Display substrate

Abstract

Disclosed herein is a display substrate including a substrate, a plurality of light emitting devices, a light absorbing layer, a light transmitting layer, and a transparent protection. The plurality of light-emitting devices are arranged on the substrate at intervals, and interval regions are arranged between the adjacent light-emitting devices; the light absorption layer is at least located in the spacer region; the light-transmitting layer is continuously arranged on one side, away from the substrate, of the light-absorbing layer and one side, away from the substrate, of the light-emitting device; the transparent protection layer is arranged on one side of the light-transmitting layer away from the light-absorbing layer; wherein the plurality of light-emitting devices comprise a first light-emitting device, a second light-emitting device and a third light-emitting device, and the interval between the first light-emitting device and the second light-emitting device is smaller than the interval between the second light-emitting device and the third light-emitting device. The difference between the minimum thickness of the light-absorbing layer in the spacer region between the first light-emitting device and the second light-emitting device and the minimum thickness of the light-absorbing layer in the spacer region between the second light-emitting device and the third light-emitting device is less than or equal to 2.0 [mu] m.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, and in particular relates to a display substrate. Background Technology

[0002] The display substrate's encapsulation structure includes a black layer to ensure the substrate appears black in a dark state. In related technologies, potting encapsulation can lead to a thicker encapsulation structure, increasing the risk of seam defects and resulting in poor reworkability and difficulty in removing the surface encapsulant. If a film-coated encapsulation method is used, placing the black layer on the light-emitting side of the light-emitting device requires a certain level of transmittance to ensure the substrate's transmittance and luminous efficiency, which can result in insufficient blackness and poor ink color in a dark state. Alternatively, filling the gaps between the light-emitting devices with black adhesive to form the black layer can lead to uneven black layer thickness, reducing ink color uniformity and light emission uniformity in a dark state.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This disclosure aims to at least partially solve the technical problems of poor or uneven ink color in display substrates and the resulting uneven light emission. To this end, this disclosure provides a display substrate.

[0005] This disclosure provides a display substrate, the display substrate comprising:

[0006] Base,

[0007] Multiple light-emitting devices are spaced apart on the substrate, with gaps between adjacent light-emitting devices;

[0008] A light-absorbing layer, wherein the light-absorbing layer is at least located within the interval region;

[0009] A light-transmitting layer, the light-transmitting layer being continuously disposed on the side of the light-absorbing layer away from the substrate and on the side of the light-emitting device away from the substrate; and,

[0010] A transparent protective layer is disposed on the side of the light-transmitting layer away from the light-absorbing layer;

[0011] The plurality of light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device. The interval between the first light-emitting device and the second light-emitting device is smaller than the interval between the second light-emitting device and the third light-emitting device. The difference between the minimum thickness of the light-absorbing layer in the interval region between the first light-emitting device and the second light-emitting device and the minimum thickness of the light-absorbing layer in the interval region between the second light-emitting device and the third light-emitting device is less than or equal to 2.0 μm.

[0012] In some embodiments, the thickness of the light-absorbing layer located within the interval region is negatively correlated with the distance between the location of the light-absorbing layer and the light-emitting device closest to the location of the light-absorbing layer.

[0013] In some embodiments, a portion of the light-transmitting layer is located within the interval region, and the light-transmitting layer located within the interval region is conformal to the light-absorbing layer located within the interval region;

[0014] The surface of the light-transmitting layer located within the interval region facing the substrate is an arc-shaped surface that bulges towards the substrate.

[0015] In some embodiments, the plurality of light-emitting devices form a plurality of light-emitting device groups, and each light-emitting device group includes at least two light-emitting devices;

[0016] The spacing between adjacent light-emitting devices within each group of light-emitting devices is smaller than the spacing between adjacent light-emitting devices in adjacent groups of light-emitting devices;

[0017] Wherein, the first light-emitting device and the second light-emitting device are located in the same group of light-emitting devices, and the second light-emitting device and the third light-emitting device are adjacent light-emitting devices between adjacent groups of light-emitting devices.

[0018] In some embodiments, the spacing K1 between adjacent light-emitting devices in adjacent light-emitting device groups and the maximum spacing K2 between light-emitting devices in each light-emitting device group satisfy the following: K1 / K2 is greater than or equal to 2, and / or the spacing between adjacent light-emitting devices within the light-emitting device group is in the range of 60μm to 100μm.

[0019] In some embodiments, each of the light-emitting device groups constitutes a pixel of the display substrate;

[0020] Each of the light-emitting device groups includes three light-emitting devices, and each light-emitting device in the same light-emitting device group emits a different color.

[0021] In some embodiments, the minimum thickness of the light-absorbing layer in the interval region is less than a first height and greater than or equal to two-thirds of the first height, where the first height is the distance between the side of the light-emitting device away from the substrate and the substrate.

[0022] In some embodiments, in the interval region, the total thickness of the light-transmitting layer and the light-absorbing layer is greater than a first height, where the first height is the distance between the side of the light-emitting device away from the substrate and the substrate;

[0023] The surface of the light-transmitting layer on the side away from the substrate extends parallel to the substrate.

[0024] In some embodiments, the light-absorbing layer in the interval region is continuously distributed between adjacent light-emitting devices, and the light-absorbing layer is in contact with both the light-emitting device and the substrate.

[0025] In some embodiments, the surface of the light-emitting device away from the substrate does not have the light-absorbing layer material, or...

[0026] The surface of the light-emitting device on the side away from the substrate is not completely covered by the light-absorbing layer.

[0027] In some embodiments, a portion of the light-absorbing layer is located on the surface of the light-emitting device away from the substrate, and the maximum thickness of the light-absorbing layer on the surface of the light-emitting device away from the substrate is less than or equal to 2.0 μm.

[0028] In some embodiments, the minimum thickness of the light-absorbing layer in the interval region is in the range of 40 μm to 120 μm.

[0029] In some embodiments, the surface of the light-emitting device on the side away from the substrate is not completely covered by the light-absorbing layer.

[0030] In some embodiments, the transmittance of the light-absorbing layer is less than or equal to 30%, and / or the transmittance of the light-transmitting layer and the transparent protective layer is greater than or equal to 85%.

[0031] In some embodiments, the minimum thickness of the light-absorbing layer in the interval region is in the range of 40 μm to 120 μm, and the thickness of the light-transmitting layer at the position of the light-emitting device away from the substrate surface is greater than 20 μm.

[0032] In some embodiments, the material of the light-absorbing layer includes at least one of acrylic resin and epoxy resin, the material of the light-transmitting layer includes at least one of acrylic resin and epoxy resin, and the material of the transparent protective layer includes at least one of polyethylene terephthalate and polycarbonate.

[0033] In some embodiments, both the light-absorbing layer and the light-transmitting layer are resilient.

[0034] The embodiments disclosed herein have at least the following beneficial effects:

[0035] In the aforementioned display substrate, multiple light-emitting devices are spaced apart on a substrate, with gaps between adjacent devices. A light-absorbing layer is located at least within these gaps, which to some extent prevents the light-absorbing layer from blocking light emission from the surface of the light-emitting devices away from the substrate. Therefore, when increasing the dark-state blackness of the display module by reducing the transmittance of the light-absorbing layer, the light-absorbing layer does not affect the transmittance of the light emitted by the light-emitting devices, thus ensuring relatively high luminous efficiency of the display substrate. In the display substrate, the multiple light-emitting devices include a first, second, and third light-emitting device. The gap between the first and second light-emitting devices is smaller than the gap between the second and third light-emitting devices. That is, there are gaps of different sizes in the display substrate; the gap between the first and second light-emitting devices is relatively small, and the gap between the second and third light-emitting devices is relatively large. Simultaneously, the difference between the minimum thickness of the light-absorbing layer in the gap between the first and second light-emitting devices and the minimum thickness of the light-absorbing layer in the gap between the second and third light-emitting devices is less than or equal to 2.0 μm. In other words, the difference between the minimum thickness of the light-absorbing layer in a relatively small interval region and the thickness of the light-absorbing layer in a relatively large interval region is less than or equal to 2.0 μm. That is, the difference in the minimum thickness of the light-absorbing layer in interval regions of different sizes is less than or equal to 2.0 μm, which ensures that the minimum thickness of the light-absorbing layer in different interval regions of the display substrate is relatively uniform, thereby ensuring the uniformity of the ink color of the display substrate. In addition, the relatively uniform minimum thickness of the light-absorbing layer in different interval regions of the display substrate can also avoid the defect of uneven light emission caused by large differences in the minimum thickness of the light-absorbing layer to a certain extent. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A cross-sectional structural diagram of a display substrate in the related art is shown;

[0038] Figure 2A top view of another display substrate in the related art is shown;

[0039] Figure 3 It shows Figure 2 A schematic diagram of the cross-sectional structure of the display substrate along the AA direction;

[0040] Figure 4 It shows Figure 2 3D scanning microscope images of the area around the light-emitting devices on the display substrate;

[0041] Figure 5 A top view of the display substrate is shown in an embodiment of this disclosure;

[0042] Figure 6 It shows Figure 5 A schematic diagram of the BB-direction cross-sectional structure of the display substrate;

[0043] Figure 7 It shows Figure 6 A magnified view at point C;

[0044] Figure 8 A cross-sectional structural schematic diagram of a display substrate according to another embodiment of the present disclosure is shown;

[0045] Figure 9 A cross-sectional structural schematic diagram of the display substrate is shown in yet another embodiment of the present disclosure;

[0046] Figure 10 A schematic flowchart of a packaging method for a display substrate is shown in an embodiment of this disclosure;

[0047] Figure 11 It shows Figure 10 Schematic diagram of the structure of the intermediate light-absorbing layer before and after lamination with the substrate;

[0048] Figure 12 It shows Figure 10 A schematic diagram of the structure of the second composite film before and after lamination with the light-absorbing layer and the light-emitting device;

[0049] Figure 13 It shows Figure 6 3D scanning microscope images of the area around the light-emitting devices on the display substrate;

[0050] Figure 14 A schematic diagram of a packaging method for a display substrate in the related art is shown;

[0051] Figure 15 It shows Figure 14 A cross-sectional view of a display substrate prepared by a packaging method for a display substrate.

[0052] Figure label:

[0053] 100, Substrate; 200, Light-emitting device group; 300, Light-absorbing layer; 300', Light-absorbing material layer; 400, Light-transmitting layer; 400', Light-transmitting material layer; 500, Transparent protective layer; 600, First carrier film; 10, Black layer; 20, Transparent layer; 30, Protective layer; F1, First direction; F2, Second direction; F3, Third direction. Detailed Implementation

[0054] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0055] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this disclosure. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this disclosure provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0056] It should be noted that, for ease of description, in Figures 1 to 9 The diagram shows a first direction, a second direction, or a third direction, where the first direction is the thickness direction of the black layer / light-absorbing layer, the second direction and the third direction are the relative position directions between multiple light-emitting devices, and the size of the spacing region can be regarded as the distance between the two sides in the second direction and / or the distance between the two sides in the third direction.

[0057] This disclosure is described below with reference to the accompanying drawings and specific embodiments:

[0058] The display substrate's encapsulation structure includes a black layer to make the substrate appear black in a dark state. In related technologies, if potting encapsulation is used, it can easily lead to a larger encapsulation structure thickness, increasing the risk of seam defects in the display substrate. It also suffers from poor reworkability and difficulty in removing the surface encapsulation adhesive. In related technologies, such as... Figure 1 As shown, if a film-coated encapsulation method is used, with the black layer placed on the light-emitting side of the light-emitting device (i.e., in the first direction, the black layer is located on the side of the light-emitting device furthest from the substrate), the black layer needs to have a certain transmittance to ensure the transmittance and luminous efficiency of the display substrate. This will result in the display substrate not being dark enough in the dark state, leading to poor ink color. In related technologies, such as... Figure 2 and Figure 3As shown, if a black layer is formed by filling the gaps between light-emitting devices with black glue, the thickness of the black layer in the first direction will be uneven, which will reduce the uniformity of ink color and light emission uniformity when the display substrate is in a dark state. Figure 2 and Figure 3 As shown, the black layer formed by filling the gaps in the light-emitting device with black glue has poor flatness and significant thickness fluctuations. It can be seen that there are areas where the black layer lacks black glue; this is because the substrate is contaminated, causing uneven wetting of the black glue and resulting in pits where the glue cannot adhere. Figure 3 As shown, the thickness of the black layer formed by the black glue filling the gaps between the light-emitting devices varies considerably in the gap area of ​​the devices. This is because the black glue will climb up the sidewalls of the light-emitting devices due to capillary action. However, because the gap areas on both sides of the light-emitting devices are different sizes, the degree to which the black glue is affected by capillary action varies, resulting in different degrees of black glue climbing up the sidewalls of the light-emitting devices. Figure 4 As shown, the thickness of the black layer varies significantly across different spacing regions of the light-emitting device. Spacing regions 81 and 84 are relatively small, exhibiting more severe capillary action, resulting in greater variation in black layer thickness within these regions. Consequently, the black layer is thicker closer to the light-emitting device and thinner where the distance from the device is greater. Spacing regions 82 and 83 are relatively large, with weaker capillary action, leading to less variation in black layer thickness within these regions. In the dark state of the display substrate, this results in lower black color intensity in spacing regions 81 and 84, consequently reducing the uniformity of black color intensity and light emission uniformity in the dark state of the display substrate.

[0059] To address the technical problems of poor or uneven ink color in display substrates and the resulting uneven light emission, this disclosure provides a first aspect of a display substrate, such as... Figures 5 to 9The display substrate includes a substrate, multiple light-emitting devices, a light-absorbing layer, a light-transmitting layer, and a transparent protective layer. The multiple light-emitting devices are spaced apart on the substrate, with gaps between adjacent light-emitting devices. The light-absorbing layer is located at least within the gaps. The light-transmitting layer is continuously disposed on the side of the light-absorbing layer away from the substrate and on the side of the light-emitting devices away from the substrate. The transparent protective layer is disposed on the side of the light-transmitting layer away from the light-absorbing layer. The multiple light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device. The gap between the first and second light-emitting devices is smaller than the gap between the second and third light-emitting devices. The difference between the minimum thickness of the light-absorbing layer located in the gap region between the first and second light-emitting devices and the minimum thickness of the light-absorbing layer located in the gap region between the second and third light-emitting devices is less than or equal to 2.0 μm.

