WO2012165280A1

WO2012165280A1 - Illumination device, display device, and television reception device

Info

Publication number: WO2012165280A1
Application number: PCT/JP2012/063288
Authority: WO
Inventors: 昌宏霜出
Original assignee: シャープ株式会社
Priority date: 2011-05-31
Filing date: 2012-05-24
Publication date: 2012-12-06

Abstract

This backlight device (12) comprises: a cold-cathode tube (18); a diffusion plate (16a), which is a first optical member, having a light entry surface (16a2) through which light from the cold-cathode tube (18) enters and a light exit surface (16a3) through which light that has entered from the light entry surface (16a2) exits; an optical sheet (16b), which is a second optical member, arranged on the light exit surface (16a3) of the diffusion plate (16a); a chassis (14) for housing at least the cold-cathode tube (18); and a plurality of penetrating members (32) that penetrate the optical sheet (16b) and the diffusion plate (16a) and that are secured to the chassis (14). Each of the penetrating members (32) penetrating the diffusion plate (16a) and the second optical sheet (16b) is secured to the chassis (14), thereby making it possible to effectively prevent or minimize positional displacement between the diffusion plate (16a) and the optical sheet (16b), and prevent or minimize defects such as reduced brightness.

Description

Lighting device, display device, and television receiver

The present invention relates to a lighting device, a display device, and a television receiver.

In recent years, display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display devices to which thin display elements such as liquid crystal panels and plasma display panels are applied. Is possible. The liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light.

In the backlight device, a light source is housed in a chassis as a housing, and a light incident surface on which light from the light source is incident on the light emitting side of the light source, and light output from which light incident from the light incident surface is emitted. A first optical member having a surface may be disposed, and a second optical member may be disposed on the light exit surface of the first optical member. For example, in a direct-type backlight device, a diffusion plate that diffuses light from a light source is disposed as a first optical member on the front side of the chassis, a light source is disposed directly below the diffusion plate, and an optical is provided on the light exit surface of the diffusion plate. A sheet is disposed as the second optical member. Further, in the edge light type backlight device, a light guide plate that guides light from the light source is arranged in the chassis as the first optical member, a light source is arranged on the side of the light guide plate, and the light exit surface of the light guide plate An optical sheet is arranged on the top as a second optical member.

Patent Document 1 discloses a direct-type backlight device that includes a diffusion plate and an optical sheet disposed on a light exit surface of the diffusion plate. In this backlight device, pins that penetrate the optical sheet and the diffusion plate in the thickness direction are arranged. The pin is fitted and fixed in a pin hole provided on the chassis. For this reason, in this backlight device, the positional deviation of the optical sheet due to vibration or the like is prevented by the pins.

JP 2008-76899 A

(Problems to be solved by the invention)
However, in the backlight device of Patent Document 1, only one pin passes through the optical sheet and the diffusion plate and is fixed to the chassis, and the optical sheet is supported at only one point. There may be a case where misalignment cannot be prevented. Also, as the size of the chassis increases, the size of the diffusing plate and the optical sheet increases. Therefore, if the optical sheet is supported at only one point, the large backlight device can sufficiently prevent the optical sheet from being displaced. It may not be possible to suppress it. If the optical sheet is misaligned, the surface of the optical sheet may be damaged, and a defect such as a decrease in luminance may occur.

The invention disclosed in this specification has been created in view of the above problems. An object of the invention disclosed in this specification is to provide an illuminating device that can prevent or suppress a defect such as a decrease in luminance due to damage or the like of an optical member.

(Means for solving problems)
The technology disclosed in the present specification includes a first optical member having a light source, a light incident surface on which light from the light source is incident, and a light exit surface on which light incident from the light incident surface is emitted. And a second optical member disposed on the light exit surface of the first optical member, a housing member that houses at least the light source, the second optical member, and the first optical member. And a plurality of penetrating members fixed to the housing member.

According to the illumination device, the plurality of penetrating members that penetrate the first optical member and the second optical member are respectively fixed to the housing member, whereby the first optical member and the second optical member are Since the shift in the planar direction is suppressed by the penetrating member, it is possible to prevent or suppress the positional shift between the first optical member and the second optical member. Furthermore, since a plurality of penetrating members are arranged, positional deviation between the first optical member and the second optical member is effectively prevented or suppressed as compared with a configuration in which one penetrating member is arranged. can do. As a result, it is possible to prevent or suppress the occurrence of defects such as a decrease in luminance due to damage to the optical member.

The second optical member may have a square shape in plan view, and the penetrating member may be disposed at two corners that are diagonal positions among the four corners of the second optical member in plan view. Good.
According to this configuration, since the distance between the two penetrating members can be increased, the first optical member and the second optical member can be compared with the case where the two penetrating members are arranged close to each other. Can be prevented or suppressed more effectively.

Through holes may be provided at two positions through which the penetrating member of the second optical member penetrates, and the openings of the two through holes may have different shapes in plan view.
According to this configuration, the top and bottom and front and back directions of the second optical member can be confirmed by the difference in the shape of the two through holes.

The penetrating member is disposed at a shaft portion penetrating the second optical member and the optical member, and an end portion of the penetrating member on the opposite side to the side fixed to the housing member. You may have a curvature part larger than a shaft part.
According to this configuration, since the warped portion comes into contact with the second optical member, vibration in the thickness direction of the second optical member and the first optical member can be prevented or suppressed.

The warped portion of the penetrating member may have a folded portion that is folded back toward the second optical member.
According to this configuration, the folded portion folded back to the second optical member side can easily come into contact with the second optical member, so that vibrations in the thickness direction of the second optical member and the first optical member can be further prevented. Can be suppressed.

The tip of the folded portion on the second optical member side may be curved.
According to this structure, when the front-end | tip of a folding | turning part contact | abuts with a 2nd optical member, it can prevent thru | or suppress that a 2nd optical member is damaged.

A frame-shaped member that covers an edge of the upper surface of the second optical member; and the warped portion is disposed between the second optical member and the frame-shaped member, and the upper surface is It may be parallel to the frame member.
According to this configuration, when the upper surface of the warped portion comes into contact with the frame-like member, it comes into contact with the surface, so that the penetrating member is prevented or suppressed from shaking when the warped portion comes into contact with the frame-like member. Can do.

A fitting hole is provided at a position where the penetrating member of the housing member is fixed, and the penetrating member is fixed to the housing member by fitting an end portion on the housing member side into the fitting hole. It may be.
According to this configuration, a specific configuration for fixing the penetrating member to the housing member can be realized.

The first optical member may be a plate shape, and the second optical member may be a sheet shape having a thickness smaller than that of the first optical member.
According to this configuration, it is possible to prevent or suppress the sheet-like second optical member from being damaged or the generation of powdered foreign substances due to the positional displacement between the first optical member and the second optical member. be able to.

The housing member includes a bottom plate, a side plate rising from an end edge of the bottom plate, and an extending portion extending outward from a front end of the side plate, and the first optical member diffuses light from the light source. While being made into a diffuser plate, it is mounted on the extension part, the second optical member may be an optical sheet, and the penetrating member may be fixed to the extension part.
According to this configuration, in the direct type backlight device, it is possible to prevent or suppress the positional deviation between the diffusion plate and the optical sheet.

The first optical member is a light guide plate that guides light from the light source, the light incident surface is provided on a side surface thereof, the light exit surface is provided on one plate surface thereof, and the second optical member is provided. The optical member may be an optical sheet, a reflective sheet may be disposed on a plate surface side opposite to the light exit surface of the first optical member, and the penetrating member may penetrate the reflective sheet.
According to this configuration, in the edge light type illumination device, it is possible to prevent or suppress the positional deviation between the light guide plate and the optical sheet.

The technology disclosed in the present specification may be a display device including a display panel that performs display using light from the above-described illumination device. A display device in which the above-described display panel is a liquid crystal panel using liquid crystal is also new and useful. A television receiver provided with the above display device is also new and useful.

(The invention's effect)
According to the technology disclosed in this specification, it is possible to provide an illumination device that can prevent or suppress the occurrence of defects such as a decrease in luminance due to damage to an optical member.

1 is an exploded perspective view of a television receiver TV according to Embodiment 1. FIG. An exploded perspective view of the liquid crystal display device 10 is shown. A cross-sectional view of the liquid crystal display device 10 is shown. FIG. 3 shows an enlarged cross-sectional view of the vicinity of the penetrating member 32. The top view of the optical sheet 16b is shown. Sectional drawing of the vicinity of the site | part in which the penetration member 132 was distribute | arranged in the backlight apparatus 112 which concerns on Embodiment 2 is shown. Sectional drawing of the vicinity of the site | part in which the penetration member 232 was distribute | arranged in the backlight apparatus 212 which concerns on Embodiment 3 is shown.

