# US 10,481,436 B2 · Process for producing a phase difference control component and 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 10,481,436 B2 - Document ID: US10481436B2 - Status: Granted - Kind: B2 - Application number: 16/229,330 - Filed: 2018-12-21 - Published: 2019-04-25 - Granted: 2019-11-19 - Earliest claimed: 2004-07-07 - Assignees: Dai Nippon Printing Co., Ltd. - Applicants: Dai Nippon Printing Co., Ltd. - Inventors: Norihisa Moriya; Kanami Ikegami - Web page: https://patentgrep.com/patent/US10481436B2 ## CPC - G02F 1/13363: Birefringent elements, e.g. for optical compensation - G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)} - G02F 1/133711: {by organic films, e.g. polymeric films} - G02F 1/133788: {by light irradiation, e.g. linearly polarised light photo-polymerisation} - C09K 2323/00: Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition - C09K 2323/02: Alignment layer characterised by chemical composition - C09K 2323/03: Viewing layer characterised by chemical composition - G02F 1/133633: {using mesogenic materials} - G02F 1/133749: {for low pretilt angles, i.e. lower than 15 degrees} - 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 - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract There are provided a phase difference control component, which can realize a liquid crystal display device having a wide angle of visibility, has excellent phase difference symmetry and can realize optical compensation, and a process for producing the same. The phase difference control component comprises a base material; and a phase difference control layer formed of a fixed liquid crystal material provided on the base material through an aligning film and is characterized in that the angle of liquid crystal molecules, present at the interface of the aligning film and the phase difference control layer, to the base material being substantially 0 (zero) degree. ## Claims ### Claim 1 A phase difference control component comprising: a base material; and a phase difference control layer formed of a fixed liquid crystal material provided on said base material through a photo-aligned aligning film, wherein the photo-aligned aligning film develops a liquid crystal structure in which liquid crystal molecules, present at the interface of the photo-aligned aligning film and the phase difference control layer, are aligned at a pretilt angle of substantially 0 degree, and wherein the photo-aligned aligning film is photodimerization type formed of polyvinyl cinnamate. ### Claim 2 (depends on 1) The phase difference control component according to claim 1, wherein said phase difference control layer has positive birefringence properties and the optical axis thereof is parallel to the plane of the phase difference control layer. ### Claim 3 (depends on 1) The phase difference control component according to claim 1, wherein the retardation value of said phase difference control component representing the level of phase difference, measured by varying the observation angle in the range of −45 degrees to +45 degrees in the slow phase axis direction, is symmetrical with respect to the observation angle. ### Claim 4 (depends on 1) The phase difference control component according to claim 1, wherein the liquid crystal material comprises a three-dimensionally crosslinkable compound upon exposure to ultraviolet light selected from the group consisting of formulae (I) to (XI): ### Claim 5 (depends on 4) The phase difference control component according to claim 4, wherein said phase difference control layer has positive birefringence properties and the optical axis thereof is parallel to the plane of the phase difference control layer, and the liquid crystal material comprises one or more of the three-dimensionally crosslinkable compounds represented by formulae (I) to (XI). ### Claim 6 (depends on 4) The phase difference control component according to claim 4, wherein said phase difference control layer has positive birefringence properties and the optical axis thereof is parallel to the plane of the phase difference control layer, the liquid crystal material comprises one or more of the three-dimensionally crosslinkable compounds represented by formulae (I) to (XI), and the retardation value of said phase difference control component representing the level of phase difference, measured by varying the observation angle in the range of −45 degrees to +45 degrees in the slow phase axis direction, is symmetrical with respect to the observation angle. ### Claim 7 (depends on 1) The phase difference control component according to claim 1, wherein the base material comprises triacetylcelluloses or glass. ### Claim 8 (depends on 1) The phase difference control component according to claim 1, wherein the base material comprises triacetylcelluloses or glass, said phase difference control layer has positive birefringence properties and the optical axis thereof is parallel to the plane of the phase difference