Virtual Image Diopter Adjustment in See-Through Displays
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Solution Overview
Problem
In see-through type image display devices, wearers with near-sightedness or long-sightedness require diopter adjustment for both virtual and external images, but existing technologies do not effectively address the diopter adjustment for virtual images.
Innovation Solution
An image display device with an image generating unit, a first optical system forming an intermediate image, a second optical system guiding light to the viewer, and intermediate image position changing means that adjusts the virtual image's depth position by changing the intermediate image's position, allowing for simple diopter adjustment of both virtual and external images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diopter adjustment for virtual images is added to see-through type image display devices, then visibility for wearers with near-sightedness or long-sightedness is improved, but device complexity increases
Solution Approach 1:
The patent combines the virtual image diopter adjustment function with the existing external light diopter adjustment mechanism. By using the same optical path and adjustment structure for both functions, the device achieves dual functionality without proportionally increasing complexity. The intermediate image position changing means serves both to adjust virtual image clarity and to maintain proper external light viewing, merging two adjustment needs into a unified system.
Solution Approach 2:
The adjustment mechanism is designed to serve multiple functions: it adjusts the diopter for virtual images, maintains the diopter adjustment for external light, and enables the optical system to handle both augmented reality and external viewing requirements. This multi-functionality reduces the need for separate adjustment mechanisms for different viewing modes.
2Measurement precision
If a complex adjustment mechanism is implemented for virtual image diopter, then adjustment precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent merges the virtual image adjustment with the external light adjustment into a single operational mechanism. The intermediate image position changing means is adjusted in a manner that simultaneously optimizes both virtual image clarity and external light viewing, allowing the user to perform one adjustment action that benefits both functions rather than requiring separate complex adjustments.
3Volume of moving object
If the first optical system is moved to adjust intermediate image position, then device size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements a movable first optical system that can be dynamically adjusted to change the intermediate image position. This dynamic adjustment capability allows the device to achieve diopter correction through position changes rather than requiring complex fixed optical structures, thereby reducing overall device size while managing manufacturing precision through adjustable mechanisms.
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
Enables easy and effective diopter adjustment for virtual images, improving visibility by balancing diopter scales for both virtual and external images, resulting in a more user-friendly and miniaturized device configuration.
Implementation Method 1
a first optical system that forms an intermediate image by condensing the image light
Implementation Method 2
a second optical system that guides a virtual image to eye of a viewer by deflecting the light from the intermediate image
Implementation Method 3
guides the light to the eye of the viewer by transmitting external light
Data Source
AI summary
An image display device is capable of easily adjusting a diopter scale with respect to a virtual image. The image display device includes an image generating unit that emits image light including image information, a first optical system that forms an intermediate image by condensing the image light, a second optical system that guides a virtual image to eyes of a viewer by deflecting the light from the intermediate image, and guides the light to the eyes of the viewer by transmitting external light, and an intermediate image position changing device that adjusts a position of the virtual image in depth direction by changing a position of the intermediate image.