Display device

Abstract

A display device according to an exemplary embodiment of the present disclosure includes a display panel having a display area, a back cover disposed on a rear surface of the display panel, a first roller that winds or unwinds the back cover and the display panel, and a second roller disposed above the first roller to move in a vertical direction, wherein the back cover and the display panel are overlapped on the second roller. During partial display, the emission area is flexibly adjusted to suppress the burn-in problem and improve the service life.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2020-0183010 filed in the Korean Intellectual Property Office on December 24, 2020, the disclosure of which is incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a display device, and more particularly, to a rollable display device capable of displaying an image even in a rolled state. Background Art

[0004] As display devices used for monitors of computers, televisions, mobile phones, and the like, there are organic light emitting display (OLED) devices that are self-luminous devices, liquid crystal display (LCD) devices that require a separate light source, and the like.

[0005] The application range of the display device is expanding to personal digital assistants as well as monitors of computers and televisions, and display devices having a large display area and reduced volume and weight are being studied.

[0006] In addition, recently, a rollable display device manufactured by forming a display element, a wiring line, etc. on a flexible substrate such as plastic as a flexible material so that an image can be displayed even in a rolled-up state of the display device is attracting attention as a next-generation display device. However, if a partial view function is utilized, only one end of a display panel of the display device can be used for partial display. In this case, the partial display area emits relatively bright light compared to the rest of the display panel, and thus may cause a burn-in problem. Summary of the invention

[0007] An object of the present disclosure is to provide a rollable display device that can provide partial display without causing screen burn-in problems.

[0008] The objects of the present disclosure are not limited to the above objects, and those skilled in the art can clearly understand other objects not mentioned above through the following description.

[0009] To achieve the above objectives, according to one aspect of the present disclosure, a display device includes a display panel having a display area, a back cover arranged on the rear surface of the display panel, a first roller for winding or unwinding the back cover and the display panel, and a second roller arranged above the first roller to move in a vertical direction, wherein the back cover and the display panel are overlapped on the second roller.

[0010] According to another aspect of the present disclosure, a display device includes a display panel having a display area, a back cover disposed on a rear surface of the display panel, a first roller connected to a lower end of the back cover to wind or unfold the back cover and the display panel, and a second roller disposed above the first roller to move in a vertical direction and fastened to an upper end of the back cover.

[0011] According to another aspect of the present disclosure, a display device includes: a display panel having a display area; a back cover arranged on the rear surface of the display panel; a first roller arranged in a housing unit and winding or unwinding the back cover and the display panel; a second roller arranged above the first roller to move in a vertical direction, wherein the back cover and the display panel are overlapped on the second roller; a third roller arranged in the housing unit; and an extension sheet, which is arranged at the upper end of the back cover or the rear surface of the back cover and is fastened to the third roller through the upper end of the extension sheet.

[0012] Additional details of example embodiments are included in the detailed description and accompanying drawings.

[0013] According to the present disclosure, during partial display, multiple rollers are applied to flexibly adjust the emission area, thereby suppressing the screen burn-in phenomenon to improve the service life.

[0014] The effects according to the present disclosure are not limited to the above-exemplified contents, and more various effects are included in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1A and 1B is a perspective view of a display device according to a first exemplary embodiment of the present disclosure;

[0017] Figure 2A and 2B is a schematic cross-sectional view of a display device according to a first exemplary embodiment of the present disclosure.

[0018] Figure 3 is a perspective view of a display device according to a first exemplary embodiment of the present disclosure.

[0019] Figure 4 is a rear view of the display device according to the first exemplary embodiment of the present disclosure.

[0020] Figure 5A yes Figure 4 Magnified view of area A.

[0021] Figure 5B yes Figure 4 Magnified view of area B.

[0022] Figure 5C yes Figure 2A Magnified view of area C in the middle.

[0023] Figure 6 is a plan view illustrating an example of a display unit and an extending piece of a display device according to a first exemplary embodiment of the present disclosure.

[0024] Figure 7 is a plan view illustrating another example of the display unit and the extending piece of the display device according to the first exemplary embodiment of the present disclosure.

[0025] Fig. 8A and 8B is a schematic cross-sectional view illustrating an example of partial display in the display device according to the first exemplary embodiment of the present disclosure.

[0026] Fig. 9 is a schematic cross-sectional view showing an example of a double-sided view in a display device according to a first exemplary embodiment of the present disclosure.

[0027] Fig. 10A and 10B is a schematic cross-sectional view illustrating an example of full view in the display device according to the first exemplary embodiment of the present disclosure.

[0028] Fig.11A and 11B is a perspective view of a display device according to a second exemplary embodiment of the present disclosure.

[0029] Fig. 12A and 12B is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present disclosure.

[0030] Fig.13 is a perspective view of a display device according to a third exemplary embodiment of the present disclosure.

[0031] Fig.14A and 14B is a schematic cross-sectional view of a display device according to a third exemplary embodiment of the present disclosure.

[0032] Fig.15 is a perspective view of a display device according to a third exemplary embodiment of the present disclosure.

[0033] Fig.16A is a rear view of a display device according to a third exemplary embodiment of the present disclosure.

[0034] Fig. 16B yes Fig.16Aan enlarged view of region D of; and

[0035] Fig.17A and 17B is a schematic cross-sectional view illustrating an example of partial display in a display device according to a third exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] By referring to the exemplary embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving these advantages and features will become clear. However, the present disclosure is not limited to the exemplary embodiments disclosed herein, but will be implemented in various forms. The exemplary embodiments are provided only as examples to enable those skilled in the art to fully understand the disclosure of the present disclosure and the scope of the present disclosure. Therefore, the present disclosure will only be limited by the scope of the appended claims.

[0037] The shapes, sizes, ratios, angles, quantities, etc. used to describe the exemplary embodiments of the present disclosure shown in the accompanying drawings are merely examples, and the present disclosure is not limited thereto. Throughout the specification, the same reference numerals generally represent the same elements. In addition, in the following description of the present disclosure, a detailed explanation of known related art may be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure. Terms such as "including", "having" and "consisting of..." used herein are generally intended to allow the addition of other components unless these terms are used together with the term "only". Unless otherwise expressly stated, any reference to the singular may include the plural.

[0038] Even if not explicitly stated, the components are to be construed as including ordinary margins of error.

[0039] When terms such as “on,” “above,” “below,” and “adjacent” are used to describe the positional relationship between two components, unless these terms are used together with the term “immediately” or “directly,” one or more components may be located between the two components.

[0040] When an element or layer is referred to as being “on” another element or layer, the other layer or element may be directly interposed on the other element or between them.

[0041] Although the terms "first", "second", etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components. Therefore, the first component to be mentioned below can be the second component in the technical concept of the present disclosure.

[0042] Throughout the specification, like reference numerals generally refer to like elements.

[0043] The size and thickness of each component shown in the drawings are shown for convenience of description, and the present disclosure is not limited to the size and thickness of the components shown.

