WO2013054781A1 - Display device and television reception device - Google Patents

Abstract

A liquid crystal display device (10) comprises: an LED (17); a liquid crystal panel (11); a light guide plate (16) disposed so as to overlap on the side of the liquid crystal panel (11) opposite from a display surface (11c), and disposed so that an end surface thereof is disposed facing the LED (17) and an end side portion (16EP) is disposed further to the outside than an end part of the liquid crystal panel (11); an optical member (15) disposed so as to be sandwiched between the liquid crystal panel (11) and the light guide plate (16), and arranged such that an end side portion (15EP) thereof overlaps with the end side portion (16EP) of the light guide plate (16); a holding member (HM) having a chassis (14) and a frame (13) for holding the liquid crystal panel (11) and the light guide plate (16) in enclosing fashion from the display surface (11c) side and the opposite side thereof; and a light guide plate supporting part (23) which protrudes toward the light guide plate (16) from the frame (13) and supports the end side portion (16EP) of the light guide plate (16) from the display surface (11c) side, the light guide plate supporting part (23) being formed by cutting out a portion from an optical member accommodating recess (28) for accommodating the end part of the optical member (15).

Description

Display device and television receiver

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

In recent years, the display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display panels such as liquid crystal panels and plasma display panels, which enables thinning of image display devices. Since the liquid crystal panel used for the liquid crystal display device does not emit light by itself, a backlight device is separately required as a lighting device, and the backlight device is roughly classified into a direct type and an edge light type according to the mechanism. In order to further reduce the thickness of the liquid crystal display device, it is preferable to use an edge light type backlight device, and an example described in Patent Document 1 below is known.

JP 2002-174811 A

(Problems to be solved by the invention)
The liquid crystal display device described in Patent Document 1 employs a structure in which a liquid crystal panel is sandwiched between a front panel pressing member and a back panel receiving member. Here, when there is a request for reduction in manufacturing cost or further reduction in thickness, for example, it is conceivable to eliminate the panel receiving member on the back side. However, since this panel receiving member has a function of supporting the end of the liquid crystal panel from the back side and blocking the light from the back side from entering the end of the liquid crystal panel, it is simply a panel receiving member. If this is abolished, there is a concern that light from the back side enters the end of the liquid crystal panel and light leakage occurs. In particular, in the configuration in which the end side portion of the light guide plate is arranged outside the end portion of the liquid crystal panel, the light emitted from the end side portion of the light guide plate is directly incident on the end portion of the liquid crystal panel. The problem was leakage.

The present invention has been completed based on the above situation, and an object thereof is to suppress the occurrence of light leakage.

(Means for solving the problem)
The display device of the present invention is disposed so as to overlap a light source, a display panel that performs display using light of the light source, and a side opposite to the display surface side of the display panel, and an end surface of the display device A light guide plate disposed opposite to the light source and having an end portion disposed outside the end portion of the display panel, and disposed between the display panel and the light guide plate. An optical member having an end portion overlapped with the end portion of the light guide plate, and a pair of holding portions for holding the display panel and the light guide plate in a form sandwiched from the display surface side and the opposite side. A holding member configured to house the light source between the pair of holding parts, and the holding part disposed on the display surface side of the pair of holding parts and projecting to the light guide plate side. The end portion of the light guide plate is the display surface side. A light guide plate support portion for al supporting, and a light guide plate supporting portion formed by is cutout forming optical member accommodating recess for accommodating the end portion of the optical member.

In this way, the light emitted from the light source enters the end face of the light guide plate and then is guided to the display panel while being given a predetermined optical action through the optical member. An image is displayed on the display panel. As for the light guide plate, the end side portion arranged outside the end portion of the display panel is supported from the display surface side by the light guide plate support portion, so that the shape of the light guide plate can be maintained and the position can be stabilized. By the way, the display panel, the optical member, and the light guide plate are held in a form sandwiched from the display surface side and the opposite side by a pair of holding portions of the holding member in a state of being arranged so as to overlap each other. As described above, since the panel receiving member is not interposed between the light guide plate and the optical member and the display panel, there is a concern that light leaks to the end of the display panel. However, the light guide plate supporting portion that supports the end portion of the light guide plate is formed with a cut-out optical member receiving recess for receiving the end portion of the optical member, so that the end portion of the optical member becomes the end of the light guide plate. Since the side portion is arranged so as to overlap with the range from the end portion of the display panel to the inside of the optical member receiving recess of the light guide plate support portion when viewed from the display surface side, the light emitted from the end side portion of the light guide plate The light can be reliably incident on the end portion of the optical member, and the light can be prevented from directly entering the end of the display panel. Thereby, the light leak to the edge part of a display panel can be suppressed. In addition, since the optical member is used to suppress light leakage as described above, the number of parts is smaller than that in the case where light reflection is suppressed by newly adding a reflector or the like. Since it can respond without an increase, it is suitable for reducing costs.

The following configuration is preferable as an embodiment of the present invention.
(1) A clearance is provided between the inner surface of the optical member housing recess and the end surface of the optical member. In this way, even when thermal expansion occurs in the optical member due to a change in the temperature environment, there is a clearance between the inner surface of the optical member housing recess and the end surface of the optical member. It can be allowed to stretch with thermal expansion. As a result, deformation such as bending or wrinkle is less likely to occur in the optical member, and hence unevenness is less likely to occur in the light transmitted through the optical member, thereby improving the display quality. Further, even if light is emitted from the end side portion of the light guide plate toward the clearance, the light hits the inner surface of the optical member housing recess, so that it is difficult to enter the end portion of the display panel.

(2) A clearance is provided between the inner surface of the optical member housing recess and the surface on the display surface side at the end of the optical member. In this case, it is difficult to apply a pressing force to the end portion of the optical member from the inner surface of the optical member housing recess, and therefore it becomes easier to expand and contract when thermal expansion or contraction occurs in the optical member. Thereby, deformation such as bending or wrinkle is less likely to occur in the optical member, and the display quality is excellent.

(3) The light guide plate support portion is disposed so as to support a portion of the end portion of the light guide plate facing the light source and interposed between the light source and the end portion of the display panel. Yes. In this way, the light that enters directly from the light source to the end of the display panel can be blocked by the light guide plate support that is disposed between the light source and the end of the display panel. The occurrence of light leakage can be further suppressed. In addition, by supporting the portion of the end portion of the light guide plate that faces the light source by the light guide plate support portion, the positional relationship of the light guide plate with respect to the light source can be stabilized, whereby light incident on the end surface of the light guide plate The incident efficiency can be stabilized.

(4) A plurality of the optical members are arranged so as to be stacked on each other, and each of the plurality of optical members is housed in the optical member housing recess. In this way, each end of the plurality of optical members stacked on each other is housed in the optical member housing recess, so that the light emitted from the end side portion of the light guide plate is directed to the end side portions of the plurality of optical members. It can be made incident. Thereby, the light emitted from the end side portion of the light guide plate is less likely to be directly incident on the end portion of the display panel, which is suitable for suppressing light leakage.

(5) An optical member support surface capable of supporting the display surface side surface at the end of the optical member is provided on the inner surface of the optical member housing recess. In this way, the display surface side surface at the end of the optical member can be supported by the optical member support surface, so that the shape and the position of the optical member can be maintained. The optical function can be appropriately exhibited.

(6) The light guide plate support portion is configured to extend along the side of the end portion of the optical member, and the optical member housing recess is formed to accommodate the end portion of the optical member over the entire length. Has been. In this way, since the end portion of the optical member is accommodated in the optical member accommodating recess over the entire length, the light emitted from the end side portion along the side of the end portion of the optical member of the light guide plate is not leaked to the optical member Therefore, the occurrence of light leakage can be more suitably suppressed.

(7) The light guide plate support portion is formed in a frame shape so as to support the end side portion of the light guide plate over the entire periphery, and the optical member storage recess stores the outer peripheral end portion of the optical member over the entire periphery. It is formed to do. In this way, since the end portion of the light guide plate can be supported over the entire circumference by the light guide plate support portion formed in a frame shape, it is more preferable to maintain the shape and stabilize the position of the light guide plate. Therefore, the display quality can be improved. Moreover, since the outer peripheral end of the optical member is accommodated in the optical member accommodating recess over the entire circumference, the light emitted from the end side portion of the light guide plate can be incident on the end side portion of the optical member over the entire circumference. The occurrence of light leakage can be prevented more reliably.

(8) A light blocking portion that blocks light emitted from the end side portion of the light guide plate is formed on the end side portion of the optical member. In this way, since the light emitted from the end portion of the light guide plate can be blocked by the light blocking portion formed on the end portion of the optical member, light leakage to the end portion of the display panel can be prevented more reliably. Can do.

(9) The plurality of optical members are arranged in a stacked manner, and the light shielding portion is selectively formed on the optical member arranged closest to the light guide plate among the plurality of optical members. ing. If it does in this way, incidence of light to other optical members can be blocked by selectively forming a light shielding part in the optical member most arranged on the light guide plate side. Since the light shielding part is not formed on the optical member other than the optical member arranged closest to the light guide plate, the cost required to form the light shielding part can be minimized.

(10) The light shielding portion is disposed between at least a portion of the optical member that is accommodated in the optical member accommodating recess and the light guide plate support portion and an end surface of the display panel as viewed from the display surface side. It is formed in a range that spans the part. In this way, light emitted from the end portion of the light guide plate can be more reliably blocked by the light blocking portion, so that light leakage to the end portion of the display panel can be more reliably prevented.

(11) The light guide plate support portion is formed so that the optical member housing recess opens toward the light guide plate side. If it does in this way, the operation | work which accommodates the edge part of an optical member in an optical member accommodation recessed part at the time of an assembly | attachment can be performed easily, and it is excellent in assembly workability | operativity.

(12) The light guide plate support portion has a bottom portion interposed between the end portion of the optical member housed in the optical member housing recess and the light guide plate. If it does in this way, it can block that light enters into an end of an optical member stored in an optical member storage crevice from an end side portion of a light guide plate by a bottom. Thereby, since the amount of incident light from the end side portion of the light guide plate to the end side portion of the optical member is reduced, it is possible to further suppress the incidence of light to the end portion of the display panel. And since the support area with respect to the light guide plate in a light guide plate support part is expanded by the bottom part, a light guide plate can be supported more stably.

(13) Whereas a plurality of the optical members are arranged so as to be stacked on each other, the light guide plate support portion has an inclined inner surface of the bottom portion and a plurality of the optical members in the optical member receiving recess. Each end of the member is formed to be received. If it does in this way, each edge part of a some optical member can be accommodated in an optical member accommodation recessed part by making the inner surface of a bottom part into inclined shape. This allows light emitted from the end portion of the light guide plate to be incident on a plurality of optical members, so that light emitted from the end portion of the light guide plate is less likely to be directly incident on the end portion of the display panel. It is suitable for suppressing light leakage.

(The invention's effect)
According to the present invention, it is possible to suppress light leakage.

1 is an exploded perspective view showing a schematic configuration of a television receiver and a liquid crystal display device according to Embodiment 1 of the present invention. Rear view of television receiver and liquid crystal display Exploded perspective view showing a schematic configuration of a liquid crystal display unit constituting a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device The expanded sectional view which shows the section composition along the direction of the short side of a liquid crystal display, and cut the flexible substrate (screw fastening hole for co-fastening) The expanded sectional view which shows the cross-sectional structure along the short side direction of a liquid crystal display device, and cut | disconnected the light-guide plate support part (screw penetration hole for heat radiating members) Enlarged sectional view of FIG. Rear view of frame Enlarged rear view near the corner of the frame Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device, and shows the operation | work procedure which assembles each component of the liquid crystal display unit which makes a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device, Comprising: The operation | work procedure which assembles each component of the liquid crystal display unit which makes a liquid crystal display device Sectional drawing which shows the cross-sectional structure of the light-guide plate support part and optical member which concern on Embodiment 2 of this invention. Sectional drawing which shows the cross-sectional structure of the light-guide plate support part and optical member which concern on Embodiment 3 of this invention. Rear view of optical member arranged closest to light guide plate Sectional drawing which shows the cross-sectional structure of the light-guide plate support part and optical member which concern on Embodiment 4 of this invention. Sectional drawing which shows the cross-sectional structure of the light-guide plate support part and optical member which concern on Embodiment 5 of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Moreover, let the upper side shown in FIG. 4 be a front side, and let the lower side of the figure be a back side.

