CN114063335A - Preparation method of trans-polymer honeycomb-net liquid crystal display and display panel - Google Patents
Preparation method of trans-polymer honeycomb-net liquid crystal display and display panel Download PDFInfo
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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Abstract
The invention provides a preparation method of a trans-polymer honeycomb-net liquid crystal display and a display panel, wherein the preparation method comprises the following steps: introducing a polymer into the negative nematic liquid crystal, and uniformly mixing to obtain a mixed system, wherein the mass of the polymer accounts for 15-30% of the mass of the mixed system and does not contain 15% and 30%; pouring the mixed system into a non-pretilt-angle liquid crystal box made of a glass substrate plated with a conductive layer; and (3) exposing the non-pretilt-angle liquid crystal box filled with the mixed system in a point light source mode by using ultraviolet light incident in vertical plane collimation to prepare the trans-polymer honeycomb network liquid crystal display. Through the vertical incidence collimation ultraviolet ray, the polymer silk chain network polymerized by the vertical plane plays a role in enabling the liquid crystal to be arranged and oriented vertically, so that the liquid crystal has higher light transmittance in zero electric field, and the effect of enhancing scattering of a thin layer after the electric field is applied can be achieved.
Description
Technical Field
The invention relates to the technical field of liquid crystal application, in particular to a preparation method of a trans-polymer honeycomb-mesh liquid crystal display and a display panel.
Background
The composite film of polymer and liquid crystal is a special photoelectric film with two display effects. In recent years, interest has been generated among many researchers and manufacturers. The existing composite systems can be classified into Polymer Dispersed Liquid Crystal (PDLC) and Polymer Network Liquid Crystal (PNLC). Wherein the mass of the polymer in the PDLC accounts for more than 30% of the mass of the composite system; the mass of the polymer in the PNLC accounts for less than 15% of the mass of the composite system. PDLC is a dispersion of liquid crystals in small droplets of the order of microns in an organic solid polymer matrix, while PNLC is a polymer forming a network of silk chains distributed in the liquid crystal layer in discrete states. Extensive and intensive research and application have been conducted on PDLC and PNLC, and thus, a great deal of research and application on PDLC and PNLC has been disclosed. The PDLC film and the PHLC film present different state transition, namely the transition between the scattering fog state and the transparent state according to different electric field states, and form a distinctive display by contrast of the two states. The two films do not need polaroids or orientation layers, are high in speed, simple in manufacturing process and energy-saving lamp, and have certain application and development values.
However, in the polymer and liquid crystal composite system of the trans-PDLC, the adhesive force of the large-area flexible device composite film is stronger due to the higher content of the polymer, but the driving voltage influencing the device is higher; on the contrary, because the polymer content in the polymer and liquid crystal composite system of the trans-PNLC is lower, the driving voltage of the display device will be lower, but the polymer network cannot bond the upper and lower substrates, and polymer micro-walls are required to be manufactured to bond the upper and lower substrates, so that the PNLC technology is not favorable for manufacturing large-area flexible display devices. And because the polymer content in the PNLC is very low, if a stronger scattering effect is obtained, the liquid crystal box needs to be thicker, which brings the problem of higher driving voltage. In the prior art, a polymer matrix of electric field induced homeotropic orientation polymerization is prepared by using positive liquid crystal, then the positive liquid crystal is dissolved and removed, and the negative liquid crystal is poured again. In conclusion, in the preparation process of the existing trans-PDLC or PNLC product, the contrast is not high, the driving voltage is higher, and the effect is not satisfactory.
