Display panel, preparation method of display panel and display device

Abstract

The invention discloses a display panel, a preparation method of the display panel and a display device, and the display panel is characterized in that the display panel comprises a display area, the display area comprises a main screen area and an auxiliary screen area, the light transmittance of the auxiliary screen area is larger than that of the main screen area, and the display panel comprises a substrate which is at least arranged in the display area; the pixel definition layer is arranged on one side of the substrate and provided with a first pixel opening located in the auxiliary screen area, and the pixel definition layer comprises a transparent material; at least part of the first light-emitting element is arranged in the first pixel opening, the first light-emitting element comprises a first electrode, a light-emitting layer and a second electrode which are sequentially arranged in a stacked mode in the direction away from the substrate, at least part of the first electrode is arranged in the first pixel opening, and the first electrode comprises a non-transparent material; the optical adjusting part is arranged on the periphery of the first electrode and connected with the first electrode, and the light transmittance of the optical adjusting part gradually changes from the side close to the first electrode to the side away from the first electrode. The design can improve the diffraction phenomenon of the secondary screen area.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a method for preparing a display panel, and a display device. Background Art

[0002] In order to achieve a perfect full screen, under-screen camera technology can avoid the need to reserve a camera position on the display panel, thereby obtaining a higher screen-to-body ratio, making the display panel more complete and the visual effect better.

[0003] However, for a display panel with an under-screen camera function, obvious diffraction will occur when external light enters the under-screen camera area, thereby interfering with the imaging effect of taking photos / videos. Summary of the invention

[0004] The present application provides a display panel, a method for manufacturing a display panel, and a display device, which can improve the diffraction phenomenon in a secondary screen area.

[0005] The present application provides a display panel, which includes a display area, wherein the display area includes a main screen area, and the transmittance of the auxiliary screen area is greater than that of the main screen area. The display panel includes: a substrate, which is at least arranged in the display area; a pixel definition layer, which is arranged on one side of the substrate and has a first pixel opening located in the auxiliary screen area, and the pixel definition layer includes a transparent material; a first light-emitting element, which is at least partially arranged in the first pixel opening, includes a first electrode, a light-emitting layer and a second electrode which are sequentially stacked in a direction away from the substrate, and the first electrode is at least partially arranged in the first pixel opening, and the first electrode includes a transparent material; an optical adjustment part, which is arranged on the periphery of the first electrode and connected to the first electrode, wherein the transmittance of the optical adjustment part gradually changes from a side close to the first electrode to a side away from the first electrode.

[0006] In one embodiment, the transmittance of the optical adjustment portion gradually changes from a first transmittance on a side close to the first electrode to a second transmittance on a side away from the first electrode, the absolute value of the difference between the first transmittance and the transmittance of the first electrode is less than a first threshold, and the absolute value of the difference between the second transmittance and the transmittance of the pixel definition layer is less than the first threshold.

[0007] In one embodiment, the first threshold is less than or equal to 10%.

[0008] In one embodiment, the thickness of the optical adjustment part increases in a direction approaching the first electrode.

[0009] Preferably, in a direction approaching the first electrode, the thickness of the optical adjustment part increases uniformly.

[0010] In one embodiment, the optical adjustment portion is in a stepped shape, and a transmittance difference between adjacent steps of the optical adjustment portion is less than or equal to the first threshold.

[0011] In one embodiment, a material of the optical adjustment part is the same as a material of at least a portion of the first electrode.

[0012] Preferably, the material of the first electrode includes at least one of indium tin oxide and silver.

[0013] Preferably, the first electrode comprises a first sublayer, a second sublayer and a third sublayer which are sequentially stacked in a direction away from the substrate, the first sublayer comprises indium tin oxide, the second sublayer comprises silver, and the third sublayer comprises indium tin oxide.

[0014] Preferably, the material of the optical adjustment part includes silver.

[0015] Preferably, the optical adjustment part and the first electrode are integrally formed.

[0016] In one embodiment, the optical adjustment unit is made of a material different from that of the first electrode.

[0017] Preferably, the light transmittances of an end of the optical adjustment portion adjacent to the first electrode and an end of the first electrode close to the optical adjustment portion are equal.

[0018] In one embodiment, in a direction close to the first electrode, a change value of the light transmittance of the optical adjustment part per unit length is between a second threshold and a third threshold.

[0019] Preferably, in a direction close to the first electrode, a change value of the light transmittance of the optical adjustment part per micrometer is between 4% and 30%.

[0020] In one embodiment, the optical adjustment portion is in a ring-shaped structure and is disposed around the first electrode.

[0021] Preferably, the display panel further includes a first wiring located in the secondary screen area, the first wiring is located between the substrate and the first electrode, and is electrically connected to the first electrode, and the first wiring is made of a transparent material.

[0022] In one embodiment, the optical adjustment portion is located outside the first pixel opening.

[0023] Preferably, the first electrode is an anode, and the second electrode is a cathode.

[0024] Preferably, the material of the pixel definition layer includes a light-transmitting material.

[0025] Preferably, the material of the pixel definition layer includes photoresist.

[0026] The present application also provides a method for preparing a display panel, the method being used to prepare the display panel described in any one of the above-mentioned embodiments, the method comprising: preparing the first electrode and the optical adjustment part in the same layer on one side of the substrate, wherein the optical adjustment part is located at the periphery of the first electrode and connected to the first electrode, and the transmittance of the optical adjustment part gradually changes from the side close to the first electrode to the side away from the first electrode; preparing the pixel definition layer on one side of the first electrode, and removing part of the pixel definition layer in the sub-screen area to obtain the first pixel opening, wherein the first electrode is at least partially disposed in the first pixel opening; and sequentially preparing the light-emitting layer and the second electrode on the side of the first electrode away from the substrate.

[0027] In one embodiment, the thickness of the optical adjustment part increases in a direction approaching the first electrode, and the step of preparing the first electrode and the optical adjustment part in the same layer on one side of the substrate includes: at least the optical adjustment part is prepared by multiple layers of patterned film formation, wherein the distance between the outer boundary of each next film formation and the first electrode is reduced compared to the distance between the outer boundary of the previous film formation and the first electrode.

[0028] Preferably, the material of the optical adjustment part is the same as at least part of the material of the first electrode, and the step of preparing the first electrode and the optical adjustment part in the same layer on one side of the substrate includes: the optical adjustment part and at least part of the film layer in the first electrode are prepared by multiple stacked patterned same-layer film formation, wherein the distance between the outer boundary of the optical adjustment part each next film formation and the first electrode is reduced compared to the distance between the outer boundary of the optical adjustment part in the previous film formation and the first electrode.

[0029] The present application also provides a display device, comprising a display panel as described in any of the above embodiments, wherein an optical sensor is provided in the auxiliary screen area and located on the side of the substrate away from the first light-emitting element, and the optical sensor is used to receive external light transmitted from the auxiliary screen area.

[0030] Different from the prior art, the beneficial effect of the present application is: the present application sets an optical adjustment part on the periphery of the first electrode, and in the direction away from the first electrode, the transmittance of the optical adjustment part gradually changes from the side close to the first electrode to the side away from the first electrode, thereby destroying the grating structure that causes diffraction, and also destroying the conditions for diffraction to occur, thereby improving the diffraction phenomenon in the secondary screen area. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0032] Figure 1 is a schematic diagram of an implementation of the display panel area division of the present application;

[0033] Figure 2 It is a schematic structural diagram of an implementation mode of the display panel in the secondary screen area of ​​the present application;

[0034] Figure 3 It is a schematic structural diagram of another implementation mode of the display panel in the secondary screen area of ​​the present application;

[0035] Figure 4 yes Figure 2 A schematic diagram of a top view of a first electrode and an optical adjustment unit in one embodiment;

