Patent ID: 8754841
Filing Date: 2014-06-17
Classification: G09G

Abstract:
1. A display driver comprising: a first backlight control unit including a circuit for switching brightness of a display image based on a display data value at a predetermined position of a histogram of inputted display data and a circuit for switching backlight luminance based on the display data value, an object of detection of the histogram being a data range from a brightest level to an N-th level of gray-scale (N is a positive integer and is not 0) of the display data; a second backlight control unit including a circuit for backlight luminance control different from the first backlight control unit; and a generating unit setting a backlight control signal value consisting of a product of a luminance rate of X % and a luminance rate of Y % as a luminance rate of a backlight control signal for controlling a backlight with respect to maximum backlight luminance where a luminance rate of the backlight control signal obtained by a processing of the first backlight control unit with respect to the maximum backlight luminance is defined as X % (0<X<100) and a luminance rate of the backlight control signal obtained by a processing of the second backlight control unit with respect to the maximum backlight luminance is defined as Y % (0<Y<100), wherein the circuit for backlight luminance control of the second backlight control unit senses external-light luminance with an optical sensor and adjusts the backlight luminance, and wherein the luminance rate of Y % is defined based on the external-light luminance.