IEC 62629-22-1:2016
(Main)3D display devices - Part 22-1: Measuring methods for autostereoscopic displays - Optical
3D display devices - Part 22-1: Measuring methods for autostereoscopic displays - Optical
IEC 62629-22-1:2016(E) specifies optical measuring methods for autostereoscopic display devices. It defines general measuring procedures for optical characteristics of two-view and multi-view displays and integral imaging displays. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of offset crosstalk and 3D pixel crosstalk as 3D crosstalk related property.
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IEC 62629-22-1 ®
Edition 2.0 2016-10
INTERNATIONAL
STANDARD
3D display devices –
Part 22-1: Measuring methods for autostereoscopic displays – Optical
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IEC 62629-22-1 ®
Edition 2.0 2016-10
INTERNATIONAL
STANDARD
3D display devices –
Part 22-1: Measuring methods for autostereoscopic displays – Optical
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120; 31.260 ISBN 978-2-8322-3688-8
– 2 – IEC 62629-22-1:2016 © IEC 2016
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 . 7
4 Standard measuring conditions . 8
4.1 Standard environmental conditions . 8
4.1.1 Temperature, humidity and pressure conditions . 8
4.1.2 Illumination conditions . 8
4.2 Light measuring device . 8
4.2.1 General . 8
4.2.2 Aperture size . 9
4.3 Measuring setup . 9
4.3.1 Designed viewing distance . 9
4.3.2 Measurement area . 10
4.3.3 Measuring layout . 10
4.4 Test signal . 12
4.5 Standard measuring points . 13
5 Measuring method for two-view and multi-view displays . 14
5.1 Maximum luminance direction . 14
5.1.1 General . 14
5.1.2 Measuring equipment . 14
5.1.3 Measuring conditions . 15
5.1.4 Measuring procedure . 15
5.1.5 Measurement report . 15
5.2 Lobe angle and lobe angle variation on screen . 16
5.2.1 General . 16
5.2.2 Measuring equipment . 16
5.2.3 Measuring conditions . 16
5.2.4 Measuring procedure . 17
5.2.5 Measurement report . 17
5.3 Luminance, screen luminance uniformity, and angular luminance variation . 18
5.3.1 Luminance and screen luminance uniformity . 18
5.3.2 Angular luminance variation . 19
5.4 White chromaticity, white chromaticity uniformity on screen, and white
chromaticity variation in angle . 20
5.4.1 White chromaticity and white chromaticity uniformity on screen . 20
5.4.2 White chromaticity angular variation . 22
6 Standard measuring method for integral imaging displays (1D/2D) . 23
6.1 General . 23
6.2 Lobe angle and lobe angle variation on screen . 24
6.3 Luminance, screen luminance uniformity, and angular luminance variation . 24
6.3.1 Luminance and screen luminance uniformity . 24
6.3.2 Angular luminance variation . 24
6.4 White chromaticity, white chromaticity uniformity on screen, and white
chromaticity variation in angle . 24
6.4.1 White chromaticity and white chromaticity uniformity on screen . 24
6.4.2 White chromaticity variation in angle . 24
7 Measuring method for 3D crosstalk related property . 24
7.1 3D crosstalk (luminance components ratio), 3D crosstalk variation on screen,
and 3D crosstalk variation in angle for two-view and multi-view displays . 24
7.1.1 3D crosstalk (luminance components ratio) and 3D crosstalk variation
on screen . 24
7.1.2 3D crosstalk angular variation . 27
7.2 3D crosstalk related property for multi-view display . 28
7.2.1 General . 28
7.2.2 Offset crosstalk . 28
7.2.3 3D pixel crosstalk . 30
Annex A (informative) Principle of autostereoscopic display . 35
A.1 General . 35
A.2 Two-view display . 35
A.3 Multi-view display . 36
A.4 Integral imaging display . 37
Annex B (informative) Angular profile of luminance . 39
Annex C (informative) 3D crosstalk based on one inter-pupil distance . 40
C.1 General . 40
C.2 Measuring equipment . 41
C.3 Measuring conditions . 41
C.4 Measuring procedure . 41
C.5 Measuring report . 41
Annex D (informative) View density for motion parallax smoothness . 44
D.1 General . 44
D.2 Measuring equipment . 44
D.3 Measuring conditions . 44
D.4 Measuring procedure . 44
D.5 Measuring report . 44
Bibliography . 46
Figure 1 – Measuring system . 9
Figure 2 – Measuring layout for centre point measurement . 10
Figure 3 – Measuring layout for multi-point measurement (side view). 11
Figure 4 – Other measuring layout for multi-point measurement (side view) . 11
Figure 5 – Measuring layout for horizontal viewing direction dependency . 12
Figure 6 – Measuring layout for vertical viewing direction dependency . 12
Figure 7 – Two examples of the relation between pixel and lenslet in multi-view display . 13
Figure 8 – Measuring points for the centre and multi-point measurement . 14
Figure 9 – Example of n by m measuring points . 14
Figure 10 – Example of measurement results for angular luminance profile . 16
Figure 11 – Example of lobe angle measurement . 17
Figure 12 – Example of 3D crosstalk variation on screen . 25
Figure 13 – Example of acquired images in multi-view display . 25
– 4 – IEC 62629-22-1:2016 © IEC 2016
Figure 14 – Spatial luminance data acquisition (left) and example of calculated spatial
crosstalk graph (right) . 26
Figure 15 – Example of minimum luminance and maximum luminance for offset
crosstalk . 29
Figure 16 – Example of adjacent overlap . 30
Figure 17 – Example of slanted lens configuration where 4,688 sub-pixels in a row are
covered in one lens pitch . 31
Figure 18 – Measuring layout example for 3D pixel crosstalk for multi-view displays
having dozens of perspective output images . 32
Figure 19 – Example of luminance angular profile for a multi-view display having 28
views (perspective images) . 33
Figure A.1 – Structure of two-view display . 35
Figure A.2 – Basic principle of two-view display . 36
Figure A.3 – Structure of multi-view display . 36
Figure A.4 – Basic principle of multi-view display . 37
Figure A.5 – Basic principle of integral imaging display . 37
Figure B.1 – Example of angular profile of luminance. 39
Figure C.1 – Example image of a traditional multi-view display . 40
Figure C.2 – Example image of the multi-view display having at least one view within
one IPD . 40
Figure C.3 – Example of luminance angular profile for a multi-view display having at
least one view within one IPD (at designed viewing distance = 3,878 m) . 42
Table 1 – Example of reported specification of two-dimensional LMD . 9
Table 2 – Example of measurement results for maximum luminance direction . 16
Table 3 – Example of measurement results for lobe angle variation on screen . 18
Table 4 – Example of measurement results for luminance and screen luminance non-
uniformity . 19
Table 5 – Example of measurement results for angular luminance variation . 20
Table 6 – Example of measurement results for white chromaticity and white
chromaticity uniformity on screen . 22
Table 7 – Example of measurement results for white chromaticity variation in angle . 23
Table 8 – Example of measurement results for 3D crosstalk variation on screen . 27
Table 9 – Example of measurement results for 3D crosstalk angular variation . 28
Table 10 – Example of measurement results for offset crosstalk . 30
Table 11 – Example of 3D pixel crosstalk calculation results . 34
Table B.1 – Example of measurement results . 39
Table C.1 – Example of measurement results for 3D crosstalk based on one IPD . 43
Table D.1 – Example of measurement results for motion parallax smoothness . 45
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
3D DISPLAY DEVICES –
Part 22-1: Measuring methods for autostereoscopic displays – Optical
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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 62629-22-1 has been prepared by IEC technical committee 110:
Electronic display devices.
This second edition cancels and replaces the first edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of offset crosstalk and 3D pixel crosstalk as 3D crosstalk related property.
– 6 – IEC 62629-22-1:2016 © IEC 2016
The text of this standard is based on the following documents:
FDIS Report on voting
110/784/FDIS 110/797/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.
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 website 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.
A bilingual version of this publication may be issued at a later date.
3D DISPLAY DEVICES –
Part 22-1: Measuring methods for autostereoscopic displays – Optical
1 Scope
This part of IEC 62629-22 specifies optical measuring methods for autostereoscopic display
devices. It defines general measuring procedures for optical characteristics of two-view and
multi-view displays and integral imaging displays.
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 62629-1-2, 3D display devices – Part 1-2: Generic – Terminology and letter symbols
ISO/CIE 19476, Characterization of the performance of illuminance meters and luminance
meters
CIE 15:2004, Colorimetry
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62629-1-2 and the
following 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
3.1.1
3D pixel crosstalk
pixel crosstalk by horizontal pixels for one lens pitch
3.2 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply.
