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公开(公告)号：EP0749625A1
公开(公告)日：1996-12-27
申请号：EP95909863.0
申请日：1995-02-28
发明人： HUGHES, Jonathan, Rennie , SCATTERGOOD, David, Charles , TOWLER, Michael, John Sharp Labs. of Europe
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 2ts. 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.
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公开(公告)号：EP0744039A1
公开(公告)日：1996-11-27
申请号：EP95907061.0
申请日：1995-01-30
发明人： BRYAN-BROWN, Guy, Peter , McDONNELL, Damien, Gerard , TOWLER, Michael, John Sharp Laboratories of Europe
IPC分类号： G02F1
CPC分类号： G02F1/13378 , G02F1/133512 , G02F1/133753 , G02F1/13394 , G02F2001/133765 , G02F2203/30
摘要： The invention provides a liquid crystal device having an aligned and surface tilted liquid crystal layer contained between two cell walls. The cell walls carry electrodes for applying voltages across the layer thickness to provide a display. The alignment is provided by a layer of a material that undergoes optically induced ordering during cross linking. That is, a material capable of aligning liquid crystal molecules after cross linking with polarised light. One such material is polyvinylcinnamate. The aligning layer is profiled with an asymmetric grating, e.g. approximately sawtooth in cross section by interferometer, oblique incidence photolithography, or embossing. The shape of the grating provides the surface tilt. The liquid crystal material may be nematic, cholesteric, or smetic.
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公开(公告)号：EP0716734A1
公开(公告)日：1996-06-19
申请号：EP94924932.0
申请日：1994-08-26
发明人： BALLS, Roger , BARTLETT, David , WEAVER, Richard
IPC分类号： G01L5
CPC分类号： G01L5/008
摘要： A process monitor (10) for assessment of bending loads (70) encountered during mechanical handling of agricultural and manufactured products with a length (46) to diameter (47) ratio greater than 2:1, for example: sugar beet; has a core (12), and adjacent to a surface (40) piezo-electric plastic material cables (14) wound in a pattern (32, 34, 36, 38) sensitive to the particular processing conditions being monitored. The deflections (71) sustained by the envelope (20) of the process monitor (10) are used to identify situations where bending loads (70) occur which if applied to a real product would cause damage. After calibration against a real product the process monitor (10) is included in a batch of products to be processed. The deflections (71) experienced during handling especially those above a damaging threshold level (73) are monitored and logged within the process monitor (10). Rapid data analysis equipment (76) either external to or contained within the process monitor (10) is used to locate when and where the potentially damaging bending loads (70) occur.
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公开(公告)号：EP0714245A1
公开(公告)日：1996-06-05
申请号：EP94923810.0
申请日：1994-08-18
发明人： APLIN, Judy, Esther Flight Systems Dept. (FS06) , CONNETT, Christopher, Allan Flight Systems Dept. , HAY, Alfred, Elgar Flight Systems Dept. (FS06) , SIDNELL, Patrick, Andrew Ministry of Defence (PE)
CPC分类号： A43B5/0407 , B64D10/00
摘要： An aircraft anti-g system includes a boot (10) having an inflatable lining (13) adjacent an inner surface of an upper (12) and covering a substantial area of a wearer's upper foot and ankle, the lining having means (14, 15) for connecting the lining to a pressurisation supply.
摘要翻译： 一种飞机防g系统包括一个靴子（10），该靴子具有靠近鞋帮（12）的内表面的可膨胀的衬里（13）并覆盖穿用者的上脚和脚踝的大部分区域， ）用于将衬里连接至加压供应。
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公开(公告)号：EP0963569A1
公开(公告)日：1999-12-15
申请号：EP97916534.0
申请日：1997-04-10
发明人： CROSSLAND, William, Alden , DAVEY, Anthony, Bernard , GEAKE, Vincent, Glenn , SPRINGLE, Ian, David
IPC分类号： G02F1
CPC分类号： G02F1/133615 , G02F1/1335 , G02F2001/13756 , G02F2203/09
摘要： A display includes a layer of NCPT liquid crystal material (1) capable of modulating both internal UV radiation (20) and ambient light (30) impinging on the device from the viewing side, in order to combine an emissive function with a reflective function. For emission the UV radiation is selectively applied to phosphors (11) on the viewing side, while for reflection the ambient light is selectively reflected by the liquid crystal. The two functions operate together as each display cell is switched between an 'off' state in which ambient light penetrates the display, being absorbed in a black background (25), while the input radiation is prevented from reaching the phosphors and hence from causing output, and an 'on' state in which the ambient light is scattered from the liquid-crystal layer (thus being visible in daylight) and the input radiation (20), likewise scattered, reaches the phosphor (11) and causes it to emit (thus being visible in the dark).
摘要翻译： 显示器包括一层NCPT液晶材料（1），其能够从观看侧调制撞击在设备上的内部UV辐射（20）和环境光（30）两者，以便将发射功能与反射功能组合。 为了发射，UV辐射选择性地施加到观看侧的荧光体（11），而为了反射，环境光被液晶选择性地反射。 这两个功能一起工作，因为每个显示单元在环境光穿透显示器的“关闭”状态和在黑色背景（25）中被吸收的状态之间切换，同时防止输入辐射到达荧光体并因此导致输出 ，以及环境光从液晶层散射（因此在白天可见）和同样散射的输入辐射（20）到达荧光体（11）并使其发射（开启）状态的“开启”状态 因此在黑暗中可见）。
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公开(公告)号：EP0946992A1
公开(公告)日：1999-10-06
申请号：EP97911348.0
申请日：1997-11-06
发明人： ANTHONY, Carl, John Def. Eval. & Res. Agency , BRUNSON, Kevin, Michael, Def. Eval. & Res. Agency , ELLIOTT, Charles, Thomas, Def. Eval. & Res. Agency , GORDON, Neil, Thomson, Def. Eval. & Res. Agency , PHILLIPS, Timothy, Jonathan, Def Eval & res agency , UREN, Michael, John, Def. Eval. & Res. Agency
IPC分类号： H01L31
CPC分类号： H01L31/1136
摘要： An infra-red detector (10) comprises a detector region (38) and a collector region separated by a barrier region. Operation of these regions is controlled by potentials applied to respective gate electrodes (30, 34, 32), insulated from the detector, barrier and collector regions by an insulating oxide layer (36). The detector, barrier, and collector regions may be arranged on a silicon substrate (24). In operation, photo-excited electrons are generated in the detector region and these cross the barrier region for readout from the collector region.
