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

fYear

2010

fDate

May 30 2010-June 2 2010

Firstpage

1284

Lastpage

1287

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISCAS.2010.5537267

Filename

5537267