<Embodiment 1>
Embodiment 1 will be described with reference to the drawings. A part of each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn in a common direction in each drawing. Among these, the Y-axis direction coincides with the vertical direction, and the X-axis direction coincides with the horizontal direction.

FIG. 1 is an exploded perspective view of the television receiver TV according to the first embodiment. The television receiver TV includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the display device D, a power source P, a tuner T, and a stand S. The liquid crystal display device 10 has a horizontally long rectangular shape as a whole and is accommodated in a vertically placed state.

FIG. 2 is an exploded perspective view of the liquid crystal display device 10. FIG. 3 shows a cross-sectional view of a cross section of the liquid crystal display device 10 cut in the vertical direction (Y-axis direction) so as to cut one of penetrating members 32 described later. Here, the upper side shown in FIGS. 2 and 3 is the front side, and the lower side shown in FIGS. 2 and 3 is the back side. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device 12 that is an external light source, and these are integrally held by a bezel 13 or the like having a frame shape. It is like that.

First, the liquid crystal panel 11 will be described. The liquid crystal panel 11 is bonded to a pair of transparent (having high translucency)

glass substrates

20 and 30 with a predetermined gap therebetween, and a liquid crystal layer (not shown) between the

glass substrates

20 and 30. It is set as the structure enclosed. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. Of these, image data and various control signals necessary for displaying an image are supplied to a source wiring, a gate wiring, a counter electrode, and the like from a drive circuit board (not shown). A pair of front and back polarizing plates 22 are attached to the outer surface sides of both the

substrates

20 and 30, respectively.

Subsequently, the backlight device 12 will be described. Here, FIG. 4 shows an enlarged cross-sectional view of the vicinity of the penetrating member 32 in FIG. The backlight device 12 is a so-called direct-type backlight in which a light source is arranged directly under the back surface of the liquid crystal panel 11. The reflection sheet 15 to be laid, the optical member 16 attached to the light emitting side of the chassis 14, a frame 17 that forms a frame and supports the optical member 16 along the inner edge, and is accommodated in parallel in the chassis 14. The plurality of cold cathode tubes 18 and a lamp holder 19 that shields the end portion of the cold cathode tubes 18 and has light reflectivity are provided.

The chassis 14 is made of, for example, a metal such as an aluminum material, and includes a bottom plate 14a, a side plate 14b, and a receiving plate 14c. The bottom plate 14 a has a horizontally long rectangular shape, similar to the liquid crystal panel 11, and is disposed on the opposite side of the optical member 16 with the cold cathode tube 18 interposed therebetween. The side plate 14b rises from the outer edge on the long side of the bottom plate 14a and is inclined outward with respect to the bottom plate 14a. The receiving plate 14c projects outward from the rising ends of the two side plates 14b, and the optical member 16 is placed on the front side. The frame 17 is fixed to the receiving plate 14c by being screwed to the receiving plate 14c. The long side direction of the chassis 14 coincides with the X-axis direction (horizontal direction), and the short side direction thereof coincides with the Y direction (vertical direction).

The reflection sheet 15 is composed of a resin sheet or the like having light reflectivity, and is laid along the inner surface of the chassis 14, and the light emitted from the cold cathode tube 18 is directed to the optical member 16 side (light emission side). It has a function of reflecting. On the side plate 14b side of the chassis 14, the reflection sheet 15 is erected and laid along the side plate 14b of the chassis 14, and extends outward from the rising end of the side plate 14b and is placed on the receiving plate 14c. ing.

The optical member 16 includes a diffusion plate 16a placed on the receiving plate 14c of the chassis 14 with the reflection sheet 15 interposed therebetween, and an optical sheet 16b disposed on the light output surface 16a3 side (front side) of the diffusion plate 16a. (See FIG. 4). The diffusion plate 16a is formed by dispersing and scattering light scattering particles in a synthetic resin plate-like member, and has a function of diffusing light emitted from the cold cathode tube 18 and reflects the emitted light from the cold cathode tube 18. The light reflection function is also used. In addition, in the state shown in FIG. 4, the diffusion plate 16a has a back surface that is a light incident surface 16a2 where light from the cold cathode tube 18 enters, and a light exit surface 16a3 that emits light that is incident on the front surface. ing. The optical sheet 18b is formed by laminating a diffusion sheet, a lens sheet, and a reflective polarizing plate in order from the diffusion plate 16a side, and the light emitted from the cold cathode tube 18 and passed through the diffusion plate 18a is planar light. It has the function.

