Polarizing film and display apparatus employing the same

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).