control layer. ### Claim 9 (depends on 4) The phase difference control component according to claim 4, wherein said phase difference control layer has positive birefringence properties and the optical axis thereof is parallel to the plane of the phase difference control layer, the retardation value of said phase difference control component representing the level of phase difference, measured by varying the observation angle in the range of −45 degrees to +45 degrees in the slow phase axis direction, is symmetrical with respect to the observation angle, and the liquid crystal material comprises one or more of the three-dimensionally crosslinkable compounds represented by formulae (I) to (XI). ### Claim 10 (depends on 4) The phase difference control component according to claim 4, wherein the liquid crystal material comprises one or more of the three-dimensionally crosslinkable compounds represented by formulae (I) to (XI), and the base material comprises triacetylcelluloses or glass. ### Claim 11 (depends on 4) The phase difference control component according to claim 4, wherein the phase difference control layer has positive birefringence properties and the optical axis thereof is parallel to the plane of the phase difference control layer, the liquid crystal material comprises one or more of the three-dimensionally crosslinkable compounds represented by formulae (I) to (XI), and the base material comprises triacetylcelluloses or glass. ### Claim 12 (depends on 1) The phase difference control component according to claim 1, wherein the phase difference control layer has a liquid crystal structure in which liquid crystal molecules, in a thickness direction of the phase difference control layer, have been aligned at a tilt angle of substantially 0 degree. ### Claim 13 A process for producing a phase difference control component, comprising a base material and a phase difference control layer formed of a fixed liquid crystal material provided on the base material through an aligning film, the process comprising the steps of: forming an unaligned aligning film on a base material; applying polarized light to the unaligned aligning film from the vertical direction to the base material to form a photo-aligned aligning film by a photoalignment method; providing a liquid crystal material on the photo-aligned aligning film to form a coating film; aligning the liquid crystal material in such a way that an angle of molecules of the liquid crystal material, present at an interface between the aligning film and the coating film, to the base material is substantially 0 (zero) degrees; and curing the liquid crystal material to form the phase difference control layer, wherein the photo-aligned aligning film is photodimerization type formed of polyvinyl cinnamate and the base material comprises triacetylcelluloses or glass. ### Claim 14 A display device comprising a phase difference control component, said phase difference control component comprising: a base material; and a phase difference control layer formed of a fixed liquid crystal material provided on said base material through a photo-aligned aligning film, wherein the photo-aligned aligning film develops a liquid crystal structure in which liquid crystal molecules, present at the interface of the photo-aligned aligning film and the phase difference control layer, are aligned at a pretilt angle of substantially 0 degree, and wherein the photo-aligned aligning film is photodimerization type formed of polyvinyl cinnamate. ### Claim 15 (depends on 14) The display device according to claim 14, wherein a visual light is obtainable in symmetry with respect to the observation angle. ### Claim 16 A display device comprising a phase difference control component and a color filter, said phase difference control component comprising: a base material; and a phase difference control layer formed of a fixed liquid crystal material provided on said base material through a photo-aligned aligning film, wherein the photo-aligned aligning film develops a liquid crystal structure in which liquid crystal molecules, present at the interface of the photo-aligned aligning film and the phase difference control layer, are aligned at a pretilt angle of substantially 0 degree, wherein said phase difference control component is stacked directly on the color filter in such a way that the color filter is disposed against the base material of said phase difference control component, and wherein the photo-aligned aligning film is photodimerization type formed of polyvinyl cinnamate. ### Claim 17 (depends on 14) The display device according to claim 14, wherein the base material comprises triacetylcelluloses or glass. ### Claim 18 (depends on 15) The display device according to claim 15, wherein the base material comprises triacetylcelluloses or glass. ### Claim 19 (depends on 16) The display device according to claim 16, wherein the base material comprises triacetylcelluloses or glass.