Method for fabricating organic electro-luminance device
View Patent ↗Provided is a method for fabricating an organic EL device that can prevent delamination of an electrode. The method includes: forming electrode separators on a substrate, the electrode separators being spaced apart by a constant distance from one another; and depositing an electrode material on an entire surface of the substrate including the electrode separators to form an electrode separated by the electrode separators. According to the present invention, since the anode is automatically separated in the unit of pixels due to the existence of the electrode separator, delamination of the anode can be prevented, and further product reliability can be enhanced. Also, since a complicated photolithography process is not needed, process efficiency can be enhanced.
1. A method for fabricating an organic EL device, the method comprising:
forming a TFT in the unit of pixel on a substrate;
forming a first insulating layer on an entire surface of the substrate including the TFT;
forming a via-hole penetrating the first insulating layer;
forming an electrode separator on a predetermined portion of the first insulating layer so as to separate anodes from each other in the unit of pixel, wherein the electrode separator is formed in a shape that an upper width is larger than a lower width at a boundary between the pixels;
depositing an anode material on an entire surface of the first insulating layer including the via-hole and the electrode separator, such that the anodes are automatically separated from each other by the electrode separator, wherein each of the anodes is formed in the unit of pixel and is connected with the thin film transistor through the via-hole in the unit of pixel;
forming a second insulating layer at a portion except for an emission area of the each pixel on the anode and electrode separator, wherein the second insulating layer covers the electrode separator and the anode material on the electrode separator; and
sequentially depositing an organic EL layer and a cathode on the anode including the second insulating layer, wherein the anode is below the organic EL layer and the cathode is on the organic EL layer.
2. The method of claim 1 , wherein the electrode separator is shaped in a reverse trapezoid.
3. The method of claim 1 , wherein the electrode separator comprises at least two layers.
4. The method of claim 1 , wherein the electrode separator is made of at least one selected from the group consisting of organic material, inorganic material, and a mixture of them.
5. The method of claim 1 , wherein the forming the electrode separator comprises at least one of a negative photoresist process and an etch process.