Patent Publication Number: US-2022231098-A1

Title: Display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from and the benefit of Korean Patent Application No. 10-2021-0006474, filed on Jan. 18, 2021 which is hereby incorporated by reference for all purposes as if fully set forth herein. 
     BACKGROUND 
     Field 
     Embodiments of the invention relate generally to a display device and more specifically, to a display device having a variable view angle mode. 
     Discussion of the Background 
     The importance of display devices has steadily increased with the development of multimedia technology. In response thereto, various types of display devices such as an organic is light emitting display (OLED), a liquid crystal display (LCD) and the like have been used. Such display devices have been variously applied to various mobile electronic devices, for example, portable electronic devices such as a smart phone, a smart watch, and a tablet PC. 
     As the demands of users are gradually diversified, in addition to a wide viewing angle mode, a narrow viewing angle mode is also required. 
     The above information disclosed in this Background section is only for understanding of the background of the inventive concepts, and, therefore, it may contain information that does not constitute prior art. 
     SUMMARY 
     Display devices constructed according to the principles of the invention are capable of displaying a narrow viewing angle mode and a wide viewing angle mode according to a user&#39;s selection by moving a light absorbing solution through a mechanical force. The display devices include a light path control member configured so that the display devices have the narrow viewing angle mode when the light absorbing solution is injected into the inside of a channel and the display devices have the wide viewing angle mode when the light absorbing solution is discharged to the outside of the channel, and display the narrow viewing angle mode or the wide viewing angle mode according to the user&#39;s selection. 
     Additional features of the inventive concepts will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts. 
     According to an aspect of the invention, a display device includes: a display panel; and a light path control member disposed on the display panel, wherein the light path is control member includes: a housing including a plurality of partition walls and a channel defined between two adjacent partition walls among the plurality of partition walls; a light absorbing solution configured to block transmission of light; and a first fluid transfer portion configured to control flowing of the light absorbing solution into and out of the channel. 
     The light path control member may further include a connection portion for providing a fluid connection between the housing and the first fluid transfer portion. 
     The housing further may include a first accommodating portion disposed between the channel and the connection portion and configured to accommodate at least a part of the light absorbing solution, the first accommodating portion having a fluid connection with the connection portion and the channel. 
     The display panel may include a display area and a non-display area disposed around the display area, and wherein the display area may overlap the channel. 
     The housing may further include a first accommodating portion having a fluid connection with the channel and configured to accommodate at least a part of the light absorbing solution, and the non-display area may overlap the first accommodating portion. 
     A width of each of the plurality of partition walls may be greater than a width of the channel. 
     The plurality of partition walls may extend in substantially parallel with each other. 
     The display panel may include a first edge extending in a first direction and a second edge extending in a second direction intersecting the first direction, and the plurality of partition walls may extend in any one of the first direction and the second direction. 
     The display panel may include a first edge extending in a first direction and a is second edge extending in a second direction intersecting the first direction, and the plurality of partition walls may extend in a third direction intersecting the first direction and the second direction. 
     At least one of the plurality of partition walls may include a plurality of sub-partition walls spaced apart from each other in one direction. 
     The light path control member may further include a light transmitting fluid which may be not mixed with the light absorbing solution and may be disposed inside the housing. 
     The light transmitting fluid may include a light transmitting solution, and a difference in refractive index between the light transmitting solution and each of the plurality of partition walls may be about 0.5 or less. 
     A density of the light transmitting solution may be less than a density of the light absorbing solution. 
     The housing may further include: a first accommodating portion having a fluid connection with the channel and configured to accommodate at least a part of the light absorbing solution; and a second accommodating portion having a fluid connection with the channel and configured to accommodate at least a part of the light transmitting fluid, and wherein the second accommodating portion may be located on an opposite side of the first accommodating portion with the channel interposed therebetween. 
     The light path control member may further include a second fluid transfer portion configured to control flowing of the light transmitting fluid into and out of the channel. 
     The first fluid transfer portion may be configured to control flowing of the light transmitting fluid into and out of the channel. 
     According to another aspect of the invention, a display device include: a display is panel; and a light path control member disposed on the display panel, wherein the light path control member includes: a housing including a plurality of partition walls and a channel defined between adjacent partition walls among the plurality of partition walls; and a light absorbing solution configured to block transmission of light, and wherein the light path control member is configured to charge the light absorbing solution into the channel in a first mode and discharge the light absorbing solution to an outside of the channel in a second mode different from the first mode. 
     In the first mode, the light absorbing solution filled in the channel may overlap a display area of the display panel, and in the second mode, the light absorbing solution may not overlap the display area of the display panel. 
     The light path control member may further include a light transmitting fluid, and the light path control member may be configured to charge the light transmitting fluid into the channel in the second mode and discharge the light transmitting fluid to the outside of the channel in the first mode. 
     The light path control member may further include a fluid transfer portion configured to control flowing of the light absorbing solution into and out of the channel. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention, and together with the description serve to explain the inventive concepts. 
         FIG. 1  is a perspective view of an embodiment of a display device constructed according to the principles of the invention. 
         FIG. 2  is an exploded perspective view of the display device of  FIG. 1 . 
         FIG. 3  is a cross-sectional view of a display panel of the display device of  FIG. 2 . 
         FIG. 4  is a schematic diagram illustrating a situation in which a user views the display device of  FIG. 2  from a position having a predetermined viewing angle. 
         FIG. 5  is a schematic diagram of an embodiment of a light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 6  is an enlarged view of area Q of  FIG. 5 . 
         FIG. 7  is a cross-sectional view taken along line VII-VII′ of  FIG. 5 . 
         FIG. 8  is a cross-sectional view taken along line VIII-VIII′ of  FIG. 5 . 
         FIG. 9  is a cross-sectional view taken along line IX-IX′ of  FIG. 5 . 
         FIG. 10  is a schematic diagram illustrating a narrow view angle mode of the light path control member of  FIG. 5 . 
         FIG. 11  is a cross-sectional view taken along line XI-XI′ of  FIG. 10 . 
         FIGS. 12 and 13  are schematic views illustrating that light passes through area R of  FIG. 11 . 
         FIG. 14  is a schematic diagram of another embodiment of the light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 15  is a schematic diagram illustrating a narrow view angle mode of the light path control member of  FIG. 14 . 
         FIG. 16  is a schematic diagram of still another embodiment of the light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 17  is a schematic diagram illustrating a narrow view angle mode of the light path control member of  FIG. 16 . 
         FIG. 18  is a schematic diagram of still another embodiment of the light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 19  is a schematic diagram illustrating a narrow view angle mode of the light path control member of  FIG. 18 . 
         FIG. 20  is a schematic diagram of still another embodiment of the light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 21  is a schematic diagram illustrating a narrow view angle mode of the light path control member of  FIG. 20 . 
         FIG. 22  is a schematic diagram of still another embodiment of the light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 23  is a schematic diagram illustrating a narrow view angle mode of the light path control member of  FIG. 22 . 
         FIG. 24  is a schematic diagram of still another embodiment of the light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 25  is a schematic diagram illustrating a narrow view angle mode of the light path control member of  FIG. 24 . 
         FIG. 26  is a schematic diagram of still another embodiment of the light path control member of the display device of  FIG. 2  in a wide view angle mode. 
         FIG. 27  is a schematic diagram illustrating a narrow view angle mode of the light is path control member of  FIG. 26 . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various exemplary embodiments or implementations of the invention. As used herein “embodiments” and “implementations” are interchangeable words that are non-limiting examples of devices or methods employing one or more of the inventive concepts disclosed herein. It is apparent, however, that various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring various exemplary embodiments. Further, various exemplary embodiments may be different, but do not have to be exclusive. For example, specific shapes, configurations, and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concepts. 
