Laminating film and display device

Abstract

The utility model discloses a laminating film and a display device, and relates to the technical field of optical films. The laminating film comprises a first base material layer, a second base material layer and an adhesive layer, the first prism parts are sequentially arranged on the first base material layer in an array mode in the preset direction; the second base material layer is arranged on the first prism part far away from one side of the first base material layer; the second prism parts and the first prism parts are arranged in the same direction, and the second prism parts are sequentially arranged on the second base material layer on the side away from the first prism parts in an array mode; the third base material layer is arranged on the second prism part far away from one side of the second base material layer; and a trapezoid-like structure. According to the utility model, the problems that the brightness uniformity at the horizontal visual angle is still poor and the required spatial brightness uniformity index cannot be reached due to the limitation of the strong light receiving capability of the prism structure along the inclined plane direction of the microstructure at present are solved.

Description

Adhesive film and display device Technical Field

[0001] This utility model relates to the field of optical film technology, and in particular to a bonding film and a display device. Background Technology

[0002] With the iterative development of modern lighting technology, some products are required to improve the uniformity of the image and viewing angle while ensuring a certain level of brightness, that is, to meet the TCO03 visual angle spatial uniformity requirement, so that viewers can see the content of the display screen clearly from different viewing angles.

[0003] Regarding the issue of improving viewing angle uniformity, current methods limit the light-gathering ability of the prism structure along the inclined surface of the microstructure, resulting in unsatisfactory brightness uniformity at the horizontal viewing angle, failing to meet the required spatial brightness uniformity index. No effective solution has yet been proposed to address these problems. Summary of the Invention

[0004] Purpose of the utility model: To provide a bonding film and a display device to at least solve one of the problems existing in the prior art.

[0005] Technical solution: A bonding film, comprising:

[0006] First substrate layer;

[0007] A plurality of first prism portions are sequentially arrayed on the first substrate layer along a preset direction;

[0008] The second substrate layer is disposed on the first prism portion on the side away from the first substrate layer;

[0009] A plurality of second prism portions are arranged in the same direction as the first prism portion and are arranged in an array on the second substrate layer on the side away from the first prism portion.

[0010] A third substrate layer is disposed on the second prism portion on the side away from the second substrate layer; and

[0011] A trapezoidal structure is arranged in a spaced array on the third substrate layer on the side away from the second prism portion;

[0012] The trapezoidal structure, the third substrate layer, the second prism portion, the second substrate layer, the first prism portion, and the first substrate layer are sequentially bonded from top to bottom to form a composite optical film with high brightness and improved uniformity of spatial viewing angle brightness.

[0013] Preferably, the trapezoidal structure is axially symmetric, and the cross-section of the trapezoidal structure is two isosceles trapezoids in the same direction.

[0014] Preferably, the inclined surface of the trapezoidal structure is composed of two inclined surfaces with unequal slopes;

[0015] The inclined plane includes a first inclined plane and a second inclined plane, wherein the angle between the first inclined plane and the horizontal line is greater than the angle between the second inclined plane and the horizontal line.

[0016] Preferably, the trapezoidal structure contains a plurality of diffusing particles.

[0017] Preferably, the microstructure orientations of the first prism portion and the second prism portion are set at an angle ranging from 20° to 90°.

[0018] Preferably, the first prism part is an isosceles right-angle prism with equal or unequal height and a bottom width of 50-100μm.

[0019] Preferably, the second prism part is an isosceles right-angle prism with equal or unequal height and a bottom width of 10-100 μm.

[0020] Preferably, the spacing between adjacent trapezoidal structures is 2-50 μm.

[0021] Preferably, adjacent trapezoidal structures employ non-coplanar microstructures that vibrate vertically.

[0022] To achieve the above objectives, according to another aspect of this application, a display device is also provided.

[0023] The display device according to this application includes the bonding film as described above.

[0024] Beneficial effects: In this embodiment, a trapezoidal structure is stacked, and the trapezoidal structure, the third substrate layer, the second prism portion, the second substrate layer, the first prism portion, and the first substrate layer are sequentially and orderly bonded from top to bottom to form a composite optical film with high brightness and improved spatial viewing angle brightness uniformity. This achieves the purpose of secondary diffusion of light converged by the prism structure to a specific angle, thereby improving the brightness in the 30° left and right viewing angle range and the 15° up and down viewing angle range, thus obtaining a better technical effect of spatial viewing angle brightness uniformity. This solves the technical problem that the current light-gathering ability of the prism structure along the inclined surface of the microstructure is limited, resulting in poor brightness uniformity in the horizontal viewing angle and failure to meet the required spatial brightness uniformity index. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the bonding film structure of this utility model;

[0026] Figure 2 is a trapezoidal optical path diagram of the bonding film of this utility model; and

[0027] Figure 3 is a schematic diagram of the trapezoidal structure of the bonding film of this utility model.

[0028] The attached figures are labeled as follows:

[0029] 10. First substrate layer;

[0030] 20. First prism section;

[0031] 30. Second substrate layer;

[0032] 40. Second prism section;

[0033] 50. Third substrate layer;

[0034] 60. Trapezoidal structure; 601. First inclined plane; 602. Second inclined plane;

[0035] A1, First inclined plane region;

[0036] A2, Second inclined plane region;

[0037] B. Planar area. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] As shown in Figures 1-3, this application relates to a laminating film and a display device. As shown in Figure 1, the laminating film includes: a first substrate layer 10; the first substrate layer 10 serves as the bottom support structure of the entire optical film, and is typically made of a material with high light transmittance and low birefringence (such as PET or PMMA), with a thickness of approximately 50-200 μm; of course, the material and specifications of the first substrate layer 10 can be adjusted according to actual usage requirements, and this application does not impose any limitations.

[0043] A plurality of first prism portions 20 are arranged in a sequential array on the first substrate layer 10 along a preset direction; by adopting a periodic array arrangement structure to arrange a plurality of first prism portions 20 on the first substrate layer 10, good optical performance can be ensured. The preset direction can be the horizontal direction shown in the figure.

[0044] It should be noted that the first substrate layer 10 and the first prism portion 20 form the first prism structure.

[0045] The second substrate layer 30 is disposed on the first prism portion 20 on the side away from the first substrate layer 10; it can achieve a good load-bearing effect, thereby achieving a good interlayer fit effect.

[0046] A plurality of second prism portions 40 are arranged in the same direction as the first prism portion 20 and are arranged in an array on the second substrate layer 30 on the side away from the first prism portion 20. By keeping the direction consistent with the first prism portion 20, a "double prism superposition" effect is formed, which can achieve a good arrangement effect and thus ensure good optical performance.

[0047] It should be noted that the second substrate layer 30 and the second prism portion 40 form a second prism structure.

[0048] The prism section is typically made of a material with a high refractive index, which causes light to refract or reflect as it passes through, thereby achieving the desired optical effect. The refractive index is usually >1.5.

[0049] In optical devices and systems, prism layers are commonly used to modulate, separate, or control light. For example, in liquid crystal displays (LCDs), prism layers can be used to adjust the direction of light propagation, thereby achieving a high-brightness display effect at a normal viewing angle.

[0050] The third substrate layer 50 is disposed on the second prism portion 40 on the side away from the second substrate layer 30; it can achieve a good load-bearing effect, thereby ensuring a good interlayer fit effect.

[0051] A trapezoidal structure 60 is arranged in a spaced array on the third substrate layer 50 on the side away from the second prism portion 40. By adopting a left-right symmetrical shape and redistributing the remaining discrete light through Fresnel reflection of the sidewalls and refraction of the top plane, it can also suppress moiré patterns and reduce the risk of interference with the display panel pixels by randomizing the spaced array.

[0052] The trapezoidal structure 60, the third substrate layer 50, the second prism portion 40, the second substrate layer 30, the first prism portion 20, and the first substrate layer 10 are sequentially bonded from top to bottom to form a composite optical film with high brightness and improved spatial viewing angle brightness uniformity. By bonding two prism structures together with one trapezoidal structure 60, the light excessively concentrated by the prism layers is diffused a second time in the left and right viewing angle directions. This effectively improves the brightness over a wide viewing angle while maintaining the high brightness caused by the prism sheet, thereby enhancing the spatial viewing angle brightness uniformity.

[0053] Specifically, as shown in Figure 1, although the actual microstructure extension direction is not reflected in the figure. The lower layer is a first prism structure, the middle layer is a second prism structure, and the upper layer is a trapezoidal structure. The first and second prism structures are placed at an angle of 20° to 90° between their microstructure extension directions, while the upper trapezoidal structure extends in the same direction as the first prism structure.

[0054] The structure of this application has high brightness and better spatial viewing angle brightness uniformity, so as to meet the spatial viewing angle brightness uniformity requirements of TCO03.

[0055] As can be seen from the above description, this application achieves the following technical effects:

[0056] In this embodiment, a trapezoidal structure 60 is stacked. The trapezoidal structure 60, the third substrate layer 50, the second prism part 40, the second substrate layer 30, the first prism part 20, and the first substrate layer 10 are sequentially bonded from top to bottom to form a composite optical film with high brightness and improved spatial viewing angle brightness uniformity. This achieves the purpose of secondary diffusion of light converged by the prism structure to a specific angle, thereby improving the brightness in the 30° left-right viewing angle and 15° up-down viewing angle range, and thus obtaining a better spatial viewing angle brightness uniformity. This solves the technical problem that the current limitation of the strong light-gathering ability of the prism structure along the inclined surface of the microstructure results in poor brightness uniformity in the horizontal viewing angle, and the inability to achieve the required spatial brightness uniformity index.

[0057] Furthermore, the trapezoidal structure 60 is axially symmetric, and its cross-section consists of two isosceles trapezoids in the same direction. It is understood that by setting the cross-section of the trapezoidal structure 60 to be isosceles trapezoids in the same direction, a good matching effect can be achieved, while also ensuring good light guidance and adjustment effects. Here, the same direction can be a vertical direction; the isosceles trapezoidal structure is an isosceles trapezoid with its base below its top edge, and the length of the base edge is greater than the length of the top edge.

[0058] Furthermore, the inclined plane of the trapezoidal structure 60 adopts two inclined planes with unequal slopes;

[0059] The inclined plane includes a first inclined plane 601 and a second inclined plane 602, wherein the angle between the first inclined plane 601 and the horizontal line is greater than the angle between the second inclined plane 602 and the horizontal line. It is understood that the angles of light distribution are expanded through reflection and refraction by inclined planes with different slopes; simultaneously, setting the angle between the first inclined plane 601 and the horizontal line to be greater than the angle between the second inclined plane 602 and the horizontal line achieves good processing and forming effects, while also ensuring that the inclined planes fulfill their corresponding functions, thereby expanding the angle of view and increasing the brightness of the incident light after passing through the laminating film.

[0060] Specifically, as shown in Figure 2, the upper trapezoidal structure is a trapezoidal structure 60 with slopes of unequal gradients. When light passes through different slopes and planes at the same angle, it will exit at different angles. The sloped areas can converge the light towards the positive viewing angle, while the plane areas can guide the light to a wider viewing angle range, thereby expanding the effective viewing angle while maintaining high brightness at the positive viewing angle. When combined with the bottom two-layer prism structure, it can effectively redistribute the excessively converged light from the prism structure, increasing the brightness at a wider viewing angle and improving the brightness uniformity of the spatial viewing angle.

[0061] As shown in Figure 3, light rays incident at the same angle onto different inclined planes or planes will exit at different angles, thereby expanding the viewing angle. Furthermore, the inclined plane structure can concentrate the light rays towards the center, thereby increasing the luminance within the optical viewing angle.

[0062] Furthermore, the trapezoidal structure 60 contains a plurality of diffusing particles. It is understood that diffusing particles with a different refractive index than the material of the trapezoidal structure 60 are embedded within it. These particles act as secondary scattering sources of light, further enhancing the scattering effect and making the light distribution more uniform. The introduction of diffusing particles also helps to balance the light intensity distribution in different directions, reducing visual color differences and brightness unevenness. Through their unique scattering characteristics, the diffusing particles ensure a more uniform distribution of light within and after the trapezoidal structure 60, improving the overall consistency of the image and viewing comfort. Complementing the sloping design of the trapezoidal structure 60, the diffusing particles further broaden the light scattering range, allowing the optical film to achieve a high level of viewing effect at different angles.

[0063] Preferably, the particle size of the diffusing particles is in the range of 0.5-5 μm. It is understood that within this particle size range, the diffusing particles can effectively promote the uniform distribution of light in the medium, reduce the spotting effect, and maintain the clarity and visual comfort of the medium, avoiding problems caused by excessive scattering due to overly large particles or aggregation due to overly small particles. Setting the particle size of the diffusing particles between 0.5-5 μm helps to efficiently and uniformly scatter light within the medium, thereby improving the coverage and softness of the light source. A suitable particle size range helps to reduce glare and eye strain caused by direct light exposure, improving the visual comfort of the product. Although diffusing particles are added, by precisely controlling the particle size within a small range, the absorption and obstruction of light by the particles can be minimized, thus maintaining the high transparency of the medium.

[0064] Furthermore, the microstructure orientations of the first prism portion 20 and the second prism portion 40 are arranged at an angle ranging from 20° to 90°. This allows for the formation of a "cross-optical structure," avoiding repeated refraction / interference of light caused by completely unidirectional orientation; simultaneously, it also improves the spatial uniformity of light distribution.

[0065] Furthermore, the first prism section 20 is an isosceles right-angle prism with a base width of 50-100μm and either equal or unequal height. This allows for a variety of sizes to be selected, thus adapting to the needs of various applications. Simultaneously, the right-angle prism structure concentrates light in the vertical direction, enhancing the brightness at the center of the screen; equal height facilitates standardized production, while unequal height allows for adjustment of the light output direction, enabling flexible selection.

[0066] Furthermore, the second prism section 40 is an isosceles right-angle prism with a base width of 10-100μm and either equal or unequal height. This allows for a variety of sizes to be selected, thus adapting to the needs of various applications. Simultaneously, the second prism section can be used for higher-angle light control, correcting the output of the first layer, and refined design to enhance edge brightness or compensate for specific areas. The combination of the two prism layers can create a stepped brightness enhancement effect.

[0067] Furthermore, the spacing between adjacent trapezoidal structures 60 is 2-50 μm. This ensures good optical performance; if the spacing is too dense, it will cause mutual interference between structures and increase processing difficulty; conversely, if the spacing is too sparse, it will cause brightness attenuation and poor uniformity. By adopting the spacing range described above, both optical performance and mold manufacturing capabilities can be balanced.

[0068] Furthermore, adjacent trapezoidal structures 60 employ a non-coplanar microstructure with vertical jitter. It is understood that vertical jitter refers to the different heights of the adhesive films; they are not arranged on the same plane, but rather in an alternating manner to create a "jittering" effect.

[0069] The jittered design increases the complexity of the prism array, which can further disperse the reflection and refraction paths of light, thereby increasing the range of optical viewing angles.

[0070] The non-coplanar microstructure means that there are subtle height differences between these laminated films, forming a three-dimensional structure that helps regulate the vertical and horizontal propagation paths of light. This design helps reduce light overlap or shadow effects and improves image sharpness and brightness uniformity.

[0071] Improve the optical viewing angle in the vertical and / or horizontal directions.

[0072] Vertical viewing angle: Due to the up-and-down jitter design of the bonding film, light undergoes multiple refractions and reflections in the vertical direction, thus expanding the viewing angle. This means that users can still obtain a good visual effect when viewing the display device from different heights.

[0073] Horizontal viewing angle: The arrangement of the lamination film also affects the horizontal propagation of light, ensuring that the display device can still present uniform brightness and clear images when the user observes from different horizontal angles.

[0074] Overall viewing angle enhancement: By simultaneously improving the viewing angle in both vertical and horizontal directions, the adhesive film can significantly enhance the overall viewing range of the display, allowing users to clearly see the screen content from multiple angles without affecting the viewing experience due to changes in angle.

[0075] This application improves the optical viewing angle not only in the vertical direction but also in the horizontal direction by setting the optical functional layer structure as a combination of two inclined planes with different slopes and using a non-coplanar microstructure that jitters up and down, while maintaining high luminance.

[0076] Furthermore, the inclined surfaces of the trapezoidal structure 60 are respectively formed by two first inclined surfaces 601 to form a first inclined surface 601 region, and the inclined surfaces of the trapezoidal structure 60 are respectively formed by two second inclined surfaces 602 to form a second inclined surface 602 region, and a planar region B is formed by its top edge; wherein, the slope of the first inclined surface 601 region is different from the slope of the second inclined surface 602 region.

[0077] The slope of the first inclined plane 601 region is different from the slope of the second inclined plane 602 region. The slope refers to the inclination angle of the inclined plane.

[0078] By using different slopes, the degree of refraction of light differs when it passes through the first slope region 601 compared to when it passes through the second slope region 602. This design allows for more precise control and modulation of light to optimize optical performance, such as widening the viewing angle, increasing brightness, or reducing reflections.

[0079] Planar region B is formed by the top edge of the trapezoidal structure 60. As an important component of the bonding film, it is typically a stable surface after light passes through the prism.

[0080] The purpose of different slopes: the slope of the first slope 601 region is larger, while the slope of the second slope 602 region is smaller. This allows light to refract at different intensities in different regions, while also enabling more precise light control, ensuring that light propagates along the designed path, optimizing light distribution, and improving key performance aspects such as viewing angle and brightness.

[0081] Furthermore, the projected width of the first inclined surface 601 region at the bottom is 1-5 μm. It is understood that the minute size of the inclined surface region allows for very fine control of light, enabling effective adjustment of the direction and intensity of light propagation.

[0082] Improved optical performance: Enhanced brightness and uniformity: The small bevel helps reduce optical loss, allowing more light to pass through effectively, thus improving the brightness and brightness uniformity of the display.

[0083] Furthermore, the projected width of the second inclined surface 602 region at the bottom is 1-5 μm. It is understood that by adopting the above settings, the same function as the first inclined surface 601 region can be achieved; further details are omitted here.

[0084] Furthermore, the width of the planar region B is 1-5 μm. It is understood that by setting the width of the planar region B within the above-mentioned range, it can be ensured that the light remains uniformly distributed after entering the bonding film; this width range can optimize the output effect of the light according to optical design requirements, such as: expanding the viewing angle, reducing reflection distortion, or improving brightness uniformity.

[0085] Furthermore, the angle between the first inclined plane 601 and the horizontal line is between 60° and 80°, and the angle between the second inclined plane 602 and the horizontal line is between 50° and 70°. It can be understood that the larger angle (60°-80°) design causes a larger angle of refraction when light enters the bonding film, which helps to significantly change the direction of light propagation.

[0086] The smaller included angle (50°-70°) design, which is slightly smaller than the angle of the first inclined plane 601, allows light to propagate at a slightly gentler angle of refraction or reflection when passing through the prism section, which helps to further adjust and distribute the light along the refraction path.

[0087] Furthermore, the planar region B and the inclined region can have the same or different dimensions. This allows for flexible use, thus meeting the needs of various application scenarios.

[0088] The cross-sectional area is further increased. Understandably, this allows for good light adjustment.

[0089] Furthermore, the non-coplanar microstructure with vertical shaking has a vertical shaking morphology with a height difference of 1.5-2 μm and an undulation period of 450-550 μm. This allows for easy fabrication and shaping while ensuring good vertical shaking performance, thus providing a foundation and guarantee for good optical adjustment. Preferably, the non-coplanar microstructure with vertical shaking has a height difference of 2 μm and an undulation period of 500 μm.

[0090] The following examples further illustrate this point:

[0091] This invention demonstrates its technical effect by comparing the brightness uniformity at 30° left and right and 15° up and down angles and the brightness at a normal viewing angle between different embodiments and comparative examples. The brightness percentage is based on the brightness of Example 1.

[0092] Test method:

[0093] Using a BM-7 luminance meter, following the TCO 03 spatial viewing angle luminance uniformity measurement method, the angular luminance uniformity values ​​for a 30° left-right viewing angle and a 15° up-down viewing angle were calculated.

[0094] Brightness: The brightness of the center point of the image was measured using a BM-7 luminance meter at a normal viewing angle.

[0095] All embodiments must comply with the microstructure setting conditions of this invention.

[0096] Example 1

[0097] The width of the first prism structure is 50 μm, the width of the second prism structure is 25 μm, and the angle between the directions of the first and second prism structures is 90°. The projected width of the first inclined region A1 of the trapezoidal microstructure is 2 μm, the projected width of the second inclined region A2 is 2 μm, the width of the planar region B is 2 μm, the inclination angle 1 of the first inclined surface of the trapezoidal microstructure is 70°, the inclination angle 2 of the second inclined surface is 60°, and the interval length between adjacent trapezoidal microstructures is 5 μm.

[0098] Example 2

[0099] The width of the first prism structure is 50 μm, the width of the second prism structure is 25 μm, and the angle between the directions of the first and second prism structures is 30°. The projected width of the first inclined region A1 of the trapezoidal microstructure is 2 μm, the projected width of the second inclined region A2 is 2 μm, the width of the planar region B is 2 μm, the inclination angle 1 of the first inclined surface of the trapezoidal microstructure is 70°, the inclination angle 2 of the second inclined surface is 60°, and the interval length between adjacent trapezoidal microstructures is 5 μm.

[0100] Example 3

[0101] The width of the first prism structure is 70 μm, the width of the second prism structure is 25 μm, and the angle between the directions of the first and second prism structures is 90°. The projected width of the first inclined region A1 of the trapezoidal microstructure is 2 μm, the projected width of the second inclined region A2 is 2 μm, the width of the planar region B is 2 μm, the inclination angle 1 of the first inclined surface of the trapezoidal microstructure is 70°, the inclination angle 2 of the second inclined surface is 60°, and the interval length between adjacent trapezoidal microstructures is 5 μm.

[0102] Example 4

[0103] The width of the first prism structure is 70 μm, the width of the second prism structure is 50 μm, and the angle between the directions of the first and second prism structures is 90°. The projected width of the first inclined region A1 of the trapezoidal microstructure is 2 μm, the projected width of the second inclined region A2 is 2 μm, the width of the planar region B is 2 μm, the inclination angle 1 of the first inclined surface of the trapezoidal microstructure is 70°, the inclination angle 2 of the second inclined surface is 60°, and the interval length between adjacent trapezoidal microstructures is 5 μm.

[0104] Example 5

[0105] The width of the first prism structure is 50 μm, the width of the second prism structure is 25 μm, and the angle between the directions of the first and second prism structures is 90°. The projected width of the first inclined region A1 of the trapezoidal microstructure is 2 μm, the projected width of the second inclined region A2 is 2 μm, the width of the planar region B is 5 μm, the inclination angle 1 of the first inclined surface of the trapezoidal microstructure is 70°, the inclination angle 2 of the second inclined surface is 60°, and the interval length between adjacent trapezoidal microstructures is 5 μm.

[0106] Example 6

[0107] The width of the first prism structure is 50 μm, the width of the second prism structure is 25 μm, and the angle between the directions of the first and second prism structures is 90°. The projected width of the first inclined region A1 of the trapezoidal microstructure is 2 μm, the projected width of the second inclined region A2 is 2 μm, the width of the planar region B is 2 μm, the inclination angle 1 of the first inclined surface of the trapezoidal microstructure is 60°, the inclination angle 2 of the second inclined surface is 50°, and the interval length between adjacent trapezoidal microstructures is 5 μm.

