Patents by Inventor Kazuhiko Tsuda

Kazuhiko Tsuda 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: 8262382
    Abstract: A stamper, used for fabricating an antireflective member, has an uneven surface pattern, which includes a plurality of very small recessed portions, each having a stepped side surface.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: September 11, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tokio Taguchi, Shun Ueki, Kozo Nakamura, Kazuhiko Tsuda
  • Publication number: 20120008213
    Abstract: A display device and an optical film are disclosed which can protect the moth-eye structure while maintaining low reflectance. In at least one example embodiment, the present invention relates to a display device comprising an anti-reflection film including a moth-eye structure and a peelable protective film, wherein the protective film covers the moth-eye structure and is attached to a flat portion of the display device, the flat portion being flatter than the moth-eye structure. The flat portion suitably corresponds to the substrate and/or a region free of the moth-eye structure on the anti-reflection film, in a display panel.
    Type: Application
    Filed: March 29, 2010
    Publication date: January 12, 2012
    Inventors: Kazuhiko Tsuda, Takao Imaoku
  • Publication number: 20110315557
    Abstract: A method of fabricating a motheye mold according to the present invention includes the steps of: (a) anodizing a surface of an aluminum film (10a) via an electrode (32a) that is in contact with the surface, thereby forming a porous alumina layer which has a plurality of very small recessed portions; (b) after step (a), allowing the porous alumina layer to be in contact with an etchant, thereby enlarging the very small recessed portions of the porous alumina layer; and (c) after step (b), further anodizing the surface to grow the plurality of very small recessed portions. The aluminum film is made of aluminum with a purity of 99.99 mass % or higher. The electrode includes a first electrode portion (32a1) which is made of aluminum with a purity of 99.50 mass % or lower and a second electrode portion (32a2) which is made of aluminum with a higher purity than the aluminum of the first electrode portion and which is interposed between the surface and the first electrode portion.
    Type: Application
    Filed: March 2, 2010
    Publication date: December 29, 2011
    Inventors: Hidekazu Hayashi, Tokio Taguchi, Kazuhiko Tsuda
  • Publication number: 20110267317
    Abstract: A liquid crystal display unit (100) of the present invention includes a liquid crystal panel (20) in which an optical sensor for detecting the intensity of light entered from a front side thereof is incorporated, a backlight (10) that emits light onto the liquid crystal panel (20) from a rear side, and a polarizing reflection plate (50) that is disposed between the liquid crystal panel (20) and a front side polarizing plate (40a) so as to transmit a component of light emitted from the backlight (10) and transmitted through the liquid crystal panel (20) that oscillates in a direction parallel to the transmission axis of the front side polarizing plate (40a), and to reflect a component of the light that oscillates in a direction perpendicular to the transmission axis.
    Type: Application
    Filed: October 16, 2009
    Publication date: November 3, 2011
    Applicant: SHARP KABUSHIKI KAISHA
    Inventor: Kazuhiko Tsuda
  • Patent number: 7999893
    Abstract: The present invention provides a complex birefringent medium, which has the so-called inverse wavelength dispersibility, that is, a wavelength dispersibility capable of giving an optimum phase difference to a light of a wide visible wavelength range, has a wide viewing angle, can be produced by a convenient method and is excellent in a degree of adjusting freedom of inverse wavelength dispersibility and in mass productivity, a polarizing plate and a liquid crystal display device.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: August 16, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akira Sakai, Takayuki Natsume, Masahiro Hasegawa, Kazuhiko Tsuda, Nobuaki Yamada
  • Publication number: 20110164210
    Abstract: The present invention provides a display device which can reduce reflected light reflected on the respective surfaces of a display panel and a protective plate, even if the protective plate is disposed on the surface of the display panel, without employing a complicated structure and without degrading display quality. The display device includes: a display panel; and a protective plate disposed facing the display panel. The protective plate has a protective base material and a first polarizer, the display panel has a second polarizer of which a polarization axis is parallel to that of the first polarizer, and light passing between the first polarizer and the second polarizer is linearly polarized light.
    Type: Application
    Filed: August 26, 2009
    Publication date: July 7, 2011
    Inventor: Kazuhiko Tsuda
  • Publication number: 20110123777
    Abstract: The present invention provides an anti-reflective film that prevents wavelength dispersion from being applied to light transmitted through an anti-reflective film. The present invention is an anti-reflective film, which reduces reflection of visible light on a surface of a substrate by being mounted on the substrate, has a wavelength dispersion structure for applying first wavelength dispersion to visible light transmitting through the anti-reflective film, and contains a wavelength dispersion material for applying second wavelength dispersion to the visible light transmitting through the anti-reflective film, wherein visible light transmitted through the anti-reflective film has flat transmission wavelength dispersion in a visible light region.
    Type: Application
    Filed: September 1, 2009
    Publication date: May 26, 2011
    Inventors: Takao Imaoku, Tokio Taguchi, Akiyoshi Fujii, Kazuhiko Tsuda
  • Publication number: 20110090433
    Abstract: A TN liquid crystal display device (1) includes a polarizing plate (4a), a liquid crystal panel (100), and a polarizing plate (4b) in an order from a viewer side, in which absorption axes (4? and 4?) of the polarizing plates (4a and 4b) are set to be at an angle of approximately 45 degrees to respective rubbing directions (6a and 6b) of a first substrate (2a) and a second substrate (2b), and the absorption axes (4? and 4?) are arranged so as to be perpendicular to each other. Further, for example, a biaxial phase plate (5a) is provided at least between the substrate (2a) and the polarizing plate (4a) so that an in-plane slow axis (5?) is set to be at an angle of approximately 90 degrees to the absorption axis (4?) of the polarizing plate (4a). This configuration makes it possible to realize, at a low cost, a technique to concurrently improve (i) a viewing angle display characteristic and (ii) use efficiency of material members of the TN display liquid crystal display device.
    Type: Application
    Filed: April 7, 2009
    Publication date: April 21, 2011
    Inventors: Kazuyoshi Sakuragi, Nobuaki Yamada, Kazuhiko Tsuda, Akira Sakai
  • Publication number: 20110085101
    Abstract: A liquid crystal display device comprises plural picture elements including a first picture element and a second picture element; plural switching elements; and plural scanning lines. The plural switching elements include a first switching element electrically connected to the first picture element and a second switching element electrically connected to the second picture element. The plural scanning lines include a first scanning line electrically connected to the first switching element and a second scanning line electrically connected to the second switching element. The second scanning line is located between at least part of the first picture element and the first scanning line. The first scanning line is located between at least part of the second picture element and the second scanning line.
    Type: Application
    Filed: December 16, 2010
    Publication date: April 14, 2011
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Tokio TAGUCHI, Kazuhiko Tsuda, Mutsumi Nakajima, Keisuke Yoshida, Junichi Yamada
  • Patent number: 7924276
    Abstract: A liquid crystal panel (2) includes scanning signal lines (31) for supplying scanning signals to gate electrodes (20) of TFTs (14), and data signal lines (32) for supplying data signals to data electrodes (24) of TFTs. The liquid crystal panel further includes auxiliary capacitive electrode pads (27a) for use in forming auxiliary capacitance and an auxiliary capacitive lines (33) so as not to generate a capacitive bond with the scanning signal lines. The liquid crystal panel is driven at a rewriting frequency of a screen of not more than 30 Hz. As a result, the liquid crystal panel can be driven at a low consumption power while maintaining a desirable display quality of the liquid crystal panel.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: April 12, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuhiko Tsuda, Masahiro Shimizu, Hisakazu Nakamura, Kouji Kumada, Takashige Ohta, Yutaka Kamezaki, Hitoshi Kamezaki, legal representative, Masano Kamezaki, legal representative
  • Patent number: 7903206
    Abstract: An opposed substrate has a configuration in which a retardation film and a polarizer are provided outside a glass substrate, and a color filter is provided inside the glass substrate. The color filter selects a color of light passing through the color filter itself. The color filter has a color reproduction range of 0.079 or more both in a reflection area and in a transmission area. It is preferable that color filters are formed of the same color material and have almost the same thickness in a reflection area and a transmission area. That is, it is preferable that one pixel area has the same configuration in the reflection area as in the transmission area.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: March 8, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kozo Nakamura, Shun Ueki, Tokio Taguchi, Kazuhiko Tsuda
  • Publication number: 20110051061
    Abstract: The present invention provides a transflective liquid crystal display device which is produced by a simple process with minimum increase in the production cost and which achieves both high-quality reflective display and transmissive display. The present invention relates to a vertical alignment transflective liquid crystal display device for transmissive display and reflective display. The display device includes: a back-side polarizer; a liquid crystal cell; a viewing-side polarizer; a first retardation layer; and a second retardation layer. The liquid crystal cell includes a pair of substrates and a liquid crystal layer disposed between the pair of substrates. The viewing-side polarizer has an absorption axis orthogonal to an absorption axis of the back-side polarizer. The first retardation layer is disposed between the liquid crystal layer and the viewing-side polarizer at a transmissive display region and a reflective display region, satisfies 1.5?Nz?9.
    Type: Application
    Filed: September 25, 2008
    Publication date: March 3, 2011
    Inventors: Akira Sakai, Kazuhiko Tsuda
  • Publication number: 20110037914
    Abstract: A liquid crystal display device includes: pixel electrodes arranged in columns and rows, each including a reflective electrode region; scanning lines; and signal lines. The device sequentially supplies a scanning signal voltage to one of the scanning lines after another to select one group of pixel electrodes, connected to the same one of the scanning lines, after another, and then supplies display signal voltages to the selected group of pixel electrodes by way of the signal lines, thereby displaying an image thereon. The pixel electrodes are arranged such that the polarity of a voltage to be applied to a liquid crystal layer is inverted for every predetermined number of pixel electrodes in each of the rows and in each of the columns. The display signal voltage to be supplied to each pixel electrode is updated at a frequency of 45 Hz or less.
    Type: Application
    Filed: October 21, 2010
    Publication date: February 17, 2011
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Noboru NOGUCHI, Hisashi NAGATA, Toshihiro MATSUMOTO, Kazuhiko TSUDA, Makoto KANBE, Akihiko KOJIMA
  • Patent number: 7880834
    Abstract: Realizes a structure for a transreflective liquid crystal display device in which one pixel is defined by four or more picture elements, the structure providing a high aperture ratio and being suitable for display for which the transmission mode is prioritized. A liquid crystal display device according to the present invention is a transreflective liquid crystal display device, comprising a plurality of picture elements including a first picture element, a second picture element, a third picture element and a fourth picture element for displaying different colors from one another; in which each of the plurality of picture elements includes a transmission area for providing display in a transmission mode and a reflection area for providing display in a reflection mode. Each picture element includes a mesh portion shaped to be meshable with an adjacent picture element; and the reflection area of each picture element is located in the mesh portion.
    Type: Grant
    Filed: February 19, 2007
    Date of Patent: February 1, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tokio Taguchi, Kazuhiko Tsuda, Mutsumi Nakajima, Keisuke Yoshida, Junichi Yamada
  • Publication number: 20110001912
    Abstract: A display device of at least one embodiment of the present invention includes a display panel; an optical plate placed on a viewer side of the display panel with the intervention of an air layer; and an antireflection layer placed on a viewer side of the optical plate, the antireflection layer having a motheye structure over its surface. The optical plate includes a plastic layer configured to transmit visible light, a quarter-wave layer placed on a viewer side of the plastic layer, and a polarizing layer placed on a viewer side of the quarter-wave layer, the polarizing layer being configured to transmit a linear polarization. The display device is more suitable to mobile applications than the conventional devices.
