1. A display device comprising:
a pixel comprising a first sub-pixel having a first light-emitting element and a second sub-pixel having a second light-emitting element, each of the first and second light-emitting elements comprising a pixel electrode, an electroluminescent layer, and an opposite electrode;
a first source driver which supplies a first video signal for the first sub-pixel; and
a second source driver which supplies a second video signal for the second sub-pixel,
wherein the pixel electrode and the opposite electrode of the first light-emitting element have light-transmitting properties,
wherein the pixel electrode of the second light-emitting element has reflectiveness;
wherein the electroluminescent layers of the first light-emitting element and the second light-emitting element are provided in a same layer,
wherein the opposite electrodes of the first light-emitting element and the second light-emitting element are provided in a same layer, and
wherein a reflective layer is provided so as to overlap with the opposite electrode of the first light-emitting element.
2. A device according to claim 1, further comprising gate drivers which control the first sub-pixel and the second sub-pixel.
3. A device according to claim 1, further comprising a first gate driver which control the first sub-pixel and a second gate driver which control the second sub-pixel.
4. A device according to claim 1, wherein the number of transistors including the first sub-pixel and the number of transistors including the second sub-pixel are the same.
5. A device according to claim 1, wherein the number of transistors including the first sub-pixel and the number of transistors including the second sub-pixel are different.
6. A device according to claim 1, wherein each of the first light-emitting element and the second light-emitting element emits one of red, green, and blue light.
7. A device according to claim 1, wherein the first light-emitting element and the second light-emitting element emit white light.
8. A device according to claim 1, wherein the first source driver is connected to a first digital data line and the second source driver is connected to a second digital data line.
9. A device according to claim 1, wherein the first source driver is connected to a digital data line and the second source driver is connected to an analog data line.
10. A device according to claim 1, wherein the first source driver is connected to a first analog data line and the second source driver is connected to a second analog data line.
11. An electronic device using the display device according to claim 1.
12. A device according to claim 11, wherein said electronic device is selected from the group consisting of a television apparatus, a digital camera, a digital video camera, a cellular phone device, a portable information terminal, a portable game machine, a monitor, a personal computer, a tablet PC, an audio reproducing device, and an image reproducing device provided with a recording medium.
13. The display device according to claim 1,
wherein the pixel is provided over a surface of a light-transmitting substrate;
wherein a first display region using the first sub-pixel is provided over the surface of the substrate; and
wherein a second display region using the second sub-pixel is provided over an opposite surface of the substrate.
14. A display device comprising:
a pixel comprising a first sub-pixel having a first light-emitting element and a second sub-pixel having a second light-emitting element over a substrate, each of the first and second light-emitting elements comprising a pixel electrode, an electroluminescent layer, and an opposite electrode;
a first source driver which supplies a first video signal for the first sub-pixel; and
a second source driver which supplies a second video signal for the second sub-pixel,
wherein the opposite electrodes of the first light-emitting element and the second light-emitting element are provided in a same layer and have light-transmitting properties,
wherein the electroluminescent layers of the first light-emitting element and the second light-emitting element are provided in a same layer, and
wherein a first reflective layer is provided so as to overlap with the opposite electrode of the first light-emitting element.
15. A device according to claim 14, further comprising gate drivers which control the first sub-pixel and the second sub-pixel.
16. A device according to 14, further comprising a first gate driver which control the first sub-pixel and a second gate driver which control the second sub-pixel.
17. A device according to 14, wherein the number of transistors including the first sub-pixel and the number of transistors including the second sub-pixel are the same.
18. A device according to 14, wherein the number of transistors including the first sub-pixel and the number of transistors including the second sub-pixel are different.
19. A device according to 14, wherein each of the first light-emitting element and the second light-emitting element emits one of red, green, and blue light.
20. A device according to 14, wherein the first light-emitting element and the second light-emitting element emit white light.
21. A device according to 14, wherein the first source driver is connected to a first digital data line and the second source driver is connected to a second digital data line.
22. A device according to 14, wherein the first source driver is connected to a digital data line and the second source driver is connected to an analog data line.
23. A device according to 14, wherein the first source driver,is connected to a first analog data line and the second source driver is connected to a second analog data line.
24. The display device according to 14,
wherein a first display region using the first sub-pixel is provided over the surface of the substrate; and
wherein a second display region using the second sub-pixel is provided over an opposite surface of the substrate.
25. An electronic device using the display device according to claim 14.
26. A device according to 25, wherein said electronic device is selected from the group consisting of a television apparatus, a digital camera, a digital video camera, a cellular phone device, a portable information terminal, a portable game machine, a monitor, a personal computer, a tablet PC, an audio reproducing device, and an image reproducing device provided with a recording medium.
27. A display device comprising:
a pixel comprising a first sub-pixel having a first light-emitting element and a second sub-pixel having a second light-emitting element over a substrate, each of the first and second light-emitting elements comprising a pixel electrode, an electroluminescent layer, and an opposite electrode;
a first source driver which supplies a first video signal for the first sub-pixel; and
a second source driver which supplies a second video signal for the second sub-pixel,
wherein the opposite electrodes of the first light-emitting element and the second light-emitting element are provided in a same layer and have light-transmitting properties,
wherein the electroluminescent layers of the first light-emitting element and the second light-emitting element are provided in a same layer,
wherein a first reflective layer is provided so as to overlap with the opposite electrode of the first light-emitting element, and
wherein the first light-emitting element emits light in a first direction and the second light-emitting element emits light in a second diction.
