Display module, preparation method thereof and display device

Abstract

The invention provides a display module, a preparation method thereof and a display device. The display module comprises a substrate; the pixel defining layer is located on one side of the substrate, and a plurality of pixel openings are defined by the pixel defining layer; at least part of the light-emitting devices are located in the pixel openings; the cover plate is located on the side, away from the substrate, of the light-emitting device; the solar cell module comprises at least one cell unit, the cell unit is located in the cover plate, and the orthographic projection of the cell unit on the substrate is located in the orthographic projection range of the pixel defining layer on the substrate. The battery units are integrated in the cover plate, ambient light can enter the battery units after penetrating through part of the thickness of the cover plate, the utilization rate of the ambient light is high, and the generating capacity is high; moreover, the arrangement of the battery unit hardly affects the light emission of the light-emitting device, and the display effect of the display module is not affected.

Description

Technical Field

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

[0002] With the rapid development of electronic technology, people have put forward higher and higher requirements for the battery life of various portable electronic products and emergency power supply plans in the event of emergencies. As a renewable clean energy, solar energy is not only abundant in resources, but also free to develop and utilize, and does not pollute the environment, and does not require mining and transportation. It has huge application potential and development prospects. At present, photovoltaic solar charging has begun to be applied to display devices. However, due to the limitations of related technologies, display devices with photovoltaic solar charging functions still cannot meet the demand. Summary of the invention

[0003] In view of this, embodiments of the present application provide a display module, a method for preparing the same, and a display device.

[0004] In a first aspect, the present application provides a display module, comprising:

[0005] substrate;

[0006] A pixel defining layer is located on one side of the substrate, and the pixel defining layer encloses a plurality of pixel openings;

[0007] a plurality of light emitting devices, at least some of which are located in the pixel openings;

[0008] A cover plate, located on a side of the light emitting device away from the substrate;

[0009] The solar cell assembly comprises at least one battery unit, wherein the battery unit is located in a cover plate, and the orthographic projection of the battery unit on a substrate is located within the orthographic projection range of a pixel defining layer on the substrate.

[0010] In one embodiment, the cover plate includes a first sub-cover plate and a second sub-cover plate, the first sub-cover plate is located on a side of the second sub-cover plate close to the substrate, and the battery unit is located between the first sub-cover plate and the second sub-cover plate;

[0011] Preferably, the light transmittance of the battery cell is 40 to 90%;

[0012] Preferably, the battery cell comprises a first electrode layer, a functional layer and a second electrode layer which are stacked, and the first electrode layer is located on a side of the functional layer close to the first sub-cover plate;

[0013] Preferably, the first electrode layer and / or the second electrode layer are transparent;

[0014] Preferably, the material of the first electrode layer includes indium tin oxide and / or fluorine-doped tin oxide;

[0015] Preferably, the material of the second electrode layer includes indium tin oxide and / or fluorine-doped tin oxide;

[0016] Preferably, the material of the functional layer includes at least one of perovskite, copper-zinc-tin-sulfur-selenium and crystalline silicon;

[0017] Preferably, the second sub-cover plate comprises a first portion and a second portion, the second portion surrounds the first portion; in a direction close to the first sub-cover plate and in a direction parallel to the plane where the substrate is located, the second portion gradually moves away from the first portion;

[0018] Preferably, a side of the second portion close to the substrate is sealed and connected to the first sub-cover plate;

[0019] Preferably, the angle between the second portion and the direction perpendicular to the plane where the substrate is located is 30 to 60°;

[0020] Preferably, the display module further comprises: an anti-reflection film, located on a side of the second sub-cover plate facing away from the substrate;

[0021] Preferably, the second sub-cover plate has a thickness of 0.3-1 mm.

[0022] In one embodiment, the solar cell assembly includes a battery cell, and the solar cell assembly further includes a first current lead-out structure and a second current lead-out structure, the first current lead-out structure is electrically connected to the first electrode layer of the battery cell, and the second current lead-out structure is electrically connected to the second electrode layer of the battery cell; or,

[0023] The solar cell assembly includes a plurality of battery cells, the first current extraction structure is electrically connected to a first electrode layer of one battery cell, and the second current extraction structure is electrically connected to a second electrode layer of another battery cell;

[0024] Preferably, the display module includes a frame area; in the frame area, a through hole is provided in the first sub-cover plate, and the first current lead-out structure and the second current lead-out structure are respectively led out through the through hole;

[0025] Preferably, the display module further comprises a first shielding layer located in the frame area, and the through hole penetrates the first shielding layer;

[0026] The first shielding layer is located on a side of the first sub-cover plate close to the substrate; and / or the first shielding layer is located on a side of the first sub-cover plate close to the second sub-cover plate;

[0027] Preferably, the display module further comprises a second shielding layer located in the frame area;

[0028] The second shielding layer is located on a side of the second sub-cover plate close to the first sub-cover plate; and / or, the second shielding layer is located on a side of the second sub-cover plate away from the substrate;

[0029] Preferably, the display module further includes a display area, the frame area surrounds the display area, the through hole includes a first sub-through hole and a second sub-through hole, the first sub-through hole and the second sub-through hole are located on opposite sides of the display area, the first current lead-out structure is led out through the first sub-through hole, and the second current lead-out structure is led out through the second sub-through hole;

[0030] Preferably, the first current lead-out structure is sealed and connected to the first sub-through hole by a sealant; the second current lead-out structure is sealed and connected to the second sub-through hole by a sealant;

[0031] Preferably, the frame area includes two first sub-frame areas and two second sub-frame areas, the width of the first sub-frame area is greater than the width of the second sub-frame area, and the first sub-through hole and the second sub-through hole are both located in the first sub-frame area;

[0032] Preferably, the first current drawing structure comprises a wire, and / or the second current drawing structure comprises a wire.

[0033] In one embodiment, the number of the battery unit is 1, and in the display area of ​​the display module, the orthographic projection of the battery unit on the substrate overlaps with the orthographic projection of the pixel defining layer on the substrate;

[0034] Preferably, the orthographic projection of the battery unit on the substrate overlaps with the orthographic projection of a surface of the pixel defining layer facing away from the substrate on the substrate.

[0035] In one embodiment, there are multiple battery cells, and the multiple battery cells are connected in series;

[0036] Preferably, the battery cell comprises a first electrode layer, a functional layer and a second electrode layer which are stacked, and the first electrode layer is located on a side of the functional layer close to the substrate;

[0037] The solar cell assembly further includes: a conductive structure, wherein the first electrode layer of one battery cell and the second electrode layer of another battery cell in adjacent battery cells are electrically connected via the conductive structure;

[0038] Preferably, the orthographic projection of the conductive structure on the substrate is located within the orthographic projection range of the pixel defining layer on the substrate;

[0039] Preferably, the conductive structure comprises a conductive wire.

[0040] In one embodiment, it further comprises: an encapsulation layer, which is located between the light emitting device and the cover plate, and the orthographic projection of the encapsulation layer on the substrate covers the orthographic projection of the light emitting device and the pixel defining layer on the substrate;

[0041] Preferably, it also includes: an optical adhesive layer located between the cover plate and the packaging layer;

[0042] Preferably, the solar cell assembly encloses a plurality of openings, and the display module further comprises: a filling layer located in the openings;

[0043] Preferably, the transparency of the filling layer is greater than or equal to 90%.

[0044] A second aspect of the present application provides a method for preparing a display module, comprising:

[0045] A light-emitting device and a pixel defining layer are prepared on one side of the substrate, wherein the pixel defining layer encloses a plurality of pixel openings, and at least part of the light-emitting device is located in the pixel openings;

[0046] A cover plate and a solar cell assembly are prepared on the side of the light-emitting device away from the substrate. The solar cell assembly includes at least one battery cell. The battery cell is located in the cover plate, and the orthographic projection of the battery cell on the substrate is within the orthographic projection range of the pixel defining layer on the substrate.

[0047] In one embodiment, the step of preparing a cover plate and a solar cell assembly on a side of the light emitting device facing away from the substrate comprises:

[0048] preparing a solar cell assembly on one side of the first sub-cover;

[0049] The second sub-cover is buckled on the side of the solar cell assembly away from the first sub-cover to obtain a cover including the first sub-cover and the second sub-cover;

[0050] Fixing the cover plate and the solar cell assembly on the side of the light emitting device away from the substrate;

[0051] Preferably, the step of preparing a solar cell assembly on one side of the first sub-cover comprises:

[0052] A through hole is formed in the first sub-cover plate;

[0053] Sequentially preparing a first electrode layer, a functional layer, and a second electrode layer on one side of the first sub-cover plate to obtain at least one battery unit;

[0054] The first current lead-out structure is electrically connected to the first electrode layer of a battery cell and then led out from the through hole, and the second current lead-out structure is electrically connected to the second electrode layer of a battery cell and then led out from the through hole to obtain a solar cell module;

[0055] Preferably, the method of opening the through hole in the first sub-cover plate includes laser drilling and / or etching;

[0056] Preferably, the step of opening a through hole in the first sub-cover plate comprises: opening a through hole in the first sub-cover plate and the first shielding layer; the first shielding layer is located on a side of the first sub-cover plate close to the substrate; and / or the first shielding layer is located on a side of the first sub-cover plate close to the second sub-cover plate;

[0057] Preferably, after the step of fastening the second sub-cover plate on the side of the solar cell assembly facing away from the first sub-cover plate, the method further comprises:

[0058] Sealingly connecting the first sub-cover plate and the second sub-cover plate;

[0059] Preferably, the sealing connection between the first sub-cover plate and the second sub-cover plate includes gluing and / or laser sintering.

[0060] A third aspect of the present application provides a display device, comprising the aforementioned display module, or comprising a display module prepared by the aforementioned preparation method.

[0061] In one embodiment, it further includes:

[0062] The power storage component is located on the side of the substrate away from the pixel defining layer, and the power storage component is electrically connected to the solar cell component in the display module; the power storage component is used to store the electric energy generated by the solar cell component;

[0063] Preferably, the solar cell assembly comprises a first current lead-out structure and a second current lead-out structure, and the power storage assembly is electrically connected to the first current lead-out structure and the second current lead-out structure respectively;

[0064] Preferably, the power storage component is electrically connected to at least one light emitting device in the display module;

[0065] Preferably, the display device further comprises a main battery, which is located on the same side of the substrate as the power storage component, and the power storage component is electrically connected to the main battery;

[0066] The main battery is used to power the light-emitting device;

[0067] Preferably, the main battery is electrically connected to at least one light emitting device in the display module.

[0068] According to the display module provided in the embodiment of the present application, the battery unit is integrated in the cover plate, and the ambient light can be incident on the battery unit by passing through part of the thickness of the cover plate, so the utilization rate of the ambient light is high and the power generation is high; moreover, the setting of the battery unit will hardly affect the emission of light of the light-emitting device and will not affect the display effect of the display module; in addition, the ambient light is absorbed by the battery unit, which can reduce the reflection of the ambient light by the display module, which is beneficial to improving the display effect of the display module, and is beneficial to reducing the setting of the polarizer or color film layer, which can reduce the thickness of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 It is a schematic diagram of the cross-sectional structure of a display module in one embodiment of the present application.

[0070] Figure 2This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0071] Figure 3 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0072] Figure 4 Schematic diagram of the cross-sectional structure of the second sub-cover in one embodiment of the present application.

[0073] Figure 5 The figure is a schematic diagram of the top structure of the second sub-cover plate in one embodiment of the present application.

[0074] Figure 6 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0075] Figure 7 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0076] Figure 8 It is a schematic diagram of a top view of the structure of a display module in one embodiment of the present application.

[0077] Fig. 9 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0078] Fig.10 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0079] Fig.11 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0080] Fig.12 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0081] Fig.13 It is a schematic diagram of a top view structure of a pixel defining layer and a battery unit in one embodiment of the present application.

[0082] Fig.14 This is a schematic top view of the structure of a pixel defining layer and a battery unit in another embodiment of the present application.

[0083] Fig.15 This is a schematic diagram of the cross-sectional structure of a display module in another embodiment of the present application.

[0084] Fig.16 This is a random diagram showing the process flow of a method for preparing a module in one embodiment of the present application.

[0085] Figures 17 to 20 It is a schematic diagram of the preparation process of a display module in one embodiment of the present application.

[0086] Fig.21 It is a schematic diagram of the top view of the structure of a display device in one embodiment of the present application. DETAILED DESCRIPTION

[0087] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0088] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0089] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0090] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0091] The present application provides a display module according to a first aspect. Figure 1 The structural schematic diagram of the display module shown in the figure, the display module includes: a substrate 100; a pixel defining layer 200, located on one side of the substrate 100, the pixel defining layer 200 enclosing a plurality of pixel openings 210; a plurality of light-emitting devices 300, at least some of the light-emitting devices 300 are located in the pixel openings 210; a cover plate 400, located on the side of the light-emitting device 300 away from the substrate 100; a solar cell assembly 500, including at least one battery cell 510, the battery cell 510 is located in the cover plate 400, and the orthographic projection of the battery cell 510 on the substrate 100 is located within the orthographic projection range of the pixel defining layer 200 on the substrate 100.

[0092] According to the display module provided in the embodiment of the present application, the battery unit 510 is integrated in the cover plate 400, and the ambient light can be incident on the battery unit 510 by passing through part of the thickness of the cover plate 400, so the utilization rate of the ambient light is high and the power generation is high; moreover, the setting of the battery unit 510 will hardly affect the emission of light from the light-emitting device and will not affect the display effect of the display module; in addition, the ambient light is absorbed by the battery unit 510, which can reduce the reflection of the ambient light by the display module, which is beneficial to improving the display effect of the display module, and is beneficial to reducing the setting of the polarizer or color film layer, which can reduce the thickness of the display module.

[0093] In one embodiment, referring to Figure 2 In the structural schematic diagram of the display module shown, the cover plate 400 includes a first sub-cover plate 410 and a second sub-cover plate 420, the first sub-cover plate 410 is located on the side of the second sub-cover plate 420 close to the substrate 100, and the battery cell 510 is located between the first sub-cover plate 410 and the second sub-cover plate 420. Therefore, when preparing the battery cell 510, the first sub-cover plate 410 can be used as a substrate, and the second sub-cover plate 420 can be used as a packaging structure of the battery cell 510, and then the cover plate 400 and the battery cell 510 are integrated into a whole, so that the stability of the battery cell 510 is excellent, and the thickness of the display module can be reduced.

[0094] In one embodiment, referring to Figure 3 As shown in the cross-sectional structure diagram of the display module, the battery unit 510 includes a first electrode layer 511 , a functional layer 512 , and a second electrode layer 513 which are stacked. The first electrode layer 511 is located on a side of the functional layer 512 close to the first sub-cover plate 410 .

[0095] In one embodiment, the material of the functional layer 512 includes at least one of perovskite, copper zinc tin sulfur selenide and crystalline silicon.

[0096] Optionally, the functional layer 512 includes a first carrier transport layer, a photoactive layer, and a second carrier transport layer which are stacked, and the first carrier transport layer is located on a side of the photoactive layer close to the first sub-cover plate 410. One of the first carrier transport layer and the second carrier transport layer is an electron transport layer, and the other of the first carrier transport layer and the second carrier transport layer is a hole transport layer.

[0097] Exemplarily, the material of the photoactive layer includes at least one of perovskite, copper zinc tin sulfur selenide and crystalline silicon.

[0098] For example, the light path of the light emitted by the light emitting device 300 is as follows: Figure 2 As shown in S.

[0099] It is understandable that the battery cell 510 may be light-transmissive or opaque. In one embodiment, the light transmittance of the battery cell 510 is 40% to 90%, for example, 40%, 60%, 80% or 90%. As a result, the light transmittance of the battery cell 510 is relatively high, which is conducive to improving the aesthetics of the display module; and the battery cell 510 is conducive to absorbing or blocking large-angle light in the light-emitting device 300, avoiding crosstalk of light from adjacent light-emitting devices 300.

[0100] Exemplarily, the material of the photoactive layer is preferably perovskite, which can adjust light transmittance.

[0101] In one embodiment, the second electrode layer 513 is transparent, so that ambient light can be incident on the functional layer 512 smoothly, and the battery unit 510 can generate electricity.

[0102] It is understandable that the first electrode layer 511 can be transparent or opaque; whether the first electrode layer 511 is transparent or not will hardly affect the power generation function of the battery unit 510. In one embodiment, the first electrode layer 511 is transparent. This helps to improve the light transmittance of the battery unit 510 and improve the aesthetics of the display module.

[0103] In one embodiment, the material of the first electrode layer 511 includes indium tin oxide (ITO) and / or fluorine-doped tin oxide (FTO); the material of the second electrode layer 513 includes indium tin oxide and / or fluorine-doped tin oxide. Thus, the first electrode layer 511 and the second electrode layer 513 have better conductivity and transparency.

[0104] It can be understood that when the first electrode layer 511 is transparent, the wide-angle light emitted from the light-emitting device 300 will be absorbed by the battery unit 510, which increases the power generation of the battery unit 510 while helping to avoid crosstalk of wide-angle light between adjacent light-emitting devices 300, thereby improving the display quality of the display module.

[0105] In one embodiment, referring to Figure 4 The cross-sectional structure diagram of the second sub-cover plate shown in FIG. Figure 5 In the schematic diagram of the top view of the second sub-cover plate shown in the figure, the second sub-cover plate 420 includes a first portion 421 and a second portion 422, and the second portion 422 surrounds the first portion 421; in the direction close to the first sub-cover plate 410, along the direction parallel to the plane where the substrate 100 is located, the second portion 422 gradually moves away from the first portion 421. Thus, it is helpful to reduce the gap after the first sub-cover plate 410 and the second sub-cover plate 420 are sealed, and improve the sealing effect of the first sub-cover plate 410 and the second sub-cover plate 420.

[0106] In one embodiment, the angle α between the second portion 422 and the plane perpendicular to the substrate 100 is 30-60°, for example, 30°, 40°, 50° or 60°. In one embodiment, the second portion 422 is sealed to the first sub-cover 410 on one side close to the substrate 100 .

[0107] In one embodiment, referring to Figure 6 The cross-sectional structure diagram of the display module shown in the figure shows that the display module further includes: an anti-reflection film 600, which is located on the side of the second sub-cover plate 420 away from the substrate 100. This helps to reduce the reflection of ambient light on the surface of the cover plate 400 away from the substrate 100, increase the amount of light incident on the battery unit 510, and improve the power generation of the battery unit 510; at the same time, the display module of the present application can save the polarizer or color filter layer, and adjust the transmittance and chromaticity through the anti-reflection film 600, which helps to eliminate the phenomenon of uneven brightness or color (mura phenomenon) of the display module when the screen is off.

[0108] In one embodiment, the thickness of the second sub-cover plate 420 is 0.3-1 mm, for example, 0.3 mm, 0.5 mm, 0.8 mm or 1 mm.

[0109] For example, the first sub-cover plate 410 and the second sub-cover plate 420 may be chemically strengthened glass, which may be strengthened by ion exchange in a high concentration of potassium nitrate or a mixed solution of potassium nitrate and sodium nitrate, thereby protecting the display screen.

[0110] In one embodiment, the solar cell assembly 500 further includes a first current extraction structure 530 and a second current extraction structure 540. For example, the solar cell assembly 500 includes a battery cell 510, the first current extraction structure 530 is electrically connected to the first electrode layer 511 of the battery cell 510, and the second current extraction structure 540 is electrically connected to the second electrode layer 513 of the battery cell 510. Thus, it is convenient to extract and utilize the electricity generated by the battery cell 510. For example, referring to Figure 7 The cross-sectional structure diagram of the display module shown in the figure shows that the solar cell assembly 500 includes a plurality of battery cells 510 , the first current lead-out structure 530 is electrically connected to the first electrode layer 511 of one battery cell 510 , and the second current lead-out structure 540 is electrically connected to the second electrode layer 513 of another battery cell 510 .

[0111] In one embodiment, referring to Figure 7, the display module includes a frame area NA; in the frame area NA, a through hole 411 is provided in the first sub-cover plate 410, and the first current lead-out structure 530 and the second current lead-out structure 540 are respectively led out through the through hole 411. Thus, it is convenient to lead out the electric energy generated in the battery unit 510, and it will hardly affect the light emission of the light emitting device 300, and will not affect the display effect of the display module. In one embodiment, referring to Figure 7 The display module further includes a display area AA, the frame area NA surrounds the display area AA, the through hole 411 includes a first sub-through hole 4111 and a second sub-through hole 4112, the first sub-through hole 4111 and the second sub-through hole 4112 are located on opposite sides of the display area AA, the first current lead-out structure 530 leads out through the first sub-through hole 4111, and the second current lead-out structure 540 leads out through the second sub-through hole 4112. Thus, it is more conducive to the lead-out of the electric energy generated in the battery unit 510, and it is also conducive to the wiring of the first current lead-out structure 530 and the second current lead-out structure 540.

[0112] Optionally, the first current lead-out structure 530 is sealed and connected to the first sub-through hole 4111 by a sealant 1400, and the second current lead-out structure 540 is sealed and connected to the second sub-through hole 4112 by a sealant 1400. This helps to prevent moisture from invading the solar cell assembly 500.

[0113] In one embodiment, referring to Figure 8 In the schematic diagram of the top view of the display panel shown, the frame area NA includes two first sub-frame areas NA1 and two second sub-frame areas NA2, the width W1 of the first sub-frame area NA1 is greater than the width W2 of the second sub-frame area NA2, and the first sub-through hole 4111 and the second sub-through hole 4112 are both located in the first sub-frame area NA1. Therefore, the orthographic projection of the first sub-frame area NA1 on the substrate 100 can completely cover the orthographic projection of the through hole 411 on the substrate 100, and the current of the battery unit 510 can be smoothly drawn out without increasing the width of the frame area NA.

[0114] It is understandable that the edge of the battery cell 510 near the border area NA is obtained by laser scribing, and the edge is a dead zone of the battery cell 510 , and the orthographic projection of the border area NA on the substrate 100 can cover the orthographic projection of the edge on the substrate 100 .

[0115] Optionally, the display module further includes a first shielding layer 1100, which is located in the frame area NA, and the through hole 411 penetrates the first shielding layer 1100; for example, referring to Fig. 9 , the first shielding layer 1100 is located on the side of the first sub-cover plate 410 close to the substrate 100; for another example, referring to Fig.10The first shielding layer 1100 is located on a side of the first sub-cover plate 410 close to the second sub-cover plate 420 .

[0116] Optionally, the display module further includes a second shielding layer 1200 located in the frame area NA; for example, referring to Fig.11 , the second shielding layer 1200 is located on the side of the second sub-cover plate 420 close to the first sub-cover plate 410; for another example, referring to Fig.12 The second shielding layer 1200 is located on a side of the second sub-cover plate 420 facing away from the substrate 100 .

[0117] It is understandable that in the process of preparing solar cell modules, laser is used to scribe the edges of the solar cell modules to obtain dead zones. After laser scribe, part of the film layers in the solar cell modules will melt, and the orthographic projections of the first shielding layer 1100 and the second shielding layer 1200 on the substrate 100 cover at least part of the edge of the orthographic projection of the solar cell module 500 on the substrate 100.

[0118] Optionally, the first current extraction structure 530 includes a wire, and / or the second current extraction structure 540 includes a wire, thereby facilitating wiring and achieving a better current extraction effect.

[0119] In one embodiment, referring to Fig.13 In the schematic diagram of the top view of the pixel defining layer and the battery unit, the number of the battery unit 510 is 1, and in the display area AA, the orthographic projection of the battery unit 510 on the substrate 100 overlaps with the orthographic projection of the pixel defining layer 200 on the substrate 100. As a result, the distribution area of ​​the battery unit 510 is larger, which is conducive to increasing the power generation of the battery unit 510.

[0120] It can be understood that in the direction perpendicular to the substrate 100 , the cross-sectional shape of the pixel defining layer 200 includes an inverted trapezoid. At this time, the orthographic projection of the battery cell 510 on the substrate 100 overlaps with the orthographic projection of the surface of the pixel defining layer 200 facing away from the substrate 100 on the substrate 100 .

[0121] In one embodiment, referring to Fig.14 The schematic diagram of the top view structure of the pixel defining layer and the battery cell shown in the figure shows that there are multiple battery cells 510, and the multiple battery cells 510 are connected in series; the solar cell assembly 500 also includes: a conductive structure 550, in which the first electrode layer 511 of one battery cell 510 is electrically connected to the second electrode layer 513 of another battery cell 510 through the conductive structure 550.

[0122] In one embodiment, the orthographic projection of the conductive structure 550 on the substrate 100 is within the orthographic projection range of the pixel defining layer 200 on the substrate 100. The conductive structure 550 does not affect the emitted light of the light-emitting device 300 and does not affect the display effect of the display module.

[0123] Exemplarily, the conductive structure 550 includes a wire. This is beneficial for wiring, and the series connection effect between the battery cells 510 is relatively good.

[0124] In one embodiment, referring to Figure 1 , the display module further includes: an encapsulation layer 700, located between the light-emitting device 300 and the cover plate 400, and the orthographic projection of the encapsulation layer 700 on the substrate 100 covers the orthographic projections of the light-emitting device 300 and the pixel defining layer 200 on the substrate 100.

[0125] In one embodiment, referring to Fig.15 the cross-sectional structure schematic diagram of the display module shown, the display module further includes: an optical adhesive layer 800, located between the cover plate 400 and the encapsulation layer 700. Thus, it is beneficial to achieve high-precision fitting between the cover plate 400 and the encapsulation layer 700. Exemplarily, the fitting precision is less than or equal to 3 μm, so that the matching degree between the battery cells 510 in the cover plate and the pixel defining layer 200 is relatively high, preventing the phenomenon that the battery cells 510 cover the pixel light-emitting devices 300 and thus affecting the optical display effect.

[0126] In one embodiment, referring to Fig.15 , the solar cell assembly encloses a plurality of openings 520, and the display module further includes: a filling layer 900, located in the openings 520; optionally, the transparency of the filling layer 900 is greater than or equal to 90%, for example, it can be 90%, 93%, 96%, 99% or 100%, etc. Thus, the setting of the filling layer 900 is beneficial to improve the encapsulation effect of the battery cells 510 and is also beneficial to enhancing the overall mechanical strength of the cover plate 400 and the solar cell assembly.

[0127] Exemplarily, the preparation method of the filling layer 900 includes but is not limited to being prepared by the LIPO (Low injection pressure overmolding) method, and can also be prepared by the IJP (inkjet printing) method.

[0128] Optionally, the filling layer 900 includes an optical adhesive, and the optical adhesive does not react with the battery cells 510.

[0129] The second aspect of the present application provides a preparation method of a display module. Referring to Fig.16 the process schematic diagram of the preparation method of the display module shown, the preparation method of the display module includes the following steps.

[0130] S100: preparing a light-emitting device and a pixel defining layer on one side of a substrate, wherein the pixel defining layer encloses a plurality of pixel openings, and at least part of the light-emitting device is located in the pixel openings.

[0131] It should be noted that the substrate, the light-emitting device and the pixel defining layer are consistent with the previous description and will not be elaborated here.

[0132] S200: preparing a cover plate and a solar cell assembly on a side of the light-emitting device facing away from the substrate, wherein the solar cell assembly includes at least one battery cell, the battery cell is located in the cover plate, and the orthographic projection of the battery cell on the substrate is located within the orthographic projection range of the pixel defining layer on the substrate.

[0133] It should be noted that the cover plate and the solar cell assembly are consistent with the above description and will not be described in detail here.

[0134] In one embodiment, the steps of preparing a cover plate and a solar cell assembly on a side of the light-emitting device facing away from the substrate include: preparing the solar cell assembly on one side of a first sub-cover plate; buckling a second sub-cover plate on a side of the solar cell assembly facing away from the first sub-cover plate to obtain a cover plate including the first sub-cover plate and the second sub-cover plate; and fixing the cover plate and the solar cell assembly on a side of the light-emitting device facing away from the substrate.

[0135] Illustratively, fixing the cover plate and the solar cell assembly on the side of the light emitting device facing away from the substrate includes but is not limited to attaching the first sub-cover plate to the side of the light emitting device facing away from the substrate.

[0136] In one embodiment, the step of preparing a solar cell assembly on one side of a first sub-cover plate includes: opening a through hole in the first sub-cover plate; sequentially preparing a first electrode layer, a functional layer, and a second electrode layer on one side of the first sub-cover plate to obtain at least one battery cell; electrically connecting a first current lead-out structure to a first electrode layer of a battery cell and then leading the current out of the through hole, and electrically connecting a second current lead-out structure to a second electrode layer of a battery cell and then leading the current out of the through hole to obtain a solar cell assembly.

[0137] Illustratively, the preparation methods of the first electrode layer, the functional layer and the second electrode layer include but are not limited to sputtering, evaporation and spin coating, etc., which are conventional processes and will not be described in detail here.

[0138] Optionally, before preparing the first electrode layer on one side of the first sub-cover plate, the first sub-cover plate is cleaned.

[0139] Exemplarily, the method of opening the through hole in the first sub-cover plate includes laser drilling and / or etching.

[0140] Exemplarily, the step of opening a through hole in the first sub-cover includes: opening a through hole in the first sub-cover and the first shielding layer; the first shielding layer is located on a side of the first sub-cover close to the substrate; and / or the first shielding layer is located on a side of the first sub-cover close to the second sub-cover.

[0141] In one embodiment, after the step of fastening the second sub-cover plate to the side of the solar cell assembly away from the first sub-cover plate, the method further includes: sealingly connecting the first sub-cover plate and the second sub-cover plate.

[0142] Optionally, the sealing connection between the first sub-cover plate and the second sub-cover plate includes gluing and / or laser sintering.

[0143] In a specific embodiment, the method for preparing a display module comprises the following steps:

[0144] 1. Clean the first sub-cover 410.

[0145] 2. Open through holes 411 in the first sub-frame areas NA1 located at opposite ends of the first sub-cover plate 410 (see Fig.17 ); The method of opening the through hole 411 includes but is not limited to laser etching or chemical etching.

[0146] 3. After the through hole 411 is made, avoid the position corresponding to the light emitting device 300. And make the battery unit 510 at the position corresponding to the pixel definition layer 200. In the direction away from the first sub-cover plate 410, the structure of the battery unit 510 is sequentially a first electrode layer 511, a functional layer 512 and a second electrode layer 513. For details, refer to Fig.18 .

[0147] 4. The first current lead-out structure 530 is electrically connected to the first electrode layer 511 of the battery cell 510 and then led out from the through hole 411. The second current lead-out structure 540 is electrically connected to the second electrode layer 513 of the battery cell 510 and then led out from the through hole 411. The second sub-cover plate 420 is buckled with the first sub-cover plate 410. For details, refer to Fig.19 After buckling, you can use waterproof glue with good packaging effect, or you can use Frit hard screen packaging method for packaging, or you can use laser sintering technology for packaging.

[0148] 5. The first sub-cover plate 410 and the encapsulation layer 700 are bonded with high precision by OCA optical adhesive, and the bonding precision is less than or equal to 3 μm. For details, refer to Fig. 20 .

[0149] It should be noted that the display module prepared by the preparation method of this embodiment can be combined with the display module described in the previous embodiment in whole or in part, and will not be described in detail here.

[0150] A third aspect of the present application provides a display device, comprising the aforementioned display module, or comprising a display module prepared by the aforementioned preparation method.

[0151] In one embodiment, referring to Fig.21 As shown in the structural schematic diagram of the display device, the display device also includes: a power storage component 1000, located on the side of the substrate 100 away from the pixel defining layer 200, the power storage component 1000 is electrically connected to the solar cell component 500 in the display module, and the power storage component 1000 is used to store the electrical energy generated by the solar cell component 500.

[0152] In one embodiment, referring to Fig.21 The solar cell assembly 500 includes a first current lead-out structure 530 and a second current lead-out structure 540 , and the power storage assembly 1000 is respectively connected to the first current lead-out structure 530 and the second current lead-out structure 540 .

[0153] In one embodiment, the display device further includes a main battery 1300, which is located on the same side of the substrate 100 as the power storage assembly 1000, and the power storage assembly 1000 is electrically connected to the main battery 1300. It can be understood that the main battery 1300 is the main power supply battery of the display device; the main battery 1300 is used to power the light-emitting device 300.

[0154] It is understandable that the electricity generated by the solar cell assembly 500 can be stored in the power storage assembly 1000, and the power storage assembly 1000 can be used as a backup battery.

[0155] It can be understood that the display device has a main battery for powering the light-emitting device. In the prior art, the volume and thickness of the main battery are relatively large. However, in the display device of the embodiment of the present application, the volume and thickness of the main battery can be reduced. The main battery is electrically connected to the power storage component 1000. When the power in the main battery 1300 is insufficient, the power in the power storage component 1000 can be output to the main battery 1300 to meet the display requirements of the display module.

[0156] It can be understood that the substrate of the display module includes a driving circuit, and the driving circuit is electrically connected to the light emitting device 300 .

[0157] Exemplarily, the power storage component 1000 is electrically connected to at least one light emitting device 300 in the display module. It is understandable that the power storage component 1000 and the light emitting device 300 can be directly electrically connected or indirectly electrically connected; for example, the power storage component 1000 can be electrically connected to the main battery 1300, the main battery 1300 is electrically connected to the driving circuit in the substrate, and the driving circuit is electrically connected to the light emitting device 300.

[0158] In the display device of the embodiment of the present application, the solar cell assembly 500 provides part of the power for the whole device, thereby reducing the dependence on the main battery 1300 of the whole device, making the display device more convenient and not limited by power supply, thereby improving the portability of the display device.

[0159] It is understandable that the display device may be a liquid crystal (LCD) display device or an organic light emitting diode (OLED) display device.

[0160] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0161] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A display module, characterized in that: include: substrate; A pixel defining layer, located on one side of the substrate, the pixel defining layer enclosing a plurality of pixel openings; a plurality of light emitting devices, at least some of which are located in the pixel openings; A cover plate, located on a side of the light emitting device away from the substrate; The solar cell assembly comprises at least one battery unit, wherein the battery unit is located in the cover plate, and the orthographic projection of the battery unit on the substrate is located within the orthographic projection range of the pixel defining layer on the substrate.

2. The display module according to claim 1, characterized in that: The cover plate comprises a first sub-cover plate and a second sub-cover plate, the first sub-cover plate is located on a side of the second sub-cover plate close to the substrate, and the battery unit is located between the first sub-cover plate and the second sub-cover plate; Preferably, the light transmittance of the battery unit is 40-90%; Preferably, the battery cell comprises a first electrode layer, a functional layer and a second electrode layer which are stacked, and the first electrode layer is located on a side of the functional layer close to the first sub-cover plate; Preferably, the first electrode layer and / or the second electrode layer are transparent; Preferably, the material of the first electrode layer includes indium tin oxide and / or fluorine-doped tin oxide; Preferably, the material of the second electrode layer includes indium tin oxide and / or fluorine-doped tin oxide; Preferably, the material of the functional layer includes at least one of perovskite, copper-zinc-tin-sulfur-selenium and crystalline silicon; Preferably, the second sub-cover plate comprises a first portion and a second portion, the second portion surrounds the first portion; in a direction close to the first sub-cover plate and in a direction parallel to the plane where the substrate is located, the second portion gradually moves away from the first portion; Preferably, a side of the second portion close to the substrate is sealed and connected to the first sub-cover; Preferably, the angle between the second portion and the direction perpendicular to the plane where the substrate is located is 30-60°; Preferably, the display module further comprises: an anti-reflection film located on a side of the second sub-cover plate away from the substrate; Preferably, the second sub-cover plate has a thickness of 0.3-1 mm.

3. The display module according to claim 2, characterized in that: The solar cell assembly includes a battery cell, and the solar cell assembly also includes a first current lead-out structure and a second current lead-out structure, the first current lead-out structure is electrically connected to the first electrode layer of the battery cell, and the second current lead-out structure is electrically connected to the second electrode layer of the battery cell; or, The solar cell assembly includes a plurality of battery cells, the first current lead-out structure is electrically connected to the first electrode layer of one of the battery cells, and the second current lead-out structure is electrically connected to the second electrode layer of another of the battery cells; Preferably, the display module includes a frame area, in which the first sub-cover plate is provided with a through hole, and the first current lead-out structure and the second current lead-out structure are respectively led out through the through hole; Preferably, the display module further comprises a first shielding layer located in the frame region, and the through hole penetrates the first shielding layer; The first shielding layer is located on a side of the first sub-cover plate close to the substrate; and / or the first shielding layer is located on a side of the first sub-cover plate close to the second sub-cover plate; Preferably, the display module further comprises a second shielding layer located in the frame area; The second shielding layer is located on a side of the second sub-cover plate close to the first sub-cover plate; and / or the second shielding layer is located on a side of the second sub-cover plate away from the substrate; Preferably, the display module further includes a display area, the frame area surrounds the display area, the through hole includes a first sub-through hole and a second sub-through hole, the first sub-through hole and the second sub-through hole are located on opposite sides of the display area, the first current lead-out structure is led out through the first sub-through hole, and the second current lead-out structure is led out through the second sub-through hole; Preferably, the first current lead-out structure is sealed and connected to the first sub-through hole by a sealant; the second current lead-out structure is sealed and connected to the second sub-through hole by a sealant; Preferably, the frame area includes two first sub-frame areas and two second sub-frame areas that are oppositely arranged, the width of the first sub-frame area is greater than the width of the second sub-frame area, and the first sub-through hole and the second sub-through hole are both located in the first sub-frame area; Preferably, the first current lead-out structure includes a wire, and / or the second current lead-out structure includes a wire.

