JPH09105935A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily replace a fluorescent tube and also to reduce the number of parts. SOLUTION: A cover 13 is detachably attached to an opening part 12 formed in a lower case 1 in order to replace the fluorescent tube 9. And, the prescribed inner surfaces of an upper case 2 and the cover 13 are reflective surfaces 21 and 22 so as to make the light from the fluorescent tube 9 incident on one end face 6a of the light transmission plate 6 without dispersing the light. Thus, it is unnecessary to prepare a reflection film wound around the fluorescent tube 9, so that the reflection film doesn't obstruct at replacing the fluorescent tube 9.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art Some liquid crystal display devices have a backlight unit on the back side of the liquid crystal display panel because the liquid crystal display panel itself does not have a self-luminous ability. FIG. 3 shows a part of an example of such a conventional liquid crystal display device. This liquid crystal display device has a structure in which a backlight unit 3 and a liquid crystal display panel 4 are housed in this order between a lower case 1 and an upper case 2. Of these, the liquid crystal display panel 4 is not shown in detail,
A liquid crystal is sealed between two transparent substrates 4a and 4b. A display window 5 is provided in a portion of the upper case 2 corresponding to the display area of the liquid crystal display panel 4.

The backlight unit 3 has a light guide plate 6 whose upper surface serves as a light emitting surface, a reflection plate 7 attached to the lower surface of the light guide plate 6, and a diffusion plate 8 attached to the upper surface of the light guide plate 6.
And a fluorescent tube 9 arranged on one end side of the light guide plate 6, and a reflection film 10 arranged around the fluorescent tube 9 and having both ends attached to the outer surfaces of one end of the reflection plate 7 and the diffusion plate 8. It consists of Of these, the fluorescent tubes 9 are detachably attached to the bases 11 (not shown) provided at both ends of the fluorescent tubes 9 at predetermined two locations on the inner surface of the upper case 2. The reflection film 10 is for allowing the light from the fluorescent tube 9 to enter the one end face 6 a of the light guide plate 6 without being scattered. The light guide plate 6 is for internally reflecting the light incident from the one end surface 6a and causing the upper surface to emit light.
The reflection plate 7 is for preventing light from leaking from the lower surface of the light guide plate 6. The diffusion plate 8 is for diffusing the light emitted from the upper surface of the light guide plate 6 to make the brightness uniform. Then, the light diffused by the diffusion plate 8 is applied to the lower surface (back surface) of the liquid crystal display panel 4.

By the way, since the life of the fluorescent tube 9 is shorter than that of the liquid crystal display panel 4 or the like, an opening 12 is provided at a predetermined position of the lower case 1 so that the fluorescent tube 9 can be replaced. The cover 13 is detachably attached to the opening 12 by a screw or hook method. When replacing the fluorescent tube 9, first, the cover 13 is removed, and then a predetermined one end of the reflection film 10 is peeled off from the outer surface of the one end of the reflection plate 7, then the fluorescent tube 9 is replaced, and then the reflection film 10 is replaced. The predetermined end of the reflector 7
It is attached again to the outer surface of one end of the above, and then the cover 13 is attached. When assembling the liquid crystal display device at the factory, when the fluorescent tube 9 is to be incorporated, the base of the fluorescent tube 9 is fitted into the base receiving member 11 with the cover 13 removed, and then the predetermined portion of the reflecting film 10 is fitted. Reflector 7 at one end
It is attached to the outer surface of one end of the.

[0005]

As described above, in the conventional liquid crystal display device, when the fluorescent tube 9 is assembled, the reflective film 1 is inserted after the base of the fluorescent tube 9 is fitted into the base receiving member 11.
Although a predetermined one end of 0 is attached to the outer surface of the one end of the reflection plate 7, there is a problem that this work is extremely troublesome. Further, since the reflective film 10 is used, there is a problem that the number of parts is large and the cost is high. An object of the present invention is to make it possible to easily incorporate a fluorescent tube and reduce the number of parts.

[0006]

According to the present invention, a light guide plate having an upper surface serving as a light emitting surface, a light emitter disposed on one end side of the light guide plate, and an upper surface side of the light guide plate are disposed in a case. And a liquid crystal display panel that accommodates the light-emitting body, and the light-emitting body is detachable via an opening provided in the case,
In addition, in a liquid crystal display device in which a cover is detachably attached to the opening of the case, the inner surfaces of the case and the cover around the light emitter housed in the case are reflection surfaces.

