Organic light emitting device with increased luminescence
First Claim
1. An organic light emitting device comprising:
- a substrate;
a first signal line formed on the substrate;
a second signal line formed perpendicularly to the first signal line;
a plurality of thin film transistors formed on the substrate and electrically connected to the first and second signal lines;
a second passivation layer formed on the thin film transistors and having a concavo-convex surfacea first passivation layer formed on the second passivation layer and having a concavo-convex surface;
a first electrode formed on the first passivation layer and having a concavo-convex surface;
a partition formed on the first electrode and having an opening extending to the first electrode;
a light emitting member formed on the first electrode and in the opening; and
a second electrode formed on the light emitting member,wherein refractive indices of the light emitting member and the first passivation layer are different, and refractive indices of the first passivation layer and the first electrode are different,wherein at least one of a difference between the refractive indices of light emitting member and the first passivation layer and a difference between the refractive indices of the first passivation layer and the first electrode is 0.2 or greater,wherein the first electrode has a concavo-convex surface, andwherein a ratio of height to a bottom length of the concave portion or the convex portion is between about 0.1 and about 1, andwherein the second passivation layer comprises a polycarbonate-based compound containing silicon nitride or a high refractive index additive.
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Accused Products
Abstract
An organic light emitting device (OLED) is presented that includes: signal lines formed on a substrate; thin film transistors formed on the substrate and electrically connected to the signal lines; a first passivation layer having a concavo-convex surface; a first electrode formed on the first passivation layer; a partition formed on the first electrode and having an opening extending to the first electrode; a light emitting member formed in the opening and covered by a second electrode. The refractive indices of the light emitting member and the first passivation layer are different, and the refractive indices of the first passivation layer and the first electrode are different. The concavo-convex surface increases the luminescent surface area without decreasing the opening size, thereby enhancing the luminous power per unit pixel electrode. Forming an interface of materials whose refractive indices differ by at least 0.2 within the OLED increases light extraction efficiency.
30 Citations
19 Claims
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1. An organic light emitting device comprising:
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a substrate; a first signal line formed on the substrate; a second signal line formed perpendicularly to the first signal line; a plurality of thin film transistors formed on the substrate and electrically connected to the first and second signal lines; a second passivation layer formed on the thin film transistors and having a concavo-convex surface a first passivation layer formed on the second passivation layer and having a concavo-convex surface; a first electrode formed on the first passivation layer and having a concavo-convex surface; a partition formed on the first electrode and having an opening extending to the first electrode; a light emitting member formed on the first electrode and in the opening; and a second electrode formed on the light emitting member, wherein refractive indices of the light emitting member and the first passivation layer are different, and refractive indices of the first passivation layer and the first electrode are different, wherein at least one of a difference between the refractive indices of light emitting member and the first passivation layer and a difference between the refractive indices of the first passivation layer and the first electrode is 0.2 or greater, wherein the first electrode has a concavo-convex surface, and wherein a ratio of height to a bottom length of the concave portion or the convex portion is between about 0.1 and about 1, and wherein the second passivation layer comprises a polycarbonate-based compound containing silicon nitride or a high refractive index additive. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An organic light emitting device comprising:
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a substrate; a first signal line formed on the substrate; a second signal line formed perpendicularly to the first signal line; a plurality of thin film transistors formed on the substrate and electrically connected to the first and second signal lines; a first passivation layer formed on the thin film transistors and having a concavo-convex surface; a first electrode formed on the first passivation layer and having a concavo-convex surface; a partition formed on the first electrode and having an opening extending to the first electrode; a light emitting member formed on the first electrode and disposed in the opening; a second electrode formed on the light emitting member; and a second passivation layer between the substrate and the first electrode and having a concavo-convex surface; wherein a ratio of height to bottom length of the concave portion or the convex portion of the first passivation layer is between about 0.1 and about 1, wherein a difference between a refractive index of the second passivation layer and that of the first passivation layer is 0.2 or greater, and wherein the second passivation comprises a polycarbonate-based compound containing silicon nitride or a high refractive index additive. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for manufacturing an organic light emitting device, comprising:
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forming a plurality of signal lines and a plurality of thin film transistors on a substrate; forming a second passivation layer with a concavo-convex surface on the signal lines and the thin film transistors; forming a first passivation layer with a concavo-convex surface on the second passivation layer; forming a first electrode on the first passivation layer; forming a partition on the first electrode and having an opening extending to the first electrode; forming a light emitting member on the first electrode in the opening; and forming a second electrode on the light emitting member; wherein at least one of a difference between the refractive indices of light emitting member and the first passivation layer and a difference between the refractive indices of the first passivation layer and the first electrode is 0.2 or greater, wherein the concavo-convex shape of the surface of the first passivation layer is formed at a portion corresponding to the opening, wherein a ratio of height to bottom length of the concave portion or the convex portion of the first passivation layer is between about 0.1 and about 1, and wherein the second passivation layer comprises a polycarbonate-based compound containing silicon nitride or a high refractive index additive. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification