Overview
IEC TR 62977-1-31:2021 (Edition 1.1, 2022‑03) is an IEC Technical Report that gives practical guidance on the use of light measuring devices (LMDs) - specifically luminance meters, colorimeters and spectroradiometers - equipped with luminance measuring optics for the characterization and testing of electronic displays. It is a consolidated document (2021 + Amendment 1:2022) providing application‑focused information rather than prescriptive limits, aimed at improving measurement reliability in display photometry and colorimetry.
Key topics and technical coverage
The report explains how LMD properties and setup affect measured display parameters. Major technical topics include:
- General guidance on photometry and colorimetry for displays, definitions and measurement principles.
- LMD configurations and input optics, including telecentric vs non‑telecentric designs and measurement field considerations.
- Calibration, maintenance and electronic system behavior of luminance meters, colorimeters and spectroradiometers.
- Spectral responsivity and spectral properties: wavelength accuracy, spectral bandwidth, spectral stray light and their effect on luminance and chromaticity.
- Angular response and subtended angle: influence of input optics on measurements and recommended measurement fields.
- Measurement performance characteristics: repeatability, accuracy, linearity and luminance range.
- Temporal aspects: synchronization between DUT (device under test) and LMD, response time, flicker measurement and low‑pass filtering.
- Impact of LMD properties on display metrics: contrast ratio, electro‑optical transfer function (EOTF), chromaticity gamut area, viewing‑direction characteristics, spatial uniformity and non‑uniformity.
- Practical methods to reduce measurement differences (e.g., matrix calibration for colorimeters) and informative annexes on photometry, input data and DUT instabilities.
Practical applications and users
This Technical Report is useful for:
- Display engineers and manufacturers designing or verifying LCD, OLED and microLED panels.
- Test and calibration laboratories establishing procedures for luminance, color and uniformity measurements.
- Quality assurance and R&D teams measuring contrast, EOTF, response time, flicker and viewing‑angle behavior.
- Instrument manufacturers and metrologists optimizing LMD design, calibration and measurement uncertainty.
- Standards writers and procurement officers who need consistent metrology practices for display specifications.
Practical outputs include improved measurement repeatability, reduced chromaticity errors, correct selection of measurement field/subtended angle, and guidance on temporal synchronization to capture dynamic display behavior.
Related standards (context)
IEC TR 62977-1-31 sits within the IEC display standards landscape and complements other parts of the IEC 62977 series and international photometry/colorimetry references. Consult the IEC webstore for the latest consolidated editions and related parts.