Iec 61747 20 2 2015

IEC 61 747 20 2 Edition 1 0 201 5 03 INTERNATIONAL STANDARD Liquid crystal display devices – Part 20 2 Visual inspection – Monochrome matrix l iquid crystal display modules (excluding all active matri[.]

IEC 61747- 20- 2

Edit io 1.0 2 15-0

Liquid cry stal display devices –

Part 20- 2: Visual inspect ion – Monochrome mat rix l quid cry st al display modules

(ex cluding al act iv e mat rix l quid cry st al display modules)

®

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IEC 61 747- 20- 2

Edit io 1.0 2 15-0

Liquid cry stal display dev ices –

Part 20- 2: Visual inspect ion – Monochrome mat rix l quid cry st al display modules

(ex cluding al activ e mat rix l quid cry stal display modules)

INT R NATIONAL

ELECTR OT C NICAL

®

W arnin ! Ma e s re th t you o tain d this publ c tion from a a thorize distributor

CONTENTS

FOREWORD 3

INTRODUCTION 5

1 Sco e 6

2 Normative ref eren es 6

3 Terms, def i ition an a breviation 6

3.1 Terms an def i ition 6

3.2 Ab reviation 6

4 Vis al in p ction method an criteria 6

4.1 Stan ard in p ction con ition an method 6

4.1.1 Ambient con ition 6

4.1.2 In p ction eq ipment an l q id cry tal display mod les 7

4.1.3 In p ctor an l mit sample f or vis al in p ction 7

4.1.4 In p ction an record of res lt 7

4.2 Vis al in p ction of display 7

4.2.1 Display not activated 7

4.2.2 Display activated 9

Bibl ogra h 13 Fig re 1 – Def ects within the viewin are 8

Fig re 2 – Deviation an mis-s a es of a s uare picture element 9

Fig re 3 – Notc ed ed es of picture elements 9

Fig re 4 – Def ects within the elements an their s r ou din s 10 Ta le 1 –Def ects an criteria when display not activated 8

Ta le 2 – Pro erties an criteria when display activated 10

Ta le 3 – Def ects an criteria when display activated 10

Ta le 4 – Def ect an criteria of viewin are 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION

Part 20-2: Visual inspection – Monochrome matrix l quid crystal display

modules (excluding al active matrix l quid crystal display modules)

1 Th Intern tio al Ele trote h ic l Commis io (IEC) is a worldwid org niz tio for sta d rdiz tio c mprisin

al n tio al ele trote h ic l c mmite s (IEC Natio al Commite s) Th o je t of IEC is to promote

intern tio al c -o eratio o al q e tio s c n ernin sta d rdiz tio in th ele tric l a d ele tro ic f i ld To

this e d a d in a ditio to oth r a tivitie , IEC p bls e Intern tio al Sta d rd , Te h ic l Sp cif i atio s,

Te h ic l Re orts, Pu lcly Av ia le Sp cific tio s (PAS) a d Guid s (h re fter refere to a “IEC

Pu lc tio (s)”) Th ir pre aratio is e tru te to te h ic l c mmite s; a y IEC Natio al Commite intere te

in th s bje t d alt with ma p rticip te in this pre aratory work Intern tio al g v rnme tal a d n

n-g v rnme tal org niz tio s laisin with th IEC als p rticip te in this pre aratio IEC c la orate clo ely

with th Intern tio al Org niz tio for Sta d rdiz tio (ISO) in a c rd n e with c n itio s d termin d b

a re me t b twe n th two org niz tio s

2) Th formal d cisio s or a re me ts of IEC o te h ic l maters e pre s, a n arly a p s ible, a intern tio al

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intere te IEC Natio al Commite s

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misinterpretatio b a y e d u er

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th later

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in is e s ble f or th c re t a plc tio of this p blc tio

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International Stan ard IEC 617 7-2 -2 has b en pre ared by IEC tec nical commite 1 0:

Electronic display devices

This f irst edition can els an re laces Clau e 5 of the f irst edition of IEC 617 7-5 publ s ed in

19 8 This edition con titutes a tec nical revision

This edition in lu es the f ol owin sig if i ant tec nical c an es with resp ct to the previou

edition:

a) editorial modif i ation was done in ac ordan e with the ISO/IEC Directives, Part 2;

IEC 617 7 series

NOT It is inte d d th t th oth r cla s s of IEC 617 7-5:19 8 wi b re la e b n w p rts in th IEC 617 7

s rie Th d tais of th inte d d c a g s are giv nin An e D of IEC 617 7-3 - :2 12

The text of this stan ard is b sed on the fol owin doc ments:

Ful information on the votin f or the a proval on this stan ard can b f ou d in the re ort on

votin in icated in the a ove ta le

This publcation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 617 7 series, publ s ed u der the general title Liq id cry tal

dis lay de ic s, can b f ou d on the IEC we site

The commit e has decided that the contents of this publcation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site un er "htp:/we store.iec.c " in the data

related to the sp cifi publ cation At this date, the publ cation wi b

• with rawn,

• re laced by a revised edition, or

A bi n ual version of this publ cation may b is ued at a later date

This p rt of IEC 617 7 faci tates the vis al in p ction of image defects of monoc rome matrix

LCD mod les by the h man eye s bjectively Vis al in p ction is p rformed at sp cif ied

con ition an criteria The o jective me s rement method of vis al image defects with an

in trument wi b stu ied an stan ardized

LIQUID CRYSTAL DISPLAY DEVICES –

Part 20-2: Visual inspection – Monochrome matrix l quid crystal display

modules (excluding al active matrix l quid crystal display modules)

This p rt of IEC 617 7 gives the detai s of the q al ty as es ment proced res an provides

general rules for the vis al in p ction of the non-active an active are s of monoc rome

matrix l q id cry tal display mod les by the h man eye an , if neces ary, throu h an o tical

micros o e Furthermore this stan ard in lu es the defect defi ition an the method f or

vis al defect in p ction

NOT Re trictio s o d fe t ty e , n mb r, a d siz s are s e if i d in th q alty c ntra t (c stomer a c pta c

s e ific tio a d in omin in p ctio s e if i atio ) b twe n th p n l a d s t ma ers

The f olowin doc ments, in whole or in p rt, are normatively ref eren ed in this doc ment an

are in isp n a le for its a pl cation For dated ref eren es, only the edition cited a pl es For

u dated ref eren es, the latest edition of the referen ed doc ment (in lu in an

IEC 617 7-1-2:2 14, Liq id cry tal dis lay de ic s – P art 2: Termin log a d letter s mb ls

IEC 617 7-10-2:2 14, Liq id cry tal dis lay devic s – P art 10-2: En iro me tal, e dura c

a d me h nical te t meth ds – Enviro me tal a d en uran e

3 Terms, def initions and a bre iations

3.1 Terms a d def initions

For the purp ses of this doc ment, the terms, def i ition an leter s mb ls given in

IEC 617 7-1-2 an IEC 617 7-10-2 a ply

DUT Device u der test

4 Visual inspe tion method and criteria

4.1 Sta dard inspe tion conditions a d methods

4.1.1 Ambie t conditions

4.1.1.1 Temperature

IEC 617 7-10-2:2 14, 1.4.3

4.1.1.2 Humidity

Al vis al in p ction s al b car ied out u der sp cif ied h midity Refer to IEC 617 7-1

0-2:2 14, 1.4.3

4.1.1.3 I lumina c

Al vis al in p ction s al b car ied out u der i umination levels as sp cif ied in the detai

sp cif i ation The i umination level s al b adju ted in s c a way that it al ows f or an

ac urate vis al in p ction

4.1.2 Inspe tion e uipme t a d l q id cry tal displa module

The DUT wi b in tal ed on a rotata le f i ture to ena le c an es in the horizontal an

vertical viewin direction ran e Alternatively, the in p ctor moves arou d an the DUT is

fi ed

Turn on the direct c r ent p wer s p ly an p t ern generator an warm up f or sta i zation

Sup ly the drivin voltage an p tern to the DUT The warm-up time of the DUT s al b

s f f iciently lon to o tain a sta le sig al, neces ary f or the vis al in p ction

4.1.3 Inspe tor a d l mit s mple f or vis al in pe tion

The in p ctor s al have a (cor ected-to) normal vision, a normal colour vision an s al b

p riodical y trained with sp cified lmit samples in order to ac urately car y out the vis al

examination

4.1.4 Inspe tion a d re ord of re ult

The in p ctor s al car y out the vis al in p ction b sed on the sp cif ied proced re an

record the res lt on recordin s e ts with the sp cif ied in p ction con ition

4.2 Vis al inspe tion of displa

4.2.1.1 Te t con itions

The test con ition of vis al in p ction s al b des rib d for the fol owin con ition :

– viewin direction ran e;

– i umination from a ove or throu h the device (de en in on the a pl cation);

– d ration;

– viewin distan e;

– ambient temp rature

4.2.1.2 Proc d re

The devices s al b in p cted f or the f ol owin vis al def ects as des rib d in Ta le 1

Table 1 –Def ects a d criteria whe displa not a tiv te

Sp ts (s e Fig re 1 , b b le , foreig p rticle ; lg td rk stain o lg t

b c gro n , lg td rk stain o d rk b c gro n

To b s e ifie in th d tai

s e ific tio

Scratc e o th lq id cry tal c l a d o th p lariz r within th

s e ifie viewin dire tio ra g

To b s e ifie in th d tai

s e ific tio

s e ific tio

s e ific tio

Visible stru ture of th ele tro e within th viewin are Refere c s mple

No -u iformity of lumin n e a d c lo rs within th viewin are of th

dis la a d within th s e if i d viewin dire tio ra g

Refere c s mple

A = b z l

B = viewin are

C = d fe t

h = h ig t

w = width

Fig re 1 – Def ects within the viewing are

IEC

w

4.2.2 Displa a tiv te

4.2.2.1 Ov ral geometric l a pe t of the displa (s e Figure 2 a d 3)

The def ects of the ge metrical asp ct are s own in Fig res 2 an 3

Figure 2 – De iations a d mis-s ape of a s u re picture eleme t

Fig re 3 – Notc e e ge of picture eleme ts

4.2.2.1.2 Te t conditions

The test con ition of vis al in p ction f or the display activated s al b des rib d f or the

fol owin con ition :

– electrical drivin con ition ;

– i umination;

– ambient temp rature

IEC IEC

4.2.2.1.3 Proc dure

Devices s al b in p cted in conf ormity with the detai sp cifi ation in Ta les 2 an 3

Table 2 – Pro ertie a d criteria whe displa a tiv te

Dime sio of picture eleme ts

Sh p of picture eleme ts

Not in c nf ormity with th

d tai s e if i atio

Not in c nf ormity with th

d tai s e if i atio

Table 3 – Def ects a d criteria wh n displa a tiv te

Mis in picture eleme ts

Unwa te picture eleme ts

Activ tio of th picture eleme ts

Se l e g within viewin are

Not in c nformity with th

d tai s e if i atio

Not in c nf ormity with th

d tai s e if i atio

Not in c nf ormity with th

d tai s e if i atio

Not in c nf ormity with th

d tai s e if i atio

4.2.2.2 Visible def ect of th viewing are

The def ects of the viewin are are s own in Fig re 4

h =h ig t

w = width

Figure 4 – Def ects within the eleme ts a d th ir s r ou din s

IEC

w

w

w