Micro LED self-assembly method based on DNA base complementary pairing

Abstract

The invention discloses a Mi cro LED self-assembly method based on DNA base complementary pairing. The method comprises the following steps that S1, DNA single-chain molecular base pairs are introduced to the light emitting face of a Mi cro LED chip through chemical reaction; s2, the surface of the specific position of the target substrate is treated, so that DNA single-stranded molecular base pairs complementarily paired with the surface of the Mi cro LED chip are introduced through a chemical reaction; s3, immersing the Mi cro LED chip and the substrate into a fluid containing an active component for protecting the DNA chain; s4, the Mi cro LED chips are evenly distributed to all positions of the substrate through acting force, and automatic arrangement and assembly of the Mi cro LED chips are achieved through the basic group complementary pairing effect of DNA single-chain molecules on the surfaces of the corresponding Mi cro LED chips and DNA single-chain molecules between the surfaces of the substrate; s5, the redundant Mi cro LED chips on the surface of the substrate are taken away by fluid and cleaned, and then subsequent planarization and rewiring processing are carried out; according to the invention, a simple and efficient self-assembly process is realized, high-precision transfer and low-cost production of the Mi cro LED chip are completed, and the Mi cro LED chip has a wide market application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field related to mass transfer, and in particular to a MicroLED self-assembly method based on DNA base complementary pairing. Background Art

[0002] As we all know, the key technology to realize Micro LED display screen is mass transfer. Micro LED is one of the most competitive display technologies in the future. It has the characteristics of self-luminescence, bright colors, high contrast, high brightness, low energy consumption and long life. However, the current manufacturing cost of Micro LED display exceeds $100K (4K,>100 inches). If the cost barrier can be overcome, it will drive the overall market and create more new market application areas.

[0003] How to significantly reduce the cost of Micro LED has become the focus of the industry; LED chips account for about 50% of the cost of LED displays, and reducing the LED component area by 25 times can reduce the LED cost by about 20 times; assembly costs account for about 25% of the LED display cost, and increasing the assembly speed by 40 times can reduce the assembly cost by about 40 times; therefore, reducing the LED size and increasing the LED assembly speed are effective ways to effectively reduce the cost of display screens. By reducing the chip area and increasing the assembly speed, the display manufacturing cost can be reduced by 70%.

[0004] As a parallel manufacturing technology, self-assembly technology has proposed research on the principles of fluid force, surface energy, magnetism, gravity, electrostatic force, etc. The self-assembly technology applied to Micro LED mass transfer refers to the directed self-assembly technology. The steps adopted are: placing a large number of micro components in the system, relying on a certain force to make the chip move quickly at a certain speed, and completing the alignment assembly method with the corresponding assembly position of the substrate by itself.

[0005] Currently, the two most representative self-assembly technologies in the industry are magnetic self-assembly and fluid self-assembly technology.

[0006] Fluid assembly technology has the advantages of low machine cost, low process cost, low material cost, etc., and the random process has no light spot or color spot problems.

[0007] Fluid assembly technology mainly allows the substrate structure to capture Micro LED chips at a precise position, while creating multiple capture opportunities through reciprocating flow. It uses a self-assembly process, does not require external precise alignment, and is independent of the number of pixels. The LED spacing is also not limited by the accuracy of the assembly machine, so the cost is very low; the harvested μLEDs are randomly mixed in the liquid, and defective chips can be detected by micro-PL during the chip process and excluded in the harvesting process, allowing nearly 100% of the chips to be effectively utilized.

[0008] DNA is a macromolecular polymer composed of deoxynucleotides, which are composed of bases, deoxyribose and phosphate. There are four types of bases: adenine (A), guanine (G), thymine (T) and cytosine (C), as well as new base pairs subsequently synthesized artificially. The assembly of DNA is based on a simple rule, namely, base pair complementarity. Driven by the hydrogen bonds of paired bases, complementary DNA chains will spontaneously form a double helix. In essence, the two chains of DNA are usually completely complementary. However, if the DNA chains are only partially complementary, then both chains can be complementary to multiple chains.

[0009] DNA assembly refers to the process of using the affinity and base pairing rules of DNA molecules to self-assemble multiple DNA fragments into specific three-dimensional structures or nanostructures according to the designed sequence and structure; DNA assembly has important application value in nanotechnology, biomedicine, materials science and other fields; the molecular-level positioning capability of DNA nanostructures also makes high-precision assembly of MicroLEDs possible.

[0010] Principles of DNA assembly:

[0011] 1. Base pairing rules: The base pairing rules of DNA molecules determine the affinity between the two DNA chains, and stable base pairing is formed between A and T, and C and G.

[0012] 2. Affinity: The base pairing rules of DNA molecules enable DNA fragments with affinity to attract each other and form a stable double-stranded structure.

[0013] 3. Self-assembly: By utilizing the affinity and base pairing rules between DNA fragments, appropriate sequences and structures can be designed to allow DNA fragments to self-assemble into specific structures.

[0014] DNA annealing is an important biological process that can also be used in engineering and materials science. In biology, DNA annealing refers to the unwinding of double-stranded DNA molecules into two single strands under certain high temperature conditions. This unwinding process is called annealing. After cooling, the double-stranded DNA molecules will recombine, and this process is reversible.

[0015] Based on the principle of DNA assembly, a Micro LED self-assembly method based on DNA base complementary pairing was proposed. Summary of the invention

[0016] The purpose of the present invention is to provide a Micro LED self-assembly method based on DNA base complementary pairing, to achieve a simple and efficient self-assembly process, to complete the high-precision transfer and low-cost production of Micro LED chips, and to have broad market application prospects.

[0017] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0018] A Micro LED self-assembly method based on DNA base complementary pairing includes the following steps:

[0019] S1: Introducing DNA single-stranded molecular base pairs on the light-emitting surface of the Micro LED chip using chemical reactions;

[0020] S2: Treat the surface of a specific position of the target substrate so that a single-stranded DNA base pair complementary to the surface of the Micro LED chip is introduced through a chemical reaction;

[0021] S3: Immerse the Micro LED chip and substrate in a fluid containing active ingredients that protect the DNA chain;

[0022] S4: The Micro LED chips are evenly distributed to various positions of the substrate through the application of force, and the automatic arrangement and assembly of the Micro LED chips are achieved by utilizing the base complementary pairing between the single-stranded DNA molecules on the surface of the Micro LED chips and the single-stranded DNA molecules on the surface of the substrate;

[0023] S5: Use fluid to remove excess Micro LED chips on the surface of the substrate and clean it, and then perform subsequent flattening and rewiring processing.

[0024] In a preferred solution, in step S2, the surface of a specific position of the target substrate is processed by photolithography or spray printing.

[0025] In a preferred solution, in step S4, the Micro LED chips are evenly distributed to various positions of the substrate through fluid flow or magnetic force or capillary force.

[0026] In a preferred solution, during the assembly process of step S4, a program is used to perform thermal annealing by heating and cooling, so that the DNA single-stranded molecules on the surface of the Micro LED chip and the complementary DNA single-stranded molecules on the substrate can further self-correct and achieve high-precision alignment.

[0027] A preferred solution is to realize automatic arrangement and assembly of RGB three colors of Micro LED chips in step S4.

[0028] In a preferred solution, when the RGB three colors of the Micro LED chip are automatically arranged and assembled, different DNA single-stranded molecules are used to treat the light-emitting surfaces of the Micro LED chips corresponding to the three colors RGB, and specific positions of the substrate are also treated with RGB complementary DNA single-stranded molecules.

[0029] Due to the application of the above technical solution, the beneficial effects of the present application compared with the prior art are:

[0030] The present application provides a Micro LED self-assembly method based on complementary DNA base pairing, which introduces mutually paired DNA single-stranded molecular base pairs on the light-emitting surface of the MicroLED chip and the surface of a specific position of the substrate, and realizes a simple and efficient self-assembly process by using the two effects of fluid force and DNA molecular chain, thereby completing the high-precision transfer and low-cost production of Micro LED chips, and has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 Schematic diagram of the process of the Micro LED self-assembly method based on DNA base complementary pairing of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0036] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] Embodiment 1

[0040] See also Figure 1 The present application provides a Micro LED self-assembly method based on DNA base complementary pairing, comprising the following steps:

[0041] S1: Introducing DNA single-stranded molecular base pairs on the light-emitting surface of the Micro LED chip using chemical reactions;

[0042] S2: Treat the surface of a specific position of the target substrate so that a single-stranded DNA base pair complementary to the surface of the Micro LED chip is introduced through a chemical reaction;

[0043] S3: Immerse the Micro LED chip and substrate in a fluid containing active ingredients that protect the DNA chain;

[0044] S4: The Micro LED chips are evenly distributed to various positions of the substrate through the application of force, and the automatic arrangement and assembly of the Micro LED chips are achieved by utilizing the base complementary pairing between the single-stranded DNA molecules on the surface of the Micro LED chips and the single-stranded DNA molecules on the surface of the substrate;

[0045] S5: Use fluid to remove excess Micro LED chips on the surface of the substrate and clean it, and then perform subsequent flattening and rewiring processing.

[0046] Embodiment 2

[0047] A Micro LED self-assembly method based on DNA base complementary pairing includes the following steps:

[0048] S1: Introducing DNA single-stranded molecular base pairs on the light-emitting surface of the Micro LED chip using chemical reactions;

[0049] S2: The surface of a specific position of the target substrate is processed by photolithography or spray printing, so that a single-stranded DNA molecule base pair complementary to the surface of the Micro LED chip is introduced through a chemical reaction;

[0050] S3: Immerse the Micro LED chip and substrate in a fluid containing active ingredients that protect the DNA chain;

[0051] S4: The Micro LED chips are evenly distributed to various positions of the substrate through fluid flow or magnetic or capillary force, and the base complementary pairing between the single-stranded DNA molecules on the surface of the corresponding Micro LED chips and the single-stranded DNA molecules on the surface of the substrate is used to achieve automatic arrangement and assembly of the Micro LED chips;

[0052] S5: Use fluid to remove excess Micro LED chips on the surface of the substrate and clean it, and then perform subsequent flattening and rewiring processing.

[0053] Embodiment 3

[0054] A Micro LED self-assembly method based on DNA base complementary pairing includes the following steps:

[0055] S1: Introducing DNA single-stranded molecular base pairs on the light-emitting surface of the Micro LED chip using chemical reactions;

[0056] S2: The surface of a specific position of the target substrate is processed by photolithography or spray printing, so that a single-stranded DNA molecule base pair complementary to the surface of the Micro LED chip is introduced through a chemical reaction;

[0057] S3: Immerse the Micro LED chip and substrate in a fluid containing active ingredients that protect the DNA chain;

[0058] S4: The Micro LED chips are evenly distributed to various positions of the substrate through fluid flow or magnetic or capillary force. The base complementary pairing of the DNA single-stranded molecules on the surface of the corresponding Micro LED chips and the surface of the substrate is used to realize the automatic arrangement and assembly of the RGB three colors of the Micro LED chips. Different DNA single-stranded molecules are used to process the light-emitting surfaces of the Micro LED chips corresponding to the three colors RGB, and the specific positions of the substrate are also processed with RGB complementary DNA single-stranded molecules;

[0059] During the assembly process, the program is used to perform thermal annealing by increasing and decreasing the temperature, so that the single-stranded DNA molecules on the surface of the Micro LED chip and the complementary single-stranded DNA molecules on the substrate can further self-correct and achieve high-precision alignment;

[0060] S5: Use fluid to remove excess Micro LED chips on the surface of the substrate and clean it, and then perform subsequent flattening and rewiring processing.

[0061] The Micro LED self-assembly method based on DNA base complementary pairing provided in the present application can also be applied to the assembly of Nano LEDs.

[0062] The present application provides a Micro LED self-assembly method based on complementary DNA base pairing, which introduces mutually paired DNA single-stranded molecular base pairs on the light-emitting surface of the MicroLED chip and the surface of a specific position of the substrate, and realizes a simple and efficient self-assembly process by using the two effects of fluid force and DNA molecular chain, thereby completing the high-precision transfer and low-cost production of Micro LED chips, and has broad market application prospects.

[0063] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A Micro LED self-assembly method based on DNA base complementary pairing, characterized in that: The steps include: S1: Introducing DNA single-stranded molecular base pairs on the light-emitting surface of the Micro LED chip using chemical reactions; S2: Treat the surface of a specific position of the target substrate so that a single-stranded DNA base pair complementary to the surface of the Micro LED chip is introduced through a chemical reaction; S3: Immerse the Micro LED chip and substrate in a fluid containing active ingredients that protect the DNA chain; S4: The Micro LED chips are evenly distributed to various positions of the substrate through the application of force, and the automatic arrangement and assembly of the Micro LED chips are achieved by utilizing the base complementary pairing between the single-stranded DNA molecules on the surface of the Micro LED chips and the single-stranded DNA molecules on the surface of the substrate; S5: Use fluid to remove excess Micro LED chips on the surface of the substrate and clean it, and then perform subsequent flattening and rewiring processes.

2. The Micro LED self-assembly method based on DNA base complementary pairing according to claim 1, characterized in that: In step S2, the surface of a specific position of the target substrate is processed by photolithography or spray printing.

3. The Micro LED self-assembly method based on DNA base complementary pairing according to claim 1, characterized in that: In step S4, the Micro LED chips are evenly distributed to various positions on the substrate through fluid flow or magnetic force or capillary force.

4. The Micro LED self-assembly method based on DNA base complementary pairing according to claim 1, characterized in that: During the assembly process of step S4, a program is used to perform thermal annealing by increasing and decreasing the temperature, so that the single-stranded DNA molecules on the surface of the Micro LED chip and the complementary single-stranded DNA molecules on the substrate can further self-correct and achieve high-precision alignment.

5. The Micro LED self-assembly method based on DNA base complementary pairing according to claim 1, characterized in that: In step S4, the RGB three-color automatic arrangement and assembly of the Micro LED chip is achieved.

6. The Micro LED self-assembly method based on DNA base complementary pairing according to claim 5, characterized in that: When automatically arranging and assembling the RGB colors of the Micro LED chip, different single-stranded DNA molecules are used to treat the light-emitting surfaces of the Micro LED chips corresponding to the three colors RGB, and specific positions of the substrate are also treated with single-stranded DNA molecules complementary to RGB.

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