CN107579099B - Display panel, preparation method thereof and display device - Google Patents
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Abstract
The invention discloses a display panel, a preparation method thereof and a display device, wherein an inducing electrode insulated from each anode is arranged between each anode, and the orthographic projection of the inducing electrode on the substrate base plate is positioned in the orthographic projection of the pixel defining layer on the substrate base plate, in the process of preparing the luminous layer of the display panel by adopting the ink-jet printing process, the induction electrode is loaded with the charges with the same polarity as the charges carried by the ink drops of ink-jet, and according to the action of like charges repelling and opposite charges attracting, during the ink jet printing process, droplets of organic light emitting material are prevented from being sprayed onto the pixel defining layer, to expel the droplets onto the anodes of the sub-pixels to be printed, and then ink drops of the sprayed organic luminescent material can accurately and effectively enter a specific opening area of the sub-pixel to form a luminescent layer, so that the problem of color mixing is avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a preparation method thereof and a display device.
Background
An Organic Light Emitting Diode (OLED) display has the advantages of low power consumption, self-luminescence, wide viewing angle, and fast response speed, and is one of the hot spots in the research field of current displays, and is considered as the next generation display technology.
Currently, the methods for forming a light emitting layer in an OLED display mainly include an evaporation method and an inkjet printing method. The evaporation method is mature in application of film formation in the preparation of the small-size OLED display, and the ink-jet printing method is considered as an important method for realizing mass production of the large-size OLED display because the film formation speed is high and the material utilization rate is high, so that large-size film formation can be realized. In general, when a light emitting layer is manufactured, a pixel defining layer is required to be manufactured on a substrate to define a region where each sub-pixel is located, and then an ink jet printing process is used to manufacture the light emitting layer in a specific opening region of the corresponding sub-pixel. However, in the process of manufacturing the light emitting layer by using the inkjet printing process, ink droplets of the organic light emitting material ejected from the inkjet printing apparatus may be sprayed onto the pixel defining layer, so that the organic light emitting material may not accurately enter a specific opening area of the sub-pixel, and the ink droplets may stay on the pixel defining layer and may even slide into an adjacent sub-pixel, thereby causing a color mixing problem.
Therefore, the technical problem to be solved by those skilled in the art is how to accurately and effectively make ink droplets enter a specific opening area of a subpixel.
Disclosure of Invention
The embodiment of the invention provides a display panel, a preparation method thereof and a display device, which are used for enabling ink drops to accurately and effectively fall into sub-pixels and avoiding the stay of the ink drops on a pixel defining layer when an ink-jet printing process is adopted to prepare a light-emitting layer so as to avoid the problem of color mixing.
Accordingly, an embodiment of the present invention provides a display panel, including: the pixel structure comprises a substrate, a plurality of sub-pixels and a pixel defining layer, wherein the sub-pixels are positioned on the substrate, the pixel defining layer is positioned between the sub-pixels, and each sub-pixel comprises an anode, a light emitting layer and a cathode which are sequentially positioned on the substrate; the display panel further includes: an induction electrode insulated from each of the anodes; the orthographic projection of the inducing electrode on the substrate base plate is positioned in the orthographic projection of the pixel defining layer on the substrate base plate;
the induction electrode is used for loading charges with the same polarity as the charges carried by ink drops of ink jet when the light emitting layer is formed on the anode by adopting an ink jet printing process.
Correspondingly, an embodiment of the present invention further provides a method for manufacturing any one of the display panels provided by the embodiment of the present invention, including:
forming a pattern of each of the anodes, the pixel defining layer, and the inducing electrode on the base substrate;
and spraying ink drops with charges on the anode by adopting an ink-jet printing process, loading the anode sprayed with the ink drops with charges with the polarity opposite to that of the ink drops, and loading the induction electrode with the charges with the polarity identical to that of the ink drops to form a pattern of the luminous layer.
Correspondingly, the embodiment of the invention also provides a display device which comprises any one of the display panels provided by the embodiment of the invention.
The invention has the following beneficial effects:
in the display panel, the preparation method thereof and the display device provided by the embodiment of the invention, the inducing electrodes insulated from the anodes are arranged among the anodes, and the orthographic projection of the inducing electrode on the substrate base plate is positioned in the orthographic projection of the pixel defining layer on the substrate base plate, in the process of preparing the luminous layer of the display panel by adopting the ink-jet printing process, the induction electrode is loaded with the charges with the same polarity as the charges carried by the ink drops of ink-jet, and according to the action of like charges repelling and opposite charges attracting, during the ink jet printing process, droplets of organic light emitting material are prevented from being sprayed onto the pixel defining layer, to expel the droplets onto the anodes of the sub-pixels to be printed, and then ink drops of the sprayed organic luminescent material can accurately and effectively enter a specific opening area of the sub-pixel to form a luminescent layer, so that the problem of color mixing is avoided.
Drawings
Fig. 1a is a schematic cross-sectional view of a display panel according to an embodiment of the invention;
fig. 1b is a schematic cross-sectional view illustrating a second exemplary embodiment of a display panel according to the present invention;
fig. 1c is a third schematic cross-sectional view of a display panel according to an embodiment of the invention;
fig. 2a is a schematic top view of a display panel according to an embodiment of the present invention;
fig. 2b is a second schematic top view of a display panel according to an embodiment of the present invention;
fig. 2c is a third schematic view of a top view structure of the display panel according to the embodiment of the invention;
FIG. 3 is a flow chart of a method of preparation provided by an embodiment of the present invention;
fig. 4a to 4e are schematic cross-sectional views illustrating steps performed in a fourth embodiment;
fig. 5a to 5f are schematic cross-sectional views illustrating steps performed in a fifth embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a display panel, a manufacturing method thereof and a display device according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The thickness and shape of each layer of film in the drawings do not reflect the true scale of the display panel, and are only intended to schematically illustrate the present invention.
An embodiment of the present invention provides a display panel, as shown in fig. 1a to 1c, the display panel may include: a substrate 100, a plurality of sub-pixels 110 disposed on the substrate 100, and a pixel defining layer 120 disposed between the sub-pixels 110, wherein each sub-pixel 110 includes an anode 111, a light emitting layer 112, and a cathode 113 sequentially disposed on the substrate 100; the display panel further includes: an induction electrode 130 provided to be insulated from each anode 111; the orthographic projection of the inducing electrode 130 on the substrate base plate 100 is positioned in the orthographic projection of the pixel defining layer 120 on the substrate base plate 100;
the inducing electrode 130 is used to apply charges having the same polarity as the charges charged in the ink droplets ejected when the light emitting layer 112 is formed on the anode 111 using the ink-jet printing process.
According to the display panel provided by the embodiment of the invention, the induction electrodes insulated from the anodes are arranged among the anodes, the orthographic projection of the induction electrodes on the substrate is positioned in the orthographic projection of the pixel defining layer on the substrate, and in the process of preparing the light emitting layer of the display panel by adopting an ink-jet printing process, the induction electrodes are loaded with the charges with the same polarity as the charges carried by ink drops of ink jet, and according to the effects of like polarity repulsion and opposite attraction among the charges, in the ink-jet printing process, the ink drops of organic light-emitting materials can be prevented from being sprayed on the pixel defining layer to extrude the ink drops onto the anodes of the sub-pixels to be printed, so that the sprayed ink drops of the organic light-emitting materials can accurately and effectively enter the specific opening areas of the sub-pixels to form the light emitting layer, and the problem of color mixing is avoided.
In a specific implementation manner, in the display panel provided by the embodiment of the invention, the orthographic projection of the inducing electrode on the substrate is in a grid shape surrounding the orthographic projection of each sub-pixel on the substrate. And the width of the orthographic projection of the inducing electrode on the substrate is smaller than or equal to the width of the orthographic projection of the corresponding pixel defining layer on the substrate, so that the influence of the inducing electrode on the aperture opening ratio of the sub-pixels is avoided. In practical applications, the specific width of the inducing electrode needs to be designed and determined according to practical application environments, and is not limited herein.
Due to the difference in surface energy between the contact of the ink droplets of the organic light emitting material forming the light emitting layer and the pixel defining layer, and the drying behavior of the organic light emitting material itself, the organic light emitting material is liable to form an uneven film with high edges and thin middle, i.e., a coffee ring effect. In order to avoid the coffee ring effect, in a specific implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 1a to 1c, the display panel may further include: auxiliary electrodes 140 between the respective anodes 111 and the base substrate 100; the orthographic projection of the auxiliary electrode 140 on the substrate 100 is positioned in the orthographic projection of each anode 111 on the substrate 100;
the auxiliary electrode 140 is used to apply charges having a polarity opposite to that of the ink droplets when the light emitting layer is formed on the anode 111 using an ink jet printing process. Therefore, due to the fact that the charges of the ink drops are opposite to those of the auxiliary electrode, the ink drops and the auxiliary electrode can be attracted oppositely, the ink drops at the edges of the sub-pixels are gathered to the middle area, and therefore the adverse effect caused by the coffee ring effect is improved.
In a specific implementation manner, in the display panel provided in the embodiment of the present invention, the substrate may be a glass substrate or a flexible substrate. Further, as shown in fig. 1a to 1c, before the OLED structure including the anode 111, the light emitting layer 112 and the cathode 113 is formed on the substrate, a pixel driving circuit 114 located in each sub-pixel 110 is formed on the substrate 100 in advance, and the pixel driving circuit 114 is used for driving the OLED structure to emit light. The specific structure and the manufacturing process of the pixel driving circuit are substantially the same as those in the prior art, and are understood by those skilled in the art, and are not described herein again.
In order to avoid the influence of the level difference between the film layers forming the transistors in the pixel driving circuit on the film layers in the OLED structure, in a specific implementation, as shown in fig. 1a and 1b, in the display panel provided in the embodiment of the present invention, the display panel may further include: a first planarization layer 150 between the auxiliary electrode 140 and the base substrate 100 having the pixel driving circuit, and a second planarization layer 160 between the auxiliary electrode 140 and the anode 111. The first and second planarization layers 150 and 160 also have an insulating function. The anode 111 in the same subpixel 110 is electrically connected to the corresponding pixel driving circuit 114 through a via hole penetrating the first planarizing layer 150 and the second planarizing layer 160. Alternatively, in order to reduce the film layer and reduce the thickness of the display panel, in the display panel provided in the embodiment of the present invention, as shown in fig. 1c, the auxiliary electrode 140 may also be disposed in the same layer as the source and drain of the transistor in the pixel driving circuit. This can avoid an additional provision of the first planarizing layer. Of course, the auxiliary electrode may be disposed in the same layer as one electrode of the storage capacitor in the pixel driving circuit, and is not limited herein.
In practical applications, a general display panel is further provided with a PVDD signal line for providing a high-voltage signal to a pixel driving circuit and a Ref signal line for providing a reference signal, and in a specific implementation, in the display panel provided in the embodiment of the present invention, the PVDD signal line in the display panel for providing a high-voltage signal to the pixel driving circuit may be multiplexed as an auxiliary electrode; alternatively, Ref signal lines in the display panel for supplying reference signals to the pixel driving circuit may be multiplexed as auxiliary electrodes. In practical applications, the specific arrangement of the auxiliary electrode needs to be designed and determined according to practical application environments, and is not limited herein.
In a specific implementation manner, in the display panel provided in the embodiment of the invention, the anode may be a transparent single-layer conductive film, and a material of the single-layer conductive film may include one or more of an Indium Tin Oxide (ITO) material, an Indium Zinc Oxide (IZO) material, a carbon nanotube material, a graphene material, a nanogold material, and a nanosilver materialAnd (4) combining. Alternatively, the anode may be a transparent composite conductive film, and the composite conductive film may be stacked ITO, Ag, and ITO, stacked ITO, Al, and ITO, stacked Al and TiN, or stacked Al and MoOxEtc., and are not limited thereto.
In practical implementation, in the display panel provided in the embodiment of the present invention, the material of the inducing electrode may be the same as the material of the anode. Therefore, when the display panel is prepared, the original composition pattern is only required to be changed when the pattern of the anode is formed, the patterns of the induction electrode and the anode are simultaneously formed through one-time composition process, the process for independently preparing the induction electrode is not required to be added, the preparation process flow can be simplified, the production cost is saved, and the production efficiency is improved. Of course, the material of the inducing electrode may be a metal material, such as gold, silver, aluminum, etc., for the purpose of increasing the conductivity of the inducing electrode and reducing power consumption, and is not limited herein.
In practical implementation, in the display panel provided in the embodiment of the present invention, the light emitting layer includes at least three color light emitting layers. The light emitting layer may include three color light emitting layers, which are a red light emitting layer, a green light emitting layer, and a blue light emitting layer, respectively, for emitting white light by mixing three primary colors of red, green, and blue. The light emitting layer may include four color light emitting layers, which are a red light emitting layer, a green light emitting layer, a blue light emitting layer, and a white light emitting layer, respectively. Of course, the light emitting layer may also include light emitting layers of other colors, which need to be designed according to the actual application environment, and is not limited herein.
The first embodiment,
In practical implementation, in the display panel provided in the embodiment of the invention, as shown in fig. 1a, the inducing electrode 130 may be located on the pixel defining layer 120, and the display panel further includes an electrode isolation layer 170 located between the inducing electrode 130 and the cathode 113. This allows the inducing electrode 130 to more effectively repel ink droplets sprayed onto the pixel defining layer 120 and direct the ink droplets onto the anode 111 in the sub-pixel during the ink jet printing process.
Alternatively, in an implementation, as shown in fig. 1b, the inducing electrode 130 may also be located between the pixel defining layer 120 and the substrate 100. Specifically, the inducing electrode 130 is located between the pixel defining layer 120 and the second planarizing layer 160. Therefore, the thickness of the display panel can be reduced without adding an electrode isolation layer additionally.
In a specific implementation, in the display panel provided in the embodiment of the invention, as shown in fig. 2a, the inducing electrode 130 may be an integrated structure, that is, a grid structure disposed in a layer. The display substrate further includes a first trace (not shown in fig. 2 a) electrically connected to the inducing electrode 130. The first wire is used for transmitting charges with the same polarity as the charges carried by ink drops of ink jet to the induction electrode when the light emitting layer is formed on the anode by adopting an ink jet printing process. Thus, only one wire is needed to be arranged to input charges to the induction electrode. And the display panel is also provided with a connecting terminal electrically connected with the first wire, so that charges with the same polarity as the charges carried by ink drops of ink jet are input into the first wire through the connecting terminal.
In a specific implementation, in the display panel provided in the embodiment of the present invention, the first trace may be disposed on the same layer as a source/drain of a transistor in the pixel driving circuit, the inducing electrode is located between the pixel defining layer and the substrate, and the inducing electrode is electrically connected to the first trace through a via hole penetrating through the first planarizing layer and the second planarizing layer. Or, the inducing electrode is located on the pixel defining layer and electrically connected with the first wire through a via hole penetrating through the first and second planarization layers and the pixel defining layer. Of course, in practical applications, the film layer between the inducing electrode and the first trace may further include other film layers, which need to be designed and determined according to practical application environments, and is not limited herein. In order to further simplify the manufacturing process, the material of the first trace may be the same as the material of the source and drain electrodes disposed on the same layer, so that a pattern of the first trace and the source and drain electrodes of the transistor may be formed by a one-step patterning process.
In practical applications, in the display panel provided in the embodiment of the present invention, the cathode may be a whole layer of planar electrode. In addition, the cathode and the induction electrode can be electrically connected to reduce the resistance of the cathode and reduce the power consumption of the display panel.
Example II,
In practical implementation, in the display panel provided in the embodiment of the invention, as shown in fig. 1a, the inducing electrode 130 may be located on the pixel defining layer 120, and the display panel further includes an electrode isolation layer 170 located between the inducing electrode 130 and the cathode 113. This allows the inducing electrode 130 to more effectively repel ink droplets sprayed onto the pixel defining layer 120 and direct the ink droplets onto the anode 111 in the sub-pixel during the ink jet printing process.
Alternatively, in an implementation, as shown in fig. 1b, the inducing electrode 130 may also be located between the pixel defining layer 120 and the substrate 100. Specifically, the inducing electrode 130 is located between the pixel defining layer 120 and the second planarizing layer 160. Therefore, the thickness of the display panel can be reduced without adding an electrode isolation layer additionally.
In specific implementation, in the display panel provided in the embodiment of the invention, as shown in fig. 2b, the inducing electrode 130 may include a plurality of mutually independent inducing sub-electrodes 131, and referring to fig. 1a, fig. 1b and fig. 2b, where fig. 1a is a schematic cross-sectional structure along the AA 'direction in fig. 2b, fig. 1b is a schematic cross-sectional structure along the AA' direction in fig. 2b, and the display substrate may further include a plurality of second routing lines 181 (not shown in fig. 2 b) electrically connected to the inducing sub-electrodes correspondingly. The second trace 181 is used for transmitting charges having the same polarity as the charges carried by the ink droplets to the corresponding inducer electrode 131 when the light emitting layer is formed on the anode by the ink jet printing process. In addition, the display panel is further provided with connection terminals electrically connected to each of the second traces 181 in a one-to-one correspondence manner, so that charges having the same polarity as that of the charges carried by the ink droplets are input to the connected second traces through the connection terminals.
In a specific implementation, in the display panel provided in the embodiment of the invention, as shown in fig. 1a and fig. 1b, the same material is used for the same layer of each inductor electrode 131. Thus, the pattern of each inducer electrode 131 can be formed by one patterning process, and the manufacturing process can be simplified.
In specific implementation, in the display panel provided in the embodiment of the invention, as shown in fig. 1a, the inducer electrode 131 is located on the pixel defining layer 120, and the inducer electrode 131 is electrically connected to the corresponding second routing line 181 through a via penetrating through the first planarizing layer 150, the second planarizing layer 160, and the pixel defining layer 120. Alternatively, as shown in fig. 1b, the inducer electrode 131 is located between the pixel defining layer 120 and the second planarizing layer 160, and the inducer electrode 131 is electrically connected to the second routing line 181 through a via hole penetrating through the first planarizing layer 150 and the second planarizing layer 160. Certainly, in practical applications, the film layer between the inducer electrode and the second trace may further include other film layers, which need to be designed and determined according to practical application environments, and is not limited herein. In order to further simplify the manufacturing process, the material of the second trace may be the same as the material of the source and drain electrodes disposed on the same layer, so that a pattern of the second trace and the source and drain electrodes of the transistor may be formed by a one-step patterning process.
At present, display panels that implement a touch function using a self-capacitance principle have been widely used in the present life. After the display panel provided by the embodiment of the invention is prepared, the inducer electrode is in an idle state. Therefore, in specific implementation, the inducer electrode in the display panel provided by the embodiment of the invention can be reused as the self-capacitance touch electrode, and the second routing transmission inducer electrode is used as a signal of the self-capacitance touch electrode, so that the display panel realizes the self-capacitance touch function. Therefore, the process and the film layer for preparing the self-capacitance touch electrode do not need to be additionally added, the production cost can be saved, the thickness of the display panel is reduced, and the production efficiency is improved.
In order to avoid the shielding effect of the cathode on the inducer electrode multiplexed as the self-capacitance touch electrode, in a specific implementation, in the display panel provided in the embodiment of the present invention, an opening is formed in a region of the cathode corresponding to the inducer electrode, so that there is no overlapping region between the orthographic projection of the cathode on the substrate and the orthographic projection of the inducer electrode on the substrate as much as possible. In practical application, generally, the cathodes in the sub-pixels need to be electrically connected to input signals, so that the orthogonal projection of the connecting line between the cathodes in the sub-pixels on the substrate base plate and the orthogonal projection of the inducer electrode on the substrate base plate have an overlapping region, but the area of the overlapping region is very small, and therefore, the shielding effect of the overlapping region on the self-capacitance touch electrode is negligible within an error allowable range.
Example III,
In practical implementation, fig. 1c and fig. 2c are combined in a display panel provided in an embodiment of the present invention, where fig. 1c is a schematic cross-sectional view of the display panel shown in fig. 2c along the direction BB'. As shown in fig. 1c, the inducing electrode 130 may include: a plurality of first sub-electrodes 132 positioned between the pixel defining layer 120 and the substrate base plate 100, and a plurality of second sub-electrodes 133 positioned on the pixel defining layer 120; the display panel further includes a pixel isolating layer 190 between the second sub-electrode 133 and the cathode 113.
Also, as shown in fig. 2c, the first sub-electrode 132 may extend in a row direction of the sub-pixel 110, and the second sub-electrode 133 may extend in a column direction of the sub-pixel 110. In this way, the orthographic projection of each first sub-electrode 132 on the substrate and the orthographic projection of each second sub-electrode 133 on the substrate can form a grid shape surrounding the orthographic projection of the sub-pixel 110 on the substrate.
Alternatively, in a specific implementation, the first sub-electrodes may extend along the column direction of the sub-pixels, and the second sub-electrodes may extend along the row direction of the sub-pixels. In this way, the orthographic projection of each first sub-electrode on the substrate and the orthographic projection of each second sub-electrode on the substrate can form a grid shape surrounding the orthographic projection of the sub-pixel on the substrate.
In a specific implementation manner, in the display panel provided in the embodiment of the present invention, when the anode is a transparent single-layer conductive film, the materials of the first sub-electrode and the second sub-electrode may be the same as the material of the anode. When the anode is a transparent composite conductive film, the material of the first sub-electrode may be the same as that of a film layer of the composite conductive film near the substrate, and the material of the second sub-electrode may be the same as that of the remaining film layers of the composite conductive film except for the film layer of the composite conductive film which is the same as the material of the first sub-electrode. For example, when the composite conductive film is stacked ITO, Ag, and ITO, the first sub-electrode is made of ITO, and the second sub-electrode is made of Ag and ITO, so that a pattern of the first sub-electrode and ITO in the composite conductive film can be formed by a one-step patterning process, and a pattern of the second sub-electrode and Ag and ITO in the composite conductive film can be formed by a one-step patterning process, thereby simplifying the manufacturing process.
In a specific implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 1c, the display substrate may further include: a plurality of third traces 182. In particular, one first sub-electrode may be connected to one third trace. Or, in order to reduce the number of the wirings, at least two adjacent first sub-electrodes may be electrically connected to one third wiring; for example, two adjacent first sub-electrodes are electrically connected to one third wire; or three adjacent first sub-electrodes are electrically connected with one third wire; or, adjacent four first sub-electrodes are electrically connected to one third trace, which is not limited herein. The third wire is used for transmitting charges with the same polarity as the charges carried by ink drops of ink jet to the connected first sub-electrode when the light emitting layer is formed on the anode by adopting an ink jet printing process. And the display panel is also provided with a connecting terminal electrically connected with the third wire, so that charges with the same polarity as the charges carried by ink drops of ink jet are input into the third wire through the connecting terminal.
In a specific implementation, in the display panel provided in the embodiment of the present invention, the third trace may be disposed on the same layer as a source/drain electrode of a transistor in the pixel driving circuit, and the first sub-electrode is electrically connected to the corresponding third trace through a via hole penetrating through the first planarization layer and the second planarization layer. Of course, in practical applications, the film layer between the first sub-electrode and the third trace may further include other film layers, which need to be designed and determined according to practical application environments, and is not limited herein. In order to further simplify the manufacturing process, the material of the third trace may be the same as the material of the source and drain electrodes disposed on the same layer, so that a pattern of the third trace and the source and drain electrodes of the transistor may be formed by a one-step patterning process.
In a specific implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 1c, the display substrate may further include: a plurality of fourth traces 183. In particular, one second sub-electrode may be connected to one fourth wire. Or, in order to reduce the number of the wirings, at least two adjacent second sub-electrodes may be electrically connected to one fourth wiring; for example, two adjacent second sub-electrodes are electrically connected to one fourth wire; or three adjacent second sub-electrodes are electrically connected with one fourth wire; or, four adjacent second sub-electrodes are electrically connected to one fourth trace, which is not limited herein. The fourth wire is used for transmitting charges with the same polarity as the charges carried by ink drops of ink jet to the connected second sub-electrode when the light emitting layer is formed on the anode by adopting an ink jet printing process. And the display panel is also provided with a connecting terminal electrically connected with the fourth wire, so that charges with the same polarity as the charges carried by ink drops of ink jet are input into the fourth wire through the connecting terminal.
In a specific implementation, in the display panel provided in the embodiment of the present invention, the fourth trace may be disposed on the same layer as a source/drain electrode of a transistor in the pixel driving circuit, and the second sub-electrode is electrically connected to the corresponding fourth trace through a via hole penetrating through the first planarizing layer, the second planarizing layer, and the pixel defining layer. Of course, in practical applications, the film layer between the second sub-electrode and the fourth trace may further include other film layers, which need to be designed and determined according to practical application environments, and is not limited herein. In order to further simplify the manufacturing process, the material of the fourth trace may be the same as the material of the source and drain electrodes disposed on the same layer, so that a pattern of the fourth trace and the source and drain electrodes of the transistor may be formed by a one-step patterning process.
In a specific implementation manner, in the display panel provided in the embodiment of the present invention, the number of the first sub-electrodes connected to each third trace is the same as the number of the second sub-electrodes connected to each fourth trace. Thus, the preparation process can be unified.
At present, display panels that implement a touch function using a mutual capacitance principle have been widely used in today's life. After the display panel provided by the embodiment of the invention is manufactured, the inducing electrode composed of the first sub-electrode and the second sub-electrode is in an idle state. Therefore, the first sub-electrode and the second sub-electrode in the display panel provided by the embodiment of the invention can be multiplexed as a mutual capacitance touch electrode, and the third routing and the fourth routing are adopted to respectively transmit signals to the first sub-electrode and the second sub-electrode as mutual capacitance touch electrodes, so that the display panel realizes a mutual capacitance touch function. Therefore, the process and the film layer for preparing the mutual capacitance touch electrode do not need to be additionally added, the production cost can be saved, the thickness of the display panel is reduced, and the production efficiency is improved.
In order to avoid the shielding effect of the cathode pair on the first sub-electrode and the second sub-electrode multiplexed as the mutual capacitance touch electrode, in a specific implementation, in the display panel provided in the embodiment of the present invention, an area of the cathode corresponding to the induction electrode has an opening, so that an orthogonal projection of the cathode on the substrate base and an orthogonal projection of the first sub-electrode and the second sub-electrode on the substrate base have no overlapping area as much as possible. In practical application, generally, the cathodes in the sub-pixels need to be electrically connected to input signals, so that an orthogonal projection of the connecting line between the cathodes in the sub-pixels on the substrate and an orthogonal projection of the first sub-electrode and the second sub-electrode on the substrate have an overlapping region, but the area of the overlapping region is very small, and therefore, within an error tolerance range, a shielding effect of the overlapping region on the mutual capacitance touch electrode is negligible.
Based on the same inventive concept, an embodiment of the present invention further provides a method for manufacturing any one of the display panels provided by the embodiments of the present invention, as shown in fig. 3, the method may include the following steps:
s301, forming graphs of each anode, a pixel defining layer and an induction electrode on a substrate;
s302, ink drops with charges are sprayed on the anode by adopting an ink-jet printing process, the anode sprayed with the ink drops is loaded with charges with the polarity opposite to that of the charges carried by the ink drops, and the induction electrode is loaded with the charges with the polarity identical to that of the charges carried by the ink drops, so that a pattern of a light-emitting layer is formed.
According to the preparation method provided by the embodiment of the invention, in the process of preparing the light emitting layer of the display panel by adopting an ink jet printing process, the induction electrode is loaded with the charges with the same polarity as the charges carried by the ink drops of the ink jet, and the anode sprayed with the ink drops is loaded with the charges with the opposite polarity to the charges carried by the ink drops, so that the ink drops of the organic light emitting material can be prevented from being sprayed on the pixel defining layer in the ink jet printing process, the ink drops are extruded onto the anode of the sub-pixel to be printed, the ink drops of the sprayed organic light emitting material can accurately and effectively enter the specific opening area of the sub-pixel to form the light emitting layer, and the problem of color mixing is avoided.
Further, in practical implementation, in the preparation method provided by the embodiment of the present invention, before forming the patterns of each anode, the pixel defining layer, and the inducing electrode on the substrate, the method further includes: a pattern of an auxiliary electrode is formed on a base substrate.
And, when the anode spraying the ink drop is loaded with the electric charge with the polarity opposite to that of the electric charge of the ink drop, the method can further comprise: and applying charges with the polarity opposite to that of the sprayed ink drops to the auxiliary electrode corresponding to the anode of the sprayed ink drops. Therefore, due to the fact that the charges of the ink drops are opposite to those of the auxiliary electrode, the ink drops and the auxiliary electrode can be attracted oppositely, the ink drops at the edges of the sub-pixels are gathered to the middle area, and therefore the adverse effect caused by the coffee ring effect is improved.
In practical implementation, the manufacturing method provided by the embodiment of the invention further includes, before forming the auxiliary electrode, forming a pattern of the first planarization layer on the base substrate, and the base substrate has been formed with a pattern of each transistor in the pixel driving circuit of each sub-pixel in advance.
In practical implementation, in the preparation method provided by the embodiment of the present invention, after the forming of the auxiliary electrode and before the forming of the anode, the method further includes: a pattern of a second planarization layer is formed on the base substrate.
In a specific implementation, in the preparation method provided by the embodiment of the present invention, when all the light emitting layers include at least three color light emitting layers, ink droplets with charges are sprayed on the anode by an inkjet printing process, and the anode sprayed with the ink droplets is charged with charges with a polarity opposite to that of the charges charged by the ink droplets, which may specifically include: and sequentially spraying ink drops with charges of corresponding colors on the anodes corresponding to the light emitting layers of different colors by adopting an ink-jet printing process, and loading the charges with the polarity opposite to that of the charges of the sprayed ink drops to the anodes of the corresponding colors.
In particular, in the preparation method provided in the embodiment of the present invention, when the anode of the corresponding color is loaded with the charge with the polarity opposite to that of the sprayed ink droplet, in order to avoid spraying the ink droplet of the light emitting layer of the corresponding color on the anode corresponding to the light emitting layer of the other color, in the specific implementation, when the anode of the corresponding color is loaded with the charge with the polarity opposite to that of the sprayed ink droplet, the method further includes: all anodes except the anode of the corresponding color are charged with the same polarity as the charge charged by the sprayed ink droplets. Therefore, the ink drops of the luminescent layers with the corresponding colors are sprayed on the anodes corresponding to the luminescent layers with other colors through the action of like charges repelling each other, and the problem of color mixing is further reduced.
In practical implementation, in the preparation method provided by the embodiment of the invention, after the light emitting layers of all colors are formed, a pattern of the cathode is further formed on the substrate.
The following describes a method for manufacturing a display panel according to the present invention, taking the structures of the display panels shown in fig. 1a and 1c as examples.
Example four,
Taking the structure of the display panel shown in fig. 1a as an example, the preparation method provided by the embodiment of the invention may include the following steps:
(1) a pattern of the auxiliary electrode 140 is formed on the substrate base plate 100 using a one-time patterning process, as shown in fig. 4 a. In this step (1), the substrate 100 has been formed with the pixel driving circuit 114, the second trace 181 and the first planarization layer 150 in advance. The process of forming the pixel driving circuit 114, the second trace 181 and the first planarization layer 150 is the same as that of the prior art, and is not described herein again.
(2) A patterning process is used to form a second planarization layer 160 and a via hole 161 in each sub-pixel and penetrating through the first planarization layer 150 and the second planarization layer 160 on the substrate 100 with the auxiliary electrode 140 formed thereon, as shown in fig. 4 b. In the same subpixel, the orthogonal projection of the via 161 on the substrate 100 is located within the orthogonal projection of the drain of the transistor to be electrically connected to the anode formed on the substrate 100.
(3) A pattern of the pixel defining layer 120 is formed between sub-pixels on the substrate base plate 100 formed with the second planarization layer 160 using a one-time patterning process, as shown in fig. 4 c. In addition, when the pattern of the pixel defining layer 120 is formed, the pattern of the via hole 121 penetrating through the pixel defining layer 120, the first planarizing layer 150, and the second planarizing layer 160 is further formed; the orthographic projection of the via 121 on the substrate 100 is located in the orthographic projection of the second trace 181 on the substrate 100.
(4) Forming a pattern of each anode 111 and each inducer electrode in the inducing electrode 130 on the substrate 100 formed with the pixel defining layer 120 by using a one-step patterning process, so that each anode 111 is electrically connected with the drain of the corresponding transistor through the via hole 161, and the inducer electrode is electrically connected with the corresponding second routing line 181 through the via hole 121; as shown in fig. 4 d.
(5) The ink-jet printing process is adopted to spray charged ink drops of corresponding colors on anodes corresponding to the light-emitting layers of different colors in sequence, charge opposite to the charge carried by the sprayed ink drops is loaded to the anodes of corresponding colors, charge with the same polarity as the charge carried by the ink drops is loaded to each inducer electrode in the inducer electrodes, charge with the same polarity as the charge carried by the sprayed ink drops is loaded to all the anodes except the anodes of corresponding colors, and charge with the opposite polarity to the charge carried by the sprayed ink drops is loaded to the auxiliary electrode corresponding to the anodes of sprayed ink drops, so that the graph of the light-emitting layers is formed.
Specifically, taking the green light emitting layer as an example, as shown in fig. 4e, a green positively charged ink droplet ID is sprayed on the anode 111 corresponding to the green light emitting layer by an ink jet printing process, and the anode 111 corresponding to the green light emitting layer is charged with a charge with a polarity opposite to that of the ink droplet ID, that is, the anode 111 corresponding to the green light emitting layer is charged with a negative charge; and each inducer electrode in the inducing electrodes 130 is charged with the same polarity as the charge carried by the ink droplet ID, that is, each inducer electrode in the inducing electrodes 130 is charged with positive charges. This allows an electric field E1 directed from the inducing electrode 130 to the anode 111 corresponding to the green light-emitting layer between the inducing electrode 130 and the anode 111 corresponding to the green light-emitting layer, so as to guide the ink droplets ID to accurately and effectively drop onto the anode 111 through the electric field E1 and the action of opposite attraction, and to prevent the ink droplets ID from being sprayed onto the pixel defining layer 120. The other anodes except the anode corresponding to the green light emitting layer are loaded with the charges with the same polarity as the charges carried by the ink droplet ID, namely, the other anodes are loaded with positive charges, so that the ink droplet ID and the other anodes have a repulsive action, and the phenomenon that the ink droplet ID drips on the other anodes to cause color mixing is avoided. The auxiliary electrode 140 corresponding to the anode of the sprayed ink droplet ID is charged with a charge of the opposite polarity to the charge of the sprayed ink droplet ID, that is, the auxiliary electrode 140 is charged with a negative charge. Thus, an electric field E2 directed from the liquid droplet to the auxiliary electrode 140 is provided between the auxiliary electrode 140 and the liquid droplet on the anode 111 corresponding to the green light-emitting layer, so that the auxiliary electrode 140 has an attraction effect on the liquid droplet on the anode 111 corresponding to the green light-emitting layer to the middle region of the anode 111, thereby improving the coffee ring effect and further forming an improved pattern of the green light-emitting layer on the anode 111. Similarly, the process of forming the light emitting layers of the other colors is substantially the same as the process of forming the green light emitting layer, and is not described herein again.
(6) Sequentially forming patterns of an electrode isolation layer 170 and a cathode 113 on the substrate 110 on which the light emitting layers 112 of all colors are formed by adopting a one-step composition process; as shown in fig. 1 a.
Example V,
Taking the structure of the display panel shown in fig. 1c as an example, and taking the formed anode as a stacked ITO, Ag and ITO composite conductive film, where the first sub-electrode is the same as the ITO material close to the substrate, and the second sub-electrode is the same as the Ag and the ITO material far from the substrate, the preparation method provided by the embodiment of the present invention includes the following steps:
(1) a pattern of the auxiliary electrode 140, the third wire 182, the fourth wire 183, and the source and drain of the transistor in the pixel driving circuit 114 is formed on the substrate 100 by a single patterning process, as shown in fig. 5 a. The substrate 100 in step (1) has the remaining film layers of the transistors in the pixel driving circuit 114 formed in advance, and the process for forming the remaining film layers of the transistors in the pixel driving circuit 114 is the same as that in the prior art, and is not described herein again.
(2) A patterning process is used to form a second planarization layer 160, a via hole 162 penetrating the second planarization layer 160, and a via hole 163 in each sub-pixel and penetrating the second planarization layer 160 on the substrate 100 on which the auxiliary electrode 140 is formed, as shown in fig. 5 b. In the same subpixel, the orthogonal projection of the via 163 on the substrate 100 is located within the orthogonal projection of the drain of the transistor to be electrically connected to the anode formed on the substrate 100. And the orthographic projection of the via 162 on the substrate base plate 100 is located within the orthographic projection of the corresponding third trace 182 on the substrate base plate 100.
(3) Forming a pattern of the first sub-electrode 132 and the ITO layer 1111 in the anode between the sub-pixels on the substrate 100 on which the second planarization layer 160 is formed, using a one-time patterning process; as shown in fig. 5 c. The first sub-electrode 132 is electrically connected to the corresponding third wire 182 through the via 162, and the ITO layer 1111 is electrically connected to the drain of the corresponding transistor through the via 163.
(4) A pattern of the pixel defining layer 120 is formed between the sub-pixels on the substrate base plate 100 formed with the first sub-electrodes 132 using a one-time patterning process, as shown in fig. 5 d. In addition, when the pixel defining layer 120 is patterned, a via hole 122 penetrating through the pixel defining layer 120 and the second planarizing layer 160 is also patterned; the orthographic projection of the via 122 on the substrate base 100 is located in the orthographic projection of the fourth trace 183 on the substrate base 100.
(5) Forming a pattern of the second sub-electrode 133 and Ag and ITO layers 1112 in each anode on the substrate 100 on which the pixel defining layer 120 is formed; as shown in fig. 5 e. The ITO layer 1111 and the Ag and ITO layer 1112 together form the anode 111. The second sub-electrode 133 is electrically connected to the corresponding fourth wire 183 through the via 122.
(6) The ink-jet printing process is adopted to spray charged ink drops of corresponding colors on anodes corresponding to the light-emitting layers of different colors in sequence, charge opposite to the charge carried by the sprayed ink drops is loaded to the anodes of corresponding colors, charge with the same polarity as the charge carried by the ink drops is loaded to each inducer electrode in the inducer electrodes, charge with the same polarity as the charge carried by the sprayed ink drops is loaded to all the anodes except the anodes of corresponding colors, and charge with the opposite polarity to the charge carried by the sprayed ink drops is loaded to the auxiliary electrode corresponding to the anodes of sprayed ink drops, so that the graph of the light-emitting layers is formed.
Specifically, taking the green light emitting layer as an example, as shown in fig. 5f, a green positively charged ink droplet ID is sprayed on the anode 111 corresponding to the green light emitting layer by using an ink jet printing process, and the anode 111 corresponding to the green light emitting layer is charged with a charge having a polarity opposite to that of the ink droplet ID, that is, the anode 111 corresponding to the green light emitting layer is charged with a negative charge; and charges of the same polarity as the charges charged to the ink droplets ID are applied to each of the first sub-electrodes 132 and each of the second sub-electrodes 133 in the inducing electrodes 130, that is, the first sub-electrodes 132 and each of the second sub-electrodes 133 are positively charged. This makes it possible to have the electric field E01 directed from the first sub-electrode 132 to the anode 111 corresponding to the green light-emitting layer between the first sub-electrode 132 and the anode 111 corresponding to the green light-emitting layer, and the electric field E02 directed from the second sub-electrode 133 to the anode 111 corresponding to the green light-emitting layer between the second sub-electrode 133 and the anode 111 corresponding to the green light-emitting layer, so as to guide the ink droplets ID to accurately and effectively drip on the anode 111 by the action of the electric fields E01 and E02 and the opposite attraction, and to avoid the ink droplets ID from being sprayed on the pixel defining layer 120. The other anodes except the anode corresponding to the green light emitting layer are loaded with the charges with the same polarity as the charges carried by the ink droplet ID, namely, the other anodes are loaded with positive charges, so that the ink droplet ID and the other anodes have a repulsive action, and the phenomenon that the ink droplet ID drips on the other anodes to cause color mixing is avoided. And the auxiliary electrode 140 corresponding to the anode to which the ink droplet ID is sprayed is charged with a charge of the opposite polarity to that charged to the ink droplet ID, that is, the auxiliary electrode 140 is charged with a negative charge. Thus, an electric field E3 directed from the liquid droplet to the auxiliary electrode 140 is provided between the auxiliary electrode 140 and the liquid droplet on the anode 111 corresponding to the green light-emitting layer, so that the auxiliary electrode 140 has an attraction effect on the liquid droplet on the anode 111 corresponding to the green light-emitting layer to the middle region of the anode 111, thereby improving the coffee ring effect and further forming an improved pattern of the green light-emitting layer on the anode 111. Similarly, the process of forming the light emitting layers of the other colors is substantially the same as the process of forming the green light emitting layer, and is not described herein again.
(7) Sequentially forming patterns of a pixel isolation layer 190 and a cathode 113 on the substrate 110 on which all the color light emitting layers 112 are formed by adopting a one-step composition process; as shown in fig. 1 c.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises any one of the display panels provided by the embodiment of the invention. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention. The display device can be implemented by referring to the above embodiments of the display panel, and repeated descriptions are omitted.
In the display panel, the preparation method thereof and the display device provided by the embodiment of the invention, the inducing electrodes insulated from the anodes are arranged among the anodes, and the orthographic projection of the inducing electrode on the substrate base plate is positioned in the orthographic projection of the pixel defining layer on the substrate base plate, in the process of preparing the luminous layer of the display panel by adopting the ink-jet printing process, the induction electrode is loaded with the charges with the same polarity as the charges carried by the ink drops of ink-jet, and according to the action of like charges repelling and opposite charges attracting, during the ink jet printing process, droplets of organic light emitting material are prevented from being sprayed onto the pixel defining layer, to expel the droplets onto the anodes of the sub-pixels to be printed, and then ink drops of the sprayed organic luminescent material can accurately and effectively enter a specific opening area of the sub-pixel to form a luminescent layer, so that the problem of color mixing is avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A display panel, comprising: the pixel structure comprises a substrate, a plurality of sub-pixels and a pixel defining layer, wherein the sub-pixels are positioned on the substrate, the pixel defining layer is positioned between the sub-pixels, and each sub-pixel comprises an anode, a light emitting layer and a cathode which are sequentially positioned on the substrate; characterized in that, the display panel still includes: an induction electrode insulated from each of the anodes; the orthographic projection of the inducing electrode on the substrate base plate is positioned in the orthographic projection of the pixel defining layer on the substrate base plate;
the induction electrode is used for loading charges with the same polarity as the charges carried by ink droplets of ink jet when the light emitting layer is formed on the anode by adopting an ink jet printing process;
the induction electrode comprises a plurality of mutually independent inducer electrodes, and the display panel further comprises a plurality of second routing wires which are correspondingly and electrically connected with the inducer electrodes; wherein the inducing electrode is positioned on the pixel defining layer, and the display panel further comprises an electrode isolating layer positioned between the inducing electrode and the cathode; or, the inducing electrode is located between the pixel defining layer and the substrate base plate;
alternatively, the inducing electrode comprises: a plurality of first sub-electrodes positioned between the pixel defining layer and the substrate base plate, and a plurality of second sub-electrodes positioned on the pixel defining layer; the display panel further includes a pixel isolation layer between the second sub-electrode and the cathode; the first sub-electrodes extend along the row direction of the sub-pixels, and the second sub-electrodes extend along the column direction of the sub-pixels; alternatively, the first sub-electrodes extend in a column direction of the sub-pixels, and the second sub-electrodes extend in a row direction of the sub-pixels.
2. The display panel of claim 1, wherein the inducer electrodes are multiplexed as self-capacitance touch electrodes.
3. The display panel of claim 1, wherein the first sub-electrode and the second sub-electrode are multiplexed as a mutual capacitance touch electrode.
4. The display panel according to claim 1, wherein a material of the inducing electrode is the same as a material of the anode.
5. The display panel according to claim 2 or 3, wherein a region of the cathode corresponding to the inductive electrode has an opening.
6. The display panel according to any one of claims 1 to 4, wherein the display panel further comprises: auxiliary electrodes between the anodes and the substrate base plate; the orthographic projection of the auxiliary electrode on the substrate base plate is positioned in the orthographic projection of each anode on the substrate base plate;
the auxiliary electrode is used for loading charges with the polarity opposite to that of the charges carried by the ink drops when the light emitting layer is formed on the anode by adopting the ink jet printing process.
7. The display panel according to any one of claims 1 to 4, wherein all the light emitting layers include at least three color light emitting layers.
8. A method for manufacturing a display panel according to any one of claims 1 to 7, comprising:
forming a pattern of each of the anodes, the pixel defining layer, and the inducing electrode on the base substrate;
and spraying ink drops with charges on the anode by adopting an ink-jet printing process, loading the anode sprayed with the ink drops with charges with the polarity opposite to that of the ink drops, and loading the induction electrode with the charges with the polarity identical to that of the ink drops to form a pattern of the luminous layer.
9. The method according to claim 8, wherein when all of the light-emitting layers include at least three color light-emitting layers, the ink-jet printing process is used to spray charged ink droplets on the anode, and the anode sprayed with the ink droplets is charged with a polarity opposite to that of the ink droplets, and specifically comprises:
and sequentially spraying ink drops with charges of corresponding colors on the anodes corresponding to the light emitting layers with different colors by adopting the ink-jet printing process, and loading the charges with the opposite polarity to the charges of the sprayed ink drops to the anodes with the corresponding colors.
10. The method of claim 9, wherein when the anode of the corresponding color is charged with a charge having a polarity opposite to a charge of the ink droplets sprayed, further comprising: and charging all anodes except the anode of the corresponding color with the same polarity as the charge of the sprayed ink drop.
11. The method of claim 8, wherein before forming the pattern of each of the anode electrode, the pixel defining layer, and the inducing electrode on the substrate base plate, further comprising:
forming a pattern of an auxiliary electrode on the substrate base plate;
when the anode of the sprayed ink drop is charged with a charge opposite to the charge of the ink drop, the method further comprises the following steps: and applying charges with the polarity opposite to that of the sprayed ink drops to the auxiliary electrode corresponding to the anodes of the sprayed ink drops.
12. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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| CN110137366B (en) * | 2018-06-22 | 2021-12-07 | 友达光电股份有限公司 | Light emitting element and method for manufacturing the same |
| CN109148533B (en) | 2018-08-21 | 2020-09-01 | 武汉华星光电半导体显示技术有限公司 | Organic light-emitting diode display |
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| CN109920940B (en) | 2019-03-25 | 2021-01-01 | 京东方科技集团股份有限公司 | Display back plate and manufacturing method thereof |
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| CN111883691A (en) * | 2019-09-04 | 2020-11-03 | 广东聚华印刷显示技术有限公司 | Ink jet printing apparatus and method for manufacturing light emitting device |
| CN110571363B (en) | 2019-09-18 | 2022-06-17 | 京东方科技集团股份有限公司 | Display substrate, preparation method thereof and display device |
| CN110827700A (en) * | 2019-10-21 | 2020-02-21 | 武汉华星光电半导体显示技术有限公司 | OLED display panel and display device |
| CN113437233A (en) * | 2020-03-23 | 2021-09-24 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof and display device |
| WO2021189304A1 (en) * | 2020-03-25 | 2021-09-30 | 京东方科技集团股份有限公司 | Display substrate and display device |
| CN113611723A (en) * | 2020-07-28 | 2021-11-05 | 广东聚华印刷显示技术有限公司 | Pixel structure and display device |
| US20220310753A1 (en) * | 2020-09-29 | 2022-09-29 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Display panel and display device |
| CN112186016B (en) * | 2020-09-29 | 2022-07-12 | 京东方科技集团股份有限公司 | Display panel, preparation method thereof and display device |
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| CN114665052A (en) * | 2022-03-22 | 2022-06-24 | 深圳市华星光电半导体显示技术有限公司 | Organic display panel manufacturing method and organic display panel |
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