Display device and electronic device
View Patent ↗A display device and an electronic device in which more sophistication and a high added value are realized by obtaining a read function by incorporating an imaging device, and by using a panel with small volume can be provided. A display device and an electronic device according to the invention has a first display surface and a plurality of pixels arranged in matrix over one surface of a light transmitting substrate and a second display surface over the other surface of the substrate. The plurality of pixels are each provided with a transistor, an imaging device, and a light-emitting element which emits light to the first display surface and the second display surface. The light-emitting element has two functions of serving as a light source when information of a subject is read and displaying an image. Thus, a display device according to the invention has two functions of an image sensor function to read information of a subject by using an imaging device and a display function to display an image by using the imaging device and the light-emitting element.
1. A display device comprising:
a substrate which transmits light;
a first display surface and a plurality of pixels arranged in matrix over one surface of the substrate; and
a second display surface over another surface of the substrate,
wherein each of the plurality of the pixels comprises a transistor, an imaging device, and a light-emitting element which emits light to the first display surface and to the second display surface.
2. A display device according to claim 1 ,
wherein a channel region of the transistor is formed of an amorphous semiconductor or a crystalline semiconductor.
3. A display device according to claim 1 ,
wherein the imaging device includes an amorphous semiconductor.
4. A display device according to claim 1 ,
further comprising a counter substrate which is opposite to the substrate,
wherein the substrate and the counter substrate are sandwiched between at least two polarizers having different polarization directions.
5. A display device according to claim 1 ,
further comprising a counter substrate which is opposite to the substrate,
wherein the substrate and the counter substrate are sandwiched between two polarizers having different polarization directions, and
a plurality of openings are provided for one or both of the two polarizers.
6. A display device according to claim 1 ,
wherein light obtained from the light-emitting element is white.
7. A display device according to claim 1 ,
wherein light obtained from the light-emitting element is red, blue, or green.
8. A display device according to claim 1 ,
further comprising a counter substrate which is opposite the substrate, wherein light obtained from the light-emitting element is white, and
a color filter is provided over the substrate or the counter substrate.
9. A display device according to claim 1 ,
further comprising a counter substrate which is opposite to the substrate, wherein light obtained from the light-emitting element is white, and
a color filter is provided over the substrate and the counter substrate.
10. A display device according to claim 1 ,
further comprising a counter substrate which is opposite to the substrate,
wherein light obtained from the light-emitting element is blue, and
a color conversion layer is provided over the substrate or the counter substrate.
11. A display device according to claim 1 ,
further comprising a counter substrate which is opposite to the substrate,
wherein light obtained from the light-emitting element is blue, and
a color conversion layer is each provided over the substrate and the counter substrate.
12. A display device according to claim 1 ,
wherein the display device has a switching circuit which controls display of the first display surface or the second display surface.
13. An electronic device selected from the group consisting of a portable cellular phone, a tablet PC, a wristwatch portable terminal, a digital video camera, and a digital camera comprising a display device according to claim 1 .
14. A display device according to claim 1 ,
wherein a first electrode and a second electrode in the light-emitting element are formed of a light transmitting material.
15. A light display device according to claim 1 ,
wherein the light-emitting element is not overlapped with the transistor.
16. A display device comprising:
a substrate which transmits light;
a first display surface and a plurality of pixels arranged in matrix over one surface of the substrate; and
a second display surface over another surface of the substrate,
wherein each of the plurality of the pixels comprises a transistor, an imaging device, and a light-emitting element which emits light to the first display surface and to the second display surface,
the light-emitting element is provided above the transistor, and
the imaging device is provided above the light-emitting element.
17. A display device according to claim 16 ,
wherein a channel region of the transistor is formed of an amorphous semiconductor or a crystalline semiconductor.
18. A display device according to claim 16 ,
wherein the imaging device includes an amorphous semiconductor.
19. A display device according to claim 16 ,
further comprising a counter substrate which is opposite to the substrate,
wherein the substrate and the counter substrate are sandwiched between at least two polarizers having different polarization directions.