[0060] The display substrate proposed in the embodiments of this disclosure, such as Figures 5 to 9 As shown, multiple light-emitting devices are spaced apart on the substrate, with gaps between adjacent devices. A light-absorbing layer is located at least within these gaps, which helps to prevent the light-absorbing layer from blocking light emission from the surface of the light-emitting device furthest from the substrate. Therefore, when increasing the dark-state blackness of the display module by reducing the transmittance of the light-absorbing layer, the light-absorbing layer does not affect the transmittance of the light emitted by the light-emitting devices, ensuring relatively high luminous efficiency of the display substrate. In the display substrate, the multiple light-emitting devices include a first, second, and third light-emitting device. The gap between the first and second light-emitting devices is smaller than the gap between the second and third light-emitting devices. That is, there are gaps of different sizes in the display substrate; the gap between the first and second light-emitting devices is relatively small, and the gap between the second and third light-emitting devices is relatively large. Simultaneously, the difference between the minimum thickness of the light-absorbing layer in the gap between the first and second light-emitting devices and the minimum thickness of the light-absorbing layer in the gap between the second and third light-emitting devices is less than or equal to 2.0 μm. In other words, the difference between the minimum thickness of the light-absorbing layer in a relatively small interval region and the thickness of the light-absorbing layer in a relatively large interval region is less than or equal to 2.0 μm. That is, the difference in the minimum thickness of the light-absorbing layer in interval regions of different sizes is less than or equal to 2.0 μm, which ensures that the minimum thickness of the light-absorbing layer in different interval regions of the display substrate is relatively uniform, thereby ensuring the uniformity of the ink color of the display substrate. In addition, the relatively uniform minimum thickness of the light-absorbing layer in different interval regions of the display substrate can also avoid the defect of uneven light output caused by large differences in the minimum thickness of the light-absorbing layer to a certain extent.

[0061] In some embodiments of this disclosure, the substrate can be made of a rigid material or a flexible material. In some embodiments of this disclosure, the light-emitting device can be selected from light-emitting diodes (LEDs), sub-millimeter light-emitting diodes (Mini LEDs), and micro light-emitting diodes (Micro LEDs).

[0062] In some embodiments of this disclosure, such as Figure 6 and Figure 7 As shown, the transparent protective layer is located on the side of the light-transmitting layer away from the light-absorbing layer, and is used to protect the light-transmitting layer and the light-emitting device and light-absorbing layer below it.

[0063] As an alternative implementation method, such as Figure 6 and Figure 7 As shown, the thickness of the light-absorbing layer within the interval region is negatively correlated with the distance between the location of the light-absorbing layer and the light-emitting device closest to the location of the light-absorbing layer.

[0064] In some embodiments of this disclosure, such as Figure 6 and Figure 7 As shown, within the same interval region, the thickness of the light-absorbing layer varies with the distance between it and the light-emitting device closest to it. As the light-absorbing layer moves closer to the light-emitting device (i.e., the distance between them decreases), the thickness of the light-absorbing layer increases; conversely, as the light-absorbing layer moves further away from the light-emitting device (i.e., the distance between them increases), the thickness of the light-absorbing layer decreases. Figure 7 As shown in the figure, the distance L1 between the light-absorbing layer at point M and the light-emitting device near point M, and the thickness D1 of the light-absorbing layer at point M; the distance L2 between the light-absorbing layer at point N and the light-emitting device near point N, and the thickness D2 of the light-absorbing layer at point N. It can be seen from the figure that the distance L1 between the light-absorbing layer at point M and the light-emitting device near point M is greater than the distance L2 between the light-absorbing layer at point N and the light-emitting device near point N, and the thickness D1 of the light-absorbing layer at point M is less than the thickness D2 of the light-absorbing layer at point N. In other words, within the same interval region, for the light-emitting device forming that interval region, the smaller the distance to the light-emitting device, the greater the thickness of the light-absorbing layer; conversely, the greater the distance to the light-emitting device, the smaller the thickness of the light-absorbing layer. Figure 6 and Figure 7As shown, within the same interval region, the light-absorbing layer is recessed towards the substrate from the central region. The distance between the light-absorbing layer in the middle region of the interval region and the light-emitting device closest to the middle region is relatively large, so the thickness of the light-absorbing layer in the middle region of the interval region is relatively small; the distance between the light-absorbing layer in the edge region of the interval region and the light-emitting device closest to the edge region is relatively small, so the thickness of the light-absorbing layer in the edge region of the interval region is relatively large.

[0065] As an alternative implementation method, such as Figure 6 As shown, a portion of the light-transmitting layer is located within the interval region, and the light-transmitting layer within the interval region is conformal to the light-absorbing layer within the interval region; wherein, the surface of the light-transmitting layer within the interval region facing the substrate is an arc surface convex towards the substrate.

[0066] In some embodiments of this disclosure, such as Figure 6 As shown, the thickness of the light-absorbing layer within the interval region is negatively correlated with the distance between the light-absorbing layer and the light-emitting device closest to it. Therefore, within the same interval region, the light-absorbing layer is concave towards the substrate in its central region. By placing a portion of the light-transmitting layer within the interval region, ensuring that the light-transmitting layer within the interval region conforms to the light-absorbing layer within the interval region, and making the surface of the light-transmitting layer within the interval region facing the substrate a convex arc surface, the interval region can be filled with the light-transmitting layer, achieving planarization of the display substrate on the side of the light-emitting device away from the substrate. Simultaneously, by encapsulating the light-transmitting layer and the light-absorbing layer together on the side of the light-emitting device, the side of the light-emitting device is encapsulated, which can, to some extent, prevent water and oxygen corrosion.

[0067] As an alternative implementation method, such as Figure 5 and Figure 6 As shown, multiple light-emitting devices form multiple light-emitting device groups, and each light-emitting device group includes at least two light-emitting devices; the interval between adjacent light-emitting devices within each light-emitting device group is smaller than the interval between adjacent light-emitting devices between adjacent light-emitting device groups; wherein, the first light-emitting device and the second light-emitting device are located in the same light-emitting device group, and the second light-emitting device and the third light-emitting device are adjacent light-emitting devices between adjacent light-emitting device groups.

[0068] In some embodiments of this disclosure, in such Figure 5 and 6 In the illustrated embodiment, multiple light-emitting devices form multiple light-emitting device groups, and each light-emitting device group may include three light-emitting devices, namely a first light-emitting device, a second light-emitting device, and a third light-emitting device.

[0069] In such Figure 5 and 6In the illustrated embodiment, the light-emitting devices within each light-emitting device group are arranged at intervals in the second direction. The interval between adjacent light-emitting devices within each light-emitting device group refers to the interval between adjacent light-emitting devices in the second direction. Therefore, for... Figure 6 For the light-emitting device group located on the left side of the figure, the spacing between adjacent light-emitting devices in each light-emitting device group refers to the spacing between the first light-emitting device and the second light-emitting device in the second direction, and the spacing between the first light-emitting device and the third light-emitting device in the second direction.

[0070] In such Figure 5 and 6 In the illustrated embodiment, the light-emitting devices within each light-emitting device group are spaced apart in the second direction, and the light-emitting device groups are spaced apart in both the second and third directions. Adjacent light-emitting device groups have spacing between adjacent light-emitting devices in both the second and third directions. In the third direction, such as... Figure 5 As shown, the spacing between adjacent light-emitting devices in adjacent groups can refer to the spacing between the first and second columns of light-emitting devices from the left in the diagram, in a third-direction direction, or it can refer to the spacing between the second and third columns of light-emitting devices from the left in the diagram, in a third-direction direction. In the second direction, as... Figure 6 As shown, the light-emitting device group on the left and the light-emitting device group on the right are adjacent light-emitting device groups, and the light-emitting devices adjacent to each other are the second light-emitting device and the third light-emitting device; the interval between adjacent light-emitting devices in adjacent light-emitting device groups refers to the interval between the second light-emitting device in the left light-emitting device group and the third light-emitting device in the right light-emitting device group in the second direction.

