IEC 6271 5 6 2 Edition 1 0 201 7 05 INTERNATIONAL STANDARD Flexible display devices – Part 6 2 Environmental testing methods IE C 6 2 7 1 5 6 2 2 0 1 7 0 5 (e n ) ® TH IS PUBLICATION IS COPYRIGHT PROT[.]
I E C 62 5-6-2 ® I N TE RN ATI ON AL S TAN D ARD F l e xi bl e d i s pl a y d e vi ce s – IEC 6271 5-6-2:201 7-05(en) P art 6-2 : E n vi ron m e n tal te s ti n g m eth od s Edition 201 7-05 T H I S P U B L I C AT I O N I S C O P YRI G H T P RO T E C T E D C o p yri g h t © I E C , G e n e v a , S wi tz e rl a n d All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester If you have any questions about I EC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local I EC member National Committee for further information IEC Central Office 3, rue de Varembé CH-1 21 Geneva 20 Switzerland Tel.: +41 22 91 02 1 Fax: +41 22 91 03 00 info@iec.ch www.iec.ch Ab ou t th e I E C The I nternational Electrotechnical Commission (I EC) is the leading global organization that prepares and publishes I nternational Standards for all electrical, electronic and related technologies Ab o u t I E C p u b l i ca ti o n s The technical content of IEC publications is kept under constant review by the IEC Please make sure that you have the latest edition, a corrigenda or an amendment might have been published I E C Catal og u e - webstore i ec ch /catal og u e The stand-alone application for consulting the entire bibliographical information on IEC International Standards, Technical Specifications, Technical Reports and other documents Available for PC, Mac OS, Android Tablets and iPad I E C pu bl i cati on s s earch - www i ec ch /search pu b The advanced search enables to find IEC publications by a variety of criteria (reference number, text, technical committee,…) It also gives information on projects, replaced and withdrawn publications E l ectroped i a - www el ectroped i a org The world's leading online dictionary of electronic and electrical terms containing 20 000 terms and definitions in English and French, with equivalent terms in additional languages Also known as the International Electrotechnical Vocabulary (IEV) online I E C G l os sary - s td i ec ch /g l oss ary 65 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002 Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR I E C J u st Pu bl i s h ed - webstore i ec ch /j u stpu bl i sh ed Stay up to date on all new IEC publications Just Published details all new publications released Available online and also once a month by email I E C C u stom er S ervi ce C en tre - webstore i ec ch /csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csc@iec.ch I E C 62 5-6-2 ® Edition 201 7-05 I N TE RN ATI ON AL S TAN D ARD F l e xi bl e d i s pl a y d e vi ce s – P art 6-2 : E n vi ron m e n tal te s ti n g m e th od s INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31 20 ISBN 978-2-8322-4370-1 Warn i n g ! M ake s u re th a t you ob tai n ed th i s p u b l i cati on from an au th ori zed d i stri b u tor ® Registered trademark of the International Electrotechnical Commission –2– I EC 6271 5-6-2: 201 © I EC 201 CONTENTS FOREWORD Scope Norm ative references Terms and definitions Structure of m easuring equipm ent Standard conditions Standard reference atmosphere Standard atm ospheric conditions for referee m easurem ents and tests Standard atm ospheric conditions for m easurements and tests Recovery conditions 5 Standard atm ospheric conditions for assisted dryi ng Operating conditions Standard flexible display test configuration Measurem ents and anal ysis Environm ental testing m ethods General Storage at high tem perature Purpose 2 Test conditions Storage at low temperature Purpose Test conditions Temperature change, storage Purpose Rapid change of temperature Specified change rate of temperature Damp heat, stead y state, storage 1 Purpose 1 Test conditions 1 Damp heat, cyclic, storage 1 Purpose 1 Test conditions 1 7 Operation at high tem perature 7 Purpose 7 Test conditions Operation at low temperature Purpose Test conditions Damp heat, stead y state, operational Purpose Test conditions Bibliograph y I EC 6271 5-6-2: 201 © I EC 201 –3– Table – Standard conditions for referee m easurem ents and tests Table – Assisted drying condition Table – Exam ples of the damp heat, stead y state test conditions 1 –4– I EC 6271 5-6-2: 201 © I EC 201 INTERNATI ONAL ELECTROTECHNI CAL COMMISSI ON F L E XI B L E D I S P L AY D E VI C E S – P a rt -2 : E n vi ro n m e n ta l te s t i n g m e t h o d s FOREWORD ) The I nternati on al Electrotechni cal Comm ission (I EC) is a worl d wid e organization for stan dardization com prisin g all n ation al el ectrotechnical comm ittees (I EC National Comm ittees) The