Patents by Inventor Koichi Miyachi
Koichi Miyachi 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: 6885421Abstract: A positive uniaxial film 14 with a retardation of Rp [nm] in an in-plane direction is disposed between a vertical alignment mode liquid crystal cell 11 and a polarizing plate 12, and a negative uniaxial film 15 with a retardation of Rn [nm] in a thickness direction is disposed between the positive uniaxial film 14 and the polarizing plate 12. Further, when a parameter ?1 [nm] in relation to Rp is 35+(Rlc/80?4)2×3.5+(360?Rlc)×Rtac/850; and a parameter ?1 [nm] in relation to Rn is Rlc?1.9×Rtac, where Rtac [nm] is a retardation in a thickness direction of the respective base films of polarizing plates 12 and 13, the retardations Rp and Rn are set to fall within ranges of 80% to 120% of the parameter ?1 and 60% to 90% of the parameter ?1, respectively.Type: GrantFiled: March 4, 2003Date of Patent: April 26, 2005Assignee: Sharp Kabushiki KaishaInventor: Koichi Miyachi
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Publication number: 20050041047Abstract: A liquid crystal display device carries out tone display with pixels by applying a tone voltage according to tone data to each pixel in each frame, and includes: an LUT memory, which receives tone data of a display frame and tone data of an immediately preceding frame, for converting and outputting the tone data of the display frame; a source driver for applying the tone voltage to the pixels based on the converted tone data outputted from the LUT memory; and a liquid crystal cell, which makes up the pixels, for realizing tone display by the applied tone voltage, wherein the LUT memory stores beforehand output tone data which is specified by the tone data of the display frame and the tone data of the immediately preceding frame. This reduces a voltage change of pixel electrodes which is associated with a tone change to suppress unmatched tone display, thereby improving image quality of moving images.Type: ApplicationFiled: September 21, 2004Publication date: February 24, 2005Applicant: SHARP KABUSHIKI KAISHAInventors: Hidekazu Miyata, Makoto Shiomi, Akihito Jinda, Kazunari Tomizawa, Koichi Miyachi
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Publication number: 20050041196Abstract: A dielectric liquid layer is sandwiched between a pixel substrate and a counter substrate, at least one of which is a transparent. The dielectric liquid layer is made from a liquid that is macroscopically isotropic and transparent, but has clusters microscopically, the clusters being agglomerations in each of which liquid crystal molecules are aligned in short distance order. Because of the presence of the cluster even at a temperature equal to or higher than the liquid crystal-isotropic phase transition temperature of a liquid crystal compound, reduction of the Kerr effect is suppressed even if the temperature rises. For example, clusters containing, for example, (a) a liquid crystal compound having an ability of forming an intermolecular hydrogen bond, (b) a liquid crystal compound having a smectic phase, (c) a particulate, (d) or the like, has a large cluster size and thus have a long life even if the temperature rises.Type: ApplicationFiled: August 18, 2004Publication date: February 24, 2005Applicant: SHARP KABUSHIKI KAISHAInventors: Shoichi Ishihara, Koichi Miyachi
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Patent number: 6853384Abstract: A liquid crystal display device carries out tone display with pixels by applying a tone voltage according to tone data to each pixel in each frame, and includes: an LUT memory, which receives tone data of a display frame and tone data of an immediately preceding frame, for converting and outputting the tone data of the display frame; a source driver for applying the tone voltage to the pixels based on the converted tone data outputted from the LUT memory; and a liquid crystal cell, which makes up the pixels, for realizing tone display by the applied tone voltage, wherein the LUT memory stores beforehand output tone data which is specified by the tone data of the display frame and the tone data of the immediately preceding frame. This reduces a voltage change of pixel electrodes which is associated with a tone change to suppress unmatched tone display, thereby improving image quality of moving images.Type: GrantFiled: September 17, 2001Date of Patent: February 8, 2005Assignee: Sharp Kabushiki KaishaInventors: Hidekazu Miyata, Makoto Shiomi, Akihito Jinda, Kazunari Tomizawa, Koichi Miyachi
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Publication number: 20050024310Abstract: A liquid crystal display apparatus includes a plurality of areas in which response speeds greatly different from each other coexist in a pixel. A first replacement process section replaces the image data of the desired target frame with a first gradation, when a gradation transition from a current frame to a desired target frame corresponds to the above gradation transition. A second replacement process section replaces the image data of the current frame with a second value. The first value is set to a value causing the pixel to respond at a relatively higher speed without the occurrence of the excessive brightness. Without avoiding the deterioration of the image, it is possible to drive a liquid crystal display apparatus including areas whose response speeds are different from each other coexist in the pixel, such as a liquid crystal display apparatus of vertically aligned mode and normally black mode.Type: ApplicationFiled: March 19, 2004Publication date: February 3, 2005Inventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Tomoo Furukawa
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Publication number: 20040263456Abstract: A color display device determines a relationship between RGB components of an input color image signal in terms of their gradation levels, and carries out a different calculation for each input color image signal depending on which of six patterns of the relationship that the input color image signal belongs to. Further, the color display device carries out the calculation for each of the RGB components excluding a component with a smallest gradation level, using variables that vary depending on the respective gradation levels of the RGB components.Type: ApplicationFiled: April 16, 2004Publication date: December 30, 2004Inventors: Koichi Miyachi, Akihito Jinda, Hidekazu Miyata, Kazunari Tomizawa, Makoto Shiomi
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Publication number: 20040239856Abstract: A liquid crystal display device includes a pair of substrates, i.e. a TFT substrate and an opposed substrate. The pair of substrates sandwich a liquid crystal layer. The TFT substrate has a picture element electrode, and the opposed substrate has an opposed electrode. The picture element electrode has picture element slits. The opposed electrode has opposed ribs within a display region. A height of the opposed ribs is identical to a thickness of the liquid crystal layer. When a voltage is applied to the picture element electrode and to the opposed electrode, a plurality of domains are formed within the display region. The plurality of domains are such that liquid crystal molecules are aligned in different directions from domain to domain. Thus realized is such domain division that (1) enhances alignment regulation of liquid crystal, so that the liquid crystal will not be influenced even if a display panel is pressed, (2) attains an excellent viewing field characteristic, and (3) attains an excellent response.Type: ApplicationFiled: May 20, 2004Publication date: December 2, 2004Applicant: SHARP KABUSHIKI KAISHAInventor: Koichi Miyachi
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Patent number: 6822715Abstract: A liquid crystal display device includes a first substrate; a second substrate; and a liquid crystal layer interposed between the first substrate and the second substrate and having liquid crystal molecules therein. The first substrate includes a first electrode facing the liquid crystal layer. The second substrate includes a second electrode facing the liquid crystal layer. The first electrode, the second electrode, and a region of the liquid crystal layer supplied with a voltage by the first electrode and the second electrode define a pixel region which is a unit for display. The pixel region includes a plurality of sub pixel regions, in each of which the liquid crystal molecules are aligned in an axial symmetrical manner. At least one of the first electrode and the second electrode includes a plurality of openings, which are regularly arranged, in the pixel region.Type: GrantFiled: April 4, 2002Date of Patent: November 23, 2004Assignee: Sharp Kabushiki KaishaInventors: Koichi Miyachi, Makoto Shiomi, Nobukazu Nagae, Mutsumi Nakajima
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Publication number: 20040212606Abstract: A self-luminous image display apparatus A includes an output section 10 for displaying an image, a reflection section 20 provided on a rear side of the output section 10 with a reflective surface thereof facing the output section, and a light-emitting section 30 provided on a rear side of the output section 10. The output section 10 includes a linear polarization device 15 provided so as to cover a display surface for transmitting only predetermined linearly-polarized light of ambient light, and a retardation film 14 provided closer to the light-emitting section than the linear polarization device 15 for turning linearly-polarized light coming from a direction normal to the display surface and transmitted through the linear polarization device 15 into circularly-polarized light.Type: ApplicationFiled: February 26, 2004Publication date: October 28, 2004Inventors: Koichi Miyachi, Motohiro Yamahara, Yoshihiro Izumi
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Publication number: 20040207794Abstract: A liquid crystal display device includes a first substrate; a second substrate; and a liquid crystal layer interposed between the first substrate and the second substrate and having liquid crystal molecules therein. The first substrate includes a first electrode facing the liquid crystal layer. The second substrate includes a second electrode facing the liquid crystal layer. The first electrode, the second electrode, and a region of the liquid crystal layer supplied with a voltage by the first electrode and the second electrode define a pixel region which is a unit for display. The pixel region includes a plurality of sub pixel regions, in each of which the liquid crystal molecules are aligned in an axial symmetrical manner. At least one of the first electrode and the second electrode includes a plurality of openings, which are regularly arranged, in the pixel region.Type: ApplicationFiled: November 10, 2003Publication date: October 21, 2004Applicant: Sharp Kabushiki KaishaInventors: Koichi Miyachi, Makoto Shiomi, Nobukazu Nagai, Mutsumi Nakajima
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Publication number: 20040201341Abstract: A self-luminous image display apparatus of the present invention includes an output section for displaying an image, a reflection section provided on a rear side of the output section with a reflective surface thereof facing the output section, and a light-emitting section provided on a rear side of the output section. The output section includes a linear polarization device provided so as to cover a display surface for transmitting only predetermined linearly-polarized light of ambient light, and a retardation film provided closer to the light-emitting section than the linear polarization device for turning the linearly-polarized light transmitted through the linear polarization device into circularly-polarized light. The linear polarization device has a degree of polarization greater than 70.0%.Type: ApplicationFiled: February 20, 2004Publication date: October 14, 2004Inventors: Koichi Miyachi, Motohiro Yamahara, Yoshihiro Izumi
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Publication number: 20040196234Abstract: A noise adding circuit adds noise data to video data, and a circuit rounds a less significant bit, so as to output video data of 6 bits from 8 bit input data for example. The video data of 6 bits is stored in a frame memory until a further next frame, and a previous frame grayscale correction circuit corrects video data of a previous frame as required so that the video data of the previous frame approaches video data of a further previous frame. It then outputs thus corrected video data. Further, a modulation processing section corrects video data of a current frame so as to emphasize grayscale transition from the video data of the previous frame which is outputted by the previous frame grayscale correction circuit. Thus, it is possible to realize a driving device of an image display device, which can improve a response speed of pixels and has a simple arrangement, without apparently deteriorating display quality of an image displayed in the pixels.Type: ApplicationFiled: April 2, 2004Publication date: October 7, 2004Inventors: Makoto Shiomi, Tomoo Furukawa, Koichi Miyachi, Kazunari Tomizawa
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Publication number: 20040183761Abstract: A line memory interpolates interlace video signals between horizontal lines to generate current-field video signals of one frame. A field memory stores the current-field video signals until input of the next field, and interpolates video signals between horizontal lines in the previous field to generate previous-field video signals of one frame. In the current-field video signals and previous-field video signals, an arithmetic circuit refers to video signals corresponding to the same pixels, so as to generate correction video signals for these pixels. By thus driving a group of pixels of one frame on a field basis, luminance can be increased. Further, by modulating the driving signals based on video signals of the previous field, a response speed of the pixels can be increased. Despite these advantages, modulation error will not be caused by mispairing of calculated video signals, thereby providing a display device with good display quality.Type: ApplicationFiled: December 23, 2003Publication date: September 23, 2004Inventors: Koichi Miyachi, Hidekazu Miyata, Akihito Jinda, Kazunari Tomizawa, Makoto Shiomi
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Publication number: 20040135800Abstract: In a method for driving a display, a display, and a program therefor, a memory stores uncorrected video data for a desired frame and for a current frame until a next frame. Meanwhile, a correction section reads uncorrected video data for the previous frame and the current frame from the memory and corrects the video data for the current frame. Further, a processing section corrects video data for the next frame based on the corrected video data for current frame so as to facilitate a grayscale level transition from the current frame to the next frame.Type: ApplicationFiled: December 24, 2003Publication date: July 15, 2004Inventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Mitsuhiro Shigeta
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Publication number: 20040135777Abstract: A display has a circuit for comparing video data for a first or current frame with video data for a second or desired frame. A processing section makes an instruction for a process to take place if certain conditions are met. In response to the instruction for a process, a signal generating circuit outputs a signal which reduces a degree of modulation or variation by which tone transition is facilitated relatively to a case where pixels are driven on the basis of data output from an ordinary processing section. Thus, by modulating or varying a drive signal to a degree suitable for a case where tone transition is sufficient, a display capable of improving display quality even in a situation where the display is not capable of being driven suitably, can be realized using circuitry of a relatively small scale.Type: ApplicationFiled: October 7, 2003Publication date: July 15, 2004Inventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Mitsuhiro Shigeta
