IEC 62629-12-1:2014

3D Display devices - Part 12-1: Measuring methods for stereoscopic displays using glasses - Optical

IEC 62629-12-1:2014 determines the following measuring methods for characterizing the performance of stereoscopic display devices using either active or passive glasses. This standard focuses on the types of stereoscopic displays using glasses as follows:
The types of stereoscopic displays reproducing temporally interlaced images and applicable glasses are:
- displays representing temporally interlaced (high frame rate) images and active glasses (time dividing shutter glasses), and
- displays with front screen switchable polarizer representing temporally interlaced images and linear or circular polarizer passive glasses. The types of stereoscopic displays reproducing spatially interlaced images and applicable glasses are:
- displays with patterned retarder representing spatially interlaced images and linear or circular polarizer passive glasses. Some parts of these measuring methods may also be applied to other types of stereoscopic displays using glasses not listed above.

Dispositifs d'affichage 3D - Partie 12-1: Méthodes de mesure pour les écrans stéréoscopiques utilisant des lunettes - Optique

L'IEC 62629-12-1:2014 détermine les méthodes de mesure suivantes qui permettent de caractériser l'exécution des dispositifs d'affichage stéréoscopiques, utilisant des lunettes actives ou des lunettes passives. La présente norme se concentre sur les types d'écrans stéréoscopiques utilisant des lunettes comme suit:
Les types d'écrans stéréoscopiques qui reproduisent des images entrelacées dans le temps et des lunettes applicables sont:
- les écrans qui représentent des images entrelacées dans le temps (fréquence de trames élevée) et des lunettes actives (lunettes à obturateur temporel), et
- les écrans avec polariseur commutable sur écran de projection qui représentent des images entrelacées dans le temps et des lunettes passives à polariseur linéaire ou circulaire. Les types d'écrans stéréoscopiques qui reproduisent des images entrelacées dans l'espace et des lunettes applicables sont:
- les écrans avec retardateur modelé qui représentent des images entrelacées dans l'espace et des lunettes passives à polariseur linéaire ou circulaire. Certaines parties de ces méthodes de mesure peuvent également être appliquées à d'autres types d'écrans stéréoscopiques utilisant des lunettes non énumérés ci-dessus.

General Information

• Status: Published
• Publication Date: 08-Jan-2014
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.120 - Electronic display devices
• ICS: 31.260 - Optoelectronics. Laser equipment
• Technical Committee: TC 110 - Electronic displays
• Drafting Committee: WG 6 - TC 110/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jan-2014
• Completion Date: 09-Jan-2014

Overview

IEC 62629-12-1:2014 is an international standard published by the International Electrotechnical Commission (IEC) that specifies optical measuring methods for stereoscopic 3D display devices that utilize glasses. This standard focuses on characterizing the performance of displays employing either active shutter glasses or passive polarized glasses. It covers a variety of stereoscopic display types, including those reproducing temporally interlaced images and spatially interlaced images, with applicable glasses such as time dividing shutter glasses and linear or circular polarizer passive glasses.

The document outlines precise procedures and conditions for measuring key optical parameters to ensure consistent performance evaluation of 3D display devices and their associated glasses. IEC 62629-12-1:2014 serves as a critical reference for manufacturers, testers, and researchers developing or assessing stereoscopic display technologies in the audiovisual and electronics industries.

Key Topics

Measuring Methods Covered:

• Luminance and luminance uniformity, including interocular luminance differences.
• Dark-room contrast ratio and interocular contrast difference.
• Colour gamut and white chromaticity measurements.
• Interocular crosstalk evaluation, both at screen center and across screen positions.
• Viewing direction dependency and viewing distance dependency examinations.
• Impact of in-plane rotation and tilt of the glasses on stereoscopic image quality.
• Optical characteristics of the glasses themselves, including transmittance, extinction ratio, and chromaticity differences at open and closed states.

Types of Stereoscopic Displays and Glasses:

• Temporally interlaced image displays paired with active (time dividing shutter) glasses.
• Temporally interlaced image displays with front screen switchable polarizers paired with linear or circular polarized passive glasses.
• Spatially interlaced image displays using patterned retarders with passive linear or circular polarized glasses.

Measurement Conditions and Equipment:

• Standardized environmental and setup conditions including measurement distance and viewing angles.
• Use of light measuring devices (LMDs), light sources, polarizers, and optical band-pass filters.
• Testing under dark-room conditions to ensure accuracy.
• Use of specialized input video signals for measuring various stereoscopic display parameters.

Applications

IEC 62629-12-1:2014 is essential for quality assurance, research and development, and compliance testing of 3D stereoscopic display devices in multiple fields:

• Consumer Electronics: For manufacturers of 3D televisions, monitors, and projectors, the standard ensures reliable optical performance that affects consumer viewing experience.
• Professional Visualization: In areas such as medical imaging, CAD, and simulation, the standard aids in validating display accuracy and comfort when using stereoscopic glasses.
• Virtual Reality and Augmented Reality: Measurement of crosstalk, luminance, and viewing angle dependencies supports improved stereoscopic display performance embedded in VR/AR headsets and systems.
• Display Component Manufacturing: Glasses producers use the standard to characterize optical properties such as transmittance and extinction ratios, enabling optimization of active and passive 3D glasses.
• Certification & Compliance: Testing labs and regulatory bodies rely on these measuring methods for standardizing 3D display devices’ performance claims.

Related Standards

• IEC 62629 Series: The broader series dealing with 3D display devices, of which Part 12-1 focuses specifically on optical measurement methods for stereoscopic displays using glasses.
• IEC 61966 Series: Standards relating to color measurement and management, complementing the colorimetric methods specified in IEC 62629-12-1.
• ISO/IEC 13406: Guidelines for ergonomic and visual requirements for display devices that also address stereoscopic visualization factors.
• Other Optical Measurement Standards: Standards for LMDs (Light Measuring Devices) and photometric devices used in evaluating display performance.

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Keywords: IEC 62629-12-1, stereoscopic display measurement, 3D display devices, active shutter glasses, passive polarized glasses, optical measurement methods, interocular crosstalk, luminance uniformity, contrast ratio, color gamut, 3D glasses transmittance, stereoscopic display testing, IEC standards, 3D visualization quality.

Standards Content (Sample)

IEC 62629-12-1 ®
Edition 1.0 2014-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
3D Display devices –
Part 12-1: Measuring methods for stereoscopic displays using glasses – Optical

Dispositifs d'affichage 3D –
Partie 12-1: Méthodes de mesure pour les écrans stéréoscopiques utilisant des
lunettes – Optique
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IEC 62629-12-1 ®
Edition 1.0 2014-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
3D Display devices –
Part 12-1: Measuring methods for stereoscopic displays using glasses – Optical

Dispositifs d'affichage 3D –
Partie 12-1: Méthodes de mesure pour les écrans stéréoscopiques utilisant des

lunettes – Optique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XB
ICS 31.120; 31.260 ISBN 978-2-8322-1309-4

– 2 – 62629-12-1 © IEC:2014
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 10
4 Structure of measuring equipment . 12
5 Standard measuring conditions . 12
5.1 Environmental conditions . 12
5.2 Set-up conditions . 12
5.2.1 Measurement distance and viewing direction . 12
5.2.2 Measuring layouts . 12
5.2.3 Set-up conditions of stereoscopic display . 17
5.2.4 Glasses . 17
5.2.5 LMD (light measuring device) . 21
5.3 Input signals . 22
5.3.1 Signal format and field frequency of input video signal. 22
5.3.2 List of input signals . 22
5.4 Measuring points . 24
5.5 Warm-up condition of display modules and glasses . 24
5.6 Lighting conditions . 24
5.6.1 General . 24
5.6.2 Dark-room conditions . 24
5.7 List of input signals, measuring points and layout for each measuring
item . 25
6 Measuring methods for the pair of stereoscopic display and glasses . 25
6.1 General . 25
6.2 Luminance, luminance uniformity and interocular luminance difference . 26
6.2.1 Purpose . 26
6.2.2 Measuring equipment . 26
6.2.3 Measuring conditions . 26
6.2.4 Measuring procedure . 26
6.2.5 Measurement report. 27
6.3 Dark-room contrast ratio and interocular contrast difference . 28
6.3.1 General . 28
6.3.2 Measuring equipment . 28
6.3.3 Measuring conditions . 29
6.3.4 Input signal . 29
6.3.5 Measuring procedure . 29
6.3.6 Measurement report. 30
6.4 Colour gamut . 31
6.4.1 Purpose . 31
6.4.2 Measuring equipment . 31
6.4.3 Measurement . 31
6.5 White chromaticity, chromatic uniformity and interocular chromatic
difference . 32
6.5.1 Purpose . 32

