CN110783483A - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN110783483A CN110783483A CN201910818976.2A CN201910818976A CN110783483A CN 110783483 A CN110783483 A CN 110783483A CN 201910818976 A CN201910818976 A CN 201910818976A CN 110783483 A CN110783483 A CN 110783483A
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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
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- H—ELECTRICITY
- 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
- H10K59/10—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
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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
- H10K59/17—Passive-matrix OLED displays
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- H—ELECTRICITY
- 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
- H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
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- H—ELECTRICITY
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Abstract
The embodiment of the invention discloses a display panel, a manufacturing method thereof and a display device, wherein the display panel at least comprises a first display area, the first display area is provided with a first sub-pixel, and the first display area comprises: a first substrate; the display device comprises a first substrate, a first electrode and a first pixel defining layer, wherein the first electrode is positioned on one side of the first substrate, the first pixel defining layer is positioned on one side of the first electrode, which is far away from the first substrate, the first pixel defining layer comprises a first pixel opening, and a first light emitting layer is arranged in the first pixel opening; the second electrode is positioned on one side of the first light-emitting layer away from the first substrate; the first display area further comprises an isolation column, and the isolation column is arranged on one side, far away from the first substrate, of the first pixel limiting layer; the size of the orthogonal projection of the surface of one side, far away from the first substrate, of the isolation column on the first substrate is larger than that of the orthogonal projection of the surface of one side, near the first substrate, of the isolation column on the first substrate, and the surface of one side, far away from the substrate, of the isolation column is provided with a concave structure, so that the optical path difference of light passing through the isolation column can be reduced, and the diffraction phenomenon is further weakened.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a manufacturing method thereof and a display device.
Background
With the rapid development of display terminals, the requirements of users on screen occupation ratio are higher and higher, so that the comprehensive screen display of the display terminal is concerned more and more in the industry. The comprehensive screen among the prior art is mostly the mode of fluting or trompil, like bang screen etc. all is the regional fluting or trompil of display screen that corresponds at components such as camera, sensor. When the function of shooing is realized, the external light penetrates into the camera below the display screen through the groove or the hole on the display screen, so that the shooting is realized. However, neither the bang screen nor the perforated screen is a real full screen, and therefore, the development of a real full screen is urgently needed in the industry.
Disclosure of Invention
In view of the above, it is necessary to provide a full-screen display panel, a method for manufacturing the same, and a display device.
In a first aspect, an embodiment of the present invention provides a display panel, where the display panel at least includes a first display area, the first display area has a first sub-pixel, and the first display area includes:
the first substrate is a light-transmitting substrate; the display device comprises a first substrate, a first electrode and a first pixel defining layer, wherein the first electrode is positioned on one side of the first substrate, the first pixel defining layer is positioned on one side of the first electrode, which is far away from the first substrate, the first pixel defining layer comprises a first pixel opening, and a first light emitting layer is arranged in the first pixel opening; a plurality of second electrodes positioned on one side of the first light-emitting layer away from the first substrate; the first sub-pixel comprises a first electrode, a first light-emitting layer and a second electrode;
the first display area further comprises an isolation column, the isolation column is arranged on one side, away from the first substrate, of the first pixel limiting layer, and the isolation column is used for isolating the adjacent second electrodes; the size of the orthogonal projection of the surface of one side, far away from the first substrate, of the isolation column on the first substrate is larger than the size of the orthogonal projection of the surface of one side, near the first substrate, of the isolation column on the first substrate, and the surface of one side, far away from the substrate, of the isolation column is provided with a concave structure.
Optionally, the isolation column is in an inverted trapezoid shape, and the recessed structure is in a regular trapezoid shape, an inverted trapezoid shape or a rectangular shape.
Optionally, the recessed structure is in an inverted trapezoid shape, the isolation column includes a first sidewall, a second sidewall, and a bottom connecting the first sidewall and the second sidewall, the sidewalls of the isolation column have a thickness consistent with the bottom.
Optionally, the first sub-pixel emits light in a passive driving manner; each first electrode extends along a first direction, each second electrode extends along a second direction, and the first direction and the second direction are intersected; the isolation column extends along the second direction, and is arranged between the adjacent second electrodes.
Optionally, along the first direction, distances between different isolation pillars and the edge of the first pixel opening adjacent to the same side are different.
Optionally, the display panel further includes a packaging layer, the packaging layer is disposed on one side of the second electrode and the partition layer away from the first substrate, and the packaging layer fills the recessed structure;
preferably, the encapsulation layer includes at least one organic layer and at least one inorganic layer stacked, the organic layer filling the recess structure.
Optionally, the display panel further includes a second display area, the second display area has a second sub-pixel, and the second display area includes:
the second substrate, a third electrode positioned on one side of the second substrate and a second pixel defining layer positioned on one side of the third electrode far away from the second substrate, wherein the second pixel defining layer comprises a second pixel opening, a second light emitting layer is arranged in the second pixel opening, and a fourth electrode is arranged on one side of the second light emitting layer far away from the second substrate; the second sub-pixel comprises a third electrode, a fourth electrode and a second light-emitting layer between the third electrode and the fourth electrode;
preferably, the second sub-pixel emits light in an active driving mode, and the third electrode is of a block structure;
preferably, the third electrode is a block structure, and the fourth electrode is a face electrode;
preferably, the second display area completely or partially surrounds the first display area;
preferably, part of the film layers of the first display area and the second display area are located in the same layer, wherein the part of the film layers of the first display area and the second display area are located in the same layer, and at least one of the following conditions is satisfied: the first electrode and the third electrode are positioned on the same layer, the first pixel limiting layer and the second pixel limiting layer are positioned on the same layer, the first light-emitting layer and the second light-emitting layer are positioned on the same layer, and the second electrode and the fourth electrode are positioned on the same layer;
preferably, the light transmittance of the transparent display region is greater than 70%;
preferably, the first electrode is a transparent electrode, and the material of the transparent electrode comprises at least one of indium tin oxide, indium zinc oxide, silver-doped indium tin oxide and silver-doped indium zinc oxide;
preferably, the display panel further includes a polarizer at least in the second display region, and the polarizer is located on a side of the second electrode away from the second substrate.
In a second aspect, an embodiment of the present invention further provides a display device, including:
an apparatus body having a device region;
the display panel provided by the first aspect covers the device body;
the device area is located below the first display area of the display panel, and a photosensitive device which transmits or collects light rays through the first display area is arranged in the device area.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, including:
providing a first substrate, wherein the first substrate is a light-transmitting substrate;
forming a first electrode on one side of a first substrate;
forming a first pixel defining layer on one side of the first electrode, the first pixel defining layer including a first pixel opening;
forming a first light emitting layer in the first pixel opening; forming a preformed isolated column on one side of the first pixel definition layer far away from the first substrate, wherein the size of the orthogonal projection of the surface of one side of the preformed isolated column far away from the first substrate on the first substrate is larger than that of the orthogonal projection of the surface of one side of the preformed isolated column close to the first substrate on the first substrate;
patterning the surface of one side, far away from the first substrate, of the preformed isolation column to form the isolation column of which the surface, far away from one side of the first substrate, of the preformed isolation column comprises a concave structure;
and evaporating a conductive material layer, wherein the conductive material layer is separated by the isolation column to form a second electrode.
Optionally, forming a preformed isolation pillar on a side of the first pixel defining layer away from the first substrate includes:
forming a sacrificial layer on one side of the first pixel defining layer far away from the first substrate;
patterning the sacrificial layer to form a first groove on the sacrificial layer;
filling a partition layer material in the first groove to form a preformed isolation column;
preferably, after patterning a surface of the preformed pillar on a side away from the first substrate to form a pillar having a recessed structure on a surface of the preformed pillar on a side away from the first substrate, the method further includes:
removing the sacrificial layer by wet etching;
preferably, the material of the sacrificial layer is Indium Tin Oxide (ITO) or Indium Gallium Zinc Oxide (IGZO), and the etching solution of the wet etching includes oxalic acid;
preferably, the material of the sacrificial layer is molybdenum or titanium, and the etching solution for wet etching includes a mixed solution of nitric acid, acetic acid and phosphoric acid.
The embodiment of the invention provides a display panel, a manufacturing method thereof and a display device.A first display area comprises an isolation column, the isolation column is arranged on one side of a first pixel limiting layer, which is far away from a first substrate, and the isolation column is used for isolating an adjacent second electrode; the size of the orthogonal projection of the surface of the side, far away from the first substrate, of the isolation column on the first substrate is larger than the size of the orthogonal projection of the surface of the side, far away from the first substrate, of the isolation column on the first substrate, and the surface of the side, far away from the substrate, of the isolation column is provided with a concave structure, so that the isolation column can cut off the second electrode, on the basis of avoiding short circuit, the optical path difference of light passing through the isolation column is reduced, further the diffraction phenomenon is weakened, and when the photosensitive device is arranged below the display panel provided by the embodiment of the invention, the image definition can be higher, and the problem of fuzzy photographing is avoided.
Drawings
Fig. 1 is a top view of a display panel according to an embodiment of the present invention;
FIG. 2 is a sectional view taken along section line A-A' of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a comparison of light passing through two types of spacers according to an embodiment of the present invention;
FIG. 5 is a second comparison of light passing through two types of spacers according to an embodiment of the present invention;
fig. 6 is a cross-sectional view of another display panel provided in an embodiment of the present invention;
fig. 7 is a cross-sectional view of another display panel provided in an embodiment of the present invention;
FIG. 8 is a schematic diagram of a structure of an isolation pillar in a display panel according to an embodiment of the present invention;
FIG. 9 is a top view of another display panel provided in accordance with an embodiment of the present invention;
fig. 10 is a cross-sectional view of another display panel provided in an embodiment of the present invention;
fig. 11 is a cross-sectional view of another display panel provided in an embodiment of the present invention;
FIG. 12 is a top view of another display panel provided in accordance with an embodiment of the present invention;
fig. 13 is a cross-sectional view of another display panel provided in an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 15 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention;
fig. 16 is an intermediate structure diagram of a display panel according to an embodiment of the present invention;
fig. 17 is another intermediate structure diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, in the prior art, neither the bang screen nor the perforated screen can achieve a true full screen. The inventor has found that, in order to realize a full-screen, it is necessary to directly cover the display panel on the photosensitive device such as a camera, which requires the display panel above the photosensitive device such as a camera to have high light transmittance. Further, the inventor researches and discovers that the root cause of the problem is that due to the existence of the patterned film structures in the display screen, external light passes through the patterned film structures, diffraction occurs due to the difference of optical path difference, and further, photographing is blurred, and images are distorted.
In view of the above problems, an embodiment of the present invention provides a display panel, fig. 1 is a top view of the display panel provided by the embodiment of the present invention, and fig. 2 is a cross-sectional view taken along a section line a-a' in fig. 1. Referring to fig. 1 and 2, the display panel includes at least a first display region 1a, the first display region 1a having first sub-pixels 170, the first display region 1a including:
a first substrate 110, the first substrate 110 being a light-transmissive substrate; a first electrode 120 located on one side of the first substrate 110, and a first pixel defining layer 130 located on one side of the first electrode 120 away from the first substrate 110, wherein the first pixel defining layer 130 includes a first pixel opening 131, and the first pixel opening 131 includes a first light emitting layer 140 therein; a second electrode 150 positioned on a side of the first light emitting layer 140 away from the first substrate 110; the first subpixel 170 includes a first electrode 120, a first light emitting layer 140, and a second electrode 150;
the first display region 1a further includes an isolation pillar 160, the isolation pillar 160 is disposed on a side of the first pixel defining layer 130 away from the first substrate 110, and the isolation pillar 160 is used to isolate the adjacent second electrodes 150; the size of the orthogonal projection of the surface of the side of the isolation pillar 160 away from the first substrate 110 on the first substrate 110 is larger than the size of the orthogonal projection of the surface of the side of the isolation pillar 160 close to the first substrate 110 on the first substrate 110, and the surface of the side of the isolation pillar 160 away from the substrate has a concave structure.
Specifically, the first substrate 110 may provide buffering, protection, or support for the display device. The first substrate 110 may be a flexible substrate, and a material of the flexible substrate may be a Polyimide (PI) material. The first substrate 110 may also be a hard substrate, and the material of the hard substrate may be a light-transmitting material such as glass.
The first electrode 120 may be one of an anode and a cathode, and the second electrode 150 is the other. The material of the first electrode 120 and the second electrode 150 may be a light-transmitting material, such as Indium Tin Oxide (ITO), indium zinc oxide (ITO), silver-doped indium tin oxide, or silver-doped indium zinc oxide. The first light emitting layer 140 may be an organic light emitting layer, wherein the organic light emitting layer may include only a single layer structure, for example, only a light emitting material layer; the organic light emitting layer may further include a multi-layer structure, for example, when the first electrode 120 is an anode and the second electrode 150 is a cathode, the organic light emitting layer may include a hole injection layer, a hole transport layer, a light emitting material layer, an electron injection layer, an electron transport layer, and other functional film layers sequentially disposed from the first electrode 120 to the second electrode 150. Referring to fig. 2, the first light emitting layer 140 may include a red light emitting layer 141, a green light emitting layer 142, and a blue light emitting layer 143, and the red light emitting layer 141, the green light emitting layer 142, and the blue light emitting layer 143 are alternately distributed. In other alternatives, the first light emitting layer 140 may further include a red light emitting layer, a green light emitting layer, a blue light emitting layer, and a yellow light emitting layer, and the red light emitting layer, the green light emitting layer, the blue light emitting layer, and the yellow light emitting layer are alternately distributed; in addition, the first light emitting layer 140 may also include only a single color light emitting layer, and the embodiment of the invention is not limited herein.
Referring to fig. 2, the first subpixel 170 includes a first electrode 120, a second electrode 150, and a first light emitting layer 140 between the first electrode 120 and the second electrode 150, when a driving voltage is applied between the first electrode 120 and the second electrode 150 of the first subpixel 170, the first subpixel 170 emits light, and the first display region 1a performs a display function; when no driving voltage is applied between the first electrode 120 and the second electrode 150 of each first sub-pixel 170, the first display region 1a performs a light transmitting function for the light sensing of the light sensing device located below the first display region, so as to realize full-screen display.
The light emission of the first sub-pixel 170 may be an active driving method (AM) or a passive driving method (PM). When the driving mode is the active driving mode, the first electrode 120 and the second electrode 150 of the first sub-pixel 170 may be both electrode blocks, or one of them is an electrode block, and the other is a whole surface electrode. When the driving mode is a passive driving mode, the first electrode 120 and the second electrode 150 may be both electrode strips, the first sub-pixels 170 are arranged in an array, the first electrode 120 and the second electrode 150 respectively extend along the column direction y of the first sub-pixels 170 and the row direction x of the first sub-pixels 170, and the first sub-pixels 170 are located at the intersections of the first electrode 120 and the second electrode 150.
The display panel shown in fig. 1 and 2 emits light in a passive driving manner. In fig. 1 and 2, the first electrodes 120 of the respective first sub-pixels 170 positioned in one column (the direction in which the columns are positioned is the y direction in fig. 1) may be connected together, and the second electrodes 150 of the respective first sub-pixels 170 positioned in one row (the direction in which the rows are positioned is the x direction in fig. 1) may be connected together. Referring to fig. 2, the display panel further includes an isolation pillar 160, where the isolation pillar 160 is disposed on a side of the pixel defining layer away from the first substrate 110, and is used to isolate the adjacent second electrodes 150, so that the adjacent second electrodes 150 cannot be conducted. Fig. 3 is a partial enlarged view of fig. 2, and optionally, in the direction of each column of the first sub-pixels 170, i.e., the y direction, the size of the orthogonal projection of the surface of the side of the isolation pillar 160 away from the first substrate 110 on the first substrate 110 is larger than the size of the orthogonal projection of the surface of the side of the isolation pillar 160 close to the first substrate 110, for example, the isolation pillar 160 may have an inverted trapezoid structure. The surface of the side of the isolation pillar 160 away from the first substrate 110 is defined as a first surface, and the surface of the side of the isolation pillar 160 close to the first substrate 110 is defined as a second surface, because in the direction of each first sub-pixel 170 column, i.e. the y direction, the size of the orthogonal projection of the first surface on the first substrate 110 is greater than the size of the orthogonal projection of the second surface on the first substrate 110, i.e. in the y direction, the first surface protrudes out of the second surface relatively, so that when the second electrode 150 is formed, the second electrode 150 can be at the corresponding position where the first surface protrudes out of the second surface, and the second electrode 150 is isolated by the isolation pillar 160, thereby preventing the second electrode 150 from being connected and short-circuited. Alternatively, the material of the separation column 160 may be an organic glue.
As described above, due to the existence of the patterned film structures in the display panel, after external light passes through the patterned film structures, diffraction occurs due to the difference of optical path differences, resulting in blurred photographing. Further research by the inventor has found that the optical path difference generated by the light passing through the isolation pillars 160 in the display panel is an important cause of the diffraction phenomenon. Referring to fig. 2 and 3, therefore, in the display panel provided in this embodiment, the surface of the isolation pillar 160 on the side away from the first substrate 110 has a recessed structure, and compared with a display panel in which the surface of the existing display panel on the side away from the first substrate 110 is a plane, the difference in thickness of the isolation pillar 160 in the thickness direction of the display panel, that is, the z direction in fig. 2 and 3 is reduced, when light passes through the isolation pillar 160, the difference in optical path is reduced, the diffraction phenomenon is reduced, and the image definition is further improved.
The following description will specifically explain the case shown in fig. 4 and 5. FIG. 4 is a first comparison graph of light passing through two types of spacers according to an embodiment of the present invention, and FIG. 5 is a second comparison graph of light passing through two types of spacers according to an embodiment of the present invention. Referring to fig. 4 and 5, in order to make the optical path of light passing through the isolation pillar 160 clearer, only the isolation pillar structure is shown in fig. 4 and 5, and the isolation pillar having the concave structure on the first surface in fig. 4 and 5 is the isolation pillar in the display panel provided in this embodiment, and the isolation pillar having the planar first surface is the isolation pillar in the display panel in the prior art, and is illustrated as an inverted trapezoid in the display panel in the prior art. Fig. 4 schematically illustrates two different light rays, which are respectively schematically indicated as a first light ray S1 and a second light ray S2, when the first light ray S1 passes through the concave structure portion of the isolation pillar 160 in the display panel provided in the embodiment of the present invention and has an optical path length b11, and the second light ray S2 passes through the concave structure portion of the isolation pillar 160 in the display panel provided in the embodiment of the present invention and has an optical path length b12, in a schematic view of fig. 4; the optical path length of the first light ray S1 passing through the separation column in the prior art display panel is b21, and the optical path length of the second light ray S2 passing through the separation column in the prior art display panel is b22, as can be seen from fig. 4, b11 is b21, b12< b22, and therefore, b12-b11< b22-b 21.
Referring to fig. 5, fig. 5 schematically illustrates two different light rays, which are respectively denoted as a third light ray S3 and a fourth light ray S4, when passing through two types of spacers, wherein the third light ray S3 does not pass through the recessed structure portion of the spacers in the display panel provided in the embodiment of the present invention, and has an optical path length of c11, and the fourth light ray S4 passes through the recessed structure portion of the spacers in the display panel provided in the embodiment of the present invention, and has an optical path length of c 12; the optical path length of the third light ray S3 passing through the separation column in the prior art display panel is c21, and the optical path length of the fourth light ray S4 passing through the separation column in the prior art display panel is c22, as can be seen from fig. 4, c11 is c21, c12< c22, and therefore, c12-c11< c22-c 21.
Therefore, compared with the existing display panel, the display panel provided by the embodiment of the invention can reduce the optical path difference when part of light passes through the isolation column 160, further weaken the diffraction phenomenon, and can enable the image definition to be higher and avoid the problem of fuzzy photographing when the photosensitive device is arranged below the display panel provided by the embodiment of the invention.
In the display panel provided by the embodiment, the first display region includes the isolation pillar, the isolation pillar is disposed on one side of the first pixel defining layer away from the first substrate, and the isolation pillar is used for isolating the adjacent second electrode; the size of the orthogonal projection of the surface of the side, far away from the first substrate, of the isolation column on the first substrate is larger than the size of the orthogonal projection of the surface of the side, far away from the first substrate, of the isolation column on the first substrate, and the surface of the side, far away from the substrate, of the isolation column is provided with a concave structure, so that the isolation column can cut off the second electrode, on the basis of avoiding short circuit, the optical path difference of light passing through the isolation column is reduced, further the diffraction phenomenon is weakened, and when the photosensitive device is arranged below the display panel provided by the embodiment of the invention, the image definition can be higher, and the problem of fuzzy photographing is avoided.
On the basis of the above technical solution, optionally, the isolation column 160 is in an inverted trapezoid shape, and the recessed structure is in a regular trapezoid shape, an inverted trapezoid shape or a rectangular shape.
Specifically, the schematic structural diagram of the display panel with the isolation pillar 160 having an inverted trapezoid shape and the recessed structure having an inverted trapezoid shape can be seen in fig. 2 and 3. Fig. 6 is a cross-sectional view of another display panel according to an embodiment of the present invention, and referring to fig. 6, the entire structure of the isolation pillar 160 in the display panel shown in fig. 6 is a regular trapezoid, and the recessed structure is a regular trapezoid. Fig. 7 is a cross-sectional view of another display panel according to an embodiment of the present invention, and referring to fig. 7, the entire structure of the isolation pillar 160 in the display panel shown in fig. 7 is a regular trapezoid, and the recessed structure is a rectangle. In the display panel shown in fig. 6 and 7, because the surface of the spacer 160 away from the first substrate 110 includes the recessed structure, compared with a display panel in which the surface of the existing display panel away from the first substrate 110 is a plane, the thickness difference of the spacer 160 in the thickness direction of the display panel, that is, the z direction in fig. 2 and 3, is smaller, when light passes through the spacer 160, the optical path difference is reduced, the diffraction phenomenon is reduced, and when the photosensitive device is disposed below the display panel provided in the embodiment, the image definition can be higher, and the problem of blur due to photographing can be avoided.
It should be noted that the shape of the concave structure is not limited to the regular trapezoid, the inverted trapezoid or the rectangle provided in this embodiment, and the surface of the concave structure may also be an arc surface, that is, the cross section of the concave structure may be a circle or an ellipse, and the invention is not limited herein.
Fig. 8 is a schematic structural diagram of an isolation pillar in a display panel according to an embodiment of the present invention, and referring to fig. 8, alternatively, the recessed structure has an inverted trapezoid shape, the isolation pillar includes a first sidewall 161, a second sidewall 162 disposed opposite to each other, and a bottom 163 connecting the first sidewall 161 and the second sidewall 162, and a sidewall thickness of the isolation pillar is consistent with a thickness of the bottom 163.
Specifically, the shape of the recessed structure is the same as the overall shape of the isolation column, and the recessed structure is inverted trapezoid, so that the isolation column can form a structure with the same thickness of the first side wall 161, the second side wall 162 and the bottom 163, and further the thickness of the whole isolation column is uniform.
Fig. 9 is a top view of another display panel according to an embodiment of the invention, and referring to fig. 9, optionally, the first sub-pixel 170 emits light in a passive driving manner; each first electrode 120 extends along a first direction y, each second electrode 150 extends along a second direction x, and the first direction y and the second direction x intersect; the isolation pillar 160 extends along the second direction x, and the isolation pillar 160 is disposed between two adjacent second electrodes 150.
Referring to fig. 9, wherein the first direction y may be a column direction in which the first subpixels 170 are arranged, and the second direction x may be a row direction in which the first subpixels 170 are arranged, the first direction y intersects the second direction x, and the first subpixels 170 are formed at intersections of the first electrodes 120 and the second electrodes 150. The second electrodes 150 extend along the second direction x, so that the second electrodes 150 of the sub-pixels in the same row are connected together to form second electrodes 150, and the extending direction of the isolation pillars 160 is the same as the extending direction of the second electrodes 150 and is disposed between two adjacent second electrodes 150, so that the adjacent second electrodes 150 can be effectively isolated, short circuit caused by the interconnection of the second electrodes 150 is avoided, good display effect of the display panel is ensured, and reliability of the display panel is ensured.
It should be noted that fig. 1 and fig. 9 only illustrate the first electrode 120 and the second electrode 150 in the display panel as strips, wherein the edges of the first electrode 120 and the second electrode 150 may also be wavy, so as to reduce the diffraction effect in the horizontal direction.
Fig. 10 is a cross-sectional view of another display panel according to an embodiment of the present invention, and referring to fig. 10, optionally, distances between different isolation pillars 160 and edges of first pixel openings 131 adjacent to the same side are different along the first direction y.
Specifically, along the first direction y, each of the isolation pillars 160 includes first pixel openings 131 located at both sides of the isolation pillar 160, and three isolation pillars 160 are exemplarily shown in fig. 10, referring to fig. 10, each of the isolation pillars 160 includes first pixel openings 131 located at both left and right sides, and distances of the three isolation pillars 160 from edges of the respective left-side adjacent first pixel openings 131 are e1, e2, and e3, respectively, where e1, e2, and e3 are different in size, and, optionally, distances of each of the isolation pillars 160 from edges of the right-side adjacent first pixel openings 131 thereof are also different. The distance that sets up along first direction y, different insulated column 160 and the adjacent first pixel opening 131 edge of homonymy is different, can be so that insulated column 160 is irregularly arranged, can weaken the periodic coherence when light passes through insulated column 160, and then weakens the interference and the diffraction phenomenon of light, and then sets up the photosensitive element in the display panel below that this embodiment provided, can make the image definition higher, further avoids shooing fuzzy problem.
Fig. 11 is a cross-sectional view of another display panel provided in an embodiment of the invention, and referring to fig. 11, the display panel further includes an encapsulation layer 180, the encapsulation layer 180 is disposed on a side of the second electrode 150 and the partition layer away from the first substrate 110, and the encapsulation layer 180 fills the recess structure;
preferably, the encapsulation layer 180 includes at least one organic layer 181 and at least one inorganic layer 182, which are stacked, and the organic layer 181 fills the recess structure.
Specifically, the encapsulation layer 180 may be a flexible encapsulation layer and a hard encapsulation layer. The packaging layer 180 is filled in the recessed structure, so that the contact area between the packaging layer 180 and the isolation column 160 is increased, the adhesion between the packaging layer 180 and the isolation column 160 is facilitated to be enhanced, the structure of the whole display panel is more compact and firmer, the second electrode 150 and the first light emitting layer 140 can be more firmly jointed under the action of the packaging layer 180, a good display effect is ensured, and the reliability of the display panel is improved.
When the encapsulation layer 180 is a flexible encapsulation layer, it may be a thin film encapsulation layer. The thin film encapsulation layer includes at least one organic layer 181 and at least one inorganic layer 182, which are stacked, and fig. 11 schematically shows a structure in which the thin film encapsulation layer 180 includes one organic layer 181 and one inorganic layer 182, wherein the organic layer 181 is in contact with the isolation pillars 160 and fills the recessed structures of the isolation pillars 160. The organic layer 181 has good flexibility, so that the organic layer 181 fills the concave structure, so that the display panel has good flexibility and is beneficial to bending; also, the organic layer 181 is often formed by ink-jet printing, and the inorganic layer 182 is often formed by deposition, so that the organic layer 181 is easier to fill the recess structure than the inorganic layer 182.
Fig. 12 is a top view of another display panel provided in an embodiment of the present invention, fig. 13 is a cross-sectional view of another display panel provided in an embodiment of the present invention, referring to fig. 12, the display panel further includes a second display area 1b, where fig. 13 may correspond to a cross-sectional view of a part of the second display area 1b in the display panel shown in fig. 12, referring to fig. 12 and fig. 13, where the second display area 1b has a second sub-pixel 270, and the second display area 1b includes:
a second substrate 210, a third electrode 220 located on one side of the second substrate 210, and a second pixel defining layer 230 located on one side of the third electrode 220 away from the second substrate 210, wherein the second pixel defining layer 230 includes a second pixel opening 231, a second light emitting layer 240 is included in the second pixel opening 231, and a fourth electrode 250 is included on one side of the second light emitting layer 240 away from the second substrate 210; the second subpixel 270 includes a third electrode 220, a fourth electrode 250, and a second light emitting layer 240 between the third electrode 220 and the fourth electrode 250;
preferably, the second sub-pixel 270 emits light in an active driving manner, and the third electrode 220 is a block structure;
preferably, the third electrode 220 is a block structure, and the fourth electrode 250 is a surface electrode;
preferably, the second display area 1b completely or partially surrounds the first display area 1 a;
preferably, part of the film layers of the first display area 1a and the second display area 1b are located in the same layer, wherein the part of the film layers of the first display area 1a and the second display area 1b are located in the same layer, and at least one of the following conditions is satisfied: the first electrode and the third electrode 220 are located at the same layer, the first pixel defining layer and the second pixel defining layer 230 are located at the same layer, the first light emitting layer 140 and the second light emitting layer 240 are located at the same layer, and the second electrode 150 and the fourth electrode 250 are located at the same layer;
preferably, the first display region 1a is a transparent display region; the light transmittance of the transparent display area is more than 70%; so as to ensure the photosensitive effect of the photosensitive device arranged in the transparent display area. Preferably, the first electrode is a transparent electrode, and the material of the transparent electrode includes at least one of indium tin oxide, indium zinc oxide, silver-doped indium tin oxide, and silver-doped indium zinc oxide.
Preferably, the display panel further includes a polarizer 290 at least in the second display region 1b, and the polarizer 290 is located on a side of the second electrode 150 away from the second substrate 210.
The second substrate 210 may be a flexible substrate, a rigid substrate, a light-transmitting substrate, or a non-light-transmitting substrate. Optionally, the second substrate 210 and the second substrate 210 may be an integral structure, or may be different substrate structures, and when the whole display panel structure is formed, the two substrates are spliced. The third electrode 220 may be one of an anode and a cathode, and the fourth electrode 250 may be the other of the anode and the cathode. Also, optionally, the third electrode 220 and the first electrode of the first display region 1a are both an anode or a cathode, and the fourth electrode 250 and the second electrode of the first display region 1a are both a cathode or an anode. Optionally, the third electrode 220 is an anode, the fourth electrode 250 is a cathode, and the second light emitting layer 240 is an organic light emitting layer. Referring to fig. 13, the second light emitting layer 240 may include a red light emitting layer 241, a green light emitting layer 242, and a blue light emitting layer 243, and the red light emitting layer 241, the green light emitting layer 242, and the blue light emitting layer 243 are alternately distributed. In other alternatives, the second light emitting layer 240 may further include a red light emitting layer, a green light emitting layer, a blue light emitting layer, and a yellow light emitting layer, and the red light emitting layer, the green light emitting layer, the blue light emitting layer, and the yellow light emitting layer are alternately distributed; in addition, the second light emitting layer 240 may also include only a single color light emitting layer, and the embodiment of the invention is not limited herein.
The third electrode 220, the fourth electrode 250, and the second light emitting layer 240 between the third electrode 220 and the fourth electrode 250 constitute a second sub-pixel 270, and the second sub-pixel 270 may be AM driven or PM driven. When AM driving is performed, the third electrode 220 is a bulk electrode. When the driving is performed by the PM, the third electrode 220 is a stripe electrode and extends along a row (or column) direction, and correspondingly, the fourth electrode 250 is also a stripe electrode and extends along a column (or row) direction, where the row direction may be a row direction in which the second sub-pixels 270 are arranged, the column direction may be a column direction in which the second sub-pixels 270 are arranged, and an intersection of the third electrode 220 and the fourth electrode 250 forms the second sub-pixel 270.
When AM driving is performed, the fourth electrode 250 may be a surface electrode, so as to simplify a pattern structure of the fourth electrode 250 and improve light transmittance.
In an alternative, as shown in fig. 12, the first display region 1a has a separation strip 1c, the longitudinal section of the separation strip 1c may be in an inverted trapezoid shape or a T shape, and the separation strip 1c is an integrally formed structure for automatically separating the second electrode from the fourth electrode 250 when a conductive material layer is evaporated. The above scheme can simplify the opening pattern of the mask plate for evaporating the second electrode and the fourth electrode 250. Specifically, the isolation stripes 1c may be formed simultaneously with the isolation pillars 160 in the first display region 1a, or may be formed separately.
And, optionally, the second display area 1b may completely surround the first display area 1a, or partially surround the first display area 1a, and when the second display area 1b completely surrounds the first display area 1a, the isolation band 1c is a closed loop; in the case where the second display region 1b partially surrounds the first display region 1a, the barrier tape 1c is a non-closed loop, and the display panel shown in fig. 12 schematically shows a case where the second display region 1b partially surrounds the first display region 1 a.
Part of the film layers of the first display area 1a and the second display area 1b are located in the same layer, and at least one of the following conditions is satisfied: the first and third electrodes 220 are located at the same layer, the first and second pixel defining layers 230 are located at the same layer, the first and second light emitting layers 240 are located at the same layer, and the second and fourth electrodes 250 are located at the same layer. Partial film layers of the first display area 1a and the second display area 1b are arranged on the same layer, when the display panel is manufactured, the film layers on the same layer in the first display area 1a and the second display area 1b can be manufactured simultaneously, and the display panel with an integrated structure is formed, so that the process steps are simplified, and the preparation cost is reduced. In addition, when the first display region 1a and the second display region 1b are simultaneously fabricated, and when an array substrate of a display panel is fabricated, a planarization layer, an inorganic layer, and the like in the array substrate may be simultaneously fabricated, so that the overall film heights of the first display region 1a and the second display region 1b are matched. Each film layer of the first display area 1a and the second display area 1b may also be separately manufactured, so that the first display area 1a and the second display area 1b may be manufactured into more flexible shapes, and then the first display area 1a and the second display area 1b are spliced together, for example, the first display area 1a may be a rectangle as shown in fig. 12, or may also be a drop shape, a circle, a trapezoid, a bar shape, or a shape and size of a status bar when displayed by a display panel, which is not specifically limited herein. The display panel provided by the embodiment can realize full-screen display.
Optionally, the first display area 1a may further include an encapsulation layer, a polarizer and a cover plate, which are sequentially disposed on a side of the second electrode away from the substrate, and the second display area 1b and the encapsulation layer 280 (fig. 13 exemplarily shows that the encapsulation layer includes an organic layer 281 and an inorganic layer 282), the polarizer 290 and the cover plate, which are sequentially disposed on a side of the second electrode 250 away from the substrate. The polarizer 290 may be disposed only in the second display region 1b, except for the region corresponding to the first display region 1 a.
The embodiment of the invention also provides a display device which can be a mobile phone, a computer, an intelligent watch, an intelligent bracelet and other equipment. Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 14, the display device 10 includes:
an apparatus body 20 having a device region 21;
and any embodiment of the present invention provides a display panel 1, the display panel 1 is covered on the device body 20;
the device region 21 is located below the first display region 1a of the display panel 1, and a photosensitive device 211 that emits or collects light through the first display region 1a is disposed in the device region 21.
Optionally, the photosensitive device 211 includes: a camera and/or a light sensor; the light sensor includes: one or a combination of an iris recognition sensor and a fingerprint recognition sensor.
An embodiment of the present invention further provides a manufacturing method of a display panel, fig. 15 is a flowchart of the manufacturing method of the display panel provided in the embodiment of the present invention, and referring to fig. 15, the manufacturing method of the display panel includes:
and 360, evaporating a conductive material layer, wherein the conductive material layer is separated by an isolation column to form a second electrode.
Fig. 16 is an intermediate structure diagram of a display panel according to an embodiment of the present invention. Fig. 16 illustrates an intermediate structure diagram corresponding to the step 340 after forming a preformed isolation pillar on a side of the first pixel defining layer 130 away from the first substrate 110, referring to fig. 16, which illustrates fig. 16 with the preformed isolation pillar as an inverted trapezoid, where a surface of the preformed isolation pillar away from the first substrate 110 is a plane, a size of a surface of the preformed isolation pillar away from the first substrate 110 is larger than a size of a surface of the preformed isolation pillar near the first substrate 110, specifically, in the first direction y, a size of a surface of the preformed isolation pillar away from the first substrate 110 is larger than a size of a surface of the preformed isolation pillar near the first substrate 110, so as to ensure that the isolation pillar 160 can block the second electrode after forming the isolation pillar 160.
In the manufacturing method of the display panel provided by this embodiment, the preformed isolation pillar is formed on the side of the first pixel defining layer away from the first substrate, and the size of the orthogonal projection of the surface of the side of the isolation pillar away from the first substrate on the first substrate is larger than the size of the orthogonal projection of the surface of the side of the isolation pillar close to the first substrate on the first substrate; patterning the surface of one side, far away from the first substrate, of the preformed isolation column to form the isolation column of which the surface, far away from one side of the first substrate, of the preformed isolation column comprises a concave structure; and when the photosensitive device is arranged below the display panel provided by the embodiment of the invention, the image definition can be higher, and the problem of fuzzy photographing can be avoided.
On the basis of the foregoing technical solution, optionally, forming a preformed isolation pillar on a side of the first pixel defining layer away from the first substrate includes:
forming a sacrificial layer on one side of the first pixel defining layer far away from the first substrate;
patterning the sacrificial layer to form a first groove on the sacrificial layer;
filling a partition layer material in the first groove to form a plurality of preformed isolation columns;
preferably, after patterning a surface of the preformed pillar on a side away from the first substrate to form a pillar having a recessed structure on a surface of the preformed pillar on a side away from the first substrate, the method further includes:
removing the sacrificial layer by wet etching;
preferably, the sacrificial layer is made of ITO or IGZO, and the etching solution for wet etching comprises oxalic acid;
preferably, the material of the sacrificial layer is molybdenum or titanium, and the etching solution for wet etching includes a mixed solution of nitric acid, acetic acid and phosphoric acid.
Fig. 17 is another intermediate structure diagram of a display panel according to an embodiment of the present invention. Fig. 17 is a structural diagram after the first recess 163 is formed corresponding to the sacrificial layer 162. The material of the sacrificial layer 162 may be ITO and/or IGZO, metallic molybdenum, or titanium. For inorganic ITO and/or IGZO, metallic molybdenum or titanium, physical vapor deposition or chemical vapor deposition is used. The material of the isolation pillars 160 may be an inorganic transparent material or an organic transparent material. The material of the isolation pillars 160 is different from that of the sacrificial layer 162.
When the material of the isolation pillar 160 is an inorganic transparent material, it may be silicon dioxide, silicon nitride, or the like. Each isolation pillar 160 may be formed by photolithography, dry etching, or wet etching.
When the material of the isolation pillar 160 is an organic transparent material, an organic transparent adhesive is preferable. The organic transparent adhesive is obtained by solidifying a liquid organic material, and the liquid organic material has strong liquidity and good filling effect, so that the filling effect of the organic transparent adhesive is good. The material forming the isolation pillars 160 is preferably a photosensitive glue, and the photosensitive glue may be a positive glue or a negative glue. When the photosensitive paste is a positive paste, a first recess 163 corresponding to the preformed isolation pillar may be formed on the surface of the first pixel defining layer 130 on the side away from the substrate before the preformed isolation pillar is preformed, and then the preformed isolation pillar may be formed by filling the positive paste in the first recess 163. When the photosensitive glue is negative glue, the preformed isolation column can be formed by photoetching after the whole surface of the photosensitive glue is directly coated.
When the material of the sacrificial layer 162 is ITO and/or IGZO, oxalic acid is used for removal. Note that, although the material of the first electrode 120 is also ITO, the ITO of the first electrode 120 is subjected to a high-temperature annealing treatment. The oxalic acid can only etch the ITO which is not subjected to the high temperature annealing, but cannot etch the ITO which is subjected to the high temperature annealing, and thus, the performance of the first electrode 120 is not affected when the sacrificial layer 162 is removed.
When the material of the sacrificial layer 162 is molybdenum or titanium, a mixed solution of nitric acid, acetic acid, and phosphoric acid is used for removal.
The sacrificial layer 162 is patterned by wet etching, and the remaining sacrificial layer 162 is removed, so that over-etching can be effectively prevented.
In the manufacturing method of the display panel provided by the embodiment, the sacrificial layer is patterned to form the first groove; the partition layer material is filled in the first groove to form the preformed isolation column, so that the isolation column is fixed in shape, the isolation column is prevented from deforming when being baked in the subsequent display panel manufacturing process, and the isolation column is further guaranteed to have a good partition effect on the second electrode.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A display panel, comprising at least a first display region having a first sub-pixel, the first display region comprising:
the first substrate is a light-transmitting substrate; the first electrode is positioned on one side of the first substrate, and the first pixel defining layer is positioned on one side of the first electrode, which is far away from the first substrate, the first pixel defining layer comprises a first pixel opening, and a first light-emitting layer is arranged in the first pixel opening; a second electrode positioned on the side of the first light-emitting layer away from the first substrate; the first subpixel includes the first electrode, the first light emitting layer, and the second electrode;
the first display area further comprises an isolation column, the isolation column is arranged on one side, away from the first substrate, of the first pixel limiting layer, and the isolation column is used for isolating the adjacent second electrode; the size of the orthogonal projection of the surface of one side, far away from the first substrate, of the isolation column on the first substrate is larger than the size of the orthogonal projection of the surface of one side, near the first substrate, of the isolation column on the first substrate, and the surface of one side, far away from the substrate, of the isolation column is provided with a concave structure.
2. The display panel according to claim 1, wherein the spacers have an inverted trapezoid shape, and the recessed structure has a regular trapezoid shape, an inverted trapezoid shape, or a rectangular shape.
3. The display panel according to claim 2, wherein the recessed structure has an inverted trapezoid shape, the spacers include a first sidewall, a second sidewall and a bottom connecting the first sidewall and the second sidewall, the first sidewall and the second sidewall are disposed opposite to each other, and a thickness of the sidewall of each spacer is equal to a thickness of the bottom.
4. The display panel according to claim 1, wherein the first sub-pixel emits light in a passive driving manner; each of the first electrodes extends in a first direction, each of the second electrodes extends in a second direction, and the first direction and the second direction intersect; the isolation columns extend along the second direction, and are arranged between the adjacent second electrodes.
5. The display panel according to claim 4, wherein the first direction is a direction in which the first pixel opening edge is adjacent to the first pixel opening edge.
6. The display panel according to claim 1, further comprising an encapsulation layer disposed on a side of the second electrode and the partition layer away from the first substrate, the encapsulation layer filling the recessed structure;
preferably, the encapsulation layer includes at least one organic layer and at least one inorganic layer stacked, and the organic layer fills the recess structure.
7. The display panel according to any one of claims 1 to 6, further comprising a second display region having a second sub-pixel, the second display region comprising:
the second substrate, a third electrode positioned on one side of the second substrate, and a second pixel defining layer positioned on one side of the third electrode far away from the second substrate, wherein the second pixel defining layer comprises a second pixel opening, a second light emitting layer is arranged in the second pixel opening, and a fourth electrode is arranged on one side of the second light emitting layer far away from the second substrate; the second sub-pixel includes the third electrode, the fourth electrode, and a second light emitting layer between the third electrode and the fourth electrode;
preferably, the second sub-pixel emits light in an active driving manner, and the third electrode is of a block structure;
preferably, the third electrode is a block structure, and the fourth electrode is a surface electrode;
preferably, the second display area completely or partially surrounds the first display area;
preferably, part of the film layers of the first display area and the second display area are located in the same layer, wherein the part of the film layers of the first display area and the second display area are located in the same layer, and at least one of the following conditions is satisfied: the first electrode and the third electrode are located in the same layer, the first pixel defining layer and the second pixel defining layer are located in the same layer, the first light emitting layer and the second light emitting layer are located in the same layer, and the second electrode and the fourth electrode are located in the same layer;
preferably, the first display area is a transparent display area;
preferably, the light transmittance of the transparent display region is greater than 70%;
preferably, the first electrode is a transparent electrode, and the material of the transparent electrode comprises at least one of indium tin oxide, indium zinc oxide, silver-doped indium tin oxide and silver-doped indium zinc oxide;
preferably, the display panel further includes a polarizer at least located in the second display region, and the polarizer is located on a side of the second electrode away from the second substrate.
8. A display device, comprising:
an apparatus body having a device region;
and the display panel of any one of claims 1-7 overlaid on the device body;
the device area is located below a first display area of the display panel, and a photosensitive device which transmits light to the first display area or collects light is arranged in the device area.
9. A method for manufacturing a display panel is characterized by comprising the following steps:
providing a first substrate, wherein the first substrate is a light-transmitting substrate;
forming a first electrode on one side of the first substrate;
forming a first pixel defining layer on one side of the first electrode, the first pixel defining layer including a first pixel opening;
forming a first light emitting layer within the first pixel opening; forming a preformed isolated column on a side of the first pixel defining layer away from the first substrate, wherein an orthogonal projection of a side surface of the preformed isolated column away from the first substrate on the first substrate has a size larger than that of an orthogonal projection of a side surface of the preformed isolated column close to the first substrate on the first substrate;
patterning the surface of one side, far away from the first substrate, of the preformed isolation column to form the isolation column of which the surface, far away from one side of the first substrate, of the preformed isolation column comprises a concave structure;
and evaporating a conductive material layer, wherein the conductive material layer is separated by the isolation column to form a second electrode.
10. The method of manufacturing a display panel according to claim 9, wherein the forming of the preformed spacers on the first pixel defining layer on a side away from the first substrate includes:
forming a sacrificial layer on a side of the first pixel defining layer away from the first substrate;
patterning the sacrificial layer to form a first groove on the sacrificial layer;
filling a partition layer material in the first groove to form the preformed isolation column;
preferably, after patterning a surface of the preformed isolation pillar on a side away from the first substrate to form an isolation pillar with a recessed structure on a surface on a side away from the first substrate, the method further includes:
removing the sacrificial layer by wet etching;
preferably, the sacrificial layer is made of indium tin oxide or indium gallium zinc oxide, and the etching solution for wet etching comprises oxalic acid;
preferably, the sacrificial layer is made of molybdenum or titanium, and the etching solution for wet etching includes a mixed solution of nitric acid, acetic acid and phosphoric acid.
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