Fenglin Peng

Learn More
Using our new negative Δ LC material in a fringing field switching (n-FFS) cell, we demonstrated superior performances to conventional positive Δ FFS (p-FFS) LCD in transmittance, viewing angle, cell gap sensitivity, gamma curve, while keeping a comparable operation voltage and response time. Therefore, n-FFS has potential to replace p-FFS for(More)
We report high performance liquid crystal displays (LCDs), including fringe field switching (p-FFS) and in-plane switching (pIPS), with a small average dielectric constant (ε) but positive dielectric anisotropy material. Our low ε based p-FFS and pIPS LCDs offer several attractive properties, such as high transmittance, low operation voltage, fast response(More)
We review recent progress in the development of high birefringence (Δn ≥ 0.12) negative dielectric anisotropy (Δε < 0) liquid crystals (LCs) for direct-view and projection displays. For mobile displays, our UCF-N2 (low viscosity, negative Δε, high Δn) based homogeneous alignment fringe-field switching (called n-FFS) mode exhibits superior performance to(More)
Articles you may be interested in Kinetic analysis of image sticking with adsorption and desorption of ions to a surface of an alignment layer Behavior of ion affecting image sticking on liquid crystal displays under application of direct current voltage Generation mechanism of residual direct current voltage in a liquid crystal display and its evaluation(More)
b We report the low temperature and high frequency effects on polymer-stabilized blue phase liquid crystals (BPLCs) comprising of a large dielectric anisotropy nematic host. Debye dielectric relaxation sets a practical limit even when the device operation temperature is still within the blue phase range. To explain these phenomena, we propose a model to(More)
We report three liquid crystal (LC) mixtures with a wide nematic range (−40°C to ~100°C), small visco-elastic coefficient and low activation energy for vehicular displays. Physical properties at different temperatures were characterized. These LCs greatly improve the performance of different display devices in a car: 1) for head-up projection using(More)
We demonstrate two ultra-low viscosity liquid crystal mixtures to enable field-sequential-color wearable displays for low temperature operation, while keeping a wide color gamut. Our mixtures offer ~4X faster response time than a commercial material at 20°C and ~8X faster at −20°C. Other major attractive features include: (1) submillisecond response time at(More)
We propose a new A-film-enhanced fringe field switching (A-FFS) liquid crystal display whose required dΔn value is only λ/4, which is one-half of a conventional FFS. Fast response time can be achieved by either decreasing the cell gap (d) or choosing a low birefringence (Δn) and low-viscosity liquid crystal. The effect of dΔn mismatch between A-film and FFS(More)
We propose a kinetic model to characterize the image sticking phenomenon under nonuniform electric field in fringe field switching (FFS) LCDs by taking material properties and device parameters into account. This model agrees well with the experimental results. We investigate the voltage and temperature effects of image sticking based on this model. The(More)
We report a low-voltage and fast-response polymer network liquid crystal (PNLC) infrared phase modulator. To optimize device performance, we propose a physical model to understand the curing temperature effect on average domain size. Good agreement between model and experiment is obtained. By optimizing the UV curing temperature and employing a large(More)