IEC 62679-3-3:2016(E) 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.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3.2 Abbreviated terms 4 Standard measuring conditions 4.1 Standard environmental measuring conditions 4.2 Viewing direction coordinate system <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 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 4.3.3 Standard indoor ambient illumination spectra Figures Figure 1 \u2013 Representation of the coordinate system used to specifythe viewing or measurement orientation <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.3.4 Standard illumination geometries <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.4 Adjustment of the EPD 4.5 Standard conditions of measuring equipment 4.6 Working standards and references 4.7 Standard locations of measurement field 4.7.1 Matrix displays <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 4.7.2 Segment displays 5 Optical measuring methods 5.1 Reflection measurements 5.1.1 General 5.1.2 Measuring conditions Figure 2 \u2013 Standard measurement positions <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.1.3 Measuring the hemispherical diffuse reflectance <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Tables Table 1 \u2013 Eigenvalues M1 and M2 for CIE daylight Illuminant D50 <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.1.4 Measuring the reflectance factor for a directed light source <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.2 Display photometric uniformity in a dark room 5.2.1 Purpose 5.2.2 Measuring equipment 5.2.3 Measurement method <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.2.4 Definitions and evaluations 5.3 Dark room contrast ratio 5.3.1 Purpose 5.3.2 Measuring equipment 5.3.3 Measurement method 5.3.4 Definitions and evaluations <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5.4 Contrast ratio under indoor illumination 5.4.1 Purpose 5.4.2 Measurement conditions 5.4.3 Measurement method <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 5.5 Cross-talk 5.5.1 Purpose 5.5.2 Measuring equipment 5.5.3 Greyscale matrix displays <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figure 3 \u2013 Window pattern for cross-talk measurement <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 5.5.4 Black and white (two-level) matrix displays <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 5.6 Display colour, colour gamut, and colour gamut area 5.6.1 Purpose 5.6.2 Measuring equipment 5.6.3 Measurement method 5.6.4 Display colour gamut Figure 4 \u2013 Example representation of the same primary colours in the CIE 1931 (left) and CIE 1976 (right) chromaticity diagrams <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 5.6.5 Display colour gamut area <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Table 2 \u2013 Input signals for CIELAB and CIE UCS u\u2019v\u2019 colour gamut area measurements <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 5.7 Display colorimetric uniformity in a dark room 5.7.1 Purpose 5.7.2 Measuring equipment 5.7.3 Measurement method Figure 5 \u2013 Example of evaluation results for the colour gamut area on the a*b* plane of the CIELAB colour space <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 5.7.4 Definitions and evaluations 5.8 Display colour under indoor illumination 5.8.1 Purpose 5.8.2 Measurement conditions Table 3 \u2013 Example data of in-plane colour non-uniformity <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 5.8.3 Measurement method 5.8.4 Definitions and evaluations <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 5.9 Colour gamut volume under indoor illumination 5.9.1 Purpose 5.9.2 Measurement conditions 5.9.3 Measurement method <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 5.9.4 Definitions and evaluations Figure 6 \u2013 An example of the range in colours produced by an sRGB display as represented by the CIELAB colour space Table 4 \u2013 Example of minimum colours required for gamut volume calculation of a 3-primary 8-bit display <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 5.9.5 Recording Table 5 \u2013 Measured tristimulus values for the minimum set of colours(see Table 4) required for gamut volume calculation under the specifiedindoor illumination conditions Table 6 \u2013 Calculated white point in the darkened roomand indoor ambient condition Table 7 \u2013 Colour gamut volume in the CIELAB colour space <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 5.10 Viewing direction dependence in a dark room 5.10.1 Purpose 5.10.2 Measuring conditions 5.10.3 Measuring method <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 5.10.4 Definitions and evaluations Figure 7 \uf02d Example of contrast ratio dependence on viewing direction <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Table 8 \u2013 Example format used for recording viewing direction performance <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 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 \u2013 Analysis flow chart for calculating the colour gamut volume <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Figure A.2 \u2013 Graphical representation of the colour gamut volume for sRGB in the CIELAB colour space Table A.1 \u2013 Tristimulus values of the sRGB primary colours Table A.2 \u2013 Example of sRGB colour set represented in the CIELAB colour space <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | A.3 Surface subdivision method for CIELAB gamut volume calculation Table A.3 \u2013 Example of an sRGB colour gamut volume in the CIELAB colour space <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Electronic paper displays – Optical measuring methods for displays with integrated lighting units<\/b><\/p>\n |