62629-12-1 © IEC:2014 – 3 –
6.5.2 Measuring equipment . 32
6.5.3 Measurement . 32
6.6 Interocular crosstalk at screen centre. 33
6.6.1 General . 33
6.6.2 Measuring equipment . 34
6.6.3 Measuring conditions . 34
6.6.4 Selection of the method (selection of applied signals) . 34
6.6.5 Input signal . 34
6.6.6 Procedure for 4 % window method . 35
6.6.7 Procedure for full screen method . 35
6.6.8 Calculation of interocular crosstalk . 35
6.6.9 Measurement report. 36
6.7 Interocular crosstalk screen position dependency (interocular crosstalk
uniformity). 37
6.7.1 General . 37
6.7.2 Measuring equipment . 37
6.7.3 Measuring conditions . 37
6.7.4 Measuring layout . 38
6.7.5 Use of two-dimensional LMD . 38
6.7.6 Selection of the method (selection of applied signals) . 38
6.7.7 Input signal of full screen and 0,44 % windows methods . 38
6.7.8 Procedure using full screen or 0,44 % windows signals for a
two-dimensional LMD . 39
6.7.9 Procedure using full screen or 0,44 % windows signals with a
point-measurement LMD . 40
6.7.10 Measurement report. 40
6.8 Viewing direction dependency . 41
6.8.1 General . 41
6.8.2 Viewing direction (angle) . 41
6.8.3 Measuring item . 41
6.8.4 Measuring equipment . 41
6.8.5 Input signals . 42
6.8.6 Measuring conditions . 42
6.8.7 Measuring procedure . 42
6.8.8 Measurement report. 42
6.9 Characteristics depending on the in-plane rotation of the glass lens . 44
6.9.1 Purpose . 44
6.9.2 Measurement in-plane rotation . 44
6.9.3 Measuring item . 44
6.9.4 Measuring equipment . 44
6.9.5 Input signals . 44
6.9.6 Measuring conditions . 44
6.9.7 Measuring procedure . 44
6.9.8 Measurement report. 45
6.10 Characteristics depending on the tilt of the glass lens . 45
6.10.1 Purpose . 45
6.10.2 Measurement . 45
6.10.3 Measurement report. 45
6.11 Viewing distance dependency . 45
6.11.1 General . 45

– 4 – 62629-12-1 © IEC:2014
6.11.2 Measurement distance . 46
6.11.3 Measuring item . 46
6.11.4 Measuring equipment . 46
6.11.5 Input signals . 46
6.11.6 Measuring conditions . 46
6.11.7 Measuring procedure . 46
6.11.8 Measurement report. 47
7 Measuring methods for the glasses . 48
7.1 General . 48
7.2 Additional equipment for the measurement of glasses . 49
7.2.1 General . 49
7.2.2 Light source . 49
7.2.3 Polarizer . 49
7.2.4 Optical band pass filter . 49
7.2.5 Fast response light measuring device (fast response LMD) . 50
7.3 Measuring conditions of glasses . 50
7.3.1 General . 50
7.3.2 Designed centre of glass lens . 50
7.3.3 Standard measuring layout of glasses . 50
7.3.4 Driving conditions (frequency and open-close duty) of active
glasses . 51
7.3.5 Lighting condition . 52
7.3.6 Temperature conditions of glasses . 52
7.4 Transmittance at open and closed states, colour shift, extinction ratio,
interocular transmittance, interocular extinction ratio and interocular
chromaticity difference . 53
7.4.1 General . 53
7.4.2 Description of colour shift . 53
7.4.3 Measuring equipment . 53
7.4.4 Measuring conditions . 53
7.4.5 Measuring procedure . 53
7.5 Response time (open state to/from closed state) of active glasses . 59
7.5.1 General . 59
7.5.2 Measuring equipment . 60
7.5.3 Measuring conditions . 60
7.5.4 Measuring procedure . 60
7.5.5 Analysis of response time . 61
7.5.6 Measurement report. 62
7.6 Angular characteristic . 62
7.6.1 General . 62
7.6.2 Measuring item . 62
7.6.3 Measuring conditions . 62
7.6.4 Layout of the glasses . 62
7.6.5 Procedure . 63
7.6.6 Measurement report. 63
7.7 Temperature dependency . 63
7.7.1 General . 63
7.7.2 Measuring item . 63
7.7.3 Additional measuring equipment . 63

