Patent ID: 7986291
Filing Date: 2011-07-26
Classification: G09G

Abstract:
1. A method of driving a display including an array of display elements, each element comprising red, green, blue and white colors, said method comprising the steps of: (a) receiving input signals for controlling red, green and blue colors of each element of the display; (b) processing the input signals to generate corresponding red, green, blue and white output drive signals for the red, green, blue and white sub-pixels of each element, said output drive signals being enhanced according to a gain factor for increasing element luminosity subject to potential color saturation occurring at one or more of the elements being addressed by selectively reducing color saturation at said one or more of said elements; and (c) applying said output drive signals to respective sub-pixels for each element of the display, wherein processing in step (b) comprises the steps of: (d) computing for each element a maximum potential optical transmission therethrough; (e) scaling the input signals for each element according to the maximum optical transmission therethrough computed in step (d); (f) computing a minimum value of the scaled input signals from step (e); (g) computing intermediate signals for the scaled input signals from step (e) in relation to the minimum value from step (f) for each element; (h) computing a maximum value of the computed intermediate signals from step (g) for each element; (i) computing surpluses from step (g) in relation to the maximum value from step (h) for each element; (j) computing a difference between the computed surpluses from step (i) in relation to the intermediate signals from step (g) to generate output drive signals for the red, green and blue sub-pixels of each element; (k) computing a luminance value from the scaled computed surplus from step (i) and the minimum value from step (f); and (l) applying the luminance value from step (k) to generate the white output drive signal to control optical output of the white sub-pixel, and applying the output drive signals from step (j) to control optical output from the red, green and blue sub-pixels for each element.