Backlight drive circuit and method for shortening soft starting time of backlight drive circuit

Abstract

The invention provides a backlight drive circuit and a method for shortening soft starting time of the backlight drive circuit. The backlight drive circuit comprises a constant-current driver chip (22) a first circuit portion (24) and a second circuit portion (26), wherein the first circuit portion (24) and the second circuit portion (26) are electrically connected to the constant-current driver chip (22). According to the backlight drive circuit and the method for shortening the soft starting time of the backlight drive circuit, a voltage detection circuit of a soft starting pin is added to control the drive signal frequency of the constant-current driver chip to set sizes of resistors, the size of the frequency of drive signals of a first thin film transistor is changed, during soft start, the charging speed of a second capacitor is increased, the soft starting time during starting up is shortened, currents passing through inductors and the first thin film transistor during starting up are reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a backlight driving circuit and a method for reducing the soft start time of the backlight driving circuit. Background technique [0002] A liquid crystal display (LCD, Liquid Crystal Display) has many advantages such as a thin body, power saving, and no radiation, and has been widely used. Most of the liquid crystal display devices currently on the market are backlight liquid crystal display devices, which include a liquid crystal panel and a backlight module. The working principle of the liquid crystal panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The rotation of liquid crystal molecules is controlled by applying a driving voltage on the two parallel glass substrates. , to refract the light from the backlight module to generate a picture. Since the liquid ...

AI Technical Summary

Problems solved by technology

[0004] When the constant current driving chip 100 is soft-started, the driving frequency of the driving signal output to the thin film transistor Q100 is the same as the driving frequency during normal operation. The frequency is set to be small, so each cycle time is longer, resulting in a longer time for soft start, which affects the boot speed of display devices (such as TVs, etc.)

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