Full-laminated polarizer integrated with oca optical adhesive layer

Abstract

The utility model discloses a kind of full-laminated polarizing sheets of integrated OCA optical glue layer, it is related to display device technical field, comprising: from top to bottom sequentially arranged upper release film, pressure-sensitive adhesive, first protective layer, polarizing sheet body, second protective layer, integrated OCA optical glue layer and OCA release film;The upper release film, the first protective layer, the polarizing sheet body and the second protective layer are sequentially connected;The integrated OCA optical glue layer connects the OCA release film.The technical problem to be solved by the utility model is to provide a kind of full-laminated polarizing sheets of integrated OCA optical glue layer, the polarizing sheet directly integrates OCA functional layer on polarizing sheet body, realizes integrated structure, to simplify full-laminated procedure, improve laminating yield and product reliability.

Description

Technical Field

[0001] This utility model relates to the field of display device technology, specifically to a fully laminated polarizer with an integrated OCA optical adhesive layer. Background Technology

[0002] With the increasing demands for display quality, thinness, and reliability in electronic devices such as smartphones, tablets, and automotive displays, full lamination technology has become the mainstream process in display manufacturing. Full lamination technology refers to directly bonding the touch screen, cover glass, and liquid crystal display module with optically clear adhesive (OCA), eliminating air gaps. This technology offers advantages such as improved display brightness and contrast, prevention of Newton's rings, reduced dust ingress, and thinner devices.

[0003] The current mainstream full lamination process involves first bonding the OCA adhesive film onto the polarizer, and then aligning and pressing this composite structure with the LCD panel. However, this step-by-step lamination method has the following inherent drawbacks: The process is complicated and costly: it requires separate OCA cutting, film peeling, alignment and pre-application processes, which increases production time and labor costs.

[0004] Yield loss: During the OCA bonding process, bubbles, impurities, wrinkles and misalignment are easily generated, leading to a decrease in yield.

[0005] Adhesive layer interface issues: There is a physical interface between OCA and polarizer. Under environmental changes (such as high temperature and high humidity), internal stress may be generated due to the different expansion coefficients of the two materials, resulting in adhesive layer peeling or abnormal display (such as warping, rainbow patterns).

[0006] Warehousing and management are complex: polarizing film and OCA film need to be purchased and stored separately, which increases supply chain management and inventory costs. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a fully laminated polarizer with an integrated OCA optical adhesive layer. This polarizer directly integrates the OCA functional layer onto the polarizer body to achieve an integrated structure, thereby simplifying the full lamination process and improving the lamination yield and product reliability.

[0008] This utility model achieves its purpose through the following technical solution: A fully laminated polarizer with an integrated OCA optical adhesive layer, characterized in that it comprises, from top to bottom, an upper release film, a pressure-sensitive adhesive, a first protective layer, a polarizer body, a second protective layer, an integrated OCA optical adhesive layer, and an OCA release film; the upper release film, the first protective layer, the polarizer body, and the second protective layer are sequentially connected; the integrated OCA optical adhesive layer is connected to the OCA release film.

[0009] As an optimization, the integrated OCA optical adhesive layer is connected to the second protective layer.

[0010] As an optimization, the second protective layer is connected to the integrated OCA optical adhesive layer via a base coating. This base coating enhances the adhesion between the OCA optical adhesive layer and the polarizer (or its protective layer), prevents delamination, and can also block the migration of small molecules such as plasticizers in the polarizer, thereby improving reliability.

[0011] As an optimization, the thickness of the integrated OCA optical adhesive layer is 25 μm to 200 μm, and its optical refractive index matches the refractive index of the polarizer body 4 and the cover glass / touchscreen below, in order to minimize interface reflection.

[0012] As an optimization, the integrated OCA optical adhesive layer is formed by applying liquid OCA optical adhesive to the second protective layer through precision slit coating, scraping, or microgravure coating, followed by UV curing or thermal curing. This adhesive layer has high light transmittance (>99%), high adhesion, low haze (<0.5%), and excellent weather resistance.

[0013] As an optimization, the first protective layer and the second protective layer include optical protective film substrates TAC, PET and COP.

[0014] As an optimization, the polarizer body is made of PVA polarizing film.

[0015] Compared with related technologies, the fully laminated polarizer with integrated OCA optical adhesive layer provided by this utility model has the following beneficial effects: (1) Simplified process and improved efficiency: When using the product, users (display manufacturers) only need to peel off the release film on the integrated OCA optical adhesive layer to complete the two steps of polarizer attachment and full lamination at one time, eliminating the separate OCA attachment process and greatly improving production efficiency.

[0016] (2) High yield and low cost: It eliminates defects such as bubbles, wrinkles and misalignment caused by OCA bonding alone, and significantly improves product yield. At the same time, it reduces the input of production equipment and labor, and lowers the overall cost.

[0017] (3) Excellent reliability: The integrated structural design reduces material interfaces and lowers the risk of internal stress and delamination caused by inconsistent thermal expansion and contraction. The optimized undercoat technology further ensures the long-term bonding stability between the adhesive layer and the polarizer.

[0018] (4) Excellent optical performance: Through material selection and process control, the integrated OCA layer is ensured to have extremely high light transmittance and extremely low haze, resulting in better display effect.

[0019] (5) Easy to transport and store: It is provided in the form of a single roll or sheet, which simplifies material management and warehousing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the layered structure of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the layered structure of Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the layered structure of the polarizing film roll of this utility model.

[0021] In the diagram: 1. Upper release film, 2. Pressure-sensitive adhesive, 3. First protection, / 4. Polarizing film body, 5. Second protective layer, 6. Pressure-sensitive adhesive layer, 7. Lower release film, 8. Integrated OCA optical adhesive layer, 9. OCA release film, 10. Bottom coating layer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] A fully laminated polarizer with an integrated OCA optical adhesive layer includes, from top to bottom, an upper release film 1, a pressure-sensitive adhesive 2, a first protective layer 3, a polarizer body 4, a second protective layer 5, an integrated OCA optical adhesive layer 8, and an OCA release film 9; the upper release film 1, the first protective layer 3, the polarizer body 4, and the second protective layer 5 are connected in sequence; the integrated OCA optical adhesive layer 8 is connected to the OCA release film 9.

[0024] The integrated OCA optical adhesive layer 8 is connected to the second protective layer 5.

[0025] The second protective layer 5 is connected to the integrated OCA optical adhesive layer 8 via a base coating layer 10. This base coating layer is used to enhance the adhesion between the OCA optical adhesive layer and the polarizer (or its protective layer), prevent delamination, and can also block the migration of small molecules such as plasticizers in the polarizer, thereby improving reliability.

[0026] The thickness of the integrated OCA optical adhesive layer 8 is 25 μm to 200 μm, and its optical refractive index matches the refractive index of the polarizer body 4 and the cover glass / touchscreen below, in order to minimize interface reflection.

[0027] The integrated OCA optical adhesive layer 8 is formed by coating the second protective layer 5 with liquid OCA optical adhesive through precision slit coating, scraping, or microgravure coating, followed by UV curing or thermal curing. This adhesive layer has high light transmittance (>99%), high adhesion, low haze (<0.5%), and excellent weather resistance.

[0028] The first protective layer 3 and the second protective layer 5 include optical protective film substrates TAC, PET and COP.

[0029] The polarizer body 4 is made of PVA polarizing film. Example 1:

[0030] The polarizing film roll is provided, and the roll consists of the following layers from top to bottom: upper release film 1, pressure-sensitive adhesive 2, first protective layer 3 (TAC film, 40μm thick), polarizing film body 4 (PVA polarizing film, 20μm thick), second protective layer 5 (TAC film, 40μm thick), pressure-sensitive adhesive layer 6 (20μm thick), and lower release film 7.

[0031] Below the second protective layer 5, an integrated OCA optical adhesive layer 8 (100 μm thick) is formed directly by coating and curing. This OCA adhesive layer is a UV-curable acrylic optical adhesive. An OCA release film 9 is applied to the lower surface of the OCA optical adhesive layer 7.

[0032] During preparation, a precision slot coater is used to coat the TAC protective layer surface of the polarizing film roll material, after the lower release film 7 and pressure-sensitive adhesive layer 6 have been removed, with liquid OCA of a specific viscosity. It is then passed through a UV curing oven and cured at a dosage of 500 mJ / cm² under nitrogen protection. Finally, an OCA release film 9 is applied and the roll is wound up. Example 2:

[0033] refer to Figure 2 The method was optimized based on Example 1. Before coating the integrated OCA optical adhesive layer 8, a polyurethane acrylate primer layer 10 (1-5 μm thick) was first coated on the surface of the second protective layer 5 and then UV cured. This primer layer significantly improved the adhesion between the integrated OCA optical adhesive layer 8 and the second protective layer 5, and no delamination was observed after 1000 hours of high temperature and high humidity testing at 85°C / 85%RH.

[0034] The integration concept of this utility model is not a simple physical lamination, but an integrated structure in which the OCA adhesive layer and the polarizer body (or its protective layer) are chemically or physically bonded through a coating-curing process.

[0035] The key to the success of this invention lies in the selection of the liquid OCA, the curing method, and its compatibility with polarizer protective layers (TAC / PET / COP).

[0036] The interface treatment of this utility model, which introduces a base coating 10, is a preferred technical means to solve the problem of long-term reliability.

[0037] This utility model provides a method for preparing a fully laminated polarizer with an integrated OCA optical adhesive layer, comprising the following steps: Provide polarizing film rolls, which have polarizing film body 4, upper and lower protective layers, pressure-sensitive adhesive layer 6 and lower release film 7. Unroll the roll material, remove the pressure-sensitive adhesive layer 6 and the lower release film 7, and expose the surface of the second protective layer 5 under the pressure-sensitive adhesive layer 6. Liquid OCA optical adhesive is uniformly coated onto the exposed surface of the second protective layer 5 using a coating device. The coated liquid OCA is pre-cured (e.g., by UV pre-irradiation or low-temperature baking) to achieve a certain initial solid state while maintaining high viscosity on the surface. An OCA release film 9 is coated onto the pre-cured integrated OCA optical adhesive layer 8, then wound up and cured to obtain an integrated polarizer product.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fully laminated polarizer with an integrated OCA optical adhesive layer, characterized in that, include: The layers arranged from top to bottom are: upper release film (1), pressure-sensitive adhesive (2), first protective layer (3), polarizer body (4), second protective layer (5), integrated OCA optical adhesive layer (8) and OCA release film (9). The upper release film (1), the first protective layer (3), the polarizer body (4) and the second protective layer (5) are connected in sequence; The integrated OCA optical adhesive layer (8) connects to the OCA release film (9).

2. The fully laminated polarizer with integrated OCA optical adhesive layer according to claim 1, characterized in that: The integrated OCA optical adhesive layer (8) is connected to the second protective layer (5).

3. The fully laminated polarizer with integrated OCA optical adhesive layer according to claim 1, characterized in that: The second protective layer (5) is connected to the integrated OCA optical adhesive layer (8) through the base coating layer (10).

4. The fully laminated polarizer with integrated OCA optical adhesive layer according to claim 3, characterized in that: The thickness of the integrated OCA optical adhesive layer (8) is 25 μm to 200 μm, and its optical refractive index matches the refractive index of the polarizer body (4) and the cover glass / touch screen below, in order to minimize interface reflection.

5. The fully laminated polarizer with integrated OCA optical adhesive layer according to claim 1, characterized in that: The integrated OCA optical adhesive layer (8) is formed by coating the second protective layer (5) with liquid OCA optical adhesive through precision slit coating, scraping or micro-gravure coating, and then UV curing or thermal curing.

6. The fully laminated polarizer with integrated OCA optical adhesive layer according to claim 1, characterized in that: The first protective layer (3) and the second protective layer (5) include optical protective film substrates TAC, PET and COP.

7. The fully laminated polarizer with integrated OCA optical adhesive layer according to claim 1, characterized in that: The polarizer body (4) is made of PVA polarizing film.

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