Importance

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Abstract

Methods and apparatuses for backlight calibration are described. The apparatus 100 comprises a backlight unit 102 comprising a plurality of light sources 120, at least one photo-sensor 103 adapted to measure the light emitted by the backlight unit 102, a photo-sensor controller 112 coupled to the photo-sensor 103 for controlling the photo-sensor(s) 103, a backlight driving circuit 104 coupled to the light sources 120 for providing individual driving on each light source, a signal generator 114 coupled to the photo-sensor controller 112 and the backlight driving circuit 104 for controlling the operation timing of photo-sensors 103 and each of the light source 120 such that lighting conditions from each of the light source can be acquired, and a processing unit 111 coupled to the photo-sensor 103 and the backlight driving circuit 104 for analyzing the measurement data from the photo-sensors 103 and providing an adjustment signal to the backlight driving circuit 104 to achieve uniform lighting conditions of the backlight unit 102. Also described is a method comprising the steps of providing saved settings for backlight driver, providing a modified timing sequence to backlight driver and photo sensor 202, measuring light conditions of each individual light source or each individual group of light sources in backlight unit 203, comparing measurement data with predefined light conditions 205, calculating the adjustment required on backlight drivel to achieve desired light conditions, and saving calculated adjustment as new settings for backlight driver 207.

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First Claim