Konkuk University Industrial Cooperation Corp

Samsung Display Co., Ltd.

Samsung Electronics Co., Ltd.

Keechan Park

Minjae Jeong

Chongchul Chai

Kyunghoon Chung

Joonho Lee

Kyungho Kim

Seongho Cho

Jaewon Lee

Gichang Lee

Sunkwun Son

Donghee Shin

Jongbaek Seon

Sangyong No

Sangyeon Kim

Nokyung Park

Seungo Kim

Yikyoung You

A gate driving circuit includes a capacitor connected between a first gate of a pull-down transistor and a control node, and a control transistor connected between the control node and a ground terminal and having a gate connected to the ground terminal.

Transmission gate circuit, inverter circuit and gate driving circuit including the same

A display panel, a pixel circuit, and a display device are disclosed. The display panel includes sub-pixels and a driver driving the sub-pixels. Each sub-pixel includes: an emission element; a first transistor configured to generate a driving current; a constant current control circuit configured to receive a reference voltage and a bias voltage for setting a value of the driving current and including a first capacitor configured to store a first compensation voltage generated by adding a threshold voltage of the first transistor to a difference between the bias voltage and the reference voltage; and a pulse width control circuit configured to receive a data voltage used to determine an emission duration of the emission element and including a second transistor configured to control a pulse width of the driving current according to the data voltage and a second capacitor configured to store a second compensation voltage corresponding to a threshold voltage of the second transistor.

Pixel circuit and display panel with current control

A display panel includes sub-pixels each including a light-emitting element and a pixel circuit including a first transistor and a second transistor; a timing control unit to generate bias data based on first characteristic information of the first transistor, and generate correction data based on second characteristic information of the second transistor; and a data sensing driving unit configured to receive the bias data and the correction data, and output a bias voltage and a grayscale voltage to the pixel circuit. The pixel circuit includes the first transistor to output a driving current to the light-emitting element; a first driving circuit to control a magnitude of the driving current based on the bias voltage; and a second driving circuit including the second transistor and configured to control a pulse width of the driving current based on the grayscale voltage.

Pixel circuit and display panel

Provided are pixel circuits using organic light emitting diodes (OLEDs) and a driving method thereof, and an organic light emitting display including the pixel circuits. The OLED is driven to emit light by a drive transistor generating a drive current compensated with respect to a threshold voltage difference and mobility deviation. The drive transistor may receive reference voltage and data signals in response to separate scan signals supplied to the pixel circuits via different scan lines. As a result, a threshold voltage compensation time, which may include the time during which a reference voltage is supplied to the drive transistor in response to a particular scan signal, may be set long enough regardless of a time during which the data signal is supplied to the pixel circuits located in respective rows of the organic light emitting display in response to a separate scan signal.

Pixel circuit and driving method thereof, and organic light emitting display

Growing community of inventors

Seoul, South Korea

Keechan Park