As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display unit (display unit) LDU, and various substrates PWB, MB, and CTB attached to the back side (back side) of the liquid crystal display unit LDU. The liquid crystal display unit LDU includes a cover member CV attached to the back surface side of the liquid crystal display unit LDU so as to cover the various substrates PWB, MB, and CTB, and a stand ST. Axial direction) is supported. The liquid crystal display device 10 according to the present embodiment is obtained by removing at least a configuration for receiving a television signal (such as a tuner portion of the main board MB) from the television receiver TV having the above-described configuration. As shown in FIG. 3, the liquid crystal display unit LDU has a horizontally long rectangular shape (rectangular shape, longitudinal shape) as a whole, and includes a liquid crystal panel 11 as a display panel and a backlight device (illumination device) as an external light source. ) 12, and these are external members constituting the external appearance of the liquid crystal display device 10, which are opposite to the frame (the holding portion disposed on the display surface 11 c side, one holding portion) 13 and the chassis (the display surface 11 c side). The holding portion disposed on the side and the other holding portion) 14 are integrally held. It can be said that the frame 13 and the chassis 14 constitute a holding member HM. Note that the chassis 14 according to the present embodiment constitutes a part of the appearance member and the holding member HM and a part of the backlight device 12.

First, the configuration of the back side of the liquid crystal display device 10 will be described. As shown in FIG. 2, the stand mounting member STA extending along the Y-axis direction is provided at two positions spaced apart in the X-axis direction on the back surface of the chassis 14 constituting the back side appearance of the liquid crystal display device 10. A pair is attached. These stand attachment members STA have a substantially channel shape in which the cross-sectional shape is open on the surface on the chassis 14 side, and a pair of support columns STb in the stand ST are inserted into a space held between the stand 14 and the chassis 14. It has become. Note that a wiring member (such as an electric wire) connected to the LED substrate 18 of the backlight device 12 can be passed through the space in the stand attachment member STA. The stand ST includes a pedestal part STa that is parallel to the X-axis direction and the Z-axis direction, and a pair of column parts STb that rise from the pedestal part STa along the Y-axis direction. The cover member CV is made of synthetic resin, and covers a part of the back surface of the chassis 14, specifically about the lower half of FIG. 2 while traversing the pair of stand mounting members STA in the X-axis direction. It is attached in the form. Between the cover member CV and the chassis 14, there is a component storage space that can store components such as various substrates PWB, MB, and CTB described below.

As shown in FIG. 2, the various substrates PWB, MB, and CTB include a power supply substrate PWB, a main substrate MB, and a control substrate CTB. The power supply substrate PWB can be said to be a power supply source of the liquid crystal display device 10 and can supply driving power to the other substrates MB and CTB, the LEDs 17 included in the backlight device 12, and the like. Therefore, it can be said that the power supply substrate PWB also serves as the “LED drive substrate (light source drive substrate) for driving the LED 17”. The main board MB includes at least a tuner unit capable of receiving a television signal and an image processing unit (not shown) for processing the received television signal. The processed image signal is described below. Output to the control board CTB is possible. The main board MB receives an image signal from the image reproduction device when the liquid crystal display device 10 is connected to an external image reproduction device (not shown). It can be processed and output to the control board CTB. The control board CTB has a function of converting an image signal input from the main board MB into a liquid crystal driving signal and supplying the converted liquid crystal driving signal to the liquid crystal panel 11.

As shown in FIG. 3, the liquid crystal display unit LDU that constitutes the liquid crystal display device 10 has a main component that includes a frame (front frame) 13 that forms a front side appearance and a chassis (rear side) that forms a back side appearance. It is assumed that it is accommodated in a space held between the chassis 14 and the chassis 14. The main components housed in the frame 13 and the chassis 14 include at least the liquid crystal panel 11, the optical member 15, the light guide plate 16, and the LED unit (light source unit) LU. Among these, the liquid crystal panel 11, the optical member 15, and the light guide plate 16 are held in a state of being sandwiched between the front frame 13 and the back chassis 14 in a state where they are stacked on each other. The backlight device 12 includes an optical member 15, a light guide plate 16, an LED unit LU, and a chassis 14, and is configured by removing the liquid crystal panel 11 and the frame 13 from the liquid crystal display unit LDU. The LED unit LU that constitutes the backlight device 12 includes a pair of light guide plates 16 that are paired in the frame 13 and the chassis 14 so as to sandwich the light guide plate 16 from both sides in the short side direction (Y-axis direction). Two sets are arranged side by side in the side direction (X-axis direction), and a total of four are installed. The LED unit LU includes an LED 17 that is a light source, an LED substrate (light source substrate) 18 on which the LED 17 is mounted, and a heat radiating member (heat spreader, light source mounting member) 19 to which the LED substrate 18 is attached. Hereinafter, each component will be described.

As shown in FIG. 3, the liquid crystal panel 11 has a horizontally long rectangular shape (rectangular shape, longitudinal shape) in a plan view, and a pair of glass substrates 11a and 11b having excellent translucency are provided with a predetermined gap. The liquid crystal is sealed between the two substrates 11a and 11b. The front side (front side) of the pair of substrates 11a and 11b is the CF substrate 11a, and the back side (back side) is the array substrate 11b. Among these, the array substrate 11b is provided with a switching element (for example, TFT) connected to the source wiring and the gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. . On the other hand, the CF substrate 11a is provided with a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, a counter electrode, and an alignment film. . A polarizing plate (not shown) is disposed outside each of the substrates 11a and 11b.

Of the pair of substrates 11a and 11b constituting the liquid crystal panel 11, the array substrate 11b is formed to have a larger size in plan view than the CF substrate 11a, as shown in FIGS. The portions are arranged so as to protrude outward from the CF substrate 11a. Specifically, the array substrate 11b is formed to be slightly larger than the CF substrate 11a so that its outer peripheral end protrudes outside the outer peripheral end of the CF substrate 11a over the entire periphery. Of the pair of long side end portions in the array substrate 11b, the long side end portion (left end portion shown in FIG. 4) on the control substrate CTB side in the Y-axis direction is routed from the gate wiring and source wiring described above. As shown in FIGS. 2 and 4, a flexible substrate (FPC substrate) 26 on which a driver DR for driving liquid crystal is mounted is connected to each of these terminal portions. Yes. A plurality of flexible substrates 26 are intermittently arranged in the X-axis direction, that is, the direction along the long-side end of the array substrate 11b, and extend from the long-side end of the array substrate 11b along the Y-axis direction. Extending outwards. The flexible substrate 26 includes a film-like base material made of a synthetic resin material (for example, polyimide resin) having insulating properties and flexibility, and has a large number of wiring patterns (not shown) on the base material. At the same time, the wiring pattern is connected to a driver DR mounted near the center of the substrate. One end of the flexible substrate 26 is connected to a terminal portion of the array substrate 11b, and the other end is connected to a terminal portion of a printed circuit board 27 described later via an anisotropic conductive film (ACF). Crimp connected. The printed board 27 is connected to the control board CTB via a wiring member (not shown), and a signal input from the control board CTB can be transmitted to the flexible board 26. Thereby, the liquid crystal panel 11 displays an image on the display surface 11c based on a signal input from the control board CTB.

As shown in FIGS. 4 and 5, the liquid crystal panel 11 is placed on the front side (light emitting side) of the optical member 15 described below, and the back side surface (the outer surface of the back side polarizing plate). ) Is in close contact with the optical member 15 with almost no gap. This prevents dust and the like from entering between the liquid crystal panel 11 and the optical member 15. The display surface 11c of the liquid crystal panel 11 is composed of a display area that can display an image on the center side of the screen and a non-display area that forms a frame shape (frame shape) that surrounds the display area on the outer peripheral edge side of the screen. Become. The terminal portion and the flexible substrate 26 described above are arranged in the non-display area.

As shown in FIG. 3, the optical member 15 is made of synthetic resin and has a horizontally long rectangular shape as viewed from the plane, like the liquid crystal panel 11, and has a size (short side dimension and (Side dimension) is larger than that of the liquid crystal panel 11, and the end portion 15 EP is arranged so as to protrude outward from the end portion of the liquid crystal panel 11. Specifically, as shown in FIGS. 4 and 5, the optical member 15 has an end side portion 15EP that protrudes further outward than the outer peripheral end portion of the array substrate 11b that forms the outer shape of the liquid crystal panel 11 over the entire circumference. It is slightly larger than the array substrate 11b. The optical member 15 is placed so as to be laminated on the front side (the liquid crystal panel 11 side, the light emitting side) of the light guide plate 16 described below, and is sandwiched between the liquid crystal panel 11 and the light guide plate 16 described above. It is arranged with. Each of the optical members 15 is formed in a sheet shape and three are stacked on each other. Specifically, the optical member 15 includes a diffusion sheet 15a, a lens sheet (prism sheet) 15b, and a reflective polarizing sheet 15c in order from the back side (light guide plate 16 side). Note that the three sheets 15a, 15b, and 15c have substantially the same size in a plan view.

Among them, the diffusion sheet 15a arranged on the backmost side (light guide plate 16 side) is made of a synthetic resin that is almost transparent (excellent in light transmission) and is provided with a large number of diffusion particles dispersed in a sheet-like base material. And has a function of diffusing transmitted light. The lens sheet 15b disposed in the center in the stacking direction (Z-axis direction) is made of a substantially transparent synthetic resin sheet-like base material and a prism layer formed by being stacked on the plate surface of the base material. Therefore, it is possible to give a condensing effect to the transmitted light. The reflective polarizing sheet 15c arranged on the most front side (the liquid crystal panel 11 side) has, for example, a multilayer structure in which layers having different refractive indexes are alternately stacked, and p-waves of light from the light guide plate 16 are transmitted. The s-wave is transmitted and reflected to the light guide plate 16 side. The s wave returned to the light guide plate 16 side is reflected to the front side by a light guide reflection sheet 20 and the like which will be described later, so that it is separated into s wave and p wave, and then is emitted toward the reflective polarizing sheet 15c again. Therefore, it is excellent in light use efficiency (luminance).

The light guide plate 16 is made of a synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate) having a refractive index sufficiently higher than air and substantially transparent (excellent translucency). As shown in FIG. 3, the light guide plate 16 has a horizontally long rectangular shape when viewed in a plan view, as in the liquid crystal panel 11 and the optical member 15, and has a plate shape that is thicker than the optical member 15. The long side direction on the surface coincides with the X-axis direction, the short side direction coincides with the Y-axis direction, and the plate thickness direction orthogonal to the main surface coincides with the Z-axis direction. As shown in FIGS. 4 and 5, the light guide plate 16 has a size (short side dimension and long side dimension) as viewed in a plane larger than that of the liquid crystal panel 11, and an end portion 16EP thereof. Are arranged so as to protrude outward from the end of the liquid crystal panel 11. Specifically, the end portion 16EP of the light guide plate 16 protrudes outward from the outer peripheral end portion of the array substrate 11b of the liquid crystal panel 11 over the entire periphery, and further outside the outer peripheral end portion of the optical member 15 thereon. It is formed to be slightly larger than the optical member 15 so as to protrude. The light guide plate 16 is laminated on the back side of the optical member 15 and is disposed so as to be sandwiched between the optical member 15 and the chassis 14. The light guide plate 16 is arranged in such a way that it is sandwiched in the Y-axis direction by a pair of LED units LU arranged separately on both sides in the short side direction. Each light is introduced. The light guide plate 16 has a function of rising and emitting the light from the LED 17 introduced from both ends in the short side direction so as to be directed toward the optical member 15 (front side) while propagating inside. By the way, the reason why the light guide plate 16 is made larger than the liquid crystal panel 11 and the optical member 15 as described above (the reason for securing the end-side portion 16EP) is that the distance for propagating the light incident from the LED 17 is sufficient. The end side portion 16EP of the light guide plate 16 is more likely to cause unevenness in the emitted light than the central side portion, and this end side portion 16EP is more likely to cause unevenness in the emitted light. This is also because the display quality is not good when the light emitted from is used for image display.

