# US 9,753,329 B2 · Liquid crystal display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,329 B2 - Document ID: US9753329B2 - Status: Granted - Kind: B2 - Application number: 14/303,248 - Filed: 2014-06-12 - Published: 2015-06-18 - Granted: 2017-09-05 - Earliest claimed: 2013-12-18 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Ji-Hoon Kim; Daewon Kim; Seungbeom Park; Seunghee Lee; Yun Jang - Web page: https://patentgrep.com/patent/US9753329B2 ## CPC - 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 2413/02: Number of plates being 2 - G02F 2413/07: All plates on one side of the LC cell - 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 liquid crystal display apparatus includes a liquid crystal display panel including an array substrate, an opposite substrate and a liquid crystal layer, a first polarizing plate disposed on an outer surface of the array substrate and including a first transmission axis, a second polarizing plate disposed on an outer surface of the opposite substrate and including a second transmission axis, a phase difference film disposed between the second polarizing plate and the liquid crystal layer, and a backlight unit providing light to the first polarizing plate. The phase difference film has an in-plane retardation value of about 120 nm to about 150 nm and a thickness retardation value of about 240 nm to about 300 nm. ## Claims ### Claim 1 A liquid crystal display apparatus comprising: a liquid crystal display panel comprising an array substrate comprising a thin film transistor, an opposite substrate facing to the array substrate, and a liquid crystal layer disposed between the array substrate and the opposite substrate, the liquid crystal layer comprising homeotropically aligned liquid crystal molecules; a first polarizing plate disposed on an outer surface of the array substrate, the first polarizing plate having a first transmission axis; a second polarizing plate disposed on an outer surface of the opposite substrate, the second polarizing plate including a second transmission axis perpendicular to the first transmission axis; a phase difference film disposed between the second polarizing plate and the liquid crystal layer, the phase difference film having an in-plane retardation value in a range of about 120 nm to about 150 nm and a thickness retardation value in a range of about 240 nm to about 300 nm; and a backlight unit providing light to the first polarizing plate, wherein the phase difference film comprises: an A-plate; and a negative C-plate, wherein an in-plane retardation value of the A-plate is in a range of about 120 nm to about 150 nm, and wherein a thickness retardation value of the negative C-plate is in a range of about 190 nm to about 210 nm. ### Claim 2 (depends on 1) The liquid crystal display apparatus of claim 1, wherein a thickness retardation value of the A-plate is in a range of about 60 nm to about 75 nm. ### Claim 3 (depends on 1) The liquid crystal display apparatus of claim 1, wherein an in-plane retardation value of the negative C-plate is zero. ### Claim 4 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the A-plate is disposed between the negative C-plate and the second polarizing plate. ### Claim 5 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the negative C-plate is disposed between the A-plate and the second polarizing plate. ### Claim 6 (depends on 1) The liquid crystal display apparatus of claim 1, wherein at least one of the A-plate and the negative C-plate exhibits reverse wavelength dispersion. ### Claim 7 A liquid crystal display apparatus comprising: a liquid crystal display panel comprising an array substrate comprising a thin film transistor, an opposite substrate facing to the array substrate, and a liquid crystal layer disposed between the array substrate and the opposite substrate, the liquid crystal layer comprising homeotropically aligned liquid crystal molecules; a first polarizing plate disposed on an outer surface of the array substrate, the first polarizing plate having a first transmission axis; a second polarizing plate disposed on an outer surface of the opposite substrate, the second polarizing plate including a second transmission axis perpendicular to the first transmission axis; a phase difference film disposed between the second polarizing plate and the liquid crystal layer, the phase difference film having an in-plane retardation value in a range of about 120 nm to about 150 nm and a thickness retardation value in a range of about 240 nm to about 300 nm; and a backlight unit providing light to the first polarizing plate, wherein the phase difference film comprises: a biaxial film; and a negative C-plate, wherein an in-plane retardation value of the biaxial film is in a range of about 120 nm to about 150 nm, and wherein a thickness retardation value of the negative C-plate is in a range of about 190 nm to 210 nm. ### Claim 8 (depends on 7) The liquid crystal display apparatus of claim 7, wherein a thickness retardation value of the biaxial film is in a range of about 60 nm to about 80 nm, and wherein an in-plane retardation value of the negative C-plate is zero. ### Claim 9 (depends on 7) The liquid crystal display apparatus of claim 7, wherein the negative C-plate is disposed between the biaxial film and the second polarizing plate. ### Claim 10 (depends on 7) The liquid crystal display apparatus of claim 7, wherein the biaxial film is disposed between the negative C-plate and the second polarizing plate. ### Claim 11 (depends on 7) The liquid crystal display apparatus of claim 7, wherein at least one of the biaxial film and the negative C-plate exhibits reverse wavelength dispersion. ### Claim 12 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the first polarizing plate comprises a zero-retarder. ### Claim 13 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the array substrate further comprises a color filter. ### Claim 14 (depends on 1) The liquid crystal display apparatus of claim 1, wherein the liquid crystal display panel further comprises a black matrix covering the transistor. ### Claim 15 (depends on 14) The liquid crystal display apparatus of claim 14, wherein the liquid crystal display panel further comprises a column spacer disposed between the array substrate and the opposite substrate. ### Claim 16 (depends on 15) The liquid crystal display apparatus of claim 15, wherein the column spacer is opaque.