carried out by photolithography by the use of this filter solution as to the inorganic pigment for example cobalt blue coo al 2 o 3 or ultramarine blue is used as b and cobalt green tio 2 coo nio zrp 2 or cobalt green coo cr 2 o 3 tio 2 al 2 o 3 is used as g and iron oxide fe 2 o 3 cadmium red cds cdse chrome vermilion pbcro 4 pbmoo 4 pbso 4 or the like is used as r on the other hand a filter solution of the be filter 25 is prepared as follows organic pigment is mixed with dispersant i e and alcohol and agitated by a dispersing device so as to gain ultrafine particles and then this is mixed with sol gel solution of sio 2 zro 2 as a result the filter solution is gained next a filter solution is coated on an outer surface of the glass panel 9 of the cathode ray tube by spinning process this solution is hardened at a temperature of about 170 u00b0 c at which the organic pigment is capable of withstanding so as to form the be filter 25 the m filters 19 21 and 23 correspond to respective colors of g b and r selectively and absorb a wave length region other than a light emitting portion of the fluorescent substance so as to effectively absorb.