Nec Corporation

Nec Electronics Corporation

Osamu Ishibashi

Fujio Okumura

Masahiko Ohta

Yoshiho Yanagita

So Nishimura

Kazuhiko Aoki

Atsumasa Sawada

Kazuhisa Sunaga

Hideyuki Sugita

Ayami Tanabe

Hiroshi Tsuchi

Kenji Kobayashi

Hiroshi Haga

Masao Imai

Hideki Asada

Hiroshi Kajitani

Yoshihiko Suemura

Suguru Watanabe

Hiroshi Hayama

Hiroshi Kanou

Shunji Noda

Ikuo Akiyama

Eiji Akiyama

Hiroaki Fukunishi

Masahiro Jikihara

A switching output circuit is provided that enables an accurate control of output power. To achieve the objective, a switching output circuit according to an exemplary aspect of the present invention includes eight switching means, two electric storage means, and a control means, wherein the control means controls the switching means and switches a conduction state and a non-conduction state, by which the power supplied from a direct-current power supply is switched and supplied to an inductive load.

Switching output circuit

A pulsed discharge device according to an exemplary aspect of the present invention includes a controller configured to determine an interruption time to a discharge time based on a predetermined time ratio between the discharge time and the interruption time when performing a pulsed discharge to repeat alternately a discharge and a pause in discharging of a chemical battery.

Pulsed discharge device and pulsed discharge method

A projector includes a screen having a periodic array of color stripes for producing visible light depending on incident light, a light source that remits a light beam, a projection unit that scans an area of the screen where the color stripes are disposed, with the light beam in a direction across the color stripes, to display an image on the screen, a detector that detects the visible light from each of the color stripes as a feedback light pulse, and a controller that adjusts a start-of-emission timing of the light source based on a start-of-detection timing at which the feedback light pulse is detected by the detector and a detection period during which the feedback light pulse is detected by the detector, and controlling the light source to emit the light beam in order to apply light pulses to the color stripes within boundaries thereof.

Projector and control method

A projection screen includes: phosphor regions arranged cyclically in an in-plane direction of a display region; a plurality of black stripes and reference black stripes that partition the display region into the phosphor regions; and an optical information formation unit that is provided in a specific position within the display region and that generates readable optical information.

Projection system, projection-type image display device, and multi-projection system

A multi-projection display system is provided with a plurality of sensor units corresponding to projector units. The sensor units detect brightness for each color in a projected image that is projected on a screen and supply the detection results. The projector unit generates a brightness correction table on the basis of the image signal of a specific picture element of the projected image realized by an adjacent projector unit and on the basis of the brightness of the specific picture element of the projected image of the adjacent projector unit that is detected by a sensor unit for matching the brightness of the image projected by its own projector unit with that of the adjacent projector unit, refers to the brightness correction table to correct brightness for each color of the image signals that are received as input, and projects onto a screen the light of each color in accordance with the corrected image signals.

Multi-projection display system and method of adjusting brightness thereof

An optical scanning device includes: a first scanning; a first scanning mirror driving unit; a light emission signal output unit; a light receiving unit; and a phase control unit which controls the first scanning mirror driving unit so as to delay a phase of the oscillation of the first scanning mirror when the light receiving unit outputs the detection signal before intermediate time in a case where the light receiving unit does not output the detection signal during a predetermined period of time, the phase control unit controlling the first scanning mirror driving unit so as to advance a phase of the oscillation of the first scanning mirror when the light receiving unit outputs the detection signal after the intermediate time in the case where the light receiving unit does not output the detection signal during the predetermined period of time.

Optical scanning device, optical scanning method, program, and image display device

A transmission device displays a public image (a first image) provided to unspecified users, a private image (a second image) provided to particular users, and a mask image of the private image in a time division multiplexed manner, and transmits a private image sync signal synchronized with display of the private image. A reception device receives the private image sync signal transmitted from the transmission device and shoots by a shooting unit the private image displayed on the transmission device by using the private image sync signal, and displays the shot image on a display unit.

Communication system, transmission device and reception device

An optical switch includes electro-optic crystal, and electrode unit including a plurality of electrodes arranged on the same plane in electro-optic crystal to extend in parallel to one another. A refractive index of a part of electro-optic crystal is changed by an electric field generated at electrode unit, thereby switching transmission and reflection of light incident on electro-optic crystal. Electro-optic crystal has an entrance surface through which light enters and an exit surface from which light exits. Electrode unit is located between the entrance surface and the exit surface. An angle &#x3b8;x formed between a longitudinal direction of electrodes and at least one surface from among the entrance surface and the exit surface is set near an angle that satisfies the expression &#x3b8;x=90&#xb0;&#x2212;Sin[ cos(Tan(n))] in a wavelength of light to be modulated.

Optical switch, image display device, image forming device, and method for manufacturing optical switch

An optical switch changes the refractive index of an electro-optical crystal according to an electric field applied to the electro-optical crystal so as to switch depending on whether the electro-optical crystal enables incident light to pass through or whether the electro-optical crystal enables incident light to be totally reflected. The optical switch includes an electrode section including a plurality of electrodes and formed in the electro-optical crystal, a principal plane including the largest area of each electrode on a same plane of the electro-optical crystal; an insulator layer on at least one plane of the electro-optical crystal, the plane being parallel with the electrode section, the insulator layer made of an insulator with lower dielectric constant than the electro-optical crystal; and a temperature control device formed on and in contact with the insulator layer and controls a temperature of the electrode section or dissipates heat generated in the electrode section.

Optical switch

An optical switch for switching between transmission and total reflection of incident lightapplied to electro-optical crystalby applying an electric field to electro-optical crystalto thereby change the refractive index of electro-optical crystalincludes a plurality of electrodesdisposed in electro-optical crystalto provide electrode assemblyfor applying the electric field to electro-optical crystal. Electro-optical crystalhas a refractive index changing portion (not shown) whose refractive index is changed by the electric field applied by electrode assembly, the refractive index changing portion enclosing electrode assemblyin its entirety. The refractive index changing portion has a flat refractive index boundary.

The present invention provides an optical scanning device that prevents a disadvantageous increase in device size. Transfer optical systemincludes at least concave mirrorsand. Furthermore, transfer optical systemallows a light beam scanned by scan mirrorto enter the scan mirror again at least via concave mirrorsand. Then, scan mirrorscans and emits the laser light beam received via concave mirrorsand, to a plane of projection.

Optical scanning device and image output apparatus

A data transmission system includes a transmitter including a drive unit outputting complementary signals to first and second transmission lines according to data for transmission, and a receptor including first and second termination resistors, and a receiver circuit. One ends of the first and second termination resistors are respectively connected to first and second nodes that are connected to first and second transmission lines and other ends of the first and second termination resistors are connected in common to a third node. The receiver circuit supplies a current to the third node and outputs received data corresponding to data for transmission, in accordance with a potential difference between the first and second nodes.

Data transmission system and method, and electronic apparatus provided with same data transmission system

A current output type digital-analog conversion circuit which outputs a current signal includes a decoder for decoding higher-order bits of input digital data, a plurality of binary current generators, and a current adder. Each of the binary current generators includes a device for outputting a binary current which increases linearly as binary values according to lower-order bits of the input digital data, and a device for outputting a predetermined all-ON current. Either the device for outputting the binary current or the element for outputting the all-ON current of the binary current generator is selected according to a decode signal output by the decoder. The current adder adds up and outputs the binary currents and the all-ON currents output by the plurality of binary current generators.

Current output type digital-analog conversion circuit, and graphic display device

The amplifier includes first and second inverters that form a flip-flop. In this flip-flop, an input of first inverter is connected to an output of the second inverter, and an output of the first inverter is connected to an input of the second inverter. Control terminals of at least one transistors (MNMN) of first and second transistor pairs (MPMNand MPMN) that constitute first and second inverters, respectively, are connected to inputs of first and second inverters through first and second capacitances (CC), respectively. At resetting, inputs () and outputs (OUT, OUTB) of first and second inverters are not mutually cross-connected, wherein a reference signal (VR) is supplied in common to inputs () of the first and second inverters. The one transistors (MNMN) are diode-connected. Voltage differences between reference signal (VR) and respective control terminals of the one transistors are stored in the first and second capacitances (CC), respectively. At signal input, diode connections of the one transistors (MNMN) are released. Inputs () of the first and second inverters are disconnected from the reference signal. First and second input signals (SS) are supplied to inputs (), respectively. Then, inputs and outputs of first and second inverters are mutually cross-connected, forming the flip-flop. The amplifier with high-speed and highly reliable operation does not depend on variations in devices therein.

Signal amplifier

The display device of the present invention has a scan line driver element formed on a dielectric substrate and provided with a scan line driver circuit made up of thin film transistors. The scan line driver element is mounted on the region along one side of the display panel outside the display pixel region. Further, signal line driver element provided with a signal line driver circuit made up of mono crystal silicon transistors are mounted on the region along another side adjoining the one side of the display panel outside the display pixel region.

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Tokyo, Japan

Osamu Ishibashi