IEC 61747-30-3:2019

IEC 61747-30-3 ®
Edition 1.0 2019-08
INTERNATIONAL
STANDARD
colour
inside
Liquid crystal display devices –
Part 30-3: Measuring methods for liquid crystal display modules – Motion
artefact measurement of active matrix liquid crystal display modules
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IEC 61747-30-3 ®
Edition 1.0 2019-08
INTERNATIONAL
STANDARD
colour
inside
Liquid crystal display devices –

Part 30-3: Measuring methods for liquid crystal display modules – Motion

artefact measurement of active matrix liquid crystal display modules

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120 ISBN 978-2-8322-7262-6

– 2 – IEC 61747-30-3:2019 © IEC 2019
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 . 8
5 Standard motion blur measuring methods . 8
5.1 General . 8
5.2 Direct measurement method . 8
5.2.1 Standard measuring process . 8
5.2.2 Analysis method . 12
5.3 Indirect measurement method . 15
5.3.1 Temporal step response . 15
5.3.2 High speed camera . 17
6 Test report . 18
6.1 General . 18
6.2 Items to be reported . 18
Annex A (informative) Subjective test method . 20
Annex B (informative) Motion contrast degradation . 21
B.1 General . 21
B.2 Direct measurement . 21
B.3 Indirect measurement . 22
Annex C (informative) Dynamic modulation transfer function . 23
Bibliography . 25

Figure 1 – Examples of edge blur test pattern . 8
Figure 2 – Example of a pivoting pursuit camera system . 9
Figure 3 – Example of a linear pursuit camera system . 9
Figure 4 – Measurement regions for landscape orientation . 10
Figure 5 – Measurement regions for portrait orientation . 11
Figure 6 – Example of luminance cross-section profile of blurred edge time . 12
Figure 7 – Example of luminance cross-section profile of extended blurred edge time . 13
Figure 8 – PBET calculation . 13
Figure 9 – Set-up to measure the temporal step response . 15
Figure 10 – Example of an LC response time measurement . 16
Figure 11 – Example of a motion picture response curve derived from the response
measurement presented in Figure 10 and a convolution with a one-frame-wide window
function . 17
Figure 12 – Example of measurement data reporting . 19
Figure B.1 – Example of motion contrast degradation test pattern . 21

Figure B.2 – Example of motion contrast degradation due to line spreading . 22
Figure C.1 – Example of motion contrast degradation . 23
Figure C.2 – Example of DMTF properties for different motion speeds (V) . 24

Table 1 – Step response data for different luminance transitions . 11

– 4 – IEC 61747-30-3:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIQUID CRYSTAL DISPLAY DEVICES –

Part 30-3: Measuring methods for liquid crystal display modules –
Motion artefact measurement of
active matrix liquid crystal display modules

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
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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.
International Standard IEC 61747-30-3 has been prepared by IEC technical committee 110:
Electronic displays.
This first edition cancels and replaces the first edition of IEC 61747-6-3 published in 2011.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) added test positions and areas;
b) revised standard measuring conditions;
c) added calculation of the standard deviation of the line-spread function of the eye;
d) added requirements for high speed camera;

e) changed “LCDs” to “transmissive TFT LCDs” in Clause 1.
The text of this International Standard is based on the following documents:
FDIS Report on voting
110/1103/FDIS 110/1130/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
A list of all parts in the IEC 61747 series, published under the general title Liquid crystal
display devices, can be found on the IEC website.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.

– 6 – IEC 61747-30-3:2019 © IEC 2019
LIQUID CRYSTAL DISPLAY DEVICES –

Part 30-3: Measuring methods for liquid crystal display modules –
Motion artefact measurement of
active matrix liquid crystal display modules

1 Scope
This part of IEC 61747 applies to transmissive type active matrix liquid crystal displays.
This document defines general procedures for quality evaluation related to the motion
performance of transmissive thin film transistor (TFT) LCDs. It defines artefacts in the moving
image and methods for motion artefact measurement.
NOTE Motion blur measurement methods and analysis methods introduced in this document are not universal
tools for all the different LCD motion enhancement technologies due to their complexity. Users’ attention is drawn
to this fact.
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 61747-30-1, Liquid crystal display devices – Part 30-1: Measuring methods for liquid
crystal display modules – Transmissive type
ISO 11664-4, Colourimetry – Part 4: CIE 1976 L*a*b* Colour space
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions 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
NOTE In this document, the term “pixel” is adopted as the unit of the signal resolution. That is, the horizontal and
vertical pixel pitch (size) of the DUT is determined based on the spatial distance displayed (scrolled) on the screen
corresponding to the inputted signal pixel regardless of the display pixel types.
3.1.1
motion picture response curve
curve representing the convolution of the temporal step response with a moving window
function one-frame wide
Note 1 to entry: It shows how the luminance is integrated over time during smooth pursuit eye tracking and
combines the effects of the LCD response time and the hold-type characteristics of the device under test.

