Display Device with Imaging Function and Method for Driving the Same

• US 20120113160A1
• Filed: 11/03/2011
• Published: 05/10/2012
• 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
• Granted Patent: US 9,370,074 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• 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 display element comprising;

a first light-emitting element; and

a first color filter; and

an imaging element comprising;

a second light-emitting element; and

a photodiode,

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

wherein display is performed using light emitted from the first light-emitting element through the first color filter, and

wherein an image is captured using light emitted from the second light-emitting element.

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

wherein the imaging element further comprises a second color filter and a third color filter, and

wherein the second color filter and the third color filter overlap with each other.

3. The display device with an imaging function, according to claim 2,

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.

4. 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.

5. 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.

6. 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.

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

a display element comprising;

a first light-emitting element; and

a first color filter; and

an imaging element comprising;

a second light-emitting element;

a second color filter; and

a photodiode,

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

wherein display is performed using light emitted from the first light-emitting element through the first color filter, and

wherein an image is captured by irradiating an object with light with a wavelength in an infrared region, and the light with the wavelength in the infrared region is light emitted from the second light-emitting element through the second color filter.

8. The display device with an imaging function, according to claim 7,

wherein the imaging element further comprises a third color filter, and

wherein the second color filter and the third color filter overlap with each other.

9. The display device with an imaging function, according to claim 8,

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.

10. The display device with an imaging function, according to claim 7,

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.

11. The display device with an imaging function, according to claim 7,

wherein each of the first light-emitting element and the second light-emitting element is an organic electroluminescent element.

12. The display device with an imaging function, according to claim 7,

wherein a light-emitting layer is shared between the first light-element and the second light-emitting element.

13. A method for driving a display device with an imaging function, including a plurality of display elements and a plurality of imaging elements, wherein the plurality of display elements each comprises a first light-emitting element and a first color filter, and the plurality of imaging elements each comprises a second light-emitting element and a photodiode, the method comprising the step of:

controlling an on/off state of the first light-emitting element and an on/off state of the second light-emitting element independently,

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

14. The method for driving a display device with an imaging function, according to claim 13,

wherein the on/off states of the second light-emitting elements included in the plurality of imaging elements are collectively controlled.

15. The method for driving a display device with an imaging function, according to claim 13, further comprising the steps of:

a first step of capturing an image in a period during which the second light-emitting elements are on;

a second step of capturing an image in a period during which the second light-emitting elements are off; and

a third step of detecting a difference between data captured in the first step and data captured in the second step in each of the plurality of imaging elements.

16. The method for driving a display device with an imaging function, according to claim 13,

wherein the plurality of imaging elements each comprises a second color filter and a third color filter, and

wherein an image is captured by irradiating an object with light with a wavelength in an infrared region, and the light with the wavelength in the infrared region is light emitted from the second light-emitting element through the second color filter and the third color filter.

17. The method for driving a display device with an imaging function, according to claim 13,

wherein the plurality of imaging elements each comprises a second color filter and a third color filter, and the second color filter and the third color filter overlap with each other, 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.

18. The method for driving a display device with an imaging function, according to claim 13,

wherein each of the first light-emitting element and the second light-emitting element is an organic electroluminescent element.