Brightness enhancement film and display device

Abstract

The application discloses a brightness enhancement film and a display device, and relates to the technical field of optical films. The brightness enhancement film structure comprises a linear triangular prism structure, a first linear extension columnar structure which is arranged in a first preset angle and is overlaid with the light entrance surface of the linear triangular prism structure, and a second linear extension columnar structure which is arranged in a second preset angle and is overlaid with the first linear extension columnar structure away from one side of the linear triangular prism structure. The linear triangular prism structure, the first linear extension columnar structure and the second linear extension columnar structure are sequentially arranged from top to bottom, and the first linear extension columnar structure and the second linear extension columnar structure are sequentially arranged in the preset rotation direction according to the first preset angle and the second preset angle respectively, with the extension direction of the linear triangular prism structure as the reference. The application solves the problem that the existing light uniformization film still belongs to the diffusion function film category, and the brightness is reduced when a plurality of stacked films are used.

Description

Technical Field

[0001] This invention relates to the field of optical film technology, and more particularly to a brightness enhancement film and a display device. Background Technology

[0002] For novel display designs using mini-LED light sources, multiple light-diffusing films are often used to improve the uniformity of planar light intensity. This involves having one or more light-diffusing films within the module, along with brightness enhancement films and other optical films such as reflective polarizers.

[0003] However, using mini-LED light sources for direct-lit backlighting requires sufficient atomization to completely block the light source's bright spots. To improve shielding, existing diffusion film solutions are no longer suitable; therefore, the industry often uses microstructures to enhance the atomization effect, resulting in various structures for light-diffusing films. In practice, because a single light-diffusing film still does not provide sufficient shielding, multiple stacked films are necessary. However, light-diffusing films still fall under the category of diffusion films, and using multiple stacked films will also cause a reduction in brightness. Currently, no effective solution has been proposed to address these problems. Summary of the Invention

[0004] Objective of the invention: To provide a brightness enhancement film and a display device to at least solve one of the problems existing in the prior art.

[0005] Technical solution: A brightness enhancement film, comprising: A linear triangular prism structure; A first linear extended columnar structure is superimposed on the light-incident surface of the linear triangular prism structure at a first preset angle; and A second linear extension columnar structure is stacked at a second preset angle with the first linear extension columnar structure on the side away from the linear triangular prism structure. The linear triangular prism structure, the first linear extended columnar structure, and the second linear extended columnar structure are stacked in an orderly manner from top to bottom. The extension direction of the linear triangular prism structure is used as the first reference, and the first linear extended columnar structure and the second linear extended columnar structure are arranged in an orderly manner along the preset rotation direction according to the first preset angle and the second preset angle, respectively, to form two sets of intersecting columnar structure layers.

[0006] Preferably, the linear triangular prism structure includes: a first substrate layer connected to the upper surface of the first linear extended columnar structure, wherein a plurality of linear triangular prisms are arrayed on the upper surface of the first substrate layer to form a linear triangular prism layer.

[0007] Preferably, the first linear extended columnar structure includes: a second substrate layer, wherein a plurality of first linear extended columnar prisms are arranged in an array at intervals on the upper surface of the second substrate layer to form a first linear extended columnar prism layer.

[0008] Preferably, the second linear extended columnar structure includes: a third substrate layer, wherein a plurality of second linear extended columnar prisms are arranged in a spaced array on the upper surface of the third substrate layer to form a second linear extended columnar prism layer.

[0009] Preferably, the lower surface of the second linear extended columnar structure is provided with a haze-resistant anti-adsorption coating.

[0010] Preferably, the numerical range of the first preset included angle is 55°-65°.

[0011] Preferably, the second preset angle is the angle between the extension direction of the second linear extended columnar structure and the extension direction of the first linear extended columnar structure, with the extension direction of the first linear extended columnar structure as the second reference, and the numerical range of the second preset angle is 80°-90°. The priority of the first reference is higher than that of the second reference.

[0012] Preferably, the second preset angle is greater than the first preset angle.

[0013] Preferably, the first substrate layer, the second substrate layer, and the third substrate layer are made of PET, PC, PMMA, or PS.

[0014] To achieve the above objectives, according to another aspect of this application, a display device is also provided.

[0015] The display device according to this application includes the aforementioned brightness enhancement film.

[0016] Beneficial effects: In this embodiment, two sets of intersecting columnar structure layers are used. The linear triangular prism structure, the first linear extended columnar structure, and the second linear extended columnar structure are stacked in an orderly manner from top to bottom. With the extension direction of the linear triangular prism structure as the reference, the first linear extended columnar structure and the second linear extended columnar structure are arranged in an orderly manner along a preset rotation direction according to the first preset angle and the second preset angle, respectively, to form two sets of intersecting columnar structure layers. This achieves the purpose of effectively homogenizing the light from the bottom point light source, thereby realizing the technical effect of improving the optical gain function of the film. This solves the technical problem that existing light homogenizing films are still in the category of diffusion films, and the brightness will decrease when multiple films are stacked. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the brightness enhancement film of the present invention; Figure 2 This is a three-dimensional schematic diagram of the linear extended columnar structure of the brightness enhancement film of the present invention; Figure 3 This is a front view schematic diagram of the linear extended columnar structure of the brightness enhancement film of the present invention; and Figure 4 This is an optical path diagram of the linear extended columnar structure of the brightness enhancement film of the present invention.

[0018] The attached figures are labeled as follows: 10. Linear triangular prism structure; 101. First substrate layer; 102. Linear triangular prism; 20. First linear extended columnar structure; 201. Second substrate layer; 202. First linear extended columnar prism; 30. Second linear extended columnar structure; 301. Third substrate layer; 302. Second linear extended columnar prism; 40. Anti-haze coating. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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 invention based on the specific circumstances.

[0022] 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.

[0023] like Figure 1-4 As shown, this application relates to a brightness enhancement film and a display device. Figure 1 As shown, this brightness enhancement film includes: a linear triangular prism structure 10, a first linear extended columnar structure 20, and a second linear extended columnar structure 30. The linear triangular prism structure 10 refers to a classic brightness enhancement film structure, in which numerous slender microprisms with isosceles right-angled cross-sections are arranged parallel to each other on the film surface. Each prism extends on the film surface like a "line," hence the name linear. It is the main working layer for light convergence, enabling it to provide basic and efficient brightness enhancement. When light enters the prism layer from below, part of the light undergoes total internal reflection within the prism structure and is then re-entered from the inclined surface of another adjacent prism, thus being recycled. The other part of the light is directly refracted out. The final effect is to significantly concentrate the light that was originally scattered in all directions within a ±35-degree viewing angle range perpendicular to the film surface, greatly improving the forward brightness.

[0024] Of course, the linear extended columnar structure 20 and the second linear extended columnar structure 30 can have the same structure, as... Figure 2 As shown, it is a trapezoidal strip microstructure with a rectangular or approximately rectangular cross-section. This structure has a light guiding function, and due to total internal reflection, incident light can be transmitted within the strip structure.

[0025] It is important to know that the brightness enhancement film is a key optical film in the backlight module (the light source system of the LCD screen). Its core function is to concentrate the light emitted from the light source below, which has a large divergence angle, into the direction of view (perpendicular to the screen) through the principles of refraction and reflection, thereby increasing the peak brightness of the screen and reducing power consumption.

[0026] Described from the lowest level of architecture upwards. A second linear extension columnar structure 30 is superimposed on the first linear extension columnar structure 20 on the side away from the linear triangular prism structure 10 at a second preset angle, resulting in the following... Figure 3 The superimposed structure shown; Among them, the second linear extended columnar structure 30 refers to the second auxiliary structure located at the bottom layer, which is a series of parallel linear extended columnar bodies, and its cross-sectional shape and size are the same as those of the first columnar structure.

[0027] Stacking according to the second preset angle means that the extension direction of the second columnar structure, relative to the extension direction of the first columnar structure above it, also maintains a preset angle (the second preset angle).

[0028] like Figure 4 As shown, the above scheme enables multi-dimensional, blind-spot-free light control. The bottommost second linear extended columnar structure 30 first conducts light transmission in one direction through the incident light from the bottom point LEDs, forming a strip-like light source. After adding the first linear extended columnar structure 20, secondary optical modulation can be performed in another direction (relative to the second columnar structure layer), forming another strip-like light source. The two columnar structures work together to form a two-dimensional light diffusion network, allowing the light to achieve a more comprehensive and uniform distribution in the horizontal XY plane before entering the upper prism structure, thus achieving a homogenization effect.

[0029] A first linear extended columnar structure 20 is stacked with the light-incident surface of the linear triangular prism structure 10 at a first preset angle; the first linear extended columnar structure 20 refers to the first auxiliary structure located below the prism structure (on the light-incident surface side), which is a series of parallel columnar strips with preset cross-sectional shapes.

[0030] The first preset angle refers to the angle between the first columnar structure and the extension direction of the first layer, not parallel to the extension direction of the upper prism structure, but rather maintaining a preset angle with it.

[0031] The overlapping of incident surfaces refers to the structure being in direct contact with or close to the bottom surface of the prism structure (i.e. the side on which the light enters).

[0032] The above solution can eliminate optical interference and moiré fringes. Since the prism structure and the RGB pixels of the liquid crystal glass panel above are arranged periodically, they are prone to producing visible alternating bright and dark fringes (moiré fringes) when placed in parallel. By using a first preset angle to misalign the two periodic structures, the periodic alignment condition of the emitted light that produces moiré fringes is fundamentally destroyed.

[0033] By stacking the first linear extension columnar structure 20 on the side away from the prism structure, the order of the three-layer structure is defined: from top to bottom, it is “linear triangular prism structure 10” → “first linear extension columnar structure 20” → “second linear extension columnar structure 30”, and light enters from the bottom second linear extension columnar structure 30.

[0034] Further suppressing moiré patterns and improving compatibility, even if the first layer fails to completely eliminate interference with the liquid crystal glass above, the second layer intervenes from another angle, forming a double guarantee. This allows the brightness enhancement film to be compatible with more types of backlight source structures, improving product versatility.

[0035] By optimizing the viewing angle characteristics and softening the emitted light, the emitted light from a single prism film is very "hard" and has a narrow viewing angle. After the light is "pre-diffused" and "angle rearranged" by two layers of columnar structures with different angles, the angle distribution of the light emitted from the prism will be smoother and more continuous. While maintaining a high peak brightness, the effective viewing angle is widened, avoiding a sharp drop in brightness at large angles and improving visual comfort.

[0036] The linear triangular prism structure 10, the first linear extended columnar structure 20, and the second linear extended columnar structure 30 are stacked in an orderly manner from top to bottom. The extension direction of the linear triangular prism structure 10 is used as the first reference, and the first linear extended columnar structure 20 and the second linear extended columnar structure 30 are arranged in an orderly manner along a preset rotation direction according to the first preset angle and the second preset angle, respectively, to form two sets of intersecting columnar structure layers.

[0037] It should be noted that the preset rotation direction is clockwise.

[0038] Specifically, the orderly stacking from top to bottom clarifies the physical layers, forming the basis of the manufacturing process. Its preparation methods typically include, but are not limited to, co-extrusion and UV embossing (embossing on different layers in stages). Using the extension direction of the linear triangular prism structure 10 as a reference and along a preset rotation direction, a coordinate system defining angles can be achieved.

[0039] Assuming the prism's prism direction is 0° (e.g., vertical), the first columnar structure is set by rotating clockwise or counterclockwise by an angle (e.g., +30° or -45°); the second layer is set by rotating a second preset angle along the same direction of rotation (e.g., clockwise) based on this reference or the first layer, ensuring the design's clarity and repeatability.

[0040] By forming two sets of intersecting columnar structural layers, "two sets" refers to the first columnar structural layer and the second columnar structural layer. Since their extension directions are different (the included angle is not 0° or 180°), when viewed from the direction perpendicular to the membrane surface, their textures will form a cross grid pattern, which is the most critical appearance and functional feature of the structure.

[0041] The above scheme enables the creation of a two-dimensional light diffusion substrate that provides light transmission capability in both the X and Y directions. However, the light transmission capability in the two directions (determined by the curvature, spacing, and angle of each columnar structure) can be designed independently, which greatly increases the degree of freedom in optical design.

[0042] It can also achieve the "decoupling" and "recombination" of light energy. The light is first conducted and diffused in one direction by the second layer, then conducted and diffused in another direction by the first layer, and finally converged in its specific direction by the prism layer. The whole process upgrades the "one-dimensional convergence" of a single prism to a hybrid mode of "two-dimensional pre-diffusion + one-dimensional main convergence", making the final brightness and viewing angle distribution curves more rounded and full.

[0043] The basic principle of this invention is as follows: like Figure 2 The columnar extension structure shown has a directional light-conducting function, guiding the light source entering from below in the direction of the structure's extension, and as... Figure 4 As shown, when combined with the intersecting second-layer columnar extension structure, the bottom light source will be conducted along the columnar structure due to the effect of refractive index, causing the light to diffuse outward from each intersection point. Therefore, the actual effect is to redistribute the light intensity of the bottom mini-LED point light source through the two sets of columnar extension structures, presenting a uniform light effect without fogging.

[0044] After the light is processed through two layers of columnar structure, it becomes similar to a uniform surface light source. This light source then enters the top prism structure, where the prism layer converges the light output angle to enhance the brightness.

[0045] The overall effect is equivalent to that of multiple light-diffusing films plus a brightness enhancement film in a traditional mini-LED backlight solution. However, since the light-diffusing effect does not originate from diffusion, it results in lower light loss. Furthermore, the light-diffusing and brightness enhancement functions are integrated into a single optical film, thus offering benefits such as thinner design, simplified assembly process, and improved yield.

[0046] This application provides a novel brightness enhancement film architecture that can provide high fogging and light uniformity while improving the optical gain of the film.

[0047] As can be seen from the above description, this application achieves the following technical effects: In this embodiment, two sets of intersecting columnar structure layers are used. The linear triangular prism structure 10, the first linear extended columnar structure 20, and the second linear extended columnar structure 30 are stacked in an orderly manner from top to bottom. Based on the extension direction of the linear triangular prism structure 10, the first linear extended columnar structure 20 and the second linear extended columnar structure 30 are sequentially and orderly arranged along a preset rotation direction according to the first preset angle and the second preset angle, respectively, to form two sets of intersecting columnar structure layers. This achieves the purpose of effectively homogenizing the light from the bottom point light source, thereby realizing the technical effect of improving the optical gain function of the film. This solves the technical problem that existing light homogenizing films are still in the category of diffusion films, and the brightness will decrease when multiple layers are stacked.

[0048] Furthermore, the linear triangular prism structure 10 includes a first substrate layer 101 connected to the upper surface of the first linear extended columnar structure 20, wherein a plurality of linear triangular prisms 102 are arrayed on the upper surface of the first substrate layer 101 to form a linear triangular prism 102 layer.

[0049] Specifically, the first substrate layer 101 is typically a transparent optical film, which can be PET or PC, serving as a mechanical support and optical transition layer, with its lower surface connected to the upper surface of the first linear extended columnar structure 20.

[0050] A series of parallel, micron-sized triangular prisms are fabricated on the surface of a substrate using UV embossing or hot pressing processes, consisting of 102 layers of linear triangular prisms. The apex angle of the prisms is typically around 90°, the height is approximately 15-50 μm, and the base width is approximately 30-100 μm.

[0051] The above solution achieves mechanical stability, with the substrate layer providing the overall film with tensile and bending resistance, preventing the pure prism layer from being brittle and fragile. It also ensures manufacturing feasibility: the first substrate layer 101 can serve as a carrier for the imprinting process, facilitating the use of mature roll-to-roll continuous production and reducing manufacturing costs. At the same time, it enables thickness control; by adjusting the thickness of the substrate layer, the overall stiffness and flexibility of the film can be optimized to meet the assembly requirements of backlight modules of different sizes.

[0052] Furthermore, the first linear extended columnar structure 20 includes: a second substrate layer 201, wherein a plurality of first linear extended columnar prisms 202 are arranged in a spaced array on the upper surface of the second substrate layer 201 to form a first linear extended columnar prism 202 layer.

[0053] Specifically, the first linear extended columnar structure 20 also adopts a laminated structure of substrate + columnar prism layer. The lower surface of the second substrate layer 201 is connected to the second linear extended columnar structure 30, while the upper surface supports the first linear extended columnar prism layer 202.

[0054] Spacing array setup: There are flat gaps between the prisms, which allow some light to pass through without being diffused, thus achieving a balance between diffusion and brightness.

[0055] By adopting the above scheme, directional conduction and diffusion functions can be achieved: the long axis direction of the columnar prism determines the direction of conduction and diffusion; compared with the continuous full-coverage prism structure, the spaced array allows some light to bypass the columnar structure and propagate directly upward, thereby reducing energy loss caused by multiple refractions; at the same time, it reduces manufacturing stress: the intermittently arranged columnar prisms have less thermal stress and shrinkage stress during UV curing, which is beneficial to maintaining the flatness of the film.

[0056] Furthermore, the second linear extended columnar structure 30 includes: a third substrate layer 301, wherein a plurality of second linear extended columnar prisms 302 are arranged in a spaced array on the upper surface of the third substrate layer 301 to form a second linear extended columnar prism 302 layer.

[0057] Specifically, the second linear extended columnar structure 30 is similar to the first layer structure, also consisting of a third substrate layer 301 and a second linear extended columnar prism 302 on its upper surface. The third substrate layer 301 is the bottommost substrate of the entire brightness enhancement film, and a functional coating (such as an anti-adsorption coating) can be further added to its lower surface.

[0058] By adopting the above scheme, secondary optical modulation can be achieved: the second layer of cylindrical prism, with its preset extension direction (second preset angle) and cross-sectional shape, performs the first pre-diffusion of incident light, so that the light has already obtained a wider angular distribution on the horizontal plane before entering the first layer.

[0059] Furthermore, a haze-resistant anti-adsorption coating 40 is provided on the lower surface of the second linear extended columnar structure 30.

[0060] Specifically, the coating is located at the bottom layer of the entire brightness enhancement film (the lower surface of the third substrate layer 301), directly facing the LED below in the backlight module.

[0061] Haze characteristics: The coating surface has a micron-level uneven structure, such as spherical particle protrusions and irregular undulations, giving the surface a matte or frosted effect rather than a smooth mirror finish. In this application, low haze can be used.

[0062] Anti-adhesion function: When smooth optical films are laminated, they can adhere tightly together due to surface tension, electrostatics, or vacuum effects, forming "Newton's rings" or becoming impossible to separate, affecting assembly and optical performance. The uneven structure of the haze coating ensures that there are only point contacts between the films, allowing air to enter the gaps and thus preventing adhesion.

[0063] Furthermore, the numerical range of the first preset included angle is 55°-65°.

[0064] Specifically, the first preset angle refers to the angle between the extension direction of the first linear extended columnar structure 20 and the extension direction of the linear triangular prism structure 10. Taking the prism extension direction as a reference (set to 0°), the first layer of columnar prisms is rotated 55°-65° in a preset rotation direction (e.g., clockwise) before being set.

[0065] Optimal moiré fringe suppression effect: When the angle between the two periodic structures is around 60°, the resulting moiré fringe period is the smallest, the contrast is the lowest, and it is the least noticeable to the human eye.

[0066] Balanced two-dimensional diffusion: The 60° angle allows the first-layer cylindrical prism to produce significant diffusion components in both the X and Y directions, neither too close to parallel (diffusion becomes singular) nor too close to perpendicular (diffusion is too intense, resulting in excessive brightness loss).

[0067] Furthermore, the second preset angle is the angle between the extension direction of the second linear extension columnar structure 30 and the extension direction of the first linear extension columnar structure 20, and the extension direction of the first linear extension columnar structure 20 is taken as the second reference. The numerical range of the second preset angle is 80°-90°. The priority of the first reference is higher than that of the second reference.

[0068] Specifically, the second preset angle refers to the angle between the extension direction of the second linear extension columnar structure 30 and the extension direction of the first linear extension columnar structure 20, and is set after the second layer of columnar prisms is rotated 80°-90° with the extension direction of the first linear extension columnar structure 20 as the second reference (0°).

[0069] It is important to know that the angle between adjacent upper and lower microstructures is based on the extension direction of the upper microstructure.

[0070] Furthermore, the second preset angle is greater than the first preset angle.

[0071] Specifically, the angle between the extension direction of the lower (second layer) columnar prism and the prism direction is greater than the angle between the upper (first layer) columnar prism and the prism direction.

[0072] It can achieve a hierarchical optical control strategy: lower layer (second layer, large included angle ≈80°-90°): "coarse adjustment" - large amplitude, near orthogonal direction of conduction and diffusion, the main function is to homogenize the LED light source below.

