IEC 61747-20-2-2015 Liquid crystal display devices - Part 20-2 Visual inspection - Monochrome matrix liquid crystal display modules (excluding all active matrix.pdf

1、 IEC 61747-20-2 Edition 1.0 2015-03 INTERNATIONAL STANDARD Liquid crystal display devices Part 20-2: Visual inspection Monochrome matrix liquid crystal display modules (excluding all active matrix liquid crystal display modules) IEC 61747-20-2:2015-03(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copy

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11、ystal display devices Part 20-2: Visual inspection Monochrome matrix liquid crystal display modules (excluding all active matrix liquid crystal display modules) INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.120 ISBN 978-2-8322-2391-8 Registered trademark of the International Electrotechnical Comm

12、ission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 61747-20-2:2015 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 ins

13、pection method and criteria . 6 4.1 Standard inspection conditions and methods . 6 4.1.1 Ambient conditions . 6 4.1.2 Inspection equipment and liquid crystal display modules . 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 o

14、f display . 7 4.2.1 Display not activated 7 4.2.2 Display activated 9 Bibliography . 13 Figure 1 Defects within the viewing area . 8 Figure 2 Deviations and mis-shapes of a square picture element 9 Figure 3 Notched edges of picture elements . 9 Figure 4 Defects within the elements and their surround

15、ings . 10 Table 1 Defects and criteria when display not activated . 8 Table 2 Properties and criteria when display activated 10 Table 3 Defects and criteria when display activated 10 Table 4 Defect and criteria of viewing area . 12 IEC 61747-20-2:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMIS

16、SION _ LIQUID CRYSTAL DISPLAY DEVICES Part 20-2: Visual inspection Monochrome matrix liquid crystal display modules (excluding all active matrix liquid crystal display modules) FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

17、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 and in addition to other activities, IEC publishes International Standards,

18、Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory

19、 work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organization

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23、blication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by inde

24、pendent 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 experts and members of its technical committees and IEC National Committees for any

25、 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 Publication or any other IEC Publications. 8) Attention is drawn to the Normativ

26、e 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 responsib

27、le for identifying any or all such patent rights. International Standard IEC 61747-20-2 has been prepared by IEC technical committee 110: Electronic display devices. This first edition cancels and replaces Clause 5 of the first edition of IEC 61747-5 published in 1998. This edition constitutes a tec

28、hnical revision. This edition includes the following significant technical changes with respect to the previous edition: a) editorial modification was done in accordance with the ISO/IEC Directives, Part 2; b) document number was changed to align with the new numbering structure of the IEC 61747 ser

29、ies. 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 in Annex D of IEC 61747-30-1:2012. 4 IEC 61747-20-2:2015 IEC 2015 The text of this standard is based on the following documents: FD

30、IS Report on voting 110/638/FDIS 110/654/RVD Full information on the voting for the approval on 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. A list of all parts in the IEC 61747 s

31、eries, 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 the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to t

32、he 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. IEC 61747-20-2:2015 IEC 2015 5 INTRODUCTION This part of IEC 61747 facilitates the visual inspectio

33、n of image defects of monochrome matrix LCD modules by the human eye subjectively. Visual inspection is performed at specified conditions and criteria. The objective measurement method of visual image defects with an instrument will be studied and standardized. 6 IEC 61747-20-2:2015 IEC 2015 LIQUID

34、CRYSTAL DISPLAY DEVICES Part 20-2: Visual inspection Monochrome matrix liquid crystal display modules (excluding all active matrix liquid crystal display modules) 1 Scope This part of IEC 61747 gives the details of the quality assessment procedures and provides general rules for the visual inspectio

35、n of the non-active and active areas of monochrome matrix liquid crystal display modules by the human eye and, if necessary, through an optical microscope. Furthermore this standard includes the defect definitions and the method for visual defect inspection. NOTE Restrictions on defect types, number

36、 and sizes are specified in the quality contract (customer acceptance specification and incoming inspection specification) between the panel and set makers. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its

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

38、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 apply. 3

39、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, 1.4.3. 4.1.1.2 Humidity All

40、 visual inspection shall be carried out under specified humidity. Refer to IEC 61747-10- 2:2014, 1.4.3. IEC 61747-20-2:2015 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 shall be ad

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

42、d 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 Inspector a

43、nd 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 shall carr

44、y out the visual inspection based on the specified procedure and record the result 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 The test conditions of visual inspection shall be described for the fo

45、llowing conditions: viewing direction range; illumination from above or through the device (depending on the application); duration; viewing distance; ambient temperature. 4.2.1.2 Procedure The devices shall be inspected for the following visual defects as described in Table 1. 8 IEC 61747-20-2:2015

46、 IEC 2015 Table 1 Defects and criteria when display not activated Defects Rejection criteria Spots (see Figure 1), bubbles, foreign particles; light/dark stains on light background, light/dark stains on dark background To be specified in the detail specification Scratches on the liquid crystal cell

47、and on the polarizer within the specified viewing direction range To be specified in the detail specification Mechanical damage outside of the viewing area To be specified in the detail specification Accumulation of the above-listed visible defects To be specified in the detail specification Visible

48、 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 A = bezel B

49、 = viewing area C = defect h = height w = width Figure 1 Defects within the viewing area IEC B A C w h IEC 61747-20-2:2015 IEC 2015 9 4.2.2 Display activated 4.2.2.1 Overall geometrical aspect of the display (see Figures 2 and 3) 4.2.2.1.1 General The defects of the geometrical aspect are shown in Figures 2 and 3. Figure 2 Deviations and mis-shapes of a square picture element Figure 3 Notched edges of picture elements 4.2.2.1.2 Test conditions The test condit