Touch display panel and touch display apparatus

Abstract

The present disclosure relates to the technical field of display. Provided are a touch display panel and a touch display apparatus. The touch display panel comprises a display substrate and a touch layer; the display substrate is provided with a plurality of light-emitting units; the touch layer comprises a plurality of touch electrodes and a light-absorbing layer, which are stacked on one side of the display substrate; the light-absorbing layer comprises first light-absorbing regions and second light-absorbing regions other than the first light-absorbing regions; one first light-absorbing region and one light-emitting unit overlap; one touch electrode and one second light-absorbing region overlap; the light-absorbing layer comprises a carrier and a plurality of light-absorbing micro-units which are arranged inside the carrier and are at least arranged within the first light-absorbing regions and the second light-absorbing regions; when the touch electrodes are powered on, the light-absorbing micro-units within the first light-absorbing regions move toward the second light-absorbing regions, so as to switch the light-absorbing layer from a first state to a second state; and, in the second state, the light transmittance of the first light-absorbing regions is higher than the light transmittance of the first light-absorbing regions in the first state. The touch display panel of the present disclosure can reduce screen reflection of the touch display panel in a screen-off state.

Description

Touch display panel and touch display device

[0001] Cross-referencing

[0002] This disclosure claims priority to Chinese Patent Application No. 202410683511.1, filed on May 29, 2024, entitled “Touch Display Panel and Touch 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 more specifically, to a touch display panel and a touch display device. Background Technology

[0004] Touch display panels are widely used in mobile phones, tablets, and other terminal devices, enabling human-computer interaction while displaying images. However, in current technology, touch display panels still reflect ambient light when the screen is off, affecting the display quality.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] A touch display panel and a touch display device.

[0007] According to one aspect of this disclosure, a touch display panel is provided, comprising:

[0008] The display substrate has multiple light-emitting units;

[0009] A touch layer includes multiple touch electrodes and a light-absorbing layer, wherein the touch electrodes and the light-absorbing layer are stacked on one side of the display substrate; the light-absorbing layer includes a first light-absorbing region and a second light-absorbing region outside the first light-absorbing region, wherein a first light-absorbing region overlaps with a light-emitting unit; a touch electrode overlaps with the second light-absorbing region; the light-absorbing layer includes a carrier and multiple light-absorbing micro-units disposed within the carrier and at least within the first light-absorbing region and the second light-absorbing region;

[0010] Wherein, the light-absorbing micro-units in the first light-absorbing region are used to move to the second light-absorbing region when the touch electrode is energized, so that the light-absorbing layer changes from a first state to a second state; in the second state, the light transmittance of the first light-absorbing region is higher than that of the first light-absorbing region in the first state.

[0011] A portion of the light-absorbing micro-units within the second light-absorbing region are used to move toward the first light-absorbing region when the touch electrode is de-energized, so that the light-absorbing layer changes from the second state to the first state.

[0012] In one exemplary embodiment of this disclosure, the light-absorbing micro-unit includes a transparent encapsulation layer, a transparent fluid is disposed within the encapsulation layer, and light-absorbing particles are disposed within the transparent fluid. When the touch electrode is energized, the light-absorbing particles are attracted by the touch electrode, move within the transparent fluid toward the touch electrode, and drive the light-absorbing micro-units in the first light-absorbing region to move toward the second light-absorbing region, thereby converting the light-absorbing layer to the second state. When the touch electrode is de-energized, it releases the attraction to the light-absorbing particles, thereby converting the light-absorbing layer back to the first state.

[0013] In one exemplary embodiment of this disclosure, the touch electrode includes a first touch electrode and a second touch electrode, the touch layer further includes a touch insulating layer, the touch insulating layer is disposed between the first touch electrode and the second touch electrode, and the light-absorbing layer is disposed between the first touch electrode and the second touch electrode.

[0014] In one exemplary embodiment of this disclosure, the first touch electrode extends along a first direction and is spaced apart along a second direction, and the first touch electrode is a mesh structure formed by intersecting grid lines; the second touch electrode extends along the second direction and is spaced apart along the first direction, and the second touch electrode is a mesh structure formed by intersecting grid lines; the first direction and the second direction intersect.

[0015] The first light-absorbing area overlaps with the mesh of the first touch electrode's mesh structure, and the first light-absorbing area overlaps with the mesh of the second touch electrode's mesh structure.

[0016] In one exemplary embodiment of this disclosure, in the first state, the concentration of the light-absorbing micro-units in the first light-absorbing region is less than the concentration of the light-absorbing micro-units in the second light-absorbing region.

[0017] In one exemplary embodiment of this disclosure, the touch display panel further includes a filter layer disposed on the light-emitting side of the display substrate. The filter layer includes a plurality of filter portions, one of which overlaps with one of the light-emitting units. The orthographic projection of the first light-absorbing area on the display substrate is located within the orthographic projection of the filter portion on the display substrate.

[0018] In one exemplary embodiment of this disclosure, the filter layer is disposed on the side of the touch layer near the display substrate.

[0019] In one exemplary embodiment of this disclosure, the filter layer further includes a transparent filter planarization layer that covers the filter portion.

[0020] In one exemplary embodiment of this disclosure, the shape of the orthographic projection of the first light-absorbing region on the display substrate is consistent with the shape of the orthographic projection of the light-emitting unit on the display substrate, and the orthographic projection of the light-emitting unit on the display substrate is located within the orthographic projection of the first light-absorbing region on the display substrate.

[0021] In one exemplary embodiment of this disclosure, the touch display panel has a display area and a peripheral area located outside the display area, and at least a portion of the touch electrodes are located within the display area; the display area has n sub-display areas, and the light-absorbing layer is located within i of the sub-display areas, i < n, n ≥ 2.

[0022] In one exemplary embodiment of this disclosure, the ratio of the maximum size a of the light-absorbing micro-unit to the size d of the light-absorbing layer in the direction perpendicular to the display substrate satisfies 1 < d / a ≤ 3.

[0023] In one exemplary embodiment of this disclosure, the ratio of the maximum size a of the light-absorbing micro-unit to the size m of the first light-absorbing region in the direction parallel to the display substrate satisfies 1 < m / a ≤ 2.

[0024] In one exemplary embodiment of this disclosure, the light-absorbing micro-unit is a solid structure made of light-absorbing material; the light-absorbing micro-unit in the first light-absorbing area is attracted by the touch electrode and moves toward the second light-absorbing area when the touch electrode is energized.

[0025] In one exemplary embodiment of this disclosure, the light-absorbing layer is disposed on the side of the touch insulating layer away from the display substrate.

[0026] In one exemplary embodiment of this disclosure, the display substrate includes:

[0027] Drive backplane;

[0028] A pixel definition layer is located on the same side of the driving backplate as the light-emitting unit, and has pixel openings that define the range of each light-emitting unit;

[0029] The orthographic projection of the pixel opening on the driving backplate is located within the orthographic projection of the first light-absorbing area on the driving backplate.

[0030] According to one aspect of this disclosure, a touch display device is provided, comprising the display panel described in any one of the foregoing claims.

[0031] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0033] Figure 1 is a top view of one embodiment of the touch display panel of this disclosure.

[0034] Figure 2 is a partial cross-sectional view of one embodiment of the touch display panel of this disclosure.

[0035] Figure 3 is a top view of the touch electrode layer of one embodiment of the touch display panel of this disclosure.

[0036] Figure 4 is a schematic diagram of the light-absorbing layer in the first state of an embodiment of the touch display panel of this disclosure.

[0037] Figure 5 is a schematic diagram of the light-absorbing layer in the second state of one embodiment of the touch display panel of this disclosure.

[0038] Figure 6 is a partial cross-sectional view of one embodiment of the touch display panel of this disclosure.

[0039] Figure 7 is a schematic diagram of the light-absorbing layer in one embodiment of the touch display panel of this disclosure.

[0040] Figure 8 is a schematic diagram of a light-absorbing micro-unit in one embodiment of the touch display panel of this disclosure.

[0041] Figures 9 to 12 are schematic diagrams showing the shape of the orthographic projection of the first light-absorbing area on the driving backplate in some embodiments of the touch display panel of this disclosure. Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0043] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0044] It should be noted that the first direction Y and the second direction X in this document are two intersecting directions. In the accompanying drawings of this disclosure, the second direction X can be a horizontal direction, i.e., a row direction, and the first direction Y can be a vertical direction, i.e., a column direction. The two are perpendicular to each other, but are not limited to this. The first direction Y and the second direction X can also be non-perpendicular directions. Furthermore, those skilled in the art will understand that as the display panel rotates, the actual orientation of the first direction Y and the second direction X may change, but their relative positions remain unchanged.

[0045] In this article, the "overlap" of features A and B means that the orthographic projections of features A and B on a plane at least partially coincide; the plane can be the surface of a display substrate, driving backplane, substrate, etc.

[0046] In this article, "same layer setting" means that A and B belong to different regions that are continuous or discontinuous within the same film layer, and each region can be formed simultaneously; "different layers" means that A and B belong to different film layers, and different film layers refer to film layers that are formed at different times.

[0047] This disclosure provides a touch display panel, as shown in FIG1. ​​The touch display panel includes a display area AA and a peripheral area WA located outside the display area AA. The peripheral area WA can be a continuous annular area surrounding the display area AA, or it can be a discontinuous area surrounding the display area AA. For example, the peripheral area WA can be distributed on both sides of the display area AA. The display area AA can be used to emit light to display images, while the peripheral area WA does not emit light.

[0048] The peripheral area WA is a continuous annular region surrounding the display area AA. It may include fan-out areas FA distributed along the first direction Y with the display area AA. For example, the peripheral area WA may be formed by the fan-out areas FA and a U-shaped peripheral area. The fan-out area FA has a bonding portion BA, which may have multiple conductive contacts. The conductive contacts can be connected to the driving circuit board via a flexible circuit board, or directly to the driving circuit board. One of the driving circuit board, the flexible circuit board, and the fan-out area FA may be equipped with a display chip for controlling image display.

[0049] In some embodiments, the fan-out area FA may have a bent area extending along the second direction X. The bent area is a flexible structure that can be bent, and the bonding part BA is located on the side of the bent area away from the display area AA. By bending the bent area, the fan-out area FA can be bent to the backlight side of the touch display panel, that is, the side opposite to the light emission direction; thereby, it can be connected to the bonding part BA on the backlight side of the touch display panel.

[0050] As shown in Figure 2, the touch display panel may include a display substrate PNL for displaying images, which may include a driving backplate BP and multiple light-emitting units LD disposed on one side of the driving backplate BP, wherein:

[0051] The driving backplane (BP) has a driving circuit that drives the light-emitting unit (LD) to emit light to display an image. In some embodiments of this disclosure, the driving backplane (BP) may include a substrate and a circuit layer located on one side of the substrate. The substrate may be a flat plate structure, and its material may be a rigid material such as glass or a flexible material such as polyimide. Furthermore, the substrate may be a single-layer or multi-layer structure.

[0052] The circuit layer includes the aforementioned driving circuitry. For example, the driving circuitry may include pixel circuitry located in the display area AA and peripheral circuitry located in the peripheral area WA. The pixel circuitry can be a 3T1C, 7T1C, 8T1C, or similar structure, as long as it can drive the light-emitting units (LDs) to emit light. No special limitations are placed on its structure here. Here, nTmC indicates that one pixel circuit includes n thin-film transistors (represented by the letter "T") and m capacitors (represented by the letter "C"). The number of pixel circuits can be the same as the number of light-emitting units (LDs), and they are connected one-to-one with each LD. Of course, multiple LDs can be connected to the same pixel circuit; no special limitations are placed here.

[0053] The peripheral circuit is connected to the pixel circuit and is used to input driving signals to the pixel circuit in order to control the light-emitting unit (LD) to emit light. The peripheral circuit may include a gate driving circuit and a light-emitting control circuit, and of course, it may also include other circuits. The specific structure of the peripheral circuit is not specifically limited here.

[0054] The aforementioned driving circuit may include multiple thin-film transistors (TFTs) and capacitors. The TFTs may be top-gate or bottom-gate type TFTs. Each TFT may include an overlapping active layer and a gate, with the active layers of each TFT disposed on the same semiconductor layer; alternatively, they may be disposed on multiple semiconductor layers, with the active layers of different TFTs distributed on different semiconductor layers. The material of the semiconductor layer may be polycrystalline silicon or metal oxide, without special limitation.

[0055] The circuit layer may also include traces for transmitting signals that are connected to pixel circuits and peripheral circuits. For example, a column of pixel circuits may be connected to a data line extending along a first direction Y. Data signals can be transmitted through the data line. The data line may extend to the fan-out region FA and be connected to the bonding portion BA. The gate driving circuit and the light emission control circuit may be connected to multiple traces such as clock signal lines. These traces may also extend to the fan-out region FA and be connected to the bonding portion BA.

[0056] Taking a top-gate thin-film transistor as an example, in some embodiments, the circuit layer may include a semiconductor layer, a first gate insulating layer, a first gate layer, a second gate insulating layer, a second gate layer, an interlayer dielectric layer, a first source / drain layer, a passivation layer, a first planarization layer, a second source / drain layer, and a second planarization layer stacked sequentially along the direction away from the substrate. The active layer of the thin-film transistor is located on the semiconductor layer, the gate is located on the first gate layer, and the two plates of the capacitor are located on the first gate layer and the second gate layer. The first source / drain layer and the second source / drain layer are used to realize connections between at least some of the thin-film transistors and between the thin-film transistors and the capacitor, and are used to transmit drive signals. The type of drive signal and the specific pattern of each film layer depend on the specific configuration of the drive circuit and are not specifically limited here.

[0057] As shown in Figure 2, the light-emitting unit (LD) can be an OLED (Organic Light-Emitting Diode) using organic light-emitting materials, or a Mini LED (sub-millimeter light-emitting diode, size 100μm-200μm), Micro LED (micro light-emitting diode, size no larger than 100μm), or LED (light-emitting diode, size larger than 200μm) using inorganic light-emitting materials. No special limitations are imposed here, as long as it can emit light. The light-emitting unit (LD) is located within the display area AA. Of course, some light-emitting units (LDs) can also be located in the peripheral area WA, but the light-emitting units (LDs) located in the peripheral area WA can be floating and do not emit light.

[0058] Taking an OLED as an example, the light-emitting unit (LD) may include a first electrode (ANO), a light-emitting functional layer (EL), and a second electrode (CAT) stacked sequentially along the direction away from the driving backplane (BP). By applying an electrical signal to the first electrode (ANO) and the second electrode (CAT), the light-emitting functional layer (EL) can be excited to emit light; the specific light-emitting principle will not be detailed here. The first electrode (ANO) can serve as the anode, and the second electrode (CAT) can serve as the cathode; both are made of conductive materials such as metals and metal oxides. The light-emitting functional layer (EL) may include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer stacked sequentially along the direction away from the driving backplane (BP). Of course, other structures can also be used, as long as they can cooperate with the first electrode (ANO) and the second electrode (CAT) to emit light.

[0059] The light-emitting unit (LD) can adopt a top-emitting structure, where the first electrode (ANO) is reflective and the second electrode (CAT) is transparent, causing the LD to emit light away from the driving backplate (BP). In this case, the light-emitting side of the display substrate (PNL) is the side of the LD away from the driving backplate (BP), and the backlight side is the side of the driving backplate (BP) away from the LD. Alternatively, the LD can adopt a bottom-emitting structure, where the second electrode (CAT) is reflective, and the first electrode (ANO) is transparent, causing the LD to emit light towards the driving backplate (BP). In this case, the light-emitting side of the display substrate (PNL) is the side of the driving backplate (BP) away from the LD, and the backlight side is the side of the LD away from the driving backplate (BP). This article only uses the top-emitting LD as an example for explanation.

[0060] It should be noted that the above-mentioned reflective and transmissive structures for the first electrode ANO and the second electrode CAT do not mean that the reflectivity and transmittance reach 100%. The transmissive structure can have a certain reflective effect, and the reflective structure can also have a certain transmittance.

[0061] As shown in Figure 2, the display substrate PNL may further include a pixel definition layer PDL that separates the light-emitting units (LDs). The pixel definition layer PDL can be disposed on the same side of the driving backplane BP as the LDs. For example, the pixel definition layer PDL can be disposed on the surface of the second planarization layer away from the substrate, along with the first electrodes ANOs. Simultaneously, the thickness of the pixel definition layer PDL is greater than the thickness of the first electrodes ANOs, covering a portion of each first electrode ANO. The pixel definition layer PDL has pixel openings PH that expose each first electrode ANO, with one pixel opening PH exposing one first electrode ANO. The pixel definition layer PDL can be used to define the range of each light-emitting unit (LD). The shape and size of the light-emitting unit (LD) are defined by the pixel openings PH; the range of the light-emitting unit (LD) is the range of the pixel opening PH, and the size of the light-emitting unit (LD) is the size of the pixel opening PH.

[0062] The range of a pixel opening PH is the range of a light-emitting unit LD, and the boundary of the orthographic projection of the light-emitting unit LD onto the driving backplane BP is the boundary of the orthographic projection of the opening onto the driving backplane BP.

[0063] The light-emitting functional layer EL is at least partially located within the pixel opening PH and is stacked with the first electrode ANO. The second electrode CAT may cover the light-emitting functional layer EL, and the second electrode CAT may be a continuous solid layer structure, allowing each light-emitting unit LD to share the same second electrode CAT. The sum of the thicknesses of the light-emitting functional layer EL and the second electrode CAT is less than the thickness of the pixel definition layer PDL, allowing the second electrode CAT to be recessed into the opening at the position corresponding to the pixel opening PH.

[0064] In some embodiments of this disclosure, as shown in FIG2, the light-emitting functional layer EL has an intermittent structure. The light-emitting functional layer EL of each light-emitting unit LD is independently and spaced apart, and the light-emitting colors of different light-emitting units LD can be different. Specifically, at least the light-emitting material layer in the light-emitting functional layer EL can be divided into multiple light-emitting parts that are correspondingly disposed in each pixel opening PH. Other film layers of the light-emitting functional layer EL can also be arrayed or disposed as a whole layer. The light-emitting functional layer EL corresponding to each light-emitting part can emit light independently, and the light-emitting colors of different light-emitting units LD can be different, thereby directly realizing color display.

[0065] Each light-emitting unit (LD) includes at least two different sizes of light-emitting units (LDs); the different sizes of light-emitting units emit different colors. For example, each light-emitting unit (LD) includes at least a first light-emitting unit emitting red light, a second light-emitting unit emitting blue light, and a third light-emitting unit emitting green light. The orthographic projections of the three light-emitting units (LDs) on the driving backplate (BP) are all rectangular, and the area of ​​the orthographic projection of the first and second light-emitting units is larger than the area of ​​the orthographic projection of the third light-emitting unit. The areas of the orthographic projections of the first and second light-emitting units can be the same or different; for example, the area of ​​the orthographic projection of the first light-emitting unit is larger than the area of ​​the orthographic projection of the second light-emitting unit.

[0066] In some embodiments of this disclosure, the light-emitting functional layer EL can also simultaneously cover the pixel definition layer PDL and each first electrode ANO, that is, the light-emitting functional layer EL is a whole layer structure, and each light-emitting unit LD can share the same light-emitting functional layer EL. In this case, the light-emitting color of each light-emitting unit LD is the same.

[0067] In some embodiments of this disclosure, the display panel may further include a filter layer CFL, which may be disposed on the light-emitting side of the display substrate PNL and includes a plurality of filter sections CF, wherein the filter sections CF overlap one-to-one with the light-emitting units LD, that is, the filter sections CF correspond one-to-one with the openings of the pixel definition layer PDL, so that the light emitted by the light-emitting units LD can reach the corresponding filter section CF.

[0068] In some embodiments of this disclosure, different light-emitting units (LDs) can emit different colors of light, and a filter layer (CF) can transmit monochromatic light while absorbing other colors of light. The color of the filter layer (CF) is the same as the color of its corresponding light-emitting unit (LD), ensuring normal light emission from the display panel. Simultaneously, the filtering effect of the filter material can absorb ambient light of different colors, reducing ambient light reaching reflective films such as the second electrode (CAT). Furthermore, the filter layer (CF) can absorb some of the ambient light reflected by the second electrode (CAT), thereby reducing ambient light reflection and improving display performance. By using the filter layer (CFL), it is possible to avoid using a thicker circular polarizer to filter out ambient light and some light reflected from within the display panel, which helps reduce the thickness of the display panel. It absorbs external ambient light and ambient light reflected by the second electrode (CAT), thereby reducing ambient light reflection.

[0069] In other embodiments of this disclosure, the light-emitting functional layer EL is a single-layer structure, and the light emitted by each light-emitting unit LD is the same color. The display panel may also include the aforementioned filter layer CFL, which defines the light color through each filter CF, thereby achieving color display when the light emitted by each light-emitting unit LD is the same. Simultaneously, the filter layer CFL can still serve the aforementioned function of reducing reflection. For example, each filter CF includes a red filter RCF, a green filter GCF, and a blue filter BCF. The white light emitted by the light-emitting unit LD becomes monochromatic light corresponding to each filter CF after passing through different filter CFs.

[0070] In some embodiments, referring to Figure 2, the thicknesses of the color filters (CF) can be different. For example, the thickness of the red filter (RCF) is less than the thickness of the green filter (GCF) and the blue filter (BCF). The thickness of the green filter (GCF) can be equal to or unequal to the thickness of the blue filter (BCF). Since the refractive indices of the different colored filter CFs are different, the unevenness of light caused by the different refractive indices of the filter CFs can be compensated by adjusting the thickness of each filter CF, thereby optimizing the display effect of the display panel.

[0071] In some embodiments of this disclosure, referring to FIG2, the filter layer CFL may further include an anti-reflection absorbing layer BM, which may be disposed on the light-emitting side of the display substrate PNL and on the same surface as the filter portion CF. The anti-reflection absorbing layer BM may be made of a black light-absorbing material, for example, the anti-reflection absorbing layer BM may be made of a resin mixed with carbon black, thereby absorbing light. The anti-reflection absorbing layer BM has a plurality of anti-reflection apertures BH, and each filter portion CF is at least partially defined within an anti-reflection aperture BH, that is, the filter portions CF can be used to fill each anti-reflection aperture BH one-to-one, thereby defining the position of each filter portion CF by the anti-reflection absorbing layer BM and preventing light transmission between adjacent filter portions CF. The thickness of the filter portion CF and the depth of the anti-reflection aperture BH may be the same or different, and no special limitation is made here. An anti-reflection aperture BH may overlap with a pixel opening PH, so that the light emitted by a light-emitting unit LD can be emitted through the overlapping filter portion CF.

[0072] Furthermore, as shown in Figure 2, to prevent the anti-reflection absorption layer BM from blocking the light-emitting unit LD, the orthogonal projection of the pixel opening PH on the driving backplane BP can be located within the orthogonal projection of the anti-reflection aperture BH on the driving backplane BP. For example, the boundary of the orthogonal projection of the pixel opening PH on the driving backplane BP is located inside the boundary of the orthogonal projection of the anti-reflection aperture BH on the driving backplane BP, and the distance between the two boundaries is 0.5μm-1μm, that is, not less than 0.5μm and not greater than 1μm. Of course, the boundary of the orthogonal projection of the pixel opening PH on the driving backplane BP can also coincide with the boundary of the orthogonal projection of the anti-reflection aperture BH on the driving backplane BP.

[0073] Furthermore, as shown in Figure 2, the filter layer CFL may also include a filter planarization layer COC, which can cover the filter portion CF and the anti-reflection absorption layer BM to achieve planarization so that other film layers can be stacked on it. The filter planarization layer COC can be made of materials such as light-transmitting optical adhesive.

[0074] As shown in Figure 2, the touch display panel also includes a TFE encapsulation layer, which covers each light-emitting unit (LD) to block external moisture and oxygen, preventing the LD from being corroded. In some embodiments of this disclosure, the TFE encapsulation layer can be a thin-film encapsulation method, which may include a first inorganic layer CVD1, an organic layer IJP, and a second inorganic layer CVD2, wherein:

[0075] The first inorganic layer CVD1 can cover each light-emitting unit (LD), that is, the first inorganic layer CVD1 can cover the surface of the second electrode CAT away from the driving backplane BP. For the discontinuous structure of the second electrode CAT, the first inorganic layer CVD1 can also cover the area of ​​the pixel definition layer (PDL) not covered by the second electrode CAT. The thickness of the first inorganic layer CVD1 is less than the thickness of the pixel definition layer (PDL), and it can be recessed at the pixel opening PH. The material of the first inorganic layer CVD1 can include inorganic insulating materials such as silicon nitride and silicon oxide.

[0076] The organic layer IJP can be disposed on the surface of the first inorganic layer CVD1 away from the driving backplate BP. The boundary of the orthographic projection of the organic layer IJP on the driving backplate BP can be located in the peripheral area WA, ensuring that the organic layer IJP can cover each light-emitting unit LD.

[0077] The second inorganic layer CVD2 can cover the organic layer IJP and the first inorganic layer CVD1, which is not covered by the organic layer IJP. The second inorganic layer CVD2 can block the intrusion of water and oxygen, and planarization is achieved by the organic layer IJP, which is fluid before curing. The material of the second inorganic layer CVD2 can include inorganic insulating materials such as silicon nitride and silicon oxide.

[0078] As shown in Figure 2, the touch display panel may further include a touch layer TSP, which may be disposed on the light-emitting side of the display substrate PNL, for example, on the side of the display encapsulation layer TFE away from the driving backplane BP, and is used to sense touch operations. The touch layer TSP may include a touch electrode layer. The touch electrode layer may adopt a capacitive touch structure, which may be a mutual capacitance structure or a self-capacitive structure.

[0079] Specifically, the touch electrode layer can adopt a self-capacitive structure. The touch electrode layer is divided into multiple electrode blocks by electrode gaps for sensing touch operations. At least some of the electrode blocks are distributed along the first direction Y and the second direction X. At least some of the electrode blocks are located within the display area AA, which is both the area for displaying images and the area for touch. The touch electrode layer may also include touch leads connected to the electrode blocks. The touch leads extend to the fan-out area FA and are connected to the bonding portion BA for transmitting touch signals. Each electrode block can serve as a touch electrode. The number of touch leads can be the same as the number of electrode blocks, and one end of each touch lead is connected to a touch electrode, while the other end extends to the fan-out area FA. The shape of the electrode blocks can be rectangular or other polygonal. Capacitance can be generated between the electrode blocks and the finger. When the finger touches the area, the capacitance of the touch area changes, thereby generating a touch sensing signal.

[0080] In some embodiments of this disclosure, the touch electrode layer may employ a mutual capacitance structure. The touch electrode layer may include multiple touch electrodes, each comprising multiple first touch electrodes TMA and second touch electrodes TMB. Each first touch electrode TMA extends along a first direction Y and is spaced apart along a second direction X. Each second touch electrode TMB extends along the second direction X and is spaced apart along the first direction Y, such that each second touch electrode TMB intersects with a first touch electrode TMA. The first touch electrodes TMA and second touch electrodes TMB are stacked, for example, referring to FIG3, with the second touch electrodes TMB located on the side of the first touch electrodes TMA away from the display substrate PNL.

[0081] The touch electrode layer may also include touch leads. Referring to Figure 3, the touch leads may include a first touch lead TL1 and a second touch lead TL2. One end of the first touch lead TL1 is connected to a first touch electrode TMA, and the other end extends to the fan-out area FA. One end of the second touch lead TL2 is connected to a second touch electrode TMB, and the other end extends to the fan-out area FA.

[0082] One of the first touch electrode TMA and the second touch electrode TMB can be used as a driving electrode and the other as a sensing electrode. The driving electrode can receive driving signals and form a capacitor between the first touch electrode TMA and the second touch electrode TMB. When a finger touches the electrode, the capacitance of the touch area changes, and the sensing electrode emits a touch sensing signal.

[0083] In some embodiments of this disclosure, the touch electrode layer may be a mesh structure formed by intersecting grid lines NHL, having a plurality of mesh openings NH; one mesh opening NH may overlap with at least one light-emitting unit LD, for example, the mesh openings NH may overlap one-to-one with the pixel openings PH, and the mesh openings NH are not smaller than the pixel openings PH that overlap with them. Thus, light emitted by the light-emitting unit LD can pass through the mesh openings NH.

[0084] Specifically, for a self-capacitive touch structure, the touch electrode is a mesh structure formed by intersecting grid lines; one mesh pore NH can overlap with at least one light-emitting unit LD. For a mutual-capacitive touch structure, the first touch electrode TMA is a mesh structure formed by intersecting grid lines, having multiple first mesh pores NH1; the second touch electrode TMB is a mesh structure formed by intersecting grid lines, having multiple second mesh pores NH2. The light-emitting unit LD can overlap with the first mesh pores NH1 in a one-to-one correspondence. For example, the first mesh pores NH1 can overlap with the pixel openings PH in a one-to-one correspondence, and the first mesh pore NH1 is not smaller than the pixel opening PH it overlaps with. The light-emitting unit LD can overlap with the second mesh pores NH2 in a one-to-one correspondence. For example, the second mesh pores NH2 can overlap with the pixel openings PH in a one-to-one correspondence, and the second mesh pore NH2 is not smaller than the pixel opening PH it overlaps with. Referring to Figures 4 to 7, the first mesh pores NH1 can overlap with the second mesh pores NH2 in a one-to-one correspondence. The first mesh NH1 and the second mesh NH2 can be polygonal shapes such as rectangles, rhombuses, and pentagons.

[0085] In some embodiments of this disclosure, the touch layer TSP further includes a touch insulating layer TLD. The touch insulating layer TLD is disposed between the first touch electrode TMA and the second touch electrode TMB. Its material can be an inorganic insulating material such as silicon nitride, silicon oxide, or silicon oxynitride, or an organic insulating material such as optical adhesive, as long as it provides insulation. Referring to Figures 4 to 7, the touch insulating layer TLD covers the first touch electrode TMA, and the second touch electrode TMB is disposed on the side of the touch insulating layer TLD away from the display substrate PNL, thereby being insulated from the first touch electrode TMA.

[0086] Furthermore, in some embodiments of this disclosure, the first touch electrode TMA and the second touch electrode TMB can be interchanged, that is, the first touch electrode TMA is disposed on the side of the second touch electrode TMB away from the display substrate PNL.

[0087] Both the first touch electrode TMA and the second touch electrode TMB can be single-layer or multi-layer conductive structures. For example, the first touch electrode TMA may include two outer layers and an intermediate layer between the two outer layers. The outer layers may be made of titanium, and the intermediate layer may be made of aluminum, i.e., the first touch electrode TMA has a titanium / aluminum / titanium structure; or, the outer layers may be made of indium tin oxide (ITO), and the intermediate layer may be made of aluminum, i.e., the first touch electrode TMA has an ITO / Ag / ITO structure. Similarly, if the second touch electrode TMB is a multi-layer structure, it can also be a titanium / aluminum / titanium structure or an ITO / Ag / ITO structure.

[0088] Furthermore, in some embodiments of this disclosure, the touch layer TSP may further include a touch buffer layer TBU and a touch planarization layer TOC, as shown in Figures 4 to 7, wherein:

[0089] The buffer layer TBU can be disposed on the light-emitting side of the display substrate PNL. Its material may include inorganic insulating materials such as silicon nitride, silicon oxide, and silicon oxynitride. It is used to prevent impurities on the side of the touch layer TSP close to the display substrate PNL from affecting the formation of the touch layer TSP.

[0090] The touch planarization layer TOC can cover the touch electrode layer, specifically, it can cover either the first touch electrode TMA or the second touch electrode TMB, depending on the relative positions of the first touch electrode TMA and the second touch electrode TMB. If the first touch electrode TMA is located on the side of the second touch electrode TMB closer to the display substrate PNL, then the touch planarization layer TOC covers the second touch electrode TMB. The touch planarization layer TOC is used to achieve planarization so that other film layers can be stacked on it. The touch planarization layer TOC can be made of materials such as light-transmitting optical adhesive, and no special limitations are made here.

[0091] Of course, in other embodiments of this disclosure, the touch layer TSP may not include either the touch buffer layer TBU or the touch flattening layer TOC.

[0092] In some embodiments of this disclosure, the touch layer TSP can be directly disposed on the surface of the encapsulation layer TFE away from the driving backplane BP, and the filter layer CFL can be disposed on the side of the touch layer TSP away from the driving backplane BP; in this case, the filter portion CF of the filter layer CFL and the anti-reflection absorption layer BM can block the touch electrode layer to prevent it from reflecting ambient light.

[0093] In some embodiments of this disclosure, the touch layer TSP can also be disposed on the side of the filter layer CFL away from the display substrate PNL. For example, the filter layer CFL is stacked on the surface of the encapsulation layer TFE away from the driving backplane BP, and the touch layer TSP is stacked on the surface of the filter layer CFL away from the driving backplane BP. In this way, the distance between the touch electrode layer and the second electrode CAT can be increased, reducing the interference of the second electrode CAT on the touch electrode, improving the signal-to-noise ratio, which is beneficial to improving touch accuracy and reducing the risk of touch abnormalities.

[0094] The inventors discovered that during the use of the display panel, ambient light entering the panel from the outside is reflected inside the display panel, such as in the film layers of the second electrode CAT. The reflected light is captured by the human eye, resulting in poor black display effect of the display panel. Specifically, the screen is dark gray when the screen is off, or the image contrast is low when partially displayed.

[0095] To reduce ambient light reflection from the display panel, as shown in Figures 4 and 5, the inventors propose that a light-absorbing layer AL be disposed in the touch layer TSP. The light-absorbing layer AL and the touch electrode layer are stacked on one side of the display substrate PNL. The light-absorbing layer AL includes a first light-absorbing region AL1 and a second light-absorbing region AL2 outside the first light-absorbing region AL1. A first light-absorbing region AL1 overlaps with a light-emitting unit LD, and a touch electrode overlaps with the second light-absorbing region AL2, so that the light from the light-emitting unit LD can be emitted from the first light-absorbing region AL1. The light-absorbing layer AL includes a carrier and a plurality of light-absorbing micro-units MU disposed within the carrier and at least within the first light-absorbing region AL1 and the second light-absorbing region AL2. When the touch electrode is energized, the light-absorbing micro-units MU in the first light-absorbing region AL1 move towards the second light-absorbing region AL2, so that the light-absorbing layer AL changes from a first state to a second state. In the second state, the light transmittance of the first light-absorbing region AL1 is higher than that in the first state.

[0096] The first state can be the screen-off state of the display panel, as shown in Figure 4. The second state can be the screen-on state of the display panel, as shown in Figure 5. In the first state, multiple light-absorbing micro-units MU in the first light-absorbing area AL1 and the second light-absorbing area AL2 can absorb ambient light, thereby reducing the amount of ambient light entering the display panel. The light-absorbing micro-units MU also absorb ambient light that enters the display panel and is reflected, thus reducing the amount of ambient light reflected from the display panel. In the second state, the light-absorbing micro-units MU in the first light-absorbing area AL1 move towards the second light-absorbing area AL2, reducing the number of light-absorbing micro-units MU in the first light-absorbing area AL1 and increasing light transmittance. This reduces or even eliminates the impact on the light emitted by the light-emitting unit LD from the first light-absorbing area AL1, allowing the display panel to display normally. Simultaneously, colored light emitted from the display substrate PNL, such as colored light directly emitted by the light-emitting unit LD or colored light formed by the light-filtering section CF, may exhibit cross-color phenomenon. In the second state, the light-absorbing micro-units MU are concentrated in the second light-absorbing area AL2, and can also absorb the light emitted by the display substrate PNL that may cause cross-color, thereby preventing cross-color from occurring.

[0097] In some embodiments of this disclosure, when the touch electrode is de-energized, the light-absorbing micro-units MU in the second light-absorbing region AL2 are no longer attracted by the external electric field, so that some of the light-absorbing micro-units MU in the second light-absorbing region AL2 can move to the first light-absorbing region AL1, so that the light-absorbing layer AL changes from the second state to the first state, the concentration of light-absorbing micro-units MU in the first light-absorbing region AL1 increases, and the light transmittance decreases, thereby reducing the ambient light reflected from inside the display panel.

[0098] It should be noted that the light-absorbing layer AL described in this disclosure can switch between a first state and a second state. The light transmittance of the first light-absorbing region AL1 is higher in the second state than in the first state. The terms "first state" and "second state" are only used to distinguish the different light transmittance states of the first light-absorbing region AL1 and the second light-absorbing region AL2 within the light-absorbing layer AL under different energizing conditions of the touch electrode. They do not represent that the light transmittance of the first light-absorbing region AL1 and the second light-absorbing region AL2 is constant in the "first state," or that the light transmittance of the first light-absorbing region AL1 and the second light-absorbing region AL2 is constant in the "second state." For example, in some embodiments, the light transmittance of the first light-absorbing region AL1 before the touch electrode is energized may not be equal to the light transmittance of the first light-absorbing region AL1 after the touch electrode is energized and then de-energized; naturally, the light transmittance of the second light-absorbing region AL2 before the touch electrode is energized may also not be equal to the light transmittance of the second light-absorbing region AL2 after the touch electrode is energized and then de-energized.

[0099] Specifically, in some embodiments of this disclosure, the light-absorbing layer AL and the touch electrode layer are stacked on one side of the display substrate PNL, and the transition between the first state and the second state of the light-absorbing layer AL is controlled by the touch electrode. The touch electrode layer can have the aforementioned self-capacitive structure, with the light-absorbing layer AL disposed on one side of the touch electrode. Alternatively, referring to Figures 4 to 7, the touch electrode layer can have the aforementioned mutual-capacitive structure, and the touch electrode includes multiple first touch electrodes TMA and second touch electrodes TMB.

[0100] In some embodiments, the light-absorbing layer AL can be disposed on the side of the first touch electrode TMA away from the second touch electrode TMB, and the electric field generated by the energization of the first touch electrode TMA attracts the light-absorbing micro-units MU in the first light-absorbing region AL1 to move towards the second light-absorbing region AL2. In other embodiments, the light-absorbing layer AL can be disposed on the side of the second touch electrode TMB away from the first touch electrode TMA, and the electric field generated by the energization of the second touch electrode TMB attracts the light-absorbing micro-units MU in the first light-absorbing region AL1 to move towards the second light-absorbing region AL2.

[0101] In some embodiments of this disclosure, referring to the schematic diagram of the light-absorbing layer AL in the first state shown in FIG. 4 and the schematic diagram of the light-absorbing layer AL in the second state shown in FIG. 5, the light-absorbing layer AL is disposed between the first touch electrode TMA and the second touch electrode TMB. For example, the first touch electrode TMA, the touch insulating layer TLD, the light-absorbing layer AL, and the second touch electrode TMB are sequentially stacked on the light-emitting side of the display substrate PNL. The electric field formed between the first touch electrode TMA and the second touch electrode TMB when they are energized attracts the light-absorbing micro-units MU in the first light-absorbing region AL1 to move towards the second light-absorbing region AL2. The first light-absorbing region AL1 overlaps with the first mesh NH1 of the mesh structure of the first touch electrode TMA and the second mesh NH2 of the mesh structure of the second touch electrode TMB. The light-absorbing layer AL is disposed on the side of the touch insulating layer TLD away from the display substrate PNL, which can improve the flatness of the light-absorbing layer AL and make it easier to control the concentration of the light-absorbing micro-units MU in the first light-absorbing region AL1 and the second light-absorbing region AL2. In addition, the light-absorbing layer AL can reduce light with a large divergence angle, thus serving as a privacy protection layer.

[0102] In other embodiments, the first touch electrode TMA, the light-absorbing layer AL, the touch insulating layer TLD, and the second touch electrode TMB may be sequentially stacked on the light-emitting side of the display substrate PNL. That is, the light-absorbing layer AL is disposed on the side of the touch insulating layer TLD closer to the display substrate PNL, which can increase the viewing angle of the touch display panel and reduce brightness attenuation at a wide viewing angle. As mentioned above, in the above embodiments, the positions of the first touch electrode TMA and the second touch electrode TMB can be interchanged.

[0103] In some embodiments of this disclosure, the touch layer TSP is disposed on the side of the filter layer CFL away from the display substrate PNL, and the filter layer CFL may not have an anti-reflection absorption layer BM as shown in FIG2. For example, the filter layer CFL includes the aforementioned plurality of filter portions CF and a transparent filter planarization layer COC. The filter planarization layer COC covers the filter portions CF on the side of the filter portions CF close to the touch layer TSP, and the first touch electrode TMA can be directly stacked on the side of the filter planarization layer COC away from the display substrate PNL, as shown in FIG4 to FIG7. According to the foregoing analysis, the light-absorbing layer AL can reduce the reflection of ambient light by the display panel, thereby replacing the anti-reflection absorption layer BM, simplifying the manufacturing process of the display panel, and helping to reduce costs and improve yield.

[0104] In one exemplary embodiment of this disclosure, referring to Figures 4 to 7, the orthographic projection of the first light-absorbing region AL1 onto the driving backplane BP is located within the orthographic projection of the filter portion CF onto the driving backplane BP. For example, the touch layer TSP is disposed on the side of the filter layer CFL away from the display substrate PNL to prevent light that has not been filtered by the filter portion CF from passing through the first light-absorbing region AL1.

[0105] In one exemplary embodiment of this disclosure, referring to Figures 7 and 8, the light-absorbing micro-unit MU includes a transparent encapsulation layer WL, a transparent fluid is disposed within the encapsulation layer WL, and light-absorbing particles ALP are disposed within the transparent fluid. The light-absorbing particles ALP can move electrophoretically within the transparent fluid under the action of an electric field, be attracted by the touch electrode, move towards the touch electrode, and drive the light-absorbing micro-unit MU to move towards the second light-absorbing region AL2.

[0106] For example, the light-absorbing particles (ALP) are black charged particles, such as carbon black or latex spheres with a core-shell structure containing residual double bonds. The core and shell material of the latex spheres can be polymethacrylic acid, polymethyl methacrylate, or copolymers of the above with styrene. The residual double bonds on the core and shell of the latex spheres react with metal oxides such as osmium tetroxide, producing strong light absorption and giving the latex spheres their black color. The encapsulation layer (WL) can be an insulating material to prevent the aggregation of the light-absorbing particles (ALP). A transparent fluid is provided within the encapsulation layer (WL) to disperse the light-absorbing particles (ALP). The transparent fluid can include organic solvents with low kinematic viscosity and insulating properties, such as epoxides, hydrocarbon solvents, halogenated organic solvents, etc. The transparent fluid can also be doped with charge control agents such as organic sulfonates, organic amides, etc., to make the surface of the light-absorbing particles (ALP) charged, enabling them to respond to an electric field and maintain the stability of the system. The transparent fluid can also be doped with surfactants such as ethylene glycol ethers, alkylamines, succinate sulfonates, etc., acting as stabilizers to reduce the aggregation and precipitation of light-absorbing particles (ALP) on the inner wall of the encapsulation layer (WL).

[0107] It should be noted that the "transparent" structures described in this disclosure, such as transparent encapsulation layers (WL) and transparent fluids, refer to structures with high light transmittance. In practice, "transparent" structures may not be completely transparent; for example, they may have colors such as light gray or light yellow, depending on their physicochemical properties.

[0108] In one exemplary embodiment of this disclosure, the light-absorbing micro-unit MU is a solid structure of light-absorbing material, such as a solid sphere, a cube or other polyhedral structure, or an irregularly shaped particle. The light-absorbing micro-unit MU itself may carry an electric charge, such as a positive charge. The light-absorbing micro-unit MU can move electrophoretically in a transparent fluid under the action of an electric field, be attracted by the touch electrode, and move in the direction of the touch electrode, that is, move towards the second light-absorbing region AL2.

[0109] The light-absorbing micro-unit MU is disposed within a carrier, which can be a gel-like material. The light-absorbing micro-unit MU is suspended within the carrier and can be combined with an adhesive to form a coating liquid, which is then coated to form a light-absorbing layer AL. For example, the light-absorbing layer AL can be formed using a screen printing process.

[0110] In one exemplary embodiment of this disclosure, the light-absorbing layer AL can be formed by inkjet printing on the surface of the touch insulating layer TLD away from the display substrate PNL, for example, between the touch insulating layer TLD and the second touch electrode TMB. During the formation of the light-absorbing layer AL, the flowability of the light-absorbing micro-units MU within the light-absorbing layer AL carrier can be controlled by controlling process parameters such as leveling time and curing time.

[0111] In one exemplary embodiment of this disclosure, in a first state, the concentration of light-absorbing micro-units MU in the first light-absorbing region AL1 is lower than the concentration of light-absorbing micro-units MU in the second light-absorbing region AL2. The lower concentration of light-absorbing micro-units MU in the first light-absorbing region AL1 allows it to have a light absorption effect when the screen is off. Simultaneously, when the screen is on, the light transmittance of the first light-absorbing region AL1 can rapidly increase to a higher level, avoiding any impact on the light emission of the display panel.

[0112] In one exemplary embodiment of this disclosure, the ratio of the concentration of light-absorbing micro-units MU in the first light-absorbing region AL1 to the concentration of light-absorbing micro-units MU in the second light-absorbing region AL2 can also be controlled by controlling process parameters such as leveling time. For example, the ratio of the concentration of light-absorbing micro-units MU in the second light-absorbing region AL2 to the concentration of light-absorbing micro-units MU in the first light-absorbing region AL1 is greater than 1 and less than 15. For example, the ratio of the concentration of light-absorbing micro-units MU in the second light-absorbing region AL2 to the concentration of light-absorbing micro-units MU in the first light-absorbing region AL1 is greater than 4.5 and less than 10.5.

[0113] In one exemplary embodiment of this disclosure, the orthographic projection of the light-emitting unit LD on the driving backplate BP is located within the orthographic projection of the first light-absorbing region AL1 on the driving backplate BP. The shape of the orthographic projection of the first light-absorbing region AL1 on the driving backplate BP is consistent with the shape of the orthographic projection of the light-emitting unit LD on the driving backplate BP. For example, the orthographic projection of the first light-absorbing region AL1 on the driving backplate BP coincides with the orthographic projection of the pixel opening PH on the driving backplate BP. Another example is that the boundary of the orthographic projection of the pixel opening PH on the driving backplate BP is located inside the boundary of the orthographic projection of the first light-absorbing region AL1 on the driving backplate BP; for example, the distance between the two boundaries is 0.5μm-1μm, that is, not less than 0.5μm and not greater than 1μm.

[0114] The shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplate BP can be consistent with the shape of the orthographic projection of the light-emitting unit LD onto the driving backplate BP. The shape of the first light-absorbing region AL1 can be designed according to the light-emitting unit LD. The shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplate BP can be as shown in Figures 9 to 12. For example, if the shape of the orthographic projection of the light-emitting unit LD onto the driving backplate BP is rhomboid, referring to Figures 9 and 10, the shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplate BP can be the same or similar to a rhombus, rectangle, etc.; if the shape of the orthographic projection of the light-emitting unit LD onto the driving backplate BP is circular, referring to Figure 11, the shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplate BP can be the same or similar to a circle, ellipse, etc. The shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplate BP can be a proportional scaling of the shape of the orthographic projection of the light-emitting unit LD onto the driving backplate BP, or it can be stretched or compressed to a certain extent in the first direction Y and the second direction X within the driving backplate BP.

[0115] In one exemplary embodiment of this disclosure, the shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplane BP may not be consistent with the shape of the orthographic projection of the light-emitting unit LD onto the driving backplane BP. For example, referring to FIG12, the shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplane BP may be a polygon, a star, or other shapes. Specifically, the shape of the orthographic projection of the first light-absorbing region AL1 onto the driving backplane BP can be adjusted and optimized according to the required light emission effect, such as color shift, brightness attenuation with viewing angle, power consumption, etc.

[0116] In one exemplary embodiment of this disclosure, the ratio of the maximum size a of the light-absorbing microunit MU to the size d of the light-absorbing layer AL in the direction perpendicular to the display substrate PNL satisfies 1 < d / a ≤ 3. That is, the ratio of the thickness d of the light-absorbing layer AL to the maximum size a of the light-absorbing microunit MU satisfies 1 < d / a ≤ 3. The maximum size a of the light-absorbing microunit MU mentioned in this disclosure refers to the maximum value of the distance between the two points with the largest distance on the outer surface of a light-absorbing microunit MU.

[0117] For example, in one exemplary embodiment, the light-absorbing micro-unit MU includes a transparent encapsulation layer WL, a transparent fluid is disposed within the encapsulation layer WL, and light-absorbing particles ALP are disposed within the transparent fluid. The maximum size a of the light-absorbing micro-unit MU is 30 to 50 μm, i.e., 30 μm ≤ a ≤ 50 μm, and the thickness d of the light-absorbing layer AL satisfies 50 μm < d ≤ 150 μm.

[0118] In one exemplary embodiment, the ratio of the maximum size *a* of the light-absorbing microunit MU to the size *m* of the first light-absorbing region AL1 in the direction parallel to the display substrate PNL satisfies 1 < m / a ≤ 2. The size *m* of the first light-absorbing region AL1 in the direction parallel to the display substrate PNL can be the size of the first light-absorbing region AL1 in the first direction Y, the size of the first light-absorbing region AL1 in the second direction X, or the size of the first light-absorbing region AL1 in a direction that lies in the plane of both the first and second directions Y and does not coincide with either direction X. In this disclosure, the size *m* of the first light-absorbing region AL1 in the direction parallel to the display substrate PNL can be the maximum size among the aforementioned sizes. For example, the maximum size *a* of the light-absorbing microunit MU is 30 to 50 μm, i.e., 30 μm ≤ a ≤ 50 μm, and the size *m* of the first light-absorbing region AL1 in the direction parallel to the display substrate PNL satisfies 30 μm < m ≤ 100 μm.

[0119] For example, at least one layer of light-absorbing micro-units MU is provided in the thickness direction of the light-absorbing layer AL; the size of the light-emitting unit LD in the direction parallel to the display substrate PNL is about 50 μm, that is, the maximum size of the pixel opening PH in the orthogonal projection of the driving back plate BP is about 50 μm. In the light-absorbing layer AL, one or more layers of light-absorbing micro-units MU can be accommodated in the first light-absorbing area AL1, and each layer includes up to 4 light-absorbing micro-units MU.

[0120] In one exemplary embodiment of this disclosure, the light-absorbing micro-unit MU is a solid structure of light-absorbing material, and the maximum size a of the light-absorbing micro-unit MU is 3 to 6 μm, i.e., 3 μm ≤ a ≤ 6 μm. The ratio of the maximum size a of the light-absorbing micro-unit MU to the size d of the light-absorbing layer AL in the direction perpendicular to the display substrate PNL satisfies 5 ≤ ​​d / a ≤ 30. The ratio of the maximum size a of the light-absorbing micro-unit MU to the size m of the first light-absorbing region AL1 in the direction parallel to the display substrate PNL satisfies 8 ≤ m / a ≤ 17. The definition of the size d of the light-absorbing layer AL in the direction perpendicular to the display substrate PNL and the size m of the first light-absorbing region AL1 in the direction parallel to the display substrate PNL is the same as in the aforementioned embodiments, and will not be repeated here.

[0121] In one exemplary embodiment of this disclosure, at least some touch electrodes are located within a display area AA, which has n sub-display areas, and a light-absorbing layer AL is located within i sub-display areas. Those skilled in the art will understand that n and i are both natural numbers, i < n and n ≥ 2. The light-absorbing layer AL may be provided only in some sub-display areas, not throughout the entire display area AA. In sub-display areas where the light-absorbing layer AL is not provided, a touch anti-reflection light-absorbing layer may be provided. This touch anti-reflection light-absorbing layer may be disposed in the same layer as the light-absorbing layer AL. The touch anti-reflection light-absorbing layer may be made of a black insulating material, such as a resin mixed with carbon black, to absorb ambient light and prevent ambient light reflected from the touch electrode layer from affecting the display effect. To avoid blocking the light emission of the light-emitting unit LD, the touch anti-reflection light absorption layer can also be provided with light-transmitting holes that overlap with the light-emitting unit LD. The light-transmitting holes of the touch anti-reflection light absorption layer can overlap one-to-one with the pixel opening PH. The orthographic projection of a pixel opening PH on the driving back plate BP can be located within the orthographic projection of the overlapping light-transmitting hole on the driving back plate BP.

[0122] In the sub-display area where the light-absorbing layer AL is located, the light-absorbing micro-units MU can absorb light when the screen is off, thus providing a superior display effect compared to other sub-display areas without the light-absorbing layer AL. Within the display area AA of the same touch display panel, the sub-display area with the light-absorbing layer AL can be compared with the display effects of other sub-display areas, more intuitively demonstrating the effect of the light-absorbing layer AL in optimizing the display effect. In one application scenario, a specific area within the display area AA of the touch display panel can also be selected as an optimized display area. When partially displaying within this area, such as displaying characters, the contrast between the off pixels and the on pixels is higher.

[0123] This disclosure also provides a touch display device, which may include the touch display panel of any of the above embodiments. The specific structure and beneficial effects of the touch display panel can be referred to the above embodiments of the touch display panel, and will not be described in detail here. The touch display device of this disclosure can be a medium or large-sized touch display device such as a tablet computer, a laptop computer, or an in-vehicle display, or it can be used in other electronic devices with touch display functions such as mobile phones and smartwatches, which will not be listed here.

[0124] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A touch display panel, comprising: a display substrate having a plurality of light emitting units; a touch layer comprising a plurality of touch electrodes and a light absorbing layer, the touch electrodes and the light absorbing layer being stacked on one side of the display substrate; the light absorbing layer comprising a first light absorbing region and a second light absorbing region outside the first light absorbing region, one of the first light absorbing regions overlapping one of the light emitting units; one of the touch electrodes overlapping the second light absorbing region; the light absorbing layer comprising a carrier and a plurality of light absorbing micro-units arranged in the carrier and at least in the first light absorbing region and the second light absorbing region; wherein the light absorbing micro-units in the first light absorbing region are configured to move to the second light absorbing region when the touch electrodes are energized, so that the light absorbing layer is converted from a first state to a second state; the light transmittance of the first light absorbing region in the second state is higher than that in the first state; part of the light absorbing micro-units in the second light absorbing region are configured to move to the first light absorbing region when the touch electrodes are de-energized, so that the light absorbing layer is converted from the second state to the first state. 2.The touch display panel of claim 1, wherein, The light absorbing micro-units comprise a transparent wrapping layer, the wrapping layer contains a transparent fluid, and the transparent fluid contains light absorbing particles; the light absorbing particles are configured to be attracted by the touch electrodes when the touch electrodes are energized, to move in the transparent fluid towards the touch electrodes, and to drive the light absorbing micro-units in the first light absorbing region to move towards the second light absorbing region, so that the light absorbing layer is converted to the second state; the touch electrodes release the attraction to the light absorbing particles when de-energized, so that the light absorbing layer is converted to the first state. 3.The touch display panel of claim 1, wherein, The touch electrodes comprise first touch electrodes and second touch electrodes, and the touch layer further comprises a touch insulating layer arranged between the first touch electrodes and the second touch electrodes, and the light absorbing layer is arranged between the first touch electrodes and the second touch electrodes. 4.The touch display panel of claim 3, wherein, The first touch electrodes extend along a first direction and are spaced apart along a second direction, and the first touch electrodes are in a mesh structure formed by intersecting grid lines; the second touch electrodes extend along the second direction and are spaced apart along the first direction, and the second touch electrodes are in a mesh structure formed by intersecting grid lines; the first direction and the second direction intersect; wherein the first light absorbing region overlaps the mesh holes of the mesh structure of the first touch electrodes, and the first light absorbing region overlaps the mesh holes of the mesh structure of the second touch electrodes. 5.The touch display panel of claim 1, wherein, The concentration of the light absorbing micro-units in the first light absorbing region is less than the concentration of the light absorbing micro-units in the second light absorbing region in the first state. 6.The touch display panel of claim 5, wherein, The ratio of the concentration of the light absorbing micro-units in the second light absorbing region to the concentration of the light absorbing micro-units in the first light absorbing region is greater than 4.5 and less than 10.

5. 7.The touch display panel of claim 1, wherein, The touch display panel further comprises a filter layer disposed on the light exit side of the display substrate, the filter layer comprising a plurality of filter portions, one filter portion overlapping one light emitting unit; the orthographic projection of the first light absorbing region on the display substrate is located within the orthographic projection of the filter portion on the display substrate. 8.The touch display panel of claim 7, wherein, The filter layer is disposed on the side of the touch layer close to the display substrate. 9.The touch display panel of claim 8, wherein, The filter layer further comprises a transparent filter flat layer covering the filter portions. 10.The touch display panel of claim 1, wherein, The shape of the orthographic projection of the first light absorbing region on the display substrate is consistent with the shape of the orthographic projection of the light emitting unit on the display substrate, and the orthographic projection of the light emitting unit on the display substrate is located within the orthographic projection of the first light absorbing region on the display substrate. 11.The touch display panel of claim 10, wherein, The distance between the boundary of the orthographic projection of the light emitting unit on the display substrate and the boundary of the orthographic projection of the first light absorbing region on the display substrate is not less than 0.5 μm and not greater than 1 μm. 12.The touch display panel of claim 2, wherein, The wrapping layer is insulating material. 13.The touch display panel of any one of claims 1-12, wherein, The touch display panel has a display area and a peripheral area outside the display area, at least part of the touch electrodes being located in the display area; the display area has n sub-display areas, the light absorbing layer being located in i sub-display areas, i < n, n ≥ 2. 14.The touch display panel of claim 1, wherein, The ratio of the maximum size a of the light absorbing micro-unit to the size d of the light absorbing layer perpendicular to the direction of the display substrate satisfies 1 < d / a ≤ 3. 15.The touch display panel of claim 1, wherein, The ratio of the maximum size a of the light absorbing micro-unit to the size m of the first light absorbing region parallel to the direction of the display substrate satisfies 1 < m / a ≤ 2.

16. The touch display panel according to claim 1, wherein, The light absorbing micro-unit is a solid structure of light absorbing material; the light absorbing micro-unit in the first light absorbing region is used to be attracted by the touch electrode and move towards the second light absorbing region when the touch electrode is energized. 17.The touch display panel of claim 3, wherein, The light absorbing layer is disposed on the side of the touch insulating layer away from the display substrate. 18.The touch display panel of claim 3, wherein, The light absorbing layer is disposed on the side of the touch insulating layer close to the display substrate. 19.The touch display panel of claim 1, wherein, The display substrate comprises: a drive backplane; a pixel definition layer disposed on the same side of the drive backplane as the light emitting unit, and having a pixel opening defining the range of each light emitting unit; the orthographic projection of one pixel opening on the drive backplane is located within the orthographic projection of one first light absorbing region on the drive backplane.

20. A touch display device comprising the touch display panel of any one of claims 1-19.

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