Patents by Inventor Shoichi Ishihara

Shoichi Ishihara 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).

  • Publication number: 20100149480
    Abstract: A display element according to the present invention is provided with a pair of substrates, at least one of which is transparent; a medium between the substrates, wherein optical anisotropy magnitude of the medium is changeable by and according to an electric field applied thereon; at least one pair of electrodes for applying, on the medium, the electric field substantially parallel to the substrates; and a shielding electrode overlapping at least a display portion of at least one of the substrates, and used for shielding the display element from static electricity.
    Type: Application
    Filed: January 26, 2010
    Publication date: June 17, 2010
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara, Akihito Jinda, Kiyoshi Ogishima
  • Patent number: 7724335
    Abstract: A display element according to the present invention is provided with a pair of substrates, at least one of which is transparent; a medium between the substrates, wherein optical anisotropy magnitude of the medium is changeable by and according to an electric field applied thereon; at least one pair of electrodes for applying, on the medium, the electric field substantially parallel to the substrates; and a shielding electrode overlapping at least a display portion of at least one of the substrates, and used for shielding the display element from static electricity.
    Type: Grant
    Filed: January 19, 2005
    Date of Patent: May 25, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara, Akihito Jinda, Kiyoshi Ogishima
  • Publication number: 20100014040
    Abstract: A display element has an arrangement that allows the pixel to have at least two domains in which the medium shows optical anisotropies of different directions when a force (for example, an electric field) is applied or when no force is applied. It is preferable that directions of the optical anisotropies occurred in the respective domains when the electric field is applied respectively have 45 degrees±10 degrees with absorption axes of polarizers, and that the directions of the optical anisotropies occurred in the respective domains when the electric field is applied make 90 degrees±20 degrees.
    Type: Application
    Filed: September 22, 2009
    Publication date: January 21, 2010
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara
  • Publication number: 20100002158
    Abstract: A liquid crystal panel (10) includes a liquid crystal layer formed with a p-type liquid crystal. The liquid crystal layer exhibits homogeneous orientation while no voltage is applied. Further, an electric field is applied to the liquid crystal layer in a direction same as dipole moments (?) of liquid crystal molecules (3a) to which no voltage is applied. With these arrangements, it is possible to provide a liquid crystal panel and a liquid crystal display device, each of which adopts a new display mode that can achieve a wide viewing angle equivalent to an IPS mode, can achieve a high-speed response like an OCB mode or exceeding the OCB mode, and does not require an initial operation for orientation conversion to the bend orientation.
    Type: Application
    Filed: January 31, 2008
    Publication date: January 7, 2010
    Inventors: Shoichi Ishihara, Takehisa Sakurai, Shuichi Kozaki
  • Patent number: 7639332
    Abstract: A display element includes a dielectric material layer 3, provided between a pair of substrates (substrates 1 and 2), which is made of a medium showing optical isotropy when no electric field is applied and showing optical anisotropy when an electric field is applied. Further, comb-shaped electrodes 4 and 5 are provided face to face on the substrate 1 so as to be positioned in a surface which faces the substrate 2. Furthermore, polarizing plates 6 and 7 are respectively provided on rear surfaces with respect to the counter surfaces of the substrates 1 and 2. Thus, it is possible to realize the display element which has a wide driving temperature range, a wide viewing angle property, and a high-speed response property.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: December 29, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara, Takako Koide
  • Publication number: 20090316098
    Abstract: A liquid crystal panel includes: a p-type liquid crystal material sandwiched by a pair of substrates and comb-teeth shape electrodes for applying, to the p-type liquid crystal material, an electric field parallel to a substrate surface. The p-type liquid crystal material is aligned vertically with respect to the substrate surface at the time when no electric field is applied. The comb-teeth shape electrodes have an electrode width of 5 ?m or less, and an electrode spacing of 15 ?m or less. A product of a dielectric constant anisotropy ?? and a refractive index anisotropy ?n of the p-type liquid crystal material is 1.3 or more and 3.1 or less.
