IEC 61947-2 pdf download

IEC 61947-2 pdf download Electronic projection – Measurement and documentation of key performance criteria – Part 2: Variable resolution projectors
1 Scope
This part of lEC 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.
NOTE These 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. In this part of IEC 61947, all of these signalsare referred to as television video (Tv video) (see lEC 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 lEC 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.
Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of IEC 61947.For dated references,subsequent amendmentsto,or revisions of，any of these publications do not apply. However，parties to agreementsbased on this part of Ec 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 lSO 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 projectors)
3 Definitions
For the purposes of this part of IEC 61 947, 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 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
proportions of a projected picture area, for example, the width compared to the height. It is usually expressed in standard ratios such as 4:3, 1 6:9, or others