Input Sensing Layout With EMI Attenuating Lines for Displays
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Solution Overview
Problem
Display devices produce unwanted electromagnetic interference (EMI) due to driving signals applied to sensing electrodes, which can disturb the operation of other devices.
Innovation Solution
Incorporation of a guard line, ground line, and electromagnetic attenuating line in the non-active region of the display panel, spaced apart from sensing lines, to mitigate EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving signal is applied to the sensing electrodes, then the sensing function is enabled, but electromagnetic interference is generated
Solution Approach 1:
The patent introduces an electromagnetic attenuating line as an intermediary element between the sensing lines and external environment. This attenuating line acts as a mediator that reduces the strength of electromagnetic waves generated by the driving signal, thereby preventing EMI while maintaining the sensing function. The guard lines and ground lines serve as additional intermediary structures to shield and redirect electromagnetic interference away from sensitive components.
Solution Approach 2:
The patent converts the harmful electromagnetic waves generated by the driving signal into beneficial shielding effects. By strategically placing ground lines and guard lines around the sensing electrodes, the electromagnetic energy that would otherwise cause interference is redirected and dissipated through these protective structures, transforming the harmful EMI into a shielding mechanism that protects the sensing system.
2Object-generated harmful factors
If guard line, ground line, and electromagnetic attenuating line are added, then EMI is reduced, but device complexity increases
Solution Approach 1:
The patent merges multiple protective functions into a single integrated structure. The guard lines, ground lines, and electromagnetic attenuating lines are combined into a unified shielding system that works together to reduce EMI. This merging approach allows the multiple protective elements to be implemented as a coordinated structure rather than separate independent components, thereby reducing overall device complexity while maintaining comprehensive EMI protection.
Solution Approach 2:
The ground lines and guard lines serve multiple functions simultaneously: they provide electromagnetic shielding, act as reference planes for signal integrity, and offer pathways for interference current dissipation. This multi-functionality reduces the need for separate dedicated EMI protection components, thereby simplifying the overall device structure while achieving comprehensive EMI reduction across multiple mechanisms.
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
Reduces electromagnetic interference, enhancing the operational stability and performance of display devices by minimizing noise interference.
Implementation Method 1
an electromagnetic attenuating line which is disposed between the guard line and the ground line... the unwanted electromagnetic wave resulting from the driving signal may be produced... The electromagnetic wave may produce noise in another device and may disturb its operation
Data Source
AI summary
A display device includes a display panel, and an input sensing part disposed on the display panel and in which an active region and a non-active region around the active region are defined. The input sensing part includes a plurality of sensing electrodes dispose in the active region, a plurality of sensing lines electrically connected to the sensing electrodes and disposed in the non-active region, and a guard line, a ground line, and an electromagnetic attenuating line spaced apart from the sensing lines and disposed in the non-active region. The guard line, the ground line, and the electromagnetic attenuating line are disposed at an outside of the sensing lines.