Thin-film EL display device having a high-contrast ratio
First Claim
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1. A thin-film EL display device having a high-contrast ratio comprising:
- a transparent ceramic substrate;
a background electrode formed on the lower surface of said ceramic substrate;
a photochromism layer formed on the upper surface of said ceramic substrate, said photochromism layer being black-colored when exposed to a required wavelength of light; and
a fluorescent layer, an insulating layer and a transparent electrode sequentially formed on the upper surface of the photochromism layer.
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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 Å to 5,100 Å. 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.
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Citations
9 Claims
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1. A thin-film EL display device having a high-contrast ratio comprising:
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a transparent ceramic substrate; a background electrode formed on the lower surface of said ceramic substrate; a photochromism layer formed on the upper surface of said ceramic substrate, said photochromism layer being black-colored when exposed to a required wavelength of light; and a fluorescent layer, an insulating layer and a transparent electrode sequentially formed on the upper surface of the photochromism layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification