Photoconductive-electroluminescent memory effect polychromatic display
First Claim
1. A polychromatic display, comprising:
- a first structure having a first transparent substrate equipped with a first electroluminescent layer placed between a first system of transparent electrodes and a second system of electrodes, said first and second systems of electrodes connected to a first electrical means permitting the excitation of certain zones of the first electroluminescent layer, a second structure having a second substrate equipped with a second electroluminescent layer and a photoconductive layer stacked on one another and covering the entire display surface, said second electroluminescent layer being placed in direct contact with said photoconductive layer for obtaining a PC-EL effect, said photoconductive and second electroluminescent layers being placed between a third system of transparent electrodes and a fourth system of transparent electrodes, said third and fourth systems of electrodes being connected to a second electrical means for effecting the excitation of certain zones of the second electroluminescent layer, said first and second substrates constituting opposite faces of the display, and and wherein the first electroluminescent layer has a monochromatic or dichromatic emission spectrum, and the second electroluminescent layer has an essentially monochromatic emission spectrum and a chromatic component complementary of the emission color or colors of the first electroluminescent layer.
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Abstract
A photoconductive-electroluminescent, memory effect polychromatic display defining a first and second inverted structure. The first structure incorporates a first transparent substrate equipped with a first electroluminescent layer El1 placed between a first and a second electrode system, which are connected to a first electrical source for exciting certain zones of layer El1. The second inverted structure incorporates a second substrate equipped with a second electroluminescent layer El2 and a photoconductive layer stacked on one another. These two layers are inserted between a third and a fourth electrode system which are connected to a second electrical source for exciting certain zones of the layer El2. The electroluminescent layer El1 has a monochromatic or dichromatic emission spectrum and the electroluminescent layer El2 has a monochromatic emission spectrum essentially complementary to layer El1.
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Citations
19 Claims
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1. A polychromatic display, comprising:
- a first structure having a first transparent substrate equipped with a first electroluminescent layer placed between a first system of transparent electrodes and a second system of electrodes, said first and second systems of electrodes connected to a first electrical means permitting the excitation of certain zones of the first electroluminescent layer, a second structure having a second substrate equipped with a second electroluminescent layer and a photoconductive layer stacked on one another and covering the entire display surface, said second electroluminescent layer being placed in direct contact with said photoconductive layer for obtaining a PC-EL effect, said photoconductive and second electroluminescent layers being placed between a third system of transparent electrodes and a fourth system of transparent electrodes, said third and fourth systems of electrodes being connected to a second electrical means for effecting the excitation of certain zones of the second electroluminescent layer, said first and second substrates constituting opposite faces of the display, and and wherein the first electroluminescent layer has a monochromatic or dichromatic emission spectrum, and the second electroluminescent layer has an essentially monochromatic emission spectrum and a chromatic component complementary of the emission color or colors of the first electroluminescent layer.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
Specification