Composite laminating film with high color gamut

Abstract

The invention discloses a high-color-gamut composite laminating film which sequentially comprises the following components from top to bottom: a first structural layer film which comprises a diffusion layer and a first base film; a first composite adhesive layer; the second structural layer film comprises an upper prism layer, a second base film and a second composite adhesive layer; the third structural layer film comprises a lower prism layer and a third base film; a back coating; through the structural design of the mixed QD particle glue layer, the mixed QD particle glue layer is used for laminating the lowest layer of the brightness enhancement film on the liquid crystal backlight module in a multi-layer manner, the PET surface is uniformly coated with the mixed QD particle glue layer by adopting the processing of liquid transfer of the micro-concave roller, and the design scheme adopted by the invention not only ensures the material brightness, but also improves the image quality, the color accuracy and the ornamental value; on the premise of ensuring that the brightness meets the requirement of a liquid crystal display product, the shielding property meets the requirement, interference and glare are avoided, and the visual effect reaches the standard.

Description

Technical Field

[0001] The present invention belongs to the technical field related to quantum dot display, and in particular relates to a composite laminating film with a high color gamut. Background Art

[0002] As traditional display technology is limited by the color range and cannot accurately reproduce some highly saturated and pure colors, the picture performance is not so satisfactory. The wide color gamut and high color saturation of quantum dot TVs are then reproduced before people's eyes.

[0003] Most of the quantum dot TVs on the market are high-end models, which use blue light to excite the full-concentration QD film to produce high-purity colors, achieve a significant improvement in color gamut coverage, and make the colors more realistic and full. Samsung's cadmium-free quantum dot backlight technology uses blue LED lights to excite the cadmium-free quantum dot film. The color of this method is relatively pure, but the red and green peaks are lower. Compared with the wide color gamut of phosphors, the color gamut advantage is not obvious. It is usually used in Samsung's mid- and low-end QLED quantum dot TV models, and other TV brands are basically not involved.

[0004] This technology builds on the existing foundation by placing mixed QD particles in a bonding adhesive layer. The uniform coating results in a more uniform color display, lower cost in quantum dot TVs, and more suitable for the mid- and low-end market. Summary of the invention

[0005] The object of the present invention is to provide a composite laminating film with a high color gamut, so as to solve the problem of high cost in order to enhance the display effect proposed in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a high color gamut composite laminating film, comprising, from top to bottom:

[0007] A first structural layer film, wherein the first structural layer film comprises a diffusion layer and a first base film, wherein the diffusion layer is disposed on an upper surface of the first base film, and the diffusion layer contains one of PBMA or PMMA microbeads;

[0008] A first composite adhesive layer, wherein the first composite adhesive layer contains PBMA or PMMA microbeads;

[0009] A second structural layer film, wherein the second structural layer film comprises an upper prism layer and a second base film, and the upper prism layer is arranged on an upper surface of the second base film;

[0010] A second composite adhesive layer, wherein the second composite adhesive layer contains one of PBMA or PMMA microbeads and mixed QD particles;

[0011] A third structural layer film, the third structural layer film comprising a lower prism layer and a third base film, the lower prism layer being arranged on an upper surface of the third base film;

[0012] A back coating layer is disposed on the lower surface of the third base film, and the back coating layer contains one of PBMA or PMMA microbeads.

[0013] Preferably, the first base film, the second base film and the third base film are all made of 100-micron optical-grade chemically treated PET film.

[0014] Preferably, the diffusion layer is formed by a plurality of PMMA microbeads or PBMA microbeads distributed to form a micro-convex structure layer, and the height of the micro-convex structure layer is 5 to 10 microns.

[0015] Preferably, the PMMA microbeads or PBMA microbeads in the first composite adhesive layer and the second composite adhesive layer have a particle size of 2-5 microns.

[0016] Preferably, the upper prism layer and the lower prism layer are both composed of a plurality of prisms arranged continuously, and the prisms of the upper prism layer and the lower prism layer are both isosceles triangle structures, with a bottom width of 60 to 70 microns, a triangle height of 30 to 35 microns, and an angle of 88° to 90°.

[0017] Preferably, the prism structure of the upper prism layer itself will have a rotation angle during processing, and the rotation angle is between 8° and 45°.

[0018] Preferably, the prism structure of the lower prism layer itself will have a rotation angle during processing, and the rotation angle is between 135° and 98°.

[0019] Compared with the prior art, the present invention provides a composite laminating film with a high color gamut, which has the following beneficial effects:

[0020] The present invention designs a mixed QD particle glue layer structure, which is used for the bottommost film of the multi-layer lamination brightness enhancement film of the liquid crystal backlight module, and adopts a micro-concave roller liquid transfer process to evenly coat the mixed QD particle glue layer on the PET surface. The design scheme adopted by the present invention not only ensures the brightness of the material, but also improves the image quality, color accuracy and ornamental value. Under the premise of ensuring that the brightness meets the requirements of liquid crystal display products, the present invention meets the requirements of shielding, ensures that there is no interference and glare, and the visual effect meets the standard, and reduces the cost, and can be widely used in mid- and low-end TVs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a high color gamut composite laminating film proposed by the present invention. DETAILED DESCRIPTION

[0023] The following will compare the existing technology with the technology of the present invention, and combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] There are similar QD hybrid technology solutions on the market: hybrid QD diffuser plate, hybrid QD diffuser sheet and hybrid QD back coating sheet.

[0025] Mixed QD diffuser plate: QD liquid is added to the raw materials of the diffuser plate, mixed evenly according to the proportion, and then extruded together.

[0026] Mixed QD diffuser: QD liquid is mixed into the slurry for diffusion coating, mixed evenly according to the proportion, and then evenly coated on the PET surface.

[0027] Mixed QD back coating film: QD liquid is mixed into the back coating slurry, mixed evenly according to the proportion, and then evenly coated on the PET surface.

[0028] The following table is a comparison of the amount of QD liquid added in the existing QD mixing technology solution on the market and the technical solution of the present invention:

[0029] Classification QD liquid addition amount (Kg / ㎡) Hybrid QD Diffuser Plate 0.000184 Hybrid QD Diffuser 0.000172 Hybrid QD back coating 0.000176 Mixed QD particle layer composite sheet 0.000131

[0030] The above three existing technologies have the same technical disadvantage: excessive contact with air leads to fast failure. QD particles need to contact a certain amount of air, and refraction in the air will eventually improve the color gamut. If too much is exposed to the air, it will cause fast failure, and the effect of QD in improving the color gamut will be lost within a few months.

[0031] Classification Expiration time Hybrid QD Diffuser Plate 4-6 months Hybrid QD Diffuser 4-6 months Hybrid QD back coating 4-6 months Mixed QD particle layer composite sheet 10-12 months

[0032] Based on the three technical solutions, the applicant discovered that QD particles need air but cannot be exposed to a large amount of air. Based on this, the applicant proposed mixing QD in the prism layer of the composite film. When the composite film is bonded, there is a certain amount of air in the prism layer and the bonding adhesive layer. This part of air can make the QD particles refract without excessively causing the visual effect of the QD particles to be too fast. However, the above solution has a fatal flaw - uniformity. Because adding QD particles to the prism layer will cause small protrusions on the peaks of the prism, and because QD is a nano-scale particle, it will not cover the prism peak evenly, which will result in poor brightness and color uniformity of the final product.

[0033] After repeated research and demonstration, a technical solution is proposed: please refer to Figure 1 A high color gamut composite bonding film, comprising, from top to bottom: a first structural layer film, the first structural layer film comprising a diffusion layer and a first base film, the diffusion layer being arranged on the upper surface of the first base film, the diffusion layer containing one of PBMA or PMMA microbeads; a first composite adhesive layer, the first composite adhesive layer containing one of PBMA or PMMA microbeads; a second structural layer film, the second structural layer film comprising an upper prism layer and a second base film, the upper prism layer being arranged on the upper surface of the second base film; a second composite adhesive layer, the second composite adhesive layer containing one of PBMA or PMMA microbeads and mixed QD particles; a third structural layer film, the third structural layer film comprising a lower prism layer and a third base film, the lower prism layer being arranged on the upper surface of the third base film; a back coating layer, the back coating layer being arranged on the lower surface of the third base film, the back coating layer containing one of PBMA or PMMA microbeads.

[0034] The first structural layer uses a 100-micron optical-grade chemically treated PET film; the microconvex structural layer is composed of a plurality of PMMA microbeads or PBMA microbeads, and the structure height is 5 to 10 microns. The microbeads make the base film surface haze reach 80%-90%. A composite adhesive layer is provided on the lower surface of the first base film; PMMA microbeads or PBMA microbeads with a particle size of 2-5 microns are dispersed in the first composite adhesive layer, and the PMMA microbeads or PBMA microbeads make the composite adhesive layer haze reach 3%-60%; the upper prism is attached to the first base film through the first composite adhesive layer.

[0035] The second structural layer film 100 uses a micron optical grade chemically treated PET film; the upper prism is an isosceles triangle structure, the bottom width is 60 to 70 microns, the triangle height is 30 to 35 microns, and the angle is 88° to 90°. In addition, the prism structure itself will have a rotation angle during processing, and the rotation angle can be between 8° and 45°. The prism structure has its own rotation angle mode, which can effectively reduce the risk of interference between the upper and lower prisms. A mixed QD composite adhesive layer is provided on the lower surface of the second base film; the second composite adhesive layer contains dispersed QD particles or QD particles and PMMA microbeads or PBMA microbeads with a particle size of 2-5 microns. The QD particles and PMMA microbeads or PBMA microbeads are evenly mixed and then coated to make the haze of the composite adhesive layer reach 3%-60%; the lower prism is attached to the second base film through the second composite adhesive layer.

[0036] The third structural layer uses a 100-micron optical-grade chemically treated PET film; the lower prism is an isosceles triangle structure, with a bottom width of 60 to 70 microns, a triangle height of 30 to 35 microns, and an angle of 88° to 90°. The prism structure itself will rotate during processing, and the rotation angle can be between 135° and 98°. The prism structure has its own rotation angle, which can effectively reduce the risk of interference between the upper and lower prisms. This structure improves the product's shielding while ensuring brightness. The back coating is set on the lower surface of the third base film and contains PBMA or PMMA microbeads, and the haze can be between 3% and 12%.

[0037] The technical solution provided by the above embodiment provides the following data:

[0038]

[0039] It can be seen from the above table that under the QDPP+diffuser plate architecture adopted in the technical solution of the present invention, the color gamut is improved by about 2%.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite laminating film with a high color gamut, characterized in that: From top to bottom, they include: A first structural layer film, wherein the first structural layer film comprises a diffusion layer and a first base film, wherein the diffusion layer is disposed on an upper surface of the first base film, and the diffusion layer contains one of PBMA or PMMA microbeads; A first composite adhesive layer, wherein the first composite adhesive layer contains PBMA or PMMA microbeads; A second structural layer film, wherein the second structural layer film comprises an upper prism layer and a second base film, and the upper prism layer is arranged on an upper surface of the second base film; A second composite adhesive layer, wherein the second composite adhesive layer contains one of PBMA or PMMA microbeads and mixed QD particles; A third structural layer film, the third structural layer film comprising a lower prism layer and a third base film, the lower prism layer being arranged on an upper surface of the third base film; A back coating layer is disposed on the lower surface of the third base film, and the back coating layer contains one of PBMA or PMMA microbeads.

2. The high color gamut composite laminating film according to claim 1, characterized in that: The first base film, the second base film and the third base film are all made of 100-micron optical-grade chemically treated PET film.

3. The high color gamut composite laminating film according to claim 1, characterized in that: The diffusion layer is formed by a plurality of PMMA microbeads or PBMA microbeads distributed to form a micro-convex structure layer, and the height of the micro-convex structure layer is 5 to 10 microns.

4. The high color gamut composite laminating film according to claim 1, characterized in that: The PMMA microbeads or PBMA microbeads in the first composite adhesive layer and the second composite adhesive layer have a particle size of 2-5 microns.

5. The high color gamut composite laminating film according to claim 1, characterized in that: The upper prism layer and the lower prism layer are both composed of a plurality of prisms arranged continuously. The prisms of the upper prism layer and the lower prism layer are both isosceles triangle structures, with a bottom width of 60 to 70 microns, a triangle height of 30 to 35 microns, and an angle of 88° to 90°.

6. The high color gamut composite laminating film according to claim 5, characterized in that: The prism structure of the upper prism layer will rotate at an angle during processing, and the rotation angle is between 8° and 45°.

7. The high color gamut composite laminating film according to claim 5, characterized in that: The prism structure of the lower prism layer will rotate at an angle during processing, and the rotation angle is between 135° and 98°.

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