Thin-film EL display device having a high-contrast ratio

Details Thin-film EL display device having a high-contrast ratio Thin-film EL display device having a high-contrast ratio

1991-03-13

1992-01-28

DeMeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313509, H05B 3322

Patent

active

050846507

ABSTRACT:
A thin-film EL display having a high-contrast ratio comprising a transparent ceramic substrate. A background electrode is formed on the lower surface of the ceramic substrate. A photochromism layer is formed on the upper surface of the ceramic substrate. The photochromism layer is black-colored when exposed to a required wavelength of light of 3,500 .ANG. to 5,100 .ANG.. Therefore, it is possible to avoid decrease in the contrast of the display device which may be caused by external light or light emitted from the fluorescent layer itself.

REFERENCES:
patent: 3560784 (1971-02-01), Steele et al.

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