BS IEC 62679-3-3 Electronic paper displays -Part 3-3: Optical measuring methods for displays with integrated lighting units

Scope

This part of IEC 62679 specifies the standard measurement conditions and measurement methods for determining the optical performance of electronic paper display (EPD) devices which have an operating integrated lighting unit (such as a front light). The scope of this document is restricted to EPDs using segmented or matrix structures with either monochromatic or colour type displays. The measurement methods are intended for EPDs operated in a reflective mode with the integrated lighting unit (ILU) turned on in a dark or indoor ambient lighting environment. Colour systems beyond three primaries are not covered
in this document.

Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements for this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

IEC 62679-1-1, Electronic paper displays – Part 1-1: Terminology

IEC 62679-3-1:2014, Electronic paper displays – Part 3-1: Optical measuring methods

IEC 61966-2-1, Multimedia systems and equipment – Colour measurement and management
– Part 2-1: Colour management – Default RGB colour space – sRGB

CIE 15, Colorimetry

Optical measuring methods

Reflection measurements

General
The purpose of this method is to determine the reflectance factor of an EPD with an ILU on under defined illumination conditions. If it can be demonstrated that the reflection properties of the EPD are the same with the ILU off or on, then the reflection measurements may be performed with the ILU off.

Spectral reflectance factor measurements are generally preferred. Luminous reflectance factor measurements can be used to calculate photometric quantities (such as ambient contrast ratio), but only when the source illumination closely approximates the intended illuminant used in the analysis [4].

LISUN following instruments fully meet BS IEC 62679-3-3 Electronic paper displays -Part 3-3: Optical measuring methods for displays with integrated lighting units

XYL-VI Luminance Colorimeter

LS-ELF 2D Video Luminance Meter

LSG-1890BCCD High Precision Rotation Luminaire Goniospectroradiometer