Patents Examined by Tai V. Duong
  • Patent number: 5808714
    Abstract: A very low reflectance optical coating comprising alternating layers of materials such as chromium oxide and chromium, silicon oxide and silicon, titanium oxide and titanium, and tantalum oxide and tantalum is suitable for use as a black shadow mask in liquid crystal displays, among various applications. Certain designs such as silicon oxide/silicon benefit from a transmission-decreasing overcoat of material such as molybdenum, germanium or titanium.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: September 15, 1998
    Assignee: Optical Coating Laboratory, Inc.
    Inventors: Scott F. Rowlands, Scott C. McEldowney, Steven P. Bandettini
  • Patent number: 5808710
    Abstract: Adjacent liquid crystal display tiles are internally electrically interconnected, thereby providing wire escapes for the pixels of the tiles.
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: September 15, 1998
    Assignee: International Business Machines Corporation
    Inventor: Mark Vincent Pierson
  • Patent number: 5808716
    Abstract: A liquid crystal display includes glass cell walls on which are formed alignment layers. The cell is filled with liquid crystal material, such as FLC material. Chemical bonds are formed between the alignment layers and the adjacent liquid crystal layers so that the liquid crystal layers are bonded to the alignment layers in order to increase resistance to mechanical damage.
    Type: Grant
    Filed: October 3, 1995
    Date of Patent: September 15, 1998
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Paul Antony Gass, Michael John Towler, Tomoaki Kuratate, Martin David Tillin, Harald Reinhart Bock, Harry Garth Walton
  • Patent number: 5805253
    Abstract: A liquid crystal display has a bend orientation cell or HAN mode cell and further is provided with an optical compensatory sheet. The optical compensatory sheet shows the minimum of absolute values of retardation values in a direction inclined from the normal of the sheet.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: September 8, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mori, Yoji Ito
  • Patent number: 5805255
    Abstract: A liquid-filled optical device has an optical casing filled with liquid. An agitation device is provided for agitating the liquid in the optical casing so as to effect convection of the liquid. The agitation device comprises a propeller disposed in the liquid in the optical casing, and a rotating device for rotating the propeller.
    Type: Grant
    Filed: February 6, 1996
    Date of Patent: September 8, 1998
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroyuki Mori, Takashi Terai
  • Patent number: 5801795
    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: April 10, 1997
    Date of Patent: September 1, 1998
    Assignee: Hitachi, Ltd.
    Inventor: Masanori Ogino
  • Patent number: 5801793
    Abstract: A reconfigurable backlighting construction for use in portable computer-based systems having direct and projection viewing modes of operation. In the illustrative embodiments of the present invention, the backlighting construction is integrated with a LCD display panel, a micropolarization panel, and a touch-screen writing panel to provide several different types of portable computer-based systems including, for example, a portable notebook computer, a computer-driven image display device, and a portable pen-computing device. In general, each of these computer-based systems are capable of selectively displaying color video images on an actively driven display surface, or projecting such video images onto a wall surface or projection screen without the need for a bulky overhead projector, required by all prior art systems. These computer-based systems can be easily reconfigured for projection viewing without physical removal of the light guiding panel and its light diffusing structures.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: September 1, 1998
    Assignee: Reveo, Inc.
    Inventors: Sadeg M. Faris, Carl Tung
  • Patent number: 5798814
    Abstract: An improved method of driving liquid crystal optical devices utilizing a ferroelectric liquid crystal is described. A ferroelectric liquid crystal material disposed between a pair of substrates in the optical device has an apparent negative dielectric anisotropy at its operational temperatures, e.g. not higher than 40.degree. C. The liquid crystal consists of a number of layers normal to the substrates. The constituent layers consist, in turn, of liquid crystal molecules parallel to the substrates. Misalignment of the molecules yields bends in the layered structure which degrades the contrast ratio. When alternating electric field is given, the molecules are subjected to an electric torque which exerts thereon in order to force the molecules parallel to the substrate by virtue of the apparent negative dielectric anisotropy so that the bends can be removed. It was found that the absolute value of the apparent negative dielectric anisotropy increased as the driving frequency increased.
    Type: Grant
    Filed: August 14, 1996
    Date of Patent: August 25, 1998
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Toshimitsu Konuma
  • Patent number: 5798805
    Abstract: A projection type display apparatus has a light source optical system, a first filter (1), a first aperture (17), a condenser lens (13), a liquid crystal element (15) having a color filter for each pixel, a second aperture (18), a second filter (2), a projection optical system which form a schlieren optical system wherein first and second filters each composed of a spectral element for controlling each color of R, G and B are provided.
    Type: Grant
    Filed: December 20, 1995
    Date of Patent: August 25, 1998
    Assignee: AG Technology Co., Ltd.
    Inventors: Yoshiharu Ooi, Tsuneo Wakabayashi
  • Patent number: 5796452
    Abstract: A liquid crystal display is provided having a plurality of liquid crystal displays arranged in matrix and interconnected to a tile carrier wherein at least one of the individual display tiles has both its X and Y address wiring routed to a single tile edge.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: August 18, 1998
    Assignee: International Business Machines Corporation
    Inventor: Mark Vincent Pierson
  • Patent number: 5790221
    Abstract: A liquid crystal cell comprises two substrates coated with respective alignment layers (polyimide layers). The upper substrate is coated with the polyimide layer but without the orientation process (rubbing process). The lower substrate coated with polyimide layer and rubbed is made by a method including the steps of a first rubbing process on the coated polyimide layer on the substrate, coating the rubbed polyimide layer with a photoresist layer, removing part of the photoresist layer to expose a portion of the rubbed polyimide layer, carrying out a second rubbing process, and then removing the remainder of the photoresist layer. The lower oriented (rubbed) substrate and the upper non-oriented (non-rubbed) substrate are then assembled together to form the liquid crystal cell to improve the scope of the viewing angle and the gray-level order problem.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: August 4, 1998
    Assignee: Industrial Technology Research Institute
    Inventor: Ting-Chiang Hsieh
  • Patent number: 5790212
    Abstract: A thin film transistor-liquid crystal display includes a bottom plate; a common electrode formed on the bottom plate; a top plate; a common electrode formed on the top plate, wherein the bottom and top plates are bonded to each other with the common electrodes of the bottom and top plates electrically connected to each other, and wherein at least one of the common electrodes of the top and bottom plates extends beyond the bond region of the top and bottom plates.
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: August 4, 1998
    Assignee: LG Electronics Inc.
    Inventor: Byoung Ho Lim
  • Patent number: 5786878
    Abstract: A method of manufacturing a liquid crystal display includes the steps of coating an orientation layer on the surfaces of upper and lower substrates, respectively, performing a first rubbing on the surface of the orientation layers of the upper and lower substrates such that the orientation layer is formed in a predetermined direction, performing a second rubbing on the surfaces of orientation layers of the first and second substrates in the opposite direction to the first rubbing direction, and assembling the upper and lower substrates so that the rubbing directions of the substrates are substantially perpendicular.
    Type: Grant
    Filed: November 27, 1995
    Date of Patent: July 28, 1998
    Assignee: LG Electronics Inc.
    Inventor: Wan Soo Kim
  • Patent number: 5784141
    Abstract: A phase spatial light modulator composed of a liquid crystal cell having molecular orientation recorded during the fabrication process as a direct result of a photochemical reaction exerted upon the liquid crystal material, a mechanically-induced change of a liquid crystal alignment layer, or by varying a plurality of polymer materials that compose the liquid crystal alignment layer, thereby affecting the liquid crystal material contained within the cell. The modulator, or scanner, thereby capable of altering the phase, thus steering light passing therethrough. During operation, the liquid crystal molecules deflect the light beam passing therethrough based on their orientation as recorded during fabrication when the applied voltage is "OFF" or in an altered state when the applied voltage is "ON".
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: July 21, 1998
    Assignee: Motorola, Inc.
    Inventors: Diana Chen, Phil Wright, Cheng-Ping Wei
  • Patent number: 5784140
    Abstract: A liquid crystal display has a pair of transparent electrodes, an anti-ferroelectric liquid crystal therebetween, a polarizer and an analyzer attached to the electrodes. The smectic layers are perpendicular to the electrodes and the liquid crystal has a twisted structure. The directors on the surfaces on the two electrodes are symmetrically aligned with respect to the polarization axis of the polarizer so that the average optical axis of the liquid crystal coincides with the polarization axis of the polarizer. In absence of applied electric field, the incident light through the polarizer passes through the liquid crystal slab with maintaining its polarization. However, when an electric field is applied, the liquid crystal molecules experiences some degree of distortion and the average optical axis rotates. Therefore, the incident light passes through the liquid crystal slab with rotating the polarization.
