Fig. 1. Basic structure of LCD

Fig. 2. （a）Luminance sensitivity curve of human eye；（b）Color tristimulus value^［16］.

Fig. 3. （a）Spectra of 1p LED，2p LED and RGB LED^［17］；（b）Spectra of GaN LED and red and green CdSe QDs，red and green CdSe InP QDs and red and green CdSe perovskite QDs^{［11，18］}；（c）Relationship between total lumen efficiency，color gamut coverage and emission spectrum of quantum dots^［17］；（d）Transmission curves of two different color filters^［21］；（e）Simulation of total lumen efficiency and color gamut coverage of four different light sources using two different color films in fig.4d^［22］；（f）Color gamut coverage of QD-LCD and 1p LED displays under different ambient light intensities^［22］.

Fig. 4. （a）Isoquality curves of the perceived quality metric^［21］；（b）Magnitude of HK effect with fully saturated monochromatic lights^［24］.

Fig. 5. Structures of QD-LCD in（a）on-chip，（b）on-edge and（c）on-surface mode；（d）Packaging structure of QDSs on-chip；（e）Interface structure of QDs on-edge packaging light bar^{［22，25］}.

Fig. 6. （a）Comparison of fluorescence thermal quenching performance between CdSe red and green QDs synthesized by QD Vision Inc. and commercial phosphors^［26］；（b）Aging curve of CdSe on-chip package under operating conditions^［27］；（c）Changing of peak and FWHM of CdSe QDs and PQDs with temperature rising^{［28，30］}；（d）Fluorescence temperature dependence of PQD@SiN_xO_y^［31］.

Fig. 7. （a）Micro-structure and（b）aging test of QD composite film^［33］

Fig. 8. （a）Schematic diagram of energy band structure and defect location of conventional QDs and PQDs；（b）Hot injection method of conventional QDs and in-situ fabrication method of PQDs；（c）In-situ coating process of PQDs composite films and the corresponding product photos；（d）Aging test of PQDs composite film under storage and working conditions^［37］.

Fig. 9. （a）Structure of direct-lit/mini LED；（b）Preparation method of CdSe QDs；（c）Preparation method of PQDs light guide plate or light diffusion plate^［37］.

Fig. 10. Spectral cross of QDs backlight passing through（a）blue filter film，（b）green filter film and（c）red filter film^［52］；（d）Total lumen efficiency and gamut coverage of QDs backlights with different FWHM^［53］.

Fig. 11. （a）Schematic diagram and working principle of the proposed backlight with an FRP and a patterned half-wave plate，angular-dependent transmission spectra of（b）x-polarized incident light and（c）y-polarized incident light^［53］.

Fig. 12. （a）Basic structure of QDCF display；（b）Comparison of green and blue integrated intensity of QDCF with different thickness excited by GaN LED^［52］.

Fig. 13. （a）Basic structure of the QDCF display cover with the conventional CF layer；（b）Absorption spectra of quantum dots and transmissivity curve of green colored film^［22］；（c）Basic structure of QDCF display combine with SPF；（d）QDs backlight spectrum and transmission curve of short wave projection reflection^［54］.

Fig. 14. （a）Spectra of 4 primary color film；（b）Color gamut coverage of 4 primary color film^［13］.

Fig. 15. （a）TEM images of stretched film section and images of films in different directions under polarized light irradiation^［59］；（b）Tensile pictures of in-situ fabricated PQDs nanocomposite films^［60］；（c）Schematic diagram for an aligned QR film excited by unpolarized blue light.