A polarizing plate for improving shrinkage brightening

Abstract

The utility model discloses an improve shrinkage brightening type polarizer, set up HC coating component, including: absorption type polarizer component, the upper side of HC coating component is attached to, and HC coating component and absorption type polarizer component between bonding connection has first pressure sensitive adhesive, and HC coating component and absorption type polarizer component are attached to make. The improve shrinkage brightening type polarizer, through the adjustment HC layer and the shrinkage rate consistency of brightening film, when brightening film shrinks, HC layer follows shrinkage, can prevent the interlayer tension of two layers of materials when shrinking, prevent the phenomenon that brightening film and HC layer delamination or HC layer is pulled apart and the deformation of brightening film.

Description

Technical Field

[0001] This utility model relates to the field of polarizer technology, specifically to an improved shrinkage-enhancing polarizer. Background Technology

[0002] TFT-LCDs are widely used in various display fields. As the display industry develops, the requirements for brightness are getting higher and higher, requiring the use of brightness enhancement films to improve brightness. However, during use, there are inconsistencies between environmental simulation reliability and material shrinkage.

[0003] To overcome the aforementioned shortcomings, existing technology (Chinese patent application CN202223297623.9, filed on 2022-12-09) uses a reflective brightening polarizer. The V-cut type focusing layer reflects light to generate refracted light, enhancing the effect when the light-emitting part in the brightening film emits light. The light then strikes the V-cut type focusing layer, resulting in refracted light and a more uniform and brighter light transmission effect. This achieves the functions of focusing light and increasing brightness, with higher light utilization and better enhancement effect. While existing technology can be used for brightening, during operation, the brightening film is in direct contact with the backlight, making it susceptible to the influence of the backlight's microstructure. This can lead to punctures at the contact points, resulting in display defects.

[0004] To address the aforementioned issues, there is an urgent need for innovative designs based on existing polarizers. Utility Model Content

[0005] The purpose of this invention is to provide an improved shrinkage-enhancing polarizer to solve the problem mentioned in the background art where, during operation, the brightening polarizer is in direct contact with the backlight and is easily affected by the backlight microstructure, resulting in puncture at the contact point and thus poor display.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an improved shrinkage-enhancing polarizer, comprising an HC coating assembly; including an absorptive polarizer assembly, which is attached to the upper side of the HC coating assembly, and a first pressure-sensitive adhesive is bonded between the HC coating assembly and the absorptive polarizer assembly, and the HC coating assembly and the absorptive polarizer assembly are bonded together.

[0007] Preferably, the HC coating assembly further includes a protective film, an HC layer, and a brightening film, wherein the HC layer is attached to the upper surface of the protective film, the brightening film is attached to the upper surface of the HC layer, and another set of protective films is attached to the upper surface of the brightening film.

[0008] Preferably, the HC layer and the brightening film form a cured structure, and the brightening film and another set of protective films form a protective structure, and the shrinkage rate curve of the brightening film is consistent with that of the HC layer, with a shrinkage rate ≤1%.

[0009] Preferably, the brightening film structure is a multilayer film structure, the birefringent layer is made of polyethylene naphthalate and polyethylene terephthalate monomers, and the HC layer has a thickness of 5-15 μm and a haze of <2%.

[0010] Preferably, the absorptive polarizer assembly further includes a polyvinyl alcohol film, a cellulose triacetate film, a second pressure-sensitive adhesive, and a release film. A protective film is attached to the lower surface of the polyvinyl alcohol film, and a cellulose triacetate film is attached to the upper surface of the polyvinyl alcohol film. The second pressure-sensitive adhesive is bonded to the upper surface of the cellulose triacetate film, and a release film is attached to the upper surface of the second pressure-sensitive adhesive.

[0011] Preferably, the absorptive polarizer assembly is bonded to the HC coating assembly via a first pressure-sensitive adhesive, and the polyvinyl alcohol film and the cellulose triacetate film are bonded together.

[0012] Preferably, the cellulose triacetate membrane is bonded to the release film via a second pressure-sensitive adhesive.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This improved shrinkage-enhancing polarizer adjusts the consistency of the shrinkage rate of the HC layer and the brightness enhancement film. When the brightness enhancement film shrinks, the HC layer shrinks as well. This effectively prevents interlayer tension between the two layers during shrinkage, thus preventing delamination of the brightness enhancement film and HC layer, or tearing and deformation of the HC layer by the brightness enhancement film.

[0014] 2. The improved shrinkage and brightening polarizer is formed by bonding a transparent first pressure-sensitive adhesive to the non-HC layer of the brightening film, and then bonding it perpendicularly to the non-adhesive surface of the absorption polarizer assembly.

[0015] 3. This improved shrinkage-enhancing polarizer is composed of a HC coating assembly and an absorption polarizer assembly in separate steps, which can effectively improve the stability of the assembly. In addition, with the protective film at different positions, the safety of subsequent bonding can be improved when the individual steps are made. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional bonding structure of the improved shrinkage and brightness-enhancing polarizer of this utility model; Figure 2 This is a partial cross-sectional three-dimensional structural diagram of the improved shrinkage and brightness-enhancing polarizer of this utility model; Figure 3 This is a schematic diagram of the unfolded three-dimensional structure of the improved shrink-brightness polarizer of this utility model; Figure 4 This is a three-dimensional structural diagram of the HC coating component of this utility model; Figure 5 This is a three-dimensional structural diagram of the absorptive polarizer assembly of this utility model; Figure 6 This is a three-dimensional structural diagram of the absorption-type polarizer assembly of this utility model.

[0017] In the figure: 1. HC coating assembly; 2. Absorption polarizer assembly; 3. Protective film; 4. HC layer; 5. Brightening film; 6. First pressure-sensitive adhesive; 7. Polyvinyl alcohol film; 8. Cellulose triacetate film; 9. Second pressure-sensitive adhesive; 10. Release film. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-6 The present invention provides the following technical solution: an improved shrinkage and brightening polarizer, comprising an HC coating assembly 1.

[0020] Example 1: As Figures 1-6 The present invention provides the following technical solution: a reflective polarizer with improved reflectivity, comprising: an absorptive polarizer assembly 2, which is attached to the upper side of an HC coating assembly 1, and a first pressure-sensitive adhesive 6 is bonded between the HC coating assembly 1 and the absorptive polarizer assembly 2, and the HC coating assembly 1 and the absorptive polarizer assembly 2 are bonded together.

[0021] In use, the HC coating component 1 and the absorptive polarizer component 2 are produced separately. The first pressure-sensitive adhesive 6 is bonded to the lower surface of the absorptive polarizer component 2, and the HC coating component 1 is bonded to the lower side of the first pressure-sensitive adhesive 6. This promotes the preparation and molding of the shrinkage-enhancing polarizer, thereby controlling and improving the preparation stability of the shrinkage-enhancing polarizer.

[0022] The improved method for preparing shrink-brightness-enhancing polarizers comprises the following steps: The surface of the brightening film 5 is coated with HC. The requirements for HC layer 4 are: the shrinkage rate trend is consistent with that of the brightening film; the shrinkage rate control range of the coating and the brightening film 5 is: ≤1% at 85℃ & 240h; the coating thickness of HC layer 4 is 5-15μm; and the haze is <2%. Judgment criteria: no abnormal appearance on the surface at 85℃*85%RH*240h.

[0023] Fabrication of Absorption-type Polarizing Film Assembly 2: After the polyvinyl alcohol film 7 is swollen, it is directly dyed, then stretched, fixed, and dried, and then laminated with the triacetate cellulose film 8 to form the original polarizing film. Finally, a transparent second pressure-sensitive adhesive 9 is coated on the surface of the triacetate cellulose film 8. The dyeing uses an aqueous solution containing iodine / potassium iodide or other dyeing solutions with dichroism. Boric acid, zinc chloride, etc. can be used for fixing as needed. The structure of the absorption-type polarizing film assembly 2 can also be customized according to customer requirements by attaching the triacetate cellulose film 8 to the other side of the polyvinyl alcohol film 7 to form a sandwich structure of double triacetate cellulose film 8.

[0024] Brightness-enhancing polarizer fabrication: Brightness-enhancing film 5 is coated with transparent first pressure-sensitive adhesive 6, and then perpendicularly bonded to absorption-type polarizer assembly 2.

[0025] Example 2: Figure 1 and- Figure 4 The technical solution shown, based on Embodiment 1, further discloses the molding of the HC coating assembly 1, solving the appearance problem of inconsistent material shrinkage after environmental simulation reliability. The specific details are as follows: The HC coating assembly 1 also includes a protective film 3, an HC layer 4, and a brightening film 5. The upper surface of the protective film 3 is bonded to the HC layer 4, and the upper surface of the HC layer 4 is bonded to the brightening film 5. Simultaneously, another set of protective films 3 is bonded to the upper surface of the brightening film 5. Please refer to... Figure 2 and Figure 3 and Figure 4 The HC layer 4 and the brightness enhancement film 5 form a cured structure, and the brightness enhancement film 5 and another set of protective films 3 form a protective structure. Furthermore, the shrinkage rate curve of the brightness enhancement film 5 follows the same trend as that of the HC layer 4, with a shrinkage rate ≤1%. Please refer to [link / reference]. Figure 3 and Figure 4 The brightening film 5 has a multilayer structure. The birefringent layer is made of polyethylene naphthalate and polyethylene terephthalate monomers, and the HC layer 4 has a thickness of 5-15μm and a haze of <2%.

[0026] In use, an HC layer 4 is added to the surface of the brightening film 5, which can effectively control the shrinkage rate between the protective film 3 and the HC layer 4 within an appropriate range. The protective film 3 is then attached to the outer surfaces of the HC layer 4 and the brightening film 5 respectively, thereby effectively forming the HC coating assembly 1.

