Display Panel Shielding Layout for Data-Touch Noise Reduction
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Solution Overview
Problem
Electromagnetic noise generated at data lines in display devices can deteriorate touch performance by interfering with touch lines, leading to reduced touch sensitivity and accuracy.
Innovation Solution
A display device and panel design that includes a shielding layer between data link lines and touch link lines, along with specific insulation layers and a buffer layer to reduce noise and enhance touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data lines and touch lines are disposed close to each other in the same area, then device complexity is reduced, but electromagnetic noise from data lines interferes with touch lines, deteriorating touch performance
Solution Approach 1:
The patent divides the display panel into distinct functional areas: a first area for data lines, a second area for touch lines, and a third area for data link lines and touch link lines. This spatial segmentation separates signal lines that would otherwise interfere with each other, reducing electromagnetic noise while maintaining a compact overall layout.
Solution Approach 2:
The patent introduces a shielding layer as an intermediary element between the data link lines and touch link lines in the third area. This shielding layer acts as a mediator that blocks electromagnetic noise from the data link lines from interfering with the touch link lines, thereby protecting touch performance without significantly increasing layout complexity.
2Reliability
If a shielding layer is added between data link lines and touch link lines, then noise interference is reduced and touch performance is enhanced, but device complexity increases
Solution Approach 1:
The shielding layer is positioned in the third area between data link lines and touch link lines, serving as a targeted intermediary that addresses noise interference only where it occurs. This localized approach provides effective noise blocking while minimizing the overall increase in structural complexity compared to shielding entire areas.
Solution Approach 2:
The patent applies different structural characteristics to different areas of the display panel. The third area includes a shielding layer with specific characteristics (grounded or connected to reference potential) that are locally optimized for noise blocking, while other areas maintain simpler structures. This local quality approach provides effective noise protection without unnecessarily complicating the entire device.
3Measurement precision
If multiple insulation layers and buffer layers are added to reduce noise, then touch signal processing is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the insulation structure into multiple discrete layers (first insulation layer, second insulation layer, third insulation layer, fourth insulation layer) positioned at specific locations between signal lines. Each insulation layer addresses specific noise pathways, and their segmented arrangement allows for standardized manufacturing processes while achieving comprehensive noise protection and enhanced touch signal accuracy.
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 design effectively reduces noise interference, enhancing touch signal processing and enabling low-power driving with improved touch sensitivity and accuracy.
Implementation Method 1
a third area where a plurality of data link lines and a plurality of touch link lines are disposed, between the first area and the second area. The third area may include a fourth area between the plurality of data link lines and the plurality of touch link lines and where a shielding layer is disposed to overlap at least some of the plurality of data link lines
Data Source
AI summary
A display device according to example embodiments of the disclosure may comprise a display area where a plurality of subpixels and a plurality of touch electrodes are disposed, a first area where a plurality of data lines and a plurality of touch lines are disposed, a second area where a plurality of data pads and a plurality of touch pads are disposed, and a third area where a plurality of data link lines and a plurality of touch link lines are disposed, between the first area and the second area. The third area may include a fourth area between the plurality of data link lines and the plurality of touch link lines and where a shielding layer is disposed to overlap at least some of the plurality of data link lines.