Patents by Inventor Se-Byung Chae

Se-Byung Chae 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).

  • Publication number: 20200286448
    Abstract: A display device including a display unit including a scan line, a data line, and a pixel, a gate driver supplying a scan signal, and a source driver supplying a data voltage, in which the source driver includes a gamma voltage generator generating different gamma voltages in response to a gamma enable signal, a digital-to-analog converter generating the data voltage corresponding to a gray scale value using the gamma voltages, and a source buffer outputting the data voltage, the gamma voltage generator includes a first resistor string setting a range of the gamma voltages, gamma buffers outputting selected voltages among divided voltages within the voltage range, and a second resistor string including tabs to divide a voltage between the tabs to generate the gamma voltages, and at least some of the gamma buffers are turned on in a first period and are turned off in a second period.
    Type: Application
    Filed: March 1, 2020
    Publication date: September 10, 2020
    Inventors: Su Bin KIM, Se Byung CHAE
  • Publication number: 20200286417
    Abstract: A source driver includes a gamma voltage generator to generate gamma voltages having mutually different voltage levels, a digital-to-analog converter to generate a data voltage corresponding to a grayscale value using the gamma voltages, an output buffer unit to output the data voltage, and a chopping controller to generate a chopping control signal, and to provide the chopping control signal to the output buffer unit. The output buffer unit includes an amplifier connected to an output terminal of the digital-to-analog converter, and a chopping circuit to periodically change a polarity of an offset of the amplifier in response to the chopping control signal. The chopping controller is to change a slew rate of the chopping control signal.
    Type: Application
    Filed: March 6, 2020
    Publication date: September 10, 2020
    Inventors: Se Byung CHAE, Su Bin KIM
  • Patent number: 10769991
    Abstract: A display device includes: a display region including a first pixel region, a second pixel region, and a third pixel region; a dummy region including a first dummy region disposed between the second pixel region and the third pixel region; first, second, and third pixels respectively arranged in the first pixel region, the second pixel region, and the third pixel region in a matrix of vertical lines and horizontal lines; a data converter configured to: receive first image data including effective data corresponding to the display region and dummy data corresponding to the dummy region; and generate second image data by converting a gray scale value of dummy data corresponding to at least one region of the first dummy region in the first image data into a predetermined first gray scale value, the first gray scale value being between a lowest gray scale value and a highest gray scale value.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: September 8, 2020
    Assignee: Samsung Display Co., Ltd.
    Inventors: Ji Hyun Ka, Tae Hoon Kwon, Ki Myeong Eom, Chung Yi, Se Byung Chae, Deok Jun Choi, Moon Sang Hwang
  • Patent number: 10535301
    Abstract: A data driver includes an input unit configured to receive data from outside, a digital-analog converter configured to generate a data signal by using the data, a data comparator configured to compare a reference gray scale value with the data and to generate a first control signal or a second control signal corresponding to a comparison result, and an output unit configured to supply the data signal to data lines, wherein the output unit includes at least one buffer, and a slew rate of the at least one buffer is set to vary depending on whether the first control signal or the second control signal is generated.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: January 14, 2020
    Assignee: Samsung Display Co., Ltd.
    Inventors: Se Byung Chae, Weon Jun Choe, Jin Young Jeon
  • Publication number: 20190340974
    Abstract: A display device includes: a display region including a first pixel region, a second pixel region, and a third pixel region; a dummy region including a first dummy region disposed between the second pixel region and the third pixel region; first, second, and third pixels respectively arranged in the first pixel region, the second pixel region, and the third pixel region in a matrix of vertical lines and horizontal lines; a data converter configured to: receive first image data including effective data corresponding to the display region and dummy data corresponding to the dummy region; and generate second image data by converting a gray scale value of dummy data corresponding to at least one region of the first dummy region in the first image data into a predetermined first gray scale value, the first gray scale value being between a lowest gray scale value and a highest gray scale value.
    Type: Application
    Filed: November 1, 2018
    Publication date: November 7, 2019
    Inventors: Ji Hyun Ka, Tae Hoon Kwon, Ki Myeong Eom, Chung Yi, Se Byung Chae, Deok Jun Choi, Moon Sang Hwang
  • Patent number: 10403704
    Abstract: A display apparatus includes: a scan line extending in a first direction; a first data line and a second data line extending in a second direction crossing the first direction; a fixed voltage line extending in the second direction between the first and second data lines and configured to receive a fixed voltage; an auxiliary line between the fixed voltage line and one of the first and second data lines, wherein the fixed voltage is applied to the auxiliary line; a transistor circuit comprising a second transistor coupled to the scan line and the first data line and a first transistor coupled to the second transistor and the fixed voltage line; and a light emitting device coupled to the transistor circuit, wherein at least a portion of the transistor circuit is between the fixed voltage line and the auxiliary line.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: September 3, 2019
    Assignee: Samsung Display Co., Ltd.
