Stepped Arc Touch Panel Sensing Lines for Azimuth Coverage
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Solution Overview
Problem
Conventional touch screens with circular or non-rectangular designs face challenges in providing comprehensive touch sensing functions due to discontinuous wiring along the circumferential direction, which limits the distribution of sensing lines and prevents complete coverage of azimuth ranges.
Innovation Solution
The implementation of a touch panel with first sensing lines comprising multiple arc and straight segments, where each segment has different radii and covers distinct azimuth ranges, intersecting with second sensing lines to ensure comprehensive touch sensing across all azimuths without the need for reserved wiring spaces for leads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If wires are distributed along the circumferential direction to achieve circular touch screen design, then the circular shape is realized, but the sensing coverage is incomplete due to discontinuous wiring and reserved wiring spaces
Solution Approach 1:
The sensing lines are divided into multiple segments arranged in a stepped configuration, with each segment extending from a different radial distance toward the center. This segmentation allows the sensing lines to cover the entire azimuth range without requiring continuous circumferential wiring, thereby achieving complete sensing coverage while maintaining the circular shape.
Solution Approach 2:
The sensing lines transition from a two-dimensional circumferential arrangement to a three-dimensional stepped configuration with radial depth variation. By introducing the radial dimension, the sensing lines can overlap and cover the full azimuth range without requiring reserved wiring spaces, resolving the contradiction between circular shape and sensing coverage.
2Ease of manufacture
If reserved wiring spaces are provided for outer leads to connect circumferential wires, then the wiring function is achieved, but the touch sensing function is lost in those azimuth ranges
Solution Approach 1:
The wiring function is extracted from the sensing line structure itself. The sensing lines are designed to extend directly to the periphery and connect to driving circuits without requiring separate outer leads or reserved wiring spaces. This eliminates the need to sacrifice sensing coverage for wiring connections.
Solution Approach 2:
The sensing lines serve dual functions: they provide touch sensing coverage across all azimuth ranges while simultaneously serving as the wiring path to connect to driving circuits. This multi-functionality eliminates the need for separate wiring spaces, allowing both wiring and sensing to coexist without compromise.
3Reliability
If sensing lines are extended directly to panel periphery without reserved wiring spaces, then comprehensive touch sensing is achieved, but the wiring layout complexity increases
Solution Approach 1:
The wiring layout is segmented into multiple stepped sections, each with a simple linear configuration extending from a specific radial distance to the periphery. This segmentation breaks down the complex wiring requirement into manageable segments that can be systematically arranged, reducing overall layout complexity while achieving comprehensive sensing coverage.
Solution Approach 2:
The sensing lines follow curved arc paths rather than straight lines, adapting to the circular geometry of the touch screen. This curved configuration naturally accommodates the circular shape while maintaining systematic spacing and positioning, simplifying the wiring layout process compared to forcing straight-line connections in a circular geometry.
Data Source
AI summary
A touch panel including first sensing lines and second sensing lines is provided. The first sensing lines are separated from each other. Each of the first sensing lines includes first arc segments and first straight segments. Each of the first straight segments is connected between two adjacent first arc segments. Different first arc segments have different radii about a center and cover different ranges of azimuth about the center. The second sensing lines are separated from each other and are intersected with the first sensing lines.