Patents by Inventor Kazuhiko Tamai
Kazuhiko Tamai 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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Publication number: 20090161049Abstract: In a liquid crystal display apparatus in which a liquid crystal domain having radially tilted orientation is formed in a pixel, high-quality reflection display with occurrence of an afterimage being suppressed is attained. The liquid crystal display apparatus of this invention includes a first substrate 110a, a second substrate 110b and a vertically aligned liquid crystal layer 120 placed therebetween, and has pixels each including a first electrode 111, a second electrode 131 and a liquid crystal layer located therebetween. The first substrate includes a reflection layer 116 having a concave/convex surface and an insulating layer 117 formed to cover the reflection layer. The first electrode 111 is placed on the insulating layer 117 and has a shape defined to exert alignment regulating force with which at least one liquid crystal domain having radially tilted orientation is formed in the liquid crystal layer in a voltage applied state.Type: ApplicationFiled: March 20, 2006Publication date: June 25, 2009Inventors: Noriaki Onishi, Kazuhiko Tamai, Takaaki Okamoto
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Publication number: 20090147199Abstract: In a liquid crystal display element of the present invention, the aligning capability for imparting pre-tilt angles to a liquid crystal material is imparted only to the surface of the alignment film of one of the substrates, the material layer having dielectric anisotropy includes a chiral material and a liquid crystal material with a nematic liquid crystal phase, 0.25?d/p?0.50 is satisfied assuming that the thickness of the material layer having the dielectric anisotropy is d and the chiral pitch length of the liquid crystal material is p, and 1000×d/p??n×d is satisfied assuming that the refractive index anisotropy of the liquid crystal material is ?n.Type: ApplicationFiled: September 12, 2006Publication date: June 11, 2009Inventors: Yasuhiro Kume, Takashi Kurihara, Kazuhiko Tamai, Takaaki Okamoto, Shinya Saeki
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Publication number: 20090115958Abstract: A liquid crystal display element of the present invention is arranged so that a material layer having dielectric anisotropy includes a chiral material and a liquid crystal material with a nematic liquid crystal phase, and 0.25?d/p?0.50 is satisfied assuming that the thickness of the material layer is d and the chiral pitch length of the liquid crystal material is p.Type: ApplicationFiled: September 12, 2006Publication date: May 7, 2009Inventors: Takashi Kurihara, Yasuhiro Kume, Kazuhiko Tamai, Takaaki Okamoto, Shinya Saeki
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Patent number: 7443475Abstract: A liquid crystal display apparatus includes a first substrate; a second substrate provided so as to face the first substrate; a vertical alignment type liquid crystal layer provided between the first substrate and the second substrate; a plurality of pixel areas each including a first electrode provided on the first substrate, a second electrode provided on the second substrate, and the liquid crystal layer provided between the first electrode and the second electrode; and a wall structure regularly arranged on a surface of the first electrode closer to the liquid crystal layer. The liquid crystal layer, when being provided with at least a prescribed voltage, forms at least one liquid crystal domain exhibiting a radially inclined orientation in an area substantially surrounded by the wall structure.Type: GrantFiled: June 29, 2007Date of Patent: October 28, 2008Assignee: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi, Takaaki Okamoto
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Publication number: 20080225211Abstract: The liquid crystal display device of the present invention includes a first substrate, a second substrate and a vertically aligned liquid crystal layer interposed between the first and second substrate. The device has a plurality of pixels each including a first electrode formed on the first substrate, a second electrode formed on the second substrate, and the liquid crystal layer interposed between the first and second electrode, and a shading region provided around the pixels. A plurality of supports for defining the thickness of the liquid crystal layer are placed regularly on the surface of the first or second substrate facing the liquid crystal layer in the shading region. The liquid crystal layer forms at least one liquid crystal domain exhibiting axisymmetric alignment when at least a predetermined voltage is applied, and the tilt direction of liquid crystal molecules in the at least one liquid crystal domain is defined with inclined sides of the plurality of supports.Type: ApplicationFiled: May 20, 2008Publication date: September 18, 2008Applicant: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi
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Publication number: 20080218677Abstract: The liquid crystal display device includes a first substrate 1110a, a second substrate 1110b placed to face the first substrate, and a liquid crystal layer 1120 interposed between the first substrate and the second substrate. The liquid crystal display device has a plurality of pixels each including a first electrode 1111 formed on the first substrate, a second electrode 1131 formed on the second substrate, and the liquid crystal layer interposed between the first electrode and the second electrode. The second electrode 1131 has at least one opening 1114 formed at a predetermined position in the pixel, the first substrate has a shading region in gaps between the plurality of pixels, and a wall structure 1115 is placed regularly on the surface of the first substrate facing the liquid crystal layer in the shading region.Type: ApplicationFiled: May 1, 2008Publication date: September 11, 2008Applicant: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi, Takashi Kurihara
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Patent number: 7391489Abstract: The liquid crystal display device of the present invention includes a first substrate, a second substrate and a vertically aligned liquid crystal layer interposed between the first and second substrate. The device has a plurality of pixels each including a first electrode formed on the first substrate, a second electrode formed on the second substrate, and the liquid crystal layer interposed between the first and second electrode, and a shading region provided around the pixels. A plurality of supports for defining the thickness of the liquid crystal layer are placed regularly on the surface of the first or second substrate facing the liquid crystal layer in the shading region. The liquid crystal layer forms at least one liquid crystal domain exhibiting axisymmetric alignment when at least a predetermined voltage is applied, and the tilt direction of liquid crystal molecules in the at least one liquid crystal domain is defined with inclined sides of the plurality of supports.Type: GrantFiled: March 8, 2005Date of Patent: June 24, 2008Assignee: Sharp Kabushiki KaishiaInventors: Yasuhiro Kume, Kazuhiko Tamai, Noriaki Onishi
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Patent number: 7385660Abstract: The liquid crystal display device includes a first substrate 1110a, a second substrate 1110b placed to face the first substrate, and a liquid crystal layer 1120 interposed between the first substrate and the second substrate. The liquid crystal display device has a plurality of pixels each including a first electrode 1111 formed on the first substrate, a second electrode 1131 formed on the second substrate, and the liquid crystal layer interposed between the first electrode and the second electrode. The second electrode 1131 has at least one opening 1114 formed at a predetermined position in the pixel, the first substrate has a shading region in gaps between the plurality of pixels, and a wall structure 1115 is placed regularly on the surface of the first substrate facing the liquid crystal layer in the shading region.Type: GrantFiled: December 7, 2004Date of Patent: June 10, 2008Assignee: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi, Takashi Kurihara
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Publication number: 20070273799Abstract: A liquid crystal display apparatus includes a first substrate; a second substrate provided so as to face the first substrate; a vertical alignment type liquid crystal layer provided between the first substrate and the second substrate; a plurality of pixel areas each including a first electrode provided on the first substrate, a second electrode provided on the second substrate, and the liquid crystal layer provided between the first electrode and the second electrode; and a wall structure regularly arranged on a surface of the first electrode closer to the liquid crystal layer. The liquid crystal layer, when being provided with at least a prescribed voltage, forms at least one liquid crystal domain exhibiting a radially inclined orientation in an area substantially surrounded by the wall structure.Type: ApplicationFiled: June 29, 2007Publication date: November 29, 2007Applicant: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi, Takaaki Okamoto
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Patent number: 7277140Abstract: The invention provides an image shifting device including at least one image shifting part for periodically shifting the position of an optical axis. The image shifting part includes a liquid crystal device 10 for switching a polarization direction of light between two orthogonal directions in accordance with High/Low level of an applied voltage, and a birefringent device 11 having different refractive indexes depending upon the polarization direction of the light. The liquid crystal device 10 and the birefringent device 11 are disposed to transmit light in this order. A liquid crystal layer included in the liquid crystal device 10 is made of a TN liquid crystal layer that satisfies a relationship formula of 0.25<d/p<1, wherein a natural pitch length is indicated by p and a cell gap is indicated by d, and is disposed to be twisted at 90° within the liquid crystal cell.Type: GrantFiled: November 28, 2002Date of Patent: October 2, 2007Assignee: Sharp Kabushiki KaishaInventors: Takashi Kurihara, Yasuhiro Kume, Hiroshi Nakanishi, Kazuhiko Tamai
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Patent number: 7253872Abstract: A liquid crystal display apparatus includes a first substrate; a second substrate provided so as to face the first substrate; a vertical alignment type liquid crystal layer provided between the first substrate and the second substrate; a plurality of pixel areas each including a first electrode provided on the first substrate, a second electrode provided on the second substrate, and the liquid crystal layer provided between the first electrode and the second electrode; and a wall structure regularly arranged on a surface of the first electrode closer to the liquid crystal layer. The liquid crystal layer, when being provided with at least a prescribed voltage, forms at least one liquid crystal domain exhibiting a radially inclined orientation in an area substantially surrounded by the wall structure.Type: GrantFiled: September 29, 2004Date of Patent: August 7, 2007Assignee: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi, Takaaki Okamoto
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Patent number: 7002659Abstract: There is provided a liquid crystal panel in which the brightness of an image is high, and deterioration in display quality due to defects such as uneven display or uneven brightness is suppressed. The liquid crystal panel includes a pixel portion including a plurality of thin film transistors and pixel electrodes formed on a first substrate, a second substrate, a liquid crystal and gap holding members provided between the first substrate and the second substrate, and a microlens array including a plurality of microlenses and provided on a surface of the second substrate, the surface being opposite to the first substrate.Type: GrantFiled: November 22, 2000Date of Patent: February 21, 2006Assignees: Semiconductor Energy Laboratory Co., Ltd., Sharp Kabushiki KaishaInventors: Shunpei Yamazaki, Jun Koyama, Kazuhiko Tamai, Yutaka Takafuji
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Publication number: 20050280754Abstract: The liquid crystal display device includes a first substrate, a second substrate opposed to the first substrate, and a vertically aligned liquid crystal layer interposed between the first and second substrates, and has a plurality of pixels each including a first electrode formed on the first substrate, a second electrode formed on the second substrate, and the liquid crystal layer interposed between the first and second electrodes. The first substrate has a shading region in gaps between the plurality of pixels, and a wall structure is placed regularly on the surface of the first substrate facing the liquid crystal layer in the shading region. A color filter layer of the second substrate has at least one hole formed at a predetermined position in each pixel.Type: ApplicationFiled: June 16, 2005Publication date: December 22, 2005Inventors: Yasuhiro Kume, Noriaki Onishi, Kazuhiko Tamai, Hiroaki Kojima, Nobukazu Nagae
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Publication number: 20050200784Abstract: The liquid crystal display device of the present invention includes a first substrate, a second substrate and a vertically aligned liquid crystal layer interposed between the first and second substrate. The device has a plurality of pixels each including a first electrode formed on the first substrate, a second electrode formed on the second substrate, and the liquid crystal layer interposed between the first and second electrode, and a shading region provided around the pixels. A plurality of supports for defining the thickness of the liquid crystal layer are placed regularly on the surface of the first or second substrate facing the liquid crystal layer in the shading region. The liquid crystal layer forms at least one liquid crystal domain exhibiting axisymmetric alignment when at least a predetermined voltage is applied, and the tilt direction of liquid crystal molecules in the at least one liquid crystal domain is defined with inclined sides of the plurality of supports.Type: ApplicationFiled: March 8, 2005Publication date: September 15, 2005Applicant: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi
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Publication number: 20050185120Abstract: The liquid crystal display device of the invention has a plurality of pixels, each including a first electrode 111, a second electrode 131 and a vertically aligned liquid crystal layer 120 interposed between the first and second electrodes. The first electrode has at least one opening 114 or cut 113 formed at a predetermined position in the pixel. At least one shading conductive layer 116 electrically connected to the first electrode is formed at least near the at least one opening or cut. In each of the plurality of pixels, a plurality of regions in which the directions of tilt of liquid crystal molecules are different from one another are formed when at least a predetermined voltage is applied across the liquid crystal layer.Type: ApplicationFiled: February 22, 2005Publication date: August 25, 2005Applicant: SHARP KABUSHIKI KAISHAInventors: Tsunanori Kitoh, Takeshi Kawahara, Kazuhiko Tamai, Noriaki Onishi, Yasuhiro Kume, Takaaki Okamoto
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Publication number: 20050162589Abstract: The liquid crystal display device includes a first substrate, a second substrate opposed to the first substrate, and a vertically aligned liquid crystal layer interposed between the first and second substrates, and has a plurality of pixels arranged in a matrix having rows and columns. Each pixel includes a first electrode formed on the first substrate, a second electrode formed on the second substrate, and the liquid crystal layer interposed between the first and second electrodes. The first substrate has a shading region in gaps between the plurality of pixels, and a wall structure is placed regularly on the surface of the first substrate facing the liquid crystal layer in the shading region. The first and second electrodes have at least one opening formed at a predetermined position in the pixel.Type: ApplicationFiled: December 23, 2004Publication date: July 28, 2005Applicant: SHARP KABUSHIKI KAISHAInventors: Yasuhiro Kume, Kazuhiko Tamai, Nobukazu Nagae, Noriaki Onishi
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Publication number: 20050140916Abstract: The liquid crystal display device includes a first substrate 1110a, a second substrate 1110b placed to face the first substrate, and a liquid crystal layer 1120 interposed between the first substrate and the second substrate. The liquid crystal display device has a plurality of pixels each including a first electrode 1111 formed on the first substrate, a second electrode 1131 formed on the second substrate, and the liquid crystal layer interposed between the first electrode and the second electrode. The second electrode 1131 has at least one opening 1114 formed at a predetermined position in the pixel, the first substrate has a shading region in gaps between the plurality of pixels, and a wall structure 1115 is placed regularly on the surface of the first substrate facing the liquid crystal layer in the shading region.Type: ApplicationFiled: December 7, 2004Publication date: June 30, 2005Applicant: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi, Takashi Kurihara
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Publication number: 20050117108Abstract: A liquid crystal display device including a first substrate 110a, a second substrate 110b placed to face the first substrate, a liquid crystal layer 120 interposed between the first and second substrates, a first electrode 111 formed on the first substrate, a second electrode 131 formed on the second substrate, an interlayer insulating film 115a placed between the first electrode and the first substrate, and a wall structure 115b formed integrally with the interlayer insulating film. The liquid crystal display device has a plurality of pixels each including the first electrode, the second electrode and the liquid crystal layer interposed between the first and second electrodes. A shading region surrounds each of the plurality of pixels, and the wall structure is placed regularly in the shading region. A groove structure 415a may be formed in place of the wall structure.Type: ApplicationFiled: November 4, 2004Publication date: June 2, 2005Applicant: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Noriaki Onishi, Kazuhiko Tamai, Nobukazu Nagae, Hiroaki Kojima, Takashi Kurihara, Nobuaki Yamada
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Publication number: 20050105016Abstract: The invention provides an image shifting device including at least one image shifting part for periodically shifting the position of an optical axis. The image shifting part includes a liquid crystal device 10 for switching a polarization direction of light between two orthogonal directions in accordance with High/Low level of an applied voltage, and a birefringent device 11 having different refractive indexes depending upon the polarization direction of the light. The liquid crystal device 10 and the birefringent device 11 are disposed to transmit light in this order. A liquid crystal layer included in the liquid crystal device 10 is made of a TN liquid crystal layer that satisfies a relationship formula of 0.25<d/p<1, wherein a natural pitch length is indicated by p and a cell gap is indicated by d, and is disposed to be twisted at 90° within the liquid crystal cell.Type: ApplicationFiled: November 28, 2002Publication date: May 19, 2005Applicant: Sharp Kabushiki KaishaInventors: Takashi Kurihara, Yasuhiro Kume, Hiroshi Nakanishi, Kazuhiko Tamai
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Publication number: 20050068482Abstract: A liquid crystal display apparatus includes a first substrate; a second substrate provided so as to face the first substrate; a vertical alignment type liquid crystal layer provided between the first substrate and the second substrate; a plurality of pixel areas each including a first electrode provided on the first substrate, a second electrode provided on the second substrate, and the liquid crystal layer provided between the first electrode and the second electrode; and a wall structure regularly arranged on a surface of the first electrode closer to the liquid crystal layer. The liquid crystal layer, when being provided with at least a prescribed voltage, forms at least one liquid crystal domain exhibiting a radially inclined orientation in an area substantially surrounded by the wall structure.Type: ApplicationFiled: September 29, 2004Publication date: March 31, 2005Applicant: Sharp Kabushiki KaishaInventors: Yasuhiro Kume, Nobukazu Nagae, Kazuhiko Tamai, Noriaki Onishi, Takaaki Okamoto