In addition, in the process of preparing the PDLC or PNLC product, the conventional large-area surface light source is generally adopted to carry out ultraviolet exposure phase separation. However, some linear monomers have the property of being polymer-prone along the direction of propagation of the beam. The large-area surface light source has no fixed light beam direction propagation direction, so that the light beam propagation direction has anisotropy. Therefore, after the ultraviolet light plane light source exposes the mixed system of the polymer and the negative nematic liquid crystal, the formed polymer silk chains are in a three-dimensional scattered distribution state. Thus, the polarization-induced directional polymerization characteristics of certain photopolymerizable monomers are masked. However, the polymer filament chains in a scattered distribution state cause low light transmittance at zero electric field, thereby affecting the final display effect. While other prior art techniques reduce the polymer content in order to achieve a transparent state with high transmittance. This results in thin cells with insufficient scattering and poor contrast. Even if the thickness of the liquid crystal cell is increased, thereby increasing the contrast. But this in turn results in a relatively high drive voltage.
In view of the above, there is a need to improve the composite system of polymer and liquid crystal in the prior art to solve the above problems.
Disclosure of Invention
The invention aims to provide a preparation method of a trans-polymer honeycomb-network liquid crystal display and a display panel, which are used for solving the problem that the prior art cannot realize the compatibility of high light transmittance, low driving voltage and strong scattering effect.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, a method for preparing a trans-polymer honeycomb-network liquid crystal display is provided, which comprises the following steps:
introducing a polymer into the negative nematic liquid crystal, and uniformly mixing to obtain a mixed system, wherein the mass of the polymer accounts for 15-30% of the mass of the mixed system and does not contain 15% and 30%;
pouring the mixed system into a non-pretilt-angle liquid crystal box made of a glass substrate plated with a conductive layer;
and (3) exposing the liquid crystal box filled with the mixed system and without a pretilt angle in a point light source mode by using ultraviolet light incident in a vertical plane collimation manner to prepare the trans-polymer honeycomb network liquid crystal display.
As a further improvement of the invention, the polymer is obtained by incorporating a photoinitiator in the monomer of the prepolymer.
As a further improvement of the invention, the mass of the photoinitiator represents 1% of the mass of the polymer.
As a further improvement of the present invention, the pre-polymer monomer refers to a photo-polymerizable monomer which is easily polymerized along the propagation direction of the light beam.
As a further improvement of the invention, after the ultraviolet light which is collimated and incident by the vertical plane is exposed in a point light source mode, the polymer honeycomb pore channel network which is uniformly distributed in one dimension along the normal direction in the liquid crystal box without the pretilt angle is formed.
As a further improvement of the invention, after the negative nematic liquid crystal is exposed in a point light source mode through ultraviolet light which is collimated and incident by the vertical plane, the surface of the liquid crystal box without the pretilt angle is formed to be in a one-dimensional vertical arrangement distribution state along the normal direction of the liquid crystal box without the pretilt angle.
In a second aspect, there is provided a display panel,
the display panel is prepared on the basis of the preparation method of the trans-polymer honeycomb-network liquid crystal display.
As a further improvement of the present invention, the display substrate is in a transparent state at zero electric field and in a scattering fog state at applied electric field.
As a further improvement of the present invention, the transparent state means that the negative nematic liquid crystal is in a one-dimensional vertical arrangement distribution state on the surface of the liquid crystal cell without pretilt angle along the normal direction of the liquid crystal cell without pretilt angle;
the scattering state refers to the distribution state of the negative nematic liquid crystal parallel to the liquid crystal box without pretilt angle along the direction of a vertical electric field on the surface of the liquid crystal box without pretilt angle.
Drawings
Fig. 1 is a flow chart of a method of manufacturing a trans-polymer liquid crystal display according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a transparent-before-power-up trans-PHLC principle provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of the principle of a trans-PHLC for scattering mist state after power-up according to an embodiment of the present invention;
fig. 4 is a schematic view of an ultraviolet exposure apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a schematic diagram of a display panel prepared by a method for preparing a liquid crystal display based on a reverse polymer cellular network according to an embodiment of the present invention before power-up;
fig. 6 is a schematic diagram of a display panel obtained by a manufacturing method of a trans-polymer-based liquid crystal display based on a cellular network according to an embodiment of the present invention after power-up;
fig. 7 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In particular, in various embodiments of the present invention, the term "vertical plane" refers to a plane perpendicular to the upper glass substrate 111 and the lower glass substrate 112. The term "upright" refers to a vertical state of negative nematic liquid crystal, with one end directed toward the upper glass substrate 111 and one end directed toward the lower glass substrate 112. The term "pair of cells" means that the upper glass substrate 111 and the lower glass substrate 112 are aligned in both the horizontal direction and the vertical direction. The term "sandwiched" refers to being located at a position intermediate the upper glass substrate 111 and the lower glass substrate 112.
The invention provides a preparation method of a trans-polymer honeycomb-net liquid crystal display and a display panel, aiming at the problem that the prior art can not realize the consideration of high light transmittance, low driving voltage and strong scattering effect.
The first embodiment is as follows:
referring to fig. 1, fig. 1 is a flowchart of a method for manufacturing a trans-polymer liquid crystal display with a cellular network according to an embodiment of the present invention. The method comprises steps 11 to 13. And 11, introducing a polymer into the negative nematic liquid crystal, and uniformly mixing to obtain a mixed system, wherein the mass of the polymer accounts for 15-30% of the mass of the mixed system and does not contain 15% and 30%. Further, the mass of the selected polymer may be in a preferable range of 20% to 25% of the mass of the mixed system, and more preferably the mass of the polymer is 22% of the mass of the mixed system. And step 12, pouring the mixed system into a liquid crystal box without a pretilt angle, wherein the liquid crystal box is made of a glass substrate plated with a conductive layer. And step 13, exposing the liquid crystal box filled with the mixed system and without a pretilt angle in a point light source mode by using ultraviolet light incident in vertical plane collimation to prepare the trans-polymer honeycomb network liquid crystal display.
By liquid crystal, it is meant that, in a molten state or dissolved by a solvent, some material, although losing the rigidity of the solid material, acquires the liquid mobility and retains the anisotropic ordering of the molecules of the partially crystalline material, forming an intermediate state with some of the properties of both the crystal and the liquid, an oriented fluid existing during the transition from the solid state to the liquid state. The negative nematic liquid crystal in the present invention refers to a negative dielectric anisotropy small molecule liquid crystal. The polymer is prepared by introducing a photoinitiator into a prepolymer monomer. Wherein the mass of the photoinitiator accounts for 1% of the mass of the polymer. Prepolymer monomers refer to small molecules of synthetic polymers, such as those made from CH2＝CH2It can be polymerized into Polyethylene (PE), wherein the polyethylene is a polymer and the monomer is ethylene. The photoinitiator is a substance which generates radicals after being irradiated with light and further initiates polymerization.
Specifically, in this embodiment, the negative nematic liquid crystal is produced by the product GIVE-7919-270 (n) from Nicotiana Kogyoo＝1.5，ne＝1.77，△n is 0.27). The prepolymer monomer is prepared from the Changxing chemical product EM211 ethoxy ethyl acrylate (EOEOEA, n is 1.436). The photoinitiator was 1173 (2-hydroxy-2-methyl-1-phenyl-1-propanone, abbreviated as HMPP). First, a photoinitiator is introduced into a prepolymer monomer to prepare a polymer. Then, a polymer is introduced into the negative nematic liquid crystal and uniformly mixed to obtain a mixed system. And then, pouring the mixed system into a liquid crystal box without a pretilt angle, which is manufactured by a glass substrate plated with a conductive layer. And finally, exposing the non-pretilt-angle liquid crystal box filled with the mixed system in a point light source mode by using ultraviolet light incident in vertical plane collimation, wherein the exposure time is 2min, and thus the trans-polymer honeycomb network liquid crystal display is prepared. Wherein the mass of the prepolymer monomer accounts for 99% of the mass of the polymer, the mass of the photoinitiator accounts for 1% of the mass of the polymer, the mass of the negative nematic liquid crystal accounts for 80% of the mass of the mixed system, and the mass of the polymer accounts for 20% of the mass of the mixed system.
Please refer to fig. 2, which illustrates a transparent trans-PHLC principle before power-up according to an embodiment of the present invention, and fig. 3, which illustrates a scattering fog-state trans-PHLC principle after power-up according to an embodiment of the present invention. As shown in fig. 2, the schematic diagram includes: the polymer honeycomb network 100 is uniformly distributed in one dimension before power up, and the liquid crystal 200 is vertically arranged and distributed in one dimension before power up. As shown in fig. 3, the schematic diagram includes: the polymer honeycomb network of channels 100 is uniformly distributed in one dimension after power up, and the liquid crystal 300 is distributed in parallel to the liquid crystal cell without pretilt angle after power up. A trans-polymer honeycomb-net liquid crystal display is prepared according to the preparation method of the trans-polymer honeycomb-net liquid crystal display. The transparent conductive film is in two different states before and after electrification, and is in a transparent state before electrification and in a scattering fog state after electrification. Therefore, the transparent state and the scattering fog state form a relatively obvious contrast to form a display effect.
In one aspect, the polymerizable monomer of the present invention is a photopolymerizable monomer that is easily polymerizable along the propagation direction of the light beam. Through several experiments, it is found that some linear monomers have the characteristic of being easy to polymerize along the vertical light beam propagation direction, and optically, if the light beam propagation direction is taken as the z axis and the vertical light beam propagation direction is taken as the x and y axes, some monomers are easy to polymerize along the z direction of the light beam propagation direction, and other monomers tend to polymerize along the x and y directions of the vertical light beam propagation direction. The invention utilizes the characteristic of the photopolymerizable monomer, so that the photopolymerizable monomer which is easy to polymerize along the propagation direction of light beams can form a polymer honeycomb pore canal network which is uniformly distributed along the normal direction in the liquid crystal box without a pretilt angle when vertical incident ultraviolet rays are used for exposure. The effect of such a structure is that the polymer network acts as a homeotropic alignment agent, constraining the homeotropic alignment of the liquid crystal molecules, so that the liquid crystal cell is in a transparent state when no electric field is applied, i.e. when there is no electric field. On the other hand, the liquid crystal of the present invention employs a negative nematic liquid crystal. Although the photopolymerizable monomers are readily polymerizable in the normal direction in a non-pretilt cell, a small amount of the polymer network still remains in the non-pretilt cell in other directions than normal. The structure enables the negative nematic liquid crystal to be aligned along the direction of a vertical electric field on the surface of the liquid crystal box without a pretilt angle when the liquid crystal box is subjected to a time electric field, and a small amount of polymer network is arranged at the interface of the negative liquid crystal. Thereby enhancing the effect of scattering. The mixed system is poured into a liquid crystal box without a pretilt angle, and the content of the polymer in the mixed system is lower. Therefore, the liquid crystal cell without pretilt angle can be poured into the liquid crystal cell according to the conventional process. In this regard, the method of filling the mixed system into the non-pretilt liquid crystal cell is not limited in this embodiment. In addition, the liquid crystal cell of the present invention is a liquid crystal cell without pretilt angle, and it is well known that the pretilt angle can control the orientation of the surface molecules, and the pretilt angle also causes the voltage variation. Therefore, to avoid the effect of the pretilt angle on the homogeneous mixture in the cell, a cell without pretilt angle is used to inject the mixed system. Finally, it is well known that the mixed system of polymer and liquid crystal is divided into two kinds, PDLC and PHLC, respectively. Wherein the mass of the polymer in the PDLC accounts for 30% or more of the mass of the mixed system, and the mass of the polymer in the PHLC accounts for 15% or less of the mass of the mixed system. PDLC is a dispersion of liquid crystals in small droplets of the order of microns in an organic solid polymer matrix, while PNLC is a polymer forming a network of silk chains distributed in the liquid crystal layer in discrete states. However, in the polymer and liquid crystal composite system of the trans-PDLC, the adhesive force of the large-area flexible device composite film is stronger due to the higher content of the polymer, but the driving voltage influencing the device is higher; on the contrary, because the polymer content in the polymer and liquid crystal composite system of the PNLC is lower, the driving voltage of the display device will be lower, but the polymer network does not function to bond the upper and lower substrates, and polymer micro-walls are required to be manufactured to bond the upper and lower substrates, so that the PNLC technology is not favorable for manufacturing large-area flexible display devices. And because the polymer content in the PNLC is very low, if a stronger scattering effect is obtained, the liquid crystal box needs to be thicker, which brings the problem of higher driving voltage. The mass of the polymer in the invention accounts for 15-30% of the mass of the mixed system, and 15-30% is not included. Such amounts of the mixed system form neither a polymer matrix in which the liquid crystals are dispersed nor a discretely interwoven network, but rather a sufficiently dense network or even interconnected cell microcavities. As an ideal model, for example, it is assumed that a structure similar to a honeycomb network, referred to as a honeycomb network, is formed, and then this new composite system of polymer and Liquid Crystal is referred to as "Polymer Honeycomb Liquid Crystal (PHLC)".
