Patents by Inventor Dennis M. Davey
Dennis M. Davey has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8400391Abstract: Methods and systems for displaying an image on a display device having first and second light sources are provided. A video signal is provided to the display device. The video signal includes first and second video frames. Each video frame includes first and second sub-frames corresponding to the respective first and second light sources. The first light source is operated for a first duration during the first sub-frame of the first video frame. The first light source is operated for a second duration during the first sub-frame of the second video frame. The second duration is different from the first duration.Type: GrantFiled: January 10, 2008Date of Patent: March 19, 2013Assignee: Honeywell International Inc.Inventors: John Schmidt, Kalluri R. Sarma, Dennis M. Davey
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Patent number: 8248556Abstract: A backlight system for a liquid crystal display includes a substantially planar, refractive waveguide having a first major face and a second major face opposite the first major face. The waveguide includes a viewable region corresponding to a viewable area of the liquid crystal display. The system further includes a light source positioned proximate to the second major face and within the viewing region for producing light. An injection feature is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the light into the waveguide such that the light becomes waveguided light. A plurality of extraction features is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the waveguided light out of the waveguide.Type: GrantFiled: July 30, 2010Date of Patent: August 21, 2012Assignee: Honeywell International Inc.Inventors: Brent D. Larson, Dennis M. Davey, Elias S. Haim
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Patent number: 8243006Abstract: Methods and systems for displaying an image on a display device having first and second light sources are provided. A video signal is provided to the display device. The video signal includes a plurality of frames, and each frame includes first and second sub-frames corresponding to the respective first and second light sources. The first light source is operated for a first duration during the first sub-frame of each of the plurality of frames. The second light source is operated for a second duration during the second sub-frame of each of the plurality of frames. The second duration is different than the first duration.Type: GrantFiled: November 16, 2007Date of Patent: August 14, 2012Assignee: Honeywell International Inc.Inventors: Kalluri R. Sarma, John F. L. Schmidt, Dennis M. Davey
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Publication number: 20100302135Abstract: A backlight system for a liquid crystal display includes a substantially planar, refractive waveguide having a first major face and a second major face opposite the first major face. The waveguide includes a viewable region corresponding to a viewable area of the liquid crystal display. The system further includes a light source positioned proximate to the second major face and within the viewing region for producing light. An injection feature is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the light into the waveguide such that the light becomes waveguided light. A plurality of extraction features is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the waveguided light out of the waveguide.Type: ApplicationFiled: July 30, 2010Publication date: December 2, 2010Applicant: HONEYWELL INTERNATIONAL INC.Inventors: Brent D. Larson, Dennis M. Davey, Elias S. Haim
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Patent number: 7791683Abstract: A backlight system for a liquid crystal display includes a substantially planar, refractive waveguide having a first major face and a second major face opposite the first major face. The waveguide includes a viewable region corresponding to a viewable area of the liquid crystal display. The system further includes a light source positioned proximate to the second major face and within the viewing region for producing light. An injection feature is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the light into the waveguide such that the light becomes waveguided light. A plurality of extraction features is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the waveguided light out of the waveguide.Type: GrantFiled: November 19, 2007Date of Patent: September 7, 2010Assignee: Honeywell International Inc.Inventors: Brent D. Larson, Dennis M. Davey, Elias S. Haim
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Publication number: 20090179848Abstract: Methods and systems for displaying an image on a display device having first and second light sources are provided. A video signal is provided to the display device. The video signal includes first and second video frames. Each video frame includes first and second sub-frames corresponding to the respective first and second light sources. The first light source is operated for a first duration during the first sub-frame of the first video frame. The first light source is operated for a second duration during the first sub-frame of the second video frame. The second duration is different from the first duration.Type: ApplicationFiled: January 10, 2008Publication date: July 16, 2009Applicant: HONEYWELL INTERNATIONAL, INC.Inventors: John Schmidt, Kalluri R. Sarma, Dennis M. Davey
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Publication number: 20090128543Abstract: Methods and systems for displaying an image on a display device having first and second light sources are provided. A video signal is provided to the display device. The video signal includes a plurality of frames, and each frame includes first and second sub-frames corresponding to the respective first and second light sources. The first light source is operated for a first duration during the first sub-frame of each of the plurality of frames. The second light source is operated for a second duration during the second sub-frame of each of the plurality of frames. The second duration is different than the first duration.Type: ApplicationFiled: November 16, 2007Publication date: May 21, 2009Applicant: HONEYWELL INTERNATIONAL, INC.Inventors: Kalluri R. Sarma, John F.L. Schmidt, Dennis M. Davey
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Publication number: 20090128735Abstract: A backlight system for a liquid crystal display includes a substantially planar, refractive waveguide having a first major face and a second major face opposite the first major face. The waveguide includes a viewable region corresponding to a viewable area of the liquid crystal display. The system further includes a light source positioned proximate to the second major face and within the viewing region for producing light. An injection feature is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the light into the waveguide such that the light becomes waveguided light. A plurality of extraction features is proximate to one or more of the second major face and the first major face and within the viewing region to optically couple the waveguided light out of the waveguide.Type: ApplicationFiled: November 19, 2007Publication date: May 21, 2009Applicant: Honeywell International, Inc.Inventors: Brent D. Larson, Dennis M. Davey, Elias S. Haim
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Patent number: 7342577Abstract: Apparatus are provided for driving an LED light source and controlling a light output of the light source over a wide luminance range in response to a luminance input. The apparatus includes: a voltage source having an output configured to couple with the light source, a first input configured to receive the luminance input, and a second input; a photodetector unit configured to logarithmically compress the luminance range and determine a voltage based on a luminance of the light source in the compressed range; a comparator having an input coupled to the photodetector unit and having an output; and, a signal converter having an input coupled to the output of the comparator and having an output coupled to the second input of the voltage source. The voltage source is configured to generate an output signal at the output of the voltage source. The output signal has a frequency and a pulse width based on the luminance input.Type: GrantFiled: January 25, 2005Date of Patent: March 11, 2008Assignee: Honeywell International, Inc.Inventors: Mark A. Struebel, Eric D. Ronning, Dennis M. Davey
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Patent number: 7339332Abstract: Methods and apparatus are provided for a backlit display with variable luminance and chrominance. The apparatus comprises i groups of LEDs of different colors and one or more sensors optically coupled to the LEDs. The combined light produced by the LEDs is directed to a transmissive liquid crystal display, preferably through a diffusing layer. The sensors monitor the output Si of each group of LEDs. Si for each group of LEDs is multiplied by a chrominance determining parameter Ki to obtain Ki*Si which is then compared to a commanded luminance signal LC to obtain LC?Ki*Si, which difference is used to adjust the drive current to each group of LEDs to achieve LC with the desired chrominance set by Ki. By changing Ki and LC the chrominance and luminescence of the display may be varied and aging effects compensated.Type: GrantFiled: May 24, 2004Date of Patent: March 4, 2008Assignee: Honeywell International, Inc.Inventors: Brian D. Cull, Dennis M. Davey, Eric D. Ronning