Patents by Inventor Hidehito Iisaka

Hidehito Iisaka 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: 20140267213
    Abstract: Vertical cross-talk is reduced. A correction circuit includes a correction amount calculation unit that calculates a correction amount on the basis of input image data Din and that generates correction amount data U; a correction coefficient generation unit that generates correction coefficient data C which represents a correction coefficient decided upon in accordance with a position in a horizontal scanning direction of a data line to which input image data Din to be corrected is supplied; and a correction unit that corrects the input image data Din on the basis of the correction amount data U and the correction coefficient data C and thereby generates correction image data Dh.
    Type: Application
    Filed: March 3, 2014
    Publication date: September 18, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Junichi Wakabayashi, Hidehito Iisaka, Hiroaki Ichimura
  • Patent number: 8816948
    Abstract: The video processing circuit includes a boundary detection unit that detects a specific boundary, which is a part of a boundary of a first pixel for which an applied voltage designated by the video signal is less than a first voltage, and a second pixel for which the applied voltage is more than a second voltage larger than the first voltage, the specific boundary being determined by tilt azimuth of the liquid crystal, and a replacement unit that replaces an applied voltage to a liquid crystal element corresponding to the first pixel with a predetermined voltage from the applied voltage designated by the input video signal when the applied voltage designated by the video signal is less than a third voltage smaller than the first voltage with respect to the first pixel adjacent to the specific boundary.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: August 26, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Hiroyuki Hosaka, Hidehito Iisaka
  • Publication number: 20140225936
    Abstract: A video processing circuit for specifying an applied voltage that is applied to a liquid crystal included in each pixel on the basis of a video signal, the video processing circuit includes a correction unit configured to, if the applied voltage specified by the video signal is a voltage of a level lower than a voltage level that is sufficient to an extent that can provide liquid crystal molecules with initial inclination angles, perform correction so that the applied voltage has a voltage level that is sufficient to an extent that can provide the liquid crystal molecules with initial inclination angles.
    Type: Application
    Filed: April 15, 2014
    Publication date: August 14, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiroyuki HOSAKA, Hidehito IISAKA
  • Publication number: 20140139811
    Abstract: A projector includes a power receiving terminal, a light source that emits light based on electric power supplied to the power receiving terminal, a light diffuser that adjusts the degree of diffusion of the light from the light source, a specifying section that alternately specifies one of illumination projection and image projection every time electric power supply to the power receiving terminal is started, and a light diffusion controller that controls the light diffuser so that when the specifying section specifies the illumination projection, the light diffuser diffuses the light from the light source, whereas when the specifying section specifies the image projection, the light diffuser transmits the light without substantially diffusing the light.
    Type: Application
    Filed: October 31, 2013
    Publication date: May 22, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiroaki SHINHA, Koichi MIYASAKA, Hirofumi KASUGA, Tadashi KINEBUCHI, Shuji NARIMATSU, Kaoru YAMAGUCHI, Hidehito IISAKA
  • Patent number: 8684541
    Abstract: A lighting apparatus used for a projection type display is provided, which can change the incident ray volume to an optical modulation device without changing the optical output intensity of the lamp, and can exhibit excellent effects in expressive power of an image and adaptability to the use environment. The lighting apparatus of the present invention comprises; a light source, two fly-eye lenses constituting a uniform lighting device, and a shading plate arranged between these fly-eye lenses and constituting a dimming device for adjusting the amount of light of the outgoing light from the light source. The angle of inclination of the shading plate is controlled based on an image signal supplied to the optical modulation device, thereby enabling adjustment of the amount of light.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: April 1, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Shoichi Uchiyama
  • Patent number: 8686978
    Abstract: A video processing includes: a boundary detecting section which respectively detects, in a current frame and a previous frame, a boundary between a first pixel in which the applied voltage designated by the video signal is lower than a first voltage and a second pixel in which the applied voltage is equal to or higher than a second voltage which is higher than the first voltage; and a correcting section which corrects the voltage applied to the liquid crystal element corresponding to at least one of the first pixel and the second pixel in positions between which a portion which moves from the boundary of the previous frame by one pixel is interposed, within the boundary of the current frame, to correct the input video signal in a direction where a transverse electric field generated in the first pixel and the second pixel is reduced.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: April 1, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Hiroyuki Hosaka
  • Patent number: 8638289
    Abstract: A driving method includes: dividing a unit period into a plurality of sub-frame periods corresponding to the primary colors; writing a primary color component in each sub-frame period by a first scan executed on the plurality of pixels; irradiating, in each sub-frame period, the plurality of pixels with the corresponding primary color of light by the irradiation unit at a timing that is after the first scan and before the first scan of a subsequent sub-frame period; and waiting a wait period that is from when the first scan of one primary color component among the at least three colors ends until when the irradiation unit starts irradiating the one primary color of light, the wait period for the one primary color being different from wait periods for the other colors.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: January 28, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Hiroyuki Hosaka, Taku Kitagawa, Shuichi Nakanishi, Atsushi Kato
  • Publication number: 20140022514
    Abstract: A projector including a first light source, a second light source that emits light having a color different from the first light source, a light modulator that modulates the light emitted from each of the first and the second light sources, and a controller that controls a first operation state in which the first and the second light sources are driven based on time division driving to perform image display and a second operation state in which the first and the second light sources are driven based on time division driving to perform illumination, wherein in the second operation state, a switching frequency at which the first and the second light sources are switched from one to the other is higher than a switching frequency at which the first and the second light sources are switched from one to the other in the first operation state.
    Type: Application
    Filed: July 18, 2013
    Publication date: January 23, 2014
    Inventors: Shuji NARIMATSU, Hidehito IISAKA
  • Publication number: 20140022515
    Abstract: A projector includes a light source; a spatial light modulation device which modulates light from the light source according to an image that is written; a light diffusion device which adjusts a degree of diffusion of the light incident on the spatial light modulation device or the light emitted from the spatial light modulation device; and a light diffusion controller which controls the light diffusion device so that the light diffusion device diffuses the light when the light source starts to light up.
    Type: Application
    Filed: July 22, 2013
    Publication date: January 23, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Kaoru YAMAGUCHI, Tadashi KINEBUCHI, Shuji NARIMATSU, Hiroyuki MOTEKI, Hirofumi KASUGA, Hidehito IISAKA
  • Publication number: 20130335650
    Abstract: A signal processing device, on the basis of signals that control voltages to be applied to pixels, a boundary between a first pixel corresponding to a first signal that applies a first voltage and a second pixel adjacent to the first pixel and corresponding to a second signal that applies a second voltage different from the first voltage at least by a predetermined threshold. The first signal is corrected to a third signal that applies a third voltage higher than the first voltage, and the second signal is corrected to a fourth signal that applies a fourth voltage higher than the second voltage. The second voltage is higher than the first voltage, the fourth voltage is higher than the third voltage, and a potential difference between the first voltage and the third voltage is larger than a potential difference between the second voltage and the fourth voltage.
    Type: Application
    Filed: June 13, 2013
    Publication date: December 19, 2013
    Inventors: Junichi WAKABAYASHI, Haruhiko NISHIMURA, Hidehito IISAKA
  • Publication number: 20130241914
    Abstract: A signal processing device which is used in a liquid crystal apparatus, includes a detection portion that detects a boundary between a first pixel to which a first voltage lower than a first reference voltage is applied and a second pixel to which a second voltage higher than a second reference voltage is applied on the basis of signals for controlling voltages applied to a plurality of pixels, and a correction portion that corrects the first voltage correlated with the first pixel to a third voltage which is higher than the first voltage and lower than the second voltage correlated with the second pixel.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 19, 2013
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Taku Kitagawa, Hiroyuki Hosaka, Hidehito Iisaka
  • Publication number: 20130241968
    Abstract: A signal processing device using a liquid crystal device having a plurality of pixels includes a storage unit that stores a signal which controls a level of transmittance in a plurality of pixels, a detection unit that, based on the signal that is stored in the storage unit, detects a first pixel associated with a second value which indicates higher transmittance than a first value, and a second pixel adjacent to the first pixel and associated with a fourth value which indicates the higher transmittance than a third value; and a correction unit that corrects the second value so that a difference of the transmittance indicated by the second value and the fourth value decreases. The third value indicates the higher transmittance than the first value, and the fourth value indicates a higher transmittance than the second value.
