IEC 61747-20-1-2015 Liquid crystal display devices - Part 20-1 Visual inspection - Monochrome liquid crystal display cells (excluding all active matrix liquid c.pdf

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1、 IEC 61747-20-1 Edition 1.0 2015-02 INTERNATIONAL STANDARD Liquid crystal display devices Part 20-1: Visual inspection Monochrome liquid crystal display cells (excluding all active matrix liquid crystal display cells) IEC 61747-20-1:2015-02(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015

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9、 Electrotechnical Vocabulary (IEV) online. IEC Glossary - std.iec.ch/glossary More than 60 000 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

10、of IEC TC 37, 77, 86 and CISPR. IEC Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 61747-20-1 Edition 1.0 2015-02 INTERNATIONAL STANDARD Liquid crystal displ

11、ay devices Part 20-1: Visual inspection Monochrome liquid crystal display cells (excluding all active matrix liquid crystal display cells) INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.120 ISBN 978-2-8322-2256-0 Registered trademark of the International Electrotechnical Commission Warning! Make s

12、ure that you obtained this publication from an authorized distributor. 2 IEC 61747-20-1:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms, definitions and abbreviations . 6 3.1 Terms and definitions 6 3.2 Abbreviations 6 4 Visual inspection method and cr

13、iteria 6 4.1 Standard inspection conditions and methods 6 4.1.1 Ambient conditions 6 4.1.2 Inspection equipment and liquid crystal display cells . 7 4.1.3 Inspector and limit sample for visual inspection . 7 4.1.4 Inspection and record of result. 7 4.2 Visual inspection of display . 7 4.2.1 Display

14、not activated . 7 4.2.2 Display activated . 9 4.2.3 Seal inspection 11 4.2.4 Contact pad area . 12 4.2.5 Chipped material at the borders and edges of support plates of cells . 13 Bibliography 14 Figure 1 Defects within the viewing area 8 Figure 2 Deviations of dimensions and shape e1 to e4 . 9 Figur

15、e 3 Defects within segments 9 Figure 4 Defects within the sealing area 11 Figure 5 Defects of contact pad area . 12 Figure 6 Damage of a corner and an edge . 13 Table 1 Visual defects to be inspected . 8 Table 2 Properties of display area to be inspected . 10 Table 3 Defects of display area to be in

16、spected . 10 Table 4 Defects of viewing area to be inspected 10 Table 5 Defects of sealing area to be inspected . 11 Table 6 Visual defects of contact pad area to be inspected 12 Table 7 Defects of pin to be inspected . 13 Table 8 Defects of lead to be inspected . 13 Table 9 Defects of support plate

17、 to be inspected 13 IEC 61747-20-1:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LIQUID CRYSTAL DISPLAY DEVICES Part 20-1: Visual inspection Monochrome liquid crystal display cells (excluding all active matrix liquid crystal display cells) FOREWORD 1) The International Electrotechnical

18、 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 fields. To this end

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25、ks 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 individual expert

26、s 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 upon, this IEC Pub

27、lication 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 of this IEC Pub

28、lication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61747-20-1 has been prepared by IEC technical committee 110: Electronic display devices. This first edition cancels and replaces Clause 6 of the f

29、irst edition of IEC 61747-5 published in 1998. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) The editorial modifications were done in accordance with the ISO/IEC Directives, Part 2, Ed. 6.0:20

30、11. b) The document number was changed to align with the new numbering structure of the IEC 61747 series. 4 IEC 61747-20-1:2015 IEC 2015 NOTE It is intended that the other clauses of IEC 61747-5:1998 will be replaced by new parts in the IEC 61747 series. The details of the intended changes are given

31、 in Annex D of IEC 61747-30-1:2012. The text of this standard is based on the following documents: CDV Report on voting 110/522/CDV 110/558A/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 be

32、en drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 61747 series, published under the general title Liquid crystal display devices, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until th

33、e stability date indicated on the IEC website 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. A bilingual version of this publication may be issued at a later date.

