WO2024098307A1 - Light conversion unit and manufacturing method therefor, display panel, and pixel unit - Google Patents

Abstract

A light conversion unit and a manufacturing method therefor, a display panel, and a pixel unit. The light conversion unit (10) comprises: a light-transmitting flow channel substrate (11), a plurality of light processing structures (12), and an isolation structure (13) arranged between every two adjacent light processing structures (12). The flow channel substrate (11) is provided with a flow channel, and the flow channel is provided with quasi-hemispherical grooves (111) having one-to-one correspondence to the light processing structures (12), and inter-groove flow channels (112) connected in series to the plurality of quasi-hemispherical grooves (111); the light processing structures (12) and the isolation structures (13) are respectively formed in the quasi-hemispherical grooves (111) and the inter-groove flow channels (112); the light processing structures (12) comprise a first light processing structure (121), a second light processing structure (122), and a third light processing structure (123), the three are respectively configured to process incident light of the same wavelength into red light, green light and blue light and then emit same, and the three are connected in series on a same flow channel.

Description

Light conversion unit and preparation method thereof, display panel and pixel unit Technical Field

The present application relates to the field of display technology, and in particular to a light conversion unit and a preparation method thereof, a display panel and a pixel unit.

Background technique

Each pixel in the full-color display panel supports red, green and blue light. There are currently two main technical means for preparing full-color display panels. One is to directly prepare LED (Light-Emitting Diode) chips that emit red, green and blue light in the quantum well layer, and then transfer and bond them to the driver backplane; the other is to use purple LED or blue LED as the light source, combined with the light conversion function of quantum dot materials to achieve full-color display. In the former method, because the LED chips need to be prepared and transferred separately, the display panel preparation process is complicated, and the light emission efficiency of the red light epitaxial layer is low, resulting in poor display effect of the display panel; although the latter method simplifies the preparation and transfer process of LED chips, if the quantum dot material is set on the light-emitting surface of the LED chip in liquid form, it is very likely that the boundaries of the quantum dot film formed will be irregular due to the fluidity of the liquid, and the morphology will not meet expectations, thereby affecting the quality of the prepared display panel. Moreover, as the size of LED chips gradually decreases, the efficiency of printing or coating quantum dot solutions on the light-emitting surfaces of each LED chip one by one to form a quantum dot film is low, and it is difficult to meet production needs.

Therefore, how to improve the morphology of quantum dot materials on light-emitting chips and enhance the production efficiency of display panels are technical issues that need to be solved urgently.

technical problem

In view of the deficiencies of the above-mentioned related technologies, the purpose of the present application is to provide a light conversion unit and a preparation method thereof, a display panel and a pixel unit, aiming to solve the problems of poor morphology of quantum dot materials of light-emitting chips and low production efficiency of display panels.

Technical Solutions

The present application first provides a light conversion unit, comprising:

Light-transmitting flow channel substrate;

A plurality of light processing structures, the light processing structures including a first light processing structure, a second light processing structure, and a third light processing structure, the three light processing structures being respectively configured to process incident light of the same wavelength into red light, green light, and blue light for output;

and an isolation structure disposed between adjacent light processing structures;

Among them, a flow channel is arranged on the flow channel substrate, and the flow channel has hemispherical grooves corresponding to the light processing structures one by one, and an inter-groove flow channel connecting multiple hemispherical grooves in series. The light processing structure and the isolation structure are respectively formed in the hemispherical grooves and the inter-groove flow channel, 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.

Based on the same inventive concept, the present application also provides a display panel, including:

Driver backplane;

A light emitting chip array disposed on a driving backplane;

and a light conversion unit as in any of the preceding items;

The light emitting chip array includes a plurality of light emitting chips electrically connected to the driving backplane, and the light emitting chips are arranged in an array; the light conversion unit and the driving backplane are stacked and located in the light emitting direction of the light emitting chip array.

Based on the same inventive concept, the present application also provides a pixel unit, including:

At least three light-emitting chips;

and the light conversion unit of any of the foregoing;

The light conversion unit is arranged in the light emitting direction of the light emitting chip, and the light processing structure corresponds to the position of the light emitting chip one by one.

Based on the same inventive concept, the present application also provides a method for preparing a light conversion unit, comprising:

A flow channel is arranged on the light-transmitting substrate to form a flow channel substrate, wherein the flow channel includes a plurality of hemispherical grooves and an inter-groove flow channel connecting the plurality of hemispherical grooves in series;

Bonding the flow channel substrate to the flow channel cover plate;

Alternately injecting a light treatment solution and an isolation solution into the flow channel, the light treatment solution and the isolation solution occupy the hemispherical groove and the inter-groove flow channel respectively; the light treatment solution includes a first light treatment solution, a second light treatment solution, and a third light treatment solution, which are alternately injected;

And the light processing solution and the isolation solution are solidified to form a light processing structure and an isolation structure respectively. The light processing structure includes a first light processing structure, a second light processing structure, and a third light processing structure respectively formed by a first light processing solution, a second light processing solution, and a third light processing solution. The three are respectively configured to process incident light of the same wavelength into red light, green light, and blue light for output.

Beneficial Effects

In the above-mentioned optical conversion unit, there is a flow channel on the light-transmitting flow channel substrate, and the flow channel includes a plurality of hemispherical grooves and inter-groove flow channels connecting the hemispherical grooves in series. The light processing structure and the isolation structure are respectively formed in the 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. Therefore, when preparing the optical conversion unit, based on microfluidic technology, the optical processing liquid and the isolation liquid can be alternately injected into the same flow channel, so that the optical processing liquid fills the hemispherical grooves of the flow channel to form the optical processing structure, and the isolation liquid fills the inter-groove flow channels between the hemispherical grooves to form an isolation structure that isolates adjacent optical processing structures. Moreover, when injecting the optical processing liquid, the first optical processing liquid, the second optical processing liquid and the third optical processing liquid are alternately injected, and the same flow channel can realize the preparation of three optical processing structures. Compared with the method of printing and coating the optical processing liquid to form the optical conversion unit, the optical conversion unit preparation scheme based on the same microfluidic channel of the present application has greatly improved the preparation efficiency. On the other hand, the hemispherical groove has a limiting effect on the filling position and boundary range of the light processing liquid, which can reduce the impact of liquid fluidity on the quality of the light processing structure. At the same time, because the hemispherical groove is hemispherical, the light processing structure formed by it also has a curved surface, which can make the light processing structure realize the light wavelength conversion while also having the beam shaping function of the lens, thereby improving the display performance of the display panel.

The light conversion unit used in the above-mentioned display panel is prepared by injecting an isolation liquid and three light processing liquids into a microchannel, which greatly improves the preparation efficiency of the display panel. On the other hand, the hemispherical groove has a limiting effect on the filling position and boundary range of the light processing liquid, which can reduce the influence of liquid fluidity on the quality of the light processing structure. At the same time, because the hemispherical groove is hemispherical, the light processing structure formed by it also has a curved surface, which can make the light processing structure have the beam shaping function of the lens while realizing light wavelength conversion, thereby improving the display performance of the display panel.

The light conversion unit used in the above-mentioned pixel unit is prepared by injecting an isolation liquid and three light processing liquids into a microchannel, which greatly improves the preparation efficiency of the pixel unit. On the other hand, the hemispherical groove has a limiting effect on the filling position and boundary range of the light processing liquid, which can reduce the influence of liquid fluidity on the quality of the light processing structure. At the same time, because the hemispherical groove is hemispherical, the light processing structure formed by it also has a curved surface, which can make the light processing structure have the beam shaping function of the lens while realizing light wavelength conversion, thereby improving the light output effect of the pixel unit, and thus enhancing the quality of the display panel made based on the pixel unit.

In the above-mentioned method for preparing a light conversion unit, there is a flow channel on a light-transmitting flow channel substrate, and the flow channel includes a plurality of hemispherical grooves and inter-groove flow channels connecting the hemispherical grooves in series. The light processing structure and the isolation structure are respectively formed in the 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. Therefore, when preparing the light conversion unit, based on microfluidic technology, light processing liquid and isolation liquid can be alternately injected into the same flow channel, so that the light processing liquid fills the hemispherical grooves of the flow channel to form a light processing structure, and the isolation liquid fills the inter-groove flow channels between the hemispherical grooves to form an isolation structure that isolates adjacent light processing structures. Moreover, when injecting the light processing liquid, the first light processing liquid, the second light processing liquid and the third light processing liquid are alternately injected, and the same flow channel can realize the preparation of three light processing structures. Compared with the method of printing and coating the light processing liquid to form a light conversion unit, the light conversion unit preparation scheme based on the same microfluidic channel of the present application has greatly improved the preparation efficiency. On the other hand, the hemispherical groove has a limiting effect on the filling position and boundary range of the light processing liquid, which can reduce the impact of liquid fluidity on the quality of the light processing structure. At the same time, because the hemispherical groove is hemispherical, the light processing structure formed by it also has a curved surface, which can make the light processing structure realize the light wavelength conversion while also having the beam shaping function of the lens, thereby improving the display performance of the display panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a first structure of a light conversion unit provided in an optional embodiment of the present application;

FIG2a is a schematic diagram of a first structure of a flow channel substrate provided in an optional embodiment of the present application;

FIG2b is a schematic diagram of a second structure of a flow channel substrate provided in an optional embodiment of the present application;

FIG2c is a schematic diagram of a third structure of a flow channel substrate provided in an optional embodiment of the present application;

FIG2d is a schematic diagram of a fourth structure of a flow channel substrate provided in an optional embodiment of the present application;

FIG3 is a schematic top view of a flow channel substrate provided in an optional embodiment of the present application;

FIG4a is a schematic diagram of a second structure of a light conversion unit provided in an optional embodiment of the present application;

FIG4b is a schematic diagram of a third structure of a light conversion unit provided in an optional embodiment of the present application;

FIG5 is a schematic diagram of a light isolation groove provided on a flow channel substrate according to an optional embodiment of the present application;

FIG6 is a schematic diagram of a fifth structure of a flow channel substrate provided in an optional embodiment of the present application;

FIG7a is a schematic diagram of a fourth structure of a light conversion unit provided in an optional embodiment of the present application;

FIG7 b is a hollow schematic diagram of a DBR (Distributed Bragg Reflection) layer shown in an optional embodiment of the present application;

FIG8a is a fifth structural schematic diagram of a light conversion unit provided in an optional embodiment of the present application;

FIG8b is a sixth structural schematic diagram of a light conversion unit provided in an optional embodiment of the present application;

FIG8c is a seventh structural schematic diagram of a light conversion unit provided in an optional embodiment of the present application;

FIG9 is a schematic diagram of an eighth structure of a light conversion unit provided in an optional embodiment of the present application;

FIG10 is a ninth structural schematic diagram of a light conversion unit provided in an optional embodiment of the present application;

FIG11 is a schematic diagram of a lens array layer shown in an optional embodiment of the present application;

FIG12 is a schematic diagram of a tenth structure of a light conversion unit provided in an optional embodiment of the present application;

FIG13 is a schematic flow chart of a method for preparing a light conversion unit provided in another optional embodiment of the present application;

FIG14 is a schematic top view of a flow channel substrate provided in another optional embodiment of the present application;

FIG15a is a schematic diagram showing the buckling of a flow channel substrate and a flow channel cover plate shown in another optional embodiment of the present application;

FIG15b is a schematic diagram showing another optional embodiment of the present application after the temporary substrate layer and the sacrificial layer of the flow channel cover plate are removed;

FIG16 is a schematic structural diagram of a flow channel substrate provided in another optional embodiment of the present application;

FIG17 is a schematic structural diagram of a display panel provided in yet another optional embodiment of the present application;

FIG18 is a schematic diagram of a structure of a pixel unit provided in yet another optional embodiment of the present application;

FIG. 19 is a bottom view schematic diagram of a pixel unit provided in yet another optional embodiment of the present application.

Description of reference numerals:

10-light conversion unit; 11-channel substrate; 111-hemispherical groove; 112-inter-groove flow channel; 113-liquid injection port; 114-light isolation groove; 115-microstructure; 12-light processing structure; 121-first light processing structure; 122-second light processing structure; 123-third light processing structure; 13-isolation structure; 14-light-transmitting cover plate; 140-hemispherical dome; 141-DBR layer; 142-bonding layer; 151-temporary substrate layer; 152-sacrificial layer; 16-lens array layer; 160-microlens; 17-filter layer; a, b, c, d-liquid injection port; 200-display panel; 201-driving backplane; 202-light-emitting chip; 300-pixel unit; 301-first pad; 302-second pad.

Embodiments of the present invention

In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

When forming light conversion units, quantum dot materials, phosphors and other light conversion materials are usually set in liquid form directly on the light-emitting surface of the LED chip or on the substrate through printing, coating and other methods. The fluidity of the liquid will greatly affect the morphology of the light conversion unit, resulting in a low yield of the prepared light conversion unit; and printing, coating and other methods may be more suitable for large-size LED chips, but with the development of Mini-LED (sub-millimeter light emitting diode) and Micro-LED (micrometer-level light emitting diode) technology, the size of LED chips used in display panels is getting smaller and smaller. If the corresponding light conversion units are prepared by printing, coating and other methods, it is not only difficult to ensure the quality of the light conversion units, but also difficult to meet the requirements of display panel production efficiency.

Based on this, the present application hopes to provide a solution that can solve the above-mentioned technical problems, the details of which will be described in the subsequent embodiments.

An optional embodiment of the present application:

This embodiment first provides a light conversion unit. Please refer to FIG. 1 which shows a cross-sectional schematic diagram of the light conversion unit 10 . 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, for example, it can be a glass substrate, a sapphire substrate, PDMS (polydimethylsiloxane), PMMA (polymethyl methacrylate), etc. The flow channel substrate 11 has two relatively large surfaces, which are distinguished by "front" and "back" in this embodiment. There is no doubt that there are other surfaces between the front and back of the flow channel substrate 11, which are referred to as "side surfaces" in this embodiment. It should be understood that for the layered flow channel substrate 11, the side surface area is much smaller than the back surface of the front or back surface.

