Display panel, display device and preparation method of display panel

Abstract

The invention relates to a display panel, a display device and a preparation method of the display panel. The display panel comprises a substrate, a plurality of light-emitting units and a first light shielding layer, the light-emitting units and the first light shielding layer are arranged on one side of the substrate, the light-emitting units are arranged at intervals, the first light shielding layer comprises a main body part, and the main body part is arranged between at least part of two adjacent light-emitting units. The distance between the surface, deviating from the substrate, of the main body part and the substrate in the thickness direction of the substrate is a first distance, the distance between the surface, deviating from the substrate, of the light-emitting unit and the substrate in the thickness direction of the substrate is a second distance, and the first distance is smaller than the second distance. Therefore, according to the display panel, the display device and the preparation method of the display panel, the display brightness of the display panel and the display device can be improved.

Description

Technical Field

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

[0002] Micro LED displays integrate LED chips with a size of less than 100 microns on a substrate as display pixels. Micro LEDs have the advantages of high stability, long life, low power consumption, and fast response speed.

[0003] In the related art, a display panel may include an array substrate and a plurality of Micro LEDs on the array substrate, wherein the plurality of Micro LEDs are electrically connected to the array substrate. A light shielding layer is disposed between each two adjacent Micro LEDs, and the light shielding layer may help achieve an integrated black effect.

[0004] However, the display brightness of the above display panel is low. Summary of the invention

[0005] Based on this, it is necessary to provide a display panel, a display device and a method for preparing a display panel, aiming to improve the display brightness of the display panel and the display device.

[0006] In a first aspect, an embodiment of the present application provides a display panel, comprising a substrate, a plurality of light-emitting units and a first shading layer, wherein the plurality of light-emitting units and the first shading layer are all arranged on one side of the substrate, and the plurality of light-emitting units are arranged at intervals, wherein the first shading layer comprises a main body portion, the main body portion is arranged between at least part of two adjacent light-emitting units, a distance between a surface of the main body portion facing away from the substrate and the substrate along a thickness direction of the substrate is a first distance, a distance between a surface of the light-emitting unit facing away from the substrate and the substrate along a thickness direction of the substrate is a second distance, and the first distance is smaller than the second distance.

[0007] In the display panel provided by the embodiment of the present application, the distance between the surface of the main body of the first shading layer facing away from the substrate and the substrate along the thickness direction of the substrate is a first distance, and the distance between the surface of the light-emitting unit facing away from the substrate and the substrate along the thickness direction of the substrate is a second distance. By having the first distance be smaller than the second distance, the main body is lower than the light-emitting unit, thereby reducing the probability of the uncured main body contacting the surface of the light-emitting unit facing away from the substrate, thereby alleviating the phenomenon of the main body climbing to the surface of the light-emitting unit facing away from the substrate, thereby reducing the blocking of the light output of the light-emitting unit by the first shading layer, thereby increasing the brightness of the display panel and the display device, and thereby improving the display effect of the display panel and the display device.

[0008] In a second aspect, an embodiment of the present application provides a display device, and the display device includes the display panel provided in the first aspect.

[0009] The display device provided in the embodiment of the present application includes a display panel, wherein the distance between the surface of the main body of the first shading layer facing away from the substrate and the substrate along the substrate thickness direction is a first distance, and the distance between the surface of the light-emitting unit facing away from the substrate and the substrate along the substrate thickness direction is a second distance. By making the first distance smaller than the second distance, the main body is lower than the light-emitting unit, thereby reducing the probability of the uncured main body contacting the surface of the light-emitting unit facing away from the substrate, thereby alleviating the phenomenon of the main body climbing to the surface of the light-emitting unit facing away from the substrate, thereby reducing the blocking of the light output of the light-emitting unit by the first shading layer, and increasing the brightness of the display panel and the display device, thereby improving the display effect of the display panel and the display device.

[0010] In a third aspect, an embodiment of the present application provides a method for preparing a display panel, comprising:

[0011] A substrate is provided; a plurality of light-emitting units are formed at intervals on one side of the substrate; a first light-shielding layer is formed on one side of the substrate; wherein the first light-shielding layer includes a main body portion, the main body portion is arranged between at least part of two adjacent light-emitting units, a distance between a surface of the main body portion facing away from the substrate and the substrate along the thickness direction of the substrate is a first distance, a distance between a surface of the light-emitting unit facing away from the substrate and the substrate along the thickness direction of the substrate is a second distance, and the first distance is smaller than the second distance.

[0012] The method for preparing a display panel provided in an embodiment of the present application is used to prepare a display panel, wherein the distance between the surface of the main body of the first shading layer facing away from the substrate and the substrate along the thickness direction of the substrate is a first distance, and the distance between the surface of the light-emitting unit facing away from the substrate and the substrate along the thickness direction of the substrate is a second distance. By making the first distance smaller than the second distance, the main body is lower than the light-emitting unit, thereby reducing the probability of contact between the uncured main body and the surface of the light-emitting unit facing away from the substrate, thereby alleviating the phenomenon of the main body climbing to the surface of the light-emitting unit facing away from the substrate, thereby reducing the blocking of the light output of the light-emitting unit by the first shading layer, thereby increasing the brightness of the display panel and the display device, and thus improving the display effect of the display panel and the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A cross-sectional view of a display panel provided in an embodiment of the present application.

[0014] Figure 2 Another cross-sectional view of the display panel provided in an embodiment of the present application.

[0015] Figure 3 Another cross-sectional view of the display panel provided in an embodiment of the present application.

[0016] Figure 4 Another cross-sectional view of the display panel provided in an embodiment of the present application.

[0017] Figure 5 Another cross-sectional view of the display panel provided in an embodiment of the present application.

[0018] Figure 6 A schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application.

[0019] Figure 7 This is a schematic diagram of the structure after providing a substrate according to an embodiment of the present application.

