Patents by Inventor Takehisa Sakurai

Takehisa Sakurai 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).

  • Patent number: 8284359
    Abstract: A liquid crystal panel (2) includes a pair of substrates (10, 20) and a liquid crystal layer (30) sandwiched between the substrates (10, 20). At least one of the substrate (10, 20) is provided with combtooth electrodes (12, 13). The liquid crystal layer (30) is driven by a transverse electric field generated between the combtooth electrodes (12, 13). The liquid crystal layer (30) contains liquid crystal molecules (31) that align themselves perpendicularly to surfaces of the substrates when no electric field is applied. The liquid crystal panel 2 satisfies 0.33?S/(S+L)?0.64, where L is the width of each of the combtooth electrodes (12, 13) and S is the electrode interval.
    Type: Grant
    Filed: March 17, 2010
    Date of Patent: October 9, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Mitsuhiro Murata, Shoichi Ishihara, Shuichi Kozaki, Takehisa Sakurai, Tadashi Ohtake, Masako Nakamura
  • Publication number: 20120234584
    Abstract: It is an object of the invention to provide a method for producing a substrate for mounting a semiconductor chip, that can reduce bridging and allows excellent wire bondability and solder connection reliability to be obtained, even when forming fine-pitch wirings.
    Type: Application
    Filed: September 6, 2010
    Publication date: September 20, 2012
    Applicant: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Yoshinori Ejiri, Kiyoshi Hasegawa, Takehisa Sakurai, Yoshiaki Tsubomatsu
  • Publication number: 20120182511
    Abstract: The present invention provides a liquid crystal display device that adopts a TBA mode that can suppress the occurrence of unevenness of luminance. The liquid crystal display device includes a pair of substrates disposed facing each other, and a liquid crystal layer sandwiched between the pair of substrates. One of the pair of substrates has a pair of comb-tooth-shaped electrodes. The pair of electrodes are disposed to planarly face each other in a pixel, and are formed by patterning the same layer. The liquid crystal layer includes p-type nematic liquid crystal, and is driven by an electric field generated between the pair of electrodes. The p-type nematic liquid crystal is vertically aligned with respect to the surfaces of the pair of substrates when no voltage is applied. A spacing between the pair of electrodes varies in a longitudinal direction of the pair of electrodes.
    Type: Application
    Filed: May 10, 2010
    Publication date: July 19, 2012
    Inventors: Yuhko Hisada, Takehisa Sakurai, Mitsuhiro Murata, Tsuyoshi Okazaki, Katsuhiko Morishita
  • Publication number: 20120182503
    Abstract: A liquid crystal display element of the present invention is a vertical alignment type liquid crystal display element (10) comprising an array substrate (22), a counter substrate (24), and a liquid crystal layer (50), which carries out a display by controlling orientations of liquid crystal molecules (52) in the liquid crystal layer (50) by use of transverse electric fields (60). In the liquid crystal display element (10), projections (70) are provided in positions corresponding to boundaries (V1, V2, V3) of orientational regions in the liquid crystal layer (50), on a liquid crystal layer (50) side surface of the counter substrate (24). Each of the protrusions (70) has a taper shape.
    Type: Application
    Filed: March 9, 2010
    Publication date: July 19, 2012
    Inventors: Mitsuhiro Murata, Shuichi Kozaki, Shoichi Ishihara, Takehisa Sakurai, Tadashi Ohtake, Masako Nakamura
  • Publication number: 20120182512
    Abstract: This invention provides a liquid crystal display device in which response characteristics of liquid crystal molecules are improved. The liquid crystal display device includes a pair of substrates that are disposed facing each other, and a liquid crystal layer that is sandwiched between the pair of substrates. The liquid crystal layer contains liquid crystal molecules having positive dielectric anisotropy. The liquid crystal molecules align in a vertical direction relative to surfaces of the pair of substrates in a state in which a voltage is not applied thereto. The pair of substrates includes two or more sets of comb-shaped electrode pairs in which comb tooth portions of each comb-shaped electrode are alternately disposed with each other with a certain space therebetween. One substrate of the pair of substrates comprises a first polarizer. The other substrate of the pair of substrates comprises a second polarizer.
