CN113514971B - PDLC coating method and coating equipment - Google Patents
PDLC coating method and coating equipment Download PDFInfo
- Publication number
- CN113514971B CN113514971B CN202110849580.1A CN202110849580A CN113514971B CN 113514971 B CN113514971 B CN 113514971B CN 202110849580 A CN202110849580 A CN 202110849580A CN 113514971 B CN113514971 B CN 113514971B
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- coating
- pdlc
- knife
- ultrasonic transducer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 136
- 239000011248 coating agent Substances 0.000 title claims abstract description 125
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 title claims abstract description 91
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 195
- 238000003848 UV Light-Curing Methods 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 238000004945 emulsification Methods 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 230000001804 emulsifying effect Effects 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000001723 curing Methods 0.000 abstract description 6
- 230000001678 irradiating effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 11
- 239000000839 emulsion Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
-
- 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
-
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1341—Filling or closing of cells
Abstract
The invention relates to a PDLC coating method and a coating device, wherein the coating method comprises the steps of (1) mixing liquid crystal and photosensitive resin to obtain PDLC; (2) Deep emulsifying PDLC by ultrasonic wave to reduce the size of liquid crystal micro-droplets; (3) Coating PDLC after deep emulsification on a substrate immediately to form a PDLC coating; (4) curing the PDLC coating by immediately irradiating UV light. The coating equipment comprises a coating knife, a base body, a UV curing lamp and an ultrasonic transducer, wherein the coating knife is arranged on the base body, the knife edge of the coating knife faces downwards, a liquid crystal buffer cavity and a diversion channel are arranged in the coating knife, and the diversion channel is arranged between the liquid crystal buffer cavity and the knife edge of the coating knife; the ultrasonic transducer is arranged on the coating knife and corresponds to the position of the liquid crystal buffer cavity; a UV curing lamp is mounted on the base at the rear side of the coating blade. The invention can manufacture the liquid crystal layer with higher haze and lower thickness and reduce the driving voltage.
Description
Technical Field
The invention relates to the technical field of display, in particular to a PDLC coating method and a PDLC coating device.
Background
PDLC (polymer dispersed liquid crystal), also known as polymer dispersed liquid crystals, is a liquid crystal structure in which a fluid liquid crystal is dispersed within a solid polymer. The PDLC display (also called polymer dispersed liquid crystal display) made of PDLC can realize the conversion between transparent and turbid display states by controlling the light scattering of liquid crystal, and the PDLC display does not need to be pasted with a polaroid, and has simpler structure than a common liquid crystal display.
In the conventional PDLC display, the liquid crystal layer generally includes individual liquid crystal droplets completely enclosed by a polymer, and the polymer is a transparent photosensitive resin, so that in a back region of the display and an OFF state display region (such as a pixel or a pen segment) with zero (or lower) driving voltage, when liquid crystal molecules in the liquid crystal droplets contact with the polymer, the alignment (i.e., the alignment direction of the liquid crystal molecules) of the liquid crystal droplets is relatively random, therefore, the optical axis of the liquid crystal droplets consistent with the alignment of the liquid crystal molecules is very disordered, and the liquid crystal layer has scattering and reflecting effects on transmitted light to make the region appear as a turbid state (such as a milky turbid state); in the ON state display area where a sufficient voltage is applied, the optical axes of the liquid crystal droplets become uniform under the action of the electric field, and scattering and reflection of light by the liquid crystal layer can be effectively reduced or eliminated, so that the liquid crystal layer assumes a clear transparent state. From this, it is known that the Haze of the PDLC liquid crystal layer is related to the distribution of liquid crystal droplets, and in general, the Haze of the liquid crystal layer can be measured by the Haze (Haze) of the liquid crystal layer, and the Haze is in the range of 0 to 100%. When the liquid crystal micro-droplets in the liquid crystal layer are large and sparse, the scattering of light is weak, and the turbidity state is not obvious, so that the haze is low; and when the liquid crystal droplets in the liquid crystal layer are small and dense, they are strong in scattering of light, and they have a remarkable cloudiness, so that haze is high.
In general, when the polymer is uncured, the liquid crystal droplets of the PDLC are combined with each other to cause a gradual increase in size with time, and when the liquid crystal droplets are too small (< 2 μm), they are combined within a very short time (20 s) to make it difficult to maintain the dispersed state. In the conventional PDLC display, liquid crystal and photosensitive resin are generally mixed into uncured PDLC and then poured or coated to form a liquid crystal layer, and finally cured; the time required for this process is large (> 30 min), and the formed liquid crystal layer inevitably has the situation that the mutual merging size of the liquid crystal droplets gradually increases with time, so that the size of the liquid crystal droplets inside the liquid crystal layer is difficult to reduce; in the existing PDLC display, the droplet size of the liquid crystal in the liquid crystal layer is generally above 5 μm, and in order to achieve the required Haze state (Haze > 60%) of the PDLC display, the thickness of the liquid crystal layer is generally above 30 μm, which not only increases the consumption of the liquid crystal, but also makes the driving voltage of the PDLC display too high, reducing the practicality of such PDLC.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a coating method and a coating device of PDLC, which can manufacture a liquid crystal layer with higher haze and lower thickness and reduce driving voltage. The technical scheme adopted is as follows:
a method for coating PDLC, characterized by: the method comprises the following steps:
(1) Mixing the liquid crystal with the photosensitive resin to enable the liquid crystal and the photosensitive resin to be mutually dispersed, so as to obtain PDLC;
(2) Deep emulsifying the PDLC obtained in the step (1) by adopting ultrasonic waves, and reducing the size of liquid crystal droplets to enable the size of the liquid crystal droplets in the PDLC to be smaller than 1 mu m;
(3) Coating the PDLC obtained after deep emulsification in the step (2) on a substrate immediately to form a PDLC coating;
(4) And (3) immediately irradiating the PDLC coating obtained after the coating in the step (3) with UV light for curing, thereby locking the size of the liquid crystal microdroplets so that the liquid crystal microdroplets cannot be combined to obtain a required liquid crystal layer.
In the coating method, the liquid crystal and the photosensitive resin are initially mixed, so that the liquid crystal and the photosensitive resin are mutually dispersed to obtain the PDLC, and then the PDLC is deeply emulsified by adopting ultrasonic waves, so that the scattering property of the PDLC can be greatly improved, and the size of liquid crystal microdroplets is reduced; the PDLC obtained after deep emulsification is immediately coated on a substrate to form a PDLC coating; in the PDLC coating, the periphery of each liquid crystal droplet is wrapped with a photosensitive resin thin layer, and at the moment, UV light is immediately irradiated to solidify the photosensitive resin in the PDLC coating, so that each dispersed liquid crystal droplet is fixed in the solidified photosensitive resin thin layer, a required liquid crystal layer is obtained, the size of the liquid crystal droplet is locked, the liquid crystal droplets cannot be combined, and the haze of the liquid crystal layer is ensured. The liquid crystal layer manufactured by the coating method has higher haze and lower thickness, so that not only can the consumption of liquid crystal be reduced, but also the aim of reducing the driving voltage can be achieved, and the practicability of the PDLC is improved.
In a specific scheme, in the step (1), the liquid crystal is positive liquid crystal, and the positive liquid crystal and the photosensitive resin are mixed in a stirring manner according to a ratio of not less than 7:3.
In the preferred embodiment, in the step (2), ultrasonic waves emitted by the ultrasonic transducer are used to deeply emulsify the PDLC.
More preferably, in the step (2), the haze of the liquid crystal layer is increased by increasing the input power of the ultrasonic transducer. The haze of the liquid crystal layer is related to the input power of the ultrasonic transducer, and the effectiveness of deep emulsification is improved by increasing the input power of the ultrasonic transducer, so that the haze of the liquid crystal layer can be obviously improved.
In a preferred embodiment, in the step (4), the haze of the liquid crystal layer is increased by reducing a delay time of UV curing. The haze of the liquid crystal layer is related to the curing delay time of the UV curing lamp, and the longer the curing delay time is, the more liquid crystal droplets are combined, so that the haze of the liquid crystal layer is reduced, and therefore, the haze of the liquid crystal layer can be effectively improved by reducing the UV curing delay time.
The invention also provides a PDLC coating device, which comprises a coating knife and a base body, wherein the coating knife is arranged on the base body, and the edge of the coating knife is arranged downwards, and the PDLC coating device is characterized in that: the coating apparatus further comprises a UV curing lamp and at least one ultrasonic transducer; a liquid crystal buffer cavity and a flow guide channel which runs up and down are arranged in the coating knife, and the flow guide channel is arranged between the liquid crystal buffer cavity and the knife edge of the coating knife; the ultrasonic transducer is arranged on the coating knife and corresponds to the position of the liquid crystal buffer cavity; a UV curing lamp is mounted on the base at the rear side of the coating blade.
Typically, the ultrasonic direction of the ultrasonic transducer is perpendicular to the side wall of the liquid crystal buffer cavity.
Before coating, primarily mixing liquid crystal and photosensitive resin to ensure mutual dispersion of the liquid crystal and the photosensitive resin, and filling the mixed PDLC into a liquid crystal buffer cavity in a coating knife; the ultrasonic transducer generates ultrasonic waves in the liquid crystal buffer cavity, PDLC buffered in the liquid crystal buffer cavity is subjected to deep emulsification under the action of the ultrasonic waves, so that the scattering property of the PDLC can be greatly improved, and the size of liquid crystal microdroplets in the PDLC can be reduced (generally, the size of the liquid crystal microdroplets is smaller than 1 mu m). When coating, the substrate is placed under the knife edge of the coating knife, so that the base body and the substrate move relatively, namely, the coating knife, the ultrasonic transducer, the UV curing lamp and the substrate move relatively; in the relative motion process, PDLC in the liquid crystal buffer cavity flows out to the upper surface of the substrate through the flow guide channel, and PDLC is uniformly coated on the upper surface of the substrate through the cooperation between the knife edge of the coating knife and the upper surface of the substrate, so that a PDLC coating is formed; and then the PDLC coating is immediately irradiated by UV light emitted by a UV curing lamp at the rear side of the coating knife to be cured, the size of the liquid crystal microdroplets is locked, the liquid crystal microdroplets cannot be combined, the required liquid crystal layer is obtained, and the haze of the liquid crystal layer is ensured. The coating equipment can manufacture the liquid crystal layer with higher haze and lower thickness, can reduce the consumption of liquid crystal, can achieve the purpose of reducing the driving voltage, and has higher practicability.
In a preferred scheme, the coating knife is provided with at least one liquid crystal injection port, and the liquid crystal injection port is communicated with the liquid crystal buffer cavity. The PDLC obtained after mixing can be filled into the liquid crystal buffer cavity in the coating knife through the liquid crystal injection port.
In a preferred scheme, the coating equipment further comprises a front-back translation mechanism, and the base body is arranged on a power output end of the front-back translation mechanism. During operation, the front-back translation mechanism can drive the base body to translate backwards, the coating knife, the UV curing lamp and the ultrasonic transducer are driven to translate backwards together, and the coating knife, the UV curing lamp and the ultrasonic transducer move relative to the base plate, so that the coating is cured immediately after the coating is finished, the emulsion state is fixed, and the liquid crystal after deep emulsion can be prevented from being placed for a certain time and then the original state is recovered.
In a more preferred scheme, the fore-and-aft translation mechanism comprises a base, a horizontal guide rail and a translation air cylinder, wherein the horizontal guide rail is arranged on the base and is arranged along the fore-and-aft direction, the base is arranged on the horizontal guide rail and is in sliding fit with the horizontal guide rail, the cylinder body of the translation air cylinder is arranged on the base and is arranged along the fore-and-aft direction, and a piston rod of the translation air cylinder is connected with the base. When the horizontal guide rail is in operation, the piston rod of the translation cylinder stretches to drive the seat body to translate forwards or backwards for a certain distance along the horizontal guide rail.
In another more preferable scheme, the front-back translation mechanism comprises a base, a horizontal guide rail, a translation screw rod and a translation motor, wherein the horizontal guide rail is arranged on the base and is arranged along the front-back direction, the base is arranged on the horizontal guide rail and is in sliding fit with the horizontal guide rail, the translation screw rod is rotatably arranged on the base and is parallel to the horizontal guide rail, the translation motor is arranged on the base, and an output shaft of the translation motor is in transmission connection with the translation screw rod. When the horizontal guide rail is in operation, the translation motor drives the translation screw rod to rotate, and the base body is driven to translate forwards or backwards for a certain distance along the horizontal guide rail.
In a preferred scheme, a strip-shaped mounting groove which is recessed backwards and extends along the left-right direction is formed in the front side wall of the coating knife, and the strip-shaped mounting groove corresponds to the position of the liquid crystal buffer cavity; the number of the ultrasonic transducers is multiple, and each ultrasonic transducer is arranged in the strip-shaped mounting groove and is sequentially arranged from left to right. Therefore, the thickness of the side wall of the liquid crystal buffer cavity can be effectively reduced, the ultrasonic emulsification effect is improved, the ultrasonic waves emitted by each ultrasonic transducer are uniform, the consistency of the emulsification degree of liquid crystal at each position in the liquid crystal buffer cavity is improved, the deep emulsification effect of PDLC buffered in the liquid crystal buffer cavity is effectively improved, and the uniformity of the haze of each position of the liquid crystal layer is guaranteed.
In another preferred scheme, the number of the ultrasonic transducers is multiple, and the ultrasonic transducers are divided into a plurality of front ultrasonic transducers installed on the front side wall of the coating knife and a plurality of rear ultrasonic transducers installed on the rear side wall of the coating knife, and each front ultrasonic transducer and each rear ultrasonic transducer are sequentially staggered in the left-right direction. Therefore, the ultrasonic waves emitted by each ultrasonic transducer are more uniform, the consistency of the liquid crystal emulsification degree of each position of the coating knife is improved, the deep emulsification effect on the PDLC buffered in the liquid crystal buffer cavity is effectively improved, and the uniformity of the haze of each position of the liquid crystal layer is guaranteed.
More preferably, the front side wall of the coating knife is provided with a front strip-shaped mounting groove which is recessed backwards and extends along the left-right direction, the rear side wall of the coating knife is provided with a rear strip-shaped mounting groove which is recessed forwards and extends along the left-right direction, the front strip-shaped mounting groove and the rear strip-shaped mounting groove are corresponding to the positions of the liquid crystal buffer cavities, the front ultrasonic transducers are all mounted in the front strip-shaped mounting groove, and the rear ultrasonic transducers are all mounted in the rear strip-shaped mounting groove. Therefore, the thickness of the side wall of the liquid crystal buffer cavity can be effectively reduced, and the ultrasonic emulsification effect is improved.
In a preferred scheme, the inner side wall of the liquid crystal buffer cavity is provided with an uneven rough surface, and the rough surface corresponds to the probe position of the ultrasonic transducer. By adopting the structure, the wave front of the ultrasonic wave propagating in the liquid crystal is uneven, and the phase difference change exists in the direction vertical to the propagation direction of the ultrasonic wave, so that the PDLC in the liquid crystal buffer cavity is emulsified more fully, and the liquid crystal emulsification effect is further improved.
With sufficient power of the UV curing lamp and a sufficient light volume, the haze of the liquid crystal layer is inversely related to the cure delay time of the UV curing lamp for the PDLC coating. If the distance between the tool bit of the coating tool and the UV curing lamp is L and the translational speed of the coating tool is V, the curing delay time of the UV curing lamp to the PDLC coating is t=l/V, and the curing delay time of the UV curing lamp to the PDLC coating can be reduced by reducing L and/or increasing V, so as to further improve the haze of the liquid crystal layer.
In the PDLC coating method and the coating equipment, the liquid crystal and the photosensitive resin are firstly mixed preliminarily, the mutual dispersion of the liquid crystal and the photosensitive resin is ensured to obtain the PDLC, and then the PDLC is deeply emulsified by adopting ultrasonic waves, so that the scattering property of the PDLC can be greatly improved, and the size of liquid crystal microdroplets is reduced; the PDLC obtained after deep emulsification is immediately coated on a substrate to form a PDLC coating; in the PDLC coating, the periphery of each liquid crystal droplet is wrapped with a photosensitive resin thin layer, and at the moment, UV light is immediately irradiated to solidify the photosensitive resin in the PDLC coating, so that each dispersed liquid crystal droplet is fixed in the solidified photosensitive resin thin layer, a required liquid crystal layer is obtained, the size of the liquid crystal droplet is locked, the liquid crystal droplets cannot be combined, the haze of the liquid crystal layer is ensured, the thickness of the liquid crystal layer is reduced, the driving voltage is reduced, and the practicability of the PDLC is improved.
Drawings
Fig. 1 is a schematic view of the structure of a first embodiment of the preferred embodiment of the present invention.
Fig. 2 is a perspective view of fig. 1.
Fig. 3 is a schematic structural view of a second embodiment of the present invention.
Fig. 4 is a schematic structural view of a third embodiment of the present invention.
Detailed Description
Example 1
The PDLC coating method comprises the following steps:
(1) Mixing the liquid crystal with the photosensitive resin to enable the liquid crystal and the photosensitive resin to be mutually dispersed to obtain PDLC10;
(2) Deep emulsifying the PDLC10 obtained in the step (1) by adopting ultrasonic waves, and reducing the size of liquid crystal droplets to enable the size of the liquid crystal droplets in the PDLC10 to be smaller than 1 mu m;
(3) Immediately coating the PDLC10 obtained after deep emulsification in the step (2) on the substrate 6 to form a PDLC coating 20;
(4) The PDLC coating 20 obtained after the coating of step (3) is immediately cured by irradiation with UV light, thereby locking the size of the liquid crystal droplets so that they do not merge, resulting in the desired liquid crystal layer 30.
In this embodiment, in the step (1), the liquid crystal is a positive liquid crystal, and the liquid crystal and the photosensitive resin are mixed by stirring according to a ratio of 7:3.
In this embodiment, in the step (2), the PDLC10 is deeply emulsified with the ultrasonic waves emitted from the ultrasonic transducer 4; the haze of the liquid crystal layer 30 is increased by increasing the input power of the ultrasonic transducer 4. The haze of the liquid crystal layer 30 is related to the input power of the ultrasonic transducer 4, and by increasing the input power of the ultrasonic transducer 4, the effectiveness of deep emulsification is improved, and thus the haze of the liquid crystal layer 30 can be significantly improved.
In the present embodiment, in the step (4), the haze of the liquid crystal layer 30 is increased by reducing the delay time of UV curing. The haze of the liquid crystal layer 30 is related to the cure delay time of the UV curing lamp 3, and the longer the cure delay time, the more liquid crystal droplets are combined, resulting in a decrease in the haze of the liquid crystal layer 30, and thus, reducing the delay time of UV curing can effectively improve the haze of the liquid crystal layer 30.
As shown in fig. 1 and 2, the present embodiment further provides a coating apparatus for PDLC, which includes a coating knife 1, a base 2, a UV curing lamp 3, and at least one ultrasonic transducer 4; the coating knife 1 is arranged on the seat body 2, the knife edge of the coating knife 1 is arranged downwards, a liquid crystal buffer cavity 101 and a flow guide channel 102 which runs up and down are arranged in the coating knife 1, and the flow guide channel 102 is arranged between the liquid crystal buffer cavity 101 and the knife edge of the coating knife 1; the ultrasonic transducer 4 is arranged on the coating knife 1 and corresponds to the position of the liquid crystal buffer cavity 101, and the ultrasonic direction of the ultrasonic transducer 4 is vertical to the side wall of the liquid crystal buffer cavity 101; the UV curing lamp 3 is mounted on the base body 2 at the rear side of the coating blade 1.
In this embodiment, the coating knife 1 is provided with a plurality of liquid crystal injection ports 103, and each liquid crystal injection port 103 communicates with the liquid crystal buffer chamber 101.
The coating apparatus of the present embodiment further includes a front-rear translation mechanism 5, the front-rear translation mechanism 5 including a housing (not shown in the drawing), a horizontal rail 51 mounted on the housing and disposed in the front-rear direction, and a translation cylinder (not shown in the drawing) mounted on the horizontal rail and slidably fitted with the horizontal rail, a cylinder body of the translation cylinder being mounted on the housing and disposed in the front-rear direction, a piston rod of the translation cylinder being connected to the housing 2. During operation, the base body 2 can be driven to translate backwards along the horizontal guide rail through the translation cylinder, the coating knife 1, the UV curing lamp 3 and the ultrasonic transducer 4 are driven to translate backwards together, and move relative to the base plate 6, so that the emulsion state is fixed immediately after coating is finished, and the PDLC10 after deep emulsion can be prevented from being placed for a certain time and then the original state is restored.
In the present embodiment, a strip-shaped mounting groove 104 recessed rearward and extending in the left-right direction is provided on the front side wall of the coating blade 1, the strip-shaped mounting groove corresponding to the position of the liquid crystal buffer chamber 101; the number of the ultrasonic transducers 4 is plural, and each ultrasonic transducer 4 is mounted in a strip-shaped mounting groove and arranged in order from left to right. In this way, the thickness of the side wall of the liquid crystal buffer cavity 101 can be effectively reduced, the ultrasonic emulsification effect is improved, the ultrasonic waves emitted by each ultrasonic transducer 4 can be more uniform, the consistency of the liquid crystal emulsification degree of each position of the coating knife 1 is improved, the deep emulsification effect on the PDLC10 buffered in the liquid crystal buffer cavity 101 is effectively improved, and the uniformity of the haze of each position of the liquid crystal layer 30 is favorably ensured.
The working principle of the coating device is briefly described below:
before coating, primarily mixing liquid crystal and photosensitive resin to ensure mutual dispersion of the liquid crystal and the photosensitive resin, and filling the PDLC10 obtained after mixing into a liquid crystal buffer cavity 101 in a coating knife 1 through a liquid crystal injection opening 103; the ultrasonic transducer 4 generates ultrasonic waves in the liquid crystal buffer cavity 101, and the PDLC10 buffered in the liquid crystal buffer cavity 101 is deeply emulsified under the action of the ultrasonic waves, so that the scattering property of the PDLC10 can be greatly improved, and the size of liquid crystal droplets in the PDLC10 can be reduced (generally, the size of the liquid crystal droplets can be smaller than 1 μm). When coating is carried out, the substrate 6 is placed under the knife edge of the coating knife 1, and the translation cylinder drives the seat body 2 to translate backwards along the horizontal guide rail, so that the coating knife 1, the ultrasonic transducer 4, the UV curing lamp 3 and the substrate 6 move relatively; in the relative motion process, the PDLC10 in the liquid crystal buffer cavity 101 flows out to the upper surface of the substrate 6 through the diversion channel 102, and the PDLC10 is uniformly coated on the upper surface of the substrate 6 through the cooperation between the knife edge of the coating knife 1 and the upper surface of the substrate 6, so as to form a PDLC coating 20; the PDLC coating 20 is immediately irradiated with UV light from the UV curing lamp 3 at the rear side of the coating knife 1 to be cured, thereby locking the size of the liquid crystal droplets, preventing the liquid crystal droplets from being combined, obtaining the desired liquid crystal layer 30, and ensuring the haze of the liquid crystal layer 30.
Example two
Referring to fig. 3, in the case where the other portions are the same as in the first embodiment, the difference is that: in the present embodiment, a front strip-shaped mounting groove 104 recessed rearward and extending in the left-right direction is provided on the front side wall of the coating blade 1, and a rear strip-shaped mounting groove 105 recessed forward and extending in the left-right direction is provided on the rear side wall of the coating blade 1, the front strip-shaped mounting groove 104, the rear strip-shaped mounting groove 105 each corresponding to the position of the liquid crystal buffer chamber 101; the number of the ultrasonic transducers 4 is plural, and is divided into a plurality of front ultrasonic transducers 41 and a plurality of rear ultrasonic transducers 42, each front ultrasonic transducer 41 is mounted in the front strip-shaped mounting groove 104, each rear ultrasonic transducer 42 is mounted in the rear strip-shaped mounting groove 105, and each front ultrasonic transducer 41 and each rear ultrasonic transducer 42 are sequentially staggered in the left-right direction. In this way, the thickness of the side wall of the liquid crystal buffer cavity 101 can be effectively reduced, the ultrasonic emulsification effect is improved, the ultrasonic waves emitted by each ultrasonic transducer can be more uniform, the consistency of the liquid crystal emulsification degree of each position of the coating knife 1 is improved, the deep emulsification effect on the PDLC10 buffered in the liquid crystal buffer cavity 101 is effectively improved, and the uniformity of the haze of each position of the liquid crystal layer 30 is favorably ensured.
Example III
Referring to fig. 4, in the case where the other portions are the same as in the first embodiment, the difference is that: in the present embodiment, the inner side wall of the liquid crystal buffer chamber 101 has an uneven rough surface 1011, and the rough surface 1011 corresponds to the probe position of the ultrasonic transducer 4. With this structure, the wave front of the ultrasonic wave propagating in the liquid crystal is uneven, and the phase difference changes in the direction perpendicular to the propagation direction of the ultrasonic wave, so that the emulsion of the PDLC10 in the liquid crystal buffer cavity 101 is more sufficient, and the liquid crystal emulsion effect is further increased.
In addition, it should be noted that, in the specific embodiments described in the present specification, names of various parts and the like may be different, and all equivalent or simple changes of the structures, features and principles described in the conception of the present invention are included in the protection scope of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (9)
1. A method for coating PDLC, characterized by: the method comprises the following steps:
(1) Mixing the liquid crystal with the photosensitive resin to enable the liquid crystal and the photosensitive resin to be mutually dispersed, so as to obtain PDLC;
(2) Deep emulsifying the PDLC obtained in the step (1) by adopting an ultrasonic transducer, reducing the size of liquid crystal droplets, enabling the size of the liquid crystal droplets in the PDLC to be smaller than 1 mu m, and improving the haze of a liquid crystal layer by increasing the input power of the ultrasonic transducer;
(3) Coating the PDLC obtained after deep emulsification in the step (2) on a substrate immediately to form a PDLC coating;
(4) The PDLC coating obtained after the coating of step (3) is immediately cured by irradiation with UV light, thereby locking the size of the liquid crystal droplets so that they do not merge, resulting in a desired liquid crystal layer.
