Array Substrate Touch-Line Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
Existing In-Cell touch display panels face high touch loading and complex manufacturing processes due to the need for multiple insulation layers and overlapping capacitances between touch signal lines and electrodes, leading to increased tact time and reduced touch performance.
Innovation Solution
An array substrate design with a single insulation layer between transparent conductive layers, where touch signal lines are positioned away from touch electrodes, reducing capacitance and overlapping areas, and simplifying the manufacturing process by eliminating one insulation layer formation step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insulation layers are used between touch electrodes and pixel electrodes, then electrical insulation is improved, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent merges the insulation function into the transparent conductive layer structure itself. The transparent conductive layer is designed to provide both electrical conductivity for touch signal transmission and electrical insulation between touch electrodes and pixel electrodes, eliminating the need for separate insulation layers while maintaining reliable electrical isolation.
Solution Approach 2:
The transparent conductive layer performs multiple functions simultaneously: it conducts touch signals, provides electrical insulation between different electrode types, and serves as a structural component of the touch display panel. This multi-functionality reduces the overall number of layers needed in the device.
2Manufacturing precision
If touch signal lines are positioned closer to touch electrodes, then manufacturing precision is improved, but harmful capacitance increases leading to degraded touch performance
Solution Approach 1:
The patent introduces an intermediate transparent conductive layer structure that mediates between the touch signal lines and touch electrodes. This intermediate structure allows for controlled coupling that reduces parasitic capacitance while maintaining manufacturing feasibility, acting as a buffer that optimizes both alignment precision and electrical performance.
3Reliability
If multiple insulation layers are formed during manufacturing, then electrical insulation is ensured, but production time increases
Solution Approach 1:
The patent combines the insulation function with the transparent conductive layer formation process. By designing the transparent conductive layer to inherently provide electrical insulation between touch electrodes and pixel electrodes, the manufacturing process eliminates the need for separate insulation layer deposition steps, thereby reducing production time while maintaining reliable electrical isolation.
4Manufacturing precision
If overlapping areas between touch signal lines and electrodes are increased, then manufacturing precision is improved, but touch loading increases reducing touch performance
Solution Approach 1:
The patent uses the transparent conductive layer as an intermediary that optimizes the coupling between touch signal lines and electrodes. The layer's properties are designed to provide sufficient overlap for manufacturing tolerance while controlling the capacitance to minimize touch loading, achieving a balance between alignment precision and touch performance.
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 reduces touch loading, improves touch performance, and decreases tact time by minimizing capacitance and process complexity, while maintaining thin and lightweight characteristics.
Implementation Method 1
an insulation layer arranged between the first transparent conductive layer and the second transparent conductive layer
Implementation Method 2
a plurality of touch electrodes, each touch electrode including a plurality of touch sub-electrodes
Data Source
AI summary
An array substrate, a manufacturing method and a display device. The array substrate includes: a base substrate; a plurality of gate lines and a plurality of data lines; a plurality of touch signal lines; a plurality of touch electrodes; a plurality of pixel electrodes; and an insulation layer. The touch signal line and a transparent conductive layer where the pixel electrode is located are arranged at a side of the insulation layer away from a transparent conductive layer where the touch electrode is located, an orthogonal projection of the pixel electrode onto the base substrate is separated from an orthogonal projection of the touch signal line onto the base substrate to be insulated from each other, and each touch electrode is coupled to at least one touch signal line through a via hole in the insulation layer.