Laser display devices - Part 5-3: Measuring methods of image quality for laser projection displays

IEC 62906-5-3:2021(E) specifies the standard measurement conditions and measuring methods for determining the parameters of image quality for full-frame laser projection displays integrating the projection devices and screens. The front and rear projection screens are included in this document. Other display devices, such as raster-scanned (flying spot) projection devices, are not included.

General Information

Status
Published
Publication Date
02-Feb-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
03-Feb-2021
Ref Project

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IEC 62906-5-3:2021 - Laser display devices - Part 5-3: Measuring methods of image quality for laser projection displays
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IEC 62906-5-3
Edition 1.0 2021-02
INTERNATIONAL
STANDARD
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inside
Laser display devices –
Part 5-3: Measuring methods of image quality for laser projection display
IEC 62906-5-3:2021-02(en)
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---------------------- Page: 2 ----------------------
IEC 62906-5-3
Edition 1.0 2021-02
INTERNATIONAL
STANDARD
colour
inside
Laser display devices –
Part 5-3: Measuring methods of image quality for laser projection display
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.260 ISBN 978-2-8322-9316-4

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62906-5-3:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions, and abbreviated terms ....................................................................... 6

3.1 Terms and definitions .............................................................................................. 6

3.2 Abbreviated terms ................................................................................................... 7

4 Standard measuring conditions ........................................................................................ 7

4.1 General ................................................................................................................... 7

4.2 Environmental conditions ........................................................................................ 7

4.3 Power supply .......................................................................................................... 7

4.4 Warm-up time ......................................................................................................... 7

4.5 Dark ambient conditions .......................................................................................... 7

4.6 Measuring equipment .............................................................................................. 7

5 Installation and adjustment of the DUT ............................................................................ 8

5.1 Placement of the projection device and screen ....................................................... 8

5.2 Focusing and alignment of the LPD ......................................................................... 8

6 Test patterns ................................................................................................................. 10

6.1 Full screen patterns .............................................................................................. 10

6.2 Checkerboard patterns .......................................................................................... 10

7 Measuring methods ....................................................................................................... 10

7.1 Luminance uniformity ............................................................................................ 10

7.1.1 Purpose ......................................................................................................... 10

7.1.2 Measuring conditions ..................................................................................... 11

7.1.3 Patterns ......................................................................................................... 11

7.1.4 Measuring method ......................................................................................... 11

7.1.5 Report ........................................................................................................... 12

7.2 Contrast ratio uniformity ........................................................................................ 12

7.2.1 Purpose ......................................................................................................... 12

7.2.2 Measuring conditions ..................................................................................... 12

7.2.3 Patterns ......................................................................................................... 12

7.2.4 Measuring method ......................................................................................... 12

7.2.5 Report ........................................................................................................... 13

7.3 Viewing direction .................................................................................................. 13

7.3.1 Purpose ......................................................................................................... 13

7.3.2 Measuring conditions ..................................................................................... 13

7.3.3 Patterns ......................................................................................................... 14

7.3.4 Measuring method ......................................................................................... 14

7.4 Chromaticity uniformity ......................................................................................... 14

7.4.1 Purpose ......................................................................................................... 14

7.4.2 Measuring conditions ..................................................................................... 14

7.4.3 Patterns ......................................................................................................... 15

7.4.4 Measuring method ......................................................................................... 15

7.4.5 Report ........................................................................................................... 15

7.5 Image resolution ................................................................................................... 15

7.5.1 Purpose ......................................................................................................... 15

7.5.2 Measuring conditions ..................................................................................... 15

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IEC 62906-5-3:2021 © IEC 2021 – 3 –

7.5.3 Measuring method ......................................................................................... 16

7.5.4 Calculation .................................................................................................... 16

7.5.5 Report ........................................................................................................... 17

Bibliography .......................................................................................................................... 18

Figure 1 – Example of an image pattern with width W and height H ......................................... 9

Figure 2 – Example of DUT setup ........................................................................................... 9

Figure 3 – Full screen patterns ............................................................................................. 10

Figure 4 – Examples of checkerboard patterns ..................................................................... 10

Figure 5 – Measurement points ............................................................................................. 11

