A negative nematic liquid crystal composition, a reverse polymer dispersed liquid crystal material and applications thereof

Abstract

The present invention discloses a negative nematic liquid crystal composition, comprising: 1) one or more compounds represented by Formula I, 2) one or more compounds represented by Formula II-1 and / or Formula II-2, and the clearing point of the compound represented by Formula II-1 and / or II-2 is lower than 50 °C. The present invention also discloses, in particular, a reverse polymer dispersed liquid crystal material and a liquid crystal display device prepared therefrom, which overcome the problems of low transmittance in the transparent state, poor haze in the haze state, and high driving voltage existing in the prior art reverse PDLC devices.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal applications. More specifically, it relates to a negative nematic liquid crystal composition, a reverse polymer dispersed liquid crystal material and applications thereof. Background Art

[0002] Polymer dispersed liquid crystal (PDLC) is a material formed by mixing liquid crystal molecules with a prepolymer and undergoing phase separation through a polymerization reaction to form liquid crystal microdroplets uniformly dispersed in a polymer three-dimensional network, ultimately resulting in a material with optoelectronic response characteristics. For a positive PDLC, when no electric field is applied, the director of the liquid crystal molecules is irregularly distributed, and its effective refractive index ne does not match the refractive index np of the polymer, and the thin film is in a light scattering state, called the fog state; when an electric field is applied, the long axis of the liquid crystal molecules is arranged parallel to the electric field, and its effective refractive index matches the refractive index of the polymer, and the thin film is in a light transmission state, called the transparent state. If applied to scenarios such as architectural glass or vehicle windows that need to maintain the transparent state for a long time, the positive PDLC requires continuous power supply, resulting in a large amount of energy loss and too high usage costs. Therefore, it is necessary to design a PDLC that maintains the transparent state without power supply and converts to the fog state when powered on, called a reverse PDLC.

[0003] Currently, reverse PDLCs have not been widely applied industrially because the products all have problems such as low light transmittance in the transparent state (less than 80%) and poor haze in the fog state (less than 80%). On the other hand, the voltage required to apply in the fog state is relatively high, generally above 60V, resulting in large energy consumption. Therefore, there is an urgent need for a reverse PDLC display device with a low driving voltage. Summary of the Invention

[0004] To overcome the problems of low light transmittance in the transparent state, poor haze in the fog state, and high driving voltage existing in reverse PDLC devices in the prior art, the first object of the present invention is to provide a negative nematic liquid crystal composition.

[0005] The second object of the present invention is to provide a reverse polymer dispersed liquid crystal material.

[0006] The third object of the present invention is to provide a reverse polymer dispersed liquid crystal display device.

[0007] To achieve the above first object, the present invention adopts the following technical solutions:

[0008] A negative nematic liquid crystal composition, comprising:

[0009] 1) One or more compounds represented by formula I,

[0010]

[0011] Wherein:

[0012] R1 and R2 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and one or more -CH2- in R1 may be replaced by cyclopentyl, cyclobutyl or cyclopropyl;

[0013] n represents 0 or 1, and when n is 0, R1 represents

[0014] One of Z1 and Z2 represents -C≡C-, and the other represents a single bond, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF- or -CH2O-;

[0015] Each independently represents And may be optionally substituted by an F atom or a methyl group;

[0016] 2) One or more compounds represented by Formula II-1 and / or Formula II-2, and the clearing point of the compound represented by Formula II-1 and / or II-2 is lower than 50 °C,

[0017]

[0018] Wherein,

[0019] R3 represents An alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms;

[0020] R4 represents an alkylene group having 1 to 7 carbon atoms, an alkyleneoxy group having 1 to 7 carbon atoms, an alkenylene group having 2 to 7 carbon atoms, an alkenyleneoxy group having 3 to 7 carbon atoms, a fluorine-substituted alkylene group having 1 to 7 carbon atoms, a fluorine-substituted alkyleneoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenylene group having 2 to 7 carbon atoms or a fluorine-substituted alkenyleneoxy group having 3 to 7 carbon atoms;

[0021] Z3 represents -C≡C-, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF-, -CH2O- or a single bond;

[0022] Z4 represents a single bond or -CH2O-;

[0023] each independently represents and may optionally be substituted with an F atom, a methyl group or an ethyl group;

[0024] P1 represents a methacrylate group or an acrylate group.

[0025] Furthermore, the compound represented by Formula I is selected from the group consisting of the compounds represented by the following Formula I-1 to Formula I-6,

[0026]

[0027]

[0028] wherein:

[0029] R 11 represents

[0030] R 12 、R 21 each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and one or more CH2 in R 12 may be substituted with a cyclopentyl group, a cyclobutyl group or a cyclopropyl group.

[0031] Furthermore, the compound represented by Formula II-1 is selected from the group consisting of the compounds represented by the following Formula II-1-1 to Formula II-1-4,

[0032]

[0033] The compound represented by Formula II-2 is selected from the compound represented by the following Formula II-2-1,

[0034]

[0035] wherein,

[0036] R3 represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and R 12, one or more CH2 in R3 can be substituted by cyclopentyl, cyclobutyl or cyclopropyl;

[0037] R4 represents an alkylene group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenylene group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluoro-substituted alkylene group having 1 to 7 carbon atoms, a fluoro-substituted alkoxy group having 1 to 7 carbon atoms, a fluoro-substituted alkenylene group having 2 to 7 carbon atoms or a fluoro-substituted alkenyloxy group having 3 to 7 carbon atoms;

[0038] Z4 represents a single bond or -CH2O;

[0039] L3 represents an H atom or a methyl group.

[0040] Furthermore, the negative nematic liquid crystal composition further comprises one or more compounds represented by Formula III,

[0041]

[0042] wherein,

[0043] R5 and R6 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluoro-substituted alkyl group having 1 to 7 carbon atoms, a fluoro-substituted alkoxy group having 1 to 7 carbon atoms, a fluoro-substituted alkenyl group having 2 to 7 carbon atoms or a fluoro-substituted alkenyloxy group having 3 to 7 carbon atoms;

[0044] x represents 0 or 1;

[0045] each independently represents and may be optionally substituted by an F atom, a methyl group or an ethyl group.

[0046] Furthermore, the compound represented by Formula III is selected from the group consisting of compounds represented by the following Formula III-1 to Formula III-8,

[0047]

[0048]

[0049] wherein,

[0050] R5 and R6 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluoro-substituted alkyl group having 1 to 7 carbon atoms, a fluoro-substituted alkoxy group having 1 to 7 carbon atoms, a fluoro-substituted alkenyl group having 2 to 7 carbon atoms or a fluoro-substituted alkenyloxy group having 3 to 7 carbon atoms.

[0051] Furthermore, the negative nematic liquid crystal composition further comprises one or more compounds represented by Formula IV,

[0052]

[0053] wherein,

[0054] R7 and R8 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms;

[0055] L1 and L2 each independently represent an H atom, a Cl atom, an F atom, a methyl group or an ethyl group.

[0056] Furthermore, the compound represented by Formula IV is selected from the group consisting of compounds represented by the following Formula IV-1 to Formula IV-5,

[0057]

[0058]

[0059] wherein,

[0060] R7 and R8 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms.

[0061] To achieve the above second object, the present invention provides the following technical solutions:

[0062] A reverse polymer dispersed liquid crystal material, which is obtained by crosslinking and curing a negative nematic liquid crystal composition, a polymerizable monomer and an ultraviolet curable glue as described in the first object above.

[0063] Furthermore, the mass percentage of the negative nematic liquid crystal composition in the reverse polymer dispersed liquid crystal material is 34 to 75%; the mass percentage of the ultraviolet curable glue in the reverse polymer dispersed liquid crystal material is 24 to 65%; the mass percentage of the polymerizable monomer in the reverse polymer dispersed liquid crystal material is 0.5 to 10%.

[0064] To achieve the above-mentioned third objective, the present invention provides the following technical solution:

[0065] A reverse polymer dispersed liquid crystal display device, comprising a first substrate layer, a first conductive layer, a first alignment layer, a liquid crystal layer formed of the reverse polymer dispersed liquid crystal material as described in the first objective above, a second alignment layer, a second conductive layer, and a second substrate layer, which are sequentially arranged from top to bottom.

[0066] Further, at least one of the first substrate layer and the second substrate layer has a liquid crystal alignment film for vertically aligning liquid crystals, and the liquid crystal alignment film is obtained from a liquid crystal alignment treatment agent.

[0067] Further, the liquid crystal alignment treatment agent contains one or more polymers selected from acrylic polymers, methacrylic polymers, novolak resins, polyhydroxystyrene, polyimide precursors, polyimides, polyamides, polyesters, celluloses, or polysiloxanes.

[0068] The beneficial effects of the present invention are as follows:

[0069] The negative nematic liquid crystal composition provided by the present invention is used to prepare a reverse polymer liquid crystal material, and further, the prepared reverse polymer dispersed liquid crystal display device has a transmittance greater than 80% when not powered on, and a haze greater than 85% when a voltage of 25V is applied. It realizes the conversion from the transparent state to the hazy state at a lower voltage, achieving the purpose of reducing power consumption and saving energy, and can be applied to fields such as smart windows and transparent displays. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings.

[0071] Figure 1 Shows a schematic structural diagram of the reverse PDLC device of the present invention;

[0072] Among them, Figure 1 in, 1: First substrate layer; 2: First conductive layer; 3: First alignment layer; 4: PDLC layer; 5: Second alignment layer; 6: Second conductive layer; 7: Second substrate layer.

[0073] Figure 2 Shows a schematic structural diagram of a liquid crystal polymer composite material of the present invention;

[0074] Among them, Figure 2 in, 1: ITO substrate; 2: Polymer network; 3: Interface of liquid crystal polymer; 4: Liquid crystal. DETAILED DESCRIPTION OF THE INVENTION

[0075] To more clearly illustrate the present invention, the present invention will be further described below in conjunction with preferred embodiments and the accompanying drawings. Similar components in the drawings are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0076] One embodiment of the present invention discloses a negative nematic liquid crystal composition, which comprises:

[0077] 1) One or more compounds represented by Formula I,

[0078]

[0079] Wherein:

[0080] R1 and R2 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and one or more -CH2- in R1 may be replaced by cyclopentyl, cyclobutyl or cyclopropyl;

[0081] n represents 0 or 1, and when n is 0, R1 represents

[0082] One of Z1 and Z2 represents -C≡C-, and the other represents a single bond, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF- or -CH2O- (herein, that is, if Z1 represents -C≡C-, then Z2 represents a single bond, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF- or -CH2O-; if Z2 represents -C≡C-, then Z1 represents a single bond, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF- or -CH2O-);

[0083] Each independently represents (wherein, the "-" in the foregoing groups represents a connecting bond single bond) and may be optionally substituted by one or more of F atoms or methyl groups; the following substituted groups can be enumerated: (It can be understood that among the foregoing enumerated substituted groups, when the structure only contains "-" and does not contain When, "-" represents a connecting bond single bond; when the substituted group contains both "-" and When only represents a single bond of the linking key.);

[0084] 2) One or more compounds represented by Formula II-1 and / or Formula II-2, and the clearing point of the compound represented by Formula II-1 and / or II-2 is lower than 50 °C,

[0085]

[0086] Wherein,

[0087] R3 represents an alkyl group having 1 to 7 carbon atoms (exemplary including but not limited to ), an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms;

[0088] R4 represents an alkylene group having 1 to 7 carbon atoms, an alkyleneoxy group having 1 to 7 carbon atoms, an alkenylene group having 2 to 7 carbon atoms, an alkenyleneoxy group having 3 to 7 carbon atoms, a fluorine-substituted alkylene group having 1 to 7 carbon atoms, a fluorine-substituted alkyleneoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenylene group having 2 to 7 carbon atoms or a fluorine-substituted alkenyleneoxy group having 3 to 7 carbon atoms;

[0089] Z3 represents -C≡C-, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF-, -CH2O- or a single bond;

[0090] Z4 represents a single bond or -CH2O-;

[0091] Each independently represents and may be optionally substituted simultaneously by one or more of F atoms, methyl groups or ethyl groups; The following substituents can be listed: (It can be understood that among the aforementioned listed substituents, in the structure, only contains "-" and does not contain When, "-" represents a single bond of the linking key; when the substituent contains both "-" and When only represents a single bond of the linking key.).

[0092] P1 represents a methacrylate group or an acrylate group.

[0093] In the embodiments of the present invention, the compound represented by Formula I affects the UV curing in the process. The phase separation between the liquid crystal and the polymer during the curing process is affected by the compound represented by Formula I. Meanwhile, the compounds represented by Formula II-1 and / or Formula II-2 tend to polymerize finally under this influence, forming a functional film on the liquid crystal / polymer interface, which affects the optoelectronic properties. If only the compound represented by Formula I is present, there is no functional interface, and the haze value cannot reach the ideal value after applying voltage. If only the compounds represented by Formula II-1 and / or Formula II-2 are present, a large amount of the compounds represented by Formula II-1 and / or Formula II-2 will be wrapped by other polymers during polymerization, and a functional interface cannot be formed either, and the haze value cannot reach the ideal value after applying voltage.

[0094] In addition, those skilled in the art can understand that the selection of each group in Formula II-1 and Formula II-2 is independent of each other and not interfered with.

[0095] In a preferred example, the compound represented by Formula I is selected from the group consisting of the compounds represented by the following Formula I-1 to Formula I-6,

[0096]

[0097] Wherein:

[0098] R 11 represents R 12 and R 21 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and one or more CH2 in R 12 can be substituted by cyclopentyl, cyclobutyl or cyclopropyl.

[0099] In another preferred example, the compound represented by Formula II-1 is selected from the group consisting of the compounds represented by the following Formula II-1-1 to Formula II-1-4,

[0100]

[0101]

[0102] The compound represented by Formula II-2 is selected from the compound represented by the following Formula II-2-1,

[0103]

[0104] Wherein,

[0105] R3 represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and R 12 , one or more CH2 in R3 may be replaced by cyclopentyl, cyclobutyl or cyclopropyl;

[0106] R4 represents an alkylene group having 1 to 7 carbon atoms, an alkyleneoxy group having 1 to 7 carbon atoms, an alkenylene group having 2 to 7 carbon atoms, an alkenyleneoxy group having 3 to 7 carbon atoms, a fluorine-substituted alkylene group having 1 to 7 carbon atoms, a fluorine-substituted alkyleneoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenylene group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyleneoxy group having 3 to 7 carbon atoms;

[0107] Z4 represents a single bond or -CH2O;

[0108] L3 represents an H atom or a methyl group.

[0109] In yet another preferred example, the negative nematic liquid crystal composition further comprises one or more compounds represented by Formula III,

[0110]

[0111] wherein,

[0112] R5 and R6 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms;

[0113] x represents 0 or 1;

[0114] each independently represents (wherein, the "-" in these groups represents a single bond of the connecting bond); and may be optionally substituted by an F atom, a methyl group or an ethyl group; the following substituted groups can be exemplified:

[0115]

[0116] Further preferably, the compound represented by Formula III is selected from the group consisting of compounds represented by the following Formula III-1 to Formula III-8,

[0117]

[0118] Among them,

[0119] R5 and R6 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms.

[0120] In yet another preferred example, the negative nematic liquid crystal composition further comprises one or more compounds represented by Formula IV,

[0121]

[0122] Among them,

[0123] R7 and R8 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms;

[0124] L1 and L2 each independently represent an H atom, a Cl atom, an F atom, a methyl group, or an ethyl group.

[0125] In a preferred example, the compound represented by Formula IV is selected from the group consisting of compounds represented by the following Formula IV-1 to Formula IV-5,

[0126]

[0127] Among them,

[0128] R7 and R8 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms.

[0129] According to yet another specific embodiment of the present invention, there is provided a reverse polymer dispersed liquid crystal material, which comprises the negative nematic liquid crystal composition provided in the above first embodiment, a polymerizable monomer, and an ultraviolet curable adhesive.

[0130] In the reverse polymer dispersed liquid crystal material disclosed in this embodiment, optionally, the ultraviolet curable glue is selected from a polyurethane acrylate resin system, an epoxy acrylate system, a polyester acrylate system, a polyether acrylate system, or a pure acrylate system.

[0131] In the reverse polymer dispersed liquid crystal material disclosed in this embodiment, optionally, the nematic liquid crystal with negative dielectric anisotropy accounts for 35-75% of the total mass of the reverse polymer dispersed liquid crystal layer; the ultraviolet curable glue accounts for 25-65% of the total mass of the reverse polymer dispersed liquid crystal material; the polymerizable monomer accounts for 0.5-10% of the total mass of the reverse polymer dispersed liquid crystal material.

[0132] Another specific embodiment of the present invention provides a reverse polymer dispersed liquid crystal display device, which includes a first substrate layer 1, a first conductive layer 2, a first alignment layer 3, a liquid crystal layer 4 formed of a reverse polymer dispersed liquid crystal material, a second alignment layer 5, a second conductive layer 6, and a second substrate layer 7 arranged in sequence from top to bottom, as shown in the attached Figure 1 figure, wherein the reverse polymer dispersed liquid crystal material is as described above.

[0133] In the reverse polymer dispersed liquid crystal display device disclosed in this embodiment, optionally, the substrate layer is glass and a polymer, and the polymer is polyethylene terephthalate (PET), polyimide (PI), or clear polyimide (CPI); the conductive layer material can be ITO or a metal electrode material, and the metal electrode material is Ag, Cu, or Al.

[0134] In the reverse polymer dispersed liquid crystal display device disclosed in this embodiment, at least one of the first substrate 1 and the second substrate 7 has a liquid crystal alignment film for vertically aligning liquid crystals, and the liquid crystal alignment film is obtained from a liquid crystal alignment treatment agent, and the liquid crystal alignment treatment agent contains one or more polymers selected from acrylic polymers, methacrylic polymers, novolac resins, polyhydroxystyrene, polyimide precursors, polyimides, polyamides, polyesters, celluloses, or polysiloxanes.

[0135] From the viewpoints of the coating method of the liquid crystal alignment treatment agent and obtaining the target film thickness, the solvent content in the liquid crystal alignment treatment agent can be appropriately selected. Among them, from the viewpoint of forming a uniform vertical liquid crystal alignment film by coating, the solvent content in the liquid crystal alignment treatment agent is preferably 50-99.9% by mass, more preferably 90-99% by mass, and particularly preferably 95-99% by mass.

[0136] The manufacturing method of the reverse polymer dispersed liquid crystal display device disclosed in this embodiment can be listed as: obtained by coating a liquid crystal alignment treatment agent on a substrate and firing it.

[0137] The coating method of the liquid crystal alignment agent is not particularly limited. Industrially, there are screen printing, offset printing, flexographic printing, inkjet method, dip coating method, roll coating method, slot coating method, spin coating method, spray coating method, etc., which can be appropriately selected according to the type of substrate and the target film thickness of the vertical liquid crystal alignment film.

[0138] After the liquid crystal alignment agent is coated on the substrate, by using heating means such as a hot plate, a heat circulation type oven or an IR (infrared) type oven, according to the type of substrate and the solvent used in the liquid crystal alignment agent, the solvent is evaporated at a temperature of 30 to 300 °C, preferably 30 to 250 °C, so that a vertical liquid crystal alignment film can be formed. In particular, when a plastic substrate is used as the substrate, it is preferably processed at a temperature of 30 to 150 °C.

[0139] When the thickness of the fired vertical liquid crystal alignment film is too thick, it is disadvantageous in terms of power consumption of the liquid crystal display element. When the thickness is too thin, the reliability of the element sometimes decreases. Therefore, it is preferably 5 to 500 nm, more preferably 10 to 300 nm, and particularly preferably 10 to 250 nm.

[0140] Among the liquid crystal compositions used in this embodiment, spacers for controlling the electrode gap (also called the gap.) of the liquid crystal display element, that is, the liquid crystal layer thickness, can also be introduced. The injection method of the liquid crystal composition is not particularly limited. For example, the following methods can be cited: when the substrate is a glass substrate, the following methods can be cited: Prepare a pair of substrates formed with a vertical liquid crystal alignment film, coat a sealant on one side of the substrate except for a part, and then paste it on the other side of the substrate with the surface of the vertical liquid crystal alignment film facing inward, thereby making an empty cell. And the liquid crystal composition is injected under reduced pressure from the uncoated sealant part, so as to obtain a cell injected with the liquid crystal composition. Furthermore, when the substrate is a plastic substrate or a thin film, the following methods can be cited: Prepare a pair of substrates formed with a vertical liquid crystal alignment film, drop the liquid crystal composition on one side of the substrate by using the ODF (One Drop Filling) method, inkjet method, etc., and then paste the other side of the substrate, so as to obtain a cell injected with the liquid crystal composition. In the liquid crystal display element of the present invention, since the adhesion between the liquid crystal layer and the vertical liquid crystal alignment film is high, a sealant may not be coated on the substrate. When the substrate is a plastic substrate or a thin film, the following methods can be cited: Prepare a pair of substrates formed with a vertical liquid crystal alignment film, bond them by a roll-to-roll method. Before rolling, a mixture of liquid crystal, polymer and spacer is coated between the two substrates. The spacer supports the substrate monolayer by roller extrusion, and the mixture is placed between the two substrates.

[0141] The gap of the liquid crystal display element can be controlled by the aforementioned spacers or the like. Examples of such methods include: the method of introducing spacers of a target size into the liquid crystal composition as described above, the method of using a substrate with column spacers of a target size, etc. In addition, when a plastic or thin film substrate is used for the substrate and the substrates are bonded by lamination, the gap can be controlled without introducing spacers.

[0142] The technical solutions of the present invention will be described below in conjunction with some specific embodiments:

[0143] In the following text, "haze" is measured using a WGT-S transmittance / haze meter.

[0144] The preparation method of the liquid crystal composition is as follows: Weigh each liquid crystal monomer according to a certain ratio and put it into a stainless steel beaker. Place the stainless steel beaker containing each liquid crystal monomer on a magnetic stirring instrument and heat it to melt. After most of the liquid crystal monomers in the stainless steel beaker have melted, add a magnetic rotor to the stainless steel beaker, stir the mixture evenly, and then cool it to room temperature to obtain the liquid crystal composition.

[0145] In the embodiments of the present invention, the structures of the liquid crystal monomers are represented by codes. The code representation methods for the liquid crystal ring structure, end groups, and linking groups are shown in Tables 1 and 2 below.

[0146] Table 1 Corresponding Codes for Ring Structures

[0147]

[0148] Table 2: Corresponding Codes for End Groups and Linking Groups

[0149]

[0150]

[0151] For example:

[0152] Its code is PWY-3-O2;

[0153] Its code is PPWY-3-O2;

[0154] Its code is PGWP-3-2;

[0155] Its code is PPXY-3-O2;

[0156] Its code is PWY-Cp-O2;

[0157] Its code is PYWP-Cpr1-O2;

[0158] Example 1

[0159] Liquid crystal composition Mix1 formulation

[0160] Table 3

[0161] Category Liquid crystal monomer code Content (%) Ⅰ YWY-Cpr1-O3 7 Ⅰ YWY-Cp-O3 7 Ⅰ CYWY-3-O2 10 Ⅰ CYWY-4-O3 8 Ⅰ PPWY-5-O2 8 Ⅰ PWY-CP-O2 7 Ⅰ PWY-CPr1-O3 7 Ⅲ CPY-3-O2 12 Ⅲ PY-2O-O2 10 Ⅲ PY-3-O2 10 Ⅳ PYP-Cpr1-1 9 Ⅳ PGP-3-2 5

[0162] Polymerizable liquid crystal monomer II: Monomer clearing point 0°C

[0163]

[0164] Adhesive:

[0165] Polyurethane acrylate,

[0166] Substrate: ITO / PET flexible substrate with a vertically aligned polyimide layer

[0167] Mix1, polymerizable monomer, adhesive, and glass microsphere spacers were mixed evenly at a mass ratio of 45:55:8:0.3 under yellow light conditions to obtain a reverse PDLC material.

[0168] The reverse PDLC material was coated on the substrate, covered with the other side substrate, and the two substrates were pressed into one piece by a roll-to-roll rolling method. It was placed under a UV lamp and irradiated for 10 min to fully polymerize the polymer, thus obtaining a reverse PDLC device, as Figure 1 shown.

[0169] The haze and transmittance were measured using a WGT-S haze / transmittance meter. When no voltage was applied, the transmittance in the transparent state was 84% and the haze was 9%; when a voltage of 25 V was applied, the haze in the hazy state was 85%.

[0170] Example 2

[0171] Liquid crystal composition Mix2 formulation

[0172] Table 4

[0173] Category Liquid crystal monomer code Content (%) Ⅰ YWY-Cpr-O3 10 Ⅰ PWP-Cp-O3 10 Ⅰ CPWP-3-2 6 Ⅰ PYWY-3-O2 5 Ⅰ CYWY-5-O3 5 Ⅰ YWY-Cp-2 10 Ⅰ CYWY-5-O2 5 Ⅰ CPWY-3-O2 7 Ⅰ CPWY-4-O3 7 Ⅲ PY-3-O2 15 Ⅳ PYP-Cpr1-1 10 Ⅳ PGP-V2-3 10

[0174] Polymerizable monomer II: Monomer clearing point -20°C

[0175]

[0176] Adhesive:

[0177] Polyurethane acrylate

[0178] Substrate: ITO / PET substrate with a vertically aligned polyimide layer

[0179] Mix2, polymerizable monomers, glue, and glass bead spacers were mixed evenly at a mass ratio of 50:50:10:0.3 under yellow light conditions to obtain a reverse PDLC material.

[0180] The film-making process was the same as that in Example 1.

[0181] The haze and transmittance were measured using a WGT-S transmittance / haze meter. When no voltage was applied, the transmittance in the transparent state was 84% and the haze was 11%. When a voltage of 25 V was applied, the haze in the foggy state was 85%.

[0182] Example 3

[0183] Liquid crystal composition Mix3 formula

[0184] Table 5

[0185] Category Liquid crystal monomer code Content (%) Ⅰ YWY-Cpr-O3 7 Ⅰ CYWY-Cp-O3 7 Ⅰ PYWY-4-O3 9 Ⅰ PPWY-5-O2 9 Ⅲ CPY-3-O2 12 Ⅲ CCY-5-O3 9 Ⅲ PPY-3-O2 5 Ⅲ PY-2O-O2 10 Ⅳ PYP-Cpr1-2 5 Ⅳ PGP-3-2 5 Ⅳ PGP-2V-2 8 Ⅳ PGP-2V-3 8 Ⅳ PYP-2V-2 6

[0186] Polymerizable monomer II: Monomer clearing point 30 °C

[0187]

[0188] Glue:

[0189] Polyurethane acrylate

[0190] Substrate: ITO / PET substrate with a vertically aligned polyimide layer

[0191] Mix3, polymerizable monomers, glue, and glass bead spacers were mixed evenly at a mass ratio of 50:50:3:0.3 under yellow light conditions to obtain a reverse PDLC material.

[0192] Film-making was the same as in Example 1.

[0193] The haze and transmittance were measured using a WGT-S transmittance / haze meter. When no voltage was applied, the transmittance in the transparent state was 84% and the haze was 8%. When a voltage of 25 V was applied, the haze in the foggy state was 85%.

[0194] Comparative Example 1

[0195] Liquid crystal composition Mix4 formula

[0196] Table 6

[0197]

[0198]

[0199] Polymerizable monomer: Monomer clearing point 155 °C

[0200]

[0201] Glue:

[0202] Polyurethane acrylate

[0203] Substrate: ITO / PET substrate with a vertically aligned polyimide layer

[0204] Mix4, polymerizable monomer, glue, and glass microsphere spacers were mixed evenly at a mass ratio of 45:55:3:0.3 under yellow light conditions to obtain a reverse PDLC material.

[0205] The film-forming process was the same as in Example 1. The haze and transmittance were measured using a WGT-S haze / transmittance meter. When no voltage was applied, the haze was 10%; when an 80V voltage was applied, the haze in the fog state was 83%.

[0206] Compared with Comparative Example 1, for the reverse PDLC device of the present invention, when a 25V voltage was applied, the haze in the fog state was greater than 80%. Compared with the prior art, the driving voltage was significantly improved, achieving the purpose of reducing power consumption and saving energy, and having good application prospects.

[0207] Table 7

[0208]

[0209] Table 8

[0210]

[0211]

[0212] Table 9

[0213]

[0214] Table 10

[0215]

[0216]

[0217] RM 1

[0218] RM 2

[0219] In Table 9, when the content of Formula I in Comparative Example 4 and Comparative Example 5 was 0%, the initial haze increased, and the initial haze exceeded 10%, resulting in a blurred visual effect; and the haze after driving was relatively low, and the light scattering was too poor to achieve the effect of privacy shielding. In Comparative Example 2 and Comparative Example 3, the compound shown in Formula II was absent. Although the initial haze and the haze after driving were comparable to the technical solution of the present invention, the driving voltage was relatively high.

[0220] The mixed crystal dielectric anisotropy of Comparative Example 4 and Comparative Example 5 is -7, while the mixed crystal dielectric anisotropy of Example 4 and Example 5 is -4.5. In a simple liquid crystal system, the driving voltage of Comparative Example 4 and Comparative Example 5 must be lower than that of Example 4 and Example 5. However, in the reverse polymer dispersed liquid crystal mode, the dielectric is not the only factor affecting the driving voltage. The interface between the polymer and the liquid crystal has a strong anchoring effect on the liquid crystal, resulting in an important influence of the interface situation on the driving voltage, and the influence degree exceeds the dielectric of the mixed crystal itself.

[0221] Due to the relatively low clearing point of the compound shown in Formula II and it being a monofunctional polymer liquid crystal monomer (RM), the anchoring force on the liquid crystal is weak, making its driving voltage lower compared to other polymer liquid crystal monomers (RM). However, photopolymerization is a free radical polymerization with a fast polymerization rate, making it difficult to control the polymerization of the monomer of Formula II enriched at the liquid crystal polymer interface. In most cases, most of the monomers of Formula II polymerize inside the polymer and are wrapped by other polymers, resulting in a higher driving voltage, as shown in Comparative Example 4. Through experiments, it was found that controlling the content of Formula I in the mixed crystal can indirectly affect the reaction sequence of Formula II during polymerization, enabling it to be enriched at the polymer / liquid crystal interface for polymerization, and fully exerting its characteristic of reducing the driving voltage to obtain a reverse polymer dispersed liquid crystal with low voltage driving. Because the monomer of Formula I has a strong absorption of ultraviolet light and a large difference in solubility between the monomer of Formula I before and after polymerization and the polymer, it accelerates the polymerization and phase separation process of the liquid crystal and the polymer. The liquid crystal precipitated during the phase separation process contains mixed crystal components and most of the monomers of Formula II. At this time, the free radical content at the polymer / liquid crystal interface is relatively high, and the monomers of Formula II continue to undergo free radical polymerization reactions, forming an interface enriched with the polymer monomers of Formula II, thereby reducing the driving voltage.

[0222] Therefore, compared with the comparative examples, the technical solution of the present invention has a lower driving voltage, achieving the purpose of reducing power consumption and saving energy.

[0223] Table 11

[0224]

[0225] In Table 11, compared with the comparative examples, the technical solution of the present invention has a lower driving voltage while the initial haze is within 10%, the device exhibits a relatively high transparency, and the haze is higher than 80% after driving, showing a good light scattering effect.

[0226] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or variations derived from the technical solution of the present invention still fall within the protection scope of the present invention.

Claims

1. A negative nematic liquid crystal composition, characterized in that, Comprising: 1) One or more compounds of formula I, wherein: R1 and R2 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and one or more -CH2- in R1 may be substituted by cyclopentyl, cyclobutyl or cyclopropyl; n represents 0 or 1, and when n is 0, R1 represents One of Z1 and Z2 represents -C≡C-, and the other represents a single bond, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF- or -CH2O-; Each independently represents and may optionally be substituted with an F atom or a methyl group; 2) One or more compounds of formula II-1 and / or formula II-2, and the clearing point of the compound of formula II-1 and / or II-2 is lower than 50 °C, wherein, R3 represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; R4 represents an alkylene group having 1 to 7 carbon atoms, an alkyleneoxy group having 1 to 7 carbon atoms, an alkenylene group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkylene group having 1 to 7 carbon atoms, a fluorine-substituted alkyleneoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenylene group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; Z3 represents -C≡C-, -CH2-, -CH2CH2-, -CH2CF2-, -COO-, -CH=CH-, -CF=CF-, -CH2O- or a single bond; Z4 represents a single bond or -CH2O-; Each independently represents and may optionally be substituted with an F atom, a methyl group or an ethyl group; P1 represents a methacrylate group or an acrylate group; The compound of formula I is selected from the group consisting of the compounds of formula I-1 to formula I-6 shown below, wherein: R 11 represents R 12 、R 21 each independently represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and one or more CH2 in R 12 may be replaced by a cyclopentyl group, a cyclobutyl group, or a cyclopropyl group; The compound of formula II-1 is selected from the group consisting of the compounds of formula II-1-1 to formula II-1-4 shown below, The compound of formula II-2 is selected from the compound of formula II-2-1 shown below, wherein, R3 represents an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; and one or more CH2 in R 12 , R3 may be substituted by a cyclopentyl group, a cyclobutyl group or a cyclopropyl group; R4 represents an alkylene group having 1 to 7 carbon atoms, an alkyleneoxy group having 1 to 7 carbon atoms, an alkenylene group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkylene group having 1 to 7 carbon atoms, a fluorine-substituted alkyleneoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenylene group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; Z4 represents a single bond or -CH2O; L3 represents an H atom or a methyl group; The negative nematic liquid crystal composition further comprises one or more compounds of formula III, wherein, R5 and R6 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; x represents 0 or 1; Each independently represents and may optionally be substituted with an F atom, a methyl group or an ethyl group; The negative nematic liquid crystal composition further comprises one or more compounds of formula IV, wherein, R7 and R8 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms; L1 and L2 each independently represent an H atom, a Cl atom, an F atom, a methyl group or an ethyl group; Among them, based on the mass percentage of the total mass of Formula I, Formula III and Formula IV, the negative nematic liquid crystal composition contains 30-65% of the compound shown in Formula I, 15-45% of the compound shown in Formula III, and 14-32% of the compound shown in Formula IV; The mass ratio of the total mass of Formula I, Formula III and Formula IV to the compound shown in Formula II-1 and / or Formula II-2 is 1:1-9:

11.

2. The negative nematic liquid crystal composition according to claim 1, wherein, The compound shown in Formula III is selected from the group consisting of the compounds shown in the following Formula III-1 to Formula III-8, wherein, R5 and R6 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms.

3. The negative nematic liquid crystal composition according to claim 1, wherein, The compound shown in Formula IV is selected from the group consisting of the compounds shown in the following Formula IV-1 to Formula IV-5, wherein, R7 and R8 each independently represent an alkyl group having 1 to 7 carbon atoms, an alkoxy group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an alkenyloxy group having 3 to 7 carbon atoms, a fluorine-substituted alkyl group having 1 to 7 carbon atoms, a fluorine-substituted alkoxy group having 1 to 7 carbon atoms, a fluorine-substituted alkenyl group having 2 to 7 carbon atoms, or a fluorine-substituted alkenyloxy group having 3 to 7 carbon atoms.

4. A reverse polymer dispersed liquid crystal material, wherein, It is obtained by crosslinking and curing a negative nematic liquid crystal composition, a polymerizable monomer and an ultraviolet curable glue as described in any one of 1-3 above.

5. A reverse polymer dispersed liquid crystal display device, comprising a first substrate layer, a first conductive layer, a first alignment layer, a liquid crystal layer formed of the reverse polymer dispersed liquid crystal material according to claim 4, a second alignment layer, a second conductive layer, and a second substrate layer, which are sequentially arranged from top to bottom.

6. The reverse polymer dispersed liquid crystal display device according to claim 5, wherein, At least one of the first substrate layer and the second substrate layer has a liquid crystal alignment film for vertically aligning liquid crystals, and the liquid crystal alignment film is obtained from a liquid crystal alignment treatment agent.

7. The reverse polymer dispersed liquid crystal display device according to claim 6, wherein, The liquid crystal alignment treatment agent contains one or more polymers selected from acrylic polymers, methacrylic polymers, novolak resins, polyhydroxystyrene, polyimide precursors, polyimides, polyamides, polyesters, celluloses or polysiloxanes.

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