WO2017008585A1

WO2017008585A1 - Polymer-liquid crystal composition, and liquid crystal handwriting display device and preparation method

Info

Publication number: WO2017008585A1
Application number: PCT/CN2016/083957
Authority: WO
Inventors: 何应军
Original assignee: 深圳市景世源科技有限公司
Priority date: 2015-07-15
Filing date: 2016-05-30
Publication date: 2017-01-19
Also published as: CN105062505B; CN105062505A

Abstract

Disclosed are a polymer-liquid crystal composition and a liquid crystal handwriting display device using same. The polymer-liquid crystal composition comprises a polymer and a liquid crystal which are mutually soluble, wherein the polymer comprises 30-70 parts of an oligomer monomer, 0.5-3 parts of a photoinitiator, 30-70 parts of an oligomer, 0.1-1 part of an adhesion enhancer and 5-50 parts of a diluent. Also disclosed is a preparation method for the liquid crystal handwriting device. The liquid crystal handwriting display device using the polymer and the bistable cholesteric liquid crystal of the present invention has a high display contrast and a low driving voltage, and is sensitive to handwriting. Furthermore, the handwriting display device does not consume electricity in a handwriting display process and consumes electricity only at a refresh moment. Handwriting refresh of the handwriting display device can be performed millions of times, and the handwriting display device is an environmentally friendly handwriting display device.

Description

Polymer liquid crystal composition and liquid crystal handwriting display device and preparation method thereof

Technical field

The invention belongs to the field of liquid crystal display, and in particular relates to a polymer liquid crystal composition for a liquid crystal handwriting display device and a preparation method of the handwritten display device.

Background technique

Liquid crystal is a kind of material state between solid and liquid. It has liquidity and crystal order in a certain degree. According to the arrangement of molecules, it can be divided into nematic and smectic. There are three types of cholesteric liquid crystals, in which the cholesteric liquid crystals are flat and arranged in layers. The molecules in the layers are parallel to each other. The long axis of the molecules is parallel to the plane of the layer. The long axis of the molecules in different layers changes slightly, along the normal of the layers. The directions are arranged in a spiral structure. The thread distance of the cholesteric liquid crystal is about 300 nm, which is the same order of magnitude as the visible light wavelength. This pitch varies with the external temperature, the electric field condition, and the twisting force of the liquid crystal. Therefore, the external light can be modulated by adjusting the pitch.

In recent years, people have developed a variety of new display devices using the optical rotation, selectivity, light scattering, and circular polarization dichroism of cholesteric liquid crystals. The handwriting display device utilizes the bistable characteristics of cholesteric liquid crystals. A display device developed, the so-called bistable state refers to two steady states that exist without an applied electric field: a planar state and a focal conic state, both of which can be stabilized without an applied electric field. They show a bright state or a dark state respectively. When a certain pressure is applied, the liquid crystal molecular arrangement of the force-receiving part changes, the Bragg reflection effect is generated, the pressure trajectory is recorded, and the display screen only needs a weak current when driving the refresh, thereby realizing The low power consumption of the product. However, in the prior art, the bistable cholesteric liquid crystal handwriting display device has lower display contrast and higher driving voltage, thereby higher energy consumption, and the adhesion between the liquid crystal and the polymer and the upper and lower films is not strong, and the handwriting display is The device is easy to crack and break.

Summary of the invention

Therefore, the technical problem to be solved by the present invention lies in the prior art, the bistable cholesteric liquid crystal hand The writing display device has low display contrast, high driving voltage, strong adhesion between liquid crystal and polymer and upper and lower film, and the handwriting device is easy to crack and break, thereby proposing a polymer liquid crystal composition for handwritten liquid crystal display device and preparation method thereof .

In order to solve the above technical problem, the technical solution of the present invention is:

The present invention provides a polymer liquid crystal composition comprising a miscible polymer and a liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

30-70 parts of oligomer monomer;

Photoinitiator 0.5-3 parts;

30-70 parts of oligomer;

Adhesion enhancer 0.1-1 part;

Thinner 5-50 parts.

Preferably, the composition comprises, in parts by weight, the following components:

40-60 parts of oligomer monomer;

1-2 parts of photoinitiator;

40-60 parts of oligomer;

Adhesion enhancer 0.4-0.8 parts;

20-40 parts of diluent.

Preferably, the mass ratio of the polymer to the liquid crystal is from 15% to 60%: 85% to 40%.

Preferably, the oligomer monomer is a monofunctional acrylate monomer, a monofunctional methacrylate monomer, a bifunctional acrylate monomer, a difunctional methacrylate monomer, a trifunctional acrylic acid. One or more of an ester monomer and a polyfunctional acrylate monomer.

Preferably, the oligomer is one or more of a urethane acrylate oligomer, a polyester acrylate oligomer, a polyether acrylate oligomer, and an unsaturated polyester oligomer, the low Polymer cured The Shore hardness after polymerization is between 10A and 50D.

Preferably, the photoinitiator is 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl One or more of 1-phenyl-1-propanone; the adhesion enhancer is one of 2-hydroxyethyl methacrylate phosphate, tricyclodecane dimethanol dimethacrylate Or both; the diluent is an acrylate monomer having a viscosity of less than 200 CPS.

Preferably, the liquid crystal is a bistable cholesteric liquid crystal.

The present invention also provides a method of preparing the polymer liquid crystal composition, comprising the steps of:

(1) adding an oligomer monomer to a reaction vessel in a dark room or a yellow light environment, and then sequentially adding an oligomer, an adhesion enhancer and a diluent at room temperature and stirring the obtained mixture uniformly;

(2) adding a photoinitiator, stirring until the photoinitiator is completely dissolved in the mixture obtained in the step (1) to obtain a polymer;

(3) mixing the polymer and the bistable cholesteric liquid crystal at 15-35 ° C in a dark room or a yellow light environment until the two are mutually soluble to form a clear mixture;

(4) adding a spacer powder having a particle diameter of 2 to 20 μm to the mixed liquid clarified in the step (3), stirring until the spacer powder is uniformly distributed in the mixed liquid, thereby obtaining the polymer liquid crystal combination Things.

Further, the present invention provides a liquid crystal handwriting display device comprising the polymer liquid crystal composition.

The invention also provides a method for preparing the liquid crystal handwriting display device, comprising the following steps:

(1) applying the polymer liquid crystal composition between two ITO conductive films or conductive glasses by a roll pressing method or a coating method to obtain a liquid crystal handwritten film semi-finished product;

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 0.1 to 5 MW/cm ² and a wavelength of 200 to 400 nm for 1-5 minutes to obtain a cured liquid crystal hand-written film;

(3) The liquid crystal handwriting film is cut into a desired size and assembled and assembled with the driving circuit and the bottom plate casing, that is, the liquid crystal handwriting display device is obtained.

The above technical solution of the present invention has the following advantages over the prior art:

(1) The polymer liquid crystal composition of the present invention comprises a miscible polymer and a liquid crystal, wherein the polymer comprises the following components: an oligomer monomer, a photoinitiator, an oligomer, and an adhesion enhancer. And the diluent, the preparation method of the polymer is simple and mild, and is advantageous for industrial production; the liquid crystal handwriting display device using the polymer and the bistable cholesteric liquid crystal according to the invention has high display contrast, low driving voltage and sensitive writing. Moreover, the handwriting display device does not need to consume electricity during the display process of the writing, and only uses electricity at the instant of refreshing, and the writing refresh can reach millions of times, which is an environment-friendly writing display device.

(2) The method for preparing a liquid crystal handwriting display device according to the present invention is simple in process and easy to operate, and the liquid crystal handwriting display device is provided with a spacer powder which can support the polymer and the liquid crystal during the preparation process. The polymer and the liquid crystal are uniformly coated between the ITO conductive film and the ITO conductive glass, thereby making the interval between the ITO conductive film and the ITO glass uniform. And the polymer is cured by ultraviolet light, and a void of 1-10 μm is formed during the curing process, which disperses the cholesteric liquid crystal in the polymer, and also bonds the ITO conductive film and/or the ITO conductive glass. Together, the degree of firmness of the device is increased, and the problem that the adhesion between the polymer and the liquid crystal and the upper and lower films is not strong and the handwriting display device is easily cracked and broken is solved.

DRAWINGS

1 is a pressure sensing diagram of a liquid crystal handwriting display device according to the present invention;

2 is a voltage refresh diagram of the liquid crystal handwriting display device of the present invention.

detailed description

In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings

3 is a pressure sensing diagram of the liquid crystal handwriting display device of the present invention;

4 is a voltage refresh diagram of the liquid crystal handwriting display device of the present invention.

