LG DISPLAY CO., LTD. patent applications published on November 30th, 2023

Summary of the patent applications from LG DISPLAY CO., LTD. on November 30th, 2023

LG Display Co., Ltd. has recently filed several patents related to display devices and technologies. These patents aim to improve the performance, functionality, and design of display panels, thin-film transistors, and sound apparatus. Notable applications include organic light emitting display devices, thin film transistor substrates, sound apparatus with piezoelectric devices, and display panels with vibration modules.

Summary: LG Display Co., Ltd. has filed patents for various display devices and technologies. These patents include organic light emitting display devices, thin film transistor substrates, sound apparatus with piezoelectric devices, and display panels with vibration modules. The patents aim to improve the performance, functionality, and design of these devices. Notable applications include the use of oxide semiconductor patterns in driving thin film transistors, the incorporation of multiple switching TFTs with different threshold voltages, and the use of a wavy structure in thin film transistor array substrates to provide stretchable characteristics. The patents also describe pixel circuit designs for display devices, data drivers that can output different white data voltages, and display devices with compensation modes based on driving frequency variation and temperature values. These patents demonstrate LG Display Co., Ltd.'s commitment to innovation and advancement in the field of display technology.

Notable Applications:

• Organic light emitting display devices with oxide semiconductor patterns in driving TFTs
• Thin film transistor substrates with different lengths of conductive part penetration regions
• Sound apparatus utilizing piezoelectric devices and magnets for controlling frequency characteristics
• Display panels with vibration modules consisting of piezoelectric and flexible portions
• Thin film transistor array substrates with wavy structures for stretchable characteristics and prevention of cracks
• Pixel circuit designs for display devices with capacitors, transistors, and emission elements
• Electroluminescent display devices with pixel driving circuits and storage capacitors
• Data drivers capable of outputting different white data voltages
• Display devices with compensation modes based on driving frequency variation and temperature values.

Patent applications for LG DISPLAY CO., LTD. on November 30th, 2023

COVER FILM AND IMAGE DISPLAY DEVICE INCLUDING THE SAME (18203962)

Main Inventor

Harumi OKUNO

Brief explanation

The patent application describes a cover film consisting of a base material layer and a surface layer chemically bonded to it. 

• The surface layer contains a polyurethane resin X1, which includes urethane and urea units as well as a polyorganosiloxane group in its structure.
• The polyurethane resin X1 is formed by reacting a non-yellowing-type isocyanate component B1 with an active hydrogen component A1, which includes a compound a1-1.
• The base material layer consists of a polyurethane resin X2, which contains a urethane bond in its structure.
• The polyurethane resin X2 is formed by reacting a non-yellowing-type isocyanate component B2 with an active hydrogen component A2 that does not include the compound a1-1.
• The base material layer has a specific crosslinking point concentration and elastic recovery rate.

Abstract

Cover film has a base material layer and a surface layer chemically bonded to the base material layer, where the surface layer includes a polyurethane resin X1 containing urethane and urea units and a polyorganosiloxane group in the molecule, the polyurethane resin X1 is a reaction product of a non-yellowing-type isocyanate component B1 with an active hydrogen component A1 including a compound a1-1, the base material layer includes a polyurethane resin X2 having a urethane bond in the molecule, and the polyurethane resin X2 is a reaction product of a non-yellowing-type isocyanate component B2 with an active hydrogen component A2 which does not include the compound a1-1, and has a certain crosslinking point concentration and also has a certain elastic recovery rate.

ANALOG FRONT END AND TOUCH DISPLAY DEVICE (18196495)

Main Inventor

Beom-Jin KIM

Brief explanation

The abstract describes an analog front end for a touch display device that simplifies the wiring structure by using a charge remover and a control signal latching circuit.

• The analog front end includes a charge remover that discharges electric charge from an operational amplifier's input terminal.
• The charge remover uses a switched-capacitor array to perform the discharge.
• A control signal latching circuit is used to latch a received serial signal and generate an individual control signal for the switched-capacitor array.
• The simplified wiring structure reduces complexity and improves the efficiency of the touch display device.

Abstract

An analog front end for a touch display device operates each of two or more charge removers through a simplified wiring structure by providing an analog front end including a charge remover including a switched-capacitor array that discharges electric charge of a first input terminal of an operational amplifier and a control signal latching circuit that latches a received serial signal according to a generated pulse to generate and output an individual control signal of the switched-capacitor array.

Organic Light Emitting Display with Touch Sensor (18200350)

Main Inventor

Eun-Hye LEE

Brief explanation

- The patent application describes an organic light emitting display device with a touch sensor.

- The touch sensor is directly placed on a sealing part, eliminating the need for an additional adhesion process. - This simplifies the manufacturing process and reduces the cost of production. - The display device also includes a display cover electrode made of the same material as the touch sensor's conductive layer. - This prevents damage to the display pad electrode.

Abstract

Disclosed is an organic light emitting display device with a touch sensor. The display device has a touch sensor that is directly disposed on a sealing part, thus removing the necessity of an additional adhesion process, simplifying a manufacturing process and reducing manufacture cost. In addition, the display device with the touch sensor includes a display cover electrode of a display pad that is made of a same material as a conductive layer included in the touch sensor, thus preventing damage to the display pad electrode.

Touch Display Device and Touchscreen Panel (18447644)

Main Inventor

KwangJo Hwang

Brief explanation

The patent application describes a touch display device and touchscreen panel that can maintain high touch sensitivity even when the touch electrodes have different sizes, shapes, or positions.

• The touch display device includes multiple touch electrodes, with the first touch electrode occupying a specific area and consisting of a mesh-shaped electrode metal.
• The device also includes a first dummy metal in the same layer as the first touch electrode, located within the area occupied by the first touch electrode.
• The first dummy metal is electrically disconnected from the first touch electrode.
• This configuration ensures that there is no difference in capacitance among the touch electrodes, allowing for consistent touch sensitivity across the entire touchscreen panel.

Abstract

A touch display device and a touchscreen panel. Even in the case in which touch electrodes have different sizes or shapes or a located in different positions, a difference in capacitance is not formed among the touch electrodes. High touch sensitivity can be obtained. The touch display device comprises a plurality of touch electrodes, wherein a first touch electrode of the plurality of touch electrodes occupies a first area and comprises first mesh-shaped electrode metal. The touch display device comprises first dummy metal in a same layer as the first mesh-shaped electrode metal and in the first area occupied by the first touch electrode, the first dummy metal being electrically disconnected from the first mesh-shaped electrode metal.

Display Device and Display Driving Method (18201437)

Main Inventor

Jeonghyo Park

Brief explanation

The patent application describes a display device with a display panel, data lines, and driving transistors. It also includes a data driving circuit and a timing controller.

• The display device can switch between a first compensation mode and a second compensation mode based on the driving frequency variation.
• In the first compensation mode, the data voltages of the driving transistors in the entire display panel are compensated in real-time during a blank period.
• In the second compensation mode, the data voltages of the driving transistors in at least a partial area of the display panel are compensated based on the temperature value of the display panel.

Abstract

A display device includes a display panel comprising subpixels, data lines, and driving transistors, a data driving circuit configured to convert image data into data voltages and apply the data voltages to the data lines, and a timing the controller configured to control the data driving circuit and switch between a first compensation mode and a second compensation mode responsive to a driving frequency variation of the display device during exceeding a reference value, wherein, in the first compensation mode, the data voltages of the driving transistors in an entire area of the display panel are compensated through a real-time sensing process of characteristic values of the driving transistors during a blank period, and in the second compensation mode, the data voltages of the driving transistors in at least a partial area of the display panel are compensated according to a temperature value of the display panel.

DATA DRIVER AND LED DEVICE INCLUDING THE SAME (18198136)

Main Inventor

Ji Hun KIM

Brief explanation

The patent application describes a data driver that can output different white data voltages.

• The data driver includes channels for outputting white, red, green, and blue data voltages.
• One of the channels can operate in a first driving condition, while both channels can operate together in a second driving condition.

Abstract

A data driver can include a white data voltage output circuit having an Ath channel for outputting a first white data voltage and a Bth channel for outputting a second white data voltage different from the first white data voltage. The data driver can further include red, green, and blue data voltage output circuits configured to output a red data voltage, a green data voltage, and a blue data voltage, respectively. One of the Ath channel and the Bth channel can operate in a first driving condition, and the Ath channel and the Bth channel can operate together in a second driving condition.

ELECTROLUMINESCENT DISPLAY DEVICE AND METHOD OF DRIVING THE SAME (18231576)

Main Inventor

Dong Kyu LEE

Brief explanation

The abstract describes an electroluminescent display device with a pixel driving circuit.

• The device includes a light emitting element and a circuit to drive the element.
• The pixel driving circuit consists of several transistors and a storage capacitor.
• The transistors are connected to different nodes and lines to control the driving current.
• The first transistor is connected to three nodes, while the second and third transistors are connected between nodes.
• The fourth transistor is connected to a driving voltage line and the first node.
• The fifth transistor is connected between the second node and a fourth node.
• The seventh transistor is connected between the fourth node and a reset voltage line.
• The storage capacitor is placed between the first driving voltage line and the third node.

Abstract

An electroluminescent display device can include a light emitting element; and a pixel driving circuit for applying a driving current to the light emitting element, in which the pixel driving circuit includes a first transistor connected to the first, second and third nodes; a second transistor connected between the third node and the second node; a third transistor connected between the first node and a data line; a fourth transistor connected between the first node and a first driving voltage line; a fifth transistor connected between the second node and a fourth node; a seventh transistor connected between the fourth node and a reset voltage line, and a storage capacitor disposed between the first driving voltage line and the third node.

PIXEL CIRCUIT AND DISPLAY APPARATUS COMPRISING PIXEL CIRCUIT (18202064)

Main Inventor

DaeKyu KIM

Brief explanation

The abstract describes a pixel circuit design for display devices.

• The circuit includes a capacitor, transistors, and an emission element.
• The capacitor is connected between two nodes.
• A first transistor connects a data line to one of the nodes.
• A driving transistor has a gate electrode connected to the other node.
• The driving transistor has two electrodes connected to voltage supply lines.
• A second transistor connects the second node to a reference voltage supply line.
• A third transistor connects the reference voltage supply line to another node.
• An emission element is connected to the driving transistor and the third transistor through the other node.

Abstract

A pixel circuit can include a capacitor connected between a first node and a second node, a first transistor connected between a data line and the first node, a driving transistor including a gate electrode connected to the second node, a first electrode connected to a first voltage supply line, and a second electrode connected to a third node, a second transistor connected between the second node and a fourth node, the fourth node being connected to a reference voltage supply line, a third transistor connected between the fourth node and a fifth node, and an emission element connected to the driving transistor and connected to the third transistor through the fifth node.

THIN FILM TRANSISTOR ARRAY SUBSTRATE AND DISPLAY DEVICE (18324103)

Main Inventor

Harkjin KIM

Brief explanation

The present disclosure is about a thin film transistor array substrate and a display device.

• The invention involves a structure with three layers: a first buffer layer made of an organic material, a second buffer layer made of a metal oxide, and a third buffer layer made of an inorganic material.
• Through heat treatment, a wavy structure is formed in this layered structure.
• The wavy structure gives the array substrate stretchable characteristics.
• The wavy structure also prevents cracks from occurring in the third buffer layer.
• Additionally, it prevents the degradation of characteristics of thin film transistors that are placed on the third buffer layer.

Abstract

Embodiments of the present disclosure relate to a thin film transistor array substrate and a display device. Since a wavy structure is formed through heat treatment in a structure in which a first buffer layer made of an organic material, a second buffer layer made of a metal oxide and a third buffer layer made of an inorganic material are stacked, it is possible to provide a display device including an array substrate which has stretchable characteristics through the wavy structure while preventing a crack from occurring in the third buffer layer and preventing characteristics of thin film transistors disposed on the third buffer layer from degrading.

DISPLAY APPARATUS (18234203)

Main Inventor

Chiwan KIM

Brief explanation

The patent application describes a display apparatus that includes a display panel and at least one vibration module on the rear surface of the panel. The vibration module is made up of a piezoelectric composite layer with multiple sub-modules that vibrate the display panel. Each sub-module consists of piezoelectric first portions and flexible second portions arranged in a specific pattern.

• Display apparatus with a vibration module on the rear surface of the display panel
• Vibration module consists of a piezoelectric composite layer with multiple sub-modules
• Each sub-module includes piezoelectric first portions and flexible second portions
• First portions have piezoelectric characteristics, while second portions provide flexibility
• Sub-modules are arranged in a specific pattern
• First portions in sub-modules can be arranged in the same direction or partially in different directions

Abstract

A display apparatus includes: a display panel configured to display an image, and at least one vibration module on a rear surface of the display panel, the at least one vibration module including a piezoelectric composite layer including a plurality of sub-modules configured to vibrate the display panel, each of the plurality of sub-modules including: a plurality of first portions including a piezoelectric characteristic, and a plurality of second portions having flexibility, each of the plurality of second portions being between a respective pair of the plurality first portions, wherein the plurality of first portions in the respective sub-modules are arranged in a same direction or are partially arranged in different directions.

SOUND APPARATUS AND DISPLAY APPARATUS INCLUDING THE SAME (18232005)

Main Inventor

Takayuki SUZUKI

Brief explanation

The abstract describes a sound apparatus that consists of several components, including a piezoelectric device, a vibration member, and two magnets.

• The sound apparatus utilizes a piezoelectric device, which is a material that can convert electrical energy into mechanical vibrations and vice versa.
• The piezoelectric device is connected to a vibration member, which helps in producing sound.
• The apparatus also includes a first magnet that is connected to the piezoelectric device.
• A second magnet is positioned facing the first magnet.
• The purpose of the second magnet is to achieve a desired frequency characteristic, which means it helps in controlling the specific sound frequencies produced by the apparatus.
• The overall design of the sound apparatus allows for easy realization of the desired frequency characteristic.

Abstract

A sound apparatus includes a piezoelectric device, a vibration member connected to the piezoelectric device, a first magnet connected to the piezoelectric device, and a second magnet facing the first magnet, which can readily realize a desired frequency characteristic.

THIN FILM TRANSISTOR SUBSTRATE, METHOD FOR MANUFACTURING THEREOF, AND DISPLAY APPARATUS COMPRISING THE THIN FILM TRANSISTOR SUBSTRATE (18201509)

Main Inventor

JaeHyun KIM

Brief explanation

The patent application describes a thin film transistor substrate with two thin film transistors on a base substrate.

• The first thin film transistor has a first active layer with a channel part that overlaps with a first gate electrode and a first conductive part penetration region.
• The second thin film transistor has a second active layer with a channel part that overlaps with a second gate electrode and a second conductive part penetration region.
• The length of the first conductive part penetration region is longer than the second conductive part penetration region.

Abstract

A thin film transistor substrate includes a first thin film transistor and a second thin film transistor on the base substrate, the first active layer of the first thin film transistor includes a first channel part overlapping with a first gate electrode and a first conductive part penetration region, the second active layer of the second thin film transistor includes the second channel part overlapping with a second gate electrode, a second conductive part penetration region, and a length of the first conductive part penetration region is longer than the second conductive part penetration region.

DISPLAY APPARATUS (18231546)

Main Inventor

Seong-Pil CHO

Brief explanation

The patent application describes a display apparatus that includes two types of thin-film transistors and a light emitting element. 

• The first thin-film transistor has a polysilicon material and includes a gate electrode, two electrodes, and an active layer.
• The second thin-film transistor has an oxide semiconductor and includes a gate electrode, two electrodes, and an active layer.
• The first emitting electrode of the light emitting element is connected to one of the electrodes of the first thin-film transistor.
• The first active layer of the first thin-film transistor is electrically connected to one end of the second active layer of the second thin-film transistor.

Abstract

A display apparatus can include a first thin-film transistor including a first active layer having a first polysilicon material, a first gate electrode overlapping the first active layer, a first electrode and a second electrode; a second thin-film transistor including a second active layer having an oxide semiconductor, a second gate electrode overlapping the second active layer, a third electrode and a fourth electrode; and a first emitting electrode of a light emitting element electrically connected to the second electrode of the first thin-film transistor. Also, one end of the first active layer having the first polysilicon material is electrically connected to one or the other end of the second active layer having the oxide semiconductor.

Thin Film Transistor and Display Device Including the Same (18199001)

Main Inventor

Dongchae Shin

Brief explanation

- The patent application describes an organic light emitting display device that uses an oxide semiconductor pattern in the driving thin film transistor (TFT).

- The driving TFT includes a gate electrode placed under the oxide semiconductor pattern, and a dummy electrode, source electrode, and drain electrode placed over the oxide semiconductor pattern. - The dummy electrode is electrically connected to the source electrode, which increases the S-factor (a measure of transistor performance) of the driving TFT. - The organic light emitting display device also includes multiple switching TFTs with oxide semiconductor patterns. - These switching TFTs have different distances between the oxide semiconductor pattern and the gate electrode, resulting in different threshold voltages. - The purpose of this innovation is to improve the performance and functionality of the organic light emitting display device.

Abstract

Provided is an organic light emitting display device in which a driving thin film transistor (TFT) includes an oxide semiconductor pattern. The driving thin film transistor includes a gate electrode disposed under an oxide semiconductor pattern, and a dummy electrode, a source electrode and a drain electrode over the oxide semiconductor pattern, and the dummy electrode is electrically connected to the source electrode to increase the S-factor of the driving TFT. In addition, the organic light emitting display device of the present disclosure includes a plurality of switching TFTs including an oxide semiconductor pattern, and the plurality of switching TFTs includes a plurality of switching thin film transistors having different distances between the oxide semiconductor pattern and the gate electrode so as to have different threshold voltages.

Organic Light Emitting Display Device (18232798)

Main Inventor

Jungkeun KIM