Patents Examined by Tai V. Duong
  • Patent number: 6088067
    Abstract: A liquid crystal display (LCD) projection system including a projection panel, a light source, and a reflector. The projection panel includes an LCD and a polarizer on one side of the LCD and a reflective polarizer on the other side. The reflective polarizer is a multilayer stack of pairs of adjacent material layers. Each of the layer pairs exhibits a refractive index difference between the adjacent layers in a first direction in the plane of the reflective polarizer and exhibits essentially no refractive index difference between adjacent layers in a second direction in the plane of the reflective polarizer and orthogonal to the first direction. A quarter-wave plate is secured to the reflective polarizer. Light rays from the light source either pass through the reflective polarizer, and on to the LCD, or are reflected back toward the light source, depending on their polarization. Light which is reflected by the reflective polarizer is reflected by the reflector back toward the LCD again.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: July 11, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Stephen J. Willett, Michael F. Weber, Andrew J. Ouderkirk, James M. Jonza
  • Patent number: 6084647
    Abstract: The liquid crystal display device of this invention includes: a plurality of pixels including right-eye pixels and left-eye pixels; a display screen constructed of the plurality of pixels; a first substrate including a first display electrode; a second substrate including a second display electrode arranged to oppose the first display electrode; a polarizing layer disposed in at least one of the first substrate and the second substrate; and a reflection film disposed in one of the first substrate and the second substrate, wherein the polarizing layer has first regions arranged to correspond to the right-eye pixels and second regions arranged to correspond to the left-eye pixels, the first regions selectively transmitting first polarized light while the second regions selectively transmitting second polarized light which is different from the first polarized light.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: July 4, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akitsugu Hatano, Hiroshi Hamada
  • Patent number: 6081305
    Abstract: A liquid crystal light valve for a projection type display such that a pixel circuit area in which a plurality of switching elements are disposed in a matrix state, a drive circuit area in which drive circuit elements are disposed, and the peripheral area are formed on the surface of a semiconductor substrate and further metal layers are provided through insulating layers. The uppermost layer of the metal layers are partitioned by slits to arrange reflectors as output terminals of the switching elements. As middle layers, a shading layer of the pixel circuit area for interrupting an incident light from the slits and a shading layer for interrupting an irradiation to the peripheral area and the drive circuit area are formed. Further, when image data to be displayed in the pixel circuit area has a construction of n.times.m pixels (where, n and m are even numbers), the number of columns and the number of lines are increased by one, respectively, thereby obtaining a construction of (n+1).times.(m+1) pixels.
    Type: Grant
    Filed: May 21, 1996
    Date of Patent: June 27, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Hideo Sato, Shoichi Hirota, Iwao Takemoto, Katsumi Matsumoto
  • Patent number: 6081311
    Abstract: A liquid crystal display apparatus includes a polarization plate, a twisted-mode type liquid crystal layer having coexistent regions with different twisted directions of liquid crystal orientations and different tilt angles of liquid crystal molecules within one pixel, and a compensation layer, having biaxial refractive anisotropy, interposed between the polarization plate and the liquid crystal layer.
    Type: Grant
    Filed: May 14, 1997
    Date of Patent: June 27, 2000
    Assignee: NEC Corporation
    Inventor: Hideya Murai
  • Patent number: 6081309
    Abstract: A liquid crystal device is constituted by a first substrate provided with a plurality of scanning electrodes; a second substrate provided with a plurality of data electrodes and disposed opposite to the first substrate, the data electrodes intersecting the scanning electrodes to form a plurality of pixels; a liquid crystal disposed between the first and second substrates; and a plurality of color filters of first to third colors composed of red, green and blue disposed on one of the first and second substrates. In the device each pixel is constituted by four intersections formed by adjacent two scanning electrodes and adjacent two data electrodes, said four intersections being provided with said color filters of first to third colors.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: June 27, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaaki Suzuki, Masanori Takahashi
  • Patent number: 6067129
    Abstract: An integral indicator or display for a welding lens, which has a twisted nematic liquid crystal cell light shutter, includes plural independently operable twisted nematic liquid crystal cell indicator portions integral with the light shutter twisted nematic liquid crystal cell, indicia associated with respective indicator portions to indicate an operating characteristic of the welding lens, circuitry for operating the lens and the indicator portions, and one or more switches for stepping the circuit through respective settings of operating characteristics, such as shade darkness, sensitivity and delay time. The indicator is dark when the light shutter is dark, and the light shutter may include in optical series with the twisted nematic liquid crystal cell, a birefringent liquid crystal cell light shutter which is faster acting than the twisted nematic liquid crystal cell and can be driven to various shades at respective speeds depending on applied electric field.
