IEC 62977-3-5:2023

Electronic displays - Part 3-5: Evaluation of optical performance - Colour capabilities

IEC 62977-3-5:2023 specifies standard evaluation methods for determining the colour capabilities of electronic display modules and systems with respect to colour accuracy, colour gamut volume, and their intersection with a reference colour space. Also included is evaluation with respect to the chromaticity gamut area. These methods apply to emissive and transmissive direct view displays that render real 2D images on a flat panel or on a curved panel with a local radius of curvature larger than 1 500 mm. 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 opto-electronic transfer functions (OETFs) such as defined in IEC 61966‑2‑1, Recommendation ITU-R BT.601 [18][1], Recommendation ITU-R BT.709, and Recommendation ITU-R BT.2020. The tests in this document are not suitable for use with HDR input signals.
This document contains attached files in the form of Microsoft Excel spreadsheet and App installer. These files are intended to be used as a complement and do not form an integral part of the standard.
The content of the corrigendum 1 (2024-10) has been included in this copy.

General Information

• Status: Published
• Publication Date: 25-Sep-2023
• ICS: 31.120 - Electronic display devices
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 13 - TC 110/WG 13
• Current Stage: PPUB - Publication issued
• Start Date: 20-Oct-2023
• Completion Date: 26-Sep-2023

Relations

• Corrected By: IEC 62977-3-5:2023/COR1:2024 - Corrigendum 1 - Electronic displays - Part 3-5: Evaluation of optical performance - Colour capabilities
• Effective Date: 27-Sep-2024

Standards Content (Sample)

IEC 62977-3-5 ®
Edition 1.0 2023-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electronic displays –
Part 3-5: Evaluation of optical performance – Colour capabilities

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IEC 62977-3-5 ®
Edition 1.0 2023-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electronic displays –
Part 3-5: Evaluation of optical performance – Colour capabilities

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.120, 31.260 ISBN 978-2-8322-7551-1

– 2 – IEC 62977-3-5:2023 © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 10
4 Standard measuring equipment . 10
4.1 Video signal generator . 10
4.2 Conditions of measuring equipment . 10
4.3 Test equipment block diagram . 10
5 Standard measuring conditions . 12
5.1 Standard measuring environmental conditions . 12
5.2 Standard measuring darkroom conditions . 12
5.3 Standard setup conditions . 13
5.4 Standard test pattern . 13
6 Evaluation of colour and chromaticity capabilities . 14
6.1 Chromaticity gamut and primary colour . 14
6.1.1 Measured data for chromaticity gamut area . 14
6.1.2 Absolute chromaticity gamut area . 15
6.1.3 Chromaticity gamut intersection area . 16
6.1.4 Chromaticity and colour difference for primary colour additivity by
location on the screen . 18
6.1.5 Measuring method of chromaticity and colour difference for primary
colour additivity by location on the screen. 21
6.2 Chromaticity gamut area by input level. 22
6.2.1 Measured data . 22
6.2.2 Measuring method . 23
6.2.3 Evaluation of chromaticity gamut area by input level . 24
6.3 Chromaticity gamut area by viewing direction . 25
6.3.1 Measuring method . 25
6.3.2 Evaluation of chromaticity gamut area by viewing direction . 25
6.4 RGB primaries additivity of mixed colour . 26
6.4.1 Overview and measured data . 26
6.4.2 Measuring method . 28
6.4.3 Evaluation of additive colour mixture by input variation from colour to
white. 29
6.5 Colour reference-based colour reproduction accuracy . 31
6.5.1 Colour reference pattern . 31
6.5.2 Measuring method . 36
6.5.3 Evaluation of colour reproduction accuracy . 37
6.5.4 Evaluation of chromaticity shift by viewing direction . 38
6.6 Colour gamut volume by viewing direction . 40
6.6.1 Purpose . 40
6.6.2 Measuring method . 40
6.6.3 Evaluation of colour gamut volume by viewing direction . 41
6.7 Colour gamut intersection volume and gamut rings . 42

6.7.1 Purpose of colour gamut intersection volume . 42
6.7.2 Evaluation of colour gamut intersection volume . 42
6.7.3 Evaluation using Gamut Rings . 42
7 Reporting. 42
7.1 Reporting information requirements . 42
7.2 Measurement results requirements . 43
Annex A (informative) Alternative colour gamut volume evaluation . 45
A.1 General . 45
A.2 Measuring method for colour gamut volume at various viewing directions . 45
A.3 Interpolation of colour coordinates . 46
A.4 Alternative method for colour gamut intersection volume . 49
A.5 Spreadsheets for colour gamut related evaluation . 51
Annex B (normative) Tool for colour gamut calculation and visualization . 54
B.1 General . 54 ®
B.2 Installation and launching (Windows ) . 54
B.3 Reading input files . 54
B.4 Graph selection. 55
B.5 Graph layout . 55
B.6 CIE 1976 L*a*b* and CIE 1931 xyY plots . 56
B.7 CIE 1931 xy chromaticity diagram . 57
B.8 Gamut rings . 58
B.9 Exporting graphs . 60
B.10 Support . 61
Bibliography . 62

Figure 1 – Measuring layout for a telescopic LMD . 11
Figure 2 – Measuring layout for a close-up type LMD . 11
Figure 3 – Setup for viewing directional measurements. 12
Figure 4 – Standard multi-colour pattern for centre box measurement . 14
Figure 5 – Example of chromaticity gamut area measurements . 16
Figure 6 – Example of gamut area intersection in Recommendation ITU-R BT.709 . 18
Figure 7 – Example of absolute chromaticity gamut area dependence on input level
normalized to the value at maximum input level (255) .
...