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:
Apr. 20, 2004
Filed:
Jun. 08, 2001
William R. Markis, Spencerport, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An apparatus and method for calibration of each individual driver channel in a multichannel driver circuit for a spatial light modulator used in an image display apparatus. A separate calibration sequence is initiated in which, for each positive and negative half-cycle of the driver circuit, a ramped voltage, applied as the drive circuit voltage ( ), is compared against a standard black-video drive voltage. When the ramped voltage equals the standard drive voltage, calibration for this half-cycle is complete and a digital value corresponding to a correction component of the ramped voltage is stored in memory ( ). The process is duplicated for each positive and negative half-cycle of the drive voltage signal ( ). For gain calibration, a ramped voltage is applied as the drive circuit voltage and compared against a standard white-video signal level. When the ramped voltage equals the standard white-video signal level, gain calibration is computed and the digital value for gain correction is stored in memory ( ). Display driver voltages are thereby calibrated so that, for each driver channel, the spatial light modulator is presented with a substantially equal black-video level and a controllable white-video level.