Abstract— A reflective‐type polarizer‐free flexible display using a dye‐doped liquid‐crystal (LC) gels is demonstrated. Compared to the conventional guest‐host LC mode, it has high contrast ratio and brightness due to the combining of both scattering and absorption. Such a gel‐like flexible display is bendable and trimable. In this paper, a three‐step switch using distinct dye‐doped LC gels is also demonstrated. The potential applications are e‐paper and decorative displays.
A multi-switch display using gradient dye-doped LC gels which is still polarizer-free, fast response ($10ms in general), and high contrast ($200:1 in general) has demonstrated. By controlling the spatial distribution of the density of polymer networks through fabrication process, gradient dye-doped LC gels can be a multi-switch. The gradient dye-doped LC gel is bright without applied voltage and is dark at a high voltage. It appears the colored pattern when LCs are partially reoriented due to the gradient density of polymer networks. The optical analysis of dye-doped LC gels is also discussed. The potential applications are flexible display and decorative displays.
To improve the electrical performance of power devices, materials used in fabrication need to be analyzed and optimized. By numerical simulations, we reveal that the breakdown voltage (BV) and location of a lateral diffused MOS power device simultaneously depend on trench oxide permittivity. For a given device geometry, while trench oxide permittivity with a certain value leads to a maximal BV, a smaller (larger) value causes electrical breakdown in the Si drift channel around the bottom (top) of the trench. This trend stays the same when Si is replaced by SiC. Our study implies that any byproduct reducing the trench permittivity during trench filling should be avoided.
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