Backlight driving system for regional dimming and regional dimming method
A technology of regional dimming and backlight driving, applied in the field of display, can solve the problems of whitening of dark images and affecting the contrast of images, and achieve the effect of reducing energy consumption, improving display effect and improving visual experience.
Active Publication Date: 2015-02-04
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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[0006] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a backlight drive system and a regional dimming method for regional dimming, so as to solve the problem of turning off the liquid crystal only according to the dark field signal in the existing dimming technology. Molecules, while the backlight is still working normally, resulting in whitening of the dark scene image, which affects the contrast of the image
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[0035] The present invention provides a backlight driving system and a method for regional dimming, which solve the problem that the current liquid crystal display device has a large backlight power, no energy saving, and poor image contrast, that is, the corresponding dark field signal appears in the image. The backlight cannot be turned off, so that only the liquid crystal molecules in the LCD screen are turned off during the dark field, resulting in the dark field and layering can not be well displayed.
[0036] The present invention dynamically adjusts the brightness of the backlight in the corresponding area according to the brightness content of the screen. Compared with traditional display devices, it can save more than 20% of energy consumption. In terms of image display effect, it can reflect brighter bright fields, darker dark fields, The image layering is obvious, and the image quality, contrast and other display effects are significantly improved. At the same time, ...
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The invention discloses a backlight driving system for regional dimming and a regional dimming method. The backlight driving system for regional dimming comprises an MCU (Microprogrammed Control Unit) control module, at least one constant-current driving module and at least one DC-CD (Direct Current- Direct Current) module. The MCU control module processes dimming control signals sent by a master control chip and then sends the processed dimming control signals to the at least one constant-current driving module, and the at least one constant-current driving module divides backlight LEDs into a plurality of areas and controls on and off of LEDs in the corresponding areas according to the dimming control signals processed by the MCU control module. Therefore the backlight brightness of the corresponding areas can be dynamically adjusted according to the brightness content of display pictures, the bright fields of the display pictures are brighter, the dark fields of the display pictures are darker, the sense of picture depth is obvious, the display effect such as the picture quality and the contrast ratio are obviously improved, the visual perception is also improved, and energy consumption of display equipment is reduced as backlight sources of the dark filed areas are closed.
Description
technical field [0001] The invention relates to the field of display technology, in particular to a backlight driving system and a method for regional dimming. Background technique [0002] Liquid crystal display devices (such as LCD TVs, LCD computer monitors, etc.), as new products that have only emerged in recent years, have completely replaced bulky CRT (Cathode Ray Tube, cathode ray tube) displays and become mainstream display devices. [0003] Because the liquid crystal itself does not emit light, the LCD (Liquid Crystal Display, liquid crystal display) panel is a passive illuminant, which relies on the backlight to emit light. Due to the small size of the LED (light emitting diode, light emitting diode) backlight, it emits light. It has high efficiency and flexible combination, so it has been widely used in LCD flat-panel TVs. [0004] At present, there are generally two ways to set up the backlight source of liquid crystal display equipment: one way is the side-in t...
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IPC IPC(8): G09G3/34H05B37/02
Inventor 巢铁牛付华东孙细勇姚志忠
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD