Display module and manufacturing method therefor, and electronic device

Abstract

The present disclosure provides a display module and a manufacturing method therefor, and an electronic device. The display module comprises: a base substrate and a light-emitting structure layer arranged on one side of the base substrate. The light-emitting structure layer is provided with a plurality of transparent areas and a plurality of light-emitting areas. The light-emitting structure layer comprises: a plurality of light-emitting devices, which are arranged in the light-emitting areas and each comprise a first electrode, a light-emitting layer and a second electrode that are sequentially stacked; and an auxiliary electrode, which is electrically connected to the second electrode and is in contact with the second electrode, wherein the orthographic projection of the auxiliary electrode on the base substrate does not overlap with the transparent areas. The display module in the present disclosure improves the light transmittance of the transparent areas, thereby improving the transparency effect.

Description

Display module, manufacturing method thereof, and electronic device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display module, a preparation method thereof, and an electronic device. Background Art

[0002] For OLED (Organic Light-Emitting Diode) display devices, OLED pixels include a transparent area and a light-emitting area. The light-emitting area includes a driving circuit and a pixel light-emitting display area. The transparent area and the light-emitting area of ​​the OLED pixel are arranged regularly, resulting in a transparent grating structure when the OLED pixel emits light. When observed by the human eye, this grating structure will produce a diffraction effect, affecting the transparency of the display device in the transparent area. Summary of the Invention

[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and proposes a display module and a preparation method thereof and an electronic device, which improve the light transmittance of the transparent area and enhance the transparency effect.

[0004] To achieve the above objectives, according to one aspect of the present disclosure, a display module is provided, comprising: a base substrate, and a light-emitting structure layer disposed on one side of the base substrate, the light-emitting structure layer having a plurality of transparent areas and a plurality of light-emitting areas, the light-emitting structure layer comprising:

[0005] a plurality of light-emitting devices, each of which is disposed in the light-emitting region and includes a first electrode, a light-emitting layer, and a second electrode stacked in sequence;

[0006] An auxiliary electrode is electrically connected to the second electrode and the two are in contact with each other; wherein the orthographic projection of the auxiliary electrode on the base substrate does not overlap with the transparent area.

[0007] The auxiliary electrode is provided in at least one of the following ways:

[0008] The orthographic projection of the auxiliary electrode on the base substrate surrounds the transparent area;

[0009] The orthographic projection of the auxiliary electrode on the base substrate surrounds the light emitting area;

[0010] The orthographic projection of the auxiliary electrode on the base substrate surrounds the orthographic projection of the pixel opening corresponding to the light-emitting device on the base substrate.

[0011] The auxiliary electrode includes at least one annular structure, and at least one of the orthographic projection of the pixel opening corresponding to the light-emitting device on the base substrate, the transparent area or the light-emitting area is located inside the orthographic projection of the annular structure on the base substrate.

[0012] In which, the light-emitting structure layer also includes a second electrode layer, each of the second electrodes is located in the second electrode layer, and the orthographic projection of the second electrode layer on the base substrate does not overlap with the transparent area; and / or the light-emitting structure layer also includes a light-emitting material layer, each of the light-emitting layers is located in the light-emitting material layer, and the orthographic projection of the light-emitting material layer on the base substrate does not overlap with the transparent area.

[0013] The light-emitting structure layer includes a pixel defining layer, the pixel defining layer having a plurality of light-transmitting openings and a plurality of pixel openings; the orthographic projections of the light-transmitting openings on the base substrate cover the transparent area, and the pixel openings are located in the light-emitting area;

[0014] The auxiliary electrode is located in the light-transmitting opening, or is arranged on a side of the pixel defining layer away from the base substrate.

[0015] Among them, the light-emitting structure layer also includes a first encapsulation layer, which is located on the side of the pixel defining layer away from the base substrate, and the light-emitting device and the pixel defining layer are located between the base substrate and the first encapsulation layer, and the light-transmitting opening is filled with the first encapsulation layer.

[0016] Wherein, the light transmittance of the first encapsulation layer is greater than 98%.

[0017] The display module further includes a second encapsulation layer, which is located in the transparent area and between the first encapsulation layer and the light-emitting device.

[0018] The auxiliary electrode is arranged on a side of the second electrode layer where the second electrode is located and close to the base substrate.

[0019] In which, the auxiliary electrode includes a first sub-electrode, a second sub-electrode and a third sub-electrode stacked in sequence in a direction away from the base substrate, wherein the orthographic projections of the first sub-electrode and the third sub-electrode on the base substrate cover the orthographic projection of the second sub-electrode on the base substrate.

