Patents by Inventor Kazuyoshi Fujioka
Kazuyoshi Fujioka 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).
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Patent number: 9128557Abstract: A first electrode (62c) is provided on a first substrate (2) having a display surface of a display panel, and connected to a common electrode (com). A field effect transistor (62b) is provided on a second substrate (1) in such a manner that the first electrode (62c) is provided in a back channel side of the field effect transistor (62b) so as to be separated from the field effect transistor (62b). The field effect transistor (62b) has a gate terminal and a first drain/source terminal each of which is connected to a first wiring (Vrstn) to which a voltage for reset is to be applied. A switch (62a) has a terminal connected to a second drain/source terminal (62bs), and the other terminal connected to a second wiring (Vom) from which an output of the field effect transistor (62b) is provided.Type: GrantFiled: April 27, 2010Date of Patent: September 8, 2015Assignee: Sharp Kabushiki KaishaInventor: Kazuyoshi Fujioka
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Patent number: 8698986Abstract: The present invention provides a liquid crystal display device capable of suppressing alignment disorder of liquid crystal and having satisfactory VR characteristics. According to the present invention, a liquid crystal display device includes a pair of substrates and a liquid crystal layer interposed between the pair of substrates, the liquid crystal display device having a reflective region and a transmissive region. One of the pair of substrates includes a longitudinal projecting portion and a liquid-crystal-layer-thickness adjusting portion for setting a liquid crystal layer thickness in the reflective region to be smaller than a liquid crystal layer thickness in the transmissive region. At least a part of the projecting portion is arranged without a gap along at least a part of a step portion of the liquid-crystal-layer-thickness adjusting portion.Type: GrantFiled: October 27, 2009Date of Patent: April 15, 2014Assignee: Sharp Kabushiki KaishaInventors: Katsuya Ogawa, Kazuyoshi Fujioka, Tomoo Furukawa, Masaaki Saitoh
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Patent number: 8654267Abstract: Provided is a display device provided with a non-contact type touch sensor having excellent properties, in place of a contact-point type touch sensor. The display device includes a first circuit having a first electrode (62c) formed on a first substrate (2) having a display surface of a display panel, a field effect transistor formed on a second substrate (1) opposed to the first substrate (2) so that the first electrode (62c) is spaced from the field effect transistor on the back channel side, a gate terminal of the field effect transistor being connected to a first wiring (Vrstn) and a first drain/source terminal thereof being connected to a second wiring (Vsm), and a switch, one end of which is connected to a second drain/source terminal of the field effect transistor and the other end being connected to a third wiring (Vom).Type: GrantFiled: March 11, 2010Date of Patent: February 18, 2014Assignee: Sharp Kabushiki KaishaInventors: Kazuyoshi Fujioka, Atsuhito Murai
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Patent number: 8614777Abstract: The present invention provides a semi-transmissive liquid crystal display device that presents excellent display quality in the reflective display, and that can be easily applied to high definition. The liquid crystal display device of the present invention includes a first substrate, a liquid crystal layer, and a second substrate, in this order. The first substrate has pixel electrodes having a structure composed of a trunk portion and a plurality of branch portions that branch off from the trunk portion. The liquid crystal display device has a display region that includes a region where the branch portions and slits are alternately disposed. The display region has a reflective region and a transmissive region. The reflective region has a pixel electrode, a reflective film disposed under the pixel electrode, and a ?/4 retarder plate.Type: GrantFiled: May 18, 2009Date of Patent: December 24, 2013Assignee: Sharp Kabushiki KaishaInventors: Tomoo Furukawa, Katsuya Ogawa, Masaaki Saitoh, Kazuyoshi Fujioka
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Patent number: 8605020Abstract: A liquid crystal display device of at least one embodiment of the present invention includes a TN-mode liquid crystal display panel which is constituted by pixels of three colors (red, green, and blue) and a color filter. A thickness of a liquid crystal layer (cell thickness) is determined on a basis of a retardation value of green light or red light, which has a larger wavelength than blue having shortest wavelength among the three colors. A display data switching circuit carries out gradation conversion of shifting input gradation values to lower gradation values with respect to image data supplied to pixels of blue. Thus, grayscale inversion is prevented. The liquid crystal display device of the present invention produces an effect of improving transmittance of pixels of colors having wavelengths other than the wavelength of blue.Type: GrantFiled: August 27, 2009Date of Patent: December 10, 2013Assignee: Sharp Kabushiki KaishaInventors: Masaaki Saitoh, Tomoo Furukawa, Kazuyoshi Fujioka