Subsequently, a configuration for preventing a positional deviation between the diffusion plate 16a and the optical sheet 16b, which is a main part of the present embodiment, will be described. As shown in FIG. 2, in the backlight device 12, it penetrates through the end side of one receiving plate 14 c and the end side of the other receiving plate 14 c so as to be positioned diagonally to the chassis 14 in plan view. Each member 32 is arranged. As shown in FIG. 4, the penetrating member 32 penetrates the optical member 16 on the end side of the receiving plate 14c and is fixed to the receiving plate 14c. Specifically, through holes 16b1, 16a1, and 15a are provided at positions overlapping the positions where the penetrating member 32 is disposed in each of the optical sheet 16b, the diffusion plate 16a, and the reflecting sheet 15, and the penetrating member 32 passes through the penetrating member 32. The holes 16b1, 16a1, and 15a are arranged so as to penetrate therethrough. Further, a fitting hole 14c1 is provided at a position overlapping the position where the penetrating member 32 of the receiving plate 14c is disposed, and one end of the penetrating member 32 penetrating the optical sheet 16b, the diffusion plate 16a, and the reflecting sheet 15 is provided. It is fitted in this fitting hole 14c1.

First, the configuration of the penetrating member 32 will be described. As shown in FIG. 4, the penetrating member 32 includes a shaft-shaped shaft portion 32 a that passes through the through-holes 16 b 1, 16 a 1, and 15 a and an end portion on the opposite side to the side fixed to the receiving plate 14 c of the shaft portion 32 a. It is comprised from the curvature part 32b provided in this. The shaft portion 32a passes through each of the through holes 16b1, 16a1, and 15a, and one end portion thereof is exposed on the front side of the optical sheet 16b. A warped portion 32b is provided on the one end portion. The diameter of the shaft portion 32a is slightly smaller than the diameter of each through-hole 16b1, 16a1, 15a, and can be inserted into each through-hole 16b1, 16a1, 15a. On the other hand, the warped portion 32b has a substantially square top surface in plan view, and the size of one side is larger than the diameter of each of the through holes 16b1, 16a1, and 15a. The diameter of the fitting hole 14c1 provided in the receiving plate 14c is substantially the same as the diameter of the shaft portion 32a, and the tip of the penetrating member 32 (the side on which the warped portion 32b of the shaft portion 32a is provided) The end of the penetrating member 32 can be fixed to the fitting hole 14c1 by fitting the opposite end) into the fitting hole 14c1.

Thus, since the penetrating member 32 penetrating each through-hole 16b1, 16a1, 15a is fixed to the receiving plate 14c1, the optical sheet 16b and the diffusing plate 16a are arranged in the plane direction (X-axis-Y-axis plane) by the penetrating member 32. Misalignment in the direction) is prevented or suppressed. Further, even when the optical sheet 16b and the diffusion plate 16a are moved in the thickness direction due to vibration or the like, the surface of the optical sheet 16b is in contact with the warped portion 32b larger than each through-hole 16b1, 16a1, 15a. The optical sheet 16b and the diffusion plate 16a are prevented from moving in the thickness direction.

As shown in FIG. 4, the bent portion 32 b of the penetrating member 32 is further provided with a folded portion 32 b 1 that is folded back on the surface side of the optical sheet 16 b. The leading end surface of the folded portion 32b1 facing the surface side of the optical sheet 16b is arranged slightly spaced from the surface of the optical sheet 16b. Moreover, the said front end surface of the folding | turning part 32b1 is made into the curved surface form (refer FIG. 4). By providing such a folded portion 32b1, when the optical sheet 16b moves in the thickness direction (Z-axis direction) due to vibration or the like, the surface of the optical sheet 16b comes into contact with the front end surface of the folded portion 32b1. Therefore, the optical sheet 16b is restrained from moving further in the thickness direction. Further, since the front end surface of the folded portion 32b1 is curved as described above, even when the surface of the optical sheet 16b is in contact with the front end surface of the folded portion 32b1, the surface of the optical sheet 16b is hardly damaged. It has become.

As shown in FIG. 2, the two penetrating members 32 are arranged so as to be positioned diagonally to the chassis 14 in a plan view, and the other penetrating member 32 has the same configuration. . Further, in each of the optical sheet 16 b, the diffusion plate 16 a, and the reflection sheet 15, a through hole similar to the above is provided at a position overlapping the other penetrating member 32.

Also, as shown in FIG. 4, the upper surface of the warped portion 32b of the penetrating member 32 and the portion 17a located on the front side of the penetrating member 32 of the frame 17 are both planar and are arranged so as to be parallel to each other. Has been. For this reason, even when the upper surface of the warped portion 32b is in contact with the portion 17a of the frame 17, the upper surface of the warped portion 32b and the portion 17a of the frame 17 are in contact with each other, and the penetrating member 32 is difficult to rattle.

Subsequently, the shape and arrangement of the through holes 16b1 and 16b2 provided in the optical sheet 16b will be described. Here, FIG. 5 shows a plan view of the optical sheet 16b. As shown in FIG. 5, the optical sheet 16b is provided with two through holes 16b1 and 16b2. The two through holes 16b1 and 16b2 are respectively arranged at two corners which are diagonal positions among the four corners of the optical sheet 16b. As described above, when the two through holes 16b1 and 16b2 are provided at diagonal positions, and when the optical sheet 16b is turned upside down from the state of FIG. 5, the arrangement of the two through holes 16b1 and 16b2 is as follows. Since it changes (because it changes from the upper right and lower left arrangement in FIG. 5 to the lower right and upper left arrangement), the front and back of the optical sheet 16b can be confirmed by confirming the shapes of the two through holes 16b1 and 16b2.

Further, as shown in FIG. 5, the shapes of the two through holes 16b1 and 16b2 when viewed in plan are different, one being substantially square and the other being substantially rhombus. If the shapes of the two through holes 16b1 and 16b2 are different from each other as described above, the shape of the two through holes 16b1 and 16b2 changes when the optical sheet 16b is turned upside down from the state shown in FIG. By confirming the shapes of 16b1 and 16b2, the vertical direction of the optical sheet 16b can be confirmed.

Subsequently, a method of attaching the penetrating member 32 to the chassis 14 in the manufacturing process of the backlight device 12 will be described. In the manufacturing process of the backlight device 12, first, a part of the reflection sheet 15, the diffusion plate 16 a, and the like so that the through holes 16 b 1, 16 a 1, and 15 a overlap with the fitting holes 14 c 1 provided in the receiving plate 14 c of the chassis 14. The optical sheet 16b is placed in order on the receiving plate 14c1. Thereafter, the penetrating member 32 is inserted into the through holes 16b1, 16a1, and 15a from the front side of the optical sheet 16b, and the tip of the penetrating member 32 is fitted into the fitting hole 14c1. Thereby, the penetrating member 32 can be attached to the chassis 14.

As described above, in the backlight device 12 according to the present embodiment, the plurality of penetrating members 32 that penetrate the diffusing plate 16a and the optical sheet 16b are fixed to the chassis 14 respectively, and thus the diffusing plate 16a and the optical sheet 16b. Is prevented by the penetrating member 32, so that a positional shift between the diffusion plate 16a and the optical sheet 16b can be effectively prevented or suppressed. Furthermore, since the two penetrating members 32 are arranged, the positional deviation between the diffusion plate 16a and the optical sheet 16b is effectively prevented or suppressed as compared with the configuration in which one penetrating member 32 is arranged. be able to. For this reason, it is possible to prevent or suppress the occurrence of optical defects in the backlight device 12. As a result, it is possible to prevent or suppress the occurrence of defects such as a decrease in luminance due to damage to the optical sheet 16b or the diffusion plate 16a.

Here, in a conventional configuration that suppresses vibration by sticking a double-sided tape between the diffuser plate and the reflective sheet and prevents a positional deviation between the optical sheet and the diffuser plate, the double-sided tape depends on the ambient temperature environment. The adhesive strength of the resin is reduced, and the vibration absorption effect is reduced. On the other hand, in the backlight device 12 according to the present embodiment, the structure of the penetrating member 32 and the like does not change depending on the ambient temperature environment, so that the positional deviation between the optical sheet 16b and the diffusion plate 16a is effective. Can be prevented or suppressed.

