Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki

Katsumi Asakawa

Hiroaki Sugiura

Kouhei Tamano

Junji Tada

Junichi Nose

Kazuaki Matoba

Hiroaki Ishitani

Shigeharu Yoshikawa

Kozo Ishida

Akihisa Miyata

An unauthorized use preventing device includes: a first measuring unit that measures a global position thereof and outputs the global position as first position information; and a first transmission unit that wirelessly transmits the first position information to an outside. The security section includes: a second measuring unit that measures a global position thereof and outputs the global position as second position information; a first receiving unit that receives the first position information; a position comparison unit that determines whether an inter-instrument distance calculated based on the first and second position information is less than a threshold distance or equal to or more than the threshold distance, and outputs a result of the determination as a position comparison result signal; and a logical product calculation unit that calculates and outputs a logical product of the position comparison result signal and a power supply turning-on signal.

Unauthorized use preventing system of projection-type projector

A projector includes a light modulation part modulating light generated by a light source part, a video signal processing part processing a video signal to be input, and a projection optical system projecting the light modulated by the light modulation part onto an external projection target to obtain a projected video image. The video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas. In a case where only a ratio of a blue signal included in the video signal is high, the blue light effect alleviating part performs control to reduce the brightness of the projected video image as a whole by reducing signal values of the blue signal, a green signal, and a red signal.

Projector having blue light alleviating part

A projector includes a light modulation part modulating light generated by a light source part, a video signal processing part processing a video signal to be input, and a projection optical system projecting the light modulated by the light modulation part onto an external projection target to obtain a projected video image. The video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas. In a case where among a red signal, a green signal, and a blue signal included in a video signal, only a ratio of the blue signal is high, the blue light effect alleviating part generates a blue light effect alleviating signal for controlling the light source part to reduce the brightness of the projected video image as a whole.

A projector comprises an optical engine which projects an image based on a video signal; a circuit section which controls operation of the optical engine; a power source which supplies electric power to the circuit section; a network interface, through which the circuit section communicates with a remote network terminal device; and a hub which is connected to the network interface and includes a plurality of ports. The network interface communicates with the remote network terminal device through one of the ports of the hub. Further, the power source of the projector supplies electric power to the hub.

Projector, network system including projector, and method of controlling projector on network system

The outputs of N kinds of spectral response characteristics from an image sensor are passed through low-pass filters to obtain N kinds of outputs from the 1st through Nth, and the output signal of a pixel of interest having the Kth (1&lE;K&lE;N) spectral response characteristic is multiplied by the ratio of the low-pass filter output of the image sensor output at the coordinates of the pixel of interest to the Kth low-pass filter output at the coordinates of the pixel of interest, thereby the luminance signal with alleviated attenuation of the harmonics components is obtained.

Color video camera for generating a luminance signal with unattenuated harmonics

A projection display apparatus with a light source, a light valve and an optical system for projecting an image formed in an image-forming plane of the light valve onto a screen is disclosed. The projection display apparatus includes a first processor for calculating an area of an image projected onto the screen, a photometer for measuring illuminance in the neighborhood of the image projected onto the screen, a second processor for calculating a black-level correction value from the area of the image calculated by the first processor and the illuminance measured by the photometer, and a light-source-power controller for controlling power supplied to the light source on the basis of the black-level correction value calculated by the second processor.

Projection display apparatus

The outputs of N kinds of spectral response characteristics from an image sensor are passed through low-pass filters to obtain N kinds of outputs from the 1st through Nth, and the output signal of a pixel of interest having the Kth (1.ltoreq.K.ltoreq.N) spectral response characteristic is multiplied by the ratio of the low-pass filter output of the image sensor output at the coordinates of the pixel of interest to the Kth low-pass filter output at the coordinates of the pixel of interest, thereby the luminance signal with alleviated attenuation of the harmonics components is obtained.

Color video camera for generating a luminance signal with unattenuated

A projection-type liquid crystal display apparatus that prevents deterioration of a projected image occurring attributable to lowering of the temperature of a liquid crystal panel, the difference in the temperature between the liquid crystal panels and temperature inclination in the liquid crystal panel. A projection-type liquid crystal display apparatus having a light source 1, liquid crystal panels 12, 13 and 14 for modulating a light beam emitted by the light source 1, a projection lens 21 for projecting the modulated light beam onto a screen 28, temperature detectors 25, 26 and 27 for detecting the temperatures of portions adjacent to the liquid crystal panels 12, 13 and 14, heater elements 18, 19 and 20 disposed adjacent to image forming surfaces of the liquid crystal panels 12, 13 and 14 and on a light path of a light beam emitted from the light source 1, a drive circuit 40 for operating the heater elements 18, 19 and 20 and a control unit 35 for controlling the heat generating performance of the heater elements 18, 19 and 20 in accordance with values detected by the temperature detectors 25, 26 and 27.

Projection-type liquid crystal display apparatus

A projection-type liquid crystal display device having a light source for emitting a luminous flux; a liquid crystal light valve for modulating the luminous flux emitted by the light source means; a liquid crystal drive circuit for applying the common voltage to the common electrode and the video signal to the source electrode; a projection lens for projecting the luminous flux modulated by the liquid crystal light valve onto a screen; a liquid crystal temperature detector for detecting temperature in the vicinity of the liquid crystal light valve; and a controller. The controller controls the common voltage and/or the source voltage on the basis of values detected by the liquid crystal temperature detector in such a way that fluctuation in the light transmittance of the liquid crystal light valve means is reduced.

Growing community of inventors

Tokyo, Japan

Katsumi Asakawa