Privacy film and display terminal

Abstract

An embodiment of the present application provides an anti-peep film and a display terminal. The display terminal includes a display panel, a backlight module, and an anti-peep film. The anti-peep film is located between the display panel and the backlight module. The anti-peep film includes a substrate and multiple dimming elements. The substrate is provided with multiple grooves, and two adjacent grooves are arranged at intervals; one dimming element is arranged corresponding to one groove. The dimming element includes a dimming layer and a first transparent electrode layer and a second transparent electrode layer arranged on both sides of the dimming layer. By setting the refractive index of the dimming layer to be positively correlated with the electric field strength between the first transparent electrode layer and the second transparent electrode layer, and the minimum refractive index of the dimming layer is greater than the refractive index of the substrate, the propagation direction of the light emitted by the backlight module into the dimming layer can be controlled by controlling the refractive index of the dimming layer, thereby realizing switching between wide and narrow viewing angles of the display terminal.

Description

Technical Field

[0001] The present invention belongs to the field of display technology, and in particular relates to an anti-peep film and a display terminal. Background Art

[0002] In the rapidly developing information age, people are increasingly concerned about protecting their personal information. Consequently, a new type of monitor with anti-peeping functionality has emerged. These monitors only allow the display to be readable to users facing straight ahead, while obscuring the display to bystanders at the side, effectively protecting user privacy.

[0003] Currently, the main method for achieving wide and narrow viewing angle switching is to use the electrically transparent and electrically scattering properties of polymer dispersed liquid crystal (PDLC) to convert the display between anti-peeping mode and shared mode. This anti-peeping technology will block or absorb some of the oblique light from the backlight, resulting in increased module power consumption and heat generation under the same screen brightness conditions. Summary of the Invention

[0004] The embodiments of the present application provide an anti-peep film and a display terminal to alleviate the deficiencies in the related art.

[0005] To achieve the above functions, the technical solutions provided in the embodiments of the present application are as follows:

[0006] The present invention provides an anti-peep film, comprising:

[0007] The base is provided with a plurality of grooves, and two adjacent grooves are spaced apart;

[0008] A plurality of dimming elements, each dimming element is arranged corresponding to each groove, and each dimming element includes a dimming layer and a first transparent electrode layer and a second transparent electrode layer arranged on both sides of the dimming layer;

[0009] The refractive index of the dimming layer is positively correlated with the electric field intensity between the first transparent electrode layer and the second transparent electrode layer, and the minimum refractive index of the dimming layer is greater than the refractive index of the substrate.

[0010] Optionally, in one embodiment, when the electric field intensity between the first transparent electrode layer and the second transparent electrode layer is configured to be 0 or no electric field is configured, the dimming layer has a first refractive index; when the electric field intensity between the first transparent electrode layer and the second transparent electrode layer is configured to be non-zero, the dimming layer has a second refractive index;

[0011] The anti-peeping angle and the refractive index of the dimming layer satisfy the following formula:

[0012] and

[0013] Wherein, θ1ˋ is the anti-peeping angle, n1 is the refractive index of the substrate, n2 is the first refractive index of the dimming layer, and n 2i is the second refractive index of the dimming layer.

[0014] Optionally, in one embodiment, the refractive index of the substrate is greater than or equal to 1.45 and less than or equal to 1.8.

[0015] Optionally, in one embodiment, the privacy protection angle and the depth of the groove satisfy the following formula:

[0016]

[0017] Wherein, d is the depth of the groove, and w is the width of the groove.

[0018] Optionally, in one embodiment, the privacy protection angle and the distance between adjacent grooves satisfy the following formula:

[0019]

[0020] Wherein, s is the distance between adjacent grooves, and w is the width of the groove.

[0021] Optionally, in one embodiment, the width of the groove is greater than 0 and less than or equal to 1000 microns.

[0022] Optionally, in one embodiment, the privacy film further includes:

[0023] a spacer, disposed between two adjacent grooves;

[0024] The reflective layer is disposed on the spacer, and the orthographic projection of the reflective layer on the substrate covers the spacer.

[0025] Optionally, in one embodiment, the first transparent electrode layer is provided on a side of the dimming layer away from the second transparent electrode, and a side of the reflective layer away from the substrate is flush with a side of the first transparent electrode layer away from the substrate.