    Type: Application
    Filed: March 9, 2010
    Publication date: July 19, 2012
    Inventors: Takehisa Sakurai, Shoichi Ishihara, Shuichi Kozaki, Mitsuhiro Murata, Tadashi Ohtake
  • Publication number: 20120169981
    Abstract: A vertical alignment liquid crystal panel based on a transverse electric field drive system is provided which shows few changes in color when looked squarely at. A liquid crystal panel (2) is a vertical alignment liquid crystal panel based on a transverse electric field drive system, which carries out a display by driving, with a transverse electric field, a liquid crystal layer (50) sandwiched between substrates (10, 20), and the substrate (10) is provided with an insulating layer (25) having at least two regions that are different in relative permittivity from each other in a pixel (6) composed of a red subpixel (6R), a green subpixel (6G), and a blue subpixel (6B). Those regions of the insulating layer (25) which correspond to the blue, green, and red subpixel (6B, 6G, 6R) in the liquid crystal panel (2) have relative permittivities of 3, 3 to 7, and 4 to 7, respectively.
    Type: Application
    Filed: June 8, 2010
    Publication date: July 5, 2012
    Inventors: Mitsuhiro Murata, Shuichi Kozaki, Shoichi Ishihara, Takehisa Sakurai, Tadashi Ohtake
  • Publication number: 20120154368
    Abstract: Picture element electrodes (30) and common electrodes (36) are provided in one of two substrates facing each other. Each picture element (20) has a plurality of sub picture elements (22). In a range in which a signal voltage of an image signal is low, a display is carried out only in a first sub picture element (22a) having narrower electrode spacing, whereas in a range in which the signal voltage of the image signal is high, a display is carried out in both of the first sub picture element (22a) and a second sub picture element (22b) having wider electrode spacing.
    Type: Application
    Filed: March 10, 2010
    Publication date: June 21, 2012
    Inventors: Takehisa Sakurai, Shuichi Kozaki, Shoichi Ishihara, Masako Nakamura, Mitsuhiro Murata, Tadashi Ohtake
  • Publication number: 20120154730
    Abstract: The present invention provides a liquid crystal display device having an improved aperture ratio.
    Type: Application
    Filed: March 8, 2010
    Publication date: June 21, 2012
    Inventors: Takehisa Sakurai, Mitsuhiro Murata, Tadashi Ohtake, Shoichi Ishihara, Shuichi Kozaki, Yuhko Hisada
  • Patent number: 8199299
    Abstract: A liquid crystal panel (10) includes a liquid crystal layer formed with a p-type liquid crystal. The liquid crystal layer exhibits homogeneous orientation while no voltage is applied. Further, an electric field is applied to the liquid crystal layer in a direction same as dipole moments (?) of liquid crystal molecules (3a) to which no voltage is applied. With these arrangements, it is possible to provide a liquid crystal panel and a liquid crystal display device, each of which adopts a new display mode that can achieve a wide viewing angle equivalent to an IPS mode, can achieve a high-speed response like an OCB mode or exceeding the OCB mode, and does not require an initial operation for orientation conversion to the bend orientation.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: June 12, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shoichi Ishihara, Takehisa Sakurai, Shuichi Kozaki
  • Publication number: 20120127417
    Abstract: The present invention provides a liquid crystal display device providing uniform display without lowering the transmissivity.
    Type: Application
    Filed: March 8, 2010
    Publication date: May 24, 2012
    Inventors: Takehisa Sakurai, Mitsuhiro Murata, Shoichi Ishihara, Shuichi Kozaki, Masako Nakamura, Tadashi Ohtake
  • Publication number: 20120120363
    Abstract: The present invention provides a liquid crystal display element that can be driven at a low threshold voltage. A liquid crystal display element of the present invention includes: a pair of substrates; and a liquid crystal layer sealed between the pair of substrates, wherein the liquid crystal layer contains liquid crystal molecules that are aligned perpendicularly to at least one substrate face of the pair of substrates when a voltage is applied, the at least one of the pair of substrates comprises a pair of comb-shaped electrodes, the at least one of the pair of substrates comprises a polymer film on a face contacting the liquid crystal layer, and the polymer film is made of a polymer material having a CF2 bond.
