Abstract:
An inspection machine capable of inspecting optical property and electrical property of a light emitting device is provided. The inspection machine includes a substrate table, a probe mechanism, a heating apparatus, a cooling apparatus, an image-sensing apparatus, a temperature-sensing apparatus and a moving mechanism. The probe mechanism is capable of moving toward the light emitting device to contact therewith. The heating apparatus is capable of heating the light emitting device within a first temperature range. The cooling apparatus is capable of cooling the light emitting device within a second temperature range. The image-sensing apparatus senses a light emitting image provided from the light emitting device. The temperature-sensing apparatus senses the present temperature of the light emitting device. The image-sensing apparatus is disposed on the moving mechanism. The moving mechanism is capable of moving the image-sensing apparatus. An inspecting method and an inspecting system for the inspection machine are also provided.
Abstract:
System(s), apparatus(es), and method(s) are provided for control of quality of light emitted from a group of solid-state light (SSL) sources that are part of an illumination fixture. The control is based at least in part on regulation of the spectral power distribution (SPD) of the light to match a SPD of a reference light source. A spectroscopic analyzer collects electromagnetic (EM) radiation emitted from the group of SSL sources and EM radiation substantially emitted from the reference light source. A first controller analyzes spectroscopic data related to SPDs of the group of SSL sources and the reference light source and, based on the analysis issues a configuration of the group of SSL sources. Implementation of the configuration causes the group of SSL sources to emit EM radiation with a SPD that nearly matches the SPD of the EM radiation substantially emitted from the reference light source.
Abstract:
A tray, a testing apparatus and a testing method using the same are disclosed. The testing apparatus includes a tray having a plurality of light sources received therein, the plurality of light sources outputting light when power is applied thereto; a plurality of optical receiver units arranged to correspond to the plurality of light sources and receiving the light outputted from each of the plurality of light sources; a plurality of probe units arranged to correspond to the plurality of light sources and applying power to each of the plurality of light sources; a power supply control unit selectively controlling power applied to the plurality of probe units; and an optical properties analyzing unit analyzing properties of optical signals from the light received by the optical receiver units.
Abstract:
A LED light fixture and a luminous flux monitoring system for a light fixture. The light fixture includes a housing defining an interior space including an interior surface and a transmissive panel. A light source is coupled to the interior surface. The system includes a light sensor coupled to the interior surface and aligned to receive light from the transmissive panel, light source, and/or interior surface. The light sensor is configured to measure luminous flux in the interior space. A controller is coupled to the light source and the light sensor. The controller is configured to determine if a light sensor measurement of luminous flux in the interior space is more or less than a reference value of the luminous flux. If the measurement of luminous flux is less than the reference value, the controller is configured to activate an end-of-life indicator. The reference value equals (total flux−internal ambient flux)×depreciation factor.
Abstract:
A system and method for calibrating light output from an LED is provided. The system includes a support on which an LED is positioned, a photosensor to measure the light output from the LED, and means for calibrating and adjusting the light output of the LED. Calibration is accomplished by measuring the light output from the LED, comparing such output against a reference value, and adjusting the measured output against the reference value.
Abstract:
In a method and a device for detecting the light power emitted by an LED light source, the LED light source is driven with a drive signal corresponding to a binary code. The light emitted by the LED light source is detected by means of a sensor system. The output signal of the sensor system is evaluated in a control and regulating unit. The LED light source is driven with a binary code having an irregular bit sequence.
Abstract:
On-wafer test systems and methods for light-emitting devices, such as light-emitting diodes (LEDs), are provided. The test system may be designed, for example, to characterize the light output from the LED die (e.g., power in Lumens).
Abstract:
In one embodiment, a light measurement is acquired from each of a plurality of illumination zones. Each light measurement is digitized, and values derived from the digitized light measurements are stored, proximate to where the light measurements are acquired. The values derived from the digitized light measurements are then transmitted to a central control system, and light emitted by the illumination zones is regulated based on determinations made by the central control system. In some cases, the light measurements may be acquired and transmitted via a light sensor package having: a light sensor providing an analog output proportional to received light; an analog-to-digital converter to convert the analog output of the light sensor to a digital value; a memory to store a value derived from the digital value; and an addressable communication interface to transmit the stored value to an external control system.
Abstract:
Provided is a backlight unit including one or more white light emitting diodes (LEDs) for generating light; an LED module having a printed circuit board (PCB), the LED module supporting and driving the white LED; a sensor for detecting the color temperature of the white LED; a heat generating element connected to the LED module; and a controller for controlling the sensor, the LED module, and the heat generating element.
Abstract:
A light source having a first mixing chamber, a light pipe structure, and a controller is disclosed. The first mixing chamber includes a first plurality of LEDs, the first mixing chamber having a first transparent window through which light from the first plurality of LEDs exits the first mixing chamber. The light pipe structure has a first end optically coupled to the window such that light from the first plurality of LEDs enters the first end and a second end through which the light exits. The controller determines the power that is applied to the first plurality of LEDs and includes a photodetector optically coupled to the second end of the light pipe structure. The photodetector generates signals indicative of an intensity of light generated by the LEDs, the controller causing the LEDs to be powered such that the signal matches a target value.