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Patent number: 8587502Abstract: In one embodiment of the present application, a liquid crystal panel drive device includes a signal processing section for determining an output gray scale in accordance with a gray scale transition from the gray scale which is forecasted to reach by a previous response to an input gray scale and can carry out overdrive with the output gray scale. At a temperature at which a rise gray scale transition may occur in absence of a response condition does not exist for single overdrive, the signal processing section determines, as an output gray scale, a gray scale lower than a maximum gray scale with respect to a particular gray scale transition out of a rise type gray scale transition. In such a way, a display quality (especially a moving image display quality) at a low temperature can be improved.Type: GrantFiled: May 21, 2007Date of Patent: November 19, 2013Assignee: Sharp Kabushiki KaishaInventors: Koki Hongo, Tomoo Furukawa, Kazuyoshi Fujioka
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Publication number: 20130027525Abstract: The liquid crystal display device (100) according to the present invention performs display in a stereoscopic display mode. In each of the plurality of pixels in the liquid crystal display device (100), left-eye image data and right-eye image data are alternately written every two successive vertical scanning periods. Each of the plurality of pixels exhibits the same polarity over the two vertical scanning periods in which left-eye image data is written, and exhibits the same polarity over the two vertical scanning periods in which the right-eye image data is written. Accordingly, the liquid crystal display device (100) performs stereoscopic display with suppressed display unevenness.Type: ApplicationFiled: April 7, 2011Publication date: January 31, 2013Applicant: SHARP KABUSHIKI KAISHAInventors: Masae Kitayama, Fumikazu Shimoshikiryoh, Atsushi Ban, Nobuyoshi Nagashima, Kazuyoshi Fujioka, Shinji Shinjo, Takayuki Nagaoka, Kenichi Hyohdoh
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Patent number: 8319921Abstract: The present invention provides a transflective liquid crystal display device having a high aperture ratio. The present invention is a liquid crystal display device, comprising: a first substrate; a liquid crystal layer; and a second substrate in this order, wherein the first substrate includes a pixel electrode having a trunk portion, a plurality of branch portions branched from the trunk portion, and slits, the liquid crystal display device comprises a display region including a region where the branch portions and the slits are alternately arranged, the display region includes a reflection region and a transmission region, and in the reflection region, the pixel electrode, a reflective film disposed under the pixel electrode, and a ?/4 retarder are arranged.Type: GrantFiled: February 19, 2009Date of Patent: November 27, 2012Assignee: Sharp Kabushiki KaishaInventors: Masaaki Saitoh, Kazuyoshi Fujioka, Katsuya Ogawa
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Patent number: 8305533Abstract: The present invention provides an MVA transmissive or transflective liquid crystal display device with display qualities enhanced along with improvement in contrast. A liquid crystal display device of the present invention including: a pair of substrates; and a liquid crystal layer disposed between the pair of substrates, wherein one of the pair of substrates includes a pixel electrode having a rectangular shape when viewed from a display face side, the other substrate includes a linear-shaped dielectric protrusion overlapping with a corner portion of the pixel electrode when viewed from the display face side, and at least one of the pair of substrates includes a corner light-shielding member overlapping with a region where the linear-shaped dielectric protrusion and the corner portion of the pixel electrode overlap with each other.Type: GrantFiled: October 21, 2008Date of Patent: November 6, 2012Assignee: Sharp Kabushiki KaishaInventors: Koki Hongo, Kazuyoshi Fujioka, Katsuya Ogawa, Tomoo Furukawa, Masaaki Saitoh
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Patent number: 8264438Abstract: A liquid crystal display device has a vertical alignment type liquid crystal panel. The vertical alignment type liquid crystal panel is provided with an active matrix substrate whereupon a light reflection pixel electrode for reflecting light and a light transmission pixel electrode for transmitting light are provided in each pixel section; a counter electrode substrate; and a liquid crystal layer made of a liquid crystal material having negative dielectric anisotropy. The counter electrode substrate includes a convex section so that the liquid crystal layer in the light reflection section has the thickness thinner than that in the liquid crystal layer of the light transmission section. A liquid crystal panel driving device carries out gray scale transition enhancement processing in which the input gray scale is corrected in accordance with gray scale transition.Type: GrantFiled: July 24, 2007Date of Patent: September 11, 2012Assignee: Sharp Kabushiki KaishaInventors: Tomoo Furukawa, Kazuyoshi Fujioka, Katsuya Ogawa, Masaaki Saitoh
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Patent number: 8228468Abstract: With the present invention, a fitting curve (f1) of the gamma curve (e1) arranged to be above a fitting curve of the gamma curve (e2), except in a region where the fitting curve (f1) shows a reflectivity of 0 and the fitting curve of the gamma curve (e2) shows a transmissivity of 0, and a gamma curve (e1) of reflective display and a gamma curve (e2) of transmissive display are obtained from measurement. Further, the fitting curve (f1) includes no gray scale inversion but at least one point of inflection (P1) where a sign of a differential coefficient is switched over. Thereby, it becomes possible to realize a liquid crystal display panel and a liquid crystal display device, for displaying images in a transmissive mode and a reflective mode, each of the liquid crystal display panel and the liquid crystal display device easily having an improvement in display quality of reflective display.Type: GrantFiled: March 3, 2008Date of Patent: July 24, 2012Assignee: Sharp Kabushiki KaishaInventors: Tomoo Furukawa, Kazuyoshi Fujioka, Katsuya Ogawa
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Patent number: 8208104Abstract: A liquid crystal display device of the present invention is a transflective liquid crystal display device that is provided with a backlight, a liquid crystal cell (10), and a reflective electrode (32) provided in the liquid crystal cell (10), and that displays an image through both a reflective display region (a) and a transmissive display region (b). In this liquid crystal display device, a front-side ?/4 plate (wave plate) for a reflective display is further provided on a side from which external light enters the liquid crystal cell (10), and a thin film (33) is provided, on the reflective electrode (32), for correcting a change in chromaticity caused by wavelength dispersion due to the ?/4 plate.Type: GrantFiled: October 19, 2007Date of Patent: June 26, 2012Assignee: Sharp Kabushiki KaishaInventors: Kazuyoshi Fujioka, Masaaki Saitoh, Tomoo Furukawa
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Publication number: 20120147287Abstract: A first electrode (62c) is provided on a first substrate (2) having a display surface of a display panel, and connected to a common electrode (com). A field effect transistor (62b) is provided on a second substrate (1) in such a manner that the first electrode (62c) is provided in a back channel side of the field effect transistor (62b) so as to be separated from the field effect transistor (62b). The field effect transistor (62b) has a gate terminal and a first drain/source terminal each of which is connected to a first wiring (Vrstn) to which a voltage for reset is to be applied. A switch (62a) has a terminal connected to a second drain/source terminal (62bs), and the other terminal connected to a second wiring (Vom) from which an output of the field effect transistor (62b) is provided.Type: ApplicationFiled: April 27, 2010Publication date: June 14, 2012Applicant: SHARP KABUSHIKI KAISHAInventor: Kazuyoshi Fujioka
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Patent number: 8199142Abstract: A liquid crystal display device includes: an emphasis conversion section performing an emphasis conversion process on image data of a current frame, based on an emphasis conversion parameter corresponding to a combination of image data of the current frame and image data of a frame immediately preceding the current frame; driving sections causing a liquid crystal display panel to display an image corresponding to the image data on which the emphasis conversion process has been performed; a temperature sensor detecting an in-device temperature of the device; an optical sensor detecting a light intensity of incident external light into the panel; and a control section calculating a temperature of the panel, based on the in-device temperature and the light intensity, and changing the emphasis conversion parameter to be used in the emphasis conversion process in accordance with the calculated temperature of the liquid crystal panel.Type: GrantFiled: July 11, 2008Date of Patent: June 12, 2012Assignee: Sharp Kabushiki KaishaInventors: Tomoo Furukawa, Kazuyoshi Fujioka
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Publication number: 20120120352Abstract: Provided is an MVA type liquid crystal display device (100) including a blue pixel (50B), a green pixel (50G), a red pixel (50R), a first linear alignment control structure (42), and a second linear alignment control structure (44). The first linear alignment control structure (42) has first straight line components extending in a first direction and second straight line components extending in a second direction that is different from the first direction in each of the blue pixel (50B), the green pixel (50G), and the red pixel (50R) independently. The second linear alignment control structure (44) has third straight line components extending in the first direction and fourth straight line components extending in the second direction in each of the blue pixel (50B), the green pixel (50G), and the red pixel (50R) independently.Type: ApplicationFiled: July 6, 2010Publication date: May 17, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Tomoo Furukawa, Kazuyoshi Fujioka
