Wedge shaped light guide providing enhanced polarized light to a

Details Wedge shaped light guide providing enhanced polarized light to a Wedge shaped light guide providing enhanced polarized light to a

1998-09-11

2000-09-26

Dudek, James A.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

362 31, 349 62, G02F 11335

Patent

active

061249068

ABSTRACT:
The invention is intended to reduce the weight of the entire unit, make it compact and prevent the emitted light from being in dark and bright stripes in a light guide unit for a back light of a liquid crystal display device. Further, this invention allows a prism sheet having a larger apex angle to be used. To this end, the light guide unit comprises a plurality of light guide films laminated on the light guide member. The sloped surface which is opposite to the incident surface of the light guide unit is formed with grooves each having an inclination of an angle related to Brewster angle. A prism sheet is further disposed with the side having apexes oriented to the light guide unit to deflect the light emitted from the light guide unit.

REFERENCES:
patent: 4914553 (1990-04-01), Hamada et al.
patent: 5303322 (1994-04-01), Winston et al.
patent: 5914760 (1999-06-01), Daiku

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