[go: up one dir, main page]

WO2024253820A1 - Qualité et stabilité d'alignement de cristaux liquides améliorées - Google Patents

Qualité et stabilité d'alignement de cristaux liquides améliorées Download PDF

Info

Publication number
WO2024253820A1
WO2024253820A1 PCT/US2024/029674 US2024029674W WO2024253820A1 WO 2024253820 A1 WO2024253820 A1 WO 2024253820A1 US 2024029674 W US2024029674 W US 2024029674W WO 2024253820 A1 WO2024253820 A1 WO 2024253820A1
Authority
WO
WIPO (PCT)
Prior art keywords
silane
amount
mixture
display
nematic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/US2024/029674
Other languages
English (en)
Inventor
Hemasiri K. Vithana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Snap Inc
Original Assignee
Snap Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US18/664,986 external-priority patent/US12399402B2/en
Application filed by Snap Inc filed Critical Snap Inc
Publication of WO2024253820A1 publication Critical patent/WO2024253820A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G02F1/133719—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films with coupling agent molecules, e.g. silane
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K2019/528—Surfactants
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition

Definitions

  • the present disclosure relates generally to display devices and more particularly to nematic liquid crystal and chiral nematic liquid crystal spatial light modulators.
  • Liquid crystal spatial light modulators for imaging applications include SLMs that use ferroelectric liquid crystals, SLMs that use nematic liquid crystals, and SLMs that use chiral nematic liquid crystals.
  • the liquid crystal in the nematic types can have positive or negative dielectric anisotropies.
  • SLMs using nematic liquid crystals or chiral nematic liquid crystals with a negative dielectric anisotropy use electro-optic modes, which include the vertically aligned nematic (VAN) display mode and the twisted vertically aligned nematic (TVAN) display mode and typically have higher contrast ratios.
  • VAN vertically aligned nematic
  • TVAN twisted vertically aligned nematic
  • TVAN optical mode has the highest contrast ratio and is preferred for projection applications and near-to-eye applications, such as in mixed reality (MR) (e.g., augmented reality and virtual reality) headsets.
  • MR mixed reality
  • TVAN optical modes are described in US Patent No.s 8,724,059 and 9,551,901, which are incorporated herein by reference.
  • SLMs using nematic liquid crystals or chiral nematic liquid crystals with a negative dielectric anisotropy operating in a VAN or TVAN display mode, present various technical problems.
  • Fast switching speed, high brightness, high contrast, and low power consumption are all desirable operating properties that require use of specific LC materials and specific SLM designs, some of which present sensitivities and instabilities that may reduce the reliability or robustness of the display.
  • FIG. 1 illustrates a method for manufacturing a liquid crystal (LC) display, in accordance with some examples.
  • FIG. 2 illustrates a general molecular structure of an example silane molecule, in accordance with some examples.
  • FIG. 3 illustrates a graph of the fall time of an LC display against the cell gap width of the display for a baseline LC mixture and a 1% silane LC mixture, in accordance with some examples.
  • FIG. 4 illustrates display stability in a powered mode and an unpowered mode over a time course of 24 and 168 hours for a baseline LC mixture, in accordance with some examples.
  • FIG. 5 illustrates display stability in a powered mode and an unpowered mode over the time course of FIG. 4 for a 1% silane LC mixture, in accordance with some examples.
  • FIG. 6 illustrates display transition from a nematic phase to an isotropic phase over a temperature course of 98C to 103C for a baseline LC mixture, in accordance with some examples.
  • FIG. 7 illustrates display transition from a nematic phase to an isotropic phase over a temperature course of 98C to 103C for a 1% silane LC mixture, in accordance with some examples.
  • FIG. 8 illustrates display transition from an isotropic phase to a nematic phase over a temperature course of 105C to 95C for a baseline LC mixture, in accordance with some examples.
  • FIG. 9 illustrates display transition from an isotropic phase to a nematic phase over a temperature course of 105C to 95C for a 1% silane LC mixture, in accordance with some examples.
  • LC display manufacturing methods, LC mixtures, and LC displays are provided that may provide improved LC alignment quality and stability relative to conventional techniques or conditions.