A plurality of flow channels are arranged on one surface of the flow channel substrate 11, and one flow channel includes a plurality of hemispherical grooves 111 and an inter-groove flow channel 112 connecting the plurality of hemispherical grooves in series. First, the meaning of "hemispherical groove" is explained: the internal space of the hemispherical groove 111 is similar to a hemispherical shape. In some examples, the internal space of the hemispherical groove 111 is a standard hemispherical shape, as shown in FIG1 ; but in more examples, the internal space of the hemispherical groove 111 is not a standard hemispherical shape. For example, in the cross-sectional schematic diagram of the flow channel substrate 11 shown in FIG2a , the arc-shaped contour of the hemispherical groove 111 is only a minor arc, not a semicircle, and therefore, the internal space of the hemispherical groove 111 is not a standard hemisphere; the arc-shaped contour of the hemispherical groove 111 in FIG2b is a major arc, and the internal space of the hemispherical groove 111 is not a standard hemisphere; in some other examples, the inner wall of the hemispherical groove 111 is still an arc surface, but the arc surface is not It does not belong to the spherical surface of a certain sphere alone, but is formed by splicing spherical surface areas of two or more spheres: for example, as shown in Figure 2c, the curved inner wall of the hemispherical groove 111 is formed by splicing at least two spherical surface areas, and the spliced part is smooth, round and has no prisms; but in the hemispherical groove 111 shown in Figure 2d, the spliced part of the spherical surface area has edges and corners; in addition, in actual applications, when the hemispherical groove 111 is set on the flow channel substrate 11, the internal space of the hemispherical groove 111 may not be a standard hemisphere due to the process level, etc.; however, no matter which of the above situations is true, as long as the groove space formed on the flow channel substrate 11 is part of a sphere, or the inner wall of the groove is a curved surface, the groove belongs to the "hemispherical groove" in this embodiment.

The "series connection" of the inter-groove flow channel 112 to the hemispherical grooves 111 is similar to the connection of the beads in a string of beads. The two hemispherical grooves 111 are connected through an inter-groove flow channel 112, and the two ends of the inter-groove flow channel 112 are respectively connected to the two hemispherical grooves 111. Please refer to the top view schematic diagram of a flow channel substrate 11 shown in FIG3. This series connection relationship allows the liquid injected into the flow channel to flow through the various types of hemispherical grooves 111 in the flow channel in sequence. In this embodiment, when preparing the light conversion unit 10, there is only one flow channel on a flow channel substrate 11, as shown in FIG3. However, in the finished light conversion unit 10, there may be two or more flow channels on a flow channel substrate 11. This is because after the liquid optical material is injected into the flow channel and solidified, the edge area of the flow channel substrate 11 will be cut off. For example, in FIG3, the area outside the dotted line frame will be removed, and only the area inside the frame will be retained. This cutting process will divide the original one flow channel into two or more flow channels. For example, after cutting in FIG3, there are four flow channels on the flow channel substrate 11.

In this embodiment, at least three light processing structures 12 are provided on a flow channel substrate 11. The light processing structures 12 correspond to the hemispherical grooves 111 one by one, and one light processing structure 12 is formed in one hemispherical groove 111, so the light processing structure 12 has a surface that fits the inner wall of the hemispherical 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 of the same wavelength into red light, green light, and blue light before emitting. That is, incident light of 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 undoubted 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 the ability to convert light wavelengths. For example, in some examples of the present embodiment, the incident light is blue light, wherein the first light processing structure 121 and the second light processing structure 122 are respectively a red light conversion structure and a green light conversion structure, and the third light processing structure 123 is a light transmission structure (such as 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 all light conversion structures, which are respectively 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. The order of the series connection is not specifically limited in this embodiment. Correspondingly, when preparing the light conversion unit 10, the first light processing liquid, the second light processing liquid and the third light processing liquid can be injected into the flow channel in sequence, and the injection order of the three light processing liquids determines the series connection order of the three light processing structures 12. It should be understood that the adjacent first light processing structure 121, the second light processing structure 122 and the third light processing structure 123 in the light conversion unit 10 correspond to a pixel point in the display panel. However, in some examples, a pixel point has more than three sub-pixels of red, green and blue (RGB). For example, a pixel point includes four sub-pixels of red, green, blue and yellow (RGBY). In addition to the above three light processing structures 12, the light conversion unit 10 should also include other types of light processing structures 12. In some examples, multiple light processing structures 12 connected in series on the same flow channel belong to at least two different pixel points. For example, in one example, six light processing structures 12 are connected in series on a flow channel, the first three adjacent light processing structures 12 belong to the first pixel point, and the last three adjacent light processing structures 12 belong to the second pixel point. It can be understood that the series connection order of each light processing structure 12 corresponding to different pixel points on the flow channel can be the same or different. For example, in one example, as shown in FIG4a, along the liquid injection direction of the flow channel, the three light processing structures 12 corresponding to the first pixel point are red light conversion structure, green light conversion structure, and blue light conversion structure in sequence, and the three light processing structures 12 corresponding to the second pixel point are also red light conversion structure, green light conversion structure, and blue light conversion structure in sequence, as shown in FIG4a; but in another example, as shown in FIG4b, the three light processing structures 12 corresponding to the first pixel point are red light conversion structure, green light conversion structure, and blue light conversion structure in sequence, but the three light processing structures 12 corresponding to the second pixel point are blue light conversion structure, green light conversion structure, and red light conversion structure in sequence, as shown in FIG4b.

In some examples of this embodiment, the sizes of various hemispherical grooves 111 corresponding to the same pixel point are different, that is, the sizes of various 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 decrease successively, and naturally the sizes of the hemispherical grooves 111 that accommodate the three also decrease successively.

The isolation structure 13 is formed in the inter-groove flow channel 112, so it is spaced between adjacent light processing structures 12 on the flow channel. The isolation structure 13 is formed by an isolation liquid to space adjacent light processing structures 12. In some examples of this embodiment, the isolation structure 13 is a light blocking structure with a light isolation function, which is used to achieve light isolation between adjacent light processing structures 12 and prevent light in one light processing structure 12 from irradiating to an adjacent light processing structure 12. In some examples, the light blocking structure is mainly composed of a light absorbing material, such as formed by black glue; in other examples, the light blocking structure includes a reflective material and has a reflective function.

