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US 7,612,758 B2Granted
Brightness control method and device for a display
AssigneeSunplus Technology Co., Ltd.
InventorHo-Hsing Yang
Life of this patent
Estimating the term…
Abstract
A brightness control method and device for a display, which calculates a brightness distribution of partial frame image, determines when the partial frame image tends to be dark or light, compares a backlight brightness of the display with a predetermined value in accordance with the partial frame image determined, and accordingly adjusts the backlight brightness of the display.
Claims6
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.
1 more element
Dependencies are inferred from the claim text.