Display module, preparation method thereof and display device

Abstract

The invention provides a display module, a preparation method thereof and a display device, relates to the technical field of display, and improves the material utilization rate. The display module comprises an array substrate, a blue light-emitting layer, a first electrode layer, a color conversion layer, a second electrode layer and a third electrode layer, the color conversion layer is located on the side, away from the array substrate, of the first electrode layer and comprises a plurality of light conversion units, and the light conversion units comprise coupling quantum dots; the orthographic projection of the blue light-emitting layer and the orthographic projection of the light conversion units on the array substrate are at least partially overlapped, so that blue light emitted by the blue light-emitting layer excites one part of the light conversion units to emit red light, and under the combined action of the blue light, the first electrode layer and the second electrode layer, the other part of the light conversion units emit green light, and therefore full colors of red, green and blue are achieved. And the color conversion layer can be obtained only by preparing a coupling quantum dot material once, namely, photoetching film forming once is only needed, so that the material waste is greatly reduced, and the material utilization rate is improved.

Description

Technical Field

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

[0002] In recent years, light conversion has become a common method for achieving full-color red, green, and blue displays in display technology, offering broad application prospects. Specifically, this method uses a blue light source to excite red and green quantum dot materials, causing the red quantum dot to emit red light and the green quantum dot to emit green light. However, practical applications still present several challenges that need to be addressed. Summary of the Invention

[0003] In order to solve the above technical problems, the present application is proposed. The embodiments of the present application provide a display module, a manufacturing method thereof, and a display device.

[0004] In a first aspect, an embodiment of the present application provides a display module, which includes an array substrate, a blue light-emitting layer, a first electrode layer, a color conversion layer, a second electrode layer and a third electrode layer, wherein the blue light-emitting layer is located on one side of the array substrate; the first electrode layer is located on the side of the blue light-emitting layer away from the array substrate; the color conversion layer is located on the side of the first electrode layer away from the array substrate, the color conversion layer includes a plurality of light conversion units, and the light conversion units include coupled quantum dots; the second electrode layer is located on the side of the color conversion layer away from the array substrate; the third electrode layer is located on the side of the blue light-emitting layer close to the array substrate, and the third electrode layer, the blue light-emitting layer and the first electrode layer constitute a blue light-emitting device; the orthographic projections of the blue light-emitting layer and the light conversion unit on the array substrate at least partially overlap.

[0005] In combination with the first aspect, in some implementations of the first aspect, the display module further includes an encapsulation layer, and the encapsulation layer is located between the first electrode layer and the color conversion layer.

[0006] Preferably, the encapsulation layer includes a first encapsulation layer, a second encapsulation layer and a third encapsulation layer stacked in sequence.

[0007] Preferably, the materials of the first encapsulation layer, the second encapsulation layer and the third encapsulation layer include any one of organic materials and inorganic materials.

[0008] Preferably, the first encapsulation layer is an inorganic material, the second encapsulation layer is an organic material, and the third encapsulation layer is an inorganic material.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the coupled quantum dots include a first core-shell quantum dot and a second core-shell quantum dot that are coupled and connected.

[0010] Preferably, the first core-shell quantum dot includes a first inner core and a first shell layer, and the first shell layer wraps the first inner core; the second core-shell quantum dot includes a second inner core and a second shell layer, and the second shell layer wraps the second inner core.

[0011] Preferably, the materials of the first inner core and the second inner core both include at least one of cadmium selenide, cadmium sulfide, zinc oxide, and indium sulfide, and the materials of the first shell layer and the second shell layer both include at least one of zinc sulfide, gallium arsenide, mercury sulfide, aluminum arsenide, and zinc selenide.

[0012] Preferably, the materials of the first inner core and the second inner core are different, and / or the materials of the first shell layer and the second shell layer are different.

[0013] Combined with the first aspect, in some implementation manners of the first aspect, the display module further includes a pixel defining layer, the pixel defining layer is located between the array substrate and the first electrode layer, the pixel defining layer encloses to form a plurality of pixel openings, and the blue light-emitting layer is located within the pixel openings.

[0014] Preferably, the display module further includes a fourth electrode layer, the fourth electrode layer is located between the green light conversion unit and the encapsulation layer, and the orthographic projection of the green light conversion unit on the array substrate overlaps with the orthographic projection of the fourth electrode layer on the array substrate.

[0015] Preferably, the first electrode layer is a cathode.

[0016] Preferably, the third electrode layer is an anode.

[0017] Preferably, the fourth electrode layer is a cathode.

[0018] Preferably, the second electrode layer is made of a transparent material, and the second electrode layer is an anode.

[0019] Combined with the first aspect, in some implementation manners of the first aspect, the color conversion layer further includes a light-transmitting portion, and the light-transmitting portion is located between adjacent light conversion units.

[0020] Preferably, the orthographic projection of the light conversion unit on the array substrate overlaps with at least a part of the orthographic projection of the blue light-emitting layer on the array substrate; the orthographic projection of the light-transmitting portion on the array substrate overlaps with at least a part of the orthographic projection of the blue light-emitting layer on the array substrate.

[0021] Preferably, the display module further includes a red light-emitting region, a green light-emitting region, and a blue light-emitting region, the light conversion unit includes a red light conversion unit and a green light conversion unit, the red light conversion unit is located within the red light-emitting region, the green light conversion unit is located within the green light-emitting region, and the light-transmitting portion is located within the blue light-emitting region.

[0022] Preferably, the light-transmitting portion includes scattering particles.

[0023] Preferably, the scattering particles include at least one of silica particles, calcium carbonate particles, alumina particles, titanium oxide particles, and barium sulfate particles.

[0024] Combined with the first aspect, in some implementations of the first aspect, the positive projection of the second electrode layer on the array substrate at least partially overlaps with the positive projection of the green light conversion unit on the array substrate.

[0025] Preferably, the positive projection of the second electrode layer on the array substrate overlaps with the positive projection of the green light conversion unit on the array substrate.

[0026] Preferably, the side of the red light conversion unit away from the array substrate does not include the second electrode layer.

[0027] Combined with the first aspect, in some implementations of the first aspect, the color conversion layer further includes an occlusion portion, the occlusion portion encloses to form a plurality of openings, and the red light conversion unit, the green light conversion unit, and the light-transmitting portion are disposed in the plurality of openings.

[0028] Preferably, the occlusion portion is black.

[0029] Combined with the first aspect, in some implementations of the first aspect, the display module further includes a filter unit, the filter unit is located on the side of the light conversion unit or the second electrode layer away from the array substrate, and the positive projection of the filter unit on the array substrate at least partially overlaps with the positive projection of the light conversion unit on the array substrate.

[0030] Preferably, the positive projection of the filter unit on the array substrate overlaps with the positive projection of the light conversion unit on the array substrate.

[0031] Preferably, the openings expose the filter unit.

[0032] Preferably, the filter unit includes a red filter unit, a green filter unit, and a blue filter unit. The red filter unit is located on the side of the red light conversion unit away from the array substrate; the green filter unit is located on the side of the green light conversion unit away from the array substrate, and the green filter unit is located on the side of the second electrode layer away from the array substrate; the blue filter unit is located on the side of the light-transmitting portion away from the array substrate.

[0033] Preferably, at least a part of the filter unit and the light conversion unit are located in the same opening.

[0034] Preferably, at least a part of the filter unit and the light-transmitting portion are located in the same opening.

[0035] Preferably, the side of the filter unit away from the array substrate is flush with the side of the occlusion portion away from the array substrate.

[0036] Second aspect, an embodiment of the present application provides a method for manufacturing a display module. The manufacturing method includes: providing an array substrate; manufacturing a blue light-emitting layer on one side of the array substrate; manufacturing a first electrode layer on the side of the blue light-emitting layer facing away from the array substrate; manufacturing a color conversion layer on the side of the first electrode layer facing away from the array substrate, the color conversion layer includes a plurality of light conversion units, and the light conversion units contain coupled quantum dots; manufacturing a second electrode layer on the side of the color conversion layer facing away from the array substrate; before manufacturing the blue light-emitting layer on one side of the array substrate, the manufacturing method further includes: manufacturing a third electrode layer on one side of the array substrate; the third electrode layer, the blue light-emitting layer, and the first electrode layer form a blue light-emitting device; wherein, the orthographic projections of the blue light-emitting layer and the light conversion units on the array substrate at least partially overlap.

[0037] Third aspect, an embodiment of the present application provides a display device, and the display device includes the display module mentioned in any of the above embodiments.

[0038] The display module provided by the embodiment of the present application includes an array substrate, a blue light-emitting layer, a first electrode layer, a color conversion layer, a second electrode layer, and a third electrode layer. Among them, the blue light-emitting layer is located on one side of the array substrate; the first electrode layer is located on the side of the blue light-emitting layer facing away from the array substrate; the color conversion layer is located on the side of the first electrode layer facing away from the array substrate, the color conversion layer includes a plurality of light conversion units, and the light conversion units contain coupled quantum dots; the second electrode layer is located on the side of the color conversion layer facing away from the array substrate; the third electrode layer is located on the side of the blue light-emitting layer close to the array substrate, and the third electrode layer, the blue light-emitting layer, and the first electrode layer form a blue light-emitting device; the orthographic projections of the blue light-emitting layer and the light conversion units on the array substrate at least partially overlap, so that part of the light conversion units are excited by the blue light emitted by the blue light-emitting layer to emit red light, and under the combined action of the blue light, the first electrode layer, and the second electrode layer, another part of the light conversion units emit green light, thus realizing full-color red, green, and blue. And because only one coupling quantum dot material needs to be prepared for the color conversion layer, that is, only one photolithography film formation is required, thus greatly reducing the waste of materials and improving the utilization rate of materials. Description of the Drawings

[0039] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0040] Figure 1 The figure shows a schematic structural diagram of a display module provided by an embodiment of the present application.

[0041] Figure 2aThe figure shows a schematic structural diagram of a display module provided by another embodiment of the present application.

[0042] Figure 2b The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application.

[0043] Figure 3 The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application.

[0044] Figure 4 The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application.

[0045] Figure 5 The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application.

[0046] Figure 6a The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application.

[0047] Figure 6b The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application.

[0048] Figure 6c As shown Figure 6a A top view structural diagram of the shown display module.

[0049] Figure 6d As shown Figure 6a Another top view structural diagram of the shown display module.

[0050] Figure 7 The figure shows a schematic diagram of the structure and light emission principle of a coupled quantum dot unit provided by an embodiment of the present application.

[0051] Figure 8 The figure shows a schematic flow diagram of a method for manufacturing a display module provided by an embodiment of the present application.

[0052] Figure 9 The figure shows a schematic structural diagram of a display device provided by an embodiment of the present application.

[0053] Reference numerals: display module 100; red light-emitting region R; green light-emitting region G; blue light-emitting region B; array substrate 110; blue light-emitting layer 120; first electrode layer 130; color conversion layer 140; pixel definition layer PDL; red light conversion unit RZ; green light conversion unit GZ; second electrode layer 150; third electrode layer 160; fourth electrode layer 161; blue light-emitting device L; encapsulation layer 170; coupled quantum dot 141; first core-shell quantum dot 1411; second core-shell quantum dot 1412; light-transmitting portion 180; light-blocking portion 190; red light filtering unit r; green light filtering unit g; blue light filtering unit b; display device 10. Detailed implementation manners

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0055] In addition, for better illustration of the present application, numerous specific details are given in the following detailed implementation manners. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some instances, methods and means well-known to those skilled in the art are not described in detail so as to highlight the gist of the present application.

[0056] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0057] In addition, terms such as "first" and "second" are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0058] Figure 1 The figure shows a schematic structural diagram of a display module provided by an embodiment of the present application. Figure 2a The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application. As Figure 1 and 2a shown, the display module 100 provided by the embodiment of the present application includes an array substrate 110, a blue light-emitting layer 120, a first electrode layer 130, a color conversion layer 140, a second electrode layer 150, and a third electrode layer 160. Among them, the blue light-emitting layer 120 is located on one side of the array substrate 110; the first electrode layer 130 is located on the side of the blue light-emitting layer 120 away from the array substrate 110; the color conversion layer 140 is located on the side of the first electrode layer 130 away from the array substrate 110. The color conversion layer 140 includes a plurality of light conversion units, and the light conversion units contain coupled quantum dots; the second electrode layer 150 is located on the side of the color conversion layer 140 away from the array substrate 110; the third electrode layer 160 is located on the side of the blue light-emitting layer 120 close to the array substrate 110. The third electrode layer 160, the blue light-emitting layer 120, and the first electrode layer 130 form a blue light-emitting device L; the orthographic projections of the blue light-emitting layer 120 and the light conversion units on the array substrate 110 at least partially overlap.

[0059] In the display module 100 provided by the embodiment of the present application, part of the light conversion units are excited to emit red light by the blue light emitted by the blue light-emitting layer 120, and an electric field is formed between the first electrode layer 130 and the second electrode layer 150. Under the combined action of the blue light and the electric field, the other part of the light conversion units emit green light, thus realizing full-color RGB. Moreover, since the color conversion layer 140 can be obtained by only preparing the coupled quantum dot material once, that is, only one photolithography film formation is required, the waste of materials is greatly reduced and the material utilization rate is improved.

[0060] As Figure 2a shown, the display module 100 provided by the embodiment of the present application further includes a pixel defining layer PDL. The pixel defining layer PDL is located between the array substrate 110 and the first electrode layer 130. The pixel defining layer PDL encloses to form a plurality of pixel openings, and the blue light-emitting layer 120 is located within the pixel openings.

[0061] In the embodiment of the present application, the first electrode layer 130 is not only used to form a blue light-emitting device L with the blue light-emitting layer 120 and the third electrode layer 160, but also used to form an electric field to excite part of the light conversion units to emit green light. Therefore, there is no need to separately provide an electrode layer for forming the electric field, and the first electrode layer 130 in the blue light-emitting device L can be directly reused. Therefore, the display module 100 provided by the embodiment of the present application has a simple structure, fewer manufacturing process steps, and high production efficiency.

[0062] Figure 2b As shown in the structural schematic diagram of the display module provided by another embodiment of the present application. As Figure 2b shown, preferably, the display module 100 further includes a fourth electrode layer 161. The fourth electrode layer 161 is located between the green light conversion unit GZ and the encapsulation layer 170. The orthographic projection of the green light conversion unit GZ on the array substrate 110 overlaps with the orthographic projection of the fourth electrode layer 161 on the array substrate 110.

[0063] In the embodiment of the present application, an electric field is formed between the fourth electrode layer 116 and the second electrode layer 150. Under the combined action of the blue light and the electric field, the green light conversion unit GZ emits green light.

[0064] Preferably, the first electrode layer 130 is a cathode.

[0065] Preferably, the third electrode layer 160 is an anode.

[0066] Preferably, the fourth electrode layer 161 is a cathode.

[0067] Preferably, the second electrode layer 150 is made of a transparent material, thereby improving the light transmittance. The second electrode layer 150 is an anode.

[0068] Refer to Figure 2a, the display module 100 provided by the embodiment of the present application further includes a packaging layer 170, and the packaging layer 170 is located between the first electrode layer 130 and the color conversion layer 140.

[0069] The packaging layer 170 effectively blocks the intrusion of water and oxygen from the external environment, protecting the array substrate 110, the third electrode layer 160, the blue light-emitting layer 120, the first electrode layer 130, etc. from being eroded by water and oxygen, thereby reducing the adverse effects of water and oxygen in the external environment on the display module 100.

[0070] Preferably, the packaging layer 170 includes a first packaging layer 171, a second packaging layer 172, and a third packaging layer 173 that are stacked in sequence.

[0071] Preferably, the materials of the first packaging layer 171, the second packaging layer 172, and the third packaging layer 173 each include any one of organic materials and inorganic materials.

[0072] Preferably, the first packaging layer 171 is an inorganic material, the second packaging layer 172 is an organic material, and the third packaging layer 173 is an inorganic material. The packaging layer 170 provided by the embodiment of the present application adopts a structure in which inorganic materials and organic materials are alternately stacked, and the packaging effect is better.

[0073] Figure 3 The following is a schematic structural diagram of a display module provided by another embodiment of the present application. As Figure 3 shown, the color conversion layer 140 provided by the embodiment of the present application further includes a light-transmitting portion 180, and the light-transmitting portion 180 is located between adjacent light conversion units. The light-transmitting portion 180 improves the light transmittance.

[0074] Preferably, the orthographic projection of the light conversion unit on the array substrate 110 and the orthographic projection of the blue light-emitting layer 120 on the array substrate 110 at least partially overlap; the orthographic projection of the light-transmitting portion 180 on the array substrate 110 and the orthographic projection of the blue light-emitting layer 120 on the array substrate 110 at least partially overlap. As Figure 3 shown, the orthographic projection of the light conversion unit provided by the embodiment of the present application on the array substrate 110 overlaps with the orthographic projection of the corresponding blue light-emitting layer 120 on the array substrate 110, and the orthographic projection of the light-transmitting portion 180 on the array substrate 110 overlaps with the orthographic projection of the corresponding blue light-emitting layer 120 on the array substrate 110.

[0075] Preferably, the display module 100 further includes a red light-emitting region R, a green light-emitting region G, and a blue light-emitting region B. The light conversion unit includes a red light conversion unit RZ and a green light conversion unit GZ. The red light conversion unit RZ is located in the red light-emitting region R, the green light conversion unit GZ is located in the green light-emitting region G, and the light-transmitting portion 180 is located in the blue light-emitting region B.

