Head-Mounted Display Axisymmetric Lens Offset Design
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Solution Overview
Problem
Conventional head-mounted displays with non-axisymmetric projection lenses increase manufacturing costs while aiming for high image quality and low distortion, and are often heavy and bulky.
Innovation Solution
The use of axisymmetric lens elements in a head-mounted display configuration, where the central axes of the first lens element and the lens element group are not overlapped, reduces manufacturing costs and maintains low distortion and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-axisymmetric projection lenses are used to achieve high image quality and low distortion, then image quality is improved, but manufacturing cost increases greatly
Solution Approach 1:
The patent applies asymmetry principle by deliberately designing the optical system with non-coincident central axes between the lens element group and the first lens element. This asymmetric configuration enables the use of simpler axisymmetric lenses while achieving the optical performance previously requiring complex non-axisymmetric lenses, thus reducing manufacturing cost while maintaining image quality
2Manufacturing precision
If conventional projection lens designs are used to achieve high image quality, then distortion is reduced, but the device becomes heavy and bulky
Solution Approach 1:
The patent segments the projection lens into multiple lens elements (including a lens element group and a first lens element with non-coincident central axes). This segmentation allows each element to be optimized for specific functions, achieving low distortion while using lighter materials and reducing overall device weight and size
Solution Approach 2:
The patent introduces a new dimensional parameter - the offset between central axes of different lens elements. By utilizing this additional degree of freedom in the optical design, the system achieves high image quality with simpler, lighter lens elements, avoiding the need for heavy bulky conventional designs
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 axisymmetric lens configuration results in a lightweight, slim head-mounted display with low distortion and high image quality, reducing manufacturing costs and enhancing user experience.
Implementation Method 1
The projection lens includes a first lens element and a lens element group... the projection lens has an image side and an object side... the image generator is configured at the image side
Data Source
AI summary
A head-mounted display including an image generator, a projection lens, and a waveguide is provided. The image generator is configured to provide an image beam. The projection lens is disposed on a path of the image beam. The projection lens has an image side and an object side. The image generator is configured at the image side. The projection lens includes a first lens element and a lens element group. The lens element group is disposed between the image generator and the first lens element. A first central axis of the first lens element and a second central axis of the lens element group are not overlapped. The waveguide is disposed on the path of the image beam and located at the object side of the projection lens.