Display device and method of manufacturing the same

Abstract

The present disclosure provides a display device and a preparation method thereof. The display device comprises: an array of light emitting elements, a first lens array arranged on the side of the array of light emitting elements in the light emitting direction, and a second lens array arranged on the side of the first lens array away from the array of light emitting elements; each first lens in the first lens array is arranged opposite to one or more light emitting elements in the array of light emitting elements, so that the light emitted by each light emitting element becomes a bundle of collimated light after passing through the corresponding first lens, and all the collimated light has multiple orientations; a gap is left between the second lens array and the first lens array, and each second lens in the second lens array is arranged opposite to multiple first lenses, so that each bundle of collimated light converges into a quasi-point light source with a limited viewing angle range. A brand new implementation scheme of naked-eye stereoscopic display is provided.

Description

Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a display device and a manufacturing method thereof. Background Art

[0002] This section is intended to provide a background or context to the embodiments recited in the claims. No admission is made that the description herein is prior art by virtue of its inclusion in this section.

[0003] High-fidelity three-dimensional display without the need for any equipment has become an inevitable choice for future display technology. This technology is gradually beginning to play an important role in more and more fields such as medical imaging, exhibition display, commercial display and communication media, and has also become a new display solution that countries are vigorously developing.

[0004] Free stereoscopic display technology based on directional backlighting is a display technology that enables naked-eye viewing of 3D images. Directional backlight display technology controls the direction of light emitted by the backlight source, so that the screen image can only be received at a set position in space. With the help of time-division multiplexing technology, the left and right eyes alternately receive only the left and right eye parallax images, and finally, through brain fusion, obtain stereoscopic depth information. Currently, directional backlight technology needs to be combined with human eye tracking technology to solve the problem of limited viewing position. That is, using imaging devices such as cameras to capture the eye coordinates of one or more viewers in real time, determine whether they are in the visible area, and then refresh the display to play the correct left and right eye images based on their position. Summary of the Invention

[0005] The present disclosure provides a display device and a method for manufacturing the same.

[0006] The present disclosure adopts the following technical solution: a display device, comprising: a light-emitting element array, a first lens array arranged on one side of the light-emitting direction of the light-emitting element array, and a second lens array arranged on a side of the first lens array away from the light-emitting element array; each first lens in the first lens array is arranged opposite to one or more light-emitting elements in the light-emitting element array, so that the light emitted by each light-emitting element is converted into a beam of collimated light after passing through the corresponding first lens, and all of the collimated light has multiple directions; a gap is left between the second lens array and the first lens array, and each second lens in the second lens array is arranged opposite to multiple first lenses, so that each beam of collimated light is converged into a quasi-point light source with a limited viewing angle range, wherein the viewing angle range of some quasi-point light sources is different from the viewing angle range of other quasi-point light sources.

[0007] In some embodiments, the light-emitting element array forms sub-pixels of multiple colors, sub-pixels of the same color are arranged into multiple rows along a first direction, a set number of rows of sub-pixels of the same color are adjacent to each other and constitute a sub-pixel group, and sub-pixel groups of different colors are periodically arranged along a second direction, and the first direction and the second direction are two directions parallel to the plane in which the light-emitting element array is located and intersecting with each other.

[0008] In some embodiments, the first lens is a cylindrical lens extending along the first direction, and each of the first lenses is disposed opposite to one or more rows of sub-pixels of the same color arranged along the first direction.

[0009] In some embodiments, the second lens is a cylindrical lens, an extension direction of the second lens intersects with the first direction, and a width of the second lens is greater than or equal to a width of the first lens.

[0010] In some embodiments, the light-emitting element array forms sub-pixels of multiple colors, sub-pixels of the same color are arranged into multiple rows along the second direction, and sub-pixels of different colors are arranged alternately and periodically along the first direction, and the first direction and the second direction are two directions parallel to the plane in which the light-emitting element array is located and intersecting with each other.

[0011] In some embodiments, the first lens is a cylindrical lens extending along the first direction, and each of the first lenses is disposed opposite to one or more rows of sub-pixels arranged along the first direction.

[0012] In some embodiments, the second lenses are cylindrical lenses extending along the first direction, and each of the second lenses is disposed opposite to the same number of the first lenses.

