Sharp Kabushiki Kaisha Corporation

Kabushiki Kaisha Toshiba

Fujitsu Corporation

Au Optronics Corporation

Toshiba Electronic Devices & Storage Corporation

Toshiba Infrastructure Systems & Solutions Corporation

Toshiba Corporation

Fujitsu Display Technologies Corporation

Nissin Shokuhin Kabushiki Kaisha

Takashi Takagi

Tetsuya Fujikawa

Tomonori Tanose

Kazutaka Hanaoka

Manabu Sawasaki

Naoto Kondo

Kunihiro Tashiro

Norio Sugiura

Isao Tsushima

Katsufumi Ohmuro

Kengo Kanii

Shota Makimoto

Jin Hirosawa

Yohei Nakanishi

Hiroyasu Inoue

Takahiro Sasaki

Seiji Doi

Yuichi Inoue

Hidefumi Yoshida

Tomoshige Oda

Arihiro Takeda

Yoshio Koike

Katsunori Misaki

Shingo Kataoka

Seiji Tanuma

Hideo Chida

Kimiaki Nakamura

Takatoshi Mayama

Tsutomu Seino

Shiro Hirota

Akira Komorita

Masahiro Ikeda

Yasuhiro Ohno

Masakazu Shibasaki

Yoji Taniguchi

Toshimitsu Aizawa

Masahiro Kihara

Akihiro Matsui

Atuyuki Hoshino

Shinichi Toda

Hidetoshi Sukenori

Shen Wang

Ikuo Yasuoka

Makoto Takeda

Mitsuhiro Numazaki

Takuya Saguchi

Yoshinori Tanaka

Yasutoshi Tasaka

Yosuke Nakazawa

Mitsuo Yoshimura

Hiroaki Yoshinari

Tadashi Asukai

Naoshige Itami

Susumu Nakano

Kazuhiko Sumi

Hideyuki Shimizu

Michiaki Ishikawa

Kiyoshi Sawada

Hirofumi Kawai

Yuko Zenpuku

Takahiko Minami

Hidetoshi Manabe

Haruhiko Fujito

Naonobu Matsui

Kazuyuki Hosokawa

An electric motor drive apparatus includes an electric motor. A power conversion device, a controller, and a current detector. The controller calculates a phase of an armature flux linkage of the electric motor by using a flowing current detected by the current detector. The calculating a phase of an armature flux linkage of the electric motor includes calculating an armature flux linkage of the electric motor including an initial value of an armature flux linkage of the electric motor which is calculated from a rotational position of the electric motor estimated by using a motor flux of the electric motor measured in advance and the flowing current.

Electric motor drive apparatus, electric motor drive method, and storage medium

According to one embodiment, a power conversion apparatus includes: semiconductor elements mutually coupled in parallel; gate drivers which corresponds to the respective semiconductor elements and which supplies a drive voltage to the corresponding semiconductor elements; and a controller configured to supply to the respective gate drivers a gate command corresponding to the drive voltage in accordance with a carrier wave, wherein the semiconductor elements are set to a conductive state at different timings in an operation period of the semiconductor elements.

Power conversion apparatus

According to one embodiment, a driving device includes a voltage controller, a parameter setter, and a phase adjuster. The voltage controller causes an electric power converter to apply a drive voltage to the electric motor, the electric power converter converting input electric power to A/C electric power having desired voltage and frequency and supplying the converted electric power to an electric motor. The parameter setter sets at least one of a rotation speed of the electric motor and a parameter related to the rotation speed as speed information. The phase adjuster adjusts a phase of the drive voltage in such a manner that an index calculated based on a current flowing in the electric motor and the speed information set in the parameter setter becomes smaller.

Driving device, driving system, and method of driving electric motor

A driving device of one embodiment includes a phase estimator and a voltage controller. The phase estimator estimates a phase of stator interlinkage magnetic flux of an electric motor based on a current flowing through the electric motor, a voltage command of a drive voltage applied to the electric motor, and a winding resistance value of the electric motor. The voltage controller acquires a first voltage vector component in a direction in which the stator interlinkage magnetic flux acts and a second voltage vector component in a direction which is orthogonal to the direction in which the stator interlinkage magnetic flux acts for the voltage command of the drive voltage, and sets the voltage command of the drive voltage based on the first voltage vector component and the second voltage vector component.

A power converting apparatus for vehicles according to an embodiment controls a plurality of AC motors for vehicle traveling set on a motor setting table. The power converting apparatus includes a plurality of inverter circuits and a plurality of controllers. The plurality of inverter circuits supply three-phase AC power to the AC motors. The plurality of controllers generate control signals for ON/OFF-controlling a plurality of switching elements of the inverter circuits and perform PWM control on the inverter circuits associated with the plurality of controllers among the plurality of inverter circuits. The plurality of controllers perform the PWM control on the associated inverter circuits according to control signals generated using carrier waves having phases different from one another. A phase difference between the carrier waves is based on the number of the plurality of AC motors set on the motor setting table.

Power converting apparatus for vehicles

Drive control equipment for a vehicle comprises: a plurality of power conversion devices respectively connected with a plurality of motors that convert DC power supplied from a DC power source to AC power and output this to said motors; a control device that controls the power conversion devices; a frame that accommodates said power conversion devices and the control device and having a ceiling wall facing below the vehicle floor; and a power unit having a cooler in which are installed a plurality of semiconductor elements constituting the power conversion devices; a first control board provided with a first connector connected with said semiconductor elements, arranged facing the cooler; and a second control board arranged in a direction orthogonal to said first control board and connected with a second connector connected with the first connector of said first control board.

