Display panel and display device

Patent metadata

Field	Value
Publication number	US-2023138896-A1
Application number	US-202117606581-A
Country	US
Kind code	A1
Filing date	Jan 18, 2021
Priority date	Jan 18, 2021
Publication date	May 4, 2023
Grant date	—

Abstract

A display panel and a display device are provided. The display panel includes a first base substrate; a second base substrate opposite to the first base substrate; a liquid crystal layer between the first and second base substrates; a first alignment film at a side of the first base substrate facing the liquid crystal layer; a second alignment film at a side of the second base substrate facing the liquid crystal layer; a polarizer at a side of the first base substrate away from the liquid crystal layer; and a quarter-wave plate between the polarizer and the first base substrate. An angle between a center line of an included angle between the first alignment direction of the first alignment film and the second alignment direction of the second alignment film and a slow axis of the quarter-wave plate is in a range from 75 to 105 degrees.

First claim

1 . A display panel, comprising:
a first base substrate; a second base substrate, arranged opposite to the first base substrate; a liquid crystal layer, located between the first base substrate and the second base substrate; a first alignment film, located at a side of the first base substrate facing the liquid crystal layer; a second alignment film, located at a side of the second base substrate facing the liquid crystal layer; a polarizer, located at a side of the first base substrate away from the liquid crystal layer; and a quarter-wave plate, located between the polarizer and the first base substrate, wherein the first alignment film has a first alignment direction, and the second alignment film has a second alignment direction, an angle between a center line of an included angle between the first alignment direction and the second alignment direction and a slow axis of the quarter-wave plate is in a range from 75 to 105 degrees.

2 . The display panel according to claim 1 , further comprising: a scattering film, wherein the scattering film is configured to scatter light incident thereon.

3 . The display panel according to claim 1 , further comprising: a half-wave plate located between the polarizer and the quarter-wave plate, wherein an included angle between a polarization direction of light emitted from the half-wave plate and the slow axis of the quarter-wave plate is in a range from 40 to 50 degrees.

4 . The display panel according to claim 3 , wherein an included angle between a transmission axis of the polarizer and a slow axis of the half-wave plate is in a range from 5 to 25 degrees or a range from 60 to 80 degrees.

5 . The display panel according to claim 1 , wherein the liquid crystal layer serves as a quarter-wave plate, and an included angle between a slow axis of the liquid crystal layer and the slow axis of the quarter-wave plate is in a range from 75 to 105 degrees.

6 . The display panel according to claim 1 , wherein an included angle between the first alignment direction and the second alignment direction is in a range from 48 to 58 degrees, or a range from 71 to 81 degrees.

7 . The display panel according to claim 2 , wherein the scattering film is located at a side of the first base substrate away from the liquid crystal layer.

8 . The display panel according to claim 7 , wherein the scattering film is located between the quarter-wave plate and the first base substrate.

9 . The display panel according to claim 2 , wherein the scattering film comprises a plurality of scattering units, each of the plurality of scattering units comprises a rod-like shape, and each of the plurality of scattering units comprises a first portion; an included angle between the first portion and the first base substrate is an acute angle, and an extending direction of the first portion is the same as a direction in which a reflectivity of the display panel is maximum without the scattering film.

10 . The display panel according to claim 9 , wherein each of the plurality of scattering units further comprises a second portion, and an included angle between the first portion and the second portion is greater than 90 degrees and less than 180 degrees.

11 . The display panel according to claim 10 , wherein the first portion is closer to the first base substrate than the second portion, and an included angle between the second portion and the first base substrate is larger than the included angle between the first portion and the first base substrate.

12 . The display panel according to claim 10 , wherein the included angle between the second portion and the first base substrate is an acute angle or a right angle.

13 . The display panel according to claim 12 , wherein the acute angle is greater than 0 degree and less than or equal to 15 degrees.

14 . The display panel according to claim 2 , wherein the scattering film comprises a scattering structure and a reflective element, the scattering structure and the reflective element are located on the second base substrate, the scattering structure comprises a plurality of protrusions and recessed portions located between adjacent ones of the plurality of protrusions, the scattering structure is located at a side of the second base substrate facing the first base substrate, and the reflective element is located at a side of the scattering structure away from the second base substrate, and is conformally formed on a surface of the scattering structure away from the second base substrate.

15 . The display panel according to claim 1 , further comprising: a reflective element, wherein the reflective element is located at a side of the second base substrate facing the liquid crystal layer, and the reflective element is configured to reflect light incident thereon.

16 . The display panel according to claim 15 , further comprising a first electrode on the first base substrate and a second electrode on the second base substrate, wherein the first electrode and the second electrode are configured to form an electric field to drive liquid crystal molecules in the liquid crystal layer to rotate.

17 . The display panel according to claim 16 , wherein the second electrode is also used as the reflective element.

18 . A display device, comprising the display panel according to claim 1 .

Assignees

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

Inventors

• Liu Hao
• Zhang Ruichen
• Wang Kaixuan
• Chen Yanqing
• Zhang Zhao
• Liu Yanni
• Tian Li

Classifications

• G02F1/133531

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

• G02F1/1396

  the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell (G02F1/141 takes precedence) · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F2203/02

  reflective · CPC title

• G02F1/133638 Primary

  Waveplates, i.e. plates with a retardation value of lambda/n · CPC title