Abstract: In a multicolor liquid crystal display device, when a color filter (1) is formed above or beneath an electrode (2) by the use of a printing process, the film thickness is not uniform with indentation produced, thereby constituting a cause of the non-uniformity of orientation treatment and a defect in electroconductivity of the electrode. In this invention, the color filter (1) is formed by the use of a printing process so that the printing parameter .alpha. expressed by the following equation [1] is not smaller than 20 and the overlapping between the neighboring color filters is within the range of .alpha./3.about.(.alpha.+30).mu.:.alpha.=T(.mu.)/tan.theta.

Abstract: The color filter of this invention comprises a transparent substrate, a porous activated film layer formed on the substrate and made of activated alumina or activated silica or a mixture thereof, a colored area or a pattern formed by the dye fixed in the minute pores of the activated film layer, and a coating layer sealingly closing the upper portions of the minute pores of said activated film layer. This color filter is relatively simple and easy to manufacture, superior in resistivity to heat, water, chemicals, solvents, etc. and suitable for use as a color filter in various display devices, particularly liquid crystal display devices.