Patent ID: 8850714
Filing Date: 2014-10-07
Classification: G09G,H04N

Abstract:
1. A chromaticity correction device that corrects chromaticity of a video signal displayed on a display panel of a display device to correspond to a change in a luminance value of the display panel, the chromaticity correction device comprising: a luminance detection unit configured to detect the luminance value; a backlight driving level detection unit configured to detect a backlight driving level which is controlling the luminance value; a temperature detection unit configured to detect an internal device temperature or an ambient temperature corresponding to a temperature of the backlight; a reference luminance value calculation unit configured to estimate a reference luminance value in a characteristic of an initial state in the backlight driving level and the temperature; a chromaticity calculation unit configured to obtain a chromaticity change amount of white point chromaticity from the reference luminance value and the luminance value detected by the luminance detection unit and estimated white point chromaticity that is an estimated value of current white point chromaticity from the chromaticity change amount and initial white point chromaticity which is white point chromaticity in the initial state measured in advance; a chromaticity correction value calculation unit configured to obtain a chromaticity correction value from the estimated white point chromaticity and target white point chromaticity set in advance; and a chromaticity correction circuit configured to correct the chromaticity of the video signal using the chromaticity correction value.