Virtual Image Display Mirror Member Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing virtual image display devices, such as head-mounted displays, face challenges in achieving sufficient resolution and miniaturization due to incomplete aberration correction and the need for larger optical systems.
Innovation Solution
The virtual image display device incorporates a mirror member with a first surface that refracts imaging light and a second surface that reflects it, where the curvatures of the first and second surfaces differ, allowing for increased aberration correction without enlarging the optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve resolution performance, then aberration correction is enhanced, but the optical system becomes larger
Solution Approach 1:
The patent combines refraction and reflection functions into a single mirror member. The first surface refracts light while the second surface reflects light, merging multiple optical functions into one component. This reduces the total number of optical elements needed while maintaining aberration correction capability, thereby improving resolution without enlarging the optical system volume.
Solution Approach 2:
The mirror member is designed as a multi-functional optical element that simultaneously performs refraction at the first surface, reflection at the second surface, and aberration correction. This universal design allows one component to replace multiple specialized lenses, reducing overall system size while maintaining or improving resolution performance.
2Measurement precision
If anamorphic aspheric surfaces are used to correct aberration, then some aberration is corrected, but correction is incomplete in eccentric optical systems
Solution Approach 1:
The patent employs aspheric surfaces on both the first and second surfaces of the mirror member. The aspheric curvature profiles are specifically designed to correct various types of aberrations including spherical aberration, coma, and astigmatism. The curved surfaces enable more effective light control compared to flat surfaces, achieving more complete aberration correction in the eccentric optical system.
Solution Approach 2:
The mirror member features asymmetric design with different curvatures on the first surface and second surface. The first surface has a curvature optimized for refraction while the second surface has a curvature optimized for reflection. This asymmetric configuration allows tailored correction of different aberration types that occur at different stages of light propagation through the eccentric optical system.
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
This configuration enhances resolution performance and allows for miniaturization of the virtual image display device by increasing the number of surfaces capable of correcting aberration, thereby improving optical functionality.
Implementation Method 1
a first surface that refracts the imaging light that is incident from the light-guiding system
Implementation Method 2
a second surface that reflects the imaging light passed through the first surface
Implementation Method 3
the first surface of the mirror member refracts the imaging light reflected by the second surface out of the mirror member
Data Source
AI summary
A virtual image display device includes a display element, a light-guiding system configured to guide imaging light that exits the display element, and a mirror member having a first surface where the imaging light that exits the light-guiding system is incident while being refracted and a second surface that reflects the imaging light that passes through the first surface and causes the imaging light to exit the mirror member through the first surface where the imaging light is refracted. In the mirror member, the curvature of the first surface differs from the curvature of the second surface.