Patent application number | Description | Published |
20090109248 | Display Apparatus Having a Multiplicity of Pixels and Method for Displaying Images - A display apparatus has a multiplicity of pixels, having an image signal generation apparatus for generating color and brightness values for the multiplicity of pixels, a light modulation apparatus, which is coupled to the image signal generation apparatus, for the purpose of modulating the multiplicity of pixels on the basis of the color and brightness values, and an illumination apparatus for the purpose of backlighting the light modulation apparatus. The illumination apparatus has a drive apparatus for driving a multiplicity of light sources, and the drive apparatus is coupled to the image signal generation apparatus or to the light modulation apparatus such that a predetermined group of light sources, designed to backlight a subarea of the light modulation apparatus, can be driven by the drive apparatus as a function of the brightness values for contrast enhancement purposes. | 04-30-2009 |
20090251065 | Circuit Arrangement and Method for Operating at Least One LED - A method and a circuit arrangement for operating at least one LED, includes: a first and a second mains connection for connecting a mains voltage; a first rectifier, whose rectifier input is coupled to the mains connections and at whose rectifier output the rectified mains voltage can be provided; an electronic pump switch coupled to the rectifier output, defining a pump node; a main energy store coupled to that side of the electronic pump switch which faces away from the rectifier output; an inverter coupled to the main energy store supplied with energy therefrom. The inverter provides an inverter voltage at its inverter output which has an inverter frequency; a pump network coupling the inverter output to the pump node; a matching network, via which coupling the inverter output to the connection terminals for at least one LED, wherein the matching network has a resonant circuit having a natural frequency. | 10-08-2009 |
20090273291 | Circuit Apparatus With a High-Side Buck Transistor - The invention provides a cost-effective driver circuit for an LED background lighting unit (BLU). For this purpose, a buck circuit with an upper transistor (T | 11-05-2009 |
20100026193 | LED Module with Dedicated Color Regulation and Corresponding Method - An LED module for backlighting a screen comprising at least one LED, (LR, LG | 02-04-2010 |
20100066253 | Led Module - An LED module ( | 03-18-2010 |
20100073965 | Self-Oscillating DC-DC Converter and Method Therefor - A self-oscillating DC/DC converter comprising: a first and a second input connection for application of an input DC voltage; a first and a second bipolar transistor, wherein each bipolar transistor has a control electrode, a reference electrode and a working electrode; at least one first coupling capacitor; wherein a first switching junction is formed by the junction of the working electrode and the reference electrode of the first bipolar transistor, and a second switching junction is formed by the junction of the working electrode and the reference electrode of the second bipolar transistor, wherein the first and the second switching junctions are connected in series with respect to the input DC voltage; a rectifier, with an output that is coupled to a first and a second output connection in order to provide an output DC voltage; a transformer, which has a primary winding, a secondary winding and at least one control winding; wherein the primary winding is coupled between a galvanic connection of the first and the second switching junction and the at least one coupling capacitor; wherein the secondary winding is coupled to the input of the rectifier; wherein each bipolar transistor has an associated control winding which is coupled to the control electrode of the respective bipolar transistor and at least one timer, which is coupled between the respectively associated control winding and the respective control electrode. | 03-25-2010 |
20100117536 | Control Circuit and Method for Controlling Large-Scale Semiconductor Light Sources - A drive circuit for driving semiconductor light sources having one or more semiconductor light sources applied to a circuit mount, wherein the drive circuit for driving semiconductor light sources is also applied to the circuit mount and can generate pulses with a rise time of less than 3 μs. | 05-13-2010 |
20100134037 | Light Source Emitting Mixed-Colored Light and Method for Controlling the Color Locus of Such a light Source - A light source ( | 06-03-2010 |