WO2012081487A1

WO2012081487A1 - Lighting device and display device

Info

Publication number: WO2012081487A1
Application number: PCT/JP2011/078405
Authority: WO
Inventors: 真之助野澤
Original assignee: シャープ株式会社
Priority date: 2010-12-15
Filing date: 2011-12-08
Publication date: 2012-06-21

Abstract

Provided is a lighting device with which unevenness in the luminance of the member being illuminated can be suppressed. This backlight device (lighting device) (3) is equipped with: LED packages (4) which function as a light source; lens members (6) which increase the spread angle of the light emitted from the LED packages; a diffuser panel (8) to which the light emitted from the lens members is incident; and a reflecting layer (11), which is provided on the surface of the diffuser panel and has the function of blocking at least a portion of the light. The reflecting layer is provided on at least the portion of the surface of the diffuser panel which opposes the LED packages.

Description

Illumination device and display device

The present invention relates to a lighting device and a display device, and more particularly to a lighting device and a display device including a light emitting element and a package that functions as a light source.

Conventionally, an illumination device including a package that functions as a light source is known.

FIG. 11 is a cross-sectional view showing the structure of a conventional lighting device including a package that functions as a light source. As shown in FIG. 11, an illumination device 1001 according to a conventional example includes a plurality of LED (Light Emitting Diode) packages 1002 functioning as a light source, a mounting substrate 1003 to which a plurality of LED packages 1002 are attached, and an LED package 1002. And a diffusion plate 1004 on which the emitted light is incident.

In the illumination device 1001, a lens portion 1004a including a large number of convex portions is formed on the surface of the diffusion plate 1004. And the light radiate | emitted from the LED package 1002 advances to the display panel (illuminated member) side which is not illustrated in the state diffused by the lens part 1004a. For this reason, it is possible to suppress the occurrence of uneven brightness on the display panel (not shown) to some extent.

Note that the illumination device as described above is disclosed in Patent Document 1, for example.

JP 2007-329016 A

However, in the lighting device 1001 shown in FIG. 11, when the thickness of the lighting device 1001 is reduced or the interval between the plurality of LED packages 1002 is increased, it is difficult to sufficiently diffuse the light emitted from the LED package 1002. is there. For this reason, it is difficult to sufficiently suppress the luminance unevenness of the illumination light, and there is a problem that the luminance unevenness occurs in the display panel (illuminated member).

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illuminating device and a display device capable of suppressing occurrence of luminance unevenness in an illuminated member. It is to be.

In order to achieve the above object, an illumination device according to a first aspect of the present invention includes a light emitting element, a package that functions as a light source, and a spread angle of light emitted from the package, disposed on the light emitting side of the package. A lens member that enlarges the light, a diffusion plate or a light guide plate on which light emitted from the lens member is incident, and a light shielding layer provided on the surface of the diffusion plate or the light guide plate and having a function of shielding at least a part of the light The light shielding layer is provided on at least the surface of the diffusion plate or the light guide plate facing the package.

In the present specification, “light shielding” is a concept including reflecting light and absorbing light. The “light-shielding layer” is a concept including a layer that transmits part of light, as will be described later.

In the illumination device according to the first aspect, as described above, the lens member that increases the spread angle of the light emitted from the package is arranged on the light emission side of the package, so that the light emitted from the package is spread. It is possible to reach the diffusing plate or the light guide plate in a state in which is increased (diffused state). Thereby, it can suppress that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member.

Also, in the lighting device according to the first aspect, as described above, the light shielding layer is provided on the surface of at least the portion of the diffusion plate or the light guide plate that faces the package. Thereby, at least a part of the light traveling toward the portion of the diffusion plate or the light guide plate facing the package can be shielded. For this reason, the diffusion of light by the lens member is not sufficient, and the amount of light traveling toward the portion of the diffusion plate or light guide plate facing the package is larger than the light traveling toward the other portion ( Even if it is a strong case, it can suppress that the light radiate | emitted from the part which opposes a package among a diffusion plate or a light-guide plate increases (strong) compared with the light radiate | emitted from another part. . Thereby, it can suppress more that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member.

As a result, in the lighting device according to the first aspect, even when the thickness of the lighting device is reduced or the interval between the packages (light sources) is increased, the occurrence of uneven brightness in the illuminated member is suppressed. Can do.

In addition, in this specification, that there is much light (strong) means that luminous intensity is high.

In the illumination device according to the first aspect, preferably, the light shielding layer has a function of reflecting at least a part of the light. If comprised in this way, the light reflected by the light shielding layer can be incident on a lens member again, and a divergence angle can be enlarged again (diffused). Thereby, since light can be made to reach | attain a diffuser plate or a light-guide plate in the state which diffused more, it can suppress more that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member. In addition, the light use efficiency can be improved as compared with the case where the light shielding layer has a function of absorbing light.

