OLED device and a method of preparing the same

An OLED device, comprising:

• a substrate;
• a first source electrode on a side of the substrate, the first source electrode having a first side surface intersecting with the substrate at a first angle;
• a first insulating layer on an upper surface of the first source electrode facing away from the substrate, the first insulating layer having a second side surface intersecting with an upper surface of the first source electrode at a second angle, and the second side surface also intersecting with the first side surface of the first source electrode;
• an active layer at a same side of the substrate as the first source electrode and the first insulating layer, the active layer covering the first side surface and the second side surface;
• a gate insulating layer on the active layer;
• an anode on the gate insulating layer;
• a light emitting functional layer on the anode;
• and
• a cathode on the light emitting functional layer, a portion of the cathode at least partially covering the first insulating layer and functioning as a first drain region which is in contact with the active layer,
• wherein at least one of an angle between the first side surface and the upper surface of the substrate and an angle between the second side surface and the upper surface of the substrate is an acute angle;
• and
• wherein the gate insulating layer is spaced apart from and thus in contact with neither the first source electrode nor the first insulating layer by the active layer.