Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-05-05
1988-12-13
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315383, 315 1311, H01J 2952, H01J 2956
Patent
active
047913398
ABSTRACT:
An electrical circuit compensates for spatial variations in the light transmittance of the target surface (45) of an electron beam-addressed liquid crystal light valve (10). Such variations in light transmittance, which stem in part from the position dependent angle of incidence of the writing beam electrons and position dependent alignment layer variations arising out of manufacturing process limitations, affect the ability to achieve a monotonic gray scale luminance over the display surface. The compensating circuit adjusts the amount of beam current of the writing electron beam by varying the gain and offset voltage of the video signal, which modulates the writing beam current. This is accomplished by applying the X and Y scan position signals to a correction signal generator (102), which produces gain correction and offset correction signals whose magnitudes vary in response to instantaneous scan position of the writing electron beam on the target surface of a particular light valve. The gain correction and offset correction signals alter the character of the video signal, which is then delivered to the Z-axis driver of the writing beam-producing cathode ray tube.
REFERENCES:
patent: 3191090 (1965-06-01), Vitt, Jr. et al.
patent: 4196446 (1980-04-01), Rowe et al.
patent: 4461983 (1984-07-01), Lees
Haven, Duane; Electron Beam Addressed Liquid Crystal Light Valve; Proc. of the SID, vol. 24/2, 1983.
Lazarchick, Jr., "Intensity Fallout Corrector", IBM Technical Disclosure, vol. 7, No. 2, Jul. 1964, pp. 128-129.
Blazo Stephen F.
Draz Arthur J.
Whitlow Dana E.
Angello Paul S.
Blum Theodore M.
Issing Gregory C.
Tektronix Inc.
Winkelman John D.
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