  • An amount of a silane material is mixed with an amount of an LC material to produce an LC mixture containing a relatively large concentration of the silane material, such as (in various examples) greater than 0.8%, between 0.8% and 1.2%, or approximately 1% silane material.
  • the silane material bonds to surfaces of a display substrate and thereby creates a layer of silane material between the substrate and the LC material, such that the silane material acts as a surfactant.
  • the amount of the silane material may be selected to ensure that the silane material bonds to the surfaces of the substrate and does not leave an excess amount of silane material mixed with the LC material, even though such excess silane material may not have a material effect on the operation of the LC material at low concentrations.
  • the silane material may, in some examples, include or constitute one or more of the following: an n-octadecyldimethylmethoxy silane, an n- octadecylmethyldimethoxy silane, an n-octadecyltrimethoxy silane, an n- octadecylmethyldi ethoxy silane, an n-octadecyltriethoxyl silane, an octadecydimethyl(3-trimethoxysilyil-propyl)ammonium chloride, a 1,2- bis(trimethoxysilyl)decane, or a l-n-decyl-l,l,3,3,3-pentamethoxy-l,3- disilapropane.
  • a silane material at the specified concentrations may exhibit one or more beneficial effects.
  • some optical applications such as near-to-eye mixed reality displays
  • the need for a fast switching speed may require the use of a display having a narrow or thin cell gap.
  • These optical applications may also require relatively high brightness and contrast.
  • an LC material having a high birefringence may need to be used to form the LC display.
  • the LC display may need to operate in a vertically aligned nematic (VAN) display mode, or even more advantageously with respect to contrast, a twisted vertically aligned nematic (TVAN) display mode.
  • VAN vertically aligned nematic
  • TVAN twisted vertically aligned nematic
  • the LC molecules are aligned nearly perpendicular to the substrate surfaces, with a twist.
  • a display may need to exhibit a switching speed of, e.g., ⁇ 500 psec in order to avoid any color bleeding and motion defects.
  • the display may need to have a cell gap of approximately 0.8 to 1.1 pm.
  • the LC material in the display may need to exhibit LC birefringence of, e.g., > 0.19. If a thinner cell gap and/or a lower birefringence is used, brightness can be increased by increasing the LED current, but this will result in greater power consumption.
  • an LC display designed to satisfy these requirements may be implemented using a TVAN optical mode, with a thin cell gap, and using LC material with a high birefringence.
  • high birefringent LC materials with negative dielectric anisotropy may present technical problems. It may be difficult to achieve LC alignment with good uniformity.
  • Some high birefringent LC materials with negative dielectric anisotropy have relatively low environmental stability: they are unstable against, e.g., extremes of humidity and/or temperature.
  • such LC materials tend to have low anchoring transition temperatures, such that the alignment of the LC material changes with increasing temperature.
  • An anchoring transition temperature is the temperature at which the LC molecules change their alignment configuration, e.g., from nearly perpendicular to a display substrate to nearly parallel to the display substrate.
  • Various examples attempt to address one or more of these technical problems by adding a surfactant material to the LC material.
  • a surfactant tends to reduce the surface tension of a liquid in which it is dissolved.
  • the surfactant material added to the LC material may act to modify properties of the surfaces it comes in contact with, thereby potentially addressing one or more of the technical problems identified above.
  • the surfactant material may be selected based on an ability of the surfactant material to chemically bond on to a desired surface, e.g., a surface of a display substrate used to contain the LC material of the LC display.
  • a silane material such as a long chain silane
  • Various other factors may also be considered in selecting a suitable silane. First, it may be desirable for the silane to have a long alkyl chain, to promote or improve the quality of the desired LC alignment (e.g., nearly perpendicular alignment). This may in turn elevate the anchoring transition temperature.
  • the silane may be very hydrophobic or moisture repellent in order to improve environmental stability.
  • silanes include an n- octadecyldimethylmethoxy silane, an n-octadecylmethyldimethoxy silane, an n-octadecyltrimethoxy silane, an n-octadecylmethyldiethoxy silane, an n- octadecyltriethoxyl silane, an octadecydimethyl(3 -trimethoxy silyil- propyl)ammonium chloride, a l,2-bis(trimethoxysilyl)decane, and a 1-n- decyl- 1,1, 3, 3, 3 -pentamethoxy- 1,3-disilapropane.
  • an LC mixture incorporating a relatively large concentration (e.g., 1%) of a highly hydrophobic silane (such as those identified above) may be used to effectively coat alignment layers and bond with substrate surfaces of the LC display, and may be particularly effective in the manufacture of very small LC displays, such as LC displays on the order of 1 cm square in area.
  • Such displays which may be used for demanding optical applications such as near-to-eye mixed reality displays, may have very small cell gaps (e.g., on the order of 1 pm) and may require high brightness, high contrast, and fast switching time to effectively project a full-color, high-quality moving image to a viewer.
  • FIG. 1 shows operations of a method 100 for manufacturing a liquid crystal (LC) display.
  • the LC display is or includes a spatial light modulator configured to operate in a vertically aligned nematic (VAN) display mode.
  • the LC display is or includes a spatial light modulator configured to operate in a twisted vertically aligned nematic (TVAN) display mode.
  • example method 100 depicts a particular sequence of operations, the sequence may be altered without departing from the scope of the present disclosure. For example, some of the operations depicted may be performed in parallel or in a different sequence that does not materially affect the function of the method 100. In other examples, different components of an example device or system that implements the method 100 may perform functions at substantially the same time or in a specific sequence.
  • an LC material is obtained.
  • the LC material is or includes a nematic LC material with a negative dielectric anisotropy.
  • an amount of the LC material to be used in the LC display is determined.
  • the amount of LC material to be used in the LC display is typically dictated by the structural design of the LC display.
  • a silane material to be mixed with the LC material is determined.
  • various factors may be taken into account in this determination: e.g., when the LC material is a nematic LC material with a negative dielectric anisotropy, the factors to be taken into account may include an ability of the silane material to chemically bond on to a desired surface, the length of an alkyl chain of the silane material, the hydrophobic or moisture repellent properties of the silane material, the tendency of the silane material to not alter the electro-optic performance of the display, etc.
  • the molecular structure of the silane material includes two major components.
  • the molecules of the silane material include a silane pendant group attached to a silicon (Si) atom, which chemically binds the silane molecule to the surfaces of the display substrate.
  • the molecules of the silane material include an alkyl chain attached to the silicon atom.
  • Silane pendant groups in these silane molecules may consist of one or more OCH3 groups or OC2H5 groups. If the number of pendant groups is less than three, then the rest of the bonds of the Si atom may have CH2 groups attached to them.
  • the alkyl chain may consist of a chain of CH2 groups, wherein the last group is a CH3 group.
  • the length of the alkyl chain is defined by the number of carbon (C) atoms in the alkyl chain; the longer the length of the alkyl chain, the higher the hydrophobicity of the display substrate surface after bonding with the corresponding silane.
  • the silane material may have silane molecules having one or more silane pendant groups and an alkyl chain length of 8 or more carbon atoms.
  • FIG. 2, described below, shows the general molecular structure of an example silane molecule.
  • the selected silane material may include an n- octadecyldimethylmethoxy silane, an n-octadecylmethyldimethoxy silane, an n-octadecyltrimethoxy silane, an n-octadecylmethyldiethoxy silane, an n- octadecyltriethoxyl silane, an octadecydimethyl(3 -trimethoxy silyil- propyl)ammonium chloride, a l,2-bis(trimethoxysilyl)decane, or a 1-n- decyl-l,l,3,3,3-pentamethoxy-l,3-disilapropane.
  • Experimental testing of example LC mixtures including one or more of these silane materials indicates that these silane materials may exhibit one or more desirable properties when used in the manufacture of LC displays, as described below with reference to FIG.
  • an amount of the silane material to be mixed with the LC material is determined. This amount may be determined based on the amount of the LC material to be used in the LC display: for example, the amount of the silane material may be selected as an amount of silane material constituting at least 0.8% by weight of the LC mixture resulting from mixture of the silane material with the LC material (described at operation 110 below). In some examples, the amount of the silane material may be selected as an amount of silane material constituting between and including 0.8% and 1.2% by weight of the LC mixture resulting from mixture of the silane material with the LC material.
  • the amount of the silane material may be selected as an amount of silane material constituting approximately or exactly 1% by weight of the LC mixture resulting from mixture of the silane material with the LC material.
  • Experimental testing of example LC mixtures including approximately 1% silane material by weight indicates that these mixtures may exhibit one or more desirable properties when used in the manufacture of LC displays, as described below with reference to FIG. 3 through FIG. 9.
  • the amount of the silane material is mixed with the amount of the LC material to generate an LC mixture.
  • the LC mixture may also include one or more additional materials.
  • the LC mixture is heat treated in contact with a display substrate to bond at least a portion of the silane material to one or more surfaces of the display substrate, such that the silane material acts as a surfactant.
  • the display substrate includes one or more solid components of a display, such as a cover glass component, a circuit backplane, one or more electrodes, etc.
  • the display substrate may include one or more plastic components, with or without indium tin oxide (ITO) electrodes.
  • Heat treatment may include baking the display, filled with the LC mixture in contact with the display substrate, at various suitable temperatures for various suitable lengths of time, such as HOC for one hour, or between 105C and 115C for at least 50 minutes.
  • the amount of the silane material is determined at operation 108 by estimating an amount of silane material that is likely to bond with the one or more surfaces of a display substrate during heat treatment, based at least in part on the display substrate.
  • a silane material is selected at operation 106 that does not significantly alter the properties or performance of the display even if some portion of the silane material remains mixed with the LC material after heat treatment.
  • FIG. 2 shows a general molecular structure of an example silane molecule 200, comprising an alkyl chain 202 and three silane pendant groups 204.
  • the alkyl chain 202 includes 18 carbon atoms in the form of a CH3 group 206 and 17 CH2 groups 208.
  • Experimental testing was performed to test the properties of nematic and chiral nematic TVAN LC displays using conventional baseline LC mixtures relative to the properties of such a display using an LC mixture as described in various examples herein, e.g., an LC mixture containing a relatively high amount of a highly hydrophobic silane to act as a surfactant.
  • FIG. 3 through FIG. 9 show various results of that experimental testing, demonstrating potentially beneficial properties of the LC mixtures, LC displays, manufacturing methods, and other techniques described herein.
  • FIG. 3 shows a graph 300 of the fall time 302 of an TVAN LC display against the cell gap 304 width of a tested display for a baseline LC mixture 306 and a 1% silane mixture 308.
  • Two sets of displays were manufactured and tested, one using a baseline LC mixture 306 derived from a conventional, commercially available LC mixture, and one using an LC mixture containing approximately 1% silane material by weight, referred to herein as a 1% silane mixture 308.
  • the baseline LC mixture 306 contained a smaller amount of silane material by weight than the 1% silane mixture 308.
  • the 1% silane mixture 308 used a silane material selected from the set of silane materials identified herein.
  • the graph 300 shows that the display using the 1% silane mixture 308 exhibits a significantly faster switching speed than the display using the baseline LC mixture 306, as shown by fall time 302 of the LC material of the display (e.g., the time required for the LC material to relax when a drive voltage is removed).
  • the fall time 302 of the 1% silane mixture 308 display is at least 30 psec and usually more than 50 psec faster at the measured cell gap 304 values of 1 pm to 1.2 pm. Further improvements to LC display performance using the 1% silane mixture 308 are shown in Table 1 below:
  • VHR voltage holding ratio
  • VHR Voltage holding ratio
  • LC displays satisfying the required properties described above may exhibit instability in response to high temperatures and/or high humidity.
  • some such displays exhibit visible degradation of the LC material when exposed to a temperature of 42C and a relative humidity (RH) of 92% for 96 hours - these conditions could be present in some environments, such as summer in some tropical climates, or in certain storage or transportation environments.
  • RH relative humidity
  • FIG. 4 shows the environmental stability of a display using the baseline LC mixture 306, in a powered mode and an unpowered mode, while exposed to a temperature of 65C and a relative humidity of greater than 90% over a time course of 168 hours.
  • the top row shows the display in an unpowered state without voltage applied, and the bottom row shows the display in a powered state with a voltage applied.
  • the first unpowered state 402 and first powered state 408, at hour 0 of the time course, show uniform LC performance over the area of the display.
  • the second unpowered state 404 and second powered state 410 at hour 24 of the time course, show visible degradation of the LC performance around the perimeter of the display, especially in the top right corner.
  • the third unpowered state 406 and third powered state 412 show further visible degradation of LC performance.
  • the baseline LC mixture 306 display exhibits significant environmental instability, with highly visible degradation after 24 hours of exposure to high temperature and high humidity conditions.
  • FIG. 5 shows the environmental stability of a display using the 1% silane mixture 308, in a powered mode and an unpowered mode, while exposed to the same conditions (temperature of 65C and relative humidity of greater than 90%) over the same time course (168 hours) as FIG. 4.
  • the second unpowered state 504 and second powered state 510 show minor degradation around a thin portion of the display perimeter after 24 hours relative to the first unpowered state 502 and first powered state 508, this minor degradation may be obscured by an opaque border defining a display aperture in some designs.
  • the third unpowered state 506 and third powered state 512 at hour 168 indicate no significant change in appearance compared with hour 24, demonstrating the long-term environmental stability of the 1% silane mixture 308 display even under extreme environmental conditions. In some tests, the 1% silane mixture 308 display exhibited stable performance even after exposure to 65C and >90% RH conditions for more than 1000 hours.
  • FIG. 6 shows a transition from a nematic phase to an isotropic phase of displays created using the baseline LC mixture 306 over a temperature course of 98C to 103C. Two such displays were tested and photographed in order to provide a redundant check and validation of the recorded results.
  • FIG. 6 The images shown in FIG. 6 begin with an image of the two displays, created using the baseline LC mixture 306, in a nematic phase 602 at a temperature of 98C.
  • the arrows show the change in the visual appearance of the displays as the temperature increases, thereby causing a transition of the LC material of the displays from the nematic phase to the isotropic phase, ending in an isotropic phase 604 of the two displays at a temperature of 103C.
  • Substantial non-uniformity of the LC material across the area of the displays can be seen in the mid-transition images.
  • FIG. 7 shows a transition from a nematic phase to an isotropic phase of displays created using the 1% silane mixture 308 over the same temperature course as FIG. 6 (i.e., 98C to 103C). As in FIG. 6, two displays were tested and photographed.
  • the images shown in FIG. 7 begin with an image of the two displays, created using the 1% silane mixture 308, in a nematic phase 702 at a temperature of 98C.
  • the arrows show the change in the visual appearance of the displays as the temperature increases, thereby causing a transition of the LC material of the displays from the nematic phase to the isotropic phase, ending in an isotropic phase 704 of the two displays at a temperature of 103C.
  • the displays shown in FIG. 7 exhibit significantly improved uniformity and visual performance during the phase transition.
  • FIG. 8 shows a transition from an isotropic phase to a nematic phase of two displays created using the baseline LC mixture 306 over a temperature course of 105C to 95C.
  • the displays transition from the isotropic phase 802 to the nematic phase 804, significant nonuniformity and degradation of visual performance can be seen.
  • FIG. 9 shows the transition from the isotropic phase 902 to the nematic phase 904 of two displays created using the 1% silane mixture 308 over the temperature course of FIG. 8, i.e., 105C to 95C.
  • the displays transition from the isotropic phase 902 to the nematic phase 904, their visual performance and uniformity are significantly improved relative to the displays shown in FIG. 8.
  • LC display manufacturing methods, LC mixtures, and LC displays are provided that may provide improved LC alignment quality and stability relative to conventional techniques or conditions.
  • Example l is a method for manufacturing a liquid crystal (LC) display, comprising: determining an amount of an LC material to be used in the LC display; based on the LC material and the amount of the LC material, determining: a silane material to be mixed with the LC material; and an amount of the silane material to be mixed with the LC material; mixing the amount of the silane material with the amount of the LC material to generate an LC mixture; and heat treating the LC mixture in contact with a display substrate to bond at least a portion of the silane material to one or more surfaces of the display substrate, such that the silane material acts as a surfactant.
  • LC liquid crystal
  • Example 2 the subject matter of Example 1 includes, wherein: determining the amount of the silane material to be mixed with the LC material comprises: determining an amount of the silane material constituting at least 0.8% of the LC mixture by weight.
  • Example 3 the subject matter of Example 2 includes, wherein: determining the amount of the silane material to be mixed with the LC material comprises: determining an amount of the silane material constituting between and including 0.8% and 1.2% of the LC mixture by weight.
  • Example 4 the subject matter of Examples 2-3 includes, wherein: determining the amount of the silane material to be mixed with the LC material comprises: determining an amount of the silane material that is likely to bond with the one or more substrate surfaces during heat treatment, based at least in part on the display substrate.
  • Example 5 the subject matter of Examples 2-4 includes, wherein: heat treating the LC mixture comprises baking the LC mixture at a temperature between 105C and 115C for at least 50 minutes.
  • the subject matter of Examples 2-5 includes, wherein: the silane material comprises silane molecules having one or more silane pendant groups and an alkyl chain comprising or more carbon atoms.
  • Example 7 the subject matter of Examples 2-6 includes, wherein: the silane material comprises: an n-octadecyldimethylmethoxy silane; an n- octadecylmethyldimethoxy silane; an n-octadecyltrimethoxy silane; an n- octadecylmethyldiethoxy silane; an n-octadecyltriethoxyl silane; an octadecydimethyl(3-trimethoxysilyil-propyl)ammonium chloride; a 1,2- bis(trimethoxysilyl)decane; or a l-n-decyl-l,l,3,3,3-pentamethoxy-l,3- disilapropane.
  • the silane material comprises: an n-octadecyldimethylmethoxy silane; an n- octadecylmethyl
  • Example 8 the subject matter of Example 7 includes, wherein: the silane material is an n-octadecyldimethylmethoxy silane.
  • Example 9 the subject matter of Examples 7-8 includes, wherein: the silane material is an n-octadecylmethyldimethoxy silane.
  • Example 10 the subject matter of Examples 7-9 includes, wherein: the silane material is an n-octadecyltrimethoxy silane.
  • Example 11 the subject matter of Examples 7-10 includes, wherein: the silane material is an n-octadecylmethyldi ethoxy silane.
  • Example 12 the subject matter of Examples 7-11 includes, wherein: the silane material is an n-octadecyltriethoxyl silane.
  • Example 13 the subject matter of Examples 7-12 includes, wherein: the silane material is an octadecydimethyl(3-trimethoxysilyil- propyljammonium chloride.
  • Example 14 the subject matter of Examples 2-13 includes, wherein: the LC material comprises a nematic LC material or chiral nematic LC material with a negative dielectric anisotropy; and the LC display comprises a spatial light modulator configured to operate in a vertically aligned nematic (VAN) display mode.
  • VAN vertically aligned nematic
  • Example 15 the subject matter of Examples 2-14 includes, wherein: the LC material comprises a nematic LC material or chiral nematic LC material with a negative dielectric anisotropy; and the LC display comprises a spatial light modulator configured to operate in a twisted vertically aligned nematic (TV AN) display mode.
  • the LC material comprises a nematic LC material or chiral nematic LC material with a negative dielectric anisotropy
  • the LC display comprises a spatial light modulator configured to operate in a twisted vertically aligned nematic (TV AN) display mode.
  • Example 16 is a liquid crystal (LC) mixture for use in an LC display, comprising: an amount of an LC material; and an amount of a silane material determined based on the LC material and the amount of the LC material.
  • LC liquid crystal
  • Example 17 the subject matter of Example 16 includes, wherein: the amount of the silane material is at least 0.8% of the LC mixture by weight.
  • Example 18 the subject matter of Example 17 includes, wherein: the amount of the silane material is between and including 0.8% and 1.2% of the LC mixture by weight.
  • Example 19 the subject matter of Examples 17-18 includes, wherein: the silane material comprises silane molecules having one or more silane pendant groups and an alkyl chain comprising or more carbon atoms.
  • Example 20 the subject matter of Examples 17-19 includes, wherein: the silane material comprises: an n-octadecyldimethylmethoxy silane; an n-octadecylmethyldimethoxy silane; an n-octadecyltrimethoxy silane; an n-octadecylmethyldiethoxy silane; an n-octadecyltriethoxyl silane; an octadecydimethyl(3 -trimethoxy silyil-propyl)ammonium chloride; a 1,2- bis(trimethoxysilyl)decane; or a l-n-decyl-l,l,3,3,3-pentamethoxy-l,3- disilapropane.
  • the silane material comprises: an n-octadecyldimethylmethoxy silane; an n-octadecylmethyldime
  • Example 21 the subject matter of Examples 17-20 includes, wherein: the LC material comprises a nematic LC material or chiral nematic LC material with a negative dielectric anisotropy; and the LC display comprises a spatial light modulator configured to operate in a vertically aligned nematic (VAN) display mode or a twisted vertically aligned nematic (TV AN) display mode.
  • VAN vertically aligned nematic
  • TV AN twisted vertically aligned nematic
  • Example 22 is a liquid crystal (LC) display, comprising: a nematic LC material or chiral nematic LC material with a negative dielectric anisotropy configured to operate in a vertically aligned nematic (VAN) display mode or a twisted vertically aligned nematic (TV AN) display mode; a display substrate configured to contain the nematic LC material or chiral nematic LC material; and a silane material bonded to one or more surfaces of the display substrate and positioned between the one or more surfaces and the nematic LC material or chiral nematic LC material, the silane material: being present in an amount such that a ratio of the amount of the silane material to an amount of the nematic LC material or chiral nematic LC material is between 0.8:99.2 and 1.2:98.8; and comprising: an n- octadecyldimethylmethoxy silane;
  • Example 23 is at least one machine-readable medium including instructions that, when executed by processing circuitry, cause the processing circuitry to perform operations to implement any of Examples 1-22.
  • Example 24 is an apparatus comprising means to implement any of Examples 1-22.
  • Example 25 is a system to implement any of Examples 1-22.
  • Example 26 is a method to implement any of Examples 1-22.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal Substances (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un affichage à cristaux liquides (LC) qui consiste à déterminer une quantité d'un matériau LC à utiliser dans l'affichage LC, à déterminer un matériau silane à mélanger avec le matériau LC et une quantité du matériau silane à mélanger avec le matériau LC sur la base du matériau LC et de la quantité du matériau LC, à mélanger la quantité du matériau silane avec la quantité du matériau LC pour générer un mélange LC, et à traiter thermiquement le mélange LC en contact avec un substrat d'affichage pour lier au moins une partie du matériau silane à une ou plusieurs surfaces du substrat d'affichage, de telle sorte que le matériau silane agit comme un tensioactif. La quantité du matériau silane peut constituer au moins 0,8% du mélange LC en poids.
PCT/US2024/029674 2023-06-08 2024-05-16 Qualité et stabilité d'alignement de cristaux liquides améliorées Pending WO2024253820A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US202363506970P 2023-06-08 2023-06-08
US63/506,970 2023-06-08
US18/664,986 US12399402B2 (en) 2023-06-08 2024-05-15 Liquid crystal alignment quality and stability
US18/664,986 2024-05-15

