0869032-A2 is referenced by 38 patents and cites 2 patents.

An electrochromic rearview mirror system for a vehicle includes an electrochromic reflective element having an electrochromic cell, wherein the reflective element colors to a partial reflectance level in response to a drive signal applied to the cell. The rearview mirror assembly additionally includes a drive circuit which applies a pulsed drive signal to the electrochromic cell in order to establish the partial reflectance level of the reflective element. The drive circuit controls the partial reflectance level as a function of the duty cycle of the pulsed drive signal, which has a pulse repetition rate of at least approximately 10 cycles per second and preferably at least approximately 20 cycles per second. The drive circuit additionally adjusts the amplitude of the pulses as a function of the voltage developed across the electrochromic cell.

Digital electrochromic mirror system
Application Number
EP19980650021 19980402
Publication Number
0869032 (A2)
Application Date
April 2, 1998
Publication Date
October 7, 1998
Schierbeek Kenneth L
B60R 01/08
B60R 01/08
B60R 01/08
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