The invention relates to the technical field of displaying, in particular to an optical filter, a display device where the optical filter is adopted and a method for manufacturing the optical filter. The optical filter comprises multiple pixel regions corresponding to light of multiple wave bands respectively and comprises multiple dielectric films arranged in parallel, wherein each kind of dielectric films reflect light of one wave band and transmit light of the other wave bands; in each pixel region, the dielectric film reflecting the light, corresponding to the dielectric film, of a wave band is replaced by a polarized separating film which reflects light in a first polarization direction and transmits light in a second polarization direction. According to the optical filter, transmittance of incident light and the use ratio of the incident light are improved, and thus powerful technical support can be provided for strengthening image display quality.