[0076] Specifically, in the embodiment of the present application, the blue light emitted by the blue light-emitting layer 120 excites the red light conversion unit RZ to emit red light. Under the combined action of the blue light, the first electrode layer 130, and the second electrode layer 150, the green light conversion unit GZ emits green light, thereby realizing full-color red, green, and blue. Moreover, since the red light conversion unit RZ and the green light conversion unit GZ can be obtained by preparing the coupled quantum dot material only once, that is, only one photolithography film formation is required, the waste of materials is greatly reduced, and the utilization rate of materials is improved.

[0077] In some embodiments, the surface of the light-transmitting portion 180 facing away from the array substrate 110, the surface of the red light conversion unit RZ facing away from the array substrate 110, and the surface of the second electrode layer 150 located in the green light-emitting region G facing away from the array substrate 110 are flush, which is beneficial to the preparation of subsequent film layers.

[0078] Preferably, the light-transmitting portion 180 includes scattering particles. The scattering particles scatter the blue light, making the light more uniform in all directions and achieving better display effects from all viewing angles.

[0079] Preferably, the scattering particles include at least one of silicon oxide particles, calcium carbonate particles, aluminum oxide particles, titanium oxide particles, and barium sulfate particles.

[0080] Figure 4 The following is a schematic structural diagram of a display module provided by another embodiment of the present application. As Figure 4 shown, in some embodiments, the orthographic projection of the second electrode layer 150 on the array substrate 110 and the orthographic projection of the green light conversion unit GZ on the array substrate 110 at least partially overlap, so as to apply an electric field to the green light conversion unit GZ by using the first electrode layer 130 and the second electrode layer 150, and under the combined action of the blue light, the green light conversion unit GZ emits green light.

[0081] Preferably, the orthographic projection of the second electrode layer 150 on the array substrate 110 overlaps with the orthographic projection of the green light conversion unit GZ on the array substrate 110.

[0082] Preferably, the side of the red light conversion unit RZ away from the array substrate 110 does not include the second electrode layer 150.

[0083] Figure 5 The following is a schematic structural diagram of a display module provided by another embodiment of the present application. As Figure 5 shown, the color conversion layer 140 provided by the embodiment of the present application further includes a shielding portion 190. The shielding portion 190 encloses to form a plurality of openings, and the red light conversion unit RZ, the green light conversion unit GZ, and the light-transmitting portion 180 are respectively arranged in the plurality of openings.

[0084] More specifically, the shielding portion 190 is stacked on the side of the encapsulation layer 170 facing away from the array substrate 110.

[0085] The shielding portion 190 not only absorbs the deflected light emitted by the display module 100, avoiding crosstalk between lights of different colors, but also absorbs the light entering the display module 100 from the external environment, thereby avoiding reflection of the external ambient light at the light-emitting interface of the display module 100, and further improving the contrast of the display module 100.

[0086] Among them, the deflected light refers to the light in a direction other than the direction perpendicular to the array substrate 110.

[0087] Preferably, the shielding portion 190 is black, and the light absorption effect of black is better.

[0088] Figure 6a The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application. As Figure 6a shown, the display module 100 provided by the embodiment of the present application further includes a light filtering unit, the light filtering unit is located on the side of the light conversion unit or the second electrode layer 150 facing away from the array substrate 110, and the orthographic projection of the light filtering unit on the array substrate 110 at least partially overlaps with the orthographic projection of the light conversion unit on the array substrate 110.

[0089] The light filtering unit filters out light of a specific wavelength, thereby improving the contrast of the display module 100. Specifically, the red light emitted by the red light conversion unit RZ has a wavelength of 605 nm to 665 nm, and the wavelength of this red light becomes 615 nm to 645 nm after passing through the light filtering unit; the green light emitted by the green light conversion unit GZ has a wavelength of 500 nm to 560 nm, and the wavelength of this green light becomes 510 nm to 540 nm after passing through the light filtering unit; the blue light emitted by the blue light-emitting layer 120 in the blue light-emitting region B has a wavelength of 440 nm to 485 nm, and the wavelength of this blue light becomes 450 nm to 470 nm after passing through the light filtering unit. It should be noted that the wavelengths of the red light, green light, and blue light after passing through the light filtering unit are set according to actual needs.

