Input Sensing Electrode Layout for Display EMI Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices suffer from electromagnetic interference (EMI) due to the radiation of unnecessary electromagnetic signals from sensing electrodes, which can disrupt the operation of other devices.
Innovation Solution
The input sensing part includes a first and second sensing electrode insulated from each other, with dummy electrodes and a dummy connection pattern between them, and applies an offset signal with an opposite phase to the driving signal to reduce EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving signals are applied to sensing electrodes through sensing lines, then the sensing electrodes can sense external inputs, but electromagnetic waves are radiated causing electromagnetic interference with other devices
Solution Approach 1:
Dummy electrodes are introduced as intermediary elements between the sensing electrodes and the surrounding environment. These dummy electrodes serve as a mediator to control and redirect electromagnetic field distribution, reducing unwanted radiation from the sensing electrodes while maintaining their sensing capability
Solution Approach 2:
The electrical parameters of the sensing system are modified by introducing dummy electrodes with specific capacitance values. By adjusting the capacitance ratio between dummy electrodes and sensing electrodes, the electromagnetic radiation characteristics are changed to minimize interference while preserving sensing function
2Object-generated harmful factors
If dummy electrodes are added to reduce electromagnetic interference, then electromagnetic interference is minimized, but the device structure becomes more complex
Solution Approach 1:
The dummy electrodes are merged with the existing sensing electrode structure and integrated into the same layer or adjacent layers. The dummy connection pattern is combined with the sensing line structure, reducing the need for separate components and simplifying the overall device architecture despite adding functional elements
Solution Approach 2:
The dummy electrodes serve multiple functions: they control electromagnetic field distribution to reduce interference, maintain electrical potential in dummy areas, and can be integrated with existing connection structures. This multi-functionality reduces the need for additional dedicated components
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
This configuration effectively minimizes electromagnetic interference, enhancing the operational stability and reducing noise in the display device.
Implementation Method 1
When a driving signal with a given frequency is applied to a sensing electrode, an electromagnetic wave associated with the driving signal radiates as an unnecessary electromagnetic signal
Implementation Method 2
A driving signal is applied to the first sensing electrode, and an offset signal is applied to the dummy electrodes. A phase of the offset signal is opposite to a phase of the driving signal
Data Source
AI summary
An input sensing part includes a first sensing electrode, a second sensing electrode that is insulated from the first sensing electrode and crosses the first sensing electrode, a plurality of dummy electrodes that are disposed in dummy areas located between the first and second sensing electrodes, when viewed in a plan view, and a dummy connection pattern that is insulated from the first and second sensing electrodes. The dummy connection pattern crosses the first sensing electrode or the second sensing electrode, when viewed in a plan view, and connects the dummy electrodes.