Example two:
a method for ultraviolet exposure of a trans-polymer liquid crystal display with a cellular network, please refer to the schematic diagram of the ultraviolet exposure apparatus shown in fig. 4. The schematic diagram includes: the schematic diagram includes: an upper ultraviolet light area source 411, a lower ultraviolet light area source 412, an upper collimating aperture array 421, a lower collimating aperture array 422, and a product (a pretilt angle-free liquid crystal cell filled in a mixed system) 400.
Specifically, referring to fig. 4, both sides of the non-pretilt liquid crystal cell 400 injected into the hybrid system are exposed simultaneously using an upper uv light source 411 and a lower uv light source 412. Meanwhile, an upper collimating diaphragm array 421 is arranged between the non-pretilt-angle liquid crystal box 400 injected with the mixed system and the upper ultraviolet light surface light source 411, and a lower collimating diaphragm array 422 is arranged between the non-pretilt-angle liquid crystal box 400 injected with the mixed system and the lower ultraviolet light surface light source 412. The upper collimating aperture array 421 and the lower collimating aperture array 422 are used to convert the ultraviolet light area source into an ultraviolet light point source. Therefore, the polymer honeycomb-net liquid crystal display is prepared by using vertical plane incident collimation ultraviolet light to expose the liquid crystal box without the pretilt angle injected into the mixed system.
It should be noted that the existing trans-PDLC or PNLC uses an ultraviolet light source to perform the exposure phase separation, and the trans-PHLC of the present invention uses the exposure phase separation of converting the ultraviolet light source into the ultraviolet light source. It has been found that certain linear monomers have the property of being readily polymerizable along a direction perpendicular to the direction of propagation of the light beam. Optically, if the direction of beam propagation is taken as the z-axis and the perpendicular direction of beam propagation is taken as the x-axis and the y-axis, then there is some monomer polymerization along the z-direction of beam propagation. In addition, some monomers tend to polymerize in the x, y direction perpendicular to the direction of beam propagation. Indeed, photopolymerizable monomers are a very large family of organic molecules, which is not available in most single-tube or multi-functional linear monomers. However, such monomers are still easily found experimentally. By adopting simple experiments, the polymer dispersed liquid crystal film with lower polymer content and single linear monomer component is prepared by vertical incidence exposure of collimated ultraviolet light. It will be seen that some linear monomers produce trans-PDLC with little haze and relatively transparency, indicating that the linear monomers form a polymer which is easily polymerized along the z-direction of the propagation of the light beam; similarly, the trans-PDLC has a very large haze and is very scattering, which indicates that the polymer with easy polymerization directions along the directions x and y perpendicular to the propagation direction of the light beam is formed after the linear monomer is polymerized. From the view point of molecular physics, organic molecules have pi electron cloud or sigma electron cloud, and can be stably or concussively influenced or not influenced by the disturbance of polarized light, so that the organic molecules are polymerized or not polymerized, and then the photo-induced directional polymerization reaction is generated. The polyfunctional monomer or oligomer is easily polymerized into a multi-branched polymer. Generally, large-area ultraviolet light area sources are used in experiments or production, the propagation direction of light beams has anisotropy, and the prepared samples are certainly three-dimensionally and randomly distributed polymer silk chains, so that the characteristic of polarization-induced directional polymerization