Organic electroluminescent display panel

Abstract

An organic electroluminescent display panel includes a substrate, a plurality of first electrodes forming parallel stripes on the substrate, a plurality of electrical insulating partitions intersecting the first electrodes, an organic electroluminescent layer formed on the first electrodes and the partitions, a plurality of second electrodes located on the organic electroluminescent layer, and a sealing film. The second electrodes form stripes parallel with the partitions. An organic electroluminescent element is formed at each intersection of the first and second electrodes. The sealing film covers exposed portions of the first electrodes, the organic electroluminescent layer, the partitions, and the second electrodes. Each partition has an inverse tapered portion with a widened distal end. The angle θ defined by each tapered surface of the inverse tapered portion and a plane parallel with the substrate is in a range between 50 degrees and 80 degrees, inclusive, and the height H of the partitions is in a range between 1.5 μm and 6.0 μm, inclusive. The sealing film is formed of silicon nitride, and its thickness is in a range between 0.7 μm and 4.0 μm, inclusive.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a partial perspective view illustrating an organic EL display panel according to one embodiment;

FIG. 1B is a partial cross-sectional view illustrating the organic EL display panel shown in FIG. 1A; and

FIGS. 2A to 2C are partial cross-sectional views showing a procedure for manufacturing the organic EL display panel.

Claims

1. An organic electroluminescent display panel comprising: a substrate;a plurality of first electrodes forming parallel stripes on the substrate;a plurality of electrical insulating partitions intersecting the first electrodes;an organic electroluminescent layer formed on the first electrodes and the partitions;a plurality of second electrodes located on the organic electroluminescent layer, the second electrodes forming stripes parallel with the partitions, wherein an organic electroluminescent element is formed at each intersection of the first and second electrodes, the organic electroluminescent elements forming a matrix; anda sealing film covering exposed portions of the first electrodes, the organic electroluminescent layer, the partitions, and the second electrodes,wherein each partition has an inverse tapered portion with a widened distal end, wherein the angle θ defined by each tapered surface of the inverse tapered portion and a plane parallel with the substrate is in a range between 50 degrees and 80 degrees, inclusive, and the height H of the partitions is in a range between 1.5 μm and 6.0 μm, inclusive, andwherein the sealing film is formed of silicon nitride, and its thickness is in a range between 0.7 μm and 4.0 μm, inclusive.

2. The organic electroluminescent display panel according to claim 1, wherein each partition has a base that intersects the first electrodes, each inverse tapered portion being formed on the corresponding base, and the width of the distal end of the inverse tapered portions is smaller than the width of the bases.

3. The organic electroluminescent display panel according to claim 1, wherein the height H of the partitions is in a range between 2 μm and 4.5 μm, inclusive.

4. The organic electroluminescent display panel according to claim 1, wherein the angle θ of the partitions is in a range between 60 degrees and 70 degrees, inclusive.

5. The organic electroluminescent display panel according to claim 1, wherein the thickness of the sealing film is less than or equal to 1.2 μm.