Peep-proof film and peep-proof display device

Abstract

The invention discloses a peep-proof film and a peep-proof display device. The peep-proof film comprises a bottom light-transmitting film layer, a top light-transmitting film layer and a middle layer, the middle layer is located between the bottom light-transmitting film layer and the top light-transmitting film layer, and the middle layer comprises a plurality of light absorption structures which are arranged at intervals; the peep-proof film further comprises a light-transmitting area, a peep-proof area and a transition area, and the transition area is located between the light-transmitting area and the peep-proof area. The light absorption structure located in the light transmitting area is a first light absorption structure, the light absorption structure located in the peep-proof area is a second light absorption structure, and the light absorption structure located in the transition area is a third light absorption structure. In the thickness direction of the peep-proof film, the height of the first light absorption structure is a first height h1, the height of the second light absorption structure is a second height h2, and the height of the third light absorption structure is a third height h3; wherein h1 < h3 < h2, or h1 = h3 < h2, or h1 < h3 = h2. According to the technical scheme, partitioned peep prevention can be achieved, meanwhile, visual impact can be buffered, and the visual experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-peeping, and particularly relates to an anti-peeping film and an anti-peeping display device. Background Art

[0002] In recent years, people have paid more and more attention to the protection of privacy and information security.

[0003] When consumers use display devices such as mobile phones and computers, there may be a risk of privacy leakage on the screen. Although there are already anti-peeping products on the market, most of the anti-peeping films have anti-peeping effects, but they cannot achieve zoned anti-peeping. Summary of the Invention

[0004] The present invention provides an anti-peeping film and an anti-peeping display device, which can achieve zoned anti-peeping, and at the same time can buffer visual impact and improve the user's visual experience.

[0005] In a first aspect, the present invention provides an anti-peeping film, including: a bottom light-transmitting film layer, a top light-transmitting film layer, and an intermediate layer;

[0006] The intermediate layer is located between the bottom light-transmitting film layer and the top light-transmitting film layer, and the intermediate layer includes a plurality of light-absorbing structures arranged at intervals;

[0007] The anti-peeping film further includes a light-transmitting area, an anti-peeping area, and a transition area, and the transition area is located between the light-transmitting area and the anti-peeping area;

[0008] The light-absorbing structure located in the light-transmitting area is a first light-absorbing structure, the light-absorbing structure located in the anti-peeping area is a second light-absorbing structure, and the light-absorbing structure located in the transition area is a third light-absorbing structure;

[0009] In the thickness direction of the anti-peeping film, the height of the first light-absorbing structure is a first height h1, the height of the second light-absorbing structure is a second height h2, and the height of the third light-absorbing structure is a third height h3;

[0010] Wherein, h1 < h3 < h2, or, h1 = h3 < h2, or, h1 < h3 = h2.

[0011] Optionally, the light-absorbing structure includes a first side length close to the bottom light-transmitting film layer, a second side length close to the top light-transmitting film layer, and a third side length and a fourth side length connecting the first side length and the second side length;

[0012] The third side length and the fourth side length are centrosymmetric about the center of the first side length or the second side length; the included angle between the third side length and the first side length is θ, and 70° ≤ θ ≤ 90°.

[0013] Optionally, the included angle between the third side length and the first side length in the first light-absorbing structure is θ1, the included angle between the third side length and the first side length in the second light-absorbing structure is θ2, and the included angle between the third side length and the first side length in the third light-absorbing structure is θ3;

[0014] θ1 ≤ θ2 ≤ θ3.

[0015] Optionally, along the direction from the light-transmitting area to the anti-peeping area, the width of the transition area is W0;

[0016] wherein, 0 mm ≤ W0 ≤ 200 mm.

[0017] Optionally, the thickness of the bottom light-transmitting film layer is d1, and the thickness of the top light-transmitting film layer is d2;

[0018] wherein, 0 μm < d1 ≤ 250 μm, 0 μm < d2 ≤ 250 μm.

[0019] Optionally, the light-absorbing structure includes a first side length close to the bottom light-transmitting film layer;

[0020] The width of the first side length of the first light-absorbing structure is w1, the width of the first side length of the second light-absorbing structure is w2, and the width of the first side length of the third light-absorbing structure is w3;

[0021] wherein, w1 ≤ w3 ≤ w2.

[0022] Optionally, the thickness of the intermediate layer is H;

[0023] wherein, 0 μm < H ≤ 200 μm, 0 μm ≤ h1 ≤ h2 ≤ 200 μm.

[0024] Optionally, along the direction from the light-transmitting area to the anti-peeping area, the height of the third light-absorbing structure gradually increases.

[0025] In a second aspect, the present invention further provides an anti-peeping display device, including: a display panel, a first backlight module, and the anti-peeping film according to the first aspect;

[0026] The anti-peeping film is located between the display panel and the first backlight module.

[0027] Optionally, the anti-peeping display device further includes: a transparent backlight module;

[0028] The transparent backlight module is located between the anti-peeping film and the display panel.

[0029] The technical solution provided by the present invention is to set a light-absorbing structure in the privacy screen film. The light-absorbing structure in the light-transmitting area is the first light-absorbing structure, the light-absorbing structure in the privacy area is the second light-absorbing structure, and the light-absorbing structure in the transition area is the third light-absorbing structure. In the thickness direction of the privacy screen film, the height of the first light-absorbing structure is the first height h1, the height of the second light-absorbing structure is the second height h2, and the height of the third light-absorbing structure is the third height h3. When h1 < h2, the absorption and cut-off effect of the second light-absorbing structure on large-angle light beams is greater than that of the first light-absorbing structure on large-angle light beams. Therefore, when the light beam exits from the bottom light-transmitting film layer side through the privacy screen film to the top light-transmitting film layer, the viewing angle of the light beam exiting through the privacy area is smaller, having a privacy protection effect; the viewing angle of the light beam exiting through the light-transmitting area is larger, having a large viewing angle sharing effect. On this basis, when h1 = h3 < h2, the absorption and cut-off effect of the third light-absorbing structure on large-angle light beams is equal to that of the first light-absorbing structure, so as to increase the light-transmitting area of the privacy screen film; when h1 < h3 = h2, the absorption and cut-off effect of the third light-absorbing structure on large-angle light beams is equal to that of the second light-absorbing structure, so as to increase the privacy area of the privacy screen film; when h1 < h3 < h2, the absorption and cut-off effect of the third light-absorbing structure on large-angle light beams is between the first light-absorbing structure and the second light-absorbing structure, and the viewing angle of the light beam exiting through the transition area is between the viewing angles of the privacy area and the light-transmitting area, so as to buffer the visual impact and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. is a schematic structural diagram of a privacy screen film provided by an embodiment of the present invention;

[0031] Figure 2 FIG. is a schematic structural diagram of another privacy screen film provided by an embodiment of the present invention;

[0032] Figure 3 FIG. is a schematic structural diagram of a light-absorbing structure provided by an embodiment of the present invention;

[0033] Figure 4 FIG. is a schematic structural diagram of yet another privacy screen film provided by an embodiment of the present invention;

[0034] Figure 5 FIG. is a schematic structural diagram of a privacy display device provided by an embodiment of the present invention;

[0035] Figure 6 FIG. is a schematic structural diagram of a first backlight module provided by an embodiment of the present invention;

[0036] Figure 7 FIG. is a schematic diagram of the viewing angle of a privacy display device provided by an embodiment of the present invention;

[0037] Figure 8 FIG. is a schematic structural diagram of another privacy display device provided by an embodiment of the present invention;

[0038] Figure 9 It is a schematic structural diagram of another anti-peeping display device provided by an embodiment of the present invention. Specific embodiments

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0040] Figure 1 It is a schematic structural diagram of an anti-peeping film provided by an embodiment of the present invention. As Figure 1 shown, the anti-peeping film 10 includes: a bottom light-transmitting film layer 11, a top light-transmitting film layer 12, and an intermediate layer 13. The intermediate layer 13 is located between the bottom light-transmitting film layer 11 and the top light-transmitting film layer 12. The intermediate layer 13 includes a plurality of light-absorbing structures 14 arranged at intervals; the anti-peeping film 10 further includes a light-transmitting area 01, an anti-peeping area 02, and a transition area 03. The transition area 03 is located between the light-transmitting area 01 and the anti-peeping area 02. The light-absorbing structure 14 located in the light-transmitting area 01 is the first light-absorbing structure 141, the light-absorbing structure 14 located in the anti-peeping area 02 is the second light-absorbing structure 142, and the light-absorbing structure 14 located in the transition area 03 is the third light-absorbing structure 143. In the thickness direction Z of the anti-peeping film 10, the height of the first light-absorbing structure 141 is the first height h1, the height of the second light-absorbing structure 142 is the second height h2, and the height of the third light-absorbing structure 143 is the third height h3; the thickness of the intermediate layer 13 is H; wherein, h1 < h3 < h2, or, h1 = h3 < h2, or, h1 < h3 = h2, h2 ≤ H.

[0041] Among them, the bottom light-transmitting film layer 11 and the top light-transmitting film layer 12 can be made of materials such as PC, PET, or SRF. Preferably, the bottom light-transmitting film layer 11 and the top light-transmitting film layer 12 are PC. The material of the light-absorbing structure 14 can be carbon black-doped UV glue. The intermediate material between the light-absorbing structures 14 in the intermediate layer 13 can include materials with a relatively high light transmittance. The refractive index of light of the intermediate material between the light-absorbing structures 14 in the intermediate layer 13 can be the same as or different from the refractive index of light of the light-absorbing structure 14. In an optional embodiment, the refractive index of light of the light-absorbing structure 14 is n1, 1.5 ≤ n1 ≤ 1.7, and the refractive index of light of the intermediate material is n2, 1.5 ≤ n2 ≤ 1.7. Exemplarily, the refractive index of light n1 of the light-absorbing structure 14 is 1.575, and the refractive index of light n2 of the intermediate material is 1.585. It can be set according to actual needs and is not specifically limited here.

[0042] Specifically, when the light beam passes through the bottom light-transmitting film layer 11 and enters the intermediate layer 13, the light beam not blocked by the light-absorbing structure 14 can continue to exit through the top light-transmitting film layer 12; the light beam incident on the light-absorbing structure 14 is absorbed by the light-absorbing structure 14 and will not continue to exit through the top light-transmitting film layer 13. By arranging the light-absorbing structure 14 in the intermediate layer 13, and making the second height h2 of the second light-absorbing structure 142 located in the anti-peeping area 02 greater than the third height h3 of the third light-absorbing structure 143 located in the transition area 03, and the third height h3 of the third light-absorbing structure 143 located in the transition area 03 greater than the first height h1 of the first light-absorbing structure 141 located in the light-transmitting area 01, so that the absorption and cut-off effect of the second light-absorbing structure 142 on the large-angle light beam is greater than that of the third light-absorbing structure 143 on the large-angle light beam; the absorption and cut-off effect of the third light-absorbing structure 143 on the large-angle light beam is greater than that of the first light-absorbing structure 141 on the large-angle light beam. Furthermore, after the light beam passes through the light-transmitting area 01, it still has a relatively large viewing angle. After the light beam passes through the transition area 03, the viewing angle is smaller. After the light beam passes through the anti-peeping area 02, the viewing angle is even smaller. Therefore, the anti-peeping area 02 can achieve the anti-peeping effect, the light-transmitting area 01 can normally emit large-angle light beams, and the transition area 03 can buffer the boundary between the light-transmitting area 01 and the anti-peeping area 02 to buffer the visual impact. In this way, the anti-peeping film provided by the present invention can achieve zoned anti-peeping, has a simple structure, and a buffer area is provided between the light-transmitting area and the anti-peeping area to buffer the visual impact. In addition, on the basis of h2>h1, h3 can be equal to h1. By setting the third height h3 of the third light-absorbing structure 143 located in the transition area 03 to be equal to the first height h1 of the first light-absorbing structure 141 located in the light-transmitting area 01, and both h1 and h3 are less than h2, the light-transmitting area 01 and the transition area 03 can both emit large-angle light beams, and the anti-peeping area 02 can achieve the anti-peeping effect, improving the large-angle light-transmitting area of the anti-peeping film. In addition, on the basis of h2>h1, h3 can also be equal to h2. By setting the third height h3 of the third light-absorbing structure 143 located in the transition area 03 to be equal to the second height h2 of the second light-absorbing structure 142 located in the anti-peeping area 02, and both h1 and h3 are less than h2, the light-transmitting area 01 can emit large-angle light beams, and the anti-peeping area 02 and the transition area 03 can both achieve the anti-peeping effect, improving the anti-peeping area of the anti-peeping film.

[0043] In the technical solution of the embodiment of the present invention, by providing a light-absorbing structure in the privacy film, the light-absorbing structure located in the light-transmitting area is the first light-absorbing structure, the light-absorbing structure located in the privacy area is the second light-absorbing structure, and the light-absorbing structure located in the transition area is the third light-absorbing structure; in the thickness direction of the privacy film, the height of the first light-absorbing structure is the first height h1, the height of the second light-absorbing structure is the second height h2, and the height of the third light-absorbing structure is the third height h3. When h1 < h2, the absorption cut-off effect of the second light-absorbing structure on large-angle light beams is greater than that of the first light-absorbing structure on large-angle light beams. Furthermore, when the light beam exits from the bottom light-transmitting film layer side through the privacy film to the top light-transmitting film layer, the viewing angle of the light beam exiting through the privacy area is smaller, having a privacy effect; the viewing angle of the light beam exiting through the light-transmitting area is larger, having a large viewing angle sharing effect; on this basis, when h1 = h3 < h2, the absorption cut-off effect of the third light-absorbing structure on large-angle light beams is equal to that of the first light-absorbing structure, so as to increase the light-transmitting area of the privacy film; when h1 < h3 = h2, the absorption cut-off effect of the third light-absorbing structure on large-angle light beams is equal to that of the second light-absorbing structure, so as to increase the privacy area of the privacy film; when h1 < h3 < h2, the absorption cut-off effect of the third light-absorbing structure on large-angle light beams is between that of the first light-absorbing structure and the second light-absorbing structure, and the viewing angle of the light beam exiting through the transition area is between the viewing angles of the privacy area and the light-transmitting area, so as to buffer the visual impact and improve the user experience.

[0044] Optionally, continue to refer to Figure 1 , the thickness of the intermediate layer 13 is H.

[0045] Wherein, 0μm < H ≤ 200μm, 0μm < h1 ≤ h2 ≤ 200μm.

[0046] Specifically, the height of the light-absorbing structure 14 is less than the thickness H of the intermediate layer 13. The heights of the first light-absorbing structure 141 and the second light-absorbing structure 142 are related to the thickness of the intermediate layer 13. The greater the thickness of the intermediate layer 13, the greater the heights of the first light-absorbing structure 141 and the second light-absorbing structure 142, so as to achieve a better light-absorbing effect or brightness adjustment. If the thickness H of the intermediate layer 13 is greater than 200μm, it will cause the overall thickness of the privacy film 10 to be too large, which is not conducive to thinning. Therefore, the thickness H of the intermediate layer 13 is set between 0μm and 200μm, and at the same time, the first height h1 of the first light-absorbing structure 141 and the second height h2 of the second light-absorbing structure 142 are set below 200μm, so that the first light-absorbing structure 141 can absorb part of the light beams in the light-transmitting area 01, ensuring the light-emitting brightness and large viewing angle of the light-transmitting area 01, and the second light-absorbing structure 142 can absorb the large-angle light beams in the privacy area 02, preventing the light beams in the privacy area 02 from exiting to the light-transmitting area 02, reducing the viewing angle of the privacy area 02, and improving the privacy performance of the privacy area 02.

[0047] Exemplarily, the thickness H of the intermediate layer 13 is 188 μm, the first height h1 of the first light-absorbing structure 141 is 60 μm, the second height h2 of the second light-absorbing structure 142 is 120 μm or 150 μm, the third height h3 of the third light-absorbing structure 143 is 90 μm or 100 μm, and it can also be other values, which are not specifically limited here.

[0048] It can be understood that the transition region 03 includes a plurality of third light-absorbing structures 143. Figure 1 Only the same third height of each third light-absorbing structure 143 is shown. In other alternative embodiments, the third heights of the third light-absorbing structures 143 can also be different. Figure 2 This is a schematic structural diagram of another anti-peeping film provided by an embodiment of the present invention. As Figure 2 shown, along the direction from the light-transmitting region 01 to the anti-peeping region 02, the height of the third light-absorbing structure 143 gradually increases. In this way, the viewing angle of the transition region 03 can be gradually reduced, playing a role of visual buffering.

[0049] Optionally, Figure 3 This is a schematic structural diagram of a light-absorbing structure provided by an embodiment of the present invention. Referring to Figure 1 and Figure 3 , the light-absorbing structure 14 includes a first side length a1 close to the bottom light-transmitting film layer 11, a second side length a2 close to the top light-transmitting film layer 12, and a third side length a3 and a fourth side length a4 connecting the first side length a1 and the second side length a2; the third side length a3 and the fourth side length a4 are centrosymmetric about the center of the first side length a1 or the second side length a2; the included angle between the third side length a3 and the first side length a1 is θ, and 70° ≤ θ ≤ 90°.

[0050] Specifically, the included angle θ between the third side length a3 and the first side length a1 determines the cross-sectional shape of the light-absorbing structure 14. The larger the included angle θ, the closer the second side length a2 is to the first side length a1, the larger the volume of the light-absorbing structure 14, and the better the absorption effect on the light beam. On the premise that the length of the first side length a1 is fixed, if the included angle θ between the third side length a3 and the first side length a1 is less than 70°, the second side length a2 is much smaller than the first side length a1, resulting in a smaller volume of the light-absorbing structure 14, and thus a poorer absorption effect on the light beam, leading to a stronger brightness of the emitted light beam, which may cause problems such as glare and affect the user experience. If the included angle θ between the third side length a3 and the first side length a1 is greater than 90°, the second side length a2 is greater than the first side length a1, such that the size of the light-absorbing structure 14 near the top light-transmitting film layer 12 is larger than the size near the bottom light-transmitting film layer 11. The light-absorbing structure 14 near the top light-transmitting film layer 12 will absorb more light beams, resulting in a smaller field of view angle or light-emitting brightness of the emitted light beam, leading to a poor user viewing experience. Therefore, by setting the included angle θ between the third side length a3 and the first side length a1 at 70° to 90°, the light-absorbing structure has a suitable light-absorbing volume, and then the brightness of the emitted light beam is adjusted to enable the anti-peeping film 10 to have a better light-emitting brightness and improve the user viewing experience.

[0051] Optionally, continue to refer to Figure 1 and Figure 3 , the included angle between the third side length and the first side length in the first light-absorbing structure 141 is θ1, the included angle between the third side length and the first side length in the second light-absorbing structure 142 is θ2, and the included angle between the third side length and the first side length in the third light-absorbing structure 143 is θ3; θ1 ≤ θ2 ≤ θ3.

[0052] Specifically, by setting θ1 ≤ θ2 ≤ θ3, the first light-absorbing structure 141 in the light-transmitting area 01 has a smaller light-absorbing volume, the second light-absorbing structure 142 in the anti-peeping area 02 has a larger light-absorbing volume, and the light-absorbing volume of the third light-absorbing structure 143 in the transition area 03 is larger than the light-absorbing volume of the first light-absorbing structure 141 and smaller than the light-absorbing volume of the second light-absorbing structure 142. Therefore, the light-absorbing effect of the first light-absorbing structure 141 is less than the light-absorbing effect of the third light-absorbing structure 143, and the light-absorbing effect of the third light-absorbing structure 143 is less than the light-absorbing effect of the second light-absorbing structure 142, such that the brightness and field of view angle of the light beam emitted through the light-transmitting area 01 are greater than those of the light beam emitted through the transition area 03, and the brightness and field of view angle of the light beam emitted through the transition area 03 are greater than those of the light beam emitted through the anti-peeping area 02, thereby enabling the light-transmitting area 01 to have a better light-emitting brightness and a larger field of view angle and ensuring the light beam emission effect of the light-transmitting area 01.

[0053] Exemplarily, the included angle θ1 between the third side length and the first side length in the first light-absorbing structure 141 is 84°, the included angle θ2 between the third side length and the first side length in the second light-absorbing structure 142 is 86°, and the included angle θ3 between the third side length and the first side length in the third light-absorbing structure 143 is 88°. It can also be other values, and specific limitations are not made here.

[0054] Optionally, referring to Figure 1 , in the direction from the light-transmitting area 01 to the anti-peeping area 02, the width of the transition area 03 is W0; where 0 mm ≤ W0 ≤ 200 mm.

[0055] Specifically, if the width W0 of the transition area 03 is greater than 200 mm, the sizes of the light-transmitting area 01 and the anti-peeping area 02 will be reduced, resulting in a reduction in the visible area of the light-transmitting area 01 and the anti-peeping area 02, which affects the user experience. Therefore, by setting the width W0 of the transition area 03 between 0 mm and 200 mm, while the transition area 03 buffers the visual impact, it reduces the occupied size of the transition area 03 on the anti-peeping film 10, ensures the light-emitting sizes of the light-transmitting area 01 and the anti-peeping area 02, and improves the user experience. Exemplarily, the width W0 of the transition area 03 is 50 mm. It can also be other values, and specific limitations are not made here.

[0056] Optionally, continuing to refer to Figure 1 , the thickness of the bottom light-transmitting film layer 11 is d1, and the thickness of the top light-transmitting film layer 12 is d2; where 0 μm < d1 ≤ 250 μm, 0 μm < d2 ≤ 250 μm.

[0057] Specifically, if the thicknesses d1 of the bottom light-transmitting film layer 11 and d2 of the top light-transmitting film layer 12 are both greater than 250 μm, then both the bottom light-transmitting film layer 11 and the top light-transmitting film layer 12 are relatively thick, resulting in a decrease in the light transmittance of the bottom light-transmitting film layer 11 and the top light-transmitting film layer 12, and the anti-peeping film 10 has a low light-emitting efficiency, which affects the viewing experience. Therefore, by setting the thicknesses d1 of the bottom light-transmitting film layer 11 and d2 of the top light-transmitting film layer 12 both between 0 μm and 250 μm, the bottom light-transmitting film layer 11 and the top light-transmitting film layer 12 can reliably protect the intermediate layer 13, and at the same time have a high light beam transmittance, thereby improving the light-emitting efficiency of the anti-peeping film 10.

[0058] Optionally, Figure 4 is a schematic structural diagram of another anti-peeping film provided by an embodiment of the present invention. Referring to Figure 3 and Figure 4 , the light-absorbing structure 14 includes a first side length a1 close to the bottom light-transmitting film layer 11; the width of the first side length a1 of the first light-absorbing structure 141 is w1, the width of the first side length a1 of the second light-absorbing structure 142 is w2, and the width of the first side length a1 of the third light-absorbing structure 143 is w3; where w1 ≤ w3 ≤ w2.

[0059] Specifically, on the basis of h1<h3<h2, by setting the width w1 of the first side length a1 in the first light absorption structure 141 to be smaller than the width w3 of the third light absorption structure 143, and the width w3 of the third light absorption structure 143 to be smaller than the width w2 of the second light absorption structure 142, the light absorption volume of the first light absorption structure 141 can be further reduced, the light absorption volume of the second light absorption structure 142 can be increased, the absorption degree of the second light absorption structure 142 to the wide viewing angle light beam can be enhanced, and the anti-peeping performance of the anti-peeping area 02 can be improved. Exemplarily, the width w1 of the first side length a1 of the first light absorption structure 141 is 17μm, the width w2 of the first side length a1 of the second light absorption structure 142 is 19μm, and the width w3 of the first side length a1 of the third light absorption structure 143 is 18μm. The spacing between two adjacent first light absorption structures 141 is 18 μm, the spacing between two adjacent second light absorption structures 142 is 20 μm, and the spacing between two adjacent third light absorption structures 143 is 19 μm. Other spacings are also possible and are not specifically limited here.

[0060] Based on the same inventive concept, an embodiment of the present invention further provides an anti-peeping display device, Figure 5 A schematic diagram of the structure of an anti-peeping display device provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the anti-peeping display device 200 includes a display panel 20 , a first backlight module 31 , and an anti-peeping film 10 provided by any embodiment of the present invention; the anti-peeping film 10 is located between the display panel 20 and the first backlight module 31 .

[0061] The first backlight module 31 includes a backlight source, a uniform light film, a brightness enhancement film, etc. Optionally, Figure 6 A schematic diagram of the structure of a first backlight module provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the first backlight module 31 includes a light reflecting film 311, a light source board 312, a diffusion film 313, a prism film 314 and a brightness enhancement film 315. The light source board 312 includes a direct backlight light source or an edge-entry backlight light source. When the light source board 312 provides a light beam to the display panel 20 side, part of the light beam leaks to the side of the light source board 312 away from the display panel 20. At this time, the light reflecting film 311 can reflect the light beam to the display panel 20 side to increase the backlight brightness and reduce light loss. The diffusion film 313 is used to uniform the light beam, and the prism film 314 and the brightness enhancement film 315 are used to enhance the brightness of the light beam and improve the overall light output effect of the first backlight module 31. In other optional embodiments, the first backlight module 31 can also only include the light reflecting film 311, the light source board 312 and the prism film 314. Alternatively, the first backlight module 31 may only include the light reflection film 311 , the light source plate 312 , the diffusion film 313 , etc., which may be configured according to actual needs and are not specifically limited here.

[0062] Specifically, Figure 7 is a schematic diagram of the viewing angle of an anti-peeping display device provided by an embodiment of the present invention. Refer to Figure 5 and Figure 7 . The first backlight module 31 is used to provide a backlight beam. After the backlight beam passes through the anti-peeping film 10, the beam emitted through the light-transmitting area 01 has a larger viewing angle A, the beam emitted through the anti-peeping area 02 has a smaller viewing angle C, and the viewing angle B of the beam emitted through the transition area 03 is between the viewing angle A and the viewing angle C, so that the anti-peeping display device 200 can achieve zoned anti-peeping, and at the same time can buffer the visual impact between the light-transmitting area 01 and the anti-peeping area 02, improving the user's visual experience.

[0063] It can be understood that the anti-peeping display device 200 can be applied to an in-vehicle display. The light-transmitting area 01 corresponds to the driver's seat, and the anti-peeping area 03 corresponds to the passenger seat. When the anti-peeping display device 200 is in the zoned anti-peeping state, the picture displayed in the anti-peeping area 03 will not interfere with the driver, improving the driving safety of the driver.

[0064] Figure 8 is a schematic structural diagram of another anti-peeping display device provided by an embodiment of the present invention. Figure 9 is a schematic structural diagram of yet another anti-peeping display device provided by an embodiment of the present invention. Refer to Figure 8 and Figure 9 . The anti-peeping display device 200 further includes: a transparent backlight module 32; the transparent backlight module 32 is located between the anti-peeping film 10 and the display panel 20.

[0065] Among them, the transparent backlight module 32 may include a light source board and a diffusion film, etc., and can be set according to actual needs. In an exemplary embodiment, the transparent backlight module 32 includes a light source board, and the light source board can be a direct-lit backlight source or a side-lit backlight source. In another exemplary embodiment, the transparent backlight module 32 includes a light source board and a diffusion film, and can also be others, which are not specifically limited here.

[0066] Specifically, as Figure 8 shows, the transparent backlight module 32 is in the off state. At this time, after the beam emitted by the first backlight module 31 passes through the anti-peeping film 10, the transparent backlight module 32 and the display panel 20, the emitted beam is Figure 5 the same. At this time, the anti-peeping display device 200 has a zoned anti-peeping effect. As Figure 9As shown, the transparent backlight module 32 is in the on state. At this time, regardless of whether the first backlight module 31 provides light, the light beam emitted by the anti-peeking display device 200 is the light beam provided by the transparent backlight module 32, so that the light beam emitted by the anti-peeking display device 200 has a large viewing angle. At this time, the anti-peeking display device 200 is in the sharing state. Therefore, according to the needs of zoned anti-peeking, the on or off state of the transparent backlight module 32 can be adjusted to make the anti-peeking display device 200 in the zoned anti-peeking state or the sharing state, improving the flexibility of use of the anti-peeking display device 200.

[0067] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, combinations with each other, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A privacy film, characterized in that: include: A bottom light-transmitting film layer, a top light-transmitting film layer and an intermediate layer; The middle layer is located between the bottom light-transmitting film layer and the top light-transmitting film layer, and the middle layer includes a plurality of light-absorbing structures arranged at intervals; The privacy film further comprises a light-transmitting area, a privacy-preventing area and a transition area, wherein the transition area is located between the light-transmitting area and the privacy-preventing area; The light absorption structure located in the light-transmitting area is a first light absorption structure, the light absorption structure located in the anti-peeping area is a second light absorption structure, and the light absorption structure located in the transition area is a third light absorption structure; In the thickness direction of the privacy film, the height of the first light absorption structure is a first height h1, the height of the second light absorption structure is a second height h2, and the height of the third light absorption structure is a third height h3; Among them, h1<h3<h2, or, h1=h3<h2, or, h1<h3=h2.

2. The privacy film according to claim 1, characterized in that: The light absorption structure includes a first side length close to the bottom light-transmitting film layer, a second side length close to the top light-transmitting film layer, and a third side length and a fourth side length connecting the first side length and the second side length; The third side length and the fourth side length are symmetrical about the center of the first side length or the second side length; the angle between the third side length and the first side length is θ, 70°≤θ≤90°.

3. The privacy film according to claim 2, characterized in that: The angle between the third side length and the first side length in the first light absorption structure is θ1, the angle between the third side length and the first side length in the second light absorption structure is θ2, and the angle between the third side length and the first side length in the third light absorption structure is θ3; θ1≤θ2≤θ3.

4. The privacy film according to claim 1, characterized in that: In the direction from the light-transmitting area to the privacy-protecting area, the width of the transition area is W0; Among them, 0mm≤W0≤200mm.

5. The privacy film according to claim 1, characterized in that: The thickness of the bottom light-transmitting film layer is d1, and the thickness of the top light-transmitting film layer is d2; Among them, 0μm<d1≤250μm, 0μm<d2≤250μm.

6. The privacy film according to claim 1, characterized in that: The light absorbing structure comprises a first side length close to a side of the bottom light-transmitting film layer; The width of the first side length of the first light absorption structure is w1, the width of the first side length of the second light absorption structure is w2, and the width of the first side length of the third light absorption structure is w3; Among them, w1≤w3≤w2.

7. The privacy film according to claim 1, characterized in that: The thickness of the intermediate layer is H; Among them, 0μm<H≤200μm, 0μm≤h1≤h2≤200μm.

8. The privacy film according to claim 1, characterized in that: Along the direction from the light-transmitting area to the privacy-preventing area, the height of the third light-absorbing structure gradually increases.

9. An anti-peeping display device, characterized in that: include: A display panel, a first backlight module, and the privacy film according to any one of claims 1 to 8; The anti-peep film is located between the display panel and the first backlight module.

10. The anti-peeping display device according to claim 9, characterized in that: Also includes: Transparent backlight module; The transparent backlight module is located between the anti-peep film and the display panel.

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