Eyewear display - Part 21-20: Specific measurement methods for VR image quality - Screen door effect

IEC 63145-21-20:2022(E) specifies the standard measurement conditions and measurement methods for determining the screen door effect (SDE), which is one of the image quality aspects of eyewear displays of virtual reality (VR) type.

General Information

Status
Published
Publication Date
26-Jul-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
27-Jul-2022
Ref Project

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IEC 63145-21-20:2022 - Eyewear display - Part 21-20: Specific measurement methods for VR image quality - Screen door effect
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IEC 63145-21-20
Edition 1.0 2022-07
INTERNATIONAL
STANDARD
colour
inside
Eyewear display –
Part 21-20: Specific measurement methods for VR image quality – Screen door
effect
IEC 63145-21-20:2022-07(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63145-21-20
Edition 1.0 2022-07
INTERNATIONAL
STANDARD
colour
inside
Eyewear display –
Part 21-20: Specific measurement methods for VR image quality – Screen door
effect
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.180.99; 31.120 ISBN 978-2-8322-4253-7

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 63145-21-20:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms, definitions and abbreviated terms ........................................................................ 5

3.1 Terms and definitions .............................................................................................. 5

3.2 Abbreviated terms ................................................................................................... 6

4 Standard measurement conditions ................................................................................... 6

5 Measurement systems ..................................................................................................... 6

5.1 Standard coordinate system .................................................................................... 6

5.2 Measurement equipment ......................................................................................... 6

5.2.1 2D imaging LMD .............................................................................................. 6

5.2.2 Stage conditions .............................................................................................. 6

5.2.3 Setup conditions .............................................................................................. 6

5.3 Test patterns........................................................................................................... 7

5.3.1 General ........................................................................................................... 7

5.3.2 Checkerboard pattern ...................................................................................... 7

5.3.3 4 % colour window signal patterns ................................................................... 7

5.4 Measuring points .................................................................................................... 8

6 Measurement methods for screen door effect .................................................................. 9

6.1 General ................................................................................................................... 9

6.2 Preparations ........................................................................................................... 9

6.3 Measurement procedures ...................................................................................... 10

6.4 Calculation ............................................................................................................ 10

6.5 Report................................................................................................................... 12

Annex A (informative) Moving window average (MWA) ......................................................... 14

Annex B (informative) Contrast modulation and visibility ...................................................... 18

Annex C (informative) Examples of non rectangular pixel layout .......................................... 19

Bibliography .......................................................................................................................... 20

Figure 1 – Example of 5 × 5 checkerboard pattern .................................................................. 7

Figure 2 – Example of 4 % white window signal pattern .......................................................... 7

Figure 3 – Example of measuring points for the centre and multi-point measurements ............ 8

Figure 4 – Example of measuring points in azimuth and elevation angles ............................... 9

Figure A.1 – Example of pseudo code of MWA...................................................................... 15

Figure A.2 – Example of MWA conversion of 2D luminance data (image) .............................. 16

Figure A.3 – Example of the horizontal cross section ............................................................ 17

Figure B.1 – Example of MWA image and contrast modulation .............................................. 18

Figure B.2 – Visibility under various spatial frequency and contrast ...................................... 18

Figure C.1 – Example of non rectangular pixel layout ........................................................... 19

Table 1 – Example of report table ......................................................................................... 13

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IEC 63145-21-20:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EYEWEAR DISPLAY –
Part 21-20: Specific measurement methods
for VR image quality – Screen door effect
FOREWORD

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IEC 63145-21-20 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
110/1433/FDIS 110/1444/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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– 4 – IEC 63145-21-20:2022 © IEC 2022

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/publications.

A list of all parts in the IEC 63145 series, published under the general title Eyewear display,

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
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it

contains colours which are considered to be useful for the correct understanding of its

contents. Users should therefore print this document using a colour printer.
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IEC 63145-21-20:2022 © IEC 2022 – 5 –
EYEWEAR DISPLAY –
Part 21-20: Specific measurement methods
for VR image quality – Screen door effect
1 Scope

This part of IEC 63145 specifies the standard measurement conditions and measurement

methods for determining the screen door effect (SDE), which is one of the image quality aspects

of eyewear displays of virtual reality (VR) type.
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 63145-1-2, Eyewear display – Part 1-2: Generic – Terminology

IEC 63145-20-10:2019, Eyewear display – Part 20-10: Fundamental measurement methods –

Optical properties

IEC 63145-20-20, Eyewear display – Part 20-20: Fundamental measurement methods – Image

quality
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 63145-1-2 and the

following apply.

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

addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
screen door effect
SDE

visibility of inter-pixel areas due to a spatial display resolution lower than that of the human

visual system or to an insufficient pixel fill-factor/aperture ratio
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– 6 – IEC 63145-21-20:2022 © IEC 2022
3.2 Abbreviated terms
2D two dimensional
CCD charge-coupled device
DUT device under test
LMD light measuring device
MWA moving window average
VR virtual reality
4 Standard measurement conditions

Standard measurement conditions (standard environmental conditions, power supply, warm-up

time, dark room conditions) shall comply with IEC 63145-20-10 and IEC 63145-20-20.

5 Measurement systems
5.1 Standard coordinate system

The standard coordinate system shall comply with IEC 63145-20-10 and IEC 63145-20-20.

5.2 Measurement equipment
5.2.1 2D imaging LMD

The 2D imaging light measuring device (LMD) shall comply with IEC 63145-20-10 and

IEC 63145-20-20, if not described otherwise in the following paragraphs.

The 2D imaging LMD (using a two-dimensional sensor such as a CCD) is a kind of a filter-type

LMD. The performances of the 2D imaging LMD shall comply with the LMD specified in

IEC 63145-20-10 and IEC 63145-20-20. A 2D imaging LMD that can capture at least a ±2,5°

measurement field shall be used. The measurement field shall be less than 18°. The valid

measurement field angle of the 2D imaging LMD shall be confirmed and the peripheral image

of the 2D imaging LMD shall confirm the absence of vignetting. The 2D imaging LMD should

have a minimum performance of 30 cycles per degree with 50 % Michelson contrast at the

entrance pupil of 2 mm to 5 mm. The optical measurement capabilities of the LMD, such as

luminance and spectral radiance, should be traceable to national metrology standards under

the same conditions (for example entrance pupil size, measurement field angle and focus

distance in some structures).

NOTE 1 The measurement field of some 2D imaging LMDs is affected by the smaller entrance aperture. The 2D

imaging LMD will have an entrance pupil between 2 mm to 5 mm. (See [1] , [2] for the effect of aperture size.)

NOTE 2 Moiré effect might occur in the 2D imaging LMD due to factors such as pixel structure, rotational

misalignment, etc. If moiré occurs, the measurement cannot be performed. (See [3] for more information about moiré.)

NOTE 3 The peripheral 2D luminance data of the 2D imaging LMD can include vignetting. The valid measurement

field angle can include only 2D luminance data without such peripheral 2D luminance data.

5.2.2 Stage conditions
Stage conditions shall comply with IEC 63145-20-10 and IEC 63145-20-20.
5.2.3 Setup conditions
Setup conditions shall comply with IEC 63145-20-10 and IEC 63145-20-20.
____________
Numbers in square brackets refer to the Bibliography.
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IEC 63145-21-20:2022 © IEC 2022 – 7 –
5.3 Test patterns
5.3.1 General

The following test patterns shall be specified, and the applied test pattern shall be noted in the

report. When other test patterns are applied, they shall be noted in the report.
5.3.2 Checkerboard pattern

The checkerboard pattern as shown in Figure 1 should be used to measure the applicable

properties and can be us
...

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