Patents by Inventor Hidefumi Yoshida
Hidefumi Yoshida 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: 9760102Abstract: A technique is provided that reduces dullness of a potential provided to a line such as gate line on an active-matrix substrate to enable driving the line at high speed and, at the same time, reduces the size of the picture frame region. On an active-matrix substrate (20a) are provided gate lines (13G) and source lines. On the active-matrix substrate (20a) are further provided: gate drivers (11) each including a plurality of switching elements, at least one of which is located in a pixel region, for supplying a scan signal to a gate line (13G); and lines (15L1) each for supplying a control signal to the associated gate driver (11). A control signal is supplied by a display control circuit (4) located outside the display region to the gate drivers (11) via the lines (15L1). In response to a control signal supplied, each gate driver (11) drives the gate line (13G) to which it is connected.Type: GrantFiled: August 31, 2016Date of Patent: September 12, 2017Assignee: Sharp Kabushiki KaishaInventors: Kohei Tanaka, Hidefumi Yoshida, Takeshi Noma, Ryo Yonebayashi, Takayuki Nishiyama, Mitsuhiro Murata, Yosuke Iwata
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Patent number: 9753338Abstract: A first substrate (10) of a liquid crystal display device (100) includes: an alignment film defining an initial alignment azimuthal direction (D), which is an alignment azimuthal direction of liquid crystal molecules (31) when no electric field is applied through a liquid crystal layer (30); a first electrode (11) and a second electrode (12) capable of producing a fringe electric field (FE) that aligns the liquid crystal molecules in an azimuthal direction that is different from the initial alignment azimuthal direction; and a third electrode (13) and a fourth electrode (14) capable of producing a lateral electric field that aligns the liquid crystal molecules in the initial alignment azimuthal direction.Type: GrantFiled: May 8, 2015Date of Patent: September 5, 2017Assignee: Sharp Kabushiki KaishaInventors: Mitsuhiro Murata, Hidefumi Yoshida, Yosuke Iwata, Satoshi Matsumura
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Publication number: 20170235180Abstract: Provided is a liquid crystal display device that employs a horizontal alignment mode providing wide viewing angles and is capable of achieving high-speed response and high transmittance. The liquid crystal display device includes a pair of substrates with fringe electric field structures and a liquid crystal layer interposed between the paired substrates. Each fringe electric field structure includes a planar electrode, a slit electrode, and an insulating film interposed between the planar electrode and the slit electrode. The liquid crystal layer includes liquid crystal molecules that align horizontally to the substrate surfaces of the paired substrates with no voltage applied. The liquid crystal molecules in the vicinity of the respective substrates are configured to rotate in the same direction from the alignment azimuth with no voltage applied when voltage is applied to each of the fringe electric field structures.Type: ApplicationFiled: July 29, 2015Publication date: August 17, 2017Inventors: Satoshi MATSUMURA, Mitsuhiro MURATA, Yosuke IWATA, Hidefumi YOSHIDA
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Patent number: 9684204Abstract: The present invention provides a mirror display which prevents the boundary line between a frame region and a display region from being observed in a mirror mode and which thus has improved design quality. The mirror display of the present invention includes a half mirror plate including a half mirror layer, and a display device disposed behind the half mirror plate, the display device including a display panel and a frame component that supports a peripheral portion of the display panel, and the mirror display including a reflectance adjuster that makes equal the reflectance in a display region where the half mirror layer and the display panel face each other and the reflectance in a frame region where the half mirror layer and the frame component face each other.Type: GrantFiled: January 15, 2014Date of Patent: June 20, 2017Assignee: SHARP KABUSHIKI KAISHAInventors: Akira Sakai, Takayuki Nishiyama, Masahiro Hasegawa, Hidefumi Yoshida, Shigeaki Mizushima
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Patent number: 9685131Abstract: An objective is to provide a technique for reducing the size of the picture-frame region of the active-matrix substrate and improve the freedom of design, such as the freedom in designing the active-matrix substrate. An active-matrix substrate includes a group of gate lines and a group of source lines crossing the gate lines. At least some of the gate lines have a length that is smaller than the maximum value of the width of the active-matrix substrate as measured in the direction in which the gate lines extend. The active-matrix substrate further includes pixel electrodes connected with the gate lines and source lines, and gate line driving units (11) provided in the display region for switching the gate lines to the selected or non-selected state in response to a supplied control signal.Type: GrantFiled: March 12, 2014Date of Patent: June 20, 2017Assignee: SHARP KABUSHIKI KAISHAInventors: Kohhei Tanaka, Hidefumi Yoshida
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Patent number: 9612486Abstract: A liquid crystal display device is provided that has favorable display characteristics in a display mode using a vertical electric field and a horizontal electric field. This liquid crystal display device includes a first substrate and a second substrate arranged facing each other, and a liquid crystal layer sandwiched between the first substrate and the second substrate. The liquid crystal layer has liquid crystal molecules having a negative dielectric anisotropy, and the first substrate has a plate-shaped first common electrode and a pixel electrode formed in a separate layer from the first common electrode with an insulating film therebetween. The pixel electrode has a comb-shaped structure, and the second substrate has a second common electrode with a liquid crystal orientation structure that is linear in a plan view.Type: GrantFiled: June 6, 2013Date of Patent: April 4, 2017Assignee: SHARP KABUSHIKI KAISHAInventors: Hidefumi Yoshida, Yosuke Iwata, Mitsuhiro Murata, Yasuhiro Nasu, Koichi Miyachi, Tsuyoshi Kamata
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Publication number: 20170090255Abstract: A first substrate (10) of a liquid crystal display device (100) includes: an alignment film defining an initial alignment azimuthal direction (D), which is an alignment azimuthal direction of liquid crystal molecules (31) when no electric field is applied through a liquid crystal layer (30); a first electrode (11) and a second electrode (12) capable of producing a fringe electric field (FE) that aligns the liquid crystal molecules in an azimuthal direction that is different from the initial alignment azimuthal direction; and a third electrode (13) and a fourth electrode (14) capable of producing a lateral electric field that aligns the liquid crystal molecules in the initial alignment azimuthal direction.Type: ApplicationFiled: May 8, 2015Publication date: March 30, 2017Inventors: Mitsuhiro MURATA, Hidefumi YOSHIDA, Yosuke IWATA, Satoshi MATSUMURA
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Patent number: 9575364Abstract: This liquid crystal display device (100) includes: a vertical alignment liquid crystal layer (30); first and second substrates (10, 20); first and second electrodes (11, 21) arranged on the first and second substrates to face the liquid crystal layer; and two photo-alignment films (12, 22). Each pixel region includes first and second liquid crystal domains, of which the reference alignment directions defined by the two photo-alignment films are a first direction and a second direction different from the first direction, respectively. The first electrode has a slit cut region (11R1), through which a slit (11s) has been cut to run substantially parallel to the reference alignment direction, in a part of a region allocated to each of the first and second liquid crystal domains. The width (W) of the slit is set so that when the highest grayscale voltage is applied to the first electrode, an effective applied voltage decreases by at least 0.Type: GrantFiled: October 11, 2012Date of Patent: February 21, 2017Assignee: Sharp Kabushiki KaishaInventors: Hidefumi Yoshida, Tsuyoshi Kamada, Tsuyoshi Maeda, Mitsuhiro Murata, Yoji Yoshimura, Yuichiro Yamada, Kenji Okamoto, Yosuke Iwata, Yasuhiro Nasu, Akira Sakai, Masahiro Hasegawa
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Publication number: 20170045988Abstract: A touch panel includes: a first substrate; a second substrate disposed on a viewer side of the first substrate; a liquid crystal layer provided between the first substrate and the second substrate; a plurality of pixel electrodes and a common electrode for applying a voltage to the liquid crystal layer; and a plurality of detection electrodes and a plurality of driving electrodes for a touch sensor. The first substrate includes: a first transparent substrate; and the plurality of pixel electrodes, which are formed on the liquid crystal layer side of the first transparent substrate. The second substrate includes: a second transparent substrate; and the plurality of driving electrodes and the plurality of detection electrodes formed on the liquid crystal layer side of the second transparent substrate. The touch panel does not include a conductive layer on the viewer side of the second transparent substrate.Type: ApplicationFiled: February 19, 2015Publication date: February 16, 2017Applicant: Sharp Kabushiki KaishaInventors: Yasuhiro SUGITA, Kenshi TADA, Hiroyuki OGAWA, Shinji YAMAGISHI, Jean MUGIRANEZA, Koichi MIYACHI, Hidefumi YOSHIDA, Mitsuhiro MURATA, Kohhei TANAKA
