445N
23
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.
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 to any directions.
Measurement conditions: same as spec. 6.3
6.5 Luminance
Definition:
The following methodology and definition of luminance shall be applicable throughout this specifica-
tion
Luminance shall be measured on 1600 x 1280@85 Hz pixel format at five areas, using two different
pictures:
--- 1. In the center of the screen white 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 30 nits (40. 9Ft---L) 50*50 mm w hite field
L0 = 110 10 nits (29.4 Ft---L) Full white field
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 ± 10 nits
The background shall be extinguished before brightness control reaches its end.
Luminance uniformity:
With the brightness control set so that the background raster is just extinguished the contrast con-
trol set for L0 = 100 nits, ( 29.2 Ft---L), luminance on areas L1, L2, L3 and L4 shall be greater than
(80 %) of L0.(80 nits, 23 Ft---L)
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