TWI824121B - Light source device - Google Patents

Abstract

A light source device includes a plurality of light sources arranged in a matrix, a substrate, and a reflective member. The reflective member includes first walls defining a first region entirely surrounded by the first walls in a plan view, and second walls located on an outer side of the first walls, the second walls defining a second region and a third region each only partially surrounded by the second walls in the plan view such that an area of the second region is equal to or greater than a half of an area of the first region and an area of the third region is less than the half of the area of the first region in the plan view. The light sources are disposed respectively in the first region and in the second region while none of the light sources is disposed in the third region.

Description

Light source device

The invention relates to a light source device.

As a backlight used in direct downward illumination for LCD televisions, vehicle-mounted instruments, etc., a surface-emitting type light source device is known. For example, as an example of a surface-emitting light source device, there is a light source device described in Patent Document 1. This kind of light source device has reflective peripheral walls around a plurality of light sources, and has a frame arranged in a matrix. This divides the light-emitting area and prevents light from leaking outside the area.

[Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2013-25945

However, especially vehicle-mounted instruments and the like have irregular planar shapes, so their outer peripheral ends The light sources may not be arranged regularly, and the brightness within the plane may not be uniform.

The present invention was completed in view of the above-mentioned problems, and provides a light source device that can make the brightness uniform within the plane when it has an irregular planar shape.

This application includes the following inventions.

A light source device including: a plurality of light sources; a substrate on which the plurality of light sources are arranged in a matrix; a reflective member including a first wall portion respectively surrounding the light sources; and a reflective member provided outside the first wall portion. A second wall portion having an opening on the outside; the area surrounded by the second wall portion has a second area and a third area, and the second area has an area of more than half of the first area surrounded by the first wall portion. area, the third area has an area less than half of the area of the first area; the light source is arranged in the second area, and the light source is not arranged in the third area.

According to the light source device according to an embodiment of the present invention, when it has an irregular planar shape, the brightness can be made uniform within the plane.

2: Covered component

3:Joining components

4A, 4B: Wiring layer

5:Sealing components

5a: Underfill

6:Light reflective film

7:Light-emitting components

8:Substrate

9:Light source

10: Reflective component

10c: Bottom

11: 1st wall

11R: Area 1

12: 2nd wall

12R:Zone 2

13R: Region 3

14: Diffusion plate

20: Reflective components

22: Diffusion piece

23:Wavelength converter

24:稜鏡片

25:Polarizer

26:Coated substrate

27:Exterior substrate

28: Adhesion layer and/or reflective layer

29: Adhesion layer and/or reflective layer

30: Reflective component

31: Adhesion layer and/or reflective layer

32:Through hole

40: Reflective component

B,B': section line

J: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

K: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

L: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

M: Width of the 1st wall and/or 2nd wall

N: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

OD: height

P: distance between the first wall and/or the second wall

Q: The upper and lower sides are parallel to each other or the left and right sides are parallel to each other.

W: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

α: Angle of the top

γ: Angle of wall

FIG. 1A is a schematic top view of a light source device according to an embodiment of the present invention.

Figure 1B is a cross-sectional view taken along line AA' of Figure 1A.

Figure 1C is a cross-sectional view along line BB' of Figure 1A.

FIG. 1D is a partial enlarged schematic cross-sectional view of the periphery of the first wall in FIG. 1A .

1E is a schematic exploded perspective view of a light source device according to an embodiment of the present invention.

FIG. 1F is a schematic cross-sectional view of a main part of the light source device including a part of the components shown in FIG. 1E .

FIG. 2A is a partial enlarged schematic cross-sectional view of the periphery of the light-emitting element of the light source device of FIG. 1A.

FIG. 2B is a diagram showing the batwing light distribution characteristics of the light-emitting element of the light source device of FIG. 1A .

3A is a schematic top view of a light source device according to another embodiment of the present invention.

3B is a schematic top view of a light source device according to another embodiment of the present invention.

3C is a schematic top view of a light source device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with appropriate reference to the drawings. However, the embodiments described below are for embodying the technical idea of the present invention, and the present invention is not limited to the following unless otherwise specified. In addition, the content described in one embodiment and Example can also be applied to other embodiments and Examples. In order to explain clearly, the size, positional relationship, etc. of the components shown in each drawing are sometimes exaggerated.

In this embodiment, the light extraction surface side of the light source of the light source device may be called an upper surface or an upper side. In addition, unless otherwise specified, the center side of the light source device, the substrate and/or the reflective member in a plan view is called the inner side, and the side opposite to the center is called the outer side.

