Patents by Inventor Tomoyuki Ishihara

Tomoyuki 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: 20210390925
    Abstract: According to an aspect, a display device includes: a display panel that has a display area in which a plurality of pixels are arranged; a light source configured to illuminate the display area; a first control circuit configured to receive first signals corresponding to a first partial image to be displayed in a portion of the display area; and a second control circuit configured to receive second signals corresponding to a second partial image to be displayed in another portion of the display area. The light source has a plurality of light-emitting areas in each of which a light emission intensity is individually controllable. The first control circuit is configured to transmit lighting quantity information indicating the light emission intensity of each of the light-emitting areas to the second control circuit.
    Type: Application
    Filed: June 9, 2021
    Publication date: December 16, 2021
    Inventors: Tomoyuki ISHIHARA, Kazuhiko SAKO
  • Publication number: 20210390919
    Abstract: A liquid crystal display device includes: a liquid crystal panel having pixels with a first electrode and a second electrode; a control circuit; and a counter. The number and an arrangement of pixels where a potential of the second electrode is higher than that of the first electrode in a first mode equal the number and an arrangement of pixels where the potential of the first electrode is higher than that of the second electrode in a second mode. The counter increases a count while the panel operates in the first mode, and decreases the count while the panel operates in the second mode. The control circuit operates the panel in the first mode when the count at a determination timing is not greater than a first threshold, and operates the panel in the second mode when the count at the determination timing is not less than a second threshold.
    Type: Application
    Filed: June 9, 2021
    Publication date: December 16, 2021
    Inventors: Tomoyuki ISHIHARA, Kazuhiko SAKO
  • Publication number: 20210082774
    Abstract: A method of evaluating metal contamination by measuring the amount of metal contaminants to a silicon wafer in a rapid thermal processing apparatus includes steps of obtaining a Si single crystal grown by the Czochralski method at a pulling rate of 1.0 mm/min or lower, the crystal having oxygen concentration of 1.3×1018 atoms/cm3 or less, slicing silicon wafers from the Si single crystal except regions of 40 mm toward the central portion from the head of the single crystal and 40 mm toward the central portion from the tail, heat-treating the silicon wafer with a rapid thermal processing apparatus and transferring contaminants from members in a furnace of the rapid thermal processing apparatus to the silicon wafer, and measuring a lifetime of the silicon wafer to which contaminants are transferred.
    Type: Application
    Filed: August 2, 2018
    Publication date: March 18, 2021
    Applicant: GLOBALWAFERS JAPAN CO., LTD.
    Inventors: Nobue ARAKI, Takeshi ONOZUKA, Tomoyuki ISHIHARA
  • Patent number: 10706792
    Abstract: A light source section 21 includes a red light source 22r, a green light source 22g, and a blue light source 22b, and one frame period is divided into four subfield periods. Light sources of each color respectively emit light in blue, green, and red subfield periods, and the red light source 22r and the green light source 22g emit light in a yellow subfield period. Light emission intensity of the blue light source 22b in the blue subfield period is set to twice light emission intensities of the red light source 22r and the green light source 22g in other subfield periods. Color breakup is reduced by displaying the yellow subfield, and light utilization efficiency improved by setting transmittance of a light modulation element 16 to 100% when a white signal by which each gradation of red, green, and blue becomes maximum is input. With this, a field sequential type display device which can reduce color breakup and has high light utilization efficiency is provided.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: July 7, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki Ishihara, Masamitsu Kobayashi
  • Patent number: 10386676
    Abstract: A field-sequential color image display device is provided which can sufficiently reduce power consumption while suppressing color breakup. In a liquid crystal display device that displays a color image under a field sequential system in which each frame period includes four field periods corresponding to three primary colors, namely red, green, and blue, and a white color, the emission intensity of a light source section (120) during the white field period is determined in advance so that the white color is displayed at a target maximum luminance when the transmittance of a pixel array section (110) is at its maximum during all of the four field periods. A drive control section (200) separates an input image signal into white, blue, green, and red components, expands the white component, and then assigns the components to the four field periods.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: August 20, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Tomoyuki Ishihara
  • Publication number: 20190251919
    Abstract: A light source section 21 includes a red light source 22r, a green light source 22g, and a blue light source 22b, and one frame period is divided into four subfield periods. Light sources of each color respectively emit light in blue, green, and red subfield periods, and the red light source 22r and the green light source 22g emit light in a yellow subfield period. Light emission intensity of the blue light source 22b in the blue subfield period is set to twice light emission intensities of the red light source 22r and the green light source 22g in other subfield periods. Color breakup is reduced by displaying the yellow subfield, and light utilization efficiency improved by setting transmittance of a light modulation element 16 to 100% when a white signal by which each gradation of red, green, and blue becomes maximum is input. With this, a field sequential type display device which can reduce color breakup and has high light utilization efficiency is provided.
