Wearable Display Transparent Screen Magnifying Lens Background Visibility
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Solution Overview
Problem
Wearable display devices often suffer from limited background visibility due to narrow visual angles and complex optical systems, making them difficult to use in everyday situations.
Innovation Solution
A wearable display device featuring a transparent screen with a cholesteric liquid crystal layer exhibiting selective and diffuse reflectivity, combined with a magnifying lens that covers part of the screen, allowing for inclined reflection of images to enhance background visibility and widen the visual angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wearable display device covers the entire field of view with a display, then the display visibility is improved, but the background visibility deteriorates and the user cannot check the surrounding situation
Solution Approach 1:
The field of view is segmented into two distinct regions: a first region for displaying images with high visibility and a second region for viewing the background. This segmentation allows the display to provide full field of view coverage while preserving background visibility in a dedicated area, resolving the contradiction between display visibility and background visibility.
2Object-affected harmful factors
If a wearable display device allows background viewing with image projection, then the background visibility is improved, but the visual angle for viewing images becomes narrow
Solution Approach 1:
The patent introduces a spatial dimension by creating distinct first and second regions within the field of view. The first region is optimized for image display with appropriate visual angle characteristics, while the second region provides background viewing capability. This dimensional separation resolves the contradiction between background visibility and image visual angle by allocating different spatial zones for different functions.
3Object-affected harmful factors
If a wearable display device uses a complex optical system to achieve wide visual angle and background visibility, then the background visibility and visual angle are improved, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary complex optical components by采用 a simplified optical system that achieves both wide visual angle and background visibility through the region segmentation approach. Instead of using complex optical elements to manipulate light paths, the invention uses a more straightforward configuration that separates display and background viewing functions into different regions, thereby reducing device complexity while maintaining the desired performance.
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 provides good background visibility and a wide visual angle while maintaining a simple structure, improving the usability of wearable display devices by allowing users to see both projected images and their surroundings effectively.
Implementation Method 1
the transparent screen has a cholesteric liquid crystal layer exhibiting selective reflectivity
Implementation Method 2
a magnifying lens for viewing the image reflected from the transparent screen is disposed on a viewing side to cover at least a part of the transparent screen
Implementation Method 3
a bisector of an angle between an incoming ray from at least one direction onto the transparent screen and a specularly reflected ray of the incoming ray
Data Source
AI summary
According to the present invention, it is possible to provide a wearable display device having good background visibility, a wide visual angle capable of viewing projected images, and a simple structure. The wearable display device includes at least a transparent screen and a projection device which projects an image on the transparent screen, in which a magnifying lens for viewing the image reflected from the transparent screen is disposed on a viewing side to cover at least a part of the transparent screen.