As shown in FIGS. 1A to 1F , a light source device according to an embodiment of the present invention includes a plurality of light sources 9 , a substrate 8 on which the plurality of light sources 9 are arranged, and a reflective member 10 . This kind of light source device serves as a surface The luminescent light source device functions. The reflective member 10 includes a first wall 11 surrounding each light source 9 and a second wall 12 having an opening outside the first wall 11 . The reflective member 10 has a first region 11R that is a region surrounded by the first wall portion 11 and a second region that is an area that is more than half of the area of the first region 11R among the regions surrounded by the second wall portion 12 . 2 regions 12R, and a third region 13R having an area smaller than half of the area of the first region 11R. The light source 9 is arranged in the second area 12R, and the light source 9 is not arranged in the third area 13R.

By having this structure, even if the light source device has an irregular plane shape, the brightness within the plane can be made uniform.

(Light source 9)

The light source 9 is a member that emits light, such as a light-emitting element itself that emits light, a light-emitting element sealed with a translucent resin, or a surface-mounted light-emitting device (also called LED (Light)) with a light-emitting element packaged therein. -emitting diode, light-emitting diode)), etc. The plurality of light sources 9 is preferably arranged regularly on the substrate 8 in vertical and horizontal directions, columns and rows, or a matrix. In this way, the brightness within the surface can be made uniform. That is, the plurality of light sources 9 are preferably arranged regularly in columns and rows as shown in FIG. 1A , or they can be regularly arranged in the column direction as shown in FIG. 3C , and the light sources in adjacent columns are arranged in the row direction. The 9 light sources 9 are shifted in the column direction by an amount (length) equivalent to half of the light sources 9 and are arranged regularly.

For example, as the light source 9 , as shown in FIG. 2A , the light emitting element 7 is covered with the sealing member 5 . The light source 9 may use one light-emitting element 7, or may use a plurality of light-emitting elements 7 as one light source.

The light source 9 may have any light distribution characteristics, but in order to reduce brightness unevenness and emit light in each area surrounded by the wall portion of the reflective member 10 described below, a wide-angle light distribution is preferred. Especially good for each light source 9 It has bat-wing light distribution characteristics as shown in Figure 2B. This suppresses the amount of light emitted directly above the light source 9, expands the light distribution of each light source, and causes the expanded light to irradiate the reflective member 10, thereby suppressing uneven brightness in each area surrounded by the wall.

The so-called batwing light distribution characteristic here is defined as a luminous intensity distribution with a luminous intensity stronger than 0° at an angle where the absolute value of the light distribution angle is greater than 0°, with the optical axis L being 0°. In addition, the optical axis L is defined as a line that passes through the center of the light source 9 and perpendicularly intersects a line on the plane of the substrate 8 described below, as shown in FIG. 2A .

In particular, as the light source 9 having batwing light distribution characteristics, for example, a light-emitting element 7 having a light reflective film 6 on the upper surface is used as shown in FIG. 2A . Thereby, the light in the direction above the light-emitting element 7 is reflected by the light reflective film 6, and the amount of light directly above the light-emitting element 7 is suppressed, so that bat-wing light distribution characteristics can be obtained. Since the light reflective film 6 can be directly formed on the light-emitting element 7, there is no need to combine a special lens to form a batwing-shaped light distribution, thereby reducing the thickness of the light source 9.

The light reflective film 6 formed on the upper surface of the light-emitting element 7 may be a metal film such as silver or copper, a dielectric multilayer film (DBR, Distributed Bragg Reflector film), or any combination thereof. The light reflective film 6 preferably has reflectivity angle dependence on the incident angle with respect to the emission wavelength of the light emitting element 7 . Specifically, the reflectivity of the light reflective film 6 is preferably set so that oblique incidence is lower than perpendicular incidence. Thereby, the change in brightness directly above the light-emitting element is slowed down, and it is possible to prevent the light-emitting element from becoming extremely dark such as a dark spot directly above it.

The light source 9 may be, for example, a light-emitting element 7 directly mounted on the substrate with a height of 100 μm to 500 μm. For example, the thickness of the light reflective film 6 is 0.1 μm to 3.0 μm. Even if the sealing member 5 described below is included, the thickness of the light source 9 can be approximately 0.5 mm to 2.0 mm.

It is preferred that the plurality of light sources 9 can be driven independently of each other, and be mounted on the device in a manner that allows dimming control of each light source (such as local dimming or HDR (High Dynamic Range, High Dynamic Range)). on the following substrate 8.

