Patents by Inventor Takao Imaoku
Takao Imaoku 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: 11402707Abstract: A liquid crystal display device includes: a first liquid crystal cell; a second liquid crystal cell disposed in a backlight side; and a first optical sheet and a second optical sheet both having an identical layer structure. The first optical sheet is disposed on a front surface side of the first liquid crystal cell and the second optical sheet is disposed on a back surface side of the second liquid crystal cell, or vice versa.Type: GrantFiled: May 2, 2019Date of Patent: August 2, 2022Assignees: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD., PASONA KNOWLEDGE PARTNER INC.Inventors: Yoichi Yasui, Takao Imaoku, Katsuhiro Kikuchi, Kazuhiko Tsuda
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Patent number: 11367413Abstract: A display device for displaying image data includes: a gradation conversion circuit that converts a gradation of input image data; a display panel that displays the image data with the gradation converted by the gradation conversion circuit; an illuminance sensor that detects illuminance of an environment where the display device is placed; and a gamma characteristic corrector that controls a gradation conversion circuit so as to convert the gradation by use of a gamma characteristic corresponding to the detected illuminance.Type: GrantFiled: December 8, 2020Date of Patent: June 21, 2022Assignee: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.Inventors: Masaki Tsubokura, Takao Imaoku, Takashi Kato
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Publication number: 20210241718Abstract: A display device for displaying image data includes: a gradation conversion circuit that converts a gradation of input image data; a display panel that displays the image data with the gradation converted by the gradation conversion circuit; an illuminance sensor that detects illuminance of an environment where the display device is placed; and a gamma characteristic corrector that controls a gradation conversion circuit so as to convert the gradation by use of a gamma characteristic corresponding to the detected illuminance.Type: ApplicationFiled: December 8, 2020Publication date: August 5, 2021Inventors: Masaki TSUBOKURA, Takao IMAOKU, Takashi KATO
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Patent number: 10718966Abstract: A liquid crystal display device comprises: a first display panel including a first liquid crystal cell and a pair of first polarizing plates sandwiching the first liquid crystal cell; a second display panel including a second liquid crystal cell and a pair of second polarizing plates sandwiching the second liquid crystal cell; and a bonding member bonding one of the pair of first polarizing plates of the first display panel and one of the pair of second polarizing plates of the second display panel together. An end of the bonding member is located inside an end of the first polarizing plate and an end of the second polarizing plate.Type: GrantFiled: July 31, 2018Date of Patent: July 21, 2020Assignees: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD., PASONA KNOWLEDGE PARTNER INC.Inventors: Takao Imaoku, Kazuhiko Tsuda, Ikuko Imajo, Yusuke Katagiri
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Publication number: 20200209668Abstract: A liquid crystal display device includes: a first display panel including a first liquid crystal cell; a second display panel including a second liquid crystal cell; and a bonding member that bonds the first and the second display panels together. The bonding member is made of a photocurable resin. In a section in a thickness direction of the first display panel and parallel to either a longitudinal axis direction or a latitudinal axis direction of the first display panel, a relative curing reaction rate at a central representative point of the bonding member is greater than a relative curing reaction rate at an end representative point of the bonding member. A difference between the relative curing reaction rate at the central representative point of the bonding member and the relative curing reaction rate at the end representative point of the bonding member falls within 4%.Type: ApplicationFiled: December 18, 2019Publication date: July 2, 2020Inventors: Kazuhiko TSUDA, Takao IMAOKU, Ikuko IMAJO
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Patent number: 10401693Abstract: A liquid crystal module which is disposed opposite a backlight includes: a first liquid crystal panel which includes a pair of first transparent substrates; a second liquid crystal panel which is disposed between the backlight and the first liquid crystal panel and includes a pair of second transparent substrates; and a diffuser sheet disposed therebetween. A first transparent substrate that is closer to the diffuser sheet among the pair of first transparent substrates is thinner than a second transparent substrate that is closer to the diffuser sheet among the pair of second transparent substrates.Type: GrantFiled: March 29, 2017Date of Patent: September 3, 2019Assignee: PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD.Inventors: Katsuhiro Kikuchi, Kazuhiko Tsuda, Takao Imaoku, Yoichi Yasui