Of the main surface of the light guide plate 16, the surface facing the front side (the surface facing the optical member 15) emits light from the inside toward the optical member 15 and the liquid crystal panel 11, as shown in FIG. It becomes the output surface 16a. Of the outer peripheral end faces adjacent to the main surface of the light guide plate 16, both end faces on the long side that are long along the X-axis direction (both end faces that the both ends in the short side direction have) are LEDs 17 ( The LED board 18) and the LED board 18) are opposed to each other with a predetermined space therebetween, and these form a pair of light incident surfaces 16b on which light emitted from the LEDs 17 is incident. The light incident surface 16b is a surface parallel to the X-axis direction and the Z-axis direction (the main plate surface of the LED substrate 18), and is a surface substantially orthogonal to the light emitting surface 16a. Further, the alignment direction of the LED 17 and the light incident surface 16b coincides with the Y-axis direction and is parallel to the light emitting surface 16a.

On the back side of the light guide plate 16, that is, the surface opposite to the light emitting surface 16a (the surface facing the chassis 14) 16c, as shown in FIGS. A light guide reflection sheet (reflection member) 20 that can be reflected and raised to the front side is provided so as to cover almost the entire area. In other words, the light guide reflection sheet 20 is disposed so as to be sandwiched between the chassis 14 and the light guide plate 16. The light guide reflection sheet 20 is made of a synthetic resin and has a white surface with excellent light reflectivity. As shown in FIG. 4, at least the short side dimension of the light guide reflection sheet 20 is larger than the short side dimension of the light guide plate 16, and both ends thereof are closer to the LED 17 than the light incident surface 16 b of the light guide plate 16. It is arranged to stick out. Light that travels obliquely from the LED 17 toward the chassis 14 side is efficiently reflected by the projecting portions (both ends on the long side) of the light guide reflection sheet 20 and directed toward the light incident surface 16 b of the light guide plate 16. It is possible to make it. It should be noted that at least one of the light exit surface 16a and the opposite surface 16c of the light guide plate 16 has a reflection part (not shown) for reflecting internal light or a scattering part (not shown) for scattering internal light. Are patterned so as to have a predetermined in-plane distribution, whereby the light emitted from the light exit surface 16a is controlled to have a uniform distribution in the surface.

Next, the configuration of the LED 17, the LED substrate 18, and the heat radiating member 19 constituting the LED unit LU will be sequentially described. As shown in FIGS. 3 and 4, the LED 17 constituting the LED unit LU has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 18. The LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used. On the other hand, the resin material that seals the LED chip is dispersed and blended with a phosphor that emits a predetermined color when excited by the blue light emitted from the LED chip, and generally emits white light as a whole. It is said. In addition, as the phosphor, for example, a yellow phosphor that emits yellow light, a green phosphor that emits green light, and a red phosphor that emits red light are used in appropriate combination, or any one of them is used. It can be used alone. The LED 17 is a so-called top surface light emitting type in which the surface opposite to the mounting surface with respect to the LED substrate 18 (the surface facing the light incident surface 16b of the light guide plate 16) is the main light emitting surface 17a.

As shown in FIGS. 3 and 4, the LED substrate 18 constituting the LED unit LU is an elongated plate shape extending along the long side direction of the light guide plate 16 (X-axis direction, longitudinal direction of the light incident surface 16 b). The main surface is accommodated in the frame 13 and the chassis 14 in a posture parallel to the X-axis direction and the Z-axis direction, that is, a posture parallel to the light incident surface 16b of the light guide plate 16. The LED substrate 18 has a length dimension that is approximately half of the long side dimension of the light guide plate 16. The LED 17 having the above-described configuration is surface-mounted on the inner surface, that is, the surface facing the light guide plate 16 side (the surface facing the light guide plate 16), which is the main surface of the LED substrate 18, and this is the mounting surface 18a. Is done. A plurality of LEDs 17 are arranged in a line (linearly) in parallel on the mounting surface 18a of the LED substrate 18 along the length direction (X-axis direction) with a predetermined interval. That is, it can be said that a plurality of LEDs 17 are intermittently arranged in parallel along the long side direction at both ends on the long side of the backlight device 12. The interval between the LEDs 17 adjacent to each other in the X-axis direction, that is, the arrangement pitch of the LEDs 17 is substantially equal. Note that the arrangement direction of the LEDs 17 coincides with the length direction (X-axis direction) of the LED substrate 18. On the mounting surface 18a of the LED substrate 18, a wiring pattern (not shown) made of a metal film (such as a copper foil) that extends along the X-axis direction and connects the adjacent LEDs 17 across the LED 17 group in series. The terminal portions formed at both ends of the wiring pattern are connected to the power supply substrate PWB via wiring members such as connectors and electric wires, so that driving power is supplied to each LED 17. It has become. The LED boards 18 that are paired with the light guide plate 16 in between are housed in the frame 13 and the chassis 14 with the mounting surfaces 18a of the LEDs 17 facing each other, and are thus mounted on the paired LED boards 18 respectively. The main light emitting surfaces 17a of the LEDs 17 are opposed to each other, and the optical axes of the LEDs 17 substantially coincide with the Y-axis direction. Moreover, the base material of the LED board 18 is made of metal such as aluminum, for example, and the wiring pattern (not shown) described above is formed on the surface thereof via an insulating layer. In addition, as a material used for the base material of LED board 18, insulating materials, such as a ceramic, can also be used.

The heat dissipating member 19 constituting the LED unit LU is made of a metal having excellent thermal conductivity such as aluminum as shown in FIGS. 3 and 4. The heat dissipating member 19 includes an LED attachment portion (light source attachment portion) 19a to which the LED substrate 18 is attached, and a heat dissipating portion 19b in surface contact with the plate surface of the chassis 14, and these have a bent shape having a substantially L-shaped cross section. There is no. The length of the heat dissipation member 19 is approximately the same as the length of the LED substrate 18 described above. The LED mounting portion 19a constituting the heat radiating member 19 has a plate shape parallel to the plate surface of the LED substrate 18 and the light incident surface 16b of the light guide plate 16, and the long side direction is the X-axis direction and the short side direction. Are coincident with the Z-axis direction and the thickness direction is coincident with the Y-axis direction. The LED board 18 is attached to the inner plate surface of the LED mounting portion 19a, that is, the plate surface facing the light guide plate 16 side. The LED mounting portion 19 a has a long side dimension substantially equal to the long side dimension of the LED substrate 18, but the short side dimension is larger than the short side dimension of the LED substrate 18. In addition, both end portions in the short side direction of the LED mounting portion 19a protrude outward from the both end portions of the LED substrate 18 along the Z-axis direction. An outer plate surface of the LED mounting portion 19a, that is, a plate surface opposite to the plate surface on which the LED substrate 18 is mounted is opposed to a screw mounting portion (fixing member mounting portion) 21 included in the frame 13 described later. ing. That is, the LED attachment portion 19 a is arranged in a form that is interposed between the screw attachment portion 21 of the frame 13 and the light guide plate 16. The LED mounting portion 19a extends in the Z-axis direction (the overlapping direction of the liquid crystal panel 11, the optical member 15, and the light guide plate 16) from the inner end of the heat radiating portion 19b described below, that is, the end on the LED 17 (light guide plate 16) side. Along the front side, that is, the frame 13 side.

As shown in FIGS. 3 and 4, the heat radiating portion 19 b has a plate shape parallel to the plate surface of the chassis 14, and the long side direction is the X-axis direction and the short side direction is the Y-axis direction. The vertical direction coincides with the Z-axis direction. The heat dissipating part 19b protrudes from the end on the back side of the LED mounting part 19a, that is, from the end on the chassis 14 side to the outside along the Y-axis direction, that is, toward the side opposite to the light guide plate 16 side. . The long side dimension of the heat dissipating part 19b is substantially the same as that of the LED mounting part 19a. Of the heat radiating portion 19 b, the entire plate surface on the back side, that is, the plate surface facing the chassis 14 side, is in surface contact with the plate surface of the chassis 14. In addition, the front plate surface of the heat radiating portion 19b, that is, the plate surface opposite to the contact surface with respect to the chassis 14 is opposed to a screw mounting portion 21 included in the frame 13 to be described later, and It is in contact with the protruding end surface. That is, the heat dissipating part 19b is arranged in such a manner as to be sandwiched (intervened) between the screw attaching part 21 of the frame 13 and the chassis 14. As a result, the heat generated from the LED 17 when it is turned on is transmitted to the frame 13 having the chassis 14 and the screw mounting portion 21 via the LED substrate 18, the LED mounting portion 19a, and the heat radiating portion 19b. It is efficiently dissipated to the outside of the display device 10 and it is difficult to stay inside. The heat dissipating part 19b is held in an attached state by a screw member (fixing member) SM with respect to the screw attaching part 21, and has an insertion hole 19b1 for passing the screw member SM. Yes.

Subsequently, the configuration of the frame 13 and the chassis 14 that form the appearance member and the holding member HM will be described. Both the frame 13 and the chassis 14 are made of metal such as aluminum, for example, and mechanical strength (rigidity) and thermal conductivity are both higher than when the frame 13 and the chassis 14 are made of synthetic resin. As shown in FIG. 3, the frame 13 and the chassis 14 are stacked on each other while accommodating the LED units LU paired at both ends (both ends on both long sides) in the short side direction. The liquid crystal panel 11, the optical member 15, and the light guide plate 16 are held so as to be sandwiched between the front side and the back side.

As shown in FIG. 3, the frame 13 has a horizontally long frame shape as a whole so as to surround the display area on the display surface 11 c of the liquid crystal panel 11. The frame 13 includes a panel pressing portion 13a that is parallel to the display surface 11c of the liquid crystal panel 11 and presses the liquid crystal panel 11 from the front side, and a side wall portion 13b that protrudes from the outer peripheral side portion of the panel pressing portion 13a toward the back side. The cross-sectional shape is substantially L-shaped. Among these, the panel pressing portion 13a forms a horizontally long frame shape following the outer peripheral side portion (non-display area, frame portion) of the liquid crystal panel 11, and presses the outer peripheral side portion of the liquid crystal panel 11 from the front side over almost the entire circumference. Is possible. In addition to the outer peripheral portion of the liquid crystal panel 11, the panel pressing portion 13 a includes the optical member 15 and the outer peripheral portion of the light guide plate 16 disposed on the outer side in the radial direction than the outer peripheral portion of the liquid crystal panel 11, and each LED unit. The LU also has a width that can be covered from the front side. The outer surface of the panel pressing portion 13a facing the front side (the surface opposite to the surface facing the liquid crystal panel 11) is exposed to the outside on the front side of the liquid crystal display device 10 like the display surface 11c of the liquid crystal panel 11. The front surface of the liquid crystal display device 10 is configured together with the display surface 11 c of the panel 11. On the other hand, the side wall part 13b has comprised the substantially square cylinder shape which protrudes toward the back side from the outer peripheral side part (specifically outer peripheral edge part) in the panel pressing part 13a. The side wall portion 13b surrounds the liquid crystal panel 11, the optical member 15, the light guide plate 16, and each LED unit LU accommodated in the entire circumference, and can also surround the back side chassis 14 over almost the entire circumference. . The side wall portion 13 b has an outer surface along the circumferential direction of the liquid crystal display device 10 exposed to the outside in the circumferential direction of the liquid crystal display device 10, and constitutes a top surface, a bottom surface, and both side surfaces of the liquid crystal display device 10.

