Patent ID: 8519942

Claim:
A display device, comprising: a display module displaying an image; a backlight module providing backlight for the display module; a memory storing a relationship between an image brightness and a backlight adjusting coefficient; a brightness computing module computing a current display image brightness; a retrieving module retrieving a backlight adjusting coefficient corresponding to the current display image from the memory according to the current display image brightness computed by the brightness computing module; and a backlight adjusting module adjusting the backlight brightness provided by the backlight module according to the backlight adjusting coefficient retrieved by the retrieving module; wherein the backlight adjusting module comprises a computing unit, a comparing unit, and an adjusting unit; the computing unit is used for computing a first average of the backlight adjusting coefficients corresponding to a first predetermined number of images displayed before the current display image; the comparing unit is used for comparing the backlight adjusting coefficient corresponding to the current display image and the first average; if the backlight adjusting coefficient corresponding to the current display image is smaller than the first average, and the difference between the backlight adjusting coefficient corresponding to the current display image and the first average is larger than a first predetermined value, the comparing unit generates a first signal; the computing unit is further used for computing a second average of the backlight adjusting coefficients corresponding to a second predetermined number of images displayed before the current display image in response to the first signal, the comparing unit is further used for determining whether the difference between the backlight adjusting coefficient corresponding to the current display image and the second average is larger than a second predetermined value, and if the difference between the backlight adjusting coefficient corresponding to the current display image and the second average is larger than the second predetermined value, the adjusting unit uses a current backlight adjusting coefficient to adjust the backlight brightness provided by the backlight module.