CN113053968A - Organic light emitting display panel and display device - Google Patents
Organic light emitting display panel and display device Download PDFInfo
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- CN113053968A CN113053968A CN202110259202.8A CN202110259202A CN113053968A CN 113053968 A CN113053968 A CN 113053968A CN 202110259202 A CN202110259202 A CN 202110259202A CN 113053968 A CN113053968 A CN 113053968A
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- 230000002829 reductive effect Effects 0.000 claims abstract description 8
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- 238000007641 inkjet printing Methods 0.000 description 6
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- 230000008020 evaporation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 238000002207 thermal evaporation Methods 0.000 description 2
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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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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Abstract
The embodiment of the application provides an organic light-emitting display panel and a display device, relates to the technical field of display, and can reduce the probability of ink drops dropping on the top of a dam, improve the integral uniformity of a film layer and further improve the light-emitting uniformity of the panel. The organic light emitting display panel includes: a substrate; a pixel defining layer on one side of the substrate, the pixel defining layer including an opening and a bank surrounding the opening; the dam has a cross-section; in the cross section, the width of the dam is gradually reduced in the direction gradually away from the substrate; on the cross section, dykes and dams include two relative sides, and the side includes many inclined edges, and in the direction of keeping away from the base plate gradually, the head and the tail of many inclined edges connect gradually and form the side, and the angle of inclination and the high negative correlation of inclined edge on inclined edge.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to an organic light emitting display panel and a display device.
Background
At present, in a manufacturing process of an Organic Light-Emitting display (OLED) panel, including a process of manufacturing an Organic functional layer through an inkjet printing process, in the printing process, ink needs to be printed into an opening formed by a pixel defining layer, however, in the inkjet printing process, the height of a printing head and a printing angle may deviate with a certain probability, or due to movement of a substrate in the printing process, deviation of drop dot precision of ink drops may occur, the ink drops may fall outside the opening of the pixel defining layer, which may cause overall uniformity of the Organic functional layer to be reduced, and further, Light-Emitting uniformity of the panel is reduced.
Disclosure of Invention
The embodiment of the application provides an organic light emitting display panel and display device, can reduce the probability that the ink droplet drips at dykes and dams top, improves the whole homogeneity of rete to improve the luminous homogeneity of panel.
In a first aspect, an embodiment of the present application provides an organic light emitting display panel, including:
a substrate;
a pixel defining layer on one side of the substrate, the pixel defining layer including an opening and a bank surrounding the opening;
the dam is provided with a cross section which is perpendicular to the plane of the substrate;
on the cross section, in the direction gradually far away from the substrate, the width of the dam is gradually reduced, and the width of the dam is the size of the dam in the direction parallel to the plane of the substrate;
on the cross section, the dykes and dams include two relative sides, the side includes many sloping edges, in keeping away from gradually in the direction of base plate, the head and the tail of many sloping edges connect gradually and form the side, the angle of inclination of sloping edge with the height negative correlation of sloping edge, the angle of inclination of sloping edge be the sloping edge with the contained angle between the plane of base plate place, the height of sloping edge be the sloping edge with the distance between the base plate.
In a possible implementation manner, in the direction gradually away from the substrate, the side edges include the 1 st to nth inclined edges connected end to end, where N > 1, the inclination angle of the ith inclined edge is greater than that of the (i + 1) th inclined edge, and the value of i is 1, 2, …, N.
In a possible embodiment, the difference between the inclination angle of the jth inclined edge and the inclination angle of the (j + 1) th inclined edge is equal to the difference between the inclination angle of the (j-1) th inclined edge and the inclination angle of the jth inclined edge, and j is 2, 3, …, N.
In a possible embodiment, the difference between the inclination angle of the jth inclined edge and the inclination angle of the (j + 1) th inclined edge is larger than the difference between the inclination angle of the (j-1) th inclined edge and the inclination angle of the jth inclined edge, and j takes a value of 2, 3, …, N.
In a possible embodiment, each of the oblique edges corresponds to an equal height distance, the height distance corresponding to the oblique edge is a perpendicular distance between a head end of the oblique edge and a tail end plane of the oblique edge, and the tail end plane of the oblique edge passes through the tail end of the oblique edge and is parallel to a plane of the substrate.
In a possible embodiment, the height distance corresponding to the inclined edge gradually increases in a direction gradually away from the substrate, the height distance corresponding to the inclined edge is a perpendicular distance between a head end of the inclined edge and a tail end plane of the inclined edge, and the tail end plane of the inclined edge passes through the tail end of the inclined edge and is parallel to a plane of the substrate.
In a possible embodiment, in the cross-section, an end of the dam facing away from the substrate is an angle formed by two opposite sides.
In a possible embodiment, the two opposite sides are symmetrical in the cross-section.
In a possible embodiment, the surface of the dykes has hydrophobic molecules.
In one possible embodiment, the substrate includes a pixel driving circuit;
the organic light emitting display panel further includes a light emitting device including an organic functional layer in the opening.
In one possible embodiment, the light emitting device includes a red light emitting device, a green light emitting device, and a blue light emitting device;
the bank includes a red sub-pixel side adjacent to the red light emitting device, a green sub-pixel side adjacent to the green light emitting device, and a blue sub-pixel side adjacent to the blue light emitting device;
the inclination angle of the inclined edge of the side edge of the blue sub-pixel, which is farthest away from the substrate, is larger than that of the inclined edge of the side edge of the red sub-pixel, which is farthest away from the substrate;
the inclination angle of the inclined edge of the side edge of the blue sub-pixel farthest away from the substrate is larger than that of the inclined edge of the side edge of the green sub-pixel farthest away from the substrate.
In a second aspect, embodiments of the present application further provide a display device, including the organic light emitting display panel.
The organic light emitting display panel and the display device in the embodiment of the application, the inclination angle of the dykes and dams inclined edge that sets up the pixel definition layer reduces along with the altitude increase gradually, on the one hand, is favorable to falling the ink droplet landing on the inclined edge, and on the other hand, the angle change of inclination angle is favorable to reducing the surface area of dykes and dams top surface under lower height to reduce the probability that the ink droplet landing is at dykes and dams top, improve the whole homogeneity of rete, thereby improve the luminous homogeneity of panel.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a plan view of a partial region of an organic light-emitting display panel according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view along AA' of FIG. 1;
FIG. 3 is an enlarged partial view of a portion of the area of FIG. 2;
FIG. 4 is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
FIG. 5a is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
FIG. 5b is a schematic diagram of a wind showering process of an organic light emitting display panel in a comparative example;
FIG. 6 is a schematic view of a thermal evaporation process according to an embodiment of the present application;
FIG. 7 is another enlarged partial view of a portion of the area of FIG. 2;
FIG. 8 is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application,
the terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
An embodiment of the present application provides an organic light emitting display panel, including: a substrate 1; a pixel defining layer 2 on one side of the substrate 1, the pixel defining layer 2 including an opening 21 and a bank 22 surrounding the opening 21; the dam 22 has a cross section, the cross section is perpendicular to the plane of the substrate 1, the plane of the substrate 1 is the plane defined by the x-axis and the y-axis, the cross section is the plane defined by the x-axis and the z-axis, and any two of the x-axis, the y-axis and the z-axis are perpendicular; in cross section, in the direction gradually away from the substrate 1, i.e. in the z-axis direction, the width h of the dam 22 gradually decreases, the width h of the dam 22 is the dimension of the dam 22 in the direction parallel to the plane of the substrate 1, i.e. the width h of the dam 22 is the dimension in the x-axis direction, i.e. the width h and the height of the dam 22 are inversely related, i.e. the height is the distance between the substrates 1; as shown in fig. 3, in cross section, the dam 22 includes two opposite side edges L, the side edges L include a plurality of inclined edges S, the end of each inclined edge S is connected in sequence to form the side edge L in the direction gradually away from the substrate 1, the inclination angle θ of the inclined edge S is inversely related to the height D of the inclined edge S, the inclination angle θ of the inclined edge S is the included angle between the inclined edge S and the plane of the substrate 1, and the height D of the inclined edge S is the distance between the inclined edge S and the substrate 1. In the embodiment of the present application, the inclination angle θ is an acute angle between the inclined side S and the plane of the substrate 1, that is, the inclination angle θ is an acute angle between the inclined side S and the x-axis.
Specifically, for example, assuming that the side L on the left side in fig. 3 includes four inclined sides S1, S2, S3 and S4 in this order from bottom to top, wherein the inclination angle θ 1 of the inclined side S1, the inclination angle θ 2 of the inclined side S2, the inclination angle θ 3 of the inclined side S3 and the inclination angle θ 4 of the inclined side S4 decrease in this order, the height D1 of the inclined side S1, the height D2 of the inclined side S2, the height D3 of the inclined side S3 and the height D4 of the inclined side S4 decrease and increase in this order, for example, D1 is equal to 0, for the inclination angle θ of the inclined side S, the larger the angle is, the ink droplets falling on the inclined side S slide more easily, the smaller the inclination angle θ is the smaller the height of the side L is more favorable for decreasing the surface area of the top surface of the bank 22 at a lower height, and if the surface area of the top surface is larger, the ink droplets are likely to fall on the top of the bank, resulting in a decrease in the overall uniformity of the organic functional layer and thus a decrease in the uniformity of light emission of the panel, whereas in the present embodiment, since the surface area of the top surface is small, the problem that ink droplets are not likely to fall into the openings 21 because they fall on the tops of the banks 22 is improved. In the present embodiment, the top of the bank 22 refers to the end of the bank 22 on the side away from the substrate 1. In addition, the ink in the embodiment of the present application refers to an ink droplet printed when a film layer in the opening 21 of the pixel defining layer 2 is manufactured through an inkjet printing process during a manufacturing process of the organic light emitting display panel. It should be noted that the organic light emitting display panel shown in fig. 2 and 3 only illustrates the structures of the substrate 1 and the pixel defining layer 2, and other structures are omitted, for example, fig. 4 also illustrates an anode 31, a cathode 32 and an organic functional layer 33, wherein each opening 21 of the pixel defining layer 2 may correspond to one light emitting device 30, each light emitting device 30 includes a corresponding anode 31, a corresponding cathode 32 and an organic functional layer 33, wherein each opening 21 corresponds to one independent anode 31, the whole display panel cathode 32 may be a continuous whole-surface structure, that is, one cathode 32 is shared by all the light emitting devices 30, the organic functional layer 33 is located in the corresponding opening 21, wherein at least a part of the organic functional layer 33 is a film layer for manufacturing by an inkjet printing process, and the organic functional layer 33 may include, for example, a hole transport layer, a hole injection layer, An electron transport layer, an electron injection layer, and an organic light emitting layer.
The organic light emitting display panel in the embodiment of the application, the inclination angle of the dykes and dams inclined edge that sets up pixel definition layer reduces along with the altitude increase gradually, on the one hand, is favorable to falling the ink droplet landing on the inclined edge, and on the other hand, the angle change at inclination angle is favorable to reducing the surface area of dykes and dams top surface under lower height to reduce the probability that the ink droplet landing is at the dykes and dams top, improve the whole homogeneity of rete, thereby improve the luminous homogeneity of panel.
In a possible embodiment, as shown in fig. 3, in a direction gradually away from the substrate 1, the side L includes the 1 st to nth inclined sides S connected end to end, where N > 1, an inclination angle θ of the ith inclined side S is greater than an inclination angle θ of the (i + 1) th inclined side S, and i is 1, 2, …, N. That is, for any two adjacent oblique sides S, the oblique angle of the lower side (the side close to the substrate 1) is larger than that of the upper side, for example, the side L includes the 1 st oblique side S1, the 2 nd oblique side S2, the 3 rd oblique side S3 and the 4 th oblique side S4 which are connected end to end in sequence, and the four oblique sides S are divided into the corresponding oblique angles θ 1, θ 2, θ 3 and θ 4, wherein θ 1 > θ 2 > θ 3 > θ 4, and in this structure, the oblique degree of the side L can be changed more uniformly, and the change is more favorable for the ink drop on the side L.
In one possible embodiment, as shown in fig. 3, the difference between the tilt angle θ of the jth inclined side S and the tilt angle θ of the (j + 1) th inclined side S is equal to the difference between the tilt angle θ of the (j-1) th inclined side S and the tilt angle θ of the jth inclined side S, and j is 2, 3, …, N. That is, the inclined angles θ of the inclined sides S are arranged in an equal difference in a direction (z-axis direction) gradually away from the substrate 1, for example, the side L includes a 1 st inclined side S1, a 2 nd inclined side S2, a 3 rd inclined side S3, and a 4 th inclined side S4 connected end to end, and the four inclined sides S are divided into corresponding inclined angles θ 1, θ 2, θ 3, and θ 4, where θ 3 — θ 4 is θ 2 — θ 3 is θ 1 — θ 2, and the process is simpler.
In one possible embodiment, as shown in fig. 3, the difference between the inclination angle θ of the jth inclined side S and the inclination angle θ of the (j + 1) th inclined side S is larger than the difference between the inclination angle θ of the (j-1) th inclined side S and the inclination angle θ of the jth inclined side S, and j is 2, 3, …, N. That is, the difference in the inclination angle θ between the adjacent inclined sides S gradually increases in the direction (z-axis direction) away from the substrate 1, for example, the side edge L includes a 1 st inclined edge S1, a 2 nd inclined edge S2, a 3 rd inclined edge S3 and a 4 th inclined edge S4 which are connected end to end, the four inclined edges S are divided into corresponding inclined angles theta 1, theta 2, theta 3 and theta 4, wherein theta 3-theta 4 > theta 2-theta 3 > theta 1-theta 2, so that the surface area of the top end of the bank 22 can be minimized, the farther away from the substrate 1, when the difference in the inclination angle theta of the adjacent inclined sides S becomes large, the surface area of the top end of the bank 22 is reduced more, because, assuming that the height of each inclined side S in the z-axis direction is the same, as the inclination angle θ of the inclined side S is smaller, the length of the inclined side S is larger, i.e., the surface area of the top end of the bank 22 can be more reduced.
In one possible embodiment, as shown in fig. 2, the height distance H corresponding to each oblique side S is equal, the height distance H corresponding to the oblique side S is the perpendicular distance between the head end of the oblique side S and the end plane of the oblique side S passing through the end of the oblique side S and being parallel to the substrate 1 in plane. The end plane is a plane defined by the x-axis and the y-axis, and the height distance H can also be understood as the dimension of the inclined sides S in the z-axis direction.
In one possible embodiment, as shown in fig. 2, the height distance H corresponding to the inclined edge S gradually increases in a direction gradually away from the substrate 1, the height distance H corresponding to the inclined edge S is a perpendicular distance between a head end of the inclined edge S and a tail end plane of the inclined edge S, and the tail end plane of the inclined edge S passes through a tail end of the inclined edge S and is parallel to a plane of the substrate 1. The inclination angle θ of the inclined side S gradually increases in the direction (z-axis direction) gradually away from the substrate 1, and on this basis, for the inclined side S having a larger inclination θ, if the corresponding height distance H is larger, the length of the inclined side S can be increased more, that is, the surface area of the top end of the bank 22 can be reduced more.
In one possible embodiment, as shown in fig. 5a, in cross-section, the end of the dam 22 remote from the substrate 1 is the angle formed by two opposite sides L. That is, even if the bank 22 is provided in a peaked configuration rather than having a flat top end of the bank 22 as the process and size permit, the ink droplets on the top end of the bank 22 can be slid into the opening 21 with maximum definition.
As shown in fig. 5a, for the dam 22 having the pointed top structure, it will not form a plane on the top of the dam 22, and the dam itself will not emit light, so if the top of the dam forms a plane, it is easier to make the external light perpendicular to the panel direction form a mirror reflection due to the plane on the top of the dam, thereby causing a bad influence on the display, whereas in the embodiment of the present application, since the dam 22 forms the pointed top structure, it is not easy to form the mirror reflection, thereby improving the bad influence on the display due to the mirror reflection.
In addition, as shown in fig. 5a, for the dam 22, the side surface thereof can reflect the light from the inside of the opening 21, if the dam has a plane surface of the top, a portion of the plane surface of the top cannot play a role of reflecting the light inside the opening, therefore, the dam 22 is provided with a pointed structure in the embodiment of the present application, that is, the structure in more regions can reflect the light inside the opening 21, the plane surface of the top without the function of reflecting the light inside the opening 21 is removed, and the light emitting area can be increased.
In addition, as a comparative example in which the structure of the bank 01 forms a top plane and a step plane, as shown in fig. 5b, minute ink droplets 03 are easily left on the bank 01 after printing ink, and thus, it is necessary to perform a wind shower process in which gas is ejected from the head 02 to blow the ink droplets 03 into the openings. In the embodiment of the present invention, for example, in the structure shown in fig. 5, since the banks 22 form the inclined sides connected end to end at the side edges, no step surface is formed, and since the banks 22 have the sharp top, no plane surface is formed at the top, the printed ink can more easily fall into the opening 21 without the air shower process through the head.
In one possible embodiment, as shown in fig. 2 to 5a, in the cross section, two opposite sides L are symmetrical, and since the opening 21 is formed by surrounding the dam 22, the opening 21 is formed on both sides of the dam 22, and the symmetrical sides L are provided, so that the film layer corresponding to each light emitting device can be more uniform, and the display uniformity can be improved.
In one possible embodiment, the surface of the dykes 22 has hydrophobic molecules, as shown in fig. 1-5 a.
Specifically, for example, as shown in fig. 6, a panel manufactured with a substrate 1 and a dam 22 is placed in a closed cavity 3, a small molecule evaporation source 4 is further disposed in the cavity, a mask 5 is disposed above an opening 21, the side edge of the dam 22 is exposed outside the mask 5, a hydrophobic small molecule, such as a small molecule containing a fluorinated alkyl chain, is evaporated to the surface of the dam 22 by a thermal evaporation method of the small molecule evaporation source 4, such that the hydrophobic degree of the surface of the dam 22 is consistent, and the small molecule reacts with the surface of the dam 22 by a bonding manner (the small molecule terminal group is bonded with the surface of the dam 22), the dam 22 can have a hydrophobic surface with high reliability, and meanwhile, due to the disposition of the mask 5, the small molecule can be prevented from falling into the opening 21, so as to prevent adverse effects on the organic functional layer in the opening 21 during the subsequent process, after the dykes 22 form the hydrophobic surface, when the organic functional layer in the opening 21 is manufactured through the ink jet printing process, when ink drops drop on the surface of the dykes 22, the hydrophobic surface design of the dykes 22 is matched with the side edge design of the gradient inclination angle, so that the ink drops more easily slide into the opening 21, the uniformity of the organic functional layer is improved, and the light emitting uniformity of the panel is improved. The above process for manufacturing the hydrophobic surface is only an example, and the specific process for manufacturing the hydrophobic molecules on the surface of the bank 22 is not limited in the embodiments of the present application.
In addition, in addition to the embodiment in which the hydrophobic molecules are provided on the entire surface of the bank 22, the bank 22 may be provided to have the hydrophobic molecules on the surface away from the substrate 1, and the hydrophilic molecules on the surface of the bank 22 close to the substrate 1, or hydrophobic molecules are provided only on the surface of the bank 22 away from the substrate 1, while the hydrophobic and hydrophilic properties are not changed on the surface of the bank 22 close to the substrate 1, even if the upper side surface of the bank 22 has a higher hydrophobicity than the lower side surface of the bank 22, since the lower side surface of the bank 22 is used to directly surround the sidewall forming the opening 21 as a subsequent organic functional layer, therefore, on one hand, the upper surface of the dam 22 has high hydrophobicity so that ink drops can slide into the opening 21, and on the other hand, the lower surface of the dam 22 has low hydrophobicity so as to improve the uneven film thickness caused by solvent volatilization in the ink-jet printing process.
In the embodiment of the present invention, the manufacturing process of the bank 22 is not limited as long as the structure satisfying the above-mentioned inclination angle θ can be formed, and for example, in the structure shown in fig. 2 and 3, each inclined side S corresponds to one layer structure, that is, a plurality of portions of the bank 22 can be manufactured layer by layer, for example, a whole layer structure corresponding to the inclined side S1 is manufactured first, the layer structure has the inclined side S1 and the inclination angle θ 1, after the layer structure is manufactured, a whole layer structure corresponding to the inclined side S2 is manufactured, the cap layer structure has the inclined side S2 and the inclination angle θ 2, and the four layers are stacked to form the whole bank 22 after the four layers are manufactured. In addition to this, the whole dam 22 can be directly manufactured by the same process without delamination under the conditions allowed by the process, for example, in the structure shown in fig. 4, the dam 22 does not need to be physically delaminated, and only the side L of the dam 22 needs to form the corresponding inclination angle θ.
In addition, in the figures corresponding to the above embodiments, only each inclined side S is taken as a straight line as an example, however, the present embodiment is not limited to the case that the edge of the dam 22 in the cross section is only composed of line segments, for example, as shown in fig. 7, when the value of N in the 1 st to nth inclined sides is large, the side L may be considered as an arc line, that is, the side surface of the dam 22 is an arc surface structure, and for the side L of the arc line, the acute included angle between the tangent line at each position on the side and the plane where the substrate 1 is located may be considered as the inclined angle θ of the inclined side, and it can be seen that the farther the distance from the substrate 1 is, the smaller the inclined angle θ of the inclined side is, that is, the inclined angle of the inclined side is negatively correlated with the height of the.
In one possible embodiment, as shown in fig. 4, the substrate 1 includes a pixel driving circuit (not shown in the figure); the organic light emitting display panel further includes a light emitting device 30, and the light emitting device 30 includes an organic functional layer 33 in the opening 21.
In one possible embodiment, as shown in fig. 8, the light emitting device 30 includes a red light emitting device R, a green light emitting device G, and a blue light emitting device B; the opening 21 includes a red sub-pixel opening corresponding to the red light emitting device, a green sub-pixel opening corresponding to the green light emitting device, and a blue sub-pixel opening corresponding to the blue light emitting device, the red light emitting device R is disposed in the red sub-pixel opening, the green light emitting device G is disposed in the green sub-pixel opening, and the blue light emitting device B is disposed in the blue sub-pixel opening; the bank 22 includes a red subpixel side LR adjacent to the red light emitting device R, a green subpixel side LG adjacent to the green light emitting device G, and a blue subpixel side LB adjacent to the blue light emitting device B; the inclination angle thetaB of the inclined edge of the side LB of the blue sub-pixel farthest away from the substrate 1 is larger than the inclination angle thetaR of the inclined edge of the side LR of the red sub-pixel farthest away from the substrate 1; the inclination angle thetab of the inclined side of the blue sub-pixel side LB farthest from the substrate 1 is larger than the inclination angle thetag of the inclined side of the green sub-pixel side LG farthest from the substrate 1. Because the service life of the organic light emitting layer material in the blue sub-light emitting device B is shorter than that of the organic light emitting layer materials of other colors, in order to improve the light emitting brightness uniformity of the sub-pixels of different colors, in the embodiment of the present application, θ B > θ G, and θ B > θ R are set, so that the area of the organic light emitting layer arranged in the opening of the blue sub-pixel is larger, that is, the area of the opening of the blue sub-pixel is larger, that is, the current density in the blue light emitting device B is smaller, that is, in the long-time working process, the light emitting brightness uniformity of the blue light emitting device B and the light emitting devices of other colors can be improved.
As shown in fig. 9, an embodiment of the present application further provides a display device including the organic light emitting display panel 200 described above. The specific structure of the display panel 200 is the same as the above embodiments, and is not described herein again.
The specific structure and principle of the display panel 200 are the same as those of the above embodiments, and are not described herein again. The display device may be any electronic device with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, or a television.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (12)
1. An organic light emitting display panel, comprising:
a substrate;
a pixel defining layer on one side of the substrate, the pixel defining layer including an opening and a bank surrounding the opening;
the dam is provided with a cross section which is perpendicular to the plane of the substrate;
on the cross section, in the direction gradually far away from the substrate, the width of the dam is gradually reduced, and the width of the dam is the size of the dam in the direction parallel to the plane of the substrate;
on the cross section, the dykes and dams include two relative sides, the side includes many sloping edges, in keeping away from gradually in the direction of base plate, the head and the tail of many sloping edges connect gradually and form the side, the angle of inclination of sloping edge with the height negative correlation of sloping edge, the angle of inclination of sloping edge be the sloping edge with the contained angle between the plane of base plate place, the height of sloping edge be the sloping edge with the distance between the base plate.
2. The organic light-emitting display panel according to claim 1,
in the direction of keeping away from gradually the base plate, the side includes the 1 st to nth slope limit that the end to end connects gradually, and N > 1, and wherein, the angle of inclination of the ith slope limit is greater than the angle of inclination of the (i + 1) th slope limit, and the value of i is 1, 2, …, N.
3. The organic light-emitting display panel according to claim 2,
the difference between the inclination angle of the jth inclined edge and the inclination angle of the jth +1 inclined edge is equal to the difference between the inclination angle of the jth-1 inclined edge and the inclination angle of the jth inclined edge, and j takes the values of 2, 3, … and N.
4. The organic light-emitting display panel according to claim 2,
the difference between the inclination angle of the jth inclined edge and the inclination angle of the jth +1 inclined edge is larger than the difference between the inclination angle of the jth-1 inclined edge and the inclination angle of the jth inclined edge, and the value of j is 2, 3, … and N.
5. The organic light-emitting display panel according to claim 1,
the height distance corresponding to each inclined edge is equal, the height distance corresponding to each inclined edge is the vertical distance between the head end of each inclined edge and the tail end plane of each inclined edge, and the tail end plane of each inclined edge passes through the tail end of each inclined edge and is parallel to the plane of the substrate.
6. The organic light-emitting display panel according to claim 1,
in the direction of gradually keeping away from the base plate, the height distance that corresponds to the bevel edge gradually increases, the height distance that corresponds to the bevel edge is the perpendicular distance between the head end of the bevel edge and the terminal plane of the bevel edge, the terminal plane of the bevel edge passes through the terminal of the bevel edge and is parallel to the plane of the base plate.
7. The organic light-emitting display panel according to claim 1,
in the cross section, one end of the dam, which is far away from the substrate, is an included angle formed by two opposite side edges.
8. The organic light-emitting display panel according to claim 1,
in the cross section, the two opposite sides are symmetrical.
9. The organic light-emitting display panel according to claim 1,
the surface of the dam has hydrophobic molecules.
10. The organic light-emitting display panel according to claim 1,
the substrate includes a pixel driving circuit;
the organic light emitting display panel further includes a light emitting device including an organic functional layer in the opening.
11. The organic light-emitting display panel according to claim 10,
the light emitting device includes a red light emitting device, a green light emitting device, and a blue light emitting device;
the bank includes a red sub-pixel side adjacent to the red light emitting device, a green sub-pixel side adjacent to the green light emitting device, and a blue sub-pixel side adjacent to the blue light emitting device;
the inclination angle of the inclined edge of the side edge of the blue sub-pixel, which is farthest away from the substrate, is larger than that of the inclined edge of the side edge of the red sub-pixel, which is farthest away from the substrate;
the inclination angle of the inclined edge of the side edge of the blue sub-pixel farthest away from the substrate is larger than that of the inclined edge of the side edge of the green sub-pixel farthest away from the substrate.
12. A display device characterized by comprising the organic light-emitting display panel according to any one of claims 1 to 11.
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