Polymer liquid crystal dimming box, manufacturing method thereof, and display module

Patent metadata

Field	Value
Publication number	US-2024402539-A1
Application number	US-202318373329-A
Country	US
Kind code	A1
Filing date	Sep 27, 2023
Priority date	May 31, 2023
Publication date	Dec 5, 2024
Grant date	—

Abstract

A polymer liquid crystal dimming box, a manufacturing method thereof, and a display module are provided. The polymer liquid crystal dimming box includes a first substrate, a second substrate, a polymer liquid crystal layer, a frame adhesive layer and a light-shielding structure. The light-shielding structure is disposed between the frame adhesive layer and the polymer liquid crystal layer and surrounds the polymer liquid crystal layer. The light-shielding structure is used to absorb ultraviolet light obliquely incident during the curing process of the frame adhesive layer. In this way, the problem that the polymer liquid crystal layer is cured in advance due to ultraviolet light irradiation can be avoided, the edge failure of the polymer liquid crystal dimming box can be improved, which is conducive to mass production.

First claim

What is claimed is:

1 . A polymer liquid crystal dimming box comprising:
a first substrate; a second substrate disposed opposite to the first substrate; a polymer liquid crystal layer disposed between the first substrate and the second substrate; a frame adhesive layer disposed between the first substrate and the second substrate; and a light-shielding structure disposed between the frame adhesive layer and the polymer liquid crystal layer and surrounding the polymer liquid crystal layer.

2 . The polymer liquid crystal dimming box according to claim 1 , wherein opposite side surfaces of the light-shielding structure in a stacking direction of the first substrate and the second substrate are in contact with the first substrate and the second substrate, respectively.

3 . The polymer liquid crystal dimming box according to claim 2 , wherein the light-shielding structure comprises a plurality of light-shielding pillars disposed at intervals, each of the light-shielding pillars is annular and surrounds the polymer liquid crystal layer.

4 . The polymer liquid crystal dimming box according to claim 3 , wherein at least one supporting pillar is further disposed between the first substrate and the second substrate, the supporting pillar is disposed in the polymer liquid crystal layer, and the supporting pillar and the plurality of light-shielding pillars are disposed in the same layer.

5 . The polymer liquid crystal dimming box according to claim 4 , further comprising a dielectric layer filled between two adjacent ones of plurality of light-shielding pillars, wherein a refractive index of the dielectric layer is greater than a refractive index of the first substrate.

6 . The polymer liquid crystal dimming box according to claim 3 , wherein an optical density range of the light-shielding structure is greater than 2, and an optical density range of each of the plurality of light-shielding pillars is greater than 1.

7 . The polymer liquid crystal dimming box according to claim 1 , wherein the light-shielding structure comprises a first light-shielding layer close to the liquid crystal layer and a second light-shielding layer close to the frame adhesive layer, the first light-shielding layer comprises a plurality of first light-shielding pillars disposed at intervals, the second light-shielding layer comprises a plurality of second light-shielding pillars disposed at intervals, and the plurality of first light-shielding pillars and the plurality of first light-shielding pillars are alternately disposed.

8 . The polymer liquid crystal dimming box according to claim 1 , wherein the light-shielding structure is in contact with the frame adhesive layer.

9 . The display panel according to claim 1 , wherein the frame adhesive layer is transparent.

10 . A method for manufacturing a polymer liquid crystal dimming box, comprising steps of:
forming a first motherboard and a second motherboard, and forming a light-shielding structure on the first motherboard or the second motherboard; pairing the first motherboard and the second motherboard; forming a frame adhesive layer between the first motherboard and the second motherboard by coating; forming a polymer liquid crystal layer between the first motherboard and the second motherboard by dripping polymer liquid crystals, and the polymer liquid crystal layer being formed on one side of the light-shielding structure away from the frame adhesive layer; curing the frame adhesive layer by ultraviolet irradiation; curing the polymer liquid crystal layer; and cutting the first motherboard and the second motherboard after they are paired along a cutting line to form a plurality of polymer liquid crystal dimming boxes.

11 . The method according to claim 10 , further comprising providing a UV mask, and disposing the UV mask on one side of the polymer liquid crystal dimmer box;
wherein the UV mask comprises a light-shielding area and a light-transmitting area, the light-shielding area at least corresponds to an area where the polymer liquid crystal layer and the light-shielding structure are located, and the light-transmitting area corresponds to an area where the frame adhesive layer is disposed; and wherein the UV mask further comprises a substrate, and a light refraction layer and a light-shielding layer disposed on the substrate, wherein the light refraction layer is disposed in the light-transmitting area, the light-shielding layer is disposed in the light-shielding area, and a refractive index of the light refraction layer is greater than 1.

12 . A display module, comprising:
a display panel; and a polymer liquid crystal dimming box disposed on a light-emitting side of the display panel; wherein the polymer liquid crystal dimming box comprises: a first substrate; a second substrate disposed opposite to the first substrate; a polymer liquid crystal layer disposed between the first substrate and the second substrate; a frame adhesive layer disposed between the first substrate and the second substrate; and a light-shielding structure disposed between the frame adhesive layer and the polymer liquid crystal layer and surrounding the polymer liquid crystal layer.

13 . The display module according to claim 12 , wherein opposite side surfaces of the light-shielding structure in a stacking direction of the first substrate and the second substrate are in contact with the first substrate and the second substrate, respectively.

14 . The display module according to claim 13 , wherein the light-shielding structure comprises a plurality of light-shielding pillars disposed at intervals, each of the light-shielding pillars is annular and surrounds the polymer liquid crystal layer.

15 . The display module according to claim 14 , wherein at least one supporting pillar is further disposed between the first substrate and the second substrate, the supporting pillar is disposed in the polymer liquid crystal layer, and the supporting pillar and the plurality of light-shielding pillars are disposed in the same layer.

16 . The display module according to claim 15 , further comprising a dielectric layer filled between two adjacent ones of plurality of light-shielding pillars, wherein a refractive index of the dielectric layer is greater than a refractive index of the first substrate.

17 . The display module according to claim 14 , wherein an optical density range of the light-shielding structure is greater than 2, and an optical density range of each of the plurality of light-shielding pillars is greater than 1.

18 . The display module according to claim 12 , wherein the light-shielding structure comprises a first light-shielding layer close to the liquid crystal layer and a second light-shielding layer close to the frame adhesive layer, the first light-shielding layer comprises a plurality of first light-shielding pillars disposed at intervals, the second light-shielding layer comprises a plurality of second light-shielding pillars disposed at intervals, and the plurality of first light-shielding pillars and the plurality of first light-shielding pillars are alternately disposed.

19 . The display module according to claim 12 , wherein the light-shielding structure is in contact with the frame adhesive layer.

20 . The display module according to claim 12 , wherein the frame adhesive layer is transparent.

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Cheng Wei

Classifications

• G02F1/1339 Primary

  Gaskets; Spacers; Sealing of cells · CPC title

• G02F1/1334

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• G02F1/133711 Primary

  by organic films, e.g. polymeric films · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F1/133788 Primary

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title