Electric lamp and discharge devices – Cathode ray tube – Screen
Patent
1990-08-10
1992-03-31
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Screen
H01J 2989
Patent
active
051011360
ABSTRACT:
A high-efficiency cathodoluminescent screen for high-luminance cathode-ray tubes has a design which makes possible a considerable improvement of the luminance. The cathodoluminescent screen of the invention includes a glass substrate (11) carrying a luminescent screen (12) consisting of luminophor grains. According to a characteristic of the invention, an intermediate screen (15) is inserted between luminescent screen (12) and substrate (11), with the intermediate screen (15) having a refraction index n1 which is clearly greater than refraction index n0 of substrate (11). As a result of this arrangement, a considerable part of the light which penetrates intermediate layer (15) is reflected in the direction of luminescent layer (12), so that this light can then be rediffused to substrate (11), i.e., to use, with an emission indicatrix which is much more greatly concentrated on the axis than in the prior art.
REFERENCES:
patent: 4310783 (1982-01-01), Temple et al.
patent: 4310784 (1982-01-01), Anthon et al.
patent: 4633131 (1986-12-01), Khurgin
patent: 4634926 (1987-01-01), Vriens et al.
Patent Abstracts of Japan, vol. 6, No. 64 (E-103)[942], Apr. 23, 1982; & JP-A-57 7048 (Tokyo Shibaura Denki K.K.) 1-14-1982.
Courtan Bernard
Gibilini Daniel
DeMeo Palmer C.
Thomson Tubes Electroniques
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