Patents by Inventor Teiyu Sako

Teiyu Sako 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: 7385654
    Abstract: A display includes a polarizing member and a reflective display element behind an EL element. The EL element self-emits light to display information and doubles as a display-use light source for the reflective display element. In a sufficiently bright environment, ambient light enters a liquid crystal layer after passing through a frontal substrate of the reflective display element, and is reflected from a metal electrode to produce displays. In addition to the direct light from the EL element, light that enters the liquid crystal layer is simultaneously used. In a dark environment, the EL element emits light, and displayed contents are visible owing to the reflection from the metal electrode as well as directly exiting light.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: June 10, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiichi Mitsui, Masaaki Kabe, Teiyu Sako, Hideki Uchida
  • Patent number: 7176991
    Abstract: A display includes a polarizing member and a reflective display element behind an EL element. The EL element self-emits light to display information and doubles as a display-use light source for the reflective display element. In a sufficiently bright environment, ambient light enters a liquid crystal layer after passing through a frontal substrate of the reflective display element, and is reflected from a metal electrode to produce displays. In addition to the direct light from the EL element, light that enters the liquid crystal layer is simultaneously used. In a dark environment, the EL element emits light, and displayed contents are visible owing to the reflection from the metal electrode as well as directly exiting light.
    Type: Grant
    Filed: November 2, 2004
    Date of Patent: February 13, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiichi Mitsui, Masaaki Kabe, Teiyu Sako, Hideki Uchida
  • Publication number: 20060255706
    Abstract: A display includes a polarizing member and a reflective display element behind an EL element. The EL element self-emits light to display information and doubles as a display-use light source for the reflective display element. In a sufficiently bright environment, ambient light enters a liquid crystal layer after passing through a frontal substrate of the reflective display element, and is reflected from a metal electrode to produce displays. In addition to the direct light from the EL element, light that enters the liquid crystal layer is simultaneously used. In a dark environment, the EL element emits light, and displayed contents are visible owing to the reflection from the metal electrode as well as directly exiting light.
    Type: Application
    Filed: April 7, 2006
    Publication date: November 16, 2006
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Seiichi Mitsui, Masaaki Kabe, Teiyu Sako, Hideki Uchida
  • Patent number: 7102704
    Abstract: A display includes a polarizing member and a reflective display element behind an EL element. The EL element self-emits light to display information and doubles as a display-use light source for the reflective display element. In a sufficiently bright environment, ambient light enters a liquid crystal layer after passing through a frontal substrate of the reflective display element, and is reflected from a metal electrode to produce displays. In addition to the direct light from the EL element, light that enters the liquid crystal layer is simultaneously used. In a dark environment, the EL element emits light, and displayed contents are visible owing to the reflection from the metal electrode as well as directly exiting light.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: September 5, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Seiichi Mitsui, Masaaki Kabe, Teiyu Sako, Hideki Uchida
  • Publication number: 20050088594
    Abstract: A display includes a polarizing member and a reflective display element behind an EL element. The EL element self-emits light to display information and doubles as a display-use light source for the reflective display element. In a sufficiently bright environment, ambient light enters a liquid crystal layer after passing through a frontal substrate of the reflective display element, and is reflected from a metal electrode to produce displays. In addition to the direct light from the EL element, light that enters the liquid crystal layer is simultaneously used. In a dark environment, the EL element emits light, and displayed contents are visible owing to the reflection from the metal electrode as well as directly exiting light.
