Service manual

ViewSonic Corporation Confidential - Do Not Copy Q7b-3
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3.7 Brightness Uniformity and Contrast Ratio
a. Brightness Uniformity:
128 640 1152
Bmax = MAX (BA, BB, BC, BD, BE)
Bmax - Bmin Bmin = MIN (BA, BB, BC, BD, BE)
Bmax Bave = AVE (BA, BB, BC, BD, BE)
b. Contrast Ratio:
The contrast ratio is measured at point A and calculated by using the following formula
Luminance with all pixels in white
Contrast ratio (CR) ＝ ≧ 400（According to CMO
Luminance with all pixels in black M170E5-L09）
3.8 Shipping Luminance
a. Condition Input signal : Full white pattern
Controls : Color temperature of Office
Cont./Brt. : Default value
Measurement point : One point at the center of the picture.
Warm-up time : 30 minutes.
Color analyzer : CA-210
c. Shipping luminance (center)
Shipping Luminance
Color Temperature
17”
Native
≧ 230 cd / ㎡
3.9 Maximum / Minimum Luminance
a. Condition Input signal : Full white pattern (Primary mode)
Measurement point : Center of LCD screen
Color Analyzer : CA-210
Maximum : BRT→Max.
CONT→Max.
b. Specification: Native only
(1) ≧230 cd/㎡
≦ 20%
B
E
A
C
D
102
512
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