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    • 6. 发明授权
    • Addressing bistable nematic liquid crystal devices
    • 寻址双稳态向列型液晶装置
    • US06784968B1
    • 2004-08-31
    • US09914854
    • 2001-09-13
    • Jonathan R HughesJohn C JonesGuy P Bryan-BrownAlistair Graham
    • Jonathan R HughesJohn C JonesGuy P Bryan-BrownAlistair Graham
    • C09K1902
    • G09G3/3629G09G2310/06
    • A bistable nematic liquid crystal device is addressed by application of a row waveform to successive row electrodes of an x, y matrix of pixels whilst one of two data waveforms are applied to each column electrode. The row waveform has a period of two or more time slots (ts), with two dc pulses of opposite amplitude for causing a switching to a dark state, and two dc pulses of opposite amplitude for causing a switching to a light state. The data waveforms have the same period as the strobe with dc pulses of opposite amplitude and combine with the strobe pulses to switch the device. The device can be addressed in two field periods, one field switching to a dark state, the other field switching to a light state. Alternatively, the device can be blanked to the dark state then selectively switched to the light state. When blanking is used, the row waveform has blanking de pulses placed a short time before selective switching to reduce overall addressing time. Zero voltage pulses may be used within the two or more time slot period of the strobe and data waveforms; these reduce rms. voltages appearing at the pixels and enhance contrast ratio.
    • 通过将行波形应用于x,y矩阵的像素的连续的行电极来解决双稳态向列型液晶装置,同时将两个数据波形中的一个施加到每个列电极。 行波形具有两个或更多个时隙(ts)的周期,具有相反幅度的两个直流脉冲,用于导致暗态切换,以及两个相反幅度的直流脉冲,以导致切换到浅状态。 数据波形与具有相反幅度的直流脉冲的选通脉冲具有相同的周期,并与选通脉冲相结合以切换器件。 该器件可以在两个场周期中寻址,一个场切换到暗状态,另一个场切换到亮状态。 或者,该设备可以被消隐到暗状态,然后选择性地切换到光状态。 当使用消隐时,行波形在选择开关之前放置短时间的消隐脉冲以减少总寻址时间。 可以在选通脉冲和数据波形的两个或更多个时隙周期内使用零电压脉冲; 这些减少rms。 出现在像素处的电压并增强对比度。
    • 7. 发明授权
    • Liquid crystal device
    • 液晶装置
    • US06549256B1
    • 2003-04-15
    • US09117705
    • 1998-08-04
    • Guy P Bryan-BrownCarl V BrownIan C Sage
    • Guy P Bryan-BrownCarl V BrownIan C Sage
    • G02F11337
    • G02F1/1396G02F1/133753G02F1/13725G02F2001/133742
    • A liquid crystal device comprises a layer of nematic or long pitch cholesteric liquid crystal material contained between two cell walls. One wall (A) carries a surface treatment giving a first azimuthal alignment direction with or without a surface pretilt to liquid crystal molecules. The other wall (B) carries a surface treatment (17) capable of separately providing both a preferred, substantially homeotropic alignment of the adjacent liquid crystal, and a defined azimuthal second alignment direction to the adjacent liquid crystal dependent upon liquid crystal molecular arrangement. The first and second alignment directions are approximately orthogonal. Polarisers may be arranged on either side of the cell walls with their polarisation axes parallel or perpendicular to the two azimuthal directions. Alternatively an amount of dichroic dye may be incorporated in the liquid crystal material, and the device operated with one or two polarisers. The device operates between two different voltage levels, one level providing a non twisted liquid crystal molecular arrangement, the other and higher voltage providing a twisted molecular arrangement.
    • 液晶装置包括两个单元壁之间包含的向列型或长距离胆固醇型液晶材料层。 一个壁(A)进行表面处理,给出具有或不具有预倾斜到液晶分子的表面的第一方位取向方向。 另一壁(B)承载能够根据液晶分子排列分别提供相邻液晶的优选的,基本上垂直取向的相对液晶的定向方位第二取向方向的表面处理(17)。 第一和第二取向方向近似正交。 偏振器可以布置在单元壁的任一侧上,其偏振轴平行或垂直于两个方位角方向。 或者,可以在液晶材料中引入一定量的二色性染料,并且该装置用一个或两个偏光镜操作。 该器件在两个不同的电压电平之间工作,一个级别提供非扭曲的液晶分子排列,另一个和更高的电压提供扭曲的分子排列。