| US 7,489,070 B2 | ||
| Field emission device and field emission display using the same having a concave-shaped cathode to enhance electron focusing | ||
| Young-Jun Park, Suwon-si (Korea, Republic of); and Tae-Won Jeong, Seoul (Korea, Republic of) | ||
| Assigned to Samsung SDI Co., Ltd., Suwon-si, Gyeonggi-do (Korea, Republic of) | ||
| Filed on Aug. 02, 2005, as Appl. No. 11/194,559. | ||
| Claims priority of application No. 10-2004-0061422 (KR), filed on Aug. 04, 2004. | ||
| Prior Publication US 2006/0028111 A1, Feb. 09, 2006 | ||
| Int. Cl. H01J 1/62 (2006.01); H01J 63/04 (2006.01) | ||
| U.S. Cl. 313—495 [313/310; 313/497] | 24 Claims |
| 1. A field emission device, comprising:
a substrate;
a first cathode electrode arranged on the substrate;
a first insulating layer arranged on the substrate and on the first cathode electrode and including a concave aperture having
a concave-shaped sidewall profile, the concave aperture exposing an exposed portion of the first cathode electrode;
a second cathode electrode arranged on the first insulating layer and within the concave aperture of the first insulating
layer and being electrically connected to the first cathode electrode;
a plurality of electron emitters arranged on the exposed portion of the first cathode electrode;
a gate insulating layer arranged on the second cathode electrode and including an aperture exposing the concave aperture in
the first insulating layer; and
a gate electrode arranged on the gate insulating layer and including an aperture aligned with the aperture in the gate insulating
layer.
|