Touch Sensing Unit Multilayer Routing for Smaller Non-Display Areas
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Solution Overview
Problem
The self-capacitance manner in touch sensing units for display devices, such as tablet PCs and monitors, leads to an increase in the non-display area due to the increased number of touch lines, which hinders the expansion of the display area.
Innovation Solution
A touch sensing unit design with first and second sensor electrodes, first and second sensor lines, and sub-sensor lines arranged in specific configurations to minimize the non-display area, including overlapping and intersecting patterns across different layers and areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-capacitance manner is applied to increase touch sensitivity, then touch sensing capability is improved, but non-display area increases due to more touch lines
Solution Approach 1:
The patent introduces a multi-layer structure with sensor electrodes, sensor lines, and sub-sensor lines arranged in different layers (first layer, second layer, third layer). This vertical dimensionality allows touch sensing functionality to be distributed across multiple layers, reducing the horizontal space required for touch lines in the non-display area while maintaining touch sensitivity.
Solution Approach 2:
The touch sensing unit is segmented into multiple functional components: sensor electrodes for sensing, sensor lines for signal transmission, and sub-sensor lines for additional sensing or signal routing. This segmentation allows each component to be optimized independently and arranged in a configuration that minimizes the non-display area while maintaining sensing capability.
2Measurement precision
If more touch lines are added to improve touch sensing, then sensing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the multi-layer structure: sensor electrodes and sub-sensor lines in different layers work together to provide both sensing and signal transmission functions. This merging reduces the need for separate dedicated signal lines, thereby reducing overall device complexity while maintaining sensing precision.
Solution Approach 2:
The sensor lines and sub-sensor lines are designed to serve multiple purposes: they function as both sensing elements and signal transmission pathways. This multi-functionality reduces the total number of components needed, simplifying the device structure while maintaining precise touch sensing capability.
Data Source
AI summary
A touch sensing device includes first sensor electrodes disposed in a first area, second sensor electrodes disposed in a second area, first sensor lines each connected to the first sensor electrodes in the first area, and second sensor lines each connected to the second sensor electrodes in the second area. Each of the second sensor lines includes a first sub-sensor line disposed in the second area, and a second sub-sensor line disposed in the first area and the second area and connected to the first sub-sensor line.