Display panel and display device

Abstract

This application relates to a display panel and a display device, belonging to the field of display technology. The display panel of this application includes a display substrate, a first electrode, a color resist structure, and a second electrode. The display substrate includes multiple pixel units. The first electrode is disposed on one side of the display substrate. The color resist structure covers the side of the first electrode facing away from the display substrate, and the color resist structure includes alternately arranged color-changing portions and color resist portions, with the color-changing portions located between two adjacent color resist portions. The second electrode is disposed on the side of the color-changing portion facing away from the display substrate. When the display panel is not stretched, the second electrode and the color-changing portion remain in contact, making the entire color-changing portion black. When the display panel is stretched, the second electrode stretches and separates from both ends of the color-changing portion in the length direction, making the separated color-changing portion transparent. The technical solution disclosed in this application can compensate for the brightness loss caused by the increase in cathode resistance during stretching and improve the screen brightness under stretched conditions.

Description

Technical Field

[0001] This application relates to the field of displays, and more particularly to a display panel and display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) possess advantages such as surface light source, energy efficiency, flexibility, and ultra-thinness, and their mass production technology is becoming increasingly mature. Flexible and stretchable displays, due to their variable display size, can adapt to various application scenarios and have become an important development direction for next-generation display devices. However, in existing stretchable display products, when the screen is stretched, the cathode is subjected to stretching, leading to an increase in resistance. This voltage drop causes a decrease in current density, resulting in display abnormalities such as localized dark spots or black spots, severely impacting the viewing experience. Simultaneously, the increased pixel pitch after stretching reduces the proportion of luminous area per unit area, resulting in a decrease in overall screen brightness. Therefore, how to compensate for the brightness loss caused by the increased cathode resistance during stretching and improve screen brightness in the stretched state has become an urgent problem to be solved. Summary of the Invention

[0003] This application provides a display panel and display device that can compensate for brightness loss caused by increased cathode resistance during stretching and improve screen brightness under stretched conditions.

[0004] In a first aspect, this application provides a display panel, including: The display substrate includes multiple pixel units arranged at intervals; The first electrode is disposed on one side of the display substrate; A color resist structure is provided on the side of the first electrode facing away from the display substrate. The color resist structure includes alternating color-changing portions and color resist portions. The color-changing portions are located between two adjacent color resist portions. Each color resist portion corresponds to a pixel unit. On a plane perpendicular to the height direction, the projection of the color resist portion covers the projection of the corresponding pixel unit. The second electrode is disposed on the side of the color-changing portion away from the display substrate; the first electrode and the second electrode are used to apply voltage to the color-changing portion; When the display panel is not stretched, the second electrode remains in contact with the entire color-changing part, making the entire color-changing part black; when the display panel is stretched, the second electrode stretches and separates from both ends of the color-changing part in the length direction, making the color-changing part at the separation point transparent.

[0005] In some embodiments, the display panel further includes a planarization layer located on the side of the color resist structure opposite to the display substrate, the planarization layer having a plurality of spaced-apart gaps located at both ends of the color-changing portion in the length direction; Wherein, a portion of the second electrode is housed within the gap. When the display panel is not stretched, the second electrode housed within the gap remains in contact with both ends of the color-changing portion in the length direction. When the display panel is stretched, the second electrode housed within the gap stretches and separates from both ends of the color-changing portion in the length direction, making the color-changing portion at the separation point transparent.

[0006] In some embodiments, the planarization layer includes alternating first planar portions and second planar portions, the first planar portions being located between two adjacent second planar portions; wherein, the gap is present between the first planar portions and the second planar portions, the gap being located at the junction of the color resist portion and the color-changing portion, and on a plane perpendicular to the height direction, the projection of the gap simultaneously covers the end of the color resist portion and the end of the color-changing portion.

[0007] In some embodiments, the second electrode includes: The main electrode portion covers the side of the color-changing portion away from the display substrate, and the first flat portion covers the side of the main electrode portion away from the display substrate; An auxiliary electrode portion covers the side of the second flat portion that faces away from the substrate; The transition electrode section is connected to the main electrode section and the auxiliary electrode section at both ends, and the transition electrode section is located within the gap.

[0008] In some embodiments, the transition electrode portion has an inclined angle with the height direction; When the display panel is stretched, the transition electrode portion stretches, the tilt angle increases, and it separates from the color-changing portion at both ends in the length direction.

[0009] In some embodiments, the pixel unit includes an anode, an organic light-emitting functional layer, and a cathode arranged in sequence, wherein the cathode is connected in parallel with the second electrode; and wherein the resistance of the second electrode decreases when it is stretched.

[0010] In some embodiments, the second electrode is formed of a conductive folded metamaterial; wherein the conductive folded metamaterial exhibits increased resistance when compressed and decreased resistance when stretched.

[0011] In some embodiments, the display substrate further includes: Substrate; A pixel definition layer protrudes from one side of the substrate and forms a plurality of spaced pixel accommodating regions, wherein the pixel unit is disposed within the pixel accommodating region; An encapsulation layer covers the side of the pixel unit facing away from the substrate, and the side of the pixel definition layer facing away from the substrate.

[0012] In some embodiments, the display panel further includes: A flexible substrate is disposed on the side of the encapsulation layer opposite to the substrate, and the first electrode is disposed on the side of the flexible substrate opposite to the display substrate; An upper substrate covers the side of the first flat portion opposite to the display substrate and the side of the auxiliary electrode portion opposite to the display substrate, and is disposed across the gap.

[0013] Secondly, this application provides a display device, including the display panel as described above.

[0014] The technical solutions provided in this application have the following advantages compared with the prior art: The display panel provided in this application embodiment, when the display panel is in an unstretched state, the second electrode and the color-changing part remain in contact as a whole, and the first electrode and the second electrode jointly apply voltage to the color-changing part, making the color-changing part black as a whole; at this time, the color-changing part replaces the traditional black matrix to play an optical shielding role, which can effectively absorb ambient light and prevent light crosstalk between adjacent pixel units, thereby ensuring high contrast and color purity of the displayed image and improving the display quality under normal conditions; When the display panel is stretched, the second electrode is stretched, and the portion within the gap deforms, separating from the two ends of the color-changing part along its length. The separated color-changing part changes from black to transparent due to the loss of the electric field. This change makes the non-light-emitting areas, previously blocked by the color-changing part which acts as a black matrix, transparent, thereby increasing the effective light-emitting aperture ratio of the pixel unit. This compensates for the decrease in light-emitting area caused by stretching, significantly improving the overall brightness of the screen under stretched conditions. Simultaneously, this brightness compensation mechanism effectively masks localized dark spots or black spots caused by increased resistance of the cathode during stretching, improving display uniformity under stretched conditions and making the image performance more consistent and stable. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a schematic diagram of the structure of the display panel provided in an embodiment of this application; Figure 2 A schematic diagram of the structure of pixels in the folded area of ​​the display panel when it is not bent, as provided in an embodiment of this application. Figure 3 A schematic diagram of the structure of pixels in the folded area of ​​a display panel when bent, as provided in an embodiment of this application. Figure 4 This is a schematic diagram of the structure of the conductive folded metamaterial provided in the embodiments of this application; Figure 5 This is an enlarged schematic diagram of the conductive folded metamaterial provided in the embodiments of this application; Figure 6 This is a schematic diagram of the pixel spacing before and after stretching a display panel in the prior art.

[0019] Explanation of reference numerals in the attached figures: 10. Display substrate; 110. Pixel unit; 1101. Anode; 1102. Organic light-emitting functional layer; 1103. Cathode; 120. Substrate; 130. Pixel definition layer; 140. Encapsulation layer; 1401. Organic encapsulation layer; 1402. Inorganic encapsulation layer; 20. First electrode; 30. Color resist structure; 310. Color-changing part; 320. Color resist part; 40. Second electrode; 410. Main electrode section; 420. Auxiliary electrode section; 430. Transition electrode section; 50. Planarization layer; 510. Void; 520. First planarization section; 530. Second planarization section; 60. Flexible substrate; 70. Install the base plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0022] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0023] Organic light-emitting diodes (OLEDs) have become one of the mainstream technologies in the display field due to their outstanding advantages such as surface light source, cold light, energy saving, fast response speed, flexibility, ultra-thinness, and low cost, and their mass production technology is becoming increasingly mature. In recent years, flexible and stretchable displays have attracted widespread attention as a brand-new display form. Because their display size can be dynamically changed according to the usage scenario, they can be flexibly adapted to various applications, from wearable devices and foldable phones to large-screen TVs, and are regarded as an important development direction.

[0024] However, existing stretchable display products still face many technical bottlenecks in practical applications. On the one hand, when the screen is stretched, the cathode layer at the top of the device deforms, elongating its conductive path and reducing its cross-sectional area, leading to a significant increase in resistance. This increased resistance causes a rise in voltage drop across the current loop, resulting in uneven current density distribution across pixel units and a decrease in overall current density. This, in turn, weakens the luminous intensity in localized areas, creating dark spots or even black spots, severely degrading the user's viewing experience. On the other hand, such as... Figure 6 As shown, when the screen is stretched, the physical spacing between pixel units is increased, the number of pixels per unit area decreases, and the effective light-emitting area ratio of each pixel unit also declines, resulting in a significant decrease in the overall brightness of the screen, making the picture darker and further affecting the visibility of the display effect.

[0025] Therefore, how to effectively compensate for the brightness loss caused by the increase in cathode resistance during screen stretching, and at the same time improve the screen brightness in the stretched state, so as to overcome the problems of dark spots, black spots and overall brightness reduction in the existing technology, has become a technical problem that urgently needs to be solved by those skilled in the art.

[0026] In response to the above technical problems, such as Figures 1-3 As shown, this application embodiment provides a display panel, including a display substrate 10, a first electrode 20, a color resist structure 30, and a second electrode 40. The display substrate 10 includes a plurality of pixel units 110 arranged at intervals. Each pixel unit 110 includes an anode 1101, an organic light-emitting functional layer 1102, and a cathode 1103 arranged in sequence. The first electrode 20 is disposed on one side of the display substrate 10. The color resist structure 30 covers the side of the first electrode 20 away from the display substrate 10. The color resist structure 30 includes alternating color-changing portions 310 and color resist portions 320. The color-changing portions 310 are located between two adjacent color resist portions 320. Each part 320 corresponds to a pixel unit 110. On a plane perpendicular to the height direction, the projection of the color resist part 320 covers the projection of the corresponding pixel unit 110. The second electrode 40 is disposed on the side of the color-changing part 310 away from the display substrate 10. The first electrode 20 and the second electrode 40 are used to apply voltage to the color-changing part 310. When the display panel is not stretched, the second electrode 40 and the color-changing part 310 remain in contact, so that the entire color-changing part 310 is black. When the display panel is stretched, the second electrode 40 is stretched and separates from the two ends of the color-changing part 310 in the length direction, so that the color-changing part 310 at the separation point is transparent.

[0027] As can be seen from the above, when the display panel is in an unstretched state, the second electrode 40 and the color-changing part 310 remain in contact as a whole. The first electrode 20 and the second electrode 40 together apply voltage to the color-changing part 310, making the color-changing part 310 appear black as a whole. At this time, the color-changing part 310 replaces the traditional black matrix to play an optical shielding role, which can effectively absorb ambient light and prevent light crosstalk between adjacent pixel units 110, thereby ensuring high contrast and color purity of the displayed image and improving the display quality under normal conditions. When the display panel is stretched, the second electrode 40 is stretched, and the portion of it located within the gap 510 deforms, separating from the two ends of the color-changing portion 310 along its length. The color-changing portion 310 at the separation point changes from black to transparent due to the loss of the electric field. This change makes the non-light-emitting area, originally blocked by the color-changing portion 310 which acts as a black matrix, transparent, thereby increasing the effective light-emitting aperture ratio of the pixel unit 110, compensating for the decrease in light-emitting area caused by stretching, and significantly improving the overall brightness of the screen in the stretched state. Simultaneously, this brightness compensation mechanism effectively masks localized dark spots or black spots caused by the increased resistance of the cathode 1103 during stretching, improving display uniformity in the stretched state and making the image performance more consistent and stable.

[0028] It should be noted that, as Figure 1 As shown, the length direction is parallel to the X direction, and the height direction is parallel to the Z direction.

[0029] It should also be noted that the color-changing part 310 is formed of an electrochromic material, which undergoes an oxidation-reduction reaction when voltage is applied, exhibiting a black, opaque state; and reverts to a transparent, highly transparent state when the voltage is de-pressurized. Understandably, the first electrode 20 and the second electrode 40 are connected to different potentials, and the voltage difference between them controls the color state of the color-changing part 310; when the display panel is stretched, the second electrode 40 is elongated and separated from the two ends of the color-changing part 310 along its length, causing the separated ends of the color-changing part 310 to lose their electric field and become transparent.

[0030] It should also be noted that pixel unit 110 includes red pixel unit, green pixel unit, and blue pixel unit; the red pixel unit, green pixel unit, and blue pixel unit are arranged alternately in sequence to achieve full-color display. Each pixel unit 110 includes an anode 1101, an organic light-emitting functional layer 1102, and a cathode 1103 arranged in sequence, wherein the organic light-emitting functional layer 1102 emits light of the corresponding color (red pixel unit emits red light, green pixel unit emits green light, and blue pixel unit emits blue light); The color resist section 320 is formed of a color filter material and is used to select the color of the light emitted by the pixel unit 110. Specifically, the color resist section 320 includes a red color resist, a green color resist, and a blue color resist, corresponding to the red pixel unit, the green pixel unit, and the blue pixel unit, respectively. Each color resist section 320 corresponds one-to-one with its corresponding pixel unit 110, and on a plane perpendicular to the height direction, the projection of the color resist section 320 covers the projection of the corresponding pixel unit 110, so as to ensure that the light emitted by the pixel unit 110 only passes through the color resist section 320 of the corresponding color, avoid color crosstalk, and realize full-color display.

[0031] It should also be noted that the first electrode 20 is a flexible electrode, that is, it is formed of a conductive material with good flexibility and stretchability, which can maintain stable conductivity when the display panel is stretched, bent or deformed.

[0032] In some embodiments, the display panel further includes a planarization layer 50, which is located on the side of the color resist structure 30 away from the display substrate 10. The planarization layer 50 has a plurality of spaced gaps 510, which are located at both ends of the color-changing portion 310 in the length direction. A portion of the second electrode 40 is housed within the gap 510. When the display panel is not stretched, the second electrode 40 housed within the gap 510 remains in contact with both ends of the color-changing portion 310 in the length direction. When the display panel is stretched, the second electrode 40 housed within the gap 510 is stretched and separates from both ends of the color-changing portion 310 in the length direction, making the color-changing portion 310 at the separation point transparent.

[0033] By providing a planarization layer 50 on the side of the color resist structure 30 away from the display substrate 10, and forming multiple spaced gaps 510 on the planarization layer 50, the gaps 510 are located at both ends of the color-changing portion 310 in the length direction. A portion of the second electrode 40 is accommodated in the gaps 510 and is in a relaxed stacked state. When the display panel is not stretched, the portion of the second electrode 40 accommodated in the gaps 510 remains in contact with both ends of the color-changing portion 310 in the length direction, ensuring that the entire color-changing portion 310 is black, achieving high contrast display. When the display panel is stretched, the portion of the second electrode 40 accommodated in the gaps 510 is stretched and deformed, separating from both ends of the color-changing portion 310 in the length direction, making the separated color-changing portion 310 transparent, thereby increasing the effective light-emitting aperture ratio of the pixel unit 110, compensating for the decrease in light-emitting area caused by stretching, and improving the screen brightness in the stretched state. At the same time, this brightness compensation mechanism can effectively cover up the local dark spots or black spots caused by the increased resistance of the cathode 1103, improving the display uniformity in the stretched state. In addition, the gap 510 structure provides an independent deformation area for the second electrode 40, so that the tensile stress is concentrated in the gap 510, avoiding the stress effect of the overall deformation of the second electrode 40 on the display area, protecting the structural integrity of the display area, and improving the tensile durability of the display panel. At the same time, the planarization layer 50 itself is an existing structure in the manufacturing of display panels. The structure of the present invention can be realized by reserving the gap 510 area when the planarization layer 50 is patterned, without the need for additional photomasks or complex processes, and is compatible with existing manufacturing processes.

