(19)

(11)

EP 0 331 724 A1

(12)

(43) Date of publication: 13.09.1989 Bulletin 1989/37 (21) Application number: 88909160.0 (22) Date of filing: 30.08.1988

(51) International Patent Classification (IPC):  G02F 1/ 1335( . ) G02F 1/ 135( . ) (86) International application number: PCT/US1988/003100 (87) International publication number: WO 1989/002613 (23.03.1989 Gazette 1989/07)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 14.09.1987 US 19870095806 (71) Applicant: Hughes Aircraft Company Los Angeles California 90045-0066 (US)	(72) Inventors: EFRON, Uzi Los Angeles, CA 90064 (US) BRAATZ, Paul, O. Canoga Park, CA 91307 (US) GRINBERG, Jan Los Angeles, CA 90049 (US) (74) Representative: KUHNEN, WACKER & PARTNER  Alois-Steinecker-Strasse 22 D-85354 Freising D-85354 Freising (DE)