Touch display panel and fabrication method therefor, and display device

Abstract

Disclosed in the embodiments of the present disclosure are a touch display panel and a fabrication method therefor, and a display device. The touch display panel comprises: a display panel, wherein the display panel comprises a display region, and the display region comprises a plurality of sub-pixel regions and spacing regions for spacing the plurality of sub-pixel regions apart from one another; a touch layer disposed on a light-emergent side of the display panel, wherein the touch layer comprises touch electrodes disposed in the display region and arranged around the sub-pixel regions; a first refractive-index layer disposed on the side of the touch layer facing away from the display panel, wherein the first refractive-index layer comprises protruding structures located in the sub-pixel regions and first structures located in the spacing regions; a black matrix disposed on the side of the first structures facing away from the display panel, wherein the orthographic projection of the black matrix on the display panel covers the orthographic projections of the touch electrodes on the display panel; and a second refractive-index layer disposed on the side of the black matrix facing away from the display panel, wherein the second refractive-index layer at least covers the top surfaces of the protruding structures facing away from the display panel and the side surfaces connected to the top surfaces, and the refractive index of the first refractive-index layer is greater than the refractive index of the second refractive-index layer.

Description

A touch display panel, its manufacturing method, and a display device

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411034772.7, filed on July 30, 2024, entitled "A Touch Display Panel and its Manufacturing Method, Display Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of display technology, and in particular to a touch display panel, its manufacturing method, and a display device. Background Technology

[0004] Organic light-emitting diode (OLED) display panels possess numerous advantages, including self-illumination, ultra-thinness, fast response speed, high contrast, and wide viewing angle, making them a widely popular type of display panel. OLED display panels typically employ a thin-film encapsulation (TFE) structure—an inorganic-organic-inorganic layer layer—to encapsulate the organic light-emitting material within the display panel, thereby blocking water and oxygen and protecting the organic light-emitting material.

[0005] To achieve touch display on OLED display panels, touch structures are typically fabricated directly on the TFE film layer of the OLED display panel, which is known as Flexible Multi-Layer On Cell (FMLOC) touch technology. This technology enables the fabrication of lighter and thinner display devices and can be applied to foldable and rollable OLED display devices.

[0006] To reduce the reflectivity of external light within the OLED display panel and to reduce the overall thickness of the display panel, the related technology utilizes COE (CF on Encapsulation) technology, which involves removing the polarizer (POL), and adding a color filter structure to the TFE film layer of the OLED display panel. Summary of the Invention

[0007] This disclosure provides a touch display panel, a method for manufacturing the same, and a display device, the specific solutions of which are as follows:

[0008] This disclosure provides a touch display panel, comprising:

[0009] The display panel includes a display area, which includes a plurality of sub-pixel areas and a spacing area that separates the plurality of sub-pixel areas from each other;

[0010] A touch layer is located on the light-emitting side of the display panel, and the touch layer includes touch electrodes located in the display area and surrounding the sub-pixel area;

[0011] A first refractive index layer is located on the side of the touch layer opposite to the display panel. The first refractive index layer includes a protrusion structure located in each of the sub-pixel areas and a first structure located in the spacing area. The first structure covers the touch electrode.

[0012] A black matrix is ​​located on the side of the first structure opposite to the display panel, and the orthographic projection of the black matrix on the display panel covers the orthographic projection of the touch electrode on the display panel;

[0013] The second refractive index layer is located on the side of the black matrix facing away from the display panel. The second refractive index layer at least covers the top surface of the protrusion structure facing away from the display panel and the side surface connected to the top surface. The refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer.

[0014] Optionally, in the touch display panel provided in the embodiments of this disclosure, the orthographic projection of the black matrix on the display panel covers the orthographic projection of the top surface of the first structure facing away from the display panel on the display panel.

[0015] Optionally, in the touch display panel provided in the embodiments of this disclosure, the orthographic projection of the black matrix on the display panel also covers the orthographic projection of the side surface connected to the top surface of the first structure on the display panel.

[0016] Optionally, in the touch display panel provided in the embodiments of this disclosure, the cross-section of the protruding structure is a trapezoid.

[0017] Optionally, in the touch display panel provided in the embodiments of this disclosure, the cross-section of the first structure is a trapezoid, the first structure and the protrusion structure are spaced apart, and the thickness of the first structure and the thickness of the protrusion structure are the same.

[0018] Optionally, in the touch display panel provided in the embodiments of this disclosure, the first refractive index layer further includes a second structure located in each of the sub-pixel areas and between the protrusion structure and the touch layer. The thickness of the second structure is the same as the thickness of the first structure, and the protrusion structure, the second structure and the first structure are an integral structure.

[0019] Optionally, in the touch display panel provided in the embodiments of this disclosure, the orthographic projection of the second refractive index layer on the display panel covers the display area of ​​the display panel.

[0020] Optionally, the touch display panel provided in the embodiments of this disclosure further includes a filter layer located on the side of the second refractive index layer facing away from the display panel, the filter layer including color filter structures that correspond one-to-one with the sub-pixel areas.

[0021] Optionally, in the touch display panel provided in the embodiments of this disclosure, the refractive index of the first refractive index layer is greater than 1.8, and the refractive index of the second refractive index layer is 1.4 to 1.5.

[0022] Optionally, in the touch display panel provided in the embodiments of this disclosure, the second refractive index layer includes a color filter structure that is disposed in a one-to-one correspondence with the sub-pixel area, and the color filter structure covers the top surface of the protrusion structure away from the display panel and the side surface connected to the top surface.

[0023] Optionally, in the touch display panel provided in the embodiments of this disclosure, the refractive index of the first refractive index layer is greater than 1.8, and the refractive index of the second refractive index layer is 1.6 to 1.7.

[0024] Optionally, in the touch display panel provided in the embodiments of this disclosure, the black matrix is ​​configured with a plurality of first openings corresponding one-to-one with the sub-pixel areas, and each of the color filter structures is located in the corresponding first opening area.

[0025] Optionally, in the touch display panel provided in the embodiments of this disclosure, adjacent color filter structures are contacted, and the orthographic projection of the contact boundary of the adjacent color filter structures on the display panel is located within the orthographic projection of the black matrix on the display panel.

[0026] Optionally, the touch display panel provided in the embodiments of this disclosure further includes a touch protection layer located on the side of the color filter structure facing away from the display panel.

[0027] Optionally, in the touch display panel provided in the embodiments of this disclosure, the display panel further includes a non-display area surrounding the display area. The non-display area includes at least one barrier wall disposed around the display area. The first refractive index layer is located at the edge of the non-display area, ending at the side of the barrier wall closest to the display area facing the display area. The black matrix is ​​located at the edge of the non-display area, ending at the side of the barrier wall closest to the display area facing the display area.

[0028] Optionally, in the touch display panel provided in the embodiments of this disclosure, the black matrix is ​​located at the edge of the non-display area and is approximately flush with the edge of the first refractive index layer located in the non-display area.

[0029] Optionally, in the touch display panel provided in the embodiments of this disclosure, the display panel includes: a driving backplate, and a pixel defining layer located between the driving backplate and the touch layer; the pixel defining layer includes a plurality of second openings corresponding one-to-one with the sub-pixel areas;

[0030] The orthographic projection boundary of the protrusion structure on the display panel is located within the orthographic projection of the pixel defining layer on the display panel.

[0031] Optionally, in the touch display panel provided in the embodiments of this disclosure, the distance between the orthographic projection boundary of the protrusion structure on the display panel and the orthographic projection boundary of the inner wall of the second opening on the display panel is 1 to 2 μm.

[0032] Optionally, in the touch display panel provided in the embodiments of this disclosure, the display panel further includes: a light-emitting functional layer located between the pixel defining layer and the touch layer, and an encapsulation layer located between the light-emitting functional layer and the touch layer;

[0033] The light-emitting functional layer includes multiple light-emitting units, which are located inside the second opening, and each light-emitting unit corresponds to one of the second openings.

[0034] Optionally, in the touch display panel provided in the embodiments of this disclosure, the touch layer includes a touch buffer layer, a first metal layer, a touch insulating layer and a second metal layer stacked together, and the touch buffer layer is close to the display panel;

[0035] The second metal layer includes the touch electrode, which includes a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction, wherein the first direction intersects the second direction;

[0036] The first touch electrode includes a plurality of first electrode blocks arranged along the second direction, and two adjacent first electrode blocks are electrically connected through a first connecting portion. The second touch electrode includes a plurality of second electrode blocks arranged along the first direction, and two adjacent second electrode blocks are electrically connected through a second connecting portion.

[0037] The first connecting portion is located in the second metal layer, and the second connecting portion is located in the first metal layer;

[0038] The first electrode block, the second electrode block, the first connecting portion, and the second connecting portion are respectively grid-like structures arranged around the sub-pixel area.

[0039] Accordingly, this disclosure also provides a display device, including the touch display panel described above in this disclosure.

[0040] Accordingly, this disclosure also provides a method for manufacturing a touch display panel, including:

[0041] A display panel is formed, the display panel including a display area, the display area including a plurality of sub-pixel areas and a spacing area that separates the plurality of sub-pixel areas from each other;

[0042] A touch layer is formed on the light-emitting side of the display panel, the touch layer including touch electrodes located in the display area and disposed around the sub-pixel area;

[0043] A first refractive index layer is formed on the side of the touch layer opposite to the display panel. The first refractive index layer includes a protrusion structure located in each of the sub-pixel areas and a first structure located in the spacing area. The first structure covers the touch electrode.

[0044] A black matrix is ​​formed on the side of the first structure opposite to the display panel, and the orthographic projection of the black matrix on the display panel covers the orthographic projection of the touch electrode on the display panel;

[0045] A second refractive index layer is formed on the side of the black matrix facing away from the display panel. The second refractive index layer covers at least the top surface of the protrusion structure facing away from the display panel and the side surface connected to the top surface. The refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer.

[0046] Optionally, in the above-described fabrication method provided in this disclosure embodiment, forming the first refractive index layer specifically includes:

[0047] A first refractive index material film layer is formed on the side of the touch layer opposite to the display panel;

[0048] A photoresist layer is formed on the side of the first refractive index material film layer that is away from the display panel;

[0049] The photoresist layer is patterned using a halftone mask process to form a first photoresist pattern including a photoresist fully retained area, a photoresist partially retained area, and a photoresist completely removed area. The photoresist fully retained area corresponds at least to the sub-pixel area, the photoresist partially retained area corresponds at least to the spacing area, and the photoresist completely removed area corresponds at least to the area where the barrier of the non-display area is located.

[0050] Using the first photoresist pattern as a mask, the first refractive index material film is etched to remove at least the first refractive index material film above the area where the barrier is located;

[0051] The first photoresist pattern is subjected to graying treatment to remove the photoresist in the partially preserved area and thin the photoresist in the fully preserved area to form a second photoresist pattern.

[0052] Using the second photoresist pattern as a mask, the first refractive index material film layer corresponding to the photoresist semi-retained region is etched to form the protrusion structure located in the sub-pixel region, the second structure located in the sub-pixel region and between the protrusion structure and the touch layer, and the first structure located in the interval region. The protrusion structure, the second structure and the first structure are an integral structure.

[0053] Remove the second photoresist pattern. Attached Figure Description

[0054] Figure 1 is a schematic diagram of the planar structure of a touch display panel provided in an embodiment of this disclosure;

[0055] Figure 2 is a cross-sectional schematic diagram of the molecular pixel region inside the display area of ​​Figure 1;

[0056] Figure 3 is a schematic diagram of the cross section along the CC' direction in Figure 1;

[0057] Figure 4 is a schematic diagram of the specific structure of another touch display panel provided in an embodiment of this disclosure;

[0058] Figure 5 is a schematic diagram of the specific structure of another touch display panel provided in an embodiment of this disclosure;

[0059] Figure 6 is a top view of the touch display panel shown in Figure 5;

[0060] Figure 7 is a schematic diagram of the specific structure of another touch display panel provided in an embodiment of this disclosure;

[0061] Figure 8 is a schematic diagram of the specific structure of another touch display panel provided in an embodiment of this disclosure;

[0062] Figure 9 is a schematic diagram of the specific structure of another touch display panel provided in an embodiment of this disclosure;

[0063] Figure 10 is a schematic diagram of the specific structure of another touch display panel provided in an embodiment of this disclosure;

[0064] Figure 11 is a schematic flowchart of a method for manufacturing a touch display panel according to an embodiment of this disclosure;

[0065] Figure 12A is a schematic diagram of the manufacturing process of the touch display panel shown in Figure 7 according to an embodiment of this disclosure;

[0066] Figure 12B is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0067] Figure 12C is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0068] Figure 12D is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0069] Figure 12E is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0070] Figure 12F is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0071] Figure 12G is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0072] Figure 12H is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0073] Figure 12I is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0074] Figure 12J is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0075] Figure 12K is another structural schematic diagram of the touch display panel shown in Figure 7 during the manufacturing process according to an embodiment of this disclosure;

[0076] Figure 13 is a schematic diagram of the structure of a display device provided in an embodiment of this disclosure. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0078] 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 "comprising" or "including," and similar terms as used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0079] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual proportions and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0080] This disclosure provides a touch display panel, including a display panel 100 and a touch layer 200 located on the light-emitting side of the display panel 100, as shown in FIG1. ​​FIG1 is a schematic diagram of the planar structure of the touch display panel. The display panel 100 includes a display area AA and a non-display area BB surrounding the display area AA. The display area AA generally includes multiple sub-pixel areas and a spacing area that separates the multiple sub-pixel areas from each other. The non-display area BB includes at least one barrier wall disposed around the display area AA. This disclosure takes two barrier walls as an example, such as a first barrier wall Dam1 close to the display area AA and a second barrier wall Dam2 located on the side of the first barrier wall Dam1 away from the display area AA. The setting of the barrier wall can improve the water and oxygen barrier performance of the display panel 100.

[0081] Specifically, as shown in Figure 2, which is a cross-sectional schematic diagram of the molecular pixel area inside the display area AA of Figure 1, the display panel 100 includes: a driving backplate 1, a pixel defining layer 2 located between the driving backplate 1 and the touch layer 200, a light-emitting functional layer 3 located between the pixel defining layer 2 and the touch layer 200, and an encapsulation layer 4 located between the light-emitting functional layer 3 and the touch layer 200. The pixel defining layer 2 includes a plurality of second openings 201 corresponding one-to-one with the sub-pixel areas. The light-emitting functional layer 3 includes a plurality of light-emitting units 31, which are located within the second openings 201 and correspond one-to-one with each second opening 201. The light-emitting unit 31 may include an anode layer 311, an organic light-emitting layer 312, and a cathode layer 313 sequentially stacked on the driving backplate 1. The anode layer 311 is generally fabricated before the pixel defining layer 2. In this embodiment, the encapsulation layer 4 not only isolates the light-emitting functional layer 3 from the outside world, preventing water and oxygen from invading the organic light-emitting layer 312 in the light-emitting functional layer 3 of the display panel 100 and affecting the lifespan of the display panel, but also the surface of the encapsulation layer 4 facing away from the driving backplate 1 is flat, so that the film layer (e.g., the touch layer) that is subsequently manufactured can be manufactured on the flat surface, which is more conducive to improving the touch display effect of the touch display panel.

[0082] It should be noted that the light-emitting unit in the embodiments of this disclosure can be an OLED device or a quantum dot light-emitting diode (QLED) device, etc., and there is no specific limitation thereto.

[0083] In some embodiments, as shown in FIG2, the driving backplane 1 includes: a substrate 11, and a buffer layer 12, an active layer 13, a first gate insulating layer 14, a first gate metal layer 15, a second gate insulating layer 16, a second gate metal layer 17, an interlayer dielectric layer 18, a first source / drain metal layer 19 (SD1), a passivation layer 20, a first planarization layer 21, a second source / drain metal layer 22 (SD2), a second planarization layer 23, a third source / drain metal layer 24 (SD3), and a third planarization layer 25, which are sequentially stacked between the substrate 11 and the light-emitting functional layer 3. The anode layer 311 can be electrically connected to the source or drain of the first source / drain metal layer 19 via a lap electrode located on the second source / drain metal layer 22.

[0084] Optionally, the substrate 11 can be a rigid substrate or a flexible substrate. The rigid substrate can be, but is not limited to, glass, etc.; the flexible substrate can be, but is not limited to, polyethylene terephthalate, polyethylene terephthalate, polyimide, etc.

[0085] Specifically, as shown in Figure 2, the first source / drain metal layer 19 is generally provided with source, drain, data lines, etc., the second source / drain metal layer 22 is generally provided as a bonding electrode for bonding the anode layer 311 and the source / drain, and the third source / drain metal layer 24 is generally based on the FIAA technology used in narrow bezel products. This technology adds a third source / drain metal layer 24 and a third planarization layer 25. The third source / drain metal layer 24 is mainly used for data signal lines in the fanout area of ​​the display panel 100 to achieve the narrow bezel design of the bottom bezel.

[0086] In some embodiments, in the touch display panel provided in the present disclosure, as shown in Figures 1-3, Figure 3 is a cross-sectional schematic diagram along the CC' direction in Figure 1. The encapsulation layer 4 may include a first inorganic layer 41, an organic material layer 42, and a second inorganic layer 43 stacked together. The first barrier Dam1 and the second barrier Dam2 can both be formed by stacking sub-barriers that are on the same layer as the planarization layer (e.g., the first planarization layer 21 and the second planarization layer 23) and the pixel defining layer 2 in the display area AA. The first barrier Dam1... The height is generally less than the height of the second barrier Dam2. For example, the first barrier Dam1 is formed by sub-barriers 001 and 002 that are disposed on the same layer as the second planarization layer 23 and the pixel defining layer 2 in the display area AA. The second barrier Dam2 is formed by sub-barriers 001, 002 and 003 that are disposed on the same layer as the first planarization layer 21, the second planarization layer 23 and the pixel defining layer 2 in the display area AA. The edge of the organic material layer 42 of the encapsulation layer 4 ends at the inner side of the first barrier Dam1 that is closest to the display area AA.

[0087] Specifically, as shown in Figures 1 and 2, a touch layer 200 is formed on the encapsulation layer 4 of the display panel 100. The touch layer 200 includes touch electrodes located in the display area AA and disposed around the sub-pixel area. Specifically, the touch layer 200 includes a touch buffer layer 5, a first metal layer 6, a touch insulating layer 7, and a second metal layer 8 stacked together. The touch buffer layer 5 is close to the display panel 100.

[0088] The second metal layer 8 includes touch electrodes, which include a plurality of first touch electrodes 81 arranged along the first direction X and a plurality of second touch electrodes 82 arranged along the second direction Y. The first direction X and the second direction Y intersect. In this embodiment, the first direction X and the second direction Y are perpendicular to each other.

[0089] The first touch electrode 81 includes a plurality of first electrode blocks 811 arranged along the second direction Y, and two adjacent first electrode blocks 811 are electrically connected through a first connecting part 91. The second touch electrode 82 includes a plurality of second electrode blocks 821 arranged along the first direction X, and two adjacent second electrode blocks 821 are electrically connected through a second connecting part 92.

[0090] The first connection portion 91 can be located in the second metal layer 8, that is, the first electrode block 811, the second electrode block 821 and the first connection portion 91 are disposed in the same layer, and the second connection portion 92 can be located in the first metal layer 6; in the following description, the film layer where the first electrode block 811, the second electrode block 821 and the first connection portion 91 are located is called the TMB layer, and the film layer where the second connection portion 92 is located is called the TMA layer.

[0091] The first electrode block 811, the second electrode block 821, the first connecting part 91, and the second connecting part 92 are respectively grid-like structures arranged around the sub-pixel area.

[0092] Specifically, as shown in Figure 1, the non-display area BB can be divided into four border areas: upper, lower, left, and right. The lower border area generally includes a bonding area B1. The touch layer 200 also includes a touch lead 210 electrically connected to the first touch electrode 81 and the second touch electrode 82. The touch lead 210 extends from the display area AA to the bonding area B1 of the lower border. The touch lead 210 is generally located between the first barrier Dam1 and the display area AA in the upper, left, and right borders. In the lower border, the touch lead 210 needs to cross the first barrier Dam1 and the second barrier Dam2 and extend to the bonding area B1.

[0093] In some embodiments, in the touch display panel provided in this disclosure, as shown in FIG1, the lower frame area further includes a bending area BD located between the second barrier Dam2 and the bonding area B1; as shown in FIG1 and FIG3, the portion of the touch lead 210 leading out from the display area AA to the bending area BD generally uses double-layer metal traces. For example, the touch lead 210 includes a first sub-lead located in the TMA layer and a second sub-lead located in the TMB layer. The first sub-lead and the second sub-lead are electrically connected through a via penetrating the touch insulating layer 7 to reduce the resistance of the touch lead 210; the portion of the touch lead 210 located in the bending area BD is generally jumpered to the SD2 layer, and the portion of the touch lead 210 located in the bonding area B1 is jumpered to the TMA layer and the TMB layer, that is, the portion of the touch lead 210 located in the bonding area B1 uses the first sub-lead and the second sub-lead that are electrically connected. It should be noted that FIG3 only shows the second sub-lead of the touch lead 210 located in the TMB layer.

[0094] It should be noted that the touch lead 210 can also be routed in a single layer. For example, some touch leads 210 can be placed on the TMA layer and some touch leads 210 can be placed on the TMB layer, which can save wiring space.

[0095] In some embodiments, as shown in FIG1, in the touch display panel provided in the present disclosure, the bonding area B1 includes a driver chip (IC) area and a flexible circuit board (FPC) area. The driver chip (IC) is used to provide electrical signals to the display panel 100, and the flexible circuit board (FPC) is used to provide electrical signals to the driver chip (IC) and the touch layer 200. The flexible circuit board (FPC) area of ​​the bonding area B1 includes a plurality of bonding pads 300, and the touch lead 210 is electrically connected to the bonding pads 300 on both sides of the FPC.

[0096] Optionally, of the first touch electrode 81 and the second touch electrode 82, one is a driving electrode and the other is a sensing electrode.

[0097] Specifically, the touch insulating layer 7 can be made of organic materials, such as PI.

[0098] Specifically, the touch buffer layer 5 can be made of organic materials, such as PI; or it can be made of inorganic materials, such as silicon nitride, silicon oxide, silicon oxynitride, etc.

[0099] Specifically, as shown in Figure 2, the touch display panel further includes a first refractive index layer 30 located on the side of the touch layer 200 facing away from the display panel 100. The first refractive index layer 30 includes a protrusion structure 32 located in each sub-pixel area and a first structure 33 located in the spacing area. The first structure 33 covers the touch electrodes (81 / 82). The touch display panel also includes a black matrix 40 located on the side of the first structure 33 facing away from the display panel 100, and a second refractive index layer 50 located on the side of the black matrix 40 facing away from the display panel 100. The black matrix 40 is located on the positive side of the display panel 100. The projection covers the orthographic projection of the touch electrodes (81 / 82) on the display panel 100, that is, the orthographic projection of the black matrix 40 on the display panel 100 covers the orthographic projection of the spacing area between the sub-pixel areas on the display panel 100; the second refractive index layer 50 at least covers the top surface 321 of the protrusion structure 32 facing away from the display panel 100 and the side surface 322 connected to the top surface 321. The refractive index of the first refractive index layer 30 is greater than the refractive index of the second refractive index layer 50, so that a high and low refractive index interface composed of the first refractive index layer 30 and the second refractive index layer 50 can be formed at the edge of the sub-pixel area.

[0100] The touch display panel provided in this embodiment improves light extraction efficiency by utilizing the refractive index difference between a high-refractive-index first refractive-index layer and a low-refractive-index second refractive-index layer, causing the light emitted by the light-emitting unit to be refracted at the interface between the first and second refractive-index layers. This allows more light to exit from the corresponding sub-pixel area. On the other hand, the first refractive-index layer is formed before the black matrix. Compared to the first refractive-index layer being formed after the black matrix, the raised structure of this disclosure can avoid the opening of the black matrix. That is, when the raised structure is made, there is no influence of the black matrix pattern around it, and the slope angle morphology around the raised structure can be better controlled (e.g., the slope angle symmetry is better relative to the set slope angle), which is beneficial to improving light extraction efficiency. This can reduce the L-Decay (the light intensity attenuation curve of the display panel as a function of viewing angle) and reduce color shift and other problems of the touch display panel.

[0101] In some embodiments of the touch display panel provided in this disclosure, as shown in FIG2, the orthographic projection of the black matrix 40 on the display panel 100 covers the orthographic projection of the top surface 331 of the first structure 33 away from the display panel 100. Specifically, by providing the first structure 33 covering the touch electrode, the first refractive index layer 30 can avoid the developing solution from corroding or affecting the touch electrode during the subsequent fabrication of the black matrix 40 and other film layers.

[0102] In some embodiments of the touch display panel provided in this disclosure, as shown in FIG2, the cross-section of the protrusion structure 32 is a trapezoid. Since the refractive index of the first refractive index layer 30 is greater than that of the second refractive index layer 50, this is similar to forming a convex lens structure above the sub-pixel area. This structure can focus the light emitted by the light-emitting unit 31 and improve the light extraction efficiency.

[0103] In some embodiments, in the touch display panel provided in the present disclosure, as shown in FIG2, the cross-section of the first structure 33 is a trapezoid, the first structure 33 and the protrusion structure 32 are spaced apart, the thickness of the first structure 33 and the thickness of the protrusion structure 32 can be the same, and of course the thickness of the first structure 33 and the thickness of the protrusion structure 32 can have an error of ±5%.

[0104] It should be noted that the above-mentioned trapezoid refers to a shape similar to a trapezoid. Due to the influence of the manufacturing process, the surface of the protruding structure 32 and the first structure 33 facing away from the display panel 100 in the cross-section may be curved.

[0105] In some embodiments, in the touch display panel provided in this disclosure, as shown in FIG2, the orthographic projection of the second refractive index layer 50 on the display panel 100 can cover the display area AA of the display panel 100. Specifically, the material of the second refractive index layer 50 can be an organic material such as epoxy resin, and the material of the first refractive index layer 30 can be an organic material such as epoxy resin doped with inorganic ions such as zirconium oxide to increase the refractive index of the first refractive index layer 30. For example, the refractive index of the first refractive index layer 30 is generally greater than 1.8, and the refractive index of the second refractive index layer 50 is generally 1.4 to 1.5, thereby forming a high and low refractive index interface and improving the light extraction efficiency.

[0106] In some embodiments of the touch display panel provided in this disclosure, as shown in FIG2, a filter layer 60 is further included on the side of the second refractive index layer 50 facing away from the display panel 100. The filter layer 60 includes color filter structures (R, G, B) corresponding one-to-one with the sub-pixel areas. Specifically, the display area of ​​the display panel 100 has multiple sub-pixel areas, such as red sub-pixel areas, green sub-pixel areas, and blue sub-pixel areas. The color filter structures correspondingly include red filter structures (e.g., red color filter R), green filter structures (e.g., green color filter G), and blue filter structures (e.g., blue color filter B). On the one hand, the color filter structures can filter the emitted light to improve the color purity of the emitted light; on the other hand, the color filter structures can filter the ambient light entering the touch display panel, thereby reducing the reflection of ambient light by the touch display panel and improving the user experience.

[0107] In some embodiments, in the touch display panel provided in the present disclosure, as shown in FIG2, the black matrix 40 is arranged with a plurality of first openings 401 corresponding one-to-one with the sub-pixel areas, and each color filter structure (R, G, B) is located in the corresponding first opening 401 area, that is, adjacent color filter structures (R, G, B) are not in close contact.

[0108] Specifically, as shown in Figure 2, the distance between the orthographic projection boundary of the black matrix 40 on the display panel 100 and the orthographic projection boundary of the first refractive index layer 30 on the display panel 100 can be 0.5 to 1 μm.

[0109] In some embodiments, as shown in FIG2, in the touch display panel provided in the present disclosure, the thickness of the first refractive index layer 30 can be 2 to 3.5 μm, and the thickness of the black matrix 40 can be 1.2 to 1.8 μm.

[0110] In some embodiments, in the touch display panel provided in the present disclosure, as shown in FIG1 and FIG3, the first refractive index layer 30 is located at the edge of the non-display area BB, which ends at the side of the barrier closest to the display area AA (i.e., the first barrier Dam1) facing the display area AA, and the black matrix 40 is located at the edge of the non-display area BB, which ends at the side of the barrier closest to the display area AA (i.e., the first barrier Dam1) facing the display area AA. Specifically, the setting of the first barrier Dam1 results in a large step difference between the side of the first barrier Dam1 near the display area AA and the first barrier Dam1, which easily leads to the risk of black matrix 40 peeling. This disclosure forms a first refractive index layer 30 with a larger thickness before the black matrix 40. The first refractive index layer 30 can reduce the step difference between the side of the first barrier Dam1 near the display area AA and the first barrier Dam1. Therefore, when the black matrix 40 is formed, the black matrix 40 will not accumulate too thickly in the step difference area. Thus, the black matrix 40 can be fully exposed during exposure, avoiding black matrix 40 peeling during development and improving the performance of the touch display panel.

[0111] In some embodiments, in the touch display panel provided in the present disclosure, as shown in Figures 1 and 3, the edge of the black matrix 40 located in the non-display area BB is set approximately flush with the edge of the first refractive index layer 30 located in the non-display area BB, for example, with a deviation of ±5% width on the left and right.

[0112] In some embodiments, as shown in FIG2, in the touch display panel provided in the present disclosure, the slope angle of the raised structure 32 and the first structure 33 can be 50 to 80°, and the light emission efficiency corresponding to the slope angle in this range is better.

[0113] In some embodiments, as shown in FIG2, in the above-described touch display panel provided in the present disclosure, the orthographic projection boundary of the protrusion structure 32 on the display panel 100 is located within the orthographic projection of the pixel defining layer 2 on the display panel 100. In this way, the protrusion structure 32 can completely cover the sub-pixel area, which is beneficial for converging the light emitted from the light-emitting unit 31 in the sub-pixel area.

[0114] In some embodiments of the touch display panel provided in this disclosure, as shown in FIG2, the distance 'a' between the orthographic projection boundary of the protruding structure 32 on the display panel 100 and the orthographic projection boundary of the inner wall of the second opening 201 on the display panel 100 can be 1 to 2 μm, and the distance 'b' between the orthographic projection boundary of the first structure 33 on the display panel 100 and the orthographic projection boundary of the inner wall of the second opening 201 on the display panel 100 can be 5 to 7 μm. This ensures that the protruding structure 32 can completely cover the sub-pixel area while also ensuring that the protruding structure 32 and the first structure 33 are spaced apart.

[0115] In some embodiments, as shown in FIG2, the touch display panel provided in the present disclosure further includes a touch protection layer 400 located on the side of the color filter structure (R, G, B) facing away from the display panel 100. The touch protection layer 400 can protect the color filter structure (R, G, B), thereby protecting the display effect of the touch display panel and improving the reliability of the touch display panel. The material of the touch protection layer 400 can be an organic material, such as PI.

[0116] In some embodiments, this disclosure also provides a touch display panel, as shown in FIG4. The structure of the touch display panel shown in FIG4 is basically the same as that shown in FIG2. The only difference between the two is the structure of the color filter structure (R, G, B). The remaining film layer structures are the same, and it has the same technical effect as the touch display panel shown in FIG2. Specifically, as shown in FIG4, adjacent color filter structures (R, G, B) are arranged in contact, and the orthographic projection of the contact boundary of adjacent color filter structures (R, G, B) on the display panel 100 is located within the orthographic projection of the black matrix 40 on the display panel 100.

[0117] In some embodiments, this disclosure also provides a touch display panel, as shown in Figures 5 and 6. Figure 6 is a top view of the touch display panel shown in Figure 5. The structure of the touch display panel shown in Figure 5 is basically the same as that shown in Figure 2. The only difference between the two is the structure of the black matrix 40. The remaining film layer structures are the same, and it has the same technical effect as the touch display panel shown in Figure 2. Specifically, as shown in Figure 5, the orthographic projection of the black matrix 40 on the display panel 100 also covers the orthographic projection of the side surface 332 connected to the top surface 331 of the first structure 33 on the display panel 100. In this way, when the screen is off and external light shines on the touch display panel, the ambient light reflected through the internal structure of the touch display panel can be reduced, making the screen darker in the off state and improving the contrast.

[0118] Specifically, as shown in Figure 5, the distance c between the orthographic projection boundary of the black matrix 40 on the display panel 100 and the orthographic projection boundary of the inner wall of the second opening 201 on the display panel 100 can be 4 to 6 μm.

[0119] It should be noted that the color filter structure (R, G, B) in the touch display panel shown in Figure 5 can also be set by touch.

[0120] In some embodiments, this disclosure also provides a touch display panel, as shown in FIG7. The structure of the touch display panel shown in FIG7 is basically the same as that shown in FIG2. The only difference between the two is the structure of the first refractive index layer 30. The structures of the other film layers are the same, and it has the same technical effect as the touch display panel shown in FIG2. Specifically, as shown in FIG7, the first refractive index layer 30 includes a protrusion structure 32 located in each sub-pixel area and a first structure 33 located in the spacing area. The first structure 33 covers the touch electrodes (81 / 82). The first refractive index layer 30 also includes a second structure 34 located in each sub-pixel area and between the protrusion structure 32 and the touch layer 200. The thickness of the second structure 34 is the same as the thickness of the first structure 33, and the protrusion structure 32, the second structure 34 and the first structure 33 are an integral structure. Thus, the second structure 34 and the first structure 33 are equivalent to a flat layer below the raised structure 32. The first refractive index layer 30 can be fabricated using a half-tone mask process, that is, a structure with the raised structure 32 is fabricated in the sub-pixel area, and the second structure 34 and the first structure 33 located between the raised structure 32 and the touch layer 200 are fabricated in the sub-pixel area and the spacing area; then a black matrix 40 is fabricated on the first structure 33 above the touch electrode area.

[0121] It should be noted that the color filter structure (R, G, B) in the touch display panel shown in Figure 7 can also be set by touch.

[0122] In some embodiments, this disclosure also provides a touch display panel, as shown in FIG8. The structure of the touch display panel shown in FIG8 is basically the same as that shown in FIG2. The only difference between the two is the structure of the second refractive index layer 50. The structures of the other film layers are the same, and it has the same technical effect as the touch display panel shown in FIG2. Specifically, as shown in FIG8, the second refractive index layer 50 includes color filter structures (R, G, B) that are arranged one-to-one with the sub-pixel areas. The color filter structures (R, G, B) cover the top surface 321 of the protrusion structure 32 facing away from the display panel 100 and the side surface 322 connected to the top surface 321. Specifically, the color filter structure (R, G, B) is the same as the structure shown in Figure 2 above. Since the refractive index of the color filter structure (R, G, B) is generally 1.6 to 1.7, this embodiment directly uses the color filter structure (R, G, B) as a low refractive index layer. Thus, when the color filter structure (R, G, B) directly covers the raised structure 32, a high-low refractive index interface can be formed above the sub-pixel area, forming a structure similar to a convex lens, thereby improving light extraction efficiency. Therefore, compared to the structure shown in Figure 2, the structure shown in Figure 8 of this embodiment can save the fabrication of the second refractive index layer 50 in Figure 2, reducing one mask and lowering manufacturing costs.

[0123] It should be noted that the orthographic projection of the black matrix 40 in the touch display panel shown in Figure 8 onto the display panel 100 can also cover the orthographic projection of the side surface 332 connected to the top surface 331 of the first structure 33 onto the display panel 100.

[0124] In some embodiments, this disclosure also provides a touch display panel, as shown in FIG9. The structure of the touch display panel shown in FIG9 is basically the same as that shown in FIG8. The only difference between the two is the structure of the second refractive index layer 50. The structures of the other film layers are the same. It not only has the same technical effect as the touch display panel shown in FIG2, but also reduces one mask. Specifically, as shown in FIG9, adjacent color filter structures (R, G, B) are arranged in contact, and the orthographic projection of the contact boundary of adjacent color filter structures (R, G, B) on the display panel 100 is located within the orthographic projection of the black matrix 40 on the display panel 100.

[0125] It should be noted that the orthographic projection of the black matrix 40 in the touch display panel shown in Figure 9 onto the display panel 100 can also cover the orthographic projection of the side surface 332 connected to the top surface 331 of the first structure 33 onto the display panel 100.

[0126] In some embodiments, this disclosure also provides a touch display panel, as shown in FIG10. The structure of the touch display panel shown in FIG10 is basically the same as that shown in FIG8. The only difference between the two is the structure of the first refractive index layer 30. The structures of the remaining film layers are the same. It not only has the same technical effect as the touch display panel shown in FIG2, but also reduces one mask. Specifically, as shown in FIG10, the structure of the first refractive index layer 30 in FIG10 can be referred to the structure of the first refractive index layer 30 shown in FIG7.

[0127] It should be noted that the color filter structure (R, G, B) in the touch display panel shown in Figure 10 can also be set by touch.

[0128] In specific implementations, the touch display panel provided in the embodiments of this disclosure may also include other functional film layers well known to those skilled in the art, which will not be described in detail here.

[0129] Based on the same inventive concept, this disclosure also provides a method for manufacturing a touch display panel, used to manufacture the touch display panels provided above, as shown in FIG11. The manufacturing method may include:

[0130] S1101. Form a display panel, the display panel including a display area, the display area including multiple sub-pixel areas and a spacing area that separates the multiple sub-pixel areas from each other;

[0131] S1102. A touch layer is formed on the light-emitting side of the display panel, the touch layer including touch electrodes located in the display area and disposed around the sub-pixel area;

[0132] S1103. A first refractive index layer is formed on the side of the touch layer away from the display panel. The first refractive index layer includes a protrusion structure located in each sub-pixel area and a first structure located in the spacing area. The first structure covers the touch electrode.

[0133] S1104. A black matrix is ​​formed on the side of the first structure away from the display panel, and the orthogonal projection of the black matrix on the display panel covers the orthogonal projection of the touch electrode on the display panel.

[0134] S1105. A second refractive index layer is formed on the side of the black matrix away from the display panel. The second refractive index layer at least covers the top surface of the protrusion structure away from the display panel and the side surface connected to the top surface. The refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer.

[0135] The following is a detailed description of the manufacturing method of the touch display panel shown in Figure 7, which includes the following steps:

[0136] (1) As shown in Figure 12A, a display panel 100 is formed. The display panel 100 includes a driving backplate 1, a pixel defining layer 2, a light-emitting functional layer 3 and an encapsulation layer 4. The manufacturing methods, film materials, film thicknesses and other aspects of these structures are the same as those in the prior art and will not be described in detail here.

[0137] (2) As shown in Figure 12B, a touch layer 200 is formed on the light-emitting side of the display panel 100, i.e. the encapsulation layer 4. The touch layer 200 includes a touch buffer layer 5, a first metal layer 6, a touch insulating layer 7 and a second metal layer 8 stacked together. The manufacturing methods, materials and thicknesses of these layers are the same as in the prior art and will not be described in detail here.

[0138] (3) As shown in Figure 12C, a first refractive index material film layer 30' with a refractive index greater than 1.8 is formed on the side of the touch layer 200 away from the display panel 100.

[0139] (4) As shown in Figure 12D, a photoresist layer 500 is formed on the side of the first refractive index material film layer 30' that is away from the display panel 100.

[0140] (5) As shown in Figure 12E, the photoresist layer 500 is patterned by halftone masking to form a first photoresist pattern 500' including a photoresist fully retained area 501, a photoresist partially retained area 502 and a photoresist completely removed area (not shown). The photoresist fully retained area 501 corresponds to at least the sub-pixel area, the photoresist partially retained area 502 corresponds to at least the spacing area, and the photoresist completely removed area corresponds to at least the area where the barriers (Dam1 and Dam2) of the non-display area BB in Figure 3 are located.

[0141] (6) As shown in Figure 3, the first refractive index material film layer 30' is etched using the first photoresist pattern 500' as a mask, at least removing the first refractive index material film layer above the area where the barrier (Dam1 and Dam2) is located.

[0142] (7) As shown in Figure 12F, the first photoresist pattern 500' is ablated to remove the photoresist in the semi-retained area 502 and thin the photoresist in the fully retained area 501 to form the second photoresist pattern 500.

[0143] (8) As shown in Figure 12G, the first refractive index material film layer 30' corresponding to the photoresist semi-retained region 502 is etched using the second photoresist pattern 500” as a mask to form a protrusion structure 32 located in the sub-pixel region, a second structure 34 located in the sub-pixel region and between the protrusion structure 32 and the touch layer 200, and a first structure 33 located in the spacer region, thus forming a first refractive index layer 30 including the protrusion structure 32, the second structure 34 and the first structure 33.

[0144] (9) As shown in Figure 12H, remove the second photoresist pattern 500.

[0145] (10) As shown in Figure 12I, a black matrix 40 is formed on the side of the first refractive index layer 30 away from the display panel 100. The orthographic projection of the black matrix 40 on the display panel 100 covers the orthographic projection of the touch electrode on the display panel. The manufacturing method and film material of the black matrix are the same as those in the prior art, and will not be described in detail here.

[0146] (11) As shown in Figure 12J, a second refractive index layer 50 covering the display area AA is formed on the side of the black matrix 40 away from the display panel 100. The refractive index of the first refractive index layer 30 is greater than the refractive index of the second refractive index layer 50.

[0147] (12) As shown in Figure 12K, a filter layer 60 is formed on the side of the second refractive index layer 50 away from the display panel 100. The filter layer 60 includes color filter structures (R, G, B) that are arranged one-to-one with the sub-pixel areas.

[0148] (13) A touch protection layer 400 is formed on the side of the filter layer 60 away from the display panel 100, thus forming the touch display panel shown in FIG7.

[0149] It should be noted that the manufacturing method of the touch display panel shown in Figure 10 is basically the same as that shown in Figure 7. The difference is that when manufacturing the touch display panel shown in Figure 10, it is not necessary to manufacture the second refractive index layer 50 in Figure 7. Instead, a color filter structure (R, G, B) is used as the second refractive index layer 50.

[0150] It should be noted that the manufacturing method of the touch display panel shown in Figure 2 is basically the same as that shown in Figure 7. The difference is that the first refractive index layer 30 in the touch display panel shown in Figure 2 can be directly manufactured using ordinary exposure and development process, without the need for halftone mask process.

[0151] It should be noted that the manufacturing method of the touch display panel shown in Figure 4 is basically the same as that shown in Figure 7. The difference is that the first refractive index layer 30 in the touch display panel shown in Figure 4 can be directly produced using ordinary exposure and development processes without the need for halftone masking. Furthermore, the adjacent color filter structures (R, G, B) in Figure 4 are in contact.

[0152] It should be noted that the manufacturing method of the touch display panel shown in Figure 5 is basically the same as that shown in Figure 7. The difference is that the first refractive index layer 30 in the touch display panel shown in Figure 5 can be directly produced using ordinary exposure and development process, without the need for halftone mask process, and the black matrix 40 in Figure 5 covers the top surface 331 and side surface 332 of the first structure 33.

[0153] It should be noted that the manufacturing method of the touch display panel shown in Figure 8 is basically the same as that shown in Figure 7. The difference is that the first refractive index layer 30 in the touch display panel shown in Figure 8 can be directly produced using ordinary exposure and development process, without the need for halftone mask process. Furthermore, when manufacturing the touch display panel shown in Figure 8, it is not necessary to manufacture the second refractive index layer 50 in Figure 7. Instead, a color filter structure (R, G, B) is used as the second refractive index layer 50.

[0154] It should be noted that the manufacturing method of the touch display panel shown in Figure 9 is basically the same as that shown in Figure 7. The difference is that the first refractive index layer 30 in the touch display panel shown in Figure 9 can be directly produced using ordinary exposure and development processes without the need for halftone masking. Furthermore, when manufacturing the touch display panel shown in Figure 9, it is not necessary to manufacture the second refractive index layer 50 in Figure 7. Instead, a color filter structure (R, G, B) is used as the second refractive index layer 50, and adjacent color filter structures (R, G, B) in Figure 9 are in contact.

[0155] Based on the same inventive concept, this disclosure also provides a display device, including the touch display panel described above. The principle by which this display device solves the problem is similar to that of the aforementioned touch display panel; therefore, the implementation of this display device can refer to the implementation of the aforementioned touch display panel, and the repetitions will not be repeated here.

[0156] In specific implementations, the display device provided in the embodiments of this disclosure may further include a cover plate covering the touch display panel. Specifically, the cover plate may be a rigid cover plate or a flexible cover plate.

[0157] In specific implementation, the display device provided in the embodiments of this disclosure may be a full-screen display device or a flexible display device, etc., and is not limited thereto.

[0158] In specific implementations, the display device provided in this disclosure embodiment can be a full-screen mobile phone as shown in FIG13. Of course, the display device provided in this disclosure embodiment can also be any product or component with display function, such as a tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of the display device are those that should be understood by those skilled in the art, and will not be described in detail here, nor should they be construed as limiting this disclosure.

[0159] The touch display panel, manufacturing method, and display device provided in this disclosure, on the one hand, utilize the refractive index difference between a high-refractive-index first refractive index layer and a low-refractive-index second refractive index layer to refract the light emitted by the light-emitting unit at the interface between the first and second refractive index layers, allowing more light to exit from the corresponding sub-pixel area, thereby improving light extraction efficiency; on the other hand, the first refractive index layer of this disclosure is formed before the black matrix. Compared to the first refractive index layer being manufactured after the black matrix, the raised structure of this disclosure can avoid the opening of the black matrix. That is, when the raised structure is manufactured, there is no influence of the black matrix pattern around it, and the slope angle morphology around the raised structure can be better controlled, which is beneficial to improving light extraction efficiency, thereby reducing L-decay of the touch display panel and reducing color shift and other problems.

[0160] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0161] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of the embodiments of this disclosure. Therefore, if these modifications and variations to the embodiments of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.

Claims

1. A touch display panel, wherein, The display panel comprises a display area comprising a plurality of sub-pixel areas and a plurality of spacing areas spacing the plurality of sub-pixel areas from each other; a touch layer located on the light-out side of the display panel, the touch layer comprising a touch electrode located on the display area and arranged around the sub-pixel area; a first refractive index layer located on the side of the touch layer away from the display panel, the first refractive index layer comprising a protruding structure located in each of the sub-pixel areas and a first structure located in the spacing area, the first structure covering the touch electrode; a black matrix located on the side of the first structure away from the display panel, the orthographic projection of the black matrix on the display panel covering the orthographic projection of the touch electrode on the display panel; and a second refractive index layer located on the side of the black matrix away from the display panel, the second refractive index layer covering at least the top surface of the protruding structure away from the display panel and the side surface connected to the top surface, the refractive index of the first refractive index layer being greater than the refractive index of the second refractive index layer. The orthographic projection of the black matrix on the display panel covers the orthographic projection of the top surface of the first structure away from the display panel on the display panel. The orthographic projection of the black matrix on the display panel further covers the orthographic projection of the side surface connected to the top surface of the first structure on the display panel. The cross section of the protruding structure is a right trapezoid. The cross section of the first structure is a right trapezoid, the first structure is arranged spaced apart from the protruding structure, and the thickness of the first structure is the same as the thickness of the protruding structure. The first refractive index layer further comprises a second structure located in each of the sub-pixel areas and between the protruding structure and the touch layer, the thickness of the second structure is the same as the thickness of the first structure, and the protruding structure, the second structure and the first structure are an integral structure. 2.The touch display panel of claim 1, wherein, The orthographic projection of the second refractive index layer on the display panel covers the display area of the display panel. 3.The touch display panel of claim 2, wherein, Further comprising a filter layer located on the side of the second refractive index layer away from the display panel, the filter layer comprising a color filter structure arranged one-to-one corresponding to the sub-pixel area. 4.The touch display panel of any one of claims 1-3, wherein, The refractive index of the first refractive index layer is greater than 1.8, and the refractive index of the second refractive index layer is 1.4-1.

5. 5.The touch display panel of claim 4, wherein, The second refractive index layer comprises a color filter structure arranged one-to-one corresponding to the sub-pixel area, and the color filter structure covers the top surface of the protruding structure away from the display panel and the side surface connected to the top surface. 6.The touch display panel of any one of claims 1-4, wherein, The refractive index of the first refractive index layer is greater than 1.8, and the refractive index of the second refractive index layer is 1.6-1.

7. 7.The touch display panel of any one of claims 1-6, wherein, The black matrix surrounds a plurality of first openings corresponding to the sub-pixel areas, and each of the color filter structures is located in the corresponding first opening area. 8.The touch display panel of claim 7, wherein, Adjacent color filter structures are arranged in contact, and the orthographic projection of the contact boundary of adjacent color filter structures on the display panel is located in the orthographic projection of the black matrix on the display panel. 9.The touch display panel of claim 8, wherein, Further comprising a touch protection layer located on the side of the color filter structure away from the display panel. 10.The touch display panel of any one of claims 1-6, wherein, ​ 11.The touch display panel of claim 10, wherein, ​ 12.The touch display panel of any one of claims 8-11, wherein, ​ 13.The touch display panel of any one of claims 8-12, wherein, ​ 14.The touch display panel of any one of claims 8-13, wherein, ​ 15.The touch display panel of any one of claims 1-14, wherein, The display panel further comprises a non-display area surrounding the display area, the non-display area comprises at least one barrier wall arranged around the display area, the first refractive index layer is located at an edge of the non-display area and stops at a side of the barrier wall closest to the display area, and the black matrix is located at an edge of the non-display area and stops at a side of the barrier wall closest to the display area. 16.The touch display panel of claim 15, wherein, The black matrix is located at an edge of the non-display area and is substantially flush with an edge of the first refractive index layer. 17.The touch display panel of any one of claims 1-16, wherein, The display panel comprises a driving back plate and a pixel definition layer between the driving back plate and the touch layer; the pixel definition layer comprises a plurality of second openings corresponding to the sub-pixel areas; A projection boundary of the protruding structure on the display panel is located within a projection of the pixel definition layer on the display panel. 18.The touch display panel of claim 17, wherein, A distance between the projection boundary of the protruding structure on the display panel and a projection boundary of an inner wall of the second opening on the display panel is 1-2 μm. 19.The touch display panel of claim 17, wherein, The display panel further comprises a light-emitting functional layer between the pixel definition layer and the touch layer, and an encapsulation layer between the light-emitting functional layer and the touch layer; The light-emitting functional layer comprises a plurality of light-emitting units, the light-emitting units are located within the second openings, and the light-emitting units correspond to the second openings one by one. 20.The touch display panel of any one of claims 1-19, wherein, The touch layer comprises a touch buffer layer, a first metal layer, a touch insulating layer and a second metal layer arranged in layers, and the touch buffer layer is close to the display panel; The second metal layer comprises the touch electrodes, the touch electrodes comprise a plurality of first touch electrodes arranged along a first direction and a plurality of second touch electrodes arranged along a second direction, and the first direction intersects the second direction; The first touch electrodes comprise a plurality of first electrode blocks arranged along the second direction, and two adjacent first electrode blocks are electrically connected by a first connecting part; the second touch electrodes comprise a plurality of second electrode blocks arranged along the first direction, and two adjacent second electrode blocks are electrically connected by a second connecting part; The first connecting part is located in the second metal layer, and the second connecting part is located in the first metal layer; The first electrode blocks, the second electrode blocks, the first connecting part and the second connecting part are respectively grid-shaped structures arranged around the sub-pixel areas.

21. A display device, wherein, The touch display panel comprises the touch display panel according to any one of claims 1-20. 22.A manufacturing method of a touch display panel, comprising: The touch display panel comprises: forming a display panel, the display panel comprising a display area, the display area comprising a plurality of sub-pixel areas and a spacing area spacing the plurality of sub-pixel areas from each other; forming a touch layer on a light-emitting side of the display panel, the touch layer comprising a touch electrode located in the display area and arranged around the sub-pixel areas; forming a first refractive index layer on a side of the touch layer away from the display panel, the first refractive index layer comprising a protruding structure located in each of the sub-pixel areas and a first structure located in the spacing area, the first structure covering the touch electrode; A black matrix is formed on a side of the first structure facing away from the display panel, a projection of the black matrix on the display panel covers a projection of the touch electrode on the display panel; A second refractive index layer is formed on a side of the black matrix facing away from the display panel, the second refractive index layer covers at least a top surface of the protruding structure facing away from the display panel and a side surface connected to the top surface, a refractive index of the first refractive index layer is greater than a refractive index of the second refractive index layer.

23. The production method according to claim 22, wherein The first refractive index layer is formed, specifically comprising: A first refractive index material film layer is formed on a side of the touch layer facing away from the display panel; A photoresist layer is formed on a side of the first refractive index material film layer facing away from the display panel; A first photoresist pattern including a photoresist completely reserved area, a photoresist semi-reserved area and a photoresist completely removed area is formed by performing a half-tone mask process on the photoresist layer, the photoresist completely reserved area corresponds to at least the sub-pixel area, the photoresist semi-reserved area corresponds to at least the interval area, and the photoresist completely removed area corresponds to at least a region where a barrier of the non-display area is located; The first refractive index material film layer is etched with the first photoresist pattern as a mask, and the first refractive index material film layer above the region where the barrier is located is removed; The first photoresist pattern is ashed to remove the photoresist in the photoresist semi-reserved area and thin the photoresist in the photoresist completely reserved area, forming a second photoresist pattern; The first refractive index material film layer corresponding to the photoresist semi-reserved area is etched with the second photoresist pattern as a mask, forming the protruding structure in the sub-pixel area, the second structure in the sub-pixel area and between the protruding structure and the touch layer, and the first structure in the interval area, the protruding structure, the second structure and the first structure being an integrated structure; The second photoresist pattern is removed.

Images