High-luminance and High-resolution YAG Projection Display Tube

In this paper. a 7.6 cm high-densely packed phosphor sereen with a multi-layer interftrence filter is introduced by depositing phosphor on YAG faceplate using centrifugal sedimentation method. Its envelope is made of a kind of glass whose expansion coefficient is well matched with that of YAG. The electron gun consisting of an optimally designed pre-focusing lens and main focusing lens is improved for HDTV display application. The measurement results show that the green, red and blue tubes have the luminance of 1.4×105, 6.2×104 and 8×103cd/m2 at a cathode current of 1.0 mA and an anode voltage of 29 kV, respectively, with a half-intensity line-width of 85 μm. An experimental 122 cm rear and 183 cm front projection TV set using YAG projection tubes achieves more than 1 000 TV lines horizontal resolution and 624 cd/m2 and 890 cd/m2 luminance, respectively, with an age of 5 000 hours.