Brightness Colorimeter Polarization Error Correction

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Solution Overview

Problem

Existing brightness colorimeters face measurement errors due to linearly polarized light, which affects accurate determination of chromaticity and brightness, especially when the display device's arrangement changes.

Innovation Solution

A brightness colorimeter that converts linearly polarized light into circularly polarized light using a quarter wave plate, combined with a spectral module to branch light into three directions and filter modules to measure monochromatic light beams, ensuring accurate measurement of brightness and chromaticity regardless of the display device's orientation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a general brightness colorimeter measures chromaticity and brightness directly, then the measurement process is simple, but measurement errors occur due to linearly polarized light from display devices

Engineering Contradiction:

Improvechromaticity and brightness measurement accuracyVSAvoidcolorimeter structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

A polarization conversion module (quarter wave plate) is introduced as an intermediary component between the light source and the measurement sensors. This module converts linearly polarized light from the display device into circularly polarized light, eliminating measurement errors caused by polarization effects while maintaining overall system functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the polarization state parameter of the incident light from linear polarization to circular polarization by introducing a quarter wave plate. This parameter change eliminates the harmful interaction between linearly polarized light and the measurement system, thereby improving measurement accuracy without fundamentally redesigning the colorimeter structure

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the display device arrangement changes (lateral or longitudinal direction), then different applications are supported, but measurement values largely differ due to linearly polarized light

Engineering Contradiction:

Improvedisplay device arrangement flexibilityVSAvoidchromaticity and brightness measurement consistency

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The polarization conversion module serves as a universal intermediary that handles all incident light regardless of the display device's arrangement direction. By converting linearly polarized light to circularly polarized light before measurement, it ensures consistent measurement results whether the display is arranged laterally, longitudinally, or in any other orientation

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The modified colorimeter system becomes universally applicable to display devices in various arrangements and orientations. The polarization conversion module enables the measurement system to handle diverse configurations (lateral, longitudinal, different angles) while maintaining measurement consistency, thus achieving multi-functionality

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 solution enables reliable measurement of chromaticity and brightness with reduced errors, maintaining accuracy across different orientations of the display device by converting linearly polarized light into circularly polarized light, thereby improving measurement reliability.

Implementation Method 1

a polarization conversion module configured to intersect the light input through the lens module to convert polarization characteristics

Methodology Applied

Scientific EffectPolarization conversion: Polarisation

Implementation Method 2

a spectral module provided in one unit block to reflect and intersect the light input through the polarization conversion module so as to branch the light in different three directions

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 3

filter modules arranged on progress paths of the light branched in different three direction through the spectral module to intersect monochromatic light beams having specific spectra among the light branched in the three directions

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS10551301B2Brightness colorimeter having measurement error caused by linearly polarized light, which is corrected

Publication Date: 2020.02.04 ANI CORP LTD

AI summary

A brightness colorimeter having a measurement error caused by linearly polarized light, which is corrected, includes: a lens module to which light irradiated from one side is input; a polarization conversion module configured to intersect the light input through the lens module to convert polarization characteristics; a spectral module provided in one unit block to reflect and intersect the light input through the polarization conversion module so as to branch the light in different three directions; filter modules arranged on progress paths of the light branched in different three direction through the spectral module to intersect monochromatic light beams having specific spectra among the light branched in the three directions; and measurement modules arranged to correspond to exit angles of the monochromatic light beams penetrated through the filter modules, to measure at least one of a brightness, a chromaticity, and an error obtained by the monochromatic light beams.