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    PIXEL DRIVING CIRCUIT AND DISPLAY DEVICE
    1.
    发明公开
    PIXEL DRIVING CIRCUIT AND DISPLAY DEVICE 审中-公开

    公开(公告)号：US20240153444A1

    公开(公告)日：2024-05-09

    申请号：US18415191

    申请日：2024-01-17

    Applicant: SAPIEN SEMICONDUCTORS INC.

    Inventor： Jun Young JUNG ,  Myunghee LEE

    IPC: G09G3/32

    CPC classification number: G09G3/32 ,  G09G2300/08 ,  G09G2310/0289 ,  G09G2310/08 ,  G09G2330/021

    Abstract: The present embodiments disclose a pixel. 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 include 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 single frame during a light-emitting period, a second pixel circuit configured to store bit values of image data in a data writing period and generate the control signal based on the bit values and a clock signal, a bias circuit configured to supply a driving power to the first pixel circuit, and a bias controller configured to generate a bias control signal for controlling the bias circuit and output the bias control signal to the bias circuit.

    PIXEL, DISPLAY DEVICE REDUCING STATIC POWER CONSUMPTION AND DRIVING METHOD THEREOF
    5.
    发明公开
    PIXEL, DISPLAY DEVICE REDUCING STATIC POWER CONSUMPTION AND DRIVING METHOD THEREOF 审中-公开

    公开(公告)号：US20230290304A1

    公开(公告)日：2023-09-14

    申请号：US17852942

    申请日：2022-06-29

    Applicant: Sapien Semiconductors Inc.

    Inventor： Ji Han Kim ,  Jin Woong Jang ,  Ji Haeng Lee ,  Dae Young Jung ,  Jong Gu Jeon

    IPC: G09G3/3233

    CPC classification number: G09G3/3233 ,  G09G2300/0857 ,  G09G2300/0852 ,  G09G2310/061 ,  G09G2310/08 ,  G09G2330/021

    Abstract: Provided is a pixel driving circuit capable of reducing power consumed for pixel driving by reducing the number of times a capacitor is charged. The pixel driving circuit includes: a video memory configured to store video data related to driving of a plurality of light-emitting devices; a plurality of sub-pixel driving units, respectively corresponding to the plurality of light-emitting devices, configured to supply power to the plurality of light-emitting devices according to the video data stored in the video memory, each of the plurality of sub-pixel driving units having a capacitor unit for charging power required for driving each of the plurality of light-emitting devices; a charge control memory configured to store data related to charging of the capacitor unit; and a charge controller configured to control whether the capacitor unit is charged according to charge control data stored in the charge control memory.

    DISPLAY BRIGHTNESS CONTROL DEVICE
    6.
    发明公开
    DISPLAY BRIGHTNESS CONTROL DEVICE 审中-公开

    公开(公告)号：US20230144029A1

    公开(公告)日：2023-05-11

    申请号：US17918660

    申请日：2021-05-24

    Applicant: SAPIEN SEMICONDUCTORS INC.

    Inventor： Jae Hoon LEE ,  Sung Qwan OH

    IPC: G09G3/3283 ,  G09G3/325 ,  G06V10/60

    CPC classification number: G09G3/3283 ,  G09G3/325 ,  G06V10/60 ,  G09G2320/0626

    Abstract: Provided is a device for controlling luminance of a display, having a simplified ACL circuit compared to the prior art. The device for controlling luminance of a display calculates the average luminance (Y_avg) when video data is input, and determines the luminance variation (ΔY) according to the average luminance. The device for controlling luminance of a display may adjust the luminance of a display by controlling a current (driving current) that is used to drive a light-emitting diode included in a pixel, instead of modifying video data for the adjustment of luminance. That is, unlike the prior art, the device for controlling luminance of a display does not modify video data, for the control of luminance.

