Circuit and method for driving OLED display

摘要

A circuit for driving an organic light emitting diode display includes a display panel that displays an image by using organic light emitting diodes disposed at intersection areas of a plurality of gate lines and a plurality of data lines; a threshold voltage detection control unit that supplies a precharge voltage by sequentially turning on transistors for threshold voltage detection, which are connected among the data lines and the organic light emitting diodes on the display panel, in units of horizontal lines, and enables threshold voltages to be detected; and a source driver that detects threshold voltages of all organic light emitting diodes arranged on a corresponding horizontal line, and repeats an operation, as necessary, for sampling/holding the detected threshold voltages through M sample/hold circuits, converting the sampled/held threshold voltages into digital signals, and storing the digital signals in a memory.

主权项

1. A circuit for driving an organic light emitting diode display, comprising:
a source driver that provides data signals to organic light emitting diodes of a display panel and detects variation in threshold voltages of the organic light emitting diodes to compensate the data signals based on the detected threshold voltages, wherein the source driver comprises: N multiplexers for input that selectively output data signals or precharge voltages; N buffers that buffer the data signals or the precharge voltages which are outputted from the N multiplexers for input, and output the buffered data signals or precharge voltages to data lines; M multiplexers for sample/hold each including input channels connected to k data lines of the data lines and at least one output terminal to which the input channels are sequentially connected, wherein the input channels receive threshold voltages of organic light emitting diodes through the k data lines from the organic light emitting diodes, and a selected threshold voltage is outputted through the at least one output terminal; and M sample/hold circuits each connected with the at least one output terminal of corresponding one of the M multiplexers for sample/hold to sample/hold the selected threshold voltage provided from the corresponding one of the M multiplexers for sample/hold, wherein ‘M’ is greater than one and less than ‘N’.