Patents Assigned to Toshiba Matsushita Display Technology Co., Ltd.
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Patent number: 7924248Abstract: To provide a drive method capable of maintaining gradation display performance regardless of screen display brightness. Reference numeral 491R denotes a regulator used to control reference current for red (R). By adjusting a reference current for R linearly, it is possible to linearly vary a current flowing through a transistor 472a which constitutes a current mirror with a transistor 471R. This changes a current flowing through a transistor 472b which has received a current-based delivery from the transistor 472a in a transistor group 521a. This in turn causes changes to a transistor 473a in a transistor group 521b which constitutes a current mirror with the transistor 472b, resulting in changes to a transistor 473b which has received a current-based delivery from the transistor 473a. Thus, since drive current of the unit transistor 484 changes, programming current can be changed linearly.Type: GrantFiled: April 15, 2010Date of Patent: April 12, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Hiroshi Takahara
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Patent number: 7924273Abstract: In making a contact determination between an object and a display screen, a display apparatus of the present invention is capable of adjusting a region on which to make a contact determination in response to the displayed image in a liquid crystal panel, so that the influence by the displayed image can be suppressed. Moreover, for simplifying the contact determination process, the display apparatus sets solid a region in the picked-up image that is not a target of the contact determination, with a predetermined gradation value.Type: GrantFiled: October 5, 2007Date of Patent: April 12, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Hiroki Nakamura, Takashi Nakamura, Hirotaka Hayashi, Norio Tada, Takayuki Imai
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Patent number: 7924393Abstract: The present invention regarding a liquid crystal display device aims to further prevent generation of low-temperature bubbles in a uniform cell gap and to further improve strength against pressure applied to a glass surface while saving a production cost. A liquid crystal display device according to the present invention includes multiple spacers arranged on a liquid crystal layer side of an array substrate. The multiple spacers include: a first spacer arranged in a part of an insulating layer having no contact hole formed thereon; and a second spacer arranged inside of the contact hole. The contact hole is provided on the insulating layer and connects a switching element to either a corresponding pixel electrode or a corresponding auxiliary capacitive layer.Type: GrantFiled: April 29, 2008Date of Patent: April 12, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Nobuko Fukuoka, Arihiro Takeda, Tetsuya Iizuka, Hirokazu Morimoto
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Patent number: 7915813Abstract: An organic EL display device includes a first light emission layer which includes a first dopant material having a first absorbance peak in absorbance spectrum characteristics and a first host material having a first absorbance bottom on a shorter wavelength side than the first absorbance peak, the first light emission layer extending over the first to third organic EL elements and being disposed above pixel electrodes of the first to third organic EL elements, and a second light emission layer which includes a second dopant material having a second absorbance peak in absorbance spectrum characteristics and a second host material having a second absorbance bottom on a shorter wavelength side than the first absorbance peak and than the second absorbance peak, the second light emission layer extending over the first to third organic EL elements and being disposed above the first light emission layer.Type: GrantFiled: March 23, 2009Date of Patent: March 29, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Shuhei Yokoyama, Masuyuki Oota, Satoshi Okutani, Takanobu Takenaka
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Patent number: 7911458Abstract: A display control circuit includes a driver circuit DR which drives a plurality of pixels, and a driver control circuit which controls the driver circuit. The driver control circuit includes a control bus which transfers instruction data, an operation setting unit which executes operation settings in accordance with the instruction data from the control bus, and a gateway unit provided for a case in which the instruction data is internally generated and output to the control bus, and is capable of enabling or disabling an instruction data output to the control bus in accordance with a control input signal.Type: GrantFiled: November 27, 2006Date of Patent: March 22, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Kentaro Teranishi
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Patent number: 7907229Abstract: A main liquid crystal display panel is attached to a frame, and a sub liquid crystal display panel is attached to a bezel. The frame and the bezel are assembled to each other so that the main liquid crystal display panel and the sub liquid crystal display panel are arranged and held so as to face opposite sides. The frame and the bezel are separated from each other, whereby each of the liquid crystal display panels and can be easily separated at every part of the frame and the bezel.Type: GrantFiled: January 5, 2007Date of Patent: March 15, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Shunichiro Hayashi, Atsushi Hirota
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Patent number: 7898556Abstract: A display method can be flexibly applied to suppress the power consumption and a device and display method which can reduce the power consumption while the image quality is prevented from being deteriorated are provided. A display device which can be operated in a progressive mode and interlace mode includes a display portion having a plurality of pixels arranged thereon and a gradation correction table which stores data used to correct a difference between a gradation level when the display portion is driven in the progressive mode and a gradation level when it is driven in the interlace mode. Then, when video data supplied to the display portion is set in the interlace mode, a timing controller corrects the video data by use of data in the gradation correction table.Type: GrantFiled: August 30, 2007Date of Patent: March 1, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Kouhei Kinoshita
