CN111180493B - Display panel, manufacturing method thereof and display device - Google Patents

Display panel, manufacturing method thereof and display device Download PDF

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Publication number
CN111180493B
CN111180493B CN202010002480.0A CN202010002480A CN111180493B CN 111180493 B CN111180493 B CN 111180493B CN 202010002480 A CN202010002480 A CN 202010002480A CN 111180493 B CN111180493 B CN 111180493B
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layer
substrate
optical
complementary
electrode layer
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CN111180493A (en
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任雅磊
郭双
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Kunshan New Flat Panel Display Technology Center Co Ltd
Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan New Flat Panel Display Technology Center Co Ltd
Kunshan Govisionox Optoelectronics Co Ltd
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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
    • 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
    • H10K59/123—Connection of the pixel electrodes to the thin film transistors [TFT]
    • 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
    • H10K59/126—Shielding, e.g. light-blocking means over the TFTs
    • 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
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors

Abstract

The invention provides a display panel, a manufacturing method thereof and a display device. The display panel includes: a substrate; a plurality of discrete electrode layers with spacers between adjacent electrode layers; the optical complementary layers are used for improving the consistency of light transmission directions of outside light after passing through the area corresponding to the spacing area and the area corresponding to the electrode layer. Through the optical complementary layer which is arranged corresponding to the position of the interval area between the electrode layers, the optical complementary layer is used for improving the consistency of the light transmission directions of the outside light after passing through the area corresponding to the interval area and after passing through the area corresponding to the electrode layers, so that the optical diffraction phenomenon of the light collecting area under the screen is reduced, and the imaging quality of the shooting equipment under the screen is improved.

Description

Display panel, manufacturing method thereof and display device
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel, a manufacturing method of the display panel and a display device.
Background
The terminal devices such as mobile phones and tablet computers generally have functional devices such as cameras, speakers and earphones besides the display screen. Along with the continuous intellectualization and the mobility of the terminal equipment, the functions of the terminal equipment are continuously enriched, and more functional devices are arranged in the terminal equipment.
In order to increase the display screen ratio of the terminal device, a display panel applied to a full screen technology is developed. However, the performance of the existing display panel still needs to be improved.
Disclosure of Invention
The embodiment of the invention provides a display panel, a manufacturing method thereof and a display device, and improves the performance of the display panel.
An embodiment of the present invention provides a display panel, including: the substrate comprises a light collecting area, and external shooting equipment is arranged below the substrate of the light collecting area; a plurality of discrete electrode layers located in the light collecting area, and a spacing area is arranged between every two adjacent electrode layers; the optical complementary layers are used for improving the consistency of light transmission directions of outside light after passing through the area corresponding to the spacing area and the area corresponding to the electrode layer.
In addition, the absolute value of the difference between the refractive index of the electrode layer and the refractive index of the optically complementary layer is less than or equal to 0.1; preferably, the refractive index of the electrode layer is the same as the refractive index of the optically complementary layer; preferably, the absolute value of the difference between the extinction coefficient of the electrode layer and the extinction coefficient of the optically complementary layer is less than or equal to 0.01; preferably, the extinction coefficient of the electrode layer is the same as the extinction coefficient of the optically complementary layer. Because the refractive index of the electrode layer is close to or the same as that of the optical complementary layer, and the extinction coefficient of the electrode layer is close to or the same as that of the optical complementary layer, namely, the optical performance difference between the optical complementary layer and the electrode layer is very small or even the same as that of the electrode layer, the problem of optical path difference caused by the difference between the optical performance of the optical complementary layer and the optical performance of the electrode layer can be reduced as much as possible, and the problem of light diffraction is further improved.
In addition, the material of the optical complementary layer is the same as that of the electrode layer; or the material of the optical complementary layer is an insulating material. The electrode layer and the optical complementary layer made of the same material have the same optical property, so that the optical diffraction condition of a camera area under a screen can be further reduced; and the material of the optical complementary layer can avoid the electric connection between the electrode layers when being an insulating material, and the electrode layers and the optical complementary layer can be arranged in the same layer because the optical complementary layer is an insulating material, thereby being beneficial to reducing the thickness of the display panel.
In addition, the orthographic projection of the spacer region on the substrate is completely coincident with the orthographic projection of the optical complementary layer on the substrate; or the orthographic projection of the optical complementary layer on the substrate is within the orthographic projection of the spacer on the substrate, or the orthographic projection of the spacer on the substrate is within the orthographic projection of the optical complementary layer on the substrate; preferably, in a direction parallel to the arrangement direction of the adjacent electrode layers, a distance between a side wall of the optically complementary layer close to the electrode layer and a side wall of the electrode layer close to the optically complementary layer is less than or equal to 0.3 μm. The distance between the opposite side surfaces of the optical complementary layer and the electrode layer is in a small range, so that the optical diffraction condition can be further reduced, and the requirement on the manufacturing precision of the display panel is lowered.
In addition, the electrode layer and the optical complementary layer are arranged in the same layer or different layers; preferably, when the electrode layer and the optical complementary layer are disposed on the same layer, the material of the optical complementary layer is an insulating material. Various dispositions of the electrode layer and the optically complementary layer are provided.
In addition, the display panel further includes: a planarization layer, wherein the planarization layer is internally provided with holes extending along the direction of the planarization layer towards the substrate, one of the electrode layer or the optical complementary layer is positioned at the bottom of the holes, and the other one of the electrode layer or the optical complementary layer is positioned on the surface of the planarization layer away from the substrate between the adjacent holes; preferably, the electrode layer is located on the surface of the planarization layer away from the substrate between adjacent holes, and the optically complementary layer is located at the bottom of the holes. The hole is formed in the planarization layer, so that the spacing area between the optical complementary layer and the adjacent electrode layer can be accurately and oppositely arranged conveniently, alignment is not needed when the optical complementary layer or the electrode layer is formed, and the manufacturing process of the display panel is simplified.
In addition, the holes are blind holes or through holes; preferably, the cross-sectional shape of the hole is a regular trapezoid on a cross section perpendicular to the substrate surface and parallel to the direction in which the adjacent electrode layers are arranged. The regular trapezoid-shaped opening is formed in the planarization layer, so that the possibility of electrical connection between the electrode layer and the optical complementary layer can be reduced, and the stability of the display panel is guaranteed while the optical diffraction condition is reduced.
Correspondingly, the embodiment of the invention also provides a display device, which comprises any one of the display panel and the shooting equipment, wherein the shooting equipment is positioned below the lighting area.
Correspondingly, the embodiment of the invention also provides a manufacturing method of the display panel, which comprises the following steps: providing a substrate, wherein the substrate comprises a light collecting area, and an external shooting device is arranged below the substrate in the light collecting area; forming a plurality of discrete electrode layers in the lighting area, wherein a spacing area is arranged between every two adjacent electrode layers; and forming a plurality of discrete optical complementary layers, wherein orthographic projections of the optical complementary layers on the substrate are at least partially overlapped with orthographic projections of the spacers on the substrate, and the optical complementary layers are used for improving the consistency of light transmission directions of outside light after passing through the regions corresponding to the spacers and the regions corresponding to the electrode layers.
