WO2010146932A1

WO2010146932A1 - Display device and television receiver

Info

Publication number: WO2010146932A1
Application number: PCT/JP2010/057039
Authority: WO
Inventors: 匡史横田
Original assignee: シャープ株式会社
Priority date: 2009-06-17
Filing date: 2010-04-21
Publication date: 2010-12-23

Abstract

Disclosed is a display device, which can be provided as a final product for a television receiver and the like only by assembling a display panel and a backlight unit and has excellent workability in assembling the display panel to the backlight unit, while ensuring a large effective display region. The display device is provided with the hot-cathode tube (50), the liquid crystal panel (11) which performs display using light emitted from the hot-cathode tube (50), a first cabinet (Ca) having the liquid crystal panel (11) attached thereto, and a second cabinet (Cb) having the hot-cathode tube (50) attached thereto. The first cabinet (Ca) and the second cabinet (Cb) are engaged with each other, and the first cabinet (Ca) and the second cabinet (Cb) form an outer casing that constitutes the external appearance of the liquid crystal display device (10). The display device is also provided with an optical sheet (20), which is disposed between the first cabinet (Ca) and the second cabinet (Cb) and diffuses light emitted from the hot-cathode tube (50), and a supporting pin (72), which is attached to the second cabinet (Cb) and supports the optical sheet (20).

Description

Display device, TV receiver

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

For example, a liquid crystal panel used in a liquid crystal display device such as a liquid crystal television does not emit light, and thus requires a backlight as a separate lighting device. In the liquid crystal display device described in Patent Document 1, the backlight includes a chassis that houses a plurality of cold-cathode tubes and a frame for positioning an optical member in the chassis. It has the structure hold | maintained at the assembly | attachment state by the bezel covered from the front side of the panel. And this television receiver is comprised so that this liquid crystal display device may be pinched | interposed by the front and back cabinets which are external components. In other words, as explicitly disclosed in Patent Document 1, a liquid crystal panel and a backlight are separately manufactured, and the liquid crystal display device is manufactured by assembling them together using a bezel or the like. A television receiver is manufactured by sandwiching between a pair of cabinets.

JP 2008-293711 A

(Problems to be solved by the invention)
In the technique of Patent Document 1, a liquid crystal panel and a backlight are separately produced, assembled in separate processes, and further accommodated in a cabinet in separate processes. Since the number of processes increases, it is not always an efficient method. In the technique of Patent Document 1, the liquid crystal panel is assembled to the backlight by the bezel. For example, when the liquid crystal panel is directly mounted on the backlight and then mounted by the bezel, the portion to be mounted If the width is made wider, the effective display area of the liquid crystal panel becomes smaller, so that the mounting portion needs to be made narrower. However, placing the liquid crystal panel in the narrow portion has a problem that workability is low compared to placing the liquid crystal panel in the wide portion.

The present invention has been made in view of the above problems, and can be provided as a final product such as a television receiver only by assembling a display panel and a backlight, and while ensuring a wide effective display area, An object of the present invention is to provide a display device that is excellent in workability when the display panel is assembled to a backlight. It is another object of the present invention to provide a television receiver provided with such a display device.

(Means for solving the problem)
In order to solve the above problems, a display device according to the present invention includes a light source, a display panel that performs display using light of the light source, a first cabinet to which the display panel is attached, and the light source attached. And the first cabinet and the second cabinet are engaged with each other, and the first cabinet and the second cabinet constitute an outer box constituting the appearance of the display device. An optical sheet that is disposed between the first cabinet and the second cabinet and diffuses light from the light source; a sheet support member that is attached to the second cabinet and supports the optical sheet; It is provided with.

According to the above configuration, since the display panel is attached to the first cabinet and the light source is attached to the second cabinet, the display function of the display panel using the light from the light source is realized by engaging each cabinet. Can be possible. In addition, since the first cabinet and the second cabinet constitute an outer box that forms the appearance of the display device, the display device can be used as a final device such as a television receiver only by engaging the first cabinet and the second cabinet. It can be used as a product. In particular, in the present invention, since a mounting member such as a bezel is eliminated, the material cost can be reduced. In addition, since the number of assembling steps is reduced as compared with the case of providing a final product such as a television receiver by housing this in a separate cabinet after assembling the panel and backlight as in the prior art, In this respect as well, cost reduction can be realized. Further, since the alignment between the display panel and the backlight is realized by assembling the first cabinet and the second cabinet, the workability is improved, and it is necessary to secure an alignment area in the display panel. Disappear. Therefore, alignment can be easily performed without causing a situation where the effective display area of the display panel becomes small.

Also, since the optical sheet for diffusing the light from the light source is provided, the luminance of the light emitted to the display panel can be made uniform over the entire surface of the display panel. Furthermore, since the optical sheet can be supported by the sheet support member, it is possible to suppress the bending of the optical sheet, and it is possible to suppress the luminance unevenness caused by the bending.

