Rigid Optical Chassis for Head-Worn Computer Stray Light Reduction
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Solution Overview
Problem
Head-mounted displays (HMDs) that provide a see-through view are affected by stray light, which reduces image sharpness and contrast, causing black areas to appear gray and affecting the see-through view by combining environmental light with displayed light.
Innovation Solution
A head-worn computer system with a rigid optical chassis and heat dissipation features, including a box structure with high thermal conductivity sections and a heat dissipation surface, aligns optical components precisely to minimize stray light, using a combination of optical and electrical components to enhance image clarity and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If optical components are mounted in a head-mounted display, then image display function is provided, but stray light is generated that reduces image sharpness and contrast
Solution Approach 1:
A rigid optical chassis serves as an intermediary structure between optical components and the head-mounted display frame. This chassis provides precise mechanical alignment references that ensure optical components are positioned with high precision, thereby minimizing stray light generation while maintaining the image display function.
2Adaptability or versatility
If multiple optical and electrical components are integrated in a compact head-worn device, then device functionality is enhanced, but heat generation increases
Solution Approach 1:
The internal structure is segmented into distinct functional zones: an optical section for mounting optical components with precise alignment features, and a thermal management section with high thermal conductivity materials and heat dissipation surfaces. This segmentation allows independent optimization of optical performance and thermal management while maintaining compact integration.
3Illumination intensity
If optical components are precisely aligned to reduce stray light, then image contrast is improved, but device complexity increases
Solution Approach 1:
The rigid optical chassis is pre-designed with integrated alignment references and mounting features that automatically ensure precise optical component positioning during assembly. This preliminary design of alignment features eliminates the need for complex adjustment mechanisms, achieving high image contrast through straightforward manufacturing and assembly processes.
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 system provides sharp, high-contrast images with dark black areas by effectively reducing stray light, improving the see-through view and overall display quality in head-worn computing systems.
Implementation Method 1
a rigid chassis comprising a box structure with high thermal conductivity sections, wherein the plurality of optical components are rigidly mounted to the chassis so that the displayed images are rigidly aligned relative to the cameras and to the left and right eyes of the user and the plurality of electrical components are mounted to the sections with high thermal conductivity to dissipate heat
Implementation Method 2
The chassis further includes a heat dissipation surface that is exposed to the external environment to promote heat dissipation to the environment
Implementation Method 3
The chassis further includes a heat dissipation surface that is exposed to the external environment to promote heat dissipation to the environment
Implementation Method 4
The heat dissipation surface includes ribs to improve heat dissipation
Implementation Method 5
a duct to increase air flow over the surface
Implementation Method 6
a fan to increase air flow over the surface
Data Source
AI summary
Head-worn computers may include a rigid optical chassis mechanically configured to provide a stable optical mounting reference plane with an image source reference plane, a first image source mounted on the image source reference plane and configured to project a first image light from the stable optical mounting reference plane to a combiner positioned in front of a user's eye when the head-worn computer is worn by the user, an outer frame configured to hold the optical chassis such that, when worn by the user, the first image light is aligned with the eye of the user, and an arm rotatably mounted on the outer frame and adapted to be positioned on a user's ear, wherein the arm comprises a battery compartment and a wire connected to at least the first image source.