Polarizing film and display apparatus employing the same

Patent metadata

Field	Value
Publication number	US-11221438-B2
Application number	US-201916717974-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Feb 21, 2019
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A polarizing film including a polarizing layer, a reversed wavelength dispersion quarter waveguide (QWP) disposed on the polarizing layer, and a light-absorbing layer disposed on the polarizing layer, in which the light-absorbing layer includes a light absorber to absorb light having a wavelength in a range of about 380 nm to about 430 nm.

First claim

What is claimed is:

1. A polarizing film comprising:
a polarizing layer;
a reversed wavelength dispersion quarter waveplate (QWP) disposed on the polarizing layer; and
a light-absorbing layer disposed on the polarizing layer,
wherein the light-absorbing layer comprises a light absorber to absorb light having a wavelength in a range of about 380 nm to about 430 nm,
wherein the reversed wavelength dispersion QWP satisfies:
DSP (450 nm)= R (450 nm)/ R (550 nm)<1; and
DSP (650 nm)= R (650 nm)/ R (550 nm)>1, and

wherein DSP(λ) denotes a wavelength dispersion value DSP of the reversed wavelength dispersion QWP at a wavelength of λ, R(λ) denotes a phase difference value at a wavelength of λ.

2. The polarizing film of claim 1 , wherein a light transmittance of the polarizing film to light having a wavelength in a range of about 380 nm to about 430 nm is less than 40%.

3. The polarizing film of claim 1 , wherein the light absorber comprises at least one of anthraquinone-based dyes, methine-based dyes, azomethine-based dyes, oxadine-based dyes, azo-based dyes, styryl-based dyes, coumarin-based dyes, porphyrin-based dyes, dibenzofuranone-based dyes, diketopyrrolopyrrole-based dyes, rhodamine-based dyes, kisanten-based dyes, and pyrromethene-based dyes.

4. The polarizing film of claim 1 , wherein the light-absorbing layer comprises at least one of tri-acetyl cellulose (TAC), cyclo olefin polymer, and polymethyl methacrylate (PMMA).

5. The polarizing film of claim 1 , wherein the light-absorbing layer comprises a pressure-sensitive adhesive.

6. The polarizing film of claim 1 , further comprising a first protective layer and a second protective layer respectively disposed on a bottom surface and a top surface of the polarizing layer,
wherein each of the first protective layer and the second protective layer comprises at least one of tri-acetyl cellulose (TAC), cyclo olefin polymer, and polymethyl methacrylate (PMMA).

7. The polarizing film of claim 1 , further comprising an adhesive layer disposed on a bottom surface of the reversed wavelength dispersion QWP.

8. The polarizing film of claim 1 , wherein the polarizing layer comprises a dichroic dye in polyvinyl alcohol (PVA).

9. A polarizing film comprising:
a polarizing layer;
a reversed wavelength dispersion quarter waveplate (QWP) disposed on the polarizing layer; and
a light-absorbing layer disposed on the polarizing layer,
wherein the light-absorbing layer comprises a light absorber to absorb light having a wavelength in a range of about 380 nm to about 430 nm,
wherein a wavelength dispersion value DSP of the reversed wavelength dispersion QWP at a wavelength of 450 nm and a light transmittance of the polarizing film at a wavelength 430 nm satisfy:
T (430 nm)≤8.7875 e (−3.715×DSP(450 nm)) , and

wherein T(430 nm) denotes a light transmittance at a wavelength of 430 nm, DSP denotes a wavelength dispersion value at a wavelength of 450 nm and is R(450 nm)/R(550 nm), and R(λ) denotes a phase difference value at a wavelength of λ.

10. A display apparatus comprising:
a substrate;
a plurality of display elements disposed on the substrate;
a sealing member sealing the plurality of display elements; and
a polarizing film disposed on the sealing member,
wherein the polarizing film comprises:
a polarizing layer;
a reversed wavelength dispersion quarter waveplate (QWP) disposed on the polarizing layer; and
a light-absorbing layer disposed on the polarizing layer,

wherein the light-absorbing layer comprises a light absorber to absorb light having a wavelength in a range of about 380 nm to about 430 nm,
wherein the reversed wavelength dispersion QWP satisfies:
DSP (450 nm)= R (450 nm)/ R (550 nm)<1; and
DSP (650 nm)= R (650 nm)/ R (550 nm)>1, and

wherein DSP(λ) denotes a wavelength dispersion value DSP of the reversed wavelength dispersion QWP at a wavelength of λ, R(λ) denotes a phase difference value at a wavelength of λ.

11. The display apparatus of claim 10 , wherein a wavelength dispersion value DSP of the reversed wavelength dispersion QWP at a wavelength of 450 nm and a light transmittance of the polarizing film at a wavelength 430 nm satisfy:
T (430 nm)≤8.7875 e (−3.715×DSP(450 nm))

wherein T(430 nm) denotes a light transmittance at a wavelength of 430 nm, DSP denotes a wavelength dispersion value at a wavelength of 450 nm and is R(450 nm)/R(550 nm), and R(λ) denotes a phase difference value at a wavelength of λ.

12. The display apparatus of claim 10 , wherein a light transmittance of the polarizing film to light having a wavelength in a range of about 380 nm to about 430 nm is less than 40%.

13. The display apparatus of claim 10 , wherein the light absorber comprises at least one of anthraquinone-based dyes, methine-based dyes, azomethine-based dyes, oxadine-based dyes, azo-based dyes, styryl-based dyes, coumarin-based dyes, porphyrin-based dyes, dibenzofuranone-based dyes, diketopyrrolopyrrole-based dyes, rhodamine-based dyes, kisanten-based dyes, and pyrromethene-based dyes.

14. The display apparatus of claim 10 , wherein:
the light-absorbing layer comprises a pressure-sensitive adhesive; and
the light-absorbing layer is disposed between the reversed wavelength dispersion QWP and the sealing member.

15. The display apparatus of claim 10 , wherein the sealing member comprises a thin-film encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer sequentially stacked one over another.

16. The display apparatus of claim 10 , wherein the sealing member comprises a sealing substrate.

17. The display apparatus of claim 10 , further comprising a first protective layer and a second protective layer respectively disposed on a bottom surface and a top surface of the polarizing layer,
wherein each of the first protective layer and the second protective layer comprises at least one of tri-acetyl cellulose (TAC), cyclo olefin polymer, and polymethyl methacrylate (PMMA).

18. The display apparatus of claim 10 , wherein the light-absorbing layer comprises at least one of tri-acetyl cellulose (TAC), cyclo olefin polymer, and polymethyl methacrylate (PMMA).

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Dukjin
• Jung Woosuk
• Kim Minha

Classifications

• H10K59/8793

  Arrangements for polarized light emission (H10K59/8791 takes precedence) · CPC title

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/873

  Encapsulations · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title