Abstract: A luminance compensation device for a backlight module and a method thereof are provided herein. In the present invention, a light sensor unit is utilized to sense a light intensity of the backlight module. A difference parameter based on the sensed light intensity and a preset luminance is calculated. Then, a gamma curve, a video data, or light intensity of the backlight module is adjusted according to the difference parameter. As a result, the level of display quality affected by the temperature or the aging of the backlight module can be reduced.

Abstract: The invention provides a method and apparatus for controlling brightness of illumination systems, illumination systems and display using the same. The apparatus includes a photo-sensor and a control circuit. The photo-sensor detects a luminous output of the illumination systems and correspondingly outputs a detection signal. The control circuit gets the detection signal during the light source being turned off, and adjusts and controls the brightness according this feedback signal. The method and apparatus of the invention can offer a stable output to illumination systems and displays using the same.

Abstract: A luminance compensation device for a backlight module and a method thereof are provided herein. In the present invention, a light sensor unit is utilized to sense a light intensity of the backlight module. A difference parameter based on the sensed light intensity and a preset luminance is calculated. Then, a gamma curve, a video data, or light intensity of the backlight module is adjusted according to the difference parameter. As a result, the level of display quality affected by the temperature or the aging of the backlight module can be reduced.