Figure 6 – Set-up for viewing direction measurement ............................................................ 14

Figure 7 – Example of contrast modulation measurement ..................................................... 17

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– 4 – IEC 62906-5-3:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LASER DISPLAY DEVICES –
Part 5-3: Measuring methods of image quality
for laser projection displays
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 62906-5-3 has been prepared by IEC technical committee 110: Electronic displays. It is an

International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
110/1269/FDIS 110/1285/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.
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IEC 62906-5-3:2021 © IEC 2021 – 5 –

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

A list of all parts in the IEC 62906 series, published under the general title Laser display devices,

can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
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– 6 – IEC 62906-5-3:2021 © IEC 2021
LASER DISPLAY DEVICES –
Part 5-3: Measuring methods of image quality
for laser projection displays
1 Scope

This document specifies the standard measurement conditions and measuring methods for

determining the parameters of image quality for full-frame laser projection displays integrating

the projection devices and screens. The front and rear projection screens are included in this

document. Other display devices, such as raster-scanned (flying spot) projection devices, are

not included.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 60050-845, International Electrotechnical Vocabulary (IEV) – Part 845: Lighting

IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements

IEC TR 60825-8, Safety of laser products – Part 8: Guidelines for the safe use of laser beams

on humans

IEC 62341-6-3:2017, Organic light emitting diode (OLED) displays – Part 6-3: Measuring

methods of image quality

IEC 62471-5, Photobiological safety of lamps and lamp systems – Part 5: Image projectors

IEC 62906-1-2, Laser display devices – Part 1-2: Vocabulary and letter symbols
ISO/CIE 11664-1, Colorimetry – Part 1: CIE standard colorimetric observers

ISO/CIE 19476, Characterization of the performance of illuminance meters and luminance

meters
CIE 63, The spectroradiometric measurement of light sources
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-845,

IEC 62906-1-2 and ISO/CIE 11664-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
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IEC 62906-5-3:2021 © IEC 2021 – 7 –
3.2 Abbreviated terms
DUT Device under test
LDD Laser display device
LPD Laser projection display
LMD Light measuring device
4 Standard measuring conditions
4.1 General

Unless stated otherwise, the following conditions shall be applied. During the measurement,

the protection of optical radiation safety shall be implemented according to IEC 60825-1 and

IEC TR 60825-8 for the products with a classification over M2, and IEC 62471-5 for RG2 and

RG3.
4.2 Environmental conditions
Measurements shall be carried out under the standard environmental conditions:
– temperature: 25 °C ± 3 °C,
– relative humidity: 25 % to 85 % RH,
– atmospheric pressure: 86 kPa to 106 kPa.

When different environmental conditions are used, they shall be noted in the measurement

report.
4.3 Power supply

The power supply for driving the DUT shall be adjusted to the rated voltage ± 0,5 %, and the

frequency shall be supplied at the rated frequency ± 0,2 %.
4.4 Warm-up time

The measurements should be carried out after the light output is sufficiently stable. It is defined

as the time elapsed from when the supply source is switched on, and a full level of input signal

is applied to the DUT, until the repeated measurements with the interval of one minute show a

variation within ten minutes in luminance (or illuminance) of less than 3 %.
4.5 Dark ambient conditions

The LPDs are intended to be measured under the dark room conditions. Any background

illuminance at the image plane shall be less than 1 % of the projector maximum illuminance

when measured with a projector mask blocking the direct beam from the projector (for example

refer to [1] in 15.1.4). The measurements should be conducted in a room with matte black

surfaces having a photometric reflectance of less than 3 %.
4.6 Measuring equipment

The configurations and operating conditions of the measuring equipment shall comply with the

requirements specified in each item. Unless stated otherwise, the measurement point shall be

at the centre of the image area to be measured. The measurement area at the image plane

shall be at least 1 cm in diameter and contain at least 10 pixels x 10 pixels. It shall be confirmed

that this number of pixels is sufficient by shifting the LMD 20 % laterally and verifying that the

luminance is less than 2 %. A large enough measurement area is needed to average out

speckle-induced non-uniformity; in addition, the entrance pup
...

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