According to the present invention, since the predetermined inner surfaces of the case and the cover are used as the reflecting surface, the conventional reflecting film is unnecessary, and therefore, the luminous body such as the fluorescent tube can be easily incorporated and the number of parts is reduced. Can be reduced.

[0008]

FIG. 1 shows a main part of a liquid crystal display device according to an embodiment of the present invention. In this figure, the same reference numerals are given to the same parts as those in FIG. 3, and the description thereof will be omitted as appropriate. In this liquid crystal display device, a fluorescent tube (light emitter) housed between the lower case 1 and the upper case 2 is used.
The inner surface of the upper case 2 and the cover 13 around at least 9 has a structure in which at least the fluorescent tube 9 side of the one end surface 6a of the light guide plate 6 is defined as the reflecting surfaces 21 and 22. in this case,
The portions of the reflecting surfaces 21 and 22 facing the predetermined outer peripheral surface of the fluorescent tube 9 are arcuate surfaces along the outer peripheral surface of the fluorescent tube 9. When the upper case 2 and the cover 13 are made of resin, the predetermined inner surfaces of the upper case 2 and the cover 13 may be used as the reflecting surfaces 21 and 22 by simply forming the upper case 2 and the cover 13 with white resin. Alternatively, the reflecting surfaces 21 and 22 may be formed by a method such as painting or metal deposition.
Further, the upper case 2 or the cover 13 may be made of metal. The lower case 1 may be made of resin or metal.

As described above, in this liquid crystal display device, the predetermined inner surfaces of the upper case 2 and the cover 13 are connected to the reflecting surfaces 21 and 2.
Since the reflection surfaces 21 and 22 do not scatter the light from the fluorescent tube 9, one end surface 6 of the light guide plate 6 is used.
It can be made incident on a. As a result, the conventional reflective film becomes unnecessary. Therefore, for example, when replacing the fluorescent tube 9, the cover 13 may be removed first, then the fluorescent tube 9 may be replaced, and then the cover 13 may be attached, so that the fluorescent tube 9 can be easily replaced. In addition, the number of parts can be reduced and the cost can be reduced because the conventional reflection film is unnecessary.

As shown in FIG. 2, for example, the reflecting surface 2
Predetermined parts of the arcuate surfaces 1 and 22 are provided with uneven surfaces 21a and 22a.
It may be. In this case, the uneven surface 21
Since the light from the fluorescent tube 9 is diffusely reflected by a and 22a, the amount of light returning to the fluorescent tube 9 among the light reflected by the reflecting surfaces 21 and 22 is reduced, and the one end surface 6a of the light guide plate 6 is reduced.
The amount of light incident on can be increased.

[0011]

As described above, according to the present invention, since the predetermined inner surfaces of the case and the cover are used as the reflecting surface, the conventional reflecting film is unnecessary, and therefore, the light emitting body such as the fluorescent tube can be easily assembled. Moreover, the number of parts can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a liquid crystal display device according to another embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of an example of a conventional liquid crystal display device.

[Explanation of symbols]

 1 Lower Case 2 Upper Case 4 Liquid Crystal Display Panel 6 Light Guide Plate 9 Fluorescent Tube (Light Emitting Body) 12 Opening 13 Covers 21, 22 Reflecting Surface

Claims (3)

[Claims] 1. A case is provided with a light guide plate having an upper surface serving as a light emitting surface, a light emitter arranged at one end of the light guide plate, and a liquid crystal display panel arranged on the upper surface side of the light guide plate. At the same time, in the liquid crystal display device, wherein the light-emitting body is detachably attached through an opening provided in the case, and a cover is detachably attached to the opening of the case, the liquid crystal display device being housed in the case. A liquid crystal display device, wherein an inner surface of the case and the cover around a light emitting body is a reflecting surface. 2. The liquid crystal display device according to claim 1, wherein the reflection surface, which is an inner surface of the case and the cover, has an arc surface along an outer peripheral surface of the light emitting body. 3. The invention according to claim 1, wherein the reflecting surface, which is an inner surface of the case and the cover, has an arcuate surface extending along an outer peripheral surface of the light-emitting body, and a predetermined part of the arcuate surface is formed. A liquid crystal display device having an uneven surface.