Asymmetric Optical Element Adjustment for Head-Mounted Display Aberration Correction
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Solution Overview
Problem
Existing display devices with optical systems that adjust for eccentric aberrations, such as astigmatism and coma, often result in image position shifts, causing discomfort and mismatched images during binocular vision, especially in head-mounted displays.
Innovation Solution
A display device with an optical system featuring an image light generation device, a projection optical system including an asymmetric optical element, and adjustment mechanisms to correct the position of the optical element and the image light emission region, ensuring proper alignment and resolution without shifting the image position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the anamorphic lens is shifted in a direction perpendicular to the optical axis to adjust eccentric aberrations, then the resolution of the image is improved, but the position of the image in the observer's field of view is shifted from a desired position
Solution Approach 1:
The patent separates the adjustment functions into two independent mechanisms: the first adjustment mechanism shifts the anamorphic lens to correct eccentric aberrations (astigmatism and coma), while the second adjustment mechanism shifts the image light generation device to adjust image position. This segmentation allows each mechanism to perform its specific function without interfering with the other, resolving the contradiction between resolution improvement and position alignment.
Solution Approach 2:
The patent introduces an image light generation device as an intermediary element that can be independently adjusted relative to the projection optical system. By shifting this intermediary device, the image position can be corrected without affecting the aberration correction achieved by the anamorphic lens positioning, thus mediating between the two conflicting requirements.
2Manufacturing precision
If the anamorphic lens is shifted to correct eccentric aberrations, then the resolution is improved, but the positions of the images do not match between the left and right eyes during binocular vision
Solution Approach 1:
The patent divides the adjustment system into two independent segments: one for aberration correction (shifting the anamorphic lens) and one for position matching (shifting the image light generation device). This allows each eye's optical system to be independently adjusted for both resolution and binocular alignment, ensuring that eccentric aberrations are corrected without compromising inter-ocular image position matching.
3Manufacturing precision
If the optical element position is adjusted to correct aberrations, then image quality is improved, but additional adjustment complexity is introduced
Solution Approach 1:
The patent combines the adjustment of two critical parameters (aberration correction and position alignment) into a coordinated two-step process using two specialized mechanisms. Rather than creating a single complex mechanism that handles both functions, the patent merges two simpler, dedicated mechanisms that work together, reducing overall system complexity while achieving superior image quality.
Data Source
AI summary
A display device of the present disclosure includes an optical system, the optical system including an image light generation device configured to generate image light, a projection optical system including an optical element, the optical element including an optical surface asymmetric in a direction along at least a first axis of two axes orthogonal to each other and perpendicular to an optical axis of the image light, a support member configured to support the optical element, a first adjustment mechanism configured to adjust a position of the optical element in the direction along the first axis, and a second adjustment mechanism configured to adjust a position of an emission region of the image light in the direction along the first axis.