Display device comprising a viewing angle control unit, and vehicle

Abstract

A display device can have a display panel (100) on a backlight unit (200). The backlight unit (200) can have an optical film (230) arranged parallel to the display panel (100). A viewing angle control unit (300) can be arranged between the optical film (230) and the display panel (100). The viewing angle control unit (300) can have light-blocking structures (320) extending in a first direction and optical lenses (330) on the light-blocking structures (320). The light-blocking structures (320) can be arranged at a distance from each other in a second direction perpendicular to the first direction. Each of the optical lenses (330) can have a region located between adjacent light-blocking structures (320).Each of the light-blocking structures (320) can have a stacked structure consisting of a reflective layer (321), a light-trap layer (322), and a thin metal layer (323). Thus, in the display device, the image quality, which has a narrow viewing angle, can be improved by the viewing angle control unit (300).

Description

BACKGROUND OF THE INVENTION Field of invention The present disclosure relates to a display device in which a viewing angle control unit is arranged between an optical film of a backlight unit and the display panel. Discussion of the related technology In general, a display device provides an image to a user. For example, the display device may have a display panel on an optical film of a backlight unit. The display panel can realize the image using light provided by the optical film. For example, the display panel may be a liquid crystal panel that has a liquid crystal layer. A viewing angle control unit can be positioned between the optical film of the backlight unit and the display panel. This unit may incorporate light-blocking structures extending parallel in a first direction. These structures can reduce the viewing angle of the light reaching the display panel through the optical film. For example, the image displayed on the panel may not be visible to people standing around the user in a second direction. BRIEF SUMMARY OF THE INVENTION Accordingly, the present disclosure relates to a display device that substantially eliminates one or more problems arising from limitations and disadvantages of the related technology. One objective of the present disclosure is to provide a display device that is capable of preventing or minimizing a reduction in image quality due to the viewing angle control unit. Another objective of the present disclosure is to provide a display device capable of preventing or minimizing a reduction in luminance due to the light-blocking structures. Additional advantages, objectives, and features of the disclosure are partly set forth in the following description and partly will become apparent to the person skilled in the art upon examination of the following or can be learned from the application of the disclosure. The objectives and other advantages of the disclosure can be realized and achieved by the structure set forth in particular in the written description and the claims thereto, as well as in the accompanying drawings. According to aspects of the present disclosure, display devices are provided in accordance with the independent claims. Further embodiments are described in the dependent claims. To achieve the aforementioned tasks and other advantages, and in accordance with the purpose of this disclosure as set forth and described in detail herein, a display device is provided comprising a backlighting unit. The backlighting unit has a lower light guide plate. An upper viewing angle control unit is arranged on the lower light guide plate. The viewing angle control unit has upper light-blocking structures and upper optical lenses stacked sequentially. The upper light-blocking structures are spaced apart in a first direction. Each of the upper optical lenses has a region positioned between the upper light-blocking structures. The upper light-blocking structures extend in a second direction, which is perpendicular to the first direction.Each of the upper light-blocking structures has a reflective layer, a light-trap layer, and a thin metal layer. The light-trap layer is positioned between the reflective layer and the thin metal layer. The thin metal layer is located near the display panel. The thin metal layer is thinner than the reflective layer and the light-trap layer. A display panel is mounted on the upper optical lenses of the upper viewing angle control unit. According to aspects of the present disclosure, a surface of each upper optical lens in the direction of the display panel can have a convex shape. According to aspects of the present disclosure, the light-trap layer may contain a metal oxide. According to aspects of the present disclosure, the light-trap layer may have a different metal than the thin metal layer. According to aspects of the present disclosure, the reflective layer can have the same material as the thin metal layer. According to aspects of the present disclosure, the thin metal layer can have a thickness of 12 nm to 18 nm. According to aspects of the present disclosure, the thickness of the light-trap layer can be from 30 nm to 107 nm. According to aspects of the present disclosure, the reflective layer can have a greater thickness than the light-trap layer. According to aspects of the present disclosure, a lower viewing angle control unit can be arranged between the lower light guide plate and the upper viewing angle control unit. An upper light guide plate can be arranged between the lower viewing angle control unit and the upper viewing angle control unit. The lower viewing angle control unit can have lower light-blocking structures extending parallel in the first direction. According to aspects of the present disclosure, lower optical lenses can be arranged between the lower light-blocking structures and the upper light guide plate. Each of the lower optical lenses can have a region positioned between the lower light-blocking structures, which are spaced apart in the second direction. Each of the lower light-blocking structures can have the same stacked structure as each upper light-blocking structure. In a further embodiment of the present disclosure, a display device is provided which includes a backlight unit. The backlight unit comprises a first optical film. A first viewing angle control unit is arranged on the first optical film. The first viewing angle control unit comprises first light-blocking structures, a control substrate, and optical lenses. The first light-blocking structures are arranged on a first surface of the control substrate in the direction of the first optical film. The first light-blocking structures extend in a first direction. The first light-blocking structures are arranged at a distance from each other in a second direction. The second direction is a direction perpendicular to the first direction. The optical lenses are arranged on a second surface of the control substrate.The second surface of the control substrate faces the first surface of the control substrate. Each of the optical lenses has a region positioned between the first light-blocking structures. Each of the first light-blocking structures has a structure in which a thin metal layer, a light-trap layer, and a reflective layer are stacked sequentially on the first surface of the control substrate. The light-trap layer is thicker than the thin metal layer. The reflective layer is thicker than the light-trap layer. A display panel is mounted on the optical lenses of the first viewing angle control unit. According to aspects of the present disclosure, the light-trap layer can be made of a metal oxide that has the same material as the thin metal layer. According to aspects of the present disclosure, a second viewing angle control unit can be arranged between the first viewing angle control unit and the display panel. A light guide plate can be arranged between the first viewing angle control unit and the second viewing angle control unit. A second optical film can be arranged between the light guide plate and the second viewing angle control unit. Upper light source devices are arranged side by side on a surface of the light guide plate. The second viewing angle control unit can have second light-blocking structures extending in the second direction. Each second light-blocking structure can be different from each first light-blocking structure. According to aspects of the present disclosure, each of the second light-blocking structures may contain a black dye. According to aspects of the present disclosure, the backlighting unit can comprise a light source substrate and lower light source devices. The lower light source devices can be arranged side by side on a surface of a light source substrate. The first optical film, the first viewing angle control unit, and the display panel can be arranged parallel to the light source substrate on the lower light source devices. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the present disclosure and which are incorporated into and form part of this application, represent embodiment(s) of the present disclosure and, together with the description, serve to explain the principle of the present disclosure. In the drawings: Fig. 1 is a view schematically representing a display device according to an embodiment of the present disclosure; Fig. 2 is a view along lines II' and II-II' of Fig. 1 according to an example of the present disclosure; Fig. 3 is a view showing a propagation path of light in a wide-viewing-angle mode of the display device according to an embodiment of the present disclosure; Fig.Figure 4 is a view showing a propagation path of light in a narrow viewing angle mode of the display device according to one embodiment of the present disclosure; Figure 5 is an enlarged view of a region K in Figure 4 according to an example of the present disclosure; Figures 6 and 7 are views showing the luminance distribution of light passing through the viewing angle control unit according to the configuration of the viewing angle control unit; and Figures 8, 9, 10, 11, 12, 13, 14, 15 to 16 are views showing the display device according to a further embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EXECUTION FORMS Details relating to the above-mentioned tasks, technical configurations, and operational effects of the embodiments of this disclosure will be clearly understood by the following detailed description with reference to the drawings, which depict some embodiments of this disclosure. The embodiments of this disclosure are provided here to enable the technical spirit of this disclosure to be satisfactorily conveyed to the person skilled in the art, and thus this disclosure can be implemented in other forms and is not limited to the embodiments described below. Furthermore, the same or extremely similar elements may be designated by the same reference symbols throughout the entire description, and in the drawings, the lengths and thicknesses of layers and areas may be exaggerated for convenience. It is understood that when a first element is described as being "on" a second element, although the first element may be positioned on the second element in such a way as to be in contact with the second element, a third element may be inserted between the first and second elements. Terms such as "first" and "second" may be used to distinguish one element from another. However, the first and second elements may be named arbitrarily according to the convenience of the person skilled in the art, without deviating from the technical spirit of the present disclosure. The terms used in the description of this disclosure are used solely to describe certain embodiments and are not intended to limit the scope of this disclosure. For example, an element described in the singular is understood to comprise a plurality of elements unless the context clearly indicates otherwise. Furthermore, in the description of this disclosure, the terms "comprising" and "having" will be understood to indicate the presence of specified features, integers, steps, operations, elements, components, and / or combinations thereof, but will not preclude the presence or addition of one or more further features, integers, steps, operations, elements, components, and / or combinations thereof. Furthermore, unless "directly" is used, the terms "connected" and "coupled" can encompass the fact that two components are "connected" or "coupled" by one or more other components located between them. Additionally, the term "can" fully encompasses all meanings and coverages of the term "can" and vice versa. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as they would normally be understood by a person skilled in the art in the field to which exemplary embodiments belong. It is further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or overly formal sense unless expressly defined as such herein. Designs Various embodiments of the present disclosure will now be described with reference to the drawings. All components of each display device / unit according to all embodiments of the present disclosure are operationally coupled and configured. Fig. 1 is a view schematically representing a display device according to one embodiment of the present disclosure. Fig. 2 is a view along lines II' and II-II' of Fig. 1 according to an example of the present disclosure. Referring to Figures 1 and 2, the display device according to the embodiment of the present disclosure can have a display panel 100. The display panel 100 can display an image that is provided to a user. The display panel 100 can be arranged on a backlight unit 200. The display panel 100 can display the image using light provided by the backlight unit 200. For example, the display panel 100 can be a liquid crystal panel having a liquid crystal layer. The display panel 100 can be arranged between a first linear polarizer 101 and a second linear polarizer 102. At least one of the first linear polarizer 101 and the second linear polarizer 102 can be in direct contact with the display panel 100. For example, a lower surface of the display panel 100, facing the backlight unit 200, can be in direct contact with the first linear polarizer 101, and an upper surface of the display panel 100, opposite the lower surface of the display panel 100, can be in direct contact with the second linear polarizer 102. A transmission axis of the second linear polarizer 102 can be perpendicular to a transmission axis of the first linear polarizer 101. Thus, in the display device according to the embodiment of the present disclosure, the image generated by the display panel 100 can have different luminance and contrast levels. The backlight unit 200 can include a lower light source unit 210, a lower light guide plate 220, a lower optical film 230, a reflective plate 240, an upper light guide plate 250, an upper light source unit 260 and an upper optical film 270. The lower light source unit 210 can provide light to the lower light guide plate 220 in a narrow-viewing-angle mode. For example, the lower light source unit 210 can have lower light source devices 212 mounted on a lower light source substrate 211. The lower light source substrate 211 can have various signal lines for controlling the lower light source devices 212. For example, the lower light source substrate 211 can be a printed circuit board (PCB) in which signal lines are formed. The lower light source substrate 211 can be arranged on a side face of the lower light guide plate 220. For example, the lower light source substrate 211 can extend along a side face of the lower light guide plate 220. The lower optical light source devices 212 can be arranged side by side on a surface of the lower light source substrate 211, facing the lower light guide plate 220.Each of the lower light source devices 212 can emit light that propagates towards the lower light guide plate 220. For example, each of the lower light source devices 212 can have a light-emitting diode (LED). The lower optical guide plate 220 can be arranged between the lower optical film 230 and the reflective plate 240. For example, the lower optical film 230 can be arranged on an upper surface of the lower optical guide plate 220, and the reflective plate 240 can be arranged on a lower surface of the lower optical guide plate 220 that faces the upper surface of the lower optical guide plate 220. The light supplied by the lower light source devices 212 can be supplied through the upper surface of the lower optical guide plate 220 to the entire area of ​​the lower optical film 230. The reflective plate 240 can be made of a material that has a relatively high reflectivity.Thus, in the display device according to the embodiment of the present disclosure, the light emitted through the lower surface of the lower light guide plate 220 can be reflected by the reflective plate 240 towards the lower optical film 230. Therefore, in the display device according to the embodiment of the present disclosure, the efficiency of the lower light source unit 210 can be improved. The light emitted through the upper surface of the lower light guide plate 220 can have uniform properties throughout the lower optical film 230. For example, the lower optical film 230 can have at least one lower prism film 231 and 232. Each of the lower prism films 231 and 232 can have first prisms pr arranged side by side on a surface of the first film substrate ss. The first foil substrate ss can be made of a transparent material. For example, the first foil substrate s1 can be made of plastic. The first prisms pr can extend parallel in one direction. One direction of extension of each prism pr can be perpendicular to one direction of extension of the lower light source substrate 211. For example, the lower light source substrate 211 can be located on a side face of the lower light guide plate 220 extending in a first direction X, and each of the first prisms pr can extend in a second direction Y perpendicular to the first direction X on a top surface of the first foil substrate ss, opposite the lower light guide plate 220. The first prisms p1 can be arranged side by side in the first direction X.Thus, in the display device according to the embodiment of the present disclosure, the light emitted through the upper surface of the lower light guide plate 220 can be scattered by the first prisms pr in the first direction X. For example, a deviation in luminance caused by the lower light source devices 212, which are arranged side by side in the first direction X, can be attenuated by the first prisms pr. Therefore, in the display device according to the embodiment of the present disclosure, the uniformity of the light passing through the lower optical film 230 can be improved. The upper light guide plate 250 can be arranged on the lower light guide plate 220. The upper light guide plate 250 can be arranged parallel to the lower light guide plate 220 and the lower optical film 230. A lower surface of the upper light guide plate 250, facing the lower light guide plate 220, can overlap with the lower optical film 230. Thus, in the display device according to the embodiment of the present disclosure, the light passing through the lower optical film 230 can be provided at the upper light guide plate 250. The upper light source unit 260 can provide light to the upper light guide plate 250 in a wide-viewing-angle mode. For example, the upper light source unit 260 can have upper light source devices 262 mounted on an upper light source substrate 261. The upper light source substrate 261 can have various signal lines for controlling the upper light source devices 262. For example, the upper light source substrate 261 can be a printed circuit board (PCB) in which signal lines are formed. The upper light source substrate 261 can have the same stacked structure as the lower light source substrate 211. The upper light source substrate 261 can be arranged on a side face of the upper light guide plate 250. For example, the upper light source substrate 261 can extend along a side face of the upper light guide plate 250. A side face of the upper light guide plate 250 oriented towards the upper light source substrate 261 can extend in a different direction than the side face of the lower light guide plate 220 oriented towards the lower light source substrate 211. For example, the upper light source substrate 261 can be arranged on a side face of the upper light guide plate 250 that extends in the second direction Y. The upper light source devices 262 can be arranged on a surface of the upper light source substrate 261, facing the upper light guide plate 250. Each of the upper light source devices 262 can emit light toward the upper light guide plate 250. For example, each of the upper light source devices 262 can have a light-emitting diode (LED). Each of the upper light source devices 262 can have the same or a similar structure as each lower light source device 212, or it can have a different structure than each lower light source device 212. The upper optical film 270 can be arranged on an upper surface of the upper light guide plate 250, opposite the lower surface of the upper light guide plate 250. The light passing through the lower optical film 230 and the light supplied by the upper light source devices 262 can be supplied through the upper surface of the upper light guide plate 250 to an entire area of ​​the upper optical film 270. The upper optical film 270 can be arranged parallel to the lower light guide plate 220, the lower optical film 230, and the upper light guide plate 250. The light emitted through the upper surface of the upper light guide plate 250 can have uniform properties throughout the upper optical film 270. For example, the upper optical film 270 can have at least one upper prism film 271 and 272. Each of the upper prism films 271 and 272 can have the same or a similar structure as each of the lower prism films 231 and 232. For example, each of the upper prism films 271 and 272 can have second prisms pr arranged side by side on the surface of a second film substrate ss. The second film substrate ss can be made of a transparent material. For example, the second film substrate ss can be made of plastic. The second film substrate ss can be made of the same material as the first film substrate ss. The second prisms pr can extend parallel in one direction. An extension direction of each second prism pr can be perpendicular to an extension direction of the upper light source substrate 261. For example, the second prisms pr can be arranged side by side in the second direction Y, and each of the second prisms pr can extend in the first direction X on the upper surface of the second film substrate ss, which is opposite the upper light guide plate 250. Thus, in the display device according to the embodiment of the present disclosure, the light supplied by the upper light source devices 262 to the upper light guide plate 250 can be scattered by the second prisms pr in the second direction Y. Therefore, in the display device according to the embodiment of the present disclosure, the uniformity of the light passing through the upper optical film 270 can be improved. A first viewing angle control unit 300 can be arranged between the lower optical film 230 and the upper light guide plate 250. The first viewing angle control unit 300 can limit the viewing angle of the light passing through the lower optical film 230. For example, the first viewing angle control unit 300 can include first light-blocking structures 320 and optical lenses 330. The first light-blocking structures 320 and the optical lenses 330 are supported by a control substrate 310. The control substrate 310 can be made of a transparent material. The control substrate 310 can be made of an insulating material. For example, the control substrate 310 can be made of glass or plastic. The control substrate 310 can be arranged parallel to the lower optical film 230 and the upper light guide plate 250. For example, a lower surface of the control substrate 310 oriented towards the lower light guide plate 220 can overlap with the lower optical film 230, and the upper light guide plate 250 can overlap with an upper surface of the control substrate 310 oriented towards the upper optical film 270. The first light-blocking structures 320 can be arranged side by side on the lower surface of the control substrate 310. Each of the first light-blocking structures 320 can extend in the second direction Y. The first light-blocking structures 320 that are adjacent in the first direction X can be spaced apart from each other. Each of the first light-blocking structures 320 can have a thin metal layer 323, a light-trap layer 322, and a reflective layer 321, which are stacked sequentially on the lower surface of the control substrate 310. For example, the thin metal layer 323 of each first light-blocking structure 320 can be in direct contact with the lower surface of the control substrate 310. The reflective layer 321 of each first light-blocking structure 320, which is located near the lower optical film 230, can be made of a material with a high reflectivity. For example, the reflective layer 321 of each first light-blocking structure 320 can be a metal, such as aluminum (Al), silver (Ag), copper (Cu), nickel (Ni), chromium (Cr), and tungsten (W). Thus, in the display device according to the embodiment of the present disclosure, the viewing angle of the light passing through the lower optical film 230 in the first direction can be reduced mainly by the reflective layer 321 of each first light-blocking structure 320.For example, in the display device according to the embodiment of the present disclosure, the light provided to the user, which passes through the lower optical film 230, cannot be perceived by persons located next to the user in the first direction due to the reflective layer 321 of each first light-blocking structure 320. Therefore, in the display device according to the embodiment of the present disclosure, the image produced by the light passing through the lower optical film 230 and the first viewing angle control unit 300 cannot be shared with persons located next to the user in the first direction X. The light-trap layer 322 of each first light-blocking structure 320 can be arranged between the reflective layer 321 and the thin metal layer 323 of the corresponding light-blocking structure 320. The light-trap layer 322 of each first light-blocking structure 320 can be made of a material with a relatively low transmittance. For example, the light-trap layer 322 of each first light-blocking structure 320 can be a metal oxide. The light-trap layer 322 of each first light-blocking structure 320 can be a different metal than the reflective layer 321 of the corresponding first light-blocking structure 320.Thus, in the display device according to the embodiment of the present disclosure, a portion of the light supplied to the light-trap layer 322 of each first light-blocking structure 320 can be absorbed by the light-trap layer 322 of the corresponding first light-blocking structure 320. For example, the light-trap layer 322 of each first light-blocking structure 322 can comprise a light-absorbing material. The thin metal layer 323 of each first light-blocking structure 320, located near the upper light guide plate 250, can be a translucent layer in which a metal is thinly formed. The thin metal layer 323 of each first light-blocking structure 320 can be the same metal as the reflective layer 321 of the corresponding first light-blocking structure 320. For example, the thin metal layer 323 of each first light-blocking structure 320 can be a thin layer formed from at least one of aluminum (Al), silver (Ag), copper (Cu), nickel (Ni), chromium (Cr), and tungsten (W). The thin metal layer 323 of each first light-blocking structure 320 can be thinner than the reflective layer 321 and the light-trap layer 322 of the corresponding first light-blocking structure 320.Thus, in the display device according to the embodiment of the present disclosure, a portion of the light propagating towards the lower light guide plate 220 by passing through the control substrate 310 can be provided to the light trap layer 322 of each first light-blocking structure 320 by passing through the thin metal layer 323 of the corresponding first light-blocking structure 320. Therefore, in the display device according to the embodiment of the present disclosure, a portion of the light propagating towards the lower light guide plate 220 by passing through the control substrate 310 can be absorbed by the light trap layer 322 of each first light-blocking structure 320. The light passing through the thin metal layer 323 and the light-trap layer 322 of each first light-blocking structure 320 can be reflected by the reflective layer 321 of the corresponding first light-blocking structure 320. At least a portion of the light reflected by the reflective layer 321 of each first light-blocking structure 320 can be reflected at a boundary between the light-trap layer 322 and the thin metal layer 323 of the corresponding first light-blocking structure 320. Thus, in the display device according to the embodiment of the present disclosure, at least a portion of the light passing through the thin metal layer 323 of each first light-blocking structure 320 can be trapped between the reflective layer 321 and the thin metal layer 323 of the corresponding first light-blocking structure 320.The light trapped between the reflective layer 321 and the thin metal layer 323 of each first light-blocking structure 320 can be slowly absorbed into the light-trap layer 322 of the corresponding first light-blocking structure 320. Therefore, in the display device according to the embodiment of the present disclosure, at least some of the light propagating towards the lower light guide plate 220 by passing through the control substrate 310 can be removed by the first light-blocking structure 320. This means that, in the display device according to the embodiment of the present disclosure, the reflection of the light propagating towards the lower light guide plate 220 by passing through the control substrate 310 can be reduced by the reflective layer 321 of each first light-blocking structure 320. The optical lenses 330 can be arranged side by side on the upper surface of the control substrate 310. For example, the optical lenses 330 can be arranged side by side on the upper surface of the control substrate 310 in the first direction X. The optical lenses 330 can be arranged such that they are in contact with each other or spaced apart in the first direction X. Each of the optical lenses 330 can have a region that is located in the first direction X between adjacent first light-blocking structures 320. For example, the light passing between the first light-blocking structures 320 can be focused by one of the optical lenses 330. Each of the optical lenses 330 can function as a convex lens. For example, a surface of each optical lens 330 can have a convex shape in the direction of the upper light guide plate 250.The optical lenses 330 can extend in the second direction Y. Thus, in the display device according to the embodiment of the present disclosure, the viewing angle of the light passing through the lower optical film 230 in the first direction X can be secondarily reduced by the optical lenses 330. Therefore, in the display device according to the embodiment of the present disclosure, the viewing angle of the light passing through the lower optical film 230 in the first direction can be significantly reduced by the first light-blocking structure 320 and the optical lenses 330. Furthermore, in the display device according to the embodiment of the present disclosure, the front-side luminance of the light passing between the first light-blocking structures 320 can be increased by the optical lenses 330. A lower surface of each optical lens 330 in the direction of the lower light guide plate 220 can be larger than any first light-blocking structure 320. A lower surface of each optical lens 330 in the direction of the lower light guide plate 220 can be larger than the space between the first light-blocking structures 320. For example, the length of the lower surface of each optical lens 330 in the first direction X can be equal to the spacing of the first light-blocking structures 320 in the first direction X. Thus, in the display device according to the embodiment of the present disclosure, a section of each optical lens 330 between the first light-blocking structures 320 can have a substantially constant shape.This means that in the display device according to the embodiment of the present disclosure, the light passing between the first light-blocking structures 320 can be focused by the optical lenses 330 in a substantially constant direction. Therefore, in the display device according to the embodiment of the present disclosure, a reduction in the uniformity of the light due to the optical lenses 330 can be prevented or reduced. A second viewing angle control unit 400 can be arranged between the upper optical film 270 of the backlight unit 200 and the display panel 100. The second viewing angle control unit 400 can limit the viewing angle of the light passing through the upper optical film 270. For example, the second viewing angle control unit 400 can have second light-blocking structures 430 arranged between a first control substrate 410 and a second control substrate 420. The first control substrate 410 and the second control substrate 420 can be made of a transparent material. For example, the first control substrate 410 and the second control substrate 420 can be made of plastic or glass. The second control substrate 420 can be made of the same material as the first control substrate 410. The second light-blocking structures 430 can be arranged side by side between the first control substrate 410 and the second control substrate 420. The second light-blocking structures 430 can be arranged side by side in the second direction Y. Each of the second light-blocking structures 430 can have a shape that extends in a third direction Z perpendicular to the first direction X and the second direction Y. For example, each of the second light-blocking structures 430 can be in direct contact with at least one upper surface of the first control substrate 410 in the direction of the second control substrate 420 and one lower surface of the second control substrate 420 in the direction of the first control substrate 410. The second light-blocking structures 430 can intersect the first light-blocking structure 320. For example, each of the second light-blocking structures 430 can extend in the first direction.The second light-blocking structures 430, which are adjacent in the second direction Y, can be arranged at a distance from each other. The structure of each second light-blocking structure 430 can differ from the structure of each first light-blocking structure 320. For example, each of the second light-blocking structures 430 can be made of a light-blocking material. The light-blocking material can contain a black dye, such as carbon black. Thus, in the display device according to the embodiment of the present disclosure, the viewing angle of the light passing through the upper optical film 270 in the second direction Y can be reduced by the second light-blocking structures 430.For example, in the display device according to the embodiment of the present disclosure, the light emitted by the upper light source devices 262 and passing through the upper optical film 270 can be provided to persons or objects located next to the user in the second direction Y by the second light-blocking structure 430. Furthermore, in the display device according to the embodiment of the present disclosure, the viewing angle of the light provided to the user by passing through the lower optical film 230 and the upper optical film 270 can be limited in the first direction X and the second direction Y. The second light-blocking structures 430 can be surrounded by a structure-insulating layer 440. The structure-insulating layer 440 can have the same thickness as each second light-blocking structure 430. For example, the space between the first control substrate 410 and the second control substrate 420 can be completely filled by the second light-blocking structures 430 and the structure-insulating layer 440. Thus, in the display device according to the embodiment of the present disclosure, deformation of the second light-blocking structures 430 due to external influences can be prevented or reduced. Therefore, in the display device according to the embodiment of the present disclosure, distortion of the image by the light passing through the second viewing angle control unit 400 can be prevented. The structural insulating layer 440 can comprise an insulating material. The structural insulating layer 440 can comprise a transparent material. The refractive index of the structural insulating layer 440 can be substantially equal to the refractive index of the first control substrate 410 and the refractive index of the second control substrate 420. Therefore, in the display device according to the embodiment of the present disclosure, a loss of light due to a difference in refractive index between the first control substrate 410 and the structural insulating layer 440 and between the structural insulating layer 440 and the second control substrate 420 can be minimized or reduced. Fig. 3 is a view showing a propagation path of light in the wide-viewing-angle mode of the display device according to the embodiment of the present disclosure. Referring to Figs. 1, 2 to 3, the upper light source devices 262 can emit light in the direction of the upper light guide plate 250 in the wide viewing angle mode of the display device according to the embodiment of the present disclosure. Thus, in the wide viewing angle mode of the display device according to the embodiment of the present disclosure, the light passing through the upper light guide plate 250 and the upper optical film 270 can be supplied to the display panel 100 by the second viewing angle control unit 400. This means that in the wide viewing angle mode of the display device according to the embodiment of the present disclosure, the light supplied to the display panel 100 does not pass through the first viewing angle control unit 300.For example, in the wide-viewing-angle mode of the display device according to the embodiment of the present disclosure, the light emitted by the upper light source devices 262 can have a first light WL1 that passes between the second light-blocking structures 430 of the second viewing-angle control unit 400, and a second light WL2 that is blocked by the second light-blocking structures 430 of the second viewing-angle control unit 400. Therefore, in the wide-viewing-angle mode of the display device according to the embodiment of the present disclosure, the viewing angle of the light provided at the display panel 100 can be unlimited in the first direction X. Fig. 4 is a view showing a propagation path of light in the narrow-angle viewing mode of the display device according to the embodiment of the present disclosure. Fig. 5 is an enlarged view of a region K in Fig. 4 according to an example of the present disclosure. Referring to Figs. 1, 2, 4 and 5, the lower light source devices 212 can emit light in the direction of the lower light guide plate 220 in the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, and the upper light source devices 262 do not emit light. Thus, in the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, the light emitted through the upper surface of the lower light guide plate 220 can be provided to the display panel 100 by the first viewing angle control unit 300 and the second viewing angle control unit 400.For example, in the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, the light emitted by the lower light source devices 212 may include a third light NL1 that passes between the first light-blocking structures 320 of the first viewing angle control unit 300 and between the second light-blocking structures 430 of the second viewing angle control unit 400, and a fourth light NL2 that is blocked by the reflective layer 321 of the first viewing angle control unit 300.Therefore, in the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, the viewing angle of the light provided in the first direction X at the display panel 100 can be limited by the first viewing angle control unit 300, and the viewing angle of the light provided in the second direction Y at the display panel 100 can be limited by the second viewing angle control unit 400. This means that in the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, both the viewing angle of the light provided in the first direction X at the display panel 100 and the viewing angle of the light provided in the second direction Y at the display panel 100 can be limited. In the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, a portion of the light passing through the first viewing angle control unit 300 can be reflected at the lower surface 250LS of the upper light guide plate 250. The light Lr reflected through the lower surface 250LS of the upper light guide plate 250 can be provided at the light trap layer 322 of one of the first light-blocking structures 320 (as an example of the first light-blocking structure 320 adjacent to the space between the first light-blocking structures 320 through which the light emitted by the lower light source devices 212 passes, without being limited thereto) by passing through the thin metal layer 323 of the corresponding light-blocking structure 320.The light-trap layer 322 of each first light-blocking structure 320 can absorb at least a portion of the supplied light. At least a portion of the light supplied to the light-trap layer 322 of each first light-blocking structure 320 can be trapped between the reflective layer 321 and the thin metal layer 323 of the corresponding first light-blocking structure 320. Thus, in the narrow-viewing-angle mode of the display device according to the embodiment of the present disclosure, the reflection of the light Lr reflected at the lower surface 250LS of the upper light guide plate 250 by the reflective layer 321 of each first light-blocking structure 320 can be significantly reduced.For example, in the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, most of the light Lr reflected from the lower surface 250LS of the upper light guide plate 250 can be removed by the first light-blocking structures 320. Therefore, in the narrow viewing angle mode of the display device according to the embodiment of the present disclosure, the viewing angle of the light provided in the first direction X at the display panel 100 cannot be increased by the light Lr reflected from the lower surface 250LS of the upper light guide plate 250. Fig. 6 is a view showing the luminance distribution of light passing through the viewing angle control unit, which has light-blocking structures made of light-blocking material. Fig. 7 is a view showing the luminance distribution of light passing through the viewing angle control unit, in which each of the light-blocking structures has a stacked structure consisting of the reflective layer, the light-trap layer, and the thin metal layer. Referring to Fig. 6 and Fig. 7, the front-side luminance of the light passing through the viewing angle control unit, in which each of the light-blocking structures has a stacked structure of the reflective layer, the light-trap layer and the thin metal layer, can be higher than the front-side luminance of the light passing through the viewing angle control unit, which has the light-blocking structures made of light-blocking material.This means that in the display device according to the embodiment of the present disclosure, which includes the first viewing angle control unit 300, the front-side luminance of the light provided to the display panel 100 in the narrow viewing angle mode may be improved compared to the comparison display device in which the first viewing angle control unit 300 is replaced by a viewing angle control unit having light-blocking structures made of a light-blocking material. Therefore, in the display device according to the embodiment of the present disclosure, the quality of the image provided to the user in the narrow viewing angle mode may be improved. Accordingly, the display device according to the embodiment of the present disclosure can have the first viewing angle control unit 300 between the lower optical film 230 and the upper light guide plate 250 of the backlight unit 200 and the second viewing angle control unit 400 between the upper optical film 270 of the backlight unit 200 and the display panel 100, wherein the first viewing angle control unit 300 can have a stacked structure of the first light-blocking structures 320 and the optical lenses 330, wherein each of the optical lenses 330 can have a region that is arranged between the first light-blocking structures 320, which are arranged at a distance from each other in the first direction X, wherein each of the first light-blocking structures 320, which extend in the second direction Y, has a stacked structure of the reflective layer 321,the light-trap layer 322 and the thin metal layer 323, wherein the thin metal layer 323, which is arranged near the display panel 100, can have a smaller thickness than the reflective layer 321 and the light-trap layer 322. Thus, in the display device according to the embodiment of the present disclosure, the viewing angle of the light provided by the lower optical film 230 in the first direction X at the display panel 100 can be limited by the first light-blocking structures 320, and the front-side luminance of the light provided by the lower optical film 230 at the display panel 100 can be improved by the optical lenses 330. Therefore, in the display device according to the embodiment of the present disclosure, the image realized by the display panel 100 in the wide-viewing-angle mode can be clearly visible to the user and persons,The image displayed by the display panel 100 in the narrow viewing angle mode may not be visible to people located in the first direction X next to the user, and the quality of the image provided to the user by the display panel 100 in the narrow viewing angle mode may be improved. Table 1 shows the reflectance ratio of the first light-blocking structure 320 as a function of the thickness of the light-trap layer 322. Table 2 shows the reflectance ratio of the first light-blocking structure 320 as a function of the thickness of the thin metal layer 323. Tables 1 and 2 give values ​​measured in a structure where the light-trap layer 322, made of copper oxide (Cu), is positioned between the reflective layer 321 and the thin metal layer 323, which is made of a nickel-chromium (NiCr) alloy, and the reflective layer 321 has a greater thickness than the light-trap layer 322. [Table 1] [Table 1] Reflectance ratio (%) 52.00 13.6 77.4 47.6 67.5 97.5 6 10.1 012.3 3 [Table 2] [Table 2] Reflectance ratio (%) 14.25 7.29 7.44 9.84 12.39 15.17 Referring to Table 1, if the light-trap layer 322 has a thickness of 17 nm to 107 nm, the reflectance of the first light-blocking structure 320 can be minimized or reduced. Referring to Table 2, if the thickness of the thin metal layer 323 is 12 nm to 18 nm, the reflectance of the first light-blocking structure 320 can be minimized or reduced. This means that in the display device according to the embodiment of the present disclosure, the light-trap layer 322 of each first light-blocking structure 320 can have a thickness of 17 nm to 107 nm, the thin metal layer 323 of each first light-blocking structure 320 can have a thickness of 12 nm to 18 nm, and the reflective layer 321 of each first light-blocking structure 320 can have a greater thickness than the light-trap layer 322 of the corresponding first light-blocking structure 320.Thus, in the display device according to the embodiment of the present disclosure, the increase in the viewing angle in the first direction X caused by the light Lr reflected from the lower surface 250LS of the upper light guide plate 250 can be significantly reduced in the narrow viewing angle mode. Therefore, in the display device according to the embodiment of the present disclosure, the quality of the image provided to the user in the narrow viewing angle mode can be greatly improved. The display device according to the embodiment of the present disclosure is described such that the light-trap layer 322 of each first light-blocking structure 320 comprises a different material than the reflective layer 321 and the thin metal layer 323 of the corresponding first light-blocking structure 320. However, in the display device according to a further embodiment of the present disclosure, the light-trap layer 322 of each first light-blocking structure 320 can be made of a metal oxide that comprises the same material as the reflective layer 321 and the thin metal layer 323 of the corresponding first light-blocking structure 320.For example, in the display device according to a further embodiment of the present disclosure, a process for forming the first light-blocking structures 320 may comprise a step of forming a metal layer, a step of forming a metal oxide layer by oxidizing a surface of the metal layer, a step of forming the thin film layer having the same material as the metal layer on the metal oxide layer, a step of forming the thin metal layer 323 of each first light-blocking structure 320 by structuring the thin film layer, a step of forming the light-trap layer 322 of each first light-blocking structure 320 by structuring the metal oxide layer, and a step of forming the reflective layer 321 of each first light-blocking structure 320 by structuring the metal layer.Thus, in the display device according to a further embodiment of the present disclosure, a process for forming the first light-blocking structures 320 can be simplified. The display device according to the embodiment of the present disclosure is described such that each of the first light-blocking structures 320 has a three-layer structure. However, in the display device according to a further embodiment of the present disclosure, each of the first light-blocking structures 320 can have different stacked structures. For example, in the display device according to a further embodiment of the present disclosure, each of the first light-blocking structures 320 can have a blocking layer 324 on a lower surface of the reflective layer 321 in the direction of the lower light guide plate, as shown in Fig. 8. The blocking layer 324 can prevent reflection of the light at the lower surface of the reflective layer 321. For example, the blocking layer 324 can have an absorbing material.The blocking layer 324 can comprise an organic or an inorganic material. For example, the blocking layer 324 can comprise a metal oxide. Thus, in the display device according to a further embodiment of the present disclosure, defects due to the light reflected from the lower surface of the reflective layer 321 can be reduced. The display device according to the embodiment of the present disclosure is described such that the light-trap layer 322 of each first light-blocking structure 320 is in direct contact with the reflective layer 321 and the thin metal layer 323 of the corresponding first light-blocking structure 320. However, in the display device according to a further embodiment of the present disclosure, the light-trap layer 322 of each first light-blocking structure 320 can be arranged at a distance from the reflective layer 321 and / or the thin metal layer 323 of the corresponding first light-blocking structure 320. For example, in the display device according to a further embodiment of the present disclosure, each of the first light-blocking structures 320 can have an absorbing layer 325 arranged between the reflective layer 321 and the light-trap layer 322, as shown in Fig. 9.The absorbing layer 325 can have a lower transmittance than the light-trap layer 322. For example, the absorbing layer 325 can have an absorbing material that has a higher efficiency than the light-trap layer 322. Thus, in the display device according to a further embodiment of the present disclosure, the reflectance of the light provided by the thin metal layer 323 of the corresponding light-blocking structure 320 to the light-trap layer 322 of each first light-blocking structure 320 can be effectively prevented or reduced. Therefore, in the display device according to a further embodiment of the present disclosure, the quality of the image provided to the user in the narrow-viewing-angle mode can be effectively improved. As shown in Fig. 10, in the display device according to a further embodiment of the present disclosure, each of the first light-blocking structures 320 can have a transflective layer 326 arranged between the absorbing layer 325 and the light-trap layer 322. The transflective layer 326 can be made of a metal. For example, the transflective layer 326 can be made of the same material as the reflective layer 321 and the thin metal layer 323. The transflective layer 326 can be thicker than the light-trap layer 322 and the thin metal layer 323. Some of the light supplied to the light-trap layer 322 through the thin metal layer 323 can pass through the transflective layer 326. The transflective layer 326 can reflect some of the light supplied to the light-trap layer 322 through the thin metal layer 323.Thus, in the display device according to a further embodiment of the present disclosure, the light supplied to the light-trap layer 322 through the thin metal layer 323 can be trapped between the transflective layer 326 and the thin metal layer 323, or supplied to the absorbing layer 325 by passing through the transflective layer 326. Likewise, in the display device according to a further embodiment of the present disclosure, at least a portion of the light supplied to the absorbing layer 325 can be trapped between the reflective layer 321 and the transflective layer 326. Therefore, in the display device according to a further embodiment of the present disclosure, the light reflected from the lower surface of the upper light guide plate 250 can be effectively removed by the first light-blocking structures 320.This means that in the display device according to a further embodiment of the present disclosure, the quality of the image provided to the user can be greatly improved. In the display device according to a further embodiment of the present disclosure, a side surface of each first light-blocking structure 320 can have different shapes. For example, in the display device according to a further embodiment of the present disclosure, a side surface of the first light-blocking structure 320 can have an uneven shape, as shown in Fig. 11. A side surface shape of each first light-blocking structure 320 can be different from a side surface shape of adjacent first light-blocking structures 320. Thus, in the display device according to a further embodiment of the present disclosure, a moiré phenomenon due to a repeated arrangement of the first light-blocking structures 320 can be prevented or reduced. The side surface of the first light-blocking structure 320 can have an uneven shape in the second direction Y.For example, the side surface of the first light-blocking structure 320 can have a planar shape in the second direction Y. Edges of each layer of the first light-blocking structure 320 can be aligned with each other in the third direction Z. The display device according to the embodiment of the present disclosure is described such that the lower optical film 230 is arranged between the lower light guide plate 220 and the first viewing angle control unit 300. However, in the display device according to a further embodiment of the present disclosure, the light generated by the lower light source unit 210 can be supplied directly to the lower optical film 230. For example, in the display device according to a further embodiment of the present disclosure, the lower light source substrate 211 of the lower light source unit 210 can be arranged parallel to the lower optical film 230, and the lower light guide plate and the reflecting plate can be omitted, as shown in Fig. 12.Thus, in the display device according to a further embodiment of the present disclosure, each of the lower light source devices 212 can emit light in the direction of the lower optical film 230. This means that in the display device according to a further embodiment of the present disclosure, the backlight unit 200 can be a direct-type backlight unit. Therefore, in the display device according to a further embodiment of the present disclosure, the lower light guide plate and the reflecting plate can be omitted. In the display device according to a further embodiment of the present disclosure, the lower optical film 230 can comprise a diffusion film. Thus, in the display device according to the embodiment of the present disclosure, the light emitted by the lower light source unit 210 can be uniformly provided to the entire area of ​​the display panel 100. Furthermore, in the display device according to the embodiment of the present disclosure, the luminance of the light passing through the lower optical film 230 can be improved. Reflective structures 213 can be arranged between the lower light source devices 212. The light reflected by the reflective layer 321 of each first light-blocking structure 320 can be reflected by one of the reflective structures 213 towards the upper light guide plate 250. Thus, in the display device according to a further embodiment of the present disclosure, the quality of the image provided to the user in the narrow viewing angle mode can be improved. The lower light source devices 212 and the reflective structures 213 can be covered by a light source planarization layer 214. The light source planarization layer 214 can be a transparent material. The light source planarization layer 214 can be an adhesive material. For example, the light source planarization layer 214 can be applied directly to a surface of the lower light source substrate 211 between the lower light source devices 212 and the reflective structures 213. Thus, in the display device according to a further embodiment of the present disclosure, the lower light source devices 212 and the reflective structures 213 can be fixed to the lower light source substrate 211 by the light source planarization layer 214.Furthermore, in the display device according to a further embodiment of the present disclosure, damage to the lower light source devices 212 and the reflective structures 213 due to external influences can be prevented. Therefore, in the display device according to a further embodiment of the present disclosure, defects due to movement and / or deformation of the lower light source devices 212 and the reflective structures 213 can be prevented or reduced. As shown in Fig. 13, in the display device according to a further embodiment of the present disclosure, the first viewing angle control unit 300 can have a structural planarization layer 340 that covers the first light-blocking structures 320. The structural planarization layer 340 can be a transparent material. The structural planarization layer 340 can be an adhesive material. For example, the structural planarization layer 340 can be attached to the lower surface of the control substrate 310 between the first light-blocking structures 320. Thus, in the display device according to a further embodiment of the present disclosure, the first light-blocking structures 320 can be fixed to the lower surface of the control substrate 310 by the structural planarization layer 340.Furthermore, in the display device according to a further embodiment of the present disclosure, damage to the lower optical film 231 and lower optical film 232 due to the first light-blocking structures 320 can be prevented or reduced. Therefore, in the display device according to a further embodiment of the present disclosure, the quality of the image provided to the user in the narrow viewing-angle mode can be improved. The display device according to the embodiment of the present disclosure is described such that the first viewing angle control unit 300, comprising the first light-blocking structures 320 and the optical lenses 330, is arranged between the lower optical film 231 and lower optical film 232 and the upper light guide plate 250, and the second viewing angle control unit 400, comprising the second light-blocking structures 430, which are surrounded by the structure-insulating layer 440, is arranged between the upper optical film 271 and upper optical film 272 and the display panel 100. However, in the display device according to a further embodiment of the present disclosure, the first viewing angle control unit 300 and the second viewing angle control unit 400 can be arranged in different ways.For example, in the display device according to a further embodiment of the present disclosure, the second viewing angle control unit 400 can be arranged between the lower optical film 231 and lower optical film 232 and the upper light guide plate 250, and the first viewing angle control unit 300 can be arranged between the upper optical film 271 and upper optical film 272 and the display panel 100, as shown in Fig. 14. Thus, in the display device according to a further embodiment of the present disclosure, at least a portion of the light reflected from a lower surface of the display panel 100 towards the upper light guide plate 250 can be trapped in the wide-viewing-angle mode between the reflective layer 321 and the thin metal layer 323 of each first light-blocking structure 320.Furthermore, in the display device according to a further embodiment of the present disclosure, the reflection of the external light passing through the display panel 100 can be blocked by the first light-blocking structures 320. Therefore, in the display device according to a further embodiment of the present disclosure, the quality of the image provided to the user in the wide-viewing-angle mode can be improved. The display device according to the embodiment of the present disclosure is described such that the second viewing angle control unit 400 has the second light-blocking structures 430, which are surrounded by the structure-insulating layer 440. However, in the display device according to a further embodiment of the present disclosure, the second viewing angle control unit 400 can have different structures. For example, in the display device according to a further embodiment of the present disclosure, the second viewing angle control unit 600, which is arranged between the upper optical film 271 and the upper optical film 272 and the display panel 100, can have upper light-blocking structures 620 and upper optical lenses 630, which are supported by the upper control substrate 610, as shown in Fig. 15. The upper light-blocking structures 620 and the upper optical lenses 630 can extend in the first direction X. The upper light-blocking structures 620 can be spaced apart from each other in the second direction Y. Each of the upper optical lenses 630 has a region that is positioned between adjacent upper light-blocking structures 620 in the second direction Y. A surface of each upper optical lens 630 facing the display panel 100 can have a convex shape. For example, each of the upper optical lenses 630 can function as a convex lens. A structure of each upper light-blocking structure 620 can have the same structure as a structure of each first light-blocking structure 320.For example, each of the upper light-blocking structures 620 can have a stacked structure consisting of an upper reflective layer 621, an upper light-trap layer 622, and an upper thin metal layer 623. Thus, in the display device according to a further embodiment of the present disclosure, the quality of the image provided to the user in the narrow viewing-angle mode and the quality of the image provided to the user in the wide viewing-angle mode can be improved. In the display device according to a further embodiment of the present disclosure, the display panel 100 can be installed at various locations where the image of the wide-viewing-angle mode and the image of the narrow-viewing-angle mode are selectively realized. For example, in the display device according to a further embodiment of the present disclosure, the display panel 100 can be installed inside a car, as shown in Fig. 16. The image realized by the display panel 100 can be provided to a driver sitting in a driver's seat DS and / or a passenger sitting in a passenger seat PS. For example, the first direction X can be a direction between the driver's seat DS and the passenger seat PS. The display panel 100 can be arranged in front of the passenger seat PS. When the car is moving, the display panel 100 can display an image in narrow-angle viewing mode. Thus, in the display device according to a further embodiment of the present disclosure, when the car is moving, the image displayed by the display panel 100 cannot be seen by the driver sitting in the driver's seat DS. Furthermore, in the narrow-angle viewing mode of the display device according to a further embodiment of the present disclosure, the image displayed by the display panel 100 cannot be reflected by a front windshield FW, which is arranged in the second direction Y next to the display panel 100. Therefore, in the display device according to a further embodiment of the present disclosure, accidents caused by driver distraction can be prevented or reduced. As a result, the display device according to the embodiments of the present disclosure can have the display panel on the backlight unit and the viewing angle control unit on a path of light supplied by the backlight unit to the display panel, wherein the viewing angle control unit can have a stacked structure of the light-blocking structures and the optical lenses, wherein each of the light-blocking structures extending in the first direction can have a stacked structure of the reflective layer, the light-trap layer and the thin metal layer, wherein each of the optical lenses on the thin metal layer of each light-blocking structure can have a region that is arranged between the light-blocking structures that are arranged at a distance from each other in the second direction perpendicular to the first direction.and wherein the thin metal layer can have a smaller thickness than the reflective layer and the light-trap layer. Thus, in the display device according to the embodiments of the present disclosure, the light passing between the light-blocking structures can be focused by one of the optical lenses. In this way, the quality of the image realized by the display panel can be improved in the display device according to the embodiments of the present disclosure. Furthermore, low-power operation and reduced power consumption can be achieved in the display device according to the embodiments of the present disclosure.

Claims

A display device comprising: a backlight unit (200) comprising a first light guide plate (220); a first viewing angle control unit (300) comprising first light-blocking structures (320) arranged on the first light guide plate (220), spaced apart from each other in a first direction and extending perpendicular to the first direction in a second direction;and a display panel (100) on the first viewing angle control unit (300), wherein each of the first light-blocking structures (320) comprises a reflective layer (321), a thin metal layer (323) arranged on the reflective layer (321), and a light-trap layer (322) arranged between the reflective layer (321) and the thin metal layer (323), and wherein the thin metal layer (323) arranged near the display panel (100) has a smaller thickness than the reflective layer (321) and the light-trap layer (322). The display device according to claim 1, wherein the first viewing angle control unit (300) further comprises first optical lenses (330) positioned on the first light-blocking structures (320), each of the first optical lenses (330) having a region located between the first light-blocking structures (320) which are spaced apart from each other in the first direction. The display device according to claim 2, wherein a lower surface of each of the first optical lenses (330) in the direction of the first light guide plate (220) has a larger size than each of the first light-blocking structures (320) and has a larger size than a space between the first light-blocking structures (320) in the first direction. The display device according to claim 2 or 3, wherein a length of a lower surface of each of the first optical lenses (330) in the first direction is equal to a distance of the first light-blocking structures (320) in the first direction. The display device according to one of claims 2 to 4, wherein a section of each of the first optical lenses (330) between the first light-blocking structures (320) has a constant shape. The display device according to one of claims 1 to 5, wherein the light trap layer (322) comprises a light-absorbing material and the thin metal layer (323) is a light-transmitting layer. The display device according to any one of claims 1 to 6, wherein the light trap layer (322) comprises a metal oxide, and wherein the light trap layer (322) comprises a metal that is different from the thin metal layer (323). The display device according to claim 7, wherein the light trap layer (322) comprises an oxide of a metal material contained in the thin metal layer (323). The display device according to any one of claims 1 to 8, wherein the reflective layer (321) has the same material as the thin metal layer (323). The display device according to any one of claims 1 to 9, wherein the reflective layer (321) has a greater thickness than the light-trap layer (322). The display device according to one of claims 1 to 10, further comprising a second viewing angle control unit (400, 600) above or below the first viewing angle control unit (300), wherein the backlight unit (200) further comprises a second light guide plate (250) arranged below the second viewing angle control unit (400, 600), and wherein the second viewing angle control unit (400) comprises second light-blocking structures (430, 620) extending parallel in the first direction. The display device according to claim 11, wherein the second viewing angle control unit (600) has second optical lenses (630) arranged on the second light-blocking structures (620), wherein each of the second optical lenses (630) has a region located between the second light-blocking structures (620) which are spaced apart in the second direction, and wherein each of the second light-blocking structures (620) has the same stacked structure as each of the first light-blocking structures (320). The display device according to one of claims 1 to 12, wherein the light-trap layer (322) of each of the first light-blocking structures (320) is in direct contact with the reflective layer (321) and the thin metal layer (323) or is arranged at a distance of at least one from the reflective layer (321) and the thin metal layer (323). The display device according to one of claims 1 to 13, wherein side surfaces of the first light-blocking structures (320) have an uneven shape in the second direction. A display device comprising: a backlight unit (200) comprising a first optical film (230); a first viewing angle control unit (300) comprising first light-blocking structures (320), a control substrate (310), and optical lenses (330) stacked sequentially on the first optical film (230); and a display panel (100) on the optical lenses (330) of the first viewing angle control unit (300), wherein the first light-blocking structures (320) arranged on a first surface of the control substrate (310) in the direction of the first optical film extend parallel in a first direction, wherein each of the optical lenses (330) arranged on a second surface of the control substrate (310) in the direction of the display panel (100) has a region extending between the first light-blocking structures (320),which are arranged in a second direction perpendicular to the first direction at a distance from each other, and wherein each of the first light-blocking structures (320) has a structure in which a thin metal layer (323), a light-trap layer (322) having a greater thickness than the thin metal layer (323), and a reflective layer (321) having a greater thickness than the light-trap layer (322) are stacked successively on the first surface of the control substrate (310). The display device according to claim 15, wherein the light trap layer (322) is made of an oxide of a metal material contained in the thin metal layer (323). The display device according to claim 15 or 16, further comprising a second viewing angle control unit (400) between the first viewing angle control unit (300) and the display panel (100), wherein the backlight unit (200) comprises: a light guide plate (250) between the first viewing angle control unit (300) and the second viewing angle control unit (400), a second optical film (270) between the light guide plate (250) and the second viewing angle control unit (400), and upper light source devices (262) arranged side by side on a side surface of the light guide plate (250), wherein the second viewing angle control unit (400) comprises second light-blocking structures (430) extending in the second direction, and wherein a structure of each second light-blocking structure (430) is different from a structure of each first light-blocking structure (320). The display device according to one of claims 15 to 17, wherein the backlight unit (200) has lower light source devices (212) arranged side by side on an upper surface of a light source substrate (211), and wherein the first optical film (230), the first viewing angle control unit (300) and the display panel (100), which are stacked on the lower light source devices (212), are arranged parallel to the light source substrate (211). A vehicle comprising the display device according to any one of claims 1 to 18. The vehicle according to claim 19, wherein the display device is arranged in front of a passenger seat (PS), the first direction is a direction between a driver's seat (DS) and the passenger seat (PS), and a front windshield (FW) is arranged in the second direction next to the display device.

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