Video driver with automatic gray scale adjustment and...

Details Video driver with automatic gray scale adjustment and... Video driver with automatic gray scale adjustment and...

G - Physics

09

G

375/46

G09G 1/00 (2006.01) H04N 5/57 (2006.01)

Patent

CA 1204889

VIDEO DRIVER CIRCUIT AND METHOD FOR AUTOMATIC GRAY SCALE ADJUSTMENT AND ELIMINATION OF CONTRAST TRACKING ERRORS ABSTRACT OF THE DISCLOSURE An apparatus and method for the automatic setup of a CRT operating point, or dc signal level (black), as well as the contrast, or gain level (gray), of a video display by sampling the CRT signal level of the individual cathodes and locking the dc signal level to a common dc setup reference and gain level to a value determined by a common contrast control signal and gain reference. An apparatus and method in which a common brightness control signal is modulated by a common contrast control signal such that a brightness control pedestal is added to each video signal path of a video display whereby picture black level does not change with contrast.

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