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    • 4. 发明授权
    • Liquid crystal display device
    • 液晶显示装置
    • US6061042A
    • 2000-05-09
    • US18427
    • 1998-02-06
    • Hiroyuki TakahashiKenji KameyamaYasuyuki TakiguchiAkihiko KanemotoFuminao MatsumotoKazuya Miyagaki
    • Hiroyuki TakahashiKenji KameyamaYasuyuki TakiguchiAkihiko KanemotoFuminao MatsumotoKazuya Miyagaki
    • G02F1/133G09G3/20G09G3/36
    • G09G3/2011G09G3/3629G09G2300/0486G09G2310/06G09G3/2014
    • A liquid crystal display device includes a liquid crystal display cell having a layer of a twisted-nematic liquid crystal material with a positive dielectric anisotropy constant and constructed such that a plurality of voltage potentials applied to the liquid crystal cell may firstly induce a Freedricksz transition of the liquid crystal material and then select either one of first and second metastable states caused by relaxation of the liquid crystal material succeeding the Freedricksz transition. A first voltage potential is adjusted higher than a threshold voltage necessary to cause changes from an initial state to the metastable states, a second voltage potential to select one of the metastable states is adjusted in comparison with a voltage potential necessary to switch between the metastable states, and a third voltage potential is applied as a modulation voltage during or succeeding the application of the second voltage potential. By applying at least one of these voltage potentials, the modulation of the metastable states can be carried out, thereby causing arbitrary changes in transmittance of the liquid crystal cells and achieving a multilevel gray scale in the liquid crystal display device.
    • 液晶显示装置包括液晶显示单元,该液晶显示单元具有具有正的介电各向异性常数的扭曲向列型液晶材料层,并且构造成使得施加到液晶单元的多个电压电位可以首先引起Freedricksz转换 液晶材料,然后选择由于Freedricksz转变后的液晶材料的弛豫引起的第一和第二亚稳态之一。 调整第一电压电位高于引起从初始状态到亚稳态的变化所需的阈值电压,与在亚稳态之间切换所需的电压电位相比,调整选择亚稳态之一的第二电位电位 并且在施加第二电压电位期间或之后施加第三电压电位作为调制电压。 通过施加这些电压电位中的至少一个,可以进行亚稳态的调制,从而在液晶显示装置中引起液晶单元的透射率的任意变化并实现多层次的灰度级。