Display device and method for manufacturing a display device

Abstract

The application discloses a display device and a manufacturing method thereof, and belongs to the technical field of display. The display device comprises a display panel and at least one piezoelectric sound production structure. The substrate comprises a display part, a bending part and an extension part, and the extension part is bent to the back of the display part. The piezoelectric sound production structure is located on the extension part of the display panel. The piezoelectric sound production structure can vibrate under the driving of an electric signal and drive the display panel to vibrate, so that the piezoelectric sound production structure can realize the function of converting the electric signal of audio into a sound wave signal, and the display device can realize the function of sound production. By integrating the piezoelectric sound production structure on the extension part of the display panel, the space occupied by the piezoelectric sound production structure on the display panel can be reduced, so that the size of the display device can be reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display device and a method for manufacturing the display device. Background Technology

[0002] A display device is a device with display function.

[0003] A display device includes a display panel, a frame, and a speaker, the speaker being fixed to the display panel via the frame. The speaker converts electrical signals into sound signals, enabling the display device to emit sound.

[0004] However, the aforementioned speakers would result in a larger display device size. Summary of the Invention

[0005] This application provides a display device and a method for manufacturing the display device. The technical solution is as follows:

[0006] According to a first aspect of this application, a display device is provided, the display device comprising:

[0007] The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion. The light-emitting functional layer is located on a first surface of the display portion. The extension portion is located outside a second surface of the display portion. The bent portion is connected to the display portion and the extension portion respectively. The second surface is the opposite surface to the first surface.

[0008] At least one piezoelectric sound-generating structure is located on the extension.

[0009] Optionally, the substrate has at least one opening corresponding to the at least one piezoelectric sound-generating structure, and the orthographic projection of the piezoelectric sound-generating structure on the substrate overlaps with the orthographic projection of the corresponding opening on the substrate.

[0010] Optionally, the substrate includes an insulating layer, the piezoelectric sound-generating structure is located on the insulating layer, the opening is a blind hole, and the bottom of the opening is the insulating layer.

[0011] Optionally, the at least one piezoelectric sound-generating structure includes a first piezoelectric sound-generating structure located on the side of the extension away from the display portion.

[0012] Optionally, the number of the piezoelectric sound-generating structures is at least two, and the display device further includes a second piezoelectric sound-generating structure located on the extension. The frequency response range of the first piezoelectric sound-generating structure is different from that of the second piezoelectric sound-generating structure.

[0013] Optionally, the second piezoelectric sound-generating structure is located on the side of the extension near the display portion.

[0014] Optionally, the substrate includes a substrate and a circuit structure located on the substrate;

[0015] The circuit structure includes a gate pattern and a source / drain pattern, and the light-emitting functional layer includes an anode pattern, a light-emitting layer, and a cathode pattern.

[0016] The piezoelectric sound-generating structure includes a wire, a driver chip, a first electrode, a piezoelectric layer, and a second electrode stacked sequentially along a direction away from the extension portion. The first electrode and the second electrode are electrically connected to the driver chip through the wire.

[0017] The first electrode and the gate pattern or the source-drain pattern are in the same layer, the second electrode and the anode pattern are in the same layer, and the wire and the gate pattern or the source-drain pattern are in the same layer.

[0018] Optionally, the piezoelectric sound-generating structure includes a driving chip, a first electrode, a piezoelectric layer, and a second electrode sequentially stacked along a direction away from the extension;

[0019] The display device further includes leads, one end of which is electrically connected to the first electrode or the second electrode, and the other end of which is electrically connected to the driver chip. The leads include conductive silver paste.

[0020] Optionally, the number of the piezoelectric sound-generating structures is at least two, and the at least two piezoelectric sound-generating structures are stacked on the extension.

[0021] On the other hand, a method for manufacturing a display device is provided, the method comprising:

[0022] A display panel is obtained, the display panel including a substrate and a light-emitting functional layer, the substrate including a display part, a bent part and an extension part, the light-emitting functional layer being located on a first surface of the display part, the extension part being located outside a second surface of the display part, the bent part being connected to the display part and the extension part respectively, and the second surface being the opposite surface to the first surface;

[0023] At least one piezoelectric sound-generating structure is formed on the display panel, and the at least one piezoelectric sound-generating structure is located on the extension.

[0024] The beneficial effects of the technical solutions provided in this application include at least the following:

[0025] A display device is provided, comprising a display panel and at least one piezoelectric sound-generating structure. The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion, the extension portion being bent to the back side of the display portion. The piezoelectric sound-generating structure is located on the extension portion of the display panel. The piezoelectric sound-generating structure can vibrate under the drive of an electrical signal, causing the display panel to vibrate. Thus, the piezoelectric sound-generating structure can convert audio electrical signals into sound wave signals, thereby enabling the display device to generate sound. By integrating the piezoelectric sound-generating structure onto the extension portion of the display panel, the space occupied by the piezoelectric sound-generating structure on the display panel can be reduced, thereby reducing the size of the display device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a top view of a display device provided in an embodiment of this application;

[0028] Figure 2 yes Figure 1 A cross-sectional structural schematic diagram of the provided display device;

[0029] Figure 3 This is a cross-sectional structural schematic diagram of another display device provided in an embodiment of this application;

[0030] Figure 4 yes Figure 3 An enlarged schematic diagram of a portion of the structure of the provided display device;

[0031] Figure 5 This is a cross-sectional structural diagram of a portion of a display device provided in an embodiment of this application;

[0032] Figure 6 This is a cross-sectional structural schematic diagram of another display device provided in an embodiment of this application;

[0033] Figure 7 This is a top view of another display device provided in an embodiment of this application;

[0034] Figure 8 yes Figure 7 A cross-sectional structural schematic diagram of the provided display device;

[0035] Figure 9This is a cross-sectional structural schematic diagram of another display device provided in an embodiment of this application;

[0036] Figure 10 This is a cross-sectional structural schematic diagram of another display device provided in an embodiment of this application;

[0037] Figure 11 This is a cross-sectional structural diagram of a partial structure of another display device provided in an embodiment of this application;

[0038] Figure 12 This is a flowchart illustrating a method for manufacturing a display device according to an embodiment of this application;

[0039] Figure 13 This is a flowchart of another method for manufacturing a display device provided in the embodiments of this application;

[0040] Figure 14 This is a flowchart of another method for manufacturing a display device provided in the embodiments of this application.

[0041] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0043] This application provides a display device; please refer to... Figure 1 and Figure 2 , Figure 1 This is a top view schematic diagram of a display device provided in an embodiment of this application. Figure 2 yes Figure 1 A cross-sectional structural schematic diagram of the provided display device ( Figure 2 It can be Figure 1 (A cross-sectional structural schematic diagram of the provided display device at B1-B1), the display device 10 includes:

[0044] Display panel 11 includes substrate 111 and light-emitting functional layer 112. Substrate 111 includes display part A1, bending part A2 and extension part A3. Light-emitting functional layer 112 is located on the first surface A11 of display part A1. Extension part A3 is located outside the second surface A12 of display part A1. Bending part A2 is connected to display part A1 and extension part A3 respectively. Second surface A12 is the other side opposite to first surface A11.

[0045] At least one piezoelectric sound-generating structure 12 is located on the extension A3.

[0046] It should be noted that, Figure 1 and Figure 2 The illustration shows the piezoelectric sound-generating structure 12 located on the side A32 of the extension A3 away from the display A1. The piezoelectric sound-generating structure 12 provided in this embodiment may also be located on the side A31 of the extension A3 closer to the display A1. Figure 1 and Figure 2 The illustration shows a case where there is one piezoelectric sound-generating structure 12. The embodiments of this application may provide more than one piezoelectric sound-generating structure 12, such as two, three, or four. When there are at least two piezoelectric sound-generating structures 12, the piezoelectric sound-generating structure 12 may be located on the side A32 of the extension A3 away from the display A1, and / or on the side A31 of the extension A3 close to the display A1.

[0047] In summary, this application provides a display device including a display panel and at least one piezoelectric sound-generating structure. The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion, with the extension portion bent to the back side of the display portion. The piezoelectric sound-generating structure is located on the extension portion of the display panel. Driven by an electrical signal, the piezoelectric sound-generating structure vibrates, causing the display panel to vibrate. This allows the piezoelectric sound-generating structure to convert audio electrical signals into sound wave signals, thereby enabling the display device to generate sound. By integrating the piezoelectric sound-generating structure onto the extension portion of the display panel, the space occupied by the piezoelectric sound-generating structure on the display panel can be reduced, thereby reducing the size of the display device.

[0048] In one exemplary embodiment, please refer to Figure 3 , Figure 3 This is a cross-sectional structural schematic diagram of another display device provided in an embodiment of this application. The display device 10 includes: a display panel 11, which includes a substrate 111 and a light-emitting functional layer 112. The substrate 111 includes a display portion A1, a bent portion A2, and an extension portion A3. The light-emitting functional layer 112 is located on the first surface A11 of the display portion A1, and the extension portion A3 is located outside the second surface A12 of the display portion A1. The bent portion A2 is connected to both the display portion A1 and the extension portion A3. The second surface A12 is the opposite surface to the first surface A11. At least one piezoelectric sound-emitting structure 12 is located on the extension portion A3.

[0049] The display panel provided in this application embodiment can be a display panel packaged using a chip-on-pi (COP) flexible material or similar method. The substrate 111 may include a substrate 1111 and an insulating layer 1112 located on the substrate 1111. The substrate 1111 can be used to support other film layers in the display panel 11. The substrate 1111 can be a flexible substrate with bendable characteristics, which facilitates the bending of the extension A3 to the outside of the second surface A12 of the display portion A1, thereby reducing the area of ​​the display panel 11 and enabling the display device 10 to achieve a narrow bezel effect. For example, the material of the substrate 1111 may include polyimide (PI) or other flexible materials.

[0050] The piezoelectric sound-generating structure 12 provided in this application embodiment can convert audio electrical signals into sound wave signals through the piezoelectric effect of the piezoelectric material. The vibration of the piezoelectric material drives the display panel to vibrate, thereby enabling the display device to generate sound. Specifically, when a voltage is applied to the piezoelectric material, the material deforms, causing mechanical vibration, which in turn drives the display panel to vibrate and generate sound waves. When no voltage is applied to the piezoelectric material, the deformation disappears. For example, the piezoelectric sound-generating structure 12 provided in this application embodiment can be a piezoelectric micromachined ultrasonic transducer (PMUT), a device that converts electrical energy into mechanical vibration energy, enabling the emission of sound waves. Figure 3 The piezoelectric sound-generating structure 12 shown is rectangular in shape when projected onto the substrate 111. However, the shape of the piezoelectric sound-generating structure 12 projected onto the substrate 111 in the embodiments of this application may also include circles or polygons, etc. This application does not impose any limitations on this.

