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18 August 1998 Electron gun for high-performance color display tubes
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In order to design a high-performance electron gun, a new design concept was adapted to reduce the spherical aberration and coma of the electron optical system. In the electron gun we used a new asymmetric beam-forming region (BFR) and asymmetric main lens. This gun has been used for 40 cm 0.28 mm-pitch full square color display tubes. At cathode current of 0.2 microampere, the spot size on the screen center was measured 0.65 mm (10% of the maximum current distribution), and at the cathode current of 0.2 - 0.5 microampere, the focus voltage difference (focus trial characteristic) is less than 150 V. When the horizontal- scanning frequency reached 57 kHz, the tubes using the electron gun can display 1024 X 768 dots, and the corner- center focus performance is good. So it can meet the requirements of 40 cm 0.28 mm CDT of the market. In this design we used computer simulation software called Electron Beam Simulation to simulate the BFR and the main lens, through it we can adjust the lens structure, predict the performance and make it better. A good coincidence is obtained between the calculations and experiment results.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fangqin Wang and Zhanfeng Dong "Electron gun for high-performance color display tubes", Proc. SPIE 3560, Display Devices and Systems II, (18 August 1998);

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