    Type: Application
    Filed: March 8, 2013
    Publication date: September 19, 2013
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Junichi Wakabayashi, Hiroyuki Hosaka, Taku Kitagawa, Hidehito Iisaka
  • Patent number: 8508455
    Abstract: Provided is a video processing circuit which designates an applied voltage, which is to be applied to a liquid crystal element of each pixel, based on a video signal, including: a first boundary detection portion which analyzes a video signal of a current frame and detects a boundary between a pixel, to which an applied voltage near a maximum grayscale is applied, and a pixel, to which an applied voltage near a minimum grayscale is applied, based on the video signal; a second boundary detection portion which analyzes a video signal of a frame preceding the current frame and detects a boundary between the pixel, to which the applied voltage near the maximum grayscale is applied, and the pixel, to which the applied voltage near the minimum grayscale is applied, based on the video signal; and a correction portion which corrects the applied voltage to a voltage which provides an initial tilt angle to a liquid crystal molecule in a case where the applied voltage designated with the video signal of a pixel adjacent
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: August 13, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Hiroyuki Hosaka
  • Patent number: 8497829
    Abstract: A video processing circuit, includes: a boundary detection section adapted to detect a boundary between a first pixel having an applied voltage, which is designated by the video signal input and is lower than a first voltage, and a second pixel having an applied voltage, which is designated by the video signal input and is one of equal to and higher than a second voltage higher than the first voltage, in a present frame and in a previous frame, which is one frame earlier than the present frame, respectively; and a correction section adapted to correct the video signal adapted to designate the applied voltages to the liquid crystal elements corresponding to the first pixel and the second pixel abutting on a moving section in the boundary of the present frame moving one pixel from the boundary in the previous frame so as to reduce a lateral electrical field caused by the first pixel and the second pixel.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: July 30, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Hiroyuki Hosaka, Hidehito Iisaka
  • Patent number: 8471874
    Abstract: An electro-optical device includes a display unit that has a plurality of pixel portions constituting a display area on a substrate and an image signal processing. The image signal processing circuit generates an image signal that sets a first subframe frame luminance of the pixel portion in a first subframe and sets a second subframe luminance of the pixel portion in a second subframe. The first subframe and the second subframe are obtained by partitioning a first frame of a first frame image signal. The first frame has a frame luminance. The first subframe luminance is higher than the frame luminance and the second subframe luminance is lower than the frame luminance.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: June 25, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Shigemi Sato, Hidehito Iisaka, Hiroyuki Hosaka, Takashi Toyooka
  • Patent number: 8466866
    Abstract: A video processing circuit used in a liquid crystal panel, includes: a first boundary detector that analyzes a video signal of a present frame to detect a boundary between a first pixel and a second pixel; a second boundary detector that analyzes a video signal of a frame one frame before the present frame to detect a boundary between the first pixel and the second pixel; a correction portion that corrects an applied voltage to a liquid crystal device corresponding to a second pixel which is adjacent to a portion of the boundary detected by the first boundary detector, which is changed from the boundary detected by the second boundary detector from the applied voltage specified by the video signal of the present frame to a voltage equal to or higher than the first voltage and lower than the second voltage.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: June 18, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Hiroyuki Hosaka
  • Patent number: 8411004
    Abstract: A video processing circuit for a liquid crystal panel, includes: a boundary detecting unit which detects a boundary between a first pixel whose applied voltage specified by an input video signal is below a first voltage and a second pixel whose applied voltage is equal to or higher than a second voltage which is higher than the first voltage; and a correction unit which corrects, for at least two second pixels one of which is adjacent to the boundary detected by the boundary detecting unit on the opposite side of the first pixel and which are successive in a direction opposite to the boundary, an applied voltage to liquid crystal elements corresponding to the second pixels from the applied voltage specified by the video signal to a voltage which is equal to or higher than the first voltage and below the second voltage.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: April 2, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Hiroyuki Hosaka
  • Patent number: 8179348
    Abstract: A display device includes a data converting section that converts display data that is to be supplied to pixel units. The data converting section converting on the basis of a predetermined conversion rule for each of a plurality of fields. The plurality of fields corresponds to respective light emission time periods of the plurality of light beams and following one after another in a successive manner on a time axis. The predetermined conversion rule converts data for a preceding field of one color to achieve a value in a successive field of a different color, such that the value approaches a desired value for at least one of brightness and color obtained when an image is displayed in the display area during the successive field.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: May 15, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Hiroyuki Hosaka
  • Patent number: 8154499
    Abstract: An electro-optical device includes a plurality of scanning lines, a plurality of data lines, a plurality of pixels, a scanning-line driving circuit, a block selecting circuit, a sampling circuit, and a control circuit. The scanning-line driving circuit selects the plurality of scanning lines in a predetermined order in each of a first and second field to which a frame is divided and applies a selection voltage. The block selecting circuit selects the blocks in either a right or left direction in a period during which the scanning line is selected. The sampling circuit samples a data signal corresponding to a gray scale level into each of the columns of data lines belonging to a block selected by the block selecting circuit. The control circuit controls the block selecting circuit to, select the blocks in one of the right direction and the left direction for each field.
    Type: Grant
    Filed: May 17, 2007
    Date of Patent: April 10, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Hidehito Iisaka, Hiroyuki Hosaka
  • Patent number: 8081284
    Abstract: A video processing circuit replaces an applied voltage designated by the video signal and applied to a first pixel with a predetermined third voltage, in the case that the applied voltage is lower than the third voltage, the first pixel is abutted on a predetermined application boundary, and the first pixel is surrounded by a risk boundary determined in accordance with a tilt azimuth direction of the liquid crystal on at least two sides.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: December 20, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Hiroyuki Hosaka, Hidehito Iisaka