CN209822646U - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN209822646U CN209822646U CN201920812888.7U CN201920812888U CN209822646U CN 209822646 U CN209822646 U CN 209822646U CN 201920812888 U CN201920812888 U CN 201920812888U CN 209822646 U CN209822646 U CN 209822646U
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Abstract
The embodiment of the utility model discloses a display panel and display device, display panel include substrate base plate, a plurality of drive circuit and a plurality of organic light-emitting unit, organic light-emitting unit includes independent first electrode, organic luminescent layer and the second electrode that sets up, drive circuit and first electrode one-to-one and electricity are connected; the display panel further comprises a plurality of cathode signal metal wires, and each cathode signal metal wire is electrically connected with the second electrodes of the plurality of organic light-emitting units arranged along the extending direction of the cathode signal metal wire. By adopting the technical scheme, the loss of cathode signals in the transmission process is reduced, the cathodes of all the organic light-emitting units can receive the same or similar cathode signals, and the display uniformity of the display panel is ensured to be good; meanwhile, each organic light-emitting unit works independently and cannot interfere with each other, the situation that other organic light-emitting units are influenced due to the fact that the individual organic light-emitting units are obstructed is avoided, and good stability of the display panel is guaranteed.
Description
Technical Field
The embodiment of the utility model provides a relate to semiconductor technology field, especially relate to a display panel and display device.
Background
Currently, Organic Light-Emitting Diode (OLED) Display is the next generation flat panel Display technology superior to Liquid Crystal Display (LCD). Since the OLED can emit light, a backlight source is not needed, and the OLED display screen can be made lighter and thinner; meanwhile, the OLED display screen has a larger visual angle and richer colors, can display and save electric energy, can achieve the accuracy of dozens of microns to hundreds of microns according to the pixel size of the OLED display screen, and is high in display resolution. Based on the above advantages, OLED display is the focus of research in the display field today.
The OLED display screen is characterized in that the OLED display screen is of a basic structure of OLED pixel units, each OLED pixel unit comprises an anode, a cathode and an organic light-emitting material located between the anode and the cathode, the existing cathode is usually aluminum silver or ITO (indium tin oxide) evaporated on the whole surface, the thickness of the existing cathode needs to be thin to ensure the light-emitting efficiency, the resistance is large, a traditional OLED current signal needs to be conducted to a light-emitting center and other areas at the edge of the cathode, the conducting path is long, the resistance is large, under the condition that the conducting path of the current signal is long, the problem of voltage Drop (IR Drop) is easy to occur in the whole display circuit, namely the actual voltage conducted to the cathode is lower than the set voltage, the display effect is poor, and the electric energy.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present invention provide a display panel and a display device to solve the technical problem in the prior art that the display panel displays non-uniformly because cathodes of all OLED pixels are connected in parallel.
In a first aspect, an embodiment of the present invention provides a display panel, including a substrate, a plurality of driving circuits and a plurality of organic light emitting units, where the driving circuits and the organic light emitting units are located on one side of the substrate, and each organic light emitting unit includes a first electrode, an organic light emitting layer and a second electrode, which are independently arranged, and the driving circuits are in one-to-one correspondence with and electrically connected to the first electrodes;
the display panel further comprises a plurality of cathode signal metal wires, and each cathode signal metal wire is electrically connected with the second electrodes of the plurality of organic light-emitting units arranged along the extending direction of the cathode signal metal wire.
Optionally, the driving circuit and the organic light emitting unit are arranged in parallel on one side of the substrate;
the driving circuit at least comprises a driving thin film transistor, and a source electrode or a drain electrode of the driving thin film transistor is electrically connected with the first electrode of the organic light-emitting unit in the parallel direction of the plane of the substrate base plate.
Optionally, the display panel further includes an encapsulation layer located on a side of the organic light emitting unit away from the substrate, where the encapsulation layer covers the driving circuit and the organic light emitting unit;
the packaging layer comprises a first packaging part and a second packaging part, wherein an overlapping area exists between the vertical projection of the first packaging part on the substrate base plate and the vertical projection of the driving circuit on the substrate base plate, and an overlapping area exists between the second packaging part and the vertical projection of the organic light-emitting display unit on the substrate base plate;
the first package portion and the second package portion are independently provided; or the first package portion and the second package portion are integrally provided.
Optionally, a vertical projection of the driving circuit on the substrate base plate overlaps a vertical projection of the cathode signal trace on the substrate base plate.
Optionally, the driving thin film transistor is of a top gate structure, and the driving thin film transistor sequentially includes an active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, and a source/drain electrode, which are stacked; or the driving thin film transistor is of a bottom gate structure and comprises a gate, a gate insulating layer, an active layer and a source/drain electrode which are sequentially stacked;
the cathode signal metal wiring and the grid electrode are arranged on the same layer, and the grid insulating layer covers the grid electrode and the cathode signal metal wiring.
Optionally, the display panel further includes a plurality of scan lines located on one side of the substrate base plate;
the scanning lines and the grid electrodes are arranged on the same layer and are electrically connected, and the extending direction of the cathode signal metal routing is the same as the extending direction of the scanning lines.
The display panel further comprises a plurality of through hole structures and conductive columns positioned in the through hole structures;
the cathode signal metal trace is electrically connected with the second electrode through the conductive post.
Optionally, a vertical projection of the conductive pillar on the substrate base plate is staggered from a vertical projection of the first electrode on the substrate base plate.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel of the first aspect.
The embodiment of the utility model provides a display panel and display device, organic light emitting unit includes independent setting's first electrode, organic luminescent layer and second electrode, and display panel still includes many cathodic signal metal and walks the line simultaneously, and every cathodic signal metal walks the line and is connected with the second electrode electricity of a plurality of organic light emitting unit that set up along cathodic signal metal walking line extending direction, transmits the cathodic signal to the second electrode through cathodic signal metal walking line, has reduced the loss of cathodic signal in the transmission course, guarantees that display panel shows the homogeneity good; meanwhile, each organic light-emitting unit comprises a first electrode, an organic light-emitting layer and a second electrode which are independently arranged, so that each organic light-emitting unit independently works and cannot interfere with each other, the situation that other organic light-emitting units are influenced due to the fact that the individual organic light-emitting units are obstructed is avoided, and the good stability of the display panel is ensured.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic diagram of a display panel according to the prior art;
fig. 2 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of the display panel provided in FIG. 2 along the sectional line A-A';
fig. 4 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a packaging effect of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a packaging effect of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of another display panel according to an embodiment of the present invention;
fig. 8 is a schematic flowchart of a method for manufacturing a display panel according to an embodiment of the present invention;
fig. 9 is a schematic flow chart of another method for manufacturing a display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail through the following embodiments with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention all fall into the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a display panel in the prior art, and as shown in fig. 1, the prior art OLED display panel includes a plurality of OLED pixel units 10, only two OLED pixel units 10 are exemplarily shown in fig. 1, and each OLED pixel unit 10 includes an anode 101, a cathode 102, and an organic light emitting material 103 located between the anode 101 and the cathode 102. As shown in fig. 1, the conventional cathode 102 is an electrode deposited on the whole surface, and in order to ensure light extraction efficiency, the thickness of the cathode 102 needs to be small, which results in a large resistance on the cathode 102 and a large loss of a cathode signal on the anode 12. Moreover, in order to ensure normal light emission, the cathode 102 is generally made of metal oxide material, and the metal oxide material has a large resistance, which also causes a large loss of cathode signal on the anode 12.
Based on the above technical problem, an embodiment of the present invention provides a display panel, which includes a substrate, a plurality of driving circuits and a plurality of organic light emitting units located on one side of the substrate, wherein each organic light emitting unit includes a first electrode, an organic light emitting layer and a second electrode, which are independently arranged, and the driving circuits are in one-to-one correspondence with the first electrodes and are electrically connected to the first electrodes; the display panel further comprises a plurality of cathode signal metal wires, and each cathode signal metal wire is electrically connected with the second electrodes of the plurality of organic light-emitting units arranged along the extending direction of the cathode signal metal wire. By adopting the technical scheme, the cathode signal metal routing is additionally arranged and is electrically connected with the second electrodes of the plurality of organic light-emitting units arranged along the extending direction of the cathode signal metal routing, and because the resistance of the cathode signal metal routing is far smaller than that of the metal oxide cathode, the cathode signal is transmitted to the second electrodes through the cathode signal metal routing, so that the loss of the cathode signal in the transmission process is reduced, and the display uniformity of the display panel is ensured to be good; meanwhile, each organic light-emitting unit comprises a first electrode, an organic light-emitting layer and a second electrode which are independently arranged, so that each organic light-emitting unit independently works and cannot interfere with each other, the situation that other organic light-emitting units are influenced due to the fact that the individual organic light-emitting units are obstructed is avoided, and the good stability of the display panel is ensured.
Above is the core thought of the utility model, will combine the attached drawing in the embodiment of the utility model below, to the technical scheme in the embodiment of the utility model clearly, describe completely. Based on the embodiment in the utility model, ordinary technical personnel in this field do not make under the creative work prerequisite, all other embodiments that obtain all belong to the scope of the embodiment protection of the utility model.
Fig. 2 is a schematic diagram of a top view structure of a display panel provided by an embodiment of the present invention, and fig. 3 is a schematic diagram of a cross-sectional structure of the display panel provided by fig. 2 along a section line a-a', as shown in fig. 2 and fig. 3, the display panel provided by an embodiment of the present invention includes a substrate 20, a plurality of driving circuits 21 and a plurality of organic light emitting units 22 located on one side of the substrate 20, each organic light emitting unit 22 includes a first electrode 221, an organic light emitting layer 222 and a second electrode 223, which are independently disposed, and the driving circuits 21 are in one-to-one correspondence with and electrically connected to the first electrodes 221; the display panel further includes a plurality of cathode signal metal traces 23, and each cathode signal metal trace 23 is electrically connected to the second electrodes 223 of the plurality of organic light emitting units 22 arranged in the extending direction of the cathode signal metal trace 23.
Illustratively, the first electrode 221 represents an anode in the organic light emitting unit 22, and the second electrode 223 represents a cathode in the organic light emitting unit 22. The display panel provided by the embodiment of the utility model comprises a plurality of cathode signal metal wires 23, and each cathode signal metal wire 23 is transmitted with a cathode signal; meanwhile, each cathode signal metal trace 23 is electrically connected to the second electrodes 223 of the plurality of organic light emitting units 22 arranged along the extending direction of the cathode signal metal trace 23, and is used for providing cathode signals to the second electrodes 223, so that no matter the organic light emitting units 22 located at the edge area of the display panel or the organic light emitting units 22 located at the central area of the display panel, the received cathode signals are all conducted through the cathode signal metal traces 23 corresponding to the cathode signals, because the resistance of the cathode signal metal trace 23 is much smaller than that of the metal oxide cathode, the voltage drop of the cathode signal trace on the cathode signal metal trace 23 is very small or negligible, the cathode signals received on the second electrodes 223 of the plurality of organic light emitting units 22 arranged along the extending direction of the cathode signal metal trace 23 are guaranteed to be the same or very small, and the display uniformity of the display panel is guaranteed to be good, the display effect of the OLED display device is greatly improved, and the electric energy loss is reduced.
Further, be different from the negative pole that whole face set up among the prior art, the embodiment of the utility model provides a display panel, every organic light-emitting unit is including independent setting's first electrode 221, organic luminescent layer 222 and second electrode 223, the utility model discloses second electrode 223 among every organic light-emitting unit 22 in the embodiment is mutual independence and insulating, every organic light-emitting unit 22 autonomous working, the independent display, can not interfere with each other, can avoid probably existing among the prior art when an organic light-emitting unit 22 breaks down, influence other organic light-emitting units 22, cause other organic light-emitting units 22 can't normally show or show unusually, guarantee that display panel stability is good.
For example, the substrate 20 may be a rigid substrate or a flexible substrate, and the material of the substrate 20 according to the embodiment of the present invention is not limited.
Alternatively, the organic light emitting layer 222 may include a hole injection layer, a hole transport layer, a light emitting material layer, an electron transport layer, and an electron injection layer (not shown), where the holes and the electrons combine in the light emitting material layer to release energy, so as to excite the light emitting material layer to emit light. The light emitting material layer may be a light emitting material layer emitting different colors, for example, a red light emitting material layer, a green light emitting material layer, a blue light emitting material layer, and a white light emitting material layer, which is not limited by the embodiment of the present invention.
To sum up, the embodiment of the present invention provides a display panel, by adding a cathode signal metal trace, the cathode signal metal trace is electrically connected to the second electrodes of a plurality of organic light emitting units arranged along the extending direction of the cathode signal metal trace, and since the resistance on the cathode signal metal trace is much smaller than the resistance of the metal oxide cathode, the cathode signal is transmitted to the second electrodes through the cathode signal metal trace, so that the loss of the cathode signal in the transmission process is reduced, and the display uniformity of the display panel is ensured to be good; meanwhile, each organic light-emitting unit comprises a first electrode, an organic light-emitting layer and a second electrode which are independently arranged, so that each organic light-emitting unit independently works and cannot interfere with each other, the situation that other organic light-emitting units are influenced due to the fact that the individual organic light-emitting units are obstructed is avoided, and the good stability of the display panel is ensured.
Alternatively, as shown with continued reference to fig. 2 and 3, the driving circuit 21 and the organic light emitting unit 22 are juxtaposed on the substrate base plate 20 side; the driving circuit 21 includes at least a driving thin film transistor 211, and a source 2111 or a drain 2112 of the driving thin film transistor 211 is electrically connected to the first electrode 221 of the organic light emitting unit 22 in a direction parallel to the plane of the base substrate 20.
Exemplarily, compare as shown in fig. 1 and fig. 3, among the prior art, the driving circuit 21 and the organic light emitting unit 22 are stacked, that is, the organic light emitting unit 22 is located on one side of the driving circuit 21 away from the substrate base plate 10, which is different from the scheme in the prior art, in the display panel provided by the embodiment of the present invention, the driving circuit 21 and the organic light emitting unit 22 are arranged side by side on the same side of the substrate base plate 20, that is, along any direction parallel to the plane of the substrate base plate 20, the driving circuit 21 and the organic light emitting unit 22 are sequentially arranged, so that the thickness of the display panel can be reduced, the thin design of the display panel is realized, and the display panel is in line with the development area of the thin.
Optionally, the organic light emitting unit 22 may be in a top emission mode, in which case the first electrode 221 may be made of an opaque reflective material, and the second electrode 223 may be made of a transparent material; alternatively, the organic light emitting unit 22 may be in a bottom emission mode, in which case the first electrode 221 may be made of a transparent material, the second electrode 223 may be made of a transparent material, and the anode is made of an opaque reflective material; alternatively, the organic light emitting unit 22 may also be in a dual-sided light emitting mode, and in this case, the first electrode 221 and the second electrode 223 may both be made of transparent materials, so as to implement dual-sided display and transparent display. When organic light emitting unit 22 is end light emitting mode or two-sided light emitting mode, adopt the utility model discloses the technical scheme of embodiment, drive circuit 21 and organic light emitting unit 22 are when setting up with one side of substrate base plate 20 side by side promptly, and drive circuit 21 can not block the light that organic light emitting unit 22 sent, guarantees to improve display panel's luminous efficacy, promotes display panel's display effect.
Further, the driving circuit 21 and the organic light emitting unit 22 are disposed in parallel on the same side of the substrate 20, the source 2111 or the drain 2112 of the driving thin film transistor 211 in the driving circuit 21 can be directly electrically connected to the first electrode 221 in the organic light emitting unit 22, and the electrical connection relationship between the driving circuit 21 and the organic light emitting unit 22 is simple. Compared with the technical problems that in the prior art, when the organic light-emitting unit 22 is electrically connected with the driving circuit 21, punching is needed to realize electrical connection, the process is complex, and the requirement on alignment precision is high, the driving circuit 21 and the organic light-emitting unit 22 are arranged in parallel on the same side of the substrate base plate 20, the process is simple, and the preparation efficiency of the display panel is high.
Optionally, as shown in fig. 2 and fig. 3, the vertical projection of the driving circuit 21 on the substrate 20 overlaps with the vertical projection of the cathode signal metal trace 23 on the substrate 20.
Illustratively, since the driving circuit 21 and the organic light emitting unit 22 are disposed in parallel on one side of the substrate 20, there is an overlap between the vertical projection of the driving circuit 21 on the substrate 20 and the vertical projection of the cathode signal metal trace 23 on the substrate 20, so as to ensure that the cathode signal metal trace 23 is not overlapped with the light emitting region of the organic light emitting unit 22, specifically, the cathode signal metal trace 23 may not be overlapped with the first electrode 221 and the organic light emitting layer 222 of the organic light emitting unit 22, and ensure that the cathode signal metal trace 23 is not influenced by the normal light emitting display of the organic light emitting unit 22. Further, because the light emitting areas of the cathode signal metal trace 23 and the organic light emitting unit 22 are not overlapped, the cathode signal metal trace 23 can be set to have a larger line width, so that it is ensured that the resistance on the cathode signal metal trace 23 is smaller, the loss of the cathode signal on the cathode signal metal trace 23 is reduced, it is ensured that the second electrodes 223 of the plurality of organic light emitting units 22 electrically connected with the same cathode signal metal trace 23 can receive the same or similar cathode signals, and it is ensured that the display uniformity of the display panel is good.
Optionally, there is an overlap between the vertical projection of the driving circuit 21 on the substrate base plate 20 and the vertical projection of the cathode signal metal trace 23 on the substrate base plate 20, the cathode signal metal trace 23 may be disposed on one side of the driving circuit 21 away from the substrate base plate 20, or may be disposed on one side of the driving circuit 21 close to the substrate base plate 20, or the cathode signal metal trace 23 and a part of the film layers in the driving circuit 22 are disposed on the same layer, the embodiment of the present invention does not limit this, and only needs to ensure that the vertical projection of the driving circuit 21 on the substrate base plate 20 and the vertical projection of the cathode signal metal trace 23 on the substrate base plate 20 are overlapped, the cathode signal metal trace 23 and the light emitting region of the organic light emitting unit 22 are not overlapped, and it is ensured that the cathode signal metal trace 23 is disposed without; meanwhile, the cathode signal metal wire 23 is ensured to have a larger line width, and the loss of the cathode signal on the cathode signal metal wire 23 is small.
Furthermore, in order to realize the light and thin design of the display panel, the cathode signal metal wiring 23 and part of the film layers in the driving circuit 21 can be designed to be arranged on the same layer, so that the structure of the film layer of the display panel is simple, and the integrated design is easy. For example, the cathode signal metal trace 23 may be disposed at the same layer as the gate or the source/drain of the driving thin film transistor 211, which will be described in detail below.
First, a case where the cathode signal metal trace 23 can be disposed in the same layer as the gate electrode of the driving tft 211 will be described.
Specifically, the driving thin film transistor 211 in the driving circuit 21 may be a top gate structure or a bottom gate structure, and the embodiment of the present invention does not limit this, and fig. 3 only illustrates the driving thin film transistor 211 as a bottom gate structure, and fig. 4 only illustrates the driving thin film transistor 211 as a top gate structure. As shown in fig. 3, the driving thin film transistor 211 of the bottom gate structure includes a gate electrode 2115, a gate insulating layer 2114, an active layer 2113, and source/drain electrodes 2111/2112 which are sequentially stacked; the cathode signal metal trace 23 is disposed on the same layer as the gate 2115, and the gate insulating layer 2114 covers the gate 2115 and the cathode signal metal trace 23. As shown in fig. 4, the driving thin film transistor 211 of a top gate structure may include an active layer 2213, a gate insulating layer 2114, a gate electrode 2115, an interlayer insulating layer 2116, and source/drain electrodes 2111/2112, which are sequentially stacked.
Specifically, the cathode signal metal trace 23 may be disposed on the same layer as the gate 2115, so as to ensure a simple film relationship of the display panel. Further, the cathode signal metal trace 23 and the gate 2115 can be prepared in the same step, which ensures simple preparation process and high preparation efficiency of the display panel. Further, as shown in fig. 3 and fig. 4, the gate insulating layer 2114 covers the gate 2115 and the cathode signal metal trace 23, so that the cathode signal metal trace 23 is prevented from being short-circuited with the gate 2115, and normal operation and normal display of the display panel are ensured.
As shown in fig. 2, the display panel according to the embodiment of the present invention may further include a plurality of scan lines 241 located on one side of the substrate 20; the scan line 241 and the gate 2115 are disposed on the same layer and electrically connected, and when the cathode signal metal trace 23 and the gate 2115 are disposed on the same layer, the extending direction of the cathode signal metal trace 23 is the same as the extending direction of the scan line 241, so as to ensure that the cathode signal metal trace 23 and the scan line 241 are not crossed and a mutual short circuit does not occur, thereby ensuring that the display panel performs normal display.
Next, a case where the cathode signal metal trace 23 may be disposed at the same layer as the source/drain electrodes in the driving thin film transistor 211 will be described.
Optionally, the cathode signal metal trace 23 may be disposed on the same layer as the source 2111 and the drain 2112 (not shown in the figure), so as to ensure a simple film relationship of the display panel. Further, the cathode signal metal trace 23 can be prepared in the same step process as the source 2111 and the drain 2112, which ensures simple preparation process and high preparation efficiency of the display panel. Further, as shown in fig. 2, the display panel according to the embodiment of the present invention may further include a plurality of data lines 242 located on one side of the substrate 20; the data line 242 and the source 2111 are disposed on the same layer and electrically connected, and when the cathode signal metal trace 23 and the source 2111 are disposed on the same layer, the extending direction of the cathode signal metal trace 23 is the same as the extending direction of the data line 242 (not shown in the figure), so as to ensure that the cathode signal metal trace 23 and the data line 242 do not intersect and do not have a mutual short circuit, thereby ensuring that the display panel performs normal display.
Fig. 5 is a schematic diagram of a top view structure of another display panel provided by an embodiment of the present invention, fig. 6 is a schematic diagram of a top view structure of another display panel provided by an embodiment of the present invention, fig. 7 is a schematic diagram of a cross-sectional structure of another display panel provided by an embodiment of the present invention, which is combined as shown in fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, a display panel provided by an embodiment of the present invention may further include an encapsulation layer 25 located on one side of the organic light emitting unit 22 away from the substrate 10, and the encapsulation layer 25 covers the driving circuit 21 and the organic light emitting unit 22. The encapsulation layer 25 includes a first encapsulation portion 251 and a second encapsulation portion 252, a vertical projection of the first encapsulation portion 251 on the substrate base plate 20 and a vertical projection of the driving circuit 21 on the substrate base plate 20 have an overlapping area, and a vertical projection of the second encapsulation portion 252 on the substrate base plate 20 and a vertical projection of the organic light emitting unit 22 on the substrate base plate 20 have an overlapping area; wherein the first and second packing parts 251 and 252 are independently provided; or the first and second housing portions 251 and 252 are integrally provided.
Specifically, since the organic light emitting layer 222 in the organic light emitting unit 22 is corroded by water and oxygen to cause poor display effect, the encapsulation layer 25 needs to be disposed on the side of the organic light emitting unit 22 away from the substrate 20 for the organic light emitting display panel. Specifically, the encapsulation layer 25 may sequentially include a plurality of thin film encapsulation layers of organic material and inorganic material to perform water-oxygen protection on the organic light emitting unit 22. Further, because the embodiment of the utility model provides an in each organic light emitting unit 22 independent setting of display panel, consequently the encapsulated layer 25 forms the encapsulation of all-round parcel to each drive circuit 21 and organic light emitting unit 22, forms similar "returning" font packaging structure, as shown in fig. 5, greatly promotes display panel's encapsulation effect, guarantees that display panel's water oxygen separation ability is strong.
Further, the encapsulation layer 25 may include a first encapsulation portion 251 and a second encapsulation portion 252, a vertical projection of the first encapsulation portion 251 on the substrate base 20 and a vertical projection of the driving circuit 21 on the substrate base 20 have an overlapping area, and a vertical projection of the second encapsulation portion 252 on the substrate base 20 and a vertical projection of the organic light emitting unit 22 on the substrate base 20 have an overlapping area, wherein the first encapsulation portion 251 and the second encapsulation portion 252 may be integrally disposed, as shown in fig. 3 and 4; or may be provided independently, as shown in fig. 7, which is not limited by the embodiment of the present invention. Alternatively, when the first encapsulation portion 251 and the second encapsulation portion 252 are integrally provided, the encapsulation layer 25 is formed with a simple process. Moreover, when the first encapsulating portion 251 and the second encapsulating portion 252 are integrally arranged, along the direction perpendicular to the substrate 20, the thickness L1 of the first encapsulating portion 251 and the thickness L2 of the second encapsulating portion 252 satisfy L1> L2, so that the first encapsulating portion 251 and the second encapsulating portion 252 can form a structure similar to that shown in fig. 6, and the first encapsulating portion 251 can form an opaque encapsulating portion due to the larger encapsulating thickness, which is equivalent to the function of a black matrix, so that the crosstalk of light among different organic light emitting units 22 can be reduced, and the display effect of the display panel is ensured to be good. Optionally, when the first encapsulating portion 251 and the second encapsulating portion 252 are independently disposed, the first encapsulating portion 251 and the second encapsulating portion 252 may be separately prepared, for example, when the first encapsulating portion 251 is prepared, the first encapsulating portion 251 is ensured to be opaque by proper doping, the first encapsulating portion 251 is equivalent to a black matrix, so as to reduce crosstalk between different organic light emitting units 22, and ensure that the display effect of the display panel is good; meanwhile, the second encapsulation portion 252 may be completely transparent, as shown in fig. 6, which ensures that the light transmittance of the second encapsulation portion 252 is high and the display effect of the display panel is good.
Optionally, as shown in fig. 2, fig. 3, fig. 4, and fig. 7, the display panel provided in the embodiment of the present invention may further include a plurality of through hole structures 261 and conductive pillars 262 located in the through hole structures 261; the cathode signal metal trace 23 and the second electrode 223 are electrically connected through the conductive pillar 262.
For example, since the cathode signal metal trace 23 and the second electrode 223 are located on different film layers, when the electrical connection between the cathode signal metal trace 23 and the second electrode 223 is implemented, the pass-through structure 261 needs to be provided, and the conductive pillar 262 needs to be provided in the pass-through structure 261, so that the electrical connection between the cathode signal metal trace 23 and the second electrode 223 is implemented through the conductive pillar 262.
Optionally, as shown in fig. 3, fig. 4 and fig. 7, the vertical projection of the conductive pillar 262 on the substrate base plate 20 is staggered from the vertical projection of the first electrode 221 on the substrate base plate 20, so as to prevent a cathode signal transmitted by the conductive pillar 262 from being conducted to the first electrode 221, which may cause the organic light emitting unit 22 to fail to normally emit light for display.
It should be noted that, as shown in fig. 3, fig. 4 and fig. 7, since the via structure 261 may penetrate through the source 2111 or the drain 2112 of the driving thin film transistor 211, in order to avoid short circuit between the conductive pillar 261 and the source 2111 or the drain 2112, an insulating layer (not shown in the figure) may be first prepared in the via structure 261 between the conductive pillars 262, and then the conductive pillar 262 is prepared in the insulating layer, so that it is ensured that the cathode signal is conducted to the second electrode 223 through the conductive pillar 262, and meanwhile, the conductive pillar 261 is prevented from being short-circuited with the source 2111 or the drain 2112, and normal display of the display panel is ensured.
Based on the same utility model, the embodiment of the utility model provides a still provide a display panel's preparation method, as shown in fig. 8, the utility model provides a display panel's preparation method can include:
and S110, providing a substrate base plate.
For example, the substrate may be a rigid substrate or a flexible substrate, and the material of the substrate according to the embodiments of the present invention is not limited.
S120, preparing a plurality of driving circuits and a plurality of organic light emitting units on one side of the substrate, wherein each organic light emitting unit comprises a first electrode, an organic light emitting layer and a second electrode which are independently arranged, and the driving circuits are in one-to-one correspondence with the first electrodes and are electrically connected with the first electrodes.
Illustratively, unlike the cathode disposed on the whole surface in the prior art, in the method for manufacturing a display panel provided by the embodiment of the present invention, the first electrode, the organic light emitting layer, and the second electrode are independently disposed. A plurality of independent second electrodes that set up can be through preparing earlier the second electrode that the sculpture obtained a plurality of independent settings again behind the cathode electrode that the whole face set up, also can be through the direct preparation of mask technology and obtain a plurality of independent second electrodes that set up, the embodiment of the utility model provides a do not prescribe a limit to this.
S130, preparing a plurality of cathode signal metal wires on one side of the substrate, wherein each cathode signal metal wire is electrically connected with the second electrodes of the plurality of organic light-emitting units arranged along the extending direction of the cathode signal metal wire.
Exemplarily, the embodiment of the utility model provides a step of many cathode signal metal of preparation are add to the preparation method of display panel and are walked the line is walked to every cathode signal metal, it has the cathode signal to walk to go on the line transmission, because the resistance of cathode signal metal walking the line is far less than the resistance on the metallic oxide negative pole, therefore the voltage drop of cathode signal walking the line on cathode signal metal is walked the line is very little or can be ignored, guarantee that it is the same or very little that receive cathode signal on a plurality of organic light emitting unit's that cathode signal metal walks the line extending direction setting second electrode, it shows that the homogeneity is good to guarantee display panel, greatly improve OLED display device's display effect and reduce power consumption.
To sum up, the embodiment of the present invention provides a method for manufacturing a display panel, which comprises a process for manufacturing cathode signal metal traces by adding a cathode signal metal trace, wherein the cathode signal metal trace is electrically connected to second electrodes of a plurality of organic light emitting units arranged along an extending direction of the cathode signal metal trace, and the resistance of the cathode signal metal trace is much smaller than that of a metal oxide cathode, so that the cathode signal is transmitted to the second electrodes through the cathode signal metal trace, thereby reducing the loss of the cathode signal in the transmission process and ensuring that the display uniformity of the display panel is good; meanwhile, each organic light-emitting unit is prepared to comprise a first electrode, an organic light-emitting layer and a second electrode which are independently arranged, each organic light-emitting unit works independently and cannot interfere with each other, the situation that other organic light-emitting units are influenced due to the fact that the individual organic light-emitting units are obstructed is avoided, and the good stability of the display panel is guaranteed.
Optionally, fig. 9 is another display panel manufacturing method provided in an embodiment of the present invention, and fig. 9 is further optimized by arranging the driving circuit and the organic light emitting unit on one side of the substrate, as shown in fig. 9, for the display panel manufacturing method, the display panel manufacturing method provided in an embodiment of the present invention may include:
s210, providing a substrate base plate.
S220, preparing a plurality of driving circuits on one side of the substrate base plate, wherein each driving circuit at least comprises a driving thin film transistor.
And S230, preparing a plurality of organic light-emitting units on one side of the substrate base plate, wherein the source electrode or the drain electrode of the driving thin film transistor is electrically connected with the first electrode of the organic light-emitting unit in the parallel direction of the plane of the substrate base plate.
S240, preparing a plurality of cathode signal metal wires on one side of the substrate, wherein each cathode signal metal wire is electrically connected with the second electrodes of the plurality of organic light-emitting units arranged along the extending direction of the cathode signal metal wire.
Exemplarily, different from the lamination arrangement of the driving circuit 21 and the organic light emitting unit 22 in the prior art, in the preparation method of the display panel provided by the embodiment of the present invention, the driving circuit 21 and the organic light emitting unit 22 are arranged in parallel at the same side of the substrate 20, that is, the driving circuit 21 and the organic light emitting unit 22 are sequentially arranged along any direction parallel to the plane of the substrate 20, so that the thickness of the display panel can be reduced, the thin design of the display panel is realized, and the display panel conforms to the thin development area of the display panel; meanwhile, the driving circuit 21 does not block the light emitted by the organic light emitting unit 22, so that the light emitting efficiency of the display panel can be improved, and the display effect of the display panel can be improved. Further, compared with the technical problems that in the prior art, when the organic light emitting unit 22 is electrically connected with the driving circuit 21, punching is needed to realize electrical connection, the process is complex, and the requirement on alignment precision is high, the driving circuit 21 and the organic light emitting unit 22 are arranged in parallel on the same side of the substrate 20, the process is simple, and the preparation efficiency of the display panel is high.
Next, taking a driving thin film transistor in the driving circuit as a bottom gate thin film transistor, and setting the same layer of the cathode signal metal routing and the gate of the bottom gate thin film transistor as an example, a method for manufacturing a display panel in an actual manufacturing process is described in detail, and specifically, the method may be as follows:
a base substrate is provided.
And manufacturing grid electrodes and cathode signal metal wires of the bottom-grid thin film transistors on the substrate by adopting a dry etching or wet etching or ink-jet printing method. The gate and cathode signal metal traces may include multiple layers of materials, such as aluminum neodymium and molybdenum (AlNd/Mo) and aluminum neodymium and nitrogen-doped molybdenum (AlNd/MoNx), and the embodiments of the present invention are not limited thereto.
Adopting SiNx: and a silicon nitride film as a gate insulating layer.
An active layer of the bottom gate thin film transistor is prepared by adopting a dry etching method, a wet etching method or an ink-jet printing method, and the position of the active layer corresponding to the grid electrode is raised to form a shape similar to a small island. The active layer can be an a-Si-H hydrogenated amorphous silicon film or an n + a-Si phosphorus-doped amorphous silicon film, which is not limited by the embodiment of the present invention.
And preparing the source/drain electrode of the bottom gate thin film transistor by adopting a dry etching or wet etching or ink-jet printing method. The source/drain electrodes are generally made of a multi-layer material, such as Mo/Al/Mo, Mo/AlNd/Mo, MoNx/AlNi/MoNx, and the embodiment of the present invention does not limit this.
And preparing a first electrode by adopting a dry etching method, a wet etching method or an ink-jet printing method, wherein the first electrode is directly contacted with the source/drain electrode. The material used for the first electrode is generally Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Al (aluminum), Ag (silver), etc., which is not limited in the embodiments of the present invention.
The organic light-emitting layers are prepared by adopting a mask evaporation or ink-jet printing mode, and the organic light-emitting layers in different organic light-emitting units can be prepared by using the same mask plate through a translation method.
The second electrode is prepared by dry etching or wet etching or inkjet printing, and the material of the second electrode can be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Al (aluminum), Ag (silver), and the embodiment of the present invention does not limit this.
Prepare through-hole structure and lead electrical pillar, wherein lead electrical pillar material and contain one or more in Al (aluminium), Ag (silver), the Au gold, the embodiment of the utility model provides a do not restrict this.
The packaging layer is manufactured by adopting mask evaporation or ink-jet printing, and the material of the packaging layer can be organic polymer and inorganic polymer which are matched for use.
Based on same utility model concept, the embodiment of the utility model provides a still provide a display device, fig. 10 is the embodiment of the utility model provides a display device's schematic diagram, the embodiment of the utility model provides a display device 100 includes the utility model provides an arbitrary embodiment display panel 101. Optionally, the embodiment of the present invention provides a display device, which may be a mobile phone as shown in fig. 10, or a computer, a television, an intelligent wearable display device, etc., and the embodiment of the present invention does not specially limit this.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, but that the features of the various embodiments of the invention may be partially or fully coupled to each other or combined and may cooperate with each other and be technically driven in various ways. Numerous obvious variations, rearrangements, combinations, and substitutions will now occur to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (9)
1. A display panel is characterized by comprising a substrate, a plurality of driving circuits and a plurality of organic light-emitting units, wherein the driving circuits and the organic light-emitting units are positioned on one side of the substrate;
the display panel further comprises a plurality of cathode signal metal wires, and each cathode signal metal wire is electrically connected with the second electrodes of the plurality of organic light-emitting units arranged along the extending direction of the cathode signal metal wire.
2. The display panel according to claim 1, wherein the driver circuit and the organic light emitting unit are juxtaposed on the substrate side;
the driving circuit at least comprises a driving thin film transistor, and a source electrode or a drain electrode of the driving thin film transistor is electrically connected with the first electrode of the organic light-emitting unit in the parallel direction of the plane of the substrate base plate.
3. The display panel according to claim 2, further comprising an encapsulation layer on a side of the organic light emitting unit away from the substrate, the encapsulation layer covering the driving circuit and the organic light emitting unit;
the packaging layer comprises a first packaging part and a second packaging part, wherein an overlapping area exists between the vertical projection of the first packaging part on the substrate base plate and the vertical projection of the driving circuit on the substrate base plate, and an overlapping area exists between the second packaging part and the vertical projection of the organic light-emitting display unit on the substrate base plate;
the first package portion and the second package portion are independently provided; or the first package portion and the second package portion are integrally provided.
4. The display panel of claim 2, wherein a vertical projection of the driving circuit on the substrate base plate overlaps a vertical projection of the cathode signal trace on the substrate base plate.
5. The display panel according to claim 4, wherein the driving thin film transistor is of a top-gate structure, and the driving thin film transistor sequentially comprises an active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, and source/drain electrodes, which are stacked; or the driving thin film transistor is of a bottom gate structure and comprises a gate, a gate insulating layer, an active layer and a source/drain electrode which are sequentially stacked;
the cathode signal metal wiring and the grid electrode are arranged on the same layer, and the grid insulating layer covers the grid electrode and the cathode signal metal wiring.
6. The display panel according to claim 5, further comprising a plurality of scanning lines on one side of the substrate base plate;
the scanning lines and the grid electrodes are arranged on the same layer and are electrically connected, and the extending direction of the cathode signal metal routing is the same as the extending direction of the scanning lines.
7. The display panel of claim 2, further comprising a plurality of via structures and conductive pillars within the via structures;
the cathode signal metal trace is electrically connected with the second electrode through the conductive post.
8. The display panel according to claim 7, wherein a vertical projection of the conductive pillar on the substrate base plate is offset from a vertical projection of the first electrode on the substrate base plate.
9. A display device characterized by comprising the display panel according to any one of claims 1 to 8.
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| CN201920812888.7U CN209822646U (en) | 2019-05-31 | 2019-05-31 | Display panel and display device |
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| CN201920812888.7U CN209822646U (en) | 2019-05-31 | 2019-05-31 | Display panel and display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110164942A (en) * | 2019-05-31 | 2019-08-23 | 江苏集萃有机光电技术研究所有限公司 | A kind of display panel and preparation method thereof, display device |
| CN111524956A (en) * | 2020-05-09 | 2020-08-11 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN112558354A (en) * | 2020-12-09 | 2021-03-26 | 华南理工大学 | Backlight substrate and display panel |
-
2019
- 2019-05-31 CN CN201920812888.7U patent/CN209822646U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110164942A (en) * | 2019-05-31 | 2019-08-23 | 江苏集萃有机光电技术研究所有限公司 | A kind of display panel and preparation method thereof, display device |
| CN111524956A (en) * | 2020-05-09 | 2020-08-11 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN111524956B (en) * | 2020-05-09 | 2023-07-25 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN112558354A (en) * | 2020-12-09 | 2021-03-26 | 华南理工大学 | Backlight substrate and display panel |
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