A driving control circuit of a backlight module

Abstract

The invention discloses a driving control circuit for a backlight module, which comprises a BOOST module, a signal input control module and a constant current control output module, wherein the input end of the BOOST module is connected with DC voltage, and used for boosting the inputted DC voltage and outputting boosted DC voltage; the signal input control module is connected with the inputted DC voltage, and the output end of the signal input control module is connected with the constant current control output module; and the constant current control output module is turned on to work when the signal input control module inputs high-level signals or suspension signals, and has no output when the signal input control module inputs low-level signals. According to the invention, high-level, suspension or low-level control can be satisfied through providing the driving control circuit for the backlight module. Compared with the prior art, the driving control circuit disclosed by the invention is small in number of components for realizing the three types of control functions, simple in circuit, complete in function, and good in effect through being actually used in batch.

Description

Technical field [0001] The invention relates to the field of display technology, in particular to a drive control circuit of a backlight module. Background technique [0002] In recent years, a considerable number of electronic products have gradually developed in a portable direction such as light weight, thin thickness, and short length in order to meet the requirements of the consumer market. An existing solution is to continuously compress the volume of electronic components, or continue to integrate and enhance the realization functions of integrated chips, to replace traditional large-volume electronic components or more complex IC application designs. [0003] The traditional LCD backlight module includes a backlight source and a backlight source control device. The backlight source control device is used to control the turning on and off of the backlight source. Currently, the backlight module lighting and detection methods mainly include the following two modes : One is t...

AI Technical Summary

Problems solved by technology

One of the existing solutions is to continuously compress the volume of electronic components, or to continuously integrate and enhance the implementation functions of integrated chips to replace traditional large-volume electronic components or more complex IC application designs.

[0003] The traditional liquid crystal display backlight module includes a backlight source and a backlight control device. The backlight control device is used to control the opening and closing of the backlight source. At present, the lighting and detection methods of the backlight module mainly include the following two modes: : One is to connect the positive pole of the backlight module with a voltage source higher than the backlight module, and the negative pole of the backlight module is connected to the constant current circuit. The voltage of the voltage source minus the voltage of the backlight module will be controlled by the MOS of the constant current circuit , triode or resistor, this circuit is simple but the voltage range for lighting the backlight module is relatively small, and the cost is relatively high; the second is to use BOOST self-boosting circuit, which automatically boosts the voltage after the circuit is powered on, to be added to the backlight module The voltage of the backlight is gradually increased to make the backlight module light up and the voltage condition of the constant current circuit is met, and then the feedback signal is sent to the boost chip to stop the boost. Not only need to provide a stable DC power supply, but also need to provide adjustable signal input control equipment or DC power supply equipment, resulting in increased production and operating costs, cumbersome procedures

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