Patent ID: 8044921

Claim:
An apparatus for dynamically controlling backlight source, for receiving a pixel input data to output a pixel output data and a pulse width modulation (PWM) signal, the apparatus comprising: an image analysis unit, for receiving the pixel input data, and performing an image analysis to output an image data; an information unit, for storing a relation data including a luminance adjusting data and a PWM adjusting data corresponding to a gray level range, wherein the gray level range is just divided into two ranges of a low range and a high range; a luminance calculation unit, for receiving the image data from the image analysis unit and the relation data from the information unit, configured to calculate a required gray level corresponding to a required luminance, and respectively output a required pixel luminance data and a required PWM data according to the required gray level, wherein the required PWM data is constantly adjusted to a PWM minimum value and the required gray level is non-constantly adjusted when a gray level of the pixel input data is at the low range, wherein the required PWM data is non-constantly adjusted and the required gray level is constantly adjusted to a maximum value when the gray level of the pixel input data is at the high range; a PWM adjusting unit, for receiving the required PWM data to output the PWM signal; and a multiplication unit, for receiving the pixel input data and performing a luminance adjustment to the pixel input data according to the required pixel luminance data to output the pixel output data.