Publications (1)

Publication Number Publication Date
WO2024253820A1 true WO2024253820A1 (fr) 2024-12-12

Family

ID=91586082

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2024/029674 Pending WO2024253820A1 (fr) 2023-06-08 2024-05-16 Qualité et stabilité d'alignement de cristaux liquides améliorées

Country Status (1)

Country Link
WO (1) WO2024253820A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8724059B2 (en) 2003-02-26 2014-05-13 Compound Photonics Limited Vertically aligned nematic mode liquid crystal display having large tilt angles and high contrast
CN110928056A (zh) * 2019-11-22 2020-03-27 华南师范大学 液晶显示器件及其制备方法和电子设备

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8724059B2 (en) 2003-02-26 2014-05-13 Compound Photonics Limited Vertically aligned nematic mode liquid crystal display having large tilt angles and high contrast
US9551901B2 (en) 2003-02-26 2017-01-24 Compound Photonics Limited Vertically aligned nematic mode liquid crystal display having large tilt angles and high contrast
CN110928056A (zh) * 2019-11-22 2020-03-27 华南师范大学 液晶显示器件及其制备方法和电子设备

Similar Documents

Publication Publication Date Title
JP4392186B2 (ja) 高速度応答液晶素子および駆動方法
US10871694B2 (en) Bistable cholesteric liquid crystal switchable window
KR20080023320A (ko) 액정 디스플레이 소자
KR100260290B1 (ko) 액정재료및액정표시장치
US12399402B2 (en) Liquid crystal alignment quality and stability
WO2024253820A1 (fr) Qualité et stabilité d'alignement de cristaux liquides améliorées
US6667077B1 (en) Liquid crystal display device
JPH05297376A (ja) 強誘電性液晶ディスプレイ素子
US20160145493A1 (en) Dichroic-dye-doped isotropic chiral liquid crystals
JP3271384B2 (ja) 位相制御素子用の液晶配向膜の形成方法
KR20000077112A (ko) 단안정, 강유전성 액정 표시 장치
JPH11305234A (ja) 液晶表示素子およびその製造方法
JPH11223816A (ja) 液晶素子及びその製造方法、並びに配向膜又はその組成物
JPH0255318A (ja) 液晶使用装置
CN112433403A (zh) 一种光调制装置
JP3365587B2 (ja) 液晶装置
JPH11160725A (ja) 液晶表示素子
WO2007083784A1 (fr) Affichage a cristaux liquides
JPH03192324A (ja) ポリマー分散型液晶表示装置
KR100198365B1 (ko) 액정 매질의 정렬 방법
JP3466635B2 (ja) 液晶表示装置
JPS5876483A (ja) 液晶混合物
JP2000137228A (ja) 液晶素子
JPH04353831A (ja) 液晶シャッター
JP3079762B2 (ja) 強誘電性液晶組成物および液晶表示素子

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24734311

Country of ref document: EP

Kind code of ref document: A1