Patent ID: 8368417

Claim:
A method for detecting a bright dot or a dark dot in a LCD, comprising: step 1 of applying a first detection voltage to a color filter substrate common electrode on a color filter substrate and forming a first voltage difference between the color filter substrate common electrode and a pixel electrode on an array substrate; step 2 of determining whether a bright dot or a dark dot occurs in the LCD and carrying out step 3 if there exists a bright dot or a dark dot in the LCD or step 7 if there does not exist a bright dot or a dark dot in the LCD; step 3 of collecting a first luminance value of the bright dot or the dark dot; step 4 of switching the first detection voltage applied to the color filter substrate common electrode to a second detection voltage, and thus forming a second voltage difference between the color filter substrate common electrode and the pixel electrode on the array substrate; step 5 of collecting a second luminance value of the bright dot or the dark dot; step 6 of determining the difference between the first luminance value and the second luminance value, so that the bright dot or the dark dot is determined to result from a liquid crystal cell defect if |the first luminance value−the second luminance value|≦A, and is determined to result from an array substrate defect if |the first luminance value−the second luminance value|≧B, wherein A is a first pre-determined difference value, B is a second pre-determined difference value; and step 7 of ending the detection process.