(Light-emitting element 7)

As the light-emitting element 7, a known one can be used. For example, it is preferable to use a light-emitting diode as a light-emitting element. The light-emitting element can be of any wavelength. For example, as blue and green light-emitting elements, those using nitride-based semiconductors can be used. In addition, as the red light-emitting element, GaAlAs, AlInGaP, etc. can be used. Furthermore, a semiconductor light-emitting element made of other materials may also be used. The composition, luminous color, size, number, etc. of the light-emitting elements used can be appropriately selected according to the purpose.

The light-emitting element 7 may be flip-chip mounted via the bonding member 3 in a manner that spans a pair of positive and negative wiring layers 4A and 4B provided on the upper surface of the substrate 8 as shown in FIG. 2A . However, the light-emitting element 7 can be not only flip-chip mounted, but also face-up mounted. The bonding member 3 is a member for fixing the light-emitting element 7 to a substrate or a conductor wiring, and examples thereof include insulating resin, conductive members, and the like. In the case of flip-chip mounting as shown in Figure 2A, conductive components are used. Specifically, examples include Au-containing alloys, Ag-containing alloys, Pd-containing alloys, In-containing alloys, Pb-Pd-containing alloys, Au-Ga-containing alloys, Au-Sn-containing alloys, Sn alloys, Sn-Cu-containing alloys, Sn-Cu-Ag-containing alloys, Au-Ge-containing alloys, Au-Si-containing alloys, Al-containing alloys, Cu-In-containing alloys, metals and fluxes mixtures, etc.

(Sealing member 5)

The sealing member 5 covers the light-emitting element to protect the light-emitting element from external environment, optically controls light output from the light-emitting element, and the like. The sealing member 5 is formed of a translucent material. As its material, epoxy resin, silicone resin or translucent resin or glass mixed with these resins can be used. Li et al. Among these, silicone resin is preferably used in view of light resistance and ease of formability. The sealing member 5 may also include wavelength conversion materials such as phosphors that absorb light from the light-emitting element and emit light with a wavelength different from the output light from the light-emitting element, a diffusing agent for diffusing the light from the light-emitting element, and Colorant corresponding to the luminous color of the light-emitting element, etc.

As the phosphor, diffusing agent, coloring agent, etc., those known in the field can be used.

The sealing member 5 may be in direct contact with the substrate 8 .

The sealing member 5 is adjusted to a viscosity that enables printing, dispenser coating, etc., and can be hardened by heat treatment or light irradiation. The shape of the sealing member 5 may be, for example, a substantially hemispherical shape, a convex shape that is longitudinally long when viewed in cross section (a shape in which the length in the Z direction is greater than the length in the X direction when viewed in cross section), or a flat convex shape when viewed in cross section ( When viewed in cross section, the length in the X direction is greater than the length in the Z direction), and it has a circular or elliptical shape when viewed from above.

The sealing member 5 may also be disposed as an underfill 5 a between the lower surface of the light-emitting element 7 and the upper surface of the substrate 8 .

(Substrate 8)

The substrate 8 is a member for arranging a plurality of light sources 9. As shown in FIG. 2A, the substrate 8 has wiring layers 4A and 4B on its upper surface for supplying power to the light sources 9 such as the light emitting element 7. It is preferable that the covering member 2 covers the areas of the wiring layers 4A and 4B that are not electrically connected.

The material of the substrate 8 may be any material that can insulate and separate at least a pair of wiring layers 4A and 4B. For example, ceramics, resins, composite materials, etc. can be mentioned. Examples of ceramics include alumina, mullite, silicate, glass ceramics, nitride systems (such as AlN), carbide systems (such as SiC), LTCC (Low Temperature Co-fired Ceramic), and low temperature co-fired ceramics. Ceramics) etc. Examples of the resin include phenolic resin, epoxy resin, polyimide resin, bismaleimide-triazine resin (BT Resin, Bismaleimide-Triazine Resin), polyphthalamide (PPA), Polyethylene terephthalate (PET), etc. Examples of composite materials include those in which the above-mentioned resin is mixed with inorganic fillers such as glass fiber, SiO ₂ , TiO ₂ , and Al ₂ O ₃ , glass fiber-reinforced resin (glass epoxy resin), and an insulating layer formed in a metal member. metal substrates, etc.

The thickness of the substrate 8 can be appropriately selected and can be either a flexible substrate or a rigid substrate that can be manufactured in a roll-to-roll manner. The hard substrate may be a thin hard substrate that can be bent.

The wiring layers 4A and 4B can be formed of any material as long as they are conductive members, and they can generally be used as wiring layers for circuit boards and the like. A coating film, a light reflective film, etc. may also be formed on the surface of the conductor wiring.

The covering member 2 is preferably formed of an insulating material. Examples of the material include the same materials as those exemplified as the substrate material. By using the resin containing a white filler or the like as the covering member, leakage or absorption of light can be prevented, thereby improving the light extraction efficiency of the light source device.

(Reflective member 10)

The reflective member 10 has a first wall part 11 and a second wall part 12 surrounding each light source 9 .

The first wall portion 11 is preferably arranged so that each light source 9 arranged on the substrate is located near the center (or center of gravity), and more preferably is arranged so as to be located at the center (or center of gravity). For example, the first wall portion 11 may have a frame shape such as a polygon such as a quadrilateral or a hexagon, a circle, or an ellipse when viewed from above. Among them, a quadrilateral lattice shape as shown in Figure 1A is preferred, a hexagonal frame shape as shown in Figure 3C is more preferred, and a quadrilateral, especially square lattice shape is more preferred. Therefore, the first wall portion 11 defines a plurality of regions of specific shapes, that is, the first region 11R by the above-mentioned frame-shaped wall. The shape of the area formed by the reflecting member 10 surrounding the light source 9, that is, the shape of the first area 11R defined by the first wall portion 11 can be, for example, a circle, an ellipse, etc., a quadrangle, a hexagon, etc. when viewed from above. many Polygons etc. Among them, a polygon is preferred, and a quadrilateral is particularly preferred. This makes it easy to define an arbitrary number of light-emitting areas by the first wall portion 11 according to the area of the light-emitting surface of the surface light source device, so that the light-emitting areas can be arranged at a high density. It is preferable that the first region 11R defined by the first wall portion 11 is regularly defined. The number of the first regions 11R defined by the first wall portion 11 can be set arbitrarily, and can be appropriately adjusted according to the required size of the light source device. Furthermore, the first regions 11R may have partially different sizes and/or shapes, but it is preferable that the plurality of first regions 11R all have the same size and the same shape.

In other words, it is preferable that the first wall portions 11 in the reflective member 10 are connected and arranged in a frame shape so that the first regions 11R respectively surrounding the light source 9 are regularly arranged vertically and horizontally, in rows, and in a matrix.

The second wall portion 12 defines at least one second region 12R and a third region 13R that are specific-shaped regions, preferably one or more, and preferably each defines a plurality of them. The second wall portion 12 is arranged outside the first wall portion 11 in the reflective member 10 and has an opening outside the reflective member 10 , that is, outside the light source device. The opening here may be a part open in the height direction of the second wall part 12, but is preferably a part open in the entire height direction of the second wall part 12. In addition, the outer side of the first wall portion refers to the outer side of the first side wall close to the outer periphery of the reflective member 10 in a plan view, as shown in FIG. 1A . The outer side of the first wall further refers to the through-hole 32 side of the first wall that is close to the through-hole 32 when the reflective member 10 has the through-hole 32 inside the outermost circumference in a plan view as shown in FIG. 3B .

In other words, in the reflection member 10 , the second wall portion 12 is arranged outside the first wall portion 11 and is connected to the first wall portion 11 so as to constitute a part of the frame.

The area surrounded by the second wall portion 12, that is, the area defined by the second wall portion 12 is called a second area 12R or a third area 13R. 2nd area 12R, 3rd area 13R and 1st area 11R The shape is different and has a shape in which part of the shape of the first region 11R is missing when viewed from above. In particular, the second region 12R has an area that is more than half of the area of the first region 11R surrounded by the first wall portion 11 . The third region 13R has an area smaller than half of the area of the first region 11R. In other words, the second region 12R is a region corresponding to the center or center of gravity of the first region 11R and has an area that is more than half of the area of the first region 11R, and the third region 13R is a region corresponding to the center or center of gravity of the first region 11R. An area located at the center or center of gravity of the first area 11R and having an area less than half of the area of the first area 11R. Furthermore, in other words, the second region 12R has a region corresponding to the center or the center of gravity of the first region 11R, and the third region 13R does not have a region corresponding to the center or the center of gravity of the first region 11R.