of certain photopolymerizable monomers is covered. Therefore, the photopolymerisable monomer which is easy to polymerize along the vertical light beam propagation direction adopts negative nematic liquid crystal, and the mixed system of the polymer and the liquid crystal is exposed by using vertical incidence collimation ultraviolet rays. Although the direction perpendicular to the surface of the liquid crystal cell is a direction in which polymerization is easy, a small amount of polymer network is also in other directions, so that when an electric field is applied to the liquid crystal cell, the negative liquid crystal molecules are oriented in the direction of the perpendicular electric field, and the scattering effect is enhanced by the interface of the small amount of polymer network and the negative liquid crystal. Therefore, a stronger fog state scattering effect of a thinner liquid crystal box can be realized, and the driving voltage of the thin liquid crystal box is naturally lower. However, the direction of the polymer filament chain formed by the incidence of the surface light source in the prior art has anisotropy, and it is needless to say that the liquid crystal molecules in the initial state without the electric field can not be in the homeotropic alignment state. Compared with the prior art, the trans-polymer honeycomb-net liquid crystal display can achieve the function of vertical orientation of liquid crystal molecules through the polymer silk chain network polymerized in a vertical plane. The polymer silk chain network has higher density and is inclined to be arranged in a vertical plane, the polymer network with certain concentration can not only achieve the function of a vertical plane orientation agent so as to have higher light transmittance in zero electric field, but also achieve the effect that the film layer enhances scattering after the electric field is applied. According to the technical scheme, the fog state scattering is enhanced, and further through optimization and adjustment, the high light transmittance of the transparent state of the trans-PDLC or PNLC display can be achieved, the driving voltage of the fog state is low, the scattering is strong enough, and the transparent state and the fog state can form a large contrast, so that the display effect is enhanced.
Example three:
please refer to a schematic diagram of a display panel prepared by the preparation method of the liquid crystal display based on the trans-polymer cellular network shown in fig. 5 before power-up and a schematic diagram of a display panel prepared by the preparation method of the liquid crystal display based on the trans-polymer cellular network shown in fig. 6 after power-up. Indium Tin Oxide (ITO), illustratively, is a mixture of transparent brown film or yellow patch gray, the primary property being its combination of electrical conductivity and optical transparency. Therefore, the method is used for preparing devices such as liquid crystal display panels, flat panel display panels and the like. As shown in fig. 5, the schematic diagram includes: the liquid crystal display comprises an upper glass substrate 111, a lower glass substrate 112, an upper ITO conductive layer 121, a lower ITO conductive layer 122, a polymer honeycomb pore network 100 which is uniformly distributed in one dimension before electrification, a liquid crystal 501 which is vertically arranged and distributed in one dimension before electrification and a polymer honeycomb network liquid crystal 500 before electrification. As shown in fig. 6, the schematic diagram includes: the liquid crystal display panel comprises an upper glass substrate 111, a lower glass substrate 112, an upper ITO conductive layer 121, a lower ITO conductive layer 122, a polymer honeycomb pore network 100 which is uniformly distributed in one dimension after being electrified, a liquid crystal 601 which is parallel to the distribution state of the liquid crystal box without the pretilt angle after being electrified, and a polymer honeycomb network liquid crystal 600 after being electrified.
