CN111273477A - Liquid crystal display layer, preparation method thereof and liquid crystal display panel - Google Patents
Liquid crystal display layer, preparation method thereof and liquid crystal display panel Download PDFInfo
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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
- G02F1/133—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
-
- 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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Dispersion Chemistry (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention belongs to the technical field of liquid crystal display, and particularly relates to a liquid crystal display layer, a preparation method thereof and a liquid crystal display panel. The liquid crystal display layer comprises a plurality of curing colloids formed by curing a plurality of UV light curing colloids, and cholesteric liquid crystals are dispersed around the curing colloids. According to the liquid crystal display layer, the UV light curing glue is subjected to light curing reaction in the designated area through the mask plate provided with the plurality of mutually independent light-transmitting patterns to form the solid glue, so that the bonding force of the obtained liquid crystal display layer is still strong even if the concentration of the UV light curing glue is low, the liquid crystal display layer is used in a liquid crystal display panel, the brightness and the contrast of the liquid crystal display panel can be improved, and the liquid crystal display layer has good photoelectric performance.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a liquid crystal display layer, a preparation method thereof and a liquid crystal display panel.
Background
The liquid crystal material is called as wonderful substance in nature, has both liquid fluidity and crystal anisotropy, and has double dielectric constant and refractive index, so that the liquid crystal has wide application in the display field, and the liquid crystal display with small size has become the mainstream display technology at present. The liquid crystal materials with different phase states have different applications, for example, cholesteric liquid crystal can generate Bragg reflection, has the characteristic of bistable state at the same time, and can be used for manufacturing liquid crystal handwriting boards.
Cholesteric liquid crystal ewriter polymer networks can be created by several polymer dispersed liquid crystal types; including Polymerization Induced Phase Separation (PIPS), Temperature Induced Phase Separation (TIPS), or Solvent Induced Phase Separation (SIPS). PIPS is a polymerization initiated using light and ultimately results in phase separation of the liquid crystal molecules and the polymer structure; TIPS is a process that uses temperature to initiate a chemical reaction, resulting in a liquid crystal phase that separates from the polymer structure; SIPS is the phase separation of liquid crystals from polymer structures using solvent evaporation; all the above methods are to mix a prepolymer of the polymer with the liquid crystal and disperse the polymer in the liquid crystal after phase separation. The core role of the polymer is the adhesion of the upper and lower substrates, but in order to improve the contrast and reduce the driving voltage, the addition amount of the polymer needs to be as small as possible, and it is difficult to ensure a good adhesion effect.
Disclosure of Invention
The invention aims to provide a liquid crystal display layer, a preparation method thereof and a liquid crystal display panel, and aims to solve the technical problems that the existing liquid crystal display layer is poor in bonding effect and the like easily caused by a small addition amount of a polymer.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the invention provides a preparation method of a liquid crystal display layer, which comprises the following steps:
providing a polymer dispersed liquid crystal material and a mask;
covering the mask plate above the polymer dispersed liquid crystal material to perform a first photocuring reaction, wherein the mask plate is provided with a plurality of mutually independent light-transmitting patterns;
and removing the mask plate, and carrying out a second photocuring reaction to obtain the liquid crystal display layer.
As a preferable technical scheme of the invention, the width of the single light-transmitting pattern is 10-50 μm.
As a further preferable technical solution of the present invention, the minimum lateral pitch and/or the minimum longitudinal pitch between the light-transmissive pattern and the adjacent light-transmissive pattern is 50 μm to 200 μm.
In a preferred embodiment of the present invention, the light intensity of the first photo-curing reaction is 5mW/cm2-15mW/cm2。
As a preferable technical scheme of the invention, the time of the first photocuring reaction is 1-5 min.
In a preferred embodiment of the present invention, the light intensity of the second photo-curing reaction is 5mW/cm2-15mW/cm2。
As a preferable technical scheme of the invention, the time of the second photocuring reaction is 3min-10 min.
As a preferred technical solution of the present invention, the polymer dispersed liquid crystal material comprises the following components by weight percent, based on 100% of the total weight of the polymer dispersed liquid crystal material:
70% -80% of cholesteric liquid crystal;
20-30% of UV light curing adhesive.
As a further preferable technical scheme of the present invention, the UV light curing glue comprises the following components by weight percent, based on 100% of the total weight of the UV light curing glue:
the invention also provides a liquid crystal display layer which comprises a plurality of cured colloids formed by curing the plurality of UV light cured adhesives, and cholesteric liquid crystals are dispersed around the cured colloids.
In another aspect, the present invention provides a liquid crystal display panel, which includes a first substrate and a second substrate that are disposed opposite to each other, and a liquid crystal display layer interposed between the first substrate and the second substrate, wherein the second substrate has light transmittance; the liquid crystal display layer is prepared by the preparation method of the liquid crystal display layer or comprises a cavity formed by curing a plurality of UV light curing adhesives, and cholesteric liquid crystal is dispersed in the cavity.
In a preferred embodiment of the present invention, the thickness of the liquid crystal display layer is 3 μm to 20 μm.
In a preferred embodiment of the present invention, the first substrate is an electrode substrate including a first electrode.
In a preferred embodiment of the present invention, the second substrate is an electrode substrate including a second electrode.
In the preparation method of the liquid crystal display layer, the mask is covered above the polymer dispersed liquid crystal material for carrying out the first photocuring reaction, because the mask is provided with a plurality of mutually independent light-transmitting patterns, ultraviolet light can pass through the light-transmitting patterns but can be shielded by the positions except the light-transmitting patterns on the mask, the ultraviolet light can only irradiate a part of the polymer dispersed liquid crystal material through the light-transmitting patterns to cause the polymer dispersed liquid crystal material to carry out the curing reaction, and UV photocuring glue in the part of the polymer dispersed liquid crystal material is shrunk and cured from a liquid state and is converted into solid UV photocuring glue, namely curing glue; along with the gradual reduction of the concentration of the irradiated liquid UV light-curing glue in the polymer dispersed liquid crystal material, a concentration difference is formed between the irradiated liquid UV light-curing glue and the non-irradiated liquid UV light-curing glue in the polymer dispersed liquid crystal material, the non-irradiated liquid UV light-curing glue in the polymer dispersed liquid crystal material migrates to the solid UV light-curing glue under the traction force of the solid UV light-curing glue, and is subjected to curing reaction and is converted into a solid state after being in contact with illumination. And after the first photocuring reaction, removing the mask plate for the second photocuring reaction to ensure that all the liquid UV photocuring glue is converted into a solid to form a cured glue body. The preparation method of the invention skillfully utilizes the mask, and can provide enough adhesive force under the condition of lower concentration of UV light curing adhesive addition amount by polymerizing the UV light curing adhesive in the designated area to form the curing adhesive.
The UV light curing glue of the liquid crystal display layer is cured and polymerized in a plurality of designated areas to form the curing glue with the bonding effect, so that bonding points can be formed at a plurality of positions to achieve a better bonding effect. Meanwhile, cholesteric liquid crystal is dispersed around the curing colloid, and the curing colloid has better photoelectric property.
According to the liquid crystal display panel, the liquid crystal display layer comprising the cholesteric liquid crystal and the plurality of curing colloids is clamped between the first substrate and the second substrate, and the curing colloids are distributed at a plurality of positions on the liquid crystal display layer to form bonding points, so that the liquid crystal display layer has stronger bonding force with the first substrate and the second substrate, the brightness and the contrast of the liquid crystal display panel are further improved, and the liquid crystal display panel has good photoelectric performance.
Drawings
FIG. 1 is a schematic plan view of a liquid crystal display layer provided in accordance with one embodiment of the present invention during a fabrication process;
FIG. 2 is a cross-sectional view A-A of FIG. 2;
FIG. 3 is a schematic diagram of an arrangement structure of cholesteric liquid crystal molecules in a transmissive state of a liquid crystal display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an arrangement structure of cholesteric liquid crystal molecules of a liquid crystal display panel in a diffuse reflection state according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an arrangement structure of cholesteric liquid crystal molecules in a color development state of a liquid crystal display panel according to an embodiment of the present invention;
wherein the reference numerals in fig. 2 are as follows:
10-a first substrate; 12-a first electrode; 20-a liquid crystal display layer; 30-a second substrate; 32-a second electrode; 40-mask.
Detailed Description
In order to make the objects, technical solutions and technical effects of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and the embodiments described below are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive step in connection with the embodiments of the present invention shall fall within the scope of protection of the present invention. Those whose specific conditions are not specified in the examples are carried out according to conventional conditions or conditions recommended by the manufacturer; the reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be understood that the weight of the related components mentioned in the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, it is within the scope of the disclosure that the content of the related components is scaled up or down according to the embodiments of the present invention. Specifically, the weight described in the embodiments of the present invention may be a unit of mass known in the chemical field such as μ g, mg, g, kg, etc.
In the description of the invention, an expression of a word in the singular should be understood to include the plural of the word, unless the context clearly dictates otherwise. The terms "comprises" or "comprising" are intended to specify the presence of stated features, quantities, steps, operations, elements, portions, or combinations thereof, but are not intended to preclude the presence or addition of one or more other features, quantities, steps, operations, elements, portions, or combinations thereof.
In the description of the present invention, when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.
In this specification, "lower" or "upper" is not an absolute concept, but may be a relative concept that can be explained by replacing "upper" or "lower", respectively, according to the viewpoint of the observer.
The embodiment of the invention provides a preparation method of a liquid crystal display layer, which comprises the following steps:
s1, providing a polymer dispersed liquid crystal material and a mask;
s2, covering a mask plate above the polymer dispersed liquid crystal material to perform a first photocuring reaction, wherein the mask plate is provided with a plurality of mutually independent light-transmitting patterns;
and S3, removing the mask plate, and carrying out a second photocuring reaction to obtain the liquid crystal display layer.
In the preparation method of the liquid crystal display layer, the mask is covered above the polymer dispersed liquid crystal material for carrying out the first photocuring reaction, because the mask is provided with a plurality of mutually independent light-transmitting patterns, ultraviolet light can pass through the light-transmitting patterns but can be shielded by the positions except the light-transmitting patterns on the mask, the ultraviolet light can only irradiate a part of the polymer dispersed liquid crystal material through the light-transmitting patterns to cause the polymer dispersed liquid crystal material to carry out the curing reaction, and UV photocuring glue in the part of the polymer dispersed liquid crystal material is shrunk and cured from a liquid state and is converted into solid UV photocuring glue, namely cured colloid; along with the gradual reduction of the concentration of the irradiated liquid UV light-curing glue in the polymer dispersed liquid crystal material, a concentration difference is formed between the irradiated liquid UV light-curing glue and the non-irradiated liquid UV light-curing glue in the polymer dispersed liquid crystal material, the non-irradiated liquid UV light-curing glue in the polymer dispersed liquid crystal material migrates to the solid UV light-curing glue under the traction force of the solid UV light-curing glue, and is subjected to curing reaction and is converted into a solid state after being in contact with illumination. And after the first photocuring reaction, removing the mask plate for the second photocuring reaction to ensure that all the liquid UV photocuring glue is converted into a solid to form a cured glue body. The preparation method of the embodiment of the invention skillfully utilizes the mask, and can provide enough adhesive force under the condition of lower concentration of UV light curing adhesive addition amount by polymerizing the UV light curing adhesive in the designated area to form the curing adhesive.
Specifically, the UV light curing glue is included in the polymeric dispersed liquid crystal material of S1, so that a UV light curing reaction may occur. However, in the existing polymer dispersed liquid crystal material, the content of the UV light curing glue is generally over 35%, so that the uniform and stable solid UV light curing glue can be successfully cured to play a role in bonding. Since the excessively high content of the UV light-curable glue has a problem of high requirement on the driving voltage, in some embodiments, a novel polymer dispersed liquid crystal material is provided, which comprises 70 wt% to 80 wt% of cholesteric liquid crystal and 20 wt% to 30 wt% of UV light-curable glue, based on 100% of the total weight of the polymer dispersed liquid crystal material, and when the polymer dispersed liquid crystal material is used for preparing a liquid crystal display layer, the driving voltage can be reduced on the premise of ensuring the adhesive force of the liquid crystal display layer. The cholesteric liquid crystal is driven by different voltages to be in a P state, an FC state and an H state, has electric field controllability and is suitable for a liquid crystal display panel; when the UV light curing adhesive is used for preparing a liquid crystal display layer, the UV light curing adhesive has influence on the display brightness, the handwriting thickness and other effect changes. In particular, cholesteric liquid crystals are typically, but not by way of limitation, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80% by mass, based on the polymer dispersed liquid crystal material; UV light-curable glues typically, but not exclusively, comprise 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% by mass.
The preparation method of the polymer dispersed liquid crystal material of the embodiment of the invention can adopt the conventional method in the field. For example: and mixing the cholesteric liquid crystal and the UV light curing glue according to the formula amount, and stirring at the rotating speed of 900-1000 rpm for 1-2 h until the mixture is in a clear and transparent state, and stopping stirring to obtain the polymer dispersed liquid crystal material.
