公开(公告)号：US11978387B2

公开(公告)日：2024-05-07

申请号：US18221610

申请日：2023-07-13

Applicant: LG Display Co., Ltd.

Inventor： Taehun Kim ,  WooKyu Sang ,  Moonsoo Chung

IPC: G09G3/20 ,  G09G3/3233

CPC classification number: G09G3/2096 ,  G09G3/2007 ,  G09G3/3233 ,  G09G2300/0819 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2310/0262 ,  G09G2310/08 ,  G09G2320/0247 ,  G09G2340/0442

Abstract: A display device can include a light-emitting element, a driving transistor providing a driving current to the light-emitting element using a driving voltage, and a plurality of switching transistors controlling driving of the driving transistor are disposed on a display panel. A gate driving circuit supplies scan signals to the display panel through gate lines. An emission driving circuit supplies a plurality of emission signals to the display panel through a plurality of emission signal lines. A data driving circuit supplies a data voltage to the display panel. A timing controller divides the display panel into a plurality of blocks and controls a level of a bias voltage applied to the driving transistor of a corresponding block among the plurality of blocks according to a grayscale of the data voltage supplied to the corresponding block in a low-speed mode operating at a low-speed driving frequency.

公开(公告)号：US12080228B2

公开(公告)日：2024-09-03

申请号：US18468220

申请日：2023-09-15

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  Moonsoo Chung ,  Taehun Kim

IPC: G09G3/32 ,  H01L27/15 ,  H01L33/60

CPC classification number: G09G3/32 ,  H01L27/156 ,  H01L33/60 ,  G09G2300/0408 ,  G09G2300/0426 ,  G09G2300/0819 ,  G09G2300/0852 ,  G09G2300/0861 ,  G09G2310/0202 ,  G09G2310/08 ,  G09G2320/0233 ,  G09G2320/0252 ,  G09G2320/045

Abstract: A display device includes a pixel circuit connected to a light emitting element. The pixel circuit includes a driving transistor having a gate electrode, a source electrode, and a drain electrode, and a capacitor connected with the gate electrode. The pixel circuit is driven according to a first period when a reference voltage is applied to the gate electrode, a second period when a gate-source voltage difference of the driving transistor is a threshold voltage of the driving transistor, a third period when the reference voltage is applied to the capacitor, and a voltage of the gate electrode varies due to a coupling phenomenon of the capacitor, a fourth period when a high-potential voltage higher than the reference voltage is applied to the source electrode, and a fifth period when the driving transistor is turned on to cause the light emitting element to emit light.

公开(公告)号：US12165590B2

公开(公告)日：2024-12-10

申请号：US18486090

申请日：2023-10-12

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  Moonsoo Chung

IPC: G09G3/3233 ,  G09G3/3266 ,  G09G3/3283

Abstract: Disclosed is an electroluminescent display device using a variable refresh rate (VRR) mode. The purpose of the present disclosure is to reduce the occurrence of a difference in luminance at a time point of a refresh rate change, thereby preventing viewers from perceiving the variation of the refresh rate.

公开(公告)号：US20240038172A1

公开(公告)日：2024-02-01

申请号：US18486090

申请日：2023-10-12

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  Moonsoo Chung

IPC: G09G3/3233

CPC classification number: G09G3/3233 ,  G09G3/3266

Abstract: Disclosed is an electroluminescent display device using a variable refresh rate (VRR) mode. The purpose of the present disclosure is to reduce the occurrence of a difference in luminance at a time point of a refresh rate change, thereby preventing viewers from perceiving the variation of the refresh rate.

公开(公告)号：US20240386841A1

公开(公告)日：2024-11-21

申请号：US18787575

申请日：2024-07-29

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  Moonsoo Chung ,  Taehun Kim

IPC: G09G3/32 ,  H01L27/15 ,  H01L33/60

Abstract: A display device includes a pixel circuit connected to a light emitting element. The pixel circuit includes a driving transistor having a gate electrode, a source electrode, and a drain electrode, and a capacitor connected with the gate electrode. The pixel circuit is driven according to a first period when a reference voltage is applied to the gate electrode, a second period when a gate-source voltage difference of the driving transistor is a threshold voltage of the driving transistor, a third period when the reference voltage is applied to the capacitor, and a voltage of the gate electrode varies due to a coupling phenomenon of the capacitor, a fourth period when a high-potential voltage higher than the reference voltage is applied to the source electrode, and a fifth period when the driving transistor is turned on to cause the light emitting element to emit light.

