Display Substrate Antenna Layout for NFC Sensing Without Display Interference
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Solution Overview
Problem
Existing display technologies face challenges in integrating radio frequency identification (RFID) antennas with display substrates, leading to increased complexity, cost, and reduced sensing performance due to separate manufacturing processes and potential interference with display functions.
Innovation Solution
The integration of antenna wiring within the same layer as conductive layers on the display substrate, such as touch electrode layers, with via holes connecting different portions of the antenna wiring, allowing for simplified manufacturing and improved sensing performance while maintaining display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If antenna wiring is integrated in the same layer as conductive layers on the display substrate, then manufacturing complexity is reduced and costs are lowered, but interference with display functions may occur
Solution Approach 1:
The patent positions the antenna wiring in the peripheral area of the display substrate, utilizing the spatial dimension around the display area rather than within it. This dimensional relocation allows the antenna to coexist with display components without interference, while still being integrated into the same manufacturing layers, thus resolving the contradiction between manufacturing simplicity and functional interference.
Solution Approach 2:
The patent applies different functional qualities to different regions of the substrate: the central display area maintains high-quality display functions, while the peripheral area is designated for antenna wiring with RF transmission qualities. This local differentiation allows each region to optimize its specific function without compromising the other, eliminating interference while preserving manufacturing integration.
2Measurement precision
If antenna wiring is positioned closer to the sensing point, then NFC sensing performance is enhanced, but interference with display operations increases
Solution Approach 1:
The patent relocates the antenna wiring to the peripheral dimension of the display substrate, away from the central display area. This spatial repositioning maintains sufficient proximity to the sensing point for effective NFC communication while establishing a dimensional separation that prevents interference with display operations, thus resolving the performance-interference contradiction.
3Object-affected harmful factors
If antenna wiring is arranged around the display area in the peripheral area, then interference with display functions is minimized, but manufacturing complexity increases due to separate processing
Solution Approach 1:
The patent merges the antenna wiring manufacturing process with the existing conductive layer fabrication processes. By integrating the antenna wiring into the same layer structure as touch electrodes and source-drain electrodes, and utilizing the same patterning and deposition techniques, the patent eliminates separate processing steps. This merging approach minimizes manufacturing complexity while maintaining the peripheral arrangement that prevents display interference.
Solution Approach 2:
The patent creates a multi-functional conductive layer structure where the same manufacturing processes produce both display-related conductive elements (touch electrodes, source-drain electrodes) and the antenna wiring. This universal approach allows a single manufacturing workflow to serve multiple functions, reducing overall manufacturing complexity while maintaining the beneficial peripheral antenna arrangement.
Data Source
AI summary
A display substrate has a display area and a peripheral area adjacent to the display area. The display substrate includes; a substrate; an antenna wiring disposed on a side of the substrate; the antenna wiring being located in the peripheral area and arranged around the display area; and at least one conductive layer located on the side of the substrate. The antenna wiring is arranged in a same layer as the at least one conductive layer.