Further, the embodiment of the invention provides a novel UV light curing glue for preparing a polymer dispersed liquid crystal material, which comprises the following components in percentage by mass based on the total weight of the UV light curing glue as 100 percent:
the UV light-cured adhesive provided by the embodiment of the invention comprises aliphatic polyurethane acrylate, hydroxyethyl methacrylate, isobornyl acrylate, polyfunctional acid acrylate and α' -dimethylbenzoyl ketal, and the prepared UV light-cured adhesive can rapidly initiate unsaturated bonds to generate polymerization reaction under proper illumination through a specific content proportion, so that the effect of converting liquid state into curing is realized, and the UV light-cured adhesive has the advantages of good bonding effect, high curing speed, low energy consumption and no solvent pollution.
The selection and content of the aliphatic urethane acrylate as the matrix resin of the UV light curing adhesive determine the characteristics of the cured material. The embodiment of the invention has the advantages of increasing the flexibility of the obtained solid UV light curing adhesive and improving the adhesive force by adopting the aliphatic polyurethane acrylate with simple and flexible synthesis process. Specifically, the aliphatic urethane acrylate is typically, but not limited to, 20%, 22%, 24%, 25%, 26%, 28%, 30% by mass based on the UV light-curable adhesive.
Hydroxyethyl methacrylate, isobornyl acrylate and polyfunctional acid acrylate are jointly used as the reactive diluent of the UV light curing adhesive in the embodiment of the invention, and the reactive diluent plays roles of dilution and crosslinking on the premise of ensuring the compatibility with aliphatic polyurethane acrylate, and the selection and the content of the reactive diluent have great influence on the performance of the formed solid UV light curing adhesive. The hydroxyethyl methacrylate has better cross-linking property, and can improve the caking property of the obtained solid UV light curing adhesive; isobornyl acrylate has the advantages of low toxicity, low volatility, high curing speed and small shrinkage; the polyfunctional acidic acrylate can compensate the photopolymerization activity of the aliphatic polyurethane acrylate, so that the reaction rate is higher. Specifically, the typical but not limiting mass content of hydroxyethyl methacrylate based on the UV light curable glue is 25%, 27%, 29%, 30%, 32%, 35%; typical but not limiting mass contents of isobornyl acrylate are 25%, 27%, 29%, 30%, 32%, 35%; typical, but not limiting, amounts of polyfunctional acidic acrylates are 3%, 4%, 5%, 6%, 7% by mass.
The embodiment of the invention adopts α '-dimethylbenzylketal with higher photoinitiation efficiency as the photoinitiator, has the advantages of fast photoreaction and insusceptibility to other components, and particularly, based on the UV photocuring glue, the α' -dimethylbenzylketal has typical but non-limiting mass contents of 3%, 4%, 5%, 6% and 7%.
For example, the aliphatic polyurethane acrylate, the hydroxyethyl methacrylate, the isobornyl acrylate and the α' -dimethylbenzylketal with the formula amount are mixed and stirred, and the stirring is carried out for 1h-2h at the rotating speed of 200rpm-400rpm under the condition of keeping out of the sun until no obvious large particles or conglobation/block substances exist in the mixture, so as to obtain the UV light curing adhesive.
In S2, since the mask has a plurality of independent light-transmitting patterns, ultraviolet light can pass through the light-transmitting patterns but can be blocked by other positions than the light-transmitting patterns, so that the ultraviolet light can only pass through the light-transmitting patterns and irradiate the polymer dispersed liquid crystal material under the light-transmitting patterns, and thus the partial region is called an "exposure region"; accordingly, a region blocked by an opaque position other than the light-transmitting pattern on the mask plate and not irradiated is referred to as a "non-exposure region". In the first photocuring process, the UV photocuring glue in the polymer dispersed liquid crystal material in the exposure area is shrunk and cured from a liquid state and is converted into a solid UV photocuring glue; along with the gradual reduction of the concentration of the liquid UV light-curing adhesive in the polymer dispersed liquid crystal material of the exposure area, a concentration difference is formed between the liquid UV light-curing adhesive in the polymer dispersed liquid crystal material of the non-exposure area and the liquid UV light-curing adhesive in the polymer dispersed liquid crystal material of the non-exposure area, the liquid UV light-curing adhesive in the polymer dispersed liquid crystal material of the non-exposure area migrates to the exposure area under the traction force of the solid UV light-curing adhesive, and is subjected to curing reaction and is converted into a.
If the curing glue formed after the UV light curing glue is cured is too thick, more UV light curing glue is needed at the moment, and the reduction of the driving voltage is not facilitated. Therefore, in some embodiments, the width of the light-transmitting pattern on the mask is set to be 10 μm to 50 μm, preferably 5 μm to 30 μm, so that the thickness of the formed cured adhesive is moderate, and excessive consumption of the UV light curing adhesive is avoided. Specifically, typical, but not limiting, light transmissive patterns have widths of 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm.
Cholesteric liquid crystals are dispersed between curing colloids formed after the UV light curing glue is cured, if the distance between two light-transmitting patterns is too large, the amount of the cholesteric liquid crystals needed is large, and accordingly the content of the UV light curing glue is too low, and sufficient bonding force cannot be provided; if the distance between the two transparent patterns is too small, the distance between the cured glue formed after the UV light curing glue is too short, and the cholesteric liquid crystal is difficult to disperse around the cured glue, which affects the brightness and contrast of the liquid crystal display layer. Accordingly, in some embodiments, the minimum lateral and/or longitudinal spacing between the light transmissive pattern and the adjacent light transmissive pattern is set to be 50 μm to 200 μm, preferably 20 μm to 100 μm. Wherein, it can be understood that, when the light-transmitting pattern is a pattern in which a plurality of transverse stripes and a plurality of longitudinal stripes intersect, the minimum transverse distance between two adjacent transverse stripes is 50 μm-200 μm; the minimum longitudinal distance between two adjacent longitudinal stripes is 50-200 μm. Specifically, the minimum lateral or longitudinal pitch between a typical, but non-limiting, light transmissive pattern and an adjacent light transmissive pattern is 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm.
The shape of the transparent pattern of the mask is not limited in the embodiments of the present invention, and may be, for example, a straight line shape, a wave shape, a rectangle shape, a polygon shape, or other irregular shapes, and any pattern that can satisfy the requirement that the formed solid UV light curing adhesive has micro-area segmentation can be adopted by the present invention. In some embodiments, it is preferable to form the shape of the transparent pattern into a regular shape, such as a straight line shape, a wavy line shape with regular height of undulation, a rectangular shape, an equilateral triangle, etc., so that the formed cured gel has a regular shape to improve its adhesive force.
The mutual position relation and the number of the light-transmitting patterns on the mask plate determine the number and the bonding force of the bonding points of the cured colloid formed after curing. The more the number of the light-transmitting patterns is, the more the formed cured colloid is dispersed, the more the bonding force is, and accordingly, the better the bonding effect is. Similarly, the more uniform the distribution of the light-transmitting patterns on the mask, the more uniform the exposure area formed on the liquid crystal display layer, and the better the bonding effect. Therefore, in some embodiments, it is preferable to set the light-transmissive patterns to be uniformly distributed on the reticle, and the larger the number, the better. The uniformly distributed light-transmitting patterns can ensure that the formed curing colloid is uniformly distributed on the liquid crystal display layer; the more the light-transmitting patterns are, the more the amount of the cured colloid is correspondingly formed, and the bonding force of the liquid crystal display layer can be further improved when the liquid crystal display layer is used for bonding.
Further, as shown in fig. 1, when the light-transmitting pattern is a plurality of regular horizontal lines and a plurality of regular vertical lines, and each horizontal line and each vertical line are perpendicular to each other, the cured colloid shape formed by light curing is a "frame" of the square unit in the figure. At this time, the solid colloid forms a dense network structure, and the cholesteric liquid crystal is dispersed in the 'holes' of the dense network structure, so that the resolution of the obtained liquid crystal display layer can be improved.
The ultraviolet illumination intensity and the illumination time of the light curing reaction have correlation with the speed and the effect of converting the liquid state molding of the UV light curing adhesive into the solid state, and influence on the reliability and the stability of the obtained liquid crystal display layer. Thus, in some embodiments, the light intensity of the first photocuring reaction is 5mW/cm2-15 mW/cm2Specifically, the first photocuring reaction typically has, but not limited to, a light intensity of 5mW/cm2、7mW/cm2、9mW/cm2、10mW/cm2、12mW/cm2、14mW/cm2、15mW/cm2(ii) a The time of the first photocuring reaction is 1min-5min, and specifically, typical but not limiting time of the first photocuring reaction is 1min, 2min, 3min, 4min and 5 min.
In S3, the mask is removed to perform a second photo-curing reaction. And through the second light curing reaction, all the liquid UV light curing glue is ensured to be converted into a solid state, and a plurality of curing glue bodies are formed.
In some embodiments, the light intensity of the second photocuring reaction is 5mW/cm2-15 mW/cm2Specifically, the second photocuring reaction typically has, but not limited to, a light intensity of 5mW/cm2、7mW/cm2、9mW/cm2、10mW/cm2、12mW/cm2、14mW/cm2、15mW/cm2(ii) a The time of the second photocuring reaction is 3min-10min, and specifically, the second photocuring reaction is typicalAnd non-limiting times are 3min, 4min, 5min, 6min, 7min, 8min, 9min, and 10 min.
The embodiment of the invention also provides a liquid crystal display layer which comprises a plurality of solidified colloids formed by solidifying the plurality of UV light solidified colloids, and cholesteric liquid crystals are dispersed around the solidified colloids.
The UV light curing glue of the liquid crystal display layer is cured and polymerized in the designated areas to form the curing glue with the bonding effect, so that bonding points can be formed at a plurality of positions to achieve a better bonding effect. Meanwhile, cholesteric liquid crystal is dispersed around the curing colloid, and the curing colloid has better photoelectric property.
With reference to fig. 2, an embodiment of the present invention further provides a liquid crystal display panel, which includes a first substrate 10 and a second substrate 30 that are oppositely disposed, and a liquid crystal display layer 20 interposed between the first substrate 10 and the second substrate 30, and the second substrate 30 has light transmissivity; the liquid crystal display layer 20 is a liquid crystal display layer prepared by the above preparation method of the liquid crystal display layer or a liquid crystal display layer including a cavity formed by curing a plurality of UV light curing adhesives, and cholesteric liquid crystals are dispersed in the cavity.
According to the liquid crystal display panel, the liquid crystal display layer comprising the cholesteric liquid crystal and the plurality of curing colloids is clamped between the first substrate and the second substrate, and the curing colloids are distributed at a plurality of positions on the liquid crystal display layer to form bonding points, so that the liquid crystal display layer has strong bonding force with the first substrate and the second substrate, the brightness and the contrast of the liquid crystal display panel are further improved, and the liquid crystal display panel has good photoelectric performance.
It should be noted that in fig. 2, the sizes of layers and regions are exaggerated for clarity of illustration, so as to facilitate description from the perspective of an observer. If a structure is referred to as being "on" another structure, it is to be understood that the structure can be directly on the other structure or additional structures can be interposed between the structure and the other structure. Like reference numerals refer to like structures throughout the specification.
The working principle of the liquid crystal display panel of the embodiment of the invention is as follows: liquid UV light curing glue in the polymer dispersed liquid crystal material is polymerized and cured in a designated area to form a curing colloid with an adhesive effect, and cholesteric liquid crystal molecules are dispersed around the curing colloid. When a voltage Ec is applied to the first electrode and the second electrode, the cholesteric liquid crystal molecules are vertically aligned and in an H state, and in this case, a transmission state (as shown in FIG. 3); when the voltage is between 0 and Ec, the anchoring force of the cured colloid provides traction force to the cholesteric liquid crystal molecules due to the cholesteric liquid crystal molecules around the cured colloid, so that the cholesteric liquid crystal molecules are arranged in an FC state, and the state is a diffuse reflection state (shown in figure 4); when pressure is applied to the outside, the cholesteric liquid crystal molecules are in a regularly arranged P state, bragg reflection is carried out on incident light at the time, the cholesteric liquid crystal molecules are in a color rendering state, and clear writing can be presented (as shown in figure 5).
The thickness of the liquid crystal display layer 20 has a direct influence on both the display effect and the stability of the resulting liquid crystal display panel. Therefore, in some embodiments, the thickness of the liquid crystal display layer 20 is set to 3 μm to 20 μm. Specifically, the liquid crystal display layer 20 typically has, but not limited to, a thickness of 3 μm, 5 μm, 10 μm, 15 μm, or 20 μm.
The material of the first substrate 10 and/or the second substrate 30 may be selected from materials conventional in the art. In some embodiments, the first substrate 10 and/or the second substrate 30 are made of a flexible material, so that roll-to-roll production can be realized, which is beneficial to improving production efficiency and quality.
In some embodiments, the first substrate 10 is an electrode substrate including the first electrode 12.
In some embodiments, the second substrate 30 is an electrode substrate including a second electrode 32.
In some embodiments, the side of the first substrate 10 remote from the first electrode 12 is also coated with a translucent/opaque, light-absorbable dark background. When the cholesteric liquid crystal molecules are in an H state, light directly passes through the second substrate 30, the liquid crystal display layer 20 and the first electrode 12, and is absorbed by the dark background of the first substrate 10, and at this time, the liquid crystal display panel presents the dark background color of the first substrate 10.
Indium tin oxide has excellent conductivity, and the manufacturing method of the indium tin oxide as the transparent electrode is mature, so in some embodiments, the main component of the first electrode 12 and/or the second electrode 32 is Indium Tin Oxide (ITO), so that the obtained liquid crystal display panel has high conductivity, good visible light transmittance, high mechanical strength and excellent chemical stability.
In order to make the details and operations of the above-mentioned embodiments of the present invention clearly understood by those skilled in the art, and to make the progress of the liquid crystal display layer, the method for manufacturing the same, and the liquid crystal display panel of the embodiments of the present invention obviously manifest, the above-mentioned technical solutions are exemplified by a plurality of embodiments below.
Example 1
A preparation method of UV light curing glue comprises the following steps:
(1) taking 100 parts by weight of UV light curing adhesive, sequentially adding 26 parts by weight of aliphatic urethane acrylate, 35 parts by weight of hydroxyethyl methacrylate, 25 parts by weight of isobornyl acrylate, 7 parts by weight of polyfunctional acid acrylate and 7 parts by weight of α' -dimethylbenzylketal into a stirring tank;
(2) and (3) installing a stirring rod, covering the opening of the tank by using an opaque plate to avoid direct light irradiation, stirring at the rotating speed of 200r/min for 1h, and stopping stirring until no obvious large particles or conglobation/block-shaped substances exist in the mixture to obtain the finished UV light curing adhesive.
The UV light curing adhesive is used for preparing a polymer dispersed liquid crystal material, and comprises the following steps:
(a) taking 100 parts by weight of polymer dispersed liquid crystal material, and sequentially adding 70 parts by weight of L001 and 30 parts by weight of UV (ultraviolet) light curing adhesive into a beaker;
(b) and (3) putting a magnetic stirrer into a beaker, putting the beaker on a stirring table, stirring for 1h at the rotating speed of 900r/min, and stopping stirring until the mixture is clear and transparent, wherein the obtained mixture is the polymer dispersed liquid crystal material.
Example 2
A preparation method of UV light curing glue comprises the following steps:
(1) taking 100 parts by weight of UV light curing adhesive, sequentially adding 30 parts by weight of aliphatic polyurethane acrylate, 25 parts by weight of hydroxyethyl methacrylate, 35 parts by weight of isobornyl acrylate, 3 parts by weight of polyfunctional acid acrylate and 7 parts by weight of α' -dimethylbenzylketal into a stirring tank;
(2) and (3) installing a stirring rod, covering the opening of the tank by using an opaque plate to avoid direct light irradiation, stirring at the rotating speed of 400r/min for 2 hours, and stopping stirring until no obvious large particles or conglobation/block-shaped substances exist in the mixture to obtain the finished UV light curing adhesive.
The UV light curing adhesive is used for preparing a polymer dispersed liquid crystal material, and comprises the following steps:
(a) taking 100 parts by weight of polymer dispersed liquid crystal material, and sequentially adding 80 parts by weight of L001 and 20 parts by weight of UV (ultraviolet) light curing adhesive into a beaker;
(b) and (3) putting the magnetic stirrer into a beaker, putting the beaker on a stirring table, stirring for 2 hours at the rotating speed of 1000r/min, and stopping stirring until the mixture is clear and transparent, wherein the obtained mixture is the polymer dispersed liquid crystal material.
Example 3
A preparation method of UV light curing glue comprises the following steps:
(1) taking 25 parts by weight of aliphatic polyurethane acrylate, 31 parts by weight of hydroxyethyl methacrylate, 30 parts by weight of isobornyl acrylate, 7 parts by weight of polyfunctional acid acrylate and 7 parts by weight of α' -dimethylbenzylketal, and sequentially adding the components into a stirring tank by taking 100 parts by weight of UV light curing adhesive;
(2) and (3) installing a stirring rod, covering the opening of the tank by using an opaque plate to avoid direct light irradiation, stirring at the rotating speed of 300r/min for 1.5h, and stopping stirring until no obvious large particles or conglobation/block-shaped substances exist in the mixture to obtain the finished UV light curing adhesive.
The UV light curing adhesive is used for preparing a polymer dispersed liquid crystal material, and comprises the following steps:
(a) taking 75 parts by weight of L001 and 25 parts by weight of UV light curing adhesive based on 100 parts by weight of polymer dispersed liquid crystal material, and sequentially adding the materials into a beaker;
(b) and (3) putting a magnetic stirrer into a beaker, putting the beaker on a stirring table, stirring for 1.5 hours at the rotating speed of 950r/min, and stopping stirring until the mixture is clear and transparent, wherein the obtained mixture is the polymer dispersed liquid crystal material.
Example 4
Putting the polymer dispersed liquid crystal material obtained in the example 1 into a beaker, adding 3-10 μm space powder (spacer), placing the beaker on a stirring table, stirring for 1-2 h at the rotating speed of 300-600 r/min by a stirring paddle, stopping stirring, standing the solution for 0.5-1 h, and coating and curing to produce a liquid crystal display panel after bubbles in the solution disappear, wherein the specific steps are as follows:
(i) dripping the mixture to the included angle formed by two ITO films by using a glue dripping device (3), wherein the mixture is uniformly extruded and coated between the two ITO films under the rolling drive of the glue roller;
(ii) the coated ITO film enters a UV lamp box, slit irradiation is carried out at the position of a mask plate to form a preferential partition wall shape, the retention curing time is 30-60 s, and then the diaphragm continuously enters the next section of UV lamp box;
(iii) irradiating in a second section of UV lamp box, continuously separating liquid crystal and UV glue in the mixture, forming a solid glue chain state after the UV glue is irradiated, forming a stable liquid crystal state after the liquid crystal is separated from the mixed state, and staying for curing for 120-240 s;
(iv) and (4) winding the cured product on a sleeve to complete the product, thus obtaining the liquid crystal display panel.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for preparing a liquid crystal display layer is characterized by comprising the following steps:
providing a polymer dispersed liquid crystal material and a mask;
covering the mask plate above the polymer dispersed liquid crystal material to perform a first photocuring reaction, wherein the mask plate is provided with a plurality of light-transmitting patterns;
and removing the mask plate, and carrying out a second photocuring reaction to obtain the liquid crystal display layer.
2. The method of manufacturing a liquid crystal display layer according to claim 1, wherein the width of the individual light-transmitting pattern is 10 μm to 50 μm.
3. The method of manufacturing a liquid crystal display layer according to claim 1, wherein a minimum lateral distance or a minimum longitudinal distance between the light-transmissive pattern and an adjacent light-transmissive pattern is 50 μm to 200 μm.
4. The method for producing a liquid crystal display layer according to claim 1, wherein the light intensity of the first photocuring reaction is 5mW/cm2-15mW/cm2(ii) a And/or
The time of the first photocuring reaction is 1-5 min; and/or
The light intensity of the second photocuring reaction is 5mW/cm2-15mW/cm2(ii) a And/or
The time of the second photocuring reaction is 3-10 min.
5. The method of any one of claims 1 to 4, wherein the polymer dispersed liquid crystal material comprises the following components in percentage by weight, based on 100% by weight of the total polymer dispersed liquid crystal material:
70% -80% of cholesteric liquid crystal;
20-30% of UV light curing adhesive.
6. The method for preparing the liquid crystal display layer according to claim 5, wherein the UV light-curable adhesive comprises the following components in percentage by weight, based on 100% of the total weight of the UV light-curable adhesive:
7. the liquid crystal display layer is characterized by comprising a plurality of solidified colloids formed by solidifying a plurality of UV light solidified adhesives, and cholesteric liquid crystals are dispersed around the solidified colloids.
8. The liquid crystal display panel is characterized by comprising a first substrate, a second substrate and a liquid crystal display layer, wherein the first substrate and the second substrate are oppositely arranged, the liquid crystal display layer is clamped between the first substrate and the second substrate, and the second substrate has light transmittance; wherein the liquid crystal display layer is prepared by the preparation method of the liquid crystal display layer according to any one of claims 1 to 6 or the liquid crystal display layer according to claim 7.
9. The liquid crystal display panel according to claim 8, wherein the liquid crystal display layer has a thickness of 3 μm to 20 μm.
10. The liquid crystal display panel according to claim 8 or 9, wherein the first substrate is an electrode substrate including a first electrode; and/or
The second substrate is an electrode substrate including a second electrode.
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| CN113281933A (en) * | 2021-06-18 | 2021-08-20 | 南京邮电大学 | Patterned transparent liquid crystal/polymer-based display device |
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