Philips LP2PB201CS - Manual (Page 31)

The convergence problem
The electron guns in a color CRT are mounted alongside each other and in most
cases they are placed in line.
This is necessary for the shadow mask in fiitering out the eiectron beams on their
way to the front of the screen, so that they can reach the designated phosphor oniy.
The problem with this system is that the offset beams travei along different paths
and may fail to hit the same phosphor triad, as instructed by the computer. This is
caiied convergence error and it is usualiy perceived as a fringing around the dots
on the screen.
in severe cases, a dot or a iine designated to be as ‘white’, may be completely resol­
ved into its red, green and blue components.
The problem of convergence is usually more noticeable when the beam approaches
the screen corners, where the beams path lengths offset reach its maximum.
The Cyberscreen ® solution
The convergence problem has been solved in your Brilliance 201CS by using the
same approach as previously described about the screen uniformity.
The built in DDA system divides the screen in a 16x16 matrix and, for each of the
resulting areas, the beams position and so the convergence can be precisely opti­
mized.
As a result, all the conventional CRT errors can be cximpensated so that the
displayed image can only be as sharp and precise as you have never seen before.
24 Appendix A