KR101057769B1 - Lens array for image conversion and image display device and method using same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image conversion lens array and an image display apparatus and method using the same for modulating a path of light using polar liquids and nonpolar liquids to display planar images and stereoscopic images.

The lens array for image conversion according to the embodiment of the present invention includes a plurality of cells in which a polar liquid and a non-polar liquid are contained between the first and second substrates, and a first formed on the first substrate so as to correspond to each of the plurality of cells. A first hydrophilic insulating film formed on the first substrate and covering the first electrodes to block contact between the first electrodes and the polar liquid and the nonpolar liquid, and a polar liquid and a nonpolar liquid. Second electrodes formed on the first hydrophilic insulating layer so as to separate the plurality of cells, and formed on a wall surface of the second electrodes, the second electrodes and the polar liquid and the nonpolar liquid. A second hydrophilic insulating film which blocks the contact of the light source and an electrical signal supplied to the first and second electrodes to control the path of light passing through the polar liquid And a controller for converting the 2D image represented by the light into either a 3D image or a 2D image, wherein the first and second electrodes supply the electrical signal to the polar liquid, and the first and second The hydrophilic insulating film is characterized by insulating between the polar liquid and the electrodes.

By this configuration, the present invention converts the path of light depending on the presence or absence of the voltage supplied to the polar liquid. Therefore, the observer observes the path of the light converted by the lens array to observe the image displayed on the display device in two or three dimensions.

Description

Lens array for image conversion and image display device and method using same {LENS ARRAY FOR IMAGE CONVERSION AND DEVICE AND METHOD IMAGE DISPLAY USING THE SAME}             

1 is a diagram showing a principle of recognition of a three-dimensional image.

2 is a view showing a conventional stereoscopic image display device.

FIG. 3 is a diagram illustrating a recognition principle of a three-dimensional image of the stereoscopic image display device shown in FIG. 2;

4 is a view showing a principle of recognition of a three-dimensional image of another conventional stereoscopic image display device.

5 is a perspective view illustrating an image conversion lens array and an image display apparatus using the same, according to an exemplary embodiment.

FIG. 6 is a cross-sectional view illustrating an image conversion lens array and an image display apparatus using the same according to an exemplary embodiment of the present invention shown in FIG. 5. FIG.

7 is a view showing a state change of the polar liquid used in the electrowetting phenomenon shown in FIG.

FIG. 8 is a view showing an optical path when no voltage is supplied to the polar liquid shown in FIG. 5; FIG.                 

9 is a view showing recognition of a two-dimensional image by the lens array for image conversion and the image display device and method using the same according to an embodiment of the present invention.

10 is a view showing an optical path when a voltage is supplied to the polar liquid shown in FIG.

11 is a view showing recognition of a three-dimensional image by the lens array for image conversion according to an embodiment of the present invention and an image display apparatus and method using the same.

12 is a diagram illustrating an image conversion lens array and an image display apparatus using the same, according to another exemplary embodiment.

FIG. 13 is a diagram illustrating an image conversion lens array and an image display apparatus using the same, according to another exemplary embodiment. FIG.

<Description of Symbols for Main Parts of Drawings>

10, 70, 110: liquid crystal panel 20, 120: backlight unit

22: slit 30, 80, 280: observer

50 light source 60 lenticular lens

130 lenticular micro lens array 140 voltage source

150: lower substrate 155: liquid crystal

160: upper substrate 161: lower plate

162, 168: insulating film 164, 180: electrode

170: polar liquid 172: nonpolar liquid

The present invention relates to a lens array for image conversion, and an image display apparatus and method using the same. Particularly, an image conversion lens array for modulating a path of light using a polar liquid and a nonpolar liquid to display a planar image and a stereoscopic image, and It relates to an image display apparatus and method used.

A stereoscopic (ie, three-dimensional (hereinafter, referred to as "3D") image display apparatus using a conventional stereoscopic glasses allows a viewer to display a right eye image visible to the right eye and a left eye image visible to the left eye) on a stereoscopic screen. The viewer observes the right eye image and the left eye image displayed on the three-dimensional screen through the three-dimensional glasses, and then combines the right eye image and the left eye image in the head to feel the three-dimensional feeling to see the 3D image.

In other words, the 3D image uses a minute difference between the image of the observer's eyes, and as shown in FIG. This difference results in a 3D image.

In order to implement such a 3D image, it may be divided into anaglyph, shutter glasses, and DTI.

Stereograms are generally used to implement 3D images and are implemented using two different two colors. For example, when watching movies, red and blue glasses are used, which are called stereoscopic images.

Shutter glasses are a technology widely used in computers, and a display including a small liquid crystal panel provides a pair of three-dimensional images by providing each image to both eyes. First, one image is presented to the left eye using the left panel, and then another image is provided to the right eye using the right panel. At this time, the image of the left panel is removed. In this way it provides 60 frames of image per second to both eyes sequentially.

DTI is a method proposed by Dimension Technology Inc. of the United States to convert 3D image to a linear light source, which is commonly used in liquid crystal displays.

Referring to FIG. 2, a conventional 3D image display device includes a liquid crystal panel 10 and a linear backlight unit 20 for irradiating linear light onto the liquid crystal panel 10.

The liquid crystal panel 10 displays a desired image by adjusting a transmission amount of linear light emitted from the linear backlight unit 20 according to the data voltage applied to the liquid crystal injected between the upper and lower substrates (not shown).

The linear backlight unit 20 includes a light plate (not shown) surrounding a light source for generating light, and a plurality of slits 22 formed on the front surface of the light plate to emit light from the light source as linear light.

In the conventional 3D image display device, when the linear light from the linear backlight unit 20 passes through the liquid crystal panel 10 and reaches the two eyes of the observer 30 as shown in FIG. Are different positions of the liquid crystal panel 10, that is, different pixel areas. In other words, the eye of the observer 30 feels a 3D image due to the slight difference between the pixel region of the liquid crystal panel corresponding to the thick solid line and the pixel region of the liquid crystal panel corresponding to the dotted line.

Meanwhile, 'The 3D Display Using Field-Sequential LCD with Light Direction Controlling Back-light' disclosed in SID 01 Digest 13.2 pp. 174-177 and Korean Patent Publication No. 1997-0068686 (October 13, 1997) Another conventional 3D image display device proposed by the described image display device implements a 3D image using a lenticular lens.

Specifically, as shown in FIG. 4, the lenticular 3D image display device includes a liquid crystal panel 70, a light source 50 for irradiating light to the liquid crystal panel 70, a liquid crystal panel 70, and a light source 50. And a lenticular lens 60 disposed between the beams and modulating the path of the light irradiated from the light source 50 to the liquid crystal panel 70.

Such a conventional stereoscopic image display device uses a lenticular lens 60 to change the path of light reaching the eyes of the observer 80. Accordingly, the observer 80 's eye feels a 3D image due to the slight difference between the pixel region of the liquid crystal panel corresponding to the thick solid line and the pixel region of the liquid crystal panel corresponding to the dotted line.

Such a conventional stereoscopic image display device can only display 3D images at all times and has difficulty in displaying planar images 2D. For this reason, there is an urgent need for a multi-mode 3D image display device capable of selectively displaying planar images 2D and 3D images according to the intention of the user.

Accordingly, it is an object of the present invention to provide a lens array for image conversion and an image display apparatus and method using the same for displaying a planar image and a stereoscopic image by modulating a path of light using a polar liquid and a nonpolar liquid.

In order to achieve the above object, the lens array for image conversion according to the embodiment of the present invention is a plurality of cells containing a polar liquid and a non-polar liquid between the first and second substrate, and the first to correspond to each of the plurality of cells First electrodes formed on a first substrate, a first hydrophilic insulating film formed on the first substrate and covering the first electrodes to block contact between the first electrodes and the polar liquid and the nonpolar liquid; Second electrodes formed on the first hydrophilic insulating layer so as to contain the polar liquid and the non-polar liquid and separating the plurality of cells, and formed on a wall surface of the second electrodes, A second hydrophilic insulating film which blocks contact with the polar liquid and the nonpolar liquid, and an electrical signal supplied to the first and second electrodes to control the polar liquid; And a controller for converting a path of light and converting a 2D image represented by the light into either a 3D image or a 2D image, wherein the first and second electrodes supply the electrical signal to the polar liquid. The first and second hydrophilic insulating layers may insulate the polar liquid from the electrodes.

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The polar liquid in the image conversion lens array is characterized in that the water.

In the lens array for image conversion, the nonpolar liquid is an oil having a specific gravity different from that of the polar liquid.

The polar liquid in the image conversion lens array may be changed in a convex or concave shape in response to the electrical signal to convert a path of incident light.

An image display apparatus using an image conversion lens array according to an exemplary embodiment of the present invention includes a display apparatus for displaying a 2D image, a plurality of cells in which a polar liquid and a nonpolar liquid are contained between the first and second substrates, and the plurality of cells. First electrodes formed on the first substrate to correspond to each of the cells, and the first electrodes formed on the first substrate to block contact between the first electrodes and the polar liquid and the nonpolar liquid. A first hydrophilic insulating film covering, second electrodes formed on the first hydrophilic insulating film so as to contain the polar liquid and the nonpolar liquid, and separating the plurality of cells, and formed on the wall surface of the second electrodes A lens array including a second hydrophilic insulating film to block contact between the second electrodes and the polar liquid and the nonpolar liquid, and to the electrodes of the lens array. And a controller for controlling an urgent electrical signal, wherein the first and second electrodes supply the electrical signal to the polar liquid, and the first and second hydrophilic insulating films between the polar liquid and the electrodes. And the lens array converts the 2D image into either a 3D image or a 2D image according to the electrical signal.

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In the image display apparatus, the polar liquid is water.

In the image display apparatus, the nonpolar liquid is an oil having a specific gravity different from that of the polar liquid.

The polar liquid in the image display device is characterized in that the convex or concave change in response to the electrical signal to convert the path of the incident light.

In the image display device, the display device is a liquid crystal display panel.

The image display device may further include a backlight unit for irradiating light to the liquid crystal display panel.

In the image display apparatus, the lens array may be disposed between the liquid crystal display panel and the backlight unit.

In the image display apparatus, the lens array may be disposed in front of the liquid crystal display panel.

In the image display apparatus, the lens array may be disposed on the front surface of the liquid crystal display panel and integrated with the liquid crystal display panel.

In the image display device, the display device is a self-luminous display device.

In the image display apparatus, the lens array may be disposed in front of the self-luminous display apparatus.

An image display method using an image conversion lens array according to an exemplary embodiment of the present invention includes a plurality of cells in which a polar liquid and a nonpolar liquid are contained between a first substrate and a second substrate, and the first substrate to correspond to each of the plurality of cells. A first hydrophilic insulating film formed on the first substrate, the first hydrophilic insulating film formed on the first substrate and covering the first electrodes to block contact between the polar electrodes and the non-polar liquid; And second electrodes formed on the first hydrophilic insulating film so as to contain the non-polar liquid and separating the plurality of cells, and formed on a wall surface of the second electrodes to form the second electrodes and the polarity. Providing a lens array comprising a second hydrophilic insulating film for blocking contact with liquids and nonpolar liquids, displaying a 2D image on a display device; Controlling an electrical signal supplied to the first and second electrodes of a glass array to convert the 2D image into either a 3D image or a 2D image, the first and second electrodes being the polar liquid The electrical signal is supplied to the first and second hydrophilic insulating layers, wherein the polar liquid is insulated from the electrodes.

In the image display method, the polar liquid is water.

In the image display method, the nonpolar liquid is an oil having a specific gravity different from that of the polar liquid.

In the image display method, the polar liquid is changed in a convex or concave shape in response to the electrical signal, characterized in that for converting the path of incident light.

In the image display method, the polar liquid is concave in shape by the electrical signal supplied to the electrodes, and converts a path of light passing through itself to convert a 2D image into a 3D image.                     

In the image display method, the polar liquid is convexly changed in shape by the electrical signal supplied to the electrodes, thereby converting a path of light passing through it to convert a 3D image into a 2D image or to maintain a 2D image. It is characterized by.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 13.

5 and 6, the lens array for image conversion and the image display apparatus using the same according to the first embodiment of the present invention are liquid crystals that display a plane (that is, two-dimensional (hereinafter, referred to as "2D") image). A panel 110, a backlight unit 120 for irradiating light to the liquid crystal panel 110, and a polarity between the liquid crystal panel 110 and the backlight unit 120 and between the first and second substrates. A plurality of cells containing liquid and non-polar liquids 170 and 172 and electrodes 180 and 164 for supplying an electrical signal to the polar liquid 170 and stereoscopic (ie Lenticular Micro-Lens Array 130 for converting a 3D image into a 3D image or a 2D image, and electrodes 180 of the lenticular micro lens array 130. A switch element (SW) for controlling the electrical signal supplied to the 164 is provided.