    Type: Grant
    Filed: March 15, 1996
    Date of Patent: May 23, 2000
    Assignee: OSD Envizion, Inc.
    Inventor: John D. Fergason
  • Patent number: 6067138
    Abstract: A retardation film made of a polymerized liquid crystal material of the present invention includes: a first region having a first flat surface pattern; and a second region having a second flat surface pattern, wherein a thickness in the first region is different from that in the second region, thereby retardations in the first region and in the second region are different from each other.
    Type: Grant
    Filed: August 9, 1996
    Date of Patent: May 23, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kenji Nishiguchi, Makoto Shiomi
  • Patent number: 6064452
    Abstract: White light is input to light diffracting means so composed as to have a structure including macro prisms combined with a lenticular structure and include diffraction gratings at a microscopic level. As the height (h(x)) of unit steps of said diffraction grating is modulated at every period of arranged pixels, the output diffracted light is decomposed into three primary colors, and guided with highly accurate matching to the three respective primary color pixels of a liquid crystal panel means. In the pitch modulation type diffraction grating of the prior art, it was basically impossible to avoid the defect that the converged positions of a red light ray and a blue light ray deviate about 30%.
    Type: Grant
    Filed: July 22, 1998
    Date of Patent: May 16, 2000
    Assignee: Hitachi, Ltd.
    Inventor: Masanori Ogino
  • Patent number: 6061109
    Abstract: A method of manufacturing a color filter for a multicolor liquid crystal display unit comprises the steps of forming an organic high-polymer color filter layer over a surface of a substrate. A protective film is then formed on the color filter layer and on the surface of the substrate. Thereafter, a thin metal electroless plating film is formed on the protective film. The electroless plating film is then patterned to form a shading film.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: May 9, 2000
    Assignee: Seiko Instruments Inc.
    Inventors: Mitsuru Suginoya, Tsutomu Matsuhira, Toshihiko Harajiri
  • Patent number: 6049370
    Abstract: An improved liquid crystal display cell (34) comprising two substrates (108, 124) spaced apart and containing a quantity of liquid crystal mixture (18) therebetween, in which the substrates have facing surfaces (108', 124') coated with a continuous, electrically conducting material (38, 36), is provided with an array of spacer pads (40) at a pre-selected distance apart from each other, having a pre-selected height to maintain a given spacing between the substrates, and having a pre-selected cross-section that avoids substantial interference with the display properties of the liquid crystal display cell.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: April 11, 2000
    Assignee: Hughes Aircraft Company
    Inventors: Willis H. Smith, Jr., John H. Erdmann, Philip G. Reif
  • Patent number: 6043861
    Abstract: An optical waveguide (5) for use in the in the visible range, the infrared range or the ultraviolet range. The waveguide has two cholesteric liquid crystal polymer layers (10) positioned parallel to each other, forming a gap between them. When electrically modulated to an `on` state, one or more of the cholesteric liquid crystal polymer layers become optically reflective, so that the waveguide becomes internally reflective, allowing a light beam (15) to be transmitted along the waveguide. The liquid crystal polymer is optically non-reflective when electrically modulated to an `off` state. The cholesteric liquid crystal polymer layers are each disposed on a substrate (30) having an electrically conductive layer (35) disposed between the substrate and the cholesteric liquid crystal polymer. A modulating means impresses an electrical signal upon the cholesteric liquid crystal polymer layers to convert them from the optically reflective state to the optically non-reflective state.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 28, 2000
    Assignee: Motorola, Inc.
    Inventor: James Lynn Davis
  • Patent number: 6034755
    Abstract: A liquid crystal display comprises a liquid crystal cell of a bend alignment mode or a hybrid aligned nematic (HAN) mode, one or two optical compensatory sheets and one or two polarizing elements. The liquid crystal cell comprises liquid crystal molecules provided between two electrode substrates. The optical compensatory sheet comprises a transparent substrate and an optically anisotropic layer. The transparent substrate is optically anisotropic. The optically anisotropic layer contains a discotic compound. The liquid crystal cell, the optical compensatory sheet and the transparent substrate have optical characteristics satisfying the following formulas..vertline.(nx1-ny1).times.d1.vertline.-20.ltoreq..SIGMA..vertline.(nx2-ny2) .times.d2.vertline..ltoreq..vertline.(nx1-ny1).times.d1.vertline.+2050.ltoreq.{(n12+n22)/2-n32).times.d2.ltoreq.10000.ltoreq..vertline.(nx3-ny3).times.d3.vertline..ltoreq.200100.ltoreq.{(n13+n23)/2-n33).times.d3.ltoreq.1000The formulas are defined in the specification.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: March 7, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Hidetoshi Watanabe
  • Patent number: 6031591
    Abstract: A liquid-crystal display device has a planar microlens array and a liquid-crystal display panel coupled with the planar microlens array. The planar microlens array comprises an array of convex microlenses provided on a surface of a base glass plate. The array of convex microlenses is made of an ultraviolet-curable synthetic resin having a relatively high refractive index. A cover glass plate is joined to the liquid-crystal display panel and has a peripheral edge bonded to a peripheral edge of the array of convex microlenses. The cover glass plate is spaced from the array of convex microlenses by a hermetically sealed space which is filled with an inactive gas such as dry nitrogen gas, argon gas, or the like. The surfaces of the convex microlenses may be coated with an anti-oxidation film.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: February 29, 2000
    Assignee: Nippon Sheet Glass Co., Ltd.
    Inventor: Kenjiro Hamanaka
  • Patent number: 6028650
    Abstract: In a liquid crystal display apparatus including a plurality of gate lines, a plurality of drain lines, and a plurality of pixels each including a liquid crystal cell having a pixel electrode connected to a storage capacitor and a switching element connected between the liquid crystal cell and one of the drain lines, a gate of the switching element is connected to one of the gate lines, and a capacitance of the storage capacitor is changed in accordance with a distance between said pixel and an input end of a corresponding one of the gate lines.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: February 22, 2000
    Assignee: NEC Corporation
    Inventors: Syoichi Kuroha, Takahiko Watanabe, Wakahiko Kaneko, Osamu Sukegawa
  • Patent number: 6028649
    Abstract: A transportable image display system having direct and projection viewing modes of operation. The image display system comprises a spatial light modulation structure for spatially modulating the intensity of light produced from a light source, and light diffusing panel of electro-optical construction having a light scattering state in which light being transmitted therethrough is scattered in a diffusive manner, and a light transmission state in which light being transmitted therethrough is transmitted without substantial scattering. In the illustrative embodiments, the spatial light modulation structure can be an electrically-addressable LCD panel, or slide-film structures to be viewed. During the direct viewing mode, light produced from the light source is scattered by the light diffusing panel and spatial intensity modulated by the spatial light modulation structure to form a first image for direct viewing.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: February 22, 2000
    Assignee: Reveo, Inc.
