Light emitting display device including hydrogen or oxygen absorbing layer

Patent metadata

Field	Value
Publication number	US-11690248-B2
Application number	US-202017137897-A
Country	US
Kind code	B2
Filing date	Dec 30, 2020
Priority date	Dec 31, 2019
Publication date	Jun 27, 2023
Grant date	Jun 27, 2023

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 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 disposed on the anode, and a cathode disposed 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
a hydrogen absorbing layer disposed on the adhesive layer and including a hydrogen absorbing filler,
wherein the bank has a side end disposed more inwardly than side ends of the adhesive layer and the hydrogen absorbing layer, and
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.

2. The light emitting display device of claim 1 , wherein the side end of the hydrogen absorbing layer and the side end of the adhesive layer are collinearly disposed.

3. The light emitting display device of claim 1 , wherein the side end of the bank is disposed closer to the side end of the overcoating layer than a boundary of the light emitting area.

4. The light emitting display device of claim 1 , wherein the side end of the bank is disposed closer to a boundary of the light emitting area than the side end of the overcoating layer.

5. The light emitting display device of claim 1 , wherein the light emitting layer covers an upper surface of the bank, and
wherein the cathode covers an upper surface and a side surface of the light emitting layer and the upper surface of the bank.

6. The light emitting display device of claim 1 , wherein the light emitting layer covers an upper surface of the bank, and
wherein the cathode covers an upper surface and a side surface of the light emitting layer and covers the upper surface and a side surface of the bank.

7. The light emitting display device of claim 1 , further comprising an upper protective layer covering an upper surface of the light emitting element.

8. The light emitting display device of claim 1 , wherein the adhesive layer planarizes the light emitting element and the bank.

9. The light emitting display device of claim 1 , wherein the adhesive layer is in contact with the overcoating layer, the light emitting element and the bank.

10. The light emitting display device of claim 1 , wherein the hydrogen absorbing filler includes one or more of an inorganic material and an organic material,
wherein the inorganic material includes one or more of a metal, a mixture including the metal, and a compound including the metal, and the organic material includes one or more of a hydroxy benzophenone-based compound, a hydroxy phenylbenzotriazole-based compound, and a hindered amines-based compound.

11. The light emitting display device of claim 10 , wherein the metal includes one or more of an alkali metal, an alkaline earth metal, a rare earth metal, a titanium (Ti) group metal, a transition metal, and a post-transition metal.

12. The light emitting display device of claim 10 , wherein the metal includes one or more of thorium (Th), zirconium (Zr), vanadium (V), palladium (Pd), titanium (Ti), magnesium (Mg), nickel (Ni), tin (Sn), platinum (Pt), chromium (Cr), silver (Ag), aluminum (Al), copper (Cu), gold (Au), cobalt (Co) and iron (Fe).

13. The light emitting display device of claim 10 , wherein the mixture includes one or more of lanthanum-nickel (La—Ni), lanthanum-nickel-aluminum (La—Ni—Al), nickel-magnesium (Ni—Mg), iron-titanium (Fe—Ti), and titanium-manganese (Ti—Mn).

14. The light emitting display device of claim 10 , wherein the metal is a plurality of particles having a diameter of several to several tens of nanometers.

15. The light emitting display device of claim 1 , wherein the hydrogen absorbing filler is dispersed in the hydrogen absorbing layer.

16. The light emitting display device of claim 11 , wherein the hydrogen absorbing layer is included in the adhesive layer.

17. The light emitting display device of claim 10 , wherein the hydrogen absorbing filler of the hydrogen absorbing layer is a first hydrogen absorbing filler including the inorganic material, and
wherein the adhesive layer further includes a second hydrogen absorbing filler including the organic material.

18. The light emitting display device of claim 10 , wherein the adhesive layer includes a first adhesive layer and a second adhesive layer disposed on the first adhesive layer,
wherein the hydrogen absorbing filler of the hydrogen absorbing layer is a first hydrogen absorbing filler including the inorganic material, and
wherein the first adhesive layer is formed of a second hydrogen absorbing filler including an adhesive material and the organic material, and the second adhesive layer is formed of an adhesive material.

19. The light emitting display device of claim 1 , wherein the thin film transistor includes a semiconductor layer, and
wherein the semiconductor layer includes an oxide semiconductor or an amorphous semiconductor.

20. The light emitting display device of claim 1 , wherein the anode includes a transparent conductive layer, or a reflective layer and a transparent conductive layer disposed on the reflective layer.

21. The light emitting display device of claim 1 , further comprising a color filter overlaps with the light emitting element and including hydrogen.

22. The light emitting display device of claim 1 , wherein one or more of the hydrogen absorbing layer and the adhesive layer further include an oxygen absorbing filler.

23. The light emitting display device of claim 22 , wherein the oxygen absorbing filler includes an inorganic material including one or more of an antioxidant, carbon nanotube (CNT), and graphene; or an organic material including one or more of silica, zeolite, titania, zirconia, and montmorillonite.

24. The light emitting display device of claim 23 , wherein the oxygen absorbing filler of the organic material is a particle surface-modified with vinyl-based, glycidoxy-based, methacryl-based, amino-based, and mercapto-based silane coupling agents or alkoxide-based, chelating-based, and acylate-based titanium coupling agents.

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