WO2020059019A1

WO2020059019A1 - Backlight apparatus

Info

Publication number: WO2020059019A1
Application number: PCT/JP2018/034467
Authority: WO
Inventors: 東　洋喜; 誉志生又賀; 直貴細谷; 理彩池田
Original assignee: 堺ディスプレイプロダクト株式会社
Priority date: 2018-09-18
Filing date: 2018-09-18
Publication date: 2020-03-26

Abstract

This backlight apparatus is provided with a backlight chassis provided with a bottom part and a side wall, and a panel chassis provided with a plurality of chassis members, each of the plurality of chassis members being provided with a plate-shaped part and a retaining part, the plate-shaped part having a projection protruding from the outer surface of the plate-shaped part, the side wall having a guide groove in which the projection is guided, the guide groove being open in the upper end of the side wall and having an introduction part for introducing the projection into the guide groove, a first guide part for guiding the projection so that the projection approaches the bottom part from the introduction part, and a second guide part which is continuous with the first guide part and guides the projection in the longitudinal direction of the side wall, and the second guide part having a contacting part for coming in contact with the projection and restricting movement of at least one chassis member when the at least one chassis member should happen to move away from the bottom part.

Description

Backlight device

<< The present invention relates to a backlight device.

The liquid crystal display device includes, for example, a liquid crystal panel, a bezel, a backlight chassis, an LED substrate, a panel chassis, a light guide plate, a reflection sheet, and an optical sheet laminate as described in Patent Document 1. In the liquid crystal display device of Patent Document 1, a liquid crystal panel, an optical sheet laminate, a light guide plate, and a reflection sheet are stacked and housed in this order from the front side in a backlight chassis. An LED substrate is arranged on the inner surface of the long side portion of the backlight chassis, and faces the end surface of the long side portion of the light guide plate.

In the liquid crystal display device having such a structure, the panel chassis is disposed between the inner surface of the backlight chassis and the end surface of the light guide plate in a state where the light guide plate, the LED board, and the like are housed in the backlight chassis. The outer surface of the panel chassis is in contact with the inner surface of the backlight chassis, and the flat portion extending inside the panel chassis presses the front surface of the light guide plate. When assembling the liquid crystal display device, a liquid crystal panel and the like are further attached to the backlight device in which the panel chassis is attached to the backlight chassis, and the bezel is engaged with the backlight chassis.

International Publication No. WO 2016/194226 JP 2008-52240A

However, in the liquid crystal display device of Patent Literature 1, the panel chassis is merely placed on the backlight chassis until the bezel is engaged with the backlight chassis. Therefore, for example, when the backlight device is transported to a place where another process for attaching another member such as a liquid crystal panel is performed, the panel chassis may be detached from the backlight chassis due to vibration during transport. is there. In this case, since the light guide plate cannot be pressed by the panel chassis, there is a possibility that the light guide plate may be damaged by vibration during transport.

On the other hand, there is also a structure in which an engaging claw that elastically deforms is provided on the panel chassis, and the engaging claw is engaged with the backlight chassis to prevent the panel chassis from being detached from the backlight chassis ( For example, see Patent Document 2).

However, in recent years, with the thinning and narrowing of the bezel of the liquid crystal display device, it is becoming difficult to fix the panel chassis and the backlight chassis using the engagement claws that elastically deform. Specifically, when the thickness of the liquid crystal display device is reduced, the lengths of the panel chassis and the backlight chassis are reduced in the thickness direction of the liquid crystal display device. For this reason, it is not possible to secure a sufficient length from the fulcrum of the elastically deformable engaging claw to the tip of the claw. In this case, a large force is required to elastically deform the engaging claw, and the engaging claw is also easily damaged. Further, as the liquid crystal display device becomes narrower in bezel, the gap between the inner surface of the backlight chassis and the end surface of the light guide plate becomes narrower. When the tip of the engaging claw is bent toward the light guide plate when the engaging claw is elastically deformed and bent, a space where the tip of the engaging claw is bent is required in addition to the thickness of the panel chassis. Become. Therefore, when the space between the inner surface of the backlight chassis and the end surface of the light guide plate is narrowed due to the narrow bezel, it is difficult to arrange the panel chassis in the narrow space when the panel chassis has the engagement claws. .

Therefore, in view of such a problem, the present invention is applicable to a liquid crystal display device having a thinner and narrower bezel, and an object of the present invention is to provide a backlight device that suppresses separation of a panel chassis from a backlight chassis.

A backlight device according to an embodiment of the present invention includes a light source, a front surface and a back surface, a light guide plate that emits light incident from the light source from the front surface, and a back surface of the light guide plate. A backlight chassis including an opposing bottom portion, and a side wall extending from the bottom portion, accommodating the light source and the light guide plate, and being disposed between an inner surface of the side wall of the backlight chassis and an end surface of the light guide plate. A plurality of chassis members, and a frame-shaped panel chassis configured to press a front surface of the light guide plate; and each of the plurality of chassis members is provided on an inner surface of the side wall of the backlight chassis. A plate-like portion extending along the outer periphery of the light guide plate, and a holding portion extending inward from the plate-like portion so as to face a peripheral edge of the front surface of the light guide plate. At least one plate member of the chassis member has a protrusion protruding from an outer surface of the plate member facing an inner surface of the side wall, and the side wall of the backlight chassis has a guide groove through which the protrusion is guided. A guide portion that opens at an upper end of the side wall, and introduces the protrusion into the guide groove; and a first guide portion that guides the protrusion from the introduction portion to approach the bottom. A second guide portion which is continuous with the first guide portion and guides the protrusion in a longitudinal direction of the side wall, wherein the second guide portion moves in a direction in which the at least one chassis member moves away from the bottom portion. And a contact portion for contacting the projection and restricting the movement of the at least one chassis member when trying to move.

A backlight device according to another embodiment of the present invention includes a light source, a light guide plate having a front surface and a back surface, and a light guide plate that emits light incident from the light source from the front surface, and the light guide plate. A bottom portion facing the back surface of the light guide plate, and a backlight chassis accommodating the light source and the light guide plate, and a side wall extending from the bottom portion, between an inner surface of the side wall of the backlight chassis and an end surface of the light guide plate. A frame-shaped panel chassis configured to hold a front surface of the light guide plate, wherein each of the plurality of chassis members includes the side wall of the backlight chassis. A plate-shaped portion extending along an inner surface of the light guide plate, and a holding portion extending inward from the plate-shaped portion so as to face a peripheral portion of a front surface of the light guide plate, wherein the side wall includes Shape The plate-like portion of at least one chassis member, which has a protrusion protruding from the inner surface of the side wall facing the outer surface and faces the inner surface of the side wall having the protrusion, of the plurality of chassis members, the protrusion is guided. A guide groove, wherein the guide groove is open at a lower end of the plate-like portion, and an introduction portion for introducing the protrusion into the guide groove, and the protrusion is provided from the introduction portion to an upper end of the plate-like portion. A first guide portion that guides the user to approach, and a second guide portion that is continuous with the first guide portion and guides the protrusion in a longitudinal direction of the plate-shaped portion; When the at least one chassis member moves in a direction away from the bottom portion, the at least one chassis member has an abutting portion that abuts on the protrusion to regulate the movement of the at least one chassis member.

According to the backlight device of the present invention, the present invention is applicable to a liquid crystal display device having a thinner and narrower bezel, and can prevent the panel chassis from being detached from the backlight chassis.

