KR102051043B1 - Display including electro-wetting prism array - Google Patents

Abstract

Disclosed is a display comprising an electro-wetting prism array. A display according to an embodiment of the present invention includes a 2D display for providing an image using the light of the light source, a prism array, and an optical element for enhancing the refractive power of the light transmitted through the display, and at least one of the at least one prism array. The refractive power of the prism is controlled in real time. In such a display, the optical element may be provided before or after the prism array. The optical element may be any one of a convex lens, a Fresnel lens, a holographic optical element (HOE), a diffractive optical element (DOE), a second electro-wetting prism array, a liquid crystal lens, and a crowd consisting of optical elements acting as a lens. Can be. The convex lens may be a focal variable lens.

Description

Display including electro-wetting prism array

One embodiment of the present invention relates to a display, and more particularly, to a display capable of 2D / 3D conversion, including an electro-wetting prism array.

The technique of using binocular disparity among 3D image display technology is to provide two 2D images with binocular disparity separately from the observer's left eye and right eye. Two 2D images obtained using a stereo camera are the same as those obtained from the left and right eyes.

There are two methods of observing 3D images from two 2D images, one using glasses and one without glasses.

Examples of using glasses include anaglyph method, concentration difference method, polarization filter method, and LCD shutter method.

There are two methods of observing 3D images without glasses: a parallax barrier method and a lenticular method.

On the other hand, electro-wetting prism arrays have recently been used for 3D display, and the contact angle of the prisms constituting the electro-wetting prism array is limited to a predetermined range. The limited contact angle of the prisms constituting the electro-wet prism array means that the steering of the electro-wet prism array is limited. If the steering of the electro-wetting prism array is limited, eventually the refractive ability (or refractive power) of the electro-wetting prism array is limited, thus limiting (narrowing) the viewing angle and viewing range, and the viewing distance (minimum distance to view 3D). There may also be limits to the reduction.

It provides a display that can observe 2D / 3D images in a wider area and lower the driving voltage.

According to an embodiment of the present invention, a display includes a light source, a 2D display that provides an image using light from the light source, a prism array, and an optical element that increases refractive power or refractive power of light transmitted through the light source. Wherein the refractive power of the one or more prisms in the prism array is controlled in real time.

In such a display, the optical element may be provided to receive light transmitted from the prism.

The optical element may be arranged such that light emitted from the optical element is incident on the prism array.

The optical element includes a convex lens, a fresnel lens, a holographic optical element (HOE), a diffraction optical element (DOE), a liquid crystal lens, and a crowd consisting of optical elements acting as a lens. It can be either. In addition, the prism array may be a first electro-wet prism array. The optical element may be a film acting as a lens or an array of second electro-wetting prisms. In this case, the convex lens may be a focus variable lens.

The prism array may include prisms disposed such that the prism array serves as a convex lens.

The prism array may include prisms disposed such that the prism array serves as a concave lens.

The plurality of prisms constituting the prism array may all have the same refractive characteristics.

The 2D display may have a small collimation angel.

The 2D display may be a 2D display providing directional light.

The optical element may include an optical element for converting light emitted from the prism array into parallel light.

The prism array may be an unvariable prism array that controls the advancing direction of the image in a fixed constant direction.

A display according to another embodiment of the present invention includes a light source, a display for providing an image using the light of the light source, an array of electro-wetting prisms, and an optical element for enhancing the refractive power of light transmitted through the display.

The 2D / 3D switchable display according to an embodiment of the present invention includes a lens for increasing refractive power or refractive power in front of or behind the electro-wetting prism array. Accordingly, since the refractive power of the light refracted in the electro-wetting array is increased, the minimum viewing distance can be shorter and the viewing angle and viewing range can be increased than without the lens.

Also, by driving the electro-wetting prism array to act as a concave lens, the depth of field of view can be deeper (the viewing distance can be increased) and the refraction angle control margin of the prism than when the electro-wetting prism array acts as a convex lens. This may be increased to facilitate providing 3D images at a distance. In addition, when the electro-wetting prism array is driven to act as a concave lens, switching between 2D and 3D is possible.

In addition, as described above, by providing a lens having a high refractive power, the refractive power of the prism array can be lowered by the refractive power increased by the lens, which means that the driving voltage of the prism array can be lowered. It can be helpful.

