JP2001222008A - Lamp unit for liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp unit for liquid crystal display device of high luminance. SOLUTION: In a liquid crystal display device equipped with a liquid crystal panel having printed circuit boards in the X and Y directions, a lamp unit 2 to illuminate the liquid crystal panel 1, a lamp cover 10 to protect and fix the lamp unit 2, a light guide plate unit 4 to uniformly illuminate the whole panel with the light from the lamp, a back cover 6 to support and fix the light guide plate unit 4, and frames 7a, 7b to fix the cover, the lamp cover 10 is provided with slit-like holes 9 for heat radiation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp unit of a liquid crystal display device which can be used as a display of a color television receiver or 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 structure 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, and 3 denotes a lamp unit 2.
4 is a light guide plate unit for uniformly irradiating the lamp light to the entire liquid crystal panel, 5 is a reflector for reflecting the lamp light in the direction of the light guide plate unit 4, and 6 is supporting the light guide plate unit 4. The back cover 7a, 7b is a frame for fixing the liquid crystal panel 1, the lamp unit 2, the lamp cover 3, the light guide plate unit 4, and the reflector 5.

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.

[0006]

In the liquid crystal display device, since the lamp is always turned on to display an image, the conventional liquid crystal display device has a high temperature around the lamp, 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.

[0007]

In order to solve the above-mentioned problems, the present invention provides a lamp cover for protecting and fixing a lamp unit of a liquid crystal display device, in which a slit-shaped through-hole for radiating heat is provided.

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

[0009]

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 that supports and fixes the light guide plate unit, and in a liquid crystal display device including a frame, the present invention can be implemented by providing slit-shaped through holes for heat dissipation in the lamp cover, A liquid crystal display device having this lamp unit can be used as a display device such as a color television receiver or a computer display device.

[0010]

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. The same components as those of the conventional example shown in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

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 protected and fixed by a lamp cover 10 provided with a slit-shaped through hole 9 while being supported by the frame 7b. The slit-shaped through-hole 9 provided in the lamp cover 10 is not particularly limited in shape, size, position, and number, and is a through-hole through which heat generated by the lamp can be radiated. It is only necessary that the lamp cover 10 is sufficiently protected, the strength of the lamp cover 10 itself is sufficiently maintained, and light leakage is small.

[0013]

As described above, the lamp unit of the liquid crystal display device of the present invention dissipates the heat generated by the lamp from the slit-shaped through holes provided in the lamp cover to increase the temperature of the lamp. Therefore, an effect of always providing a high-brightness image can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of the same.

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

FIG. 4 is an enlarged sectional view of a main part of the same.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Lamp unit 4 Light guide plate unit 5 Reflector 9 Slit-shaped through-hole 10 Lamp cover

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // F21Y 103: 00 G02F 1/1335 530

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 for uniformly irradiating the light of a lamp to the entire liquid crystal panel, a back cover for supporting and fixing the light guide plate unit, and a frame, a slit-shaped transparent plate for heat dissipation is provided on the lamp cover. A lamp unit for a liquid crystal display device, comprising a hole.