公开(公告)号：US11205388B2

公开(公告)日：2021-12-21

申请号：US16869482

申请日：2020-05-07

Applicant: Samsung Display Co., Ltd.

Inventor： Ki Ju Im ,  Jong Woo Park ,  Hyun Cheol Hwang

IPC: G09G3/3266

Abstract: A method of operating a display device may include the following steps: in a first frame period, before turning off a gate initialization transistor, changing an initialization voltage from a first level to a second level and subsequently returning the initialization voltage to the first level; in a second frame period, before turning off the gate initialization transistor, changing the initialization voltage from the first level to the second level and/or a third level and subsequently returning the initialization voltage to the first level. The display device may include the gate initialization transistor and a driving transistor. A first electrode the gate initialization transistor may receive the initialization voltage. A second electrode of the gate initialization transistor may be electrically connected to a gate electrode of the driving transistor. The first level, the second level, and the third level may be unequal to each other.

公开(公告)号：US11017719B2

公开(公告)日：2021-05-25

申请号：US16567578

申请日：2019-09-11

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Hyo Jung Kim ,  Tae Young Kim ,  Yong Sung Park ,  Jong Woo Park ,  Mi Seon Seo ,  Keun Soo Lee ,  Ki Ju Im ,  Dae Youn Cho ,  Young Tae Choi ,  Hyun Cheol Hwang

IPC: G09G3/3233 ,  H01L27/32

Abstract: A display device includes a plurality of pixels. Each pixel includes a first transistor that controls an amount of current received from a first power supply voltage line connected via a second node to an organic light emitting diode in response to a voltage of a first node, a second transistor connected between a data line and the second node and that includes a first gate electrode connected to a first scan line, a light emitting line connected to a gate electrode of at least one light emitting transistor located in a current path between the first power supply voltage line and the organic light emitting diode, and a seventh transistor connected between one of at least one second gate electrode of the second transistor and the light emitting line. Accordingly, a threshold voltage of a switching transistor included in each of the plurality of pixels may be negatively shifted.

公开(公告)号：US10854143B2

公开(公告)日：2020-12-01

申请号：US16240515

申请日：2019-01-04

Applicant: Samsung Display Co., Ltd.

Inventor： Dae Youn Cho ,  Tae Young Kim ,  Hee Jin Kim ,  Jong Woo Park ,  Young Tae Choi

IPC: G09G3/3291 ,  G09G3/3266 ,  G09G3/3233 ,  G09G3/3258 ,  H01L27/32

Abstract: An organic light-emitting display device includes a display unit having a plurality of pixel units. The display device also includes a timing controller for calculating a black bias pixel ratio (BBPR) of the display unit based on image signals provided by an external source and for generating a control signal based on the BBPR. The BBPR is the ratio of a number of pixel units in a black state to a total number of pixel units. A power supply unit provides a driving voltage to the display unit based on the control signal from the timing controller, wherein the power supply unit provides a first driving voltage to the display unit when the BBPR is less than a reference value and provides a second driving voltage, which is higher than the first driving voltage, otherwise.

公开(公告)号：US20200243006A1

公开(公告)日：2020-07-30

申请号：US16567578

申请日：2019-09-11

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Hyo Jung KIM ,  Tae Young KIM ,  Yong Sung Park ,  Jong Woo Park ,  Mi Seon SEO ,  Keun Soo LEE ,  Ki Ju IM ,  Dae Youn CHO ,  Young Tae CHOI ,  Hyun Cheol HWANG

IPC: G09G3/3233 ,  H01L27/32

Abstract: A display device includes a plurality of pixels. Each pixel includes a first transistor that controls an amount of current received from a first power supply voltage line connected via a second node to an organic light emitting diode in response to a voltage of a first node, a second transistor connected between a data line and the second node and that includes a first gate electrode connected to a first scan line, a light emitting line connected to a gate electrode of at least one light emitting transistor located in a current path between the first power supply voltage line and the organic light emitting diode, and a seventh transistor connected between one of at least one second gate electrode of the second transistor and the light emitting line. Accordingly, a threshold voltage of a switching transistor included in each of the plurality of pixels may be negatively shifted.