The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 1991
Filed:
Dec. 23, 1988
Alan R Henderson, Carlsbad, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A system for automatically achieving convergence of the individual color images emitted by a color projector (11). The system employs a test pattern generator (71) which generates a number of test patterns which are identical for each CRT of the projector (11). The test patterns are scanned across a light sensor (83) which produces an output signal each time a portion of the test pattern crosses the sensor (83). The output signal causes a scanner processor (91) to latch the positions at which respective crossings are detected. The differences in position of the respective test patterns at each location examined by the sensor (83) represents misconvergence of the individual color images at the respective location. These differences are determined and interpolated by an image processor (61) and stored in a memory (63) to generate correction signals for correcting the misconvergence. The same apparatus is also used to automatically correct for misconvergence during projector operation by examining test pattern disparities in small blacked out areas around points stored in memory during the initial misconvergence adjustment. Spatial gray scale correction is also automatically achieved by generating a correction signal which cancels the amplitude offset variations between spatial illumination profiles of flat field test patterns at 100% and 1% amplitude levels. Video gain adjustment is automatically achieved by generating a correction signal which cancels the amplitude offset variations between spatial illumination profiles of flat field test patterns at 100% and 60% amplitude levels.