Flexible display device having first and second display panels overlapping each other and light transmitting layer therebetween

1. A display device being at least partly flexible comprising:

a first display panel;

a second display panel; and

a light-transmitting layer,

wherein the first display panel includes a first region and a light-blocking region,

wherein the first region has a function of performing display,

wherein the second display panel includes a second region and a third region,

wherein the second region has a function of performing display,

wherein the third region is adjacent to the second region,

wherein the third region has a function of transmitting visible light,

wherein the light-transmitting layer includes a light-transmitting material having a transmittance with respect to light in a wavelength range of 450 nm to 700 nm of 80% or more on the average, and a higher refractive index than air,

wherein the light-transmitting layer is between the first display panel and the second display panel,

wherein the light-transmitting layer is positioned on a display surface side of the first display panel,

wherein the light-transmitting layer is positioned on a side opposite to a display surface side of the second display panel,

wherein the third region overlaps part of the first region with the light-transmitting layer provided therebetween,

wherein the second region and the light-blocking region are spaced from each other, and

wherein a flexible printed circuit is in contact with and electrically connected to a surface of the first display panel on a second region side of the light-blocking region.

2. The display device according to claim 1 ,

wherein the second display panel includes a fourth region,

wherein the fourth region is adjacent to the second region,

wherein the fourth region has a function of blocking visible light, and

wherein the fourth region does not include a region overlapping with the first region.

3. The display device according to claim 2 ,

wherein the fourth region functions as a wiring portion electrically connected to a light-emitting element included in the second region.

4. The display device according to claim 1 ,

wherein the first region includes a light-emitting element,

wherein the second region includes a light-emitting element, and

wherein the third region includes a bonding layer.

5. The display device according to claim 1 ,

wherein the light-transmitting material has a transmittance with respect to light in the wavelength range of 450 nm to 700 nm of 90% or more on the average.

6. The display device according to claim 1 ,

wherein the light-transmitting material has a refractive index of higher than or equal to 1.3 and lower than or equal to 1.8.

7. The display device according to claim 1 ,

wherein the light-transmitting layer is detachably in contact with at least one of the first display panel and the second display panel.

8. The display device according to claim 1 ,

wherein the light-transmitting layer includes an inert material.

9. The display device according to claim 1 ,

wherein the light-transmitting layer includes a nonvolatile material.

10. The display device according to claim 1 ,

wherein the light-transmitting layer has a material with a viscosity of greater than or equal to 1 mPa·s and less than or equal to 1000 Pa·s.

11. An electronic device comprising:

the display device according to claim 1 , and

an antenna, a battery, a housing, a speaker, a microphone, an operation switch, or an operation button.

12. A display device being at least partly flexible comprising:

a first display panel;

a second display panel; and

a light-transmitting layer,

wherein the first display panel includes a light-blocking region,

wherein the light-transmitting layer includes a light-transmitting material having a transmittance with respect to light in a wavelength range of 450 nm to 700 nm of 80% or more on the average, and a higher refractive index than air,

wherein the light-transmitting layer is between the first display panel and the second display panel,

wherein the light-transmitting layer is positioned on a display surface side of the first display panel,

wherein the light-transmitting layer is positioned on a side opposite to a display surface side of the second display panel,

wherein part of the second display panel overlaps part of the first display panel with the light-transmitting layer provided therebetween,

wherein the second display panel and the light-blocking region are spaced from each other, and

wherein a flexible printed circuit is in contact with and electrically connected to a surface of the first display panel on a second display panel side of the light-blocking region.

13. The display device according to claim 12 ,

wherein the light-transmitting material has a transmittance with respect to light in the wavelength range of 450 nm to 700 nm of 90% or more on the average.

14. The display device according to claim 12 ,

wherein the light-transmitting material has a refractive index of higher than or equal to 1.3 and lower than or equal to 1.8.

15. The display device according to claim 12 ,

wherein the light-transmitting layer is detachably in contact with at least one of the first display panel and the second display panel.

16. The display device according to claim 12 ,

wherein the light-transmitting layer includes an inert material.

17. The display device according to claim 12 ,

wherein the light-transmitting layer includes a nonvolatile material.

18. The display device according to claim 12 ,

wherein the light-transmitting layer has a material with a viscosity of greater than or equal to 1 mPa·s and less than or equal to 1000 Pa·s.

19. An electronic device comprising:

the display device according to claim 12 , and

an antenna, a battery, a housing, a speaker, a microphone, an operation switch, or an operation button.