Pixel structure and display panel

Abstract

This invention discloses a pixel structure and a display panel, relating to the field of display panel technology. The pixel structure includes multiple pixels arranged in an array. Each pixel includes a blue sub-pixel, a first sub-pixel, and a second sub-pixel. Projected onto a horizontal plane, the first sub-pixel has a concave rounded corner. The blue sub-pixel is racetrack-shaped and includes two elongated horizontal strips and a vertical strip connecting the two horizontal strips. The two horizontal strips and the vertical strip enclose a receiving space. The two ends of the horizontal strips have first rounded ends that match the rounded corners. The second sub-pixel is disposed within the receiving space and has at least one second rounded end. The vertical strip has an arc-shaped groove adapted to the second rounded end. This invention has the advantage of improving the lifespan of the blue luminescent material, thereby extending the lifespan of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display panel technology, and in particular to a pixel structure and a display panel. Background Technology

[0002] Organic light-emitting diode (OLED) display panels, due to their advantages such as self-illumination, wide viewing angle, high contrast, and flexibility, have been widely used in smartphones, televisions, automotive displays, and wearable devices. OLED display panels typically consist of an array of pixels, each including red, green, and blue sub-pixels, with each color sub-pixel emitting light using a corresponding organic light-emitting material. However, blue organic light-emitting materials have higher exciton energies, making them prone to photo-oxidation and molecular conjugated chain breakage during long-term electroluminescence, leading to irreversible degradation of the material structure and a continuous decline in luminous efficiency. Under the same illumination conditions, the lifespan of blue sub-pixels is typically only one-fifth to one-third that of red and green sub-pixels. Premature aging of blue sub-pixels can cause problems such as color shift and white balance failure in the display panel, severely limiting the overall service life of the OLED display panel. Therefore, extending the lifespan of blue sub-pixels has become a pressing technical problem in the field of display panel technology.

[0003] Therefore, it is necessary to provide a new pixel structure and display panel to solve the above-mentioned technical problems. Summary of the Invention

[0004] The main objective of this invention is to propose a pixel structure and display panel that aims to improve the technical problem of short lifespan of blue luminescent materials in display panels in related technologies.

[0005] To achieve the above objectives, according to some embodiments of the present invention, a pixel structure is proposed, comprising a plurality of pixels arranged in an array. Each pixel includes a blue sub-pixel, a first sub-pixel, and a second sub-pixel. Projected onto a horizontal plane, the first sub-pixel forms a concave arc corner. The blue sub-pixel is racetrack-shaped and includes two elongated horizontal strips and a vertical strip connecting the two horizontal strips. The two horizontal strips and the vertical strip enclose a receiving space. The two ends of the horizontal strips are provided with first arc ends that match the arc corners. The second sub-pixel is disposed within the receiving space and forms at least one second arc end. The vertical strip is provided with an arc-shaped groove adapted to the second arc end.

[0006] In some embodiments, there is one vertical strip, which is connected to the same end of two horizontal strips. The two horizontal strips and one vertical strip enclose the receiving space with an opening, and the second sub-pixel is disposed adjacent to the first sub-pixel.

[0007] In some embodiments, there are two vertical strips, and the two horizontal strips and the two vertical strips enclose the enclosing space. There are two second arc ends, and each vertical strip is provided with an arc-shaped groove that mates with the second arc end.

[0008] In some embodiments, the area of ​​the blue sub-pixel is larger than the area of ​​the first sub-pixel, and the area of ​​the blue sub-pixel is larger than the area of ​​the second sub-pixel; or, The first sub-pixel is a green sub-pixel, and the second sub-pixel is a red sub-pixel; or, The first sub-pixel is a red sub-pixel, and the second sub-pixel is a green sub-pixel.

[0009] According to some embodiments of the present invention, a display panel is provided, the display panel including a driving backplate and a pixel defining layer disposed on the driving backplate, the pixel defining layer defining a pixel space, and further including the pixel structure described above, the pixel structure being disposed within the pixel space.

[0010] In some embodiments, the pixel space includes a blue pixel space, and the display panel further includes a first electrode layer and a second electrode layer disposed at a relative interval in the blue pixel space, wherein the blue sub-pixel fills the gap between the first electrode layer and the second electrode layer; the blue sub-pixel includes a blue fluorescent material layer, wherein the material of the blue fluorescent material layer is ZnS:Ag,Cl.

[0011] In some embodiments, the first electrode layer is disposed on the side facing the second electrode layer, and the second electrode layer is disposed on the side facing the first electrode layer, with the two insulating dielectric layers respectively on opposite sides of the blue fluorescent material layer.

[0012] In some embodiments, the display panel further includes an insulating layer and isolation pillars disposed on the pixel defining layer. The insulating layer covers the isolation pillars and the surface of the pixel defining layer corresponding to the blue pixel space. The edges of the first electrode layer and the second electrode layer are respectively connected to the insulating layer.

[0013] In some embodiments, the display panel further includes a barrier wall, which includes a top sub-barrier wall and a bottom sub-barrier wall. The bottom sub-barrier wall is attached to the side of the first electrode layer opposite to the second electrode layer, and the top sub-barrier wall is attached to the side of the second electrode layer opposite to the first electrode layer. The top sub-barrier wall is connected to the insulating layer.

[0014] In some embodiments, both the first electrode layer and the second electrode layer are made of carbon nanofibers, silver nanowires, binders, and coupling agents, and both the first electrode layer and the second electrode layer have a three-dimensional porous honeycomb structure. The pore size of the three-dimensional porous honeycomb structure is 150 nm to 700 nm, and the porosity of the three-dimensional porous honeycomb structure is 60% to 75%; and / or, The carbon nanofibers comprise 40%~50%, the silver nanowires comprise 20%~30%, the binder comprises 20%~30%, and the coupling agent comprises 1%~2%. In the above scheme, the pixel structure includes multiple pixels arranged in an array. Each pixel includes a blue sub-pixel, a first sub-pixel, and a second sub-pixel. Projected onto a horizontal plane, the first sub-pixel has a concave rounded corner, the blue sub-pixel is racetrack-shaped, and a receiving space and a first rounded end matching the rounded corner are formed within the blue sub-pixel. The second sub-pixel is disposed within the receiving space. This invention has the advantage of improving the lifespan of the blue luminescent material, thereby extending the lifespan of the display panel. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the pixel structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the pixel structure according to an embodiment of the present invention; Figure 3 This is another schematic diagram of the pixel structure in an embodiment of the present invention; Figure 4 This is another schematic diagram of the pixel structure according to an embodiment of the present invention; Figure 5 This is a cross-sectional structural diagram of the display panel according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the layered structure of the composite electrode of the display panel according to an embodiment of the present invention; Figure 7 This is another cross-sectional view of the display panel according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the composite electrode structure according to an embodiment of the present invention; Figure 9This is a schematic diagram of the three-dimensional porous honeycomb structure of the composite electrode according to an embodiment of the present invention; Figure 10 This is a schematic flowchart of the preparation method of the composite electrode according to the first embodiment of the present invention.

[0017] Explanation of icon numbers: 1000, Display panel; 100. Pixel structure; 1. Pixel; 11. Blue sub-pixel; 111. Accommodation space; 112. First arc end; 113. Arc groove; 114. Horizontal strip; 115. Vertical strip; 12. First sub-pixel; 121. Arc corner; 13. Second sub-pixel; 131. Second arc end; 2. Driving backplate; 3. Pixel limiting layer; 4. First electrode layer; 5. Second electrode layer; 6. Three-dimensional porous honeycomb structure; 7. Barrier wall; 71. Bottom sub-barrier wall; 72. Top sub-barrier wall; 8. Insulating layer; 9. Insulating dielectric layer; 10. Composite light-emitting layer; 101. Insulating material; 102. Blue fluorescent material layer; 103. Isolation pillar.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] Currently, the lifespan bottleneck of blue emitting materials in organic light-emitting diode (OLED) display panels remains a key challenge restricting the overall service life of these panels. Traditional OLED blue emitting materials are mostly small organic molecules with high exciton energies. During long-term operation, they are prone to photo-oxidation, conjugated chain breakage, and carrier loss, resulting in a lifespan typically only one-fifth to one-third that of green and red OLED materials, severely limiting the overall lifespan of the display panel. Increasing the emitting area of ​​blue sub-pixels is one effective way to extend their lifespan; however, simply increasing the area can encroach on the arrangement space of other sub-pixels, leading to a decrease in pixel density or aperture ratio.

[0023] The applicant noted that in traditional pixel structures, subpixels are typically arranged in regular shapes such as rectangles or squares. This regular arrangement often results in large ineffective gaps between adjacent subpixels when the area of ​​blue subpixels needs to be increased, limiting the pixel density and aperture ratio of the display panel. At the same time, the low blue light emission efficiency further exacerbates the lifespan degradation of blue subpixels, and simply increasing the area cannot fundamentally solve the technical problem of short lifespan of blue subpixels.

[0024] Based on the above considerations, in order to solve the aforementioned problems, the applicant, after in-depth research, designed a pixel structure.

[0025] Please see Figure 1 and Figure 2According to some embodiments of the present invention, a pixel structure 100 is proposed, including a plurality of pixels 1 arranged in an array, each pixel 1 including a blue sub-pixel 11, a first sub-pixel 12 and a second sub-pixel 13; in the projection on the horizontal plane, the first sub-pixel 12 forms a concave arc corner 121, the blue sub-pixel 11 is racetrack shaped, and a receiving space 111 and a first arc end 112 matching the arc corner 121 are formed in the blue sub-pixel 11, and the second sub-pixel 13 is disposed in the receiving space 111.

[0026] In this embodiment, the projection on the horizontal plane refers to the projection on a plane parallel to the surface of the driving backplate 2. Unlike the red and green sub-pixels, which use conventional organic light-emitting materials, the blue sub-pixel 11 is a sub-pixel that emits light using an alternating current electroluminescent material, and its shape is racetrack-shaped. The first sub-pixel 12 has a recessed arc corner 121, which means that the corner region of the first sub-pixel 12 is recessed inward to form an arc-shaped notch. The blue sub-pixel 11 has a first arc end 112 that matches the aforementioned recessed arc corner 121, that is, the end of the blue sub-pixel 11 is an outwardly convex arc shape, and the convex first arc end 112 can be precisely inserted into the recessed arc corner 121 of the first sub-pixel 12, achieving a tight fit between the two. An accommodating space 111 is formed inside the blue sub-pixel 11, which is used to accommodate the second sub-pixel 13. By placing the second sub-pixel 13 within the accommodating space 111 inside the blue sub-pixel 11, and simultaneously matching and fitting the concave arc corner 121 of the first sub-pixel 12 with the first arc end 112 of the blue sub-pixel 11, a tight interlocking arrangement is achieved between the sub-pixels, effectively reducing the ineffective gaps between them. With the same pixel area, the light-emitting area of ​​the blue sub-pixel 11 is significantly increased, thereby effectively extending the lifespan of the blue sub-pixel 11. In some embodiments, the light-emitting area of ​​the blue sub-pixel 11 can reach twice that of the red and green sub-pixels. Simultaneously, the racetrack-shaped structure helps optimize the uniformity of the ACEL (Alternating Current Electroluminescence) electric field distribution. ACEL is essentially a uniform surface emission, relying on a strong electric field passing through the light-emitting layer to achieve light emission; it illuminates as long as the electric field covers it. The racetrack shape allows for a larger blue area without increasing the total pixel width. Meanwhile, the racetrack shape is more suitable for the electric field distribution of ACELs because the upper and lower electrodes of ACELs have a perpendicular electric field. The slender shape makes the electric field more uniform, avoids point discharge, and is less prone to local breakdown. The blue sub-pixel 11 can also be called the blue ACEL sub-pixel. Furthermore, this embodiment does not require increasing the driving voltage to match the brightness of the red and green pixels, further reducing the operating voltage and slowing down the material decay rate. This embodiment has the advantage of improving the lifespan of the blue sub-pixel 11, thereby improving the overall lifespan of the light-emitting panel.

[0027] Please see Figure 1 and Figure 2 In some embodiments, the second sub-pixel 13 has at least one second arc end 131, and the inner wall of the accommodating space 111 is provided with an arc groove 113 adapted to the second arc end 131.

[0028] The second arc end 131 refers to the outwardly protruding arc shape formed at the end of the second sub-pixel 13. An arc-shaped groove 113 is provided on the inner wall of the receiving space 111. This arc-shaped groove 113 is an inwardly recessed arc-shaped groove, the shape and size of which are adapted to the second arc end 131. When the second sub-pixel 13 is placed within the receiving space 111, the second arc end 131 is precisely embedded in the arc-shaped groove 113, allowing the second sub-pixel 13 and the blue sub-pixel 11 to form a tight fit on the inner wall of the receiving space 111. Through the above-mentioned design of the arc end and the arc-shaped groove 113, the positioning of the second sub-pixel 13 within the receiving space 111 is more accurate, the gap between them is further reduced, the light-emitting area of ​​the blue sub-pixel 11 is more effectively utilized, and the structural stability between the sub-pixels is also enhanced.

[0029] Please see Figure 1 and Figure 2 In some embodiments, the blue sub-pixel 11 includes two elongated horizontal strips 114 and a vertical strip 115 connecting the two horizontal strips 114. The vertical strip 115 is connected to the same end of the two horizontal strips 114, and the two horizontal strips 114 and the vertical strip 115 form an open receiving space 111. The two ends of the horizontal strips 114 are provided with first arcuate ends 112. The vertical strip 115 is provided with an arcuate groove 113 that mates with a second arcuate end 131. The second sub-pixel 13 is disposed adjacent to the first sub-pixel 12.

[0030] The horizontal strip 114 is an elongated strip-shaped area extending along a first direction, with two horizontal strips 114 arranged parallel and spaced apart. The vertical strip 115 is an elongated strip-shaped area extending along a second direction, connecting the same end of the two horizontal strips 114, so that the two horizontal strips 114 and one vertical strip 115 together form an accommodating space 111 with an opening on one side. The horizontal strip 114 is elongated and thin, with a first arc end 112 at both ends, which respectively mates with the arc angle 121 of two adjacent first sub-pixels 12. That is, the two ends of the horizontal strip 114 are outwardly convex arcs, used to mate with the concave arc angle 121 of the first sub-pixels 12. The vertical strip 115 is provided with an arc groove 113, which is an inwardly concave arc-shaped groove, used to mate with the second arc end 131 of the second sub-pixel 13. The second sub-pixel 13 is disposed within the accommodating space 111, and is disposed adjacent to the first sub-pixel 12. With the above structure, the blue sub-pixel 11 has a racetrack-shaped structure with an opening on one side. The first sub-pixel 12 is fitted with the first rounded ends 112 at both ends of the horizontal strip 114 of the blue sub-pixel 11 through the concave rounded corner 121. The second sub-pixel 13 is embedded in the arc-shaped groove 113 of the vertical strip 115 through the second rounded end 131, thus achieving a compact arrangement of the three sub-pixels.

[0031] Please see Figure 3 and Figure 4 In some embodiments, the blue sub-pixel 11 includes two elongated horizontal strips 114 and two vertical strips 115 connecting the two horizontal strips 114 respectively. The two horizontal strips 114 and the two vertical strips 115 enclose a closed receiving space 111. The second sub-pixel 13 is disposed within the receiving space 111. There are two second arcuate ends 131. Each vertical strip 115 is provided with an arcuate groove 113 that mates with the second arcuate end 131.

[0032] The horizontal strips 114 are elongated regions extending along a first direction, with two horizontal strips 114 arranged parallel and spaced apart. The vertical strips 115 are elongated regions extending along a second direction, with two vertical strips 115 connecting the two ends of the two horizontal strips 114 respectively, so that the two horizontal strips 114 and the two vertical strips 115 together enclose a closed receiving space 111. The second sub-pixel 13 is disposed within the closed receiving space 111. The two second arc ends 131 of the second sub-pixel 13 respectively cooperate with the arc-shaped grooves 113 provided on the two vertical strips 115. Through the above structure, the blue sub-pixel 11 has a closed racetrack-shaped ring structure, with the blue sub-pixel 11 completely surrounding the second sub-pixel 13, and the second sub-pixel 13 embedded inside the blue sub-pixel 11, resulting in a tighter fit between the two. This closed structure allows the second sub-pixel 13 to be completely surrounded by the blue sub-pixel 11, which, while increasing the light-emitting area of ​​the blue sub-pixel 11, can also optimize the distribution of the ACEL electric field by utilizing the ring structure of the blue sub-pixel 11, further improving the luminous efficiency.

[0033] Furthermore, the applicant should also note that the embodiments of this application have the following advantages: 1. The emitted white light is purer and has less color cast. The white light seen by the human eye is actually the result of a spatial mixture of blue, red, and green light. In this application, the blue sub-pixel 11 surrounds the second sub-pixel 13 and is close to the first sub-pixel 12. The blue light is around the red and green light. Compared to the blue light being concentrated in a square or circular area, the three-color emitted light in this application mixes immediately upon emission, with almost no mixing distance, resulting in a more uniform and purer white with less regional color cast.

[0034] II. Wider viewing angle and no color cast at large angles. One of the biggest drawbacks of existing OLED displays is color cast when viewed from the side. This is mainly because the blue sub-pixels 11 are concentrated in a square or other shaped area. When viewed at an angle, the relative positions of the three colors of light shift, resulting in a noticeable yellow or blue tint when viewed from the side. In the technical solution of this application, the blue sub-pixels are symmetrically distributed around the perimeter. Regardless of the viewing angle, the proportion of the three colors of light remains essentially unchanged, thus significantly improving the viewing angle characteristics and preventing color cast at large angles.

[0035] 3. ACEL is a high-field light source, not a point light source. In related technologies, the concentrated blue sub-pixel 11 has an electric field concentrated within the strip, tending to be brighter in the center and darker at the edges. However, the surrounding blue sub-pixel 11 in this application has a shorter electric field path, a more symmetrical distribution, and more uniform brightness, avoiding localized over-brightness or breakdown.

[0036] IV. Higher pixel aperture ratio, enabling higher pixel density. The wraparound structure allows R+G (red + green) to be placed in a compact central area, while the blue sub-pixel 11 is distributed along the pixel boundary without additionally occupying the total pixel width. Therefore, with the same physical size, the pixel density is higher.

[0037] 5. More stable white balance dynamics. ACEL's blue light response and attenuation characteristics differ from OLED. When surrounded by blue light, each micro-area has RGB (three-color light) components, so even with slight fluctuations in brightness, the overall white balance remains stable.

[0038] Please see Figure 1 and Figure 3 In some embodiments, the area of ​​the blue sub-pixel 11 is larger than the area of ​​the first sub-pixel 12, and the area of ​​the blue sub-pixel 11 is larger than the area of ​​the second sub-pixel 13; or, the first sub-pixel 12 is a green sub-pixel, and the second sub-pixel 13 is a red sub-pixel; or, the first sub-pixel 12 is a red sub-pixel, and the second sub-pixel 13 is a green sub-pixel.

[0039] The increased area of ​​the blue sub-pixel 11 also means a reduction in the luminous load per unit area at the same current density, thereby further extending the lifespan of the blue sub-pixel 11. By making the area of ​​the blue sub-pixel 11 larger than that of the first sub-pixel 12 and the second sub-pixel 13, specifically, the luminous area of ​​the blue sub-pixel 11 can reach twice that of the red and green sub-pixels, ensuring effective white balance even under low AC electroluminescence brightness. The first sub-pixel 12 can be a green sub-pixel and the second sub-pixel 13 a red sub-pixel, or the first sub-pixel 12 can be a red sub-pixel and the second sub-pixel 13 a green sub-pixel; both configurations can achieve a compact arrangement of red, green, and blue pixels.

[0040] Please see Figure 5 In some embodiments, the display panel 1000 includes a driving backplate 2 and a pixel defining layer 3 disposed on the driving backplate 2, the pixel defining layer 3 defining a pixel space, and also includes a pixel structure 100 of any of the above schemes, the pixel structure 100 being disposed within the pixel space.

[0041] The driving backplate 2 provides driving signals, and the pixel defining layer 3 is disposed on the driving backplate 2 to define the light-emitting area of ​​each sub-pixel. The pixel space defined by the pixel defining layer 3 provides accommodating space 111 for the light-emitting area of ​​each sub-pixel. The pixel structure 100 is disposed within the pixel space, and each sub-pixel is precisely arranged under the definition of the pixel defining layer 3. By integrating the above-mentioned pixel structure 100 into the display panel 1000, the display panel 1000 has a larger light-emitting area of ​​the blue sub-pixel 11 at the same resolution, and the lifespan of the blue sub-pixel 11 is effectively extended, thereby improving the overall service life of the display panel 1000. Since the display panel 1000 has all the technical solutions of any embodiment of the above-mentioned pixel structure 100, it has at least all the beneficial effects brought by all the above-mentioned technical solutions, which will not be described in detail here.

[0042] Please see Figure 5 and Figure 6 In some embodiments, the pixel space includes a blue pixel space, and the display panel 1000 further includes a first electrode layer 4 and a second electrode layer 5 disposed at a relative interval in the blue pixel space, with blue sub-pixels 11 filling the gap between the first electrode layer 4 and the second electrode layer 5. The blue sub-pixels 11 include a blue fluorescent material layer 102, which is ZnS:Ag,Cl.

[0043] The blue pixel space is the light-emitting region corresponding to the blue sub-pixel 11 in the pixel-defining layer 3. The first electrode layer 4 and the second electrode layer 5 are disposed at a distance from each other in the blue pixel space, forming a gap between them. The blue sub-pixel 11 fills the gap between the first electrode layer 4 and the second electrode layer 5. The blue sub-pixel 11 includes a blue fluorescent material layer 102, and the material of the blue fluorescent material layer 102 is ZnS:Ag,Cl.

[0044] The blue fluorescent material layer 102 is made of ZnS:Ag,Cl, meaning that the blue fluorescent material layer 102 is made of the blue fluorescent material ZnS:Ag,Cl. Monochlorinated zinc sulfide (ZnS:Cl) can achieve blue-band emission through chlorine impurities inducing lattice donor and acceptor defects. Its emission originates from lattice defect recombination rather than characteristic activated ion energy level transitions. It suffers from drawbacks such as a wide emission spectrum, poor color purity, low luminous efficiency, high sensitivity to fabrication processes, and insufficient thermal and irradiation stability, making it difficult to directly use as a high-color-purity blue fluorescent unit for display devices. This embodiment uses a silver-chlorine co-doped system ZnS:Ag,Cl, where Ag... + As a luminescent activation center, Cl - It acts as a charge compensation and fluxing agent, and can produce high-performance zinc sulfide-based blue light.

[0045] In other embodiments, copper-doped zinc sulfide (ZnS:Cu) or silver-doped zinc sulfide (ZnS:Ag) may also be used. Conventional bulk zinc sulfide copper-doped ZnS:Cu fluorescent materials, under conventional high-temperature sintering conditions, Cu... +The primary substitution of Zn sites in the crystal lattice forms substituted copper luminescent centers, corresponding to green emission in the 510-530 nm range, making it a well-known green fluorescent material in the field. However, under specific preparation conditions, such as extremely low copper doping, sintering in a reducing atmosphere, and the absence of co-activating impurities like chlorine and aluminum, the proportion of interstitial copper luminescent centers in the system increases, producing blue emission in the 440 nm-460 nm band. However, under these conditions, the material mostly exhibits a dual-broadband emission characteristic with both blue and green emission bands coexisting, making it difficult to completely eliminate the green luminescent component and obtain high-purity monochromatic blue light output. Therefore, if ZnS:Cu is used as a blue fluorescent unit, specific limitations need to be placed on process parameters such as copper doping concentration and sintering atmosphere to ensure that interstitial copper luminescent centers dominate, thus achieving blue-band emission output.

[0046] Regarding the preparation of ZnS:Cu blue phosphor: A zinc sulfide matrix can be used, with the Cu doping molar fraction controlled at 0.005-0.02 mol%, and no chlorine source co-doping. Sintering is carried out at 1050℃-1150℃ for 2-4 hours under a nitrogen-hydrogen reducing atmosphere. The resulting powder contains both blue and a small amount of green luminescent components, with the main emission peak located at 448 nm. All of the above materials are inorganic phosphors, possessing excellent resistance to high and low temperatures, moisture, and UV aging. The phosphor can be dispersed in an organic medium (cyanoethyl cellulose / epoxy). Under an AC high-voltage electric field, such as an AC driving voltage of 30V~300V and 50kHz~20kHz, electrons inside the phosphor are accelerated by the strong field, colliding and exciting the luminescent centers to produce radiative emission. Using the above inorganic phosphor materials to replace traditional organic blue luminescent materials can avoid carrier injection-type aging problems, and the lifetime of blue units can be significantly improved.

[0047] Please see Figure 5 In some embodiments, the display panel 1000 further includes an insulating layer 8 and isolation pillars 103 disposed on the pixel limiting layer 3. The insulating layer 8 covers the isolation pillars 103 corresponding to the blue pixel space and the surface of the pixel limiting layer 3. The edges of the first electrode layer 4 and the second electrode layer 5 are respectively connected to the insulating layer 8.

[0048] It should be noted that the composite electrode of this application includes a first electrode layer 4, a second electrode layer 5, and a composite light-emitting layer 10 disposed between the first electrode layer 4 and the second electrode layer 5. The composite light-emitting layer 10 may be the blue sub-pixel 11 in this application. The blue sub-pixel 11 is a blue fluorescent material layer 102 made of blue fluorescent material. Of course, the composite light-emitting layer 10 may also include a mixture of blue sub-pixel 11 and insulating material 101. Those skilled in the art can make the configuration according to actual needs.

[0049] Specifically, the isolation pillar 103 adopts an inverted trapezoidal or regular trapezoidal structure and is disposed on the pixel limiting layer 3 between the blue sub-pixel 11 and the adjacent red sub-pixel, and between the blue sub-pixel 11 and the green sub-pixel. This serves to create a natural break during the deposition of the second electrode layer 5 (cathode), preventing the cathode from bridging adjacent sub-pixel areas. The insulating layer 8 can be formed using an atomic layer deposition process, and its material is Al2O3 / SiN. x The composite insulating layer 8 has a thickness of 1μm to 2μm and a withstand voltage of ≥120V. This insulating layer 8 completely covers the top surface and sidewalls of the isolation pillar 103 corresponding to the blue pixel space, as well as the surface of the exposed pixel limiting layer 3 around the isolation pillar 103, thereby forming a complete insulating wrapping structure around the composite electrode.

[0050] Regarding the electrode connection, the edge of the first electrode layer 4 (anode) extends below the insulating layer 8 and overlaps with it; the edge of the second electrode layer 5 (cathode) breaks at the isolation post 103 and extends to the upper part of the insulating layer 8, overlapping with it. In other words, the first electrode layer 4 and the second electrode layer 5 are roughly connected on opposite sides of the insulating layer 8. This connection structure allows the insulating layer 8 not only to act as a physical separator, isolating the first electrode layer 4 and the second electrode layer 5, but also to be directly connected in series between the edge paths of the anode and cathode. This forces the AC-driven blue sub-pixel 11 to be electrically isolated from the DC-driven red and green sub-pixels, ensuring that the high-voltage AC signal cannot creep along the electrode edge into the DC region, providing a basic insulating substrate for the subsequent retaining wall 7 structure.

[0051] Please see Figure 7 In some embodiments, the display panel 1000 further includes a barrier 7, which includes a top sub-barrier 72 and a bottom sub-barrier 71. The bottom sub-barrier 71 is attached to the side of the first electrode layer 4 away from the second electrode layer 5, and the top sub-barrier 72 is attached to the side of the second electrode layer 5 away from the first electrode layer 4. The top sub-barrier 72 is connected to the insulating layer 8.

[0052] In this embodiment, the barrier 7 adopts a double-layer structure, consisting of a bottom sub-barrier 71 and a top sub-barrier 72. The barrier 7 is only set in the interval area between the red sub-pixel and the blue sub-pixel 11, and between the green sub-pixel and the blue sub-pixel 11, and is not set in the non-display area.

[0053] The specific configuration is as follows: the bottom sub-baffle 71 is attached to the side of the first electrode layer 4 (anode) away from the second electrode layer 5 (cathode), i.e., below the edge of the anode, with a width 2-3 μm greater than the anode width and a height of 2-3 μm; the top sub-baffle 72 is attached to the side of the second electrode layer 5 (cathode) away from the first electrode layer 4 (anode), i.e., above the edge of the cathode, with a width covering the cathode edge 1-2 μm and a height of 1-2 μm. This creates a stepped drop in the vertical direction, wider at the bottom and narrower at the top. Furthermore, the connection between the top sub-baffle 72 and the insulating layer 8 is as follows: the sidewall of the top sub-baffle 72 is in close contact and connected to the insulating layer 8 covering the surface of the isolation pillar 103. This connection allows the stepped baffle 7 and the insulating layer 8 to together form a ring-shaped insulating barrier. This achieves AC / DC isolation, allowing the composite electrode, i.e., the blue sub-pixel 11, to be driven by AC, while the red and green sub-pixels are driven by DC, without interference. The reasons why the barrier wall 7 and the insulation layer 8 in this application can better achieve AC / DC isolation are explained in detail below: First, the creepage distance is extended and the lateral electric field is interrupted. Because the bottom sub-barrier 71 is wider than the anode and the top sub-barrier 72 is wider than the cathode, creating a drop between them, and the top sub-barrier 72 is connected to the insulating layer 8 covering the isolation pillar 103, the surface discharge path (creep path) from the AC-driven blue ACEL sub-pixel (high-voltage end) to the DC-driven red or green sub-pixel (low-voltage sensitive end) is greatly extended. When the AC high-voltage electric field attempts to propagate laterally, it must sequentially pass through the sidewall of the bottom sub-barrier 71, the step of the top sub-barrier 72, and the surface of the insulating layer 8 connected to the top barrier 7. This tortuous path significantly weakens the electric field coupling strength.

[0054] Second, a "voltage-resistant buffer layer" is constructed for AC high voltage. This is due to the insulation layer 8 (Al2O3 / SiN). x The insulating layer 8 covers the isolation pillar 103 and connects to the top sub-barrier 72, while the bottom sub-barrier 71 is attached to the anode. When the ACEL driving circuit applies a high-voltage AC current of ≥120V, the high-voltage electric field is first confined within the space enclosed by the insulating layer 8 and the stepped barrier 7. The insulating layer 8, with its high withstand voltage of ≥120V, directly bears the high voltage difference between the anode and cathode, preventing the ACEL high-voltage electric field from vertically or laterally breaking down into adjacent red and green OLED functional layers (such as the light-emitting layer or hole transport layer). The presence of the stepped bottom sub-barrier 71 further prevents the high-voltage electric field from directly creeping along the anode edge into the organic functional material of the OLED.

[0055] Third, physical isolation of the driving domain is achieved. The top sub-block 72 and the insulating layer 8 form a continuous inorganic / organic composite rigid shielding layer on the side of the blue pixel. Together with the bottom sub-block 71 located on the anode side, this at least partially covers the electrode edge and light-emitting sidewall of the blue ACEL sub-pixel. As a result, the electric field environment of the DC-driven red and green sub-pixel regions is completely physically isolated from the electric field environment of the AC-driven blue ACEL sub-pixel region, effectively eliminating AC / DC electric field crosstalk and ensuring that the sub-pixels of the two different driving modes can work independently and stably under folding screen bending or high-voltage driving conditions.

[0056] Please see Figure 5 or Figure 7 In some embodiments, an insulating dielectric layer 9 is provided on the side of the first electrode layer 4 facing the second electrode layer 5 and the side of the second electrode layer 5 facing the first electrode layer 4. The two insulating dielectric layers 9 are respectively on opposite sides of the blue fluorescent material layer 102.

[0057] An insulating dielectric layer 9 is disposed on the side of the first electrode layer 4 facing the second electrode layer 5 and the side of the second electrode layer 5 facing the first electrode layer 4. The two insulating dielectric layers 9 are in contact with the opposite sides of the blue fluorescent material layer 102. The insulating dielectric layer 9 is a high dielectric constant material layer, such as barium titanate composite polymer, with a dielectric constant greater than or equal to 30 and an insulation resistivity greater than or equal to 10¹² Ω·cm. The insulating dielectric layer 9 is used to enhance the electric field, prevent short circuits, and withstand voltage, while further blocking the current conduction between the upper and lower electrodes, ensuring that the alternating electric field passes perpendicularly through the light-emitting layer to achieve light emission.

[0058] Please see Figure 8 and Figure 9 In some embodiments, the first electrode layer 4 and the second electrode layer 5 are both made of carbon nanofibers, silver nanowires, adhesives and coupling agents, and both the first electrode layer 4 and the second electrode layer 5 have a three-dimensional porous honeycomb structure 6.

[0059] The first electrode layer 4 and the second electrode layer 5 are both conductive layers composed of carbon nanofibers, silver nanowires, binders, and coupling agents. Carbon nanofibers provide three-dimensional skeletal support and basic conductivity, while also improving structural flexibility and heat dissipation. Silver nanowires (AgNW) are uniformly dispersed between the carbon nanofibers, filling the gaps, reducing sheet resistance, improving conductivity uniformity, and preventing grain boundary defects. The binder firmly bonds the carbon nanofibers and silver nanowires, while also supplementing conductivity, improving structural stability and light transmittance, and preventing electrode detachment. The coupling agent enhances the interfacial adhesion between the electrode and the subsequent light-emitting layer and protective layer, preventing film peeling. The hybrid layer at least partially fills the gap between the first electrode layer 4 and the second electrode layer 5, and may also partially fill the pores of the first electrode layer 4 and the second electrode layer 5. The insulating material 101 blocks current conduction between the first electrode layer 4 and the second electrode layer 5, and also serves as the electric field medium for ACEL luminescence, ensuring that the alternating electric field passes perpendicularly through the light-emitting layer to achieve luminescence. The blue fluorescent material is excited to light under an alternating high-voltage electric field. In related technologies, traditional OLED blue light-emitting materials are small organic molecules with high exciton energy. During long-term operation, they are prone to photo-oxidation, conjugated chain breakage, and carrier loss, resulting in a lifespan typically only one-fifth to one-third that of red and green pixels. This is a key bottleneck restricting the overall lifespan of display panels. While traditional ACEL devices use highly stable inorganic phosphors, their ITO (Indium Tin Oxide) transparent electrodes suffer from numerous grain boundaries, uneven electric field distribution, and susceptibility to breakdown under strong localized fields. This makes the devices prone to breakdown failure under high electric fields. Furthermore, ITO electrodes have poor flexibility and are prone to cracking when bent; repeated bending can directly lead to device failure. Additionally, the phosphors in the ACEL light-emitting layer tend to agglomerate, and the concentrated electric field at these agglomeration sites accelerates material aging. Low light extraction efficiency forces an increase in driving voltage, which further accelerates material degradation. Any of these problems significantly shortens the device's lifespan.

[0060] In some embodiments, the pore size of the three-dimensional porous honeycomb structure 6 is 150 nm to 700 nm, and the porosity of the three-dimensional porous honeycomb structure 6 is 60% to 75%.

[0061] The first electrode layer 4 and the second electrode layer 5 are made of CFM (Conductive Foldable Metamaterial), which possesses high conductivity and excellent mechanical folding durability. The three-dimensional porous honeycomb structure 6 is a three-dimensional porous honeycomb structure with hexagonal honeycomb units. Adjacent honeycomb units are interconnected, forming a continuous three-dimensional conductive network and pore channels, without isolated honeycombs or conductive breaks. The honeycomb pores are uniformly distributed, penetrating the entire electrode layer, without local pore aggregation or voids, ensuring uniform phosphor filling and electric field distribution. The honeycomb pore size is adapted to the diameter of the blue fluorescent material particles, enabling single-pore, single-particle dispersion and preventing phosphor agglomeration. High porosity balances phosphor filling, uniform electric field distribution, and light extraction. By setting the electrode layer as a three-dimensional porous honeycomb structure 6, electrode grain boundary and tip discharge can be eliminated, improving the uniformity of electric field distribution, eliminating local strong fields, further reducing the ACEL driving voltage, and preventing device breakdown. Simultaneously, the honeycomb porous structure possesses stress dispersion characteristics; when the panel is bent, rolled, or folded, the honeycomb pores can undergo slight deformation to buffer stress, preventing film cracking and electrode detachment. The honeycomb subwavelength structure can break the limitation of total internal reflection, converting the light guided inside the ACEL into front-emitting light, improving blue light extraction efficiency. In some specific embodiments, the pore size of the three-dimensional porous honeycomb structure 6 is 300nm to 500nm, and the porosity of the three-dimensional porous honeycomb structure 6 is 65% to 70%.

[0062] In some embodiments, carbon nanofibers account for 40% to 50%, silver nanowires account for 20% to 30%, adhesives account for 20% to 30%, and coupling agents account for 1% to 2%.

[0063] All percentages here refer to mass percentages. The carbon nanofibers used are single-walled carbon nanofibers with a diameter of 50 to 100 nm and a length of 5 μm to 10 μm; the silver nanowires have a diameter of 10 nm to 20 nm and a length of 1 μm to 3 μm; the binder is a 1.0 wt% to 1.5 wt% PEDOT:PSS aqueous solution. PEDOT:PSS is a high-molecular-weight conductive polymer composite material, its full name being poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate). Functionally, it is often used as a material with both conductive and adhesive properties; it can be understood as a conductive adhesive. The coupling agent used is APTES, i.e., 3-aminopropyltriethoxysilane. Through the above formulation design, the components work synergistically to form a composite electrode layer with high conductivity, excellent flexibility, and good light transmittance, adapting to the molding and multiple performance requirements of the three-dimensional porous honeycomb structure.

[0064] In some embodiments, the hybrid material layer further fills at least partially the pores of the three-dimensional porous honeycomb structure 6.

[0065] The insulating material 101 and the blue fluorescent material mixture in the hybrid material layer completely fill the honeycomb pores of the bottom electrode, forming a continuous and flat intermediate layer. This ensures that the conductive area of ​​the bottom electrode is completely encapsulated by the insulating-luminescent hybrid system, with no exposed conductive sites. The honeycomb pores of the top electrode are also filled with the insulating-luminescent hybrid slurry, further blocking the conductive path of the first electrode layer 4 and the second electrode layer 5. Through the above configuration, an integrated composite film layer of electrode-luminescent layer and insulating layer 8 is formed. The overall thickness of the film layer is reduced, improving the thinness of the panel. At the same time, the space between the upper and lower electrodes is completely filled by the hybrid system of high-dielectric insulating material 101 and luminescent material, and the upper and lower electrodes have no physical contact or conductive path, thus completely avoiding the risk of conduction from a structural perspective.

[0066] Please see Figure 5 In some embodiments, the pixel space further includes a red pixel space and a green pixel space. Red sub-pixels are disposed in the red pixel space layer, and green sub-pixels are disposed in the green pixel space layer. The red and green sub-pixels are driven by DC, and the blue sub-pixel 11 in the composite electrode is driven by AC.

[0067] The red subpixel is a red organic light-emitting diode (OLED), and the green subpixel is a green organic light-emitting diode (OLED). Both are driven by a low-voltage DC method, which is highly efficient and has a long lifespan in red and green light-emitting material systems and has been widely used and verified. The blue subpixel 11 uses an AC electroluminescent device, utilizing copper-doped or silver-doped zinc sulfide blue phosphors in the composite electrode to generate blue light emission through a high-field collisional excitation mechanism under an AC high-voltage electric field. AC electroluminescence is a high-field collisional luminescence, which does not require carrier injection. It relies on a strong alternating electric field to accelerate the intrinsic electrons of the material to collide with the luminescence centers to generate excitation and ionization, followed by de-excitation. It does not have the carrier injection-type aging problem. The luminescent material is a composite system of inorganic phosphor and high dielectric, exhibiting excellent stability.

[0068] By replacing the shorter-lifespan blue organic light-emitting diodes (OLEDs) with longer-lifespan blue alternating current (AC) luminescent devices (ECDs), while retaining red and green OLEDs, a hybrid pixel architecture combining red-green OLEDs and blue AC luminescence is formed. In this architecture, red and green subpixels are driven by DC, while blue subpixel 11 is driven by AC. However, when low-voltage DC driving and high-voltage AC driving coexist in the same display panel 1000, without the aforementioned baffle 7 and insulating layer 8, the high-voltage AC electric field will cause crosstalk to the DC driving area through the coupling path between adjacent film layers. This can lead to high-voltage breakdown of red and green subpixels, rendering them unable to function properly, or even causing the entire display panel 1000 to fail. When the baffle 7 and insulating layer 8 are placed at the boundary between the red pixel space layer and the green pixel space layer and the blue pixel space layer, the high-voltage AC electric field is effectively shielded by the baffle 7 and insulating layer 8. The low-voltage DC driving environment of the red and green subpixels is unaffected, and the high-voltage AC driving of the blue subpixel 11 can also operate independently and stably.

[0069] Through the synergistic cooperation of the above structural design and driving method, the red and green sub-pixels can take advantage of the high efficiency of organic light-emitting diode (OLED) materials in the red and green light bands, while the blue sub-pixel 11 can avoid the inherent defect of short blue light lifespan of OLEDs by utilizing the excellent stability of AC electroluminescent inorganic phosphor materials. Each of the three color sub-pixels employs the optimal luminescent material system and driving method. While ensuring display quality, the lifespan of the blue sub-pixel 11 can be increased by eight to ten times compared to traditional OLED blue pixels, thus solving the long-standing bottleneck of blue light lifespan that has limited the overall service life of OLED display panels 1000. Furthermore, since AC electroluminescence is a high-field collisional emission mechanism, its luminescent material is a composite system of inorganic phosphor and high-dielectric dielectric, which is insensitive to water, oxygen, and temperature changes. It possesses excellent resistance to high and low temperatures, humidity, and UV aging, making it suitable for various demanding applications such as automotive curved displays, outdoor intelligent signage, and industrial displays, breaking through the application limitations of traditional OLED display panels 1000.

[0070] Reference Figure 10 , Figure 10 This is a schematic flowchart illustrating the preparation method of the composite electrode according to the first embodiment of the present invention. The preparation method of the composite electrode includes the following steps: S100: Carbon nanofibers are dispersed in deionized water to form a carbon nanofiber dispersion; and silver nanowires are dispersed in ethanol to form a silver nanowire dispersion.

[0071] In this step, carbon nanofibers are dispersed in deionized water and ultrasonically dispersed to form a carbon nanofiber dispersion with a concentration of 5 mg / mL to 8 mg / mL. Silver nanowires are dispersed in ethanol and ultrasonically dispersed to form a silver nanowire dispersion with a concentration of 1 mg / mL to 2 mg / mL. By preparing two dispersions separately, it is ensured that the carbon nanofibers and silver nanowires are fully dispersed, avoiding agglomeration caused by direct mixing, and laying the foundation for the subsequent formation of a uniform composite slurry.

[0072] S200: Mix carbon nanofiber dispersion and silver nanowire dispersion at a preset volume ratio, add binder and coupling agent and mix evenly to form composite slurry.

[0073] In this step, carbon nanofiber dispersions and silver nanowire dispersions are mixed at a volume ratio of 4:2. A PEDOT:PSS aqueous solution is added as a binder, comprising 30% of the total system volume. Then, APTES coupling agent is added, comprising 1.5% of the total system mass. The mixture is stirred to form a homogeneous CFM composite slurry. Carbon nanofibers provide three-dimensional skeletal support and basic conductivity, while silver nanowires fill the gaps between carbon nanofibers to reduce surface resistivity. The binder firmly bonds the carbon nanofibers and silver nanowires, and the coupling agent enhances subsequent interfacial adhesion. Through the above formulation and mixing process, the components work synergistically to form a composite slurry with high conductivity, excellent flexibility, and good light transmittance.

[0074] S300: Apply the composite slurry to the interface and let it stand.

[0075] In this step, the composite slurry is coated onto the interface surface using a doctor blade, with the coating thickness controlled between 60 and 180 nm, followed by resting at room temperature. The doctor blade coating method allows for precise control of the film thickness, ensuring the uniformity of the electrode layer thickness. Resting at room temperature allows the solvent in the composite slurry to evaporate slowly, initially shaping the film and avoiding the adverse effects of high-temperature treatment on material properties.

[0076] S400: Imprinting forms a three-dimensional porous honeycomb structure 6.

[0077] In this step, a template imprinting method is used to imprint the settled film layer. The template is a regular hexagonal porous structure with a pore size of 150 nm to 700 nm, thereby forming a three-dimensional porous honeycomb structure 6 on the film layer. The template imprinting method is simple, has good repeatability, and can precisely control the honeycomb pore size and porosity. The pore size of the three-dimensional porous honeycomb structure 6 is adapted to the diameter of the subsequently filled fluorescent material particles, which can achieve single-pore single-particle dispersion and avoid phosphor agglomeration; the high porosity balances phosphor filling, uniform electric field distribution, and light extraction. Through this step, the electrode layer forms a three-dimensional interconnected porous honeycomb conductive network.

[0078] S500: Fold the embossed material into shape.

[0079] In this step, the imprinted film is annealed. Utilizing the thermal shrinkage properties of carbon nanofibers and PEDOT:PSS, micro-folds of 15 to 30 degrees are formed at the edges of the honeycomb cells. The annealing temperature and time can be selected according to the material properties, allowing for controllable micro-fold angles at the edges of the honeycomb cells under thermal shrinkage. This folding design ensures that each hexagonal honeycomb cell has a micro-fold angle at its edge. When the panel is bent, rolled, or folded, the honeycomb pores can undergo slight deformation to buffer stress, further enhancing structural flexibility and stress dispersion capabilities, and preventing film cracking and electrode detachment. The folded film is then UV-cured to obtain the composite electrode layer, completing the fabrication of the composite electrode.

[0080] In the above embodiments of the present invention, a composite electrode layer with a three-dimensional porous honeycomb structure 6 and micro-folded angles at the edges of the honeycomb units can be prepared. This method is simple, highly controllable, and the steps are closely interconnected, making it suitable for mass production. After the prepared composite electrode replaces the traditional ITO electrode, the flexible network structure of carbon nanofibers and silver nanowires eliminates grain boundaries, unifies the electric field, and prevents breakdown. The porous structure binds the phosphor to prevent aggregation, the honeycomb structure improves light extraction efficiency and reduces driving voltage, the composite structure dissipates heat to prevent thermal aging, and the micro-folded structure buffers stress to prevent cracking. The synergistic effect of these multiple effects significantly improves the lifespan of the blue ACEL units, thereby effectively extending the overall service life of the display panel 1000. Through the above steps, a composite light-emitting layer 10 with a three-dimensional porous honeycomb structure 6 can be prepared. This method is simple, highly controllable, and suitable for mass production.

[0081] The above are merely exemplary embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A pixel structure, characterized in that, The system comprises multiple pixels arranged in an array. Each pixel includes a blue sub-pixel, a first sub-pixel, and a second sub-pixel. Projected onto a horizontal plane, the first sub-pixel has a concave rounded corner. The blue sub-pixel is racetrack-shaped and includes two elongated horizontal strips and a vertical strip connecting the two horizontal strips. The two horizontal strips and the vertical strip enclose a receiving space. The two ends of the horizontal strips are provided with first rounded ends that match the rounded corners. The second sub-pixel is disposed within the receiving space and has at least one second rounded end. The vertical strip is provided with an arc-shaped groove that matches the second rounded end.

2. The pixel structure according to claim 1, characterized in that, The number of vertical strips is one, and one vertical strip is connected to the same end of two horizontal strips. The two horizontal strips and one vertical strip enclose the accommodating space with an opening. The second sub-pixel is arranged adjacent to the first sub-pixel.

3. The pixel structure according to claim 1, characterized in that, There are two vertical bars, and the two horizontal bars and the two vertical bars enclose the enclosing space. There are two second arc ends, and each vertical bar is provided with an arc-shaped groove that mates with the second arc end.

4. The pixel structure according to any one of claims 1 to 3, characterized in that, The area of ​​the blue sub-pixel is larger than the area of ​​the first sub-pixel, and the area of ​​the blue sub-pixel is larger than the area of ​​the second sub-pixel; or, The first sub-pixel is a green sub-pixel, and the second sub-pixel is a red sub-pixel; or, The first sub-pixel is a red sub-pixel, and the second sub-pixel is a green sub-pixel.

5. A display panel, characterized in that, The display panel includes a driving backplate and a pixel defining layer disposed on the driving backplate, the pixel defining layer defining a pixel space, and further includes a pixel structure as described in any one of claims 1 to 4, the pixel structure being disposed within the pixel space.

6. The display panel according to claim 5, characterized in that, The pixel space includes a blue pixel space, and the display panel further includes a first electrode layer and a second electrode layer disposed at a relative interval in the blue pixel space. The blue sub-pixels fill the gap between the first electrode layer and the second electrode layer, and the blue sub-pixels include a blue fluorescent material layer. The material of the blue fluorescent material layer is ZnS:Ag,Cl.

7. The display panel according to claim 6, characterized in that, An insulating dielectric layer is provided on the side of the first electrode layer facing the second electrode layer, and on the side of the second electrode layer facing the first electrode layer. The two insulating dielectric layers are respectively on opposite sides of the blue fluorescent material layer.

8. The display panel according to claim 6, characterized in that, The display panel further includes an insulating layer and isolation pillars disposed on the pixel defining layer. The insulating layer covers the isolation pillars and the surface of the pixel defining layer corresponding to the blue pixel space. The edges of the first electrode layer and the second electrode layer are respectively connected to the insulating layer.

9. The display panel according to claim 8, characterized in that, The display panel further includes a barrier wall, which includes a top sub-barrier wall and a bottom sub-barrier wall. The bottom sub-barrier wall is attached to the side of the first electrode layer opposite to the second electrode layer, and the top sub-barrier wall is attached to the side of the second electrode layer opposite to the first electrode layer. The top sub-barrier wall is connected to the insulating layer.

10. The display panel according to claim 6, characterized in that, Both the first electrode layer and the second electrode layer are made of carbon nanofibers, silver nanowires, binders and coupling agents, and both the first electrode layer and the second electrode layer have a three-dimensional porous honeycomb structure. The pore size of the three-dimensional porous honeycomb structure is 150 nm to 700 nm, and the porosity of the three-dimensional porous honeycomb structure is 60% to 75%; and / or, The carbon nanofibers account for 40% to 50%, the silver nanowires account for 20% to 30%, the adhesive accounts for 20% to 30%, and the coupling agent accounts for 1% to 2%.

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