Curl gestures and accidental touch prevention on curled devices

Abstract

A device and method for intuitively adjusting the screen size of a front screen (5) of a touch-sensitive display (4) on a rollable display device (1) by detecting a touch gesture (9) (preferably a multi-touch sliding gesture) on the front screen (5); wherein the gesture (9) is considered valid and can be used to roll up or unfold the display (4) only when the distance D and direction of the multi-touch sliding gesture correspond to certain predetermined constraints relative to the actual length L of the front screen (5) and the roller (3A) of the device (1).

Description

Technical Field

[0001] The present invention relates generally to flexible display devices, and more particularly to methods and devices for detecting gestures on a rollable display device to adjust the display size of the device. Background Art

[0002] Consumers are increasingly interested in large, bright display devices, and as a result, there is a growing demand for display devices that are easy to carry and store. Flexible display panels offer a solution to achieving portability by using display panels where multiple pixels are arranged on a flexible substrate such as a plastic film rather than a rigid substrate, so they can be bent easily.

[0003] Accordingly, rollable display devices, foldable display devices, and unfoldable display devices using flexible display panels have been developed. Such rollable display devices include a flexible display panel that can be unfolded to increase the available screen area and can be rolled up to a compact position to increase portability, which is achieved by using a reel unit to support a curved portion of the flexible display panel that is rolled up around the reel unit, and using a drive module to rotate the reel unit in response to a drive signal. Some rollable display devices include a flexible touch-sensitive display panel that can also act as an input device by detecting touch gestures.

[0004] However, the problem with such rollable display devices is that it is difficult to provide intuitive control options to roll up and roll out such rollable displays to adjust the screen size. Such control options are usually placed on the side of the device (similar to audio output volume control options), but one side of the device in a rollable display device forms part of the flexible display panel and is therefore not fixed. Using the touch-sensitive display panel itself for input detection to adjust the display size can also cause the user to inadvertently touch the dedicated area of ​​the display device and accidentally roll up or roll out the display device.

[0005] The prior art has attempted to solve the above problems in a variety of ways. However, they still have certain disadvantages.

[0006] According to one solution, the screen size of the flexible display is adaptively adjusted according to the size of the content (selected by the user). In this solution, the screen can also be adjusted according to the screen ratio of the content, wherein the screen ratio of the content can be changed by the user using an external device coupled to the display device. In this case, the user can provide touch input, voice input, or motion gestures (for example, by rotating the mobile device) to adjust the screen size. However, in this case, the gesture for curling the rollable display device is not intuitive and indirectly affects the curling of the rollable display device (when the user makes a gesture to select the content, the gesture is suitable for curling the display device). In addition, this solution does not include any measures to avoid accidentally curling the rollable display device.

[0007] According to another approach, multiple user inputs such as touch, click, gesture, etc. can be used to change or manage the topological configuration of a dynamically deformable display device with integrated touch detection, and the deformable touch display device can be rolled or unfolded, etc., to dynamically change the screen size. In this case, the user can define, update, or modify policies to cause actions corresponding to a given topology (e.g., disabling a portion of the display device to avoid unintentional touch input) to occur. However, this approach does not provide any details of the touch gestures that the user may provide to change the topological configuration of the deformable display device. In addition, this approach does not disclose any specific features of the touch gestures required to prevent the topology of the deformable display device from being accidentally changed.

[0008] According to other schemes, the flexible electronic screen or multi-touch display device can be rolled up according to an "expand command" provided as a user's finger, pen, stylus and / or multi-touch input, or the rolling and unfolding of the display device can be performed by arm movement.

[0009] However, these solutions do not include any details of a specific touch gesture that a user may provide to roll up a flexible electronic screen. In addition, they do not disclose any specific features of a touch gesture that can be used to prevent the flexible display device from accidentally rolling up.

[0010] In addition to the above solutions, there are other patent documents, such as US20180364827 (LG Electronics Inc), US20160378270A1 (Samsung Electronics Co Ltd), and US7268491B2 (Google LLC), which mainly describe manual methods that require users to apply force to curl and unfold rollable display devices.

[0011] Therefore, there is still a need to provide a solution that enables a user to provide simple and intuitive input to adjust the rolling and unrolling of a rollable display device to adjust the front display size of the device, while also avoiding accidental adjustments caused by inadvertently touching the display device. Summary of the invention

[0012] Therefore, an object of the present invention is to provide a device and method for detecting user gestures on a rollable display device to adjust the display size, thereby overcoming or at least reducing the above problems.

