Patent ID: 9564591
Date: 2017-02-07
CPC Classifications: H01L

Claim:
1. A method of producing an organic electroluminescent element having a light-emitting pattern, the organic electroluminescent element comprising one or a plurality of organic functional layers between at least a pair of electrodes, the method comprising a step of: forming the light-emitting pattern by light irradiation to the organic electroluminescent element with changing an amount of the light irradiation based on a tone reproduction curve made in advance which has a highlight portion, a shadow portion and a straight line portion, and the highlight portion and the shadow portion each having a soft gradation section with a smaller slope than a slope of a gradation of the straight line portion to result in forming the light-emitting pattern having a gradation by a light-emitting luminance corresponding to the amount of the light irradiation.