JPH1010534A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the temperature of a lamp from rising by forming a slit for heat radiation in a lamp cover. SOLUTION: A liquid crystal panel 1 and a light guide plate unit 4 are supported by frame bodies 7a and 7b and further the unit 4 is fixed to the frame body 7b by a reverse cover 6 with, for example, a screw 8. A reflector 5 is fitted to a lamp unit 2 itself or light guide plate unit 4 while covering the lamp unit 2. The lamp unit 2 is protected and fixed by the lamp cover 10 provided with the slit 9 while supported on the frame body 7b. The slit 9 is a through hole which can radiate heat, and the lamp unit 2 is only protected to maintain sufficient strength of the cover 10 itself and actualize a small light leak. The heat generated by the lamp is radiated from the slit 9 for heat radiation formed in the lamp cover 10 to prevent the temperature of the lamp from rising, thereby obtaining an image with high luminance at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device which can be used as a display such as a color television receiver and a computer display device.

[0002]

2. Description of the Related Art In recent years, applications of liquid crystal display devices, such as computer display devices, have been widespread, but there is a problem that the brightness is inferior to that of a cathode ray tube and is dark.

[0003] The structure of a conventional liquid crystal display device will be described below. FIG. 3 is an exploded perspective view showing the internal configuration of a conventional liquid crystal display device. In FIG. 3, reference numeral 1 denotes a liquid crystal panel having a printed board in the X and Y directions, 2 denotes a lamp unit for illuminating the liquid crystal panel 1, 3 denotes a lamp cover for protecting and fixing the lamp unit 2, and 4 denotes a lamp. A light guide plate unit for uniformly irradiating light to the entire liquid crystal panel, 5 is a reflector for reflecting light of the lamp in the direction of the light guide plate unit 4, 6 is a back cover for supporting and fixing the light guide plate, 7a,
A frame 7b fixes the liquid crystal panel 1, the lamp unit 2, the lamp cover 3, the light guide plate unit 4, and the reflector 5 described above.

FIG. 4 is a sectional view of the liquid crystal display device, in which a liquid crystal panel 1, a lamp unit 2, a lamp cover 3, a light guide plate unit 4, and a back cover 6 are fixed by a stacking frame 7b. The light emitted from the lamp is reflected by the reflector 5
Is reflected in the direction of the light guide plate unit 4 by the light guide plate unit 4.
Illuminates the entire liquid crystal panel uniformly and displays an image.

[0005]

In the liquid crystal display device, since an image is displayed by constantly turning on the lamp, the surrounding area of the conventional liquid crystal display device becomes high in heat, and furthermore, the reflector 5 and the lamp cover 3 make the heat around the lamp. Since the lamp unit 2 is covered, heat is easily trapped. In addition, the retained heat raises the temperature of the lamp itself. FIG. 5 shows the relationship between the lamp temperature and the luminance. As can be seen from FIG.
The brightness increases with respect to the ambient temperature of the lamp up to about 40 ° C., but when the temperature exceeds 40 ° C., there is a characteristic that the brightness decreases as the ambient temperature increases. When the lamp is lit, the temperature actually rises to about 50 ° C. or more, so that there is a problem that it is not always possible to maintain high luminance. An object of the present invention is to solve the above-described problems of the conventional example.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a lamp cover provided with a slit for radiating heat.

Accordingly, heat generated in the lamp unit can be released from the lamp cover to the outside through the slit, and the temperature of the lamp can be prevented from rising.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION
A liquid crystal panel having a printed board in the X and Y directions, a lamp unit for illuminating the liquid crystal panel, a lamp cover for protecting and fixing the lamp unit, and a light guide plate unit for uniformly irradiating lamp light to the entire liquid crystal panel And a back cover for supporting and fixing the light guide plate unit, and a liquid crystal display device having a frame, which can be implemented by providing a heat dissipation through-hole in the lamp cover. It can be used as a display device such as a television receiver or a computer display device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a liquid crystal display device, and FIG. 2 is a sectional view thereof. Note that the same components as those in the conventional example shown in FIGS.

The liquid crystal panel 1 and the light guide plate unit 4 include a frame 7
a light guide plate unit 4 is fixed to the frame body 7b by a back cover 6, for example, with screws 8. The reflector 5 covers the lamp unit 2 itself or the light guide plate unit 4 so as to cover the lamp unit 2.
Attached to. The lamp unit 2 is supported by the frame 7b and the lamp cover 1 provided with the slit 9 is provided.
Protected by 0 and fixed. The slit 9 provided in the lamp cover 10 is not particularly limited in shape, size, position and number, and is a through hole capable of dissipating heat. The slit 9 is sufficiently protected, and the lamp cover 10 itself is protected. It is sufficient that the intensity of the light is sufficiently maintained and the light leakage is small.

[0012]

As described above, in the liquid crystal display device of the present invention, the heat generated by the lamp is dissipated from the heat dissipation holes provided in the lamp cover to prevent the temperature of the lamp from rising, and to always provide high brightness. Image can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display device.

FIG. 3 is an exploded perspective view of a conventional liquid crystal display device.

FIG. 4 is a sectional view of the same.

FIG. 5 is a characteristic diagram showing a relationship between lamp temperature and luminance.

[Description of Signs] 1 Liquid crystal panel 2 Lamp unit 4 Light guide plate unit 5 Reflector 9 Slit 10 Lamp cover

Claims (1)

[Claims] 1. A liquid crystal panel having a printed board in X and Y directions, a lamp unit for illuminating the liquid crystal panel, a lamp cover for protecting and fixing the lamp unit,
In a liquid crystal display device including a light guide plate unit that uniformly irradiates the light of the lamp to the entire liquid crystal panel, a back cover that supports and fixes the light guide plate unit, and a liquid crystal display device including a frame, the lamp cover is provided with a through hole for heat radiation. A liquid crystal display device characterized by the above-mentioned.