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Publication number: 20190258101Abstract: A liquid crystal display device includes: a first liquid crystal cell; a second liquid crystal cell disposed in a backlight side; and a first optical sheet and a second optical sheet both having an identical layer structure. The first optical sheet is disposed on a front surface side of the first liquid crystal cell and the second optical sheet is disposed on a back surface side of the second liquid crystal cell, or vice versa.Type: ApplicationFiled: May 2, 2019Publication date: August 22, 2019Inventors: Yoichi YASUI, Takao IMAOKU, Katsuhiro KIKUCHI, Kazuhiko TSUDA
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Patent number: 10353237Abstract: A lighting device includes LEDs 17, and a light guide plate 19 including an edge surface and a pair of plate surfaces, a part of the edge surface being a light entrance surface 19B through which light from the LEDs 17 enters, and one of the plate surfaces being a light exit surface 19A through which the light exits and another one of the plate surfaces being an opposite plate surface 19C opposite from the light exit surface 19A. The light guide plate 19 includes prism portions 51 on the opposite plate surface 19C, projecting from the opposite plate surface 19C and arranged in the X-axis direction and configured to collect light toward in a normal direction of the light exit surface 19A, and an exit light reflection portion 60 provided in a recessed portion 52 that is formed by two adjacent prism portions 51 and configured to reflect light travelling within the light guide plate 19 and facilitate exiting of light from the light guide plate 19.Type: GrantFiled: December 3, 2015Date of Patent: July 16, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Yoshinobu Hirayama, Takao Imaoku, Shugo Yagi
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Patent number: 10310164Abstract: A lighting device includes a light guide plate, a plurality of LEDs positioned to project light into a first side surface of the light guide plate, a reflection sheet facing a bottom surface of the light guide plate, a plurality of reflective elements on a light exit surface of the light guide plate opposite the bottom surface and extending in a direction parallel to the first side surface, and a plurality of convex elements on the bottom surface of the light guide plate. The density of the convex elements increases with increasing distance from the light source.Type: GrantFiled: December 3, 2015Date of Patent: June 4, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Yoshinobu Hirayama, Takao Imaoku, Shugo Yagi
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Publication number: 20190041684Abstract: A liquid crystal display device comprises: a first display panel including a first liquid crystal cell and a pair of first polarizing plates sandwiching the first liquid crystal cell; a second display panel including a second liquid crystal cell and a pair of second polarizing plates sandwiching the second liquid crystal cell; and a bonding member bonding one of the pair of first polarizing plates of the first display panel and one of the pair of second polarizing plates of the second display panel together. An end of the bonding member is located inside an end of the first polarizing plate and an end of the second polarizing plate.Type: ApplicationFiled: July 31, 2018Publication date: February 7, 2019Inventors: Takao IMAOKU, Kazuhiko TSUDA, Ikuko IMAJO, Yusuke KATAGIRI
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Patent number: 10180527Abstract: A backlight unit includes a light emission reflecting portion, first reflecting protrusions, and second reflecting protrusions. The light emission reflecting portion includes unit reflecting portions that include main reflecting surfaces and light reentering surfaces arranged opposite to the main reflecting surfaces, respectively. The first reflecting protrusions include extended main reflecting surfaces that continue to the main reflecting surfaces, respectively, and first auxiliary reflecting surfaces that reflect rays of light traveling toward an opposite plate surface and direct the rays of light toward the main reflecting surfaces and the extended main reflecting surfaces.Type: GrantFiled: February 19, 2015Date of Patent: January 15, 2019Assignee: SHARP KABUSHIKI KAISHAInventors: Ryuzo Yuki, Takeshi Ishida, Takao Imaoku, Yoshinobu Hirayama, Shugo Yagi
