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

fYear

2011

fDate

5-8 Dec. 2011

Firstpage

944

Lastpage

947

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics and Drive Systems (PEDS), 2011 IEEE Ninth International Conference on

Conference_Location

Singapore

ISSN

2164-5256

Print_ISBN

978-1-61284-999-7

Electronic_ISBN

2164-5256

Type

conf

DOI

10.1109/PEDS.2011.6147368

Filename

6147368