Patent ID: 8035586
Filing Date: 2011-10-11
Classification: G09G

Abstract:
1. A device for driving an active matrix light-emitting display panel in which light-emitting elements which exhibit different emission colors are arranged in a form of a matrix as display pixels, and at least control transistors and light-emitting drive transistors to selectively luminescently drive the light-emitting elements are arranged for the display pixels, respectively, gates of the control transistors being connected to a gate driver through scan selecting lines, sources of the control transistors being connected to a data driver through data lines, sources of the light-emitting drive transistors being connected to power supply lines, drains of the light-emitting drive transistors being connected to anodes of the light-emitting elements, drive voltages being supplied to the power supply lines from DC-DC converters comprising: a voltage detector which detects a maximum voltage among the drive voltages applied to the light-emitting elements in the display pixels through the power supply lines, wherein values of the drive voltages are designed to be controller with respect to forward voltages of the light-emitting elements which exhibit different emission colors, respectively; and a voltage controller which controls output levels of control voltages supplied to the gates of the control transistors based on the maximum voltage detected by the voltage detecting means, wherein the voltage controller is constituted by a charge pump which adds a predetermined voltage to the maximum voltage detected by the voltage detector; wherein said detected voltage is indicative of a voltage at a drain or source of the drive transistors.