KR102236357B1 - Method of manufacturing micro lens array having color change function - Google Patents

Abstract

The present invention relates to a method of manufacturing a micro lens array having a color change function and provided in a micro LED display module. According to an embodiment of the present invention, the method of manufacturing a micro lens array, which includes: lens units provided in a micro LED display module using a plurality of micro LEDs themselves as light emitting materials, and protruding from one surface to one-to-one correspond to the micro LEDs, respectively; bank units recessed inward to one-to-one correspond to the lens units on the opposite surface, respectively; a partition wall unit formed between the bank units; and a color conversion unit provided in the bank units to convert a color of light emitted from the micro LEDs, includes: a mold preparation step of preparing a first mold having one surface formed with an intaglio shape of the lens unit and a second mold one surface formed with an embossed shape of the lens unit; a mold alignment step of aligning the first mold and the second mold on a base mold while the intaglio shape of the lens unit and the embossed shape of the bank unit are spaced apart by a predetermined distance to correspond to one-to-one; a polymer injection and curing step of injecting and curing a transparent polymer into a space between the first mold and the second mold; and a color conversion unit forming step of forming the color conversion unit in the bank unit. Thus, since there is no need to separately manufacture the color conversion film, time and cost are saved.

Description

Method of manufacturing micro lens array having color change function {Method of manufacturing micro lens array having color change function}

The present invention relates to a method of manufacturing a micro lens array having a color conversion function provided in a micro LED display module.

Micro LED is a micro LED with a size of less than 100㎛ (chip size is about 5 ~ 100㎛). It is suitable for realization, is far superior to existing displays in terms of color reproducibility, power consumption, and response speed, and has the advantage of making the display larger and transparent.

Accordingly, a micro LED display using the same has recently attracted attention as a next-generation display.

While the core materials of LCD and OLED are liquid crystal and organic materials, respectively, micro LED display refers to a display that uses a micro LED chip itself of approximately 5 to 100 μm in size as a light emitting material.

Micro LED displays have advantages in terms of brightness and contrast ratio, energy efficiency and response time compared to conventional displays, and in particular, VR/AR devices can be made light and clear, as well as large-sized, attracting attention in the TV and sign lighting markets, etc. There are many potential applications.

In such a micro LED display, one pixel must be composed of three red, green, and blue LED chips, and accordingly, each of the red, green, and blue LED chips must be sequentially assembled at a predetermined position on the substrate. However, in order to implement micro LED displays in high resolution, a large number of micro LEDs-for example, about 6.22 million units (based on R, G, B chips)-to implement FHD-class (1,920X1,080) resolution. It is necessary, and it takes a considerable amount of time to assemble each of them in a predetermined position.

In order to solve this problem, a method of converting the color of light emitted from the LED chip by using a phosphor after assembling a monochromatic micro LED on a substrate may be considered. In this case, a color conversion element must be additionally applied to each of the micro LEDs.

1 is a diagram schematically showing a conventional micro LED display module.

Referring to FIG. 1, a conventional micro LED display module 1 includes a substrate 3 on which a plurality of micro LEDs 2 are provided, a color conversion film 4 provided on the substrate 3, and a color conversion film 4 ) It includes a micro lens array 5 provided on the top.

The micro LED 2 uses a white or blue monochromatic micro LED to shorten the assembly process time, and the color conversion film 4 includes a color conversion unit that converts the color of light emitted from the micro LED 2 ( 6) is provided to correspond to each of the micro LEDs 2 on a one-to-one basis, and the micro lens array 5 includes a lens unit 7 for increasing light efficiency by adjusting the divergence angle of light emitted from the micro LED 2. It is provided to correspond to each of the micro LEDs (2) one-to-one.

However, in the conventional micro LED display module 1 having the above configuration, each of the color conversion film 4 and the micro lens array 5 is manufactured, and then attached and bonded using an optical transparent adhesive film (OCA) (8). There is a problem to be made.

