Backlight unit

Abstract

To provide a backlight unit for use in a liquid crystal display device and so on, which is capable of overcoming a problem of interference due to expansion and contraction of a light guide plate and an optical sheet and preventing a strange noise by clicking, a backlight unit includes a support plate, a light guide plate that is disposed in the front side of the support plate and emits light, which is introduced from a light source through the end side of the light guide plate, through the front side of the light guide plate, an optical sheet that is disposed in the front side of the light guide plate, and a liquid crystal panel maintenance member that is disposed in the front side of the optical sheet, wherein the light guide plate and the liquid crystal panel maintenance member hold and fix the optical sheet at one point.

Description

technical field [0001] The present invention relates to a backlight unit used in liquid crystal display devices and the like. Background technique [0002] Backlight units of liquid crystal display devices are generally classified into an edge light type and a direct light type. The edge light type is mainstream for relatively small-sized liquid crystal display devices used in car navigators, mobile phones, and the like. In the edge light type backlight unit, the light introduced into the photoconductor through the end of the photoconductor is emitted from the front surface of the photoconductor, and the luminous flux is adjusted by means of the optical sheet to obtain desired surface light. A light guide plate or an optical sheet is fixed (maintained) on a support plate or a case (hereinafter referred to as a "support plate, etc."), but in conventional backlight units, the use of through holes provided in the optical sheet by means of screws, etc., is adopted. A method of...

AI Technical Summary

Problems solved by technology

However, such a backlight unit using a large light guide plate and an optical sheet has a problem that when the backlight unit is used in an environment where the temperature difference varies greatly, such as inside a vehicle, due to the expansion and contraction of the light guide plate and the optical sheet, The backlight unit may be bent and deformed

In other words, when large light guide plates and optical sheets are used, there arises a problem that these members expand to interfere with each other or other adjacent members such as support plates, and therefore, sufficient measures need to be taken to prevent such problems

[0006] In addition, when the gap is made large, foreign matter such as dust is likely to penetrate into the gap

The infiltration of foreign matter is undesirable because it has an effect on the optical characteristics of the backlight unit, which may lead to the generation of stray light and deterioration of brightness

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