# US 11,309,616 B2 · Tunable band-stop filter, method of driving the same and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,616 B2 - Document ID: US11309616B2 - Status: Granted - Kind: B2 - Application number: 16/496,626 - Filed: 2019-02-25 - Published: 2021-12-30 - Granted: 2022-04-19 - Earliest claimed: 2018-06-08 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Yongchun Lu - Web page: https://patentgrep.com/patent/US11309616B2 ## CPC - H01P 1/20327: {Electromagnetic interstage coupling} - H01P 1/2039: {Galvanic coupling between Input/Output} - G02F 1/1313: {specially adapted for a particular application} - G02F 1/1337: Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers - G02F 1/216: {using liquid crystals, e.g. liquid crystal Fabry-Perot filters} - G02F 2203/50: Phase-only modulation - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - 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 tunable band-stop filter, a method of driving a tunable band-stop filter and an electronic device are provided. The tunable band-stop filter includes a first substrate, a second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate. The first substrate includes a wire structure on a first base substrate, the second substrate includes a common electrode on a second base substrate. The wire structure includes a first wire structure and a second wire structure. The first wire structure, the common electrode, and the liquid crystal layer between the first wire structure and the common electrode constitute a first phase modulation structure, and the second wire structure, the common electrode, and the liquid crystal layer between the second wire structure and the common electrode constitute a second phase modulation structure. ## Claims ### Claim 1 A tunable band-stop filter, comprising: a first substrate comprising a first base substrate and a wire structure on the first base substrate; a second substrate comprising a second base substrate and a common electrode on the second base substrate; and a liquid crystal layer between the first substrate and the second substrate, wherein the wire structure comprises a first wire structure and a second wire structure, and a first endpoint of the first wire structure is connected to a first endpoint of the second wire structure, a second endpoint of the first wire structure is connected to a second endpoint of the second wire structure, the first endpoint of the first wire structure and the first endpoint of the second wire structure are configured to input electromagnetic wave signals, the second endpoint of the first wire structure and the second endpoint of the second wire structure are connected and configured to output the electromagnetic wave signals, the first wire structure, the common electrode and a liquid crystal layer between the first wire structure and the common electrode constitute a first phase modulation structure, and the second wire structure, the common electrode and a liquid crystal layer between the second wire structure and the common electrode constitute a second phase modulation structure. ### Claim 2 (depends on 1) The tunable band-stop filter according to claim 1, wherein the first substrate comprises a wire arranged on the first base substrate, and the wire is connected end to end to form the wire structure. ### Claim 3 (depends on 2) The tunable band-stop filter according to claim 2, wherein the wire is a bent wire. ### Claim 4 (depends on 3) The tunable band-stop filter according to claim 3, wherein the wire is a serpentine bent wire. ### Claim 5 (depends on 4) The tunable band-stop filter according to claim 4, wherein the first phase modulation structure and the second phase modulation structure are configured to modulate phases of electromagnetic wave signals input from the first endpoint of the first wire structure and the first endpoint of the second wire structure, respectively, to allow a phase of an electromagnetic wave having a filtering frequency range among electromagnetic wave signals modulated by the first phase modulation structure to be opposite to a phase of an electromagnetic wave having the filtering frequency range among electromagnetic wave signals modulated by the second phase modulation structure. ### Claim 6 (depends on 5) The tunable band-stop filter according to claim 5, wherein the second phase modulation structure is configured to change a phase of an electromagnetic wave having the filtering frequency range among the electromagnetic wave signals by 90 degrees, and the first phase modulation structure is configured to change a phase of an electromagnetic wave having the filtering frequency range among the electromagnetic wave signals by 270 degrees. ### Claim 7 (depends on 6) The tunable band-stop filter according to claim 6, wherein a wire length of a first wire structure in the first phase modulation structure is three times a wire length of a second wire structure in the second phase modulation structure. ### Claim 8 (depends on 7) The tunable band-stop filter according to claim 7, wherein the first wire structure comprises three sub-first wire structures, and wire lengths of the three sub-first wire structures are equal to each other. ### Claim 9 (depends on 8) The tunable band-stop filter according to claim 8, wherein the wire is further configured to apply a drive voltage to form a bias electric field with the common electrode, to change a dielectric constant of the liquid crystal layer between the wire and the common electrode. ### Claim 10 (depends on 9) The tunable band-stop filter according to claim 9, further comprising: a bias voltage source, electrically connected to the wire and configured to apply the drive voltage to the wire. ### Claim 11 (depends on 10) The tunable band-stop filter according to claim 10, further comprising: a first signal line connected to the first endpoint of the first wire structure and the first endpoint of the second wire structure; and a second signal line connected to the second endpoint of the first wire structure and the second endpoint of the second wire structure. ### Claim 12 (depends on 11) The tunable band-stop filter according to claim 11, further comprising: a first alignment film arranged on a surface of the first substrate near the liquid crystal layer; and a second alignment film arranged on a surface of the second substrate near the liquid crystal layer, wherein the first alignment film and the second alignment film are configured to align liquid crystal molecules in the liquid crystal layer. ### Claim 13 (depends on 12) The tunable band-stop filter according to claim 12, further comprising: microspheres provided in the liquid crystal layer and configured to support a space between the first base substrate and the second base substrate. ### Claim 14 (depends on 13) The tunable band-stop filter according to claim 13, wherein the liquid crystal comprises nematic liquid crystal. ### Claim 15 (depends on 1) A method of driving the tunable band-stop filter according to claim 1, comprising: applying a drive voltage to the wire to change a dielectric constant of a liquid crystal layer between a wire and the common electrode; and controlling a magnitude of the drive voltage to adjust a filtering frequency range of the tunable band-stop filter. ### Claim 16 (depends on 1) An electronic device, comprising the tunable band-stop filter according to claim 1. ### Claim 17 (depends on 1) The tunable band-stop filter according to claim 1, wherein the first phase modulation structure and the second phase modulation structure are configured to modulate phases of electromagnetic wave signals input from the first endpoint of the first wire structure and the first endpoint of the second wire structure, respectively, to allow a phase of an electromagnetic wave having a filtering frequency range among electromagnetic wave signals modulated by the first phase modulation structure to be opposite to a phase of an electromagnetic wave having the filtering frequency range among electromagnetic wave signals modulated by the second phase modulation structure. ### Claim 18 (depends on 17) The tunable band-stop filter according to claim 17, wherein the second phase modulation structure is configured to change a phase of an electromagnetic wave having the filtering frequency range among the electromagnetic wave signals by 90 degrees, and the first phase modulation structure is configured to change a phase of an electromagnetic wave having the filtering frequency range among the electromagnetic wave signals by 270 degrees. ### Claim 19 (depends on 2) The tunable band-stop filter according to claim 2, wherein the first phase modulation structure and the second phase modulation structure are configured to modulate phases of electromagnetic wave signals input from the first endpoint of the first wire structure and the first endpoint of the second wire structure, respectively, to allow a phase of an electromagnetic wave having a filtering frequency range among electromagnetic wave signals modulated by the first phase modulation structure to be opposite to a phase of an electromagnetic wave having the filtering frequency range among electromagnetic wave signals modulated by the second phase modulation structure. ### Claim 20 (depends on 19) The tunable band-stop filter according to claim 19, wherein the second phase modulation structure is configured to change a phase of an electromagnetic wave having the filtering frequency range among the electromagnetic wave signals by 90 degrees, and the first phase modulation structure is configured to change a phase of an electromagnetic wave having the filtering frequency range among the electromagnetic wave signals by 270 degrees.