Patents by Inventor Ikumi Itsumi
Ikumi Itsumi 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: 9818348Abstract: A color display pixel PCD in a liquid crystal display device (100) includes first through fourth pixels P1 through P4 arrayed in two rows by two columns, and first and second signal lines (13a, 13b) which are located in correspondence with each column of pixels and are supplied with signal voltages of polarities opposite to each other from a signal line driving circuit (30) in each vertical scanning period. A TFT (14) of one of the first and third pixel P1 and P3 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b). A TFT (14) of one of the second and fourth pixel P2 and P4 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b).Type: GrantFiled: January 27, 2011Date of Patent: November 14, 2017Assignee: SHARP KABUSHIKI KAISHAInventors: Masae Kitayama, Mitsuaki Hirata, Fumikazu Shimoshikiryoh, Kenichi Hyodo, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka
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Patent number: 9046728Abstract: The present invention is to provide a liquid crystal display device which hardly causes image sticking even when there is a difference in the pixel areas. The liquid crystal display device of the present invention includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates, and is configured such that a pixel is formed by picture elements of a plurality of colors.Type: GrantFiled: October 26, 2010Date of Patent: June 2, 2015Assignee: Sharp Kabushiki KaishaInventors: Ikumi Itsumi, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
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Patent number: 9019186Abstract: A liquid crystal display device (100) according to the present invention has a plurality of pixels that are arranged in columns and rows to form a matrix pattern and one color display pixel (P) is comprised of four or any other larger even number of pixels. The liquid crystal display device (100) of the present invention includes a plurality of source bus lines (13) which run in a column direction. The even number of pixels that form one color display pixel (P) include larger pixels with a relatively large area and smaller pixels with a relatively small area. Each set of pixels to be supplied with a signal voltage from an associated one of the plurality of source bus lines (13) has substantially the same total area as any other set of pixels. According to the present invention, in a liquid crystal display device in which a plurality of pixels that forms one color display pixel includes the larger and smaller pixels, generation of display unevenness that runs in the column direction can be minimized.Type: GrantFiled: January 24, 2011Date of Patent: April 28, 2015Assignee: Sharp Kabushiki KaishaInventors: Toshinori Sugihara, Toshihide Tsubata, Yuki Yamashita, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Kenichi Hyohdoh, Ikumi Itsumi, Akane Sugisaka, Masae Kitayama
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Patent number: 8885131Abstract: A liquid crystal display device (100) according to the present invention includes a color display pixel D including pixels PA through PD arrayed in a matrix. The pixels PA through PD respectively include sub pixels SA1 through SD1and sub pixels SA2 through SD2. At least at an intermediate gray scale level, the luminance of the sub pixels SA2 through SD2 is higher than the luminance of the sub pixels SA1through SD1. The plurality of sub pixels S included in the pixels PA through PD are arrayed in a matrix. The sub pixel SA2 is adjacent to the sub pixel SB2 in the row direction, is adjacent to the sub pixel SC2 in the column direction, and is adjacent to the sub pixel SD2 in an oblique direction.Type: GrantFiled: January 27, 2011Date of Patent: November 11, 2014Assignee: Sharp Kabushiki KaishaInventors: Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
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Patent number: 8749727Abstract: The present invention provides a liquid crystal display device which hardly causes image sticking in a panel in which Cgd gradation is performed, even when the pixel capacitances of the picture elements are different from one another.Type: GrantFiled: November 5, 2010Date of Patent: June 10, 2014Assignee: Sharp Kabushiki KaishaInventors: Ikumi Itsumi, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka
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Patent number: 8552953Abstract: To make a conventional area grayscale display technique applicable to a driving method that is designed to write data in a vertical blanking interval. A display panel with multiple pixels and a display controller that receives an input video signal and a sync signal and gets an image presented on the display panel are provided. If one horizontal scanning period and one vertical scanning period of the input video signal are represented by 1H and V-Total, respectively, the display controller is able to form one vertical scanning period V-Total of a first period in which one horizontal scanning period of the display panel is 1Ho, which is as long as 1H, and a second period in which one horizontal scanning period of the display panel is 1Hn, which is not as long as 1H.Type: GrantFiled: September 27, 2007Date of Patent: October 8, 2013Assignee: Sharp Kabushiki KaishaInventors: Fumikazu Shimoshikiryoh, Masae Kitayama, Ikumi Itsumi
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Publication number: 20130250198Abstract: A liquid crystal display device according to the present invention includes: a plurality of pixels that are arranged in rows and columns so as to form a matrix pattern; and TFTs (TFT-A, TFT-B and TFT-C), source bus lines, gate bus lines and CS bus lines (CS-A and CS-B), which are associated with the respective pixels. Each pixel includes at least three subpixels (SP-A, SP-B and SP-C) with liquid crystal capacitors that are able to retain mutually different voltages. By supplying a signal (CS-A or CS-B) that makes two of the at least three subpixels display mutually different luminances at least at a certain grayscale tone from the source, gate and CS bus lines to each pixel, the at least three subpixels are able to display mutually different luminances.Type: ApplicationFiled: May 9, 2013Publication date: September 26, 2013Applicant: Sharp Kabushiki KaishaInventors: Fumikazu SHIMOSHIKIRYOH, Toshihide TSUBATA, Masanori TAKEUCHI, Masae KITAYAMA, Ikumi ITSUMI, Akihiro SHOHRAKU
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Patent number: 8456583Abstract: A liquid crystal display device according to the present invention includes: a plurality of pixels that are arranged in rows and columns so as to form a matrix pattern; and TFTs (TFT-A, TFT-B and TFT-C), source bus lines, gate bus lines and CS bus lines (CS-A and CS-B), which are associated with the respective pixels. Each pixel includes at least three subpixels (SP-A, SP-B and SP-C) with liquid crystal capacitors that are able to retain mutually different voltages. By supplying a signal (CS-A or CS-B) that makes two of the at least three subpixels display mutually different luminances at least at a certain grayscale tone from the source, gate and CS bus lines to each pixel, the at least three subpixels are able to display mutually different luminances.Type: GrantFiled: March 6, 2008Date of Patent: June 4, 2013Assignee: Sharp Kabushiki KaishaInventors: Fumikazu Shimoshikiryoh, Toshihide Tsubata, Masanori Takeuchi, Masae Kitayama, Ikumi Itsumi, Akihiro Shohraku
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Patent number: 8363175Abstract: A scanning signal line (16) has an opening (29) in the vicinity of an intersection with a data signal line (15). A first transistor (12a) includes two source electrodes (9ax and 9ay) which sandwich a drain electrode (8a); a source electrode (9ax) is connected to the data signal line (15) via a source extension electrode (10ax) stretched above the opening (29), and a source electrode (9ay) is connected to the data signal line (15) via a source extension electrode (10ay) provided off the scanning signal line (16). A second transistor (12b) includes two source electrodes (9bx and 9by) that sandwich a drain electrode (8b) therebetween. A source electrode (9bx) is connected to the data signal line (15) via a source extension electrode (10bx), and a source electrode (9by) is connected to the data signal line (15) via a source extension electrode (10by) off the scanning signal line.Type: GrantFiled: February 22, 2008Date of Patent: January 29, 2013Assignee: Sharp Kabushiki KaishaInventors: Ikumi Itsumi, Toshihide Tsubata
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Publication number: 20130002992Abstract: A liquid crystal display device (100) according to the present invention includes a color display pixel D including pixels PA through PD arrayed in a matrix. The pixels PA through PD respectively include sub pixels SA1 through SD1 and sub pixels SA2 through SD2. At least at an intermediate gray scale level, the luminance of the sub pixels SA2 through SD2 is higher than the luminance of the sub pixels SA1 through SD1. The plurality of sub pixels S included in the pixels PA through PD are arrayed in a matrix. The sub pixel SA2 is adjacent to the sub pixel SB2 in the row direction, is adjacent to the sub pixel SC2 in the column direction, and is adjacent to the sub pixel SD2 in an oblique direction.Type: ApplicationFiled: January 27, 2011Publication date: January 3, 2013Applicant: SHARP KABUSHIKI KAISHAInventors: Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
