1、 IEC 61747-1-2 Edition 1.0 2014-08 INTERNATIONAL STANDARD Liquid crystal display devices Part 1-2: Generic Terminology and letter symbols IEC 61747-1-2:2014-08(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part
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10、 If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 61747-1-2 Edition 1.0 2014-08 INTERNATIONAL STANDARD Liquid crystal display devices Part 1-2: Generic Terminology and letter symbols INTERNATIONAL ELECTROT
11、ECHNICAL COMMISSION T ICS 31.120 PRICE CODE ISBN 978-2-8322-1806-8 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 61747-1-2:2014 IEC2014 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative refe
12、rences 5 3 Terms and definitions 5 3.1 Physical concepts . 5 3.2 General terms . 9 3.3 Terms related to specifications, ratings and characteristics, image quality, reliability test, measurement . 15 3.4 Extra components . 19 4 Units and symbols . 19 Bibliography 23 Figure 1 Block diagram for explana
13、tion of supply voltages . 21 Figure 2 Timing chart for explanation of response times 22 Table 1 Letter symbols . 19 IEC 61747-1-2:2014 IEC2014 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LIQUID CRYSTAL DISPLAY DEVICES Part 1-2: Generic Terminology and letter symbols FOREWORD 1) The International E
14、lectrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fiel
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21、cess to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including in
22、dividual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upo
23、n, this IEC Publication or any other IEC Publications. 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
24、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 61747-1-2 has been prepared by IEC technical committee 110: Electronic display devices. This first edition cancels and replaces the
25、 first edition of IEC 61747-1 published in 1998 and Amendment 1:2003. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) The former IEC 61747-1, Generic specification was divided into IEC 61747-1-1
26、, Liquid crystal display devices Part 1-1: Generic Generic specification and IEC 61747-1-2, Liquid crystal display devices Part 1-2: Generic Terminology and letter symbols. b) In this part of IEC 61747, new terms have been added and some of the terms and the definitions have been updated. 4 IEC 6174
27、7-1-2:2014 IEC2014 The text of this standard is based on the following documents: CDV Report on voting 110/526/CDV 110/562/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 acco
28、rdance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 61747 series, under the general title Liquid crystal display devices, can be found on the IEC website. NOTE The structure of IEC 61747 series and the changes in the numbering are shown in Annex D of IEC 61747- 30-1:2012.
29、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 revi
30、sed edition, or amended. A bilingual version of this publication may be issued at a later date. IEC 61747-1-2:2014 IEC2014 5 LIQUID CRYSTAL DISPLAY DEVICES Part 1-2: Generic Terminology and letter symbols 1 Scope This part of IEC 61747 gives the preferred terms, their definitions and symbols for liq
31、uid crystal devices, with the object of using the same terminology when publications are prepared in different countries. 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,
32、only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60027 (all parts), Letter symbols to be used in electrical technology IEC 60050 (all parts), International Electrotechnical Vocabulary (available at ) IEC 606
33、17, Graphical symbols for diagrams ISO 80000-1, Quantities and units Part 1: General 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1 Physical concepts 3.1.1 alignment layer thin layer deposited over the patterned electrodes that determines the
34、 direction of the director at the surface Note 1 to entry: The alignment layer produces the desired ordering. Alignment such as homeotropic alignment or planar alignment is achieved by the co-operative ordering of the liquid crystal molecules locally affected by the surface forces. The alignment lay
35、er generates the pretilt angle. 3.1.2 anti-ferroelectric liquid crystal AFLC type of smectic liquid crystal having no macroscopic electric polarization at zero external field Note 1 to entry: An anti-ferroelectric liquid crystal has a paraelectric state with layers of alternating polarity of permane
