Display device, light-emitting device, lighting device, and electronic appliance

Patent metadata

Field	Value
Publication number	US-8946699-B2
Application number	US-201213352794-A
Country	US
Kind code	B2
Filing date	Jan 18, 2012
Priority date	Jan 21, 2011
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

A light energy reuse type display device, light-emitting device, and lighting device with low power consumption, which efficiently convert light emitted from a light source (including light emission from a light-emitting element) into electric power, are provided. A photoelectric conversion element interposed between a pair of substrates functions as a color filter (a colored layer); thus, light emitted from a light source (including light emission from a light-emitting element) is efficiently converted into electric power, and a light energy reuse type display device, light-emitting device, and lighting device with low power consumption can be provided.

First claim

What is claimed is:

1. A light-emitting device comprising:
a first photoelectric conversion element, a light-emitting element, and a transistor which are provided between a pair of substrates,
wherein the light-emitting element is electrically connected to the transistor,
wherein the light-emitting element overlaps with the first photoelectric conversion element,
wherein the first photoelectric conversion element comprises a colored layer having a transmitting property to light emitted from the light-emitting element in a specific wavelength band, and
wherein the light is emitted from the light-emitting element through the colored layer.

2. The light-emitting device according to claim 1 ,
wherein the first photoelectric conversion element comprises an organic thin film solar cell,
wherein the first photoelectric conversion element functions as a color filter.

3. The light-emitting device according to claim 1 ,
wherein one of the pair of substrates is provided with the light-emitting element, and
wherein the other one of the pair of substrates is provided with the first photoelectric conversion element.

4. The light-emitting device according to claim 1 , wherein the transistor comprises an oxide semiconductor.

5. The light-emitting device according to claim 4 , wherein the oxide semiconductor is In—Ga—Zn—O-based metal oxide.

6. An electronic appliance comprising the light-emitting device according to claim 1 .

7. The light-emitting device according to claim 1 , wherein the light-emitting element emits white light.

8. The light-emitting device according to claim 1 , further comprising a second photoelectric conversion element adjacent to the first photoelectric conversion element,
wherein the second photoelectric conversion element functions as a light-blocking film.

9. A light-emitting device comprising:
a first photoelectric conversion element and a light-emitting element which are provided between a pair of substrates,
wherein the light-emitting element overlaps with the first photoelectric conversion element,
wherein the first photoelectric conversion element comprises a colored layer having a transmitting property to light emitted from the light-emitting element in a specific wavelength band, and
wherein the light is emitted from the light-emitting element through the colored layer.

10. The light-emitting device according to claim 9 ,
wherein the first photoelectric conversion element comprises an organic thin film solar cell,
wherein the first photoelectric conversion element functions as a color filter.

11. The light-emitting device according to claim 9 ,
wherein one of the pair of substrates is provided with the light-emitting element, and
wherein the other one of the pair of substrates is provided with the first photoelectric conversion element.

12. An electronic appliance comprising the light-emitting device according to claim 9 .

13. The light-emitting device according to claim 9 , wherein the light-emitting element emits white light.

14. The light-emitting device according to claim 9 , further comprising a second photoelectric conversion element adjacent to the first photoelectric conversion element,
wherein the second photoelectric conversion element functions as a light-blocking film.

15. A display device comprising:
a light source; and
a first photoelectric conversion element and a display element which are provided between a pair of substrates,
wherein the light source overlaps with the first photoelectric conversion element,
wherein the first photoelectric conversion element comprises a colored layer having a transmitting property to light emitted from the light source in a specific wavelength band, and
wherein the light is emitted from the light source through the colored layer.

16. The display device according to claim 15 ,
wherein the first photoelectric conversion element comprises an organic thin film solar cell,
wherein the first photoelectric conversion element functions as a color filter.

17. The display device according to claim 15 , wherein the display element comprises a liquid crystal element or an electrophoretic element.

18. An electronic appliance comprising the display device according to claim 15 .

19. The display device according to claim 15 , wherein the light source emits white light.

20. The display device according to claim 15 , further comprising a second photoelectric conversion element adjacent to the first photoelectric conversion element,
wherein the second photoelectric conversion element functions as a light-blocking film.

Assignees

• Hatano Kaoru
• Seo Satoshi
• Oikawa Yoshiaki
• Semiconductor Energy Lab

Inventors

• Hatano Kaoru
• Seo Satoshi
• Oikawa Yoshiaki

Classifications

• H10F55/255

  formed in, or on, a common substrate · CPC title

• H10F77/331 Primary

  for filtering or shielding light, e.g. multicolour filters for photodetectors · CPC title

• H01L31/02162 Primary

  Electricity · mapped topic

• H01L31/173

  Electricity · mapped topic

• Y02E10/542

  Dye sensitized solar cells · CPC title