Field-emission device with improved beams-convergence

Patent metadata

Field	Value
Publication number	US-2016148774-A1
Application number	US-201514929792-A
Country	US
Kind code	A1
Filing date	Nov 2, 2015
Priority date	Nov 21, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

The present disclosure may provide a field emission device with an enhanced beam convergence. For this, the device may include a gate structure disposed between a cathode electrode and an anode electrode, wherein the gate structure includes a gate electrode and an atomic layer sheet disposed on the gate electrode, the gate electrode facing an emitter and having at least one aperture formed therein.

First claim

What is claimed is:

1 . A field emission device comprising:
a cathode electrode; at least one emitter on the cathode electrode; an anode electrode disposed away in a longitudinal direction of the device from the cathode electrode; and a gate structure disposed between the cathode electrode and the anode electrode, wherein the gate structure includes a gate electrode and an atomic layer sheet disposed on the gate electrode, the gate electrode facing the emitter and having at least one aperture formed therein.

2 . The device of claim 1 , wherein the at least one aperture comprises a plurality of apertures, and the at least one emitter comprises a plurality of emitters, wherein the plurality of apertures have a locational correspondence respectively with the plurality of emitters.

3 . The device of claim 2 , wherein the atomic layer sheet is curved in each of the apertures regions.

4 . The device of claim 3 , wherein the curvedness of the atomic layer sheet allows a reduced distortion of a potential distribution between the gate structure and the cathode electrode, and, hence, electrons emitted from the emitters have an enhanced trajectory convergence.

5 . The device of claim 1 , wherein the at least one aperture comprises a plurality of apertures, and the at least one emitter comprises a plurality of emitters, wherein the plurality of apertures have a size-correspondence respectively with the plurality of emitters.

6 . The device of claim 1 , wherein the atomic layer sheet includes a graphene sheet.

7 . The device of claim 1 , wherein the atomic layer sheet allows a reduced distortion of a potential distribution near the gate aperture and between the gate structure and the cathode electrode.

8 . The device of claim 1 , wherein the gate electrode induces an electron emission from the emitter.

9 . The device of claim 1 , wherein the at least one emitter comprises a plurality of emitters, and the aperture is implemented in a single aperture, whose size covers all of the plurality of emitters.

Assignees

• Korea Electronics Telecomm

Inventors

• Park So Ra
• Song Yoon Ho
• Jeong Jin Woo
• Kim Jae Woo
• Shin Min Sik

Classifications

• H01J2203/0232

  characterised by the material · CPC title

• H01J2203/0216

  characterised by the form or structure · CPC title

• H01J29/467

  Control electrodes for flat display tubes, e.g. of the type covered by group H01J31/123 · CPC title

• H01J29/46

  Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement {(transit time tubes H01J23/00, H01J25/00; X-ray tubes H01J35/00; beam tubes for examining ions, e.g. electron or ion microscopes, or processing of objects or materials, e.g. electron or ion beam tubes H01J37/04; electron multipliers H01J43/04; handling of radiation or particles, e.g. focusing, deviating, not otherwise provided for G21K1/00)} · CPC title

• H01J3/021 Primary

  Electron guns using a field emission, photo emission, or secondary emission electron source · CPC title