WO2015060272A1 - Liquid crystal display device - Google Patents

Abstract

Provided is a technology of improving optical characteristics of a backlight in a liquid crystal display device, said backlight having a light source linearly disposed therein, and reflecting, by means of a reflection sheet having a curved shape, light emitted from the light source. A liquid crystal television set (1) has: a liquid crystal panel (12); a reflection sheet (30), which is disposed on the rear surface side of the liquid crystal panel (12), and which has a shape that is curved such that a surface facing the liquid crystal panel (12) is concave; and an LED light source module (40) (LED substrate (42)) having a plurality of LED chips disposed thereon by aligning the LED chips with each other in the horizontal direction. The curved shape of the reflection sheet (30) is an arc that is continuous in the vertical direction. Furthermore, the LED chips are disposed at arc shape areas furthest from the front side.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a backlight structure in which a light source is linearly arranged and light from the light source is reflected by a curved reflection sheet.

In a liquid crystal display device typified by a liquid crystal television, a backlight (also referred to as a “backlight unit”) is an essential configuration, and various types of backlights are employed. As one form of such a backlight, there is a structure called a one-lamp type backlight. Specifically, such a liquid crystal display device has a backlight structure in which only one LED substrate on which a plurality of LEDs (light emitting diodes) serving as light sources are arranged in the horizontal direction is arranged at the upper and lower central positions on the back of the display panel. (For example, refer to Patent Document 1).

In the technique disclosed in Patent Document 1, light from a light emitting diode is reflected using a reflective sheet having a curved cross-sectional shape, and the light is transmitted through a predetermined optical sheet to irradiate the back surface of the liquid crystal panel evenly. To do.

JP 2012-230264 A

By the way, in the technique disclosed in Patent Document 1, in the reflective sheet, the portion where the LED is arranged is flat to fix the LED substrate. As a result, the presence of this flat portion makes it difficult to make adjustments for transmitting light through the optical sheet and making the light uniform, and a measure for the narrow design freedom is required.

The present invention has been made in view of the above situation, and an object thereof is to provide a technique for solving the above problems.

The present invention relates to a liquid crystal panel, a reflective sheet that is arranged on the back side of the liquid crystal panel and is curved so that a surface facing the liquid crystal panel is concave, and a back in which a plurality of light sources are arranged in a horizontal direction. A liquid crystal display device having a light unit,
The curved shape of the reflection sheet is formed in an arc shape that is continuous in the vertical direction, and the light source is disposed at the deepest portion of the arc shape.
Moreover, the light source board | substrate with which the said light source is attached may be arrange | positioned in the back side from the said reflection sheet, and the said light source may protrude ahead from a reflection sheet.
Further, an end portion of the reflection sheet extends to an end portion of the liquid crystal panel, bends immediately before the endmost portion, is attached to a receiving rib provided on an outer peripheral edge of the rear cabinet, and is located on an outer portion from the bent position. The optical sheet and the liquid crystal panel may be overlapped and arranged.
Moreover, you may provide the back cabinet which covers the back side of the said backlight unit, the cover-like cover which covers the said back cabinet, and the circuit board arrange | positioned between the said back cabinet and the said cover.

According to the present invention, in a liquid crystal display device having a backlight structure in which a light source is arranged in a straight line and the light from the light source is reflected by a curved reflecting sheet, a technique for improving the light characteristics of the backlight is provided. it can.

It is a perspective view of the liquid crystal television based on 1st Embodiment. It is a disassembled perspective view of the liquid crystal television based on 1st Embodiment. It is the perspective view which showed the back surface cabinet part of the state to which the backlight unit based on 1st Embodiment was attached. It is a figure shown with the perspective view which showed the back cabinet part of the state to which the heat sink was attached based on 1st Embodiment. It is the perspective view which showed the back cabinet part based on 1st Embodiment. It is a back surface perspective view of the back cabinet part based on 1st Embodiment. It is the figure which expanded and showed area | region A1 of FIG. 3 based on 1st Embodiment. It is a perspective view of a heat sink concerning a 1st embodiment. It is an expanded view of the reflective sheet based on 1st Embodiment. It is the figure which expanded and partially showed the perspective view of the reflective sheet based on 1st Embodiment. It is sectional drawing which showed the attachment structure of the peripheral part of the reflective sheet based on 1st Embodiment. It is a figure explaining the reflective sheet based on 2nd Embodiment. It is a figure explaining the reflective sheet of the state attached to the back cabinet part based on 2nd Embodiment. It is a figure which shows the attachment structure to the heat sink mounting part of the heat sink based on 3rd Embodiment. It is a figure which shows the attachment structure to the heat sink mounting part of the heat sink based on 3rd Embodiment. It is a figure which shows the attachment structure to the heat sink mounting part of the heat sink based on 3rd Embodiment.

