Granted Patent B2

US 12,517,411 · App. 18/043,812 · Granted Jan 6, 2026

Inventors: In Hae Lee (Seoul, KR); Chan Mi Ju (Seoul, KR); Hyeon Ji Hong (Seoul, KR); Jun Lee (Seoul, KR); Gyu Lin Lee (Seoul, KR); Beom Sun Hong (Seoul, KR)

Assignee: LG INNOTEK CO., LTD.

G02F1/167G02F1/1323G02F1/1681G06F3/041H10K59/80H10K59/8722

Abstract

Claims (42)

1 . A light path control member comprising:

a first substrate;

a first electrode disposed on the first substrate;

a second substrate disposed on the first substrate;

a second electrode disposed under the second substrate; and

a light conversion part disposed between the first electrode and the second electrode,

wherein the light conversion part includes a plurality of partition wall portions, at least one receiving portion, and a base portion,

wherein the light conversion part is adapted to change a viewing angle of light transmitted through the light path control member due to a movement of electrophoretic particles by application of a voltage between the first electrode and the second electrode, and wherein the electrophoretic particles are disposed in the at least one receiving portion,

wherein each of the plurality of partition wall portions partitions the light conversion part such that the partition wall portions and the at least one receiving portion are alternately disposed, and wherein the base portion is a region formed during an imprinting process for forming the partition wall portions and the at least one receiving portion,

wherein a light conversion material is disposed in the at least one receiving portion,

wherein the light path control member comprises a first sealing portion sealing the light conversion material,

wherein the first sealing portion is arranged along a horizontal direction extending from one end to an other end,

wherein the other end of the first sealing portion extends into an inner region of the at least one receiving portion,

wherein a sealing region is formed by removing the second substrate and the second electrode, wherein the sealing region is a region where the second substrate and the second electrode are removed to allow injection of the light conversion material and a sealing material,

wherein the first sealing portion is disposed extending from the sealing region into the at least one receiving portion,

wherein the first sealing portion includes a bending area between one end and the other end,

wherein the first sealing portion includes a first part disposed in the sealing region; and a second part disposed inside the at least one receiving portion,

wherein a first length of the first part and a second length of the second part are defined as lengths in the extension direction of the receiving portion, the first length and the second length are defined for each of the at least one receiving portion,

wherein a maximum deviation length of the second part disposed in the receiving portion is 100 μm or less, and

wherein the first sealing portion includes a plurality of bending areas that contact each of the at least one receiving portions.

2 . The light path control member of claim 1 , wherein the first sealing portion includes a 1 - 1 sealing portion and a 1 - 2 sealing portion disposed facing each other.

3 . The light path control member of claim 2 ,

wherein the second length is 100 μm to 2 mm.

4 . The light path control member of claim 2 , wherein a length of the 1 - 1 sealing portion and a length of the 1 - 2 sealing portion are different from each other.

5 . The light path control member of claim 1 , wherein the first sealing portion includes the sealing material,

wherein the first sealing portion contacts the inner surface of the at least one receiving portion.

6 . The light path control member of claim 5 , wherein a viscosity of the sealing material is 1200 cP to 1300 cP.

7 . The light path control member of claim 1 , wherein the first length is 100 μm to 2 mm.

8 . The light path control member of claim 7 , wherein the second length is at least 50% of the first length.

9 . The light path control member of claim 1 , wherein the maximum deviation length of the second length disposed in the at least one receiving portion is 1 μm to 100 μm.

10 . The light path control member of claim 1 , wherein a pitch deviation of the partition wall portions is 40 μm or less.

11 . The light path control member of claim 1 , wherein the first length, the second length, and the maximum deviation length are different.

12 . The light path control member of claim 11 , wherein the first length is greater than the second length and the maximum deviation length,

wherein the second length is greater than the maximum deviation length.

13 . The light path control member of claim 1 , comprising a mixed region between the first sealing portion and the light conversion material.

14 . The light path control member of claim 13 , wherein the mixed region is defined as a region in which the sealing material and the light conversion material are mixed.

15 . The light path control member of claim 1 , wherein the first sealing portion is bent in a plurality of directions.

16 . The light path control member of claim 1 , wherein the first sealing portion includes a first bending area extending toward the light conversion material; and a second bending area extending in a direction of a dam portion.

17 . The light path control member of claim 16 , wherein a length of the first bending area and a length of the second bending area are different.

18 . A display device comprising:

a panel including at least one of a display panel and a touch panel; and

the light path control member of claim 1 , which is disposed on or under the panel.

Assignments (1)

Priority Claims (2)

Continuity (1)

References Cited (38)