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公开(公告)号：EP0938727A1
公开(公告)日：1999-09-01
申请号：EP97945008.0
申请日：1997-10-13
CPC分类号： G10L15/10 , G10L15/12 , G10L15/142 , G10L25/15
摘要： A speech processing system (10) incorporates an analogue to digital converter (16) to digitise input speech signals for Fourier transformation to produce short-term spectral cross-sections. These cross-sections are compared with one hundred and fifty reference patterns in a store (34), the patterns having respective stored sets of formant frequencies assigned thereto by a human expert. Six stored patterns most closely matching each input cross-section are selected for further processing by dynamic programming, which indicates the pattern which is a best match to the input cross-section by using frequency-scale warping to achieve alignment. The stores formant frequencies of the best matching pattern are modified by the frequency warping, and the results are used as formant frequency estimates for the input cross-section. The frequencies are further refined on the basis of the shape of the input cross-section near to the chosen formants. Formant amplitudes are produced from input cross-section amplitudes at estimated formant frequencies. The formant frequencies and amplitudes are used with a computer (25) to provide speech indications or with a Hidden Markov Model word matcher (24) to provide word recognition.
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公开(公告)号：EP0927155A1
公开(公告)日：1999-07-07
申请号：EP97926100.0
申请日：1997-06-12
发明人： STYRING, Peter, Liquid Crystal , SAEZ, Isabel, Liquid Crystal , GOUGH, Neil, Liquid Crystal , SINN, Ekkehark, Liquid Crystal , GOODBY, John William, Liquid Crystal
CPC分类号： C08G77/398 , C07F7/0856 , C07F7/21 , C08F30/04 , C09K19/40 , C09K19/406 , C09K19/408
摘要： A group of liquid crystalline compounds defined by Formulas (1) and (2) including polymers, monomers, oligomers and intermediates for their preparation. Also included are symmetric and non-symmetric poly(dimethylsiloxy) compounds having end groups derived from Formulas (1) and (2).
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公开(公告)号：EP0909404A1
公开(公告)日：1999-04-21
申请号：EP97928381.0
申请日：1997-06-30
发明人： COOK, Gary
CPC分类号： H01S3/094034 , G02F1/37 , G02F2001/354
摘要： An harmonic generator system for generating at least two output beams (6a, 6b, 6c) of higher order harmonic radiation from an input beam (1) of radiation of frequency φ comprises at least two non linear optical crystals (3a, 3b, 3c) arranged in series. Radiation output from each crystal stage has first and higher order harmonic components. Chromatic separators (5a, 5b, 5c) separate beams of radiation output from each crystal and selected beams are then passed through a telescope (9a, 9b) to the next crystal in the series, thereby generating further radiation beams of first and higher order harmonics. Multiple beams of second, 2φ, third, 3φ, or fourth, 4φ, harmonic radiation may be output from the system and may be used to pump various stages of a secondary laser system or an optical parametric oscillator. Alternatively, the output beams of higher order harmonic radiation may be coherently combined to form a single output. The system is capable of yielding considerably high conversion efficiencies, approaching 100 %. The system for generating multiple beams of second harmonic radiation preferably comprises a three non linear crystals, for example potassium titanyl phosphate (KTP) or potassium dihydrogen phosphate (KDP), such that three beams of second harmonic radiation are generated. The telescope magnifications may be variable so that the relative intensity of radiation output at each crystal stage may be varied.
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公开(公告)号：EP0894285A1
公开(公告)日：1999-02-03
申请号：EP97916555.0
申请日：1997-04-14
IPC分类号： G02F1
CPC分类号： G02F1/1396 , G02F1/133753 , G02F1/13725 , G02F2001/133742
摘要： A liquid crystal device comprises a layer of nematic or long pitch cholesteric liquid crystal material contained between two cell walls. One wall (A) carries a surface treatment giving a first azimuthal alignment direction with or without a surface pretilt to liquid crystal molecules. The other wall (B) carries a surface treatment (17) capable of separately providing both a preferred, substantially homeotropic alignment of the adjacent liquid crystal, and a defined azimuthal second alignment direction to the adjacent liquid crystal dependent upon liquid crystal molecular arrangement. The first and second alignment directions are approximately orthogonal. The device is formed into an array of separately addressable pixels, e.g. an x, y matrix array. Each pixel may be addressed via an active matrix e.g. thin film transistors, or in an rms. multiplex manner via row and column electrodes. Polarisers may be arranged on either side of the cell walls with their polarisation axes parallel or perpendicular to the two azimuthal directions. Alternatively an amount of dichroic dye may be incorporated in the liquid crystal material, and the device operated with one or two polarisers. The device operates between two different voltage levels, one level providing a non twisted liquid crystal molecular arrangement, the other and higher voltage providing a twisted molecular arrangement. The two polarisers, or dye plus polarisers, distinguishes between the two molecular arrangements in a manner similar to that of prior art twisted nematic devices.
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