# US 9,753,328 B2 · TFT-LCD panel, method for preparing the same and TFT display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,328 B2 - Document ID: US9753328B2 - Status: Granted - Kind: B2 - Application number: 14/409,758 - Filed: 2014-05-16 - Published: 2016-09-22 - Granted: 2017-09-05 - Earliest claimed: 2013-11-11 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Yafeng Yang; Teruaki Suzuki; Jaegeon You - Web page: https://patentgrep.com/patent/US9753328B2 ## CPC - G02F 1/13363: Birefringent elements, e.g. for optical compensation - G02F 1/133305: {Flexible substrates, e.g. plastics, organic film} - G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)} - G02F 1/133528: {Polarisers} - G02F 1/1339: Gaskets; Spacers; Sealing of cells - G02F 1/1341: Filling or closing of cells - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - G02F 1/133531: {characterised by the arrangement of polariser or analyser axes} - G02F 1/133723: {Polyimide, polyamide-imide} - G02F 2202/02: organic material - G02F 2202/022: polymeric - G02F 2202/40: Materials having a particular birefringence, retardation - 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 Provided are TFT-LCD panel, method for preparing the same, and TFT display device. The TFT-LCD panel includes an upper polarizer, a positive birefringence polymer substrate, a liquid crystal layer, a negative birefringence polymer substrate and a lower polarizer, wherein the positive birefringence polymer substrate and the negative birefringence polymer substrate locate at an upper side and an lower side of the liquid crystal layer respectively, the upper polarizer locates at an upper surface of the positive birefringence polymer substrate, the lower polarizer locates at a lower surface of the negative birefringence polymer substrate; the positive birefringence polymer substrate and the negative birefringence polymer substrate are equals in a birefringence retardation in an original birefringence state, and are equals in a birefringence retardation of in the photo-elasticity birefringence state. The TFT-LCD panel of the present disclosure may avoid generating light leakage in dark, and improve homogeneity in dark. ## Claims ### Claim 1 A thin film transistor-liquid crystal display (TFT-LCD) panel, comprising an upper polarizer, a positive birefringence polymer substrate, a liquid crystal layer, a negative birefringence polymer substrate and a lower polarizer, wherein the positive birefringence polymer substrate is located at an upper side of the liquid crystal layer, the negative birefringence polymer substrate is located at a lower side of the liquid crystal layer, the upper polarizer is located at an upper surface of the positive birefringence polymer substrate, and the lower polarizer is located at a lower surface of the negative birefringence polymer substrate; a magnitude of a birefringence retardation of the positive birefringence polymer substrate in an original birefringence state is equal to a magnitude of a birefringence retardation of the negative birefringence polymer substrate in the original birefringence state, and a magnitude of a birefringence retardation of the positive birefringence polymer substrate in a photo-elasticity birefringence state is equal to a magnitude of a birefringence retardation of the negative birefringence polymer substrate in the photo-elasticity birefringence state; the positive birefringence polymer substrate comprises a positive birefringence substrate that is formed by polymerizing a monomer of a positive refractive index polymer, and the monomer of the positive refractive index polymer is 4-cinnamoylphenyl methacrylate; and the negative birefringence polymer substrate comprises a negative birefringence substrate that is formed by polymerizing a monomer of a negative refractive index polymer, and the monomer of the negative refractive index polymer is methyl methacrylate. ### Claim 2 (depends on 1) The TFT-LCD panel according to claim 1, wherein the positive birefringence polymer substrate further comprises a colored layer, a light-shielding layer and a polyimide alignment film. ### Claim 3 (depends on 1) The TFT-LCD panel according to claim 1, wherein the negative birefringence polymer substrate further comprises a TFT array and a polyimide alignment film. ### Claim 4 (depends on 1) The TFT-LCD panel according to claim 1, wherein a polarization direction of the upper polarizer is perpendicular to a polarization direction of the lower polarizer. ### Claim 5 (depends on 1) A TFT display device, comprising the TFT-LCD panel according to claim 1. ### Claim 6 (depends on 5) The TFT display device according to claim 5, wherein the positive birefringence polymer substrate further comprises a colored layer, a light-shielding layer and a polyimide alignment film. ### Claim 7 (depends on 5) The TFT display device according to claim 5, wherein the negative birefringence polymer substrate further comprises a TFT array and a polyimide alignment film. ### Claim 8 (depends on 5) The TFT display device according to claim 5, wherein a polarization direction of the upper polarizer is perpendicular to a polarization direction of the lower polarizer. ### Claim 9 A method for manufacturing a TFT-LCD panel, comprising following steps: S1: manufacturing a positive birefringence polymer substrate, polymerizing a monomer of a positive refractive index polymer to form a positive birefringence substrate; manufacturing a light-shielding layer and a colored layer on the positive birefringence substrate, and then manufacturing a polyimide alignment film by printing orientation, to form the positive birefringence polymer substrate; S2: manufacturing a negative birefringence polymer substrate, polymerizing a monomer of a negative refractive index polymer to form a negative birefringence substrate, a magnitude of a birefringence retardation of the negative birefringence substrate in an original birefringence state being equal to a magnitude of a birefringence retardation of the positive birefringence substrate in the original birefringence state, and a magnitude of a birefringence retardation of the negative birefringence substrate in a photo-elasticity birefringence state being equal to a magnitude of a birefringence retardation of the positive birefringence substrate in the photo-elasticity birefringence state; manufacturing a TFT array on the negative birefringence substrate, and manufacturing a PI alignment film by printing orientation, to form the negative birefringence polymer substrate; S3: injecting a liquid crystal between the positive birefringence polymer substrate and the negative birefringence polymer substrate, and sealing the positive birefringence polymer substrate and the negative birefringence polymer substrate by a sealant; S4: attaching an upper polarizer on an upper surface of the positive birefringence polymer substrate in S3, attaching a lower polarizer on a lower surface of the negative birefringence polymer substrate in S3, wherein a polarization direction of the upper polarizer is perpendicular to a polarization direction of the lower polarizer, to form the TFT-LCD panel, wherein the monomer of the positive refractive index polymer is 4-cinnamoylphenyl methacrylate, and wherein the monomer of the negative refractive index polymer is methyl methacrylate.