[0013] In some embodiments, the number of light-emitting elements corresponding to each first lens is the same, and the relative position relationship between each light-emitting element and the corresponding first lens is periodically distributed along the second direction.

[0014] In some embodiments, the system further includes: a light-transmitting layer disposed between the first lens array and the light-emitting element array, wherein the light-transmitting layer is divided into a plurality of light-transmitting areas by a black matrix, and the light-transmitting areas are disposed in a one-to-one correspondence with the first lenses.

[0015] The present disclosure adopts the following technical solution: A method for preparing a display device, comprising:

[0016] providing an array of light emitting elements;

[0017] A first lens array is formed on one side of the light emitting direction of the light emitting element array;

[0018] forming a second lens array on a side of the first lens array away from the light emitting element array;

[0019] In which, each first lens in the first lens array is arranged opposite to one or more light-emitting elements in the light-emitting element array, so that the light emitted by each light-emitting element becomes a beam of collimated light after passing through the corresponding first lens, and all of the collimated light has multiple directions; a gap is left between the second lens array and the first lens array, and each second lens in the second lens array is arranged opposite to multiple first lenses, so that each beam of collimated light converges into a quasi-point light source with a limited viewing angle range, wherein the viewing angle range of some quasi-point light sources is different from the viewing angle range of other quasi-point light sources.

[0020] In some embodiments, the method further includes: forming a light-transmitting layer between the first lens array and the light-emitting element array, and forming a black matrix in the light-transmitting layer to divide the light-transmitting layer into a plurality of light-transmitting areas, and the light-transmitting areas are arranged in a one-to-one correspondence with the first lenses.

[0021] Light emitted by the light-emitting elements is refracted by the first and second lens arrays, forming an array of quasi-point light sources in free space. Each point light source in the array has a limited emission angle, and only a portion of the light from these quasi-point light sources is visible from a specific viewing angle. Viewers do not need to wear specific equipment; the image they see differs from different viewing angles. With proper debugging and design, naked-eye 3D display can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the display device according to the embodiment of the present disclosure.

[0023] Figure 2 Schematic diagram of the distribution of the light emitting element array according to the embodiment of the present disclosure.

[0024] Figure 3 Schematic diagram of the distribution of the first lens array of the embodiment of the present disclosure.

[0025] Figure 4 Schematic diagram of the distribution of the second lens array of the embodiment of the present disclosure.

[0026] Figure 5 Schematic diagram of the distribution of light emitting element arrays in other embodiments of the present disclosure.

[0027] Figure 6 Schematic diagram of the distribution of the first lens array of other embodiments of the present disclosure.

[0028] Figure 7 Schematic diagram of the distribution of the second lens array in some other embodiments of the present disclosure.

[0029] Figure 8a and Figure 8b It is a partially enlarged view of the display device according to an embodiment of the present disclosure.

[0030] Figures 9 to 12 Schematic diagrams of several intermediate states of the display device of an embodiment of the present disclosure during its preparation process.

[0031] Among them, the attached marks are: r, red light-emitting element; g, green light-emitting element; b, blue light-emitting element; 1, light-transmitting layer; 11, black matrix; 11a, black UV resin; 12, first lens; 13, second lens. DETAILED DESCRIPTION

[0032] The present disclosure will be further described below with reference to the embodiments shown in the accompanying drawings.

[0033] Figure 1 Schematic diagram of the structure of the display device according to the embodiment of the present disclosure.

[0034] refer to Figure 1 An embodiment of the present disclosure provides a display device, comprising: a light emitting element array, a first lens array arranged on a side of the light emitting direction of the light emitting element array, and a second lens array arranged on a side of the first lens array away from the light emitting element array.

[0035] The light-emitting element may be, for example, an organic light-emitting diode (OLED), a quantum dot light-emitting diode, or a micro-LED. In some embodiments, a single micro-LED chip contains one micro-LED, i.e., one light-emitting element. In other embodiments, a single micro-LED chip contains multiple independently controlled micro-LEDs, i.e., multiple light-emitting elements.

[0036] The light emitting element array is specifically arranged on a display substrate, which is, for example, a glass-based display substrate, or a silicon-based display substrate.

[0037] The display substrate is, for example, an active display substrate, in which pixel circuits corresponding one to one with the light-emitting elements are provided to drive each light-emitting element to light up.

[0038] Figure 1 In the structure shown, multiple red light-emitting elements, multiple green light-emitting elements, and multiple blue light-emitting elements are arranged from left to right, for example, 12 red light-emitting elements r, 12 green light-emitting elements g, and 12 blue light-emitting elements b. Each red light-emitting element r constitutes one red sub-pixel. Each green light-emitting element g constitutes one green sub-pixel. Each blue light-emitting element b constitutes one blue sub-pixel.

[0039] In some other embodiments, the light emitting elements all emit white light, and colored sub-pixels are formed by disposing a color filter (not shown) on the light emitting surface of the light emitting element. The color filter is, for example, disposed between the first lens 12 and the light emitting element.

[0040] Each first lens 12 in the first lens array is arranged opposite to one or more light emitting elements in the light emitting element array, so that the light emitted by each light emitting element becomes a beam of collimated light after passing through the corresponding first lens 12, and all the collimated light has multiple directions.

[0041] The first lens 12 is, for example, a plano-convex lens, a biconvex lens, a biconcave lens, or a positive meniscus lens. The first lens 12 is, for example, a Fresnel lens.

[0042] When the first lens 12 is disposed opposite to a light-emitting element, the orientations of some first lenses 12 can be set to be different from those of other first lenses 12, so that the collimated light emitted from some first lenses 12 has a different orientation from that emitted from other first lenses 12. The orientations of the two first lenses 12 are different, that is, the directions of their principal axes are different.

[0043] When the first lens 12 is arranged relative to the multiple light-emitting elements, the multiple light-emitting elements and the first lens 12 present different relative positional relationships, so that the collimated light emitted by some light-emitting elements after passing through the same first lens 12 and the collimated light emitted by another part of the light-emitting elements after passing through the same first lens 12 have different directions.

[0044] according to Figure 1 At the current viewing angle, some of the red light-emitting elements r below and to the left of the first lens 12 are refracted by the first lens 12 as collimated light, which is then emitted toward the upper right. Some of the green light-emitting elements g directly below the first lens 12 are refracted by the first lens 12 as collimated light, which is then emitted toward the upper right. Some of the green light-emitting elements g below and to the right of the first lens 12 are refracted by the first lens 12 as collimated light, which is then emitted toward the upper left.

[0045] Continue to refer Figure 1 A gap is left between the second lens array and the first lens array, and each second lens 13 in the second lens array is arranged opposite to the multiple first lenses 12, so that each beam of collimated light is converged into a quasi-point light source with a limited viewing angle range, wherein the viewing angle range of some quasi-point light sources is different from the viewing angle range of other parts of the quasi-point light sources.

[0046] The second lens 13 is, for example, a plano-convex lens, a biconvex lens, a biconcave lens, or a positive meniscus lens, and is also, for example, a Fresnel lens.

[0047] according to Figure 1 At this viewing angle, ignoring the gaps between the three red collimated light beams directed toward the upper right and toward the second lens 13, these three red collimated light beams are considered a single collimated light beam. The second lens 13 refracts this red collimated light beam into a single red quasi-point light source. This red quasi-point light source emits light toward the upper right and has a limited viewing angle.

[0048] according to Figure 1 At this viewing angle, ignoring the gaps between the three green collimated light beams directed upward toward second lens 13, these three green collimated light beams are considered a single collimated light beam. Second lens 13 refracts and converges these three green collimated light beams into a single green quasi-point light source. This green quasi-point light source is directed essentially upward and has a limited viewing angle.

[0049] according to Figure 1 At this viewing angle, ignoring the gaps between the three blue collimated light beams directed toward the upper left and toward the second lens 13, these three blue collimated light beams are considered a single collimated light beam. The second lens 13 refracts and converges these three blue collimated light beams into a single blue quasi-point light source. This blue quasi-point light source emits light toward the upper left and has a limited viewing angle.

[0050] If these three beams of red collimated light, three beams of green collimated light, and three beams of blue collimated light are examined independently, the nine beams of collimated light form nine quasi-point light sources on the side of the second lens array away from the first lens array. These nine quasi-point light sources have nine central light emission directions. The nine quasi-point light sources approximately overlap in space. The viewing angle range of these quasi-point light sources is limited, and the central light emission directions of some quasi-point light sources are different from those of others.

[0051] It should be noted that the quasi-point light source described in this disclosure refers to a light source whose area is sufficiently small relative to the user's perception. The light emitting surface of the quasi-point light source can be any suitable shape such as circular, rectangular, regular hexagonal, etc.

[0052] The number of light-emitting elements in a display device is enormous, forming an array of quasi-point light sources in free space. When viewing this array from a specific viewing angle, the user only sees light emitted from a portion of the quasi-point light sources emitting light in a specific direction (that is, light emitted from a portion of the light-emitting elements). When viewing this array from another specific viewing angle, the user only sees light emitted from another portion of the quasi-point light sources emitting light in a specific direction (that is, light emitted from another portion of the light-emitting elements). Viewers do not need to wear specific equipment; the images they see are different from different viewing angles. With proper debugging and design, naked-eye 3D display can be achieved.

[0053] Figure 2 Schematic diagram of the distribution of the light emitting element array according to the embodiment of the present disclosure. Figure 3Schematic diagram of the distribution of the first lens array of the embodiment of the present disclosure. Figure 4 Schematic diagram of the distribution of the second lens array of the embodiment of the present disclosure.

[0054] In some embodiments, reference Figures 2 to 4 The light-emitting element array forms sub-pixels of multiple colors, and the sub-pixels of the same color are arranged into multiple rows along a first direction. A set number of rows of sub-pixels of the same color are adjacent to each other and constitute a sub-pixel group. The sub-pixel groups of different colors are periodically arranged along a second direction. The first direction and the second direction are two directions parallel to the plane where the light-emitting element array is located and intersecting with each other.

[0055] exist Figure 2 In the illustrated embodiment, the light-emitting elements in the display device are periodically arranged along the second direction in the order of red light-emitting element r, red light-emitting element r, green light-emitting element g, green light-emitting element g, blue light-emitting element b, and blue light-emitting element b. Furthermore, light-emitting elements of the same color are aligned along the first direction.

[0056] In some other embodiments, the light emitting elements in the display device are periodically arranged along the second direction with three red light emitting elements r, three green light emitting elements g, and three blue light emitting elements b as a period, and light emitting elements of the same color are aligned along the first direction.

[0057] In some other embodiments, the light-emitting elements in the display device are periodically arranged along the second direction with N red light-emitting elements r, N green light-emitting elements g, and N blue light-emitting elements b as a period. Light-emitting elements of the same color are aligned along the first direction, where N is an integer greater than or equal to 1.

[0058] In some embodiments, the first lenses 12 are cylindrical lenses extending along the first direction, and each first lens 12 is disposed opposite to one or more rows of sub-pixels of the same color arranged along the first direction.

[0059] refer to Figure 3 The single first lens 12 is arranged opposite to two rows of red light emitting elements r arranged along the first direction, or opposite to two rows of green light emitting elements g arranged along the first direction, or opposite to two rows of blue light emitting elements b arranged along the first direction.

[0060] The sizes of the light emitting elements along the second direction are equal, and the sizes along the first direction are periodically distributed in the order of large, small, small, and large.

[0061] The first lens 12 only changes the propagation direction of the light in the second direction and has no effect on the propagation direction of the light in the first direction.

[0062] This can simplify the optical path design of the display device and simplify the structural design of the display device.

[0063] In some embodiments, the second lens 13 is a cylindrical lens, an extension direction of the second lens 13 intersects with the first direction, and a width of the second lens 13 is greater than or equal to a width of the first lens 12 .

[0064] combination Figure 3 and Figure 4 The extending direction of the first lens 12 is different from the extending direction of the second lens 13. The purpose is to reduce or eliminate moiré and adjust the viewpoint continuity.

[0065] In other embodiments, the extending direction of the first lens 12 is the same as the extending direction of the second lens 13 .

[0066] Figure 5 Schematic diagram of the distribution of light emitting element arrays in other embodiments of the present disclosure. Figure 6 Schematic diagram of the distribution of the first lens array of other embodiments of the present disclosure. Figure 7 Schematic diagram of the distribution of the second lens array in some other embodiments of the present disclosure.

[0067] In some embodiments, the light-emitting element array includes sub-pixels of multiple colors, sub-pixels of the same color are arranged in multiple rows along the second direction, and sub-pixels of different colors are arranged alternately and periodically along the first direction. The first direction and the second direction are two directions parallel to the plane in which the light-emitting element array is located and intersect with each other.

[0068] refer to Figure 5 In the light-emitting element array, a row of red sub-pixels arranged along the second direction, a row of green sub-pixels arranged along the second direction, a row of blue sub-pixels arranged along the second direction, a row of red sub-pixels arranged along the second direction, a row of green sub-pixels arranged along the second direction, and a row of blue sub-pixels arranged along the second direction are arranged periodically along the first direction. In each row of sub-pixels arranged along the second direction, sub-pixels with the same position number are aligned along the first direction.

[0069] refer to Figure 6 In some embodiments, the first lens 12 is a cylindrical lens extending along the first direction, and each first lens 12 is disposed opposite to one or more rows of sub-pixels arranged along the first direction.

[0070] refer to Figure 7 In some embodiments, the second lenses 13 are cylindrical lenses extending along the first direction, and each second lens 13 is disposed opposite to the same number of first lenses 12 .

[0071] Figure 7In the illustrated embodiment, the 10 sub-pixels of the same color arranged along the second direction corresponding to the second lens 13 can divide the free space into 10 subdivided viewing angle ranges.

[0072] In some embodiments, the number of light-emitting elements corresponding to each first lens 12 is the same, and the relative position relationship between each light-emitting element and the corresponding first lens 12 is periodically distributed along the second direction.

[0073] refer to Figure 3 Each first lens 12 corresponds to two rows of light-emitting elements arranged along the first direction. In a top perspective view of the display device, the pattern formed by the boundaries of each two first lenses 12 and the corresponding light-emitting elements completely overlaps. In other embodiments, in a top perspective view of the display device, the pattern formed by the boundaries of each first lens 12 and the corresponding light-emitting element completely overlaps.

[0074] Figure 8a and Figure 8b It is a partially enlarged view of the display device according to an embodiment of the present disclosure.

[0075] In some embodiments, reference Figure 8a and Figure 8b The display device further includes: a light-transmitting layer 1 disposed between the first lens array and the light-emitting element array, the light-transmitting layer 1 being divided into a plurality of light-transmitting regions by a black matrix 11, and the light-transmitting regions being disposed in a one-to-one correspondence with the first lenses 12. The light-transmitting layer 1 can be used to adjust the distance between the first lenses 12 and the light-emitting elements. In some embodiments, the light-transmitting layer 1 is colorless and light-transmitting. In other embodiments, the light-transmitting layer 1 is colored and light-transmitting. The black matrix 11 prevents mutual interference between the light emitted by the light-emitting elements facing adjacent first lenses 12.

[0076] Figure 8a In the illustrated embodiment, the distances between the first lens 12 and the plurality of light emitting elements opposite thereto are equal.

[0077] Figure 8b In the illustrated embodiment, the distances between the first lens 12 and the plurality of light emitting elements opposite thereto are slightly different. This is so that the distance from each light emitting element to the center of the first lens 12 is approximately equal to the focal length of the first lens 12 .

[0078] The shapes and sizes of sub-pixels of the same color may be the same or different. The spacing between sub-pixels in a row arranged along the second direction may be equal or unequal. This disclosure does not limit this.

[0079] In the top perspective view of the display device, the first lens 12 may also be in other shapes such as a square, a regular hexagon, or a circle; the first lens 12 may also be in other shapes such as a square, a regular hexagon, or a circle.

[0080] During the display process of the display device, the images within each subdivided viewing angle range can be refreshed simultaneously or sequentially. The images within each subdivided viewing angle range can be displayed simultaneously or in time periods. For example, the multiple light-emitting elements relative to the same first lens 12 are sequentially lit in different time periods, so that quasi-parallel light in different directions is emitted from the first lens 12 in different time periods. The present disclosure does not limit this. The position of the second lens 13 should be appropriately adjusted so that adjacent viewing angle ranges can be overlapped with basically no gaps and basically no overlap, avoiding overlapping or discontinuous visual areas.

[0081] Based on the same inventive concept, an embodiment of the present disclosure further provides a method for manufacturing a display device, comprising:

[0082] providing an array of light emitting elements;

[0083] A first lens array is formed on one side of the light emitting direction of the light emitting element array;

[0084] forming a second lens array on a side of the first lens array away from the light emitting element array;

[0085] Among them, each first lens 12 in the first lens array is arranged opposite to one or more light-emitting elements in the light-emitting element array, so that the light emitted by each light-emitting element becomes a beam of collimated light after passing through the corresponding first lens 12, and all the collimated light has multiple directions; a gap is left between the second lens array and the first lens array, and each second lens 13 in the second lens array is arranged opposite to multiple first lenses 12, so that each beam of collimated light converges into a quasi-point light source with a limited viewing angle range, wherein the viewing angle range of some quasi-point light sources is different from the viewing angle range of other quasi-point light sources.

[0086] Specifically, a light-emitting diode display substrate is provided. A first lens array is formed on a light-emitting surface of the light-emitting diode display substrate. A second lens array can be separated from the first lens array by air. For example, the light-emitting element array and the first lens array are disposed in a frame, and the second lens array is supported by the frame. The second lens array can also be separated from the first lens array by a transparent material.

[0087] In some embodiments, the method further includes: forming a light-transmitting layer 1 between the first lens array and the light-emitting element array, and forming a black matrix 11 in the light-transmitting layer 1 to divide the light-transmitting layer 1 into a plurality of light-transmitting areas, and the light-transmitting areas are arranged relative to the first lenses 12 in a one-to-one correspondence.

[0088] Figures 9 to 12 Schematic diagrams of several intermediate states of the display device of an embodiment of the present disclosure during its preparation process.

[0089] Specifically, referring to 9, a layer of transparent UV resin is first spin-coated on the light-emitting surface of the light-emitting element array, and then the transparent UV resin is exposed, etched and developed to obtain multiple light-transmitting layers 1, each of which covers multiple light-emitting elements corresponding thereto.

[0090] Continue to refer Figure 10 In a vacuum environment, a layer of black UV resin 11 a is spin-coated to fill the vacant areas between adjacent light-transmitting layers 1 and cover the top surface of the light-transmitting layer 1 .

[0091] Continue to refer Figure 11 , the black UV resin 11 a is exposed, etched and developed to obtain the black matrix 11 .

[0092] Continue to refer Figure 12 , a plurality of first lenses 12 are formed on the top surface of the light-transmitting layer 1. The first lens 12 can be formed by photolithography or nanoimprinting. The orthographic projection of the first lens 12 on the light-transmitting layer 1 covers the corresponding light-transmitting layer 1, and the shape and size of the orthographic projection of the first lens 12 on the light-transmitting layer 1 are roughly the same as the overall outer contour of the multiple monochromatic light-emitting elements covered. For example, if the multiple monochromatic light-emitting elements covered by the first lens 12 are arranged in a rectangular array, the orthographic projection of the first lens 12 on the light-transmitting layer 1 is approximately a rectangular shape that covers the rectangular array and slightly exceeds the rectangular array. For another example, if the multiple monochromatic light-emitting elements covered by the first lens 12 are arranged in a circular ring shape, the orthographic projection of the first lens 12 on the light-transmitting layer 1 is approximately a circular shape that covers the circular ring and slightly exceeds the circular ring.

[0093] The orthographic projection of the edge of the first lens 12 on the light-transmitting layer 1 falls on the black matrix 11 between the corresponding light-transmitting layer 1 and the adjacent light-transmitting layer 1. This allows adjacent viewing angles to be seamlessly connected and overlap-free, and avoids crosstalk between adjacent viewing angles.

[0094] In the embodiment of the present disclosure, the principal axis of the second lens 13 is parallel to the principal axis of the first lens 12 it covers.