[0044] The features of the various embodiments of the present disclosure may be partially or completely dependent on or combined with each other, and may be technically interlocked and operated in various ways, and the embodiments may be implemented independently of each other or in relation to each other.

[0045] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0046] <Display device—Rollable display device>.

[0047] A rollable display device may also be referred to as a display device that can display an image even if the display device is rolled up. Compared with a general display device of the prior art, a rollable display device may have higher flexibility. Depending on whether the rollable display device is used, the shape of the rollable display device may be freely changed. Specifically, when the rollable display device is not used, the rollable display device is rolled up for storage in a reduced volume. On the contrary, when the rollable display device is used, the rolled up rollable display device is unfolded for use.

[0048] Figure 1A and 1B is a perspective view of a display device according to a first exemplary embodiment of the present disclosure.

[0049] refer to Figure 1A and 1B , the display device 100 according to the first exemplary embodiment of the present disclosure may include a display unit DP and a housing unit HP.

[0050] The display unit DP is a configuration for displaying an image to a user, and, for example, a display element and a circuit, a wiring line, a component, and the like for driving the display element may be provided in the display unit DP.

[0051] Since the display device 100 according to the first exemplary embodiment of the present disclosure is a rollable display device 100, the display unit DP may be configured to be rolled and unfolded. For example, the display unit DP according to the first exemplary embodiment of the present disclosure may be formed of a display panel 120 and a back cover 110, each of which has flexibility so as to be rolled or unfolded. Figure 6 and Figure 7 The display unit DP is described in more detail.

[0052] Meanwhile, the display device 100 according to the first exemplary embodiment of the present disclosure may perform partial display, that is, only a partial area of ​​the display panel 120 emits light to be used as a display area.

[0053] To this end, the display device 100 according to the first exemplary embodiment of the present disclosure includes a second roller 151b and a third roller (not shown) in addition to the main roller, ie, the first roller (not shown). However, it is not limited thereto, and the display device may not include the third roller.

[0054] In addition, an extending piece 115 extending from the display unit DP may be provided on the rear surface of the display unit DP to be fastened with the third roller.

[0055] The housing unit HP is a shell that accommodates the display unit DP. Specifically, the display unit DP, the extension piece 115, and the second roller 151b may be accommodated in the housing unit HP. The housing unit HP may have an opening HPO through which the display unit DP, the extension piece 115, and the second roller 151b move to the inside and outside of the housing unit HP. The display unit DP, the extension piece 115, and the second roller 151b may move in the vertical direction through the opening HPO of the housing unit HP. At this time, according to the first exemplary embodiment of the present disclosure, one opening HPO is provided, but it is not limited thereto, and thus two openings may be provided to allow the display unit DP and the extension piece 115 to move in the vertical direction, respectively.

[0056] The display unit DP of the display device 100 may be switched from a fully extended state to a fully rolled state or from a fully rolled state to a fully extended state.

[0057] Figure 1A The display unit DP of the display device 100 is shown as an example being fully unfolded, and in the fully unfolded state, the display unit DP of the display device 100 is disposed outside the housing unit HP. That is, in order for the user to view an image through the display device 100, when the display unit DP is unfolded to be disposed outside the housing unit HP as much as possible and cannot be further unfolded, it can be defined as a fully unfolded state.

[0058] Figure 1B The display unit DP of the display device 100 is shown as an example being fully rolled up, and in the fully rolled up state, the display unit DP of the display device 100 is contained in the housing unit HP and cannot be further rolled up. That is, when the user does not view an image through the display device 100, it is advantageous from the perspective of appearance that the display unit DP, the extension sheet 115, and the second roller 151b are not disposed outside the housing unit HP. Therefore, when the display unit DP, the extension sheet 115, and the second roller 151b are contained in the housing unit HP, it is defined as a fully rolled up state. However, it is not limited thereto, and therefore, when two openings are provided, the second roller 151b may be disposed outside the housing unit HP.

[0059] In order to switch the display unit DP to the fully extended state or the fully rolled state, a driving unit that rolls or extends the display unit DP may be provided.

[0060] <Driver unit>

[0061] Figure 2A and 2B is a schematic cross-sectional view of a display device according to a first exemplary embodiment of the present disclosure.

[0062] Figure 3 is a perspective view of a display device according to a first exemplary embodiment of the present disclosure.

[0063] Figure 4 is a rear view of the display device according to the first exemplary embodiment of the present disclosure.

[0064] Figure 5A yes Figure 4 Magnified view of area A.

[0065] Figure 5B yes Figure 4 Magnified view of area B.

[0066] Figure 5C yes Figure 2A Magnified view of area C.

[0067] Figure 2A and 2B 1 is a schematic cross-sectional view for explaining the first roller 151a, the second roller 151b, and the third roller 151c in the display device 100 according to the first exemplary embodiment of the present disclosure. However, the present disclosure is not limited to Figure 2A and 2B The structure shown in .

[0068] For the convenience of description, Figure 3 In the embodiment, the configuration of the drive unit and the housing unit HP is omitted, and Figure 4 , the extending piece 115 and the third roller 151c are omitted to show the configuration of the driving unit.

[0069] refer to Figures 2A to 4 , the display unit DP may include a back cover 110 , a display panel 120 , a flexible film 130 , and a printed circuit board 140 .

[0070] In addition, the display unit DP may further include a cover unit 170 that covers and protects the printed circuit board 140 .

[0071] In addition, the driving unit for driving the display unit DP may be configured to include a roller unit 150 and a lifting unit 160 .

[0072] The roller unit 150 may include a first roller 151 a , a roller supporting unit 152 , and a first rotating shaft 153 .

[0073] The roller unit 150 may rotate the first roller 151 a in the first direction DR1 or the second direction DR2 , and may roll or unroll the display unit DP fixed to the roller unit 150 .

[0074] The roller unit 150 may be provided in the housing unit HP.

[0075] The first roller 151 a may include the source printed circuit board 145 therein, but is not limited thereto.

[0076] The first roller 151a is a member around which the display unit DP is wound. The first roller 151a may be formed to have a cylindrical shape, for example. Figure 3 , the first roller 151a of the present disclosure has a D-cut shape in which a portion of a cylindrical shape has a flat shape, but is not limited thereto.

[0077] The lower edge of the display unit DP may be fixed to the first roller 151a. For example, a screw passes through the second fastening hole AH2 of the back cover 110 so that the lower edge of the back cover 110 may be fastened to the first roller 151a, but is not limited thereto.

[0078] When the first roller 151a rotates in the first direction DR1 (i.e., counterclockwise), the display unit DP fixed to the first roller 151a through the lower edge of the rear cover can be rolled around the first roller 151a. In contrast, when the first roller 151a rotates in the second direction DR2 (i.e., clockwise) in the opposite direction, the display unit DP rolled around the first roller 151a can be unrolled from the first roller 151a. The first roller 151a can be formed of a metal material or a plastic material having rigidity.

[0079] The driving unit according to the first exemplary embodiment of the present disclosure may further include a second roller 151 b and a third roller 151 c .

[0080] When only one first roller 151a is provided in the housing unit HP, if the partial display function is used, a specific portion of the display panel 120, that is, only one end of the display panel 120 may be used for partial display. In this case, the partial display area emits relatively bright light compared to the rest of the display panel 120, thus possibly causing a burn-in problem.

[0081] Therefore, in the first exemplary embodiment of the present disclosure, in addition to the first roller 151a, the second roller 151b is provided to move to the outside and inside of the housing unit HP, and the third roller 151c is provided in the housing unit HP. That is, according to the first exemplary embodiment of the present disclosure, in order to drive the display unit DP, three rollers including the first roller 151a, the second roller 151b and the third roller 151c, two motors including the first motor 180 and the second motor 190, and one torsion spring 155 may be provided.

[0082] The position of the emission area of ​​the display panel 120 can be flexibly adjusted by the vertical movement of the second roller 151b and the rolling of the third roller 151c, so that partial display can be achieved without causing a burn-in problem.

[0083] The display unit DP and / or the extending sheet 115 are overlapped on the second roller 151 b , and one end of the extending sheet 115 may be fastened with the third roller 151 c .

[0084] The third roller 151c is connected to the second motor 190 so as to be rotatably driven, but is not limited thereto. In order to simplify driving or equipment, the third roller 151c may use a spring instead of the second motor 190.

[0085] As described above, the position of the emission area of ​​the display panel 120 may be adjusted according to the rotation state of the first roller 151 a , the lifting height of the second roller 151 b , and the rotation state of the third roller 151 c .

[0086] Specifically, refer to Figure 5A , the roller supporting unit 152 may support the first roller 151 a at both sides of the first roller 151 a.

[0087] Specifically, the roller support unit 152 may be disposed on the bottom surface HPF of the housing unit HP. The side surface of the roller support unit 152 may be coupled to both ends of the first roller 151a. Therefore, the roller support unit 152 allows the first roller 151a to be rotatably coupled to the roller support unit 152 so as to be spaced apart from the bottom surface HPF of the housing unit HP. Therefore, the first roller 151a may rotate around the first rotation axis 153 in the first direction DR1 or the second direction DR2. The rolling of the first roller 151a may be performed by a torsion spring 155 installed in the first roller 151a.

[0088] The torsion spring 155 is wound around the first rotating shaft 153 so as to be installed in the first roller 151 a , but is not limited thereto. The torsion spring 155 always pulls the display unit DP downward, and the display unit DP is pushed upward by the driving of the first motor 180 .

[0089] That is, the driving unit may further include a first motor 180 and a driving shaft 181 .

[0090] The first motor 180 may include a gear box, but is not limited thereto.

[0091] The driving force of the first motor 180 may be transmitted to the lifting unit 160 through the driving shaft 181. The plurality of links 162L of the lifting unit 160 are extended upward by the driving of the first motor 180 to push the second roller 151b fastened to the roller lifting member 161 of the lifting unit 160, and thus, the display unit DP may be driven upward.

[0092] That is, the lifting unit 160 moves the display unit DP in the vertical direction according to the driving of the roller unit 150. The lifting unit 160 may include a plurality of links 162L hinged to each other and a roller lifting member 161 fixed to one end of the link 162L. Each of the plurality of links 162L is rotatably hinged to each other so as to be lifted and lowered in the vertical direction by the driving of the first motor 180. When the plurality of links 162L moves in the vertical direction, each of the plurality of links 162L may rotate so as to be away from or close to each other.

[0093] Reference together Figure 5B , one end of the roller lifting member 161 is fixedly coupled to one end of the connecting rod 162L, and the other end may be rotatably fastened to the fastening unit 164 connected to the second rotating shaft 163. The roller lifting member 161 and the connecting rod 162L may form a predetermined angle so that the connecting rod 162L is not visible from the front surface of the display device 100, but is not limited thereto. The length of the roller lifting member 161 may be set to accommodate the roller lifting member 161 in the housing unit HP.

[0094] The second roller 151b is axially coupled to the second rotating shaft 163, and the second rotating shaft 163 may be rotatably fastened with the fastening unit 164. The roller lifting member 161 may be rotatably fastened with the fastening unit 164 through the hinge rotating sleeve 165, but is not limited thereto. Therefore, the roller lifting member 161 is lifted or lowered to lift or lower the second roller 151b fastened with the fastening unit 164. By doing so, the display unit DP may be lifted or lowered.

[0095] At the same time, refer to Figure 5C , the third roller 151c may be rotated by the driving of the second motor 190. The third roller 151c may be connected to the second motor 190 by gears 191 and 192 so as to be rotated. The extension sheet 115 may be wound around or unwound from the third roller 151c by the rotation of the third roller 151c, and thus the emission area of ​​the display unit DP may be adjusted.

[0096] In some exemplary embodiments, a driving unit having a structure other than the above-described driving unit may be applied to the display device 100. That is, as long as the display unit DP is rolled and unrolled, the configurations of the above-described roller unit 150 and the lifting unit 160 may be modified, some configurations may be omitted, or another configuration may be added.

[0097] Below, you can refer to Figure 6 and Figure 7 The display unit DP and the extending sheet 115 are described together in more detail.

[0098] <Display Unit>

[0099] Figure 6 is a plan view illustrating an example of a display unit and an extending piece of a display device according to a first exemplary embodiment of the present disclosure.

[0100] Figure 7 is a plan view illustrating another example of the display unit and the extending piece of the display device according to the first exemplary embodiment of the present disclosure.

[0101] refer to Figure 6 or Figure 7 , the display unit DP may include a back cover 110 , 110 ′, a display panel 120 , a flexible film 130 , and a printed circuit board 140 .

[0102] The display panel 120 is a panel for displaying images to a user.

[0103] The display panel 120 may include a display element for displaying an image, a driving element for driving the display element, a wiring line for transmitting various signals to the display element and the driving element, etc. The display element may be defined in different ways according to the type of the display panel 120. For example, when the display panel 120 is an organic light-emitting display panel, the display element may be an organic light-emitting diode including an anode, an organic light-emitting layer, and a cathode. For example, when the display panel 120 is a liquid crystal display panel, the display element may be a liquid crystal display element. In the following, even if it is assumed that the display panel 120 is an organic light-emitting display panel, the display panel 120 is not limited to an organic light-emitting display panel.

[0104] In addition, since the display device 100 according to the first exemplary embodiment of the present disclosure is a rollable display device, the display panel 120 may be implemented as a flexible display panel so as to be rolled around the roller 151 or unrolled from the first roller 151 a .

[0105] The display panel 120 may include a display area AA and a non-display area NA.

[0106] The display area AA is an area of ​​the display panel 120 where an image is displayed.

