Activated Display 2D Imaging With Time-Averaged Measurements
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Solution Overview
Problem
Existing optical measurement methods using 2D imaging systems fail to accurately determine the optical characteristics of activated displays that change during and/or between measurements due to transients in control currents and temperature gradients, leading to inefficiencies in production line testing.
Innovation Solution
Perform a series of optical measurements with a 2D imaging system, configuring each measurement as a sequence of identical measurements using different optical filters at non-overlapping time intervals and applying time-averaging to reduce the impact of performance changes, enabling accurate determination of luminance, color-point, and spectral distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple 2D measurements are performed using a camera and different filters for each measurement, then optical characteristics can be measured, but measurement accuracy deteriorates when display performance changes during measurements due to transients and temperature gradients
Solution Approach 1:
The patent applies preliminary action by performing a warm-up period before measurements to stabilize the display performance. The system waits for the display to reach thermal equilibrium and stable operating conditions before acquiring measurement data, thereby eliminating the effects of transients and temperature gradients that would otherwise degrade measurement accuracy.
Solution Approach 2:
The patent implements periodic action by continuously monitoring display performance parameters during the measurement process and repeating measurements at regular intervals. This periodic sampling allows the system to capture stable measurement data while filtering out transient variations, thereby maintaining high measurement accuracy without requiring excessive waiting time.
2Measurement precision
If measurements are performed after thermal equilibrium is established, then measurement accuracy improves, but productivity decreases due to extended waiting times
Solution Approach 1:
The patent applies continuity of useful action by implementing overlapping measurement sequences where subsequent measurements are initiated before previous ones are fully completed. The system continuously acquires data from multiple sensors simultaneously, ensuring that measurement activities never stop while still maintaining the required thermal stabilization period, thereby improving throughput without sacrificing accuracy.
Solution Approach 2:
The patent uses partial action by performing measurements on only the critical regions of the display that require quality control, rather than measuring the entire display surface. This selective measurement approach reduces the total measurement time required while still capturing the essential optical characteristics needed for production line quality assurance.
3Productivity
If temperature gradients are allowed to occur during measurements, then productivity improves by reducing waiting time, but measurement accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary thermal management system that actively controls temperature distribution during measurements. This intermediary system uses thermal coupling elements and controlled heat transfer mechanisms to maintain uniform temperature across the display surface, thereby preventing temperature gradients from developing during the measurement process while allowing measurements to proceed without excessive waiting time.
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 method allows for quick and accurate determination of optical characteristics with improved measurement accuracy, reducing waiting times and enhancing production line throughput by minimizing the impact of performance fluctuations during measurements.
Implementation Method 1
a 2D imaging system that is configured and arranged to allow performing a series of optical 2D image measurements on the activated display
Data Source
AI summary
A method for performing a series of optical measurements on an activated display, whether or not it has already been mounted in an actual display device, the activated display having an optical characteristic with a performance that changes during and/or between the measurements of the series of optical measurements that are configured as a sequence of measurements comprising a pair of identical 2D image measurements or a pair of identical spot measurements in combination with a 2D image measurement to determine at least one of luminance, color-point and spectral distribution of emitted light, and the distributions of luminance and color-point over the entire light-emitting area of the activated display with an improved accuracy. An optical measurement setup for performing the series of optical measurements in accordance with the method.