Reflective display apparatus
A reflective display apparatus includes an image display panel including a liquid crystal panel and a backlight unit, a half mirror, and an electrochromic panel arranged in a layered manner. When the image display panel stops operating and power supply to the electrochromic panel is stopped, the half mirror reflects light coming from the rear of a vehicle and the reflected light is directed rearward. The reflected light enables a driver to check a situation behind the vehicle under such conditions.
1. A reflective display apparatus comprising:
an image display panel;
an electrochromic panel disposed adjacent to a display side of the image display panel;
a half mirror disposed between the image display panel and the electrochromic panel;
a controller that controls the image display panel and the electrochromic panel; and,
a photodetector that senses external light;
wherein when the photodetector senses a light intensity below a predetermined value, the controller performs first control to drive the image display panel without applying a voltage across electrodes of the electrochromic panel; and,
wherein when the photodetector senses a light intensity at or above the predetermined value, the controller performs second control to apply the voltage across the electrodes of the electrochromic panel without driving the image display panel.
2. The apparatus according to claim 1 ,
wherein the electrochromic panel includes
two opposed transparent substrates,
a transparent electrode disposed on an inner surface of each of the transparent substrates, and
an electrolyte layer interposed between the opposed transparent electrodes, the electrolyte layer containing a metal ion, and
wherein the metal ion is deposited on one of the transparent electrodes in response to application of voltage across the transparent electrodes, so that the electrochromic panel becomes a reflective panel.
3. The apparatus according to claim 1 , wherein the half mirror has a reflectance of 10% to 40%.
4. The apparatus according to claim 1 , further comprising:
a camera that captures an image of an area behind a vehicle,
wherein the image display panel is capable of displaying the captured image of the area behind the vehicle.
5. The apparatus according to claim 1 , wherein when application of the voltage across the electrodes of the electrochromic panel is stopped during the second control, the controller continues a state in which the image display panel is not driven.