05550677 is referenced by 732 patents and cites 80 patents.

A system apparatus, structure and method for controlling a plurality of variable reflectance mirrors (or mirror segments), including a rearview mirror and side view mirrors, which change their reflectance level in response to a plurality of drive voltages applied thereto, for an automotive vehicle. The system includes a light sensing device and a control circuit formed as a single VLSI CMOS circuit. The light sensing device comprises a photosensor array having a field of view encompassing a rear window area and at least a portion of at least one side window area of the vehicle. The logic and control circuit determines a background light signal from photosensor element signals generated by the photosensor elements in the photosensor array indicative of light levels incident on the photosensor elements. The circuit also determines a peak light signal in three different zones or sub-arrays of the photosensor array. The zones or sub-arrays may correspond to three mirrors or mirror segments. The peak light signals in each of the zones and a common background light signal are used to determine independent and separate control signals, which are then output to separate mirror drive circuits for independently controlling the reflectance level of the rearview mirror and the left and right side view mirrors, or alternatively the segments of a mirror.

Title
Automatic rearview mirror system using a photosensor array
Application Number
8/23918
Publication Number
5550677
Application Date
February 26, 1993
Publication Date
August 27, 1996
Inventor
Mark Larson
Grand Haven
MI, US
Kenneth Schofield
Holland
MI, US
Agent
Fitzpatrick Cella Harper & Scinto
Assignee
Donnelly Corporation
MI, US
IPC
G02B 27/00
G02B 5/08
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