Fan-Shaped Touch Screen Electrodes for Irregular Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch screen technologies with strip electrode structures are not suitable for irregular-shaped screens due to varying electrode lengths, which affect signal stability and contact position resolution, making them unsuitable for applications like circular watches.
Innovation Solution
A touch screen design featuring mutually insulated fan-shaped first touch sensing electrodes arranged in a circle and non-overlapping ring-shaped second touch sensing electrodes, with specific electrical connections and arrangements to enhance signal stability and resolution, including the use of third touch sensing electrode wires and electrical bridges for improved precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If strip electrode structures are used in irregular-shaped touch screens, then the touch screen can be manufactured with conventional structures, but the varying lengths of strip electrodes cause different resistances that degrade signal stability and touch control precision
Solution Approach 1:
The touch sensing electrode is divided into multiple electrode segments (first touch sensing electrode segments and second touch sensing electrode segments) arranged in specific patterns. This segmentation allows each segment to have controlled electrical characteristics, enabling the construction of irregular-shaped touch screens with uniform resistance properties across different regions, thus maintaining signal stability while achieving desired shapes.
Solution Approach 2:
Different regions of the touch electrode are designed with different local characteristics through the segmentation approach. The first and second electrode segments are arranged to create specific electrical field distributions in different areas, allowing optimization of signal properties locally while maintaining overall signal stability across the entire irregular-shaped touch screen.
2Adaptability or versatility
If strip electrode structures are used in irregular-shaped touch screens, then the touch screen can accommodate various shapes, but the different electrode lengths cause varying resistances that reduce touch control precision
Solution Approach 1:
The touch sensing electrode is segmented into multiple sections with controlled electrical characteristics. This allows the touch screen to adapt to irregular shapes while maintaining uniform resistance properties across different segments, ensuring consistent touch control precision regardless of the overall screen shape or local electrode length variations.
Solution Approach 2:
The electrical parameters (resistance, capacitance) of different electrode segments are controlled and optimized to compensate for variations in electrode length. By adjusting the parameters of individual segments, the system maintains consistent measurement precision for contact position detection across the entire irregular-shaped touch screen.
3Measurement precision
If higher signal stability requirements are imposed on touch control chips to achieve high precision in irregular-shaped screens, then touch control precision can be improved, but the device complexity and cost increase
Solution Approach 1:
The touch electrode structure itself is designed to inherently provide stable signals through its segmented configuration. The first and second electrode segments are arranged to automatically compensate for resistance variations, reducing the need for complex signal processing and high-performance touch control chips, thus lowering device complexity while maintaining high precision.
Solution Approach 2:
The design converts the potential harm of irregular electrode lengths and resistance variations into a benefit by using segmented electrodes with controlled electrical characteristics. This approach transforms what would be a source of instability into a feature that enhances signal stability, reducing requirements for complex touch control chip functionality.
Data Source
AI summary
The present disclosure discloses a touch screen and a touch positioning method thereof, and a display device. The touch screen comprises: a plurality of mutually insulated fan-shaped first touch sensing electrodes and a plurality of mutually insulated and non-overlapped second touch sensing electrodes mutually insulated from the first touch sensing electrodes. The fan-shaped first touch sensing electrodes are arranged in a circle, and each of the second touch sensing electrodes is shaped like a non-closed ring concentrically arranged with the circle.