A display device

Abstract

The embodiment of the present application discloses a display device, including: a display panel, emitting polarized light; an anti-peep film, arranged on the light-emitting side of the display panel, the anti-peep film including at least one anti-peep composite film layer, the anti-peep composite film layer including a first film layer and a second film layer stacked, the second film layer being located on the 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 both are 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, 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; wherein 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. In the present application, a good anti-peep effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to 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 continuous popularization and application of display devices, users pay more and more attention to the protection of personal information, so the concept of anti-peeping is gradually valued by users.

[0003] However, current anti-peeping display devices have the problem of poor anti-peeping effect. Summary of the invention

[0004] The embodiments of the present application provide a display device, which can solve the problem that the current anti-peeping display device has a poor anti-peeping effect.

[0005] An embodiment of the present application provides a display device, including:

[0006] a display panel, the display panel emitting polarized light;

[0007] 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;

[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 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;

[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] Optionally, 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.

[0011] Optionally, 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.

[0012] Optionally, in some embodiments of the present application, the third direction is the first direction, and the fourth direction is the second direction.

[0013] Optionally, in some embodiments of the present application, the protrusions and depressions of the first film layer are arranged in a checkerboard pattern.

[0014] Optionally, in some embodiments of the present application, on the plane where the anti-peep composite film layer is located, the length of the protrusions on the first film layer is in the range of 100-300 microns, and the length of the recesses on the first film layer is in the range of 100-300 microns.

[0015] Optionally, 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.

[0016] Optionally, in some embodiments of the present application, the display panel includes:

[0017] Display panel body;

[0018] 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.

[0019] Optionally, in some embodiments of the present application, the display panel includes:

[0020] Display panel body;

[0021] 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;

[0022] The polarized light regulating layer comprises an electrically controlled half-wave plate or a magnetically controlled optical rotation plate, and the polarized light regulating layer is arranged between the polarizer and the anti-peep film.

[0023] Optionally, in some embodiments of the present application, the electrically controlled half-wave plate includes:

[0024] a first substrate and a second substrate arranged opposite to each other,

[0025] a liquid crystal layer, disposed between the first substrate and the second substrate;

[0026] 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.

[0027] In an embodiment of the present application, a display device is provided, comprising: a display panel, the display panel emits 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 comprises a first film layer and a second film layer stacked, the second film layer is 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, the refractive indexes 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, and the first film layer and The refractive index of 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-peep composite film layer is located; wherein the first film layer and the second film layer both include multiple protrusions and multiple 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. 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 81, thereby realizing anti-peeping display. 2) When the polarized light emitted by the display panel passes through the anti-peep composite film layer 81, when viewed in the first direction x and the second direction y, 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 first film layer B structure, and has a refractive index nxa when passing through the second film layer A structure. 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, thereby achieving wide-viewing angle display. 3) In combination with the above 1) and 2), 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 y, it is possible to switch between the anti-peeping display mode and the wide-viewing angle display mode, and the user can switch according to the practical environment or needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0029] Figure 1 A schematic diagram of the top view of the first privacy film provided in Example 1 of the present application;

[0030] Figure 2 for Figure 1 The cross-sectional structure of CC and the schematic diagram of the first light ray;

[0031] Figure 3 for Figure 1 The cross-sectional structure of DD and the schematic diagram of the second light ray;

[0032] Figure 4 for Figure 1 The cross-sectional structure of CC and the schematic diagram of the first light ray;

[0033] Figure 5 for Figure 1 The cross-sectional structure of DD and the schematic diagram of the second light ray;

[0034] Figure 6 A schematic diagram of the top view of the first privacy film provided in Example 2 of the present application;

[0035] Figure 7 A schematic diagram of an anti-peep film provided in Example 3 of the present application;

[0036] Figure 8 A schematic cross-sectional structure diagram of a first display device provided in Embodiment 4 of the present application;

[0037] Fig. 9 A schematic diagram of the working state of the first display device in the anti-peeping state provided in the fifth embodiment of the present application;

[0038] Fig.10 This is a schematic diagram of the operation of the first display device in a non-peeping state provided in Example 5 of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 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 stated, the directional words such as "upper" and "lower" used 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; while "inside" and "outside" refer to the outline of the device.

[0040] The present application provides a display device, comprising: a display panel, which emits polarized light; an anti-peep film, which is 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 comprises a stacked first film layer and a second film layer, and the second film layer is 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, the refractive indexes of the first film layer and the second film layer in the first direction are both smaller than the refractive index of the first film layer in the second direction, the refractive indexes 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, 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; wherein the first film layer and the second film layer both comprise a plurality of protrusions and a plurality of depressions at the contact interface, and the protrusions and depressions of the first film layer are respectively matched and engaged with the depressions and protrusions of the second film layer.

[0041] It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0042] Embodiment 1

[0043] See also Figures 1 to 5 , Figure 1 A schematic diagram of the top view of the first privacy film provided in Example 1 of the present application; Figure 2 for Figure 1 The cross-sectional structure of CC and the schematic diagram of the first light ray; Figure 3 for Figure 1 The cross-sectional structure of DD and the schematic diagram of the second light ray; Figure 4 for Figure 1 The cross-sectional structure of CC and the schematic diagram of the first light ray; Figure 5 for Figure 1 The cross-sectional structure of DD and the schematic diagram of the second light ray.

[0044] 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 stacked first film layer B and a second film layer A, 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 The refractive indexes of 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, and 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. The first direction X and the second direction Y are perpendicular, and both are located on the plane where the anti-peep 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.

[0045] Specifically, the anti-peep film 80 includes at least one anti-peep composite film layer 81. Figures 1 to 5 Schematically, the anti-peep film 80 includes an anti-peep composite film layer 81.

[0046] Specifically, the privacy film 80 is disposed on the light-emitting side of the display panel 100 , where 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.

[0047] Specifically, the anti-peep composite film layer 81 includes a first film layer B and a second film layer A stacked together. The second film layer A is located on a 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.

[0048] 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.

[0049] 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.

[0050] Preferably, 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.

[0051] 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.

[0052] 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.

[0053] Specifically, it is preferred that the refractive index of the first film layer B and the second film layer A in the first direction X is the same or similar, so that the anti-peeping composite film layer 81 satisfies: nyb>nxa=nxb>nya, or nyb>nxa≈nxb>nya.

[0054] 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-peep composite film layer 81 is located.

[0055] Specifically, the first film layer B and the second film layer A 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 B are matched and engaged with the depressions and protrusions of the second film layer A, respectively. Figure 1 In the cross-sectional view, the protrusions of the first film layer B and the depressions of the second film layer A are meshed, and the depressions of the first film layer B and the protrusions of the second film layer A are meshed.

[0056] Specifically, Figures 1 to 5 It is shown in the figure 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.

[0057] When the polarized light emitted by the display panel 100 passes through the anti-peep 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.

[0058] like Figure 2 As shown, 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, the 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, the total reflection and refraction occur at the side wall interface of the first protrusion B1 and the second protrusion A1 in the first direction x. Figure 2 It is shown in FIG. 8 that the wide-viewing angle light G1 is reflected or refracted, and the normal-viewing light G2 directly passes through the anti-peeping composite film layer 81 .

[0059] like Figure 3As shown, 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, 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 It is shown in FIG. 8 that the wide-viewing angle light G1 is reflected or refracted, and the normal-viewing light G2 directly passes through the anti-peeping composite film layer 81 .

[0060] It should be noted that in Figure 2 and Figure 3 In the embodiment, no matter viewed from the first direction x or the second direction y, the polarized light with the polarization direction of the second direction y is parallel to the second direction y of the second film layer A and the first film layer B, and will not change due to different viewing directions. As described above, the refractive indices of 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 reflection and refraction will occur. It has nothing to do with whether the viewing angle is in the first direction x or the second direction y, as long as it is from the second film layer B to the interface of the first film layer A, it will occur.

[0061] It should be noted that in Figure 2 and Figure 3 In the embodiment, the polarized light 101 with a large viewing angle polarized light G1 whose incident angle satisfies the critical angle of total reflection θ=arcsin(nya / nyb) will be totally reflected, 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 this part to be lost, and shifting to 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 anti-peeping.

[0062] See also Figure 4 , when the polarized light emitted by the display panel passes through the anti-peep 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 first film layer B structure, and has a refractive index nxa when passing through the second film layer A structure. 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, Figure 5 As shown, when viewed in the second direction y, light in the first direction x passes directly through the interface between the first film layer B and the second film layer A.

[0063] It should be noted that in Figure 4 and Figure 5In the figure, when the polarization direction of the polarized light 101 is parallel to the first direction X and passes through the anti-peeping composite film layer 81, since nxa=nxb or nxa≈nxb, the propagation direction of the polarized light 101 will not be disturbed, and the anti-peeping composite film layer 81 will not affect the image information from the display panel 100.

[0064] Based on the above analysis, 1) Figure 2 and Figure 3 As shown in FIG. 1 , anti-peeping display is realized. 2) As shown in FIG. Figure 4 and Figure 5 3) In combination with the above 1) and 2), when the polarization direction of the display light emitted by the display panel or the display device can be switched between the first direction x and the second direction y, the switch between the anti-peeping display mode and the wide-viewing angle display mode can be realized, and the user can switch according to the practical environment or needs.

[0065] 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.

[0066] Specifically, the absolute value of the difference between nyb and nya is greater than or equal to 0.5.

[0067] Specifically, the absolute value of the difference between nyb and nya is less than or equal to 0.7.

[0068] Specifically, when the polarization direction of the polarized light 101 is parallel to the second direction Y, such as Figure 2 and Figure 3 As shown, when passing through the anti-peeping composite film layer 81, due to nya<nyb, when the polarized light 101 enters the second film layer A from the first film layer B, the polarized light 101 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, and a good anti-peeping viewing angle can be obtained.

[0069] In some embodiments, Figures 1 to 5 As shown, 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.

[0070] 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.

[0071] In some embodiments, Figures 1 to 5 As shown, the third direction U is the first direction X, and the fourth direction V is the second direction Y.

[0072] Specifically, when the polarization direction of the polarized light 101 is the second direction Y, the total reflection that has an anti-peeping effect mainly occurs on the side walls of the protrusions of the first film layer B. The protrusions of the first film layer B are 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 walls of the protrusions of the first film layer B extend along the first direction and / or the second direction Y, which can increase the area of ​​total reflection and / or refraction, thereby better playing an anti-peeping role.

[0073] In some embodiments, Figure 2 As shown, the protrusions and depressions of the first film layer B are arranged in a checkerboard pattern.

[0074] 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, so that the protrusions with anti-peeping function on the first film layer B 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.

[0075] In some embodiments, on the plane where the anti-peep composite film layer 81 is located, the length of the protrusion on the first film layer B ( Figure 1 The first length d1) is in the range of 100-300 μm, and the length of the depression on the first film layer B ( Figure 1 The second length d2) is in the range of 100-300 microns. This setting can prevent people from recognizing the protrusions or depressions. The first length d1 is the maximum length of the protrusions on the first film layer B on the plane where the anti-peep composite film layer 81 is located, and the second length d2 is the maximum length of the depressions on the first film layer B on the plane where the anti-peep composite film layer 81 is located.

[0076] Furthermore, in a direction perpendicular to the plane where the anti-peep composite film layer 81 is located, the height of the protrusion on the first film layer B ( Figure 1 The first height h1) and the depth of the depression ( Figure 1 The second height h2) is also set to the range of 100-300 microns, which can prevent the user from recognizing the protrusions or depressions when looking sideways.

[0077] Embodiment 2

[0078] See also Figure 6 , Figure 6 This is a schematic diagram of the top view structure of the first anti-peep film provided in Example 2 of the present application.

[0079] The anti-peep composite film layer 81 in this embodiment is the same or similar to the anti-peep composite film layer 81 in any one of the first embodiments, except that 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. The similarities are not repeated here, and only the differences are described here.

[0080] 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.

[0081] Specifically, compared with the anti-peep composite film layer 81 of any one of the embodiments, the Figure 3 The interface between the first film layer B and the second film layer A undergoes total reflection and refraction when viewed in the second direction y, 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.

[0082] 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 anti-peep film 80 in the fourth direction v.

[0083] Specifically, compared with the anti-peep composite film layer 81 of any one of the embodiments, there is no Figure 3 The interface between the first film layer B and the second film layer A undergoes total reflection and refraction, so that when viewed in the second direction y, the wide viewing angle light G1 is directly transmitted 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.

[0084] In this embodiment, the second direction y can be the up and down direction. When the user views it, the second direction y (for example, the up and down direction) has a good wide viewing angle, while the first direction x is smaller than that in the first embodiment, which can further provide different practical requirements for the anti-peep composite film layer 81.

[0085] Embodiment 3

[0086] 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 of any one of the first embodiment and the second embodiment.

[0087] See also Figure 7 , Figure 7 This is a schematic diagram of an anti-peep film provided in Example 3 of the present application.

[0088] In some embodiments, Figure 7As shown, 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.

[0089] Specifically, the anti-peep film 80 includes a plurality of anti-peep composite film layers 81 , each of which can be independent of each other, and each of which plays an anti-peep composite film layer 81 , thereby further improving the anti-peep effect.

[0090] 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 make the image information undergo a mirror flip and change the propagation direction of light at the same time, so that the image information of this part is lost, and the image information of this part is shifted to overlap 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.

[0091] Specifically, Figure 7 It is shown that the anti-peep film 80 includes two anti-peep composite film layers 81 .

[0092] Implementation List 4

[0093] See also Figure 8 , Figure 8 This is a schematic diagram of the cross-sectional structure of the first display device provided in Example 4 of the present application.

[0094] The display device in this embodiment includes the anti-peep film of any one of the above embodiments. This embodiment further describes the display device of any one of the above embodiments in detail.

[0095] 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 100 body and the privacy film 80, and the polarizer 12 is disposed adjacent to both the display panel 100 body and the privacy film 80, and the transmission axis of the polarizer 12 is parallel to the second direction Y.

[0096] 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.

[0097] Specifically, the polarizer 12 is arranged adjacent to the display panel 100 body 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 polarizer. The polarization state of the display light emitted by the display panel 100 cannot be switched, and 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.

[0098] Implementation column five

[0099] See also Fig. 9 and Fig.10 , Fig. 9 A schematic diagram of the working state of the first display device in the anti-peeping state provided in the fifth embodiment of the present application; Fig.10 This is a schematic diagram of the operation of the first display device in a non-peeping state provided in Example 5 of the present application.

[0100] The display device in this embodiment includes the anti-peep 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.

[0101] In some embodiments, the display device 200 includes a display panel 100, the display panel 100 includes a display panel body 10, a polarizer 12, and a polarized light adjustment layer 20, and the polarized light adjustment layer 20 includes an electrically controlled half-wave plate or a magnetically controlled optical rotation plate. The polarizer 12 is disposed between the display panel body 10 and the privacy film 80; the polarized light adjustment layer 20 is disposed between the polarizer 12 and the privacy film 80, and the transmission axis of the polarizer 12 is parallel to the first direction X or the second direction Y.

[0102] Specifically, the polarizer 12 is disposed on the light-emitting side of the display panel body 10, the polarized light 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 polarized light adjustment layer 20 away from the display panel body 10. Specifically, the polarized light adjustment layer 20 can adjust the polarization state of the display light emitted by the display panel body 10, and the polarized light adjustment layer 20 includes an electrically controlled half-wave plate or a magnetically controlled optical rotator.

[0103] Specifically, the transmission axis of the polarizer 12 is parallel to the first direction X, and 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.

[0104] Specifically, the transmission axis of the polarizer 12 is parallel to the second direction Y, and 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.

[0105] Specifically, in this embodiment, the polarized light adjustment layer 20 includes an electrically controlled half-wave plate or a magnetically controlled polarizer, 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.

[0106] In some embodiments, the electrically controlled half-wave plate includes a first substrate 21 and a second substrate 22 disposed opposite to 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.

[0107] Specifically, the structure of the electrically controlled half-wave plate can be the same as or similar to that of 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.

[0108] Specifically, the polarization light adjustment layer 20 (electrically controlled half-wave plate or magneto-controlled optical rotator) can convert light with a polarization direction of a first direction X into light with a polarization direction of a second direction Y when powered on, and the polarization light adjustment layer 20 does not change the polarization state of the polarized light when not powered on; alternatively, the polarization light adjustment layer 20 can convert light with a polarization direction of a first direction X into light with a polarization direction of a second direction Y when not powered on, and the polarization light adjustment layer 20 does not change the polarization state of the polarized light when powered on.

[0109] In this embodiment, since the polarized light adjustment layer 20 is provided, the display device can be switched between an anti-peeping state and a non-anti-peeping state.

[0110] It should be noted that the polarization light adjustment device is an electrically controlled half-wave plate, which can adopt common modes such as FFS, IPS, VA or TN (preferably without a color resistance layer), or can adopt magnetic rotation, which is used to rotate the polarization direction of the incident light by 90°. The structure and principle of the polarization light adjustment device have been reported in many reports and will not be introduced in detail here. If the light passing through the polarizer 12 is linearly polarized and its direction is parallel to the first direction X, when the polarization light adjustment device is not working, since the polarization direction of the polarized light is parallel to the first direction X, when passing through the anti-peep composite film layer 81, the propagation direction does not change, and the displayed image can be easily recognized in all directions, and there is no anti-peep effect. When the polarized light 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.

[0111] The above is a detailed introduction to a display device 200 provided in an embodiment 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 of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A display device, characterized in that: include: 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.

2. The display device 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 display device according to claim 2, wherein: The protrusions and depressions of the first film layer are arranged in a checkerboard pattern.

4. The display device according to claim 1, 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.

5. The display device according to claim 4, characterized in that The third direction is the first direction, and the fourth direction is the second direction.

6. The display device according to claim 1, wherein: The protrusions of the first film layer are arranged along the third direction, and the length of the protrusions on the first film layer in the fourth direction is equal to the length of the anti-peep film in the fourth direction.

7. The display device according to claim 1, wherein: On the plane where the anti-peep composite film layer is located, the length of the protrusions on the first film layer is in the range of 100-300 microns, and the length of the recesses on the first film layer is in the range of 100-300 microns.

8. The display device according to claim 1, 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.

9. The display device according to claim 1, 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; The polarized light regulating layer comprises an electrically controlled half-wave plate or a magnetically controlled optical rotation plate, and the polarized light regulating layer is arranged between the polarizer and the anti-peep film.

10. The display device according to claim 9, characterized in that 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.

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