Display panel and display device

Abstract

The application discloses a display panel and a display device, and relates to the technical field of display, and the display panel comprises a substrate and a plurality of light emitting units located on one side of the substrate, a pixel definition layer is arranged between adjacent light emitting units, the light emitting unit comprises a light emitting structure, the light emitting structure comprises a first hole injection layer, a metal part is arranged on the side of the pixel definition layer away from the substrate, the metal part at least comprises a first metal part which is in the same layer as the first hole injection layer, and the first metal part is connected with a first electric potential, so that the problem that adjacent sub-pixels emit light due to the leakage current of the light emitting unit can be improved, and the chroma of the picture and the display quality are improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a display panel and a display device. Background Technology

[0002] Currently, display technology has permeated all aspects of people's daily lives, and correspondingly, more and more materials and technologies are being used in display panels. Today, the mainstream display panels are mainly liquid crystal displays (LCDs) and organic light-emitting diodes (OLEDs).

[0003] Organic light-emitting diodes (OLEDs), as current-driven light-emitting devices, are increasingly being used in high-performance displays. OLED display panels possess many excellent characteristics such as self-illumination, wide viewing angle, fast response speed, high contrast, wide color gamut, low energy consumption, thin panel, rich colors, flexible display capability, and wide operating temperature range. Therefore, they are hailed as the next-generation "star" flat panel display technology.

[0004] An OLED display panel includes an anode and a cathode, as well as a hole transport layer, an organic light-emitting layer, and an electron transport layer disposed between the anode and the cathode. The anode provides hole injection, and the cathode provides electron injection. Driven by an external voltage, the holes and electrons injected by the cathode and anode recombine in the organic light-emitting layer to form electron-hole pairs (i.e., excitons) at bound energy levels. The excitons radiate de-excitation and emit photons, producing visible light.

[0005] OLED display panels can be broadly classified into two categories based on their driving method: Passive Matrix OLED (PMOLED) and Active Matrix OLED (AMOLED). AMOLED display panels feature pixels arranged in an array, with each pixel driven by a driving circuit consisting of several thin-film transistors and capacitors. This type of display is active-matrix and boasts high luminous efficiency. AMOLED is a current-driven device; when current flows through the organic light-emitting diode (OLED), the OLED emits light, and the brightness is determined by the current flowing through the OLED itself. However, current AMOLED display panels suffer from lateral leakage current, causing color crosstalk and degrading the display quality.

[0006] Therefore, there is an urgent need to provide a display panel and display device that can improve color crosstalk caused by lateral leakage. Summary of the Invention

[0007] In view of this, the present invention provides a display panel and a display device for improving the problem of color crosstalk caused by lateral leakage.

[0008] On one hand, the present invention provides a display panel, comprising:

[0009] substrate,

[0010] Multiple light-emitting units are located on one side of the substrate, and a pixel definition layer is included between adjacent light-emitting units. The light-emitting colors of two adjacent light-emitting units are different.

[0011] The light-emitting unit includes an anode, a light-emitting structure located on the side of the anode away from the substrate, and a cathode located on the side of the light-emitting structure away from the substrate. The light-emitting structure includes a first hole injection layer located on the side of the anode away from the substrate, a first hole transport layer located on the side of the first hole injection layer away from the substrate, a first light-emitting material layer located on the side of the first hole transport layer away from the substrate, a first hole blocking layer located on the side of the first light-emitting material layer away from the substrate, and an electron transport layer located on the side of the first hole blocking layer away from the substrate. A metal portion is included on the side of the pixel definition layer away from the substrate. The metal portion includes at least a first metal portion in the same layer as the first hole injection layer. The metal portion is connected to a first potential.

[0012] On the other hand, the present invention also provides a display panel, comprising: a substrate,

[0013] Multiple light-emitting units are located on one side of the substrate, and a pixel definition layer is included between adjacent light-emitting units. The light-emitting colors of two adjacent light-emitting units are different.

[0014] The light-emitting unit includes an anode, a light-emitting structure located on the side of the anode away from the substrate, and a cathode located on the side of the light-emitting structure away from the substrate. The light-emitting structure includes a first hole injection layer located on the side of the anode away from the substrate, a first hole transport layer located on the side of the first hole injection layer away from the substrate, a first light-emitting material layer located on the side of the first hole transport layer away from the substrate, a first hole blocking layer located on the side of the first light-emitting material layer away from the substrate, a first n-type charge generation layer located on the side of the first n-type charge generation layer away from the substrate, a first p-type charge generation layer located on the side of the first p-type charge generation layer away from the substrate, a second hole transport layer located on the side of the first p-type charge generation layer away from the substrate, a second light-emitting material layer located on the side of the second hole transport layer away from the substrate, a second hole blocking layer located on the side of the second light-emitting material layer away from the substrate, and an electron transport layer located on the side of the second hole blocking layer away from the substrate. A metal portion is included on the side of the pixel definition layer away from the substrate. The metal portion includes at least a third metal portion on the same layer as the first hole transport layer, the second hole transport layer, and / or the first p-type charge generation layer. The metal portion is connected to a second potential.

[0015] On the other hand, the present invention provides a display panel, comprising: a substrate

[0016] Multiple light-emitting units are located on one side of the substrate, and a pixel definition layer is included between adjacent light-emitting units. The light-emitting colors of two adjacent light-emitting units are different.

[0017] The light-emitting unit includes an anode, a light-emitting structure located on the side of the anode away from the substrate, and a cathode located on the side of the light-emitting structure away from the substrate. The light-emitting structure includes a first hole injection layer located on the side of the anode away from the substrate, a first hole transport layer located on the side of the first hole injection layer away from the substrate, a first light-emitting material layer located on the side of the first hole transport layer away from the substrate, a first hole blocking layer located on the side of the first light-emitting material layer away from the substrate, a first n-type charge generation layer located on the side of the first n-type charge generation layer away from the substrate, a first p-type charge generation layer located on the side of the first n-type charge generation layer away from the substrate, a second hole transport layer located on the side of the first p-type charge generation layer away from the substrate, a second light-emitting material layer located on the side of the second hole transport layer away from the substrate, and a cathode located on the side of the second light-emitting material layer away from the substrate. The pixel definition layer includes a second hole blocking layer on one side of the substrate, a second n-type charge generating layer on the side of the second hole blocking layer away from the substrate, a second p-type charge generating layer on the side of the second n-type charge generating layer away from the substrate, a third hole transport layer on the side of the second p-type charge generating layer away from the substrate, a third light-emitting material layer on the side of the third hole transport layer away from the substrate, a third hole blocking layer on the side of the third light-emitting material layer away from the substrate, and an electron transport layer on the side of the third hole blocking layer away from the substrate. A metal portion is included on the side of the pixel definition layer away from the substrate. The metal portion includes at least a fifth metal portion on the same layer as the first hole transport layer, the first p-type charge generating layer, the second hole transport layer, the second p-type charge generating layer, and / or the third hole transport layer. The metal portion is connected to a third potential.

[0018] On the other hand, the present invention also provides a display device including any of the display panels described above.

[0019] Compared with the prior art, the display panel and display device provided by the present invention achieve at least the following beneficial effects:

[0020] The display panel of this invention includes a substrate and a plurality of light-emitting units located on one side of the substrate. A pixel definition layer is included between any two adjacent light-emitting units. The light-emitting colors of adjacent light-emitting units are different. Each light-emitting unit includes an anode, a cathode, and a light-emitting structure located between the anode and cathode. The light-emitting structure includes a first hole injection layer, a first hole transport layer, a first light-emitting material layer, a first hole blocking layer, and an electron transport layer stacked on the anode. The anode provides hole injection, and the cathode provides electron injection. Under the drive of an external voltage, holes and electrons injected by the cathode and anode recombine in the organic light-emitting layer to form electron-hole pairs (i.e., excitons) at bound energy levels. The excitons radiate de-excited and emit photons, producing visible light. Since there are many film layers between the anode and cathode, and the distance between them is relatively large, the voltage of the anode will produce different degrees of voltage drop in each layer. To ensure the light-emitting structure emits light, the voltage of the anode needs to be sufficiently high. When the voltage of the anode is sufficiently high, holes will not only be injected in the direction perpendicular to the substrate, but will also move to adjacent light-emitting units in the lateral direction. Holes are injected in the first hole injection layer. These holes are positively charged. If they leak into adjacent light-emitting units, a voltage difference will be formed with the cathode in the adjacent light-emitting unit, causing the adjacent light-emitting unit to be lit, resulting in color crosstalk. In this invention, a metal part is included on the side of the pixel definition layer away from the substrate. The metal part includes at least a first metal part in the same layer as the first hole injection layer. The metal part is connected to a first potential. When the light-emitting unit lit therein generates lateral leakage, the holes will be discharged through the first metal part to prevent the adjacent light-emitting unit from being lit, thereby improving the problem of color crosstalk in the display panel.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0022] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0024] Figure 1 This is a schematic diagram of the structure of a display panel in related technologies;

[0025] Figure 2 This is a schematic diagram of a planar structure of a display panel provided by the present invention;

[0026] Figure 3 yes Figure 2 A cross-sectional view along line A-A' in the middle;

[0027] Figure 4 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0028] Figure 5 This invention provides a signal timing diagram for a first potential.

[0029] Figure 6 This is yet another signal timing diagram of the first potential provided by the present invention;

[0030] Figure 7 This is yet another signal timing diagram of the first potential provided by the present invention;

[0031] Figure 8 This is a planar structural diagram of another display panel provided by the present invention;

[0032] Figure 9 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0033] Figure 10 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0034] Figure 11 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0035] Figure 12 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0036] Figure 13 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0037] Figure 14 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0038] Figure 15 yes Figure 2 Another cross-sectional view along the A-A' direction;

[0039] Figure 16 This is a schematic diagram of the planar structure of the display device provided in an embodiment of the present invention. Detailed Implementation

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0041] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0042] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0043] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0045] In view of the problem of color crosstalk caused by lateral leakage in AMOLED display panels in related technologies, the inventors have conducted the following research on related technologies, referring to... Figure 1 , Figure 1 This is a schematic diagram of the structure of a display panel in related technologies. Figure 1 The display panel includes a substrate 020, which includes a substrate 014 and driving transistors 013 located on the substrate 014. Each driving transistor 013 is electrically connected to a light-emitting unit. Figure 1 The image shows three adjacent light-emitting units: light-emitting unit 001, light-emitting unit 002, and light-emitting unit 003. The light-emitting colors of light-emitting units 001, 002, and 003 are all different, and can be R, G, and B. Each light-emitting unit includes an anode 009, a hole transport layer 010 on the anode 009, a light-emitting material layer 011 on the hole transport layer 010, and a cathode 012 on the light-emitting material layer 011. The light-emitting material layer 011 in light-emitting units 001, 002, and 003 emits different colors. A pixel definition layer 005 separates adjacent light-emitting units. The anode 009 provides hole injection, and the cathode 012 provides electron injection. Driven by an external voltage, the holes and electrons injected by the anode 009 and cathode 012 recombine in the light-emitting material layer 011, forming electron-hole pairs (i.e., excitons) at bound energy levels. The excitons radiate de-excitation, emitting photons and producing visible light. Figure 1 As can be seen, the light-emitting material layers 011 in light-emitting units 001, 002, and 003 are disconnected from each other, but the other film layers are shared, meaning they are completely covered. This creates a chance of leakage, which is most noticeable in lateral leakage. Figure 1It is known that there are many film layers between the anode 009 and the cathode 012, and the distance between them is relatively large. The voltage of the anode 009 will produce different degrees of voltage drop in each film layer. Therefore, to ensure that the light-emitting unit emits light, the voltage of the anode 009 needs to be large enough. When the voltage of the anode 009 is large enough, holes will not only propagate in the direction perpendicular to the substrate 020, but also propagate to adjacent light-emitting units in the lateral direction X. Figure 1 In the middle (direction of the arrow), when the light-emitting unit 001 emits light, a certain amount of holes will move towards the light-emitting unit 002. The hole transport layer 010 transmits holes, which are positively charged. If the holes in the light-emitting unit 001 leak into the light-emitting unit 002, the positively charged holes in the light-emitting unit 001 and the cathode in the light-emitting unit 002 will recombine in the light-emitting material layer 011 of the light-emitting unit 002, causing the light-emitting unit 002 to be lit up, resulting in color crosstalk.

[0046] In view of this, the present invention provides a display panel and a display device to improve the color crosstalk problem caused by lateral leakage.

[0047] Reference Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of a planar structure of a display panel provided by the present invention. Figure 3 yes Figure 2 A cross-sectional view along line A-A' shows a display panel 1000 in this embodiment, comprising: a substrate 100, a plurality of light-emitting units 200 located on one side of the substrate 100, a pixel definition layer 700 between adjacent light-emitting units 200, and adjacent light-emitting units 200 emitting different colors; each light-emitting unit 200 includes an anode 400, a light-emitting structure located on the side of the anode 400 away from the substrate 100, and a cathode 500 located on the side of the light-emitting structure away from the substrate 100, wherein the light-emitting structure includes a first hole injection layer 601 located on the side of the anode 400 away from the substrate 100, and a cathode 500 located on the side of the light-emitting structure away from the substrate 100. The hole injection layer 601 includes a first hole transport layer 602 on the side away from the substrate 100, a first light-emitting material layer 603 on the side of the first hole transport layer 602 away from the substrate 100, a first hole blocking layer 604 on the side of the first light-emitting material layer 603 away from the substrate 100, and an electron transport layer 616 on the side of the first hole blocking layer 604 away from the substrate 100. The pixel definition layer 700 includes a metal portion 300 on the side away from the substrate 100. The metal portion 300 includes at least a first metal portion 3001 on the same layer as the first hole injection layer 601. The metal portion 300 is connected to a first potential.

[0048] Specifically, the display panel 1000 of the present invention is an organic light-emitting display panel, see reference. Figure 2 , Figure 2 The specific details are shown in the text. Figure 2The display panel 1000 includes a display area AA and a non-display area BB surrounding the display area AA. Figure 2 This only shows the case where the non-display area BB completely surrounds the display area AA. Of course, the non-display area BB can also partially surround the display area AA, such as in a waterdrop screen; this is not a specific limitation here. The non-display area BB includes a top border and a bottom border that are relatively positioned along the second direction Y. The bottom border usually houses the driver chip IC. Figure 2 The display panel 1000 also shows data lines S arranged along a first direction X and extending along a second direction Y, and scan lines G arranged along the first direction X and extending along the second direction Y. Both scan lines G and data lines S are disposed on the substrate 100. The driver chip IC provides data voltage to the data lines S, and the data voltage is written into the driver circuit in the substrate 100 through the transmission of the data lines S. The structure of the driver circuit is not specifically limited here; optionally, the driver circuit can be a 7T1C circuit, as shown in the reference. Figure 3 , Figure 3 The figure shows a substrate 100 including a substrate 101 and a driving transistor M0 located on the side of the substrate 101 near the light-emitting surface of the display panel 1000. The driving transistor M0 includes a gate M01, a source M02 and a drain M03. The substrate 100 includes a substrate 101, an active layer M04, a first metal layer, a second metal layer and a third metal layer in a direction perpendicular to the display panel 1000. The driving transistor M0 includes a gate M01 located in the first metal layer and a source M02 and a drain M03 located in the second metal layer. There is an insulating layer 102 between the first metal layer and the second metal layer, and between the second metal layer and the third metal layer. The substrate 101 and the insulating layer 102 are not patterned in the figure. The data line S is on the same layer as the third metal layer, and the scan line G is on the same layer as the first metal layer.

[0049] The display panel 1000 includes a plurality of light-emitting units 200 located on one side of the substrate 100. Figure 2 The diagram shows a first light-emitting unit 201, a second light-emitting unit 202, and a third light-emitting unit 203 arranged along the first direction X. Optionally, Figure 2The diagram only schematically shows the arrangement of the first light-emitting unit 201, the second light-emitting unit 202, and the third light-emitting unit 203 along the second direction Y. That is, the light-emitting units 200 along the second direction Y have the same light-emitting color. Of course, the light-emitting units 200 along the second direction Y can also have different light-emitting colors, which is not specifically limited here. Each adjacent light-emitting unit 200 includes a pixel definition layer 700, and the light-emitting colors of two adjacent light-emitting units 200 are different. Each light-emitting unit 200 includes an anode 400 and a cathode 500, and a light-emitting structure located between the anode 400 and the cathode 500. The light-emitting structure includes a first hole injection layer 601 located on the side of the anode 400 away from the substrate 100, a first hole transport layer 602 located on the side of the first hole injection layer 601 away from the substrate 100, a first light-emitting material layer 603 located on the side of the first hole transport layer 602 away from the substrate 100, a first hole blocking layer 604 located on the side of the first light-emitting material layer 603 away from the substrate 100, and an electron transport layer 616 located on the side of the first hole blocking layer 604 away from the substrate 100. Figure 3 The first hole injection layer 601, the first hole transport layer 602, the first hole blocking layer 604, and the resistive transport layer are not patterned.

[0050] The anode 400 can be formed from various conductive materials. For example, the anode 400 can be formed as a transparent electrode or a reflective electrode, depending on its application. When the anode 400 is formed as a transparent electrode, it can include indium tin oxide, indium zinc oxide, zinc oxide, or indium oxide, etc.

[0051] The pixel definition layer 700 can be formed from organic materials such as polyimide, polyamide, benzocyclobutene, acrylic resin or phenolic resin.

[0052] The light-emitting structure is located on the anode 400, and this portion of the anode 400 with the light-emitting structure is not covered or exposed by the pixel definition layer 700. The light-emitting structure can be formed by a vapor deposition process, and the light-emitting structure is patterned to correspond to each sub-pixel and the patterned anode 400. The light-emitting structure can be formed from low-molecular-weight organic materials or high-molecular-weight organic materials.

[0053] The cathode 500 is located on the light-emitting structure. Similar to the anode 400, the cathode 500 can be formed as a transparent electrode or a reflective electrode. It is understood that the light-emitting structure includes a hole injection layer on the substrate, a hole transport layer on the hole injection layer, a light-emitting material layer on the hole transport layer, a hole blocking layer on the light-emitting material layer, and an electron transport layer on the hole blocking layer. These layers can be formed by vapor deposition. The light-emitting principle of AMOLED display panels is that organic light-emitting materials emit light through carrier injection and recombination under an electric field. Specifically, OLED display devices typically use indium tin oxide (ITO) pixel electrodes and metal electrodes as the anode and cathode, respectively. Under a certain voltage, electrons and holes are injected from the cathode and anode into the electron transport layer and hole transport layer, respectively. The electrons and holes migrate through the electron transport layer and hole transport layer to the organic light-emitting layer, where they meet, forming excitons and exciting the light-emitting molecules. The latter then emit visible light through radiative relaxation.

[0054] Figure 3 The image also shows an encapsulation layer 800, which is located on the side of the cathode 500 away from the substrate 100 and is used to prevent water and oxygen from entering.

[0055] A metal portion 300 is included on the side of the pixel definition layer 700 away from the substrate 100. The metal portion 300 includes at least a first metal portion 3001 on the same layer as the first hole injection layer 601. The metal portion 300 is connected to a first potential. Figure 2 Taking the first metal portion 3001 extending along the second direction Y and arranged in the first direction X as an example, the first metal portion 3001 is elongated and positioned between two adjacent rows of light-emitting units 200 along the first direction X. This is used to improve the color crosstalk problem caused by lateral leakage between two adjacent light-emitting units 200 along the first direction X. Of course, the first metal portion 3001 can also be arranged between two adjacent rows of light-emitting units 200 along the second direction Y; no specific limitation is made here. Optional, Figure 3 The diagram only shows the metal portion 300, which includes a first metal portion 3001 on the same layer as the first hole injection layer 601. Of course, the metal portion 300 can also be provided on the first hole transport layer 602 simultaneously; no specific limitation is made here. The height of the metal portion 300 in the direction perpendicular to the substrate 100 can be less than or equal to the height of the first hole injection layer 601 in the same direction. No specific limitation is made here on the height of the metal portion 300 in the direction perpendicular to the substrate 100, as long as it can effectively conduct positively charged holes. Lateral leakage in this invention refers to leakage in either the first direction X or the second direction Y.

[0056] During fabrication, before depositing the first hole injection layer 601, a metal portion 300 is deposited on the pixel definition layer 700 using a fine metal mask.

[0057] by Figure 2 Taking the example of the first light-emitting unit 201 emitting light while the second light-emitting unit 202 is lit due to lateral leakage, it can be seen from the above that the reason why the first light-emitting unit 201 emits light while the second light-emitting unit 202 is lit is that the first light-emitting unit 201 emits light due to lateral leakage. The positively charged holes in the first light-emitting unit 201 recombine with the negatively charged electrons in the cathode 500 of the second light-emitting unit 202 in the first light-emitting material layer 603 of the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the first light-emitting material layer 603 of the second light-emitting unit 202 to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, cutting off the recombination path between the holes in the first light-emitting unit 201 and the electrons in the second light-emitting unit 202 can, to a certain extent, prevent this. Since electrons in the cathode 500 of the second light-emitting unit 202 are always present, it is only necessary to cut off the lateral transmission path of holes in the first light-emitting unit 201. In this invention, a metal part 300 is included on the side of the pixel definition layer 700 away from the substrate 100. The metal part 300 includes at least a first metal part 3001 on the same layer as the first hole injection layer 601. The holes in the first hole injection layer 601 are positively charged, and the metal part 300 is connected to the first potential. When the light-emitting unit 200 that is lit generates lateral leakage, the holes in the first hole injection layer 601 will be discharged through the first metal part 3001, cutting off the path of holes flowing to the adjacent light-emitting unit 200. In this way, no holes will be transmitted to the adjacent light-emitting unit 200.

[0058] Compared with the prior art, the display panel of the present invention has at least the following beneficial effects:

[0059] The display panel 1000 of the present invention includes a substrate 100 and a plurality of light-emitting units 200 located on one side of the substrate 100. A pixel definition layer 700 is included between any two adjacent light-emitting units 200. The light-emitting colors of adjacent two light-emitting units are different. Each light-emitting unit 200 includes an anode 400, a cathode 500, and a light-emitting structure located between the anode 400 and the cathode 500. The light-emitting structure includes a first hole injection layer 601, a first hole transport layer 602, a first light-emitting material layer 603, a first hole blocking layer 604, and an electron transport layer 616 stacked on the anode 400. The anode 400 provides holes. Electron injection is provided by cathode 500. Driven by an external voltage, holes and electrons injected by cathode 500 and anode 400 recombine in the organic light-emitting layer, forming electron-hole pairs (i.e., excitons) at bound energy levels. Excitons radiate de-excitation and emit photons, producing visible light. Since there are many film layers and a large distance between anode 400 and cathode 500, the voltage of anode 400 will produce different degrees of voltage drop in each layer. Therefore, to ensure the light-emitting structure emits light, the voltage of anode 400 needs to be sufficiently high. With a sufficiently high voltage of anode 400, holes will not only be injected in the direction perpendicular to substrate 100... Furthermore, it also moves laterally towards adjacent light-emitting units 200. The first hole injection layer 601 injects holes, which are positively charged. If leakage occurs into an adjacent light-emitting unit 200, a voltage difference will be formed with the cathode 500 in that adjacent unit, causing the adjacent unit 200 to light up, resulting in color crosstalk. In this invention, the pixel definition layer 700 includes a metal portion 300 on the side away from the substrate 100. The metal portion 300 includes at least a first metal portion 3001 on the same layer as the first hole injection layer 601. The holes in the first hole injection layer 601 are positively charged, while the metal portion... Section 300 is connected to the first potential. When the light-emitting unit 200 that is lit therein generates lateral leakage, the holes in the first hole injection layer 601 will be discharged through the first metal section 3001, cutting off the path of the holes to the adjacent light-emitting unit 200. In this way, no holes will be transmitted to the adjacent light-emitting unit 200. Even if one of the light-emitting units 200 is lit and lateral leakage occurs, the holes in that light-emitting unit 200 will not recombine with the electrons in the cathode 500 of the adjacent light-emitting unit 200. Therefore, the adjacent light-emitting unit 200 will not be lit, thereby improving the color crosstalk problem of the display panel 1000.

[0060] In some alternative embodiments, refer to Figure 4 , Figure 4 yes Figure 2 Another cross-sectional view along the A-A' direction shows that the metal part 300 also includes a second metal part 3002 on the same layer as the first hole transport layer 602.

[0061] It is understandable that holes are also transmitted in the first hole transport layer 602, so the first hole transport layer 602 is also positively charged. A second metal part 3002 is disposed on the same layer as the first hole transport layer 602, and the second metal part 3002 also needs to be connected to the first potential. When lateral leakage occurs in one of the light-emitting units 200, the simultaneous placement of the first metal part 3001 on the same layer as the first hole injection layer 601 and the second metal part 3002 on the first hole transport layer 602 can completely cut off the lateral transmission path of holes in the first light-emitting unit 201, thus improving the color crosstalk effect caused by lateral leakage.

[0062] In some alternative embodiments, refer to Figure 5 , Figure 5 This invention provides a signal timing diagram of a first potential, wherein the first potential includes at least a negative potential.

