Privacy film and display device

Abstract

A privacy film (80) and a display device (200). The display device (200) comprises: a display panel (100); and a privacy film (80) arranged on a light exiting side of the display panel (100), the privacy film (80) comprising a composite privacy film layer (81), and the composite privacy film layer (81) comprising a first film layer (B) and a second film layer (A) which are stacked, wherein the first film layer (B) and the second film layer (A) each comprise a plurality of protrusions (B1, A1) and a plurality of recesses (B2, A2) on a contact interface, and the protrusions (B1) and the recesses (B2) of the first film layer (B) are in snap-fit to the recesses (A2) and the protrusions (A1) of the second film layer (A), respectively.

Description

Privacy film and display device Technical Field

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

[0002] Display devices have been widely used in people's lives, such as display screens of mobile phones, computers, e-books, etc. With the increasing popularity and application of display devices, users are paying more and more attention to the protection of personal information, and the concept of anti-peeping has gradually been valued by users.

[0003] However, current anti-peeping display devices have the problem of poor anti-peeping effect. SUMMARY OF THE INVENTION

[0004] The purpose of this application is to provide an anti-peeping film and a display device, aiming to solve the problem that the current anti-peeping display device has a poor anti-peeping effect.

[0005] The present application provides an anti-peeping film and a display device, which can solve the problem of poor anti-peeping effect of current anti-peeping display devices.

[0006] In one aspect, the present application provides a privacy film, comprising:

[0007] At least one anti-peeping composite film layer is stacked, the anti-peeping composite film layer comprising a first film layer and a second film layer stacked;

[0008] The absolute value of the difference between the refractive index of the first film layer and the second film layer in the first direction is less than or equal to 0.1, the refractive index of the first film layer and the second film layer in the first direction are both lower than the refractive index of the first film layer in the second direction, the refractive index of the first film layer and the second film layer in the first direction are both higher than the refractive index of the second film layer in the second direction, and the first direction and the second direction are perpendicular and both are located on the plane where the anti-peep composite film layer is located;

[0009] The first film layer and the second film layer both include a plurality of protrusions and a plurality of depressions at the contact interface, and the protrusions and depressions of the first film layer are matched and engaged with the depressions and protrusions of the second film layer respectively.

[0010] In another aspect, the present application provides a display device, comprising:

[0011] a display panel, the display panel emitting polarized light;

[0012] an anti-peep film disposed on the light-emitting side of the display panel, the anti-peep film comprising at least one anti-peep composite film layer stacked with the display panel in the thickness direction of the display panel, the anti-peep composite film layer comprising a first film layer and a second film layer stacked, the second film layer being located on a side of the first film layer away from the display panel;

[0013] The absolute value of the difference between the refractive index of the first film layer and the second film layer in the first direction is less than or equal to 0.1, the refractive index of the first film layer and the second film layer in the first direction are both lower than the refractive index of the first film layer in the second direction, the refractive index of the first film layer and the second film layer in the first direction are both higher than the refractive index of the second film layer in the second direction, and the first direction and the second direction are perpendicular and both are located on the plane where the anti-peep composite film layer is located;

[0014] The first film layer and the second film layer both include a plurality of protrusions and a plurality of depressions at the contact interface, and the protrusions and depressions of the first film layer are matched and engaged with the depressions and protrusions of the second film layer respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic top view of the structure of a first privacy film provided in Example 1 of the present application;

[0016] FIG2 is a cross-sectional structure of CC in FIG1 and a schematic diagram of the first light;

[0017] FIG3 is a schematic diagram of the cross-sectional structure of DD and the second light in FIG1 ;

[0018] FIG4 is a cross-sectional structure of CC in FIG1 and a schematic diagram of the first light;

[0019] FIG5 is a schematic diagram of the cross-sectional structure of DD and the second light in FIG1 ;

[0020] FIG6 is a schematic top view of the structure of the first privacy film provided in Example 2 of the present application;

[0021] FIG7 is a schematic diagram of a privacy film provided in Example 3 of the present application;

[0022] FIG8 is a schematic cross-sectional view of a first display device provided in Example 4 of the present application;

[0023] FIG9 is a schematic diagram of the operation of the first display device in the anti-peeping state provided in the fifth embodiment of the present application;

[0024] FIG10 is a schematic diagram of the operation of the first display device in a non-peeping state provided in the fifth embodiment of the present application. Modes for Carrying Out the Invention

[0025] 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 device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0026] In one aspect, the present application provides a privacy film, comprising:

[0027] At least one anti-peeping composite film layer is stacked, the anti-peeping composite film layer comprising a first film layer and a second film layer stacked;

[0028] The absolute value of the difference between the refractive index of the first film layer and the second film layer in the first direction is less than or equal to 0.1, the refractive index of the first film layer and the second film layer in the first direction are both lower than the refractive index of the first film layer in the second direction, the refractive index of the first film layer and the second film layer in the first direction are both higher than the refractive index of the second film layer in the second direction, and the first direction and the second direction are perpendicular and both are located on the plane where the anti-peep composite film layer is located;

[0029] The first film layer and the second film layer both include a plurality of protrusions and a plurality of depressions at the contact interface, and the protrusions and depressions of the first film layer are matched and engaged with the depressions and protrusions of the second film layer respectively.

