Patent ID: 7990363
Filing Date: 2011-08-02
Classification: G09G

Abstract:
1. A common voltage adjusting method for a liquid crystal display (LCD), the LCD comprising a gate driving circuit, a data driving circuit, a plurality of gate lines parallel to each other, a plurality of data lines parallel to each other and orthogonal to the gate lines, and a plurality of pixel units each comprising a red sub-pixel, a blue sub-pixel, and a green sub-pixel defined by the gate lines and the data lines, the pixel units comprising a first pixel unit and a second pixel unit, the method comprising: providing a positive high level voltage to the red and the blue sub-pixels of the first pixel unit respectively and providing a negative high level voltage to the green sub-pixel of the first pixel unit via corresponding data lines when the corresponding gate lines are scanned by a number of scanning signals in a first frame; inspecting the first pixel unit by a first color sensor device, and generating a first color parameter in the first frame; providing a negative high level voltage to the red and the blue sub-pixels of the second pixel unit respectively and providing a positive high level voltage to the green sub-pixel of the second pixel unit via corresponding data lines when the corresponding gate lines are scanned by a number of scanning signals in a second frame; inspecting the second pixel unit by a second color sensor device, and generating a second color parameter in a second frame; generating a common voltage adjusting parameter according to a result of a comparison of the first color parameter with the second color parameter; adjusting a common voltage of the LCD according to the common voltage adjusting parameter, and confirming the adjusted common voltage is a preferred common voltage when a difference of the first color parameter and the second color parameter has a smallest value.