As shown in FIG. 9, the frame-like frame 13 having the basic configuration described above is formed by assembling four divided frames 13S divided for each side (each long side portion and each short side portion). Is done. Specifically, the divided frame 13S includes a pair of long side divided frames 13SL constituting the long side portions of the frame 13 (panel pressing portion 13a and side wall portion 13b) and a pair of short sides constituting the short side portions. The side-side divided frame 13SS is used. The long side divided frame 13SL is made of a prismatic material having a substantially L-shaped cross section extending along the X axis direction, whereas the short side divided frame 13SS is substantially cross sectional extending along the Y axis direction. Made of L-shaped prismatic material. As a result, when manufacturing each divided frame 13S, it is possible to employ a manufacturing method such as extrusion molding of a metal material. For example, the frame-like frame 13 is temporarily manufactured by a manufacturing method such as cutting out of the metal material. Compared with the case of manufacturing, the manufacturing cost can be reduced. Adjacent long-side divided frames 13SL and short-side divided frames 13SS constitute a frame-like frame 13 by connecting ends in their extending directions. As shown in FIGS. 9 and 10, each end portion, which is a connecting portion of the long side divided frame 13SL and the short side divided frame 13SS (the joint of the frame 13), is viewed in the X-axis direction and the Y axis. It has an inclined shape with respect to both directions, and more specifically has a shape that follows a straight line connecting the inner end position and the outer end position at each corner of the panel pressing portion 13a. The long side divided frame 13SL covers each LED unit LU in addition to the liquid crystal panel 11, the optical member 15, and the light guide plate 16 (see FIG. 6), and thus the short side divided that does not cover the LED unit LU. Compared to the frame 13SS (see FIG. 8), it is formed relatively wide.

As shown in FIGS. 4 and 5, a screw mounting portion (fixing member mounting) to which a screw member (fixing member) SM is mounted at a position closer to the inner side (closer to the light guide plate 16) than the side wall portion 13b in the panel pressing portion 13a. Part) 21 is integrally formed. The screw attachment portion 21 projects from the inner surface of the panel pressing portion 13a toward the back side along the Z-axis direction, and extends along each side (X-axis direction or Y-axis direction) of the panel pressing portion 13a. It has an almost block shape. The screw attachment portion 21 is provided on each side of the panel pressing portion 13a, and each has a length dimension over the entire length of each side. As shown in FIG. 9, the screw attachment portion 21 is provided separately for each divided frame 13S constituting the frame 13, and when each divided frame 13S is assembled, the entire side of the side wall portion 13b having a rectangular tube shape is formed. It is assumed that it forms a frame shape continuous over the entire circumference with respect to the inner surface. As shown in FIGS. 4 and 5, the screw attachment portion 21 is formed with a groove portion 21 a that opens toward the back side and can fasten the screw member SM. The groove portion 21a is formed over substantially the entire length along the length direction of the screw attachment portion 21, and has a width dimension that is slightly smaller than the shaft portion of the screw member SM. The screw attachment portion 21 is arranged in the form of being interposed between the panel pressing portion 13a of the frame 13 and the chassis 14 in the Z-axis direction.

As shown in FIG. 4, the pair of screw attachment portions 21 on the long side is provided between the side wall portions 13 b of the frame 13 and the LED attachment portions 19 a of the heat radiating members 19 constituting the LED units LU in the Y-axis direction. It is arranged in an intervening manner, and a predetermined interval is provided between the LED mounting portion 19a. Of the pair of heat radiating members 19, the space between the heat radiating member 19 and the screw mounting portion 21 to which the heat radiating member 19 is attached is shown in FIGS. As shown in FIG. 7, the board accommodation space BS that can accommodate the printed circuit board 27 is formed. That is, the printed circuit board 27 is interposed between the screw attachment portion 21 and the LED attachment portion 19a. The printed circuit board 27 is made of a synthetic resin and has a horizontally long plate shape extending along the length direction (X-axis direction) of the screw mounting portion 21 and the LED mounting portion 19a. A posture parallel to the plate surface outside the LED mounting portion 19a (the side opposite to the LED substrate 18), in other words, the long side direction is the X axis direction, the short side direction is the Z axis direction, and the thickness direction is Y. The substrate is accommodated in the above-described substrate accommodation space BS in a posture matched with the axial direction. A plurality of flexible boards 26 are intermittently arranged along the long side direction of the printed board 27, and the other end portions are connected to the printed board 27, respectively. The flexible board 26 connected to the printed board 27 and the array board 11b of the liquid crystal panel 11 crosses the LED mounting portion 19a, the LED board 18 and the LED 17 along the Y-axis direction. Further, the printed circuit board 27 has a connector portion (not shown for both FPCs) to which one end side of the FPC is inserted and connected, and the other end side of the FPC is an FPC insertion hole (see FIG. (Not shown) is pulled out of the back side of the chassis 14 and connected to the control board CTB.

As shown in FIGS. 4 and 5, a light guide plate support portion 23 that supports the light guide plate 16 from the front side (display surface 11 c side) is located in the panel pressing portion 13 a at a position closer to the inner side than the screw mounting portion 21. It is integrally formed. The light guide plate support portion 23 protrudes from the inner surface of the panel pressing portion 13a toward the back side (light guide plate 16) along the Z-axis direction (the protruding direction of the screw mounting portion 21), and each side of the panel pressing portion 13a. Is formed in an elongated, substantially block shape extending along the line. The light guide plate support portion 23 is provided on each side of the panel pressing portion 13a and has a length dimension over the entire length of each side. As shown in FIG. 9, the light guide plate support portion 23 is divided and provided in each divided frame 13 </ b> S constituting the frame 13, similarly to the above-described screw mounting portion 21, and each divided frame 13 </ b> S is assembled. As a whole, a frame shape is provided that extends over the entire circumference of the panel pressing portion 13a (light guide plate 16). As shown in FIGS. 4 and 5, the light guide plate support portion 23 overlaps with the end portion 16EP of the light guide plate 16 protruding outward from the liquid crystal panel 11 in a plan view (viewed from the display surface 11c side). The protruding front end surface of the light guide plate 16 is in contact with the front side surface of the light guide plate 16, that is, the light emitting surface 16a. Therefore, the light guide plate support part 23 can be supported from the front side (display surface 11c side) with the light guide plate 16 sandwiched between the light guide plate 16 and the chassis 14 described later, and has a light guide plate support function. . The light guide plate 16 is pressed from the front side by the light guide plate support portion 23 whose end side portion 16EP forms a frame shape over the entire circumference. Since the long side portion of the end side portion 16EP of the light guide plate 16 with which the light guide plate support portion 23 abuts is an end portion having a light incident surface 16b for the LED 17, the light guide plate support portion 23 causes the light guide plate 16 to move. By supporting, it is possible to stably maintain the positional relationship between the LED 17 and the light incident surface 16b in the Z-axis direction.

A pair of long-side light guide plate support portions 23 provided on the long-side divided frame 13SL and extending along the long side of the panel pressing portion 13a are provided between the liquid crystal panel 11 and the LEDs 17, as shown in FIG. It is arranged in an intervening form. Specifically, the pair of long-side light guide plate support portions 23 closes the spaces between the LED 17 and the end surfaces of the liquid crystal panel 11 and the optical member 15 on the LED 17 side, so that the light from the LED 17 can be transmitted. In addition, it has a light shielding function to prevent direct incidence on the end surfaces of the liquid crystal panel 11 and the optical member 15 without passing through the light guide plate 16, and also functions as a “light shielding part”. Of the pair of light guide plate support portions 23 on the long side, the light guide plate support portion 23 in a positional relationship overlapping with the flexible substrate 26 in plan view includes a flexible substrate as shown in FIGS. A plurality of flexible board insertion groove portions 23 a for inserting the holes 26 are formed in the form of being intermittently juxtaposed in parallel along the X-axis direction, and the arrangement thereof matches the arrangement of the flexible boards 26.

As shown in FIGS. 4 and 5, a pressing protrusion 24 that protrudes to the back side, that is, the liquid crystal panel 11 side, is integrally formed on the inner edge portion of the panel pressing portion 13 a. The pressing protrusion 24 has a cushioning material 24a attached to its protruding tip surface, and the liquid crystal panel 11 can be pressed from the front side via the cushioning material 24a. As shown in FIG. 9, the pressing protrusion 24 and the cushioning material 24 a are configured to extend along each side in each divided frame 13 </ b> S constituting the frame 13, similarly to the screw mounting portion 21 described above. Also, each side is divided and provided, and when each divided frame 13S is assembled, the whole frame has a frame shape arranged on the inner peripheral edge of the panel pressing portion 13a.

As shown in FIG. 3, the chassis 14 has a generally horizontally shallow shallow plate shape as a whole so as to cover the light guide plate 16, the LED unit LU, and the like over almost the entire region from the back side. The outer surface of the chassis 14 facing the back side (the surface opposite to the surface facing the light guide plate 16 and the LED unit LU) is exposed outside the back side of the liquid crystal display device 10 and constitutes the back surface of the liquid crystal display device 10. is doing. The chassis 14 has a horizontally long bottom plate portion 14a similar to the light guide plate 16, and a pair of LEDs that protrude from the ends of both long sides of the bottom plate portion 14a to the back side and accommodate the LED unit LU. And an accommodating portion (light source accommodating portion) 14b.

As shown in FIGS. 3 and 4, the bottom plate portion 14 a can receive from the back side most of the light guide plate 16 on the center side in the short side direction (portions excluding both end portions in the short side direction). It can be said that it has a flat plate shape and constitutes a receiving portion for the light guide plate 16. As shown in FIG. 5, both end portions of the bottom plate portion 14 a in the long side direction extend outward from both end portions in the long side direction of the light guide plate 16, and the frame 13 and the chassis 14. Is a pair of screw mounting portions (fixing member mounting portions) 14a1 to which externally mounted screw members (fixing members) SM are fixed.

As shown in FIGS. 3 and 4, the LED accommodating portion 14b is arranged in such a manner that the bottom plate portion 14a is sandwiched from both sides in the short side direction, and is retracted to the back side by one step from the bottom plate portion 14a. Can be accommodated. The LED housing portion 14b is parallel to the bottom plate portion 14a and has a pair of screw mounting portions (fixing member mounting portions) 14b1 to which the screw members SM are mounted from the outside, and a pair of rises from both ends of the screw mounting portions 14b1 toward the front side. It is comprised from the side plate part 14b2, and the inner side plate part 14b2 of the pair of side plate parts 14b2 is connected to the bottom plate part 14a. The screw mounting portion 14b1 in the LED housing portion 14b is arranged in a state in which the heat radiating portion 19b of the heat radiating member 19 constituting the LED unit LU is in surface contact with the inner surface thereof. In addition, the outer side plate portion 14b2 in the LED housing portion 14b is inserted into a gap provided between the long-side screw mounting portion 21 and the side wall portion 13b, so that the chassis 14 is Y with respect to the frame 13. It has a function of positioning in the axial direction.

As described above, as shown in FIG. 3, the pair of screw mounting portions 14 b 1 constituting the LED housing portion 14 b are provided on both long sides of the outer peripheral side portion of the chassis 14 according to the present embodiment. A pair of screw mounting portions 14a1 constituting the bottom plate portion 14a are respectively formed on the side portions. A plurality of screw insertion holes 25 through which the screw members SM pass are respectively formed in the pair of screw mounting portions 14a1 included in the bottom plate portion 14a and the pair of screw mounting portions 14b1 included in the LED housing portion 14b. The screw mounting portions 14a1 and 14b1 are arranged so as to overlap the screw mounting portion 21 of the frame 13 in plan view, and the screw insertion holes 25 formed in the screw mounting portions 14a1 and 14b1 are screw-attached. It communicates with the groove 21 a of the portion 21. Therefore, the screw member SM passes through the screw insertion hole 25 along the Z-axis direction (the overlapping direction of the liquid crystal panel 11, the optical member 15, and the light guide plate 16) from the back side of the chassis 14 (the side opposite to the display surface 11c side). At the same time, the screw mounting portions 21a and 14b1 are sandwiched between the screw mounting portions 21 so as to be tightened into the groove portions 21a. When the screw member SM is tightened, a screw groove is formed in the groove portion 21a by a thread formed on the shaft portion of the screw member SM. The screw insertion holes 25 formed in the pair of screw mounting portions 14b1 of the LED housing portion 14b have screw fastening holes for fastening that are large enough to pass only the shaft portion of the screw member SM, as shown in FIG. As shown in FIG. 7, there are a heat-dissipating member screw insertion hole 25B large enough to pass the head in addition to the shaft portion of the screw member SM, and the screw member SM passed through the former is the heat dissipating portion 19b. The housing bottom plate portion 14b1 is fastened together and attached to the screw attachment portion 21, whereas the screw member SM passed through the latter functions to attach only the heat radiating portion 19b to the screw attachment portion 21.