    Type: Application
    Filed: September 7, 2017
    Publication date: August 15, 2019
    Inventors: TOMOYUKI ISHIHARA, MASAMITSU KOBAYASHI
  • Patent number: 10297229
    Abstract: A display device includes a display unit having a function of showing a space behind a display screen transparently and a control unit for controlling the display unit based on an input video signal. The control unit controls the display unit to display a transparent video having a transparent portion through which the space behind the display screen can be seen transparently, while displaying a main video based on the input video signal. The control unit may generate an instruction signal indicating a display period of the transparent video and may control the display unit in accordance with the generated instruction signal, or may control the display unit in accordance with an instruction signal provided externally. With this, there is provided a see-through type display device which does not hinder a vision when displaying a video for a long time.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: May 21, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Tomoyuki Ishihara
  • Publication number: 20190108798
    Abstract: The present invention provides a field-sequential color image display device suppressing color breakup and an increase in power consumption. The liquid crystal display device displays a color image by a field-sequential system in which each frame period includes four field periods corresponding to four colors, white, blue, green, and red, and the liquid crystal display device includes a light source portion which includes blue, green, and red LEDs, and a light source driver circuit. The light source driver circuit generates blue, green, and red light source control signals CswB, CswG, and CswR, and drives the light source portion on the basis of these signals.
    Type: Application
    Filed: March 16, 2017
    Publication date: April 11, 2019
    Inventor: TOMOYUKI ISHIHARA
  • Publication number: 20180197488
    Abstract: A display device that can display an image and make a background visible even when the image represented by a display gradation value and a transparency gradation value included in an image information signal is not within a displayable range is provided. Even when the image specified by the display gradation value and the transparency gradation value included in the image information signal is not within the displayable range, the display gradation value and the transparency gradation value can be adjusted by prioritizing the transparency gradation value or prioritizing the display gradation value. In this way, the display device can display the image, make the background transparent, and display the image and the background overlapping each other regardless of whether the image specified by the display gradation value and the transparency gradation value is within the displayable range.
    Type: Application
    Filed: June 24, 2016
    Publication date: July 12, 2018
    Inventors: TOMOYUKI ISHIHARA, KENTA FUKUOKA
  • Patent number: 9997122
    Abstract: Provided is an image display device equipped with a see-through display function allowing the background to be seen through. In a liquid crystal display device (100), a transparent plate (170) is attached such that the incidence angle of source light emitted by a backlight source (160) is Brewster's angle ?b, and therefore, the transparent plate (170) reflects S-wave included in the source light, and allows P-wave included in ambient light incident from the back side to be transmitted therethrough and illuminate a liquid crystal panel (150). Thus, when the backlight source (160) is on, the viewer can see an image displayed on the background, whereas when the backlight source (160) is off, only the background can be seen.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: June 12, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kenta Fukuoka, Tomoyuki Ishihara
  • Publication number: 20170365233
    Abstract: A display device includes a display unit having a function of showing a space behind a display screen transparently and a control unit for controlling the display unit based on an input video signal. The control unit controls the display unit to display a transparent video having a transparent portion through which the space behind the display screen can be seen transparently, while displaying a main video based on the input video signal. The control unit may generate an instruction signal indicating a display period of the transparent video and may control the display unit in accordance with the generated instruction signal, or may control the display unit in accordance with an instruction signal provided externally. With this, there is provided a see-through type display device which does not hinder a vision when displaying a video for a long time.
    Type: Application
    Filed: October 20, 2015
    Publication date: December 21, 2017
    Applicant: Sharp Kabushiki Kaisha
    Inventor: TOMOYUKI ISHIHARA
  • Publication number: 20170351144
    Abstract: A field-sequential color image display device is provided which can sufficiently reduce power consumption while suppressing color breakup. In a liquid crystal display device that displays a color image under a field sequential system in which each frame period includes four field periods corresponding to three primary colors, namely red, green, and blue, and a white color, the emission intensity of a light source section (120) during the white field period is determined in advance so that the white color is displayed at a target maximum luminance when the transmittance of a pixel array section (110) is at its maximum during all of the four field periods. A drive control section (200) separates an input image signal into white, blue, green, and red components, expands the white component, and then assigns the components to the four field periods.
    Type: Application
    Filed: November 5, 2015
    Publication date: December 7, 2017
    Applicant: Sharp Kabushiki Kaisha
    Inventor: TOMOYUKI ISHIHARA
  • Patent number: 9726948
    Abstract: There is provided an image display device that includes a display in which a background is transparently seen from a front surface side, and has a high degree of freedom at the time of installation. A liquid crystal panel (32) for adjusting transparency/light-emission adjusts, for each pixel, a ratio between transmitted light-source light and ambient light by respectively controlling a polarization direction of a reflected polarization component of the light-source light irradiated to a reflection-type polarization plate (20) from a light guide plate (180) and a polarization direction of a transmitted polarization component of the ambient light incident to the reflection-type polarization plate (20) from a rear surface side of the display, based on transparent/light-emitting pixel information.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: August 8, 2017
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kenta Fukuoka, Tomoyuki Ishihara, Yasunori Ake
  • Publication number: 20170069281
    Abstract: Provided is an image display device equipped with a see-through display function allowing the background to be seen through. In a liquid crystal display device (100), a transparent plate (170) is attached such that the incidence angle of source light emitted by a backlight source (160) is Brewster's angle ?b, and therefore, the transparent plate (170) reflects S-wave included in the source light, and allows P-wave included in ambient light incident from the back side to be transmitted therethrough and illuminate a liquid crystal panel (150). Thus, when the backlight source (160) is on, the viewer can see an image displayed on the background, whereas when the backlight source (160) is off, only the background can be seen.