Example 1

The present embodiment provides a polymer liquid crystal composition comprising a polymer having a mass ratio of 15%: 85% miscible and a cholesteric liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

Oligomer monomer: 30 parts of lauric acid acrylate, the molecular formula is:

Photoinitiator: 2 parts, 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide, the molecular formula is:

Oligomer: 30 parts of the type 6127 oligomer purchased from Taiwan Changxing Chemical Co., Ltd., the hardness after curing is 90A;

Diluent: 5 parts of ethoxyethoxyethyl acrylate having a viscosity of 150 CPS, and its molecular formula is:

Adhesion enhancer: 0.1 parts of 2-hydroxyethyl methacrylate phosphate, the molecular formula of 2-hydroxyethyl methacrylate phosphate is:

The embodiment further provides a preparation method of the polymer liquid crystal composition, comprising the following steps:

(1) adding lauric acid acrylate to the reaction vessel in a dark room, and then sequentially adding 6127, 2-hydroxyethyl methacrylate phosphate and ethoxyethoxyethyl acrylate at 20 ° C and obtaining Stir the mixture evenly;

(2) adding 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide, stirring until the 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide is completely dissolved in In the mixture obtained in the step (1), a polymer is obtained;

(3) mixing and stirring the polymer and the bistable cholesteric liquid crystal at 15 ° C in a yellow light environment until the two are mutually soluble to form a clear mixed liquid;

(4) A spacer powder having a particle diameter of 2 μm is added to the mixed liquid clarified in the step (3), and stirred until the spacer powder is uniformly distributed in the mixed liquid to obtain the polymer liquid crystal composition.

Further, the embodiment further provides a liquid crystal handwriting display device comprising the polymer liquid crystal composition.

The method for preparing the liquid crystal handwriting display device comprises the following steps:

(1) applying the polymer liquid crystal composition between two ITO conductive films by a roll pressing method to obtain a liquid crystal handwritten film semi-finished product;

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 0.1 MW/cm ² and a peak wavelength of 200 nm for 1 min to obtain a cured liquid crystal hand-written film;

Example 2

The present embodiment provides a polymer liquid crystal composition comprising a polymer having a mass ratio of 60%:40% miscible and a cholesteric liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

Oligomer monomer: 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate 30 parts, tetrahydroanthracene 40 parts of acrylate, wherein the 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate has the formula:

The tetrahydrofurfuryl acrylate has the formula:

Photoinitiator: 3-hydroxy-cyclohexyl-phenyl ketone 3 parts, the molecular formula is:

Oligomer: 20 parts of the 6070 oligomer purchased from Taiwan Changxing Chemical Co., Ltd., the hardness after curing is 87A, the model is DR-028FS oligomer 20 parts, the hardness after curing is 85A, the model is 30113 oligomers 30 parts, the hardness after curing is 40A;

Diluent: 50 parts of 2-phenoxyethyl acrylate having a viscosity of 180 CPS, and its molecular formula is:

Adhesion enhancer: 1 part of tricyclodecane dimethanol dimethacrylate, the molecular formula is:

(1) Add 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate and tetrahydrofurfuryl acrylate to a reaction vessel in a dark room, and then sequentially add 6070, DR-028FS at 25 °C. , 6113, tricyclodecane dimethanol dimethacrylate and 2-phenoxyethyl acrylate, and the resulting mixture is stirred uniformly;

(2) adding 1-hydroxy-cyclohexyl-phenyl ketone, stirring until the 1-hydroxy-cyclohexyl-phenyl ketone is completely dissolved in the mixture obtained in the step (1) to obtain a polymer;

(3) mixing and stirring the polymer and the bistable cholesteric liquid crystal at 40 ° C in a yellow light environment until the two are mutually soluble to form a clear mixed liquid;

(4) A spacer powder having a particle diameter of 20 μm is added to the mixed liquid clarified in the step (3), and stirred until the spacer powder is uniformly distributed in the mixed liquid to obtain the polymer liquid crystal composition.

(1) coating the polymer liquid crystal composition between a sheet of ITO conductive film and a sheet of ITO conductive glass by a roll pressing method to obtain a liquid crystal hand-held film semi-finished product;

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 5 MW/cm ² d and a peak wavelength of 400 nm for 5 minutes to obtain a cured liquid crystal hand-written film;

Example 3

The present embodiment provides a polymer liquid crystal composition comprising a polymer having a mass ratio of 40%:60% miscible and a cholesteric liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

Oligomer monomer: 20 parts of stearic acid acrylate, 30 parts of isobornyl methacrylate, The molecular formula of the stearic acid acrylate is:

The molecular formula of the isobornyl methacrylate is:

Photoinitiator: 1.5 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, the molecular formula is:

Oligomer: 20 parts of the DR-U390 oligomer purchased from Taiwan Changxing Chemical Co., Ltd., the hardness after curing is 70A, the model is 6148 oligomer 10 parts, the hardness after curing is 21A, the model is 20176 oligomers 20 parts, the hardness after curing is 21A;

Diluent: 20 parts of ethoxyethoxyethyl acrylate having a viscosity of 100 CPS, and 10 parts of 2-phenoxyethyl acrylate;

Adhesion enhancer: 0.3 parts of 2-hydroxyethyl methacrylate phosphate, 0.3 parts of tricyclodecane dimethanol dimethacrylate.

(1) Add stearic acid acrylate and isobornyl methacrylate to a reaction vessel in a dark room, and then sequentially add DR-U390, 6148, 6176, 2-hydroxyethyl methacrylate phosphoric acid at 20 °C. Ester, Cyclodecane dimethanol dimethacrylate, ethoxyethoxyethyl acrylate and 2-phenoxyethyl acrylate, and the resulting mixture is stirred uniformly;

(2) adding 2-hydroxy-2-methyl-1-phenyl-1-propanone, stirring until the 2-hydroxy-2-methyl-1-phenyl-1-propanone is completely dissolved in the step (1) In the mixture obtained, a polymer is obtained;

(3) mixing and stirring the polymer and the bistable cholesteric liquid crystal at 25 ° C in a yellow light environment until the two are mutually soluble to form a clear mixed liquid;

(4) A spacer powder having a particle diameter of 10 μm is added to the mixed liquid clarified in the step (3), and stirred until the spacer powder is uniformly distributed in the mixed liquid to obtain the polymer liquid crystal composition.

(1) coating the polymer liquid crystal composition between two ITO conductive films by a coating method to obtain a liquid crystal hand-held film semi-finished product;

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 3 MW/cm ² and a peak wavelength of 400 nm for 3 minutes to obtain a cured liquid crystal hand-written film;

Example 4

The present embodiment provides a polymer liquid crystal composition comprising a polymer having a mass ratio of 35%:65% miscible and a cholesteric liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

Oligomer monomer: 5 parts of 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate, 40 parts of tetrahydrofurfuryl acrylate,

Photoinitiator: 2 parts of 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide;

Oligomer: 40 parts of the 6148 oligomer purchased from Taiwan Changxing Chemical Co., Ltd. After curing, the hardness is 21A, the model is 6113 oligomer 10 parts, and the hardness after curing is 40A;

Diluent: 5 parts of 2-phenoxyethyl acrylate having a viscosity of 180 CPS;

Adhesion enhancer: 0.3 parts of 2-hydroxyethyl methacrylate phosphate.

(1) Add 2-(p-isopropylphenyl-phenoxy)-ethyl acrylate and tetrahydrofurfuryl acrylate to a reaction vessel in a dark room, and then sequentially add 6148, 6113, 2 at 25 °C. - hydroxyethyl methacrylate phosphate and 2-phenoxyethyl acrylate and stirring the resulting mixture uniformly;

(3) mixing and stirring the polymer and the bistable cholesteric liquid crystal at 23 ° C in a yellow light environment until the two are mutually soluble to form a clear mixed liquid;

(4) adding a spacer powder having a particle diameter of 4.5 μm to the mixed liquid clarified in the step (3), stirring until the spacer powder is uniformly distributed in the mixed liquid, thereby obtaining the polymer liquid crystal composition .

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 1 MW/cm ² d and a peak wavelength of 400 nm for 3 minutes to obtain a cured liquid crystal hand-written film;

Example 5

The present embodiment provides a polymer liquid crystal composition comprising a polymer having a mass ratio of 50%:50% miscibility and a cholesteric liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

Oligomer monomer: 40 parts of trimethylolpropane trimethacrylate, the molecular formula is:

Photoinitiator: 0.5 parts of 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide, 0.5 parts of 1-hydroxy-cyclohexyl-phenyl ketone;

Oligomer: 20 parts of the 6115 oligomer purchased from Taiwan Changxing Chemical Co., Ltd., the hardness after curing is 70A, the model is DR-U367-1 oligomer 20 parts, the hardness after curing is 25A;

Diluent: 20 parts of 2-phenoxyethyl acrylate having a viscosity of 150 CPS;

Adhesion enhancer: 0.4 parts of tricyclodecane dimethanol dimethacrylate.

