Display panel including stack of light-converging structure and band-pass filtering structure, manufacturing method thereof, and display apparatus

1. A display panel, comprising:

a first substrate, a light-emitting element array and a color-conversion layer array, wherein the light-emitting element array is arranged on one side of the first substrate and comprises a plurality of light-emitting elements, the color-conversion layer array is located on a side of the light-emitting element array distal to the first substrate, and comprises a plurality of color-conversion layers in one-to-one correspondence with the plurality of light-emitting elements, the light-emitting elements are configured to generate and emit first color light, and the corresponding plurality of color-conversion layers are configured to generate other color lights under excitation of the first color light, wherein the display panel further comprises:

a first band-pass filtering layer located between the light-emitting element array and the color-conversion layer array, comprising: a first light-converging structure in contact with a first band-pass filtering structure, wherein the first light band-pass filtering structure is located on a side of the first light-converging structure distal to the first substrate, the first light-converging structure is configured to converge light rays, and the first band-pass filtering structure is configured to transmit first color light and reflect the other color lights; and/or

a second band-pass filtering layer located on a side of the color-conversion layer array, distal to the light-emitting element array, comprising: a second light-converging structure and a second band-pass filtering structure, wherein the second light band-pass filtering structure is located on a side of the second light-converging structure distal to the first substrate, the second light-converging structure is configured to converge light rays, and the second band-pass filtering structure is configured to transmit the other color lights and reflect the first color light.

2. The display panel of claim 1 , wherein the first light-converging structure comprises a plurality of first collimating lenses corresponding to the plurality of light-emitting elements one by one.

3. The display panel of claim 2 , further comprising a first transparent resin layer between the light-emitting element array and the color-conversion layer array,

wherein the plurality of first collimating lenses are embedded in the first transparent resin layer.

4. The display panel of claim 1 , wherein the second light-converging structure comprises a plurality of second collimating lenses corresponding to the plurality of color-conversion layers one to one.

5. The display panel of claim 4 , further comprising a second transparent resin layer on one side of the color-conversion layer array distal to the light-emitting element array,

wherein the plurality of second collimating lenses are embedded in the second transparent resin layer.

6. The display panel of claim 1 , wherein the first light-converging structure comprises at least two first light-converging films which are stacked, and a refractive index of one first light-converging film closer to the first substrate among two adjacent first light-converging films is smaller than a refractive index of the other first light-converging film farther from the first substrate among the two adjacent first light-converging films.

7. The display panel of claim 1 , wherein the second light-converging structure comprises at least two second light-converging films which are stacked, and a refractive index of one second light-converging film closer to the first substrate among two adjacent second light-converging films is smaller than a refractive index of the other second light-converging film farther from the second substrate among the two adjacent second light-converging films.

8. The display panel of claim 1 , wherein the first band-pass filtering structure is a distributed Bragg reflection structure; and/or

the second band-pass filtering structure is a distributed Bragg reflection structure.

9. The display panel of claim 1 , wherein a material of the color-conversion layer comprises a quantum dot material.

10. The display panel of claim 1 , wherein the color-conversion layer array comprises a first color-conversion layer emitting a second color light and a second color-conversion layer emitting a third color light, the other color lights comprising the second color light and the third color light; and

the first color light is blue light, the second color light is red light, and the third color light is green light.

11. The display panel of claim 10 , wherein the first band-pass filtering structure is configured to have a transmittance of 90% or more for light in a wavelength band of 400 nm to 550 nm and to totally reflect light in a wavelength band of 550 nm to 780 nm.

12. The display panel of claim 10 , wherein the second band-pass filtering structure is configured to have a transmittance of 90% or more for light in a wavelength band of 480 nm to 800 nm and to totally reflect light in a wavelength band of 380 nm to 480 nm.

13. The display panel of claim 10 , wherein the display panel is divided into a plurality of light exiting regions, and the plurality of light exiting regions correspond to the plurality of light-emitting elements one to one;

the display panel further comprises a first pixel definition layer on one side of the first substrate proximal to the light-emitting element array, and a first encapsulation layer on one side of the first substrate distal to the first pixel definition layer, and the first band-pass filtering layer is between the first encapsulation layer and the color-conversion layer array; and

the first pixel definition layer is provided with a plurality of first accommodating openings, the plurality of first accommodating openings correspond to the plurality of light exiting regions one by one, and each of the plurality of light-emitting elements is located in the corresponding first accommodating opening.

14. The display panel of claim 10 , wherein the display panel is divided into a plurality of light exiting regions, the plurality of light exiting regions correspond to the plurality of light-emitting elements one to one, and the plurality of light exiting regions comprise a plurality of first light exiting regions for emitting the first color light, a plurality of second light exiting regions for emitting the second color light, and a plurality of third light exiting regions for emitting the third color light;

an orthographic projection of the second band-pass filtering layer on the first substrate covers the second light exiting region and the third light exiting region and does not cover the first light exiting region;

the display panel further comprises a second pixel definition layer on a side of the light-emitting element array distal to the first substrate, wherein the second pixel definition layer is provided with a plurality of second accommodating openings, the plurality of second accommodating openings correspond to the plurality of light exiting regions one to one, the first color-conversion layer and the second color-conversion layer are both located in the corresponding second accommodating openings, and a transparent resin pattern is provided in the second accommodating opening corresponding to the first light exiting region.

15. The display panel of claim 14 , wherein the display panel further comprises a second encapsulation layer on one side of the second pixel definition layer proximal to the first substrate, a color filter layer on one side of the second pixel definition layer distal to the first substrate, and a second substrate on one side of the color filter layer distal to the first substrate, and a frame sealing glue between the first substrate and the second substrate in a peripheral region, and the second band-pass filtering layer is between the color filter layer and the second pixel definition layer; and

the color filter layer comprises a black matrix and a plurality of color filters, the plurality of color filters comprise a plurality of first color filters, a plurality of second color filters and a plurality of third color filters, wherein the plurality of first color filters are in one-to-one correspondence with the plurality of first light exiting regions, the plurality of second color filters are in one-to-one correspondence with the plurality of second light exiting regions, and the plurality of third color filters are in one-to-one correspondence with the plurality of third light exiting regions.

16. The display panel of claim 14 , further comprising a second encapsulation layer on one side of the second pixel definition layer distal to the first substrate, a color filter layer on one side of the second encapsulation layer distal to the first substrate, a circular polarizer on one side of the color filter layer distal to the first substrate, and a protection film on one side of the circular polarizer distal to the first substrate;

wherein the color filter layer comprises a black matrix and a plurality of color filters, the plurality of color filters comprise a plurality of first color filters, a plurality of second color filters and a plurality of third color filters, wherein the plurality of first color filters are in one-to-one correspondence with the plurality of first light exiting regions, the plurality of second color filters are in one-to-one correspondence with the plurality of second light exiting regions, and the plurality of third color filters are in one-to-one correspondence with the plurality of third light exiting regions.

17. A display apparatus, comprising the display panel of claim 1 .

18. A method of manufacturing a display panel, comprising:

preparing a first display substrate, which comprises forming a light-emitting element array on a first substrate, wherein the light-emitting element array comprises a plurality of light-emitting elements for generating and emitting a first color light; preparing a second display substrate, which comprises forming a color-conversion layer array on a second substrate, wherein the color-conversion layer array comprises a plurality of color-conversion layers which correspond to the plurality of light-emitting elements one by one, and the plurality of color-conversion layers are configured to generate other color lights under excitation of the first color light; and

aligning and assembling the first display substrate and the second display substrate such that the light-emitting element array and the color-conversion layer array are located between the first substrate and the second substrate; wherein the preparing the second display substrate further comprises, after the forming the color-conversion layer array, a step of: forming a first band-pass filtering layer on one side of the color-conversion layer array distal to the second substrate, wherein the first band-pass filtering layer comprises: a first band-pass filtering structure in contact with a first light-converging structure, the first light-converging structure is arranged on one side of the first band-pass filtering structure distal to the second substrate, the first light-converging structure is configured to converge light rays, and the first band-pass filtering structure is configured to transmit the first color light and reflect the other color lights; and/or

wherein the preparing the second display substrate further comprises, before the forming the color-conversion layer array, a step of: forming a second band-pass filtering layer on one side of the second substrate on which the color-conversion layer array is subsequently formed such that the second band-pass filtering layer comprises a second band-pass filtering structure and a second light-converging structure on one side of the second band-pass filtering structure distal to the second substrate, the second light-converging structure is configured to converge light rays, and the second band-pass filtering structure is configured to transmit the other color lights and reflect the first color light.

19. A method of manufacturing a display panel, comprising:

forming a light-emitting element array on a first substrate such that the light-emitting element array comprises a plurality of light-emitting elements for generating and emitting a first color light; forming a color-conversion layer array on one side of the light-emitting element array, distal to the first substrate, wherein the color-conversion layer array comprises a plurality of color-conversion layers in one-to-one correspondence with the plurality of light-emitting elements, and the plurality of color-conversion layers are configured to generate other color lights under excitation of the first color light; between the forming the light-emitting element array and the forming the color-conversion layer array, the method further comprises:

forming a first band-pass filtering layer on one side of the light-emitting element array distal to the first substrate such that the first band-pass filtering layer comprises a first light-converging structure in contact with a first band-pass filtering structure, wherein the first band-pass filtering structure is arranged on one side of the first light-converging structure distal to the first substrate, the first light-converging structure is configured to converge light rays, and the first band-pass filtering structure is configured to transmit the first color light and reflect the other color lights; and/or

after the forming the color-conversion layer array, the method further comprises forming a second band-pass filtering layer on one side of the color-conversion layer array distal to the first substrate such that the second band-pass filtering layer comprises a second light-converging structure and a second band-pass filtering structure, the second light-converging structure is configured to converge light rays, and the second band-pass filtering structure is configured to transmit the other color lights and reflect the first color light.

20. The method of claim 19 , wherein the first light-converging structure comprises a plurality of first collimating lenses corresponding to the plurality of light-emitting elements one by one.