CN111258111A - Color film substrate, preparation method thereof and display panel - Google Patents
Color film substrate, preparation method thereof and display panel Download PDFInfo
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- CN111258111A CN111258111A CN202010189913.8A CN202010189913A CN111258111A CN 111258111 A CN111258111 A CN 111258111A CN 202010189913 A CN202010189913 A CN 202010189913A CN 111258111 A CN111258111 A CN 111258111A
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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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
- G02F1/133516—Methods for their manufacture, e.g. printing, electro-deposition or photolithography
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
Abstract
The application discloses a color film substrate, a preparation method thereof and a display panel, which are used for improving the resolution of a display product. The color film substrate provided by the embodiment of the application comprises: the pixel structure comprises a substrate and sub-pixel regions arranged in an array manner on the substrate; at least part of the sub-pixel regions include: the euphotic layer is provided with a groove, and the quantum dot microspheres are positioned in the groove and correspond to the light emitting color of the sub-pixel area; the width of the groove is larger than the diameter of the quantum dot microsphere in the groove.
Description
Technical Field
The application relates to the technical field of display, in particular to a color film substrate, a manufacturing method thereof and a display panel.
Background
With the continuous development of display technology, people have higher and higher requirements on the display quality of display devices. The quantum dot material has the advantages of concentrated light emission spectrum, high color purity, simple and easy adjustment of light emission color through the size, structure or components of the quantum dot material and the like, and in recent years, the quantum dot color film is used for improving the color gamut of a display product so as to improve the display effect.
In the prior art, a quantum dot color film is usually formed on a substrate, however, in the process of forming the quantum dot color film, the quantum dot color film with the micron-sized thickness cannot be prepared in a photoetching manner due to the limitation of ultraviolet light absorption characteristics of quantum dots, and although the quantum dot color film with the micron-sized thickness can be prepared in an ink-jet printing manner, the quantum dot color film is limited by the precision and materials of a printer nozzle, the upper limit of pixel density (PPI) is about 200PPI, and the display requirement of higher resolution cannot be met.
In conclusion, the prior art quantum dot color film substrate cannot meet the display requirement of high resolution.
Disclosure of Invention
The embodiment of the application provides a color film substrate, a preparation method thereof and a display panel, which are used for improving the resolution of a display product.
The color film substrate provided by the embodiment of the application comprises: the pixel structure comprises a substrate and sub-pixel regions arranged in an array manner on the substrate;
at least part of the sub-pixel regions include: the euphotic layer is provided with a groove, and the quantum dot microspheres are positioned in the groove and correspond to the light emitting color of the sub-pixel area; the width of the groove is larger than the diameter of the quantum dot microsphere in the groove.
The color film substrate provided by the embodiment of the application utilizes the quantum dot microspheres as the color film layer, and the quantum dot microspheres are arranged in the grooves of the light-transmitting layer, so that the pixel density of a display product can be changed by adjusting the size of the grooves and the diameter of the corresponding quantum dot microspheres, the requirement of the resolution ratio of the display product can be met while the color gamut of the display product is improved, and the user experience is improved.
Optionally, the sub-pixel region includes: a first color sub-pixel region and a second color sub-pixel region;
the first color sub-pixel region includes: the first color quantum dot microsphere and the first groove;
the second color sub-pixel region includes: the second color quantum dot microspheres and a second groove;
the diameter of the first color quantum dot microsphere is smaller than that of the second color quantum dot microsphere.
Optionally, the first groove and the second groove are located in the same light-transmitting layer;
the width of the first groove is smaller than the diameter of the second quantum dot microsphere.
In the color film substrate provided by the embodiment of the application, the first groove is only located in the first light-transmitting sublayer, and the subsequently formed second light-transmitting sublayer located on the first light-transmitting sublayer covers the first quantum dot microspheres and fills the gap between the first quantum dot microspheres and the first groove to fix the first quantum dot microspheres. And the total thickness of the first light-transmitting sublayer and the second light-transmitting sublayer is larger than the diameter of the first quantum dot microsphere, so that the first quantum dot microsphere can be prevented from being damaged in the process of forming the second groove by a subsequent patterning process.
Optionally, the light-transmitting layer includes a first light-transmitting sublayer and a second light-transmitting sublayer located on a side of the first light-transmitting sublayer away from the substrate;
the first groove is located in the first photon transmission layer, and the second groove is located in the second light transmission sublayer and the first photon transmission layer.
Optionally, the first color sub-pixel region is a red sub-pixel region, and the second color sub-pixel region is a green sub-pixel region; the first color quantum dot microspheres are red quantum dot microspheres, and the second color quantum dot microspheres are green quantum dot microspheres;
the sub-pixel region further comprises a blue sub-pixel region;
the color film substrate is incident with blue light, and the blue sub-pixel region comprises a third groove penetrating through the light transmission layer;
or, the color film substrate emits white light, and the blue sub-pixel region includes: blue light quantum dot microballon and third recess.
Optionally, the color filter substrate further includes: and the light-transmitting packaging layer is positioned on one side of the light-transmitting layer, which is far away from the substrate.
Optionally, the quantum dot microsphere comprises: high polymer microspheres and quantum dots injected into the high polymer microspheres.
Optionally, the surface of the groove close to the substrate base plate is a spherical surface;
or the light-transmitting layer is provided with a plurality of light-transmitting substructures in the region where the groove covers the light-transmitting layer; the thickness of the photon-transmitting structure is smaller than that of the light-transmitting layer, and the thickness of the photon-transmitting structure is gradually increased along the direction in which the groove is perpendicular to the symmetrical axis of the substrate base plate and points to the side surface of the groove.
According to the color film substrate provided by the embodiment of the application, the bottom surface of the groove is a spherical surface, or the bottom surface of the groove points to the side surface of the groove along the symmetry axis of the substrate perpendicular to the groove, and the thickness of the photon transmission structure is gradually increased, so that the shape of the bottom surface of the groove is closer to that of the quantum dot microspheres, and the quantum dot microspheres can be filled into the groove.
The preparation method of the color film substrate provided by the embodiment of the application comprises the following steps:
providing a substrate base plate;
and forming a light transmitting layer on the substrate, forming a groove on the light transmitting layer of the sub-pixel region where the quantum dot microspheres need to be arranged, and filling the quantum dot microspheres corresponding to the light emitting color of the sub-pixel region into the groove through a self-assembly process.
According to the color film substrate manufacturing method provided by the embodiment of the application, the euphotic layer is arranged on the substrate, the groove is formed in the euphotic layer, so that quantum dot microspheres serving as the color film layer are accommodated, the groove can be filled with the quantum dot microspheres through a fluid self-assembly process subsequently, the pixel density of a display product can be changed by adjusting the size of the groove and the diameter of the corresponding quantum dot microspheres, the requirement of the resolution ratio of the display product can be met while the color gamut of the display product is improved, and the user experience is improved.
Optionally, the sub-pixel region includes: a first color sub-pixel region and a second color sub-pixel region; forming a light transmission layer on the substrate, and forming a groove for accommodating the quantum dot microspheres on the light transmission layer of the sub-pixel region where the quantum dot microspheres need to be arranged, specifically comprising:
forming a first light-transmitting sublayer on the substrate;
and forming a first groove on the first light-transmitting sublayer of the first color sub-pixel region and a second groove on the first light-transmitting sublayer of the second color sub-pixel region by adopting a patterning process, wherein the width of the first groove is smaller than that of the second groove.
Optionally, filling the quantum dot microspheres corresponding to the light emitting color of the sub-pixel region into the groove by a self-assembly process, specifically including:
placing the substrate base plate with the first groove and the second groove in a second color quantum dot microsphere solution, and controlling the second color quantum dot microsphere solution to flow so that the second color quantum dot microsphere is filled into the second groove;
placing the substrate base plate filled with the second color quantum dot microspheres in a first color quantum dot microsphere solution, and controlling the first color quantum dot microsphere solution to flow so as to fill the first color quantum dot microspheres into the first grooves;
the diameter of the first color quantum dot microsphere is smaller than that of the second color quantum dot microsphere, and the diameter of the second color quantum dot microsphere is larger than the width of the first groove.
Optionally, the sub-pixel region includes: a first color sub-pixel region and a second color sub-pixel region; forming a light transmission layer on the substrate, and forming a groove for accommodating the quantum dot microspheres on the light transmission layer of the sub-pixel region where the quantum dot microspheres need to be arranged, specifically comprising:
forming a first light-transmitting sublayer on the substrate;
forming a first groove on a first light-transmitting sub-layer of the first color sub-pixel region by adopting a patterning process;
forming a second light-transmitting sublayer over the first light-transmitting sublayer;
and forming a second groove on the first light-transmitting sublayer and the second light-transmitting sublayer of the second color sub-pixel region by adopting a patterning process.
Optionally, filling the quantum dot microspheres corresponding to the light emitting color of the sub-pixel region into the groove by a self-assembly process, specifically including:
before a second light-transmitting sub-layer is formed on the first light-transmitting sub-layer, placing a substrate in a first color quantum dot microsphere solution, and controlling the first color quantum dot microsphere solution to flow so as to fill the first color quantum dot microspheres into the first groove;
after a second groove is formed in the first light-transmitting sub-layer and the second light-transmitting sub-layer of the second color sub-pixel region by adopting a patterning process, the substrate base plate is placed in a second color quantum dot microsphere solution, and the flow of the second color quantum dot microsphere solution is controlled, so that the second groove is filled with the second color quantum dot microspheres.
Optionally, after filling the quantum dot microspheres corresponding to the light emitting colors of the sub-pixel regions into the grooves by a self-assembly process, the method further includes:
and forming a light-transmitting packaging layer on one side of the light-transmitting layer, which is far away from the substrate.
An embodiment of the present application provides a display panel, display panel includes: the color film substrate and the array substrate are arranged opposite to the color film substrate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a color film substrate according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another color film substrate provided in this embodiment of the present application;
fig. 3 is a schematic structural diagram of another color film substrate provided in this embodiment of the present application;
fig. 4 is a schematic structural diagram of another color film substrate provided in this embodiment of the present application;
fig. 5 is a schematic structural diagram of another color film substrate provided in this embodiment of the present application;
fig. 6 is a schematic structural diagram of another color film substrate provided in this embodiment of the present application;
fig. 7 is a schematic structural diagram of a groove in a color filter substrate according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a groove in another color film substrate according to an embodiment of the present disclosure;
fig. 9 is a schematic view of a method for manufacturing a color film substrate according to an embodiment of the present disclosure;
fig. 10 is a schematic view of another method for manufacturing a color filter substrate according to an embodiment of the present disclosure;
fig. 11 is a schematic view of a manufacturing method of another color film substrate according to an embodiment of the present disclosure.
Detailed Description
An embodiment of the present application provides a color film substrate, as shown in fig. 1 and 2, the color film substrate includes: the pixel structure comprises a substrate 1 and sub-pixel regions 2 arranged in an array manner on the substrate 1;
at least a part of the sub-pixel region 2 includes: the light-transmitting layer 4 is provided with a groove 3, and the quantum dot microspheres 5 are positioned in the groove 3 and correspond to the light-emitting color of the sub-pixel region 2; the width of the groove 3 is larger than the diameter of the quantum dot microsphere 5 in the groove 3.
The color film substrate provided by the embodiment of the application utilizes the quantum dot microspheres as the color film layer, and the quantum dot microspheres are arranged in the grooves of the light-transmitting layer, so that the pixel density of a display product can be changed by adjusting the size of the grooves and the diameter of the corresponding quantum dot microspheres, the requirement of the resolution ratio of the display product can be met while the color gamut of the display product is improved, and the user experience is improved.
In particular, the quantum dot microspheres are disposed in the open areas of the sub-pixel regions.
Optionally, as shown in fig. 1 and fig. 2, the sub-pixel region 2 includes: a first color sub-pixel region 6 and a second color sub-pixel region 7;
the first color sub-pixel region 6 includes: a first color quantum dot microsphere 8, and a first groove 9;
the second color sub-pixel region 7 includes: a second color quantum dot microsphere 10, and a second groove 11;
the diameter of the first color quantum dot microsphere 8 is smaller than the diameter of the second color quantum dot microsphere 10.
Alternatively, as shown in fig. 1, the first groove 9 and the second groove 11 are located in the same light-transmitting layer 4;
the width of the first groove 9 is smaller than the diameter of the second quantum dot microsphere 10.
In the color film substrate shown in fig. 1, only one light-transmitting layer is arranged, and a first groove and a second groove are formed on the light-transmitting layer, and in specific implementation, the width of the first groove is smaller than the diameter of the second quantum dot microspheres, so that the second quantum dot microspheres can be prevented from being mistakenly filled into the first groove.
Of course, in specific implementation, multiple light-transmitting film layers may be provided.
Optionally, as shown in fig. 2, the light-transmitting layer 4 includes a first light-transmitting sub-layer 12, and a second light-transmitting sub-layer 13 located on a side of the first light-transmitting sub-layer 12 facing away from the substrate 1;
the first groove 9 is located in the first light-transmitting sublayer 12, and the second groove 11 is located in the second light-transmitting sublayer 13 and the first light-transmitting sublayer 12.
In the color film substrate shown in fig. 2 provided in the embodiment of the present application, the first groove is only located in the first light-transmitting sublayer, and the subsequently formed second light-transmitting sublayer located on the first light-transmitting sublayer covers the first quantum dot microspheres and fills the gap between the first quantum dot microspheres and the first groove to fix the first quantum dot microspheres. And the total thickness of the first light-transmitting sublayer and the second light-transmitting sublayer is larger than the diameter of the first quantum dot microsphere, so that the first quantum dot microsphere can be prevented from being damaged in the process of forming the second groove by a subsequent patterning process.
Optionally, the first color sub-pixel region is a red sub-pixel region, and the second color sub-pixel region is a green sub-pixel region; the first color quantum dot microspheres are red quantum dot microspheres, and the second color quantum dot microspheres are green quantum dot microspheres.
Optionally, as shown in fig. 1 to 2, the sub-pixel region further includes a third sub-pixel region 14, and the third sub-pixel region is a blue sub-pixel region.
In specific implementation, the color filter substrate may be, for example, incident with blue light. Optionally, as shown in fig. 1 and fig. 2, the blue sub-pixel region includes a light-transmitting layer. Alternatively, as shown in fig. 3 and 4, the blue sub-pixel region may include a third groove 15 penetrating through the light-transmitting layer.
According to the color film substrate provided by the embodiment of the application, due to the incident of the blue light, the quantum dot color film is not required to be arranged in the blue sub-pixel region, the quantum dot material in the red quantum dot microspheres absorbs the blue light to emit red light, and the quantum dot material in the green quantum dot microspheres absorbs the blue light to emit green light.
In the color film substrate shown in fig. 3 and 4 provided in the embodiment of the present application, the light-transmitting film layer is removed in the blue sub-pixel region, so that the light transmittance can be improved, and the light-emitting efficiency of the display product can be improved.
It should be noted that, the light conversion efficiency of the green quantum dots to the blue light is lower than the light conversion capability of the red quantum dots to the blue light, and in the specific implementation, when the blue light is incident on the color film substrate, in the color film substrate provided in the embodiment of the present application, the size of the second groove of the green sub-pixel region is larger than the size of the first groove of the red sub-pixel region, and the diameter of the green quantum dot microspheres is larger than the diameter of the red quantum dot microspheres, so that the performance requirements and the driving to the blue backlight are reduced, and the overall full-color capability is balanced.
In specific implementation, for example, white light may be incident on the color film substrate, as shown in fig. 5 and 6, the blue sub-pixel region includes: blue light quantum dot microspheres 16 and a third groove 15.
In fig. 5, taking the example of forming the grooves on the single-layer light-transmitting layer as an example, in the specific implementation, the quantum dot microspheres in the sub-pixel regions with different light-emitting colors have different diameters, and each groove can only accommodate the quantum dot microsphere corresponding to the groove.
In fig. 6, the light-transmissive layer 4 further includes a third light-transmissive sublayer 18 located above the second light-transmissive sublayer 13, the third light-transmissive sublayer 18 covers the second color quantum dot microspheres 10, and the third groove 15 is located in the third light-transmissive sublayer 18, the second light-transmissive sublayer 13, and the first light-transmissive sublayer 12.
Optionally, as shown in fig. 1 to 6, the color filter substrate further includes: and the light-transmitting packaging layer 17 is positioned on one side of the light-transmitting layer, which is far away from the substrate.
In specific implementation, as shown in fig. 3 and 4, when the color film substrate is incident to blue light, and the third groove 15 is disposed in the blue sub-pixel region, the third groove 15 further penetrates through the light-transmitting encapsulation layer 17.
Optionally, the quantum dot microsphere comprises: high polymer microspheres and quantum dots injected into the high polymer microspheres.
Alternatively, the polymeric microspheres have a diameter of 0.1 micrometers (μm) to 100 μm.
In specific implementation, the material of the light-transmitting packaging layer can be selected to be a material with a refractive index close to that of the high polymer, so that light loss of the interface between the light-transmitting packaging layer and the quantum dot microsphere can be reduced, and the light utilization rate is improved. The polymer may be Polystyrene (PS), for example, and the material of the light-transmitting encapsulation layer may include Polyimide (PI) or Polyethylene terephthalate (PET) polymer material, for example.
In particular implementations, the red quantum dot material may include, for example, cadmium selenide (CdSe), and the green quantum dot material may include, for example, zinc sulfide (ZnS). The material of the light-transmitting layer may include a photoresist.
In the color filter substrate shown in fig. 1 to 6 provided in the embodiment of the present application, a cross section of the groove perpendicular to the substrate is a rectangle, that is, the bottom of the groove is a plane, and in a specific implementation, the bottom of the groove may also adopt other arrangement manners.
Optionally, as shown in fig. 7, the surface of the groove 3 close to the substrate base plate 1 is a spherical surface;
alternatively, as shown in fig. 8, in a region where the groove 3 covers the light-transmitting layer 4, the light-transmitting layer 4 has a plurality of photon-transmitting structures 19; the thickness of the photon-transmitting structure 19 is smaller than that of the light-transmitting layer 4, and the thickness of the photon-transmitting structure 19 gradually increases in a direction pointing to the side surface of the groove 3 along the groove 3 perpendicular to the symmetry axis 20 of the substrate base plate 1.
According to the color film substrate provided by the embodiment of the application, the bottom surface of the groove is a spherical surface, or the bottom surface of the groove points to the side surface of the groove along the symmetry axis of the substrate perpendicular to the groove, and the thickness of the photon transmission structure is gradually increased, so that the shape of the bottom surface of the groove is closer to that of the quantum dot microspheres, and the quantum dot microspheres can be filled into the groove.
As shown in fig. 9, a method for manufacturing a color film substrate provided in an embodiment of the present application includes:
s101, providing a substrate base plate;
s102, forming a light transmitting layer on the substrate, forming a groove on the light transmitting layer of a sub-pixel area where quantum dot microspheres need to be arranged, and filling the quantum dot microspheres corresponding to the light emitting color of the sub-pixel area into the groove through a self-assembly process.
According to the color film substrate manufacturing method provided by the embodiment of the application, the euphotic layer is arranged on the substrate, the groove is formed in the euphotic layer, so that quantum dot microspheres serving as the color film layer are accommodated, the groove can be filled with the quantum dot microspheres through a fluid self-assembly process subsequently, the pixel density of a display product can be changed by adjusting the size of the groove and the diameter of the corresponding quantum dot microspheres, the requirement of the resolution ratio of the display product can be met while the color gamut of the display product is improved, and the user experience is improved.
Optionally, before the quantum dot microspheres corresponding to the light emitting colors of the sub-pixel regions are filled into the grooves by a self-assembly process, the method further includes a step of preparing quantum dot microsphere solutions with different colors respectively.
Next, a preparation method of a quantum dot microsphere solution is exemplified by using PS microspheres, and the preparation of quantum dot microspheres includes:
providing PS microspheres and dispersing the PS microspheres in an ethanol solvent to obtain a PS microsphere solution;
providing quantum dot materials, and dispersing the quantum dot materials in a chloroform solvent to obtain a quantum dot solution;
injecting the quantum dot solution into the PS microsphere solution and performing ultrasonic dispersion to obtain a dispersion liquid;
performing centrifugal separation on the dispersion liquid, reserving a precipitate part, washing the precipitate part for multiple times by using ethanol until supernatant is clear, and reserving the washed precipitate to obtain quantum dot microspheres;
dispersing the quantum dot microspheres into a first solvent to form a uniformly dispersed suspension to obtain a quantum dot microsphere solution.
In specific implementation, the first solvent may be a polar solvent such as ethanol, isopropanol, or the like, and the quantum dot microspheres may be dispersed in the first solvent by ultrasonic dispersion.
In specific implementation, when blue light is incident on the color film substrate and red quantum dot microspheres and green quantum dot microspheres need to be prepared, in order to ensure the light conversion efficiency of the red quantum dots and the green quantum dots and reduce the risk of blue light leakage, the concentration of the quantum dots in the dispersion can be controlled to be at least 10 times of that of the PS microspheres. It should be noted that the larger the size of the PS microsphere, the lower the requirement for the concentration of the quantum dots, for example, the concentration ratio of the quantum dots to the PS microsphere is greater than 10% for a red quantum dot PS microsphere with a diameter of 5 μm, and the concentration ratio of the quantum dots to the PS microsphere is greater than 20% for a green quantum dot PS microsphere with a diameter of 7 μm.
In a specific embodiment, only one light-transmitting layer may be provided.
Optionally, the sub-pixel region includes: a first color sub-pixel region and a second color sub-pixel region; in step S102, forming a light-transmitting layer on the substrate, and forming a groove for accommodating the quantum dot microspheres on the light-transmitting layer of the sub-pixel region where the quantum dot microspheres need to be disposed, specifically including:
s1021, forming a first light-transmitting sublayer on the substrate;
s1022, forming a first groove on the first light-transmitting sublayer of the first color sub-pixel region and forming a second groove on the first light-transmitting sublayer of the second color sub-pixel region by using a patterning process, wherein a width of the first groove is smaller than a width of the second groove.
In a specific implementation, the material of the first light-transmitting sublayer may be, for example, photoresist, i.e., a photoresist layer is formed on the substrate base plate. The process of patterning the photoresist layer may specifically include: and exposing and developing the photoresist layer to form a groove, and then curing the photoresist layer.
In specific implementation, in order to ensure the fixing capability of subsequent quantum dot microsphere self-assembly and reduce the requirement on the thickness of the photoresist, the ratio of the thickness of the photoresist layer to the diameter of the quantum dot microsphere is 1: 2-2: 3.
optionally, in step S102, filling the quantum dot microspheres corresponding to the light-emitting color of the sub-pixel region into the groove through a self-assembly process, specifically including:
s1023, placing the substrate base plate with the first groove and the second groove in a second color quantum dot microsphere solution, and controlling the second color quantum dot microsphere solution to flow so as to fill the second color quantum dot microsphere into the second groove;
s1024, placing the substrate base plate filled with the second color quantum dot microspheres into a first color quantum dot microsphere solution, and controlling the first color quantum dot microsphere solution to flow so as to enable the first color quantum dot microspheres to be filled into the first grooves;
the diameter of the first color quantum dot microsphere is smaller than that of the second color quantum dot microsphere, and the diameter of the second color quantum dot microsphere is larger than the width of the first groove.
In particular implementations, the first color quantum dot microspheres may be, for example, red quantum dot microspheres and the second color quantum dot microspheres may be, for example, green quantum dot microspheres.
Of course, in specific implementation, multiple light-transmitting film layers may be provided.
Optionally, the sub-pixel region includes: a first color sub-pixel region and a second color sub-pixel region; forming a light transmission layer on the substrate, and forming a groove for accommodating the quantum dot microspheres on the light transmission layer of the sub-pixel region where the quantum dot microspheres need to be arranged, specifically comprising:
s102-1, forming a first light-transmitting sublayer on the substrate base plate;
s102-2, forming a first groove on a first light-transmitting sub-layer of the first color sub-pixel region by adopting a patterning process;
s102-4, forming a second light-transmitting sublayer on the first light-transmitting sublayer;
s102-5, forming a second groove on the first light-transmitting sub-layer and the second light-transmitting sub-layer of the second color sub-pixel region by adopting a patterning process.
In a specific implementation, the material of the first light-transmitting sublayer and the second light-transmitting sublayer may be, for example, photoresist, that is, a photoresist layer is formed on the substrate, and the patterning process for forming the first groove may specifically include: and exposing and developing the photoresist layer to form a groove, and then curing the photoresist layer. And then, a second photoresist layer is formed on the cured first photoresist layer, and the patterning process for forming the second groove needs to etch the cured first photoresist layer in addition to exposing and developing the second photoresist layer.
Optionally, filling the quantum dot microspheres corresponding to the light emitting color of the sub-pixel region into the groove by a self-assembly process, specifically including:
s102-3, before a second light-transmitting sub-layer is formed on the first light-transmitting sub-layer, placing a substrate base plate in a first color quantum dot microsphere solution, and controlling the first color quantum dot microsphere solution to flow so as to enable the first color quantum dot microspheres to be filled into the first groove;
s102-6, after a second groove is formed in the first light-transmitting sub-layer and the second light-transmitting sub-layer of the second color sub-pixel region by adopting a patterning process, placing the substrate base plate in a second color quantum dot microsphere solution, and controlling the second color quantum dot microsphere solution to flow so as to fill the second groove with the second color quantum dot microspheres.
Optionally, after filling the quantum dot microspheres corresponding to the light emitting colors of the sub-pixel regions into the grooves by a self-assembly process, the method further includes:
and forming a light-transmitting packaging layer on one side of the light-transmitting layer, which is far away from the substrate.
Optionally, before forming the light-transmitting encapsulation layer on the side of the light-transmitting layer facing away from the substrate base plate, the method further includes: and heating the substrate base plate to remove the residual solvent on the substrate base plate.
Next, taking an example of providing a light-transmitting layer on a substrate, a method for manufacturing a color filter substrate provided in this embodiment is illustrated. As shown in fig. 10, the method for manufacturing a color film substrate includes the following steps:
s201, coating photoresist on the substrate base plate 1 to form a first light-transmitting sublayer 12;
s202, carrying out a patterning process on the first light-transmitting sublayer 12 to form a first groove 9 and a second groove 11; the width of the first groove 9 is smaller than that of the second groove 11, and the width of the first groove 9 is smaller than the diameter of the green quantum dot microsphere;
s203, placing the substrate base plate 1 in a green quantum dot microsphere solution, and controlling the green quantum dot microsphere solution to flow so as to enable the green quantum dot microspheres 20 to be filled in the second grooves 11;
s204, taking the substrate base plate 1 out of the green quantum dot microsphere solution, placing the substrate base plate 1 in the red quantum dot microsphere solution, and controlling the red quantum dot microsphere solution to flow so as to fill the red quantum dot microspheres 21 into the first groove 9;
s205, taking the substrate base plate 1 out of the red quantum dot microsphere solution, and heating the substrate base plate 1 to remove the residual solvent in the quantum dot microsphere solution;
and S206, forming a light-transmitting packaging layer 17 covering the first light-transmitting sublayer 12, the red quantum dot microspheres 21 and the green quantum dot microspheres 20.
Next, taking an example of providing a multi-layer light-transmitting layer on a substrate, a method for manufacturing a color film substrate provided in this embodiment is illustrated. As shown in fig. 11, the method for manufacturing a color film substrate includes the following steps:
s301, coating photoresist on the substrate base plate 1 to form a first light-transmitting sublayer 12;
s302, carrying out a patterning process on the first light-transmitting sublayer 12 to form a first groove 9;
s303, placing the substrate base plate 1 in a red quantum dot microsphere solution, and controlling the red quantum dot microsphere solution to flow so as to fill the red quantum dot microspheres 21 into the first groove 9;
s304, taking the substrate base plate 1 out of the red quantum dot microsphere solution, and heating the substrate base plate 1 to remove the residual solvent in the quantum dot microsphere solution;
s305, forming a second light-transmitting sublayer 13 on the first light-transmitting sublayer 12, and forming two grooves 11 penetrating through the first light-transmitting sublayer 12 and the second light-transmitting sublayer 13;
s306, placing the substrate base plate 1 in a green quantum dot microsphere solution, and controlling the green quantum dot microsphere solution to flow so as to enable the green quantum dot microspheres 20 to be filled in the second groove 11;
s307, taking the substrate base plate 1 out of the green quantum dot microsphere solution, and heating the substrate base plate 1 to remove the residual solvent in the quantum dot microsphere solution;
and S308, forming a light-transmitting packaging layer 17 covering the second light-transmitting sublayer 13, the red quantum dot microspheres 21 and the green quantum dot microspheres 20.
It should be noted that, when the light-transmitting layer and the light-transmitting encapsulation layer in the blue sub-pixel region need to be removed, for the scheme of providing a light-transmitting layer, after the light-transmitting encapsulation layer is formed in step S206, the light-transmitting encapsulation layer and the first light-transmitting sublayer in the blue sub-pixel region may be removed by using a patterning process. For the scheme of disposing a multi-layer transparent layer, after the transparent encapsulation layer is formed in step S308, the transparent encapsulation layer, the second transparent sub-layer, and the first transparent sub-layer in the blue sub-pixel region may be removed by a patterning process.
In fig. 10 and 11, the formed groove-exposed substrate is illustrated as an example, and in the specific implementation, the groove shown in fig. 7 and 8 may be formed.
An embodiment of the present application provides a display panel, display panel includes: the color film substrate and the array substrate are arranged opposite to the color film substrate.
The Display panel provided in the embodiment of the present application may be an Organic Light-Emitting Diode (OLED) Display panel, a Liquid Crystal Display (LCD) panel, or a Micro LED (Micro LED) Display panel.
When the display panel is an OLED display panel, the array substrate includes an OLED device, and in particular, the OLED may be a blue OLED or a white OLED. When the display panel is an LCD, the display panel further includes a liquid crystal layer between the color film substrate and the array substrate, for LCD display, the backlight may emit blue light or white light, and in order to obtain a high-resolution display requirement, the backlight may select a Micro LED device. When the display panel is a Micro LED display panel, the array substrate includes Micro LED devices.
In summary, the color film substrate, the manufacturing method thereof and the display panel provided by the embodiment of the application utilize the quantum dot microspheres as the color film layer, and the quantum dot microspheres are arranged in the grooves of the light-transmitting layer, so that the pixel density of the display product can be changed by adjusting the size of the grooves and the diameter of the corresponding quantum dot microspheres, the color gamut of the display product can be improved, the requirement of the resolution of the display product can be met, and the user experience can be improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (15)
1. The color film substrate is characterized by comprising: the pixel structure comprises a substrate and sub-pixel regions arranged in an array manner on the substrate;
at least part of the sub-pixel regions include: the euphotic layer is provided with a groove, and the quantum dot microspheres are positioned in the groove and correspond to the light emitting color of the sub-pixel area; the width of the groove is larger than the diameter of the quantum dot microsphere in the groove.
2. The color filter substrate according to claim 1, wherein the sub-pixel region comprises: a first color sub-pixel region and a second color sub-pixel region;
the first color sub-pixel region includes: the first color quantum dot microsphere and the first groove;
the second color sub-pixel region includes: the second color quantum dot microspheres and a second groove;
the diameter of the first color quantum dot microsphere is smaller than that of the second color quantum dot microsphere.
3. The color filter substrate according to claim 2, wherein the first groove and the second groove are located in the same light-transmitting layer;
the width of the first groove is smaller than the diameter of the second quantum dot microsphere.
4. The color film substrate according to claim 2, wherein the light-transmitting layer comprises a first light-transmitting sublayer and a second light-transmitting sublayer located on a side of the first light-transmitting sublayer, which is away from the substrate;
the first groove is located in the first photon transmission layer, and the second groove is located in the second light transmission sublayer and the first photon transmission layer.
5. The color filter substrate according to claim 2, wherein the first color sub-pixel region is a red sub-pixel region, and the second color sub-pixel region is a green sub-pixel region; the first color quantum dot microspheres are red quantum dot microspheres, and the second color quantum dot microspheres are green quantum dot microspheres;
the sub-pixel region further comprises a blue sub-pixel region;
the color film substrate is incident with blue light, and the blue sub-pixel region comprises a third groove penetrating through the light transmission layer;
or, the color film substrate emits white light, and the blue sub-pixel region includes: blue light quantum dot microballon and third recess.
6. The color filter substrate according to claim 1, further comprising: and the light-transmitting packaging layer is positioned on one side of the light-transmitting layer, which is far away from the substrate.
7. The color film substrate of claim 1, wherein the quantum dot microspheres comprise: high polymer microspheres and quantum dots injected into the high polymer microspheres.
8. The color film substrate according to claim 1, wherein the surface of the groove close to the substrate is a spherical surface;
or the light-transmitting layer is provided with a plurality of light-transmitting substructures in the region where the groove covers the light-transmitting layer; the thickness of the photon-transmitting structure is smaller than that of the light-transmitting layer, and the thickness of the photon-transmitting structure is gradually increased along the direction in which the groove is perpendicular to the symmetrical axis of the substrate base plate and points to the side surface of the groove.
9. A method for preparing a color film substrate is characterized by comprising the following steps:
providing a substrate base plate;
and forming a light transmitting layer on the substrate, forming a groove on the light transmitting layer of the sub-pixel region where the quantum dot microspheres need to be arranged, and filling the quantum dot microspheres corresponding to the light emitting color of the sub-pixel region into the groove through a self-assembly process.
10. The method of claim 9, wherein the sub-pixel region comprises: a first color sub-pixel region and a second color sub-pixel region; forming a light transmission layer on the substrate, and forming a groove for accommodating the quantum dot microspheres on the light transmission layer of the sub-pixel region where the quantum dot microspheres need to be arranged, specifically comprising:
forming a first light-transmitting sublayer on the substrate;
and forming a first groove on the first light-transmitting sublayer of the first color sub-pixel region and a second groove on the first light-transmitting sublayer of the second color sub-pixel region by adopting a patterning process, wherein the width of the first groove is smaller than that of the second groove.
11. The method according to claim 10, wherein the filling of the quantum dot microspheres corresponding to the light emission color of the sub-pixel region into the groove by a self-assembly process comprises:
placing the substrate base plate with the first groove and the second groove in a second color quantum dot microsphere solution, and controlling the second color quantum dot microsphere solution to flow so that the second color quantum dot microsphere is filled into the second groove;
placing the substrate base plate filled with the second color quantum dot microspheres in a first color quantum dot microsphere solution, and controlling the first color quantum dot microsphere solution to flow so as to fill the first color quantum dot microspheres into the first grooves;
the diameter of the first color quantum dot microsphere is smaller than that of the second color quantum dot microsphere, and the diameter of the second color quantum dot microsphere is larger than the width of the first groove.
12. The method of claim 9, wherein the sub-pixel region comprises: a first color sub-pixel region and a second color sub-pixel region; forming a light transmission layer on the substrate, and forming a groove for accommodating the quantum dot microspheres on the light transmission layer of the sub-pixel region where the quantum dot microspheres need to be arranged, specifically comprising:
forming a first light-transmitting sublayer on the substrate;
forming a first groove on a first light-transmitting sub-layer of the first color sub-pixel region by adopting a patterning process;
forming a second light-transmitting sublayer over the first light-transmitting sublayer;
and forming a second groove on the first light-transmitting sublayer and the second light-transmitting sublayer of the second color sub-pixel region by adopting a patterning process.
13. The method according to claim 12, wherein the filling of the quantum dot microspheres corresponding to the light emission color of the sub-pixel region into the groove by a self-assembly process comprises:
before a second light-transmitting sub-layer is formed on the first light-transmitting sub-layer, placing a substrate in a first color quantum dot microsphere solution, and controlling the first color quantum dot microsphere solution to flow so as to fill the first color quantum dot microspheres into the first groove;
after a second groove is formed in the first light-transmitting sub-layer and the second light-transmitting sub-layer of the second color sub-pixel region by adopting a patterning process, the substrate base plate is placed in a second color quantum dot microsphere solution, and the flow of the second color quantum dot microsphere solution is controlled, so that the second groove is filled with the second color quantum dot microspheres.
14. The method of claim 9, wherein after filling the quantum dot microspheres corresponding to the light emitting color of the sub-pixel region into the groove by a self-assembly process, the method further comprises:
and forming a light-transmitting packaging layer on one side of the light-transmitting layer, which is far away from the substrate.
15. A display panel, comprising: a color filter substrate as claimed in any one of claims 1 to 8, and an array substrate disposed opposite to the color filter substrate.
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