交流發光二極體特性之研究

Abstract

By applying the sine wave to drive the red light, green light, and blue light LEDs, this thesis examines the effectiveness of the frequency, current, and temperature on the optoelectronic characteristics. Results show that: (1) The optoelectronic characteristics of LEDs can be changed by adjusting the frequency. (2) The driving current affects the dominant wavelength and color shift of the LED output. (3) Increasing temperature causes dominant wavelength shifting and luminous efficacy decay. By dimming the LED light output with sine wave amplitude modulation, it changes the chromaticity coordinates of the RGB LEDs, which in turn causes a color shift. Color shifting defects can be overcome by dimming the LEDs with a high frequency sine-wave and low frequency pulse width modulation method.

Date of Award	2009
Original language	Chinese (Traditional)
Supervisor	Chih-Lung Lin (Supervisor) & Tsorng-Juu Liang (Supervisor)