Color display apparatus including a CRT with internal switching

Details Color display apparatus including a CRT with internal switching Color display apparatus including a CRT with internal switching

1984-04-11

1987-04-21

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

313103CM, 313473, 315375, H04N 927, H01J 2910, H01J 2980, H01J 4300

Patent

active

046600760

ABSTRACT:
A display apparatus which comprises a display tube having a channel plate electron multiplier and a penetron screen having an electrode (hereinafter termed the screen electrode) thereon by which an accelerating field is provided between the electron multiplier and the screen. In order to obtain rapid switching of the voltage applied to the screen electrode, a high voltage power supply has a thermionic valve included within the display tube envelope to shunt current to ground when switching from a high voltage to a low voltage. The anode and cathode of the valve are connected respectively to the screen electrode and the electron gun cathode. The valve may be a triode or tetrode. A feedback arrangement is provided which causes the voltage on the screen electrode to remain substantially constant in spite of variations in screen current.

REFERENCES:
patent: 3860849 (1975-01-01), Schagen et al.
patent: 4281272 (1981-07-01), Spilsbury
patent: 4450387 (1984-05-01), Reed et al.
Washington, D., et al., "Technology of Channel Plate Manufacture", Acta Electronica, vol. 14, No. 2, Apr. 1971, pp. 201-224.
Spencer, G. R., "Performance of Penetration Color CRTs in Single-Anode and Dual-Anode Configurations", Proceedings of the SID vol. 22/1, 1981, pp. 15-17.

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