Light field display device

Abstract

A light field display device disclosed herein comprises: a display panel that emits light for forming an image; a first lens array in which a plurality of first lenses are arranged; a second lens array in which a plurality of second lenses are arranged; and a barrier having an aperture through which light passes. The barrier is configured so that the aperture ratio can be electrically adjusted. Also, the distance between the display panel and the second lens array is configured to be equal to the combined focal length of the first lens array and the second lens array.

Description

Light field display device

[0001] An exemplary embodiment relates to a light field display device having high brightness and a wide viewing angle.

[0002] Generally, 3D images are created based on the principle of stereoscopic vision through the two human eyes. Since the two eyes are approximately 65mm apart, binocular parallax is the most important factor in creating a sense of three-dimensionality. 3D image display devices can be divided into displays that use glasses and displays without glasses. Glasses-free displays separate the left and right images to obtain a 3D image without using glasses. Glasses-free methods include barrier-based and lens-based methods.

[0003] Barrier-based methods alternately print or photograph images for each eye in a vertical pattern, then use a barrier to view them. This distributes the vertically patterned images for the left and right eyes, allowing each eye to see images from different viewpoints, creating a stereoscopic image.

[0004] Lens-based methods place corresponding images for the left and right eyes on the focal plane of the lens. When observed through the lens, the images for the left and right eyes are separated according to the directional characteristics of the lens, forming a three-dimensional shape. Compared to barrier-based methods, lens-based methods have higher luminance but a narrower field of view, while barrier-based methods have a wider field of view but lower luminance.

[0005] A light field display device according to an exemplary embodiment includes a display panel that emits light to form an image. A first lens array is provided on the display panel and has a structure in which a plurality of first lenses are arranged. A second lens array is arranged spaced apart from the first lens array and has a structure in which a plurality of second lenses are arranged. A barrier is arranged at any one of the following locations: between the display panel and the first lens array, between the first lens array and the second lens array, and in front of the second lens array. The barrier may have an aperture through which the light is transmitted.

[0006] A light field display device according to an exemplary embodiment may include a display panel that emits light to form an image. A first lens array may be provided on the display panel, and may have a structure in which a plurality of first lenses are arranged. A second lens array may be arranged adjacent to the first lens array, and may have a structure in which a plurality of second lenses are arranged. A third lens array may be arranged adjacent to the second lens array, and may have a structure in which a plurality of third lenses are arranged.

[0007] FIG. 1 schematically illustrates a light field display device according to an exemplary embodiment.

[0008] FIG. 2 is an enlarged view of one lens area of ​​the light field display device illustrated in FIG. 1.

[0009] FIG. 3 illustrates an example in which the arrangement direction of the first lens and the second lens is changed in the light field display device illustrated in FIG. 1.

[0010] Figure 4 shows images from various viewing angles of a light field display device of a comparative example.

[0011] FIG. 5 shows images from various viewing angles of a light field display device according to an exemplary embodiment.

[0012] FIG. 6 shows an example in which the barrier of a light field display device according to an exemplary embodiment is configured to be variable.

[0013] Fig. 7 shows an example in which the aperture ratio of the barrier of a light field display device according to an exemplary embodiment is relatively greatly adjusted.

[0014] FIG. 8 shows an example in which the aperture ratio of the barrier of a light field display device according to an exemplary embodiment is adjusted to be relatively small.

[0015] FIGS. 9 and 10 are drawings for explaining a method of adjusting a barrier aperture ratio in a light field display device according to an exemplary embodiment.

[0016] FIG. 11 schematically illustrates a light field display device according to an exemplary embodiment.

[0017] Fig. 12 is an enlarged view of one lens area of ​​the light field display device illustrated in Fig. 11.

[0018] FIG. 13 illustrates an example in which the arrangement direction of the first lens and the second lens is changed in the light field display device illustrated in FIG. 11.

[0019] Fig. 14 illustrates an example of a light field display device illustrated in Fig. 11 with an additional barrier.

[0020] Hereinafter, a light field display device according to various embodiments will be described in detail with reference to the accompanying drawings. The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of the various embodiments of the present disclosure defined by the claims and their equivalents. While it includes various specific details to facilitate understanding, these should be considered merely exemplary. Accordingly, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. Furthermore, descriptions of known functions and configurations may be omitted for clarity and brevity.

[0021] The terms and words used in the following description and claims are not intended to be limited by their bibliographic meanings, but rather have been used by the inventors solely to facilitate a clear and consistent understanding of the present invention. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and is not intended to limit the present disclosure as defined by the appended claims and their equivalents.

[0022] In the drawings below, identical reference numerals designate identical components, and the sizes of individual components may be exaggerated for clarity and convenience. Terms such as "first," "second," etc. may be used to describe various components, but the components should not be limited by these terms. These terms are used solely to distinguish one component from another.

[0023] Singular expressions include plural expressions unless the context clearly indicates otherwise. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather implies that other components may be included, unless otherwise specifically stated. Furthermore, the size and thickness of each component in the drawings may be exaggerated for clarity. Furthermore, when a given material layer is described as existing on a substrate or another layer, the material layer may be in direct contact with the substrate or another layer, or a third layer may exist between the layers. Furthermore, the materials forming each layer in the examples below are exemplary, and other materials may also be used.

[0024] Additionally, terms such as “part”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

[0025] The specific implementations described in this embodiment are examples and are not intended to limit the technical scope in any way. For the sake of brevity of the specification, descriptions of conventional electronic components, control systems, software, and other functional aspects of the systems may be omitted. Furthermore, the lines connecting or connecting members between components depicted in the drawings are merely illustrative of functional connections and / or physical or circuit connections, and may be replaced or represented as various additional functional connections, physical connections, or circuit connections in an actual device.

[0026] The use of the term “above” and similar referential terms may refer to both singular and plural.

[0027] The steps of a method may be performed in any order, unless explicitly stated otherwise. Furthermore, the use of any exemplary terms (e.g., "for example," "etc.") is intended merely to illustrate technical concepts and does not limit the scope of the claims, unless otherwise specified.

[0028] Any function or operation described in the present disclosure may be processed by a single processor or a combination of processors. A single processor or a combination of processors is a circuit that performs processing and includes circuits such as an application processor (AP, e.g., a central processing unit (CPU)), a communication processor (CP, e.g., a modem), a graphics processing unit (GPU), a neural processing unit (NPU) (e.g., an artificial intelligence (AI) chip), a Wi-Fi chip, a Bluetooth® chip, a global positioning system (GPS) chip, a near field communication (NFC) chip, a connection chip, a sensor controller, a touch controller, a fingerprint sensor controller, a display drive integrated circuit (IC), an audio codec chip, a universal serial bus (USB) controller, a camera controller, an image processing IC, a microprocessor unit (MPU), a system on a chip (SoC), an integrated circuit (IC), and the like.

[0029] FIG. 1 illustrates a light field display device according to an exemplary embodiment.

[0030] A light field display device (100) includes a display panel (110) that emits light to form an image, a first lens array (120) provided on the display panel (110) and having a plurality of first lenses (121) arranged therein, and a second lens array (140) arranged spaced apart from the first lens array (120) and having a plurality of second lenses (141) arranged therein.

[0031] The display panel (110) may include an LCD, an LCoS (Liquid Crystal on Silicon), an OLED display, an LED display, or a projector. The display panel (110) may process an image signal to form a two-dimensional image or a three-dimensional image. Alternatively, the light field display device (110) may include a CGH (computed generated holography) to form a holographic image.

[0032] The first lens (121) of the first lens array (120) may be a convex lens. The first lens array (120) may have a plurality of first lenses (121) arranged in a row or in a matrix form. For example, the first lens array (120) may be a lenticular lens array or a micro lens array.

[0033] The second lens (141) of the second lens array (140) may be a convex lens. The second lens array (140) may have a plurality of second lenses (141) arranged in a row or in a matrix form. For example, the second lens array (140) may be a lenticular lens array or a micro lens array.

[0034] The first lens (121) of the first lens array (120) and the second lens (141) of the second lens array (140) may be arranged to face each other. The focal length of the first lens array (120) may be the same as the focal length of the second lens array (140). Alternatively, the focal length of the first lens array (120) may be different from the focal length of the second lens array (140).

[0035] The light field display device (100) may include a barrier (130). The barrier (130) may include a plurality of apertures (131). Light emitted from the display panel (110) may travel through the apertures (131). Depending on the size of the apertures (131), the transmittance of the light may vary, and crosstalk of the light may be reduced. The barrier (130) may be disposed at any one of the following locations: between the display panel (110) and the first lens array (120), between the first lens array (120) and the second lens array (140), and in front of the second lens array (140).

[0036] The central axis of curvature of the first lens (121) of the first lens array (120), the central axis of the aperture (131) of the barrier (130), and the central axis of curvature of the second lens (141) of the second lens array (140) may be aligned. The first lens (121), the aperture (131), and the second lens (141) may constitute one sub-pixel.

[0037] FIG. 2 is an enlarged view of the first lens (121) of the first lens array (120) and the second lens (141) of the second lens array (140). The distance (D1) between the display panel (110) and the first lens (121) of the first lens array (120) may be smaller than the focal length (f1) of the first lens array (120). By arranging the display panel (110) at a location shorter than the focal length (f1) of the first lens array (120), the image light from the display panel (110) can be continuously diverged when passing through the first lens (121), and the divergence angle of the light passing through the first lens (121) can be reduced to be smaller than the divergence angle of the light from the display panel (110).

[0038] The barrier (130) can reduce crosstalk of light passing through the first lens array (120) by adjusting the aperture (131). That is, the barrier (130) can prevent light rays causing crosstalk from passing through by adjusting the size of the aperture (1310).

[0039] The second lens array (140) can cause the light passing through the barrier (130) to become parallel rays. Here, the parallel rays can indicate that the angle of the marginal rays is within 1 degree with respect to the chief ray. Since the light passing through the second lens array (140) becomes parallel rays, the viewer can watch a 3D image. The distance (D2) between the display panel (110) and the second lens array (140) can be substantially equal to the composite focal length of the first lens array (120) and the second lens array (140).

[0040] The composite focal length of the first lens array (120) and the second lens array (140) can satisfy the following equation.

[0041] <Formula 1>

[0042] Here, f represents the composite focal length of the first lens array (120) and the second lens array (140), f1 represents the focal length of the first lens array (120), f2 represents the focal length of the second lens array (140), and a represents the distance between the chief points of the first lens array (120) and the second lens array (140).

[0043] When the distance (D2) between the second lens array (140) and the display panel (110) is equal to the combined focal length of the first lens array (120) and the second lens array (140), light passing through the second lens array (140) can become parallel light. As a result, a three-dimensional image can be displayed. Meanwhile, the light field display device (100) can have a viewing angle (θ) of 60 degrees or more. By having a wide viewing angle, a viewer can view a three-dimensional image in a wide range.

[0044] FIG. 3 illustrates an example in which the arrangement directions of the first lens array (120) and the second lens array (140) are reversed compared to FIG. 1. In the light field display device (100A), the first lens (121) of the first lens array (120) may be arranged to face the display panel (110). In addition, the second lens (141) of the second lens array (140) may be arranged symmetrically with the first lens (121). That is, the second lens (141) of the second lens array (140) may be arranged to face the front of the light field display device (100A).

[0045] Figure 4 shows images produced by a lens-based light field display device of a comparative example at viewing angles of -60 degrees, -30 degrees, 0 degrees, 30 degrees, and 60 degrees. The lens-based light field display device of the comparative example is equipped with a single lens array. In this case, the left and right sides of the image are reversed at viewing angles of -60 degrees and 60 degrees. It is difficult for the lens-based light field display device of the comparative example to secure a viewing angle of more than 60 degrees.

[0046] Figure 5 shows images by the light field display device (100) illustrated in Figure 1 at viewing angles of -60 degrees, -30 degrees, 0 degrees, 30 degrees, and 60 degrees. Even at viewing angles of -60 degrees and 60 degrees, the images are displayed three-dimensionally without left-right inversion.

[0047] Figure 6 shows that the aperture (131) of the barrier (130) is variable.

[0048] The barrier (130) may be configured to electrically control the aperture ratio. The barrier (130) may include a liquid crystal layer. However, the barrier (130) is not limited thereto. For example, in FIG. 6, the aperture ratio (B1) of the aperture (131) located on the left side of the barrier (130) may be controlled to be greater than the aperture ratio (B2) of the aperture (131) located on the right side of the barrier (130). The aperture ratio may represent the ratio of the area through which light passes to the total area based on one area of ​​the lens. The aperture ratio may be controlled within a range of 50-100%.

[0049] Fig. 7 illustrates a case where the aperture ratio of the aperture (131) is relatively large, and Fig. 8 illustrates a case where the aperture ratio of the aperture (131) is relatively small. The aperture ratio of the aperture (131) can be adjusted according to the three-dimensional information of the image. In an area where the three-dimensional effect is small in the image, the pixel data of different views are similar, so the impact of image quality degradation due to crosstalk is small. Therefore, even if the aperture ratio of the aperture (131) is made relatively large, the side effects due to crosstalk are small, and a high-brightness image can be obtained because the aperture ratio is made large. On the other hand, in an area where the three-dimensional effect is large in the image, the sensitivity due to crosstalk is high, so the aperture ratio can be adjusted relatively small to reduce the crosstalk. As a result, an image with good image quality can be displayed in an area where the three-dimensional effect is large.

[0050] Stereoscopic information can include, for example, disparity between views. Areas with less stereoscopic effect may have smaller disparities, while areas with greater stereoscopic effect may have larger disparities.

[0051] As shown in Fig. 7, for an area with a small disparity, a high-brightness image can be obtained by increasing the aperture ratio of the aperture (131) to increase the amount of light passing through the aperture (131).

[0052] As shown in Fig. 8, for areas with large disparity, the aperture ratio of the aperture (131) can be made small to reduce crosstalk, thereby providing a stereoscopic image with good image quality.

[0053] Figures 9 and 10 are drawings for explaining a method for controlling the aperture ratio of a barrier.

[0054] Referring to Fig. 9, a multi-view image for displaying a stereoscopic image is acquired (S10). Stereoscopic information can be acquired by quantitatively analyzing the stereoscopic effect according to an area within the image (S20). Referring to Fig. 6, the light field display device (100) may include an analysis unit (133) that analyzes stereoscopic effect information, and an aperture ratio control unit (134) that controls the aperture ratio of the barrier (130) according to the stereoscopic effect information. The analysis unit (133) may provide the acquired stereoscopic effect information to the aperture ratio control unit (134). The aperture ratio control unit (134) may control the aperture ratio of the barrier (130) according to an area based on the stereoscopic effect information received from the analysis unit (133) (S30).

[0055] Referring to FIG. 10, the analysis unit (133) can analyze the disparity between views that represents a three-dimensional effect according to an area within the image (S21). The analysis unit (133) can quantitatively analyze the three-dimensional effect to generate a disparity map (S22). Based on the disparity map, the analysis unit (133) can adjust the aperture ratio of the barrier to a large extent for an area with a small disparity and to a small extent for an area with a large disparity (S23).

[0056] When the disparity by region of the image is α, the aperture ratio of the barrier (130) can be expressed as (100-kα). Here, k can be a constant determined by the material of the barrier (130), desired crosstalk, brightness, etc. In this way, by adjusting the aperture ratio of the barrier (130) according to the three-dimensional information in the image, a high-brightness and high-quality three-dimensional image can be provided.

[0057] FIG. 11 illustrates a light field display device according to an exemplary embodiment.

[0058] A light field display device (200) may include a display panel (210) that emits light to form an image, a first lens array (220) provided on the display panel (210), a second lens array (230) arranged adjacent to the first lens array (220), and a third lens array (240) arranged adjacent to the second lens array (230).

[0059] The first lens array (220) may have a plurality of first lenses (221) arranged in a row or in a matrix shape. The first lens (221) may be a convex lens. The first lens array (220) may be a lenticular lens array or a micro lens array. The second lens array (230) may have a plurality of second lenses (231) arranged in a row or in a matrix shape. The second lens (231) may be a convex lens. The second lens array (230) may be a lenticular lens array or a micro lens array. The third lens array (330) may have a plurality of third lenses (241) arranged in a row or in a matrix shape. The third lens (241) may be a concave lens. The third lens (241) may be a lenticular lens array or a micro lens array.

[0060] The first lens array (220) and the second lens array (230) can be arranged so that the first lens (221) and the second lens (231) face each other. The third lens (241) can be arranged so that its concave shape faces the second lens array (220). However, the third lens (241) can also be arranged so that its concave shape faces away from the second lens array (230). The first lens (221), the second lens (231), and the third lens (241) can be arranged so that their central axes of curvature are aligned.

[0061] Fig. 12 is an enlarged view of one lens area of ​​the light field display device (200) illustrated in Fig. 11.

[0062] The gap (D1) between the display panel (210) and the first lens array (220) may be smaller than the focal length of the first lens array (220). Meanwhile, a layer (234) may be further provided between the second lens array (230) and the third lens array (240). The layer (234) is provided to maintain the gap between the second lens array (230) and the third lens array (240), and may include a material having the same refractive index as the second lens array (230).

[0063] The first lens array (220) and the second lens array (230) can display a three-dimensional image by providing images of different views to the viewer by converting the image light emitted from the display panel (210) into parallel light. The third lens array (240) can play a role of making the effective focal length shorter than the distance (D3) between the display panel (210) and the third lens array (240). Here, the effective focal length can represent a composite focal length by the first lens array (220), the second lens array (230), and the third lens array (240). The composite focal length of the first lens array (220), the second lens array (230), and the third lens array (240) can be shorter than the distance (D3) between the display panel (210) and the third lens array (240). In addition, the composite focal length of the first lens array (220), the second lens array (230), and the third lens array (240) may be shorter than the composite focal length of the first lens array (220) and the second lens array (230). As a result, a lens array having a short focal length can be used, which means that a high LPI (Lens per inch) lens can be used, thereby increasing the resolution of the light field display device. The focal length of the first lens array (220) may be the same as or different from the focal length of the second lens array (230).

[0064] Fig. 13 illustrates that the arrangement directions of the first lens array (220) and the second lens array (230) are reversed compared to the light field display device illustrated in Fig. 11. Components using the same reference numbers in Fig. 13 as in Fig. 11 are substantially the same components, and thus a detailed description thereof will be omitted here.

[0065] In the light field display device (200A), the first lens (221) of the first lens array (220) may be arranged to face the display panel (210). In addition, the second lens (231) of the second lens array (230) may be arranged symmetrically with the first lens (221). That is, the second lens (231) of the second lens array (230) may be arranged to face the front of the light field display device (200A). Even if arranged in this manner, the light field display device (200A) may have the same effect as the light field display device (200).

[0066] Fig. 14 illustrates an example of a light field display device illustrated in Fig. 13 with an additional barrier.

[0067] The light field display device (200B) may include a barrier (250) between the first lens array (220) and the second lens array (230). The barrier (250) may include a plurality of apertures (251). The barrier (250) may adjust the aperture ratio of the apertures (251). The light field display device (200B) may include an analysis unit (133) that analyzes three-dimensional information of an image, and an aperture ratio adjustment unit (134) that adjusts the aperture ratio of the barrier according to the three-dimensional information. Since the analysis unit (133) and the aperture ratio adjustment unit (134) are the same as those described with reference to FIG. 6, a detailed description thereof will be omitted here.

[0068] As described above, the present disclosure can secure a wide viewing angle of 60 degrees or more and display high-brightness stereoscopic images. Therefore, users can enjoy high-quality stereoscopic images over a wide viewing angle range.

[0069] An exemplary embodiment can provide a light field display device having high brightness and a wide viewing angle.

[0070] A light field display device according to an exemplary embodiment includes a display panel that emits light to form an image. A first lens array is provided on the display panel and has a structure in which a plurality of first lenses are arranged. A second lens array is arranged spaced apart from the first lens array and has a structure in which a plurality of second lenses are arranged. A barrier is arranged between the display panel and the first lens array, between the first lens array and the second lens array, or in front of the second lens array. The barrier has an aperture through which the light is transmitted.

[0071] The distance between the display panel and the first lens array may be shorter than the focal length of the first lens array.

[0072] The distance between the display panel and the second lens array may be equal to the combined focal length of the first lens array and the second lens array.

[0073] The combined focal length of the first lens array and the second lens array can satisfy the following equation.

[0074] Food

[0075]

[0076] Here, f represents the composite focal length of the first lens array and the second lens array, f1 represents the focal length of the first lens array, f2 represents the focal length of the second lens array, and a represents the distance between the principal points of the first lens array and the second lens array.

[0077] The above barrier can be configured to have an electrically adjustable aperture ratio.

[0078] The above light field display device may further include an analysis unit that analyzes three-dimensional information of the image.

[0079] The light field display device may further include an aperture ratio control unit that adjusts the aperture ratio of the barrier according to the three-dimensional information provided from the analysis unit.

