IEC TR 62728:2011

Display technologies - LCD, PDP and OLED - Overview and explanation of differences in terminology

IEC/TR 62728:2011(E) explains the differences in definitions of the terms used in the flat panel display field such as liquid crystal displays (LCD), plasma displays (PDP), and organic light emitting diode displays (OLED). The definitions of technical terms are individually specified in the different standards:
- Liquid crystal display: IEC 61747-1
- Plasma display: IEC 61988-1
- Organic light emitting diode display: IEC 62341-1-2.
This report explains the background and reasons for the differences, but does not introduce new definitions or terms.

Matériels et systèmes de téléconduite - Partie 6: Protocoles de téléconduite compatibles avec les normes ISO et les recommandations de l'UIT-T - Section 1: Contexte applicatif et organisation des normes

Ce rapport technique du type 3 situe la partie 6 dans la série CEI 60870 et donne une vue d'ensemble de son organisation et de son contenu. Le but de cette partie 6 est la normalisation de profils fonctionnels pour les réseaux électriques.[
]Cette publication a le statut d'un rapport technique - type 3.

Telecontrol equipment and systems - Part 6: Telecontrol protocols compatible with ISO standards and ITU-T recommendations - Section1: Application context and organization of standards

General Information

• Status: Published
• Publication Date: 21-Sep-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.120 - Electronic display devices
• ICS: 31.260 - Optoelectronics. Laser equipment
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: TC 110 - Electronic displays
• Current Stage: PPUB - Publication issued
• Start Date: 31-Dec-2011
• Completion Date: 22-Sep-2011
• Ref Project: SIST IEC/TR 60870-6-1:1997 - Telecontrol equipment and systems - Part 6: Telecontrol protocols compatible with ISO standards and ITU-T recommendations - Section 1: Application context and organization of standards

Standards Content (Sample)

SLOVENSKI STANDARD
01-avgust-1997
Telecontrol equipment and systems - Part 6: Telecontrol protocols compatible with
ISO standards and ITU-T recommendations - Section1: Application context and
organization of standards
Telecontrol equipment and systems - Part 6: Telecontrol protocols compatible with ISO
standards and ITU-T recommendations - Section 1: Application context and organization
of standards
Matériels et systèmes de téléconduite - Partie 6: Protocoles de téléconduite compatibles
avec les normes ISO et les recommandations de l'UIT-T - Section 1: Contexte applicatif
et organisation des normes
Ta slovenski standard je istoveten z: IEC/TR 60870-6-1
ICS:
33.200 Daljinsko krmiljenje, daljinske Telecontrol. Telemetering
meritve (telemetrija)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------
...

IEC/TR 62728 ®
Edition 1.0 2011-09
TECHNICAL
REPORT
Display technologies – LCD, PDP and OLED – Overview and explanation of
differences in terminology
IEC/TR 62728:2011(E)
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IEC/TR 62728 ®
Edition 1.0 2011-09
TECHNICAL
REPORT
Display technologies – LCD, PDP and OLED – Overview and explanation of
differences in terminology
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
L
ICS 31.120; 31.260 ISBN 978-2-88912-695-8

– 2 – TR 62728 © IEC:2011(E)
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Covered terms . 7
4 Explanation . 7

TR 62728 © IEC:2011(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DISPLAY TECHNOLOGIES –
LCD, PDP AND OLED –
OVERVIEW AND EXPLANATION OF
DIFFERENCES IN TERMINOLOGY
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62728, which is a technical report, has been prepared by IEC technical committee 110:
Flat panel display devices.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
110/301/DTR 110/320/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.

– 4 – TR 62728 © IEC:2011(E)
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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.
TR 62728 © IEC:2011(E) – 5 –
INTRODUCTION
Traditionally each display technology (LCD, PDP and OLED) has developed its standards
independently. However because of the common applications for these technologies (e.g. TV),
the differences in the terms and measurement methods used by the different technologies are
causing confusion.
In 2007, TC110 decided to establish a study group to address these issues. This group
decided to initially address the differences in terminology. Experts representing each working
group (working group No.2: LCD, No.4: PDP, and No.5: OLED) agreed to work toward
harmonizing their terminology standards at the maintenance time.
Cases were found where a standard term differed from International Electrotechnical
Vocabulary (IEV), which is used by IEC for basic definitions.
In the case where agreement on harmonization could not be reached the study group decided
to explain the reason for the disagreement.
This technical report explains the differences of the definitions for 10 terms and the reasons
why they are different. It is expected that this report will help consumers to understand these
differences and to use these technical terms without confusion.

