Optical film structure, backlight module and display equipment

Abstract

The embodiment of the invention discloses an optical film structure, a backlight module and display equipment, the optical film structure comprises a base layer and a visual angle adjusting layer, and the visual angle adjusting layer is arranged on the light emitting side of the base layer; the optical film structure has a narrow visual angle mode and a wide visual angle mode, and when the optical film structure is in the narrow visual angle mode, the visual angle adjusting layer is configured to narrow light from an emitting angle to a first emitting angle; when the optical film structure is in a wide viewing angle mode, the viewing angle adjusting layer is configured to adjust the light from the emitting angle to a second emitting angle, and the second emitting angle is larger than the first emitting angle. The optical film structure has a narrow visual angle mode and a wide visual angle mode, the optical film structure comprises the base layer and the visual angle adjusting layer arranged on the light emitting side of the base layer, and switching between the narrow visual angle mode and the wide visual angle mode is achieved by adjusting the form of the visual angle adjusting layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an optical film structure, a backlight module and a display device. BACKGROUND

[0002] The liquid crystal display device in the related art comprises a display panel and a backlight module, and the backlight module is usually equipped with an optical film assembly to improve the light efficiency, such as a brightness enhancement film and a diffusion film.

[0003] In the research and practice process of the related art, the present application found that when the optical film assembly is equipped, the viewing angle of the display device cannot be adjusted by adjusting the optical film assembly. SUMMARY

[0004] The present application provides an optical film structure, a backlight module and a display device, which can realize the switching between narrow viewing angle and wide viewing angle.

[0005] The present application provides an optical film structure, which comprises:

[0006] a base layer;

[0007] a viewing angle adjusting layer arranged on the light exit side of the base layer;

[0008] The optical film structure has a narrow viewing angle mode and a wide viewing angle mode, when the optical film structure is in the narrow viewing angle mode, the viewing angle adjusting layer is configured to narrow the exit angle of light to a first exit angle; when the optical film structure is in the wide viewing angle mode, the viewing angle adjusting layer is configured to adjust the exit angle of light to a second exit angle, the second exit angle is greater than the first exit angle.

[0009] Optionally, in some embodiments of the present application, when the optical film structure is in the narrow viewing angle mode, the viewing angle adjusting layer comprises a plurality of first prisms, the first prism comprises a first side wall part extending along a first direction and a second side wall part extending along a second direction, the first direction and the second direction intersect, the first side wall part and the second side wall part are connected, a first cavity is formed between the first prism and the base layer, and the first cavity is filled with a transparent medium.

[0010] Optionally, in some embodiments of the present application, when the optical film structure is in the wide viewing angle mode, the viewing angle adjusting layer comprises a plurality of second prisms, the second prism comprises the first side wall part extending along a third direction and the second side wall part extending along a fourth direction, the third direction and the fourth direction intersect, the first side wall part and the second side wall part are connected, a second cavity is formed between the second prism and the base layer, and the second cavity is filled with the transparent medium.

[0011] The first prism has a first vertex angle formed by the first sidewall portion and the second sidewall portion, and the second prism has a second vertex angle formed by the first sidewall portion and the second sidewall portion, the second vertex angle being greater than the first vertex angle.

[0012] Optionally, in some embodiments of the present application, when the optical film structure is in the wide viewing angle mode, the connection between two adjacent second prisms is in contact with the base layer.

[0013] Optionally, in some embodiments of the present application, the first vertex angle is an acute angle or a right angle, and the second vertex angle is an obtuse angle.

[0014] Optionally, in some embodiments of the present application, when the optical film structure is in the wide viewing angle mode, the first sidewall portion and the second sidewall portion of the viewing angle adjusting layer are attached to the base layer.

[0015] When the optical film structure is in the wide viewing angle mode, the first sidewall portion and the second sidewall portion of the viewing angle adjusting layer are partially overlapped in the thickness direction of the optical film structure.

[0016] Optionally, in some embodiments of the present application, when the optical film structure is in the narrow viewing angle mode, the viewing angle adjusting layer is separated from the base layer, and the viewing angle adjusting layer and the base layer are spaced apart by the transparent medium.

[0017] Optionally, in some embodiments of the present application, when the optical film structure is in the narrow viewing angle mode, the connection between two adjacent first prisms is fixedly connected to the base layer.

[0018] Optionally, in some embodiments of the present application, the transparent medium includes one of a gas and a liquid.

[0019] Optionally, in some embodiments of the present application, the viewing angle adjusting layer includes a flexible layer and scattering particles, and the scattering particles are arranged in the flexible layer.

[0020] Correspondingly, the embodiments of the present application also provide a backlight module including the optical film structure according to any one of the above embodiments.

[0021] Correspondingly, the embodiments of the present application also provide a display device including a display panel and the backlight module according to any one of the above embodiments, and the display panel is located on the light exit side of the backlight module.

[0022] The optical film structure provided by the embodiment of the present application has a narrow viewing angle mode and a wide viewing angle mode, and the optical film structure comprises a base layer and a viewing angle adjusting layer arranged on the light exit side of the base layer. The embodiment of the present application realizes the switching of the narrow viewing angle mode and the wide viewing angle mode by adjusting the form of the viewing angle adjusting layer. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the optical film structure provided by the embodiment of the present application in a narrow viewing angle mode;

[0024] Figure 2 is a structural schematic diagram of the optical film structure provided by the embodiment of the present application in a wide viewing angle mode;

[0025] Figure 3 is a light path diagram of the optical film structure provided by the embodiment of the present application passing through the first prism and the second prism;

[0026] Figure 4 is another structural schematic diagram of the optical film structure provided by the embodiment of the present application in a narrow viewing angle mode;

[0027] Figure 5 is another structural schematic diagram of the optical film structure provided by the embodiment of the present application in a wide viewing angle mode;

[0028] Figure 6 is still another structural schematic diagram of the optical film structure provided by the embodiment of the present application in a wide viewing angle mode;

[0029] Figure 7 is a structural schematic diagram of the backlight module provided by the embodiment of the present application in a narrow viewing angle mode;

[0030] Figure 8 is a structural schematic diagram of the backlight module provided by the embodiment of the present application in a wide viewing angle mode;

[0031] Figure 9 is a structural schematic diagram of the display device provided by the embodiment of the present application in a narrow viewing angle mode;

[0032] Figure 10 is a structural schematic diagram of the display device provided by the embodiment of the present application in a wide viewing angle mode. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the embodiments can be combined with each other but are not described one by one, and the positional words such as "upper" and "lower" used are generally used to refer to the upper and lower of the device in the actual use or working state, and the specific is the direction of the drawing surface in the drawings; and "inner" and "outer" are used in relation to the outline of the device; the words "first", "second", "third" and the like are only used as labels, and do not impose a numerical requirement or establish an order.

[0034] The present application provides an optical film structure, a backlight module and a display device, which are described in detail below. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments.

[0035] Please refer to Figure 1 and Figure 2 The present application provides an optical film structure 100, which includes a base layer 11 and a viewing angle adjusting layer 12. The viewing angle adjusting layer 12 is arranged on the light-emitting side of the base layer 11.

[0036] The optical film structure 100 has a narrow viewing angle mode and a wide viewing angle mode. When the optical film structure 100 is in the narrow viewing angle mode, the viewing angle adjusting layer 12 is configured to narrow the exit angle of the light to a first exit angle. When the optical film structure 100 is in the wide viewing angle mode, the viewing angle adjusting layer 12 is configured to adjust the exit angle of the light to a second exit angle, which is greater than the first exit angle.

[0037] The optical film structure 100 of the present application realizes the switching between the narrow viewing angle mode and the wide viewing angle mode by adjusting the shape of the viewing angle adjusting layer 12.

[0038] It should be understood that in the narrow viewing angle mode, the viewing angle adjusting layer 12 is used to narrow the exit angle of the light to realize the narrow viewing angle. In the wide viewing angle mode, the viewing angle adjusting layer 12 is used to adjust the exit angle of the light to be greater than the exit angle in the narrow viewing angle mode to realize the wide viewing angle.

[0039] The viewing angle adjusting layer 12 has a certain elasticity, and has different shapes in different modes to achieve switching between narrow viewing angle and wide viewing angle. For example, in the narrow viewing angle mode, the viewing angle adjusting layer 12 is lifted by the transparent medium, and the viewing angle adjusting layer 12 is stretched to form a first prism film under the pressure of the transparent medium, thereby narrowing the viewing angle. At this time, the viewing angle adjusting layer 12 is in a stretched state, and the viewing angle adjusting layer 12 has a first elastic force. In the wide viewing angle mode, the viewing angle adjusting layer 12 has no elastic force or has a second elastic force smaller than the first elastic force, that is, the viewing angle adjusting layer 12 is not stretched by the transparent medium or is stretched to a degree smaller than that in the narrow viewing angle mode, so as to achieve wide viewing angle.

[0040] Optionally, in some embodiments, the base layer 11 is a transparent film layer, which can be in a flat and whole surface shape.

[0041] The material of the base layer 11 can be one of silicon dioxide, polyethylene, polypropylene, polystyrene, polylactic acid, polyethylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyether sulfone, aromatic fluorine toluene containing polyarylate, polycyclic olefin, polyimide or polyurethane.

[0042] Optionally, in some embodiments, the thickness of the base layer 11 is between 50 microns and 250 microns, for example, can be 50 microns, 60 microns, 70 microns, 80 microns, 90 microns, 100 microns, 110 microns, 120 microns, 130 microns, 140 microns, 150 microns, 160 microns, 170 microns, 180 microns, 190 microns, 200 microns, 210 microns, 22 microns, 230 microns, 240 microns or 250 microns.

[0043] It can be understood that the greater the thickness of the base layer 11, the greater the pressure it can resist, and the greater the light loss. Therefore, in order to meet the better support and pressure resistance performance of the base layer 11 in the narrow viewing angle mode, the thickness of the base layer 11 is selected to be between 50 microns and 250 microns.

[0044] Optionally, in some embodiments of the present application, the viewing angle adjusting layer 12 includes a flexible layer rx and scattering particles ss, and the scattering particles ss are arranged in the flexible layer rx.

[0045] It can be understood that the scattering particles ss arranged in the viewing angle adjusting layer 12 can improve the haze of the viewing angle adjusting layer 12 to strengthen the scattering effect of light and improve the uniformity of brightness. In addition, in some embodiments, the scattering particles ss in the viewing angle adjusting layer 12 can be transferred to the base layer 11 to achieve the effect of improving the uniformity of brightness; or the scattering particles ss can be saved, that is, the flexible layer rx is the viewing angle adjusting layer 12.

[0046] Optionally, the material of the flexible layer rx can be a transparent organic material, which can be one of polyethylene, polypropylene, polystyrene, polylactic acid, polyethylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyether sulfone, aromatic fluorine-containing toluene containing polyarylate, polycyclic olefin, polyimide, or polyurethane.

[0047] The thicker the thickness of the flexible layer rx, the better the performance of resisting pressure, and the more the number of doped scattering particles ss. Based on the requirement of the performance of resisting pressure and the requirement of greater haze, the thickness of the flexible layer rx is between 50 microns and 200 microns, which can be 50 microns, 60 microns, 70 microns, 80 microns, 90 microns, 100 microns, 110 microns, 120 microns, 130 microns, 140 microns, 150 microns, 160 microns, 170 microns, 180 microns, 190 microns or 200 microns.

[0048] The particle size of the scattering particles ss is between 1 micron and 30 microns, which can be 1 micron, 2 microns, 3 microns, 4 microns, 5 microns, 6 microns, 7 microns, 8 microns, 9 microns, 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, 20 microns, 21 microns, 22 microns, 23 microns, 24 microns, 25 microns, 26 microns, 27 microns, 28 microns, 29 microns or 30 microns.

[0049] It can be understood that the larger the particle size of the scattering particles ss, the thicker the thickness of the flexible layer rx required, and the smaller the density of the scattering particles ss that can be arranged in the viewing angle adjustment layer 12, and the worse the scattering effect. Therefore, the particle size of the scattering particles ss is between 1 micron and 30 microns, which can make the thickness of the viewing angle adjustment layer 12 not too thick, and the scattering effect is better.

[0050] Please refer to Figure 1 and Figure 2 In some embodiments of the present application, the viewing angle adjustment layer 12 and the base layer 11 can be arranged integrally.

[0051] When the optical film structure 100 is in the narrow viewing angle mode, the viewing angle adjustment layer 12 includes a plurality of first prisms 12a, the first prisms 12a include a first side wall portion 121 extending along a first direction m and a second side wall portion 122 extending along a second direction n. The first direction m and the second direction n intersect. The first side wall portion 121 and the second side wall portion 122 are connected. A first cavity kq1 is formed between the first prism 12a and the base layer 11, and the first cavity kq1 is filled with a transparent medium 13.

[0052] It should be noted that in the narrow viewing angle mode, the transparent medium 13 is arranged between the base layer 11 and the viewing angle adjusting layer 12. As the transparent medium 13 increases, the transparent medium 13 props up the viewing angle adjusting layer 12, so that the viewing angle adjusting layer 12 forms a prism. As the transparent medium 13 increases, the prism is gradually stretched, and the top angle of the prism gradually decreases, and the effect of narrowing the light is better. In the narrow viewing angle mode, the input amount of the transparent medium 13 can be controlled according to actual needs, so as to adjust the narrowing effect of the viewing angle adjusting layer 12 on the light.

[0053] Optionally, in the narrow viewing angle mode, the transparent medium 13 fills the first cavity kq1, so that the prism formed by the viewing angle adjusting layer 12 is a first prism 12a. The top angle of the first prism 12a is a first top angle a, which is the included angle between the extension directions of the first side wall part 121 and the second side wall part 122.

[0054] In some embodiments of the present application, when the optical film structure 100 is in the narrow viewing angle mode, the viewing angle adjusting layer 12 is arranged separately from the base layer 11, and the transparent medium 13 is arranged between the viewing angle adjusting layer 12 and the base layer 11.

[0055] It can be understood that, since the viewing angle adjusting layer 12 is arranged separately from the base layer 11, the transparent medium 13 can be input into the first cavity kq1 through a single channel, and the connection difficulty of the viewing angle adjusting layer 12 and the base layer 11 is reduced.

[0056] In addition, optionally, the four peripheral edges of the viewing angle adjusting layer 12 can be connected with the four peripheral edges of the base layer 11, or the four peripheral edge parts of the viewing angle adjusting layer 12 can be connected with the four peripheral edge parts of the base layer 11, so as to form a sealed first cavity kq1.

[0057] Optionally, in some embodiments of the present application, the transparent medium 13 includes one of a gas and a liquid. Hereinafter, the transparent medium 13 is taken as a gas as an example.

[0058] In some embodiments of the present application, when the optical film structure 100 is in the wide viewing angle mode, the viewing angle adjusting layer 12 includes a plurality of second prisms 12b. The second prism 12b includes a first side wall part 121 extending along a third direction x and a second side wall part 122 extending along a fourth direction y, and the third direction x and the fourth direction y intersect. The first side wall part 121 and the second side wall part 122 are connected. A second cavity kq2 is formed between the second prism 12b and the base layer 11, and the second cavity kq2 is filled with the transparent medium 13.

[0059] The first prism 12a has a first vertex angle a formed by the first side wall portion 121 and the second side wall portion 122. The second prism 12b has a second vertex angle β formed by the first side wall portion 121 and the second side wall portion 122. The second vertex angle β is greater than the first vertex angle a.

[0060] It should be noted that, please refer to Figure 3 , compared with the narrow viewing angle mode, the amount of transparent medium 13 of the optical film structure 100 in the wide viewing angle mode is reduced, so that the stretching degree of the first prism 12a is reduced, and the first side wall portion 121 and the second side wall portion 122 are collapsed to form the second prism 12b. Due to the collapse of the first side wall portion 121 and the second side wall portion 122, the first cavity kq1 is reduced, so that the angle of the first vertex angle a is reduced to the second vertex angle β, and the first cavity kq1 is reduced to the second cavity kq2, so that the second vertex angle β has a better effect of expanding the light exit angle compared with the first vertex angle a, thereby realizing wide viewing angle.

[0061] For example, as Figure 3 shown, the same angle of light is radiated to the first prism 12a and the second prism 12b. Because the angle of the first vertex angle a of the first prism 12a is smaller, the first prism 12a can narrow the angle of the light to a larger extent, and the second prism 12b narrows the angle to a smaller extent. Therefore, relatively speaking, the first prism 12a can realize narrow viewing angle, and the second prism 12b can realize wide viewing angle.

[0062] Optionally, in some embodiments of the present application, the first vertex angle a is an acute angle or a right angle, and the second vertex angle β is an obtuse angle.

[0063] The first vertex angle a being an acute angle or a right angle can better narrow the exit angle of the light. The second vertex angle β being an obtuse angle can better reduce the degree of narrowing of the exit angle of the light, thereby better reflecting the difference between narrow viewing angle and wide viewing angle. For example, the first vertex angle a is 45 degrees, and the second vertex angle β is 135 degrees; or the first vertex angle a is 90 degrees, and the second vertex angle β is 150 degrees.

[0064] Optionally, in some embodiments of the present application, when the optical film structure 100 is in the wide viewing angle mode, the connection portion 12c between the two adjacent second prisms 12b is in contact with the base layer 11.

[0065] It can be understood that the connection portion 12c being in contact with the base layer 11 not only makes the second cavity kq2 be reduced to the greatest extent, thereby reducing the thickness of the optical film structure 100, but also makes the viewing angle adjusting layer 12 return to the state without elastic force, thereby prolonging the service life of the viewing angle adjusting layer 12.

[0066] Optionally, the connection portion 12c can be in contact with the base layer 11 by electrostatic adsorption.

[0067] It should be noted that,Figure 1 and Figure 2 The number of prisms corresponding to the two modes is only illustrative, and does not mean that the number of prisms in the two modes is inconsistent. The number of prisms in the corresponding drawings below is also only illustrative.

[0068] Please refer to Figure 4 and Figure 5 , Figure 4 An optical film structure 100 according to one or more embodiments disclosed is shown, and is an illustrative view in a narrow viewing angle mode. Figure 5 An optical film structure 100 according to one or more embodiments disclosed is shown, and is an illustrative view in a wide viewing angle mode. Figure 4 The corresponding illustrative view in a wide viewing angle mode.

[0069] In Figure 4 and Figure 5 , the parts different from the above-mentioned embodiments will be described to avoid repeated elaboration.

[0070] Please refer to Figure 4 and Figure 5 , the viewing angle adjusting layer 12 in the optical film structure 100 is fixedly connected to the base layer 11 in a spaced manner, that is, the viewing angle adjusting layer 12 and the base layer 11 are regularly fixedly connected, such as at least one prism structure is spaced between any two fixed connection areas, such as in the narrow viewing angle mode, at least one first prism 12a is spaced between any two fixed connection areas; in the wide viewing angle mode, at least one second prism 12b is spaced between any two fixed connection areas.

[0071] Optionally, in some embodiments, when the optical film structure 100 is in the narrow viewing angle mode, the connection 12c between the two adjacent first prisms 12a is fixedly connected to the base layer 11. When the optical film structure 100 is in the wide viewing angle mode, the connection 12c between the two adjacent second prisms 12b is fixedly connected to the base layer 11.

[0072] It should be noted that the fixed connection area is the connection area of the connection 12c and the base layer 11. The connection 12c can be connected to the base layer 11 by means of gluing, but is not limited thereto, such as can be connected by means of hot melting.

[0073] The spaced fixed connection of the viewing angle adjusting layer 12 and the base layer 11 fixes the position of the prisms, avoiding the risk of easy deviation of the position of the prisms; secondly, due to the spaced fixed connection of the viewing angle adjusting layer 12 and the base layer 11, when the same first top angle α is formed in the narrow viewing angle mode, the input amount of the transparent medium 13 can be reduced, the height of the first prism 12a is reduced, and the optical film structure 100 is thinned.

[0074] Please refer to Figure 6 , Figure 6Another schematic view of the optical film structure 100 in the wide viewing angle mode according to one or more embodiments of the disclosure is shown.

[0075] In Figure 6 In the following, the parts different from the above-mentioned embodiments will be described to avoid repeated elaboration.

[0076] Please refer to Figure 6 In some embodiments of the present application, the first side wall part 121 and the second side wall part 122 of the viewing angle adjusting layer 12 are attached to the base layer 11 when the optical film structure 100 is in the wide viewing angle mode.

[0077] It should be noted that, compared with the wide viewing angle mode Figure 2 And Figure 5 The corresponding optical film structure 100, Figure 6 In the wide viewing angle mode, the transparent medium 13 is extracted from the first cavity kq1, so that the first prism 12a collapses, the first side wall part 121 and the second side wall part 122 of the viewing angle adjusting layer 12 are attached to the base layer 11, and the viewing angle adjusting layer 12 does not have a prism shape, so that the viewing angle adjusting layer 12 has a wider viewing angle at this time, that is, the light has a larger exit angle.

[0078] Optionally, the first side wall part 121 and the second side wall part 122 can be attached to the base layer 11 by electrostatic adsorption, or can be attached to the base layer 11 by vacuum adsorption.

[0079] In some embodiments of the present application, the first side wall part 121 and the second side wall part 122 of the viewing angle adjusting layer 12 are partially overlapped in the thickness direction of the optical film structure 100 when the optical film structure 100 is in the wide viewing angle mode.

[0080] Among them, the first side wall part 121 and the second side wall part 122 are partially overlapped, so that the overlapping area has better scattering effect, and the uniformity of brightness is improved.

[0081] Optionally, in some embodiments of the present application, one of the first side wall part 121 and the second side wall part 122 is provided with a fold zh, and the fold zh extends along the extension direction of the first prism 12a.

[0082] Taking the crease zh on the first sidewall portion 121 as an example, when the optical film structure 100 switches from a narrow viewing angle mode to a wide viewing angle mode, and the transparent medium 13 is removed to a certain extent, the first sidewall portion 121 bends along the crease zh to form a first folded portion 121a and a second folded portion 121b. The first folded portion 121a is attached to the base layer 11, and the second folded portion 121b is stacked on the first folded portion 121a. The first folded portion 121a and the second folded portion 121b are at least partially overlapped, while the second sidewall portion 122 collapses and is stacked on the second folded portion 121b.

[0083] The creases allow the first sidewall portion 121 and the second sidewall portion 122 to fold regularly, improving the uniformity of brightness.

[0084] Optionally, in some embodiments, the number of scattering particles ss located in the second fold 121b is less than the number of scattering particles ss located in the first fold 121b. On one hand, this makes the weight of the first fold 121a greater than the weight of the second fold 121b, giving the first fold 121a better stiffness and reducing the risk of wrinkling. On the other hand, since the second fold 121b has fewer scattering particles ss, it has better flexibility and is easier to bend. Furthermore, because the first fold 121a and the second fold 121b are stacked, the overlapping area has a double layer of scattering particles ss; therefore, the second fold 121b has fewer scattering particles ss, which can improve the overall uniformity of light emission.

[0085] Please refer to Figure 7 and Figure 8 This application also provides a backlight module BL, which includes an optical film structure 100 as described in any of the above embodiments.

[0086] It should be noted that the optical film structure of the backlight module BL in this embodiment is similar to or the same as the optical film structure 100 in any of the above embodiments, and therefore will not be described again here. Furthermore, although the backlight module BL in this embodiment is based on... Figure 1 and Figure 2 The corresponding optical film structure 100 is illustrated, but it is not limited to this; for example, it could be based on... Figure 4 and Figure 5 The corresponding optical film structure 100, or based on Figure 1 and Figure 6 The corresponding optical film structure 100 can also be Figure 4 and Figure 6 The corresponding optical film structure is 100.

[0087] In some embodiments, the backlight module BL can further include a back frame b1, a support frame b2, a first adhesive layer b3, a light emitting device plate b4, and a quantum dot film b5.

[0088] In some embodiments, the backlight module BL can further include a back frame b1, a support frame b2, a first adhesive layer b3, a light emitting device plate b4, and a quantum dot film b5.

[0089] The support frame b2 is arranged on the back frame b1 and connected with the four peripheral edges of the back frame b1 to form a receiving cavity Rn. The light emitting device plate b4 is connected to the back frame b1 by the first adhesive layer b3 and located in the receiving cavity Rn. The quantum dot film b5 is arranged on the light emitting device plate b4. The optical film structure 100 is arranged on the quantum dot film b5.

[0090] In some embodiments, the light emitting device on the light emitting device plate b4 is a blue light emitting device, and the quantum dot film b5 is used to convert the blue light into white light and emit the white light to the optical film structure 100.

[0091] It should be understood that, in some embodiments, the light emitting device plate b4 can emit white light, and thus the quantum dot film b5 can be saved.

[0092] Please refer to Figure 9 and Figure 10 The display device 1000 according to the embodiments of the present application further includes a display panel PN and the backlight module BL according to any one of the above embodiments, and the display panel PN is located on the light emitting side of the backlight module BL.

[0093] It should be understood that the backlight module of the display device 1000 according to the embodiments of the present application is similar or identical to the backlight module BL according to any one of the above embodiments, and thus will not be described herein. In addition, although the backlight module BL of the display device 1000 according to the embodiments of the present application is based on Figure 1 and Figure 2 the corresponding optical film structure 100, it is not limited thereto, and can be based on Figure 4 and Figure 5 the corresponding optical film structure 100, or based on Figure 1 and Figure 6 the corresponding optical film structure 100, or based on Figure 4 and Figure 6 the corresponding optical film structure 100.

[0094] The optical film structure 100 in the display device 1000 according to the embodiments of the present application has a narrow viewing angle mode and a wide viewing angle mode, and the optical film structure 100 includes a base layer 11 and a viewing angle adjusting layer 12 arranged on the light emitting side of the base layer 11. The embodiments of the present application realize the switching between the narrow viewing angle mode and the wide viewing angle mode of the display device 1000 by adjusting the form of the viewing angle adjusting layer 12.

[0095] Optionally, the display panel PN is a liquid crystal display panel, and a driving architecture thereof can be a driving architecture based on a fringe field switching (FFS) technology, or a driving architecture based on an in-plane switching (IPS) technology, or a driving architecture based on a vertical alignment (VA) technology.

[0096] Optionally, the display apparatus 1000 can be applied to and used in various products including, for example, a television, a notebook computer, a monitor, a billboard, an Internet of Things (IoT) device, and a portable electronic device including a mobile phone, a smart phone, a tablet personal computer, a mobile communication terminal, an electronic organizer, an electronic book, a portable multimedia player (PMP), a navigation, and an ultra-mobile personal computer (UMPC).

[0097] In addition, the display apparatus 1000 according to some embodiments can be applied to and used in a wearable device including a smart watch, a watch phone, a glasses type display, and a head-mounted display (HMD). In addition, according to some embodiments, the display apparatus 1000 can be applied to an instrument panel for a car, a central instrument panel for a car or a display screen arranged in a central information display (CID) on an instrument panel, an interior mirror display instead of a side mirror of a car, and a display of an entertainment system arranged on a back of a front seat for a rear seat passenger in a car.

[0098] The above detailed description of the optical film structure, the backlight module, and the display apparatus provided by the embodiments of the present application is provided, and the principles and embodiments of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific embodiments and application ranges will be changed according to the idea of the present application, and the above description of the present application should not be understood as a limitation.

Claims

1. An optical film structure, characterized by, The optical film structure comprises: a base layer; a viewing angle adjusting layer arranged on the light-emitting side of the base layer; the optical film structure has a narrow viewing angle mode and a wide viewing angle mode, when the optical film structure is in the narrow viewing angle mode, the viewing angle adjusting layer is configured to narrow the exit angle of light to a first exit angle; when the optical film structure is in the wide viewing angle mode, the viewing angle adjusting layer is configured to adjust the exit angle of light to a second exit angle, the second exit angle being greater than the first exit angle.

2. The optical film structure of claim 1, wherein, when the optical film structure is in the narrow viewing angle mode, the viewing angle adjusting layer comprises a plurality of first prisms, the first prisms comprise a first side wall portion extending along a first direction and a second side wall portion extending along a second direction, the first direction and the second direction intersect, the first side wall portion and the second side wall portion are connected, a first cavity is formed between the first prisms and the base layer, and the first cavity is filled with a transparent medium.

3. The optical film structure of claim 2, wherein, when the optical film structure is in the wide viewing angle mode, the viewing angle adjusting layer comprises a plurality of second prisms, the second prisms comprise the first side wall portion extending along a third direction and the second side wall portion extending along a fourth direction, the third direction and the fourth direction intersect, the first side wall portion and the second side wall portion are connected, a second cavity is formed between the second prisms and the base layer, and the second cavity is filled with the transparent medium; the first prisms have a first vertex angle formed by the first side wall portion and the second side wall portion, the second prisms have a second vertex angle formed by the first side wall portion and the second side wall portion, and the second vertex angle is greater than the first vertex angle.

4. The optical film structure of claim 3, wherein, when the optical film structure is in the wide viewing angle mode, the connection between adjacent two second prisms contacts the base layer.

5. The optical film structure of claim 3, wherein, the first vertex angle is an acute angle or a right angle, and the second vertex angle is an obtuse angle.

6. The optical film structure of claim 2, wherein, when the optical film structure is in the wide viewing angle mode, the first side wall portion and the second side wall portion of the viewing angle adjusting layer are attached to the base layer.

7. The optical film structure of claim 6, wherein, when the optical film structure is in the wide viewing angle mode, the first side wall portion and the second side wall portion of the viewing angle adjusting layer are partially overlapped in the thickness direction of the optical film structure.

8. The optical film structure according to any one of claims 2-7, wherein, when the optical film structure is in the narrow viewing angle mode, the viewing angle adjusting layer is arranged separately from the base layer, and the transparent medium is arranged between the viewing angle adjusting layer and the base layer.

9. The optical film structure of any of claims 2-3, 5-7, wherein, when the optical film structure is in the narrow viewing angle mode, the connection between adjacent two first prisms is fixedly connected to the base layer.

10. The optical film structure according to any one of claims 2-7, wherein, the transparent medium comprises one of a gas and a liquid.

11. The optical film structure according to any one of claims 1-7, wherein, the viewing angle adjusting layer comprises a flexible layer and scattering particles, and the scattering particles are arranged in the flexible layer.

12. A backlight module, characterized in that, The optical film structure comprises the viewing angle adjusting layer according to any one of claims 1-11.

13. A display device, characterized by comprising: The backlight module comprises the display panel and the backlight module according to claim 12, and the display panel is arranged on the light-emitting side of the backlight module.

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