Flexible display panel, preparation method thereof and display device

Abstract

This disclosure provides a flexible display panel, its fabrication method, and a display device. The flexible display panel includes a flexible display substrate and a sound driving module. The flexible display substrate includes a display area, and the sound driving module is disposed on one side of the flexible display substrate and includes multiple sound driving units, with at least some of the sound driving units' orthogonal projections onto the flexible display substrate falling within the display area. Integrating the sound driving module with the flexible display substrate in this flexible display panel enables the display panel to emit sound while also improving its portability.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more specifically, to a flexible display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] In the rapid development of technology, flexible screen technology has emerged as a crucial trend in the display field. Flexible screens possess unique characteristics of being bendable and foldable, enabling users to enjoy a more flexible and personalized experience. Meanwhile, audio technology is constantly evolving. Traditional speakers, due to their physical form and sound-producing principles, are proving inadequate for the extremely limited internal space requirements of some electronic products. Therefore, achieving ideal sound performance on the special medium of flexible screens has become a highly important research focus. Summary of the Invention

[0003] This disclosure provides a flexible display panel, a method for manufacturing the same, and a display device. In this flexible display panel, a sound driving module is integrated with the flexible display substrate. While realizing the sound function of the flexible display screen, it also improves the problems caused by external sound devices, such as poor portability and the need to improve sound quality.

[0004] This disclosure provides a flexible display panel, which includes a flexible display substrate and a sound driving module. The flexible display substrate includes a display area. The sound driving module is disposed on one side of the flexible display substrate and includes a plurality of sound driving units, at least some of which have their orthogonal projections onto the flexible display substrate falling within the display area.

[0005] In the above solution, the integrated structure formed by integrating the sound driving module with the flexible display substrate not only improves the portability of the flexible display panel, but also optimizes the circuit layout related to the sound generation function, thereby reducing signal loss during signal transmission and improving the sound quality of the flexible display panel.

[0006] In one specific embodiment of the first aspect of this disclosure, the sound driving module includes a mover layer and a coil layer. The mover layer is disposed on one side of the flexible display substrate and includes multiple mover structures. The coil layer is disposed on the side of the mover layer opposite to the flexible display substrate and includes multiple coil structures, the coil ends of which are connected in a direction perpendicular to the flexible display substrate. Each mover structure and coil structure corresponds one-to-one, and each set of mover structures and coil structures constitutes a sound driving unit. The mover structure is configured to reciprocate within the coil structure in a direction perpendicular to the flexible display substrate.

[0007] In the above scheme, the mover structure in the mover layer is configured to reciprocate relative to the coil structure in the coil layer in a direction perpendicular to the flexible display substrate, thereby generating vibration perpendicular to the coil. This vibration is transmitted to the flexible display substrate, causing the air molecules on the surface of the flexible display substrate to undergo periodic compression and expansion, thereby forming sound waves and ultimately realizing the sound-emitting function of the flexible display panel.

[0008] Optionally, multiple moving element structures are arranged in an array. This improves the uniformity of vibration distribution on the surface of the flexible display substrate, thereby improving the uniformity of sound emission from the flexible display panel, enhancing the sound quality of the flexible display panel, and ultimately improving the user experience.

[0009] In one specific embodiment of the first aspect of this disclosure, the moving part structure includes a housing and a magnetic body. The housing includes a main body and a plurality of mass blocks, each mass block being elastically connected to the main body of the housing. At least one mass block encloses a receiving space, within which the coil structure is located. The magnetic body includes a frame and a magnetic block. The frame is a cavity with an opening, and the magnetic block is located within the cavity and extends from the bottom of the frame toward the opening of the frame. The magnetic body is located within the receiving space, and the opening of the frame is away from the flexible display substrate, so that the magnetic block extends into the coil structure, and the magnetic block reciprocates in a direction perpendicular to the flexible display substrate by inducing changes in the magnetic field around the coil structure.

[0010] In the above scheme, the magnetic block inserted into the coil structure moves back and forth in a direction perpendicular to the flexible display substrate by inducing the magnetic field change generated by the current in the coil structure, thereby generating vibration and realizing the sound function of the flexible display panel.

[0011] Optionally, the frame and the mass block are seamlessly connected. This improves the stability of the moving part structure's vibration, reduces errors, and thus enhances the sound performance of the flexible display panel.

[0012] In one specific embodiment of the first aspect of this disclosure, the mass block is elastically connected to the main body of the housing via a spring arm.

[0013] In the above scheme, the elastic arm can be used to decouple the mass block from the housing, thereby reducing the impact of the vibration of the magnetic block connected to the mass block on the stability of the housing and even the flexible display substrate, thus improving the stability of the flexible display panel.

[0014] Optionally, the cross-sectional shape of the spring arm is S-shaped in the direction parallel to the flexible display substrate.

[0015] Optionally, multiple spring arms are provided, with a mass block enclosing and forming a receiving space. The mass block is an integral structure, and the spring arms are evenly distributed on the mass block.

[0016] Optionally, the cross-sectional shape of the mass block of the integrated structure is annular in the direction parallel to the flexible display substrate.

[0017] In one specific embodiment of the first aspect of this disclosure, the coil layer further includes a control component located on the side of the coil structure away from the mover layer, and the control component includes a sound driving module.

[0018] The above solution not only facilitates wiring but also reduces the loss of the sound driver module and improves the sound output of the flexible display panel.

[0019] Optionally, the control component includes multiple flexible circuit boards, each corresponding to a coil structure. Optionally, the orthographic projection of the flexible circuit board on the flexible display substrate covers the orthographic projection of the coil structure and the mass block on the flexible display substrate.

[0020] Optionally, the control components also include a touch module. In this way, the flexible display panel achieves both sound generation and touch functionality, further improving the integration of the flexible display panel.

[0021] In one specific embodiment of the first aspect of this disclosure, the flexible display panel further includes an adhesive layer. The adhesive layer is disposed on the side of the moving element layer adjacent to the flexible display substrate.

[0022] In one specific embodiment of the first aspect of this disclosure, the flexible display panel further includes an electromagnetic shielding layer disposed between the flexible display substrate and the moving part layer.

[0023] In the above solution, the electromagnetic shielding layer is used to prevent the magnetic material in the sound drive module from adsorbing foreign objects onto the flexible display panel, thereby improving the reliability of the flexible display panel.

[0024] Optionally, the electromagnetic shielding layer can be any one of a copper foil layer, an aluminum foil layer, or a nickel-iron alloy layer.

[0025] Optionally, the flexible display panel further includes a support layer disposed between the electromagnetic shielding layer and the flexible display substrate.

[0026] Optionally, the flexible display panel also includes a polarizer disposed on the side of the flexible display substrate away from the electromagnetic shielding layer.

[0027] The second aspect of this disclosure provides a method for fabricating a flexible display panel, the method comprising providing a flexible display substrate, the flexible display substrate including a display area; forming a sound driving module on one side of the flexible display substrate, the sound driving module including a plurality of sound driving units, at least some of the sound driving units having their orthogonal projections on the flexible display substrate falling within the display area.

[0028] By integrating a sound driving module into the flexible display panel obtained by the fabrication method, the sound-emitting function of the flexible display panel is realized, while the sound-emitting effect and integration are improved, thereby enhancing the user experience.

[0029] In one specific embodiment of the second aspect of this disclosure, a sound driving module is formed on one side of a flexible display substrate, comprising: forming a mover layer, the mover layer including a plurality of mover structures; forming a coil layer, the coil layer including a plurality of coil structures, the openings of the coil structures communicating in a direction perpendicular to the flexible display substrate; assembling the mover layer and the coil layer together to form a sound driving module; and attaching the sound driving module to one side of the flexible display substrate, with the mover layer close to the flexible display substrate.

[0030] In one specific embodiment of the second aspect of this disclosure, a sound driving module is formed on one side of a flexible display substrate, comprising: forming a mover layer, the mover layer including a plurality of mover structures; attaching the mover layer to one side of the flexible display substrate; forming a coil layer, the coil layer including a plurality of coil structures, the openings of the coil structures communicating in a direction perpendicular to the flexible display substrate; and assembling the coil layer and the mover layer together to form the sound driving module.

[0031] The third aspect of this disclosure provides a display device, which includes the flexible display panel described in the first aspect or the flexible display panel obtained by the preparation method of the second aspect. Attached Figure Description

[0032] Figure 1 This is a plan view of the back of a flexible display panel provided in an embodiment of the present disclosure.

[0033] Figure 2 Provided for an embodiment of this disclosure Figure 1 A schematic cross-sectional view of a flexible display panel in the M1N1 direction.

[0034] Figure 3 Provided for an embodiment of this disclosure Figure 1 A schematic cross-sectional view of the moving layer in the M1N1 direction of a flexible display panel.

[0035] Figure 4 Provided for an embodiment of this disclosure Figure 1 A schematic diagram of a cross-section of a flexible display panel perpendicular to the M1N1 direction.

[0036] Figure 5 Provided for an embodiment of this disclosure Figure 1 A schematic cross-sectional view of the coil layer in the M1N1 direction of a flexible display panel.

[0037] Figure 6 Provided for an embodiment of this disclosure Figure 1 A schematic cross-sectional view of a flexible display panel in the M1N1 direction.

[0038] Figure 7 This is a cross-sectional schematic diagram of a flexible display panel provided in one embodiment of the present disclosure.

[0039] Figure 8 This is a cross-sectional schematic diagram of another flexible display panel provided in an embodiment of the present disclosure.

[0040] Figure 9 This is a cross-sectional schematic diagram of another flexible display panel provided in an embodiment of the present disclosure.

[0041] Figure 10 This is a cross-sectional schematic diagram of another flexible display panel provided in an embodiment of the present disclosure.

[0042] Figure 11 This is a cross-sectional schematic diagram of another flexible display panel provided in an embodiment of the present disclosure.

[0043] Figure 12 An exploded view of a flexible display panel provided in one embodiment of this disclosure.

[0044] Figure 13 This is a schematic flowchart illustrating a method for fabricating a flexible display panel according to an embodiment of the present disclosure.

[0045] Figure 14 This is a schematic flowchart illustrating another method for fabricating a flexible display panel according to an embodiment of the present disclosure.

[0046] Figure 15 This is a schematic diagram illustrating a method for fabricating a flexible display panel according to an embodiment of this disclosure.

[0047] Figure 16 This is a schematic flowchart illustrating another method for fabricating a flexible display panel according to an embodiment of the present disclosure.

[0048] Figure 17 This is a schematic diagram illustrating another method for fabricating a flexible display panel according to an embodiment of the present disclosure.

[0049] Figure label: 100 - Flexible display substrate; 110 - Display area; FPC - Control panel; 200-Sound drive module; 200a-Sound drive unit; 210-Motor layer; 210a-Motor structure; 211-Shell; 211a-Main body; 211b-Mass block; A-Accommodation space; 212-Magnetic body; 212a-Frame; B-Cavity with opening; 212b-Magnetic block; 213-Spring arm; 220 - Coil layer; 221 - Coil structure; 222 - Control components; 222a - Flexible circuit board; 300 - Adhesive layer; 400 - Electromagnetic shielding layer; 500 - Support layer; 600 - Polarizing film; 700 - Cover plate; 800 - Adhesive layer. Detailed Implementation

[0050] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0051] The moving iron driver technology has its unique advantages. Compared to some traditional sound-generating devices, it does not require a complex speaker structure, numerous sound-generating units, or cumbersome acoustic conduction components. It can effectively complete the sound generation task simply by relying on the moving iron driver located below the screen of the display device and working in harmony with the screen itself. Therefore, this technology is widely used in various display devices.

[0052] However, the moving iron actuator technology also has certain limitations in its application. For example, it usually adopts an external design, which occupies the space of the entire device, resulting in an increase in the thickness and weight of the whole machine, thus making the device inconvenient to carry.

