Foldable display screen and electronic device

Abstract

The application discloses a foldable display screen and electronic equipment, and belongs to the technical field of display. The foldable display screen comprises a flexible display module, the flexible display module comprises at least one bendable display group, each bendable display group comprises two flat areas arranged at intervals along a first direction and a bending area connecting the two flat areas, and each bendable display group is provided with at least one first light sensing element and at least one second light sensing element; the first light sensing element is arranged on the bending area, the second light sensing element is arranged on any flat area, or; the first light sensing element and the second light sensing element are both arranged on the bending area, and the polarization direction of the ambient light collected by the first light sensing element is different from the polarization direction of the ambient light collected by the second light sensing element. The application solves the technical problems of the foldable screen device, such as the absence of fold mark detection technology and the lack of independent self-checking capability.

Description

Technical Field

[0001] This invention belongs to the field of display technology, and particularly relates to a foldable display screen and electronic device. Background Technology

[0002] With the rapid iteration of flexible display technology, foldable screens, with their unique advantages of flexible form and large-screen interaction, have become the mainstream development direction in the field of smart terminals. Foldable screen devices rely on the bendable characteristics of flexible screens to achieve a balance between portability and large-screen display effects, and are widely used in various smart products such as mobile phones, tablets, and wearable devices.

[0003] The flexible display module of a foldable screen is composed of stacked film materials. When applied to foldable displays, this module frequently needs to switch between unfolded and folded states. Current industry solutions for foldable screen creases primarily focus on passive optimization methods such as improving flexible materials, optimizing hinge structures, upgrading screen coatings, and dispersing bending stress. These methods can only mitigate the visual effect of creases to a certain extent. Current foldable screen devices suffer from technical shortcomings such as a lack of crease detection technology and the absence of self-inspection capabilities. The industry urgently needs a technical solution that can accurately quantify creases and achieve crease self-inspection. Summary of the Invention

[0004] This invention provides a foldable display screen and electronic device to solve the technical problems of the lack of crease detection technology and the absence of autonomous self-inspection capabilities in current foldable screen devices.

[0005] In a first aspect of the present invention, a foldable display screen is provided, comprising: a flexible display module including at least one bendable display group, each bendable display group including two flat areas spaced apart along a first direction and a bendable area connecting the two flat areas, each bendable display group being provided with at least one first light-sensing element and at least one second light-sensing element; the first light-sensing element is disposed in the bendable area, and the second light-sensing element is disposed in either of the flat areas, or; both the first light-sensing element and the second light-sensing element are disposed in the bendable area, and the polarization direction of the ambient light collected by the first light-sensing element is different from the polarization direction of the ambient light collected by the second light-sensing element.

[0006] In conjunction with the first aspect, in some embodiments, the number of the first photosensitive elements is M, and the M first photosensitive elements are arranged at intervals along the first direction, where M is an integer greater than or equal to 3.

[0007] In conjunction with the first aspect, in some embodiments, each of the bendable display groups is further provided with at least one third light-sensing element; the third light-sensing element is disposed in the bending area, the first light-sensing element and the third light-sensing element are arranged at intervals along a second direction, the first light-sensing element is disposed at the middle position of the bending area along the second direction, and the second direction is perpendicular to the first direction.

[0008] In conjunction with the first aspect, in some embodiments, the number of the third photosensitive elements is N, and the N third photosensitive elements are arranged at intervals along the second direction, where N is an integer greater than 2.

[0009] In conjunction with the first aspect, in some embodiments, the second photosensitive element is disposed in the bending region; a first polarizing film is disposed on one side of the photosensitive surface of the first photosensitive element; a second polarizing film is disposed on one side of the photosensitive surface of the second photosensitive element, wherein the polarization direction of the first polarizing film differs from the polarization direction of the second polarizing film by 90°.

[0010] In conjunction with the first aspect, in some embodiments, the flexible display module includes a flexible display panel and a back plate, the back plate being disposed on the back side of the flexible display panel, the back plate including a bendable area located in the bending region and a non-bendable area located in the flat region, the bendable area being provided with a cutout opening; the foldable display screen further includes a support structure, the support structure being disposed on the side of the back plate away from the flexible display panel, the first light-sensing element being integrated into the support structure, and the orthographic projection of the first light-sensing element on the back plate being located in the bendable area of ​​the back plate.

[0011] In a second aspect of the present invention, an electronic device is provided, comprising: a foldable display screen as described in any embodiment of the first aspect; and a processing device connected to the first light sensing element and the second light sensing element, configured to determine a crease detection result of the bending area in a first direction based on the light intensity detected by the first light sensing element and the light intensity detected by the second light sensing element, wherein the first direction is a direction perpendicular to the bending axis of the bending area.

[0012] In conjunction with the second aspect, in some embodiments, each of the first photosensitive elements corresponds to a crease position in the bending area; the processing device is configured to: determine the crease slope of the crease position in the first direction based on the light intensity detected by the first photosensitive element disposed opposite to the crease position, the light intensity detected by the second photosensitive element, and a pre-calibrated variation relationship, wherein the variation relationship is the relationship between the light intensity of ambient light transmitted through the flat area and the light intensity of ambient light transmitted through the bending area as a function of the crease slope.

[0013] In conjunction with the second aspect, in some embodiments, the processing device is configured to: determine the crease depth of the crease location in the first direction based on the crease slope of the crease location in the first direction and the position parameter of the first photosensitive element; wherein the position parameter is the distance between the location of the first photosensitive element and the bending axis of the bending area.

[0014] In conjunction with the second aspect, in some embodiments, the number of the first photosensitive elements is M, and the M first photosensitive elements are arranged at intervals along the first direction, where M is an integer greater than or equal to 3. The processing device is further configured to: The crease morphology of the bending area in the first direction is determined based on the crease slope of the M crease positions opposite to the M first photosensitive elements in the first direction.

[0015] In conjunction with the second aspect, in some embodiments, each of the bendable display groups is further provided with at least one third photosensitive element, the third photosensitive element being disposed in the bending area, the first photosensitive element and the third photosensitive element being arranged at intervals along a second direction, the first photosensitive element being disposed at the middle position of the bending area along the second direction, the second direction being perpendicular to the first direction; the processing device is connected to the third photosensitive element, and the processing device is further configured to: determine the crease detection result of the bending area in the second direction based on the light intensity detected by the third photosensitive element and the light intensity detected by the first photosensitive element.

[0016] In conjunction with the second aspect, in some embodiments, each of the third photosensitive elements corresponds to a crease position of the bending area; the processing device is configured to: determine the crease slope of the crease position in the second direction based on the light intensity detected by the third photosensitive element disposed opposite to the crease position, the light intensity detected by the first photosensitive element, and a pre-calibrated variation relationship; wherein the variation relationship is the relationship between the light intensity of ambient light transmitted through the flat area, the light intensity of ambient light transmitted through the bending area and the crease slope, or the relationship between the light intensity of two polarization directions transmitted through the bending area and the crease slope.

[0017] In conjunction with the second aspect, in some embodiments, the processing device is configured to: determine the crease depth of the crease location in the second direction based on the crease slope of the crease location in the second direction and the position parameter of the third photosensitive element, wherein the position parameter is the distance between the setting position of the third photosensitive element and the first photosensitive element.

[0018] In conjunction with the second aspect, in some embodiments, the number of the third photosensitive elements is N, and the N third photosensitive elements are arranged at intervals along the second direction, where N is an integer greater than 2; the processing device is further configured to: determine the crease morphology of the bending area in the second direction based on the crease slope of the N crease positions opposite to the N third photosensitive elements in the second direction.

[0019] The technical effects or advantages achieved by one or more technical solutions provided in the embodiments of the present invention are at least as follows: By placing a first photosensitive element in the bending area of ​​the flexible display module and a second photosensitive element in any flat area of ​​the flexible display module, or by placing both the first and second photosensitive elements in the bending area of ​​the flexible display module, and by ensuring that the polarization direction of the ambient light collected by the first photosensitive element is different from that collected by the second photosensitive element, the light intensity detected by the first and second photosensitive elements under the same ambient light source will differ. This allows the crease detection result in the first direction of the bending area to be determined using the light intensity detected by the first and second photosensitive elements, enabling precise quantification of creases in the foldable display screen and achieving crease self-inspection of the foldable display screen. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1A A schematic diagram showing the arrangement of the first and second light-sensing elements of a foldable display screen according to some embodiments of the present invention is shown. Figure 1B It shows Figure 1A Side view of the placement of the first and second light sensors in the foldable display screen; Figure 2 It shows Figure 1A A schematic diagram of the crease morphology of a flexible display module in the first and second directions; Figure 3 A schematic diagram of the back panel of a foldable display screen in some embodiments of the present invention is shown; Figure 4A A schematic diagram showing the arrangement of the first and second light-sensing elements of the foldable display screen according to other embodiments of the present invention is shown; Figure 4B It shows Figure 4A Side view of the placement of the first and second light sensors in the foldable display screen; Figure 5A A schematic diagram showing the arrangement of the first and second light-sensing elements of the foldable display screen according to some embodiments of the present invention is shown; Figure 5B It shows Figure 5A Side view of the placement of the first and second light sensors in the foldable display screen; Figure 6 A schematic diagram showing the arrangement of the first, second, and third light-sensing elements of a foldable display screen according to some embodiments of the present invention is shown. Figure 7 A schematic diagram showing the arrangement of the first, second, and third light-sensing elements of the foldable display screen according to other embodiments of the present invention is shown. Figure 8 A schematic diagram showing the arrangement of the first, second, and third light-sensing elements of the foldable display screen according to some embodiments of the present invention is shown. Figure 9 A schematic diagram showing the arrangement of the first and second light-sensing elements of the foldable display screen according to some embodiments of the present invention is shown; Figure 10 A schematic diagram showing the arrangement of the first and second light-sensing elements of the foldable display screen according to some embodiments of the present invention is shown; Figure 11 A schematic diagram of the structure of an electronic device according to some embodiments of the present invention is shown; Figure 12 The difference in light intensity received by the flat and bent areas of the flexible display module under the same light source is shown. Figure 13 A schematic diagram is shown of the crease slope and crease depth in the first direction, and the position parameters of the first photosensitive element in an embodiment of the present invention. Figure 14 The crease morphology of the foldable display screen in the first direction is shown in an embodiment of the present invention; Figure 15 The three-dimensional crease morphology of the foldable display screen in an embodiment of the present invention is shown. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the embodiments of this specification, the term "multiple" means "two or more", that is, including two or more cases; the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0024] This invention provides a foldable display screen. Figure 1A A schematic diagram showing the arrangement of the first and second light-sensing elements of a foldable display screen according to some embodiments of the present invention is shown. Figure 1B It shows Figure 1A A side view showing the placement of the first and second light sensors in a foldable display screen. Figure 1A and Figure 1B As shown, the foldable display screen 100 provided in this embodiment of the invention includes a flexible display module 110. Each flexible display module 110 includes at least one bendable display group 110-1, and each bendable display group 110-1 includes two flat areas 110a arranged at intervals along a first direction and a bendable area 110b connecting the two flat areas 110a. At least one first light-sensing element 120 and at least one second light-sensing element 130 are disposed on the back side of each bendable display group 110-1.

[0025] In some embodiments, a first photosensitive element 120 is disposed in a bending region 110b, and a second photosensitive element 130 is disposed in any flat region 110a. The orthographic projection of the first photosensitive element 120 onto the flexible display module 110 is located in the bending region 110b, and the orthographic projection of the second photosensitive element 130 onto the flexible display module 110 is located in the flat region 110a.

[0026] In some embodiments, the first photosensitive element 120 and the second photosensitive element 130 are both photosensitive elements, such as photodiodes. The first photosensitive element 120 and the second photosensitive element 130 can be integrated into the stacked structure of the flexible display module 110, wherein the first photosensitive element 120 is integrated in the bending region 110b and the second photosensitive element 130 is integrated in the flat region 110a.

[0027] In some other embodiments, the first light sensing element 120 and the second light sensing element 130 are both ambient light sensors that integrate a photosensitive element, a signal processing circuit and an auxiliary circuit. The first light sensing element 120 is disposed at a first under-screen position k1 opposite to the bending area 110b of the bendable display group 110-1, and the second light sensing element 130 is disposed at a second under-screen position k2 opposite to any flat area 110a of the bendable display group 110-1.

[0028] In this embodiment of the invention, the light intensity detected by each first photosensitive element 120 and each second photosensitive element 130 disposed on the back side of each bendable display group 110-1 is used to jointly determine the crease detection result of the bending area 110b in the first direction. The crease detection result of the bending area 110b in the first direction may include: at least one crease position of the bending area 110b, the crease slope and / or the crease depth in the first direction, wherein the crease position is the position of the bending area 110b relative to the first photosensitive element 120. The crease detection result of the bending area 110b in the first direction may also include the crease morphology of the bending area 110b in the first direction.

[0029] Figure 2 It shows Figure 1A A schematic diagram of the crease morphology of the flexible display module in the first and second directions. (See diagram below.) Figure 2 As shown, the first direction is Figure 2 The X direction, which is along the short side of the bending region 110b, in other words, the first direction is the direction perpendicular to the bending axis L of the bending region 110b.

