Prism structure, brightness enhancement film and its application to pop type attached brightness enhancement film

Abstract

This utility model discloses a prism structure, a brightness enhancement film, and its application in POP-type laminated brightness enhancement films, relating to the field of optical film technology. The prism structure includes: a plurality of first prisms arranged in an adjacent array along a first direction; and a plurality of second prisms arranged in a spaced array along a second direction, interleaving with the first prisms at a predetermined angle; wherein the height of the second prisms is greater than the height of the first prisms, the cross-section of the first prisms is an isosceles right triangle, the cross-section of the second prisms is an isosceles triangle, and their apex angles are rounded and / or flat-topped; and both the first and second prisms are made of photocurable hard resin with a refractive index range of 1.55-1.7. This utility model solves the problem that traditional brightness enhancement films, while addressing wear resistance and adsorption issues, suffer from slightly inferior anti-interference performance.

Description

Technical Field

[0001] This utility model relates to the field of optical film technology, and in particular to a prism structure, a brightness enhancement film and its application in POP-type bonding brightness enhancement film. Background Technology

[0002] Currently, brightness enhancement film (BEF) is commonly used in backlight modules to focus the light emitted by a light source. Especially in display devices such as monitors, brightness enhancement films are frequently used to increase display brightness, thereby reducing the monitor's energy consumption. Brightness enhancement films typically consist of a substrate and a focusing prism structure on the substrate, both made of transparent resin. Typically, the prism structure layer comprises multiple identical prism strips used to focus light, arranged parallel to each other in the same direction to form a prism array. The prism array adjusts light emitted outside the observer's field of view through refraction and reflection, bringing it within the observer's field of view, thus improving the utilization rate of the light energy emitted by the light source.

[0003] However, the brightness enhancement film may be scratched to varying degrees during transportation and installation, which can damage the microstructure of the optical film, reduce utilization and yield, and thus increase costs.

[0004] In existing technologies, to protect the microstructure of the brightness enhancement film, a protective film is usually applied to it. This protective film adheres to the prism structure layer of the brightness enhancement film via an adhesive layer, thus protecting the prism structure layer. However, this method carries the risk of residual adhesive after the protective film is peeled off, as well as other aesthetic defects, and also increases costs. This method can only prevent damage to the surface microstructure of the optical film during transportation, but it cannot protect the microstructure of the optical film during the backlight module assembly stage and the transportation stage of the finished display. Alternatively, a resilient self-healing resin can be used as a UV resin coating for the microstructure layer to improve the scratch resistance of the brightness enhancement film. However, currently, the refractive index of resins with excellent high resilience and scratch resistance usually does not exceed 1.56, thus limiting the brightness of the brightness enhancement film.

[0005] On the other hand, methods to improve the scratch resistance of brightness enhancement films through microstructure design have been proposed, such as a fully rounded prism structure or a structure with a high number of rounded prisms and a low number of sharp prisms. The former results in lower brightness due to the destruction of prism sharp corners, and the excessive number of rounded corners can easily lead to inter-film adsorption problems. While the latter retains some prism tips, providing a guarantee of brightness, it has a long mold processing time, and the alignment of large and small prisms can easily cause optical interference problems. Currently, no effective solution has been proposed to address these problems. Utility Model Content

[0006] The purpose of this utility model is to provide a prism structure, a brightness enhancement film, and its application in POP-type bonding brightness enhancement film, so as to at least solve one of the problems existing in the prior art.

[0007] Technical solution: A prism structure, comprising:

[0008] A plurality of first prisms are arranged in an array adjacent to each other along a first direction; and

[0009] A plurality of second prisms are arranged in an array at intervals along a second direction, and are staggered with the first prisms at a preset angle;

[0010] Wherein, the height of some of the second prisms is higher than the height of some of the first prisms, the cross-section of the first prism is an isosceles right triangle, the cross-section of the second prism is an isosceles triangle, and its apex is set as a rounded corner and / or a flat top structure; and, the first prism and the second prism are both photocurable hard resins with a refractive index range of 1.55-1.7.

[0011] Preferably, the angle α between the first extension axis of the first prism and the second extension axis of the second prism is 10°-170°.

[0012] Preferably, the first prism has a pre-set jitter height along its height direction in its extension direction;

[0013] The dithering height of the first prism includes: the highest dithering height is h and the lowest dithering height is h';

[0014] Among them, the highest height h is greater than the lowest height h', and the lowest height h' is greater than 0.

[0015] Preferably, the height h of the first prism is 5-40 μm.

[0016] Preferably, the height H of the second prism is greater than the height h of the first prism, and H ≥ h + 0.5 μm.

[0017] Preferably, when the apex of the second prism is rounded, the center of its arc is located on the perpendicular line of the second prism, and its rounded radius r is 0.25-10 μm.

[0018] Preferably, when the apex of the second prism is a flat-top structure, its apex width W is 0.5-10 μm.

[0019] Preferably, the distance between adjacent second prisms is d, and d = h - 25h.

[0020] To achieve the above objectives, according to another aspect of this application, a brightness enhancement film is also provided.

[0021] The brightness enhancement film according to this application includes the aforementioned prism structure;

[0022] It also includes: the first prism and the second prism are staggered at a preset angle to form a transparent structural layer; and

[0023] The transparent structural layer has a substrate layer on the bottom side of the prism structural layer.

[0024] Preferably, the substrate layer is any one of PET, PC or PMMA.

[0025] Beneficial effects: In this embodiment, an optimized microprism structure is adopted, in which the height of several second prisms is higher than the height of several first prisms, the cross-section of the first prism is an isosceles right triangle, the cross-section of the second prism is an isosceles triangle, and its apex is set as a rounded corner and / or a flat top structure; and, both the first prism and the second prism are photocurable hard resins with a refractive index range of 1.55-1.7, achieving the purpose of high brightness, excellent scratch resistance and reduced image interference risk, thereby realizing the technical effect of simplifying the optical film structure and improving the optical efficiency of the film, and thus solving the technical problem that traditional brightness enhancement films, although able to solve the problems of wear resistance and adsorption, have slightly poor anti-interference effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the prism structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the first prism of this utility model;

[0028] Figure 3 This is a cross-sectional schematic diagram of the first prism structure of this utility model;

[0029] Figure 4 This is a schematic diagram of the second prism of this utility model;

[0030] Figure 5 This is a cross-sectional schematic diagram of the second prism structure of this utility model;

[0031] Figure 6 This is a cross-sectional schematic diagram of another second prism structure of this utility model; and

[0032] Figure 7 This is a schematic diagram of the first prism shaking structure of this utility model.

[0033] The attached figures are labeled as follows:

[0034] 1. First prism; 1'. First extension axis;

[0035] 2. Second prism; 2' Second extension axis;

[0036] 3. Substrate layer. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] like Figure 1-7 As shown, this application relates to a prism structure, a brightness enhancement film, and its application in a POP-type laminated brightness enhancement film. The prism structure includes: a plurality of first prisms 1, arranged in an array adjacent to each other along a first direction; the first prisms 1 are the main optical elements, sequentially arranged adjacent to each other on a substrate layer 3 along a specific direction (the first direction); wherein, the first direction can be the X-axis direction or the Y-axis direction of the substrate layer 3.

[0042] A plurality of second prisms 2 are arranged in a spaced array along a second direction and are staggered with the first prism 1 at a preset angle. To compensate for the loss of brightness, the first prism 1 is introduced into the first prism 1 at a preset angle. The second prism 2 is another main optical element, which is obliquely arranged on the upper surface of the substrate layer 3 along the second direction and introduced into the first prism 1 respectively, thus forming a cross-shaped distribution. Therefore, the complete light-gathering function is dually manifested by the first prism 1 and the second prism 2, thereby improving the brightness of the rounded corner wear-resistant brightening film. The second direction can be the X-axis direction or the Y-axis direction of the substrate layer 3, or any angle direction that intersects with the first direction; the first direction is perpendicular to the second direction.

[0043] Prism structures are conventional prism structures in the field of optical films, and can be used for various optical applications such as beam splitting, focusing, and beam splitting. At the same time, these prisms can be arranged into various different geometric shapes to achieve different optical functions.

[0044] It should be noted that the first prism 1 and the second prism 2 are formed by methods including but not limited to sputtering, evaporation, spraying, coating or mold pressing to obtain the desired compound prism structure.

[0045] Wherein, the height of some of the second prisms 2 is higher than the height of some of the first prisms 1, the cross-section of the first prism 1 is an isosceles right triangle, the cross-section of the second prism 2 is an isosceles triangle, and its apex is set as a rounded corner and / or a flat top structure; and, the first prism 1 and the second prism 2 are both photocurable hard resins with a refractive index range of 1.55-1.7.

