Backlight source drive circuit, liquid crystal display device and drive method
A driving circuit and backlight technology, applied in the direction of light source, electric light source, lighting device, etc., can solve the problems of unstable power system, low response rate, INRUSH noise, etc., and achieve the effect of improving animation display ability and fast response rate
Active Publication Date: 2014-03-26
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
Although this one-size-fits-all design method is simple and convenient, because it ignores the middle mode with the most frequent brightness changes in actual use, the overall response rate is low, which will cause INRUSH noise and power system instability.
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[0020] In order to make the backlight driving circuit have different response rates under different load modes, the present invention improves the backlight driving circuit in the existing liquid crystal display device, and changes the error amplification unit in the original driving circuit into a An error amplification unit that automatically adjusts the amplification capability. Specifically, the backlight driving circuit provided by the present invention includes:
[0021] The error amplification unit is configured to receive the feedback voltage from the backlight, and is used to compare the feedback voltage and the reference voltage, adjust the amplification factor and the amplification speed of the comparison result according to the magnitude of the comparison result, and output the amplification result as a control signal;
[0022] The drive control unit is configured to receive a control signal from the error amplifier unit, and is used to output a PWM dimming signal ...
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The invention discloses a backlight source drive circuit, a liquid crystal display device and a drive method. The backlight source drive circuit comprises an error amplifying unit and a drive control unit. The error amplifying unit is configured to receive feedback voltage from a backlight source and is used for comparing the feedback voltage and reference voltage, adjusting and amplifying the amplifying coefficients and the amplifying speed of the comparison result according to the comparison result, and outputting the amplifying result as a control sign. The drive control unit is configured to receive the control signal from the error amplifying unit and is used for outputting a pulse width modulating dimming signal with corresponding duty ratio according to the control signal so as to modulating a voltage signal output by a power supply to the backlight source. The backlight source drive circuit can be used for driving operation of backlight sources of various display devices, can automatically adjust the responding speed in different loading modes, and is faster in response speed compared with the prior art, so that the animation display ability of display devices can be improved indirectly.
Description
technical field [0001] The invention relates to a backlight source driving technology of a display device, in particular to a backlight source drive circuit, a liquid crystal display device and a driving method. Background technique [0002] In today's image display technology field, TFT LCD liquid crystal display devices stand out for their excellent performance, and are rapidly expanding in various application fields such as mobile phones, computers, and televisions. Since the liquid crystal display device uses the deflection of the non-luminous liquid crystal under the action of voltage to control the transmittance of the backlight source and realize the display function of the image, improving the working performance of the backlight module is also an important research and development direction of the display technology. At present, mainstream liquid crystal display device manufacturers use such as figure 1 The boost converter shown with pulse width modulation and dimm...
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IPC IPC(8): G09G3/34G09G3/36H05B44/00
CPCG09G3/3406G09G2320/0252G09G2320/064H05B45/10H05B45/20
Inventor 杨翔
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD