Display Module NFC Antenna Integration Without Added Thickness
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Solution Overview
Problem
The existing methods for attaching NFC antennas to mobile phone shells increase the thickness of the phone, which is a design constraint.
Innovation Solution
The display module integrates an NFC antenna by utilizing the bonding impedance test circuit on the display substrate and flexible printed circuit board, allowing the antenna radiation structure and receiving structure to form an NFC antenna without increasing the thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a steel patch antenna or LDS antenna is attached to the mobile phone shell, then the antenna function is achieved, but the thickness of the phone increases
Solution Approach 1:
The patent combines the NFC antenna radiation structure and receiving structure directly into the bonding region of the display module, merging the antenna function with the existing bonding structure. This eliminates the need for separate antenna components attached to the phone shell, thereby achieving the antenna function without increasing phone thickness.
Solution Approach 2:
The bonding region structure is designed to serve multiple functions: it provides the bonding connection between display substrate and flexible printed circuit board, and simultaneously houses the NFC antenna radiation structure and receiving structure. This multi-functionality allows the same structural region to fulfill both mechanical bonding and electromagnetic radiation/reception functions without adding extra thickness.
2Length of moving object
If the bonding impedance test circuit is used as NFC antenna, then the antenna function is realized without increasing thickness, but the circuit design becomes more complex
Solution Approach 1:
The bonding impedance test circuit is designed to serve dual purposes: it performs the original function of bonding impedance testing during manufacturing, and simultaneously functions as the NFC antenna circuit during operation. The radiation structure and receiving structure are integrated into this existing circuit path, allowing the same circuit to fulfill both testing and antenna functions without requiring separate dedicated antenna circuits.
Solution Approach 2:
The bonding impedance test circuit is made self-sufficient by integrating both the radiation structure and receiving structure directly into it. The circuit uses its own existing impedance testing pathway to achieve NFC antenna functionality, eliminating the need for separate antenna circuits or additional components. The circuit serves itself as both the testing mechanism and the antenna system.
Data Source
AI summary
The disclosure provides a display module, including a display substrate and a FPC board; the display substrate includes a first base substrate, first bonding terminals, first impedance-test bonding terminals, and an antenna radiation structure; the FPC board includes a second base substrate, second bonding terminals, second impedance-test bonding terminals, and an antenna receiving structure; the first bonding terminals are bonded and connected to the second bonding terminals; the first impedance-test bonding terminals are bonded and connected to the second impedance-test bonding terminals; the antenna radiation structure has two ends respectively connected to two first impedance-test bonding terminals; the antenna receiving structure has two ends respectively connected to two second impedance-test bonding terminals; and the two first impedance-test bonding terminals connected to the antenna radiation structure are respectively bonded and connected to the two second impedance-test bonding terminals connected to the antenna receiving structure in one-to-one correspondence.


