Projection apparatus with a polarizer, glass panel, and quarter-

Details Projection apparatus with a polarizer, glass panel, and quarter- Projection apparatus with a polarizer, glass panel, and quarter-

1997-03-03

1998-12-01

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 98, 349117, G02F 11335

Patent

active

058446370

ABSTRACT:
A semiconductor device can be prevented from mal-functioning by interrupting reflected beam. Polarizing plates (1), (3) are disposed at beam entrance and exit sides, respectively of a transmission liquid-crystal display device (2) as polarizers. Beam from the polarizing plate (3) has the change of light and shade presented in accordance with a video signal. An optical isolator using a quarter-wave plate (4) is disposed at the beam exit side of the polarizing plate (3). A glass panel (5) such as an optical filter is disposed at the beam exit side of the quarter-wave plate (4), whereby beam from the polarizing plate (3) is converted into linearly-polarized beam having an arbitrary plane of polarization. When this linearly-polarized beam is introduced into the optical isolator using the quarter-wave plate (4), inputted linearly-polarized beam is converted into circularly-polarized beam by action of the quarter-wave plate (4). The thus converted circularly-polarized beam is irradiated on the glass panel (5).

REFERENCES:
patent: 3942872 (1976-03-01), Saeva
patent: 4025161 (1977-05-01), LaRoche
patent: 5157523 (1992-10-01), Yamagishi et al.
patent: 5371617 (1994-12-01), Mitsutake et al.
patent: 5532852 (1996-07-01), Kalmanash
patent: 5570215 (1996-10-01), Omae et al.

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