[0107] In the display area AA, a plurality of sub-pixels constituting a plurality of pixels and a circuit for driving the plurality of sub-pixels may be provided. The plurality of sub-pixels are the smallest units constituting the display area AA, and a display element may be provided in each of the plurality of sub-pixels. A plurality of sub-pixels may constitute one pixel. For example, an organic light emitting diode including an anode, an organic light emitting layer, and a cathode may be provided in each of the plurality of sub-pixels, but is not limited thereto. In addition, the circuit for driving the plurality of sub-pixels may include a driving element, a wiring line, and the like. For example, the circuit may be composed of a thin film transistor, a storage capacitor, a gate line, a data line, and the like, but is not limited thereto.

[0108] The non-display area NA is an area where no image is displayed.

[0109] In the non-display area NA, various wiring lines and circuits for driving the organic light emitting diodes of the display area AA are provided. For example, in the non-display area NA, connection lines for transmitting signals to a plurality of sub-pixels and circuits of the display area AA, a driver IC (e.g., a gate driver IC or a data driver IC), etc. may be provided, but are not limited thereto.

[0110] The flexible film 130 is a film in which various components are disposed on a base film having ductility. Specifically, the flexible film 130 is a film that provides signals to a plurality of sub-pixels and circuits of the display area AA and is electrically connected to the display panel 120. The flexible film 130 is disposed at one end of the non-display area NA of the display panel 120 to provide a power supply voltage, a data voltage, etc. to a plurality of sub-pixels and circuits of the display area AA. Figure 6 and 7 Four flexible films 130 are shown in FIG. 1 , but the number of the flexible films 130 may vary according to the design and is not limited thereto.

[0111] Meanwhile, for example, a driver IC such as a gate driver IC or a data driver IC may be provided on the flexible film 130. The driver IC is a component that processes data for displaying an image and a driving signal for processing the data. Depending on the mounting method, the driver IC may be provided by a chip on glass (COG), a chip on film (COF), a tape carrier package (TCP), etc. However, for the convenience of description, it is described that the driver IC is mounted on the flexible film 130 by a chip on film method, but is not limited thereto.

[0112] The printed circuit board 140 is disposed at one end of the flexible film 130 so as to be connected to the flexible film 130. The printed circuit board 140 is a component that provides a signal to the driver IC. The printed circuit board 140 may provide various signals such as a drive signal or a data signal to the driver IC. For example, a data driver that generates a data signal may be installed in the printed circuit board 140, and the generated data signal may be provided to a plurality of sub-pixels and circuits of the display panel 120 through the flexible film 130. Although in Figure 6 and 7 One printed circuit board 140 is shown in FIG. 1 , but the number of printed circuit boards 140 may vary according to design and is not limited thereto.

[0113] The back cover 110, 110' is disposed on the rear surface of the display panel 120, the flexible film 130 and the printed circuit board 140 to support the display panel 120, the flexible film 130 and the printed circuit board 140. Therefore, the size of the back cover 110, 110' can be larger than the size of the display panel 120. Therefore, the back cover 110, 110' can protect other configurations of the display unit DP from the outside. Even if the back cover 110, 110' is formed by a material having rigidity, at least a portion of the back cover 110, 110' may also be flexible so as to be rolled or unfolded together with the display panel 120. For example, the back cover 110, 110' may be formed by a metal material such as stainless steel SUS or invar, plastic, etc. However, as long as the material of the back cover 110, 110' satisfies physical conditions such as thermal strain, radius of curvature and rigidity, various materials may be used, and are not limited thereto.

[0114] Meanwhile, the back cover 110 , 110 ′ may include a plurality of openings 111 .

[0115] The plurality of openings 111 may allow the back cover 110 , 110 ′ to have flexibility. The plurality of openings 111 may be flexibly deformed and allow the back cover 110 , 110 ′ to be rolled around the first roll 151 a or unrolled from the first roll 151 a together with the display panel 120 .

[0116] The back cover 110, 110' may include a plurality of support areas PA and a plurality of stretchable areas MA. The plurality of support areas PA are areas where the plurality of openings 111 are not provided, and the plurality of stretchable areas MA are areas where the plurality of openings 111 are provided. Figure 6 In the back cover 110, a first support area PA1, a first extensible area MA1, a third support area PA3, a second extensible area MA2, and a second support area PA2 are sequentially provided from the uppermost end of the back cover 110. However, the present disclosure is not limited thereto and refers to Figure 7In the back cover 110', a first support area PA1, a first extensible area MA1 and a third support area PA3 may be sequentially provided from the uppermost end of the back cover 110'. Figure 6 The back cover 110, however, the same configuration can be applied in the same manner to Figure 7 The back cover 110'.

[0117] The first support area PA1 of the rear cover 110 is the uppermost area of ​​the rear cover 110 and is fastened to the extension piece 115. The first fastening hole AH1 may be formed in the first support area PA1 to be fastened to the extension piece 115, and the fourth fastening hole AH4 may be formed in the corresponding extension piece 115. For example, the display unit DP and the extension piece 115 may be fastened to each other by a fixing member passing through the first fastening hole AH1 and the fourth fastening hole AH4. However, it is not limited thereto and as Figure 7 As shown, the display unit DP and the extending sheet 115 may be fastened by other configurations, such as an adhesive layer or an adhesive tape.

[0118] In addition, the first extendable area MA1 is an area extending from the first supporting area PA1 toward the lower side of the back cover 110. The first extendable area MA1 is an area in which the plurality of openings 111 are provided and to which the display panel 120 is attached.

[0119] The third supporting area PA3 is an area extending from the first extensible area MA1 toward the lower side of the back cover 110. The flexible film 130 connected to one end of the display panel 120 and the printed circuit board 140 may be disposed in the third supporting area PA3.

[0120] In order to protect the flexible film 130 and the printed circuit board 140, the third supporting area PA3 may support the flexible film 130 and the printed circuit board 140 so as to be rolled around the first roller 151a in a flat shape rather than in an arc shape. A portion of the first roller 151a may be formed flat, corresponding to the third supporting area PA3, but is not limited thereto.

[0121] The second extensible area MA2 is an area extending from the third supporting area PA3 toward the lower side of the back cover 110. A plurality of openings 111 may be provided in the second extensible area MA2.

[0122] The second stretchable area MA2 extends to set the display area AA of the display panel 120 outside the housing unit HP. For example, when the back cover 110 and the display panel 120 are fully unfolded, the second support area PA2 to the third support area PA3 of the back cover 110 fixed to the first roller 151a may be set inside the housing unit HP. The first stretchable area MA1 and the first support area PA1 to which the display panel 120 is attached may be set outside the housing unit HP.

[0123] The second support area PA2 of the back cover 110 is the lowermost area of ​​the back cover 110 and may be fastened to the first roller 151a. The second support area PA2 may include a second fastening hole AH2 so as to be fastened to the first roller 151a. For example, the first roller 151a and the second support area PA2 of the back cover 110 may be fastened to each other by screws passing through the first roller 151a and the second fastening hole AH2. Since the second support area PA2 is fastened to the first roller 151a, the back cover 110 may be rolled around or unrolled from the first roller 151a by the rotation of the first roller 151a. However, the present disclosure is not limited thereto, and reference is made to Figure 7 , a fourth fastening hole AH4 may be formed at a lower end of the extension piece 115' to be fastened with the first roller 151a. For example, the first roller 151a and the extension piece 115' may be fastened to each other by a screw passing through the first roller 151a and the fourth fastening hole AH4.

[0124] Meanwhile, the extending sheets 115 , 115 ′ of the present disclosure may be disposed above the display unit DP or on the rear surface of the back cover 110 .

[0125] refer to Figure 6 , the extending piece 115 may be connected to the upper end of the display unit DP.

[0126] That is, as described above, at least one fourth fastening hole AH4 may be provided at the lower end of the extending piece 115. The back cover 110 and the extending piece 115 may be fastened to each other by screws passing through the first fastening hole AH1 and the fourth fastening hole AH4.

[0127] At least one fifth fastening hole AH5 may be formed at the upper end of the extending piece 115. For example, the third roller 151c and the extending piece 115 may be fastened to each other by a screw passing through the third roller 151c and the fifth fastening hole AH5.

[0128] The extending sheet 115 may be made of a plastic material such as polyethylene terephthalate (PET), but is not limited thereto.

[0129] In contrast, reference Figure 7, the back cover 110' may be attached to the extension piece 115'. In this case, the back cover 110' may not include the second extensible region and the second supporting region, and the first fastening hole may not be provided in the first supporting region PA1 of the back cover 110', but is not limited thereto.

[0130] The extending sheet 115 ′ covers the display unit DP and may extend to the upper and lower parts.

[0131] At least one fifth fastening hole AH5 may be formed at the upper end of the extension piece 115'. For example, the third roller 151c and the extension piece 115' may be fastened to each other by a screw passing through the third roller 151c and the fifth fastening hole AH5.

[0132] The extending piece 115 ′ may be made of a plastic material such as polyethylene terephthalate PET, but is not limited thereto.

[0133] Hereinafter, a display method of the display device configured as described above, such as full display or partial display, may be described in more detail.

[0134] <Display method>

[0135] Fig. 8A and 8B is a schematic cross-sectional view illustrating an example of partial display in the display device according to the first exemplary embodiment of the present disclosure.

[0136] Fig. 8A and Figure 8B The reference symbol A shown in FIG. 1 represents the upper end of the display area of ​​the display panel. Fig. 8A and Figure 8B In the screen shown in the on state, a signal is applied to the display panel to display an image, and in the screen in the off state, a signal is not applied to the corresponding display panel so that no image is displayed.

[0137] Fig. 8A The basic types of partial displays are shown as examples, and Figure 8B A modified shape of a partial display in which a viewing area is moved is shown. Here, the viewing area refers to the display area of ​​the screen in the turned-on state.

[0138] refer to Fig. 8A , in the display device according to the first exemplary embodiment of the present disclosure, the first motor may lift the display unit DP and the second motor 190 may curl the extending sheet 115 .

[0139] The first and second motors 190 are controlled to elevate and lower the display unit DP and change the viewing area.

[0140] The first motor is driven to elevate the elevating unit, and the second motor 190 is driven to wind the extending sheet 115 around the third roller 151 c so as to elevate and lower the display unit DP.

[0141] At this time, when the first motor is turned off, the total height of the viewing area is constantly maintained, and the corresponding display area is driven (turned on) to view an image.

[0142] At the same time, reference Figure 8B , when the second motor 190 is driven in this state, the viewing area can be changed. That is, the second motor 190 is driven to roll the third roller 151c so that the extension sheet 115 is wound around the third roller 151c or unrolled from the third roller 151c, and thus the viewing area can be moved and the emission area can be flexibly adjusted. Therefore, the screen burn-in phenomenon is suppressed to improve the service life.

[0143] Meanwhile, according to the present disclosure, an image may be viewed not only on the front surface of the display device but also on the rear surface of the display device, which will be described in more detail with reference to the accompanying drawings.

[0144] Fig. 9 is a schematic cross-sectional view illustrating double-sided display in the display device according to the first exemplary embodiment of the present disclosure as an example.

[0145] Fig. 9 The display device and Fig. 8A and Figure 8B The only difference between the display devices is the driving of the display area, but the other configurations are substantially the same, so redundant descriptions will be omitted. The same configurations will be denoted by the same reference numerals.

[0146] Fig. 9 The reference symbol A shown in represents the upper end of the display area of ​​the display panel. Fig. 9 The screen shown in the on state indicates that a signal is applied to the corresponding display panel to display an image.

[0147] refer to Fig. 9 , the first motor is driven to elevate the elevating unit, and the second motor 190 is driven to wind the extending sheet 115 around the third roller 151 c to elevate and lower the display unit DP.

[0148] In this case, the extending sheet 115 is sufficiently rolled around the third roller 151 c so that the upper end A of the display area may be disposed close to the third roller 151 c.

[0149] When the first motor is turned off, the total height of the viewing area is kept constant, and the corresponding display area is driven (turned on) to view the image. Therefore, the display area is located not only on the front surface of the display device, but also on the rear surface, so that the two display areas are driven (turned on) to view the images on both sides at the same time.

[0150] At this time, the total height of the viewing area can be adjusted by driving the first motor.

[0151] Fig. 10A and Fig. 10B is a schematic cross-sectional view illustrating an example of full display in the display device according to the first exemplary embodiment of the present disclosure.

[0152] Fig. 10A and Fig. 10B The display device and Fig. 8A and Figure 8B The only difference between the display devices is the total height of the viewing area, but the other configurations are substantially the same, so redundant descriptions will be omitted. The same configurations will be denoted by the same reference numerals.

[0153] Fig. 10A and Fig. 10B Reference characters A and B shown in illustrative figures respectively denote the upper end and the lower end of the display area of ​​the display panel.

[0154] Fig. 10A shows the basic type of comprehensive display as an example, Fig. 10B A modified shape of the overall display is shown in which the viewing area moves.

[0155] refer to Fig. 10A ,like Fig. 8A As shown, the first motor is driven to elevate the elevating unit, and the second motor 190 is driven to wind the extending sheet 115 around the third roller 151 c to elevate and lower the display unit DP.

[0156] At this time, the display unit DP is raised to the maximum to expose the entire display area (from Fig. 10A from A to B).

[0157] In this state, when the first motor is turned off, the total height of the viewing area is kept constant, and the corresponding display area is driven (turned on) so that the image can be viewed in the entire display area. For example, the area from the upper end A to the lower end B of the display area is the actual viewing area, and the aspect ratio is 16:9.

[0158] At the same time, reference Fig. 10B, the first motor and the second motor 190 are driven to change the height of the second roller 151b and the viewing area. That is, the first motor is driven to lower the height of the second roller 151b, and the second motor 190 is driven to roll the third roller 151c, so that the extension sheet 115 is wound around the third roller 151c to adjust the entire display area to be used as the actual viewing area. Therefore, the unnecessary area is closed to improve the service life of the screen.

[0159] According to the first exemplary embodiment of the present disclosure, the housing unit includes one opening, but is not limited thereto, and thus two openings are provided to allow the display unit and the extension piece to move in vertical directions, respectively, which will be described in more detail with reference to the second exemplary embodiment of the present disclosure.

[0160] <Second Embodiment>

[0161] Fig.11A and 11B is a perspective view of a display device according to a second exemplary embodiment of the present disclosure.

[0162] Fig. 12A and 12B is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present disclosure.

[0163] Fig.11A , 11B , 12A and 12B of the display device 200 according to the second exemplary embodiment of the present disclosure and Figure 1A , 1B The only difference between the display devices 100 of 2A and 2B is the configuration of the openings HP01 and HP02 of the housing unit HP. However, the other configurations are substantially the same, so redundant descriptions will be omitted. The same configurations will be denoted by the same reference numerals.

[0164] refer to Fig.11A , 11B , 12A and 12B, the display device 200 according to the second exemplary embodiment of the present disclosure may include a display unit DP and a housing unit HP.

[0165] The display device 200 according to the second exemplary embodiment of the present disclosure includes a second roller 151b and a third roller 151c in addition to the main roller, ie, the first roller 151a. However, it is not limited thereto, and the display device may not include the third roller 151c.

[0166] At this time, the display device 200 according to the second exemplary embodiment of the present disclosure includes two openings so that the display unit DP and the extending piece 115 are moved in vertical directions, respectively.

[0167] That is, the opening according to the second exemplary embodiment of the present disclosure may include a first opening HPO1 through which the display unit DP moves in a vertical direction and a second opening HPO2 through which the extending piece 115 moves in the vertical direction.

[0168] In this case, if Fig. 12B As shown, the extension piece 115 and a portion of the driving unit including the second roller 151b may be located outside the housing unit HP. In addition, according to the second exemplary embodiment of the present disclosure, the movement of the display unit DP and the extension piece 115 is guided by the first opening HPO1 and the second opening HPO2, so that the driving can be performed more smoothly.

[0169] Meanwhile, in the first and second exemplary embodiments of the present disclosure, three rollers are provided, but not limited thereto, so the third roller is omitted and only two rollers may be provided, which will be described in detail with reference to the third exemplary embodiment of the present invention.

[0170] <Third Embodiment>

[0171] Fig.13 is a perspective view of a display device according to a third exemplary embodiment of the present disclosure.

[0172] Fig.14A and 14B is a schematic cross-sectional view of a display device according to a third exemplary embodiment of the present disclosure.

[0173] Fig.15 is a perspective view of a display device according to a third exemplary embodiment of the present disclosure.

[0174] Fig.16A is a rear view of a display device according to a third exemplary embodiment of the present disclosure.

[0175] Fig. 16B yes Fig.16A Magnified view of area D.

[0176] Fig.17A and 17B is a schematic cross-sectional view illustrating an example of partial display in a display device according to a third exemplary embodiment of the present disclosure.

[0177] Figures 13 to 17A and the display device 300 of 17B and Figure 1A and 1B to Fig. 10A and 10B The only difference between the display devices 100 is the configuration of the rollers 351a and 351b, but the other configurations are substantially the same, so redundant description will be omitted. The same configurations will be denoted by the same reference numerals.

[0178] Fig.14A and 14B 3 is a schematic cross-sectional view for explaining a first roller 351a and a second roller 315b in a display device 300 according to a third exemplary embodiment of the present disclosure. However, the present disclosure is not limited to Fig.14A and Fig. 14B The structure shown.

[0179] In addition, for the convenience of description, Fig.15 The configuration of the drive unit and the housing unit is omitted.

[0180] refer to Figures 13 to 16A and Fig. 16B , the display device 300 according to the third exemplary embodiment of the present disclosure may include a display unit DP and a housing unit HP.

[0181] The display unit DP is a configuration for displaying an image to a user, and may be formed of a display panel 120 and a back cover 110 , each of which has flexibility so as to be rolled or unrolled.

[0182] The display unit DP may include a back cover 110 , a display panel 120 , a flexible film 130 , and a printed circuit board 140 .

[0183] Meanwhile, the display device 300 according to the third exemplary embodiment of the present disclosure may perform partial display, that is, only a partial area of ​​the display panel 120 emits light to be used as a display area.

[0184] To this end, the display device 300 according to the third exemplary embodiment of the present disclosure includes a second roller 351 b in addition to the main roller (ie, the first roller 351 a ).

[0185] The housing unit HP is a casing in which the display unit DP is accommodated.

[0186] The housing unit HP may have an opening HPO through which the display unit DP and the second roller 351 b move to the inside and outside of the housing unit HP.

[0187] As described above, the display unit DP may include the back cover 110 , the display panel 120 , the flexible film 130 , and the printed circuit board 140 .

[0188] In addition, the driving unit for driving the display unit DP may be configured to include a roller unit 350 and a lifting unit 160 .

[0189] The roller unit 350 may include a first roller 351 a , a roller supporting unit 352 , and a first rotating shaft 353 .

[0190] The roller unit 350 may be disposed within the housing unit HP.

[0191] The first roller 351 a may include the source printed circuit board 145 therein, but is not limited thereto.

[0192] The first roller 351a is a member around which the display unit DP is wound. For example, the first roller 351a may be formed to have a cylindrical shape. Fig.15 , the first roller 351a of the present disclosure has a D-cut shape in which a portion of a cylindrical shape has a flat shape, but is not limited thereto.

[0193] The lower edge of the back cover 110 may be fixed to the first roller 351a. For example, a screw passes through the second fastening hole AH2 so that the lower edge of the back cover 110 may be fastened to the first roller 351a, but is not limited thereto.

[0194] The roller support unit 352 may support the first roller 351a at both sides of the first roller 351a. Specifically, the roller support unit 352 may be disposed on the bottom surface HPF of the housing unit HP. The side surfaces of the roller support unit 352 may be coupled to both ends of the first roller 351a. The first roller 351a may be rotatably coupled to the roller support unit 352. Therefore, the first roller 351a may rotate around the first rotation axis 353 in the first direction DR1 or the second direction DR2.

[0195] The first roller 351a may be rotated by the driving of the second motor 390. The first roller 351a is connected to the second motor 390 through a gear (not shown) to rotate, but is not limited thereto. The display unit DP may be rolled or unrolled by the rotation of the first roller 351a.

[0196] At this time, when the first roller 351a rotates in the first direction DR1 (i.e., counterclockwise), the rear cover 110 fixed to the first roller 351a by the lower edge can be rolled around the first roller 351a. In contrast, when the first roller 351a rotates in the second direction DR2 (i.e., clockwise) in the opposite direction, the rear cover 110 rolled around the first roller 351a can be unrolled from the first roller 351a.

[0197] The driving unit of the third exemplary embodiment of the present disclosure may further include a second roller 351 b .

[0198] In addition to the first roller 351a, the third exemplary embodiment of the present disclosure further includes a second roller 351b, and the second roller 351b is configured to move to the outside and inside of the housing unit HP. That is, according to the third exemplary embodiment of the present disclosure, in order to drive the display unit DP, two rollers including the first roller 351a and the second roller 351b, two motors including the first motor 180 and the second motor 390, and a torsion spring 355 installed in the second roller 351b may be provided.

[0199] The position of the emission area of ​​the display panel 120 may be flexibly adjusted by the vertical movement of the second roller 351 b and the curling of the display unit DP by the torsion spring 355 , so that partial display is achieved without causing a burn-in problem.

[0200] The display unit DP may be rolled around the second roller 351 b .

[0201] As described above, the position of the emission area of ​​the display panel 120 may be adjusted according to the rotation state of the first roller 351 a and the lifting height of the second roller 351 b .

[0202] The driving unit may further include a first motor 180 and a driving shaft 181 .

[0203] The first motor 180 may include a gear box, but is not limited thereto.

[0204] The driving of the first motor 180 may be transmitted to the lifting unit 160 through the driving shaft 181. The plurality of connecting rods 162L of the lifting unit 160 are extended upward by the driving of the first motor 180 to push the second roller 351b fastened to the roller lifting member 161 upward, and thus the display unit DP may be driven upward. The specific configuration of the lifting unit 160 is substantially the same as the first exemplary embodiment of the present disclosure described above.

[0205] One end of the roller lifting member 161 is hinged to one end of the connecting rod 162L, and the other end may be rotatably fastened to the fastening unit 364 connected to the second rotating shaft 363. The second roller 351b is axially coupled to the second rotating shaft 363, and the second rotating shaft 363 may be fastened to the fastening unit 364. The roller lifting member 161 may be rotatably fastened to the fastening unit 364 through the hinge rotating sleeve 165, but is not limited thereto. Therefore, the roller lifting member 161 is lifted or lowered to lift or lower the second roller 351b fastened to the fastening unit 364. By doing so, the display unit DP may be lifted or lowered.

[0206] Meanwhile, a torsion spring 355 may be installed in the second roller 351b to be wound around the second rotation axis 363, but is not limited thereto. The torsion spring 355 always pulls the display unit DP upward so that the display unit DP can be wound around the second roller 351b.

[0207] In some exemplary embodiments, a driving unit having a structure other than the above-described driving unit may be applied to the display device 300. That is, as long as the display unit DP is rolled and unrolled, the above-described configurations of the roller unit 350 and the lifting unit 160 may be modified, some configurations may be omitted, or another configuration may be added.

[0208] Fig.17A and 17B is a schematic cross-sectional view illustrating an example of partial display in a display device according to a third exemplary embodiment of the present disclosure.

[0209] Fig.17A and 17B The reference symbol A in FIG. 8 represents the upper end of the display area. Fig.17A and 17B The screen-on shown indicates that a signal is applied to the corresponding display panel to display an image.

[0210] Fig.17A shows the basic types of partial displays as examples, Fig. 17B A modified shape of a partial display in which a viewing area moves is shown. Here, the viewing area refers to a display area in a screen that is in an on state.

[0211] refer to Fig.17A , in the display device according to the third exemplary embodiment of the present disclosure, the display unit DP may be lifted or lowered by the first motor and the second motor 390 .

[0212] That is, the first motor and the second motor 390 are controlled to elevate or lower the display unit DP and change the viewing area.

[0213] As described above, when the first motor is driven (turned on), the plurality of links of the lifting unit are extended upward to push the second roller 351b fastened to the lifting unit upward, and thus the display unit DP can be driven upward. When the display unit DP is lifted to a predetermined height and the first motor is turned off, the total height of the viewing area is constantly maintained and the corresponding display area is driven (turned on) to view an image.

[0214] At the same time, reference Fig. 17B , when the second motor 390 is driven in this state, the viewing area can be changed. That is, the second motor 390 is driven to release the lower end of the display unit DP longer, and the upper end of the display unit DP can be wound around the second roller 351b by the elastic force of the torsion spring installed in the second roller 351b. By doing so, the viewing area can be moved and the emission area can be flexibly adjusted. Therefore, the screen burn-in phenomenon is suppressed to improve the service life.

[0215] Exemplary embodiments of the present disclosure may also be described as follows:

[0216] According to one aspect of the present disclosure, a display device is provided, comprising a display panel having a display area, a back cover disposed on a rear surface of the display panel, a first roller for winding or unwinding the back cover and the display panel, and a second roller disposed above the first roller to move in a vertical direction, wherein the back cover and the display panel are overlapped on the second roller.

[0217] The display device may further include an extending sheet fastened to an upper end of the rear cover, wherein a lower end of the rear cover may be fastened to the first roller.

[0218] The display device may further include an extending sheet, which may be disposed on a rear surface of the rear cover and may have a lower end fastened to the first roller.

[0219] The display device may further include a housing unit accommodating the first roller, wherein the housing unit may include an opening through which the rear cover and the display panel may be moved to the outside and the inside of the housing unit.

[0220] The opening includes a first opening and a second opening, the back cover and the display panel can move in a vertical direction through the first opening, and the extension piece can move in a vertical direction through the second opening.

[0221] The display device may further include a third roller provided in the housing unit, wherein an upper end of the extending piece may be fastened to the third roller.

[0222] The display device may further include: a first rotation shaft which may be axially coupled to the first roller; a roller supporting unit which may be provided at both sides of the first roller and rotatably coupled to the first rotation shaft; and a torsion spring which may be wound around the first rotation shaft so as to be installed in the first roller.

[0223] The display device may further include a first motor disposed at one side of the first roller, and a driving shaft may be coupled to the first motor.

[0224] The display device may further include a plurality of connecting rods that may be disposed on the rear surface of the rear cover and hinged to each other, and a roller lifting member that may be connected to one end of the connecting rod, wherein the plurality of connecting rods may be connected to the driving shaft through the other end of the connecting rod so as to be lifted and lowered in the vertical direction according to the drive of the first motor.

[0225] The display device may further include a second rotation shaft which may be axially coupled to the second roller, and a fastening unit which may be connected to an end of the second rotation shaft, wherein the roller lifting member may be rotatably fastened with the fastening unit.

[0226] The display device may further include a second motor that may rotate the third roller, wherein the extending sheet may be wound around or unwound from the third roller by the rotation of the third roller.

[0227] According to another aspect of the present disclosure, a display device is provided. The display device includes a display panel having a display area, a back cover disposed on a rear surface of the display panel, a first roller connected to a lower end of the back cover to roll or unroll the back cover and the display panel, and a second roller disposed above the first roller to move in a vertical direction and fastened to an upper end of the back cover.