1 is a schematic exploded perspective view showing a liquid crystal display device including a backlight device according to an embodiment of the present invention. FIG. 2 is a front view of the liquid crystal display device of FIG. 1 after assembly. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a perspective view of the chassis member used for the backlight device of one embodiment of the present invention. It is a perspective view showing the state where the chassis member was attached to the backlight chassis. It is the schematic which shows the state in which the protrusion provided in the chassis member was guided by the guide groove provided in the backlight chassis. It is a figure which shows the modification of a guide groove. It is a figure which shows the other modification of a guide groove. It is the schematic which shows the state which the plate-shaped part of a chassis member is inserted between the inner surface of the side wall of a backlight chassis, and the end surface of a light-guide plate. FIG. 5 is a diagram illustrating an engaging portion provided on the backlight chassis and engaging with an end of a chassis member. It is the schematic which shows the engagement part provided in the 2nd guide part. It is the schematic which shows the modification of the engagement part provided in the 2nd guide part. FIG. 9 is a schematic perspective view illustrating a backlight device according to a second embodiment of the present invention. FIG. 13 is a schematic diagram showing a state before a spacer member is inserted between a pair of chassis elements in the backlight device according to the second embodiment of the present invention. FIG. 13 is a schematic diagram showing a state in which a side edge of a spacer member is in contact with a pair of chassis elements in the backlight device according to the second embodiment of the present invention. FIG. 13 is a schematic diagram showing a state where a spacer member is inserted between a pair of chassis elements in the backlight device according to the second embodiment of the present invention. FIG. 14 is a diagram illustrating a modified example of the spacer member in the backlight device according to the second embodiment of the present invention. FIG. 13 is a schematic diagram showing a state before a chassis member is attached to a backlight chassis in the backlight device according to the third embodiment of the present invention. FIG. 13 is a schematic diagram showing a state in which a projection provided on a side wall of a backlight chassis is inserted into a first guide portion of a guide groove of a chassis member in the backlight device according to Embodiment 3 of the present invention. FIG. 14 is a schematic diagram showing a state where a projection provided on a side wall of a backlight chassis is located at an end of a second guide portion of a guide groove of a chassis member in the backlight device according to the third embodiment of the present invention. In the backlight device according to the third embodiment of the present invention, it is a schematic diagram showing a state where a plate-shaped portion of a chassis member is inserted between an inner surface of a side wall of a backlight chassis and an end surface of a light guide plate.

[Embodiment 1]
Hereinafter, a backlight device according to an embodiment of the present invention will be described with reference to the drawings. Note that the backlight device of the present invention is not limited to the following embodiments.

FIG. 1 is a schematic exploded perspective view of a liquid crystal display device D including a backlight device 1 according to an embodiment of the present invention, FIG. 2 is a front view of the liquid crystal display device, and FIG. FIG. 3 is a sectional view taken along line III-III. In the present embodiment, the liquid crystal display device D includes a bezel B, a liquid crystal panel P, and a backlight device 1, as shown in FIG. The backlight device 1 includes a light source 2, a reflection plate 3, a light guide plate 4, a backlight chassis 5, and a panel chassis 6.

In this specification, the direction in which the image of the liquid crystal display device D is displayed is referred to as the front, the direction opposite to the direction in which the image is displayed is referred to as the rear, and both the front and the rear are referred to as the front-back direction. The front surface of each component of the liquid crystal display device D or the backlight device 1 is called a front surface, and the surface opposite to the front surface is called a back surface. Further, for each component of the liquid crystal display device D or the backlight device 1, a direction approaching the center of the front surface or the back surface is called an inside, and a direction opposite to the inside is called an outside.

The bezel B is a substantially rectangular member located on the front surface of the liquid crystal display device D. As shown in FIG. 1, the bezel B extends parallel to the front surface of the liquid crystal panel P, and covers a peripheral portion of the front surface of the liquid crystal panel P. And a side wall portion Bb extending from the outer periphery of Ba to the rear of the liquid crystal display device D perpendicularly to the frame portion Ba. A rectangular opening is formed inside the frame portion Ba of the bezel B, and an image displayed in the display area of the liquid crystal panel P is displayed through the space. The bezel B is locked to the backlight chassis 5 by, for example, a locking claw not shown.

The liquid crystal panel P is a rectangular panel for displaying an image. The liquid crystal panel P is arranged behind the frame Ba of the bezel B and in front of an optical sheet (not shown). The liquid crystal panel P has a front surface on which an image is displayed and a back surface opposite to the front surface. The front surface of the liquid crystal panel P faces the back surface of the frame portion Ba of the bezel B, and the back surface of the liquid crystal panel P faces the front surface of the optical sheet.

Although not shown, the liquid crystal panel P has, for example, a TFT substrate, a counter substrate facing the TFT substrate, and a liquid crystal layer provided between the TFT substrate and the counter substrate. Note that the structure of the liquid crystal panel P is not particularly limited as long as an image can be displayed, and may have the same structure as a known liquid crystal panel.

(4) The optical sheet diffuses and condenses light emitted from the light source 2 of the backlight device 1 toward the optical sheet, and irradiates the liquid crystal panel P with uniform light. The optical sheet is rectangular and has a front surface facing the back surface of the liquid crystal panel P and a back surface opposite to the front surface. In the present embodiment, light emitted from the light source 2 of the backlight device 1 via the light guide plate 4 is incident on the back surface of the optical sheet. Light incident from the back surface of the optical sheet is diffused and condensed by the optical sheet, and is emitted from the front surface of the optical sheet toward the back surface of the liquid crystal panel P with a uniform luminance distribution. Note that a known optical sheet having the above-described function can be used as the optical sheet.

The backlight device 1 irradiates light from the light source 2 toward the back surface of the liquid crystal panel P in order to display an image on the liquid crystal panel P. The backlight device 1 may be an edge light type backlight or a direct type backlight. In the present embodiment, as shown in FIG. 1, the backlight device 1 is of an edge light type, and includes a light source 2, a reflection plate 3, a light guide plate 4, and a backlight chassis 5.

In the present embodiment, the light source 2 is provided along the long side of the light guide plate 4 and irradiates the end face of the light guide plate 4 with light. As the light source 2, for example, a light source in which a plurality of LEDs are arranged at intervals on a substrate can be used. Note that the light source 2 is not limited to the LED light source, and another light source such as a fluorescent tube may be used. In the present embodiment, the light source 2 is provided along the long side below the light guide plate 4, but the light source 2 is provided at the long side above the light guide plate 4 or the short side of the light guide plate 4. It may be provided along the side.

The light guide plate 4 has a front surface and a back surface, and emits light incident from the light source 2 from the front surface. The light guide plate 4 is formed in a rectangular flat plate shape. In the present embodiment, the light guide plate 4 diffuses the light incident on the end face of the light guide plate 4 from the light source 2 inside, and emits the diffused light from the front surface to the liquid crystal panel.

The reflection plate 3 is disposed between the bottom 51 of the backlight chassis 5 and the back surface of the light guide plate 4. The reflecting plate 3 reflects light traveling toward the back surface of the light guide plate 4 toward the front surface. The reflection plate 3 is formed of, for example, a synthetic resin having a high reflectance.

As shown in FIGS. 1 and 3, the backlight chassis 5 is a box body having an opening at the front, having a bottom part 51 facing the back surface of the light guide plate 4 and a side wall 52 extending from the bottom part 51. Specifically, as shown in FIG. 1, the backlight chassis 5 includes a substantially rectangular plate-shaped bottom 51, a first side wall 52 a, a second side wall 52 b, and a third side extending substantially perpendicular to the bottom 51. A side wall 52c and a fourth side wall 52d (hereinafter, simply referred to as a side wall 52) are provided. The side wall 52 is arranged in a rectangular frame shape. Note that the shape of the backlight chassis 5 may be other than a substantially rectangular shape, and the number of side walls may be other than four. Further, in the present embodiment, the side wall 52 is provided continuously along one side of the backlight chassis 5, but the side wall 52 may be interrupted in the longitudinal direction along one side of the backlight chassis 5.