The said structure WHEREIN: The support part formed by protruding a part of bottom wall in the said 2nd cabinet to the said optical sheet side is provided, The said sheet | seat support member shall be attached to the said support part.
Since the support portion is formed by protruding a part of the bottom wall of the second cabinet to the optical sheet side and the sheet support member is attached to the support portion, the sheet support member is directly attached to the bottom wall of the second cabinet. Compared with the configuration, the attachment location is arranged closer to the front side (for example, a position closer to the work machine or the like). For this reason, the work of attaching the seat support member is facilitated, and the work time related to the attachment can be shortened.

The light source includes a reflection sheet that reflects light from the light source toward the optical sheet, and a flat reflection sheet support member that is supported by the support and can support the reflection sheet. it can.
According to such a configuration, the light from the light source can be reflected by the reflection sheet, and the luminance can be increased. By the way, since the support part is formed in the 2nd cabinet in this invention, the inner surface of the bottom wall is not flush, but the unevenness | corrugation is formed. When a reflection sheet is attached to the surface on which the irregularities are formed, the reflection sheet may be bent or floated, resulting in uneven brightness. Therefore, in the present invention, by providing a flat sheet support member that supports the reflection sheet as in the above-described configuration, the occurrence of bending and floating in the reflection sheet is suppressed.

The power supply board includes a power supply board for supplying power to the light source, and the power supply board is housed in the second cabinet between the sheet support member and the bottom wall. It can be arranged in the part.
By arranging the sheet supporting member on the supporting portion, the power supply substrate is arranged on the substrate housing portion that is inevitably formed. For this reason, it is not necessary to separately provide a space for arranging the power supply substrate, and the display device can be miniaturized.

Further, as the light source, a cathode tube can be exemplified. With such a configuration, for example, the size can be reduced as compared with a light source such as an incandescent lamp, and the luminance can be further increased.

Further, as the light source, a light emitting diode can be exemplified. With such a configuration, power consumption can be suppressed.

Further, at least one of the first cabinet and the second cabinet can be made of synthetic resin. With such a configuration, it is possible to reduce the weight and cost of the cabinet.

Further, at least one of the first cabinet and the second cabinet can be made of metal. With such a configuration, the strength of the cabinet can be increased. In the case of a configuration including a power supply board, by surrounding the power supply board with metal, electromagnetic wave noise from the power supply board can be prevented from being radiated to the outside of the display device. And the operational reliability of the power supply board can be further increased.

A liquid crystal panel can be exemplified as the display panel. Such a display device can be applied as a liquid crystal display device to various uses, for example, a desktop screen of a television or a personal computer, and is particularly suitable as an ultra-thin television receiver.

(The invention's effect)
According to the present invention, it is possible to provide a final product such as a television receiver simply by assembling the first cabinet and the second cabinet, and when the panel is assembled to the backlight while ensuring a wide effective display area. It is possible to provide a display device having excellent workability. In addition, it is possible to provide a television receiver configured with such a display device.

The disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 1 of this invention. The cross-sectional schematic diagram showing the state which cut | disconnected the liquid crystal display device along the long side direction. The exploded view which decomposes | disassembles and shows each component in FIG. FIG. 3 is a schematic diagram illustrating a mode in which a liquid crystal panel is attached to the first cabinet in the first embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2 (enlarged view around the light source). FIG. 4 is a schematic cross-sectional view illustrating a configuration of a liquid crystal display device according to a second embodiment. The exploded view which decomposes | disassembles and shows each component in FIG.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an X axis, a Y axis, and a Z axis are shown in a part of each drawing, and each axis direction is drawn to be a direction shown in each drawing. Also, the upper side shown in FIGS. 2 to 3 is the front side, and the lower side is the back side. The television receiver TV according to the present embodiment shown in FIG. 1 includes a liquid crystal display device 10, a stand S on which the liquid crystal display device 10 is placed, a power source, a tuner, and the like (not shown). ing.

The liquid crystal display device (display device) 10 has a horizontally long rectangular shape as a whole, and is supported by the stand S so that the display surface is along the vertical direction (Y-axis direction). The liquid crystal display device 10 can be mounted with a backlight device 12 (illumination device) that is an external light source, a liquid crystal panel 11 (display panel) that performs display using light from the backlight device 12, and a liquid crystal panel 11. And a first cabinet Ca.

The backlight device 12 includes a hot cathode tube 50 (light source), a circuit board 80, and a second cabinet Cb that can accommodate the hot cathode tube 50 and the circuit board 80. The first cabinet Ca and the second cabinet Cb have substantially the same outer shape in plan view, and the first cabinet Ca and the second cabinet Cb are engaged with each other, so that the external components of the liquid crystal display device 10 are obtained. Is configured.

The first cabinet Ca is composed of a frame-shaped synthetic resin member, and the liquid crystal panel 11 is attached so as to be accommodated in the frame, and the display surface 11a of the liquid crystal panel 11 is disposed in the frame. A speaker 11b and the like are provided on the surface side of the first cabinet Ca. On the other hand, as shown in FIG. 2, the second cabinet Cb is configured by a box-shaped synthetic resin member having an opening on the front side, and includes a bottom surface 30 constituting the box bottom and a wall portion 31 standing from the bottom surface 30. I have.

Specifically, the second cabinet Cb is attached to the first cabinet Ca on the side opposite to the display surface 11a of the liquid crystal panel 11, and light is transmitted from the hot cathode tube 50 of the second cabinet Cb to the liquid crystal panel 11. It is a configuration to be supplied. An optical sheet 20 is disposed between the first cabinet Ca and the second cabinet Cb, specifically between the liquid crystal panel 11 and the hot cathode tube 50, and diffuses light from the hot cathode tube 50 in a planar shape. is doing.

The liquid crystal panel 11 is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, an alignment film, and the like. A polarizing plate is disposed on the outside of both glass substrates.

As shown in FIG. 2, the optical sheet 20 includes a diffuser plate 22 having a large thickness disposed on the second cabinet Cb side, and a sheet 21 having a small thickness disposed on the first cabinet Ca side (such as a diffuser lens and the like). A reflective polarizing sheet or the like). The diffusing plate 22 has a function of diffusing linear light emitted from the hot cathode tube 50 serving as a linear light source, in which light scattering particles are dispersed and blended with a plate member made of synthetic resin.

Subsequently, the configuration of the first cabinet Ca will be described. As shown in FIG. 2, the first cabinet Ca has a claw portion 13 for locking the liquid crystal panel 11. As shown in FIG. 4, the claw portion 13 includes a locking surface 13b, and a liquid crystal is formed between the locking surface 13b and an elastic member (polon or the like) 16 arranged to face the locking surface 13b. The panel 11 is sandwiched. Further, the claw portion 13 itself is elastically deformable, and when the liquid crystal panel 11 is attached to the first cabinet Ca, the claw portion 13 is elastically deformed in the direction in which the claw portion 13 is expanded (outside), and the liquid crystal panel 11 is attached. After being formed, the liquid crystal panel 11 is elastically restored in the direction of tightening (inner side).

Further, the claw portion 13 of the first cabinet Ca guides the liquid crystal panel 11 in the pushing direction (arrow direction in FIG. 4) when the liquid crystal panel 11 is accommodated in the locking surface 13b of the claw portion 13. The inclined surface 13a is provided so that the nail | claw part 13 can be elastically deformed with pushing. In addition, the convex part accommodating part 18 for accommodating the convex part 35 of the 2nd cabinet Cb mentioned later is formed in the back side of the nail | claw part 13, ie, the opposite side to the side which latches the liquid crystal panel 11. FIG. In addition, a clamping piece 14 for clamping the optical sheet 20 is formed in the first cabinet Ca.

Subsequently, the configuration of the second cabinet Cb will be described. The second cabinet Cb has a rectangular shape in plan view, and includes a bottom plate Cb1 constituting the bottom surface 30 and a wall plate Cb2 constituting the wall portion 31 as shown in FIG. The wall portion 31 is inclined so as to be directed inward at a predetermined angle with respect to the bottom surface 30.

In the second cabinet Cb, a reflection sheet support plate 40 is disposed near the center in the Z-axis direction (detailed configuration will be described later). As a result, the inner area of the second cabinet Cb (the area surrounded by the bottom surface 30 and the wall portion 31) is partitioned by the reflection sheet support plate 40, and in the front and back direction (thickness direction of the second cabinet Cb). Two regions are arranged side by side. Specifically, a region located on the front side of the reflective sheet support plate 40 among the partitioned internal regions is a light source arrangement unit 95 in which the hot cathode tubes 50 are mainly arranged. On the other hand, a region located behind the reflective sheet support plate 40 in the partitioned internal region is a substrate housing portion 90 in which the circuit substrate 80 is disposed.

As shown in FIG. 2, in the wall portion 31, a placement portion 37 is formed in the vicinity of the center in the Z-axis direction (thickness direction of the second cabinet Cb) so as to protrude inside the second cabinet Cb. An end portion of the hot cathode tube 50 is supported on the mounting portion 37 via a socket 51. As shown in FIG. 2, the hot cathode tube 50 is a linear light source having an elongated tubular shape, and its longitudinal direction (axial direction) matches the longitudinal direction (X-axis direction) of the second cabinet Cb. It is arranged with. In the Y-axis direction, a plurality of hot cathode tubes 50 are arranged in parallel with each other (see FIG. 1).

The hot cathode tube 50 includes a hollow glass tube 50 a having a circular outer shape in cross-sectional view, and a pair of electrodes (not shown) disposed at both ends of the glass tube 50 a. The circuit board 80 (inverter board) described later is electrically connected. Further, mercury and rare gas are enclosed in the glass tube 50a and a fluorescent material is applied to the inner wall surface thereof. The hot cathode tube 50 is supplied with driving power from the inverter board and can control the tube current value, that is, the luminance (lighting state) by the inverter board.

