Overview
IEC 62977-2-11:2023 - Electronic displays: Measurement of optical characteristics - Local luminance and uniformity - defines standardized methods for measuring local luminance and local luminance uniformity of emissive displays. The standard focuses on measurements performed with a light measuring device (LMD) whose measurement field covers more than 500 pixels of TVs, monitors or signage displays. It targets the detection and quantification of optical variations within a specified local block (an area with at least 500 regularly arranged emission pixels), rather than spatially integrated results across the entire panel.
Key topics and technical requirements
- Scope and definitions: Clear definitions of local block, local luminance, local luminance consistency (LLC), local contrast consistency (LCC) and local luminance uniformity (LLU).
- Standard setup conditions: Requirements for the light measuring device (LMD) and imaging LMD (iLMD), measurement distance, measurement-field angle, environmental conditions (including darkroom and power/warm‑up conditions) and measuring-direction setup.
- Test patterns: Prescribed reference and emissive-patterns, including a 4% white-box reference pattern and emissive ratio–variable patterns; arrangements of regularly scattered emission pixels are used to reveal local non-uniformities.
- Measurement methods: Procedures for assessing
- local luminance consistency (variation range within the local block),
- local contrast consistency,
- local luminance uniformity (variation among adjacent pixels).
Results are reported in standardized units and percentages (e.g., LLC, LCC, LLU) to support repeatable comparison.
- Measurement coverage and pixel-count rules: The LMD measurement field must include more than 500 pixels and guidance is given on how many pixels and how the test patterns should cover the measurement field.
- Reporting and examples: The standard includes guided measurement points, example result tables and illustrative figures to ensure consistent implementation.
Practical applications and users
IEC 62977-2-11:2023 is intended for professionals who evaluate emissive display optical performance:
- Display manufacturers (OLED, microLED, etc.) - for R&D, production verification and quality control.
- Test laboratories and certification bodies - for standardized, repeatable measurements and reporting.
- OEMs and procurement teams - to specify and verify local luminance and uniformity in supplier contracts.
- Signage and broadcast integrators - to assess local non‑uniformities that affect image quality in large displays.
Applying this standard helps identify pixel-to-pixel cluster deviations, improve manufacturing yield, and produce consistent user-facing image quality.
Related standards
- IEC 62341-1-2 (OLED displays - terminology and symbols)
- IEC 60050-845 (Electrotechnical vocabulary - lighting)
- CIE 70-1987 (Measurement of absolute luminous intensity distributions)
Keywords: IEC 62977-2-11:2023, local luminance, luminance uniformity, emissive displays, LMD, display testing, OLED, microLED, measurement standard.
Open preview (PDF)Electronic displays - Part 2-11: Measurement of optical characteristics - Local luminance and uniformity
