Patents by Inventor Tadahiko Hirai
Tadahiko Hirai 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: 20180330662Abstract: A light-emitting sub-pixel circuit for a display panel that allows correction of variations in switching elements and correction of degradation in a three-terminal light-emitting element, a drive method, a display panel using the sub-pixel circuit and method. The light-emitting sub-pixel circuit includes at least two switching elements, at least one capacitor, a three-terminal light-emitting element, a power line for supplying electric power to the three-terminal light-emitting element, a ground line, a scan line for selecting a sub-pixel for light emission, and a data line for supplying data to the three-terminal light-emitting element, each of the power line, the ground line, the scan line, and the data line serving as a conduit for making a connection among the elements wherein data corresponding to a predetermined luminous intensity are programmed on the basis of voltage and a correction voltage different from a programmed voltage is applied to the three-terminal light-emitting element.Type: ApplicationFiled: November 20, 2015Publication date: November 15, 2018Inventors: Tadahiko Hirai, Kazunori Ueno
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Patent number: 9922595Abstract: A pixel structure for use in a high-definition light-emitting display panel having a plurality of sub-pixels, comprising: a glass substrate; a backplane that is disposed on the glass substrate and includes a capacitive element having sufficiently high light transmittance to cause 50 percent or more of light to be transmitted therethrough; a frontplane that is disposed on the backplane and includes a light-emitting element disposed so as to radiate light towards the glass substrate and the backplane; an electrical connecting portion that provides an electrical connection between the frontplane and the backplane, three or fewer of such electrical connecting portions being provided on one of the sub-pixels; and a switching element that is provided on the backplane and controls electricity distribution to the light-emitting element, wherein an aperture ratio from which light is transmitted through the glass substrate is 20 percent or more.Type: GrantFiled: May 5, 2015Date of Patent: March 20, 2018Assignee: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATIONInventors: Tadahiko Hirai, Kazunori Ueno
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Patent number: 9882171Abstract: An electroluminescent device comprising: an organic electroluminescent element and a junction transistor having a first region, a second region, and an intermediate semiconducting region configured to control flow of charge between the first and second regions, wherein at least two abutting regions consist essentially of one or more semiconducting inorganic metal compounds, and wherein each region of the junction transistor and the electroluminescent element are successively stacked along a common direction.Type: GrantFiled: June 6, 2014Date of Patent: January 30, 2018Assignee: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATIONInventors: Tadahiko Hirai, Kazunori Ueno, Brett Alexander Sexton
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Publication number: 20170186368Abstract: A pixel structure for use in a high-definition light-emitting display panel having a plurality of sub-pixels, comprising: a glass substrate; a backplane that is disposed on the glass substrate and includes a capacitive element having sufficiently high light transmittance to cause 50 percent or more of light to be transmitted therethrough; a frontplane that is disposed on the backplane and includes a light-emitting element disposed so as to radiate light towards the glass substrate and the backplane; an electrical connecting portion that provides an electrical connection between the frontplane and the backplane, three or fewer of such electrical connecting portions being provided on one of the sub-pixels; and a switching element that is provided on the backplane and controls electricity distribution to the light-emitting element, wherein an aperture ratio from which light is transmitted through the glass substrate is 20 percent or more.Type: ApplicationFiled: May 5, 2015Publication date: June 29, 2017Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATIONInventors: Tadahiko HIRAI, Kazunori UENO
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Publication number: 20170084229Abstract: A light-emitting display panel sub-pixel circuit, comprising: at least three switches; at least one capacitive element; at least one light-emitting element; a power line serving as a wire for connecting the at least three switches, the at least one capacitive element, and the at least one light-emitting element; an earth line; a scan line for selecting a sub-pixel for light emission; a data line for supplying data to the light-emitting element; and a sense line for detecting degradation of the light-emitting element, wherein the data corresponding to a predetermined luminous intensity are programmed on the basis of a voltage.Type: ApplicationFiled: May 19, 2015Publication date: March 23, 2017Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATIONInventors: Tadahiko Hirai, Kazunori Ueno
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Publication number: 20160126504Abstract: An electroluminescent device comprising: an organic electroluminescent element and a junction transistor having a first region, a second region, and an intermediate semiconducting region configured to control flow of charge between the first and second regions, wherein at least two abutting regions consist essentially of one or more semiconducting inorganic metal compounds, and wherein each region of the junction transistor and the electroluminescent element are successively stacked along a common direction.Type: ApplicationFiled: June 6, 2014Publication date: May 5, 2016Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATIONInventors: Tadahiko Hirai, Kazunori Ueno, Brett Alexander Sexton