[0063] Figure 5 This explanation uses the first potential as an AC signal as an example. At least one period in the signal timing of the first potential is a negative potential. The selectable first potential can be provided by the driver chip, as described above, in conjunction with... Figure 2 The reason why the first light-emitting unit 201 emits light while the second light-emitting unit 202 is lit is that when the first light-emitting unit 201 emits light, there is lateral leakage. The positively charged holes in the first light-emitting unit 201 recombine with the negatively charged electrons in the cathode 500 of the second light-emitting unit 202 in the first light-emitting material layer 603 of the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the first light-emitting material layer 603 of the second light-emitting unit 202 to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, the positively charged holes in the first light-emitting unit 201 should be cut off. The electron recombination path of the second light-emitting unit 202 can be stopped to a certain extent. Since the electrons in the cathode 500 of the second light-emitting unit 202 are always present, it is only necessary to cut off the lateral transmission path of the positively charged holes in the first light-emitting unit 201. The first potential connected to the metal part 300 is negative at least part of the time. When the first potential is negative, the positively charged holes in the first light-emitting unit 201 can be conducted away by the metal part 300 and will not be transmitted to the second light-emitting unit 202, thereby improving the problem of color crosstalk caused by lateral leakage.

[0064] In some alternative embodiments, refer to Figure 6 , Figure 6 This is yet another signal timing diagram of the first potential provided by the present invention. Figure 6 The first potential is a fixed negative potential.

[0065] As mentioned above, combined Figure 2The reason why the first light-emitting unit 201 emits light while the second light-emitting unit 202 is lit is that when the first light-emitting unit 201 emits light, there is lateral leakage. Positively charged holes in the first light-emitting unit 201 recombine with negatively charged electrons in the cathode 500 of the second light-emitting unit 202 in the first light-emitting material layer 603 of the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the first light-emitting material layer 603 of the second light-emitting unit 202, causing them to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, the positively charged holes in the first light-emitting unit 201 and the second light-emitting unit 202 need to be cut off. The electron recombination path can be stopped to a certain extent. Since the electrons in the cathode 500 in the second light-emitting unit 202 are always present, it is only necessary to cut off the lateral transmission path of the positively charged holes in the first light-emitting unit 201. In this embodiment, the first potential connected to the metal part 300 is a fixed negative potential, such as -3V, or the same potential as the cathode 500. In this way, the positively charged holes in the first light-emitting unit 201 can be conducted away by the metal part 300 and will not be transmitted to the second light-emitting unit 202, thereby improving the problem of color crosstalk caused by lateral leakage.

[0066] In some alternative embodiments, refer to Figure 7 , Figure 7 This is another signal timing diagram of the first potential provided by the present invention, wherein the first potential is an AC signal.

[0067] Figure 7 In the AC signal, the time interval between positive and negative charges is equal; no specific limitation is made here, but the duration of the negative charge can be longer than that of the positive charge. As mentioned above, combined with... Figure 2 The reason why the first light-emitting unit 201 emits light while the second light-emitting unit 202 is lit is that when the first light-emitting unit 201 emits light, there is lateral leakage. The positively charged holes in the first light-emitting unit 201 recombine with the negatively charged electrons in the cathode 500 of the second light-emitting unit 202 in the first light-emitting material layer 603 of the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the first light-emitting material layer 603 of the second light-emitting unit 202 to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, the positively charged holes in the first light-emitting unit 201 and the electrons in the second light-emitting unit 202 need to be cut off. The path of sub-recombination can be stopped to a certain extent. Since electrons in the cathode 500 of the second light-emitting unit 202 are always present, it is only necessary to cut off the lateral transmission path of positively charged holes in the first light-emitting unit 201. The first potential connected to the metal part 300 is an AC signal, for example, it can be 0V and -3V alternating. Part of the AC signal is negative at all times. When the AC signal is negative, the positively charged holes in the first light-emitting unit 201 can be conducted away by the metal part 300 and will not be transmitted to the second light-emitting unit 202, thus improving the problem of color crosstalk caused by lateral leakage.

[0068] In some alternative embodiments, reference continues to be made to... Figure 2 and reference Figure 8 , Figure 8 This is a planar structural diagram of another display panel provided by the present invention. The light-emitting units along the first direction X have different colors, and the metal part 300 is arranged along the first direction X and extends along the second direction Y, with the second direction Y intersecting the first direction X.

[0069] Reference Figure 2 , Figure 2 Along the first direction X, any two adjacent light-emitting units 200 have different colors. Therefore, when one of the light-emitting units 200 emits light and generates lateral leakage, the adjacent light-emitting unit 200 will also emit light, resulting in color crosstalk. Thus, the metal part 300 arranged along the first direction X can conduct the positive charge of the leakage, improving the problem of color crosstalk caused by lateral leakage.

[0070] Reference Figure 8 , Figure 8 In this embodiment, the colors of any two adjacent light-emitting units 200 along the row direction are different, and the colors of any two adjacent light-emitting units 200 along the column direction are also different. The metal part 300 provided in this embodiment extends along the row direction and is arranged in the column direction. At the same time, the metal part 300 also extends along the column direction and is arranged in the row direction. Here, the row direction or column direction is the first direction X. When the row direction is the first direction X, the column direction is the second direction Y. When the column direction is the first direction X, the row direction is the second direction Y. Thus, the metal part 300 is provided between any two adjacent light-emitting units 200. Regardless of whether lateral leakage occurs in the first direction X or the second direction Y, the problem of color crosstalk can be improved.

[0071] In some alternative embodiments, reference continues to be made to... Figure 3 Along the first direction X, the distance between the anodes 400 of two adjacent light-emitting units 200 is a, and the width of the metal part 300 along the first direction X is b, where b < a.

[0072] It is understandable that the width of the metal part 300 in the first direction X is such that it cannot cover the anode 400. If the metal part 300 covers the anode 400, that is, the metal part 300 will occupy the space of the first hole injection layer 601 in the light-emitting unit 200, and the light-emitting efficiency of each light-emitting unit 200 will be reduced. Therefore, when the metal part 300 is located on the side of the pixel definition layer 700 away from the substrate 100, the width b of the metal part 300 in the first direction X should be smaller than the distance a between two adjacent anodes 400, so as not to affect the normal light emission of the light-emitting unit 200 in the display panel 1000.

[0073] In some alternative embodiments, reference continues to be made to... Figure 2 The material of the metal part 300 includes aluminum, silver or magnesium-aluminum alloy.

[0074] It is understandable that aluminum, silver, and magnesium-aluminum alloys are all good conductors of electricity. After connecting the metal part 300 to the first potential, it is easy to conduct electrons away from the metal part 300, which can better improve the color crosstalk caused by lateral leakage.

[0075] Based on the same inventive concept, the present invention also provides a display panel, see reference. Figure 2 and Figure 9 , Figure 10 , Figure 11 and Figure 12 , Figure 9 yes Figure 2 Another cross-sectional view along the A-A' direction. Figure 10 yes Figure 2 Another cross-sectional view along the A-A' direction. Figure 11 yes Figure 2 Another cross-sectional view along the A-A' direction. Figure 12 yes Figure 2Another cross-sectional view along line A-A'. The display panel 1000 of this embodiment includes: a substrate 100, a plurality of light-emitting units 200 located on one side of the substrate 100, a pixel definition layer 700 between adjacent light-emitting units 200, and adjacent light-emitting units 200 emitting different colors; each light-emitting unit 200 includes an anode 400, a light-emitting structure located on the side of the anode 400 away from the substrate 100, and a cathode 500 located on the side of the light-emitting structure away from the substrate 100. The light-emitting structure includes a first hole injection layer 601 located on the side of the anode 400 away from the substrate 100, a first hole transport layer 602 located on the side of the first hole injection layer 601 away from the substrate 100, a first light-emitting material layer 603 located on the side of the first hole transport layer 602 away from the substrate 100, a first hole blocking layer 604 located on the side of the first light-emitting material layer 603 away from the substrate 100, and a first hole blocking layer 604 located on the side of the first hole blocking layer 604. The pixel definition layer 700 includes a first n-type charge generating layer 605 on the side away from the substrate 100, a first p-type charge generating layer 606 on the side of the first n-type charge generating layer 605 away from the substrate 100, a second hole transport layer 607 on the side of the first p-type charge generating layer 606 away from the substrate 100, a second light-emitting material layer 608 on the side of the second hole transport layer 607 away from the substrate 100, a second hole blocking layer 609 on the side of the second light-emitting material layer 608 away from the substrate 100, and an electron transport layer 616 on the side of the second hole blocking layer 609 away from the substrate 100. A metal portion 300 is also included on the side of the pixel definition layer 700 away from the substrate 100. The metal portion 300 includes at least a third metal portion 3003 on the same layer as the first hole transport layer 602, the second hole transport layer 607, and / or the first p-type charge generating layer 606. The metal portion 300 is connected to a second potential.

[0076] Specifically, the display panel 1000 in this embodiment is a dual AMOLED display panel, including a first light-emitting material layer 603 and a second light-emitting material layer 608, that is, it has two light-emitting material layers, which can improve the light-emitting efficiency.

[0077] The light-emitting structure of the light-emitting panel in this embodiment includes a first hole injection layer 601 located on the side of the anode 400 away from the substrate 100, a first hole transport layer 602 located on the side of the first hole injection layer 601 away from the substrate 100, a first light-emitting material layer 603 located on the side of the first hole transport layer 602 away from the substrate 100, a first hole blocking layer 604 located on the side of the first light-emitting material layer 603 away from the substrate 100, a first n-type charge generation layer 605 (i.e., n CGL, this layer is electron-rich) located on the side of the first hole blocking layer 604 away from the substrate 100, and a first p-type charge generation layer 606 (i.e., p CGL) located on the side of the first n-type charge generation layer 605 away from the substrate 100. CGL (the hole-rich layer), a second hole transport layer 607 located on the side of the first p-type charge generation layer 606 away from the substrate 100, a second light-emitting material layer 608 located on the side of the second hole transport layer 607 away from the substrate 100, a second hole blocking layer 609 located on the side of the second light-emitting material layer 608 away from the substrate 100, and an electron transport layer 616 located on the side of the second hole blocking layer 609 away from the substrate 100. Figures 9 to 12 The first hole injection layer 601, the first hole transport layer 602, the first hole blocking layer 604, the first n-type charge generation layer 605, the first p-type charge generation layer 606, the second hole transport layer 607, the second hole blocking layer 609, and the electron transport layer 616 are not patterned. Figures 9 to 12 As can be seen, there are more film layers between the anode 400 and the cathode 500. At this time, a charge generation layer with extremely strong charge transport capability is needed to connect the different light-emitting material layers. Because of its extremely strong charge transport capability, the accompanying lateral leakage current is also very large. The severity of this lateral leakage current is more serious and obvious than the leakage current of the unit device.

[0078] Figure 9 The middle metal section 300 includes a third metal section 3003 on the same layer as the first hole transport layer 602.

[0079] Figure 10 The middle metal section 300 includes a third metal section 3003 on the same layer as the second hole transport layer 607.

[0080] Figure 11 The middle metal portion 300 includes a third metal portion 3003 on the same layer as the first p-type charge generation layer 606. Figure 12The middle metal portion 300 includes a third metal portion 3003 on the same layer as the first hole transport layer 602, the second hole transport layer 607, and the first p-type charge generation layer 606. Alternatively, the metal portion 300 may include a third metal portion 3003 on the same layer as the first hole transport layer 602 and the second hole transport layer 607 (not shown in the figure), or the metal portion 300 may include a third metal portion 3003 on the same layer as the second hole transport layer 607 and the first p-type charge generation layer 606 (not shown in the figure), or the metal portion 300 may include a third metal portion 3003 on the same layer as the first hole transport layer 602 and the first p-type charge generation layer 606 (not shown in the figure).

[0081] Optionally, during fabrication, before depositing the first hole transport layer, a third metal portion 3003 is deposited at the position corresponding to the pixel definition layer using a fine metal mask; or before depositing the second hole transport layer 607, a third metal portion 3003 is deposited using a fine metal mask; or before depositing the first p-type charge generation layer 606, a third metal portion 3003 is deposited at the position corresponding to the pixel definition layer using a fine metal mask.

[0082] It is understandable that when the light-emitting unit 200 emits light, lateral leakage occurs. Positively charged holes in the first light-emitting unit 201 recombine with negatively charged electrons in the cathode 500 of the second light-emitting unit 202 within the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the second light-emitting unit 202, causing it to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, it is necessary to cut off the hole transport path. In the binary AMOLED display panel 1000 of this embodiment, the first hole transport layer 6... 02. Since the three film layers, namely the second hole transport layer 607, the first p-type charge generation layer 606, all contain positively charged holes, a metal part 300 is provided on the side of the pixel definition layer 700 away from the substrate 100. The metal part 300 is placed on the same layer as any one, two, or three of the first hole transport layer 602, the second hole transport layer 607, and the first p-type charge generation layer 606. The metal part 300 can conduct out the positive charge that leaks laterally, thereby improving the problem of color crosstalk caused by lateral leakage.

[0083] In some alternative embodiments, refer to Figure 13 , Figure 13 yes Figure 2 Another cross-sectional view along the A-A' direction shows that the metal part 300 also includes a fourth metal part 3004 in the same layer as the first hole injection layer 601.

[0084] It is understandable that holes also exist in the first hole injection layer 601. These holes are positively charged. When lateral leakage occurs in the holes in the first hole injection layer 601, it will cause adjacent light-emitting units 200 to emit light, causing crosstalk. In this embodiment, on the side of the pixel definition layer 700 away from the substrate 100, a fourth metal part 3004 is provided at the same position as the first hole injection layer 601 with abundant holes. The fourth metal part 3004 is located between two adjacent light-emitting units 200. The holes that have lateral leakage in the first hole injection layer 601 are discharged through the metal part 300, thereby improving the problem of color crosstalk.

[0085] In some alternative embodiments, a metal portion 300 may be disposed in the same layer as the first n-type charge generation layer 605 in the pixel definition layer 700. Since the first n-type charge generation layer 605 has an excess of electrons, the potential connected to the metal portion 300 needs to be positive in order to extract the excess electrons from the first n-type charge generation layer 605.

[0086] In some alternative embodiments, reference continues to be made to... Figure 5 The second potential includes at least a negative potential.

[0087] The second potential in this embodiment can be referred to Figure 5 The waveform of the first potential is the same as that of the second potential; no specific limitation is made here. Figure 2 The reason why the first light-emitting unit 201 emits light while the second light-emitting unit 202 is lit is that when the first light-emitting unit 201 emits light, there is lateral leakage. Positively charged holes in the first light-emitting unit 201 recombine with negatively charged electrons in the cathode 500 of the second light-emitting unit 202 in the first light-emitting material layer 603 and / or the second light-emitting material layer 608 of the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the first light-emitting material layer 603 and / or the second light-emitting material layer 608 of the second light-emitting unit 202, causing them to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, the first light-emitting unit 201 needs to be cut off. The path of recombination between positively charged holes in the light-emitting unit 201 and electrons in the second light-emitting unit 202 can be prevented to a certain extent. Since electrons in the cathode 500 in the second light-emitting unit 202 are always present, it is only necessary to cut off the lateral transmission path of positively charged holes in the first light-emitting unit 201. The second potential connected to the metal part 300 is negative at least part of the time. When the second potential is negative, the positively charged holes in the first light-emitting unit 201 can be conducted away by the metal part 300 and will not be transmitted to the second light-emitting unit 202, thereby improving the problem of color crosstalk caused by lateral leakage.

[0088] In some alternative embodiments, reference continues to be made to... Figure 6 The second potential is a fixed negative potential.

[0089] The optional fixed negative potential can be the same as the anode 400 voltage; no specific limitation is made here. As mentioned above, combined with Figure 2 The reason why the first light-emitting unit 201 emits light while the second light-emitting unit 202 is lit is that when the first light-emitting unit 201 emits light, there is lateral leakage. The positively charged holes in the first light-emitting unit 201 recombine with the negatively charged electrons in the cathode 500 of the second light-emitting unit 202 in the first light-emitting material layer 603 and / or the second light-emitting material layer 608 of the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the first light-emitting material layer 603 and / or the second light-emitting material layer 608 of the second light-emitting unit 202 to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, the first light-emitting unit 201 needs to be switched off. The path of recombination between positively charged holes in unit 201 and electrons in the second light-emitting unit 202 can be prevented to a certain extent. Since electrons in the cathode 500 of the second light-emitting unit 202 are always present, it is only necessary to cut off the lateral transmission path of positively charged holes in the first light-emitting unit 201. In this embodiment, the second potential connected to the metal part 300 is a fixed negative potential, such as -3V. In this way, the positively charged holes in the first light-emitting unit 201 can be conducted away by the metal part 300 and will not be transmitted to the second light-emitting unit 202, thereby improving the problem of color crosstalk caused by lateral leakage.

[0090] In some alternative embodiments, reference continues to be made to... Figure 11 and Figure 7 The second potential input to the third metal part 3003 of the same layer as the first p-type charge generation layer 606 is an AC signal.

[0091] As mentioned above, combined Figure 2 The reason why the first light-emitting unit 201 emits light while the second light-emitting unit 202 is lit is that when the first light-emitting unit 201 emits light, there is lateral leakage. Positively charged holes in the first light-emitting unit 201 recombine with negatively charged electrons in the cathode 500 of the second light-emitting unit 202 in the first light-emitting material layer 603 and / or the second light-emitting material layer 608 of the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the first light-emitting material layer 603 and / or the second light-emitting material layer 608 of the second light-emitting unit 202, causing them to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, the first light-emitting unit 201 needs to be switched off. The path of recombination between positively charged holes in the first light-emitting unit 201 and electrons in the second light-emitting unit 202 can be prevented to a certain extent. Since electrons in the cathode 500 of the second light-emitting unit 202 are always present, it is only necessary to cut off the lateral transmission path of positively charged holes in the first light-emitting unit 201. The second potential connected to the metal part 300 is an AC signal, with alternating positive and negative potentials. When the second potential is negative, the positively charged holes in the first light-emitting unit 201 can be conducted away by the metal part 300 and will not be transmitted to the second light-emitting unit 202, thereby improving the color crosstalk problem caused by lateral leakage.

[0092] In some alternative embodiments, reference continues to be made to... Figure 12 When the metal part 300 includes a third metal part 3003 that is in the same layer as the first hole transport layer 602, the second hole transport layer 607, and the first p-type charge generation layer 606, the second potential of the third metal part 3003 in the same layer as the first hole transport layer 602 and the second potential of the third metal part 3003 in the same layer as the second hole transport layer 607 are fixed negative potentials, and the second potential of the third metal part 3003 in the same layer as the first p-type charge generation layer 606 is an AC signal.

[0093] Figure 12 In the middle, the metal part 300 includes a third metal part 3003 on the same layer as the first hole transport layer 602, the second hole transport layer 607, and the first p-type charge generation layer 606. That is, the third metal part 3003 is simultaneously disposed on the same layer as the first hole transport layer 602, the second hole transport layer 607, and the first p-type charge generation layer 606. The second potential of the third metal part 3003 on the same layer as the first hole transport layer 602 and the second potential of the third metal part 3003 on the same layer as the second hole transport layer 607 are fixed negative. The potential, for example, can be -3V or the same potential as the cathode 500, which can allow the holes that leak laterally in the first hole transport layer 602 and the holes that leak laterally in the second hole transport layer 607 to be discharged through the third metal part 3003. The second potential of the third metal part 3003, which is in the same layer as the first p-type charge generation layer 606, is an AC signal, for example, an AC signal that alternates between 0V and -3V. At this time, the negative potential in the AC signal can allow the holes that leak laterally in the first p-type charge generation layer 606 to be discharged through the third metal part 3003.

[0094] On the other hand, since the first p-type charge generation layer 606 and the second hole transport layer 607 are stacked, if the metal part 300 is simultaneously connected to a fixed negative potential, a coupling effect will occur between the two third metal parts 3003, affecting the display of the display panel 1000. The second potential of the third metal part 3003 on the same layer as the first p-type charge generation layer 606 is an AC signal, and the second potential of the third metal part 3003 on the same layer as the second hole transport layer 607 is a fixed negative potential. This can reduce the coupling effect between the two third metal parts 3003.

[0095] In some alternative embodiments, reference continues to be made to... Figure 2 and combined Figures 9 to 13 The light-emitting units 200 along the first direction X have different colors, the metal parts 300 are arranged along the first direction X and extend along the second direction Y, and the second direction Y intersects with the first direction X.

[0096] Figure 2 Along the first direction X, any two adjacent light-emitting units 200 have different colors. Therefore, when one of the light-emitting units 200 emits light and generates lateral leakage, the adjacent light-emitting unit 200 will also emit light, resulting in color crosstalk. Thus, the metal part 300 arranged along the first direction X can conduct the positive charge of the leakage, improving the problem of color crosstalk caused by lateral leakage.

[0097] In some alternative embodiments, reference continues to be made to... Figure 8 and combination Figures 9 to 13 The metal part 300 is also arranged along the second direction Y and extends along the first direction X.

[0098] Reference Figure 8 , Figure 8 In this embodiment, the colors of any two adjacent light-emitting units 200 along the first direction X are different, and the colors of any two adjacent light-emitting units 200 along the second direction Y are also different. The metal part 300 provided in this embodiment extends along the first direction X and is arranged in the second direction Y. At the same time, the metal part 300 also extends along the second direction Y and is arranged along the first direction X. Thus, the metal part 300 is provided between any two adjacent light-emitting units 200. Regardless of whether lateral leakage occurs in the first direction X or the second direction Y, the problem of color crosstalk can be improved.

[0099] In some alternative embodiments, reference continues to be made to... Figure 9 Along the first direction X, the distance between the anodes 400 of two adjacent light-emitting units 200 is c, and the width of the metal part 300 along the first direction X is d, where d < c.

[0100] It is understandable that the width of the metal part 300 in the first direction X is such that it cannot cover the anode 400. If the metal part 300 covers the anode 400, that is, the metal part 300 will occupy the space of the first hole injection layer 601 in the light-emitting unit 200, and the light-emitting efficiency of each light-emitting unit 200 will be reduced. Therefore, when the metal part 300 is located on the side of the pixel definition layer 700 away from the substrate 100, the width d of the metal part 300 in the first direction X should be smaller than the distance c between two adjacent anodes 400, so as not to affect the normal light emission of the light-emitting unit 200 in the display panel 1000.

[0101] In some alternative embodiments, reference continues to be made to... Figures 9 to 13 The metal part 300 is made of aluminum, silver, or a magnesium-aluminum alloy. It is understood that aluminum, silver, and magnesium-aluminum alloys are all good conductors of electricity. After connecting the metal part 300 to the second potential, it is easy to conduct electrons away from the metal part 300, which can better improve the color crosstalk caused by lateral leakage current.

[0102] Based on the same inventive concept, the present invention also provides a display panel, see reference. Figure 2 , Figure 14 and Figure 15 , Figure 14 yes Figure 2 Another cross-sectional view along the A-A' direction. Figure 15 yes Figure 2 Another cross-sectional view along line A-A'. The display panel 1000 in this embodiment includes: a substrate 100, a plurality of light-emitting units 200 located on one side of the substrate 100, a pixel definition layer 700 between adjacent light-emitting units 200, and adjacent light-emitting units 200 emitting different colors; each light-emitting unit 200 includes an anode 400, a light-emitting structure located on the side of the anode 400 away from the substrate 100, and a cathode 500 located on the side of the light-emitting structure away from the substrate 100, wherein the light-emitting structure includes a first hole injection layer 601 located on the side of the anode 400 away from the substrate 100, and a cathode 500 located on the side of the first hole injection layer 601 away from the substrate 100. The following layers are defined as follows: a first hole transport layer 602 on the side away from the substrate 100; a first light-emitting material layer 603 on the side of the first hole transport layer 602 away from the substrate 100; a first hole blocking layer 604 on the side of the first light-emitting material layer 603 away from the substrate 100; a first n-type charge generating layer 605 on the side of the first hole blocking layer 604 away from the substrate 100; a first p-type charge generating layer 606 on the side of the first n-type charge generating layer 605 away from the substrate 100; a second hole transport layer 607 on the side of the first p-type charge generating layer 606 away from the substrate 100; and a third hole transport layer 608 on the side of the first n-type charge generating layer 605 away from the substrate 100. The following layers are described: a second light-emitting material layer 608 on the side of the hole transport layer 607 away from the substrate 100; a second hole blocking layer 609 on the side of the second light-emitting material layer 608 away from the substrate 100; a second n-type charge generating layer 610 on the side of the second hole blocking layer 609 away from the substrate 100; a second p-type charge generating layer 611 on the side of the second n-type charge generating layer 610 away from the substrate 100; a third hole transport layer 612 on the side of the second p-type charge generating layer 611 away from the substrate 100; and a third light-emitting material layer 608 on the side of the third hole transport layer 612 away from the substrate 100. The third hole blocking layer 614, located on the side of the third light-emitting material layer 613 away from the substrate 100, and the electron transport layer 616 located on the side of the third hole blocking layer 614 away from the substrate 100, are included in the pixel definition layer 700 on the side away from the substrate 100. The metal portion 300 includes at least a fifth metal portion 3005 on the same layer as the first hole transport layer 602, the first p-type charge generating layer 606, the second hole transport layer 607, the second p-type charge generating layer 611, and / or the third hole transport layer 612. The metal portion 300 is connected to a third potential.

[0103] Specifically, the display panel 1000 in this embodiment is a ternary AMOLED display panel, including a first light-emitting material layer 603, a second light-emitting material layer 608, and a third light-emitting material layer 613, that is, it has three light-emitting material layers, which can improve the light-emitting efficiency.

[0104] The light-emitting structure of the light-emitting panel in this embodiment includes a first hole injection layer 601 located on the side of the anode 400 away from the substrate 100, a first hole transport layer 602 located on the side of the first hole injection layer 601 away from the substrate 100, a first light-emitting material layer 603 located on the side of the first hole transport layer 602 away from the substrate 100, a first hole blocking layer 604 located on the side of the first light-emitting material layer 603 away from the substrate 100, a first n-type charge generation layer 605 (i.e., n CGL, this layer is electron-rich) located on the side of the first hole blocking layer 604 away from the substrate 100, and a first p-type charge generation layer 606 (i.e., p CGL) located on the side of the first n-type charge generation layer 605 away from the substrate 100. CGL (hole-rich layer), a second hole transport layer 607 located on the side of the first p-type charge generation layer 606 away from the substrate 100, a second light-emitting material layer 608 located on the side of the second hole transport layer 607 away from the substrate 100, a second hole blocking layer 609 located on the side of the second light-emitting material layer 608 away from the substrate 100, a second n-type charge generation layer 610 (i.e., n CGL, electron-rich layer), and a second p-type charge generation layer 611 (i.e., p CGL, electron-rich layer) located on the side of the second n-type charge generation layer 610 away from the substrate 100. CGL (the hole-rich layer), a third hole transport layer 612 located on the side of the second p-type charge generation layer 611 away from the substrate 100, a third light-emitting material layer 613 located on the side of the third hole transport layer 612 away from the substrate 100, a third hole blocking layer 614 located on the side of the third light-emitting material layer 613 away from the substrate 100, and an electron transport layer 616 located on the side of the third hole blocking layer 614 away from the substrate 100. Figure 13 and Figure 14 The first hole injection layer 601, first hole transport layer 602, first hole blocking layer 604, first n-type charge generation layer 605, first p-type charge generation layer 606, second hole transport layer 607, second hole blocking layer 609, second n-type charge generation layer 610, second p-type charge generation layer 611, third hole transport layer 612, third hole blocking layer 614, and electron transport layer 616 are not patterned. Figure 13 and Figure 14It is known that there are more film layers between the anode 400 and the cathode 500. At this time, a charge generation layer with extremely strong charge transport capability is needed to connect different light-emitting material layers. Because of its extremely strong charge transport capability, the accompanying lateral leakage current is also very large. The severity of this lateral leakage current is more serious and obvious than that of single-unit devices and dual-unit devices.

[0105] In this invention, a metal portion 300 is included on the side of the pixel definition layer 700 away from the substrate 100. The metal portion 300 includes at least a fifth metal portion 3005 on the same layer as the first hole transport layer 602, the first p-type charge generation layer 606, the second hole transport layer 607, the second p-type charge generation layer 611, and / or the third hole transport layer 612. The metal portion 300 is connected to a third potential. Figure 13 Taking the fifth metal part 3005, which is on the same layer as the third hole transport layer 612, as an example, the metal part 300 is 3005. Figure 15 Taking the metal portion 300 as an example, it is a fifth metal portion 3005 that is in the same layer as the first hole transport layer 602, the first p-type charge generation layer 606, the second hole transport layer 607, the second p-type charge generation layer 611, and the third hole transport layer 612. Of course, the metal portion 300 can be a fifth metal portion 3005 that is in the same layer as any one, two, three, or four of the first hole transport layer 602, the first p-type charge generation layer 606, the second hole transport layer 607, the second p-type charge generation layer 611, and the third hole transport layer 612, which is not shown here.

[0106] Optionally, during fabrication, before depositing the first hole transport layer, a fifth metal portion 3005 is deposited on the position corresponding to the pixel definition layer using a fine metal mask; or before depositing the second hole transport layer 607, a fifth metal portion 3005 is deposited using a fine metal mask; or before depositing the first p-type charge generation layer 606, a fifth metal portion 3005 is deposited on the position corresponding to the pixel definition layer using a fine metal mask; or before depositing the second p-type charge generation layer 611, a fifth metal portion 3005 is deposited on the position corresponding to the pixel definition layer using a fine metal mask; or before depositing the third hole transport layer 612, a fifth metal portion 3005 is deposited on the position corresponding to the pixel definition layer using a fine metal mask.

[0107] It is understandable that when the light-emitting unit 200 emits light, lateral leakage current occurs. Positively charged holes in the first light-emitting unit 201 recombine with negatively charged electrons in the cathode 500 of the second light-emitting unit 202 within the second light-emitting unit 202, forming excitons that excite the light-emitting molecules in the second light-emitting unit 202, causing it to emit light. Therefore, to improve the lighting of the second light-emitting unit 202, it is necessary to cut off the hole transport path. In the ternary AMOLED display panel 1000 of this embodiment, the first hole transport layer 602, the first p-type charge generation layer 606, and the second hole transport layer 607... The second p-type charge generation layer 611 and the third hole transport layer 612 all contain positively charged holes. Therefore, a metal part 300 is provided on the side of the pixel definition layer 700 away from the substrate 100. The metal part 300 is placed on the same layer as any one, two, three, four or five of the first hole transport layer 602, the first p-type charge generation layer 606, the second hole transport layer 607, the second p-type charge generation layer 611 and the third hole transport layer 612. The metal part 300 can conduct the positive charge that leaks laterally, thereby improving the problem of color crosstalk caused by lateral leakage.

[0108] In some alternative embodiments, reference continues to be made to... Figure 15 When the metal portion 300 includes at least a fifth metal portion 3005 on the same layer as the first hole transport layer 602, the first p-type charge generation layer 606, the second hole transport layer 607, the second p-type charge generation layer 611, and the third hole transport layer 612, the third potential of the fifth metal portion 3005 on the same layer as the first hole transport layer 602, the third potential of the fifth metal portion 3005 on the same layer as the second hole transport layer 607, and the third potential of the fifth metal portion 3005 on the same layer as the third hole transport layer 612 are all fixed negative potentials, and the third potential of the fifth metal portion 3005 on the same layer as the first p-type charge generation layer 606 and the fifth metal portion 3005 on the same layer as the second p-type charge generation layer 611 are all AC signals.

[0109] Figure 15In the first hole transport layer 602, the metal portion 300 is a fifth metal portion 3005 on the same layer as the first hole transport layer 602, the first p-type charge generation layer 606, the second hole transport layer 607, the second p-type charge generation layer 611, and the third hole transport layer 612. The third potentials of the fifth metal portion 3005 on the first hole transport layer 602, the fifth metal portion 3005 on the same layer as the second hole transport layer 607, and the fifth metal portion 3005 on the same layer as the third hole transport layer 612 are all fixed negative potentials, for example, -3V or the same potential as the cathode 500. The first hole transport layer 602 can be... Holes leaking into the second hole transport layer 607 and the third hole transport layer 612 are led out through the fifth metal part 3005. The third potential of the fifth metal part 3005, which is on the same layer as the first p-type charge generation layer 606, and the fifth metal part 3005, which is on the same layer as the second p-type charge generation layer 611, are both AC signals, such as alternating AC signals of 0V and -3V. At this time, the negative potential in the AC signal can lead out the holes leaking into the first p-type charge generation layer 606 and the second p-type charge generation layer 611 through the fifth metal part 3005.

[0110] On the other hand, since the first p-type charge generation layer 606 and the second hole transport layer 607 are stacked, if the metal part 300 is simultaneously connected to a fixed negative potential, a coupling effect will occur between the two fifth metal parts 3005, affecting the display of the display panel 1000. However, the third potential of the fifth metal part 3005 in the same layer as the first p-type charge generation layer 606 is an AC signal, and the third potential of the fifth metal part 3005 in the same layer as the second hole transport layer 607 is a fixed negative potential. This can reduce the coupling effect between the two fifth metal parts 3005. Similarly, the second p-type charge generation layer 611 and the third hole transport layer 612 are stacked. If the metal part 300 is simultaneously connected to a fixed negative potential, coupling will occur between the two fifth metal parts 3005, affecting the display of the display panel 1000. The third potential of the fifth metal part 3005 in the same layer as the second p-type charge generation layer 611 is an AC signal, and the third potential of the fifth metal part 3005 in the same layer as the third hole transport layer 612 is a fixed negative potential. This can reduce the coupling between the two fifth metal parts 3005.

[0111] In some alternative embodiments, reference continues to be made to... Figure 2 and reference Figure 14 and Figure 15 The light-emitting units 200 along the first direction X have different colors, the metal parts 300 are arranged along the first direction X and extend along the second direction Y, and the second direction Y intersects with the first direction X.

[0112] Figure 2 Along the first direction X, any two adjacent light-emitting units 200 have different colors. Therefore, when one of the light-emitting units 200 emits light and generates lateral leakage, the adjacent light-emitting unit 200 will also emit light, resulting in color crosstalk. Thus, the metal part 300 arranged along the first direction X can conduct the positive charge of the leakage, improving the problem of color crosstalk caused by lateral leakage.

[0113] In some alternative embodiments, please refer to Figure 16 , Figure 16 This is a schematic diagram of the planar structure of a display device provided in an embodiment of the present invention. The display device 2000 provided in this embodiment includes the display panel 1000 provided in the above embodiment of the present invention. Figure 16 This embodiment uses a mobile phone as an example to illustrate the display device 2000. It is understood that the display device 2000 provided in this embodiment can be any other display device 2000 with display functions, such as a computer, television, or vehicle-mounted display device; this invention does not impose specific limitations on this. The display device 2000 provided in this embodiment has the beneficial effects of the display panel 1000 provided in this embodiment. For details, please refer to the specific descriptions of the display panel 1000 in the above embodiments; these will not be repeated here.

[0114] As can be seen from the above embodiments, the display panel and display device provided by the present invention achieve at least the following beneficial effects:

[0115] The display panel of this invention includes a substrate and a plurality of light-emitting units located on one side of the substrate. A pixel definition layer is included between any two adjacent light-emitting units. The light-emitting colors of adjacent light-emitting units are different. Each light-emitting unit includes an anode, a cathode, and a light-emitting structure located between the anode and cathode. The light-emitting structure includes a first hole injection layer, a first hole transport layer, a first light-emitting material layer, a first hole blocking layer, and an electron transport layer stacked on the anode. The anode provides hole injection, and the cathode provides electron injection. Under the drive of an external voltage, holes and electrons injected by the cathode and anode recombine in the organic light-emitting layer to form electron-hole pairs (i.e., excitons) at bound energy levels. The excitons radiate de-excited and emit photons, producing visible light. Since there are many film layers between the anode and cathode, and the distance between them is relatively large, the voltage of the anode will produce different degrees of voltage drop in each layer. To ensure the light-emitting structure emits light, the voltage of the anode needs to be sufficiently high. When the voltage of the anode is sufficiently high, holes will not only be injected in the direction perpendicular to the substrate, but will also move to adjacent light-emitting units in the lateral direction. Holes are injected in the first hole injection layer. These holes are positively charged. If they leak into adjacent light-emitting units, a voltage difference will be formed with the cathode in the adjacent light-emitting unit, causing the adjacent light-emitting unit to be lit, resulting in color crosstalk. In this invention, a metal part is included on the side of the pixel definition layer away from the substrate. The metal part includes at least a first metal part in the same layer as the first hole injection layer. The metal part is connected to a first potential. When the light-emitting unit lit therein generates lateral leakage, the holes will be discharged through the first metal part to prevent the adjacent light-emitting unit from being lit, thereby improving the problem of color crosstalk in the display panel.

[0116] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display panel, characterized by, The application relates to a display device, comprising: a substrate, a plurality of light-emitting units arranged on one side of the substrate, and a pixel definition layer arranged between adjacent light-emitting units, wherein the light-emitting colors of adjacent light-emitting units are different; each light-emitting unit comprises an anode, a light-emitting structure arranged on the side of the anode away from the substrate, and a cathode arranged on the side of the light-emitting structure away from the substrate, wherein the light-emitting structure comprises a first hole injection layer arranged on the side of the anode away from the substrate, a first hole transport layer arranged on the side of the first hole injection layer away from the substrate, a first light-emitting material layer arranged on the side of the first hole transport layer away from the substrate, a first hole blocking layer arranged on the side of the first light-emitting material layer away from the substrate, a first n-type charge generation layer arranged on the side of the first hole blocking layer away from the substrate, a first p-type charge generation layer arranged on the side of the first n-type charge generation layer away from the substrate, a second hole transport layer arranged on the side of the first p-type charge generation layer away from the substrate, a second light-emitting material layer arranged on the side of the second hole transport layer away from the substrate, a second hole blocking layer arranged on the side of the second light-emitting material layer away from the substrate, and an electron transport layer arranged on the side of the second hole blocking layer away from the substrate, wherein a metal part is arranged on the side of the pixel definition layer away from the substrate, the metal part comprises at least a third metal part which is in the same layer as the first hole transport layer, the second hole transport layer and the first p-type charge generation layer, and the metal part is connected to a second potential. The second potential of the third metal part in the same layer as the first hole transport layer and the second hole transport layer is a fixed negative potential, and the second potential of the third metal part in the same layer as the first p-type charge generation layer is an alternating signal.

2. The display panel of claim 1, wherein, The material of the metal part comprises aluminum, silver or magnesium-aluminum alloy.

3. The display panel of claim 1, wherein, The metal part further comprises a fourth metal part which is in the same layer as the first hole injection layer.

4. The display panel of claim 1, wherein, The metal part is arranged along a first direction and extends along a second direction intersecting the first direction.

5. The display panel of claim 4, wherein, The metal part is further arranged along the second direction and extends along the first direction.

6. The display panel of claim 4, wherein, In the first direction, the distance between the anodes of two adjacent light-emitting units is c, and the width of the metal part in the first direction is d, and d < c.

7. A display panel, characterized in that, The application further relates to a display device, comprising: a substrate a plurality of light-emitting units arranged on one side of the substrate, and a pixel definition layer arranged between adjacent light-emitting units, wherein the light-emitting colors of adjacent light-emitting units are different; The light emitting unit comprises an anode, a light emitting structure on a side of the anode away from the substrate, and a cathode on a side of the light emitting structure away from the substrate, wherein the light emitting structure comprises a first hole injection layer on a side of the anode away from the substrate, a first hole transport layer on a side of the first hole injection layer away from the substrate, a first light emitting material layer on a side of the first hole transport layer away from the substrate, a first hole blocking layer on a side of the first light emitting material layer away from the substrate, a first n-type charge generation layer on a side of the first hole blocking layer away from the substrate, a first p-type charge generation layer on a side of the first n-type charge generation layer away from the substrate, a second hole transport layer on a side of the first p-type charge generation layer away from the substrate, a second light emitting material layer on a side of the second hole transport layer away from the substrate, a second hole blocking layer on a side of the second light emitting material layer away from the substrate, a second n-type charge generation layer on a side of the second hole blocking layer away from the substrate, a second p-type charge generation layer on a side of the second n-type charge generation layer away from the substrate, a third hole transport layer on a side of the second p-type charge generation layer away from the substrate, a third light emitting material layer on a side of the third hole transport layer away from the substrate, a third hole blocking layer on a side of the third light emitting material layer away from the substrate, an electron transport layer on a side of the third hole blocking layer away from the substrate, and a metal portion on a side of the pixel defining layer away from the substrate, the metal portion comprising at least a fifth metal portion co-layered with the first hole transport layer, the first p-type charge generation layer, the second hole transport layer, the second p-type charge generation layer, and the third hole transport layer, the metal portion being connected to a third potential. The third potential of the fifth metal portion co-layered with the first hole transport layer, the third potential of the fifth metal portion co-layered with the second hole transport layer, and the third potential of the fifth metal portion co-layered with the third hole transport layer are all fixed negative potentials, and the third potential of the fifth metal portion co-layered with the first p-type charge generation layer and the third potential of the fifth metal portion co-layered with the second p-type charge generation layer are all alternating signals.

8. The display panel of claim 7, wherein, The colors of the light emitting units in a first direction are different, the metal portions are arranged along the first direction and extend along a second direction intersecting the first direction.

9. A display device, characterized by comprising: The display panel comprises the display panel of any one of claims 1 to 8.

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