62629-12-1 © IEC:2014 – 5 –
7.7.4 Measuring conditions . 63
7.7.5 Layout of glasses . 63
7.7.6 Procedure . 63
7.7.7 Measurement report. 64
7.8 Lens uniformity . 64
7.8.1 General . 64
7.8.2 Measuring equipment . 64
7.8.3 Measuring conditions . 64
7.8.4 Measuring procedure . 65
Annex A (informative) Symbols . 67
Bibliography . 69

Figure 1 – Standard measuring layout (side view, centre point measurement) . 13
Figure 2 – Measuring layout for multi-point measurement with head-still (eye-turn)
condition (side view) . 14
Figure 3 – Measuring layout for multi-point measurement with head-turn (point-
observation) condition (side view) . 14
Figure 4 – Head-turn and head-still conditions (top views) . 15
Figure 5 – Measuring layout for designed viewing point (side view) . 15
Figure 6 – Measuring layout for horizontal viewing direction dependency . 16
Figure 7 – Measuring layout for vertical viewing direction dependency . 17
Figure 8 – Example of designed configuration of glasses . 18
Figure 9 – Position of glasses . 19
Figure 10 – In-plane rotation of glasses (front view) . 19
Figure 11 – Layout of glasses for larger aperture LMD . 20
Figure 12 – Example image in the view finder . 20
Figure 13 – Layout of glasses for larger aperture LMD for multi-point measurement
with head-still condition . 21
Figure 14 – Layout of glasses for larger aperture LMD for multi-point measurement
with head-turn condition . 21
Figure 15 – 4 % window . 23
Figure 16 – Offset 4 % window . 23
Figure 17 – Measuring points for the centre and multi-point measurement . 24
Figure 18 – Example measurement result of colour gamut . 32
Figure 19 – 0,44 % white windows at level 100 % for the measurement of interocular
crosstalk screen position dependency . 38
Figure 20 – Signals of 0,44 % white windows methods for interocular crosstalk screen
position dependency . 39
Figure 21 – Standard measuring layout of glasses . 51
Figure 22 – Some classification examples of stereoscopic displays using a polarizer . 51
Figure 23 – Standard driving timing chart for active glasses . 52
Figure 24 – Temperature chamber . 52
Figure 25 – Configuration of measurement for the response time of the glasses . 60
Figure 26 – Example of observed response waveform . 61
Figure 27 – Example analysis of response waveform . 61
Figure 28 – Measuring layout of lens uniformity using a point-measurement LMD . 65

– 6 – 62629-12-1 © IEC:2014
Figure 29 – Measuring layout of lens uniformity using a two-dimensional LMD . 65
Figure 30 – Measuring points of lens uniformity measurement . 65
Figure A.1 – Subscripts of symbols (example 1) . 67
Figure A.2 – Subscripts of symbols (example 2) . 67

Table 1 – List of input signals, measuring points and layout for each measuring item . 25
Table 2 – Example of measurement result for full screen white luminance, 4 % white
window luminance and luminance uniformity . 27
Table 3 – Example of full screen white luminance, 4 % white window luminance and
interocular luminance difference . 28
Table 4 – Example table of 4 % window dark-room contrast ratio and interocular
contrast difference . 31
Table 5 – Example of white chromaticity measurement result. 33
Table 6 – Example of measurement result of interocular crosstalk at screen centre . 37
Table 7 – Example of measurement summary of interocular crosstalk screen position
dependency for left view by 9-point measurement . 40
Table 8 – Example of measurement result for viewing direction dependency of full
screen white luminance, 4 % white window luminance, dark-room contrast ratio and
interocular crosstalk at screen centre . 43
Table 9 – Example of measurement result for viewing distance dependency . 48
Table 10 – Active glasses (1) . 58
Table 11 – Active glasses (2) . 58
Table 12 – Passive glasses with circular polarizer and linear polarizer (1) . 59
Table 13 – Passive glasses with circular polarizer and linear polarizer (2) . 59
Table 14 – Example result of response time measurement . 62
Table 15 – Example result of colour response time measurement . 62
Table A.1 – List of typical symbols . 68

