Touch display panel and touch display apparatus

Abstract

Disclosed are a touch display panel and a touch display apparatus. The touch display panel comprises: a substrate; a plurality of light-emitting devices, which are arranged on the substrate, wherein the plurality of light-emitting devices emit light of a plurality of colors; an encapsulation structure, which is located on the side of the plurality of light-emitting devices that is away from the substrate; a touch electrode layer, which is located on the side of the encapsulation structure that is away from the substrate; and a gray filter layer, which is located between the encapsulation structure and the touch electrode layer, so as to be reused as a touch buffer layer, wherein the orthographic projection of the gray filter layer on the substrate overlaps the orthographic projections of the plurality of light-emitting devices on the substrate.

Description

Touch display panel and touch display device Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a touch display panel and a touch display device. Background Technology

[0002] Currently, organic light-emitting diode (OLED) touch products are divided into two types: add-on and in-cell flexible multi-layer on-cell (FMLOC). Add-on touch products have a larger distance between the touch layer and the electrode layer of the display device, resulting in lower interlayer parasitic capacitance and less impact of display noise on touch signal transmission. This makes them suitable for small to medium-sized notebooks, mobile phones, and watches. However, they suffer from high noise levels in larger touch products, increasing the power consumption of the display panel. Integrating the color filter into OLED displays can reduce power consumption, decrease product thickness, and allow for bending. Summary of the Invention

[0003] This disclosure provides a touch display panel and a touch display device.

[0004] In a first aspect, this disclosure provides a touch display panel, comprising: a substrate; and a plurality of light-emitting devices disposed on the substrate, wherein the plurality of light-emitting devices emit a variety of colors;

[0005] The encapsulation structure is located on the side of the plurality of light-emitting devices away from the substrate; the touch electrode layer is located on the side of the encapsulation structure away from the substrate; the gray filter layer is located between the encapsulation structure and the touch electrode layer, and is reused as a touch buffer layer; the orthographic projection of the gray filter layer on the substrate overlaps with the orthographic projection of the plurality of light-emitting devices on the substrate.

[0006] In some embodiments, the transmission spectrum curve of the gray filter layer has multiple peaks, and the multiple peaks correspond one-to-one with the multiple colors of light emitted by the multiple light-emitting devices.

[0007] In some embodiments, the surface of the encapsulation structure away from the substrate has a recess corresponding to the light-emitting device, the recess being filled by the gray filter layer, and the surface of the gray filter layer away from the substrate being a flat surface.

[0008] In some embodiments, the encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer arranged sequentially along a direction away from the substrate, wherein the first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer are all bent toward the substrate at positions corresponding to the light-emitting device.

[0009] In some embodiments, the maximum thickness of the gray filter layer is less than the maximum thickness of the organic encapsulation layer.

[0010] In some embodiments, the surface of the encapsulation structure away from the substrate is a flat surface, and the gray filter layer is bonded to the flat surface.

[0011] In some embodiments, the encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer disposed sequentially along a direction away from the substrate, wherein the thickness of the gray filter layer is less than or equal to 2 / 3 of the maximum thickness of the organic encapsulation layer.

[0012] In some embodiments, the encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer sequentially disposed along a direction away from the substrate, wherein the material of the organic encapsulation layer is the same as the material of the gray filter layer.

[0013] In some embodiments, the touch electrode layer includes, in a direction away from the substrate, a first touch pattern layer, a touch insulating layer, and a second touch pattern layer, wherein the touch insulating layer is made of the same material as the gray filter layer.

[0014] In some embodiments, the gray filter layer has a transmittance of more than 42% for all colors of light emitted by the plurality of light-emitting devices.

[0015] In some embodiments, the touch display panel further includes a light-shielding layer located on the side of the touch electrode layer away from the substrate. The light-shielding layer has multiple light-transmitting openings, and the orthographic projection of the light-emitting device on the substrate overlaps with the orthographic projection of the light-transmitting openings on the substrate. The touch electrode layer includes, in sequence along a direction away from the substrate, a first touch pattern layer, a touch insulating layer, and a second touch pattern layer. The materials of the first touch pattern layer and the second touch pattern layer both include metal. The orthographic projections of the first touch pattern layer and the second touch pattern layer on the substrate are both located within the orthographic projection range of the light-shielding layer on the substrate.

[0016] In some embodiments, the second touch graphic layer is in contact with the light-shielding layer.

[0017] In some embodiments, the light-shielding layer covers the second touch graphics layer.

[0018] In some embodiments, the touch electrode layer includes a plurality of first touch electrodes extending along a first direction and a plurality of second touch electrodes extending along a second direction. The first touch electrodes include a plurality of first electrode units arranged along the first direction and a bridging portion electrically connected between two adjacent first electrode units. The first electrode units are electrically connected to the bridging portion through vias penetrating the touch insulating layer. The first electrode units and the second touch electrodes are both located in one of the first touch pattern layer and the second touch pattern layer, and the bridging portion is located in the other of the first touch pattern layer and the second touch pattern layer.

[0019] In some embodiments, the touch display panel further includes: a touch planarization layer located between the touch electrode layer and the light-shielding layer; and a cover layer located on the side of the light-shielding layer away from the substrate.

[0020] Secondly, this disclosure provides a touch display device, which includes the touch display panel described above. Attached Figure Description

[0021] Figure 1A is a schematic diagram of a first type of touch display panel provided in some embodiments of this disclosure.

[0022] Figure 1B is a transmission spectrum curve of the gray filter layer provided in some embodiments of this disclosure.

[0023] Figure 2 is a plan view of the touch electrode layer provided in some embodiments of this disclosure.

[0024] Figure 3 is a cross-sectional view along line A-A' in Figure 2.

[0025] Figure 4 is a schematic diagram of a second type of touch display panel provided in some embodiments of this disclosure.

[0026] Figure 5 is a schematic diagram of a third type of touch display panel provided in some embodiments of this disclosure.

[0027] Figure 6 is a schematic diagram of a fourth type of touch display panel provided in some embodiments of this disclosure.

[0028] Figure 7 is a schematic diagram of a fifth type of touch display panel provided in some embodiments of this disclosure.

[0029] Figure 8 is a schematic diagram of a sixth type of touch display panel provided in some embodiments of this disclosure.

[0030] Figure 9 is a schematic diagram of a seventh type of touch display panel provided in some embodiments of this disclosure.

[0031] Figure 10 is a schematic diagram of an eighth type of touch display panel provided in some embodiments of this disclosure.

[0032] Figure 11 is a schematic diagram of a ninth type of touch display panel provided in some embodiments of this disclosure.

[0033] Figure 12 is a schematic diagram of a tenth type of touch display panel provided in some embodiments of this disclosure.

[0034] Figure 13 is a schematic diagram of an eleventh type of touch display panel provided in some embodiments of this disclosure.

[0035] Figure 14 is a schematic diagram showing the connection between the driving circuit layer and the light-emitting device provided in some embodiments of this disclosure. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this disclosure do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this disclosure are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to such processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this disclosure are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” in this disclosure refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can indicate: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," "third," etc., used in this disclosure are merely to distinguish similar objects and do not represent a specific ordering of objects. "Above," "below," "left," "right," etc., are only used to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0038] To achieve the bending and rolling characteristics of OLED display panels, some touch display panels employ Thin Film Encapsulation (TFE) technology, integrating the touch technology onto the display substrate. Specifically, the touch display panel includes: a substrate, multiple light-emitting devices disposed on the substrate, an encapsulation structure for encapsulating the multiple light-emitting devices, and a touch electrode layer located on the side of the encapsulation structure away from the substrate. The multiple light-emitting devices include, for example, multiple red, green, and blue light-emitting devices. Additionally, a color filter can be provided on the light-emitting side of the light-emitting devices, with the color of the color filter matching the light emitted by the corresponding light-emitting device. Since the color filter can filter a certain amount of light, reducing the reflection of ambient light by the display panel, a circular polarizer is no longer necessary when a color filter is included in the display panel. Compared to a circular polarizer, the color filter has higher transmittance, thereby reducing the power consumption of the display panel.

[0039] However, in the manufacturing process of display panels, each color filter requires a patterning process. When the color filter includes three colors, namely red, green and blue, three patterning processes are required to create multiple color filters, which leads to complex processes and high mask costs.

[0040] Figure 1A is a schematic diagram of a first type of touch display panel provided in some embodiments of this disclosure. As shown in Figure 1A, the touch display panel includes: a substrate SUB, and a plurality of light-emitting devices 20, an encapsulation structure 30, a touch electrode layer 40 and a gray filter layer 50 disposed on the substrate SUB.

[0041] The multiple light-emitting devices 20 emit various colors, such as red, green, and blue. A packaging structure 30 is located on the side of the multiple light-emitting devices 20 away from the substrate SUB, and is used to encapsulate the multiple light-emitting devices 20. A touch electrode layer 40 is located on the side of the packaging structure 30 away from the substrate SUB, and is used to detect the touch position. A gray filter layer 50 is located on the side of the packaging structure 30 away from the substrate SUB.

[0042] In this embodiment, the gray filter layer 50 has a certain transmittance for each color of light emitted by the light-emitting device 20, and the transmittance is less than 100%, so it can also filter ambient light to a certain extent, thereby reducing the reflection of ambient light by the touch display panel. Furthermore, the gray filter layer 50 corresponding to each light-emitting device 20 is the same, and the gray filter layer 50 only needs to be fabricated once, thereby simplifying the manufacturing process and reducing production costs.

[0043] It should be noted that the gray filter layer 50 can be a whole film layer that covers the display area of ​​the touch display panel but does not cover the surrounding area. In this case, a patterning process is required to create the gray filter layer 50. Alternatively, the gray filter layer 50 can be a whole film layer that covers both the display area and the surrounding area. In this case, it is not necessary to pattern the gray filter layer 50.

[0044] Figure 1B shows the transmission spectrum curves of a gray filter layer provided in some embodiments of this disclosure. As shown in Figure 1B, the transmission spectrum curve of the gray filter layer has multiple peaks, each corresponding to a different color of light emitted by multiple light-emitting devices. For example, the colors of the light emitted by the multiple light-emitting devices include red, green, and blue. The transmission spectrum curve of the gray filter layer has transmittance troughs in the wavelength range of 480nm to 530nm and in the wavelength range of 580nm to 630nm. Thus, three transmittance peaks can be obtained for wavelengths of 380nm to 480nm, 480nm to 580nm, and 600nm to 780nm. These three peaks correspond to blue light, green light, and red light, respectively, enabling the gray filter layer to transmit three colors of light.

[0045] In some embodiments, the gray filter layer 50 has a transmittance greater than 42% for all colors of light emitted by the light-emitting device 20, thereby reducing the attenuation of light emitted by the light-emitting device 20 in the gray filter layer 50 and thus reducing the power consumption of the touch display panel. For example, the transmittance of the gray filter layer 50 for all colors of light emitted by the light-emitting device 20 is between 42% and 90%, or between 45% and 90%, or between 50% and 90%, or between 50% and 85%, or between 55% and 85%, thereby ensuring that the gray filter layer 50 has sufficient transmittance and reducing the reflection of ambient light by the touch display panel. Compared with using a circular polarizer to reduce the reflection of ambient light, since the transmittance of the gray filter layer 50 for the light emitted from each light-emitting device 20 is higher than that of a circular polarizer, the front light emission efficiency of the touch display panel can be improved and power consumption reduced when the gray filter layer 50 is provided.

[0046] Because the touch display panel of this embodiment has low power consumption, it can be applied to various display devices of large, medium and small sizes.

[0047] In some embodiments, the gray filter layer 50 may be made of organic materials.

[0048] The touch display panel in the embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0049] In some embodiments, the substrate SUB can be a rigid substrate, such as a glass substrate; or it can be a flexible substrate SUB, which can be made of a flexible organic material. For example, the organic material is a resin material such as polyimide, polycarbonate, polyacrylate, polyetherimide, polyethersulfone, polyethylene terephthalate, and polyethylene naphthalate.

[0050] As shown in Figure 1A, a driving circuit layer 10 is disposed on the substrate SUB. The driving circuit layer 10 includes pixel circuits for providing driving current to each light-emitting device 20. A pixel defining layer PDL and multiple light-emitting devices 20 are disposed on the side of the driving circuit layer 10 away from the substrate SUB. The pixel defining layer PDL has multiple pixel openings located in the display area of ​​the touch display panel. For example, each pixel opening corresponds to one light-emitting device 20. The material of the pixel defining layer PDL may include organic insulating materials such as polyimide, polyphthalamide, acrylic resin, benzocyclobutene, or phenolic resin.

[0051] The light-emitting device 20 can be an OLED device, comprising a first electrode 21, a light-emitting layer 23, and a second electrode 22 sequentially disposed along a direction away from the substrate SUB. For example, the first electrode 21 is an anode, and the second electrode 22 is a cathode. Multiple second electrodes 22 of the light-emitting devices 20 are connected to form a continuous second electrode layer. The first electrode 21 is located on the side of the pixel defining layer (PDL) near the driving circuit layer 10, and at least a portion of the first electrode 21 is exposed by a pixel opening. The light-emitting layer 23 is located within the pixel opening. It should be noted that the light-emitting device 20 may also include other film layers, for example, a hole injection layer and a hole transport layer located between the first electrode 21 and the light-emitting layer 23, and an electron transport layer and an electron injection layer located between the light-emitting layer 23 and the second electrode 22.

[0052] In some embodiments, as shown in FIG1A, a spacer PS is further disposed on the side of the pixel defining layer PDL away from the substrate SUB. The spacer PS can be made of organic materials, such as polyimide, polyphthalamide, polyamide, acrylic resin, benzocyclobutene, or phenolic resin. The second electrode layer covers the spacer PS.

[0053] As shown in Figure 1A, the orthographic projection of the spacer PS onto the substrate SUB lies within the orthographic projection range of the pixel defining layer PDL's surface away from the substrate SUB, thus preventing the second electrode layer from breaking. In one example, the cross-sections of both the spacer PS and the pixel defining layer PDL gradually increase along the direction close to the substrate SUB. The cross-sections of the spacer PS and the pixel defining layer PDL refer to the sections of the spacer PS perpendicular to the thickness direction of the substrate SUB and the pixel defining layer PDL perpendicular to the thickness direction of the substrate SUB, respectively. In one example, the slope angles of the side surfaces of the spacer PS and the pixel defining layer PDL are essentially the same, for example, both between 30° and 70°, further preventing the second electrode layer from breaking. The slope angle of the spacer PS (or pixel defining layer PDL) refers to the angle between the side surface of the spacer PS (or pixel defining layer PDL) and the bottom surface.

[0054] In some embodiments, as shown in FIG1A, the encapsulation structure 30 is disposed on the side of the plurality of light-emitting devices 20 away from the substrate SUB. For example, the encapsulation structure 30 includes, in sequence along the direction away from the substrate SUB, a first inorganic encapsulation layer 31, an organic encapsulation layer 33, and a second inorganic encapsulation layer 32. Both the first inorganic encapsulation layer 31 and the second inorganic encapsulation layer 32 can be made of highly dense inorganic materials such as silicon oxynitride (SiON), silicon oxide (SiOx), and silicon nitride (SiNx). The organic encapsulation layer 33 can be made of a polymer material containing a desiccant or a polymer material that can block moisture. For example, a polymer resin can be used to relieve stress on the first inorganic encapsulation layer 31 and the second inorganic encapsulation layer 32, and it can also include a water-absorbing material such as a desiccant to absorb water, oxygen, and other substances that penetrate the interior. In one example, the surfaces of the organic encapsulation layer 33 and the second inorganic encapsulation layer 32 away from the substrate SUB are both substantially flat surfaces.

[0055] In some embodiments, the maximum thickness of the organic encapsulation layer 33 is less than or equal to 12 micrometers to ensure that the surface of the organic encapsulation layer 33 away from the substrate SUB can form a flat surface, while preventing the emitted light from the light-emitting device 20 from being significantly attenuated in the organic encapsulation layer 33.

[0056] In some embodiments, as shown in FIG1A, a touch buffer layer TBL is disposed on the side of the package structure 30 away from the substrate SUB. For example, the touch buffer layer TBL can be made of inorganic or organic materials. A touch electrode layer 40 is disposed on the side of the touch buffer layer TBL away from the substrate SUB and is used to detect the occurrence of touch. In some embodiments, the touch electrode layer 40 includes a first touch pattern layer 41, a touch insulating layer TLD, and a second touch pattern layer 42 disposed along the side away from the substrate SUB.

[0057] Figure 2 is a plan view of the touch electrode layer 40 provided in some embodiments of this disclosure, and Figure 3 is a cross-sectional view of the touch electrode layer in Figure 2 along line A-A'. As shown in Figures 2 and 3, in some examples, the touch display panel has a display area DA and a peripheral area PA located around the display area DA. The touch electrode layer 40 includes a plurality of first touch electrodes extending along a first direction and a plurality of second touch electrodes extending along a second direction. The first direction and the second direction intersect, for example, they are perpendicular to each other. Both the first touch electrodes and the second touch electrodes are located in the display area DA. In this embodiment of the disclosure, the first touch electrode is used as a touch sensing electrode RX and the second touch electrode is used as a touch driving electrode TX for illustration. In other examples, the first touch electrode can also be used as the touch driving electrode TX and the second touch electrode can be used as the touch sensing electrode RX. As shown in Figures 2 and 3, the touch driving electrode TX and the touch sensing electrode RX are arranged intersectingly, and the intersection of the touch driving electrode TX and the touch sensing electrode RX is insulated and separated by a touch insulating layer TLD. The touch sensing electrode RX includes a plurality of first electrode units RX1 arranged along a first direction and a bridging portion RX2 connecting two adjacent first electrode units RX1; the touch driving electrode TX includes a plurality of second electrode units TX1 arranged along a second direction and a connecting portion TX2 connecting the second electrode units TX1. The touch driving electrode TX and the first electrode units RX1 are located in the second touch pattern layer 42, and the bridging portion RX2 is located in the first touch pattern layer 41. The first electrode units are electrically connected to the bridging portion RX2 through vias penetrating the touch insulating layer TLD. Of course, in other examples, the touch driving electrode TX and the first electrode units RX1 can also be disposed in the first touch pattern layer 41, and the bridging portion RX2 can be disposed in the second touch pattern layer 42.

[0058] In some embodiments, both the second touch pattern layer 42 and the first touch pattern layer 41 are made of metal material. For example, the first electrode unit, the second electrode unit, the connecting portion TX2 and the bridging portion RX2 are all made of metal mesh structure.

[0059] Of course, the first touch pattern layer 41 and the second touch pattern layer 42 can also be configured in other ways. For example, one of the first touch pattern layer 41 and the second touch pattern layer 42 includes a plurality of first touch electrodes, and the other includes a plurality of second touch electrodes. The first touch electrodes and the second touch electrodes are arranged crosswise and are insulated from each other.

[0060] In some embodiments, the touch display panel may further include touch signal lines (not shown), located in the peripheral area PA. The touch driving electrode TX and the touch sensing electrode RX are both electrically connected to the touch driving chip via the corresponding touch signal lines. In one example, the touch signal lines may have a two-layer structure. For instance, the touch signal lines include a first conductor disposed on the same layer as the first touch pattern layer and a second conductor disposed on the same layer as the second touch pattern layer. The first conductor and the second conductor are electrically connected through multiple vias to reduce the resistance of the touch signal lines.

[0061] In some embodiments, as shown in FIG1A, the touch planarization layer TOC is located on the side of the touch electrode layer 40 away from the substrate SUB; the gray filter layer 50 is located on the side of the touch planarization layer TOC away from the substrate SUB. The light-shielding layer BM is located on the side of the touch electrode layer 40 away from the substrate SUB. When the gray filter layer 50 is disposed on the side of the touch planarization layer TOC away from the substrate SUB, the light-shielding layer BM is located on the side of the gray filter layer 50 away from the substrate SUB. The light-shielding layer BM has multiple light-transmitting holes. The orthographic projection of the light-transmitting holes on the substrate SUB overlaps with the orthographic projection of the light-emitting device 20 on the substrate SUB. Furthermore, the orthographic projection of the light-shielding layer BM on the substrate SUB covers the orthographic projections of the first touch pattern layer 41 and the second touch pattern layer 42 on the substrate SUB, thereby reducing the reflection of ambient light by the first touch pattern layer 41 and the second touch pattern layer 42 and reducing the surface reflectivity of the touch display panel.

[0062] In some embodiments, the thickness of the gray filter layer 50 is less than or equal to 5 micrometers to reduce the attenuation of light from the light-emitting device 20 in the gray filter layer 50. For example, the thickness of the gray filter layer 50 is between 3 and 5 micrometers.

[0063] In some embodiments, as shown in FIG1A, the cover layer COC is located on the side of the light-shielding layer BM away from the substrate SUB, and the cover layer COC can be made of organic materials.

[0064] In some embodiments, as shown in FIG1A, a cover plate CG is provided on the side of the cover layer COC away from the substrate SUB, and the cover layer COC is bonded to the cover plate CG by an optical adhesive layer OCA.

[0065] The manufacturing method of the touch display panel shown in Figure 1A may include the following steps:

[0066] S1. A plurality of first electrodes 21 for light-emitting devices 20 are formed on a substrate SUB on which a driving circuit layer 10 is formed. For example, a metal layer is sputtered first, and then the metal layer is patterned to form a plurality of first electrodes 21.

[0067] S2. The pixel defining layer (PDL) and spacer material (PS) are formed sequentially. For example, the formation process of both the pixel defining layer (PDL) and the spacer material (PS) includes coating with an organic material, exposure, and development.

[0068] S3. The light-emitting layer 23 of each light-emitting device 20 is formed by vapor deposition process.

[0069] S4. Form the second electrode layer. For example, the second electrode layer can be formed by vapor deposition of a metal layer.

[0070] S5. The first inorganic encapsulation layer 31 is formed using chemical vapor deposition (CVD).

[0071] S6. An organic encapsulation layer 33 is formed using inkjet printing to encapsulate the nanoparticles deposited on the substrate in the previous process. Specifically, in step S6, a liquid organic material layer is first printed, and after the organic material layer is leveled, it is cured to form a flat organic encapsulation layer 33.

[0072] S7. A second inorganic encapsulation layer 32 is formed using chemical vapor deposition (CVD).

[0073] S8. Form an inorganic touch buffer layer (TBL) using chemical vapor deposition (CVD) or an organic touch buffer layer (TBL) by inkjet printing, coating, exposure, and development.

[0074] S9. Sputter a metal layer onto the touch buffer layer TBL and pattern it to form the first touch pattern layer 41.

[0075] S10. A touch insulating layer TLD is formed and patterned by chemical vapor deposition or coating, exposure and development, forming vias that penetrate the touch insulating layer TLD.

[0076] S11. A metal layer is sputtered and patterned on the touch insulating layer TLD to form a second touch pattern layer 42. A portion of the second touch pattern layer 42 is electrically connected to the first touch pattern layer 41 through a via.

[0077] S12. A touch planarization layer TOC is formed by inkjet printing or coating, exposure, and development.

[0078] S13. The gray filter layer 50 is formed by coating, exposure and development; or the gray filter layer 50 is formed by inkjet printing.

[0079] S14. A light-shielding layer BM is formed by inkjet printing or coating, exposure, and development.

[0080] S15. The COC coating is formed by inkjet printing or by coating, exposure, and development.

[0081] The cover plate CG can then be bonded to the side of the cover layer COC away from the substrate SUB using the optical adhesive layer OCA.

[0082] Figure 4 is a schematic diagram of a second type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 4 is similar to that in Figure 1A. The differences between the two will be described below.

[0083] In Figure 4, the gray filter layer 50 is located between the encapsulation structure 30 and the touch electrode layer 40, serving as a touch buffer layer. The touch electrode layer 40 is located on the side of the gray filter layer 50 away from the substrate SUB. For example, the touch electrode layer 40 is in contact with the surface of the gray filter layer 50 away from the substrate SUB to improve the adhesion of the touch electrode layer 40. Furthermore, the gray filter layer 50 is not disposed on the side of the touch planarization layer TOC away from the substrate SUB. In this case, a separate process is not required to fabricate the touch buffer layer. Therefore, compared to the touch display panel shown in Figure 1A, one patterning process can be reduced, further simplifying the manufacturing process. The gray filter layer 50 in Figure 4 can be made of organic materials.

[0084] In Figure 4, the light-shielding layer BM is located on the side of the touch electrode layer 40 away from the substrate SUB. When the gray filter layer is no longer provided on the side of the touch planarization layer TOC away from the substrate SUB, the light-shielding layer BM can be directly provided on the surface of the touch planarization layer TOC away from the substrate SUB, and part of the cover layer COC is in contact with the touch planarization layer TOC.

[0085] In Figure 4, the surface of the encapsulation structure 30 away from the substrate SUB is flat, and the gray filter layer 50 is bonded to this surface. Here, "bonded" means there is no gap between the surface of the gray filter layer 50 facing the substrate SUB and the surface of the encapsulation structure 30 away from the substrate SUB. The thickness of the gray filter layer 50 is less than the maximum thickness of the organic encapsulation layer 33, thus preventing excessive thickness of the gray filter layer 50 from causing significant attenuation of the emitted light from the light-emitting device 20 after passing through it.

[0086] In one example, the thickness of the gray filter layer 50 is less than or equal to 2 / 3 of the maximum thickness of the organic encapsulation layer 33. For example, the thickness of the gray filter layer 50 is less than or equal to 1 / 2 of the maximum thickness of the organic encapsulation layer 33. For example, if the maximum thickness of the organic encapsulation layer 33 is between 10 and 12 micrometers, the thickness of the gray filter layer 50 is less than or equal to 5 micrometers.

[0087] It should be noted that the "flat surface" in the embodiments of this disclosure refers to a generally flat surface, which may have fluctuations due to process errors. For example, the distance from any two positions on the surface to the substrate SUB does not exceed twice the thickness of the second inorganic packaging layer 32.

[0088] The remaining structures in Figure 4 are described in the same way as those in Figure 1A, and will not be repeated here.

[0089] The manufacturing method of the touch display panel shown in Figure 4 may include the above steps S1 to S7, followed by the following steps:

[0090] S28. A gray filter layer 50 of organic material is formed by inkjet printing or coating, exposure and development.

[0091] S29. A metal layer is sputtered onto the gray filter layer 50 and patterned to form the first touch pattern layer 41.

[0092] S210. A touch insulating layer TLD is formed and patterned by chemical vapor deposition or coating, exposure and development, forming vias that penetrate the touch insulating layer TLD.

[0093] S211. A metal layer is sputtered and patterned on the touch insulating layer TLD to form a second touch pattern layer 42. A portion of the second touch pattern layer 42 is electrically connected to the first touch pattern layer 41 through a via.

[0094] S212. A touch planarization layer TOC is formed by inkjet printing or coating, exposure, and development.

[0095] S213. A light-shielding layer BM is formed by inkjet printing or coating, exposure, and development.

[0096] S214. A cover layer COC is formed by inkjet printing or by coating, exposure, and development.

[0097] The cover plate CG can then be bonded to the side of the cover layer COC away from the substrate SUB using the optical adhesive layer OCA.

[0098] Figure 5 is a schematic diagram of a third type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 5 is similar to that in Figure 4. The differences between the two will be described below.

[0099] In Figure 5, the surface of the encapsulation structure 30 away from the substrate SUB is no longer a flat surface, but has a recess 30a corresponding to the light-emitting device 20. The recess 30a is filled with a gray filter layer 50, and the surface of the gray filter layer 50 away from the substrate SUB is a flat surface. The gray filter layer 50 is made of organic material.

[0100] The cross-sectional area of ​​the recessed portion 30a gradually decreases along the direction close to the substrate SUB. The cross-sectional area of ​​the recessed portion 30a refers to the area of ​​the cross section of the recessed portion 30a perpendicular to the thickness direction of the substrate SUB.

[0101] In one example, the orthographic projection of the bottom of the recess 30a onto the substrate SUB falls within the orthographic projection range of the pixel opening onto the substrate SUB. The recess 30a has a top opening facing away from the substrate SUB, and the orthographic projection of the top opening of the recess 30a onto the substrate SUB also falls within the orthographic projection range of the pixel opening onto the substrate SUB.

[0102] Specifically, as shown in Figure 5, the encapsulation structure 30 includes a first inorganic encapsulation layer 31, an organic encapsulation layer 33, and a second inorganic encapsulation layer 32 sequentially arranged along a direction away from the substrate SUB. The first inorganic encapsulation layer 31, the organic encapsulation layer 33, and the second inorganic encapsulation layer 32 are all bent towards the substrate SUB at positions corresponding to the light-emitting device 20. The surface of the encapsulation structure 30 away from the substrate SUB is the same as the surface of the second inorganic encapsulation layer 32 away from the substrate SUB. Since the first inorganic encapsulation layer 31, the organic encapsulation layer 33, and the second inorganic encapsulation layer 32 are all bent towards the substrate SUB at positions corresponding to the light-emitting device 20, the aforementioned recessed portion 30a is formed on the surface of the encapsulation structure 30 away from the substrate SUB at positions corresponding to the light-emitting device 20. The orthographic projections of the bent portions of the first inorganic encapsulation layer 31, the organic encapsulation layer 33, and the second inorganic encapsulation layer 32 onto the substrate SUB all cover the orthographic projection of the recessed portion 30a onto the substrate SUB.

[0103] Compared with Figure 4, the thickness of the first inorganic encapsulation layer 31 in Figure 5 remains unchanged; the thickness of the organic encapsulation layer 33 in Figure 5 is reduced. At this time, the leveling effect of the organic encapsulation layer 32 during the manufacturing process is reduced, so that the surface of the organic encapsulation layer 32 away from the substrate SUB in Figure 5 is no longer flat, but forms a depression at the position corresponding to the pixel opening; the thickness of the second inorganic encapsulation layer 32 in Figure 5 remains unchanged compared with Figure 4. Therefore, after the second inorganic encapsulation layer 32 is formed, the surface of the second inorganic encapsulation layer 32 away from the substrate SUB (i.e. the surface of the encapsulation structure 30 away from the substrate SUB) forms a depression 30a.

[0104] Compared to Figure 4, the organic encapsulation layer 33 is thinner in Figure 5, thereby reducing light attenuation in the encapsulation structure 30.

[0105] The maximum thickness of the gray filter layer 50 is less than the maximum thickness of the organic encapsulation layer 33, thereby reducing light attenuation in the gray filter layer 50 and saving material. For example, the maximum thickness of the organic encapsulation layer 33 in Figure 5 is less than or equal to 8 micrometers, and the maximum thickness of the gray filter layer 50 is less than or equal to 5 micrometers; for example, the maximum thickness of the organic encapsulation layer 33 is between 6 and 8 micrometers, and the maximum thickness of the gray filter layer 50 is between 3 and 5 micrometers.

[0106] Compared to Figure 4, the maximum thickness of the organic encapsulation layer 33 in Figure 4 is between 10 and 12 micrometers, and the thickness of the gray filter layer 50 is less than or equal to 5 micrometers. When the maximum thickness of the organic encapsulation layer 33 is set to 12 micrometers and the thickness of the gray filter layer 50 is 5 micrometers, the total thickness of the organic encapsulation layer 33 and the gray filter layer 50 above the light-emitting device 50 is 12 + 5 = 17 micrometers. However, in the touch display panel shown in Figure 5, when the maximum thickness of the organic encapsulation layer 33 is set to 8 micrometers and the maximum thickness of the gray filter layer 50 is set to 5 micrometers, the total thickness of the organic encapsulation layer 33 and the gray filter layer 50 above the light-emitting device 50 is 8 + 5 = 13 micrometers, which is smaller than the setting in Figure 4, thereby further reducing the light attenuation of light at various angles in the encapsulation structure 30 and the gray filter layer 50.

[0107] Figure 6 is a schematic diagram of a fourth type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 6 is similar to that in Figure 4, except that in Figure 6, the cover layer COC is no longer provided on the side of the light-shielding layer BM away from the substrate SUB, thereby further simplifying the manufacturing process.

[0108] When the cover layer COC is not provided on the side of the light-shielding layer BM away from the substrate SUB, the cover plate CG can be directly bonded to the side of the light-shielding layer BM and the touch planarization layer COC away from the substrate SUB using the optical adhesive layer OCA.

[0109] Figure 7 is a schematic diagram of a fifth type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 7 is similar to that in Figure 4. The differences between the two will be described below.

[0110] In the touch display panel shown in Figure 7, the touch planarization layer TOC is no longer provided between the second touch pattern layer 42 and the light-shielding layer BM, so that the light-shielding layer BM and the second touch pattern layer 42 are in direct contact, thereby further simplifying the structure of the touch display panel and simplifying the manufacturing process.

[0111] Furthermore, as shown in Figure 7, the light-shielding layer BM covers the second touch pattern layer 42, thereby further preventing the touch electrode layer 40 from reflecting ambient light. As mentioned above, the touch driving electrode and the first electrode unit in the second touch pattern layer 42 can adopt a metal mesh structure. In this case, the light-shielding layer BM covering the second touch pattern layer 42 means that the light-shielding layer BM covers the top and side surfaces of the metal lines in the metal mesh structure.

[0112] Figure 8 is a schematic diagram of a sixth type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 8 is similar to that in Figure 7, except that in Figure 8, the cover layer COC is no longer provided on the side of the light-shielding layer BM away from the substrate SUB, thereby further simplifying the structure of the touch display panel and simplifying the manufacturing process.

[0113] When the cover layer COC is not provided on the side of the light-shielding layer BM away from the substrate SUB, the cover plate CG can be directly bonded to the side of the light-shielding layer BM and the touch planarization layer COC away from the substrate SUB using the optical adhesive layer OCA.

[0114] It should be noted that for the touch display panel shown in Figure 5, the design method of Figures 6, 7 and 8 can also be used, omitting the touch planarization layer TOC and / or overlay layer COC in Figure 5.

[0115] Figure 9 is a schematic diagram of a seventh type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 9 is similar to that in Figure 1A, except that in Figure 9, the gray filter layer 50 is located between the first touch pattern layer 41 and the second touch pattern layer 42, that is, the gray filter layer 50 is reused as a touch insulating layer. In addition, unlike Figure 1A, in Figure 9, the gray filter layer 50 is no longer provided on the side of the touch planarization layer TOC away from the substrate SUB. At this time, the light-shielding layer BM is located on the surface of the touch planarization layer TOC away from the substrate SUB, and the cover layer COC covers the light-shielding layer BM, with a portion of the cover layer COC in contact with the touch planarization layer COC.

[0116] Compared to the structure in Figure 1A, the touch display panel shown in Figure 9 reuses the gray filter layer 50 as a touch insulating layer, and no longer sets the gray filter layer 50 on the side of the touch planarization layer TOC away from the substrate SUB. This reduces one patterning process and simplifies the fabrication process.

[0117] The manufacturing method of the touch display panel shown in Figure 9 may include the above steps S1 to S8, followed by the following steps:

[0118] S39. Sputter a metal layer onto the touch buffer layer TBL and pattern it to form the first touch pattern layer 41.

[0119] S310, A gray filter material layer is formed, and it is exposed and developed to form a gray filter layer 50 with through holes.

[0120] S311. A metal layer is sputtered and patterned on the gray filter layer 50 to form a second touch pattern layer 42. A portion of the second touch pattern layer 42 is electrically connected to the first touch pattern layer 41 through a via.

[0121] S312, The touch planarization layer TOC is formed by inkjet printing or coating, exposure and development.

[0122] S313, The light-shielding layer BM is formed by inkjet printing or coating, exposure and development.

[0123] S314. A COC coating is formed by inkjet printing or by coating, exposure, and development.

[0124] The cover plate CG can then be bonded to the side of the cover layer COC away from the substrate SUB using the optical adhesive layer OCA.

[0125] Figure 10 is a schematic diagram of an eighth type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 10 is similar to that in Figure 5, except that the material of the touch insulating layer TLD in Figure 10 is the same as the material of the gray filter layer 50 (touch buffer layer), thereby improving material utilization, reducing the frequency of adhesive replacement, and reducing production costs.

[0126] The sum of the thicknesses of the touch insulating layer TLD and the gray filter layer 50 is less than or equal to the maximum thickness of the organic encapsulation layer 33. By setting the total thickness of the touch insulating layer TLD and the gray filter layer 50 to be smaller, the attenuation of the light emitted by the light-emitting device 20 caused by the touch insulating layer TLD and the gray filter layer 50 can be reduced.

[0127] In one example, the maximum thickness of the organic encapsulation layer 33 is less than or equal to 8 micrometers, and the sum of the thicknesses of the touch insulating layer TLD and the gray filter layer 50 is less than or equal to 5 micrometers. For example, the maximum thickness of the organic encapsulation layer 33 is between 6 and 8 micrometers, and the sum of the thicknesses of the touch insulating layer TLD and the gray filter layer 50 is between 3 and 5 micrometers.

[0128] It should be noted that Figure 10 is essentially based on Figure 5, except that the touch insulating layer TLD in Figure 5 is made of the same material as the gray filter layer 50. Of course, in other examples, the touch insulating layer TLD can also be made of the same material as the gray filter layer 50 based on any of Figures 4, 6, 7, and 8.

[0129] Figure 11 is a schematic diagram of a ninth type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 11 is similar to that in Figure 10, except that the materials of the touch insulating layer TLD and the organic encapsulation layer 33 are the same as the materials of the gray filter layer 50 (touch buffer layer), thereby further improving material utilization and reducing production costs.

[0130] It should be noted that, in Figure 11, the same materials can be used to make the organic encapsulation layer 33 and the gray filter layer 50, while different materials can be used to make the touch insulating layer TLD.

[0131] Figure 12 is a schematic diagram of a tenth type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 12 is similar to that in Figure 4, except that in Figure 12, the material of the organic encapsulation layer 33 is the same as the material of the gray filter layer 50, thereby improving material utilization and reducing production costs.

[0132] It should be noted that, in Figure 12, the same material as the gray filter layer 50 can also be used to fabricate the organic encapsulation layer 33 and the touch insulating layer TLD.

[0133] Figure 13 is a schematic diagram of an eleventh type of touch display panel provided in some embodiments of this disclosure. The touch display panel shown in Figure 13 is similar to that in Figure 1A, except that in Figure 13, the gray filter layer 50 is located between the first inorganic encapsulation layer 31 and the second inorganic encapsulation layer 32, and the gray filter layer 50 is reused as an organic encapsulation layer.

[0134] In addition, unlike Figure 1A, in Figure 13, the gray filter layer 50 is no longer provided on the side of the touch planarization layer TOC away from the substrate SUB, the light-shielding layer BM is located on the surface of the touch planarization layer TOC away from the substrate SUB, and part of the cover layer COC is in contact with the touch planarization layer TOC.

[0135] Compared to Figure 1A, the touch display panel in Figure 13 reuses the gray filter layer as an organic encapsulation layer, which simplifies the overall structure of the touch display panel and reduces one process step.

[0136] In Figure 13, the gray filter layer 50 can be formed by coating, exposure, and development. The maximum thickness of the gray filter layer 50 can be less than or equal to 5 micrometers, thereby reducing the attenuation of light from the light-emitting device 20 in the gray filter layer 50.

[0137] It should be noted that in Figure 13, the touch insulating layer TLD can be made of inorganic materials or the same material as the gray filter layer 50.

[0138] It should also be noted that for the touch display panels shown in Figures 9 to 13, the design method of Figures 6, 7 and 8 can also be used, omitting the touch flat layer TOC and / or the cover layer COC.

[0139] Figure 14 is a schematic diagram showing the connection between the driving circuit layer 10 and the light-emitting device 20 in some embodiments of this disclosure. In some embodiments, the driving circuit layer 10 includes multiple pixel circuits, which are electrically connected to the light-emitting device 20 and are used to provide driving signals to the light-emitting device 20. Pixel electrodes may include multiple transistors T1 and at least one capacitor C1. Only one transistor T1 and one capacitor C1 are shown in Figure 14.

[0140] In some embodiments, a semiconductor layer is disposed on a substrate SUB. The material of the semiconductor layer may include, for example, inorganic semiconductor materials (e.g., polycrystalline silicon, amorphous silicon, etc.), organic semiconductor materials, and oxide semiconductor materials. The semiconductor layer includes an active layer T1a for each transistor T1. The active layer T1a includes a channel portion and source and drain connection portions located on opposite sides of the channel portion. The source connection portion is connected to the source T1s of transistor T1, and the drain connection portion is connected to the drain T1d of transistor T1. Both the source and drain connection portions may be doped with impurities (e.g., N-type or P-type impurities) with a higher impurity concentration than the channel portion. The channel portion is directly opposite the gate T1g of transistor T1. When the voltage signal applied to the gate T1g reaches a certain value, a carrier path is formed in the channel portion, enabling the source T1s and drain T1d of transistor T1 to conduct.

[0141] In one example, to prevent or reduce the diffusion of metal atoms and / or impurities from the substrate SUB into the active layer T1a of the transistor T1, a buffer layer BFL can be provided between the semiconductor layer and the substrate SUB.

[0142] In some embodiments, a first gate insulating layer GI1 is disposed on the semiconductor layer, and the material of the first gate insulating layer GI1 may include a silicon compound. For example, the material of the first gate insulating layer GI1 includes silicon oxynitride (SiON), silicon oxide (SiOx), silicon nitride (SiNx), silicon carbide (SiOxCy), silicon carbide nitride (SiCxNy), etc. In addition, the first gate insulating layer GI1 may be a single layer or multiple layers.

[0143] In some embodiments, a first gate electrode layer is disposed on a first gate insulating layer GI1. The first gate electrode layer includes the gate T1g of each transistor T1 and the first electrode plate C11 of the capacitor C1. The material of the first gate electrode layer may include, for example, metal, metal alloy, metal nitride, conductive metal oxide, transparent conductive material, etc. For example, the first gate electrode layer may include gold (Au), gold alloys, silver (Ag), silver alloys, aluminum (Al), aluminum alloys, aluminum nitride (AlNx), tungsten (W), tungsten nitride (WNx), copper (Cu), copper alloys, nickel (Ni), chromium (Cr), chromium nitride (CrNx), molybdenum (Mo), molybdenum alloys, titanium (Ti), titanium nitride (TiNx), platinum (Pt), tantalum (Ta), tantalum nitride (TaNx), neodymium (Nd), scandium (Sc), strontium ruthenium oxide (SRO), zinc oxide (ZnOx), tin oxide (SnOx), indium oxide (InOx), gallium oxide (GaOx), indium tin oxide (ITO), indium zinc oxide (IZO), etc. The first gate electrode layer may have a single layer or multiple layers.

[0144] In some embodiments, as shown in FIG14, a second gate insulating layer GI2 is disposed on the first gate electrode layer G1, and the material of the second gate insulating layer GI2 may be selected from the materials of the first gate insulating layer GI1 listed above. The second gate insulating layer GI2 may be formed as a single layer or multiple layers.

[0145] In some embodiments, as shown in FIG14, a second gate electrode layer is disposed on a second gate insulating layer GI2. The second gate electrode layer may include a second electrode plate C12 of a capacitor. The material of the second gate electrode layer is selected from the materials of the first gate electrode layer listed above. The second gate electrode layer may have a single layer or multiple layers.

[0146] In some embodiments, as shown in FIG14, an interlayer insulating layer (ILD) is disposed on the second gate electrode layer. The material of the interlayer insulating layer (ILD) may include, for example, silicon compounds, metal oxides, etc. Specifically, silicon compounds and metal oxides listed above can be selected, which will not be elaborated here.

[0147] In some embodiments, as shown in FIG14, a source-drain conductive layer is disposed on the interlayer insulating layer (ILD). The source-drain conductive layer may include the source T1s and drain T1d of each transistor T1 in the display area, with the source T1s connected to each other and the drain T1d connected to each other. The source-drain conductive layer may include metal, alloy, metal nitride, conductive metal oxide, transparent conductive material, etc. For example, the source-drain conductive layer may be a single layer or multiple layers made of metal, such as Mo / Al / Mo or Ti / Al / Ti. The transistor T1 shown in FIG14 includes a gate T1g, a source T1s33, a drain T1d, and an active layer T1a.

[0148] In some embodiments, as shown in FIG14, a passivation layer PVX is disposed on a first source / drain conductive layer. The material of the passivation layer PVX may include silicon compounds, such as silicon oxide, silicon nitride, or silicon oxynitride.

[0149] In some embodiments, as shown in FIG14, the planarization layer PLN is located on the side of the passivation layer PVX away from the substrate SUB, and the surface of the planarization layer PLN away from the substrate SUB is substantially flat. The planarization layer PLN is made of an organic insulating material, such as polyimide, epoxy resin, acrylic, polyester, photoresist, polyacrylate, polyamide, siloxane, and other resin-based materials. Alternatively, the organic insulating material may include an elastic material, such as urethane, thermoplastic polyurethane (TPU), etc.

[0150] In some embodiments, as shown in FIG14, the first electrode 21 of the light-emitting device 20 is disposed on the side of the planarization layer PLN away from the substrate SUB, and is electrically connected to the drain T1d of the transistor T1 through a via penetrating the planarization layer PLN. The first electrode 21 can be made of materials such as metal, metal alloy, metal nitride, conductive metal oxide, transparent conductive material, etc. The first electrode 21 can be a single-layer or multi-layer structure.

[0151] This disclosure also provides a touch display device, including the touch display panel described in the above embodiments. The touch display panel may further include a touch chip, which provides touch driving signals to the touch electrode layer and receives sensing signals from the touch electrode layer, thereby determining the touch position based on the sensing signals. The touch display panel in this disclosure uses a gray filter layer 50 to filter light, thereby reducing the reflection of ambient light by the touch display panel. Furthermore, the gray filter layer 50 corresponding to each light-emitting device 20 is identical, requiring only one patterning process to fabricate the gray filter layer 50, thus simplifying the manufacturing process and reducing production costs. Further, the gray filter layer 50 can also be reused as a touch buffer layer, further simplifying the manufacturing process. Therefore, the manufacturing process of the touch display device using the above-described touch display panel is also correspondingly simplified.

[0152] The touch display device can include any device or product with display functionality. For example, a touch display device can be a smartphone, mobile phone, e-book reader, desktop computer (PC), laptop PC, netbook PC, personal digital assistant (PDA), portable multimedia player (PMP), digital audio player, mobile medical device, camera, wearable device (such as head-mounted devices, electronic clothing, electronic bracelets, electronic necklaces, electronic accessories, or smartwatches), television set, etc.

[0153] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A touch display panel, comprising: Substrate; Multiple light-emitting devices are disposed on the substrate, and the light-emitting devices emit a variety of colors; The packaging structure is located on the side of the plurality of light-emitting devices away from the substrate; The touch electrode layer is located on the side of the packaging structure away from the substrate; A gray filter layer is located between the encapsulation structure and the touch electrode layer, and is reused as a touch buffer layer; the orthographic projection of the gray filter layer on the substrate overlaps with the orthographic projection of the plurality of light-emitting devices on the substrate.

2. The touch display panel according to claim 1, wherein, The transmission spectrum curve of the gray filter layer has multiple peaks, and each of the multiple peaks corresponds to a different color of light emitted by the multiple light-emitting devices.

3. The touch display panel according to claim 1, wherein, The surface of the encapsulation structure away from the substrate has a recess corresponding to the light-emitting device, the recess is filled by the gray filter layer, and the surface of the gray filter layer away from the substrate is a flat surface.

4. The touch display panel according to claim 3, wherein, The encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer arranged sequentially in a direction away from the substrate. The first inorganic encapsulation layer, the organic encapsulation layer, and the second inorganic encapsulation layer are all bent toward the substrate at positions corresponding to the light-emitting device.

5. The touch display panel according to claim 4, wherein, The maximum thickness of the gray filter layer is less than the maximum thickness of the organic encapsulation layer.

6. The touch display panel according to claim 1, wherein, The surface of the encapsulation structure away from the substrate is a flat surface, and the gray filter layer is attached to the flat surface.

7. The touch display panel according to claim 6, wherein, The encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer arranged sequentially along a direction away from the substrate, wherein the thickness of the gray filter layer is less than or equal to 2 / 3 of the maximum thickness of the organic encapsulation layer.

8. The touch display panel according to claim 1, wherein, The encapsulation structure includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer arranged sequentially along a direction away from the substrate. The material of the organic encapsulation layer is the same as the material of the gray filter layer.

9. The touch display panel according to any one of claims 1 to 8, wherein, The touch electrode layer includes, in sequence along a direction away from the substrate, a first touch pattern layer, a touch insulating layer, and a second touch pattern layer, wherein the touch insulating layer is made of the same material as the gray filter layer.

10. The touch display panel according to any one of claims 1 to 8, wherein, The gray filter layer has a transmittance of more than 42% for all colors of light emitted by the plurality of light-emitting devices.

11. The touch display panel according to any one of claims 1 to 8, wherein, The touch display panel further includes a light-shielding layer, which is located on the side of the touch electrode layer away from the substrate. The light-shielding layer has multiple light-transmitting openings, and the orthographic projection of the light-emitting device on the substrate overlaps with the orthographic projection of the light-transmitting openings on the substrate. The touch electrode layer includes, in sequence along a direction away from the substrate, a first touch pattern layer, a touch insulating layer, and a second touch pattern layer. The materials of the first touch pattern layer and the second touch pattern layer both include metal. The orthographic projections of the first touch pattern layer and the second touch pattern layer on the substrate are both located within the orthographic projection range of the light-shielding layer on the substrate.

12. The touch display panel according to claim 11, wherein, The second touch graphic layer is in contact with the light-shielding layer.

13. The touch display panel according to claim 12, wherein, The light-shielding layer covers the second touch graphics layer.

14. The touch display panel according to claim 11, wherein, The touch electrode layer includes a plurality of first touch electrodes extending along a first direction and a plurality of second touch electrodes extending along a second direction. The first touch electrode includes a plurality of first electrode units arranged along the first direction and a bridging portion electrically connected between two adjacent first electrode units. The first electrode units are electrically connected to the bridging portion through a through-hole penetrating the touch insulating layer. The first electrode unit and the second touch electrode are both located in one of the first touch pattern layer and the second touch pattern layer, and the bridging portion is located in the other of the first touch pattern layer and the second touch pattern layer.

15. The touch display panel according to claim 11, wherein, The touch display panel also includes: A touch planarization layer is located between the touch electrode layer and the light-shielding layer; A cover layer is located on the side of the light-shielding layer away from the substrate.

16. A touch display device, wherein, Includes the touch display panel according to any one of claims 1 to 15.

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