Contrast enhancement structure for color cathode ray tube

Electric lamp and discharge devices – Cathode ray tube – Envelope

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313474, 358253, H01J 3100

Patent

active

046635629

ABSTRACT:
A contrast enhancement structure for a full color cathode ray tube utilizes a combination of a louvered ambient light transmission control element in combination with a multi-notch band-pass filter. The louvered control elements provide limited viewing angles for incoming ambient light reducing light dispersion on the cathode ray phosphor surface. The multi-notch band-pass filter provides efficient spectral transmission in the phosphor emitting wavelengths. The combination of the louvered directional control elements for ambient light and a multi-notch band-pass filter matching the spectral emission characteristics of the color phosphor, substantially increases the contrast ratio. In fact, this arrangement provides contrast ratios which are of an order of magnitude larger than those previously possible.

REFERENCES:
patent: 2388203 (1945-10-01), Zindel
patent: 3909524 (1975-09-01), Ohkoshi et al.
patent: 4245242 (1981-01-01), Trcka
"Kinescope Contrast Improvement in the Presence of Ambient Light", Alton J. Torre, 12/57, RCA TN No.: 61.

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