Next, modes for carrying out the present invention (hereinafter simply referred to as “embodiments”) will be specifically described with reference to the drawings. In the following embodiments, a liquid crystal television will be described as an example of a liquid crystal display device, but other configurations can be applied to a computer with a liquid crystal display, a liquid crystal monitor device, and the like.

<First Embodiment>
FIG. 1 is a perspective view of a liquid crystal television 1 according to this embodiment. FIG. 2 is an exploded perspective view of the liquid crystal television 1.

As shown in the figure, the liquid crystal television 1 is supported by a stand 21 via a predetermined fixing angle, and a frame-shaped front cabinet 11 covers the outer peripheral portion of the front surface of the liquid crystal panel 12.

On the back side of the liquid crystal panel 12, an optical sheet 15, a reflection sheet 30, and a back cabinet section 50 are arranged. The circuit board 18 is attached to the back side of the back cabinet unit 50. Furthermore, a back lower cover 19 and a back upper cover 20 are attached to the back of the back cabinet 50 so as to cover them. Further, the LED light source module 40 is disposed between the reflection sheet 30 and the back cabinet section 50. The LED light source module 40 is referred to as a so-called backlight unit (also referred to as “backlight module”). In recent years, LEDs have been widely used as light sources for backlight units. The optical sheet 15 is composed of a white diffusion sheet or the like, and diffuses incident light.

FIG. 3 is a perspective view showing the back cabinet section 50 with the LED light source module 40 attached. FIG. 4 is a perspective view showing the rear cabinet portion 50 with the heat sink 41 attached, and shows a state in which the LED substrate 42 of FIG. 3 is removed. FIG. 5 is a perspective view showing the rear cabinet section 50 and shows a state in which the heat radiating plate 41 of FIG. 4 is removed. FIG. 6 is a perspective view showing the back surface of the back cabinet section 50. Further, FIG. 7 is an enlarged view of the area A1 of FIG.

The LED light source module 40 has a configuration in which an LED substrate 42 is mounted on a horizontally long box-shaped heat radiating plate 41 (also referred to as “heat spreader” or “heat sink”). The LED substrate 42 and the heat radiating plate 41 may be fixed with an adhesive or a screw. Here, seven button-shaped (hemispherical) LED chips 48 are arranged on the LED substrate 42 at predetermined intervals. The LED chip 48 has a structure in which LED elements are sealed with a lens-shaped LED cover.

8A and 8B are perspective views of the heat radiating plate 41. FIG. The heat sink 41 is a metal plate to which the LED substrate 42 is attached. The heat sink 41 itself is disposed on the heat sink mounting portion 53 and is fixed at the notch portion 47 for locking by the guide rail / fixing claw 54. The material of the heat radiating plate 41 is preferably a material having high thermal conductivity, such as an aluminum plate. The heat radiating plate 41 is pressed into a box shape, and a heat radiating plate base portion 43 in which a region to which the LED substrate 42 is attached is bulged in a convex shape, and a fixing formed in a frame shape at the outer peripheral portion thereof. And an outer peripheral frame 44. The heat sink base portion 43 is formed with a substrate fixing hole 45 used for fixing the LED substrate 42 attached to the upper surface (convex surface) as necessary. When an adhesive is used for fixing, the substrate fixing hole 45 is not necessary. The fixing outer peripheral frame 44 is formed on three sides of the outer periphery on the left and right sides and the lower side.

