Iec 61988-2-6-2015.Pdf

IEC 61 988 2 6 Edition 1 0 201 5 03 INTERNATIONAL STANDARD Plasma display panels – Part 2 6 Measuring methods – APL dependent gamma and colour characteristics IE C 6 1 9 8 8 2 6 2 0 1 5 0 3 (e n ) ® c[.]

IEC 61 988- 2- 6

Edit io 1.0 2 15-0

Plasma display panels –

Part 2- 6: Measuring met hods – A PL dependent gamma and colour

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IEC 61988- 2- 6

Edit io 1.0 2 15-0

Plasma display panels –

Part 2- 6: Measuring met hods – A PL dependent gamma and colour

CONTENTS

FOREWORD 4

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 7

4 Me s rement eq ipment

7 4.1 Vide sig al generator 7

4.2 Non-contact LMD (l g t me s rement device) 7

4.3 Contact LMD 7

5 Me s rement con ition

7 5.1 General 7

5.2 Setup con ition 7

5.3 Me s rin layout 8

5.4 Input sig al level an picture level 9

6 Me s rin method of tone c aracteristic 10 6.1 Purp se 10 6.2 Input sig als 1

6.2.1 General 1

6.2.2 1 -ste grey b r with fi ed APL 1

6.2.3 Sin le grey win ow with f i ed APL 12 6.2.4 1 -ste RGB b r an sin le colour win ow with f i ed APL 13 6.3 Me s rin proced re 14 6.4 Expres ion of es lts 15 6.4.1 Me s rement re ort 15 6.4.2 Gamma calc lation 16 7 Me s rin method of colour gamut by APL 19 7.1 Purp se 19 7.2 Primary an secon ary colour p tern by APL 19 7.3 Me s rin proced re 19 7.4 Evaluation of colour ac urac 2

7.5 Evaluation of colour gamut 2

7.6 Expres ion of es lts 21 An ex A (informative) Use of ITU-R Rec BT.7 9-5 sig al 2

Bibl ogra h 2

Fig re 1 − Meas rin layout for non-contact me s rement 8

Fig re 2 − Meas rin layout for contact me s rement 9

Fig re 3 – Input sig als an sig al proces in in a PDP mod le 10

Fig re 4 – An example of an 1 -ste grey-b r p tern 12

Fig re 5 – Example of 4 % win ow p t ern for me s rin the tone c aracteristic 12

Fig re 6 − RGB b r an sin le win ow p t ern 13

Fig re 7 − An example of res lts of gamma c aracteristic for e c APL 15

Fig re 8 − Example plots f or calc lated gamma values by APL 17

Fig re 9 − Example plots f or CCT c aracteristic by APL 18

Fig re 10 − Example plots f or ∆u’v’ c aracteristic by APL 18

Fig re 14 − The me s red colour gamut plots by APL 2

Ta le 1 − An example of a tone me s rement re ort 15

Ta le 2 − Example of gamma re ortin form (for e c APL ) 17

Ta le 3 – An example of gamut are s for evaluation of colour gamut 21

Ta le 4 − An example of primary an secon ary colour me s rement re ort 2

Ta le A.1 – Digital data an sig al level in ITU-R Rec BT.7 9-5 2

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International Stan ard IEC 619 8-2-6 has b en pre ared by IEC tec nical commite 1 0:

Electronic display devices

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

Ful information on the votin for the a proval of 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 the p rts in the IEC 619 8 series, u der the general title P la ma dis lay p n ls,

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 u der "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

IMPORTANT – The 'colour in ide' logo on the cov r pa e of this publ c tion indic te

that it contains colours whic are consid re to be u ef ul f or the cor e t

understa ding of its conte ts Us rs s ould theref ore print this doc me t using a

colour printer

PLASMA DISPLAY PANELS –

Part 2-6: Measuring methods –

This p rt of IEC 619 8 def i es the me s rin method f or gamma an colour gamut

c aracteristic as a f un tion of the APL f or a PDP module (plasma display mod le) General y,

the luminan e level of a PDP mod le is de en ent on the APL (average picture level) of input

images Varyin the input levels cau es a c an e of the c romaticity of RGB primary colours

This stan ard also def i es the me s rin method of tone c aracteristic an c romaticity

c aracteristic with varying APLs This stan ard is b sed on the as umption that the in

erse-gamma circ it is in ide the mod le

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

are in isp n a le f or 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 6 0 8-1, Enviro me tal testing – P art 1: Ge eral a d g idan e

tra smis io s − P art 1: Ge eral c n ideratio s − Mea ureme ts at radio a d vid eo

IEC 619 6-5, M ultimedia s stem a d e uipme t – Colo r me s reme t a d ma a eme t –

