Patents by Inventor Mika Oiwa
Mika Oiwa 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: 9842555Abstract: According to one embodiment, a lateral electric-field type of liquid crystal display device includes a display panel and a controller, wherein a frame frequency falls within a range of 1 Hz to 10 Hz, an off-leak current of each of the TFTs has a value of 1×10?15 A or less, a resistivity of a liquid crystal and a resistivity of an alignment film both fall within one of a first range and a second range, the first range being 1×1013 to 5×1013 ?·cm, the second range being 5×1013 to 5×1014 ?·cm, and a relationship of “R1× C1?R2×C2” is satisfied, where R1 is a resistance and C1 is a capacity with respect to each pixel, R2 is a resistance and C2 is a capacity with respect to each pixel.Type: GrantFiled: July 7, 2016Date of Patent: December 12, 2017Assignee: Japan Display Inc.Inventors: Daiichi Suzuki, Yukio Tanaka, Kenji Nakao, Kazuhiro Nishiyama, Shinichi Komura, Shinichiro Oka, Mika Oiwa
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Patent number: 9664962Abstract: A pixel electrode formed into a slit structure with striped electrodes opposed to each other for a zero rubbing angle can provide fast response since rotational directions of the liquid crystals become opposite at both sides of the slit in the striped electrodes. The electrode structure, however, poses a problem of low transmittance. Provided is a liquid crystal display device of IPS-Pro scheme including a pixel electrode with one pair of striped electrodes. The first striped electrode includes a short electrode section and long electrode sections, and the second striped electrode also includes a short electrode section and long electrode sections. The long electrode sections of the first striped electrode are disposed adjacently to those of the second striped electrode. Liquid crystals are aligned in a lengthwise direction of the striped electrodes.Type: GrantFiled: November 4, 2015Date of Patent: May 30, 2017Assignee: Japan Display Inc.Inventors: Mika Oiwa, Shinichiro Oka, Toshiharu Matsushima
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Patent number: 9601071Abstract: According to one embodiment, a lateral electric-field type of liquid crystal display device includes a display panel and a controller, wherein a frame frequency falls within a range of 1 Hz to 10 Hz, an off-leak current of each of the TFTs has a value of 1×10?15 A or less, a resistivity of a liquid crystal and a resistivity of an alignment film both fall within one of a first range and a second range, the first range being 1×1013 to 5×1013 ?·cm, the second range being 5×1013 to 5×1014 ?·cm, and a relationship of “R1×C1?R2×C2” is satisfied, where R1 is a resistance and C1 is a capacity with respect to each pixel, R2 is a resistance and C2 is a capacity with respect to each pixel.Type: GrantFiled: October 9, 2014Date of Patent: March 21, 2017Assignee: Japan Display Inc.Inventors: Daiichi Suzuki, Yukio Tanaka, Kenji Nakao, Kazuhiro Nishiyama, Shinichi Komura, Shinichiro Oka, Mika Oiwa
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Patent number: 9552784Abstract: According to one embodiment, a lateral electric-field type of liquid crystal display device includes a display panel including a plurality of liquid crystal pixels arranged in a matrix, and a controller configured to perform intermittent driving to rewrite an image signal to the liquid crystal pixels, wherein a frame frequency falls within a range of 10 Hz to 20 Hz, and an absolute value of a flexo coefficient (e11, e33) of a liquid crystal applied to the liquid crystal pixels is 1.6 pC/m or less.Type: GrantFiled: August 1, 2014Date of Patent: January 24, 2017Assignee: Japan Display Inc.Inventors: Daiichi Suzuki, Yukio Tanaka, Kenji Nakao, Kazuhiro Nishiyama, Shinichi Komura, Shinichiro Oka, Mika Oiwa
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Publication number: 20170004793Abstract: According to one embodiment, a lateral electric-field type of liquid crystal display device includes a display panel and a controller, wherein a frame frequency falls within a range of 1 Hz to 10 Hz, an off-leak current of each of the TFTs has a value of 1×10?15 A or less, a resistivity of a liquid crystal and a resistivity of an alignment film both fall within one of a first range and a second range, the first range being 1×1013 to 5×1013 ?·cm, the second range being 5×1013 to 5×1014 ?·cm, and a relationship of “R1× C1?R2×C2” is satisfied, where R1 is a resistance and C1 is a capacity with respect to each pixel, R2 is a resistance and C2 is a capacity with respect to each pixel.Type: ApplicationFiled: July 7, 2016Publication date: January 5, 2017Applicant: Japan Display Inc.Inventors: Daiichi SUZUKI, Yukio TANAKA, Kenji NAKAO, Kazuhiro NISHIYAMA, Shinichi KOMURA, Shinichiro OKA, Mika OIWA
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Patent number: 9377650Abstract: To achieve a liquid crystal display device of a field sequential system with sufficient response speed and uniformity of viewing angle, the liquid crystal display device includes polarizing plates attached on front and back surfaces of a liquid crystal display panel, a backlight provided on the back surface of the liquid crystal display panel, and an anisotropic diffusion film provided on the front side of the liquid crystal display panel. The liquid crystal display panel and the backlight are driven by the field sequential system. The distribution of the contrast of the liquid crystal display panel varies depending on the azimuth direction. Then, the azimuth direction in which the contrast of the liquid crystal display panel is small is equal to the azimuth direction in which the emission intensity when parallel light is incident on the anisotropic diffusion film is strong, to achieve uniform contrast in all azimuth directions.Type: GrantFiled: January 16, 2015Date of Patent: June 28, 2016Assignee: Japan Display Inc.Inventors: Mika Oiwa, Shinichiro Oka
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Publication number: 20160054629Abstract: A pixel electrode formed into a slit structure with striped electrodes opposed to each other for a zero rubbing angle can provide fast response since rotational directions of the liquid crystals become opposite at both sides of the slit in the striped electrodes. The electrode structure, however, poses a problem of low transmittance. Provided is a liquid crystal display device of IPS-Pro scheme including a pixel electrode with one pair of striped electrodes. The first striped electrode includes a short electrode section and long electrode sections, and the second striped electrode also includes a short electrode section and long electrode sections. The long electrode sections of the first striped electrode are disposed adjacently to those of the second striped electrode. Liquid crystals are aligned in a lengthwise direction of the striped electrodes.Type: ApplicationFiled: November 4, 2015Publication date: February 25, 2016Inventors: Mika OIWA, Shinichiro OKA, Toshiharu MATSUSHIMA
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Patent number: 9207503Abstract: A pixel electrode formed into a slit structure with striped electrodes opposed to each other for a zero rubbing angle can provide fast response since rotational directions of the liquid crystals become opposite at both sides of the slit in the striped electrodes. The electrode structure, however, poses a problem of low transmittance. Provided is a liquid crystal display device of IPS-Pro scheme including a pixel electrode with one pair of striped electrodes. The first striped electrode includes a short electrode section and long electrode sections, and the second striped electrode also includes a short electrode section and long electrode sections. The long electrode sections of the first striped electrode are disposed adjacently to those of the second striped electrode. Liquid crystals are aligned in a lengthwise direction of the striped electrodes.Type: GrantFiled: April 24, 2014Date of Patent: December 8, 2015Assignee: JAPAN DISPLAY INC.Inventors: Mika Oiwa, Shinichiro Oka, Toshiharu Matsushima
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Publication number: 20150198841Abstract: To achieve a liquid crystal display device of a field sequential system with sufficient response speed and uniformity of viewing angle, the liquid crystal display device includes polarizing plates attached on front and back surfaces of a liquid crystal display panel, a backlight provided on the back surface of the liquid crystal display panel, and an anisotropic diffusion film provided on the front side of the liquid crystal display panel. The liquid crystal display panel and the backlight are driven by the field sequential system. The distribution of the contrast of the liquid crystal display panel varies depending on the azimuth direction. Then, the azimuth direction in which the contrast of the liquid crystal display panel is small is equal to the azimuth direction in which the emission intensity when parallel light is incident on the anisotropic diffusion film is strong, to achieve uniform contrast in all azimuth directions.Type: ApplicationFiled: January 16, 2015Publication date: July 16, 2015Inventors: Mika OIWA, Shinichiro OKA
