Lg Display Co., Ltd.

Yewon Hong

JungHyun Lee

TaeWoong Moon

Yeonwoo Shin

Yeonkyung Kim

JunHyeon Bae

SungSoo Shin

Sohee Choi

Hyun Soo Shin

Junghyun Lee

Sohyung Lee

Hyelim Ji

KwangMin Jo

An electroluminescent display including pixels arranged in a matrix is disclosed. Each pixel includes a pixel circuit configured to sample a threshold voltage of a driving element for driving a light emitting element and compensate for a data voltage. The pixel circuit includes a first switch element connected to a data voltage path supplied with the data voltage, a second switch element connected to a reference voltage path supplied with a predetermined reference voltage, a third switch element connected between a gate of the driving element and the first and second switch elements, a fourth switch element connected to an initialization voltage path supplied with a predetermined initialization voltage, and a fifth switch element connected to a power path supplied with a predetermined pixel driving voltage higher than the reference voltage and the initialization voltage.

Electroluminescent display

A method for manufacturing a display apparatus can include providing a first gate electrode on a substrate; providing a first active layer which overlaps with a portion of the first gate electrode; providing a second active layer on the substrate spaced apart from the first active layer; providing a first source electrode and a first drain electrode connected with the first active layer; providing a second gate electrode which overlaps with at least a portion of the second active layer; providing a second source electrode and a second drain electrode connected with the second active layer. Also, the method includes selectively providing conductivity to the second active layer, in which the first source electrode, the first drain electrode, the second gate electrode, the second source electrode, and the second drain electrode are manufactured at a same time.

Display apparatus comprising different types of thin film transistors with compact design and method for manufacturing the same

A gate driving circuit includes a first type of stage circuit for outputting a first gate signal and a second type of stage circuit for outputting a second gate signal, and further including a bias transistor for supplying, when turned-on, a bias voltage to a shield metal positioned to overlap with a semiconductor layer of a specific transistor among a plurality of transistors included in the first type of stage circuit, thereby preventing a leakage current from occurring inside the gate driving circuit.

Gate driving circuit and display device

Discussed is a display apparatus capable of realizing a high resolution and a small power consumption, and a method for manufacturing the same, wherein the display apparatus includes a bottom gate type first thin film transistor disposed in a display area, and a top gate type second thin film transistor disposed in a non-display area.

One or more embodiments of the present disclosure relate to a display device and a gate driving circuit. There is further provided with a synchronization transistor controlled according to a voltage of a Q node of a m-th scan driver (e.g., a second scan driver) and controlling an electrical connection between an output terminal of the n-th light emitting driver and a clock input terminal of the m-th scan driver, so that the rising characteristic and/or the falling characteristic of the light emission signal which is a type of the gate signal can be improved, thereby improving a threshold voltage compensation performance of the driving transistor and the image quality.

Display device and gate driving circuit having a synchronization transistor

A display apparatus comprises a demultiplexing circuit portion that sequentially supplies data signals supplied from a data driving circuit to at least two data lines, and the demultiplexing circuit portion of the display apparatus comprises a switching portion that sequentially supplies the data signals to the at least two data lines based on a voltage of a control line; a voltage controller that controls the voltage of the control line in response to a time-division control signal; and a voltage discharge portion that discharges the voltage of the control line in response to the time-division control signal.

Display apparatus

Disclosed is a display apparatus and a method for manufacturing the same, wherein the display apparatus comprises a substrate, a light shielding layer, a signal line and a first electrode on the substrate, an active layer, a gate electrode, a second electrode, a first connection electrode for connecting the active layer with the signal line, and a second connection electrode for connecting the active layer with any one of the first electrode and the second electrode, wherein any one of the first electrode and the second electrode is a pixel electrode of a display device, and the other is a common electrode of the display device, the light shielding layer, the signal line and the first electrode are disposed on the same layer, and the first connection electrode and the second connection electrode are formed of the same material as that of the second electrode.

Display apparatus comprising thin film transistor and method for manufacturing the same

A display apparatus comprises a display panel on which a plurality of pixels are displayed, a plurality of signal lines to which a signal required to drive the display panel is supplied, and an electrostatic discharge circuit connected between each of the plurality of signal lines and the electrostatic discharge line. The electrostatic discharge circuit includes first and second current paths between the signal line and the electrostatic discharge line, a first electrostatic discharge circuit connected to the first current path, including a plurality of first thin film transistors having a first gate electrode connected to the second current path and a second gate electrode connected to the first current path, and a second electrostatic discharge circuit connected to the second current path, including at least one second thin film transistor having a first gate electrode connected to the first current path and a second gate electrode connected to the first current path.

