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.

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.

公开(公告)号：US20210233463A1

公开(公告)日：2021-07-29

申请号：US17155435

申请日：2021-01-22

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Jin Woong Jang

IPC: G09G3/32

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.

公开(公告)号：US12230186B2

公开(公告)日：2025-02-18

申请号：US17916347

申请日：2020-10-22

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Jin Woong Jang

IPC: G09G3/32 ,  G06F1/16 ,  G02B27/01

Abstract: Provided is a pixel driving circuit operatable in a low-definition mode and a high-definition mode using the same pixel memory, and a display device including the same. The pixel driving circuit may include a driving line configured to connect between an emitter and a positive power source or between the emitter and a negative power source, a first transistor connected in series on the driving line and turned on in response to a pulse width modulation (PWM) signal, a first driving unit and a second driving unit that are connected in series on the driving line and electrically connected in parallel to each other, and a second transistor connected between a reference voltage source, which is connected to apply a reference voltage to the first driving unit and the second driving unit, and the second driving unit and turned on or off in response to a display mode selection signal.

公开(公告)号：US11862071B2

公开(公告)日：2024-01-02

申请号：US17890737

申请日：2022-08-18

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Jun Young Jung

IPC: G09G3/32

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

Abstract: The present embodiments disclose a display device. A display device according to an embodiment of the present disclosure comprises a pixel unit including a plurality of pixels, each including a luminous element and a pixel circuit connected to the luminous element, a clock generator configured to generate a plurality of clock signals each corresponding to each of a plurality of subframes constituting a frame, and a parallel to serial converter configured to convert the plurality of clock signals to a serial clock signal and transfer the serial clock signal to the pixel unit, and wherein the pixel circuit of each pixel 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 the plurality of subframes and a second pixel circuit configured to store bit values of image data in the frame and generate the control signal based on the stored bit values and the serial clock signal such that each subframe included in the frame is controlled according to each bit value.

公开(公告)号：US11817041B2

公开(公告)日：2023-11-14

申请号：US17763429

申请日：2020-09-11

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Jin Woong Jang

IPC: G09G3/32

CPC classification number: G09G3/32 ,  G09G2300/0857 ,  G09G2310/08 ,  G09G2320/064 ,  G09G2330/021

Abstract: The present invention is related to pixels and a display apparatus including: a display unit including a plurality of pixels; a signal control unit for generating a first voltage signal and a second voltage signal; a column driver connected to each of the pixels to transmit the first voltage signal to the pixel through a column line; and a row driver connected to each of the pixels to transmit the second voltage signal to the pixel through a row line, wherein the signal control unit generates the second voltage signal so that a voltage level of the second voltage signal rises to be higher than or equal to a predetermined level value during a non-emission period of the pixel.

公开(公告)号：US20230005420A1

公开(公告)日：2023-01-05

申请号：US17942219

申请日：2022-09-12

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Jun Young Jung

IPC: G09G3/32

Abstract: The present embodiments disclose a display device. A display device according to an embodiment of the present disclosure comprises a pixel unit including a plurality of pixels, each including a luminous element and a pixel circuit connected to the luminous element, a clock generator configured to generate a plurality of clock signals each corresponding to each of a plurality of subframes constituting a frame, and a parallel to serial converter configured to convert the plurality of clock signals to a serial clock signal and transfer the serial clock signal to the pixel unit, and wherein the pixel circuit of each pixel 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 the plurality of subframes and a second pixel circuit configured to store bit values of image data in the frame and generate the control signal based on the stored bit values and the serial clock signal such that each subframe included in the frame is controlled according to each bit value.

公开(公告)号：US11170705B2

公开(公告)日：2021-11-09

申请号：US17155435

申请日：2021-01-22

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Jin Woong Jang

IPC: G09G3/32

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.

公开(公告)号：US12112699B2

公开(公告)日：2024-10-08

申请号：US18032461

申请日：2021-12-02

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Ji Han Kim

IPC: G09G3/3233

CPC classification number: G09G3/3233 ,  G09G2310/0286 ,  G09G2310/08

Abstract: The present specification discloses a pixel driving circuit having a reduced number of external contacts. A conventional digital driving pixel requires two contacts (Vcc, GND) related to power, a contact (row signal, column signal) for inputting two signals for digital driving, a contact (mode selection) for inputting a set value required for driving the pixel, and a contact (reset) for maintaining video data for one frame to implement a cycle function during PWM driving and for inputting a reset signal to clear previous video data before inputting new video data. However, the higher the number of contacts, the lower the efficiency of pick & place in the manufacturing process. Thus, in the present specification, a pixel driving circuit is proposed, which can be digitally driven even when the number of contacts is reduced through combination of a row signal and a column signal.

公开(公告)号：US11705059B2

公开(公告)日：2023-07-18

申请号：US17942208

申请日：2022-09-12

Applicant: SAPIEN SEMICONDUCTORS INC.

Inventor： Jae Hoon Lee ,  Jun Young Jung

IPC: G09G3/32

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

Abstract: The present embodiments disclose a display device. A display device according to an embodiment of the present disclosure comprises a pixel unit including a plurality of pixels, each including a luminous element and a pixel circuit connected to the luminous element, a clock generator configured to generate a plurality of clock signals each corresponding to each of a plurality of subframes constituting a frame, and a parallel to serial converter configured to convert the plurality of clock signals to a serial clock signal and transfer the serial clock signal to the pixel unit, and wherein the pixel circuit of each pixel 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 the plurality of subframes and a second pixel circuit configured to store bit values of image data in the frame and generate the control signal based on the stored bit values and the serial clock signal such that each subframe included in the frame is controlled according to each bit value.