[0013] The above and other objects are achieved by the features of the independent claims. Further implementations are apparent from the dependent claims, the detailed description and the drawings.

[0014] According to a first aspect, there is provided a device, comprising:

[0015] case;

[0016] a reel unit installed in the housing and configured to rotate around a roller;

[0017] a flexible touch-sensitive display for detecting touch gestures and curling around the scroll unit to define a flat front screen, the front screen size of which changes according to the degree of rotation of the scroll unit;

[0018] A controller is configured to rotate the scroll unit to adjust the size of the front screen in response to detecting a touch gesture on the front screen.

[0019] Detecting touch gestures on the front screen of the rollable display device provides a user with a simple and intuitive input method to adjust the rolling up and rolling out of the display device to accommodate different sizes and screen ratios of media content played on the rollable display device without adding any special hardware to the device. Therefore, the gesture can be used to quickly roll up the display device without any visual UI elements (such as slider switches, clickable icons, etc.) or physical user interaction elements (such as hardware buttons, scroll wheels, etc.).

[0020] In one embodiment, the touch gesture comprises slides of multiple touch inputs detected simultaneously or in a sequence immediately adjacent to each other in the same direction on the front screen, wherein the duration of the entire sequence corresponds to one slide.

[0021] In another embodiment, the plurality of touch inputs include four or five touch inputs detected simultaneously or in a sequence immediately adjacent to each other along the same direction on the front screen, wherein the duration of the entire sequence corresponds to one swipe.

[0022] Limiting the types of touch gestures used to adjust the size of the front screen to multiple touch inputs with a predefined slide detected simultaneously or in a close sequence to each other can avoid accidental adjustments caused by the user unconsciously touching the display device or simply holding the device.

[0023] In a possible implementation of the first aspect, the controller is configured to detect the touch gesture only when: the sliding is detected to be substantially perpendicular to the roller axis, and the sliding distance D is detected to be greater than half of the length L of the front screen (D>0.5L), wherein the length L is measured perpendicular to the roller axis. This allows further limiting accidental input and erroneous front screen size adjustment.

[0024] In another possible implementation manner of the first aspect, the front screen includes a first edge arranged parallel to and adjacent to the scroll unit and a second edge arranged opposite to the first edge, wherein the front screen is configured to be adjusted between a rolled-up state and an unfolded state by the controller, wherein the size of the front screen is the smallest when in the rolled-up state, and the size of the front screen is the largest when in the unfolded state; and the controller is further configured to:

[0025] In response to detecting the sliding in a direction from the first edge toward the second edge, adjusting the front screen to an unfolded state;

[0026] In response to detecting the sliding in a direction from the second edge toward the first edge, the front screen is adjusted to a rolled state.

[0027] This allows for more precise adjustment of the front screen size, while also ensuring that accidental inputs are avoided.

[0028] In another possible implementation of the first aspect, the controller is further used to: detect a distance D of the sliding on the front screen; and linearly adjust the size of the front screen to different degrees between the rolled-up state and the unfolded state according to the detected distance D.

[0029] This additional control allows the user to gradually adjust the front screen size in a step-by-step manner without accidental adjustment.

[0030] In another possible implementation of the first aspect, the controller is also used to: detect the sliding speed S on the front screen; adjust the rotation speed Sr of the scroll unit according to the detected sliding speed S, thereby adjusting the rolling-up speed or unfolding speed of the display.

[0031] This additional control allows the user to adjust the front screen size at a slow or fast speed, thereby allowing further control over the adjustment of the display.

[0032] In another possible implementation of the first aspect, the controller is used to detect the touch gesture only when the touch gesture appears in an edge area defined within an edge distance Dm from an upper edge of the front screen or a lower edge of the front screen, wherein the upper edge or the lower edge is perpendicular to the roller axis; wherein the distance is determined so that the edge area is between 10% and 30% of the front screen area, more preferably, 20% of the front screen area.

[0033] This additional restriction of the input detection area allows further avoidance of accidental resizing of the front screen.

[0034] In another possible implementation of the first aspect, the scroll unit further includes: gears arranged at both ends of the scroll unit for engaging the display; and a reversible drive unit for rotating the scroll unit around the roller in response to a control signal received from the controller, the control signal including instructions defining the direction and degree of rotation.

[0035] In another possible implementation manner of the first aspect, the driving unit is a motor, which is used to further adjust the rotation speed of the reel unit in proportion to the input voltage.

[0036] In another possible implementation of the first aspect, the device is a smart device, preferably a smart phone, and the controller is further used to: provide a user interface on the front screen of the display, and the user interface is adjusted in response to adjusting the size of the front screen.

[0037] In another possible implementation of the first aspect, the controller is further used to: provide at least one visual indicator in the form of a movement trajectory on the user interface, and the movement trajectory displays the swiping direction and the minimum swiping distance Dmin required for the controller to detect the touch gesture.

[0038] This additional visual feedback can further avoid accidental user input and more accurately adjust the front screen size, thereby ensuring a better user experience.

[0039] According to a second aspect, there is provided a method for controlling a curled display device, the method comprising:

[0040] Provide a device according to any possible implementation of the first aspect, the device comprising: a scroll unit; a flexible touch-sensitive display, configured to detect touch gestures and to be rolled up around the scroll unit, thereby defining a flat front screen, wherein a front screen size of the front screen changes according to a rotation of the scroll unit;

[0041] detecting a touch gesture of a user on the front screen;

[0042] The scroll unit is rotated in response to the detected touch gesture to adjust the front screen size according to the controller configuration of the device.

[0043] Detecting touch gestures on the front screen of the rollable display device provides a user with a simple and intuitive input method to adjust the rolling up and rolling out of the display device to accommodate different sizes and screen ratios of media content played on the rollable display device without adding any special hardware to the device. Therefore, the gesture can be used to quickly roll up the display device without any visual UI elements (such as slider switches, clickable icons, etc.) or physical user interaction elements (such as hardware buttons, scroll wheels, etc.).

[0044] These and other aspects will be apparent from one or more of the embodiments described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In the following detailed description of the present invention, aspects, embodiments and implementations are explained in more detail with reference to exemplary embodiments shown in the accompanying drawings.

[0046] Figure 1 A cross-sectional view of a rollable display device provided by an embodiment of the first aspect is shown;

[0047] Figure 2 An isometric view of a rollable display device provided by an embodiment of the first aspect is shown;

[0048] Figure 3 A top view showing a rollable display device in a rolled-up and rolled-out state provided by other embodiments of the first aspect;

[0049] Figure 4 A flow chart showing the working mechanism of the rollable display device provided by different embodiments of the second aspect;

[0050] Figure 5 A top view of a rollable display device showing an edge region provided by another embodiment of the first aspect is shown;

[0051] Figure 6 Different views of the gear and the driving unit of the rollable display device provided by another embodiment of the first aspect are shown;

[0052] Figure 7 A 3D side view of a gear and a driving unit of a rollable display device provided by an embodiment of the first aspect is shown from another angle;

[0053] Figure 8 A top view of a visual indicator on a user interface of a rollable display device provided by another embodiment of the first aspect is shown. DETAILED DESCRIPTION

[0054] Figure 1 A cross-sectional view of a rollable display device 1 provided by the present invention is shown. The rollable display device is defined as comprising a flexible display panel that can be rolled out around a reel unit (usually comprising one or more gears engaging the flexible display panel) to increase its available (front) screen area, and can be rolled up to a compact position to increase portability, which is achieved by using the reel unit to support the curved portion of the flexible display panel, and using a drive module to rotate the reel unit in response to a drive signal.

[0055] The rollable display device may include a flexible touch-sensitive display panel that may also act as an input device by detecting touch gestures. In some embodiments, the flexible touch-sensitive display panel uses multi-touch technology, whereby the display panel is able to recognize the presence of multiple contact points with the screen surface, whereby in this case, a multi-touch gesture is made by touching the rollable touch-sensitive display with multiple contact points (e.g., a user's fingers), with or without movement of the contact points (fingers) on the display. These multi-touch gestures may help users perform tasks quickly and intuitively on mobile devices and the like.

