Display apparatus and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-11611056-B2
Application number	US-202016863066-A
Country	US
Kind code	B2
Filing date	Apr 30, 2020
Priority date	Nov 25, 2019
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

A display apparatus and a method of manufacturing the same are provided. The display apparatus includes a substrate, and a plurality of display devices, an encapsulation layer, a microlens array and a protective layer which are sequentially provided on the substrate, and the microlens array includes a plurality of microlenses corresponding to the plurality of display devices, and each microlens in the microlens array comprises a multi-step structure including a plurality of steps.

First claim

What is claimed is:

1. A display apparatus, comprising a substrate, and a plurality of display devices, an encapsulation layer, a microlens array and a protective layer which are sequentially provided on the substrate,
wherein the microlens array comprises a plurality of microlenses corresponding to the plurality of display devices, and each microlens in the microlens array comprises a multi-step structure having a plurality of steps,
wherein a bottom of the multi-step structure faces the plurality of display devices so that light emitted by the pluarity of display devices irrdiates on the bottom of the multi-step structure to be converged by the multi-step structure; and
a phase difference between a highest point and a lowest point of the multi-step structure is (2π/λ) (n1−n0) h, where λ represents a wavelength of an incident light, n1 represents a refractive index of the multi-step structure, n0 represents a refractive index of the protective layer, and h represents a height of the highest point of the multi-step structure.

2. The display apparatus of claim 1 , wherein a thickness of the encapsulation layer is equal to a focal length of each of the plurality of microlenses.

3. The display apparatus of claim 2 , wherein an orthographic projection of the microlens on the substrate is a square.

4. The display apparatus of claim 2 , wherein the multi-step structure is made of a same material.

5. The display apparatus of claim 1 , wherein heights of at least two steps in the multi-step structure are different from each other.

6. The display apparatus of claim 1 , wherein heights of the plulriaty of steps in the multi-step structure monotonically decrease in a direction from a center to an edge of the microlens.

7. The display apparatus of claim 1 , wherein the plurality of display devices each comprises a light emitting diode or an organic light emitting diode, and the protective layer is made of a transparent material.

8. The display apparatus of claim 1 , wherein the encapsulation layer is made of an organic material.

9. The display apparatus of claim 8 , wherein the organic material comprises resin or poly methyl methacrylate.

10. The display apparatus of claim 1 , wherein an orthographic projection of the microlens on the substrate is a square.

11. The display apparatus of claim 1 , wherein the multi-step structure is made of a same material.

12. The display apparatus of claim 11 , wherein the same material is photoresist or silicon nitride.

13. The display apparatus of claim 1 , wherein the phase difference is within 2π, and the height h is not larger than λ/(n1−n0).

14. A method for manufacturing a display apparatus, comprising:
forming a plurality of display devices on a substrate;
forming an encapsulation layer on the plurality of display devices;
coating an exposure material layer on the encapsulation layer, and dividing the exposure material layer into a plurality of microlens regions corresponding to the plurality of display devices;
dividing each of the plurality of microlens regions into a plurality of sampling regions according to a phase-transform function for the microlens; and
forming a multi-step structure comprising a plurality of steps by performing a patterning process on the plurality of sampling regions in the microlens region,
wherein the multi-step structure in the microlens region constitutes a microlens and a bottom of the multi-step structure faces the plurality of display devices so that light emitted by the pluarity of display devices irrdiates on the bottom of the multi-step structure to be converged by the multi-step structure,
wherein after forming a multi-step structure comprising a plurality of steps by performing a patterning process on the plurality of sampling regions in the microlens region, the method further comprises: forming a protective layer on the multi-step structure; and
a phase difference between a highest point and a lowest point of the multi-step structure is (2π/λ) (n1−n0) h, where λ represents a wavelength of an incident light, n1 represents a refractive index of the multi-step structure, n0 represents a refractive index of the protective layer, and h represents a height of the highest point of the multi-step structure.

15. The method of claim 14 , wherein the patterning process is an overlay lithography process, and forming a multi-step structure comprising a plurality of steps by performing a patterning process on the plurality of sampling regions in the microlens region comprises:
aligning patterns of a plurality of preset mask plates with the plurality of sampling regions in sequence; and
exposing, developing, and etching the exposure material layer in each of the plurality of microlens regions to form the multi-step structure comprising the plurality of steps.

16. The method of claim 15 , wherein a relationship between the number of the plurality of preset mask plates and the number of steps in the multi-step structure satisfies: L=2 n , where L represents the number of steps in the multi-step structure, and n represents the number of the plurality of preset mask plates.

17. The method of claim 14 , wherein dividing each of the plurality of microlens regions into a plurality of sampling regions according to a phase-transform function for the microlens comprises:
uniformly sampling the microlens region at an equal interval in a row direction and in a column direction, according to the phase-transform function for the microlens, to form the plurality of the sampling regions.

18. The method of claim 14 , wherein the encapsulation layer is made of an organic material.

19. The method of claim 18 , wherein the organic material comprises resin or poly methyl methacrylate.

20. The method of claim 14 , wherein the phase difference is within 2π, and the height h is not larger than λ/(n1−n0).

Assignees

• Boe Technology Group Co Ltd

Inventors

• Xue Gaolei
• Meng Xiandong
• Wang Wei
• Wang Can
• Chen Xiaochuan

Classifications

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K50/858

  comprising refractive means, e.g. lenses · CPC title

• H10K59/873 Primary

  Encapsulations · CPC title

• G09F9/00

  Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) · CPC title

• H10K50/84

  Passivation; Containers; Encapsulations · CPC title