Composite microstructure, composite optical film and backlight module
By adopting a composite microstructure in the backlight module of the liquid crystal display, and using the combination of the prism layer and the planoconvex lens to form an optical lens unit, the problem of poor light collection effect in the prior art is solved, and the luminance gain of the front viewing angle is improved.
Patent Information
- Application Number
- CN202420384366.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The existing prism optical film structure has limited room for lifting, and the light collection effect is poor, resulting in poor brightness gain of the front viewing angle and lack of effective solutions.
Using a composite microstructure, including a prism layer and a planoconvex lens, an optical lens unit is formed by abutting or connecting the convex surface of the planoconvex lens with the edge of the prism layer, and an adhesive layer is provided on adjacent contact surfaces to optimize the optical film structure to improve light. Closing effect.
It achieves a better light collection effect, improves the brightness gain of the front viewing angle, and solves the problems of limited structural space of traditional prism optical films and poor light collection effect.
Smart Images
Figure CN222145267U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of display technology, in particular to a composite microstructure, a composite optical film and a backlight module. Background Art
[0002] Brightness enhancement film is one of the most important optical films widely used in the backlight module of liquid crystal displays. Its main function is to concentrate light emitted from all directions of the light source to the front, thereby improving light utilization, reducing light loss, and achieving the purpose of increasing backlight brightness or reducing power consumption.
[0003] The existing prism optical films have basically similar structures, limited room for improvement, and poor light gathering effect, resulting in poor brightness gain at normal viewing angles. Currently, no effective solutions have been proposed for the above problems. Utility Model Content
[0004] Purpose of the utility model: to provide a composite microstructure, a composite optical film and a backlight module to solve the above problems existing in the prior art.
[0005] Technical solution: A composite microstructure, comprising: a prism layer; and a plano-convex lens connected to the prism layer; wherein the convex surface of the plano-convex lens is arranged to abut against the edge of the prism layer to form an optical lens unit.
[0006] Preferably, the convex vertex of a plano-convex lens is connected to the edge of a prism layer to form an optical lens unit.
[0007] Preferably, at least one of the adjacent contact surfaces of the prism layer and the plano-convex lens is provided with an adhesive layer.
[0008] Preferably, an adhesive layer is provided between an edge of the prism layer and a convex vertex of the plano-convex lens.
[0009] In order to achieve the above objective, according to another aspect of the present application, a composite optical film is also provided.
[0010] The composite optical film according to the present application comprises the composite microstructure as described above;
[0011] It also includes: a prism layer and a plano-convex lens form a first microstructure layer, a first substrate layer is arranged at the bottom of the first microstructure layer close to the prism layer, a second substrate layer is arranged at the top of the first microstructure layer close to the plano-convex lens, and a second microstructure layer is arranged at the side of the second substrate layer away from the first microstructure layer.
[0012] Preferably, a back coating layer is disposed on a side of the first substrate layer away from the first microstructure layer.
[0013] Preferably, the first substrate layer and the second substrate layer are polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride or polystyrene.
[0014] Preferably, a plurality of the prism layers are sequentially arranged in an array along a preset direction on the first substrate layer, and a plurality of the plano-convex lenses are sequentially arranged in an array at the edges of the plurality of the prism layers;
[0015] Among them, several plano-convex lenses are arranged tangentially in pairs, and the centers of the plano-convex lenses arranged adjacently in the horizontal direction, and the horizontal extension line of the intersection of a center and the plano-convex lenses arranged adjacently in the edge direction of the prism layer are located at the same horizontal position to form a minimum array unit.
[0016] Preferably, a plurality of the prism layers are sequentially arranged in an array along a preset direction on the first substrate layer, and a plurality of the plano-convex lenses are sequentially arranged in an array at the edges of the plurality of the prism layers;
[0017] Among them, the plurality of plano-convex lenses are arranged tangentially to each other, and the centers of the plano-convex lenses adjacently arranged in the horizontal direction are located at the same horizontal position.
[0018] In order to achieve the above objective, according to another aspect of the present application, a backlight module is also provided.
[0019] The backlight module according to the present application includes the composite optical film as described above.
[0020] Beneficial effect: In the embodiment of the present application, an optimized microstructure is adopted, through a prism layer; and a plano-convex lens, connected to the prism layer; wherein the convex surface of the plano-convex lens is arranged to abut against the edge of the prism layer to form an optical lens unit, so as to achieve the purpose of gathering light, thereby realizing the technical effect of improving the brightness gain at the positive viewing angle, and further solving the technical problems that the existing prism optical film structure is basically similar, the improvement space is limited, and the light gathering effect is poor, resulting in poor brightness gain at the positive viewing angle. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the composite microstructure of the utility model;
[0022] Figure 2 It is another schematic diagram of the composite microstructure of the utility model;
[0023] Figure 3 This is a simulation diagram of the optical effect of the existing prism structure;
[0024] Figure 4 This is a simulation diagram of the optical lens unit effect of the utility model;
[0025] Figure 5 This is a schematic diagram of the planar structure of the composite optical film of the utility model;
[0026] Figure 6 is a structural schematic diagram of the first microstructure layer of the utility model; and
[0027] Figure 7 This is another structural schematic diagram of the first microstructure layer of the utility model.
[0028] The reference numerals in the drawings are: 11, first substrate layer; 21, first microstructure layer; 211, prism layer; 2111, prism edge; 212, plano-convex lens; 12, second substrate layer; 22, second microstructure layer; 30, back coating layer; 40, adhesive layer. DETAILED DESCRIPTION
[0029] 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.
[0030] 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.
[0031] 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 this utility model can be understood according to specific circumstances.
[0032] 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.
[0033] like Figure 1-2 As shown, the present application relates to a composite microstructure, a composite optical film and a backlight module. The composite microstructure includes: a prism layer 211; the prism layer 211 can be a conventional prism structure in the field of optical films, which can be used for various optical applications such as light splitting, focusing, and beam splitting; at the same time, these prisms can be arranged into various geometric shapes to achieve different optical functions.
[0034] Preferably, the shape of the prism layer 211 includes but is not limited to: an isosceles prism, a microlens, and a diffusion layer; the isosceles prism can be used for light dispersion and deflection, and can also be used in a beam splitter or other optical instruments;
[0035] A microlens is a small optical component that is usually used to focus or modulate light on a tiny scale. Its diameter is usually between a few microns and tens of microns, so it is called a "micro" lens.
[0036] A plano-convex lens 212 is connected to the prism layer 211; the plano-convex lens 212 is a lens having one flat surface and the other convex surface. 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 212 can focus the light to a focal point, so that it is often used as an element for converging or focusing light in optical imaging systems. In the present application, this structural feature is used. For another example: when light enters from one side of the plane, the plano-convex lens 212 can also be used as a diffuser. At this time, the light will be reflected and refracted on the surface of one side of the plane, causing the light to scatter and spread over a larger range.
[0037] By connecting a plano-convex lens 212 with a prism layer 211, a composite optical system can be formed, wherein the functions of the lens and the prism are combined to achieve a more complex optical effect, wherein the lens can focus the light to a specific focus, and the prism can deflect the light in a specific direction. Therefore, the effects of focusing and deflecting the light can be achieved at the same time.
[0038] It should be noted that by adjusting the relative position or angle of the lens and the prism, the performance of the optical system can be fine-tuned, for example, adjusting the focal length of the imaging system or changing the propagation direction of the light beam.
[0039] The way of connecting the plano-convex lens 212 to the prism layer 211 includes but is not limited to: through optical glue or transparent adhesive; in this configuration, the contact surface between the convex surface of the plano-convex lens 212 and the prism layer 211 needs to be kept flat to ensure that the propagation of light will not be excessively scattered or reflected.
[0040] The convex surface of the plano-convex lens 212 is disposed against the edge 2111 of the prism layer 211 to form an optical lens unit.
[0041] Specifically, the design principle is as follows Figure 3-4 As shown, the convex surface of the plano-convex lens 212 is located at the edge 2111 of the prism layer 211 to form an optical lens unit. Compared with the traditional prism structure, the optical lens unit can better gather light, thereby achieving the effect of positive viewing angle brightness gain.
[0042] The present application is a composite optical film with a microstructure, which can further enhance the brightening effect.
[0043] From the above description, it can be seen that the present application achieves the following technical effects:
[0044] In the embodiment of the present application, an optimized microstructure is adopted, through a prism layer 211; and a plano-convex lens 212, connected to the prism layer 211; wherein the convex surface of the plano-convex lens 212 is set against the edge 2111 of the prism layer 211 to form an optical lens unit, so as to achieve the purpose of gathering light, thereby realizing the technical effect of improving the brightness gain at the positive viewing angle, and further solving the technical problems that the existing prism optical film structure is basically similar, the improvement space is limited, and the light gathering effect is poor, resulting in poor brightness gain at the positive viewing angle.
[0045] Furthermore, the convex vertex of a plano-convex lens 212 is connected to the edge 2111 of a prism layer 211 to form an optical lens unit. It can be understood that the optical lens unit is formed by locating the vertices of the plano-convex lens 212 at the edge 2111 of the prism layer 211. Compared with the traditional prism structure, the optical lens unit can better gather light, thereby achieving the best positive viewing angle brightness gain effect.
[0046] Furthermore, at least one of the adjacent contact surfaces of the prism layer 211 and the plano-convex lens 212 is provided with an adhesive layer 40. It is understandable that by providing the adhesive layer 40 on the edge 2111 of the prism layer 211 or on the convex side of the plano-convex lens 212, that is, at the junction of the prism layer 211 and the plano-convex lens 212, a good connection effect of the prism layer 211 and the plano-convex lens 212 can be achieved. Of course, the adhesive layer 40 can be provided on the edge 2111 of the prism layer 211 and on the convex surface of the plano-convex lens 212 at the same time, which can ensure a good connection effect.
[0047] Furthermore, an adhesive layer 40 is provided between the edge 2111 of the prism layer 211 and the convex vertex of the plano-convex lens 212. It is understandable that by providing the adhesive layer 40 between the edge 2111 of the prism layer 211 and the convex vertex of the plano-convex lens 212, the prism layer 211 and the plano-convex lens 212 can be well fixed and connected, thereby obtaining a stable optical structure.
[0048] like Figure 5 As shown, the utility model also provides a composite optical film, comprising the composite microstructure described above;
[0049] It also includes: a prism layer 211 and a plano-convex lens 212 form a first microstructure layer 21, a first substrate layer 11 is arranged at the bottom of the first microstructure layer 21 near the prism layer 211, a second substrate layer 12 is arranged at the top of the first microstructure layer 21 near the plano-convex lens 212, and a second microstructure layer 22 is arranged at the side of the second substrate layer 12 away from the first microstructure layer 21. It can be understood that by arranging the first substrate layer 11, the second substrate layer 12 and the second microstructure layer 22 on both sides of the prism layer 211 and the plano-convex lens 212, respectively, it is possible to apply the composite microstructure to the composite optical film, thereby achieving a good use effect; at the same time, it is also possible to achieve the effect of improving the optical performance of the composite optical film, such as brightness gain.
[0050] The first substrate layer 11 and the second substrate layer 12 refer to basic material layers, which can achieve good fixing and supporting effects. In the present application, the first substrate layer 11 is the lower substrate layer, and the second substrate layer 12 is the upper substrate layer, which can achieve good top and bottom supporting effects, and can also achieve good coordination effects with other components, thereby achieving multiple functional effects.
[0051] The second microstructure layer 22 is a conventional prism structure in the field of optical films, and may be the structure of the prism layer 211 mentioned in the present application, and is not limited in the present application.
[0052] Furthermore, a back coating layer 30 is provided on the side of the first substrate layer 11 away from the first microstructure layer 21. It can be understood that by providing the back coating layer 30 at the bottom of the first substrate layer 11, it is possible to reduce reflection and increase the uniformity of the transmitted light, while reducing the intensity of the light, making the visual effect softer and reducing the glare effect. Preferably, the back coating layer 30 is a 3% haze coating, which can achieve a good anti-adsorption effect.
[0053] Furthermore, the first substrate layer 11 and the second substrate layer 12 are polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride or polystyrene. It is understood 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.
[0054] like Figure 6 As shown, a plurality of prism layers 211 are sequentially arranged in an array along a preset direction on the first substrate layer 11, and a plurality of plano-convex lenses 212 are sequentially arranged in an array at the edges 2111 of the plurality of prism layers 211;
[0055] Among them, a plurality of the plano-convex lenses 212 are arranged tangentially to each other, and the centers of the plano-convex lenses 212 arranged adjacently in the horizontal direction, and the horizontal extension line of the intersection of a center of a circle and the plano-convex lenses 212 arranged adjacently in the direction of the edge 2111 of the prism layer 211 are located at the same horizontal position to form a minimum array unit. It can be understood that by arranging a plurality of plano-convex lenses 212 in a tightly fitted manner, a plano-convex lens 212 is arranged tangentially to two adjacent plano-convex lenses 212, and arraying them in sequence according to this structure, a honeycomb tightly arranged structure is finally formed.
[0056] like Figure 7 As shown, a plurality of prism layers 211 are sequentially arranged in an array along a preset direction on the first substrate layer 11, and a plurality of plano-convex lenses 212 are sequentially arranged in an array at the edges 2111 of the plurality of prism layers 211;
[0057] Among them, the plurality of plano-convex lenses 212 are arranged tangentially to each other, and the centers of the plano-convex lenses 212 arranged adjacent to each other in the horizontal direction are located at the same horizontal position. It can be understood that by arranging the plurality of plano-convex lenses 212 in an orderly adjacent array one by one, that is, in a matrix arrangement, another structural form of a composite optical film can be obtained.
[0058] The specific examples are further described below:
[0059] The 16-inch backlight module includes a reflective film, a light guide plate, a diffusion film, and the brightness enhancement film in the embodiment and the comparative example. The brightness effect is calculated by taking the average of three measurements. The relative brightness calculation uses the comparative example 1 as the standard sample, and assumes that its average brightness value is 100%. The obtained ratio is the relative brightness.
[0060] Example 1
[0061] like Figure 5-6 As shown, the first substrate layer 11 is 125 μm polyethylene terephthalate (PET), and the prism layer 211 is a prism structure with a bottom width of 70 μm. The refractive index of the photocurable glue of the prism layer 211 is 1.5-1.7.
[0062] The plano-convex lens 212 is disposed on the lower surface of the second substrate layer 12; the specific dimensions are: the plano-convex lens 212 has an outer diameter of 80 μm and a focal length of 35 μm, and the subunits of the plano-convex lens 212 are closely arranged in a honeycomb shape, such as Figure 6 As shown, the refractive index of the glue of the plano-convex lens 212 is 1.5-1.7.
[0063] The second substrate layer 12 is 100 μm polyethylene terephthalate (PET). The second microstructure layer 22 is disposed on the upper surface of the second substrate layer 12, and has specific dimensions of: a randomly distributed microlens structure with a diameter of 30 μm and a focal length of 10 μm.
[0064] According to the microstructure design, it can be named MOLP (Microlens on Lens with Prism).
[0065] The back side of the first substrate layer 11 of the composite optical film is provided with an anti-adsorption 3% haze coating.
[0066] At this time, after testing, the performance parameters of the composite optical film are: relative brightness is 105.4%.
[0067] Example 2
[0068] like Figure 5 and 7 As shown, the difference between Example 2 and Example 1 is that the plano-convex lens 212 is arranged on the lower surface of the second substrate layer 12; the specific dimensions are: the plano-convex lens 212 has an outer diameter of 70 μm and a focal length of 30 μm, and the sub-units of the plano-convex lens 212 are arranged in a matrix.
[0069] At this time, after testing, the performance parameters of the composite optical film are: relative brightness is 104.3%.
[0070] Example 3
[0071] The difference between Example 3 and Example 1 is that the second microstructure layer 22 is disposed on the upper surface of the second substrate layer 12 and has a specific size of a prism structure with a bottom width of 30 um.
[0072] According to the microstructure design, it can be named POLP (Prism on Lens with Prism).
[0073] At this time, after testing, the performance parameters of the composite optical film are: relative brightness is 116.6%.
[0074] Example 4
[0075] The difference between Example 4 and Example 1 is that the plano-convex lens 212 is arranged on the lower surface of the second substrate layer 12; the specific dimensions are: the plano-convex lens 212 has an outer diameter of 70 μm and a focal length of 30 μm, and the subunits of the plano-convex lens 212 are arranged in a matrix, such as Figure 7 shown.
[0076] The second microstructure layer 22 is disposed on the upper surface of the second substrate layer 12 , and has a specific size of a prism structure with a bottom width of 30 um.
[0077] At this time, after testing, the performance parameters of the composite optical film are: relative brightness is 115.8%.
[0078] Comparative Example 1
[0079] The difference between Comparative Example 1 and Example 1 is that the conventional MOP optical film does not have a plano-convex lens 212 .
[0080] At this time, after testing, the performance parameter of the composite optical film is: relative brightness is 100%.
[0081] Comparative Example 2
[0082] The difference between Comparative Example 2 and Example 1 is that, in the conventional POP optical film, the specific size of the second microstructure layer 22 is: a prism structure with a bottom width of 30 um.
[0083] At this time, after testing, the performance parameters of the composite optical film are: relative brightness is 112.3%.
[0084] The results of various embodiments and comparative examples are shown in Table 1:
[0085]
[0086]
[0087] From the above test results we can see that:
[0088] 1. It can be seen from Examples 1-2 that the optical structure of the present application can improve the brightness gain.
[0089] 2. It can be seen from Examples 1 and 3-4 that when the optical structure of the present application is adopted and a second microstructure layer is added, the brightness gain is further improved.
[0090] 3. It can be seen from Comparative Example 1 and Examples 1-2 that the relative brightness of the conventional MOP optical film is lower than the relative brightness of the optical structure of the present application.
[0091] 4. It can be seen from Comparative Example 2 and Examples 3-4 that the relative brightness of the conventional POP optical film is lower than the relative brightness of the optical structure of the present application.
[0092] The present application also relates to a backlight module, comprising the composite optical film as described above.
[0093] 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 composite microstructure, characterized in that include: a prism layer (211); and a plano-convex lens (212) connected to the prism layer (211); The convex surface of a plano-convex lens (212) is disposed against an edge (2111) of a prism layer (211) to form an optical lens unit.
2. The composite microstructure according to claim 1, characterized in that: The convex vertex of a plano-convex lens (212) is connected to an edge (2111) of a prism layer (211) to form an optical lens unit.
3. The composite microstructure according to claim 1, characterized in that: An adhesive layer (40) is provided on at least one of the adjacent contact surfaces of the prism layer (211) and the plano-convex lens (212).
4. The composite microstructure according to claim 1, characterized in that: An adhesive layer (40) is provided between an edge (2111) of the prism layer (211) and a convex vertex of the plano-convex lens (212).
5. A composite optical film, characterized in that: A composite microstructure comprising any one of claims 1 to 4; The invention also comprises: a prism layer (211) and a plano-convex lens (212) forming a first microstructure layer (21), a first substrate layer (11) being arranged at the bottom of the first microstructure layer (21) close to the prism layer (211), a second substrate layer (12) being arranged at the top of the first microstructure layer (21) close to the plano-convex lens (212), and a second microstructure layer (22) being arranged at the side of the second substrate layer (12) away from the first microstructure layer (21).
6. The composite optical film according to claim 5, characterized in that: A back coating layer (30) is provided on the side of the first substrate layer (11) away from the first microstructure layer (21).
7. The composite optical film according to claim 5, characterized in that: The first substrate layer (11) and the second substrate layer (12) are made of polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride or polystyrene.
8. The composite optical film according to claim 5, characterized in that: A plurality of prism layers (211) are sequentially arranged in an array along a preset direction on the first substrate layer (11), and a plurality of plano-convex lenses (212) are sequentially arranged in an array at the edges (2111) of the plurality of prism layers (211); The plurality of plano-convex lenses (212) are arranged tangentially to each other in pairs, and the centers of the plano-convex lenses (212) adjacently arranged in the horizontal direction, and the horizontal extension line of the intersection of a center of a circle and the plano-convex lenses (212) adjacently arranged in the direction of the edge (2111) of the prism layer (211) are located at the same horizontal position, so as to form a minimum array unit.
9. The composite optical film according to claim 5, characterized in that: A plurality of prism layers (211) are sequentially arranged in an array along a preset direction on the first substrate layer (11), and a plurality of plano-convex lenses (212) are sequentially arranged in an array at the edges (2111) of the plurality of prism layers (211); Wherein, the plurality of plano-convex lenses (212) are arranged tangentially to each other in pairs, and the centers of the plano-convex lenses (212) arranged adjacent to each other in the horizontal direction are located at the same horizontal position.
10. A backlight module, characterized in that: The composite optical film comprises the composite optical film as described in any one of claims 5 to 9.