[0030] In some embodiments, the stacked structure of the flexible display module 110 includes a flexible display panel 111 and a back plate 112, and the foldable display screen further includes a support structure 140. The back plate 112 is disposed on the back side of the flexible display panel 111, and the support structure 140 is disposed on the side surface of the back plate 112 away from the flexible display panel 111. The back plate 112 includes a bendable region 1121 located in the bending region 110b and a non-bendable region 1122 located in the flat region 110a. A first photosensitive element 120 is integrated into the support structure 140, and the orthographic projection of the first photosensitive element 120 on the back plate 112 is located in the bendable region 1121 of the back plate 112. The first under-screen position k1 and the second under-screen position k2 are both located on the side of the back plate 112 away from the flexible display panel 111. The flexible display panel 111 incorporates electroluminescent devices, such as organic light-emitting diodes (OLEDs), tandom OLEDs, quantum dot OLEDs, light-emitting diodes (LEDs), or micro-LEDs (including mini-LEDs or micro-LEDs), depending on the specific product requirements. The layered structure of the flexible display panel 111 can be referenced from relevant technologies for flexible OLEDs (Organic Light-Emitting Diodes), and will not be elaborated upon here for the sake of brevity.

[0031] Figure 3 A schematic diagram of the back panel of a foldable display screen in some embodiments of the present invention is shown. For example... Figure 3 As shown, the back panel 112 includes a bendable region 1121 located in the bending region 110b and a non-bending region 1122 located in the flat region 110a. The bendable region 1121 is provided with a hollow opening. Specifically, the bendable region 1121 can be in the form of a grid. In related technologies, the bendable region 1121 with a hollow opening is provided to weaken the stress concentration in the bending region, optimize the bending ability, and reduce the probability of fracture failure. The first screen lower position k1 is located in the support structure 140 and is positioned opposite to the bendable region 1121 of the back panel 112. This allows light to pass through using the hollow opening of the back panel 112, enabling the first light-sensing element 120 located at the first screen lower position k1 below the bending region 110b to detect ambient light. Thus, the hollow opening of the bendable region 1121 of the back panel 112 is reused, and it is not necessary to separately open a light-transmitting hole for the first light-sensing element 120 on the back panel 112.

[0032] It is understood that a light-transmitting channel is provided at the position opposite to the first light-sensing element 120 and the second light-sensing element 130 on the flexible display panel 111, so that ambient light incident from the front of the flexible display module can pass through the light-transmitting channel of the flexible display panel 111 and the hollow opening on the back panel, and then be detected by the first light-sensing element 120 and the second light-sensing element 130.

[0033] In some embodiments, the second under-screen position k2 can be located below the flat area 110a of the flexible display module 110, where a reserved mounting position for the camera is located, so that the second light sensor 130 located at the second under-screen position k2 below the flat area 110a can detect ambient light. It should be noted that only one second light sensor 130 needs to be provided.

[0034] like Figure 3 As shown, in some other embodiments, the second screen under position k2 can be located at any position opposite to the flat area 110a. A hollow opening 1122-1 is provided in a local area of ​​the non-bending area 1122 of the back plate 112 opposite to the second screen under position k2 to allow light to pass through, so that the second light sensing element 130 disposed at the second screen under position k2 can detect ambient light.

[0035] In some embodiments, the support structure 140 includes at least two support plates 141, and each pair of adjacent support plates 141 are connected by a hinge 142. Each folded display group includes the following layers from top to bottom: a flexible display area belonging to the flexible display panel 111, a back plate area belonging to the back plate 112, and a support layer belonging to the support structure 140. The support layer of each folded display group includes a first support plate 141, a second support plate 141, and a hinge 142 connecting the first support plate 141 and the second support plate 141.

[0036] like Figure 1B As shown, the first screen lower position k1 is located on the hinge 142 and opposite to the bendable area 1121 of the back panel 112. This means the first light sensor 120 is integrated into the hinge 142. Specifically, the first light sensor 120 can be integrated into the hollowed-out position of the hinge 142. For example... Figure 1A and Figure 1B As shown, in some embodiments, there is one first photosensitive element 120 and one second photosensitive element 130.

[0037] Figure 4A A schematic diagram showing the arrangement of the first and second light-sensing elements of the foldable display screen according to other embodiments of the present invention is shown; Figure 4B It shows Figure 4A Side view of the placement of the first and second light sensors in the foldable display screen. Figure 5A A schematic diagram showing the arrangement of the first and second light-sensing elements of a foldable display screen according to some embodiments of the present invention is shown. Figure 5B It shows Figure 5A Side view of the placement of the first and second light sensors in the foldable display screen.

[0038] like Figure 4A , Figure 5A As shown, in some embodiments, the number of second photosensitive elements 130 is one, and the number of first photosensitive elements 120 is M, where M is an integer greater than or equal to 3. The M first photosensitive elements 120 are arranged at intervals along a first direction. In some embodiments, the M first photosensitive elements 120 are arranged at intervals along the first direction at a first under-screen position k1 opposite to the bending area 110b, and the M first photosensitive elements 120 are opposite to the M crease positions distributed in the bending area 110b in the first direction. The distances between the M crease positions and the bending axis L of the bending area 110b are different. Each of the M first photosensitive elements 120 is used to obtain the light intensity at a corresponding crease position in the bending area 110b. Thus, the M first photosensitive elements 120 are used to obtain the light intensity at the M crease positions distributed in the bending area 110b in the first direction.

[0039] like Figure 4B , Figure 5B As shown, in some embodiments, each of the first photosensitive element 120 and each of the second photosensitive elements 130 are at the same distance from the side surface of the back plate 112 away from the flexible display panel 111.

[0040] like Figure 4B , Figure 5B As shown, in some embodiments, M first photosensitive elements 120 can be arranged on a straight line at position k1 below the first screen, and this straight line is parallel to the bending axis L of the bending area 110b and the plane where the flat area 110a is located.

[0041] like Figure 4A and Figure 4B As shown, in some embodiments, the number of first photosensitive elements 120 is three or more, and each first photosensitive element 120 is arranged at intervals along a first direction at a position k1 below the first screen. It can be understood that three or more mounting points are arranged at intervals at the position k1 below the first screen. One first photosensitive element 120 may be mounted at a mounting point opposite to the bending axis L, and the remaining first photosensitive elements 120 may be mounted at at least two mounting points opposite to the same side of the bending axis L, so that the orthographic projection of one first photosensitive element 120 on the flexible display module 110 is located on the bending axis L, and the orthographic projections of the remaining first photosensitive elements 120 on the flexible display module 110 are located on the same side of the bending axis L. For example, the number of first photosensitive elements 120 is three, one first photosensitive element 120 is projected onto the bending axis L, and the other two first photosensitive elements 120 are projected onto the same side of the bending axis L.

[0042] like Figure 5A and Figure 5BAs shown, in some embodiments, the number of first photosensitive elements 120 is five or more, and each first photosensitive element 120 is arranged at intervals along a first direction at a position k1 below the first screen. It can be understood that there are five or more mounting points arranged at intervals at the position k1 below the first screen. One of the first photosensitive elements 120 is located at a mounting point opposite to the bending axis L, and the remaining first photosensitive elements 120 are located at at least four mounting points opposite both sides of the bending axis L, so that the orthographic projection of one first photosensitive element 120 onto the flexible display module 110 is located on the bending axis L, and the orthographic projections of the remaining first photosensitive elements 120 onto the flexible display module 110 are located on both sides of the bending axis L. For example, there are 5 first light-sensing elements 120. The orthographic projection of one first light-sensing element 120 onto the flexible display module 110 is located on the bending axis L. Among the other four first light-sensing elements 120, two of them are located on one side of the bending axis L, and the other two are located on the other side of the bending axis L.

[0043] Figure 6 A schematic diagram showing the arrangement of the first, second, and third light-sensing elements of a foldable display screen according to some embodiments of the present invention is shown. Figure 7 This diagram illustrates the arrangement of the first, second, and third light-sensing elements of a foldable display screen according to other embodiments of the present invention. Figure 8 A schematic diagram showing the arrangement of the first, second, and third light-sensing elements of a foldable display screen according to some embodiments of the present invention is provided. Figure 6 , Figure 7 , Figure 8 As shown, in some embodiments, each bendable display group 110-1 is further provided with at least one third light-sensing element 150. Each third light-sensing element 150 is disposed in the bending area 110b, and the first light-sensing element 120 and the third light-sensing element 150 are arranged at intervals along a second direction. The first light-sensing element 120 is disposed at the middle position of the bending area 110b along the second direction, and the second direction is perpendicular to the first direction.

[0044] In some embodiments, the middle position of the bending area 110b along the second direction is a position equidistant from the two end edges b1 and b2 of the bending area 110b, and the two end edges b1 and b2 are the edges of the bending area 110b that do not intersect with the flat area 110a.

[0045] In some embodiments, the third photosensitive element 150 is a photosensitive element, such as a photodiode. The third photosensitive element 150 can be integrated into the bending area 110b of each bendable display group 110-1 of the flexible display module 110, specifically into the panel area of ​​the flexible display panel 111 located in the bending area 110b.

[0046] In some embodiments, the third light sensing element 150 is an ambient light sensor integrating a photosensitive element, signal processing circuit, and auxiliary circuit. In this case, the third light sensing element 150 is positioned at a fourth under-screen position k4 opposite to the bending area 110b. It should be noted that in embodiments where the third light sensing element 150 is provided, the first under-screen position k1 needs to be equidistant from the two side edges b1 and b2 of the bending area 110b. The bending area 110b is the region enclosed by the two side edges b1 and b2 and the two boundary edges b3 and b4 that intersect the two flat areas 110a. The fourth under-screen position k4 is closer to one side edge b1 of the bending area 110b and farther from the other side edge b2 than the first under-screen position k1. That is, the third light sensing element 150 is closer to one side edge b1 of the bending area 110b than the first light sensing element 120, and farther from the other side edge b2 of the bending area 110b than the first light sensing element 120. The light intensity detected by the third photosensitive element 150 and the light intensity detected by the first photosensitive element 120 are used to jointly determine the crease detection result of the bending area 110b in the second direction. The crease detection result of the bending area 110b in the second direction may include at least one of the crease slope and crease depth at at least one crease location of the bending area 110b in the second direction, and may also include the crease morphology of the bending area 110b in the second direction, wherein the crease location is the position on the bending area 110b opposite to the third photosensitive element 150.

[0047] like Figure 6 As shown, in some embodiments, there is one third photosensitive element 150. The light intensity detected by this third photosensitive element 150 and the light intensity detected by the first photosensitive element 120 are used to jointly determine the crease position of the bending area 110b in the second direction, the crease slope and / or crease depth. The first photosensitive element 120 is disposed at a position below the screen opposite to a crease position that is equidistant from the two end edges b1, b2 of the bending area 110b.

[0048] like Figure 7 , Figure 8 As shown, in some other embodiments, the number of third photosensitive elements 150 is N, and the N third photosensitive elements 150 are arranged at intervals along the second direction in the bending region 110b, where N is an integer greater than 2.

[0049] In some embodiments, N third photosensitive elements 150 are arranged at intervals along the second direction at a fourth screen position k4 opposite to the bending region 110b. The N third photosensitive elements 150 are opposite to the N crease positions distributed in the bending region 110b in the second direction. The distances between the N crease positions distributed in the second direction and the same side edge b1 of the bending region 110b are different. The light intensity detected by the N third photosensitive elements 150 and the light intensity detected by the first photosensitive element 120 are used to jointly determine the crease morphology of the bending region 110b in the second direction.

[0050] In some embodiments, the N third photosensitive elements 150 disposed at the fourth screen lower position k4 can be distributed along a straight line parallel to the bending axis L. It is understood that the fourth screen lower position k4 is located on the support structure 140 and opposite to the bendable area 1121 of the back plate 112. The fourth screen lower position k4 is spaced apart from the first screen lower position k1. In some embodiments, the fourth screen lower position k4 is located on the hinge 142 and opposite to the bendable area 1121 of the back plate 112, thus integrating the third photosensitive elements 150 into the hinge 142. Specifically, the third light sensor 150 can be integrated into the hollowed-out position of the hinge 142, so that light can be transmitted through the hollowed-out opening of the back plate 112. This allows the third light sensor 150 located at the fourth screen position k4 below the bending area 110b to detect ambient light. Thus, the hollowed-out opening of the bendable area 1121 of the back plate 112 is reused, and there is no need to open a separate light-transmitting hole for the third light sensor 150 on the back plate 112.

[0051] like Figure 7 As shown, in some embodiments, the number of third light-sensing elements 150 is two or more, and each third light-sensing element 150 is arranged at intervals along the second direction, and can be arranged at intervals at the fourth under-screen position k4, which is located on one side of the first under-screen position k1. For example, the number of third light-sensing elements 150 is two, and they are disposed on the same side of the first light-sensing element 120.

[0052] like Figure 8 As shown, in some embodiments, the number of third light-sensing elements 150 is four or more, and each third light-sensing element 120 is arranged at intervals along the second direction, which can be arranged at intervals at the fourth under-screen position k4. A part of the fourth under-screen position k4 is located on one side of the first under-screen position k1, and another part is located on the other side of the first under-screen position k1. For example, the number of third light-sensing elements 150 is four, of which two third light-sensing elements 150 are disposed on one side of the first light-sensing element 120, and the remaining two third light-sensing elements 150 are disposed on the other side of the first light-sensing element 120.

[0053] Figure 9A schematic diagram showing the arrangement of the first and second photosensitive elements of a foldable display screen according to some embodiments of the present invention is illustrated. For example... Figure 9 As shown, in some other embodiments, both the first photosensitive element 120 and the second photosensitive element 130 are disposed in the bending region 110b, and the polarization direction of the ambient light collected by the first photosensitive element 120 is different from the polarization direction of the ambient light collected by the second photosensitive element 130.

[0054] In some embodiments, the first photosensitive element 120 and the second photosensitive element 130 disposed in the bending region 110b are both photosensitive elements, such as photodiodes. The first photosensitive element 120 and the second photosensitive element 130 can be integrated into the bending region 110b in the stacked structure of the flexible display module 110.

[0055] In other embodiments, the first photosensitive element 120 and the second photosensitive element 130 disposed in the bending area 110b are both ambient light sensors integrating a photosensitive element, a signal processing circuit, and an auxiliary circuit. The first photosensitive element 120 is disposed at a first under-screen position k1 opposite to the bending area 110b of the bendable display group 110-1, and the second photosensitive element 130 is disposed at a third under-screen position k3 opposite to the bending area 110b of the bendable display group 110-1.

[0056] In some embodiments, the first under-screen position k1 and the third under-screen position k3 are arranged adjacent to each other along the second direction, so that the first photosensitive element 120 and the second photosensitive element 130 are disposed below the bending area 110b, and the first photosensitive element 120 and the second photosensitive element 130 are arranged along the second direction and adjacent to each other, or the first photosensitive element 120 and the second photosensitive element 130 are arranged along the second direction and the distance between them is 0 to 5 mm. The first photosensitive element 120 and the second photosensitive element 130 being adjacent to each other means that the edge distance between the two sensors is ≤2 mm or they are directly attached. By arranging the second photosensitive element 130, whose polarization direction differs by 90°, and the first photosensitive element 120 along the second direction and being adjacent to each other, the second photosensitive element 130 and the first photosensitive element 120 detect ambient light incident from the same or similar positions.

[0057] In some embodiments, a first polarizing film is disposed on one side of the photosensitive surface of the first photosensitive element 120; a second polarizing film is disposed on one side of the photosensitive surface of the second photosensitive element 130, wherein the polarization directions of the first polarizing film and the second polarizing film are different. The polarization directions of the first polarizing film and the second polarizing film may differ by 90°.

[0058] In some embodiments, a first polarizing film is integrated in a first photosensitive element 120, and a second polarizing film is integrated in a second photosensitive element 130. In other embodiments, the first polarizing film is disposed in a light-transmitting channel corresponding to the first photosensitive element 120, and the second polarizing film is disposed in a light-transmitting channel corresponding to the second photosensitive element 130. Both of these embodiments enable the first photosensitive element 120 and the second photosensitive element 130 to detect linearly polarized light with different vibration directions.

[0059] In some embodiments, the second light-sensing element 130 and the first light-sensing element 120 are integrated in the hinge 142 and are opposite to the bendable area 1121 of the back plate 112, so that light can be transmitted through the hollow opening of the back plate 112, and the second light-sensing element 130 and the first light-sensing element 120 disposed below the bending area 110b can detect ambient light.

[0060] Figure 10 A schematic diagram showing the arrangement of the first and second light-sensing elements of a foldable display screen according to some embodiments of the present invention is illustrated. For example... Figure 9 , Figure 10 As shown, it can be understood that the number of second light sensing elements 130 is the same as that of first light sensing elements 120. One second light sensing element 130 and one first light sensing element 120 constitute a pair of light sensing elements 120 and 130 arranged adjacent to each other. The pair of light sensing elements 120 and 130 can detect ambient light incident from the same or similar position on the front of the bending area 110b of the flexible display module 110.

[0061] like Figure 9 As shown, in some embodiments, there is one second photosensitive element 130 and one first photosensitive element 120. One second photosensitive element 130 and one first photosensitive element 120 constitute a pair of photosensitive elements 120 and 130.

[0062] like Figure 10 As shown, in some embodiments, the number of second photosensitive elements 130 disposed at the third screen lower position k3 opposite to the bending area 110b is M, where M is an integer greater than 3. The M second photosensitive elements 130 and the M first photosensitive elements 120 are arranged in pairs, forming M pairs of photosensitive elements 120, 130. In each pair of photosensitive elements 120, 130, the first photosensitive element 120 and the second photosensitive element 130 are arranged adjacent to each other. The M pairs of photosensitive elements 120, 130 are arranged at intervals and are positioned opposite to the M crease positions distributed in the first direction of the bending area 110b.

[0063] like Figure 9 , Figure 10As shown, in some embodiments, the third screen under position k3 and the first screen under position k1 are adjacent to each other along the first direction. The long side direction of the bending area 110b is the extension direction of the boundary edges b3 and b4 where the bending area 110b and the flat area 110a meet, and the short side direction of the bending area 110b is the extension direction of the two end edges b1 and b2 of the bending area 110b. In some embodiments, in each pair of photosensitive elements 120 and 130, the polarization direction of the first polarizing film corresponding to the first photosensitive element 120 is 0° (along the first direction, i.e., the X-axis direction), and the polarization direction of the second polarizing film corresponding to the second photosensitive element 130 is 90° (along the second direction, i.e., the Y-axis direction).

[0064] Based on the same inventive concept, embodiments of the present invention provide an electronic device. Figure 11 A schematic diagram of the structure of an electronic device according to some embodiments of the present invention is shown. For example... Figure 11 As shown, the electronic device 10 provided in this embodiment of the invention includes a processing device 200 and a foldable display screen 100 as described in any of the above embodiments.

[0065] In this embodiment of the invention, the electronic device can be a foldable screen phone, foldable screen tablet, laptop computer, or foldable screen handheld device, etc. Both the first photosensitive element 120 and the second photosensitive element 130 are connected to the processing device 200. The processing device 200 is used to jointly determine the crease detection result of the bending area 110b in a first direction based on the light intensity detected by the first photosensitive element 120 and the light intensity detected by the second photosensitive element 130. The first direction is a direction perpendicular to the bending axis L of the bending area 110b. In this embodiment of the invention, the processing device 200 can be a system-on-a-chip (SOC) of the electronic device.

[0066] In some embodiments, each first photosensitive element 120 corresponds to a crease position in the bending region 110b. The processing device 200 then determines the crease slope in a first direction based on the light intensity detected by the first photosensitive element 120 positioned opposite the crease position, the light intensity detected by the second photosensitive element 130, and a pre-calibrated relationship. The pre-calibrated relationship is either the relationship between the light intensity transmitted through the flat region 110a and the light intensity transmitted through the bending region 110b with the crease slope, or the relationship between the light intensity transmitted through the bending region 110b in two polarization directions with the crease slope.

[0067] Figure 12 The diagram illustrates the difference in light intensity received by the flat and curved areas of a flexible display module under the same light source. For example... Figure 12As shown, when the same ambient light source L1 (light intensity I1) passes through both the flat area 110a and the bent area 110b simultaneously, the light intensity received by the first photosensitive element 120 in the bent area 110b is different from the light intensity received by the second photosensitive element 130 in the flat area 110a. The first photosensitive element 120 receives light L2 (light intensity I2), while the second photosensitive element 130 receives light L3 (light intensity I3). The light intensities of light L3 (light intensity I3) and light L2 (light intensity I2) are obviously different. Since the ambient light source L1 is incident in the bent area 110b, some of the light (light L4) is reflected by the inclined surface of the bent area 110b, resulting in the light intensity I3 of light L3 received by the second photosensitive element 130 being slightly weaker than the light intensity I2 of light L2. Therefore, the light intensity I2 of light L2 received by the first photosensitive element 120, the light intensity I3 of light L3 received by the second photosensitive element 130, and the transmittance K of the foldable display screen satisfy the following relationships: I2 = K × I1; I1 = I2 / K. According to the Fresnel formula and the refractive index of the foldable display screen 110, the relationship between I1 and I3 and the crease slope θ1 can be obtained: I1 = f(θ1, I3). Finally, eliminating I1, we can obtain the relationship between the light intensity transmitted through the flat area 110b and the light intensity transmitted through the bent area 110a and the crease slope, which is the relationship between I2 and I3 and the crease slope θ1: I2 = k f(θ1, I3) stores the pre-calibrated change relationship in the processing device 200.

[0068] Figure 13 This diagram illustrates the crease slope and crease depth in a first direction, as well as the position parameters of the first photosensitive element, in an embodiment of the present invention. In some embodiments, the processing device 200 is configured to: calculate the light intensity I2 detected by the first photosensitive element 120 and the light intensity I3 detected by the second photosensitive element 130 by substituting them into a pre-calibrated relationship as follows: Therefore, θ1 can be solved inversely, which gives the slope of the crease in the first direction at the crease location, i.e., as shown below. Figure 13 The angle θ1 is shown.

[0069] In some embodiments, the processing device 200 is configured to: determine the crease depth in the first direction at the crease location based on the crease slope in the first direction and the position parameters of the first photosensitive element 120 disposed opposite to the crease location, wherein the crease depth is... Figure 13 In the example y1 shown, the position parameter of the first photosensitive element 120 is the distance between the setting position of the first photosensitive element 120 and the bending axis L of the bending area 110b, which is... Figure 13 x1 as shown.

[0070] Understandably, the distance x1 between the first photosensitive element 120 and the bending axis L of the bending area 110b is fixed. The processing device 200 is used to: determine the crease depth y1 in the first direction at the crease location based on the calculated crease slope θ in the first direction and the distance x1 between the first photosensitive element 120 and the bending axis L of the bending area 110b, specifically referring to the following formula: tanθ1=x1 / y1, y1=x1 / arctanθ1; The crease depth at the determined crease location in the first direction can be used as a reference value for optical or mechanical compensation of the crease at that location, so as to reduce or even eliminate the crease.

[0071] In some embodiments, the processing device 200 is further configured to: use the crease depth in the first direction as a reference value to perform optical compensation on the crease position, and reduce the crease through subsequent light compensation, so that the crease performance can be disregarded when designing the flexible display module 110.

[0072] In some embodiments, the number of first photosensitive elements 120 is M, where M is an integer greater than or equal to 3, and the processing device 200 is further configured to: determine the crease morphology of the bending region 110b in the first direction based on the crease slope of the M crease positions relative to the M first photosensitive elements 120 in the first direction.

[0073] To determine the crease morphology of the bending area 110b in the first direction, in some embodiments, the processing device 200 is configured to: calibrate the crease morphology of the bending area 110b in the first direction based on the crease test results obtained during the development phase of the flexible display module 110 and the crease slopes of the M crease positions obtained in this study, thereby achieving real-time detection of the crease morphology of the bending area 110b. It is understood that the crease test results are a function of the crease slope with respect to the crease position. Therefore, based on the crease slopes of the M crease positions obtained in this study and the crease test results obtained during the development phase, the crease slopes of more crease positions distributed in the first direction can be determined, and the crease morphology of the bending area 110b in the first direction can be fitted based on the crease slopes of each crease position distributed in the first direction.

[0074] To determine the crease morphology of the bending area 110b in the first direction, in some embodiments, the processing device 200 is configured to: simulate the crease morphology of the bending area 110b in the first direction using an algorithm based on the crease slopes of the M crease positions obtained this time in the first direction. For example, based on the crease slopes of the M crease positions and the position parameters of the M crease positions obtained this time in the first direction, more crease slopes distributed in the first direction can be determined by linear interpolation, and the crease morphology of the bending area 110b in the first direction can be fitted based on the crease slopes of each crease position distributed in the first direction. The position parameters of the M crease positions are the distances between the placement positions of the M first photosensitive elements 120 and the bending axis L of the bending area 110b.

[0075] In other embodiments, the number of first photosensitive elements 120 is M, where M is an integer greater than or equal to 3, and the processing device 200 is further configured to: determine the crease morphology of the bending region 110b in the first direction based on the crease depth of the M crease positions opposite to the M first photosensitive elements 120 in the first direction.

[0076] To determine the crease morphology of the bending region 110b in the first direction, in some embodiments, the processing device 200 is configured to: utilize the crease depths of the M crease positions obtained above in the first direction, and the crease test results obtained from crease testing of the flexible display module 110 during the development phase, determine the crease depths of more crease positions distributed in the first direction of the bending region 110b, and fit the crease depths of each crease position distributed in the first direction of the bending region 110b to fit the crease morphology of the bending region 110b in the first direction, wherein the crease test results are a function of the crease depth with respect to the crease position.

[0077] To determine the crease morphology of the bending region 110b in the first direction, in some embodiments, the processing device 200 is configured to: simulate the crease morphology of the bending region 110b in the first direction using an algorithm based on the crease depths of the M crease positions distributed in the first direction obtained this time. For example, based on the crease depths of the M crease positions and their position parameters obtained this time, the crease depths of more crease positions distributed in the first direction of the bending region 110b can be determined by linear interpolation, and the crease morphology of the bending region 110b in the first direction can be fitted based on the crease slopes of each crease position distributed in the first direction of the bending region 110b.

[0078] Figure 14The crease morphology of the foldable display screen in the first direction is shown in an embodiment of the present invention. The crease morphology of the bending region 110b in the first direction can be fitted using any of the above embodiments. The fitted crease morphology of the bending region 110b in the first direction can be as follows: Figure 14 As shown, the crease morphology of the bending region 110b in the first direction can be characterized by the variation of crease slope and / or crease depth with crease position. Figure 14 In the diagram, the horizontal axis represents the position coordinates in the first direction, with the bending axis L as the 0 point, and the vertical axis represents the crease depth and the crease slope.

