Mini-LED display submodule and large-size naked-eye 3D display device

Abstract

The invention relates to a Mini-LED display submodule and a large-size naked-eye 3D display device. The Mini-LED display submodule comprises a display panel, a first grating layer and a second grating layer which are arranged in sequence. The display panel comprises a plurality of pixel units, the first grating layer comprises a plurality of first lenses, and the first lenses are used for converting emergent light rays emitted by the corresponding pixel units into collimated light rays; the focal points of the multiple first lenses are arranged in a coplanar mode, light rays passing through the first lenses can be converted into collimated light rays with unified parameters, the multiple pixel units and the multiple first lenses are arranged in a one-to-one correspondence mode, independent regulation and control of single emergent light rays can be achieved, and the problem of cross crosstalk of different emergent light rays is greatly solved in combination with collimation processing of the first lenses; by arranging the second grating layer, directional refraction can be carried out on the collimated light rays output by different first grating layers, the collimated light rays after refraction are respectively projected to different viewpoint positions in the space, and naked eye 3D display can be realized.

Description

Technical Field

[0001] This invention relates to the field of glasses-free 3D technology, and in particular to a Mini-LED display submodule and a large-size glasses-free 3D display device. Background Technology

[0002] With the continuous development of display technology, glasses-free 3D display technology has attracted widespread attention because it can present 3D visual effects without requiring viewers to wear special glasses. Traditional LCD (Liquid Crystal Display) screens cannot be made in large sizes and their brightness is insufficient for outdoor use. LED screens, with their advantages of high brightness, wide viewing angle, and long lifespan, have huge application potential in the field of glasses-free 3D display.

[0003] However, in the related technologies, the naked-eye 3D display technology of LED (Light Emitting Diode) screens usually uses a single-layer grating structure to achieve the 3D effect. However, since LEDs themselves have a certain emission angle, and the light intensity of LEDs in different positions varies when displayed on a large screen, it is easy to cause uneven light intensity on the screen. Especially in the edge area of ​​the screen, the light intensity attenuation is more obvious. This uneven light intensity will not only seriously affect the display quality of 3D images, making the 3D stereoscopic effect in different areas different and reducing the viewing experience of the audience, but also increase the crosstalk of 3D images and limit the viewing angle, further affecting the effect of naked-eye 3D display. Summary of the Invention

[0004] Therefore, it is necessary to provide a Mini-LED display sub-module and a large-size naked-eye 3D display device that can avoid the problem of uneven light intensity, reduce crosstalk, and improve the display quality of 3D images, so as to provide viewers with a clearer and more comfortable naked-eye 3D viewing experience.

[0005] A Mini-LED display submodule includes a display panel, a first grating layer, and a second grating layer arranged sequentially. The display panel includes multiple pixel units, and the display panel is a Mini-LED display panel; The first grating layer includes a plurality of first lenses, the focal points of the plurality of first lenses are coplanarly arranged, and the plurality of pixel units are configured in one-to-one correspondence with the plurality of first lenses; the first lens is used to convert the outgoing light emitted by the corresponding pixel unit into collimated light. The second grating layer is used to directionally refract the collimated light rays output from different first lenses, so that the refracted collimated light rays are projected to different viewpoints in space.

[0006] In one embodiment, the second grating layer includes a plurality of second lenses, each second lens being configured to correspond to a plurality of first lenses.

[0007] In one embodiment, a plurality of first lenses are arranged in a first direction, and a plurality of second lenses are arranged in a second direction, with an angle between the first direction and the second direction.

[0008] In one embodiment, a first optically transparent adhesive layer is disposed between the display panel and the first grating layer, and a second optically transparent adhesive layer is disposed between the first grating layer and the second grating layer; And / or, a protective layer is provided on the side of the second grating layer away from the first grating layer.

[0009] In one embodiment, the refractive index of both the first and second optically transparent adhesive layers is N1, the refractive index of both the first and second grating layers is N2, and the absolute value of the difference between N2 and N1 is ≥0.1.

