Dimming Apparatus for High Contrast AR Displays
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Solution Overview
Problem
Display apparatuses struggle to provide high contrast virtual images while allowing users to safely interact with real environments, especially in bright conditions, due to insufficient contrast and interference from external light.
Innovation Solution
A display apparatus with a frame-mounted image display and dimming apparatus that adjusts external light intensities, featuring a light blocking rate that decreases from outer regions to the center, ensuring high contrast and safe interaction with the real environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dimming apparatus is used to block external light, then contrast of virtual images is improved, but visibility of real environment deteriorates
Solution Approach 1:
The dimming apparatus is configured with a light blocking rate that varies by region: the peripheral region has a higher light blocking rate to improve virtual image contrast, while the central region has a lower light blocking rate to maintain visibility of the real environment. This spatial variation in light blocking properties resolves the contradiction between these two requirements.
2Illumination intensity
If light blocking rate is increased to improve virtual image contrast, then color tone accuracy deteriorates
Solution Approach 1:
The dimming apparatus applies different light blocking rates to different regions: the peripheral region uses a higher light blocking rate for improved contrast, while the central region uses a lower light blocking rate to preserve color tone accuracy. This regional differentiation allows both requirements to be satisfied simultaneously.
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 enables high contrast virtual images and safe interaction with the real environment by adjusting light blocking rates across the dimming apparatus, ensuring proper color tone and visibility.
Implementation Method 1
a light blocking rate of the dimming apparatus decreasing from an upper region and an outer-side region of a virtual-image-forming-region facing region toward a central portion of the virtual-image-forming-region facing region
Data Source
AI summary
It is an object of the present invention to provide a display apparatus having a configuration and a structure that enable virtual images to be observed by an observer to exhibit high contrast, and enable the observer who uses the display apparatus to safely act in a real environment while reliably recognizing an external environment. A display apparatus of the present invention includes: a frame to be mounted to a head of an observer; an image display apparatus attached to the frame; and a dimming apparatus 700. The image display apparatus includes an image forming apparatus, and an optical apparatus 120 having a virtual-image forming region 701 in which virtual images are formed. The optical apparatus 120 overlaps with at least a part of the dimming apparatus 700. When the dimming apparatus 700 operates, a light blocking rate of the dimming apparatus decreases, for example, from an upper region and an outer-side region of a virtual-image-forming-region facing region 701 toward a central portion of the virtual-image-forming-region facing region.