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A high‐luminance and high‐resolution CRT for projection HDTV display
Author(s) -
Wang Qionghua,
Cheng Jianbo,
Lin Zulun,
Yang Gang
Publication year - 1999
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1984474
Subject(s) - phosphor , materials science , luminance , optics , cathode ray tube , backlight , interference filter , high definition television , optoelectronics , liquid crystal display , physics , computer science , telecommunications , wavelength
Abstract— We have developed a 3‐in. YAG (yttrium aluminum garnet) projection CRT for an HDTV display. The densely packed phosphor screen with a multi‐layer interference filter is prepared by depositing phosphor on a YAG faceplate using a centrifugal sedimentation method. The tube's envelope is made from a glass whose expansion coefficient is well‐matched with that of YAG. The focusing characteristics of an optimally designed pre‐focusing electron gun and focusing magnet are improved for a HDTV display application. As a result, the green, red, and blue tubes reached luminances of 1.4 × 10 5 , 6.2 × 10 4 , and 8 × 10 3 cd/m 2 at a cathode current of 1.0 mA and an anode voltage of 29 kV, respectively, with a half‐intensity linewidth of 85 μm. An experimental 48‐in. rear‐projection TV set using the YAG projection tubes achieves more than 1000‐TV‐lines horizontal resolution and 300‐cd/m 2 mean white luminance.