     Unless otherwise specified, the illustrated exemplary embodiments are to be understood as providing exemplary features of varying detail of some ways in which the inventive concepts may be implemented in practice. Therefore, unless otherwise specified, the features, components, modules, layers, films, panels, regions, and/or aspects, etc. (hereinafter individually or collectively referred to as “elements”), of the various embodiments may be otherwise combined, separated, interchanged, and/or rearranged without departing from the inventive concepts. 
     The use of cross-hatching and/or shading in the accompanying drawings is is generally provided to clarify boundaries between adjacent elements. As such, neither the presence nor the absence of cross-hatching or shading conveys or indicates any preference or requirement for particular materials, material properties, dimensions, proportions, commonalities between illustrated elements, and/or any other characteristic, attribute, property, etc., of the elements, unless specified. Further, in the accompanying drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. When an exemplary embodiment may be implemented differently, a specific process order may be performed differently from the described order. For example, two consecutively described processes may be performed substantially at the same time or performed in an order opposite to the described order. Also, like reference numerals denote like elements. 
     When an element, such as a layer, is referred to as being “on,” “connected to,” or “coupled to” another element or layer, it may be directly on, connected to, or coupled to the other element or layer or intervening elements or layers may be present. When, however, an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, there are no intervening elements or layers present. To this end, the term “connected” may refer to physical, electrical, and/or fluid connection, with or without intervening elements. Further, the X-axis, the Y-axis, and the Z-axis are not limited to three axes of a rectangular coordinate system, such as the x, y, and z-axes, and may be interpreted in a broader sense. For example, the X-axis, the Y-axis, and the Z-axis may be perpendicular to one another, or may represent different directions that are not perpendicular to one another. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be construed as X only, Y only, Z only, or any combination of two or more of X, Y, and Z, such as, for instance, XYZ, XYY, YZ, and ZZ. As used herein, the term is “and/or” includes any and all combinations of one or more of the associated listed items. 
     Although the terms “first,” “second,” etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. Thus, a first element discussed below could be termed a second element without departing from the teachings of the disclosure. 
     Spatially relative terms, such as “beneath,” “below,” “under,” “lower,” “above,” “upper,” “over,” “higher,” “side” (e.g., as in “sidewall”), and the like, may be used herein for descriptive purposes, and, thereby, to describe one elements relationship to another element(s) as illustrated in the drawings. Spatially relative terms are intended to encompass different orientations of an apparatus in use, operation, and/or manufacture in addition to the orientation depicted in the drawings. For example, if the apparatus in the drawings is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. Furthermore, the apparatus may be otherwise oriented (e.g., rotated  90  degrees or at other orientations), and, as such, the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms, “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Moreover, the terms “comprises,” “comprising,” “includes,” and/or “including,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. is It is also noted that, as used herein, the terms “substantially,” “about,” and other similar terms, are used as terms of approximation and not as terms of degree, and, as such, are utilized to account for inherent deviations in measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art. 
     Various exemplary embodiments are described herein with reference to sectional and/or exploded illustrations that are schematic illustrations of idealized exemplary embodiments and/or intermediate structures. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, exemplary embodiments disclosed herein should not necessarily be construed as limited to the particular illustrated shapes of regions, but are to include deviations in shapes that result from, for instance, manufacturing. In this manner, regions illustrated in the drawings may be schematic in nature and the shapes of these regions may not reflect actual shapes of regions of a device and, as such, are not necessarily intended to be limiting. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure is a part. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense, unless expressly so defined herein. 
       FIG. 1  is a perspective view of a display device according to an embodiment.  FIG. 2  is an exploded perspective view of a display device according to an embodiment.  FIG. 3  is an exemplary cross-sectional view of a display panel according to an embodiment.  FIG. 4  is a schematic diagram illustrating a situation in which a user views a display device according to an is embodiment from a position having a predetermined viewing angle. 
     Referring to  FIGS. 1, 2, 3, and 4 , a display device  1  is a device for displaying a moving image or a still image. The display device  1  may be used as a display screen of various devices, such as a television, a laptop computer, a monitor, a billboard and an Internet-of-Things (JOT) device, as well as portable electronic devices such as a mobile phone, a smartphone, a tablet personal computer (PC), a smart watch, a watch phone, a mobile communication terminal, an electronic notebook, an electronic book, a portable multimedia player (PMP), a navigation device and an ultra-mobile PC (UMPC). 
     The display device  1  according to an embodiment includes a display panel  100  for displaying an image and a light path control member LCF that is disposed on the display panel  100  and capable of adjusting a viewing angle of the display device  1 . 
     The display panel  100  may include a display area DA and a non-display area NDA. The display area DA is an area where an image can be displayed, and the non-display area NDA is an area where an image is not displayed. The display area DA may also be referred to as an active region, and the non-display area NDA may also be referred to as a non-active region. The display area DA may be disposed at the center of the display device  1  to occupy most of the front surface of the display device  1 . 
     The non-display area NDA may be disposed around the display area DA. The non-display area NDA may completely or partially surround the display area DA. The display area DA may have a rectangular shape, and the non-display area NDA may be disposed adjacent to four sides of the display area DA. The non-display area NDA may form a bezel of the display device  1 . Wires or circuit drivers included in the display device  1  may be disposed in the non-display area NDA, or external devices may be mounted thereon. 
     The planar shape of the display panel  100  may be variously modified. For example, the display device  1  may have a shape such as a rectangular shape elongated in a horizontal direction, a rectangular shape elongated in a vertical direction, a square shape, a quadrilateral shape with rounded corners (e.g., vertices), other polygonal shapes and a circular shape. In an embodiment, the display panel  100  may include a first edge LS extending in a first direction X and a second edge SS extending in a second direction Y intersecting the first direction X. For example, the first edge LS of the display panel  100  may be a long side, and the second edge SS may be a short side shorter than the first edge LS. However, embodiments are not limited thereto. The shape of the display area DA of the display panel  100  may also be similar to the overall planar shape of the display panel  100 . 
     Examples of the display panel  100  may include an inorganic light emitting diode display panel, an organic light emitting diode display panel, a quantum dot light emitting display panel, a plasma display panel, a field emission display panel, or the like. In the following description, a case where an organic light emitting diode display panel is applied as an example of the display panel  100  will be exemplified, but embodiments are not limited thereto, and other display panels may be applied to various technical areas and fields. 
     Hereinafter, a detailed stacked structure of the display area DA of the display panel  100  according to an embodiment will be briefly described. 
     The display panel  100  may include a substrate SUB and various conductive layers and insulating layers disposed on the substrate SUB. 
     The substrate SUB may be an insulating substrate. The substrate SUB may support various conductive layers and insulating layers to be described later. 
     A buffer layer BU may be disposed on the substrate SUB. The buffer layer BU is can prevent diffusion of impurity ions, prevent penetration of moisture or external air, and perform a surface planarization function. 
     The semiconductor layer ACT may be disposed on the buffer layer BU. The semiconductor layer ACT may include monocrystalline silicon, low temperature polycrystalline silicon, amorphous silicon, or the like. 
     A gate insulating layer GI may be disposed on the semiconductor layer ACT. The gate insulating layer GI may be made of an inorganic material. 
     A gate electrode GE may be disposed on the gate insulating layer GI. The gate electrode GE may be connected to a gate wire to receive a gate signal. 
     An interlayer insulating layer ILD may be disposed on the gate electrode GE. The interlayer insulating layer ILD may be disposed over the gate electrode GE and the gate insulating layer GI. The interlayer insulating layer ILD may be formed of an organic material or an inorganic material, and may be a single layer or a multilayer stack of different materials. 
     A source electrode SE and a drain electrode DE may be disposed on the interlayer insulating layer ILD. Each of the source electrode SE and the drain electrode DE may penetrate the interlayer insulating layer ILD and the gate insulating layer GI, and may be electrically connected to the semiconductor layer ACT. The source electrode SE may be connected to a data wire to receive a data signal. 
     The semiconductor layer ACT, the gate electrode GE, the source electrode SE, and the drain electrode DE may form a thin film transistor TFT, which is a switching element. 
     A planarization layer PLA may be disposed on the source electrode SE and the drain electrode DE. In some embodiments, the planarization layer PLA may be formed of an organic material, but embodiments are not limited thereto. 
     A pixel electrode PXE may be disposed on the planarization layer PLA. The pixel electrode PXE may penetrate the planarization layer PLA to be connected to the drain electrode DE. In some embodiments, the pixel electrode PXE may be an anode electrode. 
     A pixel defining layer PDL partially exposing the pixel electrode PXE may be disposed on the planarization layer PLA. In some embodiments, the pixel defining layer PDL may be formed of an organic material. 
     A light emitting layer EML for emitting light L may be disposed on the pixel electrode PXE exposed by the pixel defining layer PDL. For example, the light emitting layer EML may be a multilayer further including one or more of a hole injection layer (HIL), a hole transporting layer (HTL), an electron transporting layer (ETL), and an electron injection layer (EIL). 
     A common electrode CME may be disposed on the light emitting layer EML and the pixel defining layer PDL. In some embodiments, the common electrode CME may be a cathode electrode. 
     The pixel electrode PXE, the light emitting layer EML, and the common electrode CME may form a light emitting element EMD. 
     A thin film encapsulation layer TFEL may be disposed on the light emitting element EMD. The thin film encapsulation layer TFEL may seal the light emitting element EMD and prevent moisture or the like from permeating or penetrating into the light emitting element EMD from the outside. In some embodiments, the thin film encapsulation layer TFEL may entirely cover the display area DA. 
     The thin film encapsulation layer TFEL may include one or more organic layers and one or more inorganic layers. For example, the thin film encapsulation layer TFEL may include a first inorganic layer TFE 1  disposed on the common electrode CME, an organic layer TFE 2  disposed on the first inorganic layer TFE 1 , and a second inorganic layer TFE 3  disposed on the organic layer TFE 2 . 
     The first inorganic layer TFE 1  may prevent moisture, oxygen, or the like from permeating or penetrating into the light emitting element EMD. 
     The organic layer TFE 2  may improve the flatness of the thin film encapsulation layer TFEL. The organic layer TFE 2  may be formed of a liquid organic material. 
     The second inorganic layer TFE 3  may perform a role substantially the same as or similar to the first inorganic layer TFE 1 , and may be formed of a material substantially the same or similar to the first inorganic layer TFE 1 . The second inorganic layer TFE 3  may completely cover the organic layer TFE 2 . 
     The display device  1  according to an embodiment may display an image at a viewing angle of a predetermined first angle α with respect to a direction perpendicular to the display surface. For example, the display device  1  may emit light within the range of the first angle α with respect to a direction perpendicular to the display surface, and a user positioned within the range of the first angle α may visually recognize the image displayed on the display device  1 . For example, the range of the first angle α may be about 150° or more, about 160° or more, or about 170° or more. 
     In some cases, the display device  1  needs to have a narrow viewing angle. When the display device  1  according to an embodiment is applied to a vehicle monitor, for example, light emitted from the display device  1  at the first angle α as a viewing angle may be reflected on a vehicle windshield CW and visually recognized by the driver. In particular, the light L emitted from the display device  1  and reflected on the vehicle windshield CW during driving at night is may interfere with the driver&#39;s view, thereby causing a risk of a vehicle accident. Accordingly, the display device  1  needs to emit light L at a narrow viewing angle according to a user&#39;s selection. Moreover, in order to protect the user&#39;s personal privacy, the display device  1  needs to emit light L at a narrow viewing angle so that the image is not visually recognized by other people positioned around the user. 
     The display device  1  according to an embodiment may display an image at a viewing angle of a second angle β smaller than the first angle α. For example, the display device  1  may emit light within the range of a second angle β that is smaller than the first angle α with respect to a direction perpendicular to the display surface, and a user positioned within the range of the second angle β may visually recognize an image displayed on the display device  1 . For example, the range of the second angle may be about 90° or less, about 80° or less, about 70° or less, or about 60° or less. 
     As described above, in order to variously adjust the viewing angle of the display device  1  to the first viewing angle α or the second angle β, or the like, the light path control member LCF may be required. 
     The light path control member LCF may be disposed on the display panel  100 . The light path control member LCF may control a path of light emitted from the display panel  100 . Specifically, the light path control member LCF may control the viewing angle of the display device  1 . 
     The light path control member LCF may be disposed on the front surface which is the display surface of the display panel  100 . For example, light emitted from the display panel  100  may pass through the light path control member LCF and exit to the outside. 
     The light path control member LCF may include a housing  200 , a fluid transfer is portion  300  disposed outside the housing  200 , and a connection portion  400  connecting the housing  200  and the fluid transfer portion  300 . As will be described later, the light path control member LCF may further include a light absorbing solution (see ‘SL 1 ’ in  FIG. 5 ) disposed inside at least one of the housing  200 , the fluid transfer portion  300 , and the connection portion  400 . In the light path control member LCF, the housing  200  may be disposed to overlap the display panel  100 . 
     A detailed description of the light path control member LCF will be described later with reference to  FIGS. 5 to 13 . Specifically, the description of the light path control member LCF will first describe a wide viewing angle mode, in which the light path control member LCF does not affect the path of light emitted from the display panel  100  with reference to  FIGS. 5 to 9 , and will describe a narrow viewing angle mode, in which the light path control member LCF limits the path of light emitted from the display panel  100  with reference to  FIGS. 10 to 13 . 
       FIG. 5  is a schematic diagram of a light path control member according to an embodiment.  FIG. 6  is an enlarged view of area Q of  FIG. 5 .  FIG. 7  is a cross-sectional view taken along line VII-VII′ of  FIG. 5 .  FIG. 8  is a cross-sectional view taken along line VIII-VIII′ of  FIG. 5 .  FIG. 9  is a cross-sectional view taken along line IX-IX′ of  FIG. 5 . 
     Referring to  FIGS. 5 to 9 , the light path control member LCF according to an embodiment may include the housing  200 , the fluid transfer portion  300  disposed outside the housing  200 , and the connection portion  400  connecting housing  200  and the fluid transfer portion  300 . 
     The housing  200  may provide a space filled with the light absorbing solution SL 1  so that the light absorbing solution SL 1 , which will described later, forms a louver (refer to ‘LV’ is in  FIG. 10 ) for controlling the light path. The louver may be a light blocking member that prevents the light L from proceeding so that the light L proceeds only in a specific direction. 
     The housing  200  according to an embodiment may include a housing cover  201  and a plurality of partition walls PW disposed inside the housing cover  201 . The housing  200  may have a film shape. 
     The planar shape of the housing cover  201  may be substantially the same as the planar shape of the display panel (refer to ‘ 100 ’ in  FIG. 1 ) on which the housing  200  overlaps. The housing cover  201  may be formed of a flexible polymer material, but embodiments are not limited thereto. For example, the housing cover  201  may be formed of a rigid material. For example, the housing cover  201  may include at least one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polymethyl methacrylate (PMMA), polystyrene (PS), polyvinylchloride (PVC), polyethersulfone (PES), polyethylene (PE), polypropylene (PP), polyimide (PI), and glass, but embodiments are not limited thereto. 
     Each of the plurality of partition walls PW may extend in the second direction Y. The plurality of partition walls PW may be arranged along the first direction X. In an embodiment, a length of each partition wall PW in the first direction X and a length of each partition wall PW in the second direction Y may be substantially constant or uniform for each area. For example, each partition wall PW may have a first width W 1  in the first direction X and a first length H 1  in the second direction Y. The first width W 1 , which is a length of each partition wall PW in the first direction X, may be about 30 μm to about 100 μm, and the first length H 1 , which is a length of each partition wall PW in the second direction Y, may be substantially the same as the length in the second direction Y of the display area DA of the display panel  100  on is which the light path control member LCF is disposed. 
     The adjacent partition walls PW among the plurality of partition walls PW may be disposed to be spaced apart from each other. A separation distance between the adjacent partition walls PW among the plurality of partition walls PW may have a second width W 2  smaller than the first width W 1 . The second width W 2  may be about 5 μm to 50 μm. As will be described later, the second width W 2  may be substantially the same as the width of a channel CH in the first direction X. 
     The housing  200  may include the channels CH defined between the adjacent partition walls PW among the plurality of partition walls PW and the housing cover  201 , and between each partition wall PW disposed at the outermost side on the one side and the other side of the first direction X among the plurality of partition walls PW, and the housing cover  201 . Accordingly, there are a plurality of channels CH, and the plurality of channels CH may be disposed to be spaced apart along the first direction X. In addition, the width of each channel CH in the first direction X may be substantially the same as the second width W 2 , which is a separation distance between the adjacent partition walls PW among the plurality of partition walls PW, and the separation distance between the channels CH disposed adjacent to each other among the plurality of channels CH may have the first width W 1  that is a length of each partition wall PW in the first direction X. 
     In addition, each channel CH may have a third width W 3  in the third direction Z. The third width W 3  may be about 50 μm to about 100 μm, but embodiments are not limited thereto. The first width W 1  and the third width W 3  may have substantially the same value. As described above, the second width W 2 , which is the width of each channel CH in the first direction X, may be about 5 μm to 50 μm. When the width of each channel CH in the first is direction X is about 5 μm or more, the light L emitted from the display panel  100  reaches the user&#39;s naked eye in a sufficient amount so that the user may visually recognize a stable image, and when it is about 50 μm or less, it is possible to secure a narrow viewing angle so that only a user who watches the display device  1  from the front surface may visually recognize the light L emitted from the display panel  100 . 
     The channels CH may extend in the second direction Y. In the wide viewing angle mode, the channels CH may be filled with a transparent fluid. For example, in the wide viewing angle mode, the channels CH may be filled with a transparent colorless gas such as air or an inert gas. As will be described later, the channels CH may be filled with the light absorbing solution SL 1  in the narrow viewing angle mode to form the louver LV. 
     The interior of the housing  200  may include a louver portion  220  in which the partition wall PW is disposed, a first fluid accommodating portion  210  disposed on a first side (e.g., the right side) of the louver portion  220 , and a second fluid accommodating portion  230  disposed on a second side (e.g., the left side) of the louver portion  220 . The first side and the second side of the louver portion  220  may face each other in the second direction Y. 
     The partition walls PW and the channels CH may be disposed in the louver portion  220  as described above. The louver portion  220  may overlap the display area DA of the display panel  100  that overlaps the housing  200 . Specifically, the partition walls PW and the channels CH may overlap the display area DA of the display panel  100 . The edge of the display area DA may be disposed inside the louver portion  220 . The first fluid accommodating portion  210  may be disposed on the other side of the second direction Y of the partition walls PW, and may be spatially connected to the channels CH and the connection portion  400  to be described later. In the description, being spatially connected means a fluid connection that substances such is as fluids positioned therein may move or interchange therebetween. In other words, the material positioned in the first fluid accommodating portion  210  may move to the channels CH and the connection portion  400 , and conversely, the material positioned in the channels CH and the connection portion  400  may move to the first fluid accommodating portion  210 . The first fluid accommodating portion  210  may accommodate at least a part of the light absorbing solution SL 1 . 
       FIGS. 5 to 9  illustrate that the light absorbing solution SL 1  is partially disposed in the first fluid accommodating portion  210  in the wide viewing angle mode, but embodiments are not limited thereto, and the light absorbing solution SL 1  may not be disposed in the first fluid accommodating portion  210  in the wide viewing angle mode. The second fluid accommodating portion  230  may be disposed on one side of the partition wall PW in the second direction Y and may be spatially connected to the channels CH. In other words, the second fluid accommodating portion  230  may be positioned on the opposite side of the first fluid accommodating portion  210  with the channels CH interposed therebetween. For example, the second fluid accommodating portion  230  may be in a fluid connection with the channels CH. In addition, a material positioned in the second fluid accommodating portion  230  and a material positioned in the channels CH may move or interchange therebetween. The second fluid accommodating portion  230  may accommodate at least a part of gas AR. 
     In the wide viewing angle mode, the channels CH and the second fluid accommodating portion  230  inside the housing  200  may be filled with the gas AR. Moreover, an area of the first fluid accommodating portion  210  in which the light absorbing solution SL 1  is not disposed may also be filled with the gas AR. Here, the gas AR may be colorless air or an inert gas. 
     A fluid transfer portion  300  capable of moving a fluid may be disposed outside the is housing  200 . The fluid transfer portion  300  may operate in a first mode for influxing or charging the light absorbing solution SL 1  into the channels CH and a second mode for outfluxing or discharging the light absorbing solution SL 1  to the outside of the channels CH. The first mode may be a process in which the light path control member LCF is switched from the wide viewing angle mode to the narrow viewing angle mode, and the second mode may be a process in which the light path control member LCF is switched from the narrow viewing angle mode to the wide viewing angle mode. Specifically, the fluid transfer portion  300  may be a pump that provides a positive pressure to the light absorbing solution SL 1  to influx or charge the light absorbing solution SL 1  into the channels CH or that provides a negative pressure to the light absorbing solution SL 1  to outflux or discharge the light absorbing solution SL 1  to the outside from the channels CH. In the wide viewing angle mode, a part of the light absorbing solution SL 1  may be disposed inside the fluid transfer portion  300 , but embodiments are not limited thereto. In the description, for descriptive convenience, the fluid transfer portion  300  including a piston  310  is illustrated, but embodiments are not limited thereto. For example, the fluid transfer portion  300  may have a different structure. 
     The connection portion  400  may be disposed between the housing  200  and the fluid transfer portion  300 . The connection portion  400  may be a pipe spatially connecting the inner space of the housing  200  to the fluid transfer portion  300 . For example, the connection portion  400  may be used for a fluid connection between the housing  200  and the fluid transfer portion  300 . For example, a material positioned inside the housing  200  and a material positioned in the fluid transfer portion  300  may move or interchange therebetween. 
     Specifically, the connection portion  400  may spatially connect the fluid transfer portion  300  to the first fluid accommodating portion  210  of the housing  200 . For example, the is connection portion  400  may be used for a fluid connection between the fluid transfer portion  300  and the first fluid accommodating portion  210  of the housing  200 . A part of the light absorbing solution SL 1  may be disposed inside the connection portion  400 , but embodiments are not limited thereto. The connection portion  400  may be, for example, a pipe having one side (e.g., one opening) connected to the first fluid accommodating portion  210  and the other side (e.g., the other opening) connected to the fluid transfer portion  300 . The connection portion  400  may be formed of substantially the same material as that of the housing cover  201 , but embodiments are not limited thereto, and may be formed of a material different from that of the housing cover  201 . When the fluid transfer portion  300  provides a positive pressure to the light absorbing solution SL 1 , the light absorbing solution SL 1  moves from the connection portion  400  toward the first fluid accommodating portion  210 , and when the fluid transfer portion  300  provides a negative pressure to the light absorbing solution SL 1 , the light absorbing solution SL 1  may move from the connection portion  400  to the fluid transfer portion  300 . 
     The light absorbing solution SL 1  may be disposed inside at least one of the housing  200 , the fluid transfer portion  300 , or the connection portion  400 . The light absorbing solution SL 1  may block transmission of the light L. In other words, the light L entering the light absorbing solution SL 1  may be blocked from proceeding by the light absorbing solution SL 1 . Accordingly, the light absorbing solution SL 1  filled in the channels CH may function as the louver LV. The light absorbing solution SL 1  may include, for example, a solution in which at least one of graphite, black pigment, black dye, black die, or carbon black is dispersed. 
     Hereinafter, a narrow viewing angle mode will be described with reference to  FIGS. 10 to 13 . In the following description, contents overlapping those described above with reference to  FIGS. 5 to 9  will be omitted for descriptive convenience. 
       FIG. 10  is a schematic diagram illustrating a modified example of a light path control member according to an embodiment.  FIG. 11  is a cross-sectional view taken along line XI-XI′ of  FIG. 10 .  FIGS. 12 and 13  are schematic views illustrating that light passes through area R of  FIG. 11 . 
     In  FIGS. 12 and 13 , the starting point of the light L, at which the light L starts to be emitted, is illustrated as the other side of the third direction Z of the housing cover  201  for descriptive convenience, but embodiments are not limited thereto, and the starting point of the light L, at which the light L starts to be emitted, may be positioned inside the display panel  100  in which the light path control member LCF is disposed. 
     Referring to  FIGS. 10 to 13 , in the light path control member LCF according to an embodiment, the light path control member LCF may form the louver LV using the light absorbing solution SL 1  in the narrow viewing angle mode. Specifically, the louver LV may be referred to as the light absorbing solution SL 1  filled in the channels CH. In the narrow viewing angle mode, the fluid transfer portion  300  may apply a positive pressure to the light absorbing solution SL 1  to completely fill the channels CH with the light absorbing solution SL 1 . In the narrow viewing angle mode, the light absorbing solution SL 1  may completely fill the first fluid accommodating portion  210  and the louver portion  220 , and may partially fill the second fluid accommodating portion  230 . As described above, the light absorbing solution SL 1  filling the channels CH of the louver portion  220  may be defined by the louver LV. 
     The louver LV may block the path of the light L. Specifically, in the narrow viewing angle mode, the louver LV may partially block a path of the light L emitted from the display panel  100  to limit an area in which the light L is visually recognized. For example, the louver LV may limit or decrease the viewing angle of the display device  1 . The light L entering the louver LV from the other side of the third direction Z of the housing  200  may be emitted to an area inclined by a maximum third angle γ from a direction perpendicular to the front surface of the housing  200 . The third angle γ may be substantially equal to half of the second angle described above. 
     When the light absorbing solution SL 1  fills the channels CH to form the louver LV in the narrow viewing angle mode, the volume of the gas AR may decrease. The gas AR may partially fill the second fluid accommodating portion  230 . In addition, the internal pressure of the gas AR may increase due to the limited space inside the housing  200 . In other words, the pressure applied by the gas AR toward the light absorbing solution SL 1  and the housing cover  201  may increase. 
     The display device  1  according to an embodiment may include the light path control member LCF having a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH, so that the viewing angle may be freely adjusted or changed according to the user&#39;s selection. 
     In addition, the light path control member LCF may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Hereinafter, another embodiment of the light path control member LCF will be described. In the description of the light path control member LFC according to another embodiment to be described later, the overlapping description of the light path control member LFC according to an embodiment will be omitted for descriptive convenience, and the following description will be focused on the differences therebetween. 
       FIG. 14  is a schematic diagram of a light path control member according to another embodiment.  FIG. 15  is a schematic diagram illustrating a modified example of the light path control member according to the embodiment of  FIG. 14 .  FIG. 14  is a diagram illustrating a light path control member in the wide viewing angle mode, and  FIG. 15  is a diagram illustrating a light path control member in the narrow viewing angle mode. 
     Referring to  FIGS. 1 and 2  in conjunction with  FIGS. 14 and 15 , a light path control member LCF_ 1  according to the embodiment is different from the light path control member LCF according to an embodiment in that it includes a housing  200 _ 1  including a plurality of partition walls PW_ 1  extending in a direction between the first direction X and the second direction Y in a plan view. In an embodiment, the partition walls PW_ 1  and the channels CH_ 1  that are inclined may be disposed in a louver portion  220 _ 1  of the housing  200 _ 1 . 
     In an embodiment, the plurality of partition walls PW_ 1  may be inclined to extend in a direction (e.g., a diagonal direction) between the first direction X and the second direction Y. For example, the extension direction of the partition walls PW_ 1  may extend in other directions that intersect the first direction X that is the extension direction of the first edge LS of the display panel  100  and that also cross the second direction Y that is the extension direction of the second edge SS. An angle in which the plurality of partition walls PW_ 1  are inclined with respect to the first direction X and the second direction Y may be about 45°, but embodiments are not limited thereto, and may be greater or less than about 45°. The plurality of partition walls PW_ 1  may extend in a direction substantially parallel to each other. Accordingly, the channels CH_ 1  defined between the partition walls PW_ 1  adjacent to each other among the plurality of partition walls PW_ 1  may also be inclined to extend in substantially the same direction as the partition walls PW  1 . 
     When the light absorbing solution SL 1  fills the channels CH_ 1  through the partition walls PW_ 1  and the channels CH_ 1  that are disposed at an inclined angle, the light path control member LCF_ 1  according to an embodiment may form the louver LV extending in substantially the same direction as the direction of the channels CH_ 1 . 
     The lengths of the partition walls PW_ 1  may be different from each other according to the positions thereof in the housing  200 _ 1 . For example, the lengths of the partition walls PW_ 1  may gradually increase as moving toward the first direction X and then gradually decrease again. Correspondingly, the lengths of the channels CH_ 1  may also be different from each other according to the positions thereof, and the lengths of the channels CH_ 1  may gradually increase as moving toward the first direction X and then gradually decrease again. 
     In the narrow viewing angle mode, the fluid transfer portion  300  may introduce the light absorbing solution SL 1  into the channels CH_ 1 . In the narrow viewing angle mode, the light absorbing solution SL 1  may fill the entirety of the channels CH_ 1  of the louver portion  220 _ 1  and the first fluid accommodating portion  210 , but the second fluid accommodating portion  230  may be partially filled. 
     The light path control member LCF_ 1  according to an embodiment may freely adjust or change the viewing angle according to the user&#39;s selection through a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH_ 1  and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH_ 1 . 
     In addition, the light path control member LCF_ 1  may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Moreover, when the light absorbing solution SL 1  fills the channels CH_ 1  through the partition walls PW_ 1  and the channels CH_ 1  that are disposed at an inclined angle, the light path control member LCF_ 1  according to an embodiment may form the louver LV extending in substantially the same direction as the direction of the channels CH_ 1 . The louver LV extending in a direction between the first direction X and the second direction Y may partially limit the path of the light L emitted to one side and the other side of the first direction X and one side and the other side of the second direction Y. For example, the light path control member LCF_ 1  according to an embodiment may limit the path of the light L emitted from the display panel  100  in the narrow viewing angle mode in various directions. 
       FIG. 16  is a schematic diagram of a light path control member according to still another embodiment.  FIG. 17  is a schematic diagram illustrating a modified example of the light path control member according to the embodiment of  FIG. 16 .  FIG. 16  is a diagram illustrating a light path control member in the wide viewing angle mode, and  FIG. 17  is a diagram illustrating a light path control member in the narrow viewing angle mode. 
     Referring to  FIGS. 16 and 17 , a light path control member LCF_ 2  according to an embodiment is different from the light path control member LCF according to an embodiment in that it includes a louver portion  220 _ 2  including a plurality of partition walls PW_ 2  disposed in a lattice shape. In other words, the partition walls PW_ 2  included in the light path control member LCF_ 2  according to an embodiment may be a sub-partition wall that is formed as any one of the partition walls PW included in the light path control member LFC according to an embodiment is divided and disposed to be spaced apart in the second direction Y. 
     In an embodiment, the plurality of partition walls PW_ 2  disposed on the louver portion  220 _ 2  may be arranged in a matrix shape in the first direction X and the second direction is Y. The plurality of partition walls PW_ 2  may be arranged to be spaced apart from each other in the first direction X, and may be arranged to be spaced apart from each other in the second direction Y. The louver portion  220 _ 2  may include a plurality of channels CH_ 2  disposed between the partition walls PW_ 2  adjacent to each other among the plurality of partition walls PW_ 2 . The channels CH_ 2  may include a first channel CH 1 _ 2  extending in the first direction X and a second channel CH 2 _ 2  extending in the second direction Y. The first channel CH 1 _ 2  may be defined between the partition walls PW_ 2  adjacent in the second direction Y among the plurality of partition walls PW_ 2  arranged in a lattice shape, and the second channel CH 2 _ 2  may be defined between the partition walls PW_ 2  adjacent in the first direction X among the plurality of partition walls PW_ 2  arranged in a lattice shape. 
     In the narrow viewing angle mode, the fluid transfer portion  300  may introduce the light absorbing solution SL 1  into the channels CH_ 2 . In the narrow viewing angle mode, the light absorbing solution SL 1  may fill the entirety of the channels CH_ 2  of the louver portion  220 _ 1  and the first fluid accommodating portion  210 , but the second fluid accommodating portion  230  may be partially filled. The light path control member LCF_ 2  according to the present embodiment may freely adjust or change the viewing angle according to the user&#39;s selection through a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH_ 2  and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH_ 2 . 
     In addition, the light path control member LCF_ 2  may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Moreover, the light path control member LCF_ 2  according to an embodiment may is partially limit the path of the light L spreading to one side and the other side of the first direction 
     X and to one side and the other side of the second direction Y among the light L emitted to one side of the third direction Z, when the light absorbing solution SL 1  fills the first channel CH 1 _ 2  and the second channel CH 2 _ 2  to form the louver LV through the plurality of partition walls PW_ 2  arranged in a lattice shape. For example, the light path control member LCF_ 2  according to an embodiment may limit the path of the light L emitted from the display panel  100  in the narrow viewing angle mode in various directions. 
     The planar shape of the partition walls PW_ 1  and PW_ 2  described above with reference to  FIGS. 14 to 17  may be equally applied to light path control members LCF_ 3 , LCF_ 4 , LCF_ 5 , LCF_ 6 , and LCF  7  to be described later with reference to  FIGS. 18 to 27 . 
       FIG. 18  is a schematic diagram of a light path control member according to still another embodiment.  FIG. 19  is a schematic diagram illustrating a modified example of the light path control member according to the embodiment of  FIG. 18 .  FIG. 18  is a diagram illustrating a light path control member in the wide viewing angle mode, and  FIG. 19  is a diagram illustrating a light path control member in the narrow viewing angle mode. 
     Referring to  FIGS. 18 and 19 , a light path control member LCF_ 3  according to an embodiment is different from the light path control member LFC according to an embodiment in that it further includes a light transmitting solution SL 2 . 
     In an embodiment, the light transmitting solution SL 2  may fill the channels CH disposed in the louver portion  220  in the wide viewing angle mode. Moreover, the light transmitting solution SL 2  may be partially disposed in the first fluid accommodating portion  210  and the second fluid accommodating portion  230 . 
       FIG. 17  illustrates the first fluid accommodating portion  210  in which the light is absorbing solution SL 1  and the light transmitting solution SL 2  are filled together, but embodiments are not limited thereto, and the first fluid accommodating portion  210  may be filled with only either the light absorbing solution SL 1  or the light transmitting solution SL 2 . On the other hand, the second fluid accommodating portion  230  may be partially filled with the light transmitting solution SL 2 , and the rest thereof may be filled with the gas AR. The gas AR may include colorless air and an inert gas. 
     The light transmitting solution SL 2  may not be immiscible with the light absorbing solution SL 1 . Here, the term “immiscible” may be referred to as that layer separation occurs without forming a homogeneous mixture with each other. For example, when the light absorbing solution SL 1  is water-soluble, the light transmitting solution SL 2  may be oil-soluble, and when the light absorbing solution SL 1  is oil-soluble, the light transmitting solution SL 2  may be water-soluble. In addition, when the light absorbing solution SL 1  is a polar solution, the light transmitting solution SL 2  may be a non-polar solution, and when the light absorbing solution SL 1  is a non-polar solution, the light transmitting solution SL 2  may be a polar solution. 
     In addition, the light transmitting solution SL 2  may have a smaller density than the light absorbing solution SL 1 . Accordingly, the light transmitting solution SL 2  may be positioned above the light absorbing solution SL 1 , and layers may be separated from each other. 
     The light transmitting solution SL 2  may have a refractive index similar to that of the partition wall PW. Specifically, the light transmitting solution SL 2  may have a refractive index difference of about 0.5 or less, about 0.3 or less, or about 0.1 or less from the partition wall PW. When the refractive index difference between the transmitting solution SL 2  and the partition wall PW is about 0.5 or less, the path of the light L emitted from the display panel  100  in the wide viewing angle mode in which the transmitting solution SL 2  fills the channels CH may not is be significantly changed at the interface between the light transmitting solution SL 2  and the partition wall PW, so that a natural image (e.g., an original image) may be displayed. 
     In addition, the light transmitting solution SL 2  may include a light transmitting material that transmits light L. The light transmitting solution SL 2  may include at least one of water, acetone, alcohol, and other transparent organic solvents, but embodiments are not limited thereto. 
     In the narrow viewing angle mode, the fluid transfer portion  300  may introduce the light absorbing solution SL 1  into the channels CH_ 2 . Accordingly, the light transmitting solution SL 2  may move to the second fluid accommodating portion  230 . In the narrow viewing angle mode, the light absorbing solution SL 1  may fill the entirety of the channels CH_ 2  of the louver portion  220 _ 1  and the first fluid accommodating portion  210 , but the second fluid accommodating portion  230  may be partially filled. In addition, the light transmitting solution SL 2  and the gas AR may be accommodated in the second fluid accommodating portion  230 . As the volume of the gas AR decreases, the internal pressure may increase. 
     The light path control member LCF_ 3  according to an embodiment may freely adjust or change the viewing angle according to the user&#39;s selection through a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH. 
     In addition, the light path control member LCF_ 3  may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Moreover, the light path control member LCF_ 3  according to an embodiment fills the channels CH at a wide viewing angle, and a natural image may be displayed because the path is of the light L emitted from the display panel  100  is not significantly changed at the interface between the light transmitting solution SL 2  and the partition walls PW through the light transmitting solution SL 2  having a refractive index difference of about 0.5 or less from the partition walls PW. 
       FIG. 20  is a schematic diagram of a light path control member according to still another embodiment.  FIG. 21  is a schematic diagram illustrating a modified example of the light path control member according to the embodiment of  FIG. 20 .  FIG. 20  is a diagram illustrating a light path control member in the wide viewing angle mode, and  FIG. 21  is a diagram illustrating a light path control member in the narrow viewing angle mode. 
     Referring to  FIGS. 20 and 21 , a light path control member LCF_ 4  according to an embodiment is different from the light path control member LCF according to an embodiment in that it further includes an auxiliary fluid transfer portion  312 _ 4  that provides a negative pressure and a positive pressure to a second fluid accommodating portion  230 _ 4  to control the movement of the gas AR, and an auxiliary connection portion  401 _ 4  that spatially connects the auxiliary fluid transfer portion  312 _ 4  to the second fluid accommodating portion  230 _ 4 . For example, the auxiliary connection portion  401 _ 4  may be used for a fluid connection between the auxiliary fluid transfer portion  312 _ 4  and the second fluid accommodating portion  230 _ 4 . In addition, in an embodiment, the second fluid accommodating portion  230 _ 4  is different from the light path control member LCF according to an embodiment in that it is opened on one side of the second direction Y and is spatially connected to the auxiliary connection portion  401 _ 4 . For example, a material positioned in the second fluid accommodating portion  230 _ 4  and a material positioned in the channels CH may move or interchange therebetween. In an embodiment, the auxiliary fluid transfer portion  312 _ 4  may provide a negative pressure to the second fluid accommodating is portion  230 _ 4  when switching from the wide viewing angle mode, which is the first mode of the fluid transfer portion  300 , to the narrow viewing angle mode, thereby removing the gas AR of the second fluid accommodating portion  230 _ 4 , and thus may assist in the process in which the light absorbing solution SL 1  fills the channels CH. For example, the light absorbing solution SL 1  may quickly fill the channels CH through the negative pressure provided by the auxiliary fluid transfer portion  312 _ 4 . 
     In addition, the auxiliary fluid transfer portion  312 _ 4  may provide a positive pressure to the second fluid accommodating portion  230 _ 4  when switching from the narrow viewing angle mode, which is the second mode of the fluid transfer portion  300 , to the wide viewing angle mode, thereby providing the gas AR to the second fluid accommodating portion  230 _ 4  and the louver portion  220 , and thus may assist in a process in which the light absorbing solution SL 1  is discharged from the channels CH. For example, the light absorbing solution SL 1  may be rapidly discharged from the channels CH through the positive pressure provided by the auxiliary fluid transfer portion  312 _ 4 . 
     The auxiliary fluid transfer portion  312 _ 4  and the auxiliary connection portion  401 _ 4  may have substantially the same configuration as the fluid transfer portion  300  and the connection portion  400 , respectively, but embodiments are not limited thereto. 
     The light path control member LCF_ 4  according to an embodiment may freely adjust or change the viewing angle according to the user&#39;s selection through a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH. 
     In addition, the light path control member LCF_ 4  may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Moreover, the light path control member LCF_ 4  according to an embodiment may assist so that the process in which the light absorbing solution SL 1  fills the channels CH through the auxiliary fluid transfer portion  312 _ 4  and the auxiliary connection portion  401 _ 4 , is made more quickly. 
       FIG. 22  is a schematic diagram of a light path control member according to still another embodiment.  FIG. 23  is a schematic diagram illustrating a modified example of the light path control member according to the embodiment of  FIG. 22 .  FIG. 22  is a diagram illustrating a light path control member in the wide viewing angle mode, and  FIG. 23  is a diagram illustrating a light path control member in the narrow viewing angle mode. 
     Referring to  FIGS. 22 and 23 , a light path control member LCF_ 5  according to an embodiment is different from the light path control member LCF_ 3  according to the embodiment described above with reference to  FIGS. 18 and 19  in that it completely fills a second fluid accommodating portion  230 _ 5  with the light transmitting solution SL 2 , and further includes an auxiliary fluid transfer portion  312 _ 5  providing a negative pressure and a positive pressure to the second fluid accommodating portion  230 _ 5 , and an auxiliary connection portion  401 _ 5  spatially connecting the auxiliary fluid transfer portion  312 _ 5  to the second fluid accommodating portion  230 _ 5 . For example, the auxiliary connection portion  401 _ 5  may be used for a fluid connection between the auxiliary fluid transfer portion  312 _ 5  and the second fluid accommodating portion  230 _ 5 . In addition, in an embodiment, the second fluid accommodating portion  230 _ 5  is different from the light path control member LCF according to an embodiment in that the second fluid accommodating portion  230 _ 5  has an opening on one side of the second direction Y and is spatially connected to the auxiliary connection portion  401 _ 5 . For example, the material is positioned in the auxiliary fluid transfer portion  312 _ 5  and the material positioned in the second fluid accommodating portion  230 _ 5  may move or interchange therebetween by the auxiliary connection portion  401 _ 5 . 
     In addition, the light path control member LCF_ 5  according to an embodiment is different from the light path control member LCF_ 4  according to the embodiment described above with reference to  FIGS. 20 and 21  in that the light transmitting solution SL 2  is disposed instead of the gas AR. 
     In the light path control member LCF_ 5  according to an embodiment, the light transmitting solution SL 2  may be filled in the channels CH of the louver portion  220  in the wide viewing angle mode, and the light absorbing solution SL 1  may be filled therein in the narrow viewing angle mode. 
     In an embodiment, the auxiliary fluid transfer portion  312 _ 5  may assist the movement to smoothly fill and discharge the light transmitting solution SL 2  and the light absorbing solution SL 1  when switching from the wide viewing angle mode, which is the first mode of the fluid transfer portion  300 , to the narrow viewing angle mode, and when switching from the narrow viewing angle mode, which is the second mode of the fluid transfer portion  300 , to the wide viewing angle mode. 
     Specifically, when switching from the wide viewing angle mode, which is the first mode of the fluid transfer portion  300 , to the narrow viewing angle mode, the light transmitting solution SL 2  filling the channels CH is discharged to the outside of the channels CH and the light absorbing solution SL 1  fills the channel CH, and at this time, the auxiliary fluid transfer portion  312 _ 5  may provide a negative pressure to suck the light transmitting solution SL 2 . Through this, it may assist that the light transmitting solution SL 2  is discharged to the outside of the channels is CH, and the light absorbing solution SL 1  fills the channels CH. 
     In addition, when switching from the narrow viewing angle mode, which is the second mode of the fluid transfer portion  300 , to the wide viewing angle mode, the light absorbing solution SL 1  filling the channels CH is discharged to the outside of the channels CH and the light transmitting solution SL 2  fills the channels CH, and at this time, the auxiliary fluid transfer portion  312 _ 5  may provide a positive pressure to push the light transmitting solution 
     SL 2  toward the channels CH. Through this, it may assist that the light absorbing solution SL 1  is discharged to the outside of the channels CH, and the light transmitting solution SL 2  fills the channels CH. 