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Publication number: 20160370635Abstract: A technique is provided that reduces dullness of a potential provided to a line such as gate line on an active-matrix substrate to enable driving the line at high speed and, at the same time, reduces the size of the picture frame region. On an active-matrix substrate (20a) are provided gate lines (13G) and source lines. On the active-matrix substrate (20a) are further provided: gate drivers (11) each including a plurality of switching elements, at least one of which is located in a pixel region, for supplying a scan signal to a gate line (13G); and lines (15L1) each for supplying a control signal to the associated gate driver (11). A control signal is supplied by a display control circuit (4) located outside the display region to the gate drivers (11) via the lines (15L1). In response to a control signal supplied, each gate driver (11) drives the gate line (13G) to which it is connected.Type: ApplicationFiled: August 31, 2016Publication date: December 22, 2016Inventors: Kohei TANAKA, Hidefumi YOSHIDA, Takeshi NOMA, Ryo YONEBAYASHI, Takayuki NISHIYAMA, Mitsuhiro MURATA, Yosuke IWATA
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Publication number: 20160363884Abstract: An image forming apparatus including: a light irradiating unit configured to irradiate a photosensitive member charged by a charging unit with light to form an electrostatic latent image; a processing unit configured to generate M-bit (M is an integer not less than 2) density data indicating a density based on the input image data, to generate (M+N)-bit processing data based on the M-bit density data and N-bit (N is an integer not less than 1) correction data, to convert the processing data into a plural-bit binary drive data corresponding to a value of the processing data, and to serially output the plural-bit drive data bit by bit to generate a drive signal; and a drive unit configured to drive the light irradiating unit based on the drive signal.Type: ApplicationFiled: June 8, 2016Publication date: December 15, 2016Inventor: Hidefumi Yoshida
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Publication number: 20160343308Abstract: The present invention provides a mirror display that has improved design aesthetics and makes it possible to sufficiently improve visibility in mirror mode in dark environments. The mirror display according to the present invention includes a half mirror plate having a half mirror layer, a display device, a case, and an auxiliary illumination unit that includes an auxiliary light source. The case supports at least the half mirror plate and the display device and includes an outer frame that covers an edge of a front surface of the half mirror plate when viewed in a plan view from a viewing side. The display device is arranged on a rear side of the half mirror plate. The auxiliary light source is arranged on the rear side of the half mirror plate, the display device, or the outer frame. The auxiliary illumination unit is controlled separately from the display device and emits light towards the viewing side when the mirror display is in mirror mode.Type: ApplicationFiled: August 29, 2014Publication date: November 24, 2016Applicant: Sharp Kabushiki KaishaInventors: Masahiro HASEGAWA, Hiroyuki HAKOI, Akira SAKAI, Hidefumi YOSHIDA, Takaharu KANAI, Takako SHIMIZU, Yuuki ITOU, Atsushi OGAWA, Akira TSURUTA, Takayuki YUASA, Shigeaki MIZUSHIMA
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Patent number: 9494832Abstract: Provided is a liquid crystal display device having excellent viewing angle characteristics and high contrast in a display mode using both a vertical electric field and a horizontal electric field. This liquid crystal display device is provided with a first substrate and a second substrate disposed facing each other, and a liquid crystal layer held between said first and second substrates. The liquid crystal layer contains liquid crystal molecules having a negative dielectric anisotropy. The first substrate is provided with a flat plate first electrode, a first insulating layer, and a second electrode provided in a layer other than that of the first electrode and provided separated from the first electrode by the first insulating layer. The second electrode has multiple comb-tooth sections and multiple slits, and the second substrate has a flat plate third electrode.Type: GrantFiled: July 16, 2013Date of Patent: November 15, 2016Assignee: SHARP KABUSHIKI KAISHAInventors: Yosuke Iwata, Mitsuhiro Murata, Kohhei Tanaka, Akihito Jinda, Hidefumi Yoshida
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Publication number: 20160299394Abstract: The present invention provides a liquid crystal display device in a new display mode that is based on the horizontal alignment capable of giving a wide viewing angle and that can achieve high speed response.Type: ApplicationFiled: August 22, 2014Publication date: October 13, 2016Inventors: Hidefumi YOSHIDA, Mitsuhiro MURATA, Yosuke IWATA, Satoshi MATSUMURA
