WO2013047367A1

WO2013047367A1 - Display device and television receiving device

Info

Publication number: WO2013047367A1
Application number: PCT/JP2012/074219
Authority: WO
Inventors: 健太郎鎌田; 敏之明星
Original assignee: シャープ株式会社
Priority date: 2011-09-28
Filing date: 2012-09-21
Publication date: 2013-04-04

Abstract

A display device (10) according to the present invention comprises: a light guide plate (16) having a light incident surface (16b) and a light emitting surface (16a); a light source (17) for emitting light toward the light incident surface (16b); a light source substrate (18) having the light source (17) mounted on the front-side board surface (18a) such that the light source (17) is placed facing the light incident surface (16b) at a prescribed distance; a sheet-like optical member (15) placed so as to overlap the light guide plate (16) with a peripheral edge portion (115) extending outside the light incident surface (16b); a light shield layer (5) provided on the peripheral edge portion (115) of the optical member (15); a liquid crystal panel (11) placed so as to overlap the optical member (15) with an end portion (11c) retracted inside the peripheral edge portion (115) of the optical member (15); and a frame body (13) brought in contact with the front-side board surface at the peripheral edge portion of the liquid crystal panel (11) while clamping the liquid crystal panel (11) between the frame body (13) and said light guide plate (16).

Description

Display device and television receiver

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

Liquid crystal panels are used in display devices such as televisions, mobile phones, and portable information terminals. The liquid crystal panel needs to use external light in order to display an image. Therefore, as shown in Patent Document 1, this type of display device includes a liquid crystal panel and an illumination device (so-called backlight device) for supplying light to the liquid crystal panel. This illuminating device is arranged on the back side of the liquid crystal panel, and is configured to irradiate the light spread in a planar shape toward the back side of the liquid crystal panel.

In the display device, the liquid crystal panel is generally supported by a frame (see, for example, Patent Document 1). This frame is made of a frame-shaped resin molded product, and the peripheral edge portion of the liquid crystal panel is supported by the inner edge portion thereof. The liquid crystal panel is arranged on the front side of the lighting device described above while being supported by the frame.

By the way, in recent years, a display device in which the above-mentioned frame supporting the liquid crystal panel is abolished has been proposed in response to requests for reduction in manufacturing cost and further reduction in thickness. Specifically, a display device that supports a liquid crystal panel directly on a lighting device without using the frame has been studied.

JP 2010-22001 A

(Problems to be solved by the invention)
However, in the display device in which the frame is eliminated, there is a problem in that light from the illumination device not only leaks from the back surface of the liquid crystal panel but also strikes the end surface of the liquid crystal panel. When light hits the end face of the liquid crystal panel, the light enters from the end face toward the inside (center side), and an unnecessarily high brightness portion (hereinafter referred to as display defect) is formed on the display face of the liquid crystal panel. . This display defect has a shape extending from the end face of the liquid crystal panel toward the inside (center side), and even when the liquid crystal panel displays a black image entirely, It is a problem because it appears.

An object of the present invention is to provide a display device in which display defects of a liquid crystal panel due to leaked light are suppressed, and a television receiver provided with the display device.

(Means for solving the problem)
The display device according to the present invention is a plate-shaped member, and includes a light incident surface on which light is incident and is formed of at least one end surface of the plate-shaped member, and a plate surface on the front side of the plate-shaped member. A light guide plate that emits light incident from a surface; a light source that emits light toward the light incident surface; and the light source is mounted on a front plate surface; A light source substrate disposed so as to face the light incident surface with a predetermined distance therebetween, and a peripheral portion protruding outside the light incident surface so as to overlap the light guide plate A sheet-like optical member, a light shielding layer provided at the peripheral portion of the optical member, and an end portion of the optical member so as to overlap with the optical member in a state where the end portion enters the inner side of the peripheral portion. On the liquid crystal panel and the front surface of the liquid crystal panel Together addressed to Waru in kicking peripheral portion, and a frame body sandwiched between the liquid crystal panel the light guide plate. In the illuminating device, an end portion of the liquid crystal panel enters an inner side than the peripheral portion of the optical member. And the said light shielding layer is provided in the said peripheral part of the said optical member. Therefore, even if light is emitted from the light source, the light is blocked by the light shielding layer, and light is prevented from entering from the end of the liquid crystal panel.

In the display device, the optical member may be formed of a laminate of a plurality of optical sheets, and the light shielding layer may be provided only on a part of the plurality of optical sheets forming the laminate.

In the display device, the light-shielding layer may be provided on a liquid crystal panel that is disposed closest to the liquid crystal panel among the plurality of optical sheets forming the laminate. By providing the light shielding layer on the optical sheet disposed closest to the liquid crystal panel, the light shielding layer can be brought closer to the end of the liquid crystal panel. As a result, the light blocking layer prevents light from entering the end of the liquid crystal panel.

In the display device, the light shielding layer may be formed on a back surface facing the light emitting surface side of the peripheral portion of the optical member. If the light shielding layer is formed on the back surface of the optical member facing the light emitting surface, the light is also prevented from entering the peripheral portion of the optical member.

In the display device, the light shielding layer may be further provided on an end surface of the peripheral portion of the optical member. When the light shielding layer is provided on the end surface of the peripheral portion of the optical member, it is possible to prevent light from entering the optical member from the end surface.

In the display device, the light shielding layer may be provided in the vicinity of the light source so as to correspond to an installation location of the light source. By providing the light shielding layer only in the vicinity of the light source so as to correspond to the installation location of the light source, unnecessary absorption of light from the light source by the light shielding layer is suppressed.

In the display device, the light shielding layer may be made of a light shielding tape. When the light shielding tape is used as the light shielding layer, the productivity of the light shielding layer is improved.

In the display device, the light source may include a light emitting diode.

The display device may include a chassis disposed on a plate surface side on the back side of the light guide plate.

In the display device, the frame may be configured to sandwich the light guide plate, the optical member, and the liquid crystal panel with the chassis.

A television receiver according to the present invention includes the display device.

(The invention's effect)
ADVANTAGE OF THE INVENTION According to this invention, the display apparatus with which the display defect of the liquid crystal panel resulting from leaked light was suppressed, and the television receiver provided with this display apparatus can be provided.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Rear view of TV receiver Partial sectional view showing a part of the sectional configuration along the short side direction of the liquid crystal display device FIG. 9 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device according to the second embodiment. FIG. 10 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device according to the third embodiment. FIG. 9 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device according to the fourth embodiment. FIG. 9 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device according to the fifth embodiment. FIG. 7 is a plan view showing the main configuration of a liquid crystal display device according to Embodiment 6.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3. In the present embodiment, the television receiver TV and the liquid crystal display device 10 are illustrated. In each drawing, an X axis, a Y axis, and a Z axis are shown, and each axis direction is drawn to be a common direction in each drawing. Also, the upper side shown in FIG. 3 is the front side, and the lower side is the back side.

FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver TV according to Embodiment 1 of the present invention, and FIG. 2 is a rear view of the television receiver TV. As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display unit LDU, various substrates PWB, MB, CTB attached to the back side (back side) of the liquid crystal display unit LDU, and liquid crystal A cover member CV attached to cover the various substrates PWB, MB, CTB and a stand ST are provided on the back side of the display unit LDU. The liquid crystal display unit LDU is supported by the stand ST so that its display surface is along the vertical direction (Y-axis direction).

The liquid crystal display device 10 according to the present embodiment is configured 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. The liquid crystal display unit LDU has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source. It is the structure hold | maintained integrally by the outer frame (frame body) 13 and the chassis 14 which comprise.

On the back surface of the chassis 14 constituting the external appearance of the back side of the liquid crystal display device 10, as shown in FIG. 2, two stand mounting members STA extending along the Y-axis direction are spaced apart in the X-axis direction. A pair is attached. These stand attachment members STA have a substantially channel shape with a cross-sectional shape opened 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 is configured. In addition, the wiring member (electric wire etc.) connected to the LED board 18 which the backlight apparatus 12 has passes through the space in the stand attachment member STA. The stand ST includes a pedestal portion STa that extends along the X-axis direction and the Z-axis direction, and a pair of support columns STb that rise from the pedestal portion STa along the Y-axis direction. The cover member CV is made of synthetic resin, and is attached so as to cover the lower half (see FIG. 2) on the back surface of the chassis 14 while traversing the pair of stand attachment members STA in the X-axis direction. Between the cover member CV and the chassis 14, a space capable of accommodating components such as various substrates PWB, MB, and CTB described later is formed.

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 is a power supply source of the liquid crystal display device 10 and supplies driving power to the other substrates MB and CTB, the LEDs 17 included in the backlight device 12, and the like. The main board MB has a tuner section (not shown) that can receive a television signal and an image processing section (not shown) that performs image processing on the received television signal, and sends the processed image signal to the control board CTB. Output. 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). The processed signal is output to the control board CTB. The control board CTB has a function of supplying an image signal input from the main board MB to the liquid crystal panel 11 as a liquid crystal driving signal.

