Light emitting display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2022367840-A1
Application number	US-202117564881-A
Country	US
Kind code	A1
Filing date	Dec 29, 2021
Priority date	May 17, 2021
Publication date	Nov 17, 2022
Grant date	—

Abstract

A light emitting display device includes a display panel including a light emitting area and a non-light emitting area; a phase delay layer disposed on the display panel; and a polarizer and an additional polarizer disposed on the phase delay layer. The display panel includes a transistor disposed on a substrate, an organic film overlapping the transistor and including an opening, a first electrode, an emission layer disposed on the first electrode and disposed corresponding to the light emitting area, and a second electrode disposed, the first electrode, the emission layer, and the second electrode form a light emitting diode (LED), the additional polarizer includes a polarization portion overlapping the opening of the organic film in a plan view and a non-polarization portion disposed in a region where the polarization portion is not disposed, and the polarization portion is disposed in a portion of the non-light emitting area.

First claim

What is claimed is:

1 . A light emitting display device comprising:
a display panel including a light emitting area and a non-light emitting area; a phase delay layer disposed on an upper portion of the display panel; and a polarizer and an additional polarizer disposed on an upper portion of the phase delay layer, wherein the display panel includes:
a first transistor disposed on a substrate;
an organic film overlapping the first transistor and including an opening in a plan view;
a first electrode disposed on the organic film;
an emission layer disposed on the first electrode and disposed corresponding to the light emitting area; and
a second electrode disposed on the emission layer,
the first electrode, the emission layer, and the second electrode form a light emitting diode (LED), the additional polarizer includes:
a polarization portion overlapping the opening of the organic film in a plan view; and
a non-polarization portion disposed in a region where the polarization portion is not disposed, and
the polarization portion is disposed in a portion of the non-light emitting area.

2 . The light emitting display device of claim 1 , wherein the first electrode is electrically connected to the first transistor through the opening of the organic film.

3 . The light emitting display device of claim 2 , wherein
the display panel includes:
an opening area in which the opening of the organic film is formed; and
a non-opening area in which the opening of the organic film is not formed, and
the polarization portion overlaps at least part of the opening area in a plan view.

4 . The light emitting display device of claim 3 , wherein the non-opening area includes the light emitting area.

5 . The light emitting display device of claim 3 , wherein the display panel further comprises:
an additional organic film disposed on a lower portion of the organic film and having an opening included in the opening area; and a connecting member disposed in the opening of the additional organic film to electrically connect the first electrode to the first transistor.

6 . The light emitting display device of claim 2 , wherein the first transistor is a driving transistor applying an output current to the light emitting diode (LED).

7 . The light emitting display device of claim 6 , wherein the driving transistor includes a polycrystalline semiconductor.

8 . The light emitting display device of claim 7 , further comprising:
a second transistor transmitting a data voltage to an input-side electrode of the driving transistor; and a third transistor electrically connecting a gate electrode of the driving transistor and an output-side electrode of the driving transistor.

9 . The light emitting display device of claim 8 , wherein
the second transistor includes a polycrystalline semiconductor, and the third transistor includes an oxide semiconductor.

10 . The light emitting display device of claim 1 , wherein
the additional polarizer is disposed on an upper portion of the phase delay layer, and the polarizer is disposed on the additional polarizer.

11 . The light emitting display device of claim 1 , wherein
the polarizer is disposed on an upper portion of the phase delay layer, and the additional polarizer is disposed on the polarizer.

12 . The light emitting display device of claim 1 , wherein
the polarization portion has an island shape, an extended shape extending in a direction, a zigzag shape, or a protruded shape, and the island shape has a polygonal shape, a circular shape, or a quadrangular shape.

13 . The light emitting display device of claim 1 , wherein
the phase delay layer includes a λ/4 plate, and the λ/4 plate has a delay axis intersecting an absorption axis of the polarizer or an absorption axis of the polarization portion at about 45 degrees.

14 . The light emitting display device of claim 1 , wherein
the phase delay layer includes a λ/4 plate and a λ/2 plate, the λ/4 plate has a delay axis intersecting an absorption axis of the polarizer or an absorption axis of the polarization portion at an angle equal to or greater than about 70 degrees and equal to or less than about 80 degrees, and the λ/2 plate has a delay axis intersecting the absorption axis of the polarizer or the absorption axis of the polarization portion at an angle equal to or greater than about 10 degrees and equal to or less than about 20 degrees.

15 . The light emitting display device of claim 1 , wherein the polarizer includes:
a PVA (polyvinyl alcohol) layer in which PVA-based molecular chains are aligned in a direction to have a polarization characteristic; and a triacetyl cellulose (TAC) film disposed on sides of the PVA layer.

16 . The light emitting display device of claim 1 , wherein
the display panel further includes an encapsulation layer overlapping the first transistor and the light emitting diode (LED) in a plan view, and the encapsulation layer includes triple layers formed by sequentially stacking a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer or is made of a glass encapsulation layer.

17 . The light emitting display device of claim 16 , wherein the display panel further includes a touch screen part disposed on an upper portion of the encapsulation layer and sensing a touch.

18 . A method for manufacturing a light emitting display device, comprising:
elongating a polyvinyl alcohol-based material in a direction to form a PVA layer having a polarization characteristic; removing the polarization characteristic from a portion of the PVA layer while not removing the polarization characteristic from a polarization portion; and attaching the polarization portion to a display panel so that the polarization portion corresponds to an opening area of the display panel.

19 . The method of claim 18 , wherein the removing of the polarization characteristic includes:
masking another portion of the PVA layer on which the polarization portion will be formed; and irradiating laser beams on the PVA layer or wiping the PVA layer by use of a solution to remove the polarization characteristic from the portion of the PVA layer.

20 . The method of claim 18 , wherein
the display panel includes an organic film including an opening through which a first electrode of a light emitting diode (LED) is electrically connected to a transistor providing a current to the light emitting diode (LED), and the opening of the organic film is formed in the opening area.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Duk Jin
• Beon Beong-Hun
• Hong Hyo Sung

Classifications

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• H01L51/5293 Primary

  Electricity · mapped topic

• H01L29/78672

  Electricity · mapped topic