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    • 6. 发明授权
    • Drive scheme for a cholesteric liquid crystal display device
    • 胆甾型液晶显示装置的驱动方案
    • US08013819B2
    • 2011-09-06
    • US11798184
    • 2007-05-10
    • Amir Ben-ShalomLahav LangboimIlan FeldmanDavid Coates
    • Amir Ben-ShalomLahav LangboimIlan FeldmanDavid Coates
    • G09G3/36
    • G09G3/3629G09G3/2014G09G3/2077G09G2300/0486G09G2330/021
    • A cholesteric liquid crystal display device comprises three cells each comprising a layer of cholesteric liquid crystal material and an electrode arrangement capable of providing independent driving of a plurality of pixels across the layer of cholesteric liquid crystal material by respective drive signals. A drive circuit applies a respective drive signal to each pixel to drive the pixel into states which are variable to provide a reflectance varying within a predetermined range of reflectances. The drive signals involve a combination of two drive schemes to provide reflectances in different portions of the range. In particular, (a) when providing a reflectance in a first portion of higher reflectance, the drive signals comprise a first waveform shaped to drive the pixel into a stable state, the waveform having a shape which is variable to provide a stable state having a varying reflectance; and (b) when providing a reflectance in a second portion of lower reflectance, the drive signals comprise a second waveform shaped to drive the pixel into the homeotropic state and the planar state alternately, the periods of time during which the pixel is driven into the homeotropic and planar states being variable to provide a varying average reflectance as perceived by a viewer. Such a combination of drive schemes allows a good contrast ratio and color gamut to be achieved because of the use of the homeotropic state but only increases the power consumption by a relatively small amount as the homeotropic state is only used for a portion of the pixels.
    • 胆甾醇型液晶显示装置包括三个单元,每个单元包括胆甾型液晶材料层和能够通过相应的驱动信号提供穿过胆甾型液晶材料层的多个像素的独立驱动的电极装置。 驱动电路将相应的驱动信号施加到每个像素以将像素驱动到可变的状态,以提供在预定反射范围内变化的反射率。 驱动信号涉及两个驱动方案的组合,以在该范围的不同部分提供反射。 特别地,(a)当在较高反射率的第一部分中提供反射率时,驱动信号包括成形为将像素驱动到稳定状态的第一波形,该波形具有可变的形状,以提供具有 变化反射率; 和(b)当在较低反射率的第二部分中提供反射率时,驱动信号包括形状为将像素驱动成垂直状态和平面状态的第二波形,其中像素被驱动到 垂直和平面状态是可变的,以提供观察者感觉到的变化的平均反射率。 驱动方案的这种组合允许由于使用垂直状态而实现良好的对比度和色域,而仅仅将像素的一部分使用垂直状态,而仅增加功率消耗相对较小的量。
    • 7. 发明授权
    • Distinct color LCD apparatus
    • 独特的彩色液晶显示设备
    • US07719501B2
    • 2010-05-18
    • US10529377
    • 2003-09-30
    • Amir Ben-ShalomDavid Coates
    • Amir Ben-ShalomDavid Coates
    • G09G3/36
    • G02F1/13718G02F2001/13478G09G3/3607G09G3/3629G09G2300/0486G09G2310/06
    • A distinct color LCD apparatus including at least two layers of respectively disparate encapsulated liquid crystal materials; Structural means for maintaining said layers proximate to each other and in a substantially parallel orientation; Electrically conductive means for addressing at least one substantially parallel address across the encapsulated liquid crystal material in each of the respective layers; and Coordinated with said means for addressing, an electrical pulse driving means (I) wherein a state is selected from the list Homeouopre and planar and (U) whereby said state is communicated to a predetermined address between one of said parallel layers.
    • 一种独特的彩色液晶显示装置,包括至少两层分别不同的封装液晶材料; 用于将所述层保持彼此靠近并且基本上平行取向的结构装置; 导电装置,用于在每个相应层中的封装液晶材料之间寻址至少一个基本上平行的地址; 并且与所述寻址装置协调,电脉冲驱动装置(I),其中从所述列表中选择状态,并且平面和(U),从而所述状态被传送到所述并行层之一之间的预定地址。
    • 8. 发明申请
    • Drive scheme for a cholesteric liquid crystal display device
    • 胆甾型液晶显示装置的驱动方案
    • US20080042959A1
    • 2008-02-21
    • US11798184
    • 2007-05-10
    • Amir Ben-ShalomLahav LangboimIlan FeldmanDavid Coates
    • Amir Ben-ShalomLahav LangboimIlan FeldmanDavid Coates
    • G09G3/36G02F1/137
    • G09G3/3629G09G3/2014G09G3/2077G09G2300/0486G09G2330/021
    • A cholesteric liquid crystal display device comprises three cells each comprising a layer of cholesteric liquid crystal material and an electrode arrangement capable of providing independent driving of a plurality of pixels across the layer of cholesteric liquid crystal material by respective drive signals. A drive circuit applies a respective drive signal to each pixel to drive the pixel into states which are variable to provide a reflectance varying within a predetermined range of reflectances. The drive signals involve a combination of two drive schemes to provide reflectances in different portions of the range. In particular, (a) when providing a reflectance in a first portion of higher reflectance, the drive signals comprise a first waveform shaped to drive the pixel into a stable state, the waveform having a shape which is variable to provide a stable state having a varying reflectance; and (b) when providing a reflectance in a second portion of lower reflectance, the drive signals comprise a second waveform shaped to drive the pixel into the homeotropic state and the planar state alternately, the periods of time during which the pixel is driven into the homeotropic and planar states being variable to provide a varying average reflectance as perceived by a viewer. Such a combination of drive schemes allows a good contrast ratio and colour gamut to be achieved because of the use of the homeotropic state but only increases the power consumption by a relatively small amount as the homeotropic state is only used for a portion of the pixels.
    • 胆甾醇型液晶显示装置包括三个单元,每个单元包括胆甾型液晶材料层和能够通过相应的驱动信号提供穿过胆甾型液晶材料层的多个像素的独立驱动的电极装置。 驱动电路将相应的驱动信号施加到每个像素以将像素驱动到可变的状态,以提供在预定反射范围内变化的反射率。 驱动信号涉及两个驱动方案的组合,以在该范围的不同部分提供反射。 特别地,(a)当在较高反射率的第一部分中提供反射率时,驱动信号包括成形为将像素驱动到稳定状态的第一波形,该波形具有可变的形状,以提供具有 变化反射率; 和(b)当在较低反射率的第二部分中提供反射率时,驱动信号包括形状为将像素驱动成垂直状态和平面状态的第二波形,其中像素被驱动到 垂直和平面状态是可变的,以提供观察者感觉到的变化的平均反射率。 驱动方案的这种组合允许由于使用垂直状态而实现良好的对比度和色域,而仅仅将像素的一部分使用垂直状态,而仅增加功率消耗相对较小的量。