The backlight chassis 5 accommodates the light source 2 and the light guide plate 4 in a space defined by the bottom 51 and the side walls 52. In the present embodiment, as shown in FIG. 3, the backlight chassis 5 has the reflector 3 and the light guide plate 4 disposed substantially parallel to the bottom 51, and the end surface 41 of the light guide plate 4 is formed by the inner surface 521 of the side wall 52. Are separated from each other at a predetermined interval.

As shown in FIG. 1, the panel chassis 6 includes a plurality of

chassis members

6a, 6b, 6c, and 6d, and is formed in a frame shape by the plurality of chassis members 6a to 6d. The plurality of chassis members 6 a to 6 d are arranged between the inner surface 521 of the side wall 52 of the backlight chassis 5 and the end surface 41 of the light guide plate 4. The panel chassis 6 is disposed between the inner surface 521 of the side wall 52 of the backlight chassis 5 and the end surface 41 of the light guide plate 4 and attached to the side wall 52 of the backlight chassis 5. The panel chassis 6 is configured to press the front surface of the light guide plate 4. In the present embodiment, each of the plurality of chassis members 6a to 6d is an elongated member extending in the longitudinal direction of the opposing side walls 52a to 52d.

In the present embodiment, as shown in FIG. 1, the panel chassis 6 has first to fourth chassis members 6a to 6d along the first to fourth side walls 52a to 52d. The panel chassis 6 is formed by a first chassis member 6a, a second chassis member 6b, a third chassis member 6c, and a fourth chassis member 6d (hereinafter may be simply collectively referred to as chassis members 6a to 6d). It is formed in a shape. The panel chassis may have a shape other than the substantially rectangular frame shape, and the number of the plurality of chassis members may be other than four. In this embodiment, the chassis members 6a to 6d are provided continuously along one side of the panel chassis 6, but the chassis members 6a to 6d are interrupted in the longitudinal direction along one side of the panel chassis 6. You may.

Hereinafter, the chassis members 6a to 6d will be described using the first chassis member 6a (hereinafter, referred to as the chassis member 6a) as an example. As shown in FIGS. 3 to 5, the chassis member 6a faces a plate-shaped portion 61 extending along the inner surface 521 of the side wall 52 of the backlight chassis 5 and a peripheral edge of the front surface of the light guide plate 4. Thus, a holding portion 62 extending inward from the plate-shaped portion 61 is provided.

The plate-shaped portion 61 has an outer surface 61 a facing the inner surface 521 of the side wall 52 and an inner surface 61 b facing the end surface 41 of the light guide plate 4. The outer surface 61a of the plate portion 61 is attached to the side wall 52 via a protrusion PR as described later. The inner surface 61 b of the plate-shaped portion 61 is arranged apart from the end surface 41 of the light guide plate 4. As shown in FIG. 3, at a position where the light source 2 is provided between the end surface 41 of the light guide plate 4 and the inner surface 521 of the side wall 52, the inner surface 61 b of the plate portion 61 sandwiches the light source 2. At the end face 41 of the light guide plate 4.

4) As shown in FIGS. 4 and 5, the plate-shaped portion 61 is formed in an elongated plate-like shape extending along the longitudinal direction of the side wall 52 facing the plate-shaped portion 61. Since the plate portion 61 is disposed inside the side wall 52, the length of the plate portion 61 in the longitudinal direction is slightly shorter than the length of the side wall 52 facing the plate portion 61 in the longitudinal direction. The height (length in the direction perpendicular to the bottom 51) of the plate-shaped portion 61 is substantially the same as or slightly lower than the height (length in the direction perpendicular to the bottom 51) of the side wall 52. . The thickness of the plate portion 61 (the length in the direction perpendicular to the outer surface 61 a or the inner surface 61 b of the plate portion 61) is shorter than the gap between the inner surface 521 of the side wall 52 and the end surface 41 of the light guide plate 4. When the light source 2 is provided between the inner surface 521 of the side wall 52 and the end surface 41 of the light guide plate 4, the thickness of the plate-shaped portion 61 is larger than the gap between the inner surface 521 of the side wall 52 and the light source 2. Is also short.

The holding portion 62 is configured to be opposed to the peripheral edge of the front surface of the light guide plate 4 and to be able to press the peripheral edge of the front surface of the light guide plate 4. As shown in FIGS. 4 and 5, the holding portion 62 extends inward from the plate portion 61, and is configured such that a cross section perpendicular to the longitudinal direction of the chassis member 6a is substantially L-shaped. I have.

4 and 5, the plate-shaped portion 61 of the chassis member 6a has a protrusion PR protruding from the outer surface 61a of the plate-shaped portion 61 facing the inner surface 521 of the side wall 52. On the other hand, the side wall 52 of the backlight chassis 5 has a guide groove G through which the protrusion PR is guided, as shown in FIG. As will be described in detail later, the projection PR provided on the plate-shaped portion 61 of the chassis member 6a is guided by the guide groove G provided on the side wall 52 of the backlight chassis 5, and the chassis member 6a is mounted on the backlight chassis 5. It is attached. In addition, the protrusion PR can contact an abutting portion C described later provided in the guide groove G, and suppresses detachment of the chassis member 6a from the backlight chassis 5.

In the present embodiment, the protrusion PR is provided on all of the first to fourth chassis members 6a to 6d, but is provided on at least one of the first to fourth chassis members 6a to 6b. Just do it. Further, the number of protrusions PR provided on one chassis member is not particularly limited. In the present embodiment, a plurality of protrusions PR are provided along the longitudinal direction of the chassis members 6a to 6d (see FIG. 1). More specifically, the protrusions PR are provided at three places, that is, at the end regions on both sides in the longitudinal direction of the chassis members 6a to 6d and at the center.

The shape of the protrusion PR is not particularly limited as long as the protrusion PR can be guided along the guide groove G and can be kept in contact with the contact portion C to prevent detachment of the chassis members 6a to 6d from the backlight chassis 5. For example, the protrusion PR can be formed in a columnar shape such as a prism or a cylinder. In the present embodiment, it is a rectangular column that is long along the longitudinal direction of the chassis member 6a. The height of the protrusion PR from the outer surface 61 a of the plate-shaped portion 61 is preferably equal to or less than the thickness of the side wall 52 so that the tip of the protrusion PR does not project from the outer surface 522 of the side wall 52.

The guide groove G is a groove configured to guide the protrusion PR. In the present embodiment, the guide groove G is provided on all of the four side walls 52a to 52d, but may be provided on at least one of the four side walls 52a to 52d. Further, the number of guide grooves G provided on one side wall 52 may be provided in accordance with the number of protrusions PR provided on the chassis member. In the present embodiment, a plurality of guide grooves G are provided along the longitudinal direction of the side wall 52 (see FIG. 1). Specifically, the guide groove G is provided along the longitudinal direction of the side wall 52 at a position corresponding to the position where the protrusion PR is provided. It is provided in three places.

As shown in FIGS. 5 and 6, the guide groove G opens at the upper end 523 of the side wall 52, and introduces the protrusion PR into the guide groove G, and approaches the protrusion PR from the introduction part G 1 to the bottom 51. And a second guide portion G3 that is continuous with the first guide portion G2 and guides the protrusion PR in the longitudinal direction of the side wall 52. In addition, the second guide portion G3 has a contact portion C that contacts the protrusion PR to restrict the movement of the chassis member 6a when the chassis member 6a moves in a direction away from the bottom 51. In the present embodiment, the guide groove G penetrates in the thickness direction of the side wall 52 as shown in FIG. 5, but the guide groove G is formed as a concave portion that does not penetrate in the thickness direction of the side wall 52. You may.

