CN216526646U - Optical film, backlight module and display device - Google Patents
Optical film, backlight module and display device Download PDFInfo
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- CN216526646U CN216526646U CN202220040302.1U CN202220040302U CN216526646U CN 216526646 U CN216526646 U CN 216526646U CN 202220040302 U CN202220040302 U CN 202220040302U CN 216526646 U CN216526646 U CN 216526646U
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Abstract
The utility model provides an optics diaphragm, backlight unit and display device belongs to the display device field. The optical film comprises a prism sheet, a polaroid and a connecting layer; the prism sheet and the polaroid are oppositely arranged, and the edge of the prism sheet is connected with the edge of the polaroid through the connecting layer; the surface of the polaroid, which is close to the prism sheet, is distributed with a plurality of particles, and in the process of recovering the atmospheric pressure after the film coating is finished, air can enter between the prism sheet and the polaroid through gaps among the particles, so that the speed of separating the prism sheet and the polaroid is accelerated, and the phenomenon of snowflake appearing on a display picture is quickly eliminated. Because the speed of separating the prism sheet and the polaroid is accelerated, the possibility of damaging the prism sheet is reduced, and the influence on the display effect of the display device is avoided.
Description
Technical Field
The disclosure relates to the field of display devices, in particular to an optical film, a backlight module and a display device.
Background
The liquid crystal display device is adopted in some terminal equipment such as mobile phones and tablet computers, the backlight module is an important structure in the liquid crystal display device, and the quality of the backlight module has a great influence on the display effect of the liquid crystal display device.
The backlight module generally includes a light source, a light guide plate, and an optical film, where the optical film is located on a light emitting side of the light guide plate and mainly plays a role of light uniformization. The optical film generally includes a prism sheet and a polarizer, which are connected at an edge position.
In order to improve the waterproof rating of the terminal equipment, the terminal equipment is usually coated with a film. The coating process is generally performed in vacuum. After the film coating is finished, the atmospheric pressure is restored, the prism sheet and the polarizer sheet are pressed together under the action of the atmospheric pressure, and the process of air entering between the prism sheet and the polarizer sheet is very slow, so that the prism sheet and the polarizer sheet can be separated after a long time. The attachment of the prism sheet and the polarizer may cause snowflakes on the display screen of the display device, and even if the prism sheet and the polarizer are separated, the long-term attachment may damage the prism sheet and may also affect the display effect of the display device.
SUMMERY OF THE UTILITY MODEL
The embodiment of the disclosure provides an optical film, a backlight module and a display device, which can accelerate the separation of a prism sheet and a polarizer. The technical scheme is as follows:
in one aspect, embodiments of the present disclosure provide an optical film, which includes a prism sheet, a polarizer, and a connection layer;
the prism sheet and the polaroid are oppositely arranged, and the edge of the prism sheet is connected with the edge of the polaroid through the connecting layer;
a plurality of particles are distributed on the surface of the polarizer, which is close to the prism sheet.
In a possible implementation manner of the embodiment of the present disclosure, a plurality of the particles are distributed in an area surrounded by the connection layer.
In a possible implementation manner of the embodiment of the present disclosure, a surface of the polarizer, which is close to the prism sheet, has at least one particle distribution area, the at least one particle distribution area is located in a middle portion of the polarizer, and the particles are located in the particle distribution area.
In one possible implementation of the embodiment of the present disclosure, a plurality of the particles are uniformly distributed in the particle distribution area.
In one possible implementation of the disclosed embodiments, the particles have a diameter of 0.1 μm to 100 μm.
Optionally, the particles are made of a polymeric transparent material.
In a possible implementation manner of the embodiment of the present disclosure, the prism sheet includes a substrate layer and a plurality of prism structures, and the plurality of prism structures are located on one surface of the substrate layer close to the polarizer and are distributed in an area surrounded by the connection layer.
In one possible implementation of the embodiments of the present disclosure, the cross section of the prism structure is trapezoidal.
On the other hand, the embodiment of the present disclosure further provides a backlight module, which includes a light guide plate and the optical film as described in the previous aspect, wherein the optical film is located on the light exit side of the light guide plate, and the prism sheet is close to the light guide plate.
In another aspect, an embodiment of the present disclosure further provides a display device, which includes the backlight module according to the foregoing aspect.
The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:
the plurality of particles are arranged on the surface, close to the prism sheet, of the polarizer, and in the process of recovering the atmospheric pressure after the film coating is finished, air can enter between the prism sheet and the polarizer through gaps among the particles, so that the separation speed of the prism sheet and the polarizer is increased, and the phenomenon that snowflakes appear on a display picture is quickly eliminated. Because the speed of separating the prism sheet and the polaroid is accelerated, the possibility of damaging the prism sheet is reduced, and the influence on the display effect of the display device is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of an optical film of the related art;
FIG. 2 is a schematic structural diagram of an optical film provided by an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a polarizer according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a backlight module according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.
Fig. 1 is a schematic structural diagram of an optical film in the related art. As shown in fig. 1, the optical film includes a prism sheet 10 and a polarizer 20. The prism sheet 10 and the polarizer 20 are oppositely arranged, and the edge of the prism sheet 10 and the edge of the polarizer 20 are connected through a light shielding adhesive. A certain gap is provided between the prism sheet 10 and the polarizer 20. When the terminal device is finished with a coating process and the atmospheric pressure is restored, the prism sheet 10 and the polarizer 20 will be pressed against each other under the action of the atmospheric pressure, and at this time, if the display device of the terminal device is turned on, the displayed image may have a snowflake phenomenon. After a long time, air gradually enters between the prism sheet 10 and the polarizer 20, so that the pressure is gradually balanced, and the prism sheet 10 and the polarizer 20 may be separated, so that the snowflake phenomenon disappears. However, the long-term adhesion between the prism sheet 10 and the polarizer 20 may cause the prism structure on the surface of the prism sheet 10 to be damaged and deformed, which affects the display effect of the display device.
Fig. 2 is a schematic structural diagram of an optical film provided in an embodiment of the present disclosure. As shown in fig. 2, the optical film includes a prism sheet 10, a polarizer 20, and a connection layer 30.
The prism sheet 10 is disposed opposite to the polarizer 20, and an edge of the prism sheet 10 is connected to an edge of the polarizer 20 through a connection layer 30.
The surface of the polarizer 20 near the prism sheet 10 is distributed with a plurality of particles 40.
The plurality of particles are arranged on the surface, close to the prism sheet, of the polarizer, and in the process of recovering the atmospheric pressure after the film coating is finished, air can enter between the prism sheet and the polarizer through gaps among the particles, so that the separation speed of the prism sheet and the polarizer is increased, and the phenomenon that snowflakes appear on a display picture is quickly eliminated. Because the speed of separating the prism sheet and the polaroid is accelerated, the possibility of damaging the prism sheet is reduced, and the influence on the display effect of the display device is avoided.
As shown in fig. 2, a plurality of particles 40 are distributed in the region surrounded by the connection layer 30.
The particles 40 are prevented from being arranged at the position of the connection layer 30 to improve the sealing property at the connection of the connection layer 30 and the polarizer 20, and prevent moisture from entering between the polarizer 20 and the prism sheet 10 from the connection layer 30.
The connection layer 30 may be an adhesive to bond the prism sheet 10 and the polarizer 20 together. The connection layer 30 may be an opaque structure to shield the edge region of the optical film from light. The connection layer 30 is connected to the prism sheet 10 and the polarizer 20, respectively, to provide a certain sealing property and prevent water vapor from entering between the prism sheet 10 and the polarizer 20. Although the sealing is performed through the connection layer 30, air between the prism sheet 10 and the polarizer 20 is drawn out during the vacuum process during the coating, and air gradually enters between the prism sheet 10 and the polarizer 20 through the connection layer 30 during the process of restoring the atmospheric pressure.
Fig. 3 is a schematic structural diagram of a polarizer according to an embodiment of the present disclosure. As shown in fig. 3, the surface of the polarizer 20 adjacent to the prism sheet 10 has a particle distribution region 20a, the particle distribution region 20a is located in the middle of the polarizer 20, and the particles 40 are located in the particle distribution region 20 a.
The connection layer 30 supports the prism sheet 10 and the polarizer 20 at the edge of the optical film. When the prism sheet 10 is attached to the polarizer 20, the attached portion is usually in the middle of the optical film, and even though the prism sheet 10 is attached to the polarizer 20 in the middle of the optical film, there is usually a certain gap between the prism sheet 10 and the polarizer 20 at the edge position near the connection layer 30. The particle distribution region 20a is disposed at the center of the polarizer 20 and the prism sheet 10 are spaced apart from each other, so that the center of the polarizer 20 and the prism sheet 10 are more rapidly separated during the restoration of atmospheric pressure after the completion of coating.
In other examples, there may be a plurality of particle distribution regions 20a, and the plurality of particle distribution regions 20a are all located in the region surrounded by the connection layer 30.
Alternatively, the plurality of particles 40 are uniformly distributed in the particle distribution region 20 a. Uniform gaps are formed between the plurality of particles 40 to allow air to rapidly enter various positions of the particle distribution region 20a, accelerating the separation of the prism sheet 10 and the polarizer 20. In addition, the particles 40 are uniformly distributed, so that the phenomenon that the display effect of the display device is influenced by the difference of the brightness and the like of the backlight module due to the overlarge density difference of the distribution of the particles 40 in different areas can be avoided.
Alternatively, the particles 40 have a diameter of 0.1 μm to 100 μm.
The diameter of the particles 40 is set at the micron level, so that the situation that the diameter of the particles 40 is too small and air cannot rapidly enter between the prism sheet 10 and the polarizer 20 is avoided, and the situation that the diameter of the particles 40 is too large to influence the brightness uniformity of the backlight module is also avoided.
In addition, the uniformly distributed particles 40 of multiple micrometers can also play a role of uniform light, which is beneficial to reducing the defects of white spots, white spots and the like of the backlight module caused by local uneven brightness.
Optionally, the particles 40 are made of a polymeric transparent material.
The particles 40 are made of transparent materials, so that the absorption of the particles 40 to light is reduced, and the influence of the particles 40 on the brightness of the backlight module is reduced.
Illustratively, the particles 40 are made of PMMA (polymethyl methacrylate), which not only has high transparency, but also is hard and not easily scratched or deformed.
As shown in fig. 2, the polarizer 20 includes a first support layer 21, a functional layer 22, a second support layer 23, and an adhesive layer 24, which are sequentially stacked. The adhesive layer 24 is used for adhesion of the polarizer 20 to a display panel or other structure. Illustratively, the adhesive layer 24 may be a pressure sensitive adhesive. The particles 40 are distributed on the surface of the first support layer 21 remote from the functional layer 22.
In some examples, the particles 40 may be formed on the surface of the first support layer 21 of the polarizer 20 by coating. For example, particles 40 may be suspended and then applied to the surface of first support layer 21 of polarizer 20, and the liquid portion may be removed, for example, by drying or natural evaporation.
As shown in fig. 2, the prism sheet 10 includes a substrate layer 11 and a plurality of prism structures 12.
Illustratively, the substrate layer 11 may be a film of PET (polyethylene terephthalate). The prismatic structures 12 may be made of UV glue.
The prism structures 12 are located on one surface of the substrate layer 11 close to the polarizer 20, and the prism structures 12 are distributed in an area surrounded by the connection layer 30.
The prism structure 12 of the prism sheet 10 enables more light to be emitted to the polarizer 20 in a vertical or approximately vertical direction, so as to increase the brightness of the backlight module, thereby improving the display brightness of the display device. The prism structures 12 are arranged in the area surrounded by the connection layer 30, so that the prism structures 12 are prevented from affecting the sealing performance of the joint of the prism sheet 10 and the polarizer 20, and water vapor is prevented from entering between the prism sheet 10 and the polarizer 20.
As shown in fig. 2, the prismatic structure 12 is trapezoidal in cross-section.
In the related art, the cross section of the prism structure 12 of the prism sheet 10 is generally triangular, and under the action of atmospheric pressure, in the process of attaching the prism sheet 10 and the polarizer 20 together, the prism structure 12 may be deformed, which results in poor performance, thereby reducing the effect of the prism sheet 10 on improving brightness. In the embodiment of the present disclosure, the cross section of the prism structure 12 is trapezoidal, and the top of the prism structure 12 opposite to the polarizer 20 is a surface, not an edge. When the prism sheet 10 and the polarizer 20 are attached together, the prism structure 12 and the polarizer 20 form a surface contact, and the prism structure 12 is not easy to deform, thereby preventing the performance of the prism sheet 10 from being deteriorated.
Fig. 4 is a schematic structural diagram of a backlight module according to an embodiment of the disclosure. As shown in fig. 4, the backlight assembly includes a light guide plate 50 and an optical film as shown in fig. 2. The optical film is located on the light-emitting side of the light guide plate 50, and the prism sheet 10 is close to the light guide plate 50.
The plurality of particles are arranged on the surface, close to the prism sheet, of the polarizer, and in the process of recovering the atmospheric pressure after the film coating is finished, air can enter between the prism sheet and the polarizer through gaps among the particles, so that the separation speed of the prism sheet and the polarizer is increased, and the phenomenon that snowflakes appear on a display picture is quickly eliminated. Because the speed of separating the prism sheet and the polaroid is accelerated, the possibility of damaging the prism sheet is reduced, and the influence on the display effect of the display device is avoided. The uniformly distributed particles with a plurality of micron levels can also play a certain role of light uniformization, and are beneficial to weakening the defects of white spots, white spots and the like of the backlight module caused by uneven local brightness.
The backlight module further includes a backlight source, in some examples, a direct-type backlight module, where the backlight source is located on a side of the light guide plate 50 away from the optical film. In other examples, the backlight module is a side-in type backlight module, and the backlight source is located at a side of the light guide plate 50.
The embodiment of the present disclosure further provides a display device, which is a liquid crystal display device and includes the backlight module shown in fig. 4.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. An optical film is characterized by comprising a prism sheet (10), a polarizer (20) and a connecting layer (30);
the prism sheet (10) is arranged opposite to the polarizer (20), and the edge of the prism sheet (10) is connected with the edge of the polarizer (20) through the connecting layer (30);
a plurality of particles (40) are distributed on the surface of the polarizer (20) close to the prism sheet (10).
2. Optical film according to claim 1, characterized in that a plurality of said particles (40) are distributed in a region enclosed by said connection layer (30).
3. The optical film as claimed in claim 2, wherein the surface of the polarizer (20) adjacent to the prism sheet (10) has at least one particle distribution region (20a), the at least one particle distribution region (20a) is located in the middle of the polarizer (20), and the particles (40) are located in the particle distribution region (20 a).
4. The optical film according to claim 3, wherein a plurality of said particles (40) are uniformly distributed in said particle distribution region (20 a).
5. Optical film according to claim 1, characterized in that the particles (40) have a diameter of 0.1 to 100 μm.
6. Optical film according to claim 1, characterized in that said particles (40) are made of a polymeric transparent material.
7. The optical film according to any one of claims 1 to 6, wherein the prism sheet (10) comprises a substrate layer (11) and a plurality of prism structures (12), and the plurality of prism structures (12) are located on one side of the substrate layer (11) close to the polarizer (20) and distributed in an area surrounded by the connection layer (30).
8. The optical film according to claim 7, wherein the prismatic structures (12) are trapezoidal in cross-section.
9. A backlight module comprising a light guide plate (50) and the optical film of any one of claims 1 to 8, wherein the optical film is located on the light exit side of the light guide plate (50), and the prism sheet (10) is located close to the light guide plate (50).
10. A display device comprising the backlight module according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220040302.1U CN216526646U (en) | 2022-01-07 | 2022-01-07 | Optical film, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220040302.1U CN216526646U (en) | 2022-01-07 | 2022-01-07 | Optical film, backlight module and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216526646U true CN216526646U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220040302.1U Active CN216526646U (en) | 2022-01-07 | 2022-01-07 | Optical film, backlight module and display device |
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|---|---|
| CN (1) | CN216526646U (en) |
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- 2022-01-07 CN CN202220040302.1U patent/CN216526646U/en active Active
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