1 is a cross-sectional view of a display including an electro-wetting prism array in accordance with one embodiment of the present invention.
2 is a cross-sectional view of a display including an electro-wetting prism array according to another embodiment of the present invention.
3 is a cross-sectional view illustrating an example of the prism array 24 of FIG. 1.
4 is a cross-sectional view showing the change of the interface of the electro-wetting prisms according to the position to observe the 3D image.
FIG. 5 is a cross-sectional view of an observer positioned on the axis of refraction and center light and near the focal length when the contact angles of the plurality of prisms constituting the electro-wetting prism array are all 90 degrees.
FIG. 6 is a cross-sectional view illustrating an image of a 3D image when the contact angles of a plurality of prisms included in the prism array are all greater than 90 degrees and the same.
7 is a cross-sectional view illustrating an image of a 3D image when the contact angles of a plurality of prisms included in the prism array are all smaller than and equal to 90 degrees.
8 is a cross-sectional view illustrating a case where the lens of FIG. 7 is replaced with a variable focus lens.
FIG. 9 is a cross-sectional view illustrating an imaging position of a 3D image when the prism array of FIG. 1 serves as a concave lens.
FIG. 10 is a cross-sectional view illustrating a case in which the lens is an electro-wetting prism array in FIG. 1.
FIG. 11 is a cross-sectional view illustrating a case in which a first electro-wetting prism serves as a concave lens and a second electro-wetting prism serves as a convex lens in FIG. 10.
12 is a cross-sectional view of an electro-wetting prism forming an array of electro-wetting prisms included in a display according to embodiments of the present invention.

Hereinafter, a display including an electro-wetting prism array according to an embodiment of the present invention and capable of 2D / 3D conversion will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of layers or regions illustrated in the drawings are exaggerated for clarity.

1 is a cross-sectional view showing an example of the configuration of a display (hereinafter referred to as a first display) including an electro-wetting prism array according to an embodiment of the present invention.

Referring to FIG. 1, the first display may include a light source 20, a liquid crystal panel 22 in which an image is generated, and an electro-wetting prism array (hereinafter, referred to as a prism array) that controls a moving direction of an image coming from the liquid crystal panel 22. 24, the lens 26 is included. Lens 26 collects light coming from prism array 24. Lens 26 may be one of the optical elements that increases the refractive power of light passing through it. The lens 26 serves as a convex lens, a fresnel lens, a holographic optical element (HOE), a diffraction optical element (DOE), a liquid crystal lens, and a lens. It may be any one of a crowd consisting of optical elements. In addition, the lens 26 may be a film that acts as a lens. The refractive power or refractive power of the lens 26 may be greater than the refractive power of the prism array 24. The light source 20 may be a back light unit used as a light source in a conventional liquid crystal display. The light source 20 may be a light source including a plurality of light emitting diodes. The liquid crystal panel 22 may be a liquid crystal and a conventional liquid crystal panel having electrodes at the front and the rear thereof, respectively. The liquid crystal panel 22 may be a 2D display having a small collimation angel. The liquid crystal panel 22 may also be a 2D display that provides directional light. The liquid crystal panel 22 may be a transmissive type or a light emitting type. Instead of the liquid crystal panel 22, various 2D displays may be used. For example, an organic light emitting diode (OLED) or a plasma display panel (PDP) may be used. A light sheet or separate optics may be required for light collimation in which OLEDs or PDPs are used.

Lens 26 may be provided at a location (to receive) light that is transmitted from prism array 24. For example, there may be a lens 26 in front of the prism array 24, which has a positive power between the prism array 24 and the observer. By doing so, the light refracted in the prism array 24 can be refracted by the lens 26 again. Accordingly, the angle of refraction of the light passing through the lens 26 is greater than the angle of refraction of the light passing through the prism array 24. Therefore, the position where the light (solid line) converges after passing through the lens 26 and the first distance D1 between the lens 26 is the position where the lens 26 is to be disposed and the light (dashed line) is the prism array 24. Shorter than the second distance D2 between the converged positions after passing. When the angle of refraction of the light by the prism array 24 is maximum, the first distance D1 and the second distance D2 are the minimum observation distances when the lens 26 is present and when the lens 26 is not present, respectively. Comparing the first and second distances D1 and D2, it can be seen that when the lens 26 is present, the minimum viewing distance is shortened. In other words, when the lens 26 is present than when the lens 26 is not present, the minimum distance to view the 3D image is shortened. In other words, the presence of the lens 26 allows the viewer to view the 3D image at a closer location.

