Overview
IEC 62977-2-7:2024 defines standardized measuring conditions and methods for determining the optical characteristics of tiled displays - systems made by assembling multiple display modules (tiles) to form a single, flat, direct‑view screen. The standard applies to both emissive and transmissive direct‑view flat displays that render real 2D images with all modules in the same plane, and is intended for controlled environments such as laboratory and production testing. Note: measurement results depend on the measurement method and the light measuring device (LMD) calibration and are not absolute product specifications.
Key Topics
- Standard measuring equipment
- Use of calibrated Light Measuring Devices (LMDs) and defined viewing‑direction coordinate systems for repeatable optical measurement.
- Measuring conditions
- Specified environmental conditions, darkroom setup, warm‑up times and standard set‑up for consistent test results.
- Alignment measurements
- Procedures for evaluating tile-to-tile alignment including seam width and depth, X–Y alignment, Z‑axis alignment and tilt.
- Visual uniformity
- Methods for quantifying luminance uniformity, chromaticity non‑uniformity, contrast‑ratio uniformity and reflectance non‑uniformity across the tiled screen.
- Viewing direction dependence
- Measurement of luminance and chromaticity changes as a function of viewing angle (inclination and azimuth) to assess performance across observer positions.
- Measurement locations and patterns
- Defined measurement grids and test patterns (e.g., full grey, grille patterns) to locate and evaluate non‑uniformities and seams.
Applications
IEC 62977-2-7 is practical for organizations involved in designing, assembling, testing and procuring tiled display systems:
- Display manufacturers and module integrators - for production QA, module-to-module validation and assembly verification.
- Test laboratories and calibration labs - to provide repeatable optical characterization and conformance testing.
- System integrators and AV contractors - to verify visual uniformity and alignment before installation.
- R&D teams - for comparative evaluations during product development and for assessing tiling technologies (overlap, invisible seams).
- Procurement and acceptance testing - to define measurable acceptance criteria during factory acceptance tests (FAT) and incoming inspection.
Keywords: IEC 62977-2-7, tiled displays, optical measurements, luminance uniformity, seam width, light measuring device, direct‑view flat displays, measurement methods, production testing
Related standards
This standard complements existing TC 110 methods and provides structured, repeatable procedures for evaluating the optical behavior of tiled display systems in controlled test environments.