FIG. 3 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device 10. As shown in FIG. 3, the liquid crystal display unit LDU constituting the liquid crystal display device 10 has main components of an outer frame (front frame) 13 arranged on the front side and a chassis (rear side) arranged on the back side. (Chassis) 14. Main components sandwiched between the frame 13 and the chassis 14 include at least a liquid crystal panel 11, an optical member 15, a light guide plate 16, and an 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 by the front frame 13 and the back chassis 14 in a stacked state. The backlight device 12 mainly includes an optical member 15, a light guide plate 16, an LED unit LU, and a chassis 14. The LED unit LU is arranged between the frame 13 and the chassis 14 so as to be along the end surface on the long side of the light guide plate 16. The LED unit LU includes an LED 17 that is a light source and an LED substrate (light source substrate) 18 on which the LED 17 is mounted.

The liquid crystal panel 11 has a horizontally long rectangular shape as a whole, and a pair of glass substrates excellent in translucency are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the two substrates. The configuration is made. One substrate (array substrate) is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, and an alignment film. Yes. The other substrate (color filter substrate, hereinafter referred to as CF substrate) has a color filter (CF) or counter electrode in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, Furthermore, an alignment film or the like is provided.

The liquid crystal panel 11 is placed on the front side of the optical member 15 so as to be laminated, and the back surface (the outer surface of the polarizing plate on the back side) is in close contact with the optical member 15 with almost no gap. Thereby, it is possible to prevent dust and the like from entering between the liquid crystal panel 11 and the optical member 15. The display surface 11a of the liquid crystal panel 11 includes an area where an image can be displayed on the center side of the screen and a non-display area having a frame shape (frame shape) surrounding the display area on the outer peripheral edge side of the screen. . The liquid crystal panel 11 is connected to a control board CTB via a driver component for driving liquid crystal or a flexible board, and an image is displayed in a display area on the display surface 11a based on a signal input from the control board CTB. It has become so. A polarizing plate is disposed on the outside of both substrates. Further, the end portion 11c of the liquid crystal panel 11 is disposed so as to overlap the optical member 15 in a state of entering an inner side of a peripheral portion 115 of the optical member 15 described later.

The optical member 15 has a horizontally long rectangular shape as a whole, like the liquid crystal panel 11. The size (short side dimension and long side dimension) of the optical member 15 is set to be substantially the same as the front surface 16 a of the liquid crystal panel 11 and the light guide plate 16. The optical member 15 is placed on the front side (light emitting side) of the light guide plate 16 in a stacked manner. Further, the optical member 15 is arranged in a state of being sandwiched between the liquid crystal panel 11 and the light guide plate 16. In the case of this embodiment, the optical member 15 consists of a laminate of three optical sheets. Specifically, it consists of a laminate of a diffusion sheet 15a, a lens sheet 15b, and a reflective polarizing sheet 15c. As shown in FIG. 3, among these optical sheets, the diffusion sheet 15a is disposed on the lowermost side, and the reflective polarizing sheet 15c is disposed on the uppermost side. As will be described later, the optical sheet 15c disposed on the uppermost side among the optical sheets constituting the optical member 15 is set to a size such that the peripheral portion protrudes outside the light incident surface 16b of the light guide plate 16. Has been. And the light shielding layer 5 is formed in the peripheral part of the optical sheet 15c.

The light shielding layer 5 is provided in a portion 115 that protrudes outside the light incident surface 16a of the light guide plate 16 in the peripheral portion of the optical member. The protruding portion 115 is disposed so as to cover the gap formed between the LED 17 and the light incident surface 16a from above (front side). The protruding portion 115 has a size and the like so that it does not come into contact with the LED unit LU and the frame 13 even when the optical member 15 is thermally expanded. In the case of this embodiment, the light shielding layer 5 is provided on the back surface side of the protruding portion 115. The light blocking layer 5 is black and has a property of absorbing and blocking light emitted from the LED 17. As the light-shielding layer 5, for example, a black paint film made of a black paint film (applied product) or a black tape (light-shielding tape) having an adhesive layer on one side is used. The light shielding layer 5 of this embodiment consists of a black light shielding tape provided with an adhesive layer on one side. It is preferable to use a light shielding tape as the light shielding layer 5 because the light shielding layer 5 can be easily formed and workability (productivity) is improved. The light shielding layer 5 has a size (a width in the Y-axis direction and a width in advance) so that light directed from the LED 17 toward the end portion (end surface) of the liquid crystal panel 11 can be shielded even when the optical member 15 is thermally expanded. X-axis direction length) is set. In the case of this embodiment, the light shielding layer 5 is provided on each of two sides on the long side of the rectangular optical member 15 (optical sheet c). The light shielding layer 5 is provided linearly (continuously) along each side.

The light guide plate 16 is made of a synthetic resin (for example, acrylic resin or polycarbonate such as PMMA) having a refractive index sufficiently higher than air and substantially transparent (excellent translucency). Like the liquid crystal panel 11 and the optical member 15, the light guide plate 16 has a horizontally long rectangular shape when viewed in plan and has a plate shape that is thicker than the optical member 15. In each drawing, the light guide plate 16 has a long side direction on the plate surfaces 16a and 16c coinciding with the X-axis direction, a short side direction on the plate surfaces 16a and 16c coincides with the Y-axis direction, and the plate surface The thickness direction (thickness direction) orthogonal to 16a and 16c is drawn so as to coincide with the Z-axis direction. The light guide plate 16 is disposed so as to overlap the back side of the optical member 15, and is sandwiched between the optical member 15 and the chassis 14. The light guide plate 16 is provided with an LED unit LU along the long side direction, and light from the LED 17 is introduced into an end face in the long side direction. The light guide plate 16 has a function of rising and emitting light toward the optical member 15 side (front side) while propagating light from the LED 17 introduced from the end face inside.

Of the plate surfaces of the light guide plate 16, a front-side plate surface (a surface facing the optical member 15) 16 a is a light emitting surface 16 a that emits internal light toward the optical member 15 and the liquid crystal panel 11. Of the four end faces surrounding the plate surface of the light guide plate 16, both end faces 16 b on the long side extending in the X-axis direction are opposed to the LEDs 17 (LED substrates 18) respectively with a predetermined interval. These are the light incident surfaces 16b on which the light emitted from the LEDs 17 is incident. The light incident surface 16b is a surface extending along the X-axis direction and the Z-axis direction (the plate surface of the LED substrate 18), and is substantially orthogonal to the light emitting surface 16a. Further, the alignment direction of the LED 17 and the light incident surface 1b coincides with the Y-axis direction.

As shown in FIG. 3, the light emitted from the plate surface 16c to the outside on the back side is reflected on the plate surface 16c on the back side of the light guide plate 16 (that is, the plate surface opposite to the light emission surface 16a). A reflection sheet 19 that can be raised to the front side is provided so as to cover substantially the entire area. The reflection sheet 19 is disposed between the chassis 14 and the light guide plate 16. The reflection sheet 19 is made of a synthetic resin, and a surface having a white surface with excellent light reflectivity is used. The reflection sheet 19 is set to be approximately the same size as the plate surface of the light guide plate 16. It should be noted that at least one of the light exit surface 16a of the light guide plate 16 and the plate surface 16c on the opposite side thereof is a reflective portion (not shown) that reflects internal light or a scattering portion (not shown) that scatters internal light. ) Is patterned with a predetermined in-plane distribution, and thereby, the emitted light from the light emitting surface 16a is controlled to have a uniform distribution in the surface.

Next, the LED 17 and the LED substrate 18 constituting the LED unit LU will be described. As shown in FIG. 3, the LED 17 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. 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 appropriately combined, or any one of them alone. Used in The LED 17 is a so-called top type in which a surface opposite to the mounting surface with respect to the LED substrate 18 is a light emitting surface.

As shown in FIG. 3, the LED substrate 18 has an elongated plate shape (long 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 plate surface is arranged in the space between the frame 13 and the chassis 14 in a posture along the X-axis direction and the Z-axis direction (that is, a posture aligned in parallel with the light incident surface 16b of the light guide plate 16). Has been. The LED 17 having the above-described configuration is surface-mounted on a front surface of the LED substrate 18 (that is, a surface facing the light guide plate 16), and this surface is a mounting surface 18a. A plurality of LEDs 17 are arranged in a straight line on the mounting surface 18a of the LED substrate 18 along the length direction (X-axis direction) with a predetermined interval. A plurality of LEDs 17 are intermittently arranged in parallel at both ends on the long side of the backlight device 12 along the long side direction. The distance between the LEDs 17 adjacent in the X-axis direction (that is, the arrangement pitch of the LEDs 17) is set to be approximately equal. Note that the arrangement direction of the LEDs 17 coincides with the length direction (X-axis direction) of the LED substrate 18. The mounting surface 18a of the LED substrate 18 extends along the X-axis direction, and crosses each LED 17, and connects adjacent LEDs 17 in series. The wiring pattern is made of a metal film (copper foil or the like). (Shown) is formed. 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. The base material of the LED substrate 18 is made of, for example, a metal made of aluminum or the like, and the wiring pattern described above is formed on the surface thereof via an insulating layer. A solder resist layer is formed on the insulating layer to protect the wiring pattern. In addition, as a base material of the LED board 18, you may use insulating materials, such as a ceramic.

The frame (frame body) 13 has a frame shape (frame shape) surrounding the display surface 11a of the liquid crystal panel 11 (see FIG. 1), and is made of a metal material having excellent heat dissipation such as aluminum. The frame 13 includes a frame-shaped front surface portion 13a disposed on the front side (front side) of the liquid crystal display unit LDU (liquid crystal display device 10) and a frame-shaped peripheral wall surrounding the liquid crystal display unit LDU (liquid crystal display device 10). Part 13b.

