1、BSI Standards PublicationLaser display devicesPart 1-2: Vocabulary and letter symbolsBS IEC 62906-1-2:2015National forewordThis British Standard is the UK implementation of IEC 62906-1-2:2015. The UK participation in its preparation was entrusted to TechnicalCommittee EPL/47, Semiconductors.A list o
2、f organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limite
3、d 2015ISBN 978 0 580 86279 3ICS 31.260Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2015. Amendments/corrigenda issued since publicationDate Text affecte
4、dBRITISH STANDARDBS IEC 62906-1-2:2015IEC 62906-1-2 Edition 1.0 2015-07 INTERNATIONAL STANDARD Laser display devices Part 1-2: Vocabulary and letter symbols INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.260 ISBN 978-2-8322-2779-4 Registered trademark of the International Electrotechnical Commissi
5、on Warning! Make sure that you obtained this publication from an authorized distributor. colourinsideBS IEC 62906-1-2:2015 2 IEC 62906-1-2:2015 IEC 2015 CONTENTS FOREWORD . 3 1 Scope 5 2 Terms, definitions, and abbreviations 5 2.1 Classification of terms . 5 2.2 Fundamental terms . 5 2.3 Terms relat
6、ed to speckle . 5 2.4 Terms related to display category . 7 2.5 Terms related to optical devices 7 2.6 Terms related to light sources . 8 3 Letter symbols (quantity symbols / unit symbols) . 8 Annex A (informative) Categorization of speckle and speckle contrast ratio . 9 A.1 Objective speckle 9 A.2
7、Subjective speckle 9 A.3 Speckle contrast ratio . 10 Bibliography 12 Figure A.1 Optical configuration to observe objective speckle 9 Figure A.2 Optical configuration to observe subjective speckle 10 Figure A.3 Classification map of speckle 10 Table 1 Letter symbols . 8 BS IEC 62906-1-2:2015IEC 62906
8、-1-2:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LASER DISPLAY DEVICES Part 1-2: Vocabulary and letter symbols FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC Nati
9、onal 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, Technical Specifications, Technical Reports, Publi
10、cly 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 work. International, governmental and non-governm
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15、 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 independent certification bodies. 6) All users should e
16、nsure 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 personal injury, property damage or other damage o
17、f 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 Normative references cited in this publication. Use of the
18、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 responsible for identifying any or all such patent rights. I
19、nternational Standard 62601-1-2 has been prepared by IEC technical committee 110: Electronic display devices. The text of this standard is based on the following documents: FDIS Report on voting 110/661/FDIS 110/672/RVD Full information on the voting for the approval of this standard can be found in
20、 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 62906 series, published under the general title Laser display devices, can be found on the IEC website. BS IEC 62906-1-2:2015 4 IEC
21、62906-1-2:2015 IEC 2015 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 the specific publication. At this date, the publication will be reconfirmed, withdr
22、awn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its cont
23、ents. Users should therefore print this document using a colour printer. BS IEC 62906-1-2:2015IEC 62906-1-2:2015 IEC 2015 5 LASER DISPLAY DEVICES Part 1-2: Vocabulary and letter symbols 1 Scope This part of IEC 62906 gives the preferred terms, their definitions and symbols for laser display devices
24、and relevant components with the object of using the same terminology when publications are prepared in different countries. 2 Terms, definitions, and abbreviations For the purposes of this document, the following terms and definitions apply. 2.1 Classification of terms Terms for laser display devic
25、es and relevant components are classified as follows: a) fundamental terms; b) terms related to speckle; c) terms related to display category; d) terms related to optical devices; e) terms related to light sources. 2.2 Fundamental terms 2.2.1 laser display device LDD display device using a laser or
26、lasers, based on stimulated emission 2.2.2 hybrid laser display device hybrid LDD h-LDD display device using both a laser or lasers and spontaneous emission-based light sources 2.3 Terms related to speckle 2.3.1 speckle irregularly aligned spatially-modulated image created by coherent or partially c
27、oherent lights as a result of interference on a sensor plane of the visual sensory system of the observer Note 1 to entry: For a human observer, the sensor plane of the visual sensory system is the retina of the eye. 2.3.2 monochromatic speckle speckle when the light source is monochromatic or quasi
28、-monochromatic 2.3.3 colour speckle speckle when the light source is multi-coloured BS IEC 62906-1-2:2015 6 IEC 62906-1-2:2015 IEC 2015 2.3.4 speckle pattern illuminance distribution of speckle 2.3.5 speckle contrast ratio speckle contrast SCR Csratio of the illuminance standard deviation to the ave
29、rage of the speckle pattern in the measurement field Note 1 to entry: See Clause A.3 for further information. SOURCE: J.W. GOODMAN, Speckle Phenomena in Optics: Theory and Applications (Roberts and Company Publishers, Colorado, 2006) 2.3.6 signal to noise ratio inverse of the speckle contrast ratio
30、2.3.7 objective speckle speckle observed by an optical sensory system without imaging optics Note 1 to entry: See Clause A.1 for further information. SOURCE: M. KURASHIGE et al., The evaluation of speckle contrast with variable speckle generator, J. Soc. Info. Display 19/9, 631-638 (2011) 2.3.8 subj
31、ective speckle speckle observed by a visual sensory system with imaging optics Note 1 to entry: See Clause A.2 for further information. SOURCE: M. KURASHIGE et al., The evaluation of speckle contrast with variable speckle generator, J. Soc. Info. Display 19/9, 631-638 (2011) 2.3.9 projected speckle
32、subjective speckle arising from a projected interference pattern created by coherent or partially coherent light on a screen Note 1 to entry: See Clause A.2 for further information. SOURCE: M. KURASHIGE et al., “Classification of subjective speckle for evaluation of laser display”, SID Symposium Dig
33、est 45, 419-422 (2014) 2.3.10 screen speckle subjective speckle arising from the scattering or diffusion of coherent or partially coherent light on a screen Note 1 to entry: See A.2 for further information. SOURCE: M. KURASHIGE et al., “Classification of subjective speckle for evaluation of laser di
34、splay”, SID Symposium Digest 45, 419-422 (2014) BS IEC 62906-1-2:2015IEC 62906-1-2:2015 IEC 2015 7 2.3.11 speckle grain size spacing of interference fringes generated by coherent or partial coherent beams on a sensor plane of a visual sensory system 2.3.12 minimum objective speckle grain size sobjmi
35、nimum spacing of interference fringes which is determined by the interference of two coherent beams from the opposite edges of the illuminated area to the sensor plane Note 1 to entry: See Clause A.1 for further information. 2.3.13 minimum subjective speckle grain size ssubjminimum spacing of interf
36、erence fringes which is determined by the interference of two coherent beams from the opposite edges of the effective diameter of imaging optics to the sensor plane Note 1 to entry: See Clause A.2 for further information. 2.4 Terms related to display category 2.4.1 raster-scanned projection image pr
37、ojection (on a screen or a projection plane) by raster-scanning laser beams 2.4.2 full-frame projection image projection (on a screen or a projection plane) by a 2D spatial light modulator 2.4.3 line-scanned projection image projection (on a screen or a projection plane) by a combination of a 1D spa
38、tial light modulator and a 1D optical scanner 2.4.4 front projection image projection (on a screen or a projection plane) from the same side as the observer 2.4.5 rear projection image projection (on a screen or a projection plane) from the side opposite to that of the observer 2.4.6 retina direct p
39、rojection image projection directly on the retina 2.5 Terms related to optical devices 2.5.1 screen projection screen projection plane plane on which an image is projected and observed as diffused light BS IEC 62906-1-2:2015 8 IEC 62906-1-2:2015 IEC 2015 2.5.2 liquid crystal on silicon LCOS spatial
40、light modulator to create images, based on liquid crystal fabricated on a silicon wafer 2.5.3 digital mirror device digital micromirror device DMD spatial light modulator to create images by switching a Micro Electro Mechanical Systems (MEMS) mirror array 2.6 Terms related to light sources 2.6.1 sec
41、ond harmonic generation laser SHG laser coherent or partially coherent light source of which photon energy is up-converted to twice that of the pump laser through the second harmonic generation process 3 Letter symbols (quantity symbols / unit symbols) See Table 1. Table 1 Letter symbols CsSpeckle c
42、ontrast ratio sobjMinimum objective speckle grain size (m) ssubjMinimum subjective speckle grain size (m) BS IEC 62906-1-2:2015IEC 62906-1-2:2015 IEC 2015 9 Annex A (informative) Categorization of speckle and speckle contrast ratio A.1 Objective speckle Objective speckle is recognized as a speckle p
43、attern on a sensor plane without any imaging optics. Figure A.1 shows an optical configuration for explaining objective speckle and its sensing method. In this case, a sensor array is simply set at the sensor plane. Figure A.1 Optical configuration to observe objective speckle The structure of objec
44、tive speckle depends on the surface state of the screen, the illuminated area on the screen, and the distance between the screen and the sensor plane. Minimum objective speckle grain size sobjis defined as the minimum spacing of interference fringes generated by interference of two coherent beams fr
45、om the opposite edges of the illuminated area. Minimum objective speckle grain size, sobjis obtained by the following equation. objobjsin2 =s (A.1) where is the wavelength of the coherent beam; objis the half-angle between two coherent beams from opposite edges of the illuminated area. The size of t
46、he illuminated area and the distance between the sensor array and the screen should be carefully chosen to resolve the objective speckle structure sufficiently. A.2 Subjective speckle Subjective speckle is recognized as a speckle pattern on a sensor plane through imaging optics. An optical configura
47、tion for explaining the subjective speckle and its sensing method is shown in Figure A.2. In this case, a camera, implying an imaging system consisting of the sensor array and imaging lenses, is used as a sensing device. For simplicity, a single-lens system represents the imaging system in Figure A.
48、2. The minimum speckle structure depends on localized surface structure of the screen and the angular aperture of imaging lens. Therefore, minimum subjective speckle grain size ssubjis objIlluminated area Sensor plane Sensor array Laser beam Screen IECBS IEC 62906-1-2:2015 10 IEC 62906-1-2:2015 IEC
49、2015 defined as the minimum spacing of interference fringes which is determined by interference of two coherent beams from the opposite edges of the angular aperture. Minimum subjective speckle grain size, ssubjis obtained by the following equation. subjsubjsin2 =s (A.2) where is the wavelength of the coherent beam; subjis the half-angle between two coherent beams from opposite edges of the effective diameter of the imaging lens at image space. Unlike in the case of ob
