Patent ID: 12205961

Figure numeral description:

FIG. numeralPart name10Display panel100display substrate110base substrate120composite structure layer121first electrode layer122conductive layer123colloidal medium layer1231conductive particle part1231aconductive particle130insulating layer200light emitting device300encapsulation component

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Embodiments of the present application are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. It is clear that the described embodiments are part of embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments to those of skilled in the premise of no creative efforts obtained, should be considered within the scope of protection of the present application. Besides, it should be understood that the specific embodiments described herein are merely for illustrating and explaining the present application and are not intended to limit the present application. In this application, if no explanation is made to the contrary, the orientation words used such as “upper” and “lower” usually refer to the upper and lower of the device in actual use or working state, which specifically are the directions of the drawing in the figures; and “inner” and “outer” refer to the outline of the device.

The embodiment of the present application provides a display substrate, a display panel and a manufacturing method of the display substrate. The detail descriptions are respectively introduced below. It should be noted that the order of description in the following embodiments is not meant to limit the preferred order of the embodiments.

First, the embodiment of the present application provides a display substrate, comprising a base substrate and a composite structure layer. The composite structure layer comprises a conductive layer and a colloidal medium layer sequentially arranged on the base substrate. The colloidal medium layer comprises a plurality of conductive particles. The plurality of conductive particles are located at a position of the colloidal medium layer close to the conductive layer to form a conductive particle part.

FIG.1is a structural diagram of a display substrate provided by an embodiment of the present application. As shown inFIG.1, the display substrate100comprises a base substrate110for supporting respective film structures of the display substrate100. The adopted base substrate110may be a glass substrate or substrates of other types, and its specific material can be adjusted according to actual design requirements, and there is no limitation here.

The display substrate100comprises a composite structure layer120. The composite structure layer120is arranged on the base substrate110and serves as a functional layer of the display substrate100. According to different positions of the composite structure layer120, the specific structure of the composite structure layer120is different, and the role of the composite structure layer120is also different.

The composite structure layer120comprises a conductive layer122. The conductive layer122is arranged on the base substrate110. According to the position of the composite structure layer120, the conductive layer122corresponds to different metal film layers. After the conductive layer122is formed on the base substrate110, the conductive layer122needs to be processed to obtain the target pattern, which is convenient for the subsequent film layer preparation.

The composite structure layer120comprises a colloidal medium layer123, and the colloidal medium layer123is arranged on the base substrate110and the conductive layer122. As shown inFIG.6andFIG.7, the colloidal medium layer123comprises a plurality of conductive particles1231a. The plurality of conductive particles1231aare located at a position of the colloidal medium layer123close to the conductive layer122to form a conductive particle part1231. Namely, the conductive particle part1231is a part of the colloidal medium layer123.

That the plurality of conductive particles1231aare located at a position of the colloidal medium layer123close to the conductive layer122means that the plurality of conductive particles1231ain the colloidal medium layer123are deposited on the conductive layer122to increase the overall thickness of the conductive layer122and to decrease the resistance of the conductive layer122, to prevent uneven display brightness at the remote end corresponding to the input point during the driving process of the display substrate100due to voltage attenuation or current attenuation.

Specifically, before the plurality of conductive particles1231aare deposited on the conductive layer122to form a conductive particle part1231, the conductive particles1231aare dispersed in the colloidal medium layer123. By processing the colloidal medium layer123, the conductive particles1231aare moved to the corresponding position of the conductive layer122and deposited on the conductive layer122, thereby forming the conductive particle part1231.

The pattern shape of the conductive particle part1231is the same as the pattern shape of the conductive layer122, that is, the line width of the conductive particle part1231and the line width of the conductive layer122are the same. It is avoided that when the conductive particle part1231is formed on the conductive layer122, the edge of the conductive particle part1231and the conductive layer122form an undercut structure, to avoid that the conductive particle part1231and the edge of the conductive layer122break down during the use of the display substrate100and cause the display substrate100to be short-circuited and fail.

The other part of the colloidal medium layer123covers the conductive particle part1231, so that the conductive particle part1231is separated from the subsequent film layers, so as to separate the signal metal lines between different film layers and avoid short circuits. Meanwhile, the other part of the colloidal medium layer123can also separate the conductive particle parts1231of the same layer to separate the signal metal lines in the same film layer to avoid mutual crosstalk.

The display substrate100in the embodiment of the present application comprises a base substrate110and a composite structure layer120. The composite structure layer120comprises a conductive layer122and a colloidal medium layer123sequentially arranged on the base substrate110. The colloidal medium layer123comprises a plurality of conductive particles1231a. The plurality of conductive particles1231aare located at a position of the colloidal medium layer123close to the conductive layer122to form a conductive particle part1231. By making the plurality of conductive particles1231ain the colloidal medium layer123to form a conductive particle part1231at the position close to the conductive layer122, the thickness of the conductive layer122can be increased and the resistance of the conductive layer122can be reduced; by directly forming the colloidal medium layer123on the base substrate110and the conductive layer122, the height difference between the conductive layer122and the edge of the conductive particle part1231can be reduced, and the risk of fracture or breakdown of the conductive layer122and the edge of the conductive particle part1231can be reduced.

Optionally, the display substrate100comprises a plurality of the composite structure layers120sequentially arranged along a direction away from the base substrate110. The arrangement of the multiple composite layers can further reduce the resistance of the conductive layer122, thereby reducing the internal resistance of the display substrate100to prevent uneven display brightness at the remote end corresponding to the input point during the driving process of the display substrate100due to voltage attenuation or current attenuation.

The multiple composite structure layers120can be arranged continuously or at intervals, that is, the conductive film layers in the display substrate100can all adopt the form of the composite structure layer120, which cannot only reduce the overall internal resistance of the display substrate100, but also can prevent the edge of the conductive film layer from fracture or breakdown, thereby improving the display effect of the display substrate100.

Optionally, a thickness of the conductive layer122is greater than or equal to 0.1 micrometer, and less than or equal to 0.6 micrometer. If the thickness of the conductive layer122is too large, when the conductive layer122is etched, the line width value of the conductive layer122will deviate from the design value, and when the line width value of the conductive layer122is smaller, the conductive layer122is hardly to be etched; if the etching time is increased or the concentration of the developer solution is increased, over-etching is likely to occur, and even the entire surface of the conductive layer122may be etched away.

If the thickness of the conductive layer122is too small, on the one hand, the accuracy requirements of the equipment will be increased and the production cost will be increased; on the other hand, the resistance of the conductive layer122will be too large, which will affect the display effect. In the actual manufacturing process, the thickness of the conductive layer122is set to 0.1 micrometer, 0.3 micrometer, 0.5 micrometer or 0.6 micrometer, etc. The specific thickness value can be adjusted according to design requirements, and there is no special limitation here.

Optionally, a thickness of the conductive particle part1231is greater than or equal to 1 micrometer, and less than or equal to 50 micrometers. The conductive particle part1231is employed to increase the overall thickness of the conductive layer122. If the thickness of the conductive particle part1231is too small, the overall thickness of the conductive layer122will be less changed, and the thickness of the conductive layer122cannot be effectively reduced to reduce the resistance of the conductive layer122, so that the display effect of the display substrate100cannot be improved.

If the thickness of the conductive particle part1231is too large, the overall thickness of the display substrate100will be too large, which will increase the manufacturing cost of the display substrate100on one hand; on the other hand, it is not conducive to the overall structural design of the display substrate100, and affects the display effect of the display substrate100. In the actual manufacturing process, the thickness of the conductive particle part1231is set to 1 micrometer, 5 micrometer, 10 micrometer, 30 micrometer or 50 micrometer, etc. The specific thickness value can be adjusted according to design requirements, and there is no special limitation here.

It should be noted that the thickness of the conductive particle part1231can be adjusted according to the content of the conductive particles1231a in the colloidal medium layer123and the coating thickness of the colloidal medium layer123. If it is necessary to increase the thickness of the conductive particle part1231, the content of the conductive particles1231ain the colloidal medium layer123is increased or the coating thickness of the colloidal medium layer123is increased; if it is necessary to decrease the thickness of the conductive particle part1231, the content of the conductive particles1231ain the colloidal medium layer123is decreased or the coating thickness of the colloidal medium layer123is decreased.

Optionally, a material of the conductive layer122is the same as a material of the conductive particles1231a. Namely, the conductive layer122and the conductive particle part1231are made of the same material. When the conductive particle part1231is formed, the surface energy matching of the conductive particles1231aand the conductive layer122and the surface tension of the conductive layer122make the conductive particles1231amove in the colloidal medium layer123to the surface of the conductive layer122and are deposited. By selecting the conductive layer122and the conductive particles1231aof the same material, the surface energy matching between the conductive layer122and the conductive particles1231acan be improved, which is beneficial to the smooth deposition of the conductive particles1231aon the surface of the conductive layer122. Meanwhile, it is ensured that the conductive particle part1231and the conductive layer122possess a good structural strength, and the structural stability of the display substrate100is improved.

Specifically, the material of the conductive layer122and the material of the conductive particles1231acan be different. It is only necessary to ensure that the conductive particles1231acan be smoothly deposited on the conductive layer122under the action of the surface tension of the conductive layer122, and that there is sufficient structural strength between the conductive layer122and the conductive particle part1231to ensure the structural stability of the display substrate100.

Optionally, the material of the conductive particles1231ain the embodiment of the present application comprises one or more of copper, aluminum and silver. When selecting the type of conductive particles1231a, it is necessary to ensure that the conductive particles1231apossess good conductivity, but also to meet the surface energy matching between the conductive particles1231aand the conductive layer122to ensure that the conductive particles1231acan be smoothly deposited on the conductive layer122.

Optionally, the contour of the conductive particles1231acan be spherical, ellipsoidal or other regular shapes. The shape of the conductive particles1231adirectly affects the melting temperature of the conductive particles1231a, thereby affecting the process conditions in the manufacturing process of the display substrate100. In the actual manufacturing process, selecting conductive particles1231aof the same shape can ensure that the melting temperature of all conductive particles1231ais consistent, thereby facilitating the control of process conditions in the manufacturing process and improving the production yield.

Optionally, the display substrate100in the embodiment of the present application comprises an array substrate, and the array substrate comprises the composite structure layer120, and the conductive layer122and the conductive particle part1231of the composite structure layer120form a first electrode layer121. When the composite structure layer120is located in the thin film transistor layer of the array substrate, the first electrode layer121is a source and drain layer or a gate layer; the source and drain layer and the gate layer are the main metal layers of thin film transistors. By increasing the thickness of the source and drain layer or the gate layer, the resistance of the source and drain layer and the gate layer can be effectively reduced, and the resistance voltage drop in the driving process of the thin film transistor layer can be reduced.

In some embodiments, when the light-shielding metal layer on the base substrate110also needs to carry signals, a thick film layer manufacturing process is required to reduce the resistance of the light-shielding metal layer. At this time, the light-shielding metal layer can also adopt the manufacturing method of the composite structure layer120, that is, the first electrode layer121is a light-shielding metal layer.

In other embodiments, the first electrode layer121is the first common electrode of the array substrate, which is employed to reduce the resistance of the first common electrode and reduce the voltage drop or the current drop at different positions of the first common electrode. For the array substrate, when the thickness of a certain conductive layer122needs to be increased to reduce the resistance of the conductive layer122, the composite structure layer120can be adopted, which can effectively increase the thickness of the conductive layer122, and can also prevent the edge of the conductive layer122from fracture or breakdown, so as to ensure the stability of the array substrate.

Optionally, the array substrate comprises two layers of the composite structure layer120; the first electrode layer121of the composite structure layer120close to the base substrate110is the gate layer, and the other part corresponding to the colloidal medium layer123in the composite structure layer120is an interlayer medium layer; the first electrode layer121of the composite structure layer120far from the base substrate110is the source and drain layer, and the other part corresponding to the colloidal medium layer123in the composite structure layer120is a planarization layer. Through the arrangement of the composite structure layer120, the thicknesses of the gate layer and the source and drain layer in the array substrate are increased, and the voltage drop or the current drop of the metal lines of the gate layer and the source and drain layer is reduced.

Besides, the other part of the colloidal medium layer123in the composite structure layer120can not only isolate the metal lines on the gate layer and the source and drain layer, but also directly serve as the interlayer dielectric layer between the gate layer and the source and drain layer, and serve as the planarization layer on the source and drain layer without separately fabricating the corresponding film layer, which simplifies the manufacturing process; when the colloidal medium layer123needs to be formed with a hole, the traditional etching process can be directly employed to realize the connection of the gate layer or the source and drain layer with other film layers without increasing the difficulty of the manufacturing process.

Optionally, the first electrode layer121of the composite structure layer120close to the base substrate110is the light-shielding metal layer, and the other part corresponding to the colloidal medium layer123in the composite structure layer120is a buffer layer. The first electrode layer121of the composite structure layer120far from the base substrate110is the source and drain layer, and the other part corresponding to the colloidal medium layer123in the composite structure layer120is a planarization layer. Alternately, the first electrode layer121of the composite structure layer120close to the base substrate110is the light-shielding metal layer, and the other part corresponding to the colloidal medium layer123in the composite structure layer120is the buffer layer. The first electrode layer121of the composite structure layer120far from the base substrate110is the gate layer, and the other part corresponding to the colloidal medium layer123in the composite structure layer120is an interlayer medium layer. The specific position of the composite structure layer120can be adjusted according to design requirements, and there is no special restriction here.

Optionally, the display substrate100comprises a color filter substrate, and the color filter substrate comprises the composite structure layer120, and the conductive layer122and the conductive particle part1231of the composite structure layer120form a second electrode layer. The second electrode layer comprises a second common electrode layer. The conductive layer122and the conductive particle part1231form the second common electrode layer, which can reduce the voltage drop or the current drop at different positions on the second common electrode layer, thereby ensuring the display uniformity of the color filter substrate.

Specifically, the composite structure layer120mainly forms an electrode layer by forming the conductive layer122and the conductive particle part1231to form a high-thickness electrode layer, which reduces the resistance of the electrode layer while avoiding edge fracture or breakdown due to the increase in the thickness of the electrode layer. In the actual manufacturing process, any electrode layer of the display substrate100can be configured as a composite structure layer120according to design requirements to meet application requirements.

Optionally, the colloidal medium layer123in the embodiment of the present application comprises resin, such as bisphenol A epoxy resin, etc., which is mainly employed to accommodate the conductive particles1231a, so that the conductive particles1231acan be dispersed in the colloidal medium layer123before being deposited on the conductive layer122. The colloidal medium layer123further comprises a curing agent and a curing accelerator. The curing agent is employed to chemically react with the epoxy resin to form a three-dimensional network polymer, and the adopted curing agent is an amine substance; the curing accelerator is employed to react with the curing agent in the resin, to shorten the curing time of the resin gel, and facilitate the formation of the colloidal medium layer123.

The colloidal medium layer123further comprises a defoaming agent, which is employed to eliminate the foam generated during the production and usage of the epoxy resin. The defoaming agent mainly comprises higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropanolamine ether or polyoxypropylene glycerol ether and the like.

Besides, the colloidal medium layer123further comprises a diluent and an activator. The diluent is employed to adjust the uniformity of the colloid during the stirring process, and mainly comprises alcohol organic solvents, ether organic solvents and amide solvents, etc.; the activator is employed to reduce the surface tension of the conductive particles1231aand promote the deposition of the conductive particles1231aon the conductive layer122, and mainly comprises a compound of dibasic organic carboxylic acid and hydrohalide.

Optionally, as shown inFIG.2, an insulating layer130is provided on a side of the composite structure layer120away from the base substrate110. Since the other part of the colloidal medium layer123in the composite structure layer120is mainly organic material, it has poor barrier properties to water and oxygen in the air. The water and oxygen in the air can easily enter the interior of the display substrate100through the colloidal medium layer123, to corrode the functional structure in the display substrate100, affect the display effect of the display substrate100, and even cause the display substrate100to fail.

By providing the insulating layer130on the side of the composite structure layer120away from the base substrate110, the composite structure layer120can be protected. The water and oxygen in the air are prevented from entering the interior of the display substrate100through the colloidal medium layer123in the composite structure layer120, so as to ensure the display effect of the display substrate100.

The insulating layer130is made of an inorganic material, comprising one or more of silicon nitride, silicon dioxide and silicon oxynitride, which is beneficial to further improve the barrier ability of the insulating layer130to the water and oxygen in the air.

Optionally, a thickness of the insulating layer130is greater than or equal to 0.1 micrometer, and less than or equal to 1 micrometer. If the thickness of the insulating layer130is too small, it cannot effectively isolate the water and oxygen in the air; if the thickness of the insulating layer130is too large, the overall thickness of the display substrate100will be too large, which is not conducive to the overall structural design of the display substrate100. In the actual manufacturing process, the thickness of the insulating layer130is set to 0.1 micrometer, 0.3 micrometer, 0.5 micrometer, 0.8 micrometer or 1 micrometer. It can not only ensure the barrier ability to water and oxygen in the air, but also avoid the influence on the overall structure of the display substrate100. The specific thickness value can be adjusted accordingly according to the design requirements, and there is no special restriction here.

The embodiment of the present application provides a display panel. The display panel comprises a display substrate, and the specific structure of the display substrate refers to the aforesaid embodiments. Since this display panel adopts all the technical solutions of all the foregoing embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be repeated here.

FIG.3is a structural diagram of a display panel provided by an embodiment of the present application. As shown inFIG.3, the display panel10comprises a display substrate100, a light emitting device200and an encapsulation component300, wherein the light emitting device200is arranged on the display substrate100, and the encapsulation component300is arranged on the light emitting device200.

Specifically, the display panel10in the embodiments of the present application possesses a wide field of applications, including televisions, computers, mobile phones, foldable and rollable display screens in other display and lighting display devices, as well as wearable devices, such as smart bracelets and smart phones. All are within the scope of the application field of the display panel10in the embodiments of the present application.

At last, the embodiment of the present application further provides a manufacturing method of a display substrate. As shown inFIG.4, the manufacturing method of the display substrate100comprises steps of:

S100, providing a base substrate110. The adopted base substrate110may be a glass substrate or a flexible substrate, used to support respective film structures in the manufacturing process of the display substrate100. Before preparing subsequent film layers, the base substrate110needs to be cleaned first to avoid stains on the base substrate110from affecting the formation of subsequent film layers, so as to ensure the structural stability of the display substrate100.

S200, forming a conductive layer122on the base substrate110. As shown inFIG.5, the physical vapor deposition method is employed to deposit the conductive layer122on the base substrate110, and then according to the designed line width value, the conductive layer122is etched by the photolithographic process to form a target pattern layer.

The material of the conductive layer122comprises one or more of copper, aluminum and silver; the thickness of the conductive layer122is greater than or equal to 0.1 micrometer, and less than or equal to 0.6 micrometer, so as to make sure that the deposition thickness of the conductive layer122is within the manufacturing accuracy range of the physical vapor deposition equipment; meanwhile, it is prevented that the thickness of the conductive layer122is too large, when the conductive layer122is etched, the line width value of the conductive layer122will deviate from the design value, and when the line width value of the conductive layer122is smaller, the conductive layer122is hardly to be etched; if the etching time is increased or the concentration of the developer solution is increased, over-etching is likely to occur, and even the entire surface of the conductive layer122may be etched away.

S300, coating a colloidal medium layer123containing conductive particles1231aon the base substrate110and the conductive layer122, and depositing the conductive particles1231ain the colloidal medium layer123on the conductive layer122to form a conductive particle part1231.

As shown inFIG.6andFIG.7, after the conductive layer122is formed on the base substrate110, the colloidal medium layer123containing the conductive particles1231ais coated on the base substrate110and the conductive layer122. The colloidal medium layer123comprises resin, a curing agent, a curing accelerator, a defoaming agent, a diluent and an activator. By adjusting the content of different additives, the conductive particles1231aare uniformly dispersed in the colloidal medium layer123.

The materials of the conductive particles1231aand the conductive layer122can be the same or different. By changing the material types of the conductive particles1231aand the conductive layer122, the surface energy matching between the conductive particles1231aand the conductive layer122can be adjusted, to move the conductive particles1231ain the colloidal medium layer123to the surface of the conductive layer122under the action of surface tension, and to be deposited on the conductive layer122to form the conductive particle part1231.

Specifically, by adjusting the content of the conductive particles1231aand the coating thickness of the colloidal medium layer123, the thickness of the conductive particle part1231can be changed to meet the requirements of the thickness of the conductive particle part1231. In order to ensure the uniformity of the deposition of the conductive particle part1231and the adjustment of the process parameters, the shapes of the plurality of conductive particles1231ain the colloidal medium layer123are the same. That is, the plurality of conductive particles1231aare all spherical or ellipsoidal or any other shapes to ensure that the melting temperature of all particles is the same, which facilitates the setting of manufacturing process parameters and simplifies the process flow.

Specifically, Step S300mainly comprises the following content:

As shown inFIG.6andFIG.7, the colloidal medium layer123containing conductive particles1231ais coated on the base substrate110and the conductive layer122, and a heat treatment is implemented to the colloidal medium layer123to deposit the conductive particles1231ain the colloidal medium layer123on the conductive layer122to form a conductive particle part1231. By heating the colloidal medium layer123, the conductive particles1231ain the colloidal medium layer123are melted. Due to the better surface energy matching between the conductive particles1231aand the conductive layer122, the molten conductive particles1231amove to the conductive layer122in the colloidal medium layer123, and then it is cooled down to solidify the conductive particles1231aon the conductive layer122.

When heating the colloidal medium layer123, the temperature of the colloidal medium layer123is higher than the melting temperature of the conductive particles1231aby 5° C. to 50° C. to ensure that the conductive particles1231aare fully melted. It is avoided that the conductive particles1231acannot be completely deposited on the surface of the conductive layer122and affect the overall performance of the conductive particle part1231and the conductive layer122.

Specifically, when the display substrate100comprises a plurality of composite structure layer120, the foregoing steps can be repeated to realize the production of the plurality of composite structure layer120. The colloidal medium layer123of one composite structure layer120can function to isolate the conductive particle part1231of the composite structure layer120from the conductive layer122of the adjacent composite structure layer120. Meanwhile, according to design requirements, the colloidal medium layer123can be directly etched to form an opening, so as to realize the electrical connection between the conductive layer122and the conductive particle part1231, which are adjacent.

Optionally, after Step S300, the manufacturing method further comprises: forming an insulating layer130on the colloidal medium layer123.

Since the colloidal medium layer123in the composite structure layer120is mainly organic material except for the conductive particle part1231, it has poor barrier properties to water and oxygen in the air. The water and oxygen in the air can easily enter the interior of the display substrate100through the colloidal medium layer123, to corrode the functional structure in the display substrate100, affect the display effect of the display substrate100, and even cause the display substrate100to fail. By arranging the insulating layer130on the colloidal medium layer123, the composite structure layer120can be protected. The water and oxygen in the air are prevented from entering the interior of the display substrate100through the colloidal medium layer123in the composite structure layer120, so as to ensure the display effect of the display substrate100.

In the foregoing embodiments, the description of the various embodiments have respective different emphases, and a part in some embodiment, which is not described in detail can be referred to the related description of other embodiments.

The display substrate, the display panel and manufacturing method of the display substrate provided by the embodiments of the present application are described in detail as aforementioned, and the principles and implementations of the present application have been described with reference to specific illustrations. The description of the foregoing embodiments is merely for helping to understand the technical solutions of the present application and the core ideas thereof; meanwhile, those skilled in the art will be able to change the specific embodiments and the scope of the application according to the idea of the present application. In conclusion, the content of the specification should not be construed as limiting the present application.