Patents by Inventor Teppei Kurosawa
Teppei Kurosawa 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: 20190094666Abstract: A liquid crystal driving apparatus configured to drive a liquid crystal display element includes a processor configured to generate a display image signal from an input image signal, and a driver configured to display, according to the display image signal, a tone to a pixel in the liquid crystal display element by controlling a voltage applied to the pixel in each of a plurality of subframe periods contained in one frame period between a first voltage and a second voltage lower than the first voltage. The processor performs a smoothing process for smoothing a tonal difference equal to or smaller than 3% of a full scale value of the tone in a target image area in the input image signal.Type: ApplicationFiled: September 19, 2018Publication date: March 28, 2019Inventor: Teppei Kurosawa
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Patent number: 9734774Abstract: The image signal generating apparatus for a liquid crystal display element. A corner detector detects, when an input image signal contains multiple frame images each of which includes a first image area having a first tone and including a corner portion and a second image area having a second tone higher than the first tone and being adjacent in vertical, horizontal and oblique directions to the corner portion, the corner portion in each frame image, a tone provider generates an output image signal by providing a third tone lower than the second tone to one specific pixel adjacent in the oblique direction to a vertex of the corner portion in at least one of the multiple frame images. The tone provider provides the third tone to the specific pixel when the input image signal is a moving image signal.Type: GrantFiled: December 16, 2015Date of Patent: August 15, 2017Assignee: CANON KABUSHIKI KAISHAInventor: Teppei Kurosawa
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Publication number: 20160180794Abstract: The image signal generating apparatus for a liquid crystal display element. A corner detector detects, when an input image signal contains multiple frame images each of which includes a first image area having a first tone and including a corner portion and a second image area having a second tone higher than the first tone and being adjacent in vertical, horizontal and oblique directions to the corner portion, the corner portion in each frame image, a tone provider generates an output image signal by providing a third tone lower than the second tone to one specific pixel adjacent in the oblique direction to a vertex of the corner portion in at least one of the multiple frame images. The tone provider provides the third tone to the specific pixel when the input image signal is a moving image signal.Type: ApplicationFiled: December 16, 2015Publication date: June 23, 2016Inventor: Teppei Kurosawa
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Patent number: 8823617Abstract: A liquid crystal display apparatus includes a feature amount generator configured to generate a feature amount based on the number of pixel pairs that satisfy a correspondence relationship between a gradation value of a target pixel and a gradation value of a surrounding pixel around the target pixel for a image represented by an input image signal, a processor configured to provide processing so as to set a correction value that reduces a dynamic range of a gradation value of the input image signal when the feature amount is larger than a first threshold, and so as not to set the correction value when the feature amount is equal to or smaller than the first threshold, and a liquid crystal driver configured to drive a liquid crystal display element based on the input image signal that has been corrected by the correction value.Type: GrantFiled: March 20, 2012Date of Patent: September 2, 2014Assignee: Canon Kabushiki KaishaInventor: Teppei Kurosawa
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Patent number: 8432346Abstract: A liquid crystal display apparatus is disclosed which can prevent occurrence of flicker regardless of display modes. The apparatus includes a liquid crystal modulation element which includes a liquid crystal layer between a first electrode and a second electrode, a controller which controls a potential difference to be applied between the first and second electrodes. The apparatus operates in first and second modes, which are different in the light amount entering the element. A memory stores first information for the first mode and second information for the second mode as controlling information on a potential difference between the electrodes for suppressing flicker within a certain range. The controller controls the potential difference between the electrodes based on the first information when the first mode is set and controls the potential difference between the electrodes based on the second information when the second mode is set.Type: GrantFiled: December 22, 2006Date of Patent: April 30, 2013Assignee: Canon Kabushiki KaishaInventors: Masayuki Abe, Jun Koide, Yuya Kurata, Teppei Kurosawa
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Publication number: 20120242717Abstract: A liquid crystal display apparatus includes a feature amount generator configured to generate a feature amount based on the number of pixel pairs that satisfy a correspondence relationship between a gradation value of a target pixel and a gradation value of a surrounding pixel around the target pixel for a image represented by an input image signal, a processor configured to provide processing so as to set a correction value that reduces a dynamic range of a gradation value of the input image signal when the feature amount is larger than a first threshold, and so as not to set the correction value when the feature amount is equal to or smaller than the first threshold, and a liquid crystal driver configured to drive a liquid crystal display element based on the input image signal that has been corrected by the correction value.Type: ApplicationFiled: March 20, 2012Publication date: September 27, 2012Applicant: CANON KABUSHIKI KAISHAInventor: Teppei KUROSAWA
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Patent number: 8154494Abstract: A liquid crystal display device includes a liquid crystal modulation element including a first electrode, a second electrode, and a liquid crystal layer, a potential difference providing unit that provides a potential difference between the first electrode and the second electrode, and an illumination optical system that illuminates the liquid crystal modulation element by using light from a light source. The liquid crystal display device includes a charge adjusting mode for reducing the intensity of an electric field generated by electric charge stored between the liquid crystal layer and at least one of the first electrode and the second electrode.Type: GrantFiled: December 20, 2006Date of Patent: April 10, 2012Assignee: Canon Kabushiki KaishaInventors: Jun Koide, Masayuki Abe, Yuya Kurata, Teppei Kurosawa
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Patent number: 8068076Abstract: A liquid crystal display apparatus includes a liquid crystal modulation element having a liquid crystal layer and first and second electrodes, and a controller performs control for an electric potential difference applied between the electrodes such that an electric field applied to the liquid crystal layer is inverted between positive and negative. The controller switches the control between first control and second control. The first control controls the electric potential difference such that one of an absolute value of a time-integrated value of the positive electric field applied to the liquid crystal layer and an absolute value of a time-integrated value of the negative electric field applied thereto is larger than the other, and the second control controls the electric potential difference such that the other absolute value of the time-integrated value is larger than the one absolute value of the time-integrated value.Type: GrantFiled: May 1, 2008Date of Patent: November 29, 2011Assignee: Canon Kabushiki KaishaInventor: Teppei Kurosawa
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Patent number: 7724223Abstract: A liquid crystal display apparatus is disclosed which can prevent occurrence of flicker for a long time. The apparatus comprises a liquid crystal modulation element which includes a first electrode, a second electrode made of a material different from that of the first electrode, a liquid crystal layer disposed between the first and second electrodes, a first alignment film disposed between the first electrode and the liquid crystal layer, and a second alignment film disposed between the second electrode and the liquid crystal layer. The apparatus also comprises a controller which changes at least one of the potential to be applied to the first electrode and the central potential of the potential to be applied to the second electrode, which periodically changes between positive and negative with respect to the central potential, such that flicker is suppressed within a certain range.Type: GrantFiled: December 27, 2006Date of Patent: May 25, 2010Assignee: Canon Kabushiki KaishaInventors: Teppei Kurosawa, Jun Koide, Masayuki Abe, Yuya Kurata
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Publication number: 20080273129Abstract: A liquid crystal display apparatus includes a liquid crystal modulation element having a liquid crystal layer and first and second electrodes, and a controller performs control for an electric potential difference applied between the electrodes such that an electric field applied to the liquid crystal layer is inverted between positive and negative. The controller switches the control between first control and second control. The first control controls the electric potential difference such that one of an absolute value of a time-integrated value of the positive electric field applied to the liquid crystal layer and an absolute value of a time-integrated value of the negative electric field applied thereto is larger than the other, and the second control controls the electric potential difference such that the other absolute value of the time-integrated value is larger than the one absolute value of the time-integrated value.Type: ApplicationFiled: May 1, 2008Publication date: November 6, 2008Applicant: CANON KABUSHIKI KAISHAInventor: Teppei Kurosawa
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Publication number: 20070176877Abstract: A liquid crystal display apparatus is disclosed which can prevent occurrence of flicker for a long time. The apparatus comprises a liquid crystal modulation element which includes a first electrode, a second electrode made of a material different from that of the first electrode, a liquid crystal layer disposed between the first and second electrodes, a first alignment film disposed between the first electrode and the liquid crystal layer, and a second alignment film disposed between the second electrode and the liquid crystal layer. The apparatus also comprises a controller which changes at least one of the potential to be applied to the first electrode and the central potential of the potential to be applied to the second electrode, which periodically changes between positive and negative with respect to the central potential, such that flicker is suppressed within a certain range.Type: ApplicationFiled: December 27, 2006Publication date: August 2, 2007Inventors: Teppei KUROSAWA, Jun KOIDE, Masayuki ABE, Yuya KURATA
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Publication number: 20070164965Abstract: A liquid crystal display apparatus is disclosed which can prevent occurrence of flicker regardless of display modes. The apparatus includes a liquid crystal modulation element which includes a liquid crystal layer between a first electrode and a second electrode, a controller which controls a potential difference to be applied between the first and second electrodes. The apparatus operates in first and second modes, which are different in the light amount entering the element. A memory stores first information for the first mode and second information for the second mode as controlling information on a potential difference between the electrodes for suppressing flicker within a certain range. The controller controls the potential difference between the electrodes based on the first information when the first mode is set and controls the potential difference between the electrodes based on the second information when the second mode is set.Type: ApplicationFiled: December 22, 2006Publication date: July 19, 2007Inventors: Masayuki Abe, Jun Koide, Yuya Kurata, Teppei Kurosawa
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Publication number: 20070159428Abstract: A liquid crystal display includes a liquid crystal modulator that includes first and second electrodes, and a liquid crystal layer between the first and second electrodes, and a controller for changing at least one of potential provided to the first electrode and central potential of the potential provided to the second electrode so that flicker falls within a specific range after power is turned on and before a charging phenomenon in the liquid crystal modulator is stabilized.Type: ApplicationFiled: December 26, 2006Publication date: July 12, 2007Inventors: Yuya Kurata, Jun Koide, Teppei Kurosawa, Masayuki Abe
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Publication number: 20070159427Abstract: A liquid crystal display device includes a liquid crystal modulation element including a first electrode, a second electrode, and a liquid crystal layer, a potential difference providing unit that provides a potential difference between the first electrode and the second electrode, and an illumination optical system that illuminates the liquid crystal modulation element by using light from a light source. The liquid crystal display device includes a charge adjusting mode for reducing the intensity of an electric field generated by electric charge stored between the liquid crystal layer and at least one of the first electrode and the second electrode.Type: ApplicationFiled: December 20, 2006Publication date: July 12, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Jun Koide, Masayuki Abe, Yuya Kurata, Teppei Kurosawa