Filter structure, filter layer and display panel

1. A filter structure, comprising:

a first transflective layer;

a second transflective layer, opposite to the first transflective layer, a refractive index of the second transflective layer being substantially the same as a refractive index of the first transflective layer; and

a transparent film, located between the first transflective layer and the second transflective layer, and in contact with surfaces of the first transflective layer and the second transflective layer, a refractive index of the transparent film being smaller than that of the first transflective layer and the second transflective layer,

wherein the filter structure is configured to make light of a specific wavelength range in incident light that is incident from the first transflective layer into the filter structure be emergent from the second transflective layer by adjusting at least one of a thickness and the refractive index of the transparent film, a thickness and the refractive index of the first transflective layer, and a thickness and the refractive index of the second transflective layer, and make a transmittance of the light of the specific wavelength range be not less than 90%, by adjusting at least one of the thickness, the refractive index, and an extinction coefficient of the second transflective layer;

the thickness of the first transflective layer and the thickness of the second transflective layer are in a range of about 200 angstroms to 400 angstroms.

2. The filter structure according to claim 1 , wherein an optical thickness of the transparent film and a central wavelength of the light of the specific wavelength range satisfy a formula below:

λ=2 nh/m, m=k +(φ1+φ2)/2π, k= 0,1,2 . . . ,

where, n is the refractive index of the transparent film; h is the thickness of the transparent film, k is an interference order; φ1 and φ2 are respectively reflection phases of the first transflective layer and the second transflective layer; and λ, is the central wavelength of the light of the specific wavelength range.

3. The filter structure according to claim 1 , wherein the refractive index of the first transflective layer and the refractive index of the second transflective layer are in a range of about 3.5 to 4.5.

4. The filter structure according to claim 1 , wherein an extinction coefficient of the first transflective layer and the extinction coefficient of the second transflective layer are not greater than 0.1.

5. The filter structure according to claim 1 , wherein the refractive index of the transparent film is 1.3 to 2.0.

6. The filter structure according to claim 5 , wherein the thickness of the transparent film is in a range of 1600 angstroms to 2800 angstroms.

7. The filter structure according to claim 1 , wherein the thickness of the first transflective layer is equal to the thickness of the second transflective layer.

8. The filter structure according to claim 3 , wherein a material of the first transflective layer is the same as a material of the second transflective layer.

9. The filter structure according to claim 8 , wherein the material of the first transflective layer and the material of the second transflective layer comprise metal or silicon; or the first transflective layer and the second transflective layer both comprise multiple transparent dielectric films, the multiple transparent dielectric films comprise first optical films and second optical films which have a count of N and are alternately arranged, where, N is an even number; and a refractive index of each of the first optical films is larger than a refractive index of each of the second optical films.

10. The filter structure according to claim 1 , wherein the light of the specific wavelength range is monochromatic light, and the monochromatic light is one of red light, green light, blue light, cyan light, yellow light and magenta light.

11. A filter layer, comprising a plurality of filter structures arranged in an array, each of the filter structures being the filter structure according to claim 1 ,

wherein an arrangement direction of the plurality of filter structures is parallel to a plane where the transparent film is located.

12. A display panel, comprising the filter layer according to claim 11 .

13. The display panel according to claim 12 , wherein the filter layer is configured to exit light of specific wavelength ranges of different colors, and the plurality of filter structures included in the filter layer and a plurality of sub-pixels included in the display panel are arranged in one-to-one correspondence.

14. The display panel according to claim 13 , wherein the display panel comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel, a cyan sub-pixel, a yellow sub-pixel and a magenta sub-pixel, and the filter layer is configured to exit red light, green light, blue light, cyan light, yellow light and magenta light.

15. The display panel according to claim 13 , wherein the display panel comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the filter layer is configured to exit red light, green light and blue light.

16. The filter structure according to claim 1 , wherein an extinction coefficient of the first transflective layer and the extinction coefficient of the second transflective layer are not greater than 0.1, the refractive index of the transparent film is 1.3 to 2.0.

17. The filter structure according to claim 16 , wherein the thickness of the transparent film is in a range of 1600 angstroms to 2800 angstroms.

18. A filter structure, comprising:

a first transflective layer;

a second transflective layer, opposite to the first transflective layer, a refractive index of the second transflective layer being substantially the same as a refractive index of the first transflective layer; and

a transparent film, located between the first transflective layer and the second transflective layer, and in contact with surfaces of the first transflective layer and the second transflective layer, a refractive index of the transparent film being smaller than that of the first transflective layer and the second transflective layer,

wherein the filter structure is configured to make light of a specific wavelength range in incident light that is incident from the first transflective layer into the filter structure be emergent from the second transflective layer by adjusting at least one of a thickness and the refractive index of the transparent film, a thickness and the refractive index of the first transflective layer, and a thickness and the refractive index of the second transflective layer, and make a transmittance of the light of the specific wavelength range be not less than 90%, by adjusting at least one of the thickness, the refractive index, and an extinction coefficient of the second transflective layer;

the refractive index of the transparent film is 1.3 to 2.0, the thickness of the transparent film is in a range of 1600 angstroms to 2800 angstroms.