ISO/IEC 21118:2020
(Main)Information technology — Office equipment — Information to be included in specification sheets for data projectors
Information technology — Office equipment — Information to be included in specification sheets for data projectors
This document specifies the information to be included in the specification sheets for front projection type data projectors and the form of specification sheets. This document is not applicable to units for a rear screen projection.
Technologies de l'information — Équipements de bureau — Information à inclure dans les feuilles de spécifications pour projecteurs de données
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INTERNATIONAL ISO/IEC
STANDARD 21118
Third edition
2020-02
Information technology — Office
equipment — Information to be
included in specification sheets for
data projectors
Technologies de l'information — Équipements de bureau —
Information à inclure dans les feuilles de spécifications pour
projecteurs de données
Reference number
©
ISO/IEC 2020
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measuring methods and conditions . 3
5 Items in specification sheets . 4
Annex A (normative) Specification sheets . 9
Annex B (normative) Measuring methods and conditions .11
Bibliography .23
© ISO/IEC 2020 – All rights reserved iii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that
are members of ISO or IEC participate in the development of International Standards through
technical committees established by the respective organization to deal with particular fields of
technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with ISO and IEC, also
take part in the work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents) or the IEC
list of patent declarations received (see http:// patents .iec .ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 28, Office equipment.
This third edition cancels and replaces the second edition (ISO/IEC 21118:2012), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— progress of light source technologies (from lamp to laser, LED, etc.);
— diversification of input/output signals (HDMI, display port, HDBase-T, etc.);
— move toward higher resolution (4K, 8K, pixel shift technology, etc.);
— description of colour quality (colour gamut ratio).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO/IEC 2020 – All rights reserved
INTERNATIONAL STANDARD ISO/IEC 21118:2020(E)
Information technology — Office equipment —
Information to be included in specification sheets for data
projectors
1 Scope
This document specifies the information to be included in the specification sheets for front projection
type data projectors and the form of specification sheets.
This document is not applicable to units for a rear screen projection.
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.
ISO 7779:2018, Acoustics — Measurement of airborne noise emitted by information technology and
telecommunications equipment
ISO 11201, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions in an essentially free field over a reflecting
plane with negligible environmental corrections
IEC 60107-2:1997, Methods of measurement on receivers for television broadcast transmissions — Part 2:
Audio channels — General methods and methods for monophonic channels
IEC 61947-1, Electronic projection — Measurement and documentation of key performance criteria —
Part 1: Fixed resolution projectors
3 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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
data projector
display equipment that converts electrical signals containing image information from automatic data
processing machines into optical signals and projects onto a projection screen
3.2
light valve
light-modulation device (such as a transmissive or reflective liquid crystal display, or a micro
mirror device) used to create an optical image from an external light source that corresponds to an
electrical signal
3.3
wide-angle end
minimum focal length position of the zoom lens
© ISO/IEC 2020 – All rights reserved 1
3.4
lens shift
projecting function which is vertical or horizontal repositioning of the projection lens relative to the
light valve (3.2) to compensate for projector to screen alignment differences
3.5
image position
presentation of shifts of projected image on horizontal and vertical directions
Note 1 to entry: It is calculated as per Formulae (1) and (2):
X = (X - X ) / W × 100 % (1)
shift cpi axis pi
Y = (Y - Y ) / H × 100 % (2)
shift cpi axis pi
where
X , Y are the horizontal and vertical image shift ratios;
shift shift
X , Y are x and y coordinates of P (X , Y ) (as shown in Figure 1), the centre of the project-
cpi cpi cpi cpi cpi
ed image;
X , Y are x and y coordinates of P (X , Y ) (as shown in Figure 1), the point at which the axis
axis axis axis axis axis
of the projection lens intersects the screen;
W , H are the overall width and height of the projected image.
pi pi
Note 2 to entry: The horizontal image shift ratio is positive when P is at the right of P , and negative when
cpi axis
P is at the left of P .
cpi axis
Note 3 to entry: The vertical image shift ratio is positive when P is above P , and negative when P is
cpi axis cpi
below P .
axis
2 © ISO/IEC 2020 – All rights reserved
Key
1 projection lens
a
Axis of projection lens.
b
Projected image.
c
Centre of projected image; P (X , Y ).
cpi cpi cpi
d
Intersection of axis of projection lens and surface of projected image; P (X , Y ).
axis axis axis
e
Horizontal image shift.
f
Vertical image shift.
Figure 1 — Shifted image position
3.6
projection distance
distance between the projector and the screen measured in linear units (i.e. metres, feet, or inches)
Note 1 to entry: This distance is considered to be the distance from the image displayed on the screen to the
outermost element of the projection lens.
[SOURCE: IEC 61947-1:2002, 3.29]
3.7
rear screen projection
projection with image projected through a light-transmitting screen to the audience side of the screen
[SOURCE: IEC 61947-1:2002, 3.30]
3.8
standard outside dimensions
maximum dimensions of the product after removing the packaging, including any protrusions
4 Measuring methods and conditions
The measuring methods and conditions in terms of the performance specification items in Table 1 shall
be in accordance with Annex B.
© ISO/IEC 2020 – All rights reserved 3
5 Items in specification sheets
Table 1 lists the items that shall appear in the specification sheets. Items whose properties shall be
included in the specification sheets are marked as “R” (required), while other items whose properties
are given for information are marked as “O” (optional).
Values in the specification of light output, contrast ratio (full white/full black) and centre to corner
zone ratio shall be defined as averages of productions. The lower-limit values of the product at the time
of shipment shall be at least 80 % of the values in specification sheets for these three items.
The specification sheets shall have a statement indicating accordance with this document. The
terminology shown in the “Item” column of Table 1 shall be used in the specification sheets. Items
marked as optional may be omitted, along with any items that do not apply to the particular projector
model. If an item is omitted; the order of items included in the specification sheets shall maintain the
same order as shown in Table 1.
The form of the specification sheets shall be as given in Annex A.
NOTE The term “specification sheets” applies to documents which describe the performance characteristics
of the data projector which can be included in instruction manuals, product catalogues or on websites.
Table 1 — Performance specification items
No. Item R/O Item specification Description example
1 Product number, type R The product name, type name, model —
name, or model number numbers, or product numbers shall be
indicated.
2 Display system R The light valve type and the display sys- a) LCD, micro mirror,
tem shall be indicated. other
b) transmitting,
reflecting
c) single display device, 3
display devices, other
3 Optical system O The optics for colour separation and a) dichroic mirror
convergence should be indicated. separation-prism
convergence system
b) time sharing
separation/
convergence system
c) other
4 Display device
4.1 Size of effective display R Diagonal size, number of display device 33 mm × 3 / 1,3 in × 3,
area and aspect ratio shall be indicated. aspect ratio 4 : 3
4.2 Number of pixels R Pixel count per display device and pixel 786 432 pixels
dimensions shall be indicated. (1 024 × 768)
1 024 000 pixels
(1 280 × 800)
O Pixel count per projected image inclosing 2 211 840 pixels
enhanced pixel number and such tech- (2 048 × 1 080)
nology should be indicated. by pixel shift
4.3 Other O Additional features of the display device
should be indicated.
5 Projection lens
"R" in the R/O column means required items and "O" means optional items.
4 © ISO/IEC 2020 – All rights reserved
Table 1 (continued)
No. Item R/O Item specification Description example
5.1 Zoom R Zoom magnifications shall be indicated. Power zoom (1,4 ×)
5.2 Focus R Method of focus adjustment shall be Manual or powered
indicated.
5.3 Lens shift O Image position, fixed/variable, manual/ Fixed lens shift: xx (%)
powered should be indicated.
Vertical lens shift range,
Indicate lens shift range, fixed/variable
XX %(up) - XX %(down)
type and manual/powered.
XX %(right) - XX %(left)
Range of single vertical lens shift may be
described as "Lens shift XX % to XX %"
(see 3.5)
Image position for fixed lens shift.
Image position for variable shift.
In case an optical axis position is una-
vailable, an illustration may be used.
5.4 Focal length O - f = 52 mm — 73 mm
f/number f / 2,5 — 2,9
5.5 Changeable lens O If the projection lens can be changed, it Yes or no
should be indicated.
6 Light source R Light source type shall be indicated. Lamp, laser diode, LED,
other
If the light source type is a lamp, the
lamp type, wattage and quantity shall be high pressure mercury
indicated. lamp, 300 W, × 2
7 Life expectancy of light O The time when light source output 20 000 h at normal mode
Source halves should be indicated.