    Type: Application
    Filed: November 2, 2004
    Publication date: April 28, 2005
    Inventors: Seiichi Mitsui, Masaaki Kabe, Teiyu Sako, Hideki Uchida
  • Patent number: 6844956
    Abstract: A reflective display device includes a switching layer, placed between substrates, for switching between a transmissive state for allowing transmission of incident light and a scattering state for scattering the incident light, and a retro-reflector for reflecting an incident ray from the liquid crystal layer so that an outgoing ray of the reflected light is parallel to the incident ray. A pitch of smallest unit structures of the retro-reflector is set to be larger than 0 mm and not more than 5 mm. The retro-reflector is preferably in a form of a corner cube array and has light absorbing surface portions at borders of the smallest unit structures. With this reflective display device, brightness of white state and contrast ratio can be improved.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: January 18, 2005
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Minoura, Shun Ueki, Masahiko Tomikawa, Teiyu Sako, Masayuki Okamoto, Seiichi Mitsui
  • Publication number: 20040085611
    Abstract: A reflective display device includes a switching layer, placed between substrates, for switching between a transmissive state for allowing transmission of incident light and a scattering state for scattering the incident light, and a retro-reflector for reflecting an incident ray from the liquid crystal layer so that an outgoing ray of the reflected light is parallel to the incident ray. A pitch of smallest unit structures of the retro-reflector is set to be larger than 0 mm and not more than 5 mm. The retro-reflector is preferably in a form of a corner cube array and has light absorbing surface portions at borders of the smallest unit structures. With this reflective display device, brightness of white state and contrast ratio can be improved.
    Type: Application
    Filed: June 30, 2003
    Publication date: May 6, 2004
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Minoura, Shun Ueki, Masahiko Tomikawa, Teiyu Sako, Masayuki Okamoto, Seiichi Mitsui
  • Patent number: 6657766
    Abstract: A reflective display device includes a switching layer, placed between substrates, for switching between a transmissive state for allowing transmission of incident light and a scattering state for scattering the incident light, and a retro-reflector for reflecting an incident ray from the liquid crystal layer so that an outgoing ray of the reflected light is parallel to the incident ray. A pitch of smallest unit structures of the retro-reflector is set to be larger than 0 mm and not more than 5 mm. The retro-reflector is preferably in a form of a corner cube array and has light absorbing surface portions at borders of the smallest unit structures. With this reflective display device, brightness of white state and contrast ratio can be improved.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: December 2, 2003
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kiyoshi Minoura, Shun Ueki, Masahiko Tomikawa, Teiyu Sako, Masayuki Okamoto, Seiichi Mitsui
  • Patent number: 6657700
    Abstract: A reflection-type liquid crystal display device includes upper and lower substrates which respectively have upper and lower electrodes, the upper and lower substrates being arranged in parallel with the upper electrode facing the lower electrode, and a liquid crystal layer sandwiched between the upper and lower substrates, the upper substrate being transparent and having protruding portions adjacent to the liquid crystal layer, each protruding portion having a surface downwardly inclined to defined a prism, the lower substrate having light reflection portions and light absorption portions, wherein when an electric field is applied to the liquid crystal layer, incident light into the upper substrate is selectively directed to the light reflection portions and the light absorption portions by means of the protruding portions and the liquid crystal layer.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: December 2, 2003
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Teiyu Sako, Seiichi Mitsui
  • Publication number: 20020145687
    Abstract: A display includes a polarizing member and a reflective display element behind an EL element. The EL element self-emits light to display information and doubles as a display-use light source for the reflective display element. In a sufficiently bright environment, ambient light enters a liquid crystal layer after passing through a frontal substrate of the reflective display element, and is reflected from a metal electrode to produce displays. In addition to the direct light from the EL element, light that enters the liquid crystal layer is simultaneously used. In a dark environment, the EL element emits light, and displayed contents are visible owing to the reflection from the metal electrode as well as directly exiting light.
    Type: Application
    Filed: February 19, 2002
    Publication date: October 10, 2002
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Seiichi Mitsui, Masaaki Kabe, Teiyu Sako, Hideki Uchida
  • Publication number: 20010040717
    Abstract: A reflective display device includes a switching layer, placed between substrates, for switching between a transmissive state for allowing transmission of incident light and a scattering state for scattering the incident light, and a retro-reflector for reflecting an incident ray from the liquid crystal layer so that an outgoing ray of the reflected light is parallel to the incident ray. A pitch of smallest unit structures of the retro-reflector is set to be larger than 0 mm and not more than 5 mm. The retro-reflector is preferably in a form of a corner cube array and has light absorbing surface portions at borders of the smallest unit structures. With this reflective display device, brightness of white state and contrast ratio can be improved.
    Type: Application
    Filed: March 30, 2001
    Publication date: November 15, 2001
    Inventors: Kiyoshi Minoura, Shun Ueki, Masahiko Tomikawa, Teiyu Sako, Masayuki Okamoto, Seiichi Mitsui
  • Patent number: 6288766
    Abstract: A liquid crystal injecting device has a jig which seals an opening used as a liquid crystal inlet of the cell and another opening used as an air outlet of the cell separately. When obtaining a liquid crystal element by injecting liquid crystal into the cell, the liquid crystal is applied to the inlet before the injection, and after an internal pressure of the cell is reduced by releasing air from the jig, the liquid crystal is injected to the cell by being supplied to the inlet through a liquid crystal supplying tube. During the injection, a temperature of the cell is set to a temperature at which the liquid crystal takes a nematic, cholesteric, or isotropic phase, while air is kept being released. When the injection ends, the liquid crystal is further applied to the inlet and outlet, while being reinjected into the cell through all the openings at room temperature or above under atmospheric pressure or above, after which the cell is cooled.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: September 11, 2001
    Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britanic Majesty's Goverment of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Ryutaro Mashiko, Mitsuhiro Shigeta, Tomoo Furukawa, Teiyu Sako, Hirokazu Sasaki
  • Publication number: 20010004279
    Abstract: A reflection-type liquid crystal display device includes upper and lower substrates which respectively have upper and lower electrodes, the upper and lower substrates being arranged in parallel with the upper electrode facing the lower electrode, and a liquid crystal layer sandwiched between the upper and lower substrates, the upper substrate being transparent and having protruding portions adjacent to the liquid crystal layer, each protruding portion having a surface downwardly inclined to defined a prism, the lower substrate having light reflection portions and light absorption portions, wherein when an electric field is applied to the liquid crystal layer, incident light into the upper substrate is selectively directed to the light reflection portions and the light absorption portions by means of the protruding portions and the liquid crystal layer.
    Type: Application
    Filed: December 15, 2000
    Publication date: June 21, 2001
    Inventors: Teiyu Sako, Seiichi Mitsui
  • Patent number: 6151096
    Abstract: A mixture of a ferroelectric or anti-ferroelectric liquid crystal material and a monomer having a single photopolymeric functional group is injected in the space between two electrode substrates while heat is applied. After cooling of the mixture it is irradiated with ultraviolet light at a temperature at which the liquid crystal material remains in the smectic phase so as to polymerise the monomer. Areas of liquid crystal material requiring different threshold voltages for switching are thereby produced. Alternatively such areas can be produced by changing the conditions applied to a mixture of liquid crystal material with a suitable dopant so as to cause separation of the dopant out of the liquid crystal material in order to provide a polarity of nucleation points for controlling domain formation within the liquid crystal material. Such control of domain formation can be used to provide greyscale in a liquid crystal device.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: November 21, 2000
    Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Damien Gerard McDonnell, John Clifford Jones, Teiyu Sako, Aya Miyazaki, Akira Sakaigawa, Mitsuhiro Koden, Paul Antony Gass, Michael John Towler
  • Patent number: 6118512
    Abstract: A manufacturing method of a liquid crystal display element is provided with the steps of: arranging a pair of insulating substrates face to face with each other and bonding them to each other, each of the insulating substrates having electrodes formed thereon with an alignment film formed in a manner so as to cover the electrodes; and filling the gap between the two substrates with a mixture that is made by mixing a ferroelectric liquid crystal (FLC) composition with isotropic micro structural elements that locally give different threshold-value characteristics to liquid crystal molecules in the liquid crystal composition. With this arrangement, it is possible to provide a liquid crystal layer in which the isotropic micro structural elements are formed into a striped organization with the isotropic micro structural elements being sandwiched between smectic layers of the FLC composition.
    Type: Grant
    Filed: April 24, 1998
    Date of Patent: September 12, 2000
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akira Sakaigawa, Kazuyuki Kishimoto, Mitsuhiro Koden, Teiyu Sako
  • Patent number: 6108061
    Abstract: Monomers with photopolymerization characteristics and an initiator for polymerization are added to a liquid crystal composition having a ferroelectric liquid crystal phase (S5). In a state (S6) where coexist two domains which differ from each other in directions of molecular major axes in the ferroelectric liquid crystal phase, light is projected to the liquid crystal layer to form a polymer reticulate structure therein (S7). As a result, this state is made a stable one and the liquid crystal shows macroscopic switching behaviors among two states causing dark and bright displays respectively, and the above-described state causing halftone display.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: August 22, 2000
    Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the Kingdom of Great Britain and Northern Ireland
    Inventors: Teiyu Sako, Aya Miyazaki, Akira Sakaigawa, Mitsuhiro Koden
  • Patent number: 5897189
    Abstract: A manufacturing method includes a process of once heating a liquid crystal material to a temperature at which an isotropic phase appears therein and then cooling the liquid crystal material, the liquid crystal material being a ferroelectric liquid crystal or antiferroelectric liquid crystal, to be performed under an applied AC electric field which generates an electroclinic effect in a temperature range of from a temperature 20.degree. C. above a phase transition temperature at which a transition in phase occurs from a smectic A phase to a chiral smectic C phase to a temperature 20.degree. C. below the phase transition temperature.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: April 27, 1999
    Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Teiyu Sako, Nobuyuki Itoh, Mitsuhiro Koden, John Clifford Jones
  • Patent number: 5877834
    Abstract: A polymer having spontaneous polarization with the same codes as liquid crystal is introduced into a liquid crystal layer of the smectic liquid crystal cell so that the responding speed is improved (second liquid crystal cell). In another way, a polymer having spontaneous polarization with opposite codes to the liquid crystal is introduced into liquid crystal showing .tau.-V.sub.min characteristic so that a driving voltage is lowered (first liquid crystal cell). These polymers are previously added to a liquid crystal composite before injecting into the liquid crystal cell. In another way, after a photochemically polymeric monomer is added to the liquid crystal composite and the obtained product is injected into the liquid crystal cell, the monomer is polymerized by the projection of a light. Furthermore, the liquid crystal cell into which the polymer is introduced is heated again so as to show I phase and is cooled so that the tone display is realized.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: March 2, 1999
    Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland, The Defence Evaluation and Research Agency
    Inventors: Teiyu Sako, Aya Miyazaki, Akira Sakaigawa, Mitsuhiro Koden
  • Patent number: 5800736
    Abstract: A liquid crystal composition is realized, which composition simultaneously exhibits a negatively large .DELTA..di-elect cons. value suitable to .tau.-Vmin, and SA phase within a sufficient temperature range for realizing a good alignment.A smectic liquid crystal composition containing component (AI), component (B) and/or component (C), expressed by the following formulas: ##STR1## wherein R.sup.1 represents an alkyl group of 1 to 9 carbon atoms, R.sup.2 represents an alkyl group of 1 to 9 carbon atoms, R.sup.3 represents an alkyl group of 1 to 18 carbon atoms, R.sup.4 represents an alkyl group of 1 to 18 carbon atoms, X represents H or F, R.sup.5 represents an alkyl group of 6 to 15 carbon atoms and R.sup.6 represents an alkyl group of 6 to 15 carbon atoms.Ferroelectric liquid crystal material having a negative dielectric anisotropy is applicable to display element utilizing AC-stabilizing effect and .tau.-Vmin.
    Type: Grant
    Filed: January 5, 1998
    Date of Patent: September 1, 1998
    Assignees: Chisso Corporation, Sharp Kabushiki Kaisha
    Inventors: Eiji Okabe, Mayumi Tanabe, Shinichi Saito, Akira Sakaigawa, Hitoshi Takeda, Masami Kido, Takashi Kaneko, Mitshuhiro Koden, Teiyu Sako