The planar shapes of the second region 12R and the third region 13R can be appropriately set based on, for example, the planar shape of the first region 11R, the planar shape of the reflective member 10 , a display device such as an instrument using the light source device, and the like. When there are a plurality of second areas 12R and a plurality of third areas 13R, they may all be the same, or may be completely or partially different. Thereby, an irregular-shaped light source device suitable for the shape of an instrument can be produced, and the light source device itself can be miniaturized. For example, the following various shapes can be exemplified: a region formed by cutting a first region 11R defined by the first wall portion 11 at an arbitrary position parallel to one side (refer to the N portion in FIG. 1A and FIGS. 3A to 3C ); A region formed by cutting a first region 11R defined by the first wall portion 11 at a position inclined at an arbitrary angle with respect to one side (refer to parts J, W, and L in FIG. 1A and FIGS. 3A to 3C ); A first region 11R defined by the first wall 11 is an area formed by cutting an arbitrary curve and a straight line (refer to the K part in FIG. 1A and FIGS. 3A-3B); and 1 defined by the first wall 11 A region formed by cutting the first region 11R along an arbitrary curve, etc.

The light source 9 is arranged in the second area 12R, and no light source is arranged in the third area 13R. As above As described above, when there is a region corresponding to the center or the center of gravity of the first region 11R in the second region 12R, the light source 9 is arranged in or near the region corresponding to the center or the center of gravity. Furthermore, when there is no area corresponding to the center or center of gravity of the first area 11R in the second area 12R, but there is an area having an area of more than half of the area of the first area 11R, the light source 9 does not need to be arranged.

The third area 13R, that is, the area partially surrounded by the second wall 12 and in which the light source 9 is not arranged, is discontinuous up and down, left and right, or diagonally upward (refer to J, W, K, N in Fig. 1A and Figs. 3A to 3C , L part, etc.). In this way, when irregular reflective members are used, there are no darker areas at their ends, and uneven brightness within the plane can be effectively prevented.

In a plan view, the reflective member 10 forms an upper and lower side that are parallel to each other or a left and right side that are parallel to each other through the first wall portion 11 (refer to Q in FIG. 1A and FIGS. 3A to 3C ), and through the second wall portion 12 and the second area 12R or the third region 13R constitutes an edge that is inclined or curved with respect to the upper and lower sides or the left and right sides formed by the first wall portion 11 or the first region 11R (refer to J, W, K, N in Fig. 1A and Figs. 3A to 3C , L, etc.). The inclination and bending here can be appropriately set according to the size and configuration of the light source 9, the purpose of the light source device, etc. That is, when the outer periphery of the reflective member 10 has sides parallel to each other in the up-down and/or left-right directions (refer to part Q in FIG. 1A and FIGS. 3A to 3C ), the first wall portion 11 may be arranged to form the sides. situation, but the second wall portion 12 does not constitute the outer periphery of the reflective member, and the second region 12R or the third region 13R together with the first wall portion 11 constitute the outer periphery of the reflective member 10 (refer to Figure 1A and Figures 3A to 3C (J, W, K, N, L parts, etc.).

It is preferable that the first wall portion 11 and the second wall portion 12 form the boundary of an adjacent area when viewed in cross section, and have an inclination extending upward toward the light source 9 . The angle of the wall (γ in FIG. 1D) can be, for example, 45° to 75°.

The upper ends of the first wall portion 11 and the second wall portion 12 may be flat, and preferably have a prismatic shape composed of at least two wall portions surrounding adjacent areas. In other words, as shown in FIG. 1A and others, it is preferable that the longitudinal sections of at least two wall portions constituting the top form an acute-angled triangle, and more preferably, they form an acute-angled isosceles triangle. The acute angle of an acute-angled triangle or an acute-angled isosceles triangle, that is, the angle of the top (α in Figure 1D) is preferably set to 30° to 90°, for example. By setting this range, the space and area occupied by the reflective member 10 can be reduced, the height of the reflective member 10 can be reduced, and the light source device can be miniaturized and thinned.

The width of the first wall 11 and/or the second wall 12 can be arbitrarily set according to the angles α, γ of the first wall 11 and the second wall 12, and the height OD of the reflective member described below (in FIG. 1D M), and the light source device can be miniaturized.

The first wall part 11 and the second wall part 12 can be set in various shapes according to the number and position of the light sources 9 arranged on the substrate 8, for example: three first areas 11R and/or second areas 12R and 12R in a plan view. /or the third regions 13R are adjacent, and the ends of the three tops are concentrated at one point (refer to Figure 3C); as shown in Figure 1A, etc., the four first regions 11R and/or the second regions 12R and/or the third Regions 13R are adjacent, and four tops are concentrated; and six first regions 11R and/or second regions 12R and/or third regions 13R are adjacent, and six tops are concentrated at one point, etc.

The distance between the first wall part 11 and/or the second wall part 12 (P in Figure 1B) can be appropriately adjusted according to the size of the light source used, the size and performance of the target light source device, etc. For example, it can be 1mm~50mm, preferably 5mm~20mm, more preferably 6mm~15mm.

