Digital electrochromic mirror system
First Claim
1. A vehicular electrochromic rearview mirror system, comprising:
- a master electrochromic rearview mirror assembly having a master electrochromic reflective element;
a slave electrochromic rearview mirror assembly having a slave electrochromic reflective element;
a master drive circuit supplying a master drive signal for said master reflective element;
a slave drive circuit supplying a slave drive signal for said slave reflective element;
said slave reflective element reaches a particular reflectance level in response to a duty cycle of a pulse-width modulated signal;
said slave drive circuit supplying said slave drive signal at a particular duty cycle of a pulse-width modulated signal taking into account a current reflectance level of said master reflective element as controlled by a microcomputer.
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Accused Products
Abstract
A vehicular electrochromic rearview mirror system includes an interior electrochromic rearview mirror assembly and at least one exterior electrochromic rearview mirror assembly. Each mirror assembly includes an electrochromic reflective element that assumes a partial reflectance level in response to a signal applied thereto. A drive circuit applies a drive signal to each of the electrochromic reflective elements. The drive circuit may include a digital controller, a master drive circuit responsive to the digital controller to apply a first drive signal to one of the electrochromic reflective elements and a slave drive circuit responsive to the digital controller to apply a second drive signal to a second of the electrochromic reflective elements. The second drive signal may be derived from the first drive signal. The drive circuit may include a digital controller and a switching power supply controlled by the digital controller to produce a drive signal.
55 Citations
16 Claims
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1. A vehicular electrochromic rearview mirror system, comprising:
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a master electrochromic rearview mirror assembly having a master electrochromic reflective element;
a slave electrochromic rearview mirror assembly having a slave electrochromic reflective element;
a master drive circuit supplying a master drive signal for said master reflective element;
a slave drive circuit supplying a slave drive signal for said slave reflective element;
said slave reflective element reaches a particular reflectance level in response to a duty cycle of a pulse-width modulated signal;
said slave drive circuit supplying said slave drive signal at a particular duty cycle of a pulse-width modulated signal taking into account a current reflectance level of said master reflective element as controlled by a microcomputer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification