Display device with imaging function and method for driving the same

• US 9,370,074 B2
• Filed: 11/03/2011
• Issued: 06/14/2016
• Est. Priority Date: 11/05/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kurokawa, Yoshiyuki
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): Hagemeier, Herbert L
• Application Number:
  US13/288,425
• Publication Number:
  US 20120113160A1
• Time in Patent Office: 1,685 Days
• Field of Search: 345/76, 345/84, 345/173, 345/175, 345/207, 345/211, 345690-695, 345 80-108, 313/504, 313/506, 313/507, 257 79- 90, 257/225, 349/116
• US Class Current: 1/1
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: H05B 33/145 Arrangements of the electroluminescent material
• CPC Class Codes: H10K 59/65 OLEDs integrated with inorganic image sensors

Abstract

To achieve desired display on a display surface and accurate image capture in a display device with an imaging function. A light source for display (a first light-emitting element) and a light source for image capture (a second light-emitting element) that does not adversely affect display when it is on are separately provided in the display device with an imaging function. In the display device, an image can be appropriately captured using the light source for image capture in a period during which display is performed using the light source for display. Consequently, desired display on the display surface and accurate image capture can be achieved in the display device.

Claims

1. A display device with an imaging function, comprising:

a plurality of display elements arranged in matrix each comprising;

a first light-emitting element; and

a first color filter;

a plurality of imaging elements arranged in matrix each comprising;

a second light-emitting element;

a second color filter;

a third color filter;

a photodiode;

a first transistor, one of a source and a drain of the first transistor being electrically connected to the photodiode;

a second transistor, a gate of the second transistor being electrically connected to the other of the source and the drain of the first transistor;

a third transistor, one of a source and a drain of the third transistor being electrically connected to the second light-emitting element; and

a fourth transistor, one of a source and a drain of the fourth transistor being electrically connected to a gate of the third transistor; and

an imaging light source driver circuit,

wherein a gate of the fourth transistor in all of the plurality of imaging elements is electrically connected to the imaging light source driver circuit thorough a first common wiring,

wherein the other of the source and the drain of the fourth transistor in all of the plurality of imaging elements is electrically connected to the imaging light source driver circuit through a second common wiring,

wherein the first light-emitting element and the second light-emitting element are capable of emitting white light,

wherein the second color filter and the third color filter overlap each other,

wherein the first color filter is provided directly above the first light-emitting element,

wherein the second color filter and the third color filter are provided directly above the second light-emitting element,

wherein each of the first color filter, the second color filter and the third color filter has a property of transmitting visible light, and

wherein each of the second color filter and the third color filter has a property of transmitting invisible light.

2. The display device with an imaging function, according to claim 1, wherein the light emitted from the first light-emitting element through the first color filter is any one of red light, green light, blue light, and yellow light.

3. The display device with an imaging function, according to claim 1, wherein each of the first light-emitting element and the second light-emitting element is an organic electroluminescent element.

4. The display device with an imaging function, according to claim 1, wherein a light-emitting layer is shared between the first light-emitting element and the second light-emitting element.

10. The display device with an imaging function, according to claim 1,

wherein each of the plurality of display elements comprises a fifth transistor electrically connected to the first light-emitting element,

wherein a W/L of the third transistor is higher than a W/L of the fifth transistor, and

wherein W represents a channel width and L represents a channel length.

17. The display device with an imaging function, according to claim 1,

wherein a gate of the first transistor is electrically connected to a first signal line,

wherein one of a source and a drain of the second transistor is electrically connected to a potential line, and

wherein the other of the source and the drain of the second transistor is electrically connected a second signal line.

5. A display device with an imaging function, comprising:

a plurality of display elements arranged in matrix each comprising;

a first light-emitting element; and

a first color filter;

a plurality of imaging elements arranged in matrix each comprising;

a second light-emitting element;

a second color filter;

a third color filter;

a fourth color filter;

a fifth color filter;

a photodiode;

a first transistor, one of a source and a drain of the first transistor being electrically connected to the photodiode;

a second transistor, a gate of the second transistor being electrically connected to the other of the source and the drain of the first transistor;

a third transistor, one of a source and a drain of the third transistor being electrically connected to the second light-emitting element; and

a fourth transistor, one of a source and a drain of the fourth transistor being electrically connected to a gate of the third transistor; and

an imaging light source driver circuit,

wherein a gate of the fourth transistor in all of the plurality of imaging elements is electrically connected to the imaging light source driver circuit thorough a first common wiring,

wherein the other of the source and the drain of the fourth transistor in all of the plurality of imaging elements is electrically connected to the imaging light source driver circuit through a second common wiring,

wherein the first light-emitting element and the second light-emitting element are capable of emitting white light,

wherein the second color filter and the third color filter overlap each other,

wherein the fourth color filter and the fifth color filter overlap each other,

wherein the first color filter is provided directly above the first light-emitting element,

wherein the second color filter and the third color filter are provided directly above the second light-emitting element,

wherein the fourth color filter and the fifth color filter are provided directly above the photodiode,

wherein each of the first color filter, the second color filter, the third color filter, the fourth color filter, and the fifth color filter has a property of transmitting visible light, and

wherein each of the second color filter and the third color filter has a property of transmitting invisible light.