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Patent number: 8937303Abstract: An organic electroluminescent device comprising: a pair of electrodes comprising an anode and a cathode, and one or more layers of organic compound arranged between the pair of electrodes, wherein the organic compound layer, or one or more of the organic compound layers, comprises a compound represented by a substituted imidazole. The substituents on the imidazole ring may be selected from a range of suitable substituents, including: substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted alkyl groups or cyano groups. In various aspects of the invention, at least one of the substituent groups may be a substituted or unsubstituted imidazole or thiophene group.Type: GrantFiled: October 21, 2011Date of Patent: January 20, 2015Assignee: Commonwealth Scientific and Industrial Research OrganisationInventors: James Matthew MacDonald, Kazunori Ueno, Karl Peter Weber, Tadahiko Hirai, Juo-Hao Li
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Patent number: 8643570Abstract: An active matrix organic electroluminescence(EL) display comprises plural selection and data lines mutually crossed, and a pixel circuit connected to the selection and data lines and having switching devices, a storage capacitor and an organic EL device. In a part of a period that the pixel circuit connected to the selection line is being selected, an applied first data signal is held as a voltage at the storage capacitor of the selected pixel circuit. After the selection signal applying, a first current according to the held voltage is supplied to the organic EL device, and this emits light at luminance according to the first current. In another part of the period, a second current according to an applied second data signal is supplied to the organic EL device of the selected pixel circuit, and this emits light at luminance according to the second current.Type: GrantFiled: June 25, 2008Date of Patent: February 4, 2014Assignee: Canon Kabushiki KaishaInventors: Kaoru Okamoto, Tadahiko Hirai, Jun Sumioka
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Publication number: 20130264554Abstract: An organic electroluminescent device comprising: a pair of electrodes comprising an anode and a cathode, and one or more layers of organic compound arranged between the pair of electrodes, wherein the organic compound layer, or one or more of the organic compound layers, comprises a compound represented by a substituted imidazole. The substituents on the imidazole ring may be selected from a range of suitable substituents, including: substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted alkyl groups or cyano groups. In various aspects of the invention, at least one of the substituent groups may be a substituted or unsubstituted imidazole or thiophene group.Type: ApplicationFiled: October 21, 2011Publication date: October 10, 2013Inventors: James Matthew MacDonald, Kazunori Ueno, Karl Peter Weber, Tadahiko Hirai, Juo-Hao Li
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Patent number: 8395613Abstract: A display apparatus includes a plurality of pixels disposed in a matrix pattern, each of the pixels emitting light, an acquisition unit for acquiring degradation characteristics of an emission luminance of each pixel from a video signal or a signal output from the pixel, and a detection unit for detecting a boundary of pixels showing different degradation characteristics of the plurality of pixels based on the degradation characteristics acquired by the acquisition unit. A calculation unit calculates a correction amount of the video signal to the pixels in a periphery of the boundary such that the emission luminance is gently varied in the periphery of the boundary when the plurality of pixels in the periphery of the boundary detected by the detection unit are caused to emit light with a same video signal. In addition, a correction unit corrects the video signal based on the calculated correction amount, and a video image is displayed by the plurality of pixels based on the corrected video signal.Type: GrantFiled: June 29, 2009Date of Patent: March 12, 2013Assignee: Canon Kabushiki KaishaInventors: Kaoru Okamoto, Jun Sumioka, Tadahiko Hirai
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Publication number: 20120261650Abstract: An organic electroluminescent device comprising: a pair of electrodes comprising an anode and a cathode, and one or more layers arranged between the anode and the cathode; wherein at least one of the one or more layers is a light emitting layer and wherein the one or more layers, comprises an organic compound represented by a substituted 2,2?-biimidazole.Type: ApplicationFiled: October 21, 2011Publication date: October 18, 2012Applicant: Commonwealth Scientific and Industrial Research OrganisationInventors: James Matthew MacDonald, Mark Bown, Kazunori Ueno, Karl Peter Weber, Jenny Lee O'Connell, Tadahiko Hirai
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Patent number: 8228271Abstract: An active-matrix display includes a data line, at least one select line, a control unit supplying a voltage signal and a current signal to the data line, and a pixel circuit receiving the voltage signal and the current signal from the data line to drive a light emitting element, the control unit including a voltage or first current source supplying a voltage or current pulse to the data line in order to make the voltage holding unit hold the voltage signal for making the light emitting element emit light having predetermined brightness in a first selection period in which the first switch is closed, a second current source supplying the current signal for making the light emitting element emit light having the predetermined brightness to the data line in a second selection period in which the first switch and the second switch are closed, a detection circuit detecting potential held in the voltage holding unit in the second selection period, and a correction unit correcting the voltage signal based on a relatType: GrantFiled: May 21, 2008Date of Patent: July 24, 2012Assignee: Canon Kabushiki KaishaInventors: Tadahiko Hirai, Jun Sumioka, Kaoru Okamoto
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Patent number: 8179343Abstract: A display apparatus includes a scanning line, a signal line, and a pixel circuit. The pixel circuit is selected according to a signal applied to the scanning line, and a signal is input to the selected pixel circuit from the signal line. The pixel circuit include a holding capacitor, a first switch which opens and closes connection between one terminal of the light emitting element and the signal line in accordance with a signal applied to the scanning line, and a second switch which opens and closes connection between one terminal of the holding capacitor and the signal line in accordance with a signal applied to the scanning line.Type: GrantFiled: June 13, 2008Date of Patent: May 15, 2012Assignee: Canon Kabushiki KaishaInventors: Jun Sumioka, Kaoru Okamoto, Tadahiko Hirai