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Patent number: 9971081Abstract: A backlight unit includes LEDs, a light guide plate, a prism sheet, exiting light reflecting portions, prisms, concave lenticular lenses, and flat portions. The concave lenticular lenses are configured such that an occupancy rate of concave cylindrical lenses with respect to the second direction is higher in an area closer to a light entering surface with respect to the first direction and the occupancy rate is lower in an area farther from the light entering surface. The flat portions are formed adjacent to the concave cylindrical lenses with respect to the second direction such that an occupancy rate of flat portions with respect to the second direction is lower in an area closer to a light entering surface with respect to the first direction and the occupancy rate of the flat portions with respect to the second direction is higher in an area farther from the light entering surface.Type: GrantFiled: January 29, 2018Date of Patent: May 15, 2018Assignee: SHARP KABUSHIKI KAISHAInventors: Yoshinobu Hirayama, Takao Imaoku, Takeshi Ishida, Ryuzo Yuki, Shugo Yagi
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Patent number: 9915770Abstract: A backlight unit includes LEDs, a light guide plate, a prism sheet, exiting light reflecting portions, prisms, concave lenticular lens lenses, and flat portions. The concave lenticular lenses are configured such that an occupancy rate of concave cylindrical lenses with respect to the second direction is higher in an area closer to a light entering surface with respect to the first direction and the occupancy rate is lower in an area farther from the light entering surface. The flat portions are formed adjacent to the concave cylindrical lenses with respect to the second direction such that an occupancy rate of flat portions with respect to the second direction is lower in an area closer to a light entering surface with respect to the first direction and the occupancy rate of the flat portions with respect to the second direction is higher in an area farther from the light entering surface.Type: GrantFiled: July 22, 2015Date of Patent: March 13, 2018Assignee: Sharp Kabushiki KaishaInventors: Yoshinobu Hirayama, Takao Imaoku, Takeshi Ishida, Ryuzo Yuki, Shugo Yagi
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Publication number: 20180031897Abstract: A liquid crystal module which is disposed opposite a backlight includes: a first liquid crystal panel which includes a pair of first transparent substrates; a second liquid crystal panel which is disposed between the backlight and the first liquid crystal panel and includes a pair of second transparent substrates; and a diffuser sheet disposed therebetween. A first transparent substrate that is closer to the diffuser sheet among the pair of first transparent substrates is thinner than a second transparent substrate that is closer to the diffuser sheet among the pair of second transparent substrates.Type: ApplicationFiled: March 29, 2017Publication date: February 1, 2018Inventors: Katsuhiro KIKUCHI, Kazuhiko TSUDA, Takao IMAOKU, Yoichi YASUI
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Publication number: 20170363909Abstract: A lighting device includes LEDs 17, and a light guide plate 19 including an edge surface and a pair of plate surfaces, a part of the edge surface being a light entrance surface 19B through which light from the LEDs 17 enters, and one of the plate surfaces being a light exit surface 19A through which the light exits and another one of the plate surfaces being an opposite plate surface 19C opposite from the light exit surface 19A. The light guide plate 19 includes prism portions 51 on the opposite plate surface 19C, projecting from the opposite plate surface 19C and arranged in the X-axis direction and configured to collect light toward in a normal direction of the light exit surface 19A, and an exit light reflection portion 60 provided in a recessed portion 52 that is formed by two adjacent prism portions 51 and configured to reflect light travelling within the light guide plate 19 and facilitate exiting of light from the light guide plate 19.Type: ApplicationFiled: December 3, 2015Publication date: December 21, 2017Inventors: YOSHINOBU HIRAYAMA, TAKAO IMAOKU, SHUGO YAGI
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Publication number: 20170363798Abstract: A lighting device includes LEDs 17, a light guide plate 19, a reflection sheet 40, an exit light reflection portion 41 on a light exit surface 19a side of the light guide plate 19, opposite plate surface-side convex lenticular lens portions 44 and the flat portions 45 on the opposite plate surface 19c of the light guide plate 19. The occupied ratio of the opposite plate surface-side convex lenticular lens portions 44 with respect to the second direction is relatively low in a portion near the light entrance surface 19b in the first direction and is relatively high in a portion far away from the light entrance surface. The flat portions 45 have a relatively high occupied ratio to the opposite plate surface 19c with respect to the second direction in a portion near the light entrance surface 19b in the first direction and have a relatively low occupied ratio in a portion far away from the light entrance surface 19b.Type: ApplicationFiled: December 3, 2015Publication date: December 21, 2017Inventors: YOSHINOBU HIRAYAMA, TAKAO IMAOKU, SHUGO YAGI