[0053] Therefore, this disclosure provides a flexible display panel, a method for manufacturing the same, and a display device. The flexible display panel includes a flexible display substrate and a sound driving module. The flexible display substrate includes a display area. The sound driving module is disposed on one side of the flexible display substrate and includes multiple sound driving units, at least some of which have their orthographic projections onto the flexible display substrate falling within the display area. Thus, the sound driving module and the display module are stacked together to form an integrated sound-generating module, i.e., an integrated structure. This integrated structure makes the flexible display panel more concise and compact, avoiding space waste caused by external components. This is especially beneficial for applications with high space requirements, such as portable electronic devices (laptops, tablets, etc.), allowing the device to integrate more functions within a limited volume and making it easier to store and carry. Furthermore, compared to the connection lines between external structures and the display device, which may be subject to external interference during signal transmission, leading to signal attenuation or distortion, this integrated structure can employ a shorter and more optimized internal circuit layout, reducing signal loss during transmission and thus improving sound quality, resulting in superior sound performance for the flexible display panel. In addition, the integrated structure can reduce assembly steps, such as the installation and debugging of external components. By simplifying the assembly process, it can reduce the defect rate caused by too many assembly steps, thereby improving production efficiency.

[0054] The following description, in conjunction with the accompanying drawings, describes a flexible display panel, its fabrication method, and a display device according to at least one embodiment of the present disclosure.

[0055] For example, such as Figure 1 and Figure 2 As shown, the flexible display panel includes a flexible display substrate 100 and a sound driving module 200 disposed on the flexible display substrate 100. The flexible display substrate 100 includes a display area 110. The flexible display substrate 100 has good mechanical properties and can withstand repeated bending and folding operations without easily breaking or deforming. The materials of the flexible display substrate 100 include, but are not limited to, polyimide (PI) and polyethylene terephthalate (PET).

[0056] The sound driving module 200 is disposed on one side of the flexible display substrate 100, such as the backlight side of the flexible display substrate 100. It forms an integrated structure with the flexible display substrate 100. Its purpose is to utilize the characteristics of the sound driving module 200, such as a moving iron driver, to cooperate with the flexible display substrate to realize the sound-emitting function of the flexible display panel. The sound driving module 200 includes multiple sound driving units 200a, at least some of which have their orthographic projections onto the flexible display substrate 100 falling within the display area 110. Specifically, all sound driving units 200a are disposed within the display area 110 of the flexible display substrate 100, or some of the sound driving units 200a are disposed within the display area 110 of the flexible display substrate 100, while some of the sound driving units 200a are disposed within the non-display area of ​​the flexible display substrate 100. The specific design scheme can be designed according to actual needs and will not be elaborated here.

[0057] Multiple sound driving units 200a are arranged in an array, such as a matrix distribution. Specifically, the sound driving units 200a are regularly arranged in rows and columns on the flexible display substrate 100, similar to the matrix arrangement of pixels in the flexible display substrate 100. Each sound driving unit 200a has its specific position coordinates. Through the cross-positioning of rows and columns, the position of the user's touch can be accurately determined. Combined with the signals output by the control unit, such as the touch module, it can realize both sound generation and touch functions. For example, on a 1080p flexible display panel, the sound driving units 200a may be distributed according to each row of pixels in the horizontal direction and each column of pixels in the vertical direction, forming a dense matrix network. In this way, the compact and uniform distribution of the sound driving units 200a on the flexible display substrate 100 can improve the uniformity of sound generation of the flexible display panel, improve the sound quality of the flexible display panel, and enhance the user experience.

[0058] This disclosure does not limit the structure of the flexible display substrate 100. The flexible display substrate 100 may include basic functional structures such as a substrate, an array layer, a light-emitting layer, and an encapsulation layer. The array layer is used to house thin-film transistors and their wiring. The light-emitting layer may include an anode layer, a pixel definition layer, and a cathode layer to emit light for display purposes. The encapsulation layer covers the light-emitting layer to encapsulate the functional structures. Depending on the type of flexible display panel, OLED (Organic Light-Emitting Diode) or AMOLED (Active-matrix Organic Light-Emitting Diode) may be used. All of these can be designed according to actual needs and will not be elaborated upon here.

[0059] It should be noted that the structure of the flexible display panel in this embodiment is not limited to the examples above. For instance, multiple sound driving units 200a can be arranged in a partitioned manner on one side of the flexible display substrate 100. Specifically, this design can divide the flexible display panel into different areas according to its functional requirements and usage scenarios, and independently set sound driving units 200a in each area, thereby achieving personalized design based on different areas and improving user experience. Another example is that multiple sound driving units 200a can be arranged in a grid pattern on the flexible display substrate 100. Specifically, the multiple sound driving units 200a are arranged in a grid pattern, i.e., grid units, which surround two or more adjacent pixel units or sub-pixels. This design not only facilitates subsequent wiring and reduces the impact on display effect, but also has the advantages of strong signal stability and anti-interference. Yet another example is that multiple sound driving units 200a can be arranged in a surround pattern on the flexible display substrate 100. Specifically, multiple sound driving units 200a are arranged around the edge of the display area 110 on the flexible display substrate 100, thereby reducing the impact on display effect. All of the above can be designed according to actual needs, and will not be elaborated here.

[0060] Based on the above embodiments, this disclosure also describes the specific structure of the sound driving module 200.

[0061] For example, in a flexible display panel provided in one embodiment of this disclosure, such as Figure 2 As shown, the sound driving module 200 includes a mover layer 210 and a coil layer 220. The mover layer 210 is disposed on one side of the flexible display substrate 100, such as the backlight side of the flexible display substrate 100, and includes multiple mover structures 210a. The coil layer 220 is disposed on the side of the mover layer 210 away from the flexible display substrate 100, and includes multiple coil structures 221. The coils of the coil structures 221 are connected in a direction perpendicular to the flexible display substrate 100, that is, in a direction perpendicular to the thickness of the flexible display substrate 100. The mover structures 210a and the coil structures 221 correspond one-to-one. Each set of mover structures 210a and coil structures 221 constitutes a sound driving unit 200a. The mover structures 210a are configured to reciprocate within the coil structures 221 in a direction perpendicular to the flexible display substrate 100.

[0062] Specifically, the coil structure 221 is formed by multiple turns of coil, each turn forming a hollow opening. These hollow openings are interconnected and together constitute the opening of the coil structure 221. This opening is arranged perpendicular to the thickness direction of the flexible display substrate 100, meaning it is a transparent structure in the thickness direction of the flexible display substrate 100. This facilitates smooth magnetic field conduction and air circulation during vibration, preventing a reduction in sound generation efficiency due to the coil being closed in the middle, thereby improving both magnetic field conduction and vibration sound generation efficiency.

[0063] The basic working principle of the sound generation achieved by the cooperation between the coil structure 221 and the moving part structure 210a is as follows: When the coil structure 221 is energized, by changing the positive and negative poles of the current on the coil structure 221, the moving part structure 210a is made to reciprocate in the direction perpendicular to the flexible display substrate 100, that is, in the direction perpendicular to the thickness of the flexible display substrate 100, thereby generating vibration, so that the flexible display panel generates sound.

[0064] Specifically, when current flows through coil structure 221, a magnetic field is generated around coil structure 221. Changes in the magnitude and direction of the current cause corresponding changes in the strength and direction of the magnetic field. For example, when an audio signal is input to coil structure 221, the continuous change in the audio current causes the magnetic field generated by coil structure 221 to also be dynamically changing. The moving part structure 210a is typically made of ferromagnetic material, such as an iron core, and is located within the magnetic field generated by coil structure 221. Because ferromagnetic materials are easily magnetized, when the magnetic field generated by coil structure 221 changes, moving part structure 210a is subjected to a force from the magnetic field. This force causes moving part structure 210a to vibrate or move within the magnetic field. The vibration of moving part structure 210a is transmitted to flexible display substrate 100. This vibration causes the air molecules on the surface of flexible display substrate 100 to undergo periodic compression and expansion, thereby forming sound waves that propagate into the surrounding space and are ultimately received by the human ear, allowing people to hear sound. In this process, the vibration direction of the moving structure 210a is perpendicular to the thickness direction of the flexible display substrate 100. This design can more effectively transmit the vibration to the flexible display substrate 100, thereby improving the efficiency and quality of sound generation of the flexible display substrate 100.

[0065] In the flexible display panel provided in at least one embodiment of this disclosure, a plurality of moving substructures 210a are arranged in an array. The number of moving substructures 210a may vary depending on the size and design requirements of the flexible display panel. The specific distribution of the array arrangement of the moving substructures 210a can be referred to the above embodiments and will not be repeated here.

[0066] Based on the above embodiments, after introducing the working relationship between the moving part structure 210a and the coil structure 221 in the sound driving unit 200a, the present disclosure also designed the specific structure of the moving part structure 210a, as follows.

[0067] In a flexible display panel provided in one embodiment of this disclosure, such as Figure 3 As shown, the moving part structure 210a includes a housing 211 and a magnetic body 212. The housing 211 includes a main body 211a and a plurality of mass blocks 211b. Each mass block 211b is elastically connected to the main body 211a of the housing 211. At least one mass block 211b encloses a receiving space A, and the coil structure 221 is located within the receiving space A. The magnetic body 212 includes a frame 212a and a magnetic block 212b. The frame 212a is a cavity B with an opening. The magnetic block 212b is located within the cavity and extends from the bottom of the frame 212a toward the opening of the frame 212a. The magnetic body 212 is located within the receiving space A, and the opening of the frame 212a is close to the flexible display substrate 100, so that the magnetic block 212b extends into the coil structure 221. The magnetic block 212b reciprocates in a direction perpendicular to the flexible display substrate 100, inducing changes in the magnetic field of the coil structure 221.

[0068] For example, the mass block 211b is a non-magnetic body made of a high-density metal material, such as at least one of tungsten alloy, nickel-copper alloy, and stainless steel. The mass block 211b is used to increase the equivalent mass of the vibration system, increase the vibration momentum, and improve the loudness and low-frequency sound effect. Specifically, the mass block 211b not only increases the equivalent mass of the vibration system but also increases the vibration momentum under the same electromagnetic driving force, thereby improving the loudness and low-frequency sound effect.

[0069] For example, the frame 212a is a non-magnetic frame, generally made of plastic or non-magnetic metal such as aluminum alloy or non-magnetic stainless steel. The frame 212a not only covers and fixes the magnet 212b to form a magnetic body 212, improving the integrity of the mover structure 210a, but also prevents external magnetic fields from affecting the magnetic field strength and magnetic field distribution stability of the magnetic body 212, thereby improving the working stability and anti-interference ability of the sound drive module 200.

[0070] When current flows through coil structure 221, the magnetic field generated by coil structure 221 exerts an attractive or repulsive force on the magnetic block 212b in moving element structure 210a, causing the moving element, i.e., magnetic block 212b, in moving element structure 210a to vibrate within the accommodating space A. Because the audio signal is a constantly changing alternating current signal, the magnetic field of coil structure 221 also changes constantly. The magnetic block 212b will then reciprocate relative to coil structure 221 in a direction perpendicular to the flexible display substrate 100 according to the changing magnetic field, causing moving element structure 210a to vibrate accordingly. For example, when the audio signal current increases, the magnetic field of coil structure 221 strengthens, the magnetic force on magnetic block 212b in moving element structure 210a increases, and the vibration amplitude of magnetic block 212b also increases; conversely, when the audio signal current decreases, the vibration amplitude of magnetic block 212b in moving element structure 210a decreases.

[0071] In at least one embodiment of the flexible display panel provided in this disclosure, the frame 212a and the mass block 211b are seamlessly connected. The frame 212a and the mass block 211b can be injection molded into an integrated structure, resulting in a good seamless connection, high bonding strength, improved vibration stability of the mover structure 210a, reduced errors, and thus improved sound emission performance of the flexible display panel. Alternatively, the frame 212a and the mass block 211b can also be seamlessly connected by adhesive bonding, mechanical connections such as ferrule connections, threaded connections, or welding. In this way, the magnetic body 212 and the mass block 211b form an integral mover structure 210a, thereby improving the overall strength and vibration stability of the mover structure 210a.

[0072] All of the above can be designed according to actual needs, and will not be elaborated here.

[0073] In a flexible display panel provided in one embodiment of this disclosure, such as Figure 2 and Figure 3 As shown, the mass block 211b is elastically connected to the main body 211a of the housing 211 via a spring arm 213. In this way, the spring arm 213 decouples the mass block 211b from the housing 211. During vibration of the magnetic block 212b connected to the frame 212a seamlessly connected to the mass block 211b, the spring arm 213 not only prevents the housing 211 from being affected by vibration, but also acts as a buffer and damper against force and vibration. This helps improve the stability of the flexible display panel structure and also improves the stability of the vibration center of gravity, avoiding problems such as eccentricity, swaying, and abnormal vibration, thereby improving the reliability and service life of the sound-generating structure.

[0074] In the flexible display panel provided in at least one embodiment of this disclosure, such as Figure 4As shown, the cross-sectional shape of the spring arm 213 is S-shaped in the direction parallel to the flexible display substrate 100. The S-shaped spring arm 213 can not only effectively protect the housing 211 from the vibration of the magnetic block 212b in the magnetic body 212, but also save installation space to a certain extent. Through the reasonable bending layout of the S-shaped structure, the required elasticity and deformation capability can be achieved in a limited space.

[0075] In the flexible display panel provided in at least one embodiment of this disclosure, such as Figure 4 As shown, multiple spring arms 213 are provided, and a mass block 211b encloses and forms a receiving space A. The mass block 211b is an integral structure, and the spring arms 213 are evenly distributed on the mass block 211b. The multiple spring arms 213 work together to disperse the force and vibration energy they bear, thereby enhancing the overall buffering capacity and helping to reduce the adverse effects of the vibration of the magnetic block 212b in the magnetic body 212 on the shell 211.

[0076] For example, such as Figure 4 As shown, there are four spring arms 213. The four spring arms 213 are evenly distributed in a cross shape with the center of the mass block 211b as the center, and the included angle between adjacent spring arms 213 is 90 degrees.

[0077] In the flexible display panel provided in at least one embodiment of this disclosure, such as Figure 4 As shown, the cross-sectional shape of the integrated mass block 211b is annular in the direction parallel to the flexible display substrate 100. Thus, the annular integrated mass block 211b not only provides an effective working space, i.e., a accommodating space A, for the magnetic body 212, but also facilitates the uniform distribution of the spring arms 213, which effectively reduces the space occupied by the sound driving module 200 in the entire device.

[0078] It should be noted that the structure of the flexible display panel in this embodiment is not limited to the above examples. For example, multiple mass blocks 211b are divided into multiple groups, each group including at least two mass blocks 211b. Each mass block 211b is elastically connected to the main body 211a of the housing 211. The mass blocks 211b in a group surround the center to form a receiving space A, and the coil structure 221 is located within the receiving space A. For example, based on the design scheme of a group of mass blocks 211b surrounding the receiving space A, each group of mass blocks 211b is provided with multiple elastic arms 213, and each mass block 211b is connected to one elastic arm 213. For example, based on the above design scheme of each mass block 211b in a group being connected to one elastic arm 213, the elastic arms 213 are symmetrically distributed along the center of the receiving space A. For example, the number of mass blocks 211b in a group can be two, three, four, five, six, etc., and the number of corresponding elastic arms 213 can be two, three, four, five, six, etc.

[0079] For example, the mass blocks 211b within a group may be at least one of the following shapes: fan-shaped, block-shaped, or strip-shaped. Alternatively, the mass blocks 211b within a group may have the same shape. Or, different groups of mass blocks 211b may have different shapes. Thus, at least some groups of mass blocks 211b may have different shapes and be arranged at different positions in the display area 110 or non-display area of ​​the flexible display substrate 100. This not only allows for flexible avoidance of the effective display area and internal components, making full use of the device's bezel and gap space, which is beneficial for achieving narrow bezels, high screen-to-body ratio, and overall thinness, but also optimizes the center of gravity distribution of the vibration system, making panel vibration more uniform and stable, improving sound quality, and reducing abnormal vibration noise. Furthermore, this design improves the flexibility and versatility of the structural layout, adapting to flexible display panels of different sizes and shapes, thereby enhancing product mass production and structural reliability. Another example is that all mass blocks 211b may have the same shape, thus simplifying the sound field. All of these can be designed according to actual needs and will not be elaborated upon here.

[0080] Based on the above embodiments, in addition to a detailed description of the moving part structure 210a based on the sound generation principle of the moving part structure 210a and the coil structure 221 in the flexible display panel, this disclosure also describes other structures in the coil layer 220 besides the coil structure 221.

[0081] For example, in a flexible display panel provided in one embodiment of this disclosure, such as Figure 5 and Figure 6As shown, the coil layer 220 also includes a control component 222, which is located on the side of the coil structure 221 opposite to the mover layer 210. The control component 222 includes a sound driving module. The coil structure 221 and the control component 222 are electrically connected by wire bonding. Specifically, the wire bonding connects the coil structure 221 and the control component 222 into a whole, forming the stator in the flexible display panel, which is a stationary fixed component that does not vibrate during the sound generation process. Its main function is to generate a changing magnetic field after being energized, providing driving force for the vibration of the mover structure 210a, and cooperating with the mover structure 210a to complete the sound generation action.

[0082] Thus, during the sound generation process in which the moving substructure 210a and the coil structure 221 work together, the control component 222 provides a sound driving module that can control the magnitude and direction of the current on the coil structure 221, thereby controlling the intensity and direction of the magnetic field generated by the coil structure 221 and changing the sound generation accordingly. Ultimately, this changes the magnetic field force on the moving substructure 210a, causing the moving substructure 210a to vibrate or move in the magnetic field, thereby realizing the sound generation of the flexible display panel.

[0083] In addition to controlling the sound output function of the flexible display panel, the control component 222 can also control other functions such as touch function.

