Near Eye Display Characterization System Using Beamsplitter and Spectroradiometer
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Solution Overview
Problem
Traditional optical metrology equipment is inadequate for testing near eye displays (NEDs) due to their unique optical systems and user interactions, leading to challenges in achieving dependable and predictable performance, especially in consumer, avionics, and military applications.
Innovation Solution
A compact optical radiance collection system with adjustable entrance pupil and rotatable components, combined with a digital camera and spectroradiometer, allows for precise measurements of luminance, color, and contrast within the design eye box, enabling accurate characterization of NED performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical metrology equipment is used for NED testing, then the equipment structure is simple and easy to operate, but the measurement precision and reliability are insufficient due to the unique optical systems of NEDs
Solution Approach 1:
The measurement system is divided into multiple independent modules: a light source module, a beamsplitter module, a reference arm module, and a measurement arm module. Each module performs a specific function, allowing the complex measurement task to be broken down into manageable components that can be optimized independently while maintaining overall measurement precision.
Solution Approach 2:
A beamsplitter is introduced as an intermediary component to separate the light path into reference and measurement arms. This allows the system to simultaneously capture both the optical path differences and the actual NED output characteristics, improving measurement precision without requiring a complete redesign of the entire measurement system.
2Measurement precision
If a compact optical radiance collection system is designed to fit within limited NED space, then the device complexity is reduced and ease of operation is improved, but the measurement precision and capability may be compromised
Solution Approach 1:
The optical components are arranged in a nested configuration where the measurement path is integrated within the existing NED optical train. The beamsplitter is positioned to divide the light path without requiring additional external space, and the detection optics are nested within the NED housing, maintaining compact form factor while preserving measurement capability.
Solution Approach 2:
The measurement system utilizes the temporal dimension by employing modulated light sources and synchronous detection techniques. This allows the system to extract measurement information from the NED output without requiring additional spatial dimensions, effectively maintaining a compact footprint while achieving high measurement precision through time-based signal separation.
3Adaptability or versatility
If multi-configuration NED performance characterization is implemented, then the adaptability and versatility are improved, but the device complexity and measurement time increase
Solution Approach 1:
The measurement system is designed with universal components that can characterize multiple NED configurations using the same optical path and detection methodology. The beamsplitter-based architecture allows the system to measure various optical parameters (luminance, color, contrast, uniformity) across different NED types without requiring separate measurement setups, reducing both device complexity and measurement time while maintaining high adaptability.
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 provides high-precision measurements of luminance, color, and contrast across the field of view, ensuring consistent user experience and compliance with performance standards, while fitting within the limited space of NED devices.
Implementation Method 1
a beamsplitter, positioned to reflect a portion of the light from the light source
Implementation Method 2
The light from the light source is directed through a beamsplitter, positioned to reflect a portion of the light from the light source
Implementation Method 3
A controller circuit and associated circuitry perform spectroradiometric measurements on the captured image of the defined measurement area
Data Source
AI summary
System and method for performance characterization of multi configuration near eye displays includes: a mirror; a lamp; a beamsplitter; a collimating and reflective lens for collimating light reflected from the beamsplitter and reflecting it back towards an image sensor having a view finder; a field-of-view (FOV) aperture to project light from the lamp onto the DUT through the objective lens; a video viewfinder digital camera for capturing an virtual image of the DUT; a spectroradiometers for performing spectroradiometric measurements on a captured image of the defined measurement area to characterize the performance of the DUT; and a controller circuit for characterizing performance of the DUT based on the spectroradiometric measurements.