Patent ID: 8277273
Filing Date: 2012-10-02
Classification: B41M,B41N,H01L

Abstract:
1. A method of producing a lighting device that comprises an organic electroluminescent element comprising at least an anode, a cathode, and an organic light-emitting layer placed between the cathode and the anode, the method comprising: a process for producing the organic electroluminescent element, the process comprising an organic light-emitting layer formation step for forming an organic light-emitting layer by applying an organic light-emitting ink comprising an organic light-emitting material and a solvent to a light-emitting layer formation region on which the organic light-emitting layer is to be formed, by using a relief printing plate, wherein the relief printing plate has a relief portion, an outline of surface of the relief portion is substantially the same as an outline of the light-emitting layer formation region, an area of the surface of the relief portion is 1 cm×1 cm or more, a plurality of ridges and grooves are formed on the surface of the relief portion configured to be arranged in a strip pattern being parallel to the printing direction of relief printing, at least one longitudinal end of the plurality of grooves opens in a side surface of the relief portion, a width of the ridge is 10 μm to 100 μm, and a width of the groove is 10 μm to 100 μm.