[0010] In one embodiment, the refractive index of the first grating layer is the same as that of the second grating layer.

[0011] This application also provides a large-size naked-eye 3D display device, including multiple Mini-LED display sub-modules as described above, wherein the multiple Mini-LED display sub-modules are arranged in a spliced ​​manner.

[0012] In one embodiment, the first grating layer on each Mini-LED display submodule has a preset offset relative to the corresponding display panel.

[0013] In one embodiment, the preset offset of the first grating layer of the plurality of Mini-LED display submodules is different from each other.

[0014] In one embodiment, the second lenses on two adjacent Mini-LED display submodules are arranged in a continuous manner.

[0015] In the above scheme, by setting the focal planes of multiple first lenses to be coplanar, the light-emitting surfaces of all pixel units are within the range of the focal planes of the first lenses. This ensures that the light emitted by all pixel units can be converted into collimated light with uniform parameters after passing through the first lenses, making the collimated light highly uniform in intensity distribution, avoiding the problem of uneven light intensity, and making the light intensity of various areas of the screen tend to be consistent. This provides a uniform light basis for the differentiated directional refraction of multiple collimated light by the second grating layer.

[0016] By configuring multiple pixel units to correspond one-to-one with multiple first lenses, the outgoing light rays of each pixel unit are only incident on the corresponding first lens, which enables independent control of a single outgoing light ray. Combined with the collimation processing of the first lens, the problem of crosstalk between different outgoing light rays is greatly avoided, ensuring the independence and clarity of the image pixels.

[0017] By setting a second grating layer, the collimated light rays output from different first grating layers can be directionally refracted, allowing the refracted collimated light rays to be projected onto different viewpoints in space. This enables naked-eye 3D display. Furthermore, the second grating layer is for directional refraction of collimated light rays without crosstalk, eliminating the need for additional correction of divergent light rays. This reduces light deviation during the refraction process and ensures that each collimated light ray can be accurately projected onto the preset viewpoint, improving the clarity and accuracy of multi-viewpoint display. Consequently, it enhances the display quality of 3D images, providing viewers with a clearer and more comfortable naked-eye 3D viewing experience. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a Mini-LED display submodule according to an embodiment of this application.

[0021] Figure 2 This is a partial structural schematic diagram of a Mini-LED display submodule according to an embodiment of this application.

[0022] Figure 3 This is another structural schematic diagram of a Mini-LED display submodule shown in one embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the structure of a large-size glasses-free 3D display device according to an embodiment of this application.

[0024] Figure 5 This is a schematic diagram of the structure of a large-size glasses-free 3D display device according to another embodiment of this application.

[0025] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0026] Figure 7 for Figure 5 Enlarged view of section B in the middle.

[0027] Figure 8 This is a light intensity curve diagram from different viewpoints shown in an embodiment of this application; Figure 9 This is a light intensity curve diagram from different viewpoints shown in an embodiment of the related technology; Figure 10 This is a comparison of the total light intensity curves of a single-layer grating in the Mini-LED display sub-module and related technologies of this application at the same location.

[0028] Explanation of reference numerals in the attached figures: 10. Mini-LED display submodule; 100. Display panel; 110. Pixel unit; 200. First grating layer; 300. Second grating layer; 400. First optically transparent adhesive layer; 500. Second optically transparent adhesive layer; 600. Protective layer; 700. Viewing plane. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiments of this application relate to a Mini-LED display submodule 10, including a display panel 100, a first grating layer 200 and a second grating layer 300 arranged sequentially, with the display panel 100, the first grating layer 200 and the second grating layer 300 arranged sequentially along the light emission direction.

[0034] The display panel 100 includes multiple pixel units 110, and the display panel 100 is a Mini-LED display panel. It should be noted that Mini-LED has the inherent advantages of high brightness and high pixel density. Each pixel unit 110 has high light emission brightness and fast response speed, providing a high-quality and stable basic light source for the subsequent light control of the first grating layer 200 and the second grating layer 300.

[0035] Specifically, the display panel 100 includes multiple pixel units 110 arranged in a periodic array, with three RGB LEDs forming a group, one each for red, green, and blue LEDs, forming an independent pixel unit 110. The LEDs are spaced evenly in the horizontal left-right and vertical up-down directions, forming a uniform light-emitting array.

[0036] It should be noted that the single pixel unit 110 can be driven independently at the pixel level. The three RGB LEDs of the pixel unit 110 can achieve independent grayscale and brightness control. The driving signal can be accurately transmitted to each LED without signal crosstalk or delay, ensuring the color mixing accuracy and dynamic control capability of the three colors in the single pixel unit 110, and providing a precise electrical signal control basis for the differentiated image output of subsequent multi-viewpoint displays.

[0037] The first grating layer 200 includes a plurality of first lenses, the focal points of which are coplanarly arranged, and a plurality of pixel units 110 are configured in one-to-one correspondence with the plurality of first lenses. The first lenses are used to convert the outgoing light rays emitted by the corresponding pixel unit 110 into collimated light rays.

[0038] The second grating layer 300 is used to directionally refract the collimated light rays output from different first lenses, so that the refracted collimated light rays are projected to different viewpoints in space.

[0039] By setting the focal planes of multiple first lenses to be coplanar, the light-emitting surfaces of all pixel units 110 can be within the coplanar range of the focal planes of the first lenses. This ensures that the light emitted by all pixel units 110 can be converted into collimated light with uniform parameters after passing through the first lenses, making the collimated light highly uniform in intensity distribution, avoiding the problem of uneven light intensity, and making the light intensity of various areas of the screen tend to be consistent. This provides a uniform light basis for the differentiated directional refraction of multiple collimated light by the second grating layer 300.

[0040] By configuring multiple pixel units 110 to correspond one-to-one with multiple first lenses, the outgoing light rays of each pixel unit 110 are only incident on the corresponding first lens, which enables independent control of a single outgoing light ray. Combined with the collimation processing of the first lens, the problem of crosstalk between different outgoing light rays is greatly avoided, ensuring the independence and clarity of the image pixels.

[0041] By setting a second grating layer 300, the second grating layer 300 can directionally refract the collimated light rays output from different first grating layers 200, so that the refracted collimated light rays are projected to different viewpoints in space, realizing naked-eye 3D display. Moreover, the second grating layer 300 is for directional refraction of collimated light rays without crosstalk, without the need for additional correction of divergent light rays, reducing light deviation during the refraction process, ensuring that each collimated light ray can be accurately projected to the preset viewpoint position, improving the clarity and accuracy of multi-viewpoint display, thereby improving the display quality of 3D images and giving viewers a clearer and more comfortable naked-eye 3D viewing experience.

[0042] The light control design of the dual grating layer in this application is highly compatible with the high pixel density and high brightness characteristics of Mini-LED, fully amplifying its high-definition display advantages and significantly improving the display clarity, visual experience and display stability under directional viewing angles.

[0043] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, the second grating layer 300 includes a plurality of second lenses, with each second lens configured to correspond to a plurality of first lenses.

[0044] The first grating layer 200 further includes a first substrate, on which a plurality of first lenses are disposed. The first grating layer 200 further includes a second substrate, on which a plurality of second lenses are disposed. Exemplarily, both the first substrate and the second substrate are made of transparent optical materials, such as resin or optical glass, with a visible light transmittance ≥90%.

[0045] By configuring a single second lens corresponding to multiple first lenses, multiple collimated rays output from the first grating layer 200 can be precisely incident on the corresponding single second lens. The incident aperture of the second lens matches the output range of the multiple collimated rays, which can avoid light intensity loss caused by light leakage. At the same time, the uniformity of light intensity brought about by the coplanar focal points of the first lenses can ensure that the light intensity of multiple rays incident on a single second lens is consistent. After superposition, the light intensity distribution at the target viewpoint is more uniform, without local light intensity deviation. Furthermore, the directional refraction distribution of multiple collimated rays by a single second lens can avoid viewpoint shift caused by the refraction angle deviation of multiple independent second lenses, while reducing light intensity loss during refraction, improving the overall stability and accuracy of directional refraction, and ensuring that the light intensity and angle of the image from different viewpoints remain consistent.

[0046] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, a plurality of first lenses are arranged in a first direction, and a plurality of second lenses are arranged in a second direction, with an angle between the first and second directions. Specifically, the plurality of first lenses are arranged in a regular array in the first direction, and the plurality of second lenses are arranged in a regular array in the second direction. Exemplarily, the first direction is the Y direction.

[0047] It should be noted that the angle between the first direction and the second direction is not limited in this application. The angle between the first direction and the second direction has a corresponding relationship with the number of spatial viewpoints and the pixel length of the display panel 100. For example, the angle between the first direction and the second direction is θ = arctan(1 / 6) = 9.46°.

[0048] For example, when the number of spatial viewpoints increases, the angle between the first direction and the second direction needs to be increased to expand the angular range of the directional refraction of the second lens, so that multiple collimated rays can be projected onto more viewpoints at different positions, avoiding image blurring caused by viewpoint overlap, while ensuring that the light intensity received by each viewpoint is not weakened; when the pixel length of the display panel 100 increases, the space occupied by a single pixel unit 110 and the corresponding first lens increases, so the angle needs to be reduced to allow the collimated rays of multiple first lenses to be more concentratedly incident on the corresponding second lens, avoiding light intensity loss caused by incident deviation, while adapting to the light propagation path after the pixel length increases, ensuring stable light intensity superposition effect.

[0049] By setting an angle between the first direction and the second direction, the collimated light rays from multiple first lenses can be incident on the corresponding second lenses in a more orderly manner, avoiding the intersection and interference of collimated light rays from different first lenses on the light-incident surface of the second lens, further eliminating light crosstalk, and reducing light intensity loss caused by incident deviation. At the same time, the angle is adapted to the number of spatial viewpoints and the pixel length of the display panel 100, which allows the light rays after directional refraction by the second lens to be projected more accurately to the preset viewpoint position, avoiding viewpoint offset, and ensuring a more uniform distribution of light intensity received by each viewpoint.

[0050] It should be noted that the surface microstructure of the first and second lenses can be spherical, aspherical, or freeform. This application does not specifically limit the surface microstructure of the first and second lenses, and they can be set according to the optical functional requirements. For example, the first and second lenses are cylindrical lenses. Cylindrical lenses can better adapt to the directional transmission and refraction requirements of collimated light rays, taking into account both light intensity utilization and refractive accuracy.

[0051] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, a first optically transparent adhesive layer 400 is disposed between the display panel 100 and the first grating layer 200, and a second optically transparent adhesive layer 500 is disposed between the first grating layer 200 and the second grating layer 300. The first optically transparent adhesive layer 400 enables tight adhesion between the display panel 100 and the first grating layer 200. The second optically transparent adhesive layer 500 enables tight adhesion between the first grating layers 200.

[0052] Specifically, the refractive index of both the first optically transparent adhesive layer 400 and the second optically transparent adhesive layer 500 is N1, and the refractive index of both the first grating layer 200 and the second grating layer 300 is N2, with the absolute value of the difference between N2 and N1 being ≥0.1. For example, 1.42≤N1≤1.55, 1.55≤N2≤1.68.

[0053] The first optically transparent adhesive layer 400 and the second optically transparent adhesive layer 500 have high light transmittance and low refractive index deviation, which can effectively reduce the reflection and refraction loss of light at the interface between the display panel 100 and the first grating layer 200 and the first grating layer 200 and the second grating layer 300, thus ensuring efficient light transmission.

[0054] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, a protective layer 600 is provided on the side of the second grating layer 300 away from the first grating layer 200. The protective layer 600 is made of an optically transparent and wear-resistant optical material, which is anti-reflective, anti-fingerprint, and can also protect the second lens of the second grating layer 300 from external damage, while not affecting the directional refraction function and light transmission efficiency of the second grating layer 300. Exemplarily, the material used for the protective layer 600 is COC (Cyclic Olefin Copolymer) optical-grade engineering plastic.

[0055] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, the refractive index of the first grating layer 200 is the same as that of the second grating layer 300, which can ensure that the optical characteristics of the first grating layer 200 and the second grating layer 300 are consistent, so that the collimation effect of the first lens and the directional refraction effect of the second lens form a precise synergy, and avoid the light transmission shift and increased light intensity loss caused by the difference in refractive index of the two grating layers.

[0056] In this embodiment, the RGB LEDs on the display panel 100 can emit R, G, and B three-color light with a divergence angle of 120°-160°. This large-angle divergence light first passes through the low-refractive-index first optically transparent adhesive layer 400, and then enters the high-refractive-index first grating layer 200. The multiple first lenses of the first grating layer 200 are configured one-to-one with the multiple pixel units 110. The net aperture of the first grating layer 200 (the net aperture is the effective light transmission of the first lens in the first grating layer 200) is... The aperture of the region is matched with the aperture of the transmitted light (the transmitted light is the light emitted from the pixel unit 110 of the display panel 100 and incident on the first grating layer 200), and the focal length of the first lens is consistent with the distance from the pixel unit 110 to the front surface of the first grating layer 200. The large-angle divergent light is incident from the front surface of the first grating layer 200, and after being refracted by the curved surface of the rear surface of the first grating layer 200, it is emitted as collimated light with a divergence angle of less than or equal to 10°, concentrating the light energy in the core propagation direction.

[0057] Collimated light rays are incident on the front surface of a second optically transparent adhesive layer 500 with a low refractive index, exit from the rear surface of the second optically transparent adhesive layer 500, and then incident on the front surface of a second grating layer 300 with a high refractive index. Each second lens in the second grating layer 300 corresponds to multiple first lenses. The second grating layer 300, through these multiple second lenses, directionally refracts the collimated light rays output from different first lenses, projecting the refracted collimated light rays to different viewpoints in space. Ultimately, the second grating layer 300 guides the image light rays from different viewpoints to the left and right eye fields of the viewer, allowing both eyes to receive image signals with parallax, thereby achieving a clear naked-eye 3D display effect.

[0058] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiments of this application also relate to a large-size naked-eye 3D display device, including multiple Mini-LED display sub-modules 10, which are arranged in a spliced ​​manner.

[0059] By arranging multiple Mini-LED display sub-modules 10 in a splicing manner, the size limitation of a single Mini-LED display sub-module can be overcome, enabling the construction of large-size or even ultra-large naked-eye 3D display panels 100. This meets the naked-eye 3D needs of large-size display scenarios such as public displays, commercial large screens, exhibition hall giant screens, and commercial advertising. Moreover, the splicing design adapts to customized needs of different sizes, providing greater flexibility. At the same time, it significantly reduces the processing difficulty, yield loss, and production cost of large-size panels. Furthermore, when a large screen is damaged, only a single module component needs to be replaced, greatly reducing maintenance costs.

[0060] Each Mini-LED display sub-module 10 adopts the same double-layer grating layer optical control scheme to ensure that the light output collimation and viewpoint orientation of each sub-module are consistent, effectively avoiding optical effect deviation, image breakage or viewpoint misalignment at the splicing point, realizing the overall and continuous display of large-size naked-eye 3D images and improving the visual experience.

[0061] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, the first grating layer 200 on each Mini-LED display submodule 10 has a preset offset relative to the corresponding display panel 100. Specifically, the first grating layer 200 on each Mini-LED display submodule 10 has a preset offset relative to the corresponding display panel 100 in the X direction.

[0062] Each Mini-LED display sub-module 10 has a first grating layer 200 with a preset offset relative to the corresponding display panel 100. By adjusting the preset offset, the emission angle of the collimated light emitted from the first grating layer 200 can be changed, thereby achieving precise control of the light propagation angle of a single Mini-LED display sub-module 10. This ensures that the center of the emitted light from each Mini-LED display sub-module 10 is aligned with the optimal observation position, thereby making the emitted light intensity of different areas of the entire large-size screen more consistent and improving the visual integrity of the spliced ​​display.

[0063] It should be noted that this application does not limit the number of Mini-LED display sub-modules 10. Any number of Mini-LED display sub-modules 10 can be spliced ​​according to actual usage needs to meet the requirements of large-size screens.

[0064] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, the preset offsets of the first grating layers 200 of the plurality of Mini-LED display submodules 10 are different from each other.

[0065] Due to the differences in the splicing spatial positions of each Mini-LED display sub-module 10, different preset offsets can be used to ensure that the light emission angle of each Mini-LED display sub-module 10 after splicing forms a continuous and orderly angular gradient along the splicing direction, solving the problems of viewpoint overlap and image discontinuity at the splicing point and achieving seamless connection of light across the entire area; the light angle of each sub-module can be independently adjusted, and the offset can be flexibly adjusted according to the overall viewpoint distribution requirements, ensuring the continuity and integrity of the naked-eye 3D visual experience.

[0066] It should be noted that the preset offset of the first grating layer 200 is determined by the position of the Mini-LED display sub-module 10 on the large screen. The farther the Mini-LED display sub-module 10 is from the center of the large screen, the larger the preset offset of the first grating layer 200 on the Mini-LED display sub-module 10.

[0067] Please see Figure 1 , Figure 5 , Figure 6 and Figure 7 For example, a, b, and c are three different Mini-LED display sub-modules 10.

[0068] At the center of the large screen, the first raster layer 200 of a remains in the same position relative to the display panel 100. The distance between the display panel 100 and the viewing plane 700 is L, and the focal length of the first raster layer 200 is f.

[0069] The distance between the center position of b and the center position of the large screen in the X direction is L1, the angle between the line connecting the center position of b and the center position of the observation plane 700 and the Z direction is θ1, and the preset offset of the first grating layer 200 of b relative to the corresponding display panel 100 in the X direction is d1.

[0070] The distance between the center position of c and the center position of the large screen in the X direction is L2; ​​the angle between the line connecting the center position of c and the center position of the observation plane 700 and the Z direction is θ2; and the preset offset of the first raster layer 200 of c relative to the corresponding display panel 100 in the X direction is d2. The above parameters satisfy the following relationship:

[0071]

[0072] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, optionally, the second lenses on two adjacent Mini-LED display submodules 10 are arranged in a continuous manner.

[0073] The second lenses on two adjacent Mini-LED display sub-modules 10 are arranged continuously, which can eliminate the optical discontinuity of the gap between the second lenses at the splicing point, so that the spliced ​​second grating layer 300 forms a complete and continuous optical control surface, ensuring the seamless connection of the light refracted by the corresponding second lenses of different Mini-LED display sub-modules 10, further optimizing the overall integrity of the large-size screen, avoiding viewpoint shift and screen fragmentation caused by the discontinuity of the second lenses, and improving the continuity and integrity of the naked-eye 3D visual experience.

[0074] The light intensity curves from different viewpoints shown in one embodiment of this application are as follows: Figure 8 As shown in the figure. A related art embodiment illustrates light intensity curves from different viewpoints, as shown in the figure. Figure 9 As shown. Specifically, the embodiments in this application have the same number of viewpoints as those in related technologies. Figure 8 and Figure 9 It is known that the light intensity of this application is about 25% higher than that of related technologies.

[0075] For example, the crosstalk calculation formula is as follows:

[0076] Where Crosstalk is the crosstalk coefficient; v represents the different viewpoints preset in the space; and n is the total number of viewpoints in the space. This represents the position corresponding to the maximum light intensity at viewpoint v. Calculations show that the crosstalk of the double-layer grating in this application is 14.5%, while the crosstalk of the single-layer grating in related technologies is 4.8%, representing a reduction of approximately 10% in crosstalk.

