Touch Display Substrate Shielding Layout for Signal Crosstalk
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Solution Overview
Problem
The issue of crosstalk between touch and display functions in existing touch display apparatuses, particularly in capacitive touch panels, leads to reduced yield and abnormal display due to close proximity of touch and display signal lines, which is exacerbated in thin and transparent applications.
Innovation Solution
A touch display substrate design with a mesh structure incorporating second signal lines connected to a constant potential terminal, positioned between touch and display signal lines to shield interference, reducing crosstalk and improving signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If touch signal lines and display signal lines are placed in close proximity to achieve a thin and transparent display, then the display transparency and thinness are improved, but signal crosstalk increases causing abnormal display and reduced yield
Solution Approach 1:
The patent introduces a shielding signal line as an intermediary element positioned between the touch signal line and display signal line. This shielding line acts as a mediator that blocks electromagnetic interference between the two signal lines, preventing crosstalk while allowing the lines to remain in close proximity for thin and transparent display design.
Solution Approach 2:
The patent segments the signal transmission paths by introducing a separate shielding signal line that divides the electromagnetic field between touch and display signals. This segmentation isolates the two functional areas, preventing mutual interference while maintaining the overall integrated structure of the display panel.
2Length of stationary object
If touch signal lines and display signal lines are routed close together to reduce device thickness, then the device thinness is improved, but manufacturing yield decreases due to crosstalk-induced abnormalities
Solution Approach 1:
The shielding signal line serves as a protective intermediary that enables close routing of touch and display signal lines without causing crosstalk-related manufacturing defects. This intermediary structure allows the device to achieve thinness while maintaining high manufacturing yield by preventing signal interference that would otherwise cause production failures.
3Illumination intensity
If the distance between touch and display signal lines is reduced to achieve transparent and thin display, then display performance is improved, but signal interference increases causing abnormal display
Solution Approach 1:
The shielding signal line acts as an intermediary barrier that allows the touch and display signal lines to be positioned close together for transparent and thin display while preventing electromagnetic interference. This mediator ensures that signal integrity is maintained despite the reduced distance between functional layers.
Solution Approach 2:
The shielding signal line is configured to maintain a constant potential (such as ground potential) that creates an equipotential barrier between the touch and display signal lines. This equipotential shielding prevents electromagnetic coupling and interference, ensuring reliable display operation at reduced line spacing.
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 isolates touch and display signals, enhancing the performance and reliability of the touch display substrate by minimizing signal interference and maintaining optimal touch and display effects.
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.