[0046] Specifically, by making the height of the second prism 2 higher than that of a plurality of the first prisms 1, and by making the cross-section of the first prism 1 an isosceles right triangle, the lost brightness can be compensated, thereby achieving the effect of improving luminance; at the same time, by setting the apex of the second prism 2 to a rounded corner and / or flat top structure, the apex of the first prism 1 can be protected, and the scratch resistance can also be improved.

[0047] Due to the difference in structural height, the second prism 2 protects the first prism 1, allowing the product to select a hard photocurable resin with a higher refractive index (1.55-1.7). This selection of a photocurable hard resin with a higher refractive index can improve the brightness of the brightening film while also ensuring scratch resistance.

[0048] By using isosceles right triangles, good structural stability can be ensured; at the same time, it can also achieve the optical effect of improving brightness, thus possessing good optical performance.

[0049] The novel structure of the brightness enhancement film in this application can improve the scratch resistance of the brightness enhancement film while ensuring high brightness, and at the same time reduce the risk of image interference.

[0050] As can be seen from the above description, this application achieves the following technical effects:

[0051] In this embodiment, an optimized microprism structure is adopted, wherein the height of several second prisms 2 is higher than the height of several first prisms 1. The cross-section of the first prism 1 is an isosceles right triangle, and the cross-section of the second prism 2 is an isosceles triangle, with its apex set as rounded corners and / or flat-top structure. Furthermore, both the first prism 1 and the second prism 2 are photocurable hard resins with a refractive index range of 1.55-1.7, achieving the goals of high brightness, excellent scratch resistance, and reduced image interference risk. This achieves the technical effect of simplifying the optical film structure and improving the optical efficiency of the film, thereby solving the technical problem that traditional brightness enhancement films, although able to solve wear resistance and adsorption problems, have slightly poor anti-interference effect.

[0052] Furthermore, the angle α between the extension directions of the first extension axis 1' of the first prism 1 and the second extension axis 2' of the second prism 2 is 10°-170°. It can be understood that by setting the angle α between the extension directions of the first prism 1 and the second prism 2 in the range of 10°-170°, the prism structure can be ensured to have good optical performance, thereby avoiding poor performance caused by the angle being too large or too small.

[0053] By extending along the first extension axis 1' and the second extension axis 2' respectively, and making the extension directions of the two extension axes different, an angle is formed between the first extension axis 1' and the second extension axis 2'; at the same time, by adopting the form of an interlaced prism microstructure, it can have both high brightness and good scratch resistance; thus, it has good optical performance.

[0054] It should be noted that 1' is also the direction of the extension of the apex of the first prism, 2' is also the direction of the extension of the apex of the second prism, and a is the angle between 1' and 2'.

[0055] like Figure 7 As shown, the first prism 1 has a pre-set jitter height along its height direction in its extension direction;

[0056] The shaking height of the first prism 1 includes: the highest shaking height is h and the lowest shaking height is h';

[0057] The highest height h is greater than the lowest height h', and the lowest height h' is greater than 0. It can be understood that by pre-setting a jitter height in the height direction of the first prism 1, so that the top height of the first prism 1 is not uniform, the first prism 1 can have the effect of jittering up and down along the height direction, thereby effectively causing the prism bottom width to vary, weakening the regularity of the microstructure, and reducing the image interference caused by the fixed bottom width.

[0058] Furthermore, the height h of the first prism 1 is 5-40 μm. It can be understood that by setting the height range of the first prism 1 to 5-40 μm, a variety of sizes can be selected to meet diverse usage needs; at the same time, setting the height of the first prism 1 within the above range ensures that the first prism 1 has good optical performance.

[0059] Furthermore, the height H of the second prism 2 is greater than the height h of the first prism 1, and H ≥ h + 0.5 μm. This ensures good protection for the first prism 1, thereby achieving good optical performance.

[0060] like Figure 4-5 As shown, when the apex of the second prism 2 is rounded, the center of its arc lies on the perpendicular line of the second prism 2, and its rounded radius r is 0.25-10µm. It can be understood that setting the rounded radius r to 0.25-10µm allows for a variety of sizes to be selected, thus meeting diverse usage requirements.

[0061] It is important to know that if the radius r at the tip of the second prism 2 is too small, it will not provide sufficient scratch resistance. If the radius r at the tip of the second prism 2 is too large, interfilm adsorption will occur due to the excessive contact area. Therefore, setting the radius of the fillet within the above-mentioned range can ensure good optical performance.

[0062] like Figure 6 As shown, when the apex of the second prism 2 is a flat-top structure, its apex width W is 0.5-10µm. It can be understood that setting the apex width W to 0.5-10µm allows for a variety of sizes to be selected, thus meeting diverse usage requirements.

[0063] It is important to know that if the width W of the flat top of the tip of the second prism 2 is too small, it will not provide sufficient scratch resistance. If it is too large, the contact area will be too large, resulting in inter-film adsorption. At the same time, obvious stripes will appear on the image. Therefore, setting the W value within the above range can ensure good optical performance.

[0064] Furthermore, the distance between adjacent second prisms 2 is d, and d = h - 25h. It can be understood that by setting the distance between two adjacent second prisms 2 to d = h - 25h, good brightness effect can be ensured; at the same time, the situation where the protective effect is reduced and the scratch resistance is decreased due to excessive distance can be avoided.

[0065] This application also relates to a brightness enhancement film, including the aforementioned prism structure;

[0066] It also includes: the first prism 1 and the second prism 2 are arranged alternately at a preset angle to form a transparent structural layer; and

[0067] The transparent structural layer has a substrate layer 3 on the bottom side of the prism structural layer.

[0068] Specifically, substrate layer 3; the substrate layer refers to the base material or substrate on which the optical film or coating is attached, which can achieve good fixation and support effects; at the same time, it can also cooperate with other film layer structures to achieve multiple functional effects.

[0069] By setting the first prism 1 and the second prism 2 alternately on the substrate layer 3 at a preset angle, a single brightening film with a stable structure can be formed, which also has high brightness and scratch resistance.

[0070] Furthermore, the substrate layer 3 is any one of PET, PC, or PMMA. It is understood that this allows for the selection of multiple materials, thus enabling easily achievable results.

[0071] Of course, the substrate layer can also be PE, PVC or PS.

[0072] This application also relates to a brightness enhancement film for POP-type lamination, including the brightness enhancement film as described above.

[0073] The scratch-resistant double-interlaced prism structure of this invention can be applied not only to single-sheet brightening films but also to POP-type laminated brightening films, serving as an upper prism structure to improve the surface scratch resistance of POP products.

[0074] This application also relates to a display device, including the brightness enhancement film as described above.

[0075] 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 prism structure, characterized in that, include: A plurality of first prisms (1) are arranged in an array adjacent to each other along a first direction; and A plurality of second prisms (2) are arranged in a spaced array along the second direction and are staggered with the first prism (1) at a preset angle; Among them, the height of some of the second prisms (2) is higher than the height of some of the first prisms (1), the cross-section of the first prism (1) is an isosceles right triangle, the cross-section of the second prism (2) is an isosceles triangle, and its apex is set as a rounded corner and / or a flat top structure; and the first prism (1) and the second prism (2) are both light-cured hard resins with a refractive index range of 1.55-1.

7.

2. The prism structure according to claim 1, characterized in that, The angle α between the extension direction of the first extension axis (1') of the first prism (1) and the extension direction of the second extension axis (2') of the second prism (2) is 10°-170°.

3. The prism structure according to claim 1, characterized in that, The first prism (1) has a pre-set jitter height along its height direction in its extension direction; The shaking height of the first prism (1) includes: the highest shaking height is h and the lowest shaking height is h'; Among them, the highest height h is greater than the lowest height h', and the lowest height h' is greater than 0.

4. The prism structure according to claim 1, characterized in that, The height h of the first prism (1) is 5-40 μm.

5. The prism structure according to claim 4, characterized in that, The height H of the second prism (2) is greater than the height h of the first prism (1), and H ≥ h + 0.5 μm.

6. The prism structure according to claim 1, characterized in that, When the apex of the second prism (2) is rounded, the center of its arc is located on the perpendicular line of the second prism (2), and its rounded radius r is 0.25-10um.

7. The prism structure according to claim 1, characterized in that, When the apex of the second prism (2) is a flat-top structure, its apex width W is 0.5-10um.

8. The prism structure according to claim 4, characterized in that, The distance between adjacent second prisms (2) is d, and d = h - 25h.

9. A brightness enhancement film, characterized in that, Includes the prism structure as described in any one of claims 1-8; It also includes: the first prism (1) and the second prism (2) are arranged alternately at a preset angle to form a transparent structural layer; and The transparent structural layer has a substrate layer (3) on the bottom side of the prism structural layer.

10. The brightening film according to claim 9, characterized in that, The substrate layer (3) is any one of PET, PC or PMMA.

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