In addition, in a conventional configuration that suppresses vibration in the thickness direction of the optical sheet by attaching a spacer member to a portion of the frame that faces the optical sheet, and prevents the positional deviation between the optical sheet and the diffusion plate, Since the distance to the frame differs for each backlight device to be manufactured, the frame cannot be shared in the manufacturing process. On the other hand, in the backlight device 12 according to this embodiment, since a spacer member or the like is not attached to the frame 17, the frame 17 can be shared in the manufacturing process, and manufacturing efficiency can be improved.

Further, in the backlight device 12 according to the present embodiment, the optical sheet 16b has a quadrangular shape in plan view, and the two corners where the penetrating member 32 is a diagonal position among the four corners of the optical sheet 16b in plan view. Are arranged respectively. Thereby, since the distance between the two penetrating members 32 can be increased, compared with the case where the two penetrating members 32 are arranged close to each other, the distance between the diffusion plate 16a and the optical sheet 16b is increased. Misalignment can be prevented or suppressed more effectively.

Further, in the backlight device 12 according to the present embodiment, the through holes 16b1 and 16b2 are respectively provided at two positions through which the penetrating member 32 of the optical sheet 16b penetrates, and the two through holes 16b1 and 16b2 are opened in a plan view. Have different shapes. Thus, the top and bottom and front and back directions of the optical sheet 16b can be confirmed by the different shapes of the two through holes 16b1 and 16b2.

Further, in the backlight device 12 according to the present embodiment, the penetrating member 32 has a shaft portion 32a that penetrates the optical sheet 16b and the diffusion plate 16a, and a side opposite to the side of the penetrating member 32 that is fixed to the chassis 14. It is arranged at the end and has a warped portion 32b larger than the shaft portion 32a in plan view. Thereby, the warp portion 32b abuts on the optical sheet 16b, so that vibration in the thickness direction (Z-axis direction) of the optical sheet 16b and the diffusion plate 16a can be prevented or suppressed.

Further, in the backlight device 12 according to the present embodiment, the warped portion 32b of the penetrating member 32 has a folded portion 32b1 that is folded back to the optical sheet 16b side. As a result, the folded portion 32b1 folded to the optical sheet 16b side easily comes into contact with the optical sheet 16b, so that vibration in the thickness direction of the optical sheet 16b and the diffusion plate 16a can be further prevented or suppressed.

Further, in the backlight device 12 according to the present embodiment, the tip of the folded portion 32b1 on the optical sheet 16b side has a curved surface. For this reason, when the front-end | tip of the folding | turning part 32b1 contact | abuts with the optical sheet 16b, it can prevent thru | or suppress that the optical sheet 16b is damaged.

Further, the backlight device 12 according to the present embodiment further includes a frame 17 that covers the edge of the upper surface of the optical sheet 16b, and the warped portion 32b is disposed between the optical sheet 16b and the frame 17, The upper surface is parallel to the frame 17. As a result, when the upper surface of the warped portion 32 b comes into contact with the frame 17, the warped portion 32 b comes into contact with the frame 17, thereby preventing or suppressing the penetrating member 32 from rattling due to the warped portion 32 b coming into contact with the frame 17. it can.

Further, in the backlight device 12 according to the present embodiment, the fitting hole 14c1 is provided at a position where the penetrating member 32 of the chassis 14 is fixed, and the end of the penetrating member 32 on the chassis 14 side is the fitting hole 14c1. The chassis 14 is fixed by being fitted. Therefore, a specific configuration for fixing the penetrating member 32 to the chassis 14 is realized.

Further, in the backlight device 12 according to the present embodiment, the diffusion plate 16a has a plate shape, and the optical sheet 16b has a sheet shape smaller in thickness than the diffusion plate 16a. For this reason, it is possible to prevent or suppress the sheet-like optical sheet 16b from being damaged or the generation of powdered foreign substances due to the positional displacement between the diffusion plate 16a and the optical sheet 16b.