[0095] The various embodiments in the present disclosure are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0096] The scope of protection of the present disclosure is not limited to the above-described embodiments. Obviously, those skilled in the art may make various modifications and variations to the present disclosure without departing from the scope and spirit of the present disclosure. If such modifications and variations fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations.

Claims

1. A display device, characterized in that: include: A light emitting element array, a first lens array arranged on a side of the light emitting direction of the light emitting element array, and a second lens array arranged on a side of the first lens array away from the light emitting element array; Each first lens in the first lens array is arranged opposite to one or more light-emitting elements in the light-emitting element array, and the first direction and the second direction are two directions parallel to the plane of the light-emitting element array and intersecting with each other. The relative position relationship between each light-emitting element and the corresponding first lens is periodically distributed along the second direction, so that the light emitted by each light-emitting element becomes a beam of collimated light after passing through the corresponding first lens, and all of the collimated light has multiple directions; a gap is left between the second lens array and the first lens array, and each second lens in the second lens array is arranged opposite to multiple first lenses, so that each beam of collimated light converges into a quasi-point light source with a limited viewing angle range, wherein the viewing angle range of some quasi-point light sources is different from the viewing angle range of other parts of the quasi-point light sources.

2. The display device according to claim 1, wherein The light emitting element array forms sub-pixels of multiple colors. Sub-pixels of the same color are arranged in multiple rows along the first direction. A set number of rows of sub-pixels of the same color are adjacent to each other and form sub-pixel groups. Sub-pixel groups of different colors are periodically arranged along the second direction.

3. The display device according to claim 2, wherein: The first lens is a cylindrical lens extending along the first direction, and each of the first lenses is arranged opposite to one or more rows of sub-pixels of the same color arranged along the first direction.

4. The display device according to claim 3, wherein: The second lens is a cylindrical lens, an extension direction of the second lens intersects with the first direction, and a width of the second lens is greater than or equal to a width of the first lens.

5. The display device according to claim 1, wherein The light-emitting element array forms sub-pixels of multiple colors, sub-pixels of the same color are arranged in multiple rows along the second direction, and sub-pixels of different colors are arranged alternately and periodically along the first direction, and the first direction and the second direction are two directions parallel to the plane in which the light-emitting element array is located and intersecting with each other.

6. The display device according to claim 5, wherein: The first lens is a cylindrical lens extending along the first direction, and each of the first lenses is arranged opposite to one or more rows of sub-pixels arranged along the first direction.

7. The display device according to claim 6, wherein: The second lenses are cylindrical lenses extending along the first direction, and each of the second lenses is arranged opposite to the same number of the first lenses.

8. The display device according to claim 1, wherein The number of light-emitting elements corresponding to each of the first lenses is the same.

9. The display device according to claim 1, wherein Also includes: A light-transmitting layer is provided between the first lens array and the light-emitting element array. The light-transmitting layer is divided into a plurality of light-transmitting regions by a black matrix. The light-transmitting regions are provided in a one-to-one correspondence with the first lenses.

10. A method for preparing a display device, characterized in that: include: providing an array of light emitting elements; A first lens array is formed on one side of the light emitting direction of the light emitting element array; forming a second lens array on a side of the first lens array away from the light emitting element array; In which, each first lens in the first lens array is arranged opposite to one or more light-emitting elements in the light-emitting element array, the first direction and the second direction are two directions parallel to the plane of the light-emitting element array and intersecting with each other, and the relative position relationship between each light-emitting element and the corresponding first lens is periodically distributed along the second direction, so that the light emitted by each light-emitting element becomes a beam of collimated light after passing through the corresponding first lens, and all of the collimated light has multiple directions; a gap is left between the second lens array and the first lens array, and each second lens in the second lens array is arranged opposite to multiple first lenses, so that each beam of collimated light converges into a quasi-point light source with a limited viewing angle range, wherein the viewing angle range of some quasi-point light sources is different from the viewing angle range of other parts of the quasi-point light sources.

11. The preparation method according to claim 10, characterized in that: Also includes: A light-transmitting layer is formed between the first lens array and the light-emitting element array, and a black matrix is ​​formed in the light-transmitting layer to divide the light-transmitting layer into a plurality of light-transmitting areas. The light-transmitting areas are arranged in a one-to-one correspondence with the first lenses.

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