Specifically, a display panel includes: an upper glass substrate 111, a lower glass substrate 112, an upper ITO conductive layer 121, a lower ITO conductive layer 122, and a trans-polymer liquid crystal cell (trans-polymer liquid crystal cell 500 before energization or trans-polymer liquid crystal cell 600 after energization). The upper glass substrate 111 and the lower glass substrate 112 are arranged in pairs, an upper ITO conductive layer 121 is arranged below the upper glass substrate 111 in a transition mode, a lower ITO conductive layer 122 is arranged above the lower glass substrate 112 in a transition mode, and then trans-polymer cellular liquid crystal is clamped between the upper ITO conductive layer 121 and the lower ITO conductive layer 122. The display panel is transparent in a zero electric field and is in a scattering fog state when an electric field is applied. Referring to fig. 5, the polymer honeycomb network 100 is uniformly distributed in one dimension before power-on, the liquid crystal 501 is vertically arranged and distributed in one dimension before power-on, and the polymer honeycomb liquid crystal 500 is arranged before power-on. Referring to fig. 6, after power up, the polymer honeycomb cell network 100 exhibits a one-dimensional uniform distribution after power up, and after power up, the liquid crystal 601 exhibits a distribution state parallel to the non-pretilt liquid crystal cell. Therefore, both the scattering haze state and the transparent state form a clear contrast, thereby constituting the display panel.
Example four:
referring to fig. 7, fig. 7 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention. The method comprises at least steps 71 to 74. And step 71, preparing a liquid crystal box without pretilt angles. Step 72 prepares a polymer. Step 73, a mixed system of polymer and negative nematic liquid crystal is prepared. And step 74, injecting the mixed system into a non-pretilt-angle liquid crystal box, and performing ultraviolet exposure on the non-pretilt-angle liquid crystal box into which the mixed system is injected to prepare the display panel.
Specifically, in this embodiment, the non-pretilt liquid crystal cell etched with the character patterns is fabricated according to a simplified conventional process for fabricating the TN liquid crystal display panel, wherein the size of the non-pretilt liquid crystal cell is 6 × 4cm2The cell gap is 10 μm, and the thickness of the ITO glass is 0.7 mm. Then, preparing a polymer, and introducing a photoinitiator into a prepolymer monomer, wherein the mass of the photoinitiator accounts for 1% of the mass of the polymer. Wherein, the prepolymer monomer is the Changxing chemical product EM211 ethoxy ethyl acrylate (EOEOEA, n is 1.436), and the photoinitiator is 1173 (2-hydroxy-2-methyl-1-phenyl-1-acetone, HMPP for short). Then, a mixed system of negative nematic liquid crystal and polymer is prepared, wherein the mass of the polymer accounts for 20% of the mass of the mixed system, and the mass of the negative nematic liquid crystal accounts for 80% of the mass of the mixed system. Wherein the negative nematic liquid crystal is selected from GIVE-7919-270 (n) from Nicotiana Kogyoo＝1.5，ne1.77 and Δ n 0.27). And finally, injecting the mixed system into a non-pretilt-angle liquid crystal box, and exposing the non-pretilt-angle liquid crystal box injected with the mixed system by using ultraviolet light incident in a vertical plane collimation manner to form an exposure with a point light source, wherein the exposure time is 2min, and the exposure intensity is 0.2W/cm2. The photopolymerisable monomers with the vertical light beam propagation direction being the easy polymerization direction form a polymer honeycomb pore channel network which is uniformly distributed in one dimension along the normal direction in the liquid crystal box without a pretilt angle; the surface of the liquid crystal box without the pretilt angle formed by the negative nematic liquid crystal presents a one-dimensional vertical arrangement distribution state along the normal direction of the liquid crystal box without the pretilt angle. Thus, a trans-polymer bee net is preparedA liquid crystal display panel. The display panel prepared by the steps is a transparent glass sheet (or film) in appearance, and presents a scattering fog state when an electric field is applied. According to the conversion of the two states, thereby, characters and figures are displayed.
