Touch Sensor Electrode Antenna Layout for Multi-Band Displays
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Solution Overview
Problem
Display devices face challenges in integrating antenna functions for various frequency bands while maintaining touch sensing capabilities, as existing solutions often require separate components for radio communication and touch sensing, leading to increased complexity and size.
Innovation Solution
A display device design that utilizes sensor electrodes for both touch sensing and radio communication, where sensor electrodes act as antennas, with an antenna driving circuit selecting appropriate electrodes for different frequency bands and a radio signal connection unit coupling signals to the antenna driving circuit, allowing for dual functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate antenna components are used for radio communication, then radio communication reliability is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the antenna function with the touch sensor electrode layer by forming coupling capacitors between the sensor lines and radio signal lines. This integration allows the same physical structure to serve both touch sensing and radio communication purposes, eliminating the need for separate antenna components and reducing device complexity while maintaining communication reliability
Solution Approach 2:
The sensor electrode layer is designed to perform multiple functions: it serves as both the touch sensing element and the antenna structure for radio communication. The coupling capacitor configuration enables the sensor lines to function dual-purpose, simultaneously detecting touch input and transmitting/receiving radio signals, thus achieving multi-functionality without increasing device complexity
2Adaptability or versatility
If separate antenna components are used for different frequency bands, then communication adaptability is improved, but device size and complexity increase
Solution Approach 1:
The patent implements dynamic frequency band selection by configuring multiple coupling capacitors with different capacitance values (e.g., first coupling capacitor with first capacitance, second coupling capacitor with second capacitance). The system can dynamically select which coupling capacitor to use based on the required frequency band, allowing the same sensor electrode structure to adapt to different communication standards (4G, 5G, etc.) without adding physical antenna components for each band
Solution Approach 2:
The invention changes electrical parameters (capacitance values of coupling capacitors) to achieve frequency band adaptation. By adjusting the capacitance parameter of the coupling capacitor, the resonant frequency of the antenna system is tuned to match different communication frequency bands, enabling versatile communication capability without increasing device size
3Device complexity
If sensor electrodes are used for both touch sensing and radio communication, then device complexity is reduced, but signal interference may increase
Solution Approach 1:
The coupling capacitor serves as an intermediary element between the sensor lines and radio signal lines. It provides galvanic isolation while allowing capacitive coupling, which blocks direct current paths that could cause interference while permitting the transmission of radio frequency signals. This intermediary structure enables both touch sensing and radio communication to coexist on the same sensor electrode layer without significant signal interference
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables a compact and efficient integration of touch sensing and radio communication capabilities, reducing the need for separate antenna components and improving performance by optimizing electrode selection based on reception sensitivity.
Implementation Method 1
radio signal lines that form coupling capacitors with the sensor circuit lines
Data Source
AI summary
A display device includes sensor electrodes for sensing a touch. The sensor electrodes may also be used as an antenna. A display circuit board of the display device includes a radio signal connection unit for providing touch sensing signals and radio reception signals of the sensor electrodes to a touch driving circuit and an antenna driving circuit. Therefore, the display device not only senses a user's touch using the sensor electrodes but also conducts mobile communication using the sensor electrodes. For example, sensor electrodes for sensing a touch may also be used as an antenna.