CN112993182A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN112993182A CN112993182A CN202110163076.6A CN202110163076A CN112993182A CN 112993182 A CN112993182 A CN 112993182A CN 202110163076 A CN202110163076 A CN 202110163076A CN 112993182 A CN112993182 A CN 112993182A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/824—Cathodes combined with auxiliary electrodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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Abstract
The invention discloses a display panel and a display device, comprising: a plurality of pixels, each of the pixels including at least one light-emitting region and a non-light-emitting region surrounding the at least one light-emitting region, each of the pixels further including a cathode layer, and the cathode layer including a portion in the at least one light-emitting region; and at least one auxiliary electrode connected in parallel with the cathode layer, wherein the at least one auxiliary electrode is located in the non-light emitting region; compared with the prior art, the invention reduces the surface resistance of the cathode layer, avoids the generation of voltage drop phenomenon, improves the aperture opening ratio and the display uniformity of the display panel and improves the display effect.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device having the same.
Background
Organic Light-Emitting Diode (OLED) Display panels have Display characteristics and quality superior to those of Liquid Crystal Displays (LCDs), for example: the advantages of lightness, thinness, short response time, low driving voltage, better display color, better display visual angle and the like are widely concerned, and the development of the display device is more and more advanced in recent years, so that the display device not only can be used for manufacturing curved surface display, but also gradually develops towards large size.
At present, a large-size top emission device requires a high transmittance of a cathode layer, which limits the cathode layer not to be too thick, and also causes a high resistance of the cathode layer, and after a panel is lighted, due to the resistance of the cathode layer, the brightness of the center of the panel is lower than that of the edge of the panel due to IR-Drop (voltage Drop caused by current flowing through the cathode), which affects the brightness uniformity of the panel.
Disclosure of Invention
Embodiments of the present invention provide a display panel and a display device, which can solve the technical problem in the prior art that a cathode layer of the display panel is thin and has a large resistance, so that a voltage drop is generated, and the display of the display panel is not uniform.
To solve the above technical problem, an embodiment of the present invention provides a display panel, which includes:
a plurality of pixels, each of the pixels including at least one light-emitting region and a non-light-emitting region surrounding the at least one light-emitting region, each of the pixels further including a cathode layer, and the cathode layer including a portion in the at least one light-emitting region; and
and the at least one auxiliary electrode is connected with the cathode layer in parallel, wherein the at least one auxiliary electrode is positioned in the non-luminous area.
In an embodiment of the invention, the display panel further includes a retaining wall structure defining at least one light emitting region and located in the non-light emitting region, and a first package layer disposed on the retaining wall structure, and the cathode layer is located between the retaining wall structure and the first package layer, wherein at least one of the auxiliary electrodes is disposed on the first package layer and is overlapped with the cathode layer through a via hole.
In an embodiment of the invention, a shortest distance between the auxiliary electrode and the light emitting region is greater than three times a first distance, and the first distance is equal to a sum of a thickness of the retaining wall structure, a thickness of the cathode layer, and a thickness of the first encapsulation layer correspondingly located on the retaining wall structure.
In an embodiment of the invention, a groove is formed on a side of the first encapsulation layer facing the auxiliary electrode, and the auxiliary electrode is disposed in the groove.
In one embodiment of the invention, the thickness of the auxiliary electrode is equal to the depth of the groove.
In an embodiment of the invention, the display panel further includes an antireflection layer disposed on an upper surface of the auxiliary electrode, and a front projection of the antireflection layer on the auxiliary electrode covers the auxiliary electrode.
In one embodiment of the present invention, the anti-reflective layer comprises a black matrix layer.
In an embodiment of the invention, each of the auxiliary electrodes corresponds to one or more of the light emitting areas.
In an embodiment of the invention, the display panel includes a plurality of the auxiliary electrodes, and the plurality of the auxiliary electrodes are uniformly distributed in a display area of the display panel.
According to the above object of the present invention, there is provided a display device including the display panel.
The invention has the beneficial effects that: compared with the prior art, the auxiliary electrode is arranged in the non-luminous area and connected with the cathode layer in parallel, so that the resistance of the cathode layer can be reduced, the voltage drop phenomenon is avoided, the display uniformity of the display panel is improved, the auxiliary electrode is arranged in the non-luminous area and is arranged away from the luminous area, the light emission of the display panel is not affected, the aperture opening ratio of the display panel is improved, and the display effect is improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1A is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 1B is a schematic view of a local plane distribution structure of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic plan view illustrating a planar distribution structure of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic plane distribution structure diagram of another display panel according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The embodiment of the invention aims at solving the technical problem that the display panel has uneven display due to voltage drop caused by the fact that the cathode layer of the display panel is thin and the resistance is large in the conventional display panel and display device.
To solve the above technical problems, an embodiment of the present invention provides a display panel, please refer to fig. 1A and 1B, wherein fig. 1A is a schematic cross-sectional structure along AA' of fig. 1B.
The display panel comprises a plurality of pixels, each pixel comprises at least one light-emitting area 12 and a non-light-emitting area 13 surrounding at least one light-emitting area 12, each pixel further comprises a cathode layer 20, and the cathode layer 20 comprises a part positioned in at least one light-emitting area 12; and at least one auxiliary electrode 40 connected in parallel with the cathode layer 20, wherein the at least one auxiliary electrode 40 is located in the non-light-emitting region 13.
In the implementation and application process, in the existing top emission OLED display panel, the cathode layer is required to have a high transmittance, so that the cathode layer is made to be thin, and further, the resistance of the cathode layer is large. With reference to fig. 1A and fig. 1B, in the OLED display panel provided in the embodiment of the present invention, the auxiliary electrode 40 is disposed in the non-light-emitting region 13, and the auxiliary electrode 40 is connected in parallel with the cathode layer 20, so that the resistance of the cathode layer 20 can be reduced, the voltage drop phenomenon is avoided, the display uniformity of the display panel is improved, and the auxiliary electrode 40 is disposed in the non-light-emitting region 13 and is arranged away from the light-emitting region 12, so that the light emission of the display panel is not affected, the aperture ratio of the display panel is improved, and the display effect is improved.
Further, with reference to fig. 1A and fig. 1B, the display panel includes a substrate 50, a thin film transistor array layer 60 disposed on the substrate 50, an anode 71 and a light emitting layer 72 disposed on the thin film transistor array layer 60, a pixel definition layer 10 disposed on the thin film transistor array layer 60, a cathode layer 20 disposed on the pixel definition layer 10, a first encapsulation layer 31 disposed on the cathode layer 20, a second encapsulation layer 32 disposed on the first encapsulation layer 31, an encapsulation adhesive layer 33 disposed on the second encapsulation layer 32, and a cover plate 80 disposed on the encapsulation adhesive layer 33, and the display panel further includes an auxiliary electrode 40 disposed on the first encapsulation layer 31 and covered by the second encapsulation layer 32, wherein the auxiliary electrode 40 is connected in parallel with the cathode layer 20, that is, the auxiliary electrode 40 is connected to the cathode layer 20 through a via hole, further, the surface resistance of the cathode layer 20 can be reduced, the voltage drop phenomenon can be avoided, and the display uniformity of the display panel can be improved.
Specifically, the substrate 50 includes, but is not limited to, a glass rigid substrate or a flexible substrate.
The thin film transistor array layer 60 includes thin film transistor devices distributed in an array, the thin film transistor devices include an active layer, a gate electrode, a source electrode, a drain electrode, a signal line, and an insulating layer and a passivation layer disposed between the thin film transistor devices, the anode 71 is disposed on the thin film transistor array layer 60 and electrically connected to the thin film transistor devices, and the above structures can be prepared by referring to a conventional process, which is not described herein again.
The pixel definition layer 10 is disposed on the thin film transistor array layer 60 and disposed on the anode 71, the pixel definition layer 10 includes a retaining wall structure 11 defining the light emitting areas 12, and the retaining wall structure 11 is located in the non-light emitting area 13, wherein each light emitting area 12 correspondingly exposes one of the upper surface of the anode 71, the light emitting layer 72 correspondingly disposed in the light emitting area 12 and correspondingly disposed on the upper surface of the anode 71, the cathode layer 20 disposed on the pixel definition layer 10 and continuously covering the retaining wall structure 11 and the light emitting areas 12, and the cathode layer 20 is overlapped with the light emitting layer 72.
The light emitting layer 72 may sequentially include a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer along a direction from the anode 71 to the cathode layer 20, and cooperate with the anode 71 and the cathode layer 20 to complete the transport of electrons and holes, and form an electron-hole pair in the organic light emitting layer to complete light emission.
The material of the light emitting layer 72 includes an organic material, an inorganic material, or a material doped with an organic and inorganic phase, and the manufacturing method of the light emitting layer 72 includes evaporation, inkjet printing, or a combination of inkjet printing and evaporation, which is not limited herein.
The material of the cathode layer 20 includes Ag, MgAg alloy, Al, IZO or IZO/Ag, and the thickness range of the cathode layer 20 includes 5nm to 50 nm.
The first encapsulation layer 31 covers the cathode layer 20, and the material of the first encapsulation layer 31 includes a single inorganic film layer or a stack of multiple layers of any one of SiO, SiN, and SiON, the film thickness of which ranges from 500nm to 2000 nm.
The auxiliary electrode 40 is disposed on the first encapsulation layer 31 and is connected to the cathode layer 20 through a via hole, and the auxiliary electrode 40 is further electrically connected to a signal transmission element electrically connected to the cathode layer 20, so as to implement that the auxiliary electrode 40 is connected to the cathode layer 20 in parallel, wherein an orthographic projection of the auxiliary electrode 40 on the pixel definition layer 10 is located within a coverage range of the retaining wall structure 11, further, a shortest distance L0 between the auxiliary electrode 40 and the light emitting region 12 is greater than three times a first distance L1, and the first distance L1 is equal to a sum of a thickness of the retaining wall structure 11, a thickness of the cathode layer 20, and a thickness of the first encapsulation layer 31 correspondingly located on the retaining wall structure 11, so that the auxiliary electrode 40 has a sufficient distance from the light emitting region 12 to ensure that normal light emission of the light emitting layer 72 is not affected, and large viewing angle visibility of the display panel.
The auxiliary electrode 40 may be formed on the first encapsulation layer 31 by a sputtering film forming method, and then patterned to obtain the auxiliary electrode 40, where the patterning process is not limited to wet etching or dry etching, and in the embodiment of the invention, the auxiliary electrode 40 is disposed on the first encapsulation layer 31 and is overlapped with the cathode layer 20 to reduce the area resistance of the cathode layer 20, avoid the voltage drop phenomenon, and improve the display uniformity of the display panel.
Further, the auxiliary electrode 40 is overlapped with the cathode layer 20 through a via hole, wherein the via hole penetrates through the first package layer 31, and an orthographic projection of the via hole on the auxiliary electrode 40 is located at a central position of the auxiliary electrode 40, so that the via hole is far away from the light emitting region 12, the size of the via hole is 1-5 μm × 1-5 μm, and the via hole can be prepared by dry etching.
In addition, the display panel further includes a second encapsulation layer 32, an encapsulation adhesive layer 33 and a cover plate 80, which are disposed on the first encapsulation layer 31, and the second encapsulation layer 32 covers the auxiliary electrode 40 to protect the auxiliary electrode 40, in the embodiment of the present invention, the auxiliary electrode 40 is disposed on the first encapsulation layer 31, and the first encapsulation layer 31 is adjacent to the cathode layer 20, that is, the auxiliary electrode 40 is closer to the cathode layer 20, so that on one hand, the connection path of the auxiliary electrode can be shortened, and the resistance can be reduced, and on the other hand, the influence on the light emitting from the upper side of the light emitting region 12 due to the fact that the auxiliary electrode 40 is farther from the cathode layer 20 can be avoided, so that the viewing angle range of the display panel is influenced, and the yield and the display effect of the display panel are improved.
In an embodiment of the invention, referring to fig. 2, a groove is disposed on one side of the first package layer 31 where the auxiliary electrode 40 is disposed, and the auxiliary electrode 40 is disposed in the groove, wherein a thickness of the auxiliary electrode 40 is equal to a depth of the groove to avoid generation of a film step difference, in a manufacturing process, a dry etching or a wet etching may be performed on a region where the auxiliary electrode 40 needs to be disposed, and the region may be appropriately thinned to form the groove, and the depth of the groove may be greater than or equal to 50 nm.
It should be noted that the thickness of the auxiliary electrode 40 may also be smaller than the depth of the groove, and the second encapsulation layer 32 is filled in the groove to form a flush surface on a side of the second encapsulation layer 32 facing away from the first encapsulation layer 31.
In this embodiment, the groove is formed in the first packaging layer 31, and the auxiliary electrode 40 is correspondingly disposed in the groove, so that the generation of film segment difference is avoided, and the packaging effect of the second packaging layer 32 and the packaging adhesive layer 33 is improved.
In another embodiment of the present invention, referring to fig. 3, the display panel further includes an antireflection layer 90 disposed on a side of the auxiliary electrode 40 opposite to the first encapsulation layer 31, and an orthogonal projection of the antireflection layer 90 on the auxiliary electrode 40 covers the auxiliary electrode 40 to cover the auxiliary electrode 40, where the antireflection layer 90 includes a black matrix layer, which can prevent the auxiliary electrode 40 from reflecting ambient light, so as to further affect the display effect of the display panel.
In another embodiment of the present invention, referring to fig. 4, a groove is disposed on one side of the first encapsulation layer 31 where the auxiliary electrode 40 is disposed, the auxiliary electrode 40 is disposed in the groove, the display panel further includes an anti-reflection layer 90 disposed on one side of the auxiliary electrode 40 opposite to the first encapsulation layer 31, a front projection of the anti-reflection layer 90 on the auxiliary electrode 40 covers the auxiliary electrode 40 to cover the auxiliary electrode 40, the anti-reflection layer 90 includes a black matrix layer, which can prevent the auxiliary electrode 40 from reflecting ambient light, thereby affecting a display effect of the display panel, and meanwhile, since the auxiliary electrode 40 is disposed in the groove, a film layer section difference between the first encapsulation layer 31 and the second encapsulation layer 32 can be reduced, thereby improving an encapsulation effect, the quality and the display effect of the display panel are improved.
It should be noted that the depth of the groove may be increased, so that the auxiliary electrode 40 and the antireflection layer 90 are both disposed in the groove, and the film step is further reduced.
Further, the display panel includes a plurality of pixels, and each of the pixels includes at least one sub-pixel, each of the sub-pixels corresponds to one of the light emitting regions 12, and the sub-pixels include any one or more of a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, which is not limited herein.
It should be noted that, in the embodiment of the present invention, the display panel includes a plurality of light emitting areas 12, each auxiliary electrode 40 corresponds to one or more of the plurality of light emitting areas 12, that is, each light emitting area 12 may be correspondingly provided with one auxiliary electrode 40, or two light emitting areas 12 are correspondingly provided with one auxiliary electrode 40, or three light emitting areas 12 are correspondingly provided with one auxiliary electrode 40 (as shown in fig. 1B), or each pixel is correspondingly provided with one auxiliary electrode 40, or a plurality of pixels are correspondingly provided with one auxiliary electrode 40, which is not limited herein.
It should be noted that the distribution of the auxiliary electrodes 40 in the display panel may be uniform or non-uniform, for example, the auxiliary electrodes 40 are uniformly distributed in the display area of the display panel (as shown in fig. 5), the distribution density of the auxiliary electrodes 40 increases from the edge of the display panel to the center of the display area of the display panel (as shown in fig. 6), and the specific distribution may be adjusted according to actual situations, which is not limited herein.
In summary, in the display panel provided in the embodiment of the present invention, the auxiliary electrode 40 is disposed above the barrier structure 11, and the auxiliary electrode 40 is connected in parallel with the cathode layer 20, so as to reduce the resistance of the cathode layer 20, avoid the occurrence of a voltage drop phenomenon, and improve the display uniformity of the display panel, and the auxiliary electrode 40 is disposed on the barrier structure 31, and disposed away from the light emitting region 12, so as not to affect the light emission of the display panel, improve the aperture ratio of the display panel, and improve the display effect, meanwhile, the embodiment of the present invention may further dispose the groove on the first encapsulation layer 31, and correspondingly dispose the auxiliary electrode 40 in the groove, so as to reduce the occurrence of a film segment difference, and further improve the encapsulation effect, and in addition, the embodiment of the present invention further disposes the anti-reflection layer 90 on the upper surface of the auxiliary electrode 40, furthermore, the auxiliary electrode 40 can be prevented from reflecting external ambient light, and the display effect of the display panel is improved.
The embodiment of the invention also provides a display device, and the display device comprises the display panel in the embodiment.
The display device comprises wearable equipment such as a smart bracelet, a smart watch, VR (Virtual Reality) and the like; and flexible OLED display and lighting devices such as mobile phones, electronic books and newspapers, televisions, personal portable computers, foldable and rollable OLEDs.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The display panel and the display device provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in the present document by applying specific examples, and the description of the above embodiments is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A display panel, comprising:
a plurality of pixels, each of the pixels including at least one light-emitting region and a non-light-emitting region surrounding the at least one light-emitting region, each of the pixels further including a cathode layer, and the cathode layer including a portion in the at least one light-emitting region; and
and the at least one auxiliary electrode is connected with the cathode layer in parallel, wherein the at least one auxiliary electrode is positioned in the non-luminous area.
2. The display panel of claim 1, wherein the display panel further comprises a retaining wall structure defining at least one of the light emitting regions and located in the non-light emitting region, and a first encapsulation layer disposed on the retaining wall structure, wherein the cathode layer is located between the retaining wall structure and the first encapsulation layer, and wherein at least one of the auxiliary electrodes is disposed on the first encapsulation layer and is overlapped with the cathode layer through a via hole.
3. The display panel according to claim 2, wherein the shortest distance from the auxiliary electrode to the light emitting region is greater than three times a first distance, and the first distance is equal to the sum of the thickness of the retaining wall structure, the thickness of the cathode layer, and the thickness of the first encapsulation layer correspondingly located on the retaining wall structure.
4. The display panel according to claim 2, wherein a side of the first encapsulation layer facing the auxiliary electrode is provided with a groove, and the auxiliary electrode is disposed in the groove.
5. The display panel according to claim 4, wherein a thickness of the auxiliary electrode is equal to a depth of the groove.
6. The display panel according to claim 1, further comprising an antireflection layer disposed on an upper surface of the auxiliary electrode, wherein a front projection of the antireflection layer on the auxiliary electrode covers the auxiliary electrode.
7. The display panel of claim 6, wherein the anti-reflective layer comprises a black matrix layer.
8. The display panel according to claim 1, wherein each of the auxiliary electrodes corresponds to one or more of the light-emitting regions.
9. The display panel according to claim 1, wherein the display panel comprises a plurality of auxiliary electrodes, and the plurality of auxiliary electrodes are uniformly distributed in a display area of the display panel.
10. A display device characterized in that the display device comprises the display panel according to any one of claims 1 to 9.
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| CN202110163076.6A CN112993182B (en) | 2021-02-05 | 2021-02-05 | Display panel and display device |
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| CN112993182B (en) | 2022-11-01 |
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