The liquid crystal panel 110 is not shown to inject a liquid crystal 155 between the upper substrate 160 and the lower substrate 150 and to maintain a constant gap between the upper substrate 160 and the lower substrate 150. A spacer is provided. The upper substrate 160 of the liquid crystal panel 110 includes a color filter, a common electrode, a black matrix, and the like, which are not shown. In addition, the lower substrate 150 of the liquid crystal panel 110 includes thin film transistors TFT and liquid crystal cells Clc formed at respective regions defined by intersections of the gate lines GL and the data lines DL. The liquid crystal cell Clc realizes gray by adjusting light transmittance by changing an arrangement state of liquid crystals according to a pixel signal charged through the thin film transistor TFT.

The backlight unit 120 generates light using at least one lamp to irradiate the liquid crystal panel 110 with light generated through the lenticular micro lens array 130.

The lenticular micro lens array 130 modulates a path of light irradiated from the backlight unit 120 to the liquid crystal panel 110 using a micro lens using an electrowetting phenomenon. At this time, electrowetting is a phenomenon in which the liquid droplets move by electrically changing the surface tension of the liquid droplets.

To this end, each of the plurality of cells of the lenticular micro lens array 130 is formed on the lower plate 161 and the first electrodes 180 formed on the lower plate 161 as shown in FIG. 6. A first hydrophilic insulating layer 162 covering the electrodes 180, second electrodes 164 vertically formed on the first hydrophilic insulating layer 162 to correspond to each liquid crystal cell of the liquid crystal panel 110, and A second hydrophilic insulating film formed between the polar liquid 170 and the non-polar liquid 172 filled between the two electrodes 164, and the second electrodes 164 to insulate the second electrodes 164. 168 and a top plate 166 mounted on the second electrodes 164 to seal the polar liquid 170 and the nonpolar liquid 172 between the second electrodes 164.

The voltage from the voltage source 140 is applied to the first electrodes 180 and the second electrodes 164 according to the switching of the switch element SW.

The second electrodes 164 separate the polar liquid 170 and the non-polar liquid 172 filled on the first hydrophilic insulating layer 162 into predetermined regions and receive a voltage from the voltage source 140.

Water (H 2 O) is used as the polar liquid 170, and oil (Oil) having a low specific gravity is used as the non-polar liquid 172 so as not to be mixed with the polar liquid 170. The polar liquid 170 and the non-polar liquid 172 are filled and sealed between the second electrodes 164 by the upper plate 166. At this time, the non-polar liquid 172 serves to uniformly distribute the polar liquid 170 by the difference in specific gravity with the polar liquid 170.

The operation principle of the lenticular micro lens array 130 will be described with reference to FIG. 7. First, an insulating film 162 having hydrophilicity is formed on a substrate 181 made of an electrode material, and then a drop of the polar liquid 170 is dropped on the substrate 181. At this time, the polar liquid 170 on the substrate 181 has a convex shape (C) indicated by a dotted line because of its surface tension.

At this time, when a voltage is applied to both ends of the polar liquid 170 by applying a voltage to the electrode 188 inserted into the substrate 181 and the polar liquid 170, the convex shape is formed according to the voltage distribution applied to the hydrophilic insulating layer 162. The polar liquid 170 of C) is changed into a flat shape (D). Using the principle, the lenticular micro lens array 130 is irradiated to the liquid crystal panel 110 from the backlight unit 120 by changing the shape of the polar liquid 170 according to the voltage supplied from the voltage source 140. By modulating the path of the light 200, at least one of the planar image and the stereoscopic image is displayed. In other words, when the light 200 is incident, the lenticular micro lens array 130 operates as a lens having different focal lengths depending on whether or not a voltage is applied to the polar liquid 170. On the other hand, the operation principle of the lenticular micro lens array 130 has been proposed by the US Patent Registration No. 'US5,986,811', 'US5,717,453', 'US6,014,259'.

This will be described in detail as follows. In order to display a planar image, that is, a 2D image, an image conversion lens array and an image display apparatus and method using the same according to an exemplary embodiment of the present invention, the power source from the voltage source 140 is switched as shown in FIG. ) Is not applied to the first and second electrodes 180 and 164. Accordingly, the polar liquid 170 of the lenticular micro lens array 130 has a convex distribution by the surface tension. For this reason, the path of the light 200 irradiated from the backlight unit 120 proceeds according to the refractive index of the curvature radius of the polar liquid 170 of the lenticular micro lens array 130.