Moreover, it is preferable that the reflective member 10 has the bottom surface 10c in each area. The bottom surface 10c has a through hole arranged substantially in the center within the first region 11R. As shown in FIG. 1A etc., it is preferable that the light source 9 is arrange|positioned in the through hole. The shape and size of the through hole only need to be a shape and size that can expose all the light sources 9 , and it is preferably set so that the outer edge of the through hole is located only in the vicinity of the light source 9 . Thereby, the light from the light source can also be reflected on the bottom surface 10c, thereby improving the light extraction efficiency.

The height of the reflective member 10 itself, that is, the height from the lower surface of the bottom surface 10c of the reflective member 10 to the upper ends of the first wall portion 11 and the second wall portion 12 (OD in FIG. 1D) is 8 mm or less. In the case of a thinner light source device, it is preferably about 1mm~4mm. This allows the backlight unit including optical components such as a diffusion plate described below to be extremely thin.

The thickness of the reflective member 10 may be, for example, 100 μm to 300 μm.

The reflective member 10 is preferably disposed on the substrate 8 , and the lower surface of the bottom surface 10 c of the reflective member 10 is preferably fixed to the upper surface of the substrate 8 . It is particularly preferable to use a light-reflective adhesive member to fix the periphery of the through hole so that the light emitted from the light source 9 does not enter between the substrate 8 and the reflective member 10 . For example, it is more preferable to arrange the light-reflective adhesive member in a ring shape along the outer edge of the through hole. The adhesive member may be a double-sided tape, a hot-melt adhesive sheet, or a resin-based adhesive such as thermosetting resin and thermoplastic resin. The bonding members preferably have high flame retardancy. However, the reflective member 10 may also be fixed to the substrate 8 using screws or the like.

The reflective member 10 is a member having light reflectivity. Thereby, the light emitted from the light source 9 can be efficiently reflected by the first wall part 11 and the second wall part 12 and the bottom surface 10c. In particular, when the first wall portion 11 and the second wall portion 12 are inclined as described above, the light emitted from the light source 9 irradiates the first wall portion 11 and the second wall portion 12, and the light can be reflected upward. . In addition, even when the adjacent first region 11R and/or the second region 12R are not lit, the contrast ratio can be improved, and upward light can be reflected more efficiently.

The reflective member 10 may be molded using a resin containing a reflective material composed of metal oxide particles such as titanium oxide, aluminum oxide, or silicon oxide, or may be molded using a resin containing no reflective material. Finally, a reflective material or reflective film is placed on the surface. It is preferable to set it so that the reflectivity of the light emitted from the light source 9 becomes 70% or more.

The reflective member 10 itself may be a rigid member, a flexible member, or a member that is partially rigid and flexible. Furthermore, it may be a flat member constituting a flat surface, a member constituting a curved surface, or a member having a combination of a flat surface and a curved surface.

The reflective member 10 can be formed by molding using a mold, a molding method using light molding, or the like. As a molding method using a mold, injection molding, extrusion molding, pressure molding, vacuum molding, pressure molding, pressure molding and other molding methods can be applied. For example, by vacuum forming using a reflection sheet made of PET or the like, the reflection member 10 in which the bottom surface 10 c and the first wall portion 11 and the second wall portion 12 are integrally formed can be formed.

(other components)

As shown in FIGS. 1E and 1F , the light source device of this embodiment preferably further includes: a diffusion plate 14 and/or a diffusion sheet 22, a wavelength conversion sheet 23, a wavelength conversion sheet 24, a polarizer 25, and a reflector surrounding the outer periphery of the substrate. An exterior substrate 27 having a wall, a coating substrate 26 having a reflective wall surrounding the outer periphery of the reflective member, and the like. Moreover, these components can be laminated|stacked arbitrarily via adhesive layer and/or reflective layer 28, 29, 31, etc. By arranging such a light source device with a liquid crystal panel or the like, a surface-emitting light source device used as a light source for a direct backlight can be produced. The order in which the optical components are stacked can be set arbitrarily.

(Diffusion plate 14 and/or diffusion sheet 22)

The diffusion plate 14 and/or the diffusion sheet 22 (hereinafter simply referred to as the diffusion plate 14) diffuse the incident light and It is preferable that one member for transmitting light is disposed above the plurality of light sources 9 . The diffusion plate 14 is preferably disposed so as to substantially contact the upper ends of the first wall 11 and the second wall 12 . The diffuser plate 14 is preferably a flat plate-shaped member, but it may also have concavities and convexities on its surface. The diffusion plate 14 is preferably arranged substantially parallel to the substrate 8 . The diffusion plate 14 may be made of a material that has low light absorption for visible light, such as polycarbonate resin, polystyrene resin, acrylic resin, or polyethylene resin. In order to diffuse the incident light, the surface of the diffusion plate 14 may be provided with concavities and convexities, or materials with different refractive indexes may be dispersed in the diffusion plate 14 .

