Grid-Shaped Touch Electrode With Hollow Regions For Wearables
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Solution Overview
Problem
In small-sized wearable products, touch electrodes with a block-shaped indium tin oxide (ITO) structure have large capacitance, leading to a low signal-to-noise ratio (SNR) for touch responses, requiring high-quality touch and display driver integration (TDDI) ICs and increasing production costs, while also being prone to interference from external signals, which reduces working reliability.
Innovation Solution
A touch display panel design featuring a grid-shaped touch electrode layer with hollow regions and physical regions, made of materials like molybdenum or aluminum, where the hollow regions correspond to sub-pixels or pixel units on the display substrate, reducing self-capacitance and improving SNR, and incorporating photo spacers and shins to enhance touch response continuity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If block-shaped ITO touch electrode structure is used, then touch electrode continuity is maintained, but self-capacitance increases leading to low signal-to-noise ratio
Solution Approach 1:
The touch electrode layer is divided into multiple isolated island regions corresponding to pixel units, with hollow regions between them. This segmentation reduces the total continuous electrode area, thereby reducing self-capacitance and improving signal-to-noise ratio while maintaining touch functionality through the distributed island structure.
Solution Approach 2:
The touch electrode layer incorporates hollow regions that create a porous or grid-like structure. This reduces the material volume and continuous conductive path area, effectively lowering self-capacitance while the remaining conductive regions maintain sufficient touch response through the reduced capacitance design.
2Reliability
If hollow regions are introduced in touch electrode layer, then self-capacitance is reduced, but touch electrode continuity is compromised
Solution Approach 1:
The electrode is segmented into discrete islands rather than continuous blocks. Each island corresponds to a pixel unit and is electrically isolated, but collectively they provide distributed touch sensing capability, maintaining functional continuity through spatial distribution rather than physical connection.
Solution Approach 2:
The touch electrode structure transitions from a two-dimensional continuous plane to a three-dimensional distributed pattern with hollow regions. This dimensional change allows the electrode to maintain functional coverage across the display surface while reducing material continuity and self-capacitance through the introduced void spaces.
3Reliability
If touch electrode area is increased to improve touch sensitivity, then external signal interference increases, but reducing area improves reliability
Solution Approach 1:
The large continuous touch electrode is segmented into multiple smaller island regions. This segmentation reduces the total effective area susceptible to external electromagnetic interference while maintaining distributed touch sensing capability across the display surface, thereby improving working reliability.
Solution Approach 2:
The introduction of hollow regions creates a porous electrode structure that reduces the effective conductive area exposed to external signals. This porous design lowers the electrode's susceptibility to external signal interference while maintaining sufficient touch response through the distributed island configuration.
Data Source
AI summary
Provided are a touch display panel and a method for preparing the touch display panel. The touch display panel includes a base substrate, a display substrate disposed on the base substrate, and a touch substrate disposed on the display substrate, wherein the display substrate comprises a plurality of pixel units arranged in a matrix, the pixel units each comprise a plurality of sub-pixels, the touch substrate comprises a touch electrode layer, the touch electrode layer comprises a plurality of hollow regions, and an orthographic projection of a hollow region on the base substrate contains an orthographic projection of at least one sub-pixel or at least one pixel unit on the base substrate.