Title :
Application of electromagnetic focusing electron gun in YAG projection CRT
Author :
Jun, Wang ; Min, Zhou ; Jianbo, Cheng ; Qijun, Ran
Author_Institution :
Dept. of Opto-Electron., Univ. of Electron. Sci. & Technol., Chengdu, China
Abstract :
An electromagnetic focusing electron gun was used in high-luminance and high-definition YAG (yttrium aluminum garnet) projection CRT successfully. The dual-focusing system in it was developed, which was composed of electrostatic pre-focusing lens and electromagnetic focusing lens. Result from the special optimization of structure and voltage, the electron gun has excellent characteristics especially with high current. As a result, on the green YAG phosphor screen, beam spot diameters of 0.065-0.080 mm at cathode currents of 0.5-1.0 mA. So the horizontal resolution was more than 1200 TV-lines on the 3-in projection CRT screen. Meanwhile, the luminance of 1.4×10 5 cd/m2 at cathode current of 1.0 mA and anode voltage of 29 kv was achieved
Keywords :
cathode-ray tube displays; electron beam focusing; electron guns; fluorescent screens; garnets; yttrium compounds; 1.0 mA; 29 kV; 3 in; YAG; YAG phosphor screen; YAl5O12; dual-focusing system; electromagnetic focusing electron gun; electromagnetic focusing lens; electrostatic pre-focusing lens; luminance; projection CRT; Aluminum; Anodes; Cathode ray tubes; Electrons; Electrostatics; Garnets; Lenses; Phosphors; Voltage; Yttrium;
Conference_Titel :
Information Display, 1999. ASID '99. Proceedings of the 5th Asian Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
957-97347-9-8
DOI :
10.1109/ASID.1999.762730
