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Control circuit of backlight module and control method thereof

A technology for controlling circuits and backlight modules, applied to instruments, static indicators, etc., can solve the problems of incorrect operation of brightness feedback control, affecting the sampling of brightness sensor, etc., to solve the wrong operation of brightness feedback control, the control method is simple and reliable, and the efficiency is high. Effect

Inactive Publication Date: 2011-09-21
中航华东光电有限公司
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  • Application Information

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Problems solved by technology

But when there is strong light, the external strong light will shine through the LCD screen to the brightness sensor on the backlight board, which will affect the sampling of the brightness sensor, thus causing the wrong operation of the brightness feedback control

Method used

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  • Control circuit of backlight module and control method thereof
  • Control circuit of backlight module and control method thereof
  • Control circuit of backlight module and control method thereof

Examples

Experimental program
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Embodiment Construction

[0016] see figure 1 It can be seen that the LED backlight circuit includes a controller 1, a sensor 2, a sampling circuit 3, an LED backlight 4 and a driving circuit 5, wherein the sensor 2 is connected to the input end of the controller 1 through the sampling circuit 3, and the LED backlight 4 is connected to the input terminal of the controller 1 through the driving circuit. 5. Connect to the output terminal of the controller 1, the sensor 2 is a brightness sensor, which is set on the backlight panel of the liquid crystal display module, and is set at the center of the lamp panel, to collect the brightness signal in the cavity of the liquid crystal display module, and the collected brightness signal The sampling circuit 3 is sent to the input terminal of the controller 1, and the controller 1 processes the data and outputs the PWM dimming signal from the output terminal, and the PWM dimming signal is amplified by the driving circuit 5 and then sent to the LED backlight 4 , s...

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Abstract

The invention discloses a control circuit of a backlight module and a control method thereof, the structure of the circuit is that a brightness sensor is arranged in a cavity of a liquid crystal display module, the sensor is used for collecting brightness signals and transmitting the brightness signals to a controller, after a system is electrified, the controller can output PWM (pulse width modulation) waves corresponding to the appointed dimming level for illuminating a backlight lamp, data of the sensor during a high duty ratio section and a low duty ratio section of the PWM waves is collected respectively, normalization treatment is performed on the collected data for eliminating differences in the sensors and sampling errors, the collected data during the high duty ratio section needs to deduct the data during the low duty ratio section, the data after amendment is compared with a set standard value for judging whether the two are the same or not, if the amended data is greater than the standard value, the brightness drive data of the backlight lamp is reduced, if the collected data is less than the standard value, the brightness drive data of the backlight lamp is increased. The circuit of the system is simple and reliable, the problem of misoperation of backlight brightness feedback control under strong light irradiation is solved, and the accuracy is high.

Description

technical field [0001] The invention relates to a method for controlling the brightness of a backlight source in a liquid crystal display system, and more specifically relates to a method for controlling brightness feedback of a backlight source. Background technique [0002] When the liquid crystal display screen is in use, a stable and reliable backlight source is required. The current backlight of the liquid crystal display module is mainly based on the LED light source, because the LED light source has the advantages of good color reproduction, power saving, long life, low pollution, and high reliability. Due to the influence of temperature, use time and other factors, the LED light source will have different degrees of brightness attenuation, and its brightness will also vary due to different driving currents. After a long time of use, the brightness will decrease. In order to maintain the stability of the brightness The backlight control of the liquid crystal display m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36
Inventor 李培华向艳刘波
Owner 中航华东光电有限公司
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