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A liquid crystal (LC) mixture in liquid crystal on silicon (LCoS) is the core material for augmented reality (AR) displays. However, a LC mixture with high birefringence (Δ<i>n</i>) and large dielectric anisotropy (Δ<i>ε</i>) possesses high viscosity (<i>γ</i>₁), which results in a slow response time of LCoS devices for AR displays. This work proposes to apply difluorovinyl-based LC diluters to fine balance the low viscosity, high ∆<i>n</i>, and large ∆<i>ε</i> of the LC mixture for a fast response time. Through studying their effects on the key electro-optical properties of a high-∆<i>n</i> LC mixture, it is found that doping these diluter molecules to a high-∆<i>n</i> LC mixture can decrease the viscoelastic coefficient (<i>γ</i>₁/<i>K</i>₁₁), increase ∆<i>ε</i> and the figure of merit, maintain a wide nematic phase temperature range, a high clearing point, and ∆<i>n</i>. It also means that these diluters could effectively regulate the relationship between ∆<i>n</i>, ∆<i>ε</i>, and <i>γ</i>₁ in the LC mixtures to achieve a fine balance of various excellent properties and further improve the LC device’s response time. The widespread applications of these liquid crystal diluters in emerging liquid crystal optical devices are foreseeable.