In the backlight device 12 according to the present embodiment, the chassis 14 includes a bottom plate 14a, a side plate 14b that rises from an edge of the bottom plate 14a, and a receiving plate 14c that extends outward from the tip of the side plate 14b. The diffusion plate 16a is a diffusion plate 16a that diffuses light from the cold cathode tube 18, and the optical sheet 16b is placed on the receiving plate 14c, and the penetrating member 32 is fixed to the receiving plate 14c. For this reason, in the direct-type backlight device 12, it is possible to prevent or suppress the positional deviation between the diffusion plate 16a and the optical sheet 16b.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. FIG. 6 is a cross-sectional view of the vicinity of a portion where the penetrating member 132 is arranged in the backlight device 112 according to the second embodiment, and shows a cross-sectional configuration of a cross section obtained by cutting the backlight device 112 along the Y-axis direction. ing. The second embodiment is different from the first embodiment in that an LED is used as a light source. Since the other configuration is the same as that of the first embodiment, description of the structure, operation, and effect is omitted. In FIG. 6, the part obtained by adding the numeral 100 to the reference sign in FIG. 4 is the same as the part described in the first embodiment.

In the backlight device 112 according to the second embodiment, an LED 118 is used as a light source instead of a cold cathode tube, as shown in FIG. Each LED 118 is mounted on an LED substrate 119 disposed on the surface of the bottom plate 114a. On the light emitting side of the LED 118 (the front side of the chassis 114), a diffusion plate 116a and an optical sheet 116b are arranged as in the first embodiment, and two penetrating members 132 penetrating a part of them are arranged. Yes. Thus, even in the direct type backlight device 112 in which the LED 118 is used as the light source, the positional deviation between the diffusion plate 116a and the optical sheet 116b is effectively prevented or suppressed by the two penetrating members 132. be able to. As a result, it is possible to prevent or suppress the occurrence of defects such as a decrease in luminance due to damage to the optical sheet 116b or the diffusion plate 116a.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. FIG. 7 is a cross-sectional view of the vicinity of a portion where the penetrating member 232 is disposed in the backlight device 212 according to the third embodiment, and shows a cross-sectional configuration of a cross section of the backlight device 212 cut along the Y-axis direction. ing. The third embodiment is different from the second embodiment in that the configuration of the backlight device is not a direct type but an edge light type. Since the other configuration is the same as that of the first embodiment, description of the structure, operation, and effect is omitted. In FIG. 7, a part obtained by adding the numeral 200 to the reference numeral in FIG. 4 is the same as the part described in the first embodiment.

In the backlight device 212 according to the third embodiment, a pair of LEDs 218 are arranged on the side plates 214b of the chassis 214 via the LED substrates 219, respectively, and the light from the LEDs 218 is guided between the pair of LEDs 218 in the chassis 214. A light guide plate 216a is disposed. The light guide plate 216a has a light incident surface 216a2 on the side facing the LED 218, and a light exit surface 216a3 on the front side. That is, the backlight device 212 is an edge light type backlight device 212 in which the light source is the LED 218. In the backlight device 212, two penetrating members 232 penetrating a part of the light guide plate 216a and the optical sheet 216b are disposed. As described above, even in the edge-light type backlight device 212, the positional deviation between the diffusion plate 216a and the optical sheet 216b can be effectively prevented or suppressed by the two penetrating members 232. As a result, it is possible to prevent or suppress the occurrence of defects such as a decrease in luminance due to damage to the optical sheet 216b or the diffusion plate 216a.

The correspondence between the configuration of each embodiment and the configuration of the present invention is described. The

diffusion plates

16a and 116a and the light guide plate 216a are examples of the “first optical member”. The

optical sheets

16b, 116b, and 216b are examples of the “second optical member”. The

chassis

14, 114, and 214 are examples of “accommodating members”. The

backlight devices

12, 112, and 212 are examples of “illumination devices”. The

frames

17, 117, and 217 are examples of “frame members”. The receiving

plates

14c and 114c are an example of “extending portions”. The liquid crystal display device 10 is an example of a “display device”.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, a configuration in which a diffusion plate or a light guide plate is disposed as the first optical member and an optical sheet is disposed as the second optical member is illustrated. However, the first optical member and the first optical member The configuration of the optical member 2 is not limited.

(2) In each of the above-described embodiments, the configuration in which two penetrating members are arranged is illustrated. However, a plurality of penetrating members may be arranged, and three or more penetrating members are arranged. May be.

