Method of manufacturing a filtering layer of silicon dioxide on a display screen

A method of manufacturing a filtering layer of silicon on a display screen of a display device, characterized in that the filtering layer is manufactured by providing, on the display screen, a coating of a mixture of an alcoholic solution of an alkoxysilane compound, an alkoxy compound of at least one metal selected from the group consisting of Ge, Zr, Al and Ti, acidified water and a black dye and then heating said thus coated display screen to a temperature sufficient to form silicon dioxide from the alkoxysilane compound and to form an oxide of said metal from said alkoxy compound, thereby forming the filtering layer comprising silicon dioxide, an oxide of the metal and the dye.