Acer P7280 Refresh Service Manual page 104

2. Brightness
Procedure
Criteria
3. Full On/Full Off Contrast
Procedure
Criteria
4. Uniformity
Procedure
Criteria
- Full white pattern
- Use CL100 to measure brightness values of
P1~P9.
- Follow the brightness formula to calculate
brightness values.
☼ Brightness Formula
Avg.(P1~ P9)x1.1m
- P7270I/P7270I Refresh: 1600 lumens
P7280/P7280 Refresh: 1900 lumens
- Full white pattern & full black pattern
- Use CL100 to measure brightness values of full
white pattern P5 & full black pattern B5 ( see im-
age: full white)
- Follow Contrast formula to calculate contrast
values.
☼ Contrast Formula
P5/B5
note: P5=center of white image
B5=center of black image.
- 1500:1
- 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
ANSI Uniformity = Avg. (P1, P3, P7, P9)
- 60%
P7280/P7270I/P7280 Refresh/P7270I Refresh Confidential
2
P5
Full white pattern
Full black pattern
x 100%
4-10