TW201525108A - Blue phase liquid crystal components and method thereof - Google Patents

Abstract

This invention discloses a method for fabricating blue phase liquid crystal components to solve the problem that the driven voltage of the known blue phase is hard to drop. The method comprises deposing a mixture mixed by a liquid crystal material, a chiral dopant and a monomer between two glass substrate, controlling the temperature of the mixture at a temperature range for the existence of the blue phase liquid, lighting up the mixture by the UV light to make the monomer of the mixture cohere into a polymerization structure involving the liquid crystal and the chiral dopant, cleaning the liquid crystal and the chiral dopant in the polymerization structure, and re-filling the liquid crystal into the polymerization structure. Thus, it can actually resolve the said problem by fabricating the blue phase liquid crystal components to reduce the driving voltage.

Description

Blue phase liquid crystal element and method of manufacturing same

The present invention relates to a blue phase liquid crystal element and a method of fabricating the same; and more particularly to a blue phase liquid crystal element capable of reducing a driving voltage of a device and a method of fabricating the same.

A typical solid undergoes an intermediate state between a solid and a liquid during heating, and this state has a liquid-crystal double property in a certain temperature range, and is called a liquid crystal. Among various liquid crystal phases, a blue phase liquid crystal which appears between the isotropic phase and the Cholesteric Phase is a self-aggregating three-dimensional photonic crystal structure and can be temperature-dependent. Divided into BPI, BPII and BPIII (blue phase liquid crystals composed of different materials and proportions, the temperature ranges of BPI, BPII and BPIII are different), wherein BPIII is a structure with a partial cubic lattice, and BPII and BPI are simple Cubic and body-centered cubic structures. Among them, due to the influence of the electric field, the blue phase liquid crystal may cause changes in lattice or molecular orientation, lattice deformation or phase transition, and may cause a blue phase birefringence effect. Therefore, it is suitable for the production of blue-phase liquid crystal elements, such as liquid crystal displays, and the display using the blue phase liquid crystal has the advantages of not requiring an alignment film and an ultra-high-speed reaction time, and the liquid crystal element can be improved compared with other liquid crystal displays. Product performance.

A method for producing a conventional blue phase liquid crystal element (for example, US2013/0020023A1, CN102652167A, etc.) is mainly provided by providing a liquid crystal material (for example, nematic liquid crystal, etc.) and a swirling substance between two glass substrates (Glass Substrate). Chiral dopant) and polymer monomer a mixture of (monomer), after the mixture is allowed to settle at a temperature range in which the blue phase liquid crystal exists, and then irradiated with ultraviolet ray (UV Irradiation) to form a polymerization reaction between the polymer monomers and the two glass substrates. And producing a polymer stabilized structure, the structure is a tree structure having a plurality of branches, and the pores formed between the plurality of branches are connected to each other (refer to the literature shown in Table 1). The conventional blue phase liquid crystal element is formed by accommodating the liquid crystal material and the spin-on substance. Wherein, the cyclizing substance can assist the liquid crystal material to produce optical rotation, but the presence of the spheroidal substance in the pores of the polymer stable structure will increase the driving voltage of the conventional blue phase liquid crystal element, thereby causing the conventional blue The power consumption of the phase liquid crystal element cannot be reduced.

In view of the above, in the practical application of the blue phase liquid crystal element manufactured by the conventional method for manufacturing a blue phase liquid crystal element, in addition to the problem that the "device driving voltage cannot be lowered", there is a concern that "the power consumption cannot be lowered", and the actual use is At the time, there are many limitations and shortcomings. There are inconveniences and further improvements are needed to enhance their practicality.

The main object of the present invention is to provide a blue phase that can reduce the driving voltage of components. A method of manufacturing a liquid crystal element.

A second object of the present invention is to provide a blue phase liquid crystal cell which can reduce the driving voltage of a device.

The invention provides a method for manufacturing a blue phase liquid crystal element, comprising: placing a mixture of a liquid crystal material, a swirling substance and a polymer monomer between two glass substrates, and controlling the temperature of the mixture to exist in the blue phase liquid crystal. In the temperature range; irradiating the mixture with ultraviolet light to agglomerate the polymer monomer in the mixture to form a polymer structure, the polymer structure containing the liquid crystal material and the spin-active substance; removing the liquid crystal material and the spin property in the polymer structure Substance; and refilling the liquid crystal material into the above polymeric structure.

Preferably, the above polymeric structure is immersed in a solution to remove liquid crystal materials and spheroidal materials in the polymeric structure.

Preferably, the mixture is mixed with 10 to 15% by weight of a polymer monomer from a nematic liquid crystal and a cholesteric liquid crystal having a spheroidal substance to form a cholesteric liquid crystal prepolymer.

Preferably, the liquid crystal material is a composition of 50% by weight of JC1041XX and 38.5% by weight of 5CB, and the cyclizing substance is 11.5% by weight of R1011.

Preferably, the composition of JC1041XX, 5CB and R1011 accounts for 87.1% of the above mixture, the polymer monomer accounts for 12.9% of the mixture, and the polymer monomer is 7.1 wt% of RM257, 5.4 wt% of TMPTA And a composition of 0.4% by weight of DMPAP.

Preferably, the liquid crystal material is 65 wt% of Merck BL038, and the rotatory material is 25 wt% of CB15 and 10 wt% of ZLI-4572.

Preferably, the composition of Merck BL038, CB15 and ZLI-4572 accounts for 85-91% of the above mixture, the polymer monomer accounts for 9-15% of the above mixture, and the polymer monomer is RM257, TMPTA and DMPAP is mixed into a composition of 9 to 15% by weight.

Preferably, the liquid crystal material is 60% by weight of E48, and the rotatory substance is 40% by weight of S811.

Preferably, the composition of E48 and S811 accounts for 87.1% of the above mixture, the polymer monomer accounts for 12.9% of the above mixture, and the polymer monomer is a composition of RM257, TMPTA and DMPAP mixed with 12.9% by weight.

Preferably, the liquid crystal material is 95.5 wt% of HCBP-006, and the cyclable substance is 4.5 wt% of R5011.

Preferably, the composition of HCBP-006 and R5011 accounts for 91.5% of the above mixture, the polymer monomer accounts for 8.5% of the above mixture, and the polymer monomer is composed of RM257, TMPTA and DMPAP mixed with 8.5 wt%. Things.

Preferably, one of the two glass substrates is placed on a temperature control device to control the temperature of the mixture within a temperature range in which the blue phase liquid crystal is present.

Preferably, the two glass substrates respectively have a transparent conductive film, and the mixture is disposed between the two transparent conductive films.

The invention further provides a blue phase liquid crystal element comprising: a two glass substrate; and a polymer structure disposed between the two glass substrates, the polymer structure accommodating a blue phase liquid crystal material, and the polymer structure has no spin-form substance.

Preferably, the polymeric structure is a dendritic structure having a plurality of branches, the pores formed between the plurality of branches communicating with each other to accommodate the blue phase liquid crystal material.

Preferably, the blue phase liquid crystal element is provided with at least one clamping member, and the clamping member holds the two glass substrates.

〔this invention〕

1‧‧‧ glass substrate

11‧‧‧Transparent conductive film

2‧‧‧Aggregate structure

3‧‧‧Clamping parts

A1~A7‧‧‧ drive voltage curve

C, C’‧‧‧ liquid crystal materials

H‧‧‧temperature control device

L‧‧‧UV light

M‧‧‧Mixture

P1~P3‧‧‧ polymer monomer

Q‧‧‧solution

S1‧‧‧ Temperature control steps

S2‧‧‧polymerization step

S3‧‧‧Clearing steps

S4‧‧‧ injection step

Fig. 1 is a manufacturing flow chart of an embodiment of a method for producing a blue phase liquid crystal cell of the present invention.

Fig. 2 is a flow chart (1) showing an embodiment of a method for producing a blue phase liquid crystal cell of the present invention.

Fig. 3 is a schematic flow chart (2) of an embodiment of a method for producing a blue phase liquid crystal cell of the present invention.

Fig. 4 is a flow chart (3) showing an embodiment of a method for producing a blue phase liquid crystal cell of the present invention.

Fig. 5 is a flow chart (4) showing an embodiment of a method for producing a blue phase liquid crystal cell of the present invention.

Fig. 6 is a flow chart (5) showing an embodiment of a method for producing a blue phase liquid crystal cell of the present invention.

Figure 7 is a cross-sectional view showing an embodiment of the blue phase liquid crystal cell of the present invention.

Fig. 8 is a graph showing the driving voltage of the embodiment of the blue phase liquid crystal cell of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; A chiral dopant, also referred to as a chiral substance, refers to a substance that is used to assist in the production of optical activity in a liquid crystal material (eg, nematic liquid crystal), as will be understood by those of ordinary skill in the art to which the present invention pertains.

The "JC1041XX" described throughout the present invention refers to a liquid crystal which can be understood by those having ordinary knowledge in the technical field to which the present invention pertains.

"5CB" as used throughout the present invention refers to a liquid crystal which can be understood by those of ordinary skill in the art to which the present invention pertains.

The term "RM257" as used throughout the present invention refers to a polymer monomer which is understood by those of ordinary skill in the art to which the present invention pertains.

"TMPTA" as used throughout the present invention refers to a polymer monomer which will be understood by those of ordinary skill in the art to which the present invention pertains.

"DMPAP" as used throughout the present invention refers to a photoinitiator that can be understood by those of ordinary skill in the art to which the present invention pertains.

"Merck BL038" as used throughout the present invention refers to a liquid crystal which can be understood by those of ordinary skill in the art to which the present invention pertains.

"CB15" as used throughout the present invention refers to a liquid crystal, which belongs to the present invention. Those of ordinary skill in the art will understand.

"ZLI-4572" as used throughout the present invention refers to a rotatory substance which can be understood by those of ordinary skill in the art to which the present invention pertains.

"E48" as used throughout the present invention refers to a liquid crystal which can be understood by those of ordinary skill in the art to which the present invention pertains.

The term "S811" as used throughout the present invention refers to a rotatory substance which can be understood by those of ordinary skill in the art to which the present invention pertains.

The "HCBP-006" as used throughout the present invention refers to a liquid crystal which can be understood by those of ordinary skill in the art to which the present invention pertains.

The term "R5011" as used throughout the present invention refers to a rotatory substance which can be understood by those of ordinary skill in the art to which the present invention pertains.

Referring to Fig. 1, there is shown a manufacturing flow chart of an embodiment of a method for producing a blue phase liquid crystal cell of the present invention. The method for manufacturing the blue phase liquid crystal element includes a temperature control step S1, a polymerization step S2, a cleaning step S3, and a seeding step S4, which will be described later.

The temperature control step S1 is a mixture of a liquid crystal, a chiral dopant and a polymer monomer placed between two glass substrates to control the temperature of the mixture to blue. The phase of the liquid crystal exists within the temperature range. In detail, please refer to FIG. 2, in which a liquid crystal material C (eg, nematic liquid crystal, etc.) or a swirling substance can be poured between two glass substrates (Glass Substrate) 1 (not shown) And a mixture M of polymer monomers P1 to P3. Wherein, the mixture M may be mixed with about 10 to 15% by weight of a polymer monomer from a nematic liquid crystal and a cholesteric liquid crystal having a spheroidal substance to form a liquid crystal prepolymer having a pitch of 200 to 350 nanometers (nm). The embodiment of the mixture of the liquid crystal material, the cyclizing substance and the polymer monomer is, for example, the following, but not limited thereto. The first aspect: the liquid crystal material may be selected from the group consisting of JC1041XX (50wt%) and 5CB (38.5wt%), and the spin-active substance may be selected from R1011 (11.5wt%) to form JC1041XX, 5CB and R1011. group The composition of JC1041XX, 5CB and R1011 is taken out as 87.1% of the above mixture M, and the polymer monomer is added as 12.9% of the above mixture M, such as RM257 (7.1 wt%), TMPTA (5.4 wt%) and A composition of DMPAP (0.4 wt%) to be a mixture M of the liquid crystal material, the cyclized substance, and the polymer monomer. The second aspect: the liquid crystal material may be selected as Merck BL038 (65 wt%), and the spin-active substance may be selected from the composition of CB15 (25 wt%) and ZLI-4572 (10 wt%) to form Merck BL038, CB15 and For the composition of ZLI-4572, the composition of Merck BL038, CB15 and ZLI-4572 is taken out as 85-91% of the above mixture M, and the polymer monomer is added as 9-15% of the above mixture M, such as: RM257, TMPTA And DMPAP is mixed into a composition of 9 to 15% by weight to form a mixture M of a liquid crystal material, a cyclized substance, and a polymer monomer. The third aspect: the liquid crystal material may be selected from E48 (60 wt%), and the spin-active material may be selected as S811 (40 wt%) to form a composition of E48 and S811, and the composition of the E48 and S811 is taken out as the above. 87.1% of the mixture M (ie, liquid polycondensation mixture), adding polymer monomer as 12.9% of the above mixture M (ie liquid cyclodization mixture), such as: RM257, TMPTA and DMPAP mixed with 12.9 wt% of the composition, to be mixed A mixture M of a liquid crystal material, a cyclized substance, and a polymer monomer. The fourth aspect: the liquid crystal material may be selected as HCBP-006 (95.5 wt%), and the spin-active substance may be selected as R5011 (4.5 wt%) to form a mixture of HCBP-006 and R5011, and the HCBP-006 is taken out. And a mixture of R5011 as 91.5% of the above mixture M, the polymer monomer is added as 8.5% of the above mixture M, such as: RM257, TMPTA and DMPAP are mixed to form an 8.5 wt% composition to mix liquid crystal materials, spinous substances and Mixture M of polymer monomers. In this embodiment, the liquid crystal material is a composition of JC1041XX (50 wt%) and 5 CB (38.5 wt%); the rotatory substance is R1011 (11.5 wt%); 87.1% of the liquid crystal material and the mixture of the spirulina are to be taken out. Thereafter, 12.9% of the polymer monomer is added, which may be selected from the group consisting of RM257 (7.1 wt%), TMPTA (5.4 wt%) and DMPAP (0.4 wt%), but not limited thereto. In addition, the two glass substrates 1 have a transparent conductive film (ITO) 11 for the mixture M to be disposed between the two transparent conductive films 11. Then, one of the glass substrates 1 is placed in a temperature control On a device (eg, Hot Stage, etc.) H, the mixture M is thermostated to a temperature range in which a blue phase liquid crystal (eg, BPI, BPII, or BPIII) exists to produce a blue phase liquid crystal element, wherein the temperature control method is well known. The skilled artisan can understand that it is not described here.

In the polymerization step S2, the mixture is irradiated with ultraviolet light (UV Irradiation) to agglomerate the polymer monomer in the mixture to form a polymerization structure in which the liquid crystal material and the spheroidal substance are contained. In detail, please refer to FIG. 3, in which the polymer P1~P3 contained in the mixture M is irradiated by the ultraviolet light L, and will be polymerized to be hardened to form the polymer structure 2, and the polymer structure is formed. 2 is a tree-like structure having a plurality of branches, and the pores formed between the plurality of branches are connected to each other (refer to the literature shown in Table 1) to accommodate the liquid crystal material C and the swirling substance (not shown). . Among them, the irradiation time of ultraviolet light is well understood by those skilled in the art, and will not be described here.

The removing step S3 removes the liquid crystal material and the swirling substance in the above-mentioned polymerization structure. In detail, first, please refer to FIG. 4, in which one of the glass substrates 1 can be picked up to separate the polymer structure 2 from the glass substrate 1 above; then, the liquid crystal material C contained in the polymer structure 2 is And the spin-off substance (not shown) is removed, for example, the polymer structure 2 is immersed in a solution Q (as shown in FIG. 5), such as acetone or n-hexane, depending on different polymer materials and glass substrates. The size can be matched with different concentrations and soaking time, so that the liquid crystal material C and the swirling substance in the polymer structure 2 are completely removed from the pores to retain the three-dimensional structure (3D structure) of the blue phase liquid crystal.

The seeding step S4 refills the liquid crystal material into the above-mentioned polymeric structure. In detail, please refer to FIG. 6 , wherein the above-mentioned swirling substance and liquid crystal material are completely absent in the pores of the polymer structure 2, so that the temperature of the blue phase liquid crystal can be controlled in the temperature control device H. In the case of a range, another liquid crystal material C' (the composition of which is substantially the same as the above liquid crystal material C) is poured into the pores of the polymer structure 2 such that the pores of the polymer structure 2 have only the blue phase liquid crystal material C', and The above-mentioned cyclized substance is not present in the polymeric structure 2. Then, you can The glass substrate 1 picked up in the cleaning step S3 covers the polymer structure 2, and the polymer structure 2 having only the liquid crystal material C' and the two glass substrates 1 together constitute a blue phase liquid crystal element (as shown in Fig. 7). In addition, the blue phase liquid crystal element is preferably provided with at least one clamping member 3, the clamping member 3 can clamp the two glass substrates 1 to fix the polymeric structure 2 between the two glass substrates 1 (such as 7 is shown) to prevent the liquid crystal material C from escaping from the polymeric structure 2.

Referring to Fig. 8, it is a graph showing the driving voltage of the embodiment of the blue phase liquid crystal device of the present invention. Among them, A1~A7 are respectively R1011 (22.0wt%), R1011 (18.0wt%), R1011 (11.5wt%), R1011 (5.0wt%), w/o Ch-D (liquid crystal without any thixotropy) ), S1011 (2.0 wt%) and S1011 (4.0 wt%) as driving voltage curves of the blue phase liquid crystal element produced by the above-mentioned cyclized substance. As can be seen from the figure, as the concentration of the spheroidal substance is higher, the driving voltage of the blue phase liquid crystal element is higher, and the blue phase liquid crystal element of the present invention completely excludes the spheroidal substance in the above polymerized structure, thereby making the polymer structure The pores only contain the above liquid crystal material, and the driving voltage of the blue phase liquid crystal element of the present invention can be greatly reduced as compared with the conventional blue phase liquid crystal element having a cyclizing substance.

The main features of the embodiment of the method for manufacturing a blue phase liquid crystal device of the present invention are as follows: First, a mixture of a liquid crystal material, a swirling substance and a polymer monomer is placed on a two glass substrate. Between, controlling the temperature of the mixture in a temperature range in which the blue phase liquid crystal exists; then, irradiating the mixture with ultraviolet light to agglomerate the polymer monomer in the mixture to form a polymer structure in which the liquid crystal material is accommodated And a spinning substance; thereafter, the liquid crystal material and the swirling substance in the polymerized structure are removed; finally, the liquid crystal material is re-perfused into the polymerized structure to form the blue phase liquid crystal element embodiment of the present invention. Wherein, the blue phase liquid crystal element comprises: a two glass substrate; and a polymer structure disposed between the two substrates, the polymer structure is a tree structure having a plurality of branches, and pores formed between the plurality of branches Interconnected to accommodate the blue phase liquid crystal material, and the polymer structure has no spin-form material. Moreover, the blue phase liquid crystal element is preferably provided with at least one clamping member, the clamping member can clamp the two glass substrates to The structure is fixed between the two glass substrates. Thereby, the squeaky substance removal of the element driving voltage can be improved to lower the driving voltage of the blue phase liquid crystal element.

In the embodiment of the method for manufacturing a blue phase liquid crystal device of the present invention, a blue phase liquid crystal element having a low driving voltage can be manufactured, and a blue phase liquid crystal display can be produced by using the blue phase liquid crystal element, thereby achieving "reduction of power consumption" and "no alignment" Membrane and "fast reaction time".

While the present invention has been disclosed in the above embodiments, it is not intended to limit the scope of the present invention. The scope of protection of the invention is therefore defined by the scope of the appended claims.

S1‧‧‧ Temperature control steps

S2‧‧‧polymerization step

S3‧‧‧Clearing steps

S4‧‧‧ injection step

Claims (16)

A method for manufacturing a blue phase liquid crystal element, comprising: placing a mixture of a liquid crystal material, a cyclizing substance and a polymer monomer between two glass substrates, and controlling the temperature of the mixture to be within a temperature range in which the blue phase liquid crystal exists Irradiating the mixture with ultraviolet light to agglomerate the polymer monomer in the mixture to form a polymerization structure, wherein the polymer structure contains the liquid crystal material and the cyclable substance; and the liquid crystal material and the spheroidal substance in the polymer structure are removed; And refilling the liquid crystal material into the above polymeric structure. The method for producing a blue phase liquid crystal cell according to the above aspect of the invention, wherein the polymerized structure is immersed in a solution to remove a liquid crystal material and a swirling substance in the polymerized structure. The method for producing a blue phase liquid crystal device according to claim 1, wherein the mixture is mixed with 10 to 15% by weight of a polymer monomer from a nematic liquid crystal and a cholesteric liquid crystal having a spheroidal substance to form a cholesterol. Liquid crystal prepolymer. The method for producing a blue phase liquid crystal cell according to claim 1, wherein the liquid crystal material is a composition of 50% by weight of JC1041XX and 38.5 wt% of 5CB, and the cyclable substance is 11.5% by weight of R1011. The method for producing a blue phase liquid crystal cell according to the fourth aspect of the invention, wherein the composition of the JC1041XX, 5CB and R1011 accounts for 87.1% of the mixture, the polymer monomer accounts for 12.9% of the mixture, and the polymerization The monomer was 7.1 wt% of RM257, 5.4 wt% of TMPTA, and 0.4 wt% of DMPAP. The method for producing a blue phase liquid crystal cell according to claim 1, wherein the liquid crystal material is 65 wt% of Merck BL038, and the rotatory material is 25 wt% of CB15 and 10 wt% of ZLI-4572. A method of manufacturing a blue phase liquid crystal element according to claim 6, wherein The composition of Merck BL038, CB15 and ZLI-4572 accounts for 85-91% of the above mixture, the polymer monomer accounts for 9-15% of the above mixture, and the polymer monomer is RM257, TMPTA and DMPAP are mixed 9~15wt % composition. The method for producing a blue phase liquid crystal cell according to claim 1, wherein the liquid crystal material is 60% by weight of E48, and the rotatory substance is 40% by weight of S811. The method for producing a blue phase liquid crystal device according to claim 8, wherein the composition of E48 and S811 accounts for 87.1% of the mixture, the polymer monomer accounts for 12.9% of the mixture, and the polymer sheet The body was RM257, TMPTA and DMPAP mixed with a composition of 12.9% by weight. The method for producing a blue phase liquid crystal cell according to the above aspect of the invention, wherein the liquid crystal material is 95.5 wt% of HCBP-006, and the rotatory substance is 4.5 wt% of R5011. The method for producing a blue phase liquid crystal element according to claim 10, wherein the composition of the HCBP-006 and R5011 accounts for 91.5% of the mixture, the polymer monomer accounts for 8.5% of the mixture, and the polymerization The monomer was RM257, TMPTA and DMPAP mixed with 8.5 wt% of the composition. A method of manufacturing a blue phase liquid crystal cell according to claim 1, wherein one of the two glass substrates is placed on a temperature control device to control the temperature of the mixture in a temperature range in which the blue phase liquid crystal exists. The method for producing a blue phase liquid crystal cell according to the first aspect of the invention, wherein the two glass substrates each have a transparent conductive film, and the mixture is disposed between the two transparent conductive films. A blue phase liquid crystal element comprising: a two glass substrate; and a polymeric structure disposed between the two glass substrates, the blue phase being accommodated in the polymeric structure A liquid crystal material, and the structure is free of a swirling substance. The blue phase liquid crystal cell according to claim 14, wherein the polymer structure is a tree structure having a plurality of branches, and pores formed between the plurality of branches are connected to each other to accommodate the blue phase liquid crystal material. . The blue phase liquid crystal cell according to claim 14, wherein the blue phase liquid crystal cell is provided with at least one sandwiching member that sandwiches the two glass substrates.