LED (Light Emitting Diode) backlight driving device

Abstract

The invention provides an LED (Light Emitting Diode) backlight driving device used for driving multiple paths of LED light strings. The LED backlight driving device comprises a power supply circuit and a control circuit. The power supply circuit comprises a first power supply output module and a second power supply output module with adjustable voltage, wherein the first power supply output module is used for outputting a first power supply voltage; and the second power supply output module is used for outputting a second power supply voltage to an LED light string. The control circuit comprises a communication control module and multiple constant current control modules. The communication control module is supplied with power by the first power supply voltage and generates a control signal of the first type and multiple control signals of the second type. Each constant current control module is electrically connected with the communication control module and a corresponding LED light string respectively, wherein the communication control module controls the second power supply voltage output by the second power supply output module by using the first type of control signal and respectively controls the constant current control module by using the second type of control signals so that the currents in these LED light strings are controlled in a constant state and controlled to scan these LED light strings row by row.

Description

technical field

[0001] The invention relates to the field of display technology, in particular to an LED backlight driving device for a liquid crystal display device. Background technique

[0002] Flat panel display devices, such as liquid crystal display devices (liquid crystal display, LCD) have many advantages such as thinness, energy saving, and no radiation, so it has gradually replaced the traditional cathode ray tube (cathode ray tube, CRT) display device and has become the preferred mainstream. Currently, liquid crystal display devices have been widely used in various electronic devices such as digital televisions, computers, personal digital assistants, mobile phones, and digital cameras.

[0003] Most of the existing liquid crystal display devices use light-emitting diodes (light-emitting diodes, LEDs) as backlight sources to provide light sources for the liquid crystal display devices. At present, LED backlights in liquid crystal display devices with 3D display ...

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