Display panel and display device

Abstract

The invention provides a display panel and a display device.The display panel comprises a substrate, a driving device layer, a first electrode layer and a light extraction layer, the driving device layer is arranged on one side of the substrate, and the first electrode layer is arranged on the side, away from the substrate, of the driving device layer; the light extraction layer is arranged on the side, away from the substrate, of the first electrode layer, the display panel further comprises a first coil and a second coil, the first coil is arranged in the first electrode layer or arranged between the substrate and the first electrode layer, and the second coil is arranged on the side, away from the substrate, of the light extraction layer; the driving device layer further comprises a thin film transistor, and the first coil and the second coil are electrically connected with the thin film transistor. According to the display panel, the current-carrying coil is arranged in the display panel and is powered on through the thin film transistors, so that the current-carrying coil can generate a magnetic field, and the influence of transverse leakage current in the display panel can be relieved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] In the related art, active metals are doped into the charge generation layer of the OLED display panel to improve the conductivity of the charge generation layer. However, the charge generation layer has a strong conductivity, which will cause the charges in the charge generation layer to be transferred horizontally. Moreover, the aging of the organic materials in the pixel area will further cause the charges to be transferred horizontally. Therefore, when the display panel displays a monochrome picture (i.e., a pure color picture, such as a red picture, a green picture, or a blue picture), the charges transferred horizontally to the adjacent sub-pixels will cause the adjacent sub-pixels to light up, resulting in poor crosstalk, making the monochrome display unsaturated, reducing the color gamut, etc., and affecting the display performance of the display panel.

[0003] In order to control the leakage current between sub-pixels, most of the related technologies use physical isolation to separate the sub-pixels from each other, such as digging grooves between sub-pixels or setting isolation columns, etc. However, these methods cannot completely block the leakage current flow between sub-pixels. Summary of the invention

[0004] Embodiments of the present application provide a display panel and a display device to solve the problem of leakage current between sub-pixels in the related art.

[0005] To solve the above problems, the technical solutions provided by this application are as follows:

[0006] In a first aspect, the present application provides a display panel, comprising:

[0007] substrate;

[0008] A driving device layer, disposed on one side of the substrate;

[0009] A first electrode layer, disposed on a side of the driving device layer away from the substrate;

[0010] A light extraction layer, disposed on a side of the first electrode layer away from the substrate;

[0011] The display panel further includes:

[0012] A first coil is disposed in the first electrode layer or between the substrate and the first electrode layer;

[0013] A second coil is disposed on a side of the light extraction layer away from the substrate;

[0014] The driving device layer includes a thin film transistor, and the first coil and the second coil are electrically connected to the thin film transistor respectively.

[0015] In one embodiment, both the first coil and the second coil include conductive materials, and the polarity of the magnetic field generated by the first coil after being energized is different from the polarity of the magnetic field generated by the second coil after being energized.

[0016] In one embodiment, the current in the first coil and the current in the second coil are of the same magnitude and flow in the same direction.

[0017] In one embodiment, the first coil and the second coil are arranged in parallel and coaxially.

[0018] In one embodiment, in the thickness direction of the display panel, the orthographic projection of the first coil on the substrate completely overlaps with the orthographic projection of the second coil on the substrate.

[0019] In one embodiment, a diameter of the first coil and / or a diameter of the second coil is equal to a distance between the first coil and the second coil.

[0020] In one embodiment, the display panel further includes a plurality of pixels, the pixels include a plurality of sub-pixels, and in a top-view direction of the display panel, the first coil and the second coil are disposed between the sub-pixels.

[0021] In one embodiment, the plurality of sub-pixels include red sub-pixels, green sub-pixels and blue sub-pixels, and in a top-view direction of the display panel, the first coil and the second coil are arranged around a single blue sub-pixel.

[0022] In one embodiment, in a top-view direction of the display panel, the first coil and the second coil are arranged at the periphery of the plurality of sub-pixels.

[0023] In a second aspect, the present application provides a display device, comprising the aforementioned display panel.

[0024] The embodiment of the present application provides a display panel and a display device, wherein the display panel includes a substrate, a driving device layer, a first electrode layer and a light extraction layer, wherein the driving device layer is arranged on one side of the substrate, the first electrode layer is arranged on a side of the driving device layer away from the substrate, and the light extraction layer is arranged on a side of the first electrode layer away from the substrate, and the display panel also includes a first coil and a second coil, wherein the first coil is arranged in the first electrode layer or between the substrate and the first electrode layer, and the second coil is arranged on a side of the light extraction layer away from the substrate, wherein the driving device layer also includes a thin film transistor, and the first coil and the second coil are electrically connected to the thin film transistor respectively. The present application arranges a current-carrying coil in the display panel and respectively connects electricity through the thin film transistor, so that the current-carrying coil can generate a magnetic field, thereby being able to mitigate the influence of lateral leakage current in the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Attached Figure 1 This is a schematic diagram of a module structure of an optional display panel in an embodiment of the present application;

