OLED display with photosensor
View Patent ↗An OLED display including: a transparent electrode; a reflective electrode having a transparent window; a light emissive layer disposed between the transparent electrode and the reflective electrode; and a photosensor located under the transparent window of the reflective electrode to sense light produced by the light emissive layer.
1. An OLED display, comprising:
a) a transparent electrode;
b) a reflective electrode having a transparent window;
c) a light emissive layer disposed between the transparent electrode and the reflective electrode; and
d) a photosensor located under the transparent window of the reflective electrode to sense light produced by the light emissive layer.
2. The display claimed in claim 1 , wherein the transparent window is an opening in the reflective electrode.
3. The display claimed in claim 2 , wherein the opening is filled with a transparent insulator.
4. The display claimed in claim 3 , wherein the transparent insulator is SiO 2 .
5. The display claimed in claim 2 , wherein the opening is filled with transparent conductor.
6. The display claimed in claim 5 , wherein the transparent conductor is ITO.
7. The display claimed in claim 1 , wherein the transparent window is a thin region in the reflective electrode.
8. The display claimed in claim 1 , wherein the photosensor is a thin film device.
9. The display claimed in claim 1 , wherein the window is located in the center of the reflective electrode.
10. The display claimed in claim 1 , wherein the window is located at an edge of the reflective electrode.
11. The display claimed in claim 1 , wherein the reflective electrode includes a plurality of windows.
12. The display claimed in claim 11 , further comprising a plurality of photosensors corresponding to the plurality of windows.
13. A method of making an OLED display, comprising the steps of:
a) providing a substrate;
b) forming a control circuit, including a photosensor on the substrate;
c) forming a reflective electrode having a transparent window located over the photosensor;
d) depositing a light emissive layer over the reflective electrode; and
e) forming a transparent electrode over the light emissive layer.
14. The method claimed in claim 13 , wherein the transparent window is an opening in the reflective electrode.
15. The method claimed in claim 14 , further comprising the step of providing a transparent insulator in the opening.
16. The method claimed in claim 15 , wherein the transparent insulator is SiO 2 .
17. The method claimed in claim 14 , further comprising the step of providing a transparent conductor in the opening.
18. The method claimed in claim 17 , wherein the transparent conductor is ITO.
19. The method claimed in claim 13 , wherein the transparent window is a thin region in the reflective electrode.
20. The method claimed in claim 13 , wherein the step of forming the photosensor employs a thin film manufacturing technique.
21. The method claimed in claim 13 , wherein the window is located in the center of the reflective electrode.
22. The method claimed in claim 13 , wherein the window is located at an edge of the reflective electrode.
23. The method claimed in claim 13 , wherein the reflective electrode includes a plurality of windows.
24. The method claimed in claim 23 , wherein the step of forming a photosensor includes forming a plurality of photosensors corresponding to the plurality of windows in the reflective electrode.
25. The method claimed in claim 14 , wherein the display includes a plurality of light emitting elements defined by a plurality of separate reflective electrodes having openings, and further comprising the step of forming an insulator between the reflective electrodes and in the openings in the reflective electrodes.