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Control method for field-sequential colorful LED back light source technology

A technology of LED light source and control method, applied in energy-saving control technology, light source, electric light source, etc., can solve the problems of insufficient contrast stretching, only color gamut performance, short service life, etc. consumption effect

Inactive Publication Date: 2009-02-18
FUDAN UNIV
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Problems solved by technology

Although the current cold cathode fluorescent tube technology is very mature, its service life is short, its volume is large, its contrast ratio is not stretched enough, its power consumption is large, and its color gamut performance is only 65% ​​to 78% of that of the National Television Standards Committee (NTSC). Expressiveness cannot meet the growing demand for video

Method used

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  • Control method for field-sequential colorful LED back light source technology
  • Control method for field-sequential colorful LED back light source technology
  • Control method for field-sequential colorful LED back light source technology

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Embodiment Construction

[0024] like figure 1 As shown, according to the present invention, the backlight control system constructed by adopting the color LED light source as the control method of the liquid crystal display backlight is composed of a backlight drive control module 5, an image data acquisition module 6, and an FPGA timing control module 7. The source and gate of the thin film transistors of the liquid crystal panel 1 are respectively controlled by a source drive control module 3 and a gate drive control module 4 . The image data acquisition module 6 transmits the original image data to the source drive control module 3 , the gate drive control module 4 and the backlight drive control module 5 respectively. The source driver 3 and the gate driver control module 4 control the thin film transistors of the liquid crystal panel to pass or block the light of the backlight 2 . After the backlight drive control module 5 receives the image data, it cooperates with the timing output by the FPGA...

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Abstract

The invention provides a control method for using color LED light source as backlight source of the LCD, which comprises adopting color LED as the backlight source, time-sharing lightening LED by field sequential system principle, synthesizing color iamge by human-eye visual persistence effect; inserting full-black frame in time-sharing lightening time sequence for reducing round-off phenomenon when displaying dynamic image; mixing lightening backlight source LED of positive sequence and negative sequence for reducing degree of color breakup phenomenon; in addition, the invention provides a method for controlling the dynamic area for further improving contrast. Adopting the control method of the invention can further improve working performance and structure size of the LCD, prolong the service life and increase the color expressive force of the LCD.

Description

technical field [0001] The invention belongs to the technical field of computer multimedia, and in particular relates to a control method based on a field sequential color LED backlight source. Background technique [0002] Since the liquid crystal itself cannot emit light, the formation of the liquid crystal image must rely on an external light source—commonly known as the backlight component, which controls the liquid crystal to "block" and "transmit" the backlight through the thin-film transistor (TFT) on the panel to emit light. To achieve color image restoration. The function of the backlight assembly is mainly to provide a uniform background light source. A traditional thin film transistor liquid crystal display (thin film transistor crystal display, TFT-LCD) usually uses cold cathode fluorescent lamps (cold cathode fluorescent lamps, CCFL) as a backlight source. Although the current cold cathode fluorescent tube technology is very mature, its service life is short, ...

Claims

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Application Information

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IPC IPC(8): G09G3/36G02F1/133G02F1/1362H05B37/02
CPCY02B20/42Y02B20/40
Inventor 陆起涌陈熙孙研王力超
Owner FUDAN UNIV
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