Abstract:
A display device has current-addressed pixels, with the currents being supplied by driver circuitry which comprises a transistor (10) for applying a charging voltage to a switched capacitor arrangement (Ci, S1, S2) arranged to selectively charge and discharge the capacitor (Ci) at a predetermined rate to a charging voltage. A transistor control voltage (Vref) is applied to a control terminal of the transistor which is adjusted depending on the transistor threshold voltage to ensure that the capacitor (Ci) is charged to the charging voltage irrespectively of the value of the threshold voltage. This enables an accurately controllable current to be provided which is used to drive the current-addressed pixels.
Abstract:
A wireless terminal has an antenna arrangement including one or more antennas (102a, 102b) designed to reduce substantially currents flowing on ground conductors (104a, 104b, 104c) within the device. In known terminals, these currents generate radiation of unwanted polarisations and radiation in unwanted directions, and can also reduce radiation efficiency. The antenna arrangement of the present invention employs antennas (102a, 102b) having an electrical length of slightly more than half a wavelength. The feed currents drawn from the ground conductors (104a, 104b, 104c) are then out of phase with the current flowing on most of the antenna and therefore cancel with induced currents. The total current flowing in the ground conductors (104a, 104b, 104c) is reduced, thereby minimising radiation from these conductors and improving overall radiation characteristics. Further, the input impedance of the antenna (102a, 102b) remains reasonable.
Abstract:
A method of entering melodic information into a terminal (SS1) having an audio capability, such as a portable telephone having a ringer (34), in which the information is entered as an unstructured character string of ASCII characters. Each byte of 4 characters comprises 2 characters representing a note and 2 characters representing a duration of that note. The information may be entered using a keypad (28) on the terminal or over the air from a remote terminal (PS). Short form methods are disclosed for handling repeat sequences of notes and their durations. Optionally a volume indicator may be included in the unstructured character string for use in setting the relative volume of the reproduced melodic information.
Abstract:
An optical transducer according to the invention comprises optical detection means (1) including a first (1A), a second (1B), a third (1C) and a fourth optical detector (1D), such that a first imaginary line (2a) from the third optical detector (1C) to the first optical detector crosses a second imaginary line (2b) from the second optical detector (1B) to the fourth optical detector (1D). The optical detectors generate detection signals (A,B,C,D) in response to an intensity of radiation incident thereon. The optical transducer further comprises signal combination means (4) for generating a first, a second, a third and a second combination signal. The first and the second combination signals (ACnull, ACnull) are indicative for the sum of the electrical detection signals (A,C) of the first (1A) and the third optical detector (1C). The third (BDnull) and the fourth combination signal (BDnull) each are indicative for the sum of the electrical detection signals (B,D) of the second (1B) and the fourth optical detector (1D). The first (ACnull) and the second combination signal (ACnull) have a mutually opposite phase. The third (BDnull) and the fourth combination signal (BDnull) also have a mutually opposite phase.
Abstract:
A method of reconfiguring the software interface in software defined radios in which when a transmitting station (PS) sends a reconfiguration software message to a receiving station (SS), the receiving station responds with a message giving an estimated time duration for carrying-out the reconfiguration of its software. The transmitting station listens for the estimated time duration for a message which confirms that the receiving station has been successfully reconfigured and commences normal communications using the new configuration. The estimated time duration may be computed using indicia present in the reconfiguration software message.
Abstract:
A transistor substrate for a liquid crystal display comprises an array of insulated-gate staggered TFTs and a capacitor (36) associated with each transistor. The gate insulator (400,420) comprises a first inorganic layer (400) and a second, polymer or spin-on glass layer (420), of which layers only the polymer or spin-on glass layer (420) extends to the capacitor (36) to define the capacitor dielectric.
Abstract:
A charge pump circuit (1) comprises a series of voltage boosting stages (11), each stage (11) comprising a switching means (10) and a capacitive element (12) connected in series between the input to the stage and a respective voltage control terminal (14,15). The voltage control terminals (14,15) comprise at least two groups of terminals receiving respective timed control voltages, and adjacent stages (11) are associated with different terminal groups. The switching means (10) of one or more stages (11) comprises a lateral PIN junction diode. The use of diodes enables the charge pump circuit itself to operate from a lower supply voltage than is possible with the use of TFTs. The use of lateral PIN diodes enables the charge pump circuit to be formed using the same processing as may be required for TFT's of the circuit to which the boosted voltage is supplied. This enables the charge pump circuit to be formed on a common substrate with higher voltage TFT circuitry for, for example, an AMLCD.
Abstract:
A method of communicating data from a data source (10) on one bus system (1) to a data sink (30) on another bus system (3) whose cycle rate is similar to but not synchronised with that of the first bus system comprises the steps of determining the tolerances with respect to frequency between the first and second bus cycle periods, assembling the data for transmission into packets, allocating a variable size, dependent on the tolerances, data payload to the packets, and including within the packets a header indicating the size of the payload. The receiving bus (3) receives these packets and extracts the data payload from the packets using the packet header indication of the size of the data payload.
Abstract:
In a system for controlling an apparatus having a dedicated user interface, where parts of the dedicated user interface communicate with each other using a dedicated user interface message protocol, the system comprises a browser adapted to display a generic user interface, to issue requests due to user interaction with the generic user interface and to accept notifications comprising data or events. A translation system is configured to receive issued requests, to translate the requests and to communicate them using the dedicated user interface message protocol to one of the parts of the dedicated user interface, and to receive communications from the parts of the dedicated user interface using the dedicated user interface message protocol, to translate the communications into notifications and to pass them to the browser.
Abstract:
A portable location alarm device is provided which allows a user to preset an alarm event to occur when the device arrives at a pre-determined location. The alarm event alerts the user by audible, visual or vibrating means. The alarm device determines it's actual location using GPS data. In one embodiment the user bookmarks particular locations while physically present at a given location. Part of the bookmarking process involves the device simultaneously receiving GPS data that describes the physical location. The user can subsequently set an alarm event for any bookmarked location without the need for the device to carry large databases, for example of the type cross-referencing place names to mapping co-ordinates.