In the case of lamp, see IEC 61947-1.
Other case of light source, driving se-
que
...
INTERNATIONAL ISO/IEC
STANDARD 21118
Third edition
2020-02
Information technology — Office
equipment — Information to be
included in specification sheets for
data projectors
Technologies de l'information — Équipements de bureau —
Information à inclure dans les feuilles de spécifications pour
projecteurs de données
Reference number
©
ISO/IEC 2020
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measuring methods and conditions . 3
5 Items in specification sheets . 4
Annex A (normative) Specification sheets . 9
Annex B (normative) Measuring methods and conditions .11
Bibliography .23
© ISO/IEC 2020 – All rights reserved iii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that
are members of ISO or IEC participate in the development of International Standards through
technical committees established by the respective organization to deal with particular fields of
technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with ISO and IEC, also
take part in the work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents) or the IEC
list of patent declarations received (see http:// patents .iec .ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 28, Office equipment.
This third edition cancels and replaces the second edition (ISO/IEC 21118:2012), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— progress of light source technologies (from lamp to laser, LED, etc.);
— diversification of input/output signals (HDMI, display port, HDBase-T, etc.);
— move toward higher resolution (4K, 8K, pixel shift technology, etc.);
— description of colour quality (colour gamut ratio).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO/IEC 2020 – All rights reserved
INTERNATIONAL STANDARD ISO/IEC 21118:2020(E)
Information technology — Office equipment —
Information to be included in specification sheets for data
projectors
1 Scope
This document specifies the information to be included in the specification sheets for front projection
type data projectors and the form of specification sheets.
This document is not applicable to units for a rear screen projection.
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.
ISO 7779:2018, Acoustics — Measurement of airborne noise emitted by information technology and
telecommunications equipment
ISO 11201, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions in an essentially free field over a reflecting
plane with negligible environmental corrections
IEC 60107-2:1997, Methods of measurement on receivers for television broadcast transmissions — Part 2:
Audio channels — General methods and methods for monophonic channels
IEC 61947-1, Electronic projection — Measurement and documentation of key performance criteria —
Part 1: Fixed resolution projectors
3 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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
data projector
display equipment that converts electrical signals containing image information from automatic data
processing machines into optical signals and projects onto a projection screen
3.2
light valve
light-modulation device (such as a transmissive or reflective liquid crystal display, or a micro
mirror device) used to create an optical image from an external light source that corresponds to an
electrical signal
3.3
wide-angle end
minimum focal length position of the zoom lens
© ISO/IEC 2020 – All rights reserved 1
3.4
lens shift
projecting function which is vertical or horizontal repositioning of the projection lens relative to the
light valve (3.2) to compensate for projector to screen alignment differences
3.5
image position
presentation of shifts of projected image on horizontal and vertical directions
Note 1 to entry: It is calculated as per Formulae (1) and (2):
X = (X - X ) / W × 100 % (1)
shift cpi axis pi
Y = (Y - Y ) / H × 100 % (2)
shift cpi axis pi
where
X , Y are the horizontal and vertical image shift ratios;
shift shift
X , Y are x and y coordinates of P (X , Y ) (as shown in Figure 1), the centre of the project-
cpi cpi cpi cpi cpi
ed image;
X , Y are x and y coordinates of P (X , Y ) (as shown in Figure 1), the point at which the axis
axis axis axis axis axis
of the projection lens intersects the screen;
W , H are the overall width and height of the projected image.
pi pi
Note 2 to entry: The horizontal image shift ratio is positive when P is at the right of P , and negative when
cpi axis
P is at the left of P .
cpi axis
Note 3 to entry: The vertical image shift ratio is positive when P is above P , and negative when P is
cpi axis cpi
below P .
axis
2 © ISO/IEC 2020 – All rights reserved
Key
1 projection lens
a
Axis of projection lens.
b
Projected image.
c
Centre of projected image; P (X , Y ).
cpi cpi cpi
d
Intersection of axis of projection lens and surface of projected image; P (X , Y ).
axis axis axis
e
Horizontal image shift.
f
Vertical image shift.