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Publication number: 20040135799Abstract: Data, such as video signal data, for example, for a next desired frame is first modulated or varied to facilitate a transition from a current frame to a next desired frame. A modulation processing section can be used, for example, to thus produce a corrected video signal to facilitate the current-to-next desired grayscale level transition. Thereafter, spatial filtering is then carried on the corrected video signal, using a spatial filtering section for example. As such, high frequency components in a spatial domain may be reduced, even after the spatial frequencies of an ordinary video signal and potentially those of noise have been scaled up. Therefore, undesirable noise-caused display quality degradation can be reduced or even prevented, while pixel response speed as a result of the facilitation of grayscale level transition, is increased.Type: ApplicationFiled: December 24, 2003Publication date: July 15, 2004Inventors: Makoto Shiomi, Kazunari Tomizawa, Koichi Miyachi, Tomoo Furukawa
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Patent number: 6759749Abstract: The circuit structure of the present invention has a plurality of conductive path layers and at least one interlayer isolating layer formed between the plurality of conductive path layers. Each of the plurality of conductive path layers has at least one conductive path capable of transmitting light or electricity therethrough. Each of a plurality of input/output (I/O) sections is connected to any one of the plurality of conductive paths. Each of the plurality of conductive path layers has a first laminated structure that includes a plurality of first conductive layers and at least one first isolating layer formed therebetween. The interlayer isolating layer has a second laminated structure that includes a plurality of second isolating layers and at least one second conductive layer formed therebetween.Type: GrantFiled: April 5, 2002Date of Patent: July 6, 2004Assignee: Sharp Kabushiki KaishaInventors: Koichi Miyachi, Yoshihiro Izumi, Hiroshi Gohda
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Publication number: 20040114080Abstract: A positive uniaxial film 14 with a retardation of Rp [nm] in an in-plane direction is disposed between a vertical alignment mode liquid crystal cell 11 and a polarizing plate 12, and a negative uniaxial film 15 with a retardation of Rn [nm] in a thickness direction is disposed between the positive uniaxial film 14 and the polarizing plate 12. Further, when a parameter &agr;1 [nm] in relation to Rp is 35+(Rlc/80−4)2×3.5+(360−Rlc)×Rtac/850; and a parameter &bgr;1 [nm] in relation to Rn is Rlc−1.9×Rtac, where Rtac [nm] is a retardation in a thickness direction of the respective base films of polarizing plates 12 and 13, the retardations Rp and Rn are set to fall within ranges of 80% to 120% of the parameter &agr;1 and 60% to 90% of the parameter &bgr;1, respectively.Type: ApplicationFiled: August 12, 2003Publication date: June 17, 2004Inventor: Koichi Miyachi
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Publication number: 20040085507Abstract: A liquid crystal optical element includes two substrates, a liquid crystal layer, and at least two electrodes. The liquid crystal layer is provided between the substrates and includes liquid crystal molecules and dichroic dye molecules. The at least two electrodes are provided on the substrates so as to face each other with the liquid crystal layer interposed between them, and define one of multiple unit regions. In each unit region, the liquid crystal layer includes first and second liquid crystal regions within a range, which is approximately half or less as long as the wavelength of visible radiation as measured in a direction parallel to the surfaces of the substrates. The orientation directions of each pair of liquid crystal molecules in the first and second liquid crystal regions have azimuthal directions defining an angle of approximately 90 degrees while no voltage is being applied between the electrodes.Type: ApplicationFiled: October 21, 2003Publication date: May 6, 2004Applicant: Sharp Kabushiki KaishaInventors: Koichi Miyachi, Seiji Shibahara
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Publication number: 20040070699Abstract: A liquid crystal optical element includes: first and second substrates; a liquid crystal layer provided between the substrates; first and second electrode layers provided on the first and second substrates, respectively, so as to face each other with the liquid crystal layer interposed between them; and first and second switching layers, which are provided between the first electrode layer and the liquid crystal layer and between the second electrode layer and the liquid crystal layer, respectively, and each of which includes molecules changing their orientation directions in response to a voltage applied between the first and second electrode layers. The liquid crystal layer changes its orientation state as the molecules in the first and second switching layers change their orientation directions. Each of the molecules included in one of the first and second switching layers and an associated one of the molecules included in the other switching layer behave as enantiomers.Type: ApplicationFiled: October 7, 2003Publication date: April 15, 2004Applicant: SHARP KABUSHIKI KAISHAInventors: Koichi Miyachi, Seiji Shibahara