CN118053864A - Light conversion unit, preparation method thereof, display panel and pixel unit - Google Patents
Light conversion unit, preparation method thereof, display panel and pixel unit Download PDFInfo
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- CN118053864A CN118053864A CN202211400157.4A CN202211400157A CN118053864A CN 118053864 A CN118053864 A CN 118053864A CN 202211400157 A CN202211400157 A CN 202211400157A CN 118053864 A CN118053864 A CN 118053864A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
- H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
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- Computer Hardware Design (AREA)
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Abstract
The application relates to a light conversion unit, a preparation method thereof, a display panel and a pixel unit, wherein when the light conversion unit is prepared, light treatment liquid and isolation liquid can be alternately injected into the same flow channel based on a microfluidic technology, so that the light treatment liquid fills hemispherical-like grooves of the flow channel to form a light treatment structure, and the isolation liquid fills the flow channels between the hemispherical-like grooves to form an isolation structure for isolating adjacent light treatment structures. In addition, when the light treatment liquid is injected, the first light treatment liquid, the second light treatment liquid and the third light treatment liquid are alternately injected, the same flow channel can realize the preparation of three light treatment structures, and compared with the mode of forming the light conversion unit by printing and coating the light treatment liquid, the preparation scheme of the light conversion unit based on the same micro flow channel has greatly improved preparation efficiency. On the other hand, the filling position and the boundary range of the semi-sphere-like groove have a limiting effect on the light treatment liquid, so that the influence of the liquid fluidity on the quality of the light treatment structure can be reduced.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a light conversion unit, a manufacturing method thereof, a display panel, and a pixel unit.
Background
Each pixel point in the full-color display panel supports red, green and blue Light emission, and at present, there are two main technical means for preparing the full-color display panel, one is to directly prepare an LED (Light-Emitting Diode) chip with quantum well layers respectively Emitting red Light, green Light and blue Light, and then transfer-bond the LED chip to a driving backboard; the other is to use a purple light LED or a blue light LED as a light source and combine the light conversion function of the quantum dot material to realize full-color display. In the former mode, the preparation and transfer of the LED chips are required to be carried out respectively, so that the preparation flow of the display panel is complex, and the light emitting efficiency of the red light epitaxial layer is low, so that the display effect of the display panel is poor; in the latter way, although the preparation and transfer processes of the LED chip are simplified, if the quantum dot material is arranged on the light emitting surface of the LED chip in a liquid state, the formed quantum dot film is highly likely to have irregular boundaries and undesirable morphology due to the flowability of the liquid, thereby affecting the quality of the prepared display panel. And along with the gradual reduction of the sizes of the LED chips, the efficiency of printing or coating the quantum dot solution on the light emitting surface of each LED chip one by one to form the quantum dot film is low, and the production requirement is difficult to meet.
Therefore, how to improve the morphology of the quantum dot material on the light emitting chip and to improve the production efficiency of the display panel is a technical problem to be solved.
Disclosure of Invention
In view of the above-mentioned drawbacks of the related art, an object of the present application is to provide a light conversion unit, a manufacturing method thereof, a display panel and a pixel unit, which are aimed at solving the problems of poor morphology of quantum dot materials of a light emitting chip and low production efficiency of the display panel.
The present application first provides a light conversion unit including:
A light-transmitting flow channel substrate;
The light processing structures comprise a first light processing structure, a second light processing structure and a third light processing structure, and the three light processing structures are respectively configured to process incident light with the same wavelength into red light, green light and blue light and then emit the red light, the green light and the blue light; and
Isolation structures disposed between adjacent light processing structures;
The light processing structure and the isolation structure are respectively formed in the quasi-hemispherical grooves and the inter-groove flow channels, and the first light processing structure, the second light processing structure and the third light processing structure are connected in series on the same flow channel.
In the above light conversion unit, the light-transmitting runner substrate is provided with the runner, the runner comprises a plurality of quasi-hemispherical grooves and inter-groove runners connected with the quasi-hemispherical grooves in series, the light processing structure and the isolation structure are respectively formed in the quasi-hemispherical grooves and the inter-groove runners, and the first light processing structure, the second light processing structure and the third light processing structure are connected in series on the same runner, so that when the light conversion unit is prepared, light processing liquid and isolation liquid can be alternately injected into the same runner based on the micro-runner technology, the quasi-hemispherical grooves of the runner are filled with the light processing liquid to form the light processing structure, and the inter-groove runners between the quasi-hemispherical grooves are filled with the isolation liquid to form the isolation structure for isolating adjacent light processing structures. In addition, when the light treatment liquid is injected, the first light treatment liquid, the second light treatment liquid and the third light treatment liquid are alternately injected, the same flow channel can realize the preparation of three light treatment structures, and compared with the mode of forming the light conversion unit by printing and coating the light treatment liquid, the preparation scheme of the light conversion unit based on the same micro flow channel has greatly improved preparation efficiency. On the other hand, the filling position and the boundary range of the semi-sphere-like groove have a limiting effect on the light treatment liquid, so that the influence of the liquid fluidity on the quality of the light treatment structure can be reduced. Meanwhile, the hemispherical groove is hemispherical, and the light processing structure formed by the hemispherical groove is also provided with an arc surface, so that the light processing structure can realize light wavelength conversion and simultaneously has the light beam shaping function of a lens, and the display performance of the display panel is improved.
Optionally, a plurality of raised microstructures are arranged on the inner wall of any one of the semi-sphere-like grooves and the flow channels between the grooves, and the light treatment structure or the isolation structure which is attached to the microstructures is made of oil phase materials.
In the light conversion unit, the inner wall of any one of the hemispherical-like grooves and the flow channels between the grooves is provided with a plurality of raised microstructures, the microstructures have relative hydrophobic and oleophilic functions, aqueous phase liquid can be more easily limited in the area without microstructures on the inner wall, oil phase liquid can be more easily limited in the area with microstructures on the inner wall, the light treatment liquid and isolation liquid can be conveniently self-positioned when the light conversion unit is prepared based on the micro-flow channels, the position distribution accuracy of the light treatment structure and the isolation structure in the light conversion unit is improved, and the quality of the light conversion unit is enhanced.
Optionally, the isolation structure is a photoresist structure that optically isolates between adjacent light handling structures.
The isolation structure of the light conversion unit is a light resistance structure, and can optically isolate adjacent light treatment structures in the extending direction of the flow channel, so that light channeling is reduced or even stopped, and the purity of light emitted by the light conversion unit is improved.
Optionally, at least two parallel flow channels and an optical isolation groove parallel to the flow channels are arranged on the flow channel substrate, any one of light absorbing material and light reflecting material is arranged in the optical isolation groove, the light absorbing material and the light reflecting material are arranged between adjacent flow channels at intervals, and the light isolation groove is configured to optically isolate the adjacent flow channels.
In the light conversion unit, the light isolation grooves are further arranged between the adjacent flow channels, and can be used for carrying out light isolation on the adjacent light treatment structures in the direction perpendicular to the extending direction, so that the light channeling problem is further reduced.
Optionally, the light conversion unit further comprises:
A light-transmitting cover plate laminated with the runner substrate; the light-transmitting cover plate is provided with hemispherical dome-like structures corresponding to the light-processing structures one by one, openings of the hemispherical dome-like structures are opposite to notches of the hemispherical grooves, and the light-processing structures are located in the hemispherical dome-like structures and the hemispherical grooves at the same time.
In the light conversion unit, the light conversion unit further comprises a light-transmitting cover plate matched with the runner base plate, the light-transmitting cover plate is provided with a hemispherical dome matched with the hemispherical groove, the hemispherical dome corresponds to the hemispherical groove in position, and the hemispherical dome and the hemispherical groove can be enclosed to form a spheroid space, so that a spheroid light treatment structure is formed, and the beam shaping effect of the light treatment structure is enhanced.
Optionally the light conversion unit further comprises at least one of the following:
the filter layer is laminated with the runner substrate, and the distance between the light incident surface of the light processing structure and the filter layer is larger than the distance between the light emergent surface of the light processing structure and the filter layer;
The lens array layer is arranged in a lamination manner with the runner substrate, the distance between the light incident surface of the light processing structure and the lens array layer is larger than the distance between the light emergent surface of the light processing structure and the lens array layer, the lens array layer comprises a plurality of microlenses arranged in an array manner, and the microlenses correspond to the positions of the light processing structure one by one.
The light conversion unit is also provided with at least one of a filter layer and a lens array layer, wherein the filter layer can filter the light emitted by the light processing structure, so that the purity of the light emitted by the light conversion unit is further improved. The lens array layer can adjust and control the divergence angle of the light emitted by the light processing structure, which is beneficial to enhancing the display effect of the corresponding display panel.
Based on the same inventive concept, the present application also provides a display panel including:
A drive back plate;
the light-emitting chip array is arranged on the driving backboard; and
A light conversion unit according to any one of the preceding claims;
The light-emitting chip array comprises a plurality of light-emitting chips electrically connected with the driving backboard, and the light-emitting chips are arranged in an array manner; the light conversion unit and the driving backboard are stacked and arranged and positioned in the light emitting direction of the light emitting chip array.
The light conversion unit used in the display panel is prepared by injecting the isolating liquid and the three light treatment liquids into a micro-channel, so that the preparation efficiency of the display panel is greatly improved. On the other hand, the filling position and the boundary range of the semi-sphere-like groove have a limiting effect on the light treatment liquid, so that the influence of the liquid fluidity on the quality of the light treatment structure can be reduced. Meanwhile, the hemispherical groove is hemispherical, and the light processing structure formed by the hemispherical groove is also provided with an arc surface, so that the light processing structure can realize light wavelength conversion and simultaneously has the light beam shaping function of a lens, and the display performance of the display panel is improved.
Based on the same inventive concept, the present application also provides a pixel unit including:
At least three light emitting chips;
A light conversion unit according to any one of the preceding claims; and
The light conversion units are arranged in the light emitting direction of the light emitting chip, and the light processing structures correspond to the positions of the light emitting chip one by one.
The light conversion unit used in the pixel unit is prepared by injecting the isolation liquid and the three light treatment liquids into a micro-channel, so that the preparation efficiency of the pixel unit is greatly improved. On the other hand, the filling position and the boundary range of the semi-sphere-like groove have a limiting effect on the light treatment liquid, so that the influence of the liquid fluidity on the quality of the light treatment structure can be reduced. Meanwhile, because the hemispherical groove is hemispherical, the light treatment structure formed by the hemispherical groove is also provided with an arc surface, so that the light treatment structure can realize light wavelength conversion and simultaneously has the light beam shaping function of a lens, the light emitting effect of the pixel unit is improved, and the quality of the display panel manufactured based on the pixel unit is further enhanced.
Based on the same inventive concept, the application further provides a preparation method of the light conversion unit, comprising the following steps:
A runner is arranged on the light-transmitting substrate to form a runner substrate, and the runner comprises a plurality of semi-sphere-like grooves and inter-groove runners connected with the semi-sphere-like grooves in series;
Bonding the runner base plate and the runner cover plate;
Alternately injecting light treatment liquid and isolation liquid into the flow channel, wherein the light treatment liquid and the isolation liquid occupy the semi-sphere-like grooves and the flow channels between the grooves respectively; the light treatment liquid comprises a first light treatment liquid, a second light treatment liquid and a third light treatment liquid which are alternately injected; and
The light treatment liquid and the isolation liquid are solidified to form a light treatment structure and an isolation structure respectively, wherein the light treatment structure comprises a first light treatment structure, a second light treatment structure and a third light treatment structure which are respectively formed by the first light treatment liquid, the second light treatment liquid and the third light treatment liquid, and the three light treatment structures are respectively configured to treat incident light with the same wavelength into red light, green light and blue light and then emit the red light, the green light and the blue light.
According to the preparation method of the light conversion unit, the light-transmitting runner substrate is provided with the runner, the runner comprises a plurality of quasi-hemispherical grooves and inter-groove runners connected with the quasi-hemispherical grooves in series, the light treatment structure and the isolation structure are respectively formed in the quasi-hemispherical grooves and the inter-groove runners, and the first light treatment structure, the second light treatment structure and the third light treatment structure are connected in series on the same runner, so that when the light conversion unit is prepared, light treatment liquid and isolation liquid can be alternately injected into the same runner based on the micro-runner technology, the quasi-hemispherical grooves of the runner are filled with the light treatment liquid to form the light treatment structure, and the inter-groove runners between the quasi-hemispherical grooves are filled with the isolation liquid to form the isolation structure for isolating adjacent light treatment structures. In addition, when the light treatment liquid is injected, the first light treatment liquid, the second light treatment liquid and the third light treatment liquid are alternately injected, the same flow channel can realize the preparation of three light treatment structures, and compared with the mode of forming the light conversion unit by printing and coating the light treatment liquid, the preparation scheme of the light conversion unit based on the same micro flow channel has greatly improved preparation efficiency. On the other hand, the filling position and the boundary range of the semi-sphere-like groove have a limiting effect on the light treatment liquid, so that the influence of the liquid fluidity on the quality of the light treatment structure can be reduced. Meanwhile, the hemispherical groove is hemispherical, and the light processing structure formed by the hemispherical groove is also provided with an arc surface, so that the light processing structure can realize light wavelength conversion and simultaneously has the light beam shaping function of a lens, and the display performance of the display panel is improved.
Optionally, the runner cover plate comprises a light-transmitting cover plate; before bonding the runner base plate and the runner cover plate, the method further comprises:
Forming a plurality of hemispherical dome-like structures on the light-transmitting cover plate, wherein the arrangement of the hemispherical dome-like structures on the light-transmitting cover plate is consistent with the arrangement of the hemispherical grooves on the runner substrate;
bonding the runner base plate and the runner cover plate comprises:
Laminating the runner base plate and the runner cover plate, wherein the opening of the hemispherical dome and the notch of the hemispherical groove are arranged in opposite directions;
and pressing to bond the runner base plate and the runner cover plate.
In the preparation method of the light conversion unit, the runner cover plate matched with the runner substrate is a light-transmitting cover plate, the light-transmitting cover plate is provided with the hemispherical dome matched with the hemispherical groove, the hemispherical dome corresponds to the hemispherical groove in position, and the hemispherical dome and the hemispherical groove can be enclosed to form a spheroid space, so that a spheroid light treatment structure is formed, and the beam shaping effect of the light treatment structure is enhanced.
Drawings
FIG. 1 is a schematic view showing a first configuration of a light conversion unit according to an alternative embodiment of the present application;
FIG. 2a is a schematic view of a first structure of a flow channel substrate according to an alternative embodiment of the present application;
FIG. 2b is a schematic view of a second structure of a flow channel substrate according to an alternative embodiment of the present application;
FIG. 2c is a schematic view of a third structure of a flow channel substrate according to an alternative embodiment of the present application;
FIG. 2d is a schematic view of a fourth structure of a flow channel substrate according to an alternative embodiment of the present application;
FIG. 3 is a schematic top view of a flow channel substrate according to an alternative embodiment of the present application;
FIG. 4a is a schematic diagram showing a second configuration of a light conversion unit according to an alternative embodiment of the present application;
FIG. 4b is a schematic diagram of a third configuration of a light conversion unit according to an alternative embodiment of the present application;
FIG. 5 is a schematic diagram of an alternative embodiment of the present application in which an optical isolation trench is formed in a flow channel substrate;
FIG. 6 is a schematic view of a fifth structure of a flow channel substrate according to an alternative embodiment of the present application;
FIG. 7a is a schematic diagram showing a fourth configuration of a light conversion unit according to an alternative embodiment of the present application;
FIG. 7b is a schematic illustration of a hollow out of the DBR (Distributed Bragg Reflection, distributed Bragg reflector) layer according to an alternative embodiment of the present application;
FIG. 8a is a schematic view of a fifth configuration of a light conversion unit according to an alternative embodiment of the present application;
FIG. 8b is a schematic view of a sixth configuration of a light conversion unit according to an alternative embodiment of the present application;
FIG. 8c is a schematic view of a seventh configuration of a light conversion unit according to an alternative embodiment of the present application;
Fig. 9 is a schematic view showing an eighth configuration of a light conversion unit provided in an alternative embodiment of the present application;
Fig. 10 is a schematic view showing a ninth configuration of a light conversion unit provided in an alternative embodiment of the present application;
FIG. 11 is a schematic view of a lens array layer according to an alternative embodiment of the present application;
fig. 12 is a schematic view showing a tenth structure of a light conversion unit provided in an alternative embodiment of the present application;
FIG. 13 is a schematic flow chart of a method for manufacturing a light conversion unit according to another alternative embodiment of the present application;
FIG. 14 is a schematic top view of a flow channel substrate according to another alternative embodiment of the present application;
FIG. 15a is a schematic view showing the fastening of the runner base plate and the runner cover plate according to another alternative embodiment of the present application;
FIG. 15b is a schematic view of another alternative embodiment of the present application after removal of the temporary substrate layer and sacrificial layer of the runner cover plate;
FIG. 16 is a schematic view of a flow channel substrate according to another alternative embodiment of the present application;
FIG. 17 is a schematic view of a display panel according to another embodiment of the present application;
FIG. 18 is a schematic view showing a pixel unit according to another alternative embodiment of the present application;
fig. 19 is a bottom view of a pixel unit according to another alternative embodiment of the application.
Reference numerals illustrate:
A 10-light conversion unit; 11-a runner substrate; 111-hemispherical grooves; 112-inter-cell flow path; 113-a liquid injection port; 114-an optical isolation groove; 115-microstructure; 12-a light handling structure; 121-a first light handling structure; 122-a second light handling structure; 123-a third light handling structure; 13-isolation structures; 14-a light-transmitting cover plate; 140-hemispherical dome; 141-DBR layer; 142-a bonding layer; 151-a temporary substrate layer; 152-a sacrificial layer; 16-a lens array layer; 160-microlenses; 17-a filter layer; a. b, c, d-liquid injection ports; 200-a display panel; 201-driving a back plate; 202-a light emitting chip; 300-pixel units; 301-a first bonding pad; 302-second pads.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The light conversion materials such as quantum dot materials, fluorescent powder and the like are directly arranged on the light emitting surface of the LED chip or on the substrate in a liquid form in a printing, coating and other modes in forming the light conversion unit, and the fluidity of the liquid can influence the appearance of the light conversion unit to a great extent, so that the yield of the prepared light conversion unit is low; the means such as printing and coating are more suitable for large-size LED chips, but with the development of Mini-LED (sub-millimeter light emitting diode) and Micro-LED (Micro-scale light emitting diode) technologies, the sizes of the LED chips adopted in the display panel are smaller and smaller, and if the corresponding light conversion units are prepared by means of printing, coating and the like, the quality of the light conversion units is difficult to ensure, and the production efficiency requirement of the display panel is also difficult to meet.
Based on this, the present application is intended to provide a solution to the above technical problem, the details of which will be described in the following examples.
An alternative embodiment of the application:
the present embodiment first provides a light conversion unit, please refer to a schematic cross-sectional view of the light conversion unit 10 shown in fig. 1: the light conversion unit 10 includes a flow channel substrate 11, a light processing structure 12, and an isolation structure 13.
The flow channel substrate 11 is a light-transmitting substrate, and may be, for example, a glass substrate, a sapphire substrate, PDMS (polydimethylsiloxane), PMMA (polymethyl methacrylate), or the like. The flow channel substrate 11 has two opposite surfaces of large area, which are distinguished by a "front" and a "back" in this embodiment. It is clear that there are also other faces between the front and back faces of the flow channel substrate 11, which faces are referred to as "side faces" in this embodiment, it being understood that for a layered flow channel substrate 11 the side face area is much smaller than the back face of the front or back face.
A plurality of flow channels are provided on one surface of the flow channel substrate 11, and one flow channel includes a plurality of hemispherical-like grooves 111 and inter-groove flow channels 112 connected in series with the hemispherical-like grooves. First, the meaning of "hemispherical groove" will be described: the interior space of semi-sphere-like channel 111 is similar to a hemisphere, in some examples, the interior space of semi-sphere-like channel 111 is a standard hemisphere, as shown in fig. 1; however, in more examples, the inner space of the semi-sphere-like groove 111 is not a standard hemisphere, for example, in the schematic cross-sectional view of the flow channel substrate 11 shown in fig. 2a, the arc profile of the semi-sphere-like groove 111 is only a minor arc, not a semicircle, and thus, the inner space of the semi-sphere-like groove 111 is not a standard hemisphere; the arc profile of the semi-sphere-like groove 111 in fig. 2b is a major arc, and the inner space of the semi-sphere-like groove 111 is not a standard hemisphere; in still other examples, the inner wall of the hemispherical groove 111 is still a cambered surface, but the cambered surface does not solely belong to the sphere of a sphere, but is formed by splicing spherical areas of two or more spheres: for example, as shown in fig. 2c, the inner wall of the arc surface of the hemispherical groove 111 is formed by splicing at least two spherical areas, and the spliced part is smooth, round and prism-free; however, in the hemispherical-like groove 111 shown in fig. 2d, the joint portion of the spherical surface region has an angular edge; in practical applications, when the quasi-hemispherical groove 111 is provided on the flow path substrate 11, the internal space of the quasi-hemispherical groove 111 is not a standard hemisphere due to the process level or the like; however, in either case, as long as the groove space formed on the flow passage substrate 11 is a part of a sphere, or the inner wall of the groove is a cambered surface, the groove is a "hemispherical groove" in the present embodiment.
The serial connection of the channels 112 to the hemispheric-like channels 111 is similar to the serial connection of the line pair beads in the bead string, the two hemispheric-like channels 111 are communicated through a channel 112, two ends of the channel 112 are respectively connected to the two hemispheric-like channels 111, please refer to the schematic top view of a channel substrate 11 shown in fig. 3, and the serial connection can enable the liquid injected into the channel to flow through the hemispheric channels 111 in sequence. In the present embodiment, when the light conversion unit 10 is manufactured, only one flow channel is provided on the flow channel substrate 11, as shown in fig. 3. However, in the finished light conversion unit 10, two or more flow channels may exist on one flow channel substrate 11, because after the liquid optical material is injected into the flow channels and cured, the edge area of the flow channel substrate 11 is cut, for example, in fig. 3, the area outside the dashed line frame is removed, only the in-frame area is remained, and the cutting process divides the original flow channel into two or more flow channels, for example, in fig. 3, four flow channels are formed on the flow channel substrate 11 after the cutting.
In the present embodiment, a flow channel substrate 11 has at least three light treatment structures 12 thereon, the light treatment structures 12 are in one-to-one correspondence with the semi-sphere-like grooves 111, and one light treatment structure 12 is formed in one semi-sphere-like groove 111, so that the light treatment structure 12 has a surface that is adhered to the inner wall of the semi-sphere-like groove 111. The light processing structure 12 is an optical structure in the light conversion unit 10, in this embodiment, the light processing structure 12 in the light conversion unit 10 includes a first light processing structure 121, a second light processing structure 122, and a third light processing structure 123, which are respectively configured to process incident light with the same wavelength into red light, green light, and blue light and then emit the same wavelength, that is, the incident light with the same wavelength will become red light after passing through the first light processing structure 121, will become green light after passing through the second light processing structure 122, and will become blue light after passing through the third light processing structure 123. It is needless to say that at least one of the first light processing structure 121, the second light processing structure 122, and the third light processing structure 123 is a light conversion structure having a light wavelength conversion capability. For example, in some examples of the present embodiment, the incident light is blue light, wherein the first light processing structure 121, the second light processing structure 122 are respectively a red light conversion structure, a green light conversion structure, and the third light processing structure 123 is a light transmission structure (e.g., a light diffusion structure). In other examples, the incident light is visible violet light or ultraviolet light, and the first light processing structure 121, the second light processing structure 122, and the third light processing structure 123 are light conversion structures, which are sequentially a red light conversion structure, a green light conversion structure, and a blue light conversion structure.
In this embodiment, the first light processing structure 121, the second light processing structure 122 and the third light processing structure 123 are connected in series on the same flow channel, and the serial sequence is not specifically limited in this embodiment, correspondingly, when the light conversion unit 10 is prepared, the first light processing liquid, the second light processing liquid and the third light processing liquid can be sequentially injected into the flow channel, and the serial sequence of the three light processing liquids determines the serial sequence of the three light processing structures 12. It should be understood that the adjacent first light processing structure 121, second light processing structure 122 and third light processing structure 123 in the light conversion unit 10 correspond to one pixel point in the display panel, but in some examples, not only three sub-pixels of red, green and blue (RGB) are included in one pixel point, for example, one pixel point includes four sub-pixels of red, green and blue and yellow (RGBY), and then other kinds of light processing structures 12 should be included in the light conversion unit 10 in addition to the above three light processing structures 12. In some examples, a plurality of light handling structures 12 connected in series on the same flow channel belong to at least two different pixels, for example, in one example six light handling structures 12 are connected in series on one flow channel, the first three adjacent light handling structures 12 belonging to a first pixel and the last three adjacent light handling structures 12 belonging to a second pixel. It will be appreciated that the serial order of the light processing structures 12 corresponding to different pixels on the flow channel may be the same or different, for example, in one example, as shown in fig. 4a, along the liquid injection direction of the flow channel, the three light processing structures 12 corresponding to the first pixel are sequentially a red light conversion structure, a green light conversion structure, and a blue light conversion structure, and the three light processing structures 12 corresponding to the second pixel are sequentially a red light conversion structure, a green light conversion structure, and a blue light conversion structure; however, in another example, as shown in fig. 4b, the three light processing structures 12 corresponding to the first pixel point are sequentially a red light conversion structure, a green light conversion structure, and a blue light conversion structure, but the three light processing structures 12 corresponding to the second pixel point are sequentially a blue light conversion structure, a green light conversion structure, and a red light conversion structure.
In some examples of the present embodiment, the sizes of the various hemispherical grooves 111 corresponding to the same pixel point are different, that is, the sizes of the light processing structures 12 corresponding to the same pixel point are different, for example, in some examples, the sizes of the first light processing structure 121, the second light processing structure 122, and the third light processing structure 123 are sequentially reduced, and the sizes of the hemispherical grooves 111 naturally accommodating the three are also sequentially reduced.
The isolation structures 13 are formed in the inter-groove flow channels 112 so that they are spaced between adjacent light processing structures 12 on the flow channels, the isolation structures 13 being formed by an isolating liquid for spacing adjacent light processing structures 12. In some examples of this embodiment, the isolation structures 13 are photoresist structures with a light isolation effect, which are used to achieve light isolation between adjacent light handling structures 12, and prevent light in one light handling structure 12 from being directed towards an adjacent light handling structure 12. In some examples, the photoresist structure is composed mainly of light absorbing material, for example, formed by black glue; in other examples, the photoresist structure includes a reflective material, which has a reflective effect.
It will be appreciated that if the isolation structure 13 has a light isolation effect, it also mainly isolates light handling structures 12 adjacent in the direction of extension of the flow channels, but in some examples the light handling structures 12 on one flow channel substrate 11 will be arranged in an array, as shown in fig. 3, in which case for part of the light handling structures 12 it has not only adjacent light handling structures 12 in the row direction of the array (i.e. the direction of extension of the flow channels), but also adjacent light handling structures 12 in the column direction. Therefore, in some examples of the present embodiment, at least two channels are disposed in parallel on the channel substrate 11, and the optical isolation grooves 114 are disposed at intervals between the channels, as shown in fig. 5, and the optical isolation grooves 114 also have an optical isolation effect, so that they can reduce the optical crosstalk between the optical processing structures 12 on adjacent channels, in other words, the optical isolation grooves 114 can optically isolate the adjacent optical processing structures 12 in the direction perpendicular to the extending direction of the channels. In some examples of this embodiment, the optical isolation groove 114 is empty; in still other examples, the light-absorbing material is disposed in the light-isolating groove 114, for example, black glue with better light-absorbing performance may be filled in the light-isolating groove 114, or a layer of light-absorbing material may be coated on the inner wall of the light-isolating groove 114; in other examples, the light absorbing material in the above examples may be replaced by a refractive material, the light isolation groove 114 is filled with the refractive material, or a refractive material layer is disposed on the inner wall of the light isolation groove 114, where the refractive material used in this embodiment is a material with a refractive index greater than that of the runner substrate 11, so that a total reflection surface is formed at the inner wall of the light isolation groove 114, and when the light emitted from the light processing structure 12 reaches the light isolation groove 114, total reflection occurs, and the light will not be emitted to other adjacent light processing structures 12, so as to cause light crosstalk. In some examples, two refractive materials may be alternately laminated on the inner wall of the optical isolation groove 114, thereby forming a DBR. In still other examples, reflective material, such as a highly metallic reflective material, e.g., ag (silver), al (aluminum), pt (platinum), etc., may be disposed in the optical isolation trenches 114. In some examples of the present embodiment, the notch orientation of the light isolation groove 114 is the same as the notch orientation of the hemispheric-like groove 111, and in still other examples, the notch orientation of the light isolation groove 114 is opposite to the notch orientation of the hemispheric-like groove 111, for example, in the light conversion unit 10, the notch of the light isolation groove 114 is closer to the light incident surface of the light conversion unit 10 than the notch of the hemispheric-like groove 111.
In some examples of the present embodiment, one of the light treatment structure 12 and the isolation structure 13 is made of an aqueous phase material, and the other is made of an oil phase material, for example, the light treatment liquid forming the light treatment structure 12 is an aqueous liquid (such as an aqueous quantum dot solution), and the isolation liquid forming the isolation structure 13 is an oily liquid, and because the two liquids have large differences, the two liquids can be prevented from being mixed together when the light conversion unit 10 is prepared, so that a relatively clear boundary is formed between the light treatment structure 12 and the isolation structure 13, and the problem that the optical performance of the light treatment structure 12 is affected due to the mixing of the isolation liquid and the light treatment liquid is avoided.
In some examples of the present embodiment, the micro-structure 115 including a plurality of protrusions is disposed on the inner wall of any one of the hemispherical-like groove 111 and the inter-groove flow channel 112 on the flow channel substrate 11, and referring to fig. 6, for example, in one example, the inner wall of any one of the hemispherical-like groove 111 and the inter-groove flow channel 112 is a roughened surface. The protrusions in microstructures 115 may include, but are not limited to, pyramids, cones. It can be appreciated that the microstructure 115 can make the flow channel region where the microstructure is located have hydrophobicity, so that the difficulty of residence of the aqueous phase liquid in the region can be increased, correspondingly, the residence probability of the oil phase liquid in the region can be improved, and the oil phase liquid and the aqueous phase liquid are further demarcated. As can be seen from the above description, if the liquid in the region having the microstructure generally resides in the flow channel is an oil phase liquid, then in the preparation of the light conversion unit 10, if the light treatment liquid used is an aqueous phase liquid, then it is necessary to dispose the microstructure 115 on the inter-tank flow channel 112 so that the position of the microstructure corresponds to the position of the isolation structure 13, as shown in fig. 6; if the light treatment liquid used is an oil phase liquid, it is necessary to arrange the microstructures 115 on the inner wall of the semi-sphere-like groove 111 such that the positions of the microstructures 115 correspond to the positions of the light treatment structures 12.
In some examples of the present embodiment, the light conversion unit 10 further includes a light-transmitting cover plate 14, as shown in fig. 7a, the light-transmitting cover plate 14 is stacked with the runner substrate 11, and the notch of the hemispherical groove 111 in the runner substrate 11 faces the light-transmitting cover plate 14, so that the light-transmitting cover plate 14 covers the notch of the hemispherical groove 111. It will be appreciated that when the light conversion unit 10 is manufactured by microfluidic technology, the runner substrate 11 also needs to be matched with the runner cover plate, and even in some examples, grooves are formed on the runner substrate 11 and the runner cover plate, and a complete runner is formed after the runner substrate 11 and the runner cover plate are combined. In some examples of the present embodiment, the light-transmitting cover plate 14 is actually a flow channel cover plate used in the process of manufacturing the light conversion unit 10 based on the microfluidic technology, or the light-transmitting cover plate 14 is formed by the flow channel cover plate; in still other examples, the flow channel cover plate used in the process of preparing the light conversion unit 10 based on the microfluidic technology is completely independent of the light-transmitting cover plate 14, and after the liquid in the light conversion unit 10 is solidified, the flow channel cover plate originally used is removed, and the light-transmitting cover plate 14 is then additionally bonded to the flow channel substrate 11.
In some examples of the present embodiment, the light-transmitting cover plate 14 includes therein a DBR layer 141 and a bonding layer 142, both of which are stacked, the DBR layer 141 being bonded to the flow path substrate 11 through the bonding layer 142, the DBR layer 141 being configured to reflect the background light. In some examples of the present embodiment, the light emitting chip used with the light conversion unit 10 is a blue LED chip, and the DBR layer 141 has the function of transmitting red light and green light and reflecting blue light, in this case, the position on the DBR layer 141 corresponding to the third light processing structure 123 is hollowed out, so as to avoid the DBR layer 141 reflecting the blue light emitted from the third light processing structure 123 back, as shown in fig. 7 b. It is understood that the third light processing structure 123 is not necessarily exposed after the DBR layer 141 is hollowed out, so the position of the third light processing structure 123 is illustrated by a dashed frame in fig. 7 b. In other cases, the light emitting chip used in cooperation with the light converting unit 10 is a violet LED chip or an ultraviolet LED chip, and the DBR layer 141 is capable of transmitting red light, green light, and blue light, but may reflect violet light or ultraviolet light, in which case no hollowed-out region is required on the DBR layer 141.
It is understood that if the DBR layer 141 is included in the light-transmitting cover plate 14, a surface of the flow channel substrate 11 away from the DBR layer 141 is a light-incident surface of the light-converting unit 10. If the light-transmitting cover plate 14 is capable of transmitting light of all wavelengths, and the main function of the light-transmitting cover plate 14 in the light-converting unit 10 is to protect the light-processing structure 12 and prevent the light-processing structure 12 from being corroded by water and oxygen, which results in the optical performance degradation, then the light-incident surface of the light-converting unit 10 is not necessarily the surface of the runner substrate 11 away from the light-transmitting cover plate 14, but may be the surface of the light-transmitting cover plate 14 away from the runner substrate 11.
In some examples of the present embodiment, the light-transmitting cover plate 14 is a runner cover plate or is formed by a runner cover plate, and a plurality of hemispherical dome-like structures 140 are disposed on the light-transmitting cover plate 14, and the hemispherical dome-like structures 140 are in one-to-one correspondence with the light-processing structures 12, that is, in one-to-one correspondence with the hemispherical grooves 111 on the runner substrate 11. Also, the quasi-hemispherical dome 140 is similar in structure to the quasi-hemispherical groove 111, and in fact, the quasi-hemispherical dome 140 is a quasi-hemispherical groove provided on the light-transmitting cover plate 14. In this embodiment, the "hemispherical groove" and the "hemispherical dome" are respectively referred to merely for distinguishing the grooves on the two substrates, and in some examples of this embodiment, the names of the "hemispherical groove" and the "hemispherical dome" may be interchanged, that is, the groove provided on the flow channel substrate 11 may be referred to as "hemispherical dome", and the groove provided on the light-transmitting cover plate 14 may be referred to as "hemispherical groove". Therefore, in this embodiment, the "dome" and the "groove" are also not strictly divided up and down in spatial positions: when the light conversion unit 10 is used, if the flow channel substrate 11 is closer to the light source than the light-transmitting cover plate 14, the hemispherical groove 111 is downward, and the hemispherical dome 140 is upward; conversely, hemispherical dome 140 is below and hemispherical trough 111 is above.
In some examples of this embodiment, the opening of the semi-sphere-like dome 140 is disposed opposite the notch of the semi-sphere-like groove 111, and the light treatment structure 12 is located in both the semi-sphere-like dome 140 and the semi-sphere-like groove 111. From the foregoing description, it is known that the hemispherical dome 140 has a similar shape to the hemispherical groove 111, and the space inside the hemispherical dome is relatively close to a hemisphere. In the embodiment, the form of the hemispherical dome 140 corresponding to the hemispherical groove 111 is identical to that of the hemispherical dome 140, and the hemispherical dome 140 and the hemispherical groove 111 can be symmetrical about the interface between the flow channel substrate 11 and the transparent cover plate 14, for example, as shown in fig. 7a, under the condition that the process error is not considered, the hemispherical dome 140 and the hemispherical groove 111 are standard hemispheres, so the space formed after the hemispherical dome 140 and the hemispherical groove 111 are buckled is a sphere; in other examples, although hemispherical dome 140 conforms to the shape of hemispherical groove 111, because neither is a standard hemisphere, the space created after the snap fit is not a standard sphere, as shown in FIG. 8 a. In some examples, the semi-like groove 111 is inconsistent with the corresponding semi-like dome 140, and the shape and size of the notch of the semi-like groove 111 are matched with the shape and size of the opening of the semi-like dome 140, so that the semi-like groove 111 and the semi-like dome 140 can be guaranteed to be just buckled together, as shown in fig. 8 b. In some examples of this embodiment, the hemispherical groove 111 and the hemispherical dome 140 are not identical in shape, but the space formed by the engagement of the two is a sphere, as shown in fig. 8 c.
In the case that the light-transmitting cover plate 14 is formed based on a runner cover plate, the light-processing structures 12 are formed in the hemispherical-like dome 140 and the hemispherical-like groove 111, and if the light-processing liquid fills the sphere space formed after the hemispherical-like groove 111 and the hemispherical-like dome 140 are buckled in the microfluidic technology, the correspondingly formed light-processing structures 12 are also spherical, as shown in fig. 7a and 8 c.
In some examples of the present embodiment, the light conversion unit 10 further includes a filter layer 17, please refer to fig. 9: after the light of the light source enters the light conversion unit 10 and is processed by different light processing structures 12, the light is respectively emitted to the filter layer 17 in the forms of red light, green light and blue light, and the region corresponding to the first light processing structure 121 in the filter layer 17 transmits the red light to filter the light of other colors except the red light; the region corresponding to the second light processing structure 122 transmits green light, filtering out light of other colors than green light; the region corresponding to the third light processing structure 123 transmits blue light, filtering out light of other colors than blue light; it will be appreciated that the purity of the light emitted from the light conversion unit 10 may be made higher due to the arrangement of the filter layer 17. Although the filter layer 17 is disposed on the side of the light-transmitting cover plate 14 away from the runner substrate 11 in fig. 9, it will be understood by those skilled in the art that in some examples of the present embodiment, the light-transmitting cover plate 14 may not be disposed in the light conversion unit 10, and instead the filter layer 17 may be directly bonded to the runner substrate 11, for example, in one example, the filter layer 17 is bonded to the side of the runner substrate 11 on which the hemispherical groove 111 is located, and the filter layer 17 covers the hemispherical groove 111. In another example, the filter layer 17 is bonded to the surface of the runner substrate 11 away from the notch of the hemispherical groove 111, and it is understood that the side of the runner substrate 11 away from the filter layer 17 is the light incident side of the light conversion unit 10, in other words, the runner substrate 11 is closer to the light source than the filter layer 17, and the distance between the light incident surface of the light processing structure 12 and the filter layer 17 is greater than the distance between the light emergent surface thereof and the filter layer 17.
In some examples of the present embodiment, the light conversion unit 10 further includes a lens array layer 16, please refer to fig. 10: the lens array layer 16 includes a plurality of microlenses 160 therein, and the microlenses 160 are arrayed as shown in fig. 11. The micro lenses 160 in the lens array layer 16 are in one-to-one correspondence with the light processing structures 12, after the light of the light source enters the light conversion unit 10 and is processed by different light processing structures 12, the light is emitted to the lens array layer 16, and each micro lens 160 in the lens array layer 16 is used for performing light type adjustment on the incident light, so that the light can have a desired light emitting angle and light emitting range after passing through the lens array layer 16. Although the lens array layer 16 is disposed on the side of the light-transmitting cover plate 14 away from the flow channel substrate 11 in fig. 10, it will be understood by those skilled in the art that in some examples of the present embodiment, the light-transmitting cover plate 14 may not be disposed in the light conversion unit 10, and the lens array layer 16 may be disposed on the flow channel substrate 11, for example, in one example, the lens array layer 16 is disposed on the side of the flow channel substrate 11 on which the hemispherical groove 111 is disposed, and the lens array layer 16 covers the hemispherical groove 111. In another example, the lens array layer 16 is bonded to the surface of the runner substrate 11 away from the notch of the hemispherical groove 111, and it is understood that the side of the runner substrate 11 away from the lens array layer 16 is the light incident side of the light conversion unit 10, in other words, the runner substrate 11 is closer to the light source than the lens array layer 16, and the distance between the light incident surface of the light processing structure 12 and the lens array layer 16 is greater than the distance between the light emergent surface thereof and the lens array layer 16. In addition, it will be understood by those skilled in the art that the microlens 160 shown in fig. 10 is hemispherical, but in fact, the microlens 160 may be a rotating body in other forms.
In some examples of the present embodiment, the light conversion unit 10 may have the filter layer 17 and the lens array layer 16 disposed therein, as shown in fig. 12, and in general, the filter layer 17 is disposed between the lens array layer 16 and the runner substrate 11, for example, in fig. 12, the notch of the hemispherical groove 111 on the runner substrate 11 faces the light-transmitting cover plate 14, and the filter layer 17 is disposed on a side of the light-transmitting cover plate 14 away from the runner substrate 11 and between the lens array layer 16 and the light-transmitting cover plate 14.
The light conversion unit provided by the embodiment not only can limit the position area of the light treatment solution by utilizing the hemispherical groove, but also can improve the appearance of the light treatment structure in the light conversion unit; in addition, because different light treatment liquids and isolation liquids for isolating the light treatment liquids can be injected through the same flow channel, the arrangement of the flow channel in the microfluidic technology is simplified, and the preparation efficiency of the light conversion unit is improved. Meanwhile, because the inner space of the quasi-hemispherical groove is close to a hemisphere, even the quasi-hemispherical dome corresponding to the quasi-hemispherical groove is further arranged on the light-transmitting cover plate matched with the runner base plate, the inner space formed after the quasi-hemispherical groove and the quasi-hemispherical dome are buckled is similar to a sphere, and the light processing structure formed in the space is also similar to the sphere, so that the light processing structure can realize light wavelength conversion and simultaneously has the light beam shaping function of a lens, and the display performance of the display panel is improved.
Another alternative embodiment of the application:
in order to better understand the advantages and details of the light conversion unit in the foregoing embodiments, the preparation process of the light conversion unit will be described in this embodiment, and please refer to a schematic flow chart of the preparation method of the light conversion unit shown in fig. 13:
S1302: a flow passage is formed on the transparent substrate.
The transparent substrate may be any one of a glass substrate, a sapphire substrate, PDMS, PMMA, and the like, and the flow channel on the transparent substrate may be formed by photolithography, reverse molding, laser processing, or the like, and the flow channel substrate 11 having the flow channel is formed, as shown in fig. 3. Only one runner is provided on the runner substrate 11, and a quasi-hemispherical groove 111 and an inter-groove runner 112 connecting various types of hemispherical grooves 111 in series are included in the runner. It is needless to say that the flow channel has the liquid injection port 113, and in the present embodiment, the flow channel substrate 11 has a plurality of liquid injection ports 113, as shown in fig. 3, four liquid injection ports 113 for injecting the first light treatment liquid, the second light treatment liquid, the third light treatment liquid, and the spacer liquid into the flow channel, respectively. However, it will be understood by those skilled in the art that, in some cases, even though the liquid to be injected into the flow channel includes m kinds, the flow channel substrate 11 does not have to be provided with m kinds of liquid injection ports 113, and the number of liquid injection ports 113 may be smaller than the number of kinds of liquid to be inputted, in which case several kinds of liquid may share one liquid injection port 113. Of course, the number of the liquid filling ports 113 may be larger than the number of types of liquid required in theory. In fig. 3, the connection between the liquid injection port 113 and the flow channel body in the flow channel substrate 11 is in a T shape, the flow channel body direction is the direction of the arrow in fig. 3, part of the liquid injection port 113 is parallel to the flow channel body direction, and part of the liquid injection port 113 is perpendicular to the flow channel body direction, however, in other examples of the present embodiment, the included angle between the liquid injection port 113 and the flow channel body direction is θ, so long as 0 ° < θ < 180 ° is satisfied. In this embodiment, another flow channel substrate 11 is also shown, referring to fig. 14, in fig. 14, the liquid injection port a, the liquid injection port b, the liquid injection port c, and the liquid injection port d have a cross-shaped cross structure with the flow channel main body, respectively.
In some examples of the present embodiment, when the flow channel is provided, the microstructure 115 including a plurality of protrusions may be selectively provided on the inner wall of any one of the hemispherical-like groove 111 and the inter-groove flow channel 112, for example, if the light treatment liquid used to form the light conversion unit 10 is an aqueous quantum dot solution, the microstructure 115 may be formed on the inner wall of the inter-groove flow channel 112 when the flow channel is provided, as shown in fig. 6; if the light treatment liquid used for forming the light conversion unit 10 is an oily quantum dot solution, the microstructure 115 may be formed on the inner wall of the quasi-hemispherical groove 111 when a flow path is provided.
In some examples of the present embodiment, the flow channel substrate 11 is provided with an optical isolation groove 114 in addition to the flow channel, and the optical isolation groove 114 is provided between two adjacent rows (or columns) of hemispherical grooves 111, as shown in fig. 5. The light isolation groove 114 is formed by etching the light-transmitting substrate, and in some examples, the etching direction of the light-transmitting substrate when the light isolation groove 114 is formed is the same as the etching direction of the light-transmitting substrate when the flow channel is formed, in which case the notch of the light isolation groove 114 is oriented the same as the notch of the hemispherical groove 111; in still other examples, the direction of etching the transparent substrate when forming the optical isolation groove 114 is opposite to the direction of etching the transparent substrate when forming the flow channel, so that the notch of the optical isolation groove 114 is opposite to the notch of the quasi-hemispherical groove 111. In some examples, after the optical isolation trench 114 is etched, a reflective material, a light absorbing material, or a refractive material may be disposed in the optical isolation trench 114, and the optical material may be coated only on the inner wall of the optical isolation trench 114 or may fill the inner space of the optical isolation trench 114.
S1304: and bonding the runner base plate and the runner cover plate.
After the runner substrate 11 is prepared, the runner substrate 11 may be bonded to a runner cover plate, where the runner cover plate covers the notch of the hemispherical groove 111, and in some examples of this embodiment, hemispherical dome 140 corresponding to the hemispherical grooves 111 one to one is disposed on the runner cover plate, and an opening of the hemispherical dome 140 is buckled with the notch of the hemispherical groove 111, as shown in fig. 15 a. It will be appreciated that in some examples only hemispherical domes 140 corresponding to hemispherical grooves 111 are provided on the flow cover plate, and in still other examples grooves communicating hemispherical domes 140 are also provided on the flow cover plate, which grooves correspond to the inter-groove flow channels 112 on the flow base plate 11, in which case the flow cover plate is substantially indistinguishable from the flow base plate 11. When the runner substrate 11 and the runner cover plate are bonded, the runner substrate 11 and the runner cover plate may be laminated first, and the opening of the hemispherical dome and the notch of the hemispherical groove are arranged opposite to each other, and then the runner substrate 11 and the runner substrate are bonded by pressing.
In this embodiment, the runner cover plate is not completely removed after the formation of the optical processing structure and the isolation structure is completed, for example, the runner cover plate includes a temporary substrate layer 151 and a sacrificial layer 152, a DBR layer 141, and a bonding layer 142 sequentially disposed on the temporary substrate layer 151, and distances between the sacrificial layer 152, the DBR layer 141, and the bonding layer 142 and the temporary substrate layer 151 are sequentially increased, as shown in fig. 16. As the hemispherical dome 140 is not formed on the flow channel cover plate shown in fig. 16, it is understood that when the hemispherical dome 140 is provided on the flow channel cover plate, the hemispherical dome 140 is mainly formed on the DBR layer 141 and the bonding layer 142, and is not formed on the temporary substrate layer 151 and the sacrificial layer 152, because the temporary substrate layer 151 and the sacrificial layer 152 are subsequently removed, and only the DBR layer 141 and the bonding layer 142 remain as a light-transmitting cover plate in the light conversion unit 10.
S1306: alternately injecting light treatment liquid and isolating liquid into the flow channel.
After the flow channel substrate and the flow channel cover plate are bonded, the light treatment liquid and the isolation liquid can be alternately injected into the flow channel through the liquid injection port, and in some examples of the embodiment, the light treatment liquid contains quantum dot materials, for example, the first light treatment liquid, the second light treatment liquid and the third light treatment liquid are all aqueous quantum dot solutions or oily quantum dot solutions; in other examples, the light treatment liquid may also include a phosphor material. It is understood that part of the first light treatment liquid, the second light treatment liquid and the third light treatment liquid can be quantum dot solution, and the other part is fluorescent powder solution; it may be partly an aqueous phase liquid and partly an oil phase liquid. In addition, it is needless to say that the third light treatment liquid may be transparent adhesive or diffusion adhesive if the third light treatment structure formed of the third light treatment liquid is not required to have a light conversion function.
Theoretically, the spacer fluid may be only incompatible with the light treatment fluid, and in some examples of this embodiment, when the light treatment fluid is an oil phase fluid, the spacer fluid is an aqueous phase fluid; when the light treatment liquid is water phase liquid, the isolating liquid is oil phase liquid. In some examples of this embodiment, the spacer fluid is a photoresist, and the spacer structure formed by the photoresist has a light isolation function, so that light channeling between adjacent light processing structures can be reduced.
When the light treatment liquid and the isolating liquid are injected into the runner, the light treatment liquid and the isolating liquid are alternately injected, and a plurality of light treatment liquids are alternately injected: assuming that, in the flow channel substrate 11 shown in fig. 14, the liquid injection ports a, b, c, d are used to inject the first light treatment liquid, the second light treatment liquid, the third light treatment liquid, and the spacer liquid into the flow channel, respectively, in one example, the first light treatment liquid (for example, red light quantum dot solution) may be injected into the flow channel through the liquid injection port a, then the spacer liquid (for example, photoresist) may be injected into the flow channel through the liquid injection port d, then the second light treatment liquid (for example, green light quantum dot solution) may be injected into the flow channel through the liquid injection port b, then the spacer liquid (for example, blue light quantum dot solution or transparent glue) may be injected into the flow channel through the liquid injection port d, and finally the spacer liquid may be injected into the flow channel through the liquid injection port d. The first light processing structure 121, the isolation structure 13, the second light processing structure 122, the isolation structure 13, the third light processing structure 123, the isolation structure 13 will be formed in the flow channel in order, respectively. In this embodiment, the light treatment liquid resides in the semi-sphere-like grooves 111, and the spacer liquid resides in the inter-groove flow path 112 between two adjacent semi-sphere-like grooves 111.
S1308: and curing the light treatment liquid and the isolation liquid to form a light treatment structure and an isolation structure respectively.
After the injection by the microfluidic process is completed, the liquid (including the light treatment liquid and the spacer liquid) in the flow substrate 11 may be solidified, so that the light treatment liquid forms the light treatment structure 12 and the spacer liquid forms the spacer structure 13. In some examples of the present embodiment, the curing means for the liquid may be a heat bake curing, an ultraviolet irradiation curing, or the like. To facilitate implementation of the curing process, in some examples of this embodiment, a heat-sensitive or light-sensitive material may be added to at least one of the photo-treating fluid and the spacer fluid prior to injection by the microfluidic process.
In some examples of the present embodiment, after curing to form the light handling structure 12 and the isolation structure 13, the runner cover plate may be removed. In other examples of this embodiment, the flow channel cover plate may not be removed, and may be directly used as the light-transmitting cover plate 14 in the light conversion unit 10. In still other examples, a portion of the structure in the runner cover plate may be removed such that the runner cover plate forms the light-transmitting cover plate 14, for example, if the layer structure of the runner cover plate is as shown in fig. 16, the sacrificial layer 152 may be removed together with the temporary substrate layer 151 by removing the sacrificial layer 152 after curing the light treatment liquid and the spacer liquid, as shown in fig. 15 b.
In some examples of the present embodiment, the DBR layer 141 cannot transmit blue light, so after the sacrificial layer 152 and the temporary substrate layer 151 are removed so that the flow channel cover plate forms the light-transmitting cover plate 14, the DBR layer 141 in the light-transmitting cover plate 14 may be processed so that a region of the DBR layer 141 corresponding to the third light processing structure 123 is removed, forming a hollowed region.
In some examples of the present embodiment, after the light treatment liquid and the spacer liquid are cured, as shown in fig. 9 and 12, a filter layer 17 may be disposed, and in the present embodiment, the filter layer 17 is disposed on a surface of the light-transmitting cover plate 14 away from the flow channel substrate 11, which is used to improve the color purity of the light emitted from the light conversion unit 10 and improve the display color gamut.
In some examples of the present embodiment, after curing the light treatment liquid and the spacer liquid, the lens array layer 16 may be disposed, as shown in fig. 10 and 12, in the present embodiment, the lens array layer 16 is disposed on a side of the transparent cover plate 14 away from the flow channel substrate 11, which is used to control the light divergence angle through the micro lenses 160, in some examples of the present embodiment, the micro lenses 160 may be formed on the transparent cover plate 14 by dispensing or the like, and in other examples of the present embodiment, the lens array layer 16 may be transferred to the flow channel substrate 11 or the transparent cover plate 14 after being formed on other substrates.
In the method for manufacturing the light conversion unit provided by the embodiment, the light-transmitting runner substrate is provided with the runner, the runner comprises a plurality of quasi-hemispherical grooves and inter-groove runners connected with the quasi-hemispherical grooves in series, the light treatment structure and the isolation structure are respectively formed in the quasi-hemispherical grooves and the inter-groove runners, and the first light treatment structure, the second light treatment structure and the third light treatment structure are connected in series on the same runner, so that when the light conversion unit is manufactured, the light treatment liquid and the isolation liquid can be alternately injected into the same runner based on a microfluidic technology, the quasi-hemispherical grooves of the runner are filled with the light treatment liquid to form the light treatment structure, and the inter-groove runners between the quasi-hemispherical grooves are filled with the isolation liquid to form the isolation structure for isolating the adjacent light treatment structures. In addition, when the light treatment liquid is injected, the first light treatment liquid, the second light treatment liquid and the third light treatment liquid are alternately injected, the same flow channel can realize the preparation of three light treatment structures, and compared with the mode of forming the light conversion unit by printing and coating the light treatment liquid, the preparation scheme of the light conversion unit based on the same micro flow channel has greatly improved preparation efficiency. On the other hand, the filling position and the boundary range of the semi-sphere-like groove have a limiting effect on the light treatment liquid, so that the influence of the liquid fluidity on the quality of the light treatment structure can be reduced. Meanwhile, the hemispherical groove is hemispherical, and the light processing structure formed by the hemispherical groove is also provided with an arc surface, so that the light processing structure can realize light wavelength conversion and simultaneously has the light beam shaping function of a lens, and the display performance of the display panel is improved.
Yet another alternative embodiment of the present application:
it will be appreciated that the light conversion unit 10 in the foregoing embodiment may be directly applied to the preparation of a display panel, for example, please refer to a schematic structural diagram of a display panel shown in fig. 17:
The display panel 200 comprises a driving backboard 201 and a light emitting chip array arranged on the driving backboard 201, wherein the light emitting chip array comprises a plurality of light emitting chips 202 which are arranged in an array mode, and chip electrodes of the light emitting chips 202 are electrically connected with a driving circuit on the driving backboard 201. The light emitting chips 202 may be any of blue LED chips, violet LED chips, and ultraviolet LED chips. In some examples of the present embodiment, the light emitting chip 202 may be a Micro-LED chip, a Mini-LED chip, or a larger-sized general LED chip. In some examples of the present embodiment, the light emitting chip 202 is of a flip-chip structure, but in other examples of the present embodiment, the light emitting chip 202 may be of a vertical structure or a front-mounted structure.
In addition, the display panel 200 further includes any one of the light conversion units 10 provided in the foregoing embodiments, and in this embodiment, the main light emitting surface of the light emitting chip array faces away from the driving backplate 201 and faces the light incident surface of the light conversion unit 10. In fig. 17, a surface of the flow channel substrate 11 opposite to the notch of the hemispherical groove is a light incident surface of the light conversion unit 10, and a side of the lens array layer 16 is a light emitting side of the light conversion unit 10. Of course, it will be understood by those skilled in the art that if the positions of the lens array layer 16 and the filter layer 17 on the runner substrate 11 are opposite to the positions of the notches of the hemispherical grooves, the light incident surface of the runner substrate 11 will also be changed.
In some examples of the present embodiment, the light conversion unit 10 may be not directly applied to the preparation of the display panel 200, but the pixel unit (MIP, micro LED IN PACKAGE) is first manufactured together with the light emitting chip 202, please refer to a schematic structural diagram of the pixel unit 300 shown in fig. 18:
The pixel unit 300 includes the light conversion unit 10 and at least three light emitting chips 202, and the number of light processing structures in the light conversion unit 10 is the same as the number of light emitting chips 202, for example, if the pixel unit 300 includes three light emitting chips 202, the light conversion unit 10 includes three light processing structures, and the positions of the light processing structures correspond to the positions of the light emitting chips 202, and the light emitting surfaces of the light emitting chips 202 face the light processing structures. Furthermore, the light processing structures in the light conversion unit 10 in the pixel unit 300 include the first light processing structure 121, the second light processing structure 122, and the third light processing structure 123 at the same time, and by the processing of these three light processing structures, the pixel unit 300 can emit red light, green light, and blue light.
In some examples of the present embodiment, the pixel unit 300 further has a first pad 301 and a second pad 302, as shown in fig. 19. The first pad 301 and the second pad 302 are electrically connected to the outside of the pixel unit 300, wherein the first pad 301 is electrically connected to the first electrode of each light emitting chip 202 in the pixel unit 300, and the second pad 302 is electrically connected to the second electrode of each light emitting chip 202 in the pixel unit 300. In some examples of the present embodiment, the number of the first pads 301 in the pixel unit 300 is only one, and the number of the second pads 302 is the same as the number of the light emitting chips 202 therein, for example, when the number of the light emitting chips 202 is 3, the number of the first pads 301 in the pixel unit 300 is 1, that is, the first pads 301 are electrically connected to the first electrodes of all the light emitting chips 202 at the same time, and the number of the second pads 302 is 3, and three second pads 302 are electrically connected to the second electrodes of one light emitting chip 202. Of course, it will be understood by those skilled in the art that, in the pixel unit 300 provided in other examples of the present embodiment, all of the light emitting chips 202 or part of the light emitting chips 202 may also have the independent first pads 301.
The light conversion unit used in the display panel and the pixel unit provided in the embodiment is prepared by injecting the isolation liquid and the three light treatment liquids into a micro-channel, so that the preparation efficiency of the display panel is greatly improved. On the other hand, the filling position and the boundary range of the semi-sphere-like groove have a limiting effect on the light treatment liquid, so that the influence of the liquid fluidity on the quality of the light treatment structure can be reduced. Meanwhile, the hemispherical groove is hemispherical, and the light processing structure formed by the hemispherical groove is also provided with an arc surface, so that the light processing structure can realize light wavelength conversion and simultaneously has the light beam shaping function of a lens, and the display performance of the display panel is improved.
It is to be understood that the application is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (10)
1. A light conversion unit, comprising:
A light-transmitting flow channel substrate;
The light processing structures comprise a first light processing structure, a second light processing structure and a third light processing structure, and the three light processing structures are respectively configured to process incident light with the same wavelength into red light, green light and blue light and then emit the red light, the green light and the blue light; and
Isolation structures disposed between adjacent ones of the light processing structures;
The light processing structure and the isolation structure are respectively formed in the semi-sphere-like grooves and the inter-groove flow channels, and the first light processing structure, the second light processing structure and the third light processing structure are connected in series on the same flow channel.
2. The light conversion unit of claim 1, wherein a plurality of raised microstructures are arranged on the inner wall of any one of the hemispherical groove and the inter-groove flow channel, and the light processing structure or the isolation structure attached to the microstructures is made of an oil phase material.
3. The light conversion unit of claim 1, wherein the isolation structures are photoresist structures that optically isolate between adjacent ones of the light handling structures.
4. The light conversion unit according to claim 1, wherein the flow channel substrate is provided with at least two flow channels arranged in parallel and an optical isolation groove arranged in parallel to the flow channels, wherein any one of a light absorbing material and a light reflecting material is arranged in the optical isolation groove, and the optical isolation groove is arranged between adjacent flow channels at intervals and is configured to optically isolate the adjacent flow channels.
5. The light conversion unit according to claim 1, further comprising:
A light-transmitting cover plate laminated with the flow passage substrate; the light-transmitting cover plate is provided with hemispherical dome-like structures corresponding to the light-processing structures one by one, openings of the hemispherical dome-like structures are opposite to notches of the hemispherical groove, and the light-processing structures are located in the hemispherical dome-like structures and the hemispherical groove at the same time.
6. The light conversion unit according to any one of claims 1-5, further comprising at least one of:
the filter layer is laminated with the runner substrate, and the distance between the light incident surface of the light processing structure and the filter layer is larger than the distance between the light emergent surface of the light processing structure and the filter layer;
The lens array layer is arranged on the runner substrate in a lamination mode, the distance between the light incident surface of the light processing structure and the lens array layer is larger than the distance between the light emergent surface of the light processing structure and the lens array layer, the lens array layer comprises a plurality of microlenses arranged in an array mode, and the microlenses correspond to the positions of the light processing structure one by one.
7. A display panel, comprising:
A drive back plate;
the light-emitting chip array is arranged on the driving backboard; and
The light conversion unit according to any one of claims 1 to 6;
The light-emitting chip array comprises a plurality of light-emitting chips electrically connected with the driving backboard, and the light-emitting chips are arranged in an array manner; the light conversion unit and the driving backboard are arranged in a stacked mode and are positioned in the light emitting direction of the light emitting chip array.
8. A pixel cell, comprising:
At least three light emitting chips; and
The light conversion unit according to any one of claims 1 to 6;
The light conversion units are arranged in the light emitting direction of the light emitting chips, and the light processing structures correspond to the positions of the light emitting chips one by one.
9. A method of manufacturing a light conversion unit, comprising:
a runner is arranged on the light-transmitting substrate to form a runner substrate, and the runner comprises a plurality of semi-sphere-like grooves and inter-groove runners connected with the semi-sphere-like grooves in series;
Bonding the runner base plate and the runner cover plate;
alternately injecting light treatment liquid and isolation liquid into the flow channel, wherein the light treatment liquid and the isolation liquid respectively occupy the semi-sphere-like grooves and the flow channels between the grooves; the light treatment liquid comprises a first light treatment liquid, a second light treatment liquid and a third light treatment liquid which are alternately injected; and
And curing the light treatment liquid and the isolation liquid to form a light treatment structure and an isolation structure respectively, wherein the light treatment structure comprises a first light treatment structure, a second light treatment structure and a third light treatment structure which are respectively formed by the first light treatment liquid, the second light treatment liquid and the third light treatment liquid, and the three light treatment structures are respectively configured to treat incident light with the same wavelength into red light, green light and blue light and then emit the red light, the green light and the blue light.
10. The method of manufacturing a light conversion unit according to claim 9, wherein the flow channel cover plate comprises a light-transmitting cover plate; before bonding the runner substrate and the runner cover plate, the method further comprises:
Forming a plurality of hemispherical dome-like structures on the light-transmitting cover plate, wherein the arrangement of the hemispherical dome-like structures on the light-transmitting cover plate is consistent with the arrangement of the hemispherical grooves on the flow passage substrate;
the bonding of the runner substrate and the runner cover plate comprises:
Laminating the runner base plate and the runner cover plate, wherein the opening of the hemispherical dome and the notch of the hemispherical groove are arranged in opposite directions;
and pressing to bond the runner base plate and the runner cover plate.
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| CN202211400157.4A CN118053864A (en) | 2022-11-09 | 2022-11-09 | Light conversion unit, preparation method thereof, display panel and pixel unit |
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