WO2017126034A1

WO2017126034A1 - Light source device and display apparatus

Info

Publication number: WO2017126034A1
Application number: PCT/JP2016/051448
Authority: WO
Inventors: 佳威中村
Original assignee: 堺ディスプレイプロダクト株式会社
Priority date: 2016-01-19
Filing date: 2016-01-19
Publication date: 2017-07-27

Abstract

Provided are a light source device that prevents a light source from being misaligned, and a display apparatus provided with the light source device. This light source device is provided with; a light guide plate; a hollow support member that is a rod-like body and has an opening along a longitudinal direction fitted to the edge part of the light guide plate; and a light source fixed to the inner wall of the support member. This display apparatus is provided with: the light source device; and a display panel arranged opposingly to the light guide plate of the light source device, and is configured such that light emitted from the light guide plate is applied to the back surface of the display panel, and an image is displayed on the front surface of the display panel.

Description

Light source device and display device

The present invention relates to, for example, a light source device used as a backlight for irradiating light to a liquid crystal panel (display panel), and a display device including the light source device.

A display device including a liquid crystal panel as an image display unit includes a backlight device (light source device) on the back side of the liquid crystal panel, and modulates and transmits light emitted from the light source device by the liquid crystal panel. It is configured to display an image. Backlight devices are roughly classified into direct type and edge light type, but in recent years, edge light type backlight devices are widely used from the viewpoint of reducing power consumption and thinning.

The edge-light type backlight device includes a light guide plate and a light source housed in a shallow box-type backlight chassis that is open on one side. The light guide plate is a translucent resin plate and is placed on the bottom plate of the backlight chassis. For example, the light source is opposed to one side edge of the light guide plate. The peripheral edge of the light guide plate is covered over an appropriate width by a frame body fitted from the open side to the edge of the backlight chassis. The light travels while diffusing inside the optical plate, and is distributed and emitted over the entire surface of the light guide plate exposed inside the frame.

In the backlight device disclosed in Patent Document 1, a support member that supports a plate-like light source is disposed on a side plate of a backlight chassis, and an extending portion that extends from one edge of the support member to the outside of the side plate is provided. The support member is fixed by being sandwiched between one edge of the side plate and the back surface of the frame.

Japanese Patent Laid-Open No. 2015-95298

However, in the backlight device of Patent Document 1, when there are slight warpage or variations in the finish of components such as the backlight chassis or the frame, the position of the light source is shifted, causing a decrease in brightness and unevenness of emitted light. There was a problem.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light source device and a display device that prevent positional deviation of the light source.

A light source device according to an aspect of the present invention is a light guide plate and a rod-like body, and is fixed to a hollow support member in which an opening along the longitudinal direction is fitted to an edge of the light guide plate, and an inner wall of the support member. And a light source.

A display device according to another aspect of the present invention includes the light source device described above and a display panel disposed to face the light guide plate of the light source device, and emits light from the light guide plate on the back surface of the display panel. Irradiated and configured to display an image in front of the display panel.

According to the present invention, it is possible to prevent the positional deviation of the light source in the light source device and the display device.

1 is a perspective view schematically showing the appearance of a display device according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is a perspective view which shows a supporting member. 6 is a cross-sectional view of a display device according to Embodiment 2. FIG. FIG. 10 is a cross-sectional view of a display device according to Embodiment 3. FIG. 6 is a transverse cross-sectional view of a display device according to Embodiment 4.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof. In the following description, the top, bottom, left and right in each figure are used.

Embodiment 1
FIG. 1 is a perspective view schematically showing the appearance of the display device according to the first embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. The illustrated display device includes a liquid crystal panel (display panel) 1 for image display having a rectangular plate shape, and a backlight (light source device) 2 for irradiating the liquid crystal panel 1 with light.

The periphery of the liquid crystal panel 1 is covered from the front side so as to be bordered over a suitable width by a rectangular frame-shaped front cabinet 10. FIG. 1 shows only the image display surface of the liquid crystal panel 1 exposed in the frame of the front cabinet 10. The back side of the liquid crystal panel 1 is covered with a backlight chassis (housing) 20 that constitutes the outer casing of the backlight 2.

The display device further includes a stand 13, which is supported on an appropriate mounting surface via the stand 13, and is used while maintaining the image display surface of the liquid crystal panel 1 in a vertical position as shown in FIG. .

As shown in FIG. 2, the backlight 2 includes a backlight chassis 20, a light source 21, a light guide plate 22, and a support member 23. The backlight chassis 20 is formed into a shallow box with one side open. The optical sheet 11 is placed on the first surface of the light guide plate 22 (the surface facing the liquid crystal panel 1). The second surface (surface opposite to the first surface) of the light guide plate 22 is covered with a reflection sheet 24 having light reflectivity. The light guide plate 22 is a translucent resin plate and has a rectangular shape smaller than the backlight chassis 20. For example, the light guide plate 22 is disposed opposite to the bottom plate of the backlight chassis 20 by the support member 23. One short side or both short sides, or one long side or both long sides of the light guide plate 22 are assembled to a support member 23 that supports the light source 21. In the present embodiment, the light guide plate 22 has one short side edge assembled to the support member 23.

