A graphic display dimming film and preparation method thereof

Abstract

The present invention relates to a graphic display dimming film and a preparation method thereof, wherein the graphic display dimming film comprises a first conductive film, a polymer dispersed liquid crystal layer and a second conductive film sequentially stacked along a first direction, wherein the polymer dispersed liquid crystal layer comprises liquid crystal droplets separated by a polymer, and wherein the polymer dispersed liquid crystal layer comprises a first region and a second region in a plane direction perpendicular to the first direction, wherein the size of the liquid crystal droplets in the first region is smaller than that of the liquid crystal droplets in the second region, and the driving voltage of the first region is higher than that of the second region. The graphic display dimming film does not leave etching marks, and can be switched between different states such as fully frosted, partially frosted and fully transparent, providing richer graphic display and dimming functions.

Description

Technical Field

[0001] The present invention relates to the technical field of dimming films, and in particular to a graphic display dimming film and a preparation method thereof. Background Art

[0002] Polymer dispersed liquid crystal dimming film (PDLC film) is mainly composed of two layers of transparent conductive film and a polymer dispersed liquid crystal layer located between the two conductive films. Conventional dimming film has two complete conductive layers on both sides, and can only achieve the conversion between the whole frosted surface and the whole transparent surface. To achieve graphical display, there are currently two solutions:

[0003] (1) During the preparation of the conductive film, the conductive layer is etched in sections by chemical etching or laser etching, and then laminated with another conductive layer to form a dimming film.

[0004] (2) During the preparation of the dimming film, the internal conductive layer is etched in sections by laser engraving.

[0005] For the graphic / partitioned dimming films prepared by the above two schemes, if the pattern near the middle area is designed to have a conductive electrode connected to the edge of the dimming film, the pattern can be switched on and off through multiple partitioned electrodes, but the etching lines are obvious, affecting the visual experience; if the internal pattern is not designed to be connected to the electrode at the edge of the dimming film, the pattern area cannot be switched on and off and will always be in a frosted state. Summary of the invention

[0006] If the graphical display of the dimming film can be achieved without leaving etching marks, it will greatly promote the application of the dimming film in this field.

[0007] In view of the shortcomings of the prior art, the first object of the present invention is to provide a graphical display dimming film, which does not leave etching marks and can be switched between different states such as fully frosted, partially frosted and fully transparent, providing richer dimming functions.

[0008] The second objective of the present invention is to provide a method for preparing the graphic display dimming film, which has simple steps.

[0009] To achieve the first objective of the present invention, the present invention provides a graphical display dimming film, comprising a first conductive film, a polymer dispersed liquid crystal layer, and a second conductive film stacked in sequence along a first direction, the polymer dispersed liquid crystal layer comprising liquid crystal droplets separated by a polymer, the polymer dispersed liquid crystal layer comprising a first region and a second region in a planar direction perpendicular to the first direction, the size of the liquid crystal droplets in the first region being smaller than the size of the liquid crystal droplets in the second region, and the driving voltage of the first region being higher than the driving voltage of the second region.

[0010] In some embodiments of the present invention, the driving voltage of the first region is 20V to 25V, and the driving voltage of the second region is 8V to 10V.

[0011] In some embodiments of the present invention, a driving voltage of the first region differs from a driving voltage of the second region by more than 10V.

[0012] In some embodiments of the present invention, the first conductive film and the second conductive film are transparent conductive films.

[0013] In some embodiments of the present invention, the second area is surrounded by the first area, and the first area is a preset pattern.

[0014] In some embodiments of the present invention, based on the working voltage being greater than or equal to the driving voltage of the first area, the graphical display dimming film is in a transparent state as a whole; based on the working voltage being greater than or equal to the driving voltage of the second area and less than the driving voltage of the first area, the first area is in a frosted state and the second area is in a transparent state; based on the working voltage being less than the driving voltage of the second area, the graphical display dimming film is in a frosted state as a whole.

[0015] In some embodiments of the present invention, the polymer dispersed liquid crystal layer is made of a photocurable resin-liquid crystal mixture with a viscosity of 1500cps to 2500cps, the photocurable resin-liquid crystal mixture is polymerized under a first UV light intensity to obtain a first region, and the photocurable resin-liquid crystal mixture is polymerized under a second UV light intensity to obtain a second region, and the first UV light intensity is greater than the second UV light intensity.

[0016] In some embodiments of the present invention, the polymer dispersed liquid crystal layer is made of a photocurable resin-liquid crystal mixture, and the photocurable resin component in the photocurable resin-liquid crystal mixture contains 25% to 40% by mass of acrylate oligomers.

[0017] To achieve the second object of the present invention, the present invention provides a method for preparing a graphic display dimming film, which comprises the following steps:

[0018] Step 1: preparing a stacked structure in which a photocurable resin-liquid crystal mixture is sandwiched between a first conductive film and a second conductive film;

[0019] Step 2: Apply UV radiation of a first UV intensity to the first area of ​​the photocurable resin-liquid crystal mixture, and apply UV radiation of a second UV intensity to the second area of ​​the photocurable resin-liquid crystal mixture to obtain a graphic display dimming film.

[0020] In some embodiments of the present invention, the viscosity of the photocurable resin-liquid crystal mixture is 1500 cps to 2500 cps, or the photocurable resin component in the photocurable resin-liquid crystal mixture contains 25 mass % to 40 mass % of acrylate oligomers.

[0021] In some embodiments of the present invention, the temperature of the photocurable resin-liquid crystal mixture is controlled so that the viscosity of the photocurable resin-liquid crystal mixture is 1500cps-2500cps during UV irradiation.

[0022] In some embodiments of the present invention, a UV dot matrix light source with a control accuracy of 2 mm provides UV radiation with different UV light intensities to the first area and the second area.

[0023] In some embodiments of the present invention, a mask for limiting UV transmittance is disposed in the second region, or masks with different UV transmittances are disposed in the first region and the second region, and then a UV light source is used to irradiate the photocurable resin-liquid crystal mixture.

[0024] In some embodiments of the present invention, in step 2, the first UV light intensity is greater than the second UV light intensity, and the first UV light intensity is 15 mW / cm 2 ~25mW / cm 2 The second UV light intensity is 3mW / cm 2 ~10mW / cm 2 .

[0025] In some embodiments of the present invention, before step one, a first conductive film, a second conductive film and a photocurable resin-liquid crystal mixture are prepared, the photocurable resin-liquid crystal mixture is applied to the first conductive film, and the second conductive film is covered on the photocurable resin-liquid crystal mixture.

[0026] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0027] The present invention controls the size of liquid crystal droplets inside the dimming film in different regions, and affects the driving voltage of the dimming film through the difference in the size of the liquid crystal droplets, thereby obtaining a dimming film with different local driving voltages. The dimming film is divided into at least a first region and a second region, corresponding to a first driving voltage and a second driving voltage respectively. When the working voltage is switched between less than two driving voltages, between two driving voltages, or greater than two driving voltages, the dimming film can switch between overall transparent, partially transparent / partially frosted, or overall frosted states, and can choose to display or not display graphics, thereby realizing richer dimming functions. Moreover, the polymer dispersed liquid crystal layer is formed by the polymerization of the same photocurable resin-liquid crystal mixture, and there will be no obvious boundary between the first region and the second region, and there will be no traces like etching lines in the overall transparent state. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of an embodiment of the dimming film of the present invention.

[0029] Figure 2 It is a schematic diagram of the dimming film embodiment 1 of the present invention in a transparent state.

[0030] Figure 3 It is a schematic diagram of comparative example 1 of the dimming film of the present invention in a transparent state.

[0031] Figure 4 It is a schematic diagram of comparative example 2 in a transparent state.

[0032] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation modes. DETAILED DESCRIPTION

[0033] The embodiment of the present invention provides a graphic display dimming film, such as Figure 1 As shown, it includes a first conductive film 10, a polymer dispersed liquid crystal layer 20, and a second conductive film 30 stacked in sequence along a first direction, and the first direction is the stacking direction of the first conductive film 10, the polymer dispersed liquid crystal layer 20, and the second conductive film 30. The polymer dispersed liquid crystal layer 20 contains liquid crystal droplets separated by polymers, and the polymer dispersed liquid crystal layer 20 includes a first region A and a second region B in a plane direction perpendicular to the first direction, and the plane direction is the direction in which the polymer dispersed liquid crystal layer 20 is laid. The size of the liquid crystal droplets in the first region A is smaller than that of the liquid crystal droplets in the second region B, and the driving voltage of the first region A is higher than that of the second region B. The size of the liquid crystal droplets in the first region A is small, the interaction force between the liquid crystal droplets and the polymer surface is large, and the surface anchoring energy is large, so the first region A requires a higher driving voltage to make the liquid crystal molecules move and align.

[0034] This embodiment controls the size of liquid crystal droplets inside the dimming film in different regions, and affects the driving voltage of the dimming film through the difference in the size of the liquid crystal droplets, so as to obtain a dimming film with different local driving voltages. The dimming film is divided into at least a first region A and a second region B, corresponding to a first driving voltage UA and a second driving voltage UB respectively. When the working voltage is switched between less than two driving voltages, between two driving voltages, or greater than two driving voltages, the dimming film can switch between the state of overall transparency, partial transparency / partial frosting, or overall frosting, and can choose to display or not display graphics, realizing richer dimming functions. Moreover, the polymer dispersed liquid crystal layer 20 is formed by the polymerization of the same photocurable resin-liquid crystal mixture, and there will be no obvious boundary between the first region A and the second region B, and there will be no traces like etching lines in the overall transparent state.

[0035] In some examples, the polymer dispersed liquid crystal layer 20 may include a third region in addition to the first region A and the second region B. The liquid crystal droplets in different regions have different sizes and corresponding driving voltages, thereby achieving more graphic displays and richer dimming functions.

[0036] In some examples, the driving voltage of the first region A is 20V to 25V, for example, 20V, 21V, 22V, 23V, 24V, 25V, etc. The driving voltage of the second region B is 8V to 10V, for example, 8V, 9V, 10V, etc. The first region A and the second region B can both be driven at a lower voltage, and the driving voltage difference between the first region A and the second region B is more than 10V, so that the operating voltage is adjusted between the driving voltage of the first region A and the driving voltage of the second region B to achieve the effect of partial transparency and partial frosting.

[0037] In some examples, the first conductive film 10 and the second conductive film 30 are transparent conductive films, such as ITO conductive films, which do not affect the light transmittance of the dimming film.

[0038] In some examples, the second area B surrounds the first area A, and the first area A is a preset pattern. When the operating voltage is between the driving voltage of the first area A and the driving voltage of the second area B, the pattern of the first area A can present a transparent or frosted effect different from that of the second area B, thereby displaying the pattern.

[0039] In some examples, based on the operating voltage being greater than or equal to the driving voltage of the first region A, the graphical display dimming film is in a transparent state as a whole, there is no trace of etching line between the first region A and the second region B, and the first region A and the second region B are almost connected as a transparent state. Based on the operating voltage being greater than or equal to the driving voltage of the second region B and less than the driving voltage of the first region A, the first region A is in a frosted state and the second region B is in a transparent state, so that the pattern of the first region A can be displayed in a frosted form. Based on the operating voltage being less than the driving voltage of the second region B, the graphical display dimming film is in a frosted state as a whole, and the dimming film can well block light. The operating voltage refers to the voltage applied to the first conductive film 10 and the second conductive film 30. By selecting a suitable existing liquid crystal material, the liquid crystal material can be oriented and arranged when the first conductive film 10 and the second conductive film 30 are powered on, so as to transmit light, and when the first conductive film 10 and the second conductive film 30 are powered off, they are disorderly distributed so as to block light. In other examples, by selecting a suitable existing liquid crystal material or setting an orientation agent on the conductive film, the liquid crystal material can be oriented and arranged to transmit light when the first conductive film 10 and the second conductive film 30 are powered off, and the liquid crystal molecules fall down to block light when the first conductive film 10 and the second conductive film 30 are powered on, thereby achieving a light-transmitting and frosted effect opposite to the above.

[0040] In some examples, the polymer dispersed liquid crystal layer is made of a photocurable resin-liquid crystal mixture with a viscosity of 1500cps to 2500cps. The photocurable resin-liquid crystal mixture is polymerized under a first UV light intensity to obtain a first region, and the photocurable resin-liquid crystal mixture is polymerized under a second UV light intensity to obtain a second region, and the first UV light intensity is greater than the second UV light intensity. When the UV light intensity is high, the photocurable resin is polymerized when the degree of phase separation from the liquid crystal is low, and the size of the resulting liquid crystal droplets is relatively small. When the viscosity of the photocurable resin-liquid crystal mixture is 1500cps to 2500cps, light-transmitting lines caused by the rapid precipitation and transfer of liquid crystals are avoided at the junction of regions with different UV light intensities.

[0041] In some examples, the photocurable resin component in the photocurable resin-liquid crystal mixture contains 25% to 40% by mass of acrylate oligomers. The molecular weight of acrylate oligomers is larger than that of acrylate monomers, and the molecular force between the main chain structures is stronger, which helps to improve the viscosity of the photocurable resin-liquid crystal mixture. When the amount of acrylate oligomers is 25% to 40% by mass, the photocurable resin-liquid crystal mixture can be better coated and the light-transmitting lines caused by the rapid precipitation and transfer of liquid crystals at the junction of areas with different UV light intensities can be avoided. The amount of acrylate oligomers can be, for example, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, etc. The photocurable resin component may also contain other UV-polymerizable monomers such as NOA65 glue, polyethylene glycol diacrylate, dipentaerythritol hexaacrylate, isobornyl methacrylate, hydroxyethyl acrylate, trimethylolpropane triacrylate, 2-phenoxyethyl acrylate, etc. Preferably, the amount of other UV-polymerizable monomers is 50% to 70% by mass, and other UV-polymerizable monomers may be a mixture of monofunctional acrylate and multifunctional acrylate. The photocurable resin component may also contain photoinitiators and other auxiliary agents, and the amount of photoinitiators and other auxiliary agents may be 1% to 5% by mass, respectively. The photocurable resin-liquid crystal mixture also contains a liquid crystal component, and the mass ratio of the photocurable resin component to the liquid crystal component may be 1: (0.5 to 2).

[0042] The embodiment of the present invention also provides a method for preparing the above-mentioned graphic display dimming film, which includes the following steps: Step 1: preparing a stacked structure of a photocurable resin-liquid crystal mixture sandwiched between a first conductive film and a second conductive film; Step 2: applying UV radiation of a first UV light intensity to the first region A of the photocurable resin-liquid crystal mixture, and applying UV radiation of a second UV light intensity to the second region B of the photocurable resin-liquid crystal mixture, to obtain a graphic display dimming film. The preparation method of the dimming film has simple steps, low production cost, and is suitable for large-scale production. The patterned display of the dimming film is achieved by controlling the curing process without adding additional processes.

[0043] In some examples, the temperature of the photocurable resin-liquid crystal mixture is controlled so that the viscosity of the photocurable resin-liquid crystal mixture is 1500cps to 2500cps during UV irradiation. Since UV irradiation does not require heating of the photocurable resin-liquid crystal mixture, the temperature of the photocurable resin-liquid crystal mixture can be adjusted according to actual needs to obtain the desired viscosity. Of course, the amount of each component in the photocurable resin-liquid crystal mixture can also be adjusted, for example, by using a suitable amount of acrylate oligomers, so that the photocurable resin-liquid crystal mixture meets the above-mentioned viscosity condition range at room temperature, and there is no need to adjust the temperature of the photocurable resin-liquid crystal mixture.

[0044] In some examples, applying UV radiation of a first UV intensity to the first region A of the photocurable resin-liquid crystal mixture and applying UV radiation of a second UV intensity to the second region B of the photocurable resin-liquid crystal mixture can be performed simultaneously. In other examples, applying UV radiation of a first UV intensity to the first region A of the photocurable resin-liquid crystal mixture and applying UV radiation of a second UV intensity to the second region B of the photocurable resin-liquid crystal mixture can be performed in any order.

[0045] In some examples, a UV dot matrix light source with a control accuracy of 2 mm provides UV irradiation with different UV light intensities to the first area and the second area. The UV lamp beads of the UV dot matrix light source are arranged in a dot matrix, and different light intensities can be achieved by controlling the power of the lamp beads in different areas of the dot matrix. The control accuracy of the UV dot matrix light source reaches 2 mm, and the area of ​​UV irradiation can be accurately controlled.