P art 5: Equipme t u in plasma dis lay p n ls

IEC 619 8-1, P lasma d is la p n ls – P art 1: Terminolo y a d letter s mb ls

IEC 619 8-2-1, P lasma dis lay p n ls − P art 2-1: M ea urin methods − Optic l a d

o to lectric l

CIE 15:2 0 , Colorimetry

intern tio al pro ramme ex ch n e

3.1.2

colour dif f ere c

dif feren e b twe n two colour stimul , def i ed as the Eu l de n distan e b twe n the p ints

re resentin them in a sp cif i colour sp ce s c as CIE 19 6 u’v’ colour sp ce

For the purp ses of this doc ment, the fol owin a breviation a ply

APL Average picture level

CCT Cor elated colour temp rature

LMD Lig t me s rin device

PDP Plasma display

4.1 Video signal ge erator

An analog e vide sig al generator or a digital vide sig al generator is u ed The sig al

c aracteristic s al matc with the me s red PDP mod le Input sig al, in this doc ment,

4.2 Non-conta t LMD (l ght me s reme t de ic )

When u in a non-contact LMD, the non-contact LMD in orp rates a sp ctroradiometer or a

non-contact colorimeter as s own in Fig re 1 The detai con ition are def i ed in

IEC 619 8-2-1, where a non-contact LMD is des rib d as an LMD

NOT : Se IEC 619 6-5

4.3 Conta t LMD

When u in a contact LMD, the me s rement pro e s al b placed p rp n ic lar to the

display s rface an in lu e at le st 5 0 pixels in the me s rement a erture It s al b

con rmed that the res lts me s red by the contact LMD are the same as the res lts

me s red by the non-contact LMD

5 Measurement conditions

The f ol owin stan ard setup con ition s al b u ed Eac con ition s al b noted on the

relevant sp cif i ation whenever an dif f erent con ition other than the stan ard setup

con ition are a pled (Se the me s rin con ition in IEC 619 6-5 an IEC 619 8-2-1.)

5.2 Setup condition

Al me s rements s al b car ied out in a dark ro m Il uminan e s al b les than 1 lx

an where on the s re n of the PDP mod le When this i uminan e sig if i antly af f ects the

me s rement of the blac level, the b c grou d s btraction method s al b u ed When a

dif ferent i uminan e or the b c grou d s btraction method is u ed, this s al b noted on the

re ort

The warm-up time s al b lon er than 3 min tes with a sig al input set at 15 % grey level

on ful s re n without gamma cor ection, u les other sp cif ied me s rin method are u ed

When dif ferent warm-up con ition are u ed, they s al b noted on the re ort

For the me s rement of tone c aracteristic , the con ition of contrast an colour

en an ement f un tion to preserve the tone c aracteristic of the p nel itself s al b a pl ed

an noted on the re ort The image stic in preventin f un tion (f or a sti image) s al b

turned of f , or some proced res in whic the fun tion is ke t inactive can b a pl ed

5.3 Me s ring la out

The me s rin eq ipment s al b set as s own in Fig re 1 f or a non-contact LMD an in

Fig re 2 for a contact LMD The o tical axis of the non-contact LMD s ould b normal to the

centre of the display s rface It is recommen ed that the me s rin distan e ℓ of LMD is

2,5V, where Vis the ef fective s re n heig t of the display

Fig re 1 − Me s rin layout f or non-conta t me s reme t

The me s rin layout f or a contact LMD is s own in Fig re 2 A me s rement pro e s al b

set to the s rface of the display

IEC

LMD

PDP mo ule

Me surin dista cℓ

Figure 2 − Me s rin la out f or conta t me s reme t

5.4 Input signal le el a d picture le el

For the me s rement, analog e vide sig als or digital video sig als are u ed as input

sig als The input sig al level is the level of the analog e vide sig al an is in icated in

p rcent (0 % to 10 %, I

%

to I

10 %resp ctively), whi e the con entional digital input data is

the level of the digital input vide sig al havin a value from 0 to 2

N

-1, where N is the n mb r

of the bits f or the digital vide sig al When N is 8, 2 6 grey ste s are u ed Basical y these

input vide sig als are pre-gamma sig als havin an a pl ed gamma cor ection of 2,2 The

output luminan e level is related to 2,2

th

p wer of the input sig al level The term picture level,

whic relates to luminan e, is u ed f or the output luminan e level of the p st-gamma sig al

Fig re 3 s ows these relation hips

NOT In th ITU-R Re B 7 9-5 8-bit digital vid o sig al th digital d ta is c mpre s d to 16 to 2 5 fom 0 to

2 5 Th in ut sig al at le el 0 % is th digital d ta of 16 a d th in ut sig al at le el 10 % is th digital d ta of

2 5 Th in ut digital d ta is mo ifie to this relatio s ip a s own in An e A In this d c me t th pro e ure of

th c n e tio al digital sig al is mainly me tio e

a For th u e of th ITU-R Re B 7 9-5 8-bit digital sig al th relatio s ip b twe n th in ut sig al le el a d

th digitald ta is a folows:

