Optical filter, and camera module and electronic device comprising the same

Patent metadata

Field	Value
Publication number	US-11719867-B2
Application number	US-202117489020-A
Country	US
Kind code	B2
Filing date	Sep 29, 2021
Priority date	Nov 1, 2017
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

Disclosed are an optical filter including a near infrared absorption layer on a polymer film. The polymer film has a* of about −5.0 to about +5.0 and b* of about −5.0 to about +5.0 in a color coordinate expressed by a CIE Lab color space. The near infrared absorption layer may be configured to transmit light in a visible region and to selectively absorb at least one part of light in a near infrared region. The near infrared absorption layer includes a first near infrared absorption material including a copper phosphate ester compound and a second near infrared absorption material including at least two different organic dyes. The second near infrared absorption material has a maximum absorption wavelength (λmax) in a wavelength region of about 650 nm to about 1200 nm. An electronic device may include the optical filter.

First claim

What is claimed is:

1. An optical filter, comprising
a polymer film having a* of about −5.0 to about +5.0 and b* of about −5.0 to about +5.0, based on a color coordinate expressed by a CIE Lab color space; and
a near infrared absorption layer on the polymer film, the near infrared absorption layer being configured to transmit light in a visible region and to selectively absorb at least one part of light in a near infrared region,
the near infrared absorption layer including a first near infrared absorption material and a second near infrared absorption material,
the first near infrared absorption material including a copper phosphate ester compound represented by Chemical Formula 4:

wherein, in Chemical Formula 4,
R 41 and R 42 are independently one of a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C20 alkynyl group, or a substituted or unsubstituted C6 to C20 aryl group,
n 1 is an integer of 0 or 1, and
n 2 is an integer of 1 or 2,
the second near infrared absorption material including at least two different organic dyes, and
the second near infrared absorption material having a maximum absorption wavelength (λ max ) in a wavelength region of about 650 nm to about 1200 nm.

2. The optical filter of claim 1 , wherein
a thickness of the optical filter is greater than or equal to about 20 μm and less than or equal to about 250 μm, and
the optical filter has an average light transmittance of less than or equal to about 25% in a wavelength region of about 700 nm to about 1200 nm.

3. The optical filter of claim 1 , wherein
a thickness of the optical filter is greater than or equal to about 20 μm and less than or equal to about 250 μm,
the optical filter has an average light transmittance of less than or equal to about 5% in a wavelength region of about 700 nm to about 740 nm, and
the optical filter has an average light transmittance of less than or equal to about 25% in a wavelength region of about 1000 nm to about 1200 nm.

4. The optical filter of claim 1 , wherein
a thickness of the optical filter is greater than or equal to about 20 μm and less than or equal to about 250 μm, and
the optical filter has an average light transmittance of greater than or equal to about 80% in a wavelength region of about 430 nm to about 565 nm.

5. The optical filter of claim 1 , wherein
the second near infrared absorption material includes a binder,
the at least two different organic dyes of the second near infrared absorption material include an organic dye represented by Chemical Formula 1 and at least one of an organic dye represented by Chemical Formula 2 or an organic dye represented by Chemical Formula 3:

wherein, in Chemical Formula 1, Chemical Formula 2, and Chemical Formula 3,
R 1 to R 26 are independently a hydrogen atom, a substituted or unsubstituted C1 to C20 alkyl group, or a substituted or unsubstituted C6 to C20 aryl group,
X is one of PF 6 − , BF 4 − , ClO 4 − , I − , or a borate-based anion, and
n is an integer ranging from 1 to 10.

6. The optical filter of claim 5 , wherein the organic dye represented by Chemical Formula 1 includes one or more structures represented by at least one of Chemical Formula 1a, Chemical Formula 1b, Chemical Formula 1c, Chemical Formula 1d, or Chemical Formula 1e:

7. The optical filter of claim 5 , wherein the organic dye represented by Chemical Formula 2 includes one or more structures represented by at least one of Chemical Formula 2a, Chemical Formula 2b, or Chemical Formula 2c:

8. The optical filter of claim 5 , wherein
the organic dye represented by Chemical Formula 1 has a maximum absorption wavelength (λ max ) in a wavelength region of about 700 nm to about 760 nm,
the organic dye represented by Chemical Formula 2 has a maximum absorption wavelength (λ max ) in a wavelength region of about 1050 nm to about 1100 nm, and
the organic dye represented by Chemical Formula 3 has a maximum absorption wavelength (λ max ) in a wavelength region of about 680 nm to about 720 nm.

9. The optical filter of claim 5 , wherein the binder includes an acrylic binder, an epoxy binder, or a combination thereof.

10. The optical filter of claim 5 , wherein
the organic dye represented by Chemical Formula 1 has an absorbance at a maximum absorption wavelength (λ max ) that is at least about 30 times as high as an absorbance of the organic dye represented by Chemical Formula 1 at a wavelength of about 550 nm, and
the organic dye represented by Chemical Formula 2 has an absorbance at a maximum absorption wavelength (λ max ) that is at least about 15 times as high as an absorbance of the organic dye represented by Chemical Formula 2 at a wavelength of about 550 nm.

11. The optical filter of claim 1 , wherein the copper phosphate ester compound represented by Chemical Formula 4 includes one or more structures represented by at least one of Chemical Formula 4a, Chemical Formula 4b, Chemical Formula 4c, or Chemical Formula 4d:

12. The optical filter of claim 1 , wherein
the near infrared absorption layer includes a first near infrared absorption layer and a second near infrared absorption layer,
the first near infrared absorption layer consisting of the first near infrared absorption material,
the second near infrared absorption layer consisting of the second near infrared absorption material, and
the first near infrared absorption layer and the second near infrared absorption layer are separate layers from each other.

13. The optical filter of claim 12 , wherein the first near infrared absorption layer is on the polymer film and the second near infrared absorption layer is on the first near infrared absorption layer.

14. The optical filter of claim 1 , wherein the optical filter further includes an anti-reflection layer on at least one of one surface of the polymer film or one surface of the near infrared absorption layer.

15. The optical filter of claim 14 , wherein
the anti-reflection layer includes a first layer and a second layer,
a refractive index of the first layer is different than a refractive index of the second layer, and
the first layer and the second layer are alternately stacked two or more.

16. The optical filter of claim 14 , wherein the optical filter includes an anti-reflection layer on the one surface of the polymer film and the one surface of the near infrared absorption layer, respectively.

17. The optical filter of claim 1 , wherein the polymer film includes one of polyethyleneterephthalate, polyethylenenaphthalate, triacetyl cellulose, polycarbonate, a cycloolefin polymer, poly(meth)acrylate, polyimide, or a combination thereof.

18. The optical filter of claim 1 , wherein a yellow index of the polymer film measured according to ASTM D1925 is less than or equal to about 10.

19. The optical filter of claim 1 , wherein a haze of the polymer film is less than or equal to

Assignees

• Samsung Electronics Co Ltd

Inventors

• Won Jong Hoon
• Kim Changki
• Kim Hyung Jun
• Lee Yong Joo
• Jung Myungsup

Classifications

• G02B5/208 Primary

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• C08K3/08

  Metals · CPC title

• C08K5/235

  Diazo and polyazo compounds · CPC title

• C08K5/3417

  condensed with carbocyclic rings · CPC title

• C08K5/52

  Phosphorus bound to oxygen only · CPC title