[0228] The display device may further include a first motor disposed at one side of the first roller, a driving shaft coupled to the first motor, and a second motor rotating the first roller.

[0229] The display device may also include a plurality of connecting rods that can be arranged on the rear surface of the rear cover and can be hinged to each other, and a roller lifting member that can be connected to one end of the connecting rod, wherein the plurality of connecting rods can be connected to the driving shaft through the other end of the connecting rod so as to be lifted and lowered in the vertical direction according to the drive of the first motor.

[0230] The display device may further include: a second rotating shaft which may be axially coupled to the second roller; a fastening unit which may be connected to an end of the second rotating shaft; a torsion spring which may be wound around the second rotating shaft so as to be installed in the second roller, wherein the roller lifting member may be rotatably fastened to the fastening unit.

[0231] According to another aspect of the present disclosure, a display device is provided. The display device includes: a display panel having a display area; a back cover disposed on the rear surface of the display panel; a first roller disposed in a housing unit and winding or unwinding the back cover and the display panel; a second roller disposed above the first roller to move in a vertical direction, wherein the back cover and the display panel are overlapped on the second roller; a third roller disposed in the housing unit; and an extension sheet disposed at an upper end of the back cover or on the rear surface of the back cover and fastened to the third roller through the upper end of the extension sheet.

[0232] The display device may further include a first motor which may be disposed at one side of the first roller and lift and lower the rear cover and the display panel, and a second motor which may rotate the third roller.

[0233] After lifting the back cover and the display panel by driving the first motor and winding the extension sheet around the third roller by driving the second motor, the first motor can be turned off to constantly maintain the height of the viewing area, where the viewing area refers to the display area in the display panel where the screen can be driven to display an image.

[0234] In a state where the first motor may be turned off, the second motor may be driven and the third roller may roll to move the viewing area.

[0235] The extension sheet may be wound around the third roller to position the upper end of the display area close to the third roller, and the first motor may be turned off, and the viewing area may be driven on the front and rear surfaces of the display device to display images.

[0236] Although the exemplary embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited thereto and can be implemented in a variety of different forms without departing from the technical concept of the present disclosure. Therefore, the exemplary embodiments of the present disclosure are only for the purpose of illustration and are not intended to limit the technical concept of the present disclosure. The scope of the technical concept of the present disclosure is not limited thereto. Therefore, it should be understood that the above exemplary embodiments are exemplary in all aspects and do not limit the present disclosure. The scope of protection of the present invention shall be based on the attached claims, and all technical concepts within the equivalent scope thereof shall be understood to fall within the scope of the present disclosure.

Claims

1. A display device, comprising: A display panel having a display area; a back cover disposed on the rear surface of the display panel; a first roller that rolls up or unrolls the rear cover and the display panel; a second roller disposed above the first roller to move in a vertical direction, the rear cover and the display panel being overlapped on the second roller; a housing unit that accommodates the first roller and includes an opening through which the rear cover and the display panel move to the outside and inside of the housing unit; an extension piece, the extension piece being fastened to the upper end of the rear cover, wherein the lower end of the rear cover is fastened to the first roller, or the extension piece being provided on the rear surface of the rear cover and having a lower end fastened to the first roller; a third roller disposed in the housing unit, the upper end of the extension piece being fastened to the third roller; a first motor which is disposed at one side of the first roller and lifts and lowers the rear cover and the display panel; a second motor that rotates the third roller, wherein the extension sheet is wound around or unwound from the third roller by the rotation of the third roller; and a torsion spring installed in the first roller to rotate the first roller, The first motor is driven to lift the lifting unit, and a plurality of connecting rods of the lifting unit are deployed upward by the drive of the first motor to push upward a roller lifting member of the lifting unit, thereby lifting the second roller fastened to the fastening unit, wherein the roller lifting member is rotatably fastened to the fastening unit.

2. The display device according to claim 1, wherein: The opening comprises: a first opening through which the rear cover and the display panel move in a vertical direction; and The second opening is formed by the extending piece moving along the vertical direction through the second opening.

3. The display device according to claim 1, wherein: The display device further includes: a first rotational shaft axially coupled to the first roller; a roller supporting unit provided at both sides of the first roller and rotatably coupled to the first rotating shaft; Wherein, the torsion spring is wound around the first rotation axis.

4. The display device according to claim 1, wherein: The plurality of links are provided on the rear surface of the rear cover and are hinged to each other; and The roller lifting member is coupled to one end of the connecting rod, The plurality of connecting rods are connected to a driving shaft coupled to the first motor through the other ends of the connecting rods to be lifted and lowered in the vertical direction according to driving of the first motor.

5. The display device according to claim 4, wherein: The display device further includes: a second rotational shaft axially coupled to the second roller; and The fastening unit is connected to an end portion of the second rotation shaft.

6. The display device according to claim 1, wherein: After lifting the rear cover and the display panel by driving the first motor and winding the extension sheet around the third roller by driving the second motor, the first motor is turned off to constantly maintain the height of a viewing area, wherein the viewing area refers to a display area in the display panel where a screen is driven to display an image.

7. The display device according to claim 6, wherein: In a state in which the first motor is turned off, the second motor is driven and the third roller is rolled to move the viewing area.

8. The display device according to claim 6, wherein: The extending sheet is wound around the third roller to position the upper end of the display area close to the third roller, and the first motor is turned off, and the viewing area is driven to display images on the front and rear surfaces of the display device.

9. A display device, comprising: A display panel having a display area; a back cover disposed on the rear surface of the display panel; a first roller connected to a lower end of the rear cover to roll or unroll the rear cover and the display panel; a second roller disposed above the first roller to move in a vertical direction and fastened to an upper end of the rear cover; a housing unit that accommodates the first roller and includes an opening through which the rear cover and the display panel move to the outside and inside of the housing unit; a first motor which is disposed at one side of the first roller and lifts and lowers the rear cover and the display panel; a second motor that rotates the first roller; and a torsion spring installed in the second roller to rotate the second roller, The first motor is driven to lift the lifting unit, and a plurality of connecting rods of the lifting unit are deployed upward by the drive of the first motor to push upward a roller lifting member of the lifting unit, thereby lifting the second roller fastened to the fastening unit, wherein the roller lifting member is rotatably fastened to the fastening unit.

10. The display device according to claim 9, wherein: The plurality of links are provided on the rear surface of the rear cover and are hinged to each other, and The roller lifting member is coupled to one end of the connecting rod, The plurality of connecting rods are connected to a driving shaft coupled to the first motor through the other ends of the connecting rods to be lifted and lowered in the vertical direction according to the driving of the first motor.

11. The display device according to claim 10, wherein: The display device further includes: a second rotational shaft axially coupled to the second roller; and The fastening unit is connected to an end portion of the second rotation shaft.

Images