JP2021158073A - Planar light source device and display device - Google Patents

Abstract

To provide a planar light source device that improves uniformity of luminance of outgoing light.SOLUTION: A planar light source device comprises a light source substrate, a plurality of light sources, and a section frame. The plurality of light sources is arranged on the light source substrate. The section frame includes a partition wall dividing the plurality of light sources into a plurality of sections. The section frame is arranged on the light source substrate. A cavity is formed inside the partition wall. The partition wall includes an outer wall surface and an inner wall surface. The outer wall surface includes a first inclined surface which receives light emitting from a light source surrounded with the partition wall among the plurality of the light sources and is inclined to the light source substrate. The inner wall surface includes a second inclined surface which forms the cavity and is inclined to the light source substrate. The partition wall is translucent to the light such that a part of the light is reflected by the first inclined surface and the other part is transmitted to the second inclined surface from the first inclined surface.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a planar light source device and a display device.

When the display device includes a display panel that does not emit light by itself, such as a liquid crystal display panel, the display device includes a planar light source device that irradiates the display panel with light. As a technique for illuminating the display panel, a technique called "local dimming" has been put into practical use.

The local dimming type display device partially adjusts the brightness of the light emitted from the planar light source device to the section according to the brightness of the image displayed in each display area divided into a plurality of sections. .. According to the local dimming technique, it is prevented that more light is emitted from the planar light source device, and as a result, the power consumption of the display device is reduced.

In relation to the local dimming technique, the display device disclosed in Patent Document 1 controls the reflection characteristics of the light emitted from the light source by the shape of the tip portion formed by the peripheral wall of the frame provided around the light source. doing. Further, the display device disclosed in Patent Document 2 is provided with a dimming unit having light diffusivity on the upper surface of a partition member surrounding the periphery of the light source. The light emitted from the light source is diffused at the dimming part.

Japanese Unexamined Patent Publication No. 2013-25945 JP-A-2017-207624

When the planar light source device of the display device includes a member that divides a plurality of light sources into a plurality of sections, a bright and dark portion is generated along the position of the member in the brightness distribution of the planar light emitted from the planar light source device. ..

The present disclosure is for solving the above-mentioned problems, and an object of the present invention is to provide a planar light source device in which the uniformity of the brightness of emitted light is improved.

The planar light source device according to the present disclosure includes a light source substrate, a plurality of light sources, and a partition frame. The plurality of light sources are arranged on the light source substrate. The partition frame includes a partition that divides a plurality of light sources into a plurality of partitions. The partition frame is arranged on the light source substrate. A cavity is formed inside the partition wall. The partition wall includes an outer wall surface and an inner wall surface. The outer wall surface includes a first slope to which light emitted from a light source surrounded by a partition wall is incident and is inclined with respect to a light source substrate among a plurality of light sources. The inner wall surface includes a second slope that forms a cavity and is inclined with respect to the light source substrate. The partition wall is semi-transparent to the light so that a part of the light is reflected on the first slope and the other part is transmitted from the first slope to the second slope.

According to the present disclosure, there is provided a planar light source device in which the uniformity of the brightness of the emitted light is improved.

The purposes, features, aspects, and advantages of the present disclosure will be made clear by the following detailed description and accompanying drawings.

It is an exploded perspective view which shows the structure of the display device in Embodiment 1. FIG. It is an exploded perspective view which shows the structure of the planar light source apparatus in Embodiment 1. FIG. It is sectional drawing which shows the structure of the display device and the planar light source device in Embodiment 1. FIG. It is a perspective view which shows the structure of the light source substrate in Embodiment 1. FIG. It is a perspective view which shows the structure of the partition frame in Embodiment 1. FIG. It is sectional drawing which shows the structure of the light source and the partition frame around the light source in Embodiment 1. FIG. It is sectional drawing which shows the structure of the partition wall of the partition frame in Embodiment 1. FIG. It is a figure which shows an example of the grid-like dark part. It is a figure which shows the locus of a light ray when a grid-like dark part is generated. It is sectional drawing which shows the structure of the partition wall in the modification 1 of Embodiment 1. FIG. It is sectional drawing which shows the structure of the partition wall in the modification 2 of Embodiment 1. It is a perspective view which shows the structure of the section frame in the modification 3 of Embodiment 1. FIG. It is sectional drawing in AA shown in FIG. It is sectional drawing in BB shown in FIG. It is sectional drawing which shows the structure of the partition wall of the partition frame in Embodiment 2. FIG. It is a perspective view which shows the structure of the partition frame in Embodiment 2. FIG. It is sectional drawing which shows the structure of the partition wall of the partition frame in Embodiment 3. FIG.