object of I EC is to prom ote internati onal co-operation on all questions concerni ng stand ardi zati on in the el ectrical an d electronic fields To this end and in additi on to other acti vities, I EC publish es I nternational Stan dards, Techn ical Specifications, Technical Reports, Publicl y Avail abl e Specificati ons (PAS) an d Gu ides (h ereafter referred to as “I EC Publication(s)”) Thei r preparation is entrusted to technical comm ittees; any I EC National Comm ittee interested in the subj ect dealt with m ay partici pate in this preparatory work I nternational, governm ental an d n on governm ental organ izations l iaising with th e I EC also participate i n this preparation I EC collaborates closel y with the I ntern ational Organi zation for Stand ardization (I SO) in accordance with ditions determ ined by agreem ent between th e two organi zati ons 2) The form al decisions or ag reem ents of I EC on tech nical m atters express, as n early as possible, an i nternati onal consensus of opi nion on the rel evant subjects since each technical com m ittee has representati on from all interested I EC N ational Com m ittees 3) I EC Publications have the 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Standard I EC 6271 5-6-2 has been prepared by I EC technical com mittee 1 0: Electronic display devices The text of this I nternational Standard is based on the following documents: FDI S Report on votin g 1 0/860/FDI S 1 0/871 /RVD Full information on the voting for the approval of this I nternational Standard can be found in the report on voting indicated in the above table This docum ent has been drafted in accordance with the I SO/I EC Directives, Part A list of all parts in the I EC 6271 series, published under the general title Flexible display devices , can be found on the I EC website I EC 6271 5-6-2: 201 © I EC 201 –5– The com mittee has decided that the contents of this docum ent will rem ain unchanged until the stability date indicated on the I EC website under "http://webstore iec.ch" in the data related to the specific document At this date, the document will be • • • • reconfirmed, withdrawn, replaced by a revised edition, or am ended A bilingual version of this publication m ay be issued at a later date –6– I EC 6271 5-6-2: 201 © I EC 201 F L E XI B L E D I S P L AY D E VI C E S – P a rt -2 : E n vi ro n m e n ta l te s t i n g m e t h o d s S cop e This part of I EC 6271 specifies testing m ethods for evaluating the environmental endurance of flexible display panels and modules for use, storage and transport under assumed usage environment This part of I EC 6271 is applicable to flexible display panels and m odules such as liquid crystal display devices (LCDs), electric paper display devices (EPDs), and organic light em itting diode display devices (OLEDs) This part of I EC 6271 will also be suitable for flexible panel or module with m echanical operation N o rm a t i ve re fe re n c e s The following docum ents are referred to in the text in such a way that som e or all of their content constitutes requirements of this docum ent For dated references, onl y the edition cited applies For undated references, the latest edition of the referenced docum ent (including an y am endm ents) applies I EC 60068-1 : 201 3, Environmental testing – Part 1: General and guidance I EC 60068-2-1 , Environmental testing – Part 2-1: Tests – Test A: Cold IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat IEC 60068-2-1 4, Environmental testing – Part 2-14: Tests – Test N: Change of temperature I EC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic (12 h + 12 h cycle) IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state IEC 62341 -6-2, Organic light emitting diode (OLED) displays – Part 6-2: Measuring methods of visual quality and ambient performance IEC 62341 -6-3, Organic light emitting diode (OLED) displays – Part 6-3: Measuring methods of image quality IEC 6271 5-1 -1 , Flexible display devices – Part 1-1: Terminology and letter symbols IEC 6271 5-5-1 , Flexible display devices – Part 5-1: Measuring methods of optical performance I EC 6271 5-5-3 2, Flexible display devices – Part 5-3: Visual assessment Under preparati on Stag e at th e tim e of publicati on: I EC/FDI S I EC 6271 5-5-1 : 201 Und er preparati on Stag e at the tim e of publicati on: I EC/FDI S I EC 6271 5-5-3: 201 I EC 6271 5-6-2: 201 © I EC 201 –7– IEC 6271 5-6-1 , Flexible display devices – Part 6-1: Mechanical stress test methods IEC 62679-3-2, Electronic paper display – Part 3-2: Measuring method – Electro-optical Terms an d defi ni ti ons For the purposes of this document, the term s and definitions given in I EC 6271 5-1 -1 and I EC 60068-1 