At the protruding end of the mounting portion 37, a sheet mounting portion 38 capable of fitting the peripheral edge of the reflective sheet support plate 40 is formed by denting the surface to the back side. The reflection sheet support plate 40 (reflection sheet support member) is for supporting a bottom portion 60A of the reflection sheet 60 described later, and is disposed so as to cover almost the entire surface of the bottom plate Cb1. The reflection sheet support plate 40 is made of, for example, a synthetic resin, and has an outer shape slightly larger than the bottom 60A of the reflection sheet 60 in plan view. By fitting the peripheral edge of the reflection sheet support plate 40 to the sheet placement portion 38, the position of the reflection sheet support plate 40 is prevented from shifting in the plane direction (X-axis and Y-axis directions).

The support part 42 is formed by protruding a part of the bottom plate Cb1 to the front side. The support portion 42 supports the reflection sheet support plate 40 from the back side, and is attached with a locking portion 73 of a lamp clip 70 described later. As shown in FIGS. 2 and 5, both directions of the X axis and the Y axis are provided. In FIG. 3, the lamp clip 70 is disposed at a plurality of locations (locations where the locking portions 73 of the lamp clip 70 are disposed). The surface 42A of the support portion 42 is set to have the same height as the surface of the sheet placement portion 38 (sheet placement surface 38A) in the Z-axis direction. Thus, the reflection sheet support plate 40 is supported by the sheet placement surface 38A and the surface 42A of the support portion 42, so that the surface thereof is arranged along the plane direction (X-axis and Y-axis directions). It is the composition which becomes.

On the top portion of the wall portion 31, a sheet clamping unit 33 for mounting the reflection sheet 60 and the optical sheet 20 is formed, and the mounting surface of the sheet clamping unit 33 is on the first cabinet Ca side. A protruding convex portion 35 is formed. The sheet clamping unit 33 clamps the optical sheet 20 with the clamping piece 14 of the first cabinet Ca, and the convex portion 35 moves in the surface direction of the optical sheet 20 inside thereof. It is regulated. Moreover, the convex part 35 is accommodated in the convex part accommodating part 18 distribute | arranged to the back side (outside) of the nail | claw part 13 of 1st cabinet Ca as mentioned above, and the nail | claw part 13 is liquid crystal panel 11 from the back side (outside). It is biased to the side (inside).

The reflection sheet 60 is for reflecting light emitted from the hot cathode tube 50 to the inner surface of the second cabinet Cb. For example, the reflection sheet 60 is made of synthetic resin, and the surface thereof is white with excellent light reflectivity. . The reflection sheet 60 is laid along the inner surface of the second cabinet Cb so as to cover almost the entire area thereof. Specifically, a bottom portion 60A supported by the reflection sheet support plate 40 and an inclined portion 60B extending from the bottom portion 60A are provided. The inclined portion 60B is inclined so as to be directed to the front side at a predetermined angle with respect to the bottom surface 30, and the light reflected by the inclined portion 60B can be directed to the inner side (center side of the liquid crystal display device 10). It has become. Further, the peripheral edge of the reflection sheet 60 (a portion extending outward from the inclined portion 60 B) is placed on the sheet clamping unit 33.

As shown in FIGS. 2 and 5, the lamp clip 70 is made of, for example, a synthetic resin (polycarbonate or the like), and includes a plate portion 71 that contacts the front side of the reflection sheet 60 and a support pin 72 that supports the optical sheet 20. Similarly, the light source gripping part 74 that protrudes from the plate part 71 toward the optical sheet 20 and grips the hot cathode tube 50, and the latch that protrudes from the plate part 71 toward the support part 42 and attaches the lamp clip 70 to the support part 42. Part 73. A plurality of lamp clips 70 are arranged in the X-axis direction, for example, and support a plurality of intermediate portions other than both ends in the longitudinal direction of the hot cathode tube 50 from the back side, thereby deforming (bending) the hot cathode tube 50. It has a function to suppress Note that only one lamp clip 70 may be arranged in the X-axis direction with respect to one hot cathode tube 50. The entire surface of the lamp clip 70 has a color excellent in light reflectivity (for example, white).

The support pin 72 (sheet support member) has a substantially conical shape protruding from the plate portion 71 toward the optical sheet 20, and protrudes so that its tip abuts (or is close to) the back surface of the diffuser plate 22. . Thus, when the optical sheet 20 is bent, the optical sheet 20 is supported from the back side, thereby having a function of suppressing the bending of the diffusion plate 22.

