公开(公告)号：US3288985A

公开(公告)日：1966-11-29

申请号：US22119962

申请日：1962-09-04

Applicant: NAT RES DEV

Inventor： RICHARD HOFFMAN GEORGE ,  LUMSDEN JONES PETER

IPC: G11C11/42 ,  H05B33/08

CPC classification number: G11C11/42 ,  H05B33/08 ,  Y02B20/325

Abstract: 977,170. Semipermanent stores. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Sept. 3,1962 [Sept. 5,1961], No. 31926/61. Heading G4A. A matrix of electro-luminescent elements is masked by a card 2, a hole in the card representing a binary arc. To interrogate a particular position of the matrix a row is pulsed at frequency f i and a column at frequency f 2 . The element at the intersection of the row and column will emit light at the difference frequency f 3 , between f 1 and f 2 . The light is received at photo-multiplier 3 if the element is adjacent a hole in the card 2 and is converted to an electrical signal. At filters 4 and 5 the frequencies f 1 and f 2 are rejected and the difference frequency is amplified at circuit 6. At circuits 7 and 8 it is sampled and integrated to produce the data signal.