ECA TEP105-10-1987 Contrast Measurement of CRT′s《CRT的对比测量》.pdf

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1、-_ - +o extremes in ambient light. The variable light source should tie placed abo*+e the CRT and at 45 degree angle shining cm the CRT. The luminance i5 measured on the excited area and then in the center of the unexcited area Idark bar) at each ambient light levl. This is done by moving the dark b

2、ar inta the field of view of the sensor, The ambient light can be mes.sured by using a. lambertian reflector r)r by use of a FC meter. a EIA TEPL05-LO 87 m 3234600 00073LL 8 m Bmax Pmi n Contrast Rat i o Bmax /Bmi n I TEP105-10 Page 2 A data chart could be set up as follows: CRT excited area luminan

3、ce = Brnax CRT dark area luminance = Bmin Contrast Rat i o C = Pmax/Pmin The above data Should be taken at incr-easinq level5 of CRT fiiminance. i.e.: The Bmax at O ambient light should be increased from levels of say, 10 to SO foot lamberts in 10FL steps. Rata Fresmtation The followinq conditions must be stated with contrast data: 1) Tube sire 2) Tube operating conditions 3) Glass faceplate and panel li+ used) transmission 4) Spectrum of variable ambient liqht saurce used 5) FL of FC meter used 6) Specify any anti-qlare or anti-reflective treatments to the faceplate andlor panel. - a 8 e o