Display system and display device
A display device includes a housing, a variable reflectance element, a display to display at least a portion of a rearward image, a display device control circuit, and an actuator to switch the variable reflectance element between first and second postures. In the first posture, the display displays the portion of the rearward image. In the second posture, the display displays the rearward image. In the second posture, the reflectivity of the incident light varies between first and second values of a first and a second illuminance, respectively. The first illuminance indicates brightness around a vehicle and is detected by a sensor. The second illuminance indicates intensity of light emitted on a front surface of the display device and is detected by another sensor. When the display displays at least the portion of the rearward image, the display is visible to a driver through the variable reflectance element.
1. A display device placeable within an interior of a vehicle, the display device comprising:
a housing;
an electro-optic layer configured to vary reflectivity of incident light, to transmit a portion of the incident light, and to reflect another portion of the incident light;
a display configured to display at least a portion of a rearward image;
a display device control circuit configured to control operation of the display device; and
an actuator provided in the housing and configured to switch the electro-optic layer between a first posture and a second posture, wherein
the display is configured to display at least the portion of the rearward image when the electro-optic layer is in the first posture,
the display is configured not to display the rearward image when the electro-optic layer is in the second posture,
the reflectivity of the incident light varies between at least two values including a first value and a second value based on a value of at least one of a first illuminance and a second illuminance when the electro-optic layer is in the second posture, the second value being larger than the first value,
the reflectivity of the incident light is equal to or more than the second value when the electro-optic layer is in the first posture,
the first illuminance indicates brightness around the vehicle and is detected by a first illuminance sensor,
the second illuminance indicates intensity of light emitted on a front surface of the display device and is detected by a second illuminance sensor, and
the display is visible to a driver of the vehicle through the electro-optic layer when the display displays at least the portion of the rearward image.
2. The display device according to claim 1 , wherein
the electro-optic layer includes a transmissive-reflective layer,
the first posture is a posture that the driver of the vehicle views rearward of the vehicle by at least the portion of the rearward image displayed on the display, and
the second posture is a posture that the driver views rearward of the vehicle by way of a mirror image that appears on the transmissive-reflective layer.
3. The display device according to claim 1 , wherein the actuator switches the electro-optic layer between the first posture and the second posture by changing a posture of the housing.
4. The display device according to claim 1 , wherein the actuator is coupled to the electro-optic layer and switches the electro-optic layer between the first posture and the second posture without changing a posture of the housing.
5. The display device according to claim 1 , comprising the first illuminance sensor and the second illuminance sensor, wherein
the housing has a front side and a rear side,
the first illuminance sensor is provided on the rear side of the housing, and
the second illuminance sensor is provided adjacent an opening on the front side of the housing.
6. The display device according to claim 1 , wherein the display is coupled to an image capture device that captures the rearward image via a network.
7. The display device according to claim 1 , further comprising a electro-optic layer control circuit configured to control operation of the electro-optic layer, wherein
the electro-optic layer control circuit controls the reflectivity of the electro-optic layer by varying a value of a voltage applied to the variable reflectance element when the electro-optic layer is in the second posture, and
the electro-optic layer control circuit does not control the reflectivity of the vaelectro-optic layer when the electro-optic layer is in the first posture.
8. The display device according to claim 7 , wherein the electro-optic layer control circuit controls the reflectivity of the electro-optic layer to change between at least three values when the electro-optic layer is in the second posture.
9. The display device according to claim 1 , wherein the electro-optic layer includes an electrochromic layer and a transmissive-reflective layer.
10. The display device according to claim 1 , wherein the actuator is a lever.
11. A display system that is placeable in a vehicle, the display system comprising:
an image capture device that captures a rearward image of the vehicle;
a display device that is coupled to the image capture device, and receives at least a portion of the rearward image captured by the image capture device; and
a first illuminance sensor and a second illuminance sensor,
wherein the display device includes:
a housing;
an electro-optic layer configured to vary reflectivity of incident light, to transmit a portion of the incident light, and to reflect another portion of the incident light;
a display configured to display at least the portion of the rearward image;
a display device control circuit configured to control operation of the display device; and
an actuator provided in the housing and configured to switch the electro-optic layer between a first posture and a second posture, wherein
the display is configured to display at least the portion of the rearward image when the electro-optic layer is in the first posture,
the display is configured not to display the rearward image when the electro-optic layer is in the second posture,
the reflectivity of the incident light varies between at least two values including a first value and a second value based on a value of at least one of a first illuminance and a second illuminance when the electro-optic layer is in the second posture, the second value being larger than the first value,
the reflectivity of the incident light is equal to or more than the second value when the electro-optic layer is in the first posture,
the first illuminance indicates brightness around the vehicle and is detected by the first illuminance sensor,
the second illuminance indicates intensity of light emitted on a front surface of the display device and is detected by the second illuminance sensor, and
the display is visible to a driver of the vehicle through the electro-optic layer when the display displays at least the portion of the rearward image.
12. The display system according to claim 11 , wherein
the electro-optic layer includes a transmissive-reflective layer,
the first posture is a posture that the driver of the vehicle views rearward of the vehicle by at least the portion of the rearward image displayed on the display, and
the second posture is a posture that the driver views rearward of the vehicle by way of a mirror image that appears on the transmissive-reflective layer.
13. The display system according to claim 11 , wherein the actuator switches the electro-optic layer between the first posture and the second posture by changing a posture of the housing.
14. The display system according to claim 11 , wherein the actuator is coupled to the electro-optic layer and switches the electro-optic layer between the first posture and the second posture without changing a posture of the housing.
15. The display system according to claim 11 , wherein
the housing has a front side and a rear side,
the first illuminance sensor is provided on the rear side of the housing, and
the second illuminance sensor is provided adjacent an opening on the front side of the housing.
16. The display system according to claim 11 , wherein
the first illuminance sensor is provided in a body of the vehicle, and
the first illuminance sensor and the display device are coupled via a vehicle network.
17. The display system according to claim 11 , further comprising an electro-optic layer control circuit configured to control operation of the electro-optic layer, wherein
the electro-optic layer control circuit controls the reflectivity of the electro-optic layer by varying a value of a voltage applied to the variable reflectance element when the electro-optic layer is in the second posture, and
the electro-optic layer control circuit does not control the reflectivity of the electro-optic layer when the electro-optic layer is in the first posture.
18. The display system according to claim 17 , wherein the electro-optic layer control circuit controls the reflectivity of the electro-optic layer to change between at least three values when the electro-optic layer is in the second posture.
19. The display system according to claim 11 , wherein the electro-optic layer includes an electrochromic layer and a transmissive-reflective layer.
20. The display system according to claim 11 , wherein the actuator is a lever.