Polarizing illumination device and projection display device

Details Polarizing illumination device and projection display device Polarizing illumination device and projection display device

1998-12-02

2000-07-25

O'Shea, Sandra

Illumination

With polarizer

362331, 362268, 362293, 353 31, 353 46, 353 20, 359487, 359483, 349 66, 349 95, F21V 914, G02B 530

Patent

active

060929014

ABSTRACT:
A polarizing illumination device and a projection display device using the polarizing illumination device improve light utilization efficiency. Polarizing conversion elements are placed so that one of polarizing separation films of a first polarizing conversion element and one of polarizing separation films of a second polarizing conversion element are close to each other and so that effective incident areas and ineffective incident areas are alternately arranged in the x direction. The width WP in the x direction of the effective incident areas and the ineffective incident areas is set to be larger than half of the width WL in the x direction of small lenses in a second lens array. The optical axes of each of small lenses are offset from the lens centers thereof so that partial beams emerging from the small lenses in a first lens array optimally enter the effective incident areas where the partial beams should enter.

REFERENCES:
patent: 5452128 (1995-09-01), Kimura
patent: 5748369 (1998-05-01), Yokota

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