CN113178463B - Display panel and manufacturing method thereof - Google Patents
Display panel and manufacturing method thereof Download PDFInfo
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- CN113178463B CN113178463B CN202110373127.8A CN202110373127A CN113178463B CN 113178463 B CN113178463 B CN 113178463B CN 202110373127 A CN202110373127 A CN 202110373127A CN 113178463 B CN113178463 B CN 113178463B
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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Abstract
The embodiment of the invention discloses a display panel and a manufacturing method thereof. The display panel includes: an anode layer including a plurality of anodes, at least one of the anodes including a base and a first projection on the base; a pixel defining layer on the anode layer and including multiple first openings, each exposing a corresponding anode; the insulating layer comprises a plurality of first insulating units, and each first insulating unit is positioned on the corresponding first bump; and the light-emitting layer comprises a plurality of light-emitting units, and each light-emitting unit is positioned on the substrate of the corresponding anode and positioned in the corresponding first opening. According to the embodiment of the invention, the first insulating unit is arranged on the first protrusion on the anode layer in the pixel opening, so that the electrical connection between the luminescent material on the first protrusion of the anode and the first protrusion is prevented, the thickness uniformity of the effective luminescent unit is increased, and the luminescent uniformity is improved.
Description
Technical Field
The invention relates to the field of display, in particular to a display panel and a manufacturing method thereof.
Background
In recent years, inkjet printing technology has become more and more widely used in the display field.
At present, the array substrate has a complex structure, and the anode generates a first protrusion due to a large base offset at a pixel opening caused by the array substrate or a signal line, so that the thickness of ink printed on the anode is uneven, and the light emitting effect of the display panel is deteriorated.
Therefore, a display panel and a method for fabricating the same are needed to solve the above-mentioned problems.
Disclosure of Invention
The embodiment of the invention provides a display panel and a manufacturing method thereof, which can solve the technical problems that the substrate at the opening of a pixel has larger break difference due to structures such as an array substrate or a signal wire, so that a first bulge is generated on an anode, and the luminous effect of the display panel is poor due to the uneven film thickness of printed ink.
An embodiment of the present invention provides a display panel, including:
an anode layer comprising a plurality of anodes, at least one of said anodes comprising a substrate and a first projection on said substrate;
a pixel defining layer on the anode layer, including a plurality of first openings, each of which exposes a corresponding one of the anodes;
the insulating layer comprises a plurality of first insulating units, and each first insulating unit is positioned on the corresponding first bump;
a light emitting layer including a plurality of light emitting units, each of the light emitting units being located on the substrate of the corresponding anode and within the corresponding first opening;
the sum of the thickness of the first insulating unit and the thickness of the first bump is greater than or equal to the thickness of the light emitting layer.
In one embodiment, the display panel further comprises a cathode layer on the light emitting layer, at least a portion of the cathode layer being located within the first openings; the light emitting unit comprises two first parts which are respectively positioned at two opposite sides of the first insulating unit, and the two first parts are electrically connected with the corresponding anode and the cathode layer.
In an embodiment, the insulating layer further includes a plurality of second insulating units, each of the second insulating units is located between the substrate of the corresponding anode and the pixel defining layer, and each of the light emitting layers further includes a slope, and the slope is located on the second insulating unit.
In one embodiment, the first insulating unit, the second insulating unit and the pixel defining layer are made of the same material.
In one embodiment, the first portions have the same thickness and a flat surface.
In an embodiment, the display panel further includes an array substrate located on a side of the anode layer away from the pixel defining layer, the array substrate includes a plurality of thin film transistors and a trace connected to the thin film transistors, and the first protrusion corresponds to at least one of the trace.
In one embodiment, the first insulating unit covers the first protrusion and extends toward an edge of the first opening.
The embodiment of the invention also provides a manufacturing method of the display panel, which comprises the following steps:
providing a substrate;
forming an array substrate comprising a plurality of thin film transistors and wiring connected with the thin film transistors on the substrate;
forming a flat layer on the array substrate;
forming an anode layer including a plurality of anodes on the planarization layer, at least one of the anodes including a substrate and a first protrusion on the substrate;
forming a pixel defining material layer on the anode layer;
patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings and a plurality of first insulating units;
forming a light emitting layer in the first opening, wherein the light emitting layer includes a plurality of light emitting units, each light emitting unit is located on the substrate of the corresponding anode and located in the corresponding first opening, and the sum of the thickness of the first insulating unit and the thickness of the first protrusion is greater than or equal to the thickness of the light emitting layer;
forming a cathode layer on the light emitting layer, at least a portion of the cathode layer being located within the plurality of first openings;
each first insulating unit is located on the corresponding first protrusion, at least one wire corresponds to one first protrusion, the light emitting unit comprises two first parts respectively located on two opposite sides of the first insulating unit, and the two first parts are electrically connected to the corresponding anode and the corresponding cathode layer.
In one embodiment, the step of patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings and a plurality of first insulating units includes: patterning the pixel defining material layer by using a half-tone photomask to form a pixel defining layer comprising a plurality of first openings and a plurality of first insulating units; the pixel definition layer further comprises a first dam surrounding the first opening, the halftone mask comprises a first light-transmitting area, a second light-transmitting area and a third light-transmitting area, the first light-transmitting area corresponds to the first opening, the second light-transmitting area corresponds to the first insulating unit, and the third light-transmitting area corresponds to the first dam of the pixel definition layer.
In one embodiment, the step of patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings and a plurality of first insulating units includes: the pixel definition material layer is patterned by using a first photomask and a second photomask to respectively form a plurality of first insulating units and a pixel definition layer comprising a plurality of first openings correspondingly.
According to the embodiment of the invention, the first insulating unit is arranged on the first protrusion on the anode layer in the pixel opening, so that the electrical connection between the luminescent material on the first protrusion of the anode and the first protrusion is prevented, the thickness uniformity of the effective luminescent unit is increased, and the luminescent uniformity is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first structure of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second structure of a display panel according to an embodiment of the present invention;
FIG. 3 is a schematic top view illustrating a third structure of a display panel according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a fourth structure of a display panel according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for fabricating a display panel according to an embodiment of the present invention;
fig. 6 is a schematic flow chart illustrating a manufacturing method of a display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention. Furthermore, it should be understood that the detailed description herein is intended only to illustrate and explain the present invention, and is not intended to limit the present invention. In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" generally means upper and lower in the actual use or operation of the device, particularly in the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
At present, the structure of the array substrate is complex, the base at the opening of a pixel is large in break difference due to the structures such as the array substrate or a signal line, so that a first bulge is generated on an anode, the thickness of ink printed on the anode is uneven, and the luminous effect of a display panel is poor.
Referring to fig. 1 to 4, an embodiment of the invention provides a display panel 100, including:
an anode layer comprising a plurality of anodes 500, at least one of said anodes 500 comprising a substrate 501 and first protrusions 510 on said substrate 501;
a pixel defining layer on the anode layer, including a plurality of first openings 601, each of the first openings 601 exposing a corresponding one of the anodes 500;
an insulating layer including a plurality of first insulating units 710, each of the first insulating units 710 being located on a corresponding one of the first bumps 510;
a light-emitting layer including a plurality of light-emitting units, each of the light-emitting units being located on the substrate 501 of the corresponding anode 500 and located in the corresponding first opening 601.
According to the embodiment of the invention, the first insulating unit is arranged on the first protrusion on the anode layer in the pixel opening, so that the electrical connection between the luminescent material on the first protrusion of the anode and the first protrusion is prevented, the thickness uniformity of the effective luminescent unit is increased, and the luminescent uniformity is improved.
The technical solution of the present invention will now be described with reference to specific embodiments.
The display panel 100 includes an anode layer including a plurality of anodes 500, at least one of the anodes 500 including a substrate 501 and a first protrusion 510 on the substrate 501; a pixel defining layer on the anode layer, including a plurality of first openings 601, each of the first openings 601 exposing a corresponding anode 500; an insulating layer including a plurality of first insulating units 710, each of the first insulating units 710 being located on a corresponding one of the first bumps 510; a light emitting layer including a plurality of light emitting units, each of the light emitting units being located on the substrate 501 of the corresponding anode 500 and in the corresponding first opening 601. Please refer to fig. 1.
In fig. 1, 2, 4 and 6, the anode 500 may be used instead of the anode layer in describing the other film layers in the positional relationship with the anode layer.
In this embodiment, the display panel 100 further includes a substrate 200, an array substrate located on the substrate 200, a flat layer 400 located on the array substrate, the anode layer located on the flat layer 400, the pixel defining layer including a plurality of the first openings 601 located on the anode layer, the light emitting layer located in the first openings 601, and a cathode layer 520 located on the light emitting layer. The cathode layer 520 is a monolithic layer. The substrate 200 may be a flexible substrate 200 or a glass substrate 200, and is not limited herein, specifically refer to fig. 1 and fig. 4.
In this embodiment, the display panel 100 further includes a cathode layer 520 located on the light emitting layer, and at least a portion of the cathode layer 520 is located in the plurality of first openings 601; the light emitting unit includes two first portions 800 respectively located at two opposite sides of the corresponding first insulating unit 710, and both first portions 800 are electrically connected to the corresponding anode 500 and the corresponding cathode layer 520. The first portion 800 is an effective light emitting unit, and can electrically connect and conduct the corresponding anode 500 and the cathode layer 520 to perform uniform light emission.
In this embodiment, the insulating layer further includes a plurality of second insulating units 720, each of the second insulating units 720 is located between the corresponding substrate 501 of the anode 500 and the pixel defining layer, each of the light emitting layers further includes a slope 810, and the slope 810 is located on the second insulating unit 720. The pixel defining layer includes a first dam 610 surrounding the first opening 601, the pixel defining layer is replaced by the first dam 610, the second insulating unit 720 includes a second portion and a third portion connected to each other, the second portion is located between the anode layer and the first dam 610, the third portion is located in the first opening 601, and referring to fig. 2, the second portion and the third portion are easy to understand and have no reference number in the drawing. The printed light emitting layer may have a climbing phenomenon at the edge of the first opening 601, that is, on the inner wall of the first dam 610 corresponding to the first opening 601, for example, a slope 810 in fig. 2, which may cause the thickness of the light emitting layer near the first dam 610 to be non-uniform, thereby causing the light emitting effect of the display panel 100 to be poor, and even if there is the climbing phenomenon, the second insulating unit 720 is disposed between the inner wall of the first dam 610 corresponding to the first opening 601 and the anode layer, the second insulating unit 720 may block the current between the light emitting layer and the anode layer, so that the light emitting layer which climbs does not emit light, thereby improving the uniformity of light emission.
In this embodiment, the first dams 610 are connected to each other, and in the drawings, the drawings are convenient, so that the first dams 610 are only partially shown.
In this embodiment, the surface of the first insulating unit 710 away from the anode layer is flush with the surface of the second insulating unit 720 away from the anode layer. The light emitting layer can be better covered by a cathode layer 520, see fig. 4.
In this embodiment, the thickness of the second insulating unit 720 is the same as that of the first insulating unit 710, specifically referring to fig. 1 and fig. 2. The second insulating unit 720 and the first insulating unit 710 are fabricated in the same process, and the materials of the first insulating unit 710, the second insulating unit 720 and the pixel definition layer may be the same material, that is, when the pixel definition material is patterned and a mask is used for patterning, the transmittance of the mask corresponding to the second insulating unit 720 is the same as the transmittance of the mask corresponding to the first insulating unit 710, so the thickness of the second insulating unit 720 is the same as that of the first insulating unit 710, which is convenient for fabrication and simplifies the process.
In this embodiment, the thickness of the second insulating unit 720 is greater than that of the light emitting layer. The second insulating unit 720 can be disconnected when the light emitting layer is printed, so that the thickness of the light emitting layer through which current passes tends to be uniform, and the light emitting uniformity is improved.
In this embodiment, the second insulating unit 720 may be integrally disposed with the first dam 610, that is, only the third portion of the second insulating unit 720 extending to the first opening 601 remains.
In this embodiment, the materials of the first insulating unit 710, the second insulating unit 720 and the pixel defining layer are the same, insulating materials, and may be all photoresist materials, which may be positive photoresist or negative photoresist.
In this embodiment, the two first portions 800 have the same thickness and a flat surface. The first portions 800 having the same thickness and a flat surface are electrically connected to the corresponding anode 500 and the cathode layer 520, and the first portions 800 are effective light emitting units, so that the effective light emitting units having uniform thickness and a flat surface ensure uniformity of light emission.
In this embodiment, the display panel 100 further includes an array substrate located on a side of the anode layer away from the pixel definition layer, the array substrate includes a plurality of thin film transistors and a trace 300 connected to the thin film transistors, and the first protrusion 510 corresponds to at least one of the trace 300. The array substrate includes a routing layer, the flat layer 400 is located between the routing layer and the anode layer, the routing layer includes a plurality of routing lines 300, and at least one of the routing lines 300 corresponds to one of the first protrusions 510. The planarization layer 400 includes a plurality of second bumps 410, and one of the second bumps 410 corresponds to one of the first bumps 510, specifically referring to fig. 1, in the figure, the array substrate is not shown, and only the trace 300 is shown instead. Due to the arrangement of the trace 300, the second protrusion 410 may be formed on the planar layer 400, and the first protrusion 510 may be formed on the anode layer, and the first insulation unit 710 is disposed on the first protrusion 510, so that the first protrusion 510 and the cathode layer 520 corresponding to the first protrusion 510 may be isolated from each other, and even if the luminescent material is printed on the first protrusion 510 (even if the first insulation unit 710), the luminescent material on the first insulation unit 710 may not emit light, thereby ensuring that the thickness of the luminescent layer through which current passes tends to be uniform, and improving the uniformity of light emission.
In this embodiment, according to the specific arrangement manner of the trace 300, two, three or more first portions 800 may be included in one of the light emitting units, specifically referring to fig. 3, where one of the light emitting units includes 4 first portions 800.
In this embodiment, the display panel 100 further includes a light emitting layer located in the first opening 601, and the light emitting layer is electrically connected to the anode layer. The sum of the thickness of the first insulating unit 710 and the thickness of the first protrusion 510 is greater than or equal to the thickness of the light emitting layer, as shown in fig. 1 and 2. The first insulating unit 710 is used to disconnect the light emitting layer near the first insulating unit 710, the first insulating unit 710 is not covered with the light emitting layer, so as to avoid the connection of the light emitting layer at the first insulating unit 710, although the first insulating unit 710 blocks the connection between the light emitting layer on the first insulating layer and the anode layer, the light emitting layer on the first insulating layer may generate possible leakage or current passing with the surrounding light emitting layer, and the first insulating unit 710 disconnects the light emitting layer near the first insulating unit 710, thereby fundamentally ensuring that the thickness of the light emitting layer through which current passes tends to be uniform, and improving the uniformity of light emission.
In this embodiment, the display panel 100 includes a plurality of sub-pixel units, and one of the first openings 601 corresponds to one of the sub-pixel units.
In this embodiment, the first insulating unit 710 covers the first protrusion 510 and extends toward the edge of the first opening 601, please refer to fig. 2 specifically. The first insulating unit 710 completely covers the first protrusion 510 and overlaps the flat portion of the anode layer, so as to prevent the first insulating unit 710 from only covering part of the first protrusion 510, prevent the side surface of the first protrusion 510 from being communicated with the light-emitting layer and the cathode layer 520, prevent the thickness of the light-emitting layer of the communicated portion from being uneven, and prevent the light-emitting effect of the display panel 100 from being deteriorated.
In this embodiment, the thickness of the first insulating unit 710 gradually increases from the center of the first opening 601 to the edge of the first opening 601. The luminescent layer is in first dam body 610 corresponds there is the climbing phenomenon on the inner wall of first opening 601, will be close to first dam body 610 the thickness of first insulation unit 710 is thickened to avoid climbing the luminescent layer crosses first insulation unit 710 avoids on the first insulation layer the luminescent layer can with around the luminescent layer produces possible electric leakage or the electric current passes through, has fundamentally guaranteed that the thickness of the luminescent layer that has the electric current to pass through tends to the homogeneity, has improved luminous homogeneity.
According to the embodiment of the invention, the first insulating unit is arranged on the first protrusion on the anode layer in the pixel opening, so that the electrical connection between the luminescent material on the first protrusion of the anode and the first protrusion is prevented, the thickness uniformity of the effective luminescent unit is increased, the thickness of the luminescent layer through which current passes tends to be uniform, and the luminescent uniformity is improved.
Referring to fig. 5 and 6, an embodiment of the invention further provides a manufacturing method of the display panel 100, including:
s100, providing a substrate 200;
s200, forming an array substrate comprising a plurality of thin film transistors and a trace 300 connected with the thin film transistors on the substrate 200.
S300, forming a flat layer 400 on the routing layer;
s400, forming an anode layer comprising a plurality of anodes 500 on the flat layer 400, wherein at least one anode 500 comprises a substrate 501 and a first protrusion 510 positioned on the substrate 501;
s500, forming a pixel definition material layer on the anode layer;
s600, patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings 601 and a plurality of first insulating units 710;
s700, forming a light emitting layer in the first opening 601, where the light emitting layer includes a plurality of light emitting units, and each light emitting unit is located on the substrate 501 of the corresponding anode 500 and located in the corresponding first opening 601;
s800, forming a cathode layer 520 on the light emitting layer, wherein at least a portion of the cathode layer 520 is located in the plurality of first openings 601;
each of the first insulating units 710 is located on the corresponding first bump 510, at least one of the traces 300 corresponds to one of the first bumps 510, the light emitting unit includes two first portions 800 respectively located on two opposite sides of the corresponding first insulating unit 710, and both the first portions 800 are electrically connected to the corresponding anode 500 and the corresponding cathode layer 520.
According to the embodiment of the invention, the first insulating unit is arranged on the first protrusion on the anode layer in the pixel opening, so that the electrical connection between the luminescent material on the first protrusion of the anode and the first protrusion is prevented, the thickness uniformity of the effective luminescent unit is increased, and the luminescent uniformity is improved.
The technical solution of the present invention will now be described with reference to specific embodiments.
The manufacturing method of the display panel 100 includes:
s100, a substrate 200 is provided.
In this embodiment, the substrate 200 may be a flexible substrate 200 or a glass substrate 200, which is not limited herein.
S200, forming an array substrate comprising a plurality of thin film transistors and a trace 300 connected with the thin film transistors on the substrate 200.
And S300, forming a flat layer 400 on the routing layer.
In this embodiment, the planarization layer 400 includes a plurality of second bumps 410, and at least one of the traces 300 corresponds to one of the second bumps 410.
S400, forming an anode layer comprising a plurality of anodes 500 on the flat layer 400, wherein at least one anode 500 comprises a substrate 501 and a first protrusion 510 positioned on the substrate 501.
In this embodiment, at least one of the traces 300 corresponds to one of the first bumps 510. Since the arrangement of the trace 300 may cause the unevenness of the planarization layer 400 and the anode layer, one of the first bumps 510 corresponds to one of the second bumps 410, please refer to fig. 1.
And S500, forming a pixel definition material layer on the anode layer.
In this embodiment, the material of the pixel defining material layer may be a photoresist material, and the photoresist material may be a positive photoresist or a negative photoresist.
S600, patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings 601 and a plurality of first insulating units 710.
In the present embodiment, the first insulation unit 710 is located on the first bump 510, please refer to fig. 1 in detail.
In this embodiment, the anode layer is exposed by the first opening 601, so that the subsequent light emitting layer is electrically connected to the anode layer.
In this embodiment, step S600 includes:
s610a, the pixel defining material layer is patterned by using a halftone mask 900 to form a pixel defining layer including a plurality of first openings 601 and a plurality of first insulating units 710, as shown in fig. 6.
In this embodiment, the pixel definition layer further includes a first dam 610 surrounding the first opening 601, the halftone mask 900 includes a first transparent region 910, a second transparent region 920 and a third transparent region 930, the first transparent region 910 corresponds to the first opening 601, the second transparent region 920 corresponds to the first insulating unit 710, and the third transparent region 930 corresponds to the first dam 610 of the pixel definition layer, which is specifically shown in fig. 6.
In this embodiment, taking the material of the pixel defining material layer as a positive photoresist as an example, the first transparent region 910 is fully transparent and corresponds to the first opening 601 exposing the anode layer, the second transparent region 920 is semi-transparent and corresponds to the first insulating unit 710, and the third transparent region 930 is non-transparent and corresponds to the first dam 610, which is specifically shown in fig. 6.
In this embodiment, step S610a further includes: by using the halftone mask 900, a second insulating unit 720 is formed in the corresponding area of the second transparent area 920.
In this embodiment, step S600 includes:
s610b, patterning the pixel defining material layer by using the first mask and the second mask to form a plurality of first insulating units 710 and a pixel defining layer including a plurality of first openings 601 respectively.
In this embodiment, step S610b further includes: a second insulating unit 720 is simultaneously formed using the first mask.
In this embodiment, the first and second photomasks are ordinary photomasks, i.e., only non-light-transmissive and all-light-transmissive, and the halftone photomask 900 is replaced by a cheaper ordinary photomask by adjusting the exposure intensity of the exposure machine, and the first and second insulating units 710 and 720 and the first dam 610 are separately prepared by two photomasks.
In this embodiment, the insulating layer further includes a plurality of second insulating units 720, each of the second insulating units 720 is located between the corresponding substrate 501 of the anode 500 and the pixel defining layer, each of the light emitting layers further includes a slope 810, and the slope 810 is located on the second insulating unit 720. The pixel defining layer includes a first dam 610 surrounding the first opening 601, the pixel defining layer is replaced by the first dam 610, the second insulating unit 720 includes a second portion and a third portion connected to each other, the second portion is located between the anode layer and the first dam 610, the third portion is located in the first opening 601, and referring to fig. 2, the second portion and the third portion are easy to understand and have no reference number in the drawing. The printed light emitting layer may have a climbing phenomenon at the edge of the first opening 601, that is, on the inner wall of the first dam 610 corresponding to the first opening 601, for example, a slope 810 in fig. 2, which may cause the thickness of the light emitting layer near the first dam 610 to be non-uniform, thereby causing the light emitting effect of the display panel 100 to be poor, and even if there is the climbing phenomenon, the second insulating unit 720 is disposed between the inner wall of the first dam 610 corresponding to the first opening 601 and the anode layer, the second insulating unit 720 may block the current between the light emitting layer and the anode layer, so that the light emitting layer which climbs does not emit light, thereby improving the uniformity of light emission.
In this embodiment, the surface of the first insulating unit 710 away from the anode layer is flush with the surface of the second insulating unit 720 away from the anode layer. The light emitting layer can be better covered by a cathode layer 520, see fig. 4.
In this embodiment, the thickness of the second insulating unit 720 is the same as that of the first insulating unit 710, specifically referring to fig. 1 and fig. 2. The second insulating unit 720 and the first insulating unit 710 are fabricated in the same process, and the materials of the first insulating unit 710, the second insulating unit 720 and the pixel definition layer may be the same material, that is, when the pixel definition material is patterned and a mask is used for patterning, the transmittance of the mask corresponding to the second insulating unit 720 is the same as the transmittance of the mask corresponding to the first insulating unit 710, so the thickness of the second insulating unit 720 is the same as that of the first insulating unit 710, which is convenient for fabrication and simplifies the process.
In this embodiment, the thickness of the second insulating unit 720 is greater than that of the light emitting layer. The second insulating unit 720 can be disconnected when the light emitting layer is printed, so that the thickness of the light emitting layer through which current passes tends to be uniform, and the light emitting uniformity is improved.
In this embodiment, the second insulating unit 720 may be integrally disposed with the first dam 610, that is, only the third portion of the second insulating unit 720 extending to the first opening 601 remains.
In this embodiment, the materials of the first insulating unit 710, the second insulating unit 720 and the pixel defining layer are the same, insulating materials, and may be all photoresist materials, which may be positive photoresist or negative photoresist.
S700, forming a light emitting layer in the first opening 601, where the light emitting layer includes a plurality of light emitting units, and each light emitting unit is located on the substrate 501 of the corresponding anode 500 and located in the corresponding first opening 601.
In this embodiment, the light emitting unit includes two first portions 800 respectively located at two opposite sides of the corresponding first insulating unit 710, and both first portions 800 are electrically connected to the corresponding anode 500 and the corresponding cathode layer 520. The first portion 800 is an effective light emitting unit, and can electrically connect and conduct the corresponding anode 500 and the cathode layer 520 to perform uniform light emission.
S800, forming a cathode layer 520 on the light emitting layer, wherein at least a portion of the cathode layer 520 is located in the plurality of first openings 601.
In this embodiment, the display panel 100 includes a plurality of sub-pixel units, and one of the first openings 601 corresponds to one of the sub-pixel units.
In this embodiment, the first insulating unit 710 covers the first protrusion 510 and extends toward the edge of the first opening 601, please refer to fig. 2 specifically. The first insulating unit 710 completely covers the first protrusion 510 and overlaps the flat portion of the anode layer, so as to prevent the first insulating unit 710 from only covering part of the first protrusion 510, prevent the side surface of the first protrusion 510 from being communicated with the light-emitting layer and the cathode layer 520, prevent the thickness of the light-emitting layer of the communicated portion from being uneven, and prevent the light-emitting effect of the display panel 100 from being deteriorated.
In this embodiment, the thickness of the first insulating unit 710 gradually increases from the center of the first opening 601 to the edge of the first opening 601. The luminescent layer is in first dam body 610 corresponds there is the climbing phenomenon on the inner wall of first opening 601, will be close to first dam body 610 the thickness thickening of first insulation unit 710 to avoid climbing the luminescent layer is crossed first insulation unit 710 avoids on the first insulation layer the luminescent layer can with around the luminescent layer produces possible electric leakage or electric current and passes through, has fundamentally guaranteed that the thickness of the luminescent layer that has the electric current to pass through tends to the homogeneity, has improved luminous homogeneity.
In this embodiment, the display panel 100 further includes a substrate 200, an array substrate located on the substrate 200, a flat layer 400 located on the array substrate, the anode layer located on the flat layer 400, the pixel defining layer including a plurality of the first openings 601 located on the anode layer, the light emitting layer located in the first openings 601, and a cathode layer 520 located on the light emitting layer. The cathode layer 520 is disposed as a whole layer, please refer to fig. 4. The substrate 200 may be a flexible substrate 200 or a glass substrate 200, and is not limited herein.
In this embodiment, the array substrate includes a routing layer, the flat layer 400 is located between the routing layer and the anode layer, the routing layer includes a plurality of traces 300, and at least one of the traces 300 corresponds to one of the first protrusions 510. The planarization layer 400 includes a plurality of second bumps 410, one of the second bumps 410 corresponds to one of the first bumps 510, specifically referring to fig. 1 and 3, in fig. 3, the first insulating unit 710 is disposed on the wire 300, which is not shown. Due to the arrangement of the trace 300, the second protrusion 410 may be formed on the planar layer 400, and the first protrusion 510 may be formed on the anode layer, and the first insulation unit 710 is disposed on the first protrusion 510, so that the first protrusion 510 and the cathode layer 520 corresponding to the first protrusion 510 may be isolated from each other, and even if the luminescent material is printed on the first protrusion 510 (even if the first insulation unit 710), the luminescent material on the first insulation unit 710 may not emit light, thereby ensuring that the thickness of the luminescent layer through which current passes tends to be uniform, and improving the uniformity of light emission.
In this embodiment, according to the specific arrangement manner of the trace 300, two, three or more first portions 800 may be included in one of the light emitting units, specifically referring to fig. 3, where one of the light emitting units includes 4 first portions 800.
According to the embodiment of the invention, the first insulating unit is arranged on the first protrusion on the anode layer in the pixel opening, so that the electrical connection between the luminescent material on the first protrusion of the anode and the first protrusion is prevented, the thickness uniformity of the effective luminescent unit is increased, and the luminescent uniformity is improved.
The embodiment of the invention discloses a display panel and a manufacturing method thereof. The display panel includes: an anode layer including a plurality of anodes, at least one of the anodes including a substrate and a first projection on the substrate; a pixel defining layer on the anode layer and including multiple first openings, each exposing a corresponding anode; the insulating layer comprises a plurality of first insulating units, and each first insulating unit is positioned on the corresponding first bump; and the light-emitting layer comprises a plurality of light-emitting units, and each light-emitting unit is positioned on the substrate of the corresponding anode and positioned in the corresponding first opening. According to the embodiment of the invention, the first insulation unit is arranged on the first protrusion on the anode layer in the pixel opening, so that the electrical connection between the luminescent material on the first protrusion of the anode and the first protrusion is prevented, the thickness of the luminescent layer through which current passes tends to be uniform, and the luminescent uniformity is improved.
The display panel and the manufacturing method thereof provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained by applying a specific example herein, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as limiting the present invention.
Claims (10)
1. A display panel, comprising:
an anode layer comprising a plurality of anodes, at least one of said anodes comprising a substrate and a first projection on said substrate;
a pixel defining layer on the anode layer, including a plurality of first openings, each of which exposes a corresponding one of the anodes;
the insulating layer comprises a plurality of first insulating units, and each first insulating unit is positioned on the corresponding first bump;
a light emitting layer including a plurality of light emitting units, each of the light emitting units being located on the substrate of the corresponding anode and within the corresponding first opening;
the sum of the thickness of the first insulating unit and the thickness of the first bump is greater than or equal to the thickness of the light-emitting layer, and the light-emitting layer is not covered on the first insulating unit.
2. The display panel according to claim 1, further comprising a cathode layer over the light-emitting layer, at least a portion of the cathode layer being located within the plurality of first openings;
the light emitting unit comprises two first parts which are respectively positioned at two opposite sides of the first insulating unit, and the two first parts are electrically connected with the corresponding anode and the cathode layer.
3. The display panel according to claim 2, wherein the insulating layer further includes a plurality of second insulating units, each of the second insulating units being located between the base of the corresponding anode and the pixel defining layer, and each of the light emitting layers further includes a slope portion, the slope portion being located on the second insulating unit.
4. The display panel according to claim 3, wherein the first insulating unit, the second insulating unit, and the pixel defining layer are made of the same material.
5. The display panel according to claim 2, wherein the first portions have the same thickness and a flat surface.
6. The display panel according to claim 1, wherein the display panel further comprises an array substrate located on a side of the anode layer away from the pixel definition layer, the array substrate includes a plurality of thin film transistors and traces connected to the thin film transistors, and the first protrusion corresponds to at least one of the traces.
7. The display panel according to claim 1, wherein the first insulating unit covers the first protrusion and extends in a direction of an edge of the first opening.
8. A method for manufacturing a display panel is characterized by comprising the following steps:
providing a substrate;
forming an array substrate comprising a plurality of thin film transistors and wiring connected with the thin film transistors on the substrate;
forming a flat layer on the array substrate;
forming an anode layer including a plurality of anodes on the planarization layer, at least one of the anodes including a base and a first protrusion on the base;
forming a pixel defining material layer on the anode layer;
patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings and a plurality of first insulating units;
forming a light-emitting layer in the first opening, wherein the light-emitting layer includes a plurality of light-emitting units, each light-emitting unit is located on the substrate of the corresponding anode and located in the corresponding first opening, the sum of the thickness of the first insulating unit and the thickness of the first protrusion is greater than or equal to the thickness of the light-emitting layer, and the light-emitting layer is not covered on the first insulating unit;
forming a cathode layer on the light emitting layer, at least a portion of the cathode layer being located within the plurality of first openings;
each first insulating unit is located on the corresponding first protrusion, at least one wire corresponds to one first protrusion, the light emitting unit comprises two first parts respectively located on two opposite sides of the first insulating unit, and the two first parts are electrically connected to the corresponding anode and the corresponding cathode layer.
9. The method according to claim 8, wherein the step of patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings and a plurality of first insulating units comprises:
patterning the pixel defining material layer by using a half-tone photomask to form a pixel defining layer comprising a plurality of first openings and a plurality of first insulating units;
the pixel definition layer further comprises a first dam surrounding the first opening, the halftone mask comprises a first light-transmitting area, a second light-transmitting area and a third light-transmitting area, the first light-transmitting area corresponds to the first opening, the second light-transmitting area corresponds to the first insulating unit, and the third light-transmitting area corresponds to the first dam of the pixel definition layer.
10. The method according to claim 8, wherein the step of patterning the pixel defining material layer to form a pixel defining layer including a plurality of first openings and a plurality of first insulating units comprises:
the pixel definition material layer is patterned by using a first photomask and a second photomask to respectively form a plurality of first insulating units and a pixel definition layer comprising a plurality of first openings correspondingly.
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| CN107863449A (en) * | 2017-10-26 | 2018-03-30 | 京东方科技集团股份有限公司 | A kind of organic electroluminescence device, its preparation method and display device |
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