In addition, before forming the electrode layer and the optical complementary layer, the method further includes: forming a planarization layer on the substrate; the process steps for forming the electrode layer and the optical complementary layer comprise: forming a hole in the planarization layer; forming the electrode layer and the optical complementary layer, one of the electrode layer or the optical complementary layer is positioned at the bottom of the hole, and the other one is positioned on the surface of the planarization layer away from the substrate between the adjacent holes; preferably, the cross-sectional shape of the hole is a regular trapezoid on a cross section perpendicular to the surface of the substrate and parallel to the arrangement direction of the adjacent electrode layers; preferably, the electrode layer and the optically complementary layer are formed in the same process step.
The hole is formed in the planarization layer in advance, the electrode layer and the optical complementary layer are formed in the same process step at the same time, the process steps are simplified, the electrode layer and the optical complementary layer are made of the same material, and the electrode layer and the optical complementary layer can have the same optical property, so that the optical path difference generated between the region corresponding to the interval region and the region corresponding to the electrode layer through outside light is further reduced, the optical diffraction condition is further reduced, and the imaging quality of the camera under the screen is improved.
The optical complementary layer is correspondingly arranged in the spacer region, so that the consistency of the light transmission directions of the external light passing through the region corresponding to the spacer region and the region corresponding to the electrode layer is improved, the optical path difference between the optical path of the external light passing through the region corresponding to the electrode layer and the optical path of the external light passing through the region corresponding to the spacer region is reduced, the slit diffraction problem caused by the spacer region existing between the adjacent electrode layers is weakened or even eliminated, the light diffraction problem is improved, and the performance of the display panel is improved. Furthermore, when the shooting device is arranged in the corresponding area of the optical complementary layer, the problem of light diffraction can affect the view finding effect of the shooting device, and the view finding effect is blurred and disordered.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic cross-sectional view of a display panel according to a first embodiment of the invention;
fig. 2 is a partially enlarged schematic view of another cross-sectional structure of a display panel according to a first embodiment of the invention;
FIG. 3 is a partially enlarged schematic view of a cross-sectional structure of a display panel according to a first embodiment of the invention;
fig. 4 is a schematic cross-sectional view of a display panel according to a second embodiment of the invention;
fig. 5 is a schematic cross-sectional view of a display panel according to a third embodiment of the invention;
fig. 6 is a schematic cross-sectional view of a display panel according to a third embodiment of the invention;
fig. 7 and fig. 8 are schematic cross-sectional views illustrating steps of a method for manufacturing a display panel according to a fifth embodiment of the present invention;
fig. 9 to 11 are schematic cross-sectional structures corresponding to steps of a display panel manufacturing method according to a sixth embodiment of the invention.
Detailed Description
As is known in the art, the performance of the display panel needs to be improved.
The inventor analyzes and finds that metal wiring used as an anode or a cathode exists in the display panel, and the existence of the metal wiring causes problems such as diffraction of light during lighting of shooting equipment such as a camera and the like, influences the viewing effect and causes blurring and confusion of the viewing effect.
Further analysis has found that the causes of the diffraction problems of light include: a slit exists between adjacent metal wirings, the optical performance of the slit area is different from that of the metal wirings, for example, the refractive index is different, so that the refraction degree of the external light is different between the area where the metal wirings are located and the area where the slit is located, the transmission direction of the light is greatly different, and further, the optical path difference between the optical path from the area where the metal wirings are located to the shooting equipment and the optical path from the area where the slit is located to the shooting equipment is large, namely, the direction of the light reaching the shooting equipment is disordered, the obvious diffraction problem is generated, and the shooting effect is influenced.
In order to solve the above problem, an embodiment of the present invention provides a display panel, which includes a substrate, where the substrate includes a light collecting region, and an external shooting device is disposed below the light collecting region of the substrate; a plurality of discrete electrode layers located in the light collecting area, and a spacer area is arranged between adjacent electrode layers; the optical complementary layers are used for improving the consistency of light transmission directions of outside light after passing through the area corresponding to the spacing area and the area corresponding to the electrode layer. The arrangement of the optical complementary layer can reduce the optical path difference of external light transmission caused by the difference between the electrode layer and the spacer region, further reduce the optical diffraction phenomenon caused by the optical complementary layer and improve the performance of the display panel. For example, when the off-screen camera is applied to the display panel, the off-screen camera has a better imaging effect.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Fig. 1 is a schematic cross-sectional view of a display panel according to a first embodiment of the present invention, fig. 2 is a partially enlarged schematic cross-sectional view of another cross-sectional structure of the display panel according to the first embodiment of the present invention, and fig. 3 is a partially enlarged schematic cross-sectional view of yet another cross-sectional structure of the display panel according to the first embodiment of the present invention.
Referring to fig. 1, in the present embodiment, the display panel includes: the substrate 100 comprises a light collecting area 10, and an external shooting device is arranged below the light collecting area 10 of the substrate 100; a plurality of discrete electrode layers 101 located in the light collecting region 10, and a spacer region 102 is arranged between adjacent electrode layers 101; the plurality of discrete optical complementary layers 103 are used for improving the light transmission direction consistency of the outside light after passing through the region corresponding to the spacer region 102 and after passing through the region corresponding to the electrode layer 101, and the orthographic projection of the optical complementary layers 103 on the substrate 100 is at least partially overlapped with the orthographic projection of the spacer region 102 on the substrate 100.
The display panel provided in the present embodiment will be described in detail below with reference to fig. 1.
The display panel may be an OLED display panel, an LCD display panel, an LED display panel, or a Micro-LED display panel. Taking the display panel as an OLED display panel as an example, the OLED display panel may be a top emission display panel or a bottom emission display panel.
The substrate 100 includes a base and a driving device layer on the base. In this embodiment, the display panel may be applied to a flexible display device, and the corresponding substrate is a flexible substrate made of Polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or Polyimide (PI). The substrate may also be an ultra-thin glass substrate having a thickness of less than 50 μm.
The driving device layer provides a driving signal for light emission of the light emitting cells in the display panel. In this embodiment, the driving device layer has a Thin Film Transistor (TFT) therein, and the TFT may be a Low Temperature Polysilicon (LTPS) TFT. The driving device layer comprises a multi-layer film structure, and specifically comprises: an active layer; the grid structure is positioned on the active layer and comprises a grid dielectric layer and a grid electrode layer positioned on the grid dielectric layer; a source region (source) in the active layer at one side of the gate structure, and a drain region (drain) in the active layer at the other side of the gate structure; a dielectric layer covering the gate structure and the active layer; the source electrode penetrates through the dielectric layer and is electrically connected with the source region; and the drain electrode penetrates through the dielectric layer and is electrically connected with the drain region.
It will be appreciated that the driver device layer may also include other film layer structures, and the above is merely illustrative of the most common thin film transistor structures.