[0036] Figure 5 is a schematic flow chart of an embodiment of a method for manufacturing a display panel of the present application;

[0037] Figure 6 It is a schematic structural diagram of an embodiment of the display device of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] It should be noted that the terms "first" and "second" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0040] See also Figure 1 and Figure 2 The present application provides a display panel, the display panel 10 includes a display area AA, the display area AA includes a main screen area AA1 and a sub-screen area AA2, the sub-screen area AA2 has a transmittance greater than the main screen area AA1, the display panel 10 includes a substrate 110, a pixel definition layer 120, a first light-emitting element 130 and an optical adjustment unit 140. The substrate 110 is at least arranged in the display area AA; the pixel definition layer 120 is arranged on one side of the substrate 110, and is provided with a first pixel opening H located in the secondary screen area AA2, and the pixel definition layer 120 includes a transparent material; the first light-emitting element 130 is at least partially arranged in the first pixel opening H, including a first electrode 131, a light-emitting layer 132 and a second electrode 133 stacked in sequence in a direction away from the substrate 110, the first electrode 131 is at least partially arranged in the first pixel opening H, and the first electrode 131 includes an opaque material; the optical adjustment part 140 is arranged on the periphery of the first electrode 131 and is connected to the first electrode 131, wherein the transmittance of the optical adjustment part 140 gradually changes from a side close to the first electrode 131 to a side away from the first electrode 131.

[0041] Specifically, the secondary screen area AA2 and the main screen area AA1 are both used for display, and the secondary screen area AA2 also serves as a light transmission path for the optical sensor under the screen. Generally speaking, in order to provide a better camera effect, there are certain differences between the film layer of the secondary screen area AA2 and the film layer of the main screen area AA1. For example, the material selected for the film layer of the secondary screen area AA2 is a transparent material, and the pixel density or size of the secondary screen area AA2 is smaller than that of the secondary screen area AA2, so that the light transmittance of the secondary screen area AA2 can be greater than that of the main screen area AA1, thereby improving the light transmittance of the secondary screen area AA2. The pixel definition layer 120 in the secondary screen area AA2 is provided with a first pixel opening H, and the first light-emitting element 130 includes a first electrode 131, a light-emitting layer 132, and a second electrode 133 that are sequentially stacked in a direction away from the substrate 110. The light-emitting layer 132 is used to emit light, and the first electrode 131 and the second electrode 133 provide different potentials for the light-emitting layer 132. The first electrode 131 may be entirely disposed in the first pixel opening H, or may be partially disposed in the first pixel opening H and partially embedded in the pixel definition layer 120 .

[0042] Furthermore, the inventors have found through research that the existing display panel has a diffraction phenomenon when the optical sensor under the screen in the secondary screen area is imaging. The main reason is that when the external light passes through the display panel, it will encounter the opaque first electrode. The first electrode array is arranged to form a grating structure, so that the external light enters such a grating structure, which causes the optical sensor under the screen to diffract light when imaging, resulting in a decrease in the imaging quality of the optical sensor, which is manifested as a blurred picture and loss of details. After further research by the inventors, it was found that the first electrode in the secondary screen area is an opaque material, and the pixel definition layer is a transparent material to form a grating structure. To solve this problem, it is necessary to destroy the grating structure to achieve the problem of improving diffraction. The first electrode is an opaque material, which plays a role in blocking light for the optical sensor. If the first electrode is also changed to a transparent material (that is, there is no grating structure), although the diffraction problem can be solved, the light of the light-emitting element will be directly projected to the optical sensor without the shielding of the first electrode, which will also cause the imaging quality of the optical sensor to decrease.

[0043] In order to solve the above-mentioned problem, the present application further provides an optical adjustment unit 140, which is provided at the periphery of the first electrode 131. Since the transmittance between the first electrode 131 and the pixel definition layer 120 is very different, the transmittance between the first electrode 131 and the pixel definition layer 120 is adjusted by the optical adjustment unit 140. Specifically, the transmittance of the optical adjustment unit 140 gradually changes from the side close to the first electrode 131 to the side away from the first electrode 131, thereby destroying the grating structure that causes diffraction, and also destroying the conditions for diffraction to occur, thereby improving the diffraction phenomenon of the secondary screen area AA2.

[0044] Of course, the structure of this application can not only solve the diffraction problem of the under-screen camera area mentioned in the background technology, but also solve the diffraction problem of the under-screen fingerprint area. Both the under-screen camera area and the under-screen fingerprint area need to receive light from the outside world, and this application reduces the diffraction phenomenon, which is conducive to improving the clarity of the collected image.

[0045] In one application scenario, the secondary screen area AA2 is the under-screen camera area.

[0046] In one application scenario, the secondary screen area AA2 is the under-screen fingerprint area.

[0047] In one application scenario, the secondary screen area AA2 is the under-screen camera area and the under-screen fingerprint area.

[0048] In one embodiment, the transmittance of the optical adjustment unit 140 gradually changes from a first transmittance on a side close to the first electrode 131 to a second transmittance on a side away from the first electrode 131, and the absolute value of the difference between the first transmittance and the transmittance of the first electrode 131 is less than a first threshold, and the absolute value of the difference between the second transmittance and the transmittance of the pixel definition layer 120 is less than the first threshold.

[0049] Specifically, the transmittance of the optical adjustment unit 140 on the side close to the first electrode 131 is a first transmittance, and the first transmittance is close to the transmittance of the first electrode 131, that is, when the absolute value of the difference between the first transmittance and the transmittance of the first electrode 131 is less than the first threshold, the transmittance transition of the first electrode 131 adjacent to the optical adjustment unit 140 can be made smoother. Similarly, the transmittance of the optical adjustment unit 140 on the side away from the first electrode 131 is a second transmittance, and the second transmittance is close to the transmittance of the pixel definition layer 120. That is, when the absolute value of the difference between the second transmittance and the transmittance of the pixel definition layer 120 is less than the first threshold value, the transmittance transition at the position adjacent to the first electrode 131 and the pixel definition layer 120 can be made smoother. In this way, in the direction away from the first electrode 131, the transmittance transitions between the contact surface between the first electrode 131 and the optical adjustment part 140, the entire optical adjustment part 140, and the contact surface between the optical adjustment part 140 and the pixel definition layer 120 are smoother, thereby further optimizing the diffraction phenomenon of the secondary screen area AA2 of the display panel 10.

[0050] In one embodiment, the first threshold is less than or equal to 10%.

[0051] Specifically, the first threshold can be 5%, 8% or 10%, etc. The absolute value of the difference between the first transmittance and the transmittance of the first electrode is less than the first threshold, and the absolute value of the difference between the second transmittance and the transmittance of the pixel definition layer is less than the first threshold, which can avoid the occurrence of diffraction.

[0052] In one embodiment, see Figure 2 , the thickness of the optical adjustment part 140 increases in a direction approaching the first electrode 131 .

[0053] Specifically, the greater the thickness of the optical adjustment part 140, the lower its transmittance, so the thickness can be increased in the direction close to the first electrode 131 and reduced in the direction away from the first electrode 131 to achieve a gradual change in transmittance. The thickness increase can be linear or nonlinear.

[0054] In one embodiment, see Figure 2 , the thickness of the optical adjustment part 140 increases uniformly in a direction approaching the first electrode 131 .

[0055] Specifically, the thickness of the optical adjustment part 140 increases uniformly. Figure 2 In the embodiment, the cross section of the inclined surface of the optical adjustment part 140 is in a straight line shape, and the straight line inclined surface makes the light transmittance at different positions of the optical adjustment part 140 change consistently, that is, ensures that the diffraction improvement of the optical adjustment part 140 is uniform everywhere.

[0056] Of course, in some other embodiments, the thickness of the optical adjustment part may remain unchanged. For example, the optical adjustment part is an organic material, and the transmittance of the optical adjustment part in the direction away from the first electrode can be changed by doping light-absorbing particles with different concentrations along the direction away from the first electrode.

[0057] In one embodiment, see Figure 3 , the optical adjustment part 140 is in a stepped shape, and the transmittance difference between adjacent steps of the optical adjustment part 140 is less than or equal to the first threshold.

[0058] Specifically, the stepped optical adjustment part 140 is thinned in thickness by stepwise steps in the direction away from the first electrode 131, and the thickness thinning of adjacent steps at different positions can be the same or different, as long as the transmittance difference between adjacent steps is less than or equal to the first threshold, it can be ensured that no diffraction occurs. In the process of preparing the stepped optical adjustment part 140, the stepped optical adjustment part 140 can be formed by layer-by-layer deposition, the area of ​​the next layer is smaller than the area of ​​the previous layer, and multiple depositions are performed to form a stepped structure.

[0059] In one embodiment, the material of the optical adjustment part 140 is at least partially the same as the material of the first electrode 131. The optical adjustment part 140 can be made of the same material as part or all of the first electrode 131, which can reduce material costs. The first electrode 131 includes at least one of indium tin oxide or silver.

[0060] For example, optionally, the first electrode 131 includes a first sublayer, a second sublayer and a third sublayer stacked in sequence in a direction away from the substrate 110, the first sublayer material includes indium tin oxide, the second sublayer includes silver, and the third sublayer includes indium tin oxide. Optionally, the material of the optical adjustment unit 140 includes silver.

[0061] In one embodiment, the optical adjustment unit 140 and the first electrode 131 are integrally formed. That is, the optical adjustment unit 140 and the first electrode 131 can be manufactured by the same manufacturing process, which can reduce the manufacturing cost.

[0062] In one embodiment, the optical adjustment unit 140 is made of a material different from that of the first electrode 131 .

[0063] Specifically, different from the above-mentioned embodiment, the material of the optical adjustment part 140 may be different from that of the first electrode 131. The optical adjustment part 140 may be prepared separately from the first electrode 131. Then, the choice of material will not be limited to the material of the first electrode 131. Therefore, the setting of the optical adjustment part 140 is more flexible.

[0064] In an application scenario, the material of the first electrode 131 includes at least one of indium tin oxide or silver, and the material of the optical adjustment unit 140 includes at least one of magnesium or aluminum.

[0065] Of course, in some other implementations, other materials may be selected for the first electrode and the optical adjustment part, and this application does not impose any specific limitation.

[0066] In one embodiment, the light transmittances of an end of the optical adjustment unit 140 adjacent to the first electrode 131 and an end of the first electrode 131 close to the optical adjustment unit 140 are equal.

[0067] Specifically, the transmittances of the optical adjustment unit 140 and the first electrode 131 at the connection position are equal, that is, there is no difference in the transmittance of the transition from the first electrode 131 to the optical adjustment unit 140 , which can enhance the improvement effect on diffraction.

[0068] In one embodiment, see Figure 2 , in the direction close to the first electrode 131 , the change value of the transmittance of the optical adjustment part 140 per unit length is between the second threshold value and the third threshold value.

[0069] Specifically, this embodiment limits the range of the change value of the transmittance of the optical adjustment part 140 per unit length. The reason is that the change value of the transmittance per unit length cannot be too large, which will reduce the improvement effect of diffraction. The change value of the transmittance per unit length cannot be too small, which is limited by the distance between two adjacent first electrodes 131 in the display panel. If it is too small, it will cause the adjacent optical adjustment parts 140 to overlap, which will eventually affect the improvement of diffraction.

[0070] In one embodiment, the change value of the transmittance per micron of the optical adjustment unit 140 is between 4% and 30% in the direction close to the first electrode 131. Specifically, the change value of the transmittance per micron can be 4%, 10%, 20% or 30%, etc., and this application does not make specific limitations.

