Array Substrate Signal Layering for Large In-Cell Touch Screens
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Solution Overview
Problem
Large-sized in-cell touch screens face significant load issues due to the large number of touch sensing blocks and signal lines, which affect performance and increase load, especially in devices larger than 32 inches.
Innovation Solution
The array substrate design includes touch signal lines grouped into multiple layers, with orthographic projections of these lines positioned on either side of second signal lines, allowing for reduced overlap with touch electrodes and improved spacing, thereby reducing load and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of touch sensing blocks and signal lines is increased to support large-sized touch screens, then the touch coverage and functionality are improved, but the load on the array substrate increases significantly
Solution Approach 1:
The patent applies dimensionality change by arranging touch signal lines and second signal lines in different layers (z-dimension) rather than only in the same plane. This vertical stacking allows signal lines to pass through each other's projection areas without electrical interference, effectively utilizing three-dimensional space to reduce the number of signal lines required in each individual layer, thereby reducing the overall load on the array substrate while maintaining large touch screen coverage.
Solution Approach 2:
The patent segments the signal transmission function by separating touch signal lines and display signal lines into different layers. Touch signal lines are arranged in a first layer while second signal lines are arranged in a second layer, allowing independent optimization of each signal type and reducing the cumulative load on the substrate.
2Adaptability or versatility
If touch signal lines are arranged to overlap with second signal lines in the same layer, then routing flexibility is improved, but electrical interference and signal quality deteriorate
Solution Approach 1:
The patent resolves the conflict between routing flexibility and signal quality by moving the arrangement to another dimension (vertical layering). Touch signal lines in the first layer can overlap in projection with second signal lines in the second layer, achieving routing flexibility without electrical interference because the lines are separated in the z-dimension by insulating layers.
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between the first layer (containing touch signal lines) and the second layer (containing second signal lines). These insulating layers act as mediators that allow the signal lines to be in close proximity for routing efficiency while preventing direct electrical contact that would cause interference.
3Measurement precision
If more signal lines are added to increase touch sensing resolution, then measurement precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent reduces manufacturing complexity while maintaining touch sensing resolution by utilizing vertical layering. Instead of adding more signal lines in the same plane (which would increase manufacturing difficulty), the patent arranges signal lines in multiple layers, allowing higher resolution with fewer total lines by efficiently utilizing spatial arrangement.
Data Source
AI summary
An array substrate, a manufacturing method of the array substrate, and a touch display device are provided. Orthographic projections of the touch signal lines adjacent to each other included in a same touch signal line group on the base substrate are respectively provided on two sides of an orthographic projection of a same second signal line on the base substrate, each of the orthographic projections of the touch signal lines adjacent to each other and the orthographic projection of the same second signal line includes a portion provided between orthographic projections of the touch electrodes adjacent to each other on the base substrate, and a layer in which the touch signal lines adjacent to each other are provided is different from a layer in which the same second signal line is provided.