In this embodiment, the electrode layer 101 is an anode of the display panel and is electrically connected to a source or a drain in the driving device layer. The display panel may further include: a light emitting unit located on the surface of the electrode layer 101 away from the substrate 100; and a cathode on a side of the light emitting unit away from the electrode layer 101. The light emitting unit may include: a Hole Injection Layer (HIL), a Hole Transport Layer (HTL) on the Hole injection Layer, an emission Layer (EML) on the Hole Transport Layer, an Electron Transport Layer (ETL) on the emission Layer, and an Electron Injection Layer (EIL) on the Electron Transport Layer.
In order to improve the light transmittance of the display panel, the electrode layer 101 is a transparent electrode; the material of the electrode layer 101 includes ITO (indium tin oxide), IZO (zinc tin oxide), or Ag. In this embodiment, the electrode layer 101 is a stacked structure, specifically, a stacked structure of an ITO layer/an Ag layer/an ITO layer.
Since different electrode layers 101 are electrically insulated from each other, a spacer 102 is provided between adjacent electrode layers 101. In the present embodiment, the adjacent electrode layers 101 are arranged at equal intervals as an example, and the corresponding adjacent spacers 102 are also arranged at equal intervals. In other embodiments, the spacing between adjacent electrode layers may also be different.
In other embodiments, the electrode layer may be a cathode of the display panel.
The display panel further includes: a planarization layer 104, the planarization layer 104 is located on a side of the substrate 100 facing the electrode layer 101, and the electrode layer 101 is located on a surface of the planarization layer 104 away from the substrate 100. It is understood that the display panel may further include a conductive via penetrating the planarization layer 104, and the electrode layer 101 is electrically connected with the source or drain in the driving device layer through the conductive via in the planarization layer 104.
In this embodiment, the material of the planarization layer 104 is silicon oxide.
In this embodiment, the optical complementary layer 103 is located on a surface of the planarization layer 104 facing the substrate 100, that is, the optical complementary layer 103 and the electrode layer 101 are respectively located on two opposite sides of the planarization layer 104. And the optical complementary layer 103 is arranged opposite to the spacer region 102, i.e. the orthographic projection of the optical complementary layer 103 on the substrate 100 at least partially overlaps with the orthographic projection of the spacer region 102 on the substrate 100. The optical complementary layer 103 is used for improving the consistency of the light transmission direction of the external light after passing through the region corresponding to the spacer region 102 and the region corresponding to the electrode layer 101. That is, the optical complementary layer 103 is used to reduce the optical path length difference between the region corresponding to the spacer region 102 and the region corresponding to the electrode layer 101, thereby improving the performance of the display panel.
More specifically, the substrate 100 has a light collecting region 10, the optical complementary layer 103 is located in a region corresponding to the light collecting region 10, and an external shooting device is disposed below the light collecting region 10 of the substrate 100 for capturing external light to implement a shooting function or a positioning function. It can be understood that the display panel may further have a main screen area, the corresponding lighting area corresponds to a sub-screen area, the area corresponding to the main screen area does not need to be provided with a shooting device, the optical complementary layer is only arranged in the lighting area, i.e. the sub-screen area, and the optical complementary layer is not required to be arranged in the main screen area.
After passing through the electrode layer 101, the light transmission direction of the external light deviates to a certain degree to form a first deviation light, and the first deviation light continues to be transmitted to the light collecting area 10; due to the arrangement of the optical complementary layer 103, the external light also has a certain degree of transmission direction deviation after passing through the spacer region 102 and the optical complementary layer 103, so as to form a second deviation light, and the second deviation light continues to be transmitted to the light collection region 10; because the direction difference between the first offset light and the second offset light is small, the problem that the direction of the light reaching the light collecting region 10 is disordered can be avoided, so that the optical path difference between the optical path of the external light reaching the light collecting region 10 through the region corresponding to the spacer region 102 and the optical path of the external light reaching the light collecting region 10 through the region corresponding to the electrode layer 101 is small, the problem of light diffraction is solved, and the accuracy of light information capture of the light collecting region 10 is improved.
For example, when the shooting device provided in the lighting area 10 is a camera, the problem of light diffraction in the process of camera view finding can be improved, the view finding effect can be improved, the view finding accuracy can be improved, and the problem of view finding confusion can be avoided.
In this embodiment, the optical complementary layer 103 is located on a surface of the planarization layer 104 facing the substrate 100, that is, the electrode layer 101 and the optical complementary layer 103 are respectively located on opposite surfaces of the planarization layer 104.
In this embodiment, the optical complementary layer 103 and the electrode layer 101 are disposed in different layers, and it is known that the optical complementary layer 103 and the electrode layer 101 may also be disposed in the same layer. The present invention is not limited to a specific arrangement.
In order to further improve the directional consistency between the first and second shifted light rays, the absolute value of the difference between the refractive index of the electrode layer 101 and the refractive index of the optically complementary layer 103 is less than or equal to 0.1.
Further, the absolute value of the difference between the refractive index of the electrode layer 101 and the refractive index of the optically complementary layer 103 is 0.01, 0.02, 0.04, 0.05, 0.06, or 0.08. By setting the difference range, the difference between the transmission directions of the external light reaching the light collecting region 10 through the region corresponding to the electrode layer 101 and the region corresponding to the optical complementary layer 103 can be further reduced, so as to weaken the optical diffraction phenomenon of the light collecting region 10.
In this embodiment, the refractive index of the electrode layer 101 is the same as that of the optical complementary layer 103, so as to further ensure the consistency of the deflection directions of the light beams passing through the electrode layer 101 and the optical complementary layer 103 after passing through the external light, thereby further improving the consistency of the transmission directions of the light beams reaching the light collecting region 10, and further improving the diffraction problem of the light beams.
In addition, in order to reduce the difference between the degrees of absorption of the electrode layer 101 and the external light by the optically complementary layer 103, and further improve the performance of the display panel, the absolute value of the difference between the extinction coefficient of the electrode layer 101 and the extinction coefficient of the optically complementary layer 103 is less than or equal to 0.01. In this way, the degree of absorption of the external light through the electrode layer 101 is close to the degree of absorption of the external light through the optical complementary layer 103, that is, the degree of light loss is close, so as to further avoid the adverse effect of the arrangement of the optical complementary layer 103 on the degree of light absorption.
Further, the absolute value of the difference between the extinction coefficient of the electrode layer 101 and the extinction coefficient of the optically-complementary layer 103 is 0.001, 0.002, 0.004, 0.005, 0.006, or 0.008. By adopting the optical complementary layer 103 with the extinction coefficient difference, a smaller light absorption difference can be further ensured after the external light passes through the region corresponding to the electrode layer 101 and the region corresponding to the optical complementary layer 103, so that the consistency of the external light after reaching the light collecting region 10 is improved, and the light diffraction influence is weakened.
In this embodiment, the extinction coefficient of the electrode layer 101 is the same as that of the optically complementary layer 103. It is understood that, in the present embodiment, the material of the optically complementary layer 103 may be the same as the material of the electrode layer 101, and the thickness of the optically complementary layer 103 may be the same as the thickness of the electrode layer 101. Thus, the electrode layer 101 and the optical complementary layer 103 are made of the same material, so that the electrode layer 101 and the optical complementary layer 103 have the same optical properties such as refractive index, extinction coefficient, transmittance and the like, thereby ensuring that the external light passing through the region corresponding to the electrode layer 101 and the light passing through the region corresponding to the optical complementary layer 103 are deflected to the same degree and absorbed to the same degree, improving the consistency and uniformity of the transmission direction after the external light reaches the light collection region 10, and further improving the imaging quality of the light collection region 10.
In the present embodiment, as shown in fig. 1, the orthographic projection of the optical complementary layer 103 on the substrate 100 completely coincides with the orthographic projection of the spacer region 102 on the substrate 100, that is, the boundary of the orthographic projection of the optical complementary layer 103 on the substrate 100 overlaps with the boundary of the orthographic projection of the electrode layer 101 on the substrate 100. For the external light, the electrode layer 101 and the light complementary layer 103 are equivalent to a continuous and complete optical medium layer, so that the deflection degree of the transmission direction of the external light after passing through the optical medium layer is consistent, the consistency of the light transmission direction of the external light reaching the light collecting region 10 is high, the optical path difference of the external light reaching the light collecting region 10 through the region corresponding to the electrode layer 101 and the region corresponding to the spacer region 102 is reduced, the optical diffraction condition generated by the optical path difference is weakened, and the imaging quality of the shooting device of the light collecting region 10 is improved. It is understood that the optical path difference in this embodiment may be zero ideally.
In other embodiments, referring to fig. 2, the orthographic projection of the optically complimentary layer 103 on the substrate 100 may also be within the orthographic projection of the spacer region 102 on the substrate 100. Therefore, the requirement for the alignment precision between the optical complementary layer 103 and the electrode layer 101 is favorably reduced, and the manufacturing difficulty of the display panel is reduced. As shown in fig. 2, in the direction parallel to the arrangement direction of the adjacent electrode layers 101, the width of the optical complementary layer 103 is smaller than the width of the spacer region 102, and the distance between the sidewall of the optical complementary layer 103 close to the electrode layer 101 and the sidewall of the electrode layer 101 close to the optical complementary layer 103 is a first distance X, and the first distance X is less than or equal to 0.3 μm. In the distance range, the difficulty in manufacturing the display panel is reduced, and the problem of light diffraction is improved. Further, the first distance X is 0.08 μm, 0.2 μm, and 0.24 μm, which is beneficial to further reducing the alignment precision between the optical complementary layer 103 and the electrode layer 101, and further reducing the manufacturing difficulty of the display panel.
In other embodiments, referring to fig. 3, the orthographic projection of the spacer region 102 on the substrate 100 may also be within the orthographic projection of the optically complementary layer 103 on the substrate 100. Therefore, the requirement for the alignment accuracy between the optical complementary layer 103 and the electrode layer 101 is reduced, and the manufacturing difficulty of the display panel is reduced. As shown in fig. 3, in the direction parallel to the arrangement direction of the adjacent electrode layers 101, the width of the optical complementary layer 103 is greater than the width of the spacer region 102, and the distance between the sidewall of the optical complementary layer 103 close to the electrode layer 101 and the sidewall of the electrode layer 101 close to the optical complementary layer 103 is a second distance Y, which is less than or equal to 0.3 μm. Therefore, the overlapping area of the electrode layer 101 and the optical complementary layer 103 is small, so that the manufacturing difficulty of the display panel is reduced, and the adverse effect of the overlapping area on the transmission direction of the external light is favorably reduced, thereby further improving the performance of the display panel. Further, the second distance Y is 0.08 μm, 0.2 μm, and 0.24 μm, which is beneficial to further reducing the alignment precision between the optical complementary layer 103 and the electrode layer 101, and further reducing the manufacturing difficulty of the display panel.
If the second distance Y is too large, the area of the overlapping region is too large, and the overlapping region may have a bad influence on the transmission direction of the external light, for example, the difference between the transmission direction of the external light passing through the overlapping region and the transmission direction of the external light in other regions is large, which may affect the performance of the display panel.
The surface of the optical complementary layer 103 far away from the substrate 100 is spaced from the surface of the electrode layer 101 facing the substrate 100, and a part of the external light transmitted from the region corresponding to the spacer region 102 easily escapes from the gap between the optical complementary layer 103 and the electrode layer 101 and is emitted to the region corresponding to the electrode layer 101, so that the external light in the region corresponding to the electrode layer 101 is affected by diffraction. Therefore, if the above-mentioned distance is too large, that is, the distance between the optical complementary layer 103 and the spacer region 102 is too large, more external light may be emitted to the region corresponding to the electrode layer 101 without passing through the optical complementary layer 103, accordingly, the phase of the external light transmitted through the region corresponding to the electrode layer 101 is not consistent with the phase of the external light escaping from the gap between the electrode layer 101 and the optical complementary layer 103, and the external light may have a difference in optical path length when reaching the light collecting region 10, thereby causing an optical diffraction phenomenon.
For this purpose, the distance between the surface of the electrode layer 101 facing the substrate 100 and the surface of the optically complementary layer 103 facing away from the substrate 100 in the direction along the substrate 100 pointing towards the electrode layer 101 is less than or equal to 200nm. Thus, the amount of the external light escaping through the gap between the electrode layer 101 and the optical complementary layer 103 is reduced, thereby improving the problem of the optical path difference of the escaping external light when reaching the light collecting region 10, further improving the problem of diffraction of the light, and further improving the performance of the display panel.
In this embodiment, the materials of the optical complementary layer 103 and the electrode layer 101 are the same and are both conductive materials, and in order to further avoid the problem that the optical complementary layer 103 causes signal interference on the electrode layer 101, the distance between the surface of the electrode layer 101 facing the substrate 100 and the surface of the optical complementary layer 103 away from the substrate 100 is greater than or equal to 100nm.
It will be appreciated that in other embodiments, where the material of the optically complimentary layer is an insulating material, then signal interference issues need not be considered. Further, the distance between the surface of the electrode layer 101 facing the substrate 100 and the surface of the optically complementary layer 103 facing away from the substrate 100 is 120nm, 140nm, 150nm, 160nm or 180nm. By adopting the optical complementary layer 103 with the above distance, the anti-diffraction effect of the display panel can be further improved to improve the imaging quality of the camera under the screen, and the possibility of electrical connection between the electrode layer 101 and the optical complementary layer 103 is reduced, so that the stability of the display panel is improved.
The display panel further includes: a pixel defining layer 105, wherein the pixel defining layer 105 is located on the planarization layer 104 and the surface of the electrode layer 101 away from the substrate 100, and exposes a portion of the surface of the electrode layer 101 away from the substrate 100; an isolation pillar 106 located on the surface of the pixel defining layer 105 away from the substrate 100; and an encapsulation layer, which may include a first inorganic layer 107, an organic layer 108, and a second inorganic layer 109 sequentially stacked.
The display panel provided by the embodiment is provided with the optical complementary layer 103, the orthographic projection of the optical complementary layer 103 on the substrate 100 is at least partially overlapped with the orthographic projection of the spacer region 102 between the adjacent electrode layers 101 on the substrate 100, and the optical complementary layer 103 can reduce the optical path difference between light rays transmitted from the region corresponding to the electrode layer 101 and the region corresponding to the spacer region 102, so that the optical diffraction phenomenon of the light rays after transmitting through the electrode layer 101 and the spacer region 102 is weakened, and the imaging quality of the camera under the screen is improved.
A second embodiment of the present invention further provides a display panel, which is different from the previous embodiment in that the display panel provided by the present embodiment further includes a planarization layer, the electrode layer is located on a surface of the planarization layer away from the substrate, and the optical complementary layer is located on a surface of the planarization layer away from the substrate. Fig. 4 is a schematic cross-sectional structure diagram of a display panel according to a second embodiment of the invention.
It should be noted that, for the same or corresponding parts as those in the previous embodiment, please refer to the previous embodiment in detail, and detailed description thereof will not be repeated.
Referring to fig. 4, in the present embodiment, the display panel includes: a substrate 200, an electrode layer 201, an optical complementary layer 202, and a planarization layer 203.
In this embodiment, the electrode layer 201 is located on the surface of the planarization layer 203 away from the substrate 200, and the optical complementary layer 202 is located on the surface of the planarization layer 203 away from the substrate 200, that is, both the optical complementary layer 202 and the electrode layer 201 are located on the surface of the planarization layer 203 away from the substrate 200, and the optical complementary layer 202 is located in the space between the adjacent electrode layers 201. In this embodiment, the optical complementary layer 202 and the electrode layer 201 are disposed in the same layer.
In this embodiment, the optical complementary layer 202 is filled in the spacer, and an orthogonal projection of the spacer on the substrate 200 completely coincides with an orthogonal projection of the optical complementary layer 202 on the substrate 200, that is, the adjacent optical complementary layer 202 is in contact with the opposite sidewalls of the electrode layer 201, that is, the optical complementary layer 202 and the electrode layer 201 together form a continuous and complete optical medium layer.
Due to the arrangement, the accurate alignment of the electrode layer 201 and the optical complementary layer 202 does not need to be considered in the manufacturing process, and the situation that an overlapping region or a gap exists between the orthographic projection of the electrode layer 201 on the substrate 200 and the orthographic projection of the optical complementary layer 202 on the substrate 200 is avoided, so that when external light passes through the region corresponding to the electrode layer 201 and the region corresponding to the spacer region, all the passing external light is deflected to the same degree, the consistency of the light transmission direction reaching the light collecting region 20 is high, and the optical diffraction phenomenon generated by the deflection is weakened.
In this embodiment, in order to avoid the optical complementary layer 202 from adversely affecting the electrical connection of the electrode layer 201, the material of the optical complementary layer 202 may be an insulating material. Since the optical complementary layer 202 is made of an insulating material, the problem of signal interference caused by the optical complementary layer 202 to the electrode layer 201 does not need to be considered, and the stability of the display function of the display panel is improved.
The insulating material with optical property similar to or the same as that of the electrode layer 201 is used as the optical complementary layer 202, the influence of the optical complementary layer 202 on the transmission of electric signals of the electrode layer 201 does not need to be considered, and the optical complementary layer 202 and the electrode layer 201 form a continuous and flat optical medium layer, so that the deflection degree of the transmission direction of external light passing through the optical medium layer is consistent, the diffraction condition of the display panel is reduced, and the optical complementary layer 202 and the electrode layer 201 are positioned on the same surface of the planarization layer 203, so that the whole thickness of the display panel can be obviously reduced, and the manufacturing process is simplified.
In order to further improve the consistency of the deflection degree of the external light transmitted through the electrode layer 201 and the external light transmitted through the optical complementary layer 202, the absolute value of the difference between the refractive indexes of the electrode layer 201 and the optical complementary layer 202 is less than or equal to 0.1.
Further, the absolute value of the difference between the refractive indexes of the electrode layer 201 and the optically complementary layer 202 is 0.01, 0.02, 0.04, 0.05, 0.06, or 0.08. By using the optical complementary layer 202 with the refractive index difference, the difference of the transmission directions of the external light after reaching the light collecting region 20 through the region corresponding to the electrode layer 201 and the region corresponding to the optical complementary layer 202 can be further reduced, so as to weaken the optical diffraction phenomenon of the light collecting region 20.
In this embodiment, the refractive index of the electrode layer 201 is the same as the refractive index of the optically complementary layer 202. The optical complementary layer 202 with the same refractive index as the electrode layer 201 is arranged in the spacer region, so that the consistency of the transmission direction of light after passing through the display panel can be further ensured, and the diffraction problem of the light can be further improved.
It is understood that, in order to reduce the difference between the degrees of absorption of the external light by the electrode layer 201 and the optically complementary layer 202 and further improve the imaging quality of the photographing device located at the region corresponding to the light collection region 20, the absolute value of the difference between the extinction coefficient of the electrode layer 201 and the extinction coefficient of the optically complementary layer 202 is less than or equal to 0.01. So, the absorptive degree is close with the absorptive degree of external light behind the complementary layer 202 of optics after the absorptive degree of external light behind the electrode layer 201, and the light homogeneity that different correspondence regions passed through is better to avoid the setting of the complementary layer 202 of optics to the harmful effects that the light absorption degree caused.
Further, the absolute value of the difference between the extinction coefficient of the electrode layer 201 and the extinction coefficient of the optically complementary layer 202 is 0.001, 0.002, 0.004, 0.005, 0.006, or 0.008. By adopting the optical complementary layer 202 with the extinction coefficient difference, the consistency of external light after reaching the lighting area 20 can be further improved, and the influence of light diffraction can be weakened. In this embodiment, the extinction coefficient of the electrode layer 201 is the same as that of the optical complementary layer 202.
In other embodiments, the orthographic projection of the optically complementary layer on the substrate may also be located within the orthographic projection of the spacer region on the substrate, i.e. with a gap between the optically complementary layer and the adjacent electrode layer. Further, in the direction parallel to the arrangement direction of the adjacent electrode layers, the distance between the side wall of the optical complementary layer close to the electrode layer and the side wall of the electrode layer close to the optical complementary layer is less than or equal to 0.3 μm. By the arrangement, the manufacturing difficulty of the display panel can be reduced, and the problem of light diffraction is improved.
Furthermore, the distances between the side wall of the optical complementary layer close to the electrode layer and the side wall of the electrode layer close to the optical complementary layer are 0.08 μm, 0.2 μm and 0.24 μm, which is beneficial to further reducing the alignment precision between the optical complementary layer and the electrode layer and further reducing the manufacturing difficulty of the display panel.
It can be understood that, because there is a gap between the electrode layer and the optical complementary layer, the materials of the optical complementary layer and the electrode layer may also be the same, and further, an electrical isolation medium layer may also be disposed in the gap between the electrode layer and the optical complementary layer, so as to enable the electrode layer and the optical complementary layer to be disposed in an insulating manner, thereby avoiding the optical complementary layer from affecting the transmission of electrical signals by the electrode layer.
In the display panel provided by the embodiment, the optical complementary layer 202 and the electrode layer 201 are located on the same surface of the planarization layer 203, so that the problems of light diffraction and the like are solved, the overall thickness of the display panel can be remarkably reduced, and the manufacturing process is simplified.
A third embodiment of the present invention further provides a display panel, which is different from the foregoing embodiments in that the display panel includes a planarization layer, the planarization layer has a hole therein, the hole extends along a direction of the planarization layer toward the substrate, one of the electrode layer or the optically complementary layer is located at the bottom of the hole, and the other one of the electrode layer and the optically complementary layer is located between adjacent holes, and the planarization layer is located on a surface of the substrate away from the planarization layer. Fig. 5 is a schematic cross-sectional view of a display panel according to a third embodiment of the invention. The display panel provided in this embodiment will be described in detail with reference to the accompanying drawings, and it should be noted that the same or corresponding portions as those in the previous embodiment can be referred to the description of the previous embodiment, and are not repeated herein.
Referring to fig. 5, the display panel includes: the optical element comprises a substrate 300, a planarization layer 301, an electrode layer 302 and an optical complementary layer 303, wherein a space area is arranged between adjacent electrode layers 302.
In this embodiment, the planarization layer 301 has holes 304 therein, and the holes 304 are communicated with the space between the adjacent electrode layers 302.
In this embodiment, the optically complimentary layer 303 is located at the bottom of the holes 304, and the electrode layer 302 is located on the planarization layer 301 between adjacent holes 304 away from the surface of the substrate 300. It will be appreciated that the locations of the optically complementary layer and the electrode layer on the planarization layer may be interchanged, i.e. in other embodiments the electrode layer is at the bottom of the wells and the planarization layer between adjacent wells is at a surface of the planarization layer remote from the substrate. In this embodiment, the orthographic projection of the spacer region on the substrate 300 completely coincides with the orthographic projection of the optical complementary layer 303 on the substrate 300, that is, the orthographic projection boundary of the electrode layer 302 on the substrate 300 coincides with the orthographic projection boundary of the optical complementary layer 303 on the substrate 300. In other embodiments, the orthographic projection of the optically complementary layer on the substrate 300 may also be within the orthographic projection of the spacers on said substrate 300.
Specifically, in the same process step, the optical complementary layer 303 is formed in the hole 304 by sputtering, and the electrode layer 302 is formed on the surface of the planarization layer 301 between the adjacent holes 304 at the same time.
In this embodiment, the electrode layer 302 and the optical complementary layer 303 are made of the same material. By adopting the optical complementary layer 303 made of the same material as the electrode layer 302, the deflection degree of the transmission direction of the external light after penetrating through the electrode layer 302 and the optical complementary layer 303 can be ensured to be consistent, so that the consistency of the transmission direction of the light reaching the light collecting region 30 is high, the optical path difference of the light reaching the light collecting region 30 after passing through the region corresponding to the electrode layer 302 and the region corresponding to the spacer region is reduced, and the optical diffraction condition generated by the optical path difference is weakened. In addition, in the manufacturing process, the electrode layer 302 and the optical complementary layer 303 can be formed in the same step process, thereby simplifying the manufacturing process of the display panel.
In other embodiments, the materials of the electrode layer and the optically complementary layer may also be different.
In addition, in the present embodiment, the cross-sectional shape of the hole 304 is a regular trapezoid in a cross-section perpendicular to the surface of the substrate 300 and parallel to the arrangement direction of the adjacent electrode layers 302, that is, the top opening size of the hole 304 is smaller than the bottom opening size of the hole 304, and specifically, in the cross-section perpendicular to the surface of the substrate 300 and parallel to the arrangement direction of the adjacent electrode layers 302, the top width of the hole 304 away from the substrate 300 is smaller than the bottom width close to the substrate 300. Therefore, the manufacturing difficulty of the display panel is further reduced, and unnecessary electrical connection between the optical complementary layer 303 and the electrode layer 302 is avoided. Specifically, since the cross-sectional shape of the hole 304 is a regular trapezoid, when the electrode layer 302 and the optical complementary layer 303 are formed in the same process step, an adhesion film layer is not formed on the sidewall of the hole 304, so that the adhesion film layer is prevented from electrically connecting the optical complementary layer 303 and the electrode layer 302.
It is understood that, in other embodiments, the shape of the hole 304 may also be rectangular or inverted trapezoid or other shapes in a cross section perpendicular to the surface of the substrate 300 and parallel to the arrangement direction of the adjacent electrode layers 302.
In the present embodiment, the holes 304 are through holes, the optical complementary layer 303 is located on the surface of the substrate 300 exposed by the holes 304, and the electrode layer 302 is located on the surface of the planarization layer 301 between the adjacent holes 304 away from the substrate 300.
Referring to fig. 6, in other embodiments, the hole 304 may also be a blind hole, and the optical complementary layer 303 is located on the surface of the planarization layer 301 exposed by the hole 304.
In order to improve the consistency of the deflection degree of the external light transmitted through the electrode layer 302 and the external light transmitted through the optical complementary layer 303, the absolute value of the difference between the refractive indexes of the electrode layer 302 and the optical complementary layer 303 is less than or equal to 0.1.
Further, the absolute value of the difference between the refractive indices of the electrode layer 302 and the optically complementary layer 303 is 0.01, 0.02, 0.04, 0.05, 0.06, or 0.08. By using the optical complementary layer 303 with the refractive index difference, the difference between the transmission directions of the external light reaching the light collecting region 30 through the region corresponding to the electrode layer 302 and the region corresponding to the optical complementary layer 303 can be further reduced, so as to reduce the optical diffraction phenomenon of the light collecting region 30.
In this embodiment, the refractive index of the electrode layer 302 is the same as the refractive index of the optically complementary layer 303. The optical complementary layer 303 with the same refractive index as the electrode layer 302 is arranged in the spacer region, so that the consistency of the transmission direction of light after passing through the display panel can be further ensured, and the diffraction problem of light can be further improved.
It is understood that, in order to reduce the difference between the degrees of absorption of the external light by the electrode layer 302 and the optically complementary layer 303 and further improve the imaging quality of the photographing device located in the region corresponding to the light collection region 30, the absolute value of the difference between the extinction coefficient of the electrode layer 302 and the extinction coefficient of the optically complementary layer 303 is less than or equal to 0.01. Like this, the absorptive degree is close with the absorptive degree of external light behind the complementary layer 303 of optics after the electrode layer 302 back is absorbed to external light, and the light homogeneity that different correspondence regions passed through is better to avoid the setting of the complementary layer 303 of optics to the harmful effects that the light absorption degree caused.
Further, the absolute value of the difference between the extinction coefficient of the electrode layer 302 and the extinction coefficient of the optically complementary layer 303 is 0.001, 0.002, 0.004, 0.005, 0.006, or 0.008. By adopting the optical complementary layer 303 with the extinction coefficient difference, the consistency of external light after reaching the light collecting area 30 can be further improved, and the influence of light diffraction can be weakened.
In this embodiment, the extinction coefficient of the electrode layer 302 is the same as that of the optically complementary layer 303. In the display panel provided by the embodiment, the planarization layer 301 has the hole 304 therein, and has one of the optical complementary layer 303 or the electrode layer 302 at the bottom of the hole 304 close to the substrate 300, and correspondingly has the other of the optical complementary layer 303 or the electrode layer 302 at the surface of the planarization layer 301 adjacent to the hole 304 far from the substrate 300, which facilitates the accurate relative arrangement of the spacers between the optical complementary layer 303 and the adjacent electrode layer 302, and does not need to perform precise alignment when forming the optical complementary layer 303 or the electrode layer 302, thereby facilitating the simplification of the manufacturing process of the display panel.
Correspondingly, a fourth embodiment of the present invention further provides a display device, which includes the display panel in any of the above embodiments.
The display device can be a mobile phone, a tablet or a computer and the like.
Further, the display apparatus further includes a photographing device corresponding to a position of the optically complementary layer. That is, the display device has a photographing apparatus mounted under the area of the display panel having the optically complementary layer, such as a display device such as a mobile phone or a flat panel having an under-screen camera.
Accordingly, the fifth embodiment of the present invention further provides a manufacturing method of a display panel, which can be used to form the display panel. The manufacturing method comprises the following steps: providing a substrate, wherein the substrate comprises a light collecting area, and an external shooting device is arranged below the substrate in the light collecting area; forming a plurality of discrete electrode layers in the lighting area, wherein a spacer area is arranged between every two adjacent electrode layers; a plurality of discrete optical complementary layers are formed, orthographic projections of the optical complementary layers on the substrate are at least partially overlapped with orthographic projections of the spacers on the substrate, and the optical complementary layers are used for improving the consistency of the light transmission directions of outside light after passing through the corresponding areas of the spacers and the corresponding areas of the electrode layers.
Fig. 7 and fig. 8 are schematic cross-sectional views illustrating steps of a method for manufacturing a display panel according to a fifth embodiment of the present invention. The following will describe in detail the method for manufacturing a display panel according to an embodiment of the present invention with reference to the accompanying drawings, and it should be noted that the same or corresponding portions as those in the foregoing embodiment will not be described in detail below.
Referring to fig. 7, a substrate 400 is provided; an optically complementary layer 401 is formed on the substrate 400.
Specifically, several optically complementary layers 401 may be formed on the surface of the substrate 400 through a patterning process, and all the optically complementary layers 401 are located on the same side of the substrate 400. In the present embodiment, the material of the optical complementary layer 401 is the same as the material of the electrode layer 403 to be formed subsequently, and the thickness of the optical complementary layer 401 is the same as the thickness of the electrode layer 403 to be formed subsequently.
In other embodiments, the optically complementary layer and the subsequently formed electrode layer may also be different materials.
Referring to fig. 8, electrode layers 403 are formed with spacers 404 between adjacent electrode layers 403.
In this embodiment, after forming the optical complementary layer 401 and before forming the electrode layer 403, forming a planarization layer 402 on the surface of the substrate 400 having the optical complementary layer 401, wherein the planarization layer 402 covers the optical complementary layer 401.
With continued reference to fig. 8, several discrete electrode layers 403 are formed on the substrate 400 with spacers 404 between adjacent electrode layers 403.
In this embodiment, the electrode layers 403 arranged at equal intervals are formed on the surface of the planarization layer 402 away from the substrate 400 as an example, and in other embodiments, the electrode layers may also be an array of electrode layers arranged at unequal intervals.
The orthographic projection of the optically complementary layer 401 on the substrate 400 at least partially overlaps the orthographic projection of the spacer region 404 on the substrate 400. That is, after several discrete electrode layers 403 are formed, a spacer region 404 between adjacent electrode layers 403 is disposed opposite the optically complementary layer 401.
In the present embodiment, the orthographic projection of the spacer region 404 on the substrate 400 and the orthographic projection of the optically complementary layer 403 on the substrate 400 are completely coincident. That is, the width of the spacer region 404 is equal to the width of the optically complementary layer 401 in the direction parallel to the arrangement of the adjacent electrode layer 403, and the electrode layer 403 is exactly complementary to the optically complementary layer 401 in the orthogonal projection direction perpendicular to the substrate 400.
With such an arrangement, for the external light, the electrode layer 403 and the optical complementary layer 401 are equivalent to a continuous and complete optical medium layer, and the deflection degree of the transmission direction of the external light after passing through the optical medium layer is consistent, so that the consistency of the transmission direction of the light reaching the lighting area 40 is high, and the light diffraction condition of the shooting device at the area corresponding to the lighting area 40 is weakened.
In other embodiments, the spacer region has a width less than the width of the optically complementary layer in a direction parallel to the alignment of the adjacent electrode layers. Further, in a direction parallel to the arrangement direction of the adjacent electrode layers, a distance between a side wall of the optical complementary layer close to the electrode layer and a side wall of the electrode layer close to the optical complementary layer is less than or equal to 0.3 μm. Within the distance range, the problem of light diffraction can be improved while the manufacturing difficulty of the display panel is reduced.
In other embodiments, the width of the spacer region may be larger than the width of the complementary layer in a direction parallel to the arrangement of the adjacent electrode layers. Further, in a direction parallel to the arrangement direction of the adjacent electrode layers, a distance between a side wall of the optical complementary layer close to the electrode layer and a side wall of the electrode layer close to the optical complementary layer is less than or equal to 0.3 μm. Therefore, the overlapping area of the orthographic projection of the electrode layer and the optical complementary layer on the substrate is small, the manufacturing difficulty of the display panel is reduced, and the adverse effect of the overlapping area on the transmission direction of external light is reduced, so that the performance of the display panel is further improved.
Furthermore, the distances between the side wall of the optical complementary layer facing the electrode layer and the side wall of the electrode layer facing the optical complementary layer are 0.08 μm, 0.2 μm and 0.24 μm, which is beneficial to further reducing the alignment precision between the optical complementary layer and the electrode layer and further reducing the manufacturing difficulty of the display panel.
The manufacturing method of the display panel provided by the embodiment can be used for forming the display panel with the anti-diffraction effect in the embodiment; in addition, since the optical complementary layer 401 and the electrode layer 403 are respectively located on two opposite sides of the planarization layer 402, it is beneficial to avoid unnecessary electrical connection between the optical complementary layer 401 and the electrode layer 403, and further improve the performance of the display panel.
In other embodiments, after the planarization layer is formed, the optical complementary layer and the electrode layer may be formed on the side of the planarization layer away from the substrate.
A sixth embodiment of the invention provides a method for manufacturing a display panel, which can be used to form the display panel. Different from the foregoing embodiments, the method for manufacturing a display panel according to this embodiment further includes, before forming the electrode layer and the optical complementary layer: forming a planarization layer on a substrate; the process steps for forming the electrode layer and the optical complementary layer comprise: forming a hole in the planarization layer; and forming an electrode layer and an optical complementary layer, wherein one of the electrode layer and the optical complementary layer is positioned at the bottom of the hole, and the other one of the electrode layer and the optical complementary layer is positioned between the adjacent holes and is close to the surface of the substrate.
Fig. 9 to 11 are schematic cross-sectional structures corresponding to steps of a method for manufacturing a display panel according to a sixth embodiment of the invention.
The following describes the manufacturing method of the display panel provided in the embodiment of the present invention in detail with reference to the accompanying drawings, and it should be noted that the same or corresponding parts as those in the foregoing embodiment will not be described in detail again.
Referring to fig. 9, a substrate 500 is provided and a planarization layer 501 is formed on the substrate 500.
Referring to fig. 10, a hole 502 is formed in a planarization layer 501.
Specifically, the hole 502 is formed in the planarization layer 501 by a mask etching process. In this embodiment, the hole 502 is a through hole, and in other embodiments, the hole may also be a blind hole.
In this embodiment, the cross-sectional shape of the hole 502 is a regular trapezoid in a cross-section perpendicular to the surface of the substrate 500. Thus, after the electrode layers 503 are formed subsequently, the cross-sectional shape of the hole 502 is ensured to be also a regular trapezoid in the direction perpendicular to the surface of the substrate 500 and parallel to the arrangement direction of the adjacent electrode layers 503.
In other embodiments, the Kong Poumian shape may also be other shapes such as rectangular.
Referring to fig. 11, an electrode layer 503 and an optically complementary layer 504 are formed, one of the electrode layer 503 or the optically complementary layer 504 is located at the bottom of the hole 502, and the other is located on the surface of the planarization layer 501 away from the substrate 500 between the adjacent holes 502.
In the present embodiment, an optically complementary layer 504 is formed at the bottom of the hole 502 close to the substrate 500, and an electrode layer 503 is formed on the surface of the planarization layer 501 between the adjacent holes 502 away from the substrate 500. In other embodiments, it is also possible to form an electrode layer at the bottom of the holes and an optically complementary layer at the surface of the planarization layer remote from the substrate between adjacent holes.
In this embodiment, in the same process step, the electrode layer 503 and the optical complementary layer 504 are formed. Film formation is performed on the side of the substrate 500 having the planarization layer 501, for example, by a magnetron sputtering process, and the same film-forming materials are deposited on the bottom of the hole 502 near the substrate 500 and the surface of the planarization layer 501 between adjacent holes 502 far from the substrate 500, respectively, to form the optically complementary layer 504 and the electrode layer 503. In the sputtering process, since the top opening size of the hole 502 is smaller than the bottom opening size, a film cannot be formed on the sidewall of the hole 502, thereby preventing unnecessary electrical connection between adjacent electrode layers 503.
Due to the arrangement of the hole 502, the alignment problem between the electrode layer 503 and the optical complementary layer 504 in the manufacturing process does not need to be considered, which is beneficial to significantly reducing the manufacturing difficulty, reducing the process cost and shortening the process period.
In other embodiments, the electrode layer and the optical complementary layer may also be formed separately in different process steps. For example, a patterned electrode layer is formed on the surface of the planarization layer away from the substrate, and then an optically complementary layer is formed on the bottom of the hole.
The manufacturing method of the display panel provided by the embodiment can be used for forming the display panel with the anti-diffraction effect in the above embodiment, and can avoid the influence of the optical complementary layer 504 on the transmission of the electric signal of the electrode layer 503 while improving the imaging quality of the shooting device in the region corresponding to the light collecting region 50, so that the stability of the display panel is improved, and the alignment step is not needed when the electrode layer 503 and the optical complementary layer 504 are formed, so that the manufacturing process is simplified.
Moreover, by forming the hole 502 in the planarization layer 501 on the substrate 500, and forming the optical complementary layer 504 and the electrode layer 503 on the bottom of the hole 502 close to the substrate 500 and the top of the planarization layer 501 between the adjacent holes 502 far from the substrate 500, the precise alignment step required for oppositely arranging the spacing region between the optical complementary layer 504 and the adjacent electrode layer 503 when forming the electrode layer 503 or the optical complementary layer 504 is reduced, thereby improving the anti-diffraction effect of the display panel and simplifying the manufacturing process of the display panel.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. A display panel, comprising:
the substrate comprises a light collecting area, and external shooting equipment is arranged below the substrate of the light collecting area;
a plurality of discrete electrode layers located in the light collecting area, and a spacing area is arranged between every two adjacent electrode layers;
the device comprises a plurality of discrete optical complementary layers, wherein orthographic projections of the optical complementary layers on the substrate are at least partially overlapped with orthographic projections of the spacers on the substrate, and the optical complementary layers are used for improving the consistency of light transmission directions of outside light after passing through the regions corresponding to the spacers and the regions corresponding to the electrode layers;
the optical complementary layer is made of an insulating material, the optical complementary layer and the electrode layer are arranged on the same layer, and the adjacent optical complementary layer is in contact with the opposite side wall of the electrode layer.
2. The display panel according to claim 1, wherein an absolute value of a difference between a refractive index of the electrode layer and a refractive index of the optically complementary layer is less than or equal to 0.1.
3. The display panel of claim 2, wherein the refractive index of the electrode layer is the same as the refractive index of the optically complementary layer.
4. The display panel according to claim 1, wherein an absolute value of a difference between an extinction coefficient of the electrode layer and an extinction coefficient of the optically complementary layer is less than or equal to 0.01.
5. The display panel according to claim 4, wherein an extinction coefficient of the electrode layer is the same as an extinction coefficient of the optically complementary layer.
6. The display panel of claim 1, wherein an orthographic projection of the spacer region on the substrate is completely coincident with an orthographic projection of the optically complementary layer on the substrate; or, the orthographic projection of the optical complementary layer on the substrate is within the orthographic projection of the spacer region on the substrate; alternatively, the orthographic projection of the spacer region on the substrate is within the orthographic projection of the optically complementary layer on the substrate.
7. A display device, comprising: the display panel and the photographing apparatus of any one of claims 1 to 6, the photographing apparatus being located below the lighting area.
8. A method of manufacturing a display panel, comprising:
providing a substrate, wherein the substrate comprises a light collecting area, and an external shooting device is arranged below the substrate in the light collecting area;
forming a plurality of discrete electrode layers in the lighting area, wherein a spacing area is arranged between every two adjacent electrode layers;
forming a plurality of discrete optical complementary layers, wherein orthographic projections of the optical complementary layers on the substrate are at least partially overlapped with orthographic projections of the spacers on the substrate, and the optical complementary layers are used for improving the consistency of light transmission directions of outside light after passing through the regions corresponding to the spacers and the regions corresponding to the electrode layers;
the optical complementary layer is made of an insulating material, the optical complementary layer and the electrode layer are arranged on the same layer, and the adjacent optical complementary layer is in contact with the opposite side wall of the electrode layer.
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CN106816457A (en) * 2016-12-28 2017-06-09 上海天马微电子有限公司 A kind of touch-control display panel and preparation method thereof, touch control display apparatus
CN107658332A (en) * 2017-10-25 2018-02-02 京东方科技集团股份有限公司 A kind of display panel, display device and preparation method

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