IEC 62906-5-6:2020

IEC 62906-5-6 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
colour
inside
Laser displays –
Part 5-6: Measuring methods for optical performance of projection screens
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IEC 62906-5-6 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
colour
inside
Laser displays –
Part 5-6: Measuring methods for optical performance of projection screens

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.260 ISBN 978-2-8322-8233-5

– 2 – IEC 62906-5-6:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 7
4 Standard measuring conditions . 7
4.1 General . 7
4.2 Environmental conditions . 7
4.3 Power supply . 7
4.4 Warm-up time . 7
4.5 Measurement coordinate system . 8
4.6 Darkroom conditions . 8
4.7 Measuring facilities . 8
5 Installation and adjustment of the DUT . 9
5.1 Placement of the projector and the screen . 9
5.2 Focusing of the projector . 9
5.3 Standard projector setup conditions . 10
5.4 Standard image measurement locations . 10
6 Signal patterns . 11
7 Measuring methods . 12
7.1 Screen gain . 12
7.1.1 Purpose . 12
7.1.2 Measuring equipment and conditions . 12
7.1.3 Measuring methods . 13
7.2 Screen gain directivity and half-gain angle . 13
7.2.1 Purpose . 13
7.2.2 Measuring conditions . 14
7.2.3 Measuring methods . 14
7.3 Screen gain uniformity . 14
7.3.1 Purpose . 14
7.3.2 Measuring conditions . 15
7.3.3 Measuring methods . 15
7.4 Angular characteristics of speckle contrast . 15
7.4.1 Purpose . 15
7.4.2 Measuring conditions . 15
7.4.3 Measuring methods . 16
Annex A (informative) Screen colour shift . 17
A.1 Purpose . 17
A.2 Measuring conditions . 17
A.3 Measuring methods . 17
Annex B (informative) Screen directivity using a Fresnel lens . 18
Annex C (informative) Angular characteristics of speckle contrast with different
screens . 20
Bibliography . 22

Figure 1 – Coordinate system for projection direction and viewing direction . 8
Figure 2 – Example of image pattern with horizontal size H and vertical size V used for
alignment . 10
Figure 3 – Standard measurement locations on the screen (nine measurement points) . 11
Figure 4 – Example of DUT setup . 11
Figure 5 – Full screen patterns . 11
Figure 6 – Measuring geometry of screen gain . 13
Figure 7 – Viewing direction measurement in both horizontal and vertical directions . 14
Figure 8 – Measuring geometry of speckle contrast with changing viewing direction . 16
Figure B.1 – Directivity of the screen under different setups . 18
Figure C.1 – Optical configuration for speckle contrast measurement with different

viewing directions . 20
Figure C.2 – Angular characteristics of speckle contrast obtained from different screen
and different de-speckle conditions . 20

– 4 – IEC 62906-5-6:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LASER DISPLAYS –
Part 5-6: Measuring methods for optical
performance of projection screens

FOREWORD
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International Standard IEC 62906-5-6 has been prepared by IEC technical committee 110:
Electronic displays.
The text of this International Standard is based on the following documents:
FDIS Report on voting
10/1187/FDIS 110/1198/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62906 series, published under the general title Laser displays, can
be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date
...