[0030] In another aspect, the present application provides a display device, comprising:

[0031] a display panel, the display panel emitting polarized light;

[0032] an anti-peep film disposed on the light-emitting side of the display panel, the anti-peep film comprising at least one anti-peep composite film layer stacked with the display panel in the thickness direction of the display panel, the anti-peep composite film layer comprising a first film layer and a second film layer stacked, the second film layer being located on a side of the first film layer away from the display panel;

[0033] The absolute value of the difference between the refractive index of the first film layer and the second film layer in the first direction is less than or equal to 0.1, the refractive index of the first film layer and the second film layer in the first direction are both lower than the refractive index of the first film layer in the second direction, the refractive index of the first film layer and the second film layer in the first direction are both higher than the refractive index of the second film layer in the second direction, and the first direction and the second direction are perpendicular and both are located on the plane where the anti-peep composite film layer is located;

[0034] The first film layer and the second film layer both include a plurality of protrusions and a plurality of depressions at the contact interface, and the protrusions and depressions of the first film layer are matched and engaged with the depressions and protrusions of the second film layer respectively.

[0035] In some embodiments of the present application, an absolute value of a difference between a refractive index of the first film layer in the second direction and a refractive index of the second film layer in the second direction is greater than or equal to 0.5.

[0036] In some embodiments of the present application, the protrusions of the first film layer are arranged in an array along the third direction and the fourth direction, and the recesses of the first film layer are alternately arranged between two adjacent protrusions along the third direction and the fourth direction.

[0037] In some embodiments of the present application, the third direction is the first direction, and the fourth direction is the second direction.

[0038] In some embodiments of the present application, the protrusions and depressions of the first film layer are arranged in a checkerboard pattern.

[0039] In some embodiments of the present application, in a direction parallel to the plane where the anti-peep composite film layer is located, the length of the protrusions on the first film layer ranges from 100 to 300 microns, and the length of the recesses on the first film layer ranges from 100 to 300 microns.

[0040] In some embodiments of the present application, the length of the protrusion on the first film layer in the fourth direction is greater than the length of the protrusion in the third direction.

[0041] In some embodiments of the present application, the display panel includes:

[0042] Display panel body;

[0043] A polarizer is disposed between the display panel body and the privacy film, and the polarizer is adjacent to the display panel body and the privacy film, and a transmission axis of the polarizer is parallel to the second direction.

[0044] In some embodiments of the present application, the display panel includes:

[0045] Display panel body;

[0046] a polarizer, disposed between the display panel body and the privacy film, wherein a transmission axis of the polarizer is parallel to the first direction or the second direction;

[0047] The polarized light adjustment layer includes an electrically controlled half-wave plate or a magnetically controlled optical rotation plate, and the polarized light adjustment layer is arranged between the polarizer and the anti-peep film.

[0048] In some embodiments of the present application, the electrically controlled half-wave plate includes:

[0049] a first substrate and a second substrate arranged opposite to each other,

[0050] a liquid crystal layer, disposed between the first substrate and the second substrate;

[0051] A plurality of electrodes are disposed between the first substrate and the second substrate, and the plurality of electrodes are used to adjust the rotation state of the liquid crystal in the liquid crystal layer.

[0052] Beneficial effects of the present application: The embodiments of the present application provide an anti-peep film and a display device, the display device comprising: a display panel, the display panel emitting polarized light; an anti-peep film, arranged on the light-emitting side of the display panel; the anti-peep film comprises at least one anti-peep composite film layer stacked with the display panel in the thickness direction of the display panel, the anti-peep composite film layer comprising a first film layer and a second film layer stacked, the second film layer being located on a side of the first film layer away from the display panel; the absolute value of the difference in refractive index between the first film layer and the second film layer in the first direction is less than or equal to 0.1, and the refractive index of the first film layer and the second film layer in the first direction is both less than the refractive index of the first film layer in the second direction The refractive index of the first film layer and the second film layer in the first direction is greater than the refractive index of the second film layer in the second direction (that is, the refractive index of the first film layer B in the first direction X is nxb, the refractive index of the second film layer A in the first direction X is nxa, the refractive index of the first film layer B in the second direction Y is nyb, and the refractive index of the second film layer A in the second direction Y is nya), the first direction and the second direction are perpendicular, and both are located on the plane where the anti-peek composite film layer is located; wherein the first film layer and the second film layer both include a plurality of protrusions and a plurality of recesses at the contact interface, and the protrusions and recesses of the first film layer are respectively matched and engaged with the recesses and protrusions of the second film layer. In the present application, 1) the polarization direction of the polarized light is set to be parallel to the second direction Y, that is, the polarized light in the second direction Y has a refractive index nyb when passing through the first film layer B, and has a refractive index nya when passing through the second film layer A structure, and nyb>nya. When viewed in the first direction X and the second direction, in the first film layer B, the polarized light in the second direction Y has a refractive index nyb, and in the second film layer A, the polarized light in the second direction Y has a refractive index nya. Because nyb>nya, there will be total reflection and refraction when entering the second film layer A from the first film layer B. At this time, the large-viewing angle light G1 is reflected or refracted, and the normal-viewing light G2 directly passes through the anti-peeping composite film layer, thereby realizing anti-peeping display. 2) When polarized light emitted by the display panel passes through the anti-peep composite film layer, the polarization direction of the polarized light is parallel to the first direction X when viewed in both the first direction X and the second direction Y. That is, polarized light in the first direction X has a refractive index nxb when passing through the structure of the first film layer B, and has a refractive index nxa when passing through the structure of the second film layer A. Because nxa is close to nxb or nxa = nxb, light in the first direction X passes directly through the interface between the first film layer B and the second film layer A, thereby achieving wide-viewing angle display. 3) Combining points 1) and 2) above, when the polarization direction of the display light emitted by the display panel or display device can be switched between the first direction X and the second direction X, switching between anti-peeping display mode and wide-viewing angle display mode can be achieved, allowing users to switch according to practical circumstances or needs.

[0053] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments.

[0054] Example 1

[0055] Please refer to Figures 1 to 5. Figure 1 is a schematic diagram of the top view of the first anti-peep film provided in Example 1 of the present application; Figure 2 is a schematic diagram of the cross-sectional structure of CC and the first light in Figure 1; Figure 3 is a schematic diagram of the cross-sectional structure of DD and the second light in Figure 1; Figure 4 is a schematic diagram of the cross-sectional structure of CC and the first light in Figure 1; Figure 5 is a schematic diagram of the cross-sectional structure of DD and the second light in Figure 1.

[0056] The present application provides a display device 200, which includes a display panel 100 and an anti-peep film 80. The display panel 100 emits polarized light; the anti-peep film 80 is arranged on the light-emitting side of the display panel 100; wherein the anti-peep film 80 includes at least one anti-peep composite film layer 81 stacked with the display panel 100 in the thickness direction of the display panel 100, and the anti-peep composite film layer 81 includes a first film layer B and a second film layer A stacked, and the second film layer A is located on the side of the first film layer B away from the display panel 100; the absolute value of the difference in refractive index between the first film layer B and the second film layer A in the first direction X is less than or equal to 0.1, and the first film layer B is disposed on the side of the display panel 100. The refractive index of layer B and the second film layer A in the first direction X is smaller than the refractive index of the first film layer B in the second direction Y, and the refractive index of the first film layer B and the second film layer A in the first direction X is greater than the refractive index of the second film layer A in the second direction Y. The first direction X and the second direction Y are perpendicular and are both located on the plane where the anti-peek composite film layer 81 is located; wherein, the first film layer B and the second film layer A both include multiple protrusions and multiple depressions at the contact interface, and the protrusions and depressions of the first film layer B are matched and engaged with the depressions and protrusions of the second film layer A, respectively.

[0057] Specifically, the privacy film 80 includes at least one privacy composite film layer 81 . FIG. 1 to FIG. 5 illustrate that the privacy film 80 includes one privacy composite film layer 81 .

[0058] Specifically, the privacy film 80 is disposed on the light-emitting side of the display panel 100 . The light-emitting side of the display panel 100 refers to a side or a surface of the display panel 100 from which display light is emitted.

[0059] Specifically, the anti-peep composite film layer 81 includes a stacked first film layer B and a second film layer A. The second film layer A is located on the side of the first film layer B away from the display panel 100. The display light emitted by the display panel 100 first passes through the first film layer B and then passes through the second film layer A.

[0060] Specifically, the refractive index of the first film layer B in the first direction X is nxb, the refractive index of the second film layer A in the first direction X is nxa, the refractive index of the first film layer B in the second direction Y is nyb, and the refractive index of the second film layer A in the second direction Y is nya.

[0061] Specifically, the absolute value of the difference in refractive index between the first film layer B and the second film layer A in the first direction X is less than or equal to 0.1, that is, the absolute value of the difference between nxb and nxa is greater than or equal to 0 and less than or equal to 0.1.

[0062] Optionally, the first film layer B and the second film layer A have the same refractive index in the first direction X, that is, nxb=nxa.

[0063] Specifically, the refractive indexes of the first film layer B and the second film layer A in the first direction X are both smaller than the refractive index of the first film layer B in the second direction Y, that is, nyb>nxb, nyb>nxa.