    Inventors: Sadeg M. Faris, Le Li
  • Patent number: 6025901
    Abstract: The liquid crystal display device of the invention includes: a first substrate having a first surface, a second surface and at least four side surfaces; a second substrate having a surface opposed to the first surface of the first substrate; a liquid crystal layer interposed between the first surface of the first substrate and the surface of the second substrate; a plurality of pixel electrodes; a plurality of switching elements, each of the switching elements supplying a signal to a corresponding one of the plurality of pixel electrodes; drivers for driving the plurality of switching elements; and a controller for controlling the driver. In the liquid crystal display device, the drivers are provided on the first surface of the first substrate, and the controller is provided above the second surface of the first substrate.
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: February 15, 2000
    Assignees: Sharp Kabushiki Kaisha, Semiconductor Energy Laboratory Co. Ltd.
    Inventors: Masahiro Adachi, Yasuyoshi Kaise, Jun Koyama, Toshimitsu Konuma, Shunpei Yamazaki
  • Patent number: 6005654
    Abstract: The invention concerns a liquid crystal display device intended, in particular, to form a colour image display screen, of the type including: a first substrate which is transparent on a front side situated on the side of the viewer; and a second substrate arranged on a back side facing the first substrate and extending parallel to the latter. The first substrate is connected to the second substrate in order to delimit between them a cavity in which at least one film of liquid crystal is arranged. The liquid crystal has at least a first state in which it reflects the light of a range of wavelengths of a predetermined colour and at least a second state in which it is transparent. The surface of each substrate facing the other substrate includes electrodes to allow the liquid crystal to pass at least from the first state to the second state or conversely, by selective application of a control voltage to the electrodes.
    Type: Grant
    Filed: April 10, 1998
    Date of Patent: December 21, 1999
    Assignee: Asulab S.A.
    Inventors: Peter Kipfer, Hans Peter Herzig, Rolf Klappert, Joachim Grupp
  • Patent number: 6005646
    Abstract: A voltage application driving method is provided for quickly changing the alignment of a liquid crystal layer in thin film transistor liquid crystal displays (TFT/LCD) to a bend alignment. In this driving method, a potential difference larger than 10 V is continuously or intermittently provided between the signal electrode of the liquid crystal cells, and the counter electrode of the display while maintaining the potential difference between the gate electrode and the signal electrode of the cells larger than 10 V.
    Type: Grant
    Filed: December 22, 1997
    Date of Patent: December 21, 1999
    Assignee: International Business Machines Corporation
    Inventors: Hajime Nakamura, Michikazu Noguchi
  • Patent number: 5995180
    Abstract: A liquid crystal display having high brightness and high contrast and being able to achieve a paper-white appearance is provided. The liquid crystal cell is interposed between a pair of polarizing plates. The upper polarizing plate separates an incident light into a reflected light and a transmitted light. A light which would be absorbed when the dichroic polarizing plate is used, is utilized as a reflected light, so that a high brightness can be obtained. The lower polarizing plate partly transmits incident light and absorbs the remaining part. A reflected light from the lower polarizing plate is removed, so that the possible occurrence of a reduction in contrast attributed to the phenomenon that the reflected light is reflected on the upper polarizing plate is prevented. The upper polarizing plate has a flat spectral characteristic with regard to the reflected light and the transmitted light, and a* value and b* value of which plate are each smaller than 1.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: November 30, 1999
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiroyuki Moriwaki, Kazuya Yoshimura, Takeyuki Ashida
  • Patent number: RE36725
    Abstract: A projection-type display device having a single light source which produces light. A first dichroic mirror group receives the light and separates it into colored light. A transmissive light valve system modulates the colored light and a second dichroic mirror group synthesizes the modulated colored light. A projection system projects the synthesized colored light onto a screen.
    Type: Grant
    Filed: August 31, 1995
    Date of Patent: June 6, 2000
    Assignee: Seiko Epson Corporation
    Inventors: Tomio Sonehara, Shuji Aruga, Shinji Morozumi