NFC Antenna Array Behind Display Panel
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Solution Overview
Problem
Existing NFC systems face challenges in maintaining communication quality due to reduced magnetic field intensity and interference when antennas are wound around display panels, and they struggle with multitasking efficiency as they can only communicate with one device at a time.
Innovation Solution
A NFC system with multiple circular antennas disposed behind a display panel, each coupled to an RF module, allowing for improved magnetic field coverage and simultaneous communication with multiple devices without degrading display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the antenna area is increased to improve magnetic field intensity, then the magnetic field coverage is improved, but the display quality degrades due to interference
Solution Approach 1:
The patent divides the single large antenna into multiple smaller antennas arranged in an array. Each antenna element has a smaller area that does not interfere with display quality, while the collective array provides sufficient magnetic field coverage. The segmentation allows each element to be optimized for NFC performance without compromising display performance.
Solution Approach 2:
The patent transitions from a single planar antenna to a multi-element antenna array, adding spatial dimensionality to the NFC field generation. This dimensional expansion allows the system to achieve improved magnetic field coverage through constructive interference of multiple elements while maintaining small individual element sizes that do not interfere with the display.
2Device complexity
If a single antenna is used to simplify the system, then the device complexity is reduced, but the multitasking efficiency deteriorates as only one device can communicate at a time
Solution Approach 1:
The patent segments the communication function across multiple antenna elements, allowing simultaneous or rapid sequential communication with multiple devices. Each antenna element can serve as an independent communication channel, enabling the system to handle multiple NFC devices concurrently or switch between them rapidly, thereby improving multitasking efficiency.
Solution Approach 2:
The antenna array provides multi-functionality by enabling simultaneous support for multiple communication channels. The system can simultaneously serve multiple NFC devices or rapidly switch between them, making the antenna system universal in its ability to handle various communication scenarios including single-device and multi-device interactions.
3Length of stationary object
If the current through the antenna is increased to improve magnetic field intensity, then the communication range is extended, but the interference with electronic components increases
Solution Approach 1:
The patent distributes the total current requirement across multiple antenna elements rather than concentrating it in a single antenna. Each element carries a fraction of the total current, reducing the current-induced interference with electronic components while maintaining adequate magnetic field intensity through the combined effect of all elements.
Solution Approach 2:
The patent changes the system parameters from a single high-current antenna to multiple low-current antennas. By distributing the current load across multiple elements, the system achieves the same magnetic field intensity with lower individual current levels, thereby reducing electromagnetic interference with nearby electronic components while maintaining communication range.
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
Enhances communication quality by increasing the coupling coefficient and reducing interference, enabling efficient multitasking by allowing multiple devices to communicate simultaneously.
Implementation Method 1
The card reader generates an alternating magnetic field by its coil antenna, and the coil antenna of the RFID card inductively couples the alternating magnetic field to generate the electric power required for operation of the circuit within the RFID card
Implementation Method 2
the coil antenna of the RFID card inductively couples the alternating magnetic field to generate the electric power required for operation
Data Source
AI summary
A near field communication (NFC) system and an associated apparatus are provided. The NFC system includes a display device, a host computer, at least one RF module coupled to the host computer, a plurality of antennas coupled to the at least one RF module, and a NFC device. The antennas are disposed behind the display device. The NFC device is for communicating with the host computer via one of the antennas. The NFC system can upgrade communication quality and achieve multi-tasking efficiency.