A plurality of light source gripping portions 74 are arranged along the Y-axis direction (two locations in the present embodiment) on the plate portion 71, and a plurality of light source gripping portions 74 (two in the present embodiment) are provided for one lamp clip. ) Of the hot cathode tube 50 is attached. The light source grip 74 includes a columnar base 74A and a tip 74B. The front end portion 74B has an end-like annular shape in which a part of the front side is opened (opening portion 74D), and can be elastically deformed in the width direction (Y-axis direction). Further, the inner diameter of the tip 74B is set to be substantially the same as the outer diameter of the hot cathode tube 50, and the width of the opening 74D in the Y-axis direction is set to be smaller than the outer diameter of the hot cathode tube 50. Thus, the tip 74B surrounds a part of the peripheral surface of the hot cathode tube 50, and the hot cathode tube 50 can be attached and detached from the front side.

The locking portion 73 is inserted into a locking portion insertion hole 43A formed through the bottom wall 43 of the support portion 42 in the Z-axis direction, and a plurality of locations (in this embodiment, in the present embodiment). 2 places). The locking portion 73 includes a base portion 73A having a columnar shape with an outer shape smaller than the locking portion insertion hole 43A in a plan view, and a distal end portion 73B. The distal end portion 73B has a substantially V shape in which the width in the X-axis direction is set narrower toward the back side, and can be elastically deformed in the X-axis direction. Specifically, the width in the X-axis direction of the distal end portion 73B is set to be larger than the inner diameter of the locking portion insertion hole 43A at the front end portion, and the locking portion insertion hole 43A at the rear end portion. It is set smaller than the inner diameter.

In addition, an insertion hole 60 D is formed in the reflective sheet 60 at a location corresponding to the locking portion 73. Further, the reflection sheet support plate 40 is formed with an insertion hole 40 A at a location corresponding to the locking portion 73. Thereby, it has the structure which can penetrate the both

penetration holes

60D and 40A, and can insert the latching | locking part 73 in 43A of latching part insertion holes.

As described above, in the second cabinet Cb, the region between the bottom plate Cb1 and the reflection sheet support plate 40 is the substrate housing portion 90 that can accommodate the circuit board 80. An example of the substrate housing portion 90 is a region surrounded by four members of the bottom plate Cb1, the wall plate Cb2, the support portion 42, and the reflection sheet support plate 40 in the sectional view of FIG. Examples of the circuit board 80 include a power supply board (inverter board) for supplying driving power to the hot cathode tube 50, a video control board for controlling video in the television receiver TV, and the like.

Next, a method for assembling the liquid crystal display device 10 of this embodiment will be described. In the present embodiment, after assembling the first cabinet Ca and the second cabinet Cb individually, the liquid crystal display device 10 is assembled by assembling the first cabinet Ca and the second cabinet Cb.

The assembly of the first cabinet Ca is performed as follows. First, the liquid crystal panel 11 is attached to the first cabinet Ca. That is, the separately manufactured liquid crystal panel 11 is attached to the claw portion 13 of the first cabinet Ca, but here, as shown in FIG. 4, from the back side of the first cabinet Ca to the inclined surface 13 a of the claw portion 13. On the other hand, by pushing the liquid crystal panel 11 (arrow direction), the claw portion 13 is elastically deformed in the direction of expanding (outside) and is accommodated between the locking surface 13b and the elastic member 16. When the liquid crystal panel 11 is accommodated between the locking surface 13b and the elastic member 16, the claw portion 13 is elastically restored, thereby preventing the liquid crystal panel 11 from falling off between the locking surface 13b and the elastic member 16. Or suppressed. Thereby, the assembly of the first cabinet Ca is completed.

On the other hand, the assembly of the second cabinet Cb is performed as follows. First, the circuit board 80 is attached to the bottom plate Cb1 in the board accommodating portion 90 of the second cabinet Cb. Next, the reflection sheet support plate 40 is placed on the sheet placement surface 38 A and the support portion 42. As a result, the peripheral portion of the reflective sheet support plate 40 is supported by the sheet placement surface 38A, and a plurality of locations other than the peripheral portion are supported by the surface 42A of the support portion 42, and the reflective sheet support plate 40 has its planar direction in the X-axis direction. And arranged in a state of being matched with the Y-axis direction.

Next, the peripheral edge portion of the reflection sheet 60 is placed on the sheet sandwiching portion 33, and the bottom portion 60A of the reflection sheet 60 is placed on the reflection sheet support plate 40, respectively. As a result, almost the entire surface of the bottom 60A of the reflection sheet 60 is supported by the reflection sheet support plate 40, and bending or the like can be suppressed.

Next, the lamp clip 70 is attached to the support portion 42. Specifically, the locking portion 73 of the lamp clip 70 is inserted from the front side in the order of the insertion hole 60D of the reflection sheet 60, the insertion hole 40A of the reflection sheet support plate 40, and the locking portion insertion hole 43A of the support portion 42. . In the insertion process of the locking portion 73, the distal end portion 73B of the locking portion 73 is deformed by being reduced in diameter by being inserted into the locking portion insertion hole 43A, and is elastically restored when passing through the locking portion insertion hole 43A. As a result, the distal end portion 73B is locked to the hole edge of the locking portion insertion hole 43A from the back side.

Next, the hot cathode tube 50 is attached. Specifically, after the sockets 51 are respectively attached to the mounting portions 37 on both sides in the X-axis direction, both end portions of the hot cathode tube 50 are attached to the both attached sockets 51. In addition, after assembling the socket 51 and the hot cathode tube 50 in advance, the socket 51 may be mounted on the mounting portion 37.

Next, the hot cathode tube 50 is attached to the tip 74B of the light source grip 74 of the lamp clip 70. Specifically, when the hot cathode tube 50 is inserted into the opening 74D of the tip 74B, the tip 74B is elastically deformed and the width of the opening 74D in the Y-axis direction is widened. Then, when the hot cathode tube 50 passes through the opening 74D and reaches the inside of the tip portion 74B, the tip portion 74B is elastically restored. Thus, the hot cathode tube 50 is gripped by the periphery of the hot cathode tube 50 being surrounded by the tip end portion 74B.

Next, the optical sheet 20 is placed. Specifically, the optical sheet 20 is placed in an area surrounded by the convex portions 35, that is, on the sheet clamping portion 33. The assembly of the second cabinet Cb is completed by the above procedure.

Then, the first cabinet Ca and the second cabinet Cb, which have been assembled in the above-described procedure, are placed with their mounting surfaces 19 and 39 (shown in FIG. 3) facing each other, and the first cabinet Ca is convex. Assemble so that the convex part 35 is accommodated in the part accommodating part 18. With this assembly, the optical sheet 20 is sandwiched between the clamping piece 14 of the first cabinet Ca and the sheet clamping unit 33 of the second cabinet Cb. The liquid crystal display device 10 is completed by such engagement between the first cabinet Ca and the second cabinet Cb, and the television receiver TV is provided by supporting the liquid crystal display device 10 with the stand S (see FIG. 1).

As described above, according to the television receiver TV of the present embodiment, in the liquid crystal display device 10, the liquid crystal panel 11 is attached to the first cabinet Ca and the hot cathode tube 50 is attached to the second cabinet Cb. By engaging the cabinets Ca and Cb, the display function of the liquid crystal panel 11 using the light from the hot cathode tube 50 can be realized.

In addition, since the first cabinet Ca and the second cabinet Cb constitute an outer box that forms the appearance of the liquid crystal display device 10, the liquid crystal display device can be simply engaged with the first cabinet Ca and the second cabinet Cb. 10 can be used as a final product such as a television receiver TV. In particular, in this embodiment, since a mounting member such as a bezel is eliminated, material cost reduction is realized. Further, after assembling the liquid crystal panel and the backlight device as in the prior art, the number of assembling steps can be reduced by housing the liquid crystal panel and the backlight device in a separate cabinet as compared with the case where a final product such as a television receiver is provided. Therefore, cost reduction can also be realized in this respect.

Further, since the alignment of the liquid crystal panel 11 and the backlight device 12 is realized by the assembly of the first cabinet Ca and the second cabinet Cb, the workability is improved, and the alignment for the liquid crystal panel 11 is improved. There is no need to secure the area. Therefore, it is possible to easily perform alignment without causing a situation where the effective display area of the liquid crystal panel 11 becomes small.

Further, since the optical sheet 20 that diffuses the light from the hot cathode tube 50 is provided, the luminance on the light emitting surface of the backlight device 12 can be made uniform. Furthermore, since the optical sheet 20 can be supported by the support pins 72, it is possible to suppress the bending of the optical sheet 20, and it is possible to suppress luminance unevenness due to the bending.

Further, a support portion 42 is formed by protruding a part of the bottom plate Cb1 of the second cabinet Cb to the front side (optical sheet 20 side), and the lamp clip 70 (support pin 72) is attached to the support portion 42. With such a configuration, for example, compared to a configuration in which the lamp clip 70 is directly attached to the bottom plate Cb1 of the second cabinet Cb, the attachment location of the lamp clip 70 is arranged on the front side (the front side of the second cabinet Cb). Is done. For this reason, the attachment work at the time of attaching the lamp clip 70 from the front side (opening side) of the 2nd cabinet Cb becomes easy, and it also becomes possible to shorten the work time concerning attachment.

Further, a reflection sheet 60 and a reflection sheet support plate 40 capable of supporting the reflection sheet 60 are provided. According to such a configuration, the light from the hot cathode tube 50 can be reflected by the reflection sheet 60, and the luminance can be increased. By the way, since the support part 42 is formed in the second cabinet Cb in the present embodiment, the inner surface of the bottom plate Cb1 is not flush, but is uneven. When the reflection sheet 60 is attached to the surface on which the unevenness is formed, the reflection sheet 60 may be bent or floated, resulting in uneven brightness. Therefore, in the present embodiment, the reflection sheet support plate 40 that supports the reflection sheet 60 as described above is provided to suppress the occurrence of bending and floating in the reflection sheet 60.

