KR20220128918A - Display apparatus and manufacturing method thereof - Google Patents

Abstract

The display device is disclosed. The display device comprises a color conversion layer disposed on a micro light emitting element arranged in a plurality of grooves of a driving substrate so as to convert a first color light emitted from the micro light emitting element into a second color light. The color conversion layer comprises: light blocking patterns separated from the micro light emitting element and disposed to be separated on the same plane; a nano pore layer disposed between the light blocking patterns, separated from the micro light emitting element, and having a plurality of nano pores; and a quantum dot impregnated in the nano pore layer and converting the first color light into the second color light.

Description

Display apparatus and manufacturing method thereof

Exemplary embodiments relate to a display device and a method for manufacturing the same.

As a method for realizing a full color in a display device using a micro light emitting device, three methods are possible.

First, there is a method in which each of micro light emitting devices emitting red light, green light, and blue light is disposed in a sub-pixel, and then the color of the pixel is realized by color mixing. This method is the simplest method in structure, and it is possible to manufacture a display device by arranging a micro light emitting device that emits red, a micro light emitting device that emits green light, and a micro light emitting device that emits blue light at sub-pixel positions on a driving substrate. . However, in this method, it is difficult to control the concentration of indium (In), which is currently used as a material of a micro light emitting device emitting green light and red light, and thus uniformity may be deteriorated. In addition, in this method, a color shift according to the temperature of the micro light emitting device emitting red light may appear, and due to the difference in turn-on voltage and efficiency of the micro light emitting device emitting different colors in the driving circuit, there are three types. transistor arrangement is required, and consequently manufacturing complexity may increase, which has a more serious problem in micro light emitting devices in the micro unit.

In another way, a light-converting material is used in the packaging of a light-emitting device that emits blue light or ultraviolet light to cause emission of white light, which is converted into red light, green light, and blue light through a color filter array for each subpixel There is a way to release it. In this method, as the size of the micro light emitting device decreases, the packaging process of the micro light emitting device for emitting white light is difficult, and since the phosphor for white light conversion of the micro light emitting device has a section showing the highest efficiency, the light The distribution may not be uniform. In addition, since the color filter array is configured to block colors other than the corresponding color, about 2/3 of the total amount of light is lost.

As another method, there is a method in which a color conversion layer using quantum dots for converting blue light into red light or green light is disposed in a sub-pixel using a micro light emitting device emitting blue light. However, in this method, as the distance between quantum dots becomes narrower, nonradiative transfer increases by exciton quenching and electron coupling, etc., resulting in an increase in optical loss. In order to reduce the non-luminescent transition, a method of dispersing quantum dots in a transparent polymer has been studied, but since most of the blue light is not absorbed by the quantum dots, the light conversion efficiency (LCE) is reduced, and the unabsorbed blue light A problem of color mixing with this red light or green light occurred. Accordingly, in order to increase the absorption rate of blue light in the color conversion layer, a method of thickening the thickness of the color conversion layer using a transparent polymer was considered, but this caused deterioration of image quality and increased the thickness of the entire display device. .

An exemplary embodiment includes a micro light emitting device emitting blue light and a color conversion layer having quantum dots for changing blue light into red light and green light, while minimizing quenching phenomenon of quantum dots and providing quantum dots for blue light Provided are a display device capable of increasing the absorbance of the present invention and a method for manufacturing the same.

A display device according to an exemplary embodiment is

a driving substrate having a plurality of grooves;

a micro light emitting device arranged in the plurality of grooves and emitting light of a first color; and

a color conversion layer disposed on the micro light emitting device and converting light of the first color into light of a second color;

The color conversion layer,

a light blocking pattern spaced apart from the micro light emitting device and spaced apart on the same plane;

a nanoporous layer disposed between the light blocking patterns, spaced apart from the micro light emitting device, and having a plurality of nanopores;

Quantum dots impregnated in the nanoporous layer and converting the light of the first color into light of the second color may be included.

The light of the first color may be blue light, and the light of the second color may include red light and green light.

The quantum dots include a first quantum dot that converts the blue light into the red light, and a second quantum dot that converts the blue light into the green light, wherein the nanopore layer is a first quantum dot impregnated with the first quantum dot. It may include a first region and a second region in which the second quantum dots are impregnated.