appl y I SO and I EC maintain term inological databases for use in standardization at the following addresses: • • I EC Electropedia: available at http://www electropedia org/ I SO Online browsing platform : available at http: //www iso.org/obp Structure of measuri n g equi pment The system diagrams and/or operating conditions of the measuring equipment shall com pl y with the structure specified in each item 5 Stand ard condi ti on s Stan d ard referen ce atm osph ere The following conditions are applied: – tem perature: 25 °C – air pressure: 01 ,3 kPa NOTE No req uirem ent for rel ative hum idity is gi ven because correction by calcu lation is g enerall y n ot possibl e I f the parameters to be measured depend on temperature and/or pressure, and their dependence on temperature and pressure is known, the parameter values can be m easured under the conditions specified in and corrected by calculation to the standard reference atm osphere above Stan d ard atm osph eri c d i ti on s for referee m easu rem en ts an d tests I f the param eters to be m easured depend on temperature, pressure and hum idity and their dependence on tem perature, pressure and humidity is unknown, the atm ospheres to be specified shall be selected from the following values, as shown in Table The selected values shall be noted in the relevant specifications Tabl e – Stan d ard d i ti on s for referee m easu rem en ts an d tests Tem peratu re a °C Rel ati ve h u m i d i ty b Ai r pressu re % RH kPa 45 to 75 86 to 06 b 20 ±2 / ±1 25 ±2 / ±1 30 ±2 / ±1 35 ±2 / ±1 a The close tolerances m ay be used for the referee m easurem ents The wid er tolerances m ay be used onl y when allowed by the relevant specification b I nclusive val ues –8– I EC 6271 5-6-2: 201 © I EC 201 Stan d ard atmosph eri c dition s for m easu rem en ts an d tests Unless otherwise specified, all tests and measurem ents shall be carried out under standard atm ospheric conditions: – tem perature: °C to 35 °C – relative humidity: 25 % to 85 %, where appropriate – air pressure: 86 kPa to 06 kPa Recovery d iti on s The recovery conditions specified in I EC 60068-1 : 201 3, 4, shall be applied The flexible panel or module shall be subj ected to the recovery procedure in the cham ber or otherwise as appropriate The flexible panel or m odule shall then remain under standard atm ospheric conditions for recovery for a period adequate for the attainment of tem perature stability, with a minimum of h If required by the relevant specification, the panel or module shall be switched on or loaded and m easured continuousl y during the recovery period If the standard conditions given above are not appropriate for the device to be tested, the relevant specification may call for other recovery conditions 5 Stan d ard atmosph eri c dition s for assisted d ryin g The conditions specified in I EC 60068-1 : 201 3, 5, shall be applied Where assisted drying is required before comm encing a series of measurements, the following conditions (see Table 2) shall be used for h, unless otherwise prescribed by the relevant specification Table – Assi sted d ryi n g d iti on Tem peratu re 55 a ℃±2℃ Rel ati ve h u m i d i ty Ai r pressu re a Not exceedin g 20 % 86 kPa to 06 kPa I nclusive val ues I f it is impracticable to carry out assisted drying under the standard conditions for assisted drying, a note, stating the actual conditions, shall be added to the test report When the specified temperature for the dry heat test is lower than 55 °C, the assisted drying shall be carried out at that lower tem perature Operatin g d ition s Appl y a white level (1 00 % grey level) to the full screen of the flexible display panels or modules Stan d ard fl exi bl e di spl ay test fi gu rati on Unless otherwise specified, the flexible display panels or m odules shall be tested in a state that is read y for normal operation without an y protective elem ents added, nor voltage applied I EC 6271 5-6-2: 201 © I EC 201 –9– Measurements and analysis The following item s shall be evaluated at the beginning, after the cyclic bending test and after the final environm ent test: a) Visual inspection Visual inspection shall be perform ed according to I EC 6271 5-5-3 b) Optical performance Optical perform ance m easurement shall refer to I EC 6271 5-5-1 c) I mage quality I m age quality measurem ent shall refer to I EC 62341 -6-2 and I EC 62341 -6-3 EPD m easuring conditions refer to I EC 62679-3-2 Depending on the purpose of the test, onl y one, some or all of the m ethods shall be used The measuring frequency and evaluation criteria shall be specified in the detailed specifications Environmental testing methods 7.1 General For the flexible panel or m odule, the