Method of lacquering the luminophore layer of a color picture tube

Abstract

The following steps are performed in a method of lacquering the luminophore layer of a colour picture tube: the luminophore layer is first prewetted, a first aqueous dispersion of a lacquer is applied to the prewetted luminophore layer, this first dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a first lacquer film, a second aqueous dispersion is applied directly to the first lacquer film, where the said second aqueous dispersion has exactly the same components as the first dispersion and the concentration of the components in the second dispersion corresponds at least to a large extent to the concentration of these components in the first dispersion, and this second dispersion is fully dried and heated to above the film formation temperature of the lacquer, thereby producing a second lacquer film. This two-stage lacquering process makes it possible obtain screen brightnesses that are about 10% greater than can be obtained by means of conventional single-stage lacquering methods.

Dependencies are inferred from the claim text.