[0064] Specifically, the refractive indexes of the first film layer B and the second film layer A in the first direction X are both greater than the refractive index of the second film layer A in the second direction Y, that is, nxb>nya, nxa>nya.

[0065] Specifically, the refractive indexes of the first film layer B and the second film layer A in the first direction X are the same or similar, and the anti-peeping composite film layer 81 satisfies: nyb>nxa=nxb>nya, or nyb>nxa≈nxb>nya.

[0066] Specifically, the first direction X and the second direction Y are perpendicular to each other and are both located on the plane where the anti-peek composite film layer 81 is located.

[0067] Specifically, the first film layer B and the second film layer A both include multiple protrusions and multiple depressions at the contact interface, and the protrusions and depressions of the first film layer B are matched and engaged with the depressions and protrusions of the second film layer A, respectively. That is, in the cross-sectional view of Figure 1, the protrusions of the first film layer B are engaged with the depressions of the second film layer A, and the depressions of the first film layer B are engaged with the protrusions of the second film layer A.

[0068] Specifically, FIG1 to FIG5 illustrate that the protrusion and depression of the first film layer B are respectively the first protrusion B1 and the first depression B2, and the protrusion and depression of the second film layer A are respectively the second protrusion A1 and the second depression A2.

[0069] When the polarized light emitted by the display panel 100 passes through the anti-peek composite film layer 81, the polarization direction of the polarized light is set to be parallel to the second direction Y. That is, the polarized light in the second direction Y has a refractive index nyb when passing through the first film layer B, and has a refractive index nya when passing through the second film layer A structure, and nyb>nya.

[0070] As shown in Figure 2, when viewed in the first direction X, in the first film layer B, the polarized light in the second direction Y has a refractive index nyb, and in the second film layer A, the polarized light in the second direction Y has a refractive index nya. Because nyb>nya, there will be total reflection and refraction when entering the second film layer A from the first film layer B. At this time, total reflection and refraction occur at the interface between the first film layer B and the second film layer A in the first direction X, that is, total reflection and refraction occur at the side wall interface between the first protrusion B1 and the second protrusion A1 in the first direction X. Figure 2 illustrates that the wide-viewing angle light G1 is reflected or refracted, and the normal-viewing light G2 directly passes through the anti-peek composite film layer 81.

[0071] As shown in Figure 3, when viewed in the second direction Y, in the first film layer B, the polarized light in the second direction Y has a refractive index nyb, and in the second film layer A, it has a refractive index nya. Because nyb>nya, there will be total reflection and refraction when entering the second film layer A from the first film layer B. At this time, total reflection and refraction occur at the interface between the first film layer B and the second film layer A in the second direction Y, that is, total reflection and refraction occur at the side wall interface of the first protrusion B1 and the second protrusion A1 in the second direction Y. Figure 3 illustrates that the large-viewing angle light G1 is reflected or refracted, and the normal-viewing light G2 directly passes through the anti-peek composite film layer 81.

[0072] It should be noted that in Figures 2 and 3, regardless of whether the viewing direction is the first direction X or the second direction Y, the polarized light with the polarization direction in the second direction Y is parallel to the second direction Y of the second film layer A and the first film layer B, and does not change due to different viewing directions. As described above, the refractive indices in the second direction Y of the second film layer A and the first film layer B are nya and nyb, respectively. Therefore, when the polarized light passes through the interface between the second film layer A and the first film layer B, total internal reflection and refraction will occur. This does not matter whether the viewing angle is in the first direction X or the second direction Y, as long as it enters the interface of the first film layer A from the second film layer B, it will occur.

[0073] It should be noted that in Figures 2 and 3, the polarized light G1 with a wide viewing angle and an incident angle that satisfies the critical angle of total reflection θ=arcsin (nya / nyb) will undergo total reflection, causing the image information to be mirror-flipped and at the same time changing the propagation direction of the light, causing the image information of that part to be lost, and to shift and overlap with the image of other parts, interfering with the original image information, thereby blurring the side view image and distorting the image, making the picture difficult to identify, and achieving the purpose of preventing peeping.

[0074] Please refer to Figure 4. When the polarized light emitted by the display panel passes through the anti-peek composite film layer 81, the polarization direction of the polarized light is parallel to the first direction X. That is, the polarized light in the first direction X has a refractive index nxb when passing through the structure of the first film layer B, and has a refractive index nxa when passing through the structure of the second film layer A. Because nxa is close to nxb or nxa=nxb, the light in the first direction X passes directly through the interface between the first film layer B and the second film layer A. Similarly, as shown in Figure 5, when viewed in the second direction Y, the light in the first direction X passes directly through the interface between the first film layer B and the second film layer A.

[0075] It should be noted that in Figures 4 and 5, when the polarization direction of the polarized light is parallel to the first direction X and passes through the anti-peep composite film layer 81, since nxa=nxb, or nxa≈nxb, the propagation direction of the polarized light will not be disturbed, and the anti-peep composite film layer 81 will not affect the image information from the display panel 100.

[0076] Based on the above analysis, 1) as shown in Figures 2 and 3, anti-peeping display is achieved. 2) as shown in Figures 4 and 5, wide-viewing angle display is achieved. 3) Combining points 1) and 2) above, when the polarization direction of the display light emitted by the display panel or display device can be switched between a first direction X and a second direction Y, switching between an anti-peeping display mode and a wide-viewing angle display mode can be achieved, allowing users to switch between the two modes according to practical circumstances or needs.

[0077] In some embodiments, an absolute value of a difference between a refractive index of the first film layer B in the second direction Y and a refractive index of the second film layer A in the second direction Y is greater than or equal to 0.5.

[0078] Specifically, the absolute value of the difference between nyb and nya is greater than or equal to 0.5.

[0079] Specifically, the absolute value of the difference between nyb and nya is less than or equal to 0.7.

[0080] Specifically, when the polarization direction of the polarized light is parallel to the second direction Y, as shown in Figures 2 and 3, when passing through the anti-peep composite film layer 81, since nya<nyb, when the polarized light enters the second film layer A from the first film layer B, the polarized light whose incident angle satisfies the critical angle of total reflection θ=arcsin(nya / nyb) will undergo total reflection, and the absolute value of the difference between nyb and nya is in the range of 0.5-0.7, which can obtain a good anti-peep viewing angle.

[0081] In some embodiments, as shown in FIG. 1 to FIG. 5 , the protrusions of the first film layer B are arranged in an array along the third direction U and the fourth direction V, and the recesses of the first film layer B are alternately arranged between two adjacent protrusions along the third direction U and the fourth direction V.

[0082] Specifically, the protrusions of the first film layer B are arranged in an array along the third direction U and the fourth direction V, which can prevent the user from observing the pattern of protrusions and depressions when the protrusions and depressions of the first film layer B are arranged irregularly.

[0083] In some embodiments, as shown in FIG. 1 to FIG. 5 , the third direction U is the first direction X, and the fourth direction V is the second direction Y.

[0084] Specifically, when the polarization direction of the polarized light is the second direction Y, the total reflection that has an anti-peeping effect mainly occurs on the side wall of the protrusion of the first film layer B. The protrusion of the first film layer B is arranged in an array along the third direction U and the fourth direction V. The fourth direction V is the second direction Y, so that the side wall of the protrusion of the first film layer B extends along the first direction X and / or the second direction Y, which can increase the area of ​​total reflection and / or refraction, thereby better playing an anti-peeping role.

[0085] In some embodiments, as shown in FIG. 2 , the protrusions and depressions of the first film layer B are arranged in a checkerboard pattern.

[0086] Specifically, the protrusions and depressions of the first film layer B are arranged in a checkerboard pattern, and two adjacent protrusions in two adjacent rows on the first film layer B are arranged in contact with each other, so that the protrusions on the first film layer B that have an anti-peeping function are connected to each other, that is, the depressions on the first film layer B that do not have an anti-peeping function are disconnected from each other, thereby avoiding the existence of local areas on the display device that are not anti-peeping, and making the display device uniformly anti-peeping.

[0087] In some embodiments, the length of the protrusions on the first film layer B (the first length d1 in Figure 1 ) in a direction parallel to the plane where the privacy-preventing composite film layer 81 lies is in the range of 100-300 microns, and the length of the recesses in the first film layer B (the second length d2 in Figure 1 ) is in the range of 100-300 microns. This configuration prevents humans from recognizing the protrusions or recesses. The first length d1 is the maximum length of the protrusions on the first film layer B in the plane where the privacy-preventing composite film layer 81 lies, and the second length d2 is the maximum length of the recesses in the first film layer B in the plane where the privacy-preventing composite film layer 81 lies.

[0088] Furthermore, in a direction perpendicular to the plane of the anti-peep composite film layer 81, the height of the protrusions (h1, the first height in FIG. 1 ) and the depth of the depressions (h2, the second height in FIG. 1 ) on the first film layer B are also set to be in the range of 100-300 microns, which can prevent the user from recognizing the protrusions or depressions when looking from the side.

[0089] Example 2

[0090] Please refer to FIG6 , which is a schematic top view of the structure of the first privacy film provided in Example 2 of the present application.

[0091] The privacy-preventing composite film layer 81 in this embodiment is the same as or similar to the privacy-preventing composite film layer 81 in any one of the first embodiments, except that the protrusions on the first film layer B have a length in the fourth direction V that is greater than the length of the protrusions B1 in the third direction U. The similarities are not repeated here, and only the differences are described.

[0092] In some embodiments, the length of the protrusion on the first film layer B in the fourth direction V is greater than the length of the protrusion B1 in the third direction U.

[0093] Specifically, compared with the anti-peep composite film layer 81 of any one of the first embodiments, the interface between the first film layer B and the second film layer A that undergoes total reflection and refraction when viewed in the second direction Y in Figure 3 is reduced, so that when viewed in the second direction Y, the reflection or refraction of the wide-viewing angle light G1 is reduced, so that the display panel or display device has a better wide viewing angle when viewed in the second direction Y.

[0094] In some embodiments, preferably, the length of the protrusion on the first film layer B in the fourth direction V is equal to the length of the privacy film 80 in the fourth direction v.

[0095] Specifically, compared with the anti-peep composite film layer 81 of any one of the first embodiments, when viewed in the second direction Y, there is no interface between the first film layer B and the second film layer A that undergoes total reflection and refraction as shown in Figure 3, so that when viewed in the second direction Y, the wide-viewing angle light G1 passes directly through without reflection or refraction, so that the display panel or display device has a better wide viewing angle when viewed in the second direction Y.

[0096] In this embodiment, the second direction Y can be the up and down direction. When the user views, the second direction Y (for example, the up and down direction) has a good wide viewing angle, while the viewing angle in the first direction X is smaller than that in the first embodiment, which can further provide different practical requirements of the anti-peep composite film layer 81.

[0097] Example 3

[0098] The privacy film 80 in this embodiment includes a plurality of privacy composite film layers 81 . The privacy composite film layers 81 may be the privacy composite film layers 81 in any one of the first and second embodiments.

[0099] Please refer to FIG. 7 , which is a schematic diagram of an anti-peep film provided in Example 3 of the present application.

[0100] In some embodiments, as shown in Figure 7, the anti-peep film 80 includes multiple anti-peep composite film layers 81, which are stacked in the thickness direction of the display panel 100, and the second film layer A of each anti-peep composite film is located on the side of the first film layer B away from the display panel 100.

[0101] Specifically, the anti-peep film 80 includes multiple anti-peep composite film layers 81 , each of which can be independent of each other. Each anti-peep composite film layer 81 plays an anti-peep role, further improving the anti-peep effect.

[0102] Specifically, the anti-peep film 80 includes multiple anti-peep composite film layers 81, which can better play an anti-peep role, that is, multiple anti-peep composite film layers 81 can cause the image information to be mirror-flipped and at the same time change the propagation direction of light, so that the image information of this part is lost, and the image information of this part is shifted and overlapped with the image of other parts, interfering with the original image information, thereby achieving the effect of blurring the side view image and distorting the image, making the picture difficult to recognize, thereby playing an enhanced anti-peep role.

[0103] Specifically, FIG. 7 illustrates that the privacy film 80 includes two privacy composite film layers 81 .

[0104] Implementation List 4

[0105] Please refer to FIG8 , which is a schematic cross-sectional view of the first display device provided in the fourth embodiment of the present application.

[0106] The display device in this embodiment includes the privacy film of any one of the above embodiments. This embodiment further describes the display device of any one of the above embodiments in detail.

[0107] In some implementations, the display panel 100 includes a display panel body 10 and a polarizer 12. The polarizer 12 is disposed between the display panel body 10 and the privacy film 80, and the polarizer 12 is disposed adjacent to both the display panel body 10 and the privacy film 80. The transmission axis of the polarizer 12 is parallel to the second direction Y.

[0108] Specifically, the display panel body 10 can be a liquid crystal display panel body, an organic light-emitting display panel body, a micro light-emitting diode display panel body, etc. The display panel body 10 emits non-linearly polarized display light, and the polarizer 12 converts the non-linearly polarized light emitted by the display panel body 10 into polarized light, and makes the polarization direction of the polarized light parallel to the second direction Y.

[0109] Specifically, the polarizer 12 is arranged adjacent to the display panel body 10 and the anti-peep film 80, that is, the display panel is different from the subsequent embodiment 5, and does not include an electrically controlled half-wave plate or a magnetically controlled optical rotator. The polarization state of the display light emitted by the display panel 100 cannot be switched. The display device 200 is an anti-peep display device, but cannot be switched between the anti-peep state and the non-anti-peep state.

[0110] Implementation List 5

[0111] Please refer to Figures 9 and 10. Figure 9 is a schematic diagram of the operation of the first display device in the anti-peeping state provided by Example 5 of the present application; Figure 10 is a schematic diagram of the operation of the first display device in the non-peeping state provided by Example 5 of the present application.

[0112] The display device in this embodiment includes the privacy film of any one of Embodiments 1 to 3. This embodiment further describes the display device of any one of Embodiments 1 to 3 in detail.

[0113] In some embodiments, a display device 200 includes a display panel 100, which includes a display panel body 10, a polarizer 12, and a polarization adjustment layer 20. The polarization adjustment layer 20 includes an electrically controlled half-wave plate or a magnetically controlled optical rotator. The polarizer 12 is disposed between the display panel body 10 and the privacy film 80; the polarization adjustment layer 20 is disposed between the polarizer 12 and the privacy film 80. The transmission axis of the polarizer 12 is parallel to the first direction X or the second direction Y.

[0114] Specifically, the polarizer 12 is disposed on the light-emitting side of the display panel body 10, the polarization adjustment layer 20 is disposed on the side of the polarizer 12 away from the display panel body 10, and the privacy film 80 is disposed on the side of the polarization adjustment layer 20 away from the display panel body 10. Specifically, the polarization adjustment layer 20 can adjust the polarization state of the display light emitted by the display panel body 10. The polarization adjustment layer 20 includes an electrically controlled half-wave plate or a magnetically controlled optical rotator.

[0115] Specifically, the transmission axis of the polarizer 12 is parallel to the first direction X. The display light entering the polarization adjustment layer 20 can adjust the polarization state of the display light after passing through the polarizer 12, so that the display device 200 has the same beneficial effects as in the first and second embodiments.

[0116] Specifically, the transmission axis of the polarizer 12 is parallel to the second direction Y. The display light entering the polarized light adjustment layer 20 can adjust the polarization state of the display light after passing through the polarizer 12, so that the display device 200 has the same beneficial effects as in the first and second embodiments.

[0117] Specifically, in this embodiment, the polarization adjustment layer 20 includes an electrically controlled half-wave plate or a magnetically controlled optical rotator, and the polarization state of the display light emitted by the display panel 100 can be switched between an anti-peeping state and a non-anti-peeping state.

[0118] In some embodiments, the electrically controlled half-wave plate includes a first substrate 21 and a second substrate 22 disposed opposite each other, a liquid crystal layer 23, and a plurality of electrodes 24. The liquid crystal layer 23 is disposed between the first substrate 21 and the second substrate 22; the plurality of electrodes 24 are disposed between the first substrate 21 and the second substrate 22, and the plurality of electrodes 24 are used to adjust the rotation state of the liquid crystal in the liquid crystal layer 23.

[0119] Specifically, the structure of the electrically controlled half-wave plate can be the same as or similar to that of a liquid crystal display panel such as a twisted nematic liquid crystal display panel (TN liquid crystal panel, full name Twisted Nematic), a vertical alignment liquid crystal display panel (VA mode, vertical alignment), etc., but does not include a color resist layer.

[0120] Specifically, the polarization adjustment layer 20 (electrically controlled half-wave plate or magnetically controlled optical rotator) can convert light with a polarization direction of the first direction X into light with a polarization direction of the second direction Y when powered on, and the polarization adjustment layer 20 does not change the polarization state of the polarized light when not powered on. Alternatively, the polarization adjustment layer 20 can convert light with a polarization direction of the first direction X into light with a polarization direction of the second direction Y when not powered on, and the polarization adjustment layer 20 does not change the polarization state of the polarized light when powered on.

[0121] In this embodiment, the polarized light adjustment layer 20 is provided, so that the display device can be switched between an anti-peeping state and a non-anti-peeping state.

[0122] It should be noted that the polarization adjustment device is an electrically controlled half-wave plate. This plate can adopt common modes such as FFS, IPS, VA, or TN (optionally without a color resist layer), or it can employ a magnetically controlled optical rotation, which functions to rotate the polarization direction of the incident light by 90°. The structure and principle of this polarization adjustment device have been widely reported and will not be described in detail here. If the light passing through the polarizer 12 is linearly polarized and parallel to the first direction X, when the polarization adjustment device is not operating, the propagation direction of the light does not change when it passes through the anti-peeping composite film layer 81, as the polarization direction is parallel to the first direction X. Therefore, the displayed image can be easily recognized from all directions, and the anti-peeping effect is lost. When the polarization adjustment device is working, if the light passing through the polarizer 12 is linearly polarized and its direction is parallel to the first direction X, the polarized light will be rotated 90°, and the polarization direction of the polarized light will be parallel to the second direction Y. When passing through the anti-peeping composite film layer 81, the displayed image in the front viewing direction will not change, but the displayed image in the side viewing direction will be inverted, translated, and distorted, making it difficult to be identified, thereby having an anti-peeping effect.

[0123] The above is a detailed introduction to an anti-peep film and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A privacy film, comprising: At least one anti-peeping composite film layer is stacked, wherein the anti-peeping composite film layer includes a first film layer and a second film layer stacked; The absolute value of the difference between the refractive index of the first film layer and the second film layer in the first direction is less than or equal to 0.1, the refractive index of the first film layer and the second film layer in the first direction are both less than the refractive index of the first film layer in the second direction, the refractive index of the first film layer and the second film layer in the first direction are both greater than the refractive index of the second film layer in the second direction, and the first direction is perpendicular to the second direction and is located on the plane where the anti-peep composite film layer is located; The first film layer and the second film layer both include a plurality of protrusions and a plurality of depressions at the contact interface, and the protrusions and depressions of the first film layer are matched and engaged with the depressions and protrusions of the second film layer respectively.

