ASTM_E_1336_-_11.pdf

Designation:E133611Standard Test Method forObtaining Colorimetric Data From a Visual Display Unit bySpectroradiometry1This standard is issued under the fixed designation E1336;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe fundamental procedure for characterizing the color and luminance of a visual display unit(VDU)is to obtain the spectroradiometric data under specified measurement conditions,and fromthese data to compute CIE chromaticity coordinates and absolute luminance values based on the 1931CIE Standard Observer.The considerations involved and the procedures to be used to obtain precisioncolorimetric data for this purpose are contained in this test method.The values and procedures forcomputing CIE chromaticity coordinates are contained in Practice E308.The procedures for obtainingspectroradiometric data are contained in Test Method E1341.This test method includes somemodifications to the procedures given in Practice E308 that are necessary for computing the absoluteluminance values of VDUs.This procedure is intended to be generally applicable to any VDU device,including but not limited to cathode ray tubes(CRT),liquid crystal displays(LCD),and electrolu-minescent displays(ELD).1.Scope1.1 This test method prescribes the instrumental measure-ments required for characterizing the color and brightness ofVDUs.1.2 This test method is specific in scope rather than generalas to type of instrument and object.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E284 Terminology of AppearanceE308 Practice for Computing the Colors of Objects by Usingthe CIE SystemE1341 Practice for Obtaining Spectroradiometric Data fromRadiant Sources for Colorimetry2.2 CIE Publications:Publication CIE No.18 Principles of Light Measurements3Publication CIE No.15.2 Colorimetry,2nd ed.,19863Publication CIE No.63 Spectroradiometric Measurement ofLight Sources,198432.3 IEC Publications:Publication No.441 Photometric and Colorimetric Methodsof Measurement of the Light Emitted by a Cathode-RayTube Screen,197443.Terminology3.1 The definitions of appearance terms in TerminologyE284 are applicable to this test method.4.Summary of Test Method4.1 Procedures are given for obtaining spectroradiometricdata and for the calculation of CIE tristimulus values and othercolor coordinates to describe the colors of VDUs.Modifica-tions to the standard calculation procedures of Practice E308are described.1This test method is under the jurisdiction of ASTM Committee E12 on Colorand Appearance and is the direct responsibility of Subcommittee E12.06 on ImageBased Color Measurement.Current edition approved Nov.1,2011.Published November 2011.Originallyapproved in 1991.Last previous edition approved in 2003 as E1336 96(2003).DOI:10.1520/E1336-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from U.S.National Committee of the CIE(International Commissionon Illumination),C/o Thomas M.Lemons,TLA-Lighting Consultants,Inc.,7 PondSt.,Salem,MA 01970,http:/www.cie-usnc.org.4Available from International Electrotechnical Commission(IEC),3 rue deVaremb,Case postale 131,CH-1211,Geneva 20,Switzerland,http:/www.iec.ch.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 The most fundamental method for obtaining CIE tris-timulus values or other color coordinates for describing thecolors of visual display units(VDUs)is by the use ofspectroradiometric data.(See CIE No.18 and 63.)These dataare used by summation together with numerical values repre-senting the 1931 CIE Standard Observer and normalized to Km,the maximum spectral luminous efficacy function.5.2 The special requirements for characterizing VDUs pos-sessing narrow or discontinuous spectra are presented anddiscussed.Modifications to the requirements of Practice E308are given to correct for the unusual nature of narrow ordiscontinuous sources.6.Requirements When Using Spectroradiometry6.1 When describing the measurement of VDUs byspectroradiometry,the following must be specified:6.1.1 The radiometric quantity determined,such as theirradiance(W/m2)or radiance(W/m2-sr),or the photometricquantity dete