Patents by Inventor Hongjun Xie

Hongjun Xie 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).

  • Patent number: 10657897
    Abstract: The present invention provides a driving compensation circuit for an organic light-emitting diode (OLED) display unit. The OLED display unit includes: N first switching transistors, N second switching transistors, N sensing units, and a calculation and processing unit. The calculation and processing unit is configured to calculate a mapping relationship between a data voltage of the data line and current information, and to calculate a data compensation voltage in a display phase according to second current information and the mapping relationship.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: May 19, 2020
    Assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
    Inventors: Xiaolong Chen, Hongjun Xie
  • Patent number: 10650744
    Abstract: Disclosed is a method for compensating a pixel driving circuit of an OLED display panel. In the compensation method, a driving transistor is enabled to operate stably in a saturation region for twice, and a threshold voltage of the driving transistor is calculated based on a collected charging voltage and charging time. A pixel driving circuit is compensated by establishing a threshold-voltage compensation table. The compensation method is easy to operate and can significantly improve a detecting speed of a threshold voltage. Moreover, an effect of a voltage-current conversion factor on detecting accuracy of a threshold voltage can be avoided.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: May 12, 2020
    Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Yufeng Jin, Hongjun Xie
  • Patent number: 10643535
    Abstract: A driving method for preventing image sticking of a display panel (805) upon shutdown, and a display device (800). The method includes: receiving a shutdown signal (S01, S16); and adjusting driving signals of a sub-pixel circuit (708, 810) of the display panel (805), so as to reduce the voltage difference between a gate electrode and a source electrode of a driving transistor (T1) of the sub-pixel circuit, and hence allowing the display panel (805) to enter an image sticking prevention mode (S02, S17). The method can prevent image sticking of the display panel (805) at the time of shutdown and hence improve the display quality.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: May 5, 2020
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Fei Yang, Song Meng, Hongjun Xie, Quanhu Li, Yue Wu, Yu Wang
  • Publication number: 20200118522
    Abstract: The present disclosure provides a data driving circuit and a driving method thereof, a data driving system and a display device. In an embodiment of a data driving circuit, each digital to analog conversion unit is only used for driving sub-pixels of one color, and by controlling on-off of the switch unit, one data line interface unit is enabled to be connected to different digital to analog conversion units when driving sub-pixels of different colors. In this way, a reference voltage can be provided to the digital to analog conversion unit for driving different color display by a single physical Gamma circuit, without having to use a digital Gamma circuit. Therefore, gray scale loss caused by adjustment using the digital Gamma circuit can be avoided fundamentally.
    Type: Application
    Filed: December 11, 2019
    Publication date: April 16, 2020
    Inventor: Hongjun XIE
  • Patent number: 10546552
    Abstract: The present disclosure provides a data driving circuit and a driving method thereof, a data driving system and a display device. In an embodiment of a data driving circuit, each digital to analog conversion unit is only used for driving sub-pixels of one color, and by controlling on-off of the switch unit, one data line interface unit is enabled to be connected to different digital to analog conversion units when driving sub-pixels of different colors. In this way, a reference voltage can be provided to the digital to analog conversion unit for driving different color display by a single physical Gamma circuit, without having to use a digital Gamma circuit. Therefore, gray scale loss caused by adjustment using the digital Gamma circuit can be avoided fundamentally.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: January 28, 2020
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventor: Hongjun Xie
  • Publication number: 20200005711
    Abstract: A driving method for preventing image sticking of a display panel (805) upon shutdown, and a display device (800). The method includes: receiving a shutdown signal (S01, S16); and adjusting driving signals of a sub-pixel circuit (708, 810) of the display panel (805), so as to reduce the voltage difference between a gate electrode and a source electrode of a driving transistor (T1) of the sub-pixel circuit, and hence allowing the display panel (805) to enter an image sticking prevention mode (S02, S17). The method can prevent image sticking of the display panel (805) at the time of shutdown and hence improve the display quality.
    Type: Application
    Filed: August 29, 2019
    Publication date: January 2, 2020
    Inventors: Fei YANG, Song MENG, Hongjun XIE, Quanhu LI, Yue WU, Yu WANG
  • Publication number: 20190385525
    Abstract: Disclosed is a method for compensating a pixel driving circuit of an OLED display panel. In the compensation method, a driving transistor is enabled to operate stably in a saturation region for twice, and a threshold voltage of the driving transistor is calculated based on a collected charging voltage and charging time. A pixel driving circuit is compensated by establishing a threshold-voltage compensation table. The compensation method is easy to operate and can significantly improve a detecting speed of a threshold voltage. Moreover, an effect of a voltage-current conversion factor on detecting accuracy of a threshold voltage can be avoided.
    Type: Application
    Filed: August 25, 2017
    Publication date: December 19, 2019
    Applicant: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventors: Yufeng Jin, Hongjun Xie
  • Patent number: 10510313
    Abstract: A driving circuit, a driving method and a display apparatus are provided. The driving circuit comprises: a gate driving module; a timing control module; and a chamfered wave generating circuit, an input terminal thereof being connected with the timing control module, an output terminal thereof being connected with an input terminal of the gate driving module, and being configured to discharge a power supply voltage provided by a power supply of the display apparatus under an effect of a timing control signal output by the gate driving module, so that the gate driving module outputs a chamfered wave scanning signal. The display quality of the display apparatus can be improved.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: December 17, 2019
    Assignee: BOE Technology Group Co., Ltd.
    Inventor: Hongjun Xie
  • Patent number: 10490124
    Abstract: The present disclosure provides an AMOLED external electrical compensation detection method, in the display mode, estimating a cross-voltage between the drain and the source of the detecting TFT, calculating a gate-source voltage of the driving TFT based on the estimated value, it is possible to improve the writing precision of the gate-source voltage of the driving TFT; in the detection mode, estimating a cross-voltage between the drain and the source of the detecting TFT, calculating a source voltage of the driving TFT based on the estimated value, calculating the threshold voltage and the carrier mobility of the driving TFT based on the calculated voltage of the source of the driving TFT, it is possible to reduce the calculation error between the threshold voltage and the carrier mobility of the driving TFT and improve the accuracy of the external electrical compensation detection of the AMOLED.
    Type: Grant
    Filed: November 25, 2017
    Date of Patent: November 26, 2019
    Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
    Inventor: Hongjun Xie
  • Patent number: 10446077
    Abstract: A driving method for preventing image sticking of a display panel upon shutdown, and a display device. The method includes: receiving a shutdown signal; and adjusting driving signals of a sub-pixel circuit of the display panel, so as to reduce the voltage difference between a gate electrode and a source electrode of a driving transistor of the sub-pixel circuit, and hence allowing the display panel to enter an image sticking prevention mode. The method can prevent image sticking of the display panel at the time of shutdown and hence improve the display quality.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: October 15, 2019
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Fei Yang, Song Meng, Hongjun Xie, Quanhu Li, Yue Wu, Yu Wang
  • Publication number: 20190311677
    Abstract: The present invention provides a driving compensation circuit for an organic light-emitting diode (OLED) display unit. The OLED display unit includes: N first switching transistors, N second switching transistors, N sensing units, and a calculation and processing unit. The calculation and processing unit is configured to calculate a mapping relationship between a data voltage of the data line and current information, and to calculate a data compensation voltage in a display phase according to second current information and the mapping relationship.
    Type: Application
    Filed: May 7, 2018
    Publication date: October 10, 2019
    Inventors: Xiaolong CHEN, Hongjun XIE
  • Patent number: 10410584
    Abstract: An aging compensation system and an aging compensation method for an organic light emitting diode (OLED) device are disclosed, the aging compensation system for the OLED device comprises a plurality of pixel circuits, a plurality of data lines, a plurality of sense lines, a first power supply, a second power supply, and a source driving chip, the pixel circuit comprises an OLED device and a driving transistor. The number of sense lines and the number of the data lines are equal, each of the sense lines is cooperating with each of the data lines in connection with the pixel circuits, the sense line is connected to an anode of the OLED device via a first transistor; the first power supply is connected to the driving transistor, the second power supply is connected to a cathode of the OLED device; the source driving chip is connected to the data line.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: September 10, 2019
    Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
    Inventor: Hongjun Xie
  • Publication number: 20190228702
    Abstract: The present disclosure provides an AMOLED external electrical compensation detection method, in the display mode, estimating a cross-voltage between the drain and the source of the detecting TFT, calculating a gate-source voltage of the driving TFT by the estimated value, it is possible to improve the writing precision of the gate-source voltage of the driving TFT; in the detection mode, estimating a cross-voltage between the drain and the source of the detecting TFT, calculating a source voltage of the driving TFT by the estimated value, calculating the threshold voltage and the carrier mobility of the driving TFT by the calculated voltage of the source of the driving TFT, it is possible to reduce the calculation error between the threshold voltage and the carrier mobility of the driving TFT and improve the accuracy of the external electrical compensation detection of the AMOLED.
    Type: Application
    Filed: November 25, 2017
    Publication date: July 25, 2019
    Inventor: Hongjun XIE
  • Patent number: 10283051
    Abstract: The invention provides an OLED pixel driving circuit and OLED display device. The OLED pixel driving circuit uses 5T1C structure and switch (K). By switch signal (Switch) controlling the switch (K) to connect first pin (K1) and second pin (K2) to enter display mode, and to connect first pin (K1) and third pin (K3) to enter sense mode, the ADC (ADC) senses the threshold voltage of the fourth TFT (T4), converted and used for data compensation in the display mode, able to compensate and eliminate the impact of threshold voltage of the fourth TFT (T4) on the current flowing through the OLED (D1); the light-emitting control signal (EM) controls the fifth TFT (T5) connected to the OLED (D1) to cut off during the data writing stage (t1) to keep the data signal voltage and the gate voltage of the fourth TFT (T4) unaffected by the OLED (D1) threshold voltage.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: May 7, 2019
    Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
    Inventors: Jimu Kuang, Hongjun Xie
  • Patent number: 10262741
    Abstract: A read and write control circuit for a flash chip is disclosed which includes a timing control circuit for generating a read and write timing signal for the flash chip, and a first non-volatile memory for storing a plurality of flags corresponding to a plurality of blocks in the flash chip, each of the flags indicating whether a respective one of the blocks that corresponds thereto has been written to normally. Also disclosed is a read and write control method of a flash chip, as well as an AMOLED application circuit having the read and write control circuit for use in an electrical compensation mechanism.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: April 16, 2019
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventor: Hongjun Xie
  • Publication number: 20190073954
    Abstract: The invention provides an OLED pixel driving circuit and OLED display device. The OLED pixel driving circuit uses 5T1C structure and switch (K). By switch signal (Switch) controlling the switch (K) to connect first pin (K1) and second pin (K2) to enter display mode, and to connect first pin (K1) and third pin (K3) to enter sense mode, the ADC (ADC) senses the threshold voltage of the fourth TFT (T4), converted and used for data compensation in the display mode, able to compensate and eliminate the impact of threshold voltage of the fourth TFT (T4) on the current flowing through the OLED (D1); the light-emitting control signal (EM) controls the fifth TFT (T5) connected to the OLED (D1) to cut off during the data writing stage (t1) to keep the data signal voltage and the gate voltage of the fourth TFT (T4) unaffected by the OLED (D1) threshold voltage.
    Type: Application
    Filed: November 27, 2017
    Publication date: March 7, 2019
    Inventors: Jimu Kuang, Hongjun Xie
  • Publication number: 20190073952
    Abstract: The invention provides an OLED pixel driving circuit and OLED display device. The OLED pixel driving circuit uses 4T1C structure and switch (K). The first pin (K1) of switch (K) is connected to the drain of the third TFT (T3), the second pin (K2) connected to the DAC (DAC), and the third pin (K3) connected to the ADC (ADC). By the switch signal (Switch) controlling the switch (K), the first pin (K1) and the second pin (K3) are connected to enter the display mode, and by the switch signal (Switch) controlling the switch (K), the first pin (K1) and the third pin (K3) are connected to enter the sense mode, so that the ADC (ADC) senses the threshold voltage of the fourth TFT (T4), converted by ADC (ADC) for data compensation in the display mode. The invention can compensate, improve display uniform, improve pixel aperture ratio and reduce manufacturing cost.
    Type: Application
    Filed: November 27, 2017
    Publication date: March 7, 2019
    Inventors: Jimu Kuang, Hongjun Xie
  • Patent number: 10223972
    Abstract: The invention provides an OLED pixel driving circuit and OLED display device. The OLED pixel driving circuit uses 4T1C structure and switch (K). The first pin (K1) of switch (K) is connected to the drain of the third TFT (T3), the second pin (K2) connected to the DAC (DAC), and the third pin (K3) connected to the ADC (ADC). By the switch signal (Switch) controlling the switch (K), the first pin (K1) and the second pin (K3) are connected to enter the display mode, and by the switch signal (Switch) controlling the switch (K), the first pin (K1) and the third pin (K3) are connected to enter the sense mode, so that the ADC (ADC) senses the threshold voltage of the fourth TFT (T4), converted by ADC (ADC) for data compensation in the display mode. The invention can compensate, improve display uniform, improve pixel aperture ratio and reduce manufacturing cost.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: March 5, 2019
    Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
    Inventors: Jimu Kuang, Hongjun Xie
  • Patent number: 10170046
    Abstract: The embodiments of the present invention provide an OLED display device and a method for correcting image sticking of an OLED display device. The OLED display device comprises an OLED pixel array; a pixel detecting circuit for detecting aging degrees of respective OLED pixels in the OLED pixel array; wherein respective OLED pixel are aged by displaying an aging image on the OLED pixel array, such that the aging degrees of respective OLED pixels are the same; the brightness of each pixel in the aging image is inversely proportional to the aging degree of the pixel. According to the OLED display device and the method provided by the embodiments of the present invention, various approaches can be applied for detecting the aging degrees of respective OLED pixels in the OLED pixel array, such that the image sticking of the OLED display device can be corrected by adjusting the aging degrees of respective OLED pixels.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: January 1, 2019
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventor: Hongjun Xie
  • Patent number: 10140948
    Abstract: The present disclosure provides a method for adjusting gate driving voltages for a gate driving circuit, output terminals of the gate driving circuit being connected with gate lines, an input terminal of the gate driving circuit being connected with a propel link gate (PLG) wiring. The method includes determining a voltage-drop value at an electrical connection point along the PLG wiring with respect to an input terminal of the PLG wiring, the electrical connection point connecting an input terminal of the gate driving circuit with the input terminal of the PLG wiring; and compensating the gate driving voltage on the input terminal of the gate driving circuit based on the voltage-drop value.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: November 27, 2018
    Assignee: BOE TECHNOLOGY GROUP CO., LTD
    Inventor: Hongjun Xie