Light emitting display device including hydrogen or oxygen absorbing layer

Patent metadata

Field	Value
Publication number	US-12349581-B2
Application number	US-202318197406-A
Country	US
Kind code	B2
Filing date	May 15, 2023
Priority date	Dec 31, 2019
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

A light emitting display device includes a lower substrate, a thin film transistor on the lower substrate, a passivation layer disposed on the thin film transistor and including hydrogen, an overcoating layer disposed on the passivation layer and planarizing the passivation layer, a light emitting element disposed on the overcoating layer and including an anode, a light emitting layer on the anode, and a cathode on the light emitting layer, a bank disposed on the overcoating layer and defining a light emitting area, an adhesive layer on the light emitting element and the bank, and a hydrogen absorbing layer disposed on the adhesive layer and including a hydrogen absorbing filler, wherein a side end of the bank is disposed more inwardly than side ends of the adhesive layer and the hydrogen absorbing layer, wherein the side ends of the adhesive layer and the hydrogen absorbing layer are disposed more inwardly than a side end of the overcoating layer.

First claim

What is claimed is:

1. A light emitting display device, comprising:
a lower substrate;
a thin film transistor disposed on the lower substrate;
a passivation layer disposed on the thin film transistor;
an overcoating layer disposed on the passivation layer and planarizing the passivation layer;
a light emitting element disposed on the overcoating layer and including an anode, a light emitting layer on the anode, and a cathode on the light emitting layer;
a bank disposed on the overcoating layer and defining a light emitting area; and
an adhesive layer disposed on the light emitting element and the bank and including a hydrogen absorbing filler or an oxygen absorbing filler,
wherein the adhesive layer includes a first adhesive layer disposed on the passivation layer and a second adhesive layer disposed on the first adhesive layer,
wherein the first adhesive layer includes a curable resin and one or more of the hydrogen absorbing filler and the oxygen absorbing filler,
wherein the second adhesive layer includes a curable resin, and
wherein the first adhesive layer covers an upper surface and a side surface of the bank and the cathode.

2. The light emitting display device of claim 1 , wherein the hydrogen absorbing filler includes one or more of a hydroxy benzophenone-based compound, a hydroxy phenylbenzotriazole-based compound, and a hindered amines-based compound.

3. The light emitting display device of claim 1 , wherein the oxygen absorbing filler includes an organic material including one or more of an antioxidant, carbon nanotube (CNT), and graphene or an inorganic material including one or more of silica, zeolite, titania, zirconia, and montmorillonite.

4. The light emitting display device of claim 1 , wherein the curable resin of the first adhesive layer includes one or more of polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene vinyl alcohol (EVOH), polyacrylonitrile (PAN) and polychlorotrifluoroethylene (PCTFE).

5. A light emitting display device comprising:
a lower substrate;
a thin film transistor disposed on the lower substrate;
a passivation layer disposed on the thin film transistor;
an overcoating layer disposed on the passivation layer and planarizing the passivation layer;
a light emitting element disposed on the overcoating layer and including an anode, a light emitting layer on the anode, and a cathode on the light emitting layer;
a bank disposed on the overcoating layer and defining a light emitting area;
an adhesive layer disposed on the light emitting element and the bank and including a hydrogen absorbing filler or an oxygen absorbing filler; and
a hydrogen absorbing layer disposed on the adhesive layer and including a hydrogen absorbing filler of an inorganic material including one or more of a metal, a mixture including the metal, and a compound including the metal.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Yeon
• Kim Goeun
• Seo Hyeontae
• Kim Eunjin
• Kim Jungyeon
• Kim Jinho
• Kim Tae-Hoon
• Kim Kyounghoon
• Lee Kwangseon
• Shin Hongdae

Classifications

• H10K50/8426

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10K50/844

  Encapsulations · CPC title

• H10K50/818

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title

• H10K50/865

  comprising light absorbing layers, e.g. light-blocking layers · CPC title

• H10K50/84

  Passivation; Containers; Encapsulations · CPC title