Patent · US Expired

Self-masking viewing apparatus

US5859676A · kind A · utility

2Cited by

39References

30Claims

0Family size

Assignee

Smartlight Ltd. · IL

Inventors

Dan Inbar · Haifa, IL
Hanan Wolf · Haifa, IL
Benzion Levy

Key dates

Filing date	May 28, 1996
Grant date	Jan 12, 1999
Priority date	—
Expiry date	May 28, 2016

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/13336
WIPO fieldOptics
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.