[0020] Figure 8 A schematic diagram of the structure after the second light-shielding layer is formed according to an embodiment of the present application.

[0021] Fig. 9 This is a schematic diagram of the structure after the light-emitting unit is formed according to an embodiment of the present application.

[0022] Description of reference numerals:

[0023] 100, display panel; 100a, first area; 100b, second area; 101, array layer; 110, first light shielding layer; 111, main body; 112, extension part; 113, protrusion; 114, auxiliary part; 120, second light shielding layer; 121, binding opening; 130, third light shielding layer; 140, light-emitting unit; 141, first electrode; 142, second electrode; 143, light-emitting functional part; 151, substrate; 152, pad; 153, conductive trace; 160, transistor; 161, first pole; 162, second pole; 163, gate; 164, active layer; 171, first conductive member; 172, second conductive member; 173, third conductive member; 174, fourth conductive member; 180, insulating layer. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] When describing positional relationships, unless otherwise specified, when an element such as a layer, film, or substrate is referred to as being "on" another element, it can be directly on the other element or there may be intervening elements. Further, when a layer is referred to as being "under" another layer, it can be directly under or there may be one or more intervening elements. It is also understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or there may be one or more intervening elements.

[0027] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0028] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present application.

[0029] It should also be understood that when interpreting an element, even if not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" can mean within one or more standard deviations, which are not limited here.

[0030] Furthermore, in the specification, the phrase “planar distribution schematic diagram” refers to a drawing when a target portion is viewed from above, and the phrase “cross-sectional schematic diagram” refers to a drawing when a section taken by vertically cutting the target portion is viewed from the side.

[0031] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0032] As described in the background technology section, in the related art, the display panel may include an array substrate and a plurality of Micro LEDs located on the array substrate, and the plurality of Micro LEDs are electrically connected to the array substrate. A light shielding layer is arranged between each two adjacent Micro LEDs, and the light shielding layer can help to achieve an integrated black effect. Among them, the surface of the Micro LED facing away from the array substrate can form the light emitting surface of the Micro LED. In the process of forming the light shielding layer, an initial light shielding layer in a liquid state (or semi-solid state) can be arranged between each two adjacent Micro LEDs by inkjet printing, and then the initial light shielding layer is cured to form a light shielding layer.

[0033] However, since the initial light-shielding layer has a certain fluidity and the microstructure on the light-emitting surface of the Micro LED is prone to cause a capillary effect, the initial light-shielding layer is prone to climb along the side wall of the Micro LED and cover the light-emitting surface of the Micro LED, thereby damaging the brightness of the Micro LED and causing lower brightness of the display panel and the display device, affecting the display effect of the display panel and the display device.

[0034] Based on the above technical problems, the embodiments of the present application provide a display panel, a display device and a method for preparing a display panel, which can reduce the blocking of the light output by the first shading layer to the light-emitting unit, increase the display brightness of the display panel and the display device, and thus enhance the display effect of the display panel and the display device.

[0035] The above is the core idea of ​​this application. The technical solutions in the embodiments of this application will be described clearly and completely below in conjunction with the drawings in the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Combined with Figure 1-9 The display panel, the display device and the method for manufacturing the display panel provided in the embodiments of the present application are described.

[0037] The embodiment of the present application provides a display device, which includes a display panel 100 in any of the following embodiments. Therefore, the display device also has the beneficial effects of the display panel 100 in the following embodiments, and the similarities can be understood by referring to the explanation of the display panel 100 below, which will not be repeated here.

[0038] Exemplarily, the display device can be a mobile phone or any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, industrial control equipment, medical display screens, touch interactive terminals, etc. The embodiments of the present application do not specifically limit this.

[0039] In some embodiments, the display panel 100 may include a sub-millimeter light emitting diode display (Mini Light Emitting Diode Display, referred to as Mini LED) or a micro light emitting diode display (Micro Light Emitting Diode Display, referred to as Micro LED), etc. The embodiment of the present application is described by taking the display panel 100 as a micro light emitting diode display as an example.

[0040] The display panel 100 provided in the embodiment of the present application is described below.

[0041] See also Figure 1 The display panel 100 may include a substrate 151 , and the substrate 151 may provide support for a film layer to be formed subsequently.

[0042] See also Figure 1 , the display panel 100 may include a light emitting unit 140 ( Figure 1 Only one light emitting unit 140 is shown in the figure), there may be multiple light emitting units 140, and multiple light emitting units 140 are arranged at intervals on one side of the substrate 151. Multiple light emitting units 140 are arranged at intervals, which may mean that there is a gap between two adjacent light emitting units 140.

[0043] Exemplarily, the light emitting unit 140 may include a micro light emitting diode.

[0044] For example, see Figure 1 The light-emitting unit 140 may include a light-emitting functional part 143, a first electrode 141, and a second electrode 142. The first electrode 141 and the second electrode 142 are disposed on a side of the light-emitting functional part 143 facing the substrate 151. The first electrode 141 and the second electrode 142 are disposed at intervals, that is, there is a gap between the first electrode 141 and the second electrode 142. One of the first electrode 141 and the second electrode 142 may be an anode, and the other may be a cathode. The embodiment of the present application is described by taking the first electrode 141 as an anode and the second electrode 142 as a cathode as an example.

[0045] The first light shielding layer 110 provided in the embodiment of the present application is described below.

