1、BRITISH STANDARD Electronic projection - Measurement and documentation of key n o o performance criteria Part 2: Variable resolution projectors The European Standard EN 61947-2:2002 has the status of a British Standard ICs 33.160.60; 35.140; 37.020 BS EN 6 1 947-212002 Wk present to the responsible
2、international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request
3、 to its secretary. Cr oss-r e fer enc e s The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility o
4、f the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
5、 Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 45 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 16 April 2002 ISBN O 580 39439 5 EUROPEAN STANDARD EN 61947-2 NORME
6、EUROPENNE EUROPISCHE NORM Februarv 2002 ICs 33.160.60;35.140;37.020 English version Electronic projection - Measurement and documentation of key performance criteria Part 2: Variable resolution projectors (IEC 61 947-212001) Projection lectronique - Mesure et documentation des critres principaux de
7、performance Partie 2: Projecteurs rsolution variable (CE1 61947-212001) Elektronische Projektion - Messung und Dokumentation wichtiger Leistungsmerkmale Teil 2: Projektoren variabler Auflsung (IEC 61947-212001) This European Standard was approved by CENELEC on 2001-1 1-01, CENELEC members are bound
8、to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Centr
9、al Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same sta
10、tus as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC
11、 European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels O 2002 CENELEC - All rights of exploitation in any form and by any means reserved world
12、wide for CENELEC members. Ref. No. EN 61947-2:2002 E Page 2 EN 61947-22002 Foreword The text of document 100/268/FDIS, future edition 1 of IEC 61947-2, prepared by SC IOOC, Audio, video and multimedia subsystems and equipment, of IEC TC 100, Audio, video and multimedia systems and equipment, was sub
13、mitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61947-2 on 2001-1 1-01, The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement - latest date by which the nation
14、al standards conflicting with the EN have to be withdrawn (dop) 2002-08-01 (dow) 2004-1 1-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes A, B, D, G and ZA are normative and annexes C,
15、E, F, H, I and J are informative. Annex ZA has been added by CENELEC. Endorsement not i ce The text of the International Standard IEC 61947:2001 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added fo
16、r the standards indicated : IS0 9241-8 NOTE Harmonized as EN IS0 9241-8:1997 (not modified), IEC 601 07-1 NOTE Harmonized as EN 60107-1:1997 (not modified), O BSI 16 April 2002 Page 3 EN 61947-22002 CONTENTS INTRODUCTION . 1 Scope . . 6 2 Normative references . 6 3 Definitions . 4 General requiremen
17、ts . 7 II 5 Light output measurement and specification 5.1 Light output specifications 5.1.2 5.1.3 5.2.1 Full-black light level specification . Luminance specification for devices with an integral screen 5.2 Light output uniformity Example of a uniformity specification 5.3 Contrast ratio . 5.4 Blank
18、ing measurement and specification 5.5 Effective blanking time . 5.6 Blanking specification 6 Variable resolution projector characteristics . 6.1.2 Horizontal resolution 6.1.3 Vertical resolution 6.1.4 Procedure 6.2 Video frequency response specifications 6.4 Input signal format compatibility . 6.5 R
19、esponse time . 6.6 Colour measurements 6.6.1 Colour chromaticity 6.6.2 Colour uniformity 6.7 Keystone correction . 7 Range of focus and image size 8 Audio characteristics . 9 Light source specification 21 10 Noise: maximum sound level . . .22 11 Power consumption . 12 Weight 13 Dimensions . 14 Recom
20、mended practices . . .22 . .22 14.1 Recommended practice 1 - Sync hierarchy 14.2 Recommended practice 2 - DC restoration . . .22 14.3 Recommended practice 3 - Sync . 23 O BSI 16 April 2002 Page 4 EN 61947-22002 Annex A (normative) Figures 24 Annex B (normative) Pattern generator specifications . 28
21、Annex C (informative) Considerations in formulating this standard 29 C.l General . 29 C.2 Light output measurement . 29 C.3 Visual resolution measurement 30 C.4 Possible causes for measurement errors 30 C.5 Input signal levels 30 Annex D (normative) Complete sample specification . 32 Annex E (inform
