IEC 61947-2 pdf download – Electronic projection – Measurement and documentation of key performance criteria – Part 2: Variable resolution projectors

IEC 61947-2 pdf download – Electronic projection – Measurement and documentation of key performance criteria – Part 2: Variable resolution projectors

IEC 61947-2 pdf download – Electronic projection – Measurement and documentation of key performance criteria – Part 2: Variable resolution projectors
This part of EC 61947 specifies requirements for measuring and documenting keyperformance parameters for CRT and laser-based projectors and other variable resolutionprojectors 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 ofvariable resolution projectors and are not intended to provide design goals for manufacturers ofsuch equipment.
This standard is intended for variable resolution projectors (including projection displays thatare capable of multiple variable resolutions) that are designed for use with primarily discretecolour’(RGB) raster-scanned video,text, and graphics signals generated by computerequipment.
NOTEThese devices may also accept composite or component television video signals encoded toNTSC/RS170A,PAL,SECAM,,or future HDTV,or ATV standards,which are fully described in their respectivedocumentation and are not within the scope of this part of lEC 61947. ln this part of lEC 61947, all of these signalsare referred to as television video (Tv video)(see IEC 60107-1[27])-
Displays with fixed resolutions (i.e. individual pixel light sources or matrix displays such asliquid crystal,DMD,plasma,or electroluminescent panels),are not fully addressed by thisstandard, and reference should be made to IEC 61947-1.
Factors outside the scope of this standard that may have a bearing on projector performanceare listed in annex E.A discussion of considerations informing the development of standardappears in annex c.
2Normative references
The following normative documents contain provisions which,through reference in this text,constitute provisions of this part of lEC 61947.For dated references,subsequent amendmentsto,or revisions of,any of these publications do not apply.However,parties to agreementsbased on this part of IEC 61947 are encouraged to investigate the possibility of applying themost recent editions of the normative documents indicated below. For undated references, thelatest edition of the normative document referred to applies.Members of lEC and lS0 maintainregisters of currently valid International Standards.
IEC 60050(845):1987,International Electrotechnical Vocabulary (IEV) – Chapter 845: LightingIEC 61947-1,Electronic projection – Measurement and documentation of key performancecriteria -Part 1: Fixed resolution projectorsT)
ISO 3741;1999,Acoustics – Determination of sound power levels of noise sources using soundpressure – Precision methods for reverberation rooms
ISo 7779:1999,Acoustics – Measurement of airborne noise emitted by information technologyand telecommunications equipment
For the purposes of this part of IEC61947, the following definitions apply.
active matrix display
display that uses switches at each pixel to select those pixels to which a voltage will be applied
active viewing area
horizontal and vertical dimensions in millimetres (inches) of the boundary of the array of may also be expressed in square millimetres or square inches
aperture ratio (fill factor)
light transmitting(reflecting area of a pixel times the number of pixels divided by the activeviewing area (light transmitting area and light blocking area)
aspect ratio
proportions of a projected picture area, for example,the width compared to the height. lt isusually expressed instandard ratios such as 4:3,16:9, or others
process of the beam turning off (blanking) which occurs during horizontal and vertical retraceiflybacky
Commission lnternationale de l’Eclairage (International Commission on ‘llumination)
NOTE The CIE is an organization devoted to intemational cooperation and exchange of information among itsmember countries on all imiatters relating to the art and science of lighting.
cIE chromaticity values
Cartesian coordinates used to define a colour in ClE colour space
NOTEThe 1931 chromaticity values are designated x and y. ln 1976, the ClE defined a more uniform colourspace. The 1976 cIE chromaticity walues are u and v.
colour mapping
means for accurately displaying colour signals or altering sets of colour signals in a controlledmanner
contrast ratio
luminance or illuminance ratio of a light area of the image to the dark area of the same image