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Patent Issued for Power Converter, Display Device Including Power Converter, System Including Display Device, and Method of Driving Display Device

September 10, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- A patent by the inventor Park, Sung-Cheon (Yongin-si, KR), filed on July 21, 2011, was published online on August 26, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8817429 is assigned to Samsung Display Co., Ltd. (Yongin, Gyeonggi-do, KR).

The following quote was obtained by the news editors from the background information supplied by the inventors: "Embodiments relate to a power converter, a display device including a power converter, a system including a display device, and a method of driving display device.

"Generally, a display device includes a display panel having a plurality of pixels arranged in a matrix form. Each of the plurality of pixels operates in response to a driving voltage.

"For example, each of the plurality of pixels included in an organic light emitting display may have an organic light emitting diode (OLED). The OLED generates light by coupling holes, which are provided from an anode to which a positive driving voltage (ELVDD) is applied, and electrons, which are provided from a cathode to which a negative driving voltage (ELVSS) is applied, in an organic material layer formed between the anode and the cathode."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "An embodiment is directed to a power converter, including a voltage conversion unit that provides a first driving voltage at a first output electrode by converting a power supply voltage in response to a first control signal, the voltage conversion unit being configured to provide a second driving voltage at a second output electrode by converting the power supply voltage after a short detection period, the voltage conversion unit being configured to shut down in response to a third control signal, and a short detection unit that generates the third control signal by comparing a magnitude of a voltage of the second output electrode with a magnitude of a reference voltage during the short detection period.

"The voltage conversion unit may include a control unit that enables a first driving signal and that enables a second control signal during the short detection period when the first control signal is enabled, the control unit being configured to enable a second driving signal and to disable the second control signal after the short detection period, the control unit being configured to provide the second control signal to the short detection unit, the control unit being configured to disable the first driving signal and the second driving signal when the third control signal is enabled, a first voltage converter that generates the first driving voltage by converting the power supply voltage while the first driving signal is enabled, and a second voltage converter that generates the second driving voltage by converting the power supply voltage while the second driving signal is enabled.

"The control unit may include a timing generator that controls a length of the short detection period.

"The voltage conversion unit may further include a comparator that provides an enabled fourth control signal to the timing generator when a magnitude of the first driving voltage is equal to or larger than a magnitude of a target voltage, and the timing generator may control the length of the short detection period based on a length of a time period from a time when the first control signal is enabled to a time when the fourth control signal is enabled.

"The short detection unit may sense the magnitude of the voltage of the second output electrode at a time during the short detection period and compare the sensed magnitude of the voltage of the second output electrode with the magnitude of the reference voltage to generate the third control signal.

"The short detection unit may include a comparator that enables the third control signal when the magnitude of the voltage of the second output electrode is equal to or larger than the magnitude of the reference voltage and that disables the third control signal when the magnitude of the voltage of the second output electrode is smaller than the magnitude of the reference voltage, and a first switch connected between the power supply voltage and the comparator and configured to selectively provide the power supply voltage to the comparator in response to a second control signal, the second control signal being configured to be enabled during the short detection period and configured to be disabled after the short detection period.

"The first switch may be turned on to provide the power supply voltage to the comparator when the second control signal is enabled, and may be turned off to stop providing the power supply voltage to the comparator when the second control signal is disabled.

"The short detection unit may further includes a pull-down unit connected between the second output electrode and a ground voltage, the pull-down unit being configured to be turned on in response to the second control signal.

"The pull-down unit may include a pull-down register, a first terminal of the pull-down register being connected to the second output electrode, and a second switch connected between a second terminal of the pull-down register and the ground voltage, the second switch being configured to be turned on when the second control signal is enabled, and to be turned off when the second control signal is disabled.

"The second switch may include an NMOS transistor, the NMOS transistor having a drain connected to the second terminal of the pull-down register, a source connected to the ground voltage, and a gate receiving the second control signal.

"The short detection unit may further include an inverter that generates an inverted control signal by inverting the second control signal, and a second switch connected between an output electrode of the comparator and the ground voltage, the second switch being configured to be turned on in response to the inverted control signal.

"The second switch may be turned off to separate the output electrode of the comparator from the ground voltage when the inverted control signal is disabled, and may be turned on to disable the third control signal when the inverted control signal is enabled.

