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BS IEC 62977-3-9:2023

BS IEC 62977-3-9:2023

$167.15

Electronic displays – Evaluation of optical performance. Display sparkle contrast

Published By Publication Date Number of Pages
BSI 2023 36
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and letter symbols
3.1 Terms and definitions
9 3.2 Abbreviated terms
3.3 Letter symbols
Tables
Table 1 – Letter symbols (quantity symbols and units)
11 4 Standard measurement conditions
4.1 Environmental conditions
4.2 Dark room conditions
4.3 Warm-up time
4.4 Measurement coordinate systems
Figures
Figure 1 – Cartesian coordinate system and spherical coordinate systemfor the specification of the viewer’s gazing (viewing) direction
12 4.5 Standard conditions for the measuring equipment
4.5.1 General
Table 2 – Distinguishing types of DUT, imaging conditions, number of involved images and methods for suppression of display matrix modulations
13 4.5.2 Conditions of measuring equipment
Figure 2 – Typical relative spectral response of a CCD detectorarray without IR-blocking filter (B/W camera) and a luminance meterwith a sensitivity according to CIE V()
14 4.5.3 Standard measurement locations
4.6 Test pattern
15 5 Measurement methods
5.1 Purpose
5.2 Equipment and conditions
5.3 Measurement procedure
Figure 3 – Measurement setup
16 5.4 Calculation
5.5 Report
17 Annex A (informative)Imaging and sampling conditions of sparkle pattern
A.1 Oversampling
18 A.2 Undersampling
Figure A.1 – Examples of sparkle image from the same DUTunder different measurement distances
19 Annex B (informative)Filtering methods for removing periodic modulations from the image
B.1 General
Table B.1 – Filtering method capabilities for removing artifactsrelated to display matrix elements
20 B.2 Filtering methods
B.2.1 Filtering in spatial domain
Figure B.1 – Display matrix element (grey square) in relation to the matrixof the imaging LMD detector elements (squares according to LMD pixel pitch)for the case of oversampling with an image sampling ratio of RS = 3,5
21 Figure B.2 – Examples of sparkle patterns at RS = 4,3 before applying an MWA filter (left) and after applying an MWA filter (right)
22 B.2.2 Filtering in frequency-domain
Figure B.3 – Electronic images of the DUT (i.e., display matrix elements with AGL, left) and frequency components of that image used as basis for sparkle evaluation
23 Annex C (informative)Hardware parameters that affect the sparkle contrast
C.1 LMD aperture setting
C.2 LMD focus
Figure C.1 – Example of the variation of the MTF of the imaging LMD under different F‑numbers as a function of spatial frequency of LMD pixels
24 C.3 Condition to avoid aliasing
25 Annex D (informative)Sparkle contrast measurement with display mock-up
D.1 Display mock-up
D.2 Measurement
Figure D.1 – Examples of display mock-ups
26 Figure D.2 – Example of measurement configuration
27 Annex E (informative)Calculation of sparkle contrast by the difference image method
E.1 Statistical background
E.2 Measurement procedure of the difference image method
28 E.3 Calculation of sparkle contrast by the difference image method
29 Annex F (informative)Calculation of sparkle contrast by the pixel power deviation method
F.1 Pixel power deviation description
F.2 Measurement procedure for the PPD method
31 Annex G (informative)Elimination of low-frequency radiance variation from the sparkle pattern
G.1 General
G.2 Normalization of the local average radiance of segmented sparkle pattern
Figure G.1 – Example of the segmentation of the measurement field for the preparation of the elimination of the low-frequency radiance variations from the sparkle pattern
32 G.3 Calculating the mean or median value of the segmented sparkle pattern
33 Bibliography

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BS IEC 62977-3-9:2023
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