Segmented Reflective Arrays for Large-Area Acoustic Touch Sensors
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Solution Overview
Problem
Current touch sensor technologies, particularly acoustic touch sensors using surface acoustic waves, face limitations in size due to physics and scientific principles, restricting their application to smaller areas without significant optical degradation of displayed images.
Innovation Solution
The development of an acoustic touch apparatus with a substrate that propagates surface acoustic waves, featuring segmented reflective arrays and waveguide cores to concentrate acoustic energy, allowing for larger touch sensors by reducing the distance surface acoustic waves need to travel and maintaining signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of acoustic touch sensors is increased, then the coverage area is improved, but the signal strength deteriorates due to longer propagation distance
Solution Approach 1:
The reflective array is divided into multiple segments positioned at different locations and orientations. Each segment reflects acoustic waves independently, creating multiple signal paths that converge at the sensor, thereby maintaining signal strength across larger sensor areas.
Solution Approach 2:
The reflective array segments are arranged in three-dimensional space with varying positions and angles rather than a simple planar expansion. This spatial arrangement creates multiple reflection paths that compensate for signal attenuation over distance, enabling large-area coverage while maintaining reliability.
2Reliability
If the distance surface acoustic waves need to travel is reduced, then the signal strength is improved, but the touch sensor area is reduced
Solution Approach 1:
By segmenting the reflective array into multiple distributed elements, the system creates multiple shorter propagation paths that collectively cover a large area. Each segment is positioned to reflect waves over shorter distances, maintaining signal strength while expanding coverage.
Solution Approach 2:
The segmented reflective array acts as an intermediary structure that redirects acoustic waves from multiple locations to the sensor. This intermediary arrangement effectively reduces the direct propagation distance while maintaining large-area coverage through strategic positioning of reflection points.
3Device complexity
If traditional acoustic touch sensor design is used, then the device complexity is low, but the maximum sensor size is limited
Solution Approach 1:
The reflective array is segmented into multiple independent elements that can be positioned and oriented differently. This segmentation enables large-area coverage while keeping each individual element simple in structure, maintaining overall device simplicity despite the expanded functionality.
Solution Approach 2:
The segmented reflective array structure serves multiple functions simultaneously: it reflects acoustic waves from different directions, creates multiple signal paths, and enables large-area coverage. This multi-functionality is achieved through a relatively simple geometric arrangement, avoiding excessive complexity.
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
Enables the creation of larger touch sensors, such as those with a diagonal length of 32 inches or greater, while maintaining signal integrity and minimizing optical degradation, thus expanding their application in interactive systems.
Implementation Method 1
a substrate configured to propagate surface acoustic waves
Implementation Method 2
a waveguide core configured to concentrate acoustic energy of the surface acoustic waves
Implementation Method 3
The reflective array may be configured to redirect at least a portion of the surface acoustic waves propagating within the substrate
Data Source
AI summary
Systems and related methods providing for touch sensors having segmented reflective arrays including waveguide cores are discussed herein. A touch sensor may include a substrate configured to propagate surface acoustic waves. The substrate may include two or more segmented reflective arrays. A segmented reflective array may include a major reflective array configured to propagate surface acoustic waves and a waveguide core configured to concentrate acoustic energy of the surface acoustic waves. Two segmented reflective arrays may further include adjacent portions that define an overlap region of the substrate. In some embodiments, the segmented reflective array may further include a beam dump configured to decrease intensity of surface acoustic wave propagation past the end of the segmented reflective array.