 2006-11-27 | Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device |
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