Touch Display Array Substrate Via Hole Distribution
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Solution Overview
Problem
In in-cell self-capacitance touch technology, the uneven distribution of via holes on touch electrodes leads to image unevenness and visible mura in touch display devices due to the varying number of via holes between different regions of the touch electrodes.
Innovation Solution
The introduction of auxiliary lines and strategically placed auxiliary via holes between touch electrodes, which are connected through third via holes, helps to evenly distribute the via holes, reducing the difference in their numbers and spacing them apart by multiple pixel units to achieve a more uniform distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a broken touch line is used to connect the touch electrode to the driving circuit, then the load of the array substrate is reduced, but the via holes are unevenly distributed on the touch electrodes causing image unevenness and visible mura
Solution Approach 1:
The touch line is divided into multiple segments with gaps between them, allowing via holes to be distributed across different regions. The segmentation enables the touch line to connect touch electrodes at multiple positions rather than requiring a continuous line, thus distributing via holes more evenly across the touch electrode surface.
Solution Approach 2:
Different regions of the touch electrode are provided with via holes at different positions and densities according to local requirements. The first region and second region have via holes arranged differently to achieve uniform overall distribution while accounting for local variations in electrode geometry and electrical requirements.
2Device complexity
If via holes are concentrated in one region of the touch electrode, then the connection to the driving circuit is simplified, but image unevenness and visible mura occur in the displayed images
Solution Approach 1:
The connection structure is segmented into multiple via hole groups distributed across different regions of the touch electrode. Instead of concentrating all via holes in one location, they are divided into first via holes in a first region and second via holes in a second region, both connected to the same touch electrode through the segmented touch line.
Solution Approach 2:
The via hole distribution is extended from a single concentrated location to multiple spatial dimensions across the touch electrode surface. Via holes are arranged in different regions (first region and second region) rather than being confined to one location, achieving uniform distribution in the planar dimension.
Data Source
AI summary
The present disclosure provides a touch display device, a touch display panel and an array substrate. The array substrate includes a substrate; a plurality of pixel units disposed on the substrate, columns of touch electrodes, a driving circuit for driving the touch electrodes, touch lines connected to a corresponding touch electrode through a first via hole for connecting the corresponding touch electrode to the driving circuit, and at least one auxiliary line positioned between two adjacent touch lines. Each touch electrode covers a plurality of pixel units. Each auxiliary line is connected through a third via hole to a touch electrode at the third via hole and broken between adjacent touch electrodes, wherein for each column of touch electrodes, auxiliary via holes are disposed on the touch electrodes.