Touch Panel Edge Accuracy via Reduced Channel Spacing
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Solution Overview
Problem
Conventional touch panels experience poor touch accuracy and linearity on edge areas due to the lack of reference channels and limited electrode pattern expansion caused by narrow bezels.
Innovation Solution
The touch panel design incorporates a plurality of first channels and third channels arranged on the edges, with reduced distances between channel axes and adjusted electrode widths to enhance touch sensing and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch units are arrayed over the entire surface with identical design, then manufacturing is simplified, but touch accuracy and linearity on edge areas deteriorate due to lack of reference channels
Solution Approach 1:
The patent applies local quality by designing different channel configurations for different regions of the touch panel. Edge areas have third channels with reduced spacing and adjusted electrode widths, while central areas maintain the original first channel design. This regional differentiation improves touch accuracy on edges without complicating the overall manufacturing process.
Solution Approach 2:
The touch panel is segmented into different functional zones: central areas with first channels and edge areas with third channels. This segmentation allows each zone to be optimized independently for its specific requirements, with edge channels having tighter spacing to provide adequate reference signals in regions where touch units have limited expansion space.
2Measurement precision
If touch electrode pattern is expanded outward to improve edge touch accuracy, then touch sensing on edges improves, but narrow bezels constrain the available expansion space
Solution Approach 1:
The patent changes the parameters of the third channels in edge areas by reducing the spacing between adjacent channels and adjusting the electrode widths. Specifically, the distance between a third channel and its adjacent first channel is smaller than the spacing between first channels, and the third channels have different electrode width configurations. These parameter adjustments enable improved edge touch accuracy within the constrained bezel space.
3Measurement precision
If third channels are added on edge areas with reduced spacing, then touch sensing amount increases and accuracy improves, but device complexity increases
Solution Approach 1:
The third channels serve multiple functions: they act as reference channels for edge touch units, provide sensing capability for edge areas, and maintain compatibility with the existing first channel architecture. This multi-functionality justifies the added complexity by delivering multiple benefits from a single design element.
Data Source
AI summary
The present application provides a touch panel and a touch device. The touch panel comprises first channels and third channels that extend in a first direction and are arranged side by side. By reducing a distance between the third channel and the adjacent first channel, a touch sensing amount of the third channel is increased, and touch operations have improved accuracy and linearity in an edge area.