It is understandable that if the isolation structure 13 has a light isolation effect, it is mainly to light isolate the adjacent light processing structures 12 in the extension direction of the flow channel. However, in some examples, the light processing structures 12 on a flow channel substrate 11 are arranged in an array, as shown in FIG. 3. In this case, for some of the light processing structures

12, it has adjacent light processing structures 12 not only in the row direction of the array (i.e., the extension direction of the flow channel), but also in the column direction. Therefore, in some examples of the present embodiment, at least two flow channels are arranged in parallel on the flow channel substrate 11, and light isolation grooves 114 are arranged between the flow channels. As shown in FIG5, the light isolation grooves 114 also have a light isolation effect, so it can reduce the light crosstalk between the light processing structures 12 on adjacent flow channels. In other words, the light isolation grooves 114 can perform light isolation on adjacent light processing structures 12 in a direction perpendicular to the extension direction of the flow channels. In some examples of this embodiment, the optical isolation groove 114 is empty; in some other examples, a light-absorbing material is provided in the optical isolation groove 114, for example, black glue with good light-absorbing performance can be filled in the optical isolation groove 114, or a layer of light-absorbing material can be coated on the inner wall of the optical isolation groove 114; in some other examples, the light-absorbing material in the above examples can be replaced with a refractive material, and the refractive material can be filled in the optical isolation groove 114, or a refractive material layer can be provided on the inner wall of the optical isolation groove 114. The refractive material used in this embodiment is a material with a refractive index greater than the refractive index of the flow channel substrate 11, so that a total reflection surface will be formed on the inner wall of the optical isolation groove 114. When the light emitted by the light processing structure 12 reaches the optical isolation groove 114, total reflection will occur, and it will not be emitted to other adjacent light processing structures 12 to cause light crosstalk. In some examples, two types of refractive materials can be alternately stacked on the inner wall of the optical isolation groove 114 to form a DBR. In some other examples, the light isolation groove 114 may be provided with a reflective material, such as a highly metal reflective material, such as Ag (silver), Al (aluminum), Pt (platinum), etc. In some examples of this embodiment, the orientation of the notch of the light isolation groove 114 is the same as the orientation of the notch of the hemispherical groove 111, and in some other examples, the orientation of the notch of the light isolation groove 114 is opposite to the orientation of the notch of the hemispherical 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 hemispherical groove 111.

In some examples of the present embodiment, one of the light processing structure 12 and the isolation structure 13 is an aqueous material, and the other is an oily material. For example, the light processing liquid forming the light processing 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. Because the properties of the two are very different, when preparing the light conversion unit 10, the two liquids can be prevented from mixing together, which facilitates the formation of a clearer boundary between the light processing structure 12 and the isolation structure 13, avoiding the problem of the isolation liquid and the light processing liquid mixing and affecting the optical performance of the light processing structure 12.

On the flow channel substrate 11 provided in some examples of the present embodiment, a microstructure 115 including a plurality of protrusions is provided on the inner wall of any one of the hemispherical groove 111 and the inter-groove flow channel 112, see FIG6 , for example, in one example, the inner wall of any one of the hemispherical groove 111 and the inter-groove flow channel 112 is a roughened surface. The protrusions in the microstructure 115 may include but are not limited to being pyramidal or conical. It is understandable that the microstructure 115 can make the flow channel region where it is located hydrophobic, can increase the difficulty of the water phase liquid to stay in the region, and correspondingly can increase the probability of the oil phase liquid to stay in the region, further demarcating the oil phase liquid from the water phase liquid. According to the above introduction, it can be known that the liquid that usually resides in the area with the microstructure 115 on the flow channel is an oil-phase liquid. Therefore, when preparing the light conversion unit 10, if the light treatment liquid used is an aqueous liquid, then the microstructure 115 needs to be set on the inter-groove flow channel 112 so that the position of the microstructure 115 corresponds to the position of the isolation structure 13, as shown in Figure 6; if the light treatment liquid used is an oil-phase liquid, then the microstructure 115 needs to be set on the inner wall of the hemispherical groove 111 so that the position of the microstructure 115 corresponds to the position of the light treatment structure 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 flow channel substrate 11, and the notch of the hemispherical groove 111 in the flow channel substrate 11 faces the light-transmitting cover plate 14, so the light-transmitting cover plate 14 covers the notch of the hemispherical groove 111. It is understandable that when the light conversion unit 10 is prepared by microfluidic technology, the flow channel substrate 11 also usually needs to cooperate with the flow channel cover plate, and even in some examples, grooves are formed on both the flow channel substrate 11 and the flow channel cover plate, and the two are assembled to form a complete flow channel. In some examples of the present embodiment, the light-transmitting cover plate 14 is actually the flow channel cover plate used in the process of preparing the light conversion unit 10 based on microfluidic technology, or the light-transmitting cover plate 14 is formed by the flow channel cover plate; in some other examples, the flow channel cover plate used in the process of preparing the light conversion unit 10 based on microfluidic technology has nothing to do with the light-transmitting cover plate 14. After the liquid in the light conversion unit 10 solidifies, the originally used flow channel cover plate will be removed, and the light-transmitting cover plate 14 will be bonded to the flow channel substrate 11 thereafter.

In some examples of this embodiment, the light-transmitting cover plate 14 includes a DBR layer 141 and a bonding layer 142, which are stacked, and the DBR layer 141 is bonded to the flow channel substrate 11 through the bonding layer 142, and the DBR layer 141 is configured to reflect background light. In some examples of this embodiment, the light-emitting chip used in conjunction with the light conversion unit 10 is a blue light 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 corresponding to the third light processing structure 123 on the DBR layer 141 is hollowed out to prevent the DBR layer 141 from reflecting the blue light emitted by the third light processing structure 123 back, as shown in FIG7b. It can be understood that after the DBR layer 141 is hollowed out, the third light processing structure 123 is not necessarily exposed, so the position of the third light processing structure 123 is indicated by a dotted frame in FIG7b. In other cases, the light-emitting chip used in conjunction with the light conversion unit 10 is a purple LED chip or an ultraviolet LED chip, and the DBR layer 141 can transmit red light, green light and blue light, but can reflect purple light or ultraviolet light. In this case, there is no need to set a hollow area on the DBR layer 141.

It is understandable that if the transparent cover plate 14 includes a DBR layer 141, the side of the flow channel substrate 11 away from the DBR layer 141 is the light incident surface of the light conversion unit 10. If the transparent cover plate 14 can transmit light of all wavelengths, its main function in the light conversion unit 10 is to protect the light processing structure 12 and prevent water and oxygen from corroding the light processing structure 12 and causing its optical performance to deteriorate. In this case, the light incident surface of the light conversion unit 10 is not necessarily the side of the flow channel substrate 11 away from the transparent cover plate 14, but may also be the side of the transparent cover plate 14 away from the flow channel substrate 11.

In some examples of the present embodiment, the light-transmitting cover plate 14 is a flow channel cover plate or is formed by a flow channel cover plate, and a plurality of hemispherical domes 140 are arranged on the light-transmitting cover plate 14, and the hemispherical domes 140 correspond one-to-one with the light processing structure 12, that is, one-to-one with the hemispherical grooves 111 on the flow channel substrate 11. Moreover, the structure of the hemispherical dome 140 is similar to that of the hemispherical groove 111. In fact, the hemispherical dome 140 is also a hemispherical groove arranged on the light-transmitting cover plate 14. The reason why they are respectively called "hemispherical groove" and "hemispherical dome" in the present embodiment is only to distinguish the grooves on the two substrates. In some examples of the present embodiment, the names of "hemispherical groove" and "hemispherical dome" can be interchangeable, that is, the groove arranged on the flow channel substrate 11 can be called "hemispherical dome", and the groove arranged on the light-transmitting cover plate 14 can be called "hemispherical groove". Therefore, in this embodiment, there is no strict distinction between the "dome" and the "groove" in terms of the spatial position: 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 at the bottom and the hemispherical dome 140 is at the top; otherwise, the hemispherical dome 140 is at the bottom and the hemispherical groove 111 is at the top.

In some examples of this embodiment, the opening of the quasi-hemispherical dome 140 is arranged opposite to the notch of the quasi-hemispherical groove 111, and the light processing structure 12 is located in the quasi-hemispherical dome 140 and the quasi-hemispherical groove 111 at the same time. According to the above introduction, the morphology of the quasi-hemispherical dome 140 is similar to that of the quasi-hemispherical groove 111, and the space inside the two is relatively close to a hemisphere. In this embodiment, the morphology of a quasi-hemispherical groove 111 is consistent with that of the quasi-hemispherical dome 140 corresponding thereto, and the two can be symmetrical about the interface between the flow channel substrate 11 and the transparent cover plate 14. For example, please refer to FIG. 7a. Without considering the process error, the quasi-hemispherical dome 140 and the quasi-hemispherical groove 111 are both standard hemispheres, so the space formed by the quasi-hemispherical dome 140 and the quasi-hemispherical groove 111 after buckling is a sphere; in other examples, although the quasi-hemispherical dome 140 and the quasi-hemispherical groove 111 have the same morphology, because both are not standard hemispheres, the space formed after buckling is not a standard sphere, as shown in FIG. 8a. In some other examples, the quasi-hemispherical groove 111 is not consistent with the corresponding quasi-hemispherical dome 140 in shape, and the shape and size of the notch of the quasi-hemispherical groove 111 match the shape and size of the opening of the quasi-hemispherical dome 140, so that the quasi-hemispherical groove 111 and the quasi-hemispherical dome 140 can be exactly buckled together, as shown in Figure 8b. In some examples of this embodiment, although the quasi-hemispherical groove 111 and the quasi-hemispherical dome 140 are not consistent in shape, the space formed by the two after buckling is a sphere, as shown in Figure 8c.

When the light-transmitting cover plate 14 is formed based on the flow channel cover plate, the light processing structure 12 is formed in the hemispherical dome 140 and the hemispherical groove 111. If, in the microfluidic process, the light processing liquid fills the spherical space formed by the hemispherical groove 111 and the hemispherical dome 140 being buckled together, then the corresponding light processing structure 12 is also spherical, as shown in Figures 7a and 8c.

In some examples of the present embodiment, the light conversion unit 10 also includes a filter layer 17, see Figure 9: after the light from the light source enters the light conversion unit 10, it is processed by different light processing structures 12 and then emitted to the filter layer 17 in the form of red light, green light and blue light respectively. The area corresponding to the first light processing structure 121 in the filter layer 17 transmits red light and filters out light of other colors except red light; the area corresponding to the second light processing structure 122 transmits green light and filters out light of other colors except green light; the area corresponding to the third light processing structure 123 transmits blue light and filters out light of other colors except blue light. It can be understood that due to the setting of the filter layer 17, the light emitted from the light conversion unit 10 can be made purer. In FIG9 , although the filter layer 17 is disposed on the side of the transparent cover plate 14 away from the flow channel substrate 11, it can be understood by those skilled in the art that, in some examples of the present embodiment, the transparent cover plate 14 may not be disposed in the light conversion unit 10, but the filter layer 17 is directly bonded to the flow channel substrate 11. For example, in one example, the filter layer 17 is bonded to the side of the flow channel substrate 11 where the notch of the hemispherical groove 111 is located, and the filter layer 17 covers the notch of the hemispherical groove 111. In another example, the filter layer 17 is bonded to the side of the flow channel substrate 11 away from the notch of the hemispherical groove 111. It can be understood that the side of the flow channel substrate 11 away from the filter layer 17 is the light incident side of the light conversion unit 10. In other words, the flow channel 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 exit surface of the light processing structure 12 and the filter layer 17.

In some examples of the present embodiment, the light conversion unit 10 further includes a lens array layer 16, see FIG10 : the lens array layer 16 includes a plurality of micro lenses 160, and these micro lenses 160 are arranged in an array, as shown in FIG11 . The micro lenses 160 in the lens array layer 16 correspond one-to-one to the light processing structure 12. After the light from the light source enters the light conversion unit 10, it is processed by different light processing structures 12 and then emitted to the lens array layer 16. Each micro lens 160 in the lens array layer 16 is used to adjust the light type of the incident light, so that the light can have a desired light output angle and light output range after passing through the lens array layer 16. In FIG. 10 , although the lens array layer 16 is disposed on the side of the transparent cover plate 14 away from the flow channel substrate 11, it can be understood by those skilled in the art that, in some examples of the present embodiment, the transparent cover plate 14 may not be disposed in the light conversion unit 10, but the lens array layer 16 is 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 where the notch of the hemispherical groove 111 is located, and the lens array layer 16 covers the notch of the hemispherical groove 111. In another example, the lens array layer 16 is bonded to the side of the flow channel substrate 11 away from the notch of the hemispherical groove 111. It can be understood that the side of the flow channel substrate 11 away from the lens array layer 16 is the light incident side of the light conversion unit 10. In other words, the flow channel 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 its light emitting surface and the lens array layer 16. In addition, those skilled in the art will appreciate that, although the microlens 160 shown in FIG. 10 is hemispherical, in fact, the microlens 160 may also be a rotating body in other shapes.

In some examples of this embodiment, a filter layer 17 and a lens array layer 16 can be simultaneously provided in the light conversion unit 10, as shown in FIG12. Typically, the filter layer 17 is provided between the lens array layer 16 and the flow channel substrate 11. For example, in FIG12, the notch of the hemispherical groove 111 on the flow channel substrate 11 faces the transparent cover plate 14, and the filter layer 17 is provided on the side of the transparent cover plate 14 away from the flow channel substrate 11, and is located between the lens array layer 16 and the transparent cover plate 14.

The light conversion unit provided in this embodiment can not only use the hemispherical groove to limit the position area of the light treatment solution, and improve the morphology of the light treatment structure in the light conversion unit; moreover, because different light treatment liquids and the isolation liquid for isolating the light treatment liquid can be injected through the same flow channel, this simplifies the flow channel setting in the microfluidic process, which is conducive to improving the preparation efficiency of the light conversion unit. At the same time, because the internal space of the hemispherical groove is close to a hemisphere, and even the transparent cover plate matched with the flow channel substrate is also provided with a hemispherical dome corresponding to the hemispherical groove, the hemispherical groove and the hemispherical dome are buckled to form an internal space similar to a sphere, and the light treatment structure formed in the space is also close to a sphere, so that the light treatment structure can realize the light wavelength conversion while having the beam shaping function of the lens, thereby improving the display performance of the display panel.

Another optional embodiment of the present application:

In order to enable those skilled in the art to better understand the advantages and details of the light conversion unit in the above-mentioned embodiment, this embodiment will introduce the preparation process of the light conversion unit. Please refer to a flow chart of a method for preparing the light conversion unit shown in FIG. 13 :

S1302: Disposing a flow channel on the light-transmitting substrate to form a flow channel substrate.

The transparent substrate can be any one of a glass substrate, a sapphire substrate, PDMS, PMMA, etc. The flow channel on the transparent substrate can be formed by photolithography or laser processing to form a flow channel substrate with a flow channel.

11, as shown in FIG3. There is only one flow channel arranged on the flow channel substrate 11, and the flow channel includes a hemispherical groove 111 and an inter-groove flow channel 112 connecting various types of hemispherical grooves 111 in series. It is undoubted that the flow channel has a liquid injection port 113. In this embodiment, the flow channel substrate 11 has multiple liquid injection ports 113, as shown in FIG3, four liquid injection ports 113, and these four liquid injection ports 113 are respectively used to inject the first light treatment liquid, the second light treatment liquid, the third light treatment liquid and the isolation liquid into the flow channel. However, it can be understood by those skilled in the art that in some cases, even if the liquid to be injected into the flow channel includes m kinds, it is not necessary to set m liquid injection ports 113 on the flow channel substrate 11, and the number of liquid injection ports 113 can be less than the number of types of liquids to be input. In this case, several liquids may share one liquid injection port 113. Of course, in theory, the number of liquid injection ports can also be more than the number of types of liquids required. The connection between the injection port 113 and the flow channel body in the flow channel substrate 11 shown in FIG3 is in a "T" shape, and the flow channel body is in the direction of the arrow in FIG3. In FIG3, part of the injection port 113 is parallel to the flow channel body, and part of the injection port 113 is perpendicular to the flow channel body. However, in some other examples of this embodiment, the angle between the injection port 113 and the flow channel body is θ, as long as 0°＜θ＜180° is satisfied. This embodiment also shows another flow channel substrate 11, as shown in FIG14, in which the injection port a, injection port b, injection port c and injection port d respectively have a "cross" structure with the flow channel body.

In some examples of this embodiment, when setting the flow channel, a microstructure 115 comprising multiple protrusions can be selected to be set on the inner wall of any one of the hemispherical 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, then when setting the flow channel, the microstructure 115 can be formed on the inner wall of the inter-groove flow channel 112, as shown in Figure 6; if the light treatment liquid used to form the light conversion unit 10 is an oily quantum dot solution, then when setting the flow channel, the microstructure 115 can be formed on the inner wall of the hemispherical groove 111.

In some examples of this embodiment, in addition to the flow channel, the flow channel substrate 11 is also provided with an optical isolation groove 114, which is arranged between two adjacent rows (or columns) of hemispherical grooves 111, as shown in Figure 5. The optical isolation groove 114 is formed by etching the light-transmitting substrate. In some examples, the etching direction of the light-transmitting substrate when forming the optical isolation groove 114 is the same as the etching direction of the light-transmitting substrate when forming the flow channel. In this case, the notch of the optical isolation groove 114 is in the same direction as the notch of the hemispherical groove 111; in some other examples, the etching direction of the light-transmitting substrate when forming the optical isolation groove 114 is opposite to the etching direction of the light-transmitting substrate when forming the flow channel, so the notch of the optical isolation groove 114 is opposite to the notch of the hemispherical groove 111. In some examples, after etching to form the optical isolation groove 114 , a reflective material, a light absorbing material, or a refractive material may be disposed in the optical isolation groove 114 . These optical materials may be coated only on the inner wall of the optical isolation groove 114 , or may fill the inner space of the optical isolation groove 114 .

S1304: Bonding the flow channel substrate and the flow channel cover plate.

After the flow channel substrate 11 is prepared, the flow channel substrate 11 can be bonded to the flow channel cover plate, and the flow channel cover plate covers the notch of the quasi-hemispherical groove 111. In some examples of the present embodiment, the flow channel cover plate is provided with a quasi-hemispherical dome 140 corresponding to the quasi-hemispherical groove 111, and the opening of the quasi-hemispherical dome 140 is buckled with the notch of the quasi-hemispherical groove 111, as shown in FIG15a. It can be understood that in some examples, only the quasi-hemispherical dome 140 corresponding to the quasi-hemispherical groove 111 is provided on the flow channel cover plate, and in some other examples, a groove connecting the quasi-hemispherical dome 140 is also provided on the flow channel cover plate, and the groove corresponds to the inter-groove flow channel 112 on the flow channel substrate 11. In this case, the flow channel cover plate is basically no different from the flow channel substrate 11. When bonding the flow channel substrate 11 and the flow channel cover plate, the flow channel substrate 11 and the flow channel cover plate can be stacked first, and the opening of the hemispherical dome and the notch of the hemispherical groove are arranged opposite to each other, and then pressure is applied to bond the flow channel substrate 11 and the flow channel substrate.

In this embodiment, the flow channel cover plate will not be completely removed after the light processing structure and the isolation structure are formed. For example, the flow channel cover plate includes a temporary substrate layer 151 and a sacrificial layer 152, a DBR layer 141, and a bonding layer 142 sequentially arranged on the temporary substrate layer 151, and the distances between the sacrificial layer 152, the DBR layer 141, and the bonding layer 142 and the temporary substrate layer 151 increase in sequence, as shown in FIG16. The flow channel cover plate shown in FIG16 has not yet formed a quasi-hemispherical dome 140. It can be understood that when the quasi-hemispherical dome 140 is arranged on the flow channel cover plate, the quasi-hemispherical dome 140 is mainly formed on the DBR layer 141 and the bonding layer 142, and will not be formed on the temporary substrate layer 151 and the sacrificial layer 152. This is because the temporary substrate layer 151 and the sacrificial layer 152 will be removed later, and only the DBR layer 141 and the bonding layer 142 will remain in the light conversion unit 10 as a light-transmitting cover plate.

S1306: Alternately injecting photoprocessing liquid and isolation liquid into the flow channel.

After bonding the flow channel substrate and the flow channel cover plate, the light treatment liquid and the isolation liquid can be alternately injected into the flow channel through the injection port. In some examples of the present 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 can also contain phosphor materials. It is understandable that part of the first light treatment liquid, the second light treatment liquid, and the third light treatment liquid can be a quantum dot solution, and the other part can be a phosphor solution; part can be an aqueous phase liquid, and the other part can be an oil phase liquid. In addition, there is no doubt that if the third light treatment structure formed by the third light treatment liquid is not required to have a light conversion function, the third light treatment liquid can be a transparent glue or a diffusion glue.

Theoretically, the isolation liquid only needs to be insoluble in the photoprocessing liquid. In some examples of this embodiment, when the photoprocessing liquid is an oil phase liquid, the isolation liquid is an aqueous phase liquid; when the photoprocessing liquid is an aqueous phase liquid, the isolation liquid is an oil phase liquid. In some examples of this embodiment, the isolation liquid is a photoresist, and the isolation structure formed by the isolation liquid has a light isolation function, which can reduce the light crosstalk between adjacent photoprocessing structures.

When injecting phototreatment liquid and isolation liquid into the flow channel, the two are injected alternately, and the several phototreatment liquids are also injected alternately: assuming that in the flow channel substrate 11 shown in Figure 14, the injection port a, injection port b, injection port c, and injection port d are respectively used to inject the first phototreatment liquid, the second phototreatment liquid, the third phototreatment liquid, and the isolation liquid into the flow channel. In one example, the first phototreatment liquid (for example, a red light quantum dot solution) can be first injected into the flow channel through the injection port a, and then the isolation liquid (for example, a photoresist) can be injected into the flow channel through the injection port d, and then the second phototreatment liquid (for example, a green light quantum dot solution) can be injected through the injection port b, and then the isolation liquid can be injected into the flow channel through the injection port d, and then the third phototreatment liquid (for example, a blue light quantum dot solution or transparent glue) can be injected through the injection port c, and finally the isolation liquid is injected into the flow channel through the injection port d. This process is continuously cycled in the microfluidic process. Correspondingly, 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, and the isolation structure 13 are sequentially formed in the flow channel. In this embodiment, the light processing liquid resides in the hemispherical groove 111, and the isolation liquid resides in the inter-groove flow channel 112 between two adjacent hemispherical grooves 111.

S1308: Solidify the phototreatment liquid and the isolation liquid to form a phototreatment structure and an isolation structure, respectively. After the liquid injection through the microfluidic process is completed, the liquid in the flow channel substrate 11 (including the phototreatment liquid and the isolation liquid) can be solidified so that the phototreatment liquid forms the phototreatment structure 12, and the isolation liquid forms the isolation structure 13. In some examples of the present embodiment, the liquid can be solidified by heating and baking, ultraviolet irradiation, etc. In order to facilitate the implementation of the curing process, in some examples of the present embodiment, a heat-sensitive or photosensitive material can be added to at least one of the phototreatment liquid and the isolation liquid before the liquid is injected through the microfluidic process.

In some examples of this embodiment, the flow channel cover plate can be removed after curing to form the light processing structure 12 and the isolation structure 13. In other examples of this embodiment, the flow channel cover plate may not be removed, and the flow channel cover plate may be directly used as the light-transmitting cover plate 14 in the light conversion unit 10. In some other examples, part of the structure in the flow channel cover plate may be removed so that the flow channel cover plate forms the light-transmitting cover plate 14. For example, if the layer structure of the flow channel cover plate is as shown in FIG16, then after curing the light processing liquid and the isolation liquid, the sacrificial layer 152 may be removed so that the sacrificial layer 152 and the temporary substrate layer 151 are removed together, as shown in FIG15b.

In some examples of this embodiment, the DBR layer 141 cannot transmit blue light, so after removing the sacrificial layer 152 and the temporary substrate layer 151 so that the flow channel cover plate forms a light-transmitting cover plate 14, the DBR layer 141 in the light-transmitting cover plate 14 can be processed so that the area on the DBR layer 141 corresponding to the third light processing structure 123 is removed to form a hollow area.

In some examples of this embodiment, after curing the light processing liquid and the isolation liquid, a filter layer 17 can be set, as shown in Figures 9 and 12. In this embodiment, the filter layer 17 is set on the side of the transparent cover plate 14 away from the flow channel substrate 11, which is used to improve the color purity of the light output by the light conversion unit 10 and improve the display color gamut.

In some examples of this embodiment, after curing the light treatment liquid and the isolation liquid, a lens array layer 16 may be provided, as shown in FIG. 10 and FIG. 12. In this embodiment, the lens array layer 16 is provided on a side of the light-transmitting cover plate 14 away from the flow channel substrate 11, and is used to control the light divergence angle through the microlens 160. In some examples of this embodiment, the microlens 160 may be formed on the light-transmitting cover plate 14 by dispensing or the like. In other examples of this embodiment, the lens array layer 16 may also be

After being formed on other substrates, they are transferred to the flow channel substrate 11 or the transparent cover plate 14 .

The method for preparing a light conversion unit provided in this embodiment has a flow channel on a light-transmitting flow channel substrate, the flow channel includes a plurality of hemispherical grooves and an inter-groove flow channel connecting the hemispherical grooves in series, the light processing structure and the isolation structure are respectively formed in the hemispherical grooves and the inter-groove flow channel, 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, so when preparing the light conversion unit, the light processing liquid and the isolation liquid can be alternately injected into the same flow channel based on microfluidic technology, so that

The semi-spherical grooves of the light-processing liquid-filled flow channel form a light-processing structure, while the isolation liquid fills the inter-groove flow channels between the semi-spherical grooves to form an isolation structure that isolates adjacent light-processing structures. Moreover, when injecting the light-processing liquid, the first light-processing liquid, the second light-processing liquid and the third light-processing liquid are injected alternately, and the same flow channel can realize the preparation of three light-processing structures. Compared with the method of printing and coating the light-processing liquid to form a light conversion unit, the light conversion unit preparation scheme based on the same microchannel of the present application has greatly improved the preparation efficiency. On the other hand, the semi-spherical groove has a limiting effect on the filling position and boundary range of the light-processing liquid, which can reduce the influence of liquid fluidity on the quality of the light-processing structure. At the same time, because the semi-spherical groove is semi-spherical, the light-processing structure formed by its accommodation also has a curved surface, which can make the light-processing structure have the beam shaping function of the lens while realizing the light wavelength conversion, thereby improving the display performance of the display panel.

Another optional embodiment of the present application:

It can be understood that the light conversion unit 10 in the above-mentioned embodiment can be directly applied to the preparation of a display panel. For example, please refer to the structural schematic diagram of a display panel shown in FIG. 17 :

The display panel 200 includes a driving backplane 201 and a light-emitting chip array disposed on the driving backplane 201. The light-emitting chip array includes a plurality of light-emitting chips 202 arranged in an array, and the chip electrodes of the light-emitting chips 202 are electrically connected to the driving circuit on the driving backplane 201. These light-emitting chips 202 can be any one of a blue light LED chip, a purple light LED chip, and an ultraviolet light LED chip. In some examples of the present embodiment, the light-emitting chip 202 can be a Micro-LED chip, a Mini-LED chip, or a larger ordinary LED chip. In some examples of the present embodiment, the light-emitting chip 202 is a flip-chip structure, but in some other examples of the present embodiment, the light-emitting chip 202 can also be a vertical structure or a normal structure.

In addition, the display panel 200 also includes any one of the light conversion units 10 provided in the aforementioned embodiments. In this embodiment, the main light emitting surface of the light emitting chip array faces away from the driving backplane 201 and faces the light incident surface of the light conversion unit 10. In FIG17 , the side of the flow channel substrate 11 opposite to the notch of the hemispherical groove is the light incident surface of the light conversion unit 10, and the side where the lens array layer 16 is located is the light emitting side of the light conversion unit 10. Of course, those skilled in the art can understand that if the positions of the lens array layer 16 and the filter layer 17 on the flow channel substrate 11 are opposite to the positions where the notch of the hemispherical groove is located, then the light incident surface of the flow channel substrate 11 will also change.

In some examples of this embodiment, the light conversion unit 10 may not be directly applied to the preparation of the display panel 200, but may be first made into a pixel unit (MIP, MicroLED in Package) together with the light emitting chip 202, as shown in FIG. 18 , which is a schematic structural diagram of a pixel unit 300:

The pixel unit 300 includes a light conversion unit 10 and at least three light emitting chips 202. 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 there are three light emitting chips 202 in the pixel unit 300, 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. Moreover, the light processing structures in the light conversion unit 10 in the pixel unit 300 also include a first light processing structure 121, a second light processing structure 122, and a third light processing structure 123. Through 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 this embodiment, the pixel unit 300 further has a first pad 301 and a second pad 302, as shown in FIG19. The first pad 301 and the second pad 302 are structures for electrically connecting the pixel unit 300 to the outside, 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 this embodiment, the first pad 301 and the second pad 302 are electrically connected to the second electrode of each light emitting chip 202 in the pixel unit 300.

There is only one first pad 301, and the number of second pads 302 is the same as the number of light-emitting chips 202. For example, when the number of light-emitting chips 202 is 3, the number of first pads 301 in the pixel unit 300 is 1, that is, the first pad 301 is electrically connected to the first electrodes of all light-emitting chips 202 at the same time, and the number of second pads 302 is 3, and the three second pads 302 are respectively electrically connected to the second electrode of one light-emitting chip 202. Of course, those skilled in the art can understand that in the pixel unit 300 provided in some other examples of the present embodiment, all or part of the light-emitting chips 202 can also have independent first pads 301.

The light conversion unit used in the display panel and pixel unit provided in this embodiment is prepared by injecting an isolation liquid and three light processing liquids into a microchannel, which greatly improves the preparation efficiency of the display panel. On the other hand, the hemispherical groove has a limiting effect on the filling position and boundary range of the light processing liquid, which can reduce the influence of liquid fluidity on the quality of the light processing structure. At the same time, because the hemispherical groove is hemispherical, the light processing structure formed by it also has a curved surface.

In this way, the light processing structure can realize light wavelength conversion while also having the beam shaping function of the lens, thereby improving the display performance of the display panel.

It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims (18)

1. A light conversion unit, comprising:

   Light-transmitting flow channel substrate;

   A plurality of light processing structures, wherein the light processing structures include a first light processing structure, a second light processing structure, and a third light processing structure, which are respectively configured to process incident light of the same wavelength into red light, green light, and blue light for output;

   and an isolation structure disposed between adjacent light processing structures;

   Among them, a flow channel is arranged on the flow channel substrate, and the flow channel has hemispherical grooves corresponding to the light processing structures one by one, and an inter-groove flow channel connecting multiple hemispherical grooves in series, the light processing structure and the isolation structure are respectively formed in the hemispherical grooves and the inter-groove flow channel, 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 according to claim 1, wherein one of the light processing structure and the isolation structure is made of a water-phase material, and the other is made of an oil-phase material.
3. The light conversion unit according to claim 1, wherein a plurality of protruding microstructures are provided 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 arranged in contact with the microstructure is made of an oil phase material.
4. The light conversion unit according to claim 1, wherein the isolation structure is a light blocking structure for performing light isolation between adjacent light processing structures.
5. The light conversion unit as described in claim 1, wherein the flow channel substrate is provided with at least two parallel arranged flow channels and a light isolation groove arranged parallel to the flow channels, and the light isolation groove is provided with any one of a light absorbing material and a light reflecting material, which is arranged at intervals between adjacent flow channels and is configured to optically isolate adjacent flow channels.
6. The light conversion unit according to claim 1, wherein the light conversion unit further comprises:

   A light-transmitting cover plate is stacked with the flow channel substrate; a hemispherical dome corresponding to the light processing structure is arranged on the light-transmitting cover plate, the opening of the hemispherical dome is arranged opposite to the notch of the hemispherical groove, and the light processing structure is located in the hemispherical dome and the hemispherical groove at the same time.
7. The light conversion unit of claim 6, wherein the light processing structure is spherical.
8. The light conversion unit according to claim 6, wherein the light-transmitting cover plate comprises a distributed Bragg reflector layer and a bonding layer, and the bonding layer laminates and bonds the distributed Bragg reflector layer and the flow channel substrate together.
9. The light conversion unit according to claim 8, wherein the distributed Bragg reflector layer is hollowed out in a region corresponding to the third light processing structure.
10. The light conversion unit according to claim 1, wherein the light conversion unit further comprises:

    The filter layer is stacked with the flow channel substrate, and the distance between the light incident surface of the light processing structure and the filter layer is greater than the distance between the light exit surface of the light processing structure and the filter layer.
11. The light conversion unit according to claim 1, wherein the light conversion unit further comprises:

    A lens array layer is stacked with the flow channel substrate, and the distance between the light incident surface of the light processing structure and the lens array layer is greater than the distance between the light exit surface of the light processing structure and the lens array layer, and the lens array layer includes a plurality of micro lenses arranged in an array, and the positions of the micro lenses and the light processing structure correspond one to one.
12. A display panel, comprising:

    Driver backplane;

    A light emitting chip array disposed on the driving backplane; and

    The light conversion unit according to claim 1;

    The light emitting chip array includes a plurality of light emitting chips electrically connected to the driving backplane, and the light emitting chips are arranged in an array; the light conversion unit is stacked with the driving backplane and is located in the light emitting direction of the light emitting chip array.
13. A pixel unit, comprising:

    At least three light-emitting chips;

    and the light conversion unit as claimed in claim 1;

    The light conversion unit is arranged in the light emitting direction of the light emitting chip, and the light processing structure corresponds to the position of the light emitting chip one by one.
14. A method for preparing a light conversion unit, comprising:

    A flow channel is arranged on the light-transmitting substrate to form a flow channel substrate, wherein the flow channel includes a plurality of hemispherical grooves and an inter-groove flow channel connecting the plurality of hemispherical grooves in series;

    Bonding the flow channel substrate to the flow channel cover plate;

    Alternately injecting a light treatment liquid and a spacer liquid into the flow channel, the light treatment liquid and the spacer liquid occupy the hemispherical groove and the inter-groove flow channel respectively; the light treatment liquid includes a first light treatment liquid, a second light treatment liquid, and a third light treatment liquid, which are alternately injected;

    And the light processing liquid and the isolation liquid are solidified to form a light processing structure and an isolation structure respectively; the light processing structure includes a first light processing structure, a second light processing structure, and a third light processing structure respectively formed by the first light processing liquid, the second light processing liquid, and the third light processing liquid, and the three are respectively configured to process incident light of the same wavelength into red light, green light, and blue light for output.
15. The method for preparing a light conversion unit as described in claim 14, wherein, when the flow channel is set on the transparent substrate to form a flow channel substrate, it also includes setting a microstructure comprising a plurality of protrusions on the inner wall of any one of the hemispherical groove and the inter-groove flow channel.
16. The method for preparing a light conversion unit according to claim 14, wherein the flow channel cover plate comprises a light-transmitting cover plate; before bonding the flow channel substrate to the flow channel cover plate, the method further comprises: forming a plurality of hemispherical domes on the light-transmitting cover plate, wherein the arrangement of the plurality of hemispherical domes on the light-transmitting cover plate is consistent with the arrangement of the plurality of hemispherical grooves on the flow channel substrate;

    The bonding of the flow channel substrate and the flow channel cover plate comprises: stacking the flow channel substrate and the flow channel cover plate, and arranging the opening of the hemispherical dome and the notch of the hemispherical groove facing each other;

    The flow channel substrate is bonded to the flow channel substrate by applying pressure.
17. The method for preparing a light conversion unit according to claim 16, wherein after curing the light treatment liquid and the isolation liquid, the method further comprises:

    A filter layer is arranged on a surface of the light-transmitting cover plate away from the flow channel substrate.
18. The method for preparing a light conversion unit according to claim 16, wherein after curing the light treatment liquid and the isolation liquid, the method further comprises:

    A plurality of micro lenses arranged in an array are disposed on a surface of the light-transmitting cover plate away from the flow channel substrate to form a lens array layer, and the positions of the micro lenses and the light processing structures correspond one to one.