Organic electroluminescent display device and method of repairing a defective pixel of the device
View Patent ↗The present invention provides an organic electroluminescent display device and a method of repairing a defective pixel of an organic electroluminescent display device which can realize the repairing a defective pixel to a light emitting pixel by electrically separating a leak portion which generates a defective pixel. To be more specific, a peeling suppression layer is formed between an anode and an organic light emitting layer formed on a main substrate, and a cavity is formed between the main substrate and the peeling suppression layer due to the evaporation generated by an absorption of laser beams thus electrically separating a defective portion so as to repair a black-dot defective pixel to form a light emitting pixel.
1. An organic electroluminescent display device which includes a plurality of organic light emitting elements which form pixels in the inside of a main surface of a light transmitting substrate which is hermetically sealed to an insulating substrate in a state that the light transmitting substrate faces the insulating substrate in an opposed manner with a sealing material interposed between peripheral portions of the substrates, and in which each organic light emitting element includes a plurality of first electrodes which are formed on the main surface of the light transmitting substrate, organic light emitting layers which are formed in a state that the organic light emitting layers cover the plurality of first electrodes and have a light emitting function, and a second electrode which is formed in common over the plurality of organic light emitting elements, wherein
a thermal expansion layer is provided between the first electrode and the organic light emitting layer,
a thermal expansion ratio of the first electrode is different from a thermal expansion ratio of the thermal expansion layer, and
a cavity portion is between peeled thermal expansion layer and the first electrode, wherein the cavity portion is formed by peeling of the thermal expansion layer in response to the difference between the thermal expansion ratios of the thermal expansion layer and the first electrode.
2. An organic electroluminescent display device according to claim 1 , wherein a film thickness of the first electrode is set to a value which falls within a range of 50 to 200 nm.
3. An organic electroluminescent display device according to claim 1 , wherein a sealing film is formed on an upper surface of the second electrode.