ISO 9241 Part 3: Visual display requirements

Citation

ISO 9241-3:1992 Ergonomic requirements for office work with visual display terminals (VDTs) -- Part 3: Visual display requirements.

Status

International Standard. Wil be replaced by the ISO 9241-300 subseries.

Lifecycle Phase

Build the context of use.

Type of Guidance

Principles and general recommendations.

Application Area

  • Equipment
  • User testing

Scope

This part of ISO 9241 sets image quality requirements for the design and evaluation of monochrome and colour visual displays.  In the UK, the Health and Safety (Display Screen Equipment) Regulations 1992 require displays to be clear, legible and stable under normal working conditions. Displays that meet the requirements in this part of ISO 9241 are deemed by the Health and Safety Executive to satisfy this design requirement. The requirements in this part of ISO 9241 are stated as performance specifications and the standard provides test methods and conformance measurements. The specifications cover: design viewing distance; line-of-sight angle; angle of view; character height; stroke width; character width-to-height ratio; raster modulation and fill factor; character format; character size uniformity; between-character spacing; between-word spacing; between-line spacing; linearity; orthogonality; display luminance; luminance contrast; luminance balance; glare; image polarity; luminance uniformity; luminance coding; blink coding; temporal instability (flicker); spatial instability (jittter); and screen image colour. There are four annexes. The first provides analytical techniques for predicting screen flicker. The second describes an empirical method for assessing temporal and spatial instability (flicker and jitter) on screen. The third describes a comparative user performance test method: this annex has since been updated and re-issued as a separate document (ISO 9241-3:1992/Amd 1:2000). The final annex is a bibliography.

Audience

Manufacturers of visual displays (especially CRT displays) and people that need to evaluate the quality of visual displays. This is a technical standard that requires some knowledge of display design and human vision.

See Also

ISO 9241-3:1992/Amd 1:2000 Visual performance and comfort test.

ISO 13406-1:1999 Ergonomic requirements for work with visual displays based on flat panels -- Part 1: Introduction.

ISO 13406-2:2001 Ergonomic requirements for work with visual displays based on flat panels -- Part 2: Ergonomic requirements for flat panel displays.

Note: this page is a few editions behind the eBook and may be out-of-date. For the very latest on ISO 9241 get the eBook version of ISO 9241 for Beginners.


Web Usability: An Introduction to User Experience

Oct 22-23, London: Get hands on practice with user experience techniques like personas, card sorting, contextual inquiry and heuristic evaluation. More details

Download the best of Userfocus. For free.

100s of pages of practical advice on user experience, in handy portable form. 'Bright Ideas' eBooks.

Free newsletter

Over 7,000 people get our monthly newsletter. Sign up now and download your free guide to usability test moderation.

ISO 9241 for Beginners

Do you need a more up-to-date version of this guide? Do you need a version formatted for printing? Would you like a searchable version of this document on your own computer? Buy the ISO 9241 eBook.


Our services

Let us help you create great customer experiences.

Upcoming courses

We run regular training courses in usability and user experience.

Get free email updates

Join the thousands of other people who get their monthly fix of user experience insights from Userfocus and get a free guide to usability test moderation.