Organic electroluminescent device
First Claim
1. In an organic electroluminescent device having a substrate, light emitting layers on top of the substrate, the light emitting layers including two electrode layers and an organic electroluminescent material therebetween, and at least one color filter, an improvement comprising:
- creating a transparent protective layer on top of the light emitting layers, such that the light emitting layers lie between the substrate and the transparent protective layer; and
layering the color filter above the transparent protective layer, such that both the light emitting layers and the transparent protective layer lie in between the substrate and the color filter.
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Abstract
A color organic electroluminescent device includes color filters, light emitting layers and substrate integrated into a single assembly, with the light emitting layers lying between the substrate and the color filters. Unlike color electroluminescent devices where an image must be viewed through a transparent substrate, or where color filters are deposited upon another device and later combined with the assembly, the present disclosure calls for a transparent protective layer of silicon nitride or a similar material to be deposited over the light emitting layers to protect the light emitting layers from oxygen and moisture, and to serve as a platform for color filters. In order to achieve sufficient density in the protective layer and avoid defects, a cold plasma deposition or similar process is used for deposition of the protective layer. By viewing light through this protective layer instead of a substrate, nearly any substrate can be used.
66 Citations
19 Claims
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1. In an organic electroluminescent device having a substrate, light emitting layers on top of the substrate, the light emitting layers including two electrode layers and an organic electroluminescent material therebetween, and at least one color filter, an improvement comprising:
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creating a transparent protective layer on top of the light emitting layers, such that the light emitting layers lie between the substrate and the transparent protective layer; and
layering the color filter above the transparent protective layer, such that both the light emitting layers and the transparent protective layer lie in between the substrate and the color filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
forming the device to be an organic electroluminescent device that generates a single color of light;
layering at least two color filters above the protective layer, each of the at least two color filters generating a color component of light from the single color.
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7. An improvement according to claim 6, wherein the single color of light is white light.
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8. An improvement according to claim 1, wherein the substrate is opaque.
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9. An improvement according to claim 8, wherein the opaque substrate comprises internal vias for electrical connection.
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10. An improvement according to claim 1, wherein the protective layer is between five hundred Angstroms and one micron in thickness.
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11. An organic electroluminescent device, comprising:
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a substrate;
a first electrode above the substrate, the first electrode being one of a cathode and an anode;
an organic electroluminescent material layer above the first electrode;
a second, transparent electrode above the organic electroluminescent layer, the second, transparent electrode being the other of the cathode and the anode;
a transparent protective layer above the second, transparent electrode; and
at least one color filter above the protective layer. - View Dependent Claims (12, 13, 14, 15)
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16. A method of creating an organic electroluminescent device, using a substrate, light emitting layers including two electrodes and an organic electroluminescent material, a color filter and a transparent protective layer, said method comprising:
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depositing the light emitting layers above the substrate;
creating the transparent protective layer above the light emitting layers, such that the light emitting layers are between the transparent protective layer and the substrate; and
layering the color filter above the protective layer, such that the light emitting layers and the protective layer are between the color filter and the substrate. - View Dependent Claims (17)
layering the color filter includes placing at least three separate color filters above the protective layer, such that each color filter produces light of a primary color by filtering light from the white light.
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18. A method of creating an organic electroluminescent device, using a substrate, light emitting layers including two electrodes and an organic electroluminescent material, a color filter and a transparent protective layer, said method comprising:
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depositing the light emitting layers above the substrate, creating the transparent protective layer above the light emitting layers, such that the light emitting layers are between the transparent protective layer and the substrate; and
layering the color filter above the protective layer, such that the light emitting layers and the protective layer are between the color filter and the substrate, wherein, creating the transparent protective layer includes depositing the transparent protective layer using a deposition process upon the device including the organic electroluminescent material, but where the device is not heated above one hundred and forty degrees Celsius. - View Dependent Claims (19)
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Specification