Service manual

ViewSonic Corporation Confidential - Do Not Copy Q9b-2
17
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) 200 According to HANNSTAR
Luminance with all pixels in black HSD190ME13-A02)
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
19”
Native
200 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 : BRTMax.
CONTMax.
20%
B
E
A
C
D
102
512
922