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Patent number: 7894007Abstract: A liquid crystal display device includes a liquid crystal display panel having a display section which is composed of a plurality of display pixels, a driving unit which drives the display pixels, and a control unit which controls the driving unit. A first substrate includes pixel electrodes which are disposed in association with the plurality of display pixels. A second substrate includes a counter-electrode which is opposed to the plurality of pixel electrodes. A pair of alignment films are disposed on the plurality of pixel electrodes and the counter-electrode, and control an alignment state of liquid crystal molecules, which are included in the liquid crystal layer, by rubbing treatment. Dummy display pixels are disposed on a terminal end side of the display section in a rubbing direction. A driving unit includes circuit for cyclically applying a reverse transition prevention signal to the dummy display pixels.Type: GrantFiled: May 2, 2008Date of Patent: February 22, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Tetsuo Fukami, Yukio Tanaka, Masaki Miyatake, Hiroshi Azuma, Kenji Nakao
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Patent number: 7889292Abstract: A liquid crystal display device comprises a liquid crystal display panel having a first substrate, a second substrate located opposite the first substrate with a gap between the first substrate and the second substrate, and a liquid crystal layer held between the first substrate and the second substrate, a polarizing plate located opposite the liquid crystal layer, and a polarizing reflection layer positioned opposite the polarizing plate across the liquid crystal layer and located opposite the liquid crystal layer to reflect linearly polarized light polarized in one direction parallel to a plane of the liquid crystal display panel.Type: GrantFiled: June 27, 2008Date of Patent: February 15, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Yuzo Hisatake
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Patent number: 7889154Abstract: A liquid crystal display apparatus includes a display panel configured to be formed by arranging pixels like a matrix, a light source configured to light the display panel, and a driving control means for controlling the display panel, wherein the pixels are transreflective type liquid crystal pixels having a reflective part and a transmissive part driven independently, and the driving control means is configured to separately control non-image periods of the reflective part and transmissive part.Type: GrantFiled: July 25, 2007Date of Patent: February 15, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Shigesumi Araki, Kazuhiro Nishiyama, Mitsutaka Okita
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Patent number: 7884900Abstract: A color filter layer is formed on a glass substrate of a counter substrate. A bank pattern is formed of the same material as a red color-filter portion, a green color filter portion and a blue color filter portion of the color filter layer at the outside of the color filter layer on the glass substrate in the same step. A light shielding material is coated in a bank between the bank pattern and the color filter layer to form a light shielding layer. The light shielding layer can be formed so as to be continuous with the peripheral edge of the color filter layer. The light shielding layer is less likely to overlap with the inside of a display frame portion of the liquid crystal panel, and the aperture ratio is less likely to be reduced. The number of manufacturing steps of the light shielding layer is reduced.Type: GrantFiled: May 24, 2006Date of Patent: February 8, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Takashi Doi, Hiroyuki Nagata, Norihisa Nakao, Kiyoshi Shohara, Minako Hamamoto, Takeshi Yamamoto
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Patent number: 7880716Abstract: A liquid crystal display device includes liquid crystal pixels, signal line groups each including a predetermined number of signal lines, and a drive circuit which selects the pixels on a row-by-row basis and drives the pixels of the selected row via the signal lines. The drive circuit includes a signal line driver which outputs a predetermined number of pixel voltages for each group driving period while the pixels of each row are being selected, a multiplexer which distributes to each signal line group the pixel voltages output from the signal line driver, and a controller which controls the multiplexer to electrically connect all of the signal line groups to the signal line driver and electrically disconnect the signal line groups one by one from the signal line driver for each group driving period, in a selection period of the pixels of an initial row that requires polarity inversion.Type: GrantFiled: October 16, 2007Date of Patent: February 1, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Yukio Tanaka, Tetsuo Fukami
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Patent number: 7872624Abstract: A liquid crystal display device includes a liquid crystal display element section that is initialized such that the alignment state of liquid crystal molecules is transitioned from a splay alignment to a bend alignment capable of displaying an image, and a driving circuit that applies, in the initialization, a transition voltage, which causes the alignment state of the liquid crystal molecules to be transitioned from the splay alignment to the bend alignment, to the liquid crystal display element section. In particular, the driving circuit includes a transition voltage setting unit that alternately sets the transition voltage at a first polarity and a second polarity that is opposite to the first polarity.Type: GrantFiled: August 18, 2006Date of Patent: January 18, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Kazuaki Igarashi, Kenji Nakao