The illumination device according to the first aspect preferably includes a diffuser plate on which light emitted from the lens member is incident. In this way, by providing the diffusing plate in the lighting device, the light emitted from the package can be further diffused by the diffusing plate, so that it is possible to further suppress the occurrence of luminance unevenness in the illuminated member. .

In addition, the direct illumination device is more likely to cause uneven brightness in the illuminated member than the edge light illumination device. For this reason, it is particularly effective to apply the present invention when using a direct illumination device in which a diffusion plate is usually provided.

In the illumination device including the diffusion plate, the diffusion plate includes a first light incident surface on which light emitted from the package is incident, and a first light emission surface disposed on the opposite side of the first light incident surface, The light shielding layer may be provided on at least one of the first light incident surface and the first light emitting surface.

The illumination device according to the first aspect preferably includes a light guide plate on which light emitted from the lens member is incident. In the edge light type illuminating device, a portion near the package of the illumination target member is likely to be brighter than other portions. However, in the lighting device according to the first aspect, when an edge light type lighting device in which a light guide plate is usually provided is used, a portion near the package among the members to be illuminated is brighter than other portions. Can be suppressed.

In the lighting device including the light guide plate, the light guide plate includes a second light incident surface on which light emitted from the package is incident, and a second light output surface extending in a direction intersecting the second light incident surface. The light shielding layer may be provided on at least one of the second light incident surface and the second light emitting surface.

In the lighting device according to the first aspect, preferably, the light shielding layer is provided uniformly on the surface. If comprised in this way, a light shielding layer can be easily formed in the surface of a diffusion plate or a light-guide plate.

In the illuminating device in which the light shielding layer is provided uniformly, the light shielding layer is preferably formed in a solid shape and has a function of transmitting part of light. Thus, the light shielding layer can be easily and uniformly formed by forming the light shielding layer in a solid shape. Moreover, even if the light shielding layer is formed in a solid shape by forming the light shielding layer so as to have a function of transmitting part of the light, the light emitted from the lens member is transmitted through the light shielding layer. And can be used as illumination light.

In the lighting device in which the light shielding layer is provided uniformly, preferably, the light shielding layer is uniformly dispersed. If comprised in this way, the light radiate | emitted from the lens member can be passed through the part in which the light shielding layer is not formed, and can be utilized as illumination light. In this case, the light shielding layer may or may not have a function of transmitting part of the light.

In the lighting device according to the first aspect, preferably, the light shielding layer is provided unevenly on the surface, and the first portion of the light shielding layer that faces the package is the first portion of the light shielding layer. The light is shielded more than the second part other than. If comprised in this way, it can suppress more that the light radiate | emitted from the part which opposes a package among a diffusion plate or a light-guide plate increases (strong) compared with the light radiate | emitted from another part. . Thereby, it can suppress more that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member.

The lighting device according to the first aspect preferably further includes a light-shielding film including a light-shielding layer and a support layer formed in close contact with the light-shielding layer. If comprised in this way, the light shielding layer by which the light shielding layer was formed on the surface of a support layer closely_contact | adhere to the surface of a diffusion plate or a light-guide plate, and a light shielding layer can be easily made into a diffusion plate or It can be provided on the surface of the light guide plate.

In the lighting device including the light shielding film, the light shielding film is preferably formed using the same material as the diffusion plate or the light guide plate. If comprised in this way, since it can suppress that the difference of the thermal expansion coefficient of a light shielding film and a diffusion plate or a light-guide plate becomes large, when a light-shielding film and a diffusion plate or a light-guide plate become high temperature Further, it is possible to suppress the occurrence of warpage between the light shielding film and the diffusion plate or the light guide plate.

The lighting device according to the first aspect preferably further includes a mounting substrate to which a package is attached, and the lens member is attached to the mounting substrate. If comprised in this way, after attaching a lens member to a mounting substrate, it is not necessary to align a package and a lens member, Therefore It can suppress that the assembly process of an illuminating device becomes complicated. In addition, it is possible to suppress the occurrence of displacement between the package and the lens member.

The illumination device including the diffusion plate preferably further includes an optical sheet having at least one of a function of condensing the light transmitted through the diffusion plate and a function of diffusing the light transmitted through the diffusion plate. If comprised in this way, when the optical sheet has a function which condenses the light which permeate | transmitted the diffuser plate, the brightness | luminance of the front direction of a to-be-illuminated member can be improved. Moreover, when the optical sheet has a function of diffusing the light transmitted through the diffusion plate, it is possible to further suppress the occurrence of luminance unevenness in the illuminated member.

The illumination device including the light guide plate preferably further includes an optical sheet having at least one of a function of condensing light transmitted through the light guide plate and a function of diffusing light transmitted through the light guide plate. If comprised in this way, when the optical sheet has a function which condenses the light which permeate | transmitted the light-guide plate, the brightness | luminance of the front direction of a to-be-illuminated member can be improved. In addition, when the optical sheet has a function of diffusing light transmitted through the light guide plate, it is possible to further suppress the occurrence of luminance unevenness in the illuminated member.

A display device according to a second aspect of the present invention includes the illumination device configured as described above and a display panel illuminated by the illumination device. If comprised in this way, the display apparatus which can suppress that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member can be obtained.

As described above, according to the present invention, it is possible to easily obtain an illuminating device and a display device capable of suppressing occurrence of luminance unevenness in a member to be illuminated.

1 is a cross-sectional view illustrating a structure of a liquid crystal display device according to a first embodiment of the present invention. It is the top view which showed the lens member and reflection member of FIG. It is the disassembled perspective view which showed the structure of the diffusion plate and light shielding film of FIG. It is the expanded sectional view which showed the structure of the backlight apparatus of FIG. It is the expanded sectional view which showed the structure of the backlight apparatus of FIG. FIG. 6 is a cross-sectional view illustrating a structure of a backlight device of a liquid crystal display device according to a second embodiment of the present invention. It is the figure which showed the quantity (intensity) of the light which permeate | transmits the diffuser plate in which the reflection layer is not provided. It is the top view which showed the structure of the light shielding film (reflection layer) of FIG. It is sectional drawing which showed the structure of the liquid crystal display device by 3rd Embodiment of this invention. FIG. 10 is a plan view showing the structure of the backlight device of FIG. 9. It is sectional drawing which showed the structure of the illuminating device by a conventional example provided with the LED package which functions as a light source.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In order to facilitate understanding, even a cross-sectional view may not be hatched.

(First embodiment)
First, the structure of the liquid crystal display device 1 according to the first embodiment of the invention will be described with reference to FIGS.

The liquid crystal display device 1 according to the first embodiment of the present invention constitutes, for example, a liquid crystal television receiver (not shown). As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal display panel 2 and a backlight device 3 that is disposed on the lower side (back side) of the liquid crystal display panel 2 and illuminates the liquid crystal display panel 2. Has been. The liquid crystal display device 1 is an example of the “display device” in the present invention, and the liquid crystal display panel 2 is an example of the “display panel” in the present invention. The backlight device 3 is an example of the “illumination device” in the present invention.

The liquid crystal display panel 2 includes two glass substrates that sandwich a liquid crystal layer (not shown). The liquid crystal display panel 2 functions as a display panel when illuminated by the backlight device 3.

Here, in the first embodiment, the backlight device 3 is a direct-type backlight device, and includes a plurality of LED packages 4 functioning as point light sources, a mounting substrate 5 to which the LED packages 4 are attached, and the LED package 4. A plurality of lens members 6 arranged so as to cover the upper side, a reflecting member 7 arranged on the mounting substrate 5, a diffusion plate 8 arranged between the lens member 6 and the liquid crystal display panel 2, and an LED package 4 and a backlight chassis 9 that houses the reflecting member 7 and the like. The LED package 4 is an example of the “package” in the present invention.

The plurality of LED packages 4 are arranged in the longitudinal direction (A direction) and the lateral direction (B direction) of the liquid crystal display panel 2 (see FIG. 1), as shown in FIG. Further, the LED package 4 includes a light emitting element 4a as shown in FIG. The LED package 4 may be configured to include, for example, three types of light emitting elements 4a that respectively emit red light, green light, and blue light, or one type of light emitting element 4a that emits blue light. And a phosphor (not shown) that changes part of the blue light into yellow light.

The LED package 4 is attached to the mounting substrate 5 using a solder layer (not shown) or the like.

Further, the light emitted from the LED package 4 is emitted at a predetermined spread angle.

The lens member 6 is disposed on the light emitting side (the diffusion plate 8 side) of the LED package 4. The lens member 6 is formed of a material (for example, resin or glass) that transmits light emitted from the LED package 4. The lens member 6 has a function of increasing the spread angle of the light emitted from the LED package 4.

The lens member 6 includes a lens portion 6a and a plurality of (for example, three) leg portions 6b. The lens portion 6a includes a light emitting surface (upper surface) 6c and a lower surface 6d formed on the side opposite to the light emitting surface 6c.

The light exit surface 6c is formed in a substantially convex shape so that the spread angle of the light emitted from the lens member 6 is increased.

Further, the central portion of the light emitting surface 6c (the surface of the portion facing the LED package 4) is formed in a concave shape. In addition, the center part of the light-projection surface 6c does not need to be formed in concave shape.

