Oled micro-cavity structure and method of making

An organic light emitting diode on a substrate, comprising:

• a first cavity electrode having a first width in a first sub-pixel region of the substrate;
• a first transparent electrode having a second width and positioned on the first cavity electrode, wherein the second width is larger than the first width;
• a first emissive layer in electrical connection with the first transparent electrode;
• and
• a cathode layer on the first emissive layer.

An organic light emitting diode, comprising:

• a substrate;
• an first sub-pixel region, a second sub-pixel region, and a third sub-pixel region on the substrate;
• a first cavity electrode in the first sub-pixel region of the substrate;
• a second cavity electrode in the second sub-pixel region of the substrate;
• a third cavity electrode in the third sub-pixel region of the substrate;
• a first transparent electrode of a first thickness in the first sub-pixel region, the first transparent electrode overlaps beyond a side of the first cavity electrode;
• second transparent electrodes of a second thickness in the first sub-pixel and second sub-pixel regions, the second transparent electrode in the second sub-pixel region overlaps beyond a side of the second cavity electrode;
• third transparent electrodes of a third thickness in the first sub-pixel, second sub-pixel, third sub-pixel regions, the third transparent electrode in the third sub-pixel region overlaps beyond a side of the third cavity electrode;
• an emissive layer being in electrical connection with the first, second and third transparent electrodes;
• and
• a cathode layer on the emissive layer.

A method of making an organic light emitting diode on a substrate, comprising:

• forming a cavity electrode layer across first, second and third micro-cavity regions of the substrate;
• forming a first transparent layer of a first thickness in the first micro-cavity region;
• forming second transparent layers of a second thickness in the first and second micro-cavity regions;
• forming third transparent layers of a third thickness in the first, second and third micro-cavity regions;
• etching the cavity electrode layer such that the first transparent layer in the first micro-cavity region overlaps beyond a first side of a first cavity electrode, the second transparent layer in the second micro-cavity region overlaps beyond a second side of a second cavity electrode, and the third transparent layer in the third micro-cavity region overlaps beyond a third side of a third cavity electrode;
• forming a first bank between the first and second micro-cavity regions and a second bank between the second and third micro-cavity regions;
• forming a first emissive layer in electrical connection with the third transparent layer of the first micro-cavity region;
• forming a second emissive layer in electrical connection with the third transparent layer of the second micro-cavity region;
• forming a third emissive layer in electrical connection with the third transparent layer of the third micro-cavity region;
• and
• forming a cathode layer on the first, second and third emissive layers.

A method of making an organic light emitting diode on a substrate, comprising:

• forming a cavity electrode layer across first, second and third micro-cavity regions of the substrate;
• forming first transparent layers of a first thickness in the first, second and third micro-cavity region;
• forming second transparent layers of a second thickness in the first and second micro-cavity regions;
• forming a third transparent layer of a third thickness in the first micro-cavity regions;
• etching the cavity electrode layer such that the first transparent layer in the first micro-cavity region overlaps beyond a first side of a first cavity electrode, the first transparent layer in the second micro-cavity region overlaps beyond a second side of a second cavity electrode, and the first transparent layer in the third micro-cavity region overlaps beyond a third side of a third cavity electrode;
• forming a first bank between the first and second micro-cavity regions and a second bank between the second and third micro-cavity regions;
• forming a first emissive layer in electrical connection with the third transparent layer of the first micro-cavity region;
• forming a second emissive layer in electrical connection with the second transparent layer of the second micro-cavity region;
• forming a third emissive layer in electrical connection with the first transparent layer of the third micro-cavity region;
• and
• forming a cathode layer on the first, second and third emissive layers.