IEC TS 62715-5-2:2016

Flexible display devices - Part 5-2: Measuring methods of optical characteristics from the vantage point for curved displays

IEC TS 62715-5-2:2016(E) specifies the general rules and the details of optical measuring methods from a fixed point (the so-called vantage point) for curved emissive and transmissive type displays such as OLED and LCD in dark room conditions. This document focuses on concave shape large screen displays (non-portable) around a horizontal and/or vertical axis with fixed or variable curvature radius. The measuring method stipulated in this technical specification is applied to the curved display modules under the following states:
- vantage-point luminance variation by viewing angles
- vantage-point contrast ratio variation by viewing angles
- vantage-point chromaticity variation of white colour by viewing angles
- vantage-point colour gamut area variation by viewing angles
- vantage-point chromaticity variation of primary colours by viewing angles
- luminance uniformity and its uniformity variation by viewing angles
- chromaticity uniformity and its uniformity variation by viewing angles
- viewing angle of half-luminance
- viewing angle of half-contrast.

General Information

• Status: Published
• Publication Date: 25-Apr-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.180 - Transformers. Reactors
• ICS: 31.120 - Electronic display devices
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 8 - TC 110/WG 8
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jul-2016
• Completion Date: 26-Apr-2016

Standards Content (Sample)

IEC TS 62715-5-2 ®
Edition 1.0 2016-04
TECHNICAL
SPECIFICATION
colour
inside
Flexible display devices –
Part 5-2: Measuring methods of optical characteristics from the vantage point
for curved displays
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IEC TS 62715-5-2 ®
Edition 1.0 2016-04
TECHNICAL
SPECIFICATION
colour
inside
Flexible display devices –
Part 5-2: Measuring methods of optical characteristics from the vantage point

for curved displays
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120 ISBN 978-2-8322-3300-9

– 2 – IEC TS 62715-5-2:2016 © IEC 2016
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms, definitions and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Abbreviations . 8
4 Standard measuring equipment . 8
4.1 Video signal generator . 8
4.2 Non-contact LMD . 8
5 Standard 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 Adjustment of display modules . 9
5.6 Measuring geometry for vantage point . 10
5.6.1 General . 10
5.6.2 Measuring geometry in horizontal vantage point . 10
5.6.3 Measuring geometry in vertical vantage point . 10
5.7 Measuring layout for viewing position . 11
5.7.1 General . 11
5.7.2 Measuring layout by moving LMD . 11
5.7.3 Measuring layout by rotating the display module . 12
5.8 Minimum curvature radius for the measurement . 13
5.9 Screen visual angle . 14
5.9.1 Screen visual angle of a flat display module . 14
5.9.2 Screen visual angle of concave type display module . 14
6 Measuring methods of optical characteristics . 15
6.1 General . 15
6.1.1 Measuring items . 15
6.1.2 Measuring point locations . 15
6.1.3 Test pattern . 16
6.2 Measuring method . 17
6.2.1 Measuring method at the screen centre position . 17
6.2.2 Measuring method at viewing angle position . 18
6.3 Optical characteristics of white box by viewing angle . 18
6.3.1 Luminance variation by viewing angle . 18
6.3.2 Contrast ratio variation by viewing angle . 19
6.3.3 Chromaticity variation by viewing angle . 20
6.4 Optical characteristics of colour box by viewing angle . 20
6.4.1 Colour gamut area variation by viewing angle . 20
6.4.2 Chromaticity variation and ΔE by viewing angle . 21
6.5 Uniformity and uniformity variation . 22
6.5.1 General . 22
6.5.2 Luminance uniformity and uniformity variation by viewing angle . 23
6.5.3 Chromaticity uniformity and uniformity variation by viewing angle . 23

6.6 Half-luminance and half-contrast viewing angle . 23
6.6.1 Half-luminance viewing angle range . 23
6.6.2 Half-contrast viewing angle range . 24
7 Reporting . 24
7.1 Requirements of reporting . 24
7.2 Recommendations of measurement results reporting . 25
Bibliography . 30

Figure 1 – Measuring layout for non-contact measurement . 9
Figure 2 – Measuring geometry in horizontal vantage point (top view) . 10
Figure 3 – Measuring geometry in vertical vantage point (side view) . 11
Figure 4 – Measuring geometry by horizontal viewing angles (top view) . 12
Figure 5 – Measuring geometry by horizontal display directions (top view) . 13
Figure 6 – Minimum concave type curvature radius for the measurement (top view) . 14
Figure 7 – Screen visual angle of concave type display device (top view) . 15
Figure 8 – 9-point locations for vantage-point measurement . 16
Figure 9 – Nine white boxes for vantage-point measurement . 16
Figure 10 – Nine measuring points for vantage-point black measurement . 17
Figure 11 – Nine-colour boxes of R, G and B for vantage-point measurement . 17
Figure 12 – Measuring directions of 9 vantage points . 17
o o o o
Figure 13 – Measuring directions (right side) by viewing angle 0 , 15 , 30 and 45 . 18
Figure 14 – Measuring directions (right side) by viewing angle 0°, 15°, 30° and 45°
(front upper view). 18
Figure 15 – Measuring method for half-luminance viewing angle . 23

Table 1 – Example of measurement results for the optical characteristics. 26
Table 2 – Calculation results from the measurement data of Table 1 . 28

– 4 – IEC TS 62715-5-2:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLEXIBLE DISPLAY DEVICES –
Part 5-2: Measuring methods of optical characteristics
from the vantage point for curved displays

FOREWORD
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