Also, because of the presence of the lens 26, the angle of refraction becomes larger than without the lens 26, so that the viewing angle Ω1 when the lens 26 is present is the viewing angle Ω2 when the lens 26 is not present. Greater than). Since the viewing angle becomes large in this manner, the viewing range when the lens 26 is present becomes much wider than when the lens 26 is not present.

2 is a cross-sectional view illustrating an example of a configuration of a display (hereinafter referred to as a second display) including an electro-wetting prism array according to another embodiment of the present invention.

Referring to FIG. 2, in the second display, the lens 26 is positioned between the liquid crystal panel 22 and the prism array 24. In other words, lens 26 may be arranged such that light emitted from itself is incident on prism array 24. The remaining configuration may be the same as the first display.

3 shows an example of the prism array 24 of FIG. 1.

Referring to FIG. 3, the prism array 24 includes a plurality of electro-wetting prisms 24a. In FIG. 3, the plurality of electro-wetting prisms 24a is shown simply for convenience. More detailed configuration of the electro-wetting prism 24a is described below. The interface S1 of the plurality of electro-wetting prisms 24a represents the interface of the liquid having different refractive indices filled in the electro-wetting prism 24a. The inclination angle or contact angle of this interface S1 can be adjusted by the voltage applied to the electro-wetting prism 24a, so that the propagation direction of the light transmitted through the electro-wetting prism 24a is applied. Can be controlled by voltage. In other words, the angle of refraction of the light incident on the prism 24a can be adjusted to the voltage applied to the prism 24a, and thus the driving voltage applied to the prism 24a is adjusted to any position within the viewing zone. A binocular 3D image can be provided to a located observer. Since the refractive characteristic of the prism 24a depends on the driving voltage applied to the prism 24a, the inclination of the interface S1 of the prism 24a may also vary depending on the position on the prism 24a. The prism array 24 of FIG. 3 may serve as a convex lens. The prism array 24 may serve as the convex lens because of the prisms 24a arranged so that the prism array 24 serves as the convex lens. 3, the interface S2 of the electro-wetting prism 24b at a position corresponding to the top edge of the lens 26 may have a contact angle causing maximum refraction. Similarly, the interface S3 of the electro-wetting prism 24c at a position corresponding to the bottom edge of the lens 26 may also have a contact angle causing maximum refraction. And the interface S4 of the electro-wetting prism 24d at the position corresponding to the center of the lens 26 is perpendicular to the incident light. For prisms provided between the prisms 24b at the center and the prisms 24d at the upper edge, the contact angles may be controlled such that the angle of refraction decreases toward the center of the prism array 24. Prisms distributed between the prism 24c at the lower edge and the center prism 24d may also control the contact angle such that the angle of refraction decreases toward the center of the prism array 24. An interface between the prisms disposed above the prism 24d positioned at the center of the prism array 24 and an interface of the prism positioned below the symmetry may be symmetric about the prism 24d. In such a case, the 3D image may be viewed at a position separated by the first distance D1 from the lens 26 on the optical axis passing through the center of the lens 26. When the prisms 24b and 24c of the edge have the maximum refraction angle, the first distance D1 is the minimum viewing distance for viewing the 3D image. If the prisms 24b and 24c of the edge are controlled to have a smaller angle of refraction than the maximum angle of refraction and the inner prisms are also controlled to have a smaller angle of refraction than the case of FIG. Can be observed. The 3D image can be viewed within the field of view defined by the field of view (Ω1). The 3D image may be provided to the observer in an eye-tracking manner that tracks the position of both eyes of the observer within the viewing range. In this eye-tracking method, the final position at which the 3D image is formed may be determined by reflecting the focal length of the lens 26 in the result of the prism array 24. By dividing the image in a time-divisional or spatial-divisional manner in the eye-tracking method to provide different images to the observer's eyes, the viewer sees a parallax image, that is, a 3D image. An image divided by a time division or space division scheme may be provided by adjusting a driving voltage applied to the prism array 24.

4 shows the change of the interface of the electro-wetting prisms according to the position of viewing the 3D image.

