NFC Antenna Integration in Display Devices via Shared Insulating Layers
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Solution Overview
Problem
Existing display devices face challenges in integrating near field communication (NFC) antennas without increasing the device's size or complexity, while maintaining the functionality and image quality of the touch sensor and display.
Innovation Solution
A display device design that incorporates a loop antenna surrounding the periphery of the display part, with the touch sensor and antenna sharing a common insulating layer, and using flexible wiring to connect terminal electrodes, allowing for NFC functionality without adding new layers and minimizing the frame region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an NFC antenna is integrated into the display device, then NFC functionality is achieved, but the device size and frame region increase
Solution Approach 1:
The antenna is merged with the touch sensor structure by sharing the same insulating layer and using overlapping electrode patterns. The antenna is formed using the same first insulating layer and connection wiring that are already part of the touch sensor, eliminating the need for separate antenna structures and reducing the overall frame region.
Solution Approach 2:
The first insulating layer and connection wiring serve dual functions: they are structural components of the touch sensor while simultaneously forming part of the NFC antenna structure. This multi-functionality allows NFC capability to be added without requiring additional dedicated layers or components.
2Adaptability or versatility
If additional layers are added for the antenna, then NFC functionality is achieved, but the device thickness and manufacturing complexity increase
Solution Approach 1:
The antenna structure is combined with the existing touch sensor layers. The first insulating layer that is already present for the touch sensor is reused as the substrate for the antenna, and the connection wiring is utilized as part of the antenna conductor, thereby avoiding the addition of new layers.
Solution Approach 2:
Existing layers serve multiple purposes: the first insulating layer provides both touch sensor support and antenna substrate, while the connection wiring provides both electrical connectivity for the touch sensor and conductive path for the antenna, reducing overall device complexity.
3Area of stationary object
If the antenna overlaps with the touch sensor wiring, then space is saved, but signal interference may occur
Solution Approach 1:
The first insulating layer acts as an intermediary between the antenna and the touch sensor wiring. This insulating layer provides electrical isolation that prevents signal interference while allowing the antenna to be positioned in close proximity to and overlap with the touch sensor structures, thereby saving space.
Data Source
AI summary
A display device in an embodiment according to the present invention includes a base member, a display part with a plurality of pixels above the base member, a touch sensor overlapping the display part, an antenna in a periphery part of the display part, and a terminal part including a plurality of terminal electrodes on an outer side of the antenna. The touch sensor includes a first sensor electrode arranged on a first surface side of a first insulating layer and having a plurality of first electrode patterns arranged in a first direction, and a second sensor electrode arranged on the first surface side of the first insulating layer and having a plurality of second electrode patterns arranged in a second direction intersecting the first direction.