Display panel and display device

Patent metadata

Field	Value
Publication number	US-12306493-B2
Application number	US-202218282335-A
Country	US
Kind code	B2
Filing date	Nov 30, 2022
Priority date	Nov 30, 2022
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A display substrate and a display device relate to the technical field of displaying. The display substrate includes a plurality of display units spaced apart from each other and a plurality of connection units, the plurality of connection units being connected between two adjacent display units; the plurality of connection units include: two connection units arranged along a first direction, wherein the first direction is parallel to a stretching direction of the display substrate; wherein the two connection units arranged along the first direction are axisymmetric with respect to a first reference line, so that the plurality of connection units arranged along a second direction have a same deformation amount in a stretching state, the second direction is perpendicular to the stretching direction, and an extension direction of the first reference line is parallel to the second direction.

First claim

The invention claimed is:

1. A display panel, comprising:
a first polarization unit;
a reflection unit disposed opposite to the first polarization unit; and
at least one liquid crystal cell disposed between the first polarization unit and the reflection unit; the liquid crystal cell comprises a liquid crystal layer, and a liquid crystal in the liquid crystal layer has birefringence and optical rotation, and a range of a total equivalent retardation amount of the liquid crystals in all the liquid crystal cells comprises 100 nm˜441 nm;
wherein the display panel at least comprises a first liquid crystal cell and a second liquid crystal cell, wherein the first liquid crystal cell is disposed between the first polarization unit and the second liquid crystal cell, and the second liquid crystal cell is disposed between the first liquid crystal cell and the reflection unit;
the first liquid crystal cell comprises a first liquid crystal layer, and the second liquid crystal cell comprises a second liquid crystal layer, and an equivalent retardation amount of a first liquid crystal in the first liquid crystal layer is larger than that of a second liquid crystal in the second liquid crystal layer.

2. The display panel according to claim 1 , wherein a twist angle range of the liquid crystal in the liquid crystal layer of each of the liquid crystal cells comprises 0°˜90°.

3. The display panel according to claim 2 , wherein the liquid crystal in the liquid crystal layer of each of the liquid crystal cells is cholesteric liquid crystal; and
each of the liquid crystal cells further comprises two electrodes disposed opposite to each other, and the cholesteric liquid crystal is located between the two electrodes disposed opposite to each other.

4. A display device comprising the display panel according to claim 1 .

5. The display panel according to claim 3 , wherein the display panel comprises the first liquid crystal cell and the second liquid crystal cell, and a range of the equivalent retardation amount of the first liquid crystal in the first liquid crystal layer comprises 200 nm˜400 nm; and
a range of the equivalent retardation amount of the second liquid crystal in the second liquid crystal layer comprises 100 nm˜200 nm.

6. The display panel according to claim 5 , wherein an equivalent optical axis direction of the first liquid crystal in the first liquid crystal layer is the same as an equivalent optical axis direction of the second liquid crystal in the second liquid crystal layer, and a range of the included angle of both the equivalent optical axis direction with a transmission axis of the first polarization unit comprises 42°˜48°.

7. The display panel according to claim 6 , wherein the first liquid crystal in the first liquid crystal layer has a first twist angle, and the second liquid crystal in the second liquid crystal layer has a second twist angle, a range of one of the first twist angle and the second twist angle comprises 0°˜34°, and a range of the other one of the first twist angle and the second twist angle comprises 89°˜90°.

8. The display panel according to claim 7 , wherein the thickness of the first liquid crystal cell along the direction perpendicular to the first polarization unit is larger than the thickness of the second liquid crystal cell along the direction perpendicular to the first polarization unit.

9. The display panel according to claim 8 , wherein the first liquid crystal cell further comprises a first substrate and a second substrate, wherein the first substrate is disposed opposite to the second substrate, the first substrate comprises a first electrode, and the second substrate comprises a second electrode, and the first liquid crystal layer is disposed between the first electrode and the second electrode; the second liquid crystal cell further comprises a third substrate and a fourth substrate, wherein the third substrate is disposed opposite to the fourth substrate, the third substrate comprises a third electrode, and the fourth substrate comprises a fourth electrode, and the second liquid crystal layer is disposed between the third electrode and the fourth electrode; and
the first electrode and the second electrode are configured to have a first voltage difference, and the third electrode and the fourth electrode are configured to have a second voltage difference, when any one of the first voltage difference and the second voltage difference is not zero, a total equivalent retardation amount of the first liquid crystal in the first liquid crystal layer and the second liquid crystal in the second liquid crystal layer is less than a total equivalent retardation amount of the first liquid crystal in the first liquid crystal layer and the second liquid crystal in the second liquid crystal layer when both the first voltage difference and the second voltage difference are zero.

10. The display panel according to claim 9 , wherein under the condition that the first voltage difference is configured to be at a first fixed value, and the second voltage difference is configured to change within a first preset range, the range of the equivalent retardation amount of the first liquid crystal in the first liquid crystal layer comprises 200 nm˜400 nm; and the range of the equivalent retardation amount of the second liquid crystal in the second liquid crystal layer comprises 130 nm˜154 nm.

11. The display panel according to claim 10 , wherein a range of the first fixed value comprises 0V˜6V; and the first preset range comprises 0V˜10V.

12. The display panel according to claim 9 , wherein under the condition that the second voltage difference is configured to be at a second fixed value, and the first voltage difference is configured to change within a second preset rang, the range of the equivalent retardation amount of the first liquid crystal in the first liquid crystal layer comprises 240 nm˜275 nm; the range of the equivalent retardation amount of the second liquid crystal in the second liquid crystal layer comprises 100 nm˜200 nm.

13. The display panel according to claim 12 , wherein a range of the second fixed value range comprises 0V˜10V; and the second preset range comprises 0 v˜10V.

14. The display panel according to claim 3 , wherein the display panel comprises a third liquid crystal cell disposed between the first polarization unit and the reflection unit; and
the display panel further comprises a second polarization unit, wherein the second polarization unit is disposed at a side of the reflection unit close to the third liquid crystal cell, or the second polarization unit is disposed at a side of the reflection unit far away from the third liquid crystal cell;
the third liquid crystal cell comprises a third liquid crystal layer, and a range of an equivalent retardation amount of a third liquid crystal in the third liquid crystal layer comprises 321 nm˜441 nm.

15. The display panel according to claim 14 , wherein the third liquid crystal cell further comprises a fifth substrate and a sixth substrate, the fifth substrate and the sixth substrate are disposed opposite to each other, the fifth substrate comprises a fifth electrode, and the sixth substrate comprises a sixth electrode, and the third liquid crystal layer is arranged between the fifth electrode and the sixth electrode; and
the fifth electrode and the sixth electrode are configured to have a third voltage difference, and a range of the third voltage difference comprises 0V˜6V.

16. The display panel according to claim 14 , wherein a transmission axis of the second polarization unit is not parallel to the transmission axis

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhong Xuan
• Bi Hongsheng
• Bi Yao
• Wang Jian
• Wang Ce
• Song Bangjun
• Li Ning
• Zhang Haoran
• Zhang Yichi
• Wu Xiaojuan
• Chen Cuiyu
• Duan Jinshuai
• Wang Jiaxing
• Zhao Yu
• Feng Dawei
• Yu Zhiqiang
• Liu Feng
• Hou Danxing
• Wang Ning

Classifications

• G02F2203/02

  reflective · CPC title

• G02F1/137

  characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering · CPC title

• 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 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/133528

  Polarisers · CPC title