Display and electronic unit

1. A display comprising:

a plurality of pixels, each pixel of the plurality of pixels including a light-emission device and a transparent region; and

one or more transmittance control devices located at a back-surface side of the display, the one or more transmittance control devices configured to control a transmittance of external light incident on the one or more transmittance control devices and emission light incident on the one or more transmittance control devices from the light-emission device,

wherein the one or more transmittance control devices prevent the external light and the emission light from passing through the one or more transmittance control devices when the one or more transmittance control devices are in an incident-light absorption operating mode or an incident light reflection operating mode, and

wherein the one or more transmittance control devices pass the external light and the emission light when the one or more transmittance control devices are in an incident-light transmission operating mode.

2. The display according to claim 1 , wherein the one or more transmittance control devices are capable of switching an operating mode between an incident-light transmission operating mode and incident-light absorption operating mode or reflection operating mode.

3. The display according to claim 2 , wherein the one or more transmittance control devices are capable of switching the operating mode between the incident-light transmission operating mode and the incident-light absorption operating mode or the incident light reflection operating mode, at a time of each of light emission and non-light emission of the light-emission device.

4. The display according to claim 1 , wherein the one or more transmittance control devices face the light-emission devices.

5. The display according to claim 1 , wherein the one or more transmittance control devices are disposed side by side with the light-emission devices.

6. The display according to claim 1 , wherein the one or more transmittance control devices are provided for every pixel of the plurality of the pixels.

7. The display according to claim 6 , wherein the one or more transmittance control devices are provided as being common to all the pixels of the plurality of pixels.

8. The display according to claim 6 , wherein the one or more transmittance control devices are provided for at least one of every horizontal line or every vertical line of the display.

9. The display according to claim 1 , wherein the one or more transmittance control device are provided for each of the pixels of the plurality of pixels.

10. The display according to claim 1 , wherein one or more electrodes are made common between the one or more transmittance control devices and the light-emission device.

11. The display according to claim 1 , wherein the one or more transmittance control devices include at least one of an electrochromic device and an electrowetting device.

12. The display according to claim 1 , wherein each pixel of the plurality of pixels include a pixel circuit, the pixel circuit including the light-emission device and a drive device, and

wherein at least a part of a semiconductor layer, an electrode layer of the drive device, and a wiring layer is includes a light transmissive material, within the pixel circuit.

13. The display according to claim 1 , wherein the light-emission device is an organic electroluminescence (EL) device.

14. An electronic unit including a display, the display comprising:

a plurality of pixels, each pixel of the plurality of pixels including a light-emission device and a transparent region; and

one or more transmittance control devices located at a back-surface side of the display, the one or more transmittance control devices configured to control a transmittance of external light incident on the one or more transmittance control devices and emission light incident on the one or more transmittance control devices from the light-emission device,

wherein the one or more transmittance control devices prevent the external light and the emission light from passing through the one or more transmittance control devices when the one or more transmittance control devices are in an incident-light absorption operating mode or an incident light reflection operating mode, and

wherein the one or more transmittance control devices pass the external light and the emission light when the one or more transmittance control devices are in an incident-light transmission operating mode.

15. The display according to claim 1 , wherein the light-emission device is between the one or more transmittance control devices and a substrate of the display.

16. The electronic unit according to claim 14 , wherein the one or more transmittance control devices are capable of switching an operating mode between an incident-light transmission operating mode and incident-light absorption operating mode or reflection operating mode.

17. The electronic unit according to claim 16 , wherein the one or more transmittance control devices are capable of switching the operating mode between the incident-light transmission operating mode and the incident-light absorption operating mode or the incident light reflection operating mode, at a time of each of light-emission and non-light emission of the light-emission device.

18. The electronic unit according to claim 14 , wherein the one or more transmittance control devices face the light-emission devices.

19. The electronic unit according to claim 14 , wherein the one or more transmittance control devices are disposed side by side with the light-emission devices.

20. The electronic unit according to claim 14 , wherein each pixel of the plurality of pixels include a pixel circuit, the pixel circuit including the light-emission device and a drive device, and wherein the light-emission device is located between the one or more transmittance control devices and a substrate of the display.