    Type: Application
    Filed: June 17, 2009
    Publication date: December 24, 2009
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Shoichi ISHIHARA, Takehisa Sakurai, Shuichi Kozaki
  • Patent number: 7616280
    Abstract: A display element has a arrangement that allows the pixel to have at least two domains in which the medium shows optical anisotropies of different directions when a force (for example, an electric field) is applied or when no force is applied. It is preferable that directions of the optical anisotropies occurred in the respective domains when the electric field is applied respectively have 45 degrees±10 degrees with absorption axes of polarizers, and that the directions of the optical anisotropies occurred in the respective domains when the electric field is applied make 90 degrees±20 degrees.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: November 10, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara, Takako Koide
  • Publication number: 20090086115
    Abstract: A display element has a arrangement that allows the pixel to have at least two domains in which the medium shows optical anisotropies of different directions when a force (for example, an electric field) is applied or when no force is applied. It is preferable that directions of the optical anisotropies occurred in the respective domains when the electric field is applied respectively have 45 degrees±10 degrees with absorption axes of polarizers, and that the directions of the optical anisotropies occurred in the respective domains when the electric field is applied make 90 degrees±20 degrees.
    Type: Application
    Filed: December 3, 2008
    Publication date: April 2, 2009
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Koichi MIYACHI, Seiji SHIBAHARA, Ichiro INOUE, Shoichi ISHIHARA, Takako KOIDE
  • Patent number: 7474373
    Abstract: A display element has a arrangement that allows the pixel to have at least two domains in which the medium shows optical anisotropies of different directions when a force (for example, an electric field) is applied or when no force is applied. It is preferable that directions of the optical anisotropies occurred in the respective domains when the electric field is applied respectively have 45 degrees±10 degrees with absorption axes of polarizers, and that the directions of the optical anisotropies occurred in the respective domains when the electric field is applied make 90 degrees±20 degrees.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: January 6, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara, Takako Koide
  • Publication number: 20080106689
    Abstract: A display element of the present invention includes: a pair of substrates which are opposed to each other; and a substance layer, which is sandwiched between the substrates, exhibiting an optical isotropy when no electric field is applied, while exhibiting an optical anisotropy when an electric field is applied, and the display element performs display operation by applying an electric field to between the substrates. The substance layer includes a liquid crystalline medium exhibiting a nematic liquid crystal phase, and it is ?n×|??|?1.9, where ?n is a refractive index anisotropy at 550 nm in a nematic phase of the liquid crystalline medium, and |??| is an absolute value of a dielectric anisotropy at 1 kHz in the nematic phase of the liquid crystalline medium. The display element and a display device including the display element realize a fast response speed and a low driving voltage and driving in a wide temperature range.
    Type: Application
    Filed: August 24, 2005
    Publication date: May 8, 2008
    Inventors: Iichiro Inoue, Seiji Shibahara, Koichi Miyachi, Shoichi Ishihara
  • Patent number: 7327433
    Abstract: Each of a pair of substrates respectively comprises an electrode and a rubbed alignment film on one surface, while the other surface is provided with a polarizer. The substrates are placed so that the surfaces provided with the alignment films are opposed to each other, and the area between the substrates is filled with a medium to form a material layer. Then, a medium made of a negative-type liquid crystalline compound sing a photopolymerizable monomer and a polymerization initiator is injected into the material layer held between the substrates. Further, ultra violet irradiation is performed with the medium exhibiting a liquid crystal phase, so that the photopolymerized monomer is polymerized, thus forming a polymer chain. In this manner, obtained is a display element, that causes change in degree of optical anisotropy in response to application of electric (external) field, which display element can be driven by a lower intensity electric (external) field.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: February 5, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Seiji Shibahara, Iichiro Inoue, Shoichi Ishihara, Takako Koide
  • Patent number: 7307685
    Abstract: An electrode is provided on one surface of each of a pair of substrates. On the other surface of each of the substrates, a polarizer is provided. The substrates are assembled together so that their surfaces on which the electrodes are formed face each other. Then, a medium is introduced between the substrates, to form a dielectric material layer. The medium is prepared by mixing a chiral agent in a negative type liquid crystalline compound.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: December 11, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Iichiro Inoue, Seiji Shibahara, Shoichi Ishihara
  • Patent number: 7307682
    Abstract: On one of surfaces of each substrate, an electrode is provided. Then, alignment films, which have been subjected to rubbing treatment, are provided on the respective electrodes so that the alignment films covers the respective electrodes. Moreover, on the other one of the surfaces of each substrate, a polarizer is provided so that its absorption axial direction matches with a rubbing direction of the corresponding alignment film. The substrates face each other so that the rubbing directions of the alignment films respectively provided on the substrates cross each other perpendicularly. A medium having a negative type liquid crystalline property is sealed between the substrates so as to form a material layer. In this way, it is possible to improve contrast and to alleviate coloring phenomenon in a display element in which transmittance is changed by controlling orientational order of molecules.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: December 11, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koichi Miyachi, Iichiro Inoue, Seiji Shibahara, Shoichi Ishihara
  • Publication number: 20070176888
    Abstract: There are disclosed methods for driving liquid crystal display apparatuses for certainly completing in a short time to performing a transition of liquid crystal molecules to a displayable alignment in liquid crystal display apparatuses such that an initial alignment of the liquid crystal molecules is different from the displayable alignment, typically an optically compensated bend mode liquid crystal display apparatus. A voltage is applied to a liquid crystal layer until display area in the liquid crystal layer is transformed to the displayable alignment. After the completion of the transition, a backlight is switched on to shift to a display-driving mode. In order to complete the transition in a short time, voltage pulse under the conditions (such as a frequency and a voltage value) determined in accordance with a temperature of a liquid crystal panel is applied to the liquid crystal layer.
    Type: Application
    Filed: March 27, 2007
    Publication date: August 2, 2007
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuji Hattori, Shoichi Ishihara, Tsuyoshi Uemura, Kenji Nakao, Yoshinori Tanaka, Keisuke Tsuda, Yukio Numata, Mika Nakamura, Junichi Kobayashi
  • Patent number: 7202849
    Abstract: There are disclosed methods for driving liquid crystal display apparatuses for certainly completing in a short time to performing a transition of liquid crystal molecules to a displayable alignment in liquid crystal display apparatuses such that an initial alignment of the liquid crystal molecules is different from the displayable alignment, typically an optically compensated bend mode liquid crystal display apparatus. A voltage is applied to a liquid crystal layer until display area in the liquid crystal layer is transformed to the displayable alignment. After the completion of the transition, a backlight is switched on to sift to a display-driving mode. In order to complete the transition in a short time, voltage pulse under the conditions (such as a frequency and a voltage value) determined in accordance with a temperature of a liquid crystal panel is applied to the liquid crystal layer.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: April 10, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuji Hattori, Shoichi Ishihara, Tsuyoshi Uemura, Kenji Nakao, Yoshinori Tanaka, Keisuke Tsuda, Yukio Numata, Mika Nakamura, Junichi Kobayashi
  • Publication number: 20070070282
    Abstract: A display panel includes (i) a first substrate and a second substrate, which face each other, (ii) a medium layer being sandwiched between the first and second substrate, and (iii) first electrodes and second electrodes being provided on that side of the first substrate which faces the second substrate, the display panel performing display operation by generating an electric field between the first and second electrodes. The display panel is configured such that the medium layer comprises a medium that is optically isotropic when no electric field is applied thereon, and whose optical anisotropy magnitude is changeable by and according to the electric field applied thereon; and the first and second electrodes are transparent electrodes, and a distance between the first and the second electrodes is shorter than a distance between the first substrate and second substrate. This configuration attains gives the display panel high response speed and high transmissivity.
    Type: Application
    Filed: September 20, 2006
    Publication date: March 29, 2007
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Seiji Shibahara, Shoichi Ishihara, Koichi Miyachi
  • Patent number: 7142259
    Abstract: Before starting the regular display in a liquid crystal display device of the bend alignment type, it is necessary to transition all the pixel regions in the entire display portion uniformly from splay alignment into bend alignment. However, conventionally, when applying a simple ac voltage, the transition sometimes does not take place, and when it does take place, the transition time is very long, and display defects due to alignment defects tend to occur. In the method for driving a liquid crystal display device with OCB cells according to the present invention, a step of applying between an electrode 22 and a pixel electrode 23 an ac voltage superimposed with a bias voltage, and a step of applying zero voltage or a low voltage to the substrates are repeated in alternation preceding the begin of the regular display operation and the regular display operation is carried out after all pixels have transitioned into bend alignment.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: November 28, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuji Hattori, Shoichi Ishihara, Hirofumi Kubota, Shin-ichiro Hatta, Katsumi Adachi, Yoshinori Tanaka
  • Publication number: 20060152659
    Abstract: A liquid crystal display according to the invention includes a liquid crystal display element (100) having a liquid crystal layer (4) containing liquid crystal molecules oriented so as to assume a bend alignment when an image display is being made, and at least one retardation plate for compensating for a retardation of the liquid crystal layer, wherein the display is made by varying the retardation of the liquid crystal layer in accordance with video signals inputted from outside to vary the transmittance of the liquid crystal display element to light for display, characterized in that: the liquid crystal display element (100) includes a plurality of red pixels for displaying a red color, a plurality of green pixels for displaying a green color, and a plurality of blue pixels for displaying a blue color; and a thickness (53B) of the liquid crystal layer (4) associated with the blue pixels is larger than a thickness (53R,53G) of the liquid crystal layer associated with the red pixels and/or the green pixels.
    Type: Application
    Filed: March 14, 2006
    Publication date: July 13, 2006
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Shoichi Ishihara, Daiichi Suzuki, Mitsutaka Okita, Kenji Nakao, Yoshinori Tanaka, Tsuyoshi Uemura
  • Patent number: 7057684
    Abstract: A liquid crystal display according to the invention includes a liquid crystal display element (100) having a liquid crystal layer (4) containing liquid crystal molecules oriented so as to assume a bend alignment when an image display is being made, and at least one retardation plate for compensating for a retardation of the liquid crystal layer, wherein the display is made by varying the retardation of the liquid crystal layer in accordance with video signals inputted from outside to vary the transmittance of the liquid crystal display element to light for display, characterized in that: the liquid crystal display element (100) includes a plurality of red pixels for displaying a red color, a plurality of green pixels for displaying a green color, and a plurality of blue pixels for displaying a blue color; and a thickness (53B) of the liquid crystal layer (4) associated with the blue pixels is larger than a thickness (53R, 53G) of the liquid crystal layer associated with the red pixels and/or the green pixels.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: June 6, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shoichi Ishihara, Daiichi Suzuki, Mitsutaka Okita, Kenji Nakao, Yoshinori Tanaka, Tsuyoshi Uemura
  • Patent number: 6950172
    Abstract: A liquid crystal display device having a pair of substrates; a liquid crystal layer disposed between the substrates; and a phase compensator arranged on an outer side of the substrates; wherein, when no voltage is applied, the liquid crystal layer, which has been subjected to a parallel alignment process, is in splay alignment, in which pretilt angles of the liquid crystal at an upper and at a lower boundary of the liquid crystal layer have opposite signs; wherein, before liquid crystal display driving, an initialization process is performed, in which the alignment of the liquid crystal layer is transitioned from splay alignment to bend alignment by application of a voltage; and wherein the liquid crystal display driving is performed in the bend alignment attained by this initialization; including at least one region outside the display pixels where the liquid crystal layer thickness is smaller than inside the display pixels, and that an electric field caused by the application of said voltage, applied to the
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: September 27, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsuji Hattori, Shoichi Ishihara, Hirofumi Kubota, Shin-ichiro Hatta, Katsumi Adachi, Yoshinori Tanaka