[0046] In some examples, a mask that limits UV transmittance is set in the second region B, and no mask is set in the first region A. When irradiated with a UV light source, the light intensity of the second region B is reduced. Alternatively, masks with different UV transmittances are set on the first region A and the second region B, and then a UV light source is used to irradiate the photocurable resin-liquid crystal mixture. Different masks allow different regions to have different UV light intensities.

[0047] In some examples, in step 2, the first UV light intensity is greater than the second UV light intensity, and the first UV light intensity is 15 mW / cm 2 ~25mW / cm 2 , the second V light intensity is 3mW / cm 2 ~10mW / cm 2 , it is possible to form liquid crystal droplets of different sizes in different areas.

[0048] In some examples, before step one, a first conductive film, a second conductive film and a photocurable resin-liquid crystal mixture are prepared, the photocurable resin-liquid crystal mixture is coated on the first conductive film, and the second conductive film is covered on the photocurable resin-liquid crystal mixture. Roll-to-roll production can be adopted to improve production efficiency.

[0049] The present invention will be further described in detail below through specific examples.

[0050] Example 1

[0051] The raw materials of polymer dispersed liquid crystal (PDLC) are: 30 parts by mass of acrylate oligomer; 25 parts by mass of NOA65; 22 parts by mass of polyethylene glycol diacrylate (average molecular weight 575-700), 13 parts by mass of dipentaerythritol hexaacrylate, 4 parts by mass of isobornyl methacrylate, 3 parts by mass of hydroxyethyl acrylate, 2 parts by mass of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 1 part by mass of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide. 118 parts by mass of liquid crystal AS63-016. Combined with temperature control, the viscosity can be controlled at about 1500cps.

[0052] Curing the polymer dispersed liquid crystal (PDLC): by adding a mask in the second area B, the UV light intensity in the second area B is ensured to be 6mW / cm 2 ; The UV light intensity of the first area A is 20mW / cm 2 The driving voltage of the prepared dimming film in the second area B is 10V, and the driving voltage of the first area A is 20V.

[0053] Drive test: When the input voltage is 10V~20V, the second area B is in a transparent state, the first area A is in a frosted state, and the pattern of the first area A is displayed; when the input voltage is greater than 25V, Figure 2 As shown, the dimming film is in a transparent state as a whole, and no etching marks appear.

[0054] Comparative Example 1

[0055] The raw materials of polymer dispersed liquid crystal (PDLC) are: 30 parts by mass of isobornyl methacrylate; 18 parts by mass of trimethylolpropane triacrylate; 17 parts by mass of polyethylene glycol diacrylate, 17 parts by mass of 2-phenoxyethyl acrylate, 13 parts by mass of hydroxyalkyl methacrylate, 3 parts by mass of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 2 parts by mass of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide. 140 parts by mass of liquid crystal SYMLC-78. The viscosity is about 700cps (the viscosity of conventional PDLC is 300cps to 700cps).

[0056] Curing the polymer dispersed liquid crystal (PDLC): by using a UV dot matrix light source with a control accuracy of 2mm, the UV light intensity in the second area B is ensured to be 6mW / cm 2 ; The UV light intensity of the first area A is 20mW / cm 2 .

[0057] Drive test: Figure 3 As shown, a ring-shaped abnormal area C is formed along the boundary of the first area A. Due to the high liquid crystal content and low polymer content, this area is still in a transparent state in the power-off state, forming a light-transmitting pattern. This is because there is a difference in light intensity at the edge of the first area A during curing, and there are differences in the speed of polymer cross-linking and liquid crystal precipitation. The PDLC of this embodiment has low viscosity, and the resin will be enriched in the area with high light intensity, thereby squeezing the liquid crystal to move to the area with low light intensity, resulting in a change in the PDLC component at the junction of the first area A and the second area B.

[0058] Comparative Example 2

[0059] Laser etching solution: Figure 4 As shown, the ITO at the edge of the first area A is completely interrupted by using a laser. When the power is on, the second area B is transparent, and the first area A is frosted, showing the pattern of the first area A. When the power is off, both the first area A and the second area B are frosted, but there are etching marks on the boundary between the first area A and the second area B.

