Appendix A: Measurement method and Formula
Equipment : Chroma 7600 Video Pattern Generator values
Set projection diagram to wide size, 25 ” inches diagonal image
1. Bightness measurement
Measure the incident light at th e ANSI nine points of the screen with the illuminometer
placed in the plane of the focused image on normal white condition. Calculation is according
to ANSI standard (for 60” diagonal projection area case)
Test Pattern: Full White Test Pattern
Formula : Average( L1+L2+…+L9) (Projection Area)
= (L1+L2+…+L9)/9 0.508m x 0.381m
L1, L2, …., L9 : the lx reading of ANSI 9 points
ANSI Test point definition
2. Light uniformity measurement(JBMA)
Test Pattern: Full White Test Pattern
Formula :
JBMA uniformity = Average (L1,L3,L7,L9 )/L5
L1,L2,…,L9 : the lx reading of 9 ANSI points
3. Light Uniformity(Dark Corner)
Test Pattern: Full White Test Pattern
Formula:
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