Two locking cutout portions 47 are formed at predetermined positions on two sides of the upper and lower outer peripheries. A harness through hole 46 is formed at the lower right end of the fixing outer peripheral frame 44. The harness through hole 46 allows the harness to communicate when the heat sink 41 is attached to the heat sink attachment portion 53.

The rear cabinet unit 50 is configured to fit the shape of the reflective sheet 30 and to be able to attach the LED light source module 40 so as to accommodate the curved reflective sheet 30.

Specifically, the back cabinet part 50 is formed in a concave shape with a predetermined depth so as to accommodate the reflection sheet 30. A frame-like rear cabinet outer peripheral frame 58 is formed at the front end of the rear cabinet section 50, and outer edge portions such as the liquid crystal panel 12, the optical sheet 15, and the reflection sheet 30 are attached. This mounting structure will be described later with reference to FIG.

The inner part of the rear cabinet outer peripheral frame 58 is formed in a concave shape that is curved up and down in a circular arc shape, and the reflection sheet 30 is accommodated in this part. A heat sink mounting portion 53 for mounting the horizontally long LED light source module 40 is formed in a square frame shape at the center position of the concave shape. The heat radiating plate 41 has a structure that is directly fixed to the back cabinet section 50, and has a structure that also serves as a backlight chassis.

A large number of exhaust holes 52 are formed in the inner portion of the heat sink mounting portion 53. The outer edge portions of the heat sink 41 (left and right and the outer peripheral frame 44 for fixing and the upper side) are arranged on the heat sink mounting portion 53. In the rear view of the rear cabinet section 50 in FIG. 6, an exhaust hole 52 is formed in the center 60 on the outer surface of the rear cabinet base section. That is, since the exhaust hole 52 is provided directly under the heat radiating plate 41, the heat of the LED substrate 42 can be effectively discharged. The circuit board 18 is attached to the lower part 61 of the rear cabinet base outer surface below the rear cabinet base outer surface center 60.

Here, as shown in FIG. 5, a part of the frame-shaped heat sink mounting portion 53 (the lower left portion of the heat sink mounting portion 53 in the drawing) is provided inside the rear cabinet portion 50 (back cabinet base portion inner surface 51). A wiring communication hole 65 is formed to communicate with the outside (the rear cabinet base portion outer surface lower portion 61). Furthermore, two ribs 66 extending upward from both sides of the routing communication hole 65 are formed. Since the back lower cover 19 is attached to the rear cabinet base outer surface lower portion 61, light leakage from the routing communication hole 65 is prevented. Further, since the routing rib 66 is configured to abut on the concave inner surface of the heat radiating plate 41 to separate the space, light leakage from the exhaust hole 52 to the outside is prevented.

Also, two guide rail / fixing claws 54 are formed on each of the upper and lower sides of the heat sink mounting portion 53 (four in total). A structure is adopted in which the heat radiation plate 41 with the LED substrate 42 attached is inserted and fixed with reference to guide rails and fixing claws 54 provided on the upper and lower sides. When the heat radiating plate 41 is attached to the heat radiating plate mounting portion 53, the guide rail / fixing claw 54 is fitted into the locking notch portion 47 from above, and then the heat radiating plate 41 is slightly slid to be fixed. . With this structure, the process of aligning the screw stopper can be omitted. Moreover, since the LED board 42 is fixed to the heat sink 41, the position of the LED board 42 (LED chip 48) is also determined first.

Therefore, the positioning process of the LED light source module 40 can be simplified, and it is not necessary to provide ribs or bosses for attaching the heat sink 41 and the LED substrate 42 on the cabinet side. Further, the exhaust hole 52 is completely covered with the heat radiating plate 41 so that the LED board 42 does not leak light.

On the inner surface 51 of the rear cabinet base portion, an arcuate upper rib 55 extending upward from the heat sink mounting portion 53 to the vicinity of the rear cabinet outer peripheral frame 58 and similarly extending downward to the vicinity of the rear cabinet outer peripheral frame 58. Outward arc-shaped lower ribs 56 are formed at six locations at predetermined intervals, respectively. The arcuate upper rib 55 and the arcuate lower rib 56 thus formed in a rib shape are in contact with and supported by the back surface side of the reflection sheet 30 that has an arcuate concave shape. That is, inside the structure of the liquid crystal television 1 to which the curved reflection sheet 30 is attached, the curved shape of the reflection sheet 30 is supported and supported by the arc-shaped upper rib 55 and the arc-shaped lower rib 56 of the inner surface 51 of the rear cabinet base. Can be prevented from being distorted.

