Patent ID: 6791520
Filing Date: 2004-09-14
Classification: G09G

Abstract:
A method for measuring an image-sticking defect in a liquid crystal display device, comprising:irradiating light from a backlight to the liquid crystal display device; displaying a first full white state on a liquid crystal display screen of the liquid crystal display device to which the light is irradiated; measuring first luminance values of a plurality of designated points on the liquid crystal display screen; calculating an average luminance value of the first full white state using the first luminance values; displaying a full black state on the liquid crystal display screen; measuring second luminance values of the plurality of designated points on the liquid crystal display screen; calculating an average luminance value of the fall black state using the second luminance values; forming a gray scale using the average luminance value of the first full white state and the average luminance value of the full black state; displaying a second full white state on the liquid crystal display screen; and measuring a luminance change of the second full white state with time at the plurality of designated points using the gray scale.