A recess 6e is formed at the center of the lower surface 6d (the surface of the portion facing the LED package 4). Thereby, as will be described later, the traveling direction of the light emitted obliquely upward (obliquely forward) from the LED package 4 is further changed to the outside, and the light spreading angle is increased. In addition, the recessed part 6e does not need to be formed in the center part of the lower surface 6d.

The leg portion 6b is attached to a predetermined position of the mounting substrate 5 using, for example, an adhesive (not shown).

The mounting substrate 5 is formed in, for example, an elongated shape extending in the A direction, and a plurality of the mounting substrates 5 are arranged in the B direction (see FIG. 2). Note that the mounting substrate 5 may be formed so as to extend in the A direction and the B direction, and all the LED packages 4 may be attached to one mounting substrate 5.

The reflection member 7 transmits light from the lens member 6 (LED package 4) and light emitted from the lens member 6 (LED package 4) and reflected by the diffusion plate 8 (reflection layer 11 described later) to the upper side (diffuse). It has a function of reflecting on the plate 8 side.

The diffusing plate 8 is disposed on the opposite side of the light incident surface 8a where the light from the lens member 6 (LED package 4) and the like is incident, and emits light upward (the liquid crystal display panel 2 side). And a function of diffusing light. The light incident surface 8a is an example of the “first light incident surface” in the present invention, and the light emitting surface 8b is an example of the “first light emitting surface” in the present invention.

Here, in the first embodiment, the light shielding film 10 is provided on the light incident surface 8 a of the diffusion plate 8. As shown in FIG. 4, the light-shielding film 10 is disposed on the side of the diffuser plate 8 that is opposite to the diffuser plate 8, and the transparent support 11 is formed in close contact with the reflective layer 11. Layer 12. That is, the reflective layer 11 is disposed between the diffusion plate 8 and the support layer 12. The reflective layer 11 is an example of the “light shielding layer” in the present invention.

The reflective layer 11 is formed on one surface (the surface on the diffusion plate 8 side) of the support layer 12 by printing (for example, screen printing or inkjet printing). And as shown in FIG. 3, the light shielding film 10 is affixed on the diffusion plate 8 by thermocompression bonding, for example.

The reflection layer 11 is provided on the entire surface of the light incident surface 8a of the diffusion plate 8. That is, the reflective layer 11 is provided on the surface of at least the portion of the diffuser plate 8 that faces the lens member 6 (LED package 4).

In the first embodiment, the reflective layer 11 is formed of, for example, white ink having a predetermined thickness, and has a function of reflecting at least a part of light. Further, the reflective layer 11 is uniformly disposed on the light incident surface 8 a of the diffusion plate 8.

Specifically, the reflective layer 11 may be formed with a uniform thickness. Moreover, the reflective layer 11 may be formed in a solid shape without a gap, or may be uniformly dispersed.

In addition, when the reflective layer 11 is formed in a solid shape, the reflective layer 11 needs to have a function of transmitting at least part of light. In this case, the reflective layer 11 may be formed thin, for example, or may be formed in a semi-transparent white by reducing white particles (not shown) contained in the ink.

When the reflective layer 11 is uniformly dispersed, for example, the reflective layer 11 may be formed by arranging a large number of small ink layers without contacting each other, or a small through hole (not shown). The reflective layer 11 (ink layer) may be formed in a mesh shape so that a large number of In this case, the reflective layer 11 (ink layer) may or may not have a function of transmitting part of the light.

Further, the light shielding film 10 is formed using the same material as the diffusion plate 8. Specifically, the support layer 12 is formed of the same material (resin) as the diffusion plate 8, and the support layer 12 has the same thermal expansion coefficient as that of the diffusion plate 8. The reflective layer 11 may also be formed of the same material (resin) as the diffuser plate 8. Further, the light shielding film 10 may have the same thermal expansion coefficient as that of the diffusion plate 8.

In the first embodiment, the optical sheet 13 is disposed between the diffusion plate 8 and the liquid crystal display panel 2. The optical sheet 13 has at least one of a function of condensing the light transmitted through the diffusion plate 8 and a function of diffusing the light transmitted through the diffusion plate 8.

Specifically, the optical sheet 13 may be formed of a lens sheet such as a lenticular or microlens sheet, for example. In this case, the optical sheet 13 may be formed so that the light incident on the optical sheet 13 is once diffused and condensed when emitted to the liquid crystal display panel 2 side.

Further, the optical sheet 13 may be formed of, for example, a diffusion sheet having a function of diffusing incident light. The optical sheet 13 may be formed of a plurality of sheet materials including a microlens sheet and a diffusion sheet.

