Abstract:
The invention relates to a passive matrix display (10,10') for displaying at least one predetermined sign (15,15'), comprising a carrier element (20) and a cover element (30), a plurality of elongated and generally parallel arranged conductive first strip- elements (21) and second strip-elements (31), a plurality of pixel elements (40), wherein the first strip-elements (21) and the second strip-elements (31) form a grid like structure (50), wherein the pixel elements (40) are connected to the grid like structure (50) and wherein the pixel elements (40) are only applied to those crossings of the first strip- elements (21) and the second strip-elements (31), necessary to form the at least one predetermined sign (15,15').
Abstract:
Devices (10) for driving loads (20) such as organic/inorganic light emitting diodes are provided with drivers (11) for driving the loads (20), with converters (12) for converting first parameter signals defining parameters of the loads (20) into second parameter signals each being defined by one bit per time interval, and with digital controllers (13) for controlling the drivers (11) in response to the second parameter signals. The converter (12) may comprise a comparator circuit (40) and a timer circuit (41) for comparing the first parameter signal with a reference signal and for generating the second parameter signal having a respective first or second value of two possible values in case of a respective first or second comparison result. The parameter may be a current flowing through or light emitted by at least a part of the load (20). The driver (11) may be a buck / boost / buck boost / fly back converter.
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:
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:
The invention relates to an electroluminescent device for emitting light having an adjustable color point. An electroluminescent region (1) emits light in response to a lighting current and a heating element (7) applies heat to the electroluminescent region (1). A heating control unit (9) controls the heating element (7) in applying the heat in order to adjust the color point of the emitted light. The color point of the light emitted by the electroluminescent device is dependent on the temperature of the electroluminescent region (1). Since the electroluminescent device comprises a heating element (7) for applying heat to the electroluminescent region (1) and a heating control unit (9) for controlling the heating element (7) in applying the heat, the color point can be adjusted in a simple way by using the heating control unit (9).
Abstract:
The invention relates to an organic light emitting diode segment (100) comprising two organic light emitting diodes (102; 104), wherein the organic light emitting diodes are vertically stacked with their conducting directions pointing in opposed directions, wherein in the stack the organic light emitting diodes (102; 104) are electrically connected to each other by a common shared electrode (112).
Abstract:
The present invention relates to a device and method for controlling the color point of an LED light source (50). Color point control is a most interesting product feature both for white and colored LED light sources. In known methods for the color control of RGB LED light sources use is made of flux and color sensors. However, there are difficulties with respect to sensing quickly changing ambient light, deeply dimmed colors, coordinating the measurements with the switching of the LEDs, and controlling the color in LED light units comprising a number of independent LED lamps, e.g. segmented wall washers and LCD backlights. It is proposed according to the present invention to control the color of the LED light source (50), using a model-based feed forward approach. Factors relating the parameters controlling the LED currents to the brightness for the different colors (and segments) are stored and used for open loop control. A slow-running procedure continuously measures and updates these factors. Whilst the measurements are e.g. synchronized with the PWM, the procedure itself can run considerably slower and updates the factors asynchronously.
Abstract:
Tne present invention relates to a method for manufacturing an OLED device (10), particularly a large area OLED device, comprising at least an emissive layer (16), a transparent conductor layer (18) with a surface area and a grid unit (20) having grid elements (22, 24) provided on the surface area of the conductor layer (18), comprising the steps of : modeling the current distribution of the OLED device (10) without the grid unit (20), and designing the grid unit (20) such that its grid elements (22) are non-uniformly arranged on the conductor layer (18) as to minimize inhomogeneities of the current distribution in the emissive layer (16). The invention also relates to such an OLED device.
Abstract:
The present invention relates to a supply circuit for supplying an output signal to a load, in particular for supplying a DC output current (Io) to an electronic lamp unit (LE), comprising: an input circuit (1) comprising input terminals (10, 11) for receiving an input supply signal (Us), a transistor H-bridge circuit (12) having separately controllable transistors (T1, T2, T3, T4) for converting said input supply signal (Us) into a pulse signal (Ul), and an inductance circuit (Li) coupled between an input terminal (10, 11) and a H- bridge circuit input terminal (121), an output circuit (2) comprising a resonance circuit (Cs, Ls), a transformer (Tr) and an output rectifier circuit (B2), in particular a full bridge rectifier circuit, for converting said pulse signal (Ul) into said output signal (Io), and output terminals (20, 21) for outputting said output signal (Io) to said load (LE), a control circuit (3) for generating control signals (si, s2) for controlling the transistors (T1, T2, T3, T4) of said transistor H-bridge circuit (12).
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.