Patents by Inventor Yoshinori Kiyota

Yoshinori Kiyota 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: 20020154078
    Abstract: In a liquid crystal display device that uses a liquid crystal material having spontaneous polarization and is actively driven by a TFT, a voltage corresponding to image data is applied twice by driving the TFT of each pixel electrode on a line by line basis of a liquid crystal panel, during writing in one frame. During erasure in one frame, voltage application to liquid crystal by batch selection of all the pixel electrodes is performed three times. With this three times of voltage application, it is possible to achieve a black display state in each pixel and make the stored charge amount at the liquid crystal in each pixel substantially zero.
    Type: Application
    Filed: September 5, 2001
    Publication date: October 24, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Toshiaki Yoshihara, Shinji Tadaki, Tetsuya Makino, Hironori Shiroto, Yoshinori Kiyota
  • Patent number: 6395352
    Abstract: When a photopolymerization compound (molecular weight: not less than 300) having at least two ultraviolet light sensitive portions in its molecular structure is mixed with ferroelectric liquid crystal and an exposure to ultraviolet light is performed, a continuous structure is formed over almost whole length between two glass substrates, and a continuous twisted structure is formed between the glass substrates in the state of liquid crystal molecular orientation. Before the exposure to ultraviolet light, the photopolymerization compound does not exhibit satisfactory compatibility with the ferroelectric liquid crystal to be mixed, but exhibits phase separation in the mixed state. The ferroelectric liquid crystal has a bookshelf layer structure.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: May 28, 2002
    Assignee: Fujitsu Limited
    Inventors: Akihiro Mochizuki, Toshiaki Yoshihara, Hironori Shiroto, Tetsuya Makino, Yoshinori Kiyota
  • Publication number: 20020008683
    Abstract: In a liquid crystal display device which is constructed by sealing a liquid crystal having spontaneous polarization in an active matrix panel including a coloring member and displays an image on a frame by frame basis by repeating a data writing process and a data erasing process for the active matrix panel, the frequency in the data writing process is set at least twice higher than a frame frequency and the data writing process and the data erasing process are completed within one frame time so that time taken for transmission of light through the coloring member is not more than a half of one frame time. The coloring member is in a non-light-transmitting state during a period of not shorter than a half of one frame, and the blurred outline section of a moving image is reduced.
    Type: Application
    Filed: January 30, 2001
    Publication date: January 24, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Tetsuya Makino, Toshiaki Yoshihara, Hironori Shiroto, Yoshinori Kiyota
  • Publication number: 20020000960
    Abstract: A liquid crystal display unit comprising a liquid crystal panel 21 having a plurality of liquid crystal pixels and a plurality of switching elements provided in response to the respective pixels; a back light 22 disposed at the back of the liquid crystal panel 21 and guides red, green, and blue light to the surface thereof; an image memory 30 for storing pixel data PD to be displayed on the respective pixels; an inverted data generating circuit 36 for generating inverted pixel data #PD of the respective pixel data PD; and a control signal generating circuit 31 and a data driver 32 wherein first scanning for writing the pixel data PD with respect to individual pixels of the liquid crystal panel 21 during each period in which red, green, and blue light are emitted in time-sharing manner, and second scanning for writing the inverted pixel data #PD with respect thereto are carried out in this order.
    Type: Application
    Filed: March 19, 1998
    Publication date: January 3, 2002
    Inventors: TOSHIAKI YOSHIHARA, AKIHIRO MOCHIZUKI, HIRONORI SHIROTO, TETSUYA MAKINO, YOSHINORI KIYOTA
  • Publication number: 20010052891
    Abstract: A liquid crystal display device including a liquid crystal panel having a plurality of liquid crystal pixels and a plurality of switching elements provided to correspond to the respective liquid crystal pixels; a back-light, disposed on the rear face of the liquid crystal panel, for emitting red, green and blue lights in a time-divided manner; and a data driver and a scan driver for switching the respective switching elements according to red, green and blue data of the respective pixels, in which the light emitting area of the back-light is divided into a plurality of light emitting areas and the intensity of light to be emitted from each of the divided light emitting areas is adjusted by a back-light control circuit and drive power source so as to compensate for differences in the light transmittance of the liquid crystal panel.
    Type: Application
    Filed: March 6, 2001
    Publication date: December 20, 2001
    Applicant: FUJITSU LIMITED
    Inventors: Toshiaki Yoshihara, Tetsuya Makino, Hironori Shiroto, Yoshinori Kiyota
  • Publication number: 20010035852
    Abstract: There is provided a liquid crystal display including a panel using a liquid crystal material having spontaneous polarization, such as ferroelectroic liquid crystal (FLC); having a faster response time suitable to display dynamic images. The FLC has the disadvantage caused by the incomplete memory effect at during driving for displaying “black” in several frames, where the light transmittance is preferably desired zero. The panel in the display are driven signals so that the driving signals are applied across the picture element, where the signals are positively or negatively offset to reference voltage of the panel.
    Type: Application
    Filed: April 2, 2001
    Publication date: November 1, 2001
    Applicant: FUJITSU LIMITED
    Inventors: Toshiaki Yoshihara, Tetsuya Makino, Hironori Shiroto, Yoshinori Kiyota
  • Patent number: 6203866
    Abstract: When a photopolymerization compound (molecular weight: not less than 300) having at least two ultraviolet light sensitive portions in its molecular structure is mixed with ferroelectric liquid crystal and an exposure to ultraviolet light is performed, a continuous structure is formed over almost whole length between two glass substrates, and a continuous twisted structure is formed between the glass substrates in the state of liquid crystal molecular orientation. Before the exposure to ultraviolet light, the photopolymerization compound does not exhibit satisfactory compatibility with the ferroelectric liquid crystal to be mixed, but exhibits phase separation in the mixed state. The ferroelectric liquid crystal has a bookshelf layer structure.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: March 20, 2001
    Assignee: Fujitsu Limited
    Inventors: Akihiro Mochizuki, Toshiaki Yoshihara, Hironori Shiroto, Tetsuya Makino, Yoshinori Kiyota
  • Patent number: 6115016
    Abstract: A display control method of a liquid crystal displaying apparatus for driving a liquid crystal panel comprising two substrates, and a liquid crystal layer therebetween. The driving means includes: pixel electrodes each corresponding to a pixel; and for time-division, emitting an LED (Light Emitting Diode) array for red, green, and blue as a back light within each display period, in synchronization with the on/off operation of the pixel electrodes. Each display period is divided into four. The LEDs in the LED array emit red, green, and blue lights in one of the divided periods. Then, one of the three colors is emitted again. This method solves the problem of the conventional control method for performing time-division color display in a liquid crystal displaying apparatus; namely, the insufficient emission intensity of LEDs makes the intensity of the entire liquid display apparatus insufficient, such that white is seen as somewhat grayish white to the human eye.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: September 5, 2000
    Assignee: Fujitsu Limited
    Inventors: Toshiaki Yoshihara, Akihiro Mochizuki, Hironori Shiroto, Tetsuya Makino, Yoshinori Kiyota