Patents by Inventor Toshimasa Ishigaki
Toshimasa Ishigaki 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: 9568787Abstract: Pixel electrodes and a common electrode are formed on a first panel. A wall is formed on the first panel. The wall includes a large insulating wall that is made of an insulating material and projects toward a second panel, and a wall electrode part that covers a side wall of the large insulating wall and functions as the pixel electrode or the common electrode. The wall includes a side surface on which an alignment film that defines an alignment of liquid crystal molecules of a liquid crystal layer is formed. The side wall of the wall is inclined with respect to a direction perpendicular to the first panel and the second panel. With this configuration, in a liquid crystal display device having the wall electrode, light leakage at the time of displaying a black image can be reduced.Type: GrantFiled: September 19, 2014Date of Patent: February 14, 2017Assignee: Japan Display Inc.Inventors: Takato Hiratsuka, Osamu Itou, Daisuke Sonoda, Toshimasa Ishigaki
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Patent number: 9519196Abstract: To prevent a phenomenon that an alignment film material is difficult to flow into the through-hole where a diameter of a through-hole for connecting between a pixel electrode and a source electrode is reduced. A liquid crystal display device comprising a TFT substrate having pixels each including a common electrode formed on an organic passivation film, an interlayer insulating film formed so as to cover the common electrode, a pixel electrode having a slit and formed on the interlayer insulating film, a through-hole formed in the organic passivation film and the interlayer insulating film, and a source electrode electrically conducted to the pixel electrode via the through-hole. A taper angle at a depth of D/2 of the through-hole is equal to or more than 50 degrees. The pixel electrode covers part of a side wall of the through-hole but does not cover the remaining part of the side wall of the through-hole.Type: GrantFiled: December 9, 2014Date of Patent: December 13, 2016Assignee: Japan Display Inc.Inventors: Yasushi Tomioka, Toshimasa Ishigaki, Hidehiro Sonoda, Sumito Ueta
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Patent number: 9500911Abstract: Provided is a liquid crystal display panel in which both the prevention of low-temperature bubble defects and the prevention of unevenness in brightness by pressure can be achieved without the need of forming multiple types of spacers differing in the height. In a liquid crystal display panel comprising a plurality of spacers 14 arranged between a pair of transparent substrates 11 and 12 and a liquid crystal 13 encapsulated between the transparent substrates, the spacers 14 are of a uniform height and each spacer 14 is substantially in a trapezoidal shape in which the ratio between the top area and the bottom area is 0.3 or less. The spacers 14 are formed on one of the transparent substrates 11 and 12. The spacers 14 are arranged at appropriate density so that the contact area ratio of the spacers' top surfaces in contact with the opposing substrate per unit area is within a range of 0.8%-1.0%.Type: GrantFiled: September 17, 2014Date of Patent: November 22, 2016Assignee: Japan Display Inc.Inventors: Toshimasa Ishigaki, Daisuke Sonoda, Miharu Otani, Tsutomu Ishibashi
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Patent number: 9488884Abstract: In a liquid crystal display device having wall structures, the generation of low-temperature shock bubbles is suppressed. Also, electrodes and the like within substrates are prevented from being damaged during manufacturing. The liquid crystal display device includes a first substrate, a second substrate that is disposed to face the first substrate, a liquid crystal layer that is disposed between the first substrate and the second substrate, wall structures that are formed on the first substrate, pixel electrodes that are disposed on at least side wall of the wall structures, a common electrode that is formed on the first substrate, and a plurality of pixels including the pixel electrodes and the common electrode, in which higher portions are partially disposed on a surface of the second substrate, and the higher portions come into contact with the wall structures to bring the first substrate into contact with the second substrate.Type: GrantFiled: August 2, 2013Date of Patent: November 8, 2016Assignee: Japan Display Inc.Inventors: Takato Hiratsuka, Osamu Itou, Miharu Otani, Toshimasa Ishigaki, Daisuke Sonoda
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Publication number: 20160291377Abstract: According to an aspect, a liquid crystal display device includes, in sequence, a thin-film transistor substrate comprising a thin-film transistor, a liquid crystal layer, and a counter substrate. The thin-film transistor substrate includes: a first translucent electrode; a color filter; metal wiring that is provided above the color filter and electrically coupled with the first translucent electrode; a light-absorbing layer provided on the metal wiring; and an optical interference layer provided on the light-absorbing layer. The optical interference layer includes the first translucent electrode.Type: ApplicationFiled: March 17, 2016Publication date: October 6, 2016Applicant: Japan Display Inc.Inventors: Masahiro KOSUGE, Toshimasa ISHIGAKI, Osamu ITOU
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Publication number: 20160291428Abstract: In a wall electrode liquid crystal display device, planar distribution of the wall structure and the electrode is optimized to improve a yield. A liquid crystal display device includes a plurality of pixels arranged in a matrix, each of the pixels having an insulator wall structure formed at a border of pixels, a wall electrode formed at a side surface of the wall structure of the border of the pixels, a source electrode which is continuous with the wall electrode and formed of a planar electrode extending in a planar direction, a first common electrode provided between source electrodes at both sides of the pixel to form a retentive capacitance, and a second common electrode provided between wall electrodes on both sides of the pixel. A slit which becomes a border of the wall electrodes of two adjacent pixels is disposed only on a top of the wall structure.Type: ApplicationFiled: May 18, 2016Publication date: October 6, 2016Inventors: Osamu ITOU, Takato HIRATSUKA, Masanao YAMAMOTO, Toshimasa ISHIGAKI, Daisuke SONODA
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Publication number: 20160246142Abstract: A manufacturing method of a display device having an array substrate includes the steps of forming a projection of an organic material in a pixel on the array substrate by patterning a photosensitive material or by inkjet, forming a TFT on the array substrate, wherein a source electrode of the TFT is formed to extend on at least part of the upper surface of the projection, forming an inorganic passivation layer over the TFT and over at least part of the upper surface of the projection, forming an organic passivation layer over the inorganic passivation layer, forming an upper insulating layer over at least part of the organic passivation layer, forming a contact hole in the inorganic passivation layer and the upper insulation layer over the upper surface of the projection, and forming a pixel electrode on the upper insulation layer which contacts the source electrode.Type: ApplicationFiled: May 5, 2016Publication date: August 25, 2016Inventors: Toshimasa ISHIGAKI, Fumio TAKAHASHI, Hideki KURIYAMA
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Publication number: 20160178963Abstract: A color filter substrate includes an insulating substrate, a first pixel electrode, a second pixel electrode, a third pixel electrode, a first color filter disposed between the first pixel electrode and the insulating substrate, a second color filter disposed between the second pixel electrode and the insulating substrate, and a third color filter disposed between the third pixel electrode and the insulating substrate, wherein the first pixel electrode, the second pixel electrode, and the third pixel electrode are adjacent to each other, the first color filter has a first end, the second color filter has a second end, and the third color filter has a third end, and two of the first end, the second end, and the third end overlap in the first overlap area.Type: ApplicationFiled: December 10, 2015Publication date: June 23, 2016Applicant: Japan Display Inc.Inventors: Osamu ITOU, Kenji NAKAO, Toshimasa ISHIGAKI, Daisuke SONODA
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Publication number: 20160170259Abstract: The elution of a color filter to a liquid crystal layer is reduced. A liquid crystal display device includes an active device substrate, a liquid crystal layer provided on the active device substrate, and a counter substrate provided on the liquid crystal layer. The active device substrate includes an active device, a common electrode, a common interconnection electrically connected to the common electrode, a reflection reduction film provided on the common interconnection, a first insulating layer provided on the reflection reduction film, and a pixel electrode having a flat portion provided on the first insulating layer and a first projecting portion protruding downwardly. The first the projecting portion is electrically connected to the active device.Type: ApplicationFiled: December 14, 2015Publication date: June 16, 2016Inventors: Osamu Itou, Kenji Nakao, Toshimasa Ishigaki, Masahiro Kosuge
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Patent number: 9366919Abstract: In a wall electrode liquid crystal display device, planar distribution of the wall structure and the electrode is optimized to improve a yield. A liquid crystal display device includes a plurality of pixels arranged in a matrix, each of the pixels having an insulator wall structure formed at a border of pixels, a wall electrode formed at a side surface of the wall structure of the border of the pixels, a source electrode which is continuous with the wall electrode and formed of a planar electrode extending in a planar direction, a first common electrode provided between source electrodes at both sides of the pixel to form a retentive capacitance, and a second common electrode provided between wall electrodes on both sides of the pixel. A slit which becomes a border of the wall electrodes of two adjacent pixels is disposed only on a top of the wall structure.Type: GrantFiled: January 11, 2013Date of Patent: June 14, 2016Assignee: Japan Display Inc.Inventors: Osamu Itou, Takato Hiratsuka, Masanao Yamamoto, Toshimasa Ishigaki, Daisuke Sonoda
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Patent number: 9362409Abstract: A manufacturing method of a display device having an array substrate includes the steps of forming a projection of an organic material in a pixel on the array substrate by patterning a photosensitive material or by inkjet, forming a TFT on the array substrate, wherein a source electrode of the TFT is formed to extend on at least part of the upper surface of the projection, forming an inorganic passivation layer over the TFT and over at least part of the upper surface of the projection, forming an organic passivation layer over the inorganic passivation layer, forming an upper insulating layer over at least part of the organic passivation layer, forming a contact hole in the inorganic passivation layer and the upper insulation layer over the upper surface of the projection, and forming a pixel electrode on the upper insulation layer which contacts the source electrode.Type: GrantFiled: July 13, 2015Date of Patent: June 7, 2016Assignee: JAPAN DISPLAY INC.Inventors: Toshimasa Ishigaki, Fumio Takahashi, Hideki Kuriyama
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Publication number: 20160154273Abstract: In an embodiment, a color filter substrate includes an substrate, first to fifth lines, first to third switching elements, first to third electrodes, color filter layer between electrodes and the substrate, and insulating layer with first to third apertures. The first electrode is formed in a first area defined by lines at the first line side, and the second electrode is formed in the first area at the second line side. The third electrode is formed in a second area defined by lines. Electrodes are connected to switching elements through apertures respectively. The first aperture is formed at the first line side, and the second aperture is formed at the second line side.Type: ApplicationFiled: November 30, 2015Publication date: June 2, 2016Applicant: Japan Display Inc.Inventors: Osamu ITOU, Kenji NAKAO, Toshimasa ISHIGAKI, Daisuke SONODA
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Publication number: 20160154510Abstract: According to one embodiment, a position detecting substrate includes a first base material, a sensing electrode formed of metal on the first base material and configured to detect a position, an adhesive layer facing the first base material and the sensing electrode and including a resin, and a second base material adhered to the sensing electrode by the adhesive layer, wherein assuming the force required to peel the sensing electrode from the first base material to be A, the force required to peel the adhesive layer from the first base material to be B and the force required to peel the second base material from the adhesive layer to be C, then A>B, or A>C.Type: ApplicationFiled: November 19, 2015Publication date: June 2, 2016Applicant: Japan Display Inc.Inventors: Tatsuya IDE, Toshimasa Ishigaki, Daisuke Sonoda
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Publication number: 20160116797Abstract: Disclosed is a liquid crystal display device including an active element substrate having an active element; a first layer provided on the active element and having a first hole formed therein, the first layer being one of a first insulating layer and a color filter; a second layer provided on the first layer and having a second hole formed therein, the second layer being the other of the first insulating layer and the color filter; a common electrode provided on the second layer; a second insulating layer having a plate-like portion provided on the common electrode and a first contact portion protruded downward; and a pixel electrode having a second contact portion protruded downward. The first contact portion is provided inside the second hole, and the second contact portion is provided inside the first hole and inside the second hole and electrically connected to the active element.Type: ApplicationFiled: October 27, 2015Publication date: April 28, 2016Inventors: Osamu ITOU, Kenji NAKAO, Toshimasa ISHIGAKI, Masahiro KOSUGE
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Patent number: 9316874Abstract: A liquid crystal display device has a pair of wall electrodes facing each other, which is disposed on pixels on a first substrate, functions as one of pixel electrodes and a common electrode, and takes a posture of standing on the first substrate. Also, the liquid crystal display device has a center electrode that is disposed between the pair of wall electrodes, functions as the other of the pixel electrodes and the common electrode, has a convexity lower in height than the pair of wall electrodes, and makes a width in a direction along which the pair of wall electrodes faces each other gradually smaller toward the second substrate. According to this liquid crystal display device, since a vertical electric field can be prevented from being developed on an upper side of the center electrode, a transmittance of light can be improved.Type: GrantFiled: October 29, 2013Date of Patent: April 19, 2016Assignee: Japan Display Inc.Inventors: Takato Hiratsuka, Osamu Itou, Daisuke Sonoda, Toshimasa Ishigaki