[0060] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A graphic display dimming film, comprising a first conductive film, a polymer dispersed liquid crystal layer, and a second conductive film sequentially stacked along a first direction, wherein the polymer dispersed liquid crystal layer comprises liquid crystal droplets separated by a polymer, Features The polymer dispersed liquid crystal layer comprises a first region and a second region in a plane direction perpendicular to the first direction, the size of liquid crystal droplets in the first region is smaller than the size of liquid crystal droplets in the second region, and the driving voltage of the first region is higher than the driving voltage of the second region; The driving voltage of the first region differs from the driving voltage of the second region by more than 10V; Based on the working voltage being greater than or equal to the driving voltage of the first area, the graphical display dimming film is in a transparent state as a whole; based on the working voltage being greater than or equal to the driving voltage of the second area and less than the driving voltage of the first area, the first area is in a frosted state and the second area is in a transparent state; based on the working voltage being less than the driving voltage of the second area, the graphical display dimming film is in a frosted state as a whole.

2. The graphic display dimming film according to claim 1, Features: The driving voltage of the first region is 20V to 25V, and the driving voltage of the second region is 8V to 10V; And / or, the first conductive film and the second conductive film are transparent conductive films; And / or, the second area is surrounded by the first area, and the first area is a preset pattern.

3. A graphic display dimming film according to claim 1 or 2, Features: The polymer dispersed liquid crystal layer is made of a photocurable resin-liquid crystal mixture, the photocurable resin-liquid crystal mixture is polymerized under a first UV light intensity to obtain a first region, and the photocurable resin-liquid crystal mixture is polymerized under a second UV light intensity to obtain a second region, and the first UV light intensity is greater than the second UV light intensity; The viscosity of the photocurable resin-liquid crystal mixture is 1500cps-2500cps, and the photocurable resin component in the photocurable resin-liquid crystal mixture contains 25% by mass-40% by mass of acrylate oligomers.

4. A method for preparing a graphic display dimming film according to any one of claims 1 to 3, Features The following steps are involved: Step 1: preparing a stacked structure in which a photocurable resin-liquid crystal mixture is sandwiched between a first conductive film and a second conductive film; Step 2: Apply UV radiation of a first UV intensity to the first area of ​​the photocurable resin-liquid crystal mixture, and apply UV radiation of a second UV intensity to the second area of ​​the photocurable resin-liquid crystal mixture to obtain a graphic display dimming film.

5. The preparation method according to claim 4, Features: The viscosity of the photocurable resin-liquid crystal mixture is 1500 cps to 2500 cps, or the photocurable resin component in the photocurable resin-liquid crystal mixture contains 25 mass % to 40 mass % of acrylate oligomers.

6. The preparation method according to claim 5, Features: The temperature of the photocurable resin-liquid crystal mixture is controlled so that the viscosity of the photocurable resin-liquid crystal mixture is 1500cps to 2500cps during UV irradiation.

7. The preparation method according to any one of claims 4 to 6, Features Applying UV radiation of a first UV light intensity to a first region of the photocurable resin-liquid crystal mixture, and applying UV radiation of a second UV light intensity to a second region of the photocurable resin-liquid crystal mixture comprises: A UV dot matrix light source with a control accuracy of 2 mm provides UV radiation with different UV light intensities to the first area and the second area; Alternatively, a mask for limiting UV transmittance is disposed in the second region, or masks with different UV transmittances are disposed in the first region and the second region, and then a UV light source is used to irradiate the photocurable resin-liquid crystal mixture.

8. The preparation method according to any one of claims 4 to 6, Features In step 2, the first UV light intensity is greater than the second UV light intensity, and the first UV light intensity is 15 mW / cm 2 ~25mW / cm 2 The second UV light intensity is 3mW / cm 2 ~10mW / cm 2 .

9. The preparation method according to any one of claims 4 to 6, Features Before step 1, a first conductive film, a second conductive film and a photocurable resin-liquid crystal mixture are prepared, the photocurable resin-liquid crystal mixture is coated on the first conductive film, and the second conductive film is covered on the photocurable resin-liquid crystal mixture.

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