[Study of LED chip spectrum acquisition system based on CPLD].
The light emitting diode (LED) chip spectrum inspection is a key technology in LED chip scaled manufacturing. According to the principle of spectrum inspection and aiming at the demand of applications of LED chip spectrum inspection, the present paper studies the spectrum acquisition system based on complex programmable logic device (CPLD). The CPLD, the main chip, provides the working timing signal to the linear charge coupled device (CCD) and controls the signal modulating, conversion and storage, and transmission of sampling rate and data in transfer module. The system adopts raster monochromator as prismatic parts of apparatus and linear CCD as photoelectricity conversion parts to inspect the opposite spectrum energy distributing curve, and mean while calculate the spectrum parameter of LED chip photics characteristic. Based on the CPLD , the LED chip spectrum acquisition system with the virtues of simplicity and celerity satisfies the precision request of LED chip spectrum inspection.
Shi
Wei
W
School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China. yanstone8697@yahoo.com.cn
Zhou
Da-Bing
DB
Dong
Zhan-Min
ZM
Sun
Hong-San
HS
Xi
An-Min
AM