1. Field
The present disclosure relates to an organic light emitting display device and a manufacturing method thereof, and more particularly, to an organic light emitting display device with improved stability of a light emission layer and a manufacturing method thereof.
2. Description of the Related Technology
An organic light emitting display device may include a self-emission display device including an organic light emitting diode that emits light to display an image. Since the organic light emitting display device has characteristics such as low power consumption, high luminance, and a high response speed, the organic light emitting display device currently receives attention as a display device.
In general, the organic light emitting display device includes a hole injection electrode, a light emission layer, and an electron injection electrode. In the organic light emitting display device, a hole supplied from the hole injection electrode and an electron supplied from the electron injection electrode are coupled with each other in the light emission layer to form an exciton, and light is generated by energy generated when the exciton falls in the ground state.
In the manufacture of an organic light emitting display device, a method of forming the light emission layer may include, for example, a deposition method, a transfer method, and the like.
The transfer method is a method of forming the light emission layer by transferring a light emitting material coated on a donor film to a portion formed for the light emission layer of the organic light emitting display device. For example, a donor film may be disposed over the organic light emitting display device which is a transfer target, heat and the like are selectively applied to the donor film, a light emission material coated on the donor film may be transferred to the corresponding portion of the organic light emitting display device, and then the donor film may be removed to perform transfer only at the corresponding portion, thereby forming the light emission layer.
However, the transfer method includes stripping of the light emission material at an end of the light emission layer portion when removing the donor film, and as a result, an edge of the light emission layer portion may become rough, a protrusion may be generated, or a void may be generated. Electrodes and the like may be disposed on the light emission layer, and a shape of the stripped trace or the protrusion of the light emission layer influences the structure of the electrode, and as a result, the surface of the electrode and the like may become non-uniform. Resultantly, a crack may be generated in the thin film sealing layer and a thin film sealing layer material may not be coated well when the thin film sealing layer is formed on the electrode.
Deterioration in quality of the organic light emitting display device may be generated when the uneven surface is not modified.