Figure 1 — Shifted image position
3.6
projection distance
distance between the projector and the screen measured in linear units (i.e. metres, feet, or inches)
Note 1 to entry: This distance is considered to be the distance from the image displayed on the screen to the
outermost element of the projection lens.
[SOURCE: IEC 61947-1:2002, 3.29]
3.7
rear screen projection
projection with image projected through a light-transmitting screen to the audience side of the screen
[SOURCE: IEC 61947-1:2002, 3.30]
3.8
standard outside dimensions
maximum dimensions of the product after removing the packaging, including any protrusions
4 Measuring methods and conditions
The measuring methods and conditions in terms of the performance specification items in Table 1 shall
be in accordance with Annex B.
© ISO/IEC 2020 – All rights reserved 3
5 Items in specification sheets
Table 1 lists the items that shall appear in the specification sheets. Items whose properties shall be
included in the specification sheets are marked as “R” (required), while other items whose properties
are given for information are marked as “O” (optional).
Values in the specification of light output, contrast ratio (full white/full black) and centre to corner
zone ratio shall be defined as averages of productions. The lower-limit values of the product at the time
of shipment shall be at least 80 % of the values in specification sheets for these three items.
The specification sheets shall have a statement indicating accordance with this document. The
terminology shown in the “Item” column of Table 1 shall be used in the specification sheets. Items
marked as optional may be omitted, along with any items that do not apply to the particular projector
model. If an item is omitted; the order of items included in the specification sheets shall maintain the
same order as shown in Table 1.
The form of the specification sheets shall be as given in Annex A.
NOTE The term “specification sheets” applies to documents which describe the performance characteristics
of the data projector which can be included in instruction manuals, product catalogues or on websites.
Table 1 — Performance specification items
No. Item R/O Item specification Description example
1 Product number, type R The product name, type name, model —
name, or model number numbers, or product numbers shall be
indicated.
2 Display system R The light valve type and the display sys- a) LCD, micro mirror,
tem shall be indicated. other
b) transmitting,
reflecting
c) single display device, 3
display devices, other
3 Optical system O The optics for colour separation and a) dichroic mirror
convergence should be indicated. separation-prism
convergence system
b) time sharing
separation/
convergence system
c) other
4 Display device
4.1 Size of effective display R Diagonal size, number of display device 33 mm × 3 / 1,3 in × 3,
area and aspect ratio shall be indicated. aspect ratio 4 : 3
4.2 Number of pixels R Pixel count per display device and pixel 786 432 pixels
dimensions shall be indicated. (1 024 × 768)
1 024 000 pixels
(1 280 × 800)
O Pixel count per projected image inclosing 2 211 840 pixels
enhanced pixel number and such tech- (2 048 × 1 080)
nology should be indicated. by pixel shift
4.3 Other O Additional features of the display device
should be indicated.
5 Projection lens
"R" in the R/O column means required items and "O" means optional items.
4 © ISO/IEC 2020 – All rights reserved
Table 1 (continued)
No. Item R/O Item specification Description example
5.1 Zoom R Zoom magnifications shall be indicated. Power zoom (1,4 ×)
5.2 Focus R Method of focus adjustment shall be Manual or powered
indicated.
5.3 Lens shift O Image position, fixed/variable, manual/ Fixed lens shift: xx (%)
powered should be indicated.
Vertical lens shift range,
Indicate lens shift range, fixed/variable
XX %(up) - XX %(down)
type and manual/powered.
XX %(right) - XX %(left)
Range of single vertical lens shift may be
described as "Lens shift XX % to XX %"
(see 3.5)
Image position for fixed lens shift.
Image position for variable shift.
In case an optical axis position is una-
vailable, an illustration may be used.
5.4 Focal length O - f = 52 mm — 73 mm
f/number f / 2,5 — 2,9
5.5 Changeable lens O If the projection lens can be changed, it Yes or no
should be indicated.
6 Light source R Light source type shall be indicated. Lamp, laser diode, LED,
other
If the light source type is a lamp, the
lamp type, wattage and quantity shall be high pressure mercury
indicated. lamp, 300 W, × 2
7 Life expectancy of light O The time when light source output 20 000 h at normal mode
Source halves should be indicated.
In the case of lamp, see IEC 61947-1.
Other case of light source, driving se-
que
...
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