High Aspect Ratio Capacitive Sensor Panel Segmentation
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Solution Overview
Problem
High aspect ratio touch screens face challenges in maximizing touch screen real estate and display clarity due to the formation of wide bezels, increased panel thickness, and degraded touch sensing performance, which are exacerbated by the need for narrow trace widths and higher process accuracy.
Innovation Solution
The use of horizontally arranged row electrode blocks and vertically oriented column electrode segments, along with bus line sharing to reduce the number of routing traces, allows for a smaller bezel width and increased aspect ratio, while eliminating the need for additional layers and necked-down areas within the active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If long routing traces are formed outside the active area to accommodate high aspect ratio, then the touch screen can achieve high aspect ratio, but wide bezels are created reducing touch screen real estate
Solution Approach 1:
The touch sensor panel is divided into a first sub-panel and a second sub-panel, each with their own electrode structures and routing traces. This segmentation allows each sub-panel to have optimized, shorter routing traces that connect to fewer FPCs, eliminating the need for long routing traces across the entire high aspect ratio panel and reducing bezel width.
Solution Approach 2:
The invention transitions from a single continuous electrode structure to segmented electrode structures in multiple sub-panels. This dimensional reorganization allows routing traces to be localized within each sub-panel rather than extending across the full panel length, reducing the horizontal space required for routing and thereby reducing bezel width.
2Area of stationary object
If narrow trace widths are used to reduce bezel width, then bezel width is reduced, but process accuracy and uniformity control requirements increase
Solution Approach 1:
By segmenting the touch sensor panel into multiple sub-panels, the invention reduces the number of routing traces required in each sub-panel. This allows routing traces to maintain adequate width for manufacturability while still achieving reduced overall bezel width through the segmented architecture, avoiding the need for excessively narrow traces that would demand ultra-high process accuracy.
3Area of stationary object
If narrow trace widths and spacing are used to reduce bezel width, then bezel width is reduced, but trace line resistance and cross-coupling increase
Solution Approach 1:
The segmented sub-panel architecture reduces the total length of routing traces required in each sub-panel. Shorter traces inherently have lower resistance and reduced susceptibility to cross-coupling, allowing the invention to maintain adequate trace dimensions for reliable electrical performance while achieving reduced bezel width through the segmented structure.
4Shape
If additional layers and structures are added within the active area to accommodate high aspect ratio routing, then high aspect ratio is achieved, but panel thickness and manufacturing complexity increase
Solution Approach 1:
By dividing the touch sensor panel into multiple independent sub-panels, the invention eliminates the need for complex additional layers and structures within the active area that would be required to route traces across the full panel length. Each sub-panel uses standard routing architectures, simplifying the overall panel structure while achieving high aspect ratio through the segmented layout.
5Reliability
If routing traces are extended outside the active area to connect electrodes, then electrode connectivity is achieved, but the number of routing traces increases creating wider bezels
Solution Approach 1:
The invention segments the touch sensor panel into multiple sub-panels, each with localized electrode structures and routing traces. This segmentation reduces the number of routing traces required outside each active area compared to a single continuous panel, as each sub-panel connects to fewer FPCs. The cumulative effect across all sub-panels is a reduction in total bezel width while maintaining all necessary electrode connectivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces panel thickness, manufacturing costs, and parasitic capacitance, while enhancing touch sensing performance and optical uniformity, thereby increasing the available touch screen real estate and improving signal-to-noise ratios.
Implementation Method 1
Each of the column electrode segments can be coupled to a different one of the row electrode blocks to form capacitive touch nodes
Data Source
AI summary
High aspect ratio touch sensor panels are disclosed in which multiple row electrode blocks can be formed in a single row within an active area of the touch sensor panel, each row electrode block including a plurality of vertically adjacent row electrodes, or in some instances only one row electrode. In addition, each column electrode can be separated into multiple column electrode segments, each column electrode segment being vertically oriented and formed in a different column. The column electrode segments associated with any one column electrode can be spread out so that each of these column electrodes segments can be co-located and associated with a different row electrode block.