DISPLAY DEVICE

Abstract

According to an embodiment of the present application, a display device is provided comprising several first light sources, a diffuser plate on the first light sources, a prism plate on the diffuser plate, a thin light control layer on the prism plate, a light guide plate on the thin light control layer having a longer side extending in a first direction and a shorter side extending in a second direction intersecting the first direction, and comprising several second light sources arranged such that they face the longer side of the light guide plate, wherein the several second light sources are arranged repeatedly in the first direction and are each controlled independently.

Description

The present application claims priority over Korean patent application No. 10-2025-0024780, filed on February 26, 2025. TECHNICAL AREA The present application text relates to a display device. TECHNICAL BACKGROUND As the information society develops, various demands for display devices for showing images increase, and different types of display devices are used, such as a liquid crystal display device (LCD device) and an organic light-emitting diode display device (OLED display device). Conventional display devices do not restrict the viewing angle. However, recently, restrictions on the viewing angle have become increasingly necessary for privacy and information protection reasons. For example, a display device used as an in-vehicle information medium may provide high-quality images for a passenger in a front seat, but it is necessary to restrict the viewing angle for a driver for reasons of driving safety. SUMMARY OF THE INVENTION One object of the present invention is to provide a display device that can display different images according to a viewing angle. Another object of the present invention is to provide a display device in which a surface with a limited viewing angle can be changed. Another object of the present invention is to provide a display device in which the comfort of a user can be improved by changing the area with a limited viewing angle. The tasks of the present application are not limited to those described above, and further technical tasks can be derived from the following embodiments. At least one of these problems is solved by the features of the independent claims. Further embodiments are defined by the respective dependent claims, in the detailed description, and the accompanying drawings. According to one aspect of the present invention, a display device is provided comprising several first light sources, a diffuser plate arranged on the first light sources, a prism plate arranged on the diffuser plate, a thin light control layer arranged on the prism plate, a light guide plate arranged on the thin light control layer and having a longer side extending in a first direction and a shorter side extending in a second direction intersecting the first direction, and several second light sources arranged such that they face the longer side of the light guide plate, wherein the several second light sources are arranged repeatedly in the first direction and are each controlled independently. According to a further aspect of the present invention, a display device is provided comprising a first display surface operating in a shared-use mode with a wide viewing angle, a second display surface arranged on one side of the first display surface in a first direction and switching between the shared-use mode with the wide viewing angle and a private mode with a narrow viewing angle, a boundary between the first display surface and the second display surface extending in a second direction intersecting the first direction, several first light sources arranged over the first display surface and the second display surface, a light guide plate arranged on the first light sources, and several second light sources arranged in such a manner as tothat they are facing a side surface of the light guide plate and are arranged repeatedly in the first direction, wherein the boundary between the first display area and the second display area can move in the first direction according to the on and off states of the multiple second light sources. The display device according to any aspect of the present invention may include one or more of the following features: The light guide plate can have a rectangular shape. The longer side of the light guide plate defines its length. The shorter side of the light guide plate defines its width. The display device can include a first display area that operates in a shared-use mode with a wide viewing angle. The display device can include a second display area that switches between the shared-use mode with the wide viewing angle and a private mode with a narrow viewing angle. That is, the second display area can be configured to switch between the shared-use mode with the wide viewing angle and a private mode with a narrow viewing angle. The terms "wide viewing angle" and "narrow viewing angle" can be interrelated; that is, a wide viewing angle can refer to a viewing angle that is wider than a narrow viewing angle, and vice versa. A range of viewing angles that are to be understood as wide viewing angles can be distinct from a range of viewing angles that are to be understood as narrow viewing angles. The first display area and the second display area can be arranged in the first direction. When the second display area is operating in shared mode, at least one or some of the secondary light sources corresponding to the second display area can be switched on. When the second display area is operating in private mode, at least one or some of the secondary light sources corresponding to the second display area can be switched off. A boundary between the first and second display areas can extend in the second direction. This boundary can be variable in the first direction by switching the multiple secondary light sources on and off. The display device can be configured to vary the boundary between the first and second display areas by switching on and / or off some, i.e., a variable portion or sub-area, of the multiple secondary light sources. Switching on a secondary light source can also refer to supplying power to the second light source to produce light. The optical fiber board can contain multiple optical fiber patterns on a back surface facing the thin light control layer. The density per unit area of ​​the multiple optical fiber patterns can increase, particularly when the optical fiber patterns are located further away from the multiple secondary light sources in the second direction. The multiple secondary light sources can be arranged on either side or the far side of the optical fiber in the second direction. The multiple secondary light sources can be arranged at both ends of the optical fiber in the second direction. The multiple secondary light sources can be arranged on each longer side of the optical fiber. The multiple secondary light sources can be arranged on each side of the optical fiber that runs in the first direction. The density per unit area of ​​the multiple optical fiber patterns increases from the longer side of the optical fiber to a central section of the optical fiber in the second direction. The multiple optical fiber patterns can have a pyramidal shape projecting towards the thin optical control layer. Each of the multiple optical fiber patterns can have a pyramidal shape projecting towards the thin optical control layer. The inclinations of the four lateral surfaces forming the pyramidal shape can all be the same. The pyramidal shape can be regular. The lateral faces of the pyramidal shape can be congruent. The thin light-control layer can contain multiple light-shielding patterns and optionally patterned thin insulating layers between the light-shielding patterns. The multiple light-shielding patterns can run in the second direction. The multiple light-shielding patterns can be repeated in the first direction. The multiple light-shielding patterns can have the same thickness in one direction. The multiple light-shielding patterns can be arranged repeatedly at regular intervals in that direction. The prism plate can contain a first prism plate and a second prism plate. The first prism plate and the second prism plate can be stacked sequentially. A prism pattern of the first prism plate and a prism pattern of the second prism plate can have axes that are orthogonal to each other. The display device can include a display panel on the optical fiber board. The geometric dimensions of the display panel can be aligned with one of the optical fiber boards. The optical fiber board and the display panel can be congruent with each other. That is, the display panel can have a longer side and a shorter side. The display panel can include a lower substrate, an upper substrate, and a liquid crystal layer between the lower and upper substrates. The first several light sources can be arranged below the diffuser plate. The multiple secondary light sources can be arranged on only one side and the other side of the light guide plate in the second direction. The multiple secondary light sources can be arranged at only one end of the light guide plate in the second direction. The multiple secondary light sources can be arranged along the longer side of the light guide plate. The optical fiber board can contain multiple optical fiber patterns on a back surface facing the thin light control layer. The density per unit area of ​​the multiple optical fiber patterns can increase as the optical fiber patterns are located further away from multiple secondary light sources. When the first display area is operating in shared use mode, the remaining of the multiple second light sources corresponding to the first display area can be switched on. According to the embodiments of the present application text, different images can be provided depending on the viewing angle. According to the embodiments of the present application text, the area with a limited viewing angle can be changed. According to the embodiment of the present application text, the user's comfort can be improved due to the change in the area with a limited viewing angle. According to the embodiment of the present application, the area with a limited viewing angle can be modified according to the user's requirements, thereby increasing the efficiency of the display device and further simplifying the process. Accordingly, power consumption can be reduced, thus lowering production energy consumption. However, the effects that can be achieved from the present application text are not limited to the effects described above, and further effects not described can be clearly understood by relevant experts in the field of the present application text on the basis of the following description. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a top view of a display device according to one embodiment. Fig. 2 is a perspective exploded view of the display device according to one embodiment. Fig. 3 is a cross-sectional view along line AA' in Fig. 1. Fig. 4 is a schematic view showing a second light guide plate and its circumferential cross-sectional structure according to one embodiment. Fig. 5 is a schematic view showing a light guide pattern of a second light guide plate according to one embodiment. Fig. 6 is a graph showing the density of the light guide pattern in a second direction according to one embodiment. Fig. 7 is a schematic view of the display device in which both a first display area and a second display area operate in a shared-use mode.Figure 8 is a schematic view of the display device, in which the first display area operates in shared-use mode and the second display area operates in a private mode. Figure 9 is a perspective exploded view of a display device according to a further embodiment. Figure 10 is a schematic view showing a second light guide plate and its circumferential cross-sectional structure according to a further embodiment. Figure 11 is a top view of the display device according to a further embodiment. Figure 12 is a perspective exploded view of the display device according to a further embodiment. DETAILED DESCRIPTION OF THE INVENTION The following descriptions illustrate embodiments with reference to the accompanying drawings. When the application text describes a particular component (or area, layer, section, etc.) as "on", "connected" to, or "coupled to" another component, this means that the particular component may be directly connected to / coupled to another component, or that yet another component may be arranged between them. The same reference symbols denote the same components. Additionally, in the drawings, thicknesses, proportions, and dimensions of components are exaggerated for the effective description of technical content. The expression "and / or" encompasses all one or more combinations that can be defined by the associated configurations. Terms such as "first" and "second" can be used to describe different components; however, the components are not limited by these terms. The terms are used merely to distinguish one component from another. For example, a first component can be referred to as a second component, and conversely, the second component can also be referred to as the first component. The singular includes the plural unless the context clearly indicates otherwise. Terms such as "under," "on a bottom," "above," and "on a top" are used to describe the relationship between the components illustrated in the drawings. These terms are relative concepts and are described in terms of directions marked in the drawings. It is to be understood that a term such as "contains" or "has" is intended to specify the presence of features, counts, steps, operations, components, parts or a combination thereof described in the application text, and does not exclude in advance the presence or possibility of adding one or more further features, counts, steps, operations, components, parts or combinations thereof. Fig. 1 is a top view of a display device according to one embodiment. Referring to Fig. 1, a display device 1 can include, but is not limited to, both a display function for showing an image and a touch detection function for detecting a user's touch. For example, the display device 1 can include only one of the display function for showing an image and one of the touch detection function for detecting a user's touch. The display device 1 can be an electroluminescent display device or a micro light-emitting diode display device containing a touch sensor. Alternatively, the electroluminescent display device containing a touch sensor can be an organic light-emitting diode (OLED) display device, a quantum dot light-emitting diode display device, or an inorganic light-emitting diode display device. The display device 1 according to the present embodiment can be a vehicle display device, but is not limited to this. For example, the description of the display device 1 can be applied without restriction to the type of device, as long as a display device is a device that includes a display device function. The display device 1 can have a length extending in a first direction DR1 and a width extending in a second direction DR2. The first direction DR1 and the second direction DR2 can intersect or be perpendicular to each other, but are not limited to this. The display device 1 can have a longer side extending in the first direction DR1 and a shorter side extending in the second direction DR2. If the display device 1 according to the present embodiment is a vehicle display device, the display device 1 may include a function of manipulating at least some different functions of a vehicle, a function of displaying various information about the vehicle, etc. If the display device 1, according to the present embodiment, is a vehicle display device, the display device 1 can be arranged on a vehicle's dashboard. The display device 1 can be arranged above a driver's seat and a front passenger seat located at the front of a vehicle, but is not limited to this. One direction in which the display device 1 is arranged to cross the driver's seat and the front passenger seat can correspond to the first direction DR1. That is, the display device 1 can run in the first direction DR1 and can be arranged in the first direction DR1 above the driver's seat and the front passenger seat. If the display device 1 is a vehicle display device, both a driver sitting in the driver's seat and a passenger sitting in the front passenger seat can use the display device 1. The display device 1 can provide the same image to both the driver sitting in the driver's seat and the front passenger sitting in the front passenger seat, or it can provide different images to each. The display device 1 can contain a display area DA and a non-display area NDA. The display area DA can be an area on which a screen can be displayed. Light can be emitted outwards from the display area DA. The display area DA can also include a touch detection function. In this case, the display area DA can correspond to a touch detection surface, but is not limited to this. The surface shape of the display area DA can correspond to, but is not limited to, the surface shape of the display device 1. The display area DA can have a longer side extending in the first direction DR1 and a shorter side extending in the second direction DR2. The display area DA can contain a first display area DA1 and a second display area DA2. The first display area DA1 and the second display area DA2 can be arranged continuously in the first direction DR1. That is, the second display area DA2 can be arranged on one side of the first display area DA1 in the first direction DR1, and the first display area DA1 can be arranged on the far side of the second display area DA2 in the first direction DR1. The first display area DA1 can operate in a first mode, and the second display area DA2 can operate in both the first mode and a second mode. For example, the first mode can be a shared mode that does not restrict the lateral viewing angle of display device 1. The second mode can be a private mode that restricts the lateral viewing angle of display device 1. That is, the shared mode can have a wide viewing angle and the private mode can have a narrow viewing angle. Here, the lateral viewing angle can be a lateral viewing angle in the first direction DR1. The first display area, DA1, can maintain shared mode while display device 1 is operating. The second display area, DA2, can selectively operate in shared mode or private mode while display device 1 is operating. During operation of display device 1, the second display area, DA2, can switch between shared and private modes. When the display device 1 is applied to a vehicle display device, the first display area DA1 can be located near the driver's seat and the second display area DA2 can be located near the front passenger seat. When both the first display area DA1 and the second display area DA2 are operating in shared use mode, images, videos, and the like displayed in the first display area DA1 and images, videos, and the like displayed in the second display area DA2 can be made available to both the driver sitting in the driver's seat and the front passenger sitting in the front passenger seat. When the second display area DA2 is operating in private mode, the images, videos, and the like displayed in the second display area DA2 can be made available to the front passenger sitting in the front passenger seat and need not be made available to the driver sitting in the driver's seat. The second display surface DA2 of the display device 1 according to the present embodiment can have a variable size. For example, a boundary BD between the first display surface DA1 and the second display surface DA2 can be moved to one side and to the other in the first direction DR1. This can provide improved user comfort for the display device 1. Furthermore, the efficiency of the display device 1 can be improved, and the manufacturing process of the display device 1 can be simplified, thereby reducing power consumption and production energy. The non-display area (NDA) can be an area in which no screen is displayed. Light need not be emitted outwards from the non-display area (NDA), but there is no restriction in this regard. The non-display area (NDA) can be arranged around the display area (DA). The non-display area (NDA) can surround the display area (DA), but the embodiments described in this application are not limited to this. A border area of ​​the display device 1 can be defined by the non-display area (NDA), but the embodiments described in this application are not limited to this. Fig. 2 is a perspective exploded view of the display device according to one embodiment. Fig. 3 is a cross-sectional view along line AA' in Fig. 1. Referring to Figs. 1, 2 to 3, the display device 1, according to one embodiment, can include a display panel 110 containing pixels and displaying images, and a first and a second backlighting unit 120 and 130, which are arranged on a rear surface of the display panel 110 and emit light towards a front surface of the display panel 110. Although not shown, the display device 1 can further include a panel guide, an upper housing, a bottom cover, and the like, which securely mount the display panel 110 and the first and second backlighting units 120 and 130. The display panel 110 can be a liquid crystal panel and can include a lower substrate and an upper substrate connected in such a way that they face each other, and a liquid crystal layer arranged between the substrates. The lower substrate can contain gate lines and data lines arranged to intersect each other, and liquid crystal cells formed at the intersections of the gate lines and data lines. The liquid crystal cells can contain thin-film transistors located at the intersections of the gate lines and data lines, and a pixel electrode that receives a data voltage applied to the data line via the thin-film transistor when the thin-film transistor is switched on. On the upper substrate are arranged color filters for implementing multiple colors by absorbing red, green and blue, a black matrix for dividing the color filters and blocking light passing through the liquid crystal layer, and a common electrode for applying a voltage to the liquid crystal layer. The liquid crystal cells are controlled by an electric field generated by a potential difference between data voltages supplied to the pixel electrodes via the data lines and a common voltage supplied to the common electrode, thereby controlling the amount of light passing through the display panel 110. The first and second backlighting units 120 and 130 are arranged below the display panel 110 and provide light for the display panel 110. The first backlighting unit 120 can be arranged below the display panel 110, and the second backlighting unit 130 can be arranged between the first backlighting unit 120 and the display panel 110. The first backlighting unit 120 can include a first light source assembly 121, a first light guide plate 122, a diffuser plate 123, a prism plate 124 and a thin light control layer 125. The surface shape of the first light guide plate 122, the diffuser plate 123, the prism plate 124, and the thin light control layer 125 can correspond to the surface shape of the display device 1. That is, the first light guide plate 122, the diffuser plate 123, the prism plate 124, and the thin light control layer 125 can have longer sides extending in the first direction DR1 and shorter sides extending in the second direction DR2. The first light source assembly 121 can contain a first light source LS1 and a first light source substrate BS1. The first light source LS1 can be provided as multiple first light sources, and the multiple first light sources LS1 can be mounted on the first light source substrate BS1. The multiple first light sources LS1 can be arranged repeatedly in the first direction DR1 and the second direction DR2 on the first light source substrate BS1. The multiple first light sources LS1 can be driven by the first light source substrate BS1 absorbing power and can produce light. Although not limited to this, the first light source LS1 can produce light using various light sources such as a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), a hot cathode fluorescent lamp (HCFL), a light-emitting diode (LED), etc. The first light source substrate BS1 can provide a space in which the first light source LS1 can be located. The first light source substrate BS1 can have a printed circuit board mounted on it for operating the first light source LS1. The first light source substrate BS1 can control the first light source LS1 according to electrical signals supplied via wiring to the printed circuit board, thereby enabling the first light source LS1 to emit light. The first light source assembly 121 can be arranged below the first light guide plate 122. Accordingly, light emitted by the first light source assembly 121 can fall on a lower surface of the first light guide plate 122. However, the arrangement of the first light source assembly 121 is not limited to this. For example, the first light source assembly 121 can be arranged on a side surface of the first light guide plate 122. That is, the first light source assembly 121 and the first light source LS1 can be arranged such that they face a side surface of the first light guide plate 122. Accordingly, the light emitted by the first light source assembly 121 can fall on a side surface of the first light guide plate 122 and be emitted to a top surface of the first light guide plate 122. The display device 1 may further include a light source protection layer PT. The light source protection layer PT may be arranged on the first light source assembly 121 and may be arranged such that it covers the first light source LS1. The light source protection layer PT can protect the first light sources LS1. The light source protection layer PT may be formed from a resin, but is not limited to this. The first light guide plate 122 can be arranged on the first light source assembly 121. The first light guide plate 122 is arranged such that it faces the first light source assembly 121 and guides the light incident from the first light source assembly 121 in such a way that it is emitted upwards. In one embodiment, the first light guide plate 122 can be made of a translucent material, e.g., a plastic material such as polymethyl methacrylate (PMMA) or a material selected from polycarbonate-based materials (PC-based materials). However, the material of the first light guide plate 122 is not limited to the materials described above, and the first light guide plate 122 can be made of other materials. The diffuser plate 123 can be arranged on the first light guide plate 122. The diffuser plate 123 diffuses the light emitted by the first light guide plate 122, thereby improving the uniformity of brightness across the viewing angle. The diffuser plate 123 can be made of a PET or PC resin and can include a particle coating layer that acts as a diffuser. The prism plate 124 can be arranged on the diffuser plate 123. The prism plate 124 collects the light emitted from the first light guide plate 122 or the diffuser plate 123 such that one direction of propagation of light is close to a normal direction of the display panel 110, thereby improving the front brightness of the display panel 110. The prism plate 124 can contain a first prism plate 124a and a second prism plate 124b. Each of the first prism plate 124a and the second prism plate 124b can contain a prism pattern. A prism pattern of the first prism plate 124a and a prism pattern of the second prism plate 124b can have axes that are orthogonal to each other. Since the second light source assembly 131 is arranged on one side and the other side of a second light guide plate 132 in the second direction DR2, and the prism plate 124 contains the first prism plate 124a and the second prism plate 124b, the brightness of the display device 1 can be improved. A thin light control layer (LCF) 125 can be arranged on the prism plate 124. The thin light control layer 125 can control a light emission profile of the first backlighting unit 120. For example, the thin light control layer 125 can adjust the viewing angle of the light emitted by the first backlighting unit 120 to narrow viewing angles in a left / right direction (a first direction DR1) and / or a vertical direction (a second direction DR2). The thin light-control layer 125 can contain multiple light-shielding patterns BP and patterned thin insulating layers IL that fill spaces between the light-shielding patterns BP. Although not shown, the thin light-control layer 125 can further comprise a lower substrate and an upper substrate, with the light-shielding patterns BP and the patterned thin insulating layers IL arranged between them. The light-shielding patterns BP can contain a black dye such as carbon black. The light-shielding patterns BP can have a predetermined thickness in one direction (a third direction DR3) and be parallel to the second direction DR2. The light-shielding pattern BP can be provided as multiple light-shielding patterns and arranged repeatedly in the first direction DR1. The distance between adjacent light-shielding patterns BP can be constant across the display area DA, but is not limited to this. The multiple light-shielding patterns BP can all have the same thickness, but are not limited to this. For example, the distance between adjacent light-shielding patterns BP and the thickness of the multiple light-shielding patterns BP across the first display area DA1 and the second display area DA2 can be the same, but are not limited to this. Accordingly, if the distance between adjacent light-shielding patterns BP is constant across the entire area and the multiple light-shielding patterns BP all have the same thickness, the thin light-control layer 125 can more easily restrict the emission angle of the light emitted by the first light source assembly 121, such that the direction of propagation can be set to form a narrow angle. Furthermore, in this case, a more uniform amount of light can be provided across the entire display area DA, thereby improving the clarity across the entire display area DA. The propagation path of light passing through the thin light-control layer 125 can be restricted by the light-shielding pattern BP. The thin light-control layer 125 can adjust the transmittance of the light emitted by the first light source assembly 121 and deflect the light, thereby improving the contrast and clarity of images, videos, and the like displayed on the display area DA. Furthermore, the thin light control layer 125 can limit the emission angle of the light emitted by the first light source assembly 121 using the light shielding pattern BP. The propagation path of the light passing through the thin light-control layer 125 can be restricted by the light-shielding pattern BP. Using the light-shielding pattern BP, the thin light-control layer 125 can suppress or prevent the light emitted by the first light source assembly 121 from propagating to one side or to the other side in the first direction DR1. Under the light emitted by the first light source assembly 121, light propagating in the third direction DR3 and spreading to one side or the far side in the first direction DR1 can be blocked by the thin light control layer 125. Accordingly, the direction of propagation of the light emitted by the first light source assembly 121 and passing through the thin light control layer 125 has a narrow angle. Accordingly, a large portion of the light emitted by the first light source assembly 121 in the first display area DA1 can propagate towards the driver, and a large portion of the light need not be perceived by the front passenger. Similarly, a large portion of the light emitted by the first light source assembly 121 in the second display area DA2 can propagate towards the front passenger, and a large portion of the light need not be perceived by the driver. The second backlighting unit 130 can be arranged on top of the first backlighting unit 120. The second backlighting unit 130 can include a second light source assembly 131 and a second light guide plate 132. The second light guide plate 132 can be arranged on the thin light control layer 125. The second light guide plate 132 guides light emitted by the second light source assembly 131 and directs the light upwards. The light emitted by the second light source assembly 131 can be incident on side surfaces of the second light guide plate 132. The surface shape of the second light guide plate 132 can correspond to the surface shape of the display device 1. That is, the second light guide plate 132 can have a longer side extending in the first direction DR1 and a shorter side extending in the second direction DR2. The second optical fiber plate 132 can be made of essentially the same material as the first optical fiber plate 122, but is not limited to this. The second light source assembly 131 can be arranged on the side surfaces of the second light guide plate 132. The second light source assembly 131 can be arranged such that it faces (or is opposite) the longer side of the second light guide plate 132. The second light source assembly 131 can extend in the first direction DR1. The second light source assembly 131 can be arranged on either side or the far side of the second light guide plate 132 in the second direction DR2, but is not limited to this. That is, the second light guide plate 132 can be arranged between the second light source assemblies 131. The second light source assemblies 131 can be arranged facing each other, with the second light guide plate 132 positioned between them. The second light source assembly 131 can contain a second light source LS2 and a second light source substrate BS2. The second light source substrate BS2 can extend in the first direction DR1. The second light source LS2 can be provided as multiple second light sources, and the multiple second light sources LS2 can be mounted on the second light source substrate BS2. The multiple second light sources LS2 can be arranged on the second light source substrate BS2 and can be repeated in the first direction DR1. For the sake of simplicity, Fig. 2 shows only four second light sources LS2 arranged on the second light source substrate BS2, but the embodiments of the present application are not limited to this and four or more second light sources LS2 may be provided. Since the multiple second light sources LS2 are arranged repeatedly in the first direction DR1, the viewing angle in the first direction DR1 can be improved in shared use mode. The multiple secondary light sources LS2 can be driven by drawing power via the secondary light source substrate BS2 and can produce light. Although not limited to this, the secondary light source LS2 can produce light using various light sources such as a CCFL, an EEFL, an HCFL, an LED, etc. The multiple secondary light sources LS2 can each be controlled independently. Accordingly, the first display area DA1 and the second display area DA2 can be modified. The second light source substrate BS2 can provide a space in which the second light source LS2 can be located. The second light source substrate BS2 can have a printed circuit board mounted to it for operating the second light source LS2. The second light source substrate BS2 can control the second light source LS2 according to electrical signals supplied via wiring to the printed circuit board, thereby enabling the second light source LS2 to emit light. The second light guide plate 132 can refract incident light emitted by the second light source assembly 131 not only in the second direction DR2, but also in the first direction DR1, thereby implementing the mode for joint use of the display device 1. Fig. 4 is a schematic view showing a second optical fiber plate and its circumferential cross-sectional structure according to one embodiment. Fig. 5 is a schematic view showing an optical fiber pattern of a second optical fiber plate according to one embodiment. Fig. 6 is a graph showing the density of the optical fiber pattern in a second direction according to one embodiment. In Fig. 6, a horizontal axis (an X-axis) represents the location of the second optical fiber plate 132 in the second direction DR2, and a vertical axis (a Y-axis) represents the density per unit area of ​​the optical fiber pattern 132a. That is, the vertical axis (the Y-axis) represents the location from one side of the second optical fiber plate 132 in the second direction DR2 to the other side in the second direction DR2. The higher the density per unit area of ​​the optical fiber pattern 132a, the more optical fiber patterns 132a can be arranged per unit area. Furthermore, with reference to Figs. 4, 5 to 6, polygonal projecting light guide patterns 132a can be formed on the back surface of the second light guide plate 132. The light guide patterns 132a can be embossed on the back surface of the second light guide plate 132 by injection molding or printing. In another embodiment, the light guide patterns 132a can be formed such that they are recessed in the back surface of the second light guide plate 132. In one embodiment, the light guide patterns 132a can have a pyramidal shape. In this case, the light guide patterns 132a can have a symmetrical shape in which the inclinations of all four side surfaces forming a pyramid are equal or substantially similar. Accordingly, since the light emitted by the second light source assemblies 131, which are arranged on one side and the far side of the second light guide plate 132 in the second direction DR2, can be refracted or dispersed uniformly to the one side and the far side in the first direction DR1, a section of the display area DA corresponding to an area where the second light source LS2 is switched on operates more easily in shared-use mode. In one embodiment, the length L of a side of the symmetrical pyramid can be in the range of approximately 10 to approximately 50 µm, e.g., approximately 30 µm. Additionally, in one embodiment, an angle a between the back surface of the second optical fiber plate 132 and a side surface of the symmetrical pyramid can be in the range of approximately 20° to approximately 60°, e.g., approximately 40°. An angle c between the back surface of the second optical fiber plate 132 and another side surface of the symmetrical pyramid can be in the range of approximately 20° to approximately 60°, e.g., approximately 40°. A vertex angle b of the symmetrical pyramid can be approximately 100°. The angle a between the back surface of the second optical fiber plate 132 and one side surface of the symmetrical pyramid and the angle c between the back surface of the second optical fiber plate 132 and the other side surface of the symmetrical pyramid can be equal, but are not limited to being equal. The height h1 of the symmetrical pyramid can be determined depending on the size and inclinations of four face surfaces and can, for example, be in the range of 5 µm to 30 µm. However, the present embodiment is not limited to this. The optical fiber patterns 132a can be arranged such that they are regularly or irregularly spaced apart. The density per unit area of ​​the optical fiber pattern 132a can vary depending on the location of the second optical fiber plate 132. The density per unit area of ​​the optical fiber pattern 132a can vary in the second direction DR2. As shown in Fig. 6, the density per unit area of ​​the light guide pattern 132a on the second light guide plate 132 can decrease when the light guide patterns 132a are near the second light source assembly 131, and can increase when the light guide patterns 132a are farther away from the second light source assembly 131. Since the second light source assemblies 131 are arranged on one side and the far side of the second light guide plate 132 in the second direction DR2, the density per unit area of ​​the light guide pattern 132a on the second light guide plate 132 can increase near a central section of the second light guide plate 132 (or a central section of the multiple light guide patterns 132a) in the second direction DR2 and decrease from the central section of the light guide plate 132 to the one side and the far side in the second direction DR2. Since the density per unit area of ​​the optical fiber pattern 132a increases as the optical fiber patterns 132a are located further away from the second light source assembly 131, even if the amount of light reaching an area located far from the second light source assembly 131 is insufficient, a percentage of light that is refracted or dispersed by multiple optical fiber patterns 132a in the first direction DR1 can increase. Accordingly, light passing through the second light guide plate 132 can be more uniform across the entire display area DA. Furthermore, the uniformity of the luminance can be improved depending on the viewing angle of the display device 1. The density per unit area of ​​the optical fiber pattern 132a on the second optical fiber plate 132 can be the same in the first direction DR1, but is not limited to it. The light incident on the second light guide plate 132 from the second light source assembly 131 can have an emission angle controlled by the light guide patterns 132a formed on the rear surface of the second light guide plate 132. Since the light guide pattern 132a is formed in a symmetrical pyramidal or point shape, the light emitted by the second light source assemblies 131, which are arranged on one side and the far side of the second light guide plate 132 in the second direction DR2, can be refracted at the four surfaces or curved surfaces of the light guide patterns 132a. Accordingly, the light emitted by the second light source assembly 131 can be refracted and emitted by the light guide patterns 132a not only in the second direction DR2, but also in the first direction DR1. The light emitted by the second light source assembly 131 can be refracted and emitted to one side and to the far side in the first direction DR1 as it passes through the second light guide plate 132, and the light emitted by the second light source assembly 131 can be emitted at a wide angle in the first direction DR1. This means that at least one section of the display area DA, which corresponds to the area in which the second light source LS2, which emits light (when switched on) from the second light source assembly 131, is located, can display images and videos in shared use mode. In the present application text, the expression “at least one section of the display area DA corresponding to the area in which the switched-on second light source LS2 is arranged” can refer to at least one section of the display area DA that is arranged on one or the other side of the switched-on second light source LS2 in the second direction DR2. Fig. 7 is a schematic view of the display device in which both a first display area and a second display area operate in a shared-use mode. Fig. 8 is a schematic view of the display device in which the first display area operates in shared-use mode and the second display area operates in a private mode. Furthermore, with reference to Figures 7 and 8, each of the multiple secondary light sources LS2 can be switched on and off independently. Accordingly, when at least some of the multiple secondary light sources LS2 are switched on, at least one section of the display area DA, corresponding to the area in which the switched-on secondary light source LS2 is located, can be switched to the shared-use mode. The light emitted by the first light source assembly 121 and passing through the thin light control layer 125 has a narrow viewing angle. Accordingly, when no light is emitted by the second light source assembly 131, both the first display area DA1 and the second display area DA2 operate in private mode. As shown in Fig. 7, when the second light sources LS2, which are arranged in the areas corresponding to the first display area DA1 and the second display area DA2, are switched on and emit light, the first display area DA1 and the second display area DA2 can emit both light L1 with a narrow viewing angle, emitted by the first light source assembly 121 and passing through the thin light control layer 125, and light L2 with a wide viewing angle in the first direction DR1, emitted by the second light source assembly 131 and passing through the second light guide plate 132. Accordingly, both the first display area DA1 and the second display area DA2 operate in shared use mode. As shown in Fig. 8, some of the second light sources LS2, which are arranged in the area corresponding to the first display area DA1, can be switched on to emit light, and the remaining second light sources LS2, which are arranged in the area corresponding to the second display area DA2, can be switched off to not emit light. In this case, the first display surface DA1 can emit both the light L1 with a narrow viewing angle, emitted by the first light source assembly 121 and passing through the thin light control layer 125, and the light L2 with a wide viewing angle, emitted by the second light source assembly 131 and passing through the second light guide plate 132 in the first direction DR1. The second display surface DA2 can only emit the light L1 with a narrow viewing angle, emitted through the thin light control layer 125 and passing through the second light guide plate 132. Accordingly, the first display area DA1 operates in shared mode and the second display area DA2 operates in private mode. Consequently, each of the multiple secondary light sources LS2 can be operated independently, and the first display area DA1 and the second display area DA2 can be switched between shared and private modes by turning the secondary light sources LS2 on and off. Furthermore, by adjusting the number and arrangement of the switched-on secondary light sources LS2, the boundary BD between the first display area DA1 and the second display area DA2 in the first direction DR1 can be adjusted. If the first display area DA1 operates only in shared use mode, the first light sources LS1 and the second light sources LS2, which are arranged in the area corresponding to the first display area DA1, can be kept in the switched-on state. Here, the first light sources LS1, which are arranged in the area corresponding to the first display area DA1, can be the first light sources LS1 that are arranged in the first display area DA1 in the third direction DR3. The second light sources LS2, which are arranged in the area corresponding to the first display area DA1, can be the second light sources LS2 that are arranged on one side and the far side of the first display area DA1 in the second direction DR2. If the second display area DA2 operates in both shared and private modes, the first light sources LS1, located within the area corresponding to the second display area DA2, can be kept in the on state, and the second light sources LS2, also located within the area corresponding to the second display area DA2, can be switched between the on and off states. Accordingly, depending on the arrangement of the second light sources LS2, whose on and off states are being switched, the arrangement of the second display area DA2 can vary, and the boundary BD between the first display area DA1 and the second display area DA2 can also vary. Here, the first light sources LS1, which are arranged in the area corresponding to the second display area DA2, can be the first light sources LS1, which are arranged in the second display area DA2 in the third direction DR3. The second light sources LS2, which are arranged in the area corresponding to the second display area DA2, can be the second light sources LS2, which are arranged on one side and the far side of the second display area DA2 in the second direction DR2. However, the embodiments of the present application text are not limited thereto and the display area DA can be formed from the second display area DA2, wherein the shared use mode and the private mode can be switched in all areas. Since the display device 1 contains both the first display area DA1 and the second display area DA2, the driver and the front passenger can receive different images depending on their viewing angle. Furthermore, because the second light source assembly 131 is located on one side and on the far side of the second light guide plate 132 in the second direction DR2, the second display area DA2 can be varied in different ways, thus improving user comfort. In addition, unnecessary manufacturing processes can be simplified, thereby reducing production energy. Further embodiments of the present application text are described below. For content that is essentially the same as that described with reference to Figs. 1, 2, 3, 4, 5, 6, 7 to 8, the same reference numerals have been assigned to components included in further embodiments, and overlapping content may be omitted or briefly described. Fig. 9 is a perspective exploded view of the display device according to a further embodiment. Fig. 10 is a schematic view showing a second light guide plate and its circumferential cross-sectional structure according to a further embodiment. Referring to Fig. 9 and Fig. 10, a display device 1_1 according to the present embodiment includes the second light guide plate 132 and the second light source assembly 131, which is arranged near the second light guide plate 132, however, the second light source assembly 131 can only be arranged on one side and the other side of the second light guide plate 132 in the second direction DR2. Figures 9 and 10 show that the second light source assembly 131 is arranged only on the far side of the second light guide plate 132 in the second direction DR2; however, the embodiments of the present application are not limited to this. For example, the second light source assembly 131 can be arranged only on one side of the second light guide plate 132 in the second direction DR2. In this case, the density per unit area of ​​the optical fiber pattern 132a on the second optical fiber plate 132 can decrease when the optical fiber patterns 132a are near the second light source assembly 131, and increase when the optical fiber patterns 132a are farther away from the second light source assembly 131. The density per unit area of ​​the optical fiber pattern 132a can increase from the far side to one side of the second optical fiber plate 132 in the second direction DR2. Since the density per unit area of ​​the light guide pattern 132a increases when the light guide patterns 132a are further away from the second light source assembly 131, the luminance uniformity can be improved depending on the viewing angle of the display device 1_1. Even in this case, since the second light sources LS2 of the second light source assembly 131 can each be controlled independently, the sizes of the first display area DA1 and the second display area DA2 can vary, thus providing the user with improved comfort. Additionally, since the second light source assembly 131 is arranged on only one side and the other side of the second light guide plate 132 in the second direction DR2, the manufacturing process costs can be reduced and the edging of the display device 1_1 can be reduced, thereby improving the aesthetics. Fig. 11 is a top view of the display device according to a further embodiment. Fig. 12 is a perspective exploded view of the display device according to a further embodiment. Referring to Figures 11 and 12, a display device 1_2 according to the present embodiment includes a display surface DA_2 and may further include a third display surface DA_3. Additionally, the display device 1_2 according to the present embodiment may further include a first boundary BD1 between the first display surface DA_1 and the second display surface DA_2 and a second boundary BD2 between the second display surface DA_2 and the third display surface DA_3. The first display area DA1, the second display area DA2 and the third display area DA3 can be arranged sequentially in the first direction DR1. The first display area DA1 can operate in a first mode, and the second display area DA2 and the third display area DA3 can operate in the first mode and a second mode, respectively. For example, the first mode can be a shared mode that does not restrict the lateral viewing angle of display device 1_2. The second mode can be a private mode that restricts the lateral viewing angle of display device 1_2. That is, the shared mode can have a wide viewing angle and the private mode can have a narrow viewing angle. This means that the first display area DA1 can maintain the shared-use mode while display device 1_2 is operating. The second display area DA2 and the third display area DA3 can optionally operate in shared-use or private mode while display device 1_2 is operating. If each of the multiple second light sources LS2 can be controlled and operated independently, the second display area DA2 and the third display area DA3 can each be switched independently from shared mode to private mode or from private mode to shared mode. Additionally, the sizes of the first display area DA1, the second display area DA2, and the third display area DA3 can vary. This means that if each of the multiple secondary light sources LS2 can be controlled and operated independently, the first boundary BD1 and the second boundary BD2 can move in the first direction DR1 by adjusting the number and arrangement of the switched-on secondary light sources LS2. If the first display area DA1 operates only in shared use mode, the first light sources LS1 and the second light sources LS2, which are arranged in the area corresponding to the first display area DA1, can be kept in the switched-on state. If the second display area DA2 operates in both shared and private modes, the first light sources LS1, located in the area corresponding to the second display area DA2, can be kept in an on state. Since the second light sources LS2, also located in the area corresponding to the second display area DA2, can be switched between on and off, the shared and private modes of the second display area DA2 can be toggled. Depending on the arrangement of the second light sources LS2, whose on and off states are switched, the arrangement of the second display area DA2 can vary and the first boundary BD1 between the first display area DA1 and the second display area DA2 can vary. If the third display area DA3 operates in both shared and private modes, the first light sources LS1, located in the area corresponding to the third display area DA3, can be kept in an on state. Since the second light sources LS2, also located in the area corresponding to the third display area DA3, can be switched between on and off, the shared and private modes of the third display area DA3 can be toggled. Depending on the arrangement of the second light sources LS2, whose on and off states are switched, the arrangement of the third display area DA3 can vary and the second boundary BD2 between the second display area DA2 and the third display area DA3 can vary. Even in this case, since the second light sources LS2 of the second light source assembly 131 can each be controlled independently, the sizes of the first display area DA1, the second display area DA2 and the third display area DA3 can vary, thus providing the user with improved comfort. Additionally, since the display area in which the shared use mode and the private mode can be switched is formed from the second display area DA2 and the third display area DA3, a screen display method of the display device 1_2 can be more different, thus providing the user with improved ease of use of the display device 1_2. A display device according to various embodiments of the present application text can be described as follows. According to embodiments of the present application, a display device is provided comprising several first light sources, a diffuser plate arranged on the first light sources, a prism plate arranged on the diffuser plate, a thin light control layer arranged on the prism plate, a light guide plate arranged on the thin light control layer and having a longer side extending in a first direction and a shorter side extending in a second direction intersecting the first direction, and several second light sources arranged such that they face the longer side of the light guide plate, wherein the several second light sources are arranged repeatedly in the first direction and are each controlled independently. According to various embodiments of the present application text, the display device may further comprise a first display area which is operated in a shared-use mode with a wide viewing angle, and a second display area in which the shared-use mode with the wide viewing angle and a private mode with a narrow viewing angle are switched. According to various embodiments of the present application text, the first display area and the second display area can be arranged in the first direction. According to various embodiments of the present application text, when the second display area operates in a shared-use mode, some of the multiple second light sources corresponding to the second display area may be switched on, and when the second display area operates in a private mode, some of the multiple second light sources corresponding to the second display area may be switched off. According to various embodiments of the present application text, when the first display area is operating in a shared-use mode, the remaining of the several second light sources corresponding to the first display area can be switched on. According to various embodiments of the present application text, the light guide plate may further include several light guide patterns arranged on a back surface opposite the thin light control layer, and the density per unit area of ​​the several light guide patterns may increase as the light guide patterns are further away from the several second light sources. According to various embodiments of the present application text, the multiple second light sources can be arranged on both one side and the far side of the light guide plate in the second direction, and the density per unit area of ​​the multiple light guide patterns can increase from a longer side of the light guide plate to a central section of the light guide plate in the second direction. According to various embodiments of the present application text, the multiple light guide patterns can have a pyramid shape projecting towards the thin light control layer, and the inclinations of the four side surfaces forming the pyramid shape can all be the same. According to various embodiments of the present application text, the thin light control layer can contain several light-shielding patterns and patterned thin insulating layers between the light-shielding patterns, and the several light-shielding patterns can run in the second direction and can be arranged repeatedly in the first direction. According to various embodiments of the present application text, the multiple light-shielding patterns can have the same thickness in one thickness direction and can be arranged repeatedly at regular intervals in the first direction. According to various embodiments of the present application text, the prism plate can comprise a first prism plate and a second prism plate stacked sequentially, and can have a prism pattern of the first prism plate and a prism pattern of the second prism plate axes that are orthogonal to each other. According to various embodiments of the present application text, the display device may further include a display panel arranged on the light guide plate, wherein the display panel may include a lower substrate, an upper substrate and a liquid crystal layer between the lower substrate and the upper substrate. According to various embodiments of the present application text, the multiple first light sources can be arranged below the scattering plate. According to various embodiments of the present application text, the multiple second light sources can be arranged on only one side and the other side of the light guide plate in the second direction. According to various embodiments of the present application text, the light guide plate may further include several light guide patterns arranged on a back surface opposite the thin light control layer, and the density per unit area of ​​the several light guide patterns may increase as the light guide patterns are further away from the several second light sources. According to embodiments of the present application, a display device is provided comprising a first display surface operating in a shared-use mode with a wide viewing angle, a second display surface arranged on one side of the first display surface in a first direction and switching between the shared-use mode with the wide viewing angle and a private mode with a narrow viewing angle, a boundary between the first display surface and the second display surface extending in a second direction intersecting the first direction, several first light sources arranged over the first display surface and the second display surface, a light guide plate arranged on the first light sources, and several second light sources arranged in such a manner.that they are facing a side surface of the light guide plate and are arranged repeatedly in the first direction, wherein the boundary between the first display area and the second display area can move in the first direction according to the on and off states of the multiple second light sources. According to various embodiments of the present application text, when the second display area operates in a shared-use mode, a portion of the multiple second light sources corresponding to the second display area may be switched on, and when the second display area operates in a private mode, a portion of the multiple second light sources corresponding to the second display area may be switched off. According to various embodiments of the present application text, when the first display area is operating in a shared-use mode, the remaining of the several second light sources corresponding to the first display area can be switched on. According to various embodiments of the present application text, the light guide plate can further comprise several light guide patterns arranged on a rear surface facing the several first light sources, and the density per unit area of ​​the several light guide patterns can increase as the light guide patterns are further away from the several second light sources. According to various embodiments of the present application text, the multiple second light sources can be arranged on both one side and the far side of the light guide plate in the second direction, and the density per unit area of ​​the multiple light guide patterns can increase from a side surface of the light guide plate to a central section of the light guide plate in the second direction. DESCRIPTION OF REFERENCE MARKS 1 Display device DA Display area NDA Non-display area 110 Display panel 120 First backlight unit 121 First light source assembly 122 First light guide plate 123 Diffuser plate 124 Prism plate 125 Thin light control layer 130 Second backlight unit 131 Second light source assembly 132 Second light guide plate 132a Light guide pattern QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature KR 10-2025-0024780

[0001]

Claims

Display device (1) comprising: several first light sources (LS1); a diffuser plate (123) on the first light sources (LS1); a prism plate (124) on the diffuser plate (123); a thin light control layer (125) on the prism plate (124); a light guide plate (132) on the thin light control layer (125) having a longer side oriented in a first direction (DR1) and a shorter side oriented in a second direction (DR2) intersecting the first direction (DR1); and several second light sources (LS2) arranged facing the longer side of the light guide plate (132), the several second light sources (LS2) being arranged repeatedly in the first direction (DR1) and each being controlled independently. Display device according to claim 1, further comprising: a first display area (DA1) operated in a shared use mode with a wide viewing angle; and a second display area (DA2) configured to switch between the shared use mode with the wide viewing angle and a private mode with a narrow viewing angle. Display device according to claim 2, wherein the first display area (DA1) and the second display area (DA2) are arranged in the first direction (DR1). Display device according to claim 3, wherein when the second display area (DA2) operates in shared use mode, a portion of the multiple second light sources (LS2) corresponding to the second display area (DA2) is switched on, and when the second display area (DA2) operates in private mode, a portion of the multiple second light sources (LS2) corresponding to the second display area (DA2) is switched off. Display device according to a preceding claim, wherein a boundary between the first display area (DA1) and the second display area (DA2) extends in the second direction (DR2) and the boundary between the first display area (DA1) and the second display area (DA2) in the first direction (DR1) is variable based on the switching on and off of the multiple second light sources. Display device according to a preceding claim, wherein the light guide plate (132) further comprises several light guide patterns (132a) on a rear surface opposite the thin light control layer, and the density per unit area of ​​the several light guide patterns (132a) increases as the light guide patterns (132a) are further away from the several second light sources (LS2). Display device according to claim 6, wherein the multiple second light sources (LS2) are arranged on both one side and the far side of the light guide plate (132) in the second direction (DR2) and the density per unit area of ​​the multiple light guide patterns (122) increases from the far side of the light guide plate (132) to a central section of the light guide plate (132) in the second direction (DR2). Display device according to claim 7, wherein the multiple light guide patterns (132a) have a pyramid shape projecting towards the thin light control layer (125), and inclinations of the four side surfaces forming the pyramid shape are all the same. Display device according to a preceding claim, wherein the thin light control layer (125) contains several light shielding patterns (BP) and thin patterned insulating layers (IL) between the light shielding patterns (BP), and the several light shielding patterns (BP) extend in the second direction (DR2) and are arranged repeatedly in the first direction (DR1). Display device according to claim 9, wherein the multiple light-shielding patterns (BP) have the same thickness in one thickness direction and are arranged repeatedly at regular intervals in the first direction (DR1). Display device according to a preceding claim, wherein the prism plate (124) comprises a first prism plate (124a) and a second prism plate (124b) which are stacked sequentially, and a prism pattern of the first prism plate (124a) and a prism pattern of the second prism plate (124b) have axes which are orthogonal to each other. Display device according to a preceding claim, further comprising a display panel (110) on the light guide plate (132), wherein the display panel (110) comprises a lower substrate, an upper substrate and a liquid crystal layer between the lower substrate and the upper substrate. Display device according to a preceding claim, wherein the multiple first light sources (LS1) are arranged under the diffuser plate (123). Display device according to a preceding claim, wherein the multiple second light sources (LS2) are arranged on only one side and the further side of the light guide plate (132) in the second direction (DR2). Display device according to claim 14, wherein the light guide plate (132) further comprises several light guide patterns (132a) on a rear surface opposite the thin light control layer (125), and the density per unit area of ​​the several light guide patterns (132a) increases as the light guide patterns (132a) are further away from the several second light sources (LS2). Display device (1) comprising: a first display area (DA1) operating in a shared-use mode with a wide viewing angle; a second display area (DA2) arranged on one side of the first display area (DA1) in a first direction (DR1) and configured to switch between the shared-use mode with the wide viewing angle and a private mode with a narrow viewing angle; a boundary (BD) between the first display area (DA1) and the second display area (DA2) extending in a second direction (DR2) intersecting the first direction (DR1); multiple first light sources (LS1) arranged above the first display area (DA1) and the second display area (DA2);a light guide plate (132) on the first light sources (LS) and several second light sources (LS2) arranged such that they face a side surface of the light guide plate (132) and are arranged repeatedly in the first direction (DR1), wherein the boundary (BD) between the first display area (DA1) and the second display area (DA2) is configured to vary in the first direction (DR1) according to the on and off states of the several second light sources (LS2). Display device according to claim 16, wherein when the second display area (DA2) operates in shared use mode, a sub-area of ​​the multiple second light sources (LS2) corresponding to the second display area (DA2) is switched on, and when the second display area (DA2) operates in private mode, a sub-area of ​​the multiple second light sources (LS2) corresponding to the second display area (DA2) is switched off. Display device according to claim 17, wherein when the first display area (DA1) is operating in shared use mode, the remaining of the multiple second light sources (LS2) corresponding to the first display area (DA1) are switched on. Display device according to one of claims 16 to 18, wherein the light guide plate (132) further comprises several light guide patterns (132a) on a rear surface facing the several first light sources (LS1), and the density per unit area of ​​the several light guide patterns (132a) increases as the light guide patterns (132a) are further away from the several second light sources (LS2). Display device according to claim 19, wherein the multiple second light sources (LS2) are arranged on both one side and the far side of the light guide plate (132) in the second direction (DR2) and the density per unit area of ​​the multiple light guide patterns (132a) increases from the side surface of the light guide plate (132) to a central section of the light guide plate (132) in the second direction (DR2).

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