CCD charge-coupled device
DVD designed viewing distance
FPD flat panel display
FWHM full width half maximum
FWTQM full width at three-quarter maximum
IPD inter pupil distance
– 8 – IEC 62629-22-1:2016 © IEC 2016
LMD light measuring device
4 Standard measuring conditions
4.1 Standard environmental conditions
4.1.1 Temperature, humidity and pressure conditions
Standard environmental conditions shall be applied for the measurements of autostereoscopic
display devices.
The standard environmental conditions for the measurements of autostereoscopic display
devices are (25 ± 5) °C temperature, 45 % to 75 % relative humidity, and 86 kPa to 106 kPa
pressure.
4.1.2 Illumination conditions
Standard dark room conditions shall be applied.
In standard dark room conditions, the illuminance at any position on the screen (the display
device screen) is below 0,3 lx in all directions.
NOTE Illuminance is measured without the measured display or in conditions where the display is turned off.
4.2 Light measuring device
4.2.1 General
The LMD used for measurements of the displays shall be checked for the following criteria
and specified accordingly:
• aperture size (window function of LMD) (see 4.2.2);
• sensitivity of the measured quantity;
• errors caused by veiling glare and lens flare (i.e. stray light in optical system);
• timing of data acquisition, low-pass filtering and aliasing effects;
• linearity of detection and data-conversion;
• resolution and moiré when using a two-dimensional LMD.
A point-measurement LMD, such as a spot luminance meter, or a two-dimensional LMD such
as a CCD area detector, shall be used for these measurements. A conoscopic type LMD can
be used for some measurements. When a two-dimensional LMD and/or a conoscopic type
LMD is/are used, they shall be calibrated so that the measurement results correspond to
those of the point-measurement LMD. The specification of the LMD used shall be noted in the
report as in the example shown in Table 1.
NOTE 1 The point-measurement LMD measures the luminance and/or colour coordinate at each measurement
point on the screen. A two-dimensional LMD measures the map of luminance and/or colour coordinate over the
measurement area of the screen. A conoscopic type LMD measures the directional characteristics of luminance
and/or colour coordinate at each measurement point on the screen.
NOTE 2 A point-measurement LMD usually has higher sensitivity than a two-dimensional LMD. A two-dimensional
LMD measures the uniformity of the measuring area more easily than a point-measurement LMD.
Table 1 – Example of reported specification of two-dimensional LMD
CCD resolution
4 096 × 2 048
CCD A/D dynamic range More than 12 bits = 4 096 gray scale levels
Wavelength range 380 nm to 780 nm
System accuracy Luminance variation ± 3 %
CIE 1931 chromaticity coordinates (x, y)
± 0,003
Colorimetric filters CIE 1931 colour matching functions for a 2° observer
4.2.2 Aperture size
The aperture size (entrance pupil, see ISO/CIE 19476) of an LMD, including point-
measurement and two-dimensional type LMDs (smaller than the size of the object lens of the
LMD), shall be equal to or smaller than 8 mm. When a larger aperture LMD is used, the
measurement results shall be checked so that the results are equivalent to those of the
smaller aperture LMD. The aperture size shall be reported by the supplier (the manufacturer
of the 3D display device) in the relevant specification.
NOTE In the measurement of autostereoscopic displays, the aperture size of the LMD greatly affects the
measurement results. So the LMD aperture size is defined in this document. The aperture size similar to the size of
the pupil of an eye is ideal for the measurements (e.g. crosstalk), but a smaller aperture decreases the sensitivity.
The size of 8 mm is small enough for the measurement and large enough for the sensitivity. The exact value of the
aperture size of the LMD used will be informed by the LMD supplier. The relation among the aperture size,
measuring area size and measuring distance is shown in Figure 1 and explained in 4.3. When a larger aperture
LMD is used, the measuring distance is increased as long as the measuring distance does not affect the
measurement results by changing the measuring distance.
Measurement area
Aperture area
(measurement field)
(acceptance area)
Measurement area angle
(measurement field angle)
Angular aperture
LMD
Measuring distance
Screen
IEC
Figure 1 – Measuring system
4.3 Measuring setup
4.3.1 Designed viewing distance
A DVD shall be defined by the supplier in the relevant specification. The DVD is the distance
from which proper stereoscopic views are intended to be observed and/or the characteristics
of an autostereoscopic display are measured accurately.