I = (D- 6)/(2 5- 6) × 10 (%)

Figure 3 – Input signals a d signal proc s in in a PDP module

6 Measuring methods of tone c aracteristics

The purp se of this method is to me s re the tone c aracteristic of a PDP as a f un tion of

the APL The f ol owin items are then me s red:

a) APL de en ent gamma c aracteristic ,

b) sig al level an APL de en ent CCT (cor elated colour temp rature), an

c) sig al level an APL de en ent c romaticity co rdinates (u’v’

NOT u' a d v' are CIE 19 6 U S dia ram c ordin te d fin d in CIE 15

6.2 Input signals

To me s re the tone c aracteristic with a f i ed APL, a n mb r of APLs to b evaluated s al

s ould b a pl ed When other APLs or level selection are u ed, the levels s al b noted in

the re ort Four kin s of sig als f or me s rement of the tone c aracteristic are as f olows;

a) 1 -ste grey b r with fi ed APL,

b) sin le grey win ow with f i ed APL,

c) 1 -ste RGB b r with f i ed APL,

d) sin le colour win ow with f i ed APL

6.2.2 1 -step gre bar with fix d APL

The detai s of the sig al are as f ol ows:

a) The input sig al of the 1 -ste grey-b r p tern is a pl ed The p tern have 1 win ows

an the sig al levels of the win ows, I

%

to I

10 %, are at 0 %, 10 %, 2 %, 3 %, 4 %,

5 %, 6 %, 7 %, 8 %, 9 % an 10 % resp ctively, or in 8-bit digital input data at 0,

2 , 51, 7 , 10 , 12 , 15 , 17 , 2 4, 2 0 an 2 5 resp ctively In the me s rement the

win ow at the me s rin sig al level is moved to the s re n centre an e c of the

remainin 10 u u ed grey p tern b rs s al b displayed either in the to or the b tom

groups of the 5 b rs as s own in Fig re 4 Fig re 4 s ows ju t an example of 1 grey-b r

p t ern F r the me s rement of other sig al levels, a simple proced re in whic the

sig al levels of the centre win ow an one of remainin 10 grey b rs are ex han ed may

b a pl ed If the are of e c b r in grey p t ern is 0,9 % of the whole s re n are , then

the whole grey-b r are is 10,7 % (0,9 % × 1 ) Therefore, the b c grou d are is

8 ,2 % (10 % − 10,7 %)

b) The b c grou d level s al b c an ed to maintain the APL

c) In Fig re 4, the average picture level of the 1 -ste grey-b r sig al is calc lated

con iderin the con entional 2,2 gamma con ersion as fol ows:

APL(%) = 10,7 × 0,3 0 6+ 8 ,2 × (D

BK/ 2N

is an input digital data f or b c grou d in an N-bit s stem

an is calc lated as f ol ows:

D

BK

= (2N

B ,G

a d D

B ,B for th b c gro n in ut digital d ta are a

The detai s of the sig al are as fol ows

a) A sin le win ow p t ern is u ed to me s re the tone c aracteristic of the PDP as s own

in Fig re 5 The win ow is generated with e c grey input data to b me s red, an the

b c grou d s al b c an ed to maintain a sp cifi APL of the total s re n are whi e

digital in ut d ta of 4 % gre win ow

Figure 5 – Ex mple of 4 % win ow pat ern f or me s ring the tone c ara teristic

b) A 1/5 horizontal an vertical sized win ow, a proximately 4 % of the total s re n are , is

Ba k ro n (D

B)

IEC

APL(%) of p tern = 4 × (D

M/ 2N

-1)),2

+ 9 × (D

BK/ 2N

-1)),2

M,G

a d

D

M,B, a dD

B ,R, D

–1) × ((APL(%)− × (D

M/ 2N

6.2.4 1 -step RGB bar a d single colour win ow with fix d APL

The detai s of the sig al are as f ol ows:

a) A b r or sin le win ow p t ern for e c RGB primary is also generated an me s red as

s own in Fig re 6

a) R-b r, G-b r a d B-b r win ow with v ryin in ut le els

b) 4 % R, G a d B sin le win ow with v ryin in ut le els

Fig re 6 − RGB bar a d single window pat ern

b) The input digital data f or b c grou d D

-1) × ( ( APL(%)−10,7 × (0,3 0 6) 3 ) 8 ,2 )

1/2,2

(5)

c) For the input digital data f or the b c grou d of the R, G an B sin le win ow p tern

s own in Fig re 6 b), the f ol owin eq ation (6), (7), an (8) are u ed

D

BK

= (2N

-1) × ((APL(%)− × (D

R/ 2N

-1)2,2

-1) × ((APL(%)− × (D

G/ 2N

-1)2,2

-1) × ((APL(%)−4 × (D

B/ 2N