The introduction part G1 is a part for introducing the protrusion PR toward the first guide part G2 of the guide groove G. The introduction portion G1 is opened at the upper end 523 of the side wall 52, that is, at the end surface on the side opposite to the bottom portion 51 in the height direction of the side wall 52, in such a size that the projection PR can be introduced toward the first guide portion G2. .

The first guide portion G2 guides the projection PR introduced from the introduction portion G1 so as to approach the bottom portion 51. In the present embodiment, the first guide portion G2 guides the protrusion PR in the height direction of the side wall 52, thereby moving the chassis member 6a relative to the backlight chassis 5 in the height direction of the side wall 52. Thus, the holding portion 62 of the chassis member 6a is moved to a position where the holding portion 62 can press the peripheral portion of the light guide plate 4. In the present embodiment, the first guide portion G2 extends in a direction perpendicular to the longitudinal direction of the side wall 52, as shown in FIGS. However, as long as the first guide portion G2 can guide the projection PR so as to approach the bottom portion 51, the first guide portion G2 may be curved, for example, as shown in FIG. 7 or FIG. 8, or may be inclined. Good.

The second guide portion G3 guides the protrusion PR in the longitudinal direction of the side wall 52. The second guide portion G3 moves the protrusion PR to the position of the contact portion C so that the protrusion PR does not separate from the first guide portion G2 when a force is applied to the protrusion PR in the height direction of the side wall 52. This is a guide path for moving the side wall 52 in the longitudinal direction. The length of the side wall 52 of the second guide portion G3 in the longitudinal direction can be such that at least a portion of the protrusion PR contacts the contact portion C when the protrusion PR moves to the end of the second guide portion G3. Any length is acceptable. In the present embodiment, the second guide portion G3 extends linearly in parallel with the longitudinal direction of the side wall 52. However, the second guide portion G3 may be inclined with respect to the longitudinal direction of the side wall 52 or may be curved.

The contact portion C comes into contact with the protrusion PR in the height direction of the side wall 52 when a force moving in a direction away from the bottom 51 of the backlight chassis 5 is applied to the chassis member 6a, and the side wall 52 of the chassis member 6a. Is restricted within a predetermined range. The contact portion C may be provided so as to be in contact with the protrusion PR when the protrusion PR is located at the end of the second guide portion G3, or slightly from the protrusion PR in the height direction of the side wall 52. May be provided so as to be separated from each other. In the present embodiment, the second guide portion G3 has a first edge portion G31 near the bottom portion 51 and a second edge portion G32 far from the bottom portion 51, and the contact portion C extends from the bottom portion 51. It is constituted by a distant second edge G32.

As described above, in the present embodiment, the plate-shaped portion 61 of the panel chassis 6 has the protrusion PR projecting from the outer surface 61a, and the side wall 52 of the backlight chassis 5 has the guide groove G for guiding the protrusion PR. doing. The guide groove G includes an introduction portion G1 opened at the upper end 523 of the side wall 52, a first guide portion G2 for guiding the protrusion PR closer to the bottom portion 51, and a second guide for guiding the protrusion PR in the longitudinal direction of the side wall 52. It has a portion G3. Further, the second guide portion G3 has a contact portion C that contacts the protrusion PR to restrict the movement of the chassis member 6a. As shown in FIGS. 6 and 9, when attaching the panel chassis 6 to the side wall 52 of the backlight chassis 5, the projection PR provided on the outer surface 61 a of the plate-shaped portion 61 is opened at the upper end 523 of the side wall 52. It is moved from the introduction part G1 to the bottom part 51 along the first guide part G2. At this time, as shown in FIG. 9, the outer surface 61a of the plate-shaped portion 61 slides in the height direction of the side wall 52 in a state parallel to the inner surface 521 of the side wall 52.

Next, with the outer surface 61a of the plate-shaped portion 61 of the panel chassis 6 and the inner surface 521 of the side wall 52 of the backlight chassis 5 parallel to each other, the protrusion PR is moved from the first guide portion G2 toward the second guide portion G3. Move. As a result, the protrusion PR moves to a position opposing the contact portion C in the height direction of the side wall 52, and the protrusion PR and the contact portion C can be engaged with each other in the height direction of the side wall 52. Therefore, for example, when the backlight device 1 is transported to a place where another process of assembling the liquid crystal panel P is performed in a state where the panel chassis 6 and the backlight chassis 5 are assembled together, The panel chassis 6 is prevented from detaching from the backlight chassis 5 due to vibration at the time, and the light guide plate 4 is prevented from being damaged due to the shock at the time of vibration.

Further, since the protrusion PR is introduced from the introduction portion G1 opened at the upper end 523 of the side wall 52 to the first guide portion G2, the inner surface 61b of the plate-shaped portion 61 is bent toward the end surface 41 of the light guide plate 4. Never do. Therefore, as shown in FIG. 9, when the plate-shaped portion 61 of the panel chassis 6 is moved from the state before the attachment indicated by the two-dot chain line to the attachment state indicated by the solid line, the inner surface 521 of the side wall 52 is moved. It moves linearly into the gap between the light guide plate 4 and the end face 41. Therefore, even when the space between the inner surface 521 of the side wall 52 of the backlight chassis 5 and the end surface 41 (or the light source 2) of the light guide plate 4 is narrow due to the narrow bezel of the liquid crystal display device D or the like, the panel chassis 6 can be attached to the side wall 52 by inserting the plate-shaped portion 61.

In the present embodiment, as shown in FIG. 10, when the protrusion PR is located at the end of the second guide portion G3, the movement of the protrusion PR in the direction toward the first guide portion G2 is restricted. Further, the backlight chassis 5 has an engaging portion 53 that engages with the chassis member 6a. The engagement of any portion of the chassis member 6a with the engagement portion 53 of the backlight chassis 5 restricts the protrusion PR from moving toward the first guide portion G2. Accordingly, it is possible to further prevent the protrusion PR from moving toward the first guide portion G2 and further toward the introduction portion G1, and detaching the chassis member 6a from the backlight chassis 5.

In the present embodiment, as shown in FIG. 10, the engaging portion 53 has a step-like shape in the height direction of the side wall 52 with respect to the bottom 51 near the longitudinal end of the side wall 52 to which the chassis member 6 a is attached. Is formed. In this embodiment, from the state shown by the two-dot chain line in FIG. 10 to the state shown by the solid line, the chassis member 6a is mounted on the side wall while the first end E1 of the chassis member 6a rides on the engagement portion 53. 52 in the longitudinal direction. When the first end E1 of the chassis member 6a passes over the engaging portion 53, the end surface E11 of the first end E1 of the chassis member 6a and the engaging portion 53 are engaged in the longitudinal direction of the side wall 52. Thereby, the movement of the chassis member 6a in the longitudinal direction with respect to the side wall 52 is restricted, and the movement of the protrusion PR from the second guide part G3 toward the first guide part G2 is also restricted. Therefore, the protrusion PR provided on the chassis member 6a is held at a position where it contacts the contact portion C in the longitudinal direction of the side wall 52, and the detachment of the chassis member 6a from the backlight chassis 5 is suppressed.

More specifically, in the present embodiment, when the chassis member 6a having the protrusion PR is attached to the first side wall 52a (see FIG. 1), the second side wall 52b intersecting with the first side wall 52a is connected to the first side wall 52a. A notch N (see FIG. 10) cut out from the upper end to the bottom of the second side wall 52d is provided near the intersection. The notch N is cut so that the first end E1 of the chassis member 6a can protrude from the outer surface 522 of the side wall 52 of the backlight chassis 5. The notch N is cut out so as to form a step between the inner surface of the second side wall 52b and the bottom 51 at a height at which the end surface E11 of the first end E1 of the chassis member 6a can engage. The step forms the engaging portion 53. Since the chassis member 6a is an elongated member having flexibility, in a state where the protrusion PR of the chassis member 6a has moved to the end of the first guide portion G2 (the state indicated by the two-dot chain line in FIG. 10), The first end E1 projects outside the backlight chassis 5 from the cutout N in a bent state. In this state, when the chassis member 6a is moved leftward in FIG. 10, the protrusion PR moves along the second guide portion G3. At the same time, the first end E1 of the chassis member 6a moves toward the bottom 51 at a position beyond the inner surface of the second side wall 52b. As a result, the end surface E11 of the first end E1 of the chassis member 6a and the step-shaped engagement portion 53 located between the cutout N of the second side wall 52b and the bottom 51 are engaged.