[0056] The device 1 provided by the present invention comprises a housing 2 and a reel unit 3 rotatably mounted in the housing 2. The device 1 further comprises a flexible touch-sensitive display 4, which is used to detect a touch gesture 9 and is rolled up on the reel unit 3 around a roller 3A of the reel unit 3. Figure 1 As shown, the curved portion of the display 4 forms a side screen curved around the reel unit 3, and the flat portion of the display 4 forms a front screen 5 facing the user. Therefore, the size of the front screen 5 changes according to the rotation degree of the reel unit 3. The third flat portion of the display 4 can form a rear screen, and the area of ​​the rear screen can also change according to the rotation of the reel unit 3.

[0057] The device 1 further comprises a controller 8 connected to the reel unit 3 and arranged to, in response to detecting a touch gesture 9 on the front screen 5, rotate the reel unit 3 to adjust the size of the front screen.

[0058] Figure 2A 3D isometric view of a rollable display device 1 provided by the present invention is shown, showing how the front screen length L is measured perpendicular to the roller axis 3A. For simplicity, features identical or similar to corresponding features described previously or shown herein and hereinafter are denoted by the same reference numerals used previously.

[0059] exist Figure 2 In the illustrated embodiment, the touch gesture 9 for adjusting the size of the front screen of the device 1 comprises a slide on the front screen 5. The touch gesture 9 may comprise multiple touch inputs (i.e., a multi-touch gesture) 10 detected simultaneously or in a sequence close to each other in the same direction on the front screen 5, such as Figure 3 The front screen 5 may include a first edge 6 arranged parallel to and adjacent to the scroll unit 3 and a second edge 7 arranged opposite to the first edge 6 , and the direction of the touch gesture 9 between the first edge 6 and the second edge 7 may determine the scrolling direction of the scroll unit 3 .

[0060] Figure 3 An embodiment of the device 1 is shown, in which the touch gesture 9 includes four touch inputs 10 detected simultaneously in the same direction or in a sequence immediately adjacent to each other on the front screen 5. In another possible embodiment, the touch gesture 9 may include five touch inputs 10 detected simultaneously in the same direction or in a sequence immediately adjacent to each other on the front screen 5. Defining such a minimum number of touch inputs can avoid accidentally rolling and unfolding the rollable touch-sensitive display 4 due to false touches.

[0061] like Figure 3 As further shown, in these embodiments, the distance D of the slide is defined as the moving distance of the touch input 10. In some embodiments, the controller 8 is used to detect the touch gesture 9 only when the detected distance D of the slide is greater than half the length L of the side screen 5 (i.e., D>0.5L). In another possible combination embodiment, the controller 8 is also used to detect the touch gesture 9 only when it is detected that the slide is substantially perpendicular to the roller 3A. This constraint on the minimum acceptable predefined distance can avoid accidentally rolling up or spreading out the display 4 due to false touches. When the distance moved by multiple fingers is less than the predefined distance, the gesture 9 is deemed invalid, and the rollable touch-sensitive display 4 will not be rolled up or spread out.

[0062] As shown in the figure, the front screen 5 can be configured to be adjusted between the rolled-up state 11 and the unfolded state 12 by the controller 8, wherein the size of the front screen is the smallest when in the rolled-up state 11, and the size of the front screen is the largest when in the unfolded state 12. In such embodiments, the controller 8 is configured to: adjust the front screen 5 to the unfolded state 12 when the sliding of the touch input 10 in the direction from the first edge 6 toward the second edge 7 is detected; and the controller 8 is further configured to: adjust the front screen 5 to the rolled-up state 11 in response to detecting the sliding of the touch input 10 in the direction from the second edge 7 toward the first edge 6.

[0063] This constraint of the bidirectionality of the gesture 9 stems from the fact that the user makes similar hand movements when opening and closing the sliding door. The user usually moves his / her hand in the direction required to move the sliding door. Similarly, in the present invention, the user can move multiple fingers in the direction of rolling out the display 4, and can also move multiple fingers in the direction of rolling up the display 4. Therefore, the gesture 9 for rolling and unfolding the rollable touch-sensitive display 4 is intuitive. The user does not need to specifically remember any complex gesture pattern for rolling and unfolding the rollable touch-sensitive display 4. The user only needs to move his / her multiple fingers in the direction required to roll up the display 4.

[0064] In one embodiment, the controller 8 may also be configured to: after detecting the sliding distance D on the front screen 5 , linearly adjust the size of the front screen to different degrees between the rolled-up state 11 and the unfolded state 12 according to the detected distance D.

[0065] In one embodiment, the controller 8 can also be used to: after detecting the sliding speed S on the front screen 5, adjust the rotation speed Sr of the scroll unit 3 according to the detected sliding speed S, thereby adjusting the rolling up speed or unrolling speed of the display 4.

[0066] Figure 4 A flow chart of the working mechanism of the roll-up display device according to the above configuration of the controller 8 is shown, wherein the roll-up display device can be implemented separately or combined into one controller 8 configuration.

[0067] In the first step 101, a predefined (multi-point) touch gesture 9 is detected on the front screen 5, as described above. In some embodiments, at least 2 simultaneous touch inputs 10 need to be detected before the touch gesture 9 is considered valid. In other possible embodiments, at least 3, 4 or 5 simultaneous touch inputs 10 need to be detected before the touch gesture 9 is considered valid. In other words, in order to roll up or unfold the rollable touch-sensitive display 4, the user needs to touch the front screen 5 with multiple fingers and move (slide) the multiple fingers on the front screen 5. This touch and move gesture is also commonly referred to as a "swipe". Therefore, gesture 9 can be understood as a multi-finger swipe gesture. This gesture requiring multiple fingers is rarely used on smart devices and is therefore very unique.

[0068] In a next step 102 , the controller 8 determines whether said sliding of the touch input 10 is detected substantially perpendicular to the roller axis 3A and in any other case ignores the (multi-point) touch gesture 9 to prevent accidental rolling up or unrolling of the display 4 .

[0069] In the next step 103, the sliding distance D of the detected touch input 10 is detected, and then the controller 8 compares the detected distance D with the actual length L of the side screen 5 104, and interprets the gesture 9 as valid only when the sliding distance D is greater than half of the length L of the front screen 5 (D>0.5L), otherwise the gesture 9 is ignored.

[0070] Accordingly, in a preferred embodiment, a given touch input 10 is inferred as a valid touch gesture 9 for controlling the rolling of the rollable touch-sensitive display 4 only when the above three constraints (touch input number, sliding direction and distance) are met.

[0071] In the embodiment described above, the controller 8 can also be used to: linearly adjust 105 the front screen size to different degrees (for example, 60% unfolded state, 75% unfolded state, 80% unfolded state, etc.) between the rolled-up state 11 and the unfolded state 12 according to the detected distance D.

[0072] According to another possible embodiment, the length L of the side screen 5 (and therefore the front screen size) is gradually increased or decreased in a stepwise or stepwise manner, wherein the stepwise adjustment refers to increasing or decreasing the length L of the side screen 5 by one or more predetermined levels between the minimum length (rolled-up state 11) and the maximum length (unrolled state 12).

[0073] Accordingly, in a final step 106, the scroll unit 3 is rotated in response to the detected touch gesture 9 to adjust the front screen size according to the controller 8 configuration of the device 1, as described above.

[0074] In a possible embodiment, Figure 4 As shown, the controller 8 is also used to: detect 201 the sliding speed S on the front screen 5 ; adjust 202 the rotation speed Sr of the scroll unit 3 according to the detected sliding speed S, thereby adjusting the rolling-up speed or unrolling speed of the display 4 .

[0075] Figure 5 Another embodiment of the device 1 is shown, wherein the device 1 can be implemented alone or in combination as a controller configuration. In this embodiment, the controller 8 is configured to detect the touch gesture 9 only when the touch gesture 9 occurs in an edge area 13 defined within an edge distance Dm from the upper edge 14 of the front screen 5 or from the lower edge 15 of the front screen 5, the upper edge 14 or the lower edge 15 being perpendicular to the scroll axis 3A. In a possible embodiment, the edge distance Dm is determined so that the edge area 13 is between 10% and 30% of the area of ​​the front screen 5, more preferably, 20% of the area of ​​the front screen 5.

[0076] Figure 6 and Figure 7 Other embodiments of the rollable display device 1 are shown, wherein the scroll unit 3 further includes: a gear 16, arranged at both ends of the scroll unit 3, for engaging the display 4; a reversible drive unit 17, for rotating the scroll unit 3 around the roller 3A in response to a control signal received from the controller 8, the control signal including instructions defining the direction and degree of the rotation. Such a reversible drive unit 17 (motor) can provide a bidirectional rotational motion to the rollable touch-sensitive display 4. The reversible drive unit 17, the gear 16 and the gear shaft together constitute the rollable touch-sensitive display 4 The rollable mechanism (scroll unit 3). The drive unit 17 can be controlled by sending a signal to achieve high-precision (up to millimeter accuracy) bidirectional rotation. The higher the voltage provided to the drive unit 17, the faster the movement of the gear shaft, thereby driving the rollable display 4 to roll faster. In addition, the curling direction, moving distance and curling speed can be controlled by providing the correct signal to the reversible drive unit 17.

[0077] In a possible embodiment, the driving unit 17 is a motor, which is used to further adjust the rotation speed of the reel unit 3 in proportion to the input voltage.

[0078] exist Figure 8 In one possible embodiment shown, the device 1 is a smart device, preferably a smart phone 18. The controller 8 shown in such an embodiment can also be used to provide a user interface 19 on the front screen 5 of the display 4, and the user interface 19 is adjusted in response to adjusting the size of the front screen. In other optional embodiments, the rollable touch-sensitive display can be part of other smart devices such as smart TVs and smart watches.

[0079] According to one possible embodiment, the controller 8 may also be used to: provide at least one visual indicator 20 in the form of a movement trajectory on the user interface 19, the movement trajectory showing the swipe direction and the minimum swipe distance Dmin required for the controller 8 to detect the touch gesture 9. The visual indicator 20 may be displayed when at least 2 fingers of the user touch the display, and the length of the visual indicator 20 may be selected to be slightly greater than half the length of the front screen 5 (>0.5L). Therefore, when the user moves his / her fingers along the entire length of the visual indicator 20, they will automatically satisfy the constraints defined above. This is also useful because the user does not have to worry about estimating the required movement distance Dmin based on the current screen length L. Since the controller 8 is able to determine the current screen length L, it can calculate the predefined distance Dmin and display a visual indicator 20 of appropriate length on the surface of the rollable touch-sensitive display 4.

[0080] In another possible embodiment, when the user touches (taps) the surface of the rollable touch-sensitive display 4 with multiple fingers, a separate virtual movement track of each finger of the user may be displayed on the display 4. These movement tracks will provide guidance for the user, as the user can simply move (i.e., swipe) his / her fingers along the movement tracks to roll the display 4.

[0081] In another alternative embodiment, the modification gesture 9 can be optionally performed for the rollable non-touch-sensitive display. In this case, the user can make the modification gesture defined by the above constraints in the air and within a predefined spacing distance from the surface of the rollable display 4.

[0082] Various aspects and implementations are described herein in conjunction with various embodiments. However, by studying the drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement other variations of the disclosed embodiments when practicing the claimed subject matter. 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 satisfy the functions of several items described in the claims. The listing of certain measures in mutually different dependent claims does not mean that the combination of these measures cannot be effectively used. The computer program may be stored / 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 via the Internet or other wired or wireless telecommunications systems.

[0083] Reference signs used in the claims should not be construed as limiting the scope.

Claims

1. A rolled display device (1), characterized in that: include: Housing (2); A reel unit (3), installed in the housing (2) and configured to rotate around a roller (3A); a flexible touch-sensitive display (4) for detecting a touch gesture and curling around the scroll unit (3) to define a flat front screen (5), the front screen size of the front screen (5) changing according to the degree of rotation of the scroll unit (3), wherein the touch gesture comprises sliding of a plurality of touch inputs (10) detected in the same direction and in a sequence immediately adjacent to each other on the front screen (5); The front screen (5) comprises a first edge (6) arranged parallel to and adjacent to the reel unit (3) and a second edge (7) arranged opposite to the first edge (6), wherein: The front screen (5) is configured to be adjusted by a controller (8) between a rolled-up state (11) and an unfolded state (12), wherein the size of the front screen is the smallest when in the rolled-up state (11), and the size of the front screen is the largest when in the unfolded state (12); The controller (8) is also used for: In response to detecting the sliding in the direction from the first edge (6) toward the second edge (7), adjusting the front screen (5) to the unfolded state (12); In response to detecting the sliding in the direction from the second edge (7) toward the first edge (6), adjusting the front screen (5) to the rolled-up state (11); A controller (8) is used to respond to a touch gesture (9) detected on the front screen (5), and simultaneously detect (201) a sliding speed S on the front screen (5), and adjust the rotation speed Sr of the scroll unit (3) according to the detected sliding speed S to adjust the rolling-up speed or unfolding speed of the display (4), thereby adjusting the size of the front screen.