By the way, in the liquid crystal display device 10 according to the present embodiment, the liquid crystal panel 11, the optical member 15, and the light guide plate 16 are directly superimposed, and the panel receiver is interposed between the light guide plate and the optical member and the liquid crystal panel as in the past. Since the member is not interposed, there is a concern that light leaks to the end of the liquid crystal panel 11. In particular, since the light guide plate 16 has an end side portion 16EP that protrudes outward from the end portion of the liquid crystal panel 11, the light emitted from the end side portion 16EP is the end portion of the liquid crystal panel 11. It has been a problem that light leaks due to direct incidence. When such light leakage occurs, the display quality of an image displayed on the liquid crystal panel 11 may be significantly reduced.

Therefore, as shown in FIGS. 4 and 5, the light guide plate supporting portion 23 according to the present embodiment is formed with a cutout optical member receiving recess 28 for receiving the end of the optical member 15. That is, the optical member 15 has an end side portion 15EP that protrudes outward from the end portion of the liquid crystal panel 11, and the end side portion 15EP is overlapped with the end side portion 16EP of the light guide plate 16. The end portion is accommodated in the optical member accommodating recess 28 formed by cutting out the light guide plate support portion 23 that supports the end portion 16EP. Accordingly, the end portion 15EP of the optical member 15 has a side surface facing the inner side (the liquid crystal panel 11 side) of the light guide plate support portion 23 from the end portion of the liquid crystal panel 11 when viewed in a plane (viewed from the display surface 11c side). It can be said that the end side portion 16EP of the light guide plate 16 is covered from the front side while being extended and extended to reach the inside. That is, the end portion 15EP of the optical member 15 is interposed between the end portion 16EP of the light guide plate 16 and the end portion of the liquid crystal panel 11. Thereby, the light emitted from the end portion 16EP of the light guide plate 16 is surely incident on the end portion 15EP of the optical member 15 stacked on the front side, and directly incident on the end portion (end surface) of the liquid crystal panel 11. Can be avoided. The light incident on the end portion 15EP of the optical member 15 is given a predetermined optical action of the respective sheets 15a, 15b, 15c, so that the light from the end portion 16EP of the light guide plate 16 is directly applied to the liquid crystal panel. Compared with the case where the light enters the end portion of the liquid crystal panel 11, the amount of light incident on the end portion of the liquid crystal panel 11 is reduced, and thus light leakage to the end portion of the liquid crystal panel 11 is reduced or alleviated.

Specifically, as shown in FIGS. 7 and 8, the optical member housing recess 28 is formed by cutting out an inner portion of the projecting tip portion of the light guide plate support portion 23, and the inner side (on the optical member 15 side). ) And the back side (light guide plate 16 side). Therefore, the optical member 15 can be accommodated in the optical member housing recess 28 along the Z-axis direction from the back side during assembly. Further, only the outer portion of the protruding tip portion of the light guide plate support portion 23 is left, and the protruding tip surface of the remaining outer portion comes into contact with the end portion 16EP of the light guide plate 16. The optical member accommodating recess 28 has a height dimension (dimension in the Z-axis direction) that is the sum of the thickness dimensions of all the optical members 15. It can be accommodated in a lump. In particular, the three optical members 15 include a diffusion sheet 15a, and the light emitted from the end side portion 16EP of the light guide plate 16 can be diffused by the end side portion 15EP of the diffusion sheet 15a. This is particularly effective for reducing the amount of light incident on the end of the liquid crystal panel 11.

As shown in FIGS. 7 and 8, the optical member housing recess 28 is formed in a stepped shape so as to follow the cross-sectional shape of the optical member 15. A side surface 28a facing the panel 11 side) and a ceiling surface (bottom surface in the inverted position) 28b parallel to the X-axis direction and the Y-axis direction and facing the back side (light guide plate 16 side) are included. . Among these, the ceiling surface 28a of the optical member housing recess 28 constitutes an optical member support surface 29 that supports the front surface of the optical member 15 from the front side. On the other hand, a predetermined clearance C <b> 1 is provided between the side surface 28 a of the optical member housing recess 28 and the end surface of the optical member 15, and they are normally not in contact with each other. Therefore, even when the internal temperature of the liquid crystal display device 10 rises during use and thermal expansion occurs in the optical member 15, the optical member 15 extends with thermal expansion within the above-described clearance C1. Is allowed. By the way, if the end portion 15EP of the optical member 15 is arranged outside the end portion of the liquid crystal panel 11 without forming the optical member housing recess, a clearance for allowing thermal expansion of the optical member 15 is secured. If this is the case, the clearance is provided between the side surface facing the inside of the light guide plate support and the end surface of the optical member 15, so that the end portion 16 EP of the light guide plate 15 is covered by the optical member 15. An undisclosed area will occur. In comparison with this, in this embodiment, the optical member housing recess 28 is provided in the light guide plate support 23, the end of the optical member 15 is housed in the optical member housing recess 28, and the end surface and the optical member housing recess 28. Since the clearance C1 is ensured between the side surface 28a and the side wall 28a, the clearance C is disposed inside the optical member housing recess 28, and between the light guide plate support 23 and the end of the liquid crystal panel 11. It has a configuration that does not exist. Accordingly, the end side portion 16EP of the light guide plate 16 is covered over the entire area by the end side portion 15EP of the optical member 15 between the light guide plate support portion 23 and the end portion of the liquid crystal panel 11, and thus the end side of the light guide plate 16 is covered. The emitted light from the portion 16EP can be reliably incident on the end portion 15EP of the optical member 15.

The optical member housing recess 28 is formed over the entire length along the length direction (side of the optical member 15) in the light guide plate support portion 23, as shown in FIGS. As a result, the optical member 15 is accommodated in the optical member accommodating recess 28 without being interrupted over the entire length of the end portion having the side along the length direction of the light guide plate support portion 23, and therefore, the end portion 15EP having the end portion. In addition, the light emitted from the end portion 16EP of the light guide plate 16 can be incident without leakage. And the optical member accommodation recessed part 28 is formed over the perimeter in the inner part of the light-guide plate support part 23 which makes a frame shape as a whole as already stated. As a result, the optical member 15 is housed in the optical member housing recess 28 without interruption of the outer peripheral end portion over the entire circumference, so that the end portions 15EP on both long sides having the outer peripheral end portion and The light emitted from the end portions 16EP on both long sides and the end portions 16EP on both short sides of the light guide plate 16 can be incident on the end portions 15EP on both short sides without leakage. it can. Thus, it is possible to reliably prevent light from directly entering the end portion of the liquid crystal panel 11 from the end portion 16EP of the light guide plate 16. Further, according to the configuration described above, the clearance C1 is provided over the entire circumference between the end surface (outer peripheral end surface) of the optical member 15 and the side surface 28a (inner peripheral side surface) of the optical member housing recess 28. become.

This embodiment has the structure as described above, and its operation will be described next. The liquid crystal display device 10 is manufactured by separately assembling each component (frame 13, chassis 14, liquid crystal panel 11, optical member 15, light guide plate 16, LED unit LU, etc.) manufactured separately. . At the time of assembly, all the components are assembled in a posture that is upside down with respect to the Z-axis direction from the posture shown in FIGS. 4 and 5. First, as shown in FIGS. 11 and 12, the frame 13 among the components is set on a work table (not shown) with the back surface facing upward in the vertical direction. The frame 13 is formed in a frame shape as a whole by connecting the four divided frames 13S to each other in advance.

As shown in FIG. 11, the liquid crystal panel 11 is provided for assembly in a state where the flexible substrate 26 and the printed circuit board 27 are connected in advance. The liquid crystal panel 11 with respect to the frame 13 set in the above-described posture, as shown in FIGS. 11 and 12, the CF substrate 11a is on the lower side in the vertical direction and the array substrate 11b is on the upper side in the vertical direction. And assembling. At this time, the printed circuit board 27 is attached to the screw attachment portion 21 while the plate surface is in a posture along the surface of the screw attachment portion 21 of the frame 13 facing the liquid crystal panel 11 side. For this reason, the flexible substrate 26 is bent into a substantially L shape in the middle. In this attachment process, each flexible substrate 26 is inserted while being positioned in the X-axis direction with respect to each flexible substrate insertion groove portion 23a of the light guide plate support portion 23 in a positional relationship overlapping in a plan view. Further, the liquid crystal panel 11 is buffered by receiving the front surface of the liquid crystal panel 11 by a buffer material 24 a attached to the pressing protrusion 24 in the frame 13.

Subsequently, the optical member 15 is directly stacked on the back surface of the liquid crystal panel 11. At this time, as shown in FIGS. 11 and 12, the optical member 15 is arranged in the order of a reflective polarizing sheet 15c arranged on the most front side, a lens sheet 15b arranged on the middle, and a diffusion sheet 15a arranged on the most back side. Are stacked. At the time of this assembly, the end portion 15EP of the optical member 15 that is arranged outside the liquid crystal panel 11 is accommodated in the optical member accommodating recess 28 formed in the light guide plate support portion 23 of the frame 13. . Here, since the optical member housing recess 28 is configured to open toward the back side along the Z-axis direction, that is, the assembly direction of the optical member 15, the end portion of the optical member housing recess 28 is attached as the optical member 15 is assembled. 15EP can be easily accommodated in the optical member accommodating recess 28 and is excellent in workability. Since this optical member accommodation recess 28 is formed over the entire circumference in the light guide plate support 23 having a frame shape, the end portion 15EP of the optical member 15 is accommodated in the optical member accommodation recess 28 over the entire circumference. At this time, the end side portion 15EP of the optical member 15 is supported from the front side by the optical member support surface 29 which is the inner surface of the optical member housing recess 28, so that the shape is maintained and the position is stabilized. . A clearance C <b> 1 is secured over the entire circumference between the end surface of the assembled optical member 15 and the side surface 28 a that is the inner surface of the optical member housing recess 28. Further, the side surface 28a of the optical member housing recess 28 enables the optical member 15 to be roughly positioned in the direction along the plate surface (X-axis direction and Y-axis direction). As an assembling method of the optical member 15, for example, the sheets 15a, 15b, and 15c may be laminated in advance, and the laminated sheet group may be assembled to the frame 13 and the liquid crystal panel 11 at once. Absent.

On the other hand, as shown in FIG. 11, an LED unit LU in which the LED 17, the LED substrate 18 and the heat radiating member 19 are integrated in advance is assembled to the frame 13. The LED unit LU has a screw mounting portion of the frame 13 in a state where the LED 17 faces the center side (inner side) of the frame 13 and the heat radiating portion 19b of the heat radiating member 19 faces the screw mounting portion 21 of the frame 16. 21 is attached. In a state where each LED unit LU is attached to each screw attachment portion 21, each insertion hole 19 b 1 included in the heat radiating portion 19 b is communicated with the groove portion 21 a of the screw attachment portion 21. Of the pair of LED units LU, those that have a positional relationship overlapping with the flexible substrate 26 when seen in plan view, when the heat dissipating member 19 is attached to the screw attachment portion 21, the LED attachment portion 19a and the screw A board housing space BS is formed between the mounting portion 21 and the printed board 27 is housed therein. After the LED unit LU is attached to the screw attachment portion 21 in this manner, the screw member SM is subsequently threaded into the groove portion 21a of the screw attachment portion 21 through the predetermined insertion hole 19b1 in the heat radiating portion 19b from the back side. Since the heat radiating portion 19b of the heat radiating member 19 is sandwiched between the head portion of the screw member SM and the screw mounting portion 21, the LED unit LU has a screw mounting portion at a stage before the chassis 14 described below is assembled. 21 is held in an attached state (see FIG. 7). The timing for assembling the LED unit LU to the frame 13 may be before the optical member 15 is assembled or before the liquid crystal panel 11 is assembled.

