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