Patents by Inventor Wookyu Sang
Wookyu Sang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11978387Abstract: 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.Type: GrantFiled: July 13, 2023Date of Patent: May 7, 2024Assignee: LG DISPLAY CO., LTD.Inventors: Taehun Kim, WooKyu Sang, Moonsoo Chung
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Publication number: 20240135867Abstract: A display device can include a light emitting element and a pixel circuit including a driving transistor; a first capacitor connected between the driving transistor and a first node; a first transistor connected between the first capacitor and a data line to operate based on a first scan signal; a first light emission transistor connected between the first capacitor and a reference voltage line to operate based on a light emission signal; and a second light emission transistor connected between the driving transistor and a low-potential voltage line to operate based on the light emission signal. The first scan signal sequentially includes a dummy scan signal section and driving scan signal section for turning on the first transistor, and the light emission signal includes a coupling period for turning on the first and second light emission transistors between the dummy scan signal section and the driving scan signal section.Type: ApplicationFiled: September 13, 2023Publication date: April 25, 2024Applicant: LG Display Co., Ltd.Inventors: Taehun KIM, WooKyu SANG, Moonsoo CHUNG
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Publication number: 20240112625Abstract: 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.Type: ApplicationFiled: September 15, 2023Publication date: April 4, 2024Inventors: WooKyu Sang, Moonsoo Chung, Taehun Kim
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Patent number: 11929025Abstract: Disclosed is a display device comprising a light emitting element, and a pixel driving circuit connected to the light emitting element and configured to include first to fourth nodes, wherein the pixel driving circuit includes a driving transistor connected to the first to third nodes, a plurality of switching transistors, a storage capacitor, and a plurality of signals and voltage lines, wherein an initialization voltage applied through an initialization line among the plurality of signals and voltage lines is varied based on a data voltage.Type: GrantFiled: November 4, 2022Date of Patent: March 12, 2024Assignee: LG Display Co., Ltd.Inventors: Dongkyu Lee, Wookyu Sang
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Publication number: 20240078959Abstract: Embodiments of the present disclosure relate to a pixel circuit comprising: a light emitting device which emits light with a luminance corresponding to an amount of driving current applied thereto; a driving transistor which controls the amount of the driving current applied to the light emitting device; a storage capacitor which is connected to the driving transistor; a first transistor which is turned on according to a first scan signal and transmits a data voltage to the storage capacitor; and a second transistor which is turned on according to a second scan signal and diode-connects the driving transistor, wherein the driving transistor and the first transistor are low temperature poly-silicon (LTPS) thin film transistors, and wherein the second transistor is an oxide semiconductor thin film transistor.Type: ApplicationFiled: July 20, 2023Publication date: March 7, 2024Applicant: LG DISPLAY CO., LTD.Inventors: Hyoungsik KIM, Wookyu SANG
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Publication number: 20240038123Abstract: Disclosed is a display device including: a display panel on which a plurality of pixels are arranged to display an image; a gate driver supplying scan signals and emission control signals to the display panel; and a controller driving the pixels by dividing the pixels into a refresh period and a hold period, and the plurality of pixels include an electroluminescent device and a pixel circuit for driving the electroluminescent device, and the pixel circuit includes a driving transistor having a first electrode configured to be applied with a data voltage and a bias voltage, and a second electrode connected to the electroluminescent device.Type: ApplicationFiled: July 20, 2023Publication date: February 1, 2024Applicant: LG DISPLAY CO., LTD.Inventors: Wookyu SANG, Hyungsik KIM, Moonsoo CHUNG, Taehun KIM
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Publication number: 20240038155Abstract: An electroluminescent display device using a variable refresh rate (VRR) mode. The occurrence of a difference in luminance at a time point of a refresh rate change is reduced, thereby preventing viewers from perceiving the change of the refresh rate.Type: ApplicationFiled: October 11, 2023Publication date: February 1, 2024Inventors: Moonsoo Chung, Wookyu Sang
