Privacy film and display device

Abstract

This application discloses a privacy film and a display device, wherein the privacy film includes: a first substrate; a second substrate; a liquid crystal layer disposed between the first and second substrates; a first electrode; and a second electrode, the second electrode and the first electrode being disposed on the same side or different sides of the liquid crystal layer, at least one of the second electrode and the first electrode including a strip electrode; wherein, in a first mode, no voltage is applied to the second electrode and the first electrode, the liquid crystal molecules of the liquid crystal layer have a pretilt angle, and the privacy film is in a privacy state; in a second mode, a voltage is applied to the second electrode and the first electrode, the liquid crystal layer diffracts incident light perpendicular to the plane of the first substrate, and the privacy film is in a privacy state. This application utilizes the diffraction characteristics of liquid crystal to form a privacy device, which has the advantages of lower manufacturing process requirements and lower cost compared to privacy display devices based on the electronically controlled birefringence characteristics of liquid crystal, and the privacy film of this application also has better reliability.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a privacy film and a display device. Background Technology

[0002] In the rapidly developing information age, people are paying increasing attention to the protection of their personal information. Therefore, a type of display device with privacy features has emerged. These devices allow only users at a direct viewing angle to see the displayed content, while preventing onlookers at the side from seeing it, effectively protecting user privacy. Traditional privacy displays require a privacy film, but they cannot automatically switch between privacy and normal display modes, and traditional view-controlled privacy displays lack adjustable viewing angles. Another type of display device with privacy and switching functions requires special electrode design, but this often affects display quality, such as reduced contrast, color distortion, and poor resolution.

[0003] Existing display devices with privacy and switching functions typically rely on the electrically controlled birefringence of liquid crystals. Utilizing this principle, a dimming liquid crystal cell acts as an electrically controlled half-wave plate to regulate light, blocking wide-viewing-angle light from the lower polarizer of the display device or the dimming cell, thus achieving privacy and narrowing the viewing angle. However, privacy display devices based on the electrically controlled birefringence of liquid crystals are difficult to manufacture, costly, and have low reliability. Summary of the Invention

[0004] This application provides a privacy screen protector and a display device to reduce the manufacturing difficulty and cost of privacy screen display devices.

[0005] This application provides a privacy film, comprising:

[0006] First substrate;

[0007] Second substrate;

[0008] A liquid crystal layer is disposed between the first substrate and the second substrate;

[0009] First electrode;

[0010] The second electrode and the first electrode are disposed on the same side or different sides of the liquid crystal layer, and at least one of the second electrode and the first electrode includes a strip electrode.

[0011] In the first mode, no voltage is applied to the second electrode and the first electrode, the liquid crystal molecules of the liquid crystal layer have a pretilt angle, and the privacy film is in a privacy state; in the second mode, voltage is applied to the second electrode and the first electrode, the liquid crystal layer diffracts incident light perpendicular to the plane of the first substrate, and the privacy film is in a sharing state.

[0012] Optionally, in some embodiments of this application, at least one of the second electrode and the first electrode includes at least two strip electrodes, which are spaced apart from each other.

[0013] Optionally, in some embodiments of this application, the ratio of the length of the strip electrode perpendicular to the extension direction of the strip electrode to the spacing between adjacent strip electrodes perpendicular to the extension direction of the strip electrode is greater than or equal to 0.7 and less than or equal to 0.78.

[0014] Optionally, in some embodiments of this application, the first electrode is disposed on the side of the first substrate near the liquid crystal layer, the second electrode is disposed on the side of the first electrode near the liquid crystal layer, and an insulating layer is provided between the second electrode and the first electrode.

[0015] Optionally, in some embodiments of this application, in the first mode, the pretilt angle is the angle between the long axis of the liquid crystal molecules in the liquid crystal layer and the extension direction of the strip electrode, and the pretilt angle is greater than zero degrees and less than or equal to 15 degrees.

[0016] Optionally, in some embodiments of this application, the first electrode is a full-surface electrode, and the second electrode is a strip electrode.

