Control circuit and method for maintaining light transmittance of electrochromic device
a control circuit and light transmittance technology, applied in non-linear optics, instruments, optics, etc., can solve the problems of affecting the material of the electrochromic device is not suitable for special glass, etc., to achieve the effect of maintaining the light transmittance of the electrochromic device effectively
Active Publication Date: 2015-12-10
REDOXLENS CO LTD
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Benefits of technology
The solution enables efficient control of light transmittance and coloration time, preventing deepening of the colored state and maintaining optimal light transmittance by regulating the power supply based on detected current and voltage levels, thereby improving the electrochromic device's performance.
Problems solved by technology
However, the longer the voltage is applied, the more ions are transferred and the darker the electrochromic material is.
Thus the electrochromic materials are not suitable for special glass on vehicles that requires good transmittance.
Method used
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[0026]Refer to FIG. 1, a control circuit for maintaining light transmittance of an electrochromic device (ECD) includes an input power source 1, a color switch 2, at least one current detecting unit 3, at least one electrochromic device (ECD) 4 and at least one voltage detecting unit 5. An electrode of the input power source 1 is electrically connected to the color switch 2 while the color switch 2 is electrically connected to the current detecting unit 3. The current detecting unit 3 is electrically connected to one electrode of the electrochromic device 4 and the voltage detecting unit 5 is electrically connected to and arranged between two electrodes of the electrochromic device 4.
[0027]After the color switch 2 being turned on, the input power source 1 provides the electrochromic device 4 a coloring power source. Thus the electrochromic device 4 starts coloration. When the current detecting unit 3 detects that the value of coloring current of the coloring power source for the ele...
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Abstract
A control circuit and a method for maintaining light transmittance of an electrochromic device are revealed. An input power source is turned off once a current input into an electrochromic device is decreased to a preset value. Then a voltage between two electrodes of the electrochromic device is detected. When the voltage between two electrodes of the electrochromic device is dropped to a preset value, the input power source is restored. According to the above steps, the coloration of the electrochromic device is maintained within a preset range. Thus light transmittance of the electrochromic device is kept at a certain range.
Description
BACKGROUND OF THE INVENTION[0001]1. Fields of the Invention[0002]The present invention relates to a control circuit and a method, especially to a control circuit and a method for maintaining light transmittance of an electrochromic device.[0003]2. Descriptions of Related Art[0004]By applying an external voltage, materials have the possibility to change their color reversibly. The materials are called electrochromic materials. Electrochromic materials have the property of color changing due to electrochemical redox reactions. They are transformed in a different charged state to obtain a different color. Thus the optical properties (color or transmittance) of the electrochromic device can be adjusted by the voltage applied. After being driven by a lower voltage, the electrochromic device is switched to a colored state. When the external voltage is off, ions are diffused slowly away from the active electrochromic layer. Thus the electrochromic device is switched to a bleached state. By...
Claims
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IPC IPC(8): G02F1/163G02F1/155
CPCG02F1/155G02F1/163
Inventor CHUNG, YI-WENLIN, CHIH-CHING
Owner REDOXLENS CO LTD