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

Active Publication Date: 2015-06-17
JIANGSU R & D CENTER FOR INTERNET OF THINGS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional visible light communication solutions focus on improving bandwidth and speed, which are not suitable for low-power applications and cannot be applied in passive situations.

Method used

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  • Backward reflecting modulation tag with light as medium and reader-writer system
  • Backward reflecting modulation tag with light as medium and reader-writer system

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Embodiment Construction

[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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Abstract

The invention relates to a backward reflecting modulation tag with light as a medium and a reader-writer system. A tag body and a reader-writer are included. The tag comprises a thin film solar cell panel which is used for obtaining energy from light emitted by the reader-writer and ambient light, a backward reflecting thin film for backward reflecting, a liquid crystal light valve for carrying out modulation on light reflecting, a liquid crystal light valve modulation circuit and a first photosensitive diode for receiving reader-writer signals. The liquid crystal light valve adheres to the backward reflecting thin film. The reader-writer comprises an LED for emitting visible light or infrared light, an LED driving and modulation circuit, a microcontroller, and a second photosensitive diode. The backward reflecting modulation tag has the advantages that the passive tag-tag reader-writer system with light as the medium is provided, through the backward reflecting features of the backward reflecting thin film on light, compared with radio-frequency signals, the decay rate is greatly lowered, the tag body uses the thin film solar cell, reading-writing distance is improved, and the power consumption of the reader-writer is lowered.

Description

technical field [0001] The invention relates to a retroreflection modulation passive label-reading system with light as the medium, which belongs to the field of electricity. Background technique [0002] Traditional passive tag-reader systems are generally based on radio frequency identification (RFID). RFID is a non-contact automatic identification technology. Its working principle is that the reader emits a wireless electromagnetic wave of a specific frequency to drive the approaching electronic tag to send its internal data. At this time, the reader receives and interprets the data. Send it to the application program for corresponding processing. The tag obtains energy through the coupling of the RF signal emitted by the reader, and by modulating its own impedance, modulates the RF carrier emitted by the reader and reflects it back to the reader. Therefore, the tag does not need to transmit radio frequency signals independently, which greatly reduces the power consumpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K17/00
Inventor 李江涛王卫东陈岚
Owner JIANGSU R & D CENTER FOR INTERNET OF THINGS
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