34、 IEC 61747-20-1:2015 IEC 2015 5 INTRODUCTION This part of IEC 61747 facilitates the visual inspection of image defects of monochrome LCD cells by human eyes subjectively. Visual inspection is performed at specified conditions and criteria. The objective measurement method of visual image defect with

35、 an instrument will be studied and standardized. 6 IEC 61747-20-1:2015 IEC 2015 LIQUID CRYSTAL DISPLAY DEVICES Part 20-1: Visual inspection Monochrome liquid crystal display cells (excluding all active matrix liquid crystal display cells) 1 Scope This part of IEC 61747 gives the details of testing a

36、nd provides general rules for visual inspection of the non-active and active area of monochrome liquid crystal display cells by the human eye, if necessary, through an optical microscope. Furthermore this standard includes defect definitions and the methods for visual defect inspection. NOTE Restric

37、tions on defect types, number, and sizes are specified in the quality contract (customer acceptance specification and incoming inspection specification). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its app

38、lication. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61747-1-2:2014, Liquid crystal display devices Part 1-2: Generic Terminology and letter symbols IEC 61747-10-2:2014, Liquid cr

39、ystal display devices Part 10-2: Environmental, endurance and mechanical test methods Environmental and endurance 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the terms, definitions and letter symbols given in IEC 61747-1-2 and IEC 61747-10-2 ap

40、ply. 3.2 Abbreviations DUT Device under test 4 Visual inspection method and criteria 4.1 Standard inspection conditions and methods 4.1.1 Ambient conditions 4.1.1.1 Temperature All visual inspection shall be carried out under specified temperature. Refer to IEC 61747-10-2:2014, Clause 4. 4.1.1.2 Hum

41、idity All visual inspection shall be carried-out under specified humidity. Refer to IEC 61747-10- 2:2014, Clause 4. IEC 61747-20-1:2015 IEC 2015 7 4.1.1.3 Illuminance All visual inspection shall be carried out under illumination levels as specified in the detail specification. The illumination level

42、 shall be adjusted in such a way that it allows for an accurate visual inspection. 4.1.2 Inspection equipment and liquid crystal display cells The DUT will be installed on a rotatable fixture to enable changes in the horizontal and vertical viewing direction range. Alternatively, the inspector moves

43、 around and the DUT is fixed. Turn on the direct current power supply and pattern generator and warm up for stabilization. Supply the driving voltage and pattern to the DUT. The warm-up time of the DUT shall be sufficiently long to obtain a stable signal, necessary for the visual inspection. 4.1.3 I

44、nspector and limit sample for visual inspection The inspector shall have a (corrected-to) normal vision, a normal colour vision and shall be periodically trained with specified limit samples in order to accurately carry out the visual examination. 4.1.4 Inspection and record of result The inspector

45、shall carry out the visual inspection based on the specified procedure and record the results on recording sheets with the specified inspection conditions. 4.2 Visual inspection of display 4.2.1 Display not activated 4.2.1.1 Test conditions to be specified in the detail specification The test condit

46、ions to be specified in the detail specification are: The test conditions of the visual inspection shall be described for the following conditions: the viewing direction range; the illumination from above or through the device (depending on the application); the duration; the viewing distance. 4.2.1

47、.2 Procedure Devices shall be inspected for the following visual defects in Table 1. 8 IEC 61747-20-1:2015 IEC 2015 Table 1 Visual defects to be inspected Spots (see Figure 1), bubbles, foreign particles To be specified in the detail specification Light/dark stains on light background To be specifie

48、d in the detail specification Light/dark stains on dark background To be specified in the detail specification Scratches on the liquid crystal cell and on the polarizer within the specified viewing direction range To be specified in the detail specification Mechanical damage outside of viewing area

49、(see Figures 5 and 6) To be specified in detail specification Accumulation of the above-listed visible defects Reference samples Visible structure of the electrodes within the viewing area Reference samples Non-uniformity of luminance and colours within the viewing area of the display and within the specified viewing direction range Reference samples Dirt on surface, e.g. finger prints, adhesive residue Reference samples Key A = contact pads D = defect B =