Patents by Inventor Hyong-Do CHOI
Hyong-Do CHOI 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: 11908882Abstract: A display device of the invention includes pixels each connected to at least one of scan lines and at least one of emission lines, a scan driver providing scan signals to the scan lines, and an emission driver including stages connected to the emission lines, each of the stages providing an emission signal to a corresponding emission line. A first stage among the stages includes a first transistor including a first electrode connected to a first power source line, a second electrode connected to a first emission line, and a gate electrode connected to a first scan line, and a second transistor including a first electrode connected to a first node and a second electrode connected to the first emission line.Type: GrantFiled: February 23, 2021Date of Patent: February 20, 2024Assignee: SAMSUNG DISPLAY CO., LTD.Inventor: Hyong Do Choi
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Patent number: 11391999Abstract: A display device includes a display panel, and a first flexible printed circuit board bonded to a side surface of the display panel. The display panel includes: a first substrate; a first extension wire on a top surface of the first substrate, the top surface being parallel to a first direction and a second direction, the second direction being perpendicular to the first direction; a first recess portion at a side surface of the first substrate; and a first pad that extends from the first extension wire in a third direction perpendicular to the first and second directions, the first pad being disposed in the recess portion, and the first extension wire and the first pad comprise the same material.Type: GrantFiled: February 28, 2020Date of Patent: July 19, 2022Inventors: Ha Sook Kim, Deok-Hwan Kim, Sung-Jun Kim, Yun-Tae Kim, Jeong Hyun Kim, Kenneth Lee, Hyong Do Choi
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Publication number: 20220013575Abstract: A display device of the invention includes pixels each connected to at least one of scan lines and at least one of emission lines, a scan driver providing scan signals to the scan lines, and an emission driver including stages connected to the emission lines, each of the stages providing an emission signal to a corresponding emission line. A first stage among the stages includes a first transistor including a first electrode connected to a first power source line, a second electrode connected to a first emission line, and a gate electrode connected to a first scan line, and a second transistor including a first electrode connected to a first node and a second electrode connected to the first emission line.Type: ApplicationFiled: February 23, 2021Publication date: January 13, 2022Inventor: Hyong Do CHOI
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Publication number: 20210072582Abstract: A display device includes a display panel, and a first flexible printed circuit board bonded to a side surface of the display panel. The display panel includes: a first substrate; a first extension wire on a top surface of the first substrate, the top surface being parallel to a first direction and a second direction, the second direction being perpendicular to the first direction; a first recess portion at a side surface of the first substrate; and a first pad that extends from the first extension wire in a third direction perpendicular to the first and second directions, the first pad being disposed in the recess portion, and the first extension wire and the first pad comprise the same material.Type: ApplicationFiled: February 28, 2020Publication date: March 11, 2021Inventors: Ha Sook KIM, Deok-Hwan KIM, Sung-Jun KIM, Yun-Tae KIM, Jeong Hyun KIM, KENNETH LEE, Hyong Do CHOI
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Patent number: 10460678Abstract: A display device includes a light emitting diode array including a plurality of light emitting diodes, a monitoring circuit configured to generate a monitoring signal corresponding to a forward voltage of a first light emitting diode of the plurality of light emitting diodes, a backlight controller configured to control the amount of current flowing to the light emitting diode array, and a first luminance compensation circuit configured to increase the amount of current flowing to the light emitting diode array in response to the monitoring signal.Type: GrantFiled: November 16, 2017Date of Patent: October 29, 2019Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Hyong Do Choi, Seung Gil Baek
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Patent number: 10121444Abstract: A display panel driving apparatus includes a grayscale voltage outputting part which generates a first positive polarity grayscale voltage and a first polarity negative grayscale voltage, compares the first positive polarity with a first reference voltage to output a first comparison voltage, compares the first negative polarity grayscale voltage with a second reference voltage to output a second comparison voltage, compares the first comparison voltage with the second comparison voltage to output a voltage deviation value, and outputs a second positive polarity grayscale voltage and a second negative polarity grayscale voltage based on the voltage deviation value, and a data driving part which outputs a data signal based on image data to a data line of a display panel, using the second positive polarity grayscale voltage and the second negative polarity grayscale voltage.Type: GrantFiled: March 28, 2016Date of Patent: November 6, 2018Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Hyong-Do Choi, Yun-Nam Kim
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Publication number: 20180144691Abstract: A display device includes a light emitting diode array including a plurality of light emitting diodes, a monitoring circuit configured to generate a monitoring signal corresponding to a forward voltage of a first light emitting diode of the plurality of light emitting diodes, a backlight controller configured to control the amount of current flowing to the light emitting diode array, and a first luminance compensation circuit configured to increase the amount of current flowing to the light emitting diode array in response to the monitoring signal.Type: ApplicationFiled: November 16, 2017Publication date: May 24, 2018Inventors: HYONG DO CHOI, SEUNG GIL BAEK
