Display panel and preparation method therefor, and touch-control display apparatus

Abstract

Provided in the present disclosure are a display panel and a preparation method therefor, and a touch-control display apparatus. The display panel comprises: a display substrate (10), a color filter layer (13) and a plurality of tactile sensing units (20). The display substrate (10) comprises a base substrate and a plurality of pixel units. The color filter layer (13) comprises a plurality of color filter units (131), wherein an opening region (132) is formed between adjacent color filter units (131). The plurality of tactile sensing units (20) are disposed in the opening regions (132) between the color filter units (131). In addition, the tactile sensing units (20) each comprise a black light-shielding material, and orthographic projections of the black light-shielding materials on the base substrate cover the opening regions (132) between the color filter units (131).

Description

Display panel and manufacturing method thereof, touch display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application No. 202310673654.X filed on June 7, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of display technology, and more particularly to a display panel and a method for manufacturing the same, and a touch display device. Background Art

[0004] In recent years, with the increasing maturity of COE (Color Filter On Encapsulation) technology in flexible OLED (Organic Light Emitting Diode, OLED), adopting COE technology instead of polarizers (POL) has become a trend in subsequent display screen iterations. COE technology can improve the light transmittance of the display device, thereby reducing the power consumption of the display screen and improving the battery life of mobile terminal products. However, for display devices with in-screen touch structures, COE structures bring some problems compared to POL, such as more severe brightness decay (L_decay) with viewing angle.

[0005] Summary of the Invention

[0006] An object of some embodiments of the present disclosure is to provide a display panel and a method for manufacturing the same, and a touch display device, so as to improve the problem of rapid brightness decay of a COE screen under viewing angle.

[0007] In the first aspect, some embodiments of the present disclosure also provide a display panel, comprising: a display substrate, the display substrate comprising a base substrate and a plurality of pixel units arranged on the base substrate, each pixel unit comprising a plurality of sub-pixels; a color film layer arranged on the display substrate, the color film layer comprising a plurality of color film units, and an opening area between adjacent color film units; a plurality of tactile sensing units, the tactile sensing units being arranged in the opening area, the tactile sensing units comprising a black shading material, the orthographic projection of the black shading material on the base substrate covering the opening area.

[0008] In some embodiments, the tactile sensing unit includes: a first electrode layer, a second electrode layer, and an electrolyte layer located between the first electrode layer and the second electrode layer, at least one of the first electrode layer, the second electrode layer, and the electrolyte layer includes the black light-shielding material; the interface between the first electrode layer and the electrolyte layer is a first interface, and the interface between the second electrode layer and the electrolyte layer is a second interface, the first electrode layer is connected to a first voltage signal, and the second electrode layer is connected to a second voltage signal, and there is a voltage difference between the first voltage signal and the second voltage signal, so that interface capacitance is formed at the first interface and the second interface respectively, and the interface capacitance at the first interface and / or the second interface changes in response to the touch operation performed by the user, and recovers after the touch operation ends.

[0009] In some embodiments, at least one of the first electrode layer, the second electrode layer, and the electrolyte layer has a gap. When a user performs a touch operation, the gap at the corresponding position is compressed, the effective contact area of ​​the first interface and / or the second interface increases, and the interface capacitance increases.

[0010] In some embodiments, the first electrode layer and the second electrode layer include: a composite film layer of polymer fibers and conductive nanomaterials, wherein the conductive nanomaterials are: black conductive nanomaterials; the electrolyte layer includes: a composite fiber of elastic polymer material and electrolyte material.

[0011] In some embodiments, the material of the polymer fiber includes: one or more of thermoplastic polyurethane, polypropylene, polyvinylidene fluoride, polyethylene and nylon; the conductive nanomaterial is: carbon fiber, carbon nanotube or graphene; the elastic polymer material includes: one or more of thermoplastic polyurethane, polyethylene and nylon; the electrolyte material includes: one or more of 1-hexyl-3-methylimidazole tetrafluoroborate, 1-butyl-3-methylimidazole tetrafluoroborate and tert-butyl peroxyacetate.

[0012] In some embodiments, the first electrode layers of adjacent tactile sensing units are separated, and the second electrode layers of the tactile sensing units are connected to each other.

[0013] In some embodiments, the above-mentioned display panel also includes: a ground signal line and a touch signal line corresponding to each of the tactile sensing units, the first electrode layer of the tactile sensing unit is connected to the corresponding touch signal line, the touch signal line is configured to transmit the touch signal of the corresponding tactile sensing unit, and the second electrode layer of the tactile sensing unit is connected to the ground signal line.

[0014] In some embodiments, the first electrode layer is closer to the display substrate than the second electrode layer, and the display panel further includes: a conductive pattern layer arranged on a side of the first electrode layer close to the display substrate, and the touch signal line is arranged in the conductive pattern layer.

[0015] In some embodiments, the conductive pattern layer is made of a transparent conductive material.

[0016] In some embodiments, the first electrode layer is closer to the display substrate than the second electrode layer, and the display substrate includes: a light-emitting device layer arranged on the base substrate, the light-emitting device layer including a plurality of light-emitting devices for constituting the plurality of pixel units; a metal routing layer is arranged between the base substrate and the light-emitting device layer, the touch signal line is arranged in the metal routing layer, and the first electrode layer of the tactile sensing unit is connected to the touch signal line through a via.

[0017] In some embodiments, the light-emitting device layer includes a pixel defining layer, the pixel defining layer has a pixel opening, and the light-emitting device is arranged at the pixel opening; along a direction perpendicular to the substrate, the insulating layer between the first electrode layer and the pixel defining layer, the pixel defining layer, and the insulating layer between the pixel defining layer and the metal wiring layer are provided with through holes that are connected in sequence, and a connecting portion is provided in the through hole, and the first electrode layer of the tactile sensing unit is connected to the corresponding touch signal line in the metal wiring layer through the connecting portion.

[0018] In some embodiments, the above-mentioned display panel also includes a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer; the display substrate includes: a light-emitting device layer arranged on the base substrate, the first inorganic encapsulation layer is arranged on a side of the light-emitting device layer close to the color film layer and the tactile sensing unit, and the organic encapsulation layer and the second inorganic encapsulation layer are stacked in sequence on a side of the color film layer and the tactile sensing unit away from the light-emitting device layer.

[0019] In the second aspect, some embodiments of the present disclosure also provide a method for preparing a display panel, the method comprising: providing a display substrate, the display substrate comprising a base substrate and a plurality of pixel units arranged on the base substrate, each pixel unit comprising a plurality of sub-pixels; forming a color filter layer on the display substrate, the color filter layer comprising a plurality of color filter units, and an opening area between adjacent color filter units; forming a plurality of tactile sensing units in the opening area in the color filter layer, the tactile sensing units comprising a black shading material, the orthographic projection of the black shading material on the base substrate covering the opening area.

[0020] In some embodiments, a plurality of tactile sensing units are formed in the opening area in the color film layer, including: forming a first electrode layer of each tactile sensing unit in the opening area, and separating the first electrode layers of adjacent tactile sensing units; forming an electrolyte layer on the first electrode layer in the opening area; and forming a second electrode layer on the electrolyte layer in the opening area.

[0021] In a third aspect, some embodiments of the present disclosure further provide a display device, comprising: the display panel provided in the first aspect above.

[0022] The above description is only an overview of the technical solutions provided by some embodiments of the present disclosure. In order to more clearly understand the technical means of some embodiments of the present disclosure, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of some embodiments of the present disclosure more obvious and easy to understand, the specific implementation methods of some embodiments of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0024] FIG1 is a schematic structural diagram of a display panel in some embodiments of the present disclosure;

[0025] FIG2 is a schematic diagram of the arrangement of tactile sensing units in some embodiments of the present disclosure;

[0026] FIG3 is a schematic diagram of the arrangement of a tactile sensing unit in some embodiments of the present disclosure;

[0027] FIG4 is a schematic structural diagram of a display panel in a comparative embodiment;

[0028] FIG5 is a schematic diagram of a state of a tactile sensing unit in the first stage in some embodiments of the present disclosure;

[0029] FIG6 is a schematic diagram of a state of a tactile sensing unit in the second stage in some embodiments of the present disclosure;

[0030] FIG7 is an equivalent circuit diagram of a tactile sensing unit in some embodiments of the present disclosure;

[0031] FIG8 is a schematic diagram showing the arrangement of the first electrode layers of each tactile sensing unit in some embodiments of the present disclosure;

[0032] FIG9 is a schematic structural diagram of a display panel in some other embodiments of the present disclosure;

[0033] FIG10 is a flow chart of a method for preparing a display panel in some embodiments of the present disclosure;

[0034] 11a to 11h are schematic diagrams of a first exemplary process flow for displaying a panel in some embodiments of the present disclosure;

[0035] 12a-12h are schematic diagrams of a second exemplary process flow for displaying a panel in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0036] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0037] It should be noted that the term "and / or" used herein merely describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The term "plurality" used herein includes two or more than two.

[0038] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0039] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0040] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0041] In a first aspect, some embodiments of the present disclosure provide a display panel. Referring to Figures 1-3 , the display panel includes a display substrate 10, a color filter layer 13 disposed on the display substrate 10, and multiple tactile sensing units 20. The display substrate 10 includes a base substrate and multiple pixel units disposed on the base substrate, each pixel unit including multiple sub-pixels.

[0042] For example, the substrate may be a rigid substrate, which may include a glass substrate, a PMMA (Polymethyl methacrylate) substrate, a silicon substrate, etc. In this case, the display panel may be a rigid display panel.

[0043] For another example, the substrate may be a rigid substrate. Alternatively, it may be a flexible substrate. The flexible substrate may include, for example, a PET (Polyethylene terephthalate) substrate, a PEN (Polyethylene naphthalate diformic acid glycol ester) substrate, or a PI (Polyimide) substrate. In this case, the display panel may be a flexible display panel.

[0044] It should be noted that the base substrate may be a single-layer structure or a multi-layer structure. For example, the base substrate may include at least one flexible substrate and at least one buffer layer, and the flexible substrate and the buffer layer are alternately stacked.

[0045] For example, the plurality of pixel units are arranged in an array in a first direction and a second direction. That is, the plurality of pixel units are arranged in M ​​rows and N columns, where M and N are integers greater than or equal to 2. The first direction is the pixel row direction, and the second direction is the pixel column direction. The first direction and the second direction intersect, such as being perpendicular to each other.

[0046] Each pixel unit consists of multiple sub-pixels, each of which can display a single color, such as a red sub-pixel displaying red, a green sub-pixel displaying green, and a blue sub-pixel displaying blue. The brightness (grayscale) of the different colored sub-pixels in each pixel can be adjusted, and by combining and superimposing colors, multiple colors can be displayed, thus achieving full-color display on the display panel.

[0047] Each sub-pixel may include a light-emitting device 101 and a pixel driving circuit for driving the light-emitting device 101. For example, the light-emitting device 101 may be an organic light-emitting diode, a micro organic light-emitting diode (Micro OLED), a quantum dot organic light-emitting diode (Quantum Dot Light Emitting Diode, QLED), etc. For example, a red sub-pixel may include a light-emitting device 101 for emitting red light, a green sub-pixel may include a light-emitting device 101 for emitting green light, and a blue sub-pixel may include a light-emitting device 101 for emitting red light.

[0048] The pixel driving circuit may include multiple electronic components such as transistors and capacitors. For example, each pixel driving circuit may include three transistors and one capacitor, forming a 3T1C (i.e., one driving transistor, two switching transistors and one capacitor). It may also include more than three transistors and at least one capacitor, such as a 4T1C (i.e., one driving transistor, three switching transistors and one capacitor), a 5T1C (i.e., one driving transistor, four switching transistors and one capacitor), or a 7T1C (i.e., one driving transistor, six switching transistors and one capacitor). Among them, the transistor may be a thin film transistor (TFT), a metal oxide semiconductor (MOS), or other switching devices with the same characteristics.

[0049] It is understood that a transistor may include a control electrode, a first electrode, and a second electrode. The control electrode is the gate of the transistor, the first electrode is one of the source and drain of the transistor, and the second electrode is the other of the source and drain of the transistor. Since the source and drain of a transistor may be structurally symmetrical, their structures may be identical, and the source of the transistor may be referred to as the first electrode, or may also be referred to as the second electrode.

[0050] FIG1 shows a schematic diagram of the stacking relationship of multiple layers included in the display panel provided by some embodiments of the present disclosure. As shown in FIG1 , the display substrate 10 includes: a backplane layer 100 (BP Layer) and a light-emitting device layer. The backplane layer 100 includes the above-mentioned base substrate and a pixel driving circuit layer provided on the base substrate. The pixel driving circuit layer includes a plurality of pixel driving circuits arrayed in a first direction and a second direction. The light-emitting device layer is used to form a light-emitting device 101 for each sub-pixel. The light-emitting device layer and the pixel driving circuit layer together constitute a plurality of pixel units provided on the base substrate.

[0051] For example, the pixel driving circuit layer may include an active layer, a first gate metal layer (Gate1), a second gate metal layer (Gate2), a first metal wiring layer (SD1) and a second metal wiring layer (SD2). These functional layers are configured to form transistors, capacitors and multiple signal lines for pixel driving in the pixel driving circuit. For example, the multiple signal lines may include: power signal lines, data signal lines, reset signal lines, scan signal lines, enable signal lines and initialization signal lines, etc. For details, please refer to the relevant technology and will not be described in detail here. The pixel driving circuit layer may also include an insulating layer that separates these functional layers. It should be noted that the functional layers of the pixel driving circuit layer listed above are only for illustration. In other examples, the pixel driving circuit layer may also include more or fewer functional layers, for example, more metal wiring layers, which are specifically set according to the needs of the actual product. This embodiment does not limit this.

[0052] As shown in Figure 1, the light-emitting device layer may include a pixel-defining layer 102 and a plurality of light-emitting devices 101. The pixel-defining layer 102 has a plurality of pixel openings, each of which defines the position of a light-emitting device 101. For example, the pixel-defining layer 102 may be made of a black light-shielding material to absorb incident ambient light, reduce the ambient light reflectivity of the display panel, and minimize crosstalk between adjacent sub-pixels.

[0053] For example, in a direction away from the substrate, the light-emitting device 101 may include an anode, a light-emitting layer, and a cathode stacked in sequence. Of course, the light-emitting device layer may also include at least one of a hole injection layer, a hole transport layer, and an electron blocking layer disposed between the anode and the light-emitting layer, and at least one of an electron injection layer, an electron transport layer, and a hole blocking layer disposed between the cathode and the light-emitting layer. The specific configuration is based on actual needs and is not limited in this embodiment.

[0054] For example, the anode structure may be a composite structure composed of a transparent conductive oxide film / metal film / transparent conductive oxide film stacked in sequence. The transparent conductive oxide film may be made of, for example, ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide), and the metal film may be made of, for example, gold (Au), silver (Ag), nickel (Ni), and platinum (Pt). For another example, the anode structure may be a single-layer structure, and the single-layer structure may be made of, for example, ITO, IZO, Au, Ag, Ni, or Pt.

[0055] Each pixel opening exposes a portion of the anode of the corresponding light-emitting device 101 , and at least a portion of the light-emitting layer is located within the corresponding pixel opening and is electrically connected to the corresponding anode.

[0056] For example, the cathodes of the light emitting devices 101 may be electrically connected to each other to form an integrated structure. For example, the cathode material may be any one of aluminum (Al), silver (Ag), and magnesium (Mg), or any one of a magnesium-silver alloy and an aluminum-lithium alloy.

[0057] In order to protect the light emitting device 101, the display panel further includes an encapsulation layer disposed on a side of the light emitting device layer away from the base substrate to protect the light emitting device 101. The color filter layer 13 is disposed on a side of the encapsulation layer away from the base substrate.

[0058] In some examples, the display panel may include a first inorganic encapsulation layer 111, an organic encapsulation layer 112, and a second inorganic encapsulation layer 113. As shown in FIG1 , as an embodiment, the first inorganic encapsulation layer 111 is disposed on a side of the light-emitting device layer close to the color filter layer 13 and the tactile sensing unit 20, that is, between the color filter layer 13 and the light-emitting device layer, while the organic encapsulation layer 112 and the second inorganic encapsulation layer 113 can be sequentially stacked on a side of the color filter layer 13 and the tactile sensing unit 20 away from the light-emitting device layer. This is equivalent to arranging the color filter layer 13 and the tactile sensing unit 20 in the encapsulation layer of the light-emitting device layer. On the one hand, it is beneficial to reduce the distance between the color filter unit 131 and the light-emitting device 101 in the direction perpendicular to the substrate, thereby improving the viewing angle brightness attenuation (L_decay) problem. On the other hand, it can also achieve encapsulation protection for the color filter unit 131 and the tactile sensing unit 20.

[0059] Of course, in other examples, the first inorganic encapsulation layer 111 , the organic encapsulation layer 112 and the second inorganic encapsulation layer 113 may all be arranged between the color filter layer 13 and the light-emitting device layer, depending on actual needs, and this embodiment does not limit this.

[0060] The color filter layer 13 may include a plurality of color filter units 131. Each color filter unit 131 corresponds to at least one sub-pixel, for example, a red sub-pixel corresponds to a red color filter unit 131R, a green sub-pixel corresponds to a green color filter unit 131G, and a blue sub-pixel corresponds to a blue color filter unit 131B.

[0061] There is an opening area 132 between adjacent color film units 131, and the above-mentioned multiple tactile sensing units 20 are arranged in the opening area 132. The touch function of the display panel can be realized by multiple tactile sensing units 20. For example, Figure 2 shows an exemplary arrangement diagram of the tactile sensing units 20, and each small solid box in Figure 2 represents a tactile sensing unit 20. As shown in Figure 2, the above-mentioned multiple tactile sensing units 20 can be distributed in an array on the display substrate 10. It should be noted that the number, shape and arrangement of the tactile sensing units 20 shown in Figure 2 are only for illustration and not for limitation. The specific configuration needs to be based on actual needs. By pre-storing the position information of each tactile sensing unit 20 on the screen and processing the touch signal of each tactile sensing unit 20 separately, the change in the capacitance value of each tactile sensing unit 20 can be detected, thereby determining whether a touch operation occurs on the screen and the position where the touch operation occurs.

[0062] For example, each tactile sensing unit 20 may correspond to a×b sub-pixels, where a and b are both integers greater than or equal to 1 and can be set based on the actual touch accuracy requirements. Figure 3 shows a top view of a single tactile sensing unit 20 in Figure 2, taking each tactile sensing unit 20 corresponding to 4×4 sub-pixels as an example. As shown in Figure 3, the tactile sensing units 20 are arranged in a grid-like structure within the openings 132 between the 4×4 color filter units 131 corresponding to these 4×4 sub-pixels.

[0063] The tactile sensing unit 20 includes a black light-shielding material, the orthographic projection of which on the substrate covers the openings 132 between the color filter units 131. For example, the orthographic projection of the upper end of the openings 132 between the color filter units 131 on the substrate lies within the orthographic projection of the black light-shielding material distribution area on the substrate. In other words, in addition to implementing touch control, the tactile sensing unit 20 can also replace the traditional black matrix as a light-shielding structure to absorb ambient light, allowing the display panel to appear dark when the screen is off.

[0064] FIG4 shows a schematic structural diagram of a COE display panel provided in a comparative embodiment. As shown in FIG4 , the display panel includes, from bottom to top: a backplane layer 410, a light-emitting device layer 420, an encapsulation layer 430, a touch structure layer 440, a color filter layer 450, a black matrix 460, and a cover plate 470. The encapsulation layer 430 includes: a first inorganic encapsulation layer 431, an organic encapsulation layer 432, and a second inorganic encapsulation layer 433. The touch structure layer 440 includes: a first inorganic insulating layer 441 (such as silicon nitride), a first touch metal layer 442, a second inorganic insulating layer 443 (such as silicon nitride), a first touch metal layer 444, and an organic layer 445, which are stacked in sequence. In this structure, the touch structure layer 440 is disposed between the encapsulation layer 430 and the color filter layer 450. This results in the color filter layer 450 being relatively far from the light-emitting device in a direction perpendicular to the substrate. This causes the black matrix 460 to block light from the light-emitting device 101, affecting the light emission path from side angles and causing a worsening of the viewing angle brightness decay (L_decay), which affects the user experience. Furthermore, the reflectivity is high in the dark state, making the process complex.

[0065] Compared to the comparative embodiment, the display panel provided in this embodiment eliminates the traditional touch structure layer 440 and the black matrix 460 between the color filter units 131. Instead, multiple tactile sensing units 20 are provided in the opening area 132 between the color filter units 131 to achieve touch and light-shielding functions. On the one hand, this can reduce the distance between the color filter layer 13 and the light-emitting device 101 in a direction perpendicular to the substrate, thereby reducing the absorption of the wide-angle light emitted by the light-emitting device 101 by the black light-shielding material contained in the tactile sensing unit 20, which helps to improve the problem of rapid brightness decay at viewing angles in traditional touch products based on COE technology. On the other hand, it can also reduce the thickness of the display panel, for example, by 1 to 5 μm, which facilitates folding. The thinner the screen, the less stress is generated at the fold.

[0066] As shown in FIG1 , in some examples, the tactile sensing unit 20 may include: a first electrode layer 201, a second electrode layer 202, and an electrolyte layer 210 located between the first electrode layer 201 and the second electrode layer 202. In a specific implementation, the first electrode layer 201 is connected to a first voltage signal, and the second electrode layer 202 is connected to a second voltage signal. There is a voltage difference between the first voltage signal and the second voltage signal, that is, one of the first electrode layer 201 and the second electrode layer 202 is positively charged and the other is negatively charged. The first voltage signal and the second voltage signal can be connected according to the actual application scenario. For example, one of them can be a positive voltage signal and the other can be a zero voltage signal or a negative voltage signal.

[0067] To facilitate wiring, in some examples, one of the first electrode layer 201 and the second electrode layer 202 can be grounded, and the other can be connected to the signal input terminal of the capacitance detection circuit. Since the voltage of the signal input terminal is positive, the grounded electrode layer is negatively charged, and the electrode layer connected to the signal input terminal is positively charged.

[0068] The interface between the first electrode layer 201 and the electrolyte layer 210 is the first interface 221, and the interface between the second electrode layer 202 and the electrolyte layer 210 is the second interface 222. The electrolyte layer 210 contains positively charged ions and negatively charged ions. When one of the first electrode layer 201 and the second electrode layer 202 is positively charged and the other is negatively charged, the positive and negative charges in the electrolyte layer 210 are attracted to the first interface 221 and the second interface 222 respectively by the Coulomb force, forming interface capacitance at the first interface 221 and the second interface 222 respectively, that is, forming a double layer capacitance, which can provide a specific capacitance with an ultra-high capacitance value. The interface capacitance at the first interface 221 and / or the second interface 222 can change in response to the touch operation performed by the user, that is, the total capacitance value of the tactile sensing unit 20 will also change, and will recover after the touch operation ends. The capacitance detection circuit can detect the capacitance change of the tactile sensing unit 20 at the corresponding position, thereby realizing the touch function.

[0069] As shown in Figure 5, taking the example of the second electrode layer 202 being grounded and the first electrode layer 201 being connected to the capacitance detection circuit, the first electrode layer 201 is positively charged and the second electrode layer 202 is negatively charged. The negative charges in the electrolyte layer 210 are attracted by the Coulomb force and arranged at the first interface 221, forming an interface capacitor, while the positive charges are attracted by the Coulomb force and arranged at the second interface 222, forming an interface capacitor, that is, forming an electric double layer (EDL) capacitor.

[0070] In some examples, at least one of the first electrode layer 201, the second electrode layer 202, and the electrolyte layer 210 has a gap. When a user performs a touch operation, pressure perpendicular to the substrate compresses the gap at the corresponding location, increasing the effective contact area of ​​the first interface 221 and / or the second interface 222, and increasing the interface capacitance. After the touch operation ends, the first electrode layer 201, the second electrode layer 202, and the electrolyte layer 210 recover from the compressed state, and the interface capacitance returns to its pre-compression value.

[0071] Taking the example of the first electrode layer 201, the second electrode layer 202 and the electrolyte layer 210 all having gaps inside, the touch process and principle of the display panel can be divided into two stages: the first stage is the original state of the screen, and the second stage is the stage when the finger touches the screen and the pressure increases.

[0072] Stage 1: As shown in Figure 5, the screen is not subjected to external forces. Due to the presence of the gap, the direct contact area (i.e., effective contact area) between the first electrode layer 201 and the second electrode layer 202 and the electrolyte layer 210 is small. This loose contact causes a small number of charge pairs to be attracted and arranged at the first interface 221 and the second interface 222 by the Coulomb force. At this time, the capacitance value is relatively low. For ease of distinction, the capacitance value of the tactile sensor unit 20 in the first stage is referred to as the initial capacitance value.

[0073] Phase 2: As shown in Figure 6, a finger touches the screen and the pressure F increases. The gaps within the first electrode layer 201, the second electrode layer 202, and the electrolyte layer 210 are compressed, and the distance between the first electrode layer 201 and the second electrode layer 202 is reduced. The effective contact area at the first interface 221 and the second interface 222 increases, enhancing the electric field and promoting the migration of more charge pairs to the first interface 221 and the second interface 222, thereby obtaining a higher measured capacitance. The double-layer capacitor formed by the ionization effect has a higher capacitance value, which is at least three orders of magnitude larger than the traditional parallel plate capacitance touch sensor based on static charge, which is conducive to improving touch detection accuracy.

[0074] It should be noted that, when the second stage ends, that is, after the finger leaves the screen, as the compressed gap is restored, the tactile sensing unit 20 returns to the initial capacitance value of the first stage.

[0075] Figure 7 shows an equivalent circuit diagram of the tactile sensing unit 20. In Figure 7, the interface capacitance formed at the first interface 221 in Figures 5 and 6 is represented as an equivalent capacitance Cb, the interface capacitance formed at the second interface 222 is represented as an equivalent capacitance Ct, and the resistance of the electrolyte layer 210 is represented as an equivalent resistance R. As shown in Figure 7, the first end of the equivalent capacitor Ct is grounded, the second end of the equivalent capacitor Ct, the equivalent resistance R, and the first end of the equivalent capacitor Cb are connected in series, and the second end of the equivalent capacitor Cb is used to connect to the capacitance detection circuit. For example, the voltage of the connection end can be represented as +V. When the capacitance value of the capacitor Ct and / or the capacitor Cb changes, the total capacitance value Ctotal of the tactile sensing unit 20 will also change, thereby realizing touch detection.

[0076] To minimize the number of film layers and simplify the process, when selecting the materials for each film layer, at least one of the first electrode layer 201, the second electrode layer 202, and the electrolyte layer 210 can include a black light-shielding material to provide a light-shielding function. The orthographic projection of the black light-shielding material on the base substrate covers the opening area 132 between the color filter units 131. For example, both the first electrode layer 201 and the second electrode layer 202 can include a black light-shielding material to achieve a good light-shielding effect and reduce the ambient light reflectivity in the dark state.

[0077] In some examples, the first electrode layer 201 and the second electrode layer 202 may include: a composite film layer of polymer fibers and conductive nanomaterials. In an optional embodiment, the conductive nanomaterials can be randomly distributed on the polymer fibers to form a conductive network structure. The polymer fibers have a large porosity and good resilience, which is conducive to increasing the capacitance change when the user touches and recovering when the touch ends. For example, the polymer material may include one or more of thermoplastic polyurethane (TPU), polypropylene (PP), polyvinylidene fluoride (PVDF), polyethylene, and nylon.

[0078] There are many types of conductive nanomaterials. In one optional embodiment, to achieve a light-shielding function for both the first electrode layer 201 and the second electrode layer 202, the conductive nanomaterial can be a black conductive nanomaterial, such as carbon fiber, carbon nanotubes, or graphene. The black conductive nanomaterial is distributed on the polymer fibers, giving the first electrode layer 201 and the second electrode layer 202 a black porous structure. When the screen is off, the black material can absorb ambient light. On the other hand, the external ambient light can be reflected multiple times within the internal fiber structure, thereby being consumed, reducing the reflectivity of the screen when the screen is off.

[0079] In some examples, the electrolyte layer 210 may include: a composite fiber of a polymer material and an electrolyte material. For example, in order to increase the compressibility of the electrolyte layer 210 and further reduce the distance between the first electrode layer 201 and the second electrode layer 202 in the second stage, the polymer material in the electrolyte layer 210 may be an elastic polymer material. For example, the elastic polymer material used may include but is not limited to any one or more of thermoplastic polyurethane (TPU), polyethylene, and nylon. It should be noted that the polymer material used in the electrolyte layer 210 may be the same as the polymer material used in the first and second electrode layers 202, or may be different, and this embodiment does not limit this. For example, the electrolyte material includes: one or more of 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium tetrafluoroborate, and tert-butyl peroxyacetate.

[0080] For example, in some application scenarios, the first electrode layer 201 and the second electrode layer 202 can be composite film layers of TPU fibers and carbon fibers (or carbon nanotubes); the electrolyte layer 210 can be a composite fiber film layer of TPU and solid electrolyte.

[0081] Compared to the touch structure layer 440 including multiple touch metal layers and multiple inorganic insulating layers in the comparative embodiment shown in FIG4 , the tactile sensing unit 20 mainly uses organic materials, which is beneficial to improving the bending performance when applied to COE foldable products.

[0082] In order to detect the touch position information, the touch signals of the above-mentioned multiple tactile sensing units 20 need to be independently led out so as to detect the change in the capacitance value of each tactile sensing unit 20 respectively. The first electrode layers 201 of adjacent tactile sensing units 20 are separated so that the first electrode layers 201 of different tactile sensing units 20 are insulated from each other, presenting a plurality of independent grid structures. For example, assuming that m×n tactile sensing units 20 are arranged in the display panel, m×n first electrode layers 201 of the grid structure need to be arranged accordingly. FIG8 takes the 2×2 tactile sensing units 20 surrounded by the dotted box in FIG2 as an example to show a schematic diagram of the arrangement of the first electrode layers 201 of each tactile sensing unit 20. As shown in FIG8, the first electrode layers 201a, 201b, 201c, and 201d of the four tactile sensing units 20 are separated and insulated from each other.

[0083] To simplify the process, in some examples, the second electrode layers 202 of each tactile sensing unit 20 can be interconnected to form an integrated grid structure; the electrolyte layers 210 of each tactile sensing unit 20 can also be interconnected to form an integrated grid structure.

[0084] Of course, in addition to the above-mentioned double-layer capacitor structure, the tactile sensing unit 20 can also adopt other tactile sensors that can be applied to the display panel. For example, the tactile sensing unit 20 can adopt a capacitive flexible tactile sensor. In this case, the tactile sensing unit 20 includes an upper and lower electrode and a flexible insulating medium sandwiched between the upper and lower electrodes. When an external force is pressed, the flexible insulating medium is compressed, the distance between the upper and lower electrodes is reduced, and the capacitance increases; when the external force is released, the flexible insulating medium itself has elasticity and can rebound to the starting position. The capacitance value of the capacitive flexible tactile sensor will also return to the initial value, so that the capacitance detection circuit can detect the capacitance change of the tactile sensing unit 20 at the corresponding position, thereby realizing the touch function. For another example, the tactile sensing unit 20 can also adopt a triboelectric tactile sensor. This embodiment does not limit this.

[0085] In some examples, the display panel further includes: a ground signal line and a touch signal line corresponding to each tactile sensing unit 20. The first electrode layer 201 is connected to the corresponding touch signal line, the touch signal line 240 is used to transmit the touch signal of the corresponding tactile sensing unit 20, and the second electrode layer 202 of the tactile sensing unit 20 is connected to the ground signal line. For example, the touch signal of the tactile sensing unit 20 can be led out to the border area of ​​the display panel through the touch signal line, and then routed from the border area to connect to the capacitance detection circuit. For example, the capacitance detection circuit can be set on a flexible printed circuit (FPC) and bound to the display panel.

[0086] There are many ways to arrange the touch signal line 240 . Hereinafter, taking the case where the first electrode layer 201 is closer to the display substrate 10 than the second electrode layer 202 as an example, two touch signal line arrangements are listed for illustration.

[0087] First, the touch signal lines 240 can be arranged on the side of the light-emitting device layer away from the base substrate. For example, the display panel further includes a conductive pattern layer 12 disposed on the side of the first electrode layer 201 near the display substrate 10, with the touch signal lines disposed within the conductive pattern layer 12. For example, as shown in Figure 1, the first inorganic encapsulation layer 111 and the conductive pattern layer 12 are sequentially stacked on the side of the light-emitting device layer away from the base substrate. This allows the touch signal lines to connect to the first electrode layer 201 of the corresponding tactile sensor unit 20 through contact, eliminating the need for additional vias.

[0088] For example, the conductive pattern layer 12 may be made of a transparent conductive material such as ITO to facilitate wiring and reduce the impact on display brightness.

[0089] Second, as shown in FIG9 , the touch signal lines 240 can be routed in a metal routing layer provided between the base substrate and the light-emitting device layer, i.e., the touch signal lines 240 can be provided in the backplane layer 100. The first electrode layer 201 of each tactile sensing unit 20 is connected to its respective touch signal line 240 via a via. For example, the touch signal lines 240 of each tactile sensing unit 20 can be routed in the first metal routing layer (SD1) of the pixel drive circuit layer; alternatively, an additional metal routing layer for routing the touch signal lines 240 can be provided in the backplane layer 100. The specific arrangement depends on actual needs and is not limited in this embodiment.

[0090] Taking the layout on the first metal wiring layer (SD1) as an example, along the direction perpendicular to the substrate, the insulating layer between the first electrode layer 201 and the pixel definition layer 102 (such as the first inorganic encapsulation layer 111 shown in Figure 9), the pixel definition layer 102, and the insulating layer between the pixel definition layer 102 and the first metal wiring layer (SD1) (such as a flat layer, etc.) can be provided with through holes that are connected in sequence. The through holes are provided with connecting portions 231. The first electrode layer 201 of the tactile sensing unit 20 is connected to the corresponding touch signal line 240 in the first metal wiring layer (SD1) through the connecting portions 231. The material of the connecting portion 231 is a conductive material, for example, it can be the same as the material of the first electrode layer 201, or it can be different.

[0091] In some embodiments, the display panel further includes a protective layer 14. For example, the material of the protective layer 14 may include: overcoat (OC), PET, ultra-thin glass (UTG), and colorless polyimide (CPI), etc. This embodiment does not limit this. For example, as shown in Figures 1 and 9, when the organic encapsulation layer 112 and the second inorganic encapsulation layer 113 are stacked in sequence on the side of the color filter layer 13 away from the base substrate, the protective layer 14 can be disposed on the side of the second inorganic encapsulation layer 113 away from the base substrate.

[0092] In a second aspect, some embodiments of the present disclosure further provide a method for manufacturing a display panel, for manufacturing the display panel provided in the first aspect above. As shown in FIG10 , the method may include the following steps:

[0093] Step S101, providing a display substrate, the display substrate comprising a base substrate and a plurality of pixel units arranged on the base substrate, each pixel unit comprising a plurality of sub-pixels;

[0094] Step S102, forming a color filter layer on the display substrate, wherein the color filter layer includes a plurality of color filter units, and an opening area is formed between adjacent color filter units;

[0095] Step S103 : forming a plurality of tactile sensing units in the opening area of ​​the color filter layer, wherein the tactile sensing units include a black light-shielding material, and an orthographic projection of the black light-shielding material on the base substrate covers the opening area.

[0096] In some examples, the step of forming multiple tactile sensing units 20 in the opening area 132 in the color filter layer 13 may include: forming a first electrode layer 201 for each tactile sensing unit 20 in the opening area 132 in the color filter layer 13, and separating the first electrode layers 201 of adjacent tactile sensing units 20; forming an electrolyte layer 210 on the first electrode layer 201 in the opening area 132; and forming a second electrode layer 202 on the electrolyte layer 210 in the opening area 132.

[0097] For ease of understanding, two exemplary manufacturing process flows of display panels are introduced below.

[0098] Referring to Figures 11a to 11h, a first exemplary preparation process may include the following steps (1) to (10).

[0099] Step (1): forming a light-emitting device layer on the backplane layer 100 to obtain a display substrate 10 including a plurality of pixel units.

[0100] Step (2): Form a first inorganic encapsulation layer 111 (CVD1) on the light-emitting device layer by a chemical vapor deposition process, as shown in FIG11 a. For example, the material of the first inorganic encapsulation layer 111 can be made of any one or more inorganic insulating materials such as nitride, oxide, oxynitride, nitrate, etc. For example, the thickness of the first inorganic encapsulation layer 111 can be 1 to 3 μm, such as 2 μm.

[0101] Step (3): Based on the pre-designed layout of the touch signal lines 240 for each tactile sensing unit 20, a conductive pattern layer 12 is formed on the first inorganic encapsulation layer 111 (CVD1), as shown in FIG11b . The conductive pattern layer 12 includes a touch signal line corresponding to each tactile sensing unit 20. For example, the conductive pattern layer 12 may be made of a transparent conductive material such as ITO, and the line width may be 2 to 4 μm, such as 2 μm.

[0102] Step (4): Prepare a color filter layer 13 on the conductive pattern layer 12, as shown in Figure 11c. For example, the color filter layer 13 may include: a red color filter unit 131 (R CF), a green color filter unit 131 (G CF), and a blue color filter unit 131 (B CF), each color filter unit 131 corresponding to a light-emitting device 101. There is an opening area 132 between adjacent color filter units 131. For example, the thickness of the color filter unit 131 can be 2 to 7 μm, and the horizontal distance d between the boundary of the color filter unit 131 and the same-side boundary of the light-emitting device 101 below is 2 to 7 μm. For example, when the thicknesses of the red color filter unit 131, the green color filter unit 131, and the blue color filter unit 131 are all 5 μm, the horizontal distance d between the boundary of the color filter unit 131 and the boundary of the light-emitting device 101 below on the same side can be 4 μm; when the thicknesses of the red color filter unit 131, the green color filter unit 131, and the blue color filter unit 131 are 3 μm, 3 μm, and 4 μm, respectively, the horizontal distance d between the boundary of the color filter unit 131 and the boundary of the light-emitting device 101 below can be 3 μm.

[0103] Step (5): The conductive nanomaterial and polymer material are dissolved in a chemical solvent and blended into a uniform mixture by ultrasonic vibration. A conductive nanomaterial / polymer fiber composite film is formed in the opening area 132 of the color filter layer 13 by electrospinning, thereby obtaining the first electrode layer 201 of each tactile sensor unit 20, as shown in FIG11d. The first electrode layer 201 of each tactile sensor unit 20 contacts at least a portion of the corresponding touch signal line in the conductive pattern layer 12, thereby achieving a connection between the first electrode layer 201 and the touch signal line 240.

[0104] The chemical solvent may include, but is not limited to, one or more combinations of dimethylformamide and tetrahydrofuran. The conductive nanomaterials are randomly distributed on the polymer fibers. The conductive nanomaterials have a high aspect ratio and good conductivity, forming a conductive network structure on the polymer fiber membrane.

[0105] The thickness of the composite film layer of polymer fibers and conductive nanomaterials can be 0.5 to 2 μm, for example, 1 μm. The polymer material can be one or more of polypropylene (PP), polyvinylidene fluoride (PVDF), thermoplastic polyurethane (TPU), polyethylene, and nylon. To make the first electrode layer 201 appear black, the conductive nanomaterial can be a black conductive nanomaterial such as carbon fiber, carbon nanotube, or graphene.

[0106] Step (6): The ionic solution and the elastic polymer material are dissolved in a chemical solvent and blended into a uniform mixture by ultrasonic vibration. A layer of composite fibers of the polymer material and the solid electrolyte, i.e., the electrolyte layer 210, is prepared on the composite film layer of the polymer fiber and the conductive nanomaterial formed in step (5) by electrospinning, as shown in FIG11e. For example, the thickness of the composite fiber layer can be 2 to 5 μm, and can be set to 5 μm, for example.

[0107] For example, the ionic solution can be one or more of 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium tetrafluoroborate, and tert-butyl peroxyacetate. The chemical solvent type can be the same as step (5). The elastic polymer material can be one or more of thermoplastic polyurethane (TPU), polyethylene, and nylon.

[0108] Step (7): On the electrolyte layer 210 prepared in step (6), the second electrode layer 202 of the tactile sensing unit 20 is prepared by electrospinning, as shown in FIG11f. The preparation method and requirements can be the same as step (5).

[0109] Step (8): Form an organic encapsulation layer 112 on the color filter layer 13 and the second electrode layer 202 of the tactile sensing unit 20, as shown in FIG11g. For example, an organic material layer can be formed on the color filter layer 13 and the second electrode layer 202 of the tactile sensing unit 20 by inkjet printing (IJP) to perform organic encapsulation. For example, the thickness of the organic encapsulation layer 112 can be 6 to 12 μm, for example, 8 μm.

[0110] Step (9): A second inorganic encapsulation layer 113 (CVD2) is formed on the organic encapsulation layer 112 formed in step (8) by a chemical vapor deposition process, as shown in FIG11h. For example, the thickness of the second inorganic encapsulation layer 113 (CVD2) can be 0.5 to 3 μm, such as 0.8 μm. The material of the second inorganic encapsulation layer 113 (CVD2) can be silicon nitride.

[0111] Step (10): A protective layer 14 (Cover Layer) is formed on the second inorganic encapsulation layer 113 (CVD2) formed in step 11h to obtain the display panel shown in Figure 1. For example, the material of the protective layer 14 may include: overcoat (OC), PET, ultra-thin glass (UTG), and colorless polyimide (CPI).

[0112] It is understandable that the preparation of the touch structure layer 440 of the comparative embodiment shown in FIG4 in the traditional touch process requires 5 masks, and each mask needs to go through the processes of coating, exposure, development, and etching, which requires at least 20 steps. In the above exemplary preparation process, the preparation of the touch layer only requires 4 steps: forming a conductive pattern layer 12, electrospinning a first electrode layer 201, an electrospinning electrolyte layer 210, and an electrospinning second electrode layer 202, and canceling the black matrix process (4 steps), which can reduce about 13 steps compared to traditional COE products. Therefore, the display panel provided in some embodiments of the present disclosure is also conducive to reducing product manufacturing processes, reducing production time, and reducing production costs.

[0113] 12a to 12h , the second exemplary preparation process may include the following steps (I) to (X).

[0114] Step (I): Providing a backplane layer 100 and forming a light-emitting device layer on the backplane layer 100 to obtain a display substrate 10 including multiple pixel units. The backplane layer 100 includes a first metal routing layer (SD1) and a second routing layer (SD2). Based on a pre-designed layout of touch signal lines 240 for each tactile sensing unit 20, multiple touch signal lines 240 are formed in the first metal routing layer (SD1), with each touch signal line 240 corresponding to a tactile sensing unit 20.

[0115] Step (II): forming a first inorganic encapsulation layer 111 (CVD1) on the light-emitting device layer, as shown in Figure 12a. For details, please refer to step (2) in the first exemplary preparation process above, which will not be repeated here.

[0116] Step (III): forming a color filter layer 13 on the first inorganic encapsulation layer 111 (CVD1), as shown in Figure 12b. For details, please refer to step (4) in the first exemplary preparation process above, which will not be repeated here.

[0117] Step (IV): Laser-drill a hole 230 at the bottom of the opening region 132 in the color filter layer 13. As shown in FIG12c , the hole 230 starts from the first inorganic encapsulation layer 111 (CVD1) and ends at the first metal trace layer (SD1). For example, the hole diameter can be 3 μm.

[0118] Step (V): As shown in FIG12d , a first electrode layer 201 of each tactile sensing unit 20 is formed within the opening region 132 of the color filter layer 13. It should be noted that during the formation of the first electrode layer 201, the material of the first electrode layer 201 is filled into the hole 230 formed in step (IV), thereby achieving a via connection between the first electrode layer 201 of the tactile sensing unit 20 and the corresponding touch signal line 240. The specific preparation process of the first electrode layer 201 can be referred to step (5) in the first exemplary preparation process described above and will not be repeated here.

[0119] Step (VI): As shown in FIG12e , an electrolyte layer 210 of each tactile sensing unit 20 is prepared on the first electrode layer 201 formed in step (V). The specific preparation process of the electrolyte layer 210 can refer to step (6) in the first exemplary preparation process described above and will not be repeated here.

[0120] Step (VII): As shown in FIG12f, the second electrode layer 202 of each tactile sensing unit 20 is prepared on the electrolyte layer 210 formed in step (VI). For details, please refer to step (7) of the first exemplary preparation process above, which will not be repeated here.

[0121] Step (VIII): As shown in Figure 12g, an organic encapsulation layer 112 is formed on the color filter layer 13 and the second electrode layer 202 of the touch sensing unit 20. For details, please refer to step (8) in the first exemplary preparation process above, which will not be repeated here.

[0122] Step (IX): As shown in Figure 12h, a second inorganic encapsulation layer 113 (CVD2) is formed on the organic encapsulation layer 112. For details, please refer to step (9) in the first exemplary preparation process above, which will not be repeated here.

[0123] Step (X): forming a protective layer 14 on the second inorganic encapsulation layer 113 (CVD2) to obtain the display panel shown in Figure 9. For details, please refer to step (10) in the first exemplary preparation process above, which will not be repeated here.

[0124] Thirdly, some embodiments of the present disclosure further provide a touch display device, including the display panel provided in any embodiment of the present disclosure. For example, the touch display device can be a mobile phone, tablet computer, monitor, vehicle display, digital photo frame, smart terminal, smart TV, wearable display device, etc., although this embodiment does not limit this.

[0125] The technical solutions provided in some embodiments of the present disclosure have at least the following technical effects or advantages: the display panel and its preparation method, as well as the touch display device provided in some embodiments of the present disclosure, abandon the traditional touch structure layer and black matrix, and realize the touch function by setting multiple tactile sensing units in the opening area between the color film units. In addition, the tactile sensing unit includes a black shading material, and the orthographic projection of the black shading material on the base substrate covers the opening area, so that the touch sensing unit also has a shading function. In this way, the distance between the color film layer and the light-emitting device in the direction perpendicular to the base substrate can be reduced, thereby reducing the absorption of the wide-angle light emitted by the light-emitting device by the tactile sensing unit with a shading function, which is conducive to improving the problem of excessively fast brightness decay at the viewing angle of traditional touch products based on COE technology.

[0126] The above description does not provide detailed explanations of technical details such as the patterning of each layer of the product. However, those skilled in the art will appreciate that various technical means can be used to form layers, regions, and the like in desired shapes. Furthermore, those skilled in the art may devise methods that differ from those described above to achieve the same structure. Although each embodiment has been described separately, this does not mean that the measures in each embodiment cannot be advantageously combined.

[0127] In addition, it should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure is limited to these examples. Within the context of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0128] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

Claims

1. A display panel, comprising: A display substrate, the display substrate comprising a base substrate and a plurality of pixel units arranged on the base substrate, each pixel unit comprising a plurality of sub-pixels; A color filter layer is arranged on the display substrate, the color filter layer comprises a plurality of color filter units, and an opening area is provided between adjacent color filter units; as well as A plurality of tactile sensing units are provided in the opening area, and the tactile sensing units include a black light-shielding material, and an orthographic projection of the black light-shielding material on the base substrate covers the opening area.

2. The display panel according to claim 1, wherein: The touch sensing unit comprises: a first electrode layer, a second electrode layer and an electrolyte layer located between the first electrode layer and the second electrode layer, wherein at least one of the first electrode layer, the second electrode layer and the electrolyte layer comprises the black light-shielding material; The interface between the first electrode layer and the electrolyte layer is a first interface, and the interface between the second electrode layer and the electrolyte layer is a second interface. The first electrode layer is connected to a first voltage signal, and the second electrode layer is connected to a second voltage signal. There is a voltage difference between the first voltage signal and the second voltage signal, so that interface capacitance is formed at the first interface and the second interface respectively. The interface capacitance at the first interface and / or the second interface changes in response to a touch operation performed by a user, and recovers after the touch operation ends.

3. The display panel according to claim 2, wherein: At least one of the first electrode layer, the second electrode layer and the electrolyte layer has a gap. When a user performs a touch operation, the gap at the corresponding position is compressed, the effective contact area of ​​the first interface and / or the second interface increases, and the interface capacitance increases.

4. The display panel according to claim 2, wherein: The first electrode layer and the second electrode layer include: a composite film layer of polymer fibers and conductive nanomaterials, wherein the conductive nanomaterials are: black conductive nanomaterials; The electrolyte layer comprises composite fibers of elastic polymer material and electrolyte material.

5. The display panel according to claim 4, wherein: The material of the polymer fiber includes: one or more of thermoplastic polyurethane, polypropylene, polyvinylidene fluoride, polyethylene and nylon; The conductive nanomaterial is: carbon fiber, carbon nanotube or graphene; The elastic polymer material includes: one or more of thermoplastic polyurethane, polyethylene and nylon; The electrolyte material includes: one or more of 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium tetrafluoroborate and tert-butyl peroxyacetate.

6. The display panel according to claim 2, wherein: The first electrode layers of adjacent tactile sensing units are separated, and the second electrode layers of the tactile sensing units are connected to each other.

7. The display panel according to claim 2, further comprising: A ground signal line and a touch signal line corresponding to each of the tactile sensing units, the first electrode layer of the tactile sensing unit is connected to the corresponding touch signal line, the touch signal line is configured to transmit the touch signal of the corresponding tactile sensing unit, and the second electrode layer of the tactile sensing unit is connected to the ground signal line.

8. The display panel according to claim 7, wherein: The first electrode layer is closer to the display substrate than the second electrode layer. The display panel further includes: a conductive pattern layer disposed on a side of the first electrode layer close to the display substrate, wherein the touch signal line is disposed in the conductive pattern layer.

9. The display panel according to claim 8, wherein: The material of the conductive pattern layer is a transparent conductive material.

10. The display panel according to claim 7, wherein: The first electrode layer is closer to the display substrate than the second electrode layer, and the display substrate comprises: a light emitting device layer disposed on the base substrate, the light emitting device layer comprising a plurality of light emitting devices for constituting the plurality of pixel units; A metal wiring layer is arranged between the base substrate and the light emitting device layer, the touch signal line is arranged in the metal wiring layer, and the first electrode layer of the tactile sensing unit is connected to the touch signal line through a via hole.

11. The display panel according to claim 10, wherein: The light emitting device layer comprises a pixel defining layer, the pixel defining layer has a pixel opening, and the light emitting device is arranged at the pixel opening; Along a direction perpendicular to the base substrate, the insulating layer between the first electrode layer and the pixel defining layer, the pixel defining layer, and the insulating layer between the pixel defining layer and the metal wiring layer are provided with through holes that are connected in sequence, and a connecting part is provided in the through hole, and the first electrode layer of the tactile sensing unit is connected to the corresponding touch signal line in the metal wiring layer through the connecting part.

12. The display panel according to claim 1, further comprising a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer; The display substrate comprises: A light-emitting device layer is arranged on the base substrate, the first inorganic encapsulation layer is arranged on a side of the light-emitting device layer close to the color filter layer and the tactile sensing unit, and the organic encapsulation layer and the second inorganic encapsulation layer are stacked in sequence on a side of the color filter layer and the tactile sensing unit away from the light-emitting device layer.

13. A method for preparing a display panel, the method comprising: Providing a display substrate, the display substrate comprising a base substrate and a plurality of pixel units arranged on the base substrate, each pixel unit comprising a plurality of sub-pixels; forming a color filter layer on the display substrate, wherein the color filter layer comprises a plurality of color filter units, and an opening area is provided between adjacent color filter units; as well as The opening area in the color filter layer forms a plurality of tactile sensing units, and the tactile sensing units include a black light shielding The black light-shielding material has an orthographic projection on the base substrate covering the opening area.

14. The method according to claim 13, wherein: A plurality of tactile sensing units are formed in the opening area of ​​the color filter layer, including: forming a first electrode layer of each tactile sensing unit in the opening area, and separating the first electrode layers of adjacent tactile sensing units; forming an electrolyte layer on the first electrode layer in the opening region; and A second electrode layer is formed on the electrolyte layer in the opening region.

15. A touch display device, comprising: The display panel according to any one of claims 1 to 12.

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