<Embodiment 1>
FIG. 1 is an exploded perspective view showing the configuration of the display device 100 according to the first embodiment. FIG. 2 is an exploded perspective view showing the configuration of the planar light source device 6 according to the first embodiment. FIG. 3 is a cross-sectional view showing the configuration of the display device 100 and the planar light source device 6 according to the first embodiment. The planar shape of the display device 100 in the first embodiment is a rectangle, and the display surface thereof is a planar surface.

The display device 100 includes a protective member 1, a touch panel 3, a display panel 5, and a planar light source device 6.

The protective member 1 protects the touch panel 3 and the display panel 5. The protective member 1 is attached to the touch panel 3 via the first adhesive material 2. The touch panel 3 converts coordinate information corresponding to the position touched by the operator into an electric signal. The touch panel 3 is attached to the display panel 5 via the second adhesive material 4. The protective member 1, the first adhesive material 2, the touch panel 3 and the second adhesive material 4 are transparent members and are arranged on the display surface side of the display panel 5.

The display panel 5 displays an image on the display surface by the planar light emitted from the planar light source device 6. The display panel 5 in the first embodiment is a liquid crystal display panel. The liquid crystal display panel includes a first substrate 51, a second substrate 52, a driving IC (Integrated Circuit) 53, and a circuit board 54. Although the detailed structure of the first substrate 51 is not shown, the first substrate 51 includes a color filter, a black matrix, a counter electrode, and the like provided on the insulating substrate, respectively. The black matrix is a light-shielding layer. Similarly, although the detailed structure of the second substrate 52 is not shown, the second substrate 52 includes pixel electrodes, thin film transistors (TFTs), and the like provided on the insulating substrate, respectively. The TFT has a function of supplying an image signal to the pixel electrodes. The insulating substrate constituting the first substrate 51 and the second substrate 52 is, for example, a glass substrate. The liquid crystal display (not shown) is sandwiched between the first substrate 51 and the second substrate 52. A spacer, a sealing material, an alignment film, and the like (none of the components are shown) are provided between the first substrate 51 and the second substrate 52. The spacer maintains a distance between the first substrate 51 and the second substrate 52. The sealing material seals the liquid crystal display by bonding the first substrate 51 and the second substrate 52 together. The alignment film has a function of orienting the liquid crystal in a predetermined direction. Further, a polarizing plate is provided on the surface of the display panel 5. The drive IC 53 is mounted on the outer peripheral portion of the second substrate 52. The drive IC 53 may be arranged on a tape-shaped wiring board connected to the outer peripheral portion of the second board 52. The tape-shaped wiring board is, for example, TCP (Tape Carrier Package), COF (Chip on Film), or the like. The circuit board 54 is connected to the drive IC 53, and mounts an element that controls the drive IC 53.

The planar light source device 6 is arranged on the back surface of the display panel 5 opposite to the display surface. The planar light source device 6 irradiates the back surface of the display panel 5 with planar light. The planar light source device 6 includes a middle frame 61, an optical sheet 62, a diffuser plate 63, a partition frame 64, a reflection sheet 65, a plurality of light sources 68, a light source substrate 66, and a rear frame 67. The middle frame 61 and the rear frame 67 accommodate an optical sheet 62, a diffuser plate 63, a partition frame 64, a reflective sheet 65, a plurality of light sources 68, a light source substrate 66, and the like, and fix them. Although not shown, an adhesive material for fixing the planar light source device 6 and the protective member 1 or the touch panel 3 is provided on the surface of the middle frame 61. The adhesive material is, for example, a tape, a curable resin, or the like.

