Input Sensing Panel Ground Pattern Layout for EMI Shielding
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Solution Overview
Problem
Display devices face challenges in reducing electromagnetic interference (EMI), which affects the performance and reliability of input sensing panels.
Innovation Solution
The implementation of a display device with an input sensing panel that includes a ground pattern and a dam structure, where the ground pattern overlaps the dam and the encapsulation layer, effectively mitigates EMI by providing a controlled electromagnetic environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic signals are present in the display device, then the device can operate with functional components, but electromagnetic interference occurs affecting the input sensing panel performance
Solution Approach 1:
The patent introduces an intermediary shielding structure consisting of a ground pattern and dam configuration. The ground pattern is positioned between the electromagnetic signal sources and the input sensing panel, acting as a mediator to intercept and redirect electromagnetic interference to ground, thereby protecting the sensing panel from EMI while allowing the device to operate normally
Solution Approach 2:
The patent converts the harmful electromagnetic interference into a beneficial grounding current path. By designing the ground pattern and dam structure, the electromagnetic signals that would normally cause interference are redirected through the ground pattern to ground potential, transforming the harmful EMI into a controlled current flow that enhances shielding effectiveness
2Object-affected harmful factors
If a ground pattern and dam structure are added to shield against EMI, then electromagnetic interference is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the ground pattern with the existing dam structure of the display device. The ground pattern is integrated into the dam configuration, combining two functional elements into a unified structure that provides both mechanical support and electromagnetic shielding, thereby reducing overall device complexity while maintaining EMI protection
Solution Approach 2:
The dam structure is designed to serve multiple functions: it provides mechanical support for the display layers, defines the boundary of the active area, and simultaneously acts as a carrier for the ground pattern to provide EMI shielding. This multi-functionality reduces the need for separate shielding components, simplifying the overall device structure
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 significantly reduces electromagnetic interference, enhancing the accuracy and reliability of the input sensing panel and overall display device performance.
Implementation Method 1
an input sensing panel disposed on the display panel, wherein the input sensing panel comprises an active area, a trace area adjacent to the active area, and a ground area spaced apart from the active area with the trace area interposed therebetween, sensing electrodes disposed in the active area, trace lines disposed in the trace area and connected to the sensing electrodes, and a ground pattern disposed in the trace area and the ground area, wherein the dam overlaps the ground area, and the ground pattern overlaps the dam
Data Source
AI summary
A display device includes a display panel including pixels, an encapsulation layer overlapping the pixels, and a dam; and an input sensing panel disposed on the display panel, wherein the input sensing panel includes an active area, a trace area adjacent to the active area, and a ground area spaced apart from the active area with the trace area interposed therebetween, sensing electrodes disposed in the active area, trace lines disposed in the trace area and connected to the sensing electrodes, and a ground pattern disposed in the trace area and the ground area, wherein the dam overlaps the ground area, and the ground pattern overlaps the dam.