Next, the progression of light emitted from the LED package 4 will be described with reference to FIGS.

As shown in FIG. 3, the light P1 emitted obliquely upward (obliquely forward) from the LED package 4 is refracted outward by the recess 6e and further refracted outward by the light exit surface 6c. That is, the light P <b> 1 emitted from the LED package 4 is enlarged (diffused) by the lens member 6.

On the other hand, the light P2 emitted from the LED package 4 substantially upward is refracted by the lens member 6 only slightly. For this reason, the light which reaches | attains the part 11a which opposes the LED package 4 among the reflective layers 11 is another part (parts which oppose the area | region between adjacent LED packages 4 etc.) among the reflective layers 11. ) More (stronger) than light reaching 11b.

In the first embodiment, much of the light that reaches the reflective layer 11 is reflected downward. At this time, the light is reflected while being diffused (scattered) by white particles (not shown) contained in the ink.

Thereafter, as shown in FIG. 5, the light reflected by the reflective layer 11 is incident on the lens member 6 again, and the spread angle of the light is increased again (diffused).

Thereby, the light reaching the diffusion plate 8 is transmitted through the diffusion plate 8 in a sufficiently diffused state. Then, the light reaches the liquid crystal display panel 2 in a sufficiently uniform state.

In the first embodiment, as described above, the lens member 6 that increases the light divergence angle is disposed on the light emission side of the LED package 4 to increase the divergence angle of the light emitted from the LED package 4. The diffusion plate 8 can be reached in a state (diffused state). Thereby, it is possible to suppress the occurrence of uneven brightness in the liquid crystal display panel 2.

In the first embodiment, as described above, the reflective layer 11 is provided on the surface of at least the portion of the diffuser plate 8 that faces the LED package 4. Thereby, at least a part of the light traveling toward the portion of the diffusion plate 8 facing the LED package 4 can be shielded (reflected). For this reason, the light diffusion by the lens member 6 is not sufficient, and the amount of light traveling toward the portion of the diffusion plate 8 facing the LED package 4 is larger than the light traveling toward the other portion. Even in the (strong) case, it is possible to suppress that the light emitted from the portion of the diffusion plate 8 facing the LED package 4 is more (strong) than the light emitted from the other portion. it can. Thereby, it is possible to further suppress the occurrence of luminance unevenness in the liquid crystal display panel 2.

As a result, even if the thickness of the backlight device 3 is reduced or the interval between the LED packages 4 (light sources) is increased, it is possible to suppress the occurrence of uneven brightness in the liquid crystal display panel 2.

In the first embodiment, as described above, the reflective layer 11 having a function of reflecting at least part of the light is provided. Thereby, the light reflected by the reflective layer 11 can be incident on the lens member 6 again, and the spread angle can be increased (diffused) again. Thereby, since the light can be made to reach the diffusion plate 8 in a more diffused state, it is possible to further suppress the occurrence of luminance unevenness in the liquid crystal display panel 2. In addition, the light use efficiency can be improved as compared with the case where the reflective layer 11 has a function of absorbing light.

In the first embodiment, since light can be sufficiently diffused, two or more kinds of light emitted from the LED package 4 can be sufficiently mixed. Thereby, it is possible to suppress the occurrence of color unevenness in the liquid crystal display panel 2.

In the first embodiment, as described above, by providing the backlight device 3 with the diffusion plate 8, the light emitted from the LED package 4 can be further diffused by the diffusion plate 8. Thereby, it is possible to further suppress the occurrence of luminance unevenness in the liquid crystal display panel 2.

In addition, the direct-type backlight device 3 is more likely to cause uneven brightness in the liquid crystal display panel 2 than the edge-light type backlight device. For this reason, it is particularly effective to apply the present invention when the direct type backlight device 3 is used.

Further, in the first embodiment, as described above, the reflective layer 11 is provided uniformly. Thereby, the reflective layer 11 can be easily formed on the surface of the diffusion plate 8 (the surface of the support layer 12).

Further, in the first embodiment, as described above, the light shielding film 10 including the reflective layer 11 and the support layer 12 formed by closely attaching the reflective layer 11 is provided. Accordingly, the light shielding film 10 in which the reflective layer 11 is formed on the surface of the support layer 12 is brought into close contact with the surface of the diffusion plate 8 (attached), whereby the reflective layer 11 can be easily attached to the surface of the diffusion plate 8. Can be provided.

In the first embodiment, as described above, the light shielding film 10 is formed using the same material as the diffusion plate 8. As a result, it is possible to suppress an increase in the difference in coefficient of thermal expansion between the light shielding film 10 and the diffusion plate 8, so that when the light shielding film 10 and the diffusion plate 8 become high temperature, the light shielding film 10 and the diffusion plate are diffused. It is possible to suppress the warpage of the plate 8.

