CN106200186B - Liquid crystal handwriting device and manufacturing method thereof - Google Patents
Liquid crystal handwriting device and manufacturing method thereof Download PDFInfo
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- CN106200186B CN106200186B CN201610834779.6A CN201610834779A CN106200186B CN 106200186 B CN106200186 B CN 106200186B CN 201610834779 A CN201610834779 A CN 201610834779A CN 106200186 B CN106200186 B CN 106200186B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
Abstract
The invention provides a liquid crystal handwriting device, which comprises: the liquid crystal display comprises a first substrate, a second substrate, cholesteric liquid crystal, a first layer of polymer and a second layer of polymer; the first substrate and the second substrate are glass or plastic films; the first substrate is a transparent or frosted transparent substrate; the second substrate is a black or transparent substrate. The manufacturing method of the liquid crystal handwriting device comprises the following steps: selecting a base material, preparing cholesteric liquid crystal, mixing a compound, coating a film, irradiating and inspecting. The handwriting generating device can induce pressure to generate handwriting, realizes handwriting function, does not need to be maintained by continuous power supply, does not need to be additionally provided with an additional electric field, can automatically eliminate the handwriting along with time extension, has the characteristics of high contrast, low price and the like, and has huge application space in the fields of training on-site quick memory, enterprises, military private communication and the like.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a liquid crystal handwriting device, in particular to a handwriting device which has high contrast ratio, can write under pressure and can self-eliminate handwriting.
[ background of the invention ]
In the field of liquid crystal display, the liquid crystal display device gradually gets more and more extensive applications based on the handwriting function of the bistable liquid crystal and the energy-saving characteristic of maintaining display without continuous power supply.
The cholesteric liquid crystal material for display is generally prepared from nematic liquid crystal and a chiral agent, has selective reflection on incident light, and for multicolor low-power consumption reflective liquid crystal display, the incident light is reflected only when the optical rotation of the incident light is consistent with that of the cholesteric liquid crystal layer and the wavelength meets a Bragg formula, namely the wavelength lambda of the incident light is in direct proportion to the pitch P and the average refractive index of the liquid crystal material:
the relationship between the pitch P of the cholesteric liquid crystal material and the chiral agent concentration Xc is:
wherein HTP is the twisting force constant of the chiral agent, and the pitch and the reflection wavelength can be changed by adjusting the chiral components and the content of the chiral components in the liquid crystal material of different HTP values.
The reflected light is circularly polarized light, the optical rotation of the reflected light is consistent with that of the cholesteric liquid crystal layer, the light opposite to that of the cholesteric liquid crystal layer penetrates through the liquid crystal layer and enters the next layer, and the light which does not meet the Bragg formula also enters the next layer through the liquid crystal layer. Such a display mode is applied in US2009033811, the state of cholesteric liquid crystal is changed into a planar state under the induction of pressure, and the state satisfies the bragg formula, and the highest reflection intensity is called as a bright state; after a special frequency and a waveform electric field are applied, the cholesteric liquid crystal is converted from a plane state to a focal conic state, a Bragg formula is not satisfied, and incident light is scattered to achieve a dark state. In the display mode, a dark state is achieved by scattering of incident light, and the dark state forms a fog-frosted white color, so that the display contrast is not high.
The traditional handwriting film device must rely on the electric field to drive cholesteric liquid crystal molecules or smectic liquid crystal molecules to adjust the state, such as chinese patent CN103246096, and the electric field is applied through the conductive layer to change smectic a liquid crystal molecules from the parallel electric field direction to the vertical electric field direction. Therefore, when no power-on is applied and the power-on is insufficient, the displayed handwriting cannot be eliminated.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and solve the technical problems that the contrast is low and the handwriting can be eliminated only by using electricity by using a liquid crystal handwriting device capable of automatically eliminating the handwriting.
The object of the invention can be achieved by the following measures:
the liquid crystal handwriting device is characterized in that: the liquid crystal display comprises a first substrate, a second substrate, cholesteric liquid crystals, a first layer of polymer and a second layer of polymer, wherein the first layer of polymer is formed on the first substrate, the second layer of polymer is formed on the surface of the first layer of polymer, the cholesteric liquid crystals are distributed in the second layer of polymer, the second layer of polymer has a vertical orientation effect on liquid crystal molecules of the cholesteric liquid crystals, and the second layer of polymer can stabilize the liquid crystal molecules of the cholesteric liquid crystals in a fingerprint state; when the handwriting pressure acts on the liquid crystal handwriting device, the liquid crystal molecules of the cholesteric liquid crystal are converted into a plane state from a fingerprint state so as to display the writing content; when the handwriting pressure is removed from the liquid crystal handwriting device, the liquid crystal molecules of the cholesteric liquid crystal are slowly converted into a fingerprint state from a plane state under the action of the second layer of polymer, so that self-elimination is realized.
The first substrate and the second substrate are glass or plastic films.
The thickness of the cholesteric liquid crystal and the second layer of polymer is 3-10 micrometers.
The first substrate is a transparent or frosted transparent substrate, and the haze is 0-30%.
The second substrate is a black or transparent substrate.
Furthermore, conductive electrodes are plated on the surfaces of the first substrate and the second substrate, which are close to the bistable liquid crystal and the polymer.
The thickness of the first layer of polymer is 1-3 microns.
Further, the refractive index of the material of the first layer of polymer is matched with the optical refractive index of the material of the cholesteric liquid crystal, and the error between the refractive indexes is less than 0.5.
The content of the cholesteric liquid crystal accounts for 50-90% of the total amount of the liquid crystal and the polymer, and the cholesteric liquid crystal is composed of nematic liquid crystal and a chiral agent.
Further, the content of the chiral agent is adjusted according to the color of the handwriting required to be displayed.
Further, the first layer polymer and the second layer polymer are the same substance or different substances.
In order to achieve the above object, the present invention further provides a method for manufacturing a liquid crystal handwriting device, where the method for manufacturing a liquid crystal handwriting device includes the following steps:
1) selecting a base material: two pieces of transparent PET-Fi lm, ITO (indium tin oxide) with the size of 20cm x 20cm and the surface sheet resistance of 100 ohms;
2) preparing cholesteric liquid crystal: mixing 16.4g TN type liquid crystal SLC100 of Jiangsu synthetic company and 0.62g chiral agent S811 of Jiangsu synthetic company at 80 deg.C, stirring for 2 hr to obtain cholesteric liquid crystal;
3) compound (b): selecting 70% of cholesteric liquid crystal and 30% of JH-002 type polymer of Jiangsu synthesis company to obtain a mixture I; selecting 5g of cholesteric liquid crystal mixture, adding 0.005g of TN-500 microspheres of Equisetum Chiense with the diameter of 5 microns, and stirring at room temperature for 2 hours to obtain a mixture II;
4) film covering: coating the mixture II between two PET-Fi lms by a film laminating machine, wherein an ITO film is close to the mixture II, and the thickness is controlled to be 5 microns;
5) irradiation: after uniform coating, irradiating for 30s under the light intensity of 1mW/cm2, and after finishing irradiation, irradiating for 5min under the light intensity of 7mW/cm2 to form a first layer polymer and a second layer polymer;
6) and (4) checking: when writing is started, because of the ITO electrode, the self-disappearing time is 1min, and on the other hand, the instant disappearing can be realized by applying an alternating current of 40V and 50Hz to the outside.
Compared with the prior art, the invention has the following advantages:
can the induced pressure produce the handwriting, realize the handwriting function, this handwriting need not to last the power supply and maintain, and need not plus extra electric field handwriting can prolong automatic elimination along with time, possess characteristics such as high contrast, low price, and have huge application space in fields such as training field flash memory, enterprise and military ization private communication, possess high contrast, can the induced pressure produce the handwriting, realize the handwriting function, this handwriting need not to last the power supply and maintains, and need not to apply extra electric field handwriting and can prolong automatic elimination along with time.
[ description of the drawings ]
FIG. 1 is a schematic illustration of a cross-section of the present invention;
FIG. 2 is a schematic diagram of the focal conic state of cholesteric liquid crystals of the invention;
FIG. 3 is a schematic diagram of a planar state of cholesteric liquid crystal according to the present invention;
FIG. 4 is a schematic representation of the fingerprint state of cholesteric liquid crystals of the invention;
FIG. 5 is a flow chart of a manufacturing method of the present invention.
[ detailed description ] embodiments
Referring now to the drawings, the present invention will be described in detail with reference to the following embodiments:
referring to fig. 3, the liquid crystal handwriting device is composed of a first substrate 11, a second substrate 12, cholesteric liquid crystals 13, a first layer of polymer 14 and a second layer of polymer 15.
The first substrate 11 and the second substrate 12 are glass or plastic films.
The thickness of the cholesteric liquid crystal 13 and the second layer of polymer 15 is 3-10 micrometers.
