A novel MOP composite film and display device

Abstract

The utility model provides a novel MOP composite film mainly used in large -size television, replaces MOP laminated film + diffusion plate module with MOP laminated film + diffusion film module in large -size television, can make product overall thickness thinning, is favorable to the thinning of product, can carry out the lamination of MOP laminated film and diffusion film in the same production factory in the production process, simplifies production technology, promotes production efficiency. And the diffusion film in the MOP composite film in the application, the one side of base material layer sets up the microlens structure of the size random distribution along the horizontal direction according to diameter and height. The microlens structure is smaller, can carry out the diffusion of light, promotes the uniformity of diffuse light, and this random irregular arrangement, its haze promotion, can improve the shielding performance of product, the microlens structure in the utility model is collocated with high haze back coating, and the whole can reach the diffusion effect of diffusion plate.

Description

Technical Field

[0001] This utility model relates to the field of display devices, and in particular to a novel MOP composite film and display device. Background Technology

[0002] Currently, in the large-screen TV market, MOP (Modular Optical Precipitation) lamination films are used in conjunction with diffusers in the backlight module architecture. These films serve as functional films for brightness enhancement, diffusion, and light focusing, replacing traditional multi-layer films. This results in thinner, brighter screens, more efficient assembly, and reduced production costs. The MOP lamination film, a mainstream lamination film, consists of two layers. The lower layer employs a prism structure, composed of multiple prism arrays in a single direction, enabling efficient and uniform light distribution. The upper layer is a micro-convex lens structure. The MOP lamination film primarily enhances brightness; the diffuser mainly distributes and disperses the light source evenly.

[0003] With the widespread use of MOPs in the market, competition is intensifying, and customers are demanding higher costs. Since both the diffuser plate and the MOP lamination film are independent components, the production and assembly processes, coupled with labor costs, will increase the overall cost of the module, making cost reduction an urgent priority. Furthermore, using the diffuser plate and MOP lamination film together increases the thickness of the entire backlight module, hindering the development of thinner and lighter display devices. Therefore, there is an urgent need to provide a new type of composite film to solve these problems. Utility Model Content

[0004] This utility model provides a novel MOP composite film and display device. The MOP composite film is mainly used in large-size televisions, which can simplify the production process, improve production efficiency, and reduce the overall thickness of the product by more than 50%.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The purpose of this invention is to provide a novel MOP composite film, which comprises, from top to bottom, a microlens film, a prism film, and a diffusion film. The microlens film includes a microlens structure and a first substrate layer, with the microlens structure disposed on one side of the first substrate layer. The prism film comprises, in sequence, a prism structure, a second substrate layer, and a low-haze back coating. The diffusion film comprises, in sequence, a microlens structure, a third substrate layer, and a high-haze back coating. The prism structure is disposed on the side of the first substrate layer away from the microlens. The microlens structure is disposed on the side of the low-haze back coating away from the second substrate layer. The microlens structures are randomly distributed along the horizontal direction.

[0007] Furthermore, the micro-convex lens structures are arranged regularly along the horizontal direction.

[0008] Furthermore, the micro-convex lens structure has a height difference, and the micro-convex lens structures with height differences are arranged cyclically according to a preset period.

[0009] Furthermore, a gap is provided between the adjacent micro-convex lens structures.

[0010] Furthermore, the haze of the low-haze back coating is 3%-10%.

[0011] Furthermore, the diameter and height of the microlens structure are both smaller than those of the microconvex lens structure.

[0012] Furthermore, the height of the microlens is in the ratio of its height to the height of the microlens structure as (1.5-2.5):1.

[0013] Furthermore, the haze of the high-haze back coating is 79%-95%.

[0014] Furthermore, the MOP composite film also includes a fourth substrate layer, which is disposed between the prism film and the diffusion film.

[0015] This utility model also provides a display device, including the above-mentioned MOP composite film.

[0016] The novel MOP composite film provided by this utility model replaces the MOP laminating film + diffuser plate module used in large-size TVs with an MOP laminating film + diffuser film module, which can reduce the overall thickness of the product and facilitate product thinning. In the production process, the MOP laminating film and diffuser film can be laminated at the same manufacturer, simplifying the production process and improving production efficiency.

[0017] The diffusion film in the MOP composite film of this application has microlens structures randomly distributed in diameter and height along the horizontal direction on one side of the substrate layer. These microlens structures are small, allowing for light diffusion and improving the uniformity of diffused light. Furthermore, this random and irregular arrangement increases haze, thereby enhancing the product's shielding performance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below.

[0019] Figure 1 This is a schematic diagram of the MOP composite membrane structure of this utility model;

[0020] Figure 2 This is a schematic diagram of a micro-convex lens film structure according to the present invention.

[0021] In the figure: 1. Microlens film; 11. Microlens structure; 12. First substrate layer; 2. Prism film; 21. Prism structure; 22. Second substrate layer; 23. Low-haze back coating; 3. Diffusion film; 31. Microlens structure; 32. Third substrate layer; 33. High-haze back coating; 111. High-convection microlens; 112. Low-convection microlens. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0023] Existing products used in the backlight modules of large-screen TVs for diffusion and brightness enhancement are mainly combined modules of MOP lamination film and diffuser plate. However, these combined modules are relatively thick and require secondary assembly (the MOP lamination film is laminated first, then assembled with the diffuser plate), resulting in high production costs. Therefore, this invention provides a novel MOP composite film that can solve the above-mentioned problems.

[0024] The novel MOP composite film provided by this utility model includes, from top to bottom: a micro-convex lens film 1, a prism film 2, and a diffusion film 3.

[0025] The micro-convex lens film includes a micro-convex lens structure 11 and a first substrate layer 12, wherein the micro-convex lens structure 11 is disposed on one side of the first substrate layer 12;

[0026] The prism film comprises, in sequence, a prism structure 21, a second substrate layer 22, and a low-haze back coating 23;

[0027] The diffusion film comprises, in sequence, a microlens structure 31, a third substrate layer 32, and a high-haze back coating 33;

[0028] The prism structure 21 is disposed on the side of the first substrate layer 12 away from the microlens structure 11, and the microlens structure 31 is disposed on the side of the low-haze back coating 23 away from the second substrate layer 22.

[0029] The microlens structures 31 are randomly distributed along the horizontal direction. Specifically, the microlens structures 31 are randomly distributed along the horizontal direction according to their different diameters and heights.

[0030] In this invention, the structure of the MOP laminating film and diffuser plate in the backlight module is changed to a structure of MOP laminating film and diffuser film. During the production process, the MOP laminating film and diffuser film can be laminated at the same manufacturer, simplifying the production process, improving production efficiency, and reducing production costs. At the same time, since the diffuser film is thinner than the diffuser plate, the overall thickness of the product can be reduced, which is beneficial for product thinning.

[0031] In the aforementioned MOP composite film, the microlens structures 11 are regularly arranged in the horizontal direction. Specifically, each microlens structure 11 has the same diameter and height. Or as... Figure 2 As shown, the micro-convex lens structure 11 has a height difference. The micro-convex lens structures 11 with height differences are arranged in a cycle according to a preset period, such as one high and N low, where N≥1. One high refers to one high micro-convex lens structure 111, and N low refers to N low micro-convex lens structures 112.

[0032] The diameter of the micro-convex lens structure 11 is 20-80 μm, and the height of the micro-convex lens structure 11 is 18-32 μm. The diameters of the high-convex lens structure 111 and the low-convex lens structure 112 can be the same or different. N low-convex lenses 112 have the same diameter, and the height ratio of the high-convex lens 111 to the low-convex lens 112 is (2-2.5):(1.5-1.8).

[0033] The regularly arranged micro-convex lens structures 11 result in high transmittance and high brightness in the product. However, due to the regular arrangement, the ridges at the bottom of the micro-convex lens structures 11 are regularly distributed, causing interference fringes in the product. Cyclicly arranging the aforementioned high-N-low pattern can reduce the influence of interference fringes, but interference fringes will still exist.

[0034] To further reduce interference fringes, a gap of 10-30 μm is provided between adjacent micro-convex lens structures 11. Due to the presence of the gap, the regularity of the ridges between adjacent micro-convex lens structures 11 is broken, thereby reducing the interference fringes of the product.

[0035] The prism structure 21 has a first prism and a second prism. The first prism has a first height and a first width, and the second prism has a second height and a second width. The first height is 70-78 μm, the second height is 65-75 μm, the first width is 35-45 μm, and the second width is 30-40 μm. The pitch of the prism structure is 60-70 μm. The first prism and the second prism are arranged cyclically along the horizontal direction according to a preset period. The heights of the first prism and the second prism may be equal or unequal, and the widths of the first prism and the second prism may be equal or unequal. Figure 1This is a diagram showing that the first and second prisms have equal height and width.

[0036] The low-haze back coating 23 has a haze setting of 3%-10%. This low-haze back coating can make the light output softer and avoid the appearance of local overly bright or dark areas.

[0037] The microlens structures 31 are randomly distributed horizontally with different diameters and heights. The diameter of the microlens structures 31 is 30-60 μm, and the height is 12-16 μm.

[0038] The microlens structure 31 is also a type of micro-convex lens. Compared to the micro-convex lens structure 11 described above, the diameter and height of the microlens structure 31 in this invention are smaller. The main function of the micro-convex lens 11 is to improve the brightness, energy efficiency, and uniformity of light in the product. The microlens structure 31, being smaller in size, primarily functions to diffuse light and improve the uniformity of diffused light. The preferred height ratio of the micro-convex lens 11 to the microlens structure 31 is (1.5-2.5):1.

[0039] Since the microlens structures 31 are randomly distributed in the horizontal direction with different diameters, this irregular arrangement increases the haze and can improve the product's shielding performance.

[0040] The high-haze back coating 33 has a haze of 50-70%.

[0041] The diffusion film in this invention employs a microlens structure combined with a high-haze back coating, achieving the diffusion effect of a diffusion plate. The overall haze can reach 79-95%. Haze below this range affects the uniformity of light transmission, while haze above it leads to brightness loss. The transmittance is between 60-85%, ensuring the product's brightness.

[0042] The novel MOP composite film further includes a fourth substrate layer (not shown in the figure), which is disposed between the prism film 2 and the diffusion film 3. Adding the fourth substrate layer improves the overall stiffness of the MOP composite film. The thickness of the fourth substrate layer is 200-250 μm.

[0043] The micro-convex lens film 1, prism film 2 and diffusion film 3 are bonded together with UV-curable adhesive, and the thickness of the bonding layer is 0.5-5μm. The bonding layer is not shown in the figure.

[0044] Traditional diffusers rely on internal particles or surface irregularities for reflection and scattering, selectively absorbing or scattering different wavelengths of light (such as red, green, and blue), resulting in a color shift in the output light. In contrast, the microlens structure of this invention is manufactured using high-precision microfabrication, offering superior color reproduction compared to diffusers.

[0045] The first substrate layer 12, the second substrate layer 22, the third substrate layer 32, and the fourth substrate layer can be made of the same material or different materials. Preferably, the first substrate layer 12, the second substrate layer 22, the third substrate layer 32, and the fourth substrate layer are made of the same material. Substrates made of the same material have the same shrinkage rate, which can reduce the risk of warping.

[0046] Traditional diffuser plates are approximately 1500 μm thick, MOP bonding film is approximately 320 μm thick, and the overall module thickness is 1820 μm. In this invention, the diffuser film is approximately 280 μm thick, and with the addition of a fourth substrate layer to increase stiffness and the MOP bonding film, the overall thickness is approximately 850 μm, representing a thickness reduction of over 50%.

[0047] The novel MOP composite film provided by this utility model has a significant cost advantage because the diffusion film and the MOP bonding film can be produced and bonded in the same manufacturer, reducing production and assembly steps, increasing labor costs, and reducing process losses.

[0048] The MOP composite film provided by this utility model can also improve product brightness. In traditional diffuser plates, there is some light loss during the multiple reflections and refractions between the MOP film and the diffuser plate. However, the composite film in this application adopts a fully integrated lamination, reducing the space between layers and reducing light loss. Secondly, due to the reduction in the overall thickness of the product, the light propagation efficiency can be improved. Overall, the brightness can be improved by about 10-15%.

[0049] This utility model also provides a display device, including the novel MOP composite film as described above.

[0050] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A novel MOP composite membrane, characterized in that, From top to bottom, it includes a micro-convex lens film, a prism film, and a diffusion film; The micro-convex lens film includes a micro-convex lens structure and a first substrate layer, wherein the micro-convex lens structure is disposed on one side of the first substrate layer; The prism film comprises, in sequence, a prism structure, a second substrate layer, and a low-haze back coating; The diffusion film comprises, in sequence, a microlens structure, a third substrate layer, and a high-haze back coating; The prism structure is disposed on the side of the first substrate layer away from the microlens; the microlens structure is disposed on the side of the low-haze back coating away from the second substrate layer; The microlens structures are randomly distributed along the horizontal direction.

2. The MOP composite membrane according to claim 1, characterized in that, The micro-convex lens structures are arranged regularly in the horizontal direction.

3. The MOP composite membrane according to claim 2, characterized in that, The micro-convex lens structure has a height difference, and the micro-convex lens structures with height differences are arranged cyclically according to a preset period.

4. The MOP composite membrane according to any one of claims 1-3, characterized in that, A gap is provided between adjacent micro-convex lens structures.

5. The MOP composite membrane according to claim 1, characterized in that, The haze of the low-haze back coating is 3%-10%.

6. The MOP composite membrane according to claim 1, characterized in that, The diameter and height of the microlens structure are both smaller than those of the microconvex lens structure.

7. The MOP composite membrane according to claim 6, characterized in that, The ratio of the height of the microlens to the height of the microlens structure is (1.5-2.5):

1.

8. The MOP composite membrane according to claim 1, characterized in that, The haze of the high-haze back coating is 79%-95%.

9. The MOP composite membrane according to claim 1, characterized in that, It also includes a fourth substrate layer, which is disposed between the prism film and the diffusion film.

10. A display device, characterized in that, Includes the MOP composite membrane according to any one of claims 1-9.

Images