Overview
ISO/TR 9241-311:2022 is a Technical Report in the ISO 9241 series on ergonomics of human‑system interaction. It provides application guidance for specifying liquid crystal display (LCD) screens used at visual display workstations in indoor locations, in accordance with ISO 9241-307:2008, 5.2. The report is limited to LCD technology (the most common workstation display type) and is intended to support managerial decision‑makers responsible for acquisition of displays.
Key topics and technical coverage
This TR summarizes terminology, classification and selection guidance rather than introducing new mandatory test methods. Key technical topics include:
- Terms and definitions commonly used in display ergonomics - e.g. luminance contrast, luminance balance, image polarity, colour non‑uniformity, contrast non‑uniformity, visual artefacts, pixel density, fill factor, spatial resolution, grey scale, and image formation time.
- Guidance on classification, profiles and screen selection (profiles No. 1–4 are defined to support different contexts of use and procurement decisions).
- Considerations for ambient lighting and reflections - the scope acknowledges illuminance ranges considered in ISO 9241-307 (typical indoor range cited: 50 lx to 1 500 lx).
- Usability and legibility metrics such as object size (visual angle), contrast for object legibility, colour considerations for graphics (examples in the TR reference minimum visual angles and colour‑set recommendations for office tasks).
- Identification of visual artefacts (e.g. Moiré) and other display defects relevant to workplace comfort and task performance.
Practical applications and users
ISO/TR 9241-311:2022 is aimed at professionals involved in procurement and workplace safety who need ergonomically sound display specifications:
- Procurement officers and IT buyers selecting LCD monitors for offices or control rooms.
- Occupational safety and health professionals and safety committees assessing visual ergonomics.
- Facility managers and designers who set viewing distances, lighting and workstation layout.
- Vendors and product managers preparing product datasheets that address ergonomic performance.
Use cases include preparing supplier specifications, comparing display models for legibility and comfort, and informing workplace risk assessments related to visual tasks.
Related standards
- ISO 9241-307:2008 - Analysis and compliance test methods for electronic visual displays (primary normative reference)
- ISO 9241-303, -305 - Requirements and optical laboratory test methods
- ISO 9241-302 - Terminology for electronic visual displays
- ISO 9241-300 series - broader context for electronic visual display requirements
Keywords: ISO/TR 9241-311:2022, ISO 9241-307, ergonomics of human‑system interaction, LCD screens, visual display workstations, display specification, procurement, luminance, colour gamut, pixel density, contrast, conformity assessment.
Open preview (PDF)Ergonomics of human-system interaction — Part 311: Application of ISO 9241-307: LCD screens for workstations