Backward reflecting modulation tag with light as medium and reader-writer system
A retroreflective, reader-writer technology, applied in the electrical field, can solve the problems of not being suitable for low-power applications, achieve high signal-to-noise ratio and reliability, reduce attenuation speed, and increase the reading and writing distance
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[0011] The present invention will be further described below in conjunction with drawings and embodiments.
[0012] The present invention is a system composed of a pair of tag-tag reader-writers using light (including visible light and infrared light) as the communication medium, such as figure 1 shown.
[0013] The tag contains a thin film solar panel 1 for harvesting energy from the light emitted by the reader and ambient light, a retroreflective film 2 for retroreflection, a liquid crystal for modulating the reflection of light Light valve 3, liquid crystal light valve modulation circuit, first photodiode 4 for receiving reader-writer signal, paste liquid crystal light valve 3 on said retroreflection film 2, said liquid crystal light valve 3 is connected to liquid crystal light valve modulation circuit, the first photosensitive diode 4 is connected with supporting amplification, filtering and demodulation circuits.
[0014] The reader includes an LED 5 for emitting visibl...
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