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Publication number: 20120326954Abstract: The present invention is to provide a liquid crystal display device which hardly causes image sticking even when there is a difference in the pixel areas. The liquid crystal display device of the present invention includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates, and is configured such that a pixel is formed by picture elements of a plurality of colors.Type: ApplicationFiled: October 26, 2010Publication date: December 27, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Ikumi Itsumi, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka, Fumikazu Shimoshikiryoh
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Publication number: 20120320297Abstract: The present invention provides a liquid crystal display device which hardly causes image sticking in a panel in which Cgd gradation is performed, even when the pixel capacitances of the picture elements are different from one another.Type: ApplicationFiled: November 5, 2010Publication date: December 20, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Ikumi Itsumi, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Masae Kitayama, Kenichi Hyohdoh, Yuki Yamashita, Akane Sugisaka
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Publication number: 20120320026Abstract: A color display pixel PCD in a liquid crystal display device (100) includes first through fourth pixels P1 through P4 arrayed in two rows by two columns, and first and second signal lines (13a, 13b) which are located in correspondence with each column of pixels and are supplied with signal voltages of polarities opposite to each other from a signal line driving circuit (30) in each vertical scanning period. A TFT (14) of one of the first and third pixel P1 and P3 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b). A TFT (14) of one of the second and fourth pixel P2 and P4 is connected to the first signal line (13a), and a TFT (14) of the other pixel is connected to the second signal line (13b).Type: ApplicationFiled: January 27, 2011Publication date: December 20, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Masae Kitayama, Mitsuaki Hirata, Fumikazu Shimoshikiryoh, Kenichi Hyodo, Ikumi Itsumi, Yuki Yamashita, Akane Sugisaka
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Publication number: 20120306732Abstract: A liquid crystal display device (100) according to the present invention has a plurality of pixels that are arranged in columns and rows to form a matrix pattern and one color display pixel (P) is comprised of four or any other larger even number of pixels. The liquid crystal display device (100) of the present invention includes a plurality of source bus lines (13) which run in a column direction. The even number of pixels that form one color display pixel (P) include larger pixels with a relatively large area and smaller pixels with a relatively small area. Each set of pixels to be supplied with a signal voltage from an associated one of the plurality of source bus lines (13) has substantially the same total area as any other set of pixels. According to the present invention, in a liquid crystal display device in which a plurality of pixels that forms one color display pixel includes the larger and smaller pixels, generation of display unevenness that runs in the column direction can be minimized.Type: ApplicationFiled: January 24, 2011Publication date: December 6, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Toshinori Sugihara, Toshihide Tsubata, Yuki Yamashita, Fumikazu Shimoshikiryoh, Mitsuaki Hirata, Kenichi Hyohdoh, Ikumi Itsumi, Akane Sugisaka, Masae Kitayama
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Patent number: 8319906Abstract: A scanning signal line (16) includes an opening (29) leading from the outside of a pixel region through below a data signal line (15) into the pixel region, and first and second scanning electrode portions (16a/16b) or two side portions of the opening confronting in a column direction through that opening. The end portion of the first scanning electrode portion (16a) in the pixel region is a first end portion (EP1), and the end portion of the second scanning electrode portion (16b) in the pixel region is a second end portion (EP2). A first transistor has a source electrode (9a) and a drain electrode (8a) individually overlapping the first electrode portion (16a) but not the first end portion (EP1) in the pixel region. A second transistor has a source electrode (9b) and a drain electrode (8b) individually overlapping the second electrode portion (16b) but not the second end portion EP2) in the pixel region.Type: GrantFiled: October 29, 2007Date of Patent: November 27, 2012Assignee: Sharp Kabushiki KaishaInventors: Kenji Enda, Ikumi Itsumi, Toshihide Tsubata, Masanori Takeuchi
