Patents by Inventor Kenta Kajiyama
Kenta Kajiyama 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: 20160141341Abstract: A sub-pixel is provided in a display area of an organic EL display device. A bank layer surrounds an outer periphery of the sub-pixel. A contact area is positioned in the display area and is adjacent to the sub-pixel through the bank layer. A pixel electrode is provided in the sub-pixel. A common electrode is disposed across the sub-pixel and the contact area. At least a part of an auxiliary conductive layer is positioned in the contact area. A contact hole is provided in the contact area and electrically connects the common electrode and the auxiliary conductive layer.Type: ApplicationFiled: November 12, 2015Publication date: May 19, 2016Inventors: Kenta KAJIYAMA, Toshihiro SATO
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Patent number: 9235999Abstract: A display device includes a plurality of pixels each including a mechanical shutter. The display device electrically controls the position of the mechanical shutter to provide image display. Each of the pixels includes a pixel circuit for electrically controlling the position of the mechanical shutter. The pixel circuit includes a first control electrode and a second control electrode provided as a pair with respect to the mechanical shutter; a first mean for applying a prescribed control voltage to the first control electrode and the second control electrode to put the mechanical shutter and the first control electrode or the second control electrode into contact with each other; and a second mean for, in a state where the mechanical shutter is at a stop, decreasing a potential difference between the mechanical shutter and the first control electrode or the second control electrode which is in contact with the mechanical shutter.Type: GrantFiled: December 24, 2012Date of Patent: January 12, 2016Assignee: Pixtronix, Inc.Inventors: Hajime Akimoto, Takahiko Muneyoshi, Kenta Kajiyama
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Publication number: 20160005361Abstract: [PROBLEM] To provide substantially the same voltage to a shutter electrode and a pair of control electrodes, and to prevent degradation of the mechanical shutter, during a discharge period in a movable shutter system in an image display device.Type: ApplicationFiled: March 21, 2014Publication date: January 7, 2016Applicant: Pixtronix, Inc.Inventors: Kenta Kajiyama, Katsumi Matsumoto, Hideki Nakagawa, Takahide Kuranaga, Takeomi Morita
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Patent number: 9013523Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an endpoint of the one frame period in accordance with an increase of the gray level.Type: GrantFiled: May 15, 2014Date of Patent: April 21, 2015Assignee: Pixtronix, Inc.Inventors: Kenta Kajiyama, Hajime Akimoto
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Patent number: 8994635Abstract: The invention provides an image display device capable of reducing the transmission delay of a scanning signal. A plurality of scanning signal lines are wired in one pixel circuit row. Pixel circuits of the pixel circuit row are connected to any of the plurality of scanning signal lines.Type: GrantFiled: June 5, 2009Date of Patent: March 31, 2015Assignees: Japan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Kenta Kajiyama, Takeshi Izumida, Norihiro Nakamura, Naoki Tokuda
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Publication number: 20140247293Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an endpoint of the one frame period in accordance with an increase of the gray level.Type: ApplicationFiled: May 15, 2014Publication date: September 4, 2014Applicant: PIXTRONIX, INC.Inventors: Kenta KAJIYAMA, Hajime AKIMOTO
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Publication number: 20140204132Abstract: A display device includes: a light emission control part which allows a light source to emit the light having one of the plural different main wavelengths in each of plural sub frames; a display panel which controls the transmission of light in each pixel; and a display control part which controls the display panel corresponding to a gray level value with respect to the each pixel, wherein the light emitting control part performs the light emission of light having a first main wavelength in a first sub frame in accordance with a light emission amount weighted based on a time for calculation including a first interval which is a interval between the first sub frame where the first main wavelength is emitted and a second sub frame where the first main wavelength is emitted after the first sub frame.Type: ApplicationFiled: March 21, 2014Publication date: July 24, 2014Applicant: Pixtronix, Inc.Inventors: Hajime AKIMOTO, Kenta KAJIYAMA
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Patent number: 8730279Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into: a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an end point of the one frame period in accordance with an increase of the gray level.Type: GrantFiled: May 14, 2012Date of Patent: May 20, 2014Assignee: Pixtronix, Inc.Inventors: Kenta Kajiyama, Hajime Akimoto
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Patent number: 8723900Abstract: A display device includes: a light emission control part which allows a light source to emit the light having one of the plural different main wavelengths in each of plural sub frames; a display panel which controls the transmission of light in each pixel; and a display control part which controls the display panel corresponding to a gray level value with respect to the each pixel, wherein the light emitting control part performs the light emission of light having a first main wavelength in a first sub frame in accordance with a light emission amount weighted based on a time for calculation including a first interval which is a interval between the first sub frame where the first main wavelength is emitted and a second sub frame where the first main wavelength is emitted after the first sub frame.Type: GrantFiled: May 14, 2012Date of Patent: May 13, 2014Assignee: Pixtronix, Inc.Inventors: Hajime Akimoto, Kenta Kajiyama
