BSI PD IEC TR 62977-1-31:2021
$215.11
Electronic displays – Generic. Practical information on the use of light measuring devices
| Published By | Publication Date | Number of Pages |
| BSI | 2021 | 72 |
This part of IEC 62977 provides practical information on light measuring devices (luminance meters, colorimeters, and spectroradiometers) with luminance measuring optics for the characterization of electronic displays.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | CONTENTS |
| 8 | FOREWORD |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references 3 Terms, definitions, and abbreviated terms 3.1 Terms and definitions |
| 12 | 3.2 Abbreviated terms 4 General information on LMDs for photometry and colorimetry 4.1 General 4.2 Photometry and colorimetry for electronic displays |
| 13 | 4.3 LMDs for luminance and chromaticity measurements 4.3.1 Configuration of LMDs |
| 14 | Figures Figure 1 – Block diagrams of three types of LMDs Figure 2 – Example of configurations for the input optics and detector |
| 15 | 4.3.2 Input optics of LMDs 4.3.3 Electronic system of LMDs Figure 3 – Example of input optics for the luminance meters Figure 4 – Block diagram of a typical electronic system |
| 16 | 4.3.4 Calibration of LMDs 4.3.5 Maintenance of LMDs 4.4 Setup conditions for measurement 4.4.1 LMDs 4.4.2 DUTs 4.4.3 Environment 5 Influence of LMD properties on luminance and chromaticity measurements 5.1 General |
| 17 | 5.2 Repeatability 5.2.1 General 5.2.2 Example of the repeatability of an LMD Figure 5 – Examples of the repeatability of an LMD as a function of luminance |
| 18 | 5.3 Accuracy 5.3.1 General 5.3.2 Example of the accuracy of an LMD 5.3.3 Linearity Figure 6 – Examples of the accuracy of an LMD as a function of luminance |
| 19 | 5.3.4 Range change 5.4 Luminance range 5.5 Spectral properties of the spectroradiometer 5.5.1 General 5.5.2 Wavelength accuracy and spectral bandwidth |
| 21 | Figure 7 – Calculated relative luminance difference as a function of wavelength error |
| 22 | Figure 8 – Calculated relative luminance difference as a function of spectral bandwidth |
| 23 | Figure 9 – Calculated chromaticity differences as a function of wavelength error |
| 24 | Figure 10 – Calculated chromaticity differences as a function of spectral bandwidth |
| 25 | 5.6 Spectral properties of the filter-type luminance meter and colorimeter 5.6.1 General 5.6.2 Spectral responsivity |
| 26 | Figure 11 – Calculated relative luminance difference as a function of f1′ |
| 27 | 5.6.3 Methods to reduce the measurement difference Figure 12 – Calculated chromaticity differences as a function of f1′, xyz |
| 28 | 5.7 Angular response of LMDs 5.7.1 General 5.7.2 Subtended angles |
| 29 | 5.7.3 Consideration of the input optics Figure 13 – Angular aperture and measurement field angle Figure 14 – Calculated relative luminance difference and chromaticitydifference as a function of the angular aperture |
| 30 | 5.8 Measurement field 5.8.1 General Figure 15 – Diagram of light rays in object space telecentricand non-telecentric optical design |
| 31 | 5.8.2 Number of pixels within the measurement field 5.9 Polarization 5.9.1 General Figure 16 – Calculated chromaticity difference as a function of the number of pixels |
| 32 | 5.9.2 Polarization dependence of LMDs Figure 17 – Measured luminance variation as a functionof the rotation angle of the polarizer |
| 33 | 5.10 Temporal synchronization 5.10.1 General 5.10.2 Temporal synchronization of the LMD and DUT |
| 34 | 6 Influence of LMD properties on measurements of the optical characteristics of electronic displays 6.1 General 6.2 Contrast ratio 6.2.1 General 6.2.2 Calculated influence of LMD properties on the contrast ratio measurements Figure 18 – Calculated relative luminance differences as a function of sampling period |
| 35 | Tables Table 1 – DUT characteristics for the calculations |
| 36 | Table 2 – Calculated results of the contrast ratio by three LMDs |
| 37 | 6.3 Electro-optical transfer function (EOTF) 6.3.1 General 6.3.2 Calculated influence of the LMD properties on the EOTF measurements |
| 38 | 6.4 Chromaticity gamut area 6.4.1 General 6.4.2 Calculated influence of LMD properties on the chromaticity gamut area measurements Figure 19 – Total measurement times for 0,3 % repeatability (2σ) in three LMDs Table 3 – Calculated durations of the EOTF measurements |
