Patents by Inventor Joon-Chul Goh
Joon-Chul Goh 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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Publication number: 20240135880Abstract: The display device includes a display panel and a pixel. A compensator configured to calculate a degradation rate of the pixel based on an input gray level of first image data, and compensates the first image data based on the degradation rate to generate second image data. A data driver configured to generate a data signal based on the second image data and configured to supply the data signal to the pixel. The pixel includes a first element group and a second element group connected in series to each other, the first element group includes at least one first light emitting element, and the second element group includes at least one second light emitting element. The compensator is to calculate the degradation rate by applying first information on the number of the first light emitting elements and second information on the number of the second light emitting elements.Type: ApplicationFiled: October 22, 2023Publication date: April 25, 2024Inventors: Seok Ha HONG, Joon Chul GOH, Dong Joon KWAG, Hyung Jin KIM, Jae Sung BAE
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Publication number: 20240127728Abstract: A display device includes: a display panel including a normal pixel in a display region and a test pixel in a peripheral region, a sensing line coupled to the test pixel, and a sensing circuit configured to sense a mobility characteristic of the test pixel by measuring a current at a source node of the test pixel through the sensing line. The source node of the test pixel is electrically separated from the sensing line in a data writing period of a frame period, and is electrically coupled to the sensing line in an emission period of the frame period.Type: ApplicationFiled: August 4, 2023Publication date: April 18, 2024Inventors: SEONGJOO LEE, JOON-CHUL GOH, OHJO KWON
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Patent number: 11955081Abstract: A pixel includes: a storage capacitor connected between a first power supply voltage and a gate node; a first transistor including a gate electrode connected to the gate node; a second transistor to transfer a data signal to a source of the first transistor in response to a scan signal; a third transistor to diode-connect the first transistor in response to the scan signal, and including first and second sub-transistors serially connected between the gate node and a drain of the first transistor; a fourth transistor to transfer an initialization voltage to the gate node in response to an initialization signal, and including third and fourth sub-transistors serially connected between the gate node and the initialization voltage; and an organic light emitting diode including a cathode connected to a second power supply voltage. At least one of the second and fourth sub-transistors includes a bottom electrode.Type: GrantFiled: August 8, 2020Date of Patent: April 9, 2024Assignee: Samsung Display Co., Ltd.Inventors: Hyo Jin Lee, Joon-Chul Goh, Sangan Kwon, Hong Soo Kim, Hui Nam, Jin Young Roh, Sehyuk Park
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Patent number: 11915659Abstract: A display device includes a display panel including a pixel, a driving controller that receives an image signal and outputs an image data signal in which the image signal is compensated, and a data driving circuit that provides the pixel with a data signal corresponding to the image data signal. The driving controller includes a memory, a hysteresis calculator that calculates a current hysteresis state value of a current frame based on the image signal and a previous hysteresis state value of a previous frame, which is stored in the memory, and stores the current hysteresis state value in the memory, and a compensator that calculates a compensation value based on the image signal and the previous hysteresis state value stored in the memory and compensates for the image signal depending on the compensation value to output the image data signal.Type: GrantFiled: July 22, 2022Date of Patent: February 27, 2024Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Kanghee Lee, Joon-Chul Goh, Weonjun Choe
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Patent number: 11915658Abstract: A scan driving circuit includes: a driving circuit configured to output a scan signal to an output terminal in response to clock signals and a carry signal; and a masking circuit configured to stop the driving circuit from outputting the scan signal in response to a masking signal and a signal indicating an operating state of the driving circuit.Type: GrantFiled: March 6, 2023Date of Patent: February 27, 2024Assignee: Samsung Display Co., Ltd.Inventors: Taehoon Kim, Joon-Chul Goh, Soon-Dong Kim, Hae-Kwan Seo
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Publication number: 20240054948Abstract: A display device includes: a display panel including pixels having light-emitting elements; a timing control unit for variably changing the driving frame frequency of the display panel according to the input frame frequency of digital video data; and a data driving unit for outputting data voltages according to the digital video data, wherein the display panel operates at a first frame frequency for a first frame period and operates at a second frame frequency, which is lower than the first frame frequency, for a second frame period, the second frame period includes a data addressing period in which a data voltage corresponding to each of the pixels is applied to the pixels, and a blank period in which no data voltage is applied to each of the pixels, and the blank period includes a period of initializing a first electrode of a light-emitting element into an initialization voltage.Type: ApplicationFiled: August 23, 2021Publication date: February 15, 2024Inventors: Ji Hye KIM, Joon Chul GOH, Yu Chol KIM, Jin Wook YANG, Ja Kyoung JIN
