Liquid crystal display element
    1.
    发明授权

    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

    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.

    Additive for liquid crystal material
    3.
    发明授权
    Additive for liquid crystal material 失效
    液体材料添加剂

    公开(公告)号:US3656834A

    公开(公告)日:1972-04-18

    申请号:US3656834D

    申请日:1970-12-09

    Applicant: IBM

    CPC classification number: C09K19/56 G02F1/133703 G02F1/1375

    Abstract: A nematic liquid crystal material which assumes a homeotropic texture is provided by dissolving an additive material having the formula RR3''N X wherein R is an alkyl radical having 10 to 24 carbon atoms, R'' is a methyl or ethyl radical, and X is an anion derived from a simple acid, in a nematic material. A typical example of the additive is hexadecyltrimethylammonium bromide. The homeotropic texture provided by this composition, when placed between two conducting transparent plates, is readily deformed by a voltage applied to the plates and can thereby be utilized to control the transmission of light.

    Abstract translation: 通过溶解具有式RR3'N + X的其中R是具有10-24个碳原子的烷基的添加剂材料,R'是甲基或乙基,提供具有垂直组织的向列型液晶材料 自由基,X - 是由向列型材料中的简单酸衍生的阴离子。 添加剂的典型实例是十六烷基三甲基溴化铵。 当通过这种组合物提供的,由两种导电透明板之间提供的垂直纹理容易因施加在该板上的电压而变形,从而可用于控制光的透射。

    9.
    发明专利
    未知

    公开(公告)号:DE2628467A1

    公开(公告)日:1977-01-27

    申请号:DE2628467

    申请日:1976-06-25

    Applicant: IBM

    Abstract: A positive resist image is produced by exposing, to radiation in a predetermined pattern, a polymeric material containing polymerized alkyl methacrylate units and polymerized monoethylenically unsaturated acid units. The exposed and unexposed areas are distinguished by their different respective abilities to be swelled in an appropriate swelling agent, and the swelled areas are removed by dispersal in a nonsolvent liquid.

    10.
    发明专利
    未知

    公开(公告)号:DE2338281A1

    公开(公告)日:1974-02-21

    申请号:DE2338281

    申请日:1973-07-27

    Applicant: IBM

    Abstract: 1395678 Liquid crystal compositions INTERNATIONAL BUSINESS MACHINES CORP 4 July 1973 [3 Aug 1972] 31854/73 Heading C4X [Also in Division C2] To a nematic liquid crystal material is added an organic dopant which provides ions in which the charge is effectively distributed over several atoms and is shielded from the charge of the counterions by a non-poar shell, whereby the resistivity of the nematic material is reduced, and as described in relation to dynamic scattering materials, the threshold voltage is reduced and the cut-off frequency raised. In some cases the undoped material does not exhibit dynamic scattering. The dopant, preferably forming 0À01 to 5% by weight of the composition, may contain large organic ions, or be a precursor thereof, or may be a compound containing chelated alkali metal ions. In the latter class the chelating agent may be dicyclohexyl-18-crown- 6 ether such being reacted with any one of a number of alkali metal salts of organic anions, or the dibenzo-18-crown-6 ether analogues. The former class appears to consist of generally unrelated materials, e.g. hexaphenylethane; tetrabutylammonium tetraphenylforide; and quinhydrone. The dopant may also be tributylphosphine oxide lithium bromide or triphenylphosphine oxide lithium bromide.

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