     The light path control member LCF_ 5  according to an embodiment may freely adjust or change the viewing angle according to the user&#39;s selection through a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH. 
     In addition, the light path control member LCF_ 5  may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Moreover, the light path control member LCF_ 5  according to an embodiment may assist so that the process in which the light absorbing solution SL 1  and the light transmitting solution SL 2  fill the channels CH and are discharged from the channels CH through the auxiliary fluid transfer portion  312 _ 5  and the auxiliary connection portion  401 _ 5 , is made more quickly. 
       FIG. 24  is a schematic diagram of a light path control member according to still another embodiment.  FIG. 25  is a schematic diagram illustrating a modified example of the light path control member according to the embodiment of  FIG. 24 .  FIG. 24  is a diagram illustrating a is light path control member in the wide viewing angle mode, and  FIG. 25  is a diagram illustrating a light path control member in the narrow viewing angle mode. 
     Referring to  FIGS. 24 and 25 , a fluid transfer portion  300 _ 6  according to an embodiment is different from the light path control member LCF according to an embodiment in that it simultaneously controls not only flowing (e.g., entry and exit) of the light absorbing solution SL 1  into and out of the channels CH, but also flowing (e.g., entry and exit) of the gas 
     AR into and out of the channels CH. 
     In an embodiment, a connection portion  400 _ 6  spatially connecting a housing  200 _ 6  to the fluid transfer portion  300 _ 6  may include a first connection portion  401 _ 6  connecting the first fluid accommodating portion  210  to the fluid transfer portion  300 _ 6 , and a second connection portion  402 _ 6  connecting a second fluid accommodating portion  230 _ 6  to the fluid transfer portion  300 _ 6 . In addition, in an embodiment, the second fluid accommodating portion  230 _ 6  is different from the light path control member LCF according to an embodiment in that the second fluid accommodating portion  230 _ 6  has an opening on one side of the second direction Y and is spatially connected to the second connection portion  402 _ 6 . 
     In the wide viewing angle mode, the first fluid accommodating portion  210  may accommodate at least a part of the light absorbing solution SL 1 , and the channels CH of the louver portion  220  and the second fluid accommodating portion  230 _ 6  may accommodate the gas AR. When a piston  310 _ 6  of the fluid transfer portion  300 _ 6  moves to the other side of the second direction Y, the light absorbing solution SL 1  may fill the inside of the channels CH and the gas AR may be discharged to the outside of the channels CH. Through this, it is possible to switch from the wide viewing angle mode to the narrow viewing angle mode. 
     In the narrow viewing angle mode, the first fluid accommodating portion  210  and is the channels CH of the louver portion  220  may be filled with the light absorbing solution SL 1 . 
     The second fluid accommodating portion  230 _ 6  may accommodate a part of the light absorbing solution SL 1  and the gas AR, but embodiments are not limited thereto, and may be filled with the light absorbing solution SL 1 . When the piston  310 _ 6  of the fluid transfer portion  300 _ 6  moves to the one side of the second direction Y, the light absorbing solution SL 1  may be discharged to the outside of the channels CH and the gas AR may fill the inside of the channels CH. Through this, it is possible to switch from the narrow viewing angle mode to the wide viewing angle mode. 
     The light path control member LCF_ 6  according to an embodiment may freely adjust or change the viewing angle according to the user&#39;s selection through a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH. 
     In addition, the light path control member LCF_ 6  may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Moreover, the light path control member LCF_ 6  according to an embodiment may simultaneously control flowing (e.g., entry and exit) of the light absorbing solution SL 1  and the gas AR into and out of the channels CH through one fluid transfer portion  300 _ 6 . 
       FIG. 26  is a schematic diagram of a light path control member according to still another embodiment.  FIG. 27  is a schematic diagram illustrating a modified example of the light path control member according to the embodiment of  FIG. 26 .  FIG. 26  is a diagram illustrating a light path control member in the wide viewing angle mode, and  FIG. 27  is a diagram illustrating a light path control member in the narrow viewing angle mode. 
     Referring to  FIGS. 26 and 27 , a fluid transfer portion  300 _ 7  according to an is embodiment different from the light path control member LCF according to an embodiment in that it simultaneously controls not only flowing (e.g., entry and exit) of the light absorbing solution SL 1  into and out of the channels CH, but also flowing (e.g., entry and exit) of the light transmitting solution SL 2  into and out of the channels CH. 
     In an embodiment, a connection portion  400 _ 7  spatially connecting a housing  200 _ 7  to the fluid transfer portion  300 _ 7  may include a first connection portion  401 _ 7  connecting the first fluid accommodating portion  210  to the fluid transfer portion  300 _ 7 , and a second connection portion  402 _ 7  connecting a second fluid accommodating portion  230 _ 7  to the fluid transfer portion  300 _ 7 . In addition, in an embodiment, the second fluid accommodating portion  230 _ 7  is different from the light path control member LCF according to an embodiment in that the second fluid accommodating portion  230 _ 7  has an opening on one side of the second direction Y and is spatially connected to the second connection portion  402 _ 7 . 
     In the wide viewing angle mode, the first fluid accommodating portion  210  may accommodate at least a part of the light absorbing solution SL 1 , and the channels CH of the louver portion  220  and the second fluid accommodating portion  230 _ 7  may accommodate the light transmitting solution SL 2 . When a piston  310 _ 7  of the fluid transfer portion  300 _ 7  moves to the other side of the second direction Y, the light absorbing solution SL 1  may fill the inside of the channels CH and the light transmitting solution SL 2  may be discharged to the outside of the channels CH. Through this, it is possible to switch from the wide viewing angle mode to the narrow viewing angle mode. 
     In the narrow viewing angle mode, the first fluid accommodating portion  210  and the channels CH of the louver portion  220  may be filled with the light absorbing solution SL 1 . The second fluid accommodating portion  230 _ 7  may accommodate a part of the light absorbing is solution SL 1  and the light transmitting solution SL 2 , but embodiments are not limited thereto, and may be filled with the light absorbing solution SL 1 . When the piston  310 _ 7  of the fluid transfer portion  300 _ 7  moves to the one side of the second direction Y, the light absorbing solution SL 1  may be discharged to the outside of the channels CH and the light transmitting solution SL 2  may fill the inside of the channels CH. Through this, it is possible to switch from the narrow viewing angle mode to the wide viewing angle mode. 
     The light path control member LCF_ 7  according to an embodiment may freely adjust or change the viewing angle according to the user&#39;s selection through a wide viewing angle mode because the light absorbing solution SL 1  is disposed outside the channels CH and a narrow viewing angle mode because the light absorbing solution SL 1  is disposed inside the channels CH. 
     In addition, the light path control member LCF_ 7  may be driven through the fluid transfer portion  300  using a mechanical force, so that it is possible to easily implement the viewing angle adjustment. 
     Moreover, the light path control member LCF_ 7  according to an embodiment may simultaneously control flowing (e.g., entry and exit) of the light absorbing solution SL 1  and the light transmitting solution SL 2  into and out of the channels CH through one fluid transfer portion  300 _ 7 . 
     Although certain embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Accordingly, the inventive concepts are not limited to such embodiments, but rather to the broader scope of the appended claims and various obvious modifications and equivalent arrangements as would be apparent to a person of ordinary skill in the art.