IEC 62906-5-1:2021

Laser displays - Part 5-1: Measurement of optical performance for laser front projection

IEC 62906-5-1:2021(E) specifies the standard measurement conditions and measurement methods for front projection displays without screen which use lasers or laser hybrids as light sources. The hybrid light sources can use both lasers and spontaneous emission-based light sources. This document covers optical performance measurements for full-frame projection technologies such as digital micro mirror devices (DMDs), liquid crystal on silicon (LCOS), and liquid crystal display (LCD) projectors. Other displays, such as raster-scanned (flying spot) projection displays, are not included.

General Information

• Status: Published
• Publication Date: 09-Nov-2021
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 10 - TC 110/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 10-Dec-2021
• Completion Date: 10-Nov-2021

Standards Content (Sample)

IEC 62906-5-1 ®
Edition 1.0 2021-11
INTERNATIONAL
STANDARD
colour
inside
Laser displays –
Part 5-1: Measurement of optical performance for laser front projection
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IEC 62906-5-1 ®
Edition 1.0 2021-11
INTERNATIONAL
STANDARD
colour
inside
Laser displays –
Part 5-1: Measurement of optical performance for laser front projection

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.260 ISBN 978-2-8322-1049-5

– 2 – IEC 62906-5-1:2021 © IEC 2021
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 8
4 Standard measuring conditions . 8
4.1 General . 8
4.2 Standard measuring environmental conditions . 9
4.3 Standard dark room conditions. 9
4.4 Standard conditions of measuring equipment . 9
4.5 Conditions of measuring equipment . 10
4.5.1 General conditions . 10
4.5.2 Measurement coordinate system . 13
4.5.3 Diffuse reflectance standard . 13
4.5.4 Illuminance meter . 14
4.5.5 Colorimeter . 14
4.5.6 Signal source of test patterns . 14
4.5.7 Integrating sphere . 14
4.5.8 Spectral radiance/irradiance meters. 15
5 Adjustment of the laser projector . 15
5.1 Projector and image plane placement . 15
5.2 Focusing of the projector . 15
5.3 Standard projector setup conditions . 16
5.4 Standard image measurement locations . 16
5.5 Colour tile patterns . 17
5.6 RGBCMY colour pattern . 18
5.7 Measuring the projected image area . 19
5.8 Maintaining the normal working conditions . 20
6 Measuring methods . 20
6.1 Light output . 20
6.2 Spectroradiometric measurements . 20
6.2.1 General . 20
6.2.2 Measuring equipment . 20
6.2.3 Measuring method . 20
6.2.4 Data analysis . 21
6.3 Illuminance uniformity . 21
6.3.1 General . 21
6.3.2 Measuring equipment . 21
6.3.3 Measuring method . 22
6.4 Contrast ratio . 22
6.4.1 General . 22
6.4.2 Measuring equipment . 22
6.4.3 Measuring method . 22
6.5 Chromaticity coordinates . 23
6.5.1 General . 23

6.5.2 Measuring equipment . 23
6.5.3 Measuring method . 23
6.5.4 Data analysis . 24
6.6 White point chromaticity coordinates and correlated colour temperature . 24
6.6.1 General . 24
6.6.2 Measuring equipment . 24
6.6.3 Measuring method . 25
6.6.4 Data calculation . 25
6.7 Greyscale illuminance and chromaticity coordinates . 25
6.7.1 General . 25
6.7.2 Measuring equipment . 25
6.7.3 Measuring method . 25
6.8 Colour uniformity . 26
6.8.1 General . 26
6.8.2 Measuring equipment . 26
6.8.3 Measuring method . 26
6.8.4 Data analysis . 27
6.9 Colour gamut . 27
6.9.1 General . 27
6.9.2 Chromaticity gamut area . 28
6.9.3 CIELAB gamut volume . 30
Annex A (normative) RGB boundary colours for CIELAB gamut volume measurements . 33
A.1 General . 33
A.2 Equally spaced 98 boundary colours on the RGB cube . 33
A.3 Recommended 602 boundary colours on the RGB cube . 36
Annex B (informative) Calculation method for CIELAB gamut volume. 51
B.1 Purpose . 51
B.2 Procedure for calculating the colour gamut volume . 51
B.3 Number of sampled colours . 52
B.4 RGB cube surface subdivision method for CIELAB gamut volume calculation . 52
B.4.1 General . 52
B.4.2 Assumption . 52
B.4.3 Uniform RGB grid algorithm . 53
B.4.4 Software example execution . 55
Annex C (informative) Calculation method for chromaticity gamut area overlap . 63
C.1 Purpose . 63
C.2 Chromaticity gamut area overlap . 63
Annex D (informative) Light output . 64
D.1 White light output (WLO) method . 64
D.1.1 Purpose . 64
D.1.2 Measuring equipment . 64
D.1.3 Measuring method . 64
D.1.4 Data calculation . 64
D.2 Colour-signal white (CSW) method . 65
D.2.1 Purpose . 65
D.2.2 Measuring equipment . 65
D.2.3 Measuring method . 65
D.2.4 Data calculation . 66

– 4 – IEC 62906-5-1:2021 © IEC 2021
Bibliography . 67

Figure 1 – Virtual screen setup with (a) the illuminance LMD or (b) reflectance
standard placed at the projector image plane for standard measurements . 12
Figure 2 – Polar coordinate system used to describe the inclinati
...