Control device for starting LCD power supply

Abstract

The invention particularly discloses a control device for starting an LED power supply. A power interface of an LED controller is connected with a logic power supply of an LED, and the output end of the power interface is connected with the first input end which makes a signal to generate a module and the control signal input end of the LED; the output end which makes a signal to generate a module is connected with an enabling pin of a backlight power supply chip; the output end of the backlight power supply chip is connected with a backlight power supply of the LED; after the LED controller is started, a control signal is output to an enabling signal generating module and the LED; and the enabling signal generating module receives the control signal of the LED controller, and outputs the enabling signal to the backlight power supply chip, so that the backlight power supply chip can light the backlight source of the LED. The control device is adopted to effectively guarantee the starting of the backlight power supply of the LED on the logical power supply after electricity switching, and ensure correct order starting of the logic power supply of the LED and the backlight power supply.

Description

technical field [0001] The invention relates to the field of control, in particular to a control device for starting an LCD power supply. Background technique [0002] Liquid Crystal Display (LCD: Liquid Crystal Display) is to place liquid crystals between two parallel glasses. There are many vertical and horizontal small wires between the two glasses. The direction of the rod-shaped crystal molecules is controlled by electrifying or not. The light is refracted to create the picture. [0003] LCD generally needs two power supplies, including logic power supply and backlight power supply. Since the life of the LCD is generally limited by the life of the backlight, and most of the power consumption of the LCD is consumed by the backlight. Therefore, if the backlight is turned on frequently when it is not needed, it will not only affect the service life of the LCD as a whole, but also increase the power consumption of the LCD. Based on the above reasons, in order to ensure t...

AI Technical Summary

Problems solved by technology

[0008] However, using the control device described in the prior art, the backlight power supply is enabled according to the order in which the internal programs of the CPU controller 1a are executed. Since the CPU controller 1a cannot obtain the logic power supply of the LCD 1d and the status information of the LCD controller 1b, it cannot It is clear whether the LCD 1d logic power supply is powered on and the LCD controller 1b startup is completed when the backlight is turned on, so it cannot be guaranteed that the LCD 1d logic power supply and the backlight power supply are started in the correct order

Images