Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Reexamination Certificate
2004-04-28
2009-12-01
Nguyen, Dung (Department: 2871)
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
C349S034000, C349S113000, C349S114000, C349S119000, C349S136000
Reexamination Certificate
active
07626645
ABSTRACT:
An object of the invention is to satisfactorily present a bright state and a dark state with a low driving voltage without changing a liquid crystal material. A liquid crystal device100having a configuration wherein a polarizing plate11,a liquid crystal layer14and an optical reflective layer15are arranged in this order from the front side of the device. The liquid crystal layer14is capable of providing one retardation when the liquid crystal layer is applied with a predetermined high voltage and providing the other retardation when the liquid crystal layer is applied with a predetermined low voltage, for light that is incident from the polarizing plate11,passes through the liquid crystal layer, reflects on the optical reflective layer15,passes again through the liquid crystal layer14and is guided to the polarizing plate11,whereby a bright state and a dark state are presented based on a difference between these retardations. A thickness of the liquid crystal layer and/or a pre-tilt angle of liquid crystal molecules of the liquid crystal layer is made to be greater than in the case where the one and the other retardations are provided, so that a difference between a first retardation obtained by applying the liquid crystal layer with a modified high voltage lower than the predetermined high voltage and a second retardation obtained by applying the liquid crystal layer with a modified low voltage equal to or higher than the predetermined low voltage, for example is made to be substantially half of wavelength of the light.
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Duong Tai
Liu & Liu
Nguyen Dung
TPO Hong Kong Holding Limited
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