Peep-proof film, backlight module and display module

Abstract

The peep-proof film comprises a first substrate, a peep-proof layer and a second substrate, the peep-proof layer is located between the first substrate and the second substrate, the peep-proof layer comprises reflection gratings which are arranged in sequence, a plurality of microstructures are arranged on the surfaces of the reflection gratings, and the microstructures are arranged on the first substrate and the second substrate. The microstructures on the two adjacent reflection gratings are symmetrically arranged, and the microstructures are used for changing the reflection angle of the reflected light of the reflection gratings. Compared with a black absorption grating in the related technology, the technical scheme provided by the embodiment is beneficial to increasing the utilization rate of backlight provided by the backlight module and improving the lighting effect of the peep-proof film, so that the power consumption of the backlight module can be reduced, the highlight effect can be achieved without using a high-power-consumption backlight source, and energy conservation and environmental protection are facilitated.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of display technology, and in particular to an anti-peep film, a backlight module and a display module. Background Art

[0002] Existing electronic devices have developed in a diversified manner and are used very frequently in daily life. The requirements for personal privacy protection are also increasing, so many products with anti-peeping effects have appeared on the market.

[0003] Current anti-peeping products usually use anti-peeping films to achieve anti-peeping. Anti-peeping films achieve anti-peeping by transmitting light at a narrow angle and absorbing light at a wide angle. Therefore, anti-peeping films are generally designed with a black grating structure. When light enters, the light at a wide angle is absorbed by the black grating, and only light at a small angle is transmitted out, so that the module achieves the anti-peeping effect.

[0004] However, such a design makes the brightness and power consumption of the privacy protection product not advantageous. For products with higher brightness requirements, after using the privacy protection film, in order to ensure the brightness remains unchanged, the backlight brightness needs to be increased, resulting in higher backlight power consumption, affecting the reliability and service life of the product. Utility Model Content

[0005] The embodiments of the present invention provide an anti-peep film, a backlight module and a display module to improve the light efficiency of the anti-peep film and reduce the backlight power consumption.

[0006] According to one aspect of the present invention, a privacy film is provided for use in a backlight module. The privacy film comprises:

[0007] a first substrate and a second substrate;

[0008] An anti-peeping layer is located between the first substrate and the second substrate, and the anti-peeping layer includes reflective gratings arranged in sequence, and a plurality of microstructures are provided on the surface of the reflective gratings. The microstructures on two adjacent reflective gratings are symmetrically arranged, and the microstructures are used to change the reflection angle of the reflected light of the reflective gratings.

[0009] Optionally, the microstructure is a convex structure.

[0010] Optionally, the microstructure includes a triangular structure or a semi-convex circular structure.

[0011] Optionally, the triangular structure is a right-angled triangle structure, a first right-angled side of the right-angled triangle structure is in contact with the surface of the reflection grating, a second right-angled side of the right-angled triangle structure is perpendicular to the surface of the reflection grating, and the second right-angled side is located on a side of the hypotenuse of the right-angled triangle structure close to the second substrate;

[0012] The light emitted by the backlight module is incident from the second substrate and emitted from the first substrate.

[0013] Optionally, the length of the first right-angled side is greater than or equal to the length of the second right-angled side.

[0014] Optionally, the microstructure and the reflective grating are an integrated structure.

[0015] Optionally, a reflective layer is formed on the reflective grating, and the reflective layer wraps the microstructure and the reflective grating.

[0016] Optionally, the distance between two adjacent reflection gratings is adjustable.

[0017] According to another aspect of the present invention, a backlight module is provided. The backlight module includes the privacy film provided in any embodiment of the present invention, and the privacy film is located on the light-emitting side of the backlight module.

[0018] According to another aspect of the present invention, a display module is provided, comprising a display panel and a backlight module provided by any embodiment of the present invention, wherein the display panel is located on a side of the privacy film away from a backlight source in the backlight module.

[0019] The technical solution provided by the embodiments of the present invention modifies the angle of incidence of light reflected from the reflective grating by providing a microstructure on the reflective grating located between the first and second substrates. This allows light incident on the reflective grating to be emitted at a specific angle after reflection, allowing even light incident at large angles to be transmitted. This reduces the obstruction of large-angle incident light by the privacy layer, allowing more light to escape the privacy film. Compared to the black absorption grating used in related technologies, the technical solution provided by this embodiment increases the utilization of the backlight provided by the backlight module, improves the light efficiency of the privacy film, and thus reduces the power consumption of the backlight module. High brightness can be achieved without the use of a high-power backlight source, contributing to energy conservation and environmental protection.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a privacy film provided by an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a reflective grating provided in an embodiment of the present utility model;

[0024] Figure 3 A schematic diagram of the optical path of a reflective grating provided in an embodiment of the present utility model;

[0025] Figure 4 A schematic structural diagram of another reflective grating provided in an embodiment of the present utility model;

[0026] Figure 5 A schematic diagram of the optical path of another reflective grating provided in an embodiment of the present utility model;

[0027] Figure 6 A schematic diagram of a process flow for preparing a privacy film according to an embodiment of the present invention;

[0028] Among them, 10 is the first substrate; 20 is the second substrate; 30 is the reflection grating; and 40 is the UV lamp.

[0029] 301-Microstructure. DETAILED DESCRIPTION

[0030] In order to help those skilled in the art better understand the present invention, the following will be combined with 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Figure 1This is a schematic diagram of the structure of an anti-peep film provided by an embodiment of the present invention. The anti-peep film provided by this embodiment can be applied to a backlight module to block the large-angle emitted light of the backlight module to achieve a good anti-peep effect. Figure 1 , the privacy film includes:

[0033] a first substrate 10 and a second substrate 20;

[0034] The anti-peeping layer is located between the first substrate 10 and the second substrate 20. The anti-peeping layer includes reflective gratings 30 arranged in sequence. A plurality of microstructures 301 are provided on the surface of the reflective gratings 30. The microstructures 301 on two adjacent reflective gratings 30 are symmetrically arranged. The microstructures 301 are used to change the reflection angle of the reflected light of the reflective gratings 30.

[0035] Specifically, multiple gratings are arranged in a louver structure between the first substrate 10 and the second substrate 20. When light emitted by the backlight module is incident perpendicularly (with an incident angle of 0°) on the privacy film, the light can pass through the gratings unimpeded and exit from the first substrate 10. As the incident angle of the light increases or decreases, the light is blocked by the gratings in the louver structure, reducing the amount of light passing through the privacy film. This ensures that only users facing the screen receive sufficient light to see the screen clearly, while bystanders at a certain angle to the screen receive less light, making the screen appear pitch black, thus achieving an anti-privacy effect.

[0036] The first substrate 10 and the second substrate 20 are made of a material with ball-drop resistance and scratch resistance, such as acrylic or organic glass, or carbonated polyester optical plastic.

[0037] In this embodiment, the grating of the shutter structure is a reflective grating 30, for example, a total reflection grating, which can fully reflect incident light, thereby facilitating increased light transmittance. The reflective grating 30 has a first surface and a second surface disposed opposite each other, each of which is provided with a plurality of microstructures 301. Specifically, the microstructures 301 on two adjacent reflective gratings 30 are symmetrically arranged. The microstructures 301 adjust the reflection angle of light incident on the surfaces of the reflective gratings 30, allowing at least a portion of the reflected light to exit from between the two adjacent reflective gratings 30, thereby facilitating increased light utilization.

[0038] The technical solution provided by the embodiment of the present invention modifies the angle of incidence of light reflected from the reflective grating 30 by providing a microstructure on the reflective grating 30 located between the first substrate 10 and the second substrate 20. This allows light incident on the reflective grating 30 to be emitted at a specific angle after reflection. Even light incident at a large angle can be transmitted, reducing the obstruction of the privacy layer to light incident at large angles, thereby allowing more light to escape the privacy film. Compared to the black absorption grating in the related art, the technical solution provided by this embodiment helps increase the utilization rate of the backlight provided by the backlight module, improves the light efficiency of the privacy film, and thus reduces the power consumption of the backlight module. High brightness can be achieved without using a high-power backlight source, which is beneficial for energy conservation and environmental protection.

[0039] Optionally, in this embodiment, the microstructure 301 on the reflective grating 30 is a convex structure, which can cause the incident light to be scattered more on its surface, so that the originally more regularly propagated light will be reflected in different directions, thereby making the exit angle of the reflected light more diversified. By reasonably setting the microstructure, the anti-peeping angle can be further expanded so that the large-angle incident light can be effectively reflected to the user's eyes.

[0040] Figure 2 A schematic structural diagram of a reflective grating provided in an embodiment of the present utility model is shown in FIG. Figure 3 A schematic diagram of the optical path of a reflective grating provided in an embodiment of the present utility model, combined with Figures 1 to 3 The microstructure 301 can be a triangular structure, which is a right-angled triangle structure. The first right-angled side of the right-angled triangle structure is in contact with the surface of the reflection grating 30, and the second right-angled side of the right-angled triangle structure is perpendicular to the surface of the reflection grating 30. The second right-angled side is located on the side of the hypotenuse of the right-angled triangle structure close to the second substrate 20. The light emitted by the backlight module is incident from the second substrate 20 and emitted from the first substrate 10.

[0041] Specifically, if Figure 3 As shown, on two adjacent reflective gratings 30, the microstructures 301 on the second surface of one reflective grating 30 and the microstructures 301 on the first surface of the other reflective grating 30 are symmetrically arranged. When the incident light passes through the second substrate 20 and is incident on the reflective grating 30 on the left, the reflection angle of the reflected light changes due to the right-angled triangle structure of the microstructure 301. Some of the light may be directly emitted from the first substrate 10, while another part of the light will be reflected to the reflective grating 30 on the right and then emitted from the first substrate 10 after the emission angle is readjusted. Some of the light may not be emitted from the first substrate 10, but return to the backlight module and then enter the anti-peep film again for modulation, so that more light can be transmitted from the first substrate 10 to increase the light effect.

[0042] For example, when the incident light enters the first substrate 10 at an incident angle of 61° (green line), it is reflected by the reflection grating 30 on the left and then directly transmitted from the first substrate 10 at an exit angle of 14°; when the incident light enters the first substrate 10 at an incident angle of 44° (blue line), it is reflected by the reflection grating 30 on the left and then reflected onto the reflection grating 30 on the right. After the reflection angles are adjusted multiple times by the reflection gratings 30 on the left and right sides, the light is transmitted from the first substrate 10 at an exit angle of 36°; a portion of the light (such as the red line) returns to the backlight module after the reflection angles are adjusted multiple times by the reflection gratings 30 on the left and right sides.

[0043] Optionally, in a right-angled triangle structure, the length of the first right-angled side is greater than or equal to the length of the second right-angled side, and preferably the length of the first right-angled side is greater than the length of the second right-angled side. By setting the second right-angled side at the bottom as a short side, the obstruction of the incident light can be reduced, and most of the incident light can be avoided from being directly reflected back by the second right-angled side, which is beneficial to increasing the reflectivity of the hypotenuse to more incident light, thereby improving the lighting efficiency.

[0044] Figure 4 A schematic structural diagram of another reflective grating provided in an embodiment of the present utility model. Figure 5 A schematic diagram of the optical path of another reflective grating provided in an embodiment of the present invention, combined with Figure 1 、 Figure 4 and Figure 5 Optionally, the microstructure 301 may also be a semi-convex structure. Since the surface of the semi-convex structure is arc-shaped, due to its circumferential arc characteristics, the reflected light will diffuse more regularly in all directions within a certain range, which can make the light reflection angle distribution more uniform, thereby being able to achieve effective control of the light within a wider angle range, and thus enabling light of more angles to be transmitted from the first substrate 10. Even if the incident light is at a large angle, when passing through the reflective grating 30 with a semi-convex structure, after multiple reflections by the reflective grating 30, the light can be guided to the target area (i.e., the visible area), thereby improving the utilization efficiency of the light in the target area and helping to improve the light effect.

[0045] For example, Figure 5As shown, when the incident light enters the first substrate 10 at an incident angle of 60° (green line), it is reflected by the reflection grating 30 on the left and then reflected to the reflection grating 30 on the right. After the angle of the reflection grating 30 on the right is adjusted, it is transmitted out of the first substrate 10 at an exit angle of 48°; when the incident light enters the first substrate 10 at an incident angle of 44° (blue line), it is reflected by the reflection grating 30 on the left and then transmitted out of the first substrate 10 at an exit angle of 29°; when the incident light enters the first substrate 10 at an incident angle of 31° (red line), it is reflected by the reflection grating 30 on the left and then transmitted out of the first substrate 10 at an exit angle of 42°.

[0046] In this embodiment, taking the existing black absorptive privacy film with an anti-peeping angle of 30° (common anti-peeping angles include 25°, 30°, and 45°) as an example, the anti-peeping angle of the privacy film formed by providing a triangular microstructured reflective grating 30 can be increased to 38° (i.e., -38° to 38°). The anti-peeping angle of the privacy film formed by providing a semi-convex microstructured reflective grating 30 can be increased to 50° (i.e., -50° to 50°). Compared to the existing black absorptive privacy film, the technical solution provided by the embodiment of the utility model can increase the anti-peeping angle by 8° to 20°, and the light efficiency is at least doubled, thus meeting the high brightness requirement without increasing the power consumption of the backlight module.

[0047] Furthermore, by using the reflective grating 30 provided in this embodiment to improve light efficiency, there is no need to increase the number of LEDs in the backlight module to achieve high brightness specifications, which helps reduce costs and thus improves product competitiveness. In addition, when the number of LEDs is small, there is no need to use a heat sink or a higher-specification heat sink to dissipate heat from the backlight module, which can further reduce costs.

[0048] Optionally, in this embodiment, the spacing between two adjacent reflective gratings 30 is adjustable. Since the privacy film provided in this embodiment has a larger viewing angle than the original privacy film, the spacing between two adjacent reflective gratings 30 can be reduced based on the original spacing to make the privacy film's viewing angle close to the original viewing angle, thereby achieving high-efficiency backlighting at the same or similar viewing angles.

[0049] It should be noted that in actual applications, the distance between two adjacent reflective gratings 30 can be flexibly adjusted according to specific needs. For example, if a larger anti-peeping angle is required, the distance between two adjacent reflective gratings 30 can be increased; if a smaller anti-peeping angle is required, the distance between two adjacent reflective gratings 30 can be decreased.

[0050] Optionally, in this embodiment, the microstructure 301 and the reflective grating 30 are an integrated structure, so that the overall structure can remain stable to ensure the effective function of the reflective grating 30 and the microstructure 301. At the same time, the optical connection between the microstructure 301 and the reflective grating 30 of the integrated structure is closer, which is beneficial to reducing the reflection loss when light is transmitted between different structures, thereby improving the overall optical performance of the anti-peep film.

[0051] In the actual manufacturing process, the microstructure 301 and the reflective grating 30 of the integrated structure can be processed at one time by a rolling mold, which is conducive to simplifying the manufacturing process.

[0052] In this embodiment, the reflective grating 30 includes a reflective layer that wraps around the microstructure 301 and the reflective grating 30. For example, the reflective grating 30 may be silver-plated, where silver ions are spray-coated onto the reflective grating 30. This allows the reflective layer formed by the silver ions to wrap around the microstructure 301 and the reflective grating 30, thereby reflecting light.

[0053] Of course, in other embodiments, the reflective grating 30 may also be coated with other materials having a reflective effect.

[0054] Figure 6 A schematic diagram of a process flow for preparing a privacy film according to an embodiment of the present invention is provided. Figure 6 The preparation process of the privacy film provided in this embodiment is as follows:

[0055] First, a first substrate 10 is provided, and a grating layer 31 is formed under the first substrate 10, wherein the grating layer 31 can be formed of a resin material. The grating layer 31 is then processed to form a grating with a louver structure. When processing the microstructure 301 in the form of a louver, it can be processed in one go by a rolling gear with a concave triangular or semi-concave circular structure, and after the microstructure 301 is formed, a UV (Ultra-Violet Ray) lamp 40 is used to irradiate it to cure the microstructure 301. Then, a silver ion solvent is sprayed on the patterned grating layer 31 so that the reflective layer formed by the silver ions wraps the microstructure 301 and the reflective grating 30, and the UV lamp 40 is used to irradiate it again to cure the reflective layer formed by the silver ions, thereby forming a reflective grating 30. Finally, the second substrate 30 is bonded, and after standing and curing, it is cut to form an anti-peep film.

[0056] Optionally, an embodiment of the present invention further provides a backlight module, which includes the privacy film provided in any embodiment of the present invention. The privacy film is located on the light-emitting side of the backlight module to reduce the emission of light at large angles, thereby achieving a privacy protection function. Since the backlight module provided in this embodiment includes the privacy film provided in any of the above embodiments, the backlight module also has the beneficial effects described in any of the above embodiments.

[0057] Optionally, embodiments of the present invention further provide a display module comprising a display panel and the backlight module provided in the above embodiments, wherein the display panel is located on the side of the privacy film away from the backlight source in the backlight module, that is, the privacy film is located between the display panel and the backlight source. Since the display module provided in this embodiment includes the backlight module provided in any of the above embodiments, the display module also has the beneficial effects described in any of the above embodiments.

[0058] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this utility model can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this utility model can be achieved. This is not limited herein.

[0059] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A privacy film, applied to a backlight module, characterized in that: The privacy film comprises: a first substrate and a second substrate; An anti-peeping layer is located between the first substrate and the second substrate, and the anti-peeping layer includes reflective gratings arranged in sequence, and a plurality of microstructures are provided on the surface of the reflective gratings. The microstructures on two adjacent reflective gratings are symmetrically arranged, and the microstructures are used to change the reflection angle of the reflected light of the reflective gratings.

2. The privacy film according to claim 1, wherein: The microstructure is a convex structure.

3. The privacy film according to claim 2, characterized in that: The microstructure includes a triangular structure or a semi-convex circular structure.

4. The privacy film according to claim 3, characterized in that: The triangular structure is a right-angled triangle structure, wherein a first right-angled side of the right-angled triangle structure is in contact with the surface of the reflection grating, a second right-angled side of the right-angled triangle structure is perpendicular to the surface of the reflection grating, and the second right-angled side is located on a side of the hypotenuse of the right-angled triangle structure close to the second substrate; The light emitted by the backlight module is incident from the second substrate and emitted from the first substrate.

5. The privacy film according to claim 4, characterized in that: The length of the first right-angled side is greater than or equal to the length of the second right-angled side.

6. The privacy film according to claim 1, wherein: The microstructure and the reflective grating are an integrated structure.

7. The privacy film according to claim 1, wherein: A reflective layer is formed on the reflective grating, and the reflective layer wraps the microstructure and the reflective grating.

8. The privacy film according to claim 1, wherein: The distance between two adjacent reflection gratings is adjustable.

9. A backlight module, characterized in that: The privacy film comprises the privacy film according to any one of claims 1 to 8, wherein the privacy film is located on the light-emitting side of the backlight module.

10. A display module, characterized in that: The device comprises a display panel and the backlight module according to claim 9, wherein the display panel is located on a side of the privacy film away from a backlight source in the backlight module.

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