IEC 62679-3-3:2016
(Main)Electronic paper displays - Part 3-3: Optical measuring methods for displays with integrated lighting units
Electronic paper displays - Part 3-3: Optical measuring methods for displays with integrated lighting units
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.
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Standards Content (Sample)
IEC 62679-3-3 ®
Edition 1.0 2016-09
INTERNATIONAL
STANDARD
colour
inside
Electronic paper displays –
Part 3-3: Optical measuring methods for displays with integrated lighting units
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IEC 62679-3-3 ®
Edition 1.0 2016-09
INTERNATIONAL
STANDARD
colour
inside
Electronic paper displays –
Part 3-3: Optical measuring methods for displays with integrated lighting units
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120; 31.260 ISBN 978-2-8322-3616-1
– 2 – IEC 62679-3-3:2016 © IEC 2016
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references. 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 8
4 Standard measuring conditions . 8
4.1 Standard environmental measuring conditions . 8
4.2 Viewing direction coordinate system . 8
4.3 Standard lighting conditions . 9
4.3.1 General comments and remarks on the measurement of electronic
paper displays . 9
4.3.2 Dark room conditions . 9
4.3.3 Standard indoor ambient illumination spectra . 9
4.3.4 Standard illumination geometries . 10
4.4 Adjustment of the EPD . 11
4.5 Standard conditions of measuring equipment . 11
4.6 Working standards and references . 11
4.7 Standard locations of measurement field . 11
4.7.1 Matrix displays . 11
4.7.2 Segment displays . 12
5 Optical measuring methods . 12
5.1 Reflection measurements . 12
5.1.1 General . 12
5.1.2 Measuring conditions . 12
5.1.3 Measuring the hemispherical diffuse reflectance . 13
5.1.4 Measuring the reflectance factor for a directed light source . 15
5.2 Display photometric uniformity in a dark room . 16
5.2.1 Purpose . 16
5.2.2 Measuring equipment . 16
5.2.3 Measurement method . 16
5.2.4 Definitions and evaluations. 17
5.3 Dark room contrast ratio . 17
5.3.1 Purpose . 17
5.3.2 Measuring equipment . 17
5.3.3 Measurement method . 17
5.3.4 Definitions and evaluations. 17
5.4 Contrast ratio under indoor illumination . 18
5.4.1 Purpose . 18
5.4.2 Measurement conditions . 18
5.4.3 Measurement method . 18
5.5 Cross-talk . 19
5.5.1 Purpose . 19
5.5.2 Measuring equipment . 19
5.5.3 Greyscale matrix displays. 19
5.5.4 Black and white (two-level) matrix displays . 21
5.6 Display colour, colour gamut, and colour gamut area . 22
5.6.1 Purpose . 22
5.6.2 Measuring equipment . 22
5.6.3 Measurement method . 22
5.6.4 Display colour gamut . 22
5.6.5 Display colour gamut area . 23
5.7 Display colorimetric uniformity in a dark room . 25
5.7.1 Purpose . 25
5.7.2 Measuring equipment . 25
5.7.3 Measurement method . 25
5.7.4 Definitions and evaluations. 26
5.8 Display colour under indoor illumination . 26
5.8.1 Purpose . 26
5.8.2 Measurement conditions . 26
5.8.3 Measurement method . 27
5.8.4 Definitions and evaluations. 27
5.9 Colour gamut volume under indoor illumination . 28
5.9.1 Purpose . 28
5.9.2 Measurement conditions . 28
5.9.3 Measurement method . 28
5.9.4 Definitions and evaluations. 29
5.9.5 Recording . 30
5.10 Viewing direction dependence in a dark room . 30
5.10.1 Purpose . 30
5.10.2 Measuring conditions . 31
5.10.3 Measuring method . 31
5.10.4 Definitions and evaluations. 31
Annex A (informative) Calculation method of daylight colour gamut volume . 34
A.1 Purpose . 34
A.2 Procedure for calculating the colour gamut volume . 34
A.3 Surface subdivision method for CIELAB gamut volume calculation . 36
A.3.1 Purpose . 36
A.3.2 Assumptions . 36
A.3.3 Algorithm . 36
A.3.4 Software example . 36
Bibliography . 41
Figure 1 – Representation of the coordinate system used to specify the viewing or
measurement orientation . 9
Figure 2 – Standard measurement positions . 12
Figure 3 – Window pattern for cross-talk measurement . 20
Figure 4 – Example representation of the same primary colours in the CIE 1931 (left)
and CIE 1976 (right) chromaticity diagrams . 22
Figure 5 – Example of evaluation results for the colour gamut area on the a*b* plane
of the CIELAB colour space . 25
Figure 6 – An example of the range in colours produced by an sRGB display as
represented by the CIELAB colour space . 29
Figure 7 - Example of contrast ratio dependence on viewing direction . 32
– 4 – IEC 62679-3-3:2016 © IEC 2016
Figure A.1 – Analysis flow chart for calculating the colour gamut volume . 34
Figure A.2 – Graphical representation of the colour gamut volume for sRGB in the
CIELAB colour space . 35
Table 1 – Eigenvalues M and M for CIE daylight Illuminant D50 . 14
1 2
Table 2 – Input
...
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