    Type: Application
    Filed: February 20, 2009
    Publication date: January 6, 2011
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Ikuo Ninomiya, Nobuaki Yamada, Kazuhiko Tsuda, Akira Sakai
  • Publication number: 20110003121
    Abstract: A reflection-preventing film is disclosed, which reduces reflection of light on the surface of a display device and reduces the influence of light reflecting inside the display device. The reflection-preventing film of at least one embodiment of the present invention is a reflection-preventing film having on its surface a fine uneven structure in which a width between adjacent top points is equal to or less than a visible wavelength, wherein a half-value angle of transmission scattering intensity distribution of light transmitted through overlapped two sheets of the reflection-preventing film is 1.0° or more.
    Type: Application
    Filed: February 4, 2009
    Publication date: January 6, 2011
    Inventor: Kazuhiko Tsuda
  • Patent number: 7843533
    Abstract: A liquid crystal display device includes: pixel electrodes arranged in columns and rows, each including a reflective electrode region; scanning lines; and signal lines. The device sequentially supplies a scanning signal voltage to one of the scanning lines after another to select one group of pixel electrodes, connected to the same one of the scanning lines, after another, and then supplies display signal voltages to the selected group of pixel electrodes by way of the signal lines, thereby displaying an image thereon. The pixel electrodes are arranged such that the polarity of a voltage to be applied to a liquid crystal layer is inverted for every predetermined number of pixel electrodes in each of the rows and in each of the columns. The display signal voltage to be supplied to each pixel electrode is updated at a frequency of 45 Hz or less.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: November 30, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Noboru Noguchi, Hisashi Nagata, Toshihiro Matsumoto, Kazuhiko Tsuda, Makoto Kanbe, Akihiko Kojima
  • Publication number: 20100291317
    Abstract: A method is disclosed for efficiently producing a nanoimprint film with high-accurately formed nanostructures even if a base on which the nanoimprint film is formed is capable of absorbing UV light. The production method of at least one embodiment of the present invention is a production method of a nanoimprint film formed on a base, the nanoimprint film having a surface with nanosized protrusions and recesses formed thereon. In at least one embodiment, the production method includes a first step of applying a UV-curable resin on a base containing a UV-absorbing component to form a film; a second step of irradiating the film with UV light from a top-side surface of the film to form a semi-cured film; a third step of imprinting nanosized protrusions and recesses on the semi-cured film to form a film having a surface with protrusions and recesses formed thereon; and a fourth step of curing the film with protrusions and recesses to form a nanoimprint film.
    Type: Application
    Filed: November 7, 2008
    Publication date: November 18, 2010
    Inventors: Takao Imaoku, Tokio Taguchi, Hidekazu Hayashi, Kazuhiko Tsuda
  • Patent number: 7835080
    Abstract: An antireflective member has an uneven surface pattern, in which unit structures are arranged in x and y directions at respective periods that are both shorter than the shortest wavelength of an incoming light ray, on the surface of a substrate and satisfies the following Inequality (1): ? ? ? x , y ? min < 1 ni + ni · sin ? ? ? ? ? i max ( 1 ) where ?min is the shortest wavelength of the incoming light ray, ?imax is the largest angle of incidence of the incoming light ray, ni is the refractive index of an incidence medium, ?x is the period of the uneven surface pattern in the x direction, and ?y is the period of the pattern in the y direction. As a result, diffraction of short-wave light components can be reduced in a broad wavelength range.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: November 16, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tokio Taguchi, Shun Ueki, Kozo Nakamura, Kazuhiko Tsuda
  • Publication number: 20090257005
    Abstract: The inventive liquid crystal device is driven in circular polarization mode. A protection plate (22) is provided with a first optical member where a first polarizing plate (23) and a first wave plate (24) are laid in layers sequentially in the order of the first phase difference plate and the first polarizing plate from the side close to a liquid crystal display panel. Optical conditions of the first optical member are designed such that the incident light from the observer side becomes elliptically polarized light having an ellipticity of 0.4-1.0 when it passed through the protection plate and the first optical member and the elliptically polarized light impinges on the liquid crystal layer. Consequently, surface reflection on each substrate and film in the liquid crystal display can be reduced effectively.
    Type: Application
    Filed: September 20, 2006
    Publication date: October 15, 2009
    Inventors: Hiroyuki Kamee, Yozo Narutaki, Kazuhiko Tsuda