    Inventor: Se Byung Chae
  • Publication number: 20180158408
    Abstract: A data driver includes an input unit configured to receive data from outside, a digital-analog converter configured to generate a data signal by using the data, a data comparator configured to compare a reference gray scale value with the data and to generate a first control signal or a second control signal corresponding to a comparison result, and an output unit configured to supply the data signal to data lines, wherein the output unit includes at least one buffer, and a slew rate of the at least one buffer is set to vary depending on whether the first control signal or the second control signal is generated.
    Type: Application
    Filed: December 7, 2017
    Publication date: June 7, 2018
    Inventors: Se Byung Chae, Weon Jun Choe, Jin Young Jeon
  • Patent number: 9812066
    Abstract: An organic light emitting display includes a plurality of pixel row groups, a scan driver, a data driver, and a data distributor. Each pixel group includes the same number of pixel rows, and the pixel row groups are sequentially driven. The data distributor demultiplexes data signals for input into the pixels. The data signals are input to the pixels after threshold voltage compensation is performed at substantially a same time for pixels in each of the pixel row groups. Data signals are to be input to pixels in one pixel row group while threshold voltage compensation is performed for pixels in another pixel row group adjacent to the one pixel row group.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: November 7, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Cheol Min Kim, Hyung ryul Kang, Se Byung Chae
  • Publication number: 20170221979
    Abstract: A display apparatus includes: a scan line extending in a first direction; a first data line and a second data line extending in a second direction crossing the first direction; a fixed voltage line extending in the second direction between the first and second data lines and configured to receive a fixed voltage; an auxiliary line between the fixed voltage line and one of the first and second data lines, wherein the fixed voltage is applied to the auxiliary line; a transistor circuit comprising a second transistor coupled to the scan line and the first data line and a first transistor coupled to the second transistor and the fixed voltage line; and a light emitting device coupled to the transistor circuit, wherein at least a portion of the transistor circuit is between the fixed voltage line and the auxiliary line.
    Type: Application
    Filed: January 26, 2017
    Publication date: August 3, 2017
    Inventor: Se Byung Chae
  • Patent number: 9704434
    Abstract: A display device includes a plurality of pixel rows including a plurality of pixel circuits; a scan driver supplying scan signals to the plurality of pixel rows; and a data driver supplying a data voltage to the plurality of pixel circuits of the plurality of pixel rows, wherein the plurality of pixel circuits each include driving transistors and an organic light emitting diode which emit light depending on a current flowing in the driving transistors, the plurality of pixel rows are divided into a plurality of blocks, each of the blocks including at least one pixel row, and a period for which the data voltage is written in the plurality of pixel circuits in a first block among the plurality of blocks and a period for which a threshold voltage of the driving transistors of the plurality of pixel circuits in a second block temporally close to the first block is compensated partially overlap each other.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: July 11, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Hyung-Ryul Kang, Cheol Min Kim, Se-Byung Chae
  • Patent number: 9508302
    Abstract: Exemplary embodiments of the present invention relate to a power supply of a display device that includes a driving circuit and a display panel that displays an image according to an output data voltage transmitted from the driving circuit. The power supply includes a first booster and a second booster provided in the driving circuit, the first booster generates a first output voltage supplied to an Op-amp of a source output circuit of the driving circuit, and the second booster generates a second output voltage supplied to buffers of the source output circuit of the driving circuit.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: November 29, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventor: Se-Byung Chae
  • Publication number: 20160217739
    Abstract: A display device includes a plurality of pixel rows including a plurality of pixel circuits; a scan driver supplying scan signals to the plurality of pixel rows; and a data driver supplying a data voltage to the plurality of pixel circuits of the plurality of pixel rows, wherein the plurality of pixel circuits each include driving transistors and an organic light emitting diode which emit light depending on a current flowing in the driving transistors, the plurality of pixel rows are divided into a plurality of blocks, each of the blocks including at least one pixel row, and a period for which the data voltage is written in the plurality of pixel circuits in a first block among the plurality of blocks and a period for which a threshold voltage of the driving transistors of the plurality of pixel circuits in a second block temporally close to the first block is compensated partially overlap each other.