The inner edge portion of the frame-shaped front surface portion 13a presses the peripheral edge portion of the liquid crystal panel 11 from the front surface side. Then, the front surface portion 13 a presses a laminate composed of the liquid crystal panel 11, the optical member 15, the light guide plate 16, and the reflection sheet 19 toward the chassis 14. A peripheral wall portion 13b is provided on the outer edge portion of the front surface portion 13a. The peripheral wall portion 13b extends from the front surface portion 13a toward the chassis 14 and surrounds the liquid crystal panel 11, the light guide plate 16, the LED unit LU, and the like. As shown in FIG. 3, the cross-sectional structures of the front surface portion 13a and the peripheral wall portion 13b are substantially L-shaped. An LED unit LU is attached to the inside of the peripheral wall portion 13b. The LED unit LU is attached to the frame 13 with the plate surface 18b on the back side of the LED substrate 18 in contact with the wall surface (inner peripheral surface) of the peripheral wall portion 13b. The LED unit LU is fixed to the frame 13 using screws or the like. In the present embodiment, the frame 13 also functions as a heat radiating member for releasing the heat generated from the LEDs 17 to the outside. Thus, when the frame 13 is provided with a heat dissipation function, it is not necessary to prepare a separate heat dissipation member, and the manufacturing cost can be suppressed.

The chassis 14 has a horizontally long rectangular shape, and is disposed on the back side of the liquid crystal display unit LDU (liquid crystal display device 10) so as to cover the plate surface 16c on the back side of the light guide plate 16. The chassis 14 is a plate-like member made of a metal material such as aluminum, and is formed, for example, into a predetermined shape using a mold. The chassis 14 is in close contact with the plate surface 16 on the back side of the light guide plate 16 via a reflection sheet 19. The end portion of the chassis 14 projects outward from the light incident surface 16 b of the light guide plate 16 and is in contact with the peripheral wall portion 13 b of the frame 13. The frame 13 and the chassis 14 are fixed to each other using screws or the like.

When the power supply of the liquid crystal display device 10 (television receiver TV) configured as described above is turned on, power is supplied from the power supply substrate PWB, and various signals are supplied from the control substrate CTB to the liquid crystal panel 11 and driven. Are controlled, and each LED 17 of the LED unit LU is driven. When each LED 17 is driven and light is emitted from each LED 17, light L 1 (see FIG. 3) is incident on the inside from the light incident surface 16 a of the light guide plate 16. The incident light is reflected by the reflection sheet 19 or the like laid on the back side of the light guide plate 16 and proceeds to the optical member 15 from the front side plate surface (light emitting surface) 16a while proceeding through the light guide plate 16. It is emitted toward. The emitted light passes through the optical member 15 and becomes light spread in a planar shape, and illuminates the back surface 11 b of the liquid crystal panel 11. The liquid crystal panel 11 displays an image on the display surface 11a by using the light spread in a planar shape.

Incidentally, in the light emitted from the LED 17, there is also light L 2 that travels obliquely upward toward the end of the liquid crystal panel 11 without proceeding toward the light incident surface 16 a of the light guide plate 16. The light L 2 is so-called leakage light and can cause display defects in the liquid crystal display device 10. However, as described above, since the light shielding layer 5 is provided in the peripheral portion 115 of the optical member 15 in the liquid crystal display device 10 of the present embodiment, the light L2 is blocked by the light shielding layer 5. Therefore, the light L 2 emitted from the LED 17 is prevented from entering from the end portion (circumferential end surface) of the liquid crystal panel 11 toward the inner side (center side) of the liquid crystal panel 11. Therefore, it is possible to suppress the occurrence of display defects due to leaked light on the display surface 11a of the liquid crystal display device 10.

Further, in the case of the present embodiment, the light shielding layer 5 is provided on the peripheral portion 115 of the optical sheet 15c arranged on the uppermost side among the three optical sheets constituting the optical member 15. The optical sheet 15 c is disposed closest to the end of the liquid crystal panel 11. Thus, by providing the light shielding layer 5 on the optical sheet 15c closest to the end of the liquid crystal panel 11, the light L2 directed toward the end (end face) of the liquid crystal panel 11 can be reliably blocked.