[0026] Optionally, in one embodiment, the dimming layers and the spacers are alternately arranged along the first direction, and both the dimming layers and the spacers extend along the second direction;

[0027] Wherein, the first direction and the second direction form a preset angle.

[0028] An embodiment of the present application further provides a display terminal, comprising a display panel, a backlight module, and any of the above-mentioned privacy films; wherein the privacy film is located between the display panel and the backlight module.

[0029] Beneficial effects of the embodiments of the present application: The present application provides an anti-peep film and a display terminal, wherein the display terminal includes a display panel, a backlight module and an anti-peep film, wherein the anti-peep film is located between the display panel and the backlight module, and the anti-peep film includes a substrate and a plurality of dimming elements, wherein the substrate is provided with a plurality of grooves, and two adjacent grooves are arranged at intervals, and one dimming element is arranged corresponding to one groove, and the dimming element includes a dimming layer and a first transparent electrode layer and a second transparent electrode layer arranged on both sides of the dimming layer; by setting the refractive index of the dimming layer to be positively correlated with the electric field strength between the first transparent electrode layer and the second transparent electrode layer, and the minimum refractive index of the dimming layer is greater than the refractive index of the substrate, the propagation direction of the light emitted by the backlight module into the dimming layer is controlled by controlling the refractive index of the dimming layer, thereby realizing the switching between the wide viewing angle and the narrow viewing angle of the display terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure of a display terminal provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of the privacy film provided in an embodiment of the present application;

[0033] Figure 3 A top view of the privacy film provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of a backlight path of a display terminal provided in an embodiment of the present application configured in a first display mode;

[0035] Figure 5 A schematic diagram of the backlight path of the display terminal provided in an embodiment of the present application configured in the second display mode. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described 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, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the actual use or working mode of the device, specifically the direction of the drawings in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only, and features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; or communication between them; direct or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] The disclosure below provides many different embodiments for realizing the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present application. In addition, the examples of various specific processes and materials provided in the present application, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0040] The embodiments of the present application provide a privacy film and a display terminal. These are described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments.

[0041] Please combine Figure 1 and Figure 2 ;in, Figure 1 A schematic diagram of the structure of a display terminal provided in an embodiment of the present application; Figure 2 This is a schematic structural diagram of the privacy film 20 provided in an embodiment of the present application.

[0042] This embodiment provides a display terminal 1, which includes a display panel 10, a backlight module 30 and an anti-peep film 20; wherein the anti-peep film 20 is located between the display panel 10 and the backlight module 30, and the anti-peep film 20 can be attached to the display panel 10 by glue.

[0043] The display terminal 1 is configured to a first display mode and a second display mode, and the light emitting angle of the display terminal 1 when configured in the second display mode is smaller than the light emitting angle of the display terminal 1 when configured in the first display mode; it should be noted that, in this embodiment, the technical solution of the present application is illustrated by taking the first display mode as a normal display mode and the second display mode as an anti-peeping mode as an example.

[0044] Optionally, in specific applications, the display terminal 1 can be any product or component with a display function, such as a smart phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc., and the display panel 10 can be a light-emitting diode display panel (Light-Emitting Diode, LED), which is not specifically limited in this embodiment.

[0045] Furthermore, the privacy film 20 includes a substrate 21 and a plurality of dimming elements 22, the substrate 21 is provided with a plurality of grooves 211, two adjacent grooves 211 are arranged at intervals, and one dimming element 22 is arranged corresponding to one groove 211, and the dimming element 22 includes a dimming layer 221 and a first transparent electrode layer 222 and a second transparent electrode layer 223 arranged on both sides of the dimming layer 221; wherein the refractive index of the dimming layer 221 is positively correlated with the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223, and the minimum refractive index of the dimming layer 221 is greater than the refractive index of the substrate 21.

[0046] It should be noted that currently, the display's anti-peeping mode and shared mode are usually converted by utilizing the electrically transparent and power-off scattering properties of polymer dispersed liquid crystal (PDLC), or by adding a grating-like device outside the display panel or inside the backlight module to achieve panel anti-peeping through tiny and dense gratings. This type of anti-peeping technology will cause a portion of the oblique light from the backlight to be blocked or absorbed, reducing the utilization rate of the light emitted by the backlight, thereby causing problems such as increased module power consumption and heat generation.

[0047] It can be understood that this embodiment sets the refractive index of the dimming layer to be positively correlated with the electric field strength between the first transparent electrode layer and the second transparent electrode layer, and the minimum refractive index of the dimming layer is greater than the refractive index of the substrate, thereby controlling the refractive index of the dimming layer to control the propagation direction of the light emitted by the backlight module into the dimming layer, thereby achieving switching between wide viewing angle and narrow viewing angle of the display terminal.

[0048] Please combine Figure 1 、 Figure 2 and Figure 3 ; wherein, Figure 3 This is a top view of the privacy film provided in an embodiment of the present application.

[0049] In one embodiment, the material of the substrate 21 includes but is not limited to at least one of acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, polyurethane resin, cellulose resin, silicone resin, polyimide resin, polyamide resin, and quartz glass, and this embodiment does not impose any specific restrictions on this.

[0050] The dimming element 22 includes a dimming layer 221 and a first transparent electrode layer 222 and a second transparent electrode layer 223 arranged on both sides of the dimming layer 221. The materials of the first transparent electrode layer 222 and the second transparent electrode layer 223 include but are not limited to transparent electrode materials such as indium zinc oxide (IZO), indium tin oxide (ITO), zinc oxide (ZnO) or indium oxide (In2O3).

[0051] Optionally, the first transparent electrode layer 222 is arranged on a side of the dimming layer 221 away from the second transparent electrode layer 223, and the second transparent electrode layer 223 and the dimming layer 221 are both located in the groove 211; wherein, the first transparent electrode layer 222 includes a plurality of first electrodes 222A arranged at intervals, and the second transparent electrode layer 223 includes a plurality of second electrodes 223A arranged at intervals, one first electrode 222A, one dimming layer 221, and one second electrode 223A are arranged correspondingly, and the orthographic projection of the dimming layer 221 on the substrate 21 covers the orthographic projection of the second electrode 223A on the substrate 21, and the orthographic projection of the first electrode 222A on the substrate 21 covers the orthographic projection of the dimming layer 221 on the substrate 21.

[0052] Optionally, the material of the dimming layer 221 includes but is not limited to one or more of ammonium dihydrogen phosphate (ADP), potassium dideuterium phosphate (KDP), lithium niobate (LiNbO3), lithium tantalate (LiTaO3) or gallium arsenide (GaAs).

[0053] In one embodiment, when the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be 0 or no electric field is configured, the dimming layer 221 has a first refractive index n2; when the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be non-zero, the dimming layer 221 has a second refractive index n2. 2i .

[0054] Specifically, a high potential may be applied to one of the first electrode 222A and the second electrode 223A, and a low potential may be applied to the other of the first electrode 222A and the second electrode 223A, so that an electric field is formed between the first electrode 222A and the second electrode 223A. Under the action of the electric field, the refractive index of the dimming layer 221 changes from the first refractive index n2 to the second refractive index n 2i .

[0055] In one embodiment, the privacy film 20 further includes a spacer 212 and a reflective layer 23, the spacer 212 being disposed between two adjacent grooves 211, the dimming layer 221 and the spacer 212 being alternately arranged along a first direction X, and the dimming layer 221 and the spacer 212 both extending along a second direction Y; wherein the first direction X and the second direction Y form a preset angle. It will be understood that this embodiment takes the first direction as the X direction, the second direction as the Y direction, and the preset angle as a right angle as an example to illustrate the technical solution of the present application.

[0056] The reflective layer 23 is arranged on the spacer 212, and the orthographic projection of the reflective layer 23 on the substrate 21 covers the spacer 212; specifically, the reflective layer 23 includes a plurality of reflective portions 231 arranged at intervals, and one reflective portion 231 is arranged corresponding to one spacer 212; wherein, one reflective portion 231 is arranged between two adjacent first electrodes 222A, and the orthographic projection of the reflective portion 231 on the substrate 21 covers the orthographic projection of the spacer 212 on the substrate 21, and the orthographic projection of the reflective portion 231 on the substrate 21 does not overlap with the orthographic projection of the dimming element 22 on the substrate 21.

[0057] It can be understood that in this embodiment, a reflecting portion 231 is provided corresponding to a spacer portion 212; a reflecting portion 231 is provided between two adjacent first electrodes 222A, and the orthographic projection of the reflecting portion 231 on the substrate 21 covers the orthographic projection of the spacer portion 212 on the substrate 21. The reflecting portion 231 is used to reflect the light entering the spacer portion 212 along the dimming layer 221 in a direction close to the backlight module 30, and the light that is not used outside the viewing angle can be recovered and utilized, thereby reducing the light loss caused by the anti-peep film 20 to achieve a brightening effect.

