Display panel, manufacturing method of display panel, and display device

Abstract

The present disclosure belongs to the technical field of display, and particularly relates to a display panel, a manufacturing method of the display panel and a display device. The display panel comprises a driving substrate and a display function layer formed on the driving substrate, the display function layer comprises a thermoelectric cooling material layer and an organic light-emitting material, the thermoelectric cooling material layer has a plurality of pixel openings, the thermoelectric cooling material layer is electrically connected with the driving substrate, and the organic light-emitting material is formed in each pixel opening. The present disclosure utilizes the characteristic that the thermoelectric cooling material layer is cooled under the action of voltage, provides a first target voltage to the thermoelectric cooling material layer at least in the curing process of the organic light-emitting material through the driving substrate, so that the thermoelectric cooling material layer can be reduced to a first target temperature under the action of the first target voltage, and the temperature at the edge of the organic light-emitting material is lower than that at the center, so as to reduce the possibility of the morphology of the thick edge and the thin center of the organic light-emitting material, and improve the display quality of the display panel.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a display panel, a method for manufacturing the display panel, and a display device. Background Technology

[0002] In the field of display technology, when organic light-emitting materials are formed on a substrate using solution methods such as inkjet printing, a coffee ring defect is prone to occur. That is, when the organic light-emitting material is spread on the substrate, the evaporation rate of the organic solvent at its edge is greater than that at the center. To compensate for the loss of organic solvent at the edge, capillary flow occurs inside the organic light-emitting material from the center to the edge. As the organic solvent flows towards the edge, it carries the organic solute to the edge, causing a large amount of organic solute to accumulate at the edge. After solidification, the organic light-emitting material will exhibit a coffee ring morphology that is thin in the center and thick at the edge, which will affect the display quality of the display panel. Summary of the Invention

[0003] The purpose of this application is to provide a display panel, a method for manufacturing a display panel, and a display device, which improves the display quality of the display panel by making the temperature at the edge of the organic light-emitting material lower than the temperature at its center, thereby reducing or avoiding the possibility of the organic light-emitting material having a thick edge and thin center morphology.

[0004] This disclosure provides a display panel, including:

[0005] Drive substrate;

[0006] A display functional layer is formed on the driving substrate. The display functional layer includes a thermoelectric cooling material layer and an organic light-emitting material. The thermoelectric cooling material layer has a plurality of pixel openings arranged in an array along the row and column directions. The thermoelectric cooling material layer is electrically connected to the driving substrate, and the organic light-emitting material is formed in each pixel opening.

[0007] The driving substrate is capable of providing a first target voltage to the thermoelectric cooling material layer during the curing process of the organic light-emitting material, and the thermoelectric cooling material layer is capable of being reduced to a first target temperature under the action of the first target voltage, so that the temperature at the edge of the organic light-emitting material is lower than the temperature at its center.

[0008] In one exemplary embodiment of this disclosure, during the curing process of the organic light-emitting material: the driving substrate can also stop providing the first target voltage to the thermoelectric cooling material layer when the curing thickness at the center of the organic light-emitting material reaches a set thickness value.

[0009] In one exemplary embodiment of this disclosure, the driving substrate can also provide a second target voltage to the thermoelectric cooling material layer when the temperature of the display panel is greater than a temperature set value. The thermoelectric cooling material layer can then be reduced to a second target temperature under the action of the second target voltage, so that the temperature of the display panel is less than or equal to the temperature set value.

[0010] In one exemplary embodiment of this disclosure, the first target voltage is the same as the second target voltage, and the first target temperature is the same as the second target temperature; and / or

[0011] The first target temperature range is -50℃ to 0℃, and the second target temperature range is -50℃ to 0℃; and / or

[0012] The thermoelectric cooling material layer is made of at least one of the following: bismuth telluride, sodium bismuth titanate-based ceramic material, barium strontium titanate, barium strontium niobate ceramic, barium strontium zirconate titanate ceramic, silver niobate ceramic, and sodium bismuth titanate-based thin film.

[0013] In an exemplary embodiment of this disclosure, the top area of ​​the pixel opening is larger than the bottom area of ​​the pixel opening, and the orthographic projection of the bottom of the pixel opening on the driving substrate is located within the orthographic projection of the top of the pixel opening on the driving substrate.

[0014] In one exemplary embodiment of this disclosure, the vertical cross-section of the pixel opening is an isosceles trapezoid; or

[0015] The pixel opening includes multiple opening segments arranged sequentially in the vertical direction and coaxial, wherein the top area of ​​the opening segment is greater than or equal to the bottom area of ​​the opening segment.

[0016] In this case, along the direction away from the driving substrate, the maximum area of ​​the multiple opening segments increases sequentially, and a stepped surface is formed at the junction of adjacent opening segments.

[0017] This disclosure provides a method for manufacturing a display panel, including:

[0018] Provide a driving substrate;

[0019] A thermoelectric cooling material layer is formed on the driving substrate. The thermoelectric cooling material layer is electrically connected to the driving substrate, and the thermoelectric cooling material layer has a plurality of pixel openings arranged in an array along the row direction and column direction.

[0020] The corresponding organic light-emitting material is dropped into the opening of each pixel and then cured.

[0021] During the curing process of the organic light-emitting material, the driving substrate provides a first target voltage to the thermoelectric cooling material layer. Under the action of the first target voltage, the thermoelectric cooling material layer is reduced to a first target temperature, so that the temperature at the edge of the organic light-emitting material is lower than the temperature at its center.

[0022] In one exemplary embodiment of this disclosure, during the curing process of the organic light-emitting material, the curing thickness at the center of the organic light-emitting material is detected;

[0023] When the cured thickness at the center of the organic light-emitting material is greater than or equal to the set thickness value, the supply of the first target voltage to the thermoelectric cooling material layer is stopped.

[0024] This disclosure provides a display device, the display device comprising:

[0025] The display panel as described in any of the above-mentioned examples;

[0026] A controller, connected to the driving substrate, is used to control the driving substrate to provide a first target voltage to the thermoelectric cooling material layer during the curing process of the organic light-emitting material.

[0027] In one exemplary embodiment of this disclosure, a temperature detector is also included, connected to the controller;

[0028] The temperature detector is used to detect the temperature of the display panel and transmit the temperature detection result to the controller. The controller can provide a second target voltage to the thermoelectric cooling material layer when the temperature of the display panel is greater than the set temperature value. The thermoelectric cooling material layer can be reduced to a second target temperature under the action of the second target voltage, so that the temperature of the display panel is less than or equal to the set temperature value.

[0029] The proposed solution has the following beneficial effects:

[0030] This disclosure utilizes the thermoelectric cooling material layer to reduce the temperature at the edge of the organic light-emitting material. This reduces the evaporation rate at the edge of the organic light-emitting material during the curing process, thereby decreasing the difference in evaporation rate between the center and the edge. This improves the problem of capillary flow from the center to the edge of the organic light-emitting material, reducing the possibility of the cured organic light-emitting material having a thicker edge and thinner center morphology, and improving the display quality of the display panel.

[0031] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0034] Figure 1 This is a schematic diagram of the process of curing organic light-emitting materials in the display panel without a thermoelectric cooling material layer in an embodiment of this disclosure.

[0035] Figure 2 This is a cross-sectional structural diagram of the display panel in an embodiment of this disclosure.

[0036] Figure 3 This is a schematic cross-sectional view of a pixel opening in an embodiment of this disclosure.

[0037] Figure 4 for Figure 3 A partially enlarged structural diagram.

[0038] Figure 5 This is a schematic diagram of another cross-sectional structure of the pixel opening in an embodiment of this disclosure.

[0039] Figure 6 for Figure 5 A partially enlarged structural diagram.

[0040] Figure 7 This is a flowchart illustrating the manufacturing method of the display panel in an embodiment of this disclosure.

[0041] Figure 8 This is a cross-sectional schematic diagram of a thermoelectric cooling material layer formed on a driving substrate according to an embodiment of the present disclosure.

[0042] Figure 9 for Figure 8 A top-view structural diagram.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Display panel;

[0045] 11. Driving substrate; 12. Display functional layer; 121. Thermoelectric cooling material layer; 1211. Pixel aperture; 122. Organic light-emitting material; 1221. Organic solvent; 1222. Organic solute;

[0046] X1, row direction; X2, column direction; Y, vertical direction. Detailed Implementation

[0047] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0048] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0049] The present disclosure will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0050] like Figure 1 As shown, during the fabrication of the display panel 1, when the organic light-emitting material 122 drips onto the driving substrate 11 and solidifies, the evaporation rate of the organic solvent 1221 at the edge of the organic light-emitting material 122 is greater than that at the center. To compensate for the loss of organic solvent 1221 at the edge, the organic light-emitting material 122 generates capillary flow from the center to the edge. As the organic solvent 1221 flows towards the edge, it also carries the organic solute 1222 to the edge, causing a large accumulation of organic solute 1222 at the edge. As a result, after solidification, the organic light-emitting material 122 will exhibit a coffee-colored ring shape that is thin at the center and thick at the edge. During the display process, the brightness at the edge of the organic light-emitting material 122 is greater than that at the center, which will cause abnormalities in the display image of the display panel 1.

[0051] To solve the above-mentioned technical problems, this disclosure provides a display panel 1, such as... Figure 2 As shown, the display panel 1 includes a driving substrate 11 and a display functional layer 12, with the display functional layer 12 formed on the driving substrate 11.

[0052] The display functional layer 12 includes a thermoelectric cooling material layer 121 and an organic light-emitting material 122. The thermoelectric cooling material layer 121 is electrically connected to the driving substrate 11. The thermoelectric cooling material layer 121 has a plurality of pixel openings 1211 arranged in an array along the row direction X1 and the column direction X2, and an organic light-emitting material 122 is formed in each pixel opening 1211.

[0053] Specifically, the driving substrate 11 can provide a first target voltage to the thermoelectric cooling material layer 121 during the curing process of the organic light-emitting material 122. Under the action of the first target voltage, the thermoelectric cooling material layer 121 can be reduced to a first target temperature, so that the temperature at the edge of the organic light-emitting material 122 is lower than the temperature at its center. This reduces the difference in evaporation rate between the center and the edge of the organic light-emitting material 122 and improves the problem of capillary flow from the center to the edge of the organic light-emitting material 122. This reduces the possibility of the cured organic light-emitting material 122 having a thicker edge and thinner center morphology and improves the display quality of the display panel. In addition, the thermoelectric cooling material layer 121 can also form a barrier between two adjacent organic light-emitting materials 122 to prevent the organic light-emitting materials 122 from flowing before curing, thereby avoiding the risk of crosstalk between the organic light-emitting materials 122.

[0054] It should be noted that when a first target voltage is applied to the thermoelectric cooling material layer 121, the surface temperature of the thermoelectric cooling material layer 121 can rapidly decrease to the first target temperature. Since the edges of the organic light-emitting material 122 are closer to the surface of the thermoelectric cooling material layer 121 than the center, when the temperature of the thermoelectric cooling material layer 121 decreases, the edges of the organic light-emitting material 122 are affected by the temperature change of the thermoelectric cooling material layer 121 before the center, resulting in a lower temperature at the edges than at the center. However, when the thermoelectric cooling material layer 121 remains at the first target temperature for an extended period, the temperature at the center of the organic light-emitting material 122 gradually decreases due to the low temperature effect of the thermoelectric cooling material layer 121, eventually aligning with the temperature at the edges.

[0055] To reduce the possibility of the cured organic light-emitting material 122 having a thick edge and thin center morphology, the present invention can apply a first target voltage to the thermoelectric cooling material layer 121 so that the temperature at the edge of the organic light-emitting material 122 is higher than the temperature at its center, while the center of the organic light-emitting material 122 reaches the curing condition.

[0056] It should be noted that the curing conditions mentioned above refer to the conditions under which the organic light-emitting material 122 transforms from a molten state to a solid state.

[0057] For example, the organic light-emitting material 122 in this embodiment can be a photocurable material, in which case the curing condition of the organic light-emitting material 122 is a light-curing condition; the organic light-emitting material 122 in this embodiment can also be a temperature-curing material, in which case the curing condition of the organic light-emitting material 122 is a temperature condition. However, it is not limited to these, the organic light-emitting material 122 can also be other materials besides photocurable materials and temperature-curing materials. Therefore, the curing conditions of the organic light-emitting material 122 can be controlled according to the type of organic light-emitting material 122.

[0058] Taking organic light-emitting material 122 as a photocurable material as an example, when organic light-emitting material 122 is irradiated, it can be transformed from a molten state to a solid state. In this embodiment, the organic light-emitting material 122 can be irradiated while a first target voltage is applied to the thermoelectric cooling material layer 121, causing it to gradually solidify under illumination. Because the temperature at the edge of the organic light-emitting material 122 is lower than its center temperature under the first target voltage, the energy required for solidification at the center of the organic light-emitting material 122 is less than that required at its edge. When the center and edge of the organic light-emitting material 122 are subjected to the same illumination conditions, the solidification rate at the center is greater than that at the edge. This improves the problem of capillary flow from the center to the edge in the organic light-emitting material 122, reducing the possibility of the solidified organic light-emitting material 122 having a thicker edge and thinner center morphology, and improving the display quality of the display panel 1.

[0059] However, it is not limited to this. The organic light-emitting material 122 can also be a temperature-curing material. When the first target voltage is applied to the thermoelectric cooling material layer 121, an additional temperature control device can be used to make the organic light-emitting material 122 reach the curable temperature condition. Since the temperature at the edge of the organic light-emitting material 122 is lower than that at its center under the action of the first target voltage, the center of the organic light-emitting material 122 can reach the curable temperature condition preferentially than its edge. That is, the center of the organic light-emitting material 122 can be cured preferentially than its edge. This can improve the problem of capillary flow from the center to the edge of the organic light-emitting material 122, reduce the possibility of the cured organic light-emitting material 122 having a shape that is thick at the edge and thin at the center, and improve the display quality of the display panel 1.

[0060] Specifically, the organic light-emitting material 122 in this embodiment may include a host organic molecule, a carrier organic molecule, and an additive. The host organic molecule may include at least one of the following structures: benzene ring, biphenyl ring, fluorene group, carbazole, fluorofluorene, etc. The host organic molecule can undergo processes such as charge transfer and fluorescence resonance to achieve light emission. The carrier organic molecule may include at least one of polyaromatic compounds and polyurethane. The carrier organic molecule can promote intermolecular interactions of the host organic molecule, improve luminescence efficiency, and also change the physical properties and thermal stability of the material. The additive may include at least one of metal complexes, organic acids, and organosilicon compounds. The additive can be used to change the charge carrier transport and energy level distribution of the material, adjust the wavelength of light emission, improve luminescence efficiency, and enhance the stability of the material.

[0061] In this embodiment of the disclosure, the range of the first target temperature can be -50℃ to 0℃. For example, the specific value of the first target temperature can be -50℃, -40℃, -30℃, -20℃, -10℃, 0℃, etc., which can be adjusted according to the actual situation.

[0062] It should be noted that, by avoiding a first target temperature below -50°C, the present embodiment can reduce the problems of long curing time and low curing efficiency of the organic light-emitting material 122 caused by excessively low temperature. Furthermore, by avoiding a first target temperature above 0°C, the severe coffee-ring morphology of the organic light-emitting material 122 caused by a small temperature difference between its edge and center can be reduced.

[0063] Furthermore, during the curing process of the organic light-emitting material 122, the driving substrate 11 can also stop providing the first target voltage to the thermoelectric cooling material layer 121 when the curing thickness at the center of the organic light-emitting material 122 reaches the set thickness value.

[0064] Among them, "curing thickness" refers to the film thickness of the organic solute 1222 solidified on the driving substrate 11 after the organic solvent 1221 in the organic light-emitting material 122 evaporates. The "thickness setting value" can be any value set by the tester for the curing thickness at the center of the organic light-emitting material 122.

[0065] For example, the thickness setting value can be greater than or equal to the average curing thickness of the fully cured organic light-emitting material 122. Thus, when the curing thickness at the center of the organic light-emitting material 122 reaches the thickness setting value and the first target voltage is stopped being supplied to the thermoelectric cooling material layer 121, the curing thickness at the center of the cured organic light-emitting material 122 can be greater than or greater than the curing thickness at its edge. This can reduce the possibility of the organic light-emitting material 122 exhibiting a coffee-ring morphology that is thin at the center and thick at the edges, and can improve the display quality of the display panel 1.

[0066] However, this is not the only limitation; the thickness setting value can also be less than the average cured thickness of the fully cured organic light-emitting material 122. Since the organic light-emitting material 122 may not be fully cured after the cured thickness at the center of the organic light-emitting material 122 reaches the thickness setting value and the first target voltage is stopped being supplied to the thermoelectric cooling material layer 121, before the organic light-emitting material 122 is fully cured, there is a possibility that some organic solute 1222 may move towards the center of the organic light-emitting material 122 to increase the cured thickness at the center of the organic light-emitting material 122. Therefore, if the thickness setting value is less than the average cured thickness of the fully cured organic light-emitting material 122, and it can be guaranteed that the cured thickness at the center of the organic light-emitting material 122 is greater than or equal to the cured thickness at its edge after the organic light-emitting material 122 is fully cured, this is also included in the scope of the embodiments disclosed herein.

[0067] Furthermore, in this embodiment, the time when the driving substrate 11 stops supplying power to the thermoelectric cooling material layer 121 can be controlled by predicting the size of the thickness setting value, so as to control the curing thickness at the center of the cured organic light-emitting material 122 to be the same as the curing thickness at its edge. That is, the organic light-emitting material 122 forms a structure with uniform film thickness. In the display state, the light emission brightness at the center of the organic light-emitting material 122 is the same as that at its edge, thereby improving the uniformity of the display brightness of the display panel 1.

[0068] Furthermore, in this embodiment, the driving substrate 11 can provide continuous or intermittent power to the thermoelectric cooling material layer 121. By controlling the power supply time of the driving substrate 11 to the thermoelectric cooling material layer 121, the degree of temperature controllability can be increased. While ensuring that the temperature at the edge of the organic light-emitting material 122 is lower than the temperature at its center, it is also possible to avoid the organic light-emitting material 122 being affected by the thermoelectric cooling material layer 121 for a long time, which would result in the temperature at the center of the organic light-emitting material 122 being too low. Consequently, during the manufacturing process of the display panel 1, the overall evaporation rate of the organic light-emitting material 122 would be slow, thus affecting the progress of subsequent processes.

[0069] For example, this disclosure can control the driving substrate 11 to intermittently supply power to the thermoelectric cooling material layer 121. That is, after the driving substrate 11 supplies power to the thermoelectric cooling material layer 121 for a certain period of time, the driving substrate 11 stops supplying power to the thermoelectric cooling material layer 121 to avoid the thermoelectric cooling material layer 121 cooling down for a long time, causing the temperature at the center of the organic light-emitting material 122 to become consistent with the temperature at its edge. After the power supply is stopped for a period of time, the driving substrate 11 supplies power to the thermoelectric cooling material layer 121 again so that the temperature at the edge of the organic light-emitting material 122 is lower than the temperature at its center.

[0070] In this embodiment, by providing a first target voltage to the organic light-emitting material 122 through the driving substrate 11, the curing rate at the center of the organic light-emitting material 122 can be ensured to be greater than that at its edge, thus avoiding capillary flow from the center to the edge of the organic light-emitting material 122 and the problem of a coffee-colored ring morphology. In addition, when the curing thickness at the center of the organic light-emitting material 122 reaches the set thickness value, the first target voltage is stopped from being provided to the thermoelectric cooling material layer 121, which can raise the temperature of the thermoelectric cooling material layer 121. After the curing thickness at the center of the organic light-emitting material 122 reaches the set thickness value, the curing rate at the edge of the organic light-emitting material 122 is accelerated, thereby improving the curing rate of the organic light-emitting material 122 and the manufacturing efficiency of the display panel 1, and reducing the energy consumption of the display panel 1, thereby reducing the manufacturing cost of the display panel 1.

[0071] During the display process of the display panel 1, when the temperature of the display panel 1 is greater than the temperature set value, the driving substrate 11 can also provide a second target voltage to the thermoelectric cooling material layer 121. The thermoelectric cooling material layer 121 can be reduced to the second target temperature under the action of the second target voltage, so that the temperature of the display panel 1 is less than or equal to the temperature set value.

[0072] It should be noted that the temperature of display panel 1 can refer to the actual operating temperature of display panel 1 during the display process, or the actual temperature of display panel 1 when it is not displaying. The "temperature setting value" can be any value set by the tester to the temperature of display panel 1, so as to ensure that the lifespan and normal display of display panel 1 will not be damaged under the temperature setting value.

[0073] It should be understood that when the temperature of the display panel 1 exceeds the set temperature, it can lead to a shortened lifespan or color shift issues. Furthermore, it can cause the organic light-emitting material 122 to decompose and break down under the influence of current, thereby weakening the light-emitting effect and significantly reducing the brightness of the display panel 1. In addition, prolonged operation of the display panel 1 in a high-temperature environment exceeding the set temperature can easily cause screen burn-in. For example, if certain areas of the display panel 1 display a fixed image or color for an extended period, the organic light-emitting material 122 in these areas may age at different rates, resulting in permanent image retention or discoloration of the display panel 1.

[0074] To avoid the above situation, the present invention can monitor the temperature of the display panel 1 in real time. When the temperature of the display panel 1 is greater than the set temperature value, the driving substrate 11 can provide a second target voltage to the thermoelectric cooling material layer 121. Under the action of the second target voltage, the thermoelectric cooling material layer 121 is reduced to the second target temperature, so that the temperature of the display panel 1 is less than or equal to the set temperature value. This ensures the display quality of the display panel 1 and extends the service life of the display panel 1.

[0075] In this embodiment of the disclosure, the second target voltage can be the same as the first target voltage, and the second target temperature can be the same as the first target temperature. Thus, a set of programs can be used to control the driving substrate 11 to provide the first target voltage and the second target voltage to the thermoelectric cooling material layer 121, thereby optimizing the algorithm of the control program and reducing the complexity of the drive.

[0076] However, this is not the only possibility. The second target voltage may also be different from the first target voltage, and the second target temperature may also be different from the first target temperature. As long as the thermoelectric cooling material layer 121 can make the temperature of the display panel 1 less than or equal to the temperature setting value at the second target temperature, so as to ensure the normal display of the display panel 1 and reduce the risk of the display panel 1's lifespan being reduced when it works in a high-temperature environment for a long time, it is included within the scope of this disclosure.

[0077] Specifically, the temperature setting range of the display panel 1 can be 0℃ to 35℃, and the second target temperature range can be -50℃ to 0℃. When the temperature of the display panel 1 is detected to exceed 35℃, the driving substrate 11 can apply the second target voltage to the thermoelectric cooling material layer 121 to reduce the surface temperature of the thermoelectric cooling material layer 121 to -50℃ to 0℃, and reduce the temperature of the display panel 1 to 0℃ to 35℃.

[0078] It should be noted that the display panel 1 in this embodiment can be used in vehicle display. When the temperature inside the vehicle rises and causes the temperature of the display panel 1 to exceed the set temperature range, or when the temperature of the display panel 1 rises during the display process and causes its temperature to exceed the set temperature range, a second target voltage can be provided to the thermoelectric cooling material layer 121 so that the thermoelectric cooling material layer 121 can be reduced to the second target temperature under the action of the second target voltage, and the temperature of the display panel 1 can be less than or equal to the set temperature.

[0079] In this embodiment of the present disclosure, the pixel opening 1211 may include a top end and a bottom end, with the top end of the pixel opening 1211 located on the side of the bottom end of the pixel opening 1211 away from the driving substrate 11.

[0080] Among them, such as Figure 2As shown, in some embodiments of this disclosure, the top area of ​​the pixel opening 1211 can be equal to the bottom area of ​​the pixel opening 1211, and the orthographic projection of the bottom of the pixel opening 1211 on the driving substrate 11 coincides with the orthographic projection of the top of the pixel opening 1211 on the driving substrate 11. In this case, the sidewall of the pixel opening 1211 can be set vertically or approximately perpendicular to the driving substrate 11. The overall structure of the pixel opening 1211 is simple and easy to realize through processes such as photolithography.

[0081] like Figures 3 to 6 As shown, in other embodiments of this disclosure, the top area of ​​the pixel opening 1211 can be larger than the bottom area of ​​the pixel opening 1211, and the orthographic projection of the bottom of the pixel opening 1211 on the driving substrate 11 is located within the orthographic projection of the top of the pixel opening 1211 on the driving substrate 11. At this time, at least a portion of the sidewall of the pixel opening 1211 is an inclined sidewall that is inclined relative to the vertical line of the driving substrate 11. The side of the inclined sidewall away from the driving substrate 11 is inclined in a direction away from the center of the pixel opening 1211. When the organic light-emitting material 122 contacts the inclined sidewall of the pixel opening 1211, the organic solute 1222 in the organic light-emitting material 122 flows toward the center of the pixel opening 1211 under the action of the inclined sidewall and gravity. This can reduce the possibility that the organic solute 1222 accumulates in large quantities at the edge of the organic light-emitting material 122 and causes the solidified organic light-emitting material 122 to exhibit a coffee-ring shape that is thin in the center and thick at the edge, thereby improving the display quality of the display panel 1.

[0082] For example, such as Figure 3 and Figure 4 As shown, the vertical cross-section of the pixel opening 1211 in this embodiment can be an isosceles trapezoid. In this case, the center of the organic light-emitting material 122 can be made to coincide with the axis of the pixel opening 1211. Thus, in any vertical cross-section of the pixel opening 1211, the contact area between the edge of the organic light-emitting material 122 and the two opposite sidewalls of the pixel opening 1211 is the same, thereby improving the temperature uniformity at the edge of the organic light-emitting material 122. This, in turn, improves the uniformity of the film thickness of the cured organic light-emitting material 122, thereby improving the uniformity of the display brightness of the display panel 1 and the display effect of the display panel 1.

[0083] However, it is not limited to this. The vertical cross section of pixel opening 1211 can also be a right trapezoid or other trapezoids besides isosceles trapezoids, depending on the actual situation.

[0084] Furthermore, the sidewall of the pixel opening 1211 can be a plane or a curved surface. For example, the pixel opening 1211 can be in the shape of a frustum, a truncated cone, etc., without any specific restrictions.

[0085] It should be noted that the vertical section refers to the section cut along the vertical direction Y through the pixel opening 1211, and the vertical direction Y refers to the direction that is perpendicular or approximately perpendicular to the driving substrate 11.

[0086] In addition, such as Figure 5 and Figure 6 As shown, the pixel opening 1211 may also include multiple opening segments arranged sequentially in the vertical direction Y and coaxial. Each opening segment has a top and a bottom end. The top end of the opening segment is located on the side of the bottom end of the opening segment away from the driving substrate 11. The top area of ​​each opening segment is greater than or equal to its bottom area. Along the direction away from the driving substrate 11, the maximum area of ​​the multiple opening segments increases sequentially, and a stepped surface is formed at the junction of adjacent opening segments. Specifically, in two adjacent opening segments, the bottom end of one opening segment connects to the top end of another opening segment, and the bottom area of ​​the opening segment away from the driving substrate 11 is greater than the top area of ​​the opening segment closer to the driving substrate 11.

[0087] For example, each opening segment can be configured as a cuboid with a different top area. When multiple opening segments are arranged sequentially in the vertical direction Y, the top area of ​​the opening segments increases along the vertical direction Y from the driving substrate 11 to the display functional layer 12. In two adjacent opening segments, the bottom end of one opening segment is connected to the top end of another adjacent opening segment, and the area of ​​the bottom end is larger than the area of ​​the top end connected to it. Moreover, the orthographic projection of the top end on the driving substrate 11 is located within the orthographic projection of the bottom end connected to it on the driving substrate 11. At this time, the pixel opening 1211 can present an inverted stepped shape.

[0088] However, it is not limited to this. The opening segment can also be a cube, triangular prism, cylinder and other shapes other than a cuboid. In addition, in the same pixel opening 1211, the axes of multiple opening segments arranged in the vertical Y direction can also be different. No specific restrictions are imposed here.

[0089] In this embodiment, by setting the pixel opening 1211 in an inverted stepped shape, the contact surface between the edge of the organic light-emitting material 122 and the thermoelectric cooling material layer 121 can be increased, thereby slowing down the evaporation rate of the organic light-emitting material 122 at more edges and increasing the difference between the evaporation rate at the center of the organic light-emitting material 122 and the evaporation rate at its edges, thereby reducing the possibility of the organic light-emitting material 122 exhibiting a coffee-colored ring morphology, and thus improving the display quality of the display panel 1.

[0090] refer to Figures 7 to 9 As shown, this disclosure provides a method for manufacturing a display panel 1, including:

[0091] S1. A driving substrate 11 is provided.

[0092] S2. A thermoelectric cooling material layer 121 is formed on the driving substrate 11. The thermoelectric cooling material layer 121 is electrically connected to the driving substrate 11, and the thermoelectric cooling material layer 121 has a plurality of pixel openings 1211 arranged in an array along the row direction X1 and the column direction X2.

[0093] S3. Drop the corresponding organic light-emitting material 122 into the opening 1211 of each pixel, and cure the organic light-emitting material 122.

[0094] Specifically, a thermoelectric cooling material layer 121 can be first coated on the driving substrate 11 to form the thermoelectric cooling material layer 121. The material of the thermoelectric cooling material layer 121 in this embodiment may include at least one of bismuth telluride, sodium bismuth titanate-based ceramic material, barium strontium titanate, barium strontium niobate ceramic, barium strontium zirconate titanate ceramic, silver niobate ceramic, and sodium bismuth titanate-based thin film, thereby enabling the thermoelectric cooling material layer 121 to reduce its temperature under the drive of the voltage applied to the driving substrate 11.

[0095] Furthermore, such as Figure 8 and Figure 9 As shown, a plurality of pixel openings 1211 arranged in an array in the row direction X1 and column direction X2 can be formed by etching the thermoelectric cooling material layer 121. Then, organic light-emitting material 122 is dropped into each pixel opening 1211. The method of dropping organic light-emitting material 122 into the pixel opening 1211 can be inkjet printing, that is, the nozzle containing organic light-emitting material 122 is positioned directly in front of each pixel opening 1211 so that the organic light-emitting material 122 drops into the pixel opening 1211. However, it is not limited to this. Organic light-emitting material 122 can also be dropped into the pixel opening 1211 by other solution methods, depending on the actual situation.

[0096] In this embodiment of the present disclosure, an electrical connection is formed between the thermoelectric cooling material layer 121 and the driving substrate 11, so that the driving substrate 11 can provide voltage to the thermoelectric cooling material layer 121 to reduce the temperature of the thermoelectric cooling material layer 121.

[0097] Specifically, during the curing process of the organic light-emitting material 122, the driving substrate 11 provides a first target voltage to the thermoelectric cooling material layer 121 to cool the thermoelectric cooling material layer 121 to a first target temperature, and makes the temperature at the edge of the organic light-emitting material 122 lower than the temperature at its center. As a result, the evaporation rate at the center of the organic light-emitting material 122 is greater than the evaporation rate at its edge, which can prevent the organic light-emitting material 122 from generating capillary flow from the center to the edge, causing a large amount of organic solute 1222 to accumulate at the edge of the organic light-emitting material 122. This reduces the possibility of the organic light-emitting material 122 curing into a shape that is thin at the center and thick at the edge, thereby improving the display quality of the display panel 1.

[0098] It should be noted that the driving substrate 11 can provide a first target voltage to the thermoelectric cooling material layer 121 before the organic light-emitting material 122 is dropped into the pixel opening 1211, so as to pre-cool the thermoelectric cooling material layer 121 and stabilize it at the first target temperature. When the organic light-emitting material 122 is dropped into the pixel opening 1211, the edge of the organic light-emitting material 122 can be rapidly cooled by the low temperature of the thermoelectric cooling material layer 121, thereby improving the manufacturing efficiency of the display panel 1. However, it is not limited to this. The driving substrate 11 can also provide the first target voltage to the thermoelectric cooling material layer 121 after the organic light-emitting material 122 is dropped into the pixel opening 1211, so as to shorten the time for the driving substrate 11 to provide the first target voltage to the thermoelectric cooling material layer 121, thereby reducing energy consumption and reducing the manufacturing cost of the display panel 1.

[0099] Furthermore, the manufacturing method of the display panel 1 may also include: during the curing process of the organic light-emitting material 122, detecting the curing thickness at the center of the organic light-emitting material 122; when the curing thickness at the center of the organic light-emitting material 122 is greater than or equal to the thickness set value, stopping the supply of the first target voltage to the thermoelectric cooling material layer 121.

[0100] In this embodiment, when the driving substrate 11 provides a first target voltage to the thermoelectric cooling material layer 121, the curing thickness at the center of the organic light-emitting material 122 during the curing process is measured. When the curing thickness at the center of the organic light-emitting material 122 is greater than or equal to a set thickness value, the supply of the first target voltage to the thermoelectric cooling material layer 121 is stopped. This ensures that the thickness at the center of the fully cured organic light-emitting material 122 is greater than or equal to the thickness at its edge, reducing the possibility of the organic light-emitting material 122 exhibiting a coffee-ring morphology. Simultaneously, it reduces the power supply time to the thermoelectric cooling material layer 121, thereby reducing the energy loss of the driving substrate 11 and thus lowering the manufacturing cost of the display panel 1. Furthermore, after the driving substrate 11 stops supplying power to the thermoelectric cooling material layer 121, the temperature of the thermoelectric cooling material layer 121 rises, and the temperature at the edge of the organic light-emitting material 122 increases, thereby accelerating the overall curing rate of the organic light-emitting material 122 and improving the manufacturing efficiency of the display panel 1.

[0101] In addition, the manufacturing method of the display panel 1 may also include: S4, during the curing process of the organic light-emitting material 122, a first target voltage is provided to the thermoelectric cooling material layer 121 by the driving substrate 11, and the thermoelectric cooling material layer 121 is reduced to a first target temperature under the action of the first target voltage, so that the temperature at the edge of the organic light-emitting material 122 is lower than the temperature at its center.

[0102] To prevent the display panel 1 from experiencing shortened lifespan, decreased brightness, color shift, or burn-in when its temperature exceeds the set temperature, this embodiment of the present disclosure can monitor the temperature of the display panel 1 in real time. When the temperature of the display panel 1 exceeds the set temperature, the driving substrate 11 can apply a second target voltage to the thermoelectric cooling material layer 121 to cool the thermoelectric cooling material layer 121 to the second target temperature, and make the temperature of the display panel 1 less than or equal to the set temperature.

[0103] This disclosure provides a display device, which includes a controller and any of the display panels 1 described above. The controller is connected to a driving substrate 11 and is used to control the driving substrate 11 to apply a first target voltage to the thermoelectric cooling material layer 121 during the curing process of the organic light-emitting material 122.

[0104] Furthermore, the display device in this embodiment may also include a temperature detector, which is connected to a controller to detect the temperature of the display panel 1 and transmit the detection result to the controller in real time. The controller can control the drive substrate 11 to supply or de-energize the thermoelectric cooling material layer 121 according to the received detection result.

[0105] Specifically, when the temperature detector detects that the temperature of the display panel 1 is higher than the set temperature value, the controller can control the driving substrate 11 to provide a second target voltage to the thermoelectric cooling material layer 121. Under the action of the second target voltage, the thermoelectric cooling material layer 121 cools down to the second target temperature, and the temperature of the display panel 1 is lower than or equal to the set temperature value. When the temperature detector detects that the temperature of the organic light-emitting material 122 is lower than or equal to the set temperature value, the controller can control the driving substrate 11 to stop providing voltage to the thermoelectric cooling material layer 121.

[0106] The display device in this embodiment may further include a curing thickness detector. The curing thickness detector can be used to detect the curing thickness at the center of the organic light-emitting material 122 during the curing process in real time, and transmit the detection result to the controller in real time. The controller can control the driving substrate 11 to supply or de-supply the thermoelectric cooling material layer 121 based on the received curing thickness at the center of the organic light-emitting material 122. Specifically, before the curing thickness at the center of the organic light-emitting material 122 reaches a set thickness value, the controller can control the driving substrate 11 to provide a first target voltage to the thermoelectric cooling material layer 121. When the curing thickness at the center of the organic light-emitting material 122 reaches the set thickness value, the controller can control the driving substrate 11 to stop supplying voltage to the thermoelectric cooling material layer 121.

[0107] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise expressly specified.

[0108] It should be noted that terms such as "upper" and "lower" are used only for distinction and convenience of description, and do not impose any positional limitation on the embodiments of the present invention. In this disclosure, unless otherwise explicitly specified and limited, the term "connection" and other such terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0109] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure. Therefore, any changes or modifications made in accordance with the claims and description of the present disclosure should fall within the scope of the patent coverage of the present disclosure.

Claims

1. A display panel, characterized in that, include: Drive substrate; A display functional layer is formed on the driving substrate. The display functional layer includes a thermoelectric cooling material layer and an organic light-emitting material. The thermoelectric cooling material layer has a plurality of pixel openings arranged in an array along the row and column directions. The thermoelectric cooling material layer is electrically connected to the driving substrate, and the organic light-emitting material is formed in each pixel opening. The driving substrate is capable of providing a first target voltage to the thermoelectric cooling material layer during the curing process of the organic light-emitting material, and the thermoelectric cooling material layer is capable of being reduced to a first target temperature under the action of the first target voltage, so that the temperature at the edge of the organic light-emitting material is lower than the temperature at its center.

2. The display panel according to claim 1, characterized in that, During the curing process of the organic light-emitting material: the driving substrate can also stop providing the first target voltage to the thermoelectric cooling material layer when the curing thickness at the center of the organic light-emitting material reaches the set thickness value.

3. The display panel according to claim 1, characterized in that, The driving substrate can also provide a second target voltage to the thermoelectric cooling material layer when the temperature of the display panel is greater than the set temperature value. The thermoelectric cooling material layer can be reduced to a second target temperature under the action of the second target voltage, so that the temperature of the display panel is less than or equal to the set temperature value.

4. The display panel according to claim 3, characterized in that, The first target voltage is the same as the second target voltage, and the first target temperature is the same as the second target temperature; and / or The first target temperature range is -50℃ to 0℃, and the second target temperature range is -50℃ to 0℃; and / or The thermoelectric cooling material layer is made of at least one of the following: bismuth telluride, sodium bismuth titanate-based ceramic material, barium strontium titanate, barium strontium niobate ceramic, barium strontium zirconate titanate ceramic, silver niobate ceramic, and sodium bismuth titanate-based thin film.

5. The display panel according to claim 1, characterized in that, The top area of ​​the pixel opening is larger than the bottom area of ​​the pixel opening, and the orthographic projection of the bottom of the pixel opening on the driving substrate is located within the orthographic projection of the top of the pixel opening on the driving substrate.

6. The display panel according to claim 5, characterized in that, The vertical cross-section of the pixel opening is an isosceles trapezoid; or The pixel opening includes multiple opening segments arranged sequentially in the vertical direction and coaxial, wherein the top area of ​​the opening segment is greater than or equal to the bottom area of ​​the opening segment. In this case, along the direction away from the driving substrate, the maximum area of ​​the multiple opening segments increases sequentially, and a stepped surface is formed at the junction of adjacent opening segments.

7. A method for manufacturing a display panel, characterized in that, include: Provide a driving substrate; A thermoelectric cooling material layer is formed on the driving substrate. The thermoelectric cooling material layer is electrically connected to the driving substrate, and the thermoelectric cooling material layer has a plurality of pixel openings arranged in an array along the row direction and column direction. The corresponding organic light-emitting material is dropped into the opening of each pixel and then cured. During the curing process of the organic light-emitting material, the driving substrate provides a first target voltage to the thermoelectric cooling material layer. Under the action of the first target voltage, the thermoelectric cooling material layer is reduced to a first target temperature, so that the temperature at the edge of the organic light-emitting material is lower than the temperature at its center.

8. The method for manufacturing a display panel according to claim 7, characterized in that, During the curing process of the organic light-emitting material, the curing thickness at the center of the organic light-emitting material is detected; When the cured thickness at the center of the organic light-emitting material is greater than or equal to the set thickness value, the supply of the first target voltage to the thermoelectric cooling material layer is stopped.

9. A display device, characterized in that, The display device includes: The display panel as described in any one of claims 1 to 6; A controller, connected to the driving substrate, is used to control the driving substrate to provide a first target voltage to the thermoelectric cooling material layer during the curing process of the organic light-emitting material.

10. The display device according to claim 9, characterized in that, It also includes a temperature detector, which is connected to the controller; The temperature detector is used to detect the temperature of the display panel and transmit the temperature detection result to the controller. The controller can provide a second target voltage to the thermoelectric cooling material layer when the temperature of the display panel is greater than the set temperature value. The thermoelectric cooling material layer can be reduced to a second target temperature under the action of the second target voltage, so that the temperature of the display panel is less than or equal to the set temperature value.

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