In the case of the present embodiment, the light shielding layer 5 is formed on the back side (back surface) of the peripheral portion 115 of the optical member 15 (optical sheet 15c). Thus, when the light shielding layer 5 is provided on the back surface of the optical member 15, the light that enters the optical member 15 unnecessarily can be blocked by the light shielding layer 5. The optical member 15 is set so as to adjust the light emitted from the light emitting surface 16a of the light guide plate 16 in the first place. That is, it is set to adjust light crossing the optical member 15 from the back side toward the front side. For this reason, if the light emitted from the LED 17 directly enters from the end of the optical member 15, display failure (luminance unevenness) may occur due to the incident light. In particular, when the peripheral portion 115 of the optical member 15 protrudes outside the light incident surface 16 a of the light guide plate 16, light easily enters the optical member 15 directly from the protruding portion 115. In addition, when the optical sheet is a lens sheet, when light enters an end portion, the light appears as stripes, which is a particular problem. However, as described above, in the case of the present embodiment, the light shielding layer 5 is formed on the back side (back surface) of the peripheral portion 115 of the optical member (optical sheet 15c). It can block the light that enters unnecessarily.

<Embodiment 2>
The second embodiment of the present invention will be described below with reference to FIG. In the following embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted. FIG. 4 is a partial cross-sectional view illustrating a part of a cross-sectional configuration along the short side direction of the liquid crystal display device 10A according to the second embodiment. The liquid crystal display device 10A (liquid crystal display unit LDU) of the present embodiment has the same basic configuration as the liquid crystal display device 10 of the first embodiment. However, in the case of this embodiment, the light shielding layer 5A is provided on the front side, not on the back side of the peripheral portion 115 of the optical member 15 (optical sheet 15c). This is different from the case of the first embodiment. As described above, the light shielding layer 5 A may be formed on the front side of the peripheral portion 115 of the optical member 15. Also in the liquid crystal display device 10 A of the present embodiment, the light L 2 emitted from the LED 17 is suppressed from entering from the end portion (circumferential end surface) of the liquid crystal panel 11 toward the inner side (center side) of the liquid crystal panel 11. Therefore, it is possible to suppress the occurrence of display defects due to leaked light on the display surface 11a of the liquid crystal display device 10A.

<Embodiment 3>
Hereinafter, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 5 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device 10B according to the third embodiment. The liquid crystal display device 10B (liquid crystal display unit LDU) of the present embodiment has the same basic configuration as the liquid crystal display device 10 of the first embodiment. However, in the case of the present embodiment, among the three layers of the

optical sheets

15a, 15b, and 15c constituting the optical member 15B, the lowermost optical sheet 15a is outside the light incident surface 16a of the light guide plate 16. The light shielding layer 5B is provided on the protruding portion 115B. The light shielding layer 5B is formed on the back side (back surface) of the peripheral portion 115B of the optical member 15 (optical sheet 15a). Also in the liquid crystal display device 10 B of this embodiment, the light L 2 emitted from the LED 17 is suppressed from entering from the end portion (circumferential end surface) of the liquid crystal panel 11 toward the inside (center side) of the liquid crystal panel 11. Therefore, it is possible to suppress the occurrence of display defects due to leakage light on the display surface 11a of the liquid crystal display device 10B.

<Embodiment 4>
Embodiment 4 of the present invention will be described below with reference to FIG. FIG. 6 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device 10C according to the fourth embodiment. The liquid crystal display device 10C (liquid crystal display unit LDU) of the present embodiment has the same basic configuration as the liquid crystal display device 10 of the first embodiment. However, in the case of this embodiment, the light shielding layer 5C is different from the case of Embodiment 1 in that it is formed not only on the back side of the peripheral portion 115 of the optical member 15 (optical sheet 15c) but also on the end face thereof. Yes. The light shielding layer 5 C is made of a light shielding tape, and is attached along the peripheral portion of the optical member 15. A light shielding tape having a predetermined width is first attached to the back surface of the peripheral portion 115 of the optical member 15 (optical sheet 15c), and then the portion of the light shielding tape that protrudes outward from the peripheral portion 115 is folded back to the optical member 15 (optical sheet). By sticking to the end face of 15c), the light shielding layer 5C of the present embodiment is obtained. As described above, the back side of the peripheral portion 115 may be shielded by the light shielding layer 5C, and the end surface of the optical member 15 (optical sheet 15c) may be shielded. Also in the liquid crystal display device 10 C of the present embodiment, the light L 2 emitted from the LED 17 enters from the end portion (circumferential end surface) of the liquid crystal panel 11 toward the inner side (center side) of the liquid crystal panel 11 as in the first embodiment. It is suppressed. Therefore, it is possible to suppress the occurrence of display defects due to leakage light on the display surface 11a of the liquid crystal display device 10C. Furthermore, in the case of this embodiment, the end surface in the peripheral part of the optical member 15 (optical sheet 15c) is light-shielded by the light shielding layer 5C. Therefore, in this embodiment, the light entering from the end face of the optical member 15 (optical sheet 15c) to the inside can be blocked by the light blocking layer 5C. Although the thickness of the optical sheet 15c is set to be small (thin), light (leakage light) may enter inward slightly from the end face of the optical sheet 15c. In the present embodiment, a light shielding layer 5C is provided on the end surface of the optical sheet 15c in order to block such light.