[0077] A comparison of the total light intensity curves of the double-layer grating layer in this application and the single-layer grating in related technologies at the same location is shown in the figure below. Figure 10 As shown. The coordinate values ​​on the horizontal axis represent the angle between the line connecting the center position of the Mini-LED display submodule 10 and the center position of the observation plane 700 and the Z direction.

[0078] For example, the formula for calculating light intensity uniformity is as follows:

[0079] in, This represents the maximum total light intensity. This represents the minimum total light intensity.

[0080] Depend on Figure 10 It is known that the light intensity uniformity of the double-layer grating layer in this application is 90.8%, while the light intensity uniformity of the single-layer grating in the related technology is 76.1%. The light intensity uniformity of this application is 14.7% higher than that of the related technology.

[0081] The large-size naked-eye 3D display device proposed in this application fully utilizes the light energy of the display panel 100 by employing the first grating layer 200. Compared with a single-layer grating, the light intensity is increased by 25%. At the same time, because the first grating layer 200 collimates the emitted light from the display panel 100, the crosstalk of this application is reduced by 10%, and the light intensity uniformity is improved by 14.7%. Moreover, compared with conventional LCD screens, the Mini-LED display sub-module 10 can be infinitely spliced, making it more suitable for large-size screens. In addition, the Mini-LED display sub-module 10 has higher brightness, ensuring clear imaging even in bright ambient light conditions, making it more suitable for outdoor use.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A Mini-LED display submodule (10), characterized in that, It includes a display panel (100), a first grating layer (200) and a second grating layer (300) arranged sequentially; The display panel (100) includes a plurality of pixel units (110), and the display panel (100) is a Mini-LED display panel (100); The first grating layer (200) includes a plurality of first lenses, the focal points of the plurality of first lenses are coplanarly arranged, and the plurality of pixel units (110) are configured in a one-to-one correspondence with the plurality of first lenses; the first lens is used to convert the outgoing light emitted by the corresponding pixel unit (110) into collimated light. The second grating layer (300) is used to directionally refract the collimated light rays output from different first lenses, so that the refracted collimated light rays are projected to different viewpoints in space.

2. The Mini-LED display submodule (10) according to claim 1, characterized in that, The second grating layer (300) includes a plurality of second lenses, each of which is configured to correspond to a plurality of first lenses.

3. The Mini-LED display submodule (10) according to claim 2, characterized in that, A plurality of first lenses are arranged in a first direction, and a plurality of second lenses are arranged in a second direction, with an angle between the first direction and the second direction.

4. The Mini-LED display submodule (10) according to claim 2, characterized in that, A first optically transparent adhesive layer (400) is disposed between the display panel (100) and the first grating layer (200), and a second optically transparent adhesive layer (500) is disposed between the first grating layer (200) and the second grating layer (300); And / or, a protective layer (600) is provided on the side of the second grating layer (300) away from the first grating layer (200).

5. The Mini-LED display submodule (10) according to claim 4, characterized in that, The refractive indices of the first optically transparent adhesive layer (400) and the second optically transparent adhesive layer (500) are both N1, the refractive indices of the first grating layer (200) and the second grating layer (300) are both N2, and the absolute value of the difference between N2 and N1 is ≥0.

1.

6. The Mini-LED display submodule (10) according to claim 2, characterized in that, The refractive index of the first grating layer (200) is the same as that of the second grating layer (300).

7. A large-size glasses-free 3D display device, characterized in that, It includes multiple Mini-LED display sub-modules (10) as described in any one of claims 1-6, and the multiple Mini-LED display sub-modules (10) are arranged in a spliced ​​manner.

8. The large-size glasses-free 3D display device according to claim 7, characterized in that, The first grating layer (200) on each of the Mini-LED display sub-modules (10) has a preset offset relative to the corresponding display panel (100).

9. The large-size glasses-free 3D display device according to claim 8, characterized in that, The preset offset of the first grating layer (200) of the multiple Mini-LED display sub-modules (10) is different from each other.

10. The large-size glasses-free 3D display device according to claim 7, characterized in that, The second lenses on two adjacent Mini-LED display sub-modules (10) are arranged in a continuous pattern.

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