FIG. 4 is a perspective view showing the configuration of the light source substrate 66 according to the first embodiment. The plurality of light sources 68 are mounted on the light source substrate 66. The light source 68 is arranged in a matrix on the surface of the light source substrate 66. The light source substrate 66 is provided with wiring for independently driving the light source 68 in units of one or two or more. That is, the light source 68 and the light source substrate 66 are configured so that they can be driven by a local dimming method.

The partition frame 64 is arranged on the light source substrate 66 as shown in FIG. FIG. 5 is a perspective view showing the configuration of the compartment frame 64 according to the first embodiment. The partition frame 64 includes a partition wall 641 that divides the plurality of light sources 68 into a plurality of cells, that is, a plurality of partitions. The partition walls 641 in the first embodiment are provided in a grid pattern so as to surround each of the plurality of light sources 68. In other words, one light source 68 is arranged in one section surrounded by the partition wall 641. However, the configuration of the partition wall 641 is not limited to the above configuration. The partition wall 641 may be configured to surround two or more light sources 68, in which case the two or more light sources 68 are arranged in one compartment. The partition frame 64 reflects a part of the light emitted from the light source 68 surrounded by the partition wall 641 in the direction of the diffuser plate 63. Further, the compartment frame 64 prevents the light emitted from the light source 68 from propagating to the adjacent compartment. The detailed configuration and function of the partition frame 64 in the first embodiment will be described later.

The reflective sheet 65 is provided on the light source substrate 66 as shown in FIG. The reflective sheet 65 has an opening at a position corresponding to the light source 68 arranged on the light source substrate 66. The reflective sheet 65 covers the surface of the light source substrate 66 except for the portion where the light source 68 is arranged. The reflectance of the reflective sheet 65 is higher than the reflectance of the surface of the light source substrate 66. The reflective sheet 65 efficiently reflects the light emitted from the light source 68 that reaches the surface of the light source substrate 66 in the direction of the display panel 5.

The diffuser plate 63 diffuses the light emitted from the light source 68, the light reflected by the partition frame 64, the light reflected by the reflection sheet 65, and the like. As a result, the uniformity of the brightness of the light emitted from the planar light source device 6 is enhanced.

FIG. 6 is a cross-sectional view showing the configuration of the light source 68 and the partition frame 64 around the light source 68 in the first embodiment. FIG. 7 is a cross-sectional view showing the configuration of the partition wall 641 of the partition frame 64 according to the first embodiment. The partition wall 641 includes an outer wall surface forming the outer shape of the partition wall 641 and an inner wall surface forming the cavity 642. The cavity 642 is formed inside the outer wall surface, in other words, is formed inside the partition wall 641. The cavity 642 in the first embodiment is surrounded by an inner wall surface and a surface of the reflective sheet 65. The outer shape of the partition wall 641 is approximately triangular in cross-sectional view. The outer shape of the cavity 642 is a triangle having a size different from the triangle forming the outer shape of the partition wall 641.

The outer wall surface includes the first slope 643. The first slope 643 is inclined with respect to the light source substrate 66. The first slope 643 constitutes a triangle which is the outer shape of the partition wall 641. Further, the first slope 643 is a surface on which the light emitted from the light source 68 surrounded by the partition wall 641 is incident.

The inner wall surface includes a second slope 644. The second slope 644 is inclined with respect to the light source substrate 66. The second slope 644 constitutes a triangle that is the outer shape of the cavity 642. That is, the second slope 644 forms the cavity 642.

In the first embodiment, the first internal angle θA formed by the first slope 643 of the outer wall surface and the light source substrate 66 is smaller than the second internal angle θB formed by the second slope 644 of the inner wall surface and the light source substrate 66. Therefore, the distance between the first slope 643 and the second slope 644, that is, the thickness TX of the partition wall 641, gradually decreases from the lower part to the upper part of the partition wall 641.

