Display panel, preparation method thereof and display device

Abstract

This application discloses a display panel and its fabrication method, as well as a display device, relating to the field of display technology. It improves the light sensitivity of a photosensitive device without reducing the luminous efficiency of the light-emitting device. The display panel includes a substrate, an anode layer, a cathode layer, a light-emitting portion, and a photoelectric conversion portion. The anode layer is disposed on one side of the substrate; the anode layer includes a first electrode and a second electrode. The cathode layer is disposed on the side of the anode layer away from the substrate; the cathode layer includes a third electrode and a fourth electrode, the third electrode being disposed opposite to the first electrode, and the fourth electrode being disposed opposite to the second electrode; along a direction perpendicular to the substrate, the thickness of the third electrode is greater than the thickness of the fourth electrode. The light-emitting portion is disposed between the first electrode and the third electrode. The photoelectric conversion portion is disposed between the second electrode and the fourth electrode. This application is used for image display.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] With the rapid development of display technology, display devices have gradually become ubiquitous in people's lives. Among them, organic light-emitting diodes (OLEDs) are widely used in smart products such as mobile phones, televisions, and laptops due to their advantages such as self-illumination, low power consumption, wide viewing angle, fast response speed, high contrast, and flexible display.

[0003] In related technologies, photosensitive devices are integrated into the display panel, sharing the cathode layer with OLEDs to reduce production costs. Therefore, the current challenge is to increase the light sensitivity of the photosensitive devices in the display device without reducing the luminous efficiency of the light-emitting devices.

[0004] Public content

[0005] This disclosure provides a display panel and its manufacturing method, as well as a display device, which increases the light sensitivity of the photosensitive device without reducing the luminous efficiency of the light-emitting device.

[0006] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0007] On one hand, a display panel is provided. The display panel includes a substrate, an anode layer, a cathode layer, a light-emitting portion, and a photoelectric conversion portion. The anode layer is disposed on one side of the substrate; the anode layer includes a first electrode and a second electrode. The cathode layer is disposed on the side of the anode layer away from the substrate; the cathode layer includes a third electrode and a fourth electrode, the third electrode being disposed opposite to the first electrode, and the fourth electrode being disposed opposite to the second electrode; along a direction perpendicular to the substrate, the thickness of the third electrode is greater than the thickness of the fourth electrode. The light-emitting portion is disposed between the first electrode and the third electrode. The photoelectric conversion portion is disposed between the second electrode and the fourth electrode.

[0008] In some embodiments, along a direction perpendicular to the substrate, the cathode layer includes a first sublayer and a second sublayer, the first sublayer being located on the side of the second sublayer closer to the substrate. Along a direction perpendicular to the substrate, the third electrode includes a stacked first sub-electrode and a second sub-electrode, the first sub-electrode being located in the first sublayer and the second sub-electrode being located in the second sublayer; the fourth electrode is located in the first sublayer.

[0009] In some embodiments, the display panel further includes a first peeling portion disposed on the side of the fourth electrode away from the substrate; the adhesion between the first peeling portion and the second sublayer is less than the adhesion between the first sublayer and the second sublayer.

[0010] In some embodiments, the cathode layer further includes an auxiliary cathode electrically connected to the third electrode, the fourth electrode, and a common voltage terminal. Along a direction perpendicular to the substrate, the thickness of the auxiliary cathode is greater than the thickness of the third electrode.

[0011] In some embodiments, the cathode layer includes a first sublayer, a second sublayer, and a third sublayer, wherein the first sublayer is located on the side of the second sublayer closer to the substrate, and the third sublayer is located on the side of the second sublayer farther from the substrate. Along a direction perpendicular to the substrate, the auxiliary cathode includes a first conductive pattern, a second conductive pattern, and a third conductive pattern stacked thereon, wherein the first conductive pattern is located in the first sublayer, the second conductive pattern is located in the second sublayer, and the third conductive pattern is located in the third sublayer.

[0012] In some embodiments, the display panel further includes a second peeling portion disposed on the side of the third electrode away from the substrate. The adhesion between the second peeling portion and the third sublayer is less than the adhesion between the second sublayer and the third sublayer.

[0013] In some embodiments, the display panel includes a first peel-off portion. The first peel-off portion and a second peel-off portion partially overlap, and in the overlapping portion, the second peel-off portion is located on the side of the first peel-off portion away from the substrate. Alternatively, the first peel-off portion includes a first sub-part and a second sub-part stacked together, the first sub-part being located on the side of the second sub-part closer to the substrate, and the second sub-part and the second peel-off portion being made of the same material and disposed in the same layer.

[0014] In some embodiments, the display panel includes a first peeling portion, wherein the maximum area of ​​the orthographic projection of the first peeling portion on the substrate is smaller than the maximum area of ​​the orthographic projection of the second peeling portion on the substrate.

[0015] In some embodiments, the display panel includes a first peel-off portion. The display panel also includes a pixel defining layer disposed on the side of the anode layer away from the substrate; the pixel defining layer has a pixel opening and a photosensitive opening. The first peel-off portion covers the bottom of the photosensitive opening and extends to the surface of the pixel defining layer away from the substrate. A second peel-off portion covers the bottom of the pixel opening and extends to the surface of the pixel defining layer away from the substrate.

[0016] The portion of the first peeling portion extending to the surface of the pixel defining layer away from the substrate is designated as a first portion, and the portion of the second peeling portion extending to the surface of the pixel defining layer away from the substrate is designated as a second portion. The average distance between the boundary of the first portion and the photosensitive opening is less than the average distance between the boundary of the second portion and the pixel opening.

[0017] In some embodiments, the overlapping portion of the first electrode, the light-emitting part, and the third electrode forms a light-emitting device; the plurality of light-emitting devices includes a plurality of red light-emitting devices, a plurality of blue light-emitting devices, a plurality of first green light-emitting devices, and a plurality of second green light-emitting devices.

[0018] The array of multiple red light-emitting devices and multiple blue light-emitting devices is arranged in multiple rows and columns. Each row includes multiple red light-emitting devices and multiple blue light-emitting devices arranged alternately along a first direction, and each column includes multiple red light-emitting devices and multiple blue light-emitting devices arranged alternately along a second direction.

[0019] The array of the plurality of first green light-emitting devices and the plurality of second green light-emitting devices is arranged in multiple rows and columns. Each row includes a plurality of first green light-emitting devices and a plurality of second green light-emitting devices arranged alternately along a first direction. Each column includes a plurality of first green light-emitting devices and a plurality of second green light-emitting devices arranged alternately along a second direction. The first green light-emitting devices and the second green light-emitting devices are respectively located between two adjacent rows and two columns of red light-emitting devices and blue light-emitting devices.

[0020] In some embodiments, in a first direction, the distance between the light-emitting centers of any adjacent red light-emitting devices and the light-emitting centers of any adjacent blue light-emitting devices is approximately equal; in a second direction, the distance between the light-emitting centers of any adjacent red light-emitting devices and the light-emitting centers of any adjacent blue light-emitting devices is approximately equal.

[0021] In some embodiments, the overlapping portion of the second electrode, the photoelectric conversion unit, and the fourth electrode forms a photosensitive device. The photosensitive device is disposed between an adjacent red light-emitting device and a blue light-emitting device along the first direction. And / or, the photosensitive device is disposed between an adjacent red light-emitting device and a blue light-emitting device along the second direction.

[0022] In some embodiments, the plurality of red and blue light-emitting devices are divided into multiple light-emitting device groups, each light-emitting device group including a red light-emitting device and a blue light-emitting device adjacent to each other in the second direction. The multiple light-emitting device groups include a first subgroup and a second subgroup, which are arranged alternately in the first direction. Specifically, the distance between the light-emitting centers of the red and blue light-emitting devices in the first subgroup is less than the distance between the light-emitting centers of the red and blue light-emitting devices in the second subgroup.

[0023] In some embodiments, the overlapping portion of the second electrode, the photoelectric conversion unit, and the fourth electrode forms a photosensitive device. The photosensitive device is disposed between a red light-emitting device and a blue light-emitting device in the second subgroup, and between two adjacent first subgroups along the second direction. And / or, the photosensitive device is disposed between an adjacent red light-emitting device and a blue light-emitting device along the first direction.

[0024] In some embodiments, a plurality of photosensitive devices are disposed between two rows and two columns of adjacent red light-emitting devices and blue light-emitting devices, and the second electrodes of the plurality of photosensitive devices are electrically connected.

[0025] In some embodiments, the line connecting the light-emitting centers of the red and blue light-emitting devices on opposite sides of the photosensitive device is a first connecting line. The length of the portion of the first connecting line overlapping the photosensitive device is the minimum dimension of the photosensitive device in a predetermined direction, which is substantially parallel to the first connecting line.

[0026] In the display panel provided in this embodiment, the thickness of the third electrode can be designed to be relatively thick, so that the third electrode has semi-transparent and semi-reflective characteristics. This allows a microcavity to be formed between the cathode and anode of the light-emitting device, thereby improving the luminous efficiency of the light-emitting device. Simultaneously, the thickness of the fourth electrode can be designed to be relatively thin, thereby increasing the light transmittance of the fourth electrode. This results in higher light transmittance of the cathode of the photosensitive device, increasing the light sensitivity of the photosensitive device.

[0027] On the other hand, a display device is provided. The display device includes a display panel as described in any of the above embodiments.

[0028] In another aspect, a method for fabricating a display panel is provided. The method includes: forming an anode layer on a substrate; the anode layer including a first electrode and a second electrode; forming a light-emitting portion on the first electrode and a photoelectric conversion portion on the second electrode; forming a cathode layer on the side of the light-emitting portion and the photoelectric conversion portion away from the substrate; the cathode layer including a third electrode and a fourth electrode, the third electrode being disposed opposite to the first electrode, and the second electrode being disposed opposite to the fourth electrode; along a direction perpendicular to the substrate, the thickness of the third electrode is greater than the thickness of the fourth electrode.

[0029] In some embodiments, forming a cathode layer on the side of the light-emitting portion and the photoelectric conversion portion away from the substrate includes: forming a first electrode film; the first electrode film being a first sub-layer of the cathode layer; forming a first release portion; the first release portion being disposed on the side of the fourth electrode away from the substrate; forming a second electrode film; the adhesion between the first release portion and the first electrode film is less than the adhesion between the first electrode film and the second electrode film; peeling off the portion of the second electrode film overlapping with the first release portion; the remaining portion of the second electrode film being a second sub-layer of the cathode layer.

[0030] In some embodiments, the cathode layer further includes an auxiliary cathode. After peeling off the portion where the second electrode film overlaps with the first peeling portion, forming the cathode layer on the side of the light-emitting portion and the photoelectric conversion portion away from the substrate further includes: forming a second peeling portion; the second peeling portion is disposed on the side of the third electrode away from the substrate. A third electrode film is formed; the adhesion between the first peeling portion and the third electrode film, and the adhesion between the second peeling portion and the third electrode film, are both less than the adhesion between the third electrode film and the second electrode film. The portion where the third electrode film overlaps with the second peeling portion and the first peeling portion is peeled off; the remaining portion of the third electrode film is the third sub-layer of the cathode layer.

[0031] The beneficial effects of the display panel manufacturing method and display device provided in this disclosure are the same as those of the display panel provided in the above technical solutions, and will not be repeated here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0033] Figure 1 This is a structural diagram of a display device according to some embodiments;

[0034] Figure 2 A cross-sectional view of a display device according to some embodiments;

[0035] Figure 3 An exploded view of a display device according to some embodiments;

[0036] Figure 4 for Figure 3 A sectional view along the middle AA';

[0037] Figure 5 for Figure 3 Another sectional view along the middle AA';

[0038] Figure 6 for Figure 4 A magnified view of a section at point A in the middle;

[0039] Figure 7 This is a top view of a light-emitting device and a photosensitive device according to some embodiments;

[0040] Figure 8 This is another top view of the light-emitting device and the photosensitive device according to some embodiments;

[0041] Figure 9 This is another top view of the light-emitting device and the photosensitive device according to some embodiments;

[0042] Figure 10 This is yet another top view of a light-emitting device and a photosensitive device according to some embodiments;

[0043] Figure 11 This is yet another top view of a light-emitting device and a photosensitive device according to some embodiments;

[0044] Figure 12 This is yet another top view of a light-emitting device and a photosensitive device according to some embodiments;

[0045] Figure 13 for Figure 9 A cross-sectional view along the middle BB';

[0046] Figure 14 and Figure 15 This is a flowchart of a method for manufacturing a display panel according to some embodiments. Detailed Implementation

[0047] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0048] Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms, such as the third-person singular "comprises" and the present participle "comprising," are interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0049] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0050] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. The term "connected" should be interpreted broadly; for example, a "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium. The term "coupled," for example, indicates that two or more components have direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0051] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

[0052] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0053] As used herein, depending on the context, the term “if” may optionally be interpreted as meaning “when”, “in the event of”, “in response to determination”, or “in response to detection”. Similarly, depending on the context, the phrase “if it is determined that…” or “if [the stated condition or event] is detected” may optionally be interpreted as meaning “in the event of determination that…”, “in response to determination that…”, “when [the stated condition or event] is detected”, or “in response to the detection of [the stated condition or event]”.