m echanical cycling test should be done before the temperature and hum idity test First and foremost, the flexible panel or module shall endure the cyclic bending tests The bending radius and bending tim es are according to the product detail specification The detailed cyclic bending test refers to I EC 6271 5-6-1 After the bending test, the flexible panel or m odule shall be tested with the tem perature and humidity The temperature and humidity testing method is often used as one of several endurance testing methods When the testing m ethod defined in this docum ent is used as one of these endurance testing m ethods, review the testing period and/or conditions appropriatel y as specified in the relevant specification I f the product is curved, it can go through the tem perature and humidity test directl y For the test of electrical operation, the operating conditions shall refer to Before the final m easurements, the recovery procedure referred to in 5.4 should be com pleted The effect of simultaneous stress com bination between the m echanical cycling test and the other tests shall be evaluated if necessary according to the specifications 7.2 7.2.1 Storage at high temperature Pu rpose The purpose of this test is to check the perform ance of the flexible display panel and module after high tem perature storage The test procedure of I EC 60068-2-2 shall be applied 7.2.2 Test conditions Test Bb of I EC 60068-2-2 shall be applied with the following specific conditions Test Bb: Dry heat for non heat-dissipating specimens with gradual change of tem perature a) Tem perature (1 00, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30) °C ± °C – 10 – I EC 6271 5-6-2: 201 © I EC 201 b) Duration time h, h, 24 h, 48 h, 72 h, 96 h, 20 h, 68 h, 92 h, 240 h, 300 h, 500 h and 000 h The temperature and duration used shall be noted in the report 7 Storag e at l ow tem peratu re Pu rpose The purpose of this test is to check the performance of the flexible display panel and module after low temperature storage The test procedure of I EC 60068-2-1 shall be applied Test d i ti on s Test Ab of I EC 60068-2-1 shall be applied with the following specific conditions Test Ab: Cold for non heat-dissipating specimens with gradual change of temperature a) Tem perature (-50, -45, -40, -35, -30, -25, -20, -1 5, -1 0, -5, 0) °C ± °C b) Duration time h, h, 24 h, 48 h, 72 h, 96 h, 20 h, 68 h, 92 h, 240 h, 300 h, 500 h and 000 h The temperature and duration used shall be noted in the report 7 Tem peratu re ch an g e, storag e Pu rpose The purpose of this test is to check the ability of the flexible display panel and module to withstand either rapid change of tem perature or specific change rate of temperature while the flexible display m odule is turned off Test N a of I EC 60068-2-1 shall be applied to rapid change of temperature and Test N b to the specified rate of temperature The tem perature and duration should be chosen based on specifications Rapi d ch an g e of tem peratu re a) High tem perature (1 00, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30) °C ± °C b) Low temperature (-50, -45, -40, -35, -30, -25, -20, -1 5, -1 0, -5, 0) °C ± °C c) Duration time h, h, 30 m in, d) Transition tim e Less than e) Cycle 5, 0, 20, or 30 Speci fi ed ch an g e rate of tem peratu re a) High temperature (1 00, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30) °C ± °C b) Low tem perature (-50, -45, -40, -35, -30, -25, -20, -1 5, -1 0, -5, 0) °C ± °C c) Duration tim e I EC 6271 5-6-2: 201 © I EC 201 – 11 – h, h, 30 min, d) Change rate of tem perature (1 ± 0, 2) °C/min, (3 ± 0, 6) °C/m in or (5 ± ) °C/m in e) Cycle 2, 5, 0, 20 or 30 7.5 7.5.1 Damp heat, steady state, storage Pu rpose The purpose of this test is to check the performance of the flexible displ ay panel or m odule after temperature and hum idity storage The test procedure of I EC 60068-2-78 shall be applied 7.5.2 Test conditions I EC 60068-2-78 shall be applied with the following specific conditions a) Tem perature The tem perature shall be selected from the values given below depending on application (60, 55, 50, 45, 40, 35, 30, 25, 20, 5, 0) °C ± °C b) Hum idity The humidity shall be selected from the values given below depending on application (1 0, 5, 20, 30, 80, 85, 90, 93) % RH ± % RH c) Duration tim e The duration shall be selected from the values given below depending on application h, h, 24 h, 48 h, 72 h, 96 h, 20 h, 68 h, 92 h, 240 h, 300 h, 500 h and 000 h The tem perature, humidity and duration used shall be noted in the report (see Table 3) Table – Examples of the damp heat, steady state test conditions 7.6 7.6.1 Temperature Humidity Duration Note H-L 55 ºC 30 % RH 68 h Hot an d d ry