FIG. 3 is a perspective view showing the support member 23. The support member 23 is a rod-shaped body having a U-shaped cross section, and has an opening 234 along the longitudinal direction on one side. The support member 23 includes a bottom portion 231, and

side wall portions

232 and 233 extending in a direction orthogonal to the bottom portion 231 at both edges of the bottom portion 231. The opening 234 includes an edge 2321 (first edge) on the side far from the bottom 231 in the side wall 232 (first side wall) and a side far from the bottom 231 in the side wall 233 (second side wall). It is formed by the edge 2331 (second edge). The inner wall of the support member 23, that is, the inner walls (inner surfaces) of the bottom 231 and the

side walls

232 and 233 are flat, and all or a part thereof has light reflectivity.

The light source 21 includes an elongated rectangular substrate 210 and a plurality of (only three are shown in FIG. 3) light emitting units 211 arranged in parallel along the longitudinal direction on the substrate 210. The light emitting unit 211 is provided with an emitting unit 212 on the opposite side of the surface to be attached to the substrate 210. The light emitting unit 211 is configured by a resin-molded LED (Light Emitting Diode). The emission unit 212 is made of a transparent resin or the like, and the light emitting unit 211 emits light from the emission unit 212.

The light source 21 is assembled to the support member 23 by fixing the bottom surface of the substrate 210 to the inner wall of the bottom portion 231 with, for example, screws or double-sided tape. For example, the length A of the short side of the substrate 210 is configured to coincide with the opposing width B of the

side wall portions

232 and 233, and the light source 21 is inserted into the substrate 210 by fitting the substrate 210 between the

side wall portions

232 and 233. It may be positioned in the surface direction. The short side length A of the substrate 210 may be shorter than the opposing width B of the

side walls

232 and 233. The light source 21 may be a light source other than an LED, such as CCFL (Cold Cathode Fluorescent Lamp).

Hereinafter, the assembly method of the backlight 2 will be described. One side edge of the light guide plate 22 is opposed to the emitting portion 212 with a predetermined interval, and the one side edge portion of the light guide plate 22 is fitted into the opening 234 of the support member 23. Both end surfaces of the light guide plate 22 in the longitudinal direction are fixed to the side plates of the backlight chassis 20.

In the backlight 2 configured as described above, the light emitted from the light source 21 is reflected by the inner wall of the

side wall

232 or 233 and is incident on one side edge of the light guide plate 22. Light incident from one side edge of the light guide plate 22 is emitted from the first surface of the light guide plate 22.

A display device is configured by placing the optical sheet 11 on the light guide plate 22 in the backlight 2 configured as described above, and sandwiching the liquid crystal panel 1 between the front cabinet 10 and the support member 23.

In the present embodiment, both end surfaces of the light guide plate 22 in the longitudinal direction are fixed to the side plates of the backlight chassis 20, but both ends of the support member 23 in the longitudinal direction may be fixed to the side plates of the backlight chassis 20. In addition, these fixation is performed using a screw or a double-sided tape, for example.

According to the present embodiment, the light source 21 is fixed to the inner wall of the bottom portion 231, and the light guide plate 22 is fitted to the support member 23. That is, the light guide plate 22 and the light source 21 are integrally fixed via the support member 23. As a result, even if the backlight chassis 20 is warped or has variations in finish, or even if the backlight chassis 20 is deformed, the positional relationship between the light guide plate 22 and the light source 21 is kept constant. 21 can be prevented from being displaced with respect to the light guide plate 22.

Embodiment 2
FIG. 4 is a cross-sectional view of the display device according to the second embodiment. In the following, the configuration and operation other than those specifically described are the same as those of the first embodiment, and the description is omitted for the sake of brevity. In the second embodiment, in the light source 21, the bottom surface of the substrate 210 is fixed to the inner wall of the side wall portion 233 while one side surface of the substrate 210 is in contact with the inner wall of the bottom portion 231. The light emitting unit 211 is a side view type LED provided such that the emitting unit 212 faces the opening 234 of the support member 23, and emits light in parallel with the substrate 210. The light source 21 is inserted between the side wall portion 232 and the side wall portion 233 with one long side of the substrate 210 facing the inner wall of the bottom portion 231, and the substrate 210 is fixed to the inner wall of the side wall portion 233.

In this embodiment, the bottom surface of the substrate 210 is fixed to the inner wall of the side wall portion 233, but the bottom surface of the substrate 210 may be fixed to the inner wall of the side wall portion 232.

According to the present embodiment, even when a side-view type LED is used, the light guide plate 22 and the light source 21 are integrally fixed via the support member 23, so that the positional deviation of the light source 21 with respect to the light guide plate 22 can be prevented. .

