Electronic mirror with automatic luminance and automatic dimming control system

An electronic display mirror comprising:

• a housing attachable to a vehicle, and having an open side;
• an electronic lens assembly disposed in the housing facing the open side, and configured to reflect a rear light incident on the open side at a reflectance rate in response to a reflectance value;
• a rear light sensor attached to the housing facing the open side, and configured to generate a rear intensity value by logarithmic sensing the rear light proximate the electronic lens assembly;
• an ambient light sensor attached to the housing facing away from the open side, and configured to generate an ambient intensity value by logarithmic sensing an ambient light;
• and
• a control circuit disposed in the housing, and configured to generate the reflectance value in response to the ambient intensity value and the rear intensity value, wherein the reflectance value adjusts the reflectance rate of the electronic lens assembly with a negative fractional power of the rear intensity value.

A non-transitory computer readable medium on which is recorded instructions, executable by a processor, for controlled dimming of an electronic mirror, wherein execution of the instructions causes the processor to:

• receive an intensity value from a light sensor, wherein the light sensor is configured to generate the intensity value by logarithmic sensing a light;
• receive an ambient intensity value from an ambient light sensor, wherein the ambient light sensor is configured to generate the ambient intensity value by logarithmic sensing an ambient light;
• generate a reflectance value in response to the ambient intensity value and the intensity value while in a mirror mode;
• and
• transfer the reflectance value to an electronic lens assembly, wherein the reflectance value adjusts a reflectance rate of the electronic lens assembly with a negative fractional power of the intensity value.