SIST EN ISO 9241-303:2012

SLOVENSKI STANDARD
SIST EN ISO 9241-303:2012
01-marec-2012
1DGRPHãþD
SIST EN ISO 9241-303:2009
(UJRQRPLMDPHGVHERMQHJDYSOLYDþORYHNVLVWHPGHO=DKWHYH]DHOHNWURQVNH
VOLNRYQH]DVORQH,62
Ergonomics of human-system interaction - Part 303: Requirements for electronic visual
displays (ISO 9241-303:2011)
Ergonomie der Mensch-System-Interaktion - Teil 303: Anforderungen an elektronische
optische Anzeigen (ISO 9241-303:2011)
Ergonomie de l'interaction homme-système - Partie 303: Exigences relatives aux écrans
de visualisation électroniques (ISO 9241-303:2011)
Ta slovenski standard je istoveten z: EN ISO 9241-303:2011
ICS:
13.180 Ergonomija Ergonomics
35.180 Terminalska in druga IT Terminal and other
periferna oprema IT peripheral equipment
SIST EN ISO 9241-303:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9241-303:2012

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SIST EN ISO 9241-303:2012


EUROPEAN STANDARD
EN ISO 9241-303

NORME EUROPÉENNE

EUROPÄISCHE NORM
November 2011
ICS 13.180; 35.180 Supersedes EN ISO 9241-303:2008
English Version
Ergonomics of human-system interaction - Part 303:
Requirements for electronic visual displays (ISO 9241-303:2011)
Ergonomie de l'interaction homme-système - Partie 303: Ergonomie der Mensch-System-Interaktion - Teil 303:
Exigences relatives aux écrans de visualisation Anforderungen an elektronische optische Anzeigen (ISO
électroniques (ISO 9241-303:2011) 9241-303:2011)
This European Standard was approved by CEN on 10 November 2011.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9241-303:2011: E
worldwide for CEN national Members.

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SIST EN ISO 9241-303:2012
EN ISO 9241-303:2011 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 9241-303:2012
EN ISO 9241-303:2011 (E)
Foreword
This document (EN ISO 9241-303:2011) has been prepared by Technical Committee ISO/TC 159
"Ergonomics" in collaboration with Technical Committee CEN/TC 122 “Ergonomics” the secretariat of which is
held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by May 2012, and conflicting national standards shall be withdrawn at the
latest by May 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 9241-303:2008.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 9241-303:2011 has been approved by CEN as a EN ISO 9241-303:2011 without any
modification.

3

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SIST EN ISO 9241-303:2012

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SIST EN ISO 9241-303:2012

INTERNATIONAL ISO
STANDARD 9241-303
Second edition
2011-11-15

Ergonomics of human-system
interaction —
Part 303:
Requirements for electronic visual
displays
Ergonomie de l'interaction homme-système —
Partie 303: Exigences relatives aux écrans de visualisation
électroniques




Reference number
ISO 9241-303:2011(E)
©
ISO 2011

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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO 2011
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 ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2011 – All rights reserved

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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)
Contents Page
Foreword . v
Introduction . viii
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Guiding principles . 1
5  Ergonomic requirements and recommendations . 2
5.1  Viewing conditions . 2
5.1.1  General . 2
5.1.2  Design viewing distance . 2
5.1.3  Design viewing direction . 3
5.1.4  Gaze and head tilt angles . 4
5.1.5  Displays for virtual images . 4
5.2  Luminance . 4
5.2.1  General . 4
5.2.2  Illuminance . 4
5.2.3  Display luminance . 4
5.2.4  Luminance balance and glare . 5
5.2.5  Luminance adjustment . 5
5.3  Special physical environments . 5
5.3.1  General . 5
5.3.2  Vibration . 5
5.3.3  Wind and rain . 6
5.3.4  Excessive temperatures . 6
5.4  Visual artefacts . 6
5.4.1  General . 6
5.4.2  Luminance non-uniformity . 6
5.4.3  Colour non-uniformity . 6
5.4.4  Contrast uniformity . 7
5.4.5  Geometric distortions . 8
5.4.6  Screen and faceplate defects . 8
5.4.7  Temporal instability (flicker) . 8
5.4.8  Spatial instability (jitter) . 9
5.4.9  Moiré effects . 9
5.4.10  Other instabilities . 10
5.4.11  Unwanted reflections . 10
5.4.12  Unintended depths effects . 10
5.5  Legibility and readability . 11
5.5.1  General . 11
5.5.2  Luminance contrast . 11
5.5.3  Image polarity . 11
5.5.4  Character height . 11
5.5.5  Text size constancy . 12
5.5.6  Character stroke width . 13
5.5.7  Character width-to-height ratio . 13
5.5.8  Character format . 13
5.5.9  Between-character spacing . 13
5.5.10  Between-word spacing . 13
5.5.11  Between-line spacing . 13
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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)
5.6  Legibility of information coding .14
5.6.1  General .14
5.6.2  Luminance coding .14
5.6.3  Blink coding .14
5.6.4  Colour coding .14
5.6.5  Geometrical coding .14
5.7  Legibility of graphics .14
5.7.1  General .14
5.7.2  Monochrome and multicolour object size .14
5.7.3  Contrast for object legibility .15
5.7.4  Colour considerations for graphics .15
5.7.5  Background and surrounding image effects .16
5.7.6  Number of colours .16
5.8  Fidelity .17
5.8.1  General .17
5.8.2  Colour gamut and reference white .17
5.8.3  Gamma and grey scale .17
5.8.4  Rendering of moving images .18
5.8.5  Image formation time (IFT) .19
5.8.6  Spatial resolution .19
5.8.7  Raster modulation or fill factor .19
5.8.8  Pixel density .20
6  Conformance .20
Annex A (informative) Overview of the ISO 9241 series .21
Annex B (informative) Attractivity, or subject visual quality .22
Annex C (informative) Usability aspects of installation .23
Annex D (normative) Basic concepts of visual perception for contrast and luminance of
electronic displays .25
Annex E (informative) Virtual display — Performance objectives .33
Annex F (informative) Electronic visual display accessibility — Selected bibliography .40
Bibliography .42

iv © ISO 2011 – All rights reserved

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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9241-303 was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee SC 4,
Ergonomics of human-system interaction.
This second edition cancels and replaces the first edition (ISO 9241-303:2008), of which it constitutes a minor
revision. Together with ISO 9241-302 and ISO 9241-305, ISO 9241-303:2008 cancelled and replaced
ISO 9241-8, and together with ISO 9241-302, ISO 9241-305 and ISO 9241-307, it cancelled and replaced
ISO 9241-7 and ISO 13406-2, and partially replaced ISO 9241-3:
 terms and definitions related to electronic visual displays were transferred to, and collected in,
ISO 9241-302;
 while the areas previously covered in ISO 9241 and by ISO 13406 remained essentially unchanged, test
methods and requirements were updated to account for advances in science and technology;
 all generic ergonomic requirements were incorporated into ISO 9241-303;
 the application of those requirements to different display technologies, application areas and
environmental conditions — including test methods and pass/fail criteria — is specified in ISO 9241-307.
ISO 9241 consists of the following parts, under the general title Ergonomic requirements for office work with
visual display terminals (VDTs):
 Part 1: General introduction
 Part 2: Guidance on task requirements
 Part 4: Keyboard requirements
 Part 5: Workstation layout and postural requirements
 Part 6: Guidance on the work environment
 Part 9: Requirements for non-keyboard input devices
 Part 11: Guidance on usability
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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)
 Part 12: Presentation of information
 Part 13: User guidance
 Part 14: Menu dialogues
 Part 15: Command dialogues
 Part 16: Direct manipulation dialogues
 Part 17: Form filling dialogues
ISO 9241 also consists of the following parts, under the general title Ergonomics of human-system interaction:
 Part 20: Accessibility guidelines for information/communication technology (ICT) equipment and services
 Part 100: Introduction to standards related to software ergonomics [Technical Report]
 Part 110: Dialogue principles
 Part 129: Guidance on software individualization
 Part 143: Forms
 Part 151: Guidance on World Wide Web user interfaces
 Part 171: Guidance on software accessibility
 Part 210: Human-centred design for interactive systems
 Part 300: Introduction to electronic visual display requirements
 Part 302: Terminology for electronic visual displays
 Part 303: Requirements for electronic visual displays
 Part 304: User performance test methods for electronic visual displays
 Part 305: Optical laboratory test methods for electronic visual displays
 Part 306: Field assessment methods for electronic visual displays
 Part 307: Analysis and compliance test methods for electronic visual displays
 Part 308: Surface-conduction electron-emitter displays (SED) [Technical Report]
 Part 309: Organic light-emitting diode (OLED) displays [Technical Report]
 Part 310: Visibility, aesthetics and ergonomics of pixel defects [Technical Report]
 Part 400: Principles and requirements for physical input devices
 Part 410: Design criteria for physical input devices
 Part 411: Evaluation methods for the design of physical input devices [Technical Specifiction]
 Part 420: Selection of physical input devices
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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)
 Part 910: Framework for tactile and haptic interaction
 Part 920: Guidance on tactile and haptic interactions
The following parts are under preparation:
 Part 154: Interactive voice response (IVR) applications
Human-centred design and evaluation methods, optical characteristics of autostereoscopic displays, and
requirements, analysis and compliance test methods for the reduction of photosensitive seizures are to form
the subjects of future parts 230, 331 and 391.
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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)
Introduction
This part of ISO 9241 addresses a large range of technologies, tasks and environments.
ISO 9241 was originally developed as a seventeen-part International Standard on the ergonomics
requirements for office work with visual display terminals. As part of the standards review process, a major
restructuring of ISO 9241 was agreed to broaden its scope, to incorporate other relevant standards and to
make it more usable. The general title of the revised ISO 9241, “Ergonomics of human-system interaction”,
reflects these changes and aligns the standard with the overall title and scope of Technical Committee
ISO/TC 159, Subcommittee SC 4. The revised multipart standard is structured as series of standards
numbered in the “hundreds”: the 100 series deals with software interfaces, the 200 series with human-centred
design, the 300 series with visual displays, the 400 series with physical input devices, and so on.
See Annex A for an overview of the entire ISO 9241 series.

viii © ISO 2011 – All rights reserved

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SIST EN ISO 9241-303:2012
INTERNATIONAL STANDARD ISO 9241-303:2011(E)

Ergonomics of human-system interaction —
Part 303:
Requirements for electronic visual displays
1 Scope
This part of ISO 9241 establishes image-quality requirements, as well as providing guidelines, for electronic
visual displays. These are given in the form of generic — independent of technology, task and environment —
performance specifications and recommendations that will ensure effective and comfortable viewing
conditions for users with normal or adjusted-to-normal eyesight.
This part of ISO 9241 does not address issues of accessibility for people with disabilities. However, it does
take into account aspects of the eyesight of older people and could be of value to people dealing with issues
of visual impairment in certain cases: the specification of essential characteristics for normal viewing can be
used to gauge the severity of different visual abnormalities so that appropriate solutions can be identified.
NOTE In addition to the Bibliography, Annex F gives a selected bibliography of documents addressing the needs of
people with disabilities, including people with poor, deteriorating or no eyesight.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 9241-302, Ergonomics of human-system interaction — Part 302: Terminology for electronic visual
displays
ISO 9241-307, Ergonomics of human-system interaction — Part 307: Analysis and compliance test methods
for electronic visual displays
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 9241-302 apply.
4 Guiding principles
For a satisfying human–display interaction, a number of different requirements have to be met at the same
time in an appropriate balance. For the purposes of this part of ISO 9241, these requirements have been
grouped into the following eight major areas:
 viewing conditions;
 luminance;
 special physical environments;
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SIST EN ISO 9241-303:2012
ISO 9241-303:2011(E)
 visual artefacts;
 legibility and readability;
 legibility of information coding;
 legibility of graphics;
 fidelity.
NOTE For the attractivity of the image on the visual display, see Annex B.
5 Ergonomic requirements and recommendations
5.1 Viewing conditions
5.1.1 General
Many tasks require that the information presented on an electronic visual display be acted upon. Viewing the
display such that this information can be taken up quickly, without error and with little effort, is thus highly
important. A number of viewing conditions that are necessary, though not sufficient of themselves, can be
specified for achieving fast, error-free and near-effortless viewing. These pertain to the design viewing
distance and direction and to the needed gaze and head tilt angles of the viewer.
It is known that viewing distance and line-of-sight angle (gaze angle) need to be compatible with the user's
vergence and accommodation capability and his or her capability to focus on short distances.
5.1.2 Design viewing distance
The design viewing distance is dependent on the task and on the electronic visual display and shall not be
less than 300 mm, being the typical minimum comfortable viewing distance, or near point, for normal
(emmetropic) eyes of adults. There is a physiologically determined relationship between the near point and
the age of the user, shown in Figure 1, and between the near point and the luminance level; however, there is
a large variance in this relation.
Shorter viewing distances, of between 200 mm and 300 mm, can be observed in children and (very) young
adults, enabling them to see details (e.g. parts of characters) smaller than those that they could see at greater
distances, provided that aspects such as display luminance, contrast and the sharpness are high enough.
However, most adults as well as older people position their displays at a larger viewing distance, typically
300 mm and more.
For larger visual displays, such as those used in office tasks, the preferred viewing distance is longer —
typically 400 mm to 750 mm. At this distance, the accommodative strain to the eyes is less than at shorter
viewing distances; moreover, there is larger freedom of movement at larger viewing distances. For
presentation tasks or projection, the preferred viewi
...