Organic light emitting diode display
An organic light emitting diode display has uniform light emission efficiency over the entire pixel area. The organic light emitting diode display comprises: a substrate having a red pixel area, a green pixel area, and a blue pixel area arrayed in a matrix; an anode electrode in the red, green, and blue pixel areas; a hole injection layer including an organic material with an extinction coefficient less than about 0.13 and on the anode electrode covering a whole surface of the substrate; an emission layer on the hole injection layer; an electron injection layer on a whole surface of the emission layer; and a cathode electrode on a whole surface of the electron injection layer.
1. An organic light emitting diode display comprising:
a substrate having a red pixel area, a green pixel area, and a blue pixel area arrayed in a matrix;
an anode electrode in the red, the green, and the blue pixel areas;
a hole injection layer on the anode electrode including an organic material with an extinction coefficient from about 0.05 to about 0.13 and covering a whole surface of the substrate;
an emission layer on the hole injection layer;
an electron injection layer on a whole surface of the emission layer; and
a cathode electrode on a whole surface of the electron injection layer.
2. The device according to the claim 1 , wherein the hole injection layer has a thickness of 50 nm to 100 nm.
3. The device according to the claim 1 , wherein the emission layer includes:
a red emission layer in the red pixel;
a blue emission layer in the blue pixel; and
a green emission layer in the green pixel.
4. The device according to the claim 1 , further comprising:
a red color filter in the red pixel;
a green color filter in the green pixel; and
a blue color filter in the blue pixel, and
wherein the emission layer includes:
a blue organic light emitting layer covering a whole surface of the hole injection layer; and
a green organic light emitting layer disposed on a whole surface of the blue organic light emitting layer.
5. The device according to the claim 4 , wherein the blue organic light emitting layer includes:
a blue hole transport layer on the whole surface of the hole injection layer;
a blue emission layer on a whole surface of the blue hole transport layer;
a blue electron transport layer on a whole surface of the blue emission layer; and
a N-type carrier generating layer on a whole surface of the blue electron transport layer, and
wherein the green organic light emitting layer includes:
a P-type carrier generating layer on a whole surface of the N-type carrier generating layer;
a green hole transport layer on a whole surface of the P-type carrier generating layer;
a green emission layer on a whole surface of the green hole transport layer; and
a green electron transport layer on a whole surface of the green emission layer.
6. An organic light emitting diode display comprising:
a substrate having a red pixel area, a green pixel area, and a blue pixel area arrayed in a matrix;
an anode electrode in the red, the green, and the blue pixel areas;
a hole injection layer on the anode electrode and including an organic material with an extinction coefficient higher than about 0.13 and having a thickness of 2 nm to 15 nm, and covering a whole surface of the substrate;
an emission layer on the hole injection layer;
an electron injection layer on a whole surface of the emission layer; and
a cathode electrode on a whole surface of the electron injection layer.
7. The device according to the claim 6 , wherein the emission layer includes:
a red emission layer in the red pixel;
a blue emission layer in the blue pixel; and
a green emission layer in the green pixel.
8. The device according to the claim 6 , further comprising:
a red color filter in the red pixel;
a green color filter in the green pixel; and
a blue color filter in the blue pixel, and
wherein the emission layer includes:
a blue organic light emitting layer covering a whole surface of the hole injection layer; and
a green organic light emitting layer on a whole surface of the blue organic light emitting layer.
9. The device according to the claim 8 , wherein the blue organic light emitting layer includes:
a blue hole transport layer on the whole surface of the hole injection layer;
a blue emission layer on a whole surface of the blue hole transport layer;
a blue electron transport layer on a whole surface of the blue emission layer; and
a N-type carrier generating layer on a whole surface of the blue electron transport layer, and
wherein the green organic light emitting layer includes:
a P-type carrier generating layer on a whole surface of the N-type carrier generating layer;
a green hole transport layer on a whole surface of the P-type carrier generating layer;
a green emission layer on a whole surface of the green hole transport layer; and
a green electron transport layer on a whole surface of the green emission layer.