A plurality of support bosses 57 (supports) are formed on the inner surface 51 of the back cabinet base. Here, it is formed at a substantially intermediate position between the heat sink mounting portion 53 and the rib fixing opening 38. The reflective sheet 30 can be sufficiently supported only by the arc-shaped upper rib 55 and the arc-shaped lower rib 56, but when it is desirable to fix the reflective sheet 30 at an intermediate position due to factors such as the material of the reflective sheet 30 being thin, Supporting bosses 57 may be used.

It should be noted that the region where the arc-shaped lower rib 56 is formed (region surface where the root portion of the arc-shaped lower rib 56 is formed) is a curved forming portion 51b. That is, the curve forming part 51 b is formed in a curve corresponding to the shape of the reflection sheet 30 accommodated in the back cabinet part 50. Therefore, a space for arranging the circuit board 18 such as the main board or the power supply board can be secured on the back side of the region (the lower part 61 on the outer surface of the back cabinet base in FIG. 6). As a result, the thickness of the liquid crystal television 1 itself can be reduced.

FIG. 9 is a development view of the reflection sheet 30. FIG. 10 is a partially enlarged perspective view of the reflection sheet 30 and mainly shows a fixing structure to the LED light source module 40 and the back cabinet 50. The reflective sheet 30 is formed by processing a single white sheet into a shape as shown in the development view of FIG. 9 and assembling the shape of the development view, thereby creating a three-dimensional reflection sheet 30 as shown in FIGS. Become. Note that the reflection sheet 30 has a characteristic of substantially totally reflecting light.

The reflection sheet 30 includes a reflection sheet arc surface 31 and a reflection sheet side surface 32 as a light reflection structure of the LED light source module 40. The upper and lower edges 35 of the reflection sheet arc surface 31 are bent and disposed on the rear cabinet outer peripheral frame 58 of the rear cabinet 50. Similarly, the left and right edge portions 37 of the reflection sheet side surface 32 are bent and disposed on the rear cabinet outer peripheral frame 58 of the rear cabinet portion 50. A plurality of rib fixing openings 36 and 38 are formed in the edge portions 35 and 37 and attached to the reflection sheet receiving rib 59.

The reflective sheet arc surface 31 is a horizontally long and substantially rectangular shape. The left and right short sides 31a are recessed in an arc shape toward the inside. The reflection sheet side surface 32 is continuously formed in the upper and lower central portions of the short side 31a.

Seven LED insertion openings 33 are formed in a row at the center of the reflection sheet arc surface 31 in the vertical direction. The LED insertion opening 33 is an opening having substantially the same circle as the outer diameter of the LED chip 48 of the LED light source module 40. The LED chip 48 protrudes from the LED insertion opening 33.

The reflection sheet side surface 32 has a partially semicircular shape with an arcuate outer shape, and the edge portion 37 having the predetermined width described above is formed on the outer portion corresponding to the string. The upper and lower central portions of the arc 32 a on the reflecting sheet arc surface 31 side are formed continuously with the reflecting sheet arc surface 31.

In the unfolded state, the short side 31a and the arc 32a are formed apart from each other as shown in the figure. When assembling the reflection sheet 30 into a three-dimensional structure, the opposing short side 31a and the arc 32a are made to coincide with each other from the back side. By fixing with a fixing means such as a tape, the reflection sheet arcuate surface 31 is curved and completed. The reflection sheet 30 of the present embodiment has an arc shape that is continuously formed around the arrangement portion of the LED chips 48, and is not a configuration in which the central portion is a plane and the upper and lower portions are curved portions. As a result, the reflection characteristics of the reflection sheet 30 can be improved, and the light uniformity in the liquid crystal panel 12 can be reduced.

The reflective sheet 30 molded into a three-dimensional shape is attached to the rear cabinet unit 50. At this time, as described above, the rib fixing opening 36 and the rib fixing opening 38 are attached to the reflection sheet receiving rib 59 formed in the rear cabinet outer peripheral frame 58 of the rear cabinet section 50 at the peripheral portion of the reflective sheet 30. It is done.