In addition, as shown in FIGS. 11 and 12, the engaging portion 53 is provided between the first guide portion G2 and the end of the second guide portion G3 in the height direction of the side wall 52 in the second guide portion G3. The projection PR may be formed in a step shape so as to engage with the engagement portion 53. For example, in the mode shown in FIG. 11, the first edge G31 near the bottom of the second guide G3 is lower in height from the bottom 51 than the terminal end G21 of the first guide G2. It is configured. The stepped portion between the portion where the height of the first edge portion G31 is reduced and the terminal end G21 of the first guide portion G2 constitutes the engaging portion 53. In the mode shown in FIG. 11, the protrusion PR that has moved to the end of the second guide portion G3 is engaged with the step-shaped engagement portion 53 and the end of the protrusion PR, and the protrusion PR is Movement in the direction is regulated.

In addition, in the mode shown in FIG. 12, a protruding engaging portion 53 is formed to protrude from the first edge G31 of the second guide portion G3 toward the opposing second edge G32. In the case of the engagement portion 53 shown in FIG. 12, after the projection PR has moved from the first guide portion G2 over the projecting engagement portion 53 to the end of the second guide portion G3, the projection PR becomes the first guide portion. Movement toward G2 is restricted. Note that the width (in the height direction of the side wall 52) of the second guide portion G3 at the portion where the projecting engagement portion 53 is provided is larger than the width (in the height direction of the side wall) of the projection PR. It may be slightly smaller or may be larger than the width of the protrusion PR. Further, the protruding engagement portion 53 may be provided on the second edge portion G32 of the second guide portion G3, or may be provided on both the first edge portion G31 and the second edge portion G32. It may be.

[Embodiment 2]
Next, a backlight device according to the second embodiment will be described. Note that the points described in each configuration of the first embodiment can be similarly applied to the backlight device of the second embodiment.

In the backlight device 1 according to the second embodiment, one chassis member 6a provided along the longitudinal direction of the side wall 52 includes a pair of chassis elements extending along the longitudinal direction of the side wall 52, as shown in FIG. CE1 and CE2, and a spacer member S interposed between the pair of chassis elements CE1 and CE2.

The pair of chassis elements CE1 and CE2 are members of the chassis member 6a that together with the spacer member S constitute one chassis member 6a along the longitudinal direction of the side wall 52. The length of the pair of chassis elements CE1 and CE2 along the longitudinal direction of each side wall 52 is shorter than the length of the long side extending in the longitudinal direction of the side wall 52, and a spacer is provided between the pair of chassis elements CE1 and CE2. When the member S is disposed, the total length of the pair of chassis elements CE1, CE2 and the spacer member S is configured to correspond to the length of the long side of the side wall 52. The pair of chassis elements CE1 and CE2 are the same as the chassis members 6a to 6d of the first embodiment except that the length of the side wall 52 along the longitudinal direction is shorter than the chassis members 6a to 6d of the first embodiment. It can be configured.

それぞれ Each of the pair of chassis elements CE1 and CE2 has at least one protrusion PR. In the present embodiment, as shown in FIG. 13, the chassis elements CE1 and CE2 each have a single projection PR, but each of the chassis elements CE1 and CE2 has two or more projections PR. May be provided.

において In the present embodiment, the basic configuration of the side wall 52 is the same as that of the first embodiment. However, in the first embodiment, the direction in which the second guide portion G3 extends with respect to the first guide portion G2 in the plurality of guide grooves G provided in one side wall 52 is the same as that in the second embodiment. 13, the direction in which the second guide portion G3 extends with respect to the first guide portion G2 is symmetrical with respect to the center of the side wall 52, as shown in FIG. That is, the second guide portion G3 of the pair of guide grooves G extends toward the longitudinal end of the side wall 52 with respect to the first guide portion G2.

As shown in FIG. 14, when the projection PR is located in the first guide portion G2 of the guide groove G, the pair of chassis elements CE1 and CE2 are spaced apart from each other with a predetermined gap along the longitudinal direction of the side wall 52. Be placed. At this time, when the side wall 52 to which the chassis elements CE1 and CE2 are attached is the first side wall 52a (see FIG. 1), the inner surface of the second side wall 52b (see FIG. 1) intersecting with the first side wall 52a and the second side wall 52b A gap is formed between the inner surface of the chassis element CE1 and the end of the chassis element CE1 facing the inner surface. In addition, there is a gap between the fourth sidewall 52d (see FIG. 1) intersecting with the first sidewall 52a and the chassis element CE2.

The spacer member S is inserted vertically between the pair of chassis elements CE1 and CE2 with respect to the bottom 51, as shown in FIGS. At this time, the gap between the pair of chassis elements CE1 and CE2 is widened by the side edges Sa and Sb of the spacer member S in the longitudinal direction of the side wall 52. The chassis elements CE1 and CE2 have contact portions CP with which the side edges Sa and Sb of the spacer member S contact. When the side edges Sa and Sb of the spacer member S press the contact portion CP, the pair of chassis elements CE1 and CE2 move so as to widen the gap between each other.

In the present embodiment, the spacer member S is formed in a plate shape (see FIG. 13), and has an inclined surface at the side edges Sa and Sb of the spacer member S and / or the contact portions CP of the chassis elements CE1 and CE2. . In this case, the force by the vertical movement of the spacer member S into the gap between the chassis elements CE1 and CE2 is converted into the force to move the chassis elements CE1 and CE2 in the longitudinal direction of the side wall 52 via the inclined surface. Then, as shown in FIGS. 15 and 16, the chassis elements CE1, CE2 move away from each other. In the present embodiment, the chassis elements CE1 and CE2 are moved by the inclined surfaces of the side edges Sa and Sb of the spacer member S. However, the chassis elements CE1 and CE2 may be moved away from each other by inclined surfaces provided on the chassis elements CE1 and CE2. The structure of the side edges Sa and Sb of the spacer member S and the contact portion CP of the chassis elements CE1 and CE2 is such that the space between the chassis elements CE1 and CE2 is formed by inserting the spacer member S vertically to the bottom 51. There is no particular limitation as long as it can be spread.

(4) By expanding the gap between the chassis elements CE1 and CE2 by the spacer member S, the chassis elements CE1 and CE2 slide along the longitudinal direction of the side wall 52 as shown in FIG. At the same time, the protrusion PR provided on the chassis elements CE1 and CE2 moves along the second guide portion G3, and moves to the end of the second guide portion G3. By inserting the spacer member S between the chassis elements CE1 and CE2, the pair of chassis elements CE1 and CE2 and the spacer member S constitute one chassis member 6a extending along the longitudinal direction of the side wall 52. As described above, in the present embodiment, the pair of chassis elements CE1 and CE2 are moved from the center to the

ends

524 and 525 in the longitudinal direction of the side wall 52. Therefore, the end of the chassis member 6a does not interfere with the backlight chassis 5 before the chassis member 6a is slid along the second guide portion G3 as in the first embodiment. Therefore, it is not necessary to provide the notch N or the like in the backlight chassis 5, and it is not necessary to complicate the structure of the backlight chassis 5, and it is possible to suppress a decrease in the strength of the backlight chassis 5. Further, in the present embodiment, after the projection PR of the pair of chassis elements CE1 and CE2 is inserted into the first guide portion G2 of the guide groove G, the spacer member S is simply inserted, so that the space between the chassis member 6a and the backlight chassis 5 can be obtained. Is completed. Therefore, assembling between the chassis member 6a and the backlight chassis 5 is easy, and workability is improved.

In addition, in the present embodiment, the pair of chassis elements CE1 and CE2 move toward the

ends

524 and 525 of the side wall 52, respectively. Therefore, the two projections PR provided on the chassis elements CE1 and CE2 move in the direction from the center toward the

ends

524 and 525 in the longitudinal direction of the side wall 52, respectively. Therefore, the final position of the protrusion PR can be arranged closer to the

ends

524 and 525 of the side wall 52 as compared with the first embodiment. Thus, the lifting of the chassis member 6a in the direction away from the bottom 51 near the

ends

524 and 525 of the side wall 52 is suppressed, and the corners of the light guide plate 4 are more reliably pressed by the holding portions 62 of the chassis member 6a. be able to. Therefore, it is possible to further suppress the floating of the light guide plate 4 due to the warpage at the corners.

Further, in the present embodiment, the opposing ends of the pair of chassis elements CE1 and CE2 have a first housing recess R1 and a second housing recess R2 for housing the spacer member S, as shown in FIG. ing. The spacer member S is disposed between the pair of chassis elements CE1 and CE2 by the gap between the first and second housing recesses R1 and R2 and the chassis elements CE1 and CE2. As shown in FIG. 13, the first and second housing recesses R1 and R2 have wall portions W1 and W2 facing the inner surface 521 of the side wall 52. The provision of the wall portions W1 and W2 allows the plate-shaped spacer member S to be pushed into the gap between the chassis elements CE1 and CE2 and the inner surface 521 of the side wall 52 and the wall portions W1 and W2. Guided between. Therefore, the spacer member S can be stably pushed in the vertical direction with respect to the bottom portion 51, and workability is improved.

Further, as shown in FIG. 17, guide protrusions GP are provided on the side edges Sa, Sb of the spacer member S along the insertion direction of the spacer member S, and guide protrusions GP are provided along the contact portions CP of the chassis elements CE1, CE2. A groove GG into which the part GP fits may be provided. Alternatively, a guide projection may be provided at the contact portion CP of the chassis elements CE1, CE2, and a groove may be provided at the side edges Sa, Sb of the spacer member S. As described above, when the spacer member S is inserted in a state where the guide protrusion GP is fitted in the groove portion GG, the insertion of the spacer member S is stabilized, and the spacer member S is easily pushed in the vertical direction with respect to the bottom portion 51. And workability is improved.

In the present embodiment, one chassis member provided along the longitudinal direction of the side wall 52 includes two chassis elements CE1 and CE2 and one spacer member S. However, one chassis member includes a plurality of chassis members. It may be constituted by a pair of chassis elements and a plurality of spacer members.

[Embodiment 3]
Next, a backlight device according to the third embodiment will be described. Note that the points described in each of the configurations of the first and second embodiments can be similarly applied to the backlight device of the third embodiment.

In the first and second embodiments, the projection PR is provided on the plate-shaped portion 61 of the chassis member 6a, and the guide groove G is provided on the side wall 52 of the backlight chassis 5. On the other hand, in the third embodiment, The protrusion PR is provided on the side wall 52, and the guide groove G is provided on the plate-shaped portion 61. Except for the protrusion PR and the guide groove G, the structure of the first and second embodiments can be applied almost as it is, so that the description of the common parts is partially omitted, and the differences from the first and second embodiments are described below. This will be mainly described.

In the present embodiment, as shown in FIGS. 18 to 21, the side wall 52 has a projection PR projecting from the inner surface 521 of the side wall 52 facing the outer surface 61 a of the plate-shaped portion 61. The plate-shaped portion 61 of the chassis member 6a has a guide groove G for guiding the protrusion PR. As shown in FIG. 18, the guide groove G is opened at the lower end 61c of the plate-shaped portion 61, and an introduction portion G1 for introducing the protrusion PR into the guide groove G, and a projection portion G from the introduction portion G1. It has a first guide portion G2 that guides to approach the upper end 61d, and a second guide portion G3 that is continuous with the first guide portion G2 and guides the protrusion PR in the longitudinal direction of the plate-shaped portion 61. The second guide portion G3 has a contact portion C that contacts the protrusion PR to restrict the movement of the chassis member 6a when the chassis member 6a moves in a direction away from the bottom 51. In the present embodiment, the second guide portion G3 has a first edge portion G31 close to the bottom portion 51 and a second edge portion G32 far from the bottom portion 51, and the contact portion C is connected to the bottom portion 51. It is constituted by the near first edge portion G31.

When the panel chassis 6 is attached to the side wall 52 of the backlight chassis 5, the projection PR provided on the inner surface 521 of the side wall 52 enters the introduction portion G1 opened at the lower end 61c of the plate-shaped portion 61 of the chassis member 6a. As shown in FIGS. 18 and 19, the chassis member 6a is moved toward the bottom 51 of the backlight chassis 5 (see FIG. 21). At this time, as shown in FIG. 21, the outer surface 61a of the plate portion 61 slides in the height direction of the side wall 52 in a state parallel to the inner surface 521 of the side wall 52.

Next, with the outer surface 61a of the plate-shaped portion 61 and the inner surface 521 of the side wall 52 of the backlight chassis 5 parallel to each other, as shown in FIGS. 19 and 20, the protrusion PR is moved from the first guide portion G2 to the first guide portion G2. 2 Move toward the guide part G3. As a result, the protrusion PR moves to a position opposing the contact portion C in the height direction of the side wall 52, and the protrusion PR and the contact portion C can be engaged with each other in the height direction of the side wall 52. Therefore, for example, when the backlight device 1 is transported to a place where another process of assembling the liquid crystal panel P is performed in a state where the panel chassis 6 and the backlight chassis 5 are assembled together, The panel chassis 6 is prevented from detaching from the backlight chassis 5 due to vibration at the time, and the light guide plate 4 is prevented from being damaged due to the shock at the time of vibration.

Further, since the protrusion PR is introduced from the introduction portion G1 opened at the lower end 61c of the plate portion 61 to the first guide portion G2, the inner surface 61b of the plate portion 61 is bent toward the end surface 41 of the light guide plate 4. I don't care. Accordingly, as shown in FIG. 21, when the plate-shaped portion 61 of the panel chassis 6 is moved from the state before the attachment indicated by the two-dot chain line to the attachment state indicated by the solid line, the inner surface 521 of the side wall 52 contacts the inner surface 521. It moves linearly into the gap between the light guide plate 4 and the end face 41. Therefore, even when the space between the inner surface 521 of the side wall 52 of the backlight chassis 5 and the end surface 41 (or the light source 2) of the light guide plate 4 is narrow due to the narrow bezel of the liquid crystal display device D or the like, the panel chassis 6 can be attached to the side wall 52 by inserting the plate-shaped portion 61.

Also in the present embodiment, similarly to Embodiment 1, when the protrusion PR is located at the end of the second guide portion G3, the protrusion PR is restricted from moving in the direction toward the first guide portion G2. It may have a joint. Since the configuration and operation and effect of the engaging portion are the same as those described in the first embodiment, detailed description will be omitted.

Further, in the present embodiment, similarly to the second embodiment, the chassis member 6a is interposed between the pair of chassis elements CE1 and CE2 extending along the longitudinal direction of the side wall and the pair of chassis elements CE1 and CE2. And a spacer member S having the same shape. The configuration, operation, and effect of the pair of chassis elements CE1, CE2 and the spacer member S are the same as those of the second embodiment, and thus detailed description is omitted. The second guide portion G3 provided on the chassis elements CE1 and CE2 extends toward the portion where the spacer member S is inserted with respect to the first guide portion G2.

