Patent ID: 6547404
Filing Date: 2003-04-15
Classification: B60R

Abstract:
A vehicular digital electrochromic mirror system, comprising:an interior mirror assembly and at least one exterior mirror assembly, said interior mirror assembly comprising an interior electrochromic reflective element and a control, said at least one exterior mirror assembly comprising an exterior electrochromic reflective element; said control comprising at least one light sensor and a microcomputer, said microcomputer establishing an interior reflectance value established by a first pulse-width modulated signal for said interior reflective element and an exterior reflectance value established by a second pulse-width modulated signal for said exterior reflective element, said interior reflective element achieving a partial reflectance level in response to the interior reflectance value, said exterior reflectance element achieving a partial reflectance level in response to the exterior reflectance value; a vehicle bus communicating the exterior reflectance value to said exterior reflective element; said interior mirror assembly comprising at least one additional accessory; and said first and second pulse-width-modulated signals determined by: PWM %=G(Csâˆ’V) â€ƒwhere PWM % is a value of the respective one of said first and second pulse-width-modulated signals expressed as a percentage, G is a constant, Cs is a voltage at which the respective one of said interior and exterior reflective elements begins coloration, and V is a value of an output of said at least one light sensor.