Touchscreen Electrode Layout for Active Stylus Linearity
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Solution Overview
Problem
Current touch control screens with active styluses suffer from poor linearity accuracy due to inconsistent signal changes in different directions, leading to inaccuracies in position reporting.
Innovation Solution
The touch control screen is designed with intersecting sensing units, each comprising first and second sensing electrodes with trunk channels and branch electrodes arranged alternately, ensuring linear signal changes in both directions by employing multiple trunk channels and branch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rhombus sensing electrode pattern is used, then the touch control screen can detect active stylus input, but the linearity accuracy deteriorates due to inconsistent signal changes in different directions
Solution Approach 1:
The sensing electrode is segmented into multiple independent sensing units, each containing trunk channels and branch electrodes. This segmentation allows each unit to independently contribute to signal detection, enabling consistent signal changes in both horizontal and vertical directions, thereby improving linearity accuracy while maintaining active stylus detection capability
Solution Approach 2:
The invention transitions from a traditional single-direction or simple rhombus pattern to a two-dimensional grid arrangement with trunk channels extending in both horizontal and vertical directions. This dimensional expansion ensures that signal changes are consistent across both axes, resolving the linearity accuracy problem while preserving stylus detection functionality
2Device complexity
If a traditional sensing electrode pattern is used, then the device structure remains simple, but the position reporting accuracy deteriorates due to inconsistent signal trends
Solution Approach 1:
The electrode structure is divided into modular sensing units with standardized trunk and branch components. This segmentation maintains manufacturing simplicity through repeated modular units while achieving improved position reporting accuracy through the coordinated arrangement of multiple segments that ensure consistent signal behavior in all directions
Solution Approach 2:
The invention changes the geometric parameters of the electrode pattern by introducing trunk channels with specific extensions in orthogonal directions and configuring branch electrodes at defined intervals. These parameter changes enable consistent signal propagation characteristics without significantly complicating the overall device structure
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 design significantly improves linearity accuracy, allowing for precise position detection with active styluses by ensuring consistent signal changes in both horizontal and vertical directions.
Implementation Method 1
a first sensing electrode including at least one first trunk channel extending along the first direction and a plurality of first branch electrodes distributed on two sides of the first trunk channel
Data Source
AI summary
A touch control screen includes a plurality of sensing units having first sensing electrodes and second sensing electrodes. Each of the first sensing electrodes includes at least one first trunk channel extending along a first direction and a plurality of first branch electrodes electrically connected to the first trunk channel. Each of the second sensing electrodes includes at least one second trunk channel extending along a second direction and a plurality of second branch electrodes electrically connected to the second trunk channel. The second branch electrodes and the first branch electrodes are alternately arranged, so that a sensing signal change amount of the touch control screen tends to change linearly.