Abstract: A display system for sensing a finger of a user applied to the display system includes a display panel; a sensor for sensing the finger; a sensing light source configured to emit a first light having a first wavelength W1; and a reflective polarizer disposed between the display panel and the sensor. For a substantially normally incident light, an optical transmittance of the reflective polarizer versus wavelength for a first polarization state has a band edge such that for a first wavelength range extending from a smaller wavelength L1 to a greater wavelength L2 and including W1, where 30 nm?L2?L1?50 nm and L1 is greater than and within about 20 nm of a wavelength L3 corresponding to an optical transmittance of about 50% along the band edge, the optical transmittance has an average of greater than about 75%.

Abstract: An electronic helmet is provided that includes a helmet body and an integrated electronic system disposed in the helmet body, providing a number of convenient functions. The helmet body has a hard outer shell and a hard inner shell mounted to the outer shell such that a cavity is defined between the outer and the inner shells. The inner shell can include suitable material to provide the wearer effective RF shielding from the electronic system, such as, nickel-plated carbon fiber to provide RF shielding. The helmet body further includes a shock-absorbent structure disposed between the inner shell and the head of a wearer.

Abstract: An electronic helmet is provided that includes a helmet body and an integrated electronic system disposed in the helmet body, providing a number of convenient functions. The helmet body has a hard outer shell and a hard inner shell mounted to the outer shell such that a cavity is defined between the outer and the inner shells. The inner shell can include suitable material to provide the wearer effective RF shielding from the electronic system, such as, nickel-plated carbon fiber to provide RF shielding. The helmet body further includes a shock-absorbent structure disposed between the inner shell and the head of a wearer.

Abstract: There is presented an antenna assembly comprising an elongated mast slida mounted in a support structure. A first electric motor is disposed at a proximal end of the mast for moving the mast along the axis of the mast, and a second electric motor is disposed at a distal end of the mast for moving the mast rotatively about its axis.

Abstract: A cross product calculator to multiply mathematical representations of a pair of vectors in order to calculate a resultant vector, which resultant vector is aligned normal to the plane in which the pair of vectors is located. The present cross product calculator has application to a real time computer generated imagery or graphics system having the capability to provide reliable color shading of a three dimensional object moving across the screen of a video display. The resultant normal vector provided by the cross product calculator is indicative of the orientation of the object relative to a source of supply of incident light. Storage apparatus and control hardware are included to provide accurate, normalized equivalents of the mathematical representations of the pair of vectors which are multiplied together to derive the cross product thereof.

Abstract: A matrix multiplier having application to a real time computer-generated imagery or graphics system, wherein the output of the multiplier is normalized to increase both the accuracy and speed by which a three dimensional object can be displayed on a video stream. The output of the matrix multiplier is typically a plurality of multiple (e.g. 32 or more) bit serial data screen. Each data stream is normalized to itself and to each of the other of the plurality of data streams which form the product of the matrix multiplication. That is, a particular segment (e.g. 16 bits) of each data stream is selected for continued processing in order to efficiently and accurately define an object in three dimensional space. The selection of each data stream segment is dependent upon the bit pattern thereof and, more particularly, upon the occurance of a pair of successive bits of opposite polarity relative to one another.