# US 10,481,434 B2 · Flexible liquid crystal display panel and display device comprising first and second negative A plate compensation films and a positive C plate compensation film between a second flexible substrate and the first negative A plate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,434 B2 - Document ID: US10481434B2 - Status: Granted - Kind: B2 - Application number: 15/210,788 - Filed: 2016-07-14 - Published: 2017-07-06 - Granted: 2019-11-19 - Earliest claimed: 2016-01-04 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Qian Jia; Yingtao Wang; Weili Zhao - Web page: https://patentgrep.com/patent/US10481434B2 ## CPC - G02F 1/13363: Birefringent elements, e.g. for optical compensation - G02F 1/133305: {Flexible substrates, e.g. plastics, organic film} - G02F 1/133528: {Polarisers} - G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]} - G02F 1/133634: {the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis} - G02F 2201/121: common or background - G02F 2201/123: pixel - G02F 2202/40: Materials having a particular birefringence, retardation - G02F 2413/03: Number of plates being 3 - G02F 2413/07: All plates on one side of the LC cell - G02F 2413/13: Positive birefingence - G02F 2413/14: Negative birefingence - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A flexible liquid crystal display panel and a display device are disclosed. The flexible liquid crystal display panel comprises: a first flexible substrate and a second flexible substrate arranged oppositely; a first polarizer on a side of the first flexible substrate facing away from the second flexible substrate; a second polarizer on a side of the second flexible substrate facing away from the first flexible substrate; and a positive C plate compensation film and a first negative A plate compensation film arranged on the second flexible substrate; the positive C plate compensation film is arranged between the second flexible substrate and the first negative A plate compensation film. The light leakage defect of a visual angle greater than zero in a dark state can be overcome, which occurs since the absorption axis of the first polarizer and the absorption axis of the second polarizer are not perpendicular to each other. ## Claims ### Claim 1 A flexible liquid crystal display panel comprising: a first flexible substrate and a second flexible substrate arranged oppositely; a first polarizer arranged on a side of the first flexible substrate facing away from the second flexible substrate; a second polarizer arranged on a side of the second flexible substrate facing away from the first flexible substrate; a liquid crystal cell located between the first flexible substrate and the second flexible substrate; and a positive C plate compensation film and a first negative A plate compensation film arranged on the second flexible substrate; wherein the positive C plate compensation film, the first negative A plate compensation film and the second flexible substrate are arranged on a bottom side of the liquid crystal cell; the positive C plate compensation film is arranged between the second flexible substrate and the first negative A plate compensation film. ### Claim 2 (depends on 1) The flexible liquid crystal display panel according to claim 1, wherein the liquid crystal cell comprises a common electrode and a pixel electrode insulated from each other, which are arranged on a side of the second flexible substrate facing the first flexible substrate to generate a transverse electric field parallel to the second flexible substrate. ### Claim 3 (depends on 2) The flexible liquid crystal display panel according to claim 2, further comprising: a second negative A plate compensation film arranged between the second flexible substrate and the liquid crystal cell; the positive C plate compensation film and the first negative A plate compensation film being arranged on a side of the second flexible substrate facing away from the liquid crystal cell; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the first polarizer; an in-plane retardation of the first negative A plate compensation film is between −80 nm to −100 nm; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2320 nm to 2380 nm; wherein an optic axis of the second negative A plate compensation film is parallel to an absorption axis of the second polarizer; an in-plane retardation of the second negative A plate compensation film is between −80 nm to −100 nm. ### Claim 4 (depends on 2) The flexible liquid crystal display panel according to claim 2, wherein the positive C plate compensation film and the first negative A plate compensation film are arranged on a side of the second flexible substrate facing away from the liquid crystal cell; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2360 nm to 2440 nm; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the first polarizer; an in-plane retardation of the first negative A plate compensation film is between −120 nm to −150 nm. ### Claim 5 (depends on 2) The flexible liquid crystal display panel according to claim 2, wherein the positive C plate compensation film and the first negative A plate compensation film are arranged between the second flexible substrate and the liquid crystal cell; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2400 nm to 2450 nm; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the second polarizer; an in-plane retardation of the first negative A plate compensation film is between −120 nm to −160 nm. ### Claim 6 (depends