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公开(公告)号：US3673572A
公开(公告)日：1972-06-27
申请号：US3673572D
申请日：1969-11-24
Applicant: XEROX CORP
Inventor： SLIVA PHILIP O , DIR GARY A
CPC classification number: H05B33/12 , G09G2300/0885 , H05B33/26
Abstract: An electroluminescent device wherein a memory switch, which requires no holding current or voltage for its maintenance, controls the operation of the electroluminescent layer. When the device is arrayed in a coordinate pattern, individual area of the device can be selectively addressed to form a pattern of visual data.
Abstract translation: 一种电致发光器件，其中不需要用于其维护的保持电流或电压的存储器开关控制电致发光层的操作。 当设备以坐标图案排列时，可以选择性地寻址设备的单个区域以形成视觉数据的图案。
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公开(公告)号：CA976264A
公开(公告)日：1975-10-14
申请号：CA152643
申请日：1972-09-27
Applicant: XEROX CORP
Inventor： WYSOCKI JOSEPH J , BECKER JAMES H , DIR GARY A
Abstract: An imaging system including an imaging layer comprising cholesteric liquid crystalline material in an electrical field capable of having field strengths in the cholesteric nematic phase transition field strength range or the Grandjean to focal-conic texture transformation field strength range of the liquid crystalline imaging material. The imaging material is typically imaged by placing an imagewise phase-transition or texture-transformation inducing electrical field across a layer of imaging material. The present invention controls such an imaging system by maintaining a substantially uniform holding field across the entire surface of the imaging material, said holding field typically being maintained across the imaging material after it has been imaged. The holding field may be applied in the form of various phenomena. The particular type of holding field applied has field strengths below the cholesteric-nematic phase transition or the Grandjean to focal-conic texture transformation field strength thresholds of the imaging material. The imaging system, and especially its image memory and image relaxation characteristics are controlled by varying the strength of the holding field, and by applying field pulses in imagewise configuration to image the liquid crystalline imaging material, or by pulsing the field uniformly across the entire surface of the imaging material to field strengths above the phase-transition threshold or the texture transformation threshold, thereby enhancing the image already formed in the imaging material.
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公开(公告)号：DE3785563D1
公开(公告)日：1993-05-27
申请号：DE3785563
申请日：1987-12-02
Applicant: XEROX CORP
Inventor： DIR GARY A , PERREGAUX ALAIN E
IPC: B41J2/445 , B41J2/485 , G02F1/1335 , G02F1/13363 , G02F1/139 , G02F1/133
Abstract: A transient state liquid crystal image bar (12) having enhanced contrast with lower required driving voltage. The image bar is of the type having a nematic liquid crystal cell configured as a single array of dot shutters energizable by a single frequency voltage with crossed polarizer (14) and analyzer (15). The polarizing axis of the polarizer is at 45 degrees with the liquid crystal molecules (13) in their rest state. Thus, when all the image bar shutters are energized, it is in the non-transmission condition. For bursts of light to pass, the voltage to selected dot shutters is interrupted and reapplied. In one embodiment, the improvement is achieved by an optical compensator (28) or thin prism placed between the polarizer and the liquid crystal cell. In another embodiment, a quarter-wave plate is placed between the liquid crystal cell and the analyzer, with the analyzer being rotated about the image bar's optical axis a predetermined angle from its initial crossed position with respect to the polarizer, so that there is increased extinction of the light exiting from the liquid crystal cell, when the liquid crystal material is in its normally stable energized state.
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公开(公告)号：CA1060977A
公开(公告)日：1979-08-21
申请号：CA265283
申请日：1976-11-09
Applicant: XEROX CORP
Inventor： ADAMS JAMES E , DIR GARY A
IPC: G02F1/1333 , G02F1/1335 , G02F1/135 , G09F9/30 , G02F1/13
Abstract: A direct current liquid crystal display device for reflection viewing comprises a dielectric mirror having at least one pair of titanium dioxide and silicon dioxide layers, the titanium dioxide layer being in contact with a layer of liquid crystalline composition, between two electrodes.
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公开(公告)号：DE68927778D1
公开(公告)日：1997-03-27
申请号：DE68927778
申请日：1989-08-03
Applicant: XEROX CORP
Inventor： SEACHMAN NED J , TAILLIE JOSEPH P , DIR GARY A
Abstract: A liquid crystal birefringent MTF filter 20 is permanently positioned between the lens 18 and the sensor array 15 of an image input scanner 10 to reduce image modulation at frequencies where moiré occurs, with a source of electric potential and a control switch for selectively applying the potential and switching the filter to or from a filtering state. In a variation of the first embodiment, a two-stage MTF filter is used. In a second embodiment, a tunable liquid crystal scattering MTF filter is combined with a full width sensor array.
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Patent Agency Ranking
公开(公告)号：DE3785563T2
公开(公告)日：1993-07-29
申请号：DE3785563
申请日：1987-12-02
Applicant: XEROX CORP
Inventor： DIR GARY A , PERREGAUX ALAIN E
IPC: B41J2/445 , B41J2/485 , G02F1/1335 , G02F1/13363 , G02F1/139 , G02F1/133
Abstract: A transient state liquid crystal image bar (12) having enhanced contrast with lower required driving voltage. The image bar is of the type having a nematic liquid crystal cell configured as a single array of dot shutters energizable by a single frequency voltage with crossed polarizer (14) and analyzer (15). The polarizing axis of the polarizer is at 45 degrees with the liquid crystal molecules (13) in their rest state. Thus, when all the image bar shutters are energized, it is in the non-transmission condition. For bursts of light to pass, the voltage to selected dot shutters is interrupted and reapplied. In one embodiment, the improvement is achieved by an optical compensator (28) or thin prism placed between the polarizer and the liquid crystal cell. In another embodiment, a quarter-wave plate is placed between the liquid crystal cell and the analyzer, with the analyzer being rotated about the image bar's optical axis a predetermined angle from its initial crossed position with respect to the polarizer, so that there is increased extinction of the light exiting from the liquid crystal cell, when the liquid crystal material is in its normally stable energized state.
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公开(公告)号：DE68927778T2
公开(公告)日：1997-07-31
申请号：DE68927778
申请日：1989-08-03
Applicant: XEROX CORP
Inventor： SEACHMAN NED J , TAILLIE JOSEPH P , DIR GARY A
Abstract: A liquid crystal birefringent MTF filter 20 is permanently positioned between the lens 18 and the sensor array 15 of an image input scanner 10 to reduce image modulation at frequencies where moiré occurs, with a source of electric potential and a control switch for selectively applying the potential and switching the filter to or from a filtering state. In a variation of the first embodiment, a two-stage MTF filter is used. In a second embodiment, a tunable liquid crystal scattering MTF filter is combined with a full width sensor array.
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公开(公告)号：DE3485607D1
公开(公告)日：1992-04-30
申请号：DE3485607
申请日：1984-02-10
Applicant: XEROX CORP
Inventor： DIR GARY A
IPC: G02F1/13 , G02F1/1335 , G02F1/13357 , G02F1/137 , G02F1/139 , G02F1/133
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公开(公告)号：CA1216052A
公开(公告)日：1986-12-30
申请号：CA445069
申请日：1984-01-11
Applicant: XEROX CORP
Inventor： DIR GARY A
IPC: G02F1/1335 , G02F1/137 , G02F1/139 , G02F1/133
Abstract: A liquid cyrstal display device having high extinction ratio polarizers on the input and output sides of a transmissive, twisted nematic liquid crystal cell. The liquid crystal cell incorporating a dichroic dye which is admixed with the liquid crystal material. The high extinction ratio polarizers get the full contrast and density capability from the liquid crytal cell while the dichroic dye prevents the buildup of the contrast limiting orthogonal mode of the polarized light passing therethrough, thus, further increasing the optical contrast and density. Such an arrangement provides optical contrasts of around 150:1 with a 10 micron thick liquid cyrstal cell.
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公开(公告)号：DE2256258A1
公开(公告)日：1973-06-07
申请号：DE2256258
申请日：1972-11-16
Applicant: XEROX CORP
Inventor： WYSOCKI JOSEPH J , BECKER JAMES H , DIR GARY A
Abstract: An imaging system including an imaging layer comprising cholesteric liquid crystalline material in an electrical field capable of having field strengths in the cholesteric nematic phase transition field strength range or the Grandjean to focal-conic texture transformation field strength range of the liquid crystalline imaging material. The imaging material is typically imaged by placing an imagewise phase-transition or texture-transformation inducing electrical field across a layer of imaging material. The present invention controls such an imaging system by maintaining a substantially uniform holding field across the entire surface of the imaging material, said holding field typically being maintained across the imaging material after it has been imaged. The holding field may be applied in the form of various phenomena. The particular type of holding field applied has field strengths below the cholesteric-nematic phase transition or the Grandjean to focal-conic texture transformation field strength thresholds of the imaging material. The imaging system, and especially its image memory and image relaxation characteristics are controlled by varying the strength of the holding field, and by applying field pulses in imagewise configuration to image the liquid crystalline imaging material, or by pulsing the field uniformly across the entire surface of the imaging material to field strengths above the phase-transition threshold or the texture transformation threshold, thereby enhancing the image already formed in the imaging material.
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