A backlight source driving circuit, liquid crystal display device and driving method
A driving circuit and backlight technology, applied to light sources, electric light sources, lighting devices, etc., can solve problems such as low response rate, unstable power system, INRUSH noise, etc., achieve fast response rate, and improve animation display capabilities
Active Publication Date: 2016-02-03
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 with 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 driving circuit, a liquid crystal display device and a driving method. The backlight source driving circuit includes an error amplifying unit and a driving control unit. The error amplifying unit is configured to receive the feedback voltage from the backlight source for comparing the feedback voltage and the reference voltage, and adjusting the amplification factor for amplifying the comparison result according to the size of the comparison result. and the amplification speed, and output the amplification result as a control signal; the drive control unit is configured to receive a control signal from the error amplification unit, and is used to output a pulse width modulation dimming signal with a corresponding duty cycle according to the control signal, so as to modulate the power output to the backlight source voltage signal. The backlight source driving circuit of the present invention can be used for the driving operations of the backlight sources of various display devices, and can automatically adjust the response rate under different load modes. Compared with the prior art, the backlight source driving circuit has a faster response rate, thereby indirectly improving the display. The animation display capability of the device.
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, TFTLCD 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 dimmi...
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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