BS IEC 62679-3-1:2014
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Electronic paper displays – Optical measuring methods
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 54 |
IEC 62679-3-1:2014 specifies the standard measurement conditions and measurement methods for determining the optical performance of Electronic Paper Display (EPDs). The scope of this document is restricted to EPDs using either segment, passive, or active matrix with either monochromatic or colour type displays. The measuring methods are intended for EPDs operated in a reflective mode. The EPDs may include an integrated lighting unit (ILU), but the ILU will be turned off for these measuring methods. Colour systems beyond three primaries are not covered in this document.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | English CONTENTS |
| 7 | FOREWORD |
| 9 | 1 Scope 2 Normative references 3 Terms, definitions and abbreviations 3.1 Terms and definitions |
| 10 | 3.2 Abbreviations 4 Standard measuring conditions 4.1 Standard measuring environmental conditions 4.2 Viewing direction coordinate system |
| 11 | 4.3 Standard lighting conditions 4.3.1 General comments and remarks on the measurement of electronic paper displays 4.3.2 Dark-room conditions Figures Figure 1 – Representation of the viewing direction, or direction of measurement, defined by the angle of inclination, and the angle of rotation (azimuth angle) in a polar coordinate system |
| 12 | 4.3.3 Standard ambient illumination spectra |
| 13 | 4.3.4 Standard illumination geometries |
| 14 | Figure 2 – Illustrated examples for directional illumination Figure 3 – Example of the measuring setup using directional illumination where θS = 40° and θR = 30° |
| 15 | Figure 4 – Example of the ring light illumination measuring setup where θS± Δ = 35°± 5° and θR = 20° |
| 16 | Figure 5 – Detailed schematic of ring light characteristics |
| 17 | Figure 6 – Example of measurement geometries for hemispherical illuminationusing an integrating sphere (left) and sampling sphere (right) |
| 18 | 4.4 Standard conditions of measuring equipment 4.4.1 General 4.4.2 Adjustment of EPD 4.4.3 Conditions of measuring equipment |
| 19 | 4.4.4 Contact measurements with integrated illumination/detection instruments Figure 7 – Layout diagram of measurement setup |
| 20 | 4.5 Working standards and references 4.5.1 Diffuse reflectance standard 4.5.2 Specular reflectance standard |
| 21 | 4.6 Standard locations of measurement field 4.6.1 Matrix displays 4.6.2 Segment displays Figure 8 – Standard measurement positions |
| 22 | 5 Optical measuring methods 5.1 Reflection measurements 5.1.1 Purpose 5.1.2 Measuring conditions 5.1.3 Measuring the hemispherical diffuse spectral reflectance factor |
| 23 | Tables Table 1 – Eigenvalues M1 and M2 for CIE daylight Illuminants D50 and D75 |
| 24 | 5.1.4 Measuring the reflectance factor for a directed light source |
| 25 | 5.2 Display photometric in-plane uniformity 5.2.1 Purpose 5.2.2 Measuring equipment 5.2.3 Measurement method |
| 26 | 5.2.4 Definitions and evaluations 5.3 Contrast ratio 5.3.1 Purpose 5.3.2 Measuring equipment 5.3.3 Measurement method |
| 27 | 5.3.4 Definitions and evaluations 5.4 Ambient contrast ratio 5.4.1 Purpose 5.4.2 Measuring conditions 5.4.3 Measuring method |
| 28 | 5.5 Cross-talk 5.5.1 Purpose 5.5.2 Measuring equipment 5.5.3 Greyscale matrix displays |
| 29 | Figure 9 – Window pattern for cross-talk measurement |
| 30 | 5.5.4 Black and white (two-level) matrix displays 5.6 Display colour, colour gamut, and colour gamut area 5.6.1 Purpose 5.6.2 Measuring equipment |
| 31 | 5.6.3 Measurement method 5.6.4 Definitions and evaluations |
| 32 | 5.6.5 Display colour gamut 5.6.6 Display colour gamut area Figure 10 – Example of display colour gamut |
| 33 | Table 2 – Input signals for CIELAB and CIE UCS u’v’ colour gamut area measurements |
| 34 | 5.7 Display colorimetric in-plane uniformity 5.7.1 Purpose 5.7.2 Measuring equipment 5.7.3 Measurement method Figure 11 – Example of evaluation results for the colour gamut area on the a*b* plane of the CIELAB colour space |
| 35 | 5.7.4 Definitions and evaluations Table 3 – Example data of in-plane colour non-uniformity |
| 36 | 5.8 Daylight display colour 5.8.1 Purpose 5.8.2 Measuring conditions 5.8.3 Measuring method |
| 37 | 5.9 Daylight colour gamut volume 5.9.1 Purpose 5.9.2 Measuring conditions 5.9.3 Measuring method Table 4 – Example of minimum colours required for gamut volume calculation of a 3-primary 8-bit display |
| 38 | Figure 12 – An example of range in colours produced by a given display as represented by the CIELAB colour space |
| 39 | 5.9.4 Reporting 5.10 Viewing direction dependence 5.10.1 Purpose 5.10.2 Measuring conditions Table 5 – Measured tristimulus values for the minimum set of colours (see Table 4) required for gamut volume calculation under the specified daylight illumination conditions Table 6 – Colour gamut volume in the CIELAB colour space |
| 40 | 5.10.3 Measuring method Figure 13 – Illumination/detection geometry for measuring the viewing direction properties of the display |
| 41 | 5.10.4 Definitions and evaluations |
| 42 | Figure 14 – Example of contrast ratio dependence on viewing direction |
| 43 | 5.11 Ghosting 5.11.1 Purpose 5.11.2 Measuring equipment 5.11.3 Measuring method Table 7 – Example format used for reporting viewing direction performance |
| 44 | 5.11.4 Definitions and evaluations Figure 15 – Display pattern used to characterize ghosting. |
| 45 | Annex A (informative) Calculation method of daylight colour gamut volume A.1 Purpose A.2 Procedure for calculating the colour gamut volume Figure A.1 – Analysis flow chart for calculating the colour gamut volume |
| 46 | Figure A.2 – Graphical representation of the colour gamut volume for sRGB in the CIELAB colour space Table A.1 – Tristimulus values of the sRGB primary colours Table A.2 – Example of sRGB colour set represented in the CIELAB colour space |
| 47 | A.3 Surface subdivision method for CIELAB gamut volume calculation A.3.1 Purpose A.3.2 Assumptions A.3.3 Algorithm A.3.4 Software example Table A.3 – Example of sRGB colour gamut volume in the CIELAB colour space |
| 52 | Bibliography |