[0017] Optionally, in some embodiments of this application, both the first electrode and the second electrode are strip electrodes, and the orthographic projections of the first electrode and the second electrode on the first substrate are staggered.

[0018] Optionally, in some embodiments of this application, the first electrode is disposed on the side of the first substrate near the liquid crystal layer, and the second electrode is disposed on the side of the second substrate near the liquid crystal layer. Both the first electrode and the second electrode are strip-shaped electrodes, and the orthographic projections of the first electrode and the second electrode on the first substrate are staggered.

[0019] Optionally, in some embodiments of this application, in the first mode, the pretilt angle is the angle between the long axis of the liquid crystal molecules in the liquid crystal layer and the normal direction of the first substrate, and the pretilt angle is greater than zero degrees and less than or equal to 15 degrees.

[0020] Accordingly, this application also provides a display device, which includes:

[0021] The privacy film described above;

[0022] First polarizer;

[0023] Second polarizer;

[0024] The display panel is disposed between the first polarizer and the second polarizer;

[0025] The privacy film is positioned on the side of the first polarizer away from the display panel.

[0026] Optionally, in some embodiments of this application, the display device further includes:

[0027] Collimated light source;

[0028] A light guide plate is disposed on the side of the privacy film away from the display panel, and the collimating light source is disposed on one side of the light guide plate.

[0029] Optionally, in some embodiments of this application, the display device further includes:

[0030] Backlight source;

[0031] A light guide plate is provided on the side of the privacy film away from the display panel, and a backlight source is provided on one side of the light guide plate. A collimation film is provided between the backlight source and the light guide plate.

[0032] This application provides a privacy film and a display device, wherein the privacy film includes: a first substrate; a second substrate; a liquid crystal layer disposed between the first substrate and the second substrate; a first electrode; and a second electrode, wherein the second electrode and the first electrode are disposed on the same side or different sides of the liquid crystal layer, and at least one of the second electrode and the first electrode includes a strip-shaped electrode; wherein, in a first mode, no voltage is applied to the second electrode and the first electrode, the liquid crystal molecules of the liquid crystal layer have a pretilt angle, and the privacy film is in a privacy state; in a second mode, voltage is applied to the second electrode and the first electrode, the liquid crystal layer diffracts incident light perpendicular to the plane of the first substrate, and the privacy film is in a sharing state. This application enables the privacy film to be in a privacy state in the first mode; and in the second mode, enables the liquid crystal layer to diffract incident light perpendicular to the plane of the first substrate, and the privacy film to be in a sharing state; therefore, this application utilizes the diffraction characteristics of liquid crystal to form a privacy device, which has the advantages of lower manufacturing process requirements and lower cost compared to privacy display devices based on liquid crystal electro-controlled birefringence characteristics, and the privacy film of this application also has better reliability. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a first structural schematic diagram of the privacy film provided in this application;

[0035] Figure 2 This is a planar schematic diagram of the liquid crystal molecules in the liquid crystal layer in the first mode;

[0036] Figure 3 A first structural schematic diagram of the display device provided in this application;

[0037] Figure 4 A second structural schematic diagram of the display device provided in this application;

[0038] Figure 5 This is a schematic diagram of the second structure of the privacy film provided in this application;

[0039] Figure 6 This is a schematic diagram of the third structure of the privacy film provided in this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] This application provides a privacy screen protector and a display device, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application.

[0043] Please see Figure 1 and Figure 2 , Figure 1 This is a first structural schematic diagram of the privacy film 100 provided in this application. Figure 2 This is a planar schematic diagram of the liquid crystal molecules 51 of the liquid crystal layer 50 in a first mode. This application also provides a privacy film 100, which includes: a first substrate 10, a second substrate 20, a liquid crystal layer 50, a first electrode 30, and a second electrode 40;

[0044] The liquid crystal layer 50 is disposed between the first substrate 10 and the second substrate 20;

[0045] The second electrode 40 and the first electrode 30 are disposed on the same side or different sides of the liquid crystal layer 50, and at least one of the second electrode 40 and the first electrode 30 includes a strip electrode. When a voltage is applied to the second electrode 40 and the first electrode 30, an electric field is generated in the liquid crystal layer 50.

[0046] In the first mode, no voltage is applied to the second electrode 40 and the first electrode 30, the liquid crystal molecules 51 of the liquid crystal layer 50 have a pretilt angle A, and the privacy film 100 is in a privacy state; in the second mode, voltage is applied to the second electrode 40 and the first electrode 30, the liquid crystal layer 50 diffracts the incident light perpendicular to the plane of the first substrate 10, and the privacy film 100 is in a sharing state.

[0047] At least one of the second electrode 40 and the first electrode 30 is arranged as a strip electrode, which can generate an electric field in a part of the liquid crystal layer 50 while the electric field is weak or non-existent in another part of the liquid crystal layer 50. Therefore, the second electrode 40 and the first electrode 30 form multiple spaced electric fields in the liquid crystal layer 50. This allows the incident light to generate a phase difference after entering the liquid crystal layer 50, so that the amplitude or phase of the incident light is periodically spatially modulated. Therefore, the liquid crystal layer 50 has the function of a phase grating and can diffract the incident light.

[0048] In the first mode, no voltage is applied to the second electrode 40 and the first electrode 30. The liquid crystal molecules 51 in the liquid crystal layer 50 are pre-aligned to form a consistent alignment. When light is incident on the liquid crystal layer 50 from a direction perpendicular to the plane of the first substrate 10, the liquid crystal molecules 51 in the liquid crystal layer 50 have a pretilt angle A, so the liquid crystal layer 50 will not cause the incident light to form a phase difference. The incident light has no scattering or diffraction phenomenon. However, in the side view direction of the privacy film 100, the effective long axis 511 of the liquid crystal dimming layer has an angle with the direction of the incident light. Therefore, the light in the side view direction of the privacy film 100 is darker, thus achieving privacy protection. The privacy film 100 is in a privacy protection state. After a voltage is applied to the second electrode 40 and the first electrode 30, the liquid crystal molecules 51 rotate periodically under the action of the electric field between the second electrode 40 and the first electrode 30. The incident light perpendicular to the plane of the first substrate 10 is dispersed into polarized light of multiple diffraction orders through the transmissive liquid crystal layer 50, so that the incident light forms a periodic phase difference, that is, a diffraction effect is generated on the incident light perpendicular to the plane of the first substrate 10. In other words, the liquid crystal cell has a high haze scattering effect. The liquid crystal cell can scatter the incident light to achieve the sharing effect of the privacy film 100, and the privacy film 100 is in a sharing state.

[0049] The "peeping mode" refers to a state where the light is dimmer when viewed from the side of the privacy film 100, while the light is at normal brightness when viewed directly from the front. Therefore, an observer viewing the privacy film 100 from the side would perceive it as dimmer. The "sharing mode" refers to a state where the light is at normal brightness in both the side and front views of the privacy film 100. Therefore, an observer viewing the privacy film 100 from both the side and front views would perceive it as having normal brightness.

[0050] Furthermore, this application utilizes the diffraction properties of liquid crystal to form a phase grating, thereby forming a privacy device. It does not require a polarizer, whereas privacy display devices based on the electro-hydraulic birefringence properties of liquid crystal require a polarizer. Compared with privacy display devices based on the electro-hydraulic birefringence properties of liquid crystal, this application has the advantages of lower manufacturing process requirements and lower cost. At the same time, the privacy film 100 of this application has better reliability.

[0051] The magnitude of the voltage applied between the first electrode 30 and the second electrode 40 is not particularly limited and can be set appropriately. The maximum voltage is preferably 3V to 50V, more preferably 4V to 10V, and especially preferably 6V to 10V.

[0052] Furthermore, at least one of the second electrode 40 and the first electrode 30 includes at least two strip electrodes, which are arranged at intervals.

[0053] In some embodiments, the ratio of the length of the strip electrode perpendicular to its extension direction to the spacing between adjacent strip electrodes perpendicular to their extension direction is greater than or equal to 0.7 and less than or equal to 0.78. This ratio parameter can be set based on the response time of the liquid crystal molecules 51 and the haze requirements of the privacy film 100. Further, the strip electrode extends along a straight line.

[0054] The liquid crystal layer 50 includes a polymer network 52 and liquid crystal molecules 51 distributed within the polymer network 52. During the pre-alignment of the liquid crystal molecules 51, an electric field can be used to tilt the liquid crystal molecules 51 to a set angle. Then, the polymer in the dimming liquid crystal layer 50 is cured by means of ultraviolet light or the like to form the polymer network 52. After the electric field is removed, the polymer network 52 will maintain the liquid crystal molecules 51 tilted at the set angle. In the above case, an optimal set angle can be selected according to actual needs, and then the polymer network 52 can be used to maintain the liquid crystal molecules 51 tilted at the set angle.

[0055] It should be noted that this application can also use alignment films to pre-align liquid crystal molecules. Using alignment films to pre-align liquid crystal molecules is a conventional technique in this field and will not be explained in detail here.

[0056] Furthermore, in some embodiments, the electrical anisotropy of the liquid crystal molecules 51 in the liquid crystal layer 50 is greater than or equal to 7 and less than or equal to 15.2. The dielectric constant of the liquid crystal molecules 51 differs along the major axis 511 and the minor axis. Typically, the dielectric constant component along the major axis 511 of the liquid crystal molecules 51 is defined as ε∥, and the dielectric constant component perpendicular to the major axis 511 of the liquid crystal molecules 51 is defined as ε⊥, with the difference Δε = ε∥ - ε⊥. When Δε > 0, the liquid crystal is electrically referred to as a positive liquid crystal, and the major axis 511 of the liquid crystal molecules 51 rotates in a direction parallel to the electric field lines; when Δε < 0, it is referred to as a negative liquid crystal, and the major axis 511 of the liquid crystal rotates in a direction perpendicular to the electric field lines. Liquid crystal materials and liquid crystal molecules 51 with positive dielectric anisotropy have characteristics such as high phase transition temperature and high-speed response (low rotational viscosity). The electrical anisotropy of the liquid crystal molecules 51 in this application is greater than or equal to 7 and less than or equal to 15.2, thus achieving a very good diffraction effect.

[0057] Furthermore, in some embodiments, the optical anisotropy of the liquid crystal molecules 51 in the liquid crystal layer 50 is greater than or equal to 2 and less than or equal to 3. The optical refractive index of the liquid crystal molecules 51 differs along the major axis 511 and the minor axis, with the refractive index component along the major axis 511 being n∥ and the refractive index component perpendicular to the major axis 511 being n⊥. The component of light refracted by the liquid crystal molecules 51 that follows the law of refraction is called ordinary ray, i.e., o-ray; the other component does not follow the law of refraction and is called extraordinary ray, i.e., e-ray. The vibration directions of o-ray and e-ray are perpendicular to each other. Since o-ray and e-ray have different propagation speeds, there is a phase difference between them after they are transmitted through the liquid crystal molecules 51. The magnitude of the phase difference determines the vibration direction and intensity of the light after they are combined. This application sets the optical anisotropy of the liquid crystal molecules 51 to be greater than or equal to 2 and less than or equal to 3, which allows the liquid crystal layer 50 to form a better phase liquid crystal grating, thus achieving a very good diffraction effect.

[0058] Furthermore, in some embodiments, the first electrode 30 is disposed on the side of the first substrate 10 near the liquid crystal layer 50, the second electrode 40 is disposed on the side of the first electrode 30 near the liquid crystal layer 50, and an insulating layer 60 is provided between the second electrode 40 and the first electrode 30.

[0059] Specifically, in the first mode, the pretilt angle A is the angle between the major axis 511 of the liquid crystal molecule 51 in the liquid crystal layer 50 and the extending direction of the strip electrode, and the pretilt angle A is greater than zero degrees and less than or equal to 15 degrees. Further, in the first mode, the pretilt angle A is 5 degrees, 7 degrees, or 10 degrees.

[0060] Moreover, the first electrode 30 is a full-surface electrode, and the second electrode 40 is a strip electrode.

[0061] Please refer to the table below. The table shows the experimental parameters for side-viewing the fogging of the privacy film 100. From the parameters in the table, it can be seen that when no voltage is applied to the second electrode 40 and the first electrode 30, the liquid crystal molecules 51 of the liquid crystal layer 50 have a pretilt angle A, and the privacy film 100 is in a privacy-preventing state, at which time the privacy film 100 has minimum fogging. When the applied voltage to the second electrode 40 and the first electrode 30 reaches a set value, and the thickness of the liquid crystal layer 50 is a set value, combined with the electrical and optical anisotropy parameters of the liquid crystal molecules 51, maximum fogging can be obtained, at which time the privacy film 100 is in a sharing state.

[0062]

[0063] Please refer to Figure 3 , Figure 3This is a first structural schematic diagram of the display device 200 provided in this application. Accordingly, embodiments of this application also provide a display device 200, which includes:

[0064] The privacy film 100 described above;

[0065] First polarizer 201;

[0066] Second polarizer 202;

[0067] Display panel 203 is disposed between the first polarizer 201 and the second polarizer 202;

[0068] The privacy film 100 is disposed on the side of the first polarizer 201 away from the display panel 203.

[0069] The optical axis of the first polarizer 201 is perpendicular to the optical axis of the second polarizer 202.

[0070] The principle by which the display device 200 solves the problem is similar to that of the aforementioned privacy film 100. Therefore, the implementation and beneficial effects of the display device 200 can be found in the description of the aforementioned privacy film 100, and the repetition will not be repeated here.

[0071] Furthermore, in some embodiments, the display device 200 further includes:

[0072] Collimated light source 204;

[0073] A light guide plate 205 is disposed on the side of the privacy film 100 away from the display panel 203, and a collimating light source 204 is disposed on one side of the light guide plate 205.

[0074] This application uses a collimated light source 204 as the backlight source of the display device 200. The collimated light source 204 has the characteristic of a small light angle, which is beneficial to obtaining a better narrow viewing angle effect.

[0075] Please refer to Figure 4 , Figure 4 This is a second structural schematic diagram of the display device 200 provided in this application. This embodiment is similar to... Figure 3 Unlike the provided display device 200, the display device 200 also includes:

[0076] Backlight source 206;

[0077] A light guide plate 205 is disposed on the side of the privacy film 100 away from the display panel 203. A backlight source 206 is disposed on one side of the light guide plate 205. A collimation film 207 is provided between the backlight source 206 and the light guide plate 205.

[0078] The backlight source 206 is a common light source. The light from the backlight source is converted into collimated light by the collimating diaphragm 207 before being incident on the light guide plate 205, thus achieving a better narrow viewing angle effect.

[0079] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the second structure of the privacy film 100 provided in this application. This embodiment is similar to... Figure 1 The privacy film 100 provided is different in that: the first electrode 30 and the second electrode 40 are both strip electrodes, and the orthographic projection of the first electrode 30 on the first substrate 10 and the orthographic projection of the second electrode 40 on the first substrate 10 are staggered.

[0080] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the third structure of the privacy film 100 provided in this application. This embodiment is similar to... Figure 1 The privacy screen protector 100 provided is different in that: the first electrode 30 is disposed on the side of the first substrate 10 near the liquid crystal layer 50, and the second electrode 40 is disposed on the side of the second substrate 20 near the liquid crystal layer 50. Both the first electrode 30 and the second electrode 40 are strip-shaped electrodes. The orthographic projection of the first electrode 30 on the first substrate 10 and the orthographic projection of the second electrode 40 on the first substrate 10 are staggered.

