Spectra-Camera Parallel Sensing for Display Testing
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Solution Overview
Problem
Current optical test equipment for display testing either lacks spatial resolution in single-point high accuracy systems or sacrifices accuracy for large spatial coverage in imaging systems, failing to simultaneously measure spectrum and colorimetric quantities with spatial resolution.
Innovation Solution
A hybrid optical test equipment, known as a spectra-camera, which combines a single-point high accuracy system, such as a spectrometer, with a low accuracy imaging system, such as a colorimeter, using an aperture mirror or beam splitter to split the display image for concurrent parametric and artifact testing, allowing for simultaneous measurement of spectrum and colorimetric quantities with spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-point high accuracy system (spectrometer) is used, then measurement precision is improved, but spatial coverage area deteriorates
Solution Approach 1:
The system segments the measurement task by dividing the optical path into multiple channels using beam splitters and dichroic mirrors. One channel directs light to a spectrometer for high-precision spectral measurement, while another channel directs light to a camera for wide spatial coverage, allowing each component to specialize in its strength
Solution Approach 2:
The integrated optical system performs multiple functions simultaneously: it captures spectral data for precise colorimetric measurement, captures spatial distribution data for artifact detection, and provides both types of data from the same measurement setup, eliminating the need to choose between single-point precision or area coverage
2Area of stationary object
If a low accuracy imaging system (colorimeter) is used, then spatial coverage area is improved, but measurement precision deteriorates
Solution Approach 1:
The system merges the capabilities of a spectrometer and a colorimeter into a single integrated measurement platform. The spectrometer provides reference spectral data for calibration and precise colorimetric quantities, while the colorimeter provides wide spatial coverage for artifact detection, and their data are combined to achieve both high precision and wide coverage
Solution Approach 2:
The system uses an intermediary calibration process where the spectrometer's high-precision spectral measurements serve as a reference standard to calibrate the colorimeter's spatial measurements. This intermediary calibration step allows the colorimeter's data to be corrected and enhanced to achieve high measurement precision across the entire spatial area
3Device complexity
If sequential testing is performed, then device complexity is reduced, but productivity deteriorates
Solution Approach 1:
The system performs spectral measurement and spatial artifact detection simultaneously and continuously through parallel optical paths. Both measurements occur at the same time from the same display region, eliminating the need for sequential testing and dramatically improving productivity without requiring complex switching mechanisms
4Measurement precision
If spectral measurement is performed, then measurement precision is improved, but loss of time deteriorates
Solution Approach 1:
The system uses periodic action by capturing spectral data at selected representative points rather than continuously across the entire display area. This periodic sampling approach maintains measurement precision for colorimetric quantities while significantly reducing the total measurement time compared to exhaustive spectral scanning of every region
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 efficient and accurate simultaneous display artifact and parametric testing, reducing test time and improving throughput by utilizing the high precision of spectrometers to calibrate imaging colorimeters, thereby achieving high accuracy across both small and large spatial areas.
Implementation Method 1
using an aperture mirror or beam splitter to split the display image for concurrent parametric and artifact testing
Data Source
AI summary
An optical test equipment/method for display testing that features parallel testing/sensing configuration that covers spectrum and colorimetric quantities with spatial resolution is disclosed. In one embodiment, a spectra-camera, which is a hybrid system consisting of both a single-point spectrometer and an imaging colorimeter, can be configured for concurrent display artifact and parametric testing. An aperture mirror with a hole in the middle splits an image of a test display into two parts. One part of the image passes through the hole and is directed to the spectrometer for display parametric testing. The rest of the image is reflected off the aperture mirror for concurrent display artifact testing with the colorimeter. In another embodiment, a beam splitter can be used instead of an aperture mirror. In yet another embodiment, the single-point high accuracy spectrometer can be used to calibrate the low accuracy imaging colorimeter.