Touch Panel Electrode Layout for Uniform Stylus Signal Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-cell touch panels face challenges in accurately determining the touch location of a touch tool due to uneven signal distribution caused by sharp size and area changes in the touch electrode structure, particularly affecting the linearity and precision of active styluses.
Innovation Solution
A touch panel design featuring a plurality of repeating units with alternately arranged first and second electrodes, connected through conductive bridges, forming signal channels in perpendicular directions to ensure uniform signal distribution and accurate touch location detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a rhombic touch electrode structure is used, then the touch panel can be made thinner and lighter, but the electrode area changes sharply in the extension direction causing uneven signal distribution
Solution Approach 1:
The touch electrode is divided into multiple segments along the extension direction, with each segment having a controlled area. This segmentation prevents sharp area changes while maintaining the overall rhombic structure, thereby improving signal distribution uniformity without sacrificing the thin and light characteristics of the touch panel.
Solution Approach 2:
The electrode structure is designed with locally optimized properties where the width or area of electrode segments is adjusted in specific regions to compensate for signal distribution issues. This local quality adjustment ensures uniform signal distribution while preserving the overall lightweight design.
2Device complexity
If the touch electrode has sharp size change in extension direction, then the electrode structure is simplified, but the induction amount change becomes small at edge regions reducing touch detection accuracy
Solution Approach 1:
The electrode structure transitions from a static sharp-edged rhombic shape to a dynamic segmented structure where the effective electrode area varies gradually along the extension direction. This dynamic design ensures sufficient induction amount change at edge regions while maintaining relatively simple overall structure.
Solution Approach 2:
Instead of changing electrode area sharply in one dimension (the extension direction), the design introduces segmentation along the extension direction, effectively adding a dimensional aspect to the electrode structure. This allows the electrode to maintain simplicity while achieving gradual area transition for better touch detection accuracy.
3Ease of manufacture
If conventional touch electrode patterns are used, then the manufacturing process is straightforward, but linearity of touch tool response is poor
Solution Approach 1:
The touch electrode is segmented into multiple sections along the extension direction, with each segment having controlled dimensions. This segmentation can be integrated into existing manufacturing processes while significantly improving touch tool linearity by ensuring uniform signal distribution across the touch panel surface.
Solution Approach 2:
The electrode design modifies geometric parameters (width, segment length) along the extension direction to optimize signal distribution. These parameter changes are incorporated into the manufacturing process, maintaining ease of manufacture while achieving improved touch tool linearity and response uniformity.
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
The proposed design improves signal uniformity and linearity of touch tools by evenly distributing electrodes and reducing sharp changes in electrode area, enhancing the accuracy of touch location detection.
Implementation Method 1
The M second electrodes in the repeating unit are connected through a conductive bridge in the first direction
Implementation Method 2
When a finger of a user approaches the touch electrode structure, the detection circuit can detect that an induction amount on a touch electrode pattern at a location of the finger of the user changes
Data Source
AI summary
A touch panel, an electronic device, and a touch system are provided. The touch panel includes a plurality of repeating units arranged in an array, each repeating unit includes N first electrodes and M second electrodes that are alternately arranged in a first direction, and both N and M are integers greater than or equal to 3. First electrodes in repeating units that are adjacent in a second direction in the plurality of repeating units are connected in one-to-one correspondence, and extend in the second direction, and the second direction is perpendicular to the first direction. The M second electrodes in the repeating unit are connected through a conductive bridge in the first direction, and second electrodes in repeating units that are adjacent in the first direction in the plurality of repeating units are connected to each other.