To keep up with the intense technological competition with OLED and micro-LED displays, liquid crystal displays (LCD) require innovations to advance. Advanced conversion materials and modified device structures are promising breakthrough points. In this thesis work, a novel color conversion LCD with photoluminescent color filter (PLCF) and in cell polarizer (ICP) are studied. Replacing the traditional pigment based absorptive color filter in LCD, the PLCF can boost LCD efficiency, broaden the display color gamut and improve the viewing angle. However, the integration of PLCF in LCD demands a thin and internal polarizer, which is referred to as in cell polarizer (ICP). The optical properties and technological requirements on the LCD ICP are hardly met by current coatable polarizer techno...[ Read more ]

To keep up with the intense technological competition with OLED and micro-LED displays, liquid crystal displays (LCD) require innovations to advance. Advanced conversion materials and modified device structures are promising breakthrough points. In this thesis work, a novel color conversion LCD with photoluminescent color filter (PLCF) and in cell polarizer (ICP) are studied. Replacing the traditional pigment based absorptive color filter in LCD, the PLCF can boost LCD efficiency, broaden the display color gamut and improve the viewing angle. However, the integration of PLCF in LCD demands a thin and internal polarizer, which is referred to as in cell polarizer (ICP). The optical properties and technological requirements on the LCD ICP are hardly met by current coatable polarizer technologies. The method of developing high performance and stable PLCF are also to be explored. Therefore, the thesis explores the technologies of these two key components, PLCF and ICP. For the PLCF, a method of stabilizing advanced color conversion material, perovskite nanoparticles in color conversion film is explored. Then, by approach of ink jet printing perovskite nanoparticle and semiconductor quantum rod, a full color and stable PLCF array is prepared. The PLCF has large color gamut, good uniformity and high photoluminescence stability. On the other hand, by photoalignment of dichroic azo dye film, ultra-high dichroic ratio (DR > 100:1) and ultra-thin ( < 300 nm) coatable polarizers are invented. The thesis also gives a in-depth study of optical properties of the azo dye polarizer. Complex polarizer structures are designed to optimize its performance. The method of utilizing the azo dye coatable polarizer as LCD in cell polarizer is studied. At last, integrating a PLCF and the azo dye ICP, a novel color conversion LCD is experimentally demonstrated.