Screen Performance; Test Condition; Luminance - NEC LCD1550X Service Manual

5. Screen Performance

5.1 Test condition

AC voltage
Video signal
Aging times
Temperature
Relative humidity
Setting
Ambient luminance
Luminance meter

5.2 Luminance

Luminance
Uniformity
Contrast
(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.
@ @ @
120/240 VAC 60/50Hz
1024X768 @60Hz 0.7Vp-p
more than 30min
20 to 25 degrees, C.
40 ` 80
Brightness : 100%
Contrast and Display Image must be set by Auto-setup with test-
pattern on the screen ( Black-Level: 50% ).
Color : NATIVE
200 }50 cd/m
Topcon BM5, BM-7, Prichard 1980A or same equivalent
more than 160 cd/m2 : L3(Center point of TFT panel)
more than 65%:(L min / L max ) *100
More than 160
Buni = ( bBmax 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)
(1) (2)
(4) (5)
(7) (8)
50%
10%
2
90%
(3)
50%
(6)
(9)
90%
- 10 -
10%
Document No. VSPF-A028