Composite membrane, backlight module and television

Abstract

The utility model discloses a composite film, a backlight module and a television, the composite film comprises a first prism film and a second prism film which are laminated, the first prism film is provided with a plurality of first prism structures extending along a first direction, and the second prism film is provided with a plurality of second prism structures extending along a second direction; wherein the first direction intersects with the second direction; according to the invention, the influence on visual effect caused by brightness reduction due to addition of an additional diaphragm can be avoided, so that the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a composite film, a backlight module and a television. Background Art

[0002] Composite films such as POP (Prism on Prism, a composite film composed of two layers of prism film) use two layers of prism film with a phase angle difference of 90 degrees. Both layers of prism film can enhance the light gathering effect, so they have excellent brightening effects in both the horizontal and vertical directions. However, since the light is overly concentrated in the center, the viewing angle is reduced, which can be improved by adding a diffusion film on top of the composite film. However, adding an additional film will greatly sacrifice the brightness of the film, affect the visual effect, and increase the cost.

[0003] Therefore, the current technology still needs to be improved and enhanced. Utility Model Content

[0004] The present application provides a composite film, a backlight module and a television, which can avoid adding an additional film to reduce brightness and affect visual effects, thereby reducing costs.

[0005] The present application provides a composite film, comprising a first prism film and a second prism film which are stacked, wherein the first prism film has a plurality of first prism structures extending along a first direction, and the second prism film has a plurality of second prism structures extending along a second direction; wherein the first direction and the second direction intersect.

[0006] In the composite membrane of some embodiments, the angle between the first direction and the second direction is not equal to 90°.

[0007] In the composite film of some embodiments, the first prism film block includes: a first PET layer; a first prism layer, the first prism layer is stacked on the first PET layer, and the first prism layer has a plurality of first prism structures arranged in parallel.

[0008] In the composite film of some embodiments, the first prism layer is rectangular, and the first prism structure is parallel to two opposite sides of the first prism layer.

[0009] In the composite film of some embodiments, the first prism film further includes a first protective layer, and the first protective layer is located on a side away from the first prism layer and is bonded to the first PET layer.

[0010] In the composite film of some embodiments, the second prism film includes: a second PET layer; a second prism layer, wherein the second prism layer is stacked on the second PET layer, and the second prism layer has a plurality of second prism structures arranged in parallel.

[0011] In the composite film of some embodiments, the second prism film further includes a second protective layer, and the second protective layer is located on a side away from the second prism layer and is bonded to the second PET layer.

[0012] In the composite film of some embodiments, the interval between the tops of two adjacent first prism structures is 6 um to 200 um.

[0013] The embodiment of the present application further provides a backlight module, which includes the above-mentioned POP film.

[0014] An embodiment of the present application further provides a television set, which includes the above-mentioned backlight module, and the first prism structure or the second prism structure is parallel to the frame of the television set.

[0015] Composite film The present application provides a composite film and a backlight module, wherein the composite film includes a first prism film and a second prism film which are stacked, wherein the first prism film has a plurality of first prism structures extending along a first direction, and the second prism film has a plurality of second prism structures extending along a second direction; wherein the first direction and the second direction intersect at an angle of 0.5°, and by arranging the first prism structure and the second prism structure located in two intersecting directions, the problem of reducing brightness and affecting visual effects due to the addition of additional films can be avoided, and the cost of arranging additional films can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the composite membrane provided in the embodiments of the present application.

[0018] Figure 2 This is a schematic cross-sectional view of the first embodiment of the composite membrane provided in the embodiments of the present application.

[0019] Figure 3 A schematic diagram of the angle between the first prism structure and the second prism structure in the first embodiment of the composite membrane provided in an embodiment of the present application.

[0020] Figure 4 A schematic diagram of the three-dimensional structure of a second embodiment of the composite diaphragm provided in an embodiment of the present application.

[0021] Figure 5 A schematic diagram of the angle between the first prism structure and the second prism structure in the second embodiment of the composite membrane provided in an embodiment of the present application.

[0022] Reference numerals:

[0023] 10. a first prism film; 20. a second prism film;

[0024] 121, first prism structure; 221, second prism structure;

[0025] 11. First PET layer; 12. First prism layer; 13. First protective layer; 21. Second PET layer; 22. Second prism layer; 23. Second protective layer. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. The features specified as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] See also Figure 1 , Figure 2 and Figure 3 The present embodiment provides a backlight module, which includes a composite film, and the composite film includes a first prism film 10 and a second prism film 20 which are stacked; wherein the first prism film 10 is a relative lower prism film, and the second prism film 20 is a relative upper prism film.

[0029] Specifically, the first prism film 10 has a plurality of first prism structures 121 extending along the first direction, and the second prism film 20 has a plurality of second prism structures 221 extending along the second direction; wherein the first direction and the second direction intersect, and the angle between the first direction and the second direction is ɑ; in the present application, by setting the first prism structure and the second prism structure located in two intersecting directions, the problem of reducing the brightness and thus affecting the visual effect due to the addition of additional diaphragms can be avoided, and the cost of setting additional diaphragms can be reduced. At the same time, the setting of additional film layers is reduced, which can be conducive to the light and thin design of the backlight module.

[0030] In some embodiments, when the backlight module is used in a television, the first prism structure or the second prism structure in the composite film is parallel to the frame of the television. For example, the first prism structure 121 is kept parallel to the frame of the television so that the composite film can replace the diffusion film to achieve a better visual effect, thereby avoiding the reduction of brightness caused by adding an additional film to reduce costs.

[0031] As an embodiment, the first prism structure 121 may be parallel to the bottom frame of the frame.

[0032] In some embodiments, the angle between the first direction and the second direction is not equal to 90°, that is, the first direction in this embodiment intersects with the second direction and is not perpendicular. This can effectively alleviate the problem of excessive concentration of light, which reduces the viewing angle and affects the visual effect when the angle between the first prism structure 121 and the second prism structure 221 is set to 90°.

[0033] As an embodiment, the angle range between the first direction and the second direction can be [65°, 90°) and (90°-135°). Figure 3 As shown, the angle ɑ between the first direction and the second direction is 65°; Figure 4 and Figure 5 As shown, the angle ɑ at which the first direction and the second direction intersect is 135°. In this embodiment, by arranging the first prism structure 121 and the second prism structure 221 located in two intersecting directions, and arranging the first prism structure 121 parallel to the frame of the TV when arranging the backlight module, the composite film replaces the diffusion film, reduces the use of the diffusion film, and reduces the cost while ensuring the visual effect.

[0034] Please continue reading Figure 1 and Figure 2 In some embodiments, the first prism film 10 includes a first PET layer 11 and a first prism layer 12. The first prism layer 12 is stacked on the first PET layer 11, and the first prism layer 12 has a plurality of first prism structures 121 arranged in parallel. In this embodiment, the first prism layer 12 is a glue layer, and the glue used in the glue layer can be acrylic glue, and the refractive index of the glue is selected between 1.52 and 1.56.

[0035] As an embodiment, the first prism film 10 further includes a first protective layer 13, which is located on a side away from the first prism layer 12 and adhered to the first PET layer 11. The first protective layer 13 in this embodiment is also a glue layer, and the glue used in the glue layer may also be acrylic glue. Unlike the first prism layer 12, the glue in the first protective layer 13 contains PMMA or PBMA particles, ensuring that the first protective layer 13 has a certain haze, such as a haze of 20%-40%, so as to ensure the overall visual effect of the composite film. At the same time, by providing the first protective layer 13, scratches can be prevented to play a protective role.

[0036] In some embodiments, the second prism film 20 includes a second PET layer 21 and a second prism layer 22, the second prism layer 22 is stacked on the second PET layer 21, and the second prism layer 22 has a plurality of parallel second prism structures 221. The second prism layer 22 in this embodiment is a glue layer, and the glue used in the glue layer can be acrylic glue, and the refractive index of the glue is selected between 1.52 and 1.56.

[0037] As an embodiment, the second prism film 20 further includes a second protective layer 23, which is located on a side away from the second prism layer 22 and adhered to the second PET layer 21. The second protective layer 23 in this embodiment is also a glue layer, and the glue used in the glue layer may also be acrylic glue. Unlike the second prism layer 22, the glue in the second protective layer 23 contains PMMA or PBMA particles, ensuring that the second protective layer 23 has a certain haze, such as a haze of 30%-40%, so as to ensure the overall visual effect of the composite film. At the same time, the second protective layer 23 can be provided to prevent scratches, thereby playing a protective role.

[0038] As an embodiment, the first prism layer 12 is rectangular, and the first prism structure 121 is parallel to the opposite sides of the first prism layer 12, that is, the first prism structure 121 in this embodiment is arranged parallel to the side of the entire rectangular first prism layer 12. Because there is a certain angle ɑ between the two directions where the first prism structure 121 and the second prism structure 221 are located, the second prism structure 221 is arranged obliquely relative to the side of the second prism layer 22.

[0039] As an embodiment, the interval between the tops of two adjacent first prism structures 121 is 6um to 200um, that is, the prism period Pitch value in the first prism film 10 is 6um to 200um. The interval between the tops of two adjacent second prism structures 221 is 50um to 150um, that is, the prism period Pitch value in the second prism film 20 is 50um to 150um. In this embodiment, by setting different Pitch values ​​in the two layers of prism films, the uniform light effect can be improved while ensuring the overall brightness, thereby improving the overall visual effect.

[0040] The preparation process of the composite film in this embodiment is as follows: first, a back-coated glue of thermosetting acrylic resin is applied on one side of the first PET layer 11, the glue contains PMMA or PBMA particles, and the glue haze is designed to be 20%-40%; then, acrylic glue is applied on the other side of the first PET layer 11, and the refractive index of the glue is selected between 1.52 and 1.56; then, a copper roller with a prism structure is used to emboss the other side of the first PET layer 11 to obtain a first prism structure 121 to form a first prism layer 12; the prism period Pitch in the first prism layer 12 is 6um to 200um. A second protective layer 23 is formed by thermosetting acrylic glue on one side of the second PET layer 21, wherein the glue contains PMMA or PBMA particles, and the glue haze is designed to be 30%-40%; the second PET layer 21 coated with the second protective layer 23 is laminated to the first prism film 10, acrylic glue is coated on the other side of the second PET layer 21, and a copper roller with a prism structure is used to emboss the other side of the second PET layer 21 to obtain a second prism structure 221 to form a second prism layer 22, and the prism period Pitch in the second prism layer 22 is 50um to 150um.

[0041] The embodiment of the present application also provides a composite film, which includes a first prism film 10 and a second prism film 20 which are stacked, wherein the first prism film 10 has a plurality of first prism structures 121 extending along a first direction, and the second prism film 20 has a plurality of second prism structures 221 extending along a second direction; wherein the first direction and the second direction intersect; in this embodiment, by arranging the first prism structure and the second prism structure located in two intersecting directions, the problem of reducing the brightness and affecting the visual effect due to the addition of additional films can be avoided, and the cost of setting up additional films can be reduced. At the same time, the reduction of the setting of additional film layers can be conducive to the light and thin design of the backlight module. Since the composite film is described in detail above, it will not be repeated here.

[0042] The embodiment of the present application further provides a television set, which includes the above-mentioned backlight module. Since the backlight module is described in detail above, it will not be described again here.

[0043] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0044] The composite diaphragm provided in the embodiments of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A composite diaphragm, characterized in that: It comprises a first prism film and a second prism film which are stacked, wherein the first prism film has a plurality of first prism structures extending along a first direction, and the second prism film has a plurality of second prism structures extending along a second direction; wherein the first direction and the second direction intersect.

2. The composite membrane according to claim 1, characterized in that: The angle between the first direction and the second direction is not equal to 90°.

3. The composite diaphragm according to claim 1, characterized in that: The first prism film comprises: First PET layer; The first prism layer is stacked on the first PET layer, and the first prism layer has a plurality of the first prism structures arranged in parallel.

4. The composite membrane according to claim 3, characterized in that: The first prism layer is rectangular, and the first prism structure is parallel to two opposite sides of the first prism layer.

5. The composite diaphragm according to claim 3, characterized in that: The first prism film further includes a first protective layer, which is located on a side away from the first prism layer and adheres to the first PET layer.

6. The composite membrane according to claim 5, characterized in that: The second prism film comprises: Second PET layer; The second prism layer is stacked on the second PET layer, and the second prism layer has a plurality of second prism structures arranged in parallel.

7. The composite membrane according to claim 6, characterized in that: The second prism film further includes a second protective layer, which is located on a side away from the second prism layer and adheres to the second PET layer.

8. The composite membrane according to any one of claims 1 to 7, characterized in that: The interval between the tops of two adjacent first prism structures is 6 um to 200 um.

9. A backlight module, characterized in that: The backlight module comprises the composite film according to any one of claims 1 to 8.

10. A television set, characterized in that: The television set comprises: The backlight module as claimed in claim 9; Wherein, the first prism structure or the second prism structure is parallel to the frame of the television.

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