The unevenness can be set to a size of 0.01mm~0.1mm, for example.

As materials having different refractive indexes, for example, polycarbonate resin, acrylic resin, etc. can be selected and used.

The thickness and degree of light diffusion of the diffusion plate 14 can be appropriately set, and commercially available components such as light diffusion sheets and diffusion films can be used. For example, the thickness of the diffusion plate 14 can be set to 1mm~2mm.

When the distance P is between the first wall 11 and/or the second wall 12 of the reflective member 10, it is preferable to arrange the diffusion plate 14 so that the distance OD between the diffusion plate and the light source becomes, for example, 0.3P or less. , it is better to configure it below 0.25P. Here, as shown in FIG. 1B , the height OD refers to the distance from the outermost surface of the substrate 8 , that is, when the covering member 2 , wiring layers 4A, 4B, etc. are provided on the surface of the substrate 8 , to the bottom of the diffusion plate 14 surface distance. From another point of view, the distance between the bottom surface 10c of the reflective member 10 and the upper surface of the diffusion plate 14 is preferably 1.5 mm to 5 mm, and more preferably 2 mm to 3 mm, as shown in FIG. 2A .

The diffusion plate 14 may be provided with a reflective portion on the upper surface and/or the lower surface, above the light source, preferably directly above the light source. In the area above the light source, especially the area directly above, the diffusion plate 14 The distance to the light source 9 becomes the shortest. Therefore, the brightness of this area becomes high. The shorter the distance between the diffusion plate 14 and the light source 9 is, the more obvious the uneven brightness will be in the area directly above the area where the light source 9 is not arranged. Therefore, by providing the reflective portion on the surface of the diffusion plate 14 , a part of the light with high directivity of the light source 9 is reflected and returned toward the light source 9 , thereby alleviating uneven brightness.

The diffusion plate 14 may further have a reflective part on the upper surface and/or the lower surface, above the upper end of the first wall part 11 and/or the second wall part 12, preferably directly above the upper end.

When performing area dimming on the light source 9, the upper end of the first wall 11 and/or the second wall 12 is the boundary area between the unlit area and the lit area. Therefore, by arranging reflection at this location part, can prevent the light from the lit area from leaking to the unlit area, and can make the light towards the unlit area be reflected above the light source 9.

The reflective part may be formed of a material including a light reflective material. For example, resin and/or organic solvent containing a light reflective material may be mentioned. Examples of the light reflecting material include metal oxide particles such as titanium oxide, aluminum oxide, and silicon oxide. The resin and organic solvent can be appropriately selected with reference to the metal oxide particles used, the characteristics required of the manufactured light source device, etc. Among them, as the resin, it is preferable to use a translucent photocurable resin containing an acrylate resin, an epoxy resin, or the like as a main component.

The reflective portion can be formed into various shapes or patterns such as specific stripes or islands. The reflective portion may be formed by any method known in the field, such as printing, inkjet, and spray.

The thickness of the reflective part can be, for example, 10 μm to 100 μm.

(Wavelength conversion plate 23)

The wavelength converter 23 can be disposed on either the upper surface or the lower surface of the diffusion plate 14, but it is relatively Preferably, as shown in FIGS. 1E and 1F , it is arranged on the upper surface of the diffusion plate 14 and/or the diffusion sheet 22 . The wavelength conversion sheet 23 absorbs part of the light emitted from the light source 9 and emits light with a wavelength different from the wavelength of the light emitted from the light source 9 . For example, the wavelength conversion sheet 23 can be set as a light source device that absorbs part of the blue light from the light source 9, emits yellow light, green light and/or red light, and emits white light. Since the wavelength conversion sheet 23 is separated from the light-emitting element of the light source 9, it can be used for phosphors with poor heat or light intensity tolerance that are difficult to use near the light-emitting element. Thereby, the performance of the backlight as a light source device can be improved. The wavelength conversion sheet 23 has a sheet shape or a layer shape, and contains the above-mentioned phosphor and the like.