[0058] Optionally, in one embodiment, a side of the reflective layer 23 away from the substrate 21 is flush with a side of the first transparent electrode layer 222 away from the substrate 21 , thereby maintaining the flatness of the privacy film 20 .

[0059] Furthermore, please combine Figure 4 and Figure 5 ;in, Figure 4 A schematic diagram of a backlight path of a display terminal provided in an embodiment of the present application configured in a first display mode; Figure 5 A schematic diagram of the backlight path of the display terminal provided in an embodiment of the present application configured in the second display mode.

[0060] In one embodiment, when the display terminal 1 is configured in the first display mode, the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be 0 or no electric field is configured, and the dimming layer 221 has a first refractive index n2; when the display terminal 1 is configured in the second display mode, the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be non-zero, and the dimming layer 221 has a second refractive index n 2i .

[0061] Specifically, when the display terminal 1 is configured in the first display mode, the electric field intensity between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be 0 or no electric field is configured, the dimming layer 221 has a first refractive index n2, and the incident light L1 emitted from the backlight module 30 has a first incident angle α when it is emitted to the substrate 21. After the incident light L1 passes through the substrate 21, the second transparent electrode layer 223 and the dimming layer 221, the incident light L1 is refracted, and when it is emitted from the dimming layer 221 to the side wall of the spacer 212, the incident light L1 has a second incident angle θ1. When the second incident angle θ1 is greater than the critical angle of total reflection between the dimming layer 221 and the substrate 21, the incident light L1 is totally reflected between the dimming layer 221 and the spacer 212, and after multiple reflections, it is emitted from the first transparent electrode layer 222 to the display panel 10. At this time, the viewing angle of the display terminal 1 is ω1, as shown in FIG. Figure 4 shown.

[0062] When the display terminal 1 is configured in the second display mode, the electric field intensity between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be non-zero, and the dimming layer 221 has a second refractive index n 2i , the incident light L1 emitted from the backlight module 30 has a first incident angle α when it is emitted to the substrate 21. After the incident light L1 passes through the substrate 21, the second transparent electrode layer 223 and the dimming layer 221, the incident light L1 is refracted. When the incident light L1 is emitted from the dimming layer 221 to the side wall of the partition 212, the incident light L1 has a second incident angle θ1. When the second incident angle θ1 is less than the critical angle of total reflection between the dimming layer 221 and the substrate 21, the incident light L1 is reflected and refracted between the dimming layer 221 and the partition 212. Wherein, after multiple reflections, the reflected light is emitted from the first transparent electrode layer 222 to the display panel 10, and the refracted light is emitted to the reflective layer 23 and reflected on the reflective layer 23 in a direction close to the backlight module 30. At this time, the viewing angle of the display terminal 1 is ω2, and the anti-peep angle of the display terminal 1 is θ1ˋ. Figure 5 shown.

[0063] Specifically, the display terminal 1 is configured in a first display mode and a second display mode, and the viewing angle ω2 of the display terminal 1 configured in the second display mode is smaller than the viewing angle ω1 of the display terminal 1 configured in the first display mode.

[0064] Combine Figure 4 and Figure 5It can be seen that in this embodiment, an electric field is formed between the first electrode 222A and the second electrode 223A, and the refractive index of the dimming layer 221 changes under the action of the electric field, thereby changing the incident angle of the incident light L1 emitted by the backlight module 30 when the dimming layer 221 enters the side wall of the spacer 212. By controlling the relationship between the incident angle of the incident light L1 and the critical angle of total reflection between the dimming layer 221 and the spacer 212, the wide viewing angle and narrow viewing angle of the display terminal 1 are switched. At the same time, compared with the related art, in which a grating-like device is added outside the display panel 10 or inside the backlight module 30 to achieve panel privacy protection, the design provided in this embodiment does not block or absorb the oblique light emitted from the backlight, thereby improving the utilization rate of the light emitted by the backlight and reducing the power consumption of the display terminal 1.

[0065] Furthermore, in one embodiment, the anti-peeping angle θ1 and the refractive index of the dimming layer 221 satisfy the following formula:

[0066] and

[0067]

[0068] Wherein, θ1 is the anti-peeping angle, n1 is the refractive index of the substrate 21, n2 is the first refractive index of the dimming layer 221, and n 2i is the second refractive index of the light-adjusting layer 221 .

[0069] Specifically, the refractive index of the substrate 21 is greater than or equal to 1.45 and less than or equal to 1.8; it can be understood that this embodiment can control the refractive index of the dimming layer 221 to control the incident angle of the light emitted by the backlight module 30 into the dimming layer 221 and the relationship between the critical angle of total reflection between the dimming layer 221 and the spacer 212, thereby realizing the switching between wide viewing angle and narrow viewing angle of the display terminal 1.

[0070] According to the above formulas (1) and (2), the required second refractive index n of the dimming layer 221 is 2i It can be obtained by the refractive index n1 of the substrate 21 and the anti-peep angle θ1. Therefore, in this embodiment, the first refractive index n2 of the light-adjusting layer 221 and the second refractive index n2 of the light-adjusting layer 221 are 2i There is no specific restriction, and the size can be selected according to the actual required anti-peeping angle.

[0071] Furthermore, the anti-peeping angle and the depth of the groove 211 satisfy the following formula:

[0072]

[0073] Wherein, d is the depth of the groove 211, and w is the width of the groove 211; optionally, the width of the groove 211 is greater than 0 and less than or equal to 1000 microns.

[0074] The anti-peep angle and the distance between adjacent grooves 211 satisfy the following formula:

[0075]

[0076] Wherein, s is the distance between adjacent grooves 211 , and w is the width of the groove 211 .

[0077] Specifically, in this embodiment, the width w of the groove 211 and the spacing s between adjacent grooves 211 can be designed according to the above formulas (3) and (4). Therefore, this embodiment does not impose specific restrictions on the depth of the groove 211, the width w of the groove 211, and the spacing s between adjacent grooves 211, and their sizes can be designed according to actual needs.

[0078] Combine as follows Figure 4 、 Figure 5 The anti-peep film 20 in the display terminal 1 provided in the embodiment of the present invention is further described with reference to specific experimental data.

[0079] A privacy film 20 is provided, comprising a substrate 21 and a plurality of dimming elements 22. The substrate 21 is made of polyether resin and has a refractive index of 1.737. The substrate 21 is provided with a plurality of grooves 211, with two adjacent grooves 211 spaced apart. The grooves 211 are 100 microns wide, 270 microns deep, and 210 microns apart. One dimming element 22 is provided corresponding to each groove 211. The dimming element 22 comprises a dimming layer 221 and a first transparent electrode layer 222 and a second transparent electrode layer 223 disposed on either side of the dimming layer 221. The dimming layer 221 is made of lithium niobate crystal.

[0080] When the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be 0 or no electric field is configured, the dimming layer 221 has a first refractive index n2, which is 2.2866; when the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be non-zero, the dimming layer 221 has a second refractive index n2. 2i , the second refractive index n 2i The first refractive index n2 satisfies the following formula:

[0081] n2i =n2+aE (5);

[0082] Wherein, n2 is the first refractive index of the dimming layer 221, n 2i is the second refractive index n of the light-adjusting layer 221 2i , a is the electro-optic coefficient of the dimming layer 221 , and E is the electric field intensity between the first transparent electrode layer 222 and the second transparent electrode layer 223 .

[0083] like Figure 4 As shown, when the display terminal 1 is configured in the first display mode, the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be 0 or no electric field is configured, the dimming layer 221 has a first refractive index n2, and the first refractive index n2 is 2.2866. The incident light L1 emitted from the backlight module 30 has a first incident angle α when it is emitted to the substrate 21. When the incident light L1 passes through the substrate 21, the second transparent electrode layer 223 and the dimming layer 221, the incident light L1 is refracted and is emitted from the dimming layer 221 to the intermediate layer 21. When the incident light L1 touches the side wall of the partition 212, the incident light L1 has a second incident angle θ1; wherein the first incident angle α is 75 degrees, the second incident angle θ1 is 65 degrees, the critical angle of total reflection between the dimming layer 221 and the substrate 21 is 49.43 degrees, and the second incident angle θ1 is greater than the critical angle of total reflection between the dimming layer 221 and the substrate 21. The incident light L1 is totally reflected between the dimming layer 221 and the partition 212, and after multiple reflections, it is emitted from the first transparent electrode layer 222 to the display panel 10. At this time, the viewing angle of the display terminal 1 is ω1, and ω1 is 75 degrees.

[0084] like Figure 5 As shown, when the display terminal 1 is configured in the second display mode, the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be non-zero, and the dimming layer 221 has a second refractive index n 2i , the second refractive index n 2iis 1.85, and the incident light L1 emitted from the backlight module 30 has a first incident angle α when it is emitted to the substrate 21. When the incident light L1 passes through the substrate 21, the second transparent electrode layer 223 and the dimming layer 221, the incident light L1 is refracted, and when it is incident on the side wall of the spacer 212 from the dimming layer 221, the incident light L1 has a second incident angle θ1; wherein, the first incident angle α is 75 degrees, the second incident angle θ1 is 58.53 degrees, the critical angle for total reflection between the dimming layer 221 and the substrate 21 is 69.87 degrees, the second incident angle θ1 is less than the critical angle for total reflection between the dimming layer 221 and the substrate 21, the incident light L1 is reflected and refracted between the dimming layer 221 and the spacer 212, and at this time, the viewing angle of the display terminal 1 is ω2, and ω2 is 65 degrees.

[0085] Combine Figure 4 、 Figure 5 As can be seen from specific experimental data, in the display terminal 1 provided in the embodiment of the present invention, the propagation direction of the light emitted by the backlight module 30 into the dimming layer 221 is controlled by controlling the refractive index of the dimming layer 221; wherein, the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be 0 or not configured with an electric field, the dimming layer 221 has a first refractive index, and the display terminal 1 has a wide viewing angle effect; wherein the electric field strength between the first transparent electrode layer 222 and the second transparent electrode layer 223 is configured to be non-zero, the dimming layer 221 has a second refractive index, and the display terminal 1 has a narrow viewing angle effect.

[0086] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] The above is a detailed introduction to an anti-peep film and a display terminal provided in the embodiments of the present application. 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 solutions and core ideas 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 cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A privacy film, characterized in that: include: The base is provided with a plurality of grooves, and two adjacent grooves are spaced apart; a plurality of dimming elements, each dimming element being disposed corresponding to each groove, the dimming element comprising a dimming layer and a first transparent electrode layer and a second transparent electrode layer disposed on both sides of the dimming layer, the refractive index of the dimming layer being positively correlated with the electric field strength between the first transparent electrode layer and the second transparent electrode layer, and the minimum refractive index of the dimming layer being greater than the refractive index of the substrate; Wherein, when the electric field strength between the first transparent electrode layer and the second transparent electrode layer is configured to be 0 or no electric field is configured, the dimming layer has a first refractive index; when the electric field strength between the first transparent electrode layer and the second transparent electrode layer is configured to be non-zero, the dimming layer has a second refractive index; The anti-peeping angle and the refractive index of the dimming layer satisfy the following formula: Wherein, θ1' is the anti-peeping angle, n1 is the refractive index of the substrate, n2 is the first refractive index of the dimming layer, and n 2i is the second refractive index of the dimming layer.

2. The privacy film according to claim 1, wherein: The refractive index of the substrate is greater than or equal to 1.45 and less than or equal to 1.

8.

3. The privacy film according to claim 1, wherein: The anti-peep angle and the depth of the groove satisfy the following formula: Wherein, d is the depth of the groove, and w is the width of the groove.

4. The privacy film according to claim 1, wherein: The anti-peep angle and the distance between adjacent grooves satisfy the following formula: Wherein, s is the distance between adjacent grooves, and w is the width of the groove.

5. The privacy film according to any one of claims 1 to 4, characterized in that: The width of the groove is greater than 0 and less than or equal to 1000 micrometers.

6. The privacy film according to claim 1, wherein: The privacy film further comprises: a spacer, disposed between two adjacent grooves; The reflective layer is disposed on the spacer, and the orthographic projection of the reflective layer on the substrate covers the spacer.

7. The privacy film according to claim 6, characterized in that: The first transparent electrode layer is provided on a side of the dimming layer away from the second transparent electrode layer, and a side of the reflective layer away from the substrate is flush with a side of the first transparent electrode layer away from the substrate.

8. The privacy film according to claim 6, characterized in that: The dimming layers and the spacers are alternately arranged along a first direction, and both the dimming layers and the spacers extend along a second direction; Wherein, the first direction and the second direction form a preset angle.

9. A display terminal, characterized in that: The device comprises a display body, a backlight module and the privacy film according to any one of claims 1 to 8; wherein the privacy film is located between the display body and the backlight module.

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