[0051] Optionally, the substrate 111 has at least one opening K1 corresponding to at least one piezoelectric sound-generating structure 12, and the orthographic projection of the piezoelectric sound-generating structure 12 on the substrate 111 overlaps with the orthographic projection of the corresponding opening on the substrate 111. This opening K1 can provide a vibration cavity for the piezoelectric sound-generating structure 12, thereby avoiding the problem of poor sound emission from the display device 10 due to insufficient vibration space for the piezoelectric sound-generating structure 12. Furthermore, the opening K1 can prevent the substrate 111, which is attached to the piezoelectric sound-generating structure 12, from restricting the vibration amplitude of the piezoelectric sound-generating structure 12, thus ensuring the sound pressure level of the piezoelectric sound-generating structure 12.

[0052] Alternatively, please refer to Figure 3 and Figure 4 , Figure 4 yes Figure 3Enlarged schematic diagram of part of the structure of the provided display device ( Figure 4 It can be Figure 3 (The provided diagram shows an enlarged view of a portion of the structure of the display device in region C1). The substrate 111 includes an insulating layer 1112, and the piezoelectric sound-generating structure 12 is located on the insulating layer. The opening K1 is a blind hole, and the bottom of the opening K1 is the insulating layer 1112, meaning that the opening K1 does not penetrate the substrate 111. An insulating layer 1112 also exists between the opening K1 and the piezoelectric sound-generating structure 12. The insulating layer 1112 at the bottom of the opening K1 can provide support for the piezoelectric sound-generating structure 12 during its formation, thereby increasing its stability. Furthermore, the insulating layer 1112 between the opening K1 and the piezoelectric sound-generating structure 12 can be a portion of the insulating layer 1112 in a direction perpendicular to the substrate 1111; this application does not limit this. The thickness H1 of the insulating layer 1112 located between the opening K1 and the piezoelectric sound-generating structure 12 can be positively correlated with the area of ​​the orthogonal projection of the piezoelectric sound-generating structure 12 onto the substrate 1111. That is, the larger the area of ​​the orthogonal projection of the piezoelectric sound-generating structure 12 onto the substrate 1111, the larger the thickness H1 of the insulating layer 1112 located between the opening K1 and the piezoelectric sound-generating structure 12, so as to ensure the stability of the piezoelectric sound-generating structure 12. For example, the thickness H1 of the insulating layer 1112 located between the opening K1 and the piezoelectric sound-generating structure 12 can range from 10 nanometers to 500 nanometers.

[0053] Figure 3 and Figure 4 The illustration shows a case where the openings on the substrate provide a vibration cavity for the piezoelectric sound-generating structure. This application also presents another type of vibration cavity; please refer to [reference needed]. Figure 5 , Figure 5 This is a cross-sectional structural diagram of a portion of a display device provided in an embodiment of this application. The piezoelectric sound-generating structure 12 includes a first piezoelectric sound-generating structure D1, which is located on the side A32 of the extension A3 away from the display portion A1. The first piezoelectric sound-generating structure D1 includes a vibration structure D11 and a support structure D12. The support structure D12 can be an annular structure including an opening K2. The opening K2 can provide a vibration cavity for the first piezoelectric sound-generating structure D1, thereby avoiding the problem of poor sound generation effect of the display device 10 due to insufficient vibration space of the piezoelectric sound-generating structure 12. In addition, the opening K2 can also prevent the substrate 111 attached to the piezoelectric sound-generating structure 12 from restricting the vibration amplitude of the piezoelectric sound-generating structure 12, thereby ensuring the sound pressure of the piezoelectric sound-generating structure 12. Compared to Figure 5 The vibrating cavity shown, Figure 4 The vibration cavity shown can be formed directly on the substrate 111, which simplifies the process and reduces the thickness of the piezoelectric sound-generating structure 12, thereby reducing the size of the display device.

[0054] In the display device provided in this application embodiment, the number of piezoelectric sound-generating structures can be at least two. For example, the piezoelectric sound-generating structures may include a first piezoelectric sound-generating structure and a second piezoelectric sound-generating structure. Please refer to... Figure 6 , Figure 6 This is a cross-sectional structural diagram of another display device provided in an embodiment of this application. The piezoelectric sound-generating structure 12 includes a first piezoelectric sound-generating structure D1 and a second piezoelectric sound-generating structure D2. The first piezoelectric sound-generating structure D1 is located on the side A32 of the extension A3 away from the display part A1, and the second piezoelectric sound-generating structure D2 is located on the side A31 of the extension A3 close to the display part A1. The frequency response range of the first piezoelectric sound-generating structure D1 is different from that of the second piezoelectric sound-generating structure D2. The frequency response range refers to the frequency range of sound that the piezoelectric sound-generating structure 12 can generate and transmit. For example, the frequency of sound that the first piezoelectric sound-generating structure D1 can generate and transmit can be higher than the frequency of sound that the second piezoelectric sound-generating structure D2 can generate and transmit. The frequency response range of the first piezoelectric sound-generating structure D1 can be 1000 Hz to 20000 Hz, and the frequency response range of the second piezoelectric sound-generating structure D2 can be 250 Hz to 4000 Hz. By combining the first piezoelectric sound-generating structure D1 with the second piezoelectric sound-generating structure D2, the frequency response range of the piezoelectric sound-generating structure 12 can correspond to different audio frequency bands, thereby enhancing the richness of the sound layers of the display device 10 and thus improving the sound effect of the display device.

[0055] Furthermore, both the first piezoelectric sound-generating structure D1 and the second piezoelectric sound-generating structure D2 can include multiple sub-piezoelectric sound-generating structures, and the frequency response ranges of the multiple sub-piezoelectric sound-generating structures are different. For example, the frequency response ranges of the multiple sub-piezoelectric sound-generating structures can respectively correspond to the high-frequency band, the mid-frequency band, the low-frequency band, the ultra-low-frequency band, and the ultra-high-frequency band. By cooperating with multiple sub-piezoelectric sound-generating structures, the frequency response range of the piezoelectric sound-generating structure 12 can correspond to more audio frequency bands, which can further enhance the richness of the sound layers of the display device 10, thereby further improving the sound emission effect of the display device.

[0056] In one exemplary embodiment, please refer to Figure 6The orthographic projection of the first piezoelectric sound-generating structure D1 on the substrate 111 overlaps with the orthographic projection of the second piezoelectric sound-generating structure D2 on the substrate 111. The substrate 111 has openings K1 corresponding to the first and second piezoelectric sound-generating structures D1 and D2, respectively. The orthographic projections of both structures overlap with the orthographic projections of their corresponding openings K1 on the substrate 111, meaning that the first and second piezoelectric sound-generating structures D1 and D2 can share a single vibration cavity, thus providing sufficient vibration space for the piezoelectric sound-generating structure 12. In the display device provided in this embodiment, the orthographic projection of the first piezoelectric sound-generating structure D1 on the substrate 111 can also be located outside the orthographic projection of the second piezoelectric sound-generating structure D2 on the substrate 111. The substrate 111 has two openings corresponding to the first and second piezoelectric sound-generating structures D1 and D2, respectively. This embodiment does not impose any limitations on this.

[0057] The above describes the case where at least two piezoelectric sound-generating structures are located on opposite sides of the extension. In the display device provided in this application embodiment, the at least two piezoelectric sound-generating structures may also be located on the same side of the extension. For example, the piezoelectric sound-generating structure may further include a third piezoelectric sound-generating structure, with both the first and third piezoelectric sound-generating structures located on the same side of the extension. Please refer to... Figure 7 and Figure 8 , Figure 7 This is a top view schematic diagram of another display device provided in an embodiment of this application. Figure 8 yes Figure 7 A cross-sectional structural schematic diagram of the provided display device ( Figure 8 It can be Figure 7 (A cross-sectional view of another display device at B2-B2 is provided). The display device 10 includes: a display panel 11, which includes a substrate 111 and a light-emitting functional layer 112. The substrate 111 includes a display portion A1, a bent portion A2, and an extension portion A3. The light-emitting functional layer 112 is located on the first surface A11 of the display portion A1, and the extension portion A3 is located outside the second surface A12 of the display portion A1. The bent portion A2 is connected to both the display portion A1 and the extension portion A3. The second surface A12 is the opposite surface to the first surface A11. At least one piezoelectric sound-emitting structure 12 is located on the extension portion A3.

[0058] The piezoelectric sound-generating structure 12 includes a first piezoelectric sound-generating structure D1 and a third piezoelectric sound-generating structure D3, both located on the side A32 of the extension A3 away from the display section A1. For large-size display devices, the first piezoelectric sound-generating structure D1 and the third piezoelectric sound-generating structure D3 can be located on both sides of the extension A3 in a first direction X1, where the two sides of the first direction X1 can be the left and right sides of the display device 10, and there is a specified distance between the first piezoelectric sound-generating structure D1 and the third piezoelectric sound-generating structure D3. The display device can include two sound-generating areas corresponding to the first piezoelectric sound-generating structure D1 and the third piezoelectric sound-generating structure D3, respectively. The first piezoelectric sound-generating structure D1 and the third piezoelectric sound-generating structure D3 can respectively drive the display panel in the corresponding sound-generating area to vibrate under the drive of an electrical signal, thereby enabling the separation of the left and right channels, making the sound more three-dimensional and clear, and thus improving the sound effect of the display device 10. Furthermore, the number of piezoelectric sound-generating structures 12 can be greater than two. More than two piezoelectric sound-generating structures 12 can also be provided on the extension A3, and there is a specified distance between the more than two piezoelectric sound-generating structures 12. This can realize multi-channel sound and make the sound more three-dimensional. This application does not limit this.

[0059] Optionally, at least two piezoelectric sound-generating structures can also be stacked on the extension. Please refer to [reference needed]. Figure 9 , Figure 9 This is a cross-sectional structural diagram of another display device provided in an embodiment of this application. The piezoelectric sound-generating structure 12 includes a first piezoelectric sound-generating structure D1 and a third piezoelectric sound-generating structure D3. Both the first piezoelectric sound-generating structure D1 and the third piezoelectric sound-generating structure D3 are located on the side A32 of the extension A3 away from the display part A1, and the first piezoelectric sound-generating structure D1 and the third piezoelectric sound-generating structure D3 are stacked on the extension A3 in a direction away from the display part A1. The area of ​​the orthogonal projection of the first piezoelectric sound-generating structure D1 on the substrate 111 can be larger than the area of ​​the orthogonal projection of the third piezoelectric sound-generating structure D3 on the substrate 111, thereby improving the stability of the piezoelectric sound-generating structure 12. Alternatively, the area of ​​the orthogonal projection of the first piezoelectric sound-generating structure D1 on the substrate 111 can be equal to the area of ​​the orthogonal projection of the third piezoelectric sound-generating structure D3 on the substrate 111. The area of ​​the orthogonal projection of the piezoelectric sound-generating structure 12 on the substrate 111 can be designed according to the frequency response range of the piezoelectric sound-generating structure 12, and this embodiment of the application does not impose any limitations on this.

[0060] In one exemplary embodiment, please refer to Figure 10 , Figure 10 This is a cross-sectional structural schematic diagram of another display device provided in the embodiments of this application. Figure 10(This can be a cross-sectional structural diagram of the display device before the bent portion is bent). Figure 3 Based on the display device shown, Figure 10 The display device shown may also include other film layer structures. When the piezoelectric sound-generating structure 12 is located on the side A32 of the extension A3 away from the display part A1, the piezoelectric sound-generating structure 12 may be a co-layer structure with some film layer structures of the display device to simplify the process.

[0061] Optionally, the substrate 111 includes a substrate 1111, an insulating layer 1112 located on the substrate 1111, and a circuit structure 1113. The circuit structure 1113 may include a channel layer E1, a gate pattern E2, and a source / drain pattern E3 sequentially disposed along a direction away from the substrate 1111. The substrate 111 may include a low-temperature polysilicon (LTPS) backplane and / or an oxide backplane. Correspondingly, the material of the channel layer E3 may include low-temperature polysilicon and / or oxide, wherein low-temperature polysilicon has high carrier mobility, suitable for driving thin-film transistors to provide stable current, and oxide has high on / off ratio, suitable for controlling thin-film transistors to reduce leakage current and ensure the stability of operating current. The gate pattern E2 may include a single-layer or multi-layer structure. For example, the gate pattern E2 is a double-layer structure, and the gate pattern E2 may include a first gate E21 and a second gate E22 sequentially disposed along a direction away from the substrate 1111. The source / drain pattern E3 may include a source and a drain disposed on the same layer.

[0062] The insulating layer 1112 may include multiple film layers. For example, the insulating layer 1112 may include a buffer layer G1, a first gate insulating layer G2, a second gate insulating layer G3, an interlayer dielectric layer G4, and a planarization layer G5 sequentially disposed in the direction of the substrate 1111. The buffer layer G1 is located between the substrate 1111 and the channel layer E3. The buffer layer G1 can increase the adhesion between the channel layer E3 and the substrate 1111, thereby preventing the channel layer E3 from peeling off. The first gate insulating layer G2 is located between the first gate E21 of the channel layer E3, the second gate insulating layer G3 is located between the first gate E21 and the second gate E22, the interlayer dielectric layer G4 is located between the second gate E22 and the source / drain pattern E2, and the planarization layer G5 is located on the side of the source / drain pattern E2 away from the substrate 1111.

[0063] The light-emitting functional layer 112 includes an anode pattern 1121, a light-emitting layer 1122, and a cathode pattern 1123 arranged sequentially along a direction away from the substrate 1111. The anode pattern 1121 includes multiple anodes, and the cathode pattern 1123 includes multiple cathodes. The anodes and cathodes cooperate to drive the light-emitting layer 1122 to emit light.

[0064] The piezoelectric sound-generating structure 12 is located on the insulating layer 1112. The piezoelectric sound-generating structure 12 includes a wire F4, a driver chip F5, a first electrode F1, a piezoelectric layer F2, and a second electrode F3, which are sequentially stacked along a direction away from the extension A3. The first electrode F1 and the second electrode F3 are electrically connected to the driver chip F5 via the wire F4. The first electrode F1 and the wire F4 can be in the same layer, facilitating their electrical connection. The second electrode F3 can be electrically connected to the wire F4 through a via in the planarization layer G5. The driver chip F5 provides audio drive signals to the first electrode F1 and the second electrode F3, transmitting these signals through the wire F4. The interaction between the first electrode F1 and the second electrode F3 causes the piezoelectric layer F2 to vibrate. This vibration compresses the air, emitting sound waves, thus enabling the display device to generate sound. For example, the material of the piezoelectric layer F2 may include piezoelectric materials such as polyvinylidene fluoride (PVDF), aluminum nitride, or lead zirconate titanate.

[0065] In this design, the first electrode F1 can be on the same layer as the gate pattern E1 or the source / drain pattern E2, the second electrode F3 can be on the same layer as the anode pattern 1121, and the wire F4 can be on the same layer as the gate pattern E1 or the source / drain pattern E2. This simplifies the manufacturing process and reduces costs. Furthermore, by placing the piezoelectric sound-generating structure 12 on the same layer as the circuit structure 1113 in the display panel, it can be integrated onto the display panel 11. Compared to an external sound-generating structure, this reduces the space occupied by the piezoelectric sound-generating structure 12, thereby reducing the size of the display device. Figure 10 The illustration shows the case where the first electrode F1 and the wire F4 are in the same layer as the source and drain pattern E2. The first electrode F1 and the wire F4 can also be in the same layer as the gate pattern E1. Furthermore, the first electrode F1 and the second electrode F3 can also be formed independently through a deposition process. This application does not limit this; for example, the materials of the first electrode F1 and the second electrode F3 may include metallic materials such as molybdenum.

[0066] The substrate 111 has at least one opening K1 corresponding to at least one piezoelectric sound-generating structure 12. The orthographic projection of the piezoelectric sound-generating structure 12 on the substrate 111 overlaps with the orthographic projection of the corresponding opening on the substrate 111. The opening K1 can provide a vibration cavity for the piezoelectric sound-generating structure 12, thereby avoiding the problem of poor sound emission of the display device 10 due to insufficient vibration space of the piezoelectric sound-generating structure 12, and thus improving the sound emission effect of the display device 10. The opening K1 is a blind hole, and the bottom of the opening K1 can be an interlayer dielectric layer G4. The interlayer dielectric layer G4 located at the bottom of the opening K1 can provide support for the piezoelectric sound-generating structure 12.

[0067] The display panel 11 also includes a pixel defining layer 113 and spacers 114. The pixel defining layer 113 is located on the side of the planarization layer G5 away from the substrate 1111, and can be used to divide multiple pixels. The spacers 114 are located on the side of the pixel defining layer away from the substrate 1111, and can prevent color mixing between adjacent pixels.

[0068] In the piezoelectric sound-generating structure provided in this application embodiment, the first electrode or the second electrode can also be electrically connected to the driver chip via external leads. Please refer to [reference needed]. Figure 11 , Figure 11 This is a cross-sectional schematic diagram of a partial structure of another display device provided in this application embodiment. The piezoelectric sound-generating structure 12 includes a driving chip F5, a first electrode F1, a piezoelectric layer F2, and a second electrode F3 sequentially stacked along a direction away from the extension A3. The display device also includes a lead F6, one end of which is electrically connected to the first electrode F1 or the second electrode F3, and the other end of which is electrically connected to the driving chip F5. For example, the material of the lead F6 may include conductive silver paste. The thickness of the lead F6 in the direction perpendicular to the substrate 111 is greater than or equal to 10 micrometers. For example, the thickness of the lead F6 in the direction perpendicular to the substrate 111 can be 15 micrometers, which can ensure the conductivity of the lead F6, thereby ensuring the reliability of the electrical connection between the first electrode F1 or the second electrode F2 and the driving chip F5. The substrate 111 has an opening K1 corresponding to the piezoelectric sound-generating structure 12, and the orthographic projection of the piezoelectric sound-generating structure 12 on the substrate 111 overlaps with the orthographic projection of the corresponding opening on the substrate 111. The opening K1 can provide a vibration cavity for the piezoelectric sound-generating structure 12, thereby avoiding the problem of poor sound effect of the display device due to the small vibration space of the piezoelectric sound-generating structure 12, and thus improving the sound effect of the display device.

[0069] also, Figure 11 The illustration shows the first electrode F1, the piezoelectric layer F2, and the second electrode F3 located on the same surface of the substrate 111 as the driving chip F5. In another embodiment of this application, the first electrode F1, the piezoelectric layer F2, and the second electrode F3 can be located on one surface of the substrate 111, and the second electrode F3 can be located on the other surface of the substrate 111. The substrate 111 can have a through-hole through which the lead F6 can pass, so that the first electrode F1 and the second electrode F3 are electrically connected to the driving chip F5 respectively.

[0070] In summary, this application provides a display device including a display panel and at least one piezoelectric sound-generating structure. The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion, with the extension portion bent to the back side of the display portion. The piezoelectric sound-generating structure is located on the extension portion of the display panel. Driven by an electrical signal, the piezoelectric sound-generating structure vibrates, causing the display panel to vibrate. This allows the piezoelectric sound-generating structure to convert audio electrical signals into sound wave signals, thereby enabling the display device to generate sound. By integrating the piezoelectric sound-generating structure onto the extension portion of the display panel, the space occupied by the piezoelectric sound-generating structure on the display panel can be reduced, thereby reducing the size of the display device.

[0071] On the other hand, embodiments of this application provide a method for manufacturing a display device, please refer to... Figure 12 , Figure 12 This is a flowchart of a method for manufacturing a display device according to an embodiment of this application, the method including:

[0072] Step 1201: Obtain the display panel.

[0073] The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display part, a bent part and an extension part. The light-emitting functional layer is located on a first surface of the display part, the extension part is located outside a second surface of the display part, the bent part is connected to the display part and the extension part respectively, and the second surface is the opposite surface to the first surface.

[0074] Step 1202: Form at least one piezoelectric sound-generating structure on the display panel.

[0075] At least one piezoelectric sound-generating structure is located on the extension.

[0076] In summary, this application provides a method for manufacturing a display device including a display panel and at least one piezoelectric sound-generating structure. The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion, with the extension portion bent to the back side of the display portion. The piezoelectric sound-generating structure is located on the extension portion of the display panel. Driven by an electrical signal, the piezoelectric sound-generating structure vibrates, causing the display panel to vibrate. This allows the piezoelectric sound-generating structure to convert audio electrical signals into sound wave signals, thereby enabling the display device to generate sound. By integrating the piezoelectric sound-generating structure onto the extension portion of the display panel, the space occupied by the piezoelectric sound-generating structure on the display panel can be reduced, thereby reducing the size of the display device.

[0077] This application provides another method for manufacturing a display device; please refer to [link / reference]. Figure 13 , Figure 13This is a flowchart of another method for manufacturing a display device provided in this application embodiment, the method including:

[0078] Step 1301: Obtain a substrate, which includes a first region, a second region, and a third region.

[0079] Please refer to Figure 10 The first region of the substrate 1111 can be the region where the display portion A1 of the display panel 11 is located, the second region of the substrate 1111 can be the region where the bent portion A2 of the display panel 11 is located, and the third region of the substrate 1111 can be the region where the extension portion A3 of the display panel 11 is located. The substrate 1111 can be used to support other film layers in the display panel 11. The substrate 1111 can be a flexible substrate with bendable characteristics, which facilitates bending the third region to the outside of the second surface of the second region, thereby reducing the area of ​​the display panel 11 and enabling the display device 10 to achieve a narrow bezel effect. For example, the material of the substrate 1111 may include polyimide or other flexible materials.

[0080] Step 1302: A buffer layer, a channel layer, a gate insulating layer, a gate pattern, and an interlayer dielectric layer are sequentially formed on the substrate, and a first via is formed on the gate insulating layer and the interlayer dielectric layer.

