Patent ID: 8553051
Filing Date: 2013-10-08
Classification: G09G

Abstract:
1. A liquid crystal display (LCD), comprising: a first data line; a second data line; a first scan line; a second scan line; a third scan line, wherein the first scan line is located between the second scan line and the third scan line; a common electrode; an LCD panel, which comprises: a first pixel electrically connected to the first scan line and the first data line; a second pixel electrically connected to the second scan line and the first data line; a third pixel electrically connected to the first scan line and the second data line; and a fourth pixel electrically connected to the second scan line and the second data line; a scan driver for controlling the first to fourth pixels; a timing controller for receiving first original pixel data, second original pixel data, third original pixel data and fourth original pixel data, which are respectively target gray levels to be displayed by the first to fourth pixels, wherein the first and second original pixel data are different from each other, the third and fourth original pixel data are substantially the same; and the timing controller is further for outputting first adjusted pixel data, second adjusted pixel data, third adjusted pixel data and fourth adjusted pixel data according to the first original pixel data, the second original pixel data, the third original pixel data and the fourth original pixel data, wherein the first and second adjusted pixel data are different from each other, and the third and fourth adjusted pixel data are different from each other to compensate for a common voltage offset on the common electrode; and a data driver for receiving the first to fourth adjusted pixel data and thus respectively outputting a first adjusted pixel voltage, a second adjusted pixel voltage, a third adjusted pixel voltage and a fourth adjusted pixel voltage to the first to fourth pixels, wherein, the first original pixel data and the first adjusted pixel data respectively correspond to a first original pixel voltage and the first adjusted pixel voltage; the timing controller for determining a correction voltage index according to an absolute difference between an average of original pixel voltages corresponding to original pixel data of all pixels on the first scan line and an average of original pixel voltages corresponding to original pixel data of all pixels on the third scan line, obtaining a correction voltage, by means of table looking, according to the correction voltage index, determining the first adjusted pixel voltage according to the first original pixel voltage and the correction voltage, and outputting the first adjusted pixel data corresponding to the first adjusted pixel voltage; and the absolute difference between the average of original pixel voltages corresponding to original pixel data of all pixels in the first scan line and the average of original pixel voltages corresponding to original pixel data of all pixels on the third scan line relates to the common voltage offset on the common electrode; wherein the timing controller looks up a reference table to obtain the correction voltage according to the correction voltage index; the timing controller selects one of a plurality of reference tables as the reference table according to a row number of the LCD panel where the target pixel is located; when the first pixel is located in the ith row of the LCD panel, the timing controller is to select a first reference table as the reference table; when the first pixel is located in a jth row of the LCD panel, the timing controller is to select a second reference table as the reference table; the correction voltage corresponding to the correction voltage index in the first reference table is smaller than the correction voltage corresponding to the same correction voltage index in the second reference table; and “i” and “j” are positive integers, and “i” is smaller than “j”, the jth row is located in a lower section of the LCD panel than the ith row.