Patent application number | Description | Published |
20100029076 | METHOD OF MAKING AN INTERCONNECT STRUCTURE - A damascene process is described using a copper fill process to fill a trench ( | 02-04-2010 |
20100308833 | LIGHTING UNIT WITH COMPENSATION FOR OUTPUT FREQUENCY, AND METHOD FOR DETERMINING OUTPUT FREQUENCY - A method of determining the dominant output wavelength of an LED, comprises determining an electrical characteristic of the LED which is dependent on the voltage-capacitance characteristics, and analysing the characteristic to determine the dominant output wavelength. | 12-09-2010 |
20110080113 | SYSTEM AND METHOD FOR OUTPUT FLUX MEASUREMENT OF A LIGHT EMITTING DIODE - A method of estimating the output light flux of a light emitting diode, comprises applying a drive current waveform to the LED over a period of time comprising a testing period. The forward voltage across the LED is monitored during the testing period, and the output light flux is estimated as a function of changes in the forward voltage. | 04-07-2011 |
20110084701 | TESTING OF LEDS - A method of determining the ageing characteristics of an LED comprises applying a current stress pulse to the LED. The LED is monitored to determine when the thermal heating induced by the current stress pulse has been dissipated to a desired level. The operational characteristics of the LED are then measured before applying the next stressing pulse. | 04-14-2011 |
20110109897 | MEASURING APPARATUS - An apparatus comprising at least one measuring cell ( | 05-12-2011 |
20110121705 | APPARATUS FOR REGULATING THE TEMPERATURE OF A LIGHT EMITTING DIODE - Apparatus for regulating the temperature of a light emitting diode (LED). The apparatus includes a heat sink, an LED mount, and an LED mounted on the LED mount. The LED mount is configured to change shape in response to a change in temperature. The change in shape alters the position of the LED relative to the heat sink, for adjusting heat transfer between the LED and the heat sink. The LED mount may include a laminated portion such as a bi-metallic strip. | 05-26-2011 |
20110133214 | LIGHT SENSOR DEVICE AND MANUFACTURING METHOD - A light sensor device comprises a substrate ( | 06-09-2011 |
20110150028 | SELF-CALIBRATION CIRCUIT AND METHOD FOR JUNCTION TEMPERATURE ESTIMATION - The present invention relates to a calibration circuit, computer program product, and method of calibrating a junction temperature measurement of a semiconductor element, wherein respective forward voltages at junctions of the semiconductor element and a reference temperature sensor are measured, and an absolute ambient temperature is determined by using the reference temperature sensor, and the junction temperature of the semiconductor element is predicted based on the absolute ambient temperature and the measured forward voltages. | 06-23-2011 |
20120001570 | METHOD OF CONTROLLING AN LED, AND AN LED CONTROLLER - A method is disclosed of controlling a LED, comprising driving the LED with a DC current for a first time, interrupting the DC current for a second time such that the first time and the second time sum to a period, determining at least one characteristic of the LED whilst the DC current is interrupted, and controlling the DC current during a subsequent period in dependence on the at least one characteristic. The invention thus benefits from the simplicity of DC operation. By operating at the LED in a DC mode, rather than say in a PWM mode, the requirement to be able to adjust the duty cycle is avoided. By including interruptions to the DC current, it is possible to utilise the LED itself to act as a sensor in order to determine a characteristic of the LED. The need for additional sensors is thereby avoided. | 01-05-2012 |
20120086335 | EXTERIOR VEHICLE LIGHTS - A lighting system for exterior lights of an automobile comprises a first lighting unit ( | 04-12-2012 |
20120105311 | Display Device - A display device comprises a substrate which carries an array of pixels. Each pixel comprises an array of apertures in the substrate, each aperture of the array having a maximum opening dimension less than the wavelength of the light to be transmitted through the aperture. The effective dielectric constant of the aperture and/or the dielectric constant of the substrate is varied, thereby to vary the light transmission characteristics of the pixel between transmission of at least one frequency in the visible spectrum and transmission of substantially no frequency in the visible spectrum. | 05-03-2012 |
20120256645 | CAPACITIVE SENSOR, INTEGRATED CIRCUIT, ELECTRONIC DEVICE AND METHOD - A sensor for sensing an analyte includes capacitive elements, each having a pair of electrodes separated by a dielectric wherein the dielectric constant of the dielectric of at least one of the capacitive elements is sensitive to the analyte, the sensor further including a comparator adapted to compare a selected set of capacitive elements against a reference signal and to generate a comparison result signal, and a controller for iteratively selecting the set in response to the comparison result signal, wherein the sensor is arranged to produce a digitized output signal indicative of the sensed level of the analyte of interest. An IC comprising such a sensor, an electronic device comprising such an IC and a method of determining a level of an analyte of interest using such a sensor are also disclosed. | 10-11-2012 |
20120290241 | METHOD OF CHARACTERISING AN LED DEVICE - A method of characterising an LED, as well as an integrated circuit using this method, based on a so-called characteristic resistance, in which the LED is operated at a first, relatively low, operating current and then at a second, relatively high, operating current. From the ratio between the difference between the forward voltages at these two operating currents, and the difference between the operating current, the characteristic resistance is determined. The characteristic resistance is measured at two or more moments during the operational lifetime of the device, and a prediction or estimate is made in relation to the total operational lifetime of the devices, from the evolution or change of the characteristic resistance. | 11-15-2012 |
20140102172 | INTEGRATED CIRCUIT COMPRISING A THERMAL CONDUCTIVITY BASED GAS SENSOR - An integrated circuit and a method of making the same. The integrated circuit includes a semiconductor substrate. The integrated circuit also includes a relative humidity sensor on the substrate. The relative humidity sensor includes a first sensor electrode, a second sensor electrode, and a humidity sensitive layer covering the first and second electrodes. The integrated circuit further includes a thermal conductivity based gas sensor on the substrate. The thermal conductivity based gas sensor has an electrically resistive sensor element located above the humidity sensitive layer. | 04-17-2014 |