Mutual Capacitive Touch Substrate Undulating Electrodes
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Solution Overview
Problem
Conventional mutual capacitive touch substrates suffer from optical interference due to regular-shaped touch electrodes, resulting in lower contrast levels during image display and limited touch resolution.
Innovation Solution
A mutual capacitive touch substrate with a matrix of electrode units featuring undulating boundaries and a complementary fill pattern, which reduces optical interference and enhances touch resolution by using a mosaic pattern and protrusions to increase effective touch-control areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If regular-shaped touch electrodes are used, then manufacturing is simple, but optical interference occurs resulting in lower contrast levels
Solution Approach 1:
The patent applies asymmetry by replacing regular-shaped electrodes with irregular undulating boundaries. The first electrode has a first undulating boundary and the second electrode has a second undulating boundary that are substantially complementary to each other, creating an asymmetric pattern that reduces optical interference while maintaining manufacturability through standardized fabrication processes.
Solution Approach 2:
The patent employs curvature principles by using undulating boundaries instead of straight lines or regular shapes. The first undulating boundary of the first electrode and the second undulating boundary of the second electrode create curved, wave-like patterns that disrupt optical interference patterns, thereby improving contrast levels during image display.
2Measurement precision
If distance between adjacent conductive channels is reduced, then touch resolution increases, but optical interference worsens
Solution Approach 1:
The asymmetric undulating boundaries of adjacent electrodes create irregular spacing patterns that disrupt optical interference even when channels are closely spaced. The complementary undulating boundaries ensure that the irregular patterns of adjacent electrodes do not align, preventing moiré effects and maintaining high touch resolution.
Solution Approach 2:
The curved undulating boundaries increase the effective distance between electrode edges through the undulation amplitude, reducing optical interference while maintaining the center-to-center spacing required for high touch resolution. This allows closely spaced conductive channels to coexist with reduced optical interference.
3Object-affected harmful factors
If undulating boundaries with fill pattern are used, then optical interference is suppressed, but device complexity increases
Solution Approach 1:
The patent merges the electrode structure with the fill pattern into a single integrated design. The fill pattern is positioned between the first electrode and second electrode, with its undulating boundary being substantially complementary to both electrode boundaries, creating a unified structure that suppresses optical interference without requiring separate components.
Solution Approach 2:
The undulating boundary design serves multiple functions simultaneously: it defines the electrode shape, creates optical interference suppression through the complementary fill pattern, and maintains electrical isolation between adjacent electrodes. This multi-functionality reduces the need for additional structures to address optical interference.
Data Source
AI summary
The present application discloses a mutual capacitive touch substrate comprising a matrix of a plurality of electrode units, adjacent electrode units complementarily matching each other. Each electrode unit comprises a first electrode having a first undulating boundary; a second electrode having a second undulating boundary; and a fill pattern between the first electrode and the second electrode, having an undulating boundary substantially complementary to corresponding portions of the first undulating boundary and the second undulating boundary. The first electrode, the second electrode, and the fill pattern in a same electrode unit are electrically isolated from each other.