Volume adjustment gestures and accidental touch prevention for rollable devices

Abstract

A device and method for detecting a multi-touch gesture (10) to adjust the audio output volume (9) of media content played on a device (1) having a rollable display (4), wherein the multi-touch gesture (10) is a sliding gesture or a double-click gesture of two fingers detected simultaneously on a curved portion of the display (4), the curved portion forming a side screen (5) curved around a roller unit (3); and wherein the multi-touch gesture (10) is considered valid only if the distance (D) or speed (S) of the sliding gesture and / or the time interval (T) between the click gestures exceeds a predetermined threshold.

Description

Technical Field

[0001] The present invention generally relates to a rollable display device having an audio output unit, and more particularly, to a method and apparatus for detecting gestures on a rollable display to adjust the audio output volume of the device. Background Art

[0002] Consumers are very interested in large and bright display devices, so the demand for display devices that are easy to carry and store is increasing. A flexible display panel provides a portability solution for using a display panel, in which multiple pixels are arranged on a flexible substrate such as a plastic film instead of a rigid substrate, so that it can be easily bent.

[0003] Therefore, rollable display devices, foldable display devices, and expandable display devices using flexible display panels have been developed. Such rollable display devices include a flexible display panel that can be expanded by a roller unit to increase the available screen area and can be rolled up to a compact position to increase portability, the roller unit is used to support the curved portion of the flexible display panel to roll around the roller unit, and a driving module is used to rotate the roller unit in response to a driving signal. Some rollable display devices include a touch-sensitive flexible display panel that can also be used as an input device by detecting touch gestures.

[0004] However, a problem with such a rollable display device is that one side of the device where control buttons (e.g., for controlling the audio output volume) are typically placed forms part of the flexible display panel and is therefore not fixed. Furthermore, there is no option provided anywhere near the side of the device for a user to intuitively use fixed control buttons for, e.g., volume control. Providing a dedicated input area on a touch-sensitive display panel also presents a problem in that a user may accidentally touch the display in the dedicated area and accidentally adjust the volume.

[0005] Therefore, there is a need to provide a solution that enables a user to provide intuitive input to adjust the volume of media content played on a rollable display device while also avoiding accidental adjustment of the volume. Summary of the invention

[0006] Therefore, a method and apparatus for detecting a user gesture on a rollable display to adjust the audio output volume is provided, which overcomes or at least reduces the above-mentioned problems.

[0007] The above and other objects are achieved by the features of the independent claims. Other implementations are apparent from the dependent claims, the description and the drawings.

[0008] According to a first aspect, there is provided a device comprising:

[0009] case;

[0010] a roller unit rotatably mounted in the housing;

[0011] a flexible touch-sensitive display for rolling on the roller unit around a roll axis so that a first curved portion of the display forms a side screen curved around the roller unit and a second flat portion of the display forms a front screen, wherein an area of ​​the front screen changes according to a rotation of the roller unit;

[0012] A controller is configured to adjust an audio output volume of the device after a predefined multi-touch gesture is detected on the side screen.

[0013] Detecting predefined multi-touch gestures on the curved side portion of the rollable display provides a user with an intuitive input method (in a typical smartphone device, physical volume keys are usually set on the side portion of the device) for adjusting the volume of media content playing on the rollable display device, without requiring any special hardware or additional user interface (UI) elements on the device itself.

[0014] In one embodiment, the predefined multi-touch gesture includes two touch inputs detected simultaneously on the side screen, and a predefined movement of at least one of the two touch inputs.

[0015] Limiting the types of multi-touch gestures used to adjust the audio output volume to two simultaneously detected touch inputs with predefined movements can prevent users of handheld devices from accidentally adjusting the volume.

[0016] In a possible implementation of the first aspect, the predefined movement includes a detected sliding movement substantially parallel to the roll axis, and the controller is used to detect the multi-touch gesture only when the distance of the sliding movement is greater than half the length of the side screen, wherein the length is measured parallel to the roll axis to better avoid accidental adjustment of the volume.

[0017] In another possible implementation manner of the first aspect, the predefined movement includes sliding movements of two touch inputs in opposite directions, wherein a distance of the sliding movement is defined as a combined movement distance of the two touch inputs; and the controller is configured to:

[0018] When the two touch inputs are detected sliding away from each other, increasing the audio output volume to a maximum level,

[0019] When it is detected that the two touch inputs slide toward each other, the audio output volume is reduced to a minimum level.

[0020] Gestures allow users to adjust volume quickly and precisely without accidentally adjusting the volume.

[0021] In another possible implementation manner of the first aspect, the predefined movement includes two touch inputs sliding in the same direction and moving the same distance; and the controller is configured to:

[0022] When the two touch inputs are detected sliding from the bottom of the side screen to the top of the side screen, increasing the audio output volume to a maximum level,

[0023] When the two touch inputs are detected sliding from the top of the side screen to the bottom of the side screen, reducing the audio output volume to a minimum level;

[0024] Therein, the top and the bottom are defined as opposite portions of the side screen along the roll axis, determined relative to the orientation of the device.

[0025] Gestures allow users to adjust volume quickly and precisely without accidentally adjusting the volume.

[0026] In another possible implementation manner of the first aspect, the predefined movement includes a sliding movement of the mobile touch input relative to the fixed touch input; and the controller is configured to:

[0027] When it is detected that the moving touch input slides away from the fixed touch input, increasing the audio output volume to a higher level,

[0028] When it is detected that the moving touch input slides toward the fixed touch input, the audio output volume is reduced to a lower level.

[0029] Gestures allow users to gradually adjust the volume in a step-by-step manner without accidentally adjusting the volume.

[0030] In another possible implementation of the first aspect, the controller is configured to determine an adjustment amount of the audio output volume that is proportional to the predefined movement distance of the at least one touch input of the two touch inputs, which improves the accuracy of volume adjustment.

[0031] In another possible implementation of the first aspect, the controller is configured to determine an adjustment amount of the audio output volume that is proportional to a speed s of the predefined movement of at least one of the two touch inputs, thereby improving the accuracy of volume adjustment.

[0032] In another possible implementation of the first aspect, the controller is configured to detect the multi-touch gesture only when a measured speed of the predefined movement is greater than a predefined speed threshold, which can further limit accidental volume adjustment.

[0033] In another possible implementation of the first aspect, the predefined movement includes a double-touch gesture, wherein two touch inputs are detected simultaneously on the side screen at a first moment and detected again at a second moment, and the controller is configured to detect the multi-touch gesture only when a time interval between the first moment and the second moment is greater than a predefined time threshold. The gesture allows the user to adjust the volume quickly and accurately without accidentally adjusting the volume.

[0034] In another possible implementation manner of the first aspect, the controller is used to:

[0035] If the double-tap gesture is detected in the top portion of the side screen, increasing the audio output volume to a maximum level,

[0036] If the double-tap gesture is detected in the bottom portion of the side screen, reducing the audio output volume to a minimum level,

[0037] Therein, the top and the bottom are defined as opposite portions of the side screen along the roll axis, determined relative to the orientation of the device.

[0038] In another possible implementation of the first aspect, the controller is configured to detect the multi-touch gesture only if the multi-touch gesture appears in a central portion of the side screen, the central portion being defined by extending within a predefined distance from a center line of the side screen parallel to the roll axis. In one embodiment, the predefined distance is determined such that an area of ​​the central portion is between 70% and 90% of an area of ​​the side screen, more preferably 80% of an area of ​​the side screen. This can further limit accidental volume adjustments.

[0039] In another possible implementation manner of the first aspect, the display is configured to be rolled up to different degrees on the roller unit between a rolled-up state and an unfolded state, wherein a position of the side screen relative to an edge of the display changes according to the degree to which the display is unfolded.

[0040] In another possible implementation manner of the first aspect, the third plane portion of the display forms a rear screen, wherein an area of ​​the rear screen changes according to a rotation of the roller unit.

[0041] According to a second aspect, a method for controlling an audio output volume of a rollable display device is provided, the method comprising:

[0042] A device according to any possible implementation of the first aspect is provided, the device comprising a flexible touch-sensitive display, a curved portion of the display forming a side screen;

[0043] detecting a predefined multi-touch gesture on the side screen;

[0044] The audio output volume of the device is adjusted according to the configuration of the controller of the device.

[0045] These and other aspects will be apparent from one or more of the embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In the following detailed section of the present invention, various aspects, embodiments and implementations will be explained in more detail with reference to exemplary embodiments shown in the accompanying drawings, in which:

[0047] Figure 1 A cross-sectional view of a rollable display device provided by an embodiment of the first aspect is shown;

[0048] Figure 2 An isometric view of a rollable display device provided by an embodiment of the first aspect is shown;

[0049] Figure 3A and Figure 3B A side view of a rollable display device provided by another embodiment of the first aspect is shown;

[0050] Figure 4A and Figure 4B A side view of a rollable display device provided by another embodiment of the first aspect is shown;

[0051] Figure 5 A side view of a rollable display device provided by another embodiment of the first aspect is shown;

[0052] Figure 6 A flowchart showing the functions of a rollable display device provided by an embodiment of the second aspect;

[0053] Figure 7 A flowchart showing the functions of a rollable display device provided by another embodiment of the second aspect;

[0054] Figure 8 A flowchart showing the functions of a rollable display device provided by another embodiment of the second aspect;

[0055] Fig. 9A side view of a rollable display device provided by another embodiment of the first aspect is shown;

[0056] Fig.10 A flowchart showing the functions of a rollable display device provided by another embodiment of the second aspect. DETAILED DESCRIPTION

[0057] Figure 1 The rollable display device 1 provided by the present invention is shown in a cross-sectional view. The device 1 comprises a housing 2 and a roller unit 3 rotatably mounted in the housing 2. The device 1 further comprises a flexible touch-sensitive display 4, which is adapted to be rolled up on the roller unit 3 around a roll axis 3A. Figure 1 As shown, the first curved portion of the display 4 forms a side screen 5 curved around the roller unit 3, and the second flat portion of the display 4 forms a front screen 6 facing the user. The area of ​​the front screen 6 changes according to the rotation of the roller unit 3.

[0058] In one embodiment, the display 4 is adapted to be rolled to different degrees on the roller unit 3 between a rolled-up state and an unfolded state (as shown by the dotted line), wherein the position of the side screen 5 relative to the edge of the display 4 changes depending on the degree to which the display 4 is unfolded.

[0059] The third planar portion of the display 4 may form a rear screen 7 , wherein the area of ​​the rear screen 7 may also be changed depending on the rotation of the roller unit 3 .

[0060] The device 1 further comprises a controller 8 connected to the audio output and configured to adjust the volume 9 of the audio output of the device 1 after a predefined multi-touch gesture 10 is detected on the side screen 5 .

[0061] Multi-touch is a technology that enables a touch screen to recognize that there is more than one point of contact with the screen surface, whereby in this case, a multi-touch gesture is made by touching the rollable touch-sensitive display with multiple points of contact (e.g., a user's fingers) with or without movement of the points of contact (fingers) across the display. These multi-touch gestures help users perform tasks quickly and intuitively on, for example, mobile devices.

[0062] In one embodiment, the device 1 is a smart device. The smart device may be a smart phone (preferred embodiment) or any other smart device, such as a smart TV, a smart watch, etc.

[0063] Figure 2 The rollable display device 1 provided by the present invention is shown in a 3D isometric view, showing how the length L of the side screen is measured parallel to the roll axis 3A. For simplicity, features identical or similar to corresponding features previously described or shown herein and below are denoted by the same reference numerals as previously used.

[0064] In one embodiment, the predefined multi-touch gesture 10 for adjusting the audio output volume 9 of the device 1 comprises two touch inputs 11 detected simultaneously on the side screen 5 , and a predefined movement 12 at the two touch inputs 11 .

[0065] Figure 3A and Figure 3B An embodiment of the device 1 is shown, wherein the predefined movement 12 comprises a sliding movement detected on the side screen 5 in opposite directions and substantially parallel to the roll axis 3A. In this embodiment, the predefined multi-touch gestures 10 comprise the following: Figure 3A The two touch inputs 11A, 11B shown slide away from each other (also called a "spread" gesture), or as shown in FIG. Figure 3B Two touch inputs 11A, 11B are shown sliding towards each other (also known as a "pinch" gesture).

[0066] like Figure 3B As further shown in FIG. 1 , the sliding movement distance D in this embodiment is defined as the combined movement distance of the two touch inputs 11A and 11B. In some embodiments, the controller 8 is configured to detect the multi-touch gesture 10 only when the detected sliding movement distance D of the two touch inputs 11A and 11B is greater than half the length L of the side screen 5 (D>0.5L).

[0067] Figure 4A and Figure 4B An embodiment of the device 1 is shown, wherein the predefined movement 12 comprises sliding movements detected on the side screen 5 in the same direction, substantially the same distance D and substantially parallel to the roll axis 3A. In this embodiment, the predefined multi-touch gestures 10 comprise the following: Figure 4A The two touch inputs 11A, 11B shown slide from the bottom 5B of the side screen 5 to the top 5A of the side screen 5, or as shown in FIG. Figure 4B The two touch inputs 11A, 11B are shown sliding from a top 5A of the side screen 5 to a bottom 5B of the side screen 5 , wherein top and bottom 5B are defined as opposite parts of the side screen 5 along the roll axis 3A, determined relative to the orientation of the device 1 .

[0068] Figure 5 An embodiment of the device 1 is shown, wherein the predefined movement 12 comprises a sliding movement of a mobile touch input 11A detected on the side screen 5 substantially parallel to the roll axis 3A relative to the fixed touch input 11B. The sliding of the mobile touch input 11A away from or towards the fixed touch input 11B may be detected, and the sliding distance in this embodiment is defined as the distance moved by the mobile touch input 11A.

[0069] Figures 6 to 8The flowchart shows the functions of different embodiments of the rollable display device provided by the present invention based on different configurations of the controller 8 and based on detecting different predefined multi-touch gestures 10 as described above.

[0070] Figure 6 An embodiment of a device 1 that can be implemented separately or combined as one controller configuration is shown. In a first step 101, as described above, a predefined multi-touch gesture 10 is detected on the side screen 5. In this embodiment, the predefined multi-touch gesture 10 includes two touch inputs 11 detected simultaneously on the side screen 5, and a predefined movement 12 of at least one of the two touch inputs 11, wherein the predefined movement 12 includes a detected sliding movement having a detected distance D substantially parallel to the roll axis 3A.

[0071] In the next step 103A, the controller 8 compares the detected distance D with the length of the side screen 5, and interprets the gesture as valid only if the sliding movement distance D is greater than half the length L of the side screen 5 (D>0.5L), otherwise the gesture is ignored.

[0072] In the above Figure 5 In the described embodiment, the predefined movement 12 is detected (104C) as a sliding movement of a mobile touch input 11A relative to a fixed touch input 11B, wherein the controller 8 is configured to increase (102C) the audio output volume 9 to a higher level when the mobile touch input 11A is detected to slide away from the fixed touch input 11B, or to decrease (102D) the audio output volume 9 to a lower level when the mobile touch input 11A is detected to slide toward the fixed touch input 11B.

[0073] According to this embodiment, the volume is gradually increased or decreased in a step-by-step manner. Step-by-step volume adjustment refers to increasing or decreasing the volume by one or more levels.

[0074] For example, if the volume level of device 1 changes from 0 to 10 in steps of 1, and the exemplary initial volume level of the device is level 5, then a step-by-step increase in volume changes the volume level of the device to levels 6, 7, 8, 9, and 10; accordingly, a step-by-step decrease in volume changes the volume level of the device to levels 4, 3, 2, 1, and 0.

[0075] It should be noted that the movement of the two touch inputs 11A and 11B for adjusting the volume provided in the embodiment described above in conjunction with FIG. 3 and FIG. 4 is different from Figure 5Specifically, two touch inputs 11A and 11B of the user who moves the touch side screen 5 in the first manner are used for volume adjustment, while only the touch input 11A of the two touch inputs of the user who moves the touch side screen 5 in the second manner is used for volume adjustment. In this way, extreme volume adjustment and gradual volume adjustment can be clearly distinguished.

[0076] In one embodiment, the controller 8 is configured to determine an adjustment amount of the audio output volume 9 that is proportional to a distance D of a predefined movement 12 of the moving touch input 11A relative to the fixed touch input 11B.

[0077] Combined with the above Figure 4A and Figure 4B In the described embodiment, the predefined movement 12 is detected (104B) as a sliding movement of two touch inputs 11A, 11B in the same direction, wherein the controller 8 is configured to increase (102A) the audio output volume 9 to a maximum level when the two touch inputs 11A, 11B are detected to slide from the bottom 5B of the side screen 5 to the top 5A of the side screen 5, and to decrease (102B) the audio output volume 9 to a minimum level when the two touch inputs 11A, 11B are detected to slide from the top 5A of the side screen 5 to the bottom 5B of the side screen 5.

[0078] Combined with the above Figure 3A and Figure 3B In the described embodiment, the predefined movement 12 is detected (104A) as a sliding movement of two touch inputs 11A, 11B in opposite directions, wherein the controller 8 is configured to increase (102A) the audio output volume 9 to a maximum level when the two touch inputs 11A, 11B are detected sliding away from each other, and to decrease (102B) the audio output volume 9 to a minimum level when the two touch inputs 11A, 11B are detected sliding toward each other.

[0079] It should be noted that these gestures for muting or maximizing the volume are intuitive. When performing the "pinch" gesture, the interval between the two touch inputs 11A, 11B is significantly reduced. This indicates minimizing (i.e., muting) the volume. Alternatively, when performing the "open gesture", the interval between the two touch inputs 11A, 11B is significantly increased. This indicates maximizing the volume. Therefore, the user does not need to specifically memorize any complex gesture patterns to mute or maximize the audio output volume.

[0080] Figure 7Other embodiments of the device 1 that can be implemented separately or combined into one controller configuration are shown. In a first step 101, as described above, a predefined multi-touch gesture 10 is detected on the side screen 5. In this embodiment, the predefined multi-touch gesture 10 includes two touch inputs 11 detected simultaneously on the side screen 5, and a predefined movement 12 of at least one of the two touch inputs 11, wherein the predefined movement 12 includes a detected sliding movement substantially parallel to the roll axis 3A.

[0081] In one embodiment, as described above, the controller 8 compares the sliding distance D of the detected one or more touch inputs 11 with the length of the side screen 5 (103A), and interprets the gesture as valid only when the sliding movement distance D is greater than half the length L of the side screen 5 (D>0.5L), otherwise the gesture 10 is ignored.

[0082] In another embodiment, the controller 8 compares (103B) the measured speed S of the predefined movement 12 of one or more touch inputs 11 with a predefined speed threshold Ts, and interprets the gesture as valid only if the speed S is greater than the predefined speed threshold (S>Ts), otherwise the gesture 10 is ignored.

[0083] Where either or both comparisons result in a valid multi-touch gesture 10 , the controller adjusts ( 102 ) the audio output volume 9 of the device 1 based on the detected multi-touch gesture 10 .

[0084] In one embodiment, the controller 8 is further configured to determine ( 102E) an adjustment amount of the audio output volume 9 that is proportional to a speed S of the predefined movement 12 of at least one of the two touch inputs 11 .

[0085] It should be noted that in Figure 5 In the embodiment shown, a slow sliding movement can adjust the volume by one volume level, while a fast sliding movement can adjust the volume by two volume levels. Therefore, the steps of the step-by-step volume adjustment are directly related to the sliding speed on the side screen 5. The greater the sliding speed, the greater the step size of the step-by-step volume adjustment.

[0086] Figure 8Another embodiment of the device 1 is shown, wherein the predefined movement 12 comprises a "double tap" gesture, wherein two touch inputs 11 are simultaneously detected on the side screen 5 at a first moment and again at a second moment. In this embodiment, the controller 8 is configured to increase (102A) the audio output volume 9 to a maximum level if the double tap gesture is detected in the top 5A of the side screen 5, and to decrease (102B) the audio output volume 9 to a minimum level if the double tap gesture is detected in the bottom 5B of the side screen 5, wherein the top 5A and the bottom 5B are defined as opposite portions of the side screen 5 along the roll axis 3A, determined relative to the orientation of the device 1, as Figure 4A and Figure 4B shown.

[0087] In this embodiment, the controller 8 may also be configured to detect ( 103C) the multi-touch gesture 10 only when the time interval T between the first moment and the second moment is greater than a predefined time threshold Tr (T>Tr), and ignore the gesture 10 otherwise.

[0088] Fig. 9 and Fig.10 Through the side view ( Fig. 9 ) and functional flow chart ( Fig.10 ) shows a rollable display device 1 provided by another embodiment, wherein the controller 8 is used to detect (103D) the multi-touch gesture 10 only when the multi-touch gesture 10 appears in the central portion 5C of the side screen 5, and the central portion 5C is defined by extending within a predefined distance Dp from a center line C of the side screen 5 parallel to the roll axis 3A. In one embodiment, the predefined distance Dp is determined so that the area of ​​the central portion 5C is between 70% and 90% of the area of ​​the side screen 5, and more preferably 80% of the area of ​​the side screen 5.

[0089] In another optional embodiment, the side screen 5 may display a virtual UI icon that facilitates adjusting the audio output volume through a multi-touch gesture. When two fingers of the user touch the display, the virtual UI icon may be displayed. The length of the virtual UI icon may be selected to be slightly greater than half the length of the side screen 5 (>0.5L).

[0090] Various aspects and various implementations are described herein in conjunction with various embodiments. However, those skilled in the art, in practicing the subject matter for which protection is sought, can understand and implement other variations of the disclosed embodiments by studying the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and "one" or "an" does not exclude multiple. A single processor or other unit can implement the functions of several items listed in the claims. The listing of some measures in mutually different dependent claims does not mean that the combination of these measures cannot be used to obtain advantages. The computer program may be stored or distributed on a suitable medium, such as an optical storage medium or solid-state medium provided together with other hardware or as part of other hardware, and may also be distributed in other forms, such as through the Internet or other wired or wireless telecommunications systems.

[0091] Any reference signs used in the claims should not be construed as limiting the scope.

Claims

1. A display device (1), characterized in that: include: Housing (2); A roller unit (3) rotatably mounted in the housing (2); A flexible touch-sensitive display (4) for rolling on the roller unit (3) around a rolling axis (3A), so that a first curved portion of the display (4) forms a side screen (5) curved around the roller unit (3), and a second flat portion of the display (4) forms a front screen (6), wherein the area of ​​the front screen (6) changes according to the rotation of the roller unit (3); A controller (8) is used to adjust the audio output volume (9) of the display device (1) after a predefined multi-touch gesture (10) is detected on the side screen (5), wherein the predefined multi-touch gesture (10) includes two touch inputs (11) detected simultaneously on the side screen (5), and a predefined movement (12) of at least one of the two touch inputs (11).

2. The display device (1) according to claim 1, characterized in that: The predefined movement (12) comprises a detected sliding movement substantially parallel to the roll axis (3A), The controller (8) is used to detect the multi-touch gesture (10) only when the distance D of the sliding movement is greater than half the length L of the side screen (5) (D>0.5L), wherein the length is measured parallel to the roll axis (3A).

3. The display device (1) according to claim 2, characterized in that The predefined movement (12) comprises sliding movement of two touch inputs (11A, 11B) in opposite directions, wherein a distance D of the sliding movement is defined as a combined movement distance of the two touch inputs (11A, 11B); and the controller (8) is used to: When the two touch inputs (11A, 11B) are detected sliding away from each other, increasing the audio output volume (9) to a maximum level, When the two touch inputs (11A, 11B) are detected sliding towards each other, the audio output volume (9) is reduced to a minimum level.

4. The display device (1) according to claim 2, characterized in that The predefined movement (12) includes two touch inputs (11A, 11B) sliding in the same direction and moving the same distance D; and the controller (8) is used to: When the two touch inputs (11A, 11B) are detected sliding from the bottom (5B) of the side screen (5) to the top (5A) of the side screen (5), increasing the audio output volume (9) to a maximum level, When the two touch inputs (11A, 11B) are detected to slide from the top (5A) of the side screen (5) to the bottom (5B) of the side screen (5), reducing the audio output volume (9) to a minimum level; Wherein, the top (5A) and the bottom (5B) are defined as relative parts of the side screen (5) along the roll axis (3A), determined relative to the orientation of the display device (1).