For the measurements, the designed viewing distance shall be applied as the measuring
distance. The measuring distance shall be fixed when items planned to be evaluated are
– 10 – IEC 62629-22-1:2016 © IEC 2016
measured. Only one designed viewing distance shall be defined and applied to an
autostereoscopic display device.
4.3.2 Measurement area
The LMD shall be set at a proper measurement area angle (measurement field angle, see
Figure 1) less than or equal to 2°, and shall have a measurement area of at least 500 pixels
whose diameter is less than 10 % of the screen height. This area corresponds to having a
circular measurement area of at least 26 lines in diameter when the screen has a square pixel
consisting of 3 subpixels. If the above conditions cannot be applied, the applied measurement
area shall include as many pixels as possible. The applied measuring conditions shall be
noted in the report.
NOTE Based on the information given by the supplier, such as number of views and lobe angle, the measurement
field angle, aperture angle and measuring distance are determined. The aperture angle is small so that the angular
luminance profile can be measured precisely. In general, the more the number of views increases, the smaller the
required aperture angle is. In theory, when a smaller aperture is applied, a smaller field angle is desirable. In
addition, some autostereoscopic displays are designed so that the screen produces different distribution of light
rays to improve 3D observation. When considering these points, the field angle is introduced. The range of
measuring distance is decided by the size of the aperture and measurement field. The measuring distance and the
field angle are adjusted to achieve a viewing area greater than 500 pixels, whose diameter is less than 10 % of the
screen height, if it is difficult to set the field angle above.
4.3.3 Measuring layout
4.3.3.1 Centre point measurement
The measuring layout for a centre point measurement is shown in Figure 2. The aperture of
the LMD shall be set at the designed viewing distance.
Screen
Screen
LMD
LMD
Screen centre
Centre line
Measuring distance
Measuring distance
IEC
IEC
a) Side view b) Top view
Figure 2 – Measuring layout for centre point measurement
4.3.3.2 Multi-point measurement
The measuring layout for a multi-point measurement is shown in Figure 3. When a multi-point
measurement is carried out using the two-dimensional LMD, the measuring layout shown in
Figure 2 shall be applied. In this case the measurement result shall be confirmed to be the
same as that measured by the multi-point measurement shown in Figure 3.
Measuring point
LMD
Screen centre
Tilt (and rotation)
Centre line
Screen
Measuring distance
IEC
NOTE A similar layout is applied to the measurement with rotation.
Figure 3 – Measuring layout for multi-point measurement (side view)
The measuring layout shown in Figure 4 can also be applied to certain measuring items. This
layout is suitable for certain measuring items where the display does not strongly depend on
LMD positions (i.e. integral imaging display). The layout used for the measurement shall be
noted in the report. When a different measuring layout is used, this shall be noted in the
report.
LMD
Measuring point
Screen centre
Centre line
Screen
Measuring distance
IEC
Figure 4 – Other measuring layout for multi-point measurement (side view)
4.3.3.3 Measurement of viewing direction dependency
To measure viewing direction dependency, the characteristics at the centre of the screen are
measured from the vertical or horizontal viewing directions defined in each measurement
method or relevant specification, as shown in Figure 5 and Figure 6. Instead of moving the
LMD, the autostereoscopic display can be tilted vertically or turned horizontally to be
measured as shown in Figure 5 b) and Figure 6 b). The horizontal and vertical measuring
angular ranges and angular scanning steps shall be defined by the supplier in the relevant
specification, and shall be noted in the report.
– 12 – IEC 62629-22-1:2016 © IEC 2016
Screen
Screen
θ
H
θ
H
Measuring
LMD
distance
Measuring distance
LMD
IEC
IEC
a) Movement of LMD (top view) b) Rotation of display (top view)
Figure 5 – Measuring layout for horizontal viewing direction dependency
LMD
Screen
Screen
Measuring distance
LMD
θ Screen centre
θ
Screen centre
Measuring distance
IEC IEC
a) Movement of LMD (side view) b) Tilt of display (side view)
Figure 6 – Measuring layout for vertical viewing direction dependency
4.4 Test signal
th
The all-pixel white signal, all-pixel black signal, and i -pixel white signal are defined below:
a) Im : all-pixel white signal (at 100 % level) or all-pixel white
all white
NOTE 1 The all-pixel white signal denotes that all pixels on the screen are activated by the input of level
100 %.
b) Im : all-pixel black signal (at 0 % level) or all-pixel black
all black
NOTE 2 The all-pixel black signal denotes that all pixels on the screen are suppressed by the input of level
0 %.
th th
c) Im : i -pixel white signal (at 100 % level) with the other pixel blackened or i -pixel
i
white,where i is 1 to N (see Figure 7) and N is the number of views (multi views). For
th
temporal use, the i light ray white signal (at 100 % level) with the other light rays
th
blackened or the i light ray white can be used.
th th
NOTE 3 The i pixel white signal indicates that only i pixels in the group are activated by the input of 100 %
level.