[0046] See also Figure 1, the display panel 100 may include a first light shielding layer 110, which is disposed on the side of the substrate 151 facing the light-emitting unit 140. The first light shielding layer 110 may help achieve an integrated black effect. The first light shielding layer 110 may include a main body 111, which is disposed between at least part of two adjacent light-emitting units 140, and the surface of the main body 111 facing away from the substrate 151 and the substrate 151 along the thickness direction of the substrate 151 (i.e. Figure 1 The distance between the surface of the light-emitting unit 140 facing away from the substrate 151 and the substrate 151 along the thickness direction of the substrate 151 is a first distance D1, and the distance between the surface of the light-emitting unit 140 facing away from the substrate 151 and the substrate 151 along the thickness direction of the substrate 151 is a second distance D2, and the first distance D1 is smaller than the second distance D2. In this way, the first distance D1 is smaller than the second distance D2, so that the main body 111 is lower than the light-emitting unit 140, and the probability of the uncured main body 111 contacting the surface of the light-emitting unit 140 facing away from the substrate 151 can be reduced, thereby alleviating the phenomenon that the main body 111 climbs to the surface of the light-emitting unit 140 facing away from the substrate 151, so as to reduce the blocking of the light emitting unit 140 by the first light-shielding layer 110, thereby improving the brightness of the display panel 100 and the display device, and improving the display effect of the display panel 100 and the display device.

[0047] The surface of the light-emitting unit 140 facing away from the substrate 151 may be a light-emitting surface of the light-emitting unit 140. The process of forming the first light-shielding layer 110 may be to first form a first initial light-shielding layer, the first initial light-shielding layer is liquid or semi-solid, and the first initial light-shielding layer has a certain fluidity, and then solidify the first initial light-shielding layer to form the first light-shielding layer 110. The first initial light-shielding layer is the unsolidified first light-shielding layer 110.

[0048] Exemplarily, the difference between the second distance D2 and the first distance D1 is less than or equal to 5 μm, so that the difference can be avoided from being too large, and the thickness of the main body 111 can be avoided from being too low, so that the main body 111 can better wrap the first electrode 141 and the second electrode 142 of the light-emitting unit 140, which can improve the shading effect of the main body 111 and help achieve an integrated black effect. For example, the difference between the second distance D2 and the first distance D1 can be 2 μm, 3 μm, 4 μm, 5 μm, or any value less than 5 μm.

[0049] In some embodiments, see Figure 2 and Figure 4The first light shielding layer 110 may further include an extension portion 112, which is disposed on the side of the main body 111 away from the substrate 151, and covers the side wall of the light emitting unit 140 and the edge of the surface of the light emitting unit 140 away from the substrate 151. The extension portion 112 only covers the side wall of the light emitting unit 140 and the edge of the light emitting surface of the light emitting unit 140, but does not cover the middle area of ​​the light emitting surface of the light emitting unit 140, so that the extension portion 112 has little effect on the light emitting of the light emitting unit 140.

[0050] Exemplarily, an extension portion 112 may be disposed on at least one light emitting unit 140. When a plurality of light emitting units 140 are all provided with an extension portion 112, there is a spacing between the extension portions 112 on two adjacent light emitting units 140.

[0051] Exemplarily, there is a third distance between the surface of the extension portion 112 facing the light-emitting unit 140 and the surface of the extension portion 112 facing away from the light-emitting unit 140, and the third distance is equivalent to the thickness of the extension portion 112. There is a fourth distance between the surface of the main body 111 facing the substrate 151 and the surface of the main body 111 facing away from the substrate 151, and the fourth distance is equivalent to the thickness of the main body 111. The third distance can be less than the minimum value of the fourth distance, so that the thickness of the extension portion 112 is relatively small, which can reduce the absorption of light of the light-emitting unit 140 by the extension portion 112, which is beneficial to reducing the adverse effect of the extension portion 112 on the light emission of the light-emitting unit 140. In addition, since the thickness of the extension portion 112 is relatively small, the fluidity of the uncured extension portion 112 can be reduced, so that the uncured extension portion 112 is not easy to move toward the center direction of the light-emitting surface of the light-emitting unit 140, which can reduce the coverage of the light-emitting surface of the light-emitting unit 140 by the extension portion 112, which is further beneficial to reducing the adverse effect of the extension portion 112 on the light emission of the light-emitting unit 140. The minimum value of the fourth distance is the thickness value at the position where the thickness of the main body 111 is the smallest.

[0052] Exemplarily, the ratio of the third distance to the minimum value of the fourth distance may be in the range of 1 / 10-1 / 5, so that the ratio can be prevented from being too small, the thickness of the extension portion 112 can be prevented from being too small, and the difficulty of manufacturing the extension portion 112 can be reduced. In addition, the ratio can be prevented from being too large, the thickness of the extension portion 112 can be prevented from being too large, and the adverse effect of the extension portion 112 on the light output of the light emitting unit 140 can be reduced. For example, the ratio may be in the range of 1 / 10, 1 / 8, 1 / 7, 1 / 6, 1 / 5, or any value between 1 / 10-1 / 5.

[0053] Exemplarily, the minimum value of the fourth distance may be less than or equal to 5 μm, thereby preventing the thickness of the main body 111 from being too large, and facilitating the main body 111 to be lower than the light-emitting unit 140, thereby alleviating the phenomenon that the main body 111 climbs to the surface of the light-emitting unit 140 that is away from the substrate 151, thereby reducing the shielding of the light-emitting unit 140 by the first light-shielding layer 110, and improving the brightness of the display panel 100 and the display device. For example, the minimum value of the fourth distance may be 2 μm, 3 μm, 4 μm, 5 μm, or any value less than 5 μm.

[0054] For example, see Figure 2 , the distance between the orthographic projection of the side wall of the extension portion 112 close to the center of the light emitting unit 140 on the plane where the substrate 151 is located and the outer contour of the orthographic projection of the surface of the light emitting unit 140 away from the substrate 151 on the plane where the substrate 151 is located is the fifth distance D5, the fifth distance D5 is the width of the light emitting surface of the light emitting unit 140 covered by the extension portion 112, and the fifth distance D5 is less than or equal to 5μm, so that the extension portion 112 covers a smaller edge of the light emitting surface of the light emitting unit 140, so that the extension portion 112 has a smaller impact on the light emitting of the light emitting unit 140. For example, the fifth distance D5 can be 2μm, 3μm, 4μm, 5μm or any value less than 5μm.