[0071] In one embodiment, see Figure 4 The optical adjustment part 140 has a ring structure and is arranged around the first electrode 131 .

[0072] Specifically, the optical adjustment part 140 is provided in the area surrounding the first electrode 131, and the transmittance of the optical adjustment part 140 gradually changes at each position on the edge of the first electrode 131 away from the first electrode 131, so that the diffraction in all directions around the first electrode 131 can be improved.

[0073] Of course, in some other implementations, the optical adjustment portion may be divided into a plurality of parts, and the plurality of parts are spaced apart and surround the outer side of the first electrode.

[0074] In one embodiment, see Figure 2 The display panel 10 further includes a first wiring (not shown) located in the auxiliary screen area AA2, the first wiring is located between the substrate 100 and the first electrode 131, the first wiring is electrically connected to the first electrode 131, and the first wiring is made of a transparent material. In this way, the first wiring will not form a grating structure in the auxiliary screen area AA2, thereby preventing the derivative phenomenon from occurring.

[0075] In one embodiment, the optical adjustment unit 140 is located outside the first pixel opening H. That is, the optical adjustment unit 140 is completely embedded in the pixel definition layer 120, so that the optical adjustment unit 140 can be prevented from being affected by the difference in transmittance between the first pixel opening H and the pixel definition layer 120. At the same time, the first electrode 131 is partially embedded in the pixel definition layer 120, which can ensure that the light-emitting layer 132 can be completely prepared on the surface of the first electrode 131.

[0076] In one embodiment, the first electrode 131 is an anode, and the second electrode 133 is a cathode.

[0077] In one embodiment, the material of the pixel definition layer 120 includes a light-transmitting material, that is, the pixel definition layer 120 and the optical adjustment unit 140 provide a light-transmitting effect for the auxiliary screen area AA2 .

[0078] In one embodiment, the material of the pixel definition layer includes photoresist. The material of the pixel definition layer can be at least one of transparent materials such as polyimide, acrylic resin, polyurethane resin, polyethersulfone resin, etc.

[0079] See also Figure 2 and Figure 5 The present application also provides a method for preparing a display panel 10, which is used to prepare the display panel 10 in the above embodiment, and the method includes:

[0080] S100: Prepare a first electrode 131 and an optical adjustment part 140 in the same layer on one side of the substrate 100, wherein the optical adjustment part 140 is located at the periphery of the first electrode 131 and connected to the first electrode 131, and the transmittance of the optical adjustment part 140 gradually changes from a side close to the first electrode 131 to a side away from the first electrode 131.

[0081] Specifically, the present application prepares the optical adjustment unit 140 and the first electrode 131 in the same layer, prepares the optical adjustment unit 140 on the periphery of the first electrode 131 and connects the first electrode 131, and improves the diffraction phenomenon caused by the sudden change of transmittance by a gradual change of transmittance. The principle can be referred to in the above content. The method of preparing the first electrode 131 and the optical adjustment unit 140 can be prepared by a PVD (physical vapor deposition) method.

[0082] S200 : preparing a pixel definition layer 120 on one side of the first electrode 131 , and removing part of the pixel definition layer 120 in the auxiliary screen area AA2 to obtain a first pixel opening H, wherein the first electrode 131 is at least partially disposed in the first pixel opening H.

[0083] Specifically, the pixel definition layer 120 is used to prepare one side of the first electrode 131 and also needs to cover the area other than the first electrode 131. The pixel definition layer 120 can be regarded as a whole-surface film layer. Then, on this basis, at least part of the pixel definition layer 120 on the surface of the first electrode 131 is removed through an etching process to obtain a first pixel opening H.

[0084] S300 : On the side of the first electrode 131 facing away from the substrate 110 , a light-emitting layer 132 and a second electrode 133 are sequentially formed.

