ISO 9241-303:2011

Overview

ISO 9241-303:2011 - Ergonomics of human-system interaction: Requirements for electronic visual displays defines generic image‑quality requirements and ergonomic guidelines for electronic visual displays. The standard provides technology‑independent performance specifications and recommendations to ensure effective, comfortable and accessible viewing for users with normal or adjusted‑to‑normal eyesight. It focuses on optimizing viewing conditions, minimizing visual artefacts and improving legibility, readability and overall image fidelity.

Key topics and technical requirements

ISO 9241-303 organizes requirements into clear technical areas (see contents for full structure). Major topics include:

• Viewing conditions
  • Design viewing distance and direction, gaze and head tilt considerations, and virtual-image displays.
• Luminance and lighting
  • Display luminance, ambient illuminance, luminance balance, glare control and adjustment.
• Special physical environments
  • Recommendations for vibration, weather exposure and extreme temperatures affecting display performance.
• Visual artefacts
  • Identification and mitigation of luminance/colour non‑uniformity, geometric distortions, flicker, jitter, moiré and unwanted reflections.
• Legibility and readability
  • Requirements for luminance contrast, image polarity, character height and spacing, and graphic object legibility.
• Legibility of coding and graphics
  • Guidelines for luminance, blink, colour and geometrical coding of information.
• Fidelity
  • Colour gamut, grey‑scale rendering, motion rendering, image formation time, spatial resolution and pixel density.
• Conformance
  • Framework for assessing and declaring compliance with the standard.

Annexes provide background on perception, virtual displays, accessibility references and links to other parts of the ISO 9241 series.

Practical applications and who uses it

ISO 9241-303 is applicable where display ergonomics and image quality influence usability, safety or comfort:

• Display manufacturers - to specify design objectives and performance benchmarks.
• Hardware and system integrators - to select or validate displays for medical devices, industrial control, avionics, automotive, kiosks and consumer electronics.
• UX/UI designers and human factors professionals - to ensure on‑screen text, graphics and coding meet legibility and accessibility goals.
• Test laboratories and compliance teams - to define test criteria and conformance claims (used alongside ISO 9241-305, -307 and -304).
• Procurement and facilities managers - to write ergonomic requirements for workplace displays and public information systems.

Related standards (within ISO 9241 series)

• ISO 9241-300 (Introduction to EVD requirements)
• ISO 9241-302 (Terminology for electronic visual displays)
• ISO 9241-304 / -305 / -307 (User performance tests, optical lab tests, analysis & compliance)

Keywords: ISO 9241-303, electronic visual displays, ergonomics, image-quality requirements, display luminance, legibility, visual artefacts, human-system interaction.