4. The display module according to claim 1, characterized in that: The number of the battery unit is 1, and in the display area of ​​the display module, the orthographic projection of the battery unit on the substrate overlaps with the orthographic projection of the pixel definition layer on the substrate; Preferably, an orthographic projection of the battery unit on the substrate overlaps with an orthographic projection of a surface of the pixel defining layer facing away from the substrate on the substrate.

5. The display module according to claim 1, characterized in that: There are multiple battery cells, and the multiple battery cells are connected in series; Preferably, the battery cell comprises a first electrode layer, a functional layer and a second electrode layer which are stacked, and the first electrode layer is located on a side of the functional layer close to the substrate; The solar cell assembly further comprises: a conductive structure, wherein the first electrode layer of one of the adjacent battery cells is electrically connected to the second electrode layer of another of the adjacent battery cells through the conductive structure; Preferably, the orthographic projection of the conductive structure on the substrate is located within the orthographic projection range of the pixel defining layer on the substrate; Preferably, the conductive structure comprises a conductive wire.

6. The display module according to claim 1, characterized in that: Also includes: An encapsulation layer, located between the light-emitting device and the cover plate, wherein the orthographic projection of the encapsulation layer on the substrate covers the orthographic projections of the light-emitting device and the pixel defining layer on the substrate; Preferably, it further comprises: an optical adhesive layer located between the cover plate and the packaging layer; Preferably, the solar cell assembly encloses a plurality of openings, and the display module further comprises: a filling layer located in the openings; Preferably, the transparency of the filling layer is greater than or equal to 90%.

7. A method for preparing a display module, characterized in that: include: A light-emitting device and a pixel defining layer are prepared on one side of the substrate, wherein the pixel defining layer encloses a plurality of pixel openings, and at least part of the light-emitting device is located in the pixel openings; A cover plate and a solar cell assembly are prepared on the side of the light-emitting device facing away from the substrate. The solar cell assembly includes at least one battery cell. The battery cell is located in the cover plate, and the orthographic projection of the battery cell on the substrate is within the orthographic projection range of the pixel defining layer on the substrate.

8. The preparation method according to claim 7, characterized in that: The step of preparing a cover plate and a solar cell assembly on a side of the light emitting device away from the substrate comprises: preparing a solar cell assembly on one side of the first sub-cover; Buckling a second sub-cover plate on a side of the solar cell assembly away from the first sub-cover plate to obtain the cover plate including the first sub-cover plate and the second sub-cover plate; Fixing the cover plate and the solar cell assembly on a side of the light emitting device away from the substrate; Preferably, the step of preparing a solar cell assembly on one side of the first sub-cover comprises: A through hole is formed in the first sub-cover plate; Sequentially preparing a first electrode layer, a functional layer, and a second electrode layer on one side of the first sub-cover plate to obtain at least one of the battery cells; The first current lead-out structure is electrically connected to the first electrode layer of one of the battery cells and then led out from the through hole, and the second current lead-out structure is electrically connected to the second electrode layer of one of the battery cells and then led out from the through hole to obtain the solar cell module; Preferably, the method of opening the through hole in the first sub-cover plate includes laser drilling and / or etching; Preferably, the step of opening a through hole in the first sub-cover plate comprises: opening the through hole in the first sub-cover plate and the first shielding layer; the first shielding layer is located on a side of the first sub-cover plate close to the substrate; and / or the first shielding layer is located on a side of the first sub-cover plate close to the second sub-cover plate; Preferably, after the step of fastening the second sub-cover plate on the side of the solar cell assembly away from the first sub-cover plate, the method further comprises: Sealingly connecting the first sub-cover plate and the second sub-cover plate; Preferably, the sealing connection between the first sub-cover plate and the second sub-cover plate includes gluing and / or laser sintering.

9. A display device, characterized in that: The display module comprises the display module according to any one of claims 1 to 6, or comprises the display module prepared by the preparation method according to claim 7 or 8.

10. The display device according to claim 9, characterized in that: Also includes: A power storage component is located on a side of the substrate away from the pixel defining layer, and the power storage component is electrically connected to the solar cell component in the display module; The power storage component is used to store the electric energy generated by the solar cell component; Preferably, the solar cell assembly comprises a first current lead-out structure and a second current lead-out structure, and the power storage assembly is electrically connected to the first current lead-out structure and the second current lead-out structure respectively; Preferably, the power storage component is electrically connected to at least one light emitting device in the display module; Preferably, the display device further comprises a main battery, which is located on the same side of the substrate as the power storage component, and the power storage component is electrically connected to the main battery; The main battery is used to supply power to the light-emitting device; Preferably, the main battery is electrically connected to at least one light-emitting device in the display module.

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