Optoma EX612 Service Manual page 52

3. Full On/Full Off Contrast
Procedure
Criteria
4. Uniformity
Procedure
Criteria
- Full white pattern & Full black pattern
- Use CL100 to measure brightness values of full
white pattern P5 & full black pattern B5
- Follow Contrast formula to calculate contrast
values.
☼ Contrast Formula
P5/B5
Note: P5=center of white image
B5 = the center of black image.
• 1600:1
- Full white pattern
- Use CL100 to measure brightness values of
P1~P9 (see image: Full white).
- Follow the Uniformity formula to calculate
average values.
☼ Uniformity Formula
JBMA Uniformity = Avg. (P1, P3, P7, P9)/
P5X100%
• 70%
EX612/EX615/EW615i/EX612i/EX615i
Full black pattern
Full white pattern
EX615i Confidential
4-5