RFID Tag Sensor Display for Product Condition Monitoring
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Solution Overview
Problem
RFID tags lack the ability to monitor and display transient states or conditions of products, such as freshness or expiration dates, in a visual and timely manner, limiting their effectiveness in inventory management and other applications.
Innovation Solution
Incorporating a sensor and display into RFID tags that compare received read signals with generated values to provide visual indications of product conditions, using LEDs or other displays to indicate freshness, nearing expiration, or expiration status, and extending this functionality to other product characteristics like weight, moisture, and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If RFID tags incorporate sensors and displays to monitor and show transient states, then information availability and monitoring capability are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions (RFID communication, sensing, and display) into a single integrated tag device. The sensor module detects product conditions while the display module visually presents this information, and both are coordinated by the tag's processor, eliminating the need for separate monitoring devices and reducing overall system complexity despite adding capabilities to the tag.
Solution Approach 2:
The RFID tag is designed to perform multiple functions: traditional identification and tracking, plus transient state monitoring through integrated sensors, and visual information display. This multi-functional approach allows a single device to replace multiple separate systems, improving information availability while managing complexity through functional integration.
2Loss of information
If RFID tags continuously monitor and display transient states, then real-time information availability is improved, but energy consumption increases
Solution Approach 1:
The tag monitors transient states at periodic intervals triggered by RFID read signals from readers, rather than continuously. The display updates based on these periodic measurements, allowing the tag to conserve energy by remaining in a low-power state between readings while still providing timely condition information when queried by the RFID system.
Solution Approach 2:
The system implements feedback through the RFID communication loop, where the tag responds to read signals by providing condition information. This feedback mechanism allows the tag to operate on-demand based on system needs, balancing real-time information requirements with energy conservation by only activating sensors and displays when information is actually requested.
3Measurement precision
If RFID tags include comparison logic and multiple display indicators, then measurement precision and condition detection capability are improved, but device complexity increases
Solution Approach 1:
The tag's processing logic is segmented into distinct functional modules: sensor input processing, comparison logic for threshold evaluation, and display control logic. Each module handles a specific aspect of condition monitoring, making the overall complex system manageable through modular design while maintaining precise measurement and detection capabilities.
Solution Approach 2:
The display uses color-coded indicators (e.g., different colored LEDs) to represent different condition states. This visual encoding system provides precise condition information through simple, intuitive color changes rather than complex numerical displays, improving measurement precision while minimizing the complexity of the display hardware and control logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time monitoring and visual feedback on product conditions, enhancing inventory management and other applications by providing clear, actionable information on product freshness and other parameters.
Implementation Method 1
An RFID tag includes a sensor for determining a transient state or condition of a product to which the tag is associated
Implementation Method 2
If the product is fresh, a first color LED is actuated. If the product is nearing its expiration date, a second color LED is actuated. If the product is out-of-date, a third color LED is actuated.
Data Source
AI summary
An RFID tag includes a sensor for determining a transient state or condition of a product to which the tag is associated, and a display. The tag may be passive, semi-passive, or active. In response to receipt at the tag of a read signal that includes a first value associated with the transient state or condition, a comparison is performed. The comparison compares the first value, with a second value generated by the sensor in response to receipt of the read signal. As a result of the comparison, an indication is provided on the display. The information displayed is a function of the comparison. In one embodiment, the display provides different color indications depending on the transient state or condition sensed.