Aspherical Concave Mirror Optical System for Head-Mounted Display Viewing Angle
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Solution Overview
Problem
Head-mounted displays struggle to achieve a wide viewing angle with high display quality, as existing optical systems experience significant distortion outside the effective viewing field, limiting user experience and increasing costs.
Innovation Solution
The use of aspherical concave mirrors in combination with beam splitters in the head-mounted display's optical system, where the concave mirrors are arranged to reflect and focus display light, and the beam splitters transmit and reflect light to combine virtual and real-world views, while increasing distortion outside the effective viewing angle to enhance the viewing angle without degrading image quality within it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional optical system is used in head-mounted display, then the image quality within the effective viewing field is maintained, but the viewing angle is limited due to significant distortion outside the effective viewing field
Solution Approach 1:
The patent applies parameter changes by intentionally modifying the distortion characteristics of the optical system. Specifically, the optical system is designed to have increased distortion in the peripheral regions outside the effective viewing field, while maintaining low distortion within the effective viewing field. This parameter modification allows the display image to be seamlessly mapped across a wider viewing angle range, transforming the optical parameters to achieve both high image quality within the effective field and expanded viewing angle coverage.
2Adaptability or versatility
If the viewing angle is increased in head-mounted display, then the field of view is expanded, but the display quality degrades due to excessive distortion
Solution Approach 1:
The patent applies local quality by creating different distortion characteristics in different regions of the optical system. The optical system is designed with localized distortion control: the central region (effective viewing field) maintains low distortion for high image quality, while the peripheral regions have intentionally increased distortion to expand the viewing angle. This spatial variation in optical quality allows each region to be optimized for its specific function, achieving both wide viewing angle and high display quality where needed.
3Manufacturing precision
If high display quality is maintained across the entire viewing field, then image fidelity is improved, but the system complexity and cost increase
Solution Approach 1:
The patent applies partial action by providing high display quality only where it is most needed - within the effective viewing field - rather than uniformly across the entire viewing field. The optical system is designed to maintain low distortion and high image quality in the central effective viewing region, while accepting increased distortion in the peripheral regions. This selective quality distribution reduces optical system complexity and cost while maintaining adequate display quality for the primary viewing area.
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 allows for a wider viewing angle while maintaining high image quality within the effective field of view, reducing costs and size, and ensuring a seamless transition of the display image across the viewing field boundaries.
Implementation Method 1
a concave mirror which is aspherical, arranged in front of a user, and configured to reflect display light for forming a display image toward the user
Implementation Method 2
the concave mirror which is aspherical... in a range outside the effective viewing angle, a distortion exceeds 5% and increases toward an outside of a viewing field
Implementation Method 3
a beam splitter which is arranged between the concave mirror and the user, and configured to reflect the display light to the concave mirror
Implementation Method 4
transmit display light reflected by the concave mirror
Data Source
AI summary
A head-mounted display according to the present embodiment includes a combiner which is aspherical, arranged in front of a user, and configured to reflect display light for forming a display image toward the user, and a beam splitter which is arranged between the combiner and the user, and configured to reflect the display light to the combiner and transmit display light reflected by the concave mirror. In an optical system, in a range outside the effective viewing angle, the distortion exceeds 5% and increases toward an outside of a viewing field.