Virtual Image Display Housing Structure for Glare Redirection
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Solution Overview
Problem
Conventional virtual image display devices suffer from reduced visibility due to glare caused by secondary reflection of external light onto the viewer's eyes, as insufficient measures are taken to manage the reflected light from the reflective mirror.
Innovation Solution
A virtual image display device with a housing structure featuring alternately arranged first and second walls that redirect external light away from the viewer's field of vision, preventing secondary reflection and maintaining clear visibility of the virtual image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective mirror is used to display virtual image, then the virtual image visibility is improved, but external light reflected by the reflective mirror causes glare and reduces visibility
Solution Approach 1:
The housing surface is segmented into multiple inclined walls (first walls and second walls) that are alternately arranged. Each wall segment redirects light in different directions, collectively preventing external light reflected from the reflective mirror from reaching the viewer's eyes while preserving the virtual image display function.
Solution Approach 2:
The housing surface is designed with localized inclined walls at specific positions where external light reflection occurs. These walls have specific inclination angles tailored to redirect harmful reflected light away from the viewer's field of vision, while leaving other areas unchanged to maintain normal light transmission for virtual image viewing.
2Ease of manufacture
If the housing surface is made smooth for easy manufacturing, then manufacturing cost is reduced, but external light reflects off the surface and reaches the viewer's eyes causing glare
Solution Approach 1:
Instead of creating a complex overall surface shape, the housing surface is divided into simple inclined wall segments that can be manufactured using standard techniques. Each wall is a simple geometric form, making the overall structure easier to manufacture despite the functional complexity of light redirection.
Solution Approach 2:
Only specific portions of the housing surface are given inclined wall structures at locations where external light reflection is problematic. The rest of the housing surface maintains its simple, easy-to-manufacture form, thus balancing manufacturing ease with glare prevention functionality.
3Illumination intensity
If the housing structure is modified to prevent external light reflection, then visibility is improved, but the device complexity increases
Solution Approach 1:
The housing surface is segmented into alternating first walls and second walls with different inclination angles. This segmentation allows each wall to be independently optimized for light redirection while maintaining a relatively simple overall housing structure that integrates seamlessly with the existing device architecture.
Solution Approach 2:
The inclined wall structure is applied locally only where needed to prevent external light reflection, rather than redesigning the entire housing structure. This localized approach minimizes the increase in device complexity while achieving the desired visibility improvement.
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 effectively prevents external light from reaching the viewer's eyes, enhancing the visibility of the virtual image by controlling the reflection direction and reducing interference with the display optical path.
Implementation Method 1
a reflective mirror that has a reflective surface to reflect the display light emitted from the display
Implementation Method 2
the transmitted light having traveled through the reflective mirror is efficiently absorbed by the heat-radiating member and converted into heat
Implementation Method 3
the converted heat is dissipated to the outside of the device through the outer wall
Implementation Method 4
an external light that enters the housing through the opening from an outside of the housing and is reflected by the reflective surface reaches the wall structure
Data Source
AI summary
A virtual image display device includes a display that emits display light, a reflective mirror that has a reflective surface, and a housing that houses the display and the reflective mirror and has an opening. The housing includes a wall structure on a portion of a surface of the housing. The wall structure includes a plurality of first walls that face in a first common direction and a plurality of second walls that face in a second common direction different from the first common direction. The plurality of first walls and the plurality of second walls are alternately arranged and are connected to each other one by one along the surface of the housing.