Laminated thick film dielectric structure for thick film dielectric electroluminescent displays
First Claim
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1. An electroluminescent display comprising an improved composite thick film dielectric structure, said structure comprising;
- a composite thick film dielectric layer;
one or more layers of aluminum oxide or aluminum oxide doped with other atomic species provided on the top surface of said composite thick film dielectric layer, said material sufficiently thick to act as a barrier to deleterious ions and also be minimally electrically conductive;
a thin film phosphor layer;
wherein at least of one said one or more layers of said aluminum oxide or aluminum oxide doped with other atomic species is not in direct contact with said phosphor layer.
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Abstract
A novel and improved composite thick film dielectric structure is provided to improve the operating stability of phosphors used in thick dielectric ac electroluminescent displays. The novel structure comprises one or more aluminum oxide layers disposed between the composite thick dielectric layer and the bottom of the phosphor layer of these displays.
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Citations
28 Claims
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1. An electroluminescent display comprising an improved composite thick film dielectric structure, said structure comprising;
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a composite thick film dielectric layer; one or more layers of aluminum oxide or aluminum oxide doped with other atomic species provided on the top surface of said composite thick film dielectric layer, said material sufficiently thick to act as a barrier to deleterious ions and also be minimally electrically conductive; a thin film phosphor layer; wherein at least of one said one or more layers of said aluminum oxide or aluminum oxide doped with other atomic species is not in direct contact with said phosphor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An electroluminescent display comprising a thick film dielectric structure, said structure comprising:
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(a) a composite thick film dielectric layer; (b) a layer of aluminum oxide provided on top adjacent to said composite thick film dielectric structure; (c) a layer of barium titanate on top of (b); (d) an optional layer of barium tantalate on top of (c); and (e) optionally a further layer of aluminum oxide provided on top of (c) and/or on top of (d). - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification