Display device and electronic device

• US 7,161,185 B2
• Filed: 06/22/2004
• Issued: 01/09/2007
• Est. Priority Date: 06/27/2003
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Watanabe, Yasuko, Yamazaki, Shunpei
• Primary Examiner(s): TRAN, THUY V
• Application Number:
  US10/872,398
• Publication Number:
  US 20040263069A1
• Time in Patent Office: 931 Days
• Field of Search: 345 32- 33, 345/34, 345/55, 345/84, 345/44, 257 88- 89, 257/98, 257/103
• 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. 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.

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.

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.

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.