Touch display panel, preparation method thereof and display device

Abstract

The application provides a touch display panel and a preparation method thereof and a display device. The touch display panel comprises a substrate, a display function layer arranged on one side of the substrate, the display function layer comprising a plurality of light emitting units, an encapsulation layer arranged on a side of the display function layer away from the substrate, a normal projection of the light emitting unit on the substrate being located in a normal projection of the encapsulation layer on the substrate, a metal shielding layer arranged on a side of the encapsulation layer away from the substrate, the metal shielding layer being grounded, an organic layer arranged on a side of the metal shielding layer away from the substrate, a touch layer arranged on a side of the organic layer away from the substrate, the touch layer comprising a touch electrode, a coupling capacitor being formed between the metal shielding layer and the touch layer, and the organic layer serving as a capacitor dielectric of the coupling capacitor. The touch display panel forms a coupling capacitor between the metal shielding layer and the touch layer, and uses the organic layer as a capacitor dielectric, so that the touch load can be regulated and controlled, and the display coupling ripple can be effectively reduced and the touch power consumption can be reduced by grounding the metal shielding layer.

Description

Technical Field

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

[0002] Organic light-emitting diodes (OLEDs) and flat panel displays based on light-emitting diodes (LEDs) are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body, and wide range of applications, becoming the mainstream of display devices.

[0003] In related technologies, the touch layer is integrated into the display panel through Touch On Encapsulated Layer (TOE) technology. The touch layer is located on the side of the encapsulation layer of the display panel closer to the light-emitting surface, which enables the display panel to have touch functionality.

[0004] However, current display panels with integrated touch layers have poor touch performance. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a touch display panel and its manufacturing method and display device, which can reduce display coupling ripple, reduce touch power consumption and improve touch performance.

[0006] To achieve the above objectives, an embodiment of the first aspect of this application provides a touch display panel, comprising:

[0007] Substrate;

[0008] The display functional layer is disposed on one side of the substrate and includes a plurality of light-emitting units;

[0009] An encapsulation layer is disposed on the side of the display functional layer away from the substrate, and the orthographic projection of the light-emitting unit on the substrate is located within the orthographic projection of the encapsulation layer on the substrate;

[0010] A metal shielding layer is disposed on the side of the encapsulation layer away from the substrate, and the metal shielding layer is grounded;

[0011] An organic layer is disposed on the side of the metal shielding layer away from the substrate;

[0012] A touch layer is disposed on the side of the organic layer away from the substrate, and the touch layer includes touch electrodes;

[0013] Wherein, the orthographic projection of the metal shielding layer on the substrate at least partially overlaps with the orthographic projection of the touch layer on the substrate, and a coupling capacitor is formed between the metal shielding layer and the touch layer; the orthographic projection of the organic layer on the substrate at least partially overlaps with the orthographic projection of the touch layer on the substrate, and the organic layer serves as the capacitor medium of the coupling capacitor.

[0014] Optionally, the size of the touch display panel ranges from 10 inches to 20 inches.

[0015] Optionally, the material of the metal shielding layer includes a transparent metal.

[0016] Optionally, the metal shielding layer includes a mesh structure, and the material of the mesh structure includes a non-transparent metal.

[0017] Optionally, the touch display panel further includes a driving circuit layer, which includes a plurality of pixel driving circuits. The display function layer is located on the side of the driving circuit layer away from the substrate, and the pixel driving circuit is connected to the corresponding light-emitting unit.

[0018] Optionally, the light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked along a direction away from the substrate.

[0019] Optionally, the encapsulation layer includes a first encapsulation sublayer, a second encapsulation sublayer, and a third encapsulation sublayer stacked sequentially along a direction away from the substrate. The first encapsulation sublayer includes an inorganic material, the second encapsulation sublayer includes an organic material, and the third encapsulation sublayer includes an inorganic material.

[0020] Optionally, the touch layer further includes a touch protection layer, which is located on the side of the touch electrode away from the substrate, and the orthographic projection of the touch electrode on the substrate is located within the orthographic projection of the touch protection layer on the substrate.

[0021] A second aspect of this application provides a method for manufacturing a touch display panel, the method comprising:

[0022] Provide a substrate;

[0023] A display functional layer is formed on one side of the substrate and patterned, and multiple light-emitting units are formed in the display functional layer;

[0024] An encapsulation layer is disposed on the side of the display functional layer away from the substrate, such that the encapsulation layer covers the light-emitting unit;

[0025] A metal shielding layer is provided and patterned on the side of the encapsulation layer away from the substrate, and the metal shielding layer is grounded;

[0026] An organic layer is disposed on the side of the metal shielding layer away from the substrate;

[0027] A touch layer is disposed on the side of the organic layer away from the substrate, so that a coupling capacitor is formed between the touch layer and the metal shielding layer, and the organic layer serves as the capacitor medium of the coupling capacitor.

[0028] An embodiment of the third aspect of this application provides a display device including a touch display panel of any of the above embodiments.

[0029] The touch display panel provided in this application sequentially comprises a display device layer, an encapsulation layer, a grounded metal shielding layer, an organic layer, and a touch layer on a substrate. The overlapping area of ​​the metal shielding layer and the touch layer forms a coupling capacitor, and the organic layer serves as the capacitor medium. This allows for the regulation of the touch load. At the same time, the grounding of the metal shielding layer effectively reduces display coupling ripple, lowers touch power consumption, reduces interference from array signals to touch signals, and improves touch performance. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the film structure of a related touch display panel;

[0032] Figure 2 A schematic diagram of the film layer structure of a touch display panel provided in an embodiment of this application;

[0033] Figure 3 A schematic diagram of the film layer structure of a touch display panel provided in another embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the encapsulation layer in a touch display panel provided in an embodiment of this application;

[0035] Figure 5 This is a schematic flowchart illustrating a method for manufacturing a touch display panel according to an embodiment of this application.

[0036] Marker explanation:

[0037] 100. Touch display panel; 1. Substrate; 11. Driving circuit layer; 2. Display function layer; 20. Light-emitting unit; 21. First electrode; 22. Light-emitting function layer; 23. Second electrode; 3. Encapsulation layer; 31. First encapsulation sub-layer; 32. Second encapsulation sub-layer; 33. Third encapsulation sub-layer; 4. Touch layer; 41. Touch electrode; 42. Touch protection layer; 5. Metal shielding layer; 6. Organic layer. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. It is understood that when a structure is referred to as being "on" or "below" another structure, the structure may be directly on or below the other structure, or there may be intermediate structures. The same reference numerals always indicate the same structure. Structures referred to herein include any of the following: membrane, element, device, component, assembly.

[0041] When a structure is referred to as being “connected” to another structure, it can be directly connected to the other structure or indirectly connected to the other structure by means of one or more intermediate structures placed between them.

[0042] With the development of flexible display technology, OLED has demonstrated its enormous potential in flexible displays. From fixed flexible displays to foldable and rollable displays, the performance requirements for touch panels (TPs) in handheld devices are becoming increasingly stringent. OLED has evolved from external TPs to on-screen touch structures, integrating the TP with the display and optimizing the consistency of display and touch effects between the display and the TP. However, traditional mid-sized OLED devices mostly use external TP structures, requiring additional film layer stacking, resulting in complex processes and high costs.

[0043] Figure 1 This is a schematic diagram of the film layer structure of a related touch display panel. For example... Figure 1 As shown, in related technologies, a touch display panel 100 includes a substrate 1, a display functional layer 2, an encapsulation layer 3, and a touch layer 4 stacked sequentially. The inventors of this application have discovered that this touch display panel 100 uses a conventional on-screen touch structure. The touch layer 4 is too close to the cathode of the light-emitting unit within the display functional layer 2, resulting in a large coupling capacitance between the touch layer 4 and the display array. This affects touch loading (TPloading), leading to low signal transmission efficiency, high power consumption, and susceptibility to electromagnetic interference, resulting in insufficient signal-to-noise ratio (SNR). The root cause of this problem lies in the direct capacitive coupling effect between the touch layer 4 and the cathode of the light-emitting unit, which causes signal crosstalk. Furthermore, after encapsulation, it is difficult to flexibly adjust the dielectric parameters of the coupling capacitance through the encapsulation layer 3.

[0044] Based on this, this application provides a solution for a touch display panel to address the aforementioned problems. By adding a metal shielding layer to the encapsulation layer, and grounding the metal shielding layer, the coupling capacitor can absorb external electromagnetic interference, reduce signal noise, and improve the signal-to-noise ratio. An organic layer is placed above the metal shielding layer as the capacitor medium between the touch layer and the metal shielding layer, which expands the application to medium-sized display devices, allows the TP loading level to reach the same level as external solutions, and simultaneously simplifies the process and offers significant cost advantages.

[0045] The touch display panel 100 of this application may include an OLED display panel, a quantum dot light-emitting diode (QLED) display panel, etc. OLED display panels have advantages such as small size, portability, flexibility, and narrow bezels, and are increasingly used in high-performance display fields. The following embodiments of this application are all explained using the touch display panel 100 including an OLED display panel as an example. Based on this, when the substrate in the OLED display panel is made of a flexible substrate material, the OLED display panel can be a flexible display panel. The following embodiments of this application are all explained using the OLED display panel as a flexible display panel as an example. It should be noted that the aforementioned flexible substrate material may include one or more of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or polyimide (PI), etc., and the embodiments of this application do not limit this.

[0046] Figure 2 This is a schematic diagram of the film layer structure of a touch display panel according to an embodiment of this application. Figure 2 As shown, an embodiment of the first aspect of this application provides a touch display panel 100, which includes a substrate 1, a display functional layer 2, an encapsulation layer 3, a metal shielding layer 5, an organic layer 6, and a touch layer 4.

[0047] The display functional layer 2 is disposed on one side of the substrate 1 and includes multiple light-emitting units 20. The display functional layer 2 has a light-emitting surface. An encapsulation layer 3 is disposed on the side of the display functional layer 2 away from the substrate 1, and the orthographic projection of the light-emitting units 20 onto the substrate 1 lies within the orthographic projection of the encapsulation layer 3 onto the substrate 1. The encapsulation layer 3 covers the light-emitting units 20. A metal shielding layer 5 is disposed on the side of the encapsulation layer 3 away from the substrate 1 and is grounded. An organic layer 6 is disposed on the side of the metal shielding layer 5 away from the substrate 1. A touch layer 4 is disposed on the side of the organic layer 6 away from the substrate 1 and includes touch electrodes 41. The touch layer 4 is used to implement the touch function of the touch display panel 100.

[0048] In this configuration, the orthographic projection of the metal shielding layer 5 onto the substrate 1 at least partially overlaps with the orthographic projection of the touch layer 4 onto the substrate 1, forming a coupling capacitor between the metal shielding layer 5 and the touch layer 4. Similarly, the orthographic projection of the organic layer 6 onto the substrate 1 at least partially overlaps with the orthographic projection of the touch layer 4 onto the substrate 1, with the organic layer 6 serving as the dielectric of the coupling capacitor. "At least partially overlapping orthographic projections onto the substrate 1" refers to the overlapping portions of the projection ranges of different film layers along the thickness direction.

[0049] For example, substrate 1 is made of glass or flexible polyimide (PI) substrate with a thickness of 0.1-0.5 mm. Display functional layer 2 includes multiple OLED light-emitting units 20, each light-emitting unit 20 including a first electrode (anode, such as ITO), a light-emitting functional layer (organic material), and a second electrode (cathode, such as aluminum / silver alloy), formed by a vapor deposition process. Encapsulation layer 3 can adopt an inorganic / organic composite structure, for example, the first layer is SiNx (thickness 50-100 nm), the second layer is polyimide (PI, thickness 1-3 μm), and the third layer is Al2O3 (thickness 50-100 nm), achieving high barrier properties and mechanical flexibility. Metal shielding layer 5 is formed by depositing transparent metal (such as ITO) or a mesh-like non-transparent metal (such as copper) on encapsulation layer 3 using a sputtering process. Grounding can be achieved by connecting to a common ground terminal via a metal wire, or by grounding to the touch ground signal via conductive adhesive. The organic layer 6, made of polyimide or epoxy resin, has a thickness of 0.5-5 μm and a dielectric constant of 2.5-4.0, serving as the capacitor medium between the touch layer 4 and the shielding layer 5. ITO or a metal mesh touch electrode can be formed using photolithography, and then an optical adhesive protective layer is applied to form the touch layer 4.

[0050] When the metal shielding layer 5 is grounded, it can be connected to either the touch ground signal or the display ground signal to achieve optimized electromagnetic shielding and interference suppression through sharing the system ground potential. The touch ground signal serves as the reference potential for the touch layer 4. Connecting it allows the metal shielding layer 5 and the touch layer 4 to form an equipotential environment, effectively reducing electromagnetic coupling interference during touch signal transmission and improving the signal-to-noise ratio of the touch signal. The display ground signal, on the other hand, is the ground reference for the display functional layer. Connecting it allows electromagnetic noise generated by the display circuitry to be conducted to the ground through the metal shielding layer, reducing the coupling ripple of the display array signal to the touch layer. Both grounding methods are based on the common ground principle, making the metal shielding layer a low-impedance noise discharge path between the display functional layer and the touch layer. This not only blocks the transmission of noise from the display end to the touch end but also provides a stable potential reference for the touch signal, thus balancing the anti-interference requirements of both display and touch functions and ensuring their collaborative performance on the same substrate.

[0051] The touch display panel 100 provided in this embodiment reduces the coupling ripple between the touch panel (TP) and the array signal by adding a metal shielding layer 5 to the conventional on-screen touch structure, thereby reducing TP power consumption and improving TP performance. Furthermore, after the metal shielding layer 5 is grounded, the display coupling ripple is significantly reduced, theoretically lowering the interference of tens of mV in conventional designs to 0 mV, greatly reducing TP power consumption. The organic layer 6, as the main capacitor medium between the TP and the metal shielding layer 5, allows for flexible adjustment of the TP loading size. Since the encapsulation of the light-emitting unit 20 is already complete, the thickness of the organic layer 6 is not limited. By adjusting the thickness and material properties of the organic layer 6, the TP loading of the on-screen touch structure can reach a level comparable to or even better than that of external solutions, improving TP performance. Simultaneously, by integrating touch and display, the consistency of display and touch effects between the display and TP is optimized, expanding the application of on-screen touch structures in the medium-sized field and breaking the dilemma of complex processes and high costs caused by the use of external TPs due to TP performance issues in the medium-sized field. It effectively solves the problems of excessive touch load, large interference with the array, and low signal-to-noise ratio in the current on-screen touch structure.

[0052] It should be noted that a coupling capacitor is a component in a circuit used to transmit AC signals and block DC signals. It consists of two conductors and an intermediate dielectric. Its core function is to allow signals of a specific frequency to pass through while isolating unwanted DC components, ensuring that the DC operating points of each stage of the circuit are independent. In the embodiments of this application, the capacitor formed between the metal shielding layer 5 and the touch layer 4 is called a coupling capacitor. The touch electrodes can transmit signals to the shielding layer or the receiving end through capacitive coupling. After the metal shielding layer 5 is grounded, the coupling capacitor can absorb external electromagnetic interference, reduce signal noise, and improve the signal-to-noise ratio (SNR).

[0053] The capacitance value (C) affects the touch load, and the formula for calculating the capacitance value is C = εA / d. Here, ε is the dielectric constant of the organic layer 6, A is the electrode area of ​​the overlapping region, and d is the thickness of the organic layer 6. By adjusting the thickness or material of the organic layer 6, touch sensitivity and power consumption can be optimized. Specifically, the smaller the thickness of the organic layer 6, the larger the capacitance value and the increased touch load, but a balance must be struck between process difficulty and performance. Different dielectric materials can be selected for the organic layer 6; high-dielectric materials (such as polyimide) can increase capacitance and enhance signal coupling efficiency. The capacitance value is precisely controlled by adjusting the overlapping area of ​​the touch layer 4 and the metal shielding layer 5 through graphical design. By adjusting the capacitance value, the touch load of the on-screen touch structure is made consistent with that of the external solution, solving the performance degradation problem caused by the complex structure of medium-sized devices. An excessively large capacitance value increases power consumption, while an excessively small capacitance value reduces signal sensitivity. In this embodiment, the metal shielding layer 5 is grounded to reduce interference ripple to 0mV, and the capacitance value is rationally designed to achieve a balance between low power consumption and high signal-to-noise ratio. Therefore, in the field of touch display, coupling capacitance is a key parameter connecting touch functionality and display performance, and its design directly affects the device's sensitivity, power consumption, and anti-interference capability. Through structural optimization (such as a combination of a metal shielding layer and an organic layer), performance breakthroughs can be achieved in mid-sized TOE devices.

[0054] In one embodiment, the metal shielding layer 5 is made of transparent metal. This reduces electromagnetic interference and light transmittance loss while maintaining display quality, making it suitable for devices with high light transmittance requirements (such as transparent displays).

[0055] In another embodiment, the metal shielding layer 5 includes a mesh structure made of a non-transparent metal. This improves shielding efficiency and reduces touch signal attenuation by optimizing linewidth and aperture ratio.

[0056] For example, the metal shielding layer 5 is a transparent metal shielding layer, and common transparent conductive metal materials such as indium tin oxide (ITO) and indium zinc oxide (IZO) can be selected. When preparing the metal shielding layer 5, a sputtering process can be used. A target containing the target transparent metal material is installed in a sputtering device, and a uniform transparent metal film is deposited on the encapsulation layer 3 by controlling parameters such as sputtering power, sputtering time, and working gas flow rate. After deposition, the film is patterned using photolithography and etching processes to conform to the design requirements in shape and size, while ensuring good grounding of the metal shielding layer 5. Using transparent metal as the material for the metal shielding layer 5 achieves the shielding function while ensuring high transmittance of the display panel, without affecting the display effect. Compared to non-transparent metal shielding layers, transparent metal does not block light from the display area, making the display image clearer, brighter, and with higher color fidelity.

[0057] Alternatively, for example, the metal shielding layer 5 can be a mesh-like non-transparent metal shielding layer. While achieving the shielding function, it can ensure high transmittance of the display panel without affecting the display effect. If the metal shielding layer 5 adopts a mesh structure and the material is a non-transparent metal, copper, aluminum, or other metal materials can be selected. First, a photoresist mask with a mesh pattern is fabricated on the encapsulation layer 3 using photolithography. Then, using methods such as electroplating or physical vapor deposition, non-transparent metal is deposited in the patterned area of ​​the photoresist mask to form the mesh-like metal shielding layer 5. After deposition, the photoresist mask is removed, and the metal shielding layer 5 is patterned and grounded. When designing the mesh structure, for example, the aperture can be controlled within 5-50 μm, and the metal linewidth can be controlled within 2-20 μm. The mesh-like non-transparent metal shielding layer 5 has unique advantages. On the one hand, the mesh structure can reduce the amount of metal material used while ensuring a certain shielding effect, thus reducing costs. On the other hand, compared to a full-surface non-transparent metal shielding layer, the mesh structure blocks less display light, mitigating the impact on the display effect to a certain extent. Moreover, this structure exhibits excellent electromagnetic shielding performance, effectively blocking interference from array signals to the TP signal, improving the signal-to-noise ratio, and further optimizing TP performance. Furthermore, by rationally designing the parameters of the mesh structure, a good balance can be found between cost, shielding effectiveness, and display performance, meeting the needs of different application scenarios.

[0058] In some embodiments, the size of the touch display panel 100 ranges from 10 inches to 20 inches. For example, the size of the touch display panel 100 is 10 inches, 12 inches, 15 inches, 17 inches, or 20 inches.

[0059] It should be noted that the size of the touch display panel 100 refers to the length of its display area diagonally, in inches (1 inch ≈ 2.54 centimeters). For example, 15 inches means that the physical length of the screen diagonal is 15 inches. This parameter directly affects the display area and applicable scenarios of the device. A larger size can provide a wider field of view, but a balance must be struck between resolution, power consumption, and portability.

[0060] The touch display panel 100 is limited to a size of 10-20 inches, suitable for mid-sized devices such as tablets and automotive displays. Within this size range, traditional on-screen touch structures have numerous problems, while the solution proposed in this application is well-suited. On one hand, through specific layered structures and technical means, it solves the problem of insufficient TP performance in mid-sized devices, making the product competitive in the mid-sized market. On the other hand, it helps manufacturers optimize production processes and supply chains according to this size range, improving production efficiency, reducing production costs, promoting the industrialization of mid-sized TOE products, and meeting the demand for high-performance touch display panels in mid-sized display devices such as tablets and automotive displays.

[0061] For example, substrate 1 can be a flexible PI substrate for foldable devices. Alternatively, a rigid glass substrate can be used for fixed devices. Touch electrode 41 can employ a metal mesh (silver nanowires, 20 μm linewidth) to reduce the resistivity of large-size panels and ensure touch signal uniformity. The combined structure of metal shielding layer 5 and organic layer 6 can be extended to 20 inches, avoiding the uncontrolled TP loading caused by the increased area of ​​traditional TOE. The mesh-like metal shielding layer 5 (85% aperture ratio) can balance light transmittance and shielding effect, achieving a touch response delay of <10ms, meeting the high-performance requirements of medium-sized devices.

[0062] Figure 3 This is a schematic diagram of the film layer structure of a touch display panel provided for another embodiment of this application. (See diagram below.) Figure 3 As shown, in some embodiments, the touch display panel 100 further includes a driving circuit layer 11, which includes a plurality of pixel driving circuits. The display function layer 2 is located on the side of the driving circuit layer 11 away from the substrate 1, and the pixel driving circuit is connected to the corresponding light-emitting unit 20 for driving the light-emitting unit 20 to emit light for display.

