Patent ID: 7612758
Filing Date: 2009-11-03
Classification: G09G

Abstract:
1. A brightness control device for a display, comprising: a video stream histogram unit, which receives a partial frame image and calculates a brightness distribution of the partial frame image; a dynamic range calculation module, which determines a brightness of the partial frame image in accordance with the brightness distribution, and determines if a backlight brightness of the display meets with the brightness of the partial frame image in order to generate a control signal, wherein the backlight brightness is reduced when the brightness distribution of the partial frame image tends to be dark and the backlight brightness is greater than a third predetermined value, or the backlight brightness is increased when the brightness distribution of the partial frame image tends to be light and the backlight brightness is smaller than a fourth predetermined value; and a backlight pulse width modulation (PWM) controller, which adjusts the backlight brightness of the display in accordance with the control signal.