Patents Assigned to SAPIEN SEMICONDUCTORS INC.
  • Patent number: 11238783
    Abstract: The present embodiments disclose a pixel and a display device including the same. A pixel according to an embodiment of the present disclosure includes a luminous element and a pixel circuit connected to the luminous element, wherein the pixel circuit includes a first pixel circuit configured to control light-emission and non-emission of the luminous element in response to a control signal applied to each of a plurality of subframes constituting a frame during a light-emitting period and a second pixel circuit storing a bit value of image data in a data writing period and generating the control signal based on the bit value and a clock signal in the light-emitting period.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: February 1, 2022
    Assignee: SAPIEN SEMICONDUCTORS INC.
    Inventor: Jae Hoon Lee
  • Patent number: 11170705
    Abstract: The present specification provides a pixel circuit miniaturized using a smaller number of transistors as compared with the related art. A 4T static random-access memory (SRAM) is used in an embedded pixel memory, and in order to prevent a voltage floating problem from occurring in a logic low state, a leakage current is designed to flow in one direction by adjusting a threshold voltage of a transistor. In addition, a pulse width modulation (PWM) control unit uses a smaller number of transistors as compared with the related art, and in order to prevent a voltage floating problem from occurring, a circuit capable of removing a floating voltage is provided.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: November 9, 2021
    Assignee: SAPIEN SEMICONDUCTORS INC.
    Inventors: Jae Hoon Lee, Jin Woong Jang
  • Patent number: 11138922
    Abstract: The present specification discloses a light-emitting diode (LED) driving apparatus in which a voltage drop phenomenon due to a common impedance is mitigated. In the LED driving apparatus according to the present specification, a circuit is configured by combining N-type metal-oxide-semiconductor (NMOS) transistors or P-type MOS (PMOS) transistors such that a positive power source or a negative power source is not connected to a source terminal of a metal oxide semiconductor field-effect transistor (MOSFET). To this end, it is possible to eliminate common impedance effects on the positive power source or the negative power source.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: October 5, 2021
    Assignee: SAPIEN SEMICONDUCTORS INC.
    Inventors: Jae Hoon Lee, Jin Woong Jang
  • Publication number: 20210233463
    Abstract: The present specification provides a pixel circuit miniaturized using a smaller number of transistors as compared with the related art. A 4T static random-access memory (SRAM) is used in an embedded pixel memory, and in order to prevent a voltage floating problem from occurring in a logic low state, a leakage current is designed to flow in one direction by adjusting a threshold voltage of a transistor. In addition, a pulse width modulation (PWM) control unit uses a smaller number of transistors as compared with the related art, and in order to prevent a voltage floating problem from occurring, a circuit capable of removing a floating voltage is provided.
    Type: Application
    Filed: January 22, 2021
    Publication date: July 29, 2021
    Applicant: SAPIEN SEMICONDUCTORS INC.
    Inventors: Jae Hoon Lee, Jin Woong Jang
  • Publication number: 20210233491
    Abstract: Provided are a display device and a method of controlling a brightness of the display device. The method of controlling a brightness of the display device according to an embodiment includes: applying first input image data to a display unit including a plurality of pixels to display a first image; detecting a brightness for each pixel from output image data of the first image displayed on the display unit, and extracting compensation pixels each having a brightness difference exceeding a reference value, the brightness difference being a difference between a detected brightness and a reference brightness; and generating compensation data of the compensation pixels based on the brightness differences of the compensation pixels.
    Type: Application
    Filed: August 9, 2018
    Publication date: July 29, 2021
    Applicant: SAPIEN SEMICONDUCTORS INC.
    Inventor: Jae Hoon LEE
  • Publication number: 20210217343
    Abstract: The present specification provides a display apparatus allowing brightness of a display panel to be more finely controlled as compared with the related art. The display apparatus according to the present specification includes a display panel in which a plurality of pixels are arranged in m×n, and K shift register units configured to sequentially output pulse signals having a width adjusted to adjust brightness of the display panel to m horizontal pixel lines, wherein each of the shift register units includes m main flip-flops and m?1 sub-flip-flops connected between the in main flip-flops.
    Type: Application
    Filed: January 14, 2021
    Publication date: July 15, 2021
    Applicant: SAPIEN SEMICONDUCTORS INC.
    Inventors: Jae Hoon Lee, Jin Woong Jang
  • Publication number: 20210049957
    Abstract: The present embodiments disclose a pixel and a display device including the same. A pixel according to an embodiment of the present disclosure comprises a luminous element and a pixel circuit connected to the luminous element, wherein the pixel circuit includes a first pixel circuit including a memory storing bit values of multi-bit data corresponding to image data of a single frame and a pulse width modulation (PWM) controller configured to generate a PWM signal based on the bit values and a clock signal that is output in accordance with each bit of the multi-bit data and a second pixel circuit configured to adjust a light-emission time and a non-light-emission time of the luminous element during a single frame in response to the PWM signal.
    Type: Application
    Filed: December 14, 2018
    Publication date: February 18, 2021
    Applicant: SAPIEN SEMICONDUCTORS INC.
    Inventor: Jae Hoon LEE
  • Publication number: 20200160778
    Abstract: The present specification discloses a light-emitting diode (LED) driving apparatus in which a voltage drop phenomenon due to a common impedance is mitigated. In the LED driving apparatus according to the present specification, a circuit is configured by combining N-type metal-oxide-semiconductor (NMOS) transistors or P-type MOS (PMOS) transistors such that a positive power source or a negative power source is not connected to a source terminal of a metal oxide semiconductor field-effect transistor (MOSFET).
    Type: Application
    Filed: November 12, 2019
    Publication date: May 21, 2020
    Applicant: SAPIEN SEMICONDUCTORS INC.
    Inventors: Jae Hoon Lee, Jin Woong Jang