Lg Display Co., Ltd.

Yeonkyung Kim

TaeWoong Moon

JungHyun Lee

Yewon Hong

JunHyeon Bae

Yeonwoo Shin

YongSeok Park

Hyelim Ji

A display panel and a display device having an emission control driver are discussed. The display device can include a display panel to display an image through sub pixels, a scan driver to supply a second scan signal to each of second gate lines, and an emission control driver to supply an emission control signal to each of third gate lines and supply a first scan signal to each of first gate lines. Each emission control stage of the emission control driver can include an output buffer. The output buffer can output an emission control signal to an output line and output a first scan signal to a scan output line under control of a first control node, and output a high potential power supply voltage to the output line and output a low potential power supply voltage to the scan output line under control of a second control node.

Display panel and display device having emission control driver

A display panel and a display device having an emission control driver are discussed. The display device can include a display panel for displaying an image through sub pixels, and an emission control driver configured to supply a plurality of emission control signals to the sub pixels. The emission control driver can include a plurality of emission control stages configured to supply the plurality of emission control signals, respectively. Each emission control stage can include an output buffer including a first pull-up transistor configured to output a first high potential power supply voltage to an output line by a Q node, and a first pull-down transistor configured to output a first low potential power supply voltage to the output line by a QB node.

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.

Display apparatus

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

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.

The present disclosure relates to a gate driving circuit and a display device using the circuit. A gate driving circuit according to an aspect of the present disclosure comprises a Q node controller, a QB node controller, and an output unit generating a pulse-type output signal by controlling charging and discharging of an output terminal according to the voltages of the Q node and the QB node, and the QB node controller controls the voltage of the QB node in an alternating manner during a non-scan period in which the Q node controller outputs a low level voltage for the Q node.

Gate driving circuit and display device using the same

Disclosed is a display apparatus including a gate driving circuit, which stably holds an output signal during a touch sensing period. The display apparatus includes a display panel including a display area including a plurality of gate lines, a plurality of data lines, and a plurality of touch sensors, a gate driving circuit dividing the display area into a plurality of horizontal blocks and driving gate lines of a horizontal block by units of horizontal blocks at every display period in one frame, and a touch driving circuit sensing a touch through touch sensors of the horizontal block by units of horizontal blocks at every touch sensing period in the one frame. The gate driving circuit includes a plurality of driving stage groups each including a plurality of driving stages supplying a scan pulse to gate lines included in a corresponding horizontal block at every display period and a plurality of holding stage groups each including at least one holding stage supplying a carry signal to a rear driving stage group according to a voltage of a first control node and a voltage of a second control node based on first and second node control powers and an output signal supplied from a front driving stage group, the plurality of holding stages being disposed between the plurality of driving stage groups. Each of the first and second node control powers includes an alternating current (AC) voltage.

A display apparatus includes a display panel including a display area including a plurality of gate lines, a plurality of data lines, and a plurality of touch sensors, a gate driving circuit dividing the display area into a plurality of horizontal blocks and driving gate lines of a horizontal block by units of horizontal blocks at every display period in one frame, and a touch driving circuit sensing a touch through touch sensors of the horizontal block by units of horizontal blocks at every touch sensing period in the one frame.

A gate drive circuit and a display device are provided. The gate drive circuit comprises: a first stage that outputs a first gate pulse at a first output terminal by increasing a voltage at the first output terminal when a first Q node is charged in response to receiving a first carry signal at a first start terminal, and decreasing the voltage at the first output terminal when a first QB node is charged; and a second stage that outputs a second gate pulse at a second output terminal and outputs a second carry signal at a third output terminal by increasing voltages at the second and third output terminals when a second Q node is charged in response to receiving the first carry signal at a second start terminal, and decreasing the voltages at the second and third output terminals when a second QB node is charged.

Gate drive circuit and display device using the same

A gate driver and a display device having an in-cell touch sensor using the gate driver are disclosed. The gate driver includes a shift register configured to sequentially supply gate pulses to gate lines of a display panel. The shift register includes an (N&#x2212;1)th stage, where N is a positive integer equal to or greater than 2, configured to output an (N&#x2212;1)th gate pulse, an Nth stage configured to output an Nth gate pulse, and a hold circuit configured to hold an output voltage of the (N&#x2212;1)th stage during a predetermined time and supply the output voltage to the Nth stage.

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Paju-si, South Korea

Yeonkyung Kim