(19)

(11)

EP 1 190 455 A2

(12)

(88) Date of publication A3: 17.01.2002 (43) Date of publication: 27.03.2002 Bulletin 2002/13 (21) Application number: 00919823.5 (22) Date of filing: 29.03.2000

(51) International Patent Classification (IPC)7: H01L 31/00 (86) International application number: PCT/US0008/340 (87) International publication number: WO 0060/645 (12.10.2000 Gazette 2000/41)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 01.04.1999 US 283716 (71) Applicant: Koninklijke Philips Electronics N.V. 5621 BA Eindhoven (NL)	(72) Inventors: LIU, Albert, H. San Antonio, TX 78240 (US) VINES, Landon San Antonio, TX 78240 (US) (74) Representative: Duijvestijn, Adrianus Johannes  Internationaal Octrooibureau B.V.,Prof. Holstlaan 6 5656 AA Eindhoven 5656 AA Eindhoven (NL)