The nanoporous layer may include a third region that transmits the blue light.

The nanopore layer may include a plurality of nanoparticles, and the nanopores may be defined by adjacent nanoparticles.

The size of the nanopores may be 1/5 to 1/20 of the wavelength of the light of the first color.

The size of the nanopores may be 10 nm to 50 nm.

The material of the nanoporous layer is titanium oxide (TiO2), zinc oxide (ZnO), barium peroxide (BaO2), glass, silicon oxide (SiOx), gallium nitride (GaN), indium gallium nitride (InGaN), transparent It may include at least one of a polymer material.

A transparent layer disposed between the micro light emitting device and the color conversion layer and transmitting the light of the first color; may further include.

The transparent layer may have a thermal conductivity of 1 W/mK or less.

A method of manufacturing a display device according to an embodiment,

It is disposed on the micro light emitting device emitting blue light, and has a red region that converts blue light into red light, a green region that converts the blue light into green light, and a blue region that transmits the blue light. A method of manufacturing a display device comprising a layer comprising:

The manufacturing step of the color conversion layer,

A light blocking pattern for dividing the red region, the green region, and the blue region on the base substrate, the first region and the second region having a plurality of nanopores and corresponding to the red region, the green region, and the blue region and forming a nanoporous layer having a third region;

impregnating the first region with first quantum dots that convert blue light into red light, and impregnating the second region with second quantum dots that convert blue light into green light;

It may include; disposing a transparent layer covering the upper portion of the nanoporous layer.

In the step of forming the nanoporous layer, a solution containing a plurality of nanoparticles is applied to the first region, the second region, and the third region, and the applied solution is evaporated and the nanoparticles are sintered ( For sintering), it can be heat treated at a temperature of 100 ℃ to 300 ℃.

In the step of impregnating the first and second quantum dots, a first quantum dot is provided to the nanoporous layer disposed in the first region by an inkjet printing method, and disposed in the second region by an inkjet printing method A second quantum dot may be provided to the nanoporous layer.

The diameter of the nanopore may be 1/5 to 1/20 of the wavelength of blue light.

The size of the nanopores may be 10 nm to 50 nm.

The material of the nanoporous layer is titanium oxide (TiO2), zinc oxide (ZnO), barium peroxide (BaO2), glass, silicon oxide (SiOx), gallium nitride (GaN), indium gallium nitride (InGaN), transparent It may include at least one of a polymer material.

The transparent layer may have a thermal conductivity of 1 W/mK or less.

arranging the micro light emitting device in a plurality of grooves of a driving substrate; and disposing the color conversion layer on the micro light emitting device, wherein in the disposing of the color conversion layer, the color conversion layer may be disposed such that the transparent layer faces the micro light emitting device .

In the step of arranging the micro light emitting devices in the plurality of grooves, the micro light emitting devices may be arranged by a fluidic self assembly method.

In the step of arranging the micro light emitting devices in the plurality of grooves, using a fluid self-aligning method, the micro light emitting devices are aligned with the grooves of the transfer substrate, and the micro light emitting devices aligned with the grooves of the transfer substrate are aligned with the driving substrate. It can be transferred to the plurality of grooves.

A display device and a method for manufacturing the same according to an exemplary embodiment include a micro light emitting device emitting blue light and a color conversion layer having quantum dots for changing blue light into red light and green light, while quenching quantum dots It is possible to minimize the quenching phenomenon and increase the absorbance of the quantum dots for blue light.

1 is a diagram conceptually showing a display device according to an exemplary embodiment;
FIG. 2 is a view for explaining the color conversion layer of FIG. 1 .
3 is a view for explaining a method of manufacturing a display device according to an embodiment.
4A and 4B are diagrams for explaining an embodiment in which micro light emitting devices are arranged using a fluid self-aligning method.
5A, 5B and 5C are diagrams for explaining another embodiment in which micro light-emitting devices are arranged using a fluid self-aligning method.
6 is a view for explaining a process of disposing a color conversion layer on a driving substrate.
7 to 9 are views for explaining