Sheet type optical device and backlighting unit using the same

Details Sheet type optical device and backlighting unit using the same Sheet type optical device and backlighting unit using the same

1998-12-04

2000-11-21

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By refraction at beam splitting or combining surface

362 31, 362330, 362339, 349 61, 349 62, G02B 2712, F21V 704, F21V 500, G02F 11335

Patent

active

061511692

ABSTRACT:
A sheet type optical device that perpendicularly stands light beams progressing obliquely with respect to the plane of the sheet includes a transparent sheet made from a transmissive material and prisms formed in parallel on one surface thereof, the prisms having a vertical angle of about 50.degree. to 70.degree.. The light progressing obliquely with respect to the plane is perpendicularly stood by the prisms. The sheet type optical device is used to form a backlighting unit for a liquid crystal display panel or the like. The backlighting unit includes a light source, a light guide, and the sheet type optical device, and optionally includes a reflective plate, a diffusion panel and a protective film.

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