IEC 62977-3-9:2023
(Main)Electronic displays - Part 3-9: Evaluation of optical performance - Display sparkle contrast
Electronic displays - Part 3-9: Evaluation of optical performance - Display sparkle contrast
IEC 62977-3-9:2023 specifies standard measurement conditions and methods for determining the sparkle contrast of direct-view displays which comprise display matrix elements to render real 2D images on a flat panel and an anti-glare layer. This document excludes measurement of sparkle, which is intentionally obtained by the specular reflection from reflecting flakes in coatings and paints.
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IEC 62977-3-9 ®
Edition 1.0 2023-06
INTERNATIONAL
STANDARD
colour
inside
Electronic displays –
Part 3-9: Evaluation of optical performance – Display sparkle contrast
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IEC 62977-3-9 ®
Edition 1.0 2023-06
INTERNATIONAL
STANDARD
colour
inside
Electronic displays –
Part 3-9: Evaluation of optical performance – Display sparkle contrast
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120; 31.260 ISBN 978-2-8322-7063-9
– 2 – IEC 62977-3-9:2023 © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, abbreviated terms and letter symbols . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 7
3.3 Letter symbols . 7
4 Standard measurement conditions . 9
4.1 Environmental conditions . 9
4.2 Dark room conditions . 9
4.3 Warm-up time . 9
4.4 Measurement coordinate systems . 9
4.5 Standard conditions for the measuring equipment . 10
4.5.1 General . 10
4.5.2 Conditions of measuring equipment . 11
4.5.3 Standard measurement locations . 12
4.6 Test pattern . 12
5 Measurement methods . 13
5.1 Purpose . 13
5.2 Equipment and conditions . 13
5.3 Measurement procedure . 13
5.4 Calculation . 14
5.5 Report. 14
Annex A (informative) Imaging and sampling conditions of sparkle pattern . 15
A.1 Oversampling . 15
A.2 Undersampling . 16
Annex B (informative) Filtering methods for removing periodic modulations from the
image . 17
B.1 General . 17
B.2 Filtering methods . 18
B.2.1 Filtering in spatial domain . 18
B.2.2 Filtering in frequency-domain . 20
Annex C (informative) Hardware parameters that affect the sparkle contrast . 21
C.1 LMD aperture setting . 21
C.2 LMD focus . 21
C.3 Condition to avoid aliasing . 22
Annex D (informative) Sparkle contrast measurement with display mock-up . 23
D.1 Display mock-up . 23
D.2 Measurement . 23
Annex E (informative) Calculation of sparkle contrast by the difference image method . 25
E.1 Statistical background . 25
E.2 Measurement procedure of the difference image method . 25
E.3 Calculation of sparkle contrast by the difference image method . 26
Annex F (informative) Calculation of sparkle contrast by the pixel power deviation
method . 27
F.1 Pixel power deviation description . 27
F.2 Measurement procedure for the PPD method . 27
Annex G (informative) Elimination of low-frequency radiance variation from the sparkle
pattern . 29
G.1 General . 29
G.2 Normalization of the local average radiance of segmented sparkle pattern . 29
G.3 Calculating the mean or median value of the segmented sparkle pattern . 30
Bibliography . 31
Figure 1 – Cartesian coordinate system and spherical coordinate system for the
specification of the viewer's gazing (viewing) direction . 9
Figure 2 – Typical relative spectral response of a CCD detector array without IR-
blocking filter (B/W camera) and a luminance meter with a sensitivity according to
CIE V(λ) . 11
Figure 3 – Measurement setup . 13
Figure A.1 – Examples of sparkle image from the same DUT under different
measurement distances . 16
Figure B.1 – Display matrix element (grey square) in relation to the matrix of the
imaging LMD detector elements (squares according to LMD pixel pitch) for the case of
oversampling with an image sampling ratio of R = 3,5 . 18
S
Figure B.2 – Examples of sparkle patterns at R = 4,3 before applying an MWA filter
S
(left) and after applying an MWA filter (right) . 19
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 . 20
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 . 21
Figure D.1 – Examples of display mock-ups . 23
Figure D.2 – Example of measurement configuration . 24
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 . 29
Table 1 – Letter symbols (quantity symbols and units) . 7
Table 2 – Distinguishing types of DUT, imaging conditions, number of involved images
and methods for suppression of display matrix modulations . 10
Table B.1 – Filtering method capabilities for removing artifacts related to display matrix
elements . 17
– 4 – IEC 62977-3-9:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRONIC DISPLAYS –
Part 3-9: Evaluation of optical performance –
Display sparkle contrast
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