The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Jul. 15, 1999
Applicant:
Inventors:
Runar Törnqvist, Kauniainen, FI;
Tuomas Pitkänen, Helsinki, FI;
Assignee:
Planar Systems Inc., Espoo, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/70 ;
U.S. Cl.
CPC ...
H01J 1/70 ;
Abstract
The present invention concerns an insulating film of a thin film structure deposited on an essentially alkali metal-free glass substrate, comprising alternating layers of aluminium oxide and titanium oxide and thin film electriluminescent device wherein said insulating film is incorporated as an insulating layer between the phosphor layer and the electrode layers. In the insulating film, the ratio between the cumulative thicknesses of said titanium oxide and said aluminium oxide is less than 0.75, and due to the ratio lower than that of prior art, good resistance against cracking of the film is obtained.