The partition wall 641 has semitransparency with respect to the light emitted from the light source 68. Some of the light emitted from the light source 68 is reflected by the first slope 643, and the other part is transmitted from the first slope 643 to the second slope 644. It is preferable that most of the light is reflected on the first slope 643 and the remaining part is transmitted from the first slope 643 to the second slope 644. For example, the transmittance of the partition wall 641 is 10% or less. The partition wall 641 in the first embodiment is made of a white resin. The first slope 643 may be formed of the same white resin as the partition wall 641, or may be formed of a metal thin film having a thickness sufficient to allow light to pass through.

6 and 7 show the trajectories of light emitted from the light source 68. Most of the light emitted from the light source 68 is reflected by the first slope 643 of the partition wall 641 or the reflective sheet 65, and is incident on the diffuser plate 63. A part of the light emitted from the light source 68 is transmitted through the partition wall 641, that is, transmitted from the first slope 643 to the second slope 644. More specifically, the light enters the interior of the partition wall 641 from the first slope 643 and exits from the second slope 644 into the cavity 642. Further, the transmitted light propagates in the cavity 642 and reaches the second slope 644 on the opposite side. Then, the transmitted light propagates upward inside the cavity 642 while repeating reflection on the second slope 644 forming the cavity 642, and heads toward the top 649 of the partition wall 641. Finally, the light is emitted from the top 649 of the partition wall 641 and incident on the diffuser 63. In the process of reflection on the second slope 644, some light passes through the partition wall 641 again and reaches the diffusion plate 63. Since the light is emitted from the top 649 of the partition wall 641, the generation of grid-like dark portions along the partition wall 641 is reduced.

However, if the intensity of the light emitted from the top 649 is too strong, a grid-like bright portion may occur. For example, the intensity of the light emitted from the light source 68 to the lower portion of the partition wall 641 is stronger than the intensity of the light emitted from the upper portion of the partition wall 641. Therefore, when the thickness TX of the lower part of the partition wall 641 and the thickness TX of the upper part are the same, the light transmitted from the lower part of the partition wall 641 to the cavity 642 becomes excessive. Therefore, there is a high possibility that a grid-like bright portion will be generated. In the first embodiment, the thickness TX of the partition wall 641 gradually decreases from the lower part to the upper part of the partition wall 641. The thickness TX at the bottom of the partition wall 641 is thicker than the thickness TX at the top, which prevents excessive light from being emitted from the top 649. Therefore, the generation of grid-like bright and dark portions along the partition wall 641 is reduced.

Summarizing the above, the planar light source device 6 according to the first embodiment includes a light source substrate 66, a plurality of light sources 68, and a partition frame 64. The plurality of light sources 68 are arranged on the light source substrate 66. The partition frame 64 includes a partition wall 641 that divides the plurality of light sources 68 into a plurality of partitions. The partition frame 64 is arranged on the light source substrate 66. A cavity 642 is formed inside the partition wall 641. The partition wall 641 includes an outer wall surface and an inner wall surface. The outer wall surface includes a first slope 643 in which light emitted from a light source surrounded by a partition wall 641 among a plurality of light sources 68 is incident and is inclined with respect to a light source substrate 66. The inner wall surface includes a second slope 644 that forms a cavity 642 and is inclined with respect to the light source substrate 66. The partition wall 641 has semitransparency with respect to the light emitted from the light source surrounded by the partition wall 641. As a result, a part of the light emitted from the light source surrounded by the partition wall 641 is reflected by the first slope 643, and the other part is transmitted from the first slope 643 to the second slope 644.

With such a configuration, the generation of dark portions along the top 649 of the partition wall 641 of the partition frame 64 is reduced. Therefore, the uniformity of the brightness of the light emitted from the planar light source device 6 is improved.

