3D Input Device Using Intersecting Resistors for Pressure Detection
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Solution Overview
Problem
Touch panels currently only provide two-dimensional information and are unable to include Z-direction information, limiting their capability to offer three-dimensional input.
Innovation Solution
An input device with an insulating layer and resistors arranged in intersecting directions, where the resistance value between electrodes changes continuously with applied pressure, allowing for the detection of pressure magnitude and coordinates, enabling three-dimensional input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional touch panels (resistive-type or capacitive-type) are used, then two-dimensional input information can be provided, but three-dimensional information including Z-direction pressure data cannot be provided
Solution Approach 1:
The patent transitions from two-dimensional touch detection to three-dimensional pressure detection by incorporating vertical stacking of sensor elements. Multiple sensor arrays are arranged in the thickness direction (Z-axis) of the panel, enabling detection of pressure magnitude in addition to X-Y coordinates. This dimensional extension allows the system to provide comprehensive three-dimensional input information without requiring completely separate detection mechanisms.
Solution Approach 2:
The touch panel is divided into multiple sensor arrays stacked in the thickness direction, with each array capable of independent detection. This segmentation allows different layers to detect different aspects of touch input (e.g., contact presence, pressure magnitude), and the results are combined to provide full three-dimensional information. The segmented structure enables complex functionality while maintaining manageable individual component complexity.
2Measurement precision
If multiple sensor arrays are stacked in the thickness direction, then three-dimensional information can be detected, but the device structure becomes more complex
Solution Approach 1:
Multiple sensor arrays that would individually provide limited detection capability are merged into a single integrated touch panel structure. The stacked arrays work together as a unified system, where the combination of their outputs enables accurate three-dimensional measurement. This merging approach achieves high measurement precision while avoiding the complexity of managing completely separate detection systems.
Solution Approach 2:
The multi-layer sensor structure serves multiple functions simultaneously: detecting touch contact, measuring pressure magnitude, and providing three-dimensional spatial information. Each sensor array layer contributes to these multiple functions, making the complex structure worthwhile by achieving versatile detection capabilities that would require separate systems otherwise.
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 input device effectively provides three-dimensional information, enhancing detection accuracy and sensitivity, and enabling precise control operations based on pressure magnitude, while maintaining a high signal-to-noise ratio and allowing for swift touch detection.
Implementation Method 1
upon the first resistors and/or the second resistors being pressed, a resistance value between the pair of electrodes associated with pressed one or more of the first resistors and the second resistors changes continuously in accordance with a magnitude of applied pressure
Data Source
AI summary
The input device includes an insulating layer, a plurality of first resistors arrayed on one side of the insulating layer with a longitudinal direction thereof extending in a first direction, a plurality of second resistors arrayed on an opposite side of the insulating layer with a longitudinal direction thereof extending in a second direction intersecting the first direction, and a pair of electrodes provided at opposite ends of a corresponding one of the first resistors and the second resistors, wherein upon the first resistors and/or the second resistors being pressed, a resistance value between the pair of electrodes associated with pressed one or more of the first resistors and the second resistors changes continuously in accordance with a magnitude of applied pressure.