Abstract: A light emitting device with at least one LED die, a filter element and a reflective element. The filter element may be configured to preferentially attenuate light passing through the filter element, such that light output has improved color uniformity when compared to similar light emitting devices without a filter element.

Abstract: A light emitting device with at least one LED die, a filter element and a reflective element. The filter element may be configured to preferentially attenuate light passing through the filter element, such that light output has improved color uniformity when compared to similar light emitting devices without a filter element.

Abstract: A light emitting device is disclosed herein. An embodiment of the light emitting device comprises a first plurality of light emitters comprising a first group and a second group, wherein the first group is connectable in series to the second group. A first driver is connected to the first group. A second driver is connectable to the second group. A first voltage comparator is coupled to the first driver, wherein the voltage comparator compares the voltage of the first driver to a predetermined voltage. The light emitting device is in a first state when the voltage of the first driver is below the predetermined voltage. The light emitting device is in a second state when the voltage of the first driver is greater than the predetermined voltage. The light emitting device is in the first state, the first group is connected in series with the second group to form a series circuit between the first driver and a reference voltage.

Abstract: A method for determining the light intensity of a light signal in each of a plurality of spectral bands is disclosed and a method for fabricating a photodetector is also disclosed.

Abstract: A method for determining the light intensity of a light signal in each of a plurality of spectral bands is disclosed and a method for fabricating a photodetector is also disclosed.

Abstract: A light emitting device is disclosed herein. An embodiment of the light emitting device comprises a first plurality of light emitters comprising a first group and a second group, wherein the first group is connectable in series to the second group. A first driver is connected to the first group. A second driver is connectable to the second group. A first voltage comparator is coupled to the first driver, wherein the voltage comparator compares the voltage of the first driver to a predetermined voltage. The light emitting device is in a first state when the voltage of the first driver is below the predetermined voltage. The light emitting device is in a second state when the voltage of the first driver is greater than the predetermined voltage. The light emitting device is in the first state, the first group is connected in series with the second group to form a series circuit between the first driver and a reference voltage.

Abstract: A photodetector and method for making the same is disclosed. The photodetector includes a substrate having first, second, and third photodiodes and first and second pigment filter layers. The first, second, and third photodiodes generate first, second, and third photodiode output signals, respectively, each photodiode output signal being indicative of a light intensity incident on that photodiode and a dark current that is independent of the light intensity. The first and second pigment filter layers overlie the first and second photodiodes while a layer having both the first and second pigment filter layers overlie the third photodiode. An output circuit combines the first and third photodiode output signals to provide a first corrected output signal and combines the second and third photodiode output signals to provide a second corrected output signal.

Abstract: A device and method for producing an enhanced color image of a scene of interest captures a grayscale image of the scene of interest using a flash of infrared light and a color image of the scene of interest without using any flash of infrared light. The grayscale information from the grayscale image and the visible color information from the color image are combined to produce the enhanced color image.

Abstract: An ambient light sensor (ALS) system is described. The ALS system includes a polychromatic color sensor, an analog-to-digital converter (ADC), and a digital processor. The polychromatic color sensor generates a plurality of analog signals from a corresponding plurality of color channels based on a detected ambient light signal. The ADC is coupled to the polychromatic color sensor. The ADC converts the plurality of analog signals to a plurality of digital signals. The digital processor is coupled to the ADC. The digital processor generates a processed light signal. The processed light signal describes a characteristic of the detected ambient light signal. Embodiments of the ALS system provide a more comprehensive characterization of the ambient light, and facilitate control of a device based on the characterization of the ambient light.

Abstract: A light sensor that generates a first output signal indicative of an intensity of light received from a predetermined direction in a first band of wavelengths is disclosed. The light sensor includes a substrate having first and second photodetectors, a first filter layer, and a controller. The photodetectors are sensitive to light in the infrared portion of the optical spectrum as well as to light in the first band of wavelengths, and generate first and second photodetector signals. The first filter layer transmits light in the first band of wavelengths and light in the infrared portion of the optical spectrum while blocking light in a portion of the visible spectrum outside of the first band of wavelengths, without altering light received by the first photodetector. The controller processes the first and second photodetector signals to produce the first output signal that is corrected for infrared in the input light.

