High haze lop composite film

Abstract

The utility model discloses a kind of high haze LOP composite films, including by upper and lower sequentially arranged lens structure layer, first substrate layer, diffusion layer, prism structure layer, second substrate layer and adhesive layer, lens structure layer is made of multiple equidistance array arrangement lens unit, lens unit is hemispherical structure, prism structure layer is made of multiple equidistance array arrangement prism unit, prism unit includes high ridge unit and low ridge unit in prism structure layer, and high ridge unit and the low ridge unit staggered arrangement, the ridge height difference between high ridge unit and low ridge unit is 4-10 μm.The utility model is arranged by high ridge unit and low ridge unit staggered arrangement in prism structure layer, light is guided in direction on light side, to improve orthoview brightness, and weaken the interference caused by regular periodic structure;Lens structure layer reduces the coherence of light by hemispherical lens unit, so that while maintaining high haze, brightness, uniformity and viewing angle performance are taken into account.

Description

Technical Field

[0001] This utility model relates to the field of LOP optical films, and more particularly to a high haze LOP composite film. Background Technology

[0002] LOP composite film is an optical film material used in display backlight modules. It typically combines microstructure layers and diffusion layers with different optical functions in the same film structure to scatter and control the direction of light emitted from the backlight source, thereby forming a uniform brightness distribution and good viewing angle effect on the display surface.

[0003] In existing technologies, LOP composite films generally improve brightness in the frontal view direction through periodically arranged prism microstructures, and improve brightness uniformity through a diffusion layer. However, when regular periodic microstructures are superimposed with light guide plate microstructures or display pixel arrays, optical interference is easily generated, resulting in display problems such as moiré patterns, water ripples, or uneven brightness in certain areas. To address these problems, compensation is generally achieved by simply increasing the diffusion degree or superimposing diffusion structures to weaken interference. However, this results in some light energy loss, causing a decrease in brightness in the frontal view direction, making it difficult to balance brightness improvement and display uniformity.

[0004] Therefore, existing technologies have shortcomings and need to be improved. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a high haze LOP composite film with good display effect and can take into account both brightness improvement and display uniformity.

[0006] To achieve this objective, the present invention adopts the following technical solution: a high haze LOP composite film, comprising a lens structure layer, a first substrate layer, a diffusion layer, a prism structure layer, a second substrate layer, and an adhesive layer arranged sequentially from top to bottom;

[0007] The lens structure layer is composed of multiple lens units arranged in an equidistant array. The lens unit has a hemispherical structure and a structural period of 14-18 μm. The prism structure layer is composed of multiple prism units arranged in an equidistant array. The prism unit has a triangular pyramidal structure and a structural period of 40-55 μm.

[0008] The lens units have the same lens height in the lens structure layer. The prism unit in the prism structure layer includes high prism units and low prism units, and the high prism units and low prism units are arranged alternately. The prism height of the high prism unit is 20-40μm, the prism height of the low prism unit is 10-30μm, and the prism height difference between the high prism unit and the low prism unit is 4-10μm.

[0009] Using the above technical solution, in the high haze LOP composite film, the diffusion layer includes a transparent substrate and diffusion particles dispersed in the transparent substrate, wherein the particle size of the diffusion particles is 0.5-10μm.

[0010] Using the above technical solution, in the high haze LOP composite film, the diffusion particles are one of silica microparticles, PMMA microspheres, or PS microspheres.

[0011] Using the above technical solution, in the high haze LOP composite film, the distribution density of the diffused particles in the diffusion layer is 100-300 particles / mm².

[0012] Using the above technical solution, the haze of the diffusion layer in the high haze LOP composite film is 30-40%.

[0013] Using the above technical solution, in the high haze LOP composite film, the apex angle of the prism unit is 85-110°.

[0014] Using the above technical solution, in the high haze LOP composite film, the adhesive layer is an OCA optical adhesive layer with a thickness of 4-30 μm and a refractive index of 1.45-1.60.

[0015] In the high haze LOP composite film described above, both the first substrate layer and the second substrate layer are PET substrate layers.

[0016] Using the above technical solution, in the high haze LOP composite film, the thickness of the first substrate layer and the second substrate layer are both 100-125μm.

[0017] Using the above technical solution, in the high haze LOP composite film, a release film layer is provided at the bottom of the adhesive layer.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention, by setting up an alternating arrangement of high-prism units and low-prism units in the prism structure layer, can guide the light on the incident side, thereby improving the brightness in the frontal view while reducing the interference risk brought by the regular periodic structure; the diffusion layer can expand the angle of the output light through the prism structure layer, making the light distribution more uniform; the hemispherical lens units in the lens structure layer disturb the light to reduce the coherence of the light, thereby maintaining high haze while taking into account the brightness in the frontal view, display uniformity and viewing angle performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0022] Figure 1 This is a schematic diagram of the overall layer structure of this utility model. Detailed Implementation

[0023] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0025] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1As shown, this embodiment of the present invention provides a high haze LOP composite film, comprising, from top to bottom, a lens structure layer 1, a first substrate layer 2, a diffusion layer 3, a prism structure layer 4, a second substrate layer 5, and an adhesive layer 6. The lens structure layer 1 is composed of multiple equidistantly arranged lens units 10, each lens unit 10 having a hemispherical structure and a structural period of 14-18 μm. The prism structure layer 4 is composed of multiple equidistantly arranged prism units 40, each prism unit 40 having a triangular pyramidal structure and a structural period of 40-55 μm. In this embodiment, the structural period of the lens unit 10 is 14 μm. The period is 40μm; the lens unit 10 has the same lens height in the lens structure layer 1; the prism unit 40 in the prism structure layer 4 includes a high prism unit 401 and a low prism unit 402, and the high prism unit 401 and the low prism unit 402 are arranged alternately; the prism height h1 of the high prism unit 401 is 20-40μm, the prism height h2 of the low prism unit 402 is 10-30μm, and the prism height difference between the high prism unit 401 and the low prism unit 402 is 4-10μm. In this embodiment, the prism height h1 of the high prism unit 401 is 20μm, the prism height h2 of the low prism unit 402 is 15μm, and the prism height difference between the high prism unit 401 and the low prism unit 402 is 5μm. The adhesive layer 6 is located on the light-incident side of the composite film and is used to bond with the backlight module side components. The light emitted from the backlight source enters from the light-incident side and propagates along the thickness direction to the light-emitting side. After entering the composite film from the light-incident side, the light emitted from the backlight source first enters the prism structure layer 4. The prism unit 40 guides the light direction with a large structural period of 40 μm, redirecting some of the large-angle light to the normal direction to improve the brightness when viewed directly. At the same time, the high-prism unit 401 and the low-prism unit 402 inside the prism structure layer 4 are arranged alternately to form 5 The μm edge height difference allows light at different positions to have differentiated refraction and reflection paths, thereby weakening the strong diffraction and strong interference conditions caused by the superposition of regular periodic structures, effectively reducing the display risks such as moiré patterns and water ripples. At the same time, the high-edge unit 401 can improve the beam focusing and brightening ability, while the low-edge unit 402 can reduce the bright spots and narrowing of the viewing angle caused by local excessive focusing. The two are set up alternately, so that brightening and uniformity compensate for each other in space. Subsequently, the light enters the diffusion layer 3, which further expands the light and makes the emission angle distribution more uniform, thereby improving the overall haze and brightness uniformity. The diffused light continues to propagate to the lens structure layer 1, where the hemispherical lens unit 10 perturbs the light at a fine scale with a small structural period of 14 μm, further scattering the light before emission and reducing the spatial coherence of the light. This reduces the possibility of interference with the superposition of the light guide plate microstructure or the display pixel array from the source. In this way, the composite film can maintain 30-40% haze while still taking into account the brightness, display uniformity and viewing angle performance.

[0027] Furthermore, the diffusion layer 3 includes a transparent substrate 31 and diffusion particles 32 dispersed in the transparent substrate 31. The particle size of the diffusion particles 32 is 0.5-10 μm, and in this embodiment, the particle size of the diffusion particles 32 is 4 μm. The diffusion particles 32 are dispersed in the transparent substrate 31 as volume scattering units, which allows the light output from the prism structure layer 4 to be scattered in multiple directions within the substrate, forming a continuous diffused light field. This weakens the directional concentration and coherence characteristics of the light before it enters the lens structure layer 1, thereby improving haze and display uniformity while reducing the risk of interference phenomena caused by the superposition of regular microstructures.

[0028] Furthermore, the diffused particles 32 are one of silica microparticles, PMMA microspheres, or PS microspheres. In this embodiment, the diffused particles 32 are silica microparticles. Silica microparticles have high chemical stability and weather resistance, and are not prone to yellowing or performance degradation during film formation, bonding, and long-term use.

[0029] Furthermore, the distribution density of the diffuse particles 32 in the diffusion layer is 100-300 particles / mm². In this embodiment, the distribution density of the diffuse particles 32 in the diffusion layer is 300 particles / mm². In this way, a sufficient number of uniformly distributed volume scattering centers can be provided per unit area, so that the light output from the prism structure layer 4 can form a stable and continuous diffused light field before entering the prism structure layer 4, thereby effectively improving the haze of the film layer and improving the brightness uniformity.

[0030] Furthermore, the haze of the diffusion layer 3 is 30-40%. In this embodiment, the haze of the diffusion layer 3 is 35%. This allows the light output from the prism structure layer 4 to form a more uniform angular distribution before entering the lens structure layer 1, thereby improving the brightness uniformity on the display side and reducing the interference sensitivity caused by the superposition of periodic microstructures.

[0031] Furthermore, the apex angle α of the prism unit 40 is 85-110°. In this embodiment, the apex angle α of the prism unit 40 is 90°. In this way, the light incident from the backlight onto the prism structure layer 4 can be effectively guided and converged in the direction of the normal to the film surface, thereby improving the brightness in the frontal view and increasing the light utilization efficiency.

[0032] Furthermore, the adhesive layer 6 is an OCA optical adhesive layer with a thickness of 4-30 μm and a refractive index of 1.45-1.60. In this embodiment, the OCA optical adhesive layer has a thickness of 10 μm and a refractive index of 1.45. The 10 μm thickness of the adhesive layer ensures that the adhesive layer 6 fully fills the microscopic undulations between adjacent structural layers during the bonding process, avoiding the generation of bubbles or gaps, thereby improving the bonding stability and yield of the composite structure. Controlling the refractive index at 1.45 allows the adhesive layer 6 to better match the refractive index between the PET substrate layer and the transparent resin structural layer, thereby reducing Fresnel reflection and light loss at the interlayer interface and reducing brightness attenuation or stray light caused by the bonding interface.

[0033] Furthermore, both the first substrate layer 2 and the second substrate layer 5 are PET substrate layers, and the thickness of both the first substrate layer 2 and the second substrate layer 5 is 100-125μm. In this embodiment, the thickness of both the first substrate layer 2 and the second substrate layer 5 is 125μm.

[0034] Furthermore, a release film layer 7 is provided at the bottom of the adhesive layer 6, which can protect and isolate the adhesive layer 6, so that the adhesive layer 6 maintains clean and stable adhesion performance before being bonded, and avoids the adhesion performance being affected by dust, oil or accidental adhesion.

[0035] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-haze LOP composite membrane, characterized in that, It includes, from top to bottom, a lens structure layer, a first substrate layer, a diffusion layer, a prism structure layer, a second substrate layer, and an adhesive layer; The lens structure layer is composed of multiple lens units arranged in an equidistant array. The lens unit has a hemispherical structure and a structural period of 14-18 μm. The prism structure layer is composed of multiple prism units arranged in an equidistant array. The prism unit has a triangular pyramidal structure and a structural period of 40-55 μm. The lens units have the same lens height in the lens structure layer. The prism unit in the prism structure layer includes high prism units and low prism units, and the high prism units and low prism units are arranged alternately. The prism height of the high prism unit is 20-40μm, the prism height of the low prism unit is 10-30μm, and the prism height difference between the high prism unit and the low prism unit is 4-10μm.

2. The high haze LOP composite membrane according to claim 1, characterized in that, The diffusion layer comprises a transparent matrix and diffusion particles dispersed in the transparent matrix, wherein the particle size of the diffusion particles is 0.5-10 μm.

3. The high haze LOP composite membrane according to claim 2, characterized in that, The diffused particles are one of silica microparticles, PMMA microspheres, or PS microspheres.

4. The high haze LOP composite membrane according to claim 2, characterized in that, The distribution density of the diffused particles in the diffusion layer is 100-300 particles / mm².

5. The high haze LOP composite membrane according to claim 1, characterized in that, The haze of the diffusion layer is 30-40%.

6. The high haze LOP composite membrane according to claim 1, characterized in that, The apex angle of the prism unit is 85-110°.

7. The high haze LOP composite membrane according to claim 1, characterized in that, The adhesive layer is an OCA optical adhesive layer with a thickness of 4-30 μm and a refractive index of 1.45-1.

60.

8. The high haze LOP composite membrane according to claim 1, characterized in that, Both the first substrate layer and the second substrate layer are PET substrate layers.

9. The high haze LOP composite membrane according to claim 8, characterized in that, The thickness of both the first substrate layer and the second substrate layer is 100-125 μm.

10. The high haze LOP composite membrane according to claim 1, characterized in that, The adhesive layer has a release film layer at the bottom.

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