CN114924440A - Display back plate, manufacturing method thereof and display module - Google Patents
Display back plate, manufacturing method thereof and display module Download PDFInfo
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- CN114924440A CN114924440A CN202210423914.3A CN202210423914A CN114924440A CN 114924440 A CN114924440 A CN 114924440A CN 202210423914 A CN202210423914 A CN 202210423914A CN 114924440 A CN114924440 A CN 114924440A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
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Abstract
The embodiment of the invention discloses a display back plate, a manufacturing method thereof and a display module; the display back plate comprises a driving circuit layer, a plurality of light-emitting units positioned on one side of the driving circuit layer and a reflection function layer positioned on the driving circuit layer and on the same side as the light-emitting units, wherein the reflection function layer comprises a fully polymerized resin with a dibenzoyl succinonitrile group as an end group; according to the invention, the compound containing the dinluorenyl succinonitrile group with mechanical reactivity is introduced into the reflection functional layer, so that free radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction for prepolymerization, and after the pressure is removed, the free radicals are coupled and the polymerization is terminated, so that the exposure failure caused by direct main curing can be prevented, the prebaking link in the traditional white oil film forming process is omitted, the process time is shortened, the related equipment cost is saved, the production tact is improved, and the path for substrate transportation is reduced.
Description
Technical Field
The invention relates to the field of display, in particular to a display back plate, a manufacturing method thereof and a display module.
Background
In recent years, Micro LED or Mini LED display back plates have the advantages of fast response, high color gamut, high PPI, low energy consumption, realization of accurate dimming of ultrahigh partition number, ultrahigh contrast and the like, in order to improve display brightness and improve light extraction efficiency and reduce energy consumption, one method is to improve the overall reflectivity, a layer of high-reflectivity white oil is coated on a driving circuit layer to serve as a reflection functional layer, and in the traditional white oil film forming process, a pre-baking and pre-polymerizing link is provided, the equipment of the link is complex, baking time is required, and production efficiency is reduced.
Therefore, a display backplane, a manufacturing method thereof, and a display module are needed to solve the above technical problems.
Disclosure of Invention
The invention provides a display back plate, a manufacturing method thereof and a display module, which can solve the technical problems that in the traditional white oil film forming process, equipment with a pre-baking and pre-polymerizing link is complex, baking time is needed, and production efficiency is low.
The invention provides a display back plate, comprising:
a drive line layer;
a plurality of light emitting cells positioned at one side of the driving line layer;
the reflection functional layer is positioned on the driving circuit layer and is positioned at the same side as the light-emitting unit;
wherein the reflective functional layer comprises a fully polymerized resin terminated with a difluorenylsuccinonitrile group.
Preferably, the fully polymerized resin having the dibenzoyl succinonitrile group as an end group is a fully polymerized carboxyl group-containing photosensitive resin having the dibenzoyl succinonitrile group as an end group.
Preferably, the reflective function layer further comprises a reflective component and a flowable function component; wherein the flowable functional component comprises a solid subcomponent and a functional filler subcomponent.
Preferably, the reflective component comprises titanium dioxide, the solid sub-component comprises a silicon oxy-compound or/and a metal oxide, and the functional filler sub-component is a silicone oil.
Preferably, the mass fraction of the fully polymerized carboxyl group-containing photosensitive resin having a dibenzoyl succinonitrile group as a terminal group in the reflective function layer is 80 to 90%; the reflecting component accounts for 5 to 7 percent of the mass of the reflecting functional layer; the mass fraction of the solid sub-component in the reflection function layer is 1.6-3%; the functional filler subcomponents account for 0.1 to 0.2 percent of the mass fraction of the reflection functional layer.
Preferably, the mass fraction of the difluorenyl succinonitrile group in the corresponding fully polymerized and carboxyl group-containing photosensitive resin is 3% to 18%.
The invention also provides a manufacturing method of the display back plate, which comprises the following steps:
providing a substrate;
forming a driving circuit layer on one side of the substrate;
providing a reflection functional material comprising a carboxyl group-containing photosensitive resin, a bifluorenyl succinonitrile group-containing compound, and a solvent;
and silk-screen printing the reflection functional material on the side, far away from the substrate, of the driving circuit layer by using a silk-screen printing process, and extruding the reflection functional material to enable the compound containing the dibenzoyl succinonitrile group to generate free radicals so as to carry out prepolymerization.
Preferably, the step of pressing the reflective functional material comprises: and pressing the reflection function material with a pressure of 1000N to 7000N.
Preferably, the step of providing a reflective functional material including a carboxyl group-containing photosensitive resin, a dibenzoyl succinonitrile group-containing compound, and a solvent includes: providing a reflection functional material comprising a carboxyl group-containing photosensitive resin, a bifluorenyl succinonitrile group-containing compound, an azoalkane crosslinking agent and a solvent; the step of screen-printing the reflection functional material on the side, far away from the substrate, of the driving circuit layer by using a screen printing process, and extruding the reflection functional material to enable the compound containing the dibenzoyl succinonitrile group to generate radicals so as to perform prepolymerization comprises the following steps: and (3) silk-screening the reflection functional material on the side, far away from the substrate, of the driving circuit layer by using a silk-screen process, and extruding the reflection functional material to enable the compound containing the difluorenyl succinonitrile group and the azoalkane cross-linking agent to generate free radicals so as to carry out prepolymerization.
The invention also provides a display module comprising any one of the display back plates.
The invention has the beneficial effects that: according to the invention, the compound containing the bifluorenyl succinonitrile group with mechanical reactivity is introduced into the reflection function layer, so that free radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction, prepolymerization is carried out, and after the pressure is removed, the free radicals are coupled and the polymerization is terminated, so that not only can the exposure failure caused by direct main curing be prevented, but also the prebaking link in the traditional white oil film forming process is omitted, the process time is reduced, the related equipment cost is saved, the production tact is improved, and the path for substrate transportation is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a first structure of a display backplane according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for fabricating a display backplane according to an embodiment of the present invention;
fig. 3A and 3B are schematic flow charts illustrating a method for manufacturing a display backplane according to an embodiment of the present invention;
fig. 4A and 4B are schematic flow charts of a method for manufacturing a display backplane according to an embodiment of the disclosure;
FIG. 5 is a schematic structural diagram of a display module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are not intended to limit the present invention. In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" generally means upper and lower in the actual use or operation of the device, particularly in the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
In recent years, Micro LED or Mini LED display back plates have the advantages of fast response, high color gamut, high PPI, low energy consumption, realization of accurate dimming of ultrahigh partition number, ultrahigh contrast and the like, in order to improve display brightness and improve light extraction efficiency and reduce energy consumption, one method is to improve the overall reflectivity, a layer of high-reflectivity white oil is coated on a driving circuit layer to serve as a reflection functional layer, and in the traditional white oil film forming process, a pre-baking and pre-polymerizing link is provided, the equipment of the link is complex, baking time is required, and production efficiency is reduced.
Referring to fig. 1, an embodiment of the invention provides a display backplane 100, including:
a driving circuit layer 200;
a plurality of light emitting cells 300 on one side of the driving line layer 200;
a reflective function layer 400 on the driving line layer 200 and on the same side as the light emitting unit 300;
wherein the reflective functional layer 400 comprises a fully polymerized resin terminated with a dibenzoyl succinonitrile group.
According to the invention, the compound containing the dinluorenyl succinonitrile group with mechanical reactivity is introduced into the reflection functional layer, so that free radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction for prepolymerization, and after the pressure is removed, the free radicals are coupled and the polymerization is terminated, so that the exposure failure caused by direct main curing can be prevented, the prebaking link in the traditional white oil film forming process is omitted, the process time is shortened, the related equipment cost is saved, the production tact is improved, and the path for substrate transportation is reduced.
The technical solution of the present invention will now be described with reference to specific embodiments.
In this embodiment, referring to fig. 1, the display backplane 100 includes a driving circuit layer 200, a plurality of light emitting units 300 located at one side of the driving circuit layer 200, and a reflective function layer 400 located on the driving circuit layer 200 and at the same side as the light emitting units 300; wherein the reflective functional layer 400 comprises a fully polymerized resin terminated with a dibenzoyl succinonitrile group.
The compound containing the dibenzoyl group succinonitrile group has mechanical reactivity, and can generate free radicals when an external force extrudes the compound containing the dibenzoyl group succinonitrile group, and the principle is as follows:
therefore, by using the principle, when the reflective function layer 400 is manufactured, radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction for prepolymerization, and after the pressure is removed, the radicals are coupled and the polymerization is terminated, so that the exposure failure caused by direct main curing can be prevented, the prebaking link in the traditional white oil film forming process is saved, the process time is shortened, the related equipment cost is saved, the production takt is improved, and the path for substrate transportation is reduced.
In some embodiments, the fully polymerized resin terminated with a dibenzoenyl succinonitrile group is a fully polymerized carboxyl-containing photosensitive resin terminated with a dibenzoenyl succinonitrile group.
The fully polymerized resin with the dibenzoyl succinonitrile group as the end group contains carboxyl, so that exposure and development conditions can be provided, and after the reflection function layer 400 is patterned by a silk-screen printing process, the exposure and development can be continued to perform fine pattern control, so that the reflection effect is improved, and the light-emitting unit 300 is prevented from being shielded.
In some embodiments, the reflective functional layer 400 further comprises a reflective component, and a flowable functional component; wherein the flowable functional component comprises a solid subcomponent and a functional filler subcomponent.
The components of the reflective function layer 400 can reflect light, and adjust fluidity, so as to better realize fine control of patterning of the reflective function layer 400 and realize reflection points of predetermined functions.
In some embodiments, the reflective component comprises titanium dioxide, the solid subcomponent comprises a silicone compound or/and a metal oxide, and the functional filler subcomponent is a silicone oil.
The reflective component includes titanium dioxide, which can provide better reflective effect, the solid sub-component includes silicon oxide compound or/and metal oxide, such as silicon dioxide, etc., the state of the solid sub-component can be powder state, which can be made by thermal decomposition method, the functional filler sub-component is silicon oil, which can control flow property and facilitate silk-screen printing.
In some embodiments, the fully polymerized and carboxyl-containing photosensitive resin terminated with a dibenzoyl succinonitrile group accounts for 80 to 90% by mass of the reflective functional layer 400; the reflection component accounts for 5 to 7 mass percent of the reflection function layer 400; the mass fraction of the solid sub-component in the reflective functional layer 400 is 1.6% to 3%; the functional filler subcomponent accounts for 0.1 to 0.2 mass% of the reflective functional layer 400.
In the final product, in the reflective function layer 400, the fully polymerized and carboxyl-containing photosensitive resin with the dibenzoyl succinonitrile group as the terminal group is mainly used, and occupies most of the specific gravity, the reflective component is also partly used as the main body of the reflective function, and the fluidity can be adjusted by a small proportion of the solid subcomponent to the functional filler subcomponent.
In some embodiments, the mass fraction of the difluorenylsuccinonitrile groups in the corresponding fully polymerized and carboxyl-containing photosensitive resin is 3% to 18%.
The insertion ratio of the difluorenyl succinonitrile group to the completely polymerized carboxyl-containing photosensitive resin is 3% to 18%, and when the display back plate 100 is manufactured, the formation of free radicals can be met, prepolymerization is realized, excessive free radicals cannot be generated, subsequent main curing is not influenced, and the reflection function performance of the reflection function layer 400 is ensured.
In some embodiments, the reflective component further includes a residual solvent, the residual solvent includes any one or more of benzotriazole, isophorone, and diacetone alcohol, and the mass fraction of the residual solvent in the reflective functional layer 400 is about 0.005%. The content in the final product is negligible.
In some embodiments, the residual solvent may also include any one or combination of triethylene glycol diacrylate, benzoin ethyl ether, acetophenone, 4' -dimethyl aminobenzophenone, triethylene glycol dimethacrylate, diethylene glycol diacrylate, any of which may be used as a solvent in the manufacture, again in negligible amounts in the final product.
In some embodiments, referring to fig. 1, the display backplane 100 further includes a plurality of electrical connection units 500 located between the driving circuit layer 200 and the light emitting units 300, and the electrical connection units 500 are electrically connected to the driving circuit layer 200 and the light emitting units 300.
In some embodiments, referring to fig. 1, the electrical connection unit 500 includes a bonding pad 510 near one side of the driving circuit layer 200 and a solder tail 520 near one side of the light emitting unit 300.
In some embodiments, the display back plate 100 may serve as a backlight of the display module 10, and may also serve as a direct display of the display module 10, which is not limited herein.
In some embodiments, the light emitting unit 300 may include a Micro LED or a Mini LED, which is not particularly limited herein.
In some embodiments, the display backplane 100 further includes a substrate 110 located on a side of the driving line layer 200 away from the light emitting unit 300, and the driving line layer 200 includes an active layer located on the substrate 110, a first insulating layer located on the active layer, a gate layer located on the first insulating layer, a second insulating layer located on the gate layer, a source drain layer located on the second insulating layer, and a third insulating layer located on the source drain layer. The third insulating layer includes a plurality of via holes, and the pad 510 is electrically connected to the source drain layer through the via holes.
According to the invention, the compound containing the dinluorenyl succinonitrile group with mechanical reactivity is introduced into the reflection functional layer, so that free radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction for prepolymerization, and after the pressure is removed, the free radicals are coupled and the polymerization is terminated, so that the exposure failure caused by direct main curing can be prevented, the prebaking link in the traditional white oil film forming process is omitted, the process time is shortened, the related equipment cost is saved, the production tact is improved, and the path for substrate transportation is reduced.
Referring to fig. 2, an embodiment of the present invention further provides a method for manufacturing a display backplane 100, including:
s100, a substrate 110 is provided.
And S200, forming a driving line layer 200 on one side of the substrate 110.
S300, providing a reflection functional material 401 comprising a carboxyl-containing photosensitive resin, a bifluorenyl succinonitrile group-containing compound and a solvent.
S400, silk-screen printing the reflection functional material 401 on the side, far away from the substrate 110, of the driving line layer 200 by using a silk-screen printing process, and extruding the reflection functional material 401 to enable the compound containing the dibenzoyl succinonitrile group to generate radicals so as to perform prepolymerization.
According to the invention, the compound containing the bifluorenyl succinonitrile group with mechanical reactivity is introduced into the reflection function layer, so that free radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction, prepolymerization is carried out, and after the pressure is removed, the free radicals are coupled and the polymerization is terminated, so that not only can the exposure failure caused by direct main curing be prevented, but also the prebaking link in the traditional white oil film forming process is omitted, the process time is reduced, the related equipment cost is saved, the production tact is improved, and the path for substrate transportation is reduced.
The technical solution of the present invention will now be described with reference to specific embodiments.
In this embodiment, the manufacturing method of the display back panel 100 includes:
s100, a substrate 110 is provided, please refer to fig. 3A.
In some embodiments, the material of the substrate 110 may be a hard material, such as glass, or a flexible material, such as polyimide, and is not limited herein.
S200, forming a driving circuit layer 200 on one side of the substrate 110, please refer to fig. 3A.
In some embodiments, the display backplane 100 further includes a substrate 110 located on a side of the driving line layer 200 away from the light emitting unit 300, and the driving line layer 200 includes an active layer located on the substrate 110, a first insulating layer located on the active layer, a gate layer located on the first insulating layer, a second insulating layer located on the gate layer, a source drain layer located on the second insulating layer, and a third insulating layer located on the source drain layer. The third insulating layer includes a plurality of via holes, and the pad 510 is electrically connected to the source drain layer through the via holes.
S300, providing a reflective material 401 comprising a carboxyl group-containing photosensitive resin, a dibenzoyl group-containing succinonitrile group-containing compound, and a solvent, as shown in fig. 3B.
In some embodiments, step S300 further includes:
s310a, providing a reflective functional material 401 comprising a carboxyl group-containing photosensitive resin, a bifluorenyl succinonitrile group-containing compound, and a solvent.
In some embodiments, the solvent may include a first functional agent, a second functional agent, and a third functional agent; the first functional agent is used as a cross-linking agent and comprises any one or combination of more of diethylene glycol diacrylate, triethylene glycol dimethacrylate and diethylene glycol diacrylate; the second functional agent is used as a photosensitizer and a cosolvent and comprises any one or combination of benzoin ethyl ether, acetophenone and 4,4' -dimethylamino benzophenone; the third functional agent is used as a leveling agent and a cosolvent; including any one or a combination of more of benzotriazole, isophorone, diacetone alcohol.
In some embodiments, the reflective functional material 401 further comprises a reflective component, and a flowable functional component;
wherein the flowable functional component comprises a solid subcomponent and a functional filler subcomponent.
The reflecting component comprises titanium dioxide, the solid sub-component comprises a silica compound or/and a metal oxide, and the functional filler sub-component is silicone oil.
In some embodiments, the mass fraction of the compound containing a dibenzoyl succinonitrile group and the photosensitive resin containing a carboxyl group in the reflective functional material 401 is 50% to 60%; the reflecting component accounts for 3 to 8 percent of the mass fraction of the reflecting functional material 401; the mass fraction of the solid sub-component in the reflection functional material 401 is 0.06% to 0.1%; the functional filler subcomponent accounts for 0.01 to 0.1 percent of the mass fraction of the reflective functional material 401; the first functional agent accounts for 5-15% of the mass fraction of the reflection functional material 401; the second functional agent accounts for 3-6% of the reflection functional material 401 by mass; the third functional agent accounts for 0.03-0.07% of the mass fraction of the reflection functional material 401; preferably, the third functional agent accounts for 0.05% of the mass fraction of the reflection functional material 401.
In some embodiments, the dibenzoyl succinonitrile group containing compound can be synthesized by the following α and β steps, which are given as examples only:
synthesis of alpha, 5, 6-dihydroxyhexyl methacrylate: 01.0M H2 aqueous SO4 solution (400mL) was added dropwise to THF (80mL) which had been mixed in advance with (4-oxacycloalkylbutyl) methacrylate (23.6g, 128.0 mmol). The reaction mixture was stirred for 5 hours. After slow neutralization with aqueous potassium carbonate (10 wt%), the resulting mixture was extracted with ethyl acetate, the organic layer was washed with brine, dried over anhydrous MgSO4/Na2SO4, and the solvent was removed. The crude product was purified by column chromatography on silica eluting with ethyl acetate/n-hexane (volume ratio: 3/1). The solvent was removed and dried in vacuo to give the compound 5, 6-dihydroxyhexyl methacrylate as a clear liquid. The reaction equation is as follows:
synthesis of a macromolecular prepolymer, poly (propylene oxide) (PTMO; Mn ═ 1020) (3.12g, 3.06mmol) was added to the sample reaction tube and dried under vacuum at 70 ℃ for 3 h. Then, difluorenylsuccinonitrile-diol (0.446g, 1.012mmol), N, N-dimethylacetamide (DMAc) (50mL), 5, 6-dihydroxyhexyl methacrylate (0.836g, 4.14mmol) and dicyclohexylmethane 4,4' -diisocyanate (HMDI) (3.90g, 14.88mmol) were added to the sample reaction tube. After a nitrogen sweep for 6 hours, di-n-butyltin dilaurate (DBTDL) (1 drop) was added to the mixture with mechanical stirring. After stirring at room temperature for 5 hours, 1, 4-Butanediol (BDO) (0.70g, 7.76mmol) was added to the above mixture under nitrogen blanket, and the mixture was stirred at room temperature for 72 hours. Finally, 0.5-1.0 mL of methanol is dripped into the reaction system to terminate the reaction. The crude product was purified by precipitation three times in methanol, washed with hexane and dried in vacuo. Mn and Mw/Mn values were determined by SEC with polystyrene standards. Mn is 5000 and Mw/Mn is 1.79. The reaction equation is as follows:
in some embodiments, step S300 further includes:
s310b, providing a reflective functional material 401 comprising a carboxyl group-containing photosensitive resin, a bifluorenyl succinonitrile group-containing compound, an azoalkane crosslinking agent, and a solvent.
S400, silk-screen printing the reflection functional material 401 on the side, far away from the substrate 110, of the driving line layer 200 by using a silk-screen printing process, and extruding the reflection functional material 401 to enable the compound containing the dibenzoyl succinonitrile group to generate radicals so as to perform prepolymerization.
In some embodiments, the principle of extruding the reflective functional material 401 to generate a free radical from the compound containing a dibenzoyl succinonitrile group is as follows:
in some embodiments, step S400 includes:
s410a, screen-printing the reflection functional material 401 on the side, far away from the substrate 110, of the driving line layer 200 by using a screen printing process, and extruding the reflection functional material 401 to enable the compound containing the dibenzoyl succinonitrile group to generate radicals so as to perform prepolymerization.
In some embodiments, the step of pressing the reflective functional material 401 in the step S410a includes: and the reflective functional material 401 is pressed at a pressure of 1000N to 7000N.
The extrusion force is controlled, the generation amount and generation speed of free radicals are controlled, the prepolymerization speed can be controlled, and the manufacturing process is optimized.
In some embodiments, step S400 includes:
S410B, screen-printing the reflective material 401 on the side of the driving circuit layer 200 away from the substrate 110 by using a screen printing process, and extruding the reflective material 401 to generate radicals from the compound containing the dibenzoyl succinonitrile group and the azoalkane cross-linking agent for prepolymerization, as shown in fig. 3B.
The azoalkane cross-linking agent is added into the system, the azoalkane cross-linking agent can reduce the yield stress, the concentration of free radicals under the action of mechanical force can be obviously improved, and the action is far away from the following:
azo-based crosslinking agents, for example, azo compounds, which contain an azo group-N ═ N-in the molecular structure and to which two alkyl groups (R, R') are bonded. The general formula is R-N ═ N-R', and the azoalkane cross-linking agent can generate free radicals under the action of pressure, wherein the mass fraction of the azoalkane cross-linking agent in the reflection functional material 401 is 3% -8%.
S420, removing the extrusion force to couple the free radicals, terminating the prepolymerization, and forming a first pattern 410, please refer to FIG. 4A.
When the reflection function layer 400 is manufactured, free radicals can be generated under the pressure effect when a steel mesh is pressed down in a silk-screen printing stage at room temperature to initiate prepolymerization reaction, prepolymerization is carried out, after the pressure is removed, the free radicals are coupled, and polymerization is terminated, so that exposure failure caused by direct main curing can be prevented, a prebaking link in the traditional white oil film forming process is omitted, the process time is shortened, the cost of related equipment is saved, the production takt is improved, and the path for substrate transportation is reduced.
S430, exposing and developing the first pattern 410 to form a second pattern 420, please refer to fig. 4B.
In some embodiments, after exposure and development, the second pattern 420 is more refined than the first pattern 410, which is beneficial for the conductive precision stability.
S440, performing main curing on the second pattern 420 to form the reflective function layer 400, as shown in fig. 4B.
In some embodiments, the main curing may be thermal curing, and the specific heating temperature and heating time may be set according to different situations, and are not particularly limited herein.
In some embodiments, the method for manufacturing the display backplane 100 further includes:
s500, forming a plurality of pads 510 on the driving circuit layer 200, please refer to fig. 1.
S600, providing a plurality of light emitting units 300, and forming two solder tails 520 at corresponding positions on the light emitting units 300, please refer to fig. 1.
In some embodiments, the material content of the solder leg 520 may be similar to the material content of the solder pad 510, and may be adjusted according to actual conditions.
S700, aligning and electrically connecting the solder tails 520 and the solder pads 510, please refer to fig. 1.
In some embodiments, step 700 may be thermal welding, etc., which may be set according to different situations and is not specifically limited herein.
In some embodiments, the light emitting unit 300 may include a Micro LED or a Mini LED, which is not particularly limited herein.
In some embodiments, the display backplane 100 further includes a substrate 110 located on a side of the driving line layer 200 away from the light emitting unit 300, and the driving line layer 200 includes an active layer located on the substrate 110, a first insulating layer located on the active layer, a gate layer located on the first insulating layer, a second insulating layer located on the gate layer, a source drain layer located on the second insulating layer, and a third insulating layer located on the source drain layer. The third insulating layer includes a plurality of via holes, and the pad 510 is electrically connected to the source drain layer through the via holes.
According to the invention, the compound containing the dinluorenyl succinonitrile group with mechanical reactivity is introduced into the reflection functional layer, so that free radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction for prepolymerization, and after the pressure is removed, the free radicals are coupled and the polymerization is terminated, so that the exposure failure caused by direct main curing can be prevented, the prebaking link in the traditional white oil film forming process is omitted, the process time is shortened, the related equipment cost is saved, the production tact is improved, and the path for substrate transportation is reduced.
Referring to fig. 5, an embodiment of the invention further provides a display module 10 including the display back plate 100 as described above.
In this embodiment, the display module 10 may be a liquid crystal display module 10, or may be a self-luminous display module 10. That is, the display back plate 100 can be used as a backlight module of the liquid crystal display module 10, and can also be used as a display device of the self-luminous display module 10.
In some embodiments, the display module 10 may be a liquid crystal display module 10, and the display module 10 further includes a liquid crystal layer, a color film layer, and upper and lower polarizer layers.
Referring to fig. 6, an embodiment of the present invention further provides a display device 1, including any one of the display modules 10 and a device main body 2, where the device main body 2 and the display module 10 are combined into a whole.
For the specific structures of the display module 10 and the display back plate 100, please refer to any of the embodiments and drawings of the display module 10 and the display back plate 100, which are not described herein again.
In this embodiment, the device main body 2 may include a middle frame, frame glue, and the like, and the display device 1 may be a display terminal such as a mobile phone, a flat panel, a television, and the like, which is not limited herein.
The embodiment of the invention discloses a display back plate, a manufacturing method thereof and a display module; the display back plate comprises a driving circuit layer, a plurality of light-emitting units and a reflection functional layer, wherein the light-emitting units are positioned on one side of the driving circuit layer, the reflection functional layer is positioned on the driving circuit layer and is positioned on the same side as the light-emitting units, and the reflection functional layer comprises a fully polymerized resin with a dibenzoyl group succinonitrile group as an end group; according to the invention, the compound containing the dinluorenyl succinonitrile group with mechanical reactivity is introduced into the reflection functional layer, so that free radicals can be generated under the pressure effect when the steel mesh is pressed down in the silk-screen printing stage at room temperature to initiate prepolymerization reaction for prepolymerization, and after the pressure is removed, the free radicals are coupled and the polymerization is terminated, so that the exposure failure caused by direct main curing can be prevented, the prebaking link in the traditional white oil film forming process is omitted, the process time is shortened, the related equipment cost is saved, the production tact is improved, and the path for substrate transportation is reduced.
The display back plate, the manufacturing method thereof and the display module provided by the embodiment of the invention are described in detail, specific examples are applied to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for those skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as limiting the present invention.
Claims (10)
1. A display backplane, comprising:
a driving circuit layer;
a plurality of light emitting cells positioned at one side of the driving line layer;
the reflection functional layer is positioned on the driving circuit layer and is positioned on the same side as the light-emitting unit;
wherein the reflective functional layer comprises a fully polymerized resin terminated with a dibenzoyl succinonitrile group.
2. The display backplane of claim 1, wherein the fully polymerized resin terminated with a dibenzoyl succinonitrile group is a fully polymerized and carboxyl-containing photosensitive resin terminated with a dibenzoyl succinonitrile group.
3. The display backplane of claim 2, wherein the reflective functional layer further comprises a reflective component, and a flowable functional component;
wherein the flowable functional component comprises a solid subcomponent and a functional filler subcomponent.
4. A display backplane according to claim 3, characterized in that the reflective component comprises titanium dioxide, the solid sub-component comprises a silicone compound or/and a metal oxide, and the functional filler sub-component is silicone oil.
5. The display backsheet according to claim 4, wherein the fully polymerized carboxyl group-containing photosensitive resin having a dibenzoyl succinonitrile group as a terminal group accounts for 80 to 90% by mass of the reflective functional layer;
the reflecting component accounts for 5 to 7 percent of the mass fraction of the reflecting functional layer;
the mass fraction of the solid sub-component in the reflection function layer is 1.6-3%;
the functional filler subcomponents account for 0.1 to 0.2 percent of the mass fraction of the reflection functional layer.
6. The display backplane of claim 2, wherein the mass fraction of the difluorenylsuccinonitrile groups to the corresponding fully polymerized and carboxyl group-containing photosensitive resin is 3% to 18%.
7. A manufacturing method of a display back plate is characterized by comprising the following steps:
providing a substrate;
forming a driving circuit layer on one side of the substrate;
providing a reflection functional material comprising a carboxyl group-containing photosensitive resin, a bifluorenyl succinonitrile group-containing compound, and a solvent;
and silk-screen printing the reflection functional material on the side, far away from the substrate, of the driving circuit layer by using a silk-screen printing process, and extruding the reflection functional material to enable the compound containing the dibenzoyl succinonitrile group to generate free radicals so as to carry out prepolymerization.
8. The method for manufacturing a display backplane according to claim 7, wherein the step of pressing the reflective functional material comprises:
and pressing the reflection functional material with the pressure of 1000N to 7000N.
9. The method of claim 7, wherein the step of providing a reflective material comprising a carboxyl group-containing photosensitive resin, a dibenzoyl group-containing succinonitrile group-containing compound, and a solvent comprises:
providing a reflective functional material comprising a carboxyl-containing photosensitive resin, a compound containing a dibenzoyl succinonitrile group, an azoalkane crosslinking agent, and a solvent;
the step of screen-printing the reflection functional material on the side, far away from the substrate, of the driving circuit layer by using a screen printing process, and extruding the reflection functional material to enable the compound containing the dibenzoyl succinonitrile group to generate radicals so as to perform prepolymerization comprises the following steps:
and (3) silk-screening the reflection functional material on the side, far away from the substrate, of the driving circuit layer by using a silk-screen process, and extruding the reflection functional material to enable the compound containing the difluorenyl succinonitrile group and the azoalkane cross-linking agent to generate free radicals so as to carry out prepolymerization.
10. A display module comprising the display backplane of any one of claims 1 to 6.
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| CN202210423914.3A CN114924440A (en) | 2022-04-21 | 2022-04-21 | Display back plate, manufacturing method thereof and display module |
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| CN113621125A (en) * | 2021-08-24 | 2021-11-09 | Tcl华星光电技术有限公司 | Mechanical response polymer, preparation method thereof, frame glue material and liquid crystal display panel |
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