Light emitting device
View Patent ↗An object of the present invention is to provide a light emitting device in which variations in an emission spectrum depending on a viewing angle with respect to a side from which luminescence is extracted are decreased. A light emitting device according to the invention has a transistor, an insulating layer covering the transistor and a light emitting element provided in an opening of the insulating layer. The transistor and the light emitting element are electronically connected through a connecting portion. Additionally, the connecting portion is connected to the transistor through a contact hole penetrating the insulating layer. Note that the insulating layer may be a single layer or a multilayer in which a plurality of layers including different substances is laminated.
1. A light emitting device comprising:
a first insulating layer;
a second insulating layer formed on the first insulating layer;
a transistor formed on the second insulating layer;
a third insulating layer covering the transistor;
a first opening formed in the third insulating layer;
a first electrode covering the first opening and the third insulating layer so as to be in contact with the first insulating layer;
a bank layer covering the third insulating layer and the first electrode, wherein the bank layer has a second opening so as to expose the first electrode;
a light emitting layer formed over the first electrode which is exposed in the second opening; and
a second electrode formed over the light emitting layer.
2. The light emitting device according to claim 1 , wherein the transistor is electrically connected to the first electrode through a connecting portion provided so as to penetrate the third insulating layer.
3. A laptop personal computer having the light emitting device according to claim 1 .
4. A television receiver having the light emitting device according to claim 1 .
5. A light emitting device comprising:
a first insulating layer;
a second insulating layer formed on the first insulating layer;
a transistor formed on the second insulating layer;
a third insulating layer covering the transistor;
a first opening formed in the third insulating layer;
a first electrode covering the first opening and the third insulating layer so as to be in contact with the first insulating layer;
a bank layer covering the third insulating layer and the first electrode, wherein the bank layer has a second opening so as to expose the first electrode;
a light emitting layer formed over the first electrode which is exposed in the second opening; and
a second electrode formed over the light emitting layer,
wherein the bank layer has a shape in which a radius of curvature varies continuously in an edge.
6. The light emitting device according to claim 5 , wherein the transistor is electrically connected to the first electrode through a connecting portion provided so as to penetrate the third insulating layer.
7. A laptop personal computer having the light emitting device according to claim 5 .
8. A television receiver having the light emitting device according to claim 5 .
9. A light emitting device comprising:
a substrate;
a first insulating film formed over the substrate;
a transistor formed over the first insulating film;
a second insulating layer covering the transistor;
a first opening formed in the second insulating layer;
a first electrode covering the first opening and the second insulating layer so as to be in contact with the first insulating layer;
a bank layer covering the second insulating layer and the first electrode, wherein the bank layer has a second opening so as to expose the first electrode;
a light emitting layer formed over the first electrode which is exposed in the second opening; and
a second electrode formed over the light emitting layer,
wherein the first insulating layer prevents the diffusion of impurities and has a refractive index which is smaller than that of the first electrode and a refractive index which is larger than that of the substrate.
10. The light emitting device according to claim 9 , wherein the transistor is electrically connected to the first electrode through a connecting portion provided so as to penetrate the second insulating layer.
11. The light emitting device according to claim 9 , wherein the first electrode includes a conductive substance having light-transmitting properties.
12. A laptop personal computer having the light emitting device according to claim 11 .
13. A television receiver having the light emitting device according to claim 11 .
14. A laptop personal computer having the light emitting device according to claim 9 .
15. A television receiver having the light emitting device according to claim 9 .
16. A light emitting device comprising:
a first insulating layer;
a second insulating layer formed on the first insulating layer;
a transistor formed on the second insulating layer, wherein the transistor includes a channel region between a source region and a drain region, and a gate insulating film between the channel region and a gate electrode;
a third insulating layer covering the transistor;
a first opening formed in the third insulating layer;
a first electrode formed in the first opening so as to be in contact with the first insulating layer;
a bank layer covering the second insulating layer;
a second opening formed in the bank layer;
a light emitting layer being in contact with the first electrode which is exposed in the second opening; and
a second electrode formed over the light emitting layer.
17. The light emitting device according to claim 16 , wherein the transistor is electrically connected to the first electrode through a connecting portion provided so as to penetrate the third insulating layer.
18. The light emitting device according to claim 16 , wherein the first electrode includes a conductive substance having light-transmitting properties.
19. A light emitting device comprising:
a substrate;
a first insulating layer formed on the substrate;
a second insulating layer formed on the first insulating layer;
a transistor formed on the second insulating layer, wherein the transistor includes a channel region between a source region and a drain region, and a gate insulating film between the channel region and a gate electrode;
a third insulating layer covering the transistor;
a first opening formed in the third insulating layer;
a first electrode formed in the first opening so as to be in contact with the first insulating layer;
a bank layer having covering the second insulating layer;
a second opening formed in the bank layer;
a light emitting layer being in contact with the first electrode which is exposed in the second opening; and
a second electrode provided over the light emitting layer.
20. The light emitting device according to claim 19 , wherein the transistor is electrically connected to the first electrode through a connecting portion provided so as to penetrate the third insulating layer.
21. The light emitting device according to claim 19 , wherein the first electrode includes a conductive substance having light transmitting properties.
22. The light emitting device according to claim 19 , wherein the substrate has a smaller refractive index than that of the first insulating layer, and wherein the first insulating layer has a smaller refractive index than that of the first electrode.
23. A laptop personal computer having the light emitting device according to claim 19 .
24. A television receiver having the light emitting device according to claim 19 .
25. A light emitting device comprising:
a substrate;
a first insulating layer formed on the substrate;
a second insulating layer formed on the first insulating layer;
a transistor formed on the second insulating layer, wherein the transistor includes a semiconductor layer including a channel region between a source region and a drain region, and a gate insulating film between the channel region and a gate electrode;
a third insulating layer covering the transistor;
a first opening formed in the third insulating layer;
a first electrode formed in the first opening so as to he in contact with the first insulating layer;
a bank layer covering the second insulating layer;
a second opening formed in the bank layer;
a light emitting layer being in contact with the first electrode exposed in the second opening; and
a second electrode formed over the light emitting layer.
26. The light emitting device according to claim 25 , wherein the first electrode is electrically connected to the semiconductor layer through a connecting portion provided so as to penetrate the third insulating layer.
27. The light emitting device according to claim 25 , wherein the first electrode includes a conductive substance having light transmitting properties.
28. The light emitting device according to claim 25 , wherein the substrate has a smaller refractive index than that of the first insulating layer, and wherein the first insulating layer has a smaller refractive index than that of the first electrode.
29. A laptop personal computer having the light emitting device according to claim 25 .
30. A television receiver having the light emitting device according to claim 25 .
31. A light emitting device comprising:
a substrate;
a first insulating film formed over the substrate;
a transistor formed over the first insulating film;
a second insulating layer covering the transistor;
a first opening formed in the second insulating layer;
a first electrode covering the first opening and the second insulating layer so as to be in contact with the first insulating layer;
a bank layer covering the second insulating layer and the first electrode, wherein the bank layer has a second opening so as to expose the first electrode;
a light emitting layer formed over the first electrode which is exposed in the second opening; and
a second electrode formed over the light emitting layer.
32. The light emitting device according to claim 31 , wherein the transistor is electrically connected to the first electrode through a connecting portion provided so as to penetrate the second insulating layer.
33. The light emitting device according to claim 31 , wherein the first electrode includes a conductive substance having light transmitting properties.
34. The light emitting device according to claim 31 , wherein the substrate has a smaller refractive index than that of the first insulating layer, and wherein the first insulating layer has a smaller refractive index than that of the first electrode.
35. A light emitting device comprising:
a substrate;
a first insulating film formed over the substrate;
a transistor formed over the first insulating film;
a second insulating layer covering the transistor;
a first opening and a second opening formed in the second insulating layer;
a wiring connected to the transistor through the first opening;
a first electrode connected to the wiring, wherein the first electrode is in contact with the first insulating layer in the second opening;
a bank layer covering the second insulating layer and the first electrode, wherein the bank layer has a third opening so as to expose the first electrode;
a light emitting layer formed over the first electrode which is exposed in the third opening; and
a second electrode formed over the light emitting layer.
36. The light emitting device according to claim 35 , wherein the first electrode includes a conductive substance having light transmitting properties.
37. The light emitting device according to claim 35 , wherein the substrate has a smaller refractive index than that of the first insulating layer, and wherein the first insulating layer has a smaller refractive index than that of the first electrode.