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    BENZOBISTHIAZOLES
    4.
    发明专利
    BENZOBISTHIAZOLES 未知

    公开(公告)号：GB1244766A

    公开(公告)日：1971-09-02

    申请号：GB75871

    申请日：1968-08-26

    Applicant: IBM

    Inventor： CLECAK NICHOLAS JEFFRIES ,  COX ROBERT JAMES ,  SOLAR SAMUEL LOUIS ,  WURSTER HERBERT KLAUS

    IPC: C07D513/04 ,  G03G5/06

    Abstract: 1,244,766. Bisbenzothiazoles. INTERNATIONAL BUSINESS MACHINES CORP. 26 Aug., 1968 [18 Sept., 1967], No. 758/71. Heading C2C. Bisbenzothiazoles of the general formula (wherein R is hydrogen or a lower alkyl group of from 1 to 4 carbon atoms) may be prepared by treating a p - phenylene bisthiourea with bromine and chloroform, and basifying the product. 2,5 - Dimethyl - 1,4 - phenylene bisthiourea is prepared from 2,5 - dimethyl - p - phenylenediamine dihydrochloride and aqueous ammonium thiocyanate.

    9.
    发明专利
    未知

    公开(公告)号：DE3480956D1

    公开(公告)日：1990-02-08

    申请号：DE3480956

    申请日：1984-10-26

    Applicant: IBM

    Inventor： CLECAK NICHOLAS JEFFRIES ,  COX ROBERT JAMES ,  FENG JOSEPH SHAO-YING ,  LEFF JERRY

    IPC: G02F1/13 ,  G02F1/133 ,  G02F1/1335 ,  G02F1/1337

    Abstract: The orientation of the alignment layer in a raster-scanned thermally addressed smectic liquid crystal display device can be chosen relative to the writing orientation to accentuate a selected characteristic. A perpendicular alignment with respect to the scan direction produces uniformly written images in both scan directions to allow high quality bidirectional writing. A perpendicular alignment with respect to the scan direction produces uniformly written images in both scan directions to allow high quality bidirectional writing. Parallel alignment maximizes the contrast in unidirectional writing. Antiparallel alignment increases the selective erase window and improves the resolution in unidirectionally written pages. In a preferred embodiment the liquid crystal cell includes a liquid crystal material comprising 4-octyloxy-4'-cyanobiphenyl 37.5%, 4-decyl-4'-cyanobiphenyl 36.8% weight percent and 4-undecyl-4'-cyanobiphenyl 25.7 weight percent.The drawing shows an LC cell comprising glass substrates 10, 12 having an outer anti reflection coating 8, 21. The substrate 10 carries a second anti reflection coating 10A, a conductive, metal, light absorbing layer 18, the reflective aluminium layer 20, an insulating silicon dioxide layer 19 and the alignment layer 22. The substrate 12 carries the second alignment layer 27 and a transparent conductor layer 24. The laser beam 7 sweeps in a direction perpendicular to the plane of the paper and increments vertically. The alignment layers 22, 27 are put down so that the liquid crystal directors are orientated parallel to the plane of the layers 22, 27 and perpendicular to the sweep direction of the laser beam.

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