on 2) The flexible liquid crystal display panel according to claim 2, further comprising: a positive A plate compensation film arranged between the second flexible substrate and the second polarizer; the positive C plate compensation film and the first negative A plate compensation film being arranged between the second flexible substrate and the liquid crystal cell; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2450 nm to 2520 nm; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the second polarizer; an in-plane retardation of the first negative A plate compensation film is between −80 nm to −110 nm; wherein an optic axis of the positive A plate compensation film is parallel to an absorption axis of the first polarizer; an in-plane retardation of the positive A plate compensation film is between 50 nm to 90 nm. ### Claim 7 (depends on 1) The flexible liquid crystal display panel according to claim 1, wherein an optic axis of the second flexible substrate is perpendicular to a surface of the second flexible substrate. ### Claim 8 (depends on 1) The flexible liquid crystal display panel according to claim 1, wherein a material of the first flexible substrate is flexible glass. ### Claim 9 (depends on 1) The flexible liquid crystal display panel according to claim 1, wherein a material of the second flexible substrate is organic resin. ### Claim 10 (depends on 9) The flexible liquid crystal display panel according to claim 9, wherein a material of the second flexible substrate is polyimide. ### Claim 11 (depends on 1) A display device comprising the flexible liquid crystal display panel according to claim 1. ### Claim 12 (depends on 11) The display device according to claim 11, wherein the liquid crystal cell comprises a common electrode and a pixel electrode insulated from each other, which are arranged on a side of the second flexible substrate facing the first flexible substrate to generate a transverse electric field parallel to the second flexible substrate. ### Claim 13 (depends on 12) The display device according to claim 12, further comprising: a second negative A plate compensation film arranged between the second flexible substrate and the liquid crystal cell; the positive C plate compensation film and the first negative A plate compensation film being arranged on a side of the second flexible substrate facing away from the liquid crystal cell; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the first polarizer; an in-plane retardation of the first negative A plate compensation film is between −80 nm to −100 nm; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2320 nm to 2380 nm; wherein an optic axis of the second negative A plate compensation film is parallel to an absorption axis of the second polarizer; an in-plane retardation of the second negative A plate compensation film is between −80 nm to −100 nm. ### Claim 14 (depends on 12) The display device according to claim 12, wherein the positive C plate compensation film and the first negative A plate compensation film are arranged on a side of the second flexible substrate facing away from the liquid crystal cell; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2360 nm to 2440 nm; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the first polarizer; an in-plane retardation of the first negative A plate compensation film is between −120 nm to −150 nm. ### Claim 15 (depends on 12) The display device according to claim 12, wherein the positive C plate compensation film and the first negative A plate compensation film are arranged between the second flexible substrate and the liquid crystal cell; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2400 nm to 2450 nm; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the second polarizer; an in-plane retardation of the first negative A plate compensation film is between −120 nm to −160 nm. ### Claim 16 (depends on 12) The display device according to claim 12, further comprising: a positive A plate compensation film arranged between the second flexible substrate and the second polarizer; the positive C plate compensation film and the first negative A plate compensation film being arranged between the second flexible substrate and the liquid crystal cell; wherein an optic axis of the positive C plate compensation film is perpendicular to a surface of the second flexible substrate; an in-plane retardation of the positive C plate compensation film is between 2450 nm to 2520 nm; wherein an optic axis of the first negative A plate compensation film is parallel to an absorption axis of the second polarizer; an in-plane retardation of the first negative A plate compensation film is between −80 nm to −110 nm; wherein an optic axis of the positive A plate compensation film is parallel to an absorption axis of the first polarizer; an in-plane retardation of the positive A plate compensation film is between 50 nm to 90 nm. ### Claim 17 (depends on 11) The display device according to claim 11, wherein an optic axis of the second flexible substrate is perpendicular to a surface of the second flexible substrate. ### Claim 18 (depends on 11) The display device according to claim 11, wherein a material of the first flexible substrate is flexible glass. ### Claim 19 (depends on 11) The display device according to claim 11, wherein a material of the second flexible substrate is organic resin. ### Claim 20 (depends on 19) The display device according to claim 19, wherein a material of the second flexible substrate is polyimide.