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Publication number: 20240038172Abstract: 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.Type: ApplicationFiled: October 12, 2023Publication date: February 1, 2024Inventors: WooKyu Sang, Moonsoo Chung
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Publication number: 20240029626Abstract: 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.Type: ApplicationFiled: July 13, 2023Publication date: January 25, 2024Applicant: LG Display Co., Ltd.Inventors: Taehun KIM, WooKyu SANG, Moonsoo CHUNG
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Patent number: 11823619Abstract: An electroluminescent display device using a variable refresh rate (VRR) mode. The occurrence of a difference in luminance at a time point of a refresh rate change is reduced, thereby preventing viewers from perceiving the change of the refresh rate.Type: GrantFiled: November 30, 2022Date of Patent: November 21, 2023Assignee: LG Display Co., Ltd.Inventors: Moonsoo Chung, Wookyu Sang
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Patent number: 11817055Abstract: 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.Type: GrantFiled: September 14, 2022Date of Patent: November 14, 2023Assignee: LG Display Co., Ltd.Inventors: WooKyu Sang, Moonsoo Chung
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Publication number: 20230215359Abstract: Disclosed is a display device comprising a light emitting element, and a pixel driving circuit connected to the light emitting element and configured to include first to fourth nodes, wherein the pixel driving circuit includes a driving transistor connected to the first to third nodes, a plurality of switching transistors, a storage capacitor, and a plurality of signals and voltage lines, wherein an initialization voltage applied through an initialization line among the plurality of signals and voltage lines is varied based on a data voltage.Type: ApplicationFiled: November 4, 2022Publication date: July 6, 2023Inventors: Dongkyu LEE, WooKyu SANG
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Publication number: 20230088459Abstract: An electroluminescent display device using a variable refresh rate (VRR) mode. The occurrence of a difference in luminance at a time point of a refresh rate change is reduced, thereby preventing viewers from perceiving the change of the refresh rate.Type: ApplicationFiled: November 30, 2022Publication date: March 23, 2023Inventors: Moonsoo Chung, Wookyu Sang
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Patent number: 11605353Abstract: 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.Type: GrantFiled: August 12, 2021Date of Patent: March 14, 2023Assignee: LG Display Co., Ltd.Inventors: WooKyu Sang, HyoungSik Kim, Dongkyu Lee
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Publication number: 20230005427Abstract: 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.Type: ApplicationFiled: September 14, 2022Publication date: January 5, 2023Inventors: WooKyu Sang, Moonsoo Chung
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Patent number: 11545083Abstract: An electroluminescent display device using a variable refresh rate (VRR) mode. The occurrence of a difference in luminance at a time point of a refresh rate change is reduced, thereby preventing viewers from perceiving the change of the refresh rate.Type: GrantFiled: September 10, 2021Date of Patent: January 3, 2023Assignee: LG Display Co., Ltd.Inventors: Moonsoo Chung, Wookyu Sang
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Patent number: 11468839Abstract: 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.Type: GrantFiled: July 19, 2021Date of Patent: October 11, 2022Assignee: LG Display Co., Ltd.Inventors: WooKyu Sang, Moonsoo Chung
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Publication number: 20220101785Abstract: An electroluminescent display device using a variable refresh rate (VRR) mode. The occurrence of a difference in luminance at a time point of a refresh rate change is reduced, thereby preventing viewers from perceiving the change of the refresh rate.Type: ApplicationFiled: September 10, 2021Publication date: March 31, 2022Inventors: Moonsoo Chung, Wookyu Sang
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Publication number: 20220059030Abstract: 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.Type: ApplicationFiled: July 19, 2021Publication date: February 24, 2022Inventors: WooKyu Sang, Moonsoo Chung
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Publication number: 20220059036Abstract: 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.Type: ApplicationFiled: August 12, 2021Publication date: February 24, 2022Inventors: WooKyu Sang, HyoungSik Kim, Dongkyu Lee