Array Substrate Touch Wire Configuration for Display Defect Reduction
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Solution Overview
Problem
Existing display technologies face issues with high driving resistance and low picture quality due to recesses formed during the manufacturing process of array substrates, leading to display defects like diagonal fringes, black dots, and horizontal/vertical Mura.
Innovation Solution
The array substrate design includes a touch wire disposed on one side of the touch electrode away from the base substrate, with a planarization layer and passivation layers to reduce recess size and improve surface smoothness, and a connecting electrode formed in the same layer as the touch wire to enhance contact area and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the touch wire is disposed at one side of the touch electrode away from the base substrate with planarization and passivation layers, then the surface smoothness is improved and recess size is reduced, but the device complexity increases
Solution Approach 1:
The touch wire is repositioned from a planar configuration to a three-dimensional configuration where it is disposed at one side of the touch electrode away from the base substrate. This spatial rearrangement allows the wire to bypass the recess formation issue while maintaining electrical connectivity, effectively solving the surface smoothness problem through dimensional change.
Solution Approach 2:
Passivation layers and planarization layers are introduced as intermediary structures between the touch wire and the base substrate. These intermediary layers fill and smooth the recesses, providing a planar surface that improves overall surface smoothness while isolating the underlying irregularities.
2Reliability
If the connecting electrode is formed in the same layer as the touch wire to enhance contact area, then the driving resistance is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The connecting electrode is formed in the same layer as the touch wire, merging two previously separate fabrication steps into one. This integration increases the contact area between the touch wire and the underlying electrode structures, thereby reducing driving resistance. The simultaneous formation also simplifies the manufacturing process by reducing the number of alignment steps required.
Solution Approach 2:
The connecting electrode is formed in advance within the same layer as the touch wire, establishing electrical connectivity before subsequent manufacturing steps. This preliminary action ensures that the contact area is maximized early in the process, reducing driving resistance without requiring additional precision-critical alignment steps later.
3Reliability
If the first portion of the touch wire has a size greater than or equal to a quarter of the touch electrode size, then the contact area is increased and resistance is reduced, but the area occupied by the touch wire increases
Solution Approach 1:
The touch wire is designed with non-uniform dimensions: the first portion that contacts the touch electrode has a size greater than or equal to a quarter of the touch electrode size to ensure adequate contact area and low resistance, while the second portion extends with smaller cross-section to minimize the overall area occupied. This local variation in quality optimizes both electrical performance and space utilization.
Data Source
AI summary
Disclosed are an array substrate, a manufacturing method thereof, and a display device. The array substrate includes: a base substrate; an electrode layer, located on the base substrate and including a first electrode and a second electrode which are spaced apart from each other; a touch electrode, located on the base substrate, and a touch wire, connected to the touch electrode; the touch electrode and the first electrode are insulated from each other, the touch electrode and the second electrode are insulated from each other, the touch wire is at one side of the touch electrode away from the base substrate, and the electrode layer is at one side of the touch electrode close to the base substrate.