That is, in order to manufacture the conventional micro LED display module 1, first, the color conversion film 4 is attached and bonded to the upper part of the substrate 3 using the OCA 8, and then the color conversion film 4 is used again. The micro lens array 5 must be attached and bonded on the upper part of the conversion film 4, and at this time, the micro LED 2, the color conversion unit 6, and the lens unit 7 must be accurately bonded in a state in which they are aligned to correspond exactly one-to-one. However, since the micro-display module 1 has a size of at least several tens of microns, it is technically very difficult to perform high-precision bonding over two times, and there is a problem in that there is a large possibility of delamination due to thermal deformation when driving the display.

The present invention is to solve the above problems, and provides a method of manufacturing a micro lens array having a color conversion function.

A method of manufacturing a micro lens array according to an embodiment of the present invention is provided in a micro LED display module using a plurality of micro LEDs themselves as a light emitting material, and a lens protruding on one surface to correspond to each of the plurality of micro LEDs one-to-one And a bank portion recessed inward to correspond to each of the plurality of lens portions on an opposite surface, a partition wall portion formed between the plurality of bank portions, and the plurality of micro LEDs provided in the bank portion, respectively In the manufacturing method of a microlens array comprising a color conversion unit for converting the color of light emitted from, a first mold in which the intaglio shape of the lens part is formed on one surface, and a second mold in which the embossed shape of the bank part is formed on one surface. Preparing the mold preparation step; A mold alignment step of aligning the first mold and the second mold with the base mold at predetermined intervals so that the intaglio shape of the lens part and the relief shape of the bank part correspond one-to-one to each other; A polymer injection and curing step of injecting and curing a transparent polymer into the space between the first mold and the second mold; And forming a color conversion unit forming the color conversion unit in the bank unit.

In addition, in the method of manufacturing a microlens array according to an embodiment of the present invention, in the forming of the color conversion unit, the color conversion unit is formed by injecting and curing quantum dot (QD) ink in the bank. do.

In addition, in the method of manufacturing a micro lens array according to an embodiment of the present invention, the plurality of micro LEDs are blue LEDs that emit blue light, and the forming of the color conversion unit includes light emitted from the blue LEDs. A step of forming a green conversion unit for curing by injecting and curing quantum dot (QD) ink that converts to green light, and a red conversion for curing by injecting quantum dot (QD) ink that converts blue light emitted from the blue LED into red light. It may include a sub-forming step.

In addition, the method of manufacturing a microlens array according to an embodiment of the present invention may further include forming a first light absorbing layer in which a first light absorbing layer is formed on a bottom surface of the partition wall.

In addition, the method of manufacturing a microlens array according to an embodiment of the present invention further comprises a step of forming a light reflective layer to form a light reflective layer on a side of the bank part before the step of forming the color conversion unit. I can.

In addition, the method of manufacturing a microlens array according to an embodiment of the present invention may further include forming a second light absorbing layer of forming a second light absorbing layer between the lens units.

In addition, in the method of manufacturing a microlens array according to an embodiment of the present invention, the microlens array includes an air layer formed on an edge of a bottom surface of the bank portion, and the second mold includes an edge of the embossed shape of the bank portion. A protrusion for forming the air layer may be formed.

In addition, a method of manufacturing a microlens array according to an embodiment of the present invention is characterized in that the upper surface of the embossed bank portion of the second mold has a convex shape corresponding to the shape of the lens portion.

According to the micro lens array and the micro LED display module according to an embodiment of the present invention having the above configuration, since the micro lens array has a color conversion function, in order to shorten the assembly process time of the micro LED display module, In the case of using a micro LED, it is not necessary to manufacture and attach a separate color conversion film. Therefore, unlike the case of separately manufacturing and attaching a color conversion film, it can be manufactured with only one high-precision bonding. Due to this, the possibility of peeling is also significantly reduced, and further, cost can be saved in that there is no need to separately manufacture a color conversion film, and light loss that occurs when light from the micro LED passes through the color conversion film is reduced. As it can be removed, there is an effect of increasing the optical efficiency.

The effects according to the present invention are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by those of ordinary skill in the art from the description of the claims and detailed description. I will be able to.

1 is a diagram schematically showing a conventional micro LED display module,
2 is a diagram schematically showing a micro lens array according to an embodiment of the present invention,
3 is a diagram schematically showing a micro LED display module to which the micro lens array according to FIG. 2 is coupled,
4 is a diagram schematically showing a state in which color mixing occurs in a micro LED display module according to an embodiment of the present invention;
5 is a diagram schematically showing a micro lens array according to another embodiment of the present invention,
6 is a diagram schematically showing a micro lens array according to another embodiment of the present invention,
7 is a diagram schematically showing a micro lens array according to another embodiment of the present invention,
8 is a schematic flowchart showing a method of manufacturing a micro lens array according to an embodiment of the present invention,
9 is a diagram schematically showing a state of a polymer injection and curing step according to an embodiment of the present invention,
10 is a diagram schematically showing a state of a polymer injection and curing step according to another embodiment of the present invention,
11 is a diagram schematically illustrating a state of injecting and curing a polymer according to another embodiment of the present invention.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same components are assigned the same reference numerals, and redundant descriptions thereof are omitted.

Terms such as first and second may be used to describe a component, but the components are not limited to the terms and are used only for the purpose of distinguishing one component from another component.

When a part "includes" a certain component, this means that other components may be further provided, rather than excluding other components, unless specifically stated to the contrary.

In the drawings, the thickness or size of each layer (film), region, pattern, or structure may be modified for clarity and convenience of description, and thus the actual size is not entirely reflected. In the description of the embodiments, each layer (film), region, pattern, or structure is “over”, “on” or “below” of the substrate, each layer (film), region, pad, or patterns. In the case of being described as being formed in "under", "over", "on" and "under" means "directly" or "indirectly through another layer. )" includes everything that is formed.

In addition, "on" means that it is located above or below the target member, and does not necessarily mean that it is located above the gravitational direction.

In this specification, relative terms such as'upper','lower','top','bottom','upper','lower' may be used to describe the relationship between components based on the directions shown in the drawings. , The present invention is not limited by such terms.

Each embodiment may be implemented independently or together, and some components may be excluded in accordance with the purpose of the invention.

FIG. 2 is a diagram schematically illustrating a micro lens array according to an embodiment of the present invention, and FIG. 3 is a diagram schematically illustrating a micro LED display module to which the micro lens array according to FIG. 2 is coupled.

2 and 3, a micro LED display module 100 according to an embodiment of the present invention includes a plurality of micro LEDs 104 and a micro lens array (MLA) having a color conversion function. 10) may be included.

The micro LED 104 is a micro LED having a size of approximately 5 to 100 μm, and the plurality of micro LEDs 104 may be provided on the circuit board 107 and provide various image information. It can be controlled so that it can be displayed.

The micro lens array 10 includes a body 10a, a lens unit 11 protruding to correspond to each of a plurality of micro LEDs 104 on one surface (top surface in the drawing), and the body 10a ) A bank portion 12 recessed inward to correspond to each of the plurality of lens portions 11 on the opposite surface (bottom surface in the drawing), and a partition wall portion 13 formed between the plurality of bank portions 12 , It may include a color conversion unit 20 provided in the bank unit 12 for converting the color of the light emitted from each of the plurality of micro LEDs (104).

The lens unit 11 is for increasing the light efficiency by adjusting the divergence angle of light emitted from each of the plurality of micro LEDs 104 to extract the total internally reflected light to the upper surface, and is protruding on one surface of the body 10a. It may be formed in the shape of a convex lens.

The color conversion unit 20 is for implementing RGB by changing the wavelength of light emitted from each of the micro LEDs 104, and may be formed by injecting and curing quantum dot (QD) ink into the bank unit 12. .

The quantum dot is a semiconductor material having a crystal structure of several nanometers, and refers to a collection of specific molecules that convert energy of a light wavelength into energy of a specific other light wavelength. In general, the quantum dot has a characteristic of emitting light of a shorter wavelength as the size of the quantum dot is smaller, and emitting light of a longer wavelength as the size of the quantum dot is larger.

Therefore, using the characteristics of the quantum dots, even when the plurality of micro LEDs 104 are used with white or blue monochromatic micro LEDs in order to shorten the assembly process time of the micro LED display module 100, conventional micro LEDs As in the LED display module 1, a color image can be displayed by implementing RGB without the need to manufacture and attach a separate color conversion film 4 to be combined.

For example, the plurality of micro LEDs 104 are blue LEDs that emit blue light, and the color conversion unit 20 is cured by injection of quantum dot ink that converts blue light emitted from the blue LED into green light. A green conversion unit 23, a red conversion unit 25 cured by injection of quantum dot ink that converts blue light emitted from the blue LED into red light, and a space unit 27 for emitting blue light emitted from the blue LED as it is (That is, the space part 27 may include a bank part 12 to which the quantum dot ink is not injected).

As shown in FIG. 3, the micro lens array 10 may be attached and coupled to the upper portion of the plurality of micro LEDs 104 using an optical clear adhesive (OCA) 14.

That is, the present invention includes a micro lens array 10 having a color conversion function and the micro lens array 10 provided in a micro LED display module using the micro LED itself having a size of approximately 5 to 100 μm as a light emitting material. It relates to a micro LED display module 100, wherein the micro lens array 10 has a color conversion function by itself by having a color conversion unit 20, so the assembly process time of the micro LED display module 100 Even when a single color micro LED is used for the plurality of micro LEDs 104 in order to shorten the RGB color conversion film 4 as in the conventional micro LED display module 1, there is no need to separately manufacture and attach the color conversion film 4 to RGB. It is possible to display a color image by implementing.

Therefore, according to the micro lens array 10 and the micro LED display module 100 according to an embodiment of the present invention, unlike the conventional micro LED display module 1 in which the color conversion film 4 is separately manufactured and attached and coupled. , It is possible to manufacture with only one high-precision bonding using an optical transparent adhesive film (OCA, Optical Clear Adhesive) 14, and accordingly, compared to the conventional micro LED display module 1, the display is peeled off due to thermal deformation when driving the display. It is possible to significantly reduce the possibility of occurrence of the phenomenon, and since there is no need to separately manufacture a color conversion film, manufacturing costs can be reduced, and light emitted from the micro LED 104 can be transferred to a conventional color conversion film 4 As it becomes possible to remove the light loss that occurs when transmitting the light, the optical efficiency can be increased.

Meanwhile, the micro lens array 10 may further include a first light absorbing layer 15 formed on the bottom surface of the partition wall portion 13.

The first light absorbing layer 15 absorbs light coming out of the plurality of micro LEDs 104 and incident on the partition wall 13 to prevent color mixing by the light incident on the partition wall 13 to achieve a high level. It is to implement the color reproduction rate of, and may be formed by a method such as blackening treatment.

In addition, the micro lens array 10 may further include a light reflective layer 16 formed on the side of the bank 12.

The light reflective layer 16 prevents light emitted from the plurality of micro LEDs 104 from being emitted to the side of the bank part 12 when passing through the color conversion part 20 to improve overall light efficiency. As such, it may be formed by mirror coating, silver (Ag) evaporation, or the like.

4 is a diagram schematically illustrating a state in which color mixing occurs in a micro LED display module according to an embodiment of the present invention.

As shown in FIG. 4, in the micro LED display module 100 according to an embodiment of the present invention, light passing through the color conversion unit 20 from the plurality of micro LEDs 104 is a lens unit 11 ), and light L1 that is incident and emitted between the lens units 11 and L2 that is totally or Fresnel reflected between the lens units 11 and is emitted to another lens unit 11 adjacent to each other. , L2) Color mixing occurs.

Accordingly, the micro LED display module 100 according to an embodiment of the present invention needs to prevent color mixing by the lights L1 and L2 for high color reproduction.

Hereinafter, various embodiments of the microlens array 10 for preventing color mixing due to the lights L1 and L2 will be described with reference to the drawings.

5 is a diagram schematically showing a micro lens array according to another embodiment of the present invention.

Referring to FIG. 5, the micro lens array 10 according to the present embodiment may further include a second light absorbing layer 17 formed between the lens units 11.

Then, the light coming out of the plurality of micro LEDs 104 and passing through the color conversion unit 20 and incident between the lens units 11 is absorbed by the second light absorbing layer 17, so that the lights L1 and L2 are absorbed. Color mixing by) can be prevented.

The second light absorbing layer 17 may be formed by a method such as blackening.

6 is a diagram schematically illustrating a micro lens array according to another embodiment of the present invention.

Referring to FIG. 6, the microlens array 10 according to the present embodiment may further include an air layer 18 formed on the bottom edge of the bank portion 12.

Then, the light coming out of the plurality of micro-LEDs 104 and passing through the color conversion unit 20 and incident between the lens units 11 is totally reflected by the A layer 18 and one-to-one to the color conversion unit 20. Since the light is incident on and emitted from the correspondingly formed lens unit 11, color mixing due to the lights L1 and L2 can be prevented.

7 is a diagram schematically illustrating a micro lens array according to another embodiment of the present invention.

Referring to FIG. 7, the bank portion 12 and the bottom surface 19 of the microlens array 10 according to the present embodiment may have a convex shape corresponding to the shape of the lens portion 11.

Then, most of the light coming out of the plurality of micro LEDs 104 and passing through the color conversion unit 20 enters and exits the lens unit 11 formed in a one-to-one correspondence with the color conversion unit 20, Color mixing by the lights L1 and L2 may be prevented.

Hereinafter, a method of manufacturing the micro lens array 10 having the above-described configuration will be described in detail.

FIG. 8 is a schematic flowchart showing a method of manufacturing a micro lens array according to an embodiment of the present invention, and FIG. 9 is a diagram schematically showing a state of a polymer injection and curing step according to an embodiment of the present invention.

8 and 9, a method (S10) of manufacturing a microlens array according to an embodiment of the present invention includes a mold preparation step (S11), a mold alignment step (S12), a polymer injection and curing step (S13). , It may include a step of forming a color conversion unit (S14).

The mold preparation step (S11) includes a first mold 32 in which an intaglio shape 33 of the lens part 11 is formed on one surface, and a second mold in which the relief shape 35 of the bank part 12 is formed on one surface. This is the step of preparing the mold 34.

The mold alignment step (S12) is a one-to-one correspondence between the first mold 32 and the second mold 34 and the concave shape 33 of the lens part 11 and the embossed shape 35 of the bank part 12. It is a step of aligning with the base mold 30 in a state spaced apart by a predetermined interval as possible.

In the polymer injection and curing step (S13), a transparent polymer (ex. silicone) is injected into the space 37 between the first mold 32 and the second mold 34 to be cured, and the lens unit 11 is cured. ) And the body (10a) in which the bank portion 12 is formed.

To this end, an injection hole 31 for injecting a transparent polymer may be formed in the base mold 30.

The polymer injection and curing step (S13) may be performed by UV curing or thermal curing, and the present invention is not limited thereto.

However, when the polymer injection and curing step (S13) is performed by UV curing, at least one of the first mold 32 and the second mold 34 is made of transparent glass, and UV is made of the transparent glass. It can be investigated with a mold.

For example, as shown in FIG. 9, the first mold 32 may be made of transparent glass, and in this case, UV may be irradiated to the first mold 32.

The color conversion unit forming step (S14) is a step of forming the color conversion unit 20 in the bank unit 12, and can be performed by injecting and curing quantum dot (QD) ink into the bank unit 12. have.

At this time, when the plurality of micro LEDs 104 use a blue LED that emits blue light, the step of forming the color conversion unit (S14) includes quantum dot ink for converting the light emitted from the blue LED into green light. It may include a step of forming a green conversion unit for curing by injection, and a step of forming a red conversion unit for curing by injecting quantum dot ink that converts blue light emitted from the blue LED into red light.

In addition, the microlens array manufacturing method (S10) according to an embodiment of the present invention further includes a first light absorbing layer forming step (S15) of forming the first light absorbing layer 15 on the bottom surface of the partition wall portion 13. I can.

