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BS IEC 62906-5-7:2022

BS IEC 62906-5-7:2022

$167.15

Laser displays – Measuring methods of image quality affected by speckle for scanning laser displays

Published By Publication Date Number of Pages
BSI 2022 36
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PDF Pages PDF Title
2 undefined
4 English
CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms, and letter symbols
3.1 Terms and definitions
10 3.2 Abbreviated terms
11 3.3 Letter symbols
Table 1 – Letter symbols (quantity symbols / unit symbols)
12 4 Standard measuring conditions
4.1 General
4.2 Standard measuring environmental conditions
4.3 Standard measuring dark-room conditions
4.4 Standard DUT conditions
4.5 Standard LMD requirements
14 4.6 Screen requirements
5 Standard measurement setup and coordinate system
5.1 Direct measurement setup
15 5.2 Diffuse reflectance standard measurement
Figures
Figure 1 – Setup and coordinate system of direct illuminance measurements
16 5.3 Full-screen measurement
Figure 2 – Setup and coordinate system of diffuse reflectance standard measurements
Figure 3 – Setup and coordinate system of full-screen measurements
17 6 Measuring methods
6.1 Wavelength/spectrum and photometric/colorimetric measurements
Figure 4 – Example of spectra of single-longitudinal mode RGB lasers
18 Figure 5 – Example of spectrum of multi-longitudinal modes
19 6.2 Monochromatic speckle contrast and colour speckle
6.2.1 General
6.2.2 Noise analysis of speckle
20 6.2.3 Measurement procedure
21 6.3 Speckle-affected image resolution
6.3.1 Grille patterns
6.3.2 Contrast modulation (grille-pattern contrast) under speckle effects
Figure 6 – Grille patterns in both horizontal and vertical directions
23 Figure 7 – Measured data of speckled grille pattern and lines along the grille direction
24 6.3.3 Measurement procedure
Figure 8 – Eye-diagram representation of normalized illuminance distribution of speckle
25 6.3.4 Colour speckle and dynamic colour speckle
26 Figure 9 – Example of chromaticity distribution for the colour speckleobserved in the uniform image region (CIE 1976 plot)
27 6.4 Non-uniformity/uniformity
6.4.1 General
6.4.2 Measurement points
6.4.3 Measuring method
Figure 10 – Example of dynamic colour speckle in a period (CIE 1976 plot)
28 Figure 11 – Non-uniformity measurement positions (rectangular pattern)
29 Figure 12 – Non-uniformity measurement positions (grille pattern)
30 Annex A (informative)Spectral accuracy for keeping a specific chromaticity accuracy
A.1 General
A.2 Calculated example of wavelength accuracy
Figure A.1 – Calculated wavelength accuracy to keep |Δu’|, |Δv’| < 0,001
31 Annex B (informative)Conventional contrast modulation (grille-pattern luminance contrast) for displays
Figure B.1 – Example of the measured grille pattern
32 Figure B.2 – Example of CM plot
33 Annex C (informative)Examples of speckle data for grille patterns
Figure C.1 – Example of visualized 2D-captured data for R, G, B monochromatic speckle, and for colour speckle of colour W (white)
34 Figure C.2 – Example of CM-speckle plot under the effects of speckle
35 Bibliography

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BS IEC 62906-5-7:2022
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