    Type: Application
    Filed: August 19, 2014
    Publication date: March 9, 2017
    Inventors: Kenta FUKUOKA, Tomoyuki ISHIHARA
  • Publication number: 20170004783
    Abstract: In an image display device that divides one frame into a plurality of fields and performs drive operation, a light-source lighting period with a sufficient length is ensured. In a field-sequential image display device, as modes during writing of data into pixel portions, a normal writing mode for writing data into one row at a time and a high-speed writing mode for writing data having the same value into a plurality of rows at a time for each column are prepared. In a blue field (F(B)), data writing processing in the high-speed writing mode is performed. In a green field (F(G)) and a red field (F(R)), data writing processing in the normal writing mode is performed.
    Type: Application
    Filed: September 29, 2014
    Publication date: January 5, 2017
    Inventor: Tomoyuki Ishihara
  • Publication number: 20160154269
    Abstract: There is provided an image display device that includes a display in which a background is transparently seen from a front surface side, and has a high degree of freedom at the time of installation. A liquid crystal panel (32) for adjusting transparency/light-emission adjusts, for each pixel, a ratio between transmitted light-source light and ambient light by respectively controlling a polarization direction of a reflected polarization component of the light-source light irradiated to a reflection-type polarization plate (20) from a light guide plate (180) and a polarization direction of a transmitted polarization component of the ambient light incident to the reflection-type polarization plate (20) from a rear surface side of the display, based on transparent/light-emitting pixel information.
    Type: Application
    Filed: August 5, 2014
    Publication date: June 2, 2016
    Inventors: Kenta FUKUOKA, Tomoyuki ISHIHARA, Yasunori AKE
  • Publication number: 20150371580
    Abstract: A display apparatus, and a driving method of driving the display apparatus control color breakup and prevent flicker. A backlight periodically emits a light beam by lighting one type of light source in a subframe period and a light beam by lighting all types of light sources in a subsequent subframe period. A lighting period for a cycle of emission of the same type of color light beams is shorter than a period for a cycle of receiving the video signal.
    Type: Application
    Filed: October 7, 2013
    Publication date: December 24, 2015
    Inventors: Masafumi YASHIKI, Tomoyuki ISHIHARA, Masamitsu KOBAYASHI
  • Patent number: 9177514
    Abstract: An image display apparatus operates in field sequence mode which effectively reduces the generation of color break. A color break strength calculating unit determines a color break strength that indicates the noticeability of the generation of the color break. A light-source signal generating unit controls each light source so that as the color break strength of a color mixed component having the highest color break strength is higher, the color mixed component is contained more in light output from a light-source unit during the extension subframe period. If there is present a first pixel region as an area including one or more pixel formation regions where an image containing the component of interest is displayed, the color break strength of the component of interest increases more as a magnitude of the component of interest is larger in the first pixel region.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: November 3, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Tomoyuki Ishihara
  • Patent number: 9135869
    Abstract: In a display signal generator for use in a display device, in order to display the image corresponding to the input image signals, a combination of desired display time aperture ratios are obtained for each pixel in N number of sub-frame phases, a combination of display time aperture ratios in the N number of sub-frame phases at the time the display color is actually reproduced is set from the combination of the desired time aperture ratios on the basis of response characteristics of a pixel array unit, and a modulation signal which implements the combination of display time aperture ratios that were set is output.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: September 15, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Tomoyuki Ishihara, Masaaki Moriya
  • Patent number: 9111501
    Abstract: The present invention aims to provide a display device capable of displaying an image in a color maintaining a hue and a tone expected from an input signal. In a field-sequential liquid crystal display device, when a red image is displayed, red light is transmitted in the first subframe period, and further, green light and blue light are transmitted in the second and third subframe periods, respectively. Therefore, the blue component of an input signal is adjusted such that the transmittance of the liquid crystal panel is at a predetermined value even in the third subframe period. As a result, the hue of an image displayed on the liquid crystal panel is the same as or almost the same as the hue of red expected from the input signal. Moreover, the color of red displayed on the liquid crystal panel maintains the tone value of the color expected from the input signal.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: August 18, 2015
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masamitsu Kobayashi, Tomoyuki Ishihara