Electroluminescent lamp
First Claim
1. An EL lamp comprising:
- a first laminate having a first transparent electrode, and a first luminescent layer;
a second laminate on said first laminate, said second laminate having a second transparent electrode, a second luminescent layer and an insulating layer; and
a rear electrode on said second laminate;
wherein a dielectric constant between said first transparent electrode and said second transparent electrode is smaller than a dielectric constant between said second transparent electrode and said rear electrode.
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Abstract
The difference of luminance between a front surface side and a rear surface side as viewed from the front surface side is reduced in a multi-layered EL lamp. An EL lamp includes a first laminate formed by serially laminating a first transparent electrode, a first luminescent layer and a first insulating layer, a second laminate formed by serially laminating a second transparent electrode, a second luminescent layer and a second insulating layer on the first laminate, and a rear electrode formed on the second laminate, wherein a dielectric constant between the first and second transparent electrodes is set to a value smaller than a dielectric constant between the second transparent electrode and the rear electrode. This can be achieved by limiting the amount of a high dielectric material to be mixed in the first insulating layer to not greater than 90% in terms of a weight ratio of a high dielectric material mixed in the second insulating layer, or by increasing the thickness of the first luminescent layer to 130 to 250% of the thickness of the second luminescent layer. After the adjustment is made in this way, the thickness of the first insulating layer may be set to not greater than 90% of the thickness of the second insulating layer or may be omitted.
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Citations
13 Claims
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1. An EL lamp comprising:
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a first laminate having a first transparent electrode, and a first luminescent layer;
a second laminate on said first laminate, said second laminate having a second transparent electrode, a second luminescent layer and an insulating layer; and
a rear electrode on said second laminate;
wherein a dielectric constant between said first transparent electrode and said second transparent electrode is smaller than a dielectric constant between said second transparent electrode and said rear electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification