JP6112237B1 - Light control film and method of manufacturing light control film - Google Patents

Abstract

In a light control film using a multi-domain IPS system or a multi-domain FFS system, when a landscape is viewed through a light control film, the landscape or the like is not seen by a double image. In the light control film 10 for controlling the transmitted light by sandwiching a liquid crystal layer 14 between first and second laminates 13 and 12, and controlling the orientation of liquid crystal molecules 14A related to the liquid crystal layer 14. The first stacked body 13 is provided with a linear electrode 22B, the orientation of the liquid crystal molecules 14A is controlled by a lateral electric field by the linear electrode 22B, and the linear electrode 22B is formed by meandering in a triangular wave shape. A multi-domain is formed, and in a range of at least 10 mm arbitrarily selected in the extending direction of the linear electrode 22B, the length P of a continuous pair of domains changes randomly in the extending direction of the linear electrode 22B. Thus, the linear electrode 22B was produced. [Selection] Figure 4

Description

  The present invention relates to a light control film that is attached to a window or the like of a passenger car to control the transmission of extraneous light.

  Conventionally, for example, various devices relating to a light control film that is attached to a window to control the transmission of external light have been proposed (Patent Documents 1 and 2). One such light control film uses liquid crystal. The light control film using the liquid crystal is produced by sandwiching a liquid crystal material with a transparent film material on which a transparent electrode is produced, and producing the liquid crystal cell with a linear polarizing plate. As a result, in this light control film, the orientation of the liquid crystal is changed by changing the electric field applied to the liquid crystal, thereby blocking or transmitting the extraneous light, and further changing the amount of transmitted light. To control.

  Various driving methods proposed for the liquid crystal display panel can be applied to driving the liquid crystal cell. Specifically, for example, a TN (Twisted Nematic) system, an IPS (In-Place-Switching) system, A driving method such as a VA (Virtual Alignment) method can be applied. However, the light control film has a feature that it can be seen from various directions by being attached to a window glass, for example. Accordingly, it is considered preferable to drive by the IPS system with little viewing angle dependency.

  In this IPS system, a driving electrode is collectively formed on one of a pair of substrates sandwiching a liquid crystal layer, and a so-called lateral electric field which is an in-plane direction of the substrate surface is formed by the electrodes. This is a driving method in which an electric field is formed to control the alignment of the liquid crystal. In the IPS system, for example, a pair of electrodes having a comb shape is arranged by nesting to produce a lateral electric field. An FFS (fringe field switching) method, which is one of the IPS methods, can increase the transmittance. In this FFS method, a transparent electrode is produced on the entire surface of a substrate, and then a linear electrode is produced at a constant pitch with an insulating layer interposed therebetween, and is generated between the transparent electrode and the linear electrode on the entire surface. The orientation of the liquid crystal is controlled by a transverse electric field.

  With regard to such an IPS liquid crystal display device, Patent Document 3 discloses a moiré fringe caused by the period of the concave / convex pattern of the reflector and the electrode pattern in the transflective liquid crystal display device having a reflective portion. The idea which reduces iridescent light is proposed.

  In an IPS mode or FFS mode liquid crystal display panel, when all liquid crystal molecules are rotated in one direction (the same direction) by applying an electric field, there is a problem that each pixel appears colored yellow or blue depending on the viewing direction. In order to avoid this, in these types of liquid crystal display panels, the linear electrodes are periodically bent to create two domains in which the rotation directions of the liquid crystal molecules are reversed by the application of an electric field. Have been proposed to alleviate the coloring phenomenon by averaging the appearances, and these are called the multi-domain IPS system and the multi-domain FFS system. Accordingly, it is conceivable that the light control film is also driven by the multi-domain IPS method and the multi-domain FFS method.

  By the way, as shown in FIG. 8, when sticking the light control film 1 to a window and controlling the transmission of extraneous light, the user 2 views the scenery etc. through the light control film. In the light control film by the multi-domain IPS method and the light control film by the multi-domain FFS method, when the scenery is visually observed through the light control film, the scenery or the like is caused by the diffraction phenomenon due to the difference in retardation between the two domains. There is a problem that can be seen by double images.

