Touch Display Substrate Shielding Layout for Crosstalk Isolation
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Solution Overview
Problem
Crosstalk between touch and display functions in existing touch display apparatuses leads to reduced yield and abnormal displays, particularly in thin and transparent applications.
Innovation Solution
Incorporation of second signal lines with a constant potential between touch and display signal lines, forming a mesh structure to isolate touch and display signals, reducing crosstalk and improving signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch signal lines and display signal lines are placed in adjacent layers without shielding, then the device structure remains simple, but crosstalk occurs between touch and display signals causing reduced yield and abnormal displays
Solution Approach 1:
The patent introduces second signal lines as an intermediary shielding layer between touch signal lines and display signal lines. These second signal lines are electrically connected to a constant potential terminal and form a mesh structure that acts as an electromagnetic shield, blocking crosstalk between touch and display signals while maintaining overall structural simplicity
Solution Approach 2:
The patent segments the signal transmission paths by introducing a separate shielding layer (second signal lines) that is electrically isolated from both touch and display signal lines. This segmentation allows independent optimization of each signal path and reduces mutual interference through spatial and electrical separation
2Illumination intensity
If the touch display substrate is made thin and transparent, then the display quality and user experience improve, but crosstalk between touch and display functions increases
Solution Approach 1:
The second signal lines serve as an intermediary shielding mesh that can be integrated into the thin substrate structure. This mesh provides electromagnetic shielding against crosstalk while being sufficiently transparent to allow light transmission, thus resolving the contradiction between thinness/transparency and crosstalk reduction
3Productivity
If second signal lines are added to shield between touch and display layers, then crosstalk is reduced and yield improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the second signal lines with existing constant potential terminals (such as VSS or VDD terminals) that are already part of the display pixel circuitry. This merging approach allows the shielding function to be added without requiring entirely new manufacturing processes, as the second signal lines can share routing and terminal connections with existing structures
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
Enhances touch performance by shielding interference between touch and display signals, improving yield and reducing display abnormalities in touch display substrates.
Implementation Method 1
second signal lines on the base substrate; the second signal lines are electrically connected to a constant potential terminal, and the second signal lines are between a layer where the plurality of touch signal lines are located and a layer where the display signal lines are located
Data Source
AI summary
A touch display substrate, a method for manufacturing a touch display substrate and a display apparatus are provided. The touch display substrate includes a base substrate; at least one touch electrode, which includes a plurality of touch signal lines extending in preset directions, and the plurality of touch signal lines form a mesh structure; display signal lines on the base substrate and electrically connected to display pixels for providing display signals thereto; second signal lines electrically connected to a constant potential terminal, and between a layer of the touch signal lines and a layer of the display signal lines. Orthographic projections of the second signal lines on the base substrate at least partially overlap with those of at least some touch signal lines; and/or orthographic projections of the second signal lines on the base substrate at least partially overlap with those of at least some display signal lines.