Electronics and Telecommunications Research Institute

University-Industry Cooperation Group of Kyung Hee University

SoRa Park

Yoon-Ho Song

Jin-Woo Jeong

Jun Tae Kang

Jae-Woo Kim

Jeong Woong Lee

Eunsol Go

Min-Sik Shin

Ji-Hwan Yeon

HyoungSik Nam

Sunghee Kim

MinChul Suh

Young Chul Choi

Hyo Jin Jeon

Provided is an organic light emitting device. The organic light emitting device may include two light emitting layers. One of the two light emitting layers may emit light in a horizontal driving mode, and the other of the two light emitting layers may emit light in a vertical driving mode.

Organic light emitting device and display apparatus having the same

Provided is a method for driving an X-ray source, which includes a cathode electrode, an electron source provided on the cathode electrode and configured to emit an electron beam, and an anode target including an electron beam irradiation surface with the electron beam irradiated thereto, the method including providing the electron beam in a plurality of main pulses, wherein each of the main pulses includes a plurality of short pulses having an idle time and a pulse time, and each of the idle time and the pulse time is shorter than a duration time of the main pulse, wherein applying the plurality of short pulses comprises irradiating the electron beam from the electron source towards the electron beam irradiation surface during the pulse time; and idling the electron beam during the idle time, wherein a duty cycle of the short pulse is 0.4 to 0.6, which is obtained by dividing the idle time by a sum of the pulse time and the idle time.

Method for driving X-ray source

An electron emission source includes a cathode electrode having a recess region formed in an upper portion thereof and the yarn emitter having a tip shape and provided in the recess region of the cathode electrode. The yarn emitter is spaced from an inner surface of the recess region of the cathode electrode.

Electron emission source and X-ray generator using the same

Disclosed is a field emission apparatus. The apparatus comprises a cathode electrode and an anode electrode spaced apart from each other, an emitter on the cathode electrode, a gate electrode between the cathode and anode electrodes and including at least one gate aperture overlapping the emitter, and an electron transmissive sheet on the gate electrode and including a plurality of fine openings overlapping the gate aperture.

Field emission apparatus

Growing community of inventors

Seoul, South Korea

SoRa Park