Title :
A highly accurate piezoelectric actuator driver IC for auto-focus in camera module of mobile phone
Author :
Park, Chanwoo ; Cha, Sanghyun ; Lee, Yuenjoong ; Kwon, Ohjo ; Park, Deukhee ; Kwon, Kyoungsoo ; Lee, Jaeshin
Author_Institution :
UM Solution Lab., Samsung Electro-Mech., Suwon, South Korea
fDate :
May 30 2010-June 2 2010
Abstract :
The piezoelectric actuator is one of suitable approach for implementing Auto-Focus (AF) function in camera modules for mobile phone. In this paper, the piezoelectric actuator driver IC for AF in camera modules is designed. In the driver IC, three techniques are used for highly accurate lens position, which are self position control algorithm, Time Division Driving (TDD) scheme and frequency sweep control. With accurate lens position techniques, the lens position can be controlled within 3μm. The die area of designed driver IC is 2.0 × 1.6mm2 and power consumption is 2.8mW.
Keywords :
cameras; mobile handsets; piezoelectric actuators; position control; auto focus function; camera module; frequency sweep control; lens position technique; mobile phone; piezoelectric actuator; power 2.8 mW; power consumption; self position control algorithm; time division driving scheme; Cameras; Electrodes; Energy consumption; Focusing; Frequency; Lenses; Mobile handsets; Piezoelectric actuators; Position control; Ultrasonic imaging;
Conference_Titel :
Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-5308-5
Electronic_ISBN :
978-1-4244-5309-2
DOI :
10.1109/ISCAS.2010.5537267
