Method for making organic light emitting diode array

A method of making organic light emitting diode array, the method comprising:

• providing a base defining a plurality of convexities, wherein the base comprises a substrate;
• a plurality of thin-film transistors, located on a surface of the substrate and arranged to form an array;
• and a first insulative layer, located on a surface of the plurality of thin-film transistors and defining the plurality of convexities;
• forming a plurality of first electrodes on the plurality of convexities, wherein the forming the plurality of first electrodes on the plurality of convexities comprises:
• exposing part of each of the plurality of thin-film transistors by etching the base from the first insulative layer;
• depositing a continuous conductive layer to cover the plurality of convexities and electrically connect to the plurality of thin-film transistors;
• patterning the continuous conductive layer to obtain the plurality of first electrodes spaced from each other, wherein each of the plurality of first electrodes is located at least on top surface and side surface of one of the plurality of convexities to form a protrudent surface;
• and the plurality of first electrodes corresponds to and electrically connected to the plurality of thin-film transistors in a one-to-one manner;
• and
• applying a patterned third insulative layer to cover first parts of the plurality of first electrodes between the plurality of convexities and expose second parts of the plurality of first electrodes on top surfaces of the plurality of convexities so that the second parts of the plurality of first electrodes extend out of the patterned third insulative layer;
• applying a plurality of organic light emitting layers on the plurality of first electrodes comprising transfer printing at least a plurality of electroluminescent layers on the plurality of first electrodes, wherein the transfer printing at least the plurality of electroluminescent layers on the plurality of first electrodes comprises:
• applying an organic electroluminescent film on a surface of a template, wherein a wetting layer is applied on the surface of the template before applying the organic electroluminescent film;
• contacting the plurality of first electrodes with the organic electroluminescent film;
• and
• separating the plurality of first electrodes from the template;
• making a patterned second insulative layer to cover the plurality of first electrodes and expose the plurality of organic light emitting layers;
• and
• electrically connecting at least one second electrode to the plurality of organic light emitting layers.