Patents by Inventor Yen-Tao Liao

Yen-Tao Liao 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: 11508305
    Abstract: A driving method of LED display, configured to be applied to an LED display capable of varying a refresh rate thereof and able to reduce brightness changes due to refresh rate variation, is disclosed in the present disclosure. This driving method includes: controlling an organic light-emitting diode of the LED display by an emission signal having a plurality of frame periods, with each of the frame periods having a PWM part with a duty ratio; detecting whether a change in the refresh rate of the LED display exists; and performing a compensation procedure when the change is detected, with the compensation procedure compensating a brightness difference of the organic light-emitting diode occurring due to the change in the refresh rate by adjusting the duty ratio of the PWM part. Said LED display is also disclosed.
    Type: Grant
    Filed: August 18, 2020
    Date of Patent: November 22, 2022
    Assignee: Novatek Microelectronics Corp.
    Inventors: Huifeng Lin, Yen-Tao Liao
  • Patent number: 11495177
    Abstract: The present invention provides an image processing circuit for compensating image data for a display panel used for displaying first and second image patterns respectively having first and second current loadings. The image processing circuit is used for: receiving a first original image data of the first image pattern and a second original image data of the second image pattern having the same brightness value for a pixel at the same location; converting the first original image data into a first final image data to compensate for an IR drop according to the first current loading; and converting the second original image data into a second final image data to compensate for the IR drop according to the second current loading. The first final image data and the second final image data have substantially the same brightness value for the pixel at the same location.
    Type: Grant
    Filed: July 7, 2021
    Date of Patent: November 8, 2022
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Hui-Feng Lin, Yen-Tao Liao
  • Patent number: 11483530
    Abstract: A color compensation method includes obtaining a target brightness, a target frame rate and a target pulse number; selecting a plurality of second gamma groups from a plurality of first gamma groups according to the target brightness and the target pulse number, wherein the plurality of first gamma groups respectively correspond to a plurality of frame rates; and calculating the compensation value to compensate the display brightness and color according to the target brightness, the target frame rate, the plurality of second gamma groups and a calculation method.
    Type: Grant
    Filed: March 14, 2022
    Date of Patent: October 25, 2022
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: En-Shi Shih, Yen-Tao Liao, Shih-Ting Huang
  • Patent number: 11461888
    Abstract: The disclosure provides a method and an image processor for computing decay factors for display degradation compensation. The method includes the following steps. A sequence of frames including a current frame are received. Whether the current frame is a dynamic frame or a static frame is determined. When the current frame is the dynamic frame, accumulation on decay factors is performed. When the current frame is the static frame, accumulation on the decay factors is not performed.
    Type: Grant
    Filed: July 20, 2020
    Date of Patent: October 4, 2022
    Assignee: Novatek Microelectronics Corp.
    Inventors: Li-Chieh Chen, Yen-Tao Liao
  • Publication number: 20220293028
    Abstract: A timing control device for the display panel includes a control circuit. The control circuit is configured to generate a plurality of gate scanning control signals and a data transmission control signal. In response to that a display refresh rate changes from a first frequency to a second frequency, the control circuit adjusts the plurality of gate scanning control signals to generate a plurality of adjusted gate scanning control signals, or adjusts the data transmission control signal to generate an adjusted data transmission control signal, for driving a display panel under the second frequency as the display refresh rate.
    Type: Application
    Filed: March 11, 2022
    Publication date: September 15, 2022
    Applicant: Novatek Microelectronics Corp.
    Inventors: Grace Li, Jen-Ta Yang, Yen-Tao Liao, Yu-Hung Su
  • Patent number: 11373607
    Abstract: A driving method of display device for a display device capable of reducing flicker due to refresh rate variation includes: determining whether a processor of the display device is generating a vertical blank interval of an image signal, wherein said vertical blank interval is next to a last frame data period thereof, and the last frame data period is for a last frame to be displayed by a display panel; and activating a data line of the display panel with a balancing voltage related to data of a line of the last frame when the processor is generating the vertical blank interval, wherein a plurality of sub-pixels of the display panel connects to the data line, the data of the line of the last frame are sequentially transmitted to the plurality of sub-pixels in the last frame data period for displaying the last frame. Said display device is also disclosed.
    Type: Grant
    Filed: March 16, 2020
    Date of Patent: June 28, 2022
    Assignee: Novatek Microelectronics Corp.
    Inventors: Yu-Hung Su, Vans Shih, Yen-Tao Liao
  • Publication number: 20220044447
    Abstract: An image processing method including the following steps is provided. An image information of an image is received, wherein the image includes a plurality of blocks and the image information includes a plurality of pixel information of each block. A dual gamma correction is performed on a first group of blocks of the image to obtain one or more corrected blocks and the dual gamma correction is skipped on a second group of blocks of the image to obtain a plurality of uncorrected blocks. A first encoding process is performed on the one or more corrected blocks to obtain a plurality of first encoded blocks. A second encoding process different from the first encoding process is performed on the plurality of uncorrected blocks to obtain a plurality of second encoded blocks.
    Type: Application
    Filed: August 7, 2020
    Publication date: February 10, 2022
    Applicant: Novatek Microelectronics Corp.
    Inventors: Hui-Yu Jiang, Heng-Yao Lin, Yen-Tao Liao
  • Publication number: 20220020133
    Abstract: The disclosure provides a method and an image processor for computing decay factors for display degradation compensation. The method includes the following steps. A sequence of frames including a current frame are received. Whether the current frame is a dynamic frame or a static frame is determined. When the current frame is the dynamic frame, accumulation on decay factors is performed. When the current frame is the static frame, accumulation on the decay factors is not performed.
    Type: Application
    Filed: July 20, 2020
    Publication date: January 20, 2022
    Applicant: Novatek Microelectronics Corp.
    Inventors: Li-Chieh Chen, Yen-Tao Liao
  • Publication number: 20220013068
    Abstract: The present invention provides an image processing circuit for compensating image data for a display panel used for displaying first and second image patterns respectively having first and second current loadings. The image processing circuit is used for: receiving a first original image data of the first image pattern and a second original image data of the second image pattern having the same brightness value for a pixel at the same location; converting the first original image data into a first final image data to compensate for an IR drop according to the first current loading; and converting the second original image data into a second final image data to compensate for the IR drop according to the second current loading. The first final image data and the second final image data have substantially the same brightness value for the pixel at the same location.
    Type: Application
    Filed: July 7, 2021
    Publication date: January 13, 2022
    Applicant: NOVATEK Microelectronics Corp.
    Inventors: Hui-Feng Lin, Yen-Tao Liao
  • Patent number: 11222614
    Abstract: An image processing method with auto-adjusting gamma value is provided. This image processing method includes: receiving a detected value dependent upon a view angle between a normal direction of a screen and a sight direction of a viewer to the screen; receiving an original video frame with a plurality of pixels; determining at least one gamma table to obtain a gamma value for a pixel of the plurality of pixels according to the detected value, wherein there is an original pixel value corresponding to the pixel; and generating and outputting a corrected pixel value of the pixel based on the gamma value and the original pixel value of the pixel, wherein the screen is configured to show a corrected video frame having the pixel with the corrected pixel value. An image processing assembly and an image processing system are also provided.
    Type: Grant
    Filed: August 5, 2020
    Date of Patent: January 11, 2022
    Assignee: Novatek Microelectronics Corp.
    Inventors: Yun-Shu Yang, Yen-Tao Liao, Jen-Ta Yang
  • Patent number: 11140393
    Abstract: A display device that includes an encoder circuit, a decoder circuit and an overdrive circuit is introduced. The encoder circuit includes a prediction circuit, a quantization circuit, and a bitstream coding circuit. The prediction circuit performs a prediction operation on a first image frame to generate a second image frame. The quantization circuit performs a quantization operation on the second image frame based on a quantization parameter to generated a quantized image frame. The bitstream coding circuit encodes the quantized image frame to generate an encoded bit stream. The quantization parameter is determined according to a grey level of a pixel in the second image frame. The decoder circuit decodes the encoded bit stream to generate a reconstructed image frame. The overdrive circuit generates an overdrive image frame to be displayed on a display panel based on a third image frame and the reconstructed image frame.
    Type: Grant
    Filed: June 10, 2020
    Date of Patent: October 5, 2021
    Assignee: Novatek Microelectronics Corp.
    Inventors: Hui-Yu Jiang, Heng-Yao Lin, Yen-Tao Liao
  • Publication number: 20210287619
    Abstract: A driving method of display device for a display device capable of reducing flicker due to refresh rate variation includes: determining whether a processor of the display device is generating a vertical blank interval of an image signal, wherein said vertical blank interval is next to a last frame data period thereof, and the last frame data period is for a last frame to be displayed by a display panel; and activating a data line of the display panel with a balancing voltage related to data of a line of the last frame when the processor is generating the vertical blank interval, wherein a plurality of sub-pixels of the display panel connects to the data line, the data of the line of the last frame are sequentially transmitted to the plurality of sub-pixels in the last frame data period for displaying the last frame. Said display device is also disclosed.
    Type: Application
    Filed: March 16, 2020
    Publication date: September 16, 2021
    Applicant: NOVATEK MICROELECTRONICS CORP.
    Inventors: Yu-Hung SU, Vans SHIH, Yen-Tao LIAO
  • Patent number: 11087663
    Abstract: A driving method of display device configured to be applied to a display device capable of reducing the difference in brightness between areas with different widths of a display panel includes: receiving an input signal by a processor to generate an image signal and an original data enable signal, with the image signal and the original data enable signal configured to control the display panel; and generating a gate control signal and a transmission signal by the controller based on the image signal and the original data enable signal for a scan line driver and a data line driver respectively. The gate control signal comprises a plurality of enable periods for activating the plurality of scan lines respectively, and widths of the enable periods for activating scan lines with different lengths are different. Said display device and a display driving circuit are also disclosed.
    Type: Grant
    Filed: May 15, 2020
    Date of Patent: August 10, 2021
    Assignee: Novatek Microelectronics Corp.
    Inventors: Yu-Hung Su, Grace Li, Yen-Tao Liao
  • Patent number: 11056044
    Abstract: A method of compensating pixel data for a display panel includes the steps of: receiving a first pixel data and a second pixel data respectively corresponding to two adjacent data lines of the display panel; generating a compensation pixel data by searching a lookup table based on the first pixel data and the second pixel data; and transmitting the compensation pixel data to one of the two adjacent data lines to be displayed on the display panel.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: July 6, 2021
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Hsien-Po Huang, Yen-Tao Liao
  • Publication number: 20210201793
    Abstract: A driving method of LED display, configured to be applied to an LED display capable of varying a refresh rate thereof and able to reduce brightness changes due to refresh rate variation, is disclosed in the present disclosure. This driving method includes: controlling an organic light-emitting diode of the LED display by an emission signal having a plurality of frame periods, with each of the frame periods having a PWM part with a duty ratio; detecting whether a change in the refresh rate of the LED display exists; and performing a compensation procedure when the change is detected, with the compensation procedure compensating a brightness difference of the organic light-emitting diode occurring due to the change in the refresh rate by adjusting the duty ratio of the PWM part. Said LED display is also disclosed.
    Type: Application
    Filed: August 18, 2020
    Publication date: July 1, 2021
    Applicant: NOVATEK MICROELECTRONICS CORP.
    Inventors: Huifeng LIN, Yen-Tao LIAO
  • Patent number: 11024242
    Abstract: A timing controller and an operation method thereof are provided. The timing controller is used to control a signal timing of a display panel. The timing controller includes an analysis circuit and a decision circuit. The analysis circuit analyzes the content of an image frame to obtain an analysis result. The decision circuit is coupled to the analysis circuit to receive the analysis result. The decision circuit determines a global gray level according to the analysis result. In a blanking interval in which a plurality of sub-pixel circuits of the display panel are turned off, a data voltage corresponding to the global gray level is applied to at least one data line of the display panel corresponding to the sub-pixel circuits.
    Type: Grant
    Filed: March 11, 2020
    Date of Patent: June 1, 2021
    Assignee: Novatek Microelectronics Corp.
    Inventors: Hui-Feng Lin, Yen-Tao Liao
  • Patent number: 10957236
    Abstract: The present invention discloses a driving method for a source driver, for driving a source line of a display panel. The driving method includes the steps of: driving the source line with a first voltage or a second voltage smaller than the first voltage in a first driving cycle; driving the source line with the first voltage in a second driving cycle next to the first driving cycle when the source line is driven with the first voltage in the first driving cycle; and driving the source line with an overdrive voltage in the second driving cycle when the source line is driven with the second voltage in the first driving cycle. The first voltage is a normal high voltage of the display panel, and the overdrive voltage is greater than the normal high voltage.
    Type: Grant
    Filed: April 26, 2019
    Date of Patent: March 23, 2021
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Yen-Tao Liao, Hung-Hsiang Chen, Jen-Ta Yang, Yi-Wei Lin, Huang-Chin Tang
  • Patent number: 10943531
    Abstract: The present invention provides a decay factor accumulation method for an organic light-emitting diode (OLED) display panel with a variable refresh rate (VRR). The decay factor accumulation method includes detecting an operating frame rate of an input image; generating a decay factor compensation coefficient according to the operating frame rate and a measurement frame rate; and generating a plurality of accumulated decay factors of the input image according to a decay factor lookup table corresponding to the measurement frame rate and the decay factor compensation coefficient.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: March 9, 2021
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Li-Chieh Chen, Yen-Tao Liao
  • Publication number: 20210043153
    Abstract: A method of gray level adjustment for an image data generator includes receiving a plurality of image frames including a first image frame and a second image frame next to the first image frame, wherein the first image frame includes a first input subpixel data corresponding to a first subpixel of a display panel and the second image frame includes a second input subpixel data corresponding to the first subpixel; with respect to the first input subpixel data, outputting a first gray level data of a first gamma lookup table as a first output subpixel data; and with respect to the second input subpixel data, outputting a second gray level data of a second gamma lookup table as a second output subpixel data. The first output subpixel data and the second output subpixel data are corresponding to the first subpixel of the display panel.
    Type: Application
    Filed: August 22, 2019
    Publication date: February 11, 2021
    Inventors: Yun-Shu Yang, Yen-Tao Liao, Hongchun Cong
  • Patent number: 10909937
    Abstract: A driver circuit is coupled to a dual cell panel having a first cell and a second cell superposed on each other. The driver circuit includes a second cell processor and a first cell processor. The second cell processor is configured to generate a gray scale data for the second cell. The first cell processor includes a pixel data compensation circuit and a white tracking compensation circuit. The pixel data compensation circuit is configured to compensate an image data for the first cell according to a brightness of the image data. The white tracking compensation circuit is configured to compensate the image data for the first cell according to a color temperature of the gray scale data.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: February 2, 2021
    Assignee: NOVATEK Microelectronics Corp.
    Inventors: Hsien-Po Huang, Yen-Tao Liao, Hongchun Cong