Electric lamp and discharge devices: systems – Cathode ray tube circuits – With radiant energy sensitive control means
Patent
1993-01-11
1994-08-30
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
With radiant energy sensitive control means
348813, H01J 3126
Patent
active
053431197
ABSTRACT:
A display device includes a beam index type cathode ray tube having a fluorescent screen on which red, green and blue fluorescent materials are formed in strip configurations and further index fluorescent materials are formed in strip configurations with a predetermined pitch, a sensor for converting light generated from the index fluorescent materials into an electric signal when an electron beam is impinged on the index fluorescent materials upon horizontal scanning of the electron beam with respect to the fluorescent screen, and for multiplying the converted electric signal, an index signal processing circuit for switching red, green and blue signals in accordance with the multiplied electric signal from the sensor, and for controlling luminance of the cathode ray tube in accordance with a luminance level control signal, and a driving voltage generating circuit for controlling a driving voltage applied to the sensor in accordance with the luminance level control signal to thereby control a multiplication ratio of the sensor.
REFERENCES:
patent: 3163713 (1964-12-01), Rudd
Blum Theodore M.
Eslinger Lewis H.
Maioli Jay H.
Sony Corporation
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