Organic electroluminescenst display panel and manufacturing method therefor
a technology of electroluminescent elements and display panels, which is applied in the direction of electroluminescent light sources, electric lighting sources, solid-state devices, etc., can solve the problems of deterioration of luminescent properties, affecting the appearance and appearance of the display panel, so as to achieve excellent shielding effect against oxygen and degradation-resistant luminescent properties
Inactive Publication Date: 2006-11-30
PIONEER CORP
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Benefits of technology
The multi-layered film structure effectively shields the organic electroluminescent elements from oxygen and water, preventing degradation and the spread of dark spots, thereby maintaining luminescent properties and enhancing the durability of the organic electroluminescent display panels.
Problems solved by technology
In particular, the properties of the interface between the electrode of the organic EL element and the organic functional layer deteriorate markedly, and the luminescent properties, such as brightness and color, also deteriorate.
However, such a protective film does not have sufficient barrier properties.
That is, it is impossible to avoid the generation of pinholes in the inorganic barrier film.
Method used
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Embodiment Construction
[0041] The inventor conducted experiments on a two-layer sealed construction comprising a high-molecular compound film in contact with an organic EL element and an inorganic barrier film formed thereon, because only an inorganic barrier film cannot seal an organic EL element sufficiently.
[0042] In the experiments, a high-molecular compound film of photo-setting epoxy resin was used. When the resultant organic EL element was kept under a high temperature, then the high-molecular compound film generated outgas from photo-polymerization initiator residue in the resin or a by-product or the like contributed to the reaction. Such outgas attacked the organic EL element itself to cause the spread of the dark spot and the luminance deterioration. The inventor suggests to make a multi-layered film for a protective film in which an inorganic barrier film such as silicon nitride, a high-molecular compound film, another inorganic barrier film, another high-molecular compound film is layered in...
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An organic electroluminescent display panel includes: one or more organic electroluminescent elements each having first and second display electrodes and one or more organic functional layers of organic compounds sandwiched and layered between the first and second display electrodes, the organic functional layers including a light-emitting layer; and a substrate supporting the organic electroluminescent elements. The display panel also includes: a first inorganic barrier film covering the organic electroluminescent elements and a surface of the substrate around the one or more organic electroluminescent elements; a first high-molecular compound film having an area larger than each of the organic electroluminescent elements so as to partially cover the first inorganic barrier film thereover; and a second inorganic barrier film covering the first high-molecular compound film and an edge thereof.
Description
[0001] This is a divisional of application Ser. No. 10 / 394,509 filed Mar. 24, 2003. The entire disclosure of the prior application, application Ser. No. 10 / 394,509 is considered part of the disclosure of the accompanying divisional application and is hereby incorporated by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an organic electroluminescent element (hereinafter referred to as an organic EL element) comprising one or more organic thin films (hereinafter referred to as an organic functional layer) including a light-emitting layer consisting of organic compound material which exhibits electroluminescence when electrical current is injected thereto. More particularly, the present invention relates to an electroluminescent display panel (hereinafter referred to as organic EL display panel) with one or more organic EL elements formed on a substrate. [0004] 2. Description of the Related Art [0005] The organic EL elemen...
Claims
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IPC IPC(8): H01L21/4763H05B33/04H01L51/50H01L51/52H05B33/10
CPCH01L51/5237H10K59/8731H10K50/8445
Inventor KUBOTA, HIROFUMI
Owner PIONEER CORP