IEC 61747-4:2012

IEC 61747-4 ®
Edition 2.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Liquid crystal display devices –
Part 4: Liquid crystal display modules and cells – Essential ratings and
characteristics
Dispositifs d’affichage à cristaux liquides –
Partie 4: Modules et cellules d’affichage à cristaux liquides – Valeurs limites et
caractéristiques essentielles
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IEC 61747-4 ®
Edition 2.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Liquid crystal display devices –

Part 4: Liquid crystal display modules and cells – Essential ratings and

characteristics
Dispositifs d’affichage à cristaux liquides –

Partie 4: Modules et cellules d’affichage à cristaux liquides – Valeurs limites et

caractéristiques essentielles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX K
ICS 31.120 ISBN 978-2-83220-352-1

– 2 – 61747-4 © IEC:2012
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Liquid crystal display modules . 5
3.1 Principles and material used. 5
3.2 Modes of operation . 5
3.3 Details of outline . 5
3.4 Limiting values (absolute maximum rating system) over the operating
temperature range, unless otherwise stated . 6
3.5 Electrical and optical characteristics . 6
3.6 Supplementary information . 7
4 Liquid crystal display cells (LCD cells) . 8
4.1 Principle and material used . 8
4.2 Modes of operation . 8
4.3 Details of outline . 8
4.4 Limiting values (absolute maximum rating system) over the operating
temperature range, unless otherwise stated . 8
4.5 Electrical and optical characteristics . 9
4.6 Supplementary information . 9

Table 1 – Electrical and optical characteristics of LCD modules . 6
Table 2 – Electrical and optical characteristics of LCD cells . 9

61747-4 © IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LIQUID CRYSTAL DISPLAY DEVICES –

Part 4: Liquid crystal display modules and cells –
Essential ratings and characteristics

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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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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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 61747-4 has been prepared by IEC technical committee 110:
Electronic display devices.
This second edition cancels and replaces the first edition published in 1998. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– 2.1 and 3.1 of IEC 61747-4:1998 were deleted because these items are defined in
IEC 61747-1;
– 2.7.6, in 2.7, Supplementary information, of IEC 61747-4:1998 was deleted because the
scope of this standard is about passive matrix monochrome liquid crystal display modules;
– The item “Gray scale: digital or analog” in 2.3.1 of IEC 61747-4:1998 was changed to
“Gray scale: number” because it is more accurate;

– 4 – 61747-4 © IEC:2012
– Contrast mode: light symbol on dark background (“LOD” or “positive image”) or dark
symbol on light background (“DOL” or “negative image”) was introduced in this part of
IEC 61747 to replace the description in 2.3.1 and 3.3.1 of IEC 61747-4:1998.
The text of this standard is based on the following documents:
CDV Report on voting
110/349/CDV 110/393/RVC
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.
This International Standard is to be used in conjunction with IEC 61747-1:1998 and its
Amendment 1 (2003).
A list of all the parts in the IEC 61747 series, published under the general title Liquid crystal
display devices, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
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.
61747-4 © IEC:2012 – 5 –
LIQUID CRYSTAL DISPLAY DEVICES –

Part 4: Liquid crystal display modules and cells –
Essential ratings and characteristics

1 Scope
This part of IEC 61747 describes the essential ratings and characteristics of LCD cells and
passive matrix monochrome liquid crystal display modules.
It does not apply to active matrix LCD cells nor to multicolour cells.
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 61747-1:1998, Liquid crystal and solid-state display devices – Part 1: Generic
specification
3 Liquid crystal display modules
3.1 Principles and material used
Example: a TN display cell with electronic circuits and connector pins.
Where appropriate, a type of light source.
3.2 Modes of operation
3.2.1 Optical mode of operation
– illumination mode: for example reflective, transmissive, transflective
– gray scale: number
– contrast mode: light symbol on dark background (“LOD” or “positive image”) or dark
symbol on light background (“DOL” or “negative image”)
3.2.2 Electrical mode of operation
– example: static mode or multiplex mode, etc.
3.3 Details of outline
3.3.1 Material, mechanical description
– examples: glass, plastic, metal, etc.
– construction: for example integrated backlight, bezel structure
3.3.2 Method of connection
– connector, flex cable or connection pins, etc.