5. The display device (1) according to claim 2, characterized in that The predefined movement (12) comprises a sliding movement of the mobile touch input (11A) relative to the fixed touch input (11B); wherein the controller (8) is used to: when it is detected that the moving touch input (11A) slides away from the fixed touch input (11B), increasing the audio output volume (9) to a higher level, When it is detected that the moving touch input (11A) slides towards the fixed touch input (11B), the audio output volume (9) is reduced to a lower level.

6. The display device (1) according to any one of claims 1 to 5, characterized in that: The controller (8) is used to determine an adjustment amount of the audio output volume (9) that is proportional to a distance D of the predefined movement (12) of the at least one of the two touch inputs (11).

7. The display device (1) according to any one of claims 1 to 5, characterized in that: The controller (8) is used to determine an adjustment amount of the audio output volume (9) that is proportional to a speed S of the predefined movement (12) of the at least one of the two touch inputs (11).

8. The display device (1) according to any one of claims 1 to 5, characterized in that: The controller (8) is used to detect the multi-touch gesture (10) only when the measured speed S of the predefined movement (12) is greater than a predefined speed threshold Ts (S>Ts).

9. The display device (1) according to claim 1, characterized in that The predefined movement (12) comprises a double-tap gesture, wherein the two touch inputs (11) are detected simultaneously on the side screen (5) at a first moment and are detected again at a second moment, The controller (8) is configured to detect the multi-touch gesture (10) only when a time interval T between the first moment and the second moment is greater than a predefined time threshold Tr (T>Tr).

10. The display device (1) according to claim 9, characterized in that The controller (8) is used to: if the double-click gesture is detected in the top portion (5A) of the side screen (5), increasing the audio output volume (9) to a maximum level, if the double-click gesture is detected in the bottom portion (5B) of the side screen (5), reducing the audio output volume (9) to a minimum level, Wherein, the top (5A) and the bottom (5B) are defined as relative parts of the side screen (5) along the roll axis (3A), determined relative to the orientation of the display device (1).

11. The display device (1) according to any one of claims 1 to 5, characterized in that: The controller (8) is configured to detect the multi-touch gesture (10) only if the multi-touch gesture (10) occurs in a central portion (5C) of the side screen (5), the central portion (5C) being defined by extending within a predefined distance Dp from a center line C of the side screen (5) parallel to the roll axis (3A); wherein The predefined distance Dp is determined such that the area of ​​the central portion (5C) is between 70% and 90% of the area of ​​the side screen (5).

12. The display device (1) according to claim 11, characterized in that The predefined distance Dp is determined so that the area of ​​the central portion (5C) is 80% of the area of ​​the side screen (5).

13. The display device (1) according to any one of claims 1 to 5, characterized in that The display (4) is used to be rolled up to different degrees on the roller unit (3) between a rolled-up state and an unfolded state, wherein the position of the side screen (5) relative to the edge of the display (4) changes according to the degree to which the display (4) is unfolded.

14. The display device (1) according to any one of claims 1 to 5, characterized in that The third planar portion of the display (4) forms a rear screen (7), wherein the area of ​​the rear screen (7) changes according to the rotation of the roller unit (3).

15. A method for controlling the audio output volume (9) of a rollable display device (1), characterized in that: The method comprises: There is provided a display device (1) according to any one of claims 1 to 14, the display device (1) comprising a flexible touch-sensitive display (4), a curved portion of the display (4) forming a side screen (5); Detecting a predefined multi-touch gesture (10) on the side screen (5), wherein the predefined multi-touch gesture (10) comprises two touch inputs (11) detected simultaneously on the side screen (5), and a predefined movement (12) of at least one of the two touch inputs (11); The audio output volume (9) of the display device (1) is adjusted according to the configuration of the controller (8) of the display device (1).

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