    Type: Application
    Filed: March 8, 2010
    Publication date: May 17, 2012
    Inventors: Shoichi Ishihara, Mitsuhiro Murata, Takehisa Sakurai, Tadashi Ohtake, Shuichi Kozaki
  • Publication number: 20120013594
    Abstract: A liquid crystal panel (2) includes: a p-type liquid crystal material sandwiched between a pair of substrates (40, 20); and pixel electrodes (13), each formed from a comb electrode, and a common electrode (14) both provided to the substrate (40). A p-type liquid crystal material is aligned in a direction perpendicular to substrate surfaces while no electric field is applied. The comb electrodes each have an electrode width of not more than 5 ?m and an electrode spacing of not more than 15 ?m. The pixel electrode (13) and the common electrode (14) serve to apply to the p-type liquid crystal material an electric field parallel to the substrate surface. A voltage of not less than 7 V is applied between the pixel electrode (13) and the common electrode (14) when the liquid crystal panel is driven. The p-type liquid crystal material has, in a range from 0.9 to 2.5, a product of a dielectric anisotropy ?? and a refractive index anisotropy ?n.
    Type: Application
    Filed: March 11, 2010
    Publication date: January 19, 2012
    Inventors: Shoichi Ishihara, Mitsuhiro Murata, Takehisa Sakurai, Tadashi Ohtake, Shuichi Kozaki
  • Publication number: 20120008074
    Abstract: A liquid crystal panel (2) includes: a pair of substrates (10, 20) which face each other; a liquid crystal layer (30) sandwiched by the pair of substrates (10, 20); and an upper electrode (14) and a lower electrode (12) which are provided on one surface (10) of the pair of substrates (10, 20) and overlap each other via an insulating layer (13), the upper electrode (14) being constituted by comb electrodes (14A, 14B), an average electrical energy being not less than 0.44 J/m3 in a part of the liquid crystal layer which part is 0.1 ?m deep from a surface of the other one (20) of the pair of substrates (10, 20) and which part overlaps the comb electrodes (14A, 14B) when the liquid crystal layer (30) is viewed from a direction vertical to a substrate surface.
    Type: Application
    Filed: April 27, 2010
    Publication date: January 12, 2012
    Inventors: Mitsuhiro Murata, Shuichi Kozaki, Shoichi Ishihara, Takehisa Sakurai, Tadashi Ohtake, Masako Nakamura
  • Publication number: 20110316843
    Abstract: A liquid crystal display element, a liquid crystal display device, and a method for displaying with a liquid crystal display element, wherein picture element electrodes (30) and a common electrode (36) are provided, each of a plurality of sub-picture elements (22) is provided with the common electrode (36) and a corresponding one of the picture element electrodes (30) in such a manner that the sub-picture elements (22) have different distances (a first distance d1 and a second distance d2) between the common electrode (36) and their corresponding ones of the picture element electrodes (30), display in a low gray scale region is carried out by means of a first sub-picture element (22a) that is a sub-picture element (22) in which the distance is short, display in a middle gray scale region is carried out by means of a second sub-picture element (22b) that is a sub-picture element (22) in which the distance is long, and display in a high gray scale region is carried out by means of the first sub-picture element
    Type: Application
    Filed: March 2, 2010
    Publication date: December 29, 2011
    Inventors: Takehisa Sakurai, Shuichi Kozaki, Shoichi Ishihara, Masako Nakamura, Mitsuhiro Murata, Tadashi Ohtake
  • Publication number: 20110310337
    Abstract: The present invention provides a liquid crystal display device that can suppress a display defect due to collapse of liquid crystal alignment. The present invention provides a liquid crystal display device comprising a liquid crystal display element including a pair of substrates and a liquid crystal layer hermetically interposed between the pair of substrates, wherein the liquid crystal layer includes a p-type liquid crystal material that is homeotropically aligned with respect to surfaces of the pair of substrates when no voltage is applied; one of the pair of substrates comprises a comb-shaped electrode and a first alignment layer configured to control alignment of the p-type liquid crystal material; the other of the pair of substrates comprises a second alignment layer configured to control alignment of the p-type liquid crystal material; and the first alignment layer has an anchoring energy of not greater than 1.5×10?4 J/m2.