<Embodiment 5>
Hereinafter, Embodiment 5 of the present invention will be described with reference to FIG. FIG. 7 is a partial cross-sectional view showing a part of a cross-sectional configuration along the short side direction of the liquid crystal display device 10D according to the fifth embodiment. The liquid crystal display device 10D (liquid crystal display unit LDU) of the present embodiment has the same basic configuration as the liquid crystal display device 10 of the first embodiment. However, in the case of the present embodiment, the LED unit LU is different from the case of the first embodiment in that the LED unit LU is fixed to the chassis 14 and the frame 13D (frame body) while being attached to the heat dissipation member 20. . The heat radiating member 20 is made of a metal material having excellent heat radiating properties such as aluminum. The heat dissipating member 20 includes a support portion 20b that supports the LED substrate 18 of the LED unit LU, and an attachment portion 20a that is attached to the chassis 14, and the support portion 20b has an elongated plate shape, 18 is supported from the back surface 18b side. An attachment portion 20a is provided at the base (lower end) of the support portion 20b. The attachment portion 20a has an elongated plate shape, and extends toward the back of the support portion 20b (on the side opposite to the LED 17). The heat radiating member 20 provided with such a support portion 20b and the attachment portion 20a is arranged along the long side direction of the light guide plate 16. The heat radiating member 20 is fixed to the chassis 14 in a state where the mounting portion 20 a is placed on the plate surface of the chassis 14.

The frame 13D includes a frame-shaped front surface portion 13Da arranged on the front side (front surface side) of the liquid crystal display device 10D and a frame-shaped peripheral wall portion 13Db surrounding the liquid crystal display device 10D. In the case of this embodiment, the peripheral wall portion 13Db is partially larger in thickness (thickness in the Y-axis direction) than that of the first embodiment. The thick portions of the peripheral wall portion 13Db are respectively directed to the surfaces of the support portion 20b and the attachment portion 20a of the heat dissipation member 20. The frame 13 D is made of a metal material such as aluminum that is excellent in heat dissipation, like the heat dissipation member 20. The frame 13 D sandwiches a laminate composed of the reflection sheet 19, the light guide plate 16, the optical member 15, and the liquid crystal panel 11 with the chassis 14. In the liquid crystal display device 10D of this embodiment, the heat generated with the light emission of the LED 17 moves to the chassis 14 and the frame 13D via the LED substrate 18 and the heat dissipation member 20, and further from the chassis 14 and the frame 13D to the outside air. Released. As in the present embodiment, the LED unit LU may be supported by the heat dissipation member 20.

In the liquid crystal display device 10D of the present embodiment, the light shielding layer 5 is formed on the peripheral portion 115 of the optical member 15 as in the first embodiment. Also in the liquid crystal display device 10 D of the present embodiment, the light L 2 emitted from the LED 17 is suppressed from entering from the end portion (circumferential end surface) of the liquid crystal panel 11 toward the inside (center side) of the liquid crystal panel 11. Therefore, it is possible to suppress the occurrence of display defects due to leakage light on the display surface 11a of the liquid crystal display device 10D.

<Embodiment 6>
Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a plan view showing the main configuration of the liquid crystal display device according to the sixth embodiment. FIG. 8 shows the liquid crystal display device 10E with the frame, chassis, and the like removed for convenience of explanation. In the liquid crystal display device 10 of the first embodiment, the light shielding layer 5 is provided on the peripheral portion 115 of the optical member 15 in a state of being connected straight along the longitudinal direction (long side direction). In the embodiment, the light shielding layer 5E is formed only in the vicinity of the portion where the LED 17 is provided in the peripheral portion 115 of the optical member 15. That is, the light shielding layer 5E may be provided intermittently along the long side direction (light incident surface 16c) of the light guide plate 16 in correspondence with the arrangement state of the LEDs 17. As described above, the light shielding layer 5 may be selectively provided only in a necessary portion to suppress unnecessary absorption of light emitted from the LED 17 by the light shielding layer.

<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) The liquid crystal display device of each of the embodiments described above has a configuration in which the LED units LU are arranged along the two long sides of the light guide plate 16, but in other embodiments, the liquid crystal display device is limited to this. For example, the LED unit LU may be arranged along only one long side of the light guide plate 16. In another embodiment, the LED unit LU may be arranged along one or two short sides. In addition, the position of the light shielding layer 5 provided in the optical member 15 is appropriately set according to the arrangement of the LED units LU.