36、nt dipoles without an external electric field, and it transfers to a ferroelectric state of parallel alignment when an electric field is applied. 3.1.3 cell gap thickness of the liquid crystal layer between the two support plates 6 IEC 61747-1-2:2014 IEC2014 3.1.4 cholesteric phase liquid crystal ph
37、ase that exhibits planar nematic ordering in which the directors form a helix that has its axis perpendicular to the plane 3.1.5 chiral pitch helical pitch periodic distance needed for directors to rotate by 360 in a helically structured liquid crystal 3.1.6 chiral nematic phase liquid crystal phase
38、 that exhibits planar nematic ordering in which the directors form a helix that has its axis perpendicular to the plane 3.1.7 clearing point phase transition temperature of a liquid crystal for transition toward the isotropic phase 3.1.8 dichroic liquid crystal liquid crystal exhibiting dichroism, i
39、.e. the property of anisotropic absorption of light 3.1.9 direct addressing method of addressing by applying a signal to a terminal that corresponds to a single pixel Note 1 to entry: Hence, all pixels can be addressed individually, in groups or simultaneously 3.1.10 director axial unit vector descr
40、ibing the local axis of symmetry for the orientational distribution function of any chosen molecular axis of a liquid crystal Note 1 to entry: The director co-ordinates define the local alignment of the liquid crystal. 3.1.11 disclination localized alignment defect (appearing generally in the form o
41、f closed or open lines) forming the boundary between areas exhibiting different alignment states 3.1.12 discotic mesophase liquid crystal phase of disc-like shaped molecules exhibiting a long range ordering with respect to the short molecular axis 3.1.13 domain region having a well-defined boundary
42、in which liquid crystal molecules have the same director orientation 3.1.14 dynamic scattering electro-optical effect showing a light scattering caused by turbulent motion in a liquid crystal layer induced by an electro-hydrodynamic effect IEC 61747-1-2:2014 IEC2014 7 3.1.15 electrically controlled
43、birefringence electro-optical effect caused by the birefringence of a liquid crystal layer which can be modulated (varied) by an electric field Note 1 to entry: It is also called “tunable birefringence”. 3.1.16 electrode layer electrically conductive layer, usually transparent, covering the support
44、plates and patterned to establish the display and electric contact configuration Note 1 to entry: The electrode layer may be made, for example, of indium tin oxide (ITO). 3.1.17 ferroelectric liquid crystal liquid crystal phase exhibiting a spontaneous electric polarization Note 1 to entry: The ferr
45、oelectric liquid crystal effect is commonly exhibited in chiral smectic liquid crystal. 3.1.18 film compensated super twisted nematic liquid crystal FSTN liquid crystal which changes the background colour of an STN-LCD to black-and-white, by adding a special layer of compensation film 3.1.19 guest-h
46、ost effect anisotropic optical absorption effect occurring in a dichroic liquid crystal layer containing a dissolved dye 3.1.20 highly twisted nematic liquid crystal cell nematic liquid crystal which has a twisted angle structure of 90 to 180 between two substrates 3.1.21 homeotropic alignment align
47、ment state of a liquid crystal layer for which the director is at all points nominally perpendicular to a support plate surface 3.1.22 liquid crystal material that exhibits a mesophase consisting of elongated (rod-like) or disc-like (discotic) molecules and that possesses at least one long range ori
48、entational ordering with respect to one molecular axis 3.1.23 mesophase mesomorphic phase ordered state of matter between the crystalline and isotropic liquid phases, exhibiting some of the properties of the neighbouring phases, for example in respect of fluidity and birefringence 3.1.24 nematic pha
49、se liquid crystal phase in which the molecules possess a long-range orientational ordering of one molecular axis (uniaxial nematic liquid crystal) or two molecular axes (biaxial nematic liquid crystal) 8 IEC 61747-1-2:2014 IEC2014 3.1.25 phase transition phenomenon in which liquid crystal changes from one phase to another EXAMPLE From the smectic to the nematic phase, the solid to the smectic phase, or the nematic to the isotropic liquid phase 3.1.26 planar alignment alignment state o
