Sensor Layer Electrode Layout for Narrow-Bezel Touch Detection
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Solution Overview
Problem
Existing electronic devices face challenges in integrating reliable sensor layers with display layers, particularly in reducing the bezel width and optimizing the layout of sensing electrodes to enhance input detection efficiency.
Innovation Solution
A sensor layer design with first and second sensing electrodes arranged in different directions, connected by sensing signal lines, and split electrodes to minimize bezel width and optimize sensing efficiency, while maintaining a continuous process integration with the display layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensing electrodes are arranged to cover the entire display area, then sensing coverage is improved, but bezel width increases
Solution Approach 1:
The sensing electrodes are divided into first sensing electrodes extending in a first direction and second sensing electrodes extending in a second direction crossing the first direction. This segmentation allows the sensing region to be efficiently covered with reduced electrode length, thereby reducing bezel width while maintaining sensing coverage.
Solution Approach 2:
The patent introduces a two-dimensional electrode arrangement where electrodes extend in both first and second directions that cross each other. This dimensional approach allows comprehensive sensing coverage through the intersection of electrode patterns, reducing the need for extended single-direction electrodes and thus minimizing bezel width.
2Productivity
If sensing electrodes are made longer to improve detection efficiency, then input detection efficiency is improved, but device area increases
Solution Approach 1:
The sensing electrodes are segmented into two sets extending in different directions. This segmentation allows each electrode to be shorter while maintaining detection efficiency through the orthogonal arrangement, as the crossing electrodes create multiple sensing zones without requiring individual electrodes to span the entire device area.
3Reliability
If sensing signal lines are routed through contact parts overlapping the sensing region, then connection reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The sensing signal lines are merged with the sensing electrode structure by routing them through contact parts that overlap the sensing region. This integration allows the signal lines to be formed in the same manufacturing process as the electrodes, reducing the number of separate fabrication steps while ensuring reliable electrical connections.
Data Source
AI summary
An electronic apparatus includes: a display layer configured to display images; and a sensor layer on the display layer and comprising a sensing region and a non-sensing region; wherein the sensor layer includes: first sensing electrodes extending on the sensing region in a first direction and arranged in a second direction crossing the first direction; second sensing electrodes extending on the sensing region in the second direction and arranged in the first direction; and first sensing signal lines connected to the first sensing electrodes, respectively, through a contact part overlapping the sensing region, wherein a length of each of the first sensing electrodes in the first direction is greater than a length of each of the second sensing electrodes in the second direction, and the first sensing electrodes have a same length in the sensing region.