[0090] Figure 6b The figure shows a schematic structural diagram of a display module provided by another embodiment of the present application. As Figure 6b shown, preferably, the orthographic projection of the light filtering unit on the array substrate 110 overlaps with the orthographic projection of the light conversion unit on the array substrate 110.

[0091] Preferably, the opening exposes the light filtering unit, so that the surface of the shielding portion 190 facing away from the array substrate 110 is flush with the surface of the light filtering unit facing away from the array substrate 110.

[0092] Preferably, the filter unit includes a red filter unit r, a green filter unit g, and a blue filter unit b. The red filter unit r is located on the side of the red light conversion unit RZ away from the array substrate 110; the green filter unit g is located on the side of the green light conversion unit GZ away from the array substrate 110, and the green filter unit g is located on the side of the second electrode layer 150 away from the array substrate 110; the blue filter unit b is located on the side of the light transmissive portion 180 away from the array substrate 110.

[0093] Specifically, the red light emitted by the red light conversion unit RZ is filtered by the red filter unit r, the green light emitted by the green light conversion unit GZ is filtered by the green filter unit g, and the blue light emitted by the blue light emitting layer 120 in the blue light emitting region B is filtered by the blue filter unit b.

[0094] Preferably, at least part of the filter unit and the light conversion unit are located in the same opening.

[0095] Specifically, the red filter unit r and the red light conversion unit RZ are located in the same opening, and the green filter unit g and the green light conversion unit GZ are located in the same opening.

[0096] Preferably, at least part of the filter unit and the light transmissive portion 180 are located in the same opening.

[0097] Specifically, the blue filter unit b and the light transmissive portion 180 are located in the same opening.

[0098] Preferably, the side of the filter unit away from the array substrate 110 is flush with the side of the shielding portion 190 away from the array substrate 110, which is beneficial to the preparation of subsequent film layers.

[0099] Figure 6c Shown as Figure 6a A top view structural schematic diagram of the shown display module. Figure 6d Shown as Figure 6a Another top view structural schematic diagram of the shown display module. As Figure 6c and 6d Shown, the display module includes a red light emitting region R, a green light emitting region G, and a blue light emitting region B.

[0100] Figure 7 Shown is a schematic diagram of the structure and light emitting principle of coupled quantum dots provided by an embodiment of the present application. As Figure 7 Shown, in the display module 100 provided by the embodiment of the present application, the coupled quantum dots 141 include a first core-shell quantum dot 1411 and a second core-shell quantum dot 1412 that are coupled and connected.

[0101] In an embodiment of the present application, the first core-shell quantum dot 1411 emits red light, and the second core-shell quantum dot 1412 emits green light. Specifically, the first core-shell quantum dot 1411 is excited by blue light to emit red light, and the second core-shell quantum dot 1412 emits green light under the combined action of blue light irradiation and the electric field formed by the first electrode layer 130 and the second electrode layer 150.

[0102] For the red light conversion unit RZ in the red light-emitting region R, the first core-shell quantum dot 1411 emits red light, and the second core-shell quantum dot 1412 does not emit light. For the green light conversion unit GZ in the green light-emitting region G, due to the electric field formed by the first electrode layer 130 and the second electrode layer 150, or the electric field formed by the fourth electrode layer 161 and the second electrode layer 150, the electron cloud of the coupled quantum dot 141 in the green light conversion unit GZ migrates towards green light. Therefore, the first core-shell quantum dot 1411 does not emit light, and the second core-shell quantum dot 1412 emits green light, thereby achieving the purpose of emitting red light in the red light-emitting region R and emitting green light in the green light-emitting region G.

[0103] Reference Figure 7 In the display module 100 provided in the embodiment of the present application, the first core-shell quantum dot 1411 includes a first inner core and a first shell layer, and the first shell layer wraps the first inner core; the second core-shell quantum dot 1412 includes a second inner core and a second shell layer, and the second shell layer wraps the second inner core. In a preferred embodiment thereof, the materials of the first inner core and the second inner core both include at least one of cadmium selenide, cadmium sulfide, zinc oxide, and indium sulfide, and the materials of the first shell layer and the second shell layer both include at least one of zinc sulfide, gallium arsenide, mercury sulfide, aluminum arsenide, and zinc selenide. Preferably, the materials of the first inner core and the second inner core are different, and / or the materials of the first shell layer and the second shell layer are different.

[0104] The structure and working principle of the display module 100 have been described in detail above. Based on the same inventive concept, the present application also provides a preparation method for the display module 100. The specific content of the preparation method will be described below.

[0105] Figure 8 The following shows a schematic flow chart of a preparation method for a display module provided in an embodiment of the present application. As Figure 8 shown, the embodiment of the present application also provides a preparation method for a display module. The preparation method includes the following steps:

[0106] Step S901: Provide an array substrate 110.

[0107] Step S902: Prepare a third electrode layer on one side of the array substrate 110.

[0108] Step S903: Prepare a blue light-emitting layer 120 on the side of the third electrode layer facing away from the array substrate 110.

[0109] Step S904: Prepare a first electrode layer 130 on the side of the blue light-emitting layer 120 facing away from the array substrate 110.

[0110] Among them, the third electrode layer, the blue light-emitting layer 120, and the first electrode layer 130 form a blue light-emitting device L.

[0111] Step S905: Prepare a color conversion layer 140 on the side of the first electrode layer 130 facing away from the array substrate 110.

[0112] Among them, the color conversion layer 140 includes a plurality of light conversion units, and the light conversion units contain coupled quantum dots 141.

[0113] Step S906: Prepare a second electrode layer 150 on the side of the color conversion layer 140 facing away from the array substrate 110.

[0114] Among them, the positive projections of the blue light-emitting layer 120 and the light conversion units on the array substrate 110 at least partially overlap.

[0115] In the manufacturing method provided by the embodiments of the present application, the blue light emitted by the blue light-emitting layer 120 excites a part of the light conversion units to emit red light. Under the combined action of the blue light, the first electrode layer 130, and the second electrode layer 150, another part of the light conversion units emits green light, thereby realizing full-color red, green, and blue. And because this manufacturing method only needs to prepare the coupled quantum dot material once to obtain the color conversion layer 140, that is, only one photolithography and film formation are required, thus greatly reducing the waste of materials, improving the material utilization rate, and the manufacturing process is simple and easy to operate.

[0116] It can be understood that the structures mentioned in the steps of this manufacturing method can refer to the display module 100 mentioned in any of the above embodiments. Their technical principles and the effects produced are similar, and will not be elaborated here.

[0117] Figure 9 The following shows a schematic structural diagram of a display device provided by an embodiment of the present application. As Figure 9 shown, an embodiment of the present application also provides a display device 10. The display device 10 includes the display module 100 mentioned in any of the above embodiments. Their technical principles and the effects produced are similar, and will not be elaborated here.

[0118] It can be understood that the display module 100 can also be applied to other display devices. Other display devices can be, for example, tablet computers, computer monitors, televisions, wearable devices, or information query machines, etc., any product or component with a display function.

[0119] The basic principles of the present application have been described in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. Additionally, the specific details disclosed above are only for the purposes of illustration and facilitating understanding, rather than limitations, and these details do not limit the present application to necessarily implement using the above specific details.

[0120] It should also be noted that in the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application. 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, Comprising: An array substrate; A blue light-emitting layer located on one side of the array substrate; A first electrode layer located on the side of the blue light-emitting layer facing away from the array substrate; A color conversion layer located on the side of the first electrode layer facing away from the array substrate, the color conversion layer includes a plurality of light conversion units, and the light conversion units contain coupled quantum dots; A second electrode layer located on the side of the color conversion layer facing away from the array substrate; A third electrode layer located on the side of the blue light-emitting layer close to the array substrate, and the third electrode layer, the blue light-emitting layer and the first electrode layer form a blue light-emitting device; The orthographic projection of the blue light-emitting layer and the light conversion unit on the array substrate at least partially overlaps.

2. The display module according to claim 1, wherein It further includes a packaging layer located between the first electrode layer and the color conversion layer; Preferably, the packaging layer includes a first packaging layer, a second packaging layer and a third packaging layer which are stacked in sequence; Preferably, the materials of the first packaging layer, the second packaging layer and the third packaging layer each include any one of organic materials and inorganic materials; Preferably, the first packaging layer is an inorganic material, the second packaging layer is an organic material, and the third packaging layer is an inorganic material.

3. The display module according to claim 1, wherein The coupled quantum dots include a first core-shell quantum dot and a second core-shell quantum dot which are coupled; Preferably, the first core-shell quantum dot includes a first inner core and a first shell layer, and the first shell layer wraps the first inner core; the second core-shell quantum dot includes a second inner core and a second shell layer, and the second shell layer wraps the second inner core; Preferably, the materials of the first inner core and the second inner core each include at least one of cadmium selenide, cadmium sulfide, zinc oxide and indium sulfide, and the materials of the first shell layer and the second shell layer each include at least one of zinc sulfide, gallium arsenide, mercury sulfide, aluminum arsenide and zinc selenide; Preferably, the materials of the first inner core and the second inner core are different, and / or the materials of the first shell layer and the second shell layer are different.