[0071] As an alternative implementation method, such as Figure 5 and Figure 6 As shown, the spacing K1 between adjacent light-emitting devices in adjacent light-emitting device groups and the maximum spacing K2 between light-emitting devices in each light-emitting device group satisfy the following: K1 / K2 is greater than or equal to 2, and / or the distance between adjacent light-emitting devices within a light-emitting device group is in the range of 60μm to 100μm.

[0072] In some embodiments of this disclosure, such as Figure 5 and Figure 6As shown, the spacing K1 between adjacent light-emitting devices in adjacent light-emitting device groups and the maximum spacing K2 of light-emitting devices in each light-emitting device group satisfy the following: when K1 / K2 is greater than or equal to 2, that is, when the difference between the spacing K1 between adjacent light-emitting devices in adjacent light-emitting device groups and the maximum spacing K2 of light-emitting devices in each light-emitting device group is large, the flatness of the light-absorbing layer can still be achieved, and the difference between the minimum thickness of the light-absorbing layer in the spacing region between the first light-emitting device and the second light-emitting device and the minimum thickness of the light-absorbing layer in the spacing region between the second light-emitting device and the third light-emitting device is less than or equal to 2.0 μm.

[0073] In some embodiments of this disclosure, such as Figure 5 and Figure 6 As shown, the spacing between adjacent light-emitting devices within a light-emitting device group ranges from 60 μm to 100 μm. The spacing between adjacent light-emitting devices within adjacent light-emitting device groups generally varies with the pixel density of the display substrate. When the pixel density of the display substrate is relatively high, the spacing between adjacent light-emitting devices within adjacent light-emitting device groups is relatively small; when the pixel density of the display substrate is relatively low, the spacing between adjacent light-emitting devices within adjacent light-emitting device groups is relatively large. If the spacing between adjacent light-emitting devices within adjacent light-emitting device groups is greater than the spacing between adjacent light-emitting devices within a single light-emitting device group, then the spacing between adjacent light-emitting devices within adjacent light-emitting device groups is greater than 60 μm to 100 μm.

[0074] As an alternative implementation method, such as Figure 5 and Figure 6 As shown, each light-emitting device group constitutes a pixel of the display substrate; wherein, each light-emitting device group includes three light-emitting devices, and each light-emitting device in the same light-emitting device group emits a different color.

[0075] In some embodiments of this disclosure, such as Figure 5 and Figure 6 As shown, each group of light-emitting devices constitutes a pixel on the display substrate; each group includes three light-emitting devices, and each device within the same group emits a different color of light. That is, within the same group / pixel, the three light-emitting devices emit different colors of light; for example, a single light-emitting device can emit red, green, and blue light respectively. Figure 5 and Figure 6 In the illustrated embodiment, each light-emitting device group includes three light-emitting devices, namely a first light-emitting device, a second light-emitting device, and a third light-emitting device. The first light-emitting device can emit green light, the second light-emitting device can emit blue light, and the third light-emitting device can emit red light, so that the light-emitting device group can constitute a pixel of the display substrate.

[0076] As an alternative implementation method, such as Figures 6 to 9 As shown, the minimum thickness of the light-absorbing layer within the spacing region is less than the first height but greater than or equal to two-thirds of the first height, where the first height is the distance between the side of the light-emitting device away from the substrate and the substrate. In some embodiments of this disclosure, such as Figures 6 to 9 As shown, the first height is the distance between the side of the light-emitting device away from the substrate and the substrate, that is, the height of the light-emitting side of the light-emitting device relative to the substrate. The first height is affected by one or more of the following factors: the size of the light-emitting device in actual application, the height of the pads, the amount of die-bonding solder paste used, and the substrate ink layer, which may cause the size of the first height to fluctuate. When the size of the first height fluctuates, the minimum or average value of the first height shall be used as the standard.

[0077] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, the thickness of the light-absorbing layer varies in the first direction within the same interval region. The light-absorbing layer has a shape that is concave towards the substrate in the middle within the same interval region. The minimum thickness of the light-absorbing layer within the same interval region best represents the thickness characteristics of the light-absorbing layer within that interval region. Therefore, the minimum thickness of the light-absorbing layer within the interval region can be used as a benchmark for comparison with the first height.

[0078] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, by making the thickness of the light-absorbing layer less than the first height, it can be ensured that when the light-absorbing layer is formed in the interval region, the light-absorbing layer can be pierced by the light-emitting device so that the light-absorbing layer avoids the top light-emitting side of the light-emitting device to a certain extent, and ensures that the light-absorbing layer can fill the interval region.

[0079] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, by making the thickness of the light-absorbing layer less than the first height, it can be ensured that when the light-absorbing layer is formed in the interval region, the light-absorbing layer can be pierced by the light-emitting device so that the light-absorbing layer avoids the top light-emitting side of the light-emitting device to a certain extent, and ensures that the light-absorbing layer can fill the interval region.

[0080] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, the light-absorbing layer is recessed towards the substrate in the middle of the spacer region. The minimum thickness of the light-absorbing layer in the middle region of the same spacer region reflects the original thickness of the light-absorbing layer. The thickness of the light-absorbing layer in the edge region (adjacent to the light-emitting device) of the spacer region is affected by the light-absorbing material layer corresponding to the light-emitting device during fabrication. The light-absorbing material layer corresponding to the light-emitting device is squeezed into the spacer region, resulting in an increase in the thickness of the light-absorbing layer in the edge region (adjacent to the light-emitting device) compared to the thickness in the middle region of the spacer region. However, the thickness of the light-absorbing layer in the edge region (adjacent to the light-emitting device) of the spacer region can still be kept below the first height to a certain extent.

[0081] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, by ensuring that the minimum thickness of the light-absorbing layer is greater than or equal to two-thirds of the first height, it can be ensured that the light-absorbing layer can fill the gap area to a large extent, giving the light-absorbing layer in the gap area sufficient thickness to ensure that the display substrate has sufficient ink color. At the same time, it can also make the absorption layer adhere to the substrate of the gap area, avoiding gaps between the light-absorbing layer and the substrate layer.

[0082] In some embodiments of this disclosure, optionally, the thickness of the light-absorbing layer may be less than or equal to eleven-twelfths of the first height and greater than or equal to nine-twelfths of the first height. For example... Figure 9 As shown, the thickness of the light-absorbing layer can be closer to the first height to maximize the thickness of the light-absorbing layer and thus ensure the light-absorbing effect of the light-absorbing layer.

[0083] As an alternative implementation method, such as Figures 6 to 9 As shown, in the interval region, the total thickness of the light-transmitting layer and the light-absorbing layer is greater than the first height, which is the distance between the side of the light-emitting device away from the substrate and the substrate; the surface of the light-transmitting layer away from the substrate extends parallel to the substrate.

[0084] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, in the interval region, by making the total thickness of the light-transmitting layer and the light-absorbing layer greater than the first height, it can be ensured that the light-emitting device is covered under the light-transmitting layer, avoiding direct contact between the light-emitting device and the transparent protective layer. This can prevent the light-emitting device from hitting the transparent protective layer and causing deformation of the transparent protective layer, and also prevent the transparent protective layer from pressing on the light-emitting device and causing damage to the light-emitting device.

[0085] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, the surface of the light-transmitting layer away from the substrate extends parallel to the substrate. In other words, the side of the display substrate closest to the transparent protective layer extends parallel to the substrate, making the side of the display substrate closest to the transparent protective layer flat. This facilitates the installation of the transparent protective layer and allows it to adhere tightly to the light-transmitting layer. Furthermore, flattening the side of the display substrate closest to the transparent protective layer improves the flatness of the surface of the transparent protective layer away from the substrate, which is more conducive to the fabrication of subsequent structural layers.

[0086] As an alternative implementation method, such as Figures 5 to 9 As shown, the light-absorbing layer in the interval area is continuously distributed between adjacent light-emitting devices, and the light-absorbing layer is in contact with the light-emitting devices and the substrate.

[0087] In some embodiments of this disclosure, such as Figures 5 to 9As shown, by continuously distributing the light-absorbing layer in the interval region between adjacent light-emitting devices, and ensuring that the light-absorbing layer is in contact with both the light-emitting device and the substrate, while maintaining a small thickness difference between the light-absorbing layers in different interval regions and a relatively uniform thickness, the light absorption effect of the light-absorbing layer in the interval region can be ensured. This can, to a certain extent, avoid light leakage or reflection caused by the light-absorbing layer not being in contact with the light-emitting device or the substrate, thereby improving the light emission uniformity of the display substrate.

[0088] As an alternative implementation method, such as Figure 6 , Figure 8 as well as Figure 9 As shown, the surface of the light-emitting device away from the substrate has no light-absorbing layer material, or the surface of the light-emitting device away from the substrate is not completely covered by the light-absorbing layer.

[0089] In some embodiments of this disclosure, optionally, such as Figure 6 and Figure 9 As shown, by removing the light-absorbing layer material from the surface of the light-emitting device away from the substrate, the light-absorbing layer can be prevented from affecting the light emission of the surface of the light-emitting device away from the substrate, thereby ensuring the transmittance of the surface of the light-emitting device away from the substrate.

[0090] In some embodiments of this disclosure, optionally, such as Figure 8 As shown, by ensuring that the surface of the light-emitting device away from the substrate is not completely covered by the light-absorbing layer, at least a portion of the surface of the light-emitting device away from the substrate is exposed relative to the light-absorbing layer. This allows the light-emitting device to emit light through this portion, ensuring the luminous efficiency of the device and avoiding black spot phenomena.

[0091] As an alternative implementation method, such as Figure 8 As shown, a portion of the light-absorbing layer is located on the surface of the light-emitting device away from the substrate, and the maximum thickness of the light-absorbing layer on the surface of the light-emitting device away from the substrate is less than 2.0 μm.

[0092] In some embodiments of this disclosure, such as Figure 8As shown, a portion of the light-absorbing layer is located on the surface of the light-emitting device away from the substrate. The maximum thickness of the light-absorbing layer on this surface is less than 2.0 μm. In other words, the maximum thickness of the light-absorbing layer on the surface of the light-emitting device away from the substrate is less than 2.0 μm. Because the thickness of the light-absorbing layer on this surface is small, its presence has little impact on the light extraction efficiency and transmittance of the light-emitting device on the side away from the substrate, thus ensuring the overall light extraction efficiency and uniformity of the display substrate to a certain extent. Furthermore, for example, the minimum thickness of the light-absorbing layer in the interleaved area is in the range of 40 μm to 120 μm to ensure the blackness of the display substrate in the dark state. In related technologies employing a single-layer lamination process (see reference...), Figure 14 , Figure 15 If the minimum thickness of the light-absorbing layer in the interval region is to be within the range of 40μm to 120μm, the black layer on the surface of the light-emitting device away from the substrate often has a large thickness, generally significantly greater than 2.0μm, which has a significant impact on the light extraction efficiency and transmittance of the light-emitting device away from the substrate.

[0093] As an optional implementation, the minimum thickness of the light-absorbing layer in the interval region is in the range of 40 μm to 120 μm.

[0094] In some embodiments of this disclosure, the minimum thickness of the light-absorbing layer in the interval region is in the range of 40 μm to 120 μm. On the one hand, this allows the light-absorbing layer to have sufficient thickness in the interval region, thereby giving the light-absorbing layer good light absorption properties to ensure that the display substrate has sufficient ink color. On the other hand, controlling the minimum thickness of the light-absorbing layer in the interval region to 40 μm to 120 μm can ensure that during the fabrication process of the light-absorbing layer, the light-absorbing layer can be pressed into the interval region and placed in contact with the substrate and the light-emitting device. It can also ensure that during the pressing process, the light-absorbing material layer can be pierced by the light-emitting device to ensure that the surface of the light-emitting device away from the substrate is not completely covered by the light-absorbing layer.

[0095] As an alternative implementation method, such as Figures 6 to 9 As shown, the surface of the light-emitting device on the side away from the substrate is not completely covered by the light-absorbing layer.

[0096] In some embodiments of this disclosure, such as Figures 6 to 9 As shown, by ensuring that the surface of the light-emitting device away from the substrate is not completely covered by the light-absorbing layer, it is possible to ensure that the light emitted from the surface of the light-emitting device away from the substrate is not absorbed by the light-absorbing layer, thus ensuring the luminous efficiency of the light-emitting device. At the same time, since the surfaces of multiple light-emitting devices away from the substrate are not completely covered by the light-absorbing layer, it is also possible to ensure the overall luminous efficiency and light emission uniformity of the substrate, thereby improving the display effect of the display substrate.

[0097] As an alternative implementation, the transmittance of the light-absorbing layer is less than or equal to 30%, and / or the transmittance of the light-transmitting layer and the transparent protective layer is greater than or equal to 85%.

[0098] In some embodiments of this disclosure, by ensuring that the transmittance of the light-absorbing layer is less than or equal to 30%, the transmittance of the light-absorbing layer is kept low, thereby ensuring the light absorption effect of the light-absorbing layer and enabling the display substrate to have sufficient ink color. Experimental measurements have shown that when the transmittance of the light-absorbing layer is less than or equal to 30%, the ink color L value of the display substrate can be kept within a range of less than 31.5.

[0099] In some embodiments of this disclosure, the light-absorbing layer is mainly disposed in the interval area, and the thickness uniformity of the light-absorbing layer is relatively high, so its impact on the luminous efficiency and light emission uniformity of the light-emitting device is small, or even negligible. Optionally, by making the transmittance of the light-transmitting layer and the transparent protective layer greater than or equal to 85%, the overall light emission efficiency of the display substrate can be further ensured, and the impact of the light-transmitting layer and the transparent protective layer on the luminous efficiency of the light-emitting device can be reduced.

[0100] Optionally, the display substrate may employ a light-absorbing layer with a transmittance of 0% to 30%. For example, the transmittance of the light-absorbing layer may be 0%, 5%, 10%, 15%, 20%, 25%, or 30%.

[0101] Optionally, the display substrate may employ a light-transmitting layer and a transparent protective layer with a transmittance of 85% to 100%. For example, the transmittance of the light-transmitting layer may be 85%, 90%, 95%, or 100%, and the transmittance of the transparent protective layer may be 85%, 90%, 95%, or 100%. Transmittance is related not only to the type of material but also to its thickness. In the embodiments of this disclosure, the light-transmitting layer and the transparent protective layer may be made of materials with high transmittance, and the maximum thickness of the light-transmitting layer and the transparent protective layer may be appropriately controlled, thereby ensuring that the overall transmittance of the light-transmitting layer and the transparent protective layer is greater than or equal to 85%. This allows the light-emitting device to have higher transmittance on the side away from the substrate, thus ensuring the overall luminous efficiency of the display substrate.

[0102] As an alternative implementation method, such as Figures 6 to 9 As shown, the minimum thickness of the light-absorbing layer in the interval region is in the range of 40μm to 120μm, and the thickness of the light-transmitting layer located on the side of the light-emitting device away from the substrate surface is greater than 20μm.

[0103] In some embodiments of this disclosure, the minimum thickness of the light-absorbing layer in the interval region is in the range of 40 μm to 120 μm. On the one hand, this allows the light-absorbing layer to have sufficient thickness in the interval region, thereby giving the light-absorbing layer good light absorption properties to ensure that the display substrate has sufficient ink color. On the other hand, controlling the minimum thickness of the light-absorbing layer in the interval region to be in the range of 40 μm to 120 μm can ensure that during the fabrication process of the light-absorbing layer, the light-absorbing layer can be pressed into the interval region and placed in contact with the substrate and the light-emitting device. It can also ensure that during the pressing process, the light-absorbing material layer can be pierced by the light-emitting device to ensure that the surface of the light-emitting device away from the substrate is not completely covered by the light-absorbing layer.

[0104] In some embodiments of this disclosure, the distance between the side of the light-emitting device away from the substrate and the substrate is a first height, which can be 60 μm to 120 μm. When the minimum thickness of the light-absorbing layer in the control interval region is 40 μm to 120 μm, it is also necessary to ensure that the minimum thickness of the light-absorbing layer in the interval region is less than the first height and greater than or equal to two-thirds of the first height. During the fabrication of the light-absorbing layer, the light-absorbing layer can be pressed into the interval region and placed in contact with the substrate and the light-emitting device. It is also possible to ensure that the light-absorbing material layer can be pierced by the light-emitting device during the pressing process, so as to ensure that the surface of the light-emitting device away from the substrate is not completely covered by the light-absorbing layer.

[0105] As an optional implementation, the material of the light-absorbing layer includes at least one of acrylic resin and epoxy resin, the material of the light-transmitting layer includes at least one of acrylic resin and epoxy resin, and the material of the transparent protective layer includes at least one of polyethylene terephthalate and polycarbonate.

[0106] In some embodiments of this disclosure, the material of the light-absorbing layer optionally includes at least one of acrylic resin and epoxy resin, which enables the light-absorbing layer to be cured under certain conditions, making the light-absorbing layer resilient.

[0107] In some embodiments of this disclosure, optionally, the light-absorbing layer material further includes black particles, that is, the material in which black particles are incorporated to form the light-absorbing layer, giving the light-absorbing layer a certain ink-like color. The ink color value and transmittance of the light-absorbing layer can be controlled by controlling the amount of black particles incorporated. Optionally, the black particles can be selected from black materials such as carbon black particles or black dyes.

[0108] In some embodiments of this disclosure, optionally, the material of the light-transmitting layer includes at least one of acrylic resins and epoxy resins. Such materials enable the light-transmitting layer to cure under certain conditions, giving the light-absorbing layer resilience. For example, optionally, the light-transmitting layer material can be an optically transparent adhesive prepared from at least one of acrylic resins and epoxy resins.

[0109] In some embodiments of this disclosure, optionally, the material of the transparent protective layer includes at least one of polyethylene terephthalate (PET) and polycarbonate (PC). Such materials have a certain degree of hardness and strength and can effectively protect the light-transmitting layer in the display substrate.

[0110] In some embodiments of this disclosure, optionally, the material used to prepare the light-transmitting layer may further include white particles and / or transparent particles, that is, white particles and / or transparent particles may be incorporated into the photocurable material. Optionally, the white particles may be titanium dioxide; the transparent particles may be selected from organosilicon or silicon dioxide.

[0111] As an optional implementation, both the light-absorbing layer and the light-transmitting layer are resilient.

[0112] In some embodiments of this disclosure, the light-absorbing layer and the light-transmitting layer are elastic, so that the light-absorbing layer and the light-transmitting layer can maintain their structural characteristics in the display substrate, avoiding changes in the shape, relative position, and other characteristics of the light-absorbing layer and the light-transmitting layer during the use of the display substrate, which would affect the ink color and light emission uniformity of the display substrate; at the same time, the light-absorbing layer and the light-transmitting layer can also have a certain degree of flexibility, which can be used in display devices such as foldable display devices and rollable display devices.

[0113] To address the technical problem of poor or uneven ink color in display substrates, the second aspect of this disclosure proposes a packaging method for the aforementioned display substrate, such as... Figures 10 to 13 As shown, the encapsulation method includes the following steps:

[0114] A substrate is provided, on which multiple light-emitting devices are spaced apart, with spacer regions between the light-emitting devices;

[0115] A first composite film is provided, the first composite film including a first carrier film and a light-absorbing material layer disposed on one side of the first carrier film;

[0116] The first composite film is pressed onto the substrate with the light-absorbing material layer facing the substrate and the light-emitting device, and the first carrier film is removed.

[0117] A second composite film is provided, the second composite film including a transparent protective layer and a light-transmitting material layer disposed on one side of the transparent protective layer;

[0118] The second composite film is pressed together with the light-absorbing layer and the light-emitting device with the light-transmitting material layer facing the light-absorbing layer and the light-emitting device.

[0119] The packaging method for the display substrate proposed in the embodiments of this disclosure, such as... Figures 10 to 13 As shown, the light-absorbing layer and the light-transmitting layer are formed in the display substrate in two separate steps. Figure 11 As shown, the light-absorbing material layer is pressed into the substrate through a first carrier film. During the pressing process of the light-absorbing material layer, the area of ​​the light-absorbing material layer corresponding to the light-emitting device first contacts the side of the light-emitting device away from the substrate. The pressure is transmitted to the light-absorbing material layer through the first carrier film, which makes the pressure on the light-absorbing material layer more uniform. Under the action of pressure, the light-emitting device pierces through the light-emitting device and is uniformly squeezed into the spacer area around the light-emitting device, which makes the thickness of the light-absorbing layer around the light-emitting device more uniform. Then, the light-absorbing layer area corresponding to the spacer area and the light-absorbing layer area pierced by the light-emitting device are filled into the spacer area under the action of pressure, thereby forming a light-absorbing layer with a relatively uniform thickness in the spacer area. This ensures that the difference between the minimum thickness of the light-absorbing layer in the spacer area between the first and second light-emitting devices and the minimum thickness of the light-absorbing layer in the spacer area between the second and third light-emitting devices is less than or equal to 2.0 μm, thus ensuring the uniformity of the thickness of the light-absorbing layer.