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Patent number: 7872704Abstract: A flat-panel display device comprises a display panel, a main surface of which is substantially a viewing area; a bezel cover formed of a metal frame, which covers a fringe part of the display panel; a touchscreen panel that is arranged to cover the viewing area of the display panel so that the bezel cover is sandwiched between the fringe part of the display panel and a fringe part of the touchscreen panel; and an outsert-molded resin part that is formed integrally on said metal frame, by outsert molding with a black resin material, and covers an inner fringe of said metal frame as well as its vicinity on a surface facing the touchscreen panel.Type: GrantFiled: December 4, 2008Date of Patent: January 18, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Yukio Ooami
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Patent number: 7868977Abstract: Optical compensation elements include first phase plates and second phase plates, which have retardation in a front-plane direction. When a value ?n/?n? is set by normalizing a retardation amount ?n·d relating to light of each of wavelengths by a retardation amount ?n?·d relating to light of a predetermined wavelength ?, a normalized value ?n/?n? in the first phase plate is greater than a normalized value ?n/?n? in a liquid crystal layer, and a normalized value ?n/?n? in the second phase plate is less than the normalized value ?n/?n? in the liquid crystal layer, with respect to light of wavelengths other than the predetermined wavelength.Type: GrantFiled: May 26, 2006Date of Patent: January 11, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Kenji Nakao, Kazuhiro Nishiyama, Mitsutaka Okita, Daiichi Suzuki, Shigesumi Araki
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Patent number: 7868979Abstract: A liquid crystal display device includes a liquid crystal display panel to which an OCB mode is applied, and an optical compensation element which optically compensates a retardation of the liquid crystal layer in a predetermined display state in which a voltage is applied to the liquid crystal layer. The optical compensation element includes a polarizer, a first retardation plate which is disposed between the polarizer and the liquid crystal display panel and in which discotic liquid crystal molecules are fixed in a state in which the discotic liquid crystal molecules are hybrid-aligned along a normal direction, and a second retardation plate which is disposed between the polarizer and the first retardation plate and has wavelength dispersion characteristics which are opposite to wavelength dispersion characteristics of an in-plane retardation in the liquid crystal layer.Type: GrantFiled: November 13, 2008Date of Patent: January 11, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Mitsutaka Okita, Kazuhiro Nishiyama, Shigesumi Araki
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Patent number: 7864155Abstract: A display control circuit includes a vertical timing control circuit that generates first and second start signals, a panel driving unit that sequentially drives a plurality of OCB liquid crystal pixels in units of one row under the control of the first start signal to hold pixel voltages for gradation display in the pixels PX of the driven row, and that sequentially drives the pixels in units of at least one row under the control of the second start signal to hold pixel voltages for black insertion in the pixels of the driven row, and a light source driving unit that drives a plurality of backlight sources arranged substantially in parallel to the rows of pixels. In particular, the light source driving unit is configured to start, in synchronism with the first start signal, an operation for sequentially blinking the backlight sources with a predetermined duty ratio.Type: GrantFiled: September 13, 2005Date of Patent: January 4, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Seiji Kawaguchi
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Patent number: 7864156Abstract: A liquid crystal display device includes a liquid crystal display panel which periodically performs graduation display and non-graduation display, a backlight which illuminates the liquid crystal display panel, and a light source control circuit which sets an illumination period that allows illumination of the backlight for the gradation display and drives the backlight unit during the illumination period. The light source control circuit is configured to drive the backlight intermittently during the illumination period in limiting the luminance of the backlight.Type: GrantFiled: May 29, 2007Date of Patent: January 4, 2011Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Mitsutaka Okita, Kazuhiro Nishiyama, Shigesumi Araki
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Publication number: 20100277401Abstract: In order to charge and discharge parasitic capacitance of a source signal line sufficiently and program a predetermined current value into a pixel transistor, it is necessary to output a relatively large current from the source driver circuit. However, if such a large current is passed through the source signal line, the value of this current is programmed into the pixel, causing a larger than desired current to flow through an EL element. For example, if a 10 times larger current is used for programming, a 10 times larger current flows through the EL element, and thus the EL element illuminates 10 times more brightly. To obtain predetermined emission brightness, the time during which the current flows through the EL element can be reduced to 1/10 of one frame (1 F). This way, the parasitic capacitance of the source signal line can be charged and discharged sufficiently and the predetermined emission brightness can be obtained.Type: ApplicationFiled: July 13, 2010Publication date: November 4, 2010Applicant: Toshiba Matsushita Display Technology Co., Ltd.Inventors: Hiroshi Takahara, Hitoshi Tsuge
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Patent number: 7821606Abstract: A liquid crystal display device includes a liquid crystal display panel which is configured to hold a liquid crystal layer between an array substrate and a counter-substrate. The array substrate includes, on an insulating substrate, a switching element which is disposed in association with each of pixels, a pixel electrode which is connected to the switching element, and a common electrode which is separated from the pixel electrode and is common to the pixels. The counter-substrate includes a shield electrode disposed on an inner surface of an insulating substrate, which is opposed to the liquid crystal layer, and a dielectric layer disposed between the shield electrode and the liquid crystal layer.Type: GrantFiled: November 21, 2007Date of Patent: October 26, 2010Assignee: Toshiba Matsushita Display Technology Co., Ltd.Inventor: Takaharu Ogino