Patent Publication Number: US-2023133156-A1

Title: Display panel, manufacturing method thereof and display apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a National Stage of International Application No. PCT/CN2020/141039, filed Dec. 29, 2020, which claims priority to Chinese Patent Application No. 202010134649.8, filed Mar. 2, 2020, both of which are hereby incorporated by reference in their entireties. 
    
    
     FIELD 
     The present disclosure relates to the field of display, in particular to a display panel, a manufacturing method thereof and a display apparatus. 
     BACKGROUND 
     Compared with a liquid crystal display (LCD), an organic light-emitting diode (OLED) has the advantages of self-illumination, quick response, wide viewing angle, high brightness, beautiful color, light weight and thinness and so on, and is regarded as the next generation of a display technology. 
     A thin film deposition method of the OLED mainly includes vacuum evaporation and solution process. The solution process includes spin coating, ink-jet printing, a nozzle coating method and the like, is suitable for polymer materials and soluable micromolecules, has the characteristic of low device cost, and has the outstanding advantage in large-scale and large-size production. 
     By adopting an ink-jet printing technique, a solution can be subjected to ink jet accurately to a pixel limiting region to form an organic thin film. However, the pixel limiting region is small in size, a volatilization rate of a solvent has difference due to a length-width ratio in the pixel limiting region, consequently, the formed organic thin film is poor in thickness uniformity, and the light emitting quality of the OLED is affected. 
     SUMMARY 
     A display panel provided by an embodiment of the present disclosure, includes: 
     a base substrate, wherein a plurality of pixel units are arranged on the base substrate in an array; and 
     a pixel defining layer, located on the base substrate, wherein the pixel defining layer includes: a plurality of openings and at least one communicating groove, and the plurality of openings are located in the pixel units respectively; and 
     the communicating groove is configured to connect the openings corresponding to two pixel units with same color. 
     Optionally, in some embodiments of the present disclosure, the openings are rectangular and include first edges extending in a first direction and second edges extending in a second direction, and a length of the first edges is larger than that of the second edges; and 
     the communicating groove connect the two first edges close to each other in two adjacent openings. 
     Optionally, in some embodiments of the present disclosure, the plurality of pixel units are arranged in the first direction and the second direction in the array; and 
     two adjacent pixel units in the first direction display different colors, and two adjacent pixel units in the second direction display different colors. 
     Optionally, in some embodiments of the present disclosure, two adjacent pixel units in a third direction display same color; and 
     the third direction is different from the first direction and the second direction. 
     Optionally, in some embodiments of the present disclosure, a width of the communicating groove in the first direction is consistent with the length of the first edges. 
     Optionally, in some embodiments of the present disclosure, the display panel further includes: an organic light-emitting function layer located in the openings; wherein 
     a surface of the organic light-emitting function layer facing away from the base substrate serves as a first surface, and a surface of the pixel defining layer close to the base substrate serves as a second surface; and 
     a distance between the first surface and the second surface is smaller than a distance between a bottom surface of the communicating groove and the second surface. 
     Optionally, in some embodiments of the present disclosure, the pixel defining layer includes: a first pixel defining structure located on one side of the bottom surface of the communicating groove close to the base substrate, and a second pixel defining structure except for the first pixel defining structure; and 
     the second pixel defining structure is of an integrated structure. 
     Optionally, in some embodiments of the present disclosure, the first pixel defining structure is composed of lyophilic materials; and 
     the second pixel defining structure is composed of lyophobic materials. 
     Optionally, in some embodiments of the present disclosure, materials of the first pixel defining structure include silicon dioxide, silicon nitride, silicon oxynitride, polymethyl methacrylate or polyimide; and 
     materials of the second pixel defining structure include fluorinated polymethyl methacrylate or fluorinated polyimide. 
     Optionally, in some embodiments of the present disclosure, the pixel defining layer is of an integrated structure; 
     the bottom surface of the communicating groove has a lyophilic property; and 
     a surface except for all the communicating groove, of the pixel defining layer facing away from the base substrate, has a lyophobic property. 