[0120] In some embodiments of this disclosure, the display substrate prepared using the packaging method of the display substrate of this disclosure has a relatively uniform thickness of the light-absorbing layer within the same spacing region; the thickness of the light-absorbing layer is also relatively uniform between different spacing regions, which can maintain the minimum thickness difference of the light-absorbing layer in different spacing regions within 2.0 μm, that is, can make the minimum thickness of the light-absorbing layer vary little over the entire display substrate. Figure 13 As shown, it can be seen that within the same interval region, namely interval region 81, interval region 82, interval region 83 and interval region 84, the thickness variation of the light-absorbing layer is relatively small, and the thickness on both sides of the light-emitting device is basically the same; when comparing the different interval regions laterally, the thickness variation between the light-absorbing layers of interval region 81, interval region 82, interval region 83 and interval region 84 is also relatively small.

[0121] In some embodiments of this disclosure, such as Figure 11 As shown, the light-absorbing material layer can be semi-solid. During the pressing process of bonding the first composite film to the substrate with the light-absorbing material layer facing the substrate and the light-emitting device, because the light-absorbing material is semi-solid, it can be pressed more easily and evenly to the periphery of the light-emitting device under the uniform pressure of the first supporting film. Therefore, for the same light-emitting device, the thickness of the light-absorbing layer around the device is more uniform, and the thickness fluctuation of the light-absorbing layer around the device can be controlled within 2.0 μm. This can, to a certain extent, reduce the impact of differences in the thickness of the light-absorbing layer on the light emission of the light-emitting device in the second direction and the third upward side, thereby improving the uniformity of light emission from the light-emitting device in the second direction and the third upward side, and thus improving the overall light emission efficiency and uniformity of the display module.

[0122] In some embodiments of this disclosure, optionally, such as Figure 12 As shown, the light-transmitting layer can be formed by lamination on the side of the light-absorbing layer away from the substrate and the side of the light-emitting device away from the substrate. The light-transmitting material layer can be semi-solid. During the lamination process of pressing the second composite film onto the substrate with the light-transmitting material layer facing the light-absorbing layer and the light-emitting device, since the light-transmitting material is semi-solid, under the uniform pressure of the second carrier film, it can be pressed more easily and uniformly into the recess of the light-absorbing layer in the interval area. This allows a portion of the formed light-transmitting layer to be located in the interval area, and the light-transmitting layer located in the interval area to conform to the light-absorbing layer located in the interval area. The light-transmitting layer can fill the interval area, so that the display substrate can be planarized on the side of the light-emitting device away from the substrate.

[0123] As an alternative implementation, the hardness of the first carrier film is greater than the hardness of the light-absorbing material layer; the hardness of the transparent protective layer is greater than the hardness of the light-transmitting material layer.

[0124] In some embodiments of this disclosure, by making the hardness of the first carrier film greater than the hardness of the light-absorbing material layer, that is, by making the hardness of the first carrier film greater than the hardness of the light-absorbing material layer when it is in a semi-solid state, then during the pressing process of the first composite film, as... Figure 11 As shown, the first carrier film can transmit pressure more evenly, making the force on the light-absorbing material layer more balanced. The first carrier film with greater hardness can push the light-absorbing material layer to adhere to the substrate, so that the light-absorbing material layer fills all the gap areas. This allows the light-absorbing material layer to contact the light-emitting device and the substrate, and ensures that the light-absorbing layer is tightly bonded to the light-emitting device and the substrate, thereby improving the bonding strength between the light-absorbing layer and the light-emitting device, and between the light-absorbing layer and the substrate.

[0125] In some embodiments of this disclosure, by making the hardness of the transparent protective layer greater than the hardness of the light-transmitting material layer, that is, by making the hardness of the transparent protective layer greater than the hardness of the light-transmitting material layer when it is in a semi-solid state, then during the pressing process of the second composite film, such as Figure 12 As shown, the transparent protective layer can transmit pressure more evenly, ensuring more balanced stress across the light-transmitting material layer. Furthermore, the stronger transparent protective layer can push the light-transmitting material layer towards the substrate, filling uneven areas on the side of the light-absorbing layer away from the substrate—that is, filling the depressions in the light-absorbing layer within the spacing area. This also ensures a tight bond between the light-transmitting and light-absorbing layers. After the light-transmitting material layer cures to form the light-transmitting layer, it ensures strong adhesion between the light-transmitting and light-absorbing layers, and between the light-transmitting layer and the light-emitting device. Simultaneously, it ensures high flatness on the side of the light-transmitting layer away from the substrate and the side away from the light-emitting device, thereby improving the overall flatness of the display substrate.

[0126] As an optional implementation, the first carrier film is a release film, and / or the thickness difference of the first carrier film is less than or equal to 2.0 μm.

[0127] In some embodiments of this disclosure, by making the first carrier film a release film, the first carrier film can be easily and conveniently removed from the light-absorbing layer after the light-absorbing material layer is pressed and cured to form a light-absorbing layer.

[0128] In some embodiments of this disclosure, the thickness difference of the first carrier film is less than or equal to 2.0 μm, that is, the thickness of the first carrier film is relatively uniform. During the pressing process of the first composite film, the first composite film can be subjected to uniform force on its entire surface. That is, both the first carrier film and the light-absorbing material layer can be subjected to uniform force on their entire surface, making the force on the bottom light-absorbing material layer more balanced. The first carrier film can push the light-absorbing material layer to adhere to the substrate, and the light-absorbing material layer can be punctured by the light-emitting device. As the light-emitting device deforms, the thickness of the light-absorbing material layer around the light-emitting device will also be squeezed to be relatively uniform by the first carrier film, so that the light-absorbing layer is uniformly filled into the spacing area around the light-emitting device. This may avoid the phenomenon of uneven light output energy of the light-emitting device caused by the large thickness difference of the light-absorbing layer around the light-emitting device.

[0129] As an alternative implementation, the light-absorbing material layer is formed on the first carrier film using an adhesive film-forming process, and the thickness difference of the light-absorbing material layer is less than or equal to 2.0 μm.

[0130] In some embodiments of this disclosure, the light-absorbing material layer is formed on the first carrier film using an adhesive film-forming process. This ensures the uniformity of the light-absorbing material layer's thickness and the flatness after pressing, allowing the thickness difference of the light-absorbing material layer to be less than or equal to 2.0 μm. In other words, in its single-film state before pressing, the thickness difference between different locations of the light-absorbing material layer is less than or equal to 2.0 μm. This thickness difference range is used to control the thickness variation range of the light-absorbing material layer, ensuring its uniformity.

[0131] In related technologies, such as Figures 14 to 15 As shown, a method for packaging a display substrate may include the following steps:

[0132] A substrate is provided, on which multiple light-emitting devices are spaced apart, with spacer regions between the light-emitting devices;

[0133] A laminated film is provided, comprising a transparent protective layer, a transparent layer, and a black layer laminated on one side; and,

[0134] The lamination film is laminated onto the substrate and the light-emitting device with the black layer facing towards them.

[0135] That is, in such Figure 15In the encapsulation method shown, a one-time lamination molding method is used, that is, the black layer and the transparent layer in the lamination film are simultaneously laminated onto the substrate and the light-emitting device. During the lamination process, the black layer and the transparent layer are subjected to pressure as a whole. Since both the black layer and the transparent layer need to be uncured, both the black layer and the transparent layer are semi-cured, that is, both the black layer and the transparent layer are relatively soft. This can easily lead to the following two situations:

[0136] One situation is: such as Figure 15 As shown, during the lamination process, the black layer first contacts the light-emitting device. The black layer is subjected to the reaction force of the light-emitting device and squeezes the transparent layer in the corresponding area. While the black layer deforms with the light-emitting device layer, the transparent layer and the area corresponding to the light-emitting device also undergo a certain deformation. As the lamination continues, the flexibility of the transparent layer cannot generate a sufficiently uniform force on the black layer. Therefore, it is impossible to squeeze the black layer and the area corresponding to the light-emitting device from the side of the light-emitting device away from the substrate to the periphery of the light-emitting device. As a result, a thicker black layer remains on the side of the light-emitting device away from the substrate after lamination, and the side of the light-emitting device away from the substrate presents a basin-shaped arc. The black layer remaining on the side of the light-emitting device away from the substrate only affects the transmittance and light emission efficiency of the display substrate, and has a relatively small impact on the uniformity of light emission.

