Organic light emitting diode display and manufacturing method thereof
View Patent ↗An OLED display according to an exemplary embodiment includes: a substrate; an organic light emitting diode formed on the substrate; an overcoat covering the organic light emitting diode; and a patterned metal sheet attached on the overcoat and having a plurality of protrusion and depression portions. A plurality of protrusions may be formed in a bottom surface of the patterned metal sheet where the protrusion and depression portions of the patterned metal sheet and the overcoat face each other.
1. An organic light emitting diode (OLED) display comprising:
a substrate;
an organic light emitting diode on the substrate; and
a thin film encapsulation layer comprising:
an overcoat covering the organic light emitting diode;
a patterned metal sheet on the overcoat and comprising a pattern defined by a plurality of protrusion and depression portions;
a plurality of secondary protrusions on a first surface of the pattern such that the plurality of secondary protrusions faces the overcoat;
an organic sheet having a first surface attached to a second surface of the pattern; and
a flat metal sheet attached to a second surface of the organic sheet.
2. The OLED display of claim 1 , wherein the protrusion and depression portions have alternating convex portions and recess portions.
3. The OLED display of claim 2 , wherein a height of each of the convex portions of the protrusion and depression portions is about 10% to about 100% of the thickness of the patterned metal sheet.
4. The OLED display of claim 1 , further comprising silicon oxide particles on the first surface of the pattern such that the silicon oxide particles face the overcoat.
5. The OLED display of claim 4 , wherein a ratio of the silicon oxide particles with respect to the secondary protrusions is about 1 wt % to about 20 wt %.
6. The OLED display of claim 4 , wherein the patterned metal sheet and the secondary protrusions are formed of the same material.
7. The OLED display of claim 1 , wherein the organic sheet comprises a plurality of organic sheets, and the flat metal sheet comprises a plurality of flat metal sheets, wherein the plurality of organic sheets and the plurality of flat metal sheets are alternately layered.
8. The OLED display of claim 1 , wherein the overcoat and the organic sheet each comprises an organic layer, and an adhesive layer formed on the organic layer.
9. The OLED display of claim 8 , wherein the adhesive layer comprises sequential layers of a first filling adhesive layer, a moisture-absorbing layer, and a second filling adhesive layer.
10. The OLED display of claim 9 , wherein the moisture-absorbing layer comprises at least one moisture-absorbing material selected from the group consisting of silica gel (SiO 2 ∘H 2 O), alumino-silicate beads, montmorillonite, zeolite (Na 12 AlO 3 SiO 2 ∘12H 2 O), activated carbon, alkali metal oxides, alkaline earth metal oxides, metal sulfates, metal halides, and metal perchlorates.
11. The OLED display of claim 9 , wherein the first filling adhesive layer and the second filling adhesive layer are the same or different from each other, and each of the first filling adhesive layer and the second filling adhesive layer comprises at least one filling material selected from the group consisting of talc, silica, magnesium oxide, mica, montmorillonite, alumina, graphite, beryllium oxide, aluminum nitride, silicon carbide, mullite, and silicon.
12. The OLED display of claim 9 , wherein the adhesive layer comprises a thermosetting resin or a photo-curable resin, and each of the first filling adhesive layer, the moisture-absorbing layer, and the second filling adhesive layer comprises a homogeneous thermosetting resin or a photo-curable resin such that the first filling adhesive layer, the moisture-absorbing layer, and the second filling adhesive layer are formed as one sheet without an interlayer interface therebetween.