The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2008
Filed:
May. 25, 2005
Seong-yeon Hwang, Suwon-si, KR;
Seong-Yeon Hwang, Suwon-si, KR;
Samsung SDI Co. Ltd., Suwon-si, KR;
Abstract
An electron emission display device is capable of focusing electrons emitted from an electron emission region by using small gate holes formed on a thick insulating layer. The electron emission device includes a substrate, a cathode electrode formed on the substrate, a insulating layer formed on the cathode electrode, a gate electrode formed on the insulating layer, and the electron emission region formed on the cathode electrode. In the electron emission device, the insulating layer is provided with a first insulating layer and at least one second insulating layer formed partly on the first insulating layer, and the gate electrode has a stepped portion along a surface of the insulating layer and an inclined portion to connect upper and lower end portions of the stepped portion. As such, with above-structured electron emission device, the inclined portion of the gate electrode formed at the periphery of the gate hole can focus the electrons emitted from the electron emission portion so that the contrast and the coloration are enhanced to realize high definition images without a separate or distinct focusing electrode (e.g., a grid electrode, a grid plate, etc.).