Display device

Patent metadata

Field	Value
Publication number	US-12523911-B2
Application number	US-202418613463-A
Country	US
Kind code	B2
Filing date	Mar 22, 2024
Priority date	May 11, 2023
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A display device including three sequentially stacked layers of cholesteric liquid crystal cell, where each layer of cholesteric liquid crystal cell includes a cholesteric liquid crystal layer and a first electrode layer and a second electrode layer arranged on two sides of the cholesteric liquid crystal layer respectively, the first electrode layer includes multiple first electrode strips, the second electrode layer includes multiple second electrode strip, along a thickness direction of the three layers of cholesteric liquid crystal cell, the first electrode strips from different first electrode layers are disposed one to one and electrically connected, and the second electrode strips from different second electrode layers are disposed one to one and connected in parallel; the display device further includes an array transistor layer, and each of the second electrode strips in the three layers of cholesteric liquid crystal cell is connected in series with the array transistor layer.

First claim

What is claimed is:

1 . A display device, comprising three sequentially stacked layers of cholesteric liquid crystal cell, wherein
each layer of cholesteric liquid crystal cell comprises a cholesteric liquid crystal layer, and a first electrode layer and a second electrode layer arranged on two sides of the cholesteric liquid crystal layer respectively; the first electrode layer comprises at least one first electrode strip which extends in a first direction and is used for supplying a signal COM to the cholesteric liquid crystal layer, the second electrode layer comprises at least one second electrode strip which extends in a second direction and is used for supplying a voltage to a corresponding cholesteric liquid crystal layer for rotation, and the first direction intersects the second direction; in each layer of cholesteric liquid crystal cell, an overlapping region of the first electrode strip and the second electrode strip constitutes a display unit; colors of the cholesteric liquid crystal layers in the three layers of cholesteric liquid crystal cell are red, green, and blue, respectively; along a thickness direction of the three layers of cholesteric liquid crystal cell, the first electrode strips from different first electrode layers are disposed one to one and electrically connected, and the second electrode strips from different second electrode layers are disposed one to one; and along the thickness direction of the three layers of cholesteric liquid crystal cell, three second electrode strips corresponding to the display unit are connected in parallel; along the thickness direction of the three layers of cholesteric liquid crystal cell, projections of the first electrode strips from different first electrode layers overlap, and projections of the second electrode strips from different second electrode layers overlap; and the display device further comprises an array transistor layer, a cholesteric liquid crystal cell located at a first position in the three layers of cholesteric liquid crystal cell is a first cholesteric liquid crystal cell, the second electrode layer in the first cholesteric liquid crystal cell is arranged on the array transistor layer, and each of the second electrode strips in the three layers of cholesteric liquid crystal cell is connected in series with a drain of the array transistor layer.

2 . The display device according to claim 1 , wherein a first substrate is arranged between two adjacent layers of cholesteric liquid crystal cell for separating the two adjacent layers of cholesteric liquid crystal cell.

3 . The display device according to claim 1 , wherein a cholesteric liquid crystal cell located at a last position in the three layers of cholesteric liquid crystal cell is a second cholesteric liquid crystal cell, a second substrate covers a side of the second cholesteric liquid crystal cell away from the other cholesteric liquid crystal cells, and a light-shading layer covers a side of the second substrate away from the second cholesteric liquid crystal cell.

4 . The display device according to claim 1 , wherein the first cholesteric liquid crystal cell further comprises a light-absorbing layer located between the cholesteric liquid crystal layer and the second electrode layer and a third substrate located between the light-absorbing layer and the second electrode layer.

5 . The display device according to claim 4 , wherein the third substrate comprises an organic film layer and inorganic film layers arranged on both side of the organic film layer; and/or, thickness of the third substrate is 10 μm to 14 μm.

6 . The display device according to claim 1 , wherein in a single cholesteric liquid crystal cell, a first alignment film is disposed between the cholesteric liquid crystal layer and the first electrode layer, and a second alignment film is disposed between the cholesteric liquid crystal layer and the second electrode layer.

7 . The display device according to claim 1 , wherein length of the cholesteric liquid crystal layer is less than length of the first electrode layer and less than length of the second electrode layer, the cholesteric liquid crystal layer is located at a middle portion of the first electrode layer and the second electrode layer, and sandwiched between the first electrode layer and the second electrode layer is an edge sealant adhesive layer which is located at both ends of the cholesteric liquid crystal layer.

8 . The display device according to claim 1 , wherein the first electrode strips and the second electrode strips are all light-permeable electrodes; and/or, the first direction and the second direction are perpendicular to each other.

9 . The display device according to claim 1 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

10 . The display device according to claim 2 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

11 . The display device according to claim 3 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

12 . The display device according to claim 4 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

13 . The display device according to claim 5 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

14 . The display device according to claim 6 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

15 . The display device according to claim 7 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

16 . The display device according to claim 8 , wherein the second electrode strip in the first cholesteric liquid crystal cell is made of corrosion-resistant conductive material which comprises one or more of indium tin oxide, graphite, nickel-based alloys, titanium alloys, carbon fibers.

Assignees

• Hkc Corp Ltd

Inventors

• Li Yao
• Huang Tianjun
• Cao Zhonglin
• Wu Chuan
• Ye Lidan

Classifications

• G02F1/1347

  Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/13718 Primary

  based on a change of the texture state of a cholesteric liquid crystal · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02F1/1368 Primary

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title