Enlarging the color gamut of liquid crystal displays with a functional reflective polarizer

Abstract

We propose to add a functional reflective polarizer (FRP) in the backlight unit to suppress the crosstalk between red, green and blue color filters of a liquid crystal display (LCD) panel. When incorporated with a commercial two-phosphor-converted white light-emitting diode (2pc-WLED), the color gamut of the LCD can be improved from 92% to 115% NTSC standard, which is comparable to the cadmium-based quantum dot (QD) backlight. If a narrow-band color filter is employed, the color gamut can be further enhanced to 135% NTSC. Our design offers an alternative approach to QDs, while keeping low cost and long lifetime. Such a simple yet efficient approach would find widespread applications for enlarging the color gamut of LCDs.

71‐4: New LCD with 97.3% Rec.2020 color gamut

“…They work together to suppress the unwanted light leakage caused by color filters. FRP is a multi-layer film with alternative refractive indices [16]. Due to the constructive/destructive interferences, it functions as a band-pass filter for both polarization directions (i.e.…”

Transmission Property Analysis of Optically-Anisotropic Dielectric Multilayer for Thin Wide-Viewing-Angle Reflective Polarizer

“…In general, the wavelength of the reflected light depends on the thickness and refractive index of the polymer layer. Equation (8) represents the relationship between the layer thickness and the principal wavelength, λ, for the reflected light.…”

“…The reflective polarizer [1]- [8] has been used to improve the light utilization efficiency of LCDs. Figure 1 shows the operating principle of a reflective polarizer.…”

P‐106: Wide‐Color‐Gamut LCD with a Functional Reflective Polarizer

“…Figure 1(a) shows the transmission spectrum of commonly employed color filters (dashed lines) and the emission spectrum of a 2pc-WLED (solid line) [10]. The RGB color filters exhibit severe crosstalks in the blue-green and yellow spectral regions.…”