Embodiment 3
FIG. 5 is a cross-sectional view of the display device according to the third embodiment. In the following, the configuration and operation other than those specifically described are the same as those of the first embodiment, and the description is omitted for the sake of brevity.
The display device according to Embodiment 3 is configured such that the distance between the two

side wall portions

232 and 233 is larger than the distance between the two

edge portions

2321 and 2331. Specifically, the edge 2321 has a protruding portion 235 (first protruding portion) that protrudes toward the side wall portion 233. In addition, the edge portion 2331 has a protruding portion 236 (second protruding portion) that protrudes toward the side wall portion 232. In this case, the opening 234 is formed by the two protruding

portions

235 and 236, and the distance between the two

edge portions

2321 and 2331 is the distance between the two protruding

portions

235 and 236. The light guide plate 22 is fixed to the support member 23 by sandwiching one side edge portion thereof by the projecting

portions

235 and 236.

According to this embodiment, in addition to preventing the positional deviation of the light source 21, the following effects can be obtained. That is, since the internal space of the support member 23 is larger than that of the first embodiment, the light emitted from the light source 21 is mixed well in the support member 23 and then enters the light guide plate 22. Therefore, the amount of light incident on the light guide plate 22 becomes uniform, and unevenness of the light emitted from the light guide plate 22 can be suppressed.

Embodiment 4
FIG. 6 is a cross-sectional view of the display device according to the fourth embodiment. In the following, the configuration and operation other than those specifically described are the same as those of the first embodiment, and the description is omitted for the sake of brevity. The cross-sectional shape of the support member 23 is an L shape having an opening 234 at one end. The support member 23 includes a recess 237 in which the bottom 231 side of the side wall 232 is recessed in the front direction (the liquid crystal panel 1 side). The concave portion 237 is opposed to the side wall portion 233 and includes a bottom portion (end portion) 238 having one end portion connected to the bottom portion 231, and a connecting portion 239 connecting the other end portion of the bottom portion 238 and the side wall portion 232. The substrate 210 is fixed to the inner wall of the bottom 238 with, for example, screws or double-sided tape. For example, the length of the short side of the substrate 210 is configured to coincide with the opposing width of the connecting portion 239 and the bottom portion 231, and the light source 21 is mounted on the substrate 210 by fitting the substrate 210 between the connecting portion 239 and the bottom portion 231. It may be positioned in the surface direction of 210. Note that the length of the short side of the substrate 210 may be shorter than the opposing width of the connecting portion 239 and the bottom portion 231. The light emitting unit 211 is provided so that the emitting unit 212 faces the side wall 233.

In addition, the recessed part 237 may be provided in the side wall part 233 side.

It should be considered that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined not by the above-described meaning but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

For example, in the embodiment, the inner wall of the support member 23 (the inner wall of the bottom portion 231 and the side wall portions 232 and 233) is flat. It may have a shape, for example, a curved shape. For example, when the light source 21 is disposed on the bottom 231, the side walls 232 and / or 233 move from the edge 2321 and / or 2331 on the opening 234 side and the edge on the bottom 231 side toward the center. It may have a curved shape that gradually protrudes to the outside of the support member 23. By making the side wall portions 232 and / or 233 have such a curved shape, the maximum value of the distance between the two

side wall portions

232 and 233 becomes larger than the distance between the two

edge portions

2321 and 2331, and the support member 23. The space inside can be made larger. Therefore, the same effect as in the third and fourth embodiments can be obtained.

1 Liquid crystal panel (display panel)
2 Light source device (backlight)
21 light source 210 substrate 211 light emitting part 22 light guide plate 23 support member 231 bottom part 232 side wall part (first side wall part)
233 side wall (second side wall)
2321 Edge (first edge)
2331 edge (second edge)
234 Opening 235 Projecting part (first projecting part)
236 Projecting part (second projecting part)
237 Recess 238 Bottom (end)

Claims

A light guide plate;
A hollow support member that is a rod-like body and has an opening along the longitudinal direction fitted to an edge of the light guide plate;
A light source fixed to the inner wall of the support member.
The light source device according to claim 1, wherein all or part of the inner wall of the support member has light reflectivity.
The support member includes a bottom portion and two side wall portions extending from both edges along the longitudinal direction of the bottom portion,
The opening includes a first edge of the first sidewall of the two sidewalls far from the bottom and a side of the second sidewall of the two sidewalls far from the bottom. The light source device according to claim 1, wherein the light source device is formed by the second edge portion.
The light source device according to claim 3, wherein a maximum value of a distance between the two side wall portions is larger than a distance between the first edge portion and the second edge portion.
The first edge portion has a first projecting portion projecting toward the second side wall portion side,
The second edge has a second projecting portion projecting toward the first side wall,
The light source device according to claim 4, wherein the opening is formed by the first projecting portion and the second projecting portion.
6. The light source device according to claim 4, wherein at least one of the two side wall portions has a curved shape such that a part thereof protrudes to the outside of the support member.
The cross-sectional shape of the support member is an L-shape having the opening at one end,
The light source device according to any one of claims 1 to 6, wherein the light source is fixed to the other end of the support member.
A light source device according to any one of claims 1 to 7,
A display panel disposed opposite to the light guide plate of the light source device,
A display device configured to irradiate light emitted from the light guide plate to a back surface of the display panel and display an image on a front surface of the display panel.