KR20140038867A - Microlens array film and display device having the same - Google Patents

Abstract

The present invention provides a micro lens array film and a display device comprising the same. The micro lens array film comprises: a first and a second transparent electrodes facing each other; and a flexible polymer membrane interposed between the first and the second transparent electrodes. By adjusting voltage applying on the transparent electrodes, shapes of lens can be freely transformed.

Description

Microlens array film and display device having the same {Microlens array film and display device having the same}

The present invention relates to a microlens array film and a display device including the same.

With the development of display technologies used in various types of terminals, projectors, and TVs, such as mobile phones, navigation, digital information displays (DID), and tablets, which are currently being released, it is possible to provide not only a high resolution screen but also a virtual screen or a 3D image. . The virtual screen technology uses a laser light source, a micro mirror array, and a micro lens array-based project method, and currently uses infrared sensor linkage to enable location recognition when a user approaches or touches a specific part of the virtual screen, thereby enabling computer and mobile. It has been applied to the development of a virtual keyboard that can solve the touch error that can occur due to the miniaturization of the terminal or the inconvenience of writing documents and characters. In addition, the three-dimensional image is mainly implemented through a stereoscopic method that provides a three-dimensional effect by realizing the perspective caused by the parallax of the image recognized by both eyes, but the method of realizing a three-dimensional image with a sense of depth of the front Therefore, there is a technical limitation that the degree of stereoscopic feeling is clearly distinguished according to the viewing angle of the image, and there is a disadvantage in that it may cause eye fatigue and dizziness of viewers viewing the 3D screen implemented by the present method. On the other hand, hologram technology is a method for realizing omnidirectional three-dimensional effect equivalent to the real-life of an object, and has recently emerged as a 3D display can be realized without wearing additional equipment.

It is essential to use a microlens array designed for each purpose in order to realize a virtual screen or a 3D image similar to the real life on a variety of electronic devices, and use a passive lens layer having a standardized specification according to the purpose. have. Currently, micro lens structures are manufactured by various methods such as laser dry induction etching, polymer material reflow, photolithography using diffuser, laser chemical vapor deposition and focused ion beam (FIB) milling. . Among them, the method using the reflow phenomenon is advantageous to manufacture lenses of various sizes, is easy to control, low production cost, and simple to process. The method uses photolithography to create a photoresist cylinder pattern on a substrate and heat the structure to produce a spherical lens shape based on surface tension. However, it is weak against heat and impact and loses durability. There is a disadvantage that flexibility is not guaranteed and is greatly affected by the external environment. In order to overcome such disadvantages, a method of transferring a lens-like structure to a substrate by dry etching (RIE) and an imprinting method using a PDMS mold and a UV cured polymer are used. However, since the former has problems with surface roughness and surface roughness after using RIE, additional polishing process is required, and the former can be applied only to the manufacture of passive lenses, and it is still difficult to manufacture a micro lens array with flexibility in terms of structure materials. There is this.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flexible micro lens array film capable of shape reconstruction and a display device including the same.

The microlens array film according to the present invention for achieving the above object, the first transparent electrode and the second transparent electrode facing each other; And a flexible polymer film interposed between the first transparent electrode and the second transparent electrode, wherein at least one of the first transparent electrode and the second transparent electrode is flat.

In one example, the flexible polymer film may have a first surface facing each other and a flat second surface and a concave-convex structure. The second transparent electrodes may be spaced apart from each other in a plurality, and cover the convex surfaces of the second surface. The first transparent electrode may be spaced apart from each other in plurality, and may overlap each of the convex portions of the second surface.

At least one of the first and second transparent electrodes may be flexible.

In another example, the micro lens array film, the first substrate in contact with at least the lower surface of the flexible polymer film; And a second substrate that is in contact with at least an upper surface of the flexible polymer film.

As a specific example, the first transparent electrode, the flexible polymer film and the second transparent electrode constitute a single unit operation part, the micro lens array film is a plurality of spaced apart from each other between the substrate and the second substrate It may include four unit operating parts. In this case, at least one of the first transparent electrode and the second transparent electrode may extend to cover at least one of an upper surface of the substrate and a lower surface of the second substrate.

As another specific example, the first transparent electrode, the flexible polymer film, and the second transparent electrode constitute a single unit operation unit of a slit type, and the micro lens array film includes a plurality of sub units that constitute one unit operation unit. Includes the operating portion, the height of the upper end of the flexible polymer membrane adjacent to the center of the unit operating unit may be higher than the height of the upper end of the flexible polymer membrane adjacent to the edge of the unit operating unit.

The first substrate may be transparent and flexible.

When a voltage having a sign opposite to each other is applied to the first and second transparent electrodes, the flexible polymer layer may be concave sideways. Alternatively, when a voltage having a sign opposite to each other is applied to the first and second transparent electrodes, the width of the flexible polymer film adjacent to the second substrate may be smaller than the width of the flexible polymer film adjacent to the first substrate. .

The micro lens array film may further include a reflective film covering the first transparent electrode or the second transparent electrode.

The micro lens array film may further include a flexible optical device layer in contact with an upper surface or a lower surface of the flexible polymer film.

The distance between the first transparent electrode and the second transparent electrode may be narrowed by applying voltages having opposite signs to the first transparent electrode and the second transparent electrode, respectively.

According to another aspect of the present invention, there is provided a display apparatus including the chroma lens array film; And a light source unit adjacent to the micro lens array film.

The light source unit may include a light source element, an optical waveguide adjacent to the light source element, and a mirror disposed in the optical waveguide.

The display device may further include a condenser lens unit spaced apart from the light source unit with the microlens array film therebetween and condensing light exiting through the microlens array film.

The display device may further include a reflective plate spaced apart from the light source unit with the micro lens array film therebetween.

The display device may further include a reflective film covering an upper surface of the micro lens array film.

At least the micro lens array film may be flexible.

In the microlens array film according to the present invention, the shape of the lenses (unit operating parts) can be freely modified by adjusting the voltage applied to the transparent electrodes. This makes it possible to realize a flexible and reconfigurable micro lens array film. This micro lens array film is applicable to a virtual display device or a three-dimensional display device.

1 is a cross-sectional view of a micro lens array film according to an embodiment of the present invention.
2 to 4 show deformations when voltage is applied to the micro lens array film of FIG. 1.
5 through 7 are cross-sectional views of micro lens array films according to the modifications of FIG. 1.
8 is a cross-sectional view of a micro lens array film according to another embodiment of the present invention.
9 and 10 show modified shapes when voltage is applied to the microlens array film of FIG. 8.
11 to 13 are cross-sectional views of the microlens array film according to the modifications of FIG. 8.
FIG. 14 illustrates a modified state when a voltage is applied to the microlens array film of FIG. 13.
15 is a cross-sectional view of a micro lens array film according to another embodiment of the present invention.
FIG. 16 illustrates a state in which voltage is changed when a voltage is applied to the microlens array film of FIG. 15.
17 is a schematic perspective view of a display device according to an embodiment of the present invention.
18 to 24 are cross-sectional views of display apparatuses according to other examples.
24 to 26 are perspective views illustrating display apparatuses according to still other examples of the present invention.
27 and 28 are perspective views illustrating display apparatuses according to other examples.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Further, in the drawings, the thickness of the components is exaggerated for an effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional views and / or plan views that are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are generated according to the manufacturing process. For example, the etched area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific forms of regions of the elements and are not intended to limit the scope of the invention. Although the terms first, second, etc. have been used in various embodiments of the present disclosure to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. The embodiments described and exemplified herein also include their complementary embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprise" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a cross-sectional view of a micro lens array film according to an embodiment of the present invention.

Referring to FIG. 1, the microlens array film 100 according to the present embodiment may include a first transparent electrode 15a and a second transparent electrode 15b facing each other, and a flexible polymer film 20 disposed therebetween. Include. The transparent electrodes 15a and 15b may be formed of a material such as silver nanowires, carbon nanotubes, graphene, or the like as the nanoelectrode material. Alternatively, the transparent electrodes 15a and 15b may be formed of ITO, IZO, ZnO, SnO 2, antimony-doped tin oxide (ATO), Al-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), TiO 2 and FTO ( It may be formed of at least one material selected from the group containing fluorine-doped tin oxide. In the present embodiment, it is preferable that at least the second transparent electrode 15b has flexibility. The flexible polymer film 20 is preferably formed of a transparent material of an electroactive polymer material. In the present embodiment, the lower surface of the flexible polymer film 20 is flat while the upper surface thereof has an uneven structure. The first electrode 15a may be in contact with the entire surface of the lower surface of the flexible polymer film 20. The second electrode 15b may be spaced apart from each other in plurality and may cover convex portions of the upper surface of the flexible polymer film 20, respectively. One convex node of the flexible polymer membrane 20 and the second and first electrodes 15b and 15a respectively covering the upper and lower surfaces thereof may constitute one unit operation unit U1.

2 to 4 show deformations when voltage is applied to the micro lens array film of FIG. 1.

1 to 4, voltages having opposite signs to each other are applied to the first and second transparent electrodes 15a and 15b, respectively. For example, when a positive voltage is applied to the first transparent electrode 15a, a negative voltage may be applied to the second transparent electrode 15b. Then, the gap between the first and second transparent electrodes 15a and 15b is narrowed by the electrostatic force generated between the upper and lower surfaces of the flexible polymer film 20, so that the flexible polymer film 20 is shown in FIG. The thickness between the top end and the bottom of the) is reduced from T1 to T2. In this case, the recessed portion of the flexible polymer film 20 which is not covered between the second transparent electrodes 15b may protrude convexly as shown in FIG. 3. If different voltages are applied to the second transparent electrodes 15b, the flexible polymer film 20 may have a different thickness for each position as shown in FIG.

As such, in the microlens array film 100 according to the present exemplary embodiment, the shape of the lens array may be freely deformed or reproducible by adjusting the voltage applied to the transparent electrodes 15a and 15b.

5 through 7 are cross-sectional views of micro lens array films according to the modifications of FIG. 1.

Referring to FIG. 5, in the microlens array film 101 according to the present example, the plurality of first transparent electrodes 15a may be spaced apart from each other and overlap the convex portions of the flexible polymer film 20. The second transparent electrode 15b may cover the entire surface of the upper surface of the uneven structure of the flexible polymer film 20. Other configurations and operations may be the same as or similar to those described with reference to FIGS. 1 to 4.

6, in the microlens array film 102 according to the present example, the first transparent electrode 15a covers the entire surface of the lower surface of the flexible polymer film 20 and the second transparent electrode 15b is the flexible polymer film. The front surface of the upper surface of the 20 can be covered. In this case, the deformation as shown in FIG. 4 may be difficult. Other configurations and operations may be the same as or similar to those described with reference to FIGS. 1 to 3.

Alternatively, referring to FIG. 7, in the microlens array film 103 according to the present example, the first transparent electrodes 15a may be spaced apart from each other and overlap the convex portions of the flexible polymer film 20. A plurality of second electrodes 15b may be spaced apart from each other and cover convex portions of the upper surface of the flexible polymer film 20, respectively. Other configurations and operations may be the same as or similar to those described with reference to FIGS. 1 to 4.

8 is a cross-sectional view of a micro lens array film according to another embodiment of the present invention.

Referring to FIG. 8, the microlens array film 104 according to the present exemplary embodiment includes a first substrate 10 and a second substrate 30 facing each other. A plurality of flexible polymer patterns 20a are disposed to be spaced apart from each other between the first substrate 10 and the second substrate 30. One sidewall of each of the polymer patterns 20a contacts the first transparent electrode 15a and the other sidewall contacts the second transparent electrode 15b. Upper surfaces of the first and second transparent electrodes 15a and 15b and the flexible polymer patterns 20a are in contact with the second substrate 30 at the same time, and lower surfaces of the first and second transparent electrodes 15a and 15b are simultaneously exposed to the first substrate 10. Contact with An upper surface of the first substrate 10 between the flexible polymer patterns 20a may be covered with the first and second transparent electrodes 15a and 15b. The lower surface of the second substrate 30 between the flexible polymer patterns 20a may be exposed without being covered with the first and second transparent electrodes 15a and 15b. Both the first and second substrates 10, 30 are preferably transparent. At least the second substrate 30 may be flexible. The first substrate 10 may not be flexible. The second substrate 30 may be made of the same material as the flexible polymer patterns 20a. The first substrate 10 and the second substrate 30 is a stretchable polymer material and can be attached and detached without restriction on the shape of a structure or a human body, and may have harmless material properties even when directly attached to the human body. The first and second transparent electrodes 15a and 15b may have elasticity.

The flexible polymer patterns 20a may be formed of the same material as the flexible polymer layer 20 of FIG. 1. One convex node of the flexible polymer membrane 20 and the second and first electrodes 15b and 15a respectively covering the upper and lower surfaces thereof may constitute one unit operation unit U1. One flexible polymer pattern 20a and the first and second electrodes 15a and 15b respectively covering the sidewalls thereof may constitute one unit operation unit U1. Other configurations may be the same as or similar to those described with reference to Fig.

9 and 10 show modified shapes when voltage is applied to the microlens array film of FIG. 8.

9 and 10, as described with reference to FIG. 2, voltages having opposite signs are applied to the first and second transparent electrodes 15a and 15b, respectively. The gap between the first and second transparent electrodes 15a and 15b is narrowed by the electrostatic force, and the flexible polymer pattern 20a may protrude upward. As a result, the surface of the second substrate 30 may have an uneven structure. In this case, since the first substrate 10 is not flexible and the lower portions of the first and second transparent electrodes 15a and 15b are fixed to cover the upper surface of the first substrate 10 as shown in FIG. 8, As illustrated in FIG. 9, upper ends of the first and second transparent electrodes 15a and 15b may be close to each other. Alternatively, as shown in FIG. 10, the gaps between the upper and lower ends of the first and second transparent electrodes 15a and 15b may be kept constant, while the middle portions may be concave.

11 to 13 are cross-sectional views of the microlens array film according to the modifications of FIG. 8. FIG. 14 illustrates a modified state when a voltage is applied to the microlens array film of FIG. 13.

Referring to FIG. 11, in the microlens array film 105 according to the present example, an upper surface of the first substrate 10 between the flexible polymer patterns 20a may be formed of the first and second transparent electrodes 15a. 15b), but not exposed. The lower surface of the second substrate 30 between the flexible polymer patterns 20a may be covered with the first and second transparent electrodes 15a and 15b.

12, in the microlens array film 106 according to the present example, an upper surface of the first substrate 10 and a lower surface of the second substrate 30 between the flexible polymer patterns 20a are provided. Both may be covered with the first and second transparent electrodes 15a and 15b.

Alternatively, referring to FIG. 13, in the microlens array film 107 according to the present example, an upper surface of the first substrate 10 and a lower surface of the second substrate 30 between the flexible polymer patterns 20a are provided. Both may be exposed without being covered with the first and second transparent electrodes 15a and 15b. When a voltage is applied to the microlens array film 107 according to the present example, the shapes of the flexible polymer patterns 20a may be changed as shown in FIG. 9 or 10. Alternatively, as shown in FIG. 14, the widths of the flexible polymer patterns 20a may be reduced evenly from W1 to W2 regardless of the height.

15 is a cross-sectional view of a micro lens array film according to another embodiment of the present invention.

Referring to FIG. 15, in the microlens array film 108 according to the present embodiment, the first and second transparent electrodes 15a and 15b and the flexible polymer pattern 20a interposed therebetween have one slit ( A sub unit operating unit SU1 of a slit type is configured. A plurality of sub unit operation units SU1 may be assembled to form one unit operation unit U1. The sub-stage actuators SU1 may be spaced apart from each other. The unit operating units U1 may be spaced apart from each other. In FIG. 15, the first and second transparent electrodes 15a and 15b are shown to cover only the sidewalls of the flexible polymer pattern 20a, but are extended as described with reference to FIGS. 8, 11 and 12 to extend the first and second electrodes. At least one of the two substrates 10 and 30 may be covered. Other configurations may be the same as or similar to those described with reference to FIG. 8.

FIG. 16 illustrates a state in which voltage is changed when a voltage is applied to the microlens array film of FIG. 15.

Referring to FIG. 16, shapes of each of the flexible polymer patterns 20a are modified by applying different voltages to the first and second transparent electrodes 15a and 15b included in the sub unit operation unit SU1. As a result, the second substrate 30 may be formed to have an uneven structure. In this case, the height of the upper end of the flexible polymer pattern 20a disposed at the center of the sub unit operation unit SU1 may be higher than the height of the upper end of the flexible polymer pattern 20a disposed at the edge of the sub unit operation unit SU1. Can be.

17 is a schematic perspective view of a display device according to an embodiment of the present invention.

Referring to FIG. 17, the display device 201 according to the present example includes the micro lens array films 100 to 108 described with reference to FIGS. 1 to 16. The display device 201 may further include a light source unit 120, a condenser lens unit 125, and a created surface 130. The micro lens array films 100 to 108 may be configured to be positioned between the light source unit 120 and the condenser lens unit 125 according to a purpose of use, or may be configured to be linked only to the light source unit 120. When the microlens array films 100 to 108 are interlocked with the light source unit 120 and the condenser lens unit 125, a display having uniform illuminance on the surface 130 is possible even when a light source having an uneven illuminance is used. It can serve as an optical modulator to enable, it is also possible to use in conjunction with the two-layer or multilayer micro lens array film (100 ~ 108) according to the purpose. In addition, the microlens array films 100 to 108 are capable of actively changing the shape of individual lenses, thereby enabling active light transmission path control and preventing display distortion from being affected by the shape and angle of the surface 130. It is also possible actively. At this time, the condensing lens capable of active shape deformation can be applied using the electroactive polymer which is the material of the microlens array films 100 to 108, thereby replacing the condensing lens unit 125. Alternatively, a flexible structure in which the light source unit 120, the micro lens array films 100 to 108, and the condenser lens unit 125 are integrated may also be formed, which may be effective in preventing display distortion and display distortion having a uniform illuminance. In addition to the display, the application is advantageous when a distorted shape display such as a virtual keyboard or other virtual input device is fatal. In addition, the present micro lens array film (100 ~ 108) is possible to reconfigure the lens arrangement and size can be actively changed to a variety of structures in accordance with the purpose of use of the lens structure 3D when integrated or interlocked with the light source unit 120 Implementation of the display is possible.

When the light source unit 120 is integrated with the micro lens array films 100 to 108, the light source unit 120 may be designed to be reflective or transmissive according to the use of the lens. The method of transferring position and light to the lens can also vary. The light source may use a light emitting diode or a laser diode or various light emitting material based devices corresponding thereto.

18 to 24 are cross-sectional views of display apparatuses according to other examples.

Referring to FIG. 18, the display device 202 according to the present example includes a light source unit 120 disposed below the micro lens array film 100 of FIG. 1. The light source unit 120 may include a coupling member 35, a light source element 40, and a light source substrate 45. The coupling member 35 may be, for example, a transparent adhesive. The light source element 40 may be a variety of LED lights. The light source substrate 45 may be used as an optical waveguide.

Alternatively, referring to FIG. 19, in the display apparatus 203 according to the present example, an optical waveguide 50 may be formed in the light source substrate 45. The light source device 40 may be disposed on one side of the optical waveguide 50. The mirror 55 may be disposed on the other side of the optical waveguide 50. In this case, the light may be generated from the light source element 40 and travel along the optical waveguide 50, and then may be reflected by the mirror 55 to follow a dotted arrow through the micro lens array film 100. Other configurations may be the same as or similar to those described with reference to FIG. 18.

Alternatively, referring to FIG. 20, in the display device 204 according to the present example, the light source unit 120 described with reference to FIG. 18 may be disposed under the micro lens array film 107 of FIG. 14.

Alternatively, referring to FIG. 21, in the display apparatus 205 according to the present example, the reflective film 17 may be formed on the top surface of the micro lens array film 100 in the same state as that of FIG. 19. The reflective film 17 may be formed of, for example, a metal having good reflection of light. At this time, the light is generated from the light source element 40 and travels along the optical waveguide 50, is reflected by the mirror 55, is incident into the micro lens array film 100, and is reflected by the reflective film 17. You can follow the dotted arrow.

Or referring to FIG. 22, the display device 206 according to the present example includes a micro lens array film as shown in FIG. 14 and a flexible optical device layer 50a interposed therein. That is, the optical device layer 50a may be interposed between the second substrate 30 and the unit operating unit U1. The optical device layer 50a may be, for example, a flexible optical fiber. The light source device 40 may be disposed on one side of the optical device layer 50a.

Or, referring to FIG. 23, in the display apparatus 207 according to the present example, the microlens array film 107 is disposed on the light source unit 120, and the reflective film 17 is disposed on the microlens array film 107. .

The microlens array film disposed on the light source unit 120 may be varied as described with reference to FIGS. 1 to 16.

24 to 26 are perspective views illustrating display apparatuses according to still other examples of the present invention.

24 to 26, the display devices 208 to 210 according to the present examples may respectively include a light source unit 120, a micro lens array film 100 to 108, and a reflector 140 that are sequentially disposed on the substrate 110. It includes. Light generated from the light source unit 120 is incident on the reflecting plate 140 through the micro lens array films 100 to 108 along the dotted line arrow, and the reflecting plate 140 reflects and shows it on an imaginary plane. Display devices 150 to 170 may be implemented. The virtual display devices 150 to 170 of FIG. 24 may be a virtual keyboard 150, a virtual instrument 160, and a control keypad 170 for a virtual game, respectively. As such, projection of various virtual displays is possible. The microlens array film enables active selective activation and lens size control, enabling focal length and phase adjustment for effective implementation of virtual displays. In addition, if the light source device array and the micro lens array have a 1: 1 matching structure in pixel form, a high resolution virtual display may be realized. When the sensor for position sensing is mounted on the structure, user touch interaction is possible on the virtual display. In addition, because it uses a flexible and flexible material, it can be attached to a part of the body or to a structure having curvature.

27 and 28 are perspective views illustrating display apparatuses according to other examples.

Referring to FIG. 27, the display device 211 according to the present example is a substrate 110 and an object 135 and a micro lens array film 100 to be placed on the substrate 110 and implemented as a virtual three-dimensional display. 108 and a light source element 40 disposed on one side thereof. Since the shape of the micro lens array films 100 to 108 may be reconfigured, an image of the object 135 may be three-dimensionally represented in space through an active configuration and combination of a lens (unit operating unit).

Referring to FIG. 28, in the display device 212 according to the present example, the light source unit 120 in which the light source element 40 is positioned is disposed under the micro lens array films 100 to 108. By activating only some lenses (unit operating units) at the edges of the micro lens array films 100 to 108, the images may be three-dimensionally displayed in space. The light source unit 120 and the micro lens array films 100 to 108 may have flexibility. As a result, the active lens structure can be actively changed according to the shape change of the structure when attached to a part of the body or a structure having a curvature, and thus it is applicable to the 3D image implementation of the display of the wearable and skin patch type electronic devices.

As such, the microlens array films 100 to 108 of the present invention can implement a three-dimensional display in conjunction with the light source unit 120, and in particular, a hologram that can solve the disadvantage of the conventional stereoscopic three-dimensional display. Application to the display method is possible.

Claims (20)

A first transparent electrode and a second transparent electrode facing each other; And
It includes a flexible polymer film interposed between the first transparent electrode and the second transparent electrode,
At least one of the first transparent electrode and the second transparent electrode is flat microlens array film. The method according to claim 1,
The flexible polymer film is opposed to each other and has a flat first surface and the second surface of the uneven structure,
The second transparent electrode is spaced apart from each other in a plurality, the microlens array film covering each of the convex surfaces of the second surface. The method according to claim 1,
The flexible polymer film is opposed to each other and has a flat first surface and the second surface of the uneven structure,
The first transparent electrode is spaced apart from each other in a plurality, the microlens array film overlapping each of the convex portions of the second surface. The method according to claim 1,
At least one of the first and second transparent electrodes is a flexible micro lens array film. The method according to claim 1,
A first substrate in contact with at least a lower surface of the flexible polymer film; And
A microlens array film further comprising a flexible second substrate in contact with at least an upper surface of the flexible polymer film. 6. The method of claim 5,
The first transparent electrode, the flexible polymer film and the second transparent electrode constitute a unit operation unit,
The microlens array film includes a plurality of unit operating portions disposed to be spaced apart from each other between the substrate and the second substrate. The method according to claim 6,
At least one of the first transparent electrode and the second transparent electrode is extended to cover at least one of the upper surface of the substrate and the lower surface of the second substrate. 6. The method of claim 5,
The first transparent electrode, the flexible polymer film and the second transparent electrode constitute a single unit operation unit having a slit shape,
The micro lens array film includes a plurality of sub unit operation units constituting one unit operation unit,
And a height of an upper end of the flexible polymer film adjacent to the center of the unit operating part is higher than a height of an upper end of the flexible polymer film adjacent to the edge of the unit operating part. 6. The method of claim 5,
The first substrate is a transparent and flexible micro lens array film. 6. The method of claim 5,
The flexible polymer film is concave sideways when a voltage having a sign opposite to each other is applied to the first and second transparent electrodes, respectively. 6. The method of claim 5,
When a voltage having a sign opposite to each other is applied to the first and second transparent electrodes, the width of the flexible polymer film adjacent to the second substrate is narrower than the width of the flexible polymer film adjacent to the first substrate. film. The method according to claim 1,
And a reflective film covering the first transparent electrode or the second transparent electrode. The method according to claim 1,
Micro lens array film in contact with the upper surface or the lower surface of the flexible polymer film further comprises a flexible optical device layer. The method according to claim 1,
The microlens array film of claim 1, wherein a voltage having a sign opposite to each other is applied to the first transparent electrode and the second transparent electrode to narrow the gap between the first transparent electrode and the second transparent electrode. Claim 1 microlens array film; And
And a light source unit adjacent to the micro lens array film. 16. The method of claim 15,
And the light source unit comprises a light source element, an optical waveguide adjacent to the light source element, and a mirror disposed in the optical waveguide. 16. The method of claim 15,
And a condensing lens unit spaced apart from the light source unit with the microlens array film therebetween and condensing light exiting through the microlens array film. 16. The method of claim 15,
And a reflection plate spaced apart from the light source unit with the microlens array film interposed therebetween. 16. The method of claim 15,
And a reflective film covering an upper surface of the micro lens array film. 20. The method of claim 19,
At least the micro lens array film is a flexible display device.

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