Patents by Inventor Akira Tagawa
Akira Tagawa 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: 20090122055Abstract: A driving circuit of display device includes digital/current converting (DCC) circuits one for each data line. The DCC circuit operates to charge a capacitor with a reference current according to a supplied signal from a shift register. The DCC circuit stores a current value of the reference current and outputs it to a data line via a switching element that has been turned on by a digital image data signal (H) of a single line supplied from a line latch. The output value of each DCC circuit is reset one after another in every select scan period in which an OFF signal is sent to all the data lines. In this way, the reset of the output value and the output of the image data signal can be successively carried out within one frame period, enabling the data to be applied to the pixel circuit with the DCC circuits provided one for each data line. This simplifies the driving circuit that drives the pixel circuits provided with an electro-optic element and disposed in a matrix.Type: ApplicationFiled: December 23, 2008Publication date: May 14, 2009Applicant: Sharp Kabushiki KaishaInventors: Takahiro SENDA, Akira TAGAWA
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Patent number: 7515126Abstract: A driving circuit of display device includes digital/current converting (DCC) circuits one for each data line. The DCC circuit operates to charge a capacitor with a reference current according to a supplied signal from a shift register. The DCC circuit stores a current value of the reference current and outputs it to a data line via a switching element that has been turned on by a digital image data signal (H) of a single line supplied from a line latch. The output value of each DCC circuit is reset one after another in every select scan period in which an OFF signal is sent to all the data lines. In this way, the reset of the output value and the output of the image data signal can be successively carried out within one frame period, enabling the data to be applied to the pixel circuit with the DCC circuits provided one for each data line. This simplifies the driving circuit that drives the pixel circuits provided with an electro-optic element and disposed in a matrix.Type: GrantFiled: August 27, 2004Date of Patent: April 7, 2009Assignee: Sharp Kabushiki KaishaInventors: Takahiro Senda, Akira Tagawa
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Patent number: 7495389Abstract: An organic EL element includes a substrate, a plurality of first electrodes which are arranged on the substrate in a matrix configuration, a wall-like insulating layer which is formed on the substrate, organic light emitting layers which are formed on the first electrodes, respectively, an auxiliary electrode which is formed on top of the wall-like insulating layer and a second electrode which is formed to cover the surfaces of the wall-like insulating layer, the auxiliary electrode and the light emitting layers and electrically connected to the auxiliary electrode. The second electrode is transparent to light from the light emitting layers.Type: GrantFiled: June 21, 2005Date of Patent: February 24, 2009Assignee: Sharp Kabushiki KaishaInventors: Noboru Noguchi, Akira Tagawa
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Publication number: 20090045724Abstract: The present invention provides a light-emitting circuit board and a light-emitting display device, which can reduce a frame region (a space between a side of the board and a pixel region) on a board. The light-emitting circuit board of the present invention is a light-emitting circuit board comprising: on a board, a plurality of pixels each including a first electrode, a light-emitting layer, and a second electrode, stacked in this order; a driver circuit; and an external terminal, wherein the driver circuit is connected to the external terminal; the second electrode of the pixel and the external terminal are connected to each other by a wiring through an off-pixel contact; and the wiring is disposed to overlap with at least part of the driver circuit.Type: ApplicationFiled: January 26, 2006Publication date: February 19, 2009Applicant: SHARP KABUSHIKI KAISHAInventors: Akira Tagawa, Noboru Noguchi
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Publication number: 20080136795Abstract: In a pixel circuit Aij, a driver TFT Q1, a switching TFT Q3, and an OLED EL1 are connected in series between a power supply line Vp and a common cathode Vcom. A capacitor C1 is connected between the gate of the driver TFT Q1 and the voltage line Ui. The switching TFT Q2 is connected between the gate and drain of the driver TFT Q1. A capacitor C3 is connected between the drain of the driver TFT Q1 and a source line Sj.Type: ApplicationFiled: November 16, 2005Publication date: June 12, 2008Inventors: Takaji Numao, Akira Tagawa
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Publication number: 20060290855Abstract: A liquid crystal display apparatus includes: a pair of substrates opposing each other; a liquid crystal layer interposed between the pair of substrates, the liquid crystal layer containing liquid crystal molecules having a negative dielectric anisotropy; at least one electrode provided on each of the pair of substrates, the at least one electrode being used for applying an electric field across the liquid crystal layer; and at least one volume excluding member. One of the at least one volume excluding member is provided on the at least one electrode on at least one of the pair of substrates, the volume excluding member being provided so as to be on at least a portion of one side edge of the at least one electrode. A side of each of the pair of substrates facing the liquid crystal layer is subjected to a vertical alignment treatment.Type: ApplicationFiled: August 31, 2006Publication date: December 28, 2006Applicant: Sharp Kabushiki KaishaInventors: Nobuyuki Itoh, Akira Tagawa, Masaaki Kabe, Tomoo Furukawa
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Patent number: 7046220Abstract: A display in accordance with the present invention includes: photoelectric elements as pixels; scan signal lines for sequentially driving the photoelectric elements; video data signal lines for supplying video data signals to the photoelectric elements; and drive-switching elements, each provided for a different photoelectric element, for supplying, to the photoelectric elements, currents matching with the video data signals supplied from the video data signal lines, and further includes path selector switching elements, connected to the respective drive-switching elements, for selecting one of current injecting paths according to a scan signal from the scan signal lines, and a current measuring circuit to either one of the current injecting paths.Type: GrantFiled: October 29, 2002Date of Patent: May 16, 2006Assignee: Sharp Kabushiki KaishaInventors: Akira Tagawa, Takaji Numao
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Publication number: 20060017375Abstract: An organic EL element includes a substrate, a plurality of first electrodes which are arranged on the substrate in a matrix configuration, a wall-like insulating layer which is formed on the substrate, organic light emitting layers which are formed on the first electrodes, respectively, an auxiliary electrode which is formed on top of the wall-like insulating layer and a second electrode which is formed to cover the surfaces of the wall-like insulating layer, the auxiliary electrode and the light emitting layers and electrically connected to the auxiliary electrode. The second electrode is transparent to light from the light emitting layers.Type: ApplicationFiled: June 21, 2005Publication date: January 26, 2006Inventors: Noboru Noguchi, Akira Tagawa
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Patent number: 6927766Abstract: An image display apparatus comprises a display section including picture elements for modulating light transmission or reflection, a driving section for performing an addressing scan of the picture elements in such a manner as to successively change light modulation states of the picture elements in each display frame, and a light emitting section for illuminating the display section. The light emitting section is switched ON-OFF once in each display frame, the addressing scan for the picture elements is performed in the OFF state of the light emitting section in each display frame, and the sequence of the addressing scan is reversed every one or more display frames.Type: GrantFiled: August 7, 2001Date of Patent: August 9, 2005Assignee: Sharp Kabushiki KaishaInventors: Akira Tagawa, Masaaki Kabe
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Publication number: 20050046619Abstract: A driving circuit of display device includes digital/current converting (DCC) circuits one for each data line. The DCC circuit operates to charge a capacitor with a reference current according to a supplied signal from a shift register. The DCC circuit stores a current value of the reference current and outputs it to a data line via a switching element that has been turned on by a digital image data signal (H) of a single line supplied from a line latch. The output value of each DCC circuit is reset one after another in every select scan period in which an OFF signal is sent to all the data lines. In this way, the reset of the output value and the output of the image data signal can be successively carried out within one frame period, enabling the data to be applied to the pixel circuit with the DCC circuits provided one for each data line. This simplifies the driving circuit that drives the pixel circuits provided with an electro-optic element and disposed in a matrix.Type: ApplicationFiled: August 27, 2004Publication date: March 3, 2005Applicant: SHARP KABUSHIKI KAISHAInventors: Takahiro Senda, Akira Tagawa
