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BS IEC 62906-5-4:2018:2022 Edition

BS IEC 62906-5-4:2018:2022 Edition

$198.66

Laser display devices – Optical measuring methods of colour speckle

Published By Publication Date Number of Pages
BSI 2022 54
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PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 1 Scope
2 Normative references
3 Terms, definitions, letter symbols and abbreviated terms
3.1 Fundamental terms
3.2 Terms related to colour speckle distribution
10 3.3 Terms related to spatial variation
3.4 Letter symbols
11 3.5 Abbreviated terms
4 Theory of colour speckle
4.1 General
4.2 Mechanism for generating colour speckle
13 5 Calculation methods of colour speckle
5.1 General
14 5.2 Measuring method of spectral behaviour of BGR light sources
5.3 Target chromaticity
Figures
Figure 1 – Two speckle measuring methods and their flow charts
15 Figure 2 – Target chromaticity and colour gamut
Figure 3 – SB,G,R(λ) with an FWHM of 2 nm
16 5.4 Adjustment of BGR power ratio
17 5.5 Calculation method (a) using BGR speckle contrast Cs-B, Cs-G, Cs-R
5.5.1 General
Figure 4 – Adjustment method of BGR power ratio
18 5.5.2 Examples of measured distributions
Figure 5 – Colour speckle distribution for CsB = 100 %, CsG = 100 %, CsR = 100 %
19 Figure 6 – Photometric speckle distribution for CsB = 100 %, CsG = 100 %, CsR = 100 %
20 Figure 7 – Colour speckle distribution for CsB = 50 %, CsG = 50 %, CsR = 50 %
Figure 8 – Photometric speckle distribution for CsB = 50 %, CsG = 50 %, CsR = 50 %
21 Figure 9 – Colour speckle distribution for CsB = 10 %, CsG = 10 %, CsR = 10 %
22 5.6 Evaluation metrics
Figure 10 – Photometric speckle distribution for CsB = 10 %, CsG = 10 %, CsR = 10 %
23 5.7 Calculation method (b) using the measured spatial distribution of BGR monochromatic speckles
5.7.1 General
5.7.2 Examples of measured distributions
Tables
Table 1 – Values of measurement metrics for the calculated examples
24 Figure 11 – Colour speckle distribution for CsB = 9,2 %, CsG = 9,7 %,CsR = 9,2 % obtained by method (b)
25 5.7.3 Comparison between methods (a) and (b)
Figure 12 – Colour speckle distribution for CsB = 9,2 %, CsG = 19,2 %,CsR = 23,2 % obtained by method (b)
26 Figure 13 – Colour speckle distribution for CsB = 9,2 %, CsG = 9,7 %,CsR = 9,2 % obtained by method (a)
Figure 14 – Colour speckle distribution for CsB = 9,2 %, CsG = 19,2 %,CsR = 23,2 % obtained by method (a)
27 5.7.4 Elimination of the background effects
Table 2 – Values of measurement metrics for the examples in Figure 11 to Figure 14
28 Figure 15 – Raw data of BGR speckle distributions (upper row) and post-processed data (lower row) for BGR monochromatic speckles (left: B, centre: G, right: R)
Figure 16 – Colour speckle distribution directly using the raw data in Figure 15
29 Figure 17 – Colour speckle distribution for CsB = 16,2 %, CsG = 17,4 %, CsR = 17,3 % obtained by indirect measuring method (a)
Table 3 – Values of measurement indices for the examples in Figure 16 and Figure 17
30 5.8 Error analysis based on data size
Figure 18 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 80 %
31 Figure 19 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 80 %
Figure 20 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 60 %
32 Figure 21 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 60 %
Figure 22 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 40 %
33 Figure 23 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 40 %
Figure 24 – Calculated average chromaticity values of the colour speckle distribution with respect to data size for CsB = CsG = CsR = 20 %
34 6 Direct measuring methods of colour speckle
6.1 General
Figure 25 – Calculated average values of the normalized speckle illuminance speckle distribution and the normalized monochromatic speckle intensity distribution with respect to data size for CsB = CsG = CsR = 20 %
35 6.2 Fundamental design of LMD for colour speckle measurement
Figure 26 – Example of LMDs using XYZ filters for colour speckle measurement
36 6.3 Colour speckle measuring method using LMD with XYZ filters
Figure 27 – Example of LMDs using BGR filters for colour speckle measurement
37 6.4 Colour speckle measuring method using LMD with BGR filters
Figure 28 – Example of measurement geometriesfor colour speckle using an LMD with XYZ filters
38 7 Measuring methods related to spatial variation
7.1 General
7.2 Angular colour speckle variation
Figure 29 – Example of measurement geometriesfor colour speckle using an LMD with BGR filters
39 7.3 Photometric speckle contrast uniformity/non-uniformity
Figure 30 – Representation of the viewing direction, or direction of measurement, defined by the angle of inclination θ, and the angle of rotation (azimuth angle ( )in a polar coordinate system
40 7.4 Colour speckle variance/covariance non-uniformity
41 Annex A (informative) Complementary explanation of colour speckle
Figure A.1 – Photograph of colour speckle
42 Annex B (informative) Examples of colour speckle distributions
B.1 Colour speckle distributions (one of the BGR: 90 %, the others: 1 %)
Figure B.1 – Colour speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 1 %
43 Figure B.2 – Photometric speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 1 %
44 Figure B.3 – Colour speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 1 %
Figure B.4 – Photometric speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 1 %
45 B.2 Colour speckle distributions (two of the BGR: 90 %, the other: 1 %)
Figure B.5 – Colour speckle distribution for CsB = 1 %, CsG = 1 %, CsR = 90 %
Figure B.6 – Photometric speckle distribution for CsB = 1 %, CsG = 1 %, CsR = 90 %
46 Figure B.7 – Colour speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 90 %
47 Figure B.8 – Photometric speckle distribution for CsB = 90 %, CsG = 1 %, CsR = 90 %
Figure B.9 – Colour speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 90 %
48 Figure B.10 – Photometric speckle distribution for CsB = 1 %, CsG = 90 %, CsR = 90 %
Figure B.11 – Colour speckle distribution for CsB = 90 %, CsG = 90 %, CsR = 1 %
49 Figure B.12 – Photometric speckle distribution for CsB = 90 %, CsG = 90 %, CsR = 1 %
50 Annex C (informative) Calibration of XYZ errors
C.1 General
C.2 Formulation of XYZ mismatches
51 Figure C.1 – Deviated values (marker points) and ideal colour matching functions
Figure C.2 – Correct plot by spectral measurements and plot with XYZ errors
Table C.1 – Mismatch coefficients
52 C.3 Calibration of the mismatched XYZ errors using the true BGR chromaticity values
53 Bibliography

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BS IEC 62906-5-4:2018
$198.66