NOTE 4 Light ray is explained in Annex A.
th
The signal details of signals for the i -pixel white signal, or the details of the pixels and
lenslet as shown in Figure 7 shall be described by the supplier in the relevant specification.
th
st
N pixel (the left end
1 pixel (the right
in the group)
end in the group)
Group pixels attached
Group pixels
to a lenslet
attached to a lenslet
Screen
Screen
Lens sheet
Lenslet
th
N light rays
st
1 light rays
Light direction
Light direction
IEC
IEC
st th
Key : pixel at level 100 %, : pixel at level 0 %, Im and Im are 1 and N pixel white signals
1 N
a) Test image (Im ) b) Test image (Im )
1 N
st
NOTE As shown in a), every pixel at the right end in the group (every 1 pixel) is at level 100 %, and as shown in
th
b), so is every pixel on the left end in the group (every N pixel).
Figure 7 – Two examples of the relation between pixel
and lenslet in multi-view display
4.5 Standard measuring points
The centre point (one-point) and multi-point (three-point, five-point or nine-point)
measurements are applied. The measuring points are shown in Figure 8. The measuring point
of one-point measurement is named P . In multi-point measurements the three points are P ,
0 0
P and P , the five points and nine points are from P to P and from P to P , respectively.
6 8 0 4 0 8
The n by m points for 3D crosstalk variation on screen are shown in Figure 9. The applied
number of measuring points (n by m) shall be defined by the supplier in the relevant
specification.
The applied measuring points are defined in each measurement item. If other measuring
points are applied, this shall be defined by the supplier in the relevant specification.
NOTE One-point measurement is carried out to obtain the typical characteristics at the centre of the screen.
Others are carried out to obtain deviations, averages and uniformities.
– 14 – IEC 62629-22-1:2016 © IEC 2016
H/2
P P P
1 5 2
P P P
8 0 6
P P P
4 7 3
H/10
H
IEC
NOTE V is the short side width of the screen (usually screen height). H is the long side width of the screen
(usually screen width). P , P , P , P , P , P , P , P and P show the measuring points.
0 1 2 3 4 5 6 7 8
Figure 8 – Measuring points for the centre and multi-point measurement
P(1, 1) P(1, m)
H/10
m
…
P(n, 1)
…
H P(n,m)
IEC
NOTE V is the short side width of the screen (usually screen height). H is the long side width of the screen
(usually screen width). P(a,b), where a = 1 to n and b = 1 to m, show the measuring points.
Figure 9 – Example of n by m measuring points
5 Measuring method for two-view and multi-view displays
5.1 Maximum luminance direction
5.1.1 General
The purpose of this measurement is to measure the angular luminance profile and to obtain a
maximum luminance direction. The maximum luminance direction is calculated as an angular
position where the luminance is the highest on the angular luminance profile.
5.1.2 Measuring equipment
The following equipment shall be used:
V/10
V/2
n
…
…
V/10
V
V
a) driving power source;
b) driving signal equipment; and
c) LMD.
5.1.3 Measuring conditions
The following detailed conditions shall be applied:
th
a) test signal: i -pixel white (see 4.4);
b) measuring point: centre point (see Figure 2);
c) measuring angular range: the supplier specifies the measuring angular range and the
measuring angular scanning step (see Figure 5);
d) measuring distance: designed viewing distance (see 4.3.1).
5.1.4 Measuring procedure
The following measuring procedure shall be carried out:
a) after warming up the display, apply the test signal Im ;
b) measure the angular luminance profile at each selected angle and record the luminance
values;
c) change the test signal, and repeat b) until all tests (test signals Im to Im ) are carried out.
1 N
5.1.5 Measurement report
The measurement report shall include the following:
a) plot the angular luminance profiles as shown in Figure 10;
b) report the angular position of each maximum luminance θ (Im) in a table. Table 2
Lmax i
shows an example.
The angular position of each maximum luminance θ (Im ) is the angle of each maximum
Lmax i
luminance value of the closest peak from the perpendicular of the display.
