Eyepiece Optical Layout With Intermediate Pupil for Sharp Vision Correction
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Solution Overview
Problem
Conventional optical systems with digital display units lack a clear conjugate equipment pupil, leading to unsharp images and bothersome aberrations when the eye position deviates from the eye box, and fail to provide effective correction for vision defects without the need for spectacles.
Innovation Solution
An optical system with a digital display unit that includes a wavefront manipulator and filter unit at the intermediate pupil, allowing for adjustable spherical aberration and image correction, and a large eye box with minimal aberrations, enabling comfortable use without spectacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a digital display unit is used in an optical system, then the system can provide flexible image display and electronic signal processing, but the system lacks a conjugate equipment pupil leading to unsharp images and chromatic aberrations when eye position deviates from optimal viewing area
Solution Approach 1:
The patent introduces a conjugate equipment pupil as an intermediary optical element between the digital display unit and the observer's eye. This intermediary structure provides reference information for eye position detection, enabling the system to maintain image sharpness and reduce chromatic aberrations even when the eye moves away from the optimal viewing position, thus resolving the contradiction between display flexibility and image precision
Solution Approach 2:
The conjugate equipment pupil creates optical feedback by forming an image of the display unit's pixel structure on the observer's retina. This feedback mechanism allows the observer's visual system to automatically detect and correct eye position deviations, maintaining image quality without requiring active control systems, thereby preserving adaptability while ensuring manufacturing precision
2Ease of operation
If the eye box is enlarged to allow greater eye movement, then observer comfort and ease of operation improve, but image quality deteriorates due to lack of equipment pupil guidance
Solution Approach 1:
The conjugate equipment pupil acts as an intermediary that provides optical guidance information to the observer's visual system. This mediator enables the eye to self-correct its position within an enlarged eye box by detecting the position of the equipment pupil image, thus maintaining image quality while allowing greater eye movement freedom and improving observer comfort
3Device complexity
If no aperture stop is used in the digital display system, then the system design is simplified, but disturbing effects such as aliasing and moiré patterns increase
Solution Approach 1:
The conjugate equipment pupil serves as an optical intermediary that inherently filters light paths between the digital display unit and the observer's eye. This intermediary structure acts as a natural aperture stop that reduces aliasing and moiré effects by limiting the angular range of light rays, thus eliminating disturbing effects without adding complex active control mechanisms
Solution Approach 2:
The patent converts the potentially harmful pixel structure of the digital display unit into a beneficial optical reference. By allowing the pixel structure to form an image on the retina through the conjugate equipment pupil, the system transforms what could be a source of aliasing into a useful guidance mechanism for eye position detection, thereby reducing disturbing effects while maintaining design simplicity
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
Provides a sharp and natural image perception with adjustable aberration correction, allowing for comfortable use across various viewing angles and reducing the need for spectacles, enhancing user experience and image quality.
Implementation Method 1
targeted correction of spherical aberrations
Implementation Method 2
reduction of disturbing effects like aliasing and moiré
Implementation Method 3
reduction of disturbing effects like aliasing and moiré
Implementation Method 4
the eyepiece is used to virtually image a real intermediate image of an image representation for a human eye
Data Source
AI summary
An optical system includes a display configured to display an image and including an eyepiece for observing the image. The eyepiece includes a first lens group and a second lens group. An intermediate pupil is arranged between the first lens group and the second lens group. The second lens group is configured to image the image displayed by the display into the intermediate pupil. The first lens group is configured to image the image arranged in the intermediate pupil into a spatial region. The intermediate pupil and the spatial region are conjugate to one another. A filter unit and/or a wavefront manipulator is/are arranged at the intermediate pupil.