2. The device (1) according to claim 1, characterized in that The plurality of touch inputs (10) include four or five touch inputs (10) detected on the front screen (5) along the same direction and in a sequence that is immediately adjacent to each other.

3. The device (1) according to claim 2, characterized in that The controller (8) is configured to detect the touch gesture (9) only in the following circumstances: detecting (102) that the sliding motion is substantially perpendicular to the roller (3A), and It is detected (104) that the sliding distance D is greater than half the length L of the front screen (5) (D>0.5L), wherein the length L is measured perpendicular to the roller (3A).

4. The device (1) according to claim 1, characterized in that The controller (8) is also used for: Detecting (103) the sliding distance D on the front screen (5); According to the detected distance D, the size of the front screen is linearly adjusted (105) to different degrees between the rolled-up state (11) and the unfolded state (12).

5. The device (1) according to any one of claims 1 to 4, characterized in that The controller (8) is used to detect the touch gesture (9) only when the touch gesture (9) appears in an edge area (13) defined within an edge distance Dm from an upper edge (14) of the front screen (5) or a lower edge (15) of the front screen (5), wherein the upper edge (14) or the lower edge (15) is perpendicular to the roller (3A); wherein: The edge distance Dm is determined so that the edge area (13) is between 10% and 30% of the area of ​​the front screen (5).

6. The device (1) according to claim 5, characterized in that The edge distance Dm is determined so that the edge area (13) is 20% of the area of ​​the front screen (5).

7. The device (1) according to any one of claims 1 to 4, characterized in that The reel unit (3) further comprises: Gears (16) are arranged at both ends of the scroll unit (3) and are used to engage the flexible touch-sensitive display (4); A reversible drive unit (17) is used to rotate the reel unit (3) around the roller (3A) in response to a control signal received from the controller (8), the control signal including instructions defining the direction and degree of the rotation.

8. The device (1) according to claim 7, characterized in that The reversible driving unit (17) is an electric motor, which is used to further adjust the rotation speed of the reel unit (3) in proportion to the input voltage.

9. The device (1) according to any one of claims 1 to 4, characterized in that The device (1) is a smart device, and the controller (8) is further configured to provide a user interface (19) on the front screen (5) of the flexible touch-sensitive display (4), wherein the user interface (19) is adjusted in response to adjusting the size of the front screen.

10. The device (1) according to claim 9, characterized in that The device (1) is a smart phone.

11. The device (1) according to claim 9, characterized in that The controller (8) is also used to provide at least one visual indicator (20) in the form of a movement trajectory on the user interface (19), wherein the movement trajectory displays the swiping direction and the minimum swiping distance Dmin required for the controller (8) to detect the touch gesture (9).

12. A method for controlling a curled display device (1), characterized in that: A device (1) according to any one of claims 1 to 11 is provided, the device (1) comprising: a scroll unit (3); a flexible touch-sensitive display (4) for detecting touch gestures and curling around the scroll unit (3) to define a flat front screen (5), the front screen (5) comprising a first edge (6) arranged parallel to and adjacent to the scroll unit (3) and a second edge (7) arranged opposite to the first edge (6), the front screen size of the front screen (5) changing according to the rotation of the scroll unit (3), wherein the front screen (5) is adjusted between a rolled-up state (11) and an unfolded state (12), wherein the front screen size is the smallest in the rolled-up state (11) and the largest in the unfolded state (12); The touch gesture comprises sliding of a plurality of touch inputs (10) detected on the front screen (5) in the same direction and in a sequence that is immediately adjacent to each other; The method comprises: In response to detecting the sliding in the direction from the first edge (6) toward the second edge (7), adjusting the front screen (5) to the unfolded state (12); In response to detecting the sliding in the direction from the second edge (7) toward the first edge (6), adjusting the front screen (5) to the rolled-up state (11); Detecting (101) a touch gesture (9) of a user on the front screen (5), and simultaneously detecting (201) a speed S of sliding on the front screen (5); The scroll unit (3) is rotated (106) in response to the detected touch gesture (9), and the rotation speed Sr of the scroll unit (3) is adjusted (202) according to the detected sliding speed S, so as to adjust the rolling-up speed or the unfolding speed of the display (4) according to the controller (8) of the device (1), thereby configuring the adjustment of the front screen size.

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