When the operation of screwing the LED unit LU to the screw mounting portion 21 is finished, as shown in FIGS. 11 and 12, the light guide plate 16 is placed on the back side of the optical member 15 (diffusion sheet 15a) disposed on the back side. Laminate directly on the surface. At this time, the end side portion 16EP of the light guide plate 16 protruding outward from the end portion of the liquid crystal panel 11 is overlapped on the back side with respect to the end side portion 15EP of the optical member 15, and the light guide plate support portion 23 of the frame 13 is overlapped. Is supported from the front side, that is, from the lower side in the vertical direction during assembly. Since the light guide plate support portion 23 has a frame shape following the outer shape of the light guide plate 16, the end portion 16EP of the light guide plate 16 is supported by the light guide plate support portion 23 over the entire circumference. As the light guide plate 16 is assembled, the end portion of the end portion 15EP of the optical member 15 accommodated in the optical member accommodating recess 28 is connected to the optical member support surface 29 of the optical member accommodating recess 28 and the light guide plate 16. The end portion 16EP is sandwiched between the light exit surface 16a. When the assembly of the light guide plate 16 is completed, an operation of successively laminating the light guide reflection sheet 20 on the surface 16c of the light guide plate 16 opposite to the light exit surface 16a is performed.

After the liquid crystal panel 11, the optical member 15, the light guide plate 16, and the LED unit LU are assembled to the frame 13 as described above, the operation of assembling the chassis 14 is subsequently performed. As shown in FIGS. 11 and 12, the chassis 14 is assembled to the frame 13 in a state where the surface on the front side faces the lower side in the vertical direction. At this time, by inserting the housing side plate portions 14b2 outside the LED housing portions 14b of the chassis 14 into the gaps between the side wall portions 13b on both long sides of the frame 13 and the screw mounting portions 21, the frame 13, the chassis 14 is positioned in the Y-axis direction. In the assembling process, the heads of the screw members SM previously attached to the heat radiating member 19 and the screw attaching portion 21 are passed through the respective heat radiating member screw insertion holes 25B in both the LED housing portions 14b of the chassis 14 (FIG. 7). See). And the bottom plate part 14a of the chassis 14 is the light guide plate 16 (light guide reflection sheet 20), each LED mounting part 14a1 of the bottom plate part 14a is each screw mounting part 21, and the LED mounting part 14b1 of each LED accommodating part 14b. Each screw insertion hole 25 included in the LED mounting portion 14a1 of the bottom plate portion 14a and each screw for tightening included in the LED mounting portion 14b1 of each LED housing portion 14b when the heat dissipation portions 19b of the respective heat radiating members 19 are in contact with each other. The screw member SM is passed through the insertion hole 25 </ b> A from the back side, and the screw member SM is screwed into the groove portion 21 a of the screw attachment portion 21. With this screw member SM, the LED unit LU and the chassis 14 are held attached to the screw attachment portion 21 (see FIGS. 6 and 8). Since each screw member SM attached in this way is arranged on the back side of the chassis 14 constituting the appearance of the back side of the liquid crystal display device 10, the front side, that is, the user side who uses the liquid crystal display device 10. Therefore, the liquid crystal display device 10 has a clean appearance and a high design.

As described above, the assembly of the liquid crystal display unit LDU is completed. Thereafter, the stand mounting member STA and the various substrates PWB, MB, and CTB are assembled on the back side of the liquid crystal display unit LDU, and then the stand ST and the cover member CV are assembled, whereby the liquid crystal display device 10 and the television receiver TV. Is manufactured. The liquid crystal display device 10 manufactured in this way has a liquid crystal panel in addition to a frame 13 that holds the liquid crystal panel 11 from the display surface 11c side and a chassis 14 that constitutes the backlight device 12, respectively. 11 and the optical member 15 are directly laminated, so that the frame 13 and the chassis 14 are separated from each other by a synthetic resin cabinet or the liquid crystal panel 11 and the optical member 15 as in the prior art. Compared to those having a panel receiving member that keeps them in a non-contact manner, the number of parts and assembly man-hours are reduced, so that the manufacturing cost is reduced and the thickness and weight are reduced.

When the power source of the liquid crystal display device 10 manufactured as described above is turned on, as shown in FIG. 4, various signals are received from the control board CTB by receiving power from the power board PWB, and the printed board 27 and the flexible board 26. It is supplied to the liquid crystal panel 11 via (driver DR) and its driving is controlled, and each LED 17 constituting the backlight device 12 is driven. The light from each LED 17 is guided by the light guide plate 16 and then transmitted through the optical member 15 so that the light is converted to a uniform plane light and then irradiated to the liquid crystal panel 11. An image is displayed. The operation of the backlight device 12 will be described in detail. When each LED 17 is turned on, the light emitted from each LED 17 enters the light incident surface 16b of the light guide plate 16 as shown in FIG. The light incident on the light incident surface 16b is totally reflected at the interface with the external air layer in the light guide plate 16 or is reflected by the light guide reflection sheet 20 and is propagated through the light guide plate 16. The optical member 15 is emitted from the light exit surface 16a by being reflected or scattered by a reflection unit or a scattering unit (not shown).

Here, in the liquid crystal display device 10 according to this embodiment, the liquid crystal panel 11 is directly laminated on the light guide plate 16 and the optical member 15, and the panel receiving member is interposed as in the related art. Absent. Therefore, when this panel receiving member is simply abolished, the light emitted from the end portion 16EP arranged outside the end portion of the liquid crystal panel 11 in the light guide plate 16 is emitted to the end portion of the liquid crystal panel 11. On the other hand, light may be leaked by direct incidence. In this regard, in the present embodiment, as shown in FIGS. 6 to 8, the optical member 15 has an end side portion 15EP disposed outside the end portion of the liquid crystal panel 11, and this end side portion 15EP. Is overlapped with the end side portion 16EP of the light guide plate 16, and the end portion is accommodated in the optical member accommodating recess 28 formed in the light guide plate support portion 23 that supports the end side portion 16EP. That is, the end side portion 15EP of the optical member 15 covers the end side portion 16EP of the light guide plate 16 over a range extending from the end portion of the liquid crystal panel 11 to the inside of the optical member accommodating recess 28 in a plan view. The light emitted from the 16 end-side portions 16EP can be reliably incident on the end-side portion 15EP of the optical member 15, and can be prevented from directly entering the end portion of the liquid crystal panel 11. The light incident on the end portion 15EP of the optical member 15 is given a predetermined optical action of the respective sheets 15a, 15b, 15c, so that the light from the end portion 16EP of the light guide plate 16 is directly applied to the liquid crystal panel. Compared with the case where the light enters the end portion of the liquid crystal panel 11, the amount of light incident on the end portion of the liquid crystal panel 11 is reduced, and thus light leakage to the end portion of the liquid crystal panel 11 is reduced or alleviated.

Moreover, the optical member housing recess 28 is formed so as to accommodate the end of the optical member 15 over the entire length in the light guide plate support portion 23, and is formed over the entire circumference of the light guide plate support portion 23 having a frame shape. Thus, since the outer peripheral end portion of the optical member 15 is accommodated over the entire circumference, the emitted light from the end side portion 16EP of the light guide plate 16 enters the end side portion 15EP of the optical member 15 over the entire circumference. Thus, direct light incident on the outer peripheral edge of the liquid crystal panel 11 can be prevented. Therefore, light leakage to the end of the liquid crystal panel 11 can be reduced more effectively. Further, since the optical member 15 accommodated in the optical member accommodating recess 28 includes the diffusion sheet 15a, the light is emitted from the end side portion 16EP of the light guide plate 16 by the end side portion 15EP of the diffusion sheet 15a. Since the light can be diffused, the amount of light incident on the end of the liquid crystal panel 11 can be further reduced. In addition, since a clearance C1 is provided between the side surface 28a of the optical member housing recess 28 and the end surface of the optical member 15 to be housed, the LED 17 is turned on when the liquid crystal display device 10 is used. As a result, even if the temperature inside the liquid crystal display device 10 rises and the optical member 15 thermally expands as the temperature rises, the optical member 15 is allowed to extend within the range of the clearance C1. The As a result, deformation such as bending or wrinkle is less likely to occur in the optical member 15, and unevenness is less likely to occur in the light transmitted through the central side portion of the optical member 15, so that the display area of the liquid crystal panel 11 to which the light is supplied The display quality of the image displayed on the screen can be made high.

Further, as described above, the liquid crystal display device 10 according to the present embodiment has a structure that does not have a conventional panel receiving member. Therefore, the space on the LED 17 side communicates with the space on the liquid crystal panel 11 side. There is a concern that the light is directly incident on the end face of the liquid crystal panel 11 without passing through the light guide plate 16. In this regard, in the present embodiment, the light guide plate support portion 23 is arranged on the frame 13 so as to be interposed between the LED 17 and the liquid crystal panel 11 as shown in FIG. The space on the 11th side is partitioned in an optically isolated state. Thereby, it is possible to block the light from the LED 17 from directly entering the end face of the liquid crystal panel 11 without passing through the light guide plate 16, thereby preventing the display quality from being deteriorated due to light leakage. In addition, since the light guide plate support portion 23 supports the end portion 16EP of the light guide plate 16 by sandwiching it between the chassis 14 over the entire circumference, the light incident on the LED 17 and the end portions of the light guide plate 16 is supported. The positional relationship in the Z-axis direction with the surface 16b can be stabilized. Thereby, the incident efficiency of the light which injects into the light-incidence surface 16b from LED17 can be stabilized.

As described above, the liquid crystal display device (display device) 10 according to the present embodiment includes an LED (light source) 17, a liquid crystal panel (display panel) 11 that performs display using the light of the LED 17, and the liquid crystal panel 11. A light guide plate 16 which is arranged so as to overlap with the side opposite to the display surface 11c side and whose end face is arranged to face the LED 17 and whose end side portion 16EP is arranged outside the end of the liquid crystal panel 11. The optical member 15 disposed between the liquid crystal panel 11 and the light guide plate 16 and the end side portion 15EP thereof overlapping the end side portion 16EP of the light guide plate 16, the liquid crystal panel 11 and the light guide plate. It has a frame 13 and a chassis 14 that are a pair of holding portions that hold the optical plate 16 in a form that is sandwiched from the display surface 11c side and the opposite side thereof. The holding member HM that houses the LED 17 between the chassis 14, the frame 13 that is a pair of holding portions, and the frame 13 that is a holding portion arranged on the display surface 11 c side of the chassis 14, toward the light guide plate 16 side. A light guide plate support portion 23 that protrudes and supports the end portion 16EP of the light guide plate 16 from the display surface 11c side, and is formed by cutting out an optical member housing recess 28 for housing the end portion of the optical member 15. And an optical plate support part 23.

In this way, the light emitted from the LED 17 enters the end face of the light guide plate 16 and then is guided to the liquid crystal panel 11 through the optical member 15 while being given a predetermined optical action. An image is displayed on the liquid crystal panel 11 by using the image. The light guide plate 16 is supported from the display surface 11c side by the light guide plate support portion 23 so that the end portion 16EP disposed outside the end portion of the liquid crystal panel 11 can maintain its shape and stabilize the position. Is planned. By the way, the liquid crystal panel 11, the optical member 15, and the light guide plate 16 are arranged so as to overlap each other, and the display surface 11c side and the opposite side by the frame 13 and the chassis 14 which are a pair of holding portions of the holding member HM. Since the panel receiving member is not interposed between the light guide plate and the optical member and the liquid crystal panel as in the prior art, light leaks to the end of the liquid crystal panel 11. There is a concern that this will occur. However, in the light guide plate support portion 23 that supports the end portion 16EP of the light guide plate 16, an optical member housing recess 28 for housing the end portion of the optical member 15 is formed by notching, so that the end side of the optical member 15 is formed. The portion 15EP is arranged so as to overlap with the end side portion 16EP of the light guide plate 16 in a range extending from the end of the liquid crystal panel 11 to the inside of the optical member housing recess 28 of the light guide plate support 23 as viewed from the display surface 11c side. Therefore, the light emitted from the end side portion 16EP of the light guide plate 16 can be reliably incident on the end side portion 15EP of the optical member 15, and the light can be prevented from directly entering the end portion of the liquid crystal panel 11. it can. Thereby, the light leakage to the edge part of the liquid crystal panel 11 can be suppressed. In addition, since the optical member 15 is used to suppress light leakage as described above, the number of parts is smaller than that in a case where light leakage is suppressed by newly adding a reflector or the like. This is suitable for reducing costs and the like.

