IEC 62906-1-2:2015

Laser display devices - Part 1-2: Vocabulary and letter symbols

IEC 62906-1-2:2015(E) gives the preferred terms, their definitions and symbols for laser display devices and relevant components with the object of using the same terminology when publications are prepared in different countries.

General Information

• Status: Published
• Publication Date: 15-Jul-2015
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 10 - TC 110/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 16-Jul-2015
• Completion Date: 31-Jul-2015

Overview

IEC 62906-1-2:2015 - "Laser display devices - Part 1-2: Vocabulary and letter symbols" is an IEC international standard that establishes preferred terms, definitions and letter symbols for laser display devices and related components. Its purpose is to harmonize terminology across publications and countries for consistent technical communication in the field of laser-based displays, projection systems and associated measurement reports.

Key topics

• Standardized vocabulary for laser display devices, including fundamental terms such as laser display device (LDD) and hybrid LDD.
• Speckle terminology and classification:
  • Definitions of speckle, monochromatic speckle, colour speckle, objective speckle, subjective speckle, projected speckle, screen speckle, and speckle grain size.
  • Introduction to speckle contrast ratio (SCR) (symbol C) and its role in describing speckle visibility.
  • Informative Annex A: categorization of objective vs. subjective speckle, and guidance including the minimum objective and subjective speckle grain size relationships (formulas relating wavelength λ and angular aperture θ).
• Display category terminology: raster-scanned projection, full-frame projection, line-scanned projection, front/rear projection, and retina direct projection.
• Optical and source terms: definitions for screens, spatial light modulators (LCOS, DMD), and light-source types (e.g., second harmonic generation laser).
• Letter symbols (quantity/unit symbols): a concise table of symbols used in the series (for example, C for speckle contrast ratio; s_obj, s_subj for minimum speckle grain sizes).

Applications and who uses it

This vocabulary standard is practical for:

• Manufacturers and designers of laser projectors, laser display modules, LCOS/DMD systems, and retinal displays to ensure consistent product specifications and datasheets.
• Test laboratories and QA teams that prepare measurement reports (especially on speckle and image artifacts).
• Standards writers, regulators and procurement teams who need harmonized terminology for regulations, standards references and procurement documents.
• Researchers and academics working on speckle mitigation, laser imaging and human visual perception of laser displays.

Practical uses include documentation consistency, clearer product requirements, unambiguous test methods referencing, and improved international interoperability of technical literature related to laser display devices.

Related standards

• Part of the IEC 62906 series (Laser display devices); consult other parts of IEC 62906 for system requirements, test methods or safety-related content. IEC technical committee: TC 110 (Electronic display devices).

Standards Content (Sample)

IEC 62906-1-2 ®
Edition 1.0 2015-07
INTERNATIONAL
STANDARD
colour
inside
Laser display devices –
Part 1-2: Vocabulary and letter symbols

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 62906-1-2 ®
Edition 1.0 2015-07
INTERNATIONAL
STANDARD
colour
inside
Laser display devices –
Part 1-2: Vocabulary and letter symbols

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.260 ISBN 978-2-8322-2779-4

– 2 – IEC 62906-1-2:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Terms, definitions, and abbreviations . 5
2.1 Classification of terms . 5
2.2 Fundamental terms . 5
2.3 Terms related to speckle . 5
2.4 Terms related to display category . 7
2.5 Terms related to optical devices . 7
2.6 Terms related to light sources . 8
3 Letter symbols (quantity symbols / unit symbols) . 8
Annex A (informative) Categorization of speckle and speckle contrast ratio . 9
A.1 Objective speckle . 9
A.2 Subjective speckle . 9
A.3 Speckle contrast ratio . 10
Bibliography . 12

Figure A.1 – Optical configuration to observe objective speckle . 9
Figure A.2 – Optical configuration to observe subjective speckle . 10
Figure A.3 – Classification map of speckle . 10

Table 1 – Letter symbols . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LASER DISPLAY DEVICES –
Part 1-2: Vocabulary and letter symbols

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard 62601-1-2 has been prepared by IEC technical committee 110:
Electronic display devices.
The text of this standard is based on the following documents:
FDIS Report on voting
110/661/FDIS 110/672/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication 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 display
devices, can be found on the IEC website.

– 4 – IEC 62906-1-2:2015 © IEC 2015
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
LASER DISPLAY DEVICES –
Part 1-2: Vocabulary and letter symbols

1 Scope
This part of IEC 62906 gives the preferred term
...