Light Field Near Eye Display Edge Aberration Correction
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Solution Overview
Problem
Current light field near eye display devices suffer from edge aberrations due to large-angle aberrations in micro-lens arrays, which degrade image quality and increase system costs when attempting to address these issues, and require precise alignment, complicating assembly.
Innovation Solution
Incorporating a second lens between the micro-lens array and the display element, with specific focal length relationships between the micro-lenses, the first lens, and the second lens to optimize optical parameters and reduce aberrations, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of micro-lens arrays is increased to eliminate large-angle aberrations, then edge imaging quality is improved, but system cost increases
Solution Approach 1:
A first lens is introduced as an intermediary optical element between the display element and the micro-lens array. This first lens pre-corrects the light beams before they reach the micro-lens array, reducing the angular spread of light and enabling the micro-lens array to effectively eliminate large-angle aberrations without requiring multiple arrays, thus improving edge imaging quality while controlling system cost
Solution Approach 2:
The patent optimizes the focal length parameters of both the first lens and the micro-lens array to achieve effective aberration correction. By carefully selecting and coordinating the focal length of the first lens (f1) with the focal length of the micro-lens array (fMLA), the system achieves superior edge imaging quality without increasing the number of micro-lens arrays, thereby avoiding increased system cost
2Manufacturing precision
If the number of micro-lens arrays is increased to eliminate large-angle aberrations, then edge imaging quality is improved, but assembly difficulty increases
Solution Approach 1:
The first lens serves as a mediator that simplifies the optical path before the micro-lens array, reducing the alignment precision requirements for the micro-lens array. By pre-conditioning the light beams, the system achieves effective aberration correction with a single micro-lens array, significantly reducing assembly difficulty compared to using multiple arrays that would require precise alignment
3Adaptability or versatility
If the field of view angle is increased, then display capability is improved, but edge aberrations increase
Solution Approach 1:
The optical system is segmented into two functional stages: the first lens handles the broad field of view angle requirement by pre-directing light beams from different angles, while the micro-lens array specifically addresses the edge aberration correction. This segmentation allows the system to achieve both a large field of view angle and high edge imaging quality simultaneously
Solution Approach 2:
The patent coordinates the focal length parameters of the first lens (f1) and the micro-lens array (fMLA) to optimize performance across the entire field of view. By adjusting these parameters, the system enables a larger field of view angle while the micro-lens array effectively corrects the edge aberrations that would otherwise increase with wider angles
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 effectively eliminates edge aberrations, improves edge imaging quality, and allows for a larger field of view without increasing system complexity or cost, enhancing the overall performance of light field near eye display devices.
Implementation Method 1
a micro-lens array, and transmits light field sub-images through optical elements such as a micro-lens array
Implementation Method 2
The first lens is located on the transmission path of the image light beam... The second lens is located on the transmission path of the image light beam... effectively eliminate edge aberrations
Data Source
AI summary
A light field near eye display device including a display element, a micro-lens array, a first lens, and a second lens is provided. The display element provides an image light beam. The micro-lens array is located on a transmission path of the image light beam, and has multiple micro-lenses. The first lens is located on the transmission path of the image light beam, where the micro-lens array is located between the first lens and the display element. The second lens is located on the transmission path of the image light beam, and located between the micro-lens array and the display element. The following formulas are satisfied:<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>1fMLA<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics>><semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>1f1<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics>,and<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>1fMLA<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics>><semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>1f2<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics>,where fMLA is an equivalent focal length of the micro-lenses, f1 is an equivalent focal length of the first lens, and f2 is an equivalent focal length of the second lens.