– 6 – 61747-4 © IEC:2012
3.3.3 Outline drawing and dimensions
– overall dimensions
– viewing area and display centre
3.3.4 Pinout table and/or connection diagram
– type of connectors
3.3.5 Preferred or designed viewing direction
3.4 Limiting values (absolute maximum rating system) over the operating
temperature range, unless otherwise stated
3.4.1 Minimum and maximum operating temperature (T )
op
3.4.2 Minimum and maximum storage temperature (T )
stg
3.4.3 Minimum and maximum value of supply voltages for logic and LCD drive (V -V ，
DD SS
V -V ，V -V ，V -V ，V -V )
DD EE EE SS O SS DD O
3.4.4 Minimum and maximum value of input signal voltage (V )
IN
3.4.5 Where appropriate, maximum value of backlight voltage (V )
BL
3.4.6 Where appropriate, maximum soldering temperature (T )
sld
– maximum soldering time and minimum distance to module package should be specified
3.5 Electrical and optical characteristics
The following parameters should be specified in Table 1.
Table 1 – Electrical and optical characteristics of LCD modules
Reference Characteristics Condition at T = 25 °C Symbol Requirements
op
unless otherwise
specified
V -V
Supply voltage for logic drive
DD SS
Supply voltage for LCD drive V -V
DD EE
3.5.1 V -V Min. Max.
EE SS
V -V
O SS
V -V
DD O
Input signal voltages V
IN
3.5.2 High level input signal voltage V Min. Max.
IH
Low level input signal voltage V
IL
Backlight voltages (where
3.5.3  V Min. Max.
BL
appropriate)
Operating frequency
f
op
(where appropriate)
f
3.5.4  Min. Max.
FRM
Frame frequency
f
OSC
Oscillator frequency
Conditions chosen to
I
tot
achieve maximum supply
3.5.5 Supply currents (without backlight) current, e.g. operating I and/or Max.
DD
supply voltage, display
I
pattern, etc., as appropriate EE

61747-4 © IEC:2012 – 7 –
Reference Characteristics Condition at T = 25 °C Symbol Requirements
op
unless otherwise
specified
High level input signal current
3.5.6  I Max.
IH
(where appropriate)
Low level input signal current
3.5.7  I Max.
IL
(where appropriate)
Operating backlight current
3.5.8  I Max.
BL
(where appropriate)
When the module has a
backlight system, this
CR
Contrast ratio system shall be used at a diff
3.5.9 Min.
(diffused light and/or direct beam) specified level during the
CR
dir
contrast ratio
measurements
Luminance Specified measuring
L
3.5.10 Min.
(where appropriate) method and conditions
θ
Specified definition of
V
viewing direction and
3.5.11 Viewing angle range and Min. Max.
specified
contrast ratio
θ
H
3.5.12 Turn-on time Specified temperature t Max.
on
t
3.5.13 Turn-off time Specified temperature  Max.
off
τ and/or
r
Transmittance (regular and/or Specified measuring
3.5.14 Min.
diffuse) (where appropriate) method and conditions
τ
d
ρ and/or
Reflectance (regular and/or Specified measuring r
3.5.15 Min. Max.
diffuse) (where appropriate) method and conditions
ρ
d
3.6 Supplementary information
(To be given only as far as necessary for the specification and use of the device.)
3.6.1 Angular dependence of contrast ratio
3.6.2 Switching times versus temperature
3.6.3 Timing characteristics and timing of logic voltages
3.6.4 Supply voltages sequence condition, where appropriate
3.6.5 Operating voltage range, if appropriate, as a function of temperature at specified
contrast ratio
3.6.6 Handling and operating information
3.6.7 Precautions with respect to electrostatic discharges
3.6.8 Precautions of installation: mechanical and/or electrical
3.6.9 Safety information
3.6.10 Characterization of diffuse and specular reflectance and transmittance

– 8 – 61747-4 © IEC:2012
4 Liquid crystal display cells (LCD cells)
4.1 Principle and material used
Example: twisted nematic cell
4.2 Modes of operation
4.2.1 Optical mode of operation
– illumination mode: for example reflective, transmissive, transflective
– contrast mode: light symbol on dark background (“LOD” or “positive image”) or dark
symbol on light background (“DOL” or “negative image”)
4.2.2 Electrical mode of operation
Static mode or multiplex mode
4.3 Details of outline
4.3.1 Mechanical description
Example: glass or plastic
4.3.2 Method of connection
4.3.3 Outline drawing
Dimensions and display pattern
4.3.4 Pinout table and/or connection diagram
4.3.5 LCD cell reference axis for definition of viewing angle
4.3.6 Recommended viewing direction
4.4 Limiting values (absolute maximum rating system) over the operating
temperature range, unless otherwise stated
)
4.4.1 Minimum and maximum storage temperatures (T
stg
4.4.2 Minimum and maximum operating temperatures (T )
op
4.4.3 Maximum ambient humidity (RH)
4.4.4 Minimum and maximum atmospheric pressure outside
4.4.5 Maximum mechanical shock
4.4.6 Maximum vibration
4.4.7 Maximum acceleration
4.4.8 Maximum bending strength of the cell
4.4.9 Maximum torsional strength of the cell

61747-4 © IEC:2012 – 9 –
4.4.10 Maximum r.m.s. value of applied driving voltage
4.4.11 Maximum peak-to-peak value of applied driving voltage
4.4.12 Maximum d.c. voltage component of the applied driving voltage
4.4.13 Maximum soldering temperature and time, where appropriate
4.5 Electrical and optical characteristics
The following parameters should be specified in Table 2:
– viewing direction and contrast condition;
– electrical mode of operation.
Table 2 – Electrical and optical characteristics of LCD cells
Reference Characteristics Condition at T =
...