We present a novel fast bistable nematic cell with intrinsic grey scale. The geometry of a single pixel is the usual sandwich one, with tow conductive flat plates that contain a film of nematic material with positive dielectric anisotropy. An electric field is applied perpendicularly to the boundary plates. This novel deice works by controlling the creation and the erasure of surface defects on a suitable surface when the applied electric field is strong enough to achieve the anchoring breaking condition: $xi $EQ L, where $xi is the coherence length of the electric field and L is the anchoring extrapolation length. Note that these surface defects should disappear onto a usual monostable substrate, due to topological constraints. Particular surface conditions are required to stabilize them. The surface defects depolarize the incident light and, as their density can be modulated, a grey scale can be achieved. Up to now, the maximum measured optical contrast is 200:1. The typical writing and erasing voltages are in the order of 50 Volts for a pulse length of 50 $mu@sec on a sample of 5 $mu@m thickness.
展开▼
机译：我们提出了一种具有内在灰度的新型快体征准细胞。单个像素的几何形状是通常的三明治一，牵引导电平板，其含有具有正电介质各向异性的向列材料薄膜。电场垂直于边界板施加。这种新颖的徒劳通过控制合适表面上的表面缺陷的创造和擦除时，当施加的电场足够强以实现锚定断裂条件：$ xi $ eq l，其中$ xi是电场的相干长度并且L是锚固外推长度。注意，由于拓扑限制，这些表面缺陷应消失在通常的单稳态基板上。需要特定的表面条件来稳定它们。表面缺陷去极化入射光，并且随着它们的密度可以调制，可以实现灰度。到目前为止，最大测量光学对比度为200：1。典型的写入和擦除电压为50伏的脉冲长度为50 $ 50 $ 50 $ 50 $ 50 $ mu @ m厚度的样本。
展开▼