In the first embodiment, the lens member 6 is attached to the mounting substrate 5 as described above. Thereby, since it is not necessary to align the LED package 4 and the lens member 6 after the lens member 6 is attached to the mounting substrate 5, it is possible to prevent the assembly process of the backlight device 3 from becoming complicated. it can. Moreover, it can suppress that position shift generate | occur | produces between the LED package 4 and the lens member 6. FIG.

In the first embodiment, the optical sheet 13 is disposed between the diffusion plate 8 and the liquid crystal display panel 2 as described above. Thereby, when the optical sheet 13 has a function of condensing the light transmitted through the diffusion plate 8 (when the optical sheet 13 is, for example, a lens sheet), the luminance in the front direction of the liquid crystal display panel 2 can be improved. it can. Further, when the optical sheet 13 has a function of diffusing the light transmitted through the diffusion plate 8 (when the optical sheet 13 is a lens sheet or a diffusion sheet having a function of diffusing the incident light), the liquid crystal display panel 2 is provided. The occurrence of uneven brightness can be further suppressed.

(Second Embodiment)
In the second embodiment, with reference to FIGS. 6 to 8, unlike the first embodiment, the case where the reflective layer 111 is provided unevenly on the light incident surface 8a of the diffusion plate 8 will be described. .

In the liquid crystal display device according to the second embodiment of the present invention, a light shielding film 110 is provided on the light incident surface 8a of the diffusion plate 8, as shown in FIG. The light shielding film 110 includes a reflective layer 111 disposed on the diffusion plate 8 side and a transparent support layer 12 disposed on the side opposite to the diffusion plate 8. The reflective layer 111 is an example of the “light shielding layer” in the present invention.

Here, in the second embodiment, a portion (a portion directly above the LED package 4) 111a of the reflective layer 111 that faces the LED package 4 is a portion 111b of the reflective layer 111 other than the portion 111a. Compared with 111c and 111d, it is formed so as to reflect (shield) light more. That is, the reflective layer 111 is non-uniformly disposed on the light incident surface 8 a of the diffuser plate 8. The portion 111a is an example of the “first portion” in the present invention, and the

portions

111b, 111c, and 111d are examples of the “second portion” in the present invention.

Specifically, the portion of the reflective layer 111 that faces the LED package 4 (the portion directly above the LED package 4) 111a emits light compared to the portion 111b that surrounds the portion 111a of the reflective layer 111. It is formed so as to be more reflective (shielded). Further, the portion 111b of the reflective layer 111 is formed so as to reflect (shield) light more than the portion 111c of the reflective layer 111 surrounding the portion 111b. Further, the portion 111c of the reflective layer 111 reflects (shields) light more than the portion (the portion other than the

portions

111a, 111b, and 111c) 111d that surrounds the portion 111c of the reflective layer 111. Is formed.

In the case where the portion 111a is formed so as to reflect light more than the

portions

111b, 111c, and 111d, the formation area of the ink layer per unit area in the portion 111a is the

portions

111b, 111c, and 111d. The reflective layer 111 may be formed so as to be larger than the formation area of the ink layer per unit area. Further, the reflective layer 111 is formed so that the thickness of the portion 111a (the thickness of the ink layer in the portion 111a) is larger than the thickness of the

portions

111b, 111c, and 111d (the thickness of the ink layer in the

portions

111b, 111c, and 111d). It may be formed. For example, the ink layer may not be provided in the portion 111d.

More specifically, in the second embodiment, a diffuser plate 8 on which the reflective layer 111 (light shielding film 110) is not provided is disposed on the LED package 4 and the lens member 6, and light transmitted through the diffuser plate 8 is transmitted. The amount (strength) was determined by simulation. The result is shown in FIG. FIG. 7 shows the amount (intensity) of light transmitted through the portion of the diffuser plate 8 directly above the region including the set of the LED package 4 and the lens member 6. Further, FIG. 7 shows that the amount of transmitted light increases (the intensity of light increases) from black to white.

As shown in FIG. 7, a portion of the diffuser plate 8 directly above the central portion of the LED package 4 and the lens member 6 (the central portion in FIG. 7) has a large amount of light to be transmitted (the light intensity is high). High).

And in 2nd Embodiment, as shown in FIG. 8, the reflection layer 111 is printed on the support layer 12 so that the brightness irregularity (black-and-white of FIG. 7) which generate | occur | produces in the diffuser plate 8 may be negative-positive-inverted. That is, the density of the reflective layer 111 (the formation area of the ink layer per unit area (or the thickness of the ink layer)) gradually decreases from the portion directly above the central portion of the LED package 4 and the lens member 6 toward the outside. As shown, a light shielding film 110 is formed. FIG. 8 shows that the density of the reflective layer 111 decreases as the color changes from black to white.