| 39 | Figure 20 – Calculated relative difference, ΔGAxy, by spectroradiometers Table 4 – Chromaticity gamut area of three DUTs |
| 40 | 6.5 Viewing direction characteristics 6.5.1 General 6.5.2 Calculated influence of the LMD properties on the viewing direction characteristics measurements Figure 21 – Calculated relative difference, ΔGAxy, by colorimeters |
| 41 | Figure 22 – Cone of light rays for calculating the tristimulus values measured by an LMD with the angular aperture, α, and an optical axis at an inclination angle, θLMD |
| 42 | 6.5.3 Measurement field at an oblique direction Figure 23 – Calculated luminance and chromaticity dependence as a functionof the inclination angle for the 2°, 6°, and 10° angular apertures |
| 43 | 6.6 Spatial uniformity 6.6.1 General 6.6.2 Calculated influence of LMD properties on uniformity and non-uniformity measurements Figure 24 – Measurement field and test pattern |
| 44 | Table 5 – Non-uniformity of DUTs |
| 45 | 6.7 Response time 6.7.1 General 6.7.2 Measurement of the response time Figure 25 – Calculated non-uniformity difference by the filter-type colorimeters |
| 46 | Figure 26 – Measurement setups for response time measurements Figure 27 – Response curves measured at different sampling rates |
| 47 | Figure 28 – Measured response subjected to various low-pass filterings Table 6 – Rise times calculated from a measured responsesubjected to various low-pass filterings |
| 48 | 6.8 Flicker 6.8.1 General 6.8.2 Measurement method of the flicker Figure 29 – Measured response curves switched from the 10 % to 90 % level Table 7 – Rise times measured by LMDs of various V(λ) fidelities |
| 49 | 6.8.3 Low-pass filter of LMDs Figure 30 – Schematic measured temporal luminance modulationof the LCD with a common voltage offset |
| 50 | Figure 31 – Conceptual pseudo-temporal luminance modulation Figure 32 – Simulated luminance modulations with and without high frequency noise |
| 51 | Annex A (informative)Photometry and colorimetry A.1 General A.2 Photometry A.3 Colorimetry A.3.1 General |
| 52 | A.3.2 Standard colorimetric observer A.3.3 Tristimulus values A.3.4 Chromaticity diagram and colour space |
| 55 | Annex B (informative)Method for reducing the measurement difference of colorimeters B.1 General B.2 Matrix calibration methods for colorimeters B.2.1 Matrix calibration process 1: RGB calibration |
| 56 | B.2.2 Matrix calibration process 2: RGBW calibration |
| 58 | Annex C (informative)Input data in Clause 5 and Clause 6,and calculation methods in 5.8 and 6.5 C.1 General C.2 Characteristics of DUTs C.2.1 Spectral radiances of the DUTs Figure C.1 – Spectral radiances |
| 59 | C.2.2 Directional characteristic of the DUT C.2.3 Temporal modulation characteristics of the DUT C.2.4 EOTF characteristics of the DUTs Figure C.2 – Inclination angle dependence Figure C.3 – Temporal modulation of the luminance |
| 60 | C.2.5 Uniformity characteristics of the DUTs Figure C.4 – EOTF characteristics Table C.1 – Measured luminance and chromaticity at the nine positions of DUT-1 |
| 61 | C.3 Characteristics of the filter-type LMDs C.3.1 Spectral responsivities of the filter-type LMDs Table C.2 – Measured luminance and chromaticity at the nine positions of DUT-2 |
| 63 | C.3.2 Specifications of filter-type LMDs Figure C.5 – Spectral responsivity of the colorimeter |
| 64 | Figure C.6 – Repeatability of three LMD models Table C.3 – Specifications of filter-type LMDs |
| 65 | C.4 Influence of the number of pixels within the measurement field Figure C.7 – Three positions of a circular measurement field relative to the RGB stripes |
| 66 | C.5 Validity of the viewing direction dependence obtained by a simplified method Figure C.8 – Configuration to measure DUT emissionby the LMD at the inclination angle, θLMD |
| 67 | Figure C.9 – Inclination angle dependence calculated by two methodsusing an LMD with an angular aperture of 10° |
| 68 | Annex D (informative)Instabilities of DUTs in measurement D.1 General D.2 DUT instabilities Figure D.1 – Changes of luminance and chromaticity after switching the grey levels Table D.1 – Luminance and chromaticity transition |
| 69 | Figure D.2 – Changes of luminance after switching from the black to grey level Table D.2 – Luminance changes in two measurements |
| 70 | Bibliography |
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