Folding track detection device, folding track detection method, and folding detection system

Abstract

The present disclosure provides a folding trajectory detection device, a folding trajectory detection method, and a folding detection system. The folding trajectory detection device is used for a folding screen, and the folding screen includes a first folding part and a second folding part that can be foldably connected. The folding trajectory detection device includes: a fixed plate, a folding plate, a laser emitting element, and a photosensitive element. The fixed plate is used to fix the first folding part, and the folding plate is connected to the fixed plate, and is used to fix the second folding part. The folding plate is folded around the first direction facing the fixed plate. The laser emitting element is arranged on the folding plate, and the laser emitting element emits laser in a direction parallel to the first direction. The photosensitive element is arranged on the side of the folding plate, and the photosensitive element includes a photosensitive layer that optically reacts when the laser is irradiated, and the photosensitive layer faces the laser and is perpendicular to the laser. The folding trajectory detection device can accurately detect the folding trajectory of the folding plate, thereby facilitating accurate folding testing of the folding screen.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic equipment, and in particular to a folding trajectory detection device and a folding trajectory detection method, and a folding detection system. Background Art

[0002] With the development of electronic devices, electronic devices with folding screens are very popular. Before the folding screen is formed into a product, it is necessary to perform a folding test on the folding screen through a folding detection system to determine the stress condition of the folding screen. Among them, the folding trajectory of the folding detection system affects the stress condition of the folding screen, and then affects the anti-folding test results of the folding screen. However, there is currently no device or method for detecting the folding trajectory of the folding detection system, which is not conducive to accurately performing a folding test on the folding screen. Based on this, it is particularly important to provide a folding trajectory detection device or method. Summary of the invention

[0003] The present invention provides a folding track detection device, a folding track detection method, and a folding detection system.

[0004] One aspect of the present disclosure provides a folding track detection device for a folding screen, wherein the folding screen includes a first folding part and a second folding part that are foldably connected, and the device includes:

[0005] A fixing plate, used for fixing the first folding portion;

[0006] A folding plate connected to the fixing plate and used to fix the second folding portion, wherein the folding plate is folded around a first direction toward the fixing plate;

[0007] A laser emitting element, disposed on the folding plate, emitting laser light in a direction parallel to the first direction; and

[0008] The photosensitive member is arranged on the side of the folding plate, and the photosensitive member includes a photosensitive layer that generates an optical reaction when irradiated by the laser, and the photosensitive layer faces the laser and is perpendicular to the laser.

[0009] Optionally, the folding plate includes a first end surface connected to the fixing plate and a second end surface opposite to the first end surface, and the distance between the laser emitting element and the first end surface is smaller than the distance between the laser emitting element and the second end surface.

[0010] Optionally, the folding plate includes a first end surface connected to the fixing plate and a second end surface opposite to the first end surface, and the distance between the laser emitting element and the first end surface is greater than the distance between the laser emitting element and the second end surface.

[0011] Optionally, the folding plate further comprises: a first plate surface facing the fixed plate, a second plate surface opposite to the first plate surface, and a first side surface, wherein the first side surface is connected to the first end surface, the second end surface, the first plate surface, and the second plate surface;

[0012] The first side surface faces the photosensitive layer, and the laser emitting element is arranged on the first side surface.

[0013] Optionally, there are multiple laser emitting elements, and the multiple laser emitting elements are dispersedly arranged on the first side surface along a direction from the first end surface to the second end surface.

[0014] Optionally, the device further comprises a distance sensor, which is arranged on the folding plate and is used to detect the distance between the folding plate and the photosensitive layer.

[0015] Optionally, the distance sensor comprises a laser distance sensor, and the laser distance sensor and the laser emitting element are integrated into one.

[0016] Optionally, the device further comprises a flexible body, and the folding plate is connected to the fixed plate via the flexible body.

[0017] Another aspect of the present disclosure provides a folding track detection method, the method is used for a folding track detection device, the folding track detection device comprises: a fixed plate, a folding plate connected to the fixed plate, a laser emitting element provided on the folding plate, and a photosensitive element provided on the side of the folding plate, the photosensitive element comprises a photosensitive layer; the fixed plate is used to fix a first folding portion of a folding screen, the folding plate is used to fix a second folding portion of the folding screen, the first folding portion and the second folding portion are foldably connected; the method comprises:

[0018] Controlling the folding plate to fold around the first direction toward the fixed plate, so that the second folding portion folds toward the first folding portion;

[0019] During the folding process of the folding plate, the laser emitting element is controlled to emit laser light toward the photosensitive layer in a direction parallel to the first direction, wherein the laser light is perpendicular to the photosensitive layer, so that the photosensitive layer undergoes an optical reaction and forms a reaction track;

[0020] The folding trajectory of the folding plate is determined according to the reaction trajectory.

[0021] Optionally, the device further comprises a distance sensor provided on the folding plate, and the method further comprises:

[0022] The distance between the folding plate and the photosensitive layer is detected by the distance sensor to determine the relative position between the folding plate and the photosensitive layer.

[0023] Another aspect of the present disclosure provides a folding detection system, which includes any one of the folding trajectory detection devices mentioned above.

[0024] The technical solution provided by the present disclosure has at least the following beneficial effects:

[0025] Based on the folding of the folding plate around the first direction, the laser emitting element is arranged on the folding plate, and the laser emitting element emits laser to the photosensitive layer in a direction parallel to the first direction, and the laser is perpendicular to the photosensitive layer, so that the moving track of the laser on the photosensitive layer is the same as the folding track of the folding plate. Under the condition of laser irradiation, the photosensitive layer reacts to form a reaction track, and the reaction track is the same as the moving track of the laser. Based on the reaction track, the folding track of the folding plate can be determined, and the force condition of the folding screen can be accurately determined through the folding track of the folding plate, which is conducive to accurately performing a folding test on the folding screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. 1 is a schematic structural diagram of a folding trajectory detection device according to an exemplary embodiment of the present disclosure;

[0027] Figure 2 FIG. 1 is a schematic structural diagram of a folding trajectory detection device according to an exemplary embodiment of the present disclosure;

[0028] Figure 3 FIG. 1 is a top view of a folding track detection device according to an exemplary embodiment of the present disclosure;

[0029] Figure 4 FIG. 1 is a partial structural schematic diagram of a folding trajectory detection device according to an exemplary embodiment of the present disclosure;

[0030] Figure 5 Shown is a side view of a folding plate according to an exemplary embodiment of the present disclosure when folded;

[0031] Figure 6 Shown is a schematic diagram of a reaction trajectory of an optical reaction of a photosensitive layer according to an exemplary embodiment of the present disclosure;

[0032] Figure 7 It is a schematic diagram showing the relative positions of the folding plate, the fixing plate and the laser emitting element according to an exemplary embodiment of the present disclosure;

[0033] Figure 8 It is a schematic diagram showing the relative positions of the folding plate, the fixing plate and the laser emitting element according to an exemplary embodiment of the present disclosure;

[0034] Fig. 9 FIG. 4 is a flow chart of a folding track detection method according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0036] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. Unless otherwise specified, similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect.

[0037] As used in this disclosure and the appended claims, the singular forms "a", "an", "said", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

[0038] In some embodiments, the folding detection system includes a fixed plate and a folding plate connected to the fixed plate, and the folding plate can be folded toward the fixed plate. The folding screen includes at least one folding unit, and the folding unit includes a first folding part and a second folding part that can be foldably connected. By fixing the first folding part to the fixed plate and the second folding part to the folding plate, the folding plate is controlled to fold toward the fixed plate, which drives the second folding part to fold toward the first folding part, so as to perform a folding test on the folding screen. The force on the folding plate is used to determine the force on the folding screen, and then determine whether the folding screen meets the folding test requirements.

[0039] However, the stress condition of the folding screen is related to the folding trajectory of the folding plate. If the folding trajectory of the folding plate cannot be determined, it cannot be ensured that the external force applied to the folding screen during the folding process is the same as the preset external force. This makes the folding detection system unable to accurately detect the stress condition of the folding screen, which is not conducive to accurate folding testing of the folding screen.

[0040] In order to solve the above problems, the embodiments of the present disclosure provide a folding trajectory detection device, a folding trajectory detection method, and a folding detection system.

[0041] The folding detection system provided in some embodiments of the present disclosure includes a folding trajectory detection device, the folding detection system is used to detect the anti-folding performance of the folding screen, etc., and the folding trajectory detection device is used to detect the folding trajectory of the folding plate.

[0042] Figure 1 FIG. 1 is a schematic diagram of a folding track detection device according to an exemplary embodiment of the present disclosure. Figure 2 FIG. 1 is a schematic diagram of a folding track detection device according to an exemplary embodiment of the present disclosure. Figure 3 FIG. 1 is a top view of a folding track detection device according to an exemplary embodiment of the present disclosure. Figures 1 to 3 The folding track detection device includes: a fixing plate 110, a folding plate 120, a laser emitting element 130 and a photosensitive element 140. The folding track detection device is used for a folding screen, and the folding screen includes a first folding part 210 and a second folding part 220 that can be foldably connected.

[0043] The position of the fixing plate 110 relative to the folding plate 120 remains unchanged, and the fixing plate 110 can be fixed to a platform or a bracket. For example, the fixing plate 110 can be a rigid plate to facilitate the cooperation with the folding plate 120 to clamp the folding screen. The fixing plate 110 is used to fix the first folding portion 210. For example, the first folding portion 210 is attached to the fixing plate 110.

[0044] The folding plate 120 is connected to the fixed plate 110, and the folding plate 120 is used to fix the second folding portion 220. The folding plate 120 is folded around the first direction 101 facing the fixed plate 110, so that the second folding portion 220 is folded around the first direction 101 toward the first folding portion 210. Exemplarily, the second folding portion 220 is attached to the folding plate 120. It can be understood that the first direction 101 is the extension direction of the connection between the folding plate 120 and the fixed plate 110. Exemplarily, the folding plate 120 is a rigid plate and will not deform when folded. Exemplarily, the folding plate 120 and the fixed plate 110 are connected by a rotating shaft, then the first direction 101 is parallel to or coincides with the axial direction of the rotating shaft. Figure 4 FIG. 1 is a partial structural diagram of a folding track detection device according to an exemplary embodiment of the present disclosure. Figure 4 The folding track detection device further includes a flexible body 150, and the folding plate 120 is connected to the fixed plate 110 through the flexible body 150. In this way, the folding plate 120 is folded toward the fixed plate 110 through the flexible body 150, and then the axis corresponding to the bending arc of the flexible body 150 is parallel to or coincides with the first direction 101. Figure 4 In FIG. 1 , a plurality of dotted lines represent the bending shape of the flexible body 150 . The width of the flexible body 150 can be considered as πR0. When the flexible body 150 is bent into a semicircular arc, the radius of the semicircular arc is R0.

[0045] Continue to refer Figure 1 The laser emitting element 130 is disposed on the folding plate 120, and the laser emitting element 130 emits a laser 131 in a direction parallel to the first direction 101. When the folding plate 120 is folded, the position of the laser emitting element 130 changes with the folding of the folding plate 120, and the laser emitting element 130 emits the laser 131 in a direction parallel to the first direction 101, and the folding trajectory of the folding plate 120 can be determined by the moving trajectory of the laser 131.

[0046] The photosensitive member 140 is disposed on the side of the folding plate 120. The photosensitive member 140 includes a photosensitive layer 141 that undergoes an optical reaction when irradiated by the laser 131. The photosensitive layer 141 faces the laser 131 and is perpendicular to the laser 131. Exemplarily, the photosensitive layer 141 includes a polymer material that can undergo a photosensitive reaction under laser irradiation and form a reaction track. There may be a reference spacing between the photosensitive member 140 and the folding plate 120. Exemplarily, the photosensitive member 140 includes photosensitive paper, and the photosensitive paper includes a paper substrate 142 and a photosensitive layer 141 disposed on the paper substrate 142. Exemplarily, the photosensitive member 140 may be fixed to the side of the folding plate 120 by a bracket.

[0047] Figure 5 FIG. 1 is a side view of a folding plate 120 according to an exemplary embodiment of the present disclosure when folded. Figure 6 FIG. 1 is a schematic diagram of a reaction trajectory 102 of an optical reaction of a photosensitive layer 141 according to an exemplary embodiment of the present disclosure. Figure 1 , Figure 5 and Figure 6 When the flap 120 is folded, the laser emitting element 130 on the flap 120 emits the laser 131 to the photosensitive layer 141, and the photosensitive layer 141 undergoes an optical reaction under the action of the laser 131. In this way, the laser 131 will undergo an optical reaction at the moving track on the photosensitive layer 141 to form a reaction track 102, and the folding track of the flap 120 can be determined based on the reaction track 102.

[0048] Based on the above, the folding trajectory detection device provided by the embodiment of the present disclosure is based on the first folding part 210 being fixed to the fixed plate 110, and the second folding part 220 being fixed to the folding plate 120. When the folding plate 120 is folded, the first folding part 210 is driven to fold. Based on the folding plate 120 being folded around the first direction 101, the laser emitting element 130 is disposed on the folding plate 120. The laser emitting element 130 emits a laser 131 toward the photosensitive layer 141 in a direction parallel to the first direction 101, and the laser 131 is perpendicular to the photosensitive layer 141. In this way, the moving trajectory of the laser 131 on the photosensitive layer 141 is the same as the folding trajectory of the folding plate 120. Under the condition of irradiation of laser 131, the photosensitive layer 141 undergoes an optical reaction to form a reaction trajectory 102, and the reaction trajectory 102 is the same as the moving trajectory of the laser 131. The folding trajectory of the folding plate 120 can be determined based on the reaction trajectory 102. The stress condition of the folding screen can be accurately determined through the folding trajectory of the folding plate 120, which is conducive to accurate folding testing of the folding screen.

[0049] Figure 7 FIG. 1 is a schematic diagram showing the relative positions of the folding plate 120, the fixing plate 110 and the laser emitting element 130 according to an exemplary embodiment of the present disclosure. Figure 7 The folding plate 120 includes a first end surface 121 connected to the fixing plate 110 and a second end surface 122 opposite to the first end surface 121. The distance between the laser emitting element 130 and the first end surface 121 is greater than the distance between the laser emitting element 130 and the second end surface 122. In other words, the laser emitting element 130 is arranged close to the second end surface 122. In this way, the folding track of the folding plate 120 close to the second end surface 122 can be accurately detected by the laser emitting element 130. The area formed by the folding track is relatively large. Accordingly, the photosensitive element 140 can be arranged to have a relatively large area.

[0050] Figure 8 FIG. 1 is a schematic diagram showing the relative positions of the folding plate 120, the fixing plate 110 and the laser emitting element 130 according to an exemplary embodiment of the present disclosure. Figure 8 The folding plate 120 includes a first end surface 121 connected to the fixing plate 110 and a second end surface 122 opposite to the first end surface 121. The distance between the laser emitting element 130 and the first end surface 121 is smaller than the distance between the laser emitting element 130 and the second end surface 122. In other words, the laser emitting element 130 is arranged close to the first end surface 121. In this way, the folding track of the folding plate 120 close to the first end surface 121 can be accurately detected by the laser emitting element 130. The area formed by the folding track is small, and accordingly, the photosensitive element 140 can be arranged to have a small area.

[0051] In the embodiment of the present disclosure, the laser emitting element 130 can be disposed at multiple positions of the folding plate 120. Figure 7 or Figure 8 The folding plate 120 also includes: a first plate surface 123 facing the fixed plate 110, a second plate surface 124 opposite to the first plate surface 123, and a first side surface 125, the first side surface 125 is connected to the first end surface 121, the second end surface 122, the first plate surface 123, and the second plate surface 124; the first side surface 125 faces the photosensitive layer 141, and the laser emitting element 130 is arranged on the first side surface 125. It can be understood that the laser emitting element 130 emits the laser 131 vertically from the first side surface 125 to the photosensitive layer 141. Such an arrangement avoids the laser emitting element 130 from affecting the force applied by the folding plate 120 to the folding screen, and it is easy to arrange the laser emitting element 130 and the photosensitive element 140 relative to each other.

[0052] Exemplarily, the first side surface 125 is provided with a groove, and the laser emitting element 130 is assembled in the groove. Exemplarily, the first side surface 125 is a planar structure, and the laser emitting element 130 is fixed to the first side surface 125 by an adhesive layer or a fixing element.

[0053] In some embodiments, there are multiple laser emitting elements 130, and the multiple laser emitting elements 130 are dispersedly arranged on the first side surface 125 along the direction from the first end surface 121 to the second end surface 122. In this way, the cooperation of multiple laser emitting elements 130 is more conducive to accurately determining the folding trajectory of the folding plate 120. Exemplarily, among the multiple laser emitting elements 130, one laser emitting element 130 is arranged close to the first end surface 121. Exemplarily, among the multiple laser emitting elements 130, one laser emitting element 130 is arranged close to the first end surface 121, and one laser emitting element 130 is arranged close to the second end surface 122.

[0054] When controlling the folding plate 120 to fold, if the folding plate 120 moves toward or away from the photosensitive member 140, or the folding plate 120 is tilted so that the laser 131 is not perpendicular to the photosensitive layer 141, this will affect the reaction trajectory 102 of the optical reaction of the photosensitive layer 141, which is not conducive to accurately determining the folding trajectory of the folding plate 120. In order to solve this problem, in some embodiments, continue to refer to Figure 7, the folding track detection device provided in some embodiments of the present disclosure further includes a distance sensor 160, which is disposed on the folding plate 120 and is used to detect the distance between the folding plate 120 and the photosensitive layer 141. In this way, according to the distance between the folding plate 120 and the photosensitive layer 141 detected by the distance sensor 160, it is determined whether the folding plate 120 and the photosensitive member 140 are relatively displaced during the folding process, and then it is determined whether the folding track is accurate. In addition, before using the folding track detection device provided in the embodiments of the present disclosure for detection, the positions of the folding plate 120 and the fixed plate 110 can be adjusted according to the distance detected by the distance sensor 160.

[0055] Exemplarily, the distance sensor 160 includes a laser distance sensor, an infrared distance sensor, or an ultrasonic distance sensor.

[0056] In some embodiments, the distance sensor 160 includes a laser distance sensor, and the laser distance sensor 160 and the laser emitting element 130 are integrated into one. Exemplarily, the laser distance sensor includes a laser emitting end and a laser receiving end, and the laser emitting end is used to emit the laser 131 to the photosensitive layer 141, so that an optical reaction occurs between the laser 131 and the photosensitive layer 141. The laser receiving end is used to receive the laser 131 reflected by the photosensitive element 140. It can be understood that the laser 131 emitted to the photosensitive layer 141 is sufficient to cause the photosensitive layer 141 to have an optical reaction, and can be reflected to the laser receiving end. Based on the time when the laser emitting end emits the laser 131 and the laser receiving end receives the laser 131, as well as the propagation speed of the laser 131, the distance between the folding plate 120 and the photosensitive element 140 can be determined, and then the relative position between the folding plate 120 and the photosensitive layer 141 can be determined. Among them, the relative position between the folding plate 120 and the photosensitive layer 141 can be considered as the relative position between the first side 125 and the photosensitive layer 141, for example: the distance between the first side 125 and the photosensitive layer 141 decreases, the distance between the first side 125 and the photosensitive layer 141 increases, or the angle between the first side 125 and the photosensitive layer 141 changes.

[0057] Fig. 9 The flowchart of the folding track detection method according to an exemplary embodiment of the present disclosure is shown. Some embodiments of the present disclosure also provide a folding track detection method, which is used in a folding track detection device, and the folding track detection device includes: a fixed plate, a folding plate connected to the fixed plate, a laser emitting element provided on the folding plate, and a photosensitive element provided on the side of the folding plate, and the photosensitive element includes a photosensitive layer. The fixed plate is used to fix the first folding part of the folding screen, and the folding plate is used to fix the second folding part of the folding screen. The first folding part and the second folding part can be foldably connected. Reference Fig. 9 , the method comprising:

[0058] Step 91, controlling the folding plate to fold toward the fixed plate around the first direction, so that the second folding portion folds toward the first folding portion.

[0059] Specifically, the folding plate can be driven to fold accurately by the driving member of the folding detection system.

[0060] Step 92: During the folding process of the folding plate, the laser emitting element is controlled to emit laser light toward the photosensitive layer in a direction parallel to the first direction, with the laser light being perpendicular to the photosensitive layer, so that the photosensitive layer undergoes an optical reaction and forms a reaction track.

[0061] Step 93: Determine the folding trajectory of the folding plate according to the reaction trajectory.

[0062] Based on the previous description of the folding trajectory detection device, it can be seen that the reaction trajectory is used to represent the folding trajectory of the folding screen.

[0063] In some embodiments, the folding track detection device further includes a distance sensor disposed on the folding plate, and the folding track detection method further includes:

[0064] The distance sensor detects the distance between the folding plate and the photosensitive layer to determine the relative position between the folding plate and the photosensitive layer. In this way, the relative position between the folding plate and the photosensitive layer is ensured to remain unchanged, and then the folding trajectory of the folding screen is accurately determined according to the reaction trajectory.

[0065] The folding trajectory detection method provided by the embodiment of the present disclosure is based on that the first folding part is fixed to the fixed plate, and the second folding part is fixed to the folding plate. When the folding plate is folded, the first folding part is driven to fold. Based on the folding plate folding around the first direction, the laser emitting component is arranged on the folding plate, and the laser emitting component emits laser to the photosensitive layer in a direction parallel to the first direction, and the laser is perpendicular to the photosensitive layer, so that the moving trajectory of the laser on the photosensitive layer is the same as the folding trajectory of the folding plate. Under the condition of laser irradiation, the photosensitive layer undergoes an optical reaction to form a reaction trajectory, and the reaction trajectory is the same as the moving trajectory of the laser. The folding trajectory of the folding plate can be determined based on the reaction trajectory, and the force condition of the folding screen can be accurately determined through the folding trajectory of the folding plate, which is conducive to accurately performing a folding test on the folding screen.

[0066] As for the method embodiment, since it basically corresponds to the device embodiment, the relevant parts can be referred to the partial description of the device embodiment. The method embodiment and the device embodiment complement each other.

[0067] The above-mentioned various embodiments of the present disclosure may complement each other if no conflict occurs.

[0068] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A folding trajectory detection device, characterized in that: The device is used for performing a folding test on a folding screen before the folding screen is formed into a product, wherein the folding screen comprises a first folding part and a second folding part which can be foldably connected, and the device comprises: A fixing plate, used for fixing the first folding portion; A folding plate connected to the fixing plate and used to fix the second folding portion, wherein the folding plate is folded around a first direction toward the fixing plate; A laser emitting element, disposed on the folding plate, emitting laser light in a direction parallel to the first direction; and The photosensitive member is arranged on the side of the folding plate, and the photosensitive member includes a photosensitive layer that generates an optical reaction when irradiated by the laser, and the photosensitive layer faces the laser and is perpendicular to the laser.

2. The device according to claim 1, characterized in that The folding plate includes a first end surface connected to the fixing plate and a second end surface opposite to the first end surface, and the distance between the laser emitting element and the first end surface is smaller than the distance between the laser emitting element and the second end surface.

3. The device according to claim 1, characterized in that The folding plate includes a first end surface connected to the fixing plate and a second end surface opposite to the first end surface, and the distance between the laser emitting element and the first end surface is greater than the distance between the laser emitting element and the second end surface.

4. The device according to claim 2 or 3, characterized in that The folding plate further comprises: a first plate surface facing the fixed plate, a second plate surface opposite to the first plate surface, and a first side surface, wherein the first side surface is connected to the first end surface, the second end surface, the first plate surface, and the second plate surface; The first side surface faces the photosensitive layer, and the laser emitting element is arranged on the first side surface.

5. The device according to claim 4, characterized in that There are multiple laser emitting elements, and the multiple laser emitting elements are dispersedly arranged on the first side surface along a direction from the first end surface to the second end surface.

6. The device according to claim 1, characterized in that The device further comprises a distance sensor, which is arranged on the folding plate and is used for detecting the distance between the folding plate and the photosensitive layer.

7. The device according to claim 6, characterized in that The distance sensor comprises a laser distance sensor, and the laser distance sensor and the laser emitting element are integrated into one.

8. The device according to claim 1, characterized in that The device also includes a flexible body, and the folding plate is connected to the fixing plate via the flexible body.

9. A folding trajectory detection method, characterized in that: The method is used for the folding track detection device according to any one of claims 1 to 8, the folding track detection device comprising: a fixed plate, a folding plate connected to the fixed plate, a laser emitting element arranged on the folding plate, and a photosensitive element arranged on the side of the folding plate, the photosensitive element comprising a photosensitive layer; the fixed plate is used to fix the first folding part of the folding screen, the folding plate is used to fix the second folding part of the folding screen, the first folding part and the second folding part are foldably connected; the method comprises: Controlling the folding plate to fold around the first direction toward the fixed plate, so that the second folding portion folds toward the first folding portion; During the folding process of the folding plate, the laser emitting element is controlled to emit laser light toward the photosensitive layer in a direction parallel to the first direction, wherein the laser light is perpendicular to the photosensitive layer, so that the photosensitive layer undergoes an optical reaction and forms a reaction track; The folding trajectory of the folding plate is determined according to the reaction trajectory.

10. The method according to claim 9, characterized in that The device further includes a distance sensor disposed on the folding plate, and the method further includes: The distance between the folding plate and the photosensitive layer is detected by the distance sensor to determine the relative position between the folding plate and the photosensitive layer.

11. A folding detection system, characterized in that: The folding detection system comprises the folding trajectory detection device according to any one of claims 1 to 8.

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