Patent ID: 8441470

Claim:
A color sensor unit for use in a display device for calibrating a luminance or a chromaticity of the display device using a contact-type optical sensor, the calibrating based on gradation correction information previously obtained using a telescopic-type optical sensor, the color sensor unit comprising: a) a contact-type optical sensor section disposed in proximity to a display surface of the display device, and having a first predetermined light receiving angle; b) the telescopic-type optical sensor having a second predetermined light receiving angle smaller than the first predetermined light receiving angle of the contact-type optical sensor; c) a gradation correction generation section, comprising: c1) an input section electrically connected with an output section of the display device, and configured to receive drive signals from the display device, the received drive signals corresponding to a plurality of gradation levels output by the display, independent of a backlighting level of the display device; c2) the input section configured to acquire, using the telescopic-type optical sensor, luminance and chromaticity values acquired at the plurality of different gradation drive levels; c3) a calibration section configured to obtain luminance or chromaticity values from the display device using the contact-type optical sensor based on the plurality of different drive levels provided by the display device, and configured to generate a plurality of gradation correction coefficients based on the luminance or chromaticity values obtained by the telescopic-type optical sensor and the contact-type optical sensor; d) a storage section configured to store the generated plurality of gradation correction coefficients corresponding to the plurality of different drive levels provided by the display device; e) a correcting section configured to correct the luminance value or the chromaticity value obtained by the contact-based optical sensor by applying the gradation correction coefficients to the luminance value or chromaticity value; and wherein the corrected luminance or chromaticity values obtained by the contact-type optical sensor are substantially equivalent to empirical luminance or chromaticity values that would be obtained by a telescopic-type optical sensor.