(1) Add trimethylolpropane trimethacrylate to the reaction vessel under a yellow light environment, and then sequentially add 6115, DR-U367-1, tricyclodecane dimethanol dimethacrylate at 25 ° C. Ester and 2-phenoxyethyl acrylate, and the resulting mixture is stirred evenly;

(2) adding 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide and 1-hydroxy-cyclohexyl-phenyl ketone, stirring to the 2,4,6,-trimethyl The benzoyl-diphenylphosphine oxide and 1-hydroxy-cyclohexyl-phenyl ketone are completely dissolved in the mixture obtained in the step (1) to obtain a polymer;

(3) mixing and stirring the polymer and the bistable cholesteric liquid crystal at 25 ° C in a dark room until the two are mutually soluble to form a clear mixed liquid;

(4) A spacer powder having a particle diameter of 15 μm is added to the mixed liquid clarified in the step (3), and stirred until the mat powder is uniformly distributed in the mixed liquid to obtain the polymer liquid crystal composition.

Further, the embodiment further provides a liquid crystal handwriting display device, including the aggregation Liquid crystal composition.

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 4 MW/cm ² and a peak wavelength of 400 nm for 5 minutes to obtain a cured liquid crystal hand-written film;

Example 6

The present embodiment provides a polymer liquid crystal composition comprising a polymer having a mass ratio of 30%:70% miscible and a cholesteric liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

Oligomer monomer: 20 parts of lauric acid acrylate, 40 parts of isobornyl methacrylate;

Photoinitiator: 2-hydroxy-cyclohexyl-phenyl ketone 2 parts;

Oligomer: 30 parts of the model 6101 oligomer purchased from Taiwan Changxing Chemical Co., Ltd., the hardness after curing is 80A, the model is DR-U384 oligomer 30 parts, the hardness after curing is 69A;

Diluent: 40 parts of 2-phenoxyethyl acrylate having a viscosity of 180 CPS;

Adhesion enhancer: 0.8 parts of 2-hydroxyethyl methacrylate phosphate.

(1) In a dark room, lauric acid acrylate, isobornyl methacrylate was added to the reaction vessel, and then 6101, DR-U384, 2-hydroxyethyl methacrylate phosphate and then were added at 20 ° C. 2-phenoxyethyl acrylate, and the resulting mixture is stirred evenly;

(1) coating the polymer liquid crystal composition between two sheets of ITO conductive glass by a coating method to obtain a liquid crystal hand-held film semi-finished product;

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 3 MW/cm ² and a peak wavelength of 400 nm for 5 minutes to obtain a cured liquid crystal hand-written film;

Experimental example

1. Test the reflection curve of the liquid crystal handwriting device under different pressure intensities, and the result is shown in FIG. 1. It can be seen from the figure that the reflectance is only when the writing pressure applied to the liquid crystal handwriting device is greater than a certain value. Only when the height is high, the human eye can recognize the trace of writing; this is because when the pressure exceeds a certain value, the arrangement of the liquid crystal changes, so that the writing portion is different from the other portions, and the human eye can recognize and explain the present invention. The liquid crystal handwriting device described above has high pressure sensitivity.

2. Testing the change of the residual image of the liquid crystal handwriting device under different voltages, and the result is shown in FIG. 2. As can be seen from the figure, when the two conductive layers of the liquid crystal handwriting device are energized, the liquid crystal The arrangement is changed again. As the voltage rises, the writing residual image is gradually reduced, and the writing marks are restored to the same color as other places, and the effect of eliminating the writing marks is achieved. As can be seen from the test results, the present invention The liquid crystal handwriting device has a low driving voltage and a small power consumption when the writing marks are clearly written.

Obviously, the above embodiments are merely examples for clarity of explanation, and are not for the embodiments. limited. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations resulting therefrom are still within the scope of the invention.

Claims

A polymer liquid crystal composition comprising a miscible polymer and a liquid crystal, wherein the polymer comprises, by weight, parts by weight of the following components:

30-70 parts of oligomer monomer;

Photoinitiator 0.5-3 parts;

Oligomer 30-70 parts;

Adhesion enhancer 0.1-1 part;

Thinner 5-50 parts.
The polymer liquid crystal composition according to claim 1, wherein the composition comprises the following components in parts by weight:

40-60 parts of oligomer monomer;

Photoinitiator 1-2 parts;

Oligomer 40-60 parts;

Adhesion enhancer 0.4-0.8 parts;

