Virtual Image Display Apparatus with Chromatic Aberration Correction
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Solution Overview
Problem
Existing virtual image display apparatuses, such as head-mounted displays, face challenges in reducing chromatic aberration of magnification while maintaining high performance, size, and weight efficiency, particularly when forming wide-angle or high-resolution images.
Innovation Solution
A virtual image display apparatus incorporating a light guiding member with a splitter portion and a light collecting mirror portion, featuring at least one correction lens surface, such as a spherical or aspherical surface, to correct chromatic aberration, and a prism-type member that integrates the splitter and light collecting mirror portions for a compact and efficient optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a simple optical system with a prism and one reflecting surface is used, then the apparatus weight and size are reduced, but chromatic aberration of magnification remains and optical performance deteriorates
Solution Approach 1:
The patent combines the light guiding function and chromatic aberration correction function into a single integrated light guiding member. The light guiding member includes both the reflecting surface for optical path folding and the correction lens surface for chromatic aberration correction, merging multiple functions into one component to avoid adding separate correction elements that would increase weight.
Solution Approach 2:
The light guiding member serves multiple functions: it guides light through reflection, corrects chromatic aberration of magnification through its correction lens surface, and maintains a compact form factor. This multi-functional design allows the apparatus to achieve high optical performance without proportionally increasing weight or size.
2Reliability
If multiple lenses are added to the optical system, then chromatic aberration is reduced, but the configuration becomes complicated and the number of components increases
Solution Approach 1:
Instead of adding separate correction lenses to the optical system, the patent integrates the chromatic aberration correction function directly into the light guiding member. The correction lens surface is formed as part of the light guiding member's structure, combining the light guiding and aberration correction functions in one component, thereby reducing system complexity.
Solution Approach 2:
The correction lens surface is positioned specifically at the light incident surface of the light guiding member, where it can effectively correct chromatic aberration for incoming light. This localized correction approach targets the specific location where aberration occurs without requiring multiple distributed correction elements throughout the system.
3Ease of operation
If a concave lens is disposed on the object side of the prism, then visibility is improved, but magnification differs from naked eye view and see-through quality deteriorates
Solution Approach 1:
The patent changes the optical parameters by forming a correction lens surface with specific curvature on the light incident surface of the light guiding member. This curvature is designed to correct chromatic aberration while maintaining appropriate magnification characteristics, improving both visibility and see-through quality simultaneously through optimized optical parameters.
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 reduces chromatic aberration and maintains high image quality, allowing for a small and lightweight apparatus that supports both virtual image display and see-through functionality with minimal aberration and distortion.
Implementation Method 1
a light guiding member which has a light collecting mirror portion that collects the video light via the splitter portion and folds back the light to the splitter portion, and emits the video light via the splitter portion and the light collecting mirror portion to an observer side. The light guiding member has at least one correction lens surface which corrects the chromatic aberration of magnification of the passed video light.
Implementation Method 2
a light guiding member which has a light collecting mirror portion that collects the video light via the splitter portion and folds back the light to the splitter portion
Data Source
AI summary
In an optical system having an extremely simple configuration configured by first and second prisms which are prisms in a flat shape and a reflecting surface provided in these prisms, in the first prism which is disposed on a side close to the eyes, that is, on a side apart from a video display element (video element) at a certain distance, a correction lens surface for correcting a chromatic aberration of video light is provided. Accordingly, a virtual image display apparatus is small and light, and has a high performance with a reduced chromatic aberration of magnification.