JP2022112862A - backlight device and display device - Google Patents

Abstract

To provide a backlight device which can inhibit deterioration of uniformity of light emitted from a diffuser panel.SOLUTION: A backlight device radiates light to a display panel. The backlight device includes a diffuser panel 103, a translucent member 105, a light source 109, and a support member 120. The diffuser panel 103 diffuses light. The translucent member 105 is located adjacent to a light incident surface 103a of the diffuser panel 103. The translucent member 105 transmits light. The light source 109 is disposed at the opposite side of the diffuser panel 103 with respect to the translucent member 105. The light source 109 emits light to the diffuser panel 103. The support member 120 is disposed at the opposite side of the diffuser panel 103 with respect to the translucent member 105. The support member 120 supports the translucent member 105.SELECTED DRAWING: Figure 3

Description

The present invention relates to backlight devices and display devices.

BACKGROUND ART Conventionally, a backlight device is known that includes a diffuser plate that diffuses light, a light source that emits light toward the diffuser plate, and a support member that is arranged on the light source side of the diffuser plate and supports the diffuser plate. ing. For example, Patent Literature 1 describes a backlight device that includes a light diffusion plate, a plurality of light sources, and a support member that supports the light diffusion plate. The support member is arranged on the light source side with respect to the light diffusion plate, and supports the light diffusion plate from the light source side.

JP 2013-161793 A

However, in the backlight device described in Patent Literature 1, the support member contacts the surface of the light diffusion plate on the light source side. Therefore, the light from the light source does not enter the portion of the light diffusion plate that is in contact with the support member. Therefore, the amount of light emitted from the front portion of the support member of the light diffusion plate is smaller than the amount of light emitted from other portions of the light diffusion plate. As a result, the uniformity of the light emitted from the light diffusion plate is deteriorated.

The present invention has been made in view of the above problems, and an object thereof is to provide a backlight device and a display device capable of suppressing deterioration in uniformity of light emitted from a diffusion plate.

A backlight device according to one aspect of the present invention irradiates a display section with light. The backlight device includes a diffusion plate, a translucent member, a light source, and a support member. The diffusion plate diffuses light. The translucent member is adjacent to a surface of the diffuser plate opposite to the display section. The translucent member transmits light. The light source is arranged on the side opposite to the diffusion plate with respect to the translucent member. The light source emits light toward the diffusion plate. The support member is arranged on the side opposite to the diffusion plate with respect to the translucent member. The support member supports the translucent member.

ADVANTAGE OF THE INVENTION According to this invention, the backlight apparatus and display apparatus which can suppress that the uniformity of the light emitted from a diffusion plate declines can be provided.

1 is a perspective view showing a display device equipped with a backlight device according to a first embodiment of the invention; FIG. 1 is an exploded perspective view schematically showing the structure of a display device provided with the backlight device of the first embodiment; FIG. FIG. 3 is a cross-sectional view showing the structure around the light source and supporting member of the backlight device of the first embodiment; FIG. 3 is a cross-sectional view showing a translucent member and a diffusion plate according to the first embodiment; FIG. 7 is a cross-sectional view showing a diffusion plate, an adhesive layer, and a translucent member of a backlight device according to a second embodiment; FIG. 11 is a perspective view showing a diffuser plate, a translucent member, and a support member of the backlight device of the third embodiment from the back side;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. In this specification, for ease of understanding, the first direction X, the second direction Y, and the third direction Z that intersect with each other are appropriately described. Also, in this specification, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but they do not have to be orthogonal. The third direction Z indicates the front side of the display device, and the opposite direction of the third direction Z indicates the back side of the display device.

(First embodiment)
A display device 1 including a backlight device 100 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a perspective view showing a display device 1 including a backlight device 100 of this embodiment. As shown in FIG. 1, the display device 1 displays an image. In this specification, an image may be a moving image or a still image. The display device 1 is, for example, an information display.

The display device 1 includes a display panel 11 , a bezel 12 and a backlight device 100 . The display panel 11 displays images. In this embodiment, the display panel 11 is, for example, a liquid crystal panel. The display panel 11 has a substantially rectangular shape. The display panel 11 receives light emitted by the backlight device 100 . The display panel 11 uses light from the backlight device 100 to display an image. The display device 1 also includes a control circuit board 11a (see FIG. 2). The control circuit board 11 a is connected to the display panel 11 . The control circuit board 11 a includes a control section (not shown) that controls driving of the display panel 11 . In addition, the display panel 11 is an example of the "display section" of the present invention.

The bezel 12 integrally holds the display panel 11 and the backlight device 100 . The bezel 12 is made of metal or resin, for example. The bezel 12 is a substantially rectangular frame member. The bezel 12 is attached to the backlight device 100 so as to surround the edge of the display panel 11 .

FIG. 2 is an exploded perspective view schematically showing the structure of the display device 1 including the backlight device 100 of this embodiment. As shown in FIG. 2 , the backlight device 100 irradiates the display panel 11 with light from the rear side of the display panel 11 . The backlight device 100 of this embodiment is a so-called direct type backlight device in which a plurality of light sources 109 are arranged on the back side of the display panel 11 .

Backlight device 100 includes diffusion plate 103 , translucent member 105 , light source 109 , and support member 120 . Also, in this embodiment, the backlight device 100 includes an optical sheet 101 , a reflecting member 107 , a substrate 111 and a chassis 130 .

The optical sheet 101 is arranged on the back side of the display panel 11 . The optical sheet 101 has a substantially rectangular shape. For example, two optical sheets 101 are arranged. The optical sheet 101 is a sheet-like member. The optical sheet 101 includes, for example, at least one of a diffusion sheet, a lens sheet, and a polarizing sheet.

The diffusion plate 103 is arranged on the back side of the optical sheet 101 . That is, the diffusion plate 103 is arranged on the side opposite to the display panel 11 with respect to the optical sheet 101 . The diffusion plate 103 is a substantially rectangular plate member. Also, the diffusion plate 103 diffuses the light. Specifically, the diffusion plate 103 includes a light incident surface 103a and a light exit surface 103b. The light incident surface 103a is arranged facing the light source 109 side, and the light from the light source 109 is incident thereon. The light emitting surface 103 b is arranged facing the display panel 11 side and emits light toward the display panel 11 . The light incident surface 103a is an example of "the surface of the diffuser plate opposite to the display section" in the present invention.

Also, the diffusion plate 103 transmits light from the light source 109 . The diffusion plate 103 diffuses the light and emits the light toward the optical sheet 101 . The diffuser plate 103 is made of translucent resin. Also, the diffusion plate 103 contains diffusion particles that diffuse light. The diffusion particles are contained in the diffusion plate 103 in a dispersed state.

The translucent member 105 is arranged on the rear side of the diffusion plate 103 . That is, the translucent member 105 is arranged on the side opposite to the display panel 11 with respect to the diffusion plate 103 . Specifically, the translucent member 105 is adjacent to the surface of the diffusion plate 103 opposite to the display panel 11 (light incident surface 103a). The translucent member 105 is a substantially rectangular sheet or plate member.

The translucent member 105 transmits light from the light source 109 . The translucent member 105 may be transparent. As used herein, the term “transparent” means that the transmittance of light is, for example, 80% or more. The translucent member 105 is preferably colorless and transparent, but may be colored and transparent.

Further, in this embodiment, the translucent member 105 has substantially the same area as the diffusion plate 103 . Specifically, the length in the first direction X and the length in the second direction Y of the translucent member 105 are substantially the same as the length in the first direction X and the length in the second direction Y of the diffusion plate 103 . . Further, in this embodiment, the translucent member 105 has a thickness smaller than that of the diffuser plate 103 . That is, the length in the third direction Z of the translucent member 105 is shorter than the length in the third direction Z of the diffusion plate 103 . The detailed structures of the diffusion plate 103 and the translucent member 105 will be described later.

