1、BRITISH STANDARD BS EN 61947-1:2002 Electronic projection Measurement and documentation of key performance criteria Part 1: Fixed resolution projectors The European Standard EN 61947-1:2002 has the status of a British Standard ICS 37.020; 35.180; 33.160.60 BS EN 61947-1:2002 This British Standard wa
2、s published under the authority of the Standards Policy and Strategy Committee on 17 January 2003 BSI 17 January 2003 ISBN 0 580 41123 0 National foreword This British Standard is the official English language version of EN 61947-1:2002. It is identical with IEC 61947-1:2002. The UK participation in
3、 its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international
4、 or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to i
5、nclude all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any en
6、quiries 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. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 35 and a bac
7、k cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 61947-1 NORME EUROPENNE EUROPISCHE NORM November 2002 CENELEC European Committee for Electrotechnical Standardization
8、 Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61947-1:2002 E ICS 3
9、7.020; 35.180; 33.160.60 English version Electronic projection - Measurement and documentation of key performance criteria Part 1: Fixed resolution projectors (IEC 61947-1:2002) Projection lectronique - Mesure et documentation des critres principaux de performance Partie 1: Projecteurs rsolution fix
10、e (CEI 61947-1:2002) Elektronische Projektion - Messung und Dokumentation wichtiger Leistungsmerkmale Teil 1: Projektoren fester Auflsung (IEC 61947-1:2002) This European Standard was approved by CENELEC on 2002-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations whi
11、ch 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 Central Secretariat or to any CENELEC member. This European
12、 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 status as the official versions. CENELEC members are the
13、national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 100/501/FDIS,
14、 future edition 1 of IEC 61947-1, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61947-1 on 2002-10-01. The following dates were fixed: latest date by which the EN has to be implemented at na
15、tional level by publication of an identical national standard or by endorsement (dop) 2003-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005-10-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informat
16、ive“ are given for information only. In this standard, annexes A, B, D and ZA are normative and annexes C, E, F, G, H and I are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61947-1:2002 was approved by CENELEC as a European Standard
17、 without any modification. _ 2egaP 2002:174916NESBPage2 EN619471:2002CONTENTS INTRODUCTION.4 1 Scope.5 2 Normative references5 3 Definitions 6 4 General requirements .10 5 Light output measurement and specification11 5.1 Light output specifications12 5.2 Light output uniformity .13 5.3 Contrast rati
18、o.13 5.4 Light transmission for fixed resolution projection systems: liquid-crystal imaging devices (LCD) used with an overhead projector (OHP) 13 5.5 Small area contrast ratio for alternating black and white pixel lines.14 6 Fixed resolution projectors characteristics.15 6.1 Displayable format (IEC
19、 resolution)15 6.2 Aspect ratio .15 6.3 Viewing angle (half/gain) specification for devices with an integral screen 15 6.4 Input signal format compatibility.16 6.5 Response time 16 6.6 Colour measurements16 6.7 Number of colours .17 6.8 Keystone correction.17 7 Range of focus and image size .17 8 Au
20、dio characteristics.18 9 Light source specification18 10 Maximum acoustical noise level 18 11 Power consumption 18 12 Weight18 13 Dimensions.19 14 Sync hierarchy Recommended practice19 Annex A (normative) Figures 20 Annex B (normative) Pattern generator specifications.23 Annex C (informative) Consid
21、erations in formulating this standard24 Annex D (normative) Complete sample specification.26 Annex E (informative) Conversion equations.27 Annex F (informative) Possible causes of photometric measurement errors 28 Annex G (informative) Photometer precision and veiling glare.29 Annex H (informative)
22、Light measuring devices 31 Annex I (Informative) Figure of merit for projection display colour gamut.32 Annex ZA (normative) Normative references to international publications with their corresponding European publications 34 Bibliography35 3egaP 2002:174916NESBPage3 EN619471:2002INTRODUCTION This s
23、tandard was developed to ensure a common, meaningful description of key performance parameters for fixed resolution projectors. The measurement methods and test signals correlate closely to typical uses involving computer-generated text and graphics displays. These measurements evaluate the actual v
24、iewable image that emanates from fixed 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 performance is no longer useful is hig
25、hly 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 fixed resolution projectors and is not intended to provide design goals for manufacturers of such equipment. 4egaP 2002:174916NESB
26、Page4 EN619471:2002ELECTRONIC PROJECTION MEASUREMENT AND DOCUMENTATION OF KEY PERFORMANCE CRITERIA Part 1: Fixed resolution projectors 1 Scope This part of IEC 61947 specifies requirements for measuring and documenting key performance parameters for electronic projection systems with fixed resolutio
27、n projectors in which the light source and projection/magnification optics are an integral part of the system (i.e. individual pixel light sources or matrix displays such as liquid crystal, DMD, plasma, or electroluminescent panels). It also applies to LCD panels or other fixed resolution imaging de
28、vices themselves that are used with overhead projectors. The provisions of this standard are designed to codify the measurement of the performance of variable resolution projectors and are not intended to provide design goals for manufacturers of such equipment. This standard is intended for fixed r
29、esolution projectors that are primarily designed for use with discrete colour (RGB) raster-scanned video, text, and graphics signals generated by computer equipment. NOTE These devices may also accept composite or component television video signals encoded in ITU/R publications, which are not within
30、 the scope of this standard. In this standard, all of these signals are referred to as television video (TV video). Projectors and projection systems with multiple variable resolutions, such as cathode-ray tubes and laser projectors, are not fully addressed by this standard, and reference should be
31、made to IEC 61947-2. A discussion of considerations taken into account in the development of this standard appears in Annex C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For u
32、ndated references, the latest edition of the referenced document (including any amendments) applies. IEC 61947-2, Electronic projection Measurement and documentation of key performance criteria Part 2: Variable resolution projectors IEC 61966-4, Multimedia systems and equipment Colour measurement an
33、d management Part 4: Equipment using liquid crystal display panels IEC 61966-5, Multimedia systems and equipment Colour measurement and management Part 5: Equipment using plasma display panels ISO 3741, Acoustics Determination of sound power levels of noise sources using sound pressure Precision met
34、hods for reverberation rooms ISO 7779, Acoustics Measurement of airborne noise emitted by information technology and telecommunication equipment 5egaP 2002:174916NESBPage5 EN619471:20023 Definitions For the purposes of this standard, the following definitions apply. 3.1 active matrix display display
35、 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 the array of pixels. It may also be expressed in square millimetres or square inches 3.3 aperture ratio (f
36、ill 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 proportions of a projected picture area, for example, the width compared to the height NOTE It is usually express
37、ed 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 Internationale de lEclairage, the international commission on illumination NOTE The CIE is an organization devo
38、ted 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 to define a colour in CIE colour space NOTE The 1931 chromaticity values are designated x and y.
39、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 in a controlled manner 3.9 contrast ratio luminance or illuminance ratio of a light area of the im
40、age to the dark area of the same image 3.10 correlated colour temperature (CCT) of the white-point temperature, in kelvins, of the black-body radiator the chromaticity 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
41、) uniform chromaticity space NOTE An algorithm for computing CCT of the white-point, either from 1931 CIE (x, y) coordinates or from 1960 (u,v) coordinates, appears in Wyszecki and Stiles 1. A graphical nomogram also appears in this work. 6egaP 2002:174916NESBPage6 EN619471:2002Alternatively, a succ
42、essful numerical approximation has been derived by C. S. McCamy 2. Given CIE 1931 coordinates (x, y), McCamys approximation is CCT = 437 n 3+ 3601 n 2+ 6831 n + 5517 where n = (x - 0,3320)/(0,1858 - y). This approximation, the second of three proposed, is close enough for any practical use between 2
43、000 K and 10 000 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 0,01 from the Planckian locus (see Robinson et al 3), where the distance is specified by: 2 ) - ( + 2 ) - ( = 2 1 2 1 v v u u uv Most commercial c
44、olorimeters will report 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 micromirror array. The DMD can switch incident light on or off in discrete pixels within microseconds to prod
45、uce 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, s
46、tereoscopic, tangential, and wide-angle. 3.13 f/number stop number the reciprocal value of the relative aperture NOTE Relative aperture of a photographic lens: twice the numerical aperture where the numerical aperture is the sine of the semi-angle subtended by the exit pupil at the focal plane. For
47、photographic applications, the aperture is equivalent (within a 1/3 stop) to the ratio of the diameter of the entrance pupil to the focal length. (See ISO 517: 1996(E) Photography Apertures and related properties pertaining to photographic lenses Designations and measurements.) 3.14 fall time time,
48、in milliseconds, for the image brightness to change from 90 % of its maximum value to 10 % of its maximum value 3.15 focal length distance between the centre of the focusing lens or mirror and the focal spot. NOTE Shorter focal length projection lenses produce larger screen images for a given distan
49、ce from the screen 3.16 focus adjustment of an optical system to achieve the greatest possible sharpness 3.17 four corners centres of the four corner points (see Figure A.2), located at 10 % of the distance from the corners to the centre of point 5 3.18 front screen projection image projected on the audience side of a light-reflecting screen 7egaP 2002:174916NESBPage7 EN619471:20023.19 illuminance q
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