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Mono-Stable Layer-Tilted Uniform Ferro-Electric Liquid Crystal for Display and Light Valve Applications

IP.com Disclosure Number: IPCOM000041258D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Yang, KH: AUTHOR

Abstract

Uniform, layer-tilted, ferroelectric liquid crystals (FLC) respond equally to either polarity of the electric field with fast switchings speed. The FLC geometry is illustrated in the figure using a layer-tilted uniform state with its spontaneous polarization parallel to the cell substrate as a mono-stable and quiescent state. In this state, the director of FLC is aligned approximately parallel to the cell substrate with a small pretilt angle. The layer-tilt angle, theta, should approximately be equal to the cone angle of the molecular tilt angle within the smectic C layer. Applying an external electric field normal to the cell substrate and pointing upward, the quiescent state will turn into the layer-tilted uniform-up (LTUU) state. When external field is removed, the LTUU state will relax back to the quiescent state.

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Mono-Stable Layer-Tilted Uniform Ferro-Electric Liquid Crystal for Display and Light Valve Applications

Uniform, layer-tilted, ferroelectric liquid crystals (FLC) respond equally to either polarity of the electric field with fast switchings speed. The FLC geometry is illustrated in the figure using a layer-tilted uniform state with its spontaneous polarization parallel to the cell substrate as a mono-stable and quiescent state. In this state, the director of FLC is aligned approximately parallel to the cell substrate with a small pretilt angle. The layer-tilt angle, theta, should approximately be equal to the cone angle of the molecular tilt angle within the smectic C layer. Applying an external electric field normal to the cell substrate and pointing upward, the quiescent state will turn into the layer-tilted uniform-up (LTUU) state. When external field is removed, the LTUU state will relax back to the quiescent state. Similarly, by reversing the electric field, the quiescent state will be switched into the layer-tilted uniform-down (LTUD) state. Upon the removal of the external field, the LTUD state will also relax back to the original quiescent state. The LTUU state has a spontaneous polarization pointing upward within the layer plane and makes an angle, theta, with respect to the normal of the cell substrates. Similarly, the LTUD state has its spontaneous polarization pointing downward but tilted an angle, theta, away from the cell normal.

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