Organic light emitting display device comprising auxiliary electrode having void therein and manufacturing method thereof
AssigneeLG Display Co., Ltd.
InventorsJongHyeok Im, SeJune Kim, JoonSuk Lee, SoJung Lee, JaeSung Lee
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Abstract
Provided are an organic light emitting display device and a manufacturing method thereof. In the organic light emitting display device, after an auxiliary electrode having a multilayer structure including different kinds of metals different in etching speed is formed, a void is formed within the auxiliary electrode upon formation of an anode. The resulting structure is created by a simplified process, with contact reliability between a cathode and the auxiliary electrode being enhanced, while resistance of the cathode is reduced.
Claims15
An organic light emitting display device comprising:
- a first electrode disposed in each of a plurality of subpixels of a substrate;
- a driving thin film transistor (TFT) and a connection electrode disposed below the first electrode, the connection electrode to connect the first electrode to a drain electrode of the driving TFT;
- an auxiliary electrode spaced apart from the first electrode and having a void formed by at least upper, lower, and lowermost layers having different etching speeds from each other;
- a bank surrounding a periphery of the first electrode and exposing a portion of the auxiliary electrode;
- and
- a second electrode in direct contact with the auxiliary electrode at the void,
- wherein the lower and lowermost layers have different etching speeds from that of the first electrode, and
- wherein differences in protruding amounts among end portions of the upper, lower, and lowermost layers result in the void due to the different etching speeds.
An organic light emitting display device comprising:
- a first electrode disposed in each of a plurality of subpixels of a substrate;
- an auxiliary electrode spaced apart from the first electrode and including at least two layers, wherein an end portion of at least one layer below an uppermost layer of the at least two layers is receded relative to an end portion of the uppermost layer to form a void;
- an organic layer on the first electrode and the upper layer;
- a second electrode on the organic layer and connected to the at least one layer;
- and
- a connection electrode formed below the first electrode and made of same materials as two lowest metal layers of the at least two metal layers, wherein the connection electrode is in direct contact with a lower surface of the first electrode.
A method for manufacturing an organic light emitting display device, the method comprising:
- forming a driving thin film transistor (TFT) on a substrate;
- forming a connection electrode and an auxiliary electrode pattern including at least two different metal layers on the substrate;
- patterning a first electrode on the substrate with the connection electrode and the auxiliary electrode pattern formed thereon, wherein the auxiliary electrode pattern is etched to form the auxiliary electrode including the at least two different metal layers;
- forming a bank surrounding a periphery of the first electrode and exposing a portion of the auxiliary electrode;
- forming an organic layer on the first electrode, the auxiliary electrode, and the bank;
- forming a second electrode on the organic layer,
- wherein an end portion of at least one metal layer formed on a lowermost layer of the at least two metal layers is receded relative to an end portion of the uppermost layer of the at least two metal layers to form a void, and
- wherein the second electrode and the auxiliary electrode are in direct contact with each other through the void.
Dependencies are inferred from the claim text.