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    Liquid crystal display element
    1.
    发明授权
    Liquid crystal display element 失效

    公开(公告)号：US3625591A

    公开(公告)日：1971-12-07

    申请号：US3625591D

    申请日：1969-11-10

    Applicant: IBM

    Inventor： FREISER MARVIN J ,  HALLER IVAN

    IPC: G02F1/137 ,  G02F1/26

    CPC classification number: G02F1/1375 ,  Y10T428/10

    Abstract: An electro-optical display device employing a cell comprising a nematic liquid between two glass plates whose inner surfaces have been coated with transparent electrodes. Such coated electrodes are rubbed with a cloth or filter paper so that the liquid crystal film becomes oriented along the direction of rubbing. Such film will be homogeneous and strongly birefringent so that when an electric field is applied to the electrodes of the cell and the latter is viewed between crossed polarizers, a marked contrast in light between the quiescent and active states, respectively, of the cell is observed, even in the presence of ambient illumination of the cell.

    Method and apparatus for selectively exciting a matrix of voltage responsive devices
    2.
    发明授权
    Method and apparatus for selectively exciting a matrix of voltage responsive devices 失效
    用于选择性地激励电压响应装置的矩阵的方法和装置

    公开(公告)号：US3895373A

    公开(公告)日：1975-07-15

    申请号：US47720474

    申请日：1974-06-07

    Applicant: IBM

    Inventor： FREISER MARVIN J ,  TEANEY DALE T

    IPC: G02F1/133 ,  G09G3/36 ,  H04N5/74 ,  G08B5/36

    CPC classification number: G09G3/3622

    Abstract: A method and apparatus for selectively exciting a matrix of voltage responsive devices in which each of said device is responsive to a voltage difference between a row and column drive line. A plurality of row and column drive lines are fed with an AC voltage, the phases of said voltage on said column drive lines being different from the phases on said row drive lines. A device is selectively excited by adjusting the phase of voltage on the row and column drive lines, associated with said selected device, to be equal to each other, and different from either the phases on other column or other row drive lines. The three different phases of voltage available (one on unselected columns, another on unselected rows, the third on the selected row and column) differ in increments of 2 pi /3. In this manner the voltage across a selected device can be reduced to zero without affecting the amplitude of voltage applied to any other device.

    Abstract translation: 一种用于选择性地激励电压响应装置的矩阵的方法和装置，其中每个所述装置响应于行和列驱动线之间的电压差。 多个行和列驱动线被馈送有AC电压，所述列驱动线上的所述电压的相位与所述行驱动线上的相位不同。 通过将与所选择的装置相关联的行和列驱动线上的电压的相位彼此相等地选择性地激励器件，并且不同于其它列或其它行驱动线上的相。 电压可用的三个不同阶段（一个在未选择的列，另一个在未选择的行上，第三个在所选行和列上）以2 pi / 3的增量不同。 以这种方式，所选器件上的电压可以减小到零，而不影响施加到任何其他器件的电压的幅度。

    FAST TURN-OFF NEMATIC LIQUID OPTICAL DEVICES
    6.
    发明专利
    FAST TURN-OFF NEMATIC LIQUID OPTICAL DEVICES 未知

    公开(公告)号：CA1096023A

    公开(公告)日：1981-02-17

    申请号：CA199925

    申请日：1974-05-13

    Applicant: IBM

    Inventor： FREISER MARVIN J

    IPC: B41J2/445 ,  C09K19/20 ,  G02F1/133 ,  G02F1/139 ,  G02F1/13

    Abstract: FAST TURN-OFF NEMATIC LIQUID OPTICAL DEVICES There is disclosed herein a novel nematic liquid crystal optical device of the type wherein the variation of the orientation and the index refraction of the nematic fluid is effected by means of an applied electric field. The device is disposed between crossed polarizers and, in operation, light passing through the device is extinguished when a sufficient voltage is applied to the device to align the bulk of the nematic fluid in the direction of the applied field, the cell being transmissive in the quiescent, parallel aligned state. The device is characterized by relatively fast relaxation times from the driven to the quiescent state, such characterization being imparted to the device by the use as the nematic fluid therein of a nematic material which is operative at room temperature and which has a reversal in sign of its dielectric anisotropy, i.e., a positive-negative dielectric anisotropy material. Such material is one which is constituted of molecules possessing a dipole moment at an angle to the long axis of the molecule, the latter angle depending upon the magnitude of the dipole moment and on the anisotropy of the electron polarizability of the molecule. Examples of such positive-negative anisotropy materials are those represented by the following general structural formula wherein R and S are radicals selected from the group consisting of alkyl radicals having 1 to 12 carbon atoms. YO972-106 -1-

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