Title :
Integrated ambient light sensor on a LED driver chip
Author :
Wu, Jian-Fu ; Wei, Chia-Ling ; Hsieh, Yuan-Ta ; Fang, Chiao-Li ; Tsai, Hann-Huei ; Juang, Ying-Zong
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
This paper presents a boost-type light-emitting-diode (LED) driver with an on-chip ambient light dimming for the liquid crystal display (LCD) backlight module in portable electronics. The proposed system integrates an ambient light sensor (ALS) to achieve the function of dimming control. By sensing the surrounding illumination, the LED driver automatically regulates the LED current, and, hence, the power dissipation of LED backlight module can be effectively reduced. As a result, the battery life can be extended.
Keywords :
driver circuits; light emitting diodes; liquid crystal displays; LCD backlight module; LED current regulation; LED driver chip; battery life; boost-type light emitting diode driver; integrated ambient light sensor; liquid crystal display; on-chip ambient light dimming; portable electronics; power dissipation; surrounding illumination; Light emitting diodes; Lighting; Metals; Photodiodes; Power demand; Resistors; System-on-a-chip;
Conference_Titel :
Power Electronics and Drive Systems (PEDS), 2011 IEEE Ninth International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-61284-999-7
Electronic_ISBN :
2164-5256
DOI :
10.1109/PEDS.2011.6147368