[0020] According to another aspect of the present disclosure, a method for preparing a display module is provided, comprising:

[0021] forming a base substrate;

[0022] A light-emitting structure layer is formed on one side of the base substrate, wherein the light-emitting structure layer has multiple transparent areas and multiple light-emitting areas, the light-emitting structure layer includes multiple light-emitting devices and auxiliary electrodes, the light-emitting devices include a first electrode, a light-emitting layer, and a second electrode stacked in sequence, and are arranged in the light-emitting area; the auxiliary electrode is electrically connected to the second electrode, and the two are in contact; wherein the orthographic projection of the auxiliary electrode on the base substrate does not overlap with the transparent area.

[0023] Wherein, the step of forming a light emitting structure layer on one side of the base substrate includes:

[0024] forming a plurality of first electrodes spaced apart from each other on the base substrate;

[0025] A pixel defining layer is formed on one side of the base substrate; wherein the pixel defining layer has a plurality of light-transmitting openings and a plurality of pixel openings, and an orthographic projection of the first electrode on the base substrate overlaps with an orthographic projection of the pixel opening of the pixel defining layer on the base substrate;

[0026] An auxiliary electrode is formed in the light-transmitting opening or on the pixel defining layer, wherein the auxiliary electrode is arranged in at least one of the following ways:

[0027] The orthographic projection of the auxiliary electrode on the base substrate surrounds the transparent area;

[0028] The orthographic projection of the auxiliary electrode on the base substrate surrounds the light emitting area;

[0029] The orthographic projection of the auxiliary electrode on the base substrate surrounds the orthographic projection of the pixel opening of the light-emitting device on the base substrate;

[0030] A light-emitting layer and a second electrode of the light-emitting device are formed in the pixel opening, wherein an orthographic projection of the second electrode layer where the first electrode and the second electrode are located onto the base substrate does not overlap with the transparent area.

[0031] In the step of forming the light-emitting layer and the second electrode of the light-emitting device in the pixel opening, the light-emitting layer and the second electrode of the light-emitting device are formed by a single patterning process, wherein in the patterning process, the light-emitting material layer and the second electrode forming layer formed in the light-transmitting opening are removed.

[0032] Wherein, after the step of forming the light-emitting layer and the second electrode of the light-emitting device in the pixel opening, the method further includes:

[0033] A first encapsulation layer is formed on the pixel defining layer, wherein the light emitting device is located between the base substrate and the first encapsulation layer, and the light-transmitting opening is filled with the first encapsulation layer.

[0034] Wherein, after the step of forming the light-emitting device in the pixel opening, the method further includes:

[0035] A second encapsulation layer is formed on the pixel defining layer, wherein the second encapsulation layer is located in the transparent area and between the first encapsulation layer and the light emitting device.

[0036] A second encapsulation layer is formed on the light emitting device.

[0037] According to another aspect of the present disclosure, an electronic device is provided, which includes the above-mentioned display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0039] FIG1 is a schematic diagram showing the positional relationship between the auxiliary electrode and the transparent area in a display module in one example;

[0040] FIG2 is a schematic diagram showing the layer structure distribution in the transparent area and the light-emitting area of ​​the display module in FIG1 ;

[0041] FIG3 is a schematic diagram showing the positional relationship between the auxiliary electrode and the transparent area of ​​the display module in one embodiment of the present disclosure;

[0042] FIG4 is a schematic diagram showing the layer structure distribution in the transparent area and the light-emitting area of ​​the display module in FIG3 ;

[0043] FIG5 is a schematic diagram showing the distribution of layer structures in the transparent area and the light-emitting area of ​​a display module in another embodiment of the present disclosure;

[0044] FIG6 is a schematic diagram showing the positional relationship between the auxiliary electrode and the transparent area in another embodiment of the present disclosure;

[0045] FIG. 7 is a schematic diagram showing the positional relationship between the auxiliary electrode and the transparent area in another embodiment of the present disclosure.

[0046] 10. Base substrate; 20. Transparent area; 30. Light-emitting area; 40. Light-emitting device; 41. First electrode; 42. Light-emitting layer; 43. Second electrode; 50. Auxiliary electrode; 51. First sub-electrode; 52. Second sub-electrode; 53. Third sub-electrode; 60. Pixel defining layer; 61. Light-transmitting opening; 62. Pixel opening; 70. First encapsulation layer; 80. Second encapsulation layer; 90. Cover plate. DETAILED DESCRIPTION

[0047] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0048] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0049] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0050] As used herein, "parallel" and "perpendicular" include the conditions described and conditions similar to the conditions described, and the range of the similar conditions is within an acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°.

[0051] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0052] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0053] Figure 1 is a schematic diagram illustrating the positional relationship between the auxiliary electrode and the transparent region of a display module in one example. Figure 2 is a schematic diagram illustrating the layer structure distribution within the transparent region and the luminescent region of the display module in Figure 1. Figure 1 shows that the auxiliary electrode occupies space within transparent region 20, partially blocking light and affecting the transmittance of transparent region 20. Figure 2 also shows that the second electrode layer and the luminescent layer located within the transparent region absorb light, reducing the transmittance of transparent region 20.

[0054] Figure 3 shows a schematic structural diagram of a display module in one embodiment of the present disclosure. As can be seen from Figure 3, the display module includes a base substrate 10 and a light-emitting structure layer disposed on one side of the base substrate 10. The light-emitting structure layer has multiple transparent areas 20 and multiple light-emitting areas 30. The transparent areas 20 and light-emitting areas 30 are provided on the light-emitting structure layer, allowing the display module to have both display and light-transmitting functions.

[0055] In the specific embodiment shown in FIG4 , the light-emitting structure layer includes a plurality of light-emitting devices 40 and an auxiliary electrode 50 . The light-emitting devices 40 are disposed within the light-emitting region 30 and include a first electrode 41, a light-emitting layer 42, and a second electrode 43 stacked in sequence. When power is applied to the first and second electrodes 41, 43, the light-emitting layer 42 is excited to emit light, thereby achieving a display function. The second electrode 43 includes at least one of a transparent electrode and a semi-transmissive and semi-reflective electrode.

[0056] As shown in FIG4 , the auxiliary electrode 50 is electrically connected to the second electrode 43 and in contact with the second electrode 43, thereby reducing electrical resistance. The orthographic projection of the auxiliary electrode 50 on the base substrate 10 does not overlap with the transparent region 20. This arrangement prevents the auxiliary electrode 50 from blocking light within the transparent region 20, effectively improving the light transmittance of the transparent region 20.

[0057] In some optional embodiments, the orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the transparent area 20. This configuration can prevent the auxiliary electrode 50 from blocking light in the transparent area 20, thereby improving the light transmittance in the transparent area 20. The orthographic projection ring of the auxiliary electrode 50 on the base substrate 10 can surround only one transparent area 20 or multiple transparent areas 20 at the same time, which is not specifically limited here.

[0058] It should be noted that the orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounding the transparent area 20 includes at least one of the following two situations:

[0059] The first case is that the orthographic projection of the auxiliary electrode 50 on the base substrate 10 extends a preset length around the circumference of the transparent area 20 and does not form a closed loop structure. For example, the orthographic projection of the auxiliary electrode 50 on the base substrate 10 includes a long strip structure, a block structure, and an arc structure arranged on one side of the transparent area 20.

[0060] In the second case, the auxiliary electrode 50 includes at least one annular structure, and the transparent region 20 is located inside the orthographic projection of the annular structure on the base substrate 10 (see Figure 3). In this embodiment, the annular structure blocks the transparent region 20 from the light-emitting region 30, facilitating the removal of structures such as the second electrode layer and the light-emitting material layer formed within the transparent region 20 without affecting the light-emitting region 30 or the aperture ratio of the light-emitting region 30. This further improves the light transmittance of the transparent region 20 while ensuring the display effect.

[0061] The auxiliary electrode 50 may include only one annular structure or multiple annular structures. The multiple annular structures may be spaced apart, or at least two annular structures may be connected together, or multiple annular structures may be nested, preferably two to three annular structures may be nested.

[0062] The auxiliary electrode 50 may also include a combination of an annular structure and an arcuate structure. For example, the transparent region 20 is located inside the orthographic projection of the annular structure on the substrate 10, and the arcuate structure is located outside or inside the annular structure and extends along the circumference of the annular structure. Alternatively, the auxiliary electrode 50 may include multiple nested annular structures, with one annular structure remaining intact while the others are interrupted.

[0063] When the auxiliary electrode 50 includes a strip structure, an arc structure, or a ring structure, the overlapping area between the second electrode 43 and the auxiliary electrode 50 is larger, the overlapping effect is better, and the voltage drop is reduced.

[0064] In other optional embodiments, the orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the light-emitting area 30. This configuration prevents the auxiliary electrode 50 from blocking the light emitted by the light-emitting device 40 in the light-emitting area 30, thereby ensuring the display effect of the display module. The orthographic projection ring of the auxiliary electrode 50 on the base substrate 10 can surround only one light-emitting area 30 or multiple light-emitting areas 30 at the same time, and there is no specific limitation here.

[0065] It should be noted that the orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the light emitting area 30 in at least one of the following two situations:

[0066] The first case is that the orthographic projection of the auxiliary electrode 50 on the base substrate 10 extends a preset length around the circumference of the light-emitting area 30 and does not form a closed loop structure. For example, the orthographic projection of the auxiliary electrode 50 on the base substrate 10 includes a long strip structure, a block structure, and an arc structure arranged on one side of the light-emitting area 30.

