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1. (WO2018121707) DEVICE FOR CONTROLLING BRIGHTNESS OF MOBILE PHONE SCREEN

Pub. No.:    WO/2018/121707    International Application No.:    PCT/CN2017/119671
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Sat Dec 30 00:59:59 CET 2017
IPC: G09G 3/34
H05B 33/08
Applicants: GUANGZHOU XINGPU ELECTRONIC TECHNOLOGY CO., LTD
广州兴普电子科技有限公司
Inventors: LUO, Wei
罗伟
Title: DEVICE FOR CONTROLLING BRIGHTNESS OF MOBILE PHONE SCREEN
Abstract:
A device for controlling the brightness of a mobile phone screen, comprising a mobile phone screen light source module, a rectifying processing module, a triac dimmer, a first constant current controller, a second constant current controller, an electrolytic capacitor, a first rectifier diode, a second rectifier diode, a first sampling resistor, and a second sampling resistor. Because the first constant current controller can be turned on to provide an anode forward current needed for keeping the triac dimmer turned on; moreover, a high power factor value is provided, adjustment can easily be implemented, a circuit is simple in structure, and low costs are needed. In addition, when the rectified bus voltage is less than the turn-on voltage drop of the mobile phone screen light source, the electrolytic capacitor supplies electricity to the mobile phone screen light source, so that a mobile phone screen light source lamp string continues in an operating state when the rectified bus voltage is less than the turn-on voltage drop of the mobile phone screen light source; moreover, by removing stroboscopic components of the mobile screen light source, the stroboscopic phenomenon can be prevented, and an operating input voltage range is widened.