NFC Sensing Antenna on Display Reflective Plate
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Solution Overview
Problem
The increasing complexity of electronic devices limits the flexibility in placing Near Field Communication (NFC) antennas due to volume design requirements and user operation habits, leading to restricted placement options.
Innovation Solution
A display module incorporating a sensing antenna is designed with a reflective plate and conductive transfer units, allowing the antenna to be disposed on the display surface while minimizing interference from the display panel's capacitance changes, and includes a method to modulate the antenna's frequency or bandwidth to maintain optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the NFC antenna is disposed on the display surface, then the sensing capability is improved, but the antenna is affected by capacitance changes from the display panel
Solution Approach 1:
The patent introduces a matching circuit as an intermediary between the NFC antenna and the display panel capacitance. This matching circuit includes variable capacitors that can be adjusted to compensate for the harmful capacitance changes, thereby maintaining optimal NFC sensing performance while isolating the antenna from direct capacitance interference
Solution Approach 2:
The patent employs variable capacitors in the matching circuit whose capacitance values can be dynamically adjusted. By changing the capacitance parameters of these variable capacitors, the system compensates for the display panel's capacitance changes, maintaining the NFC antenna's resonant frequency and sensing accuracy despite the varying electrical environment
2Adaptability or versatility
If the antenna is disposed on the reflective plate, then the placement flexibility is improved, but the signal transfer efficiency may be affected
Solution Approach 1:
The patent introduces conductive transfer units as intermediary elements between the NFC antenna on the reflective plate and the system circuit module. These conductive transfer units ensure reliable signal and power transmission while allowing the antenna to be flexibly positioned on the reflective plate surface, thus maintaining both placement flexibility and signal transfer efficiency
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 design enables effective sensing and data transfer while reducing interference, allowing the NFC antenna to operate efficiently and maintain its original frequency band, even when subjected to changes in capacitance from the display panel.
Implementation Method 1
modulating the capacitance of a variable capacitor of the matching circuit in accordance with the signal to make a frequency or a bandwidth of the sensing antenna back to an original working frequency band
Data Source
AI summary
An electronic device and a display module used therein are provided. The display module includes a display panel, a backlight module and a sensing antenna. The backlight module has a light exit surface and a reflective plate opposite to the light exit surface, and the display panel is stacked on the light exit surface. The sensing antenna is disposed on a surface of the reflective plate opposite to the light exit surface and has a body and two signal connecting terminals connecting the body. The electronic device includes the display module, a system circuit module, and a conductive device. The system circuit module is disposed on a back side of the display module and has a signal connecting parts corresponding to and connecting the signal connecting terminals.