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Publication number: 20120274889Abstract: The present invention is to provide a liquid crystal display device which hardly causes image sticking even when there is a difference in the picture element areas. The liquid crystal display device of the present invention includes a pair of substrates, and a liquid crystal layer sandwiched between the pair of substrates, and is configured such that a pixel is formed by picture elements of a plurality of colors.Type: ApplicationFiled: October 26, 2010Publication date: November 1, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Akane Sugisaka, Mitsuaki Hirata, Kenichi Hyohdoh, Masae Kitayama, Ikumi Itsumi, Yuki Yamashita, Fumikazu Shimoshikiryoh
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Patent number: 8045073Abstract: The present invention provides a liquid crystal display device which can more improve a luminance when the liquid crystal display device includes a column spacer. The present invention is a liquid crystal display device including a pair of substrates and a liquid crystal layer interposed between the pair of substrates, and the liquid crystal display device having a red pixel, a green pixel, and a blue pixel, wherein a column spacer structure is arranged in the red pixel among three pixels of the red, green, and blue pixels, and the red pixel has the smallest aperture ratio of the three pixels.Type: GrantFiled: September 20, 2007Date of Patent: October 25, 2011Assignee: Sharp Kabushiki KaishaInventors: Ikumi Itsumi, Fumikazu Shimoshikiryoh, Masae Kawabata
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Publication number: 20100141849Abstract: A scanning signal line (16) includes an opening (29) leading from the outside of a pixel region through below a data signal line (15) into the pixel region, and first and second scanning electrode portions (16a/16b) or two side portions of the opening confronting in a column direction through that opening. The end portion of the first scanning electrode portion (16a) in the pixel region is a first end portion (EP1), and the end portion of the second scanning electrode portion (16b) in the pixel region is a second end portion (EP2). A first transistor has a source electrode (9a) and a drain electrode (8a) individually overlapping the first electrode portion (16a) but not the first end portion (EP1) in the pixel region. A second transistor has a source electrode (9b) and a drain electrode (8b) individually overlapping the second electrode portion (16b) but not the second end portion EP2) in the pixel region.Type: ApplicationFiled: October 29, 2007Publication date: June 10, 2010Inventors: Kenji Enda, Ikumi Itsumi, Toshihide Tsubata, Masanori Takeuchi
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Publication number: 20100109989Abstract: A scanning signal line (16) has an opening (29) in the vicinity of an intersection with a data signal line (15). A first transistor (12a) includes two source electrodes (9ax and 9ay) which sandwich a drain electrode (8a); a source electrode (9ax) is connected to the data signal line (15) via a source extension electrode (10ax) stretched above the opening (29), and a source electrode (9ay) is connected to the data signal line (15) via a source extension electrode (10ay) provided off the scanning signal line (16). A second transistor (12b) includes two source electrodes (9bx and 9by) that sandwich a drain electrode (8b) therebetween. A source electrode (9bx) is connected to the data signal line (15) via a source extension electrode (10bx), and a source electrode (9by) is connected to the data signal line (15) via a source extension electrode (10by) off the scanning signal line.Type: ApplicationFiled: February 22, 2008Publication date: May 6, 2010Inventors: Ikumi Itsumi, Toshihide Tsubata
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Publication number: 20100103339Abstract: A liquid crystal display device according to the present invention includes: a plurality of pixels that are arranged in rows and columns so as to form a matrix pattern; and TFTs (TFT-A, TFT-B and TFT-C), source bus lines, gate bus lines and CS bus lines (CS-A and CS-B), which are associated with the respective pixels. Each pixel includes at least three subpixels (SP-A, SP-B and SP-C) with liquid crystal capacitors that are able to retain mutually different voltages. By supplying a signal (CS-A or CS-B) that makes two of the at least three subpixels display mutually different luminances at least at a certain grayscale tone from the source, gate and CS bus lines to each pixel, the at least three subpixels are able to display mutually different luminances.Type: ApplicationFiled: March 6, 2008Publication date: April 29, 2010Inventors: Fumikazu Shimoshikiryoh, Toshihide Tsubata, Masanori Takeuchi, Masae Kitayama, Ikumi Itsumi, Akihiro Shohraku