Referring to FIG. 4, when the observer's position P1 observing the 3D image is to the right of the observer of FIG. 3, the plurality of electricity forming the prism array 24 so that the 3D image can be brought into this position P1. The contact angle of the wet prism 24a is adjusted. The observer's position P1 is off the optical axis passing through the center of the lens 26 and at this position P1 a 3D image should be visible. Therefore, in the case of FIG. 4, the distribution of the interface of the plurality of prisms 24a is different from that of FIG. 3. In other words, the interface S4 of the prism 24d corresponds to the case where the contact angle is 90 degrees in FIG. 3, but the contact angle is larger than 90 degrees in FIG. 4. And the refractive power or refractive power of the prism 24b at the upper edge in FIG. 4 is smaller than the case shown in FIG. Therefore, the angle of refraction of the light passing through the prism 24b in FIG. 4 is smaller than that shown in FIG. 3. Refracted lights L1 and L2 indicated by dotted lines in FIG. 4 represent the refracted light in FIG. 3. Comparing the refracted light L1 and L2 indicated by the dotted line in FIG. 4 and the refracted light L11 and L22 of the solid line, the refraction of the prism array 24 having the interface distribution of the prism 24a as shown in FIG. It can be seen that the twill or refractive power is weaker than when the interface distribution of the prism 24a is as shown in FIG.

FIG. 5 shows that the contact angles of the plurality of prisms 24a constituting the prism array 24 are all 90 degrees, and when the interface of each prism 24a is flat, it is located on the axis of refraction and center light and near the focal length. Show the observer located.

When the contact angles of the plurality of prisms 24a are all 90 degrees, the prism array 24 is like a prism with a uniform overall thickness, so that no refraction appears in the prism array 24. Therefore, parallel light incident on the prism array 24 is imaged at the focal point of the lens 26. The focal length f of the lens 26 may be greater than the minimum viewing distance D1.

6 and 7 illustrate a case in which the contact angles of the interfaces of the plurality of prisms 24a of the prism array 24 of FIG. .

FIG. 6 shows an image of a 3D image when the contact angles of the plurality of prisms 24a are all greater than 90 degrees and the same. In FIG. 6, light incident on the prism array 24 is refracted to the left in the advancing direction and incident on the lens 26. In the case of FIG. 6, the refractive indices of the plurality of prisms 24a are all the same, and the light transmitted through the plurality of prisms 24a all have the same refractive angle. Thus, the light refracted by the plurality of prisms 24a is still parallel light. But the direction of light changes. Accordingly, the light incident on the lens 26 after passing through the prism array 24 is parallel light incident to the left of the traveling direction of the light incident on the prism array 24. Parallel light incident on the lens 26 is formed on the focal plane of the lens 26. At this time, the imaging position is shifted to the left in the advancing direction of the light incident on the prism array 24 as compared with the case of FIG. 5. The focal plane is a plane passing through the focal point of the lens 26 and positioned at the focal length f, and may be a plane perpendicular to the center of the lens 26 and the virtual optical axis passing through the focal point. 5 and 6, the light incident through the prism array 24 and incident on the lens 26 is parallel light and is imaged on the focal plane of the lens 26. Therefore, an observer located at the focal plane of the lens 26 may view a 3D image. However, since the focal point of the lens 26 is located on the focal plane, an area where a 3D image can be viewed may be limited to the focal plane.

FIG. 7 is the reverse of FIG. 6. That is, FIG. 7 shows the imaging of the 3D image when the contact angles of the plurality of prisms 24a are all smaller than and equal to 90 degrees.

Referring to FIG. 7, the light incident on the prism array 24 is refracted to the right of the traveling direction and is incident in parallel to the lens 26. Since the parallel light incident on the lens 26 is incident to the right of the traveling direction of the light incident on the prism array 24, the position where the 3D image is formed in the focal plane is compared to the prism array 24 in comparison with the case of FIG. 5. It is moved to the right in the advancing direction of the incident light. Also in FIG. 7, an area where a 3D image can be viewed may be limited to the focal plane.

5, 6, or 7, the plurality of prisms 24a constituting the prism array 24 all have the same contact angle. By applying driving voltages having the same conditions to each of the plurality of prisms 24a, the plurality of prisms 24a can all have the same contact angle. Accordingly, in the case of FIGS. 5 to 7, the driving of the prism array 24 may be easy and simple. However, as described above, the imaging area of the 3D image may be limited to the focal plane of the lens 26.

FIG. 8 shows a case where the lens 26 of FIG. 7 is replaced with the focus variable lens 36. 5 and 6, the lens 26 may be replaced with the focal variable lens 36.

