Patent ID: 7764252

Claim:
An electroluminescent display system, comprising: a) a display composed of an array of regions, wherein the current to each of the regions is provided by a different pair of power lines, each having a resistance, and wherein each region includes an array of light emitting elements for emitting light and wherein the current provided to each light-emitting element is affected by the resistance of at least one of the corresponding power lines, the position of each light-emitting element along at least one of the corresponding power lines, and the current provided to other light-emitting elements within the array of light-emitting elements; b) a pixel driving circuit for independently controlling the current to each light-emitting element in response to an image signal, wherein the intensity of the light output by the light emitting elements is dependent upon the current provided to each light emitting element; and c) a display driver for receiving an input image signal and generating a converted image signal for driving the light emitting elements in the display, wherein the display driver: i) analyzes the input image signal to estimate the current that would result at at least one point along at least one of the power lines providing current to each of the regions, if employed without further modification, based upon device architecture, material and performance characteristics of device components, and the input image signal; and ii) generates the converted image signal as a function of the input image signal and the estimated currents; and wherein when i) the input image signal includes a target area of desired uniform luminance that spans two or more regions and ii) the average input image signal for light emitting elements outside the target within one of the two or more regions is significantly higher than the average input image signal for light emitting elements outside the target within another of the two or more regions, the display driver modifies the input image signal such the average input image signal for light emitting elements outside the target is reduced or the input image signal for light-emitting elements within the target area and within the region having the significantly higher average input image signal is increased, so that the luminance pattern that results from displaying the image is more uniform in the target area when the converted image signal is used for driving the light emitting elements of the display than when the input image signal is used for driving the light emitting elements of the display.