Display panel and display device

Abstract

The invention provides a display panel and a display device. The display panel is provided with a display area and a non-display area. The display panel comprises a substrate and a pixel defining layer, and a plurality of light-emitting units are arranged on the pixel defining layer in an array mode. At least part of the refrigeration pattern is arranged in the display area; the refrigeration pattern and the pixel defining layer are arranged on the same side of the substrate, the orthographic projection of the refrigeration pattern on the substrate is located in the orthographic projection of the pixel defining layer on the substrate, and the orthographic projection of the refrigeration pattern on the substrate does not coincide with the orthographic projection of the light-emitting unit on the substrate; the refrigeration pattern is provided with a current input part and a current output part, and the refrigeration pattern is electrically connected with the first wire and the second wire through the current output part and the current input part; heat in the display panel can be conducted out and dissipated in time through the refrigeration pattern, the quality of the display panel can be improved, and the service life of the display panel is prolonged.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] OLED (Organic Light-Emitting Diode) display device is a self-luminous display structure. Compared with LCD (Liquid Crystal Display), it has the characteristics of high contrast, wide viewing angle, bright colors and relative lightness and thinness. It is more suitable for application in display devices with various forms such as bending and curling. OLED display device is composed of multiple self-luminous light-emitting units. During the display process, the light-emitting unit will generate heat, and there is a thermal superposition effect between the multiple light-emitting units, which makes it difficult for the heat of the light-emitting unit to be effectively dissipated, which easily causes local temperature rise. The light-emitting unit that is in a high-temperature working state for a long time will not only affect the overall display effect of the display panel, but also accelerate the aging speed of the light-emitting unit material, shorten the service life of the light-emitting unit, and affect the overall quality of the display panel. Summary of the invention

[0003] In view of this, the present application aims to provide a display panel and a display device, which are used to solve some or all of the technical problems mentioned in the background technology.

[0004] Based on the above purpose, the present application provides a display panel, wherein the display panel has a display area and a non-display area surrounding the display area; the display panel comprises:

[0005] substrate substrate;

[0006] A pixel defining layer is arranged on one side of the base substrate and is located in the display area; a plurality of light-emitting units are arranged in an array on the pixel defining layer;

[0007] A cooling pattern, at least a portion of which is disposed in the display area; the cooling pattern and the pixel defining layer are disposed on the same side of the base substrate, the orthographic projection of the cooling pattern on the base substrate is located within the orthographic projection of the pixel defining layer on the base substrate, and the orthographic projection of the cooling pattern on the base substrate does not overlap with the orthographic projection of the light-emitting unit on the base substrate;

[0008] A first routing line and a second routing line, a current input part and a current output part are respectively provided on both sides of the cooling pattern, the first routing line is electrically connected to the cooling pattern through the current input part, and the cooling pattern is electrically connected to the second routing line through the current output part.

[0009] Based on the same inventive concept, the present application also provides a display device, comprising the display panel as described above.

[0010] From the above description, it can be seen that the display panel and the display device provided by the present application form a cooling circuit structure through the first routing, the cooling pattern and the second routing; when the current flows through the first routing, the current input part of the cooling pattern, the cooling pattern, the current output part of the cooling pattern and the second routing in sequence, the current input part and the cooling pattern can absorb the heat generated by the light-emitting unit in the display area, thereby realizing cooling and lowering the temperature of the display area; at the same time, the cooling circuit structure can also release the heat through the current output part and the second routing to avoid heat accumulation in the display area, which is beneficial to delaying the aging speed of the light-emitting unit, improving the overall quality of the display panel, and extending the service life of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a structural schematic diagram of a display panel in the related art;

[0013] Figure 2 This is a schematic diagram of the structure of the first display panel of the present application;

[0014] Figure 3 This is a schematic diagram of the structure of the second display panel of the present application;

[0015] Figure 4 This is a schematic diagram of the structure of the third display panel of the present application;

[0016] Figure 5 This is a schematic diagram of the structure of the fourth display panel of the present application;

[0017] Figure 6 This is a schematic diagram of the structure of the fifth display panel of the present application;

[0018] Fig. 7A and Figure 7B They are respectively the brightness change curves of the blue light-emitting layer and the green light-emitting layer of the present application at 85°C;

[0019] Fig. 8A and Figure 8B They are respectively the brightness change curves of the blue light-emitting layer and the green light-emitting layer of the present application at 25°C;

[0020] Fig. 9 This is a schematic diagram of the distribution of the cooling pattern in the pixel definition layer of the present application;

[0021] Figure 10A-10C for Fig. 9 The preparation flow chart of the pixel definition layer in the figure;

[0022] Fig.11 This is a schematic diagram of the distribution of the cooling pattern between the pixel definition layer and the packaging layer of the present application;

[0023] Fig.12 This is a schematic diagram of the distribution of the cooling pattern in the packaging layer of this application;

[0024] Fig.13 This is a schematic diagram of the connection between the cooling pattern and the second wiring in this application.

[0025] Description of reference numerals:

[0026] AA, display area; NA, non-display area;

[0027] 100, substrate; 101, via;

[0028] 200, pixel defining layer; 201, light emitting unit; 201a, blue light emitting layer; 201b, green light emitting layer; 201c, red light emitting layer; 210, first defining portion; 211, groove portion; 220, second defining portion;

[0029] 300, cooling pattern; 301, cooling wiring; 310, current input part; 320, current output part;

[0030] 410, first routing; 420, second routing;

[0031] 500, thermal conductive layer;

