NEC LCD1550X-BK, Руководство по обслуживанию

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- 10 - Document No. VSPF-A028
5. Screen Performance
5.1 Test condition
AC voltage 120/240 VAC 60/50Hz
Video signal 1024X768 @60Hz 0.7Vp-p
Aging times more than 30min
Temperature 20 to 25 degrees, C.
Relative humidity 40
`
80
Setting
Brightness : 100%
Contrast and Display Image must be set by Auto-setup with test-
pattern on the screen ( Black-Level: 50% ).
Color : NATIVE
Ambient luminance 200
}
50 cd/m
2
Luminance meter Topcon BM5, BM-7, Prichard 1980A or same equivalent
5.2 Luminance
Luminance more than 160 cd/m2 : L3(Center point of TFT panel)
Uniformity more than 65%:(L min / L max ) *100
Contrast More than 160
(note 4) Judge point for brightness uniformity
Brightness uniformity is judged at nine (9) points on display area:
The brightness uniformity (Buni) is defined as the following equation.
@ @ @
Buni = (
b
Bmax or Bmin
|
Bave
b ~
100 )
^
Bave
@ @
Bmax = Maximum brightness among nine (9) measuring points
Bmin = Minimum brightness among nine (9) measuring points
Bave =Average brightness of (1) to (9)
10%
50%
90%
90%
10%
50%
(5)
(1) (2) (3)
(6)
(9) (8) (7)
(4)