Gray level addressing for lcds

Details Gray level addressing for lcds Gray level addressing for lcds

G - Physics

09

G

G09G 3/36 (2006.01) H04N 5/14 (2006.01) H04N 9/12 (2006.01)

Patent

CA 2095978

GRAY LEVEL ADDRESSING FOR LCDS ABSTRACT OF THE DISCLOSURE Method and apparatus for providing gray level addressing for passive liquid crystal display (LCD) panels having overlapping row and column electrodes defining pixels are disclosed. Depending upon whether the rows are being addressed by "standard" or "Swift" addressing, the signals for applying to the column electrodes are determined by different calculations, in all of which modes the amplitudes of the column signals are related to the gray level desired to be displayed by the individual pixels. For a split interval system, column signals of appropriate amplitude and polarity are applied during different subintervals of a characteristic time interval of the display panel depending upon the method of addressing the rows. In the full interval mode, the column signals applied over a full time interval are based on the desired gray level of all the pixels in the column, adjusted to provide the proper rms voltage across all the pixels so that they display the desired gray levels.

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