The first substrate 11 is a transparent or frosted transparent substrate with haze of 0-30%.
The second substrate 12 is a black or transparent substrate.
Further, the surfaces of the first substrate 11 and the second substrate 12 close to the bistable liquid crystal and the polymer may be plated with conductive electrodes, which may be manually erased by an external electric field or automatically erased by time extension.
The thickness of the first layer of polymer 14 is 1-3 microns.
Further, the refractive index of the material of the first layer polymer 14 is matched with the optical refractive index of the material of the cholesteric liquid crystal 13, and the error between the refractive indexes is less than 0.5.
The content of the cholesteric liquid crystal 13 accounts for 50-90% of the total liquid crystal and polymer mixture, and the cholesteric liquid crystal is composed of nematic liquid crystal and a chiral agent.
Further, the content of the chiral agent is adjusted according to the color of the handwriting required to be displayed.
Further, the first layer polymer 14 and the second layer polymer 15 are the same substance or different substances, and may be acrylate glue, and are cured by ultraviolet light; or epoxy glue which is solidified by normal temperature or heating.
The cholesteric liquid crystal 13 and the prepolymer monomer are sufficiently stirred at room temperature to form a mixture, uniformly sandwiched between the first substrate 11 and the second substrate 12 by roll-to-roll coating, and the overall thickness is controlled by commercial spacer beads or a photo-polymerized gap controller. After uniform coating, a first layer of polymer 14 is formed by a first step of low UV intensity prepolymerization, and then a second layer of polymer 15 is formed by a second step of high UV intensity complete polymerization.
Another mechanism for generating the first layer of polymer 14 may be to coat a layer of polymer monomer on the first substrate 11 in advance, and cure the polymer monomer under heat or UV. Then, a mixed solution of cholesteric liquid crystal 13 and a pre-polymer is coated between the two substrates, and a second layer of polymer 15 is formed by performing a step of increasing UV light intensity.
During writing, the liquid crystal molecules are transformed from the initial fingerprint state to the planar state, the fingerprint state is shown in fig. 4, and the planar state is shown in fig. 3. Pure liquid crystal molecules have high energy in the fingerprint state and slowly change into a focal conic state, which is shown in fig. 2 and needs a special structure to be stable.
The monomer prepolymer is added into the liquid crystal, and the second layer of polymer 15 is formed under the action of the first layer of polymer 14 on the surface in the polymerization process of the monomer prepolymer, so that the liquid crystal molecules are vertically oriented, and the fingerprint state of the liquid crystal molecules can be stabilized. Therefore, the fingerprint state is changed into the displayable plane state when the liquid crystal handwriting device writes in, and in addition, the plane state can be slowly changed into the fingerprint state under the action of the second layer polymer 15, so that the characteristic of self elimination without an external electric field is realized. Wherein the transition time is adjusted according to the content of the second layer polymer 15 and the molecular chain structure.
Referring to fig. 4, the method for manufacturing the liquid crystal handwriting device includes the following steps:
1) selecting a base material: two pieces of transparent PET-Film, 20cm by 20cm in size, with 100 ohm resistance of ITO (indium tin oxide) on the surface;
2) preparing cholesteric liquid crystal: mixing 16.4g TN type liquid crystal SLC100 of Jiangsu synthetic company and 0.62g chiral agent S811 of Jiangsu synthetic company at 80 deg.C, stirring for 2 hr to obtain cholesteric liquid crystal;
3) preparing a mixture: selecting 70% of cholesteric liquid crystal and 30% of JH-002 type polymer of Jiangsu synthesis company to obtain a mixture I; selecting 5g of cholesteric liquid crystal mixture, adding 0.005g of TN-500 microspheres of Equisetum Chiense with the diameter of 5 microns, and stirring at room temperature for 2 hours to obtain a mixture II:
4) film covering: coating the mixture II between two PET-films by a Film laminating machine, wherein the ITO Film is close to the mixture II, and the thickness is controlled to be 5 microns;
5) irradiation heating: after uniform coating, irradiating for 30s under the light intensity of 1mW/cm2, and after finishing irradiation, irradiating for 5min under the light intensity of 7mW/cm2 to form a first layer polymer and a second layer polymer;
6) and (4) checking: writing is started, and because of the ITO electrode, the self-disappearing writing ink can disappear for 1min on one hand; on one hand, the electric field of 40V and 50Hz alternating current can be applied externally to realize instant disappearance.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (12)
1. A liquid crystal handwriting device is characterized in that: the liquid crystal display comprises a first substrate, a second substrate, cholesteric liquid crystals, a first layer of polymer and a second layer of polymer, wherein the first layer of polymer is formed on the first substrate, the second layer of polymer is formed on the surface of the first layer of polymer, the cholesteric liquid crystals are distributed in the second layer of polymer, the second layer of polymer has a vertical orientation effect on liquid crystal molecules of the cholesteric liquid crystals, and the second layer of polymer can stabilize the liquid crystal molecules of the cholesteric liquid crystals in a fingerprint state; when the handwriting pressure acts on the liquid crystal handwriting device, the liquid crystal molecules of the cholesteric liquid crystal are converted into a plane state from a fingerprint state so as to display the writing content; when the handwriting pressure is removed from the liquid crystal handwriting device, the liquid crystal molecules of the cholesteric liquid crystal are slowly converted into a fingerprint state from a plane state under the action of the second layer of polymer, so that self-elimination is realized.
