Display device and method for manufacturing display device
View Patent ↗A display device and a method for manufacturing the display device are provided. The display device includes an organic layer on an auxiliary wiring is removed with high precision by one operation and, thereby, the yield and the productivity are improved. A lower electrode is formed by patterning in each pixel on a substrate. An auxiliary wiring including a light absorption layer is formed between individual pixels. An organic layer is formed on the substrate while covering the lower electrodes. Laser irradiation is conducted from the organic layer side, the laser light is converted to heat in the light absorption layer exposed at a portion under the organic layer, and the organic layer portion above the light absorption layer is removed selectively. An upper electrode is formed on the organic layer and is connected to the light absorption layer portion of the auxiliary wiring.
1. A method for manufacturing a display device comprising:
forming on a substrate a plurality of organic electroluminescent elements, each organic electroluminescent element including an organic layer held between a lower electrode and an upper electrode;
forming a plurality of the lower electrodes by patterning a plurality of pixels on the substrate;
forming an auxiliary wiring between individual pixels on the substrate, the auxiliary wiring including an electrically conductive layer composed of a same material as the lower electrodes, and a light absorption layer formed on the electrically conductive layer and composed of an electrically conductive material different from the material of the lower electrodes and having a light absorption coefficient higher than a light absorption coefficient of the lower electrode;
forming the organic layer on the substrate including the lower electrodes and the auxiliary wiring, while the organic layer covers at least the lower electrodes;
conducting laser irradiation above the organic layer, converting the laser irradiation to heat in the light absorption layer exposed at a portion under the organic layer, and selectively removing a portion of the organic layer above the light absorption layer; and
forming the upper electrode on the substrate by holding the organic layer between the lower electrodes and the upper electrode and connecting the upper electrode to a portion of the light absorption layer of the auxiliary wiring from which the organic layer has been removed.
2. The method for manufacturing a display device according to claim 1 , wherein the laser irradiation is applied over the entire surface of the substrate.
3. The method for manufacturing a display device according to claim 1 , wherein
the electrically conductive layer is formed from a material having an electrical conductivity higher than the electrical conductivity of the light absorption layer, and
wherein the electrically conductive layer is formed simultaneously with the formation of the lower electrode.