Anamorphic Optical System for VR/AR Astigmatism Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display apparatuses for virtual reality (VR), augmented reality (AR), and mixed reality (MR) face challenges in correcting astigmatism when images are transmitted off-axis, leading to light loss and reduced efficiency.
Innovation Solution
An anamorphic optical system comprising a first correction lens with tangential power and a second correction lens with sagittal power, where the difference in distances to their respective images corresponds to the distance between the lenses, and at least one lens has an asymmetric stop to form tangential and sagittal images on the same surface, correcting astigmatism and enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an illumination system transmits image light on an off-axis, then the display apparatus can be applied to VR/AR/MR systems, but astigmatism occurs leading to light loss and reduced efficiency
Solution Approach 1:
The illumination system is divided into multiple functional components: a first correction lens for tangential astigmatism, a second correction lens for sagittal astigmatism, and an asymmetric stop. This segmentation allows each component to address specific aspects of the astigmatism problem independently, achieving comprehensive correction while maintaining off-axis transmission capability for VR/AR/MR applications
Solution Approach 2:
An asymmetric stop is introduced in the optical path to compensate for astigmatism caused by off-axis light transmission. The asymmetric geometry of the stop is specifically designed to balance the optical path differences between tangential and sagittal rays, reducing light loss and improving illumination efficiency while preserving the off-axis transmission function required for VR/AR/MR display systems
2Loss of energy
If correction lenses are added to correct astigmatism, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The first and second correction lenses serve dual functions: they correct astigmatism in the illumination system while simultaneously maintaining proper image formation on the display panel. The asymmetric stop also serves multiple purposes by correcting astigmatism and defining the optical aperture. This multi-functionality reduces the need for additional separate correction components, thereby improving light efficiency without proportionally increasing 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
The solution effectively corrects astigmatism in the illumination system, reducing light loss and increasing efficiency by forming tangential and sagittal images on the same surface, applicable to various types of display apparatuses including VR, AR, and MR systems.
Implementation Method 1
a first correction lens configured to have tangential power; a second correction lens configured to have sagittal power, wherein a difference between a first distance from the first correction lens to a tangential image formed by the first correction lens and a second distance from the second correction lens to a sagittal image formed by the second correction lens corresponds to a third distance between the first correction lens and the second correction lens
Data Source
AI summary
An anamorphic optical system and a display apparatus including the same are disclosed. The anamorphic optical system includes an illumination system having astigmatism, and first and second correction lenses that are provided to have tangential power and sagittal power respectively and correct the astigmatism in the illumination system. The first and second correction lenses are provided in which a difference between a distance from the first correction lens to a tangential image formed by the first correction lens and a distance from the second correction lens to a sagittal image formed by the second correction lens corresponds to a distance between the first correction lens and the second correction lenses, and at least one of the first correction lens and the second correction lens has an asymmetric stop to form the tangential image and the sagittal image on the same surface.