Touch Sensor Antenna Module Layout for Signal Interference Reduction

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Solution Overview

Problem

In display devices combining antennas and touch sensors, mutual signal interference and impedance issues lead to suboptimal antenna performance, affecting signaling efficiency and reliability.

Innovation Solution

A touch sensor-antenna module design where antenna patterns are arranged to avoid overlapping with traces and sensing electrodes, using a dummy antenna pattern and a dielectric layer to enhance radiation directivity and prevent signal disturbance, with selective feeding to non-overlapping antenna patterns via an integrated circuit chip.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the antenna and touch sensor are combined in one display device, then integration of communication and touch input functions is achieved, but mutual signal interference and impedance disturbance occur

Engineering Contradiction:

Improveintegration of communication and touch input functionsVSAvoidsignal interference and impedance stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The display device is divided into distinct functional regions: an antenna region for wireless communication and a touch sensor region for input detection. This spatial segmentation prevents signal interference between the antenna and touch sensor while maintaining both functions within the same device, resolving the contradiction between integration and signal reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display device are assigned different functional properties: the antenna region is optimized for electromagnetic wave transmission with appropriate impedance characteristics, while the touch sensor region is optimized for capacitive sensing. This local differentiation allows each component to operate optimally without interfering with the other, achieving both integration and reliability.

Inventive Principle:

Principle #3Local quality

2Reliability

If antenna patterns are arranged to avoid overlapping with traces, then signal interference is reduced, but antenna layout complexity increases

Engineering Contradiction:

Improvesignal interference reductionVSAvoidantenna layout design

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The antenna patterns are extracted and positioned in a dedicated region separate from the touch sensor trace patterns. By taking the antenna design out of the constrained space between traces and providing it with its own optimized layout area, signal interference is minimized while the layout complexity is managed through clear spatial separation rather than complex routing adjustments.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11340722B2Touch sensor-antenna module and display device including the same

Publication Date: 2022.05.24 DONGWOO FINE CHEM CO LTD

AI summary

A touch sensor-antenna module includes a touch sensor electrode layer including a plurality of sensing electrodes and traces electrically connected to the sensing electrodes, and an antenna electrode layer disposed over the touch sensor electrode layer or under the touch sensor electrode layer. The antenna electrode layer includes an antenna pattern that does not overlap the traces in a planar view. An electrical interference from the traces may be reduced to improve an antenna signal property.