Self-Capacitive Touch Substrate with Crossing Signal Lines
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Solution Overview
Problem
Conventional self-capacitive touch substrates experience display brightness non-uniformity due to parasitic capacitance differences between pixel electrodes and data lines, affecting touch control functions and display quality.
Innovation Solution
A self-capacitive touch substrate design featuring touch signal lines that cross over data lines, maintaining equal parasitic capacitances between pixel electrodes and adjacent data lines, with touch signal lines and gate lines in the same layer and material, and a time-division driving mode for touch and display operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch signal lines are disposed parallel to data lines in conventional self-capacitive touch substrates, then the manufacturing process is simplified, but parasitic capacitance differences between pixel electrodes and data lines cause display brightness non-uniformity
Solution Approach 1:
The patent changes the spatial arrangement of touch signal lines from being parallel to data lines (2D plane constraint) to crossing over data lines at specific angles (introducing a new dimensional relationship). This allows touch signal lines to pass through regions that would otherwise create asymmetric parasitic capacitance, thereby achieving uniform display brightness while maintaining manufacturing simplicity through a straightforward crossing configuration.
2Manufacturing precision
If touch signal lines cross over data lines, then display brightness uniformity is improved by maintaining equal parasitic capacitances, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making touch signal lines cross over data lines specifically at regions where pixel electrodes are located, rather than uniformly across the entire display. This localized crossing approach maintains equal parasitic capacitances only where needed (at pixel electrode locations) while keeping the overall signal line configuration relatively simple and manageable.
3Ease of operation
If electrostatic charges are transmitted to touch electrodes, then touch control functions can be performed, but the touch control functions may be affected by charge accumulation
Solution Approach 1:
The patent introduces touch signal lines that cross over data lines as an intermediary structure that helps manage electrostatic charge distribution. This crossing configuration provides additional charge dissipation pathways and reduces charge accumulation on touch electrodes, thereby improving touch control accuracy and reliability while maintaining full touch functionality.
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 design ensures uniform display brightness and enhanced touch control accuracy by maintaining consistent parasitic capacitances, improving display quality and simplifying manufacturing processes.
Implementation Method 1
parasitic capacitances between a pixel electrode in each of the plurality of subpixels and each of the two data lines of the plurality of data lines adjacent to the pixel electrode are substantially the same
Data Source
AI summary
The present application discloses a self-capacitive touch substrate. The self-capacitive touch substrate includes a base substrate; a plurality gate lines crossing over a plurality of data lines; a plurality of touch electrodes; and a plurality of touch signal lines, each of which is electrically connected to one of the plurality of touch electrodes. The plurality of touch signal lines cross over the plurality of data lines.