Touch Electrode Layer Structure for Low-Capacitance Display Wiring
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Solution Overview
Problem
Existing display devices face challenges in achieving high-resolution and high-speed driving due to issues with wiring resistance and capacitance, which affect the performance and efficiency of display devices.
Innovation Solution
The display device incorporates a design with a first touch sacrificial layer positioned between the touch insulating layer and the first electrode, forming an acute angle with the touch insulating layer and having an island shape, and a second touch sacrificial layer between the touch buffer layer and the connection electrode, also with an acute angle, to reduce parasitic capacitance and improve wiring efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional wiring structures are used in display devices, then manufacturing is simpler, but wiring resistance increases and driving speed decreases
Solution Approach 1:
The patent introduces a multi-layer wiring structure with touch electrodes, touch insulating layers, and connection electrodes arranged in different vertical layers. This three-dimensional arrangement reduces the horizontal distance current must travel and provides multiple parallel conduction paths, thereby reducing wiring resistance and improving driving speed without complicating the manufacturing process excessively.
Solution Approach 2:
The touch insulating layer serves as an intermediary between the touch electrode and the connection electrode, enabling electrical connection while maintaining physical separation. This intermediary structure allows for optimized wiring paths and reduces parasitic capacitance, improving signal transmission speed and reducing resistance effects.
2Manufacturing precision
If wiring density is increased to achieve high resolution, then resolution improves, but parasitic capacitance increases and driving speed decreases
Solution Approach 1:
The touch electrode is divided into multiple segments arranged in a grid pattern, with each segment independently connected to connection electrodes. This segmentation reduces the capacitance between adjacent electrode portions while maintaining high spatial resolution, as the segmented structure allows for better electrical isolation between neighboring pixels.
Solution Approach 2:
By moving to a multi-layer architecture where touch electrodes and connection electrodes are separated in the vertical dimension, the patent reduces parasitic capacitance between signal lines. The vertical stacking allows high-density horizontal wiring while maintaining electrical isolation through insulating layers, thus achieving high resolution without proportionally increasing parasitic capacitance.
3Adaptability or versatility
If touch electrode structure is added for touch functionality, then touch capability is achieved, but parasitic capacitance increases and affects display performance
Solution Approach 1:
The touch insulating layer acts as an intermediary between the touch electrode and underlying connection electrodes, allowing the touch electrode to sense finger contact while minimizing capacitive coupling to the signal lines below. This intermediary insulation reduces parasitic capacitance that would otherwise degrade touch sensitivity and display performance.
Solution Approach 2:
The touch electrode structure is designed with varying local properties - the electrode material and insulation thickness are optimized in different regions to balance touch sensitivity with parasitic capacitance reduction. Areas requiring higher touch sensitivity have different structural characteristics than areas where minimizing capacitance is prioritized, allowing simultaneous achievement of both goals.
Data Source
AI summary
A display device includes a substrate including an emission area and a non-emission area; a thin film transistor layer positioned on the substrate; a touch buffer layer positioned on the thin film transistor layer; a connection electrode positioned on the touch buffer layer; a touch insulating layer positioned on the connection electrode; a first electrode positioned on the touch insulating layer, and overlapping the non-emission area; and a first touch sacrificial layer positioned between the touch insulating layer and the first electrode, wherein the first touch sacrificial layer does not overlap the emission area, and is positioned in an island shape while overlapping the non-emission area, and an inclination angle formed between the touch insulating layer and a side surface of the first touch sacrificial layer has an acute angle.