Touch Panel Cell Geometry for Uniform Edge Sensitivity
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Solution Overview
Problem
Existing touch panels exhibit varying touch input sensitivity based on position, with edges often having reduced sensitivity compared to the central area.
Innovation Solution
A touch panel design with distinct cell shapes and electrode configurations in central and edge areas, including diamond, circular, rectangular, and triangular shapes, and specific electrode patterns to enhance uniform touch input sensitivity across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform touch cell shapes are used across the entire touch panel, then manufacturing is simplified, but touch input sensitivity becomes non-uniform with reduced sensitivity at edges
Solution Approach 1:
The patent applies different touch cell shapes to different regions of the touch panel: diamond-shaped cells in the central area and rectangular cells in the edge areas. This local differentiation optimizes touch sensitivity uniformly across the entire panel by adapting cell geometry to regional requirements, resolving the contradiction between manufacturing simplicity and sensitivity uniformity.
2Manufacturing precision
If different touch cell shapes are used in central and edge areas, then touch input sensitivity uniformity is improved, but device complexity increases
Solution Approach 1:
The touch panel is segmented into distinct regions (central area and edge areas) with different touch cell configurations. This segmentation allows each region to be optimized independently for its specific functional requirements, achieving uniform sensitivity across the panel while managing complexity through systematic regional division.
Solution Approach 2:
Different touch cell shapes are assigned to different regions: diamond-shaped cells in the central area for optimal multi-touch detection and rectangular cells in edge areas for enhanced linear touch sensitivity. This local quality approach ensures each region has the configuration best suited for its location, resolving the sensitivity uniformity issue.
3Ease of manufacture
If standard rectangular electrode patterns are used throughout, then manufacturing is easier, but edge area touch sensitivity remains insufficient
Solution Approach 1:
The patent implements different electrode configurations for different regions: the central area uses conventional electrode patterns while edge areas employ extended electrode patterns that protrude beyond the active display region. This local differentiation ensures reliable touch detection at edges without compromising manufacturing feasibility.
Solution Approach 2:
The electrode patterns in edge areas extend in the vertical direction beyond the active display region, utilizing the non-display area to enhance touch sensitivity. This dimensional extension allows edge touch detection to achieve reliability comparable to the central area while maintaining manufacturing simplicity.
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
Ensures consistent touch input sensitivity regardless of position on the panel, improving user interaction by maintaining sensitivity at the edges and central areas.
Implementation Method 1
the first electrode and the second electrode form mutual capacitances
Data Source
AI summary
A display device includes a plurality of touch cells, and a central area and an edge area. The plurality of touch cells is arranged in a first direction and a second direction crossing the first direction, and is located in the central area and the edge area. The edge area includes first to fourth sub-edge areas. Shapes of touch cells in the central area are different from shapes of touch cells in the edge area. Shapes of touch cells in the first and second sub-edge areas are different from shapes of touch cells in the third and fourth sub-edge areas.