[0084] For example, in at least one embodiment of the flexible display panel provided in this disclosure, the control component 222 further includes a touch module. Thus, the sound driving module 200, in addition to its sound function in conjunction with the flexible display panel, can also achieve touch functionality. Specifically, after the touch feedback module of the flexible display panel transmits the data to the control component of the flexible display panel, the control component 222 feeds back to the touch module to control the sound driving unit 200a to perform unidirectional displacement or vibration at multiple different frequencies. This causes deformation of the sound driving module in the corresponding area of ​​the sound driving unit 200a. The deformation process is directly transmitted to the user's finger, allowing the user to receive feedback information, ultimately realizing the touch function of the flexible display panel. Thus, the flexible display panel of this disclosure combines the advantages of a flexible screen, with the driving unit 200a as an independent unit, controlled by touch and algorithms, to achieve vibration feedback of raised, recessed, or single-point multi-frequency modes corresponding to the touch point on the screen area. This enhances the realism of screen information feedback and improves the human-computer interaction effect.

[0085] In at least one embodiment of the flexible display panel provided in this disclosure, the driving module is a flexible circuit board 222a, and multiple flexible circuit boards 222a are provided, each corresponding to a coil structure 221. The coil structure 221 and the flexible circuit board 222a are assembled together by welding, such as ultrasonic welding and adhesive bonding. This helps to improve the stability of the structure and the precision of controlling the circuit of each coil structure 221, thereby improving the uniformity and stability of the sound emission function of the flexible display panel and enhancing the user experience.

[0086] In the flexible display panel provided in at least one embodiment of this disclosure, such as Figure 6 As shown, the orthographic projection of the flexible circuit board 222a onto the flexible display substrate 100 covers the orthographic projection of the coil structure 221 onto the flexible display substrate 100. Thus, this design not only ensures that the magnetic field of the coil structure 221 acts entirely on the flexible circuit board 222a, allowing for direct power transmission without magnetic field leakage and improving power transmission accuracy, but also ensures uniform feedback at any touch position on the flexible display panel, effectively improving touch feedback accuracy and touch experience.

[0087] It should be noted that the structure of the flexible display panel disclosed herein is not limited to the examples above. For example, the orthographic projection of the flexible circuit board 222a on the flexible display substrate 100 may at least partially overlap with the orthographic projection of the covering mass block 211b on the flexible display substrate 100. For example, the flexible circuit board 222a is located in the non-display area of ​​the sound driving module, and it can be any non-display area of ​​the screen of the flexible display panel, including the bottom bezel, left and right bezels, etc. For example, the flexible circuit board 222a may overlap with the area located on the bottom bezel. For example, as... Figure 1 As shown, the bottom bezel of the flexible display panel is equipped with a control panel FPC, which integrates core components such as driving circuits, control chips, and interface circuits. It is responsible for receiving, processing, and distributing various signals and coordinating the work of various subsystems of the panel. That is, the control panel FPC can process the corresponding signals from the sound driving module 200 to drive the sound driving module and the touch module. All of these can be designed according to actual needs, and will not be elaborated here.

[0088] In one embodiment of the flexible display panel provided in this disclosure, the flexible display panel further includes an adhesive layer 300. The adhesive layer 300 is disposed on the side of the mover layer 210 near the flexible display substrate 100.

[0089] For example, such as Figure 7As shown, the flexible display panel includes a flexible display substrate 100, an adhesive layer 300, a mover layer 210, and a coil layer 220. The adhesive layer 300 is disposed on the flexible display substrate 100, specifically on the backlight side of the flexible display substrate 100. The mover layer 210 is located on the side of the adhesive layer 300 facing away from the flexible display substrate 100, and the coil layer 220 is located on the side of the mover layer 210 facing away from the flexible display substrate 100. In this way, the mover layer 210 and the coil layer 220, which constitute the sound driving module 200, are integrated with the flexible display substrate 100 using the adhesive layer 300. Compared with the external mounting method, the adhesive layer 300 is relatively thin and has the characteristics of uniform bonding, high-strength bonding, and simple operation. Therefore, while improving the thinness of the flexible display panel, it also improves the structural stability and production efficiency of the flexible display panel.

[0090] In one embodiment of the flexible display panel provided in this disclosure, the flexible display panel further includes an electromagnetic shielding layer 400, which is disposed between the flexible display substrate 100 and the mover layer 210.

[0091] For example, such as Figure 8 As shown, the flexible display panel includes a coil layer 220, a mover layer 210, an adhesive layer 300, an electromagnetic shielding layer 400, and a flexible display substrate 100 stacked sequentially. The electromagnetic shielding layer 400 can improve the problem of the flexible display panel easily attracting foreign objects during use or carrying, which can lead to damage to the screen.

[0092] In the flexible display panel provided in at least one embodiment of this disclosure, the electromagnetic shielding layer 400 is any one of a copper foil layer, an aluminum foil layer, or a nickel-iron alloy layer.

[0093] In addition to the electromagnetic shielding layer 400 and the adhesive layer 300, the flexible display panel in this embodiment also includes other structures.

[0094] For example, in the flexible display panel provided in at least one embodiment of this disclosure, such as Figure 9 As shown, the flexible display panel also includes a support layer 500, which is disposed between the electromagnetic shielding layer 400 and the flexible display substrate 100.

[0095] For example, such as Figure 9 As shown, the flexible display panel includes a coil layer 220, a mover layer 210, an adhesive layer 300, an electromagnetic shielding layer 400, a support layer 500, and a flexible display substrate 100 stacked sequentially. The electromagnetic shielding layer 400 is attached to the support layer 500. The electromagnetic shielding layer 400 can improve the problem of foreign matter adsorption on the flexible display panel caused by the magnetic field generated by the sound driving module 200, without affecting the normal function of the flexible display panel.

[0096] For example, in the flexible display panel provided in at least one embodiment of this disclosure, such as Figure 10 As shown, the flexible display panel also includes a polarizer 600, which is disposed on the side of the flexible display substrate 100 away from the electromagnetic shielding layer 400.