The light source 109 emits light. The light source 109 emits light toward the diffusion plate 103 and the translucent member 105 . The light source 109 is arranged on the back side of the translucent member 105 . That is, the light source 109 is arranged on the side opposite to the display panel 11 with respect to the translucent member 105 . Also, the light source 109 is separated from the translucent member 105 . Also, the light source 109 includes, for example, an LED (Light Emitting Diode) element. The light source 109 may include a diffuser lens that diffuses light emitted from the LED elements.

A plurality of light sources 109 are mounted on the substrate 111 . For example, in this embodiment, four light sources 109 are mounted on one substrate 111 . The substrate 111 extends along the bottom plate 130 a of the chassis 130 . The substrate 111 extends along the first direction X, for example. The plurality of light sources 109 are separated from each other in the first direction X on the substrate 111 . In addition, a plurality of substrates 111 are arranged apart from each other in the second direction Y. As shown in FIG. Therefore, the plurality of light sources 109 are arranged, for example, in a matrix.

FIG. 3 is a cross-sectional view showing the structure around the light source 109 and the support member 120 of the backlight device 100 of this embodiment. In FIG. 3, the diffusion plate 103, the translucent member 105, and the light source 109 are not hatched for easy understanding. As shown in FIGS. 2 and 3 , the support member 120 is arranged on the rear side of the translucent member 105 . That is, the support member 120 is arranged on the side opposite to the display panel 11 with respect to the translucent member 105 . A support member 120 supports the translucent member 105 . Further, the support member 120 supports the translucent member 105 from the rear side.

Specifically, the support member 120 includes a base portion 121 and a support portion 122 . Each of the base portion 121 and the support portion 122 is formed in a plate shape having a constant thickness, for example. The base portion 121 is arranged parallel to the bottom plate 130 a of the chassis 130 . The support portion 122 is arranged perpendicular to the base portion 121 . That is, the support portion 122 extends from the base portion 121 toward the translucent member 105 . The support portion 122 includes a tip portion 122a that contacts the translucent member 105 . The support portion 122 has a tapered shape that tapers toward the distal end portion 122a.

A plurality of supporting members 120 are arranged, for example, in the first direction X between adjacent substrates 111 so as to be separated from each other. For example, in the present embodiment, two supporting members 120 are arranged apart from each other in the first direction X between adjacent substrates 111 . In addition, a plurality of supporting members 120 are arranged along the second direction Y, being separated from each other, for example. Therefore, the plurality of support members 120 are arranged, for example, in a matrix. In addition, in the present embodiment, when viewed from the second direction Y, the support member 120 is arranged between the adjacent light sources 109 . Also, the support member 120 is arranged at a position where the distances from the four adjacent light sources 109 are substantially equal.

Moreover, in this embodiment, the support member 120 transmits light. Support member 120 is preferably transparent, but may be translucent. In this specification, translucent means that the transmittance of light is, for example, 50% or more and less than 80%. Further, the support member 120 is preferably colorless and transparent, but may be colored and transparent. The support member 120 is made of resin, for example. The support member 120 is preferably formed using acrylic, for example. Note that the support member 120 may be configured using a material other than resin. Also, the support member 120 does not have to be transparent. For example, support member 120 may be white or have other colors. Also, the support member 120 may not transmit light.

The reflective member 107 is arranged behind the translucent member 105 . That is, the reflecting member 107 is arranged on the side opposite to the display panel 11 with respect to the translucent member 105 . The reflecting member 107 reflects light. Specifically, the reflecting member 107 reflects the light emitted from the light source 109 and reflected by the translucent member 105 or the like. The reflecting member 107 is a substantially rectangular sheet or plate member.

Also, the reflecting member 107 includes a plurality of openings 107a and a plurality of slits 107b. The opening 107a corresponds to the light source 109 and has a circular shape. The light source 109 is inserted from the bottom plate 130a side of the chassis 130 into the opening 107a. The slit 107b corresponds to the support portion 122 of the support member 120 and has a rectangular shape extending in the first direction X. As shown in FIG. The support portion 122 of the support member 120 is inserted into the slit 107b from the bottom plate 130a side. The reflecting member 107 sandwiches the substrate 111 and the base portion 121 of the supporting member 120 with the bottom plate 130 a of the chassis 130 . The reflecting member 107 is fixed in contact with the base portion 121 and the substrate 111 using, for example, a fixing member (not shown) or the like.

