Patent ID: 8072400

Claim:
A display device for correcting brightness inconsistencies among a plurality of pixels, comprising: (a) an active matrix organic EL display panel having the plurality of pixels arranged in a matrix, the matrix comprising a plurality of horizontal lines of pixels and a plurality of vertical lines of pixels; (b) a plurality of power supply lines for supplying power to pixels in the corresponding horizontal lines; (c) a plurality of gate lines for controlling write to pixels in the corresponding horizontal lines; (d) first means for selecting a pixel and the gate line connected to the selected pixel; (e) a gate driver for activating the selected gate line to enable write to the selected pixel; (f) a plurality of data lines for supplying data to pixels in the corresponding vertical lines; (g) a source driver for providing pixel data to the plurality of data lines, wherein the source driver writes measurement pixel data to the selected pixel in the selected row and black data to all other pixels in the selected row; (h) a first and a second power supply; (i) a plurality of first switches for switchably connecting the corresponding power supply lines to either the first or the second power supply; (j) a current measurement circuit for measuring a respective first current corresponding to the selected pixel and flowing in the second power supply when measurement pixel data is written to the selected pixel; (k) a line control circuit for controlling the first switches, wherein the line control circuit causes the power supply line corresponding to the selected gate line to be connected to the second power supply, and all other power supply lines to be connected to the first supply; (l) a signal generating circuit for controlling the line control circuit, gate driver and source driver to measure the current of the selected pixel; (m) second means for selecting each of the plurality of pixels in a selected first order to measure the respective first current corresponding to each of the plurality of pixels; (n) third means for receiving a respective input image signal corresponding to each pixel and calculating respective corrected image data for each pixel using the respective first current corresponding to each pixel; and (o) fourth means for supplying the corrected image data to each pixel to correct brightness inconsistencies among the plurality of pixels.