(稜鏡片24)

The ridge piece 24 has a shape in which a plurality of ridges extending in a specific direction are arranged on its surface. For example, when the plane of the sheet is viewed from the two-dimensional perspective of the x direction and the y direction that is perpendicular to the x direction, the film 24 may have a plurality of films extending in the y direction, and a plurality of films extending in the x direction. The extended 稜鏡 pieces are used in layers. The lens can refract light incident from all directions toward the display panel opposite to the light source device. Thereby, the light emitted from the light-emitting surface of the light source device can be mainly emitted in a direction perpendicular to the upper surface, thereby improving the brightness when the light source device is viewed from the front.

(Polarizer 25)

The polarizer 25 can selectively transmit light in a polarization direction consistent with the polarization direction of a polarizing plate disposed on the backlight side of a display panel, such as a liquid crystal display panel, and direct polarized light in a direction perpendicular to the polarization direction toward the polarizer 25 . 24 side reflections. Part of the polarized light returned from the polarizer 25 is reflected again by the polarizer 24, the wavelength converter 23, and the diffusion plate 14. At this time, the polarization direction changes, for example, it is converted into the polarization direction of the polarizing plate of the liquid crystal display panel, and enters the polarization direction again. It is emitted to the polarizer 25 and emitted to the display panel. Thereby, the polarization directions of the light emitted from the light source device can be made consistent, and the light in the polarization direction effective for improving the brightness of the display panel can be emitted with high efficiency. As the polarizing plate 25, the polarizing plate 24, etc., those commercially available as optical components for backlights can be used.

(Coated substrate 26 and/or exterior substrate 27, adhesive layer and/or reflective layer 28, 29, 31)

The covered substrate 26 has a reflective wall surrounding the outer periphery of the reflective member 10 and is covered by pressing the upper outer edges of the reflective member 10 and optical members such as the diffusion plate 14 to fix or support them.

Furthermore, the exterior substrate 27 has a reflective wall surrounding the outer periphery of the substrate 8 and is a member that covers the back side of the substrate 8 .

These are members that seek to increase the brightness of the light-emitting surface by abutting or engaging the reflective walls with each other to prevent the light emitted from the light-emitting device from leaking to the outside of the reflective walls, that is, to the outside of the light source device.

As long as these members can reflect the light emitted from the light-emitting device, they can be formed of various materials such as resin, metal, and ceramics including reflective materials.

In addition, the adhesive layer and the reflective layer only need to be materials that can bond the upper and lower members and reflect direct light and indirect light emitted from the light-emitting device. For example, various materials such as double-sided tapes, hot-melt adhesive sheets, resin-based adhesives such as thermosetting resins and thermoplastic resins can be used.

[Industrial availability]

The light source device of the present invention can be used in various light source devices, such as light sources for backlights of display devices, lighting devices, and light sources for vehicle-mounted instruments.

9:Light source

10: Reflective component

11: 1st wall

11R: Area 1

12: 2nd wall

12R:Zone 2

13R: Region 3

B,B': section line

J: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

K: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

L: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

N: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

Q: The upper and lower sides are parallel to each other or the left and right sides are parallel to each other.

W: The side that is inclined or curved relative to the upper and lower sides or the left and right sides

Claims (8)

A light source device including: a plurality of light sources; a substrate on which the plurality of light sources are arranged in a matrix; a reflective member including a first wall surrounding each of the light sources, and an outer side outside the first wall. A second wall portion having an opening; the area surrounded by the second wall portion has a second area and a third area, and the second area has an area that is more than half of the area of the first area surrounded by the first wall portion. , the third area has an area less than half of the area of the first area; the light source is arranged in the second area, and the light source is not arranged in the third area. The light source device according to claim 1, wherein the first wall portion of the reflective member is arranged in a quadrangular lattice shape on the substrate. The light source device of claim 1 or 2, wherein the reflective member, in a plan view, consists of the upper and lower sides that are parallel to each other or the left and right sides that are parallel to each other by the first wall portion, and is formed by the second wall portion, the second area or the left and right sides that are parallel to each other. The third region constitutes a side that is inclined or curved with respect to the upper and lower sides or the left and right sides. Such as the light source device of claim 1 or 2, wherein the above-mentioned third area is discontinuous up and down, left and right or diagonally. For example, the light source device of claim 1 or 2 further includes a diffuser plate, a diffuser sheet, and a light source device selected from the group consisting of: At least one of the group consisting of a wavelength converter, a polarizer, and a polarizer that converts light from the above light source into light of different wavelengths. The light source device of Claim 1 or 2 further includes an exterior substrate having a reflective wall surrounding the outer periphery of the substrate. The light source device of claim 1 or 2 further includes a covered substrate having a reflective wall surrounding the outer periphery of the reflective member. The light source device of claim 1 or 2, wherein the above-mentioned light source is a light source with a bat-wing-shaped light distribution.