Patents by Inventor Mitsutaka Okita

Mitsutaka Okita 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: 20140368773
    Abstract: According to one embodiment, a liquid crystal display device includes array substrate, counter substrate and liquid crystal layer. The array substrate includes a plurality of pixel electrodes, a plurality of gate lines, a plurality of source lines, a plurality of switching elements, a gate driver, and a source driver. The counter substrate includes a color filter. In each frame period, gradation signals of given polarity are applied to a plurality of pixel electrodes facing the transparent filter, while gradation signals of the reverse polarity are applied to a plurality of pixel electrodes facing the green filter.
    Type: Application
    Filed: June 6, 2014
    Publication date: December 18, 2014
    Applicant: Japan Display Inc.
    Inventors: Mitsutaka OKITA, Kazuhiro Nishiyama
  • Publication number: 20140176885
    Abstract: According to one embodiment, a liquid crystal display device includes an array substrate, an opposed substrate and a liquid crystal layer. The array substrate includes a first line, a second line, a light shielding pattern, a first pixel electrode, and a second pixel electrode. The opposed substrate includes a light shielding layer, a first colored layer, and a second colored layer.
    Type: Application
    Filed: December 23, 2013
    Publication date: June 26, 2014
    Applicant: JAPAN DISPLAY INC.
    Inventors: Mitsutaka OKITA, KAZUHIRO NISHIYAMA
  • Publication number: 20140078453
    Abstract: According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a first electrode, a stage including an electrode formation surface, a switching element, a second electrode and a first vertical alignment film. The second substrate includes a third electrode and a second vertical alignment film. The electrode formation surface is positioned closer to the second substrate than a portion of the first vertical alignment film, which opposes the first electrode.
    Type: Application
    Filed: September 13, 2013
    Publication date: March 20, 2014
    Applicant: Japan Display Inc.
    Inventors: Emi HIGANO, Mitsutaka Okita, Daiichi Suzuki, Kenji Nakao, Kazuhiro Nishiyama
  • Patent number: 8674949
    Abstract: A liquid crystal display apparatus includes a display panel configured to have a plurality of scanning lines for which liquid crystal display elements each containing an optical input device and a display pixel are arranged, respectively, a backlight configured to be arranged facing the display panel to illuminate the display panel, and a control part configured to control writing into the display pixel and reading of a detection signal of the optical input device, wherein the control part displays an external light detection image substantially shielding light from the backlight on the display pixels throughout a first period of a frame period, and displays a display image on the display pixels throughout a second period of the frame period.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: March 18, 2014
    Assignee: Japan Displays Inc.
    Inventors: Kenji Nakao, Yasuyuki Tsuji, Mitsutaka Okita, Shigesumi Araki
  • Patent number: 8648898
    Abstract: According to one embodiment, stereoscopic liquid crystal shutter glasses include a left-eye liquid crystal shutter and a right-eye liquid crystal shutter. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a response time not more than 5 milliseconds. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a contrast ratio not less than 350:1. The contrast ratio is a value at an angle of sight of 30 degrees in left direction and in right direction.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: February 11, 2014
    Assignee: Japan Display Inc.
    Inventors: Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki, Toshiyuki Higano
  • Patent number: 8643811
    Abstract: According to one embodiment, a liquid crystal shutter component includes a first polarizer, a second polarizer, a liquid crystal layer, a first retardation layer, a second retardation layer, a third retardation layer and a fourth retardation layer. A liquid crystal orientation of the liquid crystal layer transitions between a plurality of bend orientation states. The retardation in the direction along the plane of the second retardation layer and the fourth retardation layer is 20 nm or more and 120 nm or less. The retardation along the first direction of the second retardation layer and the fourth retardation layer is 40 nm or more and 140 nm or less.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: February 4, 2014
    Assignee: Japan Display Inc.
    Inventors: Mitsutaka Okita, Kazuhiro Nishiyama
  • Patent number: 8570448
    Abstract: In one embodiment, a liquid crystal shutter includes a first liquid crystal panel for left eye and a second liquid crystal panel for right eye. Each liquid crystal panel includes a pair of electrode substrates and a liquid crystal layer held between the electrode substrates. A driving circuit switches the first and second liquid crystal panels between a transmissive state and a non-transmissive state by turns by applying a voltage to the first and second liquid crystal panels while inversing the polarity of the voltage applied between the pair of the electrode substrates at least once during a period in the transmissive state.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: October 29, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Mitsutaka Okita, Shigesumi Araki, Emi Higano
  • Patent number: 8432340
    Abstract: A liquid crystal display device includes a reflective display part and a transmissive display part in each of a plurality of matrix-arrayed pixels. The liquid crystal display device includes a liquid crystal display panel which is configured such that a liquid crystal layer is held between a pair of substrates and gradation display is performed in accordance with a pixel voltage which is applied to the liquid crystal layer of each pixel, a backlight which illuminates the liquid crystal display panel, a sensor unit which detects brightness of ambient light, and a voltage setting unit which sets the pixel voltage relative to each of input gradation levels, on the basis of the brightness that is detected by the sensor unit.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: April 30, 2013
    Assignee: Japan Display Central Inc.
    Inventors: Mitsutaka Okita, Kazuhiro Nishiyama, Shigesumi Araki, Emi Kisara
  • Publication number: 20120257125
    Abstract: According to one embodiment, a liquid crystal shutter component includes a first polarizer, a second polarizer, a liquid crystal layer, a first retardation layer, a second retardation layer, a third retardation layer and a fourth retardation layer. A liquid crystal orientation of the liquid crystal layer transitions between a plurality of bend orientation states. The retardation in the direction along the plane of the second retardation layer and the fourth retardation layer is 20 nm or more and 120 nm or less. The retardation along the first direction of the second retardation layer and the fourth retardation layer is 40 nm or more and 140 nm or less.
    Type: Application
    Filed: March 28, 2012
    Publication date: October 11, 2012
    Inventors: Mitsutaka Okita, Kazuhiro Nishiyama
  • Patent number: 8237901
    Abstract: A liquid crystal display device includes an OCB mode liquid crystal display panel, and an optical compensation element which is disposed outside of the liquid crystal display layer. The optical compensation element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal layer, and a second retardation plate which is disposed between the polarizer plate and the first retardation plate and has a biaxial refractive index anisotropy. The optical compensation element compensates a difference of a polarization state that differs between azimuth directions of light passing through the liquid crystal layer and compensates a shift of the polarization state of light, which passes through the retardation plate, from an azimuth direction of an absorption axis of the polarizer plate.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: August 7, 2012
    Assignee: Japan Display Central Inc.
    Inventors: Emi Kisara, Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki
  • Patent number: 8223299
    Abstract: The OCB mode liquid crystal display device applies a black display voltage V(Tr) with temperature characteristic requirements expressed by: V(T)=<Vs(T), and V(Tr??T)=V(T)=<Vs(Tr), where T represents a panel temperature of the liquid crystal panel, Tr represents a sensed temperature, ?T represents a temperature difference between the panel temperature and the sensed temperature, and Vs(T) represents an optimal black display voltage.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: July 17, 2012
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Shigesumi Araki, Kazuhiro Nishiyama, Mitsutaka Okita, Daiichi Suzuki
  • Patent number: 8189148
    Abstract: A transflective liquid crystal display device includes a liquid crystal display panel which is configured such that a liquid crystal layer is held between a pair of substrates, and to which an OCB mode is applied, and a pair of optical elements which are disposed on outsides of the liquid crystal layer, and optically compensate a retardation of the liquid crystal layer in a predetermined display state in which a voltage is applied to the liquid crystal layer, wherein the optical element is configured to include a circular polarization element including a polarizer and a first retardation plate which imparts a retardation of ¼ wavelength, and the first retardation plate has such wavelength dispersion characteristics as to establish a relationship, ?1<1, where ?1 is a ratio of an in-plane retardation Re430 at a wavelength of 430 nm to an in-plane retardation Re550 at a wavelength of 550 nm.
    Type: Grant
    Filed: May 15, 2008
    Date of Patent: May 29, 2012
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Emi Higano, Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki
  • Publication number: 20120038870
    Abstract: A liquid crystal display device includes an OCB mode liquid crystal display panel, and an optical compensation element which is disposed outside of the liquid crystal display layer. The optical compensation element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal layer, and a second retardation plate which is disposed between the polarizer plate and the first retardation plate and has a biaxial refractive index anisotropy. The optical compensation element compensates a difference of a polarization state that differs between azimuth directions of light passing through the liquid crystal layer and compensates a shift of the polarization state of light, which passes through the retardation plate, from an azimuth direction of an absorption axis of the polarizer plate.
    Type: Application
    Filed: October 27, 2011
    Publication date: February 16, 2012
    Inventors: Emi KISARA, Kazuhiro Nishiyama, Mitsutaka Okita, Shigesumi Araki
  • Publication number: 20110242651
    Abstract: According to one embodiment, stereoscopic liquid crystal shutter glasses include a left-eye liquid crystal shutter and a right-eye liquid crystal shutter. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a response time not more than 5 milliseconds. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a contrast ratio not less than 40:1. The contrast ratio is a value at an angle of sight of 35 degrees in all directions.
    Type: Application
    Filed: March 28, 2011
    Publication date: October 6, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Kazuhiro NISHIYAMA, Mitsutaka Okita, Shigesumi Araki, Toshiyuki Higano
  • Publication number: 20110242101
    Abstract: According to one embodiment, stereoscopic liquid crystal shutter glasses include a left-eye liquid crystal shutter and a right-eye liquid crystal shutter. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a response time not more than 5 milliseconds. Each of the left-eye liquid crystal shutter and the right-eye liquid crystal shutter has a contrast ratio not less than 350:1. The contrast ratio is a value at an angle of sight of 30 degrees in left direction and in right direction.
    Type: Application
    Filed: March 28, 2011
    Publication date: October 6, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Kazuhiro NISHIYAMA, Mitsutaka Okita, Shigesumi Araki, Toshiyuki Higano
  • Patent number: 8031306
    Abstract: A device includes a first substrate including a pixel electrode and an underlayer electrode a part of which is opposed to the pixel electrode, a second substrate including a counter-electrode which is opposed to the pixel electrode, and a layer which is held between the first and the second substrate, and which is in a first state prior to power-on and transitions to a second state, at a time of a display operation, wherein the pixel electrode includes a first part that passes light and a second part that reflects light, the second part includes a projection which is opposed to the counter-electrode, and a transverse electric field generating section, which is provided near the projection so as to generate a transverse electric field between the underlayer electrode and the second part, is disposed at an end portion of the second part, which is opposed to the underlying electrode.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: October 4, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Tetsuo Fukami, Mitsutaka Okita, Kenji Nakao
  • Publication number: 20110141382
    Abstract: In one embodiment, a liquid crystal shutter includes a first liquid crystal panel for left eye and a second liquid crystal panel for right eye. Each liquid crystal panel includes a pair of electrode substrates and a liquid crystal layer held between the electrode substrates. A driving circuit switches the first and second liquid crystal panels between a transmissive state and a non-transmissive state by turns by applying a voltage to the first and second liquid crystal panels while inversing the polarity of the voltage applied between the pair of the electrode substrates at least once during a period in the transmissive state.
    Type: Application
    Filed: December 10, 2010
    Publication date: June 16, 2011
    Applicant: Toshiba Mobile Display Co., Ltd.
    Inventors: Mitsutaka OKITA, Shigesumi Araki, Emi Higano
  • Patent number: 7889154
    Abstract: A liquid crystal display apparatus includes a display panel configured to be formed by arranging pixels like a matrix, a light source configured to light the display panel, and a driving control means for controlling the display panel, wherein the pixels are transreflective type liquid crystal pixels having a reflective part and a transmissive part driven independently, and the driving control means is configured to separately control non-image periods of the reflective part and transmissive part.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: February 15, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Shigesumi Araki, Kazuhiro Nishiyama, Mitsutaka Okita
  • Patent number: 7868977
    Abstract: Optical compensation elements include first phase plates and second phase plates, which have retardation in a front-plane direction. When a value ?n/?n? is set by normalizing a retardation amount ?n·d relating to light of each of wavelengths by a retardation amount ?n?·d relating to light of a predetermined wavelength ?, a normalized value ?n/?n? in the first phase plate is greater than a normalized value ?n/?n? in a liquid crystal layer, and a normalized value ?n/?n? in the second phase plate is less than the normalized value ?n/?n? in the liquid crystal layer, with respect to light of wavelengths other than the predetermined wavelength.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: January 11, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Kenji Nakao, Kazuhiro Nishiyama, Mitsutaka Okita, Daiichi Suzuki, Shigesumi Araki
  • Patent number: 7868979
    Abstract: A liquid crystal display device includes a liquid crystal display panel to which an OCB mode is applied, and an optical compensation element which optically compensates a retardation of the liquid crystal layer in a predetermined display state in which a voltage is applied to the liquid crystal layer. The optical compensation element includes a polarizer, a first retardation plate which is disposed between the polarizer and the liquid crystal display panel and in which discotic liquid crystal molecules are fixed in a state in which the discotic liquid crystal molecules are hybrid-aligned along a normal direction, and a second retardation plate which is disposed between the polarizer and the first retardation plate and has wavelength dispersion characteristics which are opposite to wavelength dispersion characteristics of an in-plane retardation in the liquid crystal layer.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: January 11, 2011
    Assignee: Toshiba Matsushita Display Technology Co., Ltd.
    Inventors: Mitsutaka Okita, Kazuhiro Nishiyama, Shigesumi Araki