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公开(公告)号：US6057821A
公开(公告)日：2000-05-02
申请号：US856720
申请日：1997-05-15
CPC分类号： G09G3/3629 , G09G3/3692 , G09G3/3696 , G09G2310/06 , G09G2310/061 , G09G2310/066 , G09G2320/041
摘要： A passive liquid crystal device (FIG. 1) is driven in a multiplexed manner by a strobe signal (STB) applied in succession to a plurality of row electrodes and data signals (DATa, DATb) applied to a plurality of column electrodes. A resultant signal (RESa, RESb) comprising the combination of the strobe and data signals is applied to the pixels in the device. The liquid crystal device is sensitive to the polarity of the resultant signal. Typically a blanking pulse of a first polarity is applied followed by a resultant signal of the opposite polarity. A first data signal (DATa) is intended to change the state of the relevant pixel (SELECT) while a second data signal (DATa) is intended to leave the pixel in the same state (NON-SELECT). According to the invention the resultant signal (RESa, RESb) comprises at least a portion which is substantially continuously varying. This can be achieved by either or both of the strobe and data signals including such a portion or portions. The invention may provide improved performance of the device through maximisation of the torque applied to the molecules of the liquid crystal during the switching process in response to a SELECT resultant (RESa). The invention is particularly applicable to ferroelectric liquid crystal devices (FLCDs).
摘要翻译： 无源液晶装置（图1）以多个行多个方式通过连续施加到多个行电极的选通信号（STB）和施加到多个列电极的数据信号（DATa，DATb）而被驱动。 包括选通脉冲和数据信号的组合的合成信号（RESa，RESb）被施加到器件中的像素。 液晶装置对所得信号的极性敏感。 通常施加第一极性的消隐脉冲，随后产生相反极性的结果信号。 第一数据信号（DATa）旨在改变相关像素（SELECT）的状态，而第二数据信号（DATa）旨在使像素处于相同状态（NON-SELECT）。 根据本发明，所得到的信号（RESa，RESb）至少包括一个基本连续变化的部分。 这可以通过包括这样的部分或部分的选通脉冲和数据信号中的一个或两者来实现。 本发明可以通过响应于SELECT结果（RESa）在切换过程期间最大化施加到液晶分子的扭矩来提供装置的改进的性能。 本发明特别适用于铁电液晶装置（FLCD）。
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公开(公告)号：US5825344A
公开(公告)日：1998-10-20
申请号：US704785
申请日：1996-09-26
CPC分类号： G09G3/3629 , G09G2310/0205 , G09G2310/06 , G09G2310/061 , G09G2320/0204 , G09G2320/041
摘要： The invention provides an addressing scheme with temperature compensation for temperature induced changes in liquid crystal material switching parameters. Temperature compensation is provided by measuring liquid crystal temperature, and varying the length of strobe waveforms accordingly. A ferroelectric liquid crystal cell is addressed by row and column electrodes forming an x,y matrix of display elements. A strobe waveform is applied to each row in sequence whilst appropriate data waveforms are applied to all the column electrodes. At each display element, the material receives an addressing waveform to switch it to one of its two switched states depending upon the polarity of the addressing waveform. The data waveforms are, e.g., alternating positive and negative pulses of period 2 ts. The strobe waveform has a zero for one time period ts followed by a unipolar voltage pulse of significant duration, e.g., equal to or greater than 0.25 ts or more. This may result in an overlapping of addressing in adjacent rows, e.g., the end of a strobe pulse on one row overlaps with the beginning of a strobe pulse on the next row. The display elements may be switched into one of their two states by one of two strobe pulses of opposite polarity. Alternatively, a blanking pulse may switch all elements to one state and a strobe used to switch selected elements to the other state.
摘要翻译： PCT No.PCT / GB95 / 00417 Sec。 371日期1996年9月26日 102（e）日期1996年9月26日PCT提交1995年2月28日PCT公布。 出版物WO95 / 24715 PCT 日期1995年9月14日本发明提供了一种用于温度补偿的寻址方案，用于温度引起的液晶材料切换参数的变化。 通过测量液晶温度和相应地改变选通波形的长度来提供温度补偿。 铁电液晶单元通过形成显示元件的x，y矩阵的行和列电极来寻址。 每个行按顺序施加选通波形，同时将适当的数据波形应用于所有的列电极。 在每个显示元件上，材料接收寻址波形，以根据寻址波形的极性将其切换到其两个切换状态之一。 数据波形例如是周期2 ts的交替的正脉冲和负脉冲。 频闪波形在一个时间段ts之后具有零，随后是显着持续时间的单极电压脉冲，例如等于或大于0.25tts或更大。 这可能导致相邻行中寻址的重叠，例如，一行上的选通脉冲的结束与下一行上的选通脉冲的开始重叠。 显示元件可以通过相反极性的两个选通脉冲之一切换到它们的两个状态之一。 或者，消隐脉冲可以将所有元件切换到一个状态，并且选通用于将所选元件切换到另一状态。
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