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Patent number: 8441186Abstract: An organic electroluminescence display device is disclosed wherein plural organic electroluminescence elements each having an anode, a cathode and an organic layer sandwiched in between the anode and the cathode, the plural organic electroluminescence elements including organic electroluminescence elements developing different colors in a row direction, and at least one of the organic layers having an outer edge of a conic section at an end portion in a column direction thereof, the outer edge of the conic section becoming narrower gradually in its width in a row direction of vapor deposition thereof toward an extreme end at an end portion in a column direction thereof. The organic electroluminescence display device can improve the vapor deposition accuracy and the degree of design freedom.Type: GrantFiled: April 29, 2010Date of Patent: May 14, 2013Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Noriharu Matsudate, Takeshi Ookawara, Kenta Kajiyama
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Patent number: 8330711Abstract: A plurality of data signal lines each of which is connected to at least one pixel circuit in one pixel circuit column and is not connected to the pixel circuits of other pixel circuit columns are provided to one pixel circuit column, and the pixel circuits in the pixel circuit column are connected to any one of the plurality of data signal lines. An image display device having such a constitution can alleviate lowering of display quality attributed to transmission delay or voltage drop of a scanning signal.Type: GrantFiled: September 1, 2009Date of Patent: December 11, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystal Display Co., Ltd.Inventors: Kenta Kajiyama, Takeshi Izumida, Norihiro Nakamura
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Publication number: 20120293572Abstract: A display device includes: a light emission control part which allows a light source to emit the light having one of the plural different main wavelengths in each of plural sub frames; a display panel which controls the transmission of light in each pixel; and a display control part which controls the display panel corresponding to a gray level value with respect to the each pixel, wherein the light emitting control part performs the light emission of light having a first main wavelength in a first sub frame in accordance with a light emission amount weighted based on a time for calculation including a first interval which is a interval between the first sub frame where the first main wavelength is emitted and a second sub frame where the first main wavelength is emitted after the first sub frame.Type: ApplicationFiled: May 14, 2012Publication date: November 22, 2012Inventors: Hajime AKIMOTO, Kenta Kajiyama
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Publication number: 20120293563Abstract: A display device which includes a light source which independently emits light of three colors of RGB, and an emission control unit which controls the light source to continuously emit one of principal wavelength light beams of three RGB light beams in each of the sub-frames, in which the emission control unit controls a Green light as one of the plural principal wavelengths among light beams of three RGB colors to be emitted in the sub-frame which is arranged at the same position in the one frame period of both an odd frame as the odd numbered single frame period and an even frame as the even numbered single frame period, and controls light of the R color and the B color to be emitted in different sub-frames between the odd frames and the even frames.Type: ApplicationFiled: May 14, 2012Publication date: November 22, 2012Inventors: Hajime Akimoto, Kenta Kajiyama
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Publication number: 20120293564Abstract: Provided are a display device that can suppress occurrence of a color breakup as well as occurrence of a false contour, and a control method therefor. In the display device, a plurality of sub-frame periods forming one frame period are divided into: a first group to which sub-frame periods with the same length of light transmission periods belong; and a second group to which sub-frame periods with lengths of light transmission periods shorter than those of the sub-frame periods in the first group and different from each other belong. Further, among the sub-frame periods that belong to the first group, sub-frame periods having the light transmission period increase in number from a middle of the one frame period toward a start point and an end point of the one frame period in accordance with an increase of the gray level.Type: ApplicationFiled: May 14, 2012Publication date: November 22, 2012Inventors: Kenta KAJIYAMA, Hajime Akimoto
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Publication number: 20120105501Abstract: An image display device includes: a light-emitting element that emits light corresponding to an amount of current in an emission period; a storage capacitor to which a display potential is supplied to one end thereof before the emission period and which stores a voltage corresponding to the display potential; a driving transistor that adjusts an amount of current flowing in a drain electrode thereof in accordance with the voltage stored by the storage capacitor; a lighting control switch which is connected in series with the light-emitting element from the drain electrode of the driving transistor and which is turned on in the emission period; and a discharge switch that connects a node in a current path from the driving transistor to the light-emitting element, through which a current flows when the lighting control switch is turned on, to a wiring that supplies a discharge potential before the emission period.Type: ApplicationFiled: October 26, 2011Publication date: May 3, 2012Inventors: Norihiro NAKAMURA, Kenta KAJIYAMA, Hajime AKIMOTO, Kouji IKEDA
