Patent ID: 6795046
Filing Date: 2004-09-21
Classification: G09G

Abstract:
A liquid crystal display (LCD) device, comprising:a plurality of pixels arranged in a matrix of rows and columns, each pixel including, a pixel switching device having first and second terminals and a control terminal, and a storage device connected to the first terminal of the pixel switching device; a plurality of column lines connected to the second terminals of the pixel switching devices; a plurality of column drivers connected to and providing data voltages to the column lines; a plurality of scanning lines connected to the control terminals of the pixel switching devices for selectively connecting the first and second terminals of the pixel switching devices; at least a first column switch having first and second terminals, the first terminal connected to a selected one of the column lines, and responsive to a corresponding control signal, selectively supplying the data voltage on the selected column line to the second terminal of the first column switch; a first comparator having two inputs receiving the reference voltage and the data voltage on the selected column line, and an output producing a first calibration data error value representing a difference between the reference voltage and the data voltage on the selected column line; and a commutation switch having two input terminals, two output terminals and a control terminal, the two input terminals receiving, respectively, the data voltage on the selected column line from the first column switch and the reference voltage, the two output terminals providing to the two inputs of the first comparator the reference voltage and the data voltage on the selected column line from the first column switch, and the control terminal controlling which of the two input terminals is connected to which of the two output terminals.