When the angular luminance profile does not show a clear peak, the center of FWHM can be
applied (see Annex B).
– 16 – IEC 62629-22-1:2016 © IEC 2016
Angular luminance profile (Im )
i
L (Im )
max i
θ (Im ) Angle
Lmax i
IEC
Key
L (Im ): maximum luminance of the angular luminance profile (Im )
max i i
θ (Im ): angular position of L (Im )
Lmax i max i
Figure 10 – Example of measurement results for angular luminance profile
Table 2 – Example of measurement results for maximum luminance direction
Test signal θ (Im )
Lmax i
degree
Im
–12,2
Im –8,6
Im –4,5
5.2 Lobe angle and lobe angle variation on screen
5.2.1 General
The purpose of this measurement is to measure the lobe angle and lobe angle variation on
screen.
NOTE 1 In general, autostereoscopic displays form the group of pixels corresponding to each lens/slit. The light
rays from each pixel group form a lobe. When the light rays go through the corresponding lens/slit, they form the
main lobe, or side lobes in other cases. On the boundary of the lobes, pseudostereoscopy or image breaking is
perceived. A wider lobe angle can reduce these phenomena.
NOTE 2 In this document, the term “lobe” means the bundle of light rays emitted from each pixel group going
through the corresponding lens/slit. However, note that the term “lobe” is sometimes used with a different meaning.
5.2.2 Measuring equipment
The following equipment shall be used:
a) driving power source;
b) driving signal equipment; and
c) LMD.
5.2.3 Measuring conditions
The following detailed conditions shall be applied:
Luminance
st th
a) test signal: 1 pixel white and N pixel white are applied (see 4.4);
b) measuring points: the multi-point measurements are applied (see Figure 8). The applied
number of measuring points (nine points) shall be noted in the report. Three-point
measurement may be used, when it is enough for characterization;
c) measuring directions: the supplier specifies measuring directions;
d) measuring distance: designed viewing distance (see 4.3.1).
5.2.4 Measuring procedure
The following measuring procedure shall be carried out:
a) after warming up the display, apply the test signals for Im ;
b) measure the angular luminance profile at each selected angle at each selected point and
record the luminance values;
c) change the test signal to Im , and repeat b).
N
5.2.5 Measurement report
The following measurement report shall be written:
a) at each measuring point, plot the angular luminance profiles;
b) find the maximum luminance angles θ (Im ) and θ (Im ) of the lm and lm
aLmax 1 aLmax N 1 N
profiles of each measuring point P (see Figure 10), and then calculate the lobe angle
a
θ (see Figure 11)
aLA
θ = |θ (Im ) – θ (Im ) |
aLA aLmax 1 aLmax N
where
th
θ (Im ) is the maximum luminance angle of lm of i ray at the measuring point P ;
aLmax i i a
c) report the angles in a table. Table 3 shows an example.
NOTE This measurement can be applied not only to the main lobe, but also to side lobes.
Angular luminance profile (Im )
θ
i
aLA
θ (Im ) θ (Im ) Angle
Lmax 1 Lmax 4
IEC
Figure 11 – Example of lobe angle measurement
Luminance
– 18 – IEC 62629-22-1:2016 © IEC 2016
Table 3 – Example of measurement results for lobe angle variation on screen
θ (Im ) θ (Im ) θ
aLmax 1 aLmax N aLA
Measuring point
degree
degree degree
P -15,2 15,4 30,6
P -15,3 15,2 30,5
P -15,0 15,4 30,4
P -15,5 15,0 30,5
P -15,7 14,8 30,5
P -14,8 15,8 30,6
P -15,2 15,6 30,8
P -15,7 14,6 30,3
P -14,7 15,5 30,2
5.3 Luminance, screen luminance uniformity, and angular luminance variation
5.3.1 Luminance and screen luminance uniformity
5.3.1.1 General
The purpose of this measurement is to measure the luminance and luminance uniformity of
the screen. The measurement of screen luminance uniformity is related to luminance moiré
due to the structure of autostereoscopic displays. Low-frequency moiré can be observed as
screen non-uniformity. When luminance moiré occurs, luminance uniformity will be degraded.
5.3.1.2 Measuring equipment
The following equipment shall be used:
a) driving power source;
b) driving signal equipment; and
c) LMD.
5.3.1.3 Measuring conditions
The following detailed conditions shall be applied:
a) test signal: all-pixel whites are applied (see 4.4);
...
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