Liquid crystal display panel and driving methods therefor, and display apparatus

Patent metadata

Field	Value
Publication number	US-11899304-B2
Application number	US-202117781302-A
Country	US
Kind code	B2
Filing date	Jun 15, 2021
Priority date	Sep 30, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A liquid crystal display panel ( 100 ) comprises a first polarizer ( 110 ) and a second polarizer ( 170 ), a first liquid crystal layer ( 130 ) disposed between the first polarizer ( 110 ) and the second polarizer ( 170 ), and an optical compensation layer ( 140 ) disposed between the first liquid crystal layer ( 130 ) and one of the first polarizer ( 110 ) and the second polarizer ( 170 ). A transmission axis of the first polarizer ( 110 ) is perpendicular to a transmission axis of the second polarizer ( 170 ). The first liquid crystal layer ( 130 ) includes first liquid crystal molecules ( 130 ′). An included angle (γ) between an orthographic projection of an optical axis of a first liquid crystal molecule ( 130 ′) on the first polarizer ( 110 ), which is perpendicular to an orthographic projection of an optical axis of the optical compensation layer ( 140 ) on the first polarizer ( 110 ), and the transmission axis of the first polarizer ( 110 ) is an acute angle.

First claim

What is claimed is:

1. A liquid crystal display panel, comprising:
a first polarizer;
a second polarizer disposed opposite to the first polarizer, a transmission axis of the first polarizer being perpendicular to a transmission axis of the second polarizer;
a first liquid crystal layer disposed between the first polarizer and the second polarizer, wherein the first liquid crystal layer includes first liquid crystal molecules, and an included angle between an orthogonal projection of an optical axis of a first liquid crystal molecule on the first polarizer and the transmission axis of the first polarizer is an acute angle; and
an optical compensation layer disposed between the first liquid crystal layer and one of the first polarizer and the second polarizer; wherein an orthogonal projection of an optical axis of the optical compensation layer on the first polarizer is perpendicular to the orthogonal projection of the optical axis of the first liquid crystal molecule on the first polarizer; and
an absolute value of a difference between an in-plane retardation of the optical compensation layer and an in-plane retardation of the first liquid crystal layer is less than or equal to 30 nm.

2. The liquid crystal display panel according to claim 1 , wherein the in-plane retardation of the first liquid crystal layer is in a range of 87 nm to 263 nm, inclusive.

3. The liquid crystal display panel according to claim 1 , wherein
the in-plane retardation of the optical compensation layer is equal to the in-plane retardation of the first liquid crystal layer.

4. The liquid crystal display panel according to claim 1 , wherein the optical compensation layer is a +A compensation layer.

5. The liquid crystal display panel according to claim 1 , wherein
the included angle between the orthogonal projection of the optical axis of the first liquid crystal molecule on the first polarizer and the transmission axis of the first polarizer is in a range of 15° to 40°, inclusive, or in a range of 50° to 75°, inclusive.

6. The liquid crystal display panel according to claim 5 , wherein
the included angle between the orthogonal projection of the optical axis of the first liquid crystal molecule on the first polarizer and the transmission axis of the first polarizer is in a range of a difference between 30° and 10° to a sum of 30° and 10°, inclusive, or in a range of a difference between 60° and 10° to a sum of 60° and 10°, inclusive; or
the included angle between the orthogonal projection of the optical axis of the first liquid crystal molecule on the first polarizer and the transmission axis of the first polarizer is in a range of a difference between 25° and 10° to a sum of 25° and 10°, inclusive, or in a range of a difference between 65° and 10° to a sum of 65° and 10°, inclusive.

7. The liquid crystal display panel according to claim 1 , further comprising:
a base substrate, and a color filter layer disposed between the base substrate and the first liquid crystal layer, wherein the optical compensation layer is disposed between the color filter layer and the first liquid crystal layer; or
a base substrate, and a color filter layer disposed between the base substrate and the first liquid crystal layer, wherein the optical compensation layer is disposed between the color filter layer and the first liquid crystal layer, and the optical compensation layer is a planarization layer.

8. The liquid crystal display panel according to claim 1 , further comprising:
a first alignment film and a second alignment film that are disposed oppositely, wherein
the first alignment film is disposed on a side of the first liquid crystal layer proximate to the first polarizer, and the first alignment film is in contact with the first liquid crystal layer;
the second alignment film is disposed on a side of the first liquid crystal layer proximate to the second polarizer, and the second alignment film is in contact with the first liquid crystal layer; and
an alignment direction of the first alignment film is the same as an alignment direction of the second alignment film.

9. The liquid crystal display panel according to claim 1 , wherein,
the first liquid crystal molecules are negative liquid crystal molecules.

10. The liquid crystal display panel according to claim 1 , further comprising:
a second liquid crystal layer disposed between the first polarizer and the first liquid crystal layer or between the second polarizer and the first liquid crystal layer, the second liquid crystal layer including second liquid crystal molecules; and
at least one first control electrode and at least one second control electrode, wherein the at least one first control electrode is disposed between the first polarizer and the second liquid crystal layer, the at least one second control electrode is disposed between the second polarizer and the second liquid crystal layer, and an orthogonal projection of the at least one first control electrode on the first polarizer and an orthogonal projection of a second control electrode on the first polarizer have an overlapping region.

11. The liquid crystal display panel according to claim 10 , wherein
the second liquid crystal layer is a polymer dispersed bistable nematic liquid crystal layer having a first stable state and a second stable state, wherein
in a case where the second liquid crystal layer is in the first stable state, an orthogonal projection of an optical axis of a second liquid crystal molecule on the first polarizer is parallel to the orthogonal projection of the optical axis of the optical compensation layer on the first polarizer; and in a case where the second liquid crystal layer is in the second steady state, the second liquid crystal layer is in a scattering state.

12. The liquid crystal display panel of claim 11 , wherein the second liquid crystal layer is disposed between the first liquid crystal layer and the second polarizer;
the liquid crystal display panel further comprises at least one third control electrode, and the at least one third control electrode and the at least one first control electrode are disposed between the first liquid crystal layer and the first polarizer; one of the at least one third control electrode and the at least one first control electrode is a pixel electrode, and another thereof is a common electrode.

13. The liquid crystal display panel according to claim 10 , wherein
in a case where the liquid crystal display panel displays a non-black picture, an orthogonal projection of an optical axis of a second liquid crystal molecule on the first polarizer is parallel to the orthogonal projection of the optical axis of the optical compensation layer on the first polarizer, and an in-plane retardation of the second liquid crystal layer is in a range of 120 nm to 280 nm, inclusive.

14. The liquid crystal display panel according to claim 13 , wherein
the in-plane retardation of the second liquid crystal layer is in a range of a difference between 247 nm and 20 nm to a sum of 247 nm and 20 nm, inclusive.

15. The liquid crystal display panel according to claim 10 , wherein
the optical compensation layer is located between the first liquid crystal layer and the second liquid crystal layer.

16. A display apparatus comprising the liquid crystal display panel according to claim 1 .

17. A driving method for a liquid crystal display panel, the liquid crystal display panel is the liquid crystal display panel according to claim 10 ;
the driving method for the liquid crystal display panel comprising:
driving the liquid crystal display pa

Assignees

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

Inventors

• Wang Feifei
• Ji Lintao
• Li Bowen
• Zhan Hongming
• Wang Kaixuan
• Shao Xibin

Classifications

• G02F1/133531 Primary

  characterised by the arrangement of polariser or analyser axes · CPC title

• G02F1/1334

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

• G02F1/1391

  Bistable or multi-stable liquid crystal cells (G02F1/141 takes precedence) · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title