Konkuk University Industrial Cooperation Corp

Samsung Electronics Co., Ltd.

Electronics and Telecommunications Research Institute

Sangyeon Kim

Jong Woo Kim

Seongho Cho

Chi-Sun Hwang

Byoung Gon Yu

Jaewon Lee

Jae-Eun Pi

Min Ki Ryu

Jongbaek Seon

Kee-Chan Park

Sang-Hee Park

Joondong Kim

Keechan Park

OhSang Kwon

Seungo Kim

HongKyun Lym

Yeon Kyung Kim

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

Provided is a single input level shifter. The single input level shifter includes: an input unit applying a power voltage to a first node in response to an input signal and applying the input signal to a second node in response to a reference signal; a bootstrapping unit applying the power voltage to the second node according to a voltage level of the first node; and an output unit applying the input signal to an output terminal in response to the reference signal and applying the power voltage to the output terminal according to the voltage level of the first node, wherein the bootstrapping unit includes a capacitor between the first and second nodes, and when the input signal is shifted from a first voltage level to a second voltage level, the bootstrapping unit raises the voltage level of the first node to a level higher than the power voltage.

Single input level shifter

Growing community of inventors

Seoul, South Korea

Sangyeon Kim