CN113745428A - Display panel and mobile terminal - Google Patents
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- CN113745428A CN113745428A CN202110967725.8A CN202110967725A CN113745428A CN 113745428 A CN113745428 A CN 113745428A CN 202110967725 A CN202110967725 A CN 202110967725A CN 113745428 A CN113745428 A CN 113745428A
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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- H10K50/80—Constructional details
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- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
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Abstract
The embodiment of the application provides a display panel and a mobile terminal; the display panel includes a first light emitting unit and a second light emitting unit; the first light-emitting unit comprises a first anode, a first microcavity adjusting layer and a first light-emitting device, the second light-emitting unit comprises a second anode, a second microcavity adjusting layer and a second light-emitting device, the distance between the light-emitting center of the first light-emitting device and the first anode is larger than the distance between the light-emitting center of the second light-emitting device and the second anode, and the volumes of the first microcavity adjusting layer and the second microcavity adjusting layer are equal; the display panel has the advantages that the volume of the microcavity adjusting materials arranged in the light emitting units with different microcavity lengths is the same, so that the microcavity adjusting materials with the same quantity are jetted to each light emitting unit simultaneously in an ink jetting process to form the light emitting units with different microcavity lengths, the ink jetting process is only needed once, the process is simple, the number of light shades is reduced, and the production efficiency of the display panel is improved while the luminous efficiency of different-color light emitting devices is improved.
Description
Technical Field
The invention relates to the field of display, in particular to a display panel and a mobile terminal.
Background
In the current OLED (Organic Light-Emitting Diode) display panel, the color saturation of the emitted Light and the Light-Emitting efficiency of the device can be enhanced by using the resonant cavity effect. For example, for light emitting devices of different colors, the light emission of an OLED display panel is generally enhanced by using a microcavity structure, wherein the microcavity structure is a structure between a semitransparent cathode and a reflective electrode of the OLED. However, since the light emitting devices of different colors have different light emitting efficiencies, the microcavity lengths required for the OLED devices of different colors may vary. In the current manufacturing process, different masks are used to evaporate the micro-cavity adjusting material before the evaporation of the R/G/B three-color luminescent material layer, and three mask evaporation processes are required, so that the process is complicated.
Therefore, a display panel and a mobile terminal are needed to solve the above technical problems.
Disclosure of Invention
The embodiment of the invention provides a display panel and a mobile terminal, which can solve the technical problem of complex and fussy process when a microcavity adjusting material in an OLED display panel is prepared in the prior art.
The embodiment of the invention provides a display panel, which comprises a plurality of first light-emitting units for emitting first color light and a plurality of second light-emitting units for emitting second color light;
the first light-emitting unit comprises a first anode, a first micro-cavity adjusting layer positioned on the first anode and a first light-emitting device positioned on the first micro-cavity adjusting layer, and the second light-emitting unit comprises a second anode, a second micro-cavity adjusting layer positioned on the second anode and a second light-emitting device positioned on the second micro-cavity adjusting layer;
the first distance between the light emitting center of the first light emitting device and the first anode is larger than the second distance between the light emitting center of the second light emitting device and the second anode, and the volumes of the first micro-cavity adjusting layer and the second micro-cavity adjusting layer are equal.
Optionally, in some embodiments of the present application, a thickness of the first anode is greater than a thickness of the second anode.
Optionally, in some embodiments of the present application, the second anode is provided with at least one groove thereon, and the second microcavity adjusting layer covers the groove.
Optionally, in some embodiments of the present application, the depth of the groove is less than the thickness of the second anode.
Optionally, in some embodiments of the present application, the display panel further includes a plurality of third light emitting units emitting third color light, and a light emitting area of the third light emitting unit is larger than a light emitting area of the first light emitting unit or the second light emitting unit.
Optionally, in some embodiments of the present application, a light emitting area of the second light emitting unit is larger than a light emitting area of the first light emitting unit.
Optionally, in some embodiments of the present application, the light emitting intensity of the second light emitting unit is greater than the light emitting intensity of the first light emitting unit, and the thickness of the second light emitting unit is smaller than the thickness of the first light emitting unit.
Optionally, in some embodiments of the present application, each of the first anode and the second anode includes a first ito layer, a silver metal layer disposed on the first ito layer, and a second ito layer disposed on the silver metal layer;
wherein a distance between the light emitting center of the first light emitting device and the silver metal layer is larger than a distance between the light emitting center of the second light emitting device and the silver metal layer.
Optionally, in some embodiments of the present application, the materials of the first and second microcavity adjusting layers include at least one of an organic light emitting material, a hole injecting material, a hole transporting material, an electron injecting material, and an electron transporting material.
Correspondingly, the embodiment of the application also provides a mobile terminal, which comprises a terminal main body and the display panel, wherein the terminal main body and the display panel are combined into a whole
The embodiment of the application provides a display panel and a mobile terminal; the display panel comprises a plurality of first light-emitting units for emitting light of a first color and a plurality of second light-emitting units for emitting light of a second color; the first light-emitting unit comprises a first anode, a first microcavity adjusting layer positioned on the first anode and a first light-emitting device positioned on the first microcavity adjusting layer, the second light-emitting unit comprises a second anode, a second microcavity adjusting layer positioned on the second anode and a second light-emitting device positioned on the second microcavity adjusting layer, wherein a first distance between a light-emitting center of the first light-emitting device and the first anode is larger than a second distance between a light-emitting center of the second light-emitting device and the second anode, and the volumes of the first microcavity adjusting layer and the second microcavity adjusting layer are equal; the display panel has the advantages that the volume of the microcavity adjusting materials arranged in the light emitting units with different microcavity lengths is the same, so that the microcavity adjusting materials with the same quantity are jetted to each light emitting unit simultaneously in an ink jetting process to form the light emitting units with different microcavity lengths, the ink jetting process is only needed once, the process is simple, the number of light shades is reduced, and the production efficiency of the display panel is improved while the luminous efficiency of different-color light emitting devices 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 cross-sectional structure diagram of a display panel according to a first embodiment of the present application;
fig. 2 is a schematic cross-sectional structure diagram of a display panel according to a second embodiment of the present application;
fig. 3 is a schematic cross-sectional structure diagram of a display panel according to a third embodiment of the present application;
fig. 4 is a schematic cross-sectional structure diagram of a display panel provided in a fourth embodiment of the present application;
fig. 5 is a schematic cross-sectional structure diagram of a display panel provided in a fifth embodiment of the present application;
FIG. 6 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention;
fig. 7A to 7F are schematic structural diagrams of 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are 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.
The embodiment of the application aims at the technical problem that the process is complex and tedious when the microcavity adjusting material in the display panel is prepared in the prior art, and the embodiment of the application can improve the technical problem.
The technical solution of the present application will now be described with reference to specific embodiments.
Referring to fig. 1 to 5, an embodiment of the present application provides a display panel 10, where the display panel 10 includes a plurality of first light emitting units 131 emitting light of a first color and a plurality of second light emitting units 132 emitting light of a second color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152;
wherein a first interval between the emission center of the first light emitting device 161 and the first anode 141 is greater than a second interval between the emission center of the second light emitting device 162 and the second anode 142, and the first and second microcavity adjusting layers 151 and 152 have the same volume.
The display panel 10 provided by the embodiment of the application has the advantages that the volume of the microcavity regulating material arranged in the light emitting units with different microcavity lengths is the same, so that the microcavity regulating material with the same amount is jetted to each light emitting unit simultaneously in the ink jetting process to form the light emitting units with different microcavity lengths, the ink jetting process is only needed once, the process is simple, the number of light shades is reduced, the light emitting efficiency of different color light emitting devices is improved, and the production efficiency of the display panel 10 is improved.
The technical solution of the present application will now be described with reference to specific embodiments.
Example one
Fig. 1 is a schematic cross-sectional view of a display panel 10 according to a first embodiment of the present application; the display panel 10 includes a plurality of first light emitting units 131 for emitting light of a first color, a plurality of second light emitting units 132 for emitting light of a second color, and a plurality of third light emitting units 133 for emitting light of a third color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152; the third light emitting unit 133 includes a third anode 143, a third microcavity adjusting layer 153 on the third anode 143, and a third light emitting device 163 on the third microcavity adjusting layer 153;
wherein a first distance between the emission center of the first light emitting device 161 and the first anode 141 is greater than a second distance between the emission center of the second light emitting device 162 and the second anode 142, and a second distance between the emission center of the second light emitting device 162 and the second anode 142 is greater than a third distance between the emission center of the third light emitting device 163 and the third anode 143; the first, second, and third microcavity adjusting layers 151, 152, and 153 have the same volume.
Specifically, the display panel 10 includes a substrate 11, an array structure layer 12 disposed on the substrate 11, a pixel definition layer 17 disposed on the array structure layer 12, and a cathode layer 18 disposed on the array structure layer 12. The pixel defining layer 17 defines a first opening, a second opening and a third opening, the first light emitting unit 131 is disposed in the first opening, the second light emitting unit 132 is disposed in the second opening, and the third light emitting unit 133 is disposed in the third opening.
Further, the cathode layer 18 completely covers the first light emitting device 161, the second light emitting device 162, and the third light emitting device 163.
In the embodiment of the present application, the first light emitting unit 131 emits red light, the second light emitting unit 132 emits green light, and the third light emitting unit 133 emits blue light.
In this embodiment of the application, the base 11 is a flexible substrate, and the base 11 specifically includes a first flexible layer, a barrier layer disposed on the first flexible layer, and a second flexible layer disposed on the barrier layer. The material of the first flexible layer and the material of the second flexible layer are preferably polyimide, and the material of the barrier layer is preferably silicide nitride or oxynitride.
In the embodiment of the present application, the array structure layer 12 includes a plurality of thin film transistors. The thin film transistor is used for driving the first light emitting unit 131, the second light emitting unit 132 and the third light emitting unit 133 to emit light; the thin film transistor may be of an etching barrier type, a back channel etching type, or a top gate thin film transistor type, and the like, and is not particularly limited.
In the embodiment of the present application, the thickness of the first anode 141, the thickness of the second anode 142, and the thickness of the third anode 143 are the same.
In the embodiment of the present application, the light emitting areas of the first light emitting unit 131, the second light emitting unit 132, and the third light emitting unit 133 are the same; wherein the light emitting intensity of the second light emitting device 162 is greater than the light emitting intensity of the first light emitting device 161, and the light emitting intensity of the first light emitting device 161 is greater than the light emitting intensity of the third light emitting device 163.
Further, the thickness of the second light emitting device 162 is smaller than that of the first light emitting device 161, and the thickness of the third light emitting device 163 is smaller than that of the first light emitting device 161.
In the embodiment of the present application, each of the first anode 141, the second anode 142, and the third anode 143 includes a first ito layer, a ag metal layer disposed on the first ito layer, and a second ito layer disposed on the ag metal layer;
wherein a distance between the light emission center of the first light emitting device 161 and the silver metal layer is greater than a distance between the light emission center of the second light emitting device 162 and the silver metal layer.
In the embodiment, the first light emitting device 161 includes a hole injection layer disposed on the first anode 141, a hole transport layer disposed on the hole injection layer, a red organic light emitting layer disposed on the hole transport layer, an electron injection layer disposed on the red organic light emitting layer, and an electron transport layer disposed on the electron injection layer; the second light emitting device 162 includes a hole injection layer disposed on the second anode 142, a hole transport layer disposed on the hole injection layer, a green organic light emitting layer disposed on the hole transport layer, an electron injection layer disposed on the green organic light emitting layer, and an electron transport layer disposed on the electron injection layer; the third light emitting device 163 includes a hole injection layer disposed on the first anode 141, a hole transport layer disposed on the hole injection layer, a blue organic light emitting layer disposed on the hole transport layer, an electron injection layer disposed on the blue organic light emitting layer, and an electron transport layer disposed on the electron injection layer.
Further, the first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 may be film layers independent of the red organic light emitting layer, the green organic light emitting layer, the blue organic light emitting layer, the hole injection layer, the hole transport layer, the electron injection layer, and the electron transport layer. Or, the first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 may be selected from any one or more of the red organic light emitting layer, the green organic light emitting layer, the blue organic light emitting layer, the hole injection layer, the hole transport layer, the electron injection layer, and the electron transport layer. Preferably, the materials of the first, second, and third microcavity adjusting layers 151, 152, and 153 include at least one of a hole injection material and a hole transport material.
Further, the red organic light emitting layer, the green organic light emitting layer and the blue organic light emitting layer are formed by quantum dot light emitting ink; the electron injection layer or the electron transport layer comprises metal oxide nanocrystals, and the metal oxide nanocrystals comprise at least one of zinc oxide, zinc oxide doped with one or more of magnesium, aluminum and lithium, titanium dioxide and tin dioxide.
In the embodiment of the present application, the hole transport layer may be selected from organic materials having a hole transport ability, and may be, but not limited to, N ' -diphenyl-N, N ' - (1-naphthyl) -1,1 ' -biphenyl-4, 4' -diamine (NPB), N ' -diphenyl-N, N ' -bis (3-methylphenyl) -1,1 ' -biphenyl-4, 4' -diamine (TPD), poly (N, N ' -bis (4-butylphenyl) -N, N ' -bis (phenyl) benzidine) (poly-TPD), poly (9, 9-dioctylfluorene-CO-N- (4-butylphenyl) diphenylamine) (TFB), Polyvinylcarbazole (PVK), 4' -bis (9-Carbazole) Biphenyl (CBP), 4,4', 4 "-tris (carbazol-9-yl) triphenylamine (TCTA), poly (9, 9-dioctylfluorene-co-bis-N, N-phenyl-1, 4-Phenylenediamine) (PFB), or mixtures thereof.
In the embodiment of the application, the material of the hole injection layer is PEDOT, PSS, CuPc, F4-TCNQ, HATCN, molybdenum oxide, vanadium oxide, tungsten oxide, chromium oxide, MoS2、WS2、MoSe2、WSe2One or more of (a).
In the embodiment of the present application, the material of the pixel defining layer 17 is an organic photoresist; the cathode layer 18 is made of a high-conductivity metal film such as Al or Ag.
In the embodiment of the present application, at least one first groove 1421 is disposed on the second anode 142, the second microcavity adjusting layer 152 covers the first groove 1421, at least one second groove 1431 is disposed on the third anode 143, and the third microcavity adjusting layer 153 covers the second groove 1431; wherein the depth of the first groove 1421 is the same as the depth of the second groove 1431, and the cross-sectional area of the second groove 1431 in the orthogonal projection direction of the array structure layer 12 is larger than the cross-sectional area of the first groove 1421 in the orthogonal projection direction of the array structure layer 12.
Further, the depth of the first groove 1421 or the second groove 1431 is the same as the thickness of the first anode 141.
In the embodiment of the present application, because the wavelengths of the light rays with different colors are different, in order to enhance the light emitting effect of the display panel 10 to the maximum extent, the lengths of the micro-cavities required by the light emitting units with different colors are different; the microcavity length refers to a length from a center of the light emitting device to a reflective layer in an anode, in order to maximize the light emitting efficiency of the display panel 10, the microcavity length of the first light emitting unit 131 is greater than the microcavity length of the second light emitting unit 132, and the microcavity length of the second light emitting unit 132 is greater than the microcavity length of the third light emitting unit 133.
Accordingly, after the first anode 141, the second anode 142, and the third anode 143 are formed, at least one first groove 1421 is formed on the second anode 142 in the second light emitting unit 132 having a relatively small microcavity length, and at least one second groove 1431 is formed on the third anode 143 in the third light emitting unit 133 having a smaller microcavity length; since the length of the microcavity corresponding to the third light emitting unit 133 is smaller than the length of the microcavity corresponding to the second light emitting unit 132, when the depth of the first groove 1421 is the same as the depth of the second groove 1431, the cross-sectional area of the second groove 1431 in the orthogonal projection direction of the array structure layer 12 is larger than the cross-sectional area of the first groove 1421 in the orthogonal projection direction of the array structure layer 12.
Then, in one inkjet process, the same amount of microcavity adjusting material is inkjet jetted into each light emitting unit, the microcavity adjusting material corresponding to the second microcavity adjusting layer 152 flows into the first recess 1421 on the second anode 142, and the microcavity adjusting material corresponding to the third microcavity adjusting layer 153 flows into the third recess on the third anode 143, so that the lengths of the microcavities of the second light emitting unit 132 and the third light emitting unit 133 are respectively adjusted under the condition that the volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152 and the third microcavity adjusting layer 153 are equal, and only one inkjet process is needed, the process is simple, the number of masks is reduced, and the production efficiency can be greatly improved.
Because the thickness of the anode is micrometer unit and the thickness unit of the microcavity regulating layer is angstrom, the grooves with different cross-sectional areas can regulate the thickness of the microcavity regulating layer corresponding to different light-emitting units without influencing the normal light-emitting display of the sub-pixels with different colors.
In order to solve the technical problem of uneven leveling after the micro-cavity regulating material is jetted in a primary ink-jet process, in some embodiments, a plurality of first grooves 1421 are disposed on the first anode 141, and a plurality of second grooves 1431 are disposed on the second anode 142; the arrangement can enable the micro-cavity regulating material to be better and uniformly leveled after ink is jetted.
In order to solve the technical problem of complex and tedious process when the microcavity adjusting material in the display panel 10 is prepared in the prior art, the first embodiment of the present application provides a display panel 10, where the display panel 10 includes a plurality of first light-emitting units 131 emitting light of a first color, a plurality of second light-emitting units 132 emitting light of a second color, and a plurality of third light-emitting units 133 emitting light of a third color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152; the third light emitting unit 133 includes a third anode 143, a third microcavity adjusting layer 153 on the third anode 143, and a third light emitting device 163 on the third microcavity adjusting layer 153, wherein a first interval between the emission center of the first light emitting device 161 and the first anode 141 is greater than a second interval between the emission center of the second light emitting device 162 and the second anode 142, and a second interval between the emission center of the second light emitting device 162 and the second anode 142 is greater than a third interval between the emission center of the third light emitting device 163 and the third anode 143; meanwhile, at least one first groove 1421 is disposed on the second anode 142, the second microcavity adjusting layer 152 covers the first groove 1421, at least one second groove 1431 is disposed on the third anode 143, the third microcavity adjusting layer 153 covers the second groove 1431, the depth of the first groove 1421 is the same as that of the second groove 1431, and the cross-sectional area of the second groove 1431 in the orthogonal projection direction of the array structure layer 12 is larger than that of the first groove 1421 in the orthogonal projection direction of the array structure layer 12, so that the volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152 and the third microcavity adjusting layer 153 are equal; the volume of the microcavity regulating material arranged in the light-emitting units with different microcavity lengths is the same, so that the microcavity regulating material with the same amount is jetted to each light-emitting unit simultaneously in the same ink jet process to form the light-emitting units with different microcavity lengths, the ink jet process is only needed once, the process is simple, the number of light shades is reduced, and the production efficiency of the display panel 10 is improved while the light-emitting efficiency of different-color light-emitting devices is improved.
Example two
As shown in fig. 2, a cross-sectional structure diagram of a display panel 10 according to a second embodiment of the present application is provided; the structure of the display panel 10 in the second embodiment of the present application is the same as or similar to that in the first embodiment of the present application, except that the thickness of the first anode 141 is greater than that of the second anode 142, the thickness of the second anode 142 is greater than that of the third anode 143, and neither the second anode 142 nor the third anode 143 has a groove.
The second embodiment of the present application makes the first microcavity adjusting layer 151, the second microcavity adjusting layer 152 and the third microcavity adjusting layer 153 have equal volumes by adjusting the thicknesses of the anodes corresponding to different light-emitting units, so that the light-emitting units with different microcavity lengths can be formed. Compared with the first embodiment, the second embodiment of the application is simple to operate, does not need to be grooved, and has more advantages.
In order to solve the technical problem of complex and tedious process when the microcavity adjusting material in the display panel 10 is prepared in the prior art, the second embodiment of the present application provides a display panel 10, where the display panel 10 includes a plurality of first light-emitting units 131 for emitting light of a first color, a plurality of second light-emitting units 132 for emitting light of a second color, and a plurality of third light-emitting units 133 for emitting light of a third color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152; the third light emitting unit 133 includes a third anode 143, a third microcavity adjusting layer 153 on the third anode 143, and a third light emitting device 163 on the third microcavity adjusting layer 153, wherein a first interval between the emission center of the first light emitting device 161 and the first anode 141 is greater than a second interval between the emission center of the second light emitting device 162 and the second anode 142, and a second interval between the emission center of the second light emitting device 162 and the second anode 142 is greater than a third interval between the emission center of the third light emitting device 163 and the third anode 143; meanwhile, the thickness of the first anode 141 is greater than that of the second anode 142, and the thickness of the second anode 142 is greater than that of the third anode 143; equalizing the volumes of the first, second, and third microcavity adjusting layers 151, 152, and 153; the volume of the microcavity regulating material arranged in the light-emitting units with different microcavity lengths is the same, so that the microcavity regulating material with the same amount is jetted to each light-emitting unit simultaneously in the same ink jet process to form the light-emitting units with different microcavity lengths, only one ink jet process is needed, grooving is not needed, the process is simple, the number of light shades is reduced, and the production efficiency of the display panel 10 is improved while the light-emitting efficiency of different color light-emitting devices is improved.
EXAMPLE III
As shown in fig. 3, a cross-sectional structure diagram of a display panel 10 according to a third embodiment of the present application is provided; the structure of the display panel 10 in the third embodiment of the present application is the same as or similar to the structure in the first embodiment of the present application, except that the depth of the first groove 1421 is smaller than the thickness of the first anode 141, the depth of the first groove 1421 is the same as the depth of the second groove 1431, and the cross-sectional area of the third groove in the orthogonal projection direction of the array structure layer 12 is larger than the cross-sectional area of the second groove 1431 in the orthogonal projection direction of the array structure layer 12.
Further, since the second anode 142 and the third anode 143 each include a first ito layer, a silver metal layer disposed on the first ito layer, and a second ito layer disposed on the silver metal layer; therefore, when the first recess 1421 or the second recess 1431 is prepared, only the upper second ito layer and the silver metal layer may be hollowed out to leave the lower first ito layer, or the lower silver metal layer and the lower first ito layer may be hollowed out to leave the upper second ito layer.
Alternatively, when the first recess 1421 or the second recess 1431 is prepared, only the upper layer of the second ito layer may be hollowed out to leave the lower layer of the silver metal layer and the first ito layer, or the lower layer of the first ito layer may be hollowed out to leave the upper layer of the silver metal layer and the second ito layer.
In the third embodiment of the present application, the plurality of grooves are formed in the anode, and the depth of the grooves is smaller than the thickness of the anode, so that the volume of the first microcavity adjusting layer 151, the volume of the second microcavity adjusting layer 152 and the volume of the third microcavity adjusting layer 153 are equal to each other, thereby forming the light emitting units with different microcavity lengths.
In order to solve the technical problem of complex and tedious process when the microcavity adjusting material in the display panel 10 is prepared in the prior art, the third embodiment of the present application provides a display panel 10, where the display panel 10 includes a plurality of first light-emitting units 131 for emitting light of a first color, a plurality of second light-emitting units 132 for emitting light of a second color, and a plurality of third light-emitting units 133 for emitting light of a third color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152; the third light emitting unit 133 includes a third anode 143, a third microcavity adjusting layer 153 on the third anode 143, and a third light emitting device 163 on the third microcavity adjusting layer 153, wherein a first interval between the emission center of the first light emitting device 161 and the first anode 141 is greater than a second interval between the emission center of the second light emitting device 162 and the second anode 142, and a second interval between the emission center of the second light emitting device 162 and the second anode 142 is greater than a third interval between the emission center of the third light emitting device 163 and the third anode 143; meanwhile, at least one first groove 1421 is disposed on the second anode 142, the second microcavity adjusting layer 152 covers the first groove 1421, at least one second groove 1431 is disposed on the third anode 143, the third microcavity adjusting layer 153 covers the second groove 1431, a depth of the first groove 1421 is smaller than a thickness of the first anode 141, a depth of the first groove 1421 is the same as a depth of the second groove 1431, and a cross-sectional area of the second groove 1431 in a forward projection direction of the array structure layer 12 is larger than a cross-sectional area of the first groove 1421 in the forward projection direction of the array structure layer 12, so that volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 are equal; in the display panel 10, the volumes of the microcavity regulating materials disposed in the light-emitting units with different microcavity lengths are the same, so that the same amount of microcavity regulating material is simultaneously jetted to each light-emitting unit in the same ink jetting process, thereby forming the light-emitting units with different microcavity lengths. Compared with the first embodiment of the present application, the third embodiment of the present application has no influence on the light emitting units of different colors, and only one-time ink jet process is needed, so that the process is simple, the number of the light covers is reduced, and the production efficiency of the display panel 10 is improved while the light emitting efficiency of the light emitting devices of different colors is improved.
Example four
As shown in fig. 4, a cross-sectional structure diagram of a display panel 10 according to a fourth embodiment of the present application is provided; the structure of the display panel 10 in the fourth embodiment of the present application is the same as or similar to that in the first embodiment of the present application, except that the light emitting area of the second light emitting unit 132 is larger than that of the first light emitting unit 131, the light emitting area of the third light emitting unit 133 is larger than that of the second light emitting unit 132, and no groove structure is disposed on the anode layer.
The width L2 of the light-emitting region where the second light-emitting unit 132 is located is greater than the width L1 of the light-emitting region where the first light-emitting unit 131 is located, and the width L3 of the light-emitting region where the third light-emitting unit 133 is located is greater than the width L2 of the light-emitting region where the second light-emitting unit 132 is located. The width of the light emitting region where the light emitting unit is located refers to the length between the top centers of two adjacent pixel defining layers 17.
In the fourth embodiment of the present invention, the pixel defining layer 17 is disposed on the anode, and the pixel defining layer 17 has a plurality of opening structures with different widths, so that the volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152 and the third microcavity adjusting layer 153 are equal, thereby forming light emitting units with different microcavity lengths.
In order to solve the technical problem of complex and tedious process when the microcavity adjusting material in the display panel 10 is prepared in the prior art, the fourth embodiment of the present application provides a display panel 10, where the display panel 10 includes a plurality of first light-emitting units 131 for emitting light of a first color, a plurality of second light-emitting units 132 for emitting light of a second color, and a plurality of third light-emitting units 133 for emitting light of a third color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152; the third light emitting unit 133 includes a third anode 143, a third microcavity adjusting layer 153 on the third anode 143, and a third light emitting device 163 on the third microcavity adjusting layer 153, wherein a first interval between the emission center of the first light emitting device 161 and the first anode 141 is greater than a second interval between the emission center of the second light emitting device 162 and the second anode 142, and a second interval between the emission center of the second light emitting device 162 and the second anode 142 is greater than a third interval between the emission center of the third light emitting device 163 and the third anode 143; meanwhile, the light emitting area of the second light emitting unit 132 is larger than that of the first light emitting unit 131, and the light emitting area of the third light emitting unit 133 is larger than that of the second light emitting unit 132, so that the volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 are equal; in the display panel 10, the volumes of the microcavity regulating materials disposed in the light-emitting units with different microcavity lengths are the same, so that the same amount of microcavity regulating material is simultaneously jetted to each light-emitting unit in the same ink jetting process, thereby forming the light-emitting units with different microcavity lengths. Compared with the first embodiment of the present application, the fourth embodiment of the present application has no influence on the light emitting units of different colors, and simultaneously, only one time of ink jet process is needed, so that the process is simple, the number of the light covers is reduced, and the production efficiency of the display panel 10 is improved while the light emitting efficiency of the light emitting devices of different colors is improved.
EXAMPLE five
As shown in fig. 5, a cross-sectional structure diagram of a display panel 10 according to a fifth embodiment of the present application is provided; the structure of the display panel 10 in the fifth embodiment of the present application is the same as or similar to the structure of the fourth embodiment of the present application, except that the light emitting area of the second light emitting unit 132 is larger than the light emitting area of the first light emitting unit 131, the light emitting area of the third light emitting unit 133 is equal to the light emitting area of the first light emitting unit 131, at least one second groove 1431 is disposed on the third anode 143, and the third microcavity adjusting layer 153 covers the second groove 1431.
The above arrangement of the fifth embodiment of the present application makes the light emitting area of the second light emitting unit 132 larger than the light emitting area of the first light emitting unit 131 or the third light emitting unit 133, and at the same time, the third anode 143 is provided with at least one second groove 1431, and the third microcavity adjusting layer 153 covers the second groove 1431, so that the volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 are equal, thereby forming light emitting units with different microcavity lengths.
In order to solve the technical problem of complex and tedious process when the microcavity adjusting material in the display panel 10 is prepared in the prior art, the fourth embodiment of the present application provides a display panel 10, where the display panel 10 includes a plurality of first light-emitting units 131 for emitting light of a first color, a plurality of second light-emitting units 132 for emitting light of a second color, and a plurality of third light-emitting units 133 for emitting light of a third color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152; the third light emitting unit 133 includes a third anode 143, a third microcavity adjusting layer 153 on the third anode 143, and a third light emitting device 163 on the third microcavity adjusting layer 153, wherein a first interval between the emission center of the first light emitting device 161 and the first anode 141 is greater than a second interval between the emission center of the second light emitting device 162 and the second anode 142, and a second interval between the emission center of the second light emitting device 162 and the second anode 142 is greater than a third interval between the emission center of the third light emitting device 163 and the third anode 143; meanwhile, the light emitting area of the second light emitting unit 132 is larger than the light emitting area of the first light emitting unit 131, the light emitting area of the third light emitting unit 133 is equal to the light emitting area of the first light emitting unit 131, at least one second groove 1431 is disposed on the third anode 143, and the third microcavity adjusting layer 153 covers the second groove 1431, so that the volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 are equal; in the display panel 10, the volumes of the microcavity regulating materials disposed in the light-emitting units with different microcavity lengths are the same, so that the same amount of microcavity regulating material is simultaneously jetted to each light-emitting unit in the same ink jetting process, thereby forming the light-emitting units with different microcavity lengths. This application fifth embodiment compares this application embodiment four, and the luminescence unit to every different colours does not have any influence, only needs the ink jet technology once simultaneously, only needs the fluting on the positive pole that the luminescence unit of a colour corresponds, and simple process has reduced light cover quantity, when making the luminous efficacy of different colour luminescent device improve, has promoted display panel 10's production efficiency.
As shown in fig. 6, the present embodiment provides a manufacturing method of a display panel 10, and the manufacturing method of the display panel 10 is applied to the display panel 10 according to any one of the first to fifth embodiments of the present application, which is now described by way of example.
The manufacturing method of the display panel 10 provided in this embodiment specifically includes:
s10, forming an array structure layer 12 on a substrate 11.
Specifically, the S10 further includes:
first, a substrate 11 is provided, and an array structure layer 12 is formed on the substrate 11, as shown in fig. 7A. The base 11 is a flexible substrate, and the base 11 specifically includes a first flexible layer, a barrier layer disposed on the first flexible layer, and a second flexible layer disposed on the barrier layer. The material of the first flexible layer and the material of the second flexible layer are preferably polyimide, and the material of the barrier layer is preferably silicide nitride or oxynitride. The array structure layer 12 includes a plurality of thin film transistors. The thin film transistor is used for driving the first light emitting unit 131, the second light emitting unit 132 and the third light emitting unit 133 to emit light; the thin film transistor may be of an etching barrier type, a back channel etching type, or a top gate thin film transistor type, and the like, and is not particularly limited.
S20, preparing a first metal layer on the array structure layer 12, wherein the first metal layer is patterned to form a first anode 141, a second anode 142 and a third anode 143, wherein the second anode 142 is provided with at least one first groove 1421, and the third anode 143 is provided with at least one second groove 1431.
Specifically, the S20 further includes:
first, a first metal layer is deposited on the array structure layer 12 by using a physical vapor deposition process, and the first metal layer is subjected to photolithography, etching, and the like to form a patterned first anode 141, a patterned second anode 142, and a patterned third anode 143, wherein the second anode 142 is provided with at least one first groove 1421, and the third anode 143 is provided with at least one second groove 1431, as shown in fig. 7B.
Specifically, the thickness of the first anode 141, the thickness of the second anode 142, and the thickness of the third anode 143 are the same. The first anode 141, the second anode 142 and the third anode 143 each include a first ito layer, a ag metal layer disposed on the first ito layer, and a second ito layer disposed on the ag metal layer;
in the embodiment of the present application, the depth of the first groove 1421 is the same as the depth of the second groove 1431, and the cross-sectional area of the second groove 1431 in the orthogonal projection direction of the array structure layer 12 is larger than the cross-sectional area of the first groove 1421 in the orthogonal projection direction of the array structure layer 12.
Further, the depth of the first groove 1421 or the second groove 1431 is the same as the thickness of the first anode 141.
S30, preparing a pixel defining layer 17 on the array structure layer 12, wherein the pixel defining layer 17 has a first opening, a second opening and a third opening.
Specifically, the S30 further includes:
first, a pixel defining layer 17 is deposited on the array structure layer 12 by using a chemical vapor deposition process, the pixel defining layer 17 has a first opening, a second opening and a third opening, the first anode 141 is disposed in the first opening, the second anode 142 is disposed in the second opening, and the third anode 143 is disposed in the third opening, as shown in fig. 7C.
Further, in the embodiment of the present application, the pixel defining layer 17 does not cover the first groove 1421 and the second groove 1431; in other embodiments of the present application, the pixel defining layer 17 does not completely cover the first recess 1421 or the second recess 1431.
In the embodiment of the present application, the material of the pixel defining layer 17 includes an organic photoresist.
And S40, respectively jetting the same amount of microcavity regulating materials into the first opening, the second opening and the third opening by a one-time ink jetting process, and leveling to form a first microcavity regulating layer 151 located in the first opening, a second microcavity regulating layer 152 located in the second opening and a third microcavity regulating layer 153 located in the third opening.
Specifically, the S40 further includes:
firstly, respectively jetting the same amount of microcavity regulating materials into the first opening, the second opening and the third opening by a one-time ink jetting process; then, the microcavity adjusting material is leveled to form a first microcavity adjusting layer 151 located in the first opening, a second microcavity adjusting layer 152 located in the second opening, and a third microcavity adjusting layer 153 located in the third opening, as shown in fig. 7D.
The first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 may be independent films other than the red organic light emitting layer, the green organic light emitting layer, the blue organic light emitting layer, the hole injection layer, the hole transport layer, the electron injection layer, and the electron transport layer. Or, the first microcavity adjusting layer 151, the second microcavity adjusting layer 152, and the third microcavity adjusting layer 153 may be selected from any one or more of the red organic light emitting layer, the green organic light emitting layer, the blue organic light emitting layer, the hole injection layer, the hole transport layer, the electron injection layer, and the electron transport layer. Preferably, the materials of the first, second, and third microcavity adjusting layers 151, 152, and 153 include at least one of a hole injection material and a hole transport material.
The volumes of the first, second, and third microcavity conditioning layers 151, 152, and 153 are made equal by ejecting the same amount of microcavity conditioning material; in addition, due to the presence of the first groove 1421 and the second groove 1431, the thickness of the second microcavity adjusting layer 152 is smaller than the thickness of the first microcavity adjusting layer 151, and the thickness of the third microcavity adjusting layer 153 is smaller than the thickness of the second microcavity adjusting layer 152.
S50, a red light emitting material is deposited in the first opening to form a first light emitting device 161, a green light emitting material is deposited in the second opening to form a second light emitting device 162, and a blue light emitting material is deposited in the third opening to form a third light emitting device 163.
Specifically, the S50 further includes:
first, a red light emitting material is deposited in the first opening by an evaporation process to form a first light emitting device 161, a green light emitting material is deposited in the second opening by an evaporation process to form a second light emitting device 162, and a blue light emitting material is deposited in the third opening by an evaporation process to form a third light emitting device 163, as shown in fig. 7E.
Wherein the first light emitting device 161, the second light emitting device 162, and the third light emitting device 163 each include an organic light emitting material.
In the embodiment of the present application, the light emitting areas of the first light emitting unit 131, the second light emitting unit 132, and the third light emitting unit 133 are the same; wherein the light emitting intensity of the second light emitting device 162 is greater than the light emitting intensity of the first light emitting device 161, and the light emitting intensity of the first light emitting device 161 is greater than the light emitting intensity of the third light emitting device 163.
Further, the thickness of the second light emitting device 162 is smaller than that of the first light emitting device 161, and the thickness of the third light emitting device 163 is smaller than that of the first light emitting device 161.
S60, forming a cathode layer 18 on the array structure layer 12.
Specifically, the S60 further includes:
depositing a cathode layer 18 on the array structure layer 12 by using a physical vapor deposition process, the cathode layer 18 completely covering the pixel defining layer 17, the first light emitting device 161, the second light emitting device 162 and the third light emitting device 163; the cathode layer 18 is made of a high-conductivity metal thin film such as Al or Ag, as shown in fig. 7F.
In the manufacturing method of the display panel 10, the same amount of microcavity adjusting material is jetted in each light emitting unit in one inkjet process, the microcavity adjusting material corresponding to the second microcavity adjusting layer 152 is leveled into the first groove 1421 on the second anode 142, and the microcavity adjusting material corresponding to the third microcavity adjusting layer 153 is leveled into the third groove on the third anode 143, so that the lengths of the microcavities of the second light emitting unit 132 and the third light emitting unit 133 are respectively adjusted under the condition that the volumes of the first microcavity adjusting layer 151, the second microcavity adjusting layer 152 and the third microcavity adjusting layer 153 are equal, only one inkjet process is needed, the process is simple, the number of masks is reduced, and the production efficiency can be greatly improved.
Because the thickness of the anode is micrometer unit and the thickness unit of the microcavity regulating layer is angstrom, the grooves with different cross-sectional areas can regulate the thickness of the microcavity regulating layer corresponding to different light-emitting units without influencing the normal light-emitting display of the sub-pixels with different colors.
Further, in order to solve the technical problem of uneven leveling after the micro-cavity regulating material is jetted in one-time inkjet process, in some embodiments, a plurality of first grooves 1421 are disposed on the first anode 141, and a plurality of second grooves 1431 are disposed on the second anode 142; the arrangement can enable the micro-cavity regulating material to be better and uniformly leveled after ink is jetted.
Correspondingly, the embodiment of the present application further provides a mobile terminal, which includes a terminal main body and the display panel 10 as described in any one of the above, where the terminal main body and the display panel 10 are combined into a whole. The mobile terminal has wide application space in vehicle-mounted products, mobile phones, tablets, computers and television products.
The embodiment of the application provides a display panel 10 and a mobile terminal; the display panel 10 includes a plurality of first light emitting units 131 emitting light of a first color and a plurality of second light emitting units 132 emitting light of a second color; the first light emitting unit 131 includes a first anode 141, a first microcavity adjusting layer 151 on the first anode 141, and a first light emitting device 161 on the first microcavity adjusting layer 151, and the second light emitting unit 132 includes a second anode 142, a second microcavity adjusting layer 152 on the second anode 142, and a second light emitting device 162 on the second microcavity adjusting layer 152, wherein a first interval between a light emitting center of the first light emitting device 161 and the first anode 141 is greater than a second interval between a light emitting center of the second light emitting device 162 and the second anode 142, and volumes of the first microcavity adjusting layer 151 and the second microcavity adjusting layer 152 are equal; the volume of the microcavity regulating material arranged in the light-emitting units with different microcavity lengths is the same, so that the microcavity regulating material with the same volume is jetted to each light-emitting unit simultaneously in the ink jet process to form the light-emitting units with different microcavity lengths, the ink jet process is only needed once, the process is simple, the number of light shades is reduced, and the production efficiency of the display panel 10 is improved while the light-emitting efficiency of the light-emitting devices with different colors is improved.
The display panel 10 and the mobile terminal provided by the embodiment of the present invention are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present invention, 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, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A display panel is characterized by comprising a plurality of first light-emitting units for emitting light of a first color and a plurality of second light-emitting units for emitting light of a second color;
the first light-emitting unit comprises a first anode, a first micro-cavity adjusting layer positioned on the first anode and a first light-emitting device positioned on the first micro-cavity adjusting layer, and the second light-emitting unit comprises a second anode, a second micro-cavity adjusting layer positioned on the second anode and a second light-emitting device positioned on the second micro-cavity adjusting layer;
the first distance between the light emitting center of the first light emitting device and the first anode is larger than the second distance between the light emitting center of the second light emitting device and the second anode, and the volumes of the first micro-cavity adjusting layer and the second micro-cavity adjusting layer are equal.
2. The display panel according to claim 1, wherein a thickness of the first anode is larger than a thickness of the second anode.
3. The display panel of claim 1 wherein the second anode has at least one recess disposed thereon, the second microcavity tuning layer covering the recess.
4. The display panel according to claim 3, wherein a depth of the groove is smaller than a thickness of the second anode.
5. The display panel according to claim 3, wherein the display panel further comprises a plurality of third light emitting units emitting light of a third color, and a light emitting area of the third light emitting units is larger than a light emitting area of the first light emitting units or the second light emitting units.
6. The display panel according to claim 3, wherein a light emitting area of the second light emitting unit is larger than a light emitting area of the first light emitting unit.
7. The display panel according to claim 1, wherein the second light-emitting unit has a light emission intensity larger than that of the first light-emitting unit, and wherein the second light-emitting unit has a thickness smaller than that of the first light-emitting unit.
8. The display panel of claim 1, wherein the first anode and the second anode each comprise a first ITO layer, a silver metal layer disposed on the first ITO layer, and a second ITO layer disposed on the silver metal layer;
wherein a distance between the light emitting center of the first light emitting device and the silver metal layer is larger than a distance between the light emitting center of the second light emitting device and the silver metal layer.
9. The display panel according to claim 8, wherein a material of the first microcavity adjusting layer and the second microcavity adjusting layer includes at least one of an organic light-emitting material, a hole-injecting material, a hole-transporting material, an electron-injecting material, and an electron-transporting material.
10. A mobile terminal characterized by comprising a terminal body and the display panel according to any one of claims 1 to 9, the terminal body being integrated with the display panel.
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