Color adjustable LED driver design based on PWM

Yiying Du; Caideng Yu; Longcheng Que; Yun Zhou; Jian Lv

doi:10.1117/12.971205

15 October 2012 Color adjustable LED driver design based on PWM

Yiying Du, Caideng Yu, Longcheng Que, Yun Zhou, Jian Lv

Proceedings Volume 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy; 841928 (2012) https://doi.org/10.1117/12.971205
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

Light-emitting diode (LED) is a liquid cold source light source that rapidly develops in recent years. The merits of high brightness efficiency, long duration, high credibility and no pollution make it satisfy our demands for consumption and natural life, and gradually replace the traditional lamp-house-incandescent light and fluorescent light. However, because of the high cost and unstable drive circuit, the application range is restricted. To popularize the applications of the LED, we focus on improving the LED driver circuit to change this phenomenon. Basing on the traditional LED drive circuit, we adopt pre-setup constant current model and introduce pulse width modulation (PWM) control method to realize adjustable 256 level-grays display. In this paper, basing on human visual characteristics and the traditional PWM control method, we propose a new PWM control timing clock to alter the duty cycle of PWM signal to realize the simple gamma correction. Consequently, the brightness can accord with our visual characteristics.

Citation Download Citation

Yiying Du, Caideng Yu, Longcheng Que, Yun Zhou, and Jian Lv "Color adjustable LED driver design based on PWM", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 841928 (15 October 2012); https://doi.org/10.1117/12.971205

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KEYWORDS

Light emitting diodes

Clocks

LED displays

Visualization

Modulation

Eye

Light sources

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