Organic light emitting diode display for suppressing reflection of external light
First Claim
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1. An organic light emitting diode (OLED) display device, comprising:
- a first substrate;
an organic light emitting element formed over the first substrate, wherein the organic light emitting element comprise i) first and second electrodes and ii) an organic emission layer interposed between the first and second electrodes;
a driving circuit formed over the substrate and configured to drive the organic light emitting element;
a cholesteric liquid crystal (CLC) layer formed over the organic light emitting element and configured to selectively transmit or reflect circularly polarized light;
a translucent metal layer formed on the CLC layer and configured to partially transmit and partially reflect incoming light;
a retardation plate formed on the translucent metal layer and configured to input one of i) linearly polarized light and ii) circularly polarized light, and output the other light; and
a polarizing plate formed on the retardation plate and configured to transmit a portion of incoming light that matches a polarizing axis of the polarizing plate, and absorb the remaining incoming light that does not match the polarizing axis thereof.
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Abstract
An organic light emitting diode (OLED) display device is disclosed. In one embodiment, the OLED device includes 1) an organic light emitting element configured to emit light, 2) a cholesteric liquid crystal (CLC) layer formed over the organic light emitting element and configured to selectively transmit or reflect circularly polarized light and 3) a translucent metal layer formed on the CLC layer and configured to partially transmit and partially reflect incoming light. According to at least one embodiment, the OLED can suppress reflection of external light while minimizing loss of light generated from the organic emission layer.
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Citations
20 Claims
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1. An organic light emitting diode (OLED) display device, comprising:
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a first substrate; an organic light emitting element formed over the first substrate, wherein the organic light emitting element comprise i) first and second electrodes and ii) an organic emission layer interposed between the first and second electrodes; a driving circuit formed over the substrate and configured to drive the organic light emitting element; a cholesteric liquid crystal (CLC) layer formed over the organic light emitting element and configured to selectively transmit or reflect circularly polarized light; a translucent metal layer formed on the CLC layer and configured to partially transmit and partially reflect incoming light; a retardation plate formed on the translucent metal layer and configured to input one of i) linearly polarized light and ii) circularly polarized light, and output the other light; and a polarizing plate formed on the retardation plate and configured to transmit a portion of incoming light that matches a polarizing axis of the polarizing plate, and absorb the remaining incoming light that does not match the polarizing axis thereof. - View Dependent Claims (2, 3, 4)
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5. An organic light emitting diode (OLED) display device, comprising:
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a polarizing plate configured to input external light and output first linearly polarized light; a retardation plate configured to convert the first linearly polarized light into first circularly polarized light; a translucent layer configured to transmit a portion of the first circularly polarized light and reflect the remaining polarized light into a second circularly polarized light toward the retardation plate, wherein the second circularly polarized light is 180 degrees different in phase from the first circularly polarized light; a cholesteric liquid crystal (CLC) layer configured to transmit the portion of the first circularly polarized light; and an electrode configured to reflect the portion of the first circularly polarized light toward the CLC layer, wherein the electrode is formed on an organic emission layer, wherein the retardation plate is further configured to convert the second circularly polarized light into a second linearly polarized light, and wherein the polarizing plate is further configured to absorb the second linearly polarized light. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An organic light emitting diode (OLED) display device, comprising:
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an organic emission layer configured to emit light; an electrode formed on the organic emission layer and configured to transmit the emitted light, wherein the emitted light comprises i) first circularly polarized light and ii) second circularly polarized light which are 180 degrees different in phase from each other; a cholesteric liquid crystal (CLC) layer configured to transmit the first circularly polarized light and reflect the second circularly polarized light into a third circularly polarized light toward the electrode; a translucent layer configured to transmit a portion of the first circularly polarized light output from the CLC layer and reflect the remaining first circularly polarized light toward the CLC layer; a retardation plate configured to convert the portion of the first circularly polarized light output from the CLC layer into first linearly polarized light; and a polarizing plate configured to transmit the first linearly polarized light. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An organic light emitting diode (OLED) display device, comprising:
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a substrate; an organic light emitting element formed over the substrate, wherein the organic light emitting element comprise i) first and second electrodes and ii) an organic emission layer interposed between the first and second electrodes; a cholesteric liquid crystal (CLC) layer formed over the organic light emitting element and configured to selectively transmit or reflect circularly polarized light; means for partially transmitting and partially reflecting incident light; a retardation plate formed on the means and configured to input one of i) linearly polarized light and ii) circularly polarized light, and output the other light; and a polarizing plate formed on the retardation plate and configured to transmit a portion of incoming light that matches a polarizing axis of the polarizing plate, and absorb the remaining incoming light that does not match the polarizing axis thereof. - View Dependent Claims (18, 19)
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20. An organic light emitting diode (OLED) display device, comprising:
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an organic light emitting element configured to emit light; a cholesteric liquid crystal (CLC) layer formed over the organic light emitting element and configured to selectively transmit or reflect circularly polarized light; and a translucent metal layer formed on the CLC layer and configured to partially transmit and partially reflect incoming light.
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Specification