[0081] The buffer layer, channel layer, gate insulating layer, gate pattern, and interlayer dielectric layer can be sequentially formed on the substrate. Please refer to [reference needed]. Figure 10 The gate pattern E2 may include a single-layer or multi-layer structure. For example, the gate pattern E2 may be a double-layer structure, comprising a first gate E21 and a second gate E22 sequentially disposed along a direction away from the substrate 1111. Correspondingly, the gate insulating layer may include a first gate insulating layer G2 located between the channel layer E1 and the first gate E21, and a second gate insulating layer G3 located between the first gate E21 and the second gate E22. A first via can be formed on the interlayer dielectric layer G4, the first gate insulating layer G2, and the second gate insulating layer G3 using a patterning process. The first via can be used to connect the source / drain pattern E3 to the channel layer E1. The patterning process involved in the embodiments of this application may include coating photoresist, exposure, development, etching, and photoresist stripping.

[0082] The buffer layer G1, the first gate insulating layer G2, and the second gate insulating layer G3 may include an opening K1. When the projected area of ​​the opening K1 on the substrate 1111 is small, the opening K1 can be formed after the second gate insulating layer G3 is formed, followed by the formation of the interlayer dielectric layer G4. Alternatively, the opening K1 can be formed after the screen sound-generating structure 12 is formed; this embodiment does not limit this. The opening K1 can provide a vibration cavity for the piezoelectric sound-generating structure, thereby avoiding the problem of poor sound emission of the display device due to insufficient vibration space of the piezoelectric sound-generating structure, and thus improving the sound emission effect of the display device.

[0083] Step 1303: Form source and drain patterns, a first electrode, and wires on the side of the interlayer dielectric layer away from the substrate.

[0084] Source and drain patterns, the first electrode, and conductive lines can be formed on the side of the interlayer dielectric layer away from the substrate. Please refer to [reference needed]. Figure 10 The source-drain pattern E3 can be located on the first region of the substrate 1111, and the first electrode F1 and the wire F4 can be located on the third region of the substrate 1111.

[0085] Step 1304: Form a piezoelectric layer on the side of the first electrode away from the substrate.

[0086] Please refer to Figure 10 The piezoelectric layer F2 can be formed on the side of the first electrode F1 away from the substrate 1111. The material of the piezoelectric layer F2 can include piezoelectric materials such as polyvinylidene fluoride, aluminum nitride, or lead zirconate titanate.

[0087] Step 1305: Form a planarization layer on the side of the source / drain pattern away from the substrate, and form a second via on the planarization layer.

[0088] Please refer to Figure 10 The planarization layer G5 can be formed on the side of the source-drain pattern E3 away from the substrate 1111, and a second via can be formed on the planarization layer G5 using a patterning process. The second via can be located in the first region and the third region. The second via located in the first region can be used to connect the anode pattern 1121 to the source-drain pattern E3, and the second via located in the third region can be used to connect the second electrode F3 to the wire F4.

[0089] Step 1306: Form an anode pattern on the side of the planarization layer away from the substrate, and form a second electrode on the side of the piezoelectric layer away from the substrate.

[0090] The anode pattern can be formed on the side of the planar layer away from the substrate, and the second electrode can be formed on the side of the piezoelectric layer away from the substrate. Please refer to [reference needed]. Figure 10 The anode pattern 1121 may be located on the first region of the substrate 1111, and the second electrode F3 may be located on the third region of the substrate 1111.

[0091] Step 1307: A pixel defining layer and a spacer are sequentially formed on the side of the planarization layer away from the substrate.

[0092] The pixel defining layer and spacers can be formed sequentially on the side of the planarization layer away from the substrate. Please refer to [reference needed]. Figure 10 The pixel defining layer 113 is located on the side of the planarization layer G5 away from the substrate 1111, and the pixel defining layer 113 can be used to divide multiple pixels. The spacer 114 is located on the side of the pixel defining layer 113 away from the substrate 1111, and the spacer 114 can prevent color mixing between adjacent pixels.

[0093] Step 1308: Form a light-emitting layer and a cathode pattern sequentially on the side of the anode pattern away from the substrate to form a light-emitting functional layer.

[0094] The light-emitting layer and cathode pattern can be formed sequentially on the side of the anode pattern away from the substrate. Please refer to [reference needed]. Figure 10 The anode pattern 1121 includes multiple anodes, and the cathode pattern 1123 includes multiple cathodes. The anodes and cathodes work together to drive the light-emitting layer 1122 to emit light.

[0095] Step 1309: Bend the second region of the substrate.

[0096] Please refer to Figure 3 and Figure 10 By bending the second region of the substrate 1111, the extension A3 of the formed display panel 11 can be located outside the second surface A12 of the display section A1, thereby reducing the area of ​​the display panel 11 and enabling the display device 10 to achieve a narrow bezel effect.

[0097] In summary, this application provides a method for manufacturing a display device including a display panel and at least one piezoelectric sound-generating structure. The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion, with the extension portion bent to the back side of the display portion. The piezoelectric sound-generating structure is located on the extension portion of the display panel. Driven by an electrical signal, the piezoelectric sound-generating structure vibrates, causing the display panel to vibrate. This allows the piezoelectric sound-generating structure to convert audio electrical signals into sound wave signals, thereby enabling the display device to generate sound. By integrating the piezoelectric sound-generating structure onto the extension portion of the display panel, the space occupied by the piezoelectric sound-generating structure on the display panel can be reduced, thereby reducing the size of the display device.

[0098] This application provides another method for manufacturing a display device; please refer to [link / reference]. Figure 14 , Figure 14 This is a flowchart of another method for manufacturing a display device provided in this application embodiment, the method including:

[0099] Step 1401: Obtain the display panel.

