CN112684640A - Process for preparing liquid crystal dimming device - Google Patents
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- CN112684640A CN112684640A CN201910991578.0A CN201910991578A CN112684640A CN 112684640 A CN112684640 A CN 112684640A CN 201910991578 A CN201910991578 A CN 201910991578A CN 112684640 A CN112684640 A CN 112684640A
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Abstract
The invention discloses a process for preparing a liquid crystal dimming device, which comprises the following steps: a. providing a first substrate and a second substrate both having a transparent conductive layer; b. forming alignment layers on the sides of the first substrate and the second substrate with the transparent conductive layers respectively and aligning the alignment layers; c. then spreading spacers on the first substrate or the second substrate; d. coating a sealing frame glue on the first substrate or the second substrate to form a sealing frame glue area; e. dripping liquid crystals in the sealing frame glue area; f. performing roll bonding on the first substrate and the second substrate; g. curing the sealing frame glue; h. and c, slicing and subpackaging, wherein at least one of the first substrate and the second substrate is a flexible substrate, and the steps b to g are continuously and circularly performed. The process for preparing the liquid crystal dimming device is simple, improves the production efficiency and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of liquid crystal application, in particular to a process for preparing a liquid crystal dimming device.
Background
At present, a liquid crystal dimming device is used as a photoelectric composite device, which mainly comprises a transparent conductive substrate and a liquid crystal layer, and the arrangement state of liquid crystal molecules is controlled by an external electric field mode, so that the transition of macroscopic states of light transmission and light scattering is realized. The liquid crystal dimming device can be widely applied to industries such as houses, commercial buildings, automobiles and the like to provide a private environment, reduce glare of ambient sunlight, or control harmful ultraviolet effects and the like. For a flexible liquid crystal dimming device, the existing mature technologies are a Polymer Dispersed Liquid Crystal (PDLC) technology and a polymer stabilized cholesteric liquid crystal (PSCT) technology, and the conversion between a light-transmitting state and a scattering state is realized in an electric control dimming mode. However, both of these techniques require the introduction of polymer during the manufacturing process, phase separation by light or light masking, formation of specific polymer network or polymer wall, and provision of stable polymer network structure for liquid crystal, and the manufacturing process is complicated.
In the traditional Liquid Crystal Display (LCD) production process adopting glass as a substrate, the liquid crystal material is mainly poured in two modes, one mode is that a vacuum crystal pouring device is used for pouring after an empty box is manufactured in a non-vacuum environment, the other mode is that liquid crystal is dripped on the substrate in a lattice mode and then is jointed in a vacuum environment, in the aspect of preparing a flexible display device, if roll-to-roll continuous production is used, the production must be carried out in the non-vacuum environment, the liquid crystal filling and the jointing and sealing of an upper sheet and a lower sheet are required to have continuous productivity, if the requirement is met, the steps of spacer scattering, sealant coating, liquid crystal dripping and the like are required to be completed on a single-side substrate before roll-to-roll lamination, particularly, the sealant coating, the liquid crystal dripping and the liquid crystal dripping are required to ensure that the liquid crystal can fill the whole liquid crystal box and the liquid crystal does not overflow the sealant, the distance between the sealant and the like needs to be strictly controlled, and the problems of bubbles in the box, puncture of the sealant or infiltration of liquid crystal and the like are easily caused in the prior art.
Disclosure of Invention
The present invention is directed to a process for manufacturing a liquid crystal light modulator device, which solves the above problems in the prior art.
The invention adopts the following technical scheme:
a process for preparing a liquid crystal dimming device comprises the following steps: a. providing a first substrate and a second substrate both having a transparent conductive layer; b. forming alignment layers on the sides of the first substrate and the second substrate with the transparent conductive layers respectively and aligning the alignment layers; c. then spreading spacers on the first substrate or the second substrate; d. coating a sealing frame glue on the first substrate or the second substrate to form a sealing frame glue area; e. dripping liquid crystals in the sealing frame glue area; f. performing roll bonding on the first substrate and the second substrate; g. curing the sealing frame glue; h. and c, slicing and subpackaging, wherein at least one of the first substrate and the second substrate is a flexible substrate, and the steps b to g are continuously and circularly performed.
Preferably, the step b of aligning the alignment layer adopts roll-to-roll alignment.
Preferably, the flexible substrate is selected from one or more of PET, PEN, PC, PP, PMMA, PBT, PVC, PI.
Preferably, the density of the spacers on the first substrate or the second substrate in the step c is 3-30/mm2。
Preferably, a plurality of the sealant regions are formed in the step d, wherein the width of the sealant is less than 2mm, and the interval between the adjacent sealant regions is 2-10 cm.
Preferably, the manner of dropping liquid crystal in step e includes dropping dot matrix and half seal grid.
Preferably, in the dot matrix, the distance between each dot is 1-5cm, and the distance between the edge of the dot matrix and the sealing frame glue is 0.5 cm.
Preferably, the half seal lattice is formed by firstly dropping the horizontal bars perpendicular to the rolling direction and then dropping the vertical bars parallel to the rolling direction.
Preferably, the distance between the horizontal bar and the adjacent and parallel frame sealing glue is 0.2-1.5cm, the distance between two ends of the horizontal bar and the frame sealing glue is 0.2-1.2cm respectively, the vertical bars comprise a plurality of vertical bars which are arranged in parallel, and the interval between the vertical bars is 0.5-2 cm.
Preferably, the curing of the sealant in the step g includes UV light curing and thermal curing.
Preferably, the UV light intensity of the UV curing is 1-30mw, and the curing time is 0.5-10 min.
Preferably, the curing temperature of the thermal curing is 100-150 ℃, and the curing time is 60 min.
The process for preparing the liquid crystal dimming device is simple, improves the production efficiency and reduces the production cost.
Drawings
The invention may be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic diagram of a roll-to-roll laminating process of a liquid crystal dropping dot matrix in a process of manufacturing a liquid crystal light modulation device according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a latticed pressing of a liquid crystal dropping semi-seal in a process of manufacturing a liquid crystal light adjusting device according to a second embodiment of the present invention;
fig. 3 is a process diagram of a process for manufacturing a liquid crystal dimming device according to a third embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. The illustrated exemplary embodiments of the invention are provided for purposes of illustration only and are not intended to be limiting of the invention. Therefore, it is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.
Hereinafter, a process for manufacturing a liquid crystal dimming device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
The first embodiment:
fig. 1 is a schematic diagram of a roll-to-roll pressing process of a liquid crystal dropping dot matrix in a process for manufacturing a liquid crystal dimming device according to a first embodiment of the present invention.
a. A first substrate 10 and a second substrate 20 each having a transparent conductive layer are provided. In this embodiment, the first substrate 10 and the second substrate 20 are both flexible substrates, for example, one or more selected from PET, PEN, PC, PP, PMMA, PBT, PVC, and PI. The opposite sides of the first substrate 10 and the second substrate 20 each have a transparent conductive layer, for example, selected from ITO, nano silver, graphene, and the like, preferably, selected from ITO layers.
b. Alignment layers (not shown) are formed and aligned on the sides of the first and second substrates 10 and 20 having the transparent conductive layers, respectively. The alignment layer is selected from Polyimide (PI), for example, and may be formed on the sides of the first and second substrates 10 and 20 having the transparent conductive layer by printing, coating, or the like, and rubbing-aligned. In this embodiment, since the first substrate 10 and the second substrate 20 are both flexible substrates, the alignment layer is preferably aligned in a roll-to-roll alignment in step b. In this embodiment, the step of forming the alignment layer by using the roll-to-roll alignment process is different from the conventional process of forming the alignment layer in the liquid crystal display panel or other liquid crystal devices using the glass substrate, in this embodiment, the step of forming the alignment layer is continuous coating using a flexible substrate, an alignment layer pattern with a certain length and size is intermittently and continuously coated on a strip of flexible substrate according to the size requirement of a product, and then the alignment layer pattern is cured in a tunnel furnace. After curing, a rubbing process of the rubbing layer is performed, and rubbing is performed on a rubbing machine in a manner different from that of a liquid crystal display panel or other liquid crystal devices using a glass substrate.
c. Spacers (not shown) are then scattered on the first substrate 10 or the second substrate 20. Spacers are scattered on the first substrate 10 or the second substrate 20 positioned below with a certain density, and the scattering density of the spacers on the first substrate 10 or the second substrate 20 is 3-30/mm2For example, a step density of 10 pieces/mm2. In the present embodiment, the step of spreading spacers is the same as that of conventionally using glassIn the present embodiment, spacers are mixed in a liquid crystal material, and are dispersed on a base material together with a liquid crystal by a subsequent liquid crystal dropping step, and the spacers are uniformly dispersed by a subsequent roll bonding step.
d. The first substrate 10 or the second substrate 20 is coated with a sealant 40 to form a sealant region. Coating two or more closed sealing frame glues 40 with specified sizes on the first substrate 10 or the second substrate 20 positioned below by using a sealing frame glue coating machine according to a mode of a column direction extending along the first substrate 10 or the second substrate 20, so that the width of the sealing frame glue 40 after the subsequent first substrate 10 and the second substrate 20 are attached is less than 2mm, and the interval between adjacent sealing frame glue areas is 2-10 cm.
e. Liquid crystal 30 is dripped into the sealing frame glue area. Calculating the volume of the liquid crystal box and the theoretically required volume of the liquid crystal according to the size of the liquid crystal box and the target box thickness, and designing and adjusting the dripping amount of each drop of liquid crystal according to the number of drops of the liquid crystal. In this embodiment, a dot matrix is formed by instillation, the dot matrix pattern can be adjusted as required, the distance between each dot is 1-5cm, for example, the row distance of the dot matrix is 1cm, the column distance is 1.5cm, and the edge distance of the dot matrix is 0.5cm from the sealing frame glue.
f. The first substrate 10 and the second substrate 20 are roll bonded. The working parameters of the roll-to-roll rolling mechanism are set, and mainly include the gap between the two rollers 50 and the rolling speed, for example, in this embodiment, the first substrate 10 and the second substrate 20 both use flexible base materials with a thickness of 0.125mm, the rolling gap is set to 0.2mm (adjustable in the range of 0-0.25 mm), and the speed is set to 15mm/s (adjustable in the range of 3-50 mm/s). The first substrate 10 or the second substrate 20 coated with the sealing frame glue and the liquid crystal and located below are accurately aligned together and then placed between two rollers 50 of a roll-to-roll rolling and laminating device, and rolling and laminating are performed according to the set working parameters, and the liquid crystal material between the first substrate 10 and the second substrate 20 is uniformly distributed along the roll-to-roll rolling direction due to the gap defined by the spacers.
g. And curing the sealing frame glue 40. And curing the rolled and bonded liquid crystal box to ensure that the sealing frame glue 40 has certain adhesive force, wherein the curing of the sealing frame glue 40 comprises UV light curing and thermocuring. In this embodiment, the UV light intensity in the UV light curing is 1-30mw, for example, 30mw, and the UV light curing time is 0.5-10min, for example, 5min, and then the thermal curing is performed, the thermal curing temperature is 100-150 ℃, for example, the thermal curing temperature is 120 ℃, and the thermal curing time is adjustable within 50-80min, for example, 60 min.
In this embodiment, since the first substrate 10 and the second substrate 20 are both flexible substrates, the unwinding and winding processes are respectively performed before and after the process, and steps b to g in this embodiment are continuously and circularly performed.
h. And (6) slicing and subpackaging. And cutting or shearing a plurality of liquid crystal boxes contained in the workpiece, dividing the liquid crystal boxes into single flexible liquid crystal boxes, and leaving the edge of the electrode pin after cutting so as to be convenient for subsequent connection with a control circuit.
