Retroreflective modulation label and reader system using light as medium

A retro-reflection, reader-writer technology, applied in the electrical field, can solve problems such as inapplicability to low-power applications, achieve high signal-to-noise ratio and reliability, reduce attenuation speed, and increase reading and writing distance.

Active Publication Date: 2017-10-20
JIANGSU R & D CENTER FOR INTERNET OF THINGS
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  • Abstract
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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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  • Retroreflective modulation label and reader system using light as medium
  • Retroreflective modulation label and reader system using light as medium

Examples

Experimental program
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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 retroreflection modulation label and a reader-writer system with light as the medium, including a label and a reader-writer. Thin film solar panel, retroreflective film for retroreflection, liquid crystal light valve for modulating light reflection, liquid crystal light valve modulation circuit, first photodiode for receiving reader signal, in the Paste the liquid crystal light valve on the retroreflective film. The reader / writer includes an LED for emitting visible light or infrared light, an LED driving and modulating circuit, a microcontroller, and a second photosensitive diode. The advantage of the present invention is that it provides a passive label-label reader system with light as the medium. Thanks to the retroreflective properties of the retroreflective film to light, the attenuation speed of the radio frequency signal is greatly reduced; because the tag uses a thin film solar cell, the read and write distance is increased and the power consumption of the reader is reduced.

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 Patents(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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