Did You Know...
...that the Band-Aid Bandage was invented by a Johnson & Johnson employee whose wife had cut herself? Earl Dickson's wife was rather accident prone, so he set out to develop a bandage that she could apply without help. He placed a small piece of gauze in the center of a small piece of surgical tape, and what we know today as the Band Aid bandage was born!
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| Number | Title | Issue Date |
| 8188685 | Light-generating system A light-generating system including a LED load array having a number of light-emitting diodes, and a heat sink on which the LED load array is mounted. The system also includes a power control unit electrically connected to the power source and the LED load array, fo... | 05/29/2012 |
| 8174212 | LED string driver with light intensity responsive to input voltage A driving arrangement for a plurality of light emitting diodes (LEDs), the driving arrangement constituted of: a plurality of serially connected first LEDs coupled to a source voltage; a plurality of first electronically controlled switches, each associated with a p... | 05/08/2012 |
| 8159152 | High-power LED lamp A high-power light-emitting diode (LED) lamp has a plurality of units. Each unit includes an LED die and a thermo-electric cooling device coupled to the LED die. A power source supplies a fixed current to the thermo-electric cooling device wherein the fixed current ... | 04/17/2012 |
| 8159153 | LED light sources with improved thermal compensation A compound light source that compensates for changes in electrical conversion efficiency with increasing operating temperature is disclosed. The compound light source generates light of a design intensity at a design temperature in response to a drive current flowin... | 04/17/2012 |
| 8120286 | Control system for fluorescent light fixture A ballast module regulates power output to a fluorescent light. The ballast module includes a component. A temperature sensor senses temperature of the component. A control module adjusts power output to the fluorescent light based on the temperature of the componen... | 02/21/2012 |
| 8111020 | Apparatus and method for driving backlight unit The present invention is directed to a drive apparatus for a backlight unit (20) in which plural LED (Light Emitting Diode) elements are cascade-connected every three primary colors, which comprises a signal generating unit (44) for generating a signal... | 02/07/2012 |
| 8080949 | HID ballast with integrated voltage multiplier and lamp temperature compensation The present invention relates to temperature compensation of HID lamps in automobiles. The invention concerns the manner in which the temperature of the HID lamp is accounted for in order to drive the lamp is at appropriate power from hot to cold conditions. In the ... | 12/20/2011 |
| 8076871 | Driver apparatus for a gas discharge lamp A driver apparatus (100) for driving a gas discharge lamp (L) comprises a commutator circuit (5) having a bridge topology with four switches (T1-T4) controlled by a controller (6), with an inductor (L2) arranged in series wi... | 12/13/2011 |
| 8008874 | Brightness adjusting device and brightness adjusting method A brightness adjusting device has: a warm-up time determining unit which calculates a temperature difference between the outside temperature detected by an outside temperature detecting unit and the inside temperature detected by an inside temperature detecting unit... | 08/30/2011 |
| 7994738 | Display driving circuit A display driving circuit includes a temperature compensation adjustment circuit, a control circuit, a full bridge circuit, and a transformation circuit. The temperature compensation adjustment circuit provides a current signal for the control circuit. The value of ... | 08/09/2011 |
| 7990078 | Lighting control system having a trim circuit A lighting control system suitable for a surgical lighting device. The lighting control system includes circuitry that compensates for the effects of temperature changes in a lighting device, and that compensates for forward voltage variations among LED lighting mod... | 08/02/2011 |
| 7986112 | Thermally self-stabilizing LED module An improved LED module that is thermally self-stabilizing, and that is able to be retrofitted into an existing flashlight is provided. In one embodiment, the LED module includes a light emitting diode, an amplifying circuit and a microchip. The amplifying circuit in... | 07/26/2011 |
| 7940015 | Thermal protection for lamp ballasts The output current of a ballast is dynamically limited when an over-temperature condition is detected in the ballast according to one of (i) a step function or (ii) a combination of step and continuous functions, so as to reduce the temperature of the ballast while ... | 05/10/2011 |
| 7868563 | Light emitting device drive circuit and vehicle lamp using the same A light emitting device drive circuit includes: a power conversion unit for receiving an input electric power and performing an electric power conversion on the input electric power in accordance with a control signal so as to generate the predetermined output curre... | 01/11/2011 |
| 7812553 | LED lighting device and method for controlling the same based on temperature changes A Light Emitting Diode (LED) lighting device capable of correcting changes in a wavelength of light output from an LED element caused by changes in temperature, and a method for controlling the same are provided. The lighting device includes a temperature-current co... | 10/12/2010 |
| 7795822 | Light source controller and image display device A light source controller includes a light source driver, a light amount sensor, a memory configured to store property information indicating a relationship between the drive current and the outgoing light amount for each level of the environmental temperature of th... | 09/14/2010 |
| 7777430 | Light emitting diode replacement lamp Thermal management and control techniques for light emitting diode and other incandescent replacement light technologies using a current controller are disclosed. ... | 08/17/2010 |
| 7719212 | Display device having a variable AC source When there is a temperature difference along the length of a cold cathode tube used as a light source for a display device, a cataphoresis phenomenon occurs due to movement of mercury enclosed contained within the tube, thereby shortening the tube life. In order to ... | 05/18/2010 |
| 7701151 | Lighting control system having temperature compensation and trim circuits A lighting control system suitable for a surgical lighting device. The lighting control system includes circuitry that compensates for the effects of temperature changes in a lighting device, and that compensates for forward voltage variations among LED lighting mod... | 04/20/2010 |
| 7675250 | Thermal protection for lamp ballasts The output current of a ballast is dynamically limited when an over-temperature condition is detected in the ballast according to one of (i) a step function or (ii) a combination of step and continuous functions, so as to reduce the temperature of the ballast while ... | 03/09/2010 |
