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BS IEC 62977-2-1:2021

BS IEC 62977-2-1:2021

$215.11

Electronic displays – Measurements of optical characteristics. Fundamental measurements

Published By Publication Date Number of Pages
BSI 2021 86
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This part of IEC 62977 specifies standard measurement conditions and measuring methods for determining the optical characteristics of electronic display modules and systems. These methods apply to emissive and transmissive direct view displays that render real 2D images on a flat panel. This document evaluates the optical characteristics of these displays under darkroom conditions. This document applies to the testing of display performance in response to standard analogue or digital input signals that are not absolute luminance encoded. The input signal is relative RGB without metadata information that codes for real luminance, colour space or colour coordinates. These methods are limited to input signals with typical OETFs such as defined in IEC 61966-2-1, ITU BT. Rec. 601, ITU BT. Rec.709, and ITU BT. Rec.2020. The tests in this document are not approved for use with HDR input signals.

NOTE A flat panel or flat panel display is a display with a flat surface and minimal depth that emits visible light from the surface. The display is subdivided into an array of electronically driven pixels which can be light valves modulating a backlight, or self-luminous. Emissive/transmissive/reflective hybrid displays can be flat panel or flat panel displays.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
8 FOREWORD
10 INTRODUCTION
Tables
Table 1 – Summary of display characteristics
11 1 Scope
2 Normative references
12 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
13 3.2 Abbreviated terms
4 General
4.1 Measured basic quantities
4.2 Electrical driving of the display (depending on the nature of the display)
14 4.3 Data acquisition timing and display driving
4.3.1 Stationary measurements
4.3.2 Properties of display under test
5 Standard measuring conditions
5.1 Standard measuring environmental conditions
5.2 Standard measuring darkroom conditions
5.3 Standard setup conditions
5.3.1 General
5.3.2 Adjustment of display
15 5.3.3 Starting conditions of measurements
5.3.4 Conditions of measuring equipment
16 Figures
Figure 1 – Layout diagram of measurement setup with terminology
17 5.4 Location of measurement field
18 5.5 Standard test patterns
5.6 Viewing direction coordinate system
Figure 2 – Example of measurement locations with nine measurement locationsequally spaced in the display active area
19 6 Simple box optical measurement methods
6.1 General
6.2 Test patterns
Figure 3 – Representation of the viewing direction, or direction of measurement
20 6.3 Luminance
6.3.1 Purpose
6.3.2 Measuring conditions
6.3.3 Measuring method
Figure 4 – Example of centre box test patterns using the standard 4 % and10 % area boxes
21 6.4 Darkroom contrast ratio
6.4.1 Purpose
6.4.2 Measuring conditions
6.4.3 Measuring method
22 6.5 Luminance uniformity
6.5.1 Purpose
6.5.2 Measuring conditions
6.5.3 Measuring method
Figure 5 – Example of uniformity measurement locationswith nine measurement locations
23 6.6 Chromaticity
6.6.1 Purpose
6.6.2 Measuring conditions
Table 2 – Example of luminance of white, red, green, and blue measuredat nine screen locations and the resulting average luminance
24 6.6.3 Measuring method
6.7 White chromaticity and correlated colour temperature
6.7.1 Purpose
6.7.2 Measuring conditions
6.7.3 Measuring method
25 6.8 Chromaticity non-uniformity
6.8.1 Purpose
6.8.2 Measuring conditions
6.8.3 Measuring method
26 6.9 Chromaticity/colour gamut area
6.9.1 Purpose
6.9.2 Measuring conditions
Table 3 – Example of a white colour measured at nine screen locationsand the resulting chromaticity non-uniformity
27 6.9.3 Measuring method
Table 4 – Standard digital-equivalent input signals for rendering the white,primary and secondary colours in test patterns
28 Figure 6 – Examples of a display with colour boundaries representedby the black triangle in two common chromaticity diagrams
29 6.9.4 Chromaticity/colour gamut area in CIE 1931 and CIE 1976 chromaticity diagram