H-H 60 ºC 90 % RH 20 h Hot an d h um id L-H ºC 80 % RH 20 h Cold an d hum id L-L 20 ºC % RH 240 h Cold an d dry Damp heat, cyclic, storage Pu rpose The purpose of this test is to check the perform ance of the flexible display m odule under conditions of high hum idity, combined with cyclic tem perature changes depending on application The test procedure of I EC 60068-2-30 shall be applied 7.6.2 Test conditions IEC 60068-2-30 shall be applied with the following specific conditions a) High tem perature The temperature shall be selected from the values given below depending on application (60, 55, 50, 45, 40, 35) °C ± °C – 12 – I EC 6271 5-6-2: 201 © I EC 201 b) Low temperature (25 ± 3) °C c) Humidity (93 ± 3) % RH d) Cycle The num ber of cycles shall be selected from the values given below depending on application , 2, 5, 0, 20, 30 or 50 The temperature, hum idity and cycle used shall be noted in the report 7 7 Operati on at h i g h tem peratu re Pu rpose The purpose of this test is to check the perform ance of the flexible display panel and m odule after operation at high tem perature operating conditions The test procedure of I EC 60068-2-2 shall be applied 7 Test d i ti on s Test Bd or Be of I EC 60068-2-2 shall be applied with the following specific conditions The relevant specification shall define the test (Bd or Be) to be used Depending on the application, the com bination of tem perature and operating tim e should be considered Test Bd: Dry heat for heat-dissipating specimens with gradual change of temperature that are not powered during the conditioning period Test Be: Dry heat for heat-dissipating specimens with gradual change of temperature that are required to be powered throughout the test a) Tem perature (80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30) °C ± °C b) Operating tim e h, h, h, h, 24 h, 48 h, 72 h and 96 h c) Operating conditions The operating conditions are specified in The tem perature and duration used shall be noted in the report 8 Operati on at l ow tem peratu re Pu rpose The purpose of this test is to check the performance of the flexible display panel and m odule after operation at low tem perature operating conditions The test procedure of I EC 60068-2-1 shall be applied Test d i ti on s Test Ad or Ae of I EC 60068-2-1 shall be applied with the following specific conditions I EC 6271 5-6-2: 201 © I EC 201 – 13 – The relevant specification shall define the test (Ad or Ae) to be used Depending on application, the combination of tem perature and operating tim e should be considered Test Ad: Cold for heat-dissipating specimens with gradual change of temperature that are powered after initial temperature stabilization Test Ae: Cold for heat-dissipating specim ens with gradual change of tem perature that are required to be powered throughout the test a) Tem perature (-30, -25, -20, -1 5, -1 0, -5, 0) °C ± °C b) Operation tim e h, h, h, h, 24 h, 48 h, 72 h and 96 h c) Operating conditions The operating conditions are specified in The tem perature and duration used shall be noted in the report 9 Dam p h eat, stead y state, operati on al Pu rpose The purpose of this test is to check the performance of the flexible display panel or module after operation at high temperature and high hum idity operati ng conditions The test procedure of I EC 60068-2-78 shall be applied Test d i ti on s I EC 60068-2-78 shall be applied with the following specific conditions No condensation on the flexible display panel or module shall be generated I EC 60068-2-78 shall be applied with the following specific conditions Depending on application, the com bination of temperature and operating tim e should be considered a) Tem perature The temperature shall be selected from the values given below depending on application (60, 55, 50, 45, 40, 35, 30) °C ± °C b) Hum idity The humidity shall be selected from the values given below depending on application (1 0, 5, 20, 30, 80, 85, 90, 93) % RH ± % RH c) Duration tim e The duration shall be selected from the values given below depending on application h, h, h, h, 24 h, 48 h, 72 h and 96 h The temperature, hum idity and duration used shall be noted in the report – 14 – I EC 6271 5-6-2: 201 © I EC 201 Bibliography I EC 62341 -6-1 , Orga n ic ligh t e m ittin g dio de (OL ED) disp la ys – Pa rt 6- : Me a s urin g m e th o ds of o p tica l a n d e le ctro- o p tica l p a m e te rs I EC 62679-4-2, Ele ctro n ic p a p e r dis p la ys – Pa rt -2: En viro n m e n ta l te s t m e th ods _ I N TE RN ATI O N AL E LE CTRO TE CH N I CAL CO M M I S S I O N 3, ru e d e Va re m bé P O B ox CH -1 1 G e n e va S wi tze rl a n d Te l : + 41 F a x: + 22 91 02 1 22 91 03 00 i n fo @i e c ch www i e c ch