Redundant backup circuit for LED backlight and control method thereof

Abstract

The invention discloses an LED backlight redundant backup circuit and a control method of the LED backlight redundant backup circuit. An FPGA controller is connected with a first path linear constant current source and a second path linear constant current source, the first path linear constant current source is connected with a first path LED lamp array and a first path backlight working state feedback circuit, the second path linear constant current source is connected with a second path LED lamp array and a second path backlight working state feedback circuit, the FPGA controller is connected with the first path backlight working state feedback circuit and the second path backlight working state feedback circuit, and the FPGA controller is further connected with an upper computer through serial communication. The invention further discloses the corresponding control method. The two paths of backlight circuits alternatively work, and only one path backlight circuit works at one time; the backlight working state feedback circuits detect the working state, and therefore the backlight redundant backup function is achieved; feedback is increased, so that controllability of the redundant circuit is improved, and the redundant circuit is simple and reliable.

Description

technical field [0001] The invention relates to a liquid crystal display, in particular to an LED backlight redundant backup circuit and a control method thereof. Background technique [0002] With the maturity of LED technology, various LED backlight drivers have been developed one after another, and the cost has also dropped significantly. At present, in the field of LED driving, there are many ways to drive LEDs, such as step-up, step-down, and integrated chips. Chinese patent: CN102364569A, a linear constant current drive control circuit and its LED display, the self-made linear constant current source circuit makes the LED light string always work in a constant current state, thereby maintaining the brightness consistency of the LED light. [0003] LED backlight has many advantages such as high brightness, high color purity, long life, strong adaptability, low cost, and easy industrialization. On this basis, the aviation field has put forward higher requirements for L...

AI Technical Summary

Problems solved by technology

[0004] At present, PWM dimming is often used for dimming LED light sources to achieve the purpose of linear control. There is only one main component of the driving circuit and control circuit. When the components are damaged, the backlight cannot be used normally. For LEDs used in the aviation field backlight drive circuit, such reliability is not enough

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