Accordingly, the left eye of the observer 280 observes the pixel region of the liquid crystal panel 110 corresponding to the thick solid line, and the right eye of the observer 280 corresponds to the pixel region of the liquid crystal panel 110 corresponding to the dotted line. Observed. Therefore, the left eye and the right eye of the observer 280 observe the same pixel area of the liquid crystal panel 110, so that the planar image is felt.

Meanwhile, in order to display a 3D image, the lens array for image conversion and the image display apparatus and method using the same according to an exemplary embodiment of the present invention are provided with a power supply from the voltage source 140 as shown in FIG. 10. Is applied to each of the first and second electrodes 180 and 164 via. Accordingly, the polar liquid 170 of the lenticular micro lens array 130 is changed in curvature by a change in electric field between the first and second electrodes 180 and 164 to form a concave distribution. In other words, when a voltage is applied between the two electrodes 180 and 164, the polar liquid 170 is redistributed along the hydrophilic treated first and second insulating layers 162 and 168 to form a concave shape. For this reason, the path of the light 200 irradiated from the backlight unit 120 is adjusted by the refraction of the lenticular micro lens array 130.

Accordingly, the left eye of the observer 280 observes the pixel region of the liquid crystal panel 110 corresponding to the thick solid line, and the right eye of the observer 280 corresponds to the pixel region of the liquid crystal panel 110 corresponding to the dotted line. Observed. Accordingly, since the left and right eyes of the observer 280 observe different pixel areas of the liquid crystal panel 110, the 3D image is felt by the minute observation difference (X, Y) between the left and right eyes.

As described above, an image conversion lens array and an image display apparatus and method using the same may adjust voltages applied to the first and second electrodes 180 and 164 of the lenticular micro lens array 130. As a result, the path of the light passing through the liquid crystal panel 110 and reaching the eyes of the observer is converted. Accordingly, the lens array for image conversion and the image display apparatus and method using the same according to an embodiment of the present invention use the minute difference (X, Y) of the light 200 that reaches the eyes of the observer 280. Dimensional or three-dimensional stereoscopic images can be implemented. Accordingly, the lens array for image conversion and the image display apparatus and method using the same according to an exemplary embodiment of the present invention display a 2D image when no voltage is applied to the lenticular micro lens array 130, whereas the lenticular microlens is displayed. When a voltage is applied to the lens array 130, a 3D image is displayed.

Meanwhile, in the image conversion lens array and the image display apparatus and method using the same, the lenticular micro lens array 130 may be disposed on the liquid crystal panel 110 as illustrated in FIG. 12. . Accordingly, the lenticular micro lens array 130 may convert the path of the light emitted from the liquid crystal panel 110 according to the presence or absence of the applied voltage to implement the 2D image or the 3D image.

On the other hand, in the lens array for image conversion and the image display apparatus and method using the same according to an embodiment of the present invention, as shown in FIG. 160 is formed integrally on. That is, the first electrode 180 of the lenticular micro lens array 130 is formed on the upper substrate 160 of the liquid crystal panel 110 and covers the first electrodes 180 thereon. 162, the aforementioned second electrodes 164, the polar liquid 170 and the nonpolar liquid 172, the second hydrophilic insulating layer 168, and the upper plate 166 are formed.

Further, in the image conversion lens array and the image display apparatus and method using the same, the lenticular micro lens array 130 may include a field emission display in addition to the liquid crystal panel 110 described above. It is disposed on various self-luminous and non-luminous flat panel displays, including a plasma display panel and an electro-luminescence display device, and the flat panel according to the presence or absence of voltage The path of the light emitted from the display device may be converted to implement a 2D or 3D image.

As described above, the multi-mode stereoscopic image display device according to an embodiment of the present invention includes a lenticular micro lens array that converts a path of light by changing the surface tension of the polar liquid using an electrowetting phenomenon. Accordingly, the present invention is to convert the path of the light in accordance with the presence or absence of the voltage supplied to the polar liquid. Therefore, the observer observes the path of the light converted by the lenticular micro lens array to observe the image displayed on the display device in two or three dimensions.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (27)

A plurality of cells containing a polar liquid and a nonpolar liquid between the first and second substrates, First electrodes formed on the first substrate so as to correspond to each of the plurality of cells; A first hydrophilic insulating film formed on the first substrate and covering the first electrodes to block contact between the first electrodes and the polar liquid and the nonpolar liquid; Second electrodes containing a polar liquid and a non-polar liquid and vertically formed on the first hydrophilic insulating film to separate the plurality of cells; A second hydrophilic insulating film formed on a wall of the second electrodes to block contact between the second electrodes and the polar liquid and the nonpolar liquid; A controller for controlling an electrical signal supplied to the first and second electrodes to convert a path of light passing through the polar liquid and converting a 2D image represented by the light into either a 3D image or a 2D image , And the first and second electrodes supply the electrical signal to the polar liquid, and the first and second hydrophilic insulating layers insulate the polar liquid from the electrodes. delete delete delete Claim 5 was abandoned upon payment of a set-up fee. The method of claim 1, And the polar liquid is water. Claim 6 was abandoned when the registration fee was paid. The method of claim 1, And the nonpolar liquid is an oil having a specific gravity different from that of the polar liquid. The method of claim 1, And the polar liquid changes convex or concave in response to the electrical signal to change a path of incident light. A display device for displaying a 2D image, A plurality of cells containing a polar liquid and a non-polar liquid between the first and second substrates, first electrodes formed on the first substrate so as to correspond to each of the plurality of cells, and formed on the first substrate A first hydrophilic insulating film covering the first electrodes to block the contact between the first electrodes and the polar liquid and the nonpolar liquid, a polar liquid and a nonpolar liquid, and the plurality of cells to separate the plurality of cells. 1. A lens including second electrodes vertically formed on a hydrophilic insulating film and a second hydrophilic insulating film formed on a wall surface of the second electrodes to block contact between the second electrodes and the polar liquid and the nonpolar liquid. Arrays, A controller for controlling an electrical signal supplied to the electrodes of the lens array, The first and second electrodes supply the electrical signal to the polar liquid, the first and second hydrophilic insulating layers insulate the polar liquid from the electrodes, and the lens array is adapted to the electrical signal. And converting the 2D image into any one of a 3D image and a 2D image. delete delete delete Claim 12 was abandoned upon payment of a registration fee. The method of claim 8, And the polar liquid is water. Claim 13 was abandoned upon payment of a registration fee. The method of claim 8, And the nonpolar liquid is an oil having a specific gravity different from that of the polar liquid. The method of claim 8, And the polar liquid converts a path of light incident upon being changed convexly or concavely in response to the electrical signal. The method of claim 8, And said display device is a liquid crystal display panel. The method of claim 15, And a backlight unit for irradiating light to the liquid crystal display panel. The method of claim 16, And the lens array is disposed between the liquid crystal display panel and the backlight unit. The method of claim 16, And the lens array is disposed in front of the liquid crystal display panel. The method of claim 16, And the lens array is disposed in front of the liquid crystal display panel and integrated with the liquid crystal display panel. The method of claim 8, And the display device is a self-luminous display device. The method of claim 20, And the lens array is disposed in front of the self-luminous display device. A plurality of cells containing a polar liquid and a non-polar liquid between the first and second substrates, first electrodes formed on the first substrate so as to correspond to each of the plurality of cells, and formed on the first substrate A first hydrophilic insulating film covering the first electrodes to block the contact between the first electrodes and the polar liquid and the nonpolar liquid, a polar liquid and a nonpolar liquid, and the plurality of cells to separate the plurality of cells. 1. A lens including second electrodes vertically formed on a hydrophilic insulating film and a second hydrophilic insulating film formed on a wall surface of the second electrodes to block contact between the second electrodes and the polar liquid and the nonpolar liquid. Providing an array, Displaying a 2D image on a display device; Controlling the electrical signals supplied to the first and second electrodes of the lens array to convert the 2D image into either a 3D image or a 2D image, And the first and second electrodes supply the electrical signal to the polar liquid, and the first and second hydrophilic insulating layers insulate the polar liquid from the electrodes. Image display method using. Claim 23 was abandoned upon payment of a set-up fee. The method of claim 22, And the polar liquid is water. Claim 24 is abandoned in setting registration fee. The method of claim 22, And the nonpolar liquid is an oil having a specific gravity different from that of the polar liquid. The method of claim 22, And the polar liquid converts a path of light incident upon being changed convexly or concavely in response to the electrical signal. The method of claim 25, The polar liquid is concave in shape by the electrical signal supplied to the electrodes to convert the path of the light passing through it to convert a 2D image to a 3D image using the lens array for image conversion Image display method. The method of claim 25, The polar liquid is convexly changed in shape by the electrical signal supplied to the electrodes to convert a path of light passing through the polar liquid to convert a 3D image into a 2D image or maintain the 2D image as it is. Image display method using lens array for image conversion.

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