[0073] Upper layer (first layer, with an angle of approximately 55°-65°): Performs "fine-tuning"—moderate diffusion to further homogenize the light and guide it into the prism layer at the appropriate angle.

[0074] Top layer (prism layer): "Focusing" – concentrating light in the direction of direct view to increase brightness; adopting a three-stage optical path of "coarse adjustment → fine adjustment → focusing", which is more scientific and has higher optical efficiency than simple single diffusion or single convergence.

[0075] To avoid functional duplication: If the second included angle is smaller than the first included angle, the diffusion directions of the lower and upper layers will be too close, resulting in functional overlap, waste, and potential unnecessary interference. Ensure the second included angle is larger than the first included angle, so that the diffusion directions of the two layers have sufficient resolution, allowing each to play its unique role.

[0076] Optimizing viewing angle symmetry: The prism layer itself has a strong converging effect (narrow viewing angle) perpendicular to its extension direction, but a weaker converging effect (wide viewing angle) in the parallel direction. By setting the lower layer to a near-vertical (80°-90°) diffusion, the excessively narrow viewing angle in the vertical direction of the prism layer can be compensated for; while the upper layer's medium-angle (55°-65°) diffusion can play a smooth transition between the two directions, ultimately reducing the difference between the horizontal and vertical viewing angles and improving viewing comfort.

[0077] Furthermore, the first substrate layer 101, the second substrate layer 201, and the third substrate layer 301 are one of PET, PC, PMMA, or PS. This allows for a variety of materials to be selected, thereby improving practicality. Preferably, the first substrate layer 101, the second substrate layer 201, and the third substrate layer 301 are PET.

[0078] This application also has the following beneficial effects: 1. Eliminate optical defects, solve the annoying moiré pattern problem, and improve image clarity.

[0079] 2. Optimize viewing angle balance. While maintaining the core brightness enhancement capability, effectively widen the horizontal viewing angle to make the brightness distribution more uniform and softer, and avoid the "tunneling effect".

[0080] 3. Improve light energy utilization efficiency. By reducing interface reflection loss and more accurate optical path pre-calibration, more light from the backlight can be directed to the observer, achieving higher brightness while potentially reducing backlight power consumption.

[0081] The following examples further illustrate this point: In the following embodiments, each layer uses 50µm PET as the substrate, and the bottom surface is a 10% haze anti-stick layer. The included angle between the upper and lower microstructures is based on the extension direction of the upper microstructure, and the lower microstructure must be rotated to the right to the set included angle.

[0082] A mini-LED backlight was used as the result evaluation system. The effects of the assembled optical film on the shading of the light source, the uniformity of the image, and the optical brightness were observed.

[0083] All embodiments must comply with the microstructure setting conditions of this invention: Example 1 The upper microstructure is a linear triangular prism structure 10 (linear triangular prism), the middle microstructure is a first linear extended columnar structure 20 (linear columnar prism), and the lower microstructure is a second linear extended columnar structure 30 (linear columnar prism). The upper microstructure is an isosceles right triangle with a base width of 70 μm, arranged continuously and closely. The middle microstructure is a rectangle with a base width of 5 μm and a height of 7 μm, arranged with a spacing of 5 μm. The lower microstructure is a rectangle with a base width of 5 μm and a height of 7 μm, arranged with a spacing of 5 μm. The angle between the upper and middle linear structures is 60°, and the angle between the middle and lower linear structures is 90°.

[0084] At this point, the test results of the brightness enhancement film are as follows: the light and shadow blocking effect on the LED light source is that the LED light spot is invisible; the screen uniformity is that the brightness is slightly uneven, there are no interference fringes, and the brightness ratio is 107%.

[0085] Example 2 The difference between Example 2 and Example 1 is that the angle between the middle layer and the lower layer linear structure is 80°.

[0086] At this point, the test results of the brightness enhancement film are as follows: the light and shadow blocking effect on the LED light source is that the LED light spot is invisible, the screen uniformity is uniform without interference stripes, and the brightness ratio is 106%.

[0087] Example 3 The difference between Example 3 and Example 1 is that the middle layer microstructure has a bottom width of 3µm and is arranged with a spacing of 3µm, while the lower layer microstructure has a bottom width of 3µm and is arranged with a spacing of 3µm.

[0088] At this point, the test results of the brightness enhancement film are as follows: the light and shadow blocking effect on the LED light source is that the LED light spot is invisible, the screen uniformity is uniform without interference stripes, and the brightness ratio is 110%.

[0089] Example 4 The difference between Example 4 and Example 1 is that the middle layer microstructure has a bottom width of 3µm and is arranged with a spacing of 3µm, the lower layer microstructure has a bottom width of 3µm and is arranged with a spacing of 3µm, and the angle between the middle and lower layer linear structures is 80°.

[0090] At this point, the test results of the brightness enhancement film are as follows: the light and shadow blocking effect on the LED light source is that the LED light spot is invisible, the screen uniformity is uniform without interference stripes, and the brightness ratio is 110%.

[0091] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that only a single isosceles right-angle prism brightening film with a bottom width of 70 μm is used, and the bottom side has a 10% haze anti-sticking layer.

[0092] At this point, the test results of the brightness enhancement film are as follows: the light and shadow blocking effect on the LED light source is that the LED light spot is clearly visible, the screen uniformity is uniform without interference stripes, and the brightness ratio is 100%.

[0093] The results of each embodiment and comparative example are shown in Table 1: Table 1 The test results above show that: As can be seen from Examples 1-4 and Comparative Example 1, the novel structure proposed in this application can provide sufficient point light source diffusion effect, making the lower LED light points invisible in the image. Furthermore, it presents a uniform light effect without fogging, resulting in better optical efficiency for the backlight system. Additionally, when none of the three layers are set to be orthogonal, the uniformity of the image and the anti-interference effect are better.

[0094] This application also relates to a display device including the aforementioned brightness enhancement film.

[0095] 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 brightness enhancement film, characterized in that, include: Linear triangular prism structure (10); A first linear extended columnar structure (20) is superimposed on the light-incident surface of the linear triangular prism structure (10) at a first preset angle; and A second linear extension columnar structure (30) is stacked with the first linear extension columnar structure (20) on the side away from the linear triangular prism structure (10) at a second preset angle; The linear triangular prism structure (10), the first linear extended columnar structure (20), and the second linear extended columnar structure (30) are stacked in an orderly manner from top to bottom. The extension direction of the linear triangular prism structure (10) is used as the first reference, and the first linear extended columnar structure (20) and the second linear extended columnar structure (30) are arranged in an orderly manner along the preset rotation direction according to the first preset angle and the second preset angle, respectively, to form two sets of intersecting columnar structure layers.

2. The brightening film according to claim 1, characterized in that, The linear triangular prism structure (10) includes a first substrate layer (101) connected to the upper surface of the first linear extended columnar structure (20), wherein a plurality of linear triangular prisms (102) are arrayed on the upper surface of the first substrate layer (101) to form a linear triangular prism (102) layer.

3. The brightening film according to claim 1, characterized in that, The first linear extended columnar structure (20) includes: a second substrate layer (201), wherein a plurality of first linear extended columnar prisms (202) are arranged in a spaced array on the upper surface of the second substrate layer (201) to form a first linear extended columnar prism (202) layer.

4. The brightening film according to claim 1, characterized in that, The second linear extended columnar structure (30) includes: a third substrate layer (301), wherein a plurality of second linear extended columnar prisms (302) are arranged in a spaced array on the upper surface of the third substrate layer (301) to form a second linear extended columnar prism (302) layer.

5. The brightening film according to claim 1, characterized in that, The lower surface of the second linear extended columnar structure (30) is provided with a haze anti-adsorption coating (40).

6. The brightening film according to claim 1, characterized in that, The first preset included angle has a numerical range of 55°-65°.

7. The brightening film according to claim 1, characterized in that, The second preset angle is the angle between the extension direction of the second linear extension columnar structure (30) and the extension direction of the first linear extension columnar structure (20), and the extension direction of the first linear extension columnar structure (20) is taken as the second reference. The numerical range of the second preset angle is 80°-90°. The priority of the first reference is higher than that of the second reference.

8. The brightening film according to claim 1, characterized in that, The second preset angle is greater than the first preset angle.

9. The brightening film according to claim 2, characterized in that, The first substrate layer (101), the second substrate layer (201) and the third substrate layer (301) are one of PET, PC, PMMA or PS.

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

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