公开(公告)号：US20240112625A1

公开(公告)日：2024-04-04

申请号：US18468220

申请日：2023-09-15

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  Moonsoo Chung ,  Taehun Kim

IPC: G09G3/32 ,  H01L27/15 ,  H01L33/60

CPC classification number: G09G3/32 ,  H01L27/156 ,  H01L33/60 ,  G09G2300/0408 ,  G09G2300/0426 ,  G09G2300/0819 ,  G09G2300/0852 ,  G09G2300/0861 ,  G09G2310/0202 ,  G09G2310/08 ,  G09G2320/0233 ,  G09G2320/0252 ,  G09G2320/045

Abstract: A display device includes a pixel circuit connected to a light emitting element. The pixel circuit includes a driving transistor having a gate electrode, a source electrode, and a drain electrode, and a capacitor connected with the gate electrode. The pixel circuit is driven according to a first period when a reference voltage is applied to the gate electrode, a second period when a gate-source voltage difference of the driving transistor is a threshold voltage of the driving transistor, a third period when the reference voltage is applied to the capacitor, and a voltage of the gate electrode varies due to a coupling phenomenon of the capacitor, a fourth period when a high-potential voltage higher than the reference voltage is applied to the source electrode, and a fifth period when the driving transistor is turned on to cause the light emitting element to emit light.

公开(公告)号：US11605353B2

公开(公告)日：2023-03-14

申请号：US17401196

申请日：2021-08-12

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  HyoungSik Kim ,  Dongkyu Lee

IPC: G09G3/3275 ,  G09G3/3266 ,  G09G3/3233

Abstract: The present disclosure relates to a display driver and a display device using the same. The display device according to the embodiment improves an effect of preventing leakage current of a data supply transistor by adaptively controlling and supplying, on the basis of a luminance value of an input data, a parking voltage which is applied in order to prevent the leakage current of the data supply transistor. The display driver comprises a controller which provides a clock signal swinging between a high level and a low level during a refresh frame in which a data voltage is written in a pixel, and provides a clock signal having a direct current voltage during a hold frame in which the data voltage written in the pixel is maintained; a data driver which supplies the data voltage to the pixel during the refresh frame in accordance with a data control signal of the controller; and a power supplier which supplies a parking voltage to the pixel during the hold frame.

公开(公告)号：US20220059036A1

公开(公告)日：2022-02-24

申请号：US17401196

申请日：2021-08-12

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  HyoungSik Kim ,  Dongkyu Lee

IPC: G09G3/3275 ,  G09G3/3266 ,  G09G3/3233

Abstract: The present disclosure relates to a display driver and a display device using the same. The display device according to the embodiment improves an effect of preventing leakage current of a data supply transistor by adaptively controlling and supplying, on the basis of a luminance value of an input data, a parking voltage which is applied in order to prevent the leakage current of the data supply transistor. The display driver comprises a controller which provides a clock signal swinging between a high level and a low level during a refresh frame in which a data voltage is written in a pixel, and provides a clock signal having a direct current voltage during a hold frame in which the data voltage written in the pixel is maintained; a data driver which supplies the data voltage to the pixel during the refresh frame in accordance with a data control signal of the controller; and a power supplier which supplies a parking voltage to the pixel during the hold frame.

公开(公告)号：US20250061858A1

公开(公告)日：2025-02-20

申请号：US18934637

申请日：2024-11-01

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  Moonsoo Chung

IPC: G09G3/3233 ,  G09G3/3266 ,  G09G3/3283

Abstract: Disclosed is an electroluminescent display device using a variable refresh rate (VRR) mode. The purpose of the present disclosure is to reduce the occurrence of a difference in luminance at a time point of a refresh rate change, thereby preventing viewers from perceiving the variation of the refresh rate.

公开(公告)号：US11817055B2

公开(公告)日：2023-11-14

申请号：US17944930

申请日：2022-09-14

Applicant: LG Display Co., Ltd.

Inventor： WooKyu Sang ,  Moonsoo Chung

IPC: G09G3/3233 ,  G09G3/3266 ,  G09G3/3283

CPC classification number: G09G3/3233 ,  G09G3/3266 ,  G09G3/3283 ,  G09G2300/0426 ,  G09G2300/0809 ,  G09G2310/0243 ,  G09G2310/08 ,  G09G2320/0233

Abstract: Disclosed is an electroluminescent display device using a variable refresh rate (VRR) mode. The purpose of the present disclosure is to reduce the occurrence of a difference in luminance at a time point of a refresh rate change, thereby preventing viewers from perceiving the variation of the refresh rate.