In the embodiment, the flexible liquid crystal box with better uniformity can be manufactured through the continuous steps.
Second embodiment:
in this embodiment, the same points as those in the first embodiment are not described again, but the difference is that in this embodiment, the liquid crystal is dripped in step e in a manner of half seal grid.
Fig. 2 is a schematic diagram of dropping a liquid crystal into a half-seal-grid-like liquid crystal during a process of manufacturing a liquid crystal dimming device according to a second embodiment of the present invention, as shown in fig. 2, in step e, the liquid crystal is dropped into a half-seal-grid-like liquid crystal, the half-seal-grid-like liquid crystal includes a plurality of vertical bars 31 and at least one horizontal bar 32, the vertical bars 31 extend in a direction substantially perpendicular to the horizontal bars 32, the vertical bars 31 extend in a direction parallel to a direction in which the roller 50 presses the first substrate 10 and the second substrate 20, the horizontal bars 32 are located on a side of each of the individual liquid crystal cells close to the roller 50, and preferably, the horizontal bars 32 extend in a direction parallel to a section of the seal frame glue adjacent thereto. In this embodiment, in step e, the half-seal lattice is formed by first dropping the horizontal bars perpendicular to the rolling direction and then dropping the vertical bars parallel to the rolling direction. In step f, when the first substrate 10 and the second substrate 20 are laminated, the two substrates firstly laminate the horizontal bars 32, then laminate along one end of the vertical bars 31, and then continue laminating along the direction in which the vertical bars 31 extend until the whole independent liquid crystal cell region is laminated.
Preferably, the distance between the horizontal bar 32 and the sealing frame glue 40 is 0.2-1.5cm, for example, the distance between the horizontal bar and the sealing frame glue is 0.3 cm; the distance between the two ends of the horizontal bar 32 and the sealing frame glue 40 is 0.2-1.2cm respectively, for example, the distance between the two ends of the horizontal bar 32 and the sealing frame glue 40 is 0.5cm respectively; the vertical bar 31 comprises a plurality of vertical bars which are arranged in parallel, the interval between the vertical bars is 0.5-2cm, for example, the interval between the vertical bars is 1cm, the binding end of the vertical bar 31 is 1.5-8cm away from the frame glue, for example, the binding end of the vertical bar 31 is 2cm away from the frame glue. In this embodiment, the pattern is designed in advance and the total coating length is calculated, the total coating time can be calculated according to the coating speed, the liquid crystal coating amount per unit time can be obtained according to the theoretical liquid crystal consumption, and the setting is performed according to this data, but not limited thereto, and the corresponding setting and calculation can also be performed according to other process parameters, and will not be described again.
The third embodiment:
in this embodiment, the same parts as those in the first and second embodiments are not repeated, but different parts are that in this embodiment, the first substrate 10 and the second substrate 20 are both flexible substrates, and one of the first substrate 10 and the second substrate 20 is placed on the platen 60, and only one roller 50 is used for roll bonding.
Fig. 3 is a schematic process diagram of a process for manufacturing a liquid crystal dimming device according to a third embodiment of the present invention, in step b of this embodiment, a roll-to-roll alignment may still be performed on the first substrate 10 and the second substrate 20 of the two flexible substrates, which is not described again.
In step c of this embodiment, preferably, spacers are scattered on one side of the substrate placed on the platen 60; in step d, preferably, the sealant 40 is coated on one side of the substrate disposed on the platen 60. The base plate arranged on the bedplate 60 has smoother and better pressure stability because the bedplate 60 is supported below, and is beneficial to the dispersion of the spacers and the stability of the coating process of the sealing frame glue.
In step e, the liquid crystal is not limited to the liquid crystal dropping dot matrix shown in fig. 3 in this embodiment, and the liquid crystal may be dropped in a dot matrix or a half-seal grid.