The chassis 130 is made of metal or resin, for example. The chassis 130 has a bottom plate 130a and four side walls 130b erected from edges of the bottom plate 130a. Chassis 130 accommodates optical sheet 101 , diffuser plate 103 , translucent member 105 , reflective member 107 , light source 109 , substrate 111 and supporting member 120 . The bezel 12 is attached to the side wall 130b of the chassis 130. As shown in FIG.

As described above with reference to FIGS. 1 to 3, the backlight device 100 of the present embodiment is adjacent to the surface of the diffusion plate 103 opposite to the display panel 11 (light incident surface 103a). A light-transmitting member 105 and a support member 120 that supports the light-transmitting member 105 are provided. Therefore, as shown in FIG. 3, the light from the light source 109 also enters the portion 103c of the diffusion plate 103 that faces the tip portion 122a of the support member 120. As shown in FIG. Therefore, it is possible to prevent the amount of light emitted from the front portion 103d of the support member 120 of the light emission surface 103b of the diffuser plate 103 from becoming smaller than the amount of light emitted from other portions. As a result, deterioration in the uniformity of light emitted from the diffusion plate 103 can be suppressed.

Moreover, in this embodiment, the support member 120 transmits light. Therefore, it is possible to prevent the light emitted from the light source 109 from being blocked by the support member 120 . Therefore, it is possible to suppress the formation of a shadow on the diffusion plate 103 due to the light being blocked by the support member 120 . As a result, deterioration of the uniformity of the light emitted from the diffusion plate 103 can be further suppressed.

Next, the diffuser plate 103 and the translucent member 105 will be described in detail with reference to FIG. FIG. 4 is a cross-sectional view showing the translucent member 105 and diffusion plate 103 of this embodiment. As shown in FIG. 4, it is preferable that there is no air layer between the translucent member 105 and the diffuser plate 103 . In this embodiment, the translucent member 105 is in close contact with the diffusion plate 103 . Therefore, no air layer exists between the translucent member 105 and the diffusion plate 103 . The diffuser plate 103 and the translucent member 105 may be bonded together by, for example, thermocompression bonding. Note that the diffusion plate 103 and the translucent member 105 may be brought into close contact by simply overlapping each other.

It is preferable that the difference between the refractive index of the translucent member 105 and the refractive index of the diffuser plate 103 is small. Further, it is more preferable that the refractive index of the translucent member 105 is substantially the same as the refractive index of the diffuser plate 103 . Specifically, the difference between the refractive index of the translucent member 105 and the refractive index of the diffusion plate 103 is preferably about 0.11 or less. Moreover, the difference between the refractive index of the translucent member 105 and the refractive index of the diffusion plate 103 is more preferably about 0.10 or less, and more preferably about 0.03 or less. Further, it is more preferable that the refractive index of the translucent member 105 and the refractive index of the diffusion plate 103 are the same. In this specification, "substantially the same refractive index" means that the difference in refractive index is about 0.10 or less.

It is preferable that the difference between the coefficient of linear expansion of the translucent member 105 and the coefficient of linear expansion of the diffuser plate 103 is small. More preferably, the coefficient of linear expansion of the translucent member 105 is approximately the same as the coefficient of linear expansion of the diffuser plate 103 . Specifically, the difference between the coefficient of linear expansion of the translucent member 105 and the coefficient of linear expansion of the diffusion plate 103 is preferably about 3.5×10 ⁻⁵ /K or less, and is about 2.4×10 −5 ^/ K or less. ⁵ /K or less is more preferable. Further, it is more preferable that the coefficient of linear expansion of the translucent member 105 and the coefficient of linear expansion of the diffuser plate 103 are the same. In this specification, "substantially the same coefficient of linear expansion" means that the difference between the coefficients of linear expansion is about 3.5×10 ^-5 /K or less.

It is preferable that the visible light transmittance of the translucent member 105 and the visible light transmittance of the diffusion plate 103 are large. The visible light transmittance of the translucent member 105 and the visible light transmittance of the diffusion plate 103 are preferably about 80% or more, more preferably about 86% or more.

Next, materials for the diffuser plate 103 and the translucent member 105 will be specifically described. The diffusion plate 103 and the translucent member 105 are made of resin. Materials for the diffuser plate 103 and the translucent member 105 are not particularly limited, but examples include PS (polystyrene), PC (polycarbonate), PMMA (acrylic), MS (methyl methacrylate/styrene copolymer), PET (polyethylene). terephthalate) and PVC (polyvinyl chloride) can be used. As materials for the diffusion plate 103 and the translucent member 105, for example, COP (cycloolefin polymer), PE (polyethylene), or other resins may be used.

The visible light transmittance, refractive index and linear expansion coefficient of PS, PC, PMMA, MS, PET and PVC are shown in Table 1 below. In Table 1, "a to b" indicates "a or more and b or less".

As shown in Table 1, PS, PC, PMMA, MS, PET and PVC each have good visible light transmittance, refractive index and linear expansion coefficient. However, the visible light transmittance of PVC is lower than that of other resins. Although not shown in Table 1, the heat resistance temperature of PET is lower than that of other resins. Therefore, it is preferable to use PS, PC, PMMA, and MS as materials for the diffusion plate 103 and the translucent member 105 from the viewpoint of visible light transmittance and heat resistance temperature.

Next, the results of calculating the attenuation rate of light due to reflection and the maximum amount of deviation due to expansion and contraction when PS, PC, PMMA, and MS are used as materials for the diffuser plate 103 and the translucent member 105 are shown below. are shown in Table 2. The attenuation rate of light due to reflection is the rate at which light is attenuated by being reflected at the boundary between the diffusion plate 103 and the translucent member 105 . The attenuation rate of light due to reflection was calculated by Fresnel's formula using the refractive indices shown in Table 1. Further, the light attenuation rate due to reflection was calculated by setting the incident angle of light with respect to the diffusion plate 103 to 0° or 45°.

Also, the maximum value of the amount of deviation due to expansion and contraction is the difference in the amount of expansion and contraction due to the temperature of the diffusion plate 103 and the translucent member 105 . In this embodiment, the size of the diffuser plate 103 and the translucent member 105 is set to 80 inches, ie, 1771 mm wide×996 mm long, and the maximum difference in expansion and contraction amounts in the horizontal direction is calculated. Also, the normal temperature was set to 25°C, and the maximum value of the difference in the amount of expansion and contraction at 40°C and 0°C was calculated. In addition, the values shown in Table 1 were used as the coefficient of linear expansion of each material.

As shown in Table 2, when PS, PC, PMMA, and MS are used as materials for the diffusion plate 103 and the light-transmitting member 105, the attenuation rate of light due to reflection and the amount of deviation due to expansion and contraction are good values. turned out to be. Therefore, it is possible to prevent the diffusion plate 103 and the light-transmitting member 105 from being wrinkled, and the diffusion plate 103 and the light-transmitting member 105 from being peeled off. Table 2 shows the case where PS and PC are used as the material of the diffusion plate 103, and PS, PC, PMMA and MS are used as the material of the translucent member 105. PMMA and MS are used as the material of the diffusion plate 103. may be used.

In addition, it was found that the combination of the material of the diffusion plate 103 and the material of the translucent member 105 is preferably a combination of PS or PC and MS from the viewpoint of the attenuation rate of light due to reflection and the amount of deviation due to expansion and contraction. did. Specifically, the combination of PS or PC with MS was found to result in light attenuation rates of about 0.01% and about 0.03% at incident angles of 0° and 45°, respectively. . It was also found that the maximum values of the amount of deviation at temperatures of 40° C. and 0° C. were approximately 0.372 mm and approximately 0.620 mm, respectively.

Further, it was found that it is more preferable that the material of the diffusion plate 103 and the material of the translucent member 105 are the same. Specifically, when the material of the diffusion plate 103 and the material of the translucent member 105 are the same, the attenuation rate of light due to reflection is 0%, and the maximum amount of deviation due to expansion and contraction is 0 mm. There was found.

In Table 2, when PS and PMMA are combined, both the attenuation rate of light due to reflection and the maximum amount of deviation due to expansion and contraction are maximized. This is because PMMA has a wide numerical range of refractive index and linear expansion coefficient. However, it is also possible to suppress the numerical ranges of the refractive index and coefficient of linear expansion of PMMA to the same extent as other resins such as MS.

(Second embodiment)
Next, a backlight device 100 according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, an example in which the adhesive layer 104 is arranged between the diffusion plate 103 and the translucent member 105 will be described. FIG. 5 is a cross-sectional view showing the diffuser plate 103, the adhesive layer 104, and the translucent member 105 of the backlight device 100 of the second embodiment.

As shown in FIG. 5, the backlight device 100 further comprises an adhesive layer 104. As shown in FIG. The adhesive layer 104 is arranged between the diffusion plate 103 and the translucent member 105 . That is, in this embodiment, the adhesive layer 104 is arranged between the translucent member 105 and the diffuser plate 103 . Therefore, no air layer exists between the translucent member 105 and the diffusion plate 103 . Therefore, it is possible to reduce the reflectance when the light emitted from the light source 109 is transmitted through the translucent member 105 and enters the diffusion plate 103 . As a result, reduction in the amount of light emitted from the diffusion plate 103 can be suppressed. Specifically, the translucent member 105 and the diffuser plate 103 are bonded together using the adhesive layer 104 . The translucent member 105 adheres to the diffusion plate 103 via the adhesive layer 104 .

In this embodiment, the light transmitted through the translucent member 105 passes through the boundary between the translucent member 105 and the adhesive layer 104 and the boundary between the adhesive layer 104 and the diffusion plate 103 . Therefore, in order to suppress the reflection of light at each boundary, the difference between the refractive index of the adhesive layer 104 and the refractive index of the translucent member 105, and the difference between the refractive index of the adhesive layer 104 and the refractive index of the diffusion plate 103 is preferably smaller. More preferably, the refractive index of the adhesive layer 104 is substantially the same as at least one of the refractive index of the translucent member 105 and the refractive index of the diffusion plate 103 . Specifically, at least one of the difference between the refractive index of the adhesive layer 104 and the refractive index of the translucent member 105 and the difference between the refractive index of the adhesive layer 104 and the refractive index of the diffusion plate 103 is approximately 0.11. It is preferably no more than about 0.10, more preferably about 0.03 or less. Further, it is more preferable that the refractive index of the adhesive layer 104 is the same as at least one of the refractive index of the translucent member 105 and the refractive index of the diffusion plate 103 . Further, it is more preferable that the refractive index of the adhesive layer 104, the refractive index of the translucent member 105, and the refractive index of the diffusion plate 103 are the same.

In this embodiment, the refractive index of the adhesive layer 104 is substantially the same as at least one of the refractive index of the translucent member 105 and the refractive index of the diffusion plate 103 . Therefore, it is possible to suppress reflection of light on at least one of the boundary between the translucent member 105 and the adhesive layer 104 and the boundary between the adhesive layer 104 and the diffusion plate 103 . As a result, reduction in the amount of light emitted from the diffusion plate 103 can be suppressed.

Also, the adhesive layer 104 is made of elastic resin such as PS, PC, PMMA, MS, PET, and PVC. Therefore, the adhesive layer 104 can absorb stress generated in the translucent member 105 and the diffusion plate 103 due to expansion and contraction. As a result, the occurrence of wrinkles in the translucent member 105 and the diffuser plate 103 and the occurrence of peeling between the translucent member 105 and the diffuser plate 103 can be further suppressed.

