Patent ID: 7471272

Claim:
A display device comprising: a liquid crystal display shaving pixels which are arranged in columns and rows; a gate driving arrangement for activating the pixels of rows in dependence on a row scanning scheme; a source driving arrangement for providing column voltages representing image data, the source driving arrangement has a memory unit for storing the image data; a number of buffers depending on the number of grey levels for supplying the respective voltage levels to the columns; a switching unit for selecting a voltage level which corresponds to the grey level to be displayed; and a control unit connected to the buffers to control the buffers, wherein each buffer is also connected to the control unit via a feedback line to send a feedback signal from the buffer to the control unit, indicating whether that buffer has delivered a drive signal to drive a certain grey level, and wherein the control unit is configured to analyze feedback signals from the buffers during a scan of the rows, said control unit being further configured to switch off each of the buffers that has not delivered a drive signal.