Patent ID: 8368629
Filing Date: 2013-02-05
Classification: G09G

Abstract:
1. A liquid crystal display, comprising: a liquid crystal display panel to which m/2 shared data lines and first and second gate lines are assigned in order to drive m liquid crystal cells arranged in the same horizontal line, pairs of adjacent liquid crystal cells being symmetrically connected to the first and second gate lines with a shared data line interposed therebetween; a gate driving circuit configured to sequentially supply scan pulses to the first and second gate lines; a charge difference compensation circuit configured to generate, in a specific gray level range, analog positive gamma voltages having a first reference level and analog negative gamma voltages having a second reference level in synchronization with a first scan time at which the first gate line is driven, and generate the analog positive gamma voltages having a first compensation level that is lower than the first reference level and the analog negative gamma voltages having a second compensation level that is higher than the second reference level in synchronization with a second scan time at which the second gate line is driven; and a data driving circuit configured to convert received digital video data into the analog positive gamma voltages or the analog negative gamma voltages in response to a polarity control signal which is inverted every 2 horizontal periods, and supply converted data to the data lines, wherein the specific gray level belongs to a gray level range having a gray level value of 25% to 75% of a peak white gray level, wherein the charge difference compensation circuit comprises a control signal generator configured to generate a compensation control signal for controlling an output timing of the gamma voltages in response to a source output enable signal necessary to drive the data driving circuit; and a gamma voltage controller configured to select output gamma voltages having the reference levels or the compensation levels in response to the compensation control signal, wherein the gamma voltage controller comprises a gamma resistor string unit comprising a plurality of voltage-dividing resistors and a plurality of voltage-dividing nodes, wherein the plurality of voltage-dividing resistors is coupled in series between a high-power source voltage and a low-power source voltage, and each of a plurality of voltage-dividing nodes is formed between the resistors and configured to output respective gamma voltages having a corresponding level; and a switching unit comprising a plurality of switches, wherein each of the switches only coupled to a voltage-dividing node corresponding to a specific gray level is selectively coupled to a first terminal configured to output the gamma voltages having the reference level, or a second terminal configured to output the gamma voltages having the compensation level, according to a logic level of a compensation control signal.