Liquid crystal display device

Abstract

Is disclosed a liquid crystal display device in which a lamp chamber and a liquid crystal display panel chamber partitioned by a light diffusion plate communicate with each other and further with the ambient air through vents to prevent the occurrence of deformation of the light diffusion plate. <??>The liquid crystal display device is provided with a shield portion (1) with a reflecting sheet (6) placed thereon for reflecting light generated from lamps (5) accommodated therein, a light diffusion plate (2) and / or an optical sheet (3), wherein the light diffusion plate (2) an / or the optical sheet (3) are provided each in a marginal portion with at least a vent (2a, 3a) and the shield portion is also provided in its marginal portion corresponding to the vents (2a, 3a) with a vent (1a) open to the ambient air. An air passage through the vents (2a, 3a) communicating the lamp chamber (30) accommodating the lamps with the LCD panel chamber (31) containing the LCD panel and communicating through the vent (1a) with the ambient air is thus formed inside the LCD device.

Description

technical field [0001] The present invention relates to a liquid crystal display device, and particularly relates to a technique for preventing deformation of a light diffusion plate or an optical sheet arranged in front of a backlight lamp. Background technique [0002] Japanese Unexamined Patent Publication No. 10-106315 describes a prior art for improving heat dissipation of liquid crystal display devices. This publication discloses the following technology: the liquid crystal display device is divided into two chambers through a reflector plate, the chamber on the side of the liquid crystal panel is sealed to prevent dust from entering, and the other chamber on the back side of the reflector plate is provided with an air vent. The chamber on the back side of the reflector was cooled, and then the chamber on the liquid crystal panel side was cooled. [0003] figure 1 It is a structural schematic diagram of the prior art. The liquid crystal display device is composed of...

AI Technical Summary

Problems solved by technology

Due to the difference in air pressure, there is a problem that there is a danger of deforming the light diffusion plate 2 and the optical sheet 3.

That is, if it is considered that the liquid crystal display device is activated and the lamp is in a heating state, due to the thinning, the rigidity is weakened, and the diffusion plate or the optical sheet may be deformed such as bending or warping. Therefore, mechanical contact with the liquid crystal panel or occurrence of The brightness of the LCD panel is uneven

[0009] In addition, the technology disclosed in the above-mentioned Japanese Patent Laid-Open No. 11-337942 is to absorb the thermal expansion of the light diffusion plate in a high-temperature environment, leaving room for the positioning of the light diffusion plate, but it is not aimed at the rear side chamber through the light diffusion plate. Air pressure difference technology with the front side chamber

In addition, in this publication, the light guide plate is arranged on the back side of the light diffusion plate. From this point of view, the backlight system does not presuppose the direct type backlight system.

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