[0097] For example, such as Figure 10 As shown, the flexible display panel includes a coil layer 220, a mover layer 210, an adhesive layer 300, an electromagnetic shielding layer 400, a support layer 500, a flexible display substrate 100, and a polarizer 600 stacked in sequence.

[0098] For example, such as Figure 11 The flexible display panel shown also includes a coil layer 220, a mover layer 210, an adhesive layer 300, an electromagnetic shielding layer 400, a support layer 500, a flexible display substrate 100, a polarizer 600, and a cover plate 700 stacked in sequence. The cover plate 700 is attached to the side of the polarizer 600 away from the flexible display substrate 100 by an adhesive layer 800.

[0099] It should be noted that the structure of the flexible display panel disclosed herein is not limited to the examples above; for example, refer to... Figure 12 As shown, the integration of the coil layer 220 and the mover layer 210 onto the flexible display substrate 100 is not limited to using the adhesive layer 300; other methods can be selected according to actual needs. Specific limitations are placed on the film layer structures in the flexible display panel, such as the support layer 500, polarizer 600, adhesive layer 300, and cover plate 700. These can be designed according to actual needs and will not be elaborated upon here.

[0100] This disclosure also provides a method for fabricating a flexible display panel, the method comprising providing a flexible display substrate, the flexible display substrate including a display area; forming a sound driving module on the flexible display substrate, the sound driving module including a plurality of sound driving units, the orthographic projection of the plurality of sound driving units on the flexible display substrate falling within the display area.

[0101] For example, as shown in the figure, such as Figure 13 As shown, the method for manufacturing this flexible display panel includes the following steps: Step S100: Provide a flexible display substrate, the flexible display substrate including a display area.

[0102] Step S200: A sound driving module is formed on one side of the flexible display substrate. The sound driving module includes multiple sound driving units, and at least some of the sound driving units have their orthogonal projections on the flexible display substrate falling within the display area.

[0103] In this fabrication method, the sound driving module is integrated with the flexible display substrate. Compared to the externally mounted flexible display panel, the resulting flexible display panel has a reduced overall thickness and weight, and is relatively easier to carry. The structure of the sound driving module and the flexible display substrate can be referred to in the above embodiments, and will not be repeated here.

[0104] In one embodiment of the flexible display panel manufacturing method provided in this invention, such as Figure 14 As shown, step S200, which involves forming a sound driving module on the flexible display substrate, includes: Step S210: Form a motor layer, which includes multiple motor structures.

[0105] For example, such as Figure 15 As shown, the mover layer 210 includes multiple mover structures 210a. Each mover structure 210a includes a magnetic body 212 and a shell 211 including a mass block 211b. According to the array arrangement required by the flexible display panel design, the magnetic body 212 and the shell 211 including the mass block 211b are placed into a mold for positioning, and in-mold injection molding is performed. The plastic precisely covers the structure, and elastic arms 213 are formed around the periphery, ultimately forming the mover layer 210. The plastic resin used in the injection molding process can include any of the following: acrylonitrile butadiene styrene copolymer (ABS), polycarbonate (PC), or thermoplastic polyurethane (TPU). Furthermore, the specific structure and array arrangement of the mover structure 210a, as well as the specific operation and parameters of the injection molding, can be designed according to actual needs and will not be elaborated here.

[0106] Step S220: Form a coil layer, which includes multiple coil structures, with the openings of the coil structures connected in a direction perpendicular to the flexible display substrate.

[0107] For example, such as Figure 15 As shown, the coil layer 220 includes multiple coil structures 221, and the openings of the coil structures 221 are connected in a direction perpendicular to the flexible display substrate 100, i.e., perpendicular to the thickness of the flexible display substrate 100. Specifically, a structural housing adapted to the housing 211 in the mover layer 210 is formed by injection molding, and then the coil structures 221 are positioned by a fixture and then bonded together, or the coil layer 220 is formed by in-film molding. The coil layer 220 may also include a flexible circuit board 222a, which is bonded to one side of the coil structure 221 by positioning by a fixture or by in-film molding, and the flexible circuit board 222a corresponds one-to-one with the coil structure 221.

[0108] Specifically, the shell 211 formed by the injection molding process is a plastic shell, and the material of the plastic shell is at least one of acrylonitrile butadiene styrene copolymer (ABS), polycarbonate (PC), and thermoplastic polyurethane (TPU).

[0109] Step S230: Assemble the moving layer and the coil layer together to form a sound driving module.

[0110] For example, such as Figure 15 As shown, the moving element layer 210 and the coil layer 220 are assembled together by adhesive bonding or ultrasonic welding to form a sound driving module 200. When the coil layer 220 includes a flexible circuit board 222a, the flexible circuit board 222a is positioned away from the moving element layer 210.

[0111] Step S240: Attach the sound driving module to one side of the flexible display substrate, with the moving layer close to the flexible display substrate.

[0112] For example, such as Figure 15 As shown, an adhesive layer 300 is formed on the side of the mover layer 210 away from the coil layer 220, and the sound driving module 200 is attached to the flexible display substrate 100 using the adhesive layer 300.

[0113] In the above preparation method, the mover and stator in the sound driving module 200 are formed into mover layer 210 and coil layer 220 respectively through separate process molding. They are then assembled together through precise positioning and finally combined with the display module to form a multifunctional integrated flexible display panel that integrates sound generation function and tactile feedback function.

[0114] In another embodiment of the present invention, a method for manufacturing a flexible display panel is provided, such as... Figure 16 As shown, step S200, which involves forming a sound driving module on the flexible display substrate, includes: Step S210a: Form a kinetic layer, which includes multiple kinetic structures. The steps for forming the kinetic layer can be found in the example above and will not be repeated here.

[0115] Step S220a: Attach the moving layer to the flexible display substrate.

[0116] For example, such as Figure 17As shown, the mover layer 210 includes multiple mover structures 210a. Each mover structure 210a includes a housing 211 and a magnetic body 212. The magnetic body 212 includes a frame 212a and a magnetic block 212b. The frame 212a is a cavity B with an opening, and the magnetic block 212b is located inside the cavity of the frame 212a and extends in the direction of its opening. An adhesive layer 300 is formed on the side of the mover layer 210 away from the opening of the frame 212a. The mover layer 210 is then bonded to the flexible display substrate 100, for example, the backlight side of the flexible display substrate 100, using the adhesive layer 300.

[0117] Step S230a: Form a coil layer, which includes multiple coil structures, the openings of which are connected in a direction perpendicular to the flexible display substrate. The steps for forming the coil layer can be referred to in the above embodiments and will not be repeated here.

[0118] Step S240a: Assemble the coil layer and the mover layer together to form a sound driving module.

[0119] For example, such as Figure 16 As shown, the prepared coil layer 220 is assembled together with the mover layer 210 attached to the flexible display panel to finally form a sound driving module 200 attached to the flexible display substrate 100.

[0120] This disclosure also provides a display device, which includes the flexible display panel described in the above embodiments or a flexible display panel obtained by the preparation method described in the above embodiments.

[0121] In the embodiments of this disclosure, the display device may be an organic light-emitting diode display device, a liquid crystal display device, an electronic paper display device, etc.

[0122] For example, the display device in the embodiments of this disclosure can be any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator.

[0123] It should be noted that the embodiments disclosed herein do not describe all the structures of the display panel described above. To achieve the necessary functions of the display panel, those skilled in the art can configure other structures according to specific application scenarios.

[0124] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications or equivalent substitutions made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A flexible display panel, characterized in that, include: Flexible display substrate, including a display area; and A sound driving module is disposed on one side of the flexible display substrate and includes multiple sound driving units, at least some of the sound driving units having their orthogonal projections on the flexible display substrate falling within the display area.

2. The flexible display panel according to claim 1, characterized in that, The sound driving module includes: A moving element layer is disposed on one side of the flexible display substrate and includes multiple moving element structures; and A coil layer is disposed on the side of the moving element layer away from the flexible display substrate. The coil layer includes multiple coil structures, and the openings of the coil structures are connected in a direction perpendicular to the flexible display substrate. The moving part structure and the coil structure correspond one-to-one. Each group of the moving part structure and the coil structure constitutes a sound driving unit. The moving part structure is configured to reciprocate within the coil structure in a direction perpendicular to the flexible display substrate. Preferably, a plurality of the moving substructures are arranged in an array.

3. The flexible display panel according to claim 2, characterized in that, The mover structure includes: A housing includes a main body and a plurality of mass blocks, each of the mass blocks being elastically connected to the main body of the housing, at least one of the mass blocks enclosing a receiving space, and the coil structure being located within the receiving space; and A magnetic body includes a frame and a magnetic block, wherein the frame is a cavity with an opening, and the magnetic block is located inside the cavity and extends from the bottom of the frame toward the opening of the frame; The magnetic body is located within the accommodating space, and the opening of the frame is away from the flexible display substrate, so that the magnetic block extends into the coil structure. The magnetic block reciprocates in a direction perpendicular to the flexible display substrate in response to changes in the magnetic field around the coil structure. Preferably, the frame and the mass block are seamlessly connected.

4. The flexible display panel according to claim 3, characterized in that, The mass block is elastically connected to the main body of the housing via a spring arm; Preferably, the cross-sectional shape of the elastic arm is S-shaped in the direction parallel to the flexible display substrate; Preferably, multiple elastic arms are provided, and a mass block surrounds and forms the receiving space. The mass block is an integral structure, and the elastic arms are evenly distributed on the mass block. Preferably, in a direction parallel to the flexible display substrate, the cross-sectional shape of the mass block of the integrated structure is annular.

5. The flexible display panel according to claim 3, characterized in that, The coil layer also includes a control component located on the side of the coil structure opposite to the moving part layer, and the control component includes a sound driving module; Preferably, the control component includes a flexible circuit board, and multiple flexible circuit boards are provided, each corresponding to one of the coil structures; Preferably, the orthographic projection of the flexible circuit board on the flexible display substrate covers the orthographic projections of the coil structure and the mass block on the flexible display substrate; Preferably, the control component further includes a touch module.

6. The flexible display panel according to any one of claims 2-5, characterized in that, It also includes an adhesive layer disposed on the side of the moving element layer near the flexible display substrate.

7. The flexible display panel according to any one of claims 2-5, characterized in that, It also includes an electromagnetic shielding layer, which is disposed between the flexible display substrate and the moving element layer; Preferably, the electromagnetic shielding layer is any one of a copper foil layer, an aluminum foil layer, or a nickel-iron alloy layer; Preferably, it further includes a support layer disposed between the electromagnetic shielding layer and the flexible display substrate; Preferably, the system further includes a polarizer disposed on the side of the flexible display substrate facing away from the electromagnetic shielding layer.

8. A method for preparing a flexible display panel, characterized in that, include: A flexible display substrate is provided, the flexible display substrate including a display area; A sound driving module is formed on one side of the flexible display substrate. The sound driving module includes a plurality of sound driving units, and at least a portion of the sound driving units have their orthogonal projections on the flexible display substrate falling within the display area.

9. The preparation method according to claim 8, characterized in that, The method of forming a sound driving module on one side of the flexible display substrate includes: forming a moving element layer, the moving element layer including a plurality of moving element structures; forming a coil layer, the coil layer including a plurality of coil structures, the openings of the coil structures communicating in a direction perpendicular to the flexible display substrate; assembling the moving element layer and the coil layer together to form a sound driving module; and attaching the sound driving module to one side of the flexible display substrate, with the moving element layer close to the flexible display substrate. or, The method of forming a sound driving module on one side of the flexible display substrate includes: forming a mover layer, the mover layer including a plurality of mover structures; attaching the mover layer to one side of the flexible display substrate; forming a coil layer, the coil layer including a plurality of coil structures, the openings of the coil structures communicating in a direction perpendicular to the flexible display substrate; and assembling the coil layer and the mover layer together to form the sound driving module.

10. A display device, characterized in that, Includes the flexible display panel according to any one of claims 1-7 or the flexible display panel obtained by the preparation method according to claim 8 or 9.

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