Circuit and method for driving OLED display

A method for driving an organic light emitting diode display, comprising:

• precharging organic light emitting diodes on a currently selected horizontal line through N data lines;
• reading M threshold voltages provided from data lines through a first channel from the light emitting diodes by using M multiplexers for sample/hold each of which includes input channels connected to k data lines;
• sampling/holding the read M threshold voltages provided from the M multiplexers for sample/hold in sample/hold circuits corresponding to the M multiplexers for sample/hold in a one-to-one manner;
• converting the sampled/held threshold voltages into digital signals through an analog-to-digital converter, and storing the digital signals in a memory;
• sequentially reading threshold voltages through second to kth channels from the light emitting diodes by controlling a switching operation of the M multiplexers, sampling/holding the read threshold voltages, converting the sampled/held threshold voltages into digital signals, and storing the digital signals in the memory;
• reading threshold voltages of organic light emitting diodes arranged on a first horizontal line through the above steps, storing the read threshold voltages in the memory, and storing threshold voltages of all organic light emitting diodes arranged on a display panel in the memory by repeating the above steps for organic light emitting diodes arranged on subsequent horizontal lines;
• and
• compensating and outputting data signals based on the threshold voltages of the organic light emitting diodes, which are stored in the memory, when displaying an image by driving the display panel;
• wherein the data signals are outputted after being compensated based on an average value of threshold voltages detected in plural times, and
• wherein ‘M’ is greater than one and less than ‘N’.