[0079] Through the embodiments of the present invention, a crease detection function is added to electronic devices, thereby improving the utilization rate of photosensitive elements in electronic devices. The detected crease morphology can be used to calibrate the crease quality judgment criteria of electronic devices, the material, stacking structure, and bending resistance of flexible display modules 110, and can also be used to calibrate the bending fatigue evolution law and lifespan.

[0080] like Figure 2 As shown, the bending area 110b will produce creases not only in the first direction, but also in the second direction. The second direction is... Figure 2 The Y-direction, that is, along the long side of the bending area 110b, in other words, the second direction is parallel to the bending axis L of the bending area 110b. Therefore, in some embodiments of the present invention, each bendable display group 110-1 is further provided with at least one third photosensitive element 150. The third photosensitive element 150 is disposed in the bending area 110b, and the first photosensitive element 120 and the third photosensitive element 150 are arranged at intervals along the second direction. The first photosensitive element 120 is disposed at the middle position of the bending area 110b along the second direction, and the second direction is perpendicular to the first direction. The processing device 200 is connected to the third photosensitive element 150. The processing device 200 is further configured to: determine the crease detection result of the bending area 110b in the second direction based on the light intensity detected by the third photosensitive element 150 and the light intensity detected by the first photosensitive element 120.

[0081] In some embodiments, each third photosensitive element 150 corresponds to a crease position in the bending area 110b. The processing device 200 is used to: determine the crease slope in the second direction of the crease position based on the light intensity detected by the third photosensitive element 150 positioned opposite the crease position, the light intensity detected by the first photosensitive element 120, and a pre-calibrated variation relationship. The pre-calibrated variation relationship is the relationship between the light intensity transmitted through the flat area 110b and the light intensity transmitted through the bending area 110a as a function of the crease slope. The pre-calibrated variation relationship can be referred to above, and will not be repeated here for the sake of brevity.

[0082] In some embodiments, the light intensity I2 detected by the first photosensitive element 120 and the light intensity I4 detected by the third photosensitive element 150 are substituted into a pre-calibrated variation relationship: I4=k By calculating f(θ2, I2), we can solve for θ2, which gives us the slope of the crease in the second direction at the crease location.

[0083] In some embodiments, the processing device 200 is further configured to: determine the crease depth of the crease location in the second direction based on the crease slope of the crease location in the second direction and the position parameter of the third photosensitive element 150, wherein the position parameter is the distance between the location of the third photosensitive element 150 and the first photosensitive element 120, that is, the distance between the location of the third photosensitive element 150 and the midpoint between the two end edges b1 and b2 of the bending area 110b.

[0084] Understandably, the distance x2 between the first photosensitive element 120 and the third photosensitive element 150 is fixed. The processing device 200 is used to: for each crease location distributed in the second direction of the bending area 110b, based on the calculated crease slope θ2 of that crease location in the second direction and the distance x2 between the first photosensitive element 120 and the third photosensitive element 150, determine the crease depth y2 in the second direction at that crease location, as shown in the following formula: tanθ2=x2 / y2, y2=x2 / arctanθ2; The crease depth at the crease location in the second direction can be used as a reference value for optical or mechanical compensation of the crease at that location, in order to reduce or even eliminate the crease.

[0085] In some embodiments, the number of third photosensitive elements 150 is N, and the N third photosensitive elements 150 are arranged at intervals along the second direction, where N is an integer greater than 2. The processing device 200 is then used to: determine the crease morphology of the bending region 110b in the second direction based on the crease slope of the N crease positions opposite to the N third photosensitive elements 150 in the second direction, or determine the crease morphology of the bending region 110b in the second direction based on the crease depth of the N crease positions opposite to the N third photosensitive elements 150 in the second direction.

[0086] To determine the crease morphology of the bending area 110b in the second direction, in some embodiments, the processing device 200 is configured to: calibrate the crease morphology of the bending area 110b in the second direction based on the crease test results obtained from the crease test of the flexible display module 110 during the development phase, and the crease slope or crease depth of the N crease positions distributed in the second direction of the bending area 110b obtained this time, thereby realizing real-time detection of the crease morphology of the bending area 110b in the second direction. It is understandable that the crease test results of the bending area 110b in the second direction are functions of the crease slope or crease depth with respect to the crease position. Therefore, based on one of the crease slope and crease depth of the N crease positions distributed in the second direction of the bending area 110b obtained this time, as well as the crease test results obtained during the development phase, the crease slope or crease depth of more crease positions distributed in the second direction of the bending area 110b can be determined, and the crease morphology of the bending area 110b can be fitted based on the crease slope or crease depth of each crease position distributed in the second direction of the bending area 110b.

[0087] To determine the crease morphology of the bending area 110b in the second direction, in some embodiments, the processing device 200 is configured to: simulate the crease morphology of the bending area 110b in the second direction using an algorithm based on the crease slope or crease depth of the N crease positions distributed in the second direction of the bending area 110b obtained this time. For example, based on one of the crease slope or crease depth of the N crease positions distributed in the second direction of the bending area 110b obtained this time, and the position parameters of the N crease positions, the crease slope or crease depth of more crease positions distributed in the second direction of the bending area 110b can be determined by linear interpolation, and the crease morphology of the bending area 110b in the second direction can be fitted based on the crease slope or crease depth of each crease position distributed in the second direction of the bending area 110b, wherein the position parameters of the N crease positions are the distances between the N third photosensitive elements 150 and the first photosensitive element 120.

[0088] In some embodiments, both the first photosensitive element 120 and the second photosensitive element 130 are disposed in the bending region 110b, and the polarization direction of the ambient light collected by the first photosensitive element 120 is different from that of the ambient light collected by the second photosensitive element 130, for example, by 90°, and the first photosensitive element 120 and the second photosensitive element 130 are disposed adjacent to each other. Because the light intensity of different polarization directions at the same location is different, the difference in light intensity detected by the first photosensitive element 120 and the second photosensitive element 130 with different polarization directions disposed at the same location in the bending region 110b can be used to pre-calibrate the relationship between the light intensity of the two polarization directions and the change of the crease slope. Based on the light intensity detected by the first photosensitive element 120, the light intensity detected by the second photosensitive element 130, and the pre-calibrated relationship, the crease slope in the first direction at the crease location is determined.

[0089] In some embodiments, the polarization direction of the ambient light collected by the first photosensitive element 120 differs from that of the ambient light collected by the second photosensitive element 130 by 90°. The pre-calibrated relationship can be found in the following formula, and the slope of the crease at the crease position in the first direction can be calculated based on the following formula:

[0090] in, , The light intensity detected by the first photosensitive element 120 The intensity of light detected by the second photosensitive element 130 is given. The polarization direction of the first photosensitive element 120 is 0° (along the first direction), and the polarization direction of the second photosensitive element 130 is 90° (along the second direction). n is the pre-calibrated refractive index of the foldable display screen. Let be the crease slope in the first direction at the crease location.

[0091] In some embodiments, after obtaining the crease slope of the crease location in the first direction, the processing device 200 is configured to: determine the crease depth of the crease location in the first direction based on the crease slope of the crease location in the first direction and the position parameters of the third photosensitive element 150 disposed opposite to the crease location.

[0092] Figure 15 The three-dimensional crease morphology of the foldable display screen in an embodiment of the present invention is shown. For example... Figure 15 As shown, based on the crease morphology of the bending region 110b in the first direction and the crease morphology of the bending region 110b in the second direction, the three-dimensional crease morphology of the bending region 110b can be further simulated.

[0093] According to one or more embodiments of the present invention, multiple photosensitive elements are combined to achieve self-inspection and precise quantification of the crease depth, crease slope, and crease morphology of the foldable display screen. Furthermore, the self-inspected crease depth, crease slope, and crease morphology can be used for more operations, such as optical compensation or mechanical compensation to achieve crease elimination. This allows the stacking design of flexible display modules to not focus on crease performance, and crease reduction can be achieved through post-compensation. The embodiments of the present invention also improve the utilization rate of photosensitive elements.

[0094] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A foldable display screen, characterized in that, include: A flexible display module includes at least one bendable display group, each of the bendable display groups includes two flat areas spaced apart along a first direction and a bendable area connecting the two flat areas, and each bendable display group is provided with at least one first photosensitive element and at least one second photosensitive element; The first photosensitive element is disposed in the bending area, and the second photosensitive element is disposed in any of the flat areas, or; Both the first and second photosensitive elements are disposed in the bending area, and the polarization direction of the ambient light collected by the first photosensitive element is different from that of the ambient light collected by the second photosensitive element.

2. The foldable display screen as described in claim 1, characterized in that, The number of the first photosensitive elements is M, and the M first photosensitive elements are arranged at intervals along the first direction, where M is an integer greater than or equal to 3.

3. The foldable display screen as described in claim 1, characterized in that, Each of the aforementioned bendable display groups is also provided with at least one third light-sensing element; The third photosensitive element is disposed in the bending area, and the first photosensitive element and the third photosensitive element are arranged at intervals along the second direction. The first photosensitive element is disposed at the middle position of the bending area along the second direction, and the second direction is perpendicular to the first direction.

4. The foldable display screen as described in claim 3, characterized in that, The number of the third photosensitive elements is N, and the N third photosensitive elements are arranged at intervals along the second direction, where N is an integer greater than 2.

5. The foldable display screen as described in any one of claims 1-4, characterized in that, The second photosensitive element is disposed in the bending area; A first polarizing film is disposed on one side of the photosensitive surface of the first photosensitive element; A second polarizing film is provided on one side of the photosensitive surface of the second photosensitive element, and the polarization direction of the first polarizing film is 90° different from the polarization direction of the second polarizing film.

6. The foldable display screen as described in any one of claims 1-4, characterized in that, The flexible display module includes a flexible display panel and a back plate. The back plate is disposed on the back of the flexible display panel. The back plate includes a bendable area located in the bending area and a non-bendable area located in the flat area. The bendable area is provided with a hollow opening. The foldable display screen also includes a support structure disposed on the side of the back panel away from the flexible display panel. The first light-sensing element is integrated into the support structure, and the orthographic projection of the first light-sensing element on the back panel is located in the bendable area of ​​the back panel.

7. An electronic device, characterized in that, include: Foldable display screen as described in any one of claims 1-6; The processing device, connected to the first photosensitive element and the second photosensitive element, is used to determine the crease detection result of the bending area in a first direction based on the light intensity detected by the first photosensitive element and the light intensity detected by the second photosensitive element, wherein the first direction is a direction perpendicular to the bending axis of the bending area.

8. The electronic device as claimed in claim 7, characterized in that, Each of the first photosensitive elements corresponds to a crease position in the bending area; the processing device is used for: The crease slope in the first direction is determined based on the light intensity detected by the first photosensitive element positioned opposite to the crease position, the light intensity detected by the second photosensitive element, and a pre-calibrated variation relationship. The aforementioned relationship refers to the relationship between the light intensity transmitted through the flat area and the light intensity transmitted through the curved area with the slope of the crease, or the relationship between the light intensity of the two polarization directions transmitted through the curved area with the slope of the crease.

9. The electronic device as claimed in claim 8, characterized in that, The processing device is used for: The crease depth at the crease location in the first direction is determined based on the crease slope at the crease location in the first direction and the position parameters of the first photosensitive element. The position parameter is the distance between the location of the first photosensitive element and the bending axis of the bending area.

10. The electronic device as claimed in claim 8, characterized in that, The number of the first photosensitive elements is M, and the M first photosensitive elements are arranged at intervals along the first direction, where M is an integer greater than or equal to 3. The processing device is further configured to: The crease morphology of the bending area in the first direction is determined based on the crease slope of the M crease positions opposite to the M first photosensitive elements in the first direction.

11. The electronic device as claimed in claim 7, characterized in that, Each of the bendable display groups is further provided with at least one third photosensitive element, the third photosensitive element being disposed in the bending area, the first photosensitive element and the third photosensitive element being arranged at intervals along a second direction, the first photosensitive element being disposed at the middle position of the bending area along the second direction, the second direction being perpendicular to the first direction; The processing device is connected to the third photosensitive element, and the processing device is further configured to: determine the crease detection result of the bending area in the second direction based on the light intensity detected by the third photosensitive element and the light intensity detected by the first photosensitive element.

12. The electronic device as claimed in claim 11, characterized in that, Each of the third photosensitive elements corresponds to a crease position in the bending area; The processing device is used for: Based on the light intensity detected by the third photosensitive element positioned opposite the crease position, the light intensity detected by the first photosensitive element, and a pre-calibrated relationship, the crease slope in the second direction at the crease position is determined. The relationship is the relationship between the light intensity transmitted through the flat area and the light intensity transmitted through the curved area with the crease slope.

13. The electronic device as claimed in claim 12, characterized in that, The processing device is used for: Based on the crease slope in the second direction and the position parameters of the third photosensitive element, the crease depth in the second direction is determined, wherein the position parameters are the distance between the setting position of the third photosensitive element and the first photosensitive element.

14. The electronic device as claimed in claim 11, characterized in that, The number of the third photosensitive elements is N, and the N third photosensitive elements are arranged at intervals along the second direction, where N is an integer greater than 2; the processing device is further used for: The crease morphology of the bending area in the second direction is determined based on the crease slope of the N crease positions opposite to the N third photosensitive elements in the second direction.

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