# US 2012/0236233 A1 · Va-mode liquid-crystal display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0236233 A1 - Document ID: US20120236233A1 - Status: Published application - Kind: A1 - Application number: 13/512,560 - Filed: 2010-11-29 - Published: 2012-09-20 - Earliest claimed: 2009-11-30 - Assignees: FUJIFILM Corporation - Inventors: Makoto Ishiguro - Web page: https://patentgrep.com/patent/US20120236233A1 ## CPC - G02F 1/1393: {the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence)} - G02F 1/13363: Birefringent elements, e.g. for optical compensation - G02B 5/3008: {comprising dielectric particles, e.g. birefringent crystals embedded in a matrix} - G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)} - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A VA-mode liquid-crystal display device comprising a front-side polarizing element, a rear-side polarizing element, a VA-mode liquid-crystal cell disposed between the front-side polarizing element and the rear-side polarizing element, and a rear-side retardation region composed of one or more retardation layers disposed between the rear-side polarizing element and the VA-mode liquid-crystal is disclosed. In the device, the cell satisfies following formulas (1) and (2); and the rear-side retardation region satisfies following formula (3); (1) 3.0≦{the member CR(front)/the member CR(rear)}; (2) the front-member scattering intensity≦1/38000; (3) 25 nm≦Rth(550)≦90 nm. ## Claims ### Claim 1 A VA-mode liquid-crystal display device comprising: a front-side polarizing element, a rear-side polarizing element, a VA-mode liquid-crystal cell disposed between the front-side polarizing element and the rear-side polarizing element, and a rear-side retardation region composed of one or more retardation layers disposed between the rear-side polarizing element and the VA-mode liquid-crystal cell, wherein: the liquid-crystal cell comprises a liquid-crystal layer, and a pair of a front-side substrate and a rear-side substrate to hold the liquid-crystal layer therebetween; the ratio of the member contrast ratio of the front-side substrate (the member CR(front)) to the member contrast ratio of the rear-side substrate (the member CR(rear)), (the member CR(front)/the member CR(rear)) satisfies following formula (1): 3.0≦{the member CR(front)/the member CR(rear)}; (1) the total scattering intensity of the front-side substrate and all the members formed on the front-side substrate (hereinafter this is referred to as “the front-member scattering intensity”) satisfies the following formula (2): The front-member scattering intensity≦1/38000; (2) wherein the front-member scattering intensity is the difference between the reciprocal of the contrast ratio of all the substrate and all the members formed on the substrate, as measured by the use of a polarizing plate 2 of a combination of a high-retardation film and a polarizing element (the member CR(front 2)), and the reciprocal of the contrast ratio thereof, as measured by the use of a polarizing plate 1 of a combination of a low-retardation film and a polarizing element (member CR(front 1)), and this is computed according to the following formula: The front-member scattering intensity={1/The member CR(front 2)−1/The member CR(front 1)}; and the rear-side retardation region satisfies the following formula (3): 25 nm≦Rth(550)≦90 nm (3) wherein Rth(λ) means retardation along the thickness-direction (nm) at a wavelength λ nm. ### Claim 2 (depends on 1) The VA-mode liquid-crystal display device of claim 1, wherein the rear-side retardation region satisfies following formula (4): |Re(550)≦20 nm (4) wherein Re(λ) means retardation in plane (nm) at a wavelength λ nm. ### Claim 3 (depends on 1) The VA-mode liquid-crystal display device of claim 1, which further comprises a front-side retardation region composed of one or more retardation layers disposed between the front-side polarizing element and the VA-mode liquid-crystal cell, and wherein the front-side retardation region satisfies following formulae (5) and (6): 30 nm≦Re(550)≦90 nm, and (5) 170 nm≦Rth(550)≦300 nm. (6) ### Claim 4 (depends on 1) The VA-mode liquid-crystal display device of claim 1, wherein the rear-side retardation region satisfies the following two formulae: |Rth(450)|/|Rth(550)≦1, and 1≦|Rth(630)|/|Rth(550)|. ### Claim 5 (depends on 1) The VA-mode liquid-crystal display device of claim 1, wherein the rear-side retardation region is formed of a cellulose acylate-base film or comprises a cellulose acylate-base film. ### Claim 6 (depends on 1) The VA-mode liquid-crystal display device of claim 1, wherein the rear-side retardation region is formed of an acryl-base polymer film or comprises an acryl-base polymer film. ### Claim 7 (depends on 6) The VA-mode liquid-crystal display device of claim 6, wherein the rear-side retardation region is formed of an acryl-base polymer film comprising an acryl-base polymer having at least one unit selected from lactone ring units, maleic anhydride units and glutaric anhydride units, or comprises the acryl-base polymer film. ### Claim 8 (depends on 1) The VA-mode liquid-crystal display device of claim 1 wherein the rear-side retardation region is formed of a cyclic olefin-base polymer film or comprises a cyclic olefin-base polymer film. ### Claim 9 (depends on 1) The VA-mode liquid-crystal display device of claim 1 wherein the front-side retardation region is formed of one biaxial polymer film or comprises one biaxial polymer film. ### Claim 10 (depends on 1) The VA-mode liquid-crystal display device of claim 1, wherein the front-side retardation region comprises one monoaxial polymer film. ### Claim 11 (depends on 9) The VA-mode liquid-crystal display device of claim 9, wherein one biaxial polymer film is a cellulose acylate-base film or a cyclic olefin-base polymer film. ### Claim 12 (depends on 10) The VA-mode liquid-crystal display device of claim 10, wherein one monoaxial polymer film is a cellulose acylate-base film or a cyclic olefin-base polymer film. ### Claim 13 (depends on 1) The VA-mode liquid-crystal display device of claim 1, of which the front contrast ratio is equal to or higher than 1500. ### Claim 14 (depends on 1) The VA-mode liquid-crystal display device of claim 1, which comprises a backlight unit sequentially emitting independent three primary colors and which is driven according to a field sequential driving system.