Referring to FIG. 8, when the variable focus lens 36 is drawn in a solid line, the variable focus lens 36 may be the same as the lens 26 of FIGS. 5 to 7. Therefore, the first focal length f1 of the variable focus lens 36 may be the same as the focal length f of the lens 26 of FIGS. 5 to 7.

On the other hand, when the focus variable lens 36 is drawn in a dotted line, when the thickness of the focus variable lens 36 is thinner than the thickness of the lens 26 of FIGS. 5 to 7, the refraction of the focus variable lens 36 is reduced. The twill or refractive power may be lower than the lens 26 of FIGS. 5-7. Therefore, the second focal length f2 of the focus variable lens 36 at this time is longer than the first focal length f1. In this way, by changing the focal length of the variable-focal lens 36, the position where the 3D image is formed is not limited to one particular focal plane, but can be formed on a plurality of focal planes having different focal lengths. Therefore, in the case of FIG. 8, the viewing area may be much wider than in the case of FIGS. 5 to 7.

FIG. 9 shows an image of a 3D image when the prism array 24 of FIG. 1 serves as a concave lens.

Referring to FIG. 9, among the plurality of prisms 24a constituting the prism array 24, the interface S4 is flat with a contact angle of 90 ° at the center of the prism array 24. The interface of the prisms above the prism 24d is in a state where the contact angle is larger than 90 °. The upper prisms have a larger contact angle toward the edge of the prism array 24. The interface of the prisms below the prism 24d is in a state where the contact angle is smaller than 90 °. The lower prisms have a smaller contact angle toward the edge of the prism array 24. The interface distribution of the prisms constituting the prism array 24 is thus made, so that light incident on the prism array 24 passes through the prism array 24 and then diverges. From these results, it can be seen that the prism array 24 of FIG. 9 functions as a concave lens that emits incident light. The prism array 24 may serve as a concave lens because the prisms 24a are arranged so that the prism array 24 serves as a concave lens. Accordingly, since the light incident on the lens 26 becomes divergent light instead of parallel light, after passing through the lens 26, the position D22 where the light is imaged is parallel light (dotted line) to the lens 26. When incident, it is farther than the image forming position D11. When the prism array 24 is driven to act as a concave lens in this manner, when the prism array 24 is driven to act as a convex lens, even when the prism array 24 is driven farther than the position where the 3D image can be viewed (D1 in FIG. 3). You can watch the video. In other words, when the prism array 24 serves as a concave lens, the position where the 3D image can be viewed may be further from the lens 26 than when the prism array 24 serves as a convex lens. Therefore, when the prism array 24 is driven to act as a concave lens, the depth of view for viewing the 3D image may be deeper than when the prism array 24 is driven to act as a convex lens.

When the prism array 24 is driven to act as a concave lens, driving control of the prism array 24 according to the change in the observation position may be easier than when the prism array 24 is used as a convex lens. In other words, the control margin of the contact angle of each prism can be larger than when the prism array 24 is used as a convex lens.

On the other hand, 2D can be observed when the light incident on the prism array 24 and emitted and becomes the parallel light (a dashed line) while passing through the lens 26 in FIG. 9. Thus, by replacing the lens 26 in FIG. 9, for example with the variable focus lens 36 in FIG. 8, switching between 3D and 2D may be possible.

In addition, the prism array 24 is a flat plate as indicated by the dotted line, that is, the prism array 24 serves as a transparent flat plate, the lens 26 is replaced by the focal variable lens 36, and the focus is infinite. When adjusted so that the 3D image may be converted into a 2D image.

In addition, even when the prism array 24 serves as a concave lens, and the lens 26 serves as a convex lens, the 3D image may be converted into 2D. Conversely, the prism array 24 may be adjusted to serve as a convex lens, and the lens 26 may convert a 3D image to 2D even when it is adjusted to serve as a concave lens.

FIG. 10 shows the case where the lens 26 in FIG. 1 is an electro-wetting prism array 44. The 3D display thus includes two arrays of electro-wetting prisms 24, 44.

Referring to FIG. 10, the interface distribution of the prisms 24a and 44a constituting the two electro-wetting prism arrays 24 and 44 shows that each of the two electro-wetting prism arrays 24 and 44 functions as a convex lens. I can see that. The interface distribution of the prism 24a of the first prism array 24 may have various distributions according to the position where the 3D image is formed. The interface distribution of the prism 24a of the first prism array 24 may have a distribution as shown in FIGS. 5 to 7. In addition, the first prism array 24 may be driven to act as a concave lens as shown in FIG. 11. Therefore, the case of FIG. 11 may have the same result as that of FIG. 9.