[0034] It should be noted that the planarization layer 50 can be formed of an organic photosensitive resin material, with a thickness ranging from 10μm to 15μm. The planarization layer 50 can be patterned by photolithography, and the voids 510 penetrate the planarization layer 50. The shape of the voids 510 can be rectangular, trapezoidal, or arc-shaped, with a width ranging from 2μm to 6μm.

[0035] It should also be noted that the gaps 510 are located at both ends of the color-changing portion 310, that is, on a plane perpendicular to the height direction, the projections of the gaps 510 are located at both ends of the color-changing portion 310 along the length direction. Specifically, each color-changing portion 310 corresponds to two gaps 510, which are respectively disposed at both ends of the color-changing portion 310, and the gaps 510 overlap with the ends of the color-changing portion 310 in the length direction. This positional relationship ensures that the portion of the second electrode 40 accommodated within the gap 510 can contact or separate from the end region of the color-changing portion 310.

[0036] It should also be noted that the second electrode 40 is formed of a conductive material, and the portion of the second electrode 40 contained in the gap 510 is in a relaxed stacked state, that is, the second electrode 40 forms a wavy, pleated or other structure in the gap 510, and its total length is greater than the straight distance of the gap 510, thereby providing deformation allowance during stretching; the degree of stacking of the second electrode 40 in the gap 510 can be adjusted by the depth and width of the gap 510; When the display panel is not stretched, the second electrode 40 is in a relaxed state, and the portion contained in the gap 510 remains in a stacked shape. Its surface is in physical contact with the two ends of the color-changing part 310 in the length direction. At this time, a voltage is applied between the first electrode 20 and the second electrode 40, forming a complete electric field at both ends of the color-changing part 310, driving the electrochromic material to undergo an oxidation-reduction reaction, so that the entire color-changing part 310 is black and opaque. When the display panel is stretched, the second electrode 40 is elongated as a whole, and the relaxed stacked portion contained in the gap 510 is gradually straightened, reducing its contact area with the end of the color-changing part 310, and eventually separating completely. After separation, the two ends of the color-changing part 310 lose the electric field effect, and the electrochromic material returns to the transparent state.

[0037] It should also be noted that the degree of separation between the second electrode 40 and the end of the color-changing portion 310 is related to the stretching amount of the display panel. When the stretching amount is small, the portion of the second electrode 40 housed in the gap 510 is only partially straightened, the contact area with the end of the color-changing portion 310 decreases but still remains in contact, and the color of the end of the color-changing portion 310 becomes lighter but not completely transparent; when the stretching amount reaches the threshold, the second electrode 40 completely separates from the end of the color-changing portion 310, and the end of the color-changing portion 310 becomes completely transparent; when the stretching force is released, the second electrode 40 returns to a relaxed state, the portion housed in the gap 510 is re-stacked, and re-contacts the end of the color-changing portion 310, causing the color-changing portion 310 to return to black. This reversible process ensures that the display panel maintains stable display performance during multiple stretch-release cycles.

[0038] In some embodiments, the planarization layer 50 includes alternating first planar portions 520 and second planar portions 530, with the first planar portion 520 located between two adjacent second planar portions 530; wherein, a gap 510 is provided between the first planar portion 520 and the second planar portion 530, the gap 510 is located at the junction of the color resist portion 320 and the color-changing portion 310, and on a plane perpendicular to the height direction, the projection of the gap 510 simultaneously covers the end of the color resist portion 320 and the end of the color-changing portion 310.

[0039] By dividing the planarization layer 50 into alternating first planar portions 520 and second planar portions 530, and forming a gap 510 between them, the present invention provides a defined deformation area for the second electrode 40. The gap 510 is located at the junction of the color resist portion 320 and the color-changing portion 310, and its projection covers the ends of both portions. This ensures that the portion of the second electrode 40 (transition electrode portion 430) housed in the gap 510 is located precisely between the color resist portion 320 and the color-changing portion 310. When not stretched, it remains in contact with the end of the color-changing portion 310. When stretched, it can deform in a predetermined direction and separate from the end of the color-changing portion 310. This avoids uncontrollable twisting or displacement of the second electrode 40 during stretching, and improves the stability and repeatability of the brightness compensation function. The projection of the gap 510 simultaneously covers the ends of both the color resist section 320 and the color-changing section 310, providing a symmetrical deformation space for the transition electrode section 430. When the display panel is stretched, the transition electrode section 430 can expand evenly to both sides, avoiding stress concentration or incomplete separation caused by asymmetrical deformation space. At the same time, the symmetrical gap 510 structure enables the display panel to maintain good compensation performance during bidirectional stretching, improving the tensile durability of the display panel. The alternating arrangement of the first flat portion 520 and the second flat portion 530 matches the alternating structure of the color resist portion 320 and the color-changing portion 310. The gap 510 is set at the junction of the two, naturally forming a periodic structure consistent with the pixel arrangement direction. This makes it easier to precisely control the position and size of the gap 510 through photolithography, which is beneficial to improving manufacturing yield and dimensional consistency. In addition, the projection of the gap 510 also covers the end of the color resist portion 320, so that the part of the second electrode 40 contained in the gap 510 cooperates with the color-changing portion 310. When not stretched, the color-changing portion 310 is black, which can effectively absorb the light leaking from the edge of the color resist portion 320, prevent color crosstalk between adjacent pixels, and improve the contrast and color purity of the displayed image.

[0040] It should be noted that the width of the gap 510 is 2 to 6 micrometers. Specifically, the gap 510 is formed by the boundary of the planarization layer 50 receding inward on both the color resist portion 320 side and the color-changing portion 310 side. Specifically, the boundary of the planarization layer 50 recedes inward by 1 to 2 micrometers on the color resist portion 320 side and by 1 to 3 micrometers on the color-changing portion 310 side, thereby forming a gap 510 with a width of 2 to 6 micrometers between the end of the color resist portion 320 and the end of the color-changing portion 310.

[0041] In some embodiments, the second electrode 40 includes a main electrode portion 410, an auxiliary electrode portion 420, and a transition electrode portion 430; the main electrode portion 410 covers the side of the color-changing portion 310 away from the display substrate 10, and the first flat portion 520 covers the side of the main electrode portion 410 away from the display substrate 10; the auxiliary electrode portion 420 covers the side of the second flat portion 530 away from the substrate; the two ends of the transition electrode portion 430 are respectively connected to the main electrode portion 410 and the auxiliary electrode portion 420, and the transition electrode portion 430 is located in the gap 510.

[0042] By dividing the second electrode 40 into a main electrode portion 410, an auxiliary electrode portion 420, and a transition electrode portion 430, the present invention achieves functional separation of each part of the second electrode 40. Specifically, the main electrode portion 410 covers the side of the color-changing portion 310 away from the display substrate 10 and is covered by the first flat portion 520. It maintains stable contact with the color-changing portion 310, ensuring that the entire color-changing portion 310 can obtain a complete electric field and present a uniform black color when not stretched. The auxiliary electrode portion 420 covers the side of the second flat portion 530 away from the display substrate 10. The first flat portion 520 and the second flat portion 530 fix the positions of the main electrode portion 410 and the auxiliary electrode portion 420 through their structure, so that they remain stable when the display panel is stretched and do not deform. The transition electrode portion 430 is located in the gap 510, and its two ends are connected to the main electrode portion 410 and the auxiliary electrode portion 420, respectively. It is the part of the second electrode 40 that is allowed to deform. This "fixed at both ends and deformable in the middle" structural design allows tensile stress to be precisely concentrated in the transition electrode part 430, while the main electrode part 410, the auxiliary electrode part 420, and the color-changing part 310 area in contact with them remain stable, thereby avoiding the transmission of tensile stress to the display area, protecting the integrity of the stacked structure in the area above the pixel unit 110, and improving the tensile durability of the display panel. The transition electrode portion 430 is located within the gap 510 and its two ends are respectively connected to the fixed main electrode portion 410 and auxiliary electrode portion 420, forming the passage path of the second electrode 40 in the planarization layer 50. When the display panel is not stretched, the transition electrode portion 430 is in a relaxed stacked state, and its surface remains in contact with both ends of the color-changing portion 310 in the length direction, ensuring that the color-changing portion 310 is entirely black; when the display panel is stretched, the transition electrode portion 430 is straightened, and its contact area with the ends of the color-changing portion 310 decreases or even completely separates, causing the color-changing portion 310 at the separation point to become transparent. This structural design allows the brightness compensation function to occur precisely in the gap 510 area where the transition electrode portion 430 is located, while the central area of ​​the color-changing portion 310 covered by the main electrode portion 410 always maintains stable contact and electric field, thereby achieving precise control of the increase in aperture ratio and avoiding unnecessary brightness loss or color shift.

[0043] It should be noted that the main electrode part 410, the auxiliary electrode part 420 and the transition electrode part 430 are integrally formed from the same conductive material, without the need for additional connection structures or assembly steps.

[0044] In some embodiments, the transition electrode portion 430 has an inclined angle with the height direction; when the display panel is stretched, the transition electrode portion 430 is stretched, the inclined angle increases, and it separates from the color-changing portion 310 at both ends in the length direction.

[0045] By setting an inclined angle between the transition electrode portion 430 and the height direction, the transition electrode portion 430 is accommodated in an inclined posture within the gap 510 when the display panel is not stretched. This creates a pre-stretched state within the gap 510, with its actual path length exceeding the straight-line distance between the main electrode portion 410 and the auxiliary electrode portion 420, providing sufficient deformation allowance during stretching. When the display panel is stretched, the transition electrode portion 430 is subjected to stretching, and the inclined angle gradually increases. The transition electrode portion 430 deforms towards a straighter direction. This process causes the contact area between the transition electrode portion 430 and the end of the color-changing portion 310 to smoothly decrease with increasing stretching, ultimately achieving complete separation. Compared to transition electrode portions 430 arranged horizontally, the inclined design makes the separation process more sensitive and controllable, enabling reliable separation with a smaller stretching amount and improving the response speed of brightness compensation. Furthermore, the tilted angle design allows for a more compact stacking of the transition electrode portion 430 within the gap 510. In its unstretched state, the transition electrode portion 430 is accommodated in a tilted posture within a limited space, eliminating the need for additional horizontal space and thus improving pixel density. Simultaneously, the size of the tilted angle can be controlled by the height difference between the first flat portion 520 and the second flat portion 530 in the planarization layer 50 and the length of the gap 510, offering good design flexibility and allowing for adjustment of the sensitivity and range of brightness compensation for different application scenarios.

[0046] It should be noted that, in order to accommodate the inclined arrangement of the transition electrode portion 430, the extension direction of the gap 510 is also provided with an inclined angle that is basically consistent with that of the display substrate 10. In other words, the gap 510 does not necessarily have to extend parallel to the height direction, but can be adapted to the required inclined angle of the transition electrode portion 430, so that the transition electrode portion 430 can be accommodated in a natural and relaxed inclined posture within the gap 510, avoiding additional bending stress or poor contact due to mismatch in direction.

[0047] It should also be noted that, such as Figure 2 , Figure 3As shown, when the display panel is not stretched, the tilt angle between the transition electrode portion 430 and the height direction is α; when the display panel is stretched, the tilt angle between the transition electrode portion 430 and the height direction is β, where α < β.

[0048] In some embodiments, the pixel unit 110 includes an anode 1101, an organic light-emitting functional layer 1102, and a cathode 1103 arranged in sequence, with the cathode 1103 connected in parallel with the second electrode 40; wherein the resistance of the second electrode 40 decreases when it is stretched.

[0049] In existing stretchable display panels, the cathode 1103 experiences a significant increase in resistance due to stretching and thinning during operation. This leads to a rise in voltage drop across the current loop, resulting in uneven current density distribution across pixel units 110 and a decrease in overall current density. Consequently, this causes a reduction in luminous intensity in localized areas, leading to display anomalies such as dark spots or even black spots. This invention directly compensates for the increased resistance of the cathode 1103 by connecting the second electrode 40 in parallel with the cathode 1103 and reducing the resistance of the second electrode 40 during stretching. When the display panel is stretched, the resistance of the cathode 1103 increases, while the resistance of the second electrode 40 decreases. The equivalent resistance after their parallel connection depends on the electrode with the lower resistance. Therefore, the change in the equivalent resistance of the overall circuit is significantly offset, effectively suppressing the problems of increased voltage drop and decreased current density. This fundamentally avoids the generation of localized dark spots or black spots, ensuring the uniformity and stability of display brightness under stretched conditions. Specifically, the parallel connection between the second electrode 40 and the cathode 1103 allows the second electrode 40 to not only serve as the upper electrode controlling the color change of the color-changing section 310, but also as an auxiliary conductive path for the cathode 1103, achieving functional reuse. This eliminates the need for an additional independent electrode layer or complex wiring for the auxiliary cathode 1103, simplifying the display panel's stacked structure and reducing manufacturing difficulty and cost. Furthermore, since the second electrode 40 is located above the color resist structure 30 and close to the light-emitting side, its parallel path with the cathode 1103 is shorter, enabling more effective sharing of the current load on the cathode 1103 under tension, thus improving the efficiency of current compensation. The characteristic of the second electrode 40 reducing resistance during stretching, combined with the brightness compensation mechanism that separates the second electrode 40 from the color-changing part 310 during stretching and makes the color-changing part 310 transparent, creates a synergistic effect. On one hand, the brightness compensation mechanism increases the overall brightness of the screen by increasing the aperture ratio; on the other hand, the resistance reduction mechanism ensures uniform light emission by improving current distribution. Together, these two mechanisms ensure that the display panel maintains sufficient brightness while avoiding the appearance of local dark spots or black spots during stretching, achieving comprehensive compensation for the negative impact of stretching from both the dimensions of "brightness" and "uniformity".

[0050] It should be noted that the second electrode 40 is connected in parallel with the cathode 1103, meaning that the second electrode 40 and the cathode 1103 form a parallel relationship in the circuit, and together they constitute the current path of the cathode 1103 circuit. Specifically, the second electrode 40 can be electrically connected to the cathode 1103 of the pixel unit 110 through edge punching or via connection.

[0051] In some embodiments, the second electrode 40 is formed of a conductive folded metamaterial; wherein the conductive folded metamaterial has increased resistance when compressed and decreased resistance when stretched.

[0052] It is important to note that conductive folded metamaterials (CFMs) are a new type of metamaterial that possesses high conductivity and excellent mechanical folding durability through artificial structural design. Their core characteristics stem from their intricately designed microstructure, rather than the material's inherent chemical composition. Traditional intrinsically conductive materials (such as metals, conductive polymers, and carbon nanotubes) rely on chemical bonds to transfer stress, making them unable to withstand repeated 180° "true folds" (i.e., the two sides are completely flush at the fold), and stress accumulation can easily lead to fracture or performance degradation. In contrast, CFMs, through specific microstructural designs, can maintain excellent conductivity while withstanding numerous or even unlimited damage-free folds. CFMs can be prepared using various processes. For example... Figure 4 , Figure 5 As shown, in some embodiments, a low-power laser is coupled with a biomimetic Taylor cone process in a high-voltage electrostatic field using a "laser-electrostatic field coupled biomimetic spinning" technique. This allows for precise control of the flight assembly parameters of the carbon nanotube precursor solution, resulting in polymer composite fibers. After carbonization, conductive folded metamaterials are obtained; the conductivity of this material can reach 10³ S·m. - ¹ magnitude, and can withstand 10 7 The material undergoes multiple, even infinite, lossless folding processes. During the folding process, an "ε"-like structure is formed inside the material, consisting of a wave-like protrusion layer, localized fiber slip grooves, and stress dispersion arcs. This structure effectively disperses the stress generated by the 180° folding in multiple dimensions, including lines, surfaces, and volumes, preventing chemical bonds from directly bearing extreme stress and thus protecting the integrity of the conductive nanofibers. CFMs possess unique electrical properties. Under tensile strains of 0–50% or even higher, their electrical resistance decreases significantly with increasing tension, and recovers reversibly upon release. The microscopic mechanism behind this property lies in the controllable topological reconstruction of the conductive network within the CFMs, rather than a simple "stretching." Specifically, the conductive network of CFMs exhibits a three-dimensional porous, wrinkled, or interlocked structure, undergoing the following changes upon stretching: (1) The contact resistance drops significantly. In the initial state, the conductive nanounits that make up CFMs (such as carbon nanotubes, MXene, graphene, etc.) are in point contact or weak contact, and the contact resistance is relatively large. After stretching, the units are straightened and compressed, and they are transformed into surface contact or strong contact. The contact area increases exponentially, thereby causing the contact resistance to drop sharply. (2) The conductive path is "straightened" and the bulk resistance decreases. In the initial state, the conductive network is bent and entangled, the carrier transport path is long and there is a lot of scattering; after stretching, the path is straightened, the carrier path becomes shorter and the bulk resistance decreases; (3) The porous structure is densified, and the conductive network is more continuous. In the initial state, there are a lot of air gaps in the porous structure, and the conductive path is discontinuous; after stretching, the pores are compressed and closed, the conductive network is more dense, and the overall conductivity is improved; CFMs offer diverse material systems, allowing selection based on specific application requirements. Mainstream materials include MXene (two-dimensional transition metal carbides, nitrides, or carbonitrides)-based CFMs, carbon nanotube or graphene-based CFMs, and composite structures of metal nanowires or nanomesh with CFMs. The specific structures, properties, and preparation methods of CFMs are existing technologies and will not be elaborated upon in this application.

[0053] Therefore, the "stretch resistance reduction and compression resistance increase" characteristics enable CFMs to adaptively adjust resistance according to the type of stress they are subjected to, forming a synergistic effect with the brightness compensation mechanism where the second electrode 40 separates from the color-changing part 310 during stretching, and the color-changing part 310 becomes transparent. On the one hand, the brightness compensation mechanism increases the overall brightness of the screen by increasing the aperture ratio; on the other hand, the stretch resistance reduction mechanism of CFMs ensures uniform light emission by improving current distribution. The combined effect of these two mechanisms ensures that the display panel maintains sufficient brightness while avoiding the appearance of local dark spots or black spots under stretching conditions, achieving comprehensive compensation for the negative impact of stretching from both the dimensions of "brightness" and "uniformity". CFMs have good mechanical durability and can withstand more than 10 7 The fact that the resistance compensation function of this invention remains stable and reliable throughout the entire lifespan of the display panel without performance degradation after one stretch-release cycle ensures that the resistance compensation function of this invention remains stable and reliable throughout the entire lifespan of the display panel.

[0054] It should also be noted that the film formation method of conductive folded metamaterials can be selected according to specific process requirements, including but not limited to biomimetic electrospinning, solution method, vacuum filtration and transfer, laser direct writing or laser induction and other methods.

[0055] In some embodiments, the display substrate 10 further includes a substrate 120, a pixel definition layer 130, and an encapsulation layer 140; the pixel definition layer 130 protrudes from one side of the substrate 120 and forms a plurality of spaced pixel receiving areas, and pixel units 110 are disposed in the pixel receiving areas; the encapsulation layer 140 covers the side of the pixel units 110 away from the substrate 120 and the side of the pixel definition layer 130 away from the substrate 120.

[0056] The pixel definition layer 130 defines the position and size of each pixel unit 110, ensuring spatial isolation between adjacent pixel units 110 and avoiding crosstalk between them. An encapsulation layer 140 covers both the side of the pixel unit 110 facing away from the substrate 120 and the side of the pixel definition layer 130 facing away from the substrate 120, forming a continuous thin-film encapsulation structure. This effectively blocks moisture and oxygen, protecting the organic light-emitting material and cathode 1103 in the pixel unit 110 from environmental corrosion. Simultaneously, the cooperation between the pixel definition layer 130 and the encapsulation layer 140 provides a planarized substrate for the subsequent color resist structure 30 and second electrode 40, providing a good foundation for the fabrication of the first electrode 20, color resist structure 30, and second electrode 40. Compared to directly fabricating subsequent structures on the pixel definition layer 130, the transition through the encapsulation layer 140 reduces surface defects, improves film adhesion, and enhances display uniformity. Furthermore, both the pixel definition layer 130 and the encapsulation layer 140 are existing structures in display panel manufacturing, requiring no additional process steps and are compatible with existing manufacturing processes.

[0057] It should be noted that the encapsulation layer 140 includes an organic encapsulation layer 1401 and an inorganic encapsulation layer 1402. The organic encapsulation layer 1401 covers the side of the pixel unit 110 facing away from the substrate 120 and the side of the pixel definition layer 130 facing away from the substrate 120; the inorganic encapsulation layer 1402 covers the side of the organic encapsulation layer 1401 facing away from the substrate 120. The organic encapsulation layer 1401 is used to provide flexibility and stress buffering, and the material of the organic encapsulation layer 1401 can be selected from acrylate, epoxy resin, polyimide, etc.; the inorganic encapsulation layer 1402 is used to provide water and oxygen barrier, and the material of the inorganic encapsulation layer 1402 can be selected from silicon nitride (SiNx), silicon oxide (SiOx), aluminum oxide (AlOx), etc.

[0058] It should also be noted that the pixel definition layer 130 includes multiple spaced-apart opening areas and non-opening areas located between two adjacent opening areas, with the opening areas forming pixel accommodating regions; specifically, the opening area refers to the area on the pixel definition layer 130 where windows are opened, i.e., the area where the pixel actually emits light, such as... Figure 1As shown, the cross-sectional shape of the opening area is a trapezoidal shape with a larger top and a smaller bottom, that is, the bottom opening size of the pixel definition layer 130 facing the substrate is smaller than the top opening size on the side away from the substrate; the non-opening area refers to the solid part of the pixel definition layer 130 surrounding the opening area, which is used to isolate adjacent pixel units 110.

[0059] In some embodiments, the display panel further includes a flexible substrate 60 and an upper substrate 70; the flexible substrate 60 is disposed on the side of the encapsulation layer 140 away from the substrate 120, and the first electrode 20 is disposed on the side of the flexible substrate 60 away from the display substrate 10; the upper substrate 70 covers the side of the first flat portion 520 away from the display substrate 10 and the side of the auxiliary electrode portion 420 away from the display substrate 10, and spans across the gap 510.

[0060] The flexible substrate 60 provides overall flexible support for the display panel, enabling it to adapt to deformation requirements such as stretching. By placing the first electrode 20 on the side of the flexible substrate 60 away from the display substrate 10, the first electrode 20 is directly supported on the flexible substrate 60. It can deform in tandem with the flexible substrate 60 when the display panel is stretched, maintaining the structural integrity and electrical continuity of the first electrode 20. This avoids electrode breakage or abnormal increase in resistance due to deformation, thereby ensuring a stable voltage supply between the first electrode 20 and the second electrode 40, and ensuring the reliability of color control in the color-changing section 310. The upper substrate 70 spans across the gap 510, forming a closed cavity below the upper substrate 70 in the gap 510 region. This cavity provides free deformation space for the transition electrode portion 430, while preventing external impurities from entering the gap 510 and affecting the deformation performance of the transition electrode portion 430. When the display panel is stretched, the transition electrode portion 430 deforms freely within this cavity, separating from the end of the color-changing portion 310; after the stretching force is released, the transition electrode portion 430 returns to its initial state and re-contacts the end of the color-changing portion 310. The presence of the cavity ensures that the transition electrode portion 430 maintains a clean and stable deformation environment during multiple stretch-release cycles, improving the reliability and durability of the brightness compensation function.

[0061] It should be noted that the flexible substrate 60 can be formed using flexible materials such as polyimide (PI).

[0062] It should also be noted that the surface of the upper substrate 70 can be further provided with functional layers such as an anti-reflective layer to improve the optical performance of the display panel and the user experience.

[0063] This application also provides a display device, including the display panel provided in the foregoing embodiments of this application.

[0064] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0065] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0066] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A display panel, characterized in that, include: The display substrate includes multiple pixel units arranged at intervals; The first electrode is disposed on one side of the display substrate; A color resist structure is provided on the side of the first electrode facing away from the display substrate. The color resist structure includes alternating color-changing portions and color resist portions. The color-changing portions are located between two adjacent color resist portions. Each color resist portion corresponds to a pixel unit. On a plane perpendicular to the height direction, the projection of the color resist portion covers the projection of the corresponding pixel unit. The second electrode is disposed on the side of the color-changing portion away from the display substrate; the first electrode and the second electrode are used to apply voltage to the color-changing portion; When the display panel is not stretched, the second electrode remains in contact with the entire color-changing part, making the entire color-changing part black; when the display panel is stretched, the second electrode stretches and separates from both ends of the color-changing part in the length direction, making the color-changing part at the separation point transparent.

2. The display panel according to claim 1, characterized in that, The display panel further includes a planarization layer, which is located on the side of the color resist structure opposite to the display substrate. The planarization layer has a plurality of spaced gaps located at both ends of the color-changing portion in the length direction. Wherein, a portion of the second electrode is housed within the gap. When the display panel is not stretched, the second electrode housed within the gap remains in contact with both ends of the color-changing portion in the length direction. When the display panel is stretched, the second electrode housed within the gap stretches and separates from both ends of the color-changing portion in the length direction, making the color-changing portion at the separation point transparent.

3. The display panel according to claim 2, characterized in that, The flattening layer includes alternating first flat portions and second flat portions, with the first flat portion located between two adjacent second flat portions; wherein, there is a gap between the first flat portion and the second flat portion, the gap being located at the junction of the color resist portion and the color-changing portion, and on a plane perpendicular to the height direction, the projection of the gap simultaneously covers the end of the color resist portion and the end of the color-changing portion.

4. The display panel according to claim 3, characterized in that, The second electrode includes: The main electrode portion covers the side of the color-changing portion away from the display substrate, and the first flat portion covers the side of the main electrode portion away from the display substrate; An auxiliary electrode portion covers the side of the second flat portion that faces away from the substrate; The transition electrode section is connected to the main electrode section and the auxiliary electrode section at both ends, and the transition electrode section is located within the gap.

5. The display panel according to claim 4, characterized in that, The transition electrode portion has an inclined angle with the height direction; When the display panel is stretched, the transition electrode portion stretches, the tilt angle increases, and it separates from the color-changing portion at both ends in the length direction.

6. The display panel according to any one of claims 1-5, characterized in that, The pixel unit includes an anode, an organic light-emitting functional layer, and a cathode arranged in sequence, with the cathode connected in parallel with the second electrode; wherein the resistance of the second electrode decreases when it is stretched.

7. The display panel according to claim 6, characterized in that, The second electrode is formed of a conductive folded metamaterial; wherein the conductive folded metamaterial has an increased resistance when compressed and a decreased resistance when stretched.

8. The display panel according to claim 4, characterized in that, The display substrate further includes: Substrate; A pixel definition layer protrudes from one side of the substrate and forms a plurality of spaced pixel accommodating regions, wherein the pixel unit is disposed within the pixel accommodating region; An encapsulation layer covers the side of the pixel unit facing away from the substrate, and the side of the pixel definition layer facing away from the substrate.

9. The display panel according to claim 8, characterized in that, The display panel also includes: A flexible substrate is disposed on the side of the encapsulation layer opposite to the substrate, and the first electrode is disposed on the side of the flexible substrate opposite to the display substrate; An upper substrate covers the side of the first flat portion opposite to the display substrate and the side of the auxiliary electrode portion opposite to the display substrate, and is disposed across the gap.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1-9.

Images