LED (Light-emitting Diode) backlight driving and protection circuit, and display equipment

Abstract

The invention relates to the field of display equipment, and discloses an LED backlight driving and protection circuit, and a display equipment. The LED backlight driving and protection circuit is connected with at least one LED string light, and comprises a voltage conversion module, a driving module and a protection module. The voltage conversion module is used for rising an input power to satisfy the normal work of the LED string light; the driving module is used for driving the voltage conversion module to rise the voltage, and includes a driving chip; the protection module is used for preventing the driving chip from being damaged if the high voltage outputted by the voltage conversion module is directly filled into the driving chip when short circuit occurs at the negative and positive ends of the LED string light; at least one protection module is provided; and, each path of the LED string light is connected with one protection module in series. The LED backlight driving and protection circuit can effectively prevent the driving chip from being damaged when short circuit occurs; the element cost and the maintenance time are saved; the LED output voltage is also not limited by the withstand voltage of the internal elements of the driving chip.

Description

technical field [0001] The invention belongs to the field of display equipment, and in particular relates to an LED backlight driving protection circuit and a display equipment. Background technique [0002] The LED backlight circuit used in most of the display screens now, in order to make the LED life longer and the brightness uniform, usually uses multiple LEDs to work with separate constant currents, there are two, four, eight and so on. It is very important to choose the scheme of multi-channel separate constant current. At present, the commonly used scheme is to use the split LED to drive the internal constant current of the chip. Due to the consistency of the design of the driver chip, each channel can be well controlled. The current is within a certain range, which not only ensures the life of the LED but also ensures the uniformity of the brightness of the whole machine. However, with the development of the LED industry, the voltage of LEDs is now relatively high, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an LED backlight drive protection circuit and a display device to solve the problem that the traditional LED backlight circuit needs to use a drive chip with a high internal withstand voltage value, which makes the cost of the drive chip high

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