2. The liquid crystal handwriting apparatus of claim 1, characterized in that: the first substrate and the second substrate are glass or plastic films.
3. The liquid crystal handwriting apparatus of claim 1, characterized in that: the total thickness of the cholesteric liquid crystal and the second layer of polymer is 3-10 micrometers.
4. The liquid crystal handwriting apparatus of claim 2, characterized in that: the first substrate is a transparent or frosted transparent substrate, and the haze is 0-30%.
5. The liquid crystal handwriting apparatus of claim 2, characterized in that: the second substrate is a black or transparent substrate.
6. The liquid crystal handwriting apparatus of claim 1, characterized in that: and conductive electrodes are plated on the surfaces of the first substrate and the second substrate, which are close to the cholesteric liquid crystal and the first layer of polymer.
7. The liquid crystal handwriting apparatus of claim 1, characterized in that: the thickness of the first layer of polymer is 1-3 microns.
8. The liquid crystal handwriting apparatus of claim 1, characterized in that: the material optical refractive index of the first layer of polymer is matched with that of the cholesteric liquid crystal, and the error between the material optical refractive index of the first layer of polymer and that of the cholesteric liquid crystal is less than 0.5.
9. The liquid crystal handwriting apparatus of claim 1, characterized in that: the content of the cholesteric liquid crystal accounts for 50-90% of the total amount of the cholesteric liquid crystal, the first layer of polymer and the second layer of polymer, and the cholesteric liquid crystal is composed of nematic liquid crystal and a chiral agent.
10. The liquid crystal handwriting apparatus of claim 9, characterized in that: the content of the chiral agent is adjusted according to the color of the handwriting to be displayed.
11. The liquid crystal handwriting apparatus of claim 1, characterized in that: the first layer of polymer and the second layer of polymer are the same or different substances, and are formed by ultraviolet curing of acrylate glue or curing of epoxy glue at normal temperature or heating.
12. A method for manufacturing a liquid crystal handwriting device according to claims 1-11, characterized in that:
1) selecting a base material: two pieces of transparent PET-Film, 20cm by 20cm in size, with 100 ohm resistance of ITO (indium tin oxide) on the surface;
2) preparing cholesteric liquid crystal: mixing 16.4g TN type liquid crystal SLC100 of Jiangsu synthetic company and 0.62g chiral agent S811 of Jiangsu synthetic company at 80 deg.C, stirring for 2 hr to obtain cholesteric liquid crystal;
3) compound (b): selecting 70% of cholesteric liquid crystal and 30% of JH-002 type polymer of Jiangsu synthesis company to obtain a mixture I; selecting 5g of cholesteric liquid crystal mixture, adding 0.005g of TN-500 microspheres of Equisetum Chiense with the diameter of 5 microns, and stirring at room temperature for 2 hours to obtain a mixture II;
4) film covering: coating the mixture II between two PET-films by a Film laminating machine, wherein the ITO Film is close to the mixture II, and the thickness is controlled to be 5 microns;
5) irradiation: after uniform coating, irradiating for 30s under the light intensity of 1mW/cm2, and after finishing irradiation, irradiating for 5min under the light intensity of 7mW/cm2 to form a first layer polymer and a second layer polymer;
6) and (4) checking: writing is started, and because of the ITO electrode, the self-disappearing writing ink can disappear for 1min on one hand;
on the other hand, the electric field of 40V and 50Hz alternating current can be applied externally to realize instant disappearance.
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| CN109280515B (en) * | 2018-09-03 | 2020-05-22 | 刘旭 | Liquid crystal pressure-sensitive film with high contrast |
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