A displaying system, comprising: an imaging window including a transparent substrate and a transflective film attached to a first surface of the transparent substrate; and an image source that emits s-polarized light incident on the imaging window through the transflective film, characterized by that, light emitted by the image source before reaching the transflective film only includes the s-polarized light, wherein the s-polarized light emitted by the image source before reaching the transflective film has N spectral lines or bands in the visible light band, wherein N is a positive integer not less than 1; wherein the N spectral lines or bands each have a FWHM (full-width at half-maximum) equal to or less than 60 nm, and for each of the N spectral lines or bands in the visible spectra of the s-polarized light emitted from the image source, a major band is defined as the spectra band centered at the peak of the line or the band and expanding up to the FWHM so that the N spectral lines or bands include N maj or bands; the transflective film being capable of reflecting the s-polarized light emitted by the image source at a first angle with respect to the normal line, and meanwhile capable of transmitting ambient light at a second angle with respect to the normal line, wherein the first angle has a first angle range from 30 to 89 degrees, and the second angle has a second angle range from 30 degrees to 80 degrees; at said first angle, the transflective film has a first average reflectivity for the s-polarized light emitted by the image source in at least one major band of the N major bands, and has a second average reflectivity for the s-polarized light emitted by the image source in visible bands outside the at least one major band, wherein the first average reflectivity is different from the second average reflectivity, at said first angle, an average reflectivity of the transflective film for the s-polarized light emitted by the image source in each of the N major bands is greater than 50%; at said first angle, an average s-polarized reflectivity of the transflective film for visible bands outside the N major bands is at least 5% lower than that for the at least one major band; at the second angle, the transflective film has an average transmissivity greater than 60% for p-polarized light in both of the at least one major band and the visible bands outside the at least one major band, wherein the transflective film is formed by stacking at least two types of film layers having different refractive indexes, the composition of the film layer being selected from one or more of tantalum pentoxide, titanium oxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride, and aluminum fluoride. an imaging window including a transparent substrate and a transflective film attached to a first surface of the transparent substrate; and an image source that emits s-polarized light incident on the imaging window through the transflective film, characterized by that, light emitted by the image source before reaching the transflective film only includes the s-polarized light, wherein the s-polarized light emitted by the image source before reaching the transflective film has N spectral lines or bands in the visible light band, wherein N is a positive integer not less than 1; wherein the N spectral lines or bands each have a FWHM (full-width at half-maximum) equal to or less than 60 nm, and for each of the N spectral lines or bands in the visible spectra of the s-polarized light emitted from the image source, a major band is defined as the spectra band centered at the peak of the line or the band and expanding up to the FWHM so that the N spectral lines or bands include N maj or bands; the transflective film being capable of reflecting the s-polarized light emitted by the image source at a first angle with respect to the normal line, and meanwhile capable of transmitting ambient light at a second angle with respect to the normal line, wherein the first angle has a first angle range from 30 to 89 degrees, and the second angle has a second angle range from 30 degrees to 80 degrees; at said first angle, the transflective film has a first average reflectivity for the s-polarized light emitted by the image source in at least one major band of the N major bands, and has a second average reflectivity for the s-polarized light emitted by the image source in visible bands outside the at least one major band, wherein the first average reflectivity is different from the second average reflectivity, at said first angle, an average reflectivity of the transflective film for the s-polarized light emitted by the image source in each of the N major bands is greater than 50%; at said first angle, an average s-polarized reflectivity of the transflective film for visible bands outside the N major bands is at least 5% lower than that for the at least one major band; at the second angle, the transflective film has an average transmissivity greater than 60% for p-polarized light in both of the at least one major band and the visible bands outside the at least one major band, wherein the transflective film is formed by stacking at least two types of film layers having different refractive indexes, the composition of the film layer being selected from one or more of tantalum pentoxide, titanium oxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride, and aluminum fluoride.