Abstract A thin-film EL display device of red luminescent color having high luminous intensity and high reliability is disclosed. The thin-film EL display device has a first transparent electrode, a first transparent insulating layer, a light-emitting layer of zinc sulfide (ZnS) with the addition of manganese (Mn), a red-light transmitting filter of amorphous silicon (a-Si), a second transparent insulating layer, and a second transparent electrode (second electrode), which are successively deposited one on top of another on a glass substrate. The EL display device produces red light from orange light emission from the light-emitting layer. High temperature resistance of the filter permits the insertion of the filter to a desired position during the fabrication process for the thin-film EL display device. Furthermore, since the filter characteristics of the thin-film EL display do not suffer degradation by the heat generated during the light emitting operation thereof, there is no concern for luminescent color deterioration with time.
Inventors
👤 Yutaka Hattori
👤 Atsushi Mizutani
👤 Nobuei Ito
👤 Tadashi Hattori
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-30 21:37
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A thin-film electroluminescence (EL) display device comprising: an insulating substrate; a first electrode; a first insulating layer; a light-emitting layer for developing a path of light emission; a second insulating layer; a second electrode, said first electrode, said first insulating layer, said light-emitting layer, said second insulating layer and said second electrode being successively formed on said insulating substrate; at least each of said layers lying in said path of light emission being made of a transparent material; a filter layer made of amorphous silicon and being interposed between said light-emitting layer and said second insulating layer for increasing the number of electric charges injected into said light-emitting layer to lower an emission starting voltage.
Claim 2
Dependent Claim
115 words
A thin-film electroluminescence (EL) display device comprising: an insulating substrate; a first electrode; a first insulating layer; a light-emitting layer for developing a path of light emission; a second insulating layer; a second electrode, said first electrode, said first insulating layer, said light-emitting layer, said second insulating layer and said second electrode being successively formed on said insulating substrate; at least each of said layers lying in said path of light emission being made of a transparent material; a filter layer made of amorphous silicon and being interposed between said light-emitting layer and said second insulating layer for increasing the number of electric charges injected into said light-emitting layer to lower an emission starting voltage.
Claim 3
Dependent Claim
20 words
A thin-film EL display device according to claim 1, wherein said filter layer has optical gap of around 1.72 eV.