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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
FOREWORD
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