Backlight system for liquid crystal display comprising prism len

Details Backlight system for liquid crystal display comprising prism len Backlight system for liquid crystal display comprising prism len

1997-07-18

2000-01-04

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 64, 349 65, 349 67, 349 95, 349112, 349113, G02F 11335

Patent

active

060116013

ABSTRACT:
A liquid crystal display comprises a liquid crystal display device (30), a backlight system (20) provided with a prism lens sheet (10). The lens sheet comprises a transparent base sheet (11), and a lens sheet formed integrally with the base sheet and provided with a plurality of parallel unit lenses (12). Each of the unit lenses (12) has a cross section of a shape of an isosceles triangle having an apex angle (.alpha.) in the range of 80.degree. to 87.degree., and is made of a radiation setting resin having a refractive index in the range of 1.57 to 1.59. The prism lens sheet has a half-brightness viewing angle of 65.degree. or below, and the difference between the half-brightness viewing angle and a brightness-curve inversion angle is 20.degree. or above to prevent information displayed on the screen of the liquid crystal display from being seen sidewise by others.

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patent: 5808784 (1998-09-01), Ando et al.
patent: 5841572 (1998-11-01), Ando et al.

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