Display Substrate Wiring Overlap for Touch and Source-Drain Isolation
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Solution Overview
Problem
Existing display technologies face challenges in efficiently integrating touch metal layers and source-drain metal layers in flexible display substrates, particularly in creating a robust and efficient double-layer wiring structure that minimizes overlap and interference while ensuring electrical connectivity.
Innovation Solution
A display substrate design featuring a double-layer wiring structure where the first and second wirings form an overlapping area, with electrical connections through grooves or via holes in the insulating layer, and the inclusion of isolation dams to manage spacing and overlap, allowing for efficient integration of touch and source-drain metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-layer wiring structure is created with overlapping touch metal layer and source-drain metal layer, then electrical connectivity and power supply efficiency are improved, but interference between the two metal layers increases
Solution Approach 1:
An insulating layer is introduced between the touch metal layer and source-drain metal layer to act as an intermediary element. This insulating layer physically separates the two conductive layers while allowing their projections to overlap, thereby maintaining electrical connectivity through controlled pathways while preventing direct interference and short circuits between the metal layers.
Solution Approach 2:
The patent utilizes vertical layering (z-dimension) to resolve the contradiction. By stacking the touch metal layer and source-drain metal layer in different vertical planes separated by an insulating layer, the design allows horizontal overlap for electrical connectivity while the vertical separation prevents interference. This dimensional approach transforms a two-dimensional layout problem into a three-dimensional spatial solution.
2Adaptability or versatility
If the touch metal layer and source-drain metal layer are integrated in a flexible display substrate, then device functionality is enhanced, but manufacturing complexity increases
Solution Approach 1:
The wiring structure is segmented into distinct functional layers: the source-drain metal layer for power supply, the insulating layer for isolation, and the touch metal layer for touch sensing. This segmentation allows each layer to be optimized and manufactured independently using specialized processes, then combined through lamination or sequential deposition, thereby managing complexity while achieving enhanced device functionality.
Solution Approach 2:
The insulating layer serves multiple functions simultaneously: it provides electrical isolation between conductive layers, acts as a structural support for the flexible substrate, and enables the overlapping configuration of metal layers. This multi-functionality reduces the need for additional separate components, thereby managing manufacturing complexity while achieving versatile device functionality.
Data Source
AI summary
A display substrate and a preparation method thereof, and a display apparatus, wherein on a plane perpendicular to the display substrate, the display substrate includes a source-drain metal layer located on a base substrate, an insulating layer located on the source-drain metal layer, and a touch metal layer located on the insulating layer, the source-drain metal layer includes a first wiring, the touch metal layer includes a second wiring, there is an overlapping area between an orthographic projection of the first wiring on the base substrate and an orthographic projection of the second wiring on the base substrate; and the first wiring and the second wiring form a double-layer wiring structure.