     Optionally, in some embodiments of the present disclosure, a thickness of the pixel defining layer at a position except for the openings and the communicating grooves is within a range of 0.5 μm-3 μm. 
     Optionally, in some embodiments of the present disclosure, a distance between the bottom surface of the communicating groove and the surface of the pixel defining layer close to the base substrate is within a range of 0.1 μm-1 μm. 
     Accordingly, an embodiment of the present disclosure further provides a method for manufacturing the above display panel, including: 
     forming the pixel defining layer on the base substrate and patterning the pixel defining layer to form a plurality of openings and a plurality of communicating grooves; and 
     forming an organic light-emitting function layer through an ink-jet printing technique. 
     Optionally, in some embodiments of the present disclosure, the forming the pixel defining layer on the base substrate and patterning the pixel defining layer to form the plurality of openings and the plurality of communicating grooves, includes: 
     forming a first pixel defining layer on the base substrate through a lyophilic material and patterning the first pixel defining layer to obtain a plurality of first pixel defining structures; 
     forming a second pixel defining layer on the first pixel defining layer through a lyophobic material and patterning the second pixel defining layer to obtain a second pixel defining structure; or 
     forming the second pixel defining layer on the base substrate through a lyophobic material and patterning the second pixel defining layer to obtain the second pixel defining structure; and 
     forming the first pixel defining layer on the second pixel defining layer through the lyophilic material and patterning the first pixel defining layer to obtain the plurality of first pixel defining structures. 
     Optionally, in some embodiments of the present disclosure, the forming the pixel defining layer on the base substrate and patterning the pixel defining layer to form the plurality of openings and the plurality of communicating grooves, includes: 
     forming the pixel defining layer on the base substrate through the lyophobic material; and 
     patterning the pixel defining layer through a half-tone mask plate to obtain the openings and the communicating grooves with lyophilic bottom surfaces. 
     Accordingly, an embodiment of the present disclosure further provides a display apparatus, including the above display panel. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic diagram of a plane structure of a display panel provided by an embodiment of the present disclosure. 
         FIG.  2    is a schematic sectional diagram of  FIG.  1    at a dotted line L 1 . 
         FIG.  3    is a schematic sectional diagram of  FIG.  1    at a dotted line L 2 . 
         FIG.  4    is a schematic sectional diagram of  FIG.  1    at a dotted line L 3 . 
         FIG.  5    is a schematic diagram of another plane structure of a display panel provided by an embodiment of the present disclosure. 
         FIG.  6    is a schematic sectional diagram of  FIG.  5    at a dotted line L 1 . 
         FIG.  7    is a schematic sectional diagram of  FIG.  5    at a dotted line L 3 . 
         FIG.  8    is a flow diagram of a manufacturing method of a display panel provided by an embodiment of the present disclosure. 
         FIG.  9    is a schematic structural diagram corresponding to a step in a manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  10    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  11    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  12    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  13    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  14    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  15    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  16    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  17    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  18    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
         FIG.  19    is a schematic structural diagram corresponding to another step in the manufacturing method provided by an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Aiming at solving the problem that an organic thin film formed by adopting an ink-jet printing technique is poor in thickness uniformity, some embodiments of the present disclosure provide a display panel, a manufacturing method thereof and a display apparatus. 
     The implementations of the display panel, the manufacturing method thereof and the display apparatus provided by embodiments of the present disclosure are illustrated in detail below with reference to the drawings. The thicknesses and shapes of all film layers in the drawings do not reflect a true scale and are only intended to illustrate the contents of the present disclosure. 
     An embodiment of the present disclosure provides a display panel.  FIG.  1    is a schematic diagram of one plane structure of the display panel provided by the embodiment of the present disclosure.  FIG.  2    is a schematic sectional diagram of  FIG.  1    at a dotted line L 1 .  FIG.  3    is a schematic sectional diagram of  FIG.  1    at a dotted line L 2 .  FIG.  4    is a schematic sectional diagram of  FIG.  1    at a dotted line L 3 . As shown in  FIG.  1    to  FIG.  4   , the display panel includes: 
     a base substrate  10 , wherein a plurality of pixel units P are arranged on the base substrate  10  in an array; and 
     a pixel defining layer  11 , located on the base substrate  10 , wherein the pixel defining layer  11  includes: a plurality of openings U and at least one communicating groove T, and the plurality of openings U are located in all the pixel units P respectively; and 
     the openings U corresponding to the two pixel units P with the same color are connected through the communicating grooves T. 
     According to the above display panel provided by embodiments of the present disclosure, the communicating grooves are formed in the pixel defining layer to enable the openings corresponding to the two pixel units with the same color to communicate with each other, thus flowability of ink droplets is enhanced so as to improve thickness uniformity of an organic thin film formed by an ink-jet printing technique, thereby improving light emitting quality of an organic light-emitting diode. 
     The display panel provided by some embodiments of the present disclosure may be an organic light-emitting display panel. During implementation, as shown in  FIG.  1    and  FIG.  2   , the above display panel may further include: a plurality of first electrodes  12 , a second electrode  13  and organic light-emitting function layers  14  located between the first electrodes  12  and the second electrode  13 . The above first electrodes  12  are anodes, and the second electrode  13  is a cathode; or the above first electrodes  12  are cathodes, and the above second electrode  13  is an anode, which is not limited here. 
     The above pixel defining layer includes the plurality of openings U. The openings U are configured to limit opening regions of the pixel units P, and the plurality of openings U are in one-to-one correspondence with all the first electrodes  12  respectively. The corresponding first electrodes  12  are exposed through all the openings U, and thus the organic light-emitting function layers  14  may make contact with the first electrodes  12  so as to enable the first electrodes  12  to provide carriers to the organic light-emitting function layers  14 . In addition, a driving circuit may further be included between the first electrodes  12  and the base substrate  10 . The driving circuit is electrically connected with all the first electrodes  12  to provide driving signals to all the first electrodes  12  so as to realizing image display. 
     Optionally, the organic light-emitting function layers  14  may include film layers such as a light emitting layer  141 , a hole injection layer  142 , a hole transporting layer  143 , an electron injection layer  144  and an electron transporting layer  155 . 
     In an actual technique process, the organic light-emitting function layers  14  of the pixel units P with the same color may be made of the same materials. Therefore, the openings U corresponding to the two pixel units P with the same color are connected through the communicating grooves T. When the organic light-emitting function layers  14  are manufactured through the ink-jet printing technique, ink droplets may flow in the communicating grooves T and the openings U connected through the communicating grooves T, and a flow range of the ink droplets is enlarged, thereby enhancing flowability of the ink droplets and improving uniformity of the formed organic light-emitting function layers  14 . In a drying technique process of the ink-jet printing technique, a thin film with good uniformity is easier to obtain through drying, thereby also reducing requirements for an air pumping rate in a drying technique. In addition, aligning precision of an ink-jet printing device can also be reduced, thereby reducing the device cost. 
     During implementation, the two adjacent openings U may be connected through the above communicating grooves T. The communicating grooves T are prevented from being bent in order to avoid the other pixel units P, and it is ensured that the ink droplets have the good flowability in the communicating grooves T. 
     Optionally, in the above display panel provided by embodiments of the present disclosure, as shown in  FIG.  1    to  FIG.  4   , the openings U are rectangular and include first edges u 1  extending in a first direction S 1  and second edges u 2  extending in a second direction S 2 , and a length of the first edges u 1  is larger than that of the second edges u 2 ; and the communicating grooves T are connected with the two first edges u 1  close to each other in the two adjacent openings U. 
