Brightness enhancement film with optimized color shift and method of producing the same

Abstract

The application discloses a color deviation optimizing brightness enhancement film and a production method thereof, and belongs to the technical field of optical films. The color deviation optimizing brightness enhancement film comprises a substrate layer, a microstructure layer and a color deviation correction layer, the surface of the substrate layer is provided with the microstructure layer, the color deviation correction layer comprises alternately stacked low-refractive layers and high-refractive layers, the low-refractive layers and the high-refractive layers are each provided with not less than three layers, and the surface of the uppermost high-refractive layer is covered with an anti-reflection layer. The application solves the color deviation problem of the existing brightness enhancement film. The color deviation optimizing brightness enhancement film and the production method thereof are provided, a micrometer-level lens array is formed through precision mold pressing, the directional transmission efficiency of light is improved, the thickness of each layer of the color deviation correction layer and the material selection are finely adjusted, the specific wavelength light is enhanced or weakened, and the purpose of color deviation correction is achieved.

Description

Technical Field

[0001] This invention relates to the field of optical thin film technology, specifically to a brightness enhancement film with optimized color shift and its manufacturing method. Background Technology

[0002] In modern display technology, brightness enhancement films are key components for improving the brightness and contrast of display devices, and their performance directly affects the display effect. However, traditional brightness enhancement films often suffer from color shift problems, meaning that colors change at different viewing angles, affecting the realism and visual appeal of images. Therefore, developing a brightness enhancement film that can effectively optimize color shift is of great significance for improving display quality. Summary of the Invention

[0003] The purpose of this invention is to provide a brightness enhancement film that can optimize color shift and its production method. By forming a micron-level lens array through precision mold imprinting, the angular distribution of incident light is optimized, light scattering loss is reduced, and the directional transmission efficiency of light is improved. The thickness and material selection of each layer of the color shift correction layer are finely adjusted to enhance or weaken light of specific wavelengths, thereby achieving the purpose of color shift correction, improving the color performance and visual experience of display devices, and solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a brightness enhancement film that can optimize color shift, comprising a substrate layer, a microstructure layer and a color shift correction layer, wherein the substrate layer is provided with a microstructure layer, and the color shift correction layer comprises alternating stacked low refractive index layers and high refractive index layers, wherein both the low refractive index layer and the high refractive index layer are provided with no less than three layers, and the surface of the uppermost high refractive index layer is covered with an anti-reflection layer.

[0005] Preferably, the base layer is made of the following materials by weight percentage: PC resin: 70-95%, glass fiber: 5-20%, heat stabilizer: 0.1-0.5%, antioxidant: 0.1-0.5%, and lubricant: 0.1-1%.

[0006] Preferably, the microstructure layer includes a lens array and a gap filler, with the gap filler distributed in the gaps between the lens arrays.

[0007] Preferably, the lens array is an array of aspherical lenses formed using imprinting technology, and the aspherical lenses are at the micrometer level.

[0008] Preferably, the gap filler is an adhesive product whose refractive index matches that of the lens array. The adhesive product is one of acrylic-based adhesive, epoxy resin-based adhesive, silicone-based adhesive, and polyurethane-based adhesive. The refractive index of the adhesive product is about 1.58, which matches the refractive index of the PC material.

[0009] Preferably, the low refractive index layer is formed by vapor deposition using one of the following materials: silicon dioxide, magnesium fluoride, calcium fluoride, and aluminum oxide.

[0010] Preferably, the high refractive index layer is formed by vapor deposition using one of the following materials: titanium oxide, zirconium oxide, tantalum oxide, and silicon nitride.

[0011] Preferably, both the low-refractive-index layer and the high-refractive-index layer are configured as an odd number of layers.

[0012] Another technical problem to be solved by the present invention is to provide a method for producing a brightness enhancement film with optimized color shift, comprising the following steps:

[0013] Step 1: Mix PC resin, glass fiber, heat stabilizer, antioxidant and lubricant, and inject under high pressure into a mold to form the base layer;

[0014] Step 2: Clean the surface of the base layer, use a high-precision mold to form a predetermined lens array pattern on the base layer through a hot pressing process, clean the lens array, inject the gap filling material into the gaps of the lens array using a syringe, use a vacuum degassing machine to help remove any air bubbles that may be present, after curing, remove excess glue to form a microstructure layer;

[0015] Step 3: Clean the surface of the microstructure layer, and use vacuum evaporation technology to deposit alternating stacked low refractive index layers and high refractive index layers on the surface of the microstructure layer to form a color shift correction layer;

[0016] Step 4: Deposit an anti-reflective layer onto the surface of the color deviation correction layer to form a brightness enhancement film.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention proposes a brightness enhancement film with optimized color shift and its manufacturing method. The base layer uses a high-transparency PC material as the basic support layer for the entire brightness enhancement film, ensuring the film's stability and durability. On the base layer, a micron-level lens array is formed by precision mold imprinting to optimize the angular distribution of incident light, reduce light scattering loss, and improve the directional transmission efficiency of light. The color shift correction layer, located above the microstructure layer, is composed of multiple layers of optical materials with different refractive indices stacked alternately. By finely adjusting the thickness and material selection of each layer, the enhancement or reduction of light at specific wavelengths can be achieved, thus achieving the purpose of color shift correction. It can effectively compensate for color shift caused by angular changes, maintaining color consistency and authenticity. The outermost layer is covered with an ultra-thin anti-reflective layer to reduce ambient light reflection interference, improve display clarity and viewing angle. This brightness enhancement film can significantly reduce color shift and improve the color performance and visual experience of display devices. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a brightness enhancement film that can optimize color shift according to Embodiment 1 of the present invention.

[0020] In the diagram: 1. Base layer; 2. Microstructure layer; 21. Lens array; 22. Gap filler; 3. Color shift correction layer; 31. Low refractive index layer; 32. High refractive index layer; 4. Anti-reflection layer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1:

[0023] To address the color cast issue often present in traditional brightness enhancement films—that is, the color changes under different viewing angles, affecting the realism and visual appeal of images—please refer to [the relevant documentation / reference]. Figure 1 This embodiment provides the following technical solution:

[0024] In this embodiment, a brightness enhancement film with optimized color shift includes a base layer 1, a microstructure layer 2, and a color shift correction layer 3. The base layer 1 has a microstructure layer 2 disposed on its surface, serving as the basic support layer for the entire brightness enhancement film. The microstructure layer 2 reduces light scattering loss and improves the directional transmission efficiency of light. The color shift correction layer 3 includes alternating stacked low-refractive-index layers 31 and high-refractive-index layers 32, each with at least three layers, which can effectively compensate for color shift caused by angle changes and maintain color consistency and authenticity. The surface of the uppermost high-refractive-index layer 32 is covered with an anti-reflection layer 4. The ultra-thin anti-reflection layer 4 is used to reduce ambient light reflection interference and improve display clarity and viewing angle.

[0025] In this embodiment, the substrate 1 is made of the following materials by weight percentage: PC resin: 85%, glass fiber: 14.5%, heat stabilizer: 0.2%, antioxidant: 0.2%, and lubricant: 0.1%.

[0026] In this embodiment, the microstructure layer 2 includes a lens array 21 and a gap filler 22. The gap filler 22 is distributed in the gaps between the lens arrays 21. The gaps between the lens arrays 21 are filled with a material with a refractive index matching, which can reduce the refraction loss of light at the interface.

[0027] In this embodiment, the lens array 21 is an array of aspherical lenses formed by imprinting technology. The aspherical lenses are at the micrometer level, which can more effectively correct chromatic aberration. By precisely controlling the curvature of the lens surface, the difference in the focal point of different wavelengths of light is reduced, thereby reducing color shift.

[0028] In this embodiment, the gap filler 22 is an adhesive product with a refractive index that matches that of the lens array 21. The adhesive product is an acrylic ester-based adhesive with a refractive index of about 1.58, which matches the refractive index of the PC material.

[0029] In this embodiment, the low refractive index layer 31 is made of silicon dioxide material by vapor deposition technology. The low refractive index material typically has a refractive index between 1.4 and 1.6, and is used to reduce unwanted wavelengths of light.

[0030] In this embodiment, the high refractive index layer 32 is made of titanium oxide material through vapor deposition technology. High refractive index materials typically have a refractive index of 1.8 or higher and their function is to enhance light of a specific wavelength.

[0031] In this embodiment, both the low refractive index layer 31 and the high refractive index layer 32 are configured as three layers.

[0032] To better demonstrate the production process of a brightness enhancement film with optimized color shift, this embodiment proposes a production method for such a film, comprising the following steps:

[0033] Step 1: Mix PC resin, glass fiber, heat stabilizer, antioxidant and lubricant, and inject into a mold under high pressure to form base layer 1;

[0034] Step 2: Clean the surface of the base layer 1. Thoroughly clean the surface of the lens array 21 with a lint-free cloth and a special cleaning agent to remove any dust, grease or contaminants. Dry it with nitrogen. Using a high-precision mold, form the predetermined lens array 21 pattern on the base layer 1 through a hot pressing process. Clean the lens array 21. Inject the gap filling material 22 into the gaps of the lens array 21 using a syringe to ensure that the glue is evenly distributed and fills all gaps. During the filling process, a scraper can be used to help the glue flow and ensure that no air is trapped in the gaps. Use a vacuum degassing machine to help remove any possible air bubbles. After curing, check the transparent microstructure layer 2 for any unfilled areas or glue overflow. Remove excess glue to form the microstructure layer 2.

[0035] Step 3: Clean the surface of microstructure layer 2, and use vacuum evaporation technology to deposit alternately stacked low refractive index layer 31 and high refractive index layer 32 on the surface of microstructure layer 2. The thicknesses of the bottom low refractive index layer 31 and high refractive index layer 32 to the top high refractive index layer 32 are 102.7nm, 65.2nm, 85.6nm, 54.3nm, 68.5nm, and 43.5nm, respectively, to form color shift correction layer 3;

[0036] Step 4: An anti-reflection layer 4 is deposited on the surface of the color shift correction layer 3. The anti-reflection layer 4 is made of silicon dioxide material with a thickness of 68.5nm to form a brightness enhancement film.

[0037] The prepared brightness enhancement film has the effect of optimizing color shift in visible light at 400nm, 500nm and 600nm.

[0038] Example 2:

[0039] A brightening film was prepared using the same materials as in Example 1:

[0040] Step 1: Mix PC resin, glass fiber, heat stabilizer, antioxidant and lubricant, and inject into a mold under high pressure to form base layer 1;

[0041] Step 2: Clean the surface of the base layer 1, use a high-precision mold, and form a predetermined lens array 21 pattern on the base layer 1 through a hot pressing process. Clean the lens array 21, inject the gap filling material 22 into the gaps of the lens array 21 using a syringe, use a vacuum degassing machine to help remove any possible air bubbles, and after curing, remove excess glue to form the microstructure layer 2.

[0042] Step 3: Clean the surface of microstructure layer 2, and use vacuum evaporation technology to deposit alternating stacked low refractive index layer 31 and high refractive index layer 32 on the surface of microstructure layer 2. There are five layers of low refractive index layer 31 and high refractive index layer 32. The thicknesses from the bottom low refractive index layer 31 and high refractive index layer 32 to the top high refractive index layer 32 are 102.7nm, 65.2nm, 94.2nm, 59.8nm, 85.6nm, 54.3nm, 77.1nm, 48.9nm, 68.5nm, and 43.5nm, respectively, to form color shift correction layer 3;

[0043] Step 4: An anti-reflection layer 4 is deposited on the surface of the color shift correction layer 3. The anti-reflection layer 4 is made of silicon dioxide material with a thickness of 68.5nm to form a brightness enhancement film.

[0044] The prepared brightness enhancement film has the effect of optimizing color shift for visible light at 400nm, 450nm, 500nm, 550nm and 600nm.

[0045] Example 3:

[0046] A brightening film was prepared using the same materials as in Example 1:

[0047] Step 1: Mix PC resin, glass fiber, heat stabilizer, antioxidant and lubricant, and inject into a mold under high pressure to form base layer 1;

[0048] Step 2: Clean the surface of the base layer 1, use a high-precision mold, and form a predetermined lens array 21 pattern on the base layer 1 through a hot pressing process. Clean the lens array 21, inject the gap filling material 22 into the gaps of the lens array 21 using a syringe, use a vacuum degassing machine to help remove any possible air bubbles, and after curing, remove excess glue to form the microstructure layer 2.

[0049] Step 3: Clean the surface of microstructure layer 2, and use vacuum evaporation technology to deposit alternating stacked low refractive index layer 31 and high refractive index layer 32 on the surface of microstructure layer 2. There are seven layers of low refractive index layer 31 and high refractive index layer 32. The thicknesses from the bottom low refractive index layer 31 and high refractive index layer 32 to the top high refractive index layer 32 are 119.9nm, 76.1nm, 111.3nm, 70.7nm, 102.7nm, 65.2nm, 94.2nm, 59.8nm, 85.6nm, 54.3nm, 77.1nm, 48.9nm, 68.5nm and 43.5nm, respectively, to form color shift correction layer 3;

[0050] Step 4: Deposit an anti-reflection layer 4 on the surface of the color shift correction layer 3. The anti-reflection layer 4 is made of alternating stacks of titanium dioxide and silicon dioxide, with thicknesses of 125 nm and 55 nm for titanium dioxide and silicon dioxide, respectively.

[0051] The prepared brightness enhancement film has the effect of optimizing color shift in visible light of 400nm-700nm.

[0052] In summary, this invention proposes a brightness enhancement film with optimized color shift and its manufacturing method. The base layer 1 uses a high-transparency PC material as the basic support layer for the entire brightness enhancement film, ensuring the film's stability and durability. On the base layer 1, a micron-level lens array 21 is formed by precision mold imprinting to optimize the angle distribution of incident light, reduce light scattering loss, and improve the directional transmission efficiency of light. The color shift correction layer 3, located above the microstructure layer 2, is composed of multiple layers of optical materials with different refractive indices stacked alternately. By finely adjusting the thickness of each layer and the material selection, the enhancement or reduction of light at specific wavelengths can be achieved, thus achieving the purpose of color shift correction. It can effectively compensate for color shift caused by angle changes, maintaining color consistency and authenticity. The outermost layer is covered with an ultra-thin anti-reflection layer 4 to reduce ambient light reflection interference, improve display clarity and viewing angle. This brightness enhancement film can significantly reduce color shift phenomena and improve the color performance and visual experience of display devices.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A brightness enhancement film for optimizing color shift, comprising a substrate layer (1), a microstructure layer (2), and a color shift correction layer (3), characterized in that: The substrate layer (1) has a microstructure layer (2) on its surface. The color shift correction layer (3) includes alternating stacked low refractive index layer (31) and high refractive index layer (32). Both the low refractive index layer (31) and the high refractive index layer (32) have at least three layers. The surface of the uppermost high refractive index layer (32) is covered with an anti-reflection layer (4). The base layer (1) is made of the following materials by weight percentage: PC resin: 70-95%, glass fiber: 5-20%, heat stabilizer: 0.1-0.5%, antioxidant: 0.1-0.5%, lubricant: 0.1-1%; The microstructure layer (2) includes a lens array (21) and a gap filler (22). The gap filler (22) is distributed in the gaps between the lens arrays (21). The lens array (21) is an array of aspherical lenses formed by imprinting technology. The aspherical lenses are at the micrometer level. The gap filler (22) is an adhesive product with a refractive index that matches the lens array (21). The adhesive product is one of acrylic ester-based adhesive, epoxy resin-based adhesive, silicone-based adhesive, and polyurethane-based adhesive.

2. The brightness enhancement film with optimized color shift according to claim 1, characterized in that: The low refractive index layer (31) is made of one of the following materials: silicon dioxide, magnesium fluoride, calcium fluoride, and aluminum oxide, by vapor deposition.

3. The brightness enhancement film with optimized color shift according to claim 2, characterized in that: The high refractive index layer (32) is made of one of the following materials: titanium oxide, zirconium oxide, tantalum oxide, and silicon nitride, by vapor deposition.

4. The brightness enhancement film with optimized color shift according to claim 1, characterized in that: Both the low-refractive-index layer (31) and the high-refractive-index layer (32) are configured as an odd number of layers.

5. A method for producing a brightness enhancement film with optimized color shift as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Mix PC resin, glass fiber, heat stabilizer, antioxidant and lubricant, and inject into mold under high pressure to form the base layer (1); Step 2: Clean the surface of the base layer (1), use a high-precision mold, and form a predetermined lens array (21) pattern on the base layer (1) through hot pressing process. Clean the lens array (21), inject the gap filling (22) material into the gap of the lens array (21) using a syringe, use a vacuum degassing machine to help remove any possible air bubbles, and after curing, remove excess glue to form a microstructure layer (2). Step 3: Clean the surface of the microstructure layer (2), and use vacuum evaporation technology to deposit alternately stacked low refractive index layer (31) and high refractive index layer (32) on the surface of the microstructure layer (2) to form color shift correction layer (3); Step 4: Deposit an anti-reflective layer (4) on the surface of the color deviation correction layer (3) to form a brightening film.

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