(3) In each of the above embodiments, the configuration in which the two penetrating members are arranged diagonally is illustrated, but the arrangement of the penetrating members is not limited.

(4) In each of the above embodiments, the configuration in which the shape of the through hole is a substantially square shape and a substantially rhombus shape in plan view is illustrated, but the shape of the through hole is not limited.

(5) In addition to the above embodiments, the configuration of the first optical member, the second optical member, the configuration of the through member, the shape of the through hole, and the like can be changed as appropriate.

(6) In each of the above embodiments, a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention can also be applied to display devices using other types of display panels.

(7) In each of the above embodiments, a television receiver provided with a tuner has been exemplified. However, the present invention can also be applied to a display device that does not include a tuner.

As mentioned above, although each embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

Further, the technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

TV: TV receiver, Ca, Cb: cabinet, T: tuner, S: stand, 10: liquid crystal display device, 11: liquid crystal panel, 12, 112, 212: backlight device, 13: bezel, 14, 114, 214 : Chassis, 14c1, 114c1, 214a1: Fitting hole, 16a, 116a: Diffuser plate, 16b, 116b, 216b: Optical sheet, 16b1, 16a1, 15a, 116b1, 116a1, 115a, 216b1, 216a1, 215a: Through hole, 17, 117, 217: frame, 18: cold cathode tube, 19: lamp holder, 20, 30: glass substrate, 22: polarizing plate, 32, 132, 232: penetrating member, 32a, 132a, 232a: shaft portion,

32b

132b, 232b: warped portion, 32b1, 132b1, 232b1: folded , 118,218: LED, 119,219: LED board, 216a: light guide plate

Claims

A light source;
A first optical member having a light incident surface on which light from the light source enters; and a light output surface from which light incident from the light incident surface exits;
A second optical member disposed on the light exit surface of the first optical member;
A housing member for housing at least the light source;
A plurality of penetrating members that pass through the second optical member and the first optical member and are fixed to the housing member;
A lighting device comprising:
The second optical member has a square shape in plan view,
2. The lighting device according to claim 1, wherein the penetrating member is disposed at each of two corners that are diagonal positions among the four corners of the second optical member in a plan view.
A through hole is provided in each of two positions through which the penetrating member of the second optical member passes,
The lighting device according to claim 2, wherein the openings of the two through holes have different shapes in plan view.
The penetrating member is disposed at a shaft portion penetrating the second optical member and the optical member, and an end portion of the penetrating member on the opposite side to the side fixed to the housing member. The lighting device according to claim 2, further comprising a warped portion larger than the shaft portion.
The lighting device according to claim 4, wherein the warped part of the penetrating member has a folded part folded back to the second optical member side.
The lighting device according to claim 5, wherein a tip of the folded portion on the second optical member side has a curved surface.
A frame-like member that covers an edge of the upper surface of the second optical member;
7. The warped portion is disposed between the second optical member and the frame-shaped member, and an upper surface thereof is parallel to the frame-shaped member. The illumination device according to any one of the above.
A fitting hole is provided at a position where the penetrating member of the housing member is fixed,
The said penetration member is being fixed to the said accommodating member by the edge part by the side of the said accommodating member being fitted by the said fitting hole, The any one of Claims 1-7 characterized by the above-mentioned. The lighting device described.
The first optical member is plate-shaped,
The lighting device according to any one of claims 1 to 8, wherein the second optical member is formed in a sheet shape having a thickness smaller than that of the first optical member.
The housing member includes a bottom plate, a side plate rising from an edge of the bottom plate, and an extending portion extending outward from a tip of the side plate,
The first optical member is a diffusing plate that diffuses light from the light source, and is placed on the extending portion,
The second optical member is an optical sheet;
The lighting device according to claim 9, wherein the penetrating member is fixed to the extending portion.
The first optical member is a light guide plate that guides light from the light source, the light incident surface is provided on a side surface thereof, and the light exit surface is provided on one plate surface thereof,
The second optical member is an optical sheet;
A reflection sheet is disposed on the plate surface side opposite to the light exit surface of the first optical member;
The lighting device according to claim 9, wherein the penetrating member penetrates the reflection sheet.
A display device comprising a display panel that performs display using light from the illumination device according to any one of claims 1 to 11.
The display device according to claim 12, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to claim 12 or 13.