Bae Systems Information and Electronic Systems Integration Inc.

Bae Systems Information and Electronics Systems Integration Inc.

Frantorf Investments Gmbh, LLC

Michael Schmidt

Thomas V Gunn

Wesley H Halstead

Richmond F Hicks

Karl D Brommer

Robert B MacLeod

The present invention is for a high quality digital FM radio system that utilizes the subcarrier band to generate digital audio signals. The hybrid FM radio system utilizes the subcarrier band to transmit the digital FM signals that are synchronized to the analog FM signals. The receiver processes both the analog and digital signals and a high quality FM signal results. The receiver may switch between the traditional analog signal and the higher quality digital signal automatically to present the best possible audio to the user.

Digital FM radio system

A processing scheme for digital storage media using multi-user detection to separate tracks of data or remove interference from neighboring tracks. In one embodiment, data is written on a plurality of tracks positioned sufficiently close together so that multiple tracks are detected simultaneously by the read access sensor. Upon scanning the surface for data, the read element simultaneously receives the data signals from a plurality of tracks. Joint detection signal processing resolves the interference and data bits from the multiple sensed tracks, enabling closer packing of data with minimal guard space.

Multichannel digital recording system with multi-user detection

A system is provided for increasing the brightness and color saturation of a liquid crystal display to permit direct sunlight viewing which includes the utilization of an array of diffractive color separation microlenses which serve both to spatially separate incoming white light into red, green and blue bands which do not overlap and to focus the bands onto a subpixel matrix such that each of the sub-pixels is illuminated with only one color. The diffractive color separation is made possible through the utilization of the iterative genetic algorithm which specifies the stepped surface of the lens that provide for exceptionally fine color separation. In one embodiment the genetic algorithm is applied iteratively to define the optimal stepped surfaces which are utilized to focus the various colors at different positions at the focal plane of the lens. The subject system improves the overall transmission efficiency of 5% for a standard liquid crystal display to in excess of 30% overall efficiency. This results in lower power requirements or alternatively a brighter display such that the displays are sunlight viewable and have application in lap top computers, cockpit displays, automobile instrument displays, ATM displays, projection displays, equipment displays, and in general any display of a color LCD nature which is to be viewed in direct sunlight.

Color liquid crystal display having diffractive color separation microlenses

A high brightness, high color saturation liquid crystal display permits direct sunlight viewing. The display includes one or more diffractive color separation microlenses, in one embodiment, trimodal, which serves both to spatially separate incoming white light into red, green and blue bands and to focus the bands onto a subpixel matrix. A stepped and segmented surface of at least one microlens enables that microlens to provide a plurality of diffraction patterns.

Sunlight viewable color liquid crystal display using diffractive color separation microlenses

A trimodal microlens configuration is provided for the lenses in a microlens array utilized as a diffraction separator for generating separated bands of different color when the microlens array is provided with a collimated light source. To provide the trimodal functionality, each microlens is divided up into three segments, with the center segment providing a red, green, blue diffraction pattern, with the left segment providing a blue, red, green diffraction pattern, and with the right segment providing a green, blue, red diffraction pattern. This pattern is directed towards an adjacent liquid crystal color display in which its sub-pixels are arranged red, green, blue, with the green sub-pixel aligned with the center segment of the corresponding lens. The result of the trimodal lens is an overlapping of illumination for each of the sub-pixels in that the lens segment aligned with the particular colored sub-pixel provides one third of the light, with the other two thirds of the light being provided by adjacent segments of the lenses in the microlens array. The result of the overlapping illumination of the sub-pixels is that the viewing direction is symmetric about a normal to the array which makes the design of the diffuser used with liquid crystal displays quite simple and eliminates off-axis dead zones. The trimodal structure of the microlens also permits fabrication of a thin lens which minimizes the number of steps for a diffraction line and thus limits the number of etching steps required as well as making the etching process easier to control.

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Hollis, NH, United States of America

Michael Schmidt