30 6.10 Luminance and colour variation with viewing direction
6.10.1 Purpose
6.10.2 Measuring conditions
6.10.3 Measuring method
31 Figure 7 – Top view example of configurations for measuring luminance and colourin the horizontal viewing direction
32 7 Display multi-colour optical measuring methods
7.1 General
7.2 Test patterns
Figure 8 – Side view example of configurations for measuring luminanceand colour in the vertical viewing direction
33 Figure 9 – Standard medium APL loading version of the colour tile test pattern with red,green, blue, and white boxes used for luminance and colour measurements
Figure 10 – Medium APL loading version of colour tile patterns illustrating the sequence of test patterns used for luminance and colour measurements
35 7.3 Luminance
7.3.1 Purpose
7.3.2 Measuring conditions
Figure 11 – Standard medium APL RGBCMY test pattern used forcentre luminance and colour measurements with 25 % APL
36 7.3.3 Measuring method
Figure 12 – Sequence for measuring luminance at the nine display locationsfor all coloured tile patterns
37 7.4 Darkroom contrast ratio
7.4.1 Purpose
7.4.2 Measuring conditions
7.4.3 Measuring method
7.5 Luminance uniformity
7.6 Chromaticity, tristimulus values, and spectra
7.6.1 Purpose
38 7.6.2 Measuring conditions
7.6.3 Measuring method
7.7 White chromaticity and correlated colour temperature
7.7.1 Purpose
7.7.2 Measuring conditions
7.7.3 Measuring method
39 7.8 Chromaticity/colour gamut area
7.8.1 Purpose
7.8.2 Measuring conditions
7.8.3 Measuring method
7.8.4 Chromaticity/colour gamut area in CIE 1931 and CIE 1976 chromaticity diagram
40 7.9 Chromaticity non-uniformity
7.10 Luminance and colour variation with viewing direction
7.10.1 Purpose
7.10.2 Measuring conditions
7.10.3 Measuring method
41 8 CIELAB colour gamut volume
8.1 Purpose
42 8.2 Measuring conditions
8.3 Measuring method
44 Figure 13 – Example of range in colours produced by a given displayas represented by the CIELAB colour space
Table 5 – Example of report format for CIELAB gamut volume
45 Annex A (normative)RGB boundary colours for CIELAB colour gamut volume measurements
A.1 General
A.2 Equally-spaced 98 boundary colours on the RGB cube
46 Table A.1 – Equally-spaced 98 RGB boundary colours used for CIELABcolour gamut volume measurements
48 A.3 Recommended 602 boundary colours on the RGB cube
Table A.2 – Recommended RGB boundary colours used for CIELABcolour gamut volume measurements
63 Annex B (informative)Calculation method for CIELAB gamut volume
B.1 Purpose
B.2 Procedure for calculating the colour gamut volume
Figure B.1 – Analysis flow chart for calculating the CIELAB gamut volume
64 B.3 Number of sampled colours
B.4 RGB cube surface subdivision method for CIELAB colour gamut volume calculation
66 Figure B.2 – Example of tessellation using a 5 x 5 gridof surface colours on the RGB cube
67 Table B.1 – Example data format used for CIELABcolour gamut volume measurements
68 Figure B.3 – Example of tessellation for the RGB cube using a 3 x 3 grid
Figure B.4 – Example of tessellation for the CIELAB gamut volume using a 3 x 3 grid
76 Annex C (informative)Significance of Clause 6
C.1 Summary
C.2 Significance of Clause 6 during the research and development stage
Figure C.1 – Example of conceptual scheme for the supply chain of displays and the usage of the measurement methods (MM) of Clause 6 and Clause 7
77 C.3 Significance of Clause 6 during the manufacturing stage
Figure C.2 – Conceptual example of the evaluation of the components
78 C.4 Significance of Clause 6 during the evaluation of other test results
Figure C.3 – Example of a mechanical stress test
79 Annex D (informative)Colour-signal luminance
80 Annex E (informative)Gamut rings
E.1 General
81 E.2 Visualization method
Figure E.1 – Example of transformation of the CIELAB gamut volume (top) illustrated by L* slices into the concentric areas of the gamut ring representation (bottom)
82 E.3 Software example
Figure E.2 – Example of calculation of gamut rings using the data from Table B.1
84 Bibliography

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BS IEC 62977-2-1:2021
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