Electroluminescent laminate with thick film dielectric
First Claim
1. An electroluminescent laminate comprising:
- a planar phosphor layer;
a front and a rear planar electrode on either side of the phosphor layer;
a rear substrate on which the rear electrode is formed, the substrate having sufficient rigidity to support the laminate; and
a planar dielectric layer between the rear electrode and the phosphor layer, the dielectric layer being formed from a sintered ceramic material such that the dielectric layer provides a dielectric strength greater than about 1.0×
106 V/m and a dielectric constant such that the ratio of the dielectric constant of the dielectric layer to that of the phosphor layer is greater than about 50;
1, the dielectric layer having a thickness such that the ratio of the thickness of the dielectric layer to that of the phosphor layer is in the range of about 20;
1 to 500;
1, and the dielectric layer having a surface adjacent the phosphor layer which is sufficiently smooth that the phosphor layer illuminates generally uniformly at a given excitation voltage.
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Accused Products
Abstract
An improved dielectric layer of an electroluminescent laminate, and method of preparation are provided. The dielectric layer is formed as a thick layer from a ceramic material to provide:
a dielectric strength greater than about 1.0×106 V/m;
a dielectric constant such that the ratio of the dielectric constant of the dielectric material to that of the phosphor layer is greater than about 50:1;
a thickness such that the ratio of the thickness of the dielectric layer to that of the phosphor layer is in the range of about 20:1 to 500:1; and
a surface adjacent the phosphor layer which is compatible with the phosphor layer and sufficiently smooth that the phosphor layer illuminates generally uniformly at a given excitation voltage.
The invention also provides for electrical connection of an electroluminescent laminate to voltage driving circuity with through hole technology. The invention also extends to laser scribing the transparent conductor lines of an electroluminescent laminate.
192 Citations
38 Claims
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1. An electroluminescent laminate comprising:
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a planar phosphor layer; a front and a rear planar electrode on either side of the phosphor layer; a rear substrate on which the rear electrode is formed, the substrate having sufficient rigidity to support the laminate; and a planar dielectric layer between the rear electrode and the phosphor layer, the dielectric layer being formed from a sintered ceramic material such that the dielectric layer provides a dielectric strength greater than about 1.0×
106 V/m and a dielectric constant such that the ratio of the dielectric constant of the dielectric layer to that of the phosphor layer is greater than about 50;
1, the dielectric layer having a thickness such that the ratio of the thickness of the dielectric layer to that of the phosphor layer is in the range of about 20;
1 to 500;
1, and the dielectric layer having a surface adjacent the phosphor layer which is sufficiently smooth that the phosphor layer illuminates generally uniformly at a given excitation voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. In an electroluminescent laminate having a phosphor layer sandwiched between a front and a rear electrode, the rear electrode being formed on a substrate and the phosphor layer being separated from the rear electrode by a dielectric layer, the improvement comprising:
the dielectric layer being formed from at least two layers, a first dielectric layer formed on the rear electrode, and a second dielectric layer formed on the first dielectric layer, the second layer having a surface which is sufficiently smooth that the phosphor layer illuminates generally uniformly at a given excitation voltage, the first and second dielectric layers being formed from sintered ceramic materials to provide a dielectric strength greater than about 1.0×
106 V/m and a dielectric constant such that the ratio of the dielectric constant of the dielectric layer to that of the phosphor layer is greater than about 50;
1, the combined thickness of the first and second layers being such that the ratio of the thickness of the dielectric layer to that of the phosphor layer is in the range of about 20;
1 to 500;
1.- View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
Specification