     Because the first edges u 1  and the second edges u 2  of the openings U are different in length, the ink droplets are printed in the openings U, the first direction S 1  and the second direction S 2  are different in volatilization rate, the volatilization rate in the second direction S 2  is larger, and film-forming uniformity in the second direction S 2  is poorer. In the embodiment of the present disclosure, the communicating grooves T are connected with the two first edges u 1  close to each other in the two adjacent openings U, thereby enlarging the flowing range of the ink droplets in the second direction S 2  and improving the film-forming uniformity of the second direction S 2 . 
     In some embodiments of the present disclosure, the above openings U are rectangular, which may be a standard rectangle or a corner-cut rectangle, which is not limited here. 
     During implementation, in the above display panel provided by embodiments of the present disclosure, as shown in  FIG.  1   , the plurality of pixel units P are arranged in the first direction S 1  and the second direction S 2  in the array; and 
     the two adjacent pixel units P in the first direction S 1  display different colors, and the two adjacent pixel units P in the second direction S 2  display different colors. 
     Referring to  FIG.  1   , the two adjacent pixel units P display the different colors in the first direction S 1  and the second direction S 2 , and therefore, the two openings U connected through the communicating grooves T are located on different rows and different columns. Optionally, the pixel units P displaying the different colors may be arrayed alternately in the first direction S 1  (or the second direction S 2 ) in a specified order. Taking the pixel units P divided into the three colors of red (R), green (G) and blue (B) as an example, the pixel units P may be arrayed alternately in the first direction S 1  in an order of RBG and may be arrayed alternately in the second direction S 2  in an order of RGB. In addition, other arraying modes can also be adopted, which is not limited here. 
     Further, in the above display panel provided by embodiments of the present disclosure, referring to  FIG.  1    as well, the two adjacent pixel units P in a third direction S 3  show the same color; and 
     the third direction S 3  is different from the first direction S 1  and the second direction S 2 . 
     As shown in  FIG.  1   , the third direction S 3  may be a diagonal direction of arraying of the pixel units P. The two openings U connected through the communicating grooves T may correspond to the two adjacent pixel units P in the third direction S 3 . Therefore, by forming the communicating grooves T, the flowing range of the ink droplets in the second direction S 2  can be enlarged, and film-forming uniformity of the second direction S 2  can be improved. 
     During implementation, as shown in  FIG.  1   , the plurality of communicating grooves T may be formed to enable the openings U corresponding to the plurality of pixel units P arrayed in the third direction S 3  to communicate with each other, thereby further enlarging the flowing range of the ink droplets. In the ink-jet printing technique process, the ink droplets can flow in a channel constituted by the plurality of openings U and the plurality of communicating grooves T until the thickness of the ink droplets is roughly uniform, thereby improving the film-forming uniformity of the organic light-emitting function layers and reducing control precision of volume difference of nozzle pieces. In actual application, the number of the openings U communicating with each other in the row of pixel units P in the third direction S 3  can be set according to actual conditions, which is not limited here. 
     In addition, the plurality of communicating grooves T may be formed to enable the openings U corresponding to the plurality of pixel units P in the third direction S 3  to communicate with each other, thereby further reducing the requirements for the ink-jet printing device. In the ink-jet printing technique process, the ink droplets can flow to the other opening U only by dripping the ink droplets to one of the openings U or communicating grooves T, thereby reducing the precision of the ink-jet printing device. Furthermore, when spray heads of the ink-jet printing device are blocked, the influence generated by spray head blocking on all the pixel units P is reduced because the plurality of openings U communicate with each other and the ink droplets are uniformly distributed in all the openings U. Therefore, when a finite number of spray heads is blocked in the ink-jet printing device, the influence on the overall effect of the ink-jet printing technique is small, thereby enlarging a technique window of the ink-jet printing technique. 
     In the organic light-emitting display panel, the service life of blue pixel units is generally shorter compared with red pixel units or green pixel units. In order to avoid the situation that the brightness of the blue pixel units is reduced due to attenuation and consequently the display effect of the display panel is affected, a size of the blue pixel units is generally greater than that of the red pixel units and the green pixel units, and the size of the red pixel units is smaller than that of the green pixel units. Therefore, in the embodiment of the present disclosure, all the red pixel units can communicate with each other through the communicating grooves, or the red pixel units and the red pixel units communicate with each other through the communicating grooves respectively, which can be set according to actual needs and is not limited here. 
     In actual application, in the above display panel provided by embodiments of the present disclosure, as shown in  FIG.  1   , a width D of the communicating grooves T in the first direction S 1  is consistent with the length of the first edges u 1 . Therefore, edges of the communicating grooves T may be aligned with the first edges u 1  of the openings U, thereby further improving the flowability of the ink droplets in the second direction S 2 . 
     Optionally, in the above display panel provided by embodiments of the present disclosure, as shown in  FIG.  1    and  FIG.  4   , may further include: the organic light-emitting function layers  14  located in the openings U; 
     a surface of one side of each organic light-emitting function layer  14  facing away from the base substrate  10  serves as a first surface W 1 , and a surface of one side of the pixel defining layer  11  close to the base substrate  10  serves as a second surface W 2 ; and 
     a distance a between the first surfaces W 1  and the second surface W 2  is smaller than a distance h between bottom surfaces W 3  of the communicating grooves T and the second surface, wherein the bottom surfaces W 3  of the communicating grooves T are bottoms of inner walls of the communicating grooves T. 
     That is to say, the organic light-emitting function layers  14  are only located in the corresponding openings U to prevent the carriers in the light-emitting function layers  14  from flowing into the other adjacent pixel units P and prevent mutual influence between the adjacent pixel units P, thereby improving the display effect of the display panel. In addition, it should be noted that in a manufacturing technique process, the ink droplets dripped into the openings U through the ink-jet printing technique are liquid, and the ink droplets can flow in the communicating grooves T and the openings U connected through the communicating grooves T. A solvent in the ink droplets is volatilized after a subsequent drying technique, and therefore, the formed organic light-emitting function layers  14  are left in the openings U. 
     During implementation, in the above display panel provided by embodiments of the present disclosure, as shown in  FIG.  1    to  FIG.  4   , the above pixel defining layer  11  may include: first pixel defining structures  111  located on one sides of the bottom surfaces of the communicating grooves T close to the base substrate  10 , and second pixel defining structures  112  except for all the first pixel defining structures  111 ; and 
     the second pixel defining structures  112  are of an integrated structure. 
     Because the first pixel defining structures  111  and the second pixel defining structures  112  are different in thickness, the pixel defining layer  11  is arranged to include the first pixel defining structures  111  and the second pixel defining structures  112 , and a composition technique can be adopted twice to manufacture the first pixel defining structures  111  and the second pixel defining structures  112  respectively. The composition technique has the low requirements for a mask plate and is simple. 
     Further, in the above display panel provided by embodiments of the present disclosure, referring to  FIG.  1    to  FIG.  4   , the above first pixel defining structures  111  are composed of lyophilic materials; and 
     the above second pixel defining structures  112  are composed of lyophobic materials. 
     By adopting the lyophilic materials to manufacture the first pixel defining structures  111 , the ink droplets can flow in the communicating grooves T. By adopting the lyophobic materials to manufacture the second pixel defining structures  112 , the ink droplets can be prevented from flowing to a position other than the openings U and the communicating grooves T. 
     Optionally, in the above display panel provided by embodiments of the present disclosure, the materials of the above first pixel defining structures include silicon dioxide, silicon nitride, silicon oxynitride, polymethyl methacrylate or polyimide; and 
     the materials of the second pixel defining structures include fluorinated polymethyl methacrylate or fluorinated polyimide. 
     During implementation, photoresist (e.g. positive photoresist) materials may be adopted to manufacture the above first pixel defining structures, therefore, the above first pixel defining structures can be obtained through a photolithography technique, and a manufacturing technique is simple, for example, the polymethyl methacrylate or polyimide materials may be adopted. Similarly, photoresist can also be adopted to manufacture the second pixel defining structures, for example, the fluorinated polymethyl methacrylate or fluorinated polyimide may be adopted. Or other materials can also be adopted to manufacture the above first pixel defining structures and the second pixel defining structures, and the materials of the first pixel defining structures and the materials of the second pixel defining structures are not limited here. 
     When inorganic materials such as silicon dioxide, silicon nitride and silicon oxynitride are adopted to manufacture the above first pixel defining structures, a dry etching technique can be adopted to obtain patterns of the first pixel defining structures. 
     In actual application, the above first pixel defining structures may also be composed of a plurality of stacked sub film layers, and all the sub film layers may be made of the same materials or the different materials. Similarly, the above second pixel defining structures may also be composed of a plurality of stacked sub film layers, and all the sub film layers may be made of the same materials or the different materials. 
     During implementation, in the above display panel provided by embodiments of the present disclosure,  FIG.  5    is a schematic diagram of another plane structure of the display panel provided by the embodiment of the present disclosure. A section of the schematic diagram of the plane structure shown in  FIG.  5    at a dotted line L 1  may be as shown in  FIG.  6   , a section at a dotted line L 2  may be as shown in  FIG.  3   , and a section at a dotted line L 3  may be as shown in  FIG.  7   . As shown in  FIG.  3    and  FIG.  5    to  FIG.  7   , the pixel defining layer  11  may be of an integrated structure; 
     the bottom surfaces of the communicating grooves T have a lyophilic property; and 
     in a surface of one side of the pixel defining layer  11  facing away from the base substrate  10 , the surfaces except for all the communicating grooves T have a lyophobic property. 
     The bottom surfaces of the above communicating grooves T have the lyophilic property so that the ink droplets can flow in the communicating grooves T. Furthermore, in the surface of one side of the pixel defining layer  11  facing away from the base substrate  10 , the surfaces except for the communicating grooves T have the lyophobic property so that the ink droplets can be prevented from flowing to the position other than the openings U and the communicating grooves T. 
     In the actual technique process, the above pixel defining layer  11  may be manufactured by adopting the lyophobic materials through a one-time composition technique. For example, the positive photoresist materials such as the fluorinated polymethyl methacrylate or fluorinated polyimide may be adopted, and therefore, the patterns of the pixel defining layer  11  can be obtained only by adopting the photolithography technique. The composition technique is less in the number of times, and a manufacturing cost is saved. Furthermore, the lyophobic materials are generally blended, taking the fluorinated polyimide as an example, lyophobic fluorides and lyophilic polyimide in the fluorinated polyimide are physically blended. After the fluorinated polyimide is coated on the base substrate, the fluorides have low surface energy, therefore, in technique processes such as solvent removing and exposure, the fluorides will migrate upwards to be aggregated on the surfaces of film layers. Therefore, after the photolithography technique is completed, the fluorides aggregated on the surfaces are removed at the positions of the communicating grooves, and the bottom surfaces of the communicating grooves T are the polyimide materials. That is to say, the performance of the bottom surfaces of the communicating grooves T is changed after the composition technique, and the bottom surfaces of the communicating grooves T are made to have the lyophilic property. 
     In actual application, in the above display panel provided by the embodiment of the present disclosure, as shown in  FIG.  1    and  FIG.  4   , a thickness H of the pixel defining layer  11  at a position except for all the openings U and all the communicating grooves T is within a range of 0.5 μm-3 μm. The thickness H of the pixel defining layer  11  is set to be within the range of 0.5 μm-3 μm, thus it can be ensured that the ink droplets do not flow to the position other than the openings U and the communicating grooves T in the ink-jet printing technique process, and the ink droplets are prevented from overflowing to influence the performance of the display panel. 
     Optionally, in the above display panel provided by embodiments of the present disclosure, referring to  FIG.  1    and  FIG.  4    as well, a distance h between the bottom surfaces of the communicating grooves T and the surface of one side of the pixel defining layer  11  close to the base substrate  10  is within a range of 0.1 μm-1 μm. In this way, in the ink-jet printing technique process the ink droplets can flow in the communicating grooves T and the openings U. After a drying technique, the formed organic light-emitting function layers  14  are only located in the openings U, and mutual influence between the adjacent pixel units P is avoided, thereby improving the display effect of the display panel. During implementation, the above distance h may also be set to be within the range of 0.5 μm-1 μm, or the distance h may also be set to be other sizes according to the actual condition, which is not limited here. 
     In addition, the communicating grooves T do not penetrate through the pixel defining layer  11  so as to play a role in covering the first electrodes  12  on the lower layer and signal lines, an electric leakage phenomenon is prevented, and influencing on the display performance is prevented. 
     Based on the same inventive concept, an embodiment of the present disclosure further provides a manufacturing method of the above display panel. Principles of the manufacturing method for solving the problems are similar to those of the display panel, therefore, implementation of the manufacturing method may refer to that of the display panel, which is not repeated here. 
     The manufacturing method of the display panel provided by embodiments of the present disclosure, as shown in  FIG.  8   , includes: 
     S 201 , a pixel defining layer is formed on a base substrate and the pixel defining layer is patterned to form a plurality of openings and a plurality of communicating grooves; and 
     S 202 , an organic light-emitting function layer is formed through an ink-jet printing technique. 
     In the manufacturing method provided by embodiments of the present disclosure, the pixel defining layer is patterned to form the plurality of openings and the plurality of communicating grooves, and the openings corresponding to the two pixel units with the same color can be connected through the communicating grooves. When the organic light-emitting function layer is manufactured through the ink-jet printing technique, ink droplets can flow in the communicating grooves and the openings, flowability of the ink droplets is enhanced, thickness uniformity of an organic thin film formed by the ink-jet printing technique is improved, thereby improving the light emitting quality of an organic light-emitting diode. 
     In actual application, before above step S 201 , the manufacturing method may further include: all film layers of a driving circuit are formed on the base substrate and all first electrodes are formed. 
     Optionally, in the above manufacturing method provided by embodiments of the present disclosure, taking structures as shown in  FIG.  1    and  FIG.  2    as an example, the above step S 201  may include: 
       FIG.  10    is a schematic sectional diagram of  FIG.  9    at a dotted line L 1 . As shown in  FIG.  9    and  FIG.  10   , a first pixel defining layer is formed on the base substrate  10  through a lyophilic material and the first pixel defining layer is patterned to obtain a plurality of first pixel defining structures  111 ; and 
       FIG.  12    is a schematic sectional diagram of  FIG.  11    at a dotted line L 1 . As shown in  FIG.  11    and  FIG.  12   , a second pixel defining layer is formed on the first pixel defining layer through a lyophobic material and the second pixel defining layer is patterned to obtain a second pixel defining structures  112 . 
     Because the first pixel defining structures  111  and the second pixel defining structures  112  are different in thickness, the first pixel defining structures  111  and the second pixel defining structures  112  are manufactured respectively through two times of composition process. The composition process has low requirements for the mask plate and is simple. Furthermore, the above first pixel defining structures  111  may be manufactured by adopting the lyophilic photoresist material, and the above second pixel defining structures  112  may be manufactured by adopting the lyophobic photoresist material. The patterns of the first pixel defining structures and the second pixel defining structures can be obtained only through the photolithography technique, the manufacturing process is simple, and the process cost is further reduced. 
     As shown in  FIG.  13   , in step S 202 , all the film layers in the organic light-emitting function layers  14  are manufactured through the ink-jet printing process one by one. The ink droplets are dripped into the openings and the communicating grooves. The ink droplets are large in flowability, and thus the formed organic film layers are good in uniformity. 
     After the above step S 202 , the method may further include: a second electrode  13  is formed so as to obtain a structure as shown in  FIG.  2   , and the second electrode  13  is generally of a whole surface structure capable of covering the pixel defining layer and the organic light-emitting function layers. 
     In addition, the second pixel defining structures may also be manufactured firstly and then the first pixel defining structures are manufactured. The manufacturing order of the first pixel defining structures and the second pixel defining structures is not limited here. Specifically, the above step S 201  may include: 
       FIG.  15    is a schematic sectional diagram of  FIG.  14    at a dotted line L 1 . As shown in  FIG.  14    and  FIG.  15   , a second pixel defining layer is formed on the base substrate  10  through the lyophobic material and is patterned to obtain the second pixel defining structures  112 ; and 
     the first pixel defining layer is formed on the second pixel defining layer through the lyophilic material and is patterned to obtain the plurality of first pixel defining structures  112  and obtain structures as shown in  FIG.  11    and  FIG.  12   . 
     In actual application, when the above display panel is of an integrated structure as shown in  FIG.  5   , the following method may be adopted for manufacturing. Taking structures as shown in  FIG.  5    and  FIG.  6    as an example, the above step S 201  may include: 
       FIG.  17    is a schematic sectional diagram of  FIG.  16    at a dotted line L 1 . As shown in  FIG.  16    and  FIG.  17   , the pixel defining layer  11  is formed on the base substrate  10  through the lyophobic material; and 
     the pixel defining layer  11  is patterned through a half-tone mask plate to obtain all the openings U and all the communicating grooves T with the lyophilic bottom surfaces. As shown in  FIG.  18    and  FIG.  19   ,  FIG.  19    is a schematic sectional diagram of  FIG.  18    at a dotted line L 1 . 
     The half-tone mask plate is adopted to pattern the pixel defining layer  11 . Furthermore, the lyophobic materials are generally blended, taking the fluorinated polyimide as an example, lyophobic fluorides and lyophilic polyimide in the fluorinated polyimide are physically blended. After the fluorinated polyimide is coated on the base substrate, the fluorides have the low surface energy, therefore, in technique processes such as solvent removing and exposure, the fluorides will migrate upwards to be aggregated on the surfaces of the film layers. Therefore, after the photolithography technique is completed, the fluorides aggregated on the surfaces are removed at the positions of the communicating grooves, and the bottom surfaces of the communicating grooves T are the polyimide materials. That is to say, the performance of the bottom surfaces of the communicating grooves T is changed after the composition technique, the bottom surfaces of the communicating grooves T are made to have the lyophilic property, therefore, the openings U and all the communicating grooves T can be obtained through the one-time composition technique, the composition technique is reduced, and the manufacturing cost is saved. In addition, the above pixel defining layer may be manufactured through the positive photoresist materials such as the fluorinated polymethyl methacrylate or fluorinated polyimide so that the patterns of the pixel defining layer  11  can be obtained only by adopting the photolithography technique, thereby further reducing the process steps and reducing the manufacturing cost. 
     Based on the same inventive concept, an embodiment of the present disclosure further provides a display apparatus, including the above display panel. The display apparatus may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a displayer, a notebook computer, a digital photo frame and a navigator. Principles of the display apparatus for solving the problems are similar to those of the above display panel, therefore, implementation of the display apparatus may refer to that of the above display panel, which is not repeated here. 
     According to the above display panel, the manufacturing method thereof and the display apparatus provided by embodiments of the present disclosure, the communicating grooves are formed in the pixel defining layer to enable the openings corresponding to the two pixel units with the same color to communicate with each other, thus the flowability of the ink droplets is enhanced so as to improve the thickness uniformity of the organic thin film formed by the ink-jet printing technique, thereby improving the light emitting quality of the organic light-emitting diode. 
     Although the preferred embodiments of the present disclosure have been described, those skilled in the art can make additional modifications and variations on the embodiments once they know the basic creative concept. Therefore, the appended claims intend to be explained as including the preferred embodiments and all modifications and variations falling within the scope of the present disclosure. 
     Obviously, those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. In this way, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent art, the present disclosure also intends to include these modifications and variations.