Quantum Dot Based Enhancement or Elimination of Color Filters for Liquid Crystal Display

The feasibility of quantum dot (QD)-based silicone composites as suitable candidates, in terms of down conversion efficiency, for the replacement or the enhancement of color filters in high-brightness liquid crystal displays is investigated for the first time. It is demonstrated that the replacement of color filters (CFs) with a full color conversion QD composites can lead to an 86.16% enhancement in energy efficiency over the conventional LCD with phosphor-converted white light-emitting diodes and RGB CFs as backlighting. A potential second-type technology utilizing QD-on-CF for color generation is also investigated, and it is found that the energy efficiency enhancement can reach 86.86%. In addition to QDs, the state-of-art red and green phosphors are also investigated for the purpose of enhancement of color filters in LCD displays in terms of down conversion efficiency, and the result shows a 105.78% enhancement in overall down conversion efficiency. The energy efficiency of QD-based color conversion composites can be further improved by optimization of QD dispersion in the resin, which makes them more suitable replacement for color filters in LCDs due to some intrinsic limitations in phosphor materials.