3.1.2
motion induced edge profile
luminance profile of an intrinsically sharp moving luminance transition when this transition is
followed with smooth pursuit eye tracking along its motion trajectory
Note 1 to entry: The profile can be calculated from the motion picture response curve for any given motion speed.
3.1.3
edge blur
blur that becomes visible on an intrinsically sharp transition between two adjacent areas, with
a different luminance level, when the transition smoothly moves across the display as a
function of time
Note 1 to entry: Preconditions for this type of edge blur are smooth pursuit eye tracking of the object and no
obvious flicker, indicating that luminance integration with a frame period is allowed. This blur phenomenon is
mainly caused by a slow response time of the liquid crystal cell in combination with the hold-type characteristics.
3.1.4
perceived blurred edge time
time-related equivalent of the perceived blurred edge width
Note 1 to entry: The perceived blurred edge width is derived from the motion induced edge profile by means of
filtering the edge profile with the contrast sensitivity function of the human eye.
3.2 Abbreviated terms
BET blurred edge time
BEW blurred edge width
CCD charge-coupled device
CIE Commission Internationale de l’Eclairage (International Commission on
Illumination)
CMOS complimentary metal-oxide semiconductor
CSF contrast sensitivity function
DMTF dynamic modulation transfer function
DUT display under test
DVI digital visual interface
EBET extended blurred edge time
FFT fast Fourier transform
IEC International Electrotechnical Commission
ISO International Organization for Standardization
JND just-noticeable difference
LCD liquid crystal display
LMD light measuring device
LVDS low-voltage differential signaling
MCD motion contrast degradation
MPRC motion picture response curve
MPRT moving picture response time
MTF modulation transfer function
PBET perceived blurred edge time
PBEW perceived blurred edge width
TFT thin film transistor
TN-LCD twisted nematic liquid crystal display
VA-LCD vertically-aligned liquid crystal display

– 8 – IEC 61747-30-3:2019 © IEC 2019
4 Standard measuring conditions
Measurements shall be carried out under standard environmental conditions:
– temperature: 25 ºC ± 3 ºC;
– relative humidity: 25 % RH to 85 % RH;
– atmospheric pressure: 86 kPa to 106 kPa.
All visual inspection tests shall be tested at 25 °C ± 3 °C.
When different environmental conditions are used, they shall be noted in the measurement
report.
The illuminance at the measuring spot of the DUT shall be below 1 lx (standard dark room
conditions as defined in IEC 61747-30-1).
5 Standard motion blur measuring methods
5.1 General
Motion induced object blur is the result of a slow response of the liquid crystal cells and a
stationary representation of the temporal image (related to the hold time of the display), in
combination with smooth pursuit eye tracking of an object over the display surface. When an
object moves across the display and the eye is tracking this object, a spatiotemporal
integration of the object luminance is taking place at the human retina. There are several
ways to measure and characterize this spatiotemporal integration: via a direct measurement
or via an indirect measurement technique. For direct measurement, a pursuit camera system
can be used; the indirect measurement is based on measuring the temporal response curves,
and from those curves the motion induced object blur that will occur on the retina can be
calculated. Both direct and indirect measurements will be described in this document.
Possible alternatives to direct measurement are described in Annex A, Annex B and Annex C.
5.2 Direct measurement method
5.2.1 Standard measuring process
5.2.1.1 Test patterns
There are several patterns that can be used to measure motion induced object blur, such as a
full test pattern, box test pattern, and line bar test pattern (see Figure 1). The details of the
used test pattern(s) shall be reported. When using a pursuit system, the width of the test
pattern should be sufficiently wide, for example five times the advancement (step-width) per
frame, to capture the total temporal response of the display. It is recommended that a
minimum of seven gray shades, including black and white, be used for the gray level of each
part of a test pattern in Figure 1. The lightness function L*, specified in ISO 11664-4, shall be
used to space the intermediate gray shades equally on the lightness scale.

a) Full test pattern b) Box test pattern c) Line bar test pattern
Figure 1 – Examples of edge blur test pattern

NOTE LCD input data for gray levels can be obtained by first measuring luminance as a function of input level, i.e.
a gray tone-rendering curve, and selecting the input values corresponding most closely to equidistant L* values.
5.2.1.2 Pursuit detection system
Measuring the edge blur of the LCD module should be done by using a CCD or CMOS camera
with the pursuit measurement system shown in Figure 2 and Figure 3. Relevant literature on
these systems can be found in [1] to [5], [17], [22] .

Figure 2 – Example of a pivoting pursuit camera system

Figure 3 – Example of a linear pursuit camera system

______________
Numbers in square brackets refer to the Bibliography.

– 10 – IEC 61747-30-3:2019 © IEC 2019
The following elements are recommended when implementing the pursuit measuring system:
a) LMD: CCD or CMOS type surface measurement devices (CCD camera), with preferably an
integrated CIE 1931 photopic luminous sensitivity function (measuring luminance).
b) Scroll speed: the scroll speed of the test pattern and the pursuing speed of the LMD are
synchronized accurately to prevent integration errors. Pursuit speed error can be verified
by the method in [22]
c) Pursuing system: a pivoting or linear pursuit system as shown in Figure 2 and Figure 3,
respectively. The angular rotation is limited to avoid viewing angle–related dependencies
(less than ± 5˚).
5.2.1.3 Test position
Since the measurement results of motion blur can be dependent on the measurement position
on the display depending on the scanning direction as well as the use of backlight behaviour
(scanning backlight/modulation), measurements shall be taken on multiple positions according
to Figure 4.
The measurements are taken inside boxes centred on the measurement positions, with a
length of H/5 and a height of V/20.

Figure 4 – Measurement regions for landscape orientation
On displays where the (line) scan direction does not coincide with the ve
...