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Publication number: 20150109558Abstract: A liquid crystal display device includes a backlight provided on a liquid crystal cell in which a liquid crystal layer is interposed between first and second substrates, a first polarizing plate is attached to the outside of the first substrate, and a second polarizing plate is attached to the outside of the second substrate. The liquid crystal cell and the backlight are driven by a field sequential system. A diffusion film is provided on the first polarizing plate which is located on the display surface side of the liquid crystal cell. The backlight is a collimated backlight with a half value width of 20 degrees or less. The viewing angle is increased by the diffusion film while the reduction of the contrast due to the use of the diffusion film is prevented by the collimated backlight, to achieve a liquid crystal display device with sufficient response time and contrast.Type: ApplicationFiled: October 21, 2014Publication date: April 23, 2015Inventors: Shinichiro Oka, Mika Oiwa
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Publication number: 20150102988Abstract: According to one embodiment, a lateral electric-field type of liquid crystal display device includes a display panel and a controller, wherein a frame frequency falls within a range of 1 Hz to 10 Hz, an off-leak current of each of the TFTs has a value of 1×10?15 A or less, a resistivity of a liquid crystal and a resistivity of an alignment film both fall within one of a first range and a second range, the first range being 1×1013 to 5×1013 ?·cm, the second range being 5×1013 to 5×1014 ?·cm, and a relationship of “R1×C1?R2×C2” is satisfied, where R1 is a resistance and C1 is a capacity with respect to each pixel, R2 is a resistance and C2 is a capacity with respect to each pixel.Type: ApplicationFiled: October 9, 2014Publication date: April 16, 2015Applicant: Japan Display Inc.Inventors: Daiichi SUZUKI, Yukio TANAKA, Kenji NAKAO, Kazuhiro NISHIYAMA, Shinichi KOMURA, Shinichiro OKA, Mika OIWA
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Publication number: 20150035816Abstract: According to one embodiment, a lateral electric-field type of liquid crystal display device includes a display panel including a plurality of liquid crystal pixels arranged in a matrix, and a controller configured to perform intermittent driving to rewrite an image signal to the liquid crystal pixels, wherein a frame frequency falls within a range of 10 Hz to 20 Hz, and an absolute value of a flexo coefficient (e11, e33) of a liquid crystal applied to the liquid crystal pixels is 1.6 pC/m or less.Type: ApplicationFiled: August 1, 2014Publication date: February 5, 2015Applicant: Japan Display Inc.Inventors: Daiichi SUZUKI, Yukio Tanaka, Kenji Nakao, Kazuhiro Nishiyama, Shinichi Komura, Shinichiro Oka, Mika Oiwa
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Publication number: 20140320791Abstract: A pixel electrode formed into a slit structure with striped electrodes opposed to each other for a zero rubbing angle can provide fast response since rotational directions of the liquid crystals become opposite at both sides of the slit in the striped electrodes. The electrode structure, however, poses a problem of low transmittance. Provided is a liquid crystal display device of IPS-Pro scheme including a pixel electrode with one pair of striped electrodes. The first striped electrode includes a short electrode section and long electrode sections, and the second striped electrode also includes a short electrode section and long electrode sections. The long electrode sections of the first striped electrode are disposed adjacently to those of the second striped electrode. Liquid crystals are aligned in a lengthwise direction of the striped electrodes.Type: ApplicationFiled: April 24, 2014Publication date: October 30, 2014Applicant: Japan Display Inc.Inventors: Mika OIWA, Shinichiro OKA, Toshiharu MATSUSHIMA
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Publication number: 20140307212Abstract: A pixel electrode formed into a slit structure with striped electrodes opposed to each other for a zero rubbing angle can provide fast response since rotational directions of the liquid crystals become opposite at both sides of the slit in the striped electrodes. The electrode structure, however, poses a problem of low transmittance. Provided is a liquid crystal display device of IPS-Pro scheme including a pixel electrode with one pair of striped electrodes, an electrode section of one of striped electrodes being partially interposed between electrode sections of other striped electrode, and liquid crystals being oriented in a lengthwise direction of the striped electrodes.Type: ApplicationFiled: April 10, 2014Publication date: October 16, 2014Applicant: Japan Display Inc.Inventors: Shinichiro OKA, Mika OIWA, Yasushi TOMIOKA, Toshiharu MATSUSHIMA
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Patent number: 8848157Abstract: A liquid crystal display includes: a pair of substrates including at least one transparent substrate; a liquid crystal layer disposed between the pair of substrates; and an electrode group formed on at least one of the pair of substrates so as to apply an electric field to the liquid crystal layer. The liquid crystal layer contains at least one kind of liquid crystalline compound and at least one kind of chiral dopant. The concentration c of the chiral dopant is lower than a saturation solubility s thereof. The concentration c of the chiral dopant and a helical twisting power [HTP] of the chiral dopant satisfy a relation of [HTP]·c?5.5 (?m?1).Type: GrantFiled: August 20, 2010Date of Patent: September 30, 2014Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Mika Oiwa, Shintaro Takeda, Kotaro Araya, Yasushi Tomioka, Yoshiro Mikami
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Publication number: 20140063435Abstract: A liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and an electrode group provided on at least one of the first substrate and the second substrate, and that applies an electric field to the liquid crystal layer, wherein the liquid crystal layer contains at least one liquid crystalline compound, and at least one chiral dopant, wherein one of the liquid crystalline compounds contained in the liquid crystal layer develops a blue phase liquid crystal, and wherein the liquid crystal layer has a storage elastic modulus G? of 4,000 Pa or more at 25° C. and 1 Hz frequency.Type: ApplicationFiled: September 5, 2013Publication date: March 6, 2014Applicant: JAPAN DISPLAY INC.Inventors: Mika OIWA, Shinichi KOMURA
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Patent number: 8648991Abstract: Provided is a liquid crystal display device, including: a first substrate including a first electrode and a second electrode each including a plurality of linear electrodes and formed so as to be comb-like; a second substrate; a blue-phase liquid crystal layer; first drain lines and second drain lines extending in Y direction and provided side by side in X direction; gate lines extending in the X direction; a first thin film transistor for supplying a drain signal from one of the first drain lines to the first electrode; a second thin film transistor for supplying a drain signal from one of the second drain lines to the second electrode, which is plate-like and formed on the blue-phase liquid crystal layer side of the second substrate so as to cover at least a region in which pixels are formed.Type: GrantFiled: December 19, 2011Date of Patent: February 11, 2014Assignee: Japan Display Inc.Inventors: Mika Oiwa, Shintaro Takeda, Shinichi Komura
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Publication number: 20120162560Abstract: Provided is a liquid crystal display device, including: a first substrate including a first electrode and a second electrode each including a plurality of linear electrodes and formed so as to be comb-like; a second substrate; a blue-phase liquid crystal layer; first drain lines and second drain lines extending in Y direction and provided side by side in X direction; gate lines extending in the X direction; a first thin film transistor for supplying a drain signal from one of the first drain lines to the first electrode; a second thin film transistor for supplying a drain signal from one of the second drain lines to the second electrode, which is plate-like and formed on the blue-phase liquid crystal layer side of the second substrate so as to cover at least a region in which pixels are formed.Type: ApplicationFiled: December 19, 2011Publication date: June 28, 2012Inventors: Mika OIWA, Shintaro Takeda, Shinichi Komura
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Publication number: 20110075073Abstract: A liquid crystal display includes: a pair of substrates including at least one transparent substrate; a liquid crystal layer disposed between the pair of substrates; and an electrode group formed on at least one of the pair of substrates so as to apply an electric field to the liquid crystal layer. The liquid crystal layer contains at least one kind of liquid crystalline compound and at least one kind of chiral dopant. The concentration c of the chiral dopant is lower than a saturation solubility s thereof. The concentration c of the chiral dopant and a helical twisting power [HTP] of the chiral dopant satisfy a relation of [HTP]·c?5.5 (?m?1).Type: ApplicationFiled: August 20, 2010Publication date: March 31, 2011Inventors: Mika Oiwa, Shintaro Takeda, Kotaro Araya, Yasushi Tomioka, Yoshiro Mikami