(2) In the liquid crystal display device of each of the embodiments described above, the end 11c of the liquid crystal panel 11 is set at substantially the same position as the end of the light guide plate 16, but in other embodiments, the end of the liquid crystal panel 11 The end portion 11c may be configured to protrude outward from the end face (light incident surface 16c) of the light guide plate 16, or conversely, the end portion 11c of the liquid crystal panel 11 may be the end face (light incident surface) of the light guide plate 16. 16c) may enter inside. However, in any case, the end portion 11c of the liquid crystal panel 11 needs to enter inside the end portion 115 of the optical member 15 on which the light shielding layer 5 is provided.

(3) When the light shielding layer 5 is formed on the peripheral portion 115 of the optical member 15, for example, a black paint is applied (printed) on the peripheral portion 115 of the optical member 15 using a known printing device. Also good. Alternatively, the light shielding layer 5 may be formed by applying a black paint to the peripheral portion 115 of the optical member 15 using a brush or the like.

(4) In the first embodiment, the television receiver TV is exemplified as the display device. However, in other embodiments, the liquid crystal display device may be used for, for example, a mobile phone or a portable information terminal. In another embodiment, a display device that does not include a tuner unit may be used.

(5) In the first embodiment, the color filters of the color filter included in the liquid crystal panel 11 are exemplified by three colors R, G, and B. However, in other embodiments, the color sections are set to four or more colors. Also good. In another embodiment, a liquid crystal display device that performs monochrome display may be used.

(6) In Embodiment 1 described above, a TFT is used as a switching element of a liquid crystal display device, but in other embodiments, a switching element other than a TFT (for example, a thin film diode (TFD)) may be used.

(7) In the first embodiment, the LED 17 is used as the light source. However, in other embodiments, other light sources such as a cold cathode tube may be used.

10, 10A, 10B, 10C, 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel, 11a ... Display surface, 11b ... Back surface, 11c ... End of liquid crystal panel, 12 ... Backlight device (illumination device), DESCRIPTION OF

SYMBOLS

13, 13D ... Frame, 14 ... Chassis, 15 ... Optical member, 15a, 15b, 15c ... Optical sheet, 16 ... Light guide plate, 16a ... Light emission surface, 16b ... Light incident surface, 17 ... LED (light source), 18 ... LED substrate (light source substrate), 19 ... reflective sheet, 20 ... heat dissipation member, TV ... TV receiver, LU ... LED unit (light source unit), LDU ... liquid crystal display unit

Claims

A plate-shaped member, which is composed of at least one end surface of the plate-shaped member and is configured to emit light incident from the light incident surface which is composed of a light incident surface on which light is incident and a front surface of the plate-shaped member. A light guide plate having a light exit surface,
A light source that emits light toward the light incident surface;
The light source is mounted on a front plate surface, and the light source substrate is arranged so as to face the light incident surface with a predetermined distance therebetween, and
A sheet-like optical member disposed so as to overlap the light guide plate in a state where a peripheral portion protrudes outside the light incident surface;
A light-shielding layer provided on the peripheral portion of the optical member;
A liquid crystal panel disposed so as to overlap the optical member in a state where the end portion enters the inner side of the peripheral portion of the optical member;
A display device, comprising: a frame body that extends to a peripheral portion of the front surface of the liquid crystal panel and sandwiches the liquid crystal panel with the light guide plate.
The optical member comprises a laminate of a plurality of optical sheets,
The display device according to claim 1, wherein the light shielding layer is provided only on a part of the plurality of optical sheets forming the laminate.
The display device according to claim 2, wherein the light shielding layer is provided on the optical sheet that is disposed closest to the liquid crystal panel among the plurality of optical sheets forming the laminate.
The display device according to any one of claims 1 to 3, wherein the light shielding layer is formed on a back surface of the peripheral portion of the optical member facing the light emitting surface side.
The display device according to claim 4, wherein the light shielding layer is further provided on an end surface of the peripheral portion of the optical member.
The display device according to any one of claims 1 to 5, wherein the light shielding layer is provided only in the vicinity of the light source so as to correspond to an installation location of the light source.
The display device according to any one of claims 1 to 6, wherein the light shielding layer is made of a light shielding tape.
The display device according to any one of claims 1 to 7, wherein the light source includes a light emitting diode.
The display device according to any one of claims 1 to 8, further comprising a chassis disposed on a plate surface side on the back side of the light guide plate.
The display device according to claim 9, wherein the frame sandwiches the light guide plate, the optical member, and the liquid crystal panel between the chassis and the chassis.
A television receiver comprising the display device according to any one of claims 1 to 10.