Diluent 20-40 parts.
The polymer liquid crystal composition according to claim 1, wherein the mass ratio of the polymer to the liquid crystal is 15% to 60%: 85% to 40%.
The polymer liquid crystal composition according to claim 3, wherein the oligomer monomer is a monofunctional acrylate monomer, a monofunctional methacrylate monomer, and a bifunctional acrylate monomer. One or more of a difunctional methacrylate monomer, a trifunctional acrylate monomer, and a polyfunctional acrylate monomer having a molecular weight of between 100 and 1000.
The polymer liquid crystal composition according to claim 4, wherein the oligomer is a urethane acrylate oligomer, a polyester acrylate oligomer, a polyether acrylate oligomer, and an unsaturated One or more of the polyester oligomers having a Shore hardness of between 10A and 60D after curing.
The polymer liquid crystal composition according to claim 5, wherein the photoinitiator is 2,4,6,-trimethylbenzoyl-diphenylphosphine oxide, 1-hydroxy-cyclohexyl One or more of phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone; the adhesion enhancer is 2-hydroxyethyl methacrylate phosphate, One or both of tricyclodecane dimethanol dimethacrylate; the diluent being an acrylate monomer having a viscosity of less than 200 CPS.
The polymer liquid crystal composition according to any one of claims 4 to 4, wherein the liquid crystal is a bistable cholesteric liquid crystal.
A method of preparing the polymer liquid crystal composition of claim 1, comprising the steps of:

(1) adding an oligomer monomer to a reaction vessel in a dark room or a yellow light environment, and then sequentially adding an oligomer, an adhesion enhancer and a diluent at room temperature and stirring the obtained mixture uniformly;

(2) adding a photoinitiator, stirring until the photoinitiator is completely dissolved in the mixture obtained in the step (1) to obtain a polymer;

(3) mixing the polymer and the bistable cholesteric liquid crystal at 15-35 ° C in a dark room or a yellow light environment until the two are mutually soluble to form a clear mixture;

(4) adding a spacer powder having a particle diameter of 2 to 20 μm to the mixed liquid clarified in the step (3), stirring until the spacer powder is uniformly distributed in the mixed liquid, thereby obtaining the polymer liquid crystal combination Things.
A liquid crystal handwriting display device comprising a polymer liquid crystal composition comprising a miscible polymer and a liquid crystal, wherein the polymer comprises, in parts by weight, the following components:

30-70 parts of oligomer monomer;

Photoinitiator 0.5-3 parts;

Oligomer 30-70 parts;

Adhesion enhancer 0.1-1 part;

Thinner 5-50 parts.
The liquid crystal handwriting display device according to claim 9, wherein the composition comprises the following components in parts by weight:

40-60 parts of oligomer monomer;

Photoinitiator 1-2 parts;

Oligomer 40-60 parts;

Adhesion enhancer 0.4-0.8 parts;

Diluent 20-40 parts.
The liquid crystal handwriting display device according to claim 9, wherein the mass ratio of the polymer to the liquid crystal is 15% to 60%: 85% to 40%.
The liquid crystal handwriting display device according to claim 11, wherein the oligomer monomer is a monofunctional acrylate monomer, a monofunctional methacrylate monomer, a bifunctional acrylate monomer, One or more of a difunctional methacrylate monomer, a trifunctional acrylate monomer, and a polyfunctional acrylate monomer having a molecular weight of between 100 and 1000.
The liquid crystal handwriting display device according to claim 12, wherein the oligomer monomer is a monofunctional acrylate monomer, a monofunctional methacrylate monomer, a bifunctional acrylate monomer, One or more of a difunctional methacrylate monomer, a trifunctional acrylate monomer, and a polyfunctional acrylate monomer having a molecular weight of between 100 and 1000.
The liquid crystal handwriting display device according to claim 4, wherein the oligomer is a urethane acrylate oligomer, a polyester acrylate oligomer, a polyether acrylate oligomer, and an unsaturated polyester. One or more of the polymers having a Shore hardness of from 10A to 60D after curing.
A method of preparing a liquid crystal handwriting display device according to claim 9, comprising the steps of:

(1) applying the polymer liquid crystal composition between two ITO conductive films or conductive glasses by a roll pressing method or a coating method to obtain a liquid crystal handwritten film semi-finished product;

(2) irradiating the semi-finished product in the step (1) with ultraviolet light having an illuminance of 0.1 to 5 MW/cm 2 and a wavelength of 200 to 400 nm for 1-5 minutes to obtain a cured liquid crystal hand-written film;

(3) The liquid crystal handwriting film is cut into a desired size and assembled and assembled with the driving circuit and the bottom plate casing, that is, the liquid crystal handwriting display device is obtained.