Non-speckle liquid crystal projection display

Details Non-speckle liquid crystal projection display Non-speckle liquid crystal projection display

1998-07-28

2000-09-19

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349 5, 349193, 359443, G02F 11333, G02F 11335

Patent

active

06122023&

ABSTRACT:
A non-speckle laser projection display composed of a liquid crystal material for the generation of a high resolution, non-speckle image. The projection display screen includes a liquid crystal material which is constructed in a highly scattered state when no drive voltage is applied. When a high frequency, low voltage signal is applied to the liquid crystal projection display screen, the liquid crystal molecules vibrate slightly at a frequency higher than 60 Hz, thereby causing the speckle pattern to change quickly, and causing the eye to smooth out and see no speckle. In addition, provided is a non-speckle laser display system in which included is a laser image source and the liquid crystal projection display screen.

REFERENCES:
patent: 3650608 (1972-03-01), Baker
patent: 4613207 (1986-09-01), Fergason
patent: 4699468 (1987-10-01), Harasim et al.
patent: 5416617 (1995-05-01), Loiseaux et al.
patent: 5473454 (1995-12-01), Blanchard

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