Head-Mounted Display Color Correction via High Refractive Index Lenses
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Solution Overview
Problem
Head-mounted displays (HMDs) face challenges in achieving a compact size while providing a wide angle of view without yellowish tinting, as high refractive index members cause the image to appear yellow, and existing solutions lack specific configurations for implementation in HMDs.
Innovation Solution
Incorporating a colored optical member with a yellowness of a predetermined value or greater and a coloring correction optical member to correct the degree of coloring in the light path, using a combination of lenses with different refractive indices and Abbe numbers, and employing a convex lens with a high refractive index to maintain white balance without special image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a high refractive index member is applied to the optical system, then the device size is reduced and wide angle of view is achieved, but the image becomes tinged with yellow
Solution Approach 1:
The patent applies a yellowish optical member (with specific yellowness value ≥0.8) in the optical system to intentionally introduce yellow coloring, which is then corrected by image processing to achieve the desired white balance and eliminate the yellowish tint in the final displayed image
Solution Approach 2:
The patent changes the refractive index parameter of the optical member to a high value (≥1.7) to reduce device size and achieve wide angle of view, while simultaneously adjusting the yellowness parameter (≥0.8) and using image processing to correct the resulting color shift
2Weight of moving object
If a high refractive index member is applied to the optical system, then the device weight is reduced, but the image quality deteriorates due to yellowish tinting
Solution Approach 1:
The patent introduces a controlled yellowish tint through the optical member and then uses image processing to counteract this tint, thereby maintaining image quality while allowing the use of lighter high refractive index materials
Solution Approach 2:
The patent replaces the need for complex mechanical optical correction systems with software-based image processing to correct the yellowish tint, thereby reducing device weight while maintaining image quality
3Manufacturing precision
If a colored optical member is added to correct yellowish shift, then image color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the display element serve multiple functions: it not only displays the image but also performs color correction through image processing, thereby eliminating the need for separate complex optical correction components
Solution Approach 2:
The patent replaces potential complex mechanical optical correction systems with software-based image processing, thereby improving color accuracy while reducing device complexity
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
Enables the use of high refractive index members for reduced device size and weight while maintaining a wide angle of view and avoiding image degradation, reducing the burden of image processing and ensuring white balance across the image.
Implementation Method 1
light is transmitted through a prism sheet having a high refractive index, thereby correcting the yellowish shift that occurs
Data Source
AI summary
A head-mounted display includes an image display device including a panel unit serving as a display element configured to display an image, a colored optical member disposed on a light path of imaging light emitted from the panel unit and having a yellowness of a predetermined value or greater, and a coloring correction optical member configured to correct a degree of coloring of the imaging light of the entire light path in accordance with the yellowness of the colored optical member.