Patent ID: 8638323
Filing Date: 2014-01-28
Classification: G09G

Abstract:
1. A gamma correction system comprising: a brightness detection unit for alternately and repetitively detecting brightness information from at least two images displayed with a low gray scale level and a middle gray scale level on a display panel of an image display device in response to a gamma correction control signal programmed by a user; and a gamma correction device for averaging brightness information detected alternately and repetitively in response to the gamma correction control signal respectively, and selecting gamma correction information according to a ratio of the averages using a memory for correcting a gamma voltage of the image display device, wherein the brightness detection unit for detecting brightness information from at least two images displayed with the low gray scale level and the middle gray scale level alternately and repetitively includes a single optical instrument having single photo-sensor, wherein the gamma correction device includes a memory unit for storing a plurality of pieces of gamma correction information and forwarding the gamma correction information relevant to a selection control signal upon reception of the selection control signal; a data processing unit for receiving the brightness information on images for each of the low gray scale level and the middle gray scale level from the brightness detection unit in succession and calculating averages of the pieces of brightness information for each of the low gray scale level and the middle gray scale level and ratios thereof; a gamma correction control unit connected to an output of the data processing unit for generating the selection control signal relevant to the ratio information and forwarding the selection control signal to the memory unit, generating and forwarding a gamma correction enable signal in response to the selection control signal; and a gamma correction unit for receiving the gamma correction information from the memory unit upon reception of the gamma correction enable signal from the gamma correction control unit, and correcting the gamma voltage of the image display device by using the gamma correction information, wherein the brightness information detected is compared to pieces of preset reference brightness information to determine a result of examination, if there is no problem in the result of examination, the display panel is determined acceptable, if the brightness information detected fails to satisfy the reference brightness information two or more times, no gamma correction step is performed, and the display panel is determined defective right away, wherein the data processing unit discards the brightness information detected at first and the brightness information detected at last and combines, and calculates averages of, the pieces of the brightness information detected at between the first and the last times, wherein averages of the brightness information detected at between the first and the last times are calculated thus respectively, the data processing unit calculates the ratio information a ratio of a brightness average of an image of the low gray scale level to the brightness averages of images of the middle gray scale level.