2. The privacy film according to claim 1, wherein: An absolute value of a difference between a refractive index of the first film layer in the second direction and a refractive index of the second film layer in the second direction is greater than or equal to 0.

5.

3. The privacy film according to claim 1, wherein: In a direction parallel to the plane where the anti-peep composite film layer is located, the length of the protrusions on the first film layer ranges from 100 to 300 microns, and the length of the recesses on the first film layer ranges from 100 to 300 microns.

4. The privacy film according to claim 1, wherein: In a direction perpendicular to the plane where the anti-peeping composite film layer is located, the height of the protrusions and the depth of the depressions on the first film layer range from 100 to 300 microns.

5. A display device, comprising: Display panel; an anti-peep film, arranged on the light-emitting side of the display panel, the anti-peep film comprising at least one anti-peep composite film layer stacked with the display panel in the thickness direction of the display panel, the anti-peep composite film layer comprising a first film layer and a second film layer stacked, the second film layer being located on a side of the first film layer away from the display panel; The absolute value of the difference between the refractive index of the first film layer and the second film layer in the first direction is less than or equal to 0.1, the refractive index of the first film layer and the second film layer in the first direction are both less than the refractive index of the first film layer in the second direction, the refractive index of the first film layer and the second film layer in the first direction are both greater than the refractive index of the second film layer in the second direction, and the first direction is perpendicular to the second direction and is located on the plane where the anti-peep composite film layer is located; The first film layer and the second film layer both include a plurality of protrusions and a plurality of depressions at the contact interface, and the protrusions and depressions of the first film layer are matched and engaged with the depressions and protrusions of the second film layer respectively.

6. The display device according to claim 5, wherein: The first film layer and the second film layer have the same refractive index in the first direction.

7. The display device according to claim 5, wherein: An absolute value of a difference between a refractive index of the first film layer in the second direction and a refractive index of the second film layer in the second direction is greater than or equal to 0.

5.

8. The display device according to claim 5, wherein: An absolute value of a difference between a refractive index of the first film layer in the second direction and a refractive index of the second film layer in the second direction is greater than or equal to 0.5 and less than or equal to 0.

7.

9. The display device according to claim 5, wherein: The protrusions and depressions of the first film layer are arranged in a checkerboard pattern.

10. The display device according to claim 5, wherein: The protrusions of the first film layer are arranged in an array along the third direction and the fourth direction, and the recesses of the first film layer are alternately arranged between two adjacent protrusions along the third direction and the fourth direction.

11. The display device according to claim 10, wherein: The third direction is the first direction, and the fourth direction is the second direction.

12. The display device according to claim 10, wherein: The length of the protrusion on the first film layer in the fourth direction is equal to the length of the anti-peep film in the fourth direction.

13. The display device according to claim 5, wherein: In a direction parallel to the plane where the anti-peep composite film layer is located, the length of the protrusions on the first film layer ranges from 100 to 300 microns, and the length of the recesses on the first film layer ranges from 100 to 300 microns.

14. The display device according to claim 5, wherein: In a direction perpendicular to the plane where the anti-peep composite film layer is located, the height of the protrusions and the depth of the depressions on the first film layer range from 100 to 300 microns.

15. The display device according to claim 5, wherein: The anti-peep film includes a plurality of anti-peep composite film layers, which are stacked in the thickness direction of the display panel. The second film layer of each anti-peep composite film is located on a side of the first film layer away from the display panel.

16. The display device according to claim 5, wherein: The display panel comprises: Display panel body; A polarizer is disposed between the display panel body and the privacy film, and the polarizer is disposed adjacent to the display panel body and the privacy film, and a transmission axis of the polarizer is parallel to the second direction.

17. The display device according to claim 5, wherein: The display panel comprises: Display panel body; A polarizer, disposed between the display panel body and the privacy film, wherein the transmission axis of the polarizer is parallel to the first direction or the second direction; A polarized light adjustment layer is disposed between the polarizer and the privacy film.

18. The display device according to claim 17, wherein: The polarized light adjustment layer includes an electrically controlled half-wave plate.

19. The display device according to claim 18, wherein: The electrically controlled half-wave plate comprises: a first substrate and a second substrate arranged opposite to each other, a liquid crystal layer, disposed between the first substrate and the second substrate; A plurality of electrodes are disposed between the first substrate and the second substrate, and the plurality of electrodes are used to adjust the rotation state of the liquid crystal in the liquid crystal layer.

20. The display device according to claim 17, wherein: The polarized light adjustment layer includes a magnetron rotator.

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