Patent ID: 8674976
Filing Date: 2014-03-18
Classification: G09G

Abstract:
1. A liquid crystal display comprising: a liquid crystal display panel including a plurality of data lines, a plurality of gate lines crossing the plurality of data lines, and a plurality of liquid crystal cells arranged at crossings of the data lines and the gate lines in a matrix form; a data driving circuit configured to supply a data voltage to the data lines; and a power consumption reduction circuit configured to calculate the number of black pixels, white pixels, or both included in an input image, decide whether or not the input image is a problem pattern increasing power consumption of the data driving circuit based on the calculation result, selectively activate a charge sharing function, which shorts between adjacent output channels of the data driving circuit during a predetermined period, and differently control a polarity inversion period of the data voltage based on the decision result, wherein when the input image is the problem pattern, the power consumption reduction circuit increases a logic level inversion period of a polarity control signal from k horizontal period (where k is a positive integer), that has been previously set to a default value, to one frame period, and at the same time, inverts a charge share control signal from a high logic level, that has been previously set to a default value, to a low logic level, in order to inactivate the charge sharing function, wherein when the input image is a normal pattern other than the problem pattern, the power consumption reduction circuit holds the logic level inversion period of the polarity control signal in the k horizontal period, and at the same time, holds the logic level of the charge share control signal at the high logic level, in order to activate the charge sharing function.