[Summary]
(1) A backlight device according to an aspect 1 of the present invention includes a light source, a light guide plate having a front surface and a back surface, and emitting light incident from the light source from the front surface, and the light guide plate. A bottom portion facing the back surface of the light guide plate, and a backlight chassis accommodating the light source and the light guide plate, and a side wall extending from the bottom portion, between an inner surface of the side wall of the backlight chassis and an end surface of the light guide plate. A frame-shaped panel chassis configured to hold a front surface of the light guide plate, wherein each of the plurality of chassis members includes the side wall of the backlight chassis. A plate-shaped portion extending along the inner surface of the light guide plate, and a holding portion extending inward from the plate-shaped portion so as to face a peripheral portion of the front surface of the light guide plate. U The plate-shaped portion of at least one chassis member has a protrusion protruding from the outer surface of the plate-shaped portion facing the inner surface of the side wall, and the side wall of the backlight chassis has a guide groove through which the protrusion is guided. The guide groove has an opening at an upper end of the side wall, and an introduction portion for introducing the protrusion into the guide groove, and a first guide portion for guiding the protrusion from the introduction portion to approach the bottom. A second guide portion that is continuous with the first guide portion and guides the protrusion in a longitudinal direction of the side wall; the second guide portion moves in a direction in which the at least one chassis member moves away from the bottom portion; In a case where an attempt is made to have such a configuration, the contact member has a contact portion that contacts the protrusion and restricts movement of the at least one chassis member.

(2) In the backlight device according to (1), the second guide portion includes a first edge near the bottom and a second edge far from the bottom, extending along a longitudinal direction of the side wall. And the contact portion may be constituted by the second edge.

(3) In the backlight device according to (1) or (2), when the protrusion is located at an end of the second guide portion, the protrusion is restricted from moving in a direction toward the first guide portion. Further, the backlight chassis may have an engaging portion that engages with the at least one chassis member having the protrusion.

(4) In the backlight device according to (3), each of the plurality of chassis members is an elongated member that extends in a longitudinal direction of the opposing side wall, and the engagement portion has the at least one chassis member attached thereto. Near the longitudinal end of the side wall, a step is formed in the height direction of the side wall with respect to the bottom, and the first end of the at least one chassis member rides on the engaging portion. In this state, the at least one chassis member moves in the longitudinal direction of the side wall, and the first end of the at least one chassis member climbs over the engagement portion, so that the The end face of one end and the engaging portion may engage in the longitudinal direction of the side wall.

(5) In the backlight device according to (3), the engagement portion may include a step in the height direction of the side wall between the first guide portion and the end of the second guide portion in the second guide portion. And the protrusion may be engaged with the engagement portion.

(6) In the backlight device according to (1) or (2), the at least one chassis member is interposed between a pair of chassis elements extending along a longitudinal direction of the side wall and the pair of chassis elements. A pair of chassis elements each having the projection, and when the projection is located in the first guide portion, the pair of chassis elements move along the longitudinal direction of the side wall. The spacer member is inserted vertically between the pair of chassis elements with respect to the bottom portion, and is disposed between the pair of chassis elements by a longitudinal side edge of the side wall of the spacer member. When the gap between the chassis elements is widened, the pair of chassis elements slides along the longitudinal direction of the side wall, and the pair of chassis elements By moving the second guide portion is a projection provided on, it may be moved to the end of the second guide portion.

(7) In the backlight device of (6), the spacer member is formed in a plate shape, and the side edge of the spacer member contacts the side edge of the spacer member and / or the pair of chassis elements. The contact portion may have an inclined surface.

(8) A backlight device according to another aspect of the present invention includes a light guide plate having a light source, a front surface and a back surface, and emitting light incident from the light source from the front surface, and the light guide plate. A bottom portion facing the back surface of the light guide plate, and a backlight chassis accommodating the light source and the light guide plate, and a side wall extending from the bottom portion, between an inner surface of the side wall of the backlight chassis and an end surface of the light guide plate. A frame-shaped panel chassis configured to hold a front surface of the light guide plate, wherein each of the plurality of chassis members includes the side wall of the backlight chassis. A plate-shaped portion extending along the inner surface of the light guide plate, and a holding portion extending inward from the plate-shaped portion so as to face a peripheral portion of a front surface of the light guide plate, wherein the side wall is formed of the plate. Outer surface of the shape The plate-like portion of at least one chassis member having a protrusion protruding from the inner surface of the opposing side wall and facing the inner surface of the side wall having the protrusion among the plurality of chassis members is guided by the protrusion. A guide groove, wherein the guide groove is open at a lower end of the plate-shaped portion, and an introduction portion that introduces the protrusion into the guide groove; and the protrusion approaches the upper end of the plate-shaped portion from the introduction portion. And a second guide portion that is continuous with the first guide portion and guides the protrusion in a longitudinal direction of the plate-shaped portion, wherein the second guide portion includes the first guide portion. When one chassis member moves in a direction away from the bottom portion, the chassis member has an abutting portion that abuts on the protrusion to regulate the movement of the at least one chassis member.

(9) In the backlight device according to (8), the second guide portion includes a first edge near the bottom and a second edge far from the bottom, the first edge extending along the longitudinal direction of the side wall. And the contact portion may be configured by the first edge.

(10) In the backlight device according to (8) or (9), when the protrusion is located at an end of the second guide portion, the protrusion is restricted from moving in a direction toward the first guide portion. Further, the backlight chassis may have an engaging portion that engages with the at least one chassis member having the guide groove.

(11) In the backlight device according to (10), each of the plurality of chassis members is an elongated member extending in a longitudinal direction of the opposed side wall, and the engagement portion has the at least one chassis member attached thereto. Near the longitudinal end of the side wall, a step is formed in the height direction of the side wall with respect to the bottom, and the first end of the at least one chassis member rides on the engaging portion. In this state, the at least one chassis member moves in the longitudinal direction of the side wall, and the first end of the at least one chassis member climbs over the engagement portion, so that the The end face of one end and the engaging portion may engage in the longitudinal direction of the side wall.

(12) In the backlight device according to (8) or (9), when the protrusion is located at an end of the second guide portion, the protrusion is prevented from moving in a direction toward the first guide portion. The second guide portion is formed in a step-like shape in the height direction of the plate-shaped portion between the first guide portion and the end of the second guide portion, and the engagement portion engages with the protrusion. May be provided.

(13) In the backlight device according to (8) or (9), the at least one chassis member is interposed between a pair of chassis elements extending along a longitudinal direction of the side wall and the pair of chassis elements. A pair of chassis elements each having the guide groove, and when the projection is located in the first guide portion, the pair of chassis elements are arranged in a longitudinal direction of the side wall. The spacer member is inserted vertically between the pair of chassis elements with respect to the bottom portion, and is disposed between the pair of chassis elements by a side edge in a longitudinal direction of the side wall of the spacer member. When the gap between the pair of chassis elements is widened, the pair of chassis elements slide along the longitudinal direction of the side wall, and the pair of chassis elements are provided on the side wall. The projection is relatively moved to the second guide portions may be moved to the end of the second guide portion.

(14) In the backlight device according to (13), the spacer member is formed in a plate shape, and the side edge of the spacer member contacts the side edge of the spacer member and / or the pair of chassis elements. The contact portion may have an inclined surface.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope shown in the claims. Embodiments obtained by appropriately combining the technical features disclosed in the above-described embodiments are also included in the technical scope of the present invention.

