| 摘要 |
The device has a control element that generates an activation signal in response to a light detection signal during a first activation time in response to a high frequency detection signal to generate a control regulation signal after the passage of a first activation period and initiates standby mode if the light detection and high frequency signals do not exist. The device has a liquid crystal field, a solar battery circuit outputting two voltages a charge current circuit for producing a control voltage, an oscillator circuit, a high voltage amplifier for charge pumping the control voltage to produce a high voltage, a regulator for the high voltage, an generator of an activation voltage for the liquid crystal field, a control circuit power regulator, a light detector, a high frequency detector, a liquid crystal activation stage, a liquid crystal control stage and a control element. The control element generates an activation signal in response to a light detection signals during a first activation time in response to a high frequency detection signal to generate the control regulation signal after the passage of the first activation period and initiates standby mode if light detection and high frequency signals do not exist.
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