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METHOD OF MANUFACTURING ELECTRODE SUBSTRATE, ELECTRODE SUBSTRATE, DISPLAY APPARATUS AND INPUT DEVICE
Publication number: 20160062512Abstract: A manufacturing process of an electrode substrate includes a step of forming a protective layer so as to cover a conductor pattern by applying raw material liquid discharged as droplets to an upper surface of a substrate in a first region and a second region of the upper surface of the substrate. At this time, an application amount of the raw material liquid per unit area in the second region is made smaller than an application amount of the raw material liquid per unit area in the first region, so that an average film thickness of the protective layer of a portion formed in the second region is made smaller than an average film thickness of the protective layer of a portion formed in the first region.Type: ApplicationFiled: August 20, 2015Publication date: March 3, 2016Inventors: Koji Ishizaki, Hayato Kurasawa, Masanobu Ikeda, Yoshihiro Watanabe, Toshimasa Ishigaki, Daisuke Sonoda, Tatsuya Ide -
Patent number: 9274387Abstract: Pixel electrodes each include a pixel plane portion expanded along a surface of the substrate, and a pixel wall portion rising up from the pixel plane portion. Common electrodes each include a common plane portion expanded along a surface of the substrate, and a common wall portion rising up from the common plane portion so as to face the pixel wall portion. Each of the compartment areas has the pixel wall portion on one of right and left sides in the lateral direction, and has the common wall portion on the other of the right and left sides. Molecules of the liquid crystal material are tilted up from the pixel wall portions in a direction of the common wall portion by the electric field. The respective pixel wall portions of the adjacent compartment areas are positioned on opposite sides to each other in the lateral direction.Type: GrantFiled: March 24, 2014Date of Patent: March 1, 2016Assignee: Japan Display Inc.Inventors: Takato Hiratsuka, Osamu Itou, Daisuke Sonoda, Toshimasa Ishigaki
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Publication number: 20160054608Abstract: A first electrode 30 for the touch panel is formed on an outer side of a counter substrate 200, and the protection film 210 is formed over the first electrode 30 to cover it. A defect 211 in the protection film 210 is filled in with another protection film 210 by inkjet coating. The surface of the protection film 210 is rubbed to a rough surface finish. The polarization plate 220 is attached to the rough surface of the protection film 210 via an adhesive material 221. Since the defective region is repaired by the formation of the protection film 210, corrosion of the first electrode (wiring) 30 due to the presence of the adhesive material 221 can be prevented, and since the surface of the second protection film 210 is made rough, a resulting increase in adhering surface area enhances the adhesion for attaching the polarization plate 220.Type: ApplicationFiled: August 24, 2015Publication date: February 25, 2016Inventors: Daisuke SONODA, Tatsuya IDE, Toshimasa ISHIGAKI, Masanobu IKEDA, Koji ISHIZAKI, Hayato KURASAWA, Yoshihiro WATANABE
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Publication number: 20160041439Abstract: In an IPS mode liquid crystal display device, an interlayer insulating film is formed on a common electrode formed in a planar shape, and a pixel electrode is formed on the interlayer insulating film. The distance between the TFT substrate and the counter substrate is determined by a columnar spacer. The pixel electrode includes one comb-shaped electrode and a contact part. The tip of the comb-shaped electrode overlaps the columnar spacer as seen in a plan view. The columnar spacer is present in the area in which an electric field that allows the liquid crystal molecules to rotate backward occurs when a voltage is applied to the pixel electrode, so that the reverse rotation of the liquid crystal molecules does not occur, and it is possible to prevent the domain from occurring.Type: ApplicationFiled: July 31, 2015Publication date: February 11, 2016Inventors: Takeshi Sakai, Toshimasa Ishigaki, Satoru Kawasaki
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Publication number: 20160004135Abstract: A provided is a liquid crystal display device with a high definition screen and less color mixture. On an array substrate, a pixel is formed between the adjacent video signal lines, a color filter is formed within the pixel, a flattening film is formed on the color filter, a lower layer is formed on the flattening film, and an upper layer having a slit is formed on the lower layer with an interlayer insulating film interposed therebetween; and on the array substrate, an opposite substrate is arranged with a liquid crystal layer interposed therebetween. When a distance from the top of the video signal line working as a light shielding film to the bottom of the liquid crystal layer is defined as d and a space between the centers of the video signal lines separating the pixel is defined as w, a relation of d?0.3 w is satisfied.Type: ApplicationFiled: July 2, 2015Publication date: January 7, 2016Inventors: Kenji NAKAO, Osamu Itou, Toshimasa Ishigaki, Daisuke Sonoda, Takato Hiratsuka