Pixel-Aligned Ground Mesh for Display EMI Reduction
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Solution Overview
Problem
Current display-and-touch-screen apparatuses face challenges in reducing electromagnetic interference without compromising visibility or mechanical robustness, particularly due to limitations in transparent conductive materials and the tendency of existing solutions to increase electrical noise and reflections.
Innovation Solution
A ground mesh with electrically connected ground lines is introduced between pixels in the display apparatus to absorb and conduct electromagnetic radiation, reducing interference while maintaining transparency and mechanical flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transparent conductive materials are used to reduce electromagnetic interference, then electromagnetic interference is reduced, but transparency and mechanical flexibility are compromised
Solution Approach 1:
The ground plane is segmented into individual ground lines that are aligned with pixel boundaries and positioned in the gaps between pixels. This segmentation allows the ground structure to provide electromagnetic shielding while minimizing obstruction of light transmission through the display area.
Solution Approach 2:
Ground lines are placed locally in the gaps between pixels rather than forming a continuous opaque layer. This local placement provides electromagnetic interference reduction specifically where needed while maintaining transparency in the pixel display regions.
2Object-affected harmful factors
If ground lines are placed between pixels to reduce electromagnetic interference, then electromagnetic radiation is reduced, but manufacturing alignment precision is required
Solution Approach 1:
The pixel gap pattern is established during the display manufacturing process before the ground mesh is applied. This preliminary establishment of the gap pattern serves as a guide for subsequent ground line placement, reducing the alignment precision requirements for the ground mesh application.
Solution Approach 2:
The pixel structure itself, with its inherent gaps between pixels, serves as the alignment reference for the ground lines. The ground lines automatically align with the pixel gaps through the predetermined pattern, eliminating the need for separate high-precision alignment processes.
3Object-affected harmful factors
If existing ground structures are used, then electromagnetic interference is addressed, but electrical noise and reflections increase
Solution Approach 1:
The pixel gaps, which are necessarily present in display structures and represent potential sources of electromagnetic interference, are converted into beneficial positions for placing ground lines. The ground lines in these gaps effectively shield the pixel regions without requiring additional space or creating extra reflections.
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 implementation of a ground mesh effectively minimizes electromagnetic interference, enhances display performance, and maintains visibility, even under mechanical stress, by absorbing electromagnetic radiation and reducing spurious signals in both touch screens and displays.
Implementation Method 1
A ground mesh with electrically connected ground lines is introduced between pixels in the display apparatus to absorb and conduct electromagnetic radiation, reducing interference
Data Source
AI summary
Display apparatus with reduced susceptibility to electro-magnetic interference includes a display including an array of pixels and a ground mesh located in proximity to the display. The ground mesh includes a plurality of electrically connected ground lines located between the pixels, so that electro-magnetic radiation emitted or received by the display is reduced.