Patents by Inventor Oh Jo Kwon
Oh Jo Kwon 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: 20210335277Abstract: A data driver includes a gamma voltage generator configured to generate gamma voltages based on a number of data bits of a pixel data; a first digital-to-analog block configured to generate a plurality of time-division gamma voltage signals respectively corresponding to a plurality of gamma voltage groups; a plurality of time-division gamma voltage line groups for transferring the plurality of time-division gamma voltage signals; a second digital-to-analog block configured to select a time-division gamma voltage signal among the time-division gamma voltage signals according to upper bits of the pixel data in each channel; a time-division gamma voltage select block configured to select a gamma voltage according to lower bits of the pixel data in each channel; and an output buffer block configured to output the selected gamma voltage in each channel.Type: ApplicationFiled: April 15, 2021Publication date: October 28, 2021Inventors: Young-Soo HWANG, Joon-Chul GOH, Oh Jo KWON, Ki-Duk KIM, Jeongmin KIM, Bong Hyun YOU, Hyung-Min LEE, Seung Hun CHOI
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Patent number: 11158248Abstract: A display device includes: a display panel including a plurality of pixels; a scan driver connected to the plurality of pixels through a plurality of scan lines; a data driver connected to the plurality of pixels through a plurality of data lines; an emission driver connected to the plurality of pixels through a plurality of emission control lines; a sensing circuit connected to the plurality of pixels through a plurality of sensing lines; and a controller configured to control the scan driver, the data driver, the emission driver and the sensing circuit, wherein, in an active period of each frame period, the scan driver sequentially applies a sensing pulse and a scan pulse to at least one scan line of the plurality of scan lines, and applies the scan pulse to remaining scan lines of the plurality of scan lines.Type: GrantFiled: August 12, 2019Date of Patent: October 26, 2021Assignee: Samsung Display Co., Ltd.Inventors: Hyungryul Kang, Oh Jo Kwon, Yoshimura Hideo, Bong-Hyun You, Jaekeun Lim
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Patent number: 11030950Abstract: An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor.Type: GrantFiled: September 27, 2019Date of Patent: June 8, 2021Assignee: Samsung Display Co., Ltd.Inventors: Oh Jo Kwon, Joo Hyung Lee, Kyung Youl Min
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Patent number: 10964270Abstract: A method of driving a pixel including: during a first period of a first frame, applying a first scan signal having a turn-on level to the first scan line, applying a data voltage to a data line, and applying a second scan signal having the turn-on level to the second scan line; and during a second period of a second frame, applying the first scan signal having the turn-on level to the first scan line, applying a bias voltage to the data line, and applying the second scan signal having a turn-off level to the second scan line, the second frame is a frame subsequent to the first frame, the second period is longer than the first period, and a light-emitting diode emits light at luminance based on the data voltage during at least a portion of the first frame and at least a portion of the second frame.Type: GrantFiled: March 12, 2020Date of Patent: March 30, 2021Assignee: Samsung Display Co., Ltd.Inventors: Ji Woong Kim, Oh Jo Kwon, Hyo Jin Lee, Se Hyuk Park
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Patent number: 10902780Abstract: A display device includes data lines, scan lines, and pixels. Each of the pixels includes an organic light emitting diode, a first transistor (OLED), and a second transistor. The first transistor is electrically connected to an anode of the OLED. The second transistor is electrically connected to the first transistor, a scan line among the scan lines, and a data line among the data lines. The second transistors of the pixels may receive instances of a reference voltage from the data lines during a first period of a frame. The second transistors of the pixels may simultaneously receive instances of a turn-on scan signal from the scan lines during the first period of the frame. Cathodes of the OLEDs of the pixels may receive instances of a turn-off voltage for the OLEDs to turn off during the first period of the frame.Type: GrantFiled: May 2, 2019Date of Patent: January 26, 2021Inventors: Jeon Kyoo Kim, Oh Jo Kwon, Jiwoong Kim, JunYong Song, Dong Won Lee, Jae Keun Lim
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Patent number: 10783827Abstract: A display device includes pixels connected to data lines and scan lines, a first compensator which is connected to sensing lines and senses deviation information of the sensing lines while supplying different voltages to adjacent sensing lines, and a sensing unit which is connected to the first compensator and senses characteristic information of each of the pixels.Type: GrantFiled: September 8, 2017Date of Patent: September 22, 2020Assignee: SAMSUNG DISPLAY CO., LTD.Inventors: Jeong Hwan Shin, Sung Hoon Bang, Sang Jae Yeo, Oh Jo Kwon
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Publication number: 20200294451Abstract: A method of driving a pixel including: during a first period of a first frame, applying a first scan signal having a turn-on level to the first scan line, applying a data voltage to a data line, and applying a second scan signal having the turn-on level to the second scan line; and during a second period of a second frame, applying the first scan signal having the turn-on level to the first scan line, applying a bias voltage to the data line, and applying the second scan signal having a turn-off level to the second scan line, the second frame is a frame subsequent to the first frame, the second period is longer than the first period, and a light-emitting diode emits light at luminance based on the data voltage during at least a portion of the first frame and at least a portion of the second frame.Type: ApplicationFiled: March 12, 2020Publication date: September 17, 2020Inventors: Ji Woong Kim, Oh Jo Kwon, Hyo Jin Lee, Se Hyuk Park
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Publication number: 20200090590Abstract: A display device includes data lines, scan lines, and pixels. Each of the pixels includes an organic light emitting diode, a first transistor (OLED), and a second transistor. The first transistor is electrically connected to an anode of the OLED. The second transistor is electrically connected to the first transistor, a scan line among the scan lines, and a data line among the data lines. The second transistors of the pixels may receive instances of a reference voltage from the data lines during a first period of a frame. The second transistors of the pixels may simultaneously receive instances of a turn-on scan signal from the scan lines during the first period of the frame. Cathodes of the OLEDs of the pixels may receive instances of a turn-off voltage for the OLEDs to turn off during the first period of the frame.Type: ApplicationFiled: May 2, 2019Publication date: March 19, 2020Inventors: Jeon Kyoo KIM, Oh Jo KWON, Jiwoong KIM, JunYong SONG, Dong Won LEE, Jae Keun LIM
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Publication number: 20200051496Abstract: A display device includes: a display panel including a plurality of pixels; a scan driver connected to the plurality of pixels through a plurality of scan lines; a data driver connected to the plurality of pixels through a plurality of data lines; an emission driver connected to the plurality of pixels through a plurality of emission control lines; a sensing circuit connected to the plurality of pixels through a plurality of sensing lines; and a controller configured to control the scan driver, the data driver, the emission driver and the sensing circuit, wherein, in an active period of each frame period, the scan driver sequentially applies a sensing pulse and a scan pulse to at least one scan line of the plurality of scan lines, and applies the scan pulse to remaining scan lines of the plurality of scan lines.Type: ApplicationFiled: August 12, 2019Publication date: February 13, 2020Inventors: Hyungryul KANG, Oh Jo KWON, Yoshimura HIDEO, Bong-Hyun YOU, Jaekeun LIM
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Publication number: 20200027398Abstract: An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor.Type: ApplicationFiled: September 27, 2019Publication date: January 23, 2020Inventors: Oh Jo Kwon, Joo Hyung Lee, Kyung Youl Min
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Patent number: 10438533Abstract: An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor.Type: GrantFiled: August 20, 2018Date of Patent: October 8, 2019Assignee: Samsung Display Co., Ltd.Inventors: Oh Jo Kwon, Joo Hyung Lee, Kyung Youl Min
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Patent number: 10186207Abstract: A display device includes pixels at respective crossing regions of scan lines and data lines, a scan driver that is configured to supply a scan signal to the scan lines, and a data driver that is configured to supply a pre-emphasis voltage to the data lines using a first constant for controlling a voltage value of the pre-emphasis voltage, and using a second constant for controlling a supply time of the pre-emphasis voltage, and supply data signals to the data lines after the supply of the pre-emphasis voltage, wherein at least one of the first or second constants is stored in each channel corresponding to each of the data lines.Type: GrantFiled: March 11, 2016Date of Patent: January 22, 2019Assignees: Samsung Display Co., Ltd., Korea Advanced Institute of Science and TechnologyInventors: Oh Jo Kwon, Ji Woong Kim, Choong Sun Shin, Joo Hyung Lee, Jun Suk Bang, Gyu Hyeong Cho
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Publication number: 20180357958Abstract: An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor.Type: ApplicationFiled: August 20, 2018Publication date: December 13, 2018Inventors: Oh Jo Kwon, Joo Hyung Lee, Kyung Youl Min
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Patent number: 10056032Abstract: An organic light-emitting display includes: a display panel including first and second pixels, each having an organic light-emitting diode; and a data driver including a first operational amplifier having a non-inverting terminal coupled to a reference voltage terminal and an inverting terminal coupled to the first pixel, and a second operational amplifier having a non-inverting terminal coupled to the reference voltage terminal and an inverting terminal coupled to the second pixel. The first pixel includes a sensing transistor, a first driving transistor, and a first switch transistor. The second pixel includes a second driving transistor and a second switch transistor.Type: GrantFiled: April 17, 2015Date of Patent: August 21, 2018Assignee: Samsung Display Co., Ltd.Inventors: Oh Jo Kwon, Joo Hyung Lee, Kyung Youl Min
