Patents by Inventor Tetsuro Yamazaki

Tetsuro Yamazaki 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: 11297290
    Abstract: A projector is provided that includes a light source configured to radiate light, an electro-optical panel including a pixel circuit configured to receive light from the light source and emit the light, and an optical axis shifting element configured to shift an optical axis of the light emitted from the pixel circuit, with the projector being configured to display a pixel on a projection surface, based on the light emitted from the pixel circuit via the optical axis shifting element. When shifting a position of the pixel on the projection surface from a first position to a second position in a first direction, the optical axis shifting element shifts an optical axis of the light emitted from the pixel circuit using a path different from a shortest path from the first position to the second position.
    Type: Grant
    Filed: November 4, 2019
    Date of Patent: April 5, 2022
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Hiroyuki Hosaka, Tetsuro Yamazaki
  • Publication number: 20200145627
    Abstract: A projector is provided that includes a light source configured to radiate light, an electro-optical panel including a pixel circuit configured to receive light from the light source and emit the light, and an optical axis shifting element configured to shift an optical axis of the light emitted from the pixel circuit, with the projector being configured to display a pixel on a projection surface, based on the light emitted from the pixel circuit via the optical axis shifting element. When shifting a position of the pixel on the projection surface from a first position to a second position in a first direction, the optical axis shifting element shifts an optical axis of the light emitted from the pixel circuit using a path different from a shortest path from the first position to the second position.
    Type: Application
    Filed: November 4, 2019
    Publication date: May 7, 2020
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hiroyuki HOSAKA, Tetsuro YAMAZAKI
  • Patent number: 10593244
    Abstract: An electro-optical device includes an optical path shift element that changes a path of light by a first and second period including ? SFs; a determining unit that determines whether or not a difference between a first gradation displayed for the first period and a second gradation displayed for the second period is larger than a threshold value; and a designation signal generating unit that generates a designation signal designating an on or off-state of the pixel for the SFs, in a case where a result of the determination is negative, the designation signal designates the on or off-state of the pixel so that the pixel displays a display gradation for the first and second period based on at least one of the first and second gradation, and each of the first, second, and display gradation is a gradation expressible by the on or off-state for the 2? SFs.
    Type: Grant
    Filed: June 7, 2018
    Date of Patent: March 17, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Tetsuro Yamazaki
  • Publication number: 20180374406
    Abstract: An electro-optical device includes an optical path shift element that changes a path of light by a first and second period including ? SFs; a determining unit that determines whether or not a difference between a first gradation displayed for the first period and a second gradation displayed for the second period is larger than a threshold value; and a designation signal generating unit that generates a designation signal designating an on or off-state of the pixel for the SFs, in a case where a result of the determination is negative, the designation signal designates the on or off-state of the pixel so that the pixel displays a display gradation for the first and second period based on at least one of the first and second gradation, and each of the first, second, and display gradation is a gradation expressible by the on or off-state for the 2? SFs.
    Type: Application
    Filed: June 7, 2018
    Publication date: December 27, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Tetsuro YAMAZAKI
  • Patent number: 9389444
    Abstract: An electro-optical apparatus is provided with a pixel where first scanning line, first signal line, second scanning line, and second signal line are wired. The pixel includes a first transistor, a second transistor, a first pixel electrode, a second pixel electrode, and an electro-optical material, and the electro-optical material is interposed between the first pixel electrode and the second pixel electrode.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: July 12, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Tetsuro Yamazaki
  • Patent number: 9324255
    Abstract: An electro-optic device according an embodiment of the invention can increase the number of gray scales capable of being expressed. A liquid crystal panel is viewed via a blocking unit which blocks the field of view in a predetermined non-viewing period. A converting unit converts, based on a video signal, a gray-scale value input for each frame composed of a subfields into a subfield code indicating a combination of ON and OFF of b (2?b?a) subfields included in a viewing period other than the non-viewing period and c (1?c?b) subfields included in the non-viewing period. A driving unit drives a plurality of electro-optic elements each based on the converted subfield code.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: April 26, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Tetsuro Yamazaki, Takashi Toyooka
  • Publication number: 20160063930
    Abstract: The electro-optical device includes a first substrate, a second substrate, and an electro-optical material that is sandwiched between the first substrate and the second substrate. Pixel electrodes on the first substrate and pixel electrodes on the second substrate are arranged to coincide. The first substrate is driven by a first power supply, the second substrate is driven by a second power supply, and a potential of the first power supply and a potential of the second power supply are different from each other.
    Type: Application
    Filed: August 5, 2015
    Publication date: March 3, 2016
    Inventors: Tetsuro Yamazaki, Mitsutoshi Miyasaka
  • Publication number: 20150170588
    Abstract: An electro-optical apparatus is provided with a pixel where first scanning line, first signal line, second scanning line, and second signal line are wired. The pixel includes a first transistor, a second transistor, a first pixel electrode, a second pixel electrode, and an electro-optical material, and the electro-optical material is interposed between the first pixel electrode and the second pixel electrode.
    Type: Application
    Filed: December 9, 2014
    Publication date: June 18, 2015
    Inventor: Tetsuro YAMAZAKI
  • Patent number: 8872763
    Abstract: A position detecting system includes an indicating device including a photodiode that detects timing of a light pulse and a transmission unit that transmits a signal representing the timing, a plurality of light sources that emit light pulses to areas acquired by dividing a screen into a plurality of parts at timings unique to the light sources, a reception unit that receives the signal representing the timing, and a control unit that detects a position of the indicating device based on the signal representing the timing.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: October 28, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Takashi Toyooka, Tetsuro Yamazaki, Kazuhisa Mizusako
  • Patent number: 8773479
    Abstract: An electro-optic device has electro-optic elements; a storage units storing a first table including pairs of a gray-scale value and an a-bit sub-field code and a second table including pairs of a gray-scale value and a b-bit (b>a) sub-field code; a converting unit converting the gray-scale value of an object pixel into the sub-field code using the second table when a difference in gray-scale value between a first image and a second image is less than a threshold value, while converting the gray-scale value of the object pixel into the sub-field code using the first table when the difference in gray-scale value between the first image and the second image is the threshold value or more; and a driving unit supplying a signal corresponding to the sub-field code converted by the converting unit to drive the electro-optic elements.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: July 8, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Takashi Nishimori, Tetsuro Yamazaki, Takashi Toyooka
  • Patent number: 8669395
    Abstract: Provided is a new crystal A of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which is far better in stability, and a process for producing the crystal and a process for producing the crystal A comprising a step of heating the following crystal B in water having a pH of 3 to 9: crystal A: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 8.7 to 9.4°, within that of 2? of 12.2 to 12.8°, and within that of 2? of 24.8 to 25.4° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength; and crystal B: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 20.8 to 21.4°, within that of 2? of 26.7 to 27.3°, and within that of 2? of 29.7 to 30.3° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: March 11, 2014
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Takashi Miki, Masahiro Takeda, Tetsuro Yamazaki
  • Publication number: 20130093864
    Abstract: An electro-optic device according an embodiment of the invention can increase the number of gray scales capable of being expressed. A liquid crystal panel is viewed via a blocking unit which blocks the field of view in a predetermined non-viewing period. A converting unit converts, based on a video signal, a gray-scale value input for each frame composed of a subfields into a subfield code indicating a combination of ON and OFF of b (2?b?a) subfields included in a viewing period other than the non-viewing period and c (1?c?b) subfields included in the non-viewing period. A driving unit drives a plurality of electro-optic elements each based on the converted subfield code.
    Type: Application
    Filed: September 7, 2012
    Publication date: April 18, 2013
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Tetsuro YAMAZAKI, Takashi TOYOOKA
  • Publication number: 20130069993
    Abstract: An electro-optic device has electro-optic elements; a storage units storing a first table including pairs of a gray-scale value and an a-bit sub-field code and a second table including pairs of a gray-scale value and a b-bit (b>a) sub-field code; a converting unit converting the gray-scale value of an object pixel into the sub-field code using the second table when a difference in gray-scale value between a first image and a second image is less than a threshold value, while converting the gray-scale value of the object pixel into the sub-field code using the first table when the difference in gray-scale value between the first image and the second image is the threshold value or more; and a driving unit supplying a signal corresponding to the sub-field code converted by the converting unit to drive the electro-optic elements.
    Type: Application
    Filed: August 27, 2012
    Publication date: March 21, 2013
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takashi NISHIMORI, Tetsuro YAMAZAKI, Takashi TOYOOKA
  • Patent number: 8384775
    Abstract: A scanning-type image display device includes: a light source section; a horizontal scanner; a vertical scanner; and a vertical scanner control section that controls the vertical scanner in such a manner that, when a second video signal is input, the vertical scanner control section controls the vertical scanner so as to perform vertical scanning with a scanning speed of vertical scanning which is higher than that of vertical scanning in the case of a first video signal being input, and after temporarily retuning a drawing position to an initial position within a time range from a point of time at which horizontal scanning of a current frame is completed to a start time of a next frame, the vertical scanner control section restarts the vertical scanning from the initial position in synchronization with a start timing of the next frame.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: February 26, 2013
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuro Yamazaki
  • Publication number: 20120182214
    Abstract: A position detecting system includes an indicating device including a photodiode that detects timing of a light pulse and a transmission unit that transmits a signal representing the timing, a plurality of light sources that emit light pulses to areas acquired by dividing a screen into a plurality of parts at timings unique to the light sources, a reception unit that receives the signal representing the timing, and a control unit that detects a position of the indicating device based on the signal representing the timing.
    Type: Application
    Filed: January 16, 2012
    Publication date: July 19, 2012
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Takashi Toyooka, Tetsuro Yamazaki, Kazuhisa Mizusako
  • Patent number: 8040332
    Abstract: A light scan device which forces a beam light depending on an image signal to scan, including: a light source part for supplying the beam light; and a scanning part for forcing the beam light from the light source part to scan an illumination-target region in a first direction and a second direction substantially orthogonal to the first direction, wherein the scanning part is driven so that a frequency with which the beam light is forced to scan in the first direction is higher than a frequency with which the beam light is forced to scan in the second direction, and a spot formed on the illumination-target region by the beam light has a form with a shorter size in the first direction than in the second direction.
    Type: Grant
    Filed: August 9, 2006
    Date of Patent: October 18, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Tetsuro Yamazaki, Takashi Takeda, Daisuke Uchikawa, Yasunaga Miyazawa
  • Patent number: 7990598
    Abstract: A scan-type image display device which displays an image by scan of laser beam emitted from a light source in one direction and another direction of a light receiving surface includes: a first scan unit which performs scan of the laser beam in the one direction by deflecting the laser beam; a second scan unit which performs scan of the laser beam in the another direction by deflecting the laser beam; and a scan control unit which equalizes the scan width of the laser beam scan in the one direction by using the first scan unit performed at each position in the another direction within the light receiving surface.
    Type: Grant
    Filed: June 23, 2008
    Date of Patent: August 2, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuro Yamazaki
  • Publication number: 20110152572
    Abstract: Provided is a new crystal A of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which is far better in stability, and a process for producing the crystal and a process for producing the crystal A comprising a step of heating the following crystal B in water having a pH of 3 to 9: crystal A: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 8.7 to 9.4°, within that of 2? of 12.2 to 12.8°, and within that of 2? of 24.8 to 25.4° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength; and crystal B: a crystal of optically active 4-amino-3-(4-chlorophenyl)butanoic acid which has diffraction peaks within the range of a diffraction angle 2? of 20.8 to 21.4°, within that of 2? of 26.7 to 27.3°, and within that of 2? of 29.7 to 30.3° in a powder X-ray diffraction measurement of the crystal by use of the Cu—K? wavelength.
    Type: Application
    Filed: December 13, 2010
    Publication date: June 23, 2011
    Inventors: Takashi Miki, Masahiro Takeda, Tetsuro Yamazaki
  • Patent number: 7914150
    Abstract: To reduce the color break-up and to provide high quality projection images. A method of driving a spatial light modulator, including generating a sub-frame pulse signal for a first colored light R1 through R8, B1 through B8, generating a sub-frame pulse signal for a second colored light G1 through G8, arranging the sub-frame pulse signals for the respective colored light so that at least three of the sub-frame pulse signals for the first colored light R1 through R8, B1 through B8 adjoin either one of the sub-frame pulse signals for the second colored light G1 through G8 during at least one frame of the image, and driving a plurality of movable mirror elements in accordance with the sub-frame pulse signals for the respective colored light arranged in arranging the sub-frame pulse signals, the movable mirror elements being alternatively moved at least to a first reflecting position and a second reflecting position.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: March 29, 2011
    Assignee: Seiko Epson Corporation
    Inventors: Tetsuro Yamazaki, Hidehito Iisaka
  • Patent number: 7692836
    Abstract: A scanning-type image display device includes: a light source section; a horizontal scanner; a vertical scanner, and a vertical scanner control section in such manner that, when a discrepancy occurs between a target scan line number and a scannable line number, and when a difference obtained by subtracting of the target scan line number from the scannable line number is a positive value, the vertical scanner control section controls the vertical scanner so as to put vertical scanning on standby within a time range from a point of time at which horizontal scanning is completed in a first frame to a point of time at which a horizontal scanning start signal corresponding to a vertical synchronizing signal of the video signal in a second frame is input, and restarts the vertical scanning in synchronization with an input timing of the horizontal scanning start signal.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: April 6, 2010
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuro Yamazaki