Organic EL display device and its manufacture

Abstract

The present invention relates to an organic electro-luminescent display apparatus, which is a full-color organic EL display unit, wherein localized defective resistance and disconnection of a second electrode formed on an organic layer are eliminated. The organic electro-luminescent display apparatus has a hole injection layer and a hole transport layer formed on the surface of the first electrodes and insulation layers covering across a plurality of first electrodes. Fields for each color are selected and luminous layers, electron transport layers, electron injection layers are formed in each field. An organic layer composed of the hole injection layer, the hole transport layer, the luminous layer, the electron transport layer and of the electron injection layer forms a continuous layer connecting the fields selected for each color. The thickness of the organic layer for each color is made different for the purpose of adjusting luminous efficiency, which forms unevenness on the surface of the organic layer. The layer thickness of a second electrode, however, is configured to be bigger than the maximum value of the addition of the thickness of the luminous layer and that of the electron transport layer.

Description

technical field [0001] The present invention relates to an organic EL (Electroluminescence) display and a manufacturing method thereof, and more particularly, the present invention relates to an organic EL display having a structure for performing full-color display and a manufacturing method thereof. Background technique [0002] An organic EL display uses an organic EL element as a basic component, and displays an image by turning on or off the organic EL element formed on a flat substrate. An organic EL element refers to the arrangement of electrodes with a specified area facing each other, one of which is used as an anode for applying a positive voltage, and the other is used as a cathode for applying a negative voltage, and an organic layer having a light-emitting layer formed of an organic light-emitting material is arranged between the electrodes. , which is a surface emitting component that injects electrons from the cathode and holes from the anode into the light-em...

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Problems solved by technology

[0011] That is, in the existing organic EL display that performs full-color display, when the surface of the organic layer forming the second electrode is formed flat, there is a problem that, in the light-emitting layers of each color, The difference in luminous efficiency makes it difficult to obtain the required color balance and contrast. In order to eliminate this problem, when there is a difference in film thickness between the light-emitting layers of various colors or the electron transport layer, the first layer formed on the organic layer 2. If the film thickness of the electrode is locally thinned, there will be disadvantageous situations such as display defects and pixel defects, and thus, high-quality images cannot be sufficiently displayed.

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