JP 03-47392 A Japanese Patent Laid-Open No. 08-184243 JP 2009-8288 A

  The present invention has been made in view of such a situation, and in a light control film using the IPS method or the FFS method, when the landscape is visually observed through the light control film, the landscape and the like can be seen as a double image. The purpose is to avoid.

  In order to solve the above-mentioned problems, the present inventor has conducted extensive research, and for the linear electrodes according to the IPS method and the FFS method, alleviates the regularity related to the multi-domain, or the domain pitch is longer than a certain value. The present invention has been completed.

  Specifically, the present invention provides the following.

(1) In a light control film that sandwiches a liquid crystal layer between first and second laminates and controls transmitted light by controlling the orientation of liquid crystal molecules related to the liquid crystal layer,
The first laminate is provided with a linear electrode, and the alignment of the liquid crystal molecules is controlled by a lateral electric field generated by the linear electrode.
The linear electrode is formed to meander in a triangular wave shape to form a multi-domain,
The linear electrode is produced such that the length of a pair of continuous domains is randomly changed in the extending direction of the linear electrode within a range of at least 10 mm arbitrarily selected in the extending direction of the linear electrode. Light control film.

  According to (1), the regularity in the extending direction of the linear electrode related to the multi-domain can be relaxed, so that the landscape or the like can be prevented from being seen by the double image.

(2) In (1),
The linear electrode is
The light control film whose standard deviation ((sigma)) which concerns on the length of a pair of said domain is 30 micrometers or more and 200 micrometers or less.

  According to (2), by a more specific configuration, regularity can be relaxed so that the landscape of the specific spatial frequency component cannot be seen by the double image.

(3) In the light control film which controls the transmitted light by sandwiching the liquid crystal layer between the first and second laminates and controlling the orientation of the liquid crystal molecules related to the liquid crystal layer,
The first laminate is provided with a linear electrode, and the alignment of the liquid crystal molecules is controlled by a lateral electric field generated by the linear electrode.
The light control film which the said linear electrode meanders by the triangular wave shape, is formed, a multi domain is formed, and the pitch of a domain is 1 mm or more and 5 mm or less.

  According to (3), since the distance of the double image produced by the repetitive structure related to the linear electrode is less than the resolution limit of the human eye, the landscape or the like cannot be seen by the double image. Can be.

(4) In any one of (1) to (3),
The light control film which forms the said horizontal electric field with the said linear electrode by FFS system.

(5) In any one of (1) to (3),
The light control film which forms the said horizontal electric field with the said linear electrode by IPS system.

  According to (4) and (5), it is possible to prevent a landscape or the like from being seen by a double image in the FFS method and the IPS method.

(6) a first laminate production step of producing a first laminate by sequentially producing at least a linear electrode and an alignment layer on a substrate made of a transparent film material;
A second laminate production step of producing an alignment layer on a substrate made of a transparent film material to produce a second laminate;
A laminating step of laminating the first and second laminates with a liquid crystal layer interposed therebetween to produce a liquid crystal cell,
The first laminate manufacturing step includes
The linear electrode is meandered in a triangular wave shape to form a multi-domain,
The linear electrode is produced so that the length of a pair of continuous domains is randomly changed in the extending direction of the linear electrode within a range of at least 10 mm arbitrarily selected in the extending direction of the linear electrode. A method for producing a light control film.

  According to (6), the regularity in the extending direction of the linear electrodes related to the multi-domain can be relaxed, so that when the scenery is viewed through the light control film, the scenery is seen as a double image. Can be prevented.

(7) a first laminate production step of producing a first laminate by sequentially producing at least a linear electrode and an alignment layer on a substrate made of a transparent film material;
A second laminate production step of producing an alignment layer on a substrate made of a transparent film material to produce a second laminate;
A laminating step of laminating the first and second laminates with a liquid crystal layer interposed therebetween to produce a liquid crystal cell,
The first laminate manufacturing step includes
A method for manufacturing a light control film, wherein the linear electrode is meandered in a triangular wave shape to form a multi-domain, and the linear electrode is manufactured with a domain pitch of 1 mm to 5 mm.

  According to (7), since the distance of the double image produced by the repetitive structure related to the linear electrode is less than the resolution limit of the human eye, the landscape or the like cannot be seen by the double image. Can be.

  According to the present invention, in a light control film using a multi-domain IPS method or a multi-domain FFS method, when a landscape is visually observed through the light control film, the landscape or the like is not seen by a double image. it can.

It is a group sectional view showing the light control film concerning a 1st embodiment of the present invention. It is a figure which shows the lower side laminated body in the light control film of FIG. It is a top view with which it uses for description of a multi domain. It is a top view which shows the detail of the linear electrode of FIG. It is a flowchart which shows the manufacturing process of a light control film. It is a flowchart which shows the upper side laminated body preparation process in the manufacturing process of FIG. It is a flowchart which shows the lower side laminated body preparation process in the manufacturing process of FIG. It is a figure where it uses for description of double images, such as scenery.

[First Embodiment]
FIG. 1 is a cross-sectional view showing a light control film according to the first embodiment of the present invention. This light control film 10 is formed by a film shape. The light control film 10 is a light control film that controls transmitted light using liquid crystal, and a liquid crystal material is formed by a lower laminate 13 and an upper laminate 12 that are first and second laminates in the form of a film, respectively. The liquid crystal cell 15 is produced by sandwiching the liquid crystal cell 15, and the liquid crystal cell 15 is produced by sandwiching the liquid crystal cell 15 by the linearly polarizing plates 16 and 17. Here, the liquid crystal cell 15 is a transverse electric field type liquid crystal cell that drives the liquid crystal molecules 14A related to the liquid crystal layer 14 by the FFS method, and the linear polarizing plates 16 and 17 are arranged in a crossed Nicols arrangement. As a result, in the lower laminated body 13, the transparent electrode 22A according to the FFS method is formed on the entire surface of the base 21A, the transparent linear electrode 22B is formed with the insulating layer 23 interposed therebetween, and then the alignment layer 24A. Is provided. In the upper laminate 12, the alignment layer 24B is provided on the base material 21B.

  In the light control film 10, a spacer 24 for keeping the thickness of the liquid crystal layer 14 constant is provided in the upper laminate 12 and / or the lower laminate 13. The linear polarizing plates 16 and 17 are respectively provided with retardation films 18 and 19 for optical compensation on the liquid crystal cell 15 side. The retardation films 18 and 19 may be omitted as necessary. Thus, the light control film 10 controls the transmission of incident light by changing the orientation direction of the liquid crystal molecules 14A related to the liquid crystal layer 14 by changing the applied voltage between the electrodes 22A and 22B. And is configured to switch states. The light control film 10 is provided with a protective layer such as a hard coat layer on the surface opposite to the liquid crystal cell 15 of the linear polarizing plates 16 and 17.

  As the base materials 21A and 21B, various transparent film materials having flexibility applicable to the liquid crystal cell 15 can be applied. In this embodiment, a film made of polycarbonate or the like in which hard coat layers are formed on both surfaces. The material is applied. The electrodes 22A and 22B can be widely applied in various configurations that are perceived as transparent. In this embodiment, a transparent conductive film made of ITO (Indium Tin Oxide), which is a transparent electrode material, is formed on the entire surface of the base 21A. Thus, the electrode 22A is produced. Similarly, a transparent conductive film made of ITO is formed on the entire surface of the substrate 21A, and then patterned to produce the linear electrode 22B.

  As the insulating layer 23, various transparent insulating materials applicable to this type of liquid crystal cell can be applied, and various inorganic materials and organic materials can be applied.

  For the alignment layers 24A and 24B, various material layers applicable to the alignment layer such as polyimide are applied, and the surface of the material layer is formed by forming a fine line-shaped uneven shape by rubbing using a rubbing roll. . Instead of the alignment layer formed by the rubbing process, the alignment layer may be formed by forming a fine line-shaped uneven shape formed by the rubbing process by the shaping process, or by using the photo-alignment layer. Good.

  Various liquid crystal materials applied to this type of light control film can be widely applied to the liquid crystal layer 14.

  The spacer 24 is made of a photoresist in this embodiment although various resin materials can be widely applied. In the liquid crystal cell 15, a sealing agent 25 is arranged in a frame shape surrounding the liquid crystal layer 14. The sealing agent 25 prevents leakage of liquid crystal related to the liquid crystal layer 14, and furthermore, the upper laminate 12 and the lower laminate 13. Are held together. Here, as the sealing agent 25, various materials capable of preventing the liquid crystal from leaking and holding the upper laminated body 12 and the lower laminated body 13 together can be applied. In this embodiment, for example, an epoxy resin is used. A thermosetting resin by an agent, an ultraviolet curable resin by an acrylic resin agent, a curable resin cured by heat and ultraviolet rays, or the like is applied.

  The linear polarizing plates 16 and 17 are so-called sheet polarizers, and after impregnating polyvinyl alcohol (PVA) with iodine or the like, an optical functional layer that performs an optical function as a polarizer is formed by stretching, and TAC ( The optical functional layer is sandwiched between base materials made of a transparent film material such as triacetyl cellulose).

〔electrode〕
FIG. 2 is a diagram showing the electrodes 22A and 22B in the lower laminate 13. In this embodiment, the electrode 22A on the base 21A side is formed on the entire surface of the base 21A, and driving power is supplied through a power supply line (not shown). Further, in the lower laminate 13, an insulating layer 23 is formed so as to cover the entire surface of the electrode 22A. The lower laminate 13 is provided with a power supply line 22BA to the linear electrode 22B at the end of the base 21A so as to extend along the long side of the base 21A, for example. Here, the power supply line 22BA is formed of a metal material film having a small resistance value. In the lower laminate 13, linear electrodes 22B are formed at regular intervals so as to extend from the power supply line 22BA in a direction orthogonal to the power supply line 22BA.

  Thereby, in the light control film 10, the transmitted light is controlled by controlling the orientation of the liquid crystal molecules 14A related to the liquid crystal layer 14 by the electric field formed between the electrode 22A and the linear electrode 22B on the entire surface. Note that, even in the electrode 22A on the base 21A side, a power supply line may be provided to supply driving power in the same manner as the linear electrode 22B. In addition to the power supply line 22BA, the power supply lines of the linear electrodes 22B may be arranged along the long side on the other side, and more than three may be arranged at a constant pitch. Of course, it may be produced so as to extend along the short side.

  Further, in this embodiment, the electrode 22B is formed so as to extend along the short side as described above, and is formed so as to meander in a triangular wave shape in the extending direction, whereby a multi-domain having two domains is formed. To drive the liquid crystal molecules.

  FIG. 3 is a plan view showing in detail a configuration relating to meandering of the linear electrode 22B by enlarging the linear electrode 22B. The linear electrode 22B is formed so as to be inclined obliquely with respect to the extending direction of the linear electrode 22B, and the obliquely inclined direction is alternately switched at a constant pitch, thereby meandering in a triangular wave shape. It is formed. Thereby, the light control film 10 rotates the liquid crystal molecules 14A counterclockwise as indicated by an arrow A by driving the linear electrode 22B, or rotates the liquid crystal molecules 14A clockwise as indicated by an arrow B. In other words, the direction of rotation of the liquid crystal molecules 14A in consecutive domains is made different. Thereby, in the light control film 10, the appearance in the two domains in which the rotation directions of the liquid crystal molecules 14A are different in this way is averaged, and the phenomenon of coloring due to the change in the viewing angle is alleviated.

  In this way, the direction of inclination is switched at a constant pitch, and as shown in FIG. 4, in the light control film 10, the pitches P 1, P 2, and P 3 related to one cycle of the inclination switching are 1 related to this pitch. It is formed to change randomly in a sequence of pairs of domains. Thereby, in the light control film 10, the regularity regarding the meandering of the linear electrode which concerns on production of a multi domain is relieve | moderated, and this avoids the phenomenon in which a landscape etc. are seen with a double image effectively.

  That is, in the case where the linear electrode 22B is produced so as to meander in a triangular wave shape by switching the direction of inclination in this way, if this pitch is set to a constant value, a specific phenomenon is caused by the diffraction phenomenon due to the repeating structure related to this meandering Scenery can be seen by double images.

  However, as in this embodiment, if the pitches P1, P2, and P3 related to one cycle of the inclination change are changed randomly in a continuous pair of domains to relax the regularity related to meandering, the landscape is doubled. It is possible to effectively avoid the phenomenon seen by the image.

  More specifically, in the light control film 10, the linear electrode 22B is produced so that the length of each domain becomes equal in a pair of domains related to one period of the pitches P1, P2, and P3. That is, in FIG. 4, the linear electrodes 22B are formed so that the pitches P1A and P1B, the pitches P2A and P2B, and the pitches P3A and P3B are equal. Thereby, in the light control film 10, even when repetitive regularity is relieved, the appearance in two continuous domains forming a pair is surely averaged to relieve the phenomenon of coloring due to a change in viewing angle.

  In the light control film 10, the linear electrode 22B is produced with an average value of pitches P1, P2, and P3 of 100 μm or more and 300 μm or less, and more preferably an average value of 150 μm or more and 200 μm or less. Further, the linear electrode 22B can relax the regularity and sufficiently avoid the phenomenon that the landscape is seen by the double image, and the pitches P1, P2, and P3 change randomly in the continuation of a pair of domains. As a result, the pitch P varies. Here, this variation is produced when the standard deviation (σ) is 30 μm or more and 200 μm or less, more preferably 60 μm or more and 120 μm or less. In addition, by setting the variation in this way, the portions where the absolute value of the difference between adjacent pitches is 10 μm or less are continuous so that the regularity of the pitches by the same value is not continuously secured. So that it does not occur.

  The linear electrode 22B is manufactured in this manner so as to relax the regularity related to meandering, and is manufactured so that the same pattern repeats at a repetition pitch of 10 mm or more in the extending direction of the linear electrode. It is configured so that it can be manufactured by patterning using a mask having a random arrangement repeatedly or by patterning using a mask having a large area that is manufactured by repeatedly using a local mask having a random arrangement.

  Here, if the repetition pitch of the same pattern in the extending direction of the linear electrode is small, the regularity of the linear electrode cannot be sufficiently relaxed, and a double image is observed. However, if the repetition pitch of the same pattern is too large, the production of a mask for patterning the linear electrode becomes complicated. Thereby, the repetition pitch of this same pattern is set to 10 mm or more and 100 mm or less, More preferably, it is set to 20 mm or more and 50 mm or less.

  Thereby, in this embodiment, in the range of at least 10 mm arbitrarily selected in the extending direction of the linear electrode 22B, the pitch related to the length of the continuous pair of domains is set randomly in the continuous domains. become.

〔Manufacturing process〕
FIG. 5 is a flowchart for explaining the manufacturing process of the light control film. In the manufacturing process of the light control film, the upper laminated body 12 and the lower laminated body 13 are produced in the upper laminated body producing process SP2 and the lower laminated body producing process SP3, respectively. In the stacking step SP4, the upper stacked body 12 and the lower stacked body 13 are stacked with the liquid crystal layer 14 interposed therebetween, and then integrated with a sealant 25 to manufacture a liquid crystal cell. In the manufacturing process of the light control film, the liquid crystal cell thus prepared is laminated and integrated with the linear polarizing plate to prepare a light control film.

  FIG. 6 is a flowchart showing in detail the upper laminate manufacturing process SP2. In the upper laminate manufacturing process SP2 (SP11), the alignment layer manufacturing process SP12 applies the coating liquid related to the alignment layer 24B to the base material 21B, and then dries and cures the material to form the alignment layer 24B. A layer is formed. In this manufacturing process, a fine line-shaped uneven shape is formed on the surface of the alignment layer material layer by a rubbing process using a rubbing roll, whereby the alignment layer 24B is manufactured, and thus the upper laminate 12 is manufactured.

  FIG. 7 is a flowchart showing in detail the lower laminate manufacturing process SP3. In the lower laminate manufacturing process SP3 (SP21), in the electrode manufacturing process SP22, the transparent electrode 22A made of ITO is manufactured on the entire surface of the base 21A by sputtering. Subsequently, in this manufacturing process, the insulating layer 23 is manufactured in the insulating layer manufacturing process SP23. In this insulating layer manufacturing step, the insulating layer 23 is manufactured by, for example, coating, drying, and curing of a coating liquid according to the material applied to the insulating layer 23.

  Subsequently, in this manufacturing process, the linear electrode 22B is manufactured in the electrode manufacturing process SP24. More specifically, in this electrode manufacturing step SP24, a metal material related to the linear electrode 22B is deposited on the entire surface of the base material 21A by sputtering using a sputtering apparatus in the metal layer manufacturing step SP24-1. Layer 26 is created. Further, the linear electrode 22B is produced by patterning in the subsequent patterning step SP24-2. In this embodiment, the regularity related to the linear electrode 22B is relaxed by patterning in the patterning step.

  When the linear electrode 22B is manufactured in this way, this manufacturing process is performed in the spacer manufacturing process SP25, after applying a photoresist on the entire surface and drying it, the spacer 24 is then exposed and developed using a mask. Make it.

  Then, in alignment layer preparation process SP26, the material liquid of alignment layer 24A is formed by applying the coating liquid which concerns on alignment layer 24A, and drying and hardening. In this manufacturing process, a fine line-shaped uneven shape is formed on the surface of the alignment layer material layer by a rubbing process using a rubbing roll, and the alignment layer 24A is manufactured, whereby the lower laminate 13 is manufactured. .

  According to the above configuration, the regularity of the domain is relaxed by randomly setting the length of the pair of domains by the linear electrodes so that the landscape or the like cannot be seen by the double image. be able to.

[Second Embodiment]
In this embodiment, the multi-domain method is used in the same manner as in the first embodiment, and the pitch of the domains is set to 1 mm or more so that the landscape or the like cannot be seen by the double image. . This embodiment has the same configuration as that of the first embodiment except that the configuration related to this domain is different.

  That is, in this embodiment, the domains are produced with a constant pitch, and thereby the domains are produced regularly. In addition, the domains are regularly formed in this manner, and the domain pitch (repetitive pitches represented by symbols P1, P2, and P3 in FIG. 4) is set to 1 mm or more.

  That is, a double image of a landscape or the like is due to a diffraction phenomenon due to regularity related to the domain structure, and is considered to be produced by zero-order light and first-order light due to this diffraction phenomenon. In the diffraction grating, with respect to the distance D of the condensing position by the zero-order light and the first-order light, the pitch related to the periodic structure of the diffraction grating is set as p, and the vertical distance from the diffraction grating to the image point is set as L. And D = λL / p. Here, λ is a wavelength. Thus, it can be seen that when the pitch p related to the periodic structure is increased, the distance D between the diffraction images of the 0th order light and the 1st order light is reduced.

  Here, when the pitch p is about 300 μm, a double image can be clearly confirmed. However, when the pitch p is about 500 μm, it is difficult to visually recognize the double image, and when the pitch p is 1 mm or more, it is practical. The distance between the double images can be made sufficiently smaller than the resolution limit of the human eye, so that the scenery or the like cannot be seen by the double images. Although it is desirable that the pitch p is preferably 2 mm or more, if the pitch p is too large, it is difficult to sufficiently secure the effect of alleviating the coloring phenomenon due to the change in the viewing angle by multi-domain. .

  Thereby, the pitch p is 1 mm or more and 5 mm or less, preferably 2 mm or more and 4 or less.

  In this embodiment, even if the pitch of the domain is set to 1 mm or more and 5 mm or less, the same effect as that of the first embodiment can be obtained.

[Third Embodiment]
In this embodiment, liquid crystal molecules are driven by a lateral electric field by the IPS method. This embodiment is configured in the same manner as the first and second embodiments except that the configuration of the electrodes relating to the method for producing the lateral electric field is different.

  Therefore, in this embodiment, after the transparent electrode material made of ITO is produced by sputtering on the entire surface of the base material made of the transparent film material according to the lower laminate, the linear electrodes are sequentially arranged by patterning the transparent electrode material. The first and second comb electrodes are arranged by nesting, and a horizontal electric field is produced by the electric field between the linear electrodes.

  In this embodiment, the linear electrodes related to the first and second comb-teeth electrodes are formed by setting random electrode widths and / or random electrodes in the same manner as the linear electrodes described above for the first embodiment. It is produced by setting the interval. Moreover, it is produced so as to meander in a triangular wave shape in the extending direction, is multi-domained, and the pitch related to a continuous pair of domains is set at random as in the first embodiment. Instead of this, the same multi-domain setting as in the second embodiment is produced.

  Even when applied to driving by the IPS system as in this embodiment, the same effects as those of the first and second embodiments can be obtained.

[Other Embodiments]
The specific configuration suitable for the implementation of the present invention has been described in detail above, but the present invention is combined with the above-described embodiments and further modified in various ways without departing from the spirit of the present invention. can do.

DESCRIPTION OF SYMBOLS 1, 10 Light control film 2 User 12 Upper side laminated body 13 Lower side laminated body 14 Liquid crystal layer 14A Liquid crystal molecule 15 Liquid crystal cell 16, 17 Linearly polarizing plate 18, 19 Phase difference film 21A, 21B Base material 22A Electrode 22B Linear electrode 22BA Power supply line 23 Insulating layer 24A, 24B Alignment layer 25 Sealing agent

Claims (5)

In the light control film that sandwiches the liquid crystal layer between the first and second laminates and controls the transmitted light by controlling the orientation of the liquid crystal molecules related to the liquid crystal layer,
The first laminate is provided with a linear electrode, and the alignment of the liquid crystal molecules is controlled by a lateral electric field generated by the linear electrode.
The linear electrode is formed by meandering in a triangular wave shape to form a multi-domain, and in the range of at least 10 mm arbitrarily selected in the extending direction of the linear electrode, the length of a pair of continuous domains is The light control film with which the said linear electrode was produced so that it might change at random in the extension direction of a linear electrode. The linear electrode is
The light control film according to claim 1, wherein a standard deviation (σ) related to the length of the pair of domains is 30 μm or more and 200 μm or less. The FFS mode, light control film of claim 1 or 2 to form the transverse electric field in the linear electrode. The IPS system, light control film of claim 1 or 2 to form the transverse electric field in the linear electrode. A first laminate production step of producing a first laminate by sequentially producing at least a linear electrode and an alignment layer on a substrate made of a transparent film material;
A second laminate production step of producing an alignment layer on a substrate made of a transparent film material to produce a second laminate;
A laminating step of laminating the first and second laminates with a liquid crystal layer interposed therebetween to produce a liquid crystal cell,
The first laminate manufacturing step includes
The linear electrode is meandered in a triangular wave shape to form a multi-domain,
The linear electrode is produced so that the length of a pair of continuous domains is randomly changed in the extending direction of the linear electrode within a range of at least 10 mm arbitrarily selected in the extending direction of the linear electrode. The manufacturing method of a light control film.

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