An LED of each of colors, red, green and blue, undergoes PWM control independently in a unit emission period to emit light, luminance/chromaticity meter 31 measures the chromaticity of the light, a difference is calculated between the measured value and target white balance value, a duty ratio is corrected...http://www.google.de/patents/US20060152468?utm_source=gb-gplus-sharePatent US20060152468 - Display device adjusting method and display device