In the local dimming type display device 100, a partition frame 64 is provided in order to prevent the light emitted from the lighting-controlled light source 68 from leaking in the direction of the lighting-controlled light source 68. Unlike the above configuration, for example, when a cavity is not formed inside the partition wall of the partition frame and the partition wall does not have semitransparency, a grid-like dark portion is generated in the image of the display panel. FIG. 8 is a diagram showing an example of a grid-like dark portion 97 appearing in the display area 98 of the display device 99. No cavity is formed inside the partition wall of the partition frame included in the display device 99, and the partition wall is not semi-transparent. Therefore, a grid-like dark portion 97 is generated in the display area 98, and the dark portion 97 is visually recognized by the user. FIG. 9 is a diagram showing a trajectory of light rays when the grid-like dark portion 97 is generated. Since the partition wall 94 does not have semitransparency, the light emitted from the light source 68 does not pass through the partition wall 94. The light is reflected by the slope 941 of the partition wall 94 or the reflective sheet 65 and is incident on the diffuser plate 63. Note that in FIG. 8, the locus of light reflected by the reflective sheet 65 is not shown. In the process in which the light emitted from the light source 68 reaches the diffuser plate 63, it is difficult for the light to wrap around between the top 95 of the partition wall 94 and the diffuser plate 63. Therefore, the brightness of the area surrounded by the adjacent partition walls 94, that is, the area above the light source 68 is lower than the brightness of the area along the top 95 of the partition wall 94. Therefore, a grid-like dark portion 97 is generated in the display area 98.

On the other hand, as described above, in the planar light source device 6 according to the first embodiment, light is emitted from the top 649 of the partition wall 641. The planar light source device 6 reduces the generation of grid-like dark portions 97 along the partition wall 641 of the partition frame 64. The brightness uniformity of the emitted light of the planar light source device 6 is improved, and the display quality of the display device 100 is improved.

Further, the first internal angle θA formed by the first slope 643 of the outer wall surface and the light source substrate 66 in the first embodiment is smaller than the second internal angle θB formed by the second slope 644 of the inner wall surface and the light source substrate 66. With this configuration, the thickness TX of the partition wall 641 gradually decreases from the lower part to the upper part of the partition wall 641. Such a configuration prevents excessive light from being emitted from the top 649. As a result, the generation of grid-like bright and dark portions along the partition wall 641 is reduced. In other words, the generation of grid-like bright and dark portions can be adjusted by changing the relationship between the first internal angle θA and the second internal angle θB of the partition wall 641.

(Modification 1 of Embodiment 1)
FIG. 10 is a cross-sectional view showing the configuration of the partition wall 641A in the first modification of the first embodiment. Further, FIG. 10 shows a light ray incident on the partition wall 641A.

The first internal angle θA in the first modification of the first embodiment is determined by the reflection efficiency or the brightness uniformity calculated by simulation or the like. For example, the first internal angle θA is set to an angle at which the light emitted from the light source 68 is efficiently reflected on the first slope 643 in the direction of the display panel 5, or an angle at which the brightness uniformity of the planar light is improved. NS.

As described above, since the first internal angle θA is determined by the function related to the reflection of the first slope 643, the degree of change in the thickness TX of the partition wall 641A depends on the size of the second internal angle θB. The second internal angle θB in the second embodiment is larger than the first internal angle θA as in the first embodiment. The second internal angle θB is preferably 10% or more larger than the first internal angle θA. Due to the relationship between the first internal angle θA and the second internal angle θB, the thickness TX of the partition wall 641A gradually decreases from the lower part to the upper part of the partition wall 641A.

Further, the thickness TY of the partition wall 641A at the top 649 of the partition wall 641A is thinner than the thickness TX of the partition wall 641A at the portion other than the top 649. The portion other than the top portion 649 is a portion where the first slope 643 and the second slope 644 are formed.

The light incident on the inside of the partition wall 641A from the lower part is less likely to reach the cavity 642 than the light incident on the inside of the partition wall 641A from the upper part. This is because the light is diffused or absorbed while traveling inside the partition wall 641A. On the other hand, the light incident on the inside of the partition wall 641A from the upper portion having a thin thickness TX easily reaches the cavity 642. Here, as an example, the light incident on the inside of the partition wall 641A from the region of the lower 2/3 with respect to the height of the partition wall 641A does not reach the cavity 642. That is, the lower two-thirds of the region is the opaque region 646. On the other hand, the light incident on the inside of the partition wall 641A from the upper 1/3 region reaches the cavity 642. That is, the upper 1/3 region is the transmission region 645. The light that reaches the cavity 642 propagates to the top 649 of the partition wall 641A as in the first embodiment. The thickness TY of the partition wall 641A at the top 649 is thinner than the thickness TX of the portion where the first slope 643 and the second slope 644 are formed. Therefore, the light is efficiently emitted from the top 649 of the partition wall 641A.

