JP2012058362A - Screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen which can suppress luminance unevenness of a projected image and allows a viewing angle to be arbitrarily changed.SOLUTION: A screen 100 is provided for displaying a projected image and includes: a screen body 10 having flexibility and comprising a reflecting film 11 and a support film 12; and a plurality of actuators 20 which are installed for the support film 12 for displaying the image on the screen body 10 and have projections 24 formed so as to project toward the support film 12. The actuators 20 are configured so as to be deformed by electric stimuli to have the projections 24 pressed to a rear side of the screen body 10.

Description

  The present invention relates to a screen.

Various attempts have been made to change the shape of the screen and eliminate uneven brightness in the projected image (see, for example, Patent Document 1).
In the above attempt, a support leg that can be contracted is installed on the back surface of the screen, and the above problem is attempted to be solved by changing the curvature of the screen by expanding and contracting the support leg.
However, with the recent increase in the size of the screen, the above method requires a support leg having a large stroke, and its control is difficult.

JP 2009-122414 A

  An object of the present invention is to provide a screen that can suppress uneven brightness of a projected image and can arbitrarily change a viewing angle.

Such an object is achieved by the present invention described below.
The screen of the present invention is a screen for displaying a projected image,
A flexible planar screen body;
A plurality of actuators that are installed on the back side opposite to the display surface that displays the image of the screen body and have convex portions that are formed to be convex toward the back surface;
The actuator is configured to be deformed by electrical stimulation and to press the convex portion against the back surface of the screen body.
Accordingly, it is possible to provide a screen that can suppress luminance unevenness of the projected video and can arbitrarily change the viewing angle.

In the screen of the present invention, it is preferable that one actuator has a plurality of convex portions.
Thereby, the luminance unevenness of the projected image can be more effectively suppressed, and the viewing angle can be changed more easily.
In the screen of the present invention, the actuator is a plate-like member having a longitudinal direction, and an actuator body having the convex portion in the vicinity of one end in the longitudinal direction;
A pair of electrode plates provided at the other end in the longitudinal direction of the actuator main body and installed so as to sandwich the actuator main body,
It is preferable that the actuator body bends toward the screen body by applying a voltage to the pair of electrode plates, and the convex portion is pressed against the back surface of the screen body.
As a result, it is possible to more efficiently suppress luminance unevenness of the projected image and to change the viewing angle more easily.

In the screen according to the aspect of the invention, the pair of electrode plates is arranged to be opposed to the first electrode plate composed of a plurality of linear conductors arranged in a lattice shape and the first electrode plate. A second electrode plate composed of a plurality of linear conductors arranged,
It is preferable that the actuator body is sandwiched between an intersection where the conductors of the first electrode plate intersect with each other and an intersection where the conductors of the second electrode plate intersect.
Thereby, the actuator can be driven easily, and the viewing angle can be changed more easily. Further, it is possible to more efficiently suppress luminance unevenness of the projected image.

In the screen of the present invention, it is preferable that the actuator body is made of a stimulus-responsive compound whose molecular structure is changed by an oxidation-reduction reaction.
Thereby, the actuator can be driven at a lower voltage.
In the screen of the present invention, the stimulus-responsive compound includes a unit A having a bond that functions as a rotation axis;
A first unit B disposed at a first binding site of the unit A;
A second unit B disposed at a second binding site of the unit A;
A first unit C disposed at a third binding site of the unit A;
A second unit C disposed at a fourth binding site of the unit A;
Including
The first unit B and the second unit B are combined by a redox reaction,
It is preferable that the first unit C and the second unit C have liquid crystallinity and include a polymerizable functional group.
Thereby, the actuator can be driven at a lower voltage.

In the screen of the present invention, the stimulus-responsive compound includes a unit A having a bond that functions as a rotation axis;
A first unit B disposed at a first binding site of the unit A;
A second unit B disposed at a second binding site of the unit A;
A first unit C coupled to the first unit B;
A second unit C coupled to the second unit B;
Have
The first unit B and the second unit B are bonded by an oxidation-reduction reaction,
The first unit C and the second unit C preferably have liquid crystallinity.
Thereby, the actuator can be driven at a lower voltage.

In the screen of the present invention, a pair of alkyl chains,
A cross-linking part that cross-links between the pair of alkyl chains;
A liquid crystalline functional group bonded to at least one of the pair of alkyl chains,
The bridging portion has a bond that functions as a rotation axis, and has a first group located at one end of the bond and a second group located at the other end of the bond;
A first unit B disposed at a first binding site of the first group;
A second unit B disposed at a first binding site of the second group,
The bridging part is bonded to one alkyl chain at the second binding site of the first group, and bonded to the other alkyl chain at the second binding site of the second group;
It is preferable that the first unit B and the second unit B are bonded by an oxidation-reduction reaction.
Thereby, the actuator can be driven at a lower voltage.

これにより、より低電圧でアクチュエータを駆動させることができる。 In the screen of the present invention, a plurality of deformable groups whose molecular structure is deformed by a redox reaction,
A plurality of liquid crystal functional groups having liquid crystal properties;
A plurality of linking groups represented by the following formula (12) for linking the deformable group and the liquid crystalline functional group;
The deformable group has a bond that functions as a rotating shaft, and has a first group located at one end of the bond and a second group located at the other end of the bond;
A first unit B disposed at a first binding site of the first group;
A second unit B disposed at a first binding site of the second group,
The deformable group is bonded to the linking group at a second binding site of the first group and a second binding site of the second group;
It is preferable that the first unit B and the second unit B are bonded by an oxidation-reduction reaction.

Thereby, the actuator can be driven at a lower voltage.

It is sectional drawing which shows suitable embodiment of the screen of this invention. It is sectional drawing which shows the state which the actuator of the screen shown in FIG. 1 driven. It is a top view which shows an example of the arrangement | sequence of an actuator. It is a top view which shows the arrangement | sequence of the convex part on an actuator. It is a top view which shows another example of the arrangement | sequence of an actuator. It is a figure for demonstrating the molecular structure before and behind the oxidation reduction reaction of a stimulus responsive compound. It is a figure for demonstrating the molecular structure before and behind the oxidation reduction reaction of a stimulus responsive compound. It is a figure for demonstrating the molecular structure before and behind the oxidation reduction reaction of a stimulus responsive compound. It is a figure for demonstrating the molecular structure before and behind the oxidation reduction reaction of a stimulus responsive compound. It is a figure for demonstrating the molecular structure before and behind the oxidation reduction reaction of a stimulus responsive compound.

Hereinafter, preferred embodiments of the present invention will be described in detail.
"screen"
Hereinafter, the screen of the present invention will be described.
The screen of the present invention is a screen having a function of displaying an image projected from a projector.

FIG. 1 is a cross-sectional view showing a preferred embodiment of the screen of the present invention, FIG. 2 is a cross-sectional view showing a state where actuators of the screen shown in FIG. 1 are driven, and FIG. 3 is a plan view showing an example of the arrangement of the actuators. FIG.
As shown in FIG. 1, the screen 100 includes a screen body 10 and an actuator 20.

The screen body 10 is planar and flexible, and as shown in FIG. 1, the reflection film 11 having a display surface for displaying a projected image, and the display surface of the reflection film 11 are And a support film 12 provided on the opposite side and having the back surface of the screen main body 10.
The reflective film 11 has a function of displaying the image by reflecting the image projected from the projector.

The material constituting the reflective film 11 is not particularly limited as long as it has flexibility, and for example, a resin material containing a white pigment such as titanium oxide or barium hydroxide can be used.
The support film 12 has flexibility and a function of supporting the reflective film 11.

The material constituting the support film 12 is not particularly limited as long as it has flexibility, and for example, rubber or the like can be used.
As shown in FIGS. 1 and 3, the actuator 20 is arranged with a first electrode plate 21 made of a linear conductor and facing the first electrode plate 21, and is made of a linear conductor. And a plurality of actuator bodies 23 sandwiched between the first electrode plate 21 and the second electrode plate 22.

The first electrode plate 21 and the second electrode plate 22 have a function of applying a voltage to an actuator body 23 described later, and a function of holding the actuator body 23.
It does not specifically limit as a material which comprises the 1st electrode plate 21 and the 2nd electrode plate 22, A well-known conductor material can be used.

As shown in FIGS. 1 and 3, the actuator body 23 is composed of a plate-like member having a longitudinal direction, and one convex portion 24 is formed at one end portion in the longitudinal direction. As shown in FIG. 1, the other end of the actuator body 23 is sandwiched between the pair of electrode plates (the first electrode plate 21 and the second electrode plate 22).
The actuator body 23 is configured to bend toward the screen body 10 as shown in FIG. 2 by applying a voltage to the pair of electrode plates.
Examples of the material constituting the portion of the actuator body 23 that bends when a voltage is applied include a bucky gel material and a stimulus-responsive compound as described below.

  The convex portion 24 is provided on a surface of the actuator body 23 that faces the back surface of the screen body 10 (support film 12). The convex portion 24 is pressed against the back surface of the screen body 10 (support film 12) by bending the actuator body 23 toward the screen body 10 as shown in FIG. It has a function to change the surface shape of the display surface.

The average diameter of the convex portions 24 is preferably 10 μm or more and 20 μm or less. Thereby, luminance unevenness can be more effectively suppressed. In addition, the viewing angle can be adjusted more easily.
Moreover, it is preferable that the average height of the convex part 24 is 10 micrometers or more and 20 micrometers or less. Thereby, luminance unevenness can be more effectively suppressed. In addition, the viewing angle can be adjusted more easily.

In the present embodiment, as shown in FIG. 3, a plurality of actuators 20 having a plurality of actuator bodies 23 sandwiched between a pair of electrode plates are arranged on the back surface side (support film 12 side) of the screen body 10. ing.
According to such a screen 100, by applying a voltage to the first electrode plate 21 and the second electrode plate 22, the actuator body 23 is bent, and the convex portion 24 of the actuator body 23 supports the screen body 10. The shape of the portion pressed against the film 12 (back surface) and pressed against the reflective film 11 (display surface) of the screen body 10 is deformed into a convex shape as shown in FIG. By performing such deformation over the entire screen body 10, the reflection angle of the entire reflection film 11 is increased, and the viewing angle can be increased. Further, the viewing angle of the screen 100 can be arbitrarily changed by adjusting the voltage to be applied. In addition, when luminance unevenness occurs in the video, for example, the voltage is applied to the actuator body 23 in the vicinity where the luminance unevenness is generated to change the surface shape of the reflective film 11 or the like. It is possible to suppress.

  In the above-described embodiment, the description has been given of the case where one convex portion 24 is formed on the surface of one actuator main body 23. However, the present invention is not limited to this. For example, as shown in FIG. A plurality of convex portions 24 may be formed on the surface of the main body 23. By adopting such a configuration, it is possible to more efficiently suppress the luminance unevenness of the projected video and to change the viewing angle more easily.

  In the above-described embodiment, the arrangement example of the actuators 20 has been described as shown in FIG. 3, but is not limited thereto, and for example, a configuration as shown in FIG. 5 may be used. That is, the actuator 20 includes a first electrode plate 21 composed of a plurality of linear conductors arranged in a lattice shape, and a plurality of lines arranged opposite to the first electrode plate 21 and arranged in a lattice shape. Sandwiched between the second electrode plate 22 made of a conductor, the intersection where the conductors of the first electrode plate 21 intersect, and the intersection where the conductors of the second electrode plate 22 intersect The actuator main body 23 may be configured. Thereby, the actuator 20 can be driven easily and the viewing angle can be changed more easily. Further, it is possible to more efficiently suppress luminance unevenness of the projected image.

《Stimulus responsive compound》
Next, a stimulus-responsive compound whose molecular structure is changed by an oxidation-reduction reaction will be described as an example of a material constituting at least the bent portion of the actuator body 23.
When a stimuli-responsive compound as described below is used, when a voltage is applied to a pair of electrode plates, an oxidation reaction proceeds and expands on the side of the actuator body 23 that is in contact with the second electrode plate 22, and the actuator On the side of the main body 23 in contact with the first electrode plate 21, the reduction reaction proceeds and contracts. As a result, as shown in FIG. 2, it bends in the direction in which the reduction reaction has occurred.

<First Embodiment>
Next, the first embodiment of the stimulus-responsive compound whose molecular structure is changed by the oxidation-reduction reaction will be described in detail.
6 and 7 are diagrams for explaining the molecular structure before and after the redox reaction of the stimulus-responsive compound of this embodiment. In FIGS. 6 and 7, ◯ means a functional group, and a line means a bond.

As shown in FIG. 6A, the stimulus-responsive compound of the present embodiment includes a unit A having a bond that functions as a rotation axis, and two units B (first unit B) bonded to both ends of the unit A. And a second unit B) and two units C (a first unit C and a second unit C) coupled to each unit B.
A stimulus-responsive compound refers to a compound having a function of deforming (displace) the shape of a molecule by stimulation.

The unit A constituting the stimulus-responsive compound has a bond that functions as a rotation axis, and is a group (unit) that can rotate around the bond. By having such a unit, the stimulus-responsive compound can be deformed (displaced).
As the unit A, for example, a group in which two aromatic rings are bonded can be used. Among them, a group selected from the group consisting of the following formulas (1) to (3) is preferable. By using such a group as the unit A, the stimulus-responsive compound can be more smoothly deformed (displaced) and driven at a lower voltage.

As shown in FIG. 6A, the unit B (the first unit B and the second unit B) has both ends in the rotation axis direction of the unit A (the first coupling site and the second coupling of the unit A). Group). That is, the first unit B is bonded to the first binding site of unit A, and the second unit B is bonded to the second binding site of unit A.
Unit B is a group that forms a bond between units B by an oxidation-reduction reaction (see FIG. 6B). In other words, it is a group that forms a bond by receiving (reducing) electrons from the outside. Further, it is a group that releases bonds by releasing (oxidizing) electrons to the outside.

  The unit B (the first unit B and the second unit B) is particularly a group that forms a bond by oxidation-reduction reaction between the units B (the first unit B and the second unit B). Although not limited, the unit B (the first unit B and the second unit B) is preferably a group represented by the following formula (4). Thereby, the coupling | bonding state and non-bonding state of units B can be made to reversibly and easily advance by adjusting reaction conditions. Moreover, since the reactivity is high, the stimulus-responsive compound can be deformed more smoothly and at a low voltage.

  The unit C (first unit C and second unit C) is a group bonded to the unit B and is a group having liquid crystallinity. The first unit B is coupled to the first unit B, and the second unit C is coupled to the second unit B. By having liquid crystallinity, the unit C exhibits a certain alignment by using a liquid crystal alignment technique. As a result, the rapid response compound has a certain direction for driving.

The unit C (the first unit C and the second unit C) is not particularly limited as long as it is a group exhibiting liquid crystallinity, and a group having a plurality of ring structures, for example, a plurality of phenyl groups is connected by an ester group. And those in which a benzene ring or a cyclohexane ring is directly connected.
As the unit C, it is particularly preferable to use a group in which one or more halogen atoms are bonded to one ring structure among a plurality of ring structures. Thereby, the exercise | movement performance at the time of orientation of the unit C can be made higher, and the speed | rate of the transfer to orientation becomes quicker. As a result, the stimulus-responsive compound can be deformed (displaced) more quickly and smoothly, and is driven at a lower voltage.

Further, the unit C (the first unit C and the second unit C) preferably has a polymerizable functional group. A stimulus-responsive compound having a longer molecular chain can be formed by polymerizing the stimulus-responsive compound by the polymerizable functional group. Further, by elongating the molecular chain in this manner, as described in detail later, the degree of molecular deformation (displacement) can be increased, and it is possible to drive with a stronger force (stress).
Specific examples of the unit C (first unit C and second unit C) include the following.

  As described above, the stimulus-responsive compound of the present embodiment includes the unit A capable of rotating the shaft and the two units bonded to both ends (the first binding site and the second binding site) of the unit A. Then, unit B (first unit B and second unit B) capable of forming a bond between units by oxidation-reduction reaction, and unit B (first unit B and second unit B) The unit is characterized in that it includes two units C (first unit C and second unit C) having liquid crystal properties. By having such a feature, it can be deformed (displaced) with low power, and the degree of displacement can be made relatively large. This is considered to be due to the following reasons.

  That is, a plurality of stimuli-responsive compound molecules can exist in an aligned (aligned) state by the unit C having liquid crystallinity, and a voltage or the like is applied in the aligned state so that the units B in one molecule can be connected to each other. Bonds (crosslinks) by redox reaction. Thus, by utilizing the orientation (liquid crystallinity) of unit C and the binding property of unit B by stimulation, the state shown in FIG. 6 (a) is surely changed to the state shown in FIG. It can be deformed (displaced). In particular, since the orientation of the unit C and the coupling between the units B proceed at a low voltage, a large deformation (displacement) is possible at a low voltage.

In addition, when the stimuli responsive compound which unit C superposed | polymerized using the polymeric functional group is used, as above-mentioned, a big deformation | transformation is attained at a low voltage.
That is, before applying the voltage (before the oxidation-reduction reaction proceeds), as shown in FIG. 7A, long molecules exist in an extended state. When a voltage is applied thereto, as shown in FIG. 7B, the unit A rotates about the axis, the adjacent units B are bonded together by a redox reaction, and the liquid crystalline unit C is aligned. , A long molecule is folded. For this reason, the degree of displacement can be increased.

Second Embodiment
Next, the second embodiment of the stimulus-responsive compound whose molecular structure is changed by the redox reaction will be described in detail.
The stimuli-responsive compound of the present embodiment includes bithiophene (unit A) and two 1,3-benzoates bound to the two α positions of the bithiophene (the first binding site and the second binding site of unit A). Dithiolyl group (first unit B and second unit B) and two liquid crystal bonded to two β-positions of bithiophene (third binding site and fourth binding site of unit A) It has a liquid crystalline functional group (first unit C and second unit C), and specifically can be represented by the following formula (6). In formula (6), R represents a liquid crystalline functional group.

The stimulus-responsive compound refers to a compound having a function of deforming (displace) the shape of a molecule by stimulation.
Bithiophene has a bond that functions as a rotation axis, and is a group that can rotate around the bond. By having bithiophene, the stimulus-responsive compound can be deformed (displaced).

  As shown in the above formula (6), 1,3-benzodithiolyl group is bonded to the two α-positions of bithiophene. The 1,3-benzodithiolyl group is a group that forms a bond by oxidation-reduction reaction between 1,3-benzodithiolyl groups. In other words, it is a group that forms a bond by receiving (reducing) electrons from the outside. Further, it is a group that releases bonds by releasing (oxidizing) electrons to the outside.

By adjusting the reaction conditions when the stimulus-responsive compound of the present embodiment has a 1,3-benzodithiolyl group, the binding state and non-bonding state of 1,3-benzodithiolyl groups can be changed. It can proceed reversibly and easily. Moreover, since the reactivity is high, the stimulus-responsive compound can be deformed more smoothly and at a low voltage.
In addition, a liquid crystalline functional group having liquid crystallinity (a functional group represented by R in the formula) is bonded to two β-positions of the biophen. By having liquid crystallinity, the liquid crystalline functional group exhibits a certain alignment by using a liquid crystal alignment technique. As a result, the stimulus-responsive compound has a certain direction for driving.

  The liquid crystalline functional group is not particularly limited as long as it is a group exhibiting liquid crystallinity, and a group having a plurality of ring structures, for example, a group in which a plurality of phenyl groups are linked by an ester group, a benzene ring or a cyclohexane ring is directly linked. The thing which was done is mentioned. In particular, since it exhibits high liquid crystallinity, it is preferable to use one in which a benzene ring or a cyclohexane ring is directly connected, as indicated by R in the above formula (6).

  As the liquid crystalline functional group, it is particularly preferable to use a group in which one or more halogen atoms are bonded to one ring structure among a plurality of ring structures. Thereby, the movement performance at the time of alignment of a liquid crystalline functional group can be made higher, and the speed | rate of transfer to alignment becomes quicker. As a result, the stimulus-responsive compound can be deformed (displaced) more quickly and smoothly, and is driven at a lower voltage.

  Moreover, the liquid crystalline functional group has a polymerizable functional group. The stimuli-responsive compound can be polymerized by this polymerizable functional group. As a result, a stimulus-responsive compound polymer having a longer molecular chain can be formed. Further, by elongating the molecular chain in this manner, as described in detail later, the degree of molecular deformation (displacement) can be increased, and it is possible to drive with a stronger force (stress).

The polymerizable functional group is not particularly limited, but is preferably a vinyl group or an acrylic group. Thereby, the stimulus responsive compound polymer obtained by polymerizing the stimulus responsive compound can be obtained more easily. Moreover, the mobility of the obtained stimulus-responsive compound polymer can be increased, and the degree of deformation (deformation rate) can be further increased.
The polymerizable functional group is preferably bonded to the liquid crystalline functional group via an oxygen or methylene group. By having such a configuration, the mobility of the stimulus-responsive compound polymer obtained by polymerizing the stimulus-responsive compound can be further increased, and the degree of deformation (deformation rate) is higher. can do.

The liquid crystalline functional group is preferably bonded to bithiophene via an alkylene group. Thereby, the mobility (orientation) of the liquid crystalline functional group can be improved, and the direction of deformation (driving) of the stimulus-responsive compound can be made more constant.
Specific examples of such a liquid crystalline functional group can include the same examples as those of the unit C (first unit C and second unit C) as described in the first embodiment. .

  As described above, the stimuli-responsive compound of the present embodiment binds to bithiophene (unit A) capable of axial rotation and α-position (first binding site and second binding site of unit A) of bithiophene. , Two 1,3-benzodithiolyl groups (first unit B and second unit B) that form a bond by oxidation-reduction reaction, and β-position of ubithiophene (the third binding site of unit A and It has a feature in that it has two polymerizable liquid crystal functional groups (first unit C and second unit C) bonded to (fourth binding site). By having such a feature, it is possible to provide a stimulus-responsive compound having a high deformation rate and capable of directional deformation. This is considered to be due to the following reasons.

That is, a plurality of stimuli-responsive compound molecules can exist in an aligned (aligned) state by a liquid crystalline functional group, and a voltage or the like is applied in the aligned state to apply 1,3-benzodithiol in one molecule. Auryl groups are bonded (crosslinked) by an oxidation-reduction reaction. Thus, by utilizing the orientation of the liquid crystalline functional group (liquid crystallinity) and the binding property of the 1,3-benzodithiolyl group, from the state shown on the left side of the following formula (7), the following formula ( 7) can be reliably deformed (displaced) into the state shown on the right. Thereby, the degree of deformation can be increased by the bond due to the redox reaction of the 1,3-benzodithiolyl group while giving a certain direction to the deformation of the molecule by the liquid crystalline functional group. Further, since the alignment of the liquid crystalline functional group and the bond between the 1,3-benzodithiolyl groups proceed at a low voltage, a large deformation (displacement) is possible at a low voltage.
In addition, since the stimulus-responsive compound has a polymerizable functional group, a stimulus-responsive compound polymer having a high deformation rate and capable of directional deformation can be easily formed.

Moreover, as a stimulus responsive compound of this embodiment, said compound may be used as it is, and the polymer (stimulus responsive compound polymer) which polymerized said compound may be used. Hereinafter, the stimulus-responsive compound polymer will be described.
FIG. 8 is a diagram for explaining the molecular structure before and after the redox reaction of the stimulus-responsive compound (stimulus-responsive compound polymer).
The stimulus-responsive compound polymer is obtained by polymerizing the above-mentioned stimulus-responsive compound with a polymerizable functional group.

When the stimulus-responsive compound is polymerized, in the oxidized state, a long molecule exists in an extended state as shown in the structure shown in FIG. When a voltage is applied thereto and electrons are applied to reduce, as shown in the lower part of FIG. 8, the bithiophene rotates around the axis, and adjacent 1,3-benzodithiolyl groups are oxidized and reduced. Bonding by reaction and further aligning the liquid crystalline functional group results in a state in which long molecules are folded. For this reason, it is possible to increase the degree of deformation (deformation rate) and to give directionality to the deformation.
In such a stimulus-responsive compound polymer, the stimulus-responsive compound constituting the polymer is preferably polymerized via a double bond or cyclohexane. Thereby, the mobility (orientation) of the stimuli-responsive compound to be formed can be improved while maintaining the direction of deformation, and the deformation rate can be further increased.

<Third Embodiment>
Next, a detailed description will be given of a third embodiment of the stimulus-responsive compound whose molecular structure is changed by an oxidation-reduction reaction.
FIG. 9 is a diagram for explaining the molecular structure before and after the redox reaction of the stimulus-responsive compound of this embodiment. In FIG. 9, ◯ and □ represent functional groups, and the lines represent bonds.

As shown in FIG. 9 (a), the stimuli-responsive compound of this embodiment includes a pair of alkyl chains, a cross-linking part that cross-links the alkyl chains, and a liquid crystalline functional group bonded to one of the pair of alkyl chains. have. In the drawing, for easy understanding, one cross-linked portion and one liquid crystalline functional group are shown, but actually there are a plurality of cross-linked portions and liquid crystal functional groups.
As shown in FIG. 9A, the bridging portion has a bond that functions as a rotation axis, and is located at the first group (A _{1 in the} figure) located at one end of the bond and the other end of the bond. A unit A having a _second group (A _{2 in the} figure), a first unit B (B _{1 in the} figure) arranged at the first binding site of the first group, and a second unit And a second unit B (B _{2 in the} figure) arranged at the first binding site of the group.

The unit A has a bond that functions as a rotation axis, and a first group and a second group are bonded to both ends of the bond, respectively. And it can rotate centering on the said connection. By having such a unit, the stimulus-responsive compound can be deformed (displaced).
As the unit A, for example, a group in which two aromatic rings are bonded can be used, and among them, one group selected from the group consisting of the above formulas (1) to (3) is preferable. By using such a group as the unit A, the stimulus-responsive compound can be more smoothly deformed (displaced) and driven at a lower voltage.

The first unit B is bonded to the first binding site of the first group of the unit A as shown in FIG. Moreover, the 2nd unit B is couple | bonded with the 1st coupling | bond part of the 2nd group of the unit A, as shown to Fig.9 (a).
Moreover, the 1st unit B and the 2nd unit B are group which forms a coupling | bonding by unit B by oxidation-reduction reaction (refer FIG.9 (b)). In other words, it is a group that forms a bond by receiving (reducing) electrons from the outside. Further, it is a group that releases bonds by releasing (oxidizing) electrons to the outside.

  The unit B (the first unit B and the second unit B) is particularly a group that forms a bond by oxidation-reduction reaction between the units B (the first unit B and the second unit B). Although not limited, the unit B (the first unit B and the second unit B) is preferably a group represented by the above formula (4). Thereby, the coupling | bonding state and non-bonding state of units B can be made to reversibly and easily advance by adjusting reaction conditions. Moreover, since the reactivity is high, the stimulus-responsive compound can be deformed more smoothly and at a low voltage.

Moreover, as shown in FIG. 9A, the stimulus-responsive compound has a liquid crystalline functional group. This liquid crystalline functional group exhibits a certain alignment by using a liquid crystal alignment technique. For this reason, a rapid response compound has a fixed directionality in the drive.
The liquid crystalline functional group is not particularly limited as long as it is a group exhibiting liquid crystallinity, and a group having a plurality of ring structures, for example, a group in which a plurality of phenyl groups are linked by an ester group, a benzene ring or a cyclohexane ring is directly linked. The thing which was done is mentioned.

As the liquid crystalline functional group, it is particularly preferable to use a group in which one or more halogen atoms are bonded to one ring structure among a plurality of ring structures. Thereby, the movement performance at the time of alignment of a liquid crystalline functional group can be made higher, and the speed | rate of transfer to alignment becomes quicker. As a result, the stimulus-responsive compound can be deformed (displaced) more quickly and smoothly, and is driven at a lower voltage.
In addition, although this embodiment demonstrated the case where the liquid crystalline functional group was couple | bonded with only one alkyl chain, it is not limited to this, You may couple | bond with both the alkyl chains.
Specific examples of the liquid crystal functional group include the following.

  As described above, the stimulus-responsive compound of the present embodiment includes the pair of alkyl chains, the unit A capable of rotating the shaft as described above, and the unit B capable of forming a bond between the units by an oxidation-reduction reaction. It has a feature in that it has a cross-linked portion provided with (first unit B and second unit B) and a liquid crystalline functional group. By having such a feature, it can be deformed (displaced) with low power, and the degree of displacement can be made relatively large. This is considered to be due to the following reasons.

  That is, a plurality of stimuli-responsive compound molecules can exist in an aligned (aligned) state by a liquid crystalline functional group, and by applying a voltage or the like in the aligned state, the unit A rotates, Units B in one molecule are bonded (crosslinked) by a redox reaction. In this way, from the state shown in FIG. 9 (a) to the state shown in FIG. 9 (b) by utilizing the orientation (liquid crystallinity) of the liquid crystalline functional group and the binding property by stimulation of the unit B. It can be reliably deformed (displaced). In particular, since the alignment of the liquid crystal functional groups and the bonding between the units B proceed at a low voltage, a large deformation (displacement) is possible at a low voltage.

  The stimulus-responsive compound as described above includes the unit A as described above, the first unit B disposed at the first binding site of the first group of the unit A, and the second group of the unit A. A second unit B disposed at the first binding site; a polymerizable functional group bonded to the second binding site of the first group of unit A and the second binding site of the second group of unit A; And a second monomer having a liquid crystalline functional group and at least one polymerizable functional group can be copolymerized at an arbitrary ratio.

Although it does not specifically limit as a polymerizable functional group, It is preferable that it is at least 1 sort (s) selected from the group which consists of a vinyl group, an acryl group, and a methacryl group. Thereby, a stimulus responsive compound can be obtained more easily. Moreover, the motility of the obtained stimulus-responsive compound can be made high, and the degree of deformation (deformation rate) can be made higher.
Specific examples of the first monomer include the following formulas (9) to (11).

  Specific examples of the second monomer include the following formulas (13) to (15).

<Fourth embodiment>
Next, a fourth embodiment of the stimulus-responsive compound whose molecular structure is changed by a redox reaction will be described in detail.
FIG. 10 is a diagram for explaining the molecular structure before and after the oxidation-reduction reaction of the stimulus-responsive compound of this embodiment. In FIG. 10, ◯ and □ represent functional groups, and the lines represent bonds.

As shown in FIG. 10, the stimulus-responsive compound of the present embodiment connects a plurality of deformable groups whose molecular structure is deformed, a plurality of liquid crystal functional groups having liquid crystallinity, and a deformable group and a liquid crystal functional group. A plurality of linking groups.
The deformable group is a group whose molecular structure is deformed by an oxidation-reduction reaction, and has a bond that functions as a rotation axis and is located at one end of the bond as shown in FIG. (A _{1 in the} figure), a unit A having a _second group (A _{2 in the} figure) located at the other end of the bond, and a first disposed at the first binding site of the first group. Unit B (B _{1 in the} figure) and a second unit B (B _{2 in the} figure) arranged at the first binding site of the second group.

The unit A has a bond that functions as a rotation axis, and a first group and a second group are bonded to both ends of the bond, respectively. And it can rotate centering on the said connection. By having such a unit, the stimulus-responsive compound can be deformed (displaced).
As the unit A, for example, a group in which two aromatic rings are bonded can be used, and among them, one group selected from the group consisting of the above formulas (1) to (3) is preferable. By using such a group as the unit A, the stimulus-responsive compound can be more smoothly deformed (displaced) and driven at a lower voltage.

As shown in FIG. 10A, the first unit B is bonded to the first binding site of the first group (A ₁ ) of the unit A. The second unit B, as shown in FIG. 10 (a), bound to the first binding site of the second group of units A (A _2).
Moreover, the 1st unit B and the 2nd unit B are group which forms a coupling | bonding by unit B by oxidation-reduction reaction (refer FIG.10 (b)). In other words, it is a group that forms a bond by receiving (reducing) electrons from the outside. Further, it is a group that releases bonds by releasing (oxidizing) electrons to the outside.

  The unit B (the first unit B and the second unit B) is particularly a group that forms a bond by oxidation-reduction reaction between the units B (the first unit B and the second unit B). Although not limited, the unit B (the first unit B and the second unit B) is preferably a group represented by the above formula (4). Thereby, the coupling | bonding state and non-bonding state of units B can be made to reversibly and easily advance by adjusting reaction conditions. Moreover, since the reactivity is high, the stimulus-responsive compound can be deformed more smoothly and at a low voltage.

Moreover, the stimulus-responsive compound has a liquid crystalline functional group as shown in FIG. This liquid crystalline functional group exhibits a certain alignment by using a liquid crystal alignment technique. For this reason, a rapid response compound has a fixed directionality in the drive.
The liquid crystalline functional group is bonded to a linking group described later at both ends, and the second bonding site of the first group of the above-described deformable group and the second group of the second group are connected through the linking group. It is connected to the binding site.

The liquid crystalline functional group is not particularly limited as long as it is a group exhibiting liquid crystallinity, and a group having a plurality of ring structures, for example, a group in which a plurality of phenyl groups are linked by an ester group, a benzene ring or a cyclohexane ring is directly linked. The thing which was done is mentioned.
As the liquid crystalline functional group, it is particularly preferable to use a group in which one or more halogen atoms are bonded to one ring structure among a plurality of ring structures. Thereby, the movement performance at the time of alignment of a liquid crystalline functional group can be made higher, and the speed | rate of transfer to alignment becomes quicker. As a result, the stimulus-responsive compound can be deformed (displaced) more quickly and smoothly, and is driven at a lower voltage.
Specific examples of the liquid crystalline functional group include those represented by the above formula (8).
The connecting group that connects the deformable group and the liquid crystalline functional group is a group represented by the following formula (12).

By linking using a linking group having such a siloxane bond, the responsiveness of the stimulus-responsive compound to stimulation can be made higher. Moreover, a stimulus-responsive compound as shown in FIG. 10 can be easily produced.
As described above, the stimulus-responsive compound of the present embodiment includes a deformable group that can be deformed by a redox reaction, a liquid crystalline functional group, and a linking group represented by the above formula (12) that connects them. It has the feature in having. By having such a feature, it can be deformed (displaced) with low power, and the degree of displacement can be made relatively large. This is considered to be due to the following reasons.

  That is, in such a stimulus-responsive compound, in an oxidized state, a long molecule exists in an extended state as in the structure shown in FIG. Then, when a voltage is applied thereto and electrons are applied to reduce, the unit A rotates about the rotation axis of the unit A as shown in FIG. Bonding and further aligning the liquid crystalline functional group results in a state in which a long molecule is folded. For this reason, it is possible to increase the degree of deformation (deformation rate) and to give directionality to the deformation. Further, since the oxidation-reduction reaction is used for the deformation, it can be driven with relatively low power.

  The stimulus-responsive compound as described above includes the unit A as described above, the first unit B disposed at the first binding site of the first group of the unit A, and the second group of the unit A. A second unit B disposed at the first binding site; a polymerizable functional group bonded to the second binding site of the first group of unit A and the second binding site of the second group of unit A; A second monomer having a liquid crystalline functional group and two polymerizable functional groups, and a third monomer represented by the following formula (16) in the presence of a catalyst such as platinum, It can manufacture by making it copolymerize in arbitrary ratios.

Although it does not specifically limit as a polymerizable functional group, It is preferable that it is at least 1 sort (s) selected from the group which consists of a vinyl group, an acryl group, and a methacryl group. Thereby, a stimulus responsive compound can be obtained more easily. Moreover, the motility of the obtained stimulus-responsive compound can be made high, and the degree of deformation (deformation rate) can be made higher.
Specific examples of the first monomer include the above formulas (9) to (11).
Specific examples of the second monomer include the above formulas (13) to (15).
As mentioned above, although this invention was demonstrated based on suitable embodiment, this invention is not limited to these.

  DESCRIPTION OF SYMBOLS 10 ... Screen main body 11 ... Reflective film 12 ... Support film 20 ... Actuator 21 ... 1st electrode plate 22 ... 2nd electrode plate 23 ... Actuator main body 24 ... Convex part 100 ... Screen

Claims (9)

A screen for displaying the projected image,
A flexible planar screen body;
A plurality of actuators that are installed on the back side opposite to the display surface that displays the image of the screen body and have convex portions that are formed to be convex toward the back surface;
The actuator is configured to be deformed by electrical stimulation and configured to press the convex portion against the back surface of the screen body.   The screen according to claim 1, wherein one of the actuators has a plurality of convex portions. The actuator is a plate-like member having a longitudinal direction, and an actuator body having the convex portion in the vicinity of one end in the longitudinal direction;
A pair of electrode plates provided at the other end in the longitudinal direction of the actuator main body and installed so as to sandwich the actuator main body,
3. The screen according to claim 1, wherein by applying a voltage to the pair of electrode plates, the actuator body is bent toward the screen body, and the convex portion is pressed against the back surface of the screen body. The pair of electrode plates includes a first electrode plate composed of a plurality of linear conductors arranged in a lattice shape, and a plurality of lines arranged opposite to the first electrode plate and arranged in a lattice shape. A second electrode plate composed of a shaped conductor,
The said actuator main body is clamped between the cross | intersection part where the said conductors of the said 1st electrode plate cross | intersect, and the cross | intersection part where the said conductors of the said 2nd electrode plate cross | intersect. Screen.   The screen according to claim 3 or 4, wherein the actuator body is made of a stimulus-responsive compound whose molecular structure is changed by an oxidation-reduction reaction. The stimulus-responsive compound includes a unit A having a bond that functions as a rotation axis;
A first unit B disposed at a first binding site of the unit A;
A second unit B disposed at a second binding site of the unit A;
A first unit C disposed at a third binding site of the unit A;
A second unit C disposed at a fourth binding site of the unit A;
Including
The first unit B and the second unit B are combined by a redox reaction,
The screen according to claim 5, wherein the first unit C and the second unit C have liquid crystallinity and include a polymerizable functional group. The stimulus-responsive compound includes a unit A having a bond that functions as a rotation axis;
A first unit B disposed at a first binding site of the unit A;
A second unit B disposed at a second binding site of the unit A;
A first unit C coupled to the first unit B;
A second unit C coupled to the second unit B;
Have
The first unit B and the second unit B are bonded by an oxidation-reduction reaction,
The screen according to claim 5, wherein the first unit C and the second unit C have liquid crystallinity. A pair of alkyl chains;
A cross-linking part that cross-links between the pair of alkyl chains;
A liquid crystalline functional group bonded to at least one of the pair of alkyl chains,
The bridging portion has a bond that functions as a rotation axis, and has a first group located at one end of the bond and a second group located at the other end of the bond;
A first unit B disposed at a first binding site of the first group;
A second unit B disposed at a first binding site of the second group,
The bridging part is bonded to one alkyl chain at the second binding site of the first group, and bonded to the other alkyl chain at the second binding site of the second group;
The screen according to claim 5, wherein the first unit B and the second unit B are combined by an oxidation-reduction reaction. A plurality of deformable groups whose molecular structure is deformed by a redox reaction;
A plurality of liquid crystal functional groups having liquid crystal properties;
A plurality of linking groups represented by the following formula (12) for linking the deformable group and the liquid crystalline functional group;
The deformable group has a bond that functions as a rotating shaft, and has a first group located at one end of the bond and a second group located at the other end of the bond;
A first unit B disposed at a first binding site of the first group;
A second unit B disposed at a first binding site of the second group,
The deformable group is bonded to the linking group at a second binding site of the first group and a second binding site of the second group;
The screen according to claim 5, wherein the first unit B and the second unit B are combined by an oxidation-reduction reaction.

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