[0055] In some embodiments, see Figure 2 Part of the first light-shielding layer 110 may also be located between the first electrode 141 and the second electrode 142. The part of the first light-shielding layer 110 may be an auxiliary portion 114. The auxiliary portion 114 is located between the first electrode 141 and the second electrode 142. The first electrode 141 and the second electrode 142 of the light-emitting unit 140, and the first conductive member 171 and the second conductive member 172 are well covered by the auxiliary portion 114 and the main body portion 111, thereby avoiding reflection caused by exposure of the first electrode 141 and the second electrode 142, and the first conductive member 171 and the second conductive member 172.

[0056] Exemplarily, the material of the first light shielding layer 110 may include ink.

[0057] The second light shielding layer 120 provided in the embodiment of the present application is described below.

[0058] In some embodiments, see Figure 3 The display panel 100 may further include a second light shielding layer 120, which is located between the first light shielding layer 110 and the substrate 151. The second light shielding layer 120 encloses a plurality of binding openings 121 ( Figure 3Only one binding opening 121 is shown in the figure), multiple binding openings 121 are arranged corresponding to multiple light-emitting units 140, and the binding openings 121 can expose the first conductive member 171 and the second conductive member 172. The first electrode 141 of the light-emitting unit 140 is bound and connected to the first conductive member 171, and the second electrode 142 of the light-emitting unit 140 is bound and connected to the second conductive member 172. The orthographic projection of the light-emitting unit 140 on the plane where the substrate 151 is located overlaps with the orthographic projection of the corresponding binding opening 121 on the plane where the substrate 151 is located, and the first electrode 141 and the second electrode 142 of the light-emitting unit 140 extend into the binding opening 121 to achieve binding connection with the first conductive member 171 and the second conductive member 172.

[0059] Among them, in the embodiment of the present application, the corresponding arrangement of A and B may refer to: one A is corresponding to at least one B, or one B is corresponding to at least one A. The embodiment of the present application is described by taking the corresponding arrangement of one A and one B as an example. For example, the corresponding arrangement of multiple binding openings 121 and multiple light-emitting units 140 may refer to the corresponding arrangement of one light-emitting unit 140 and at least one binding opening 121, or one binding opening 121 and at least one light-emitting unit 140. The embodiment of the present application is described by taking the corresponding arrangement of one binding opening 121 and one light-emitting unit 140 as an example.

[0060] For some examples, see Figure 3 and Figure 4 The orthographic projection of the light-emitting unit 140 on the plane where the substrate 151 is located is located within the orthographic projection of the corresponding binding opening 121 on the plane where the substrate 151 is located, and there is a distance between the orthographic projection of the light-emitting unit 140 on the plane where the substrate 151 is located and the orthographic projection of the second light-shielding layer 120 on the plane where the substrate 151 is located. The opening size of the binding opening 121 is set to be larger than the size of the light-emitting unit 140, so that the opening size of the binding opening 121 is larger, which can provide a larger flat space for binding the light-emitting unit 140, which is beneficial to improving the fault tolerance rate of binding.

[0061] For other examples, see Figure 5The orthographic projection of the light-emitting unit 140 on the plane where the substrate 151 is located completely covers the orthographic projection of the corresponding binding opening 121 on the plane where the substrate 151 is located, and the orthographic projection of the light-emitting unit 140 on the plane where the substrate 151 is located overlaps with the orthographic projection of the second shading layer 120 on the plane where the substrate 151 is located. The opening size of the binding opening 121 is set to be smaller than the size of the light-emitting unit 140, so that the opening size of the binding opening 121 is smaller, so that the laying area of ​​the second shading layer 120 is larger and the coverage range is wider. During the binding process, the energy uniformity of each area of ​​the light-emitting unit 140 is good when laser bonding is adopted. In addition, it is also beneficial to improve the pixel density (Pixels Per Inch, referred to as ‌PPI).

[0062] In some embodiments, the optical density of the first light-shielding layer 110 may be smaller than the optical density of the second light-shielding layer 120, so that the light-shielding ability of the second light-shielding layer 120 is stronger than that of the first light-shielding layer 110. The second light-shielding layer 120 has a stronger light-shielding ability, which can better avoid the metal reflection under the second light-shielding layer 120, so there is no need to set a thicker main body 111 to avoid the metal reflection. The thickness of the main body 111 can be set thinner, which is beneficial for the main body 111 to be lower than the light-emitting unit 140, reducing the probability of the uncured main body 111 contacting the light-emitting surface of the light-emitting unit 140, thereby reducing the first light-shielding layer 110 from blocking the light output of the light-emitting unit 140 and improving the brightness of the display panel 100 and the display device.

[0063] Among them, optical density (OD) is a characteristic measure of an object's absorption of light, that is, the ratio of the amount of incident light to the amount of reflected light or transmitted light, which can be used to describe the material's ability to absorb light. The greater the optical density, the greater the light absorption capacity and the stronger the light shielding ability.

[0064] Exemplarily, the color of the first light shielding layer 110 is lighter than the color of the second light shielding layer 120. For example, the color of the first light shielding layer 110 may be gray, and the color of the second light shielding layer 120 may be black.

[0065] In the related art, the first light shielding layer 110 is provided alone without the second light shielding layer 120. At this time, if the main body 111 is provided too thin, the light absorption rate is low and the light shielding effect is poor. If the main body 111 is provided too thick, the main body 111 will climb to the light emitting surface of the light emitting unit 140 and affect the light emission. The embodiment of the present application provides the first light shielding layer 110 and the second light shielding layer 120 at the same time, so that the reflectivity can be effectively reduced, and the first light shielding layer 110 can be provided thinner to ensure the light emission effect.

[0066] Exemplarily, before the light-emitting unit 140 is bound to the first conductive member 171 and the second conductive member 172, the second light-shielding layer 120 can be formed so that the second light-shielding layer 120 does not block the light-emitting unit 140. However, due to the high patterning accuracy of the second light-shielding layer 120, it is also necessary to reserve a binding opening 121 for the binding position and the redundant position. The metal (for example, the first conductive member 171 and the second conductive member 172) exposed by the binding opening 121 has a high reflectivity. After the light-emitting unit 140 is bound to the first conductive member 171 and the second conductive member 172, the first light-shielding layer 110 can be formed, and the metal exposed by the binding opening 121 can be shielded by the first light-shielding layer 110.

[0067] Exemplarily, the optical density of the first light shielding layer 110 ranges from 0.3 / μm to 1.0 / μm, so as to avoid the optical density of the first light shielding layer 110 being too small, avoid the poor light shielding effect of the first light shielding layer 110, and avoid the optical density of the first light shielding layer 110 being too large, so as to reduce the influence of the extension portion 112 on the light output of the light emitting unit 140. For example, the optical density of the first light shielding layer 110 can be 0.3 / μm, 0.5 / μm, 0.7 / μm, 1.0 / μm, or any value between 0.3 / μm and 1.0 / μm.

[0068] Exemplarily, the optical density of the second light-shielding layer 120 ranges from 1.5 / μm to 3.5 / μm, thereby preventing the optical density of the second light-shielding layer 120 from being too low, improving the light-shielding effect of the second light-shielding layer 120, and helping to reduce the thickness of the first light-shielding layer 110. In addition, it can also prevent the optical density of the second light-shielding layer 120 from being too high, thereby reducing the cost of the second light-shielding layer 120. For example, the optical density of the second light-shielding layer 120 can be 1.5 / μm, 2 / μm, 2.5 / μm, 3 / μm, 3.5 / μm, or any value between 1.5 / μm and 3.5 / μm.

[0069] Exemplarily, the thickness of the second light shielding layer 120 ranges from 1 μm to 5 μm, so that the thickness of the second light shielding layer 120 can be prevented from being too thin, which is beneficial to improving the light shielding effect of the second light shielding layer 120. In addition, the thickness of the second light shielding layer 120 can be prevented from being too thick, which is beneficial to the thinness of the display panel 100. For example, the thickness of the second light shielding layer 120 can be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, or any value between 1 μm and 5 μm.

[0070] In some embodiments, see Figure 5The orthographic projection of the second light-shielding layer 120 on the plane where the substrate 151 is located is located within the orthographic projection of the first light-shielding layer 110 on the plane where the substrate 151 is located. The first light-shielding layer 110 completely covers the second light-shielding layer 120, which is beneficial to improving the uniformity of the light-shielding effect of the display panel 100.

[0071] The third light shielding layer 130 provided in the embodiment of the present application is described below.

[0072] In some embodiments, see Figure 5 The display panel 100 may also include a pad 152 and a third light-shielding layer 130. The pad 152 and the third light-shielding layer 130 may be located at the edge of the substrate 151. The pad 152 and the third light-shielding layer 130 are located between the substrate 151 and the first light-shielding layer 110. The third light-shielding layer 130 is located on the side of the pad 152 away from the substrate 151. Among them, the pad 152 can be formed before the second light-shielding layer 120, and it is necessary to remove part of the second light-shielding layer 120 to expose the pad 152. At this time, the orthographic projection of the pad 152 on the plane where the substrate 151 is located at least partially does not overlap with the orthographic projection of the second light-shielding layer 120 on the plane where the substrate 151 is located, thereby facilitating the electrical connection between the pad 152 exposed outside the second light-shielding layer 120 and the conductive trace 153. By setting the third light-shielding layer 130, the pad 152 and the conductive trace 153 can be covered to reduce the reflection of the pad 152 and the conductive trace 153.

[0073] For example, see Figure 5 The display panel 100 includes a first area 100a and a second area 100b, wherein the second area 100b is arranged near the edge of the display panel 100, and the second area 100b is arranged at least partially around the first area 100a. The pad 152 is located in the second area 100b. The first area 100a can be a display area. The second area 100b can be a non-display area, or can also be a display area.

[0074] In some embodiments, see Figure 5 The display panel 100 may include a conductive trace 153, one end of which is electrically connected to the pad 152, and the conductive trace 153 extends along the side wall of the substrate 151 to the side of the substrate 151 away from the light-emitting unit 140, so that the conductive trace 153 is connected to the electronic component arranged on the side of the substrate 151 away from the light-emitting unit 140.

[0075] In some embodiments, see Figure 5The third shading layer 130 can also cover the conductive trace 153 on the side wall of the substrate 151, and cover at least part of the conductive trace 153 located on the side of the substrate 151 away from the light-emitting unit 140, so that the third shading layer 130 can better cover the conductive trace 153 and reduce the reflection of the conductive trace 153 on the side wall of the substrate 151.

[0076] In some embodiments, see Figure 5 The distance between the surface of the second light-shielding layer 120 close to the substrate 151 and the surface away from the substrate 151 is the sixth distance, which may be the thickness of the second light-shielding layer 120; the distance between the surface of the third light-shielding layer 130 close to the substrate 151 and the surface away from the substrate 151 is the seventh distance, which may be the thickness of the third light-shielding layer 130; the seventh distance is greater than the sixth distance, so that the thickness of the third light-shielding layer 130 is larger, which is beneficial to improving the flatness of the surface of the third light-shielding layer 130 away from the substrate 151, so as to improve the leveling property of the uncured first light-shielding layer 110, and is beneficial to improving the flatness of the surface of the first light-shielding layer 110 away from the substrate 151.

[0077] Exemplarily, the first light shielding layer 110 may be formed by inkjet printing.

[0078] Exemplarily, the second light shielding layer 120 is formed by coating.

[0079] Exemplarily, the third light shielding layer 130 may be formed by pad printing.

[0080] In some embodiments, see Figure 5 , the outer contour of the orthographic projection of the first light shielding layer 110 on the plane where the substrate 151 is located is at least partially located within the orthographic projection of the third light shielding layer 130 on the plane where the substrate 151 is located. For example, in the second area 100b, the outer contour of the orthographic projection of the first light shielding layer 110 on the plane where the substrate 151 is located is located within the orthographic projection of the third light shielding layer 130 on the plane where the substrate 151 is located. The outer contour of the first light shielding layer 110 is arranged closer to the center of the display panel 100 than the third light shielding layer 130 located on the side wall of the substrate 151, which can reduce the probability of the uncured first light shielding layer 110 flowing along the side wall of the substrate 151, thereby facilitating the improvement of the flatness of the surface of the first light shielding layer 110 away from the substrate 151.

[0081] See also Figure 5In the embodiment in which the first light shielding layer 110 is formed by inkjet printing, the uncured first light shielding layer 110 has an edge stacking effect, and the first light shielding layer 110 is easy to form a protrusion 113 at the edge, and the protrusion 113 is arranged at the edge of the surface of the main body 111 on the side away from the substrate 151. By making the contact angle between the material of the first light shielding layer 110 (before curing) and the material of the third light shielding layer 130 (after curing) greater than or equal to 10°, so that the contact angle is large, the hydrophilicity difference between the material of the first light shielding layer 110 and the material of the third light shielding layer 130 is large, so that the material of the first light shielding layer 110 and the material of the third light shielding layer 130 have a certain repulsion, the edge stacking effect of the uncured first light shielding layer 110 can be alleviated, so that the thickness of the protrusion 113 (that is, the size of the protrusion 113 along the thickness direction of the substrate 151) can be small, which is beneficial to improve the flatness of the surface of the first light shielding layer 110 on the side away from the substrate 151. For example, the contact angle may be 10°, 20°, 30°, 50°, or any value greater than 10°.

[0082] The contact angle is the angle formed between the liquid and the solid surface. It is the balance angle between the surface tension of the liquid and the surface tension of the solid. When the liquid spreads on the solid surface, it forms an angle that is tangent to the solid-liquid interface. This angle is the contact angle. A large contact angle means that the hydrophilicity and hydrophobicity of the liquid and the solid are quite different, and there is a certain repulsion between the two.

[0083] Exemplarily, the size of the protrusion 113 along the thickness direction of the substrate 151 may be less than or equal to 1 μm, so that the size of the protrusion 113 along the thickness direction of the substrate 151 is small, which is beneficial to improve the flatness of the surface of the first light shielding layer 110 away from the substrate 151. For example, the size of the protrusion 113 along the thickness direction of the substrate 151 may be 0.1 μm, 0.3 μm, 0.5 μm, 0.9 μm, 0.9 μm, 1 μm or any value less than 1 μm.

[0084] In some embodiments, see Figure 1The display panel 100 further includes an array layer 101, which is located between the substrate 151 and the light-emitting unit 140. A driving circuit is provided in the array layer 101, and the driving circuit is connected to the light-emitting unit 140. The driving circuit includes a transistor 160, and the transistor 160 may include an active layer 164, a gate 163, a first electrode 161, and a second electrode 162. The active layer 164 may be located in the semiconductor layer, the gate 163 may be located in the first conductive layer, the first electrode 161 and the second electrode 162 may be located in the second conductive layer, the third conductive member 173 and the fourth conductive member 174 may be located in the third conductive layer, and the first conductive member 171 and the second conductive member 172 may be located in the fourth conductive layer. The semiconductor layer, the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer may be stacked in sequence in a direction away from the substrate 151. An insulating layer 180 may be provided between the substrate 151 and the semiconductor layer, between the semiconductor layer and the first conductive layer, between two adjacent conductive layers, and on the side of the fourth conductive layer away from the substrate 151.

[0085] One of the first electrode 161 and the second electrode 162 of the transistor 160 may be a source, and the other may be a drain.

[0086] For example, see Figure 1 The first conductive member 171 is connected to the driving circuit through the third conductive member 173 to provide a first driving signal to the first electrode 141 of the light-emitting unit 140. For example, the first driving signal may be a high level signal or other signals. The second conductive member 172 is connected to the fourth conductive member 174 to provide a second driving signal to the second electrode 142 of the light-emitting unit 140. For example, the second driving signal may be a low level signal or other signals.

[0087] For example, see Figure 1 At least part of the insulating layer 180 between the first conductive member 171 and the third conductive member 173 and the insulating layer 180 between the third conductive member 173 and the transistor 160 may be a planarization layer, and the planarization layer may provide good planar support.

[0088] For example, see Figure 1 The insulating layer 180 on the side of the first conductive member 171 facing away from the substrate 151 may be a passivation layer, which may protect the array layer 101 from the influence of the external environment and improve the stability and reliability of the display panel 100 .

[0089] Exemplarily, at least a portion of the insulating layer 180 between the substrate 151 and the active layer 164 may be a barrier layer for blocking substances such as water and oxygen from invading the transistor 160 to avoid affecting the performance of the transistor 160 .

[0090] In some embodiments, multiple insulating layers 180 located on the side of the gate 163 away from the substrate 151 can be arranged in the first region 100a and outside the second region 100b, and the thickness of the first shading layer 110 located in the first region 100a is less than the thickness of the first shading layer 110 located in the second region 100b.

[0091] Exemplarily, the materials of the first electrode 141, the second electrode 142, the multiple conductive layers (the first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer), the conductive trace 153, and the pad 152 can be metals such as titanium, silver, copper, aluminum, molybdenum, or alloys, or conductive oxides (such as indium tin oxide (Indium Tin Oxide, abbreviated as ITO), indium zinc oxide (Indium Zinc Oxide, abbreviated as IZO), zinc oxide (ZnO), aluminum zinc oxide (Aluminum Zinc Oxid; abbreviated as AZO)), zinc gallium oxide, titanium tantalum oxide, tin oxide, cadmium oxide, indium oxide, any one or more.

[0092] Exemplarily, the material of the insulating layer 180 may be silicon nitride, silicon oxynitride, silicon oxide, or various new organic insulating materials, or metal oxides with high dielectric constants such as aluminum oxide, tantalum oxide, and the like.

[0093] The following is a description of a method for manufacturing the display panel 100 provided in an embodiment of the present application.

[0094] The method for preparing the display panel 100 provided in the embodiment of the present application can be used to prepare the display panel 100 in the above embodiment, see Figure 6 , the preparation method may include:

[0095] S100: providing a substrate.

[0096] First, see Figure 7 , providing a substrate 151, which can provide support for the film layer formed subsequently.

[0097] S200: forming a plurality of light emitting units spaced apart from each other on one side of the substrate.

[0098] See also Fig. 9 After providing the substrate 151 , the process may include forming a light emitting unit 140 on one side of the substrate 151 . The light emitting unit 140 may be a plurality of light emitting units 140 , and the plurality of light emitting units 140 are arranged at intervals.

[0099] See also Figure 8 Before forming the light emitting unit 140 , the process may include forming an array layer 101 , where the array layer 101 may include a transistor 160 , a third conductive member 173 , a fourth conductive member 174 , a first conductive member 171 , a second conductive member 172 , and a plurality of insulating layers 180 .

[0100] See also Figure 8 , before forming the light-emitting unit 140 on one side of the substrate 151, after forming the array layer 101, it may include forming a second light-shielding layer 120 on one side of the substrate 151. The second light-shielding layer 120 encloses a plurality of binding openings 121, and the plurality of binding openings 121 are arranged corresponding to the plurality of light-emitting units 140, and the orthographic projection of the light-emitting unit 140 on the plane where the substrate 151 is located overlaps with the orthographic projection of the corresponding binding opening 121 on the plane where the substrate 151 is located. Among them, the binding opening 121 can expose the first conductive member 171 and the second conductive member 172, so as to facilitate binding connection with the first electrode 141 and the second electrode 142 of the light-emitting unit 140. Since the second light-shielding layer 120 is prepared before forming the light-emitting unit 140, the second light-shielding layer 120 will not affect the light output of the light-emitting unit 140.

[0101] S300: forming a first shading layer on one side of the substrate; wherein the first shading layer comprises a main body portion, the main body portion is arranged between at least part of two adjacent light-emitting units, the distance between a surface of the main body portion facing away from the substrate and the substrate along the thickness direction of the substrate is a first distance, the distance between a surface of the light-emitting unit facing away from the substrate and the substrate along the thickness direction of the substrate is a second distance, and the first distance is smaller than the second distance.

[0102] See also Figure 3 After forming the light emitting unit 140 , the method may include forming a first light shielding layer 110 on one side of the substrate 151 . The first light shielding layer 110 is located on a side of the second light shielding layer 120 away from the substrate 151 .

[0103] The first light shielding layer 110 includes a main body 111, which is disposed between at least two adjacent light emitting units 140, and a first distance D1 is a distance between the surface of the main body 111 facing away from the substrate 151 and the substrate 151 along the thickness direction of the substrate 151, and a second distance D2 is a distance between the surface of the light emitting unit 140 facing away from the substrate 151 and the substrate 151 along the thickness direction of the substrate 151, and the first distance D1 is less than the second distance D2. In this way, the first distance D1 is less than the second distance D2, so that the main body 111 is lower than the light emitting unit 140, and the probability of the uncured main body 111 contacting the surface of the light emitting unit 140 facing away from the substrate 151 can be reduced, so that the phenomenon of the main body 111 climbing to the light emitting surface of the light emitting unit 140 can be alleviated, so as to reduce the shielding of the light emitting unit 140 by the first light shielding layer 110, and improve the brightness of the display panel 100 and the display device, so as to enhance the display effect of the display panel 100 and the display device.

[0104] Since the first light-shielding layer 110 is prepared after the light-emitting unit 140 is formed, the first light-shielding layer 110 may climb up to the light-emitting surface of the light-emitting unit 140 if it is too thick. In the embodiment of the present application, the thickness of the first light-shielding layer 110 can be reduced by simultaneously providing the first light-shielding layer 110 and the second light-shielding layer 120, thereby alleviating the situation where the first light-shielding layer 110 climbs up to the light-emitting surface of the light-emitting unit 140, thereby improving the brightness of the display panel 100 and the display device.

[0105] See also Figure 3 and Fig. 9 After forming the second light shielding layer 120 and before forming the first light shielding layer 110, the method may include forming a third light shielding layer 130, which is located between the substrate 151 and the first light shielding layer 110. The third light shielding layer 130 is located on the side of the pad 152 and the conductive trace 153 away from the substrate 151, and the pad 152 and the conductive trace 153 are covered by the third light shielding layer 130 to reduce the reflection of the pad 152 and the conductive trace 153. The pad 152 may be formed before the second light shielding layer 120, and part of the second light shielding layer 120 needs to be removed to expose the pad 152. At this time, the orthographic projection of the pad 152 on the plane where the substrate 151 is located does not overlap with the orthographic projection of the second light shielding layer 120 on the plane where the substrate 151 is located, thereby facilitating the electrical connection between the pad 152 and the conductive trace 153.

[0106] Exemplarily, the first light shielding layer 110 may be formed by inkjet printing. Compared with forming the first light shielding layer 110 by a thermoplastic film lamination process, the inkjet printing method may make the main body 111 lower than the light emitting surface of the light emitting unit 140 .

[0107] Exemplarily, the second light shielding layer 120 is formed by coating.

[0108] Exemplarily, the third light shielding layer 130 may be formed by pad printing, which is beneficial to improving the flatness of the surface of the third light shielding layer 130 facing away from the substrate 151 , thereby facilitating improving the leveling property of the uncured first light shielding layer 110 .

[0109] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A display panel, characterized in that: include: substrate; A plurality of light-emitting units are arranged at intervals on one side of the substrate; A first light shielding layer is disposed on one side of the substrate; Among them, the first shading layer includes a main body portion, and the main body portion is arranged between at least partially adjacent two of the light-emitting units. The distance between the surface of the main body portion facing away from the substrate and the substrate along the thickness direction of the substrate is a first distance, and the distance between the surface of the light-emitting unit facing away from the substrate and the substrate along the thickness direction of the substrate is a second distance, and the first distance is smaller than the second distance.

2. The display panel according to claim 1, characterized in that: The first light shielding layer further includes an extension portion, which is disposed on a side of the main body away from the substrate and covers a side wall of the light emitting unit and an edge of a surface of the light emitting unit away from the substrate.

3. The display panel according to claim 2, characterized in that: A third distance is provided between a surface of the extension portion facing the light-emitting unit and a surface facing away from the light-emitting unit, a fourth distance is provided between a surface of the main body portion facing the substrate and a surface facing away from the substrate, and the third distance is less than a minimum value of the fourth distance; and / or, a difference between the second distance and the first distance is less than or equal to 5 μm; And / or, the ratio of the third distance to the minimum value of the fourth distance is in the range of 1 / 10-1 / 5; and / or, the minimum value of the fourth distance is less than or equal to 5 μm; And / or, the distance between the orthographic projection of the side wall of the extension portion close to the center of the light emitting unit on the plane where the substrate is located and the outer contour of the orthographic projection of the surface of the light emitting unit facing away from the substrate on the plane where the substrate is located is less than or equal to 5 μm.

4. The display panel according to any one of claims 1 to 3, characterized in that: The light-emitting unit comprises a light-emitting functional part, a first electrode and a second electrode, wherein the first electrode and the second electrode are arranged at intervals on a side of the light-emitting functional part facing the substrate; Part of the first light shielding layer is also located between the first electrode and the second electrode.

5. The display panel according to any one of claims 1 to 3, characterized in that: The display panel also includes a second shading layer, which is located between the first shading layer and the substrate; the second shading layer encloses a plurality of binding openings, and the plurality of binding openings are arranged corresponding to the plurality of light-emitting units, and the orthographic projections of the light-emitting units on the plane where the substrate is located overlap with the orthographic projections of the corresponding binding openings on the plane where the substrate is located.

6. The display panel according to claim 5, characterized in that: The orthographic projection of the light emitting unit on the plane where the substrate is located is located within the orthographic projection of the corresponding binding opening on the plane where the substrate is located, and there is a distance between the orthographic projection of the second light shielding layer on the plane where the substrate is located; Alternatively, the orthographic projection of the light emitting unit on the plane where the substrate is located completely covers the orthographic projection of the corresponding binding opening on the plane where the substrate is located, and overlaps with the orthographic projection of the second light shielding layer on the plane where the substrate is located.

7. The display panel according to claim 5, characterized in that: The optical density of the first light-shielding layer is smaller than the optical density of the second light-shielding layer.

8. The display panel according to claim 5, characterized in that: The thickness of the second light shielding layer is in the range of 1 μm to 5 μm; And / or, the optical density of the first light-shielding layer is in the range of 0.3 / μm-1.0 / μm; And / or, the optical density of the second light-shielding layer is in the range of 1.5 / μm-3.5 / μm; And / or, the orthographic projection of the second light-shielding layer on the plane where the substrate is located is located within the orthographic projection of the first light-shielding layer on the plane where the substrate is located.

9. The display panel according to claim 5, characterized in that: The display panel further comprises a pad and a third light shielding layer located at the edge of the substrate, the pad and the third light shielding layer are located between the substrate and the first light shielding layer, and the third light shielding layer is located on a side of the pad away from the substrate.

10. The display panel according to claim 9, characterized in that: The outer contour of the orthographic projection of the first light-shielding layer on the plane where the substrate is located is at least partially located within the orthographic projection of the third light-shielding layer on the plane where the substrate is located; And / or, the orthographic projection of the solder pad on the plane where the substrate is located at least partially does not overlap with the orthographic projection of the second light shielding layer on the plane where the substrate is located; And / or, the third light-shielding layer is formed by pad printing.

11. The display panel according to any one of claims 1 to 3, characterized in that: The first light shielding layer further comprises a protrusion, and the protrusion is arranged at an edge of a surface of the main body away from the substrate; A dimension of the protrusion along a thickness direction of the substrate is less than or equal to 1 μm.

12. The display panel according to any one of claims 1 to 3, characterized in that: The light emitting unit includes a micro light emitting diode.

13. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 12.

14. A method for preparing a display panel, characterized in that: include: providing a substrate; A plurality of light emitting units are formed on one side of the substrate and are arranged at intervals; forming a first light shielding layer on one side of the substrate; Among them, the first shading layer includes a main body portion, and the main body portion is arranged between at least partially adjacent two of the light-emitting units. The distance between the surface of the main body portion facing away from the substrate and the substrate along the thickness direction of the substrate is a first distance, and the distance between the surface of the light-emitting unit facing away from the substrate and the substrate along the thickness direction of the substrate is a second distance, and the first distance is smaller than the second distance.

15. The method for preparing a display panel according to claim 14, characterized in that: Before forming a plurality of light emitting units spaced apart on one side of the substrate, the method comprises: A second light-shielding layer is formed on one side of the substrate; the second light-shielding layer is located between the first light-shielding layer and the substrate, the second light-shielding layer encloses a plurality of binding openings, the plurality of binding openings are arranged corresponding to the plurality of light-emitting units, and the orthographic projections of the light-emitting units on the plane where the substrate is located overlap with the orthographic projections of the corresponding binding openings on the plane where the substrate is located; The forming of the first light shielding layer on one side of the substrate includes: forming the first light shielding layer after forming the light emitting unit.

16. The method for preparing a display panel according to claim 15, characterized in that: The first light shielding layer is formed by inkjet printing; And / or, the second light-shielding layer is formed by coating.

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