Flicker Measurement Device Adaptive Frequency Resolution

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Solution Overview

Problem

Conventional flicker measuring devices face errors due to discrete frequency resolution, which is insufficient for displays with individual differences in vertical synchronizing signal frequencies, leading to inaccurate measurements unless the target frequency matches the resolution, and increasing measuring time for higher resolution.

Innovation Solution

A flicker measuring device that detects light intensity changing frequencies, determines an integral submultiple frequency resolution based on these frequencies, and measures flicker with the determined resolution, allowing for accurate and quick measurements by obtaining waveform data and computing Fourier transforms to identify singular frequencies with higher intensities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a predetermined frequency resolution is used for flicker measurement, then the measurement process is simple, but measurement errors occur when the target frequency does not match the resolution frequency

Engineering Contradiction:

Improveflicker measurement accuracyVSAvoidfrequency resolution determination process

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing a preparatory measurement to detect possible light intensity changing frequencies before the actual flicker measurement. This allows the system to determine an appropriate frequency resolution in advance, ensuring accurate measurement without requiring complex real-time adjustments during the main measurement process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by making the frequency resolution adaptive rather than fixed. The frequency resolution is dynamically determined based on the detected light intensity changing frequencies of the specific display being measured. This allows the measurement system to adapt to different display characteristics and their individual frequency variations.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If a high frequency resolution is used to prevent measurement errors, then measurement accuracy improves, but measuring time extends significantly

Engineering Contradiction:

Improveflicker measurement accuracyVSAvoidmeasuring time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies partial action by using a two-stage measurement approach. A preliminary measurement is performed first to detect possible frequencies, followed by a main measurement using an optimized frequency resolution. This avoids performing a single excessively long high-resolution measurement, thereby reducing total measurement time while maintaining accuracy.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent implements parameter changes by adjusting the frequency resolution parameter based on the detected light intensity changing frequencies. Instead of using a fixed high frequency resolution throughout, the system determines an appropriate resolution level after preliminary detection, optimizing the balance between measurement accuracy and measurement time.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If discrete frequency resolution is used, then the measurement process is straightforward, but intensity distribution to adjacent frequencies causes errors at harmonic frequencies

Engineering Contradiction:

Improveharmonic frequency measurement accuracyVSAvoidfrequency determination process

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing spectrum analysis during a preparatory measurement phase to detect possible light intensity changing frequencies, including harmonics. This allows the system to identify all relevant frequency components before the main measurement, ensuring that the chosen frequency resolution properly captures harmonic frequencies without causing intensity distribution errors.

Inventive Principle:

Principle #10Preliminary action

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

This approach enables error-free and accurate flicker measurement by setting the necessary frequency resolution, reducing measuring time and minimizing errors at harmonic frequencies, while allowing user selection for specific frequency concerns.

Implementation Method 1

a light-receptive portion 11 to receive light to be measured from the measuring object 100

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Implementation Method 2

frequency spectrum data is obtained by computing a Fourier transform of the waveform data

Methodology Applied

Scientific EffectFourier Transform:

Data Source

PatentUS11651747B2Flicker measurement device and measurement method

Publication Date: 2023.05.16 KONICA MINOLTA INC

AI summary

Provided with: a detecting means to detect a possible light intensity changing frequency of a measuring object; a frequency determining means to determine a light intensity changing frequency with reference to the possible light intensity changing frequency; a resolution determining means to determine a frequency resolution for flicker measuring with reference to the determined light intensity changing frequency; and a flicker measuring means to conduct flicker measuring with the determined frequency resolution. The resolution determining means determines the frequency resolution to be an integral submultiple of the light intensity changing frequency determined by the frequency determining means.