6. The display device with an imaging function, according to claim 5,

wherein the first color filter, the third color filter, and the fifth color filter are capable of absorbing light in a first wavelength region, and the second color filter and the fourth color filter are capable of absorbing light in a second wavelength region.

7. The display device with an imaging function, according to claim 5, wherein the light emitted from the first light-emitting element through the first color filter is any one of red light, green light, blue light, and yellow light.

8. The display device with an imaging function, according to claim 5, wherein each of the first light-emitting element and the second light-emitting element is an organic electroluminescent element.

9. The display device with an imaging function, according to claim 5, wherein a light-emitting layer is shared between the first light-emitting element and the second light-emitting element.

11. The display device with an imaging function, according to claim 5,

wherein each of the plurality of display elements comprises a fifth transistor electrically connected to the first light-emitting element,

wherein a W/L of the third transistor is higher than a W/L of the fifth transistor, and

wherein W represents a channel width and L represents a channel length.

18. The display device with an imaging function, according to claim 5,

wherein a gate of the first transistor is electrically connected to a first signal line,

wherein one of a source and a drain of the second transistor is electrically connected to a potential line, and

wherein the other of the source and the drain of the second transistor is electrically connected a second signal line.

12. A display device with an imaging function, comprising:

a plurality of display elements arranged in matrix each comprising;

a first light-emitting element; and

a first color filter;

a plurality of imaging elements arranged in matrix each comprising;

a second light-emitting element;

a second color filter;

a third color filter;

a photodiode;

a first transistor, one of a source and a drain of the first transistor being electrically connected to the photodiode;

a second transistor, a gate of the second transistor being electrically connected to the other of the source and the drain of the first transistor;

a third transistor, one of a source and a drain of the third transistor being electrically connected to the second light-emitting element; and

a fourth transistor, one of a source and a drain of the fourth transistor being electrically connected to a gate of the third transistor; and

an imaging light source driver circuit,

wherein a gate of the fourth transistor in all of the plurality of imaging elements is electrically connected to the imaging light source driver circuit thorough a first common wiring,

wherein the other of the source and the drain of the fourth transistor in all of the plurality of imaging elements is electrically connected to the imaging light source driver circuit through a second common wiring,

wherein the first light-emitting element and the second light-emitting element are capable of emitting white light,

wherein the second color filter and the third color filter overlap each other,

wherein the first color filter is provided directly above the first light-emitting element,

wherein the second color filter and the third color filter are provided directly above the second light-emitting element,

wherein each of the first color filter, the second color filter, and the third color filter has a property of transmitting visible light,

wherein each of the second color filter and the third color filter has a property of transmitting invisible light, and

wherein the first color filter and the third color filter are capable of absorbing light in a first wavelength region, and the second color filter is capable of absorbing light in a second wavelength region.

13. The display device with an imaging function, according to claim 12, wherein the light emitted from the first light-emitting element through the first color filter is any one of red light, green light, blue light, and yellow light.

14. The display device with an imaging function, according to claim 12, wherein each of the first light-emitting element and the second light-emitting element is an organic electroluminescent element.

15. The display device with an imaging function, according to claim 12, wherein a light-emitting layer is shared between the first light-emitting element and the second light-emitting element.

16. The display device with an imaging function, according to claim 12,

wherein each of the plurality of display elements comprises a fifth transistor electrically connected to the first light-emitting element,

wherein a W/L of the third transistor is higher than a W/L of the fifth transistor, and

wherein W represents a channel width and L represents a channel length.

19. The display device with an imaging function, according to claim 12,

wherein a gate of the first transistor is electrically connected to a first signal line,

wherein one of a source and a drain of the second transistor is electrically connected to a potential line, and

wherein the other of the source and the drain of the second transistor is electrically connected a second signal line.

20. A display device with an imaging function, comprising:

a plurality of display elements arranged in matrix each comprising a first light-emitting element;

a plurality of imaging light source elements arranged in matrix each comprising;

a second light-emitting element;

a first transistor, one of a source and a drain of the first transistor being electrically connected to the second light-emitting element; and

a second transistor, one of source and a drain of the second transistor being electrically connected to a gate of the first transistor;

a plurality of optical sensors arranged in matrix each comprising a photodiode; and

an imaging light source driver circuit,

wherein a gate of the second transistor in all of the plurality of imaging light source elements is electrically connected to the imaging light source driver circuit through a first common wiring.

21. The display device with an imaging function, according to claim 20, wherein the other of the source and the drain of the second transistor in all of the plurality of imaging light source elements is electrically connected to the imaging light source driver circuit through a second common wiring.

22. The display device with an imaging function, according to claim 20, comprising a power source circuit electrically connected the plurality of display elements, the plurality of imaging light source elements, and the plurality of optical sensors.

23. The display device with an imaging function, according to claim 20, comprising a color filter overlapping with the first light-emitting element and not overlapping with the second light-emitting element and the photodiode.

24. The display device with an imaging function, according to claim 20, comprising:

a first color filter overlapping with the first light-emitting element, the second light-emitting element, and the photodiode; and

a second color filter overlapping with the second light-emitting element and the photodiode and not overlapping with the first light-emitting element.