Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1998-09-21
1999-11-02
Epps, Georgia
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359275, 351 44, G02F 1163
Patent
active
059781262
ABSTRACT:
An apparatus for controlling a charge state of an electrochromic devices according to the invention, where the electrochromic devices receives a charging current, comprises: a reference impedance, coupled to receive a reference current proportional to the charging current, the reference impedance having a known impedance relationship with the electrochromic device; a comparator, coupled to the reference impedance, for comparing a voltage level of the reference impedance to a threshold voltage level and producing an output signal indicative of the comparison; and control logic, coupled to the comparator, for simultaneously adapting the reference current and the charging current in response to the output signal of the comparator. In one embodiment of the invention, the apparatus is included within a pair of eyeglasses.
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Copending U.S. application Ser. No. 09/157,723 entitled "Method and Apparatus for Controlling an Electrochromic Device", filed Sep. 21, 1998, by Walter P. Sjursen, et al.
U.S. Pat. application Ser. No. 09/157,725 entitled "Method and Apparatus for Controlling an Electrochromic Device", filed Sep. 21, 1998, by Timothy A. Pletcher, et al.
U.S. Pat. application Ser. No. 09/046,386 entitled "Method for Forming a Molded Edge Seal", filed Mar. 23, 1998, by John E. Smarto, et al.
Burke Margaret
Epps Georgia
Mitchell William C.
PPG Industries Ohio Inc.
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