62629-12-1 © IEC:2014 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
3D DISPLAY DEVICES –
Part 12-1: Measuring methods
for stereoscopic displays using glasses –
Optical
FOREWORD
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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.
International Standard IEC 62629-12-1 has been prepared by IEC technical committee 110:
Electronic display devices.
The text of this standard is based on the following documents:
FDIS Report on voting
110/524/FDIS 110/537/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 8 – 62629-12-1 © IEC:2014
A list of all the parts in the IEC 62629 series, under the general title 3D display devices, can
be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
62629-12-1 © IEC:2014 – 9 –
3D DISPLAY DEVICES –
Part 12-1: Measuring methods
for stereoscopic displays using glasses –
Optical
1 Scope
This part of IEC 62629 determines the following measuring methods for characterizing the
performance of stereoscopic display devices using either active or passive glasses.
This standard focuses on the types of stereoscopic displays using glasses as follows:
The types of stereoscopic displays reproducing temporally interlaced images and applicable
glasses are:
– displays representing temporally interlaced (high frame rate) images and active glasses
(time dividing shutter glasses), and
– displays with front screen switchable polarizer representing temporally interlaced images
and linear or circular polarizer passive glasses.
The types of stereoscopic displays reproducing spatially interlaced images and applicable
glasses are:
– displays with patterned retarder representing spatially interlaced images and linear or
circular polarizer passive glasses.
Some parts of these measuring methods may also be applied to other types of stereoscopic
displays using glasses not listed above.
The measuring items for the sets of stereoscopic display and glasses are as follows:
a) luminance,
b) luminance uniformity,
c) interocular luminous difference,
d) dark-room contrast ratio,
e) interocular contrast difference,
f) colour gamut,
g) white chromaticity,
h) white chromatic uniformity,
i) interocular chromatic difference,
j) interocular crosstalk, and
k) interocular crosstalk screen position dependency (interocular crosstalk uniformity).
The measuring parameters are as follows:
l) viewing direction dependency,
m) dependency on in-plane rotation of lens,
n) dependency on tilt angle of lens, and
o) viewing distance dependency.

– 10 – 62629-12-1 © IEC:2014
The measuring items for the glasses are as follows:
p) transmittance (open state),
q) extinction ratio,
r) colour shift (open state, on-state),
s) interocular transmittance,
t) interocular contrast difference,
u) interocular chromatic difference,
v) response time (open state to/from closed state) of active glasses, and
w) uniformity of lens.
The measuring parameters are as follows:
x) angular characteristic, and
y) temperature dependency.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60107-1, Methods of measurement on receivers for television broadcast transmissions –
Part 1: General considerations – Measurements at radio and video frequencies
IEC 62629-1-2, 3D display devices – Part 1-2: Generic – Terminology and letter symbols
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62629-1-2,
IEC 60068-1 and IEC 60107-1, as well as the following apply.
3.1
active glasses
glasses whose left and right lenses alternate their optical characteristics, synchronizing with
displayed time-sequential images on a stereoscopic display (e.g. synchronizing to TV fields,
TV frame, etc.) to separate the displayed images into left and right monocular views
Note 1 to entry: Usually left and right images are displayed alternately on a screen. When a left image is displayed,
the left lens of active glasses is turned on to transmit the image and the right lens is turned off to cut off the image.
The lenses need no function of focusing light.
3.2
closed state of glass lens
optical condition of a glass lens in the on-state of active glasses with the emitted left or right
light of a stereoscopic display at the minimum light transmittance (a low light transmittance
condition)
3.3
designed viewing distance
viewing distance recommended by the manufacturer of 3D display