It should be noted that the method for preparing the liquid crystal empty cell without the pretilt angle may be a TN liquid crystal display preparation method in the prior art, wherein the method omits the processes of coating, baking, rubbing and the like of the alignment layer in the previous process, and omits the processes of attaching the polarizer and the like in the subsequent process, and the manufacturing cost of the liquid crystal cell without the pretilt angle can be greatly reduced. In this regard, the present example does not limit the method of preparing the non-pretilt liquid crystal cell. The homogeneous mixture is injected into a cell without pretilt angle, and the viscosity of the homogeneous mixture is low due to the low polymer content. Therefore, the liquid crystal material can be injected into a liquid crystal box without pretilt angle according to the conventional process of a liquid crystal display (LCD for short), and can also be other process methods. In this regard, the implantation method is not limited in this embodiment.
The specific implementation manner of this embodiment is similar to that of the embodiment, and details thereof are not described again.
In summary, the invention provides a method for manufacturing a trans-polymer liquid crystal display with a cellular network and a display panel. The preparation method comprises the following steps: introducing a polymer into the negative nematic liquid crystal to prepare a mixed system, wherein the mass of the polymer accounts for 15-30% of the mass of the mixed system and does not contain 15% and 30%; pouring the mixed system into a liquid crystal box without a pretilt angle; and (3) exposing the liquid crystal box filled with the mixed system and without a pretilt angle in a point light source mode by using vertical plane incident collimated ultraviolet rays to prepare the trans-polymer honeycomb network liquid crystal display. The problem that the prior art cannot realize high light transmittance, low driving voltage and strong scattering effect at the same time can be solved. Through the vertical incidence collimation ultraviolet ray, the polymer silk chain network polymerized by the vertical plane plays a role in enabling the liquid crystal to be arranged and oriented in the vertical plane, so that the liquid crystal has higher light transmittance in zero electric field, and the effect that the thin film layer achieves strong scattering after the electric field is applied can be achieved.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A method for preparing a trans-polymer honeycomb-net liquid crystal display is characterized by comprising the following steps:
introducing a polymer into the negative nematic liquid crystal, and uniformly mixing to obtain a mixed system, wherein the mass of the polymer accounts for 15-30% of the mass of the mixed system and does not contain 15% and 30%;
pouring the mixed system into a non-pretilt-angle liquid crystal box made of a glass substrate plated with a conductive layer;
and (3) exposing the liquid crystal box filled with the mixed system and without a pretilt angle in a point light source mode by using ultraviolet light incident in a vertical plane collimation manner to prepare the trans-polymer honeycomb network liquid crystal display.
2. The production method according to claim 1,
the polymer is obtained by introducing a photoinitiator into a prepolymer monomer.
3. The production method according to claim 2,
the mass of the photoinitiator represents 1% of the mass of the polymer.
4. The production method according to claim 3,
the prepolymer monomer refers to a photopolymerizable monomer which is easily polymerized along the propagation direction of a light beam.
5. The production method according to claim 4,
and after the polymer is exposed in a point light source mode through ultraviolet light which is collimated and incident by the vertical plane, a polymer honeycomb pore channel network which is uniformly distributed in one dimension along the normal direction in the liquid crystal box without the pretilt angle is formed.
6. The production method according to claim 5,
and after the negative nematic liquid crystal is exposed in a point light source mode through ultraviolet light which is collimated and incident by the vertical plane, the surface of the liquid crystal box without the pretilt angle is formed to be in a one-dimensional vertical arrangement distribution state along the normal direction of the liquid crystal box without the pretilt angle.
7. A display panel is characterized in that a plurality of pixels are arranged in a matrix,
the display panel is prepared based on the preparation method of the trans-polymer honeycomb network liquid crystal display as claimed in any one of claims 1 to 6.
8. The display panel according to claim 7,
the display substrate is in a transparent state in a zero electric field and is in a scattering fog state when an electric field is applied.
9. The display panel according to claim 8,
the transparent state refers to a one-dimensional vertical arrangement distribution state of the negative nematic liquid crystal on the surface of the liquid crystal box without the pretilt angle along the normal direction of the liquid crystal box without the pretilt angle;
the scattering state refers to the distribution state of the negative nematic liquid crystal parallel to the liquid crystal box without pretilt angle along the direction of a vertical electric field on the surface of the liquid crystal box without pretilt angle.
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