In-Cell Touch Array Substrate Layout for Lower Touch Loading
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Solution Overview
Problem
Existing In-Cell touch screen technologies face challenges with high touch loading and complex manufacturing processes, which affect touch performance and increase production time.
Innovation Solution
The proposed solution involves an array substrate design with a specific layer structure and manufacturing method, where a single insulation layer is used between the first and second transparent conductive layers, and the touch signal line is directly contacted with the pixel electrode, reducing the overlap area and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insulation layers are used to separate touch electrode and pixel electrode, then electrical insulation is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent combines the insulation function with the transparent conductive layer structure. Specifically, the second transparent conductive layer serves dual purposes: it provides electrical connection to the pixel electrode while also providing insulation from the touch electrode below. This merging of functions reduces the number of separate insulation layers needed while maintaining proper electrical isolation.
Solution Approach 2:
The transparent conductive layers are designed to perform multiple functions simultaneously. The second transparent conductive layer acts as both a conductive element (connecting to pixel electrode) and an insulating element (isolating from touch electrode). This multi-functionality reduces overall device complexity while maintaining reliability.
2Length of moving object
If touch signal line is positioned close to touch electrode for compact design, then device thickness is reduced, but capacitive coupling increases touch loading
Solution Approach 1:
The patent utilizes the vertical dimension (layer stacking) to resolve the horizontal proximity issue. By positioning the touch signal line in a different vertical layer (on top of the second transparent conductive layer) rather than horizontally adjacent to the touch electrode, the design maintains compact thickness while reducing capacitive coupling through increased vertical separation distance.
Solution Approach 2:
The second transparent conductive layer acts as an intermediary element between the touch signal line and the touch electrode. This intermediate layer provides both electrical connection to the pixel electrode and physical separation that reduces unwanted capacitive coupling, allowing compact design without excessive touch loading.
3Reliability
If conventional multi-layer insulation structure is used, then electrical isolation is ensured, but manufacturing time and process complexity increase
Solution Approach 1:
The patent merges the insulation function into the existing transparent conductive layer deposition process. Instead of adding separate insulation layers that require additional deposition and patterning steps, the design utilizes the second transparent conductive layer to provide both conduction and insulation functions, thereby reducing manufacturing time while ensuring electrical isolation.
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 the touch loading and improves touch performance by minimizing the capacitance between the touch signal line and the touch electrode, while also reducing the number of processes required for insulation layer deposition, thereby shortening production time.
Implementation Method 1
an insulation layer arranged between the first transparent conductive layer and the second transparent conductive layer
Implementation Method 2
each touch electrode is coupled to at least one touch signal line through a via hole in the insulation layer
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.