Aura Systems Inc.

Walter Gonzalez

Andrei Szilagyi

John A Gniady

A video display system having an electrically insulative substrate with a top surface, a bottom surface, and an M.times.N array of holes between the top and bottom surfaces. The M.times.N array of holes corresponds to an M.times.N array of pixels. The system further includes piezoelectric members, each piezoelectric member disposed on the top surface adjacent to each of the holes. Each of the piezoelectric members has two metallized faces and a mirror mounted to the member. An integrated circuit electronic switch matrix is mounted to the bottom surface of the substrate. One of the metallized faces is electrically connected through the holes to the piezoelectric members. The other metallized face is electrically connected to ground. The switch matrix develops electrical signals, with each signal corresponding to an intensity of one of the pixels. The electrical signals are applied to each of the piezoelectric members, each of the piezoelectric members in response thereto changing an orientation of the mirror mounted thereto. Each of the mirrors therefore effects modulation of light intensity reflected from the mirror, and the modulated light intensity from each of the mirrors corresponds to one of the pixels.

Video display system having an electronic switch matrix for controlling

An optical table active leveling and vibration cancellation system is disclosed. The system includes an optical table with three active isolation devices connected to the optical table, and one sole pneumatic device, such that the table is supported on all four corners. Each of the isolation devices includes a pneumatic suspension device and an electromagnetic suspension device. The pneumatic suspension device includes a pressurized load chamber, a gimballed piston received in the pressurized load chamber and coupled to the walls of the pressurized load chamber by a thin walled diaphragm, and a support rod extending from the optical table to the floor level. The electromagnetic bearing suspension device includes a magnetic bearing rotor having two planar surfaces and a peripheral surface, and two magnetic bearing stators, the stators each defining a central aperture and each stator being in a spaced apart relationship from each of the rotor planar surfaces. The rotor is secured to the support rod. Each of the stators includes an annular coil of wire. The electromagnetic suspension system may also include four radial electromagnets spaced around the peripheral surface of the rotor. The radial electromagnets also include an annular coil of wire. The system also includes three proximity sensors mounted under the optical table to detect motion of the table in relation to the floor or another fixed reference, and generate a signal in response to the motion. The system also includes three accelerometers mounted underneath the optical table in a triangle. The accelerometers measure vibration of the table in relation to inertial space and generate a signal in response to the movement. A controller receives the signals from the sensors and accelerometers, and generates a second signal, used to activate the pneumatic and electromagnetic bearing suspension devices to provide active leveling and vibration cancellation of the optical table.

Optical table active leveling and vibration cancellation system

An electronic switch matrix for a video projection system has a plurality of switch elements, each of which is associated with a respective one of the display pixels in a MxN array. A first counter, in response to a pixel clock and the horizontal sync signal, provides the column timing for activating the switch elements. Similarly, a second counter, in response to a row block and the vertical sync signal, provides the row timing for activating the switch elements. A switch element activated simultaneously by each counter then couples the luminance signal to a video display circuit element for developing the appropriate pixel intensity.

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Rancho Palos Verdes, CA, United States of America

Walter Gonzalez