    Type: Application
    Filed: July 17, 2015
    Publication date: July 28, 2016
    Inventors: Hyung-Ryul Kang, Cheol Min Kim, Se-Byung Chae
  • Patent number: 9378683
    Abstract: A display device is disclosed. In one aspect, the display device includes a display panel including a plurality of pixels, and a data driver including a plurality of data output unit buffers electrically connected to a plurality of data lines electrically connected to the pixels. Each of the data output unit buffers includes an output terminal, a first transistor for applying a high level data voltage to the output terminal, and a second transistor for applying a low level data voltage to the output terminal. Each of the data output unit buffers also includes a first switch electrically connecting the first and second transistors to the output terminal, and a second switch electrically connecting a ground voltage to the output terminal.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: June 28, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Se-Byung Chae, Wook Lee
  • Patent number: 9368060
    Abstract: A power system for an organic light emitting diode (OLED) display includes a power supplier and a power source controller. The power supplier respectively supplies a first power source voltage and a second power source voltage to first and second power source voltage application lines. The power source controller calculates a reference power source voltage corresponding to a maximum average grayscale using a distribution for each grayscale of first to third image data, models each voltage drop of the first and second power source voltages for first to third subpixels, and reflects the voltage drop to the reference power source voltage to change the second power source voltage.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: June 14, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Se-Byung Chae, Wook Lee, Jeong-Hwan Shin
  • Publication number: 20160155387
    Abstract: An organic light emitting display includes a plurality of pixel row groups, a scan driver, a data driver, and a data distributor. Each pixel group includes the same number of pixel rows, and the pixel row groups are sequentially driven. The data distributor demultiplexes data signals for input into the pixels. The data signals are input to the pixels after threshold voltage compensation is performed at substantially a same time for pixels in each of the pixel row groups. Data signals are to be input to pixels in one pixel row group while threshold voltage compensation is performed for pixels in another pixel row group adjacent to the one pixel row group.
    Type: Application
    Filed: April 7, 2015
    Publication date: June 2, 2016
    Inventors: Cheol Min KIM, Hyung ryul KANG, Se Byung CHAE
  • Patent number: 9311850
    Abstract: A pixel capable of minimizing power consumption is disclosed. In one embodiment, the pixel includes an organic light emitting diode (OLED), a first transistor for controlling an amount of current supplied from a first power supply to the OLED to correspond to a voltage applied to a first node, and a second transistor and a third transistor coupled between a second node electrically coupled to a data line and the first node in parallel in a period where a scan signal is supplied.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: April 12, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Wook Lee, Jeong-Hwan Shin, Se-Byung Chae
  • Patent number: 9241387
    Abstract: There is provided an organic light emitting display device capable of reducing power consumption by adjusting a voltage according to an input image and deterioration of the organic light emitting display device and a method of driving the same.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: January 19, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jeong-Hwan Shin, Wook Lee, Se-Byung Chae
  • Publication number: 20150022429
    Abstract: A display device is disclosed. In one aspect, the display device includes a display panel including a plurality of pixels, and a data driver including a plurality of data output unit buffers electrically connected to a plurality of data lines electrically connected to the pixels. Each of the data output unit buffers includes an output terminal, a first transistor for applying a high level data voltage to the output terminal, and a second transistor for applying a low level data voltage to the output terminal. Each of the data output unit buffers also includes a first switch electrically connecting the first and second transistors to the output terminal, and a second switch electrically connecting a ground voltage to the output terminal.
    Type: Application
    Filed: March 21, 2014
    Publication date: January 22, 2015
    Applicant: Samsung Display Co., Ltd.
    Inventors: Se-Byung Chae, Wook Lee
  • Publication number: 20140347343
    Abstract: Exemplary embodiments of the present invention relate to a power supply of a display device that includes a driving circuit and a display panel that displays an image according to an output data voltage transmitted from the driving circuit. The power supply includes a first booster and a second booster provided in the driving circuit, the first booster generates a first output voltage supplied to an Op-amp of a source output circuit of the driving circuit, and the second booster generates a second output voltage supplied to buffers of the source output circuit of the driving circuit.
    Type: Application
    Filed: December 24, 2013
    Publication date: November 27, 2014
    Applicant: Samsung Display Co., Ltd.
    Inventor: Se-Byung CHAE
  • Publication number: 20140240305
    Abstract: A power system for an organic light emitting diode (OLED) display includes a power supplier and a power source controller. The power supplier respectively supplies a first power source voltage and a second power source voltage to first and second power source voltage application lines. The power source controller calculates a reference power source voltage corresponding to a maximum average grayscale using a distribution for each grayscale of first to third image data, models each voltage drop of the first and second power source voltages for first to third subpixels, and reflects the voltage drop to the reference power source voltage to change the second power source voltage.
    Type: Application
    Filed: September 30, 2013
    Publication date: August 28, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Se-Byung CHAE, Wook LEE, Jeong-Hwan SHIN