Abstract: An imaging device and method for producing an infrared (IR) filtered digital image of a scene of interest uses IR image signals derived from light transmitted through infrared pass filters of a color filter array to remove IR light components of color image signals derived from light transmitted through color pass filters of the color filter array. The color and IR image signals are generated using an image sensor that includes an imaging array and the color filter array.

Abstract: A photodetector and method for making the same is disclosed. The photodetector includes a substrate having first, second, and third photodiodes and first and second pigment filter layers. The first, second, and third photodiodes generate first, second, and third photodiode output signals, respectively, each photodiode output signal being indicative of a light intensity incident on that photodiode and a dark current that is independent of the light intensity. The first and second pigment filter layers overlie the first and second photodiodes while a layer having both the first and second pigment filter layers overlie the third photodiode. An output circuit combines the first and third photodiode output signals to provide a first corrected output signal and combines the second and third photodiode output signals to provide a second corrected output signal.

Abstract: A light sensor that generates a first output signal indicative of an intensity of light received from a predetermined direction in a first band of wavelengths is disclosed. The light sensor includes a substrate having first and second photodetectors, a first filter layer, and a controller. The photodetectors are sensitive to light in the infrared portion of the optical spectrum as well as to light in the first band of wavelengths, and generate first and second photodetector signals. The first filter layer transmits light in the first band of wavelengths and light in the infrared portion of the optical spectrum while blocking light in a portion of the visible spectrum outside of the first band of wavelengths, without altering light received by the first photodetector. The controller processes the first and second photodetector signals to produce the first output signal that is corrected for infrared in the input light.

Abstract: A light source that generates light having an output optical spectrum is disclosed. The light source includes first and second LEDs and a layer of phosphor that is excited by light from the first LED. The layer of phosphor is positioned to convert a portion of the light from the first LED in a first LED optical spectrum to light having a phosphor spectrum. The second LED emits light in a second LED optical spectrum. The first and second LEDs are powered such that the output optical spectrum includes the first and second optical spectrums and the phosphor spectrum such that the output spectrum is more constant as a function of wavelength at wavelengths between 450 nm to 650 nm than the first or second optical spectrums or the phosphor spectrum. The invention can provide a white LED light source with improved color rendering.

Abstract: An ambient light sensor (ALS) system is described. The ALS system includes a polychromatic color sensor, an analog-to-digital converter (ADC), and a digital processor. The polychromatic color sensor generates a plurality of analog signals from a corresponding plurality of color channels based on a detected ambient light signal. The ADC is coupled to the polychromatic color sensor. The ADC converts the plurality of analog signals to a plurality of digital signals. The digital processor is coupled to the ADC. The digital processor generates a processed light signal. The processed light signal describes a characteristic of the detected ambient light signal. Embodiments of the ALS system provide a more comprehensive characterization of the ambient light, and facilitate control of a device based on the characterization of the ambient light.

Abstract: A switch panel having a touch plate, light converter, and light analyzer are disclosed. The touch plate includes an optically transparent layer having first and second surfaces, and having an index of refraction greater than that of air. The touch plate conducts light of an excitation wavelength between the first and second surfaces and emits part of that light through the second surface at one of a plurality of emission locations depending on the position at which pressure is applied to the first surface. The light converter is positioned to receive the light emitted through the second surface and generates light having a plurality of distinct location-specific spectra, one of the location-specific spectra corresponding to each of the emission locations. The light analyzer generates a signal indicative of which of the location-specific spectra was generated by the light converter.

Abstract: A switch panel having a touch plate, light converter, and light analyzer are disclosed. The touch plate includes an optically transparent layer having first and second surfaces, and having an index of refraction greater than that of air. The touch plate conducts light of an excitation wavelength between the first and second surfaces and emits part of that light through the second surface at one of a plurality of emission locations depending on the position at which pressure is applied to the first surface. The light converter is positioned to receive the light emitted through the second surface and generates light having a plurality of distinct location-specific spectra, one of the location-specific spectra corresponding to each of the emission locations. The light analyzer generates a signal indicative of which of the location-specific spectra was generated by the light converter.