– 6 – TR 62728 © IEC:2011(E)
DISPLAY TECHNOLOGIES –
LCD, PDP AND OLED –
OVERVIEW AND EXPLANATION OF
DIFFERENCES IN TERMINOLOGY
1 Scope
This technical report explains differences in definitions of the terms used in the flat panel
display field such as liquid crystal displays (LCD), plasma displays (PDP), and organic light
emitting diode displays (OLED). The definitions of technical terms are individually specified
in the different standards:
– Liquid crystal display: IEC 61747-1
– Plasma display: IEC 61988-1
– Organic light emitting diode display: IEC 62341-1-2.
This report explains the background and reasons for the differences, but does not introduce
new definitions or terms.
2 Normative references
The following referenced documents are indispensable for the application 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 60050-845:1987, International Electrotechnical Vocabulary. Lighting
IEC 61747-1:1998, Liquid crystal and solid-state display devices – Part 1: Generic
specification
Amendment 1 (2003)
IEC 61988-1:2003, Plasma display panels – Part 1: Terminology and letter symbols
IEC 62341-1-2:2007, Organic light emitting diode displays – Part 1-2: Terminology and letter
symbols
TR 62728 © IEC:2011(E) – 7 –
3 Covered terms
In this document, explanations on the following terms are provided.
Term Subclause
active area 4.2.1
addressing 4.2.2
aspect ratio 4.2.3
contrast ratio 4.2.4
luminance lifetime 4.2.5
luminous efficacy 4.2.6
luminous efficiency 4.2.7
quantum efficiency 4.2.8
screen area 4.2.1
viewing angle 4.2.10
viewing direction 4.2.10
viewing angle range 4.2.10
4 Explanation
4.1 General
Hereafter the standards of terms and definitions are indicated as [IEV] for
IEC 60050-845:1987, [LCD] for IEC 61747-1:1998 (and Amendment 1:2003), [PDP] for
IEC 61988-1:2003, and [OLED] for IEC 62341-1-2:2007, respectively.
Note that some definition texts were simplified by omitting Notes.
Each clause consists of:
– defined word(s)
– definition in the standard [IEV], [LCD], [PDP], or [OLED]
– issues, and
– explanation.
– 8 – TR 62728 © IEC:2011(E)
4.2 Items
4.2.1
active area
screen area
Definition in [LCD] Definition in [PDP] Definition in [OLED]
active area screen area active area
part of a display screen area maximum image reproducing area area that has a display function on
delimited by picture elements of the device the substrate of an organic light
emitting diode display
Issue
“Active area” and “screen area” are often used with the same meaning but are defined differently for [LCD] and
[PDP].
Explanation
“Active area” and “screen area” are often used with the same meaning. Sometimes “active area” can be
regarded as only an area covered by “active” pixels, omitting non-active pixels. To avoid this ambiguity, PDP
experts agreed to use the term “screen area” instead, which is more familiar in the market. Since “active area”
has also been often used, a note “sometimes called as active area” was added to [PDP] standard for
harmonization.
4.2.2
addressing
Definition in [LCD] Definition in [PDP] Definition in [OLED]
addressing addressing
selecting the pixels in space and/or setting or changing the state of a
time for activation or deactivation subpixel with an address pulse
Issue
“Addressing” is a basic action of the display. The definition of [LCD] and [PDP] could not be harmonized.
Explanation
Since addressing principles for LCD and PDP are quite different, the words for definition need to be different.
For LCD, the word “activation” is most suitable to express how to fix the selected pixels to display an image.
However this would not be a correct wording for a PDP. A PDP has inherent memory in each subpixel, and so
the state of this memory must be altered. This is not an “activate” or “deactivate” operation. Most other display
devices do not have this memory effect.

4.2.3
aspect ratio
Definition in [LCD] Definition in [PDP] Definition in [OLED]
aspect ratio aspect ratio
ratio of screen width to screen ratio of active area width to active
height area height, for example 4:3 or
16:9
Issue
Explanation
See “active area” (4.2.1)
TR 62728 © IEC:2011(E) – 9 –
4.2.4
contrast ratio
Definition in [LCD] Definition in [PDP] Definition in [OLED]
contrast ratio contrast ratio contrast ratio
the ratio between the higher, L ratio of white luminance to black ratio of white luminance to black
H
and lower, L luminances that luminance of the image, inclu
...