2. The method for coating a PDLC of claim 1, wherein: in the step (1), the liquid crystal is positive liquid crystal, and the positive liquid crystal and the photosensitive resin are mixed in a stirring mode according to a ratio of not less than 7:3.
3. The method for coating a PDLC of claim 1, wherein: in the step (4), the haze of the liquid crystal layer is increased by reducing the delay time of UV curing.
4. A method of coating a PDLC according to any of claims 1-3, wherein: the coating method of the PDLC adopts the following coating equipment to finish the manufacture of the liquid crystal layer; the coating equipment comprises a coating knife and a base body, wherein the coating knife is arranged on the base body, the knife edge of the coating knife is arranged downwards, and the coating equipment further comprises a UV curing lamp and at least one ultrasonic transducer; a liquid crystal buffer cavity and a flow guide channel which runs up and down are arranged in the coating knife, and the flow guide channel is arranged between the liquid crystal buffer cavity and the knife edge of the coating knife; the ultrasonic transducer is arranged on the coating knife and corresponds to the position of the liquid crystal buffer cavity; a UV curing lamp is mounted on the base at the rear side of the coating blade.
5. The method for coating a PDLC of claim 4, wherein: the coating knife is provided with at least one liquid crystal injection opening, and the liquid crystal injection opening is communicated with the liquid crystal buffer cavity.
6. The method for coating a PDLC of claim 4, wherein: the coating equipment further comprises a front-back translation mechanism, and the base body is arranged on the power output end of the front-back translation mechanism.
7. The method for coating a PDLC of claim 4, wherein: a strip-shaped mounting groove which is recessed backwards and extends along the left-right direction is formed in the front side wall of the coating knife, and the strip-shaped mounting groove corresponds to the position of the liquid crystal buffer cavity; the number of the ultrasonic transducers is multiple, and each ultrasonic transducer is arranged in the strip-shaped mounting groove and is sequentially arranged from left to right.
8. The method for coating a PDLC of claim 4, wherein: the front side wall of the coating knife is provided with a front strip-shaped mounting groove which is recessed backwards and extends along the left-right direction, the rear side wall of the coating knife is provided with a rear strip-shaped mounting groove which is recessed forwards and extends along the left-right direction, and the front strip-shaped mounting groove and the rear strip-shaped mounting groove are both corresponding to the positions of the liquid crystal buffer cavity; the number of the ultrasonic transducers is multiple, the ultrasonic transducers are divided into a plurality of front ultrasonic transducers and a plurality of rear ultrasonic transducers, each front ultrasonic transducer is arranged in the front strip-shaped mounting groove, each rear ultrasonic transducer is arranged in the rear strip-shaped mounting groove, and each front ultrasonic transducer and each rear ultrasonic transducer are sequentially staggered in the left-right direction.
9. The method for coating a PDLC of claim 4, wherein: the inner side wall of the liquid crystal buffer cavity is provided with an uneven rough surface, and the rough surface corresponds to the probe position of the ultrasonic transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110849580.1A CN113514971B (en) | 2021-07-27 | 2021-07-27 | PDLC coating method and coating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110849580.1A CN113514971B (en) | 2021-07-27 | 2021-07-27 | PDLC coating method and coating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113514971A CN113514971A (en) | 2021-10-19 |
| CN113514971B true CN113514971B (en) | 2024-04-09 |
Family
ID=78068581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110849580.1A Active CN113514971B (en) | 2021-07-27 | 2021-07-27 | PDLC coating method and coating equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113514971B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200710A (en) * | 2021-12-07 | 2022-03-18 | 武汉华星光电技术有限公司 | Display panel, manufacturing method thereof and display device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07234397A (en) * | 1994-02-23 | 1995-09-05 | Hitachi Cable Ltd | Polymer dispersion type liquid crystal element |
| JPH08194211A (en) * | 1995-01-19 | 1996-07-30 | Hitachi Cable Ltd | Liquid crystal display element |