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Publication number: 20040017484Abstract: Sound inputted via a sound input section is recorded in a memory via a DSP. The sound recorded in the memory is reproduced by a sound output section. A camera section photographs a subject, and records still image data of the subject in the memory. A mode transfer control section turns off a switch to partially stop a power supply to each section of the recording/reproducing apparatus and sets an operation mode of the apparatus to a standby mode, when the operation of the recording/reproducing apparatus stops and a stop state continues for a predetermined time. When any button of the operation section is pressed in the standby mode, the switch is turned on, the power supply stopped in the standby mode is resumed, and a process such as still image recording is executed in accordance with the pressed button.Type: ApplicationFiled: June 3, 2003Publication date: January 29, 2004Applicant: Kabushiki Kaisha ToshibaInventor: Akira Tagawa
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Publication number: 20030090446Abstract: A display in accordance with the present invention includes: photoelectric elements as pixels; scan signal lines for sequentially driving the photoelectric elements; video data signal lines for supplying video data signals to the photoelectric elements; and drive-switching elements, each provided for a different photoelectric element, for supplying, to the photoelectric elements, currents matching with the video data signals supplied from the video data signal lines, and further includes path selector switching elements, connected to the respective drive-switching elements, for selecting one of current injecting paths according to a scan signal from the scan signal lines, and a current measuring circuit to either one of the current injecting paths.Type: ApplicationFiled: October 29, 2002Publication date: May 15, 2003Inventors: Akira Tagawa, Takaji Numao
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Publication number: 20020044116Abstract: An image display apparatus comprises a display section including picture elements for modulating light transmission or reflection, a driving section for performing an addressing scan of the picture elements in such a manner as to successively change light modulation states of the picture elements in each display frame, and a light emitting section for illuminating the display section. The light emitting section is switched ON-OFF once in each display frame, the addressing scan for the picture elements is performed in the OFF state of the light emitting section in each display frame, and the sequence of the addressing scan is reversed every one or more display frames.Type: ApplicationFiled: August 7, 2001Publication date: April 18, 2002Inventors: Akira Tagawa, Masaaki Kabe
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Publication number: 20010019390Abstract: A liquid crystal display apparatus includes: a pair of substrates opposing each other; a liquid crystal layer interposed between the pair of substrates, the liquid crystal layer containing liquid crystal molecules having a negative dielectric anisotropy; at least one electrode provided on each of the pair of substrates, the at least one electrode being used for applying an electric field across the liquid crystal layer; and at least one volume excluding member. One of the at least one volume excluding member is provided on the at least one electrode on at least one of the pair of substrates, the volume excluding member being provided so as to be on at least a portion of one side edge of the at least one electrode. A side of each of the pair of substrates facing the liquid crystal layer is subjected to a vertical alignment treatment.Type: ApplicationFiled: December 20, 2000Publication date: September 6, 2001Inventors: Nobuyuki Itoh, Akira Tagawa, Masaaki Kabe, Tomoo Furukawa
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Patent number: 6271820Abstract: A light modulating device comprises a plurality of data electrodes, a plurality of strobe electrodes, pixels at the intersections of the strobe and data electrodes, and addressing means for supplying data signals to the data electrodes in successive data selection periods and for supplying strobe signals to the strobe electrodes to set the transmission levels of the pixels in dependence on the data signals supplied to the pixels during each data selection period. Each pixel comprises a pair of subelements, and the addressing means is arranged to address the subelements of the pair by 1:3 spatial dither and to supply different strobe signals to each of the subelements during different bits of 1:1 spatial or temporal dither within the same data selection period. The transmission level of each subelement is determined by the data signal applied to the subelement in the data selection period in association with the strobe signal applied to the corresponding spatial or temporal dither bit.Type: GrantFiled: May 15, 1998Date of Patent: August 7, 2001Inventors: Harald Reinhart Bock, Paul Bonnett, Michael John Towler, Diana Cynthia Ulrich, Akira Tagawa
