Display panel and display device
Patent Information
- Application Number
- CN202522545830.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-11-28
AI Technical Summary
[0003]本实用新型提供了一种显示面板和显示装置，以解决显示面板的蓝光串扰问题
[0025]本实用新型实施例提供的技术方案，通过在相邻两个第三发光层之间的电荷生成层中对应的位置设置导电部，从而降低了蓝色发光层对应区域的电阻，为载流子提供了优先流通路径，有效抑制了载流子在不同颜色发光层间的横向扩散，从而显著减少了蓝光串扰现象，改善了显示面板的色纯度，提升了显示面板的显示效果。
Smart Images
Figure CN224891062U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display panel technology, and in particular to a display panel and a display device. Background Technology
[0002] Currently, in RGB three-color AMOLED (Active-matrix organic light-emitting diode) display devices, due to the high energy of blue light photons and the large energy level difference of the corresponding materials, the efficiency and lifetime of blue light materials are lower than those of red and green light materials. Furthermore, because the driving voltage for blue light is higher than that for red and green light, blue light pixels are more susceptible to leakage current from neighboring pixels, leading to blue light crosstalk in the display device and affecting brightness variations. Utility Model Content
[0003] This invention provides a display panel and a display device to solve the problem of blue light crosstalk in display panels.
[0004] According to one aspect of the present invention, a display panel is provided, comprising: an anode layer, a cathode layer, at least two light-emitting layers and at least one charge-generating layer;
[0005] Multiple light-emitting layers are disposed between the anode layer and the cathode layer, and a charge-generating layer is disposed between two adjacent light-emitting layers;
[0006] The light-emitting layer includes a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer that are spaced apart.
[0007] The charge generation layer includes a first charge generation layer, an intermediate layer, and a second charge generation layer stacked together; the portion of the intermediate layer corresponding to the third light-emitting layer includes a conductive portion; the portions of the first charge generation layer and the second charge generation layer corresponding to the first light-emitting layer and the second light-emitting layer are in contact with each other.
[0008] The first light-emitting layer is red, the second light-emitting layer is green, and the third light-emitting layer is blue.
[0009] Optionally, the display panel further includes a substrate, the anode layer is disposed on one side of the substrate, and the orthographic projection of the conductive portion on the substrate is located within the orthographic projection of the third light-emitting layer on the substrate.
[0010] Optionally, the conductive part includes a plurality of spaced-apart conductive units; the conductive units are made of silver.
[0011] Optionally, the thickness of the conductive portion is 0.3 nm to 0.7 nm.
[0012] Optionally, the resistance of the conductive portion is less than the resistance of the contact portion between the first charge generation layer and the second charge generation layer.
[0013] Optionally, the first charge generation layer is located near the anode layer, and the second charge generation layer is located near the cathode layer; the first charge generation layer is an N-type charge generation layer, and the second charge generation layer is a P-type charge generation layer.
[0014] Optionally, the display panel further includes a substrate, a hole injection layer, an electron injection layer, at least one hole transport layer, and at least one electron transport layer;
[0015] The anode layer is disposed on one side of the substrate;
[0016] The hole injection layer is disposed between the anode layer and the light-emitting layer adjacent to the anode layer;
[0017] Each of the hole transport layers is disposed on the side of each light-emitting layer near the substrate;
[0018] Each of the electron transport layers is disposed on the side of each light-emitting layer away from the substrate;
[0019] The electron injection layer is disposed between the cathode layer and the light-emitting layer adjacent to the cathode layer.
[0020] Optionally, the display panel further includes: at least one hole blocking layer and an electron blocking layer;
[0021] Each of the hole blocking layers is disposed between each of the light-emitting layers and each of the electron transport layers; each of the electron blocking layers is disposed between each of the light-emitting layers and each of the hole transport layers.
[0022] Optionally, the anode layer includes a plurality of anodes spaced apart; the plurality of anodes correspond to the first light-emitting layer, the second light-emitting layer and the third light-emitting layer respectively;
[0023] The projections of the multiple anodes on the substrate cover the projections of the first light-emitting layer on the substrate, the second light-emitting layer on the substrate, and the third light-emitting layer on the substrate.
[0024] According to a second aspect of the present invention, a display device is also provided, comprising the display panel described in any one of the first aspects.
[0025] The technical solution provided by this utility model embodiment reduces the resistance of the corresponding area of the blue light-emitting layer by setting a conductive part at the corresponding position in the charge generation layer between two adjacent third light-emitting layers, thereby providing a preferential flow path for charge carriers, effectively suppressing the lateral diffusion of charge carriers between different color light-emitting layers, significantly reducing blue light crosstalk, improving the color purity of the display panel, and enhancing the display effect of the display panel.
[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of this utility model;
[0029] Figure 2 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present utility model;
[0030] Figure 3 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present utility model;
[0031] Figure 4 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present utility model. Detailed Implementation
[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0034] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present utility model. See also... Figure 1 The display panel includes: an anode layer 10, a cathode layer 20, at least two light-emitting layers 100, and at least one charge-generating layer 200; multiple light-emitting layers 100 are disposed between the anode layer 10 and the cathode layer 20, and a charge-generating layer 200 is disposed between two adjacent light-emitting layers 100; each light-emitting layer 100 includes a first light-emitting layer 110, a second light-emitting layer 120, and a third light-emitting layer 130 disposed at intervals; the charge-generating layer 200 includes a first charge-generating layer 210, an intermediate layer 220, and a second charge-generating layer 230 disposed in layers; the portion of the intermediate layer 220 corresponding to the third light-emitting layer 130 includes a conductive portion 221; the portions of the first charge-generating layer 210 and the second charge-generating layer 230 corresponding to the first light-emitting layer 110 and the second light-emitting layer 120 are in contact; the first light-emitting layer 110 is red, the second light-emitting layer 120 is green, and the third light-emitting layer 130 is blue.
[0035] Specifically, the light-emitting layer 100 of the display panel is disposed between the anode layer 10 and the cathode layer 20. The anode layer 10 and the cathode layer 20 can be used as two electrodes on either side of the light-emitting layer 100. An external electric field is applied to the anode layer 10 and the cathode layer 20, causing the light-emitting layer 100 to emit light under the influence of the electric field. For example, as... Figure 1As shown, the display panel provided in this embodiment of the present invention includes two light-emitting layers 100 and one charge-generating layer 200, with the two light-emitting layers 100 connected in series via the charge-generating layer 200. In other embodiments, multiple light-emitting layers 100 and multiple charge-generating layers can be provided, with adjacent light-emitting layers 100 connected in series via a charge-generating layer 200. It can be understood that the number of charge-generating layers 200 is one less than the number of light-emitting layers 100. The light-emitting layers 100 in the same layer are provided with multiple first light-emitting layers 110, multiple second light-emitting layers 120, and multiple third light-emitting layers 130. The first light-emitting layers 110, second light-emitting layers 120, and third light-emitting layers 130 of the same layer can be arranged at intervals using a patterning process. Specifically, the first light-emitting layer 110 can be a red light-emitting layer using a red organic electroluminescent material; the second light-emitting layer 120 can be a green light-emitting layer using a green organic electroluminescent material; and the third light-emitting layer 130 can be a blue light-emitting layer using a blue organic electroluminescent material. In the different light-emitting layers 100, the orthographic projections of light-emitting layers of the same color onto the anode layer 10 coincide. For example... Figure 1As shown, the orthographic projections of two different first light-emitting layers 110 onto the anode layer 10 coincide, the orthographic projections of two different second light-emitting layers 120 onto the anode layer 10 coincide, and the orthographic projections of two different third light-emitting layers 130 onto the anode layer 10 coincide. A charge-generating layer 200 is disposed between two adjacent light-emitting layers 100 for connecting the two adjacent light-emitting layers 100 in series. The charge-generating layer 200 may include a first charge-generating layer 210, an intermediate layer 220, and a second charge-generating layer 230 stacked together. The portions of the first charge-generating layer 210 and the second charge-generating layer 230 corresponding to the first light-emitting layer 110 and the second light-emitting layer 120 can be in direct contact. The portion of the first charge generation layer 210 corresponding to the first light-emitting layer 110 and the second light-emitting layer 120 can be understood as the area on the surface of the first charge generation layer 210 near the second charge generation layer 220, where the first light-emitting layer 110 and the second light-emitting layer 120 are perpendicularly projected along the thickness direction of the display panel. Similarly, the portion of the second charge generation layer 230 corresponding to the first light-emitting layer 110 and the second light-emitting layer 120 can be understood as the area on the surface of the second charge generation layer 220 near the first charge generation layer 210, where the first light-emitting layer 110 and the second light-emitting layer 120 are perpendicularly projected along the thickness direction of the display panel. An intermediate layer 220 may be additionally provided for the portions of the first charge generation layer 210 and the second charge generation layer 230 corresponding to the third light-emitting layer 130. This intermediate layer 220 may contain conductive portions 221 for reducing resistance. The portion of the first charge generation layer 210 corresponding to the third light-emitting layer 130 can be understood as the area where the third light-emitting layer 130 is vertically projected onto the surface of the first charge generation layer 210 near the second charge generation layer 220; similarly, the portion of the second charge generation layer 230 corresponding to the third light-emitting layer 130 can be understood as the area where the third light-emitting layer 130 is vertically projected onto the surface of the second charge generation layer 230 near the first charge generation layer 210. That is, in the blue light-emitting layer region where the third light-emitting layer 130 is located, due to the presence of the conductive portion 221, a low-resistance channel, as indicated by the arrow, can be constructed between multiple third light-emitting layers 130. This prevents blue light crosstalk from the third light-emitting layer 130 to the adjacent first light-emitting layer 110 and second light-emitting layer 120 when emitting blue light, effectively solving the problem of unbalanced three-color light emission caused by differences in material properties and improving the display effect of the display panel.
[0036] The technical solution provided by this utility model embodiment reduces the resistance of the corresponding area of the blue light-emitting layer by setting a conductive part at the corresponding position in the charge generation layer between two adjacent third light-emitting layers, thereby providing a preferential flow path for charge carriers, effectively suppressing the lateral diffusion of charge carriers between different color light-emitting layers, significantly reducing blue light crosstalk, improving the color purity of the display panel, and enhancing the display effect of the display panel.
[0037] Optionally, Figure 2 This is a schematic diagram of another display panel provided in an embodiment of the present utility model. Based on the above embodiments, see... Figure 2 The display panel also includes a substrate 30, an anode layer 10 is disposed on one side of the substrate 30, and the orthogonal projection of the conductive part 221 on the substrate 30 is located within the orthogonal projection of the third light-emitting layer 130 on the substrate 30.
[0038] Specifically, the substrate 30 can serve as a support base for the display panel, and the substrate 30 can be made of glass or a flexible polymer material. The conductive portion 221 can be deposited on the corresponding position of the third light-emitting layer 130 through a mask patterning process, ensuring that the conductive portion 221 completely covers the third light-emitting layer 130. This alignment design utilizes the low resistance characteristics of the conductive portion 221 to form a low-resistance conductive path between different layers of the third light-emitting layer 130 in a direction perpendicular to the substrate 30, preventing the carriers of the third light-emitting layer 130 from diffusing to other light-emitting layers and avoiding interference with the red and green light-emitting areas.
[0039] Optionally, based on the above embodiments, see below. Figure 2 The conductive part 221 includes a plurality of spaced conductive units 2221; the conductive units 2221 are made of silver.
[0040] Specifically, the conductive portion 221 can be composed of multiple spaced conductive units 2211. These multiple conductive units 2211 can be discretely distributed to form a thin film with multiple gaps. This arrangement not only creates low-resistance conductive paths between the multiple third light-emitting layers 130, but also ensures that the formed conductive portion 221 has a certain degree of light transmittance, preventing excessive density of conductive units 2211 from affecting the light emission effect of the display panel. The conductive units 2211 can be metallic silver. The bulk conductivity of metallic silver is approximately 6.3 × 10⁻⁶. 7 S / m has good conductivity and stability, and the conductive part 221 can be formed by thermal evaporation or sputtering process to significantly improve the blue light crosstalk problem of display panel.
[0041] Alternatively, based on the above embodiments, see [link to relevant documentation]. Figure 2 The thickness of the conductive part 221 is 0.3nm-0.7nm.
[0042] Specifically, when the thickness of the conductive portion 221 is less than 0.3 nm, a continuous conductive path cannot be formed between the multiple third light-emitting layers 130, and the resistance reduction effect is not significant. When the thickness is greater than 0.7 nm, it will affect the carrier exchange between the multiple third light-emitting layers 130 in the direction perpendicular to the substrate 30, and may also reduce light transmittance. Setting the thickness of the conductive portion 221 to 0.3 nm-0.7 nm can ensure that the conductive portion 221 is semi-transparent, which does not affect the luminous efficiency of the display panel, while providing sufficient conductivity to ensure that the conductive portion 221 does not completely block the carrier exchange between the multiple third light-emitting layers 130 in the direction perpendicular to the substrate 30, thus ensuring the normal operation of the series structure of the display panel.
[0043] Alternatively, based on the above embodiments, see [link to relevant documentation]. Figure 2 The resistance of the conductive part 221 is less than the resistance of the contact portion between the first charge generation layer 210 and the second charge generation layer 230.
[0044] Specifically, the portions of the first light-emitting layer 110 and the second light-emitting layer 120 corresponding to the first charge-generating layers 210 and 230 do not have conductive portions 221. This can be understood as the portions of the red and green light-emitting layers corresponding to the charge-generating layers 200 being in direct contact with the first charge-generating layers 210 and 230. Therefore, the lateral resistance of the portions of the first light-emitting layer 110 and the second light-emitting layer 120 corresponding to the first charge-generating layers 210 and 230 is relatively high. When charge exchange occurs in a direction perpendicular to the substrate 30, a lateral potential difference is formed on both sides of the conductive portion 221 of the third light-emitting layer 130, effectively blocking the lateral current path of charge carriers flowing to the adjacent light-emitting layer, thereby effectively avoiding blue light crosstalk problems.
[0045] Alternatively, based on the above embodiments, see [link to relevant documentation]. Figure 2 The first charge generation layer 210 is close to the anode layer 10, and the second charge generation layer 230 is close to the cathode layer 20; the first charge generation layer 210 is an N-type charge generation layer, and the second charge generation layer 230 is a P-type charge generation layer.
[0046] Specifically, the first charge generation layer 210 can be disposed on the side near the anode layer 10, thus serving as an N-type charge generation layer. The N-type charge generation layer 210 is typically composed of n-type doped organic semiconductor material and is responsible for transporting and injecting negatively charged carrier electrons into the light-emitting layer 100. The second charge generation layer 230 can be disposed on the side near the cathode layer 20, thus serving as a P-type charge generation layer. The P-type charge generation layer 230 is typically composed of p-type doped organic semiconductor material and transports and injects positively charged carrier holes into the light-emitting layer 100. Under the action of an applied electric field, a highly efficient charge separation region is formed at the interface between the N-type and P-type charge generation layers. The generated electrons are injected into the light-emitting layer near the cathode layer 20, and the holes are injected into the light-emitting layer near the anode layer 10, achieving series driving of multiple light-emitting layers.
[0047] Optionally, Figure 3 This is a schematic diagram of another display panel provided in an embodiment of the present utility model. Based on the above embodiments, see... Figure 3 The display panel further includes a hole injection layer 300, an electron injection layer 400, at least one hole transport layer 310, and at least one electron transport layer 410; the anode layer 10 is disposed on one side of the substrate 30; the hole injection layer 300 is disposed between the anode layer 10 and the light-emitting layer 100 adjacent to the anode layer 10; each hole transport layer 310 is disposed on the side of each light-emitting layer 100 close to the substrate 30; each electron transport layer 410 is disposed on the side of each light-emitting layer 100 away from the substrate 30; and the electron injection layer 400 is disposed between the cathode layer 20 and the light-emitting layer 100 adjacent to the cathode layer 20.
[0048] Specifically, the hole injection layer 300 can be disposed between the anode layer 10 and the adjacent light-emitting layer 100 of the anode layer 10, which can reduce the hole injection barrier from the anode 10 to the light-emitting layer 100 and improve the hole injection efficiency. The electron injection layer 400 can be disposed between the cathode layer 20 and the adjacent light-emitting layer 100 of the cathode layer 20, which can reduce the electron injection barrier from the cathode 20 to the light-emitting layer 100 and improve the electron injection efficiency. Each hole transport layer 310 and each electron transport layer 410 are a pair, corresponding to one light-emitting layer 100. Each hole transport layer 310 can be attached to the side of each corresponding light-emitting layer 100 closest to the anode 10, which can improve the hole transport efficiency between the anode 10 and the light-emitting layer 100. The electron transport layer 410 can be attached to the side of each corresponding light-emitting layer 100 closest to the cathode 20, which can improve the electron transport efficiency between the cathode 20 and the light-emitting layer 100.
[0049] Optionally, Figure 4This is a schematic diagram of another display panel provided in an embodiment of the present utility model. Based on the above embodiments, see... Figure 4 The display panel further includes: at least one hole blocking layer 320 and an electron blocking layer 420; each hole blocking layer 320 is disposed between each light-emitting layer 100 and each electron transport layer 410; each electron blocking layer 420 is disposed between each light-emitting layer 100 and each hole transport layer 310.
[0050] Specifically, each hole blocking layer 320 and each electron blocking layer 420 form a pair, corresponding to one light-emitting layer 100. Each hole blocking layer 320 can be tightly attached between its corresponding light-emitting layer 100 and the electron transport layer 410 corresponding to the light-emitting layer 100, and each electron blocking layer 420 can be tightly attached between its corresponding light-emitting layer 100 and the hole transport layer 310 corresponding to the light-emitting layer 100. The hole blocking layer 320 and the electron blocking layer 420 prevent carrier leakage. Specifically, the hole blocking layer 320 forms an energy barrier to prevent holes from flowing to the cathode 20, confining holes within the light-emitting layer 100; the electron blocking layer 420 forms an energy barrier to prevent electrons from flowing to the anode 10, confining electrons within the light-emitting layer 100.
[0051] Optionally, based on the above embodiments, see below. Figure 4 The anode layer 10 includes a plurality of anodes 11 spaced apart; the plurality of anodes 11 correspond to the first light-emitting layer 110, the second light-emitting layer 120 and the third light-emitting layer 130 respectively; the projection of the plurality of anodes 11 on the substrate 30 covers the projection of the first light-emitting layer 110 on the substrate, covers the projection of the second light-emitting layer 120 on the substrate 30, and covers the projection of the third light-emitting layer 130 on the substrate 10.
[0052] Specifically, the anode layer 10 contains a plurality of anodes 11, which are spaced apart and correspond to the first light-emitting layer 110, the second light-emitting layer 120, and the third light-emitting layer 130, respectively. This can be understood as follows: in the direction perpendicular to the substrate 10, each anode 11 can control the first light-emitting layer 110, the second light-emitting layer 120, and the third light-emitting layer 130 connected in series. By adjusting the voltage applied to each anode 11, the first light-emitting layer 110, the second light-emitting layer 120, and the third light-emitting layer 130 corresponding to different anodes 11 emit light of different colors to display different images.
[0053] This utility model embodiment also provides a display device, including the display panel provided in any of the above embodiments of this utility model, which has the same beneficial effects as the above embodiments, and will not be described again here.
[0054] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.
[0055] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A display panel, characterized in that, include: An anode layer, a cathode layer, at least two light-emitting layers, and at least one charge-generating layer; Multiple light-emitting layers are disposed between the anode layer and the cathode layer, and a charge-generating layer is disposed between two adjacent light-emitting layers; The light-emitting layer includes a first light-emitting layer, a second light-emitting layer, and a third light-emitting layer that are spaced apart. The charge generation layer includes a first charge generation layer, an intermediate layer, and a second charge generation layer stacked together; the portion of the intermediate layer corresponding to the third light-emitting layer includes a conductive portion; the portions of the first charge generation layer and the second charge generation layer corresponding to the first light-emitting layer and the second light-emitting layer are in contact with each other. The first light-emitting layer is red, the second light-emitting layer is green, and the third light-emitting layer is blue.
2. The display panel according to claim 1, characterized in that, It also includes a substrate, the anode layer is disposed on one side of the substrate, and the orthogonal projection of the conductive part on the substrate is located within the orthogonal projection of the third light-emitting layer on the substrate.
3. The display panel according to claim 2, characterized in that, The conductive part includes a plurality of spaced-apart conductive units; the conductive units are made of silver.
4. The display panel according to claim 2, characterized in that, The thickness of the conductive part is 0.3nm-0.7nm.
5. The display panel according to claim 2, characterized in that, The resistance of the conductive part is less than the resistance of the contact portion between the first charge generation layer and the second charge generation layer.
6. The display panel according to claim 2, characterized in that, The first charge generation layer is close to the anode layer, and the second charge generation layer is close to the cathode layer; the first charge generation layer is an N-type charge generation layer, and the second charge generation layer is a P-type charge generation layer.
7. The display panel according to claim 6, characterized in that, It also includes a hole injection layer, an electron injection layer, at least one hole transport layer, and at least one electron transport layer; The anode layer is disposed on one side of the substrate; The hole injection layer is disposed between the anode layer and the light-emitting layer adjacent to the anode layer; Each of the hole transport layers is disposed on the side of each light-emitting layer near the substrate; Each of the electron transport layers is disposed on the side of each light-emitting layer away from the substrate; The electron injection layer is disposed between the cathode layer and the light-emitting layer adjacent to the cathode layer.
8. The display panel according to claim 7, characterized in that, Also includes: At least one hole blocking layer and one electron blocking layer; Each of the hole blocking layers is disposed between each of the light-emitting layers and each of the electron transport layers; Each of the electron blocking layers is disposed between each of the light-emitting layers and each of the hole transport layers.
9. The display panel according to claim 6, characterized in that, The anode layer includes a plurality of anodes spaced apart; the plurality of anodes correspond to the first light-emitting layer, the second light-emitting layer and the third light-emitting layer respectively; The projections of the multiple anodes on the substrate cover the projections of the first light-emitting layer on the substrate, the second light-emitting layer on the substrate, and the third light-emitting layer on the substrate.
10. A display device, characterized in that, Includes the display panel described in any one of claims 1-9.