28. A device according to 27, further comprising gate drivers which control the first sub-pixel and the second sub-pixel.
29. A device according to 27, further comprising a first gate driver which control the first sub-pixel and a second gate driver which control the second sub-pixel.
30. A device according to 27, wherein the number of transistors including the first sub-pixel and the number of transistors including the second sub-pixel are the same.
31. A device according to 27, wherein the number of transistors including the first sub-pixel and the number of transistors including the second sub-pixel are different.
32. A device according to 27, wherein each of the first light-emitting element and the second light-emitting element emits one of red, green, and blue light.
33. A device according to 27, wherein the first light-emitting element and the second light-emitting element emit white light.
34. A device according to 27, wherein the first source driver is connected to a first digital data line and the second source driver is connected to a second digital data line.
35. A device according to 27, wherein the first source driver is connected to a digital data line and the second source driver is connected to an analog data line.
36. A device according to 27, wherein the first source driver is connected to a first analog data line and the second source driver is connected to a second analog data line.
37. The display device according to 27,
wherein a first display region using the first sub-pixel is provided over the surface of the substrate; and
wherein a second display region using the second sub-pixel is provided over an opposite surface of the substrate.
38. An electronic device using the display device according to claim 27.
39. A device according to claim 38, wherein said electronic device is selected from the group consisting of a television apparatus, a digital camera, a digital video camera, a cellular phone device, a portable information terminal, a portable game machine, a monitor, a personal computer, a tablet PC, an audio reproducing device, and an image reproducing device provided with a recording medium.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An image sensor, comprising a photodiode, a first TFT, a second TFT, and a third TFT provided at each pixel, wherein:
an anode terminal of the photodiode is connected to a gate terminal of the first TFT and a source terminal of the third TFT, and a cathode terminal of the photodiode is connected to a first control signal line;
a drain terminal of the first TFT is connected to a first power source line, and a source terminal of the first TFT is connected to a drain terminal of the second TFT;
a gate terminal of the second TFT is connected to the first control signal line, and a source terminal of the second TFT is connected to an output signal line; and
a gate terminal of the third TFT is connected to a second control signal line, and a drain terminal of the third TFT is connected to a second power source line.
2. An image sensor, comprising a photodiode, a first TFT, and a second TFT provided at each pixel, wherein:
one of terminals of the photodiode is connected to a gate terminal of the first TFT and a source terminal of the second TFT, and other terminal is connected to a first control signal line;
a drain terminal of the first TFT is connected to a first power source line, and a source terminal of the first TFT is connected to an output signal line;
a gate terminal of the second TFT is connected to a second control signal line, and a drain terminal of the second TFT is connected to a second power source line;
the first TFT and the second TFT are formed with an inverted staggered structure, a top contact structure, or a bottom contact structure; and
in the first TFT, a two-dimensionally overlapping area of a source electrode and a gate electrode is smaller than a two-dimensionally overlapping area of a drain electrode and the gate electrode.
3. The image sensor as claimed in claim 2, wherein:
the first TFT includes a curve part in a first border line between a drain region and a channel region and in a second border line between a source region and the channel region; and
length of the first border line is longer than length of the second border line.
4. The image sensor as claimed in claim 1, wherein
the first to third TFTs are formed with an amorphous silicon or an oxide semiconductor.
5. The image sensor as claimed in claim 2, wherein
the first and second TFTs are formed with an amorphous silicon or an oxide semiconductor.
6. A method for driving an image sensor which comprises a photodiode, a first TFT, a second TFT, and a third TFT provided at each pixel, wherein:
an anode terminal of the photodiode is connected to a gate terminal of the first TFT and a source terminal of the third TFT, and a cathode terminal of the photodiode is connected to a first control signal line;
a drain terminal of the first TFT is connected to a first power source line, and a source terminal of the first TFT is connected to a drain terminal of the second TFT;
a gate terminal of the second TFT is connected to the first control signal line, and a source terminal of the second TFT is connected to an output signal line; and
a gate terminal of the third TFT is connected to a second control signal line, and a drain terminal of the third TFT is connected to a second power source line, the method comprising:
dividing a driving period of the image sensor to an integrating period where a light signal is irradiated to the pixels and to a readout period where a signal is read out from the pixels;
setting a gate voltage of the first TFT to be smaller than a source voltage of the first TFT in the integrating period; and
setting the gate voltage of the first TFT to be larger than the source voltage of the first TFT in the readout period.
7. A method for driving an image sensor which comprises a photodiode, a first TFT, and a second TFT provided at each pixel, wherein:
one of terminals of the photodiode is connected to a gate terminal of the first TFT and a source terminal of the second TFT, and other terminal is connected to a first control signal line;
a drain terminal of the first TFT is connected to a first power source line, and a source terminal of the first TFT is connected to an output signal line;
a gate terminal of the second TFT is connected to a second control signal line, and a drain terminal of the second TFT is connected to a second power source line;
the first TFT and the second TFT are formed with an inverted staggered structure, a top contact structure, or a bottom contact structure; and
in the first TFT, a two-dimensionally overlapping area of a source electrode and a gate electrode is smaller than a two-dimensionally overlapping area of a drain electrode and the gate electrode, the method comprising:
dividing a driving period of the image sensor to an integrating period where a light signal is irradiated to the pixels and to a readout period where a signal is read out from the pixels;
setting a gate voltage of the first TFT to be smaller than a source voltage of the first TFT in the integrating period; and
setting the gate voltage of the first TFT to be larger than the source voltage of the first TFT in the readout period.