Micro-lens optical film, backlight module and display device

Abstract

The invention discloses a micro-lens optical film, a backlight module and a display device, and relates to the technical field of display. The composite microstructure comprises a plurality of micro lenses which are arranged in an array at intervals along a preset direction; the plurality of prisms are respectively and tightly arranged between the plurality of adjacent micro lenses; wherein a plurality of prisms are respectively guided between the adjacent microlens arrays, so as to form a composite microstructure. The problems that the optical function of an existing micro-lens film is obviously lower than that of a prism structure, so that the optical benefit of a single micro-lens film is lower than that of a single prism film, and the optical benefit of attachment of the micro-lens film and prismatic lenses is lower than that of attachment of the prismatic lenses are solved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a microlens optical film, a backlight module and a display device. Background Art

[0002] Microlens film is widely used in the LCD industry. It can present its optical function as a single microlens film or laminated MOP (microlens on prism) film.

[0003] However, the optical function of the existing microlens film is significantly lower than that of the prism structure, resulting in the optical benefit of a single microlens film being lower than that of a single prism sheet, and the optical benefit of a microlens film and a prism sheet laminated together (MOP) being lower than that of a prism sheet laminated together (POP). Currently, no effective solution has been proposed to the above problems. Summary of the invention

[0004] Purpose of the invention: To provide a microlens optical film, a backlight module and a display device to solve the above problems existing in the prior art.

[0005] Technical solution: A microlens optical film, comprising: A plurality of micro lenses are arranged in an array at intervals along a preset direction; and A plurality of prisms are closely disposed between adjacent microlenses; Wherein, a plurality of prisms are respectively introduced between adjacent microlenses to form a composite microstructure.

[0006] Preferably, the coverage area of ​​the plurality of microlenses accounts for no less than 50% of the total area of ​​the optical composite microstructure.

[0007] Preferably, the microlenses are arranged in a regular and orderly manner.

[0008] Preferably, the microlenses are randomly distributed.

[0009] Preferably, the cross section of the microlens is a hemispherical or elliptical hemispherical cross section.

[0010] Preferably, the plurality of prisms are arranged in parallel.

[0011] Preferably, the height of the microlens is greater than the height of the prism.

[0012] Preferably, the plurality of microlenses are arranged tangent to each other in pairs, and the centers of the microlenses arranged adjacent to each other in a preset direction, wherein one center and a horizontal extension line of the intersection of the microlenses arranged adjacent to each other in the edge direction of the prism are located at the same horizontal position; or, the plurality of microlenses are arranged tangent to each other in pairs, and the centers of the microlenses arranged adjacent to each other in a preset direction are located at the same horizontal position.

[0013] In order to achieve the above objective, according to another aspect of the present application, a backlight module is also provided.

[0014] The backlight module according to the present application includes the microlens optical film; It also includes: a substrate layer, which is arranged on the light incident surface side of the optical composite microstructure.

[0015] In order to achieve the above objective, according to another aspect of the present application, a display device is also provided.

[0016] The display device according to the present application includes the backlight module.

[0017] Beneficial effect: In the embodiment of the present application, a prism is introduced, and a plurality of prisms are introduced between adjacent microlens arrays to form a composite microstructure, thereby achieving the purpose of improving the optical benefit of the microlens film, thereby achieving the technical effect of maintaining the high shielding and high wear resistance of the microlens film while improving the optical gain function of the film, thereby solving the technical problem that the optical function of the existing microlens film is significantly lower than that of the prism structure, resulting in the optical benefit of a single microlens film being lower than that of a single prism film, and the optical benefit of the microlens film and the prism sheet being bonded together is also lower than that of the prism sheet being bonded together. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the planar structure of the microlens optical film of the present invention; and Figure 2 It is a highly schematic diagram of the microlens optical film of the present invention.

[0019] The accompanying drawings are marked as follows: 10. Microlens; 20. Prism; 30. Base material layer. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] like Figure 1-2As shown, the present application relates to a microlens optical film, a backlight module and a display device. The microlens optical film includes: a plurality of microlenses 10, which are arranged in an array along a preset direction; the microlens 10 is a small optical element, usually used to focus light or modulate light on a micro scale, and the diameter is usually between a few microns and tens of microns, so it is called a "micro" lens; at the same time, the film obtained by covering the microlenses 10 has the characteristics of high shielding, good light diffusion function, and certain light collection efficiency, so it is used in the backlight module of the liquid crystal display to provide optical gain and optimize the uniformity of the picture; and the microstructure has a dome, which can provide excellent wear resistance. Among them, the microlenses can be arranged regularly in a chessboard or honeycomb shape, and the fixed direction axis presented by the regular arrangement can be parallel to the X-axis or Y-axis or any direction of the display picture. Or the microlenses can also be designed to be randomly and irregularly distributed.

[0025] A plurality of prisms 20 are closely arranged between adjacent microlenses 10; the prisms 20 can be conventional isosceles prism structures in the field of optical films, and can be used for various optical applications such as light splitting, focusing, and beam splitting; at the same time, these prisms 20 can be arranged into various geometric distributions to achieve different optical functions.

[0026] Preferably, the shape of the prism 20 includes but is not limited to: an isosceles right-angle prism; the isosceles right-angle prism 20 can be used for light dispersion and deflection, and can also be used in a spectrometer or other optical instruments.

[0027] A plurality of prisms 20 are distributed between adjacent micro-lenses 10 , and the incorporated prisms 20 are used to enhance the optical benefit of the optical film composed of the micro-lenses 10 .

[0028] A plurality of prisms 20 are introduced between adjacent microlenses 10 to form a composite microstructure. By introducing another set of parallel prisms 20 between adjacent microlenses 10, the optical efficiency can be effectively improved while maintaining the uniform light and shielding properties of the film.

[0029] The composite microstructure of the microlens 10 and the prism 20 of the present application can be made into a single optical film to replace the optical film composed of the microlens 10, or can be laminated with a prism sheet to form a laminated film to replace the MOP optical film.

[0030] The present application is an optical film with a composite microstructure, which can further enhance the brightening effect of the microlens film.

[0031] From the above description, it can be seen that the present application achieves the following technical effects: In the embodiment of the present application, the prism 20 is introduced, and a plurality of prisms 20 are respectively introduced between the adjacent arrays of microlenses 10 to form a composite microstructure, thereby achieving the purpose of improving the optical benefit of the optical film composed of the microlenses 10, thereby achieving the technical effect of maintaining the high shielding and high wear resistance of the microlens film composed of the microlens 10 while improving the optical gain function of the film, thereby solving the technical problem that the optical function of the existing microlens film is significantly lower than that of the prism structure optical film, resulting in the optical benefit of a single microlens film being lower than that of a single prism film, and the optical benefit of the composite film (MOP) formed by the microlens film and the prism sheet being bonded is also lower than the optical benefit of the composite film (POP) formed by the prism sheet and the prism sheet being bonded.

[0032] Furthermore, the coverage area of ​​the plurality of microlenses 10 accounts for no less than 50% of the total area of ​​the optical composite microstructure. It can be understood that this ensures that the optical film still has good light homogenization and shielding capabilities.

[0033] Furthermore, the microlenses 10 are arranged in a regular and orderly manner. It is understood that by adopting a regular and orderly arrangement structure, the consistency of optical properties can be ensured and local optical performance non-uniformity can be avoided; at the same time, the manufacturing process is easy to control and the optical effect repeatability and stability of the optical film are improved.

[0034] Furthermore, the micro lenses 10 are randomly distributed. It is understandable that by adopting a randomly distributed structure, interference effects can be reduced, angle cutting can be avoided, and product area utilization can be improved.

[0035] Furthermore, the cross section of the micro lens 10 is a hemispherical or elliptical hemispherical cross section. It is understandable that a variety of shapes can be selected to meet the needs of various usage scenarios and achieve a flexible use effect.

[0036] The hemispherical microlens 10 has a strong focusing ability and is suitable for collimated light applications. For example, a plano-convex lens is used, which is a lens with one side being flat and the other side being convex. The lens can be used to focus or scatter light, depending on whether the light enters from the convex surface or the flat surface. For example, when light enters from the convex surface, the plano-convex lens can focus the light to a focal point, making it often used as a component for converging or focusing light in an optical imaging system.

[0037] Elliptical hemispherical microlens 10: The focal length range can be adjusted, which is suitable for non-uniform light beam adjustment. In particular, the more convex elliptical hemisphere has better light extraction efficiency and can improve the optical film penetration and brightness.

[0038] Furthermore, the plurality of prisms 20 are arranged in parallel, which can ensure that the refraction or transmission direction of the light remains consistent, and at the same time, can reduce light scattering and improve the direction control capability of the overall optical system.

[0039] Furthermore, the height of the microlens 10 is greater than the height of the prism 20. It can be understood that the microlens 10 can ensure that the tip of the prism 20 is protected from being scratched.

[0040] Specifically, the microlens 10 has a height H, and the prism 20 has a height h, wherein H>h, so as to ensure that the microlens 10 structure can be higher than the prism 20 structure, so that the microlens 10 can protect the prism 20 structure, and the sharp corners of the prism 20 are not easily damaged by friction on the surface.

[0041] Of course, the microlenses 10 can be of a single size or have different sizes, but the maximum height is H, satisfying H>h.

[0042] Further, a plurality of the microlenses 10 are arranged tangentially to each other, and the centers of the microlenses 10 arranged adjacently along a preset direction, wherein one center and the horizontal extension line of the intersection of the microlenses 10 arranged adjacently along the edge direction of the prism 20 are located at the same horizontal position; or, a plurality of the microlenses 10 are arranged tangentially to each other, and the centers of the microlenses 10 arranged adjacently along the preset direction are located at the same horizontal position. It can be understood that the uniform refraction of light can be ensured, and the uneven brightness caused by improper geometric arrangement can be reduced, thereby improving the brightness uniformity of the display screen or lighting system.

[0043] By arranging a plurality of microlenses 10 in a tightly embedded manner, placing a microlens 10 tangent to adjacent microlenses 10 , and sequentially arranging them in an array according to this structure, a honeycomb tightly arranged structure is finally formed.

[0044] By arranging a plurality of micro lenses 10 in an orderly adjacent array, that is, in a matrix arrangement, it is possible to obtain a composite optical film in another structural form.

[0045] The present invention also provides a backlight module, comprising the microlens 10 optical film; The optical composite microstructure further comprises a substrate layer 30 , wherein the substrate layer 30 is disposed on a light incident surface side of the optical composite microstructure.

[0046] Specifically, the substrate layer 30 refers to the base material or substrate to which the optical film or coating is attached, which can achieve good fixing and supporting effects; at the same time, it can also cooperate with other film layer structures to achieve multiple functional effects.

[0047] Furthermore, the substrate layer 30 is polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride or polystyrene. It is understandable that by providing a variety of materials to choose from, a flexible selection effect can be achieved, thereby being able to meet a variety of usage requirements.

[0048] The specific examples are further described below: Example 1 The uniform microlens has a diameter of 50um and a height of 15um, and is arranged in three rows of densest packing; the prism structure is an isosceles right-angle shape, with a bottom width of 28um and a height of 14um. Figure 1 Arrangement shown.

[0049] At this time, after testing, the performance parameters of the microlens optical film are: abrasion resistance is 3000g, and brightness is 3830nits.

[0050] Example 2 The difference from Example 1 is that Example 1 is used as the upper film, and a lower prism is attached to form a MOP composite film.

[0051] At this time, after testing, the performance parameters of the microlens optical film are: abrasion resistance is 3000g, and brightness is 6166nits.

[0052] Example 3 The difference from Example 1 is that the prism structure has a height h of 10 um.

[0053] At this time, after testing, the performance parameters of the microlens optical film are: abrasion resistance is 3000g, and brightness is 3721nits.

[0054] Comparative Example 1 The difference from Example 1 is that a single microlens film with a diameter of 50 um and a height of 15 um is densely packed and regularly arranged.