[0081] Further, in some embodiments, in the first mode, the pretilt angle A is the angle between the major axis 511 of the liquid crystal molecule 51 in the liquid crystal layer 50 and the normal direction F of the first substrate 10, and the pretilt angle A is greater than zero degrees and less than or equal to 15 degrees. Specifically, in the first mode, the pretilt angle A is 5 degrees, 7 degrees, or 10 degrees.

[0082] The privacy film 100 and display device 200 provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A privacy film, characterized in that, include: First substrate; Second substrate; A liquid crystal layer is disposed between the first substrate and the second substrate; The liquid crystal layer includes a polymer network and liquid crystal molecules distributed in the polymer network; First electrode; The second electrode and the first electrode are disposed on the same side or different sides of the liquid crystal layer, and at least one of the second electrode and the first electrode includes a strip electrode. In the first mode, no voltage is applied to the second electrode and the first electrode, the liquid crystal molecules of the liquid crystal layer have a pretilt angle, and the privacy film is in a privacy state; in the second mode, voltage is applied to the second electrode and the first electrode, the liquid crystal layer diffracts incident light perpendicular to the plane of the first substrate, and the privacy film is in a sharing state. In the first mode, the pretilt angle is greater than zero degrees and less than or equal to 15 degrees; The electrical anisotropy of the liquid crystal molecules in the liquid crystal layer is greater than or equal to 7 and less than or equal to 15.

2. The optical anisotropy of the liquid crystal molecules in the liquid crystal layer is greater than or equal to 2 and less than or equal to 3.

2. The privacy film according to claim 1, characterized in that, At least one of the second electrode and the first electrode includes at least two strip electrodes, which are arranged at intervals.

3. The privacy film according to claim 2, characterized in that, The ratio of the length of the strip electrode perpendicular to its extension direction to the spacing between adjacent strip electrodes perpendicular to their extension direction is greater than or equal to 0.7 and less than or equal to 0.

78.

4. The privacy film according to claim 1, characterized in that, The first electrode is disposed on the side of the first substrate near the liquid crystal layer, the second electrode is disposed on the side of the first electrode near the liquid crystal layer, and an insulating layer is provided between the second electrode and the first electrode.

5. The privacy film according to claim 4, characterized in that... The pretilt angle is the angle between the long axis of the liquid crystal molecules in the liquid crystal layer and the extension direction of the strip electrode.

6. The privacy film according to claim 4, characterized in that, The first electrode is a full-surface electrode, and the second electrode is a strip electrode.

7. The privacy film according to claim 4, characterized in that, Both the first electrode and the second electrode are strip-shaped electrodes, and the orthographic projections of the first electrode and the second electrode on the first substrate are staggered.

8. The privacy film according to claim 1, characterized in that, The first electrode is disposed on the side of the first substrate close to the liquid crystal layer, and the second electrode is disposed on the side of the second substrate close to the liquid crystal layer. Both the first electrode and the second electrode are strip-shaped electrodes, and the orthographic projections of the first electrode and the second electrode on the first substrate are staggered.

9. The privacy film according to claim 8, characterized in that, In the first mode, the pretilt angle is the angle between the long axis of the liquid crystal molecules in the liquid crystal layer and the normal direction of the first substrate.

10. A display device, characterized in that, include: The privacy film according to any one of claims 1 to 9; First polarizer; Second polarizer; The display panel is disposed between the first polarizer and the second polarizer; The privacy film is positioned on the side of the first polarizer away from the display panel.

11. The display device according to claim 10, characterized in that, The display device further includes: Collimated light source; A light guide plate is disposed on the side of the privacy film away from the display panel, and the collimating light source is disposed on one side of the light guide plate.

12. The display device according to claim 10, characterized in that, The display device further includes: Backlight source; A light guide plate is provided on the side of the privacy film away from the display panel, and a backlight source is provided on one side of the light guide plate. A collimation film is provided between the backlight source and the light guide plate.

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