Display Device and Electronic Device

• US 20070108454A1
• Filed: 01/05/2007
• Published: 05/17/2007
• Est. Priority Date: 06/27/2003
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Watanabe, Yasuko, Yamazaki, Shunpei
• Granted Patent: US 8,482,484 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: H01L 27/14678 Contact-type imagers
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/65 OLEDs integrated with inorganic image sensors

Abstract

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.

Claims

1. (canceled)

2. A display device comprising:

a substrate which transmits light;

a first display surface over one surface of the substrate;

a second display surface over another surface of the substrate; and

a transistor and a light-emitting element over the one surface of the substrate,

wherein the light-emitting element emits light to the first display surface and to the second display surface,

wherein light obtained from the light-emitting element is white, and

wherein each of the first display surface and the second display surface performs a monochrome display.

3. A display device according to claim 2, further comprising an imaging device over the one surface of the substrate.

4. A display device according to claim 3, wherein the imaging device includes an amorphous semiconductor.

5. A display device according to claim 2,

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.

6. A display device according to claim 5, wherein a plurality of openings are provided for one or both of the two polarizers.

7. 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 the display device according to claim 2.

8. A display device according to claim 2, wherein the display device has a switching circuit which controls a display of the first display surface or the second display surface.

9. A display device according to claim 8, wherein the display is selected from a group consisting of a normal display, a horizontally reversed display, a 180°

rotated display and a vertically reversed display.

10. A display device comprising:

a substrate which transmits light;

a first display surface over one surface of the substrate;

a second display surface over another surface of the substrate;

a transistor and a light-emitting element over the one surface of the substrate; and

a color filter over the another surface of the substrate,

wherein the light-emitting element emits light to the first display surface and to the second display surface,

wherein light obtained from the light-emitting element is white, and

wherein the first display surface performs a monochrome display and the second display surface performs a color display.

11. A display device according to claim 10, further comprising an imaging device over the one surface of the substrate.

12. A display device according to claim 11, wherein the imaging device includes an amorphous semiconductor.

13. A display device according to claim 10,

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.

14. A display device according to claim 13, wherein a plurality of openings are provided for one or both of the two polarizers.

15. 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 the display device according to claim 10.

16. A display device according to claim 10, wherein the display device has a switching circuit which controls a display of the first display surface or the second display surface.

17. A display device according to claim 16, wherein the display is selected from a group consisting of a normal display, a horizontally reversed display, a 180°

rotated display and a vertically reversed display.

18. A display device comprising:

a substrate which transmits light;

a first display surface over one surface of the substrate;

a second display surface over another surface of the substrate;

a transistor and a light-emitting element over the one surface of the substrate; and

a color filter over the one surface of the substrate,

wherein the light-emitting element emits light to the first display surface and to the second display surface,

wherein light obtained from the light-emitting element is white, and

wherein the first display surface performs a color display and the second display surface performs a monochrome display.

19. A display device according to claim 18, further comprising an imaging device over the one surface of the substrate.

20. A display device according to claim 19, wherein the imaging device includes an amorphous semiconductor.

21. A display device according to claim 18,

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.

22. A display device according to claim 21, wherein a plurality of openings are provided for one or both of the two polarizers.

23. 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 the display device according to claim 18.

24. A display device according to claim 18, wherein the display device has a switching circuit which controls a display of the first display surface or the second display surface.

25. A display device according to claim 24, wherein the display is selected from a group consisting of a normal display, a horizontally reversed display, a 180°

rotated display and a vertically reversed display.

26. A display device comprising:

a substrate which transmits light;

a first display surface over one surface of the substrate;

a second display surface over another surface of the substrate;

a transistor and a light-emitting element over the one surface of the substrate,

a first color filter over the one surface of the substrate; and

a second color filter over the another surface of the substrate,

wherein the light-emitting element emits light to the first display surface and to the second display surface,

wherein light obtained from the light-emitting element is white, and

wherein the first display surface performs a color display and the second display surface performs a color display.

27. A display device according to claim 26, further comprising an imaging device over the one surface of the substrate.

28. A display device according to claim 27, wherein the imaging device includes an amorphous semiconductor.

29. A display device according to claim 26,

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.

30. A display device according to claim 29, wherein a plurality of openings are provided for one or both of the two polarizers.

31. 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 the display device according to claim 26.

32. A display device according to claim 26, wherein the display device has a switching circuit which controls a display of the first display surface or the second display surface.

33. A display device according to claim 32, wherein the display is selected from a group consisting of a normal display, a horizontally reversed display, a 180°

rotated display and a vertically reversed display.

34. A display device comprising:

a substrate which transmits light;

a first display surface over one surface of the substrate;

a second display surface over another surface of the substrate; and

a transistor and a light-emitting element over the one surface of the substrate,

wherein the light-emitting element emits light to the first display surface and to the second display surface,

wherein light obtained from the light-emitting element is red, blue, or green, and

wherein the first display surface performs a color display and the second display surface performs a color display.

35. A display device according to claim 34, further comprising an imaging device over the one surface of the substrate.

36. A display device according to claim 35, wherein the imaging device includes an amorphous semiconductor.

37. A display device according to claim 34,

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.

38. A display device according to claim 37, wherein a plurality of openings are provided for one or both of the two polarizers.

39. 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 the display device according to claim 34.

40. A display device according to claim 34, wherein the display device has a switching circuit which controls a display of the first display surface or the second display surface.

41. A display device according to claim 40, wherein the display is selected from a group consisting of a normal display, a horizontally reversed display, a 180°

rotated display and a vertically reversed display.