A display apparatus includes first to third demultiplexer circuits respectively providing a data signal, supplied from a data driver, to three data lines. Each of the first to third demultiplexer circuits includes a switching unit providing the data signal to a corresponding data line of the three data lines on the basis of a voltage of a corresponding control line of first to third control lines, a voltage controller controlling the voltage of the corresponding control line in response to a corresponding time division control signal of first to third time division control signals and a corresponding auxiliary signal of first to third auxiliary signals which partially overlap the first to third time division control signals respectively, and a voltage discharger discharging the voltage of the corresponding control line.

A display device having a gate driver, which may reduce a leakage current of a TFT and power consumption, is disclosed. Each stage of the gate driver comprises an output portion including a pull-up transistor outputting a corresponding clock of a plurality of clocks as a gate signal in response to control of a Q node, and a pull-down transistor outputting a first gate-off voltage as an off-voltage of a gate signal in response to control of a QB node; a controller charging and discharging the Q node and charging and discharging the QB node to be in an opposite state of the Q node; and a back bias circuit having a back bias node capacitance-coupled with the Q node and generating a second gate-off voltage lower than the first gate-off voltage to apply the second gate-off voltage to the back bias node for an off-period of the Q node, wherein the back bias circuit may apply the back gate bias voltage to light shielding layers of some transistors, which are turned off for the off-period of the Q node, among transistors constituting the output portion and the controller, through the back bias node, thereby reducing or minimizing a leakage current of the corresponding transistors.

Display device having gate driver

Disclosed is a display apparatus and a method for manufacturing the same, wherein the display apparatus comprises a substrate, a light shielding layer and a signal line on the substrate, a buffer layer on the light shielding layer and the signal line, an active layer on the buffer layer, a gate insulating film on the active layer, a gate electrode on the gate insulating film, a protection layer on the gate electrode, a first electrode of a display device on the protection layer, and a connection electrode configured to connect the signal line and the active layer with each other, wherein the light shielding layer and the signal line are disposed on the same layer, and the connection electrode and the first electrode are formed of the same material.

Display apparatus comprising thin film transistor

A display device having a gate driver, which may reduce a leakage current of a TFT and power consumption, is disclosed. Each stage of the gate driver comprises an output portion including a pull-up transistor outputting a corresponding clock of a plurality of clocks as a gate signal in response to control of a Q node, and a pull-down transistor outputting a gate-off voltage as an off-voltage of a gate signal in response to control of a QB node; a controller charging and discharging the Q node and charging and discharging the QB node to be in an opposite state of the Q node; and a back bias circuit having a back bias node capacitance-coupled with the Q node and generating a back gate bias voltage to apply the back gate bias voltage to the back bias node for an off-period of the Q node, wherein the back bias circuit may apply the back gate bias voltage to light shielding layers of some transistors, which are turned off for the off-period of the Q node, among transistors constituting the output portion and the controller, through the back bias node, thereby reducing or minimizing a leakage current of the corresponding transistors.

A demultiplexer for sequentially outputting a data signal to a plurality of data lines disposed in a display panel can include a first switch connected to a first control node, the first switch being configured to electrically connect a first channel with a first data line among the plurality of data lines; a second switch connected to a second control node, the first switch being configured to electrically connect the first channel with a second data line among the plurality of data lines; a third switch connected to a third control node, the third switch being configured to electrically connect a second channel with a third data line among the plurality of data lines; and a fourth switch connected to a fourth control node, the fourth switch being configured to electrically connect the second channel with a fourth data line among the plurality of data lines, in which the first control node and the third control node are configured to receive a single first control signal, and be electrically disconnected from each other at a point in time, the second control node and the fourth control node are configured to receive a single second control signal, and be electrically disconnected from each other at a point in time, and the first control node and the third control node have different voltage conditions than the second control node and the fourth control node.

Display device capable of data output based on demultiplexing

A display apparatus is disclosed, which comprises a demultiplexing circuit portion for sequentially supplying data signals supplied from a data driving circuit to at least two data lines, the demultiplexing circuit portion including a switching portion for sequentially supplying the data signals to at least two data lines based on a voltage of a control line, a voltage controller for controlling the voltage of the control line in response to a time-division control signal and an auxiliary signal partially overlapped with the time-division control signal, and a voltage discharge portion for discharging the voltage of the control line in response to the time-division control signal. Therefore, an off current capable of being transferred to an organic light emitting diode may be prevented from occurring, a bezel area may be minimized, and an image of high resolution of a display panel may be embodied.

Growing community of inventors

Paju-si, South Korea

Yewon Hong