JP4456028B2 - Display device - Google Patents

Description

  The present invention relates to a display device that displays an image or the like.

  In a non-self-luminous display device such as a liquid crystal display device, a surface illumination device called a backlight unit is disposed behind a display element such as a liquid crystal display panel. The backlight unit is divided into a direct type and a side light type (edge light type). Among these, the side light type backlight unit includes a light emitting part (light source), a light guide plate, a reflection sheet, a diffusion sheet, and the like. A back plate is disposed behind the backlight unit. On the rear side of the back plate, heat radiating fins for releasing heat generated in the backlight unit to the outside of the display device are mounted on the back plate by screws.

  If the screws for screwing come into contact with the optical components of the backlight unit such as a reflective sheet, the contact area becomes shadowed or uneven when viewed from the light emitting surface of the backlight unit, and the quality of the backlight unit is degraded. End up. The back plate is raised in the opposite direction of the surface facing the backlight unit, that is, the direction facing the heat radiating fins by drawing or the like so that the screw does not contact the reflection sheet.

  FIG. 5 is a perspective view showing a configuration of a back plate of a conventional display device. The planar back plate 107 has a drawing portion 112 formed by raising a part of the back plate 107 by drawing. A plurality of screw holes 117 are formed in the drawing portion 112.

  FIG. 6 is a cross-sectional view showing a configuration of a joint portion between a back plate and a heat radiating fin of a conventional display device. In the display device, the reflection sheet 9 and the back plate 107 are arranged in close contact with each other. A mounting hole 115 for mounting the radiation fin 110 to the back plate 107 is formed in the radiation fin 110. The screw 111 is screwed into the screw hole 117 formed in the drawing portion 112 of the back plate 107 through the mounting hole 115, and the radiating fin 110 is mounted on the back plate 107. A part of the back plate 107 is raised in a direction facing the heat dissipating fin 110 by drawing or the like, thereby preventing the screw 111 from contacting the reflection sheet 9.

JP 2000-148028 A

  However, when the back plate 107 is subjected to a drawing process, the back plate 107 is distorted. This distortion affects the assembly of optical components inside the backlight unit, and the backlight unit is also deformed. Therefore, in the display device in which the back plate 107 is subjected to drawing processing, there is a problem that the luminance and the uniformity of the luminance of the backlight unit are lowered, and good display quality cannot be obtained.

  In addition, since the back plate 107 is subjected to a drawing process and a part thereof is raised in a direction facing the heat radiating fins 110, the contact area between the heat radiating fins 110 and the back plate 107 is reduced, and the heat radiating effect of the heat radiating fins 110 is reduced. There is.

  An object of the present invention is to provide a display device capable of obtaining good display quality.

The object is to display an image or the like, a surface illumination device that is arranged behind the display device and emits light to the display device, a back plate arranged behind the surface illumination device, Formed on the radiating fin, a convex screw part formed in a convex shape from the surface of the back plate facing the surface illuminating device toward the back surface side, a heat radiating fin for releasing the heat generated in the surface illuminating device to the outside, and is a encompass space the convex thread portion, wherein through the mounting hole portion having a through portion communicating with the space portion at the space portion of the same or narrower than the inner diameter, the front SL through portion projecting This is achieved by a display device characterized by having a fixing screw portion that is screwed with a threaded screw portion and fixes the radiating fin to the back plate.

  According to the present invention, it is possible to realize a display device with good display quality.

  A display device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a configuration of a display device according to the present embodiment. The display device 20 has a display element (for example, a liquid crystal display panel) 1 on the front surface. A first optical sheet 3 is disposed behind the display element 1. Behind the first optical sheet 3, a backlight unit that is a surface illumination device having the second optical sheet 4, the light guide plate 5, the reflection sheet 9, and the light emitting unit 8 is disposed. The light guide plate 5 has, for example, a rectangular planar shape, and has a light emission surface 5a on the display element 1 side. In the vicinity of two opposing edges of the light guide plate 5, for example, a light emitting unit 8 in which a plurality of LEDs having different emission colors are arranged is arranged. A gas space 19 having a predetermined thickness is provided between the light exit surface 5 a and the diffusion sheet 4. Scattering dots or the like (not shown) are provided on the back surface side of the light exit surface 5 a of the light guide plate 5. In addition, a reflective sheet 9 is disposed to face the surface of the light guide plate 5 on which scattering dots and the like are provided.

  The light emitted from the light emitting unit 8 enters the light guide plate 5 and is guided through the light guide plate 5, and is emitted mainly from the light exit surface 5 a of the light guide plate 5 by the scattering dots and the reflection sheet 9. The light emitted from the light emission surface 5 a passes through the gas space 19 and the first and second optical sheets 3 and 4 and enters the display element 1. The side surfaces of the display element 1 and the backlight unit are covered with, for example, a resin frame 6. Further, the entire side surface and the peripheral portion of the front surface are covered with the display device cover 2. The back surface is covered with a metal back plate 7. A radiating fin 10 is fixed to the back plate 7 by screwing behind the back plate 7.

  FIG. 2 is a perspective view showing the configuration of the back plate 7 of the display device 20 according to the present embodiment. Convex thread portions 17 are formed at a plurality of predetermined positions on the planar back plate 7. The convex threaded portion 17 is formed in a flange shape that is convex from the surface of the back plate 7 facing the backlight unit toward the back surface thereof by burring. The inner peripheral portion of the convex screw portion 17 is threaded to cut a female screw 17a (not shown in FIG. 2, see FIG. 3).

  FIG. 3 shows a partial cross section cut along the line AA in FIG. 2 in a state in which the radiating fins 10 are mounted on the back plate 7. As shown in FIG. 3, the heat radiating fin 10 brings the contact plane 10a into close contact with the back surface of the back plate 7, and efficiently generates heat generated in the backlight unit (only the reflection sheet 9 is shown in FIG. 3). It is fixed to the back plate 7 so as to escape into the air.

  At a predetermined position of the radiating fin 10, a mounting hole portion 15 including a space portion 15 a including the convex screw portion 17 and a through portion 15 b communicating with the space portion 15 a is formed. The inner wall of the space 15 a of the mounting hole 15 is formed so as to substantially follow the outer wall contour of the convex screw portion 17. In the example shown in FIG. 3, the space 15a and the through-hole 15b of the mounting hole 15 have a hollow cylindrical shape with the same inner diameter. As a matter of course, the inner diameter of the space portion 15 a is wider than the outer diameter of the convex screw portion 17, and the depth of the space portion 15 a is deeper than the height of the convex screw portion 17.

  The male screw 11a of the fixing screw portion 11 and the female screw 17a of the convex screw portion 17 are screwed through the through-hole 15b of the mounting hole 15 of the radiating fin 10, and the fixing screw portion 11 and the convex screw portion 17 Is tightened. Thereby, the screw head 11b of the fixing screw portion 11 and the attached washer 11c abut against the outer peripheral surface of the mounting hole 15 of the radiating fin 10 to press the radiating fin 10 toward the back plate 7, and the radiating fin 10 It is fixed to the back plate 7. As a matter of course, the outer diameters of the screw head 11b and the attached washer 11c are formed wider than the inner diameter of the space 15a. Further, the distance between the washer 11 c attached to the fixing screw portion 11 and the screw tip surface 11 d is shorter than the sum of the plate thickness of the radiating fin 10 and the plate thickness of the back plate 7. Thereby, even if the radiation fin 10 is fixed to the back plate 7 with the fixing screw portion 11, the screw tip surface 11d does not come into contact with the reflection sheet 9 which is the lowermost layer of the backlight unit.

  Thus, according to the mounting structure of the radiating fins 10 according to the present embodiment, the radiating fins 10 can be fixed to the back plate 7 without drawing the back plate 7. Distortion can be prevented. Accordingly, the deformation of the backlight unit can be suppressed, and the luminance of the backlight unit and the uniformity of the luminance can be prevented from being lowered.

  Further, since the screw tip surface 11d does not contact the reflective sheet 9, it is possible to prevent shadows and uneven brightness due to contact between the screw tip surface 11d and the reflective sheet 9 when viewed from the light emitting surface of the backlight unit.

  Furthermore, since the convex screw portion 17 is convex in the direction facing the heat radiating fin 10, the convex screw portion 17 can also serve as a positioning pin when the heat radiating fin 10 is mounted on the back plate 7. 10 can be easily mounted on the back plate 7.

  Moreover, since drawing process becomes unnecessary and the surface of the back plate 7 becomes flat, the contact area between the heat radiation fin 10 and the back plate 7 can be increased, and the heat radiation effect of the heat radiation fin 10 can be improved. As a result, a display device with good display quality can be realized.

  Next, a modification of the present embodiment will be described with reference to FIG. FIG. 4 shows a partial cross section cut along the line AA in FIG. 2 in a state in which the radiating fins 10 are mounted on the back plate 7. In principle, the configuration of the present modification exhibits the same function and function as the configuration shown in FIG. In the mounting structure shown in FIG. 4, the inner diameter of the space portion 15 a of the mounting hole 15 is wider than the outer diameter of the convex screw portion 17, and the depth of the space portion 15 a is deeper than the height of the convex screw portion 17. However, the inner diameter of the penetrating portion 15b is the same as or smaller than the outer diameter of the convex screw portion 17, and is wider than the outer diameter of the body portion where the male screw 17a of the fixing screw portion 11 is formed.

  As described above, the heat dissipating fin 10 of this modification has not only the mounting hole portion 15 formed so as to escape the convex screw portion 17 of the back plate 7, but also the inner diameter of the through portion 15b is narrower than the space portion 15a. It is. As a result, the gap when the fixing screw portion 11 is inserted into the through portion 15b is not too wide and is moderate, so that in addition to the effects obtained with the configuration shown in FIG. 3, the screwing operation is further facilitated. The effect of being able to be obtained.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above embodiment, the display device using the sidelight type backlight unit in which the light emitting unit is disposed in the vicinity of the edge of the light guide plate is described as an example. However, the present invention is not limited thereto, and the direct type It can also be applied to a display device using the backlight unit.

  In the above embodiment, the convex gap is formed by using the burring process and the female thread is cut into the gap. However, the present invention is not limited to this. For example, a method of forming a convex part on the back side of the back plate by a method instead of burring, cutting a male screw on the outer periphery of the convex part to form a convex screw part, cutting a female screw on the fixing screw part, and fastening both Of course you may adopt.

The display device according to the present embodiment described above can be summarized as follows.
(Appendix 1)
A display element for displaying an image or the like;
A surface illumination device disposed behind the display element and emitting light to the display element;
A back plate disposed behind the surface illumination device;
A convex thread portion formed in a convex shape toward the back side from the surface of the back plate facing the surface illumination device;
A heat dissipating fin that releases heat generated by the surface illumination device to the outside;
A mounting hole provided with a space part that includes the convex thread part and a through part that leads to the space part, formed in the heat radiating fin,
A display device comprising: a fixing screw portion that is screwed into the convex screw portion through the through hole of the mounting hole portion and fixes the heat radiation fin to the back plate.
(Appendix 2)
In the display device according to attachment 1,
The display device according to claim 1, wherein the inner wall of the space portion of the mounting hole portion is formed so as to substantially follow an outer wall contour of the convex screw portion.
(Appendix 3)
In the display device according to attachment 2,
The width of the penetration part of the attachment hole part is narrower than the space part.

It is sectional drawing which shows the structure of the display apparatus by one embodiment of this invention. It is a perspective view which shows the structure of the backplate of the display apparatus by one embodiment of this invention. It is a figure which shows the partial cross section cut | disconnected in the position of the AA of FIG. 2 in the state which mounted the heat sink on the backplate of the display apparatus by one Embodiment of this invention. It is a figure explaining the modification of one embodiment of this invention. It is a perspective view which shows the structure of the back plate of the conventional display apparatus. It is sectional drawing which shows the structure of the junction part of the backplate and the radiation fin of the conventional display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display element 2 Display apparatus cover 3 1st optical sheet 4 2nd optical sheet 5 Light guide plate 5a Light emission surface 6 Frame 7 Back plate 8 Light emission part 9 Reflection sheet 10 Radiation fin 11 Fixing screw part 15 Mounting hole part 17 Convex screw part 19 Gas space 20 Display device

Claims (2)

A display element for displaying images and the like;
A surface illumination device disposed behind the display element and emitting light to the display element;
A back plate disposed behind the surface illumination device;
A convex thread portion formed in a convex shape toward the back side from the surface of the back plate facing the surface illumination device;
A heat dissipating fin that releases heat generated by the surface illumination device to the outside;
A mounting hole portion formed in the heat radiation fin and including a space portion that includes the convex screw portion, and a through portion that communicates with the space portion with an inner diameter that is the same as or narrower than the space portion;
Before SL screwed with the convex thread portion passes through the through portion, a display device characterized by having a fixing screw portion for fixing said heat dissipating fin on the back plate. The display device according to claim 1,
The display device according to claim 1, wherein the inner wall of the space portion of the mounting hole portion is formed so as to substantially follow an outer wall contour of the convex screw portion.

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