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Publication number: 20120069258Abstract: Provided is a display device provided with a non-contact type touch sensor having excellent properties, in place of a contact-point type touch sensor. The display device includes a first circuit having a first electrode (62c) formed on a first substrate (2) having a display surface of a display panel, a field effect transistor formed on a second substrate (1) opposed to the first substrate (2) so that the first electrode (62c) is spaced from the field effect transistor on the back channel side, a gate terminal of the field effect transistor being connected to a first wiring (Vrstn) and a first drain/source terminal thereof being connected to a second wiring (Vsm), and a switch, one end of which is connected to a second drain/source terminal of the field effect transistor and the other end being connected to a third wiring (Vom).Type: ApplicationFiled: March 11, 2010Publication date: March 22, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Kazuyoshi Fujioka, Atsuhito Murai
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Patent number: 8139186Abstract: The present invention provides a LCD device providing wide viewing angle display and having an improved transmittance and contrast ratio. The present invention is a liquid crystal display device including: a first substrate; a liquid crystal layer; and a second substrate in this order toward a display face, wherein each of the first and second substrates includes a polarizer and a transparent electrode, the first substrate includes a reflector, the liquid crystal layer contains a liquid crystal material with negative dielectric anisotropy, at least one of the first and second substrates includes a ?/4 retarder including a dielectric material, the ?/4 retarder is arranged to overlap with the reflector when viewed from the display face, and the ?/4 retarder is arranged on a liquid crystal side of the transparent electrode.Type: GrantFiled: August 1, 2008Date of Patent: March 20, 2012Assignee: Sharp Kabushiki KaishaInventors: Kazuyoshi Fujioka, Katsuya Ogawa, Koki Hongo
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Publication number: 20110317113Abstract: The present invention provides a liquid crystal display device capable of suppressing alignment disorder of liquid crystal and having satisfactory VR characteristics. According to the present invention, a liquid crystal display device includes a pair of substrates and a liquid crystal layer interposed between the pair of substrates, the liquid crystal display device having a reflective region and a transmissive region. One of the pair of substrates includes a longitudinal projecting portion and a liquid-crystal-layer-thickness adjusting portion for setting a liquid crystal layer thickness in the reflective region to be smaller than a liquid crystal layer thickness in the transmissive region. At least a part of the projecting portion is arranged without a gap along at least a part of a step portion of the liquid-crystal-layer-thickness adjusting portion.Type: ApplicationFiled: October 27, 2009Publication date: December 29, 2011Inventors: Katsuya Ogawa, Kazuyoshi Fujioka, Tomoo Furukawa, Masaaki Saitoh
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Publication number: 20110221786Abstract: A liquid crystal display device of at least one embodiment of the present invention includes a TN-mode liquid crystal display panel which is constituted by pixels of three colors (red, green, and blue) and a color filter. A thickness of a liquid crystal layer (cell thickness) is determined on a basis of a retardation value of green light or red light, which has a larger wavelength than blue having shortest wavelength among the three colors. A display data switching circuit carries out gradation conversion of shifting input gradation values to lower gradation values with respect to image data supplied to pixels of blue. Thus, grayscale inversion is prevented. The liquid crystal display device of the present invention produces an effect of improving transmittance of pixels of colors having wavelengths other than the wavelength of blue.Type: ApplicationFiled: August 27, 2009Publication date: September 15, 2011Applicant: Sharp Kabushiki KaishaInventors: Masaaki Saitoh, Tomoo Furukawa, Kazuyoshi Fujioka
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Publication number: 20110169880Abstract: A liquid crystal display device (10) in accordance with the present invention includes a display controller (14) (display drive section) for (i) dividing dots into a plurality of units each of which includes a predetermined number of dots and (ii) supplying pieces of gray scale data, into which a piece of input gray scale data is converted and which differ from location to location, to the respective dots in each of the plurality of units. The display controller (14) carries out the conversion so that a spatial average of the pieces of the gray scale data supplied to the respective dots in each of the plurality of units causes a gray scale display based on the piece of the input gray scale data. The display controller (14) includes a location information detection section (31), an input data conversion section (33) (gray scale data conversion section), and the like.Type: ApplicationFiled: June 17, 2009Publication date: July 14, 2011Inventors: Tomoo Furukawa, Kazuyoshi Fujioka