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Maxim Integrated Products : Patent Issued for Eliminating Flicker in LED-Based Display Systems (USPTO 9542880)

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01/19/2017 | 05:47pm CET

By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Mariano, Gianluca (San Martino Siccomario, IT); Hariharan, Suresh (Livermore, CA), filed on May 29, 2014, was published online on January 10, 2017.

The assignee for this patent, patent number 9542880, is Maxim Integrated Products, Inc. (San Jose, CA).

Reporters obtained the following quote from the background information supplied by the inventors: "The background description provided here is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.

"Light emitting diode (LED) based display systems are becoming increasingly popular due to many advantages LEDs offer over conventional display systems. For example, LEDs are more power efficient and durable than conventional light bulbs. As a result, LED-based display systems are fast becoming a preferred alternative to conventional display systems used in homes, businesses, and vehicles. Additionally, LED-based display systems such as signs and billboards are gaining popularity for similar reasons."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "A system comprises a driver circuit, a modulator circuit, and a reset circuit. The driver circuit drives a plurality of light emitting diodes via a switch. The switch is controlled by a first signal having a first frequency. The driver circuit controls brightness of the light emitting diodes based on a second signal including a plurality of pulses. The modulator circuit modulates the first signal using a direct sequence spread spectrum modulation. The direct sequence spread spectrum modulation uses a sequence generated based on the first signal. The reset circuit resets the modulator circuit at each of the plurality of pulses of the second signal. The modulator circuit repeats the sequence at each of the plurality of pulses of the second signal.

"In other features, the plurality of pulses of the second signal has a second frequency. The modulator circuit eliminates visible flicker in the light emitting diodes due to harmonics having frequencies less than the second frequency by repeating the sequence at each of the plurality of pulses of the second signal.

"In another feature, the reset circuit synchronizes the first signal and the second signal by resetting the modulator circuit at each of the plurality of pulses of the second signal.

"In other features, the modulator circuit comprises a divider circuit, an L bit shift register, and a digital-to-analog converter. The divider circuit divides the first frequency by N and that generates a divided signal, where N is an integer greater than 1. The L bit shift register is clocked by the divided signal and that outputs M of the L bits at every clock cycle of the divided signal, where L an M are integers greater than 1, and where L is greater than M. The digital-to-analog converter converts the M bits into a waveform including 2.sup.M discrete steps that change at every clock cycle of the divided signal. The modulator circuit modulates the first signal based on the waveform.

"In other features, the sequence includes the M bits that change at every clock cycle of the divided signal. The sequence repeats every (2.sup.L-1)*N clock cycles of the divided signal.

"In another feature, the modulator circuit comprises a low-pass filter that filters the waveform generated by the digital-to-analog converter and that has a cutoff frequency equal to the first frequency divided by N.

"In another feature, the system further comprises a signal generator that generates the first signal and that controls the first frequency of the first signal based on the filtered waveform.

"In still other features, a method comprises driving a plurality of light emitting diodes via a switch and controlling the switch by a first signal having a first frequency. The method further comprises modulating the first signal using a direct sequence spread spectrum modulation. The direct sequence spread spectrum modulation uses a sequence generated based on the first signal. The method further comprises controlling brightness of the light emitting diodes based on a second signal including a plurality of pulses. The method further comprises repeating the sequence at each of the plurality of pulses of the second signal.

"In other features, the plurality of pulses of the second signal has a second frequency. The method further comprises eliminating visible flicker in the light emitting diodes due to harmonics having frequencies less than the second frequency by repeating the sequence at each of the plurality of pulses of the second signal.

"In other features, the method further comprises dividing the first frequency by N and generating a divided signal, where N is an integer greater than 1. The method further comprises shifting L bits at every clock cycle of the divided signal, where L is an integer greater than 1. The method further comprises outputting M of the L bits at every clock cycle of the divided signal, where M is an integer greater than 1, and where L is greater than M. The method further comprises converting the M bits into a waveform including 2.sup.M discrete steps that change at every clock cycle of the divided signal. The method further comprises modulating the first signal based on the waveform.

"In another feature, the method further comprises synchronizing the first signal and the second signal by resetting the dividing and the shifting at each of the plurality of pulses of the second signal.

"In other features, the sequence includes the M bits that change at every clock cycle of the divided signal. The method further comprises repeating the sequence every (2.sup.L-1)*N clock cycles of the divided signal.

"In another feature, the method further comprises filtering the waveform using a low-pass filter having a cutoff frequency equal to the first frequency divided by N.

"In another feature, the method further comprises controlling the first frequency of the first signal based on the filtered waveform.

"Further areas of applicability of the present disclosure will become apparent from the detailed description, the claims and the drawings. The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the disclosure."

For more information, see this patent: Mariano, Gianluca; Hariharan, Suresh. Eliminating Flicker in LED-Based Display Systems. U.S. Patent Number 9542880, filed May 29, 2014, and published online on January 10, 2017. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9542880.PN.&OS=PN/9542880RS=PN/9542880

Keywords for this news article include: Electronics, Digital To Analog, Light-emitting Diode, Maxim Integrated Products Inc.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2017, NewsRx LLC

(c) 2017 NewsRx LLC, source Technology Newsletters

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EBIT 2017 706 M
Net income 2017 539 M
Finance 2017 728 M
Yield 2017 3,18%
P/E ratio 2017 22,36
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EV / Sales 2018 4,56x
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