Touchscreen UI Alignment for Low-Resolution Touch Grids
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Solution Overview
Problem
Touch screens with low touch resolution relative to graphical resolution experience inaccuracies and ergonomic issues, particularly on large screens, leading to user interaction errors.
Innovation Solution
A method and device that adjust the position and dimensions of graphical interface elements on the screen to minimize the number of detection areas they cover, aligning edges with detection grid boundaries, and resize elements to match the touch panel resolution, thereby improving pointing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch panel uses low resolution to reduce cost, then manufacturing cost is reduced, but pointing accuracy deteriorates
Solution Approach 1:
The system performs preliminary alignment by calculating and adjusting the positions of graphical interface elements before display, ensuring they are positioned at coordinates that align with the touch panel's detection grid. This pre-alignment prevents pointing errors without requiring higher resolution hardware
Solution Approach 2:
The system changes the positional parameters of graphical interface elements dynamically, adjusting their coordinates to match the touch panel's detection grid. This parameter adjustment ensures that element positions correspond to actual detection area boundaries, maintaining accuracy despite lower resolution
2Measurement precision
If the touch panel uses high resolution to improve pointing accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary calculations to determine optimal positions for graphical interface elements that align with the existing detection grid, rather than requiring a finer grid. This approach maintains accuracy while avoiding the complexity of higher-resolution hardware
3Adaptability or versatility
If graphical interface elements are positioned without alignment to detection grid, then layout flexibility is improved, but selection accuracy deteriorates
Solution Approach 1:
The system performs preliminary positioning calculations that account for the detection grid structure, determining optimal locations for interface elements that maintain both alignment accuracy and design flexibility
Solution Approach 2:
The system adjusts the positional parameters of interface elements to align with detection grid boundaries while maintaining functional layout requirements, achieving both accuracy and flexibility through coordinate transformation
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
Reduces selection errors by ensuring that pointing actions are accurately interpreted at the intended graphical object, enhancing user experience on touch screens with low touch resolution.
Implementation Method 1
Capacitive screens operate by touch, not by pressure. They comprise a glass panel crossed by an electrically charged conductive grid. When a conductive object, such as a finger or a suitable stylus, comes into contact with the glass panel, the electric field is changed at the location of the contact. The device determines the position of one or more points of contact by evaluating the changes in electric field using a mesh of electrodes.
Implementation Method 2
They comprise a glass panel crossed by an electrically charged conductive grid. When a conductive object, such as a finger or a suitable stylus, comes into contact with the glass panel, the electric field is changed at the location of the contact.
Data Source
AI summary
A method for controlling a touch screen including a display adapted to display at least one graphical interface element with a first graphical resolution, and a touch surface including a plurality of detection areas forming a detection grid whose touch resolution is lower than the first resolution. The method being such that it includes steps of determining a display position of a graphical interface element on the display such that the number of detection areas covered by the graphical interface element is minimal, displaying the graphical interface element at the determined position and triggering a function associated with the graphical interface element when a contact is detected in a detection area covered by the graphical interface element. Other aspects relate to a device for performing such a method and a touch screen including the device.