Image Performance; Image Stabilizing Time; Colour Temperature And Tracking - Nokia 445PRO Service Manual

21” high resolution colour monitor
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6. Image performance

Measurement to verify this specification shall be made with equipment that measures the displayed
image as if it were projected forward onto a flat plane tangent to the center of the CRT faceplate sur-
face and perpendicular to the Z---axis of the CRT.
Image performance specifications are applicable over specified input power conditions, specified
environmental operating conditions and after being subjected to the specified non---operating en-
vironmental conditions. Before performance measurements the monitor must have been in room
temperature (20
8 C) for at least 2 hours. After that the monitor must have been warmed up with
power on at least 60 minutes.
The monitor shall be positioned to a magnetic field which is specified as 0 G horizontal field and
0.45 G vertical field (northern hemisphere) when ever the image performance is measured.
If there is no standardized magnetic field available, the monitor should be positioned face to east.
All image performance specifications will be met in diffuse ambient 500 lux.
All the performance specifications are met when using factory adjusted timing modes within line fre-
quencies 60 kHz --- 121 kHz. The timings below 60 kHz line frequency are usable, but not specified.
Performance is optimized for 1280 x 1024, 95 Hz and 1600 x 1200, 85 Hz (VESA) resolution

6.1. Image stabilizing time

The image shall begin to be visible in a 500 lux environment within 15 seconds of application of pow-
er and input signals.
The image shall be stabilized within 30 seconds of application of power and input signals. "Stabi-
lized" means that no significant changes shall occur in the image quality specifications, such as
image brightness, size, linearity and so on.
The image shall reach performance stability within 20 minutes of the application of power and input
signals. "Performance Stability" means that the display monitor shall meet all of its image quality
specifications.

6.2 Colour temperature and tracking

The default colour temperature is 9300 ˚K
Measurement conditions:
--- test pattern 50*50 mm white field at the screen centre
--- brightness control adjusted for a background raster luminance level of 1 nit
--- input signals R, G, B with maximum amplitude
When contrast ---control is adjusted for 70 nits luminance level, the factory adjusted colour coordi-
nates measured at the screen centre will be:
x = 0.283
0.015 = x ref
y = 0.297
0.015 = y ref
When contrast ---control is adjusted from a luminance level of 100 cd/m2 to 35 cd/m2 or its adjust
stop, the colour coordinates measured at the screen centre will be:
x = x ref
0.015
y = y ref
0.015
22
445N

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