Display panel, display device and driving method of display panel

Abstract

The present disclosure provides a display panel, a display device and a driving method of the display panel, and belongs to the technical field of display, which can solve the problem of limited application range of the existing display panel. The display panel comprises a driving substrate and an electronic paper film. The driving substrate comprises a substrate, a first common electrode, a second common electrode and a pixel electrode. The first common electrode and the second common electrode are located on the substrate. The pixel electrode is located on the side of the film layer where the first common electrode and the second common electrode are located away from the substrate. The pixel electrode comprises a conductive coil. The electronic paper film comprises magnetic charged particles. The vertical distance between the end of the conductive coil and the first common electrode is less than the vertical distance between the part of the conductive coil except the end and the second common electrode.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, and specifically relates to a display panel, a display device, and a driving method for the display panel. Background Technology

[0002] Among related technologies, the main approaches to realizing Electronic Shelf Label (ESL) technology include cholesteric liquid crystal display technology, electrophoretic display technology (EPD), and electrowetting display technology, among which electrophoretic display technology is the most widely used.

[0003] Electrophoresis is typically achieved using loading structures, such as microcapsules or microcup structures. Both microcapsules and microcup structures rely on the movement of charged particles to create the image. For example, in a microcapsule structure, when a negative electric field is applied to both ends, positively charged white particles move to the negative electrode under the influence of the field, while negatively charged black particles move to the bottom of the microcapsule and "hide," making the surface appear white. When a positive electric field is applied to the sides of an adjacent microcapsule, the black particles move to the top of the microcapsule under the influence of the field, making the surface appear black.

[0004] However, the current electronic shelf labels have a relatively simple display effect and cannot achieve transparent display, which limits the application scope of electronic shelf labels. Summary of the Invention

[0005] This disclosure aims to solve at least one of the technical problems existing in the prior art, and provides a display panel, a display device, and a driving method for the display panel.

[0006] In a first aspect, embodiments of this disclosure provide a display panel, wherein the display panel includes: a driving substrate and an electronic paper film;

[0007] The driving substrate includes: a substrate, a first common electrode, a second common electrode, and a pixel electrode; the first common electrode and the second common electrode are located on the substrate; the pixel electrode is located on the side of the film layer containing the first common electrode and the second common electrode away from the substrate; the pixel electrode includes: a conductive coil; the electronic paper film includes: magnetically charged microparticles;

[0008] The vertical distance between the end of the conductive coil and the first common electrode is less than the vertical distance between the portion of the conductive coil other than the end and the second common electrode.

[0009] In some examples, an organic insulating layer is provided between the film layer containing the first common electrode and the second common electrode and the conductive coil;

[0010] The organic insulating layer between the first common electrode and the end of the conductive coil is hollowed out, while the organic insulating layer between the second common electrode and the conductive coil is continuous.

[0011] In some examples, the conductive coil includes at least one of a spiral coil and a loop coil.

[0012] In some examples, the orthographic projection of the end of the conductive coil onto the substrate at least partially overlaps with the orthographic projection of the first common electrode onto the substrate.

[0013] In some examples, the first common electrode and the second common electrode are formed in the same film layer.

[0014] In some examples, the driving substrate further includes: thin-film transistors, gate lines, and data lines located on the substrate;

[0015] The gate of the thin-film transistor is electrically connected to the gate line, the source is electrically connected to the beginning of the conductive coil, and the drain is electrically connected to the data line.

[0016] In some examples, the first common electrode, the gate of the thin-film transistor, and the gate line are disposed on the same layer.

[0017] In some examples, the projected area of ​​the second common electrode on the substrate is larger than the projected area of ​​the first common electrode on the substrate.

[0018] In some examples, both the first common electrode and the second common electrode are made of transparent metal oxide.

[0019] In some examples, the electronic paper film further includes: an electrophoretic solution;

[0020] The magnetically charged microparticles are doped into the electrophoretic solution.

[0021] In some examples, the electronic paper film further includes: a loading structure;

[0022] The magnetically charged microparticles and the electrophoretic solution are filled in the loading structure.

[0023] In some examples, the loading structure has a first opening near the base and a second opening away from the base;

[0024] The area of ​​the first opening is smaller than the area of ​​the second opening.

[0025] In some examples, the loading structure includes a microcup structure or a microcapsule structure.

[0026] In some examples, the electronic paper film further includes: a first electrode plate and a second electrode plate disposed opposite to each other;

[0027] The loading structure is located between the first electrode plate and the second electrode plate.

[0028] In some examples, both the first electrode and the second electrode are made of transparent metal oxide.

[0029] In some examples, the magnetically charged particles include: black magnetically charged particles or red magnetically charged particles.

[0030] In some examples, the material of the magnetically charged particles includes nickel or iron oxide.

[0031] In some examples, the display panel further includes: a supporting substrate;

[0032] The support substrate is located on the side of the electronic paper film opposite to the driving substrate.

[0033] In some examples, the material of the support substrate includes: a non-magnetic transparent metal oxide.

[0034] Secondly, embodiments of this disclosure provide a display device, wherein the display device includes a display panel as described above.

[0035] Thirdly, embodiments of this disclosure provide a driving method for a display panel, used to drive the display panel as described above, wherein the driving method for the display panel includes:

[0036] A voltage is applied to the first common electrode, so that a current loop is formed between the first common electrode and the conductive coil to generate a magnetic field perpendicular to the substrate and drive the magnetically charged particles to move toward or away from the substrate.

[0037] A voltage is applied to the second common electrode, causing a horizontal edge electric field parallel to the substrate to be formed between the second common electrode and the conductive coil, and driving the magnetically charged particles to move toward the periphery or edge of the pixel area. Attached Figure Description

[0038] Figure 1 This is a cross-sectional structural diagram of a display panel provided in an embodiment of the present disclosure.

[0039] Figure 2 This is a schematic diagram of the planar structure of a display panel provided in an embodiment of the present disclosure.

[0040] Figure 3 for Figure 1 The diagram shows the structure of the driving substrate in the display panel.

[0041] Figure 4 This is a flowchart illustrating a method for driving a display panel according to an embodiment of the present disclosure. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0044] Electronic Shelf Labels (ESLs) primarily utilize electrophoresis technology. During the display process, an electric field drives two types of electrically charged colored microparticles within the electrophoretic solution to move back and forth between the display and non-display sides of the panel. This allows multiple pixels on the display panel to show the color of the colored microparticles located on the display side. For example, if the charged microparticles are black and white, the electric field can drive either the black or white charged microparticles to the display side, achieving either a black or white display.

[0045] However, the current electronic shelf labels have a relatively simple display effect and cannot achieve transparent display, which limits the application scope of electronic shelf labels.

[0046] To at least solve one of the aforementioned technical problems, this disclosure provides a display panel, a display device, and a driving method for the display panel. The display panel, display device, and driving method for the display panel provided in this disclosure will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0047] Figure 1 This is a cross-sectional structural diagram of a display panel provided in an embodiment of the present disclosure. Figure 2 This is a schematic diagram of a planar structure of a display panel provided in an embodiment of the present disclosure. Figure 3 for Figure 1 The schematic diagram of the driving substrate in the display panel shown is as follows: Figures 1 to 3 As shown, the display panel includes a driving substrate 10 and an electronic paper film 20; the driving substrate 10 includes a substrate 100, a first common electrode 101, a second common electrode 102, and a pixel electrode 103; the first common electrode 101 and the second common electrode 102 are located on the substrate 100; the pixel electrode 103 is located on the side of the film layer where the first common electrode 101 and the second common electrode 102 are located away from the substrate 100; the pixel electrode 103 includes a conductive coil 1030; the electronic paper film 20 includes magnetically charged microparticles 201; the vertical distance between the end of the conductive coil 1030 and the first common electrode 101 is less than the vertical distance between the portion of the conductive coil 1030 other than the end and the second common electrode 102.

[0048] The substrate 100 can be made of rigid materials such as glass, which can improve its load-bearing capacity for other film layers on it. Alternatively, the substrate 100 can be made of flexible materials such as polyimide (PI), which can improve the overall bending and tensile resistance of the display panel, preventing stress generated during bending, stretching, and torsion that could cause the substrate 100 to break and result in poor circuitry. In practical applications, the material of the substrate 100 can be selected appropriately according to actual needs to ensure that the display panel has good performance.

[0049] The first common electrode 101, the second common electrode 102, and the pixel electrode 103 can be transparent conductive films such as indium tin oxide (ITO) formed on the substrate 100 using processes such as sputtering and evaporation. In this way, the light reflected by the magnetically charged particles 201 can pass through the first common electrode 101, the second common electrode 102, the pixel electrode 103, and the substrate 100 and be perceived by the human eye, thus achieving the display function. It should be noted that the color of the light reflected by the magnetically charged particles 201 is related to their own color. For example, black charged particles absorb light, resulting in a black display image, while red magnetically charged particles reflect red light, resulting in a red display image. In the embodiments disclosed herein and the following description, black charged particles will be used as an example for explanation. It is understood that the implementation principle and effect of charged particles 201 of other colors are similar and will not be described in detail.

[0050] A positive voltage signal is input to the pixel electrode 103, and a low voltage signal, the same as that applied to the common electrode in a conventional display panel, is input to the first common electrode 101. No voltage signal is applied to the second common electrode 102. At this time, because the vertical distance between the end of the conductive coil 1030 formed by the pixel electrode 103 and the first common electrode 101 is small, a large capacitance can be formed between the conductive coil 1030 and the first common electrode 101. This capacitance is much larger than that at other locations. Therefore, the voltage drop of the conductive coil 1030 is mainly reduced through the first common electrode 101, creating a voltage difference between them. This capacitance then forms a current loop in the conductive coil 1030. The current in the loop flows from the beginning to the end of the conductive coil 1030, i.e., counterclockwise. According to Ampere's law, the magnetic field generated by the current loop is perpendicular to the substrate 100 and points upwards. Therefore, the magnetically charged particles 201 move towards the substrate 100 (i.e., upwards), achieving a black display.

[0051] A negative voltage signal is input to the pixel electrode 103, and a low voltage signal, the same as that applied to the common electrode in a conventional display panel, is input to the first common electrode 101. No voltage signal is applied to the second common electrode 102. At this time, the conductive coil 1030 formed by the pixel electrode 103 can form a large capacitance with the first common electrode 101. The capacitance value here is much larger than that at other locations. Therefore, the voltage drop of the conductive coil 1030 is mainly reduced through the first common electrode 101, thus creating a voltage difference between the conductive coil 1030 and the first common electrode 101. This capacitance between them forms a current loop in the conductive coil 1030. The current in the current loop flows from the end to the beginning of the conductive coil 1030, i.e., clockwise. According to Ampere's law, the magnetic field generated by the current loop is perpendicular to the substrate 100 and points downwards. Therefore, the magnetically charged particles 201 move in a direction away from the substrate 100 (i.e., downwards), which can hide the magnetically charged particles 201 and achieve a white display.

[0052] A positive voltage signal is input to the pixel electrode 103, no voltage signal is applied to the first common electrode 101, and the second common electrode 102 receives the same low voltage signal as the common electrode in a conventional display panel. Since there is no voltage signal on the first common electrode 101, the conductive coil 1030 cannot form a current loop, and the magnetically charged particles 201 are not driven by the magnetic field. At this time, there is a voltage difference between the conductive coil 1030 formed by the second common electrode 102 and the pixel electrode 103, creating a horizontal edge electric field. Under the influence of this horizontal edge electric field, the magnetically charged particles 201 are driven to the edge or periphery of the pixel area, allowing the display panel to display the image behind it, thus achieving a transparent display effect.

[0053] As can be seen, the display panel provided in this embodiment can not only achieve black and white displays, but also transparent displays. This allows it to be applied in technical fields requiring transparent displays, such as transparent shop windows, vehicle displays, and 3D displays, greatly expanding the application scope and scenarios of electronic shelf labels. Furthermore, the magnetic field generated by the driving substrate 10 can drive magnetically charged particles to move vertically, and the horizontal edge electric field can drive magnetically charged particles to move horizontally. These two fields do not interfere with each other, avoiding display abnormalities caused by mutual interference between electric and magnetic fields. Therefore, it can improve the display effect and enhance the user experience.

[0054] like Figure 3 As shown, an organic insulating layer 104 is provided between the film layer containing the first common electrode 101 and the second common electrode 102 and the conductive coil 1030; the organic insulating layer 104 between the first common electrode 101 and the end of the conductive coil 1030 is hollowed out, and the organic insulating layer 104 between the second common electrode 102 and the conductive coil 1030 is continuously provided.

[0055] In practical applications, the conductive coil 1030 can be arranged in a spiral shape, with its starting end located at the edge of the spiral coil and its ending end located at the center of the spiral coil. The organic insulating layer 104 can be made of organic materials such as resin. Under normal circumstances, the organic insulating layer 104 has a relatively large thickness, which can provide good insulation and prevent short circuits between either the first common electrode 101 or the second common electrode 102 and the conductive coil 1030 formed by the pixel electrode 103. It also has the function of dispersing the stress between film layers, preventing damage caused by excessive stress between adjacent film layers. In addition to the organic insulating layer 104, a passivation layer 105 and other film layers can also be provided. The passivation layer 105 can be made of inorganic materials such as silicon oxide, silicon nitride, and silicon oxynitride. At the position where the first common electrode 101 is directly opposite the conductive coil 1030, the organic insulating layer 104 can be hollowed out. This greatly reduces the vertical distance between the first common electrode 101 and the conductive coil 1030. When voltage signals of different polarities are input to the first common electrode 101 and the conductive coil 1030, a capacitor with a large capacitance value can be formed between them. This allows a current loop to be formed in the conductive coil 1030, generating an electric field to drive the magnetically charged particles 201 to move vertically, achieving a black or white display. At the position where the second common electrode 102 is directly opposite the conductive coil 1030, the organic insulating layer 104 can be continuously disposed. Due to the presence of the organic insulating layer 104, the vertical distance between them is larger. When voltage signals of different polarities are input between the second common electrode 102 and the conductive coil 1030, a horizontal edge electric field can be formed between them, driving the magnetic particles to move horizontally, achieving a transparent display.

[0056] It should be noted that, in addition to the spiral coil mentioned above, the conductive coil 1030 can also be a U-shaped coil, etc. Its shape can be circular, elliptical, square or triangular, etc. The implementation principle is the same as that described above, and will not be repeated here.

[0057] In some embodiments, such as Figure 3 As shown, the orthographic projection of the end of the conductive coil 1030 on the substrate 100 at least partially overlaps with the orthographic projection of the first common electrode 101 on the substrate 100.

[0058] The end of the conductive coil 1030 is positioned directly opposite the first common electrode 101 to ensure that when the conductive coil 1030 and the first common electrode 101 are input with voltage signals of different polarities, a capacitor with a large capacitance value can be formed between them. This allows a current loop to be formed in the conductive coil 1030, thereby generating a horizontal edge electric field to drive the magnetically charged particles 201 to move along the vertical direction, achieving a black or white display.

[0059] In some embodiments, such as Figure 3As shown, the first common electrode 101 and the second common electrode 102 are formed in the same film layer.

[0060] The first common electrode 101 and the second common electrode 102 do not receive voltage signals simultaneously and do not interfere with each other. They can be disposed in the same film layer. For example, they can be made of different materials and formed on the substrate 100 through two different processes. This can reduce the thickness of the film layer and is beneficial for making the display panel thinner. Of course, the first common electrode 101 and the second common electrode 102 can also be formed in different film layers. For example, one of the first common electrode 101 or the second common electrode 102 can be formed on the substrate 100 first, and then an insulating layer can be formed on it. Then the other one can be formed on the insulating layer. This can avoid the mutual interference between different conductive materials during the formation of the first common electrode 101 and the second common electrode 102, which could cause short circuits or other defects.

[0061] In some embodiments, such as Figure 2 and Figure 3 As shown, the driving substrate 10 also includes: a thin film transistor 106, a gate line 107, and a data line 108 located on the substrate 100; the gate 1061 of the thin film transistor is electrically connected to the gate line 107, the source 1062 is electrically connected to the beginning of the conductive coil 1030, and the drain 1063 is electrically connected to the data line 108.

[0062] The thin-film transistor 106 may include a gate 1061, a gate insulating layer 1064, an active layer 1065, an interlayer insulating layer 1066, a source 1062, and a drain 1063 sequentially disposed on a substrate 100. The source 1062 and the drain 1063 may be disposed on the same layer. The gate 1061 may be electrically connected to the gate line 107 to control the conduction and shutdown between the source 1062 and the drain 1063. The source 1062 is electrically connected to the beginning of the conductive coil 1030, and the drain 1063 is connected to the data line. The data line 108 is electrically connected. When a working level signal, such as a high-level signal, is input to the gate 1061, the source 1062 and drain 1063 are connected, allowing the data signal transmitted by the data line 108 to be transmitted to the conductive coil 1030 formed by the pixel electrode 103. This creates a capacitor between the conductive coil 1030 and the first common electrode 101, forming a current loop in the conductive coil 1030. This generates a magnetic field that drives the magnetically charged particles 201 to move vertically, achieving a black or white display. Alternatively, a horizontal edge electric field can be formed between the conductive coil 1030 and the second common electrode 102 to drive the magnetic particles to move horizontally, achieving a transparent display.

[0063] It should be noted that the gate turn-on voltage of the thin-film transistor can be set between 10-30V, the turn-off voltage can be set between -10 and -25V, the data signal voltage can be set between ±5V and ±18V, and the voltage of the common electrode signal can be set between ±5V.

[0064] In some embodiments, such as Figure 3 As shown, the first common electrode 101, the gate 1061 of the thin film transistor, and the gate line 107 are disposed on the same layer.

[0065] The first common electrode 101, the gate 1061 of the thin film transistor, and the gate line 107 can be made using the same process and the same materials. For example, a sputtering or vapor deposition process can be used to form a conductive film layer using aluminum or the like, and then an etching process can be used to form the pattern of the first common electrode 101, the gate 1061 of the thin film transistor, and the gate line 107. This can simplify the process steps, reduce the process difficulty, and save on manufacturing costs.

[0066] In some embodiments, the projected area of ​​the second common electrode 102 on the substrate 100 is greater than the projected area of ​​the first common electrode 101 on the substrate 100.

[0067] The first common electrode 101 serves to form a large capacitance with the conductive coil 1030 formed by the pixel electrode 103. The size of the capacitance is directly related to the vertical distance between the first common electrode 101 and the conductive coil 1030. For example, the organic insulating layer 104 between them can be hollowed out to reduce the vertical distance between the first common electrode 101 and the conductive coil 1030, thereby increasing the capacitance between them. The second common electrode 102 serves to form a horizontal edge electric field with the conductive coil 1030 formed by the pixel electrode 103. It is necessary to ensure a large facing area between the second common electrode 102 and the conductive coil 1030 formed by the pixel electrode 103. Therefore, the area of ​​the second common electrode 102 needs to be set large enough to form a strong horizontal edge electric field. In practical applications, the areas of the first common electrode 101 and the second common electrode 102 can be adjusted to minimize the planar space they occupy.

[0068] In some embodiments, the materials of the first common electrode 101 and the second common electrode 102 both include: transparent metal oxide.

[0069] The first common electrode 101 and the second common electrode 102 can be transparent conductive films of transparent metal oxide, such as indium tin oxide (ITO), formed on the substrate 100 using processes such as sputtering and evaporation. In this way, the light reflected by the magnetically charged particles 201 can pass through the first common electrode 101, the second common electrode 102, and the substrate 100 and be perceived by the human eye, thus realizing the display function.

[0070] It should be noted that the magnetic field generated by the driving substrate 10 in this embodiment can be controlled to be generated or eliminated by a thin film transistor. This magnetic field is a non-permanent magnetic field. In addition to being formed by the first common electrode 101 and the conductive coil 1030 as described above, it can also be formed by other means, which will not be listed here.

[0071] In some embodiments, such as Figure 1 As shown, the electronic paper film also includes: electrophoretic solution 202; magnetic charged microparticles 201 are doped into the electrophoretic solution 202.

[0072] The magnetic charged particles 201 can move up and down or horizontally in the electrophoretic solution 202 under the drive of a magnetic field or a horizontal edge electric field, so that the display panel can display black, white or transparent.

[0073] In some embodiments, such as Figure 1 As shown, the electronic paper film also includes: a loading structure 203; magnetic charged microparticles 201 and electrophoretic solution 202 are filled in the loading structure 203.

[0074] The loading structure 203 can more effectively gather the magnetically charged particles 201 and the electrophoretic solution 202, preventing the magnetically charged particles 201 from being too dispersed, thereby improving the display effect. Specifically, the loading structure 203 has a first opening close to the substrate 100 and a second opening away from the substrate 100; the area of ​​the first opening is smaller than that of the second opening, which allows the magnetically charged particles 201 to be further gathered during movement, which is beneficial to improving the display effect. In practical applications, the loading structure 203 is a microcup structure or a microcapsule structure.

[0075] In some embodiments, the electronic paper film 20 further includes: a first electrode plate (not shown) and a second electrode plate (not shown) disposed opposite to each other; and a loading structure 203 located between the first electrode plate and the second electrode plate.

[0076] Both the first and second electrodes can be transparent to prevent light blockage and improve the transparency of the display panel. The first and second electrodes can be made of the same material. Specifically, the first and second electrodes can be made of non-ferromagnetic materials, such as transparent metal oxides, such as transparent conductive films of indium tin oxide (ITO).

[0077] In some embodiments, the magnetic charged particles 201 include: black magnetic charged particles or red magnetic charged particles.

[0078] Black magnetic charged microparticles absorb visible light, and when they move close to the substrate 100, a black display is achieved. Red magnetic charged microparticles reflect red light from the visible spectrum, and when they move close to the substrate 100, a red display is achieved. In practical applications, either black or red magnetic charged microparticles can be selected, depending on the specific needs. Specifically, the material of the magnetic charged microparticles 201 includes nickel (Ni) or iron oxide (Fe2O3).

[0079] The magnetic charged microparticles 201 can be formed using methods such as vapor-phase condensation, magnetron sputtering, hydrothermal methods, and high-energy ball milling. To form microspheres capable of color display, the nano-magnetic particles can be deposited on the surface of the spheres using chemical plating. The spheres are charged microspheres, which can be positively or negatively charged.

[0080] After depositing nano-magnetic particles on the surface of the sphere, in order to make the sphere display the target color, its surface can be formed with pigments to display the color, such as black or red. The black magnetic charged particles can be black particles deposited in a dopamine dispersion.

[0081] The specific method for depositing a color layer on the surface of the above-mentioned magnetic nanoparticles can be a commonly used method in the industry, such as: after ultrasonic analysis of the small balls with magnetic nanoparticles deposited on the surface in an ethanol dispersion, placing them in a dopamine solution with a concentration of 0.5-4.0 g / L and a pH of 6-10, and stirring at a stirring rate of 50-80 r / min for 6-48 h to obtain magnetic charged microparticles 201 with polydopamine deposited on the surface.

[0082] In some embodiments, such as Figure 1 As shown, the display panel also includes: a support substrate 30; the support substrate 30 is located on the side of the electronic paper film 20 opposite to the driving substrate 10.

[0083] The support substrate 30 can be set in a box with the driving substrate 10, mainly to support the loading structure 203 in the electronic paper film 20. The lower support substrate 30 can be a thin film substrate made of inorganic conductive materials such as ZnO, and does not contain magnetic shielding elements such as iron and nickel.

[0084] Secondly, this disclosure provides a display device, which includes a display panel as provided in any of the above embodiments. The display device includes products or components with display functions, such as e-book readers, electronic tags in shopping malls, advertising display boards, electronic signs, and smart terminals with display capabilities. Its implementation principle and beneficial effects are the same as those of the display panel provided in any of the above embodiments, and will not be described in detail here.

[0085] Thirdly, embodiments of this disclosure provide a method for driving a display panel. Figure 4 A flowchart illustrating a method for driving a display panel, as shown in the embodiments of this disclosure, is provided. Figure 4 As shown, the driving method of the display panel can drive the display panel provided in any of the above embodiments, and the driving method of the display panel includes the following steps S401 to S402.

[0086] S401, apply a voltage to the first common electrode to form a current loop between the first common electrode and the conductive coil, thereby generating a magnetic field perpendicular to the substrate and driving the magnetically charged particles to move toward or away from the substrate.

[0087] S402, apply a voltage to the second common electrode, so that a horizontal edge electric field parallel to the substrate is formed between the second common electrode and the conductive coil, and drive the magnetic charged particles to move toward the periphery or edge of the pixel area.

[0088] A positive voltage signal is input to the pixel electrode 103, and a low voltage signal, the same as that applied to the common electrode in a conventional display panel, is input to the first common electrode 101. No voltage signal is applied to the second common electrode 102. At this time, because the vertical distance between the end of the conductive coil 1030 formed by the pixel electrode 103 and the first common electrode 101 is small, a large capacitance can be formed between the conductive coil 1030 and the first common electrode 101. This capacitance is much larger than that at other locations. Therefore, the voltage drop of the conductive coil 1030 is mainly reduced through the first common electrode 101, creating a voltage difference between them. This capacitance then forms a current loop in the conductive coil 1030. The current in the loop flows from the beginning to the end of the conductive coil 1030, i.e., counterclockwise. According to Ampere's law, the magnetic field generated by the current loop is perpendicular to the substrate 100 and points upwards. Therefore, the magnetically charged particles 201 move towards the substrate 100 (i.e., upwards), achieving a black display.

[0089] A negative voltage signal is input to the pixel electrode 103, and a low voltage signal, the same as that applied to the common electrode in a conventional display panel, is input to the first common electrode 101. No voltage signal is applied to the second common electrode 102. At this time, the conductive coil 1030 formed by the pixel electrode 103 can form a large capacitance with the first common electrode 101. The capacitance value here is much larger than that at other locations. Therefore, the voltage drop of the conductive coil 1030 is mainly reduced through the first common electrode 101, thus creating a voltage difference between the conductive coil 1030 and the first common electrode 101. This capacitance between them forms a current loop in the conductive coil 1030. The current in the current loop flows from the end to the beginning of the conductive coil 1030, i.e., clockwise. According to Ampere's law, the magnetic field generated by the current loop is perpendicular to the substrate 100 and points downwards. Therefore, the magnetically charged particles 201 move in a direction away from the substrate 100 (i.e., downwards), which can hide the magnetically charged particles 201 and achieve a white display.

[0090] A positive voltage signal is input to the pixel electrode 103, no voltage signal is applied to the first common electrode 101, and the second common electrode 102 receives the same low voltage signal as the common electrode in a conventional display panel. Since there is no voltage signal on the first common electrode 101, the conductive coil 1030 cannot form a current loop, and the magnetically charged particles 201 are not driven by the magnetic field. At this time, there is a voltage difference between the conductive coil 1030 formed by the second common electrode 102 and the pixel electrode 103, creating a horizontal edge electric field. Under the influence of this horizontal edge electric field, the magnetically charged particles 201 are driven to the edge or periphery of the pixel area, allowing the display panel to display the image behind it, thus achieving a transparent display effect.

[0091] As can be seen, the driving method for the display panel provided in this embodiment can not only achieve black and white displays, but also transparent displays. This allows it to be applied in technical fields requiring transparent displays, such as transparent shop windows, vehicle displays, and 3D displays, greatly expanding the application scope and scenarios of electronic shelf labels. Furthermore, the magnetic field generated by the driving substrate 10 can drive magnetically charged particles to move vertically, and the horizontal edge electric field can drive the magnetically charged particles to move horizontally. These two fields do not interfere with each other, avoiding display abnormalities caused by mutual interference between the horizontal edge electric and magnetic fields. Therefore, it can improve the display effect and enhance the user experience.

[0092] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0093] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A display panel, wherein, The display panel includes: a driving substrate and an electronic paper film; The driving substrate includes: a substrate, a first common electrode, a second common electrode, and a pixel electrode; the first common electrode and the second common electrode are located on the substrate; the pixel electrode is located on the side of the film layer containing the first common electrode and the second common electrode away from the substrate; the pixel electrode includes: a conductive coil; the electronic paper film includes: magnetically charged microparticles; The vertical distance between the end of the conductive coil and the first common electrode is less than the vertical distance between the portion of the conductive coil other than the end and the second common electrode.

2. The display panel according to claim 1, wherein, An organic insulating layer is provided between the film layer containing the first common electrode and the second common electrode and the conductive coil; The organic insulating layer between the first common electrode and the end of the conductive coil is hollowed out, while the organic insulating layer between the second common electrode and the conductive coil is continuous.

3. The display panel according to claim 2, wherein, The conductive coil includes at least one of the following: a spiral coil and a U-shaped coil.

4. The display panel according to claim 2, wherein, The orthographic projection of the end of the conductive coil onto the substrate at least partially overlaps with the orthographic projection of the first common electrode onto the substrate.

5. The display panel according to claim 2, wherein, The first common electrode and the second common electrode are formed in the same film layer.

6. The display panel according to claim 2, wherein, The driving substrate further includes: thin-film transistors, gate lines, and data lines located on the substrate; The gate of the thin-film transistor is electrically connected to the gate line, the source is electrically connected to the beginning of the conductive coil, and the drain is electrically connected to the data line.

7. The display panel according to claim 6, wherein, The first common electrode, the gate of the thin-film transistor, and the gate line are disposed in the same layer.

8. The display panel according to claim 1, wherein, The projected area of ​​the second common electrode on the substrate is larger than the projected area of ​​the first common electrode on the substrate.

9. The display panel according to claim 1, wherein, The materials of both the first common electrode and the second common electrode include transparent metal oxides.

10. The display panel according to claim 1, wherein, The electronic paper film also includes: electrophoretic solution; The magnetically charged microparticles are doped into the electrophoretic solution.

11. The display panel according to claim 10, wherein, The electronic paper film also includes: a loading structure; The magnetically charged microparticles and the electrophoretic solution are filled in the loading structure.

12. The display panel according to claim 11, wherein, The loading structure has a first opening near the base and a second opening away from the base; The area of ​​the first opening is smaller than the area of ​​the second opening.

13. The display panel according to claim 11, wherein, The loading structure includes a microcup structure or a microcapsule structure.

14. The display panel according to claim 11, wherein, The electronic paper film further includes: a first electrode plate and a second electrode plate disposed opposite to each other; The loading structure is located between the first electrode plate and the second electrode plate.

15. The display panel according to claim 14, wherein, The materials of both the first electrode plate and the second electrode plate include: transparent metal oxide.

16. The display panel according to claim 10, wherein, The magnetic charged particles include: black magnetic charged particles or red magnetic charged particles.

17. The display panel according to claim 10, wherein, The materials of the magnetically charged particles include nickel or iron oxide.

18. The display panel according to claim 1, wherein, The display panel also includes: a supporting substrate; The support substrate is located on the side of the electronic paper film opposite to the driving substrate.

19. The display panel according to claim 18, wherein, The material of the supporting substrate includes: a non-magnetic transparent metal oxide.

20. A display device, wherein, The display device includes a display panel as described in any one of claims 1 to 19.

21. A driving method for a display panel, used to drive the display panel as described in any one of claims 1 to 19, wherein, The driving method for the display panel includes: A voltage is applied to the first common electrode, so that a current loop is formed between the first common electrode and the conductive coil to generate a magnetic field perpendicular to the substrate and drive the magnetically charged particles to move toward or away from the substrate. A voltage is applied to the second common electrode, causing a horizontal edge electric field parallel to the substrate to be formed between the second common electrode and the conductive coil, and driving the magnetically charged particles to move toward the periphery or edge of the pixel area.

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