High-brightness and high-resolution projection CRT

Zulun Lin; Jianbo Cheng; Kangcheng Qi; Quan Jian; Guogao Huang

doi:10.1117/12.319661

18 August 1998 High-brightness and high-resolution projection CRT

Zulun Lin, Jianbo Cheng, Kangcheng Qi, Quan Jian, Guogao Huang

Proceedings Volume 3560, Display Devices and Systems II; (1998) https://doi.org/10.1117/12.319661
Event: Photonics China '98, 1998, Beijing, China

Abstract

A new 3-in. projection CRT that YAG(Y₃Al₅O₁₂) single crystal is used for the substrate of the phosphor screen has been developed. This phosphor screen has a number of unusual properties. The substrate has a very high coefficient of thermal conductivity and a high transparency. To obtain matched sealing, a low melting point solder has been developed to combine the substrate with the glass envelope. An electrostatic-electromagnetic focusing electron gun with large emitting current and high-resolution is developed. As a result, beam spot diameters of 0.065 mm and 0.080 mm are achieved at cathode currents of 0.5 and 1 mA, respectively. The focusing luminance is 1.4 X 10⁵ cd/m² for green phosphor-screen at cathode current of 1 mA and the anode voltage of 29 KV. The focusing luminances of red phosphor-screen and blue phosphor screen are 6.4 X 10⁴ cd/m² and 8 X 10³ cd/m² at cathode current of 1 mA, respectively. Thus, the projection TV set using these projection tubes has achieved high-brightness, high-resolution and high-contrast image display.

Citation Download Citation

Zulun Lin, Jianbo Cheng, Kangcheng Qi, Quan Jian, and Guogao Huang "High-brightness and high-resolution projection CRT", Proc. SPIE 3560, Display Devices and Systems II, (18 August 1998); https://doi.org/10.1117/12.319661

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KEYWORDS

CRTs

YAG lasers

Crystals

Glasses

Aluminum

Electromagnetism

Electron beams

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