Patents by Inventor Yoshitaka Yamada
Yoshitaka Yamada 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: 20070075950Abstract: A liquid crystal display device has a gradation display function of at least an n-number of gray levels and has a viewing angle characteristic of Mi/Mj?1.3 in a case where a display luminance range in a normal direction to a display surface in a gradation range of predetermined gray levels i to j is Li to Lj and a display luminance range in an oblique viewing-angle direction of 30° or more is Mi to Mj (where n, i and j are real numbers, and n?i>j?0). The liquid crystal display device has a display mode in which a display image is displayed with a display luminance range of the display image being limited to Li to Lj.Type: ApplicationFiled: August 30, 2006Publication date: April 5, 2007Inventors: Yoshitaka YAMADA, Ryoichi Watanabe, Masaki Kinoshita, Yoshihiro Watanabe, Sadayasu Fujibayashi, Norihiro Yoshida
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Publication number: 20070024773Abstract: A liquid crystal display apparatus comprising a liquid crystal display panel and an optical unit. The liquid crystal display panel includes a first substrate, a second substrate, a plurality of pixel electrodes, and a plurality of projections. Each of the pixel electrodes has a major axis that is 160 ?m or less long. A value obtained by dividing a height of the projections by a gap d between the first and second substrates is 0.14 to 0.6. The projections are 15 ?m or less wide as measured in the first direction. The apparatus satisfied the relation of MIN (la, lb)/d<10.Type: ApplicationFiled: July 13, 2006Publication date: February 1, 2007Inventors: Yoshitaka Yamada, Arihiro Takeda, Norihiro Yoshida, Takashi Mitsumoto, Hirokazu Morimoto
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Patent number: 7098975Abstract: In order to reduce an occurrence of a double image, to improve a contrast ratio in transmissive display, and to widen a viewing angle, a light diffusion layer for restricting the occurrence of the double image is placed between a viewing angle compensating plate and a reflective layer. With this configuration, though traveling directions of light emitted from a backlight placed on an outside of the reflective layer are changed in the light diffusion layer, the traveling directions are not changed in the viewing angle compensating plate and a liquid crystal layer once the light is made incident onto the viewing angle compensating plate, and the light travels straight in any of the vertical direction and slanting directions. Thus, the viewing angle compensating plate can exert an original function thereof to compensate a phase difference and can ensure a viewing angle widely.Type: GrantFiled: February 16, 2005Date of Patent: August 29, 2006Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Yoshitaka Yamada
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Patent number: 7026078Abstract: First, a correction is made for correcting the mask pattern configuration of a photomask (3) used for exposure in accordance with the space between a mask pattern and an adjacent mask pattern thereto and a desired configuration to be transferred from the mask pattern. Second, a correction is made for dividing the photomask (3) into a plurality of mesh regions (M) to correct the pattern configuration of the photomask (3) in accordance with the occupation rate (R) of the mask pattern in each of the mesh regions (M).Type: GrantFiled: August 7, 2003Date of Patent: April 11, 2006Assignee: Renesas Technology Corp.Inventors: Hiroshi Kawashima, Yoshitaka Yamada
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Publication number: 20050280757Abstract: In order to reduce the number of processes for manufacturing spacers and to prevent quality degradation resulting from a cell gap, a spacer 115 in a semi-transmission area 12 is formed outside of a region of a bump layer 118B. Thus, it is made possible to manufacture the spacer in the transmission region 11 and the spacer outside of the region of the bump layer in the same process. Accordingly, the number of processes can be reduced. Moreover, it is made possible to determine the cell gap in the semi-transmission area 12 by a single element of a spacer. Accordingly, precision degradation of the cell gap, which results from the bump layer, can be prevented, and high display quality can be obtained.Type: ApplicationFiled: May 31, 2005Publication date: December 22, 2005Applicant: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Yoshitaka Yamada, Hirokazu Morimoto, Seiichi Sato, Hiroyuki Kimura, Tetsuya Iizuka
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Patent number: 6933995Abstract: An LCD device includes a transparent glass plate 122 and thin film transistor electrodes 124 formed on the glass plate 122. A photosensitive insulation film 128 is coated on the glass plate 122 and the thin film transistor electrodes 124. The insulation film 128 includes transparent and reflective regions 134 and 133 which are different in thickness. Light shielding films 126 are positioned underneath boundaries of the transparent and reflective regions 134 and 133. Where an optical exposure stage includes different reflection coefficient portions, the light shielding films 126 prevent light reflected by the exposure stage from reaching the insulation film thereby maintaining the accuracy of its patterning.Type: GrantFiled: July 21, 2003Date of Patent: August 23, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Sadayasu Fujibayashi, Atsuko Oono, Ryoichi Watanabe, Yoshitaka Yamada, Hirokazu Morimoto
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Publication number: 20050179837Abstract: In order to reduce an occurrence of a double image, to improve a contrast ratio in transmissive display, and to widen a viewing angle, a light diffusion layer for restricting the occurrence of the double image is placed between a viewing angle compensating plate and a reflective layer. With this configuration, though traveling directions of light emitted from a backlight placed on an outside of the reflective layer are changed in the light diffusion layer, the traveling directions are not changed in the viewing angle compensating plate and a liquid crystal layer once the light is made incident onto the viewing angle compensating plate, and the light travels straight in any of the vertical direction and slanting directions. Thus, the viewing angle compensating plate can exert an original function thereof to compensate a phase difference and can ensure a viewing angle widely.Type: ApplicationFiled: February 16, 2005Publication date: August 18, 2005Applicant: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Yoshitaka Yamada
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Publication number: 20050057704Abstract: A liquid crystal display device includes first and second electrode substrates, a liquid crystal layer which is held between the substrates and in which nematic liquid crystal molecules are arranged in substantially parallel to each of the substrates without distortion, first and second optical anisotropic elements respectively disposed on the substrates on the sides opposite to the liquid crystal layer, first and second half-wavelength plates respectively disposed on the optical anisotropic elements, and first and second polarizing plates respectively disposed on the half-wavelength plates. Particularly, the substrate includes a light transmitting section which permits backlight light from the polarizing plate side to transmit therethrough and a light reflecting section which reflects ambient light from the polarizing plate side and at least one of the optical anisotropic elements is formed of two retardation plates having a retardation in a plane.Type: ApplicationFiled: October 29, 2004Publication date: March 17, 2005Inventors: Toshiya Ootake, Yutaka Nakai, Yuko Kizu, Yoshitaka Yamada
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Patent number: 6831709Abstract: A liquid crystal display panel is arranged such that a reflection member overlaps a light-shielding wiring pattern such that apertures are left unmasked. This prevents light use efficiency from being decreased due to a light-shielding wiring pattern having memory wiring layers. An array substrate includes a transparent electrode which applies a field to a liquid crystal layer, a light-shielding wiring pattern having one or more apertures which allow transmission of light incident on the liquid crystal layer from the reverse side of the array substrate, and a reflection member which reflects incident light applied from a counter substrate side through the liquid crystal layer.Type: GrantFiled: February 27, 2002Date of Patent: December 14, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Yoshitaka Yamada, Yasuyuki Hanazawa
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Publication number: 20040180268Abstract: First, a correction is made for correcting the mask pattern configuration of a photomask (3) used for exposure in accordance with the space between a mask pattern and an adjacent mask pattern thereto and a desired configuration to be transferred from the mask pattern. Second, a correction is made for dividing the photomask (3) into a plurality of mesh regions (M) to correct the pattern configuration of the photomask (3) in accordance with the occupation rate (R) of the mask pattern in each of the mesh regions (M).Type: ApplicationFiled: August 7, 2003Publication date: September 16, 2004Applicant: Renesas Technology Corp.Inventors: Hiroshi Kawashima, Yoshitaka Yamada