REFERENCE SIGNS LIST 1 backlight device 2 light source 4 light guide plate 41 end surface of light guide plate 5 backlight chassis 51 bottom 52 side wall 521 inner surface of

side wall

524, 525 end of side wall 53 engaging portion 6 panel chassis 61 plate portion 61 a outer surface of plate portion 61c Lower end of plate-shaped part 61d Upper end of plate-shaped part 62 Holding part C Contact part CE1, CE2 Chassis element CP contact part E1 First end E11 End face of first end G Guide groove G1 Introducing part G2 First Guide portion G21 End of first guide portion G3 Second guide portion G31 First edge G32 Second edge PR Projection S Spacer member Sa, Sb Side edge

Claims

Light source,
A light guide plate having a front surface and a back surface, and emitting light incident from the light source from the front surface,
A bottom portion facing the back surface of the light guide plate, and a backlight chassis including a side wall extending from the bottom portion and housing the light source and the light guide plate;
A frame-shaped panel chassis comprising a plurality of chassis members disposed between an inner surface of the side wall of the backlight chassis and an end surface of the light guide plate, and configured to press a front surface of the light guide plate; With
Each of the plurality of chassis members has a plate-like portion extending along the inner surface of the side wall of the backlight chassis and an inner side from the plate-like portion so as to face a peripheral portion of a front surface of the light guide plate. And a holding portion extending toward
The plate portion of at least one chassis member of the plurality of chassis members has a protrusion protruding from an outer surface of the plate portion facing an inner surface of the side wall,
The side wall of the backlight chassis has a guide groove through which the protrusion is guided,
The guide groove is open at an upper end of the side wall, and an introduction portion for introducing the protrusion into the guide groove; a first guide portion for guiding the protrusion from the introduction portion to approach the bottom portion; A second guide portion that is continuous with the guide portion and guides the protrusion in a longitudinal direction of the side wall;
The second guide portion has a contact portion that contacts the protrusion and regulates the movement of the at least one chassis member when the at least one chassis member attempts to move in a direction away from the bottom. The backlight device.
The second guide portion has a first edge near the bottom and a second edge far from the bottom, extending along a longitudinal direction of the side wall,
The backlight device according to claim 1, wherein the contact portion is configured by the second edge.
The backlight chassis includes the at least one protrusion having the protrusion so as to restrict the protrusion from moving in the direction toward the first guide when the protrusion is located at the end of the second guide. The backlight device according to claim 1, further comprising an engagement portion that engages with the chassis member.
Each of the plurality of chassis members is an elongated member extending in the longitudinal direction of the opposed side wall,
The engagement portion is formed near the longitudinal end of the side wall to which the at least one chassis member is attached, in a stepped shape in the height direction of the side wall with respect to the bottom portion,
With the first end of the at least one chassis member riding on the engagement portion, the at least one chassis member moves in a longitudinal direction of the side wall, and the first end of the at least one chassis member is moved. 4. The back according to claim 3, wherein the end portion of the at least one chassis member gets over the engagement portion, whereby the end face of the first end of the at least one chassis member and the engagement portion engage in the longitudinal direction of the side wall. Light device.
The engaging portion is formed in the second guide portion in a stepped shape in a height direction of the side wall between the first guide portion and an end of the second guide portion, and the protrusion is formed by the engaging portion. The backlight device according to claim 3, wherein the backlight device is engaged with the backlight device.
The at least one chassis member has a pair of chassis elements extending along a longitudinal direction of the side wall, and a spacer member interposed between the pair of chassis elements.
Each of the pair of chassis elements has the protrusion, and when the protrusion is located in the first guide portion, the pair of chassis elements are arranged with a predetermined gap along the longitudinal direction of the side wall. And
The spacer member is inserted vertically between the pair of chassis elements with respect to the bottom, and a longitudinal edge of the side wall of the spacer member widens a gap between the pair of chassis elements. Thereby, the pair of chassis elements slide along the longitudinal direction of the side wall, and the protrusions provided on the pair of chassis elements move the second guide portion, and the end of the second guide portion The backlight device according to claim 1, wherein the backlight device moves to
The spacer member is formed in a plate shape, and has a slope at a contact portion where the side edge of the spacer member contacts the side edge of the spacer member and / or the pair of chassis elements. The backlight device according to claim 6.
Light source,
A light guide plate having a front surface and a back surface, and emitting light incident from the light source from the front surface,
A bottom portion facing the back surface of the light guide plate, and a backlight chassis including a side wall extending from the bottom portion and housing the light source and the light guide plate;
A frame-shaped panel chassis comprising a plurality of chassis members arranged between an inner surface of the side wall of the backlight chassis and an end surface of the light guide plate, and configured to press a front surface of the light guide plate; With
Each of the plurality of chassis members has a plate-like portion extending along the inner surface of the side wall of the backlight chassis and an inner side from the plate-like portion so as to face a peripheral portion of a front surface of the light guide plate. And a holding portion extending toward
The side wall has a protrusion protruding from an inner surface of the side wall facing an outer surface of the plate-shaped portion,
Of the plurality of chassis members, a plate-like portion of at least one chassis member facing the inner surface of the side wall having the protrusion has a guide groove through which the protrusion is guided,
The guide groove is open at a lower end of the plate-like portion, and an introduction portion for introducing the protrusion into the guide groove, and a first guide for guiding the protrusion from the introduction portion to approach an upper end of the plate-like portion. And a second guide portion that is continuous with the first guide portion and guides the protrusion in a longitudinal direction of the plate-shaped portion,
The second guide portion has a contact portion that contacts the protrusion and regulates the movement of the at least one chassis member when the at least one chassis member attempts to move in a direction away from the bottom. The backlight device.
The second guide portion has a first edge near the bottom and a second edge far from the bottom, extending along a longitudinal direction of the side wall,
The backlight device according to claim 8, wherein the contact portion is configured by the first edge.
The backlight chassis includes the guide groove so that the protrusion restricts movement of the protrusion in a direction toward the first guide portion when the protrusion is located at an end of the second guide portion. The backlight device according to claim 8, further comprising an engagement portion that engages with one chassis member.
Each of the plurality of chassis members is an elongated member extending in the longitudinal direction of the opposed side wall,
The engagement portion is formed near the longitudinal end of the side wall to which the at least one chassis member is attached, in a stepped shape in the height direction of the side wall with respect to the bottom portion,
With the first end of the at least one chassis member riding on the engagement portion, the at least one chassis member moves in a longitudinal direction of the side wall, and the first of the at least one chassis member is moved to a first position. 11. The back according to claim 10, wherein the end portion of the at least one chassis member goes over the engagement portion, whereby the end face of the first end of the at least one chassis member and the engagement portion engage in the longitudinal direction of the side wall. Light device.
The second guide unit is configured to control the movement of the protrusion in the direction toward the first guide unit when the protrusion is located at the end of the second guide unit. 10. The backlight device according to claim 8, wherein the backlight device has an engaging portion that is formed in a stepped shape in a height direction of the plate-like portion between the terminal portion and the end of the second guide portion and engages with the protrusion. .
The at least one chassis member has a pair of chassis elements extending along a longitudinal direction of the side wall, and a spacer member interposed between the pair of chassis elements.
Each of the pair of chassis elements has the guide groove, and when the projection is located in the first guide portion, the pair of chassis elements are separated by a predetermined gap along the longitudinal direction of the side wall. Placed,
The spacer member is inserted vertically between the pair of chassis elements with respect to the bottom, and a longitudinal edge of the side wall of the spacer member widens a gap between the pair of chassis elements. Accordingly, the pair of chassis elements slide along the longitudinal direction of the side wall, and the protrusion provided on the side wall relatively moves the second guide portion, and the end of the second guide portion The backlight device according to claim 8, wherein the backlight device moves to
The spacer member is formed in a plate shape, and has a slope at a contact portion where the side edge of the spacer member contacts the side edge of the spacer member and / or the pair of chassis elements. The backlight device according to claim 13.