Liquid crystal display device and method for driving same

摘要

Provided is a liquid crystal display device capable of reliably reducing power consumption during pause drive by controlling the timing of performing refresh.;When there is an image change in externally inputted RGB data, or when the number of consecutive pause frames reaches a predetermined value, if the number of immediately preceding pause frames is less than a threshold BCTH, image signal refresh is performed once, or if the number of pause frames is greater than or equal to the threshold BCTH, boost charge refresh is performed first, and then, the image signal refresh is performed. As a result, it is rendered possible to reduce flicker due to luminance reduction, and it is also rendered possible to eliminate the need to perform refresh consecutively even if the frequency of RGB data is high (e.g., 30 Hz) during pause drive.

主权项

1. A liquid crystal display device performing pause drive with a pause frame for pausing screen refresh being set between two refresh frames in which screen refresh is performed, the device comprising:
a display portion including a plurality of scanning signal lines formed on an insulating substrate, a plurality of data signal lines crossing each of the scanning signal lines, and a plurality of pixel forming portions arranged in a matrix corresponding to respective intersections of the scanning signal lines and the data signal lines; a scanning signal line driver circuit configured sequentially to select the scanning signal lines; a data signal line driver circuit configured to write image signal voltages to the data signal lines, the image signal voltages being generated on the basis of externally inputted image data; and a display control circuit configured to control the operation of the scanning signal line driver circuit and the data signal line driver circuit, wherein, the display control circuit includes: a correction circuit configured either to output correction image data obtained by subjecting image data for a current frame to a tone emphasizing process for emphasizing a temporal change or to output the image data for the current frame without performing the tone emphasizing process; and a first register configured to store a preset threshold, the display control circuit determines whether the number of pause frames preceding the current frame is greater than the threshold, and when the number of pause frames is determined to be greater than the threshold, the data signal line driver circuit applies a boost charge voltage and an image signal voltage successively to the data signal lines, the boost charge voltage being different in polarity from image data for the pause frame and being based on the correction image data outputted by the correction circuit, the image signal voltage having the same polarity as the correction image data and being based on the image data for the current frame, whereas when the number of pause frames is determined to be less than the threshold, the data signal line driver circuit applies the image signal voltage to the data signal lines, the image signal voltage being different in polarity from the image data for the pause frame.