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Patent number: 11900888Abstract: An electronic device is disclosed that includes a display panel, a data driving circuit, a scan driving circuit, and a driving controller. The driving controller generates image data based on a received image signal. The driving controller includes a minimum emission gray level determining unit that determines a gray level of the image signal, a pattern determining unit that determines a dither pattern of the image signal, a driving frequency sensing unit that determines a driving frequency of the image signal, and a data compensation unit that compensates for the image data based on the gray level and at least one of the dither pattern and the driving frequency.Type: GrantFiled: September 22, 2022Date of Patent: February 13, 2024Assignee: Samsung Display Co., Ltd.Inventors: Taehyeong An, Jinpil Kim, Joon-Chul Goh, Dongjoon Kwag, Jaesung Bae
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Patent number: 11887538Abstract: A light emission driving circuit includes a driving circuit configured to output a light emission driving signal to a first output terminal and output a switching signal to a first node in response to clock signals and a first carry signal, and a first masking circuit configured to output a second carry signal to a second output terminal in response to a masking clock signal, the light emission driving signal, and the first switching signal. The masking clock signal is a signal which is maintained at a first level during a normal mode and periodically changes during a low power mode.Type: GrantFiled: October 7, 2022Date of Patent: January 30, 2024Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Seongheon Cho, Joon-Chul Goh, Soon-Dong Kim, Bonghyun You
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Patent number: 11887531Abstract: A display device includes: a display panel, which displays an image; a panel driver, which drives the display panel; and a driving controller, which controls a drive of the panel driver. The driving controller includes a compensation determination block and a data compensation block. The compensation determination block is activated after a still image is displayed for a predetermined time or more and generates a compensation value based on a final afterimage component calculated using an afterimage algorithm obtained by a combination of a first afterimage calculation equation and a second afterimage calculation equation. The data compensation block receives an image signal with respect to a target image and reflects the compensation value to the image signal to generate a compensation image signal.Type: GrantFiled: September 13, 2022Date of Patent: January 30, 2024Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Jinpil Kim, Kanghee Lee, Joon-Chul Goh
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Patent number: 11875729Abstract: A display device includes a display panel including a panel region. The panel region includes a block, and the block includes a pixel. The display device further includes a temperature sensor sensing a region temperature of the panel region and a temperature estimator estimating a temperature of the display panel. The temperature estimator includes a stress calculator calculating an accumulated stress value corresponding to the block based on input image data, a temperature potential calculator calculating a temperature potential corresponding to the block based on the accumulated stress value and a resistance model related to a heat diffusion within the display panel, and a temperature calculator calculating a block temperature based on the region temperature and the temperature potential. The temperature of the display panel is estimated based on the block temperature.Type: GrantFiled: July 19, 2022Date of Patent: January 16, 2024Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Seokha Hong, Joon-Chul Goh, Jaesung Bae
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Patent number: 11869437Abstract: A display device including pixels connected to a data line and a sensing line; a data driver supplying one of an image data signal and a sensing data signal to the data line; a sensing unit supplying an initialization voltage to at least one of the pixels through the sensing line and obtaining a sensing current value from at least one of the pixels through the sensing line; and a compensator generating compensation image data according to a sensing pixel current value among the sensing current value using an artificial neural network model learned to output reference image data corresponding to at least one reference sensing current value among the sensing current value.Type: GrantFiled: June 30, 2022Date of Patent: January 9, 2024Assignee: Samsung Display Co., Ltd.Inventors: Sang Ik Lee, Joon Chul Goh, Min Seok Bae
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Patent number: 11847947Abstract: A flexible display device includes: a flexible display panel including a plurality of pixels, a power supply line coupled to the plurality of pixels, and at least one measuring line; a power management circuit, which supplies a power supply voltage to the plurality of pixels through the power supply line; and a display driver, which drives the flexible display panel. The display driver senses a resistance of the at least one measuring line, and detects at least one of a deformation position and a deformation amount of the flexible display panel based on the sensed resistance.Type: GrantFiled: August 23, 2022Date of Patent: December 19, 2023Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Yunki Baek, Joon-Chul Goh
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Patent number: 11842675Abstract: A display device includes a display panel including a plurality of pixels respectively connected to a plurality of data lines and a plurality of scan lines, a data driving circuit for driving the plurality of data lines, a scan driving circuit for driving the plurality of scan lines, and a driving controller for receiving a control signal and an image signal and controlling the data driving circuit and the scan driving circuit such that an image is displayed on the display panel. The driving controller identifies a first region and a second region of an image to be displayed on the display panel based on the image signal and provides the data driving circuit with an image data signal obtained by compensating for the image signal to be provided to pixels adjacent to the second region among pixels corresponding to the first region as a compensation value.Type: GrantFiled: April 27, 2022Date of Patent: December 12, 2023Assignee: Samsung Display Co., Ltd.Inventors: Dong Won Lee, Byung Ki Chun, Joon-Chul Goh, Bonghyun You