As described above, in the first modification of the first embodiment, the thickness TX of the partition wall 641A is adjusted by the relationship between the first internal angle θA and the second internal angle θB. The first internal angle θA is determined by the reflection efficiency. The second internal angle θB is preferably larger than the first internal angle θA by 10% or more. Thereby, the intensity of the light emitted from the top 649 of the partition wall 641A is adjusted.

Further, in the first modification of the first embodiment, the thickness TY of the partition wall 641A at the top 649 is thinner than the thickness TX of the partition wall 641A at the portion other than the top 649. With such a configuration, light is efficiently emitted from the top 649 of the partition wall 641A. As a result, the generation of the grid-like dark portion 97 along the partition wall 641A is reduced.

Further, by adjusting the thickness TY of the top 649 and the thickness TX of the partition wall 641A of the portion other than the top 649, the intensity of the light emitted from the top 649 can be adjusted. For example, when the intensity of the light emitted from the top 649 is excessive, the grid-like bright part is improved by increasing the thickness TY. On the contrary, when the intensity of the light emitted from the top 649 is insufficient, the grid-like dark portion 97 is improved by reducing the thickness TY.

Such a planar light source device 6 reduces the generation of grid-like bright and dark portions and improves the brightness uniformity of the emitted light. Therefore, the display quality of the display device 100 is improved.

(Modification 2 of Embodiment 1)
FIG. 11 is a cross-sectional view showing the configuration of the partition wall 641B in the second modification of the first embodiment. The first internal angle θA is the same as the second internal angle θB. Further, the thickness TY of the partition wall 641B on the top 649 is thicker than the thickness TX of the partition wall 641B at the portion other than the top 649. The portion other than the top portion 649 is a portion where the first slope 643 and the second slope 644 are formed.

Since the first internal angle θA is the same as the second internal angle θB, the thickness TX of the partition wall 641B at the portion where the first slope 643 and the second slope 644 are formed becomes uniform. In the second modification of the first embodiment, the intensity of the light emitted from the top 649 is adjusted by the thickness TY of the top 649. For example, if the thickness TX of the partition wall 641B is uniform, the intensity of light transmitted from the first slope 643 to the second slope 644 may increase. In that case, a top 649 thicker than the thickness TX is provided. As a result, the intensity of the light emitted from the top 649 does not become excessively strong. Even in such a configuration, the generation of grid-like bright and dark areas is reduced, and the brightness uniformity of the emitted light is improved. Therefore, the display quality of the display device 100 is improved.

(Modification 3 of Embodiment 1)
The planar shape of the display surface of the display device 100 and the light emitting surface of the planar light source device 6 is not limited to a rectangle, and may have a shape different from the rectangle, for example, a polygon. Further, the display surface of the display device 100 and the light emitting surface of the planar light source device 6 are not limited to a flat surface, and may have a curved surface. The planar shape of the display surface of the display device and the light emission surface of the planar light source device in the third modification of the first embodiment has a horizontally long hexagon in which two adjacent corners of a rectangle are cut off. Further, the display surface of the display device and the light emission surface of the planar light source device are curved with a constant curvature. That is, the display surface and the light emitting surface have a curved surface.

FIG. 12 is a perspective view showing the configuration of the compartment frame 64A in the third modification of the first embodiment. FIG. 13 is a cross-sectional view taken along the line AA shown in FIG. FIG. 14 is a cross-sectional view taken along the line BB shown in FIG. Similar to the light emitting surface of the planar light source device, the partition frame 64 also has a horizontally long hexagonal planar shape and is curved with a constant curvature. The configuration of other parts is the same as that of the first embodiment.