[0085] Specifically, by film formation such as evaporation process, the light-emitting layer 132 and the second electrode 133 are sequentially prepared on the side of the first electrode 131 away from the substrate 110 to form the first light-emitting element 130 .

[0086] See also Figure 2 or Figure 3 In one embodiment, the thickness of the optical adjustment unit 140 increases in a direction close to the first electrode 131 , and the step S100 includes:

[0087] At least the optical adjustment unit 140 is prepared by multiple layers of patterned film formation, wherein the distance between the outer edge of each subsequent film formation and the first electrode is reduced compared to the distance between the outer edge of the previous film formation and the first electrode.

[0088] Specifically, it can be understood that the optical adjustment part 140 is divided into a plurality of stacked optical adjustment sub-layers, and then a plurality of optical adjustment sub-layers are prepared by patterning processes, and the area of ​​the optical adjustment sub-layer prepared each time is reduced, and it is in the form of the outer boundary shrinking inward, and the inner boundary is connected to the first electrode 131, and the position remains unchanged, so the thickness of the optical adjustment part 140 finally prepared increases in the direction close to the first electrode 131. The thickness of the optical adjustment sub-layer is between 20 angstroms and 200 angstroms, for example, the thickness of the optical adjustment sub-layer can be 20 angstroms, 50 angstroms, 100 angstroms or 200 angstroms.

[0089] In one embodiment, the material of the optical adjustment unit 140 is the same as at least part of the material of the first electrode 131 , and the step S100 includes:

[0090] At least part of the film layers in the optical adjustment unit 140 and the first electrode 131 are prepared by multiple layers of patterned same-layer film formation, wherein the distance between the outer boundary of each next film formation of the optical adjustment unit 140 and the first electrode 131 is reduced compared to the distance between the outer boundary of the previous film formation of the optical adjustment unit 140 and the first electrode 131.

[0091] Specifically, the optical adjustment part 140 is made of the same material as part of the first electrode 131 and can be prepared at the same time, which simplifies the preparation process and reduces the preparation cost. For example, the material of the optical adjustment part 140 can be silver.

[0092] See also Figure 6 The present application also provides a display device 20, which includes a display panel 10 as described above, and an optical sensor 200 is provided in the auxiliary screen area AA2 and located on the side of the substrate 110 away from the first light-emitting element 130, and the optical sensor 200 is used to receive external light transmitted from the auxiliary screen area AA2.

[0093] Specifically, the display device 20 can be any electronic device such as a notebook, a desktop, a tablet computer, a mobile phone, a smart watch, a virtual display terminal, etc., and the optical sensor 200 can be a camera, etc., which is not limited here.

[0094] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: The display panel includes a display area, the display area includes a main screen area and a sub-screen area, the sub-screen area has a greater light transmittance than the main screen area, and the display panel includes: A substrate, at least arranged in the display area; A pixel definition layer, arranged on one side of the substrate, having a first pixel opening located in the secondary screen area, and comprising a transparent material; A first light-emitting element, at least partially disposed in the first pixel opening, comprising a first electrode, a light-emitting layer, and a second electrode stacked in sequence in a direction away from the substrate, wherein the first electrode is at least partially disposed in the first pixel opening, and the first electrode comprises an opaque material; The optical adjustment part is arranged at the periphery of the first electrode and connected to the first electrode, wherein the light transmittance of the optical adjustment part gradually changes from a side close to the first electrode to a side far from the first electrode.

2. The display panel according to claim 1, characterized in that: The transmittance of the optical adjustment portion gradually changes from a first transmittance on a side close to the first electrode to a second transmittance on a side far from the first electrode, the absolute value of the difference between the first transmittance and the transmittance of the first electrode is less than a first threshold, and the absolute value of the difference between the second transmittance and the transmittance of the pixel definition layer is less than the first threshold; Preferably, the first threshold is less than or equal to 10%.

3. The display panel according to claim 2, characterized in that: The thickness of the optical adjustment part increases in a direction close to the first electrode; Preferably, in a direction close to the first electrode, the thickness of the optical adjustment part increases uniformly; Preferably, the optical adjustment portion is in a stepped shape, and a transmittance difference between adjacent steps of the optical adjustment portion is less than or equal to the first threshold.

4. The display panel according to claim 3, characterized in that: The material of the optical adjustment part is the same as at least part of the material of the first electrode; Preferably, the material of the first electrode includes at least one of indium tin oxide and silver; Preferably, the first electrode comprises a first sublayer, a second sublayer and a third sublayer which are sequentially stacked in a direction away from the substrate, the first sublayer comprises indium tin oxide, the second sublayer comprises silver, and the third sublayer comprises indium tin oxide; Preferably, the material of the optical adjustment part includes silver; Preferably, the optical adjustment part and the first electrode are integrally formed.

5. The display panel according to claim 3, characterized in that: The material of the optical adjustment part is different from that of the first electrode; Preferably, the light transmittances of an end of the optical adjustment portion adjacent to the first electrode and an end of the first electrode close to the optical adjustment portion are equal.

6. The display panel according to claim 1, characterized in that: In a direction close to the first electrode, a change value of the light transmittance of the optical adjustment part per unit length is between a second threshold value and a third threshold value; Preferably, in a direction close to the first electrode, a change value of the light transmittance of the optical adjustment part per micrometer is between 4% and 30%.

7. The display panel according to claim 1, characterized in that: The optical adjustment part is in a ring structure and is arranged around the first electrode; Preferably, the display panel further comprises a first wiring located in the secondary screen area, the first wiring is located between the substrate and the first electrode, and is electrically connected to the first electrode, and the first wiring is made of a transparent material; preferably, the optical adjustment unit is located outside the first pixel opening; Preferably, the first electrode is an anode and the second electrode is a cathode; Preferably, the material of the pixel definition layer includes a light-transmitting material; Preferably, the material of the pixel definition layer includes photoresist.

8. A method for preparing a display panel, characterized in that: The method is used to prepare a display panel according to any one of claims 1 to 7, and the method comprises: The first electrode and the optical adjustment part are prepared in the same layer on one side of the substrate, wherein the optical adjustment part is located at the periphery of the first electrode and connected to the first electrode, and the light transmittance of the optical adjustment part gradually changes from a side close to the first electrode to a side far from the first electrode; The pixel definition layer is prepared on one side of the first electrode, and a portion of the pixel definition layer is removed in the secondary screen area to obtain the first pixel opening, wherein the first electrode is at least partially disposed in the first pixel opening; The light-emitting layer and the second electrode are sequentially prepared on a side of the first electrode facing away from the substrate.

9. The method according to claim 8, characterized in that The thickness of the optical adjustment part increases in a direction close to the first electrode, and the step of preparing the first electrode and the optical adjustment part in the same layer on one side of the substrate comprises: At least the optical adjustment portion is prepared by multiple layers of patterned film formation, wherein the distance between the outer boundary of each subsequent film formation and the first electrode is reduced compared to the distance between the outer boundary of the previous film formation and the first electrode; Preferably, the material of the optical adjustment part is the same as at least part of the material of the first electrode, and the step of preparing the first electrode and the optical adjustment part in the same layer on one side of the substrate includes: The optical adjustment part and at least part of the film layers in the first electrode are prepared by multiple layers of patterned same-layer film formation, wherein the distance between the outer boundary of each next film formation of the optical adjustment part and the first electrode is reduced compared to the distance between the outer boundary of the previous film formation of the optical adjustment part and the first electrode.

10. A display device, characterized in that: The display panel comprises a display panel as claimed in any one of claims 1 to 7, wherein an optical sensor is provided in the auxiliary screen area and located on a side of the substrate away from the first light-emitting element, and the optical sensor is used to receive external light transmitted from the auxiliary screen area.

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