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Patent number: 11798464Abstract: A display device includes a degradation compensator, a controller, a data driver, and a display panel. The degradation compensator generates a first fitting function and a second fitting function based on image data, generates a compensation function through a harmonic mean of the first and second fitting functions, and generates a compensation value based on the compensation function. The controller receives the compensation value, and generates input image data to which the compensation value is applied. The data driver receives the input image data to which the compensation value is applied, and converts the input image data into a data voltage. The display panel includes pixels, in which each of the pixels includes a pixel circuit which receives the data voltage and a light-emitting element electrically connected to the pixel circuit.Type: GrantFiled: August 31, 2022Date of Patent: October 24, 2023Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Young-Soo Hwang, Joon-Chul Goh, Dongjoon Kwag, Hyungjin Kim, Ji-Eun Park, Jaesung Bae, Seokha Hong
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Patent number: 11727887Abstract: Provided is an electronic device according to an embodiment of the inventive concept may include a display panel including a plurality of pixels respectively connected to a plurality of data lines and a plurality of scan lines, a data driving circuit connected to the plurality of data lines, a scan driving circuit connected to the plurality of scan lines, and a driving controller generating image data, and controlling the data driving circuit and the scan driving circuit to display a plurality of frames at a first frequency on the display panel based on the image data, wherein at least one of the plurality of frames includes an effective interval during which an image is transmitted, a blanking interval during which the image is not transmitted, and a refresh interval operating at a second frequency different from the first frequency.Type: GrantFiled: April 18, 2022Date of Patent: August 15, 2023Assignee: Samsung Display Co., Ltd.Inventors: Yunki Baek, Taehyeong An, Joon-Chul Goh
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Patent number: 11710449Abstract: A display device includes an afterimage compensator generating output grayscales by applying at least one of first and second weights to input grayscales when the input grayscales correspond to a still image, and pixels displaying an image based on the output grayscales. The afterimage compensator applies the first weight having an initial value greater than 1 to the input grayscales of a first group, and converges the first weight to 1, and applies the second weight having initial values less than 1 to the input grayscales of a second group, and converges the second weights to 1.Type: GrantFiled: June 2, 2022Date of Patent: July 25, 2023Assignee: Samsung Display Co., Ltd.Inventors: Jin Pil Kim, Kang Hee Lee, Joon Chul Goh, Jae Sung Bae
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Patent number: 11705046Abstract: A data driver includes a multi-channel sample/hold circuit electrically connected between a digital-to-analog converter and a data buffer. The multi-channel sample/hold circuit includes a first sample/hold circuit connected to a first channel and a second sample/hold circuit connected to a second channel. The first sample/hold circuit performs a first drive operation and a second drive operation. The first drive operation includes sampling a data voltage as a buffer input voltage and maintaining the buffer input voltage during an nth horizontal time. The second drive operation includes outputting the buffer input voltage to an output terminal of the buffer during an (n+1)th horizontal time. The second sample/hold circuit performs the second drive operation during the nth horizontal time and performs the first drive operation during the (n+1)th horizontal time.Type: GrantFiled: September 10, 2021Date of Patent: July 18, 2023Assignees: SAMSUNG DISPLAY CO., LTD., KOREA UNIVERSITY RESEARCH & BUSINESS FOUNDATIONInventors: Young Soo Hwang, Joon Chul Goh, Oh Jo Kwon, Ki Duk Kim, Jeong Min Kim, Bong Hyun You, Hyung Min Lee, Seung Hun Choi
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Publication number: 20230222982Abstract: An electronic device is disclosed that includes a display panel, a data driving circuit, a scan driving circuit, and a driving controller. The driving controller generates image data based on a received image signal. The driving controller includes a minimum emission gray level determining unit that determines a gray level of the image signal, a pattern determining unit that determines a dither pattern of the image signal, a driving frequency sensing unit that determines a driving frequency of the image signal, and a data compensation unit that compensates for the image data based on the gray level and at least one of the dither pattern and the driving frequency.Type: ApplicationFiled: September 22, 2022Publication date: July 13, 2023Inventors: TAEHYEONG AN, JINPIL KIM, JOON-CHUL GOH, DONGJOON KWAG, JAESUNG BAE
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Patent number: 11699395Abstract: A display device according to some embodiments includes pixels divided into pixel rows arranged in a horizontal direction, and including a light emitting element, and a first transistor for applying a drive current to the light emitting element, and a sensing driver configured to receive a sensing value extracted from one or more of the pixels, wherein at least one pixel row of the pixel rows is configured to be driven in one frame including an emission period in which the light emitting element emits light after a data voltage is applied to the pixels, and an active sensing period for sensing a characteristic of the first transistor.Type: GrantFiled: June 23, 2021Date of Patent: July 11, 2023Assignee: Samsung Display Co., Ltd.Inventors: Yun Ki Baek, Joon Chul Goh, Jung Taek Kim
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Publication number: 20230206856Abstract: A scan driving circuit includes: a driving circuit configured to output a scan signal to an output terminal in response to clock signals and a carry signal; and a masking circuit configured to stop the driving circuit from outputting the scan signal in response to a masking signal and a signal indicating an operating state of the driving circuit.Type: ApplicationFiled: March 6, 2023Publication date: June 29, 2023Inventors: TAEHOON KIM, JOON-CHUL GOH, SOON-DONG KIM, HAE-KWAN SEO