Passive RFID Module Touch Signal Differentiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current RFID technologies face challenges in seamlessly integrating touch sensing capabilities with RFID communication, particularly in distinguishing between RFID reader interactions and human or accessory touch events on touch panels, which limits the operational modes and efficiency of RFID-based devices.
Innovation Solution
The integration of a passive RFID module with a touch sensing element and an RFID reader sensing element, electrically coupled to a controller, allows the system to operate in multiple modes by differentiating between RFID reader interactions and touch events based on signal characteristics, enabling efficient data transfer and touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a passive RFID module is integrated with touch sensing capabilities, then the device can perform both RFID communication and touch detection, but the system cannot distinguish between RFID reader interactions and human touch events
Solution Approach 1:
The patent divides the signal detection function into two separate sensing elements: an RFID reader sensing element and a touch sensing element. Each element is optimized for its specific function, allowing the system to distinguish between RFID reader interactions and human touch events by analyzing which element detects the signal first or with greater strength.
Solution Approach 2:
The patent introduces a controller as an intermediary that receives signals from both the RFID reader sensing element and the touch sensing element. The controller analyzes the characteristics and timing of signals from both elements to determine whether the interaction is with an RFID reader or a human touch, enabling accurate differentiation between the two input types.
2Measurement precision
If separate sensing elements are used for RFID and touch detection, then signal differentiation is improved, but device complexity increases
Solution Approach 1:
The patent combines the passive RFID module with both the RFID reader sensing element and the touch sensing element into a single integrated system. This merging allows the system to achieve accurate signal differentiation through multiple sensing elements while maintaining a compact structure where all components work together cooperatively under a single controller.
Solution Approach 2:
The passive RFID module serves multiple functions: it acts as the RFID target for communication and simultaneously functions as part of the touch sensing system. This multi-functionality reduces the need for completely separate systems while maintaining the ability to distinguish between RFID and touch interactions through the combined sensing elements.
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
This solution enhances the operational flexibility and accuracy of RFID-based devices by allowing them to function in various modes, including passive RFID, touch sensing, data transfer, and interrogation, while providing reliable touch detection and data management.
Implementation Method 1
RFID refers to a technology that allows devices to communicate with one another using electromagnetic fields to induce current flow at a distance
Implementation Method 2
If a person's finger or a touch panel accessory comes close to or touches the passive RFID module, the passive RFID module reacts by transmitting a second type of signal
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A touch sensor and RFID apparatus is described. In one implementation, the apparatus includes a passive RFID module (104) disposed proximate to a touch panel (125) and a control module (102) configured to receive an electrical signal from the passive RFID module (104). The apparatus may be configured to determine, based on a characteristic of the electrical signal, whether the passive RFID module (104) has been energized by an RFID reader or, in the alternative, has exhibited an impedance change as a result of contact being made with the touch panel (125). The apparatus may also be configured to operate in a first mode if the passive RFID module (104) is determined to have been energized by an RFID reader, or, in the alternative, operate in a second mode if the passive RFID module (104) is determined to have been energized as a result of contact being made with the touch panel (125). Additionally, the control module (102) can read from or write to the passive RFID module (104) via direct electrical excitation over a wire or wires connecting the passive RFID module (104) to the control module (102).