Further, in the present embodiment, the adhesive layer 104 contains the same resin as at least one of the translucent member 105 and the diffuser plate 103 . Therefore, the refractive index of the adhesive layer 104 can be substantially the same as at least one of the refractive index of the translucent member 105 and the refractive index of the diffusion plate 103 . Therefore, at least one of the boundary between the translucent member 105 and the adhesive layer 104 and the boundary between the adhesive layer 104 and the diffusion plate 103, the reflection of light can be substantially zero.

Also, the visible light transmittance of the adhesive layer 104 is preferably as high as possible. Visible light transmittance of the adhesive layer 104 is preferably about 80% or more, more preferably about 86% or more.

Other configurations and effects of the second embodiment are the same as those of the first embodiment.

(Third embodiment)
Next, a backlight device 100 according to a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, an example in which the translucent member 105 has an area smaller than that of the diffusion plate 103 will be described. FIG. 6 is a perspective view showing the diffuser plate 103, the translucent member 105, and the support member 120 of the backlight device 100 of the third embodiment from the rear side.

As shown in FIG. 6, the translucent member 105 has a smaller area than the diffuser plate 103 . The translucent member 105 is not arranged over the entire surface of the diffusion plate 103 . Specifically, a plurality of translucent members 105 are arranged. The translucent member 105 is arranged corresponding to the support member 120 . In other words, the translucent member 105 is arranged, for example, only on a portion of the diffusion plate 103 that is supported by the support member 120 . Therefore, the usage amount of the translucent member 105 can be reduced.

Other configurations and effects of the third embodiment are the same as those of the first and second embodiments.

The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and can be implemented in various aspects without departing from the gist of the present invention. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be omitted from all components shown in the embodiments. Furthermore, components across different embodiments may be combined as appropriate. In order to make the drawings easier to understand, the drawings mainly show each component schematically. may be different. In addition, the material, shape, dimensions, etc. of each component shown in the above embodiment are examples and are not particularly limited, and various changes are possible without substantially departing from the effects of the present invention. be.

For example, in the first embodiment, each of the base portion 121 and the support portion 122 of the support member 120 is formed in a plate shape having a constant thickness, but the present invention is not limited to this. The shape of the support member 120 is not particularly limited. For example, the support part 122 of the support member 120 may be formed in a pin shape or a bar shape.

Further, in the first embodiment, an example in which the light sources 109 and the support members 120 are arranged in a matrix, for example, is shown, but the present invention is not limited to this. At least one of the light source 109 and the support member 120 may be arranged in a staggered or irregular manner, for example.

INDUSTRIAL APPLICABILITY The present invention is useful in the fields of backlight devices and display devices.

1 display device 11 display panel (display unit)
100 Backlight device 103 Diffusion plate 103a Light incident surface (surface of the diffusion plate opposite to the display unit)
104 adhesive layer 105 translucent member 109 light source 120 support member

Claims (6)

A backlight device that emits light to a display unit,
a diffusion plate that diffuses light;
a translucent member that is adjacent to a surface of the diffuser plate opposite to the display section and that transmits light;
a light source disposed on the side opposite to the diffuser plate with respect to the translucent member and emitting light toward the diffuser plate;
A backlight device comprising: a support member disposed on a side opposite to the diffusion plate with respect to the light-transmitting member and supporting the light-transmitting member. further comprising an adhesive layer disposed between the diffusion plate and the translucent member;
2. The backlight device according to claim 1, wherein said adhesive layer bonds said translucent member and said diffusion plate. 3. The backlight device according to claim 2, wherein the refractive index of said adhesive layer is substantially the same as at least one of the refractive index of said diffusion plate and the refractive index of said translucent member. 4. The backlight device according to claim 3, wherein the adhesive layer contains the same resin as at least one of the diffusion plate and the translucent member. The backlight device according to any one of claims 1 to 4, wherein the support member transmits light. a backlight device according to any one of claims 1 to 5;
A display device, comprising: a display unit that receives light emitted by the backlight device.

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