Reflectance control of an electrochromic element using a variabl

Details Reflectance control of an electrochromic element using a variabl Reflectance control of an electrochromic element using a variabl

1998-04-29

2000-07-04

Sugarman, Scott J.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359267, 359603, 359604, G02F 1163

Patent

active

06084700&

ABSTRACT:
An electronic circuit for an electrochromic element. In order to improve the response time of the electrochromic element and reduce the cost and complexity, a modulated signal, such as a pulse width modulated (PWM) signal is coupled to the electrochromic element without signal averaging. In order to compensate for the compressed operating range of the reflectance characteristic under such conditions, the electronic circuit in accordance with the present invention utilizes active loading or alternatively voltage feedback of the electrochromic element to provide a reflectance response characteristic with an uncompressed linear operating range similar to a reflectance characteristic for an electrochromic element with a DC drive circuit.

REFERENCES:
patent: 4060975 (1977-12-01), Yamaguchi
patent: 4074256 (1978-02-01), Sekiya et al.
patent: 4096412 (1978-06-01), Sekiya
patent: 4516120 (1985-05-01), Sakuyama
patent: 5076673 (1991-12-01), Lynam et al.
patent: 5486952 (1996-01-01), Nagao et al.

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