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Publication number: 20170351142Abstract: A liquid crystal display device includes a light source, a light guide plate, a backlight unit, and a complex polarizing plate. The light guide plate includes light collecting portions to collect light rays exiting through a light exiting surface with respect to a direction perpendicular to an optical axis of the light source to direct the light rays in a frontward direction. The backlight unit includes an optical sheet to collect the light rays to direct the light rays in the frontward direction. The complex polarizing plate includes a selective reflecting sheet and a polarizing plate. The selective reflecting sheet includes a first transmission axis and a reflection axis perpendicular to the first transmission axis. The polarizing plate includes a second transmission axis. The complex polarizing plate is laid on the backlight unit with the first transmission axis and the second transmission axis perpendicular to the light collecting direction.Type: ApplicationFiled: December 17, 2015Publication date: December 7, 2017Inventors: TAKAO IMAOKU, YOSHINOBU HIRAYAMA, SHUGO YAGI
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Publication number: 20170329180Abstract: A lighting device includes LEDs 17, a light guide plate 19 including an edge surface and a pair of plate surfaces, a light reflection sheet 40, and a wavelength conversion sheet 50. A part of the edge surface is a light entrance surface 19B through which light from the LEDs 17 enters, and the pair of plate surfaces are light exit surfaces 19A, 19C through which the light exits. The light guide plate 19 includes second prism portions 65 formed on the light exit surface 19A and configured to collect light in a direction of a normal line of the light exit surface 19A. The light reflection sheet 40 is disposed to cover the light exit surface 19C reflects the light in a direction toward the light guide plate 19. The wavelength conversion sheet 50 is disposed between the light guide plate 19 and the light reflection sheet 40 and converts a wavelength of light transmitting therethrough.Type: ApplicationFiled: November 26, 2015Publication date: November 16, 2017Inventors: YOSHINOBU HIRAYAMA, TAKAO IMAOKU, SHUGO YAGI
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Publication number: 20170269285Abstract: A backlight device includes: LEDs; a light guide plate that has a light-receiving face, a light-exiting surface, and an opposite surface; a reflective sheet disposed so as to face the opposite surface of the light guide plate; and an exiting-light reflecting part that facilitates the emission of light from the light-exiting surface by reflecting light that propagates within the light guide plate, and that is disposed on the light-exiting surface side of the light guide plate. The exiting-light reflecting part is formed of a reflective unit disposed in plurality with gaps therebetween along a first direction, which is along a pair of end faces that are among the peripheral end faces of the light guide plate, are on opposite sides of the light guide plate, and do not include the light-receiving face. The reflective unit extends along a second direction, which is along a pair of end faces that are among the peripheral end faces of the light guide plate and that include the light-receiving face.Type: ApplicationFiled: July 22, 2015Publication date: September 21, 2017Applicant: Sharp Kabushiki KaishaInventors: Yoshinobu HIRAYAMA, Takao IMAOKU, Takeshi ISHIDA, Ryuzo YUKI, Shugo YAGI
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Patent number: 9728148Abstract: The color-field sequential liquid crystal display apparatus includes a liquid-crystal state value acquirer that acquires a liquid-crystal state value (a gradation value corresponding to the state of orientation of liquid crystal molecules) at the end of a displayed field on the basis of an input gradation value of the displayed field and the liquid-crystal state value at the end of a previous field (the first previous field of the displayed field) and an applied gradation value determiner that determines an applied gradation value of the displayed field by compensating the input gradation value of the displayed field on the basis of the liquid-crystal state value at the end of the previous field. The applied gradation value determiner determines the applied gradation value so that a display luminance in each field is a display luminance corresponding to the input gradation value.Type: GrantFiled: February 18, 2014Date of Patent: August 8, 2017Assignee: SHARP KABUSHIKI KAISHAInventors: Hidekazu Miyata, Takao Imaoku