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Patent number: 10044366Abstract: A non-linear gamma compensation current mode digital-analog converter includes: a first digital-analog converter block configured to: receive a digital signal, a first reference voltage, and a gamma adjustment voltage, and provide a reference current to a ground, wherein a first current flowing to a first current output terminal is determined according to the digital signal and the gamma adjustment voltage; and a second digital-analog converter block configured to: receive the digital signal, a second reference voltage, and a ground voltage, and provide the first current to the first digital-analog converter, wherein a second current flowing to a second current output terminal is determined according to the digital signal and the first current.Type: GrantFiled: March 18, 2014Date of Patent: August 7, 2018Assignees: Samsung Display Co., Ltd., Korea Advanced Institute of Science and TechnologyInventors: Oh Jo Kwon, Kyung Youl Min, Choong Sun Shin, Hee Sun Ahn, Hyun Sik Kim, Jun Suk Bang, Gyu Hyeong Cho
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Publication number: 20180082639Abstract: A display device includes pixels connected to data lines and scan lines, a first compensator which is connected to sensing lines and senses deviation information of the sensing lines while supplying different voltages to adjacent sensing lines, and a sensing unit which is connected to the first compensator and senses characteristic information of each of the pixels.Type: ApplicationFiled: September 8, 2017Publication date: March 22, 2018Inventors: Jeong Hwan SHIN, Sung Hoon BANG, Sang Jae YEO, Oh Jo KWON
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Patent number: 9875685Abstract: A display device includes: a display including a plurality of pixels; and a controller configured to: receive an external input image signal, adjust the external input image signal to compensate for brightness deviations of the pixels, and transmit corresponding image data signals to the pixels, wherein the controller includes: a data input section configured to receive the external input image signal and transmit a test image data signal to the pixels through a data driver, a luminance information extracting section configured to: extract brightness information for the pixels after displaying a test image in accordance with the test image data signal, and calculate first, second, and third parameters, using the brightness information, and a data compensating section configured to generate the image data signals by adjusting the external input image signal based on the first, second, and third parameters.Type: GrantFiled: July 1, 2013Date of Patent: January 23, 2018Assignee: Samsung Display Co., Ltd.Inventors: Oh-Jo Kwon, Won-Tae Choi, Choong-Sun Shin, Jeong-Kyoo Kim
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Patent number: 9875693Abstract: A data driver includes a data signal converter to convert image data to a data signal, an output buffer to output the data signal to a data line, a first cascode circuit connected to the output buffer and including a plurality of transistors, a first noise attenuator connected to a first node between the output buffer and the first cascode circuit, and to attenuate a first current noise, a second cascode circuit connected to the output buffer and including a plurality of transistors, a second noise attenuator connected a second node between the output buffer and the second cascode circuit, and to attenuate a second current noise, a current integrator to generate an integrated voltage by integrating a first current flowing through the first cascode circuit and a second current flowing through the second cascade circuit, and an analog-digital converter (ADC) to convert the integrated voltage to a digital signal.Type: GrantFiled: December 29, 2015Date of Patent: January 23, 2018Assignee: Samsung Display Co., Ltd.Inventors: Oh-Jo Kwon, Ji-Woong Kim, Choong-Sun Shin, Joo-Hyung Lee, Jun-Suk Bang, Gyu-Hyeong Cho
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Patent number: 9818341Abstract: An organic light-emitting display device includes: pixels; and a data driver including a plurality of current measurers connected to the pixels via at least one data line, each of the current measurers including: a first measurement circuit including: a first operational amplifier including a non-inverted input terminal to which a first reference voltage is applied, and an inverted input terminal connected to a first pixel from among the pixels; and a first feedback capacitor connected between the inverted input terminal and an output terminal of the first operational amplifier; and a second measurement circuit including: a second operational amplifier including a non-inverted input terminal to which a second reference voltage is applied, and an inverted input terminal connected to a second pixel from among the pixels; and a second feedback capacitor connected between the inverted input terminal and an output terminal of the second operational amplifier.Type: GrantFiled: March 17, 2015Date of Patent: November 14, 2017Assignee: Samsung Display Co., Ltd.Inventors: Oh Jo Kwon, Kyung Youl Min, Choong Sun Shin, Young Uk Won
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Patent number: 9805648Abstract: A display device is disclosed. In one aspect, the display device includes a plurality of pixels, a plurality of data lines respectively connected to the pixels, and a compensation unit connected to at least one the data lines. The compensation unit includes a first capacitor storing a leakage current of a pixel connected to the data line, a second capacitor storing a difference current, where the difference current is the difference between a reference current and a pixel current measured when a data signal of a reference gray signal is applied to the pixel. The compensation unit also includes a comparator outputting a difference value between the voltages stored in the first and second capacitors. According to embodiments, is possible to measure an accurate pixel current regardless of a leakage current and accurately detect deterioration of a pixel.Type: GrantFiled: April 15, 2014Date of Patent: October 31, 2017Assignee: Samsung Display Co., Ltd.Inventors: Bo Yeon Kim, Oh Jo Kwon, Choong Sun Shin