62629-12-1 © IEC:2014 – 11 –
Note 1 to entry: Measurements in this document are usually carried out from the designed viewing distance.
3.4
extinction ratio of glass lens
ratio of the transmittance at open and closed conditions of a glass lens
Note 1 to entry: Two stacked linear polarizer sheets show the maximum transmittance when the polarization axes
are parallel and the minimum transmittance when they are orthogonal to each other.
3.5
glasses
eye attachment having a characteristic by which displayed images on a stereoscopic display
are divided into left and right parallax images
Note 1 to entry: In this document the term “glasses” means special glasses for stereoscopic views and the term
“ordinary glasses” is used for conventional glasses. See passive glasses and active glasses.
3.6
head-still condition
measurement configuration of glasses to measure some measuring points on a display screen,
where the position and the angle between the glasses and the screen are kept at constant
values and only the LMD (light measuring device) rotates and changes its position
Note 1 to entry: This condition simulates a whole screen observation at a glance or an area observation only using
eye movement.
3.7
head-turn condition
measurement configuration of the glasses to measure some measuring points on a display
screen, where the designed centre of the glasses is aligned to the optical axes of the LMD
Note 1 to entry: This condition simulates the point observation of some positions on a display screen or the area
observation on a display screen using head movement.
3.8
off-state of active glasses
powered-off (not in busy) state of active glasses, where both lenses of the glasses are at a
fixed light transmittance
Note 1 to entry: Typically, both lenses are set to the maximum light transmission (high transmittance condition).
3.9
on-state of active glasses
powered-on (in busy) state of active glasses, where each lens of the glasses is alternately
changing the conditions from open to closed and closed to open, synchronizing to the
displayed time-sequential images on a stereoscopic display
3.10
open state of glass lens
optical condition of a glass lens in the on-state of active glasses, at the maximum light
transmittance through the lens for either the left or right image of a stereoscopic display (high
light transmittance condition)
3.11
passive glasses
glasses whose left and right lenses have complementary but fixed optical characteristics to
separate displayed images on a stereoscopic display into left and right monocular views
Note 1 to entry: Usually spatially divided left and right segmental images are displayed at the same time on a
screen; each divided segment of the screen emits polarized light to display the images and the left and right
segments have an opposite orientation of polarization. The left lens of the passive glasses has a polarization to
pass the emitted light of the left images and to cut off that of the right images, while the right lens passes the right
images and cuts off the left images.

– 12 – 62629-12-1 © IEC:2014
4 Structure of measuring equipment
The system diagrams and/or driving conditions of the measuring equipment shall comply with
the structure specified in each item.
5 Standard measuring conditions
5.1 Environmental conditions
Measurements shall be carried out under the standard environmental conditions, e.g. at a
temperature of 25 °C ± 3 °C, a relative humidity of 45 % to 75 %, and a pressure of 86 kPa to
106 kPa. When different environmental conditions are used, these shall be noted in the report.
5.2 Set-up conditions
5.2.1 Measurement distance and viewing direction
5.2.1.1 General
The measurement distance  and viewing direction from the screen centre shall be the
M
standard measurement distance and the standard measurement direction; if not, a designed
viewing distance or a designed viewing direction is defined in the relevant specification. The
measurement distance and the viewing direction applied to the measurement shall be noted in
the report.
5.2.1.2 Standard measurement distance and direction
 is 3V, where V is the height of the active area. The
The standard measurement distance
M,S
standard measurement direction from the screen centre is perpendicular to the screen. When
a designed viewing distance is specified in the relevant specification, it shall be used as the
measurement distance.
5.2.1.3 Designed viewing distance and direction
A designed viewing distance can be defined in the relevant specification. Then the designed
viewing distance shall be applied and the designed measurement distance shall be noted in
the report.
A designed viewing direction can be defined in the relevant specification. Then the viewing
direction shall be applied and the viewing direction shall be noted in the report.
5.2.2 Measuring layouts
5.2.2.1 Standard measuring layout for a stereoscopic display and glasses
Measurements shall be carried out at the standard measuring layout; if not, a designed
viewing distance or a designed viewing direction is defined in the relevant specification. The
standard measuring layout is shown in Figure 1, Figure 2 and Figure 3, for a centre point
measurement, a multi-point measurement with the head-still condition and a multi-point
measurement with the head-turn condition, respectively. Figure 1, Figure 2 and Figure 3 are
side views and show the vertical alignments of the layouts. The horizontal alignments are
defined similarly. The configurations of the lens of the glasses and the light measuring device
(LMD) in these multi-point measurements are shown in Figure 4. The aperture of the LMD
shall be set at the observing point. The lens of the glasses shall be set at the front of the
object lens of the LMD and parallel or at the designed direction to the object lens.
The use of the measuring layout shown in Figure 1, Figure 2 or Figure 3 is defined in each
measuring item. When a measuring layout is required for some measuring items in the

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relevant specification, the required layout shall be used
...