发明名称 |
Reflectance control of an electrochromic element using a variable duty cycle drive |
摘要 |
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.
|
申请公布号 |
US6084700(A) |
申请公布日期 |
2000.07.04 |
申请号 |
US19980067977 |
申请日期 |
1998.04.29 |
申请人 |
GENTEX CORPORATION |
发明人 |
KNAPP, ROBERT CHARLES;TURNBULL, ROBERT RALPH;POE, GERALD BRUCE |
分类号 |
G02F1/163;(IPC1-7):G02F1/163 |
主分类号 |
G02F1/163 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|