Method for manufacturing light field display device and light field display device

Patent metadata

Field	Value
Publication number	US-12510693-B2
Application number	US-202217575511-A
Country	US
Kind code	B2
Filing date	Jan 13, 2022
Priority date	Jan 18, 2021
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A method for manufacturing a light field display device and a light field display device are provided, the method includes: forming a plano-concave lens layer on a substrate, and the plano-concave lens layer comprises a plurality of plano-concave lenses arranged in an array and a plurality of alignment marks arranged at preset positions; forming a first planarization layer covering the plano-concave lens layer to form a microlens array, the first planarization layer having a refractive index greater than a refractive index of the plano-concave lens layer; attaching the light-emitting side of the display panel to a side of the microlens array away from the substrate according to the alignment mark.

First claim

The invention claimed is:

1 . A method for manufacturing a light field display device, comprising:
coating a nanoimprint resist on a substrate to form an imprint resist layer; forming a plano-concave lens layer on the substrate by imprinting the imprint resist layer using a nanoimprint template, wherein the plano-concave lens layer comprises a plurality of plano-concave lenses arranged in an array and a plurality of alignment marks arranged at preset positions, and the concave openings of the plurality of plano-concave lenses face a direction away from the substrate; forming a first planarization layer covering the plano-concave lens layer to form a microlens array, the first planarization layer having a refractive index greater than a refractive index of the plano-concave lens layer; and attaching the light-emitting side of a display panel to a side of the microlens array away from the substrate according to the plurality of alignment marks; wherein the first planarization layer is at a side of the plano-concave lens layer adjacent to the display panel, and wherein the plano-concave lens layer further includes a plurality of spacer portions disposed between every two adjacent plano-concave lenses, and the plurality of alignment marks are arranged at a part of or all of the plurality of spacer portions.

2 . The manufacturing method according to claim 1 , wherein the forming a first planarization layer covering the plano-concave lens layer to form a microlens array further comprises:
forming a plurality of light shielding portions on the first planarization layer according to the plurality of alignment marks, an orthographic projection of the light shielding portions on the substrate covering an orthographic projection of the spacer portions on the substrate; forming a second planarization layer covering the light shielding portions and the first planarization layer on the light shielding portions and the exposed first planarization layer to form a microlens array.

3 . The manufacturing method according to claim 2 , wherein the attaching a light-emitting side of the display panel to a side of the microlens array away from the substrate according to the plurality of alignment marks further comprises:
attaching a light-emitting side of a display panel to a side of the second planarization layer away from the substrate according to the plurality of alignment marks.

4 . The manufacturing method according to claim 2 , wherein the forming a plurality of light shielding portions on the first planarization layer according to the plurality of alignment marks further comprises:
forming a light shielding layer on the first planarization layer; and forming a plurality of light shielding portions by patterning the light shielding layer according to the plurality of alignment marks.

5 . The manufacturing method according to claim 2 , wherein
the length of the spacer portion is less than or equal to 5 μm.

6 . The manufacturing method according to claim 2 , wherein
the light shielding portion is a black matrix, the length of the light shielding portion is greater than or equal to the length of the spacer portion and less than or equal to 10 μm, and the thickness of the light shielding portion is greater than or equal to 1 μm and less than or equal to 3 μm.

7 . The manufacturing method according to claim 2 , wherein
the thickness of the second planarization layer is greater than or equal to 2 μm and less than or equal to 5 μm.

8 . The manufacturing method according to claim 1 , wherein the nanoimprint template comprises a plurality of convex lenses arranged in an array and a plurality of alignment marks arranged at preset positions.

9 . The manufacturing method according to claim 1 , wherein
the aperture of the plano-concave lens is greater than or equal to 5 μm and less than or equal to 500 μm, and the arch height of the plano-concave lens is greater than or equal to 2 μm and less than or equal to 50 μm.

10 . The manufacturing method according to claim 1 , wherein
the thickness of the plano-concave lens layer is greater than or equal to 5 μm and less than or equal to 50 μm, the refractive index of the plano-concave lens layer is greater than or equal to 1.3 and less than or equal to 1.45, and the transmittance of the plano-concave lens layer is greater than 80%.

11 . The manufacturing method according to claim 1 , wherein
the thickness of the first planarization layer is greater than or equal to 5 μm and less than or equal to 50 μm, the refractive index of the first planarization layer is greater than or equal to 1.55 and less than or equal to 1.75, and the transmittance of the first planarization layer is greater than 80%.

12 . A light field display device which is manufactured by the method according to claim 1 and comprises a display panel and a microlens array arranged on a light-emitting side of the display panel, wherein the microlens array comprises a substrate, a plano-concave lens layer and a first planarization layer which are arranged on the substrate and are far and near from the display panel in sequence, the plano-concave lens layer comprises a plurality of plano-concave lenses arranged in an array and a plurality of alignment marks arranged at preset positions, and the refractive index of the first planarization layer is greater than the refractive index of the plano-concave lens layer;
wherein the first planarization layer is at a side of the plano-concave lens layer adjacent to the display panel;
wherein the plano-concave lens layer further includes a plurality of spacer portions disposed between every two adjacent plano-concave lenses, and the plurality of alignment marks are arranged at a part of or all of the plurality of spacer portions.

13 . The light field display device according to claim 12 , wherein the microlens array further comprises a light shielding portion on the first planarization layer, and a second planarization layer covering the light shielding portion and the exposed first planarization layer, the orthographic projection of the light shielding portion on the substrate covering the orthographic projection of the spacer portion on the substrate.

14 . The light field display device according to claim 12 , wherein the display panel is one of a liquid crystal display panel, an electroluminescent display panel, a quantum dot light emitting display panel, a micro LED display panel, a Micro LED display panel and a Mini LED display panel.

15 . The light field display device according to claim 13 , wherein
the length of the spacer portion is less than or equal to 5 μm.

16 . The light field display device according to claim 13 , wherein
the light shielding portion is a black matrix, the length of the light shielding portion is greater than or equal to the length of the spacer portion and less than or equal to 10 μm, and the thickness of the light shielding portion is greater than or equal to 1 μm and less than or equal to 3 μm.

17 . The light field display device according to claim 13 , wherein
the thickness of the second planarization layer is greater than or equal to 2 μm and less than or equal to 5 μm.

18 . The light field display device according to claim 12 , wherein
the aperture of the plano-concave lens is greater than or equal to 5 μm and less than or equal to 500 μm, and the arch height of the plano-concave lens is greater than or equal to 2 μm and less than or equal to 50 μm.

19 . The light field display device according to claim 12 , wherein
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Assignees

• Boe Technology Group Co Ltd

Inventors

• Guo Kang
• Song Mengya
• Li Duohui
• Gu Xin
• Zhang Feng
• Wang Meili
• Wang Fei
• Gu Renquan
• Yao Qi
• Yuan Guangcai
• Dong Xue
• Yu Jing

Classifications

• H10W90/00 Primary

  Package configurations · CPC title

• H10H20/0363

  of optical field-shaping means · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/01

  Manufacture or treatment · CPC title

• G02B3/0056

  arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085) · CPC title