Touch Display NFC Antenna Layout to Avoid Signal Blocking
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Solution Overview
Problem
In display devices with integrated touch sensors and near field communication antennas, the antenna's communication accuracy is hindered by the touch panel layer, which blocks communication radio waves.
Innovation Solution
The touch sensor and near field communication antenna are formed in the same layer on the display surface side of the display panel, with the antenna wire coiled in the peripheral area to avoid obstruction by the touch panel, ensuring unblocked communication and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna is placed between the touch panel layer and display panel layer, then the device structure is compact and integrated, but the touch panel layer blocks communication radio waves and reduces communication accuracy
Solution Approach 1:
The antenna is extracted from the conventional position between the touch panel and display panel, and relocated to the outer surface of the display panel. This extraction removes the antenna from the blocked position, allowing radio waves to communicate without passing through the touch panel layer, thereby resolving the contradiction between structural integration and communication reliability
Solution Approach 2:
The antenna positioning changes from a layered internal structure (between touch panel and display panel) to an external surface structure (on the outer surface of the display panel). This dimensional relocation allows the antenna to operate in a space not blocked by the touch panel, maintaining structural compactness while improving communication accuracy
2Reliability
If the antenna is placed on the outer surface of the display panel in the same layer as the touch electrode, then communication accuracy is improved by avoiding touch panel obstruction, but the antenna may interfere with touch sensor operation
Solution Approach 1:
The outer surface layer is segmented into functionally independent regions: the touch electrode area for touch sensing and the antenna area for wireless communication. This spatial segmentation allows both functions to operate simultaneously without significant interference, as the touch panel layer no longer blocks antenna signals while the antenna does not obstruct touch electrode functionality
Solution Approach 2:
Different regions of the display panel surface are assigned different functional qualities: the touch electrode regions maintain high electrical conductivity for touch sensing, while the antenna regions are optimized for electromagnetic radiation and reception. This local differentiation allows each function to operate at optimal performance without compromising the other
Data Source
AI summary
A touch sensor built-in display device having a near field communication function includes a display panel providing a display function, a touch electrode for the touch sensor formed in a layer disposed on a display surface side of the display panel, and an antenna wire for a near field communication function formed in a same layer as the touch electrode.