    Type: Application
    Filed: March 17, 2010
    Publication date: December 22, 2011
    Inventors: Shoichi Ishihara, Takehisa Sakurai, Mitsuhiro Murata, Shuichi Kozaki, Tadashi Ohtake
  • Publication number: 20110304797
    Abstract: The present invention provides a liquid crystal display device that suppress moiré generated when a voltage is applied in a liquid crystal mode that drives a vertical alignment liquid crystal by using at least a pair of comb-shaped electrodes.
    Type: Application
    Filed: March 8, 2010
    Publication date: December 15, 2011
    Inventors: Mitsuhiro Murata, Shoichi Ishihara, Shuichi Kozaki, Takehisa Sakurai, Masako Nakamura, Tadashi Ohtake
  • Publication number: 20110304528
    Abstract: The present invention provides a liquid crystal display device in which viewing angle characteristics are improved without impairing transmittance.
    Type: Application
    Filed: March 8, 2010
    Publication date: December 15, 2011
    Inventors: Mitsuhiro Murata, Shoichi Ishihara, Shuichi Kozaki, Takehisa Sakurai, Tadashi Ohtake
  • Publication number: 20110279762
    Abstract: An vertical alignment type liquid crystal display element (10) which controls an orientation of liquid crystal molecules (52) in a liquid crystal layer (50) by use of a transverse electric field so as to carry out display. A CF-side first insulating layer (42a) and a CF-side second insulting layer (42b) which have respective different dielectric constants are provided, within a pixel in a planar view, on or above a CF substrate (24) so that a first electric field region (60) and a second electric field region (62) which differ in shapes of equipotential lines are formed in the pixel due to generation of a transverse electric field.
    Type: Application
    Filed: March 8, 2010
    Publication date: November 17, 2011
    Inventors: Mitsuhiro Murata, Shoichi Ishihara, Takehisa Sakurai, Shuichi Kozaki, Tadashi Ohtake
  • Patent number: 8054435
    Abstract: A liquid crystal panel includes: a p-type liquid crystal material sandwiched by a pair of substrates and comb-teeth shape electrodes for applying, to the p-type liquid crystal material, an electric field parallel to a substrate surface. The p-type liquid crystal material is aligned vertically with respect to the substrate surface at the time when no electric field is applied. The comb-teeth shape electrodes have an electrode width of 5 ?m or less, and an electrode spacing of 15 ?m or less. A product of a dielectric constant anisotropy ?? and a refractive index anisotropy ?n of the p-type liquid crystal material is 1.3 or more and 3.1 or less.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: November 8, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shoichi Ishihara, Takehisa Sakurai, Shuichi Kozaki
  • Publication number: 20110199570
    Abstract: A liquid crystal panel (2) includes a pair of substrates (10, 20) and a liquid crystal layer (30) sandwiched between the substrates (10, 20). At least one of the substrate (10, 20) is provided with combtooth electrodes (12, 13). The liquid crystal layer (30) is driven by a transverse electric field generated between the combtooth electrodes (12, 13). The liquid crystal layer (30) contains liquid crystal molecules (31) that align themselves perpendicularly to surfaces of the substrates when no electric field is applied. The liquid crystal panel 2 satisfies 0.33?S/(S+L)?0.64, where L is the width of each of the combtooth electrodes (12, 13) and S is the electrode interval.
    Type: Application
    Filed: March 17, 2010
    Publication date: August 18, 2011
    Inventors: Mitsuhiro Murata, Shoichi Ishihara, Shuichi Kozaki, Takehisa Sakurai, Tadashi Ohtake, Masako Nakamura