Smartglasses Frame Stiffness Matching for Display Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible frames in head-mounted computing devices like smartglasses can cause misalignment of displays due to deformation, leading to user discomfort and confusion, while rigid frames add weight and complexity to the device.
Innovation Solution
The frame is designed with a specified relationship between the bending stiffness of the nose bridge and shoulder materials, ensuring alignment of displays by maintaining proportional bending stiffness within a tolerance, such as less than 5%, to prevent misalignment without requiring complex control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible frame is used in head-mounted wearable devices, then the comfort and adaptability of the device are improved, but the alignment of the display is compromised due to frame deformation
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the bending stiffness parameters of different frame components. The nose bridge is designed with a first bending stiffness while the arm portions have a second bending stiffness, where these parameters satisfy a specific relationship. This parameter optimization allows the frame to be flexible enough for comfort while maintaining display alignment under various wearing conditions.
2Manufacturing precision
If a rigid frame is used to maintain display alignment, then the alignment precision is improved, but the device complexity and cost increase due to additional control systems
Solution Approach 1:
The patent implements self-service by designing the frame structure to automatically maintain display alignment through its inherent mechanical properties. The specific bending stiffness relationship between the nose bridge and arm portions causes the frame to self-correct and maintain proper geometry under various loading conditions, eliminating the need for external sensors, actuators, or control algorithms to maintain alignment.
Solution Approach 2:
By optimizing the bending stiffness parameters of the frame components, the patent achieves a passive solution where the physical parameters themselves enforce alignment. This approach replaces complex active control systems with a simpler design that relies on carefully selected material and structural parameters.
3Manufacturing precision
If a rigid frame is used to prevent misalignment, then the display alignment is maintained, but the weight of the device increases
Solution Approach 1:
The patent uses parameter changes by selecting appropriate bending stiffness values that balance structural support and weight. Rather than using fully rigid materials that would increase weight, the design specifies particular stiffness parameters that provide sufficient alignment maintenance while allowing the use of lighter materials and more efficient structural designs.
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
This solution maintains display alignment even with frame deflections, reducing user confusion and discomfort while avoiding the need for costly and complex control systems, thus ensuring comfortable and efficient operation.
Implementation Method 1
the nose bridge being formed of a first material having a first bending stiffness. The frame further includes a left arm portion forming a left shoulder with the left rim portion, and a right arm portion forming a right shoulder with the right rim portion, each of the left shoulder and right shoulder being formed of a second material having a second bending stiffness
Data Source
AI summary
Improved augmented reality smartglasses ensure alignment of displays in a head-mounted wearable device such as AR smartglasses by specifying a relationship between material properties of the frame at the shoulder and nose bridge. For example, such a material relationship may be a rigidity and/or stiffness characteristic. In some implementations, the specified relationship is that a difference between the first bending stiffness and the second bending stiffness is less than a tolerance (e.g., 5%, 1%, or less than 1%).