IEC 62908-42-10:2025

IEC 62908-42-10 ®
Edition 1.0 2025-03
INTERNATIONAL
STANDARD
Touch and interactive displays –
Part 42-10: Measurement methods of motion-tracking image-control response
time for interactive projection display

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IEC 62908-42-10 ®
Edition 1.0 2025-03
INTERNATIONAL
STANDARD
Touch and interactive displays –

Part 42-10: Measurement methods of motion-tracking image-control response

time for interactive projection display

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120  ISBN 978-2-8327-0300-7

– 2 – IEC 62908-42-10:2025 © IEC 2025
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviated terms and symbols . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms. 8
3.3 Symbols . 8
4 Principle . 8
5 Standard measuring conditions . 9
5.1 General . 9
5.2 Standard measuring environmental conditions . 9
5.3 Standard measuring dark-room conditions . 9
5.4 Standard DUT conditions . 9
5.5 Standard light measuring device (LMD) requirements . 9
6 Standard measurement setup and coordinate system . 10
6.1 General . 10
6.2 Measurement setup . 10
6.3 Measurement coordinate system . 11
7 Measurement range . 12
8 Measurement methods . 12
8.1 General . 12
8.2 Response time measurement for the motion of the first object . 12
8.3 Response time measurement for the motion of the second object . 14
8.4 Response envelope waveform for the first or second object . 16
8.5 Response time measurement for the motion of the third object . 17
8.6 Response waveform for detecting the third object intrusion . 19
8.7 High-speed response time measurement . 19
8.8 High-speed measurement for raster-scanning laser projection display . 20
9 Report . 22
Annex A (informative) Example of response waveforms . 23
A.1 Example of the high-speed oscilloscope output for raster-scanning RGB
laser projection display. 23
A.2 Example of the high-speed oscilloscope output for a full-frame projection
display . 24
Annex B (informative) Example of projection patterns for measuring response time of
motions . 26
Annex C (informative) Examples of motion-tracking systems . 27
Bibliography . 29

Figure 1 – Categorization of motion . 10
Figure 2 – Measurement setup . 11
Figure 3 – Coordinate system related to the motion of the first and the second objects . 11
Figure 4 – Coordinate system related to the third object . 12
Figure 5 – Initial state before the motion of the first object . 13

Figure 6 – Motion status of the first object . 13
Figure 7 – Response detection status for the first object . 14
Figure 8 – Initial state before the motion of the second object . 15
Figure 9 – Motion status of the second object . 15
Figure 10 – Response detection status for the second object . 16
Figure 11 – Response envelope waveform displayed on oscilloscope for a small white
pattern on the dark background. 17
Figure 12 – Response envelope waveform displayed on oscilloscope for a small black
pattern on the white background . 17
Figure 13 – Initial state before the motion of the third object . 18
Figure 14 – Motion status of the third object . 18
Figure 15 – Response detection status for the motion of the third object . 19
Figure 16 – Response waveform displayed on oscilloscope when a black third object
enters the sensing range . 19
Figure 17 – Example of high-speed oscilloscope output of a pulse train repeating with
a period of the frame rate of a raster-scanning RGB laser projector . 20
Figure 18 – Example of high-speed oscilloscope output for measuring the response
time of a raster-scanning RGB laser projector when a small white pattern on the black
background disappears by a motion and then is controlled to reappear . 21
Figure 19 – Example of high-speed oscilloscope output for measuring the response
time of a raster-scanning RGB laser projector when a small black pattern on the white
background disappears by a motion and then is controlled to reappear . 21
Figure 20 – Example of higher-speed measurement using multiple PDs for raster-
scanning RGB laser projector . 22
Figure A.1 – Setup for measuring the PD output signal when the combined RGB laser
beams (white) is scanned across the PD . 23
Figure A.2 – Example of high-speed oscilloscope output when a PD detected the
scanning laser beams . 24
Figure A.3 – Example of measured response time displayed on a high-speed
oscilloscope for a raster-scanning laser projection display . 24
Figure A.4 – Example of measured response waveform including the PWM pulse
sequence for a full-frame projector . 25
Figure B.1 – Examples of the projection patterns for measuring the response time of
the motions of the first and the second objects . 26
Figure C.1 – Scanning angle of the LiDAR used in Figure C.2 . 27
Figure C.2 – Example of actual photo image (a) and the LiDAR 3D image data (b) . 28

Table 1 – Letter symbols . 8

– 4 – IEC 62908-42-10:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TOUCH AND INTERACTIVE DISPLAYS –

Part 42-10: Measurement methods of motion-tracking image-control
response time for interactive projection display

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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shall not be held responsible for identifying any or all such patent rights.
IEC 62908-42-10 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
110/1729/FDIS 110/1744/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.

