Patent ID: 6972745

Claim:
An apparatus for improving image quality of a liquid crystal display (LCD) comprising a matrix of pixels arranged in a plurality of rows and columns, wherein an intersection of a row and a column defines a position of a pixel in the matrix, said apparatus comprising: at least one digital-to-analog converter (DAC) having a digital input and an analog output; a plurality of column switches adapted for coupling the analog output of said at least one DAC to each of a plurality of columns of a matrix of pixels of a liquid crystal display (LCD); a plurality of row switches adapted for selectively coupling each of a plurality of rows to said plurality of columns; column control logic for controlling said plurality of column switches; row control logic for controlling said plurality of row switches; a video frame to gray scale conversion and pixel address logic for converting video information into LCD gray scale values and corresponding pixel address locations thereof; and video data comparator/modifier logic, said video data comparator/modifier logic adapted to receive the LCD gray scale values for each pixel of the matrix of pixels, wherein gray scale values of adjacent pixels are compared and if a difference in magnitudes between the gray scale values of adjacent pixels is greater than a desired value, then at least one of the gray scale values is modified so that the difference in magnitudes therebetween is no greater than the desired value; said video data comparator/modifier logic is adapted for sending all unmodified gray scale values and any modified gray scale values to said at least one DAC; said video frame to gray scale conversion and pixel address logic adapted for sending said pixel address locations to said column control logic and said row control logic.