Drive control equipment for a vehicle

A liquid crystal display device including first and second substrates, a liquid crystal layer, a pixel electrode, a counter electrode, a first molecule orientation film formed on the first substrate so as to cover the pixel electrode, and a second molecule orientation film formed on the second substrate so as to cover the counter electrode. The pixel electrode includes first micro-electrode patterns extending in a first direction, second micro-electrode patterns extending in a second direction, third micro-electrode patterns extending in a third direction and fourth micro-electrode patterns extending in a fourth direction, wherein the first, second, third and fourth directions are different from one another. When a driving voltage is applied between the pixel and counter electrodes, liquid crystal molecules that are located at the first, second, third and fourth micro-electrode patterns are tilted parallel to a corresponding one of the first, second, third and fourth directions, respectively, when viewed in a plan view.

Liquid crystal display device and method for fabricating the same

A liquid crystal display device including first and second substrates, and a liquid crystal layer sealed therebetween. The device also includes a first electrode formed on the first substrate and a second electrode formed on the second substrate; a first molecule orientation film formed on the first substrate so as to cover the first electrode; a second molecule orientation film formed on the second substrate so as to cover the second electrode; a plurality of micro structures associated with at least one of the first and second electrodes; and a plurality of rough structural patterns associated with at least one of the first and second electrodes. At least some of the micro structures extend generally parallel to each other, and the rough structural patterns extend in directions different from directions in which the micro structures extend.

A liquid crystal display device including a first substrate, with a plurality of bus lines formed thereon such that they intersect with each other, and a second substrate facing the first substrate. The device also includes a plurality of pixel regions defined by the bus lines; a thin film transistor formed in each of the pixel regions; a color filter layer formed in each of the pixel regions; and a pixel electrode formed in each of the pixel regions. A liquid crystal layer is provided between the first substrate and the second substrate. The liquid crystal layer is located next to a polymeric structure formed by irradiating a mixture of liquid crystal materials and ultraviolet-curing monomers with ultraviolet light, and a black display is achieved when no voltage or a subthreshold voltage is applied.

Liquid crystal display device

A liquid crystal device including a first substrate including a plurality of picture elements; a second substrate including a common electrode; and a liquid crystal layer sandwiched therebetween. The first substrate and the second substrate are arranged to be opposite to each other, and each of the plurality of picture elements has a plurality of elongated electrodes configured to apply voltages to the liquid crystal layer in cooperation with the common electrode. The elongated electrodes within one of the plurality of picture elements extend in eight directions, and each of the plurality of picture elements is divided into eight regions based upon the eight directions. In each of the eight regions of one of the plurality of picture elements, two or more of the plurality of elongated electrodes extend along a corresponding one of the eight directions.

A liquid crystal display device including a first and second substrates and a liquid crystal layer. The first substrate includes a plurality of picture elements, and at least one of the plurality of picture elements includes: a switching element; a plurality of gate bus lines extending in a first direction and electrically connected to the switching element; a plurality of data bus lines extending in a second direction and electrically connected to the switching element; a first sub picture element electrode and a second sub picture element electrode disposed adjacent to the first sub picture element electrode with a gap therebetween, and a control electrode overlapping both the first and second sub picture element electrodes. The control electrode extends in the second direction. Each of the first and second sub picture element electrodes includes a cross-shaped connecting electrode part and microelectrode parts extending from the connecting electrode part.

A liquid crystal display device including first and second substrates, with a liquid crystal layer sealed therebetween. The device also includes a first electrode formed on the first substrate, a second electrode formed on the second substrate, a first molecule orientation film formed on the first substrate so as to cover the first electrode, a second molecule orientation film formed on the second substrate so as to cover the second electrode, and a plurality of micro structures associated with at least one of the first and second electrodes, wherein at least some of the micro structures extend generally parallel to each other. When a driving voltage is applied between the first and second electrodes, liquid crystal molecules of the liquid crystal layer are oriented such that no dark line occurs in a vicinity of the plurality of micro structures and no dark line occurs between adjacent micro structures.

According to one embodiment, an electronic device includes a positive electrode, a negative electrode, a first terminal, a second terminal, a first plurality of switching elements and anti-parallel diodes coupled between the positive electrode and the first terminal and the second terminal, a second plurality of switching elements and anti-parallel diodes coupled between the negative electrode and the first terminal and the second terminal and a PiN diode coupled between the positive electrode and the negative electrode with reverse polarity.

Power conversion device

The technology presented herein has a feature of providing a liquid crystal display device of an excellent viewing angle characteristic and high brightness, including: liquid crystals containing polymerizable monomers between a first substrate with a pixel electrode having micro slits and a second substrate facing the first substrate; wherein the monomers are polymerizable with voltage applied to the liquid crystals; and an alignment orientation of the liquid crystals is controllable to a direction of extending the micro slit, wherein the pixel electrode includes: a direct coupling part electrically connected to a switching element; a capacitive coupling part electrically insulated from the switching element, and a space between the direct and capacitive coupling parts, wherein directions in which the micro slits are extended along the direct and capacitive coupling parts are orthogonal to each other.

A substrate for a liquid crystal display device, including a pixel electrode formed on the substrate, wherein the pixel electrode includes a micro-cutout pattern defined by a plurality of micro-cutouts extending in four different directions with respect to an extension direction of a rough structural pattern. The substrate also includes a first electrode extending in a first direction, a second electrode extending in a second direction that is approximately perpendicular to the first direction, and a contact hole that electrically connects the pixel electrode and the first electrode. A portion of the rough structural pattern and/or a portion of the micro-cutout pattern overlap the first electrode. Also disclosed is a liquid crystal display device including such a substrate.

Liquid crystal display device and substrate for liquid crystal display device

Growing community of inventors

Kawasaki, Japan

Takashi Takagi