22、ative) Other issues, outside the scope of this standard. that may affect picture clarity . 34 Annex F (informative) Possible causes of photometric measurement errors 35 F.l Size of measured spot . 35 F.2 Colour measurement . 35 Annex G (normative) Alternative method for measuring resolution using th
23、e NIDL grille contrast method 36 Annex H (informative) Photometer precision and veiling glare . 38 H.l Photometer precision 38 H.2 Integration time 38 H.3 Veiling glare 38 Annex I (informative) Light measuring devices 40 Annex J (informative) Figure of merit for projection display colour gamut 41 An
24、nex ZA (normative) Normative references to international publications with their corresponding European publications 45 Bibliography 43 Figure A.l . Test patterns/measurements set-up . 24 Figure A.2 . Thirteen-point measuring grid 25 Figure A.3 . Contrast measurement 25 Figure A.4 . Vertical alterna
25、ting lines . 25 Figure A.5 . Horizontal alternating lines 26 Figure A.6 . Resolution equipment set-up/depth of modulation measurement 26 Figure A.7 . Sync and blanking timing . 27 Figure C.l . Simulation of lowered resolution 31 O 16 April 2002 Page 5 EN 61947-22002 INTRODUCTION This standard was de
26、veloped to ensure a common, meaningful description of key performance parameters for variable resolution projectors (for example, CRT or laser projectors). The measurement methods and test signals correlate closely to typical uses involving computer-generated text and graphics displays. These measur
27、ements evaluate the actual viewable image that emanates from variable resolution projectors. The resulting performance specifications are conservative in nature and allow any display device to be used beyond its rated specifications with degraded performance. The point at which this degraded perform
28、ance is no longer useful is highly subjective and strongly affected by the environment and the application. This standard is designed to specify a means of measuring and quantifying the performance of variable resolution projectors and is not intended to provide design goals for manufacturers of suc
29、h equipment. O BSI 16 April 2002 Page 6 EN 61947-22002 ELECTRONIC PROJECTION - MEASUREMENT AND DOCUMENTATION OF KEY PERFORMANCE CRITERIA - Part 2: Variable resolution projectors 1 Scope This part of IEC 61947 specifies requirements for measuring and documenting key performance parameters for CRT and
30、 laser-based projectors and other variable resolution projectors that are capable of multiple variable resolutions and in which the image is raster- scanned. The provisions of this standard are designed to codify the measurement of the performance of variable resolution projectors and are not intend
31、ed to provide design goals for manufacturers of such equipment. This standard is intended for variable resolution projectors (including projection displays that are capable of multiple variable resolutions) that are designed for use with primarily discrete colour (RGB) raster-scanned video, text, an
32、d graphics signals generated by computer equipment. NOTE These devices may also accept composite or component television video signals encoded to NTSC/RS170A, PAL, SECAM, or future HDTV, or ATV standards, which are fully described in their respective documentation and are not within the scope of thi
33、s part of IEC 61947. In this part of IEC 61947, all of these signals are referred to as television video (TV video) (see IEC 60107-1 27). Displays with fixed resolutions (.e. individual pixel light sources or matrix displays such as liquid crystal, DMD, plasma, or electroluminescent panels), are not
34、 fully addressed by this standard, and reference should be made to IEC 61947-1. Factors outside the scope of this standard that may have a bearing on projector performance are listed in annex E. A discussion of considerations informing the development of standard appears in annex C. 2 Normative refe
35、rences The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61947. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this pa
36、rt of IEC 61947 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and IS0 maintain registers of currently valid Intern
