Electronic displays - Part 3-1: Evaluation of optical performances - Colour difference based viewing direction dependence

IEC TS 62977-3-1:2019(E) specifies the evaluation method of the viewing direction characteristics of electronic display devices under dark-room conditions. More specifically, this document focuses on the evaluation of the viewing direction characteristics based on colour difference.
This document applies to colour matrix displays, which are based on transmissive or emissive technologies.

General Information

Status
Published
Publication Date
12-Feb-2019
Technical Committee
Drafting Committee
Current Stage
PPUB - Publication issued
Start Date
04-Mar-2019
Completion Date
13-Feb-2019
Ref Project

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IEC TS 62977-3-1:2019 - Electronic displays - Part 3-1: Evaluation of optical performances - Colour difference based viewing direction dependence
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IEC TS 62977-3-1 ®
Edition 1.0 2019-02
TECHNICAL
SPECIFICATION
colour
inside
Electronic displays –
Part 3-1: Evaluation of optical performances – Colour difference based viewing
direction dependence
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IEC TS 62977-3-1 ®
Edition 1.0 2019-02
TECHNICAL
SPECIFICATION
colour
inside
Electronic displays –
Part 3-1: Evaluation of optical performances – Colour difference based viewing

direction dependence
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120; 21.260 ISBN 978-2-8322-6515-4

– 2 – IEC TS 62977-3-1:2019  IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 General . 7
3.2 Abbreviated terms . 7
4 Standard measuring equipment and coordinate system . 8
4.1 Light measuring device . 8
4.2 Viewing direction coordinate system . 8
5 Measuring conditions . 9
5.1 Standard measuring environmental conditions . 9
5.2 Power supply . 9
5.3 Warm-up time . 9
5.4 Standard measuring dark-room conditions . 9
5.5 Standard set-up conditions . 9
5.5.1 General . 9
5.5.2 Adjustment of display . 9
6 Measurement methods . 10
6.1 Measurement procedures . 10
6.2 Test signals (test charts) . 11
7 Calculation of chromaticity and colour difference . 12
8 Reporting. 15
Annex A (informative)  Perception of colour difference . 19
Annex B (informative)  Other attenuation factors . 20
B.1 General . 20
B.2 Attenuation factors proposed . 20
Annex C (informative)  Other parameters . 21
C.1 Measurement of half luminance angle . 21
C.2 Measurement of gamma distortion from the viewing directions . 21
Annex D (informative)  Translation of RGB input signal to output colours . 24
Annex E (informative)  Simulation result of chromaticity error versus number of pixels
in the measurement area . 28
E.1 General . 28
E.2 Simulation conditions . 28
E.3 Simulation result . 29
Bibliography . 31

θ and φ . 8
Figure 1 – Illustration of viewing directions
Figure 2 – Measuring layout for horizontal viewing direction dependency . 10
Figure 3 – Measuring layout for vertical viewing direction dependency . 11
Figure C.1 – Test pattern for gamma measurement . 22
Figure C.2 – Example of linear regression of log(△L ) versus log(△V ) in normal
j j
direction (0°) . 23
Figure E.1 – Relative spectral radiance (left: LCD, right: OLED) . 28

Figure E.2 – Measuring area versus DUT pixels. 29
Figure E.3 – Number of measuring pixels versus chromaticity error . 30

Table 1 – Measurement directions for TV in living rooms . 11
Table 2 – Measurement directions for mobile displays . 11
Table 3 – Input signal of 4 % window for viewing direction measurements . 12
Table 4 – Attenuation factors . 14
Table 5 – Parametric factors . 15
Table 6 – Example of reporting format . 16
Table A.1 – Perception of colour difference . 19
Table B.1 –- Attenuation factors . 20
Table C.1 – Worked-out example for gamma distortion from viewing direction . 23
Table D.1 – Test colours . 24
Table D.2 – RGB translation values for 8-bit colour (BT.2020 colour reference) . 25
Table D.3 – RGB translation values for 10-bit colour (BT.2020 colour reference) . 26
Table D.4 – RGB translation values for 10 bit colour (BT.709 colour reference) . 27
Table E.1– DUT’s primary chromaticity and chromaticity area gamut (% NTSC) . 28
Table E.2 – Number of sub-pixels in the measurement area . 29
Table E.3 – Simulation result of chromaticity error (around 100 pixels) . 29

– 4 – IEC TS 62977-3-1:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRONIC DISPLAYS –
Part 3-1: Evaluation of optical performances – Colour difference based
viewing direction dependence
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