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In this study,we analyze how a backlight’s peak wavelength,full-width at half-maximum (FWHM),and color filters affect the color gamut of a liquid crystal display (LCD) device and establish a theoretical limit,even if the FWHM approaches 1 nm.To overcome this limit,we propose a new backlight system incorporating a functional reflective polarizer and a patted half-wave plate to decouple the polarization states of the blue light and the green/red lights.As a result,the crosstalk between three primary colors is greatly suppressed,and the color gamut is significantly widened.In the experiment,we prepare a white-light source using a blue light-emitting diode (LED) to pump green perovskite polymer film and red quantum dots and demonstrate an exceedingly large color gamut (95.8％ Rec.2020 in Commission intationale de l’éclairage (CIE) 1931 color space and 97.3％ Rec.2020 in CIE 1976 color space) with commercial high-efficiency color filters.These results are beyond the color gamut limit achievable by a conventional LCD.Our design works equally well for other light sources,such as a 2-phosphorconverted white LED.