[0067] In the second case, the auxiliary electrode 50 includes at least one annular structure, and the light-emitting region 30 is located inside the orthographic projection of the annular structure on the base substrate 10 (see Figure 6 ). In this embodiment, the annular structure blocks the transparent region 20 and the light-emitting region 30, facilitating the removal of structures such as the second electrode layer and the light-emitting material layer formed in the transparent region 20 without affecting the light-emitting region 30 or the aperture ratio of the light-emitting region 30. This further improves the light transmittance of the transparent region 20 while maintaining the display effect.

[0068] In other optional embodiments, the orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the orthographic projection of the pixel opening 62 corresponding to the light-emitting device 40 on the base substrate 10. This configuration can prevent the auxiliary electrode 50 from blocking the light emitted by the light-emitting device 40 in the light-emitting area 30, thereby ensuring the display effect of the display module. The orthographic projection of the auxiliary electrode 50 on the base substrate 10 can surround the orthographic projection of the pixel opening 62 corresponding to one light-emitting device 40 on the base substrate 10, or it can surround the orthographic projection of the pixel openings 62 corresponding to multiple light-emitting devices 40 on the base substrate 10. There is no specific limitation here, and it is only necessary to ensure that the orthographic projection of the auxiliary electrode 50 on the base substrate 10 does not overlap with the transparent area 20.

[0069] It should be noted that the orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the orthographic projection of the pixel opening 62 corresponding to the light-emitting device 40 on the base substrate 10, which includes at least one of the following two situations:

[0070] The first case is that the orthographic projection of the auxiliary electrode 50 on the base substrate 10 extends a preset length around the circumference of the orthographic projection of the pixel opening 62 corresponding to the light-emitting device 40 on the base substrate 10 and does not form a closed loop structure. For example, the auxiliary electrode 50 includes a long strip structure, a block structure, or an arc structure arranged on one side of the orthographic projection of the pixel opening 62 corresponding to the light-emitting device 40 on the base substrate 10.

[0071] The second case is that the auxiliary electrode 50 includes at least one annular structure, and the orthographic projection of the pixel opening 62 on the base substrate 10 is located inside the orthographic projection of the annular structure on the base substrate 10 , see FIG. 7 .

[0072] In the second case, one pixel opening 62 may correspond to one annular structure, or the orthographic projections of multiple pixel openings 62 on the base substrate 10 may be located inside the orthographic projection of the same annular structure on the base substrate 10. No specific limitation is made here.

[0073] Preferably, the orthographic projections of the plurality of pixel openings 62 on the base substrate 10 are located inside the orthographic projection of the same annular structure on the base substrate 10 , and the auxiliary electrode 50 is blocked between the transparent area 20 and the light-emitting area 30 .

[0074] In some optional embodiments, the light-emitting structure layer further includes a second electrode layer. Each second electrode 43 is located within the second electrode layer, and the orthographic projection of the second electrode layer on the base substrate 10 does not overlap with the transparent region 20 (see Figures 4 and 5). This arrangement prevents the second electrode layer from blocking light within the transparent region 20, further increasing the light transmittance of the transparent region 20 and effectively improving the light transmission effect of the display module.

[0075] In some optional embodiments, the light-emitting structure layer further includes a light-emitting material layer. Each light-emitting layer 42 is located within the light-emitting material layer, and the orthographic projection of the light-emitting material layer on the base substrate 10 does not overlap with the transparent region 20. See Figures 4 and 5. This arrangement prevents the layer containing the light-emitting layer 42 from blocking light within the transparent region 20, further increasing the light transmittance of the transparent region 20 and effectively enhancing the light transmission effect of the display module.

[0076] In the specific embodiment shown in FIG4 , the light-emitting structure layer includes a pixel-defining layer 60. The first electrode 41 of the light-emitting device 40 is located on the side of the pixel-defining layer 60 closest to the base substrate 10. The light-emitting layer 42 of the light-emitting device 40 is located on the side of the first electrode 41 away from the base substrate 10. The second electrode 43 of the light-emitting device 40 is located on the side of the light-emitting layer 42 away from the first electrode 41. The pixel-defining layer 60 has a plurality of light-transmitting openings 61 and a plurality of pixel openings 62. The orthographic projections of the light-transmitting openings 61 on the base substrate 10 cover the transparent area 20. The pixel openings 62 are located in the light-emitting area 30, and the plurality of pixel openings 62 correspond one-to-one to the plurality of light-emitting devices 40. The auxiliary electrode 50 is located within the light-transmitting openings 61. Placing the auxiliary electrode 50 within the light-transmitting openings 61 prevents the auxiliary electrode 50 from overlapping the side of the pixel-defining layer 60 away from the base substrate 10, thereby reducing the thickness of the display module and thereby contributing to a thinner and lighter display module.

[0077] In other optional embodiments, referring to FIG5 , the auxiliary electrode 50 is disposed on a side of the pixel defining layer 60 away from the base substrate 10. This arrangement can reduce the space occupied by the auxiliary electrode 50 within the light-transmitting opening 61, thereby increasing the area of ​​the transparent region 20 without increasing the opening area of ​​the light-transmitting opening 61, thereby further improving the light transmittance of the transparent region 20.

[0078] Optionally, the material of the auxiliary electrode includes any one of molybdenum niobium, copper, indium tin oxide, or a titanium / aluminum / titanium composite material.

[0079] In some embodiments, referring to Figures 4 and 5 , the light-emitting structure layer further includes a first encapsulation layer 70. The first encapsulation layer 70 is located on a side of the pixel-defining layer 60 away from the base substrate 10, and the light-emitting device 40 and the pixel-defining layer 60 are located between the base substrate 10 and the first encapsulation layer 70. The light-transmitting opening 61 is filled with the first encapsulation layer 70. The first encapsulation layer 70 covers the pixel-defining layer 60 and the light-emitting device 40 to seal the light-emitting device 40, thereby reducing or preventing degradation of the light-emitting device 40 caused by moisture and / or oxygen in the environment and improving the service life of the light-emitting device 40. The first encapsulation layer 70 is directly filled in the light-transmitting opening 61, and there is no other structure to block or absorb light from the transparent area 20, further improving the light transmittance of the transparent area 20 and enhancing the display effect of the display module.

[0080] Optionally, the first encapsulation layer 70 is a light-transmitting layer, and the light transmittance of the first encapsulation layer 70 is greater than 98%.

[0081] Preferably, the first encapsulation layer 70 is a transparent layer.

[0082] Optionally, the transmittance of the transparent area 20 to light of 550 nm is greater than or equal to 98%, which effectively improves the overall transparency of the transparent display module and optimizes the display effect.

[0083] The first encapsulation layer 70 may be a single-layer structure or a multi-layer structure, wherein the multi-layer structure includes a stacked structure of an inorganic layer and an organic layer.

[0084] In the specific embodiment shown in Figures 4 and 5, the display module further includes a second encapsulation layer 80, which is located within the transparent region 20 and between the first encapsulation layer 70 and the light-emitting device 40. By providing the second encapsulation layer 80 between the first encapsulation layer 70 and the light-emitting device 40, the sealing effect of the light-emitting device 40 can be further improved, thereby improving the protection effect of the light-emitting device 40.

[0085] Optionally, the second encapsulation layer 80 is an inorganic encapsulation layer.

[0086] In some optional embodiments, the auxiliary electrode 50 is disposed on a side of the second electrode layer where the second electrode 43 is located that is close to the base substrate 10. That is, the auxiliary electrode 50 is formed before the second electrode 43 so that when the second electrode layer is formed, the second electrode 43 overlaps with the auxiliary electrode 50, which is beneficial for reducing voltage drop. At the same time, the provision of the auxiliary electrode 50 isolates the second electrode layer in the transparent area 20 from the second electrode layer in the light-emitting device 40, which is beneficial for removing the second electrode layer in the transparent area 20 to ensure the light transmittance of the transparent area 20.

[0087] In the specific embodiment shown in Figures 4 and 5, the auxiliary electrode 50 includes a first sub-electrode 51, a second sub-electrode 52, and a third sub-electrode 53 stacked in sequence in a direction away from the base substrate 10. The orthographic projections of the first sub-electrode 51 and the third sub-electrode 53 on the base substrate 10 overlap the orthographic projection of the second sub-electrode 52 on the base substrate 10. Due to the step difference between the second sub-electrode 52 and the third sub-electrode 53, the second electrode layer is disconnected at the location of the auxiliary electrode 50, thereby separating the second electrode layer in the transparent region 20 from the second electrode layer in the light-emitting device 40, facilitating the removal of the second electrode layer in the transparent region 20.

[0088] It should be noted that, in the present application, the auxiliary electrode 50 may be an integrated structure or a split structure, for example, it may be formed by a plurality of independent annular structures, and no specific limitation is made here.

[0089] In some optional embodiments, the display module further includes a cover plate 90 , which is disposed on a side of the first encapsulation layer 70 away from the base substrate 10 .

[0090] As another aspect of the present disclosure, an electronic device is provided, which includes the display module of the above embodiment. The electronic device can be a product or component with a display function, such as a mobile phone, a television, a monitor, a tablet computer, a navigator, etc., and the electronic device can display transparently.

[0091] As another aspect of the present disclosure, a method for preparing a display module is provided, which includes the following steps S10 to S20.

[0092] Step S10: Forming a base substrate 10. Base substrate 10 has a pixel driving circuit thereon to drive each light-emitting device. Base substrate 10 may be a flexible substrate made of an organic material such as polyimide (PI), or a glass substrate. The pixel driving circuit may include multiple thin-film transistors, such as LTPS (Low Temperature Poly-Silicon) transistors or LTPO (Low Temperature Polycrystalline Oxide) transistors.

[0093] Step S20: A light-emitting structure layer is formed on one side of the base substrate 10, wherein the light-emitting structure layer has multiple transparent areas 20 and multiple light-emitting areas 30. The light-emitting structure layer includes multiple light-emitting devices 40 and an auxiliary electrode 50. The light-emitting device 40 includes a first electrode 41, a light-emitting layer 42, and a second electrode 43 stacked in sequence and disposed within the light-emitting area 30. The auxiliary electrode 50 is electrically connected to the second electrode 43 and in contact with the second electrode 43. The orthographic projection of the auxiliary electrode 50 on the base substrate 10 does not overlap with the transparent area 20. In the above-mentioned preparation method, by forming the auxiliary electrode 50 at a position outside the transparent area 20, the shielding of the transparent area 20 by the auxiliary electrode 50 can be reduced, allowing light to pass through the transparent area 20 smoothly, thereby improving the light transmittance of the transparent area 20.

[0094] In some optional embodiments, step S20 includes steps S21 to S24.

[0095] Step S21 : forming a plurality of first electrodes 41 spaced apart from each other on the base substrate 10 . The first electrodes 41 are electrically connected to the pixel driving circuit on the base substrate 10 .

[0096] Step S22: A pixel-defining layer 60 is formed on one side of the base substrate 10. The pixel-defining layer 60 has a plurality of light-transmitting openings 61 and a plurality of pixel openings 62. The orthographic projection of the first electrode 41 on the base substrate 10 overlaps with the orthographic projection of the pixel openings 62 of the pixel-defining layer 60 on the base substrate 10. The orthographic projection of the first electrode 41 on the base substrate 10 does not overlap with the orthographic projection of the light-transmitting openings 61 on the base substrate 10, thereby preventing the first electrode 41 from blocking the transparent area 20 within the light-transmitting openings 61, thereby improving the light transmittance of the transparent area 20.

[0097] Step S23: forming an auxiliary electrode 50 in the light-transmitting opening 61 or on the pixel-defining layer 60 , wherein the auxiliary electrode 50 is disposed in at least one of the following ways:

[0098] The orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the transparent area 20 ;

[0099] The orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the light emitting area 30 ;

[0100] The orthographic projection of the auxiliary electrode 50 on the base substrate 10 surrounds the orthographic projection of the pixel opening 62 of the light emitting device 40 on the base substrate 10 .

[0101] Preferably, the auxiliary electrode 50 includes at least one annular structure, the orthographic projection of the annular structure on the base substrate 10 surrounds at least one of the orthographic projection of the pixel opening 62 of the light-emitting device 40 on the base substrate 10 , the transparent area 20 and the light-emitting area 30 .

[0102] Step S24 : forming the light emitting layer 42 and the second electrode 43 of the light emitting device 40 in the pixel opening 62 , wherein the orthographic projection of the second electrode layer where the second electrode 43 is located onto the base substrate 10 does not overlap with the transparent area 20 .

[0103] In an optional embodiment, in step S24, the light-emitting layer 42 and the second electrode 43 of the light-emitting device 40 are formed using a single patterning process, wherein the light-emitting material layer and the second electrode-forming layer formed within the light-transmitting opening 61 are removed during the patterning process. For example, in the process of forming the light-emitting layer 42 and the second electrode 43 of the light-emitting device 40 within the pixel opening 62, the light-emitting material layer and the second electrode-forming layer can be formed on the pixel-defining layer 60. In this process, the light-emitting material layer and the second electrode-forming layer are not only deposited on the first electrode 41, the pixel-defining layer 60, and the auxiliary electrode 50, but also deposited within the light-transmitting opening 61. The light-emitting material layer and the second electrode-forming layer within the light-transmitting opening 61 are then removed using a single patterning process, while retaining the light-emitting layer 42 and the second electrode 43 within the pixel opening 62. In this process, the auxiliary electrode 50 at least blocks the light-emitting device 40 adjacent to the transparent region 20, thereby preventing the stripping liquid from flowing from the transparent region 20 into the light-emitting device 40.

[0104] The second electrode forming layer is used to form a second electrode layer.

[0105] For example, the auxiliary electrode 50 may include at least one annular structure that blocks the transparent region 20 and the light-emitting device 40 adjacent to the transparent region 20 , or isolates the transparent region 20 so that the stripping liquid does not flow from the transparent region 20 into the light-emitting device 40 .

[0106] Specifically, the transparent area 20 may be located inside the orthographic projection of the annular structure on the base substrate 10. This means that the annular structure surrounds the outer periphery of the transparent area 20 to isolate the transparent area 20. A single annular structure may be used to isolate multiple transparent areas 20, or multiple annular structures may be used to isolate multiple transparent areas 20, without specific limitation herein.

[0107] Alternatively, the light-emitting area 30 may be located inside the orthographic projection of the annular structure on the base substrate 10. This can be understood as the annular structure being disposed around the outer periphery of the light-emitting area 30, isolating the light-emitting area 30 and thereby blocking the stripping liquid from flowing from the transparent area 20 into the light-emitting device 40. A single annular structure may be used to isolate multiple light-emitting areas 30, or multiple annular structures may be used to isolate multiple light-emitting areas 30.

[0108] It can also be that the orthographic projections of the pixel openings 62 corresponding to all light-emitting devices 40 on the base substrate 10 are all located on the inner side of the orthographic projection of the ring structure on the base substrate 10. It can be understood that all light-emitting devices 40 are isolated by the ring structure, and can be isolated by one ring structure or multiple ring structures.

[0109] Of course, when a plurality of transparent areas 20 are arranged in a row or in a column, the auxiliary electrode 50 may also include an isolation strip structure, and the two ends of the isolation strip structure extend to the two ends of the display module. There is no specific limitation on the specific structure of the auxiliary electrode 50, and it is only necessary to ensure that the auxiliary electrode 50 can block the stripping liquid from flowing from the transparent area 20 into the light-emitting device 40. In some optional embodiments, after step S24, it also includes: forming a first encapsulation layer 70 on the pixel defining layer 60, wherein the light-emitting device 40 is located between the base substrate 10 and the first encapsulation layer 70, and the light-transmitting opening 61 is filled with the first encapsulation layer 70. The first encapsulation layer 70 is directly filled in the light-transmitting opening 61. The first encapsulation layer 70 is a light-transmitting layer, which reduces the absorption and shielding of light by other layer structures, and is conducive to improving the light transmittance of the display module.

[0110] In some optional embodiments, after step S24, the process further includes forming a second encapsulation layer 80 on the pixel defining layer 60, wherein the second encapsulation layer 80 is located within the transparent region 20 and between the first encapsulation layer 70 and the light-emitting device 40. The double-layer encapsulation effect of the first encapsulation layer 70 and the second encapsulation layer 80 effectively reduces the corrosion of the light-emitting device 40 by water and oxygen, thereby improving the protection of the light-emitting device 40.

[0111] In some optional embodiments, the light emitting layer 42, the second electrode 43, and the second encapsulation layer 80 of the light emitting device 40 are formed by a single patterning process. In the single patterning process, the second encapsulation layer 80 can reduce the corrosion of the light emitting device 40 by water and oxygen.

[0112] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display module, wherein, Comprising: A substrate substrate, and a light-emitting structure layer disposed on one side of the substrate substrate, the light-emitting structure layer having a plurality of transparent regions and a plurality of light-emitting regions, the light-emitting structure layer comprising: A plurality of light-emitting devices, the light-emitting devices being disposed in the light-emitting regions and comprising a first electrode, a light-emitting layer, and a second electrode stacked in sequence; An auxiliary electrode, the auxiliary electrode being electrically connected to and in contact with the second electrode; wherein, a positive projection of the auxiliary electrode on the substrate substrate does not overlap with the transparent region.

2. The display module according to claim 1, wherein, The auxiliary electrode is disposed in at least one of the following manners: A positive projection of the auxiliary electrode on the substrate substrate surrounds the transparent region; A positive projection of the auxiliary electrode on the substrate substrate surrounds the light-emitting region; A positive projection of the auxiliary electrode on the substrate substrate surrounds a positive projection of a pixel opening corresponding to the light-emitting device on the substrate substrate.

3. The display module according to claim 2, wherein, The auxiliary electrode includes at least one annular structure, and at least one of a positive projection of a pixel opening corresponding to the light-emitting device on the substrate substrate, the transparent region, or the light-emitting region is located inside a positive projection of the annular structure on the substrate substrate.

4. The display module according to claim 1, wherein, The light-emitting structure layer further includes a second electrode layer, each of the second electrodes is located in the second electrode layer, and a positive projection of the second electrode layer on the substrate substrate does not overlap with the transparent region; and / or The light-emitting structure layer further includes a light-emitting material layer, each of the light-emitting layers is located in the light-emitting material layer, and a positive projection of the light-emitting material layer on the substrate substrate does not overlap with the transparent region.

5. The display module according to any one of claims 1 to 4, wherein, The light-emitting structure layer includes a pixel defining layer, the pixel defining layer having a plurality of light-transmitting openings and a plurality of pixel openings; A positive projection of the light-transmitting opening on the substrate substrate covers the transparent region, and the pixel opening is located in the light-emitting region; The auxiliary electrode is located in the light-transmitting opening or disposed on a side of the pixel defining layer away from the substrate substrate.

6. The display module according to claim 5, wherein, The light-emitting structure layer further includes a first encapsulation layer, the first encapsulation layer being located on a side of the pixel defining layer away from the substrate substrate, and the light-emitting device and the pixel defining layer are located between the substrate substrate and the first encapsulation layer, and the light-transmitting opening is filled with the first encapsulation layer.

7. The display module according to claim 6, wherein, The light transmittance of the first encapsulation layer is greater than 98%.

8. The display module according to claim 6, wherein, The display module further includes a second encapsulation layer, the second encapsulation layer being located in the transparent region and between the first encapsulation layer and the light-emitting device.

9. The display module according to any one of claims 1 to 4, wherein, The auxiliary electrode is disposed on a side of the second electrode layer where the second electrode is located and close to the substrate substrate.

10. The display module according to any one of claims 1 to 4, wherein, The auxiliary electrode includes a first sub-electrode, a second sub-electrode, and a third sub-electrode stacked in sequence in a direction away from the substrate substrate, wherein positive projections of the first sub-electrode and the third sub-electrode on the substrate substrate cover a positive projection of the second sub-electrode on the substrate substrate.

11. A method for preparing a display module, wherein, Comprising: Forming a substrate substrate; A light-emitting structure layer is formed on one side of the substrate, wherein the light-emitting structure layer has a plurality of transparent regions and a plurality of light-emitting regions, the light-emitting structure layer includes a plurality of light-emitting devices and auxiliary electrodes, the light-emitting devices include a first electrode, a light-emitting layer and a second electrode stacked in sequence, and are disposed in the light-emitting regions; the auxiliary electrodes are electrically connected to and in contact with the second electrodes; wherein, the orthographic projection of the auxiliary electrodes on the substrate does not overlap with the transparent regions.

12. The method according to claim 11, wherein, The step of forming the light-emitting structure layer on one side of the substrate includes: Forming a plurality of the first electrodes spaced apart on the substrate; Forming a pixel defining layer on one side of the substrate; wherein, the pixel defining layer has a plurality of light-transmitting openings and a plurality of pixel openings, and the orthographic projection of the first electrode on the substrate overlaps with the orthographic projection of the pixel openings of the pixel defining layer on the substrate; Forming the auxiliary electrodes in the light-transmitting openings or on the pixel defining layer, wherein the setting manner of the auxiliary electrodes adopts at least one of the following: The orthographic projection of the auxiliary electrodes on the substrate surrounds the transparent regions; The orthographic projection of the auxiliary electrodes on the substrate surrounds the light-emitting regions; The orthographic projection of the auxiliary electrodes on the substrate surrounds the orthographic projection of the pixel openings of the light-emitting devices on the substrate; Forming the light-emitting layer and the second electrode of the light-emitting device in the pixel openings, wherein the orthographic projections of the second electrode layer where the first electrode and the second electrode are located on the substrate do not overlap with the transparent regions.

13. The method according to claim 12, wherein In the step of forming the light-emitting layer and the second electrode of the light-emitting device in the pixel openings, The light-emitting layer and the second electrode of the light-emitting device are formed by a single patterning process, wherein, in the patterning process, the light-emitting material layer and the second electrode forming layer formed in the light-transmitting openings are removed.

14. The method according to claim 12, wherein, After the step of forming the light-emitting layer and the second electrode of the light-emitting device in the pixel openings, further includes: Forming a first encapsulation layer on the pixel defining layer, wherein the light-emitting device is located between the substrate and the first encapsulation layer, and the light-transmitting openings are filled with the first encapsulation layer.

15. The method according to claim 14, wherein After the step of forming the light-emitting device in the pixel openings, further includes: Forming a second encapsulation layer on the pixel defining layer, wherein the second encapsulation layer is located in the transparent regions and between the first encapsulation layer and the light-emitting device; Forming a second encapsulation layer on the light-emitting device.

16. An electronic device, wherein, Including the display module according to any one of claims 1 to 10.

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