Further, in the LED insertion opening 33 formed in the arcuate deepest portion (the rearmost end portion) of the reflecting sheet arc surface 31, the LED chip 48 protrudes from the back side to the front side. The outer shape of the LED chip 48 (the outer shape of the LED cover portion) is substantially the same shape as the LED insertion opening 33. In addition, peripheral projections 49 (triangular projections 49a and rectangular projections 49b) are formed on the outer shape portion (LED cover portion) of the LED chip 48 so as to protrude slightly outward in a plurality of claws. When the LED chip 48 protrudes to the front surface side of the reflection sheet arc surface 31, the peripheral protrusion 49 is also positioned on the entire surface side of the reflection sheet arc surface 31, and the peripheral protrusion 49 causes the reflection sheet arc surface 31 to LED. It functions to hold onto the substrate 42. That is, the peripheral protrusion 49 positions the deepest portion of the reflective sheet arc surface 31. Therefore, the screw etc. which fix the reflective sheet 30 to the LED board 42 become unnecessary. Further, even when a screw or the like is used, for example, it can be sufficiently fixed with only one screw. In addition, about the said structure, the technique described in the patent 4613254 is used.

FIG. 9 illustrates a structure in which the boss fixing opening 34 is formed in the reflecting sheet arc surface 31. The boss fixing opening 34 is used when it is necessary to fix the reflection sheet 30 to the support boss 57. When such fixing is not necessary, the boss fixing opening 34 is naturally used. Be omitted.

FIG. 11 is a cross-sectional view showing the mounting structure of the peripheral portion of the reflection sheet 30, and particularly illustrates the mounting structure portion of the edge portion 35 and the rib fixing opening 36 of the reflection sheet 30.

As shown in the drawing, the edge 35 of the reflection sheet 30 is arranged on the rear cabinet outer peripheral frame 58 so that the rear cabinet outer peripheral frame 58 is hooked on the reflection sheet receiving rib 59. The optical sheet 15 is placed on the reflective sheet 30 (edge 35). Further, the liquid crystal panel 12 is disposed on the optical sheet 15 in an overlapping manner. A front cabinet 11 is attached on the liquid crystal panel 12. A buffer / seal member 13 is disposed between the liquid crystal panel 12 and the front cabinet 11 as necessary.

Incidentally, the outer peripheral edge portion (region B1 in the figure) of the liquid crystal panel 12 is generally a glass exposed region (glass end surface). Conventionally, in order to prevent light leakage from the exposed glass region, a predetermined frame-shaped chassis (a member corresponding to the intermediate frame of Patent Document 1) has been attached. The chassis (intermediate frame) has a function of shielding light in front of the glass end surface so that light does not leak through the optical sheet 15 or the like to the glass end surface (transparent) of the liquid crystal panel 12. However, in this embodiment, a structure in which the reflection sheet 30 is disposed between the glass end surface and the LED chip 48 is employed. That is, the reflection sheet 30 is present on the front surface (the liquid crystal panel 12 side) of the LED chip 48 that is a light source. Further, the arc shape of the reflection sheet 30 and the formation position of the edge 35 are also set so that the light of the LED chip 48 does not enter the glass end surface, and the reflection sheet 30 has a function of shielding the glass end surface. Therefore, a predetermined chassis for light leakage countermeasure can be eliminated.

As described above, in the present embodiment, the shape of the reflection sheet 30 is configured as described above, so that luminance distribution and uneven distribution of the entire screen can be suppressed and uniformity (luminance uniformity) can be improved. That is, when the LED light source module 40 is only one horizontal row of LED chips 48, the entire screen, which has been a problem in the past, particularly the luminance dispersion in the vertical direction varies greatly, and the central portion becomes brighter and darker as it goes up and down. If there are many cases, the point is solved.

In other words, it is possible to suppress luminance variation when one LED substrate 42 on which a small number of LED chips 48 are mounted is attached to the back cabinet section 50, and the average degree can be improved. In addition, since a good luminance distribution can be realized even at a low cost, the liquid crystal television 1 having a good display quality can be realized even in a so-called low-end product or a product adopting a simple structure.

Also, curved molding (molding of the rear cabinet base outer surface lower portion 61) is performed in accordance with the shape of the reflection sheet 30. As a result, an unnecessary space is not taken between the optical sheet 15 and the back cabinet section 50, and the circuit board 18 is efficiently provided in the space without providing a separate area for arranging the circuit board 18 and the like. The LCD TV 1 can be designed to be thin.

Further, although the reflection sheet 30 is a thin and delicate member, by arranging the arcuate upper rib 55 and the arcuate lower rib 56 in a rib shape, the reflection sheet 30 can be received and supported effectively, and vibration can be achieved. It is possible to suppress wrinkling of the reflection sheet 30 due to an external impact caused by dropping or the like.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to combinations of the respective components and the like, and such modifications are within the scope of the present invention. For example, in the above-described configuration, the LED light source module 40 (LED chip 48) is fixed to the rear cabinet unit 50 at a position that is the upper and lower center of the liquid crystal panel 12. However, the present invention is not limited to this configuration, and the liquid crystal panel 12 may be arranged at a substantially central position in the vertical direction. Here, “substantially center” refers to a range having little difference from the optical characteristics when the LED chip 48 as a light source is disposed in the center. Specifically, the luminance distribution on the liquid crystal panel 12 when the light source (LED chip 48) is arranged at the center and the luminance distribution on the liquid crystal panel 12 when the light source (LED chip 48) is shifted from the center are below a predetermined specification. Is the position. As the predetermined specification, for example, the difference in luminance distribution on the liquid crystal panel 12 is 10% or less. In addition, when the LED chip 48 is set at a position shifted from the center, the position and the like of other corresponding configurations are also shifted as necessary.

<Second Embodiment>
FIG. 12 is a diagram illustrating the reflection sheet 130 according to the present embodiment. Fig.12 (a) is the figure which showed typically the expanded view of the reflective sheet 130 of this embodiment. FIG. 12B is a diagram schematically showing a development view of the reflection sheet 30 of the first embodiment shown for comparison. Moreover, FIG. 13 is a figure explaining the reflective sheet 130 of the state attached to the back surface cabinet part 50 based on this embodiment. FIG. 13A schematically shows a cross-section in the lateral direction (corresponding to the C1-C1 region in FIG. 12A) of the reflective sheet 130 of the present embodiment attached to the rear cabinet unit 50. FIG. FIG. 13B is a schematic cross-sectional view (corresponding to the region C2-C2 in FIG. 12B) of the reflection sheet 30 of the first embodiment shown for comparison, attached to the rear cabinet unit 50. It shows.

Compared with the reflective sheet 30 of the first embodiment, in the reflective sheet 130 of the present embodiment, the left and right reflective sheet side surfaces 132 are expanded. As a result, as shown in FIG. In the state attached to 50, it is formed in the concave circular arc surface. On the other hand, the reflection sheet side surface 32 of the above-described reflection sheet 30 is formed in a plane. An LED insertion opening 133 is formed at the center of the reflection sheet arc surface 131 in the same manner as in the first embodiment, and the LED chip 148 is disposed.

Since the reflection sheet side surface 132 is attached to the back cabinet 50 as an arc surface in this way, the light reflected by the reflection sheet side surface 132 can be emitted more uniformly. As a result, even when the number of LED chips 148 arranged in a row is reduced, it is easy to make the light uniform. That is, the number of LED chips 148 can be reduced, the LED light source module 140 can be reduced in size, and the arrangement space of the LED light source module 140 can be reduced.

<Third Embodiment>
FIG. 14 to FIG. 16 show the mounting structure of the heat sink 141 according to this embodiment to the heat sink mounting portion 153. FIG. 14 is a perspective view showing a state before the heat sink 141 is attached to the heat sink attachment portion 153. FIG. 15 is a perspective view illustrating a state in the middle of attaching the heat sink 141 to the heat sink attachment portion 153. FIG. 16 is a perspective view showing a state in which the heat radiating plate 141 is attached to the heat radiating plate attaching portion 153.