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Patent number: 8148896Abstract: The present invention provides an organic electroluminescent display device and a method of repairing a defective pixel of an organic electroluminescent display device which can realize the repairing a defective pixel to a light emitting pixel by electrically separating a leak portion which generates a defective pixel. To be more specific, a peeling suppression layer is formed between an anode and an organic light emitting layer formed on a main substrate, and a cavity is formed between the main substrate and the peeling suppression layer due to the evaporation generated by an absorption of laser beams thus electrically separating a defective portion so as to repair a black-dot defective pixel to form a light emitting pixel.Type: GrantFiled: March 2, 2010Date of Patent: April 3, 2012Assignees: Hitachi Displays, Ltd., Panasonic Liquid Crystals Display Co., Ltd.Inventors: Kenta Kajiyama, Toshihiro Sato, Naoki Tokuda
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Publication number: 20120050252Abstract: An nMOS is used for a drive TFT and a display device is provided without being affected by variations in the threshold voltage of the drive TFT. A display device includes: a field-effect transistor that controls a drive current of a light emitting element; a first switch provided between a source of the field-effect transistor and an anode terminal of the light emitting element; a second switch provided between the source of the field-effect transistor and a signal line; a third switch provided between a drain of the field-effect transistor and a power supply line; a fourth switch provided between the drain and a gate of the field-effect transistor; a capacitor provided between the gate of the field-effect transistor and the anode terminal of the light emitting element; and a fifth switch provided between the anode terminal of the light emitting element and a predetermined voltage supply line.Type: ApplicationFiled: August 11, 2011Publication date: March 1, 2012Inventors: Hajime Akimoto, Masahisa Tsukahara, Kenta Kajiyama
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Publication number: 20110310137Abstract: The present invention provides an image display device comprising data lines each supplying a data signal, and a plurality of pixel circuits. Each of the pixel circuits includes a light-emitting element, a capacitor which stores a difference in potential caused by the data signal therein, a drive transistor which has a gate electrode connected to the data line via the capacitor and controls light emission of the light-emitting element based on a difference in potential between the gate electrode and a source electrode thereof, which is generated by a potential supplied by the data line and the potential difference stored in the capacitor, and a variation control switch which causes the difference in potential between the gate and source electrodes of the drive transistor to vary based on the data signal at the turning on thereof and prevents the difference in potential from varying at the turning off thereof.Type: ApplicationFiled: June 17, 2011Publication date: December 22, 2011Inventors: Kenta Kajiyama, Takeshi Izumida, Naoki Tokuda, Hajime Akimoto
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Publication number: 20110234568Abstract: A display device includes: scanning lines for selecting a group of pixels out of pixels; control lines to which a pulse signal is supplied to control selection of at least one of the plurality of scanning lines to which a scanning signal is input; a scanning circuit which includes transistors controlled with the pulse signal, the scanning circuit being connected to the plurality of scanning lines and being disposed outside a display area; and a conductive mesh including conductive wires running in intersecting directions. The conductive mesh is placed above the transistors and the plurality of scanning lines except the display area. Above the plurality of scanning lines, the plurality of conductive wires constituting the conductive mesh intersect each other three-dimensionally in a manner that does not make the plurality of conductive wires parallel to the plurality of scanning lines.Type: ApplicationFiled: March 18, 2011Publication date: September 29, 2011Inventors: Takeshi IZUMIDA, Kenta Kajiyama, Naoki Tokuda, Yasuharu Yatsu, Noriyuki Shikina
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Publication number: 20110221791Abstract: An image display device includes pixel circuits, a power supply line, and a data line for supplying a data signal to the pixel circuits. The pixel circuits each include a light emitting element, a drive transistor for controlling light emission of the light emitting element, a storage capacitor provided between the data line and a gate electrode of the drive transistor, a both-end connection switch for connecting both ends of the storage capacitor to each other, and a current interruption switch for interrupting a path of a current flowing from the power supply line through the both-end connection switch. Before the data signal is supplied to each of the pixel circuits, the both-end connection switch connects the both ends of the storage capacitor to each other, and the current interruption switch is disconnected.Type: ApplicationFiled: March 8, 2011Publication date: September 15, 2011Inventors: Kenta KAJIYAMA, Takeshi Izumida, Naoki Tokuda, Hajime Akimoto, Hiroshi Kageyama, Norihiro Nakamura, Masami Iseki