Further, a clearance C <b> 1 is provided between the side surface 28 a that is the inner surface of the optical member housing recess 28 and the end surface of the optical member 15. In this way, even when thermal expansion occurs in the optical member 15 due to changes in the temperature environment, the clearance C <b> 1 is provided between the side surface 28 a of the optical member housing recess 28 and the end surface of the optical member 15. Thus, the optical member 15 can be allowed to expand with thermal expansion. As a result, deformation such as bending or wrinkle is less likely to occur in the optical member 15, so that unevenness does not easily occur in the light transmitted through the optical member 15, thereby improving the display quality. Further, even if light is emitted from the end side portion 16EP of the light guide plate 16 toward the clearance C1, the light hits the inner surface of the optical member housing recess 28, so that it does not easily enter the end portion of the liquid crystal panel 11. It is said.

Further, the light guide plate support portion 23 is arranged in such a manner as to support a portion facing the LED 17 in the end side portion 16EP of the light guide plate 16 and to be interposed between the LED 17 and the end portion of the liquid crystal panel 11. In this way, the light that enters directly from the LED 17 to the end of the liquid crystal panel 11 is shielded by the light guide plate support 23 that is disposed between the LED 17 and the end of the liquid crystal panel 11. Therefore, the occurrence of light leakage can be further suppressed. In addition, by supporting the portion of the end portion 16EP of the light guide plate 16 facing the LED 17 with the light guide plate support portion 23, the positional relationship of the light guide plate 16 with respect to the LED 17 can be stabilized. The incident efficiency of light incident on the end face can be stabilized.

Also, a plurality of optical members 15 are arranged so as to be stacked on each other, and the end portions of the plurality of optical members 15 are accommodated in the optical member accommodating recesses 28. In this way, each end of the plurality of optical members 15 stacked on each other is housed in the optical member housing recess 28, so that the light emitted from the end portion 16 EP of the light guide plate 16 is emitted from the plurality of optical members 15. Can be incident on the end portion 15EP. Thereby, the light emitted from the end portion 16EP of the light guide plate 16 becomes more difficult to directly enter the end portion of the liquid crystal panel 11, which is suitable for suppressing light leakage.

Further, an optical member support surface 29 capable of supporting the surface on the display surface 11 c side at the end of the optical member 15 is provided on the inner surface of the optical member housing recess 28. In this way, the surface on the display surface 11c side at the end of the optical member 15 can be supported by the optical member support surface 29, so that the shape of the optical member 15 can be maintained and the position can be stabilized. The optical function can be appropriately exhibited.

Further, the light guide plate support portion 23 is configured to extend along the side of the end portion of the optical member 15, and the optical member accommodation recess 28 is formed so as to accommodate the end portion of the optical member 15 over the entire length. . In this way, since the end of the optical member 15 is accommodated in the optical member accommodating recess 28 over the entire length, the light emitted from the end portion 16EP along the side of the end of the optical member 15 in the light guide plate 16 is emitted. The light can be incident on the optical member 15 without leakage, and thereby the occurrence of light leakage can be more suitably suppressed.

Further, the light guide plate support portion 23 is formed in a frame shape so as to support the end side portion 16EP of the light guide plate 16 over the entire circumference, and the optical member accommodation recess 28 accommodates the outer peripheral end portion of the optical member 15 over the entire circumference. It is formed as follows. In this way, the end portion 16EP of the light guide plate 16 can be supported over the entire circumference by the light guide plate support portion 23 formed in a frame shape, so that the shape of the light guide plate 16 is maintained and the position is stabilized. Therefore, the display quality can be further improved. Moreover, since the outer peripheral end portion of the optical member 15 is accommodated in the optical member accommodating recess 28 over the entire circumference, the light emitted from the end side portion 16EP of the light guide plate 16 enters the end side portion 15EP of the optical member 15 over the entire circumference. Therefore, the occurrence of light leakage can be prevented more reliably.

Further, the light guide plate support portion 23 is formed so that the optical member housing recess 28 opens toward the light guide plate 16 side. If it does in this way, the operation | work which accommodates the edge part of the optical member 15 in the optical member accommodation recessed part 28 at the time of an assembly | attachment can be performed easily, and it is excellent in assembly workability | operativity.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the optical member housing recess 128 is configured not to press the optical member 115 from the front side. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 13, a clearance C2 is provided between the optical member support surface 129, which is the inner surface of the optical member housing recess 128 according to the present embodiment, and the front side (display surface 111c side) surface of the optical member 115. Yes. Specifically, the clearance C2 is provided between the front surface of the reflective polarizing sheet 115c arranged on the most front side of the optical member 115 and the optical member support surface 129, and both of them are normally non-contact. It is kept in a state. That is, normally, the optical member support surface 129 of the optical member housing recess 128 is configured such that no pressing force is applied to the optical member 115 from the front side or the pressing force is difficult to be applied. Therefore, even when the optical member 115 undergoes thermal expansion or contraction due to a change in temperature environment, the degree of freedom of the optical member 115 expanding and contracting is increased, and accordingly, the optical member 115 can be bent or Deformations such as wrinkles are less likely to occur. Therefore, the display quality of the image displayed on the liquid crystal panel 111 by the light transmitted through the optical member 115 can be further improved. The clearance C2 communicates with a clearance C1 provided between the side surface 128a of the optical member housing recess 128 and the end surface of the optical member 115, and both form a space having an L-shaped cross section. .

As described above, according to the present embodiment, there is a clearance C2 between the optical member support surface 129 that is the inner surface of the optical member housing recess 128 and the surface on the display surface 111c side at the end of the optical member 115. Has been. In this case, it is difficult to apply a pressing force to the end of the optical member 115 from the optical member support surface 129 of the optical member housing recess 128, so that when the optical member 115 is thermally expanded or contracted further, It becomes easy to expand and contract. As a result, deformation such as bending and wrinkle is less likely to occur in the optical member 115 and the display quality is excellent.

<Embodiment 3>
Embodiment 3 of the present invention will be described with reference to FIG. 14 or FIG. In the third embodiment, the light shielding portion 30 is formed on the end portion 215EP of the optical member 215. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

In the end side portion 215EP of the optical member 215 according to the present embodiment, as shown in FIG. 14, a light shielding portion 30 that blocks light emitted from the end side portion 216EP of the light guide plate 216 is formed. The light shielding portion 30 is made of a light shielding material such as a paint exhibiting black, for example, and is integrally provided by printing the light shielding material on the end portion 215EP of the optical member 215. The light shielding portion 30 is formed on the back side of the end portion 215EP of the optical member 215, that is, the surface on the light guide plate 216 side. The light shielding portion 30 is selectively formed only on the diffusion sheet 215a disposed on the backmost side (light guide plate 216 side) of the three optical members 215, and is formed on the other lens sheet 215b and the reflective polarizing sheet 215c. Is not formed. Therefore, the light emitted from the end side portion 216EP of the light guide plate 216 is shielded by the light shielding portion 30 formed on the back surface of the end side portion 215EP of the diffusion sheet 215a that is superimposed immediately on the front side of the end side portion 216EP. Therefore, it is avoided that the light is incident on all of the diffusion sheet 215a, the lens sheet 215b, and the reflective polarizing sheet 215c. Thereby, the incident light quantity to the edge part of the liquid crystal panel 211 can be reduced further. Note that when the light shielding unit 30 is provided, printing means such as screen printing and ink jet printing can be employed.

As shown in FIG. 14, the light shielding portion 30 is formed over almost the entire area of the end portion 215EP of the optical member 215. Specifically, the portion of the optical member 215 accommodated in the optical member accommodating recess 228; As viewed in a plane (viewed from the display surface 211c side), the light guide plate support 223 is formed in a range extending from the side facing the inner side of the light guide plate support 223 to the portion disposed between the end surfaces of the liquid crystal panel 211. Thereby, the light emitted from the end portion 216EP of the light guide plate 216 can be reliably blocked by the light blocking portion 30. Further, as shown in FIG. 15, the light shielding portion 30 is formed over the entire circumference of the end side portion 215EP of the optical member 215, and is formed in a range that forms a frame shape when seen in a plane. Thereby, the light emitted from the end portion 216EP of the light guide plate 216 can be shielded by the light shielding portion 30 over the entire circumference. In FIG. 15, the formation range of the light shielding portion 30 in the optical member 215 is shown in a shaded shape.

As described above, according to the present embodiment, the light shielding portion 30 that blocks the light emitted from the end portion 216EP of the light guide plate 216 is formed in the end portion 215EP of the optical member 215. In this way, light emitted from the end side portion 216EP of the light guide plate 216 can be blocked by the light shielding portion 30 formed in the end side portion 215EP of the optical member 215, and thus light leakage to the end portion of the liquid crystal panel 211 Can be prevented more reliably.

In addition, the optical members 215 are arranged so that a plurality of the optical members 215 are stacked on each other. Is formed. In this way, by selectively forming the light shielding portion 30 on the optical member 215 arranged closest to the light guide plate 216, it is possible to block the incidence of light on the other optical members 215. Since the light shielding portion 30 is not formed on the optical members 215 other than the optical member 215 arranged closest to the light guide plate 216, the cost required to form the light shielding portion 30 can be minimized.

The light shielding portion 30 is disposed between at least a portion of the optical member 215 accommodated in the optical member accommodating recess 228 and the light guide plate support portion 223 and the end surface of the liquid crystal panel 211 when viewed from the display surface 211c side. It is formed in a range spanning the part. In this way, the light emitted from the end portion 216EP of the light guide plate 216 can be more reliably blocked by the light blocking portion 30, so that light leakage to the end portion of the liquid crystal panel 211 can be more reliably prevented. it can.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. In this Embodiment 4, what changed the form of the optical member accommodation recessed part 328 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 16, the optical member housing recess 328 according to the present embodiment is configured to open toward the oblique back side on the side facing the inside of the light guide plate support 323, thereby supporting the light guide plate. In the portion 323, a bottom portion 31 is formed that is disposed so as to be interposed between the optical member 315 and the light guide plate 316. The bottom portion 31 is arranged so as to partially overlap the end portion 316EP of the light guide plate 316 from the front side, so that the light emitted from the end portion 316EP of the light guide plate 316 can be blocked in the overlapping region. It is said. This prevents light from the end portion 316EP of the light guide plate 316 from entering the end portion of the end portion 315EP of the optical member 315 that is accommodated in the optical member accommodation recess 328. The amount of incident light can be reduced, and as a result, the amount of incident light on the end of the liquid crystal panel 311 can be reduced. The bottom 31 has a triangular cross-sectional shape, and the inner surface 31a is inclined. Accordingly, the end portion 315EP of the optical member 315 is bent at the end accommodated in the optical member accommodating recess 328. The opening width of the optical member housing recess 328, that is, the distance between the inner surface 31a of the bottom 31 and the optical member support surface 329 is set to be slightly larger than the dimension obtained by adding the thickness dimensions of all the optical members 315. Thereby, when accommodating each edge part in all the optical members 315 collectively in the optical member accommodation recessed part 328, the operation | work which inserts each edge part can be performed easily. The optical member housing recess 328 is configured to open only on the side facing the inner side of the light guide plate support 323, and does not open on the protruding front end surface. Thereby, the width dimension of the bottom part 31 (protrusion front-end | tip part of the light-guide plate support part 323) is the same as the width dimension in the protrusion base end part of the light-guide plate support part 323, Therefore The light-guide plate 316 in the light-guide plate support part 323 is included. The contact area with respect to the end side portion 316EP is relatively larger than that described in the first embodiment. Therefore, the light guide plate 316 can be supported more stably.

As described above, according to the present embodiment, the light guide plate support 323 has the bottom 31 interposed between the end of the optical member 315 accommodated in the optical member accommodation recess 328 and the light guide plate 316. Yes. In this way, light can be blocked from entering from the end portion 316EP of the light guide plate 316 to the end of the optical member 315 accommodated in the optical member accommodating recess 328 by the bottom 31. Thereby, since the amount of incident light from the end side portion 316EP of the light guide plate 316 to the end side portion 315EP of the optical member 315 is reduced, the incidence of light to the end portion of the liquid crystal panel 311 can be further suppressed. And since the support area with respect to the light-guide plate 316 in the light-guide plate support part 323 is expanded by the bottom part 31, the light-guide plate 316 can be supported more stably.