The heat sink 141 includes a plurality of alignment recesses 147 in the outer edge region of the fixing outer peripheral frame 144. The region where the alignment recess 147 is formed corresponds to the region where the locking notch 47 is formed in the above embodiment. Unlike the first embodiment, the outer edge region of the heat radiating plate base portion 143 on the opposite side of the fixing outer peripheral frame 144 is not formed with a locking structure or the like. It has become.

The heat sink mounting portion 153 includes a plurality of alignment claws 154a and a plurality of fixing claws 154b. The alignment claw 154a has a locking shape (claw shape) on the inner side (the fixing claw 154b side or the exhaust hole installation surface 152 side), and is formed so that the alignment recess 147 of the heat radiating plate 141 just fits. ing. The fixing claw 154b has a locking shape (claw shape) on the inner side (positioning claw 154a side or exhaust hole installation surface 152 side) so as to hold the outer edge of the heat radiating plate base portion 143 of the heat radiating plate 141. Is formed.

When attaching the heat radiating plate 141 to the heat radiating plate attaching portion 153, first, as shown in FIG. 15, the operator fits the alignment concave portion 147 of the fixing outer peripheral frame 144 into the alignment claw 154a. Subsequently, the operator pushes the heat sink base portion 143 on the opposite side of the fixing outer peripheral frame 144 so as to contact the heat sink attachment portion 153. As a result, as shown in FIG. 16, the outer edge portion of the heat radiating plate base portion 143 is pressed and fixed by the fixing claw 154b.

The mounting structure of the heat radiating plate 141 to the heat radiating plate mounting portion 153 facilitates the mounting operation of the heat radiating plate 141 as compared with the slide insertion structure of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Liquid crystal television 11 Front cabinet 12 Liquid crystal panel 15 Optical sheet 18 Circuit board 19 Back lower cover 20 Back upper cover 21 Stand 30, 130 Reflective sheet 31, 131 Reflective sheet arc surface 31a Short side 32a Arc 32, 132 Reflective sheet side surface 33, 133 LED insertion opening 34 Boss fixing opening 35 Edge 36 Rib fixing opening 37 Edge 38 Rib fixing opening 40, 140 LED light source module (backlight unit)
41, 141 Radiation plate 42, 142 LED board 43, 143 Radiation plate base 44, 144 Fixing outer peripheral frame 45 Substrate fixing hole 46 Harness through hole 47 Locking notch 48, 148 LED chip 49 Peripheral protrusion 49a Triangle Protrusion 49b Rectangular protrusion 50 Rear cabinet part 51 Rear cabinet base part inner surface 51b Curved molding part 52 Exhaust holes 53, 153 Radiation plate attachment part 54 Guide rail / fixing claw 55 Arc-shaped upper rib 56 Arc-shaped lower rib 57 Boss 58 Rear cabinet outer frame 59 Reflective sheet receiving rib 60 Rear cabinet base outer surface center 61 Rear cabinet base outer lower part 65 Routing communication hole 66 Routing rib 147 Alignment recess 152 Exhaust hole installation surface 154a Alignment claw 154b For fixing Claw

Claims (4)

A liquid crystal panel, a reflective sheet having a curved shape disposed on the back side of the liquid crystal panel and facing the liquid crystal panel, and a backlight unit in which a plurality of light sources are arranged in a horizontal direction; A liquid crystal display device comprising:
The curved shape of the reflection sheet is formed in an arc shape that is continuous in the vertical direction, and the light source is disposed in the deepest portion of the arc shape. The light source substrate to which the light source is attached is disposed on the back side of the reflective sheet,
The liquid crystal display device according to claim 1, wherein the light source protrudes forward from the reflection sheet. The end of the reflection sheet extends to the end of the liquid crystal panel, bends immediately before the end, and is attached to a receiving rib provided on the outer peripheral edge of the back cabinet,
3. The liquid crystal display device according to claim 1, wherein the optical sheet and the liquid crystal panel are disposed so as to overlap each other at a portion outside the bent position. A back cabinet covering the back side of the backlight unit;
A lid-like cover covering the back cabinet;
A circuit board disposed between the back cabinet and the cover;
The liquid crystal display device according to claim 1, further comprising:

Images