| 7675249 | Apparatus and method for driving backlight unit The present invention is directed to a drive apparatus for a backlight unit (20) in which plural LED (Light Emitting Diode) elements are cascade-connected every three primary colors, which comprises a signal generating unit (44) for generating a signal... | 03/09/2010 |
| 7663326 | Temperature dependant LED current controller The present invention provides a controller for regulating current in LEDs in electronic displays. The controller uses temperature sensing diodes to detect changes in the LED ambient temperature. As the LED ambient temperature changes, the forward voltage of the tem... | 02/16/2010 |
| 7635957 | LED temperature-dependent power supply system and method A LED based lighting system (20) employs a LED load temperature sensor (40) for generating a temperature-sensing signal (TSS) indicative of an operational temperature of the LED load (10), a LED current sensor (50) for generating a curren... | 12/22/2009 |
| 7626346 | LED circuit with current control Circuit for regulating a current applied to an electrical load, comprising a compensation unit comprising a temperature sensor and providing an electrical signal at an output, the electrical signal depending on the current applied ... | 12/01/2009 |
| 7615941 | Apparatus and method for maximizing the longevity of arc tube bulbs during pulsing operation Heating or powering a filament less light bulb, and preferably a High Intensity Discharge light sufficiently close to steady state temperature and then pulsing the current, thereby improving and or maximizing the life of the bulb, reducing the power draw during puls... | 11/10/2009 |
| 7538499 | Method and apparatus for controlling thermal stress in lighting devices The present invention provides a method and apparatus for controlling the thermal stress in lighting devices, for example light-emitting elements, that are exposed to large thermal gradients typically upon start-up, for example light-emitting elements operating in r... | 05/26/2009 |
| 7449846 | Ballast for a gas discharge lamp and a method of controlling this ballast A ballast that comprises a DC-DC converter, a DC-AC converter, a lighting voltage generator and a control unit. A difference in voltage between input terminals of the lighting voltage generator is generated by a voltage step-up circuit of the “self-boosting” typ... | 11/11/2008 |
| 7446489 | Apparatus and method of driving light source for display device An apparatus of driving a light source for a display device is provided. The apparatus includes a temperature sensor (940) sensing a temperature and generating an output voltage based on the sensed temperature, a buffer (950) generating an output signa... | 11/04/2008 |
| 7439683 | Backlighting system for display screen A circuit board on which the electronic components providing power to a series of light sources is positioned as near as possible to light sources in order to minimize parasitic energy losses which would be introduced by lengths of wiring. The light sources are usua... | 10/21/2008 |
| 7436131 | Thermal protection for lamp ballasts The output current of a ballast is dynamically limited when an over-temperature condition is detected in the ballast according to one of (i) a step function or (ii) a combination of step and continuous functions, so as to reduce the temperature of the ballast while ... | 10/14/2008 |
| 7432662 | Circuit arrangement and method for operating at least one lamp The present invention relates to a circuit arrangement for operating at least one lamp (LA), which has a first filament (W1) and a second filament (W2), it comprising an apparatus (10) for determining a variable which is correlated with the temp... | 10/07/2008 |
| 7427838 | Light source controlling circuit and portable electronic apparatus A light source controlling circuit controls a light source outputting continuous light. The light source controlling circuit has a power supply circuit supplying an electric power to the light source, a light source monitoring circuit monitoring a state of the light... | 09/23/2008 |
| 7420338 | Ballast control IC with minimal internal and external components A ballast controller integrated circuit which executes a specific set of instructions via an integrated state diagram architecture to control a fluorescent lamp or high intensity discharge lamp and protect the ballast. The state diagram architecture controls powerin... | 09/02/2008 |
| 7414370 | Increasing reliability of operation of light emitting diode arrays at higher operating temperatures and its use in the lamps of automobiles A lamp in which a LED array is coupled to a transistor such that the same amount of current flows through both. The voltage level at the control (e.g., base) terminal of the transistor is controlled such that the current magnitude is reduced when the operating tempe... | 08/19/2008 |
| 7396145 | Backlight unit and method for equalizing brightness thereof A backlight module includes at least a light source generator, a housing, at least a thermal detector, and an inverter. The thermal detector is disposed in the housing for measuring the temperature within the housing when the light source generator is operating, and... | 07/08/2008 |
| 7397201 | DC digital starting device A DC digital starting device includes a voltage-increasing circuit, a first feedback control circuit, a frequency-varying circuit, and a second feedback control circuit. The voltage-increasing circuit provides a voltage for a load in a starting state and a normal wo... | 07/08/2008 |
| 7397204 | Starting circuit for electric discharge lamp A starting circuit for an electric discharge lamp providing an electric current to a lamp having a first and a second filament. The circuit measures a lamp current and a filament temperature and then compares these against a reference voltage. When the lamp current ... | 07/08/2008 |
| 7372211 | Cold cathode tube lighting device and driving method and integrated circuit to be used in same A cold cathode tube lighting device is provided which is capable of obtaining stable luminance when a cold cathode tube is driven by applying voltages to input terminals on both ends of the cold cathode tube. A first current flowing through each of transformer secon... | 05/13/2008 |
| 7372217 | Device for driving a light source module A driving device for driving a light source module (22) includes an inverter circuit (21), a signal sensing circuit (23), a microcontroller (24), and a control circuit (25). The inverter circuit converts a received power signal to ... | 05/13/2008 |
| 7355348 | Ballast for a discharge lamp having a continuous-operation control circuit The invention relates to a novel ballast for a discharge lamp, in which a continuous-operation control circuit is brought out of operation when a physical operation, which defines a preheating time, of a preheating timer has as yet not been sufficiently returned if ... | 04/08/2008 |