4. The display module according to claim 1, wherein It further includes a pixel defining layer located between the array substrate and the first electrode layer, and the pixel defining layer encloses a plurality of pixel openings, and the blue light-emitting layer is located within the pixel openings; Preferably, the display module further includes a fourth electrode layer located between the green light conversion unit and the packaging layer, and the orthographic projection of the green light conversion unit on the array substrate overlaps with the orthographic projection of the fourth electrode layer on the array substrate; Preferably, the first electrode layer is a cathode; Preferably, the third electrode layer is an anode; Preferably, the fourth electrode layer is a cathode; Preferably, the second electrode layer is made of a transparent material and is an anode.

5. The display module according to any one of claims 1 to 4, characterized in that The color conversion layer further includes a light-transmitting portion located between adjacent light conversion units; Preferably, the orthographic projection of the light conversion unit on the array substrate at least partially overlaps with the orthographic projection of the blue light-emitting layer on the array substrate; The orthographic projection of the light-transmitting portion on the array substrate at least partially overlaps with the orthographic projection of the blue light-emitting layer on the array substrate; Preferably, the display module further includes a red light-emitting region, a green light-emitting region, and a blue light-emitting region. The light conversion unit includes a red light conversion unit and a green light conversion unit. The red light conversion unit is located within the red light-emitting region, the green light conversion unit is located within the green light-emitting region, and the light-transmitting portion is located within the blue light-emitting region; Preferably, the light-transmitting portion includes scattering particles; Preferably, the scattering particles include at least one of silicon oxide particles, calcium carbonate particles, aluminum oxide particles, titanium oxide particles, and barium sulfate particles.

6. The display module according to claim 5, wherein The positive projection of the second electrode layer on the array substrate at least partially overlaps with the positive projection of the green light conversion unit on the array substrate; Preferably, the positive projection of the second electrode layer on the array substrate overlaps with the positive projection of the green light conversion unit on the array substrate; Preferably, the side of the red light conversion unit away from the array substrate does not include a second electrode layer.

7. The display module according to claim 5, wherein The color conversion layer further includes a shielding portion, the shielding portion encloses to form a plurality of openings, and the red light conversion unit, the green light conversion unit, and the light-transmitting portion are respectively arranged in the plurality of openings; Preferably, the shielding portion is black.

8. The display module according to claim 7, wherein Further includes: A filter unit, the filter unit is located on the side of the light conversion unit or the second electrode layer away from the array substrate, and the positive projection of the filter unit on the array substrate at least partially overlaps with the positive projection of the light conversion unit on the array substrate; Preferably, the positive projection of the filter unit on the array substrate overlaps with the positive projection of the light conversion unit on the array substrate; Preferably, the openings expose the filter unit; Preferably, the filter unit includes a red filter unit, a green filter unit, and a blue filter unit. The red filter unit is located on the side of the red light conversion unit away from the array substrate; the green filter unit is located on the side of the green light conversion unit away from the array substrate, and the green filter unit is located on the side of the second electrode layer away from the array substrate; the blue filter unit is located on the side of the light-transmitting portion away from the array substrate; Preferably, at least part of the filter unit and the light conversion unit are located in the same opening; Preferably, at least part of the filter unit and the light-transmitting portion are located in the same opening; Preferably, the side of the filter unit away from the array substrate is flush with the side of the shielding portion away from the array substrate.

9. A method for preparing a display module, characterized in that, Includes: Providing an array substrate; Preparing a blue light-emitting layer on one side of the array substrate; Preparing a first electrode layer on the side of the blue light-emitting layer away from the array substrate; Preparing a color conversion layer on the side of the first electrode layer away from the array substrate, the color conversion layer includes a plurality of light conversion units, and the light conversion units contain coupled quantum dots; ​ ​ The third electrode layer, the blue light-emitting layer, and the first electrode layer form a blue light-emitting device; Wherein, the positive projection of the blue light-emitting layer and the light conversion unit on the array substrate at least partially overlap.

10. A display device, characterized in that, A display module comprising the display module according to any one of claims 1 to 8 above.

Images