[0063] For example, the driving circuit layer 11 may include multiple pixel driving circuits located in the display area, and the display function layer 2 is located on the driving circuit layer 11. For example, the pixel driving circuit may include multiple transistors (TFTs), capacitors, etc., and may be formed in various forms such as 2T1C (i.e., 2 transistors (TFTs) and 1 capacitor (C)), 3T1C, or 7T1C. The pixel driving circuit is connected to the light-emitting unit 20 to control the switching state and brightness of the light-emitting unit 20.

[0064] Specifically, in fabricating the touch display panel 100, a driving circuit layer 11 is fabricated on the substrate 1 using semiconductor manufacturing processes. Multiple pixel driving circuits in the driving circuit layer 11 are formed through processes such as photolithography, etching, and doping to ensure that each pixel driving circuit can be connected to its corresponding light-emitting unit 20. The connection can be made electrically via metal wires, and the reliability and stability of the connection must be ensured during fabrication. After the driving circuit layer 11 is fabricated, the display function layer 2, encapsulation layer 3, metal shielding layer 5, organic layer 6, and touch layer 4 are fabricated sequentially.

[0065] By using the driving circuit layer 11 and cooperating with the display function layer 2, the light-emitting state of each light-emitting unit 20 can be controlled, improving the quality and stability of the displayed image. The pixel driving circuit in the driving circuit layer 11 can accurately adjust parameters such as brightness and color of the light-emitting unit 20 according to the input image signal, achieving a high-resolution, high-contrast display effect. Simultaneously, this structural design helps improve the response speed of the display panel and enhances the user's visual experience.

[0066] In some embodiments, the light-emitting unit 20 includes a first electrode 21, a light-emitting functional layer 22, and a second electrode 23 sequentially stacked along a direction away from the substrate 1.

[0067] Specifically, the light-emitting unit 20 includes a first electrode 21, a light-emitting functional layer 22, and a second electrode 23 sequentially stacked on the driving circuit layer 11. The first electrode 21 is the anode, and the second electrode 23 is the cathode. For example, the light-emitting functional layer 22 may include a light-emitting layer, and may further include one or more of the following: a hole injection layer, a hole transport layer, an organic light-emitting functional layer, an electron transport layer, and an electron injection layer; and may even further include one or more of the following: a hole blocking layer and an electron blocking layer.

[0068] Figure 4 This is a schematic diagram of the encapsulation layer in a touch display panel provided as an embodiment of this application. Figure 4 As shown, in some embodiments, the encapsulation layer 3 includes a first encapsulation sublayer 31, a second encapsulation sublayer 32 and a third encapsulation sublayer 33 sequentially stacked along a direction away from the substrate 1. The first encapsulation sublayer 31 includes inorganic materials, the second encapsulation sublayer 32 includes organic materials, and the third encapsulation sublayer 33 includes inorganic materials.

[0069] The encapsulation layer 3 is located on the side of the display functional layer 2 away from the substrate 1 to prevent water and oxygen intrusion and protect the display functional layer 2. The encapsulation layer 3 may include stacked inorganic and organic materials. Compared with organic materials, the inorganic material layer has a better ability to block water and oxygen; compared with inorganic materials, organic materials have better flexibility and better film-forming properties. By encapsulating the display functional layer 2 together with organic and inorganic materials, the overall ability of the touch display panel 100 to resist water and oxygen is improved.

[0070] like Figure 3 As shown, in some embodiments, the touch layer 4 further includes a touch protection layer 42, which is located on the side of the touch electrode 41 away from the substrate 1, and the orthogonal projection of the touch electrode 41 on the substrate 1 is located within the orthogonal projection of the touch protection layer 42 on the substrate 1.

[0071] Specifically, the touch layer 4 enables the touch display panel 100 to be touched. The touch layer 4 can be disposed on the light-emitting side of the display function layer 2. In order to avoid the touch layer 4 from affecting the display of the display function layer 2, the touch layer 4 can be made of a transparent conductive material.

[0072] The touch layer 4 may include a plurality of touch electrodes 41 spaced apart. Adjacent touch electrodes 41 cooperate to form a touch capacitor. By analyzing the electrical signal of the change in touch capacitor, the user's touch position on the touch display panel 100 can be determined.

[0073] The touch electrode 41 can be a self-capacitive touch electrode, forming a self-capacitance. Of course, the touch electrode 41 can also be a mutual-capacitive touch electrode, such as a touch driving electrode or a touch sensing electrode.

[0074] For example, when fabricating the touch layer 4, multiple touch electrodes 41 are first fabricated on the organic layer 6 using processes such as photolithography and etching. The touch electrodes 41 can be made of metal or transparent conductive materials. During the fabrication process, the pattern and size of the touch electrodes 41 are controlled to meet the requirements of touch sensitivity. After the touch electrodes 41 are fabricated, a touch protective layer 42 is set on the side away from the substrate 1. The touch protective layer 42 can be made of transparent organic materials, such as acrylic resin. When setting the touch protective layer 42, it is ensured that it covers the touch electrodes 41 to prevent the touch electrodes 41 from being exposed and damaged. The touch electrodes 41 are responsible for sensing touch signals, enabling the device to respond to touch operations quickly and accurately. The touch protective layer 42 protects the touch electrodes 41 from scratches, corrosion, and other damage, extending the service life of the touch layer 4. At the same time, the transparent touch protective layer 42 does not affect the display effect, ensuring the clarity of the displayed image. In addition, the touch protective layer 42 can also improve the touch feel and enhance the user experience.

[0075] Figure 5 This is a schematic flowchart illustrating a method for manufacturing a touch display panel according to an embodiment of this application. Figure 5 As shown, an embodiment of the second aspect of this application also provides a method for manufacturing a touch display panel 100, the method comprising the following steps:

[0076] Step S1: Provide a substrate 1;

[0077] Step S2: A display functional layer 2 is formed on one side of the substrate 1 and patterned, forming multiple light-emitting units 20 on the display functional layer 2;

[0078] Step S3: Deposit an encapsulation layer 3 on the side of the display functional layer 2 away from the substrate 1, so that the encapsulation layer 3 covers the light-emitting unit 20;

[0079] Step S4: A metal shielding layer 5 is formed on the side of the encapsulation layer 3 away from the substrate 1 and patterned, and the metal shielding layer 5 is grounded;

[0080] Step S5: An organic layer 6 is disposed on the side of the metal shielding layer 5 away from the substrate 1;

[0081] Step S6: A touch layer 4 is disposed on the side of the organic layer 6 away from the substrate 1, so that a coupling capacitor is formed between the touch layer 4 and the metal shielding layer 5, and the organic layer 6 serves as the capacitor medium of the coupling capacitor.

[0082] Specifically, in fabricating the touch display panel 100, the first step is to select a suitable substrate 1, such as a glass substrate or a flexible plastic substrate, and clean and pre-treat it to improve surface flatness and cleanliness. The second step is to fabricate a display functional layer 2 on one side of the substrate 1 using photolithography, evaporation, or other processes. Multiple light-emitting units 20 are formed on the display functional layer 2 by controlling the photolithography mask and process parameters. The third step is to deposit the sub-layers of the encapsulation layer 3 sequentially on the side of the display functional layer 2 away from the substrate 1 using chemical vapor deposition, coating, or other methods, ensuring that the encapsulation layer 3 completely covers the light-emitting units 20 and provides good protection. The fourth step is to set a metal shielding layer 5 on the side of the encapsulation layer 3 away from the substrate 1 using sputtering, evaporation, or other techniques, followed by patterning, and then grounding the metal shielding layer 5. Grounding can be achieved by connecting a metal wire to a common ground terminal. The fifth step is to set an organic layer 6 above the metal shielding layer 5 using coating, printing, or other methods, adjusting the thickness of the organic layer 6 according to the required TP loading. The sixth step involves fabricating a touch layer 4 on the side of the organic layer 6 away from the substrate 1 using photolithography, etching, and other processes. This creates a coupling capacitor between the touch layer 4 and the metal shielding layer 5, with the organic layer 6 serving as the capacitor dielectric.

[0083] The metal shielding layer 5 is patterned to form a coupling capacitor with the touch layer 4 and to regulate the touch load; at the same time, it can be formed into a specific structure (such as a mesh) according to design requirements, so as to achieve electromagnetic shielding while taking into account the light transmittance of the display or material optimization.

[0084] The method for fabricating the touch display panel 100 provided in this application embodiment allows connection to the touch ground signal or display ground signal via a grounded metal shielding layer 5. This reduces display coupling ripple; current conventional designs exhibit interference of tens of mV, which can theoretically be reduced to 0 mV after adding the shielding layer, thus reducing TP power consumption. An organic layer is placed above the metal shielding layer. Since encapsulation is already complete, the thickness of the organic layer is less restricted and can be changed according to specific circumstances. This organic layer serves as the main capacitor dielectric between the TP and the metal shielding layer, allowing for adjustment of the TP loading level to achieve a loading level comparable to or even better than that of an external loading solution.

[0085] An embodiment of the third aspect of this application also provides a display device, which includes the touch display panel 100 of any of the above embodiments. Since the display device provided by the embodiment of the third aspect of this application includes the touch display panel 100 of any of the first aspects, the display device provided by the embodiment of the third aspect of this application has the beneficial effects of the touch display panel 100 of any of the first aspects.

[0086] Specifically, the display device provided in this application embodiment, by sequentially setting a display function layer, an encapsulation layer, a grounded metal shielding layer, an organic layer and a touch layer on a substrate, utilizes the overlapping area of ​​the orthographic projection of the metal shielding layer and the touch layer to form a coupling capacitor, and uses the organic layer as the capacitor medium, can adjust the touch load to a level comparable to an external solution. At the same time, by grounding the metal shielding layer, the display coupling ripple is effectively reduced, the touch power consumption is reduced, the interference of the array signal on the touch signal is reduced, and the signal-to-noise ratio is improved.

[0087] Furthermore, the touch display panel 100 is suitable for medium-sized scenarios of 10-20 inches. By optimizing the metal shielding layer material, encapsulation layer structure, and touch layer composition, it takes into account display transmittance, structural reliability, and touch performance, and achieves an integrated and efficient design of display and touch functions.

[0088] The display device in this application embodiment can be any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, or navigator.

[0089] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0090] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0091] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A touch display panel, characterized in that, include: Substrate; The display functional layer is disposed on one side of the substrate and includes a plurality of light-emitting units; An encapsulation layer is disposed on the side of the display functional layer away from the substrate, and the orthographic projection of the light-emitting unit on the substrate is located within the orthographic projection of the encapsulation layer on the substrate; A metal shielding layer is disposed on the side of the encapsulation layer away from the substrate, and the metal shielding layer is grounded; An organic layer is disposed on the side of the metal shielding layer away from the substrate; A touch layer is disposed on the side of the organic layer away from the substrate, and the touch layer includes touch electrodes; Wherein, the orthographic projection of the metal shielding layer on the substrate and the orthographic projection of the touch layer on the substrate at least partially overlap, and a coupling capacitor is formed between the metal shielding layer and the touch layer; The orthographic projection of the organic layer on the substrate at least partially overlaps with the orthographic projection of the touch layer on the substrate, and the organic layer serves as the capacitor dielectric of the coupling capacitor.

2. The touch display panel according to claim 1, characterized in that, The size range of the touch display panel is 10 inches to 20 inches.

3. The touch display panel according to claim 1, characterized in that, The material of the metal shielding layer includes transparent metal.

4. The touch display panel according to claim 1, characterized in that, The metal shielding layer includes a mesh structure, and the material of the mesh structure includes a non-transparent metal.

5. The touch display panel according to claim 1, characterized in that, The touch display panel further includes a driving circuit layer, which includes multiple pixel driving circuits. The display function layer is located on the side of the driving circuit layer away from the substrate, and the pixel driving circuit is connected to the corresponding light-emitting unit.

6. The touch display panel according to claim 1, characterized in that, The light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode, which are sequentially stacked in a direction away from the substrate.

7. The touch display panel according to claim 1, characterized in that, The encapsulation layer includes a first encapsulation sublayer, a second encapsulation sublayer, and a third encapsulation sublayer stacked sequentially in a direction away from the substrate. The first encapsulation sublayer includes an inorganic material, the second encapsulation sublayer includes an organic material, and the third encapsulation sublayer includes an inorganic material.

8. The touch display panel according to claim 1, characterized in that, The touch layer further includes a touch protection layer, which is located on the side of the touch electrode away from the substrate, and the orthogonal projection of the touch electrode on the substrate is located within the orthogonal projection of the touch protection layer on the substrate.

9. A method for manufacturing a touch display panel, characterized in that, The method includes: Provide a substrate; A display functional layer is formed on one side of the substrate and patterned, and multiple light-emitting units are formed in the display functional layer; An encapsulation layer is disposed on the side of the display functional layer away from the substrate, such that the encapsulation layer covers the light-emitting unit; A metal shielding layer is provided and patterned on the side of the encapsulation layer away from the substrate, and the metal shielding layer is grounded; An organic layer is disposed on the side of the metal shielding layer away from the substrate; A touch layer is disposed on the side of the organic layer away from the substrate, so that a coupling capacitor is formed between the touch layer and the metal shielding layer, and the organic layer serves as the capacitor medium of the coupling capacitor.

10. A display device, characterized in that, Includes the touch display panel as described in any one of claims 1-8.

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