Service manual

C20
Condential
4-8
2. Brightness
Procedure - Full white pattern
- Use CL100 to measure brightness values of
P1~P9.
- Follow the brightness formula to calculate
brightness values.
☼ Brightness Formula
Avg. (P1+P2+P3+...+P9) x 0.12
Criteria • 8 ANSI Lumens
3. Full On/Full Off Contrast
Procedure - Full white pattern & full black pattern
- Use CL100 to measure brightness values of full
white pattern P5 & full black pattern B5 ( see
image: full white)
- Follow Contrast formula to calculate contrast
values.
☼ Contrast Formula
P5/B5
Note: P5=center of white image
B5 = the center of black image.
Criteria • 800:1
4. Uniformity
Procedure - 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)/P5×100%
Criteria • 65 %
Full black pattern
Full white pattern