Samsung Display Co., Ltd.

Kimyeong Eom

Ji-Hyun Ka

Wonkyu Kwak

Haijung In

Kwangsae Lee

Hai-Jung In

Chulkyu Kang

Jihyun Ka

Taehoon Kwon

Hwayoung Song

Nackhyeon Keum

Soongi Kwon

Jinwoo Park

Seungwoo Sung

Minjeong Kim

Dongsoo Kim

Yangwan Kim

Junwon Choi

Jintae Jeong

Min Jeong Kim

Minku Lee

Kyonghwan Oh

Changsoo Pyon

Junghoon Shim

Soon-Gi Kwon

Minkyu Woo

Dong Eup Lee

Chaehan Hyun

Seungji Cha

Sungmin Son

Juhee Hyeon

Jae-jin Song

Jungwoo Lee

ChulKyu Kang

A display apparatus includes a pixel, a first scan driving circuit that transmits a first scan signal to the pixel based on a first gate voltage, a second gate voltage having a level lower than a level of the first gate voltage, and a first clock signal, and a second scan driving circuit that transmits a second scan signal to the pixel based on a third gate voltage having a level different from the level of the first gate voltage, a fourth gate voltage having a level lower than the level of the third gate voltage, and a second clock signal.

Display apparatus

A scan driver includes a stage, wherein the stage includes: a first output controller including a first pull-up transistor and a first pull-down transistor, wherein the first pull-up transistor has a gate connected to a first control node, and the first pull-down transistor has a gate connected to a second control node; a second output controller including a second pull-up transistor and a second pull-down transistor, wherein the second pull-up transistor has a gate connected to the first control node, and the second pull-down transistor has a gate connected to the second control node; and a stabilizer configured to maintain the first control node at an off-voltage level based on the second control node being at an on-voltage level.

Scan driver

According to an embodiment, a scan driver includes a plurality of stages. An output controller of each of the stages includes a pull-down transistor, and the pull-down transistor includes a first gate and a second gate, where the first gate is electrically connected to a third control node or a node electrically connected to the third control node, and the second gate is connected to a third voltage input terminal to which a third voltage of a second voltage level is applied.

Provided is a gate driver comprising an inverter inverting a start signal to generate an inverted start signal, a first driver including a first stage generating a bias gate signal to initialize a light emitting element of each of pixels in response to the inverted start signal, and a second driver including a second stage generating a write gate signal to apply data voltages to the pixels in response to the start signal. Accordingly, the gate driver may generate a plurality of gate signals using one start signal. In addition, since the gate driver generates a write gate signal and a bias gate signal using one start signal, a bias operation and a light emitting element initialization operation may be performed in a self-scan period without adding the start signal. Further, a size of the gate driver may be reduced, and accordingly, the gate driver may be efficiently disposed.

Gate driver and display device having the same

A gate driver includes: a pull-up circuit configured to pull up a gate output signal to a high voltage in response to a signal at a first node of the pull-up circuit; a first pull-down circuit configured to pull down the gate output signal to a low voltage in response to a signal at a second node of the first pull-down circuit; a second pull-down circuit configured to pull down the gate output signal to the low voltage in response to a signal at a third node of the second pull-down circuit; a first selection circuit configured to activate the first pull-down circuit and deactivate the second pull-down circuit based on a first selection signal; and a second selection circuit configured to activate the second pull-down circuit and deactivate the first pull-down circuit based on a second selection signal.

Gate driver including pull-up circuit and pull-down circuit and display apparatus including the same

Provided is a gate driver including a plurality of stages, wherein each stage includes an output unit including a pull-up transistor and a pull-down transistor, and a second node controller configured to control a voltage of a second control node to which a gate of the pull-up transistor is connected, wherein the second node controller includes a first control transistor connected between the first clock terminal and the second control node and including a gate connected to the first control node, and a second control transistor including a gate connected to the gate of the first control transistor and configured to control a short circuit between the first clock terminal and a second clock terminal.

Gate driver and display apparatus including same

A driver includes a stage that includes a first controller, a second controller, and a first output unit. The first controller controls a voltage level of a first node. The second controller controls voltage levels of a second node and a third node to be equal to the voltage level of a first node or an opposite voltage level of the voltage level of the first node, and controls a voltage level of a fifth node to be equal to the opposite voltage level of the voltage level of the first node. The first output unit may output a gate control signal, which has a first voltage when the second node and the third node is in an on-voltage level state, and has a second voltage when the fifth node is in an on-voltage level state.

Emission control driver including a stage that sets a gate control signal at different times to a first voltage and a second voltage

An emission driver includes a plurality of stages. A stage of the plurality of stages receives a start signal, a first clock signal, a second clock signal, a protection signal, a first gate power voltage and a second gate power voltage and outputs an emission signal. The stage of the plurality of stages includes a pull-up switching element connected between a first gate power voltage terminal which receives the first gate power voltage and an emission signal output terminal which outputs the emission signal, a pull-down switching element connected between a second gate power voltage terminal which receives the second gate power voltage and the emission signal output terminal and a protection switching element which applies the first gate power voltage to a control electrode of the pull-down switching element in response to the protection signal.

Emission driver, display apparatus including the same and method of driving display apparatus

A display panel of an OLED display device includes a first pixel configured to emit first color light, a second pixel configured to emit second color light, and a third pixel configured to emit third color light. Each of the first, second and third pixels includes at least two transistors, at least one capacitor and an organic light emitting diode. At least one of at least two transistors or at least one capacitor included in the third pixel has a size different from a size of a corresponding one at least two transistors or at least one capacitor included in the first pixel or the second pixel.

Display panel of an organic light emitting diode display device, and organic light emitting diode display device including pixels that differ in terms of sizes of at least one transistor and/or capacitor

A pixel capable of adjusting a threshold voltage of a driving transistor, the pixel including: a display element configured to emit light during an emission period and including an anode and a cathode, the first transistor including an upper gate and a lower gate and configured to control a magnitude of a driving current flowing to the display element, a storage capacitor connected to the upper gate of the first transistor, and a second transistor configured to be turned on during a data writing period to transmit a data voltage to the first transistor, wherein a lower gate-source voltage of the first transistor has a first voltage level in the data writing period and a second voltage level in the emission period.

Pixel capable of adjusting a threshold voltage of a driving transistor

A display apparatus includes a substrate which includes a first pixel area and a second pixel area. A third pixel area is spaced apart from the second pixel area. A notch peripheral area is adjacent to the first, second and third pixel areas. A plurality of pixels are provided in the first, second and third pixel areas. A first scan line is disposed on the substrate. The first scan line includes a first portion disposed in the second pixel area, a second portion disposed in the third pixel area, and a third portion which connects the first portion to the second portion. The third portion is disposed in the notch peripheral area. A second scan line is disposed on the substrate in the first pixel area. A surface area of the first scan line is from about 90% to about 110% of a surface area of the second scan line.

Display apparatus having a notch

Display panel of an organic light emitting diode display device, and organic light emitting diode display device including pixels differing in terms of size of at least one of a transistor and a capacitor

A display panel test circuit includes a first transistor connected to a first data line and receiving a red lighting test signal, a second transistor connected to the first data line and receiving a blue lighting test signal, a third transistor connected to a second data line and receiving a first green lighting test signal, a fourth transistor connected to a third data line and receiving the red lighting test signal, a fifth transistor connected to the third data line and receiving the blue lighting test signal, a sixth transistor connected to a fourth data line and receiving a second green lighting test signal, a seventh transistor connected to the second data line and receiving a crack test signal, and an eighth transistor connected to the fourth data line and receiving the crack test signal. The display panel test circuit performs one or more tests on a display panel.

Growing community of inventors

Suwon-si, South Korea

Kimyeong Eom