    PIXEL HAVING REDUCED NUMBER OF CONTACT POINTS, AND DIGITAL DRIVING METHOD
    7.
    发明申请
    PIXEL HAVING REDUCED NUMBER OF CONTACT POINTS, AND DIGITAL DRIVING METHOD 有权

    公开(公告)号：US20220406236A1

    公开(公告)日：2022-12-22

    申请号：US17777703

    申请日：2020-11-12

    Applicant: SAPIEN SEMICONDUCTORS INC.

    Inventor： Jae Hoon LEE ,  Jin Woong JANG

    IPC: G09G3/20

    Abstract: Provided are a pixel having two contacting points and an operating method of the pixel. The pixel includes a positive power terminal and a negative power terminal which are related to power required for driving of a pixel driving circuit unit driving a plurality of light-emitting elements, wherein the positive power terminal is connected to a data driving circuit, and the negative power terminal is connected to a scan driving circuit. The pixel may be driven according to a potential difference between a signal output from the data driving circuit and a signal output from the scan driving circuit.

    LED driving apparatus having mitigated common impedance effect
    8.
    发明授权
    LED driving apparatus having mitigated common impedance effect 有权

    公开(公告)号：US11335251B2

    公开(公告)日：2022-05-17

    申请号：US17390085

    申请日：2021-07-30

    Applicant: SAPIEN SEMICONDUCTORS INC.

    Inventor： Jae Hoon Lee ,  Jin Woong Jang

    IPC: G09G3/32 ,  H05B45/325 ,  H05B45/60

    Abstract: An LED driving apparatus includes a driving circuit and multiple pixel circuits, each including: a pixel line connecting pixel power sources; an LED in series to the pixel line; two pixel MOSFETs connected in series to the pixel line, wherein the first MOSFET is turned on by the driving circuit and the second MOSFET is connected to the first MOSFET source; and a capacitor connected between the two MOSFET gates. The driving circuit includes: a driving line connecting driving power sources; a current source in series to the driving line; two driving MOSFETs connected in series to the driving line, wherein the first driving MOSFET is connected to the first pixel MOSFET gate and the second driving MOSFET is connected to the second pixel MOSFET gate and the first driving MOSFET source; and a switch connected between the gates of the first pixel and the first driving MOSFETs.

    LED DRIVING APPARATUS HAVING MITIGATED COMMON IMPEDANCE EFFECT
    9.
    发明申请
    LED DRIVING APPARATUS HAVING MITIGATED COMMON IMPEDANCE EFFECT 有权

    公开(公告)号：US20220036815A1

    公开(公告)日：2022-02-03

    申请号：US17390085

    申请日：2021-07-30

    Applicant: SAPIEN SEMICONDUCTORS INC.

    Inventor： Jae Hoon Lee ,  Jin Woong Jang

    IPC: G09G3/32 ,  H05B45/325

    Abstract: An LED driving apparatus includes a driving circuit and multiple pixel circuits, each including: a pixel line connecting pixel power sources; an LED in series to the pixel line; two pixel MOSFETs connected in series to the pixel line, wherein the first MOSFET is turned on by the driving circuit and the second MOSFET is connected to the first MOSFET source; and a capacitor connected between the two MOSFET gates. The driving circuit includes: a driving line connecting driving power sources; a current source in series to the driving line; two driving MOSFETs connected in series to the driving line, wherein the first driving MOSFET is connected to the first pixel MOSFET gate and the second driving MOSFET is connected to the second pixel MOSFET gate and the first driving MOSFET source; and a switch connected between the gates of the first pixel and the first driving MOSFETs.

    DISPLAY DEVICE AND METHOD FOR CONTROLLING BRIGHTNESS OF SAME
    10.
    发明申请
    DISPLAY DEVICE AND METHOD FOR CONTROLLING BRIGHTNESS OF SAME 有权

    公开(公告)号：US20210233491A1

    公开(公告)日：2021-07-29

    申请号：US17050948

    申请日：2018-08-09

    Applicant: SAPIEN SEMICONDUCTORS INC.

    Inventor： Jae Hoon LEE

    IPC: G09G5/10

    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.

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