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1. 发明授权

US4106853A Method and apparatus for increasing contrast ratio of the stored image in a storage mode light valve 失效
标题翻译：存储模式光阀中存储图像的对比度增加的方法和装置
公开(公告)号：US4106853A
公开(公告)日：1978-08-15
申请号：US709490
申请日：1976-07-28
申请人： Donald D. Boswell
发明人： Donald D. Boswell
IPC分类号： G02F1/135 , G02F1/13
CPC分类号： G02F1/135 , Y10S359/90
摘要： A method and apparatus for increasing the contrast ratio of the output image from a cholestericnematic (storage mode) light valve. The increase in contrast ratio is achieved by applying a low amplitude voltage across the cell at an erasing frequency thereby causing increased scattering of light in the stored image areas and decreased scattering in the clear area.
摘要翻译：一种用于增加来自胆甾型向列（存储模式）光阀的输出图像的对比度的方法和装置。通过以擦除频率在单元上施加低幅度电压来实现对比度的增加，从而在存储的图像区域中引起光的增加的散射并且在透明区域中减少了散射。

2. 发明授权

US4127322A High brightness full color image light valve projection system 失效
公开(公告)号：US4127322A
公开(公告)日：1978-11-28
申请号：US637906
申请日：1975-12-05
申请人： Alexander D. Jacobson , Jan Grinberg , Donald E. Sprotbery , Donald D. Boswell
发明人： Alexander D. Jacobson , Jan Grinberg , Donald E. Sprotbery , Donald D. Boswell
IPC分类号： H04N9/31 , H01J29/89 , G02F1/01 , G03B21/00
CPC分类号： H04N9/3105
摘要： There is disclosed an electro-optical system for real time projection of very high brightness, full color pictorial images from television or other program sources onto a large display screen from a set of three reflection type AC driven field effect mode birefringent liquid crystal light valves each of which modulates a primary color component video image onto a collimated beam of polarized light of a given primary color by modulating the polarization state thereof. In order to achieve very high brightness without overheating the system it is necessary that none of the optical elements forming the projection beam optical system absorb light in carrying out their function. Hence all projection beam optical processes are non-absorptive to first order. The light valves are devices that receive and reflect projection light from an independent high power light source while modulating onto the reflected light video images derived from a low level light source such as a cathode ray tube. The modulation onto the projection beam is achieved by modulating the state of polarization thereof. One such device is used for the red portion of the video image, a second for the green portion and a third for the blue portion. The optical system derives light from a white projection light source, polarizes it, splits it into the three primary colors, directs the three colored beams to the three light valves respectively for image modulation, collects the light that has been modulated by the light valves, recombines the three beams, and projects them onto the screen with sufficient registration to create full color range for the full color image. The optical system uses only a single projection lens and a single polarizing/analyzing beam splitter/recombiner and suitable dichroic mirrors. There is thus provided a simple, compact low weight, high brightness and high efficiency full color light valve image projection system for the projection of high brightness, full color, real time dynamic or static imagery which may include provision for overlay legends or other information as well as possible steroscopic or three dimensional perception by the viewer.

3. 发明授权

US4018509A Optical data processing system with reflective liquid crystal light valve 失效
标题翻译：光学数据处理系统带反光液晶光阀
公开(公告)号：US4018509A
公开(公告)日：1977-04-19
申请号：US664777
申请日：1976-03-08
申请人： Donald D. Boswell , Jan Grinberg , Alexander D. Jacobson , Gary D. Myer
发明人： Donald D. Boswell , Jan Grinberg , Alexander D. Jacobson , Gary D. Myer
IPC分类号： G02B27/46 , G02F1/135 , G02F1/13
CPC分类号： G02B27/46 , G02F1/135
摘要： There is disclosed a high performance coherent optical data processing system using a reflective mode liquid crystal light valve which is particularly suited for application to real-time coherent optical data processing. A preferred example of the system uses a reflective light valve comprising a CdS photoconductor, a CdTe light absorbing layer, a dielectric mirror, and a liquid crystal layer sandwiched between indium-tin-oxide transparent electrodes deposited on optical quality glass flats. The non-coherent light image is directed onto the photoconductor; this reduces the impedance of the photoconductor, thereby switching the AC voltage that is impressed across the electrodes onto the liquid crystal to activate the device. The liquid crystal is operated in a hybrid field effect mode. It utilizes the twisted nematic effect to create a dark off-state (voltage off the liquid crystal) and the optical birefringence effect to create the bright on-state. The liquid crystal thus modulates the polarization of the coherent read-out or projection light responsively to the non-coherent image. An analyzer is used to create an intensity modulated output beam which is projected through a Fourier transform lens onto a screen or other detector means.
摘要翻译：公开了一种使用特别适用于实时相干光数据处理的反射模式液晶光阀的高性能相干光数据处理系统。该系统的优选实例使用包括CdS光电导体，CdTe光吸收层，电介质镜和夹在沉积在光学优质玻璃平板上的铟锡氧化物透明电极之间的液晶层的反射光阀。非相干光图像被引导到光电导体上; 这降低了光电导体的阻抗，从而将跨电极施加的交流电压切换到液晶上以启动该装置。液晶以混合场效应模式运行。它利用扭曲的向列效应产生暗的关闭状态（液晶的电压）和光学双折射效应以产生亮的导通状态。因此，液晶响应于非相干图像调制相干读出或投影光的偏振。分析仪用于产生强度调制的输出光束，其通过傅立叶变换透镜投影到屏幕或其它检测器装置上。

4. 发明授权

US4019807A Reflective liquid crystal light valve with hybrid field effect mode 失效
标题翻译：具有混合场效应模式的反光液晶光阀
公开(公告)号：US4019807A
公开(公告)日：1977-04-26
申请号：US664776
申请日：1976-03-08
申请人： Donald D. Boswell , Jan Grinberg , Alexander D. Jacobson , Gary D. Myer
发明人： Donald D. Boswell , Jan Grinberg , Alexander D. Jacobson , Gary D. Myer
IPC分类号： G02F1/135 , G02F1/139 , G02F1/13
CPC分类号： G02F1/135 , G02F1/139
摘要： There is disclosed a high performance reflective mode liquid crystal light valve suitable for general image processing and projection and particularly suited for application to real-time coherent optical data processing. A preferred example of the device uses a CdS photoconductor, a CdTe light absorbing layer, a dielectric mirror, and a liquid crystal layer sandwiched between indium-tin-oxide transparent electrodes deposited on optical quality glass flats. The non-coherent light image is directed onto the photoconductor; this reduces the impedance of the photoconductor, thereby switching the AC voltage that is impressed across the electrodes onto the liquid crystal to activate the device. The liquid crystal is operated in a hybrid field effect mode. It utilizes the twisted nematic effect to create a dark off-state (voltage off the liquid crystal) and the optical birefringence effect to create the bright on-state. The liquid crystal thus modulates the polarization of the coherent read-out or projection light responsively to the non-coherent image. An analyzer is used to create an intensity modulated output beam.
摘要翻译：公开了一种适用于一般图像处理和投影的高性能反射模式液晶光阀，特别适用于实时相干光数据处理。器件的优选实例使用CdS光电导体，CdTe光吸收层，电介质镜和夹在沉积在光学优质玻璃平板上的铟锡氧化物透明电极之间的液晶层。非相干光图像被引导到光电导体上; 这降低了光电导体的阻抗，从而将跨电极施加的交流电压切换到液晶上以启动该装置。液晶以混合场效应模式运行。它利用扭曲的向列效应产生暗的关闭状态（液晶的电压）和光学双折射效应以产生亮的导通状态。因此，液晶响应于非相干图像调制相干读出或投影光的偏振。分析仪用于产生强度调制输出光束。

5. 发明授权

US4048628A Method and apparatus for erasing scattering in storage-type liquid crystals by frequency sweeping 失效
标题翻译：通过频率扫描对存储型液晶进行散射的方法和装置
公开(公告)号：US4048628A
公开(公告)日：1977-09-13
申请号：US709360
申请日：1976-07-28
申请人： Donald D. Boswell
发明人： Donald D. Boswell
IPC分类号： G02F1/133 , G02F1/135 , G02F1/137 , G02F1/00 , G11C7/00 , G11C11/42
CPC分类号： G02F1/13306 , G02F1/135 , G02F1/137 , G02F2001/13756
摘要： Methods and apparatus for erasing the stored scattering image in storage-type liquid crystal light valves. Erasure is accomplished by applying a signal from an erasing signal source across the liquid crystal cell where the signal is a voltage which is swept over the audio frequency range of 1 KHZ through 20 KHZ. In another embodiment, the erasing signal source supplies a precursor signal which has an initial frequency below the frequency threshold for scattering. This low frequency signal is maintained for a brief period of time to excite the entire liquid crystal cell into a uniform scattering state. The erasing signal is then swept over the audio frequency spectrum of 1 KHZ through 20 KHZ to cause the cell to return to the non-scattered, translucent state.

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