In the step of forming the first light absorbing layer (S15), the first light absorbing layer 15 may be formed by blackening the bottom surface of the partition wall part 13, and the bank part 12 is covered with a predetermined mask. Can be done in the state.

In FIG. 8, the first light absorbing layer forming step (S15) is shown to be performed before the color conversion unit forming step (S14), but may be performed after the color conversion unit forming step (S14). Not limited.

In addition, the microlens array manufacturing method (S10) according to an embodiment of the present invention is a light reflective layer forming step of forming a light reflective layer 16 on the side of the bank part 12 before the color conversion part forming step (S14). It may further include (S16).

The light reflective layer forming step (S16) may be performed by mirror coating, silver (Ag) evaporation, or the like, and may be performed while the bottom surface of the bank portion 12 is covered with a predetermined mask.

In FIG. 8, the step of forming the light reflecting layer (S16) is shown to be performed after the step of forming the first light absorbing layer (S15), but the step of forming the light reflecting layer (S16) is before the step of forming the first light absorbing layer (S15). It may be done, and the present invention is not limited thereto.

In addition, the method S10 of manufacturing a microlens array according to an embodiment of the present invention may further include forming a second light absorbing layer of forming a second light absorbing layer 17 between the lens units 11.

The step of forming the second light absorbing layer may be performed while the lens unit 11 is covered with a predetermined mask, and may be performed before, after, or at the same time as the step of forming the first light absorbing layer (S15), and the light reflecting layer It may be performed before or after the forming step (S15), or may be performed before or after the forming step (S14) of the color conversion unit, and the present invention is not limited thereto.

10 is a diagram schematically showing a state of a polymer injection and curing step according to another embodiment of the present invention.

Referring to FIG. 10, the microlens array 10 may include an air layer 18 formed on the bottom edge of the bank part 12, and for this purpose, the bank part ( A protrusion 38 for forming the air layer 18 may be formed at the edge of the embossed shape 35 of 12).

11 is a diagram schematically illustrating a state of injecting and curing a polymer according to another embodiment of the present invention.

Referring to FIG. 11, the bottom surface of the bank portion 12 may have a convex shape corresponding to the shape of the lens portion 11, and for this purpose, the bank portion 12 of the second mold 34 is embossed. The upper surface 39 of 35 may have a convex shape corresponding to the shape of the lens unit 11.

As described above, the present invention provides a micro LED display module including a micro lens array having a color conversion function provided in the micro LED display module, a micro lens array having the color conversion function, and a micro LED display module having the color conversion function. It relates to a method of manufacturing a micro lens array, and its embodiment may be changed in various forms. Therefore, the present invention is not limited by the embodiments disclosed in the present specification, and all forms that can be changed by a person of ordinary skill in the art to which the present invention pertains will also fall within the scope of the present invention.

10: micro lens array 11: lens unit
12: bank part 13: bulkhead part
14: Optical Clear Adhesive (OCA)
15: first light absorption layer 16: light reflection layer
17: second light absorbing layer 18: air layer
19: bottom of the bank part 20: color conversion part
23: green conversion unit 25: red conversion unit
27: space part
100: micro LED display module
104: micro LED 107: circuit board

Claims (8)

