Double-Layer Touch Electrode Switching for Low-EMI Detection
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Solution Overview
Problem
Existing display devices face challenges in reducing electromagnetic interference (EMI) radiation and improving touch detection performance, particularly in applications where strict EMI radiation limits are required, such as in vehicles and portable electronic devices.
Innovation Solution
A touch detection module utilizing first and second touch electrodes arranged in a double layer configuration with a touch insulating layer in between, along with integrated driving and detection switching circuits, and a proximity detection sensing unit to manage EMI radiation and enhance touch detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a touch detection module uses a double layer electrode configuration with selective connection to low potential voltage source, then EMI radiation is reduced, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the electrode connections changeable rather than fixed. The switching circuits dynamically connect or disconnect the first and second touch electrodes from the low potential voltage source based on operational requirements. This dynamic reconfiguration allows the system to reduce EMI radiation during non-touch periods while maintaining touch detection functionality during active periods, resolving the contradiction between EMI reduction and functional simplicity.
Solution Approach 2:
The patent implements periodic action through alternating operational modes: a non-touch detection period where electrodes are connected to low potential voltage source to minimize EMI radiation, and a touch detection period where electrodes are connected to each other for actual touch sensing. This periodic switching between different connection states allows the system to achieve EMI reduction while maintaining touch detection capability, effectively resolving the technical contradiction.
2Measurement precision
If switching circuits are used to selectively connect electrodes to low potential voltage source, then touch detection performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the driving and detection functions into a unified touch detection module structure. The first and second touch electrodes are integrated with switching circuits that serve dual purposes: connecting electrodes to low potential voltage source for EMI reduction and connecting electrodes to each other for touch detection. This merging of functions reduces the need for separate dedicated circuits, thereby improving touch detection performance while mitigating manufacturing complexity.
Solution Approach 2:
The switching circuits in the patent serve multiple functions: they act as connection switches for EMI reduction, as signal routing elements for touch detection, and as part of the overall touch sensing mechanism. This multi-functionality allows the same circuit elements to enhance touch detection performance without proportionally increasing manufacturing complexity, as the circuits perform several roles simultaneously rather than requiring dedicated separate components for each function.
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
The solution effectively reduces EMI radiation and enhances touch detection accuracy by selectively connecting electrodes to a low potential voltage source during non-touch and touch detection periods, improving overall performance in EMI-sensitive environments.
Implementation Method 1
a touch insulating layer interposed therebetween
Implementation Method 2
driving switching circuits electrically connecting the second driving electrodes to the respective first driving electrodes corresponding to each other or a low potential voltage source
Implementation Method 3
a touch driving circuit supplying touch driving signals to the first driving electrodes and detecting touch detection signals through the first detection electrodes to detect touch position coordinates
Data Source
AI summary
A touch detection module includes: first driving electrodes side by side; first detection electrodes intersecting the first driving electrodes; second driving electrodes on front surfaces of the first driving electrodes corresponding to the first driving electrodes with a touch insulating layer interposed therebetween; second detection electrodes on front surfaces of the first detection electrodes corresponding to the first detection electrodes with the touch insulating layer interposed therebetween; driving switching circuits electrically connecting the second driving electrodes to the respective first driving electrodes corresponding to each other or a low potential voltage source; detecting switching circuits electrically connecting the second detection electrodes to the respective first detection electrodes corresponding to each other or the low potential voltage source; and a touch driving circuit configured to supply touch driving signals to the first driving electrodes and to detect touch detection signals through the first detection electrodes to detect touch position coordinates.