摘要:
The invention disclosed herein is an in-circuit security system for electronic devices. The in-circuit security system incorporates identity credential verification, secure data and instruction storage, and secure data transmission capabilities. It comprises a single semiconductor chip, and is secured using industry-established mechanisms for preventing information tampering or eavesdropping, such as the addition of oxygen reactive layers. This invention also incorporates means for establishing security settings, profiles, and responses for the in-circuit security system and enrolled individuals. The in-circuit security system can be used in a variety of electronic devices, including handheld computers, secure facility keys, vehicle operation/ignition systems, and digital rights management.
摘要:
This invention describes a system and methods for media content subscription service distribution; typical services include cable television, premium content channels, pay-per-view, XM radio, and online mp3 services. Subscribers use portable electronic devices to store digital certificates certifying the subscriber's privileges and an assigned public key. The devices can communicate with specially enabled televisions, radios, computers, or other media presentation apparatuses. These, in turn, can communicate with central databases owned by the provider, for verification purposes. Methods of the invention describe media content subscription service privilege issuing and use. The invention additionally describes methods for protecting media content transmitted to users with a variety of encryption schemes. The invention also comprises methods for subscribed users to bestow a subset of their privileges to a number of secondary users, with appropriate permission from the media content subscription service provider.
摘要:
The invention disclosed relates to the fabrication of electronic devices. A method for fabricating an electronic device is disclosed, comprising embossing a surface of a work-piece 200, 202 using an embossing tool 204, so as to form a microstructure having at least two levels of thickness contrast on the work-piece surface, and depositing fluid 208 containing a functional material onto the microstructure. In a preferred embodiment, the step of depositing fluid 208 comprises ink-jet printing. An embossing tool 204 for creating a microstructure on a work-piece 200, 202 is also disclosed, the embossing tool 204 comprising a first surface and steps of at least two different heights relative to the first surface.
摘要:
According to a first aspect, the present invention provides a method for forming a semiconductor film comprising a first step of providing a solution comprising a first organic semiconductor and a second organic semiconductor on a surface of a substrate. The solution is then dried to form the semiconductor film so that it comprises discrete domains of the first organic semiconductor in a matrix of the second organic semiconductor which electrically connects adjacent domains of the first organic semiconductor. The first and second semiconductors are of the same conductivity type. The mobility of charge carriers in the domains of the first organic semiconductor is higher than the mobility of charge carriers in the matrix of the second organic semiconductor. In alternative aspects, the present invention provides methods forming similar semiconductor film products but in which a solution of the first organic semiconductor is deposited separately from the second organic semiconductor and dried to form discrete domains. The present invention also provides a semiconductor film such as produced by the above methods in which both the first and second organic semiconductors are thiophenes.
摘要:
Provided is a method of depositing a polythiophene semiconductor on a substrate. First, the semiconductor is dissolved in a solvent comprising a halogen-containing aromatic compound. Then, the resulting solution is ink-jet printed onto the substrate. The method is useful in the production of microelectronic components such as thin film transistor devices.
摘要:
The present invention relates to a self-aligning patterning method which can be used to manufacture a plurality of multi-layer thin film transistors on a substrate.The method comprises firstly forming a patterned mask 20 on the surface of a sacrificial layer 18 which is part of a multi-layer structure 10 which comprises the substrate 12, a conductive layer 14, an insulating layer 16 and the sacrificial layer 18. Unpatterned areas are then etched to remove the corresponding areas of the sacrificial layer, the insulating layer 16 and the conductive layer 14 thereby leaving voids. A layer of dielectric 22 is then deposited over the etched multi-layer structure to at least substantially fill the voids. The deposited dielectric is then etched in order to at least partially expose the sides of the remaining areas 28 of the sacrificial layer. Conductive material 30 is then deposited on the surface of the etched dielectric. Finally, the remaining areas 28 of the sacrificial layer are removed together with any overlying material.The resulting plurality of multi-layer thin film transistors is preferably in the form of an array which may in turn be formed into a display device by coupling each transistor in the array to a light-emitting cell.
摘要:
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a method for communication comprises receiving baseband user data; modulating the baseband user data onto a first plurality of parallel streams based on a first modulation constellation; modulating non-user data onto a second plurality of parallel streams based on a second modulation constellation, wherein the first modulation constellation provides a higher bit-rate than the second modulation constellation; applying an inverse Fourier transform algorithm to the first plurality of parallel streams and the second plurality of parallel streams to produce a set of complex time-domain samples; and transmitting a radio frequency transmission signal based on the set of complex time-domain samples.
摘要:
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises: a receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals; a transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals; and a processor coupled to the transmitter, wherein the processor outputs data for transmission by the transmitter, wherein the processor applies an inverse Fourier transform to the data transmitted by the transmitter, the processor programmed to multiplex upstream information onto an allocated number of the plurality of spectrally overlapping carrier signals based on an allocation instruction received be the receiver.
摘要:
An easily deployed, extremely detection-resistant surveillance method, apparatus, and system are disclosed. Preferred embodiments of the apparatus are adapted for generating and broadcasting pulsed transmissions optimized for electronic tagging, tracking, and “homing” applications. This makes the invention excellent for radiolocating “terrorists”, criminal suspects, vehicles, and etc., under surveillance. The apparatus is well adapted for “high-risk surveillance targets”, where avoiding sophisticated surveillance detection is paramount The invention uses nondescript “stealth packaging” in various preferred form-factors, that can appear, e.g., to be either a protruding bolt-head, a gas-cap, a wheel-balancing lug, or other nondescript automotive or truck part (depending on embodiment). The preferred signal transmission method uses ultra-low power, pulsed transmissions which are generated and encrypted prior to transmission, using (either proprietary or non-proprietary) spread spectrum signal algorithm-based transmission schemes, or other transmission schemes. Very-low-noise signal detection circuits in a base station receive and decrypt signals, to complete the system.
摘要:
Systems for contention-based bandwidth requests in orthogonal frequency division multiplexing (OFDM) systems are provided. In one embodiment, a bidirectional communication system comprises: a multipoint-to-point host; and a plurality of remotes communicatively coupled to the multipoint-to-point host through an OFDM waveform; wherein the multipoint-to-point host is configured to receive the OFDM waveform, the OFDM waveform comprising a plurality of tones transmitted by the plurality of remotes, wherein the plurality of tones are simultaneously received at the host from at least two of the plurality of remotes; wherein a first remote is configured to transmit a request for bandwidth to the host on a first tone of the plurality of tones, wherein access to the first tone is contention based; and wherein the multipoint-to-point host transmits information on at least one tone based on whether the host successfully receives the request for bandwidth from the first remote of the plurality of remotes.