Wearable Display Layout With Air Gap for Ambient Light Sensing
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Solution Overview
Problem
Existing wearable electronic devices face challenges in balancing device portability with enhanced functionality without increasing size and weight, while maintaining performance and durability.
Innovation Solution
The design incorporates a transparent cover with a display assembly, a battery spaced apart to create an air gap, and a printed circuit board with electronic chips positioned to minimize electrical pin usage, along with a metal rear cover electrically isolated from the sidewall housing to form an antenna assembly, and strategic component placement to optimize space and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If components are densely packed to reduce device size, then device portability is improved, but manufacturing precision and assembly difficulty increase
Solution Approach 1:
The device is divided into multiple layers including display assembly, battery, PCB, and electronic chip with specific spatial relationships. The electronic chip is positioned between the display assembly and PCB, creating a segmented multi-layer structure that reduces overall device volume while maintaining manufacturability through standardized layer interfaces
Solution Approach 2:
The patent transitions from two-dimensional planar arrangement to three-dimensional stacked arrangement of components. The electronic chip is disposed in the vertical space between the display assembly and PCB, utilizing the Z-dimension to reduce footprint area while maintaining component accessibility and assembly feasibility
2Weight of moving object
If device size is reduced to improve portability, then device weight is reduced, but component integration complexity increases
Solution Approach 1:
Multiple functional components are merged into a compact stacked arrangement where the electronic chip integrates sensing functions (ambient light sensor, temperature sensor) that would traditionally require separate components. The air gap between battery and electronic chip serves multiple purposes: electrical isolation, thermal management, and mechanical spacing, reducing the need for additional isolation components
Solution Approach 2:
The electronic chip serves multiple functions including processing, ambient light sensing, and temperature sensing. The air gap structure provides electrical isolation, thermal management, and mechanical positioning simultaneously. This multi-functionality reduces the number of discrete components needed, simplifying integration despite compact dimensions
3Volume of moving object
If components are placed closer together to minimize device bulk, then device portability is improved, but signal transmission quality may deteriorate
Solution Approach 1:
The air gap between the battery and electronic chip acts as an intermediary that provides electrical isolation and reduces electromagnetic interference while maintaining compact device bulk. The PCB serves as an intermediary substrate that organizes signal paths and provides controlled impedance for reliable signal transmission despite close component spacing
Solution Approach 2:
The patent applies different spatial relationships to different components based on their signal requirements. The electronic chip is positioned with an air gap from the battery for electrical isolation, while maintaining close proximity to the display assembly for efficient signal transmission. The PCB provides localized signal routing with controlled characteristics for different signal types
Data Source
AI summary
An electronic device can include a display assembly including a display and a transparent cover defining an external surface, a battery, the display disposed between the battery and the transparent cover, a printed circuit board (PCB), and an electronic chip disposed on the PCB between the display assembly and the PCB. In some examples, the electronic chip can include an ambient light sensor. In such examples, the battery can be spaced apart from the electronic chip to define an air gap between the battery and the ambient light sensor.