Organic light emitting display (OLED) having a gas vent groove to decrease edge open failures
View Patent ↗An Organic Light Emitting Display (OLED) and its fabrication method has a pixel defining layer provided on a first electrode which is formed with a gas vent groove to allow gas to vent when the pixel defining layer is being formed, so that gas is not left in a pixel but vented when a donor film is laminated by a Laser-Induced Thermal Imaging (LITI) method, thereby decreasing edge open failures.
1. An Organic Light Emitting Display (OLED), comprising:
a first electrode arranged on a substrate;
a pixel defining layer having at least one gas vent groove, the pixel defining layer being arranged on the first electrode;
an organic layer, separate from the pixel defining layer and dividing the pixel defining layer, and including at least an emission layer arranged on an exposed first electrode region; and
a second electrode arranged on the organic layer,
wherein said at least one gas vent groove is not filled up by the organic layer; and
wherein gas condensed in the organic layer is vented by said at least one gas vent groove.
2. The OLED according to claim 1 , wherein the first electrode comprises a transparent electrode including one material selected from a group consisting of Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO) and In 2 O 3 .
3. The OLED according to claim 1 , wherein the pixel defining layer comprises one of an organic insulating layer and an inorganic insulating layer.
4. The OLED according to claim 1 , wherein said at least one gas vent groove of the pixel defining layer is arranged in a pixel edge region.
5. The OLED according to claim 4 , wherein said at least one gas vent groove arranged in the pixel edge region has a depth of 1 μm through a cross-sectional thickness of the pixel defining layer.
6. The OLED according to claim 4 , wherein said at least one gas vent groove arranged in the pixel edge region is connected to adjacent pixels.
7. The OLED according to claim 4 , wherein said at least one gas vent groove has a width within 30% of at least one of an entire horizontal or vertical length of the pixel region.
8. The OLED according to claim 1 , further comprising a thin film transistor arranged on the substrate.
9. The OLED according to claim 1 , wherein the second electrode comprises one of a transparent electrode and a semi-transparent electrode including one material selected from a group consisting of Ca, Mg, MgAg, Ag, an Ag alloy, Al and an Al alloy.
10. The OLED according to claim 1 , wherein said at least one gas vent groove comprises a gas vent groove extending parallel to a transfer direction of the OLED.
11. The OLED according to claim 10 , wherein said at least one gas vent groove further comprises a gas vent groove extending perpendicular to a transfer direction of the OLED.
12. The OLED according to claim 11 , wherein said at least one gas vent groove further comprises a gas vent groove extending at a diagonal relative to a transfer direction of the OLED.
13. The OLED according to claim 10 , wherein said at least one gas vent groove further comprises a gas vent groove extending at a diagonal relative to a transfer direction of the OLED.
14. The OLED according to claim 1 , wherein said at least one gas vent groove comprises a gas vent groove extending at a diagonal relative to a transfer direction of the OLED.