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 62908 series, published under the general title Touch and interactive
displays, 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, or
• revised.
– 6 – IEC 62908-42-10:2025 © IEC 2025
INTRODUCTION
Projection displays have a configuration allowing for the freedom of motion of both the first and
the second objects and the third object(s) in the space between them. That is, the projection
displays can interactively track the motions of the first, second, or third object using sensing
devices such as a camera, a light detection and ranging (LiDAR) system, etc. As a result, the
interactive projection displays with the motion-tracking system create new applications, such
as image projection (projection mapping) from moving objects (e.g. vehicles, drones), projection
mapping onto moving objects (e.g. dancers), interactive image control by human motions, or
protecting a human body moving into a region of high-intensity light exposure from
photobiological damage. Hence, quick shut-down systems are important for ensuring safety,
and for smooth tracking of projection mapping onto moving objects.
Therefore, response time (latency) of the motion-tracking image control system is a key
performance indicator of the above interactive projection displays. Some advanced systems
can track various complicated motions. However, this document provides fundamental
measurement methods for measuring the response time of the motion-tracking image control
systems, in which the image is controlled according to simple motions. The measurements can
be carried out simply using small pattens, photodiodes (PD), and a high-speed oscilloscope.
The complicated motions specific to the advanced systems are not included in this document.
They are categorized as specific measurements for the customized specifications.
There are various types of projection display, such as full-frame projectors using a lamp, LEDs,
hybrid phosphor laser, or RGB lasers as light sources, raster-scanning RGB laser projectors,
etc. [1] , [2], [3]. This document is applicable to such various projection displays which can
interactively control the image via motion-tracking sensors.
The measurement methods in this document are commonly applicable to full-frame and
scanning projectors.
___________
Numbers in square brackets refer to the Bibliography.

TOUCH AND INTERACTIVE DISPLAYS –

Part 42-10: Measurement methods of motion-tracking image-control
response time for interactive projection display

1 Scope
This part of IEC 62908 specifies standard measurement conditions and fundamental
measurement methods of response time of interactive projection displays with sensors
detecting the motion of the projector, the projected image on the object, or the third objects,
interactively controlling the projection image responding to the motions.
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 60825-1, Safety of laser products – Part 1: Equipment classification and requirements
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
IEC 62908-1-2, Touch and interactive displays – Part 1-2: Generic – Terminology and letter
symbols
3 Terms, definitions, abbreviated terms and symbols
For the purposes of this document, the terms and definitions given in IEC 62906-1-2,
IEC 62908-1-2 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 Terms and definitions
3.1.1
first object
interactive projection display
projector part projecting images on second object (3.1.2), which has a motion-tracking image-
control system (3.1.4)
3.1.2
second object
screen part including a living form, on which images are projected by the first object (projector
part)
– 8 – IEC 62908-42-10:2025 © IEC 2025
3.1.3
third object
part including living forms existing or intruding into the space between the first object (3.1.1)
and the second object (3.1.2)
3.1.4
motion-tracking image-control system
feedback system loaded on the first object (3.1.1), projecting images on the second object
(3.1.2), which has a function of controlling the images projected on the second object or the
light emission of the first object (3.1.1), corresponding to the motion of the first object, the
second object, or the third object(s) in the space between the first and the second objects which
is detected by motion sensors equipped with the first object
3.2 Abbreviated terms
ADC analogue-to-digital converter
DUT device under test
LED light emitting diode
LiDAR light detection and ranging
LMD light measuring device
PD photodiode
PWM pulse width modulation
RGB red, green, blue
SLM spatial light modulator
TOF time
...