Attached and bonded to a micro LED display module using a plurality of micro LEDs themselves as a light emitting material by an optical clear adhesive (OCA), and a one-to-one correspondence to each of the plurality of micro LEDs on a body and one surface of the body A lens portion protruding so as to be formed; a bank portion recessed inwardly to correspond to each of the plurality of lens portions on an opposite surface of the body; a partition wall portion formed between the bank portions; In the method of manufacturing a micro lens array comprising a color conversion unit for converting the color of light emitted from each of a plurality of micro LEDs,
A mold preparation step of preparing a first mold in which the concave shape of the lens part is formed on one surface and a second mold in which the concave shape of the bank part is formed on one surface;
A mold alignment step of aligning the first mold and the second mold with the base mold at a predetermined interval so that the intaglio shape of the lens part and the relief shape of the bank part correspond one-to-one to each other;
A polymer injection and curing step of injecting and curing a transparent polymer into the space between the first mold and the second mold to form a body in which the lens portion and the bank portion are formed; And
And a color conversion unit forming step of forming the color conversion unit in a bank portion formed on the body. delete Attached and bonded to a micro LED display module using a plurality of micro LEDs themselves as a light emitting material by an optical clear adhesive (OCA), and a one-to-one correspondence to each of the plurality of micro LEDs on a body and one surface of the body A lens portion protruding so as to be formed; a bank portion recessed inwardly to correspond to each of the plurality of lens portions on an opposite surface of the body; a partition wall portion formed between the bank portions; In the method of manufacturing a micro lens array comprising a color conversion unit for converting the color of light emitted from each of a plurality of micro LEDs,
A mold preparation step of preparing a first mold in which the concave shape of the lens part is formed on one surface and a second mold in which the concave shape of the bank part is formed on one surface;
A mold alignment step of aligning the first mold and the second mold with the base mold at a predetermined interval so that the intaglio shape of the lens part and the relief shape of the bank part correspond one-to-one to each other;
A polymer injection and curing step of injecting and curing a transparent polymer into the space between the first mold and the second mold to form a body in which the lens portion and the bank portion are formed; And
Including; a color conversion unit forming step of forming the color conversion unit in the bank unit,
The plurality of micro LEDs are blue LEDs emitting blue light,
The color conversion unit includes a green conversion unit that converts light emitted from the blue LED into green light, a red conversion unit that converts blue light emitted from the blue LED into red light, and a space unit that directly emits blue light emitted from the blue LED. ,
In the forming of the color conversion unit, the green conversion unit is formed by injecting and curing quantum dot (QD) ink that converts the light emitted from the blue LED into green light in a part of the bank unit, and the green conversion unit is formed in a part of the bank unit. A method of manufacturing a microlens array comprising injecting and curing quantum dot (QD) ink that converts blue light emitted from the blue LED into red light to form the red conversion unit. The method of claim 1,
In the forming of the color conversion unit, the color conversion unit is formed by injecting and curing quantum dot (QD) ink in the bank unit,
The method of manufacturing a microlens array further comprises forming a first light absorbing layer on a bottom surface of the partition wall portion. It is provided in a micro LED display module that uses a plurality of micro LEDs themselves as a light emitting material, and has a lens unit protruding to correspond to each of the plurality of micro LEDs on one side and a one to one correspondence to each of the plurality of lens units on the opposite side. Microlens array including a bank portion recessed inward so as to be formed, a partition wall portion formed between the plurality of bank portions, and a color conversion portion provided in the bank portion to convert the color of light emitted from each of the plurality of micro LEDs In the manufacturing method of,
A mold preparation step of preparing a first mold in which the concave shape of the lens part is formed on one surface and a second mold in which the concave shape of the bank part is formed on one surface;
A mold alignment step of aligning the first mold and the second mold with the base mold at a predetermined interval so that the intaglio shape of the lens part and the relief shape of the bank part correspond one-to-one to each other;
A polymer injection and curing step of injecting and curing a transparent polymer into the space between the first mold and the second mold; And
Including; a color conversion unit forming step of forming the color conversion unit in the bank unit,
In the forming of the color conversion unit, the color conversion unit is formed by injecting and curing quantum dot (QD) ink in the bank,
The method of manufacturing the micro lens array,
Forming a first light absorbing layer on a lower surface of the partition wall portion,
And forming a light reflective layer on a side surface of the bank part prior to the color conversion part forming step. The method of claim 5,
The method of manufacturing a microlens array further comprises forming a second light absorbing layer of forming a second light absorbing layer between the lens units. The method of claim 5,
The micro lens array includes an air layer formed on an edge of a bottom surface of the bank portion,
A method of manufacturing a microlens array, wherein a protrusion for forming the air layer is formed on the edge of the embossed shape of the bank part on the second mold. The method of claim 5,
The method of manufacturing a microlens array, wherein the upper surface of the embossed bank portion of the second mold has a convex shape corresponding to the shape of the lens portion.

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