Also, by arranging the reflection sheet support plate 40 in the support portion 42, a space is inevitably formed between the reflection sheet support plate 40 and the bottom plate Cb1. Therefore, the circuit board 80 is arranged in the space (the board housing part 90). For this reason, it is not necessary to provide a space for arranging the circuit board 80, and the second cabinet Cb and thus the liquid crystal display device 10 can be downsized.

Also, a cathode tube (hot cathode tube 50) is used as a light source. With such a configuration, for example, the size can be reduced as compared with a light source such as an incandescent lamp, and the luminance can be further increased.

Further, the first cabinet Ca and the second cabinet Cb are made of synthetic resin. With such a configuration, it is possible to reduce the weight and cost of the cabinet. Note that at least one of the first cabinet Ca and the second cabinet Cb may be made of synthetic resin.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the liquid crystal display device 110 (or the backlight device 112) according to the second embodiment, a configuration using an LED 120 (Light Emitting Diode) as a light source is different from that of the above-described embodiment. Further, the lamp clip 70 according to the above embodiment is eliminated, and the holding member 170 that holds the LED substrate 122 is provided. In the present embodiment, the same reference numerals are used for the parts having the same names as those in the first embodiment, and the description of the structure, action, and effect is omitted.

In the present embodiment, a plurality of LED substrates 122 on which a plurality of LEDs 120 are mounted are arranged on the surface of the reflection sheet support plate 140. The LED substrate 122 has a rectangular shape that is long in one direction in a plan view, and a plurality of LEDs 120 are mounted at equal intervals along the longitudinal direction. The LED substrates 122 are arranged so that the longitudinal direction thereof coincides with the X-axis direction, and are arranged at regular intervals in the Y-axis direction. Thereby, the plurality of LEDs 120 are arranged in a planar direction (two-dimensionally).

Each LED board 122 is configured to be positioned in the Y-axis direction by being fitted into each board mounting groove 140A formed in the reflection sheet support plate 140. As shown in FIG. 7, the substrate mounting groove 140A is formed by denting a part of the reflection sheet support plate 140 to the back side. The board mounting grooves 140A extend in the X-axis direction corresponding to the LED board 122, and are arranged in a plurality of rows in the Y-axis direction. Moreover, as shown in FIG. 6, the surface 140A of the reflective sheet support plate 140 and the surface 122A of the LED substrate 122 are flush with each other. Thereby, when the bottom portion 60A of the reflection sheet 60 is laid across both the surfaces 140A and 122A, the occurrence of bending and floating is suppressed.

The LED 120 emits white light by combining, for example, an LED chip that emits blue monochromatic light and a phosphor. For example, each LED 120 is electrically connected to a power supply board in the circuit board 80 and is configured to be supplied with drive power. Power consumption can be suppressed by using the LED 120 as the light source.

The holding member 170 is for holding the LED substrate 122 between the reflecting sheet support plate 140 and a plate portion 171 extending across both the LED substrates 122 in the Y-axis direction, and the optical sheet from the plate portion 171. And a support pin 72 that supports the optical sheet 20 and a locking portion 173 that protrudes from the plate portion 171 to the support portion 42 side and attaches the holding member 170 to the support portion 42.

In the plate portion 171, a protrusion 175 is formed at a location corresponding to the LED substrate 122 toward the back side. The protrusions 175 hold the LED board 122 by pressing the LED board 122 from the front side. An insertion hole 60 E is formed at a position corresponding to the LED 120 and the protrusion 175 in the bottom 60 A of the reflection sheet 60 so that the LED 120 and the protrusion 175 can be inserted. In the cross-sectional view of FIG. 6, cross sections cut at different locations in the X-axis direction are shown on both ends and the center side of the liquid crystal display device 110 in the Y-axis direction.

The locking portion 173 is formed in the plate portion 171 at a location facing the locking portion insertion hole 43A. The locking portion 173 includes a columnar base portion 173A and a tip portion 173B. The distal end portion 173B has a substantially trapezoidal shape in cross section, and can be elastically deformed in the direction of diameter reduction. As a result, the distal end portion 173B of the locking portion 173 is deformed in diameter when being inserted from the front side into the locking portion insertion hole 43A, and after passing through the locking portion insertion hole 43A, it is elastically returned to be locked. The distal end portion 173B of the portion is configured to be locked to the hole edge of the locking portion insertion hole 43A from the back side. In the present embodiment, the mounting portion 37 is also formed with a locking portion insertion hole 43A so that the locking portion 173 can be locked.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment, the configuration in which the support pin 72 is formed integrally with the lamp clip 70 and the holding member 170 is illustrated, but the present invention is not limited to this configuration. Only the support pin 72 may be attached to the support portion 42 alone.

(2) A configuration in which the support portion 42 is not provided may be employed. In the case of such a configuration, instead of the support portion 42, a configuration in which the support pins 72 are attached to the bottom plate Cb1 of the second cabinet Cb is also possible.