"The short detection unit may further include a reference voltage generator that generates the reference voltage.

"The first driving voltage may have a positive potential and the second driving voltage may have a negative potential.

"The first driving voltage may have a negative potential and the second driving voltage may have a positive potential.

"Another embodiment is directed to a display device, including a display panel including a plurality of pixels, the plurality of pixels being configured to operate in response to a first driving voltage, a second driving voltage, and a data signal, a power converter that provides the first driving voltage at a first output electrode of the power converter and that provides the second driving voltage at a second output electrode of the power converter at a time interval of a short detection period in response to a first control signal, the power converter being configured to shut down when a magnitude of a voltage of the second output electrode is equal to or larger than a magnitude of a reference voltage during the short detection period, and a driving unit that provides the data signal to the display panel and that provides the first control signal to the power converter.

"The first driving voltage may have a positive potential and the second driving voltage may have a negative potential.

"The first driving voltage may have a negative potential and the second driving voltage may have a positive potential.

"The short detection period may correspond to N frame cycles, where N is a positive integer.

"The power converter may connect the second output electrode to a ground voltage through a pull-down register during the short detection period.

"The driving unit may provide a data signal corresponding to black color to the display panel during the short detection period.

"The driving unit may provide the data signal corresponding to black color to the display panel for at least one frame cycle from the end of the short detection period.

"The power converter may include a voltage conversion unit that provides the first driving voltage at the first output electrode by converting a power supply voltage in response to the first control signal, the voltage conversion unit being configured to provide the second driving voltage at the second output electrode by converting the power supply voltage after the short detection period, the voltage conversion unit being configured to shut down in response to a third control signal, and a short detection unit that generates the third control signal by comparing a magnitude of a voltage of the second output electrode with a magnitude of the reference voltage during the short detection period.

"Each of the plurality of pixels may include an organic light emitting diode.

"Another embodiment is directed to a method of driving a display device, the method including providing a first driving voltage from a first output electrode of a power converter to a display panel, comparing a magnitude of a voltage of a second output electrode of the power converter with a magnitude of a reference voltage during a short detection period, providing a second driving voltage from the second output electrode of the power converter to the display panel after the short detection period when the magnitude of the voltage of the second output electrode is kept smaller than the magnitude of the reference voltage during the short detection period, and shutting down the power converter when the magnitude of the voltage of the second output electrode is equal to or larger than the magnitude of the reference voltage during the short detection period.

"The first driving voltage may have a positive potential and the second driving voltage may have a negative potential.

"The first driving voltage may have a negative potential and the second driving voltage may have a positive potential.

"The method may further include connecting the second output electrode of the power converter to a ground voltage through a pull-down register during the short detection period.

"The method may further include providing a data signal corresponding to black color to the display panel before providing the first driving voltage to the display panel.

"Providing the data signal may include providing the data signal corresponding to black color to the display panel during the short detection period and for at least one frame cycle from the end of the short detection period.

"The display panel may include an organic light emitting diode.

"Another embodiment is directed to a system, including a storage device that stores image data, a display device that displays the image data, and a processor that controls the storage device and the display device. The display device may include a display panel including a plurality of pixels, the plurality of pixels being configured to operate in response to a first driving voltage, a second driving voltage, and a data signal, a power converter that provides the first driving voltage at a first output electrode of the power converter and that provides the second driving voltage at a second output electrode of the power converter at a time interval of a short detection period in response to a first control signal, the power converter being configured to shut down when a magnitude of a voltage of the second output electrode is equal to or larger than a magnitude of a reference voltage during the short detection period, and a driving unit that provides the data signal to the display panel and that provides the first control signal to the power converter."

URL and more information on this patent, see: Park, Sung-Cheon. Power Converter, Display Device Including Power Converter, System Including Display Device, and Method of Driving Display Device. U.S. Patent Number 8817429, filed July 21, 2011, and published online on August 26, 2014. 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=8817429.PN.&OS=PN/8817429RS=PN/8817429

Keywords for this news article include: Electronics, Light-emitting Diode, Samsung Display Co., Samsung Display Co. Ltd.

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Source: Electronics Newsweekly


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