Abstract: A method of initializing system components of a wireless-controlled lighting system. The system components include a remote control and a plurality of lighting units which communicate with a control master for the system via commonly-received radio communications. In order to become part of the system, each component transmits a respective request for initialization. A local control master for the system responds to each request, in turn, by allocating and transmitting a unique ID code for the requesting component. It then transmits a verify command to the requesting component which, if it has received the ID code, signals the user affirmatively.

Abstract: A method and ballast for driving a high intensity discharge (HID) lamp include generating a very high frequency driving signal for the HID lamp, generating a low frequency modulating signal, amplitude modulating the driving signal with the modulating signal at a predetermined low initial modulation level, measuring a lamp voltage across the HID lamp, determining a standard deviation of the lamp voltage, comparing the standard deviation with a predetermined minimum level, if the standard deviation is above the predetermined minimum level, incrementally increasing the modulation level and repeating the amplitude modulating step, the measuring step, the determining step and the comparing step, and if the standard deviation is below the predetermined minimum level, maintaining the amplitude modulation at the determined level.

Abstract: A deflection unit of a cathode ray tube is provided with a cooling fan. The fan includes means for reducing the disturbing effect of the electric field generated by the fan on the deflection of the electrons, or the fan is arranged in such a manner that the disturbing effect is small.

Abstract: A method for manufacturing an electron gun for a cathode ray tube. The method comprises a first step in which a number of securing means are made in a planar element (e.g. plate or strip), a second part in which the securing means are secured to an insulating support rod, a third part in which the insulating support rod-securing means assembly is detached from the planar element, whereafter connections are made to a stack of electrodes to form the electron gun.

Abstract: A lighting system comprising a plurality of light-emitting diodes and a current driver for driving current through a plurality of parallel disposed, electrically conductive branches, wherein the branches comprise at least one cell. In each cell, each branch has a light-emitting diode with an anode terminal and a cathode terminal. The anode terminal of each light-emitting diode is coupled to the cathode terminal of a light-emitting diode of an adjacent branch via a shunt. The shunt further comprises a light-emitting diode. A set of corresponding light-emitting diodes together with the shunt couplings define a cell. The branches along with the shunts are coupled in a specifiable lattice arrangement.

Abstract: A semiconductor cathode (11) in a semiconductor structure, in which the sturdiness of the cathode is increased by covering the emitting surface (4) with a layer of a semiconductor material (7) having a larger bandgap than the semiconductor material of the semiconductor cathode. Various measures for increasing the electron-mission efficiency are indicated.

Abstract: A lighting system comprising a plurality of light-emitting diodes and a current driver for driving current through a plurality of parallel disposed, electrically conductive branches, wherein the branches comprise at least one cell. In each cell, each branch has a light-emitting diode with an anode terminal and a cathode terminal. The anode terminal of each light-emitting diode is coupled to the cathode terminal of a light-emitting diode of an adjacent branch via a shunt. The shunt further comprises a light-emitting diode. In each cell, each light-emitting diode may have a different forward voltage characteristic, while still insuring that all of the light-emitting diodes in the arrangement have the same brightness. Upon failure of one light-emitting diode, the remaining light-emitting diodes in the lighting system are not extinguished.

Abstract: A circuit arrangement for supplying a lamp comprises a piezotransformer. During stationary operation the lamp is supplied via the piezotransformer. During ignition a DC-ignition voltage is generated over the secondary side of the piezotransformer acting as capacitor.

Abstract: Picture display device comprising an electron gun with cathodes having an enhanced dissipation of heat by virtue of an enlarged surface or an increase of the emissivity of the surface.

Abstract: A device, e.g., a luminaire, that includes a plurality of LEDs connected in series, and an active shunt arrangement for sensing a failure of one or more of the LEDs and for shunting current that would have otherwise flowed through a failed LED, to thereby maintain a flow of current through remaining ones of the plurality of LEDs. In one exemplary embodiment, the active shunt arrangement includes a plurality of active shunts connected in parallel across respective ones of the LEDs, and remote sense and digital control logic for detecting an open-circuit condition of the normally closed circuit, and for sequentially activating the active shunts until the normally closed circuit has been restored to a closed-circuit condition.

