Wearable Display Surface Acoustic Wave Sensing for Power Reduction
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Solution Overview
Problem
Wearable ring-shaped display panels often display the entire area regardless of the user's perspective, leading to unnecessary power consumption as only parts of the display are visible, and the entire area being lit results in inefficient information viewing.
Innovation Solution
A wearable display apparatus with a surface acoustic wave transmission layer, input and output transducers, and a control device that modulates surface acoustic waves to determine a target area for display based on the device's bent state, pressure, and temperature, allowing only visible areas to be active and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the entire display area is kept active, then the display information is complete, but the power consumption increases unnecessarily
Solution Approach 1:
The display area is divided into multiple sub-display areas corresponding to different sensor regions. Each sub-display area can be independently controlled to display or remain dark based on whether its corresponding sensor region detects user interaction, allowing selective activation of display segments to reduce power consumption while maintaining information completeness.
Solution Approach 2:
Different regions of the display are activated with different qualities based on local sensor detection. When a sensor region detects touch or proximity, the corresponding local display area is activated to show relevant information, while other regions remain dark. This creates local quality variations in display activation that optimize power consumption based on actual viewing needs.
2Loss of information
If the entire display area is activated, then all information is visible, but the user experience deteriorates when only partial areas are viewable
Solution Approach 1:
The display is segmented into multiple independently controllable sub-display areas that correspond to sensor regions. This segmentation allows the system to activate only the specific display portions that are currently viewable by the user, improving viewing experience by avoiding dark areas while maintaining information completeness through selective activation.
Solution Approach 2:
The display activation state is dynamically adjusted based on real-time sensor detection. As the user moves or interacts with the device, the system dynamically determines which sub-display areas should be active and which should remain dark, creating a dynamic viewing experience that adapts to user position and maintains optimal information visibility.
3Adaptability or versatility
If surface acoustic wave transmission layer is added, then the display can detect bent state and pressure, but the device complexity increases
Solution Approach 1:
The surface acoustic wave transmission layer serves multiple functions simultaneously: it transmits surface acoustic waves for touch sensing, detects bent state through wave pattern changes, and detects pressure through wave speed variations. This multi-functionality reduces the need for separate sensing layers and structures, thereby limiting the increase in device complexity while achieving comprehensive adaptability.
Solution Approach 2:
The surface acoustic wave transmission layer acts as an intermediary between the user's physical interaction (touch, bending, pressure) and the display control system. It converts these physical states into detectable acoustic wave variations, which are then processed to determine display activation patterns, providing a unified interface for multiple sensing functions without requiring separate complex structures.
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 solution enables the display apparatus to determine and display only the relevant areas, reducing power usage while ensuring the user can view the necessary information effectively.
Implementation Method 1
at least one surface acoustic wave input transducer on the surface acoustic wave transmission layer and along a first direction, at an edge of the substrate, and configured to send out a first surface acoustic wave
Implementation Method 2
each surface acoustic wave output transducer being configured to receive a second surface acoustic wave resulted from the first surface acoustic wave being transmitted and modulated by the surface acoustic wave transmission layer
Implementation Method 3
the surface acoustic wave transmission layer includes a piezoelectric film and a surface acoustic wave transmission device layer that are sequentially stacked on the second surface of the substrate
Data Source
AI summary
A wearable display apparatus is provided. The wearable display apparatus includes: a substrate having first and second surfaces; a display component on the first surface; a surface acoustic wave transmission layer on the second surface; a surface acoustic wave input transducer configured to send out a first surface acoustic wave; a surface acoustic wave output transducer on the surface acoustic wave transmission layer, each surface acoustic wave output transducer and a corresponding surface acoustic wave input transducer being at an edge of the substrate to be adjacent to and spaced apart from each other, and each surface acoustic wave output transducer being configured to receive a second surface acoustic wave resulted from the first surface acoustic wave being transmitted and modulated by the surface acoustic wave transmission layer; and a control device, configured to control a target area of the display component to display.