Study On Novel FED Test Technology

Flat panel display (FPD) test technology is a hot subject among display field. This paper puts forward FED parameters and test methods, parameters, steps and signals for photoelectric characteristic of panel units. Also, test systems including test instruments, signal sources and supply power for FED parameters and photoelectric characteristic of panel units.Test parameters of each display including CRT, LCD, PDP and LED were compared with and analyzed in detail. Photoelectric characteristics of panel unit of FED were analyzed. Emphases were put on transferring the key parameters of FED into themes that can be tested in practical by learning the display test standards from both domestic and abroad. The author analyzed test signals and steps of each display test standard, and drew the meaningful contents for FED tests. Finally, test technologies and evaluation methods were creatively established.The test standards and evaluation methods were verified by lab-made 25 inch FED panel. The results show that 25 inch color FED sample has been fabricated in our lab can display video image and obtain its brightness about 400cd/m2,contrast ratio 1000:1,256 circuit gray scales.This paper also introduces the following contents according to principle of field emission and Human Visual System (HVS): The display principle of FED panel and Pulse Width Modulation (PWM), the reason why PWM was used in FED system, driving method of PWM and two PWM methods used in present FED sample.