[0137] Another scenario involves the black layer initially contacting the light-emitting device during lamination. The black layer, subjected to the reaction force of the light-emitting device, compresses the corresponding transparent layer. As the black layer deforms along with the light-emitting device layer, the area of ​​the transparent layer corresponding to the light-emitting device also undergoes deformation. With further lamination, the flexibility of the transparent layer cannot generate a sufficiently uniform force on the black layer. Therefore, it cannot uniformly extrude the black layer and the area corresponding to the light-emitting device from the side of the light-emitting device furthest from the substrate towards the periphery of the device. This results in uneven deformation of the black layer, leading to significant differences in the thickness of the black layer within the gap formed by the light-emitting device after lamination. For example, for a particular light-emitting device, one side may have a thicker black layer and a thinner transparent layer, while the other side may have a thinner black layer and a thicker transparent layer. This will cause significant differences in the light extraction efficiency on both sides of the light-emitting device due to the influence of the black layer, thus affecting the uniformity of light extraction from the display substrate.

[0138] With Figure 14 Compared with the packaging method of the display substrate shown, the packaging method of the display substrate proposed in this embodiment can make the thickness of the light-absorbing layer in the interval area and the thickness of the light-absorbing layer between the interval areas more uniform by separately pressing the light-absorbing layer, which can improve the uniformity of ink color and light emission of the display substrate to a certain extent.

[0139] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0140] In the description of this disclosure, it should be understood that the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0141] Furthermore, the use of terms such as "first" and "second" in this disclosure is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.

[0142] Although embodiments of the present disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A display substrate, characterized in that, The display substrate includes: Base, Multiple light-emitting devices are spaced apart on the substrate, with gaps between adjacent light-emitting devices; A light-absorbing layer, wherein the light-absorbing layer is at least located within the interval region; A light-transmitting layer, the light-transmitting layer being continuously disposed on the side of the light-absorbing layer away from the substrate and on the side of the light-emitting device away from the substrate; and, A transparent protective layer is disposed on the side of the light-transmitting layer away from the light-absorbing layer; The plurality of light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device. The interval between the first light-emitting device and the second light-emitting device is smaller than the interval between the second light-emitting device and the third light-emitting device. The difference between the minimum thickness of the light-absorbing layer in the interval region between the first light-emitting device and the second light-emitting device and the minimum thickness of the light-absorbing layer in the interval region between the second light-emitting device and the third light-emitting device is less than or equal to 2.0 μm.

2. The display substrate as described in claim 1, characterized in that, The thickness of the light-absorbing layer located within the interval region is negatively correlated with the distance between the location of the light-absorbing layer and the light-emitting device closest to the location of the light-absorbing layer.

3. The display substrate as described in claim 2, characterized in that, A portion of the light-transmitting layer is located within the interval region, and the light-transmitting layer located within the interval region is conformal to the light-absorbing layer located within the interval region; The surface of the light-transmitting layer located within the interval region facing the substrate is an arc-shaped surface that convexes towards the substrate.

4. The display substrate as described in claim 1, characterized in that, The plurality of light-emitting devices form a plurality of light-emitting device groups, and each light-emitting device group includes at least two light-emitting devices; The spacing between adjacent light-emitting devices within each group of light-emitting devices is smaller than the spacing between adjacent light-emitting devices in adjacent groups of light-emitting devices; Wherein, the first light-emitting device and the second light-emitting device are located in the same group of light-emitting devices, and the second light-emitting device and the third light-emitting device are adjacent light-emitting devices between adjacent groups of light-emitting devices.

5. The display substrate as described in claim 4, characterized in that, The spacing K1 between adjacent light-emitting devices in adjacent light-emitting device groups and the maximum spacing K2 between light-emitting devices in each light-emitting device group satisfy the following: K1 / K2 is greater than or equal to 2, and / or the spacing between adjacent light-emitting devices within the light-emitting device group is in the range of 60μm to 100μm.

6. The display substrate as described in claim 4, characterized in that, Each of the light-emitting device groups constitutes a pixel of the display substrate; Each of the light-emitting device groups includes three light-emitting devices, and each light-emitting device in the same light-emitting device group emits a different color.

7. The display substrate as described in claim 1, characterized in that, The minimum thickness of the light-absorbing layer in the interval region is less than the first height and greater than or equal to two-thirds of the first height, where the first height is the distance between the side of the light-emitting device away from the substrate and the substrate.

8. The display substrate as described in claim 1, characterized in that, In the interval region, the total thickness of the light-transmitting layer and the light-absorbing layer is greater than the first height, where the first height is the distance between the side of the light-emitting device away from the substrate and the substrate; The surface of the light-transmitting layer on the side away from the substrate extends parallel to the substrate.

9. The display substrate as described in claim 1, characterized in that, The light-absorbing layer within the interval region is continuously distributed between adjacent light-emitting devices, and the light-absorbing layer is in contact with both the light-emitting device and the substrate.

10. The display substrate according to any one of claims 1 to 9, characterized in that, The surface of the light-emitting device on the side away from the substrate does not have the light-absorbing layer material, or... The surface of the light-emitting device on the side away from the substrate is not completely covered by the light-absorbing layer.

11. The display substrate according to any one of claims 1 to 9, characterized in that, A portion of the light-absorbing layer is located on the surface of the light-emitting device away from the substrate, and the maximum thickness of the light-absorbing layer on the surface of the light-emitting device away from the substrate is less than or equal to 2.0 μm.

12. The display substrate as claimed in claim 11, characterized in that, The minimum thickness of the light-absorbing layer within the interval region is in the range of 40 μm to 120 μm.

13. The display substrate as claimed in claim 11, characterized in that, The surface of the light-emitting device on the side away from the substrate is not completely covered by the light-absorbing layer.

14. The display substrate according to any one of claims 1 to 9, characterized in that, The transmittance of the light-absorbing layer is less than or equal to 30%, and / or the transmittance of the light-transmitting layer and the transparent protective layer is greater than or equal to 85%.

15. The display substrate according to any one of claims 1 to 9, characterized in that, The minimum thickness of the light-absorbing layer within the interval region is in the range of 40 μm to 120 μm, and the thickness of the light-transmitting layer located on the side of the light-emitting device away from the substrate surface is greater than 20 μm.

16. The display substrate according to any one of claims 1 to 9, characterized in that, The material of the light-absorbing layer includes at least one of acrylic resin and epoxy resin, the material of the light-transmitting layer includes at least one of acrylic resin and epoxy resin, and the material of the transparent protective layer includes at least one of polyethylene terephthalate and polycarbonate.

17. The display substrate according to any one of claims 1 to 9, characterized in that, Both the light-absorbing layer and the light-transmitting layer are elastic.

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