Patents by Inventor Alexander D. Jacobson

Alexander D. Jacobson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4443064
    Abstract: There is disclosed a single crystal silicon charge storage apparatus suitable for use in an alternating current driven liquid crystal light valve having therein a moderately doped microchannel stop grid. The charge storage medium is made of a high resistivity substrate on which an MOS capacitor is formed having fast photoelectric transient response and capable of operating over a wide frequency range. A doped microgrid structure is formed in one side of the substrate to prevent charge carrier spreading at the silicon-silicon dioxide interface and to provide a focusing electric field for the charge carriers. The signal from the substrate is electrically coupled through high-reflectivity mirrors and light blocking layers to the liquid crystal.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: April 17, 1984
    Assignee: Hughes Aircraft Company
    Inventors: Jan Grinberg, Michael Waldner, Paul O. Braatz, Alexander D. Jacobson
  • Patent number: 4275410
    Abstract: A large scale parallel architecture in which many parallel channels numbering 10.sup.2 or more operate simultaneously to create a natural and efficient organization for processing two-dimensional arrays of data. The architecture comprises a plurality of stack integrated circuit wafers having top and bottom surfaces, electric signal paths extending through each of the wafers between the surfaces, and micro-interconnects (smaller than 50 mil) on the surfaces of adjacent wafers interconnecting the respective eletric signal paths with a topographical one-to-one correspondence.
    Type: Grant
    Filed: November 29, 1978
    Date of Patent: June 23, 1981
    Assignee: Hughes Aircraft Company
    Inventors: Jan Grinberg, Alexander D. Jacobson, Kuen Chow
  • Patent number: 4239348
    Abstract: There is disclosed a single crystal silicon charge storage apparatus suitable for use in an alternating current driven liquid crystal light valve having therein a moderately doped microchannel stop grid. The charge storage medium is made of a high resistivity substrate on which an MOS capacitor is formed having fast photoelectric transient response and capable of operating over a wide frequency range. A doped microgrid structure is formed in one side of the substrate to prevent charge carrier spreading at the silicon-silicon dioxide interface and to provide a focusing electric field for the charge carriers. The signal from the substrate is electrically coupled through high-reflectivity mirrors and light blocking layers to the liquid crystal.
    Type: Grant
    Filed: November 30, 1979
    Date of Patent: December 16, 1980
    Assignee: Hughes Aircraft Company
    Inventors: Jan Grinberg, Michael Waldner, Paul Q. Braatz, Alexander D. Jacobson
  • Patent number: 4198647
    Abstract: This invention is directed to a semiconductor structure that includes at least one wafer that is fully depleted of all mobile carriers and is used as a medium for the movement of spatially modulated signal represented by charge carriers through the wafer with a spatial resolution that is smaller than the thickness of the wafer. This may be used in the form of a continuous high resolution silicon photodiode substrate to serve as an image input means for an electro-optical display medium, such as a liquid crystal. Next to the photoactivated substrate is a liquid crystal and next to the crystal is a transparent electrode. The photodiode is reverse biased and both of its sides are depleted of all mobile charges throughout its entire thickness. Thus, charges generated in the substrate move to the display not by diffusion as in prior art devices (e.g.
    Type: Grant
    Filed: January 17, 1979
    Date of Patent: April 15, 1980
    Assignee: Hughes Aircraft Company
    Inventors: Jan Grinberg, Alexander D. Jacobson, William P. Bleha, Jr., Paul O. Braatz
  • Patent number: 4191454
    Abstract: There is disclosed a single crystal silicon charge storage apparatus suitable for use in an alternating current driven liquid crystal light valve. The charge storage medium is made of a high resistivity and photosensitive under AC excitation substrate on which an MOS capacitor is formed having fast photoelectric transient response and capable of operating over a wide frequency range. The AC activation provides to a liquid crystal light valve a greatly improved electrochemical stability. Electrically coupled high-reflectivity mirrors and light blocking layers can be used to couple the liquid crystal to the MOS capacitor.
    Type: Grant
    Filed: October 10, 1978
    Date of Patent: March 4, 1980
    Assignee: Hughes Aircraft Company
    Inventors: Paul O. Braatz, Jan Grinberg, Alexander D. Jacobson, Michael Waldner
  • Patent number: 4191452
    Abstract: There is disclosed a single crystal silicon charge storage apparatus suitable for use in an alternating current driven liquid crystal light valve having therein a PIN photodiode structure. The charge storage medium is made of a high resistivity substrate on which an MOS capacitor is formed having fast photoelectric transient response an capable of operating over a wide frequency range. A PIN photodiode structure is provided on one side of the substrate next to the MOS capacitor to deplete the substrate of its mobile charge carriers during a portion of the AC cycle and to collect the electric field-guided signal representing charge carriers that are generated or introduced into the substrate by an input mechanism. The signal from the substrate is electrically coupled through high-reflectivity mirrors and light blocking layers to the liquid crystal.
    Type: Grant
    Filed: December 28, 1977
    Date of Patent: March 4, 1980
    Assignee: Hughes Aircraft Company
    Inventors: Jan Grinberg, Paul O. Braatz, Michael Waldner, Alexander D. Jacobson
  • Patent number: 4127322
    Abstract: 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.
    Type: Grant
    Filed: December 5, 1975
    Date of Patent: November 28, 1978
    Assignee: Hughes Aircraft Company
    Inventors: Alexander D. Jacobson, Jan Grinberg, Donald E. Sprotbery, Donald D. Boswell
  • Patent number: 4093357
    Abstract: There is disclosed an anisotropically conductive interface comprising a plurality of cermet and dielectric layers for use in electro-optical devices to separate a substrate driver from an electro-optical display medium to prevent display light from affecting the driver. The substrate may be a photosensor, a charge coupled device or other matrix addressing circuitry arrangement. In general the substrate is one which can provide spatially modulated voltage and/or current patterns. The display medium may be a liquid crystal, an electro-chromic, an electro-luminescent material or the like. The interface provides direct current conductivity through the interface, insulative maintenance of the spatial modulation of the signal across the interface, light reflectivity, and high attenuation of transmitted light.
    Type: Grant
    Filed: April 5, 1977
    Date of Patent: June 6, 1978
    Assignee: Hughes Aircraft Company
    Inventors: Alexander D. Jacobson, Jan Grinberg, Paul O. Braatz, William P. Bleha, Jr.
  • Patent number: 4019807
    Abstract: 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.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: April 26, 1977
    Assignee: Hughes Aircraft Company
    Inventors: Donald D. Boswell, Jan Grinberg, Alexander D. Jacobson, Gary D. Myer
  • Patent number: 4018509
    Abstract: 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.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: April 19, 1977
    Assignee: Hughes Aircraft Company
    Inventors: Donald D. Boswell, Jan Grinberg, Alexander D. Jacobson, Gary D. Myer