Invalidity dossier
US 6246179
Emissive element and display device using such element
Current assignee: Sanyo Electric Co Ltd
Added 9/23/2026, 2:52:00 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 6,246,179 B1
Title: "Emissive element and display device using such element"
Assignee: Sanyo Electric Co., Ltd. (original assignee; listed current assignee also Sanyo Electric Co., Ltd.)
Inventor: Tsutomu Yamada
Key dates: Priority date 1998-12-01 (JP 10341857A; also JP 30712699A, 1999-10-28); filing date 1999-11-30 (US 09/451,457); granted/published 2001-06-12. Status listed as "Expired - Lifetime" (anticipated expiration 2019-11-30).
Purpose: The patent addresses problems in active-matrix EL (electroluminescence) displays in which a thin-film transistor (TFT) and organic EL element are stacked per pixel. The excerpt identifies: poor coverage of the very thin emissive element layer (generally under 2000 Å) at uneven portions near the periphery of the anode; electric-field concentration at anode edges accelerating emissive-layer deterioration; and emitted light reaching the underlying TFT, increasing leakage current and degrading stability. Stated purposes are to prevent cathode–anode short circuits from emissive-element disconnection caused by anode thickness, reduce deterioration from field concentration at anode edges, and prevent emissive light from reaching the TFT for stable display.
Plain-language scope: The emissive element/display device has an emissive region formed by laminating a first electrode, an emissive element layer, and a second electrode. An insulating film is disposed on at least a peripheral portion of the first electrode to separate it from the emissive element layer and/or the second electrode. In the display device, each pixel has such an emissive element; the first electrode is separately formed per pixel, with its peripheral portion covered by the insulating film. The insulating film is disposed between the first electrode and the emissive element layer and overlaps the first electrode along the entire peripheral portion outlining it.
Source: https://patents.google.com/patent/US6246179/en
Not established by this excerpt: the full claim set and their exact scope; the complete specification, drawings, and omitted text; the cited prior art; and any litigation, ownership transfers, validity, or legal-status conclusions (the source itself notes legal status is an assumption, not a legal conclusion).
Generated 10/1/2026, 9:51:53 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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