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Patent number: 6232943Abstract: Given a natural number “n”, then, in the first frame of continuous two frames, strobe pulses of opposite polarities are applied respectively to a scanning electrode L2n−1 in a (2n−1)'th line and a scanning electrode L2n in a 2n'th line during a selection period. In the second frame, strobe pulses of opposite polarities are applied respectively to the scanning electrode L2n in the 2n'th line and a scanning electrode L2n+1 in a (2n+1)'th line during a selection period.Type: GrantFiled: March 18, 1998Date of Patent: May 15, 2001Assignees: Sharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kindgom of Great Britain and Northern IrelandInventors: Akira Tagawa, Keisaku Nonomura, Paul Bonnett, Michael John Towler
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Patent number: 6215533Abstract: A ferroelectric liquid crystal device includes a layer of ferroelectric liquid crystal material contained between a pair of substrates, a first plurality of electrodes and a second plurality of electrodes defining a plurality of addressable liquid crystal pixels. A driving arrangement is provided for applying a first signal (Strobe) in succession to the first plurality of electrodes and for applying a plurality of second signals (Data) simultaneously to the second plurality of electrodes. The plurality of second signals are arranged to include non-rectangular wave signals which have a lower harmonic content than a rectangular wave. Non-uniform heating of the device as a result of the application of the second signals (Data) is reduced with consequent improvement in device performance.Type: GrantFiled: May 12, 1997Date of Patent: April 10, 2001Assignee: Sharp Kabushiki KaishaInventors: Mitsuhiro Shigeta, Jonathan Rennie Hughes, Paul Bonnett, Edward Peter Raynes, Akira Tagawa, Michael John Towler, Harry Garth Walton, David Scattergood
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Patent number: 6137463Abstract: A ferroelectric liquid crystal display comprises data electrodes and strobe electrodes which are connected to data and signal generators. The strobe signal generator supplies strobe signals sequentially to groups of more than one strobe electrode. For instance, the strobe electrodes may be strobed in pairs with the strobe signals being supplied simultaneously to the electrodes of each pair. The data signal generator supplies any of a plurality of different data signals to each of the data electrodes in synchronism with the strobe signals. The data signals are such that all combinations of optical states for the pixels which are connected to the same data electrode and which are strobed simultaneously can be achieved.Type: GrantFiled: May 28, 1998Date of Patent: October 24, 2000Assignee: Sharp Kabushiki KaishaInventors: Akira Tagawa, Paul Bonnett, Michael John Towler
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Patent number: 6075506Abstract: A display such as a ferroelectric liquid crystal display includes a matrix of pixels, for instance formed at the intersections of data electrodes and strobe electrodes. In order to address an intermediate grey level, each pixel is switched from the normally black mode to the grey level in odd frames and from the normally white mode to the grey level in even frames. Variations in the grey levels, for instance caused by temperature variations, act in opposite directions so that the average grey level over time of the pixel varies relatively little.Type: GrantFiled: February 18, 1997Date of Patent: June 13, 2000Assignee: Sharp Kabushiki KaishaInventors: Paul Bonnett, Michael John Towler, Akira Tagawa
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Patent number: 6061043Abstract: A liquid crystal display which includes a matrix of pixels, for instance formed at the intersections of data electrodes and split strobe electrodes. Each pixel is divided into first and second sub-pixels. The first sub-pixels have input and output polarisers whose polarization directions are parallel, whereas the second sub-pixels have input and output polarisers whose polarization directions are orthogonal. In order to address and achieve grey levels with reduced variations due to temperature variations and liquid crystal variations, the sub-pixels are switched to a grey level in accordance with a spatial averaging technique. Variations in the grey levels of the sub-pixels, for instance caused by temperature variations, act in opposite directions so that the average grey level of the whole pixel varies relatively little.Type: GrantFiled: February 18, 1997Date of Patent: May 9, 2000Assignee: Sharp Kabushiki KaishaInventors: Paul Bonnett, Michael John Towler, Akira Tagawa