(19)

(11)

EP 0 913 004 A2

(12)

(43) Date of publication: 06.05.1999 Bulletin 1999/18 (21) Application number: 98907121.0 (22) Date of filing: 23.03.1998

(51) International Patent Classification (IPC):  H01L 27/ 146( . ) H01L 31/ 115( . ) (86) International application number: PCT/IB1998/000422 (87) International publication number: WO 1998/044568 (08.10.1998 Gazette 1998/40)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 02.04.1997 EP 19970200962 (71) Applicant: Koninklijke Philips Electronics N.V. 5621 BA Eindhoven (NL)	(72) Inventors: BRAUERS, Andreas NL-5656 AA Eindhoven (NL) KEMNER, Rudolf NL-5656 AA Eindhoven (NL) SCHIEBEL, Ulrich NL-5656 AA Eindhoven (NL) WIECZOREK, Herfried, Karl NL-5656 AA Eindhoven (NL) (74) Representative: Cohen, Julius Simon  Internationaal Octrooibureau B.V., Prof. Holstlaan 6 5656 AA Eindhoven 5656 AA Eindhoven (NL)