(3) In the above embodiment, the first cabinet Ca and the second cabinet Cb are made of synthetic resin, but are not limited thereto. For example, the first cabinet Ca and the second cabinet Cb may be made of metal. With such a configuration, the strength of the first cabinet Ca and the second cabinet Cb can be further increased. Further, by surrounding the circuit board 80 such as a power supply board with metal, electromagnetic wave noise from the circuit board 80 can be prevented from being radiated to the outside of the liquid crystal display device 10, and electromagnetic wave noise from the outside can be shielded. The operation reliability of the circuit board 80 can be further increased. Further, at least one of the first cabinet Ca and the second cabinet Cb may be made of metal.

(4) In the above-described embodiment, the reflective sheet support plate 40 is configured to be larger than the bottom 60A of the reflective sheet 60 in plan view, but is not limited to this configuration. The size of the reflection sheet support plate 40 can be changed as appropriate, and may be configured smaller than the bottom portion 60A. Moreover, the structure which distribute | arranges two or more reflective sheet support plates of the external shape smaller than bottom 60A may be sufficient by planar view.

(5) In the above embodiment, the reflective sheet support plate 40 is made of synthetic resin, but is not limited thereto. For example, the reflection sheet support plate 40 may be made of metal.

(6) In the above embodiment, the power supply board and the video control board are exemplified as the circuit board 80, but other circuit boards may be used, for example, a circuit board such as a tuner.

(7) In the above embodiment, the substrate accommodating portion 90 exemplifies a region surrounded by four surfaces (four members) of the bottom plate Cb1, the wall plate Cb2, the support portion 42, and the reflection sheet support plate 40. However, the present invention is not limited to this. The substrate housing portion 90 may be a space between the reflection sheet support plate 40 and the bottom plate Cb1, and the formation location and size thereof can be appropriately set according to the size and number of circuit boards 80. .

(8) In the above-described embodiment, the case where the hot cathode tube 50 is used as the light source has been described. However, the present invention includes one using another type of light source such as a cold cathode tube.

(9) In the above embodiment, the LED 120 including the blue light emitting LED chip and the phosphor is exemplified, but the present invention is not limited thereto. For example, the LED 120 may be configured to include an ultraviolet light emitting LED chip and a phosphor. Moreover, the structure provided with each of three types of LED chips which emit R (red), G (green), and B (blue) in a single color may be used. Moreover, the structure which combined three types of each LED which carries out monochromatic light emission of R (red), G (green), and B (blue) may be sufficient.

(10) The configuration of the optical sheet 20 may be a configuration other than the above embodiment, and can be changed as appropriate. Specifically, the number of diffusion plates 22 and the number and type of sheets 21 can be appropriately changed.

(11) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)). In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.

(12) In each of the above-described embodiments, the liquid crystal display device 10 using the liquid crystal panel 11 as the display element has been illustrated, but the present invention can also be applied to display devices using other types of display elements.

(13) In each of the above-described embodiments, the television receiver TV provided with the tuner is exemplified, but the present invention can also be applied to a display device that does not include the tuner.

DESCRIPTION OF SYMBOLS 10,110 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 20 ... Optical sheet, 40, 140 ... Reflective sheet support plate (reflective sheet support member), 42 ... Support part, 50 ... Hot cathode Tube (light source, cathode tube), 60 ... reflective sheet, 72 ... support pin (sheet support member), 80 ... circuit board (power supply board), 90 ... substrate housing portion, 120 ... LED (light source, light emitting diode), Ca ... 1st cabinet, Cb ... 2nd cabinet, Cb1 ... Bottom plate (bottom wall of 2nd cabinet), TV ... Television receiver

Claims

A light source;
A display panel that performs display using light of the light source;
A first cabinet to which the display panel is attached;
A second cabinet to which the light source is attached,
The first cabinet and the second cabinet are engaged with each other, and the first cabinet and the second cabinet constitute an outer box constituting the appearance of the display device,
An optical sheet that is disposed between the first cabinet and the second cabinet and diffuses light from the light source;
A display device comprising: a sheet support member attached to the second cabinet and supporting the optical sheet.
A support portion formed by protruding a part of the bottom wall of the second cabinet toward the optical sheet;
The display device according to claim 1, wherein the sheet support member is attached to the support portion.
A reflective sheet that reflects light from the light source toward the optical sheet;
The display device according to claim 2, further comprising: a flat reflection sheet support member supported by the support portion and capable of supporting the reflection sheet.
A power supply board for supplying power to the light source;
The display device according to claim 3, wherein the power supply substrate is disposed in a substrate housing portion formed between the reflection sheet support member and the bottom wall in the second cabinet. .
The display device according to any one of claims 1 to 4, wherein the light source is a cathode tube.
The display device according to any one of claims 1 to 4, wherein the light source is a light emitting diode.
The display device according to any one of claims 1 to 6, wherein at least one of the first cabinet and the second cabinet is made of synthetic resin.
The display device according to any one of claims 1 to 6, wherein at least one of the first cabinet and the second cabinet is made of metal.
The display device according to any one of claims 1 to 8, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to any one of claims 1 to 9.