[0100] The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display part, a bent part and an extension part. The light-emitting functional layer is located on the first surface of the display part. The bent part is connected to the display part and the extension part respectively. The second surface is the opposite surface to the first surface.

[0101] Step 1402: Form a lead wire at a preset position on the display panel.

[0102] The leads can be formed at preset positions on the extension of the display panel. Please refer to [reference needed]. Figure 11 One end of the lead F6 is electrically connected to the driver chip F5, and the preset position can be the location where at least one piezoelectric sound-generating structure 12 is to be formed. For example, the material of the lead F6 may include conductive silver paste. In this embodiment of the application, the lead F6 can be formed by applying conductive silver paste to a preset position on the extension of the display panel.

[0103] Step 1403: Bend the bent portion so that the extension is located outside the second surface of the display portion.

[0104] Step 1404: Form at least one piezoelectric sound-generating structure at a preset position on the display panel.

[0105] In summary, this application provides a method for manufacturing a display device including a display panel and at least one piezoelectric sound-generating structure. The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion, with the extension portion bent to the back side of the display portion. The piezoelectric sound-generating structure is located on the extension portion of the display panel. Driven by an electrical signal, the piezoelectric sound-generating structure vibrates, causing the display panel to vibrate. This allows the piezoelectric sound-generating structure to convert audio electrical signals into sound wave signals, thereby enabling the display device to generate sound. By integrating the piezoelectric sound-generating structure onto the extension portion of the display panel, the space occupied by the piezoelectric sound-generating structure on the display panel can be reduced, thereby reducing the size of the display device.

[0106] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0107] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0108] In this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0109] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display device, characterized in that, The display device includes: The display panel includes a substrate and a light-emitting functional layer. The substrate includes a display portion, a bent portion, and an extension portion. The light-emitting functional layer is located on a first surface of the display portion. The extension portion is bent to the outside of a second surface of the display portion. The bent portion is connected to the display portion and the extension portion respectively. The second surface is the opposite surface to the first surface. At least one piezoelectric sound-generating structure, said at least one piezoelectric sound-generating structure being located on the extension; The substrate includes a substrate and a circuit structure located on the substrate; the circuit structure includes a gate pattern and a source / drain pattern, and the light-emitting functional layer includes an anode pattern, a light-emitting layer, and a cathode pattern. The piezoelectric sound-generating structure includes a wire, a driver chip, a first electrode, a piezoelectric layer, and a second electrode stacked sequentially along a direction away from the extension portion. The first electrode and the second electrode are electrically connected to the driver chip through the wire. The first electrode and the gate pattern or the source-drain pattern are in the same layer, the second electrode and the anode pattern are in the same layer, and the wire and the gate pattern or the source-drain pattern are in the same layer. The substrate has at least one opening corresponding to the at least one piezoelectric sound-generating structure, and the orthographic projection of the piezoelectric sound-generating structure on the substrate overlaps with the orthographic projection of the corresponding opening on the substrate.

2. The display device according to claim 1, characterized in that, The substrate includes an insulating layer, the piezoelectric sound-generating structure is located on the insulating layer, the opening is a blind opening, and the bottom of the opening is the insulating layer.

3. The display device according to claim 1, characterized in that, The at least one piezoelectric sound-generating structure includes a first piezoelectric sound-generating structure, which is located on the side of the extension away from the display portion.

4. The display device according to claim 3, characterized in that, The number of the piezoelectric sound-generating structures is at least two, and the display device further includes a second piezoelectric sound-generating structure located on the extension. The frequency response range of the first piezoelectric sound-generating structure is different from that of the second piezoelectric sound-generating structure.

5. The display device according to claim 4, characterized in that, The second piezoelectric sound-generating structure is located on the side of the extension near the display portion.

6. The display device according to claim 1, characterized in that, The piezoelectric sound-generating structure includes a driver chip, a first electrode, a piezoelectric layer, and a second electrode that are sequentially stacked along a direction away from the extension. The display device further includes leads, one end of which is electrically connected to the first electrode or the second electrode, and the other end of which is electrically connected to the driver chip. The leads include conductive silver paste.

7. The display device according to claim 1, characterized in that, The number of the piezoelectric sound-generating structures is at least two, and the at least two piezoelectric sound-generating structures are stacked on the extension.

8. A method for manufacturing a display device, characterized in that, The method includes: A display panel is obtained, the display panel including a substrate and a light-emitting functional layer, the substrate including a display part, a bent part and an extension part, the light-emitting functional layer being located on a first surface of the display part, the extension part being bent to the outside of a second surface of the display part, the bent part being connected to the display part and the extension part respectively, and the second surface being the other surface opposite to the first surface; At least one piezoelectric sound-generating structure is formed on the display panel, and the at least one piezoelectric sound-generating structure is located on the extension portion; the substrate includes a substrate and a circuit structure located on the substrate; the circuit structure includes a gate pattern and a source / drain pattern, and the light-emitting functional layer includes an anode pattern, a light-emitting layer, and a cathode pattern; the piezoelectric sound-generating structure includes a wire, a driving chip, a first electrode, a piezoelectric layer, and a second electrode sequentially stacked along a direction away from the extension portion, the first electrode and the second electrode being electrically connected to the driving chip through the wire; the first electrode and the gate pattern or the source / drain pattern are in the same layer, the second electrode and the anode pattern are in the same layer, and the wire and the gate pattern or the source / drain pattern are in the same layer; the substrate has at least one opening corresponding to the at least one piezoelectric sound-generating structure, and the orthographic projection of the piezoelectric sound-generating structure on the substrate overlaps with the orthographic projection of the corresponding opening on the substrate.

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