[0054] The use of “applies to” or “configured to” in this article implies an open and inclusive language that does not preclude applicability to or configuration to devices that perform additional tasks or steps.

[0055] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0056] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0057] As used herein, “parallel,” “perpendicular,” and “equal” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°; “equal” includes absolute equality and approximate equality, where an acceptable range of deviation for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0058] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0059] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0060] See Figure 1 Some embodiments of this disclosure provide a display device 1000, which can be any device that displays images, whether moving (e.g., video) or fixed (e.g., still images) and whether it is text or images.

[0061] For example, the display device 1000 can be any product or component with display function, such as a television, laptop computer, tablet computer, mobile phone, personal digital assistant (PDA), navigator, wearable device, virtual reality (VR) device, etc.

[0062] In some embodiments, see Figure 1 The display device 1000 includes a display panel 100.

[0063] For example, such as Figure 1 and Figure 2 As shown, the above-mentioned display device 1000 may also include a housing 200, a cover plate 300, a circuit board 400, a photosensitive device 500, and other electronic components.

[0064] like Figure 2 As shown, the longitudinal section of the housing 200 can be, for example, U-shaped. The display panel 100 and the circuit board 400 are disposed inside the housing 200, and the cover plate 300 is disposed at the opening of the housing 200.

[0065] like Figure 2 and Figure 3 As shown, the circuit board 400 can be bound to the end of the display panel 100 and bent to the back side of the display panel 100, which is beneficial for the narrow bezel design of the display device 1000.

[0066] like Figure 1 and Figure 3 As shown, the photosensitive device 500 can be integrated into the display panel 100 to achieve a full-screen design. The photosensitive device 500 includes at least one of an infrared sensor, a proximity sensor, an eye-tracking module, and a face recognition module.

[0067] The aforementioned display panel 100 comes in various types, and can be selected and configured according to actual needs.

[0068] For example, the display panel 100 may be an organic light-emitting diode (OLED) display panel, a quantum dot light-emitting diode (QLED) display panel, etc., and the embodiments disclosed herein are not specifically limited thereto.

[0069] The following description uses the above-mentioned display panel 100 as an OLED display panel as an example to illustrate some embodiments of this disclosure.

[0070] In some embodiments, see Figure 4 The display panel 100 includes a display substrate 10 and an encapsulation layer 20 for encapsulating the display substrate 10.

[0071] Among them, such as Figure 4 As shown, the display substrate 10 has a light-emitting side and a non-light-emitting side disposed opposite to each other, and the encapsulation layer 20 is disposed on the light-emitting side of the display substrate 10, that is... Figure 4 The upper side of the middle.

[0072] It should be noted that the encapsulation layer 20 can be an encapsulation film or an encapsulation substrate. Figure 4The following is an illustration using the encapsulation layer 20 as an example of an encapsulation film.

[0073] In some embodiments, see Figure 4 The display substrate 10 includes a substrate 11, an anode layer 12, a cathode layer 13, a light-emitting part 14, and a photoelectric conversion part 15.

[0074] The substrate 11 mentioned above includes various types, and can be selected and set according to actual needs.

[0075] For example, the substrate 11 can be a rigid substrate. For instance, the rigid substrate can be a glass substrate or a polymethyl methacrylate (PMMA) substrate.

[0076] For example, the substrate 11 can be a flexible substrate. For instance, the flexible substrate can be a polyethylene terephthalate (PET) substrate, a polyethylene naphthalate (PEN) substrate, or a polyimide (PI) substrate, etc.

[0077] like Figure 4 As shown, the anode layer 12 is disposed on one side of the substrate 11 (e.g., Figure 4 (on the upper side of the middle), and the anode layer 12 includes a first electrode 121 and a second electrode 122.

[0078] like Figure 4 As shown, the cathode layer 13 is disposed on the side of the anode layer 12 away from the substrate 11. The cathode layer 13 includes a third electrode 131 and a fourth electrode 132. The third electrode 131 is disposed opposite to the first electrode 121, and the fourth electrode 132 is disposed opposite to the second electrode 122.

[0079] like Figure 4 As shown, the light-emitting part 14 is disposed between the first electrode 121 and the third electrode 131. At this time, the overlapping portion of the first electrode 121, the light-emitting part 14, and the third electrode 131 forms the light-emitting device 30. The first electrode 121 is the anode of the light-emitting device 30, and the third electrode 131 is the cathode of the light-emitting device 30.

[0080] like Figure 4 As shown, the photoelectric conversion unit 15 is disposed between the second electrode 122 and the fourth electrode 132. At this time, the overlapping portion of the second electrode 122, the photoelectric conversion unit 15, and the fourth electrode 132 forms a photosensitive device 500. The second electrode 122 is the anode of the photosensitive device 500, and the fourth electrode 132 is the cathode of the photosensitive device 500.

[0081] Among them, such as Figure 4 As shown, the display substrate 10 further includes a pixel defining layer 16, which is disposed on the side of the anode layer 12 away from the substrate 11.

[0082] like Figure 4 As shown, the pixel defining layer 16 has a pixel opening 161 and a photosensitive opening 162. A light-emitting device 30 is located in a pixel opening 161 and a photosensitive device 500 is located in a photosensitive opening 162.

[0083] Currently, the key challenge is how to increase the light sensitivity of photosensitive devices without reducing their luminous efficiency.

[0084] Based on this, in this embodiment, the thickness of the third electrode 131 is greater than the thickness of the fourth electrode 132 along the direction perpendicular to the substrate 11. That is, the thickness of the cathode of the light-emitting device 30 is greater than the thickness of the cathode of the photosensitive device 500.

[0085] In this configuration, the third electrode 131 can be designed to be thicker, giving it a semi-transparent, semi-reflective characteristic. This allows a microcavity to be formed between the cathode and anode of the light-emitting device 30, thereby improving the luminous efficiency of the light-emitting device 30. Simultaneously, the fourth electrode 132 can be designed to be thinner, increasing its light transmittance. This results in higher light transmittance at the cathode of the photosensitive device 500, increasing the amount of light received by the photosensitive device 500 and improving its photosensitivity.

[0086] For example, see Figure 4 Along a direction perpendicular to the substrate 11, the cathode layer 13 includes a first sublayer 1310 and a second sublayer 1320, with the first sublayer 1310 located on the side of the second sublayer 1320 closer to the substrate 11.

[0087] Based on this, along a direction perpendicular to the substrate 11, the third electrode 131 includes a first sub-electrode 1311 and a second sub-electrode 1312 stacked together, with the first sub-electrode 1311 located in the first sub-layer 1310 and the second sub-electrode 1312 located in the second sub-layer 1320. The fourth electrode 132 is located in the first sub-layer 1310.

[0088] In this case, the first sub-electrode 1311 of the third electrode 131 and the fourth electrode 132 can be made of the same material and prepared in the same process step, thereby reducing production costs.

[0089] The thickness of the first sublayer 1310 can range from 2 nm to 8 nm, for example. For example, the thickness of the first sublayer 1310 is any one of 2 nm, 4 nm, 5 nm, 7 nm and 8 nm.

[0090] The thickness of the second sublayer 1320 can range from 2 nm to 8 nm, for example. For example, the thickness of the second sublayer 1320 is any one of 2 nm, 4 nm, 5 nm, 7 nm and 8 nm.

[0091] In addition, such as Figure 4 As shown, the display panel 100 also includes a first peeling portion 17, which is disposed on the side of the fourth electrode 132 away from the substrate 11, and the adhesion between the first peeling portion 17 and the second sub-layer 1320 is less than the adhesion between the first sub-layer 1310 and the second sub-layer 1320.

[0092] In this case, the first stripping portion 17 can be formed after the formation of the first sublayer 1310 and before the formation of the second sublayer 1320. In this way, the process of forming the second sublayer 1320 does not require the use of a fine mask, and the overlapping portion of the second sublayer 1320 and the first stripping portion 17 can be directly stripped, so that the side of the fourth electrode 132 away from the substrate 11 does not have the second sublayer 1320, thereby reducing the process difficulty of forming the third electrode 131 and the fourth electrode 132.

[0093] The thickness of the first stripping portion 17 can range from 1 nm to 10 nm, for example. For example, the thickness of the first stripping portion 17 is any one of 1 nm, 2 nm, 4 nm, 5 nm, 7 nm, 8 nm and 10 nm.

[0094] It should be noted that the material of the first stripping portion 17 includes a light-transmitting material, and the transmittance of the light-transmitting material can be, for example, greater than or equal to 80%. Exemplarily, the material of the first stripping portion 17 includes at least one of lithium 8-hydroxyquinoline, N,N-biphenyl-N,N-bis(9-phenyl-9H-carbazole-3-yl)diphenyl-4,4'-diamine, N(biphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazole-3-yl)phenyl)-9H-fluorene-2-amine, and 2-(4-(9,10-bis(naphthyl-2-yl)anthracene-2-yl)phenyl)-1-phenyl-1H-benzo[D]imidazolium.

[0095] It should be understood that the photosensitive device 500 should completely cover the area where the photosensitive opening 162 is located, so that the photosensitive device 500 can sense external ambient light in the area where the photosensitive opening 162 is located, thereby increasing the photosensitive area of ​​the photosensitive device 500.

[0096] Based on this, refer to Figure 4The first peeling portion 17 covers the bottom of the photosensitive opening 162 and extends to the surface of the pixel defining layer 16 away from the substrate 11, so as to avoid the first peeling portion 17 not being able to completely cover the bottom of the photosensitive opening 162 due to process deviations. In this way, the first peeling portion 17 can completely cover the bottom of the photosensitive opening 162, preventing the second sub-layer 1320 from being partially retained at the bottom of the pixel opening 161, so that the light transmittance of the cathode layer 13 of the photosensitive device 500 is high in the entire area where the photosensitive opening 162 is located, thereby increasing the light sensitivity of the photosensitive device 500 and improving the light sensitivity of the photosensitive device 500.

[0097] In some embodiments, see Figure 4 The cathode layer 13 also includes an auxiliary cathode 133, which is electrically connected to the third electrode 131, the fourth electrode 132 and the common voltage terminal.

[0098] It should be noted that the auxiliary cathode 133, the third electrode 131, and the fourth electrode 132 form a continuous, integral layer structure.

[0099] Along the direction perpendicular to the substrate 11, the thickness of the auxiliary cathode 133 is greater than the thickness of the third electrode 131. That is, the thickness of the auxiliary cathode 133 is greater than the thickness of the cathode of the light-emitting device 30, and greater than the thickness of the cathode of the photosensitive device 500.

[0100] With this configuration, the auxiliary cathode 133 can be designed to be thicker, thereby reducing its resistance. This results in a lower voltage drop across the power supply signal transmitted from the common voltage terminal through the auxiliary cathode 133 to the third electrode 131 and the fourth electrode 132, improving brightness uniformity and reducing energy consumption.

[0101] For example, see Figure 4 The cathode layer 13 also includes a third sublayer 1330, which is located on the side of the second sublayer 1320 away from the substrate 11.

[0102] Based on this, along the direction perpendicular to the substrate 11, the auxiliary cathode 133 includes a first conductive pattern 1331, a second conductive pattern 1332 and a third conductive pattern 1333 stacked together. The first conductive pattern 1331 is located in the first sublayer 1310, the second conductive pattern 1332 is located in the second sublayer 1320, and the third conductive pattern 1333 is located in the third sublayer 1330.

[0103] In this case, the first conductive pattern 1331 of the auxiliary cathode 133 and the first sub-electrode 1311 and the fourth electrode 132 of the third electrode 131 can be made of the same material and prepared in the same process step; the second conductive pattern 1332 of the auxiliary cathode 133 and the second sub-electrode 1312 of the third electrode 131 can be made of the same material and prepared in the same process step, thereby reducing production costs.

[0104] The thickness of the third sublayer 1330 can range from 1 nm to 10 nm, for example. For example, the thickness of the third sublayer 1330 is any one of 1 nm, 2 nm, 4 nm, 5 nm, 7 nm, 8 nm and 10 nm.

[0105] In addition, such as Figure 4 As shown, the display panel 100 also includes a second peeling portion 18, which is disposed on the side of the third electrode 131 away from the substrate 11, and the adhesion between the second peeling portion 18 and the third sub-layer 1330 is less than the adhesion between the second sub-layer 1320 and the third sub-layer 1330.

[0106] In this case, the second stripping portion 18 can be formed after the second sublayer 1320 is formed and before the third sublayer 1330 is formed. In this way, the process of forming the third sublayer 1330 does not require the use of a fine mask, and the overlapping portion of the third sublayer 1330 with the first stripping portion 17 and the second stripping portion 18 can be directly stripped, so that the third sublayer 1330 is not present on the side of the third electrode 131 and the fourth electrode 132 away from the substrate 11, thereby reducing the process difficulty of forming the third electrode 131, the fourth electrode 132 and the auxiliary cathode 133.

[0107] The thickness of the second stripping portion 18 can range from 1 nm to 10 nm, for example. For example, the thickness of the second stripping portion 18 is any one of 1 nm, 2 nm, 4 nm, 5 nm, 7 nm, 8 nm and 10 nm.