In addition, a plurality of optical members 315 are arranged in a stacked manner, whereas the light guide plate support portion 323 has an inner surface 31a of the bottom 31 that is inclined and a plurality of optical members in the optical member receiving recess 328. Each end of 315 is formed to be received. In this way, each end of the plurality of optical members 315 can be accommodated in the optical member accommodating recess 328 by making the inner surface 31a of the bottom 31 inclined. Thereby, the light emitted from the end side portion 316EP of the light guide plate 316 can be made incident on the plurality of optical members 315, so that the light emitted from the end side portion 316EP of the light guide plate 316 directly enters the end portion of the liquid crystal panel 311. This makes it more difficult to make the light incident, and is suitable for suppressing light leakage.

<Embodiment 5>
Embodiment 5 of the present invention will be described with reference to FIG. In this Embodiment 5, what changed further the form of the optical member accommodation recessed part 428 from above-mentioned Embodiment 4 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 4 is abbreviate | omitted.

As shown in FIG. 17, the optical member housing recess 428 according to the present embodiment has a form that opens in the X-axis direction or the Y-axis direction toward the inside on the side surface facing the inside of the light guide plate support 423. As a result, the light guide plate support 423 is formed with a bottom portion 431 disposed so as to be interposed between the optical member 415 and the light guide plate 416. The bottom portion 431 has a horizontally long block shape in cross section, and the inner surface 431a has a flat shape parallel to the X-axis direction and the Y-axis direction. The opening width of the optical member housing recess 428, that is, the distance between the inner surface 431a of the bottom 431 and the optical member support surface 429 is set to be slightly larger than the thickness dimension of one optical member 415. In addition, the optical member housing recess 428 is disposed at a position that aligns in the Z-axis direction with the optical member 415 (reflective polarizing sheet 415c) disposed on the most front side. Only the end of the optical member 415 arranged on the front side is accommodated. Therefore, the other two optical members 415 (the diffusion sheet 415a and the lens sheet 415b) are arranged so that the end surfaces thereof are disposed at positions having a clearance between the side surfaces facing the inside of the light guide plate support portion 423. It is said.

<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 Embodiments 1 to 3 described above, the configuration in which the end portions of all the optical members are accommodated in the optical member accommodation recess formed in the light guide plate support portion that does not have the bottom portion is shown. The number of optical members housed in the optical member housing recesses formed in the light guide plate support portion that does not have the number is less than the total number of optical members (specifically, one or two when the total number is three) ).

(2) The technical matter described in the third embodiment (technique for forming a light-shielding portion on the optical member) is accommodated in the optical member-accommodating concave portion having the structure described in the fourth embodiment (an oblique opening structure). If it is applied to the optical member bent in this way, the light blocking function for the light from the end side portion of the light guide plate is further improved, which is more preferable. Needless to say, the technical matters described in the third embodiment can be applied to the configurations described in the second and fifth embodiments.

(3) In each of the above-described embodiments, the light guide plate support portion is formed in a frame shape so as to surround the light guide plate. However, for example, the light guide plate support portion has both lengths of the end side portions of the light guide plate. A pair may be selectively provided in association with the side portion or both short side portions. In that case, an optical member accommodating recess is formed in the pair of light guide plate support portions, and both the long side end or both short side ends of the end side portion of the optical member are accommodated in the optical member accommodating recess. That's fine. Of course, it is possible to selectively form the light guide plate support portion and the optical member housing recess in association with any three sides or one side of the light guide plate and the optical member.

(4) In each of the above-described embodiments, the light guide plate support portion and the optical member housing recess have a length that extends over the entire length of the sides of the light guide plate and the optical member. The present invention also includes a member housing recess whose length is less than the entire length of the sides of the light guide plate and the optical member. In that case, a plurality of light guide plate support portions and optical member housing recesses may be provided for each side of the light guide plate and the optical member.

(5) In each of the above-described embodiments, the optical member-accommodating concave portion is formed over the entire circumference with respect to the light guide plate support portion having a frame shape. The optical member housing recess may be partially formed in the circumferential direction. Specifically, the optical member housing recess is selectively formed on both long side portions or both short side portions of the frame-shaped light guide plate support portion, or any three sides or any of the light guide plate support portions An optical member housing recess can be selectively formed on one side.

(6) In addition to the above-described embodiments, the cross-sectional shape of the optical member housing recess can be changed as appropriate.

(7) Besides the above-described embodiments, the type of optical member, the number of sheets used, the stacking order, and the like can be changed as appropriate. In that case, it is possible to use a plurality of optical members of the same type (for example, a diffusion sheet).

(8) In Embodiment 3 described above, the light shielding portion is formed over the entire circumference at the end portion of the optical member. However, the light shielding portion is partially formed in the circumferential direction at the end side portion of the optical member. Are also included in the present invention. In that case, a light shielding part is selectively formed on both long side parts or both short side parts of the optical member, or a light shielding part is selectively formed on any three sides or any one side of the optical member. be able to. In addition, it is also possible to selectively form the light shielding part on an optical member other than the diffusion sheet (an optical member disposed closest to the light guide plate). Furthermore, the light shielding part can be formed on a plurality of optical members, or the light shielding part can be formed on the surface of the optical member on the front side (the side opposite to the light guide plate side).

(9) In Embodiment 3 described above, the light shielding portion is formed in the end side portion of the optical member over a range from the portion accommodated in the optical member accommodating recess to the end surface of the liquid crystal panel as viewed in plan. However, the formation range of the light shielding portion can be changed as appropriate. Specifically, for example, the light shielding portion may be formed only in a range from the side surface facing the inside of the light guide plate support portion to the end surface of the liquid crystal panel in the end portion of the optical member in a plan view.

(10) Besides the above-described embodiments, the arrangement of the LED units (LED substrate, heat radiating member) can be changed as appropriate. For example, the LED unit is arranged so as to face only one long side or one short side end of the light guide plate, or the LED unit is arranged for each end of any three sides of the light guide plate. The present invention includes those arranged so as to face each other and those arranged so that the LED units face each other on all four sides of the light guide plate.

(11) In each of the above-described embodiments, two LED units (LED substrate, heat radiating member) are arranged for one side of the light guide plate. However, the LED unit is arranged for one side of the light guide plate. You may make it arrange | position 1 or 3 or more.

(12) In each of the above-described embodiments, the frame and the chassis both show the appearance members constituting the appearance of the liquid crystal display device. For example, the chassis is provided with a separately prepared appearance component on the back side. Thus, the present invention includes a configuration in which the chassis is not exposed to the outside by being covered. In addition to this, the present invention includes a frame and chassis that are covered with an externally prepared external component so that the frame and chassis are not exposed to the outside.

(13) In each of the above-described embodiments, the chassis and the frame constituting the appearance member are made of metal. However, the present invention is also applicable to the case where either one or both of the chassis and the frame is made of synthetic resin. include. This configuration is preferably adopted for small and medium-sized models that do not have high mechanical strength required for liquid crystal display devices.

(14) In each of the above embodiments, the flexible substrate is configured to be connected only to one long side end portion of the liquid crystal panel. The present invention can also be applied to a connected configuration.

(15) In addition to the above (14), the flexible substrate is connected to only one short side end of the liquid crystal panel, or the flexible substrate is connected to both short side ends of the liquid crystal panel. Or a configuration in which the flexible substrate is connected to each end of any three sides of the liquid crystal panel, or a configuration in which the flexible substrate is connected to each end of the four sides of the liquid crystal panel. The present invention can also be applied to those.

(16) In each of the above-described embodiments, the power supply board is provided with the function of supplying power to the LEDs. However, the LED drive board that supplies power to the LEDs is made independent of the power supply board. Are also included in the present invention.

(17) In the above-described embodiments, the main board is provided with the tuner section. However, the present invention includes a tuner board having the tuner section that is independent from the main board.

(18) In each of the above-described embodiments, the color portion of the color filter included in the liquid crystal panel is exemplified as three colors of R, G, and B. However, the color portion may be four or more colors.

(19) In each of the embodiments described above, an LED is used as the light source, but other light sources such as an organic EL can be used.

(20) 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.

(21) In each of the embodiments described above, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified, but the present invention is also applicable to a display device using another type of display panel.

(22) In each of the above-described embodiments, the television receiver provided with the tuner unit is illustrated, but the present invention is also applicable to a display device that does not include the tuner unit.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device) 11, 111, 211, 311 ... Liquid crystal panel (display panel), 11c, 111c, 211c ... Display surface, 13 ... Frame (holding part), 14 ... Chassis (holding part), 15, 115, 215, 315, 415 ... optical member, 15EP, 215EP, 315Ep ... end side part, 16, 216, 316, 416 ... light guide plate, 16EP, 216EP, 316EP ... end side part, 17 ... LED (light source) , 23, 323, 423 ... light guide plate support, 28, 128, 328, 428 ... optical member housing recess, 28a, 128a ... side surface (inner surface), 28b ... ceiling surface (inner surface), 29, 129, 329, 429 ... Optical member support surface, 30 ... light-shielding portion, 31,431 ... bottom, 31a, 431a ... inner surface, C1 ... clearance, C2 ... clearance, HM ... maintenance Member, TV ... television receiver

Claims (15)

A light source;
A display panel that performs display using light of the light source;
The display panel is arranged so as to overlap the display surface side opposite to the display panel, the end face is arranged to face the light source, and the end portion is arranged outside the end of the display panel. A light guide plate,
An optical member disposed in a form sandwiched between the display panel and the light guide plate and having an end portion overlapping the end portion of the light guide plate;
A holding member configured to hold the display panel and the light guide plate so as to be sandwiched from the display surface side and the opposite side, and to hold the light source between the pair of holding portions; ,
A light guide plate support portion that protrudes from the holding portion disposed on the display surface side of the pair of the holding portions to the light guide plate side and supports the end side portion of the light guide plate from the display surface side. And a light guide plate support part formed by cutting out an optical member housing recess for housing the end of the optical member. The display device according to claim 1, wherein a clearance is provided between an inner surface of the optical member housing recess and an end surface of the optical member. 3. A display device according to claim 2, wherein a clearance is provided between an inner surface of the optical member housing recess and a surface on the display surface side at the end of the optical member. The light guide plate support portion is disposed so as to support a portion facing the light source in the end portion of the light guide plate and to be interposed between the light source and an end portion of the display panel. The display device according to any one of claims 1 to 3. The optical member is arranged in a form in which a plurality of the optical members are stacked on each other,
The display device according to claim 1, wherein each of the plurality of optical members has an end portion accommodated in the optical member accommodating recess. 6. The optical member support surface according to claim 1, wherein an optical member support surface capable of supporting the display surface side surface of the end portion of the optical member is provided on the inner surface of the optical member housing recess. The display device described. The light guide plate support portion is configured to extend along a side of the end portion of the optical member, and the optical member receiving recess is formed to receive the end portion of the optical member over the entire length. The display device according to claim 1. The light guide plate support portion is formed in a frame shape so as to support the end portion of the light guide plate over the entire circumference, and the optical member receiving recess is formed so as to receive the outer peripheral end portion of the optical member over the entire circumference. The display device according to claim 7. The display device according to any one of claims 1 to 8, wherein a light-shielding portion that blocks light emitted from the end-side portion of the light guide plate is formed in the end-side portion of the optical member. The optical member is arranged in a form in which a plurality of the optical members are stacked on each other,
The display device according to claim 9, wherein the light-shielding portion is selectively formed on the optical member arranged closest to the light guide plate among the plurality of optical members. The light shielding portion includes at least a portion of the optical member that is accommodated in the optical member accommodating recess, and a portion that is disposed between the light guide plate support portion and an end surface of the display panel as viewed from the display surface side. The display device according to claim 9 or 10, wherein the display device is formed over a wide range. The display device according to any one of claims 1 to 11, wherein the light guide plate support portion is formed such that the optical member housing recess is open toward the light guide plate side. The said light guide plate support part has a bottom part interposed between the said edge part of the said optical member accommodated in the said optical member accommodation recessed part, and the said light guide plate, The any one of Claim 1-11 The display device according to item. Whereas the plurality of optical members are arranged in a stacked manner, the light guide plate support portion has an inclined inner surface of the bottom portion and each of the plurality of optical members in the optical member receiving recess. The display device according to claim 13, wherein the display is formed so that the end is accommodated. A television receiver comprising the display device according to any one of claims 1 to 14.

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