Patents by Inventor Yen-Cheng Cheng

Yen-Cheng Cheng 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: 11150760
    Abstract: A touch analog front-end circuit includes a current conveyor and an accumulator. The current conveyor receives a first voltage as an operation voltage, and generates a current signal according to a touch sensing signal received from a touch display panel. The accumulator is coupled to the current conveyor, receives a second voltage as an operation voltage, and generates an accumulating result according to the current signal and a reference voltage. The first voltage is higher than the second voltage.
    Type: Grant
    Filed: August 13, 2020
    Date of Patent: October 19, 2021
    Assignee: Novatek Microelectronics Corp.
    Inventor: Yen-Cheng Cheng
  • Patent number: 11099675
    Abstract: A display device, an operation, a driving circuit and a timing control circuit are provided. The display device includes a touch display panel, the driving circuit and the timing control circuit. The driving circuit drives the touch display panel to display image frames and perform touch detection. The timing control circuit outputs display data to the driving circuit through a data transmission path during a display period to display the image frame on the touch display panel. The driving circuit outputs touch detection data corresponding to the touch detection to the timing control circuit through the same data transmission path during a touch detection period.
    Type: Grant
    Filed: April 23, 2020
    Date of Patent: August 24, 2021
    Assignee: Novatek Microelectronics Corp.
    Inventors: Yen-Cheng Cheng, Hsiu-Hui Yang
  • Publication number: 20210225248
    Abstract: A display panel is provided. The display panel includes a pixel array, multiple data lines and first scan lines. The pixel array is arranged in multiple pixel rows by multiple pixel columns, and includes a first pixel row, a second pixel row, and a third pixel row which are adjacent pixel rows. The first scan line is coupled to multiple first pixel groups. Each first pixel group includes multiple first pixels in the first pixel row and multiple second pixels in the second pixel row adjacent to the first pixel row. A display driving circuit for driving a display panel is also provided.
    Type: Application
    Filed: January 14, 2021
    Publication date: July 22, 2021
    Applicant: Novatek Microelectronics Corp.
    Inventors: Yen-Cheng Cheng, Hsiu-Hui Yang
  • Publication number: 20210191539
    Abstract: The disclosure includes a touch display apparatus having AFE circuit that performs a noise cancellation of an AFE channel by utilizing noise signal received by a neighboring AFE channels. The first AFE channel includes a first integrator having an input terminal coupled to the first terminal receiving a first sensing signal. The second AFE channel includes an input amplifier. The second AFE channel is coupled between the input terminal of the first integrator in the first AFE channel and a second terminal connected to the touch panel. The second AFE channel is configured to generate a reversal input signal based on a second sensing signal received by the second terminal and couple the reversal input signal to a common node between the first integrator and the first terminal.
    Type: Application
    Filed: December 18, 2020
    Publication date: June 24, 2021
    Applicant: Novatek Microelectronics Corp.
    Inventor: Yen-Cheng Cheng
  • Patent number: 11025253
    Abstract: An output stage circuit includes a first operational amplifier, a second operational amplifier, a switch circuit, a clamp circuit and at least one pull-low transistor. The first operational amplifier is operated in a first voltage domain. The second operational amplifier is operated in a second voltage domain. The switch circuit is coupled to the first operational amplifier and the second operational amplifier. The clamp circuit is coupled between the switch circuit and a plurality of output terminals of the output stage circuit. The at least one pull-low transistor is coupled to the switch circuit.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: June 1, 2021
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Hsin-Hong Yang, Yen-Cheng Cheng
  • Patent number: 10991290
    Abstract: Control methods of a channel setting module applied to a display panel are provided. The display panel has gate lines, source lines, and pixels. The pixels are arranged in matrix. The pixels disposed at the same row are electrically connected to the same gate line, and the pixels disposed at the same column are electrically connected to the same source line. The adoption of the channel setting module reduces the control signals required by the source lines. The channel setting module includes operational amplifiers and de-mux switches, and the control methods dynamically determine conduction states of the de-mux switches. The voltage outputs of the operational amplifiers are selectively outputted to the source lines, depending on conduction statuses of the de-mux switches. By applying the control methods, the interference between the source lines are reduced, and the instantaneous overshoots/undershoots of floating channels are depressed.
    Type: Grant
    Filed: October 7, 2020
    Date of Patent: April 27, 2021
    Assignee: NOVATEK MICROELECTRONICS CORP.
    Inventors: Hsiu-Hui Yang, Yu-Shao Liu, Chin-Hung Hsu, Yen-Cheng Cheng
  • Patent number: 10977973
    Abstract: A display device and a detection method applied to the display device are provided. The display device includes a display panel, a source control circuit, and a leakage estimation circuit. The display panel includes pixels being arranged in M columns, wherein at least one panel-partition is defined on the display panel. The source control circuit includes M source drivers which respectively provide data voltages to the M columns of pixels. The leakage estimation circuit includes an evaluation circuit, a defect detection circuit, and a mode-switch. The evaluation circuit controls the defect detection circuit to perform a leakage estimation procedure so that a leakage current corresponding to the panel-partition is estimated when the at least one mode-switch is turned on.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: April 13, 2021
    Assignee: NOVATEK MICROELECTRONICS CORP.
    Inventors: Yen-Cheng Cheng, Hsiu-Hui Yang
  • Publication number: 20210096684
    Abstract: A driver chip including a receiving structure, a shielding structure, and a touch control circuit is provided. The receiving structure can receive a touch sensing signal. The shielding structure can be disposed aside the receiving structure. The shielding structure can shield at least one parasitic capacitor coupled to the receiving structure. The touch control circuit can be connected to the receiving structure and configured to receive the touch sensing signal. An electronic device including a driver chip is also provided.
    Type: Application
    Filed: May 25, 2020
    Publication date: April 1, 2021
    Applicant: Novatek Microelectronics Corp.
    Inventor: Yen-Cheng Cheng
  • Publication number: 20210090479
    Abstract: A display device and a detection method applied to the display device are provided. The display device includes a display panel, a source control circuit, and a leakage estimation circuit. The display panel includes pixels being arranged in M columns, wherein at least one panel-partition is defined on the display panel. The source control circuit includes M source drivers which respectively provide data voltages to the M columns of pixels. The leakage estimation circuit includes an evaluation circuit, a defect detection circuit, and a mode-switch. The evaluation circuit controls the defect detection circuit to perform a leakage estimation procedure so that a leakage current corresponding to the panel-partition is estimated when the at least one mode-switch is turned on.
    Type: Application
    Filed: September 25, 2019
    Publication date: March 25, 2021
    Inventors: Yen-Cheng CHENG, Hsiu-Hui YANG
  • Publication number: 20210048913
    Abstract: A touch analog front-end circuit includes a current conveyor and an accumulator. The current conveyor receives a first voltage as an operation voltage, and generates a current signal according to a touch sensing signal received from a touch display panel. The accumulator is coupled to the current conveyor, receives a second voltage as an operation voltage, and generates an accumulating result according to the current signal and a reference voltage. The first voltage is higher than the second voltage.
    Type: Application
    Filed: August 13, 2020
    Publication date: February 18, 2021
    Applicant: Novatek Microelectronics Corp.
    Inventor: Yen-Cheng Cheng
  • Publication number: 20210048912
    Abstract: A signal processing apparatus includes a first signal processing circuit and the second signal processing circuit. The first signal processing circuit receives a first signal. The first signal processing circuit has a power end connecting to a first voltage and a reference ground end. The second signal processing circuit receives a second signal. The second signal processing circuit has a power end which is electrically coupled to the reference ground end of the first signal processing circuit or equals the reference ground end of the first signal processing circuit. The second signal processing circuit has a reference ground end connecting to a second voltage.
    Type: Application
    Filed: August 13, 2020
    Publication date: February 18, 2021
    Applicant: Novatek Microelectronics Corp.
    Inventors: Yen-Cheng Cheng, Hsiu-Hui Yang
  • Publication number: 20210020135
    Abstract: An output circuit of a driver includes a plurality of output nodes, a first output buffer group and a multiplexer. The first output buffer group is configured to output data to the plurality of output nodes, wherein each output buffer in the first output buffer group is configured to output data to at least two output nodes among the plurality of output nodes. The multiplexer, coupled between the plurality of output nodes and the first output buffer group, is configured to select to couple each output buffer in the first output buffer group to one of the plurality of output nodes.
    Type: Application
    Filed: July 17, 2019
    Publication date: January 21, 2021
    Inventors: Hsiu-Hui Yang, Yen-Cheng Cheng, Chin-Hung Hsu
  • Patent number: 10848149
    Abstract: A channel circuit of source driver and an operation method thereof are provided. The channel circuit includes a digital-to-analog converter (DAC), a first switch, an output buffer circuit and a pre-charge circuit. The terminals of the first switch are coupled to the first output terminal of the DAC and the first input terminal of the output buffer circuit, respectively. The pre-charge circuit is coupled to the first input terminal of the output buffer circuit. The pre-charge circuit pre-charges the first input terminal of the output buffer circuit when the first switch is turned off during a pre-charge period, and not to pre-charge the first input terminal of the output buffer circuit when the first switch is turned on during a normal operation period.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: November 24, 2020
    Assignee: Novatek Microelectronics Corp.
    Inventors: Yen-Cheng Cheng, Kuang-Feng Sung
  • Publication number: 20200343892
    Abstract: An output stage circuit includes a first operational amplifier, a second operational amplifier, a switch circuit, a clamp circuit and at least one pull-low transistor. The first operational amplifier is operated in a first voltage domain. The second operational amplifier is operated in a second voltage domain. The switch circuit is coupled to the first operational amplifier and the second operational amplifier. The clamp circuit is coupled between the switch circuit and a plurality of output terminals of the output stage circuit. The at least one pull-low transistor is coupled to the switch circuit.
    Type: Application
    Filed: September 25, 2019
    Publication date: October 29, 2020
    Inventors: Hsin-Hong Yang, Yen-Cheng Cheng
  • Patent number: 10756749
    Abstract: A DAC device includes a first DAC circuit and a second DAC circuit. The first DAC circuit includes multiple DAC portions, each of which includes multiple pMOSFETs. The second DAC circuit includes multiple DAC portions, each of which includes multiple nMOSFETs. For each of the first and second DAC circuits, bulk terminals of at least some of the MOSFETs of each DAC portion are for receiving a respective one of bulk voltages with different magnitudes, a gate terminal of each of the MOSFETs of the DAC portions is for receiving a gate signal, and voltage magnitudes of at least some of the gate signals received by each DAC portion switch between a respective one of different logic high levels and a respective one of different logic low levels.
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: August 25, 2020
    Assignee: NOVATEK MICROELECTRONICS CORP.
    Inventor: Yen-Cheng Cheng
  • Patent number: 10673421
    Abstract: A level shifter device and an operation method thereof are provided. The level shifter device includes a buffer, a first level shifter and a dynamic voltage regulation circuit. The buffer includes an output terminal. The first level shifter has a first input terminal coupled to the output terminal of the buffer. The first level shifter has a reference voltage terminal coupled to an analog reference voltage. The dynamic voltage regulation circuit generates a dynamic voltage having a level varied according to a bounce of the analog reference voltage, and provides the dynamic voltage to at least one of the buffer as a power supply and the first level shifter as a bias voltage.
    Type: Grant
    Filed: October 21, 2019
    Date of Patent: June 2, 2020
    Assignee: Novatek Microelectronics Corp.
    Inventor: Yen-Cheng Cheng
  • Publication number: 20200028508
    Abstract: A channel circuit of source driver and an operation method thereof are provided. The channel circuit includes a digital-to-analog converter (DAC), a first switch, an output buffer circuit and a pre-charge circuit. The terminals of the first switch are coupled to the first output terminal of the DAC and the first input terminal of the output buffer circuit, respectively. The pre-charge circuit is coupled to the first input terminal of the output buffer circuit. The pre-charge circuit pre-charges the first input terminal of the output buffer circuit when the first switch is turned off during a pre-charge period, and not to pre-charge the first input terminal of the output buffer circuit when the first switch is turned on during a normal operation period.
    Type: Application
    Filed: March 5, 2019
    Publication date: January 23, 2020
    Applicant: Novatek Microelectronics Corp.
    Inventors: Yen-Cheng Cheng, Kuang-Feng Sung
  • Publication number: 20200027387
    Abstract: A channel circuit of a source driver, including a first digital-to-analog converter (DAC), a second DAC, a first switch, a second switch and an output buffer circuit, is provided. The output terminal of the output buffer circuit is configured to be coupled to a data line of a display panel. An output terminal of the first DAC is coupled to a first input terminal among the input terminals of the output buffer circuit. An output terminal of the second DAC is coupled to a second input terminal among the input terminals of the output buffer circuit. The first switch is disposed along a first signal path between the output terminal of the first DAC and the output terminal of the output buffer circuit. The second switch is disposed along a second signal path between the output terminal of the second DAC and the output terminal of the output buffer circuit.
    Type: Application
    Filed: July 22, 2019
    Publication date: January 23, 2020
    Applicant: Novatek Microelectronics Corp.
    Inventors: Yen-Cheng Cheng, Hsiu-Hui Yang
  • Patent number: 10418998
    Abstract: A level shifter circuit which includes a cross-coupled latch and a set-reset latch is introduced. The level shifter circuit includes a first input node, a second input node and a plurality of switches. The first input node and the second input node are configured to receive a first digital input signal and a second digital input signal, respectively. The plurality of switches are configured to be switched on or off according to at least one control signal to output a first output signal and a second output signal. The set-reset latch is coupled to the cross-coupled latch and includes a set input node, a reset input node and an output node. The set input node and the reset input node are configured to receive the first output signal and the second output signal of the cross-coupled latch, respectively. The output node outputs a level-shifted output signal according to the first output signal and the second output signal of the cross-coupled latch. A method adapted to a level shifter circuit is also introduced.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: September 17, 2019
    Assignee: Novatek Microelectronics Corp.
    Inventor: Yen-Cheng Cheng
  • Patent number: 10367504
    Abstract: A negative voltage level shifter includes a pair of input transistors, a pair of output transistors and a clamp circuit. The clamp circuit is coupled between the pair of input transistors and the pair of output transistors, for clamping source voltages of the pair of input transistors.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: July 30, 2019
    Assignee: NOVATEK Microelectronics Corp.
    Inventor: Yen-Cheng Cheng