Patent
Solid state illumination system
Rakesh Roshan,Benjamin James Hadwen,David James Montgomery,Jonathan Heffernan +3 more
- 23 Mar 2008
102
TL;DR: In this article, an illumination system consisting of at least two light sources (101,102,103) having different emission spectra to one another, a detection circuit (131,132,133) for sensing a light intensity using at least one of the light sources as a photosensor; and driving means (161,162,163) for driving the light source in dependence on the sensed spectral distribution of light.
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Abstract: An illumination system comprises at least two light sources (101,102,103) having different emission spectra to one another; a detection circuit (131,132,133) for sensing a light intensity using at least one of the light sources as a photosensor; and driving means (161,162,163) for driving the light source in dependence on the sensed spectral distribution of light. The emission spectrum of a light source with the smallest bandgap overlaps the emission spectrum of a light source with the second-smallest bandgap. The illumination system is possible to measure the intensity of light emitted by the light source with the smallest bandgap by putting the light source with the second-smallest bandgap in detection mode. The illumination system may also sense the spectral distribution of ambient light, to allow the output from the illumination system to be adjusted in dependence on the ambient light.
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Citations
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Terminal having plurality of operating modes
Jonathan T. Grunow,Jeffrey Baker,Matthew Skvoretz,Michael Pease,Scott Garmon +4 more
- 08 Jan 2010
TL;DR: In this paper, a terminal having an image sensor array and a plurality of operator selectable operating modes is set forth, where the image sensor arrays can have an associated light source bank.
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Geoffrey B. Rhoads,Hugh L. Brunk,John D. Lord +2 more
- 15 Mar 2013
TL;DR: In this paper, a smartphone is adapted for use as an imaging spectrometer, by synchronized pulsing of different LED light sources as different image frames are captured by the phone's CMOS image sensor.
184
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Illumination devices and related systems and methods
David J. Knapp
- 16 Jun 2014
TL;DR: In this paper, a photo detector, such as a photodiode or an LED or other light detecting device, and one or more LEDs of different colors are implemented using these illumination devices to maintain precise color produced by the blended emissions from such LEDs.
106
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Led lamps with improved quality of light
Aurelien David,Troy A. Trottier,Michael R. Krames +2 more
- 20 Jun 2014
TL;DR: In this paper, the authors have shown that more than 2% of the power in the spectral power distribution is emitted within a wavelength range from about 390 nm to about 430 nm.
98
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Intelligent illumination device
David J. Knapp
- 07 Jul 2010
TL;DR: In this article, an intelligent illumination device is disclosed that uses components in an LED light to perform one or more of a wide variety of desirable lighting functions for very low cost, such as ambient light for a photosensor function, or light from other LEDs in the illumination device to adjust the color mix.
96
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Michael D. Pashley,Thomas M. Marshall +1 more
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TL;DR: In this article, a photodiode is arranged to measure the combined light output which selectively turns off the electrical current to the LEDs so that the photodiodes measures the light output for each color separately in response to the measuring drive pulse.
324
Patent
Illumination control system
Geoffrey Howard Gillett Archenhold,Keith Anderson +1 more
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TL;DR: In this article, a light emitting diode illumination control system is described for driving a current circuit for energizing one or more LED light sources, which includes a control system including a microprocessor arranged to control a pulse amplitude modulated (PAM) voltage controlled current circuit, and may employ a monitor for monitoring at least one ambient condition and a micro processor operable to control the current circuit in response to the monitored condition.
275
Patent
Planar light source device and display device using the same
Seiji Sakai,Akihiro Mori,Takashi Yamaguchi,Toshiyuki Yoneda +3 more
- 14 Jun 2004
TL;DR: In this paper, a planar light source device is characterized by including a refracting element disposed parallel to the row of point light sources and between the point light source and the hollow region for refraction.
191
Patent
Lighting system including photonic emission and detection using light-emitting elements
Paul Jungwirth
- 29 Jul 2005
TL;DR: In this paper, the authors proposed a system and method for generating light using light-emitting elements and detecting the intensity and spectral power distribution of light using the same light emitting elements as spectrally sensitive photodetectors.
152
Patent
Automatic backlight for handheld devices
Paul Henry Dietz
- 03 Apr 2002
TL;DR: In this paper, a capacitive proximity sensor detects active handling of the device and the backlight itself is used as a light sensor, but only in dark lighting conditions, and the system requires only a single additional capacitor and three free I/O pins.
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