446F
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6.3. White Uniformity
Measurement conditions:
--- Full screen picture size, Brightness in middle 100 nit
--- Magnetic field horizontal 0 Gauss
vertical 0.45 Gauss
--- W arming up time 1 hour
Maximum variation between colour coordinates between any measurement points shall not vary
more than d(x),d(y) below.
Colour coordinates from corner to center:
d(x) = ± 0.015
d(y) = ± 0.015
6.4. Colour Purity
There should not be visual discoloration with each of t he red, green and blue beams after the
tube is moved t o any directions.
Measurement conditions: same as spec. 8.3
6.5. Luminance
--- D e f i n it i o n :
The following methodology and definition of luminance shall be applicable throughout
this specification.
Luminance shall be measured on 1280 x 1024 85 Hz pixel format at five areas, using two differ-
ent pictures:
1. In the center of the screen wh ite field 50*50 mm.
2. Full white field.
Thefiveareasaredefinedas:
L0 Center of the screen L1 L2
L1 Upper left of the screen
L2 Upper right of the screen L0
L3 Lower left of t he screen
L4 Lower right of the screen L3 L4
--- Requirements
Maximum contrast luminance:
With the brightness control set so that background brightness is 1 nit and the contrast control
set to maximum.
L0 = 140 +/--- 20 nits (41 Ft---L) 50*50 mm white field
L0 = 1 1 0 + / --- 1 0 n it s (3 2 F t --- L) Fu l l w h i t e f i e ld
Minimum luminance
Using full w hite picture, w ith the brightness and contrast controls in minimum, the foreground
full white field (L0) < 5 nits.
Background luminance:
The luminance of the background, measured at center of the screen without active video and in
the absence of significant ambient illumination, brightness at maximum must be:
1nit.=<L0=<7nits
The background shall be extinguished before brightness control reaches its end.
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