In this embodiment, when the first substrate 10 and the second substrate 20 are rolled and bonded in step f, only one roller is used, as shown in fig. 3. In this embodiment, preferably, the first substrate 10 is disposed on the platen 60, and when the first substrate is rolled and attached, the platen 60 can be rotated by the roller 50 in situ to drive the first substrate 10 to move and attach, or the platen 60 and the first substrate 10 thereon are fixed and the roller rotates and moves and attaches, which is not described again.
In the process for preparing the liquid crystal dimming device, the liquid crystal is dripped into a dot matrix or a semi-seal lattice, and the liquid crystal is uniformly diffused under the pressing action in the rolling and laminating step, so that bubbles are avoided, and the phenomenon that the liquid crystal is larger in amount and overflows the frame glue or the frame glue is diffused too fast or too large to cause the puncture or infiltration of the frame glue is avoided, thereby influencing the quality and the reliability of the product is avoided. According to the invention, the first substrate and the second substrate can be both flexible substrates, or one of the first substrate and the second substrate can be flexible and the other rigid substrate can be rigid, roll-to-roll continuous production can be adopted when two flexible substrates are adopted, and the gap between two rollers or between the rollers and the rigid substrate and the speed control in the production process are carried out, so that the liquid crystal filling effect after lamination is optimal, the problems of liquid crystal filling bubbles and sealing frame glue puncture are avoided, the production cost is greatly reduced while the production rate is greatly improved, and the product yield is improved.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A process for preparing a liquid crystal dimming device is characterized by comprising the following steps:
a. providing a first substrate and a second substrate both having a transparent conductive layer;
b. forming alignment layers on the sides of the first substrate and the second substrate with the transparent conductive layers respectively and aligning the alignment layers;
c. spreading spacers on the first substrate or the second substrate;
d. coating a sealing frame glue on the first substrate or the second substrate to form a sealing frame glue area;
e. dripping liquid crystals in the sealing frame glue area;
f. performing roll bonding on the first substrate and the second substrate;
g. curing the sealing frame glue;
h. cutting the slices and packaging the slices separately,
wherein at least one of the first substrate and the second substrate is a flexible substrate, and the steps b to g are continuously and circularly performed.
2. The process according to claim 1, wherein the step b of aligning the alignment layer is roll-to-roll alignment.
3. The process of claim 1 or 2, wherein the flexible substrate is selected from one or more of PET, PEN, PC, PP, PMMA, PBT, PVC, PI.
4. The process for preparing a liquid crystal dimming device according to claim 1, wherein the density of the spacers on the first substrate or the second substrate in the step c is 3-30 ^ 30mm2。
5. The process for manufacturing a liquid crystal dimming device according to claim 1, wherein a plurality of the sealant regions are formed in the step d, wherein the width of the sealant is less than 2mm, and the interval between the adjacent sealant regions is 2-10 cm.
6. The process for preparing a liquid crystal dimming device according to claim 1, wherein the manner of dropping liquid crystal in the step e comprises dropping dot matrix and half seal grid.
7. The process according to claim 6, wherein the dot matrix has a dot pitch of 1-5cm, and the edge of the dot matrix is 0.5cm from the sealant.
8. The process of claim 6, wherein the half seal lattice is formed by dispensing horizontal bars perpendicular to the rolling direction and then dispensing vertical bars parallel to the rolling direction.
9. The process of claim 8, wherein the distance between the horizontal bar and the adjacent and parallel sealant is 0.2-1.5cm, the distance between two ends of the horizontal bar and the sealant is 0.2-1.2cm, the vertical bar comprises a plurality of vertical bars arranged in parallel, and the interval between the vertical bars is 0.5-2 cm.
10. The process for preparing a liquid crystal dimming device according to claim 1, wherein the curing of the sealant in the step g comprises UV light curing and thermal curing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7276417B1 (en) | 2021-12-21 | 2023-05-18 | 凸版印刷株式会社 | Transparent base material for liquid crystal device, light control sheet, and light control device |
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