37、ational Standards. IEC 60050(845): 1987, Infernafional Elecfrofechnical Vocabulary (IEV) - Chapfer 845: Lighfing IEC 61 947-1, Elecfronic projecfion - Measuremenf and documenfafion of key performance criteria - Parf 1: Fixed resolufion projecforsl! 1) To be published. O BSI 16 April 2002 Page 7 EN 6
38、1947-22002 IS0 3741 :I 999, Acousfics - Deferminafion of sound power levels of noise sources using sound pressure - Precision mefhods for reverberafion rooms IS0 7779:1999, Acousfics - Measuremenf of airborne noise emiffed by informafion fechnology and felecommunicafions equipmenf 3 Definitions For
39、the purposes of this part of IEC 61947, the following definitions apply. 3.1 active matrix display display that uses switches at each pixel to select those pixels to which a voltage will be applied 3.2 active viewing area horizontal and vertical dimensions in millimetres (inches) of the boundary of
40、the array of pixels. It may also be expressed in square millimetres or square inches 3.3 aperture ratio (fill factor) light transmitting/reflecting area of a pixel times the number of pixels divided by the active viewing area (light transmitting area and light blocking area) 3.4 aspect ratio proport
41、ions of a projected picture area, for example, the width compared to the height. It is usually expressed in standard ratios such as 4:3, 16:9, or others 3.5 blanking process of the beam turning off (blanking) which occurs during horizontal and vertical retrace (flyback) 3.6 CIE Commission Internatio
42、nale de IEclairage (International Commission on Illumination) NOTE The CIE is an organization devoted to international cooperation and exchange of information among its member countries on all matters relating to the art and science of lighting. 3.7 CIE chromaticity values Cartesian coordinates used
43、 to define a colour in CIE colour space NOTE The 1931 chromaticity values are designated x and y. In 1976, the CIE defined a more uniform colour space. The 1976 CIE chromaticity values are u and v. 3.8 colour mapping means for accurately displaying colour signals or altering sets of colour signals i
44、n a controlled manner 3.9 contrast rat o luminance or illuminance ratio of a light area of the image to the dark area of the same image O BSI 16 April 2002 Page 8 EN 61947-22002 3.10 correlated colour temperature (CCT) of the white-point temperature, in kelvins, of the black-body radiator, the chrom
45、aticity of which is closest to the chromaticity of a particular light, for example from a display screen, as measured in the 1960 CIE (U, V) uniform chromaticity space NOTE An algorithm for computing the CCT of the white-point, either from 1931 CIE (x, y) coordinates or from 1960 (u, v) coordinates,
46、 appears in Wyszecki and Stiles I. A graphical nomogram also appears in this work. Alternatively, a successful numerical approximation has been derived by C. S. McCamy 2. Given CIE 1931 coordinates (x, y), McCamys approximation is CCT = 437 n3 + 3 601 n2 + 6 831 n + 5 517, where n = (x - 0,3320)/(0,
47、1858 - y). This approximation, the second of three proposed, is close enough for any practical use between 2 O00 K and 10 O00 K. In units of 1960 u ,v chromaticity, it is agreed that the concept of CCT of the white-point has little meaning beyond the distance of 0,Ol from the Planckian locus (see Ro
48、binson et al 3), where the distance is specified by Auv=J(ul -UJ +(VI -v2) 2 Most commercial colourimeters will report the CCT of the white-point from 0,0175 u, v units above the Planckian locus to 0,014 u, v units below this locus. 3.11 digital micromirror device (DMD) semiconductor light micromirr
49、or array. The DMD can switch incident light on or off in discrete pixels within microseconds to produce projection display systems 3.12 optical distortion situation in which an image is not a true-to-scale reproduction of an object due to the optics of the system NOTE There are many types of distortion, such as anamorphic, barrel, curvilinear, geometric, keystone, panoramic, perspective, radial, stereoscopic, tangential, and wide-angle. 3.13 fhumber focal length of a projection lens divided by the diameter of the lens aperture 3.14 fall time time, in mil