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Patent number: 9417486Abstract: Provided is a liquid crystal display device having excellent display characteristics in a display mode that uses a vertical electric field and a horizontal electric field. This liquid crystal display device is provided with a first substrate and a second substrate provided facing each other and a liquid crystal layer sandwiched between the first and second substrates. The liquid crystal layer includes liquid crystal molecules having negative dielectric anisotropy. The first substrate is provided with a plate shaped first common electrode, an insulating film, and pixel electrodes, which are provided in a layer different from the first common electrode via the insulating film, and the pixel electrodes have a comb shaped structure. The second substrate is provided with a plate shaped second common electrode and a film formed by having an alignment treatment applied to a vertical alignment film that aligns the initial orientation of the liquid crystal molecules vertically.Type: GrantFiled: May 22, 2013Date of Patent: August 16, 2016Assignee: SHARP KABUSHIKI KAISHAInventors: Mitsuhiro Murata, Yosuke Iwata, Hidefumi Yoshida
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Publication number: 20160217757Abstract: The present invention addresses the problem of reducing power consumption when switching a gate line between a selected state and a non-selected state, and of providing a narrower frame for an active matrix substrate. A gate driver (11) that scans each gate line is formed inside a display area in an active matrix substrate (20a) having gate lines (13G) and data lines formed therein. The gate driver (11) switches the gate line to either a selected state or a non-selected state, in accordance with a control signal supplied via a line (15L). The gate driver (11) includes a high-charge drive circuit (11a), a low-charge drive circuit (11b), and a shift register (11c). The high-charge drive circuit is supplied with a first DC voltage signal corresponding to the selected state via the line (15L), and charges the gate line to the potential of the first DC voltage signal.Type: ApplicationFiled: August 27, 2014Publication date: July 28, 2016Inventors: Kohhei TANAKA, Hidefumi YOSHIDA
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Publication number: 20160210923Abstract: Provided is a display panel that reduces occurrence of display irregularities in a display region even in a case where driving circuits that switch gate lines between selected and non-selected states are provided in the display region. A display panel of the present invention includes an active matrix substrate and a counter substrate, the active matrix substrate being provided with a plurality of gate lines and a plurality of source lines. The active matrix substrate includes, in a display region, a driving circuit provided with respect to each of the gate lines, for switching the gate line between a selected state and a non-selected state.Type: ApplicationFiled: August 26, 2014Publication date: July 21, 2016Inventors: Hidefumi YOSHIDA, Kohhei TANAKA
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Publication number: 20160178964Abstract: The present invention provides a mirror display that sufficiently prevents a decrease in the screen luminance in the display mode while sufficiently increasing the reflectance in the mirror mode, and also gives excellent production efficiency.Type: ApplicationFiled: July 24, 2014Publication date: June 23, 2016Inventors: Akira SAKAI, Masahiro HASEGAWA, Hiroyuki HAKOI, Hidefumi YOSHIDA, Shigeaki MIZUSHIMA
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Publication number: 20160161809Abstract: A liquid crystal display device includes: a first substrate; a second substrate; and a liquid crystal layer of a horizontal orientation type that is sandwiched between the first substrate and the second substrate. The first substrate includes a first electrode pair that applies a first horizontal electric field to the liquid crystal layer, an insulating layer provided on the first electrode pair, and a second electrode pair that is provided on the insulating layer and that applies a second horizontal electric field to the liquid crystal layer. The first electrode pair includes first and second linear electrodes provided with a gap therebetween. The second electrode pair includes third and fourth linear electrodes provided with a gap therebetween. In a plan view of the first substrate, the third and fourth linear electrodes extend in a direction perpendicular with respect to the first and second linear electrodes.Type: ApplicationFiled: July 7, 2014Publication date: June 9, 2016Applicant: Sharp Kabushiki KaishaInventors: Mitsuhiro MURATA, Yosuke IWATA, Hidefumi YOSHIDA
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Patent number: 9348176Abstract: The present invention provides a liquid crystal display device that is excellent in production efficiency, achieves a high CR, and significantly improves the viewing angle characteristics (reduces the gamma shift), while suppressing an image blur. The present invention provides a liquid crystal display device at least including: an anisotropic collimating backlight; a lower polarizing plate; a liquid crystal panel; an upper polarizing plate; and an anisotropic diffusion element, the anisotropic collimating backlight having a light distribution anisotropy of a specific angle being combined with the anisotropic diffusion element having a diffusion anisotropy of a specific angle.Type: GrantFiled: August 21, 2013Date of Patent: May 24, 2016Assignee: Sharp Kabushiki KaishaInventors: Akira Sakai, Masahiro Hasegawa, Hidefumi Yoshida