[0108] It should be noted that the material of the second stripping section 18 includes a light-transmitting material, and the transmittance of the light-transmitting material can be, for example, greater than or equal to 80%. Exemplarily, the material of the second stripping section 18 includes at least one of lithium 8-hydroxyquinoline, N,N-biphenyl-N,N-bis(9-phenyl-9H-carbazole-3-yl)diphenyl-4,4'-diamine, N(biphenyl-4-yl)9,9-dimethyl-N-(4(9-phenyl-9H-carbazole-3-yl)phenyl)-9H-fluorene-2-amine, and 2-(4-(9,10-bis(naphthyl-2-yl)anthracite-2-yl)phenyl)-1-phenyl-1H-benzo[D]imidazolium.

[0109] It should be understood that the light-emitting device 30 should completely cover the area where the pixel opening 161 is located, so that the light-emitting device 30 can emit light in the area where the pixel opening 161 is located, thereby improving the luminous efficiency.

[0110] Based on this, refer to Figure 4 The second stripping portion 18 covers the bottom of the pixel opening 161 and extends to the surface of the pixel defining layer 16 away from the substrate 11, to avoid the second stripping portion 18 failing to completely cover the bottom of the pixel opening 161 due to process variations. In this way, the second stripping portion 18 can completely cover the bottom of the pixel opening 161, preventing the third sub-layer 1330 from being partially retained at the bottom of the pixel opening 161. This allows the cathode layer 13 of the light-emitting device 30 to have semi-transparent and semi-reflective characteristics in the entire area where the pixel opening 161 is located, thereby improving the luminous efficiency of the light-emitting device 30.

[0111] In addition, see Figure 4 The portion of the first peeling portion 17 extending to the surface of the pixel defining layer 16 away from the substrate 11 is the first portion, and the portion of the second peeling portion 18 extending to the surface of the pixel defining layer 16 away from the substrate 11 is the second portion. The average distance between the boundary of the first portion and the photosensitive opening 162 is smaller than the average distance between the boundary of the second portion and the pixel opening 161.

[0112] With this configuration, the average distance between the boundary of the second part and the pixel opening 161 can be designed to be greater, so as to avoid the second stripping part 18 failing to completely cover the sidewall of the pixel opening 161 due to process deviations. In this way, the second stripping part 18 can safely cover the sidewall of the pixel opening 161, thereby preventing the third sub-layer 1330 from remaining on the sidewall of the pixel opening 161, making the cathode layer 13 on the sidewall of the pixel opening 161 thinner, which is beneficial for the design of the large viewing angle light output of the display device 1000.

[0113] Meanwhile, the average distance between the boundary of the first part and the photosensitive opening 162 can be designed to be closer, so as to reduce the area of ​​the fourth electrode 132, increase the proportion of the auxiliary cathode 133 in the cathode layer 13, thereby reducing the voltage drop, improving brightness uniformity, and reducing energy consumption.

[0114] For example, such as Figure 4 As shown, the average distance between the boundary of the first part and the photosensitive opening 162 is greater than or equal to 2μm, and the average distance between the boundary of the second part and the pixel opening 161 is less than 2μm.

[0115] In some embodiments, see Figure 7 The maximum area of ​​the first peeling part 17 projected onto the substrate 11 is smaller than the maximum area of ​​the second peeling part 18 projected onto the substrate 11.

[0116] For example, see Figure 7 The light-emitting device 30 includes multiple red light-emitting devices 310, multiple blue light-emitting devices 320, multiple first green light-emitting devices 330 and multiple second green light-emitting devices 340.

[0117] Among them, the light-emitting area of ​​the blue light-emitting device 320 is larger than that of the red light-emitting device 310; the light-emitting area of ​​the red light-emitting device 310 is larger than that of the first green light-emitting device 330; and the light-emitting area of ​​the first green light-emitting device 330 is approximately equal to that of the second green light-emitting device 340.

[0118] At this time, the area of ​​the orthogonal projection of the second peeling portion 18 on the side of the third electrode 131 of the blue light-emitting device 320 away from the substrate 11 is the maximum area of ​​the orthogonal projection of the second peeling portion 18 on the substrate 11. That is, the area of ​​the orthogonal projection of the first peeling portion 17 on the substrate 11 is smaller than the area of ​​the orthogonal projection of the second peeling portion 18 on the side of the third electrode 131 of the blue light-emitting device 320 away from the substrate 11.

[0119] In some embodiments, such as Figure 4 and Figure 6 As shown, the first peeling portion 17 and the second peeling portion 18 partially overlap, and in the overlapping portion, the second peeling portion 18 is located on the side of the first peeling portion 17 away from the substrate 11.

[0120] At this point, the first peeling portion 17 and the second peeling portion 18 are formed in different process steps, as detailed below.

[0121] In other embodiments, such as Figure 5 As shown, the first stripping portion 17 includes a first sub-portion 171 and a second sub-portion 172 stacked together. The first sub-portion 171 is located on the side of the second sub-portion 172 close to the substrate 11, and the second sub-portion 172 is made of the same material as the second stripping portion 18 and is disposed in the same layer.

[0122] At this time, the second sub-part 172 of the first peeling part 17 can be made of the same material as the second peeling part 18 and prepared in the same process step, thereby reducing production costs, as detailed below. Meanwhile, the thicker thickness of the first peeling part 17 facilitates the peeling of the third sub-layer 1330 from the first peeling part 17.

[0123] In some embodiments, see Figure 4 The aforementioned display panel 100 may further include a functional layer, which includes a light-emitting functional unit and a photoelectric functional unit. The light-emitting functional unit is disposed between the first electrode 121 and the third electrode 161, and the photoelectric functional unit is disposed between the second electrode 122 and the fourth electrode 162.

[0124] The functional layer may include at least one of the following: an electron transport layer (ETL), an electron injection layer (EIL), a hole transport layer (HTL), and a hole injection layer (HIL).

[0125] For example, along a direction perpendicular to and away from the substrate 11, the functional layer sequentially includes a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer, with the light-emitting part 14 and the photoelectric conversion part 15 located between the hole transport layer and the electron transport layer.

[0126] As can be seen from the above, the light-emitting functional part of the light-emitting device 30 and the photoelectric functional part of the photosensitive device 500 can use the same material and be prepared in the same process step, thereby reducing production costs.

[0127] It is understandable that the arrangement of the above-mentioned light-emitting devices 30 is not unique.

[0128] In some embodiments, see Figure 7 The multiple light-emitting devices 30 include multiple red light-emitting devices 310, multiple blue light-emitting devices 320, multiple first green light-emitting devices 330 and multiple second green light-emitting devices 340.

[0129] like Figure 7 As shown, multiple red light-emitting devices 310 and multiple blue light-emitting devices 320 are arranged in multiple rows and columns. Each row includes multiple red light-emitting devices 310 and multiple blue light-emitting devices 320 arranged alternately along the first direction X, and each column includes multiple red light-emitting devices 310 and multiple blue light-emitting devices 320 arranged alternately along the second direction Y.

[0130] like Figure 7 As shown, a plurality of first green light-emitting devices 330 and a plurality of second green light-emitting devices 340 are arranged in multiple rows and columns. Each row includes a plurality of first green light-emitting devices 330 and a plurality of second green light-emitting devices 340 arranged alternately along the first direction X. Each column includes a plurality of first green light-emitting devices 330 and a plurality of second green light-emitting devices 340 arranged alternately along the second direction Y. The first green light-emitting devices 330 and the second green light-emitting devices 340 are respectively located between two adjacent rows and two columns of red light-emitting devices 310 and blue light-emitting devices 320.

[0131] Arranging the display panels in this way can effectively improve the display effect, enhance the display detail, and reduce the jagged edges and graininess of the display.

[0132] In some examples, see Figure 7 In the first direction X, the distance between the light-emitting centers of any adjacent red light-emitting device 310 and the light-emitting centers of any adjacent blue light-emitting device 320 is approximately equal. In the second direction Y, the distance between the light-emitting centers of any adjacent red light-emitting device 310 and the light-emitting centers of any adjacent blue light-emitting device 320 is approximately equal.

[0133] like Figure 7 As shown, the photosensitive device 500 can be disposed between an adjacent red light-emitting device 310 and a blue light-emitting device 320 along the first direction X.

[0134] like Figure 8 As shown, the photosensitive device 500 can be disposed between an adjacent red light-emitting device 310 and a blue light-emitting device 320 along the second direction Y.

[0135] like Figure 9 As shown, the photosensitive device 500 can be disposed between a red light-emitting device 310 and a blue light-emitting device 320 adjacent to each other along the first direction X, and between a red light-emitting device 310 and a blue light-emitting device 320 adjacent to each other along the second direction Y.

[0136] At this time, refer to Figure 9 and Figure 13 Multiple photosensitive devices 500 are arranged between two rows and two columns of adjacent red light-emitting devices 310 and blue light-emitting devices 320. The second electrodes 122 of these multiple photosensitive devices 500 can be electrically connected. In this way, the multiple photosensitive devices 500 can function as a single photosensitive unit, increasing the amount of signal sensed by the photosensitive circuit 50 mentioned below and improving photosensitivity.

[0137] Among them, see Figure 4 The display panel 100 also includes a pixel driving circuit 40 and a photosensitive circuit 50, both of which include thin-film transistors 60. The thin-film transistor 60 includes a semiconductor channel 61, a source 62, a drain 63, and a gate 64, with the source 62 and drain 63 respectively in contact with the semiconductor channel 61.

[0138] It should be noted that the source 62 and drain 63 mentioned above can be interchanged, that is... Figure 4 The 62 in the figure represents the drain electrode. Figure 4 The 63 in the figure represents the source pole.

[0139] like Figure 4As shown, the anode (first electrode 121) of the light-emitting device 30 is electrically connected to the source 62 or drain 63 of a thin-film transistor 60 in the pixel driving circuit 40. The anode (second electrode 122) of the photosensitive device 500 is electrically connected to the source 62 or drain 63 of a thin-film transistor 60 in the pixel driving circuit 40. Figure 4 The diagram illustrates the following example: the first electrode 121 is electrically connected to the drain 63 of a thin-film transistor 60 in the pixel driving circuit 40, and the second electrode 122 is electrically connected to the drain 63 of a thin-film transistor 60 in the photosensitive circuit 50.

[0140] The second electrodes 122 of the plurality of photosensitive devices 500 are electrically connected, meaning that the second electrodes 122 of the plurality of photosensitive devices 500 are electrically connected to the same photosensitive circuit 50. For example, the second electrodes 122 of the plurality of photosensitive devices 500 are electrically connected to the source 62 of a thin-film transistor 60 of the photosensitive circuit 50.

[0141] In other examples, see Figure 10 Multiple red light emitters 310 and multiple blue light emitters 320 are divided into multiple light emitter groups 350, and each light emitter group 350 includes a red light emitter 310 and a blue light emitter 320 that are adjacent in the second direction Y.

[0142] The plurality of light-emitting device groups 350 include a first subgroup 351 and a second subgroup 352, which are arranged alternately in a first direction X. Furthermore, the distance between the light-emitting center of the red light-emitting device 310 and the light-emitting center of the blue light-emitting device 320 in the first subgroup 351 is smaller than the distance between the light-emitting centers of the red light-emitting device 310 and the blue light-emitting device 320 in the second subgroup 352.

[0143] like Figure 10 As shown, the photosensitive device 500 is disposed between a red light-emitting device 310 and a blue light-emitting device 320 adjacent to each other along the first direction X.

[0144] like Figure 11 As shown, the photosensitive device 500 is disposed between a red light-emitting device 310 and a blue light-emitting device 320 in the second subgroup 352, and between two adjacent first subgroups 351 along the second direction Y.

[0145] like Figure 12 As shown, the photosensitive device 500 is disposed between a red light-emitting device 310 and a blue light-emitting device 320 adjacent to each other along the first direction X, between a red light-emitting device 310 and a blue light-emitting device 320 in the second subgroup 352, and between two first subgroups 351 adjacent to each other along the second direction Y.

[0146] At this time, refer to Figure 12 and Figure 13 Multiple photosensitive devices 500 are arranged between two rows and two columns of adjacent red light-emitting devices 310 and blue light-emitting devices 320. Based on this, the second electrodes 122 of the multiple photosensitive devices 500 can be electrically connected.

[0147] The second electrodes 122 of the multiple photosensitive devices 500 are electrically connected, meaning that the second electrodes 122 of the multiple photosensitive devices 500 are electrically connected to the same photosensitive circuit 50. For example, the second electrodes 122 of the multiple photosensitive devices 500 are electrically connected to the source 62 of a thin-film transistor 60 of the photosensitive circuit 50.

[0148] In some embodiments, see Figure 7 The minimum distance between the boundary of the photosensitive device 500 and the boundary of the red light-emitting device 310 and the minimum distance between the boundary of the blue light-emitting device 320 are approximately equal, so as to facilitate the preparation of the fine mask required in the process of forming the photosensitive device 500.

[0149] In some embodiments, such as Figure 7 and Figure 8 As shown, the line connecting the light-emitting centers of the red light-emitting device 310 and the blue light-emitting device 320 on opposite sides of the photosensitive device 500 is the first connecting line L1.

[0150] The length of the portion where the first connecting line L1 overlaps with the photosensitive device 500 is the minimum dimension of the photosensitive device 500 in a set direction, which is approximately parallel to the first connecting line L1. This configuration increases the photosensitive area of ​​the photosensitive device 500, thereby increasing the amount of light it can perceive and improving its photosensitivity.

[0151] For example, such as Figure 8 As shown, the orthographic projection of the photosensitive device 500 on the substrate 11 is a pillow shape that is narrow in the middle and wide on both sides, with the center line of the pillow located on the first connecting line L1.

[0152] For example, such as Figure 7 As shown, the orthographic projection of the photosensitive device 500 on the substrate 11 is a four-pointed star, and one of the two shortest diagonals of the four-pointed star is located on the first connecting line L1.

[0153] It should be noted that the orthographic projection of the photosensitive device 500 on the substrate 11 can also be other shapes, and this embodiment does not specifically limit them.

[0154] Some embodiments of this disclosure also provide a method for manufacturing a display panel, see below. Figure 14 This includes S100 to S300.

[0155] S100: An anode layer 12 is formed on the substrate 11.

[0156] In the above steps, an anode thin film can first be formed using sputtering or vapor deposition processes; then, a photoresist pattern is formed on the upper surface of the stacked structure 110 through coating, exposure, and development processes, and based on the photoresist pattern, the anode thin film is etched to form the anode layer 12. Finally, the photoresist pattern is stripped off.

[0157] Among them, such as Figure 4 As shown, the anode layer 12 includes a first electrode 121 and a second electrode 122. The structures of the first electrode 121 and the second electrode 122 can be referred to above, and will not be repeated here in the embodiments of this disclosure.

[0158] S200: A light-emitting part 14 is formed on the first electrode 121 and a photoelectric conversion part 15 is formed on the second electrode 122.

[0159] In the above steps, a vapor deposition process can be used, and a fine photomask can be used to form the light-emitting part 14 and the photoelectric conversion part 15, respectively. For example, Figure 4 As shown, the structures of the light-emitting part 14 and the photoelectric conversion part 15 can be referred to above, and will not be described again here in the embodiments disclosed herein.

[0160] S300: A cathode layer 13 is formed on the side of the light-emitting part 14 and the photoelectric conversion part 15 away from the substrate 11.

[0161] In the above steps, such as Figure 4 As shown, the cathode layer 13 includes a third electrode 131 and a fourth electrode 132. The third electrode 131 is disposed opposite to the first electrode 121, and the second electrode 122 is disposed opposite to the fourth electrode 132. Along the direction perpendicular to the substrate 11, the thickness of the third electrode 131 is greater than the thickness of the fourth electrode 132.

[0162] In some embodiments, see Figure 15 S 300 includes S310 to S340.

[0163] S310: Form the first electrode thin film.

[0164] In the above steps, the first electrode film can be formed by sputtering or vapor deposition. The first electrode film is the first sublayer 1310 of the cathode layer 13 mentioned above.

[0165] S320: Form the first stripping section 17.

[0166] In the above steps, a vapor deposition process can be used, and a fine mask can be used to form the first release portion 17. The first release portion 17 is disposed on the side of the fourth electrode 132 away from the substrate 11.

[0167] S330: Forming the second electrode thin film.

[0168] In the above steps, sputtering or vapor deposition processes can be used to form the second electrode film. The adhesion between the first release portion 17 and the first electrode film is less than the adhesion between the first electrode film and the second electrode film, so that the overlapping portion of the second electrode film and the first release portion 17 can be peeled off in S340.

[0169] S340: Peel off the portion of the second electrode film that overlaps with the first peeling section 17.

[0170] In the above steps, the portion of the second electrode film retained is the second sublayer 1320 of the cathode layer 13.

[0171] In some embodiments, see Figure 4 The cathode layer 13 also includes an auxiliary cathode 133, the thickness of which is greater than the thickness of the third electrode 131. At this time, after S340, as... Figure 15 As shown, S300 also includes S350 to S370.

[0172] S350: Form the second stripping section 18.

[0173] In the above steps, a vapor deposition process can be used, and a fine mask can be used to form the second release portion 18. The second release portion 18 is disposed on the side of the third electrode 131 away from the substrate 11.

[0174] S360: Forming the third electrode thin film.

[0175] In the above steps, the third electrode film can be formed by sputtering or vapor deposition. The adhesion between the first peeling portion 17 and the third electrode film, and the adhesion between the second peeling portion and the third electrode film, are both less than the adhesion between the third electrode film and the second electrode film, so that the overlapping portion of the third electrode film with the second peeling portion 18 and the first peeling portion 17 can be peeled off in S370.

[0176] S370: Peel off the portion of the third electrode film that overlaps with the second peeling portion 18 and the first peeling portion 17.

[0177] In the above steps, the portion of the third electrode film retained is the third sublayer 1330 of the cathode layer 13.

[0178] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, include: Substrate; An anode layer is disposed on one side of the substrate; the anode layer includes a first electrode and a second electrode; A cathode layer is disposed on the side of the anode layer away from the substrate; the cathode layer includes a third electrode and a fourth electrode, the third electrode being disposed opposite to the first electrode and the fourth electrode being disposed opposite to the second electrode; along a direction perpendicular to the substrate, the thickness of the third electrode is greater than the thickness of the fourth electrode; A light-emitting part is disposed between the first electrode and the third electrode; A photoelectric conversion unit is disposed between the second electrode and the fourth electrode; The cathode layer further includes an auxiliary cathode, which is electrically connected to the third electrode, the fourth electrode, and a common voltage terminal; the thickness of the auxiliary cathode is greater than the thickness of the third electrode in a direction perpendicular to the substrate. The cathode layer includes a first sublayer, a second sublayer, and a third sublayer, wherein the first sublayer is located on the side of the second sublayer closer to the substrate, and the third sublayer is located on the side of the second sublayer away from the substrate; Along a direction perpendicular to the substrate, the auxiliary cathode includes a first conductive pattern, a second conductive pattern, and a third conductive pattern stacked together, wherein the first conductive pattern is located in the first sub-layer, the second conductive pattern is located in the second sub-layer, and the third conductive pattern is located in the third sub-layer; The display panel also includes: A first peeling portion is disposed on the side of the fourth electrode away from the substrate; the adhesion between the first peeling portion and the second sublayer is less than the adhesion between the first sublayer and the second sublayer. The second peeling portion is disposed on the side of the third electrode away from the substrate; the adhesion between the second peeling portion and the third sublayer is less than the adhesion between the second sublayer and the third sublayer. A pixel defining layer is disposed on the side of the anode layer away from the substrate; the pixel defining layer has pixel openings and photosensitive openings; The first peeling portion covers the bottom of the photosensitive opening and extends to the surface of the pixel defining layer away from the substrate; the second peeling portion covers the bottom of the pixel opening and extends to the surface of the pixel defining layer away from the substrate. Wherein, the portion of the first peeling portion extending to the surface of the pixel defining layer away from the substrate is the first portion, and the portion of the second peeling portion extending to the surface of the pixel defining layer away from the substrate is the second portion; the average distance between the boundary of the first portion and the photosensitive opening is less than the average distance between the boundary of the second portion and the pixel opening.

2. The display panel according to claim 1, characterized in that, Along a direction perpendicular to the substrate, the cathode layer includes a first sublayer and a second sublayer, wherein the first sublayer is located on the side of the second sublayer closer to the substrate; Along a direction perpendicular to the substrate, the third electrode includes a first sub-electrode and a second sub-electrode stacked together, the first sub-electrode being located in the first sub-layer and the second sub-electrode being located in the second sub-layer; the fourth electrode is located in the first sub-layer.

3. The display panel according to claim 1, characterized in that, The display panel includes a first peel-off portion; The first peeling portion and the second peeling portion partially overlap, and in the overlapping portion, the second peeling portion is located on the side of the first peeling portion away from the substrate; Alternatively, the first stripping portion includes a first sub-portion and a second sub-portion stacked together, the first sub-portion being located on the side of the second sub-portion closer to the substrate, and the second sub-portion being made of the same material as the second stripping portion and disposed in the same layer.

4. The display panel according to claim 1, characterized in that, The display panel includes a first peeling portion, the maximum area of ​​the first peeling portion projected onto the substrate being smaller than the maximum area of ​​the second peeling portion projected onto the substrate.

5. The display panel according to claim 1, characterized in that, The overlapping portion of the first electrode, the light-emitting part, and the third electrode forms a light-emitting device; the plurality of light-emitting devices includes a plurality of red light-emitting devices, a plurality of blue light-emitting devices, a plurality of first green light-emitting devices, and a plurality of second green light-emitting devices; The array of multiple red light-emitting devices and multiple blue light-emitting devices is arranged in multiple rows and multiple columns. Each row includes multiple red light-emitting devices and multiple blue light-emitting devices arranged alternately along a first direction, and each column includes multiple red light-emitting devices and multiple blue light-emitting devices arranged alternately along a second direction. The array of the plurality of first green light-emitting devices and the plurality of second green light-emitting devices is arranged in multiple rows and columns. Each row includes a plurality of first green light-emitting devices and a plurality of second green light-emitting devices arranged alternately along a first direction. Each column includes a plurality of first green light-emitting devices and a plurality of second green light-emitting devices arranged alternately along a second direction. The first green light-emitting devices and the second green light-emitting devices are respectively located between two adjacent rows and two columns of red light-emitting devices and blue light-emitting devices.

6. The display panel according to claim 5, characterized in that, In the first direction, the distance between the light-emitting centers of any adjacent red light-emitting devices and the light-emitting centers of any adjacent blue light-emitting devices is approximately equal; in the second direction, the distance between the light-emitting centers of any adjacent red light-emitting devices and the light-emitting centers of any adjacent blue light-emitting devices is approximately equal.

7. The display panel according to claim 6, characterized in that, The overlapping portion of the second electrode, the photoelectric conversion unit, and the fourth electrode forms a photosensitive device; The photosensitive device is disposed between an adjacent red light-emitting device and a blue light-emitting device along the first direction; and / or, the photosensitive device is disposed between an adjacent red light-emitting device and a blue light-emitting device along the second direction.

8. The display panel according to claim 5, characterized in that, The plurality of red light-emitting devices and the plurality of blue light-emitting devices are divided into a plurality of light-emitting device groups, wherein each light-emitting device group includes a red light-emitting device and a blue light-emitting device that are adjacent in the second direction; The plurality of light-emitting device groups include a first subgroup and a second subgroup, which are arranged alternately in the first direction; wherein the distance between the light-emitting center of the red light-emitting device and the light-emitting center of the blue light-emitting device in the first subgroup is smaller than the distance between the light-emitting center of the red light-emitting device and the light-emitting center of the blue light-emitting device in the second subgroup.

9. The display panel according to claim 8, characterized in that, The overlapping portion of the second electrode, the photoelectric conversion unit, and the fourth electrode forms a photosensitive device; The photosensitive device is disposed between a red light-emitting device and a blue light-emitting device in the second subgroup, and between two adjacent first subgroups along the second direction; and / or, the photosensitive device is disposed between a red light-emitting device and a blue light-emitting device along the first direction.

10. The display panel according to claim 7 or 9, characterized in that, Multiple photosensitive devices are arranged between two rows and two columns of adjacent red and blue light-emitting devices, and the second electrodes of the multiple photosensitive devices are electrically connected.

11. The display panel according to claim 7 or 9, characterized in that, The line connecting the light-emitting centers of the red and blue light-emitting devices on opposite sides of the photosensitive device is the first connecting line. The length of the portion where the first connecting line overlaps with the photosensitive device is the minimum dimension of the photosensitive device in a predetermined direction, which is approximately parallel to the first connecting line.

12. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 11.

13. A method for manufacturing a display panel, characterized in that, The method for preparing a display panel as described in any one of claims 1 to 11 includes: An anode layer is formed on a substrate; the anode layer includes a first electrode and a second electrode; A light-emitting portion is formed on the first electrode and a photoelectric conversion portion is formed on the second electrode; A cathode layer is formed on the side of the light-emitting part and the photoelectric conversion part away from the substrate; the cathode layer includes a third electrode and a fourth electrode, the third electrode is disposed opposite to the first electrode, and the second electrode is disposed opposite to the fourth electrode; along the direction perpendicular to the substrate, the thickness of the third electrode is greater than the thickness of the fourth electrode; The formation of a cathode layer on the side of the light-emitting portion and the photoelectric conversion portion away from the substrate includes: A first electrode thin film is formed; the first electrode thin film is the first sub-layer of the cathode layer; A first stripping portion is formed; the first stripping portion is disposed on the side of the fourth electrode away from the substrate; A second electrode film is formed; the adhesion between the first peeling portion and the first electrode film is less than the adhesion between the first electrode film and the second electrode film. The portion of the second electrode film overlapping with the first peeling portion is peeled off; the portion of the second electrode film retained is the second sub-layer of the cathode layer. The cathode layer further includes an auxiliary cathode. After the portion of the second electrode film overlapping with the first peeling portion is peeled off, the formation of the cathode layer on the side of the light-emitting portion and the photoelectric conversion portion away from the substrate further includes: A second peeling portion is formed; the second peeling portion is disposed on the side of the third electrode away from the substrate; A third electrode film is formed; the adhesion between the first peeling portion and the third electrode film, and the adhesion between the second peeling portion and the third electrode film, are both less than the adhesion between the third electrode film and the second electrode film. Peel off the portion of the third electrode film that overlaps with the second and first peeling portions; the portion of the third electrode film that remains is the third sub-layer of the cathode layer.

Images