CN109037481B - Organic light-emitting display cover plate, manufacturing method, display panel and display device - Google Patents
Organic light-emitting display cover plate, manufacturing method, display panel and display device Download PDFInfo
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- CN109037481B CN109037481B CN201810865023.7A CN201810865023A CN109037481B CN 109037481 B CN109037481 B CN 109037481B CN 201810865023 A CN201810865023 A CN 201810865023A CN 109037481 B CN109037481 B CN 109037481B
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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
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
The invention discloses an organic light-emitting display cover plate, a manufacturing method thereof, a display panel and a display device. Specifically, the present invention provides an organic light emitting display cover plate, including: a substrate; an auxiliary cathode disposed on the substrate; and the spacer is arranged on one side of the auxiliary cathode, which is far away from the substrate, and comprises a conductive material, and the spacer is electrically connected with the auxiliary cathode. Therefore, the auxiliary cathode can be simply and conveniently electrically connected with the cathode of the organic light-emitting display back plate through the spacer, the conductivity of the cathode is improved, and the service performance of the organic light-emitting display panel is further improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light-emitting display cover plate, a manufacturing method of the organic light-emitting display cover plate, a display panel and a display device.
Background
Organic electroluminescent (OLED) display technology has become a research hotspot in the field of photoelectric display technology due to its advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, extremely high response speed, ultra-light and thin weight, flexible display, rollable screen, strong temperature adaptability, simple manufacturing process, and the like. The top-emitting AMOLED (passive organic electroluminescent diode) can effectively solve the problems of aperture ratio reduction and display screen brightness reduction caused by a complex TFT (thin film field effect transistor) compensation circuit, and meanwhile, the color gamut of the AMOLED display screen can be improved by utilizing the microcavity effect existing in the top-emitting AMOLED device structure, so that the display effect is improved. As part of the top-emitting AMOLED that must project, the light transmittance and conductivity of the transparent cathode are critical factors. Common cathode materials such as aluminum, magnesium-aluminum and silver can have good transmittance only when the cathode materials are very thin, but the cathode layers are too thin, so that circuit breaking or metal oxidation can be caused, effective ohmic contact cannot be formed, and the brightness of the display screen is uneven; when the cathode is made of materials with high transparency such as indium tin oxide, indium zinc oxide and the like, the resistance of the cathode is high, and the conductivity is low, so that the conductivity can be increased only by arranging the auxiliary cathode.
However, there is still a need for improvement in the top emission organic light emitting display cover plate, the manufacturing method thereof, and the display device.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the inventor finds that the auxiliary cathode in the current top-emitting AMOLED (passive organic electroluminescent diode) has poor electrical connection performance with the cathode, and often has the problem that the auxiliary cathode cannot play a role because the auxiliary cathode cannot be effectively connected. The inventor finds out through intensive research and a great deal of experiments that the auxiliary cathode and the cathode are electrically connected at present, and the conductive material, the arrangement position and the manufacturing process of the conductive material have defects. At present, the top emission AMOLED process generally sets the auxiliary cathode on the backplane, but when the auxiliary cathode is set on the organic light-emitting display backplane, the manufacturing process is complex and difficult to implement, and also faces the risk of short circuit of the wiring, and the yield of the product cannot be guaranteed. Moreover, since the back plate and the cover plate need to be packaged in the box, a certain extrusion force exists at this time, and the conductive material (such as ITO) disposed around the spacer is easily broken, and thus the auxiliary cathode and the cathode are disconnected, and thus the auxiliary cathode cannot be effectively electrically connected, and the auxiliary cathode cannot effectively function, and the broken ITO is also easily crushed against the cathode (such as indium zinc oxide, IZO), which causes a black spot problem, and further reduces the usability and product yield of the organic light emitting display panel. Therefore, if a new organic light emitting display cover plate can be provided, the above problems can be solved to a great extent by simply and effectively electrically connecting the auxiliary cathode disposed on the cover plate and the cathode on the back plate.
The present invention aims to alleviate or solve at least to some extent at least one of the above mentioned problems.
In one aspect of the present invention, an organic light emitting display cover is provided. According to an embodiment of the present invention, the organic light emitting display cover plate includes: a substrate; an auxiliary cathode disposed on the substrate; and the spacer is arranged on one side of the auxiliary cathode, which is far away from the substrate, and comprises a conductive material, and the spacer is electrically connected with the auxiliary cathode. Therefore, the auxiliary cathode can be simply and effectively electrically connected with the cathode of the organic light-emitting display back plate through the spacer, the open circuit is not easy to occur, the conductivity of the cathode can be better improved, and the service performance and the product yield of the organic light-emitting display panel are further improved.
According to an embodiment of the present invention, the spacer includes a column having elasticity, and conductive particles mixed in the column, the conductive particles being configured to form a conductive path communicating a top surface and a bottom surface of the column, wherein the top surface or the bottom surface of the column is in contact with the auxiliary cathode. Therefore, the column body mixed with the conductive particles can simply, conveniently and effectively connect the auxiliary cathode and the cathode, is not easy to cause open circuit, is more favorable for electric conduction among the conductive particles under the action of extrusion force when the back plate and the cover plate are opposite to each other, and further improves the service performance and the product yield of the organic light-emitting display cover plate.
According to an embodiment of the present invention, the material forming the columnar body includes polystyrene; the conductive particles comprise at least one of metal nano conductive balls and carbon nano conductive balls. Therefore, the elasticity and the conductivity of the formed spacer are further improved, and the service performance and the product yield of the organic light-emitting display cover plate are improved.
According to an embodiment of the invention, the spacer is formed of a metal comprising at least one of indium tin oxide, indium zinc oxide, gold, silver, copper. Therefore, the spacer is directly formed by the conductive metal, the auxiliary cathode and the cathode can be well connected, the connection efficiency of the auxiliary cathode and the cathode is further improved, the conductivity of the cathode is improved, and the use performance and the product yield of the organic light-emitting display cover plate are improved.
According to an embodiment of the present invention, the organic light emitting display cover plate further includes: the conductive layer is arranged on one side, far away from the substrate, of the auxiliary cathode, and the conductive layer is arranged around the spacer. Therefore, the conductive layer can be used together with the spacer comprising the conductive material to better electrically connect the auxiliary cathode and the cathode, so that the conductivity of the cathode is improved, and the service performance of the organic light-emitting display cover plate is improved.
According to an embodiment of the present invention, the organic light emitting display cover plate further includes: a black matrix disposed on the substrate and defining a plurality of color display regions on the substrate; the auxiliary cathodes are arranged on one side, far away from the substrate, of the black matrix, and the orthographic projection of the auxiliary cathodes on the substrate is located in the orthographic projection range of the black matrix on the substrate. Therefore, the auxiliary cathode does not influence the display area and the display performance of the organic light-emitting display cover plate, and the use performance of the organic light-emitting display cover plate is improved.
In another aspect of the present invention, a method of fabricating an organic light emitting display cover plate is provided. According to an embodiment of the invention, the method comprises: providing a substrate; forming an auxiliary cathode on the substrate; and forming a spacer on one side of the auxiliary cathode, which is far away from the substrate, wherein the spacer comprises a conductive material and is electrically connected with the auxiliary cathode. Therefore, the method can simply and conveniently connect the auxiliary cathode and the cathode by using the spacer, is not easy to break, can better improve the conductivity of the cathode, and further improves the service performance and the product yield of the organic light-emitting display panel.
According to an embodiment of the invention, forming the spacer comprises: mixing conductive particles with an elastic material to form the columnar spacer, and controlling a mixing ratio of the conductive particles and the elastic material so that the conductive particles can form a conductive path connecting a top surface and a bottom surface of the columnar spacer, wherein the top surface or the bottom surface is in contact with the auxiliary cathode. Therefore, the method can simply and conveniently manufacture the spacer mixed with the conductive particles and the elastic material, the spacer can simply, conveniently and effectively connect the auxiliary cathode and the cathode, the open circuit is not easy to cause, and when the back plate and the cover plate are opposite to each other, the spacer is more favorable for the electric conduction among the conductive particles under the action of the extrusion force, so that the service performance and the product yield of the organic light-emitting display cover plate are further improved.
In yet another aspect of the present invention, an organic light emitting display panel is provided. According to an embodiment of the present invention, the organic light emitting display panel includes the organic light emitting display cover plate described above, or includes the organic light emitting display cover plate prepared by the method described above. Therefore, the organic light emitting display panel has all the features and advantages of the organic light emitting display cover plate and the organic light emitting display cover plate prepared by the method for manufacturing the organic light emitting display cover plate, and the description is omitted here. In general, the organic light-emitting display panel has better service performance and higher product yield.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes the organic light emitting display panel described above. Therefore, the display device has all the features and advantages of the organic light emitting display panel, which are not described herein again. Generally, the display device has better service performance and higher product yield.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic structural view of an organic light emitting display cover plate according to an embodiment of the present invention;
fig. 2 is a schematic view showing a structure of an organic light emitting display cover plate according to another embodiment of the present invention;
fig. 3 shows a schematic structural view of an organic light emitting display cover plate according to still another embodiment of the present invention;
fig. 4 is a schematic structural view illustrating an organic light emitting display cover plate according to still another embodiment of the present invention;
FIG. 5 is a schematic view showing a structure of an organic light emitting display cover plate according to still another embodiment of the present invention;
fig. 6 is a schematic view showing a structure of an organic light emitting display cover plate according to still another embodiment of the present invention;
fig. 7 is a schematic view showing a structure of an organic light emitting display cover plate according to still another embodiment of the present invention;
fig. 8 is a schematic structural view illustrating an organic light emitting display cover plate according to still another embodiment of the present invention;
FIG. 9 shows a flowchart of a method of fabricating an organic light emitting display cover plate according to one embodiment of the present invention;
FIG. 10 is a flow chart illustrating a method of fabricating an organic light emitting display cover plate according to another embodiment of the present invention;
fig. 11 shows a schematic structural view of an organic light emitting display panel according to an embodiment of the present invention; and
fig. 12 is a schematic view showing a structure of a display device according to an embodiment of the present invention.
Description of reference numerals:
100: a substrate; 200: an auxiliary cathode; 300: a spacer; 10: conductive particles; 400: a conductive layer; 500: a black matrix; 600: a color filter film; 700: a planarization layer; 1000: an organic light emitting display cover plate; 1100: an organic light emitting display backplane; 1200: an organic light emitting display panel; 1300: a display device.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the present invention, an organic light emitting display cover is provided. According to an embodiment of the present invention, referring to fig. 1, an organic light emitting display cover plate 1000 includes a substrate 100, an auxiliary cathode 200, and a spacer 300, wherein the auxiliary cathode 200 is disposed on the substrate 100 (referring to the auxiliary cathode 200 illustrated in fig. 1 disposed at the bottom of the substrate 100), the spacer 300 is disposed at a side of the auxiliary cathode 200 away from the substrate 100, wherein the spacer 300 includes a conductive material, and the spacer 300 and the auxiliary cathode 200 are electrically connected. Therefore, the auxiliary cathode 200 and the cathode (not shown in the figure, for example, referring to fig. 1, the cathode is located at the bottom of the spacer 300) of the organic light emitting display backplane can be electrically connected simply and effectively through the spacer 300, and an open circuit is not easily generated between the auxiliary cathode 200 and the cathode, so that the auxiliary cathode 200 can better improve the conductivity of the cathode, and further improve the service performance and the product yield of the organic light emitting display panel.
For ease of understanding, the following briefly describes the principle by which the organic light emitting display cover according to an embodiment of the present invention can achieve the above advantageous effects:
as described above, in a top emission AMOLED (passive organic electroluminescent diode), there are many problems in electrical connection between an auxiliary cathode and a cathode, for example, a conductive material (e.g., ITO) disposed around the auxiliary cathode and a spacer for electrically connecting the auxiliary cathode and the cathode, and the conductive material (e.g., ITO) is easily broken due to a certain pressing force during a process of encapsulating a back plate and a cover plate into a case, thereby causing disconnection between the auxiliary cathode and the cathode, failing to effectively electrically connect the auxiliary cathode, and easily crushing the cathode (e.g., indium zinc oxide, IZO), causing black spots, and further reducing the performance and yield of the organic light emitting display panel. According to the organic light emitting display cover plate of the embodiment of the invention, the auxiliary cathode is manufactured on the cover plate, and the spacer itself is manufactured to be conductive, so that the spacer can simply and efficiently connect the auxiliary cathode and the cathode. When the cover plate and the back plate are matched to prepare the display device, only the cathode or the conducting layer electrically connected with the cathode is needed to be arranged at the position, which is contacted with the spacer, on the back plate, so that the electrical connection between the cathode and the auxiliary cathode can be realized, the electrical conductivity of the cathode in the display device can be improved, a conducting material which is specially used for electrically connecting the auxiliary cathode and the cathode is not needed to be specially arranged at the periphery of the auxiliary cathode and the spacer, the production process is saved, the problems that the auxiliary cathode cannot effectively play a role and the like due to the fracture of the conducting material are avoided, and the service performance and the product yield of the organic light-emitting display panel are improved.
According to an embodiment of the present invention, the specific shape of the spacer 300 is not particularly limited as long as it can serve as a support and connection function when the cover plate and the back plate encapsulate the cartridge, and can electrically connect the auxiliary cathode and the cathode. Specifically, referring to fig. 1 and 2, the spacer 300 may be a column, and more specifically, the cross section of the spacer 300 may be rectangular (as shown in fig. 1), trapezoidal (as shown in fig. 2), or the like.
According to some embodiments of the present invention, the spacer 300 includes a conductive material, and particularly, the type of the conductive material is not particularly limited, for example, according to some embodiments of the present invention, the spacer 300 may be directly formed of a metal having good conductive performance, so that the auxiliary cathode and the cathode may be efficiently electrically connected, the conductivity of the cathode may be increased, and the usability and the product yield of the organic light emitting display cover plate may be improved. Specifically, the metal forming the spacer 300 may include at least one of indium tin oxide, indium zinc oxide, gold, silver, copper, and the like. Thus, the metal material forming the spacer 300 has a wide source and good electrical conductivity. It should be noted that, when the spacer 300 is directly formed by a conductive metal, the formed spacer 300 is rigid and has no elasticity, and at this time, the pixel defining layer on the back plate matched with the cover plate can be made to be elastic, so that the box-to-box elasticity of the cover plate and the back plate can be ensured, and the cover plate and the back plate can be conveniently packaged to form the organic light-emitting display panel. Since the elastic material is also a common material for fabricating the pixel defining layer, the fabrication cost of the backplane is not significantly increased by this design.
According to other embodiments of the present invention, the spacer 300 may also be formed of an elastic material, and the conductive function of the spacer may be achieved by filling conductive particles therein. Specifically, referring to fig. 3, the spacer 300 may include a column body having elasticity, and the top surface or the bottom surface of the column body (i.e., the spacer 300) is in contact with the auxiliary cathode 200 (the top surface and the bottom surface refer to the top and bottom directions shown in fig. 3, and fig. 3 shows that the top surface of the spacer 300 is in contact with the auxiliary cathode 200), whereby the spacer 300 may secure the box-to-box elasticity of the cover plate and the back plate, and the conductive particles 10 may be mixed in the column body, and the conductive particles 10 may form a conductive path connecting the top surface and the bottom surface of the column body. Therefore, the column body mixed with the conductive particles 10 can simply and effectively electrically connect the auxiliary cathode 200 and the cathode (not shown in the figure, generally arranged on the back plate), so that the open circuit is not easy to cause, the conductivity of the cathode is improved, and when the back plate and the cover plate are opposite to each other, the conductive particles 10 can be mutually extruded under the action of extrusion force, thereby being beneficial to electric conduction, being more beneficial to the conductive particles to form the conductive path, and further improving the service performance and the product yield of the organic light-emitting display cover plate.
According to an embodiment of the present invention, a material forming the columnar body is not particularly limited as long as it has elasticity, and may include, for example, Polystyrene (PS) or the like. According to an embodiment of the present invention, a specific material of the conductive particles 10 is not particularly limited, for example, the conductive particles 10 may include at least one of metal nano conductive balls and carbon nano conductive balls. Therefore, the conductive particles are wide in material source and good in conductivity, the conductivity of the formed spacer is further improved, and the service performance and the product yield of the organic light-emitting display cover plate are improved. Specifically, the conductive particles 10 may be gold balls, silver balls, or the like, and may be carbon nano conductive balls. Alternatively, according to an embodiment of the present invention, the conductive carbon nanomaterial may be coated on the outer surface of the polymer microsphere or the silica microsphere to form the composite conductive particle. Therefore, the inner core of the composite particle formed by the carbon nano conductive material has elasticity, after the composite particle is filled into the elastic material (used for forming an elastic columnar body), the elasticity of the spacer can be further improved, the box-to-box packaging of the cover plate and the back plate is facilitated, and the carbon nano conductive balls are mutually extruded more easily under the extrusion force generated in the box-to-box process, so that the auxiliary cathode and the cathode are electrically connected more effectively. Specifically, the specific type of the carbon nanomaterial is not particularly limited, and may be, for example, a carbon nanotube, a carbon fiber, graphene, or the like. Specifically, the specific manner of doping the conductive particles 10 in the columnar bodies is not particularly limited, and for example, the conductive particles 10 and the elastic material (for example, PS) forming the columnar bodies may be mixed at a certain ratio and subjected to a defoaming treatment or the like.
According to an embodiment of the present invention, referring to fig. 4 and 5, the organic light emitting display cover plate 1000 may further include a conductive layer 400, the conductive layer 400 is disposed on a side of the auxiliary cathode 200 away from the substrate 100, and the conductive layer 400 is disposed around the spacer 300. Therefore, the conductive layer 400 can cooperate with the spacer 300 including a conductive material to better electrically connect the auxiliary cathode 200 and the cathode (not shown in the figure), thereby improving the conductivity of the cathode and improving the performance of the organic light emitting display cover plate. According to the embodiment of the present invention, a specific material for forming the conductive layer 400 is not particularly limited, and may be, for example, ITO, and since a work function value of ITO (highest occupied molecular orbital (HOMO) level is 5.3eV) is relatively close to that of a cathode formed of IZO (HOMO level is 5.2eV), when the conductive layer is formed of ITO and used as a climbing connection electrode between an auxiliary cathode and a cathode, electron transport is fast, and conductivity of the cathode is further improved. According to an embodiment of the present invention, the position where the conductive layer 400 is disposed is not particularly limited as long as the auxiliary cathode 200 and the cathode can be connected, for example, referring to fig. 4, the conductive layer 400 may be disposed only at the periphery of the auxiliary cathode 200 and the spacer 300; referring to fig. 5, the conductive layer 400 may also be disposed on the entire periphery of the substrate 100, the auxiliary cathode 200, and the spacer 300. It should be noted that, because the spacer itself does not have conductivity in the current process of fabricating the organic cover plate, a conductive layer (e.g., an ITO layer) is disposed on the auxiliary cathode and the periphery of the spacer to electrically connect the auxiliary cathode and the cathode, whereas the organic light emitting display cover plate according to the embodiment of the present invention, the spacer itself is conductive, so that the auxiliary cathode and the cathode can be electrically connected without disposing a conductive layer (e.g., an ITO layer) on the auxiliary cathode and the periphery of the spacer. According to some embodiments of the present invention, as described above, the original manufacturing process of disposing the conductive layer (e.g., ITO layer) on the periphery of the auxiliary cathode and the spacer may be maintained, and only the spacer is made conductive, so that the original manufacturing process is not changed, and the performance and yield of the manufactured organic light emitting display cover plate may be improved. Moreover, when the cover plate and the back plate are opposite to the box, even if the conducting layer (such as an ITO layer) is broken, the conducting particles in the spacer can transfer electricity to the broken ITO, the electric connection between the auxiliary cathode and the cathode is not influenced, the conducting layer (such as the ITO layer) further improves the electric connection efficiency between the auxiliary cathode and the cathode, further improves the electric conductivity of the cathode and further improves the service performance of the organic light-emitting display cover plate.
Referring to fig. 6 to 8, the organic light emitting display cover 1000 further includes, according to an embodiment of the present invention: a black matrix 500 and a plurality of auxiliary cathodes 200 (corresponding to the plurality of spacers 300), wherein the black matrix 500 is disposed on the substrate 100 and defines a plurality of color display regions on the substrate 100, and a color filter 600 may be disposed in the plurality of color display regions to implement a colorized display, for example, as shown in fig. 6, a red filter 600A, a green filter 600B, and a blue filter 600C may be disposed in 3 color display regions, respectively. At the bottom of the black matrix 500 and the color filter 600 (in the "bottom" direction as shown), a planarization layer 700 may be disposed. The auxiliary cathodes 200 may be disposed on a side of the planarization layer 700 away from the black matrix 500 and the color filter 600, and the spacers 300 corresponding to the auxiliary cathodes 200 are disposed on a side of the auxiliary cathodes 200 away from the planarization layer 700, specifically, the spacers 300 may be formed of a conductive metal (as shown in fig. 6), the spacers 300 may also be formed of an elastic material (e.g., PS) mixed with the conductive particles 10 (as shown in fig. 7), and further, the conductive layer 400 may also be formed on the periphery of the spacers 300 and the bottom of the planarization layer 700 (as shown in fig. 8) formed of the elastic material (e.g., PS) mixed with the conductive particles 10. According to an embodiment of the present invention, the orthographic projection of the auxiliary cathode 200 on the substrate 100 is located within the range of the orthographic projection of the black matrix 500 on the substrate 100. Therefore, the auxiliary cathode 200 does not affect the color display area and the display performance of the organic light emitting display cover 1000, and the use performance of the organic light emitting display cover is improved. According to the embodiment of the present invention, the orthographic projection of the auxiliary cathode 200 on the substrate 100 may coincide with the orthographic projection of the black matrix 500 on the substrate 100, and thus, the area of the auxiliary cathode disposed may be as large as possible, thereby increasing the conductivity of the cathode as large as possible and improving the performance of the organic light emitting display panel.
In another aspect of the present invention, a method of fabricating an organic light emitting display cover plate is provided. According to an embodiment of the present invention, the organic light emitting display cover plate manufactured by the method may be the organic light emitting display cover plate described above, and thus, the organic light emitting display cover plate manufactured by the method may have all the features and advantages of the organic light emitting display cover plate described above, and will not be described herein again. Referring to fig. 9, the method includes, according to an embodiment of the present invention:
s100: providing a substrate
In this step, a substrate is provided. The specific type of the substrate 100 is not particularly limited and may be selected by one skilled in the art according to actual needs, according to embodiments of the present invention. For example, the substrate 100 may be glass, according to an embodiment of the present invention.
According to an embodiment of the present invention, in order to further improve the performance of the organic light emitting display cover plate manufactured by the method, referring to fig. 10, the method may further include the steps of:
s10: forming a black matrix
In this step, a black matrix is formed on the substrate described previously. According to an embodiment of the present invention, the black matrix may be formed to define a plurality of color display regions on the substrate. Specifically, the material and the manufacturing method for forming the black matrix may be conventional technical means in the art, and are not described herein again.
S20: forming a color filter
In this step, the color filter (CF layer) is formed in the plurality of color display regions defined on the substrate by the black matrix as described above, and according to an embodiment of the present invention, a specific method for forming the color filter is not particularly limited, and for example, a CF material may be coated by slit coating (slit coating), and then subjected to pre-baking, exposure, development, post-baking, and the like, and patterned to form the color filter.
S30: forming a planarization layer
In this step, a planarization layer is formed on the side of the black matrix and the color filter film away from the substrate, so as to improve the flatness of the cover plate, facilitate the subsequent steps, and the like. According to an embodiment of the present invention, a specific method of forming the planarization layer is not particularly limited, and for example, a material of the planarization layer may be applied by spin coating (spin coating), and then subjected to pre-baking, exposure, development, post-baking, etc., and patterned to form the planarization layer. Specifically, the planarization layer may be formed to a thickness of about 2 μm.
S200: forming an auxiliary cathode
In this step, an auxiliary cathode is formed on the previously described planarization layer. According to the embodiment of the present invention, a specific material forming the auxiliary cathode is not particularly limited as long as it has a low resistance capable of improving the electrical conductivity of the cathode. For example, it may be a conductive metal or a metal compound, specifically, molybdenum/aluminum neodymium/molybdenum (Mo/AlNd/Mo), molybdenum neodymium/copper/molybdenum neodymium (MoNd/Cu/MoNd), or the like. According to an embodiment of the present invention, a method for preparing the auxiliary cathode is not particularly limited, and for example, a Mo/AlNd/Mo metal layer may be sequentially deposited on the planarization layer using a sputtering (Sputter) apparatus, or a MoNd/Cu/MoNd metal layer may be sequentially deposited, and then a photoresist may be coated on the metal layer, and the auxiliary cathode may be prepared through processes of exposure, development, etching, and the like.
S300: forming a spacer
In this step, a spacer is formed on a side of the aforementioned auxiliary cathode away from the planarization layer, wherein the spacer includes a conductive material, and the spacer is electrically connected to the auxiliary cathode. Specifically, the shape of the spacer and the material forming the spacer may be the same as those described above, and will not be described herein again. For example, the spacer may be formed of a conductive metal or an elastic material filled with conductive particles. According to an embodiment of the present invention, conductive particles may be mixed with an elastic material to form a columnar spacer, and a mixing ratio of the conductive particles and the elastic material is controlled such that the conductive particles may form a conductive path connecting a top surface and a bottom surface of the columnar spacer, wherein the top surface or the bottom surface is in contact with an auxiliary cathode. Therefore, the method can simply and conveniently manufacture the spacer mixed with the conductive particles and the elastic material, the spacer can simply, conveniently and effectively connect the auxiliary cathode and the cathode, the open circuit is not easy to cause, and when the back plate and the cover plate are opposite to each other, the spacer is more favorable for the electric conduction among the conductive particles under the action of the extrusion force, so that the service performance and the product yield of the organic light-emitting display cover plate are further improved.
According to the specific embodiment of the present invention, the elastic material may be PS, the conductive particles may be Au balls, or carbon nano conductive balls, and the conductive particles (e.g. carbon nano conductive balls) are filled in the PS, and may be prepared by the following method: mixing the carbon nano conductive ball according to the ratio of 100: 1-100: 50, doping the mixture into PS glue to obtain a carbon nano conductive PS preparation material; the carbon nano conductive PS preparation material is defoamed to obtain the carbon nano conductive PS glue (namely, the elastic material doped with conductive particles, namely, the spacer). Specifically, the carbon nano conductive ball can be prepared by the following method: introducing carbon nano tube powder into a solvent, performing ultrasonic treatment, stirring treatment and centrifugal treatment, and taking out supernatant to obtain a carbon nano dispersion liquid; providing polymer microspheres or silicon dioxide microspheres, adding the polymer microspheres or silicon dioxide microspheres and other template particles into the carbon nano dispersion liquid obtained in the previous step, and carrying out ultrasonic treatment to obtain uniformly dispersed carbon nano tubes or polymer microsphere mixed liquid or mixed liquid of the carbon nano tubes and the polymer microspheres; and centrifuging, filtering and drying the carbon nano mixed solution, and removing the solvent, impurities and template particles of the mixed solution to obtain the carbon nano conductive ball powder. Alternatively, according to an embodiment of the present invention, the conductive carbon nanomaterial may be coated on the outer surface of the polymer microsphere or the silica microsphere, and the polymer microsphere coated with the carbon nanomaterial is not removed at a later stage, so as to form the composite conductive particle.
In summary, the method can simply prepare the spacer capable of conducting electricity, and the auxiliary cathode and the cathode can be simply and conveniently connected by using the spacer, so that the open circuit is not easy to occur, the conductivity of the cathode can be better improved, and the service performance and the product yield of the organic light-emitting display panel are further improved.
In yet another aspect of the present invention, an organic light emitting display panel is provided. According to an embodiment of the present invention, referring to fig. 11, the organic light emitting display panel 1200 includes the organic light emitting display cover plate 1100 described above, or includes an organic light emitting display cover plate prepared by the method described above, and further includes an organic light emitting display back plate 1100 disposed at the bottom of the organic light emitting display cover plate 1000, and the organic light emitting display cover plate 1000 and the organic light emitting display back plate 1100 are connected to each other by spacers 300. As described above, the spacers 300 of the cap plate 1000 are conductive and electrically connected to the auxiliary cathodes. At this time, the cathode or the conductive structure electrically connected to the cathode is only required to be disposed at the position where the organic light emitting display back panel 1100 contacts the spacer 300, so that the electrical connection between the auxiliary cathode and the cathode can be achieved. Therefore, the organic light emitting display panel has all the features and advantages of the organic light emitting display cover plate and the organic light emitting display cover plate prepared by the method for manufacturing the organic light emitting display cover plate, and the description is omitted here. In general, the organic light-emitting display panel has better service performance and higher product yield.
In one aspect of the present invention, a display device is provided. According to an embodiment of the present invention, referring to fig. 12, the display device 1300 includes the organic light emitting display panel described above. Therefore, the display device has all the features and advantages of the organic light emitting display panel, which are not described herein again. Generally, the display device has better service performance and higher product yield.
In the description of the present invention, the terms "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (4)
1. An organic light emitting display cover sheet, comprising:
a substrate;
an auxiliary cathode disposed on the substrate;
a spacer disposed on a side of the auxiliary cathode away from the substrate, the spacer being located in a display area of the organic light emitting display cover plate, wherein the spacer includes a conductive material and is electrically connected to the auxiliary cathode, the spacer includes a column having elasticity and conductive particles mixed in the column, the conductive particles forming a conductive path between a top surface and a bottom surface of the column, wherein,
the top surface or the bottom surface of the columnar body is in contact with the auxiliary cathode,
the material forming the columnar bodies comprises polystyrene; the conductive particles comprise at least one of metal nano conductive balls and carbon nano conductive balls,
the organic light-emitting display cover plate further comprises a conductive layer, the conductive layer is arranged on one side of the auxiliary cathode far away from the substrate, and the conductive layer is arranged around the spacer;
further comprising:
a black matrix disposed on the substrate and defining a plurality of color display regions on the substrate;
the auxiliary cathodes are arranged on one side of the black matrix far away from the substrate, and the orthographic projection of the auxiliary cathodes on the substrate is located in the orthographic projection range of the black matrix on the substrate.
2. A method of making an organic light emitting display cover sheet, comprising:
providing a substrate;
forming an auxiliary cathode on the substrate;
forming a spacer on one side of the auxiliary cathode away from the substrate, wherein the spacer comprises a conductive material and is electrically connected with the auxiliary cathode, and the forming of the spacer comprises:
mixing conductive particles with an elastic material so as to form the columnar spacer, controlling a mixing ratio of the conductive particles and the elastic material so that the conductive particles form a conductive path communicating a top surface and a bottom surface of the columnar spacer, wherein,
the top surface or the bottom surface is in contact with the auxiliary cathode,
the elastic material comprises polystyrene; the conductive particles comprise at least one of metal nano conductive balls and carbon nano conductive balls,
the method further comprises forming a conductive layer disposed on a side of the auxiliary cathode remote from the substrate and surrounding the spacer,
the method further comprises forming a black matrix, wherein the black matrix is arranged between the substrate and the auxiliary cathode, and the orthographic projection of the auxiliary cathode on the substrate is positioned in the orthographic projection range of the black matrix on the substrate.
3. An organic light emitting display panel comprising the organic light emitting display cover sheet of claim 1 or the organic light emitting display cover sheet prepared by the method of claim 2.
4. A display device characterized by comprising the organic light-emitting display panel according to claim 3.
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| CN110148680B (en) * | 2019-04-30 | 2020-10-13 | 深圳市华星光电半导体显示技术有限公司 | Organic light emitting display panel and method of manufacturing the same |
| CN110112194A (en) * | 2019-04-30 | 2019-08-09 | 深圳市华星光电半导体显示技术有限公司 | Organic light emitting display panel and preparation method thereof |
| CN110137379B (en) * | 2019-05-31 | 2022-04-22 | 京东方科技集团股份有限公司 | Packaging cover plate, preparation method of packaging cover plate and display panel |
| CN110911583B (en) * | 2019-11-28 | 2022-07-01 | 京东方科技集团股份有限公司 | Organic light-emitting display cover plate, manufacturing method and display device |
| CN111403622B (en) * | 2020-03-26 | 2023-04-07 | 京东方科技集团股份有限公司 | OLED display panel, manufacturing method thereof and display device |
| CN111599936B (en) | 2020-05-25 | 2023-01-31 | 视涯科技股份有限公司 | Organic light-emitting display panel and preparation method thereof |
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