20. A display device according to claim 16 ,
further comprising a counter substrate which is opposite to the substrate,
wherein the substrate and the counter substrate are sandwiched between two polarizers having different polarization directions, and
a plurality of openings are provided for one or both of the two polarizers.
21. A display device according to claim 16 ,
wherein light obtained from the light-emitting element is white.
22. A display device according to claim 16 ,
wherein light obtained from the light-emitting element is red, blue, or green.
23. A display device according to claim 16 ,
further comprising a counter substrate which is opposite to the substrate, wherein light obtained from the light-emitting element is white, and
a color filter is provided over the substrate or the counter substrate.
24. A display device according to claim 16 ,
further comprising a counter substrate which is opposite the substrate, wherein light obtained from the light-emitting element is white, and
a color filter is provided over the substrate and the counter substrate.
25. A display device according to claim 16 ,
further comprising a counter substrate which is opposite the substrate,
wherein light obtained from the light-emitting element is blue, and
a color conversion layer is provided over the substrate or the counter substrate.
26. A display device according to claim 16 ,
further comprising a counter substrate which is opposite the substrate,
wherein light obtained from the light-emitting element is blue, and
a color conversion layer is each provided over the substrate and the counter substrate.
27. A display device according to claim 16 ,
wherein the display device has a switching circuit which controls display of the first display surface or the second display surface.
28. An electronic device selected from the group consisting of a portable cellular phone, a tablet PC, a wristwatch portable terminal, a digital video camera, and a digital camera comprising a display device according to claim 14 .
29. A display device according to claim 16 ,
wherein a first electrode and a second electrode in the light-emitting element are formed of a light transmitting material.
30. A display device according to claim 16 ,
wherein the light-emitting element is not overlapped with the transistor.
31. A display device comprising:
a substrate which transmits light;
a first display surface and a plurality of pixels arranged in matrix over one surface of the substrate; and
a second display surface over another surface of the substrate,
wherein each of the plurality of the pixels comprises a transistor, an imaging device, and a light-emitting element which emits light to the first display surface and to the second display surface, and
the light-emitting element is provided above the transistor and the imaging device.
32. A display device according to claim 31 ,
wherein a channel region of the transistor is formed of an amorphous semiconductor or a crystalline semiconductor.
33. A display device according to claim 31 ,
wherein the imaging device includes an amorphous semiconductor.
34. A display device according to claim 31 ,
further comprising a counter substrate which is opposite the substrate,
wherein the substrate and the counter substrate are sandwiched between at least two polarizers having different polarization directions.
35. A display device according to claim 31 ,
further comprising a counter substrate which is opposite the substrate,
wherein the substrate and the counter substrate are sandwiched between two polarizers having different polarization directions, and
a plurality of openings are provided for one or both of the two polarizers.
36. A display device according to claim 31
wherein light obtained from the light-emitting element is white.
37. A display device according to claim 31 ,
wherein light obtained from the light-emitting element is red, blue, or green.
38. A display device according to claim 31 ,
further comprising a counter substrate which is opposite the substrate, wherein light obtained from the light-emitting element is white, and
a color filter is provided over the substrate or the counter substrate.
39. A display device according to claim 31 ,
further comprising a counter substrate which is opposite the substrate, wherein light obtained from the light-emitting element is white, and
a color filter is provided over the substrate and the counter substrate.
40. A display device according to claim 31 ,
further comprising a counter substrate which is opposite the substrate,
wherein light obtained from the light-emitting element is blue, and
a color conversion layer is provided over the substrate or the counter substrate.
41. A display device according to claim 31 ,
further comprising a counter substrate which is opposite the substrate,
wherein light obtained from the light-emitting element is blue, and
a color conversion layer is each provided over the substrate and the counter substrate.
42. A display device according to claim 31 ,
wherein the display device has a switching circuit which controls display of the first display surface or the second display surface.
43. An electronic device selected from the group consisting of a portable cellular phone, a tablet PC, a wristwatch portable terminal, a digital video camera, and a digital camera comprising a display device according to claim 31 .
44. A display device according to claim 31 ,
wherein a first electrode and a second electrode in the light-emitting element are formed of a light transmitting material.
45. A display device according to claim 31 ,
wherein the light-emitting element is not overlapped with the transistor.