Near-Eye Display Optical Measurement With Automatic Focus Scanning
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Solution Overview
Problem
Conventional methods for testing the optical characteristics of near eye displays under different diopter conditions are inefficient, costly, and lack accuracy due to manual focusing and the use of unspecific commercially available lenses, leading to increased complexity and hardware volume.
Innovation Solution
An automated optical measurement system with a dedicated imaging module, image sensing module, and displacement generation module, controlled by a controller, which projects specific patterns, captures images, and adjusts focus automatically to improve efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual focusing method is used for testing optical characteristics under different diopter conditions, then testing can be performed, but testing efficiency is low and human resources are consumed
Solution Approach 1:
The system performs self-focusing automatically without human intervention. The controller controls the displacement generation module to drive the image sensing module to move, and the system automatically captures focus images and determines the focusing position, replacing manual focusing operations with an autonomous automated process
Solution Approach 2:
The patent replaces manual mechanical focusing operations with an automated control system that uses a displacement generation module to precisely position the image sensing module. The controller automates the entire focusing process based on captured images, substituting human mechanical adjustment with automated mechanical control
2Measurement precision
If commercially available camera lens with autofocus capabilities is used, then autofocus function is achieved, but imaging quality is suboptimal and measurement accuracy is questionable
Solution Approach 1:
The patent employs a dedicated imaging module specifically designed for near eye display testing rather than a general-purpose commercial lens. This specialized imaging module is optimized for the specific optical characteristics and requirements of NED testing, providing superior and more reliable imaging quality for this particular application
3Ease of operation
If commercially available lenses are integrated into testing equipment, then autofocus capability is added, but hardware volume increases and construction costs increase
Solution Approach 1:
The patent integrates the imaging module directly with the displacement generation module and controller into a unified automated focusing system. This merged design eliminates the need for separate commercial autofocus lenses and their associated mounting hardware, reducing overall system volume while maintaining autofocus functionality
Solution Approach 2:
The dedicated imaging module serves multiple functions: it provides both the optical imaging capability and the autofocus functionality that would otherwise require separate commercial components. This multi-functional design reduces the number of separate components needed, thereby reducing hardware volume
4Reliability
If dedicated imaging module is used, then excellent optical image quality is obtained, but system complexity increases
Solution Approach 1:
The patent combines the dedicated imaging module with the displacement generation module and controller into an integrated system. This merging approach allows the system to achieve excellent optical image quality through specialized hardware while managing complexity through unified control and integrated design
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 system achieves rapid autofocusing and high optical image quality, reducing hardware volume and improving testing efficiency and accuracy across various diopter conditions.
Implementation Method 1
the displacement generation module is adapted to displace the image sensing module in at least one dimension direction
Implementation Method 2
The imaging module is configured to face the near eye display... the image sensing module to capture the specific pattern to obtain at least one focus image
Data Source
AI summary
An automated optical measurement system and method for a near eye display are provided. A controller first controls the near eye display to display a specific pattern, then controls a displacement generation module to drive an image sensing module toward or away from an imaging module, and controls the image sensing module to capture the specific pattern to obtain focus images; and the controller performs focusing according to the focus images. Finally, the controller measures an optical characteristic of the near eye display. Accordingly, the focusing method used is to capture the specific pattern displayed by the near eye display while moving the image sensing module, and perform automatic focusing by comparing the capture results.