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Patent number: 6753938Abstract: A liquid crystal display device comprises an array substrate including a plurality of pixel electrodes, a counter substrate including a counter electrode facing the pixel electrodes, and a liquid crystal layer which modulates reflected and transmitted light of each pixel held between the substrates and defined by a corresponding pixel electrode. In particular, each pixel electrode has a conductive light reflective layer which reflects incident light and at least one opening which is formed as a missing portion of the conductive light reflective film to transmit incident light.Type: GrantFiled: September 6, 2001Date of Patent: June 22, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Yoshitaka Yamada, Yasuyuki Hanazawa, Masaki Kinoshita, Akio Murayama, Yasuharu Tanaka, Ryoichi Watanabe
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Publication number: 20040105043Abstract: An LCD device includes a transparent glass plate 122 and thin film transistor electrodes 124 formed on the glass plate 122. A photosensitive insulation film 128 is coated on the glass plate 122 and the thin film transistor electrodes 124. The insulation film 128 includes transparent and reflective regions 134 and 133 which are different in thickness. Light shielding films 126 are positioned underneath boundaries of the transparent and reflective regions 134 and 133. Where an optical exposure stage includes different reflection coefficient portions, the light shielding films 126 prevent light reflected by the exposure stage from reaching the insulation film thereby maintaining the accuracy of its patterning.Type: ApplicationFiled: July 21, 2003Publication date: June 3, 2004Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Sadayasu Fujibayashi, Atsuko Oono, Ryoichi Watanabe, Yoshitaka Yamada, Hirokazu Morimoto
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Publication number: 20030117553Abstract: A liquid crystal display device is capable of preventing the picture quality from becoming poor in both transparent and reflective modes of operation. The liquid crystal display device 1 of the present invention includes first and second substrates 11 and 21 provided opposite to each other, a plurality of pixel electrodes 19 disposed on a surface of the first substrate 11 opposite to the second substrate 21, a common electrode 24 provided on a surface of the second substrate 21 opposite to the first substrate 11, a liquid crystal layer held between the first and second substrates 11 and 21, and the pixel electrodes 19 each having transparent and reflective portions 19a and 19b which are made of electrically conductive but optically reflective and transparent films 17 and 18, respectively, and are disposed in parallel.Type: ApplicationFiled: December 16, 2002Publication date: June 26, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Yoshitaka Yamada
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Publication number: 20020118327Abstract: A liquid crystal display panel is provided with a light-transmitting array substrate, a light-transmitting counter substrate, and a liquid crystal layer LQ held between the array and counter substrates and including liquid crystal molecules whose arrangement is controlled from the array and counter substrates. The array substrate includes a transparent electrode which applies an electric field to the liquid crystal layer, a light-shielding wiring pattern having one or more apertures which allow transmission of light incident on the liquid crystal layer from the reverse side of the array substrate, and a reflection member which reflects incident light applied from a counter substrate side through the liquid crystal layer. Particularly, the reflection member overlaps the light-shielding wiring pattern such that the one or more apertures are left unmasked.Type: ApplicationFiled: February 27, 2002Publication date: August 29, 2002Inventors: Yoshitaka Yamada, Yasuyuki Hanazawa
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Patent number: 6433848Abstract: A front surface of the opposite electrode of a liquid crystal display panel is formed in a curved shape. The relation between the reflecting surface of the pixel electrode and the curved surface of the opposite substrate is defined so that a leaving direction of the light that is reflected by the first face of the opposite substrate is different from a leaving direction of light that is emitted from the first face of the opposite substrate after having been reflected by the pixel electrodes through the liquid crystal layer. Thus, undesired light on the front surface of the opposite substrate is separated from light that is displayed. Consequently, an image free of dazzling and deterioration of contrast ratio due to undesired reflected light can be obtained with a high contrast ratio. In a display apparatus containing the reflection type liquid crystal display, an incident surface to a dichroic prism is an inclined surface including a curved surface, not a surface that is perpendicular to the optical axis.Type: GrantFiled: April 5, 2000Date of Patent: August 13, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Hiroki Nakamura, Masato Kemmochi, Yoshitaka Yamada, Yoshihiro Watanabe, Michiya Kobayashi, Nozomu Harada
