Patent ID: 8436802
Filing Date: 2013-05-07
Classification: G09G

Abstract:
1. A liquid crystal display device comprising: a liquid crystal display panel having a plurality of pixels wherein a data voltage signal is applied to the pixels, and each of a plurality of gate lines being sequentially selected by applying a gate pulse within a period, wherein the period comprises both a first duration and a second duration, wherein throughout the first duration, a selected gate line is scanned and the gate pulse is applied, and throughout the second duration, the selected gate line is not scanned and no gate pulse is applied; a plurality of light sources operable to be sequentially turned on according to the first and the second duration along a scan direction of the plurality of the gate lines, the plurality of light sources are turned on with a first level of brightness in response to a scanning control signal during a white turn-on period, wherein the white turn-on period corresponds to the first duration of the period, and the plurality of light sources are turned on with a second level of brightness throughout a gray turn-on period, wherein the gray turn-on period corresponds to the second duration of the period, and wherein the second level of brightness is lower than the first level of brightness and higher than or equal to 10% of a maximum brightness; and a controller operable to drive a plurality of inverters with pulse width modulation, wherein the controller synchronizes the scan direction of the plurality of gate lines with a turn-on scan direction of the plurality of light sources, wherein the controller supplies the scanning control signal and a brightness control signal to the plurality of inverters, wherein a pixel holds a data voltage charged therein during the white turn-on period and the pixel discharges the data voltage during the gray turn-on period, and wherein the plurality of inverters sequentially turns on the plurality of light sources along the scan direction of the plurality of gate lines in response to the scanning control signal, the light sources being turned on to the first level of brightness during the white turn-on period and lowered to the second level of brightness throughout the gray turn-on period in response to the brightness control signal.