[0032] 600. Encapsulation layer. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0036] With the continuous advancement of display technology, OLED display devices have gradually become key components in mainstream display devices due to their unique self-luminous characteristics, ultra-thin design, high contrast, wide viewing angle and bright color performance. Compared with LCD display device technology, OLED, in addition to the aforementioned advantages, can also achieve more flexible and changeable screen forms such as folding, bending and even curling, and is suitable for more fields. Although OLED display technology has many advantages, it still has shortcomings. As for OLED display panels, their short service life and high difficulty in quality control are key obstacles restricting their widespread application. Figure 1 As shown, the OLED display panel has sub-pixels formed by multiple light-emitting units 201 of different colors (including a blue light-emitting layer 201a, a green light-emitting layer 201b and a red light-emitting layer 201c, etc.). In the early stage of the application of the display panel, due to the different aging rates of sub-pixel materials of different colors, some pixels will age prematurely when the display panel displays static images for a long time, which can easily cause the display panel to have a burn-in problem; in addition, the aging rate and service life of the light-emitting units 201 of different colors are different. With the continuous use of the OLED display device, the light-emitting layers of different colors will show obvious performance degradation over time, which will cause the display panel to have a problem of image retention during the display process, especially in a high temperature environment, the performance degradation rate of the light-emitting unit 201 is accelerated, which further limits its application scope.

[0037] More specifically, the service life of an OLED display panel is closely related to its working environment temperature and display brightness, that is, an increase in the ambient temperature and an increase in the display brightness will both lead to a significant shortening of the service life of the OLED display panel; in some cases, since the OLED display panel is composed of a substrate 100, a pixel defining layer 200, and light-emitting units 201 regularly arranged in the pixel defining layer 200, the heat generation effect of the light-emitting unit 201 is relatively obvious, especially when the input current is large, the display brightness of the light-emitting unit 201 is enhanced, which will not only lead to an accelerated decomposition rate of the material forming the light-emitting unit 201, but also a sharp increase in the heat released by the energy level transition of the light-emitting unit 201, thereby causing the temperature of the light-emitting unit 201 to rise; in addition, due to the thermal superposition effect of adjacent light-emitting units 201, it is difficult for the heat generated by multiple light-emitting units 201 to be effectively dissipated, thereby causing the local temperature of the display panel to rise; the light-emitting unit 201 is in a high-temperature working state for a long time, which will not only affect the overall display effect of the display panel, but also further accelerate the aging rate of the light-emitting unit 201, thereby shortening the service life of the light-emitting unit 201 and reducing the overall quality of the display panel.

[0038] In view of this, the present application provides a display panel, the display panel having a display area AA and a non-display area NA surrounding the display area AA; the display panel comprises a base substrate 100, a pixel defining layer 200, a cooling pattern 300, a first wiring 410 and a second wiring 420; the pixel defining layer 200 is arranged on one side of the base substrate 100 and is located in the display area AA; the pixel defining layer 200 is arrayed with a plurality of light-emitting units 201; at least a portion of the cooling pattern 300 is arranged in the display area AA; the cooling pattern 300 and the pixel defining layer 200 are arranged On the same side of the base substrate 100, the orthographic projection of the cooling pattern 300 on the base substrate 100 is located within the orthographic projection of the pixel defining layer 200 on the base substrate 100, and the orthographic projection of the cooling pattern 300 on the base substrate 100 does not overlap with the orthographic projection of the light-emitting unit 201 on the base substrate 100; a current input part 310 and a current output part 320 are respectively provided on both sides of the cooling pattern 300, the first wiring 410 is electrically connected to the cooling pattern 300 through the current input part 310, and the cooling pattern 300 is electrically connected to the second wiring 420 through the current output part 320.

[0039] The present application provides a display panel with good heat dissipation efficiency, such as Figure 2-Figure 13As shown, the display panel has a display area AA and a non-display area NA arranged around the display area AA; as for the display area AA and the non-display area NA, the display area AA is a part for presenting visual information such as images, texts and videos, so that the user can use the display area AA to intuitively obtain the display content; the non-display area NA is a border area arranged around the display area AA, located at the edge area of ​​the display panel, and is mainly used to encapsulate and protect the display panel to prevent the display panel from having problems such as light leakage. Since the edge part of the display panel is shielded by the non-display area NA, the overall refinement of the display panel can be improved.

[0040] As for the display panel, the display panel may include a base substrate 100 and a pixel defining layer 200, wherein the pixel defining layer 200 is arrayed with a plurality of light emitting units 201; Figure 2-Figure 6 as well as Fig. 9 As shown, the base substrate 100 can be used as the bearing body of the display panel, and is used to support and protect the pixel defining layer 200 and multiple light-emitting units 201; the pixel defining layer 200 is arranged on one side of the base substrate 100 and multiple pixel openings are distributed in an array, and multiple light-emitting units 201 are arranged in an array on the pixel defining layer 200, and each light-emitting corresponds to a pixel opening, so that the multiple light-emitting units 201 can emit light toward a side away from the base substrate 100; wherein, the base substrate 100 can be formed of materials such as polyimide, optical quartz and nano-ceramics, and the pixel defining layer 200 can be formed of organic insulating materials such as polyimide, polyphthalimide, polyphthalamide, acrylic resin, benzocyclobutene or phenolic resin; in addition, a spacer (not marked in the figure) for increasing the interlayer adhesion ability can also be set on the side of the pixel defining layer 200 away from the base substrate 100, and the material of the spacer can be the same as the material of the pixel defining layer 200.

[0041] For display panels, Figure 2-Figure 6 , Fig. 9 as well as Figure 11-13As shown, the display panel further includes a cooling pattern 300, a first wiring 410 and a second wiring 420; as for the cooling pattern 300, at least a portion of the cooling pattern 300 is disposed in the display area AA, and the portion of the cooling pattern 300 and the pixel defining layer 200 are disposed on the same side of the base substrate 100, so that the light emitting units 201 arrayed on the pixel defining layer 200 are cooled by the cooling pattern 300 to reduce the overall temperature of the display area AA; more specifically, when the display panel is in a display state, the light emitting units 201 in the display panel are lit and generate heat, and since the positive projection of the cooling pattern 300 on the base substrate 100 is located at the pixel defining layer 200 on the base substrate The cooling pattern 300 is within the orthographic projection of the substrate 100, and the orthographic projection of the cooling pattern 300 on the substrate 100 does not overlap with the orthographic projection of the light-emitting unit 201 on the substrate 100. Therefore, for any light-emitting unit 201, the cooling pattern 300 is located beside the light-emitting unit 201 and can at least partially surround the light-emitting unit 201. The cooling effect of the cooling pattern 300 can be used to cool down the multiple light-emitting units 201 in the display area AA, so as to avoid the light-emitting units 201 in the display area AA being in a high temperature state for a long time and accelerating the aging speed of the materials of the light-emitting units 201, which is beneficial to prolonging the service life of the light-emitting units 201 and improving the display effect and overall quality of the display panel.

[0042] In addition, for the cooling pattern 300, the cooling pattern 300 is further provided with a current input portion 310 and a current output portion 320; Figure 2-Figure 6As shown, the current input portion 310 can be arranged on one side of the cooling pattern 300, and the current output portion 320 corresponding to the current input portion 310 is located on the other side of the cooling pattern 300, and the two sides are arranged oppositely; for the current input portion 310 and the current output portion 320 of the cooling wiring 301, the first wiring 410 is electrically connected to the cooling pattern 300 through the current input portion 310, and the second wiring 420 is electrically connected to the cooling pattern 300 through the current output portion 320, so that a cooling circuit structure is formed between the first wiring 410, the cooling pattern 300 and the second wiring 420. When the display area AA is cooled by using the cooling circuit structure, the current in the first wiring 410 can flow into the cooling pattern 300 through the current input portion 310 of the cooling pattern 300. The cooling pattern 300 is provided, and flows into the second wiring 420 through the current output part 320 of the cooling pattern 300. As the current flows through the first wiring 410, the current input part 310 of the cooling pattern 300, the cooling pattern 300, the current output part 320 of the cooling pattern 300 and the second wiring 420 in sequence, the cooling pattern 300 can have a cooling effect in the display area AA, so that the heat generated by the light-emitting unit 201 is absorbed by the cooling pattern 300, and the heat is released through the current output part 320 and the second wiring 420, thereby achieving the effect of cooling and dissipating the display area AA, avoiding heat accumulation in the display area AA, and helping to reduce the aging speed of the light-emitting unit 201, and improving the overall quality and service life of the display panel.

[0043] In addition, with regard to the cooling pattern 300, the orthographic projection of the cooling pattern 300 on the base substrate 100 is located within the orthographic projection of the pixel defining layer 200 on the base substrate 100, and the cooling pattern 300 can be shielded by the pixel defining layer 200 to prevent the cooling pattern 300 from interfering with its light emitting effect; at the same time, the orthographic projection of the cooling pattern 300 on the base substrate 100 does not overlap with the orthographic projection of the light emitting unit 201 on the base substrate 100, thereby avoiding the cooling pattern 300 from shielding the light emitting unit 201, thereby improving the display light efficiency of the display panel.

[0044] In some embodiments, the cooling pattern 300 is formed of a P-type semiconductor material, and the first trace 410 and the second trace 420 are both formed of an N-type semiconductor material.

[0045] As for the display panel, the cooling pattern 300, the first wiring 410 and the second wiring 420 in the display panel can constitute a cooling circuit structure and be connected to an external power supply. When the cooling circuit structure is turned on, the cooling pattern 300 in the cooling circuit structure absorbs the heat generated by the light-emitting unit 201, thereby achieving a cooling effect on the display area AA; at the same time, the heat can be released in time by using the second wiring 420, which can prevent the heat from accumulating in the display area AA and causing the temperature of the display area AA to be too high; wherein, the cooling pattern 300 is formed by using a P-type semiconductor material, and the first wiring 410 and the second wiring 420 are formed by using an N-type semiconductor material, when the cooling pattern 300 is electrically connected to the first wiring 410 through the current input part 310, and is electrically connected to the second wiring 420 through the current output part 320, when the external power supply provides electrical energy, so that the current The current flows through the first wiring 410, the current input part 310 of the cooling pattern 300, the cooling pattern 300, the current output part 320 of the cooling pattern 300 and the second wiring 420 in sequence, and causes the circuit to generate a thermoelectric effect (i.e., the Peltier effect), that is, when powered on, the current input part 310 can be used as a cooling node for cooling and can absorb heat, and the current output part 320 can be used as a heating node for heating and can release heat. For the cooling pattern 300, since there is a temperature gradient between the cooling pattern 300 and the current input part 310, heat can be transferred to the current input part 310 through the cooling pattern 300, so that the heat is absorbed by the current input part 310, thereby cooling the light-emitting unit 201 in the display area AA, and the current output part 320 connected to the second wiring 420 through the cooling wiring 301 releases heat.

[0046] In combination with the above-mentioned embodiment, the cooling effect of the cooling pattern 300 is further explained; specifically, when the cooling circuit structure is connected to the external power supply, the external power supply can provide current to the first wiring 410, and the current flows into the cooling pattern 300 through the current input part 310. For the cooling circuit structure, the cooling pattern 300 is formed by P-type semiconductor material, the first wiring 410 and the second wiring 420 are both formed by N-type material, and the current input part 310 is used as a connection node between the P-type semiconductor material and the N-type semiconductor material. Since the N-type semiconductor material mainly uses electrons as carriers and the P-type semiconductor material mainly uses holes as carriers, when the current flows from the first wiring 410 formed by the N-type semiconductor material to the P-type The cooling pattern 300 formed by the semiconductor material needs to overcome the energy level difference in the process of electrons migrating from the N-type semiconductor material to the P-type semiconductor material when flowing through the connection node between the two, that is, when flowing through the current input part 310, and needs to use the current input part 310 to absorb heat, that is, the heat of the cooling pattern 300 connected to the current input part 310, so that the temperature of the cooling pattern 300 is reduced and a heating node is formed. Since the light-emitting unit 201 in the display area AA generates heat during the display process, the cooling pattern 300 with a lower temperature can be used to cool the display area AA to absorb the heat generated by the light-emitting unit 201 and transfer it to the current input part 310, thereby reducing the temperature of the display area AA.

[0047] In addition, when the current flows from the cooling pattern 300 formed by the P-type semiconductor material to the first wiring 410 formed by the N-type semiconductor material, when the current flows through the connection node between the two, that is, when the current output part 320, there is an energy level difference in the process of electrons migrating from the P-type semiconductor material to the N-type semiconductor material, and it is necessary to use the current input part 310 to release heat, that is, the cooling circuit structure releases the heat to avoid heat accumulation in the cooling circuit structure and avoid the problem of excessive temperature in the display area AA.

[0048] It should be noted that, in the display panel, the cooling circuit structure is composed of a cooling pattern 300 formed of an N-type semiconductor material, and a first wiring 410 and a second wiring 420 formed of a P-type semiconductor material, which meet the cooling requirements of the display panel; since the cooling circuit structure does not require additional moving parts, it has low noise and high reliability, and avoids excessive vibration of the display panel affecting the normal use of the display panel.

[0049] In some embodiments, the display panel also includes a heat conductive layer 500 , and the heat conductive layer 500 and the second wiring 420 are arranged on the same side of the base substrate 100 ; the orthographic projections of the second wiring 420 and the current output portion 320 on the base substrate 100 are both located at the orthographic projection of the heat conductive layer 500 on the base substrate 100 .

[0050] As for the display panel, when an external power source is used to provide current to the cooling circuit structure composed of the cooling pattern 300, the first wiring 410 and the second wiring 420 and cool the display area AA, due to the temperature gradient of the cooling pattern 300, the heat generated by the light-emitting unit 201 can be transferred to the connection node between the first wiring 410 and the cooling pattern 300, that is, the current input part 310, through the cooling pattern 300. When the current flows from the first wiring 410 to the cooling pattern 300 and passes through the current input part 310, the current input part 310 will absorb heat to overcome the energy level difference, thereby achieving the purpose of using the cooling pattern 300 to cool the display area AA; at the same time, when the cooling circuit structure uses the current input part 310 for cooling, the cooling circuit structure also releases heat through the connection node between the cooling pattern 300 and the second wiring 420, that is, releases heat through the current output part 320, so that heat will not accumulate in the cooling circuit structure; since the cooling pattern 300 is electrically connected through the second conductive part, such as Figure 2-Figure 6 as well as Fig.13 As shown, when the refrigeration circuit structure is used for cooling, since the current flows into the second wiring 420 through the cooling pattern 300, the heat will be released through the current output part 320. At this time, in order to avoid the released heat from being re-transferred to the cooling pattern 300 and affecting the cooling effect, a heat-conducting layer 500 for extracting the heat can be provided in the display panel. By arranging the heat-conducting layer 500 and the second wiring 420 on the same side of the base substrate 100, so that the heat-conducting layer 500 is arranged close to the current output part 320, it is ensured that the heat dissipated by the current output part 320 can be absorbed and extracted by the heat-conducting layer 500 in time, so as to reduce the temperature gradient of the cooling pattern 300 and improve its cooling capacity; in addition, the orthographic projections of the second wiring 420 and the current output part 320 on the base substrate 100 are both located at the orthographic projection of the heat-conducting layer 500 on the base substrate 100, so as to ensure that the heat-conducting layer 500 has sufficient heat-conducting area, and the heat-conducting effect of the heat-conducting layer 500 on the current output part 320 and the second wiring 420 is guaranteed.

[0051] In some embodiments, the cooling pattern 300 includes a plurality of cooling lines 301, and the plurality of cooling lines 301 are arranged along at least one of a first direction and a second direction, and at least one light-emitting unit 201 is arranged between two adjacent cooling lines 301; a current input part 310 and a current output part 320 are respectively arranged at opposite ends of any cooling line 301; wherein the first direction and the second direction intersect with each other.

[0052] As for the cooling pattern 300, at least part of the cooling pattern 300 is located in the display area AA, and the cooling pattern 300 is used to cool the light-emitting unit 201 in the display area AA to avoid the problem of excessive temperature of the display panel; Figure 2-Figure 6As shown, the cooling pattern 300 may include a plurality of cooling lines 301, and the plurality of cooling lines 301 are arranged along at least one of a first direction and a second direction, and at least one light-emitting unit 201 is provided between two adjacent cooling lines 301; in one case, when the plurality of cooling lines 301 are arranged along the first direction or the second direction, the corresponding display area AA may be divided into a plurality of elongated sub-areas, and the light-emitting unit 201 is located in the elongated sub-area, and at least one of the two sides of the light-emitting unit 201 is used to cool the light-emitting unit 201, thereby reducing the overall temperature of the light-emitting unit 201.

[0053] In another case, when multiple cooling lines 301 are arranged along the first line 410 and the second line 420, the multiple cooling patterns 300 will form a grid structure in the display area AA and divide it into block sub-areas. Since at least one light-emitting unit 201 is arranged between two adjacent cooling lines 301, the light-emitting unit 201 is located in the grid of the grid structure, and the light-emitting unit 201 is surrounded by the cooling lines 301 on all sides, thereby further improving the cooling effect of the cooling lines 301 on the light-emitting unit 201; wherein, the first direction and the second direction can be cross-arranged to ensure that the multiple cooling lines 301 can be divided into multiple sub-areas in the display area AA.

[0054] In addition, the first direction may be an H direction, the second direction may be a V direction, and the H direction and the V direction may be arranged at an angle, wherein the angle between the H direction and the V direction may be any angle between 30° and 90°; for example, when the angle between the H direction and the V direction is 90°, Figure 2 As shown, the first direction can be in the horizontal direction (ie, 0°), and the second direction can be in the vertical direction (ie, 90°); or Figure 3 As shown, the first direction can be set to be inclined at 45°, and the second direction can be set to be inclined at 135°, which will not be repeated here.

[0055] In addition, for the cooling line 301, in order to ensure the heat transfer effect between the cooling line 301 and the current input part 310 and reduce the complexity of the current flow in the cooling pattern 300, when there are cooling lines 301 arranged along the first direction and the second direction in the display panel at the same time, and there is an electrical connection between the cooling pattern 300 and the first line 410 and the second line 420 respectively, it is ensured that the cooling line 301 arranged along the first direction and the cooling line 301 arranged along the second direction both have a good cooling effect.

[0056] In some embodiments, the cooling lines 301 are extended in a straight line, and two adjacent cooling lines 301 are parallel to each other.

[0057] For the cooling line 301, a plurality of cooling lines 301 are arranged in the display area AA, so that the cooling pattern 300 composed of the plurality of cooling lines 301 can be fully distributed in the display area AA, so as to improve the cooling effect of the cooling pattern 300 on the light emission in the display area AA; Figure 2 and Figure 3 As shown, in the display panel, by extending the cooling line 301 in a straight line, it is beneficial to control the length of the cooling line 301, so that it has a good cooling effect, and the material forming the cooling line 301 can be reduced, which is beneficial to controlling the production cost of the display panel; for any two adjacent cooling lines 301, the two adjacent cooling lines 301 are parallel to each other, which can ensure that the two lines can cool the light-emitting unit 201 located therebetween, which is beneficial to improving the cooling efficiency of the cooling line 301 on the light-emitting unit 201.

[0058] In some embodiments, the plurality of light-emitting units 201 include a blue light-emitting layer 201a, a green light-emitting layer 201b, and a red light-emitting layer 201c; for any cooling line 301, the cooling line 301 is extended in a folded line or a curve; the distance between the cooling line 301 and the blue light-emitting layer 201a is smaller than the distance between the cooling line 301 and the green light-emitting layer 201b, and the distance between the cooling line 301 and the blue light-emitting layer 201a is smaller than the distance between the cooling line 301 and the red light-emitting layer 201c.

[0059] As for the display panel, a plurality of light-emitting units 201 of different colors are arranged in the display panel, and the plurality of light-emitting units 201 of different colors may include a blue light-emitting layer 201a, a green light-emitting layer 201b, and a red light-emitting layer 201c. When the display panel is in a display state, since the wavelengths of the light emitted by the light-emitting units 201 of different colors are different, and the physical and chemical properties of the materials used to form the light-emitting units 201 are also quite different, the heat generated by the blue light-emitting layer 201a is relatively high, while the heat generated by the green light-emitting layer 201b and the red light-emitting layer 201c is relatively low; Figure 4 and Figure 5As shown, for any cooling line 301, the cooling line 301 can be extended in a folded line or a curve; since the heat generated by the blue light-emitting layer 201a is greater than the heat generated by the green light-emitting layer 201b, for the cooling line 301 in a curve or a folded line, the distance between the cooling line 301 and the blue light-emitting layer 201a can be made smaller than the distance between the cooling line 301 and the green light-emitting layer 201b, even if the cooling line 301 is bent or folded, and the bent or folded part is made close to the blue light-emitting layer 201a, the cooling efficiency of the cooling line 301 and the cooling effect on the blue light-emitting layer 201a are improved, which is beneficial to further reduce the temperature of the display area AA in the display panel.

[0060] Similarly, for any cooling line 301, the cooling line 301 can be extended in a folded line or a curve. Since the heat generated by the blue light-emitting layer 201a is greater than the heat generated by the red light-emitting layer 201c, for the cooling line 301 in a curve or a folded line, the distance between the cooling line 301 and the blue light-emitting layer 201a can be made smaller than the distance between the cooling line 301 and the red light-emitting layer 201c. Even if the cooling line 301 is bent or folded, and the bent or folded part is close to the blue light-emitting layer 201a, the cooling efficiency of the cooling line 301 and the cooling effect on the blue light-emitting layer 201a are improved, which is beneficial to further reduce the temperature of the display area AA in the display panel.

[0061] It should be noted that, for the light-emitting unit 201 in the display panel, it is affected by the materials that form the green light-emitting layer 201b and the red light-emitting layer 201c, and the heat generated by the green light-emitting layer 201b is slightly greater than that of the red light-emitting layer 201c; therefore, the distance between the cooling line 301 and the green light-emitting layer 201b can be made less than or equal to the distance between the cooling line 301 and the red light-emitting layer 201c. When the distance between the cooling line 301 and the green light-emitting layer 201b is less than the distance between the cooling line 301 and the red light-emitting layer 201c, the cooling efficiency of the cooling line 301 can be further improved; when the distance between the cooling line 301 and the green light-emitting layer 201b is equal to the distance between the cooling line 301 and the red light-emitting layer 201c, the difficulty of preparing the cooling line 301 can be reduced.

[0062] For example, taking the blue light-emitting layer 201a and the green light-emitting layer 201b in the light-emitting unit 201 as an example, Figure 7A-Figure 8B The blue light emitting layer 201a and the green light emitting layer 201b are described and analyzed:

[0063] For a display panel that does not include a cooling circuit structure composed of the cooling pattern 300, the first wiring 410, and the second wiring 420, as the display panel is continuously used, the light-emitting unit 201 in the display panel will continuously generate heat. Since the display panel lacks a cooling circuit structure, the heat inside the display panel is difficult to dissipate in a limited manner, and thus a continuous temperature rise phenomenon is likely to occur. When the loading current of the display panel reaches 15 mA / cm 2 , and the operating temperature of the display panel is maintained at 85°C, such as Fig. 7A as well as Figure 7B As shown, the time taken for the brightness of the blue light-emitting layer 201a to decay from 100% to 95% is approximately 90-95 hrs (hours), while the time taken for the brightness of the green light-emitting layer 201b to decay from 100% to 95% is approximately 40-43 hrs. It can be seen that for a display panel that does not include a cooling circuit structure, the aging speed of the blue light-emitting layer 201a and the green light-emitting layer 201b is relatively fast, the life of the display panel is relatively short, and the overall quality of the display panel is relatively poor.

[0064] For a display panel including a cooling circuit structure composed of a cooling pattern 300, a first wiring 410, and a second wiring 420, as the display panel is continuously used, the light-emitting unit 201 in the display panel will continuously generate heat. Since the display panel has a cooling circuit structure, the light-emitting unit 201 distributed in the display area AA can be cooled, and the heat can be timely discharged through the cooling circuit structure and the heat-conducting layer 500 to control the use temperature of the display panel. When the loading current of the display panel is 15 mA / cm 2 , and under the action of the refrigeration circuit, the operating temperature of the display panel can be maintained at 25°C. Fig. 8A as well as Figure 8B As shown, the time taken for the brightness of the blue light-emitting layer 201a to decay from 100% to 98% is approximately 155-160 hrs, and the time taken for the brightness of the green light-emitting layer 201b to decay from 100% to 98% is approximately 160-165 hrs. It can be seen that, compared with the display panel without a refrigeration structure, in the display panel with a refrigeration circuit structure, the aging speed of the blue light-emitting layer 201a and the green light-emitting layer 201b is relatively slow, the life of the display panel is relatively long, and the overall quality of the display panel is relatively good.

[0065] In some embodiments, at least part of the cooling pattern 300 is disposed in the pixel defining layer 200 to insulate the cooling pattern 300 located in the pixel defining layer 200; the pixel defining layer 200 includes a first defining portion 210 and a second defining portion 220; the first defining portion 210 is disposed on one side of the base substrate 100; a groove portion 211 is recessed on a side of the first defining portion 210 away from the base substrate 100, and at least part of the cooling pattern 300 is disposed in the groove portion 211; the second defining portion 220 is disposed on a side of the first defining portion 210 away from the base substrate 100 and is embedded in the groove portion 211; the orthographic projection of the groove portion 211 on the base substrate 100 is located within the orthographic projection of the second defining portion 220 on the base substrate 100.

[0066] As for the display panel, at least part of the cooling pattern 300 is disposed in the display area AA. When the cooling pattern 300 is connected to the external power supply through the first wiring 410 and the second wiring 420, the heat of the light-emitting unit 201 can be absorbed by the cooling pattern 300, thereby achieving the purpose of cooling the display area AA. Fig. 9 As shown, at least a portion of the cooling pattern 300 is disposed in the pixel defining layer 200, so that the pixel defining layer 200 covers the portion of the cooling pattern 300, thereby insulating the cooling pattern 300 located in the pixel defining layer 200, thereby preventing the portion of the cooling pattern 300 from contacting the light-emitting unit 201 or other wirings and causing a short circuit.

[0067] More specifically, Figure 10A-10C As shown, the pixel defining layer 200 includes a first defining portion 210 and a second defining portion 220; the first defining portion 210 is arranged on one side of the base substrate 100, and a groove portion 211 is recessed on the side of the first defining portion 210 away from the base substrate 100, and at least part of the cooling pattern 300 is arranged in the groove portion 211, and the groove portion 211 can provide an installation position for the cooling pattern 300 when preparing it, and can also block the cooling pattern 300 and the base substrate 100; the second defining portion 220 is arranged on the side of the first defining portion 210 away from the base substrate 100 and is embedded In the groove portion 211, the orthographic projection of the groove portion 211 on the base substrate 100 is located within the orthographic projection of the second limiting portion 220 on the base substrate 100, so as to cover the cooling pattern 300, so as to ensure that after the first limiting portion 210 and the second limiting portion 220 are combined, the insulation effect of the cooling wiring 301 located in the pixel defining layer 200 can be guaranteed; at the same time, by arranging the cooling pattern 300 in the pixel defining layer 200, the distance between the light-emitting unit 201 and the cooling pattern 300 can be shortened, which is beneficial to improving the cooling effect of the cooling pattern 300 on the light-emitting unit 201.

[0068] For example, Fig. 9 as well as Figure 10A-10C As shown, the display panel can be prepared in the following manner:

[0069] Step 1: If Fig. 10A As shown, a base substrate 100 is provided, a first limiting portion 210 is formed on one side of the base substrate 100 by using a deposition process and a patterning process, and a groove portion 211 is etched on a side of the first defining layer away from the base substrate 100 by using an etching process, so that the orthographic projection of the groove portion 211 on the base substrate 100 is located within the orthographic projection of the first limiting portion 210 on the base substrate 100, and the orthographic projection of the groove portion 211 on the base substrate 100 does not overlap with the orthographic projection of the light-emitting unit 201 on the base substrate 100.

[0070] Step 2: If Fig. 10B As shown, at least a portion of the cooling pattern 300 is formed in the groove 211 by using a deposition process and a patterning process, and the orthographic projection of the groove portion 211 on the base substrate 100 is located within the orthographic projection of the first limiting portion 210 on the base substrate 100 .

[0071] Step 3: If Fig. 10C As shown, the deposition process and the patterning process are again used to form the second defining portion 220 on the side of the first defining layer away from the base substrate 100, so that the second defining portion 220 covers part of the cooling pattern 300 in the groove portion 211, and the orthographic projection of the second defining portion 220 on the base substrate 100 is located within the orthographic projection of the first defining portion 210 on the base substrate 100.

[0072] Step 4: If Fig. 9 As shown, light-emitting units 201 of different colors, such as a blue light-emitting layer 201a, a green light-emitting layer 201b and a red light-emitting layer 201c, are formed in the openings of the pixel defining layer 200 by using a substrate process and an etching process; an encapsulation layer 600 is formed on the side of the pixel defining layer 200 away from the base substrate 100 by using an encapsulation process, so that the orthographic projections of the pixel defining layer 200 and the light-emitting unit 201 on the base substrate 100 are located within the orthographic projection of the encapsulation layer 600 on the base substrate 100, so as to protect and electrically insulate the light-emitting unit 201 and the cooling pattern 300.

[0073] In some embodiments, the display panel further includes an encapsulation layer 600; the encapsulation layer 600 is disposed on a side of the pixel defining layer 200 away from the base substrate 100; the pixel defining layer 200 and the light-emitting unit 201 are projected onto the base substrate 100 within the projected portion of the encapsulation layer 600 on the base substrate 100; at least a portion of the cooling pattern 300 is located between the pixel defining layer 200 and the encapsulation layer 600, or at least a portion of the cooling pattern 300 is located within the encapsulation layer 600.

[0074] For display panels, Fig.11 and Fig.12 As shown, the display panel further includes an encapsulation layer 600; wherein the encapsulation layer 600 is disposed on a side of the pixel defining layer 200 away from the base substrate 100, and for the encapsulation layer 600, the orthographic projections of the pixel defining layer 200 and the light emitting unit 201 on the base substrate 100 are located within the orthographic projection of the encapsulation layer 600 on the base substrate 100, so that the encapsulation layer 600 serves as a protective layer of the display panel, and can electrically insulate and protect the pixel defining layer 200, the light emitting unit 201 and the cooling pattern 300, which is beneficial to improving the overall strength of the display panel; more specifically, in some cases, at least a portion of the cooling pattern 300 is located between the pixel defining layer 200 and the encapsulation layer 600, that is, after the pixel defining layer 200 is formed, the cooling pattern 300 is formed on the surface of the pixel defining layer 200, and the cooling pattern 300 can also be used to cool the light emitting unit 201 and achieve the purpose of heat dissipation; and by arranging the cooling pattern 300 between the pixel defining layer 200 and the encapsulation layer 600, the preparation process of the display panel can be simplified, which is beneficial to controlling the preparation cost of the display panel.

[0075] In another case, at least part of the cooling pattern 300 can also be arranged in the encapsulation layer 600, that is, the encapsulation layer 600 can be divided into at least two stacked sub-encapsulation layers. During the preparation of the at least two sub-encapsulation layers, the part of the cooling pattern 300 can be prepared between the at least two sub-encapsulation layers, so that at least part of the cooling pattern 300 is located between two adjacent sub-encapsulation layers, that is, located inside the encapsulation layer 600. Similarly, the cooling pattern 300 can also be used to cool the light-emitting unit 201 and achieve the purpose of heat dissipation; and by arranging the cooling pattern 300 inside the encapsulation layer 600, the preparation process of the display panel can be simplified, which is beneficial to controlling the preparation cost of the display panel.

[0076] In some embodiments, the first routing line 410 and the second routing line 420 are both arranged in the non-display area NA; the first routing line 410 is electrically connected to the cooling pattern 300 through the current input part 310 in the non-display area NA, and the second routing line 420 is electrically connected to the cooling pattern 300 through the current output part 320 in the non-display area NA.

[0077] As for the first wiring 410 and the second wiring 420, the first wiring 410 is electrically connected to the cooling pattern 300 through the current input part 310, and the second wiring 420 is electrically connected to the cooling pattern 300 through the current output part 320 to form a cooling circuit structure. When the cooling pattern 300 is electrically connected to the external power supply and turned on, the cooling circuit structure can cool the light-emitting unit 201 through the current input part 310 and the cooling pattern 300, and dissipate the heat by using the current output part 320 of the cooling circuit structure and the second wiring 420; Figure 2-Figure 5 As shown, by arranging the first wiring 410 and the second wiring 420 in the non-display area NA, the first wiring 410 and the second wiring 420 are prevented from blocking the light-emitting unit 201; and since the first wiring 410 is electrically connected to the cooling pattern 300 through the current input part 310 in the non-display area NA, and the second wiring 420 is electrically connected to the cooling pattern 300 through the current output part 320 in the non-display area NA, heat is released by utilizing the connection node between the cooling pattern 300 and the second wiring 420, that is, the heat of the cooling circuit structure is released through the current output part 320. Since the current output part 320 and the second wiring 420 are located in the non-display area NA, the current output part 320 and the second wiring 420 can release heat in the non-display area NA, so as to reduce the temperature of the display area AA while reducing the interference degree to the display area AA when releasing heat.

[0078] In some embodiments, the first routing line 410 and the cooling pattern 300 are arranged on the same side of the base substrate 100, and the orthographic projection of the first routing line 410 on the base substrate 100 does not overlap with the orthographic projection of the light-emitting unit 201 on the base substrate 100; the second routing line 420 is arranged on the side of the base substrate 100 away from the cooling pattern 300, and is electrically connected to the cooling pattern 300 through the current output part 320 on the side of the base substrate 100 away from the cooling pattern 300.

[0079] As for the first wiring 410 and the second wiring 420, the first wiring 410 is electrically connected to the cooling pattern 300 through the current input part 310, and the second wiring 420 is electrically connected to the cooling pattern 300 through the current output part 320 to form a cooling circuit structure. When the cooling pattern 300 is electrically connected to the external power supply and is turned on, the cooling circuit structure can cool the light-emitting unit 201 through the current input part 310 and the cooling pattern 300, and dissipate heat through the current output part 320 and the second wiring 420; Figure 6 as well as Fig.13 As shown, by arranging the first wiring 410 and the cooling pattern 300 on the same side of the base substrate 100, and electrically connecting the two through the current input part 310, the orthographic projection of the first wiring 410 on the base substrate 100 does not overlap with the orthographic projection of the light-emitting unit 201 on the base substrate 100, thereby avoiding the first wiring 410 arranged in the display area AA from blocking the light-emitting unit 201, and the current input part 310 for connecting the first wiring 410 and the cooling pattern 300 can be located in the display area AA, thereby improving its cooling effect on the light-emitting unit 201; as shown in FIG. Fig.13As shown, the base substrate 100 and the pixel defining layer 200 can be provided with a transfer hole (not marked in the figure). When preparing the cooling pattern 300, the cooling pattern 300 is connected to the second wiring 420 through the transfer hole. Since the second wiring 420 is arranged on the side of the base substrate 100 away from the cooling pattern 300, and the second wiring 420 is electrically connected to the cooling pattern 300 through the current output part 320, the current output part 320 used to connect the cooling pattern 300 and the second wiring 420 can be arranged on the side of the base substrate 100 away from the pixel defining layer 200, that is, on the backlight side of the display panel, so that the cooling circuit structure releases heat on the backlight side of the display panel, and the heat resistance and heat insulation of the base substrate 100 can be used to block the heat, so as to reduce the influence of the current output part 320 on the light-emitting unit 201 in the display area AA when releasing heat.

[0080] Based on the same inventive concept, the present application also provides a display device, which includes the display panel as above; since the display device uses the display panel described above, it has all the advantages and beneficial effects of the display panel; exemplarily, the display device can be a mobile phone with display function, a computer, a self-service inquiry service desk, a movie screen, and a car display, etc., which have interactive function display devices and will not be repeated here.

[0081] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0082] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0083] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0084] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0085] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0086] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: The display panel has a display area and a non-display area surrounding the display area; the display panel includes: substrate substrate; A pixel defining layer is arranged on one side of the base substrate and is located in the display area; a plurality of light-emitting units are arranged in an array on the pixel defining layer; A cooling pattern, at least a portion of which is disposed in the display area; the cooling pattern and the pixel defining layer are disposed on the same side of the base substrate, the orthographic projection of the cooling pattern on the base substrate is located within the orthographic projection of the pixel defining layer on the base substrate, and the orthographic projection of the cooling pattern on the base substrate does not overlap with the orthographic projection of the light-emitting unit on the base substrate; A first routing line and a second routing line, a current input part and a current output part are respectively provided on both sides of the cooling pattern, the first routing line is electrically connected to the cooling pattern through the current input part, and the cooling pattern is electrically connected to the second routing line through the current output part.

2. The display panel according to claim 1, characterized in that: The cooling pattern is formed of a P-type semiconductor material, and the first wiring and the second wiring are both formed of an N-type semiconductor material.

3. The display panel according to claim 2, characterized in that: Also includes: A heat-conducting layer, wherein the heat-conducting layer and the second wiring are arranged on the same side of the base substrate; the orthographic projections of the second wiring and the current output portion on the base substrate are both located at the orthographic projection of the heat-conducting layer on the base substrate.

4. The display panel according to claim 3, characterized in that: The cooling pattern comprises: A plurality of cooling lines are arranged along at least one of a first direction and a second direction, and at least one of the light-emitting units is arranged between two adjacent cooling lines; the current input part and the current output part are respectively arranged at two opposite ends of any cooling line; wherein the first direction and the second direction intersect with each other.

5. The display panel according to claim 4, characterized in that: The refrigeration lines are extended in a straight line, and two adjacent refrigeration lines are parallel to each other.

6. The display panel according to claim 4, characterized in that: The multiple light-emitting units include a blue light-emitting layer, a green light-emitting layer and a red light-emitting layer; for any of the cooling lines, the cooling line is extended in a broken line or a curve; the distance between the cooling line and the blue light-emitting layer is smaller than the distance between the cooling line and the green light-emitting layer, and the distance between the cooling line and the blue light-emitting layer is smaller than the distance between the cooling line and the red light-emitting layer.

7. The display panel according to claim 3, characterized in that: At least a portion of the cooling pattern is disposed in the pixel defining layer so as to insulate the cooling pattern in the pixel defining layer; the pixel defining layer comprises: A first limiting portion is disposed on one side of the base substrate; a groove portion is recessed on one side of the first limiting portion away from the base substrate, and at least a portion of the cooling pattern is disposed in the groove portion; The second limiting portion is arranged on a side of the first limiting portion away from the base substrate and embedded in the groove portion; the orthographic projection of the groove portion on the base substrate is located within the orthographic projection of the second limiting portion on the base substrate.

8. The display panel according to claim 3, characterized in that: Also includes: The encapsulation layer is arranged on a side of the pixel definition layer away from the base substrate; the orthographic projections of the pixel definition layer and the light emitting unit on the base substrate are located within the orthographic projection of the encapsulation layer on the base substrate; at least a part of the cooling pattern is located between the pixel definition layer and the encapsulation layer, or At least a portion of the cooling pattern is located within the encapsulation layer.

9. The display panel according to claim 3, characterized in that: The first wiring and the second wiring are both arranged in the non-display area; the first wiring is electrically connected to the cooling pattern through the current input part in the non-display area, and the second wiring is electrically connected to the cooling pattern through the current output part in the non-display area.

10. The display panel according to claim 3, characterized in that: The first wiring and the cooling pattern are arranged on the same side of the base substrate, and the orthographic projection of the first wiring on the base substrate does not overlap with the orthographic projection of the light-emitting unit on the base substrate; the second wiring is arranged on a side of the base substrate away from the cooling pattern, and is electrically connected to the cooling pattern through the current output part on the side of the base substrate away from the cooling pattern.

11. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-10.

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