In FIG. 10, the second electro-wetting prism array 44 may be driven to serve as a variable focus lens, in which case the same result as in FIG. 8 may be obtained.

12 shows a cross-sectional view of the electro-wetting prism 24a constituting the prism array described above. Since the construction of the electro-wetting prism is well known, it is simply shown in FIG.

Referring to FIG. 12, electro-wetting prism 24a includes first and second electrodes 50, 52 and a liquid 54 filled therebetween. Liquid 54 may be oil or water, for example. An upper region of the liquid 54 between the first and second electrodes 50 and 52 may have a material having a refractive index smaller than that of the liquid 54. When the inclination of the interface S1 of the liquid 54 is as shown in FIG. 12, when the contact angle of the liquid 54 with respect to the first electrode 50 is smaller than 90 degrees, the light incident on the prism 24a is incident light. Is refracted to the right in the advancing direction. When the contact angle is larger than 90 degrees, the incident light is refracted to the left of the advancing direction of the incident light. When the contact angle of the liquid 54 to the first electrode 50 is 90 degrees, the interface S1 of the liquid 54 becomes flat, and the incident light passes through the prism 24a without refraction.

The prism 24a configuration of FIG. 12 may also be applied to the prism 44a of the second prism array 44 of FIG. 10.

In the above-described embodiments of the present invention, since the lenses 26 and 36 are means for increasing the refractive power, the refractive power of the prism array 24 may be reduced even if the refractive power of the prism array 24 is slightly lower than that of the conventional case. Can be compensated for). Lowering the refractive power of the prism array 24 means lowering the driving voltage of the prism array 24. Accordingly, by including the lenses 26 and 36 in front of or behind the prism array 24 as in the embodiments of the present invention, the driving voltage of the prism array 24 may be lowered.

While many details are set forth in the foregoing description, they should be construed as illustrative of preferred embodiments, rather than to limit the scope of the invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the technical spirit described in the claims.

20: light source 22: LCD panel
24: electro-wetting prism array
24a: multiple prisms forming an array of prisms
24b: prism at top edge of prism array
24c: prism at bottom edge of prism array
24d: prism located in the center of the prism array
26: lens 36: focus variable lens
44: second prism array 44a: prism forming a second prism array
50, 52: first and second electrodes 54: liquid
D1, D2: first and second distances D11, D22: positions where refractive light is imaged
f1, f2: first and second focal lengths f: focal length
L1, L2, L11, L22: Refractive light P1: Position of observer
S1-S4: Interface of Prisms in Prism Array
Ω1, Ω2: First and second viewing angles

Claims (14)

Light source;
2D display for providing an image using the light of the light source;
A prism array including a plurality of prisms; And
It includes; optical element for increasing the refractive power of the light transmitted through the
The optical element is fixed at a position where light transmitted through each of the plurality of prisms is transmitted through the optical element,
The optical element includes an optical element for converting light emitted from the prism array into parallel light,
The refractive power of one or more prisms in the prism array is controlled in real time.
Display. delete delete The method of claim 1,
Wherein the optical element is any one of a convex lens, a Fresnel lens, a holographic optical element (HOE), a diffractive optical element (DOE), a liquid crystal lens and a crowd consisting of optical elements acting on the lens. The method of claim 1,
And the prism array is a first electro-wet prism array and the optical element is a second electro-wet prism array. The method of claim 4, wherein
And the convex lens is a focal variable lens. The method according to claim 1 or 5,
And the prism array comprises prisms arranged such that the prism array acts as a convex lens. The method according to claim 1 or 5,
And the prism array comprises prisms arranged such that the prism array acts as a concave lens. The display of claim 1, wherein the optical element is a film that acts as a lens. The method according to claim 1 or 6,
And a plurality of prisms constituting the prism array all have the same refractive characteristics. The method of claim 1,
And the 2D display is a 2D display providing directional light. delete The method of claim 1,
The prism array is a non-deformable prism array for controlling the advancing direction of the image in a fixed direction. Light source;
A display providing an image using light from the light source;
Electro-wet prism arrays; And
It includes; optical element for increasing the refractive power of the light transmitted through the
The optical element is fixed at a position where all light transmitted through the electro-wetting prism array is transmitted through the optical element,
And the optical element includes an optical element for converting light emitted from the electro-wetting prism array into parallel light.

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