    Type: Grant
    Filed: December 24, 1996
    Date of Patent: July 21, 1998
    Assignee: Samsung Display Devices Co., Ltd.
    Inventor: Sin-Doo Lee
  • Patent number: 5781253
    Abstract: A liquid crystal display, and its manufacturing process, are provided in which antistatic measures are taken in the manufacturing process to prevent the occurrence of static failure before the formation during that process of the short ring. On a glass substrate 2, gate lines 46 are formed. The gate lines 46 are disconnected to form a discharge gap 50 with projections 52 and 54 on both sides of the gap 50. The discharge projections 52 and 54 are positioned substantially at the center of the edges of the disconnected portion of the gate lines 46. A gate insulation film 56 is formed on the gate lines 46 and in the discharge gap 50. Two through holes 58 are made in the gate insulation film 56 in the vicinity of the discharge projections 52 and 54 of each gate line 46. A metal wiring layer 48 is formed on the gate insulation film 56 so as to fill in the through holes 58 where the discharge gap is no longer necessary.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: July 14, 1998
    Assignee: International Business Machines Corporation
    Inventors: Tetsushi Koike, Manabu Kodate, Mitsuru Ikezaki
  • Patent number: 5781268
    Abstract: This invention provides polarization-independent optical filters that are Fabry-Perot filters. The inventive filters incorporate a phase modulator within the FP cavity and two quarter-wave plates, one on either side of the phase modulator, in the cavity. The quarter-wave plates are perpendicular to each other and oriented at .+-.45.degree. with respect to the optic axis of the phase modulator. A variety of phase modulators including those that incorporate nematic and smectic liquid crystal optical modulators can be employed in these FP filters. The filters of this invention are particularly useful in fiber optic systems and in telecommunications applications at 1550 nm.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: July 14, 1998
    Assignee: Board of Regents of the University of Colorado
    Inventors: Jian-Yu Liu, Charles S. Wong, Kristina M. Johnson, Gary D. Sharp
  • Patent number: 5781265
    Abstract: A liquid crystal display according to this invention has a pair of transparent electrodes, a non-chiral smectic liquid crystal therebetween, a polarizer and an analyzer which are attached to the electrodes. The smectic layers are perpendicular to the electrodes and the liquid crystal has a twisted structure where the twist angle is twice the molecular tilt angle. In this configuration, the molecular director is forced to continuously rotate along the cone surface formed by the requirement that the molecules are tilted with respect to the layer normal and pinned at the surfaces. The basic principles of the optical modulation in the present invention are similar to those in twist nematic liquid crystal structures.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: July 14, 1998
    Assignee: Samsung Display Devices Co., Ltd.
    Inventor: Sin-Doo Lee
  • Patent number: 5781266
    Abstract: A ferroelectric liquid crystal display device of the present invention includes: a pair of substrates; a ferroelectric liquid crystal layer provided between the pair of substrates; and an electrode for applying a voltage to the ferroelectric liquid crystal layer, wherein the ferroelectric liquid crystal layer has bent smectic layers, and an effective bend angle .theta.L of the bent smectic layers satisfies the relationship: .theta.Leff>.theta.L>0.degree. in a temperature range in which the ferroelectric liquid crystal display device is stored, where an effective bend angle of the smectic layers in a first state is .theta.Leff, the first state being obtained by cooling the ferroelectric liquid crystal layer from a temperature higher than a phase transition temperature of a chiral smectic C phase--a smectic A phase to a temperature not higher than a phase transition temperature of the chiral smectic C phase--the smectic A phase.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: July 14, 1998
    Assignees: Matsushita Electric Industrial Co., Ltd., Hoechst Aktiengesellschaft
    Inventors: Kenji Nakao, Hiroyuki Ohnishi, Naohide Wakita, Kazuya Nagao, Naomi Takada
  • Patent number: 5777705
    Abstract: A plurality of liquid crystal display tiles arranged in a matrix are electrically interconnected to a tile carrier by wire bonds.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: July 7, 1998
    Assignee: International Business Machines Corporation
    Inventors: Mark Vincent Pierson, Steven F. Arndt, Michael Anthony Gaynes, Lawrence Richard Cutting, David Brian Stone