[0108] Comparative Example 1

[0109] It does not have a top trapezoidal structure. The width of the first prism structure is 50μm, the width of the second prism structure is 25μm, and the angle between the directions of the first prism structure and the second prism structure is 90°.

[0110] Comparative Example 2

[0111] It does not have a top trapezoidal structure. The width of the first prism structure is 50μm, the width of the second prism structure is 25μm, and the angle between the directions of the first prism structure and the second prism structure is 30°.

[0112] The results of each embodiment and comparative example are shown in Table 1:

[0113] Table 1

[0114]

[0115] The test results above show that:

[0116] 1. Compared to the trapezoidal structure architecture of Comparative Example 1, this application achieves better viewing angle brightness uniformity while maintaining a high brightness level, thus meeting the viewing angle brightness uniformity requirements of TCO 03. Specifically, this solution utilizes an additional trapezoidal structure with unequal slopes to effectively increase light intensity at large angles, thereby improving viewing angle brightness uniformity and achieving the design objective.

[0117] 2. In Comparative Example 2, the angle between the two prisms was changed from 90° to 30°. Compared with the 90° architecture, the uniformity of angular brightness can be improved, but the degree is limited and still not as good as the architecture design of this scheme.

[0118] This application also relates to a display device including the bonding film as described above.

[0119] The display device in this embodiment can be any product or component with display function, such as a liquid crystal panel, electronic paper, liquid crystal television, liquid crystal display, digital photo frame, mobile phone, or tablet computer.

[0120] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A bonding film, characterized in that, include: A first substrate layer (10); a plurality of first prism portions (20) arranged in a predetermined array on the first substrate layer (10); a second substrate layer (30) disposed on the first prism portions (20) on the side away from the first substrate layer (10); a plurality of second prism portions (40) arranged in the same direction as the first prism portions (20) and arranged in a predetermined array on the second substrate layer (30) on the side away from the first prism portions (20); a third substrate layer (50) disposed on the side away from the second substrate layer (30). The second prism portion (40) on one side; and the trapezoidal structure (60) are arranged in a spaced array on the third substrate layer (50) on the side away from the second prism portion (40); wherein the trapezoidal structure (60), the third substrate layer (50), the second prism portion (40), the second substrate layer (30), the first prism portion (20) and the first substrate layer (10) are sequentially bonded from top to bottom to form a composite optical film with high brightness and improved spatial viewing angle brightness uniformity.

2. The bonding film according to claim 1, characterized in that, The trapezoidal structure (60) is axially symmetric, and the cross-section of the trapezoidal structure (60) is two isosceles trapezoids in the same direction.

3. The bonding film according to claim 1, characterized in that, The trapezoidal structure (60) has two inclined planes with unequal slopes; the inclined planes include a first inclined plane (601) and a second inclined plane (602), wherein the angle between the first inclined plane (601) and the horizontal line is greater than the angle between the second inclined plane (602) and the horizontal line.

4. The bonding film according to claim 1, characterized in that, The trapezoidal structure (60) contains a number of diffusing particles.

5. The bonding film according to claim 1, characterized in that, The microstructure orientations of the first prism portion (20) and the second prism portion (40) are set within an angle range of 20°-90°.

6. The bonding film according to claim 1, characterized in that, The first prism part (20) is an isosceles right-angle prism with equal or unequal height and a bottom width of 50-100μm.

7. The bonding film according to claim 1, characterized in that, The second prism part (40) is an isosceles right-angle prism with equal or unequal height and a bottom width of 10-100μm.

8. The bonding film according to claim 1, characterized in that, The spacing between adjacent trapezoidal structures (60) is 2-50 μm.

9. The bonding film according to claim 1, characterized in that, The adjacent trapezoidal structures (60) employ a non-coplanar microstructure that vibrates vertically.

10. A display device, characterized in that, Includes the bonding film as described in any one of claims 1-9.

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