The remaining structure of the second embodiment is the same as that of the first embodiment.

In the second embodiment, as described above, the portion 111a of the reflective layer 111 facing the LED package 4 is made to emit light compared to the

portions

111b, 111c, and 111d of the reflective layer 111 other than the portion 111a. It is formed so as to be more reflective. Thereby, it can suppress more that the light which injects into the part which opposes the LED package 4 among the diffusion plates 8 increases (strong) compared with the light which injects into another part. Thereby, it is possible to further suppress the occurrence of luminance unevenness in the liquid crystal display panel 2.

The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
In the third embodiment, a case where the present invention is applied to an edge-light type backlight device 203 will be described with reference to FIGS. 9 and 10, unlike the first and second embodiments.

As shown in FIG. 9, the liquid crystal display device 201 according to the third embodiment of the present invention includes a liquid crystal display panel 2 and a backlight device 203 that illuminates the liquid crystal display panel 2. The liquid crystal display device 201 is an example of the “display device” in the present invention, and the backlight device 203 is an example of the “illumination device” in the present invention.

Here, in the third embodiment, the backlight device 203 is an edge light type backlight device, and includes a plurality of LED packages 4, a mounting substrate 5, a plurality of lens members 6, a reflecting member 207, and a lens. A light guide plate 208 that guides light from the member 6 (LED package 4) and emits the light to the liquid crystal display panel 2 side, and the backlight chassis 9 are included.

As shown in FIG. 10, the plurality of LED packages 4 are arranged, for example, in the short side direction (B direction) of the liquid crystal display panel 2 (see FIG. 9).

The lens member 6 is disposed on the light emission side (light guide plate 208 side) of the LED package 4.

As shown in FIG. 9, the reflecting member 207 is light from the lens member 6 (LED package 4), light emitted from the lens member 6 (LED package 4) and reflected by the light guide plate 208 (reflecting layer 211 described later). And the light emitted from the light guide plate 208 to the back side has a function of reflecting the light guide plate 208 side.

The light guide plate 208 includes a light incident surface 208a on which light from the lens member 6 (LED package 4) or the like is incident, and a light emitting surface 208b extending in a direction orthogonal to (intersects with) the light incident surface 208a. Yes. The light incident surface 208a is an example of the “second light incident surface” in the present invention, and the light emitting surface 208b is an example of the “second light emitting surface” in the present invention.

Here, in the third embodiment, as shown in FIG. 10, a light shielding film 210 is provided on the light incident surface 208 a of the light guide plate 208. The light shielding film 210 includes a reflective layer 211 disposed on the light guide plate 208 side and a transparent support layer 212 disposed on the side opposite to the light guide plate 208. That is, the reflective layer 211 is disposed between the light guide plate 208 and the support layer 212. The reflective layer 211 is an example of the “light shielding layer” in the present invention.

The reflective layer 211 may be arranged uniformly on the light incident surface 208a of the light guide plate 208, as in the reflective layer 11 of the first embodiment, or the reflective layer 111 of the second embodiment. As described above, the light guide plate 208 may be non-uniformly disposed on the light incident surface 208a.

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

In the third embodiment, as described above, by providing the lens member 6 that increases the light spread angle and the reflective layer 111 that reflects at least a part of the light, the light emitted from the LED package 4 is sufficiently Since the light guide plate 208 can reach the light guide plate 208 in the diffused state, when the edge light type backlight device 203 is used, the vicinity of the LED package 4 in the liquid crystal display panel 2 is the other part. It is possible to suppress brightening compared to.

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

In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims, and further includes meanings equivalent to the scope of claims and all modifications within the scope.

For example, in the above-described embodiment, an example in which the display device is applied to a liquid crystal display device has been described. However, the present invention is not limited thereto, and may be applied to a display device other than the liquid crystal display device.

Moreover, in the said embodiment, although the backlight apparatus which illuminates a display panel was demonstrated as an example of an illuminating device, this invention is applicable not only to this but the illuminating device which illuminates to-be-illuminated members other than a display panel. It is.

In the above embodiment, the example in which the reflective layer (light shielding film) is provided on the light incident surface of the diffusion plate or the light guide plate has been described. However, the present invention is not limited thereto, and the reflective layer (light shielding film) is diffused. You may provide in the light-projection surface of a board or a light-guide plate. Moreover, you may provide a reflection layer (light-shielding film) in both a light-incidence surface and a light-projection surface.

In the above embodiment, the example in which the reflective layer is disposed between the diffusion plate or the light guide plate and the support layer (on the surface of the support layer on the side of the diffusion plate or the light guide plate) has been described. However, the reflective layer may be disposed on the surface of the support layer opposite to the diffusion plate or the light guide plate. Moreover, you may arrange | position a reflection layer on both surfaces of a support layer.

Moreover, in the said embodiment, although the example which provided the light shielding film which consists of a reflection layer and a support layer on the surface of the diffusion plate or the light-guide plate was shown, this invention is not restricted to this, The surface of a diffusion plate or a light-guide plate is shown. Only the reflective layer may be provided. In this case, the reflective layer may be directly formed on the surface of the diffusion plate or the light guide plate by, for example, printing (screen printing, ink jet printing, or the like).

In the above embodiment, an example in which the optical sheet is disposed between the diffusion plate or the light guide plate and the liquid crystal display panel has been described. However, the present invention is not limited thereto, and the diffusion plate or the light guide plate and the liquid crystal display panel It is not necessary to arrange an optical sheet between them.

In the above-described embodiment, an example in which a reflection layer that reflects at least part of light is provided as the light shielding layer is described. However, the present invention is not limited thereto, and at least part of light is absorbed as the light shielding layer. An absorption layer (for example, a black ink layer) may be provided. In this case as well, it is possible to suppress a large amount (intensity) of light emitted from a predetermined portion of the diffusion plate or the light guide plate, thereby suppressing occurrence of uneven brightness in the liquid crystal display panel (illuminated member). can do.

1,201 Liquid crystal display device (display device)
2 Liquid crystal display panel (display panel)
3, 203 Backlight device (lighting device)
4 LED package (package)
4a Light emitting element 5 Mounting substrate 6 Lens member 8 Diffuser plate 8a Light incident surface (first light incident surface)
8b Light exit surface (first light exit surface)
10, 110, 210 Light-shielding

film

11, 111, 211 Reflective layer (light-shielding layer)
12, 212 Support layer 13 Optical sheet 111a part (1st part)
111b, 111c, 111d part (second part)
208 Light guide plate 208a Light incident surface (second light incident surface)
208b Light exit surface (second light exit surface)

Claims

A package including a light emitting element and functioning as a light source;
A lens member that is disposed on the light exit side of the package and increases the spread angle of the light emitted from the package;
A diffusion plate or a light guide plate on which light emitted from the lens member is incident;
A light shielding layer provided on the surface of the diffusion plate or the light guide plate and having a function of shielding at least a part of the light;
The light-shielding layer is provided on a surface of at least a portion of the diffusion plate or the light guide plate facing the package.
The lighting device according to claim 1, wherein the light shielding layer has a function of reflecting at least part of light.
The illuminating device according to claim 1 or 2, further comprising the diffusion plate on which light emitted from the lens member is incident.
The diffusion plate includes a first light incident surface on which light emitted from the package is incident, and a first light emitting surface disposed on the opposite side of the first light incident surface,
The lighting device according to claim 3, wherein the light shielding layer is provided on at least one of the first light incident surface and the first light emitting surface.
The illumination device according to claim 1, further comprising the light guide plate on which light emitted from the lens member is incident.
The light guide plate includes a second light incident surface on which light emitted from the package is incident, and a second light emitting surface extending in a direction intersecting the second light incident surface,
The lighting device according to claim 5, wherein the light shielding layer is provided on at least one of the second light incident surface and the second light emitting surface.
The lighting device according to any one of claims 1 to 6, wherein the light shielding layer is provided uniformly on the surface.
The lighting device according to claim 7, wherein the light shielding layer is formed in a solid shape and has a function of transmitting part of light.
The lighting device according to claim 7, wherein the light shielding layer is uniformly dispersed.
The light shielding layer is provided unevenly on the surface,
The first portion of the light shielding layer facing the package further shields light compared to the second portion of the light shielding layer other than the first portion. The lighting device according to any one of 6.
The lighting device according to any one of claims 1 to 10, further comprising a light-shielding film including the light-shielding layer and a support layer formed by closely contacting the light-shielding layer.
The lighting device according to claim 11, wherein the light shielding film is formed using the same material as the diffusion plate or the light guide plate.
A mounting board to which the package is attached;
The lighting device according to any one of claims 1 to 14, wherein the lens member is attached to the mounting substrate.
5. The optical sheet according to claim 3, further comprising an optical sheet having at least one of a function of condensing light transmitted through the diffusion plate and a function of diffusing light transmitted through the diffusion plate. Lighting equipment.
The optical sheet having at least one of a function of condensing the light transmitted through the light guide plate and a function of diffusing the light transmitted through the light guide plate is further provided. Lighting equipment.
The lighting device according to any one of claims 1 to 15,
A display device comprising a display panel illuminated by the illumination device.