CRT display device with variable light transmission panel

Details CRT display device with variable light transmission panel CRT display device with variable light transmission panel

1989-12-22

1991-10-22

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358252, 358253, H04N 572

Patent

active

050600753

ABSTRACT:
The contrast of a luminescent image produced by a CRT display device is improved by disposing a variable light transmissivity panel adjacent the CRT faceplate to intercept and attenuate ambient light reflected from the screen of the CRT. Control circuitry is provided to effect a decrease in the transmissivity of the panel in response to increasing ambient light intensity. The circuitry also effects an increase in the electron beam current with increasing ambient light intensity to increase the intensity of the luminescent image produced by the electron beam. When the device is not operating, the panel has a very low transmissivity causing the faceplate to appear dark.

REFERENCES:
patent: 4338000 (1982-07-01), Kamimori et al.
patent: 4672457 (1987-06-01), Kyatt
Saxe et al. "Suspended Particle Display with Improved Properties" 1982 International Display Research Conference, pp. 177-179/ 5-82.
Rachner et al. "New Results in Colloid Display Technology SAE Technical" Paper Series 2-28 pp. 1-8.

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