Abstract: Operating a lighting device by acquiring a target brightness level of at least one solid-state lighting unit, and determining a reference driving current amplitude for obtaining the target brightness level. If the reference driving current amplitude is below an optimum driving current amplitude, the solid-state lighting unit is operated at the optimum driving current amplitude, which is pulse-width modulated to obtain the target brightness level.

Abstract: An illumination device comprising an organic light-emitting diode (1) (OLED) having a light output that changes with use with an illumination/active area (2,3), where light is being emitted for an illumination purpose, a reference area (4) being substantially smaller than the illumination area (2), wherein the reference area (4) is an isolated area (4) not connected to the illumination/active area (2,3), a substrate, on which the reference area (4) and the illumination/active area (2,3) are located, a driver (5) connected to the illumination/active area (2,3) and the reference area (4), with a measurement circuit (6) detecting at least one active value of the illumination/active area (2,3) and at least one reference value of the reference area (4), a control circuit (7), which compares the active and the reference value and produces a correction signal in response thereto to compensate the changes in the light output of the illumination area (2), wherein the control circuit (7) calculates the correction signa

Abstract: The invention relates to a light emitting device (1) with an electronic driver (10) and a planar light emitting element (20), wherein the driver (10) is connected with a source (2) and the light emitting element (20), wherein the light emitting element (20) having an internal capacitance (21) is connected to said driver (10) in such a way that the internal capacitance (21) serves as a passive output filter of the driver (10).

Abstract: Supply circuits (1-3,101-102,201-203) for supplying output current signals to loads (6,106,206) and comprising first circuits (1,101,201) with transistors (11-14,111-112,211-212) for converting input voltage signals into pulse signals and comprising second circuits (2,102,202) with resonance circuits for receiving the pulse signals and for supplying the output current signals to the loads (6,106,206) are provided with third circuits (3,203) for controlling the first circuits (1,101,201), which third circuits (3,203) comprise generators (35-37) for generating control signals for controlling the transistors (11-14,111-112,211-212) for reducing dependencies between the input voltage signals and the output current signals. The third circuits (3,203) supply the control signals in dependence of the input voltage signals and independently from the output current signals. The transistors (11-14,111-112,211-212) may form a full bridge, a full bridge operated in a half bridge mode, or a half bridge.

Abstract: An electroluminescent device. Providing atmosphere lighting is possible by an electroluminescent layer, and a first electrode layer arranged on a of the first side of the electroluminescent layer and a second electrode layer arranged on a second side, opposing the first side of the electroluminescent layer, for supplying charges to the electroluminescent layer, at least one first contact element for contacting the first eletrode layer with a charge supply, at least one second contact element for contacting the second electrode layer with the charge supply, wherein the first and second electric contact elements are arranged asymmetrically to each other such that the intensity of light emitted from the electroluminescent layer varies across its area.

Abstract: To achieve high modulation frequencies when modulating an LED, a circuit-arrangement for modulating at least one LED comprises a modulation-circuit (3) parallel to the LED, wherein the modulation-circuit (3) comprises in a series connection a switching device and a threshold device. In a method for operating an LED, the LED is modulated by alternating the switching device between a closed state and an open state.

Abstract: The present invention relates to a method of compensating an aging process of an illumination device comprising at least one organic light emitting diode (1) (OLED) having a light output that changes with time and a driver (2) connected with the OLED (1) having an individual current-voltage characteristic.

Abstract: The invention relates to light-emitting diodes (O-LED). In particular, it relates to the driver electronics needed for these devices. An organic electroluminescent device is provided, which has a hermetically closed very flat housing. To improve the functionality of an O-LED, considerably reduce the height of an O-LED module and allow a cost-effective mass production, the driver circuit and the electronic driver elements or the printed circuit board (PCH) with the electronic driver elements are incorporated into the cover plate of the device.

Abstract: The present invention relates to an acoustic light-emitting device (10,10?, 10?, 10??, 10??) comprising a sheet-like element (20) with a layer structure, which performs a predetermined operation in response to a signal applied thereto, at least one transducer (40), being the source of the signal by exciting bending waves to the sheet-like element (20), in that the sheet-like element (20) comprises a light-emitting device (30) with at least a first electrode layer (31), a light-emitting layer (32) and a second electrode layer (33).

Abstract: An illumination device comprising an organic light-emitting diode (1) (OLED) having a light output that changes with use with an illumination/active area (2,3), where light is being emitted for an illumination purpose, a reference area (4) being substantially smaller than the illumination area (2), wherein the reference area (4) is an isolated area (4) not connected to the illumination/active area (2,3), a substrate, on which the reference area (4) and the illumination/active area (2,3) are located, a driver (5) connected to the illumination/active area (2,3) and the reference area (4), with a measurement circuit (6) detecting at least one active value of the illumination/active area (2,3) and at least one reference value of the reference area (4), a control circuit (7), which compares the active and the reference value and produces a correction signal in response thereto to compensate the changes in the light output of the illumination area (2), wherein the control circuit (7) calculates the correction signa

Abstract: The invention relates to an electrical apparatus having an actuator including at least two permanent magnets (1, 1a) and at least one electrical coil (2) which is movably supported by means of a swing arm (3), which coil is arranged to be traversed by magnetic fields of the permanent magnets (1, 1a), the actuator having a cage (4), which encloses the coil (2) and the permanent magnets (1, 1a), as a closed magnetic return path.

Abstract: A DC to DC converter converts a DC input voltage into a plurality of DC output voltages and includes a circuit stage having switching elements for converting a DC input voltage into a first AC signal (VAC1). A first resonant circuit converts a first AC signal into a second AC signal which is used for forming a first DC output voltage. A second resonant circuit converts the first AC signal into a third AC signal which is used for forming a second DC output voltage. A control circuit sets various frequency ranges for the first AC signal to set various supply power modes, such as for normal operation and standby mode.

Abstract: The invention relates to a power supply unit for direct current to direct current DC-DC conversion having multiple outputs. Such power converters comprise a DC-AC converter 100, a transformer 200 and a plurality of AC-DC converters 300-i i=1 . . . n each for generating an individual DC-output voltage Vi being provided to a respective load impedance 330-i. Lossy components in said transformer and said AC-DC converters cause undesired voltage drops causing undesired fluctuations of the DC-output voltages. A reduction of said fluctuations of said DC-output voltages is achieved by feeding-back the DC-output voltage of at least one AC-DC converter to said DC-AC converter. Starting from that prior art it is the object of the invention to improve a power supply unit for DC-DC conversion such that a more uniform sharing of the fluctuations of the output voltages is achieved easily and cheaply.

Abstract: The invention relates to an electrical apparatus having an actuator including at least two permanent magnets (1, 1a) and at least one electrical coil (2) which is movably supported by means of a swing arm (3), which coil is arranged to be traversed by magnetic fields of the permanent magnets (1, 1a), the actuator having a cage (4), which encloses the coil (2) and the permanent magnets (1, 1a), as a closed magnetic return path.

Abstract: The invention relates to a DC to DC converter for converting a DC input voltage (1) into a plurality of DC output voltages (14, 21), including