BS IEC 62715-5-1:2017
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Flexible display devices – Measuring methods of optical performance
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 58 |
IEC 62715-5-1:2017(E) specifies the standard measuring conditions and measuring methods for determining the optical performance of flexible displays in the dark or under ambient illumination. This document mainly applies to display modules that are bendable about one axis. The display is measured in a static mechanical state. The measuring methods apply to monochrome or colour displays with a single radius of curvature of 35 mm or greater.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | CONTENTS |
| 9 | FOREWORD |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions |
| 13 | 3.2 Abbreviated terms 4 Structure of measuring equipment 4.1 Measuring configuration – Display mounting 4.1.1 General |
| 14 | 4.1.2 Display mounting for uniformity measurements 4.1.3 Display mounting for viewing direction measurements Figures Figure 1 – Example of the coordinate system used for a convex display of a constant radius of curvature about the y-axis Figure 2 – Top view example of how a convex display can be rotated within the measurement field |
| 15 | 4.2 Light measuring device Figure 3 – Top view example of display mount that rotates in the x-z plane for viewing direction measurements |
| 16 | Figure 4 – Optical characteristics of a spot photometer, colorimeter, or spectroradiometer |
| 17 | 4.3 Light source configurations 4.3.1 General 4.3.2 Uniform hemispherical diffuse illumination Figure 5 – Example of the relationship between measurement field diameter and inclinations angles |
| 18 | 4.3.3 Directed source illumination Figure 6 – Example of reflection measurement geometries for spherical illumination Figure 7 – Example of convex display illuminated by a directed light source |
| 19 | 5 Standard measuring conditions 5.1 Standard measuring environmental conditions 5.2 Standard lighting conditions 5.2.1 Dark room conditions 5.2.2 Standard ambient illumination spectra Figure 8 – Example of convex display illuminated by a ring light source |
| 21 | 5.2.3 Standard illumination geometries 5.2.4 Diffuse reflectance standard 5.3 Standard setup conditions 5.3.1 Adjustment of display modules 5.3.2 Starting conditions of measurements |
| 22 | 5.3.3 Conditions of measuring equipment 5.4 Standard locations of measurement field 6 Optical measuring methods in dark room conditions 6.1 Luminance and its uniformity 6.1.1 General Figure 9 – Standard measurement positions |
| 23 | 6.1.2 Measuring equipment 6.1.3 Screen centre luminance measuring method 6.1.4 Luminance uniformity measuring method Figure 10 – Test pattern used for 4 % area window measurements |
| 24 | 6.1.5 Luminance uniformity definition and evaluation 6.2 Contrast ratio 6.2.1 General 6.2.2 Measuring equipment 6.2.3 Measuring method 6.2.4 Definition and evaluation |
| 25 | 6.3 Chromaticity, colour uniformity, and colour gamut area 6.3.1 General 6.3.2 Measuring equipment 6.3.3 Screen centre chromaticity measuring method |
| 26 | 6.3.4 Screen centre colour gamut and colour gamut area measuring method Tables Table 1 – Input signals for CIELAB, CIE 1931 and CIE 1976 UCS colour gamut measurements |
| 27 | Figure 11 – Examples of the colour gamut as represented in two common chromaticity diagrams |
| 28 | 6.3.5 Colour uniformity measuring method Table 2 – Example of CIE 1976 UCS chromaticity non-uniformity |
| 29 | 6.4 Peak white field correlated colour temperature 6.4.1 General 6.4.2 Measuring equipment 6.4.3 Measuring method 6.5 Viewing direction dependence 6.5.1 General 6.5.2 Measuring equipment |
| 30 | 6.5.3 Measuring method |
| 31 | 6.5.4 Definition and evaluation Figure 12 – Example of contrast ratio dependence on viewing direction |
| 32 | 6.6 Cross-talk with display in bent state 6.6.1 General 6.6.2 Measuring equipment Table 3 – Example format used for reporting viewing direction performance |
| 33 | 6.6.3 Measuring method Figure 13 – Cross-talk pattern with diagonal 4 % white window boxes on grey background |
| 34 | Figure 14 – Cross-talk pattern with diagonal 4 % black window boxes on grey background Figure 15 – Cross-talk pattern with perpendicular 4 % white window boxes on grey background |
| 35 | 7 Optical measuring method under ambient illumination 7.1 Reflection measurements 7.1.1 General Figure 16 – Cross-talk pattern with perpendicular 4 % black window boxes on grey background |
| 36 | 7.1.2 Measuring conditions |
| 37 | Table 4 – Eigenvalues M1 and M2 for CIE daylight Illuminants D50 and D75 |
| 39 | 7.2 Ambient contrast ratio 7.2.1 General |
| 40 | 7.2.2 Measuring conditions 7.2.3 Measuring method 7.3 Ambient display colour 7.3.1 General |
| 41 | 7.3.2 Measuring conditions 7.3.3 Measuring method |
| 42 | 7.4 Ambient colour gamut volume 7.4.1 General 7.4.2 Measuring conditions 7.4.3 Measuring method |
| 43 | Table 5 – An example of minimum colours required for gamut volume calculation of a 3-primary 8-bit display |
| 44 | 7.4.4 Reporting Figure 17 – Example of the range in colours produced by a display |
| 45 | Table 6 – Measured tristimulus values for the minimum set of colours Table 7 – Calculated white point in the dark room and ambient illumination conditions Table 8 – Colour gamut volume in the CIELAB colour space |
| 46 | Annex A (informative)Calculation method of ambient 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 |
| 47 | 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 |
| 48 | A.3 Surface subdivision method for CIELAB gamut volume calculation A.3.1 Purpose A.3.2 Assumptions A.3.3 Algorithm Table A.3 – Example of sRGB colour gamut volume in the CIELAB colour space |
| 49 | A.3.4 Software example execution |
| 53 | Bibliography |
