Optical film and method of manufacturing the same, reflective liquid crystal display panel and display apparatus

Patent metadata

Field	Value
Publication number	US-2022382102-A1
Application number	US-202017605520-A
Country	US
Kind code	A1
Filing date	Nov 17, 2020
Priority date	Nov 17, 2020
Publication date	Dec 1, 2022
Grant date	—

Abstract

An optical film includes a polarizer. The polarizer includes a base layer, and a material of the base layer is obtained by dyeing a base material with a dye. The base material includes a polyvinyl alcohol material, and the dye is selected from blue dichroism organic dyes.

First claim

1 . An optical film, comprising:
a polarizer, the polarizer including a base layer, a material of the base layer being obtained by dyeing a base material with a dye; wherein the base material includes a polyvinyl alcohol material, and the dye is selected from blue dichroic organic dyes.

2 . The optical film according to claim 1 , wherein
the dye is an azo dye or an anthraquinone dye.

3 . The optical film according to claim 1 , wherein
a mass percentage of the dye in the base material is 0.01% to 2%.

4 . The optical film according to claim 1 , wherein
a value of a* of the polarizer in a CIE1976 L*a*b* chromaticity space is −0.19, and a value of b* of the polarizer in a CIE1976 L*a*b* chromaticity space is −2.66.

5 . The optical film according to claim 1 , wherein
the polarizer includes a first surface and a second surface opposite to each other in a thickness direction of the polarizer; the optical film further comprises a phase compensation film disposed on the first surface, the phase compensation film including at least one of a half wave (λ/2) plate or a quarter wave (λ/4) plate.

6 . The optical film according to claim 5 , further comprising a protective film disposed on the second surface.

7 . The optical film according to claim 5 , further comprising an adhesive layer disposed on a side of the phase compensation film away from the polarizer.

8 . The optical film according to claim 7 , further comprising a release film disposed on a side of the adhesive layer away from the polarizer.

9 . A reflective liquid crystal display panel, comprising:
a liquid crystal cell; and the optical film according to claim 1 .

10 . The reflective liquid crystal display panel according to claim 9 , wherein the liquid crystal cell includes a display substrate and an opposite substrate disposed opposite to each other;
the optical film is disposed on a side of the opposite substrate away from the display substrate; the optical film includes a phase compensation film, the phase compensation film is closer to the opposite substrate than the polarizer.

11 . The reflective liquid crystal display panel according to claim 9 , wherein
a* of a white picture displayed by the reflective liquid crystal display panel in a CIE1976 L*a*b* chromaticity space is less than or equal to −0.769, b* of the white picture displayed by the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space is less than or equal to 2.932.

12 . The reflective liquid crystal display panel according to claim 10 , wherein the liquid crystal cell further includes a first alignment film disposed on the display substrate and a second alignment film disposed on the opposite substrate, and a liquid crystal layer disposed between the display substrate and the opposite substrate;
the first alignment film has a first alignment angle with respect to a reference line, and the second alignment film has a second alignment angle with respect to the reference line; the first alignment angle is 100 degrees to 150 degrees; the second alignment angle is 30 degrees to 80 degrees; a retardation amount of the liquid crystal cell is 150 nm to 300 nm.

13 . The reflective liquid crystal display panel according to claim 12 , wherein a twist angle of liquid crystal modules in the liquid crystal layer is 50 degrees to 90 degrees.

14 . A display apparatus, comprising the liquid crystal display panel according to claim 9 .

15 . A method of manufacturing an optical film, wherein the optical film is applied to a reflective liquid crystal display panel including a liquid crystal cell and includes a phase compensation film and a polarizer; method comprises:
obtaining values of a* and b* of the polarizer in a CIE1976 L*a*b* chromaticity space, according to target values of a* and b* of a white picture displayed by the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space and reference values of a combination of the reflective liquid crystal display panel including the phase compensation film and the liquid crystal cell except for the polarizer in the CIE1976 L*a*b* chromaticity space; and dyeing a base material with a dye corresponding to the values of a* and b* of the polarizer to be formed in the CIE1976 L*a*b* chromaticity space to form the polarizer.

16 . The method according to claim 15 , wherein before obtaining the values of a* and b* of the polarizer in the CIE1976 L*a*b* chromaticity space, according to the target values of a* and b* of the white picture displayed by the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space and the reference values of the combination in the CIE1976 L*a*b* chromaticity space, the method further comprises:
obtaining the reference values of a* and b* of the combination in the CIE1976 L*a*b* chromaticity space, according to optical parameters of the reflective liquid crystal display panel; wherein the optical parameters of the reflective liquid crystal display panel include: an angle of an absorption axis of the polarizer, an angle of a slow axis and a retardation amount of the phase compensation film, a retardation amount of the liquid crystal cell and a twist angle of liquid crystal molecules in the liquid crystal layer.

17 . The method according to claim 16 , wherein,
obtaining the reference values of a* and b* of the combination in the CIE1976 L*a*b* chromaticity space, according to optical parameters of the reflective liquid crystal display panel, includes: obtaining simulation color coordinate values of the white picture displayed by the reflective liquid crystal display panel through simulation calculation, according to the optical parameters of the reflective liquid crystal display panel; and calculating simulation values of a* and b* of the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space, according to the simulation color coordinate values and a corresponding relationship between color coordinates of the white picture displayed by the the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space and a* and b* of the white picture displayed by the the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space; the simulation values of a* and b* of the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space being the reference values; or obtaining actual values of the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space, according to a deviation between the obtained simulation values of a* and b* of the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space by calculation and the actual values of the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space; the actual values of a* and b* of the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space being the reference values.

18 . The method according to claim 15 , wherein before obtaining the values of a* and b* of the polarizer in the CIE1976 L*a*b* chromaticity space, according to the target values of a* and b* of the white picture displayed by the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space and the reference values of the combination in the CIE1976 L*a*b* chromaticity space, the method further comprises:
obtaining target values of a* and b* of the white picture displayed by the reflective liquid crystal display panel in the CIE1976 L*a*b* chromaticity space, according to target values

Assignees

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

Inventors

• Zhong Xuan
• Yuan Hongliang
• Zheng Qi
• Bi Yao
• Wu Xiaojuan
• Zhao Zhiqiang
• Cheng Zhangxiang
• Wang Jiaxing
• Zhang Donghua
• Wang Ce

Classifications

• C09K19/601 Primary

  Azoic · CPC title

• B29K2029/04

  PVOH, i.e. polyvinyl alcohol (B29K2031/04 takes precedence) · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• B29D11/00644

  polarizing · CPC title

• G02B1/08

  made of polarising materials · CPC title