| JP2002014355A (en) * | 2001-06-29 | 2002-01-18 | Matsushita Electric Ind Co Ltd | Method and device for manufacturing liquid crystal display element |
| US6423368B1 (en) * | 2000-01-06 | 2002-07-23 | Eastman Kodak Company | Method for making materials having uniform limited coalescence domains |
| KR20060079069A (en) * | 2004-12-31 | 2006-07-05 | 엘지.필립스 엘시디 주식회사 | Liquid crystal dispensing apparatus |
| KR20110074349A (en) * | 2009-12-24 | 2011-06-30 | 엘지디스플레이 주식회사 | Liquid crystal spray device for liquid crystal display device and liquid crystal layer formative method using thereof |
| CN102207632A (en) * | 2011-07-06 | 2011-10-05 | 上海理工大学 | Stereoscopic display |
| CN102608688A (en) * | 2012-04-06 | 2012-07-25 | 上海理工大学 | Electronic-control high-efficiency holographic grating made of polymer dispersed liquid crystal materials doped with nano metal and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6552762B1 (en) * | 2000-01-06 | 2003-04-22 | Eastman Kodak Company | Light-modulating, electrically responsive privacy screen |
-
2021
- 2021-07-27 CN CN202110849580.1A patent/CN113514971B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07234397A (en) * | 1994-02-23 | 1995-09-05 | Hitachi Cable Ltd | Polymer dispersion type liquid crystal element |
| JPH08194211A (en) * | 1995-01-19 | 1996-07-30 | Hitachi Cable Ltd | Liquid crystal display element |
| US6423368B1 (en) * | 2000-01-06 | 2002-07-23 | Eastman Kodak Company | Method for making materials having uniform limited coalescence domains |
| JP2002014355A (en) * | 2001-06-29 | 2002-01-18 | Matsushita Electric Ind Co Ltd | Method and device for manufacturing liquid crystal display element |
| KR20060079069A (en) * | 2004-12-31 | 2006-07-05 | 엘지.필립스 엘시디 주식회사 | Liquid crystal dispensing apparatus |
| KR20110074349A (en) * | 2009-12-24 | 2011-06-30 | 엘지디스플레이 주식회사 | Liquid crystal spray device for liquid crystal display device and liquid crystal layer formative method using thereof |
| CN102207632A (en) * | 2011-07-06 | 2011-10-05 | 上海理工大学 | Stereoscopic display |
| CN102608688A (en) * | 2012-04-06 | 2012-07-25 | 上海理工大学 | Electronic-control high-efficiency holographic grating made of polymer dispersed liquid crystal materials doped with nano metal and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113514971A (en) | 2021-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113514971B (en) | PDLC coating method and coating equipment | |
| US10953603B2 (en) | Methods, systems, and computer program products for determining orientation and fabrication parameters used in three-dimensional (3D) continuous liquid interface printing (CLIP) systems, and related printers | |
| US9341887B2 (en) | Displays with a backlight incorporating reflecting layer | |
| KR100972845B1 (en) | Light guiding plate, inc for manufacturing light guiding plate, and manufacturing method of light guiding plate using inkjet printing | |
| CN102914898B (en) | PDLC film structure as well as preparation and use method thereof | |
| EP2450726A1 (en) | Optical guide for a motor vehicle | |
| EP0939695A1 (en) | Optical forming apparatus for forming three-dimensional objects | |
| KR20150135317A (en) | Coating device | |
| JP5253461B2 (en) | Display device | |
| CN1764866A (en) | Light adjuster and laminated glass | |
| CN102230977A (en) | LCD light guide panel and moulding technology thereof | |
| JP4888257B2 (en) | 3D modeling apparatus and 3D modeling method | |
| WO2010023851A1 (en) | Reflection type liquid crystal display device | |
| EP1486800B1 (en) | Non-birefringent optical resin material and its producing method | |
| Böttger et al. | Improved transmission characteristics of moderate refractive index contrast photonic crystal slabs | |
| CN213226728U (en) | Ceramic additive manufacturing equipment based on photocuring forming | |
| DE102018211996A1 (en) | Air flap device with integrated light guides for a motor vehicle | |
| US9557609B2 (en) | Method for manufacturing polymer dispersed liquid crystal (PDLC) panel | |
| CN208020738U (en) | Stereolithography device | |
| CN101059568A (en) | Production method of light scattering light conducting board and the light conducting board produced therefrom | |
| CN205484890U (en) | Light guide plate, backlight module and liquid crystal display device | |
| CN1898601A (en) | Liquid crystal screen | |
| CN113025307B (en) | Preparation method of quantum dot fluorescence enhancement film based on titanium dioxide/liquid crystal/polymer composite material | |
| JP3414727B2 (en) | Light scattering light guide and light scattering light source device | |
| JPH06186560A (en) | Light scattering transmission body and light scattering transmission light source device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |