Back light, light guiding plate, method for manufacturing diffusion plate and light guiding plate, and liquid crystal display device

Abstract

The present invention relates to a backlight and a light guide plate, a method of manufacturing a diffuser and the light guide plate, and to a liquid crystal display apparatus, all enabling a cost reduction by reducing the parts count and curtailing unnecessary manufacturing processing. A diffuser 261 has a light distribution layer 181 including a prismatic surface wherein stripe grooves or asperities are arrayed in parallel with each other, a diffusion layer 182 containing diffusion elements 191 for diffusing incident light, and a light incidence control layer 271 including a prismatic surface wherein stripe grooves or asperities are arrayed in parallel on a side of fluorescent tubes 131. The diffusion layer 182 is formed from the same resin, and only the diffusion elements 191 are formed from a different resin. The prism of the light incidence control layer 271 is optimized so as to enhance the proportion, to light being reflected without entering the light incidence control layer 271, of light re-entering other parts of a surface of the light incidence control layer 271, in order to guide incident light toward the diffusion layer 182 efficiently. The present invention is applicable to a backlight of a liquid crystal display apparatus.

Description

TECHNICAL FIELD [0001] The present invention relates to a backlight and a light guide plate, a method of manufacturing a diffuser and the light guide plate, and to a liquid crystal display apparatus. Particularly, it is directed to a backlight and a light guide plate, a method of manufacturing a diffuser and the light guide plate, and to a liquid crystal display apparatus, all enabling a cost reduction by reducing the parts count and curtailing unnecessary manufacturing processing. BACKGROUND ART [0002] A liquid crystal display apparatus includes: a liquid crystal display device (called also an LCD panel) wherein two transparent glass substrates are stacked in alignment one upon another such that surfaces thereof, each having transparent electrodes, an alignment film, and the like laminated thereon, face to each other, and wherein liquid crystal is sealed between both substrates; a backlight, disposed below the liquid crystal display device, for supplying light to the liquid crystal...

AI Technical Summary

Benefits of technology

[0066] According to a first aspect of the present invention, in a liquid crystal display apparatus, a liquid crystal display device can be illuminated, particularly, with a reduced parts count, and satisfying a required light distribution performance.

[0067] According to a second aspect of the present invention, a diffuser can be manufactured. Particularly, a diffuser in which the diffusion layer and the light distribution layer are integrally formed can be manufactured with a simple method, using multi-layer extrusion molding and rolling.

[0068] According to a third aspect of the present invention, a diffuser can be manufactured. Particularly, a diffuser in which the light focusing layer, the diffusion layer, and the light distribution layer are integrally formed can be manufactured with a simple method, using multi-layered extrusion molding and rolling.

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Problems solved by technology

However, by using the lens film in order to increase display luminance, moire may occur on the display screen due to interference between the liquid crystal display device and the lens film.

In addition, when seen obliquely, the display screen may exhibit mirror-like glare.

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