the invention relates to a method of manufacturing a luminescent screen structure 22 with a light - absorbing matrix 23 , having a plurality of substantially equally sized openings therein , on an inner surface of a crt faceplate panel 12 . a color selection electrode 24 is spaced a distance , q , from the inner surface . the method includes providing a first photoresist layer 50 , whose solubility is altered when it is exposed to light , on the inner surface of the faceplate panel 12 . the first photoresist layer 50 is exposed to light from two symmetrically located source positions + g and - g , relative to a central source position , 0 . then the more soluble regions 54 of the photoresist layer 50 are removed , overcoated with a light - absorbing material 58 and developed to remove the retained , less soluble regions 52 of the first photoresist layer with the light - absorbing material thereon . first guardbands 60 of light - absorbing material remain on the interior surface of the faceplate panel 12 . the process is repeated twice more , using second and third photoresist layers 70 and 90 and two asymmetrically located light source positions + b , - b and + r , - r , respectively to produce second and third guardbands 80 and 100 .