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Patent number: 9741298Abstract: A display apparatus includes a display panel which displays an image, a timing controller which determines an inversion driving method of the display panel based on a waveform of a fed back common voltage from the display panel, and a data driver which outputs a data voltage to the display panel according to the inversion driving method.Type: GrantFiled: June 9, 2015Date of Patent: August 22, 2017Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Kwang-Hyun Baek, Hyun-Seop Song, Hyong-Do Choi, Joo-Suk Lee
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Patent number: 9711100Abstract: A common voltage distortion detecting circuit includes a current sensor, a voltage difference voltage detecting circuit and a comparator. The current sensor is disposed between a circuit configured to apply a common voltage to a liquid crystal display panel and an input power terminal providing a power voltage. The voltage difference detecting circuit is configured to detect a difference voltage between two terminals of the current sensor. The comparator is configured to compare the difference voltage and a reference voltage to output an over current signal to convert an inversion method of the liquid crystal display panel when the difference voltage is greater than the reference voltage.Type: GrantFiled: January 30, 2015Date of Patent: July 18, 2017Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Hyong-Do Choi, Yun-Nam Kim
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Publication number: 20170084218Abstract: A display panel driving apparatus includes a grayscale voltage outputting part which generates a first positive polarity grayscale voltage and a first polarity negative grayscale voltage, compares the first positive polarity with a first reference voltage to output a first comparison voltage, compares the first negative polarity grayscale voltage with a second reference voltage to output a second comparison voltage, compares the first comparison voltage with the second comparison voltage to output a voltage deviation value, and outputs a second positive polarity grayscale voltage and a second negative polarity grayscale voltage based on the voltage deviation value, and a data driving part which outputs a data signal based on image data to a data line of a display panel, using the second positive polarity grayscale voltage and the second negative polarity grayscale voltage.Type: ApplicationFiled: March 28, 2016Publication date: March 23, 2017Inventors: Hyong-Do CHOI, Yun-Nam KIM
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Patent number: 9384706Abstract: A voltage generating circuit includes a voltage dividing part connected between a main voltage source and a ground configured to divide a main voltage into a plurality of driving voltages and output the plurality of driving voltages, a delay part connected between a driving voltage source and the ground, and configured to delay a driving voltage by a predetermined period and apply the driving voltage to an input terminal of a driver circuit, and a discharge part connected between the voltage dividing part and the delay part, and configured to discharge a voltage charged in the delay part to a ground when the driving voltage is blocked. The discharge part comprises an amplifier, an inverting input of the amplifier being connected to the driving voltage source and a non-inverting input of the amplifier being connected to an output terminal of the delay part.Type: GrantFiled: April 22, 2014Date of Patent: July 5, 2016Assignee: Samsung Display Co., Ltd.Inventors: Hyong-Do Choi, Yun-Nam Kim, Sang-Young Lee
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Publication number: 20160171943Abstract: A display apparatus includes a display panel which displays an image, a timing controller which determines an inversion driving method of the display panel based on a waveform of a fed back common voltage from the display panel, and a data driver which outputs a data voltage to the display panel according to the inversion driving method.Type: ApplicationFiled: June 9, 2015Publication date: June 16, 2016Inventors: Kwang-Hyun BAEK, Hyun-Seop SONG, Hyong-Do CHOI, Joo-Suk LEE
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Publication number: 20160043541Abstract: A common voltage distortion detecting circuit includes a current sensor, a voltage difference voltage detecting circuit and a comparator. The current sensor is disposed between a circuit configured to apply a common voltage to a liquid crystal display panel and an input power terminal providing a power voltage. The voltage difference detecting circuit is configured to detect a difference voltage between two terminals of the current sensor. The comparator is configured to compare the difference voltage and a reference voltage to output an over current signal to convert an inversion method of the liquid crystal display panel when the difference voltage is greater than the reference voltage.Type: ApplicationFiled: January 30, 2015Publication date: February 11, 2016Inventors: HYONG-DO CHOI, YUN-NAM KIM
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Publication number: 20150170596Abstract: A voltage generating circuit includes a voltage dividing part connected between a main voltage source and a ground configured to divide a main voltage into a plurality of driving voltages and output the plurality of driving voltages, a delay part connected between a driving voltage source and the ground, and configured to delay a driving voltage by a predetermined period and apply the driving voltage to an input terminal of a driver circuit, and a discharge part connected between the voltage dividing part and the delay part, and configured to discharge a voltage charged in the delay part to a ground when the driving voltage is blocked. The discharge part comprises an amplifier, an inverting input of the amplifier being connected to the driving voltage source and a non-inverting input of the amplifier being connected to an output terminal of the delay part.Type: ApplicationFiled: April 22, 2014Publication date: June 18, 2015Applicant: Samsung Display Co., LTD.Inventors: Hyong-Do CHOI, Yun-Nam KIM, Sang-Young LEE