Also in such a display device, the intensity of the light emitted from the top 649 of the partition wall 641 is controlled, and the grid-like bright and dark areas in the display area are reduced.

Further, the display device according to the third modification of the first embodiment can be applied to an application in which various outer shapes and various curved display surfaces are required. For example, an in-vehicle display device has a polygonal display surface and a curved display surface in order to enhance the design of the interior space of the vehicle. The display device according to the third modification of the first embodiment is also applicable to such an in-vehicle application. The display surface of the display device and the light emitting surface of the planar light source device are not limited to curved surfaces having a constant curvature. The display surface and the light emitting surface may be, for example, an S-shaped curved surface, a surface in which curved surfaces having a plurality of curvatures are combined, or a curved surface of a free curve. .. In that case, the compartment frame 64 is curved as well as those curved surfaces.

<Embodiment 2>
The planar light source device and the display device according to the second embodiment will be described. The second embodiment is a subordinate concept of the first embodiment, and the planar light source device according to the second embodiment includes each configuration of the planar light source device 6 according to the first embodiment. The same configuration and operation as in the first embodiment will not be described.

FIG. 15 is a cross-sectional view showing the configuration of the partition wall 641C of the partition frame 64 according to the second embodiment. FIG. 16 is a perspective view showing the configuration of the compartment frame 64 according to the second embodiment. The partition wall 641C includes a through hole 647 penetrating the first slope 643 and the second slope 644. When the partition frame 64 is processed by injection molding or the like, the mold for molding the partition frame 64 is provided with a protrusion for forming a through hole 647. Then, a through hole 647 is formed together with the molding of the partition frame 64. Alternatively, the through hole 647 is formed in the partition frame 64 by a processing machine by numerical control such as CNC (computerized numerical control).

Most of the light emitted from the light source 68 is reflected by the first slope 643 of the partition wall 641C or the reflection sheet 65, and is incident on the diffuser plate 63. A part of the light emitted from the light source 68 is transmitted through the partition wall 641C, that is, transmitted from the first slope 643 to the second slope 644. Further, the other part of the light emitted from the light source 68 propagates from the through hole 647 into the cavity 642. The light that has passed through the partition wall 641C and reached the cavity 642 and the light that has reached the cavity 642 through the through hole 647 propagate upward inside the cavity 642 while being repeatedly reflected on the second slope 644. Finally, the light is emitted from the top 649 of the partition wall 641C and incident on the diffuser 63.

The through hole 647 increases the amount of light emitted from the top 649 of the partition wall 641C. For example, even in the configuration of the first embodiment and its modified example, the above-mentioned through hole 647 is effective when the amount of light emitted from the top 649 of the partition wall 641C is insufficient. The through hole 647 reduces the grid-like dark portion 97 along the partition wall 641C of the partition frame 64, and improves the brightness uniformity of the emitted light of the planar light source device. The number and size of through holes 647 are not limited to the configuration shown in FIG. 15 or FIG. The number and size of the through holes 647 are adjusted according to the degree of the grid-like dark portion 97.

(Modified Example of Embodiment 2)
The partition wall 641C in the modified example of the second embodiment includes a recessed portion (not shown) in the first slope 643 of the partition wall 641C instead of the above-mentioned through hole 647. In the recessed portion, the thickness of the partition wall 641C is thinner than the peripheral thickness. Therefore, the light is transmitted from the recessed portion to the cavity 642, and the amount of light emitted from the top portion 649 of the partition wall 641C is increased. As a result, the grid-like dark portion 97 along the partition wall 641C of the partition frame 64 is reduced, and the brightness uniformity of the emitted light of the planar light source device is improved.

<Embodiment 3>
The planar light source device and the display device according to the third embodiment will be described. The third embodiment is a subordinate concept of the first embodiment, and the planar light source device according to the third embodiment includes each configuration of the planar light source device 6 according to the first embodiment. The description of the configuration and operation similar to those of the first or second embodiment will be omitted.

FIG. 17 is a cross-sectional view showing the configuration of the partition wall 641D of the partition frame 64 according to the third embodiment. The partition wall 641D includes a colored layer 648 on the second slope 644. The colored layer 648 in the third embodiment includes a blue coloring material.