Abstract: An incandescent lamp with a low voltage burner (BM) and integrated voltage conversion means (VCM) having switching elements (Q1, Q2) driven by a separate control circuit (CC) comprising an integrated circuit (IC). The voltage conversion means are suitable for operation at a high temperature and causes only limited amounts of EMI.

Abstract: A triac dimmable electronic ballast having a single stage feedback power factor inverter is configured to isolate the resonant circuit current from a DC bias, or a DC transient caused by activations of the triac. The resonant circuit is driven by a high frequency inverter, and contains a feedback path to a DC storage element. Two DC blocking devices are provided, one between the resonant circuit and the inverter, and one between the resonant circuit and the DC storage element.

Abstract: An image relay arrangement (20) for use with a curved CRT faceplate (11) to relay a picture to a position in front of the faceplate comprises a first, imaging, microlens array (22), a second, field, microlens array (23) and a third, re-imaging, microlens array (24) which are spaced from one another and have corresponding microlens elements (25, 26, 27). At least one of the first and third arrays is curved with its spacing from the adjacent array varying over its area related to the faceplate curvature. Through this arrangement, the picture at the curved faceplate can be imaged onto a plane where, for example, a lenticular screen is located enabling autostereoscopic displays to be produced.

Abstract: A plasma-addressed electro-optical display device comprising a layer of electro-optical material (42), data electrodes (18) coupled to the electro-optical layer (42) to receive data voltages for activating portions of the electro-optical layer (42), and a plurality of plasma channels (20) extending generally transverse to the data electrodes (18) for selectively switching on these electro-optical portions. The plasma channels (20) each comprise spaced elongated cathode (30) and anode (31) electrodes and an ionizable gas filling (44). The cathode (30) and anode (31) electrodes are arranged in groups to reduce the number of drivers (28) required to drive the cathode (30) and anode (31) electrodes. To further reduce the total number of drivers of a PALC display device which has more pixels per row than rows, the plasma channels (20) are interchanged with the data electrodes (18). The plasma channels (20) now extending in the column direction and the data electrodes (18) extending in the row direction.

Abstract: A transmission system for transmitting data between a transmitter and a receiver is disclosed. The transmitted data which are organized in sequences of data units of a source protocol have previously been compressed. According to the invention, as the data contained in each sequence have been compressed, they are transmitted in data fields of data units of a source protocol, and markers are introduced to separate the compressed sequences from each other.

Abstract: A differential threshold comparator is provided which includes an input stage and a threshold stage, both supplied with current by a common current mirror. Both stages are differential comparators, with the input stage having terminals for receiving an input signals and the threshold stage having terminals for receiving a threshold voltage. The threshold comparator produces a signal which indicates whether the difference between input signal voltages exceeds the threshold voltage.

Abstract: In a circuit arrangement for operating a lamp comprising a power feedback and an antiboost switch disabling the power feedback for part of the time, the control of the antiboost switch is realized by means of a very simple and, hence, inexpensive control circuit.

Abstract: The deflection unit has a yoke ring mounted on, and secured to, a coil assembly comprising deflection coils carried on a support. The yoke ring (22) is secured using a flow process in which the coil assembly is rotated about a vertical axis and flowable adhesive, e.g. polyurethane resin, is directed at one end (28) of the yoke ring such that the adhesive (30) flows over its outer surface (24) to its other end, forming a protective coating, and onto an adjacent part (20) of the coil assembly. The adhesive flows also over a substantial portion of the inner surface (23) of the yoke ring in the gap between the yoke ring and the coil assembly providing extensive bonding (32) between the yoke ring and the coil assembly which reduces unwanted noise effects from the unit in subsequent operation.