Iec 62906 1 2 2015

IEC 62906 1 2 Edition 1 0 201 5 07 INTERNATIONAL STANDARD Laser display devices – Part 1 2 Vocabulary and letter symbols IE C 6 2 9 0 6 1 2 2 0 1 5 0 7 (e n ) ® colour inside Copyright International E[.]

IEC 62906- 1 - 2

Editio 1.0 2 15-0

Laser display devices –

Part 1- 2: V ocabulary and let t er symbols

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IEC 62906- 1 - 2

Edit io 1.0 2 15-0

Laser display devices –

Part 1- 2: V ocabulary and let t er symbols

INT ER NAT IONAL

ELECT R OT ECHNICAL

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W arnin ! Mak e s re th t you o tain d this publ c t ion from a a thorize dist ribut or

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FOREWORD 3

1 Sco e 5

2 Terms, def i ition , an a breviation 5

2.1 Clas ification of terms 5

2.2 Fu damental terms 5

2.3 Terms related to sp c le 5

2.4 Terms related to display category 7

2.5 Terms related to o tical devices 7

2.6 Terms related to l g t sources 8

3 L ter s mb ls (q antity s mb ls / u it s mb ls) 8

An ex A (informative) Categorization of sp c le an sp c le contrast ratio 9

A.1 Objective sp c le 9

A.2 Subjective sp c le 9

A.3 Sp c le contrast ratio 10 Biblogra h 12 Fig re A.1 – Optical con g ration to o serve objective sp c le 9

Fig re A.2 – Optical con g ration to o serve s bjective sp c le 10 Fig re A.3 – Clas ification ma of spec le 10 Ta le 1 – L ter s mb ls 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION

LA SER DISPLA Y DEVICES –

Part 1-2: Vocabulary and let er symbols

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

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International Stan ard 6 6 1-1-2 has b en pre ared by IEC tec nical commit e 1 0:

Electronic display devices

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

Ful inf ormation on the votin f or the a proval of this stan ard can b foun in the re ort on

votin in icated in the a ove ta le

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

A lst of al p rts in the IEC 6 9 6 series, publ s ed u der the general title L ser displ ay

devic s, can b f ou d on the IEC we site

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

the sta i ty date indicated on the IEC we site u der "ht p:/we store.iec.c " in the data

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

• reconfirmed,

• with rawn,

• re laced by a revised edition, or

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

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

th t it contains colours whic are considere to be us f ul f or the cor e t

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

colour printer

LA SER DISPLA Y DEVICES –

Part 1-2: Vocabulary and let er symbols

This p rt of IEC 6 9 6 gives the pref er ed terms, their definition an s mb ls for laser

display devices an relevant comp nents with the o ject of u in the same terminolog when

publ cation are pre ared in diff erent cou tries

2 Terms, def initions, and abbreviations

For the purp ses of this doc ment, the fol owin terms an definition a ply

2.1 Cla sif ic tion of terms

Terms f or laser display devices an relevant comp nents are clas if ied as folows:

a) fu damental terms;

b) terms related to sp c le;

c) terms related to display category;

d) terms related to o tical devices;

e) terms related to l g t sources

2.2 Fu dame tal terms

2.2.1

la er displa de ic

LDD

display device u in a laser or lasers, b sed on stimulated emis ion

2.2.2

hybrid la er displa de ic

hybrid LDD

h-LDD

display device u in b th a laser or lasers an sp ntane u emis ion-b sed l g t sources

2.3 Terms relate to spe kle

2.3.1

spe kle

<laser display devices> ir eg larly al g ed sp tial y-mod lated image cre ted by coherent or

p rtial y coherent l g ts as a res lt of inter eren e on a sen or plane of the vis al sen ory

s stem of the o server

Note 1 to e try: For a h ma o s rv r, th s n or pla e of th vis al s n ory s stem is th retin of th e e

2.3.2

sp c le when the l g t source is monoc romatic or q asi-monoc romatic

2.3.3

colour spe kle

sp c le when the l g t source is multi-coloured

2.3.4

spe kle pat ern

i uminan e distribution of sp c le

2.3.5

spe kle contra t ratio

spe kle contra t

SCR

C

s

ratio of the i uminan e stan ard deviation to the average of the sp c le p t ern in the

me s rement f ield

Note 1 to e try: Se Cla s A.3 for f urth r informatio

[SOURCE: J.W GOODMAN, Sp ck le Ph n me a in Optics: Th ory a d Ap l i at io s

(Ro erts an Comp n Publ s ers, Colorado, 2 0 )]

2.3.6

sign l to nois ratio

< sp c le-oriented noise in erse of the sp c le contrast ratio

2.3.7

obje tive spe kle

sp c le o served by an o tical sen ory s stem without imagin o tic

Note 1 to e try: Se Cla s A.1 for f urth r informatio

[SOURCE: M KURASHIGE et al Th eval uat io of sp ckle c ntrast with v riabl e sp ck le

g n rat or, J Soc Inf o Display 19/9, 6 1-6 8 (2 1 )]

2.3.8

sp c le o served by a vis al sen ory s stem with imagin o tic

Note 1 to e try: Se Cla s A.2 for f urth r informatio

[SOURCE: M KURASHIGE et al Th eval uat io of sp ckle c ntrast with v riabl e sp ck le

g n rator, J Soc Info Display 19/9, 6 1-6 8 (2 1 )]

2.3.9

proje te spe kle

s bjective sp c le arisin fom a projected interf eren e p t ern cre ted by coherent or

p rtial y coherent l g t on a s re n

Note 1 to e try: Se Cla s A.2 for f urth r informatio

[SOURCE: M KURASHIGE et al “Clas ific tion of su jective sp ckle for eval uat io of laser

d isplay”, SID Symp sium Digest 4 , 419-4 2 (2 14)]

2.3.10

s re n spe kle

s bjective sp c le arisin fom the s at erin or dif fu ion of coherent or p rtial y coherent

l g t on a s reen

Note 1 to e try: Se A.2 for furth r inf ormatio

[SOURCE: M KURASHIGE et al “Clas ific tion of su jective sp ckle for eval uat io of laser

d isplay”, SID Symp sium Digest 4 , 419-4 2 (2 14)]

spe kle grain size

sp cin of interf eren e f rin es generated by coherent or p rtial coherent b ams on a sen or

plane of a vis al sen ory s stem

2.3.12

minimum o je tiv spe kle grain size

s

o j

minimum sp cin of interf eren e f rin es whic is determined by the interf eren e of two

coherent b ams f rom the o p site ed es of the i uminated are to the sen or plane

Note 1 to e try: Se Cla s A.1 for f urth r informatio

2.3.13

minimum s bje tiv spe kle grain size

s

u j

minimum sp cin of intereren e fin es whic is determined by the inter eren e of two

coherent b ams f rom the o p site ed es of the eff ective diameter of imagin o tic to the

sen or plane

Note 1 to e try: Se Cla s A.2 for f urth r informatio

2.4 Terms relate to displa c te ory

2.4.1

image projection (on a s re n or a projection plane) by raster s an in laser b ams

2.4.2

f ul - rame proje tion

image projection (on a s re n or a projection plane) by a 2D sp tial lg t mod lator

2.4.3

l ne-s a ne proje tion

image projection (on a s re n or a projection plane) by a combination of a 1D sp tial l g t

mod lator an a 1D o tical s an er

2.4.4

f ront proje tion

image projection (on a s re n or a projection plane) f rom the same side as the o server

2.4.5

re r proje tion

image projection (on a s re n or a projection plane) f om the side o p site to that of the

o server

2.4.6

retina dire t proje tion

image projection directly on the retina

2.5 Terms relate to optic l de ic s

2.5.1

proje tion s re n

proje tion pla e

plane on whic an image is projected an o served as diff used l g t

2.5.2

l quid cry tal on si con

LCOS

sp tial l g t mod lator to cre te images, b sed on l q id cry tal fa ricated on a si con wafer

2.5.3

digital mir or d vic

digital micromir or d vic

DMD

sp tial l g t mod lator to cre te images by switc in a Micro Electro Mec anical Sy tems

(MEMS) mir or ar ay

2.6 Terms relate to l ght sourc s

2.6.1

s con harmonic ge eration la er

SHG la er

coherent or p rtial y coherent l g t source of whic photon energy is up-con erted to twice

that of the pump laser throu h the secon harmonic generation proces

3 Let er symbols (quantity symbols / unit symbols)

Se Ta le 1

Table 1 – Let er s mbols

C

s

Sp c le c ntra t ratio

s

o j

Minimum o je tiv s e kle grain siz (m)

s

ubj

Minimum s bje tiv s e kle grain siz (m)

Annex A

(inf or mative)

Categorization of speckle and speckle contrast ratio

A 1 Objective speckle

Objective sp c le is recog ized as a sp c le p tern on a sen or plane without any imagin

o tic Fig re A.1 s ows an o tical config ration for explainin o jective sp c le an its

sen in method In this case, a sen or ar ay is simply set at the sen or plane

Figure A.1 – Optic l conf iguration to obs rve obje tiv spe kle

The stru ture of o jective sp c le de en s on the s rf ace state of the s re n, the i uminated

are on the s re n, an the distan e b twe n the s re n an the sen or plane Minimum

o jective sp c le grain size s

o j

is defined as the minimum sp cin of intereren e f rin es

generated by interf eren e of two coherent b ams f rom the o p site ed es of the i uminated

are Minimum o jective sp c le grain size, s

o j

is o tained by the fol owin eq ation

o j

o j

sin

λ

=

where

λ is the wavelen th of the coherent b am;

θ

o j

is the half an le b twe n two coherent b ams f rom o p site ed es of the i uminated

are

The size of the i uminated are an the distan e b twe n the sen or ar ay an the s re n

s ould b careful y c osen to resolve the o jective sp c le stru ture s ff i iently

A 2 Subjective speckle

Subjective sp c le is recog ized as a sp c le p t ern on a sen or plane throu h imagin

o tic An o tical con g ration for explainin the s bjective sp c le an its sen in method is

s own in Fig re A.2 In this case, a camera, implyin an imagin s stem con istin of the

sen or ar ay an imagin len es, is u ed as a sen in device For simpl city, a sin le-len

s stem re resents the imagin s stem in Fig re A.2

The minimum sp c le stru ture de en s on local zed s rf ace stru ture of the s re n an the

an ular a erture of imagin len Therefore, minimum s bjective sp c le grain size s

s bj is

θ

o j

I umin te are

Se s r pla e

Se s r ar a

L s r b am