[0080] The above three-dimensional information may include a disparity map.

[0081] The first lens of the first lens array and the second lens of the second lens array are convex lenses, and the first lens and the second lens can be arranged to face each other.

[0082] The first lens of the first lens array and the second lens of the second lens array may be convex lenses, the first lens may be arranged to face the display panel, and the second lens may be arranged symmetrically with the first lens.

[0083] A light field display device according to an exemplary embodiment may include a display panel that emits light to form an image. A first lens array may be provided on the display panel, and may have a structure in which a plurality of first lenses are arranged. A second lens array may be arranged adjacent to the first lens array, and may have a structure in which a plurality of second lenses are arranged. A third lens array may be arranged adjacent to the second lens array, and may have a structure in which a plurality of third lenses are arranged.

[0084] The first lens of the first lens array may be a convex lens, the second lens of the second lens array may be a convex lens, and the third lens of the third lens array may be a concave lens.

[0085] The third lens of the third lens array may be positioned toward the display panel.

[0086] The combined focal length of the first lens array, the second lens array, and the third lens array may be shorter than the distance between the display panel and the third lens array.

[0087] The above-described embodiments are merely illustrative, and those skilled in the art will readily appreciate various modifications and equivalent alternative embodiments. Therefore, the true scope of technical protection afforded by the exemplary embodiments should be determined by the technical concepts set forth in the following claims.

Claims

1. A display panel (110) that emits light to form an image; A first lens array (120) provided on the above display panel (110), in which a plurality of first lenses (121) are arranged; A second lens array (140) having a plurality of second lenses (141) arranged spaced apart from the first lens array (120); and A light field display device, comprising a barrier (130) having an aperture that transmits light, the barrier being positioned between the display panel (110) and the first lens array (120), between the first lens array (120) and the second lens array (140), and in front of the second lens array (140).

2. In paragraph 1, A light field display device, wherein the distance between the display panel and the first lens array is shorter than the focal length of the first lens array.

3. In paragraph 1, A light field display device, wherein the distance between the display panel and the second lens array is equal to the composite focal length of the first lens array and the second lens array.

4. In paragraph 3, A light field display device, wherein the composite focal length of the first lens array and the second lens array satisfies the following equation. <food> Here, f represents the composite focal length of the first lens array and the second lens array, f1 represents the focal length of the first lens array, f2 represents the focal length of the second lens array, and a represents the distance between the principal points of the first lens array and the second lens array.

5. In paragraph 1, A light field display device, wherein the above barrier is configured to have an electrically adjustable aperture ratio.

6. In paragraph 1, A light field display device further comprising an analysis unit that analyzes three-dimensional information of the image, and an aperture ratio control unit that adjusts the aperture ratio of the barrier according to the three-dimensional information provided from the analysis unit.

7. In paragraph 6, A light field display device, wherein the three-dimensional information includes a disparity map.

8. A display panel (210) that emits light to form an image; A first lens array (220) provided on the above display panel (210), in which a plurality of first lenses (221) are arranged; A second lens array (230) arranged adjacent to the first lens array (220), in which a plurality of second lenses (231) are arranged; and A light field display device, including a third lens array (240) in which a plurality of third lenses (241) are arranged adjacent to the second lens array (230).

9. In paragraph 8, A light field display device, wherein the first lens of the first lens array is a convex lens, the second lens of the second lens array is a convex lens, and the third lens of the third lens array is a concave lens.

10. In paragraph 9, A light field display device, wherein the third lens of the third lens array is positioned toward the display panel.

11. In paragraph 8, A light field display device, wherein the distance between the display panel and the first lens array is shorter than the focal length of the first lens array.

12. In paragraph 8, A light field display device, wherein the composite focal length of the first lens array, the second lens array, and the third lens array is shorter than the distance between the display panel and the third lens array.

13. In paragraph 8, A light field display device further comprising a barrier having an aperture that transmits light, the barrier being positioned between the display panel and the first lens array, between the first lens array and the second lens array, and between the second lens array and the third lens array.

14. In paragraph 8, A light field display device further comprising an analysis unit that analyzes three-dimensional information of the image, and an aperture ratio control unit that adjusts the aperture ratio of the barrier according to the three-dimensional information provided from the analysis unit.

15. In paragraph 14, A light field display device, wherein the three-dimensional information includes a disparity map.

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