Organic light-emitting display having anti-reflective and inert cathode
View Patent ↗An organic light-emitting display having an anti-reflective and inert cathode is provided. The cathode is made of a diamond-like carbon material to reduce ambient light reflection and increase contrast. The diamond-like carbon material is an opaque and inert material, so the cathode is anti-reflective and inert.
1. An organic light-emitting display having an anti-reflective and inert cathode, comprising:
a substrate;
an anode formed on said substrate;
an organic light-emitting layer formed on said anode; and
an opaque and inert cathode formed on said organic light-emitting layer;
wherein said cathode is made of an anti-reflective hard amorphous carbon material for absorbing ambient light.
2. The organic light-emitting display of claim 1 , further comprising a conductor layer formed on said cathode.
3. The organic light-emitting display of claim 2 , wherein said conductor layer is of aluminum or other highly conductive material.
4. The organic light-emitting display of claim 1 , wherein a thickness of said cathode is 2–300 nm.
5. The organic light-emitting display of claim 1 , wherein a work function of said cathode is smaller than about 4 eV.
6. The organic light-emitting display of claim 1 , wherein said substrate is a passive matrix substrate, an active matrix substrate or a flexible substrate.
7. The organic light-emitting display of claim 1 , wherein the hard amorphous carbon material includes a dopant of N, P, Si, or metal.
8. The organic light-emitting display of claim 1 , wherein the hard amorphous carbon material absorbs ambient light with wavelengths ranging from visible to UV.
9. The organic light-emitting display of claim 1 , wherein the energy gap of the hard amorphous carbon material is 1.7 to 3.1 eV.
10. The organic light-emitting display of claim 1 , wherein the hard amorphous carbon material is black.
11. A top-emitting organic light-emitting display having an anti-reflective and inert cathode, comprising:
a substrate;
an opaque and inert cathode formed on said substrate;
an organic light-emitting layer formed on said cathode; and
an anode formed on said organic light-emitting layer;
wherein said cathode is made of an anti-reflective hard amorphous carbon material for absorbing ambient light.
12. The top-emitting organic light-emitting display of claim 11 , further comprising a conductor layer formed between said substrate and said cathode.
13. The top-emitting organic light-emitting display of claim 12 , wherein said conductor layer is of aluminum or other highly conductive material.
14. The top-emitting organic light-emitting display of claim 11 , wherein a thickness of said cathode is 2–300 nm.
15. The top-emitting organic light-emitting display of claim 11 , wherein a work function of said cathode is smaller than about 4 eV.
16. The top-emitting organic light-emitting display of claim 11 , wherein said substrate is a passive matrix substrate, an active matrix substrate or a flexible substrate.
17. The organic light-emitting display of claim 11 , wherein the hard amorphous carbon material includes a dopant of N, P, Si, or metal.
18. The organic light-emitting display of claim 11 , wherein the hard amorphous carbon material absorbs ambient light with wavelengths ranging from visible to UV.
19. The organic light-emitting display of claim 11 , wherein the energy gap of the hard amorphous carbon material is 1.7 to 3.1 eV.
20. The organic light-emitting display of claim 11 , wherein the hard amorphous carbon material is black.
21. An organic light-emitting display having an anti-reflective and inert cathode, comprising:
a substrate;
an anode formed on said substrate;
an organic light-emitting layer formed on said anode; and
an opaque and inert cathode formed on said organic light-emitting layer;
wherein said cathode is made of an anti-reflective hard amorphous carbon material for absorbing ambient light, wherein the hard amorphous carbon material includes a dopant of N, P, Si, or metal.
22. An organic light-emitting display, comprising:
a substrate;
an anode formed on said substrate;
an organic light-emitting layer formed on said anode; and
an opaque and inert cathode formed on said organic light-emitting layer;
wherein said cathode is made of an anti-reflective hard amorphous carbon material for absorbing ambient light, wherein the hard amorphous carbon material includes a dopant of P, Si, or metal.