[0027] Example 3: Figure 2 , Figure 5 and Figure 6The technical solution shown, based on Embodiment 2, further discloses the molding of the absorptive polarizer assembly 2, solving the problem that the brightening film, which is in direct contact with the backlight, is easily affected by the backlight microstructure, resulting in puncture at the contact point and thus causing display defects. The specific details are as follows: The absorptive polarizer assembly 2 also includes a polyvinyl alcohol film 7, a cellulose triacetate film 8, a second pressure-sensitive adhesive 9, and a release film 10. A protective film 3 is bonded to the lower surface of the polyvinyl alcohol film 7, and a cellulose triacetate film 8 is bonded to the upper surface of the polyvinyl alcohol film 7. Simultaneously, the second pressure-sensitive adhesive 9 is bonded to the upper surface of the cellulose triacetate film 8, and a release film 10 is bonded to the upper surface of the second pressure-sensitive adhesive 9. Please refer to [link to relevant documentation]. Figure 5 and Figure 6 The absorptive polarizer assembly 2 is bonded to the HC coating assembly 1 via the first pressure-sensitive adhesive 6, and the polyvinyl alcohol film 7 is bonded to the cellulose triacetate film 8; please refer to Figure 5 and Figure 6 The triacetate cellulose membrane 8 is bonded to the release membrane 10 via the second pressure-sensitive adhesive 9.

[0028] In use, a protective film 3 is attached to the lower surface of the polyvinyl alcohol film 7, and a triacetate cellulose film 8 is attached to the upper surface of the polyvinyl alcohol film 7, so that the polyvinyl alcohol film 7 and the triacetate cellulose film 8 are composited to form the original light film. A second pressure-sensitive adhesive 9 is then bonded to the upper surface of the triacetate cellulose film 8, thereby simultaneously bonding a release film 10 to the upper side of the second pressure-sensitive adhesive 9, thus forming an absorption polarizer assembly 2. After the HC coating assembly 1 and the absorption polarizer assembly 2 are prepared in separate steps, the protective film 3 on the lower side of the polyvinyl alcohol film 7 and the protective film 3 on the outer side of the brightening film 5 are removed. A first pressure-sensitive adhesive 6 is then added between the brightening film 5 and the polyvinyl alcohol film 7, thereby producing a shrinkage-improving brightening polarizer and improving the preparation stability.

[0029] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An improved shrinkage-enhancing polarizer, comprising an HC coating assembly (1); Its features are, include: An absorptive polarizer assembly (2) is attached to the upper side of the HC coating assembly (1), and a first pressure-sensitive adhesive (6) is bonded between the HC coating assembly (1) and the absorptive polarizer assembly (2), and the HC coating assembly (1) and the absorptive polarizer assembly (2) are bonded together. The HC coating assembly (1) further includes a protective film (3), an HC layer (4) and a brightening film (5), and the upper surface of the protective film (3) is attached to the HC layer (4), and the upper surface of the HC layer (4) is attached to the brightening film (5), while the upper surface of the brightening film (5) is attached to another set of protective films (3). The HC layer (4) and the brightening film (5) form a cured structure, and the brightening film (5) and another set of protective films (3) form a protective structure. The shrinkage rate of the brightening film (5) is consistent with the shrinkage rate curve of the HC layer (4), and the shrinkage rate is ≤1%.

2. The improved shrinkage and brightness-enhancing polarizer according to claim 1, characterized in that: The brightening film (5) has a multilayer structure. The birefringent layer is made of polyethylene naphthalate and polyethylene terephthalate monomers, and the HC layer (4) has a thickness of 5-15 μm and a haze of <2%.

3. The improved shrinkage and brightness-enhancing polarizer according to claim 2, characterized in that: The absorptive polarizer assembly (2) further includes a polyvinyl alcohol film (7), a cellulose triacetate film (8), a second pressure-sensitive adhesive (9), and a release film (10). A protective film (3) is attached to the lower surface of the polyvinyl alcohol film (7), and a cellulose triacetate film (8) is attached to the upper surface of the polyvinyl alcohol film (7). At the same time, a second pressure-sensitive adhesive (9) is bonded to the upper surface of the cellulose triacetate film (8), and a release film (10) is attached to the upper surface of the second pressure-sensitive adhesive (9).

4. The improved shrinkage and brightness-enhancing polarizer according to claim 3, characterized in that: The absorptive polarizer assembly (2) is bonded to the HC coating assembly (1) by the first pressure-sensitive adhesive (6), and the polyvinyl alcohol film (7) is bonded to the cellulose triacetate film (8).

5. The improved shrinkage and brightness-enhancing polarizer according to claim 4, characterized in that: The triacetate cellulose membrane (8) is bonded to the release membrane (10) by a second pressure-sensitive adhesive (9).

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