[0055] At this time, after testing, the performance parameters of the microlens optical film are: abrasion resistance is 3000g, and brightness is 3591nits.

[0056] Comparative Example 2 The difference from Example 1 is that Comparative Example 1 is used as the upper film and a lower prism is attached thereto.

[0057] At this time, after testing, the performance parameters of the microlens optical film are: abrasion resistance is 3000g, and brightness is 5893nits.

[0058] Comparative Example 3 The difference from Example 1 is that, in the prism structure, the bottom width is 36 um and the height h is 18 um.

[0059] At this time, after testing, the performance parameters of the microlens optical film are: abrasion resistance is 50g, and brightness is 3996nits.

[0060] The results of various embodiments and comparative examples are shown in Table 1: From the above test results we can see that: 1. It can be seen from Example 1 and Comparative Example 1 that the optical structure of the present application effectively improves the optical benefit while maintaining the wear resistance of the diaphragm.

[0061] 2. It can be seen from Example 2 and Comparative Example 2 that the optical composite microstructure of the present application is used as an upper film and a lower prism is bonded to make a MOP product, which significantly improves the optical benefit while maintaining the wear resistance of the film.

[0062] 3. It can be seen from Examples 1 and 3 that as the height of the prism decreases, the brightness decreases, which is consistent with the characteristic that the size of the brightness enhancement film prism affects the brightness.

[0063] 4. It can be seen from Example 1 and Comparative Example 3 that as the height of the prism increases and becomes higher than the height of the microlens, the prism loses its protection, which greatly affects the wear resistance of the optical film.

[0064] The present invention also provides a display device, comprising the backlight module and a display module located at the light-emitting side of the backlight module, wherein the backlight module is used to provide a backlight source for the display module.

[0065] Optionally, the display device may be a liquid crystal display (LCD) display device. The display device may be any appropriate display device, including but not limited to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and an e-book.

[0066] Since the display device can have substantially the same technical effects as the backlight module structure described in the previous embodiment, the technical effects of the backlight module will not be described repeatedly here for the purpose of brevity.

[0067] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A microlens optical film, characterized in that: include: A plurality of micro lenses (10) are arranged in an array at intervals along a preset direction; and A plurality of prisms (20) are respectively and closely arranged between a plurality of adjacent microlenses (10); A plurality of prisms (20) are respectively introduced between adjacent arrays of microlenses (10) to form a composite microstructure.

2. The microlens (10) optical film according to claim 1, characterized in that: The coverage area of ​​the plurality of microlenses (10) accounts for no less than 50% of the total area of ​​the optical composite microstructure.

3. The microlens (10) optical film according to claim 1, characterized in that: The microlenses (10) are arranged in a regular and orderly manner.

4. The microlens (10) optical film according to claim 1, characterized in that: The microlenses (10) are randomly distributed.

5. The microlens (10) optical film according to claim 1, characterized in that: The cross section of the microlens (10) is a hemispherical or elliptical hemispherical cross section.

6. The microlens (10) optical film according to claim 1, characterized in that: A plurality of prisms (20) are arranged in parallel.

7. The microlens (10) optical film according to claim 1, characterized in that: The height of the microlens (10) is greater than the height of the prism (20).

8. The microlens (10) optical film according to claim 1, characterized in that: A plurality of the microlenses (10) are arranged tangentially to each other in pairs, and the centers of the microlenses (10) arranged adjacently in a preset direction, wherein one center of the circle and a horizontal extension line of a junction of the microlenses (10) arranged adjacently in the direction of the edge of the prism (20) are located at the same horizontal position; or, a plurality of the microlenses (10) are arranged tangentially to each other in pairs, and the centers of the microlenses (10) arranged adjacently in a preset direction are located at the same horizontal position.

9. A backlight module, characterized in that: An optical film comprising a microlens (10) as claimed in any one of claims 1 to 8; It also comprises: a substrate layer (30), wherein the substrate layer (30) is arranged on the light incident surface side of the optical composite microstructure.

10. A display device, characterized in that Comprising the backlight module as claimed in claim 9.

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