[0027] Attached Figure 2 This is a schematic diagram of the structure of a driving device layer in an optional display panel in an embodiment of the present application;

[0028] Attached Figure 3 This is a schematic diagram of the working principle of an optional first coil and a second coil in an embodiment of the present application;

[0029] Attached Figure 4 This is a schematic diagram of the structure of an optional pixel array in an embodiment of the present application;

[0030] Attached Figure 5 This is another optional schematic diagram of the working principle of the first coil and the second coil in the embodiment of the present application;

[0031] Attached Figure 6 Schematic diagram of the running trajectory of the leakage current in the embodiment of the present application;

[0032] Attached Figure 7 Schematic diagram of the structure of an optional display device in an embodiment of the present application.

[0033] Description of reference numerals in the figures:

[0034] 1. display device; 10. display panel; 10a. sub-pixel;

[0035] 100, substrate; 200, driving device layer; 300, first electrode layer; 400, light extraction layer; 500, first coil; 600, second coil. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] It will be understood that the terms “comprises” and / or “comprising” used herein specify the presence of stated features or components, but do not exclude the presence or addition of one or more other features or components.

[0038] It will be understood that when a layer, region or component is referred to as being “formed on” another layer, region or component, it may be directly or indirectly formed on the other layer, region or component. For example, intervening layers, regions or components may be present.

[0039] Reference Figure 1 As shown, according to a first aspect of the present application, a display panel 10 is provided, comprising:

[0040] The substrate 100 is used to support the various layers arranged on the substrate 100. Depending on the emission type of the display device 1, the substrate 100 may be a transparent substrate 100, a translucent substrate 100 or an opaque substrate 100. In some embodiments, the substrate 100 is made of an insulating material such as glass, quartz or a polymer resin. Examples of polymer materials include: polyethersulfone (PES), polyacrylate (PA), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP) or a combination thereof; in some other embodiments, the substrate 100 may also include a metal.

[0041] In some embodiments of the present application, the substrate 100 may be a rigid substrate 100 or a flexible substrate 100 that can be bent, folded, rolled, etc. Examples of flexible materials for the flexible substrate 100 include polyimide (PI), but are not limited to polyimide (PI).

[0042] The driving device layer 200 is disposed on one side of the substrate 100. For details, refer to Figure 2 As shown, the driving device layer 200 includes a barrier layer (Barrier), a buffer layer (Buffer), a semiconductor, a gate insulating layer (GI), a gate electrode, a first interlayer insulating layer (ILD1), a source electrode and a drain electrode, a second interlayer insulating layer (ILD2), etc. Among them, the gate electrode, the source electrode and the drain electrode are respectively the control electrode, the input electrode and the output electrode of the thin film transistor in the driving circuit of the display panel 10, and form a thin film transistor together with the semiconductor, and the semiconductor of the thin film transistor includes a channel located between the source electrode and the drain electrode.

[0043] The first electrode layer 300 is disposed on a side of the driving device layer 200 away from the substrate 100. Specifically, the first electrode layer 300 may be an anode of an organic light emitting diode of the display panel 10. It should be noted that the first electrode layer 300 is actually formed on the second interlayer insulating layer or the flat layer, and passes through a through hole on the second interlayer insulating layer to form an electrical connection with the drain electrode.

[0044] The light extraction layer 400 is arranged on the side of the first electrode layer 300 away from the substrate 100. More specifically, the light extraction layer 400 is usually arranged on the second electrode layer to reduce the light loss caused by repeated reflection of light emitted by the light-emitting structure between the first electrode layer 300 and the second electrode layer, thereby improving the light extraction efficiency of the display panel 10.

[0045] Among them, the display panel 10 of the present application also includes a first coil 500 and a second coil 600, wherein the first coil 500 is arranged in the first electrode layer 300 or between the substrate 100 and the first electrode layer 300, that is, the first coil 500 can be arranged in any layer of the above-mentioned driving device layer 200, such as it can be arranged in any layer of the blocking layer, the buffer layer, the semiconductor, the gate insulating layer, the gate electrode layer, the first interlayer insulating layer, the source-drain electrode layer and the second interlayer insulating layer.

[0046] The second coil 600 is arranged on the side of the light extraction layer 400 away from the substrate 100. In some embodiments, the second coil 600 can be arranged in the encapsulation layer. Specifically, the encapsulation layer can be arranged on the light extraction layer 400, and can be formed by alternately laminating one or more organic layers and one or more inorganic layers. Multiple inorganic layers or organic layers can be provided each. Among them, the organic layer is formed by a polymer, and can be, for example, a monomer composition that can also include a monomer based on a monoacrylate. In addition, the monomer composition can also include a well-known photoinitiator such as TPO, but the monomer composition is not limited thereto. The inorganic layer can be a laminated layer or a single layer including a metal oxide or a metal nitride. For example, the inorganic layer can include any one of SiNx, Al2O3, SiO2 and TiO2. The uppermost layer of the encapsulation layer exposed to the outside can be formed by an inorganic layer to prevent moisture from being transmitted to the inside of the organic light emitting diode display. The encapsulation layer may include at least one sandwich structure, in which at least one organic layer is interposed between at least two inorganic layers. In addition, the encapsulation layer may include at least one sandwich structure in which at least one inorganic layer is interposed between at least two organic layers, and the second coil 600 may be disposed in the inorganic layer or the organic layer of the encapsulation.

[0047] It should be noted that the size range of the first coil 500 and the second coil 600 can cover the pixel area or be only arranged on a path in any direction between sub-pixels.

[0048] It should be noted that in the above embodiment, the first coil 500 and the second coil 600 also need to be electrically connected to the thin film transistor respectively. Through this solution, the thin film transistor can apply current to the first coil 500 and the second coil 600 so that the first coil 500 and the second coil 600 generate a magnetic field in the pixel area. It is easy to understand that when the thin film transistor applies current to the first coil 500 and the second coil 600, according to Ampere's law, the first coil 500 and the second coil 600 can generate a magnetic field inside the first coil 500 and the second coil 600, and the direction of the magnetic field will be at a certain angle to the plane where the substrate 100 is located.

[0049] It should be noted that a pixel defining layer, an organic emission layer and a second electrode layer are further provided between the first electrode layer 300 and the light extraction layer 400 .

[0050] The pixel defining layer is disposed on the first electrode layer 300 and has an opening, and the first electrode layer 300 is exposed through the pixel defining layer. The pixel defining layer may be formed to include a resin such as polyacrylate or polyimide, a silica-based organic material, or the like.

[0051] An organic emission layer is formed in the opening of the pixel defining layer. The organic emission layer is formed by a plurality of layers including one or more emission layers, a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). In the case where the organic emission layer includes all of the above layers, the hole injection layer (HIL) may be located on the first electrode layer 300, and the hole transport layer (HTL), the emission layer, the electron transport layer (ETL), and the electron injection layer (EIL) may be sequentially laminated on the hole injection layer (HIL).

[0052] The second electrode layer is formed on the pixel defining layer and the organic emission layer. The second electrode is the cathode of the organic light emitting diode. Therefore, the first electrode, the organic emission layer and the second electrode form an organic light emitting element.

[0053] On this basis, refer to Figure 6 As shown, when the charges (electrons or holes) in the organic emission layer of the present application are transmitted laterally (in a direction parallel to the substrate 100), since the direction of the magnetic field is at a certain angle to the plane where the substrate 100 is located, the magnetic field will generate a Lorentz force on the electrons or holes, thereby changing the direction of movement of the electrons or holes, causing the electrons or holes to perform spiral motion, which greatly increases the range of the electrons or holes, limits the lateral transmission of the electrons or holes, reduces the brightness of adjacent pixels, avoids crosstalk, improves the saturation and color gamut of the monochrome display, and improves the display quality of the display panel 10.

[0054] It is easy to understand that, since the charge polarities of electrons and holes are opposite, the directions of the Lorentz forces generated by the magnetic field on electrons and holes are different, so that electrons or holes move separately from each other during the spiral motion.

[0055] Reference Figure 3 As shown, in some embodiments of the present application, the direction of the magnetic field is perpendicular to the substrate 100. When the direction of the magnetic field is perpendicular to the substrate 100, the direction of the magnetic field is parallel to the direction of the holes or electrons used for emitting light, so that the magnetic field will not generate a Lorentz force on the holes or electrons used for emitting light, and will not have an adverse effect on the normal display of the display panel 10.

[0056] In some embodiments of the present application, the first coil 500 and the second coil 600 further include conductive materials, and the polarities of the first coil 500 and the second coil 600 are different. It should be noted that the first coil and the second coil can generate a magnetic field after being energized. In some embodiments, the first coil and the second coil have a large number of turns. When the winding directions of the two coils are different, the polarity of the magnetic field generated by the first coil and the second coil will be affected. In some other embodiments, the flow direction of the current in the first coil and the second coil is different. In these embodiments, even if the winding directions of the coils are the same, the different flow directions of the current will also cause the polarity of the magnetic field generated by the first coil and the second coil to be different. In addition, in some embodiments, a sheet-shaped S-pole magnetic material can also be embedded under the first electrode layer 300 (anode) and an N-pole magnetic material can be embedded on the packaging layer; or a sheet-shaped N-pole magnetic material can also be embedded under the first electrode layer 300 (anode) and an S-pole magnetic material can be embedded on the packaging layer. By setting the magnetic material, the magnetic field strength of the first coil or the second coil can be increased to a certain extent.

[0057] The display panel 10 further includes a plurality of pixels, each pixel includes a plurality of sub-pixels 10 a . In a top view of the display panel 10 , the first coil 500 and the second coil 600 are disposed between the sub-pixels 10 a .

[0058] Specifically, as some embodiments of the positions of the first coil 500 and the second coil 600, refer to Figure 3 As shown, the first coil 500 and the second coil 600 can be arranged in a non-pixel area where leakage current passes between pixel areas.

[0059] As other embodiments of the positions of the first coil 500 and the second coil 600, refer to Figure 4 and Figure 5As shown, in the top view direction of the display panel 10, the first coil 500 and the second coil 600 are arranged at the periphery of one or more sub-pixels 10a. In this embodiment, the multiple sub-pixels 10a include red sub-pixels 10a, green sub-pixels 10a and blue sub-pixels 10a. Since the blue sub-pixel 10a usually has a higher energy level, it is easier for the blue sub-pixel 10a to generate leakage current to other sub-pixels 10a than sub-pixels 10a of other colors. Therefore, in some embodiments, the first coil 500 and the second coil 600 are arranged at the periphery of the blue sub-pixel 10a.

[0060] In some embodiments of the present application, in order to make the magnetic field more uniform, the first coil 500 and the second coil 600 are arranged in parallel and coaxially, and the current in the first coil 500 and the second coil 600 is the same in magnitude and the current flow direction is the same. Through such an arrangement, the direction of the generated magnetic field is the same along the axis, which is easy to control and apply. In this embodiment, in order to make the polarity of the magnetic field generated by the first coil 500 and the second coil 600 different after being energized, the first coil 500 and the second coil 600 adopt different winding directions. In addition, the radius of the first coil 500 and the second coil 600 are the same, and the number of turns is also the same. In the thickness direction of the display panel 10, the orthographic projection of the first coil 500 on the substrate 100 completely overlaps with the orthographic projection of the second coil 600 on the substrate 100. In some embodiments, the diameter of the first coil 500 and / or the diameter of the second coil 600 is equal to the distance between the first coil 500 and the second coil 600. In this embodiment, by adjusting the current of the first coil 500 and the second coil 600 and utilizing the magnetic field superposition principle, the magnetic field in the middle area of ​​the two coils can be significantly uniformed. In a larger area near the midpoint of the center line of the first coil 500 and the second coil 600, the magnetic field is approximately uniform. It should be noted that the larger the radius of the first coil 500 and the second coil 600, the larger the uniform area, and correspondingly, the magnetic field strength will decrease accordingly.

[0061] Reference Figure 7 As shown, according to the second aspect of the present application, a display device 1 is provided. The display device 1 has all the beneficial effects of the aforementioned display panel 10, which will not be described in detail herein.

[0062] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A display panel, characterized in that: include: substrate; A driving device layer, disposed on one side of the substrate; A first electrode layer, disposed on a side of the driving device layer away from the substrate; A light extraction layer, disposed on a side of the first electrode layer away from the substrate; The display panel further includes: A first coil is disposed in the first electrode layer or between the substrate and the first electrode layer; A second coil is disposed on a side of the light extraction layer away from the substrate; The driving device layer includes a thin film transistor, and the first coil and the second coil are electrically connected to the thin film transistor respectively.

2. The display panel according to claim 1, characterized in that: The first coil and the second coil both include conductive materials, and the polarity of the magnetic field generated when the first coil is energized is different from the polarity of the magnetic field generated when the second coil is energized.

3. The display panel according to claim 1, characterized in that: The current in the first coil and the current in the second coil are the same in magnitude and flow direction.

4. The display panel according to claim 1, characterized in that: The first coil and the second coil are arranged in parallel and coaxially.

5. The display panel according to claim 1, characterized in that: In the thickness direction of the display panel, the orthographic projection of the first coil on the substrate completely overlaps with the orthographic projection of the second coil on the substrate.

6. The display panel according to claim 1, characterized in that: A diameter of the first coil and / or a diameter of the second coil is equal to a distance between the first coil and the second coil.

7. The display panel according to any one of claims 1 to 6, characterized in that: The display panel further includes a plurality of pixels, each pixel includes a plurality of sub-pixels, and in a top-view direction of the display panel, the first coil and the second coil are disposed between the sub-pixels.

8. The display panel according to claim 7, characterized in that: The plurality of sub-pixels include a red sub-pixel, a green sub-pixel and a blue sub-pixel. In a top-view direction of the display panel, the first coil and the second coil are arranged at the periphery of a single blue sub-pixel.

9. The display panel according to claim 7, characterized in that: In a top-view direction of the display panel, the first coil and the second coil are arranged at peripheries of the plurality of sub-pixels.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 9.

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