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Publication number: 20020027627Abstract: A liquid crystal display device comprises an array substrate including a plurality of pixel electrodes, a counter substrate including a counter electrode facing the pixel electrodes, and a liquid crystal layer which modulates reflected and transmitted light of each pixel held between the substrates and defined by a corresponding pixel electrode. In particular, each pixel electrode has a conductive light reflective layer which reflects incident light and at least one opening which is formed as a missing portion of the conductive light reflective film to transmit incident light.Type: ApplicationFiled: September 6, 2001Publication date: March 7, 2002Inventors: Yoshitaka Yamada, Yasuyuki Hanazawa, Masaki Kinoshita, Akio Murayama, Yasuharu Tanaka, Ryoichi Watanabe
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Patent number: 6124911Abstract: A front surface of the opposite electrode of a liquid crystal display panel is formed in a curved shape. The relation between the reflecting surface of the pixel electrode and the curved surface of the opposite substrate is defined so that a leaving direction of the light that is reflected by the first face of the opposite substrate is different from a leaving direction of light that is emitted from the first face of the opposite substrate after having been reflected by the pixel electrodes through the liquid crystal layer. Thus, undesired light on the front surface of the opposite substrate is separated from light that is displayed. Consequently, an image free of dazzling and deterioration of contrast ratio due to undesired reflected light can be obtained with a high contrast ratio. In a display apparatus containing the reflection type liquid crystal display, an incident surface to a dichroic prism is an inclined surface including a curved surface, not a surface that is perpendicular to the optical axis.Type: GrantFiled: April 10, 1997Date of Patent: September 26, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Hiroki Nakamura, Masato Kemmochi, Yoshitaka Yamada, Yoshihiro Watanabe, Michiya Kobayashi, Nozomu Harada
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Patent number: 5721963Abstract: A camera including a photographing lens and a finder to provide a viewing image field through which an object can be observed. The field ratio of the viewfinder field to the photographed image field on the film is 87% to 120% and the exposure value of the camera is 11 to 13.5.Type: GrantFiled: November 27, 1996Date of Patent: February 24, 1998Assignee: Konica CorporationInventors: Masaru Iwagaki, Yoshitaka Yamada
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Patent number: 5694189Abstract: A pixel electrode is disposed with an inclination angle to a base member on a front side (namely, an opposite substrate side) of a liquid crystal display panel. The relation between the reflecting surface of the pixel electrode and the main surface of the base member on the front side of the liquid crystal display panel is defined so that the difference between the reflecting angle of light that is entered as incident light and reflected on the surface of the base member and the leaving angle of light emitted as display light via the liquid crystal display panel exceeds the collection angle of the display apparatus. Thus, undesired light on the main surface of the base member of the display surface is separated from light that is displayed. Consequently, an image free of dazzling and deterioration of contrast ratio due to undesired reflected light can be obtained with a high contrast ratio.Type: GrantFiled: June 7, 1995Date of Patent: December 2, 1997Assignee: Kabushiki Kaisha ToshibaInventors: Hiroki Nakamura, Masato Kemmochi, Yoshitaka Yamada, Yoshihiro Watanabe, Michiya Kobayashi, Nozomu Harada
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Patent number: 5543716Abstract: In a sparkplug voltage probe device in use for an internal combustion engine, an insulator base is attached to the internal combustion engine, an upper surface of the insulator base having a plurality of grooves in which the sparkplug cables are placed. An insulator sheet is embedded in the insulator base. An electrode layer is provided on an upper surface of the insulator base along the grooves to form a static capacity between the electrode layer and the sparkplug cables when the voltage is applied across the spark plugs. On a lower surface of the insulator sheet an electrical shield layer is provided connected to the internal combustion engine by a ground wire. A lead wire electrically connects the electrode plate to a microcomputer so as to analyze the engine burning condition based on the static capacity between the electrode plate and the sparkplug cables.Type: GrantFiled: June 20, 1994Date of Patent: August 6, 1996Assignee: NGK Spark Plug Co., Ltd.Inventors: Shigeru Miyata, Yoshitaka Yamada, Hideji Yoshida, Yoshihiro Matsubara, Yasuo Ito