Philips LP2PB201CS - Manual (Page 29)

The 21” Cyberscreen ® monitor state of the art technology
Your Cyberscreen ® monitor has put a milestone in CRT color display technology.
Thanks to its unique DDA system (Digital Dynamic Adjustment), the drives of the
RGB guns are digitally controlled over the entire screen so that the monitor electro­
nics can compensate for the lack of color and brightness uniformity of the picture
tube.
This system divides the screen into a 16x16 matrix (@ 1024*768) and for each of
the resulting 256 areas the RGB drive circuits of the electron guns can be indivi­
dually tuned, resulting in an outstanding uniform and precise image.
With the Brilliance 201CS, the whole screen area can be really used as a ‘work­
space’for creating professional color works, with an unconditional uniformity in color
and brightness from the center to the boundaries of the screen.
Expressing colors: CIE system
As previously described, by blending the three frequencies of light the eye is sensi­
tive to, it is possible to represent any of the rainbow colors.
What happens is that these three signals are sent undecoded to the brain, where
they are mixed and interpreted. In other words. Humans perceive color rather than
‘see’ it.
For that reason, color expressions often means different colors to different people,
and so it is very hard to relate a color to another person and having the other per­
son interpret it in the same way we perceive it.
The problem of expressing colors more precisely than with words was first faced in
1931 by the ‘Commission Internationale de L’Eclarage’, that designed the so called
Tristimulus Chart, more simply known as the CIE 1931 Chart.
By means of this chart, the Chromaticity of a color can be broken down in two coor­
dinates called
X and y, while the Luminance of the color is represented by Y.
In other words, x and y coordinates tell us ‘what color it is’, while the figure Y gives
us the ‘brightness’ of that color.
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Appendix A