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Publication number: 20120091884Abstract: The present invention relates to an organic electroluminescent device comprising a pair of electrodes forming an anode and cathode, and one or more layers of organic compound arranged between the pair of electrodes, wherein the organic compound layer comprises heptaazaphenalene derivatives of formula (1). The present invention also relates to the said compounds.Type: ApplicationFiled: May 21, 2010Publication date: April 19, 2012Applicant: Commonwealth Scientific and Industrial Research OrganisationInventors: James Matthew Macdonald, Raju Adhikari, Almar Postma, Tadahiko Hirai, Kazunori Ueno
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Patent number: 8043000Abstract: A temperature-history sensor includes a resonance circuit composed of at least a capacitor and a coil. The temperature-history sensor has a display for indicating a predetermined set temperature of the temperature-history sensor. The capacitor has at least a thermofusion material between electrodes of the capacitor, and the melting point of the thermofusion material is in the region of the set temperature.Type: GrantFiled: September 21, 2009Date of Patent: October 25, 2011Assignee: Canon Kabushiki KaishaInventors: Takayuki Sumida, Tadahiko Hirai
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Patent number: 7817043Abstract: The present invention provides an RF tag which does not have an integrated circuit such as a silicon chip, can retain a plurality of information, can rewrite or add the information, and is inexpensive. The RF tag includes an RF resonance circuit which has at least two capacitors connected in series or parallel and at least one coil antenna formed on a substrate, wherein at least one of the capacitors is an anti-fuse which irreversibly short-circuits when a voltage higher than a threshold voltage is applied to the anti-fuse, and the surface of an electrode constituting the capacitor has a mean roughness of 1 ?m or less.Type: GrantFiled: November 22, 2005Date of Patent: October 19, 2010Assignee: Canon Kabushiki KaishaInventors: Tadahiko Hirai, Takayuki Sumida
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Patent number: 7791569Abstract: A light emitting element circuit includes a current minor circuit having two thin film transistors, two current input terminals, and two output terminals, a capacitor for holding voltage in accordance with an electric current to be input from one of the two current input terminals, and a light emitting element connected to the current minor circuit. An electric current is supplied to the light emitting element through the current mirror circuit in accordance with the voltage held in the capacitor. The two output terminals of the current mirror circuit are connected to the light emitting element, and the two current input terminals of the current minor circuit are connected with each other through a switch in a time period other than a time period during which an electric current is input from the one of the two current input terminals.Type: GrantFiled: May 27, 2008Date of Patent: September 7, 2010Assignee: Canon Kabushiki KaishaInventor: Tadahiko Hirai
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Patent number: 7696883Abstract: In a resonance tag provided with a resonance circuit composed of a capacitive element and an inductive element, the capacitive element is characterized by having a condition under which the capacitance of the capacitive element is reversibly changed by a voltage applied to the resonance circuit and anther condition under which the capacitance of the capacitive element is irreversibly changed by another voltage applied to the resonance circuit.Type: GrantFiled: January 16, 2006Date of Patent: April 13, 2010Assignee: Canon Kabushiki KaishaInventors: Takayuki Sumida, Tadahiko Hirai
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Patent number: 7696530Abstract: A sensor includes a first gate electrode, a second gate electrode, a semiconductor layer, a gate-insulating layer, a source electrode, a drain electrode, and a sensing portion including an accommodating part and a receiving layer. The first and second gate electrodes are opposed to each other with the sensing portion, the semiconductor layer, and the gate-insulating layer therebetween. One surface of the semiconductor layer is in contact with a surface of the sensing portion, and another surface of the semiconductor layer is in contact with the gate-insulating layer. A surface of the gate-insulating layer is in contact with the second gate electrode. The first gate electrode and the receiving layer are opposed to each other with the accommodating part therebetween. The source and drain electrodes are in contact with the semiconductor layer.Type: GrantFiled: June 8, 2007Date of Patent: April 13, 2010Assignee: Canon Kabushiki KaishaInventors: Tetsushi Yamamoto, Tadahiko Hirai, Shunji Imanaga
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Publication number: 20100073265Abstract: An active-matrix display includes a data line, at least one select line, a control unit supplying a voltage signal and a current signal to the data line, and a pixel circuit receiving the voltage signal and the current signal from the data line to drive a light emitting element, the control unit including a voltage or first current source supplying a voltage or current pulse to the data line in order to make the voltage holding unit hold the voltage signal for making the light emitting element emit light having predetermined brightness in a first selection period in which the first switch is closed, a second current source supplying the current signal for making the light emitting element emit light having the predetermined brightness to the data line in a second selection period in which the first switch and the second switch are closed, a detection circuit detecting potential held in the voltage holding unit in the second selection period, and a correction unit correcting the voltage signal based on a relatType: ApplicationFiled: May 21, 2008Publication date: March 25, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Tadahiko Hirai, Jun Sumioka, Kaoru Okamoto