The colored layer 648 contains, for example, a paint. The colored layer 648 is formed by applying a paint to the second slope 644. Or, for example, the colored layer 648 is formed by a colored film. The film is attached to the second slope 644 with a highly transparent adhesive. Alternatively, for example, the colored layer 648 is integrally formed with the partition wall 641D. The colored layer 648 is formed by insert molding a colored film and a white resin when the partition frame 64 is processed by injection molding or the like.

When the partition wall 641D is made of a white resin and the light emitted from the light source 68 is white light, the chromaticity of the light transmitted through the partition wall 641D may be yellowish. The blue colored layer 648 returns the transmitted light whose chromaticity is shifted to yellow to white light. The colored layer 648 in the third embodiment is blue, but is not limited thereto. The color of the colored layer 648 for returning to white light is determined by the color absorbed by the partition wall 641D. In other words, the color of the light emitted from the top 649 can be adjusted by the tinted layer 648.

In the present disclosure, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted.

Although the present disclosure has been described in detail, the above description is exemplary and not limited in all respects. A myriad of variants not illustrated can be envisioned.

1 Protective member, 2 1st adhesive material, 3 touch panel, 4 2nd adhesive material, 5 display panel, 6-sided light source device, 51 1st substrate, 52 2nd substrate, 53 drive IC, 54 circuit board, 61 middle Frame, 62 Optical sheet, 63 diffuser, 64 compartment frame, 64A compartment frame, 65 reflection sheet, 66 light source board, 67 rear frame, 68 light source, 94 partition, 97 dark part, 98 display area, 99 display device, 100 display device , 641 bulkhead, 641A bulkhead, 641B bulkhead, 641C bulkhead, 641D bulkhead, 642 cavity, 643 first slope, 644 second slope, 645 permeation region, 646 impermeable region, 647 through hole, 648 colored layer, 649 top, TX Thickness, TY thickness, θA first interior angle, θB second interior angle.

Claims (11)

Light source board and
A plurality of light sources arranged on the light source substrate,
A partition frame including a partition wall for dividing the plurality of light sources into a plurality of partitions and arranged on the light source substrate is provided.
A cavity is formed inside the partition wall.
The partition wall
An outer wall surface including a first slope to which light emitted from a light source surrounded by the partition wall is incident and inclined with respect to the light source substrate among the plurality of light sources.
An inner wall surface including a second slope that forms the cavity and is inclined with respect to the light source substrate, and includes
A planar shape having semitransparency with respect to the light so that a part of the light is reflected on the first slope and the other part is transmitted from the first slope to the second slope. Light source device. The planar shape according to claim 1, wherein the first internal angle formed by the first slope of the outer wall surface and the light source substrate is smaller than the second internal angle formed by the second slope of the inner wall surface and the light source substrate. Light source device. A claim that the thickness of the partition wall from the outer wall surface to the inner wall surface at the top of the partition wall is thinner than the thickness of the partition wall from the first slope to the second slope in a portion other than the top of the partition wall. 1 or the planar light source device according to claim 2. The planar light source according to any one of claims 1 to 3, wherein the partition wall includes a through hole penetrating the first slope and the second slope, or a recessed portion in the first slope. Device. The planar light source device according to any one of claims 1 to 4, wherein the partition wall includes a colored layer on the second slope. The planar light source device according to claim 5, wherein the colored layer contains a paint. The planar light source device according to claim 5, wherein the colored layer includes a colored film. The planar light source device according to claim 5, wherein the colored layer is integrally formed with the partition wall. The planar light source device according to any one of claims 5 to 8, wherein the colored layer contains a blue coloring material. The planar light source device according to any one of claims 1 to 9, wherein the plurality of light sources are independently driven for each of the plurality of compartments. The planar light source device according to any one of claims 1 to 10.
A display panel for displaying an image by the planar emitted light emitted by the planar light source device is provided.
A display device in which the light emitting surface of the planar light source device and the display surface of the display panel have an outer shape that is curved or different from a rectangle.

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