# US 9,039,930 B2 · Blue phase liquid crystal display panel and fabricating method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,930 B2 - Document ID: US9039930B2 - Status: Granted - Kind: B2 - Application number: 13/854,126 - Filed: 2013-03-31 - Published: 2014-01-02 - Granted: 2015-05-26 - Earliest claimed: 2012-06-27 - Assignees: Au Optronics Corporation - Applicants: Au Optronics Corporation - Inventors: Yi-Fen Lan; Ling-Yung Wang; Pu-Jung Huang; Cheng-Yeh Tsai - Web page: https://patentgrep.com/patent/US9039930B2 ## CPC - C09K 19/0275: {Blue phase} - C09K 19/32: containing condensed ring systems, i.e. fused, bridged or spiro ring systems - C09K 19/54: Additives having no specific mesophase {characterised by their chemical composition} - G02F 1/133365: {Cells in which the active layer comprises a liquid crystalline polymer} - G02F 1/13718: {based on a change of the texture state of a cholesteric liquid crystal} - C09K 2019/0448: {the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate} - C09K 2019/122: {Ph-Ph} - C09K 2019/2078: {Ph-COO-Ph-COO-Ph} - C09K 2019/3016: {Cy-Ph-Ph} - G02F 1/13775: {Polymer-stabilized liquid crystal layers} - G02F 1/13793: {Blue phases} - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - 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 blue phase liquid crystal display panel and a fabricating method thereof are provided. A first substrate and a second substrate are provided, and then a blue phase liquid crystal composition is filled between the first substrate and the second substrate, wherein the blue phase liquid crystal composition includes a blue phase liquid crystal and a reactive monomer. Next, an irradiation process is performed to induce a polymerization reaction in the reactive monomer of the blue phase liquid crystal composition, wherein a light utilized in the irradiation process has a wavelength ranged from 200 nm to 350 nm. ## Claims ### Claim 1 A fabricating method of a blue phase liquid crystal display panel, comprising: providing a first substrate and a second substrate; filling a blue phase liquid crystal composition between the first substrate and the second substrate, wherein the blue phase liquid crystal composition comprises a blue phase liquid crystal and a reactive monomer; and performing an irradiation process to induce a polymerization reaction in the reactive monomer of the blue phase liquid crystal composition to form a polymer, wherein a light utilized in the irradiation process has a wavelength ranged from 200 nm to 350 nm. ### Claim 2 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein the wavelength of the light utilized in the irradiation process is substiantially 313 nm. ### Claim 3 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein the irradiation process further comprises utilizing a light having a wavelength ranged from 350 nm to 400 nm. ### Claim 4 (depends on 3) The fabricating method of the blue phase liquid crystal display panel according to claim 3, wherein the irradiation process comprises irradiating with the light having the wavelength ranged from 200 nm to 350 nm and irradiating with the light having the wavelength ranged from 350 nm to 400 nm simultaneously. ### Claim 5 (depends on 3) The fabricating method of the blue phase liquid crystal display panel according to claim 3, wherein the irradiation process comprises irradiating with the light having the wavelength ranged from 350 nm to 400 nm first, and then irradiating with the light having the wavelength ranged from 200 nm to 350 nm. ### Claim 6 (depends on 3) The fabricating method of the blue phase liquid crystal display panel according to claim 3, wherein the irradiation process comprises irradiating with the light having the wavelength ranged from 200 nm to 350 nm first, and then irradiating with the light having the wavelength ranged from 350 nm to 400 nm. ### Claim 7 (depends on 3) The fabricating method of the blue phase liquid crystal display panel according to claim 3, wherein a polydispersity index (PDI) of the polymer formed by the reactive monomer in the blue phase liquid crystal composition after the polymerization is larger than 1.5. ### Claim 8 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein the blue phase liquid crystal composition does not contain any photoinitiator. ### Claim 9 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein the reactive monomer in the blue phase liquid crystal composition comprises 2-ethylhexyl acrylate or a structure represented by Formula 1 or 2: ### Claim 10 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein the blue phase liquid crystal composition further comprises a photoinitiator represented by Formula 3: ### Claim 11 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein the blue phase liquid crystal in the blue phase liquid crystal composition comprises a host material and a chiral material. ### Claim 12 (depends on 11) The fabricating method of the blue phase liquid crystal display panel according to claim 11, wherein the host material comprises at least one of Formulae 4 to 7: ### Claim 13 (depends on 11) The fabricating method of the blue phase liquid crystal display panel according to claim 11, wherein the chiral material is represented by Formula 8: ### Claim 14 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein a molecular weight of the polymer in the blue phase liquid crystal composition after the polymerization is smaller than 105. ### Claim 15 (depends on 1) The fabricating method of the blue phase liquid crystal display panel according to claim 1, wherein further comprising performing a heating process simultaneously with performing the irradiation process. ### Claim 16 A blue phase liquid crystal display panel, comprising: a first substrate and a second substrate; and a blue phase liquid crystal composition disposed between the first substrate and the second substrate, the blue phase liquid crystal composition comprising a blue phase liquid crystal and a polymer formed by a polymerization of a reactive monomer, wherein a molecular weight of the polymer is smaller than 105. ### Claim 17 (depends on 16) The blue phase liquid crystal display panel according to claim 16, wherein a polydispersity index of the polymer is larger than 1.5. ### Claim 18 (depends on 16) The blue phase liquid crystal display panel according to claim 16, wherein the reactive monomer for forming the polymer comprises 2-ethylhexyl acrylate or a structure represented by Formula 1 or 2: ### Claim 19 (depends on 16) The blue phase liquid crystal display panel according to claim 16, wherein the blue phase liquid crystal comprises a host material and a chiral material. ### Claim 20 (depends on 19) The blue phase liquid crystal display panel according to claim 19, wherein the host material comprises at least one of Formulae 4 to 7: ### Claim 21 (depends on 19) The blue phase liquid crystal display panel according to claim 19, wherein the chiral material is represented by Formula 8: ### Claim 22 (depends on 16) The blue phase liquid crystal display panel according to claim 16, wherein the blue phase liquid crystal composition does not contain any photoinitiator.