Head-mounted Display Laser Splitter for Light Efficiency
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Solution Overview
Problem
Existing image display apparatuses mounted on the head have poor light usage efficiency due to the discarding of unnecessary light when shifting the optical axis of optical fibers, leading to suboptimal brightness and contrast ratios.
Innovation Solution
An image display apparatus that splits laser light into two beams of different optical intensities, where one beam is used for image drawing and the other for notification, allowing efficient use of light by adjusting the optical intensities and using a splitter with reflection films to combine and separate light beams effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical axis of an optical fiber is shifted to improve contrast ratio, then the contrast ratio is improved, but light usage efficiency deteriorates due to discarding unnecessary light
Solution Approach 1:
The patent divides the laser light into multiple wavelength components using a diffraction grating, separating them into different spatial directions. This segmentation allows each wavelength component to be utilized for different purposes (image projection and notification), preventing waste of any light component while maintaining high contrast ratio through selective optical path control.
Solution Approach 2:
The patent makes the laser light source serve multiple functions by directing different wavelength components to different uses. The same laser source simultaneously provides image projection light and notification light, eliminating the need for separate light sources and maximizing light usage efficiency while achieving both high contrast ratio and efficient light utilization.
2Productivity
If laser light is used for image drawing, then image drawing performance is achieved, but safety deteriorates due to high optical intensity
Solution Approach 1:
The patent segments the laser light by wavelength using a diffraction grating, directing different wavelength components to different functions. The blue light component is used for image drawing while the red light component is used for notification, allowing high-intensity laser operation for image quality while the notification function provides safety indication.
Solution Approach 2:
The patent introduces a diffraction grating as an intermediary element that separates the laser light into different wavelength components. This intermediary enables the system to simultaneously achieve high-intensity image drawing and safety notification by directing different spectral components to different destinations.
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 apparatus achieves efficient light usage by ensuring stable and safe optical intensities for image drawing while providing noticeable notifications, enhancing both the image drawing process and user awareness of the apparatus's operation.
Implementation Method 1
the splitter includes a reflection film that transmits part of the laser light
Implementation Method 2
a notification section that notifies other persons by diffusing the second laser light that the image drawing section is performing image drawing
Data Source
AI summary
A head-mounted image display apparatus includes: a light source that emits laser light; a splitter that splits the laser light into first laser light and second laser light having a different optical intensity than the first laser light; an image drawing section that causes the first laser light to be reflected off a mirror and causes the mirror to make pivotal motion to perform image drawing; a controller that controls the pivotal motion of the mirror; and a notification section that notifies other persons by diffusing the second laser light that the image drawing section is performing image drawing.