Area sensor and display apparatus provided with an area sensor
View Patent ↗An area sensor of the present invention has a function of displaying an image in a sensor portion by using light-emitting elements and a reading function using photoelectric conversion devices. Therefore, an image read in the sensor portion can be displayed thereon without separately providing an electronic display on the area sensor. Furthermore, a photoelectric conversion layer of a photodiode according to the present invention is made of an amorphous silicon film and an N-type semiconductor layer and a P-type semiconductor layer are made of a polycrystalline silicon film. The amorphous silicon film is formed to be thicker than the polycrystalline silicon film. As a result, the photodiode according to the present invention can receive more light.
1. An area sensor comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element and a plurality of thin film transistors,
wherein:
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer and an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
2. An area sensor according to claim 1 , wherein the N-type semiconductor layer comprises polysilicon.
3. An area sensor according to claim 1 , wherein the P-type semiconductor layer comprises polysilicon.
4. An area sensor according to claim 1 , wherein the photoelectric conversion layer comprises amorphous silicon.
5. An area sensor according to claim 1 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
6. An area sensor according to claim 1 , wherein the area sensor is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.
7. An area sensor comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element and a plurality of thin film transistors,
wherein:
light emitted from the electroluminescence element is reflected from a subject to be radiated to the photodiode,
the photodiode generates an image signal from the light reflected to the photodiode,
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
8. An area sensor according to claim 7 , wherein the N-type semiconductor layer comprises polysilicon.
9. An area sensor according to claim 7 , wherein the P-type semiconductor layer comprises polysilicon.
10. An area sensor according to claim 7 , wherein the photoelectric conversion layer comprises amorphous silicon.
11. An area sensor according to claim 7 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
12. An area sensor according to claim 7 , wherein the area sensor is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.
13. An area sensor comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element and a plurality of thin film transistors,
wherein:
the plurality of thin film transistors control light emission of the electroluminescence element,
light emitted from the electroluminescence element is reflected from a subject to be radiated to the photodiode,
the photodiode and the plurality of thin film transistors generate an image signal from the light reflected to the photodiode,
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer and an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
14. An area sensor according to claim 13 , wherein the N-type semiconductor layer comprises polysilicon.
15. An area sensor according to claim 13 , wherein the P-type semiconductor layer comprises polysilicon.
16. An area sensor according to claim 13 , wherein the photoelectric conversion layer comprises amorphous silicon.
17. An area sensor according to claim 13 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
18. An area sensor according to claim 13 , wherein the area sensor is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.
19. An area sensor comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element, a switching TFT, an electroluminescence driving TFT, a reset TFT, a buffer TFT and a selective TFT, wherein:
the switching TET and the electroluminescence driving TFT control light emission of the electroluminescence element,
light emitted from the electroluminescence element is reflected from a subject to be radiated to the photodiode,
the photodiode and the plurality of thin film transistors generate an image signal from the light reflected to the photodiode,
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer and an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
20. An area sensor according to claim 19 , wherein the N-type semiconductor layer comprises polysilicon.
21. An area sensor according to claim 19 , wherein the P-type semiconductor layer comprises polysilicon.
22. An area sensor according to claim 19 , wherein the photoelectric conversion layer comprises amorphous silicon.
23. An area sensor according to claim 19 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
24. An area sensor according to claim 19 , wherein the area sensor is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.
25. A display apparatus comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element and a plurality of thin film transistors,
wherein:
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer and an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
26. A display apparatus according to claim 25 , wherein the N-type semiconductor layer comprises polysilicon.
27. A display apparatus according to claim 25 , wherein the P-type semiconductor layer comprises polysilicon.
28. A display apparatus according to claim 25 , wherein the photoelectric conversion layer comprises amorphous silicon.
29. A display apparatus according to claim 25 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
30. A display apparatus according to claim 25 , wherein the display apparatus is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.
31. A display apparatus comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element and a plurality of thin film transistors,
wherein:
a light emitted from the electroluminescence element is reflected from a subject to be radiated to the photodiode,
the photodiode generates an image signal from the light reflected to the photodiode,
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer and an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
32. A display apparatus according to claim 31 , wherein the N-type semiconductor layer comprises polysilicon.
33. A display apparatus according to claim 31 , wherein the P-type semiconductor layer comprises polysilicon.
34. A display apparatus according to claim 31 , wherein the photoelectric conversion layer comprises amorphous silicon.
35. A display apparatus according to claim 31 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
36. A display apparatus according to claim 31 , wherein the display apparatus is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.
37. A display apparatus comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element and a plurality of thin film transistors,
wherein:
the plurality of thin film transistors control light emission of the electroluminescence element,
a light emitted from the electroluminescence element is reflected from a subject to be radiated to the photodiode,
the photodiode and the plurality of thin film transistors generate an image signal from the light reflected to the photodiode,
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer and an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
38. A display apparatus according to claim 37 , wherein the N-type semiconductor layer comprises polysilicon.
39. A display apparatus according to claim 37 , wherein the P-type semiconductor layer comprises polysilicon.
40. A display apparatus according to claim 37 , wherein the photoelectric conversion layer comprises amorphous silicon.
41. A display apparatus according to claim 37 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
42. A display apparatus according to claim 25 , wherein the display apparatus is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.
43. A display apparatus comprising a sensor portion, the sensor portion comprising:
a plurality of pixels, each of the plurality of pixels comprising a photodiode, an electroluminescence element, a switching TFT, an electroluminescence driving TFT, a reset TFT, a buffer TFT and a selective TFT, wherein:
the switching TFT and the electroluminescence driving TFT control light emission of the electroluminescence element,
light emitted from the electroluminescence element is reflected from a subject to be radiated to the photodiode,
the photodiode and the plurality of thin film transistors generate an image signal from the light reflected to the photodiode,
the photodiode includes a photoelectric conversion layer that is in contact with a part of a P-type semiconductor layer and an N-type semiconductor layer,
the photoelectric conversion layer is made of an amorphous semiconductor film, and
the photoelectric conversion layer is thicker than the P-type semiconductor layer and the N-type semiconductor layer.
44. A display apparatus according to claim 43 , wherein the N-type semiconductor layer comprises polysilicon.
45. A display apparatus according to claim 43 , wherein the P-type semiconductor layer comprises polysilicon.
46. A display apparatus according to claim 43 , wherein the photoelectric conversion layer comprises amorphous silicon.
47. A display apparatus according to claim 43 , wherein the electroluminescence element has a positive electrode, a negative electrode and an electroluminescence layer provided between the positive electrode and the negative electrode.
48. A display apparatus according to claim 25 , wherein the display apparatus is included in electronic equipment selected from the group of: a video camera, a digital still camera, a notebook computer and a portable information terminal.