Display device

Abstract

Display device (200), characterized in that the display device (200) comprises a backlight module (100), a display panel (220) and an electronically controlled side view prevention panel (210), wherein: the backlight module (100) comprises a light source (LE), a light guide plate (110), a reflection film (RF), a first optical film (120), a second optical film (130) and a third optical film (140), wherein: the light guide plate (110) has a light incidence surface (IS), a light-emitting surface (S2) and a bottom surface (S1), wherein the light-emitting surface (S2) is connected to the bottom surface (S1) by the light incidence surface (IS) and the light source (LE) is arranged on one side of the light incidence surface (IS); and the reflection film (RF) is arranged on one side of the bottom surface (S1) of the light guide plate (110); wherein the light guide plate (110) is arranged between the first optical film (120) and the reflection film (RF); wherein the first optical film (120) is arranged between the second optical film (130) and the light-emitting surface (S2) of the light guide plate (110); and wherein the second optical film (130) is arranged between the first optical film (120) and the third optical film (140), and wherein the first optical film (120), the second optical film (130) and the third optical film (140) each have a plurality of prism structures (122), the prism structures (122) of the first optical film (120) extend along a first extension direction (D1) and are arranged on a surface of the first optical film (120) that faces the light guide plate (110), the prism structures (122) of the second optical film (130) extend along a second extension direction (D2) and are arranged on a surface of the light-emitting surface (S2) of the second optical film (130) that faces away from the light guide plate (110), the prism structures (122) of the third optical film (140) extend along a third extension direction (D3) and are arranged on a surface of the light-emitting surface (S2) of the third optical film (140) that faces away from the light guide plate (110) is turned away,the second extension direction (D2) is not parallel to the first extension direction (D3) and the second extension direction (D2) is not parallel to the third extension direction (D3); , the display panel (220) is arranged to overlap the backlight module (100); and the electronically controlled side-gaze prevention panel (210) is arranged to overlap the backlight module (100), and the electronically controlled side-gaze prevention panel (210) has a side-gaze prevention mode and a common use mode.

Description

This application claims priority to the Chinese application with the id. No. 202420282413.2 filed on Feb. 6, 2024.TECHNICAL FIELDThe invention relates to a display device, and more particularly to a display device capable of controlling a range of a viewing angle.BACKGROUNDWith the development of science and technology, display devices have become generally used electronic devices. Typically, the display devices require a wide viewing angle, while some display devices require a controlled viewing angle. For example, as a vehicle moves, the brightness of on-vehicle display devices (particularly at night) may deflect drivers, as may the image displayed on those devices, both of which pose driving safety risks. However, when the vehicle is not in motion, the driver still wants to view the image displayed on the in-vehicle display device. Therefore, providing a display device that enables controlled viewing angles and has excellent filtering capabilities is an urgent issue to be addressed.The information disclosed in this "background" section is only for enhancement of understanding of the background, and therefore, it may include information that does not form the prior art already known to a person skilled in the art. Further, the information disclosed in this "Background" section does not mean that one or more problems to be solved by one or more embodiments of the utility model have been confirmed by one of ordinary skill in the art.SUMMARYAn embodiment of the utility model proposes a display device. The display device includes a backlight module, a display panel, and an electronically controlled side view prevention panel. The background module includes a light source, a light guide plate, a reflection film, a first optical film, a second optical film, and a third optical film. The light guide plate has a light incident surface, a light emitting surface, and a bottom surface. The light emitting surface and the bottom surface are connected by the light incident surface, and the light source is disposed on a side of the light incident surface. The reflection film is installed on a bottom surface side of the light guide plate. The light guide plate is disposed between the first optical film and the reflection film. The first optical film is disposed between the second optical film and the light emitting surface of the light guide plate. The second optical film is disposed between the first optical film and the third optical film. The first optical film, the second optical film, and the third optical film each have a plurality of prism structures. The prism patterns of the first optical film extend along a first extending direction and are disposed on a surface of the first optical film facing the light guide plate. The prism patterns of the second optical film extend along a second extending direction and are disposed on a surface of the light emitting surface of the second optical film opposite from the light guide plate. The prism patterns of the third optical film extend along a third extending direction and are disposed on a surface of the light emitting surface of the third optical film opposite from the light guide plate. The second extending direction is not parallel to the first extending direction, and the second extending direction is not parallel to the third extending direction. The display panel is disposed to overlap the backlight module. The electronically controlled side view prevention panel is disposed to overlap the backlight module. The electronically controlled side view prevention panel has a side view prevention mode and a sharing mode. And the display panel is disposed between the backlight module and the electronically controlled side view prevention panel.In one or more embodiments, the first extending direction may be parallel to a normal direction of the light incident surface.In one or more embodiments, the second extending direction may be parallel to the light incident surface.In one or more embodiments, an angle between the third extending direction and the light incident surface may be 95 degrees.In one or more embodiments, the reflective film may be a silver reflective filmIn one or more embodiments, the backlight module may further include a fourth optical film.In one or more embodiments, the fourth optical film may be disposed between the display panel and the third optical film.In one or more embodiments, the fourth optical film may be a dual brightness enhancement film.In one or more embodiments, the first optical film, the second optical film, and the third optical film may each further include a substrate and a microstructure layer.In one or more embodiments, the substrate may have a first surface and a second surface that are opposite each other.In one or more embodiments, the prism structures of the first optical film, the second optical film, and the third optical film may be disposed on the first surface of the substrate.In one or more embodiments, the microstructure layer may be disposed on the second surface of the substrate.In one or more embodiments, the electronically controlled side view prevention panel may be disposed between the backlight module and the display panel.In one or more embodiments, the display panel may be disposed between the backlight module and the electronically controlled side view prevention panel.In one or more embodiments, at least one compensating film may be disposed on the surface of the electronically controlled side view prevention panel.In order to make the above features and advantages of the utility model more comprehensible, specific embodiments are explained below by way of example, and detailed descriptions are provided in conjunction with the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a schematic diagram of the disassembly of the display device according to an embodiment of the utility model; FIG. 2 is a schematic diagram of the structure of the electronically controlled side view prevention panel in FIG. 1 ; FIG. 3A shows the relative brightness versus viewing angle of the display device in the sharing mode of FIG. 1 ; FIG. 3B shows the relative brightness versus viewing angle of the display device in the side view prevention mode of FIG. 1 ; FIGS. 4 and 5 are schematic diagrams of the disassembly of the display device according to other embodiments of the utility model; and FIGS. 6A and 6B are schematic cross-sectional diagrams of the first optical film, the second optical film, or the third optical film according to other embodiments of the utility model.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTSIn the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology such as "top", "bottom", "front", "back", etc. is used with reference to the orientation of the described figure(s). The components of the utility model may be arranged in a number of different orientations. Thus, directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic, and the sizes of components may be exaggerated for clarity. It is understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the invention. It is also to be understood that the terminology and terminology used herein are for the purpose of description and should not be considered as limiting. The use of "including", "comprising" or "having" and variants thereof is meant to include the items listed thereafter and equivalents thereof, as well as additional items. Unless otherwise indicated, the terms "connected," "coupled," and "attached," and variants thereof, are used herein in a broad sense and include direct and indirect connections, couplings, and modes of attachment. Also, the terms "facing", "facing", and variants thereof are used herein in a broad sense and include direct and indirect facing and "adjacent to", and variants thereof are used herein in a broad sense and include direct and indirect "adjacent to". Thus, the description of component "A" facing component "B" herein may include the situations that component "A" directly faces component "B" or one or more additional components are located between component "A" and component "B". Likewise, the description component "A" adjacent to component "B" may include the situations where component "A" is directly adjacent to component "B" or one or more additional components are located between component "A" and component "B". Accordingly, the drawings and descriptions are considered to be illustrative in nature and not restrictive.The utility model provides a display device which can effectively suppress light leakage at a large viewing angle in the narrow viewing angle mode.Other objects and advantages of the utility model can be further understood from the technical features disclosed by the utility model.FIG. 1 is a schematic diagram of the disassembly of a display device according to an embodiment of the utility model. FIG. 2 is a schematic diagram of a structure of an electronically controlled side view prevention panel in FIG. 1. FIG. 3A shows the relative brightness of the horizontal viewing angle versus the viewing angle of the device in the sharing mode. FIG. 3B shows the relative brightness of the horizontal viewing angle versus the viewing angle of the device in the side view prevention mode.Referring to FIG. 1, the display device 200 in the embodiment includes a backlight module 100, an electronically controlled side view prevention panel 210, and a display panel 220. The backlight module 100 is used to provide an illumination light beam. The electronically controlled side view prevention panel 210 and the display panel 220 are arranged to overlap the backlight module 100, for example, the electronically controlled side view prevention panel 210 and the display panel 220 are arranged in the transmission path of the illumination light beam, and the electronically controlled side view prevention panel 210 is arranged between the backlight module 100 and the display panel 220. The electronically controlled side view prevention panel 210 has a side view prevention mode and a sharing mode such that the display device 200 also has a side view prevention mode and a sharing mode accordingly. The display panel 220 is, for example, a liquid crystal display panel or another suitable non-self-luminous display panel.Specifically, as shown in FIG. 1, the backlight module 100 includes a light source LE, a light guide plate 110, a reflection film RF, a first optical film 120, a second optical film 130, and a third optical film 140. The light source LE provides a light beam. The light guide plate 110 has a light incident surface IS, a light emitting surface S 2, and a bottom surface S 1. The light emitting surface S 2 is connected to the bottom surface S 1 via the light incident surface IS. The first optical film 120, the second optical film 130, and the third optical film 140 are arranged to overlap on the light emitting surface S 2 of the light guide plate 110. The light source LE is disposed on a side of the light incident plate IS of the light guide plate 110, and the light beam provided by the light source LE enters the light guide plate 110 via the light incident plane IS. The light source LE is, for example, a light emitting diode (LED) or other light emitting elements. The reflection film RF is disposed on a bottom surface S 1 side of the light guide plate 110. The light guide plate 110 is disposed between the first optical film 120 and the reflection film RF. The first optical film 120 is disposed between the second optical film 130 and the light emitting surface S 2 of the light guide plate 110. The second optical film 130 is disposed between the first optical film 120 and the third optical film 140. That is, the backlight module 100 of the embodiment is an edge-type backlight module 100. Note that in the embodiment, the number of light sources LE is exemplified by five for the purpose of illustration, and it is not intended to limit the utility model to the content disclosed in the figures. In other embodiments, the number of light sources LE may be adjusted according to the optical design of the backlight module 100.Further, in the embodiment, as shown in FIG. 1, the first optical film 120, the second optical film 130, and the third optical film 140 include a plurality of prism structures 122, 132, 142, respectively. Specifically, the first optical film 120 includes a substrate 121 and the plurality of prism patterns 122, the second optical film 130 includes a substrate 131 and the plurality of prism patterns 132, and the third optical film 140 also includes a substrate 141 and the plurality of prism patterns 142. For example, in the embodiment, as shown in FIG. 1, the cross-sectional profiles of the prism structures 122, 132, and 142 of the first optical film 120, the second optical film 130, or the third optical film 140 of the backlight module 100 of the display device 200 may be triangular. That is, in the embodiment, the prism patterns 122, 132, and 142 of the first optical film 120, the second optical film 130, or the third optical film 140 may be a strip pattern having triangular prisms, but the utility model is not limited thereto. In other embodiments, the cross-sectional profile of the prism structures 122, 132, and 142 of the first optical film 120, the second optical film 130, or the third optical film 140 may also be adjusted according to requirements of a type of the actual light output (or light splitting effects).Further, as shown in FIG. 1, the prism patterns 122 of the first optical film 120 extend along a first extending direction D 1 and are disposed on the surface of the first optical film 120 (the substrate 121) facing the light emitting surface S 2 of the light guide plate 110, and the angle at the tip of the prism patterns 122 of the first optical film 120 is 90 degrees (or greater than 80 degrees and less than 100 degrees). The prism patterns 132 of the second optical film 130 extend along a second extension direction D 2 and are disposed on the surface of the second optical film 130 (the substrate 131) opposite from the light emitting surface S 2 of the light guide plate 110, and the angle at the tip of the prism patterns 132 of the second optical film 130 is 58 degrees (or greater than 50 degrees and less than 70 degrees). The prism patterns 142 of the third optical film 140 extend along a third extension direction D 3 and are disposed on the surface of the third optical film 140 (the substrate 141) opposite from the light emitting surface S 2 of the light guide plate 110, and the angle at the tip of the prism patterns 142 of the third optical film 140 is 90 degrees (or greater than 80 degrees and less than 100 degrees). In other words, in this embodiment, the first optical film 120 is a reverse prism sheet, and the second optical film 130 and the third optical film 140 are prism sheets.Further, in the embodiment, as shown in FIG. 1, the second extending direction D 2 is not parallel to the first extending direction D 1, and the second extending direction D 2 is not parallel to the third extending direction D 3. More specifically, in the embodiment, the first extending direction D 1 is parallel to a normal direction of the light incident surface IS (the first extending direction D 1 is perpendicular to the light incident surface IS), and the second extending direction D 2 is parallel to the light incident surface IS. An angle between the third extending direction D 3 and the light incident surface IS is 95 degrees. In this way, by disposing the first optical film 120 to the third optical film 140, the illumination light beam provided by the backlight module 100 can be further corrected in the direction of the normal direction (the regular viewing direction of the display device 200), so that the forward brightness of the backlight module 100 is increased and the oblique angle light output at a large angle of the illumination beam can be effectively reduced.In addition, in the embodiment, as shown in FIG. 1, the backlight module 100 may optionally include a fourth optical film 150 disposed between the display panel 220 and the third optical film 140. For example, in the embodiment, the fourth optical film 150 may be a double brightness enhancement film (DBEF) or a light scattering film. In this way, when the fourth optical film 150 is an enhancement film for double brightness, the light beam emitted by the light source LE of the backlight module 100 may be captured and the captured light beam may be reflected again in the backlight module 100 after multiple reflections, such that the light utilization efficiency may be increased and the brightness of the backlight module 100 may be further improved. In addition, the double brightness enhancement film may also have opacity at the same time, such that the error shielding effect of the backlight module 100 may also be improved.On the other hand, in the embodiment, the reflection film RF is, for example, a silver reflection film. In this way, by adjusting the reflection film RF, a portion of the light beam of the light source LE emitted from the bottom surface S 1 of the light guide plate 110 can be reflected by the reflection film RF and transmitted back to the light guide plate 110, so that the light energy utilization rate of the light source LE is improved. In addition, because the silver reflection film has the property of specular reflection, the light reflected back to the light guide plate 110 by the silver reflection film acting as the reflection film RF has higher directivity as compared with the diffuse reflection property reflected by the white reflection film, and the stray light can be reduced, which can further improve the forward brightness of the backlight module 100.Further, in the embodiment, as shown in FIG. 2, the electronically controlled side view prevention panel 210 includes a first polarization layer POL 1, a first substrate SUB 1, a second substrate SUB 2, a first electrode layer E 1, a second electrode layer E 2, a first alignment layer AL 1, a second alignment layer AL 2, a first liquid crystal layer LCL 1, a second polarization layer POL 2, and a compensation film CF. As shown in FIG. 2, a first electrode layer E 1 and a first alignment layer AL 1 are disposed on the surface of the first substrate SUB 1 facing the second substrate SUB 2. A second electrode layer E 2 and a second alignment layer AL 2 are disposed on the surface of the second substrate SUB 2 facing the first substrate SUB 1. The first liquid crystal layer LCL 1 is sandwiched between the first alignment layer AL 1 and the second alignment layer AL 2. As shown in FIG. 2, in the embodiment, the angle between a first alignment direction of the first alignment layer AL 1 and a second alignment direction of the second alignment layer AL 2 is, for example, 90 degrees. That is, the liquid crystal molecules LC 1 of the first liquid crystal layer LCL 1 are arranged twisted along the Z direction and the direction Z is perpendicular to the light emitting surface S 2, that is, the electronically controlled side view prevention panel 210 may be a twisted nematic (TN) type electronically controlled liquid crystal cell. In this embodiment, the total optical path difference of the electronically controlled side view prevention panel 210 is greater than 0.8 micrometers. In this embodiment, the absorption axes of the first polarizing layer POL 1 and the second polarizing layer POL 2 of the electronically controlled side view prevention panel 210 are respectively parallel or perpendicular to the alignment directions of the adjacent first alignment layer AL 1 or the second alignment layer AL 2.Further, in this embodiment, the viewing angle range of the display device 200 is electronically adjustable along the viewing angle control axis (e.g., a horizontal viewing angle). For example, when the electronically controlled side view prevention panel 210 is switched to the shared mode, the first electrode layer E 1 and the second electrode layer E 2 of the electronically controlled side view prevention panel 210 are not activated (e.g., there is no potential difference or the potential difference is less than 0.3 V), and the viewing angle ranges on the display surface of the display device 200 at different azimuth angles are approximately the same. For example, as shown in FIG. 3A, when the electronically controlled side view prevention panel 210 is switched to the shared mode, the relative brightness performance is 25% or higher in a viewing angle range of ±40 degrees (0 degrees in the front viewing direction), which allows the driver to view the display image of the display device 200 installed in the center console or in front of the front seat of the passenger.On the other hand, when the electronically controlled side view prevention panel 210 is switched to the side view prevention mode, the first electrode layer E 1 and the second electrode layer E 2 of the electronically controlled side view prevention panel 210 are activated (e.g., a potential difference is present), and the display device 200 has a narrow viewing angle range in the direction parallel to the viewing angle control axis, e.g., the light output in the lateral viewing angle range on a side of the viewing direction from the front can be effectively suppressed. Here, the viewing angle distribution of the display device 200 is unsymmetrical with respect to the viewing angle from the front. Further, by relatively configuring the prism structures 122, 132, and 142 of the first optical film 120, the second optical film 130, and the third optical film 140 of the backlight module 100, the light type and the forward brightness of the backlight module 100 can be adjusted. Thus, when the electronically controlled side view prevention panel 210 is switched to the side view prevention mode, light leakage of the display device 200 in the side view angle range of a single side can be suppressed, and the filtering capability of the display device 200 in the side view angle range (e.g., a large view angle) is effectively improved, and thus causes the display device 200 to have a superior side view prevention effect. For example, as shown in FIG. 3B, when the electronically controlled side view prevention panel 210 is switched to the side view prevention mode, the display device 200 continues to maintain a regular light output in the front angle range, and the light transmittance in the side angle range of -35 degrees to -80 degrees may be controlled to be less than 2%, and thus realizes the side view prevention mode that enables the driver to be undisturbed.In addition, in the embodiment, the brightness of the light beam of the large viewing angle of the display device 200 can be lowered by the arrangement of the compensating film CF, and therefore, the filtering capability of the display device 200 in the range of the lateral viewing angles can be improved. For example, in the embodiment, the compensation film CF may be selectively disposed between the second substrate SUB 2 and the second polarization layer POL 2. However, in other embodiments, the compensation film CF may be disposed between the first substrate SUB 1 and the first polarization layer POL 1. Alternatively, in other embodiments, the compensation film CF may be disposed on the outer sides of the first substrate SUB 1 and the second substrate SUB 2.In addition, in the conventional display device, the transmittance in the side viewing angle range of -50 degrees to -80 degrees in the side view prevention mode is still greater than 5%. However, in this embodiment, the light transmittance of the display device 200 in the range of the lateral viewing angle can be controlled from -35 degrees to -80 degrees to be below 2%, thus the light leakage of the display device 200 in the range of the lateral viewing angle on one side is virtually suppressed, the filtering capability of the display device 200 in the range of the lateral viewing angle is effectively improved, and the display device 200 therefore has a superior side view prevention effect.FIGS. 4 and 5 are schematic diagrams of the division of a display device according to other embodiments of the utility model. Reference is now made to FIGS. 4 and 5. The display devices 200A and 200B of the embodiments of FIGS. 4 and 5 are similar to the display device 200 of FIG. 1, and the differences will be described below. In the embodiment of FIG. 4, the backlight module 100A of the display device 200A further includes a light diffusing structure DF disposed between the light guide plate 110 and the first optical film 120. In the embodiment of FIG. 5, the display panel 220 of the display device 200B is disposed between the backlight module 100 and the electronically controlled side view prevention panel 210. It should be noted in particular that the fourth optical film 150 need not be included in any of the embodiments of FIGS. 1, 4, and 5.The display devices 200A and 200B may also adjust the light type and the forward brightness of the backlight module 100 by the relative configuration of the prism structures 122, 132, and 142 of the first optical film 120, the second optical film 130, and the third optical film 140 of the backlight module 100 in the above embodiment. Thus, when the electronically controlled side view prevention panel 210 is switched to the side view prevention mode, light leakage of the display device 200 in the side view angle range of one side can be suppressed, and the filtering capability of the display device in the side view angle range is effectively improved, and therefore the display devices 200A and 200B have superior side view prevention effect, and therefore can achieve similar effects and advantages to the display device 200, and redundant details need not be given here.FIGS. 6A and 6B are schematic cross-sectional diagrams of the first optical film, the second optical film, or the third optical film according to other embodiments of the utility model. Reference is now made to FIGS. 6A and 6B. The first optical films 120A and 120B, the second optical films 130A and 130B, or the third optical films 140A and 140B in the embodiment of FIGS. 6A and 6B, and the first optical film 120, the second optical film 130, or the third optical film 140 in FIG. 1 are similar, and the differences will be described below.In the embodiment of FIG. 6A, the first optical film 120A, the second optical film 130A, or the third optical film 140A may also include a microstructure layer ML (e.g., a diffusion structure layer), and thus the first optical film 120A, the second optical film 130A, or the third optical film 140A may have a specific opacity value. The microstructure layer ML is disposed on the optical film (substrate) with a prism, for example, as shown in FIG. 6A. In this way, the number of light scattering structures in the background module can be further reduced, which contributes to reducing the manufacturing cost.In the embodiment of FIG. 6B, the cross-sectional profile of the prism structures 122B, 132B, and 142B of the first optical film 120B, the second optical film 130B, and the third optical film 140B is polygonal. That is, the cross-sectional profile of the prism structures 122B, 132B, and 142B of the first optical film 120B, the second optical film 130B, and the third optical film 140B includes a plurality of polygonal drawing segments.However, the utility model is not limited to the above embodiments, and the composition and structure of the microstructure layer ML, the composition and configuration of the prism structures 122B, 132B, 142B, and other embodiments may be combined and applied according to the general opacity requirements of the optical film.In the above embodiment, the first optical films 120A, 120B, the second optical films 130A, 130B, and the third optical films 140A and 140B can still adjust the light type and the forward brightness of the background module by their relative configurations, thus they can also be applied to the background module 100 of FIGS. 1, 4, and 5. When the background module 100 is applied to the display devices 200, 200A, 200B of FIGS. 1, 4, and 5, the display devices 200, 200A, 200B can also achieve the above-mentioned functions, effects, and advantages, and redundant details need not be given here.In summary, in the display device of the utility model, by the relative configuration of the prism structures of the first optical film, the second optical film, and the third optical film of the backlight module, the light shape and the forward brightness of the backlight module can be adjusted. Thus, when the electronically controlled side view preventing panel is switched to the side view preventing mode, the light leakage of the display device in the range of the side view angle of one side can be suppressed, and the filtering capability of the display device in the range of the side view angle is effectively improved, thereby causing the display device to have a superior side view preventing effect.The foregoing description of the preferred embodiment of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or exemplary embodiments disclosed. Accordingly, the foregoing description should be considered illustrative and not restrictive. Clearly, many modifications and variations will be apparent to one skilled in the art. The embodiments are chosen and described in order to best explain the principles of the utility model and its best mode of practice, to thereby enable others skilled in the art to understand the utility model for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents, all terms being intended in their broadest, reasonable meaning unless otherwise specified. Therefore, the term "utility model" does not necessarily limit the scope of the claims to a specific embodiment, and reference to particularly preferred exemplary embodiments of the utility model does not imply any limitation to the utility model, and no such limitation is to be inferred. The utility model is only limited by the scope of the appended claims. Moreover, these claims may refer to the use of "erste(r)(s)""zweite(r)(s)"etc. followed by a headword or element. Such terms should be understood as nomenclature and should not be construed as imposing the limitation on the number of elements modified by such nomenclature unless a specific number has been given. The Summary of the Utility Model is provided to satisfy the rules that require a summary that allows a searcher to quickly ascertain the subject matter of the Technical Utility Model of each patent issued from this Utility Model. It is submitted in the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Not all advantages and benefit aspects described need to apply to all embodiments of the utility model. It should be appreciated that changes may be made in the described embodiments by those skilled in the art without departing from the scope of the invention as defined by the following claims. Moreover, regardless of whether the element or component is expressly recited in the following claims, no element or component is intended in the utility model to be made available to the public.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedCN 202420282413.2

[0001]

Claims

A display device (200), characterized in that the display device (200) comprises a backlight module (100), a display panel (220), and an electronically controlled side view preventing panel (210), wherein: the backlight module (100) comprises a light source (LE), a light guide plate (110), a reflection film (RF), a first optical film (120), a second optical film (130), and a third optical film (140), wherein: the light guide plate (110) has a light incident surface (IS), a light emitting surface (S2), and a bottom surface (S1), the light emitting surface (S2) is connected to the bottom surface (S1) through the light incident surface (IS), and the light source (LE) is disposed on a side of the light incident surface (IS); and the reflection film (RF) is disposed on a bottom surface (S1) side of the light guide plate (110); wherein the light guide plate (110) is disposed between the first optical film (120) and the reflection film (RF); wherein the first optical film (120) is disposed between the second optical film (130) and the light emitting surface (S2) of the light guide plate (110); and wherein the second optical film (130) is disposed between the first optical film (120) and the third optical film (140), and wherein the first optical film (120), the second optical film (130), and the third optical film (140) each have a plurality of prism structures (122), the prism structures (122) of the first optical film (120) extend along a first extension direction (D1) and are arranged on a surface of the first optical film (120) facing the light guide plate (110), the prism structures (122) of the second optical film (130) extend along a second extension direction (D2) and are arranged on a surface of the light emitting surface (S2) of the second optical film (130) facing away from the light guide plate (110), the prism structures (122) of the third optical film (140) extend along a third extension direction (D3) and are arranged on a surface of the light emitting surface (S2) of the third optical film (140) facing away from the light guide plate (110), the second extending direction (D2) is not parallel to the first extending direction (D3) and the second extending direction (D2) is not parallel to the third extending direction (D3); the display panel (220) is arranged to overlap the backlight module (100); and the electronically controlled side view preventing panel (210) is arranged to overlap the backlight module (100), and the electronically controlled side view preventing panel (210) has a side view preventing mode and a sharing mode.The display device according to claim 1, characterized in that the first extending direction (D1) is parallel to a normal direction of the light incident surface (IS), and the second extending direction (D2) is parallel to the light incident direction (IS).The display device according to claim 1 or 2, characterized in that an angle between the third extending direction (D3) and the light incident surface (IS) is 95 degrees.The display device according to claim 1, 2 or 3, characterized in that the reflection film (RF) is a silver reflection film.The display device according to any one of the preceding claims, characterized in that the backlight module (100) further comprises a fourth optical film (150), wherein: the fourth optical film (150) is disposed between the display panel (220) and the third optical film (140).The display device according to claim 5, characterized in that the fourth optical film (150) is a double brightness enhancement film.The display device according to any one of the preceding claims, characterized in that the first optical film (120), the second optical film (130), and the third optical film (140) each further comprise a substrate (121) and a microstructure layer (ML), wherein: the substrate (121) has a first surface and a second surface that are opposed to each other, the prism structures (122) of the first optical film (120), the second optical film (130), and the third optical film (140) are disposed on the first surface of the substrate (121); and the microstructure layer (ML) is disposed on the second surface of the substrate (121).The display device according to any one of the preceding claims, characterized in that the electronically controlled side view prevention panel (210) is disposed between the backlight module (100) and the display panel (220).The display device according to any one of the preceding claims, characterized in that the display panel (220) is disposed between the backlight module (100) and the electronically controlled side view prevention panel (210).Display device according to one of the preceding claims, characterized in that at least one compensating film (CF) is arranged on the surface of the electronically controlled side view prevention panel (210).

Images