Self-masking viewing apparatus

Details Self-masking viewing apparatus Self-masking viewing apparatus

1996-05-28

1999-01-12

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

40361, G02F 11335

Patent

active

058596763

ABSTRACT:
A transparency viewing device including a faceplate adapted for mounting at least one transparency thereon, an LCD array defining an array of pixels, a driver which selectively varies the transparency of the pixels, a source of back illumination for the LCD array wherein the LCD is substantially effective to effectively block light within a relatively limited range of angles around the normal to the LCD and is relatively ineffective to block light reaching it from angles outside the limited range of angles and a light detector which views the array from an angle outside the range of angles at which the LCD is substantially effective to block the light.

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