Color cathode ray tube with infrared emitting phosphor in screen

Details Color cathode ray tube with infrared emitting phosphor in screen Color cathode ray tube with infrared emitting phosphor in screen

1983-05-18

1986-01-21

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313467, 313472, 313474, H01J 2907, H01J 2920, H01J 2932

Patent

active

045659460

ABSTRACT:
In order to permit reliable light pen interaction with a black matrix shadow mask CRT, the conventional black carbon matrix is replaced by an IR phosphor. This provides a component of IR radiation irrespective of the particular color of the visible display at any given point, and such component can be detected by conventional silicon photodetector light pens. Preferably the particle size of the IR phosphor is substantially less than that of the primary color phosphors so as to largely retain both the packing density of the original black matrix and the edge definition at the IR phosphor/primary color phosphor boundaries. The IR phosphor particles are also pigmented with black graphite to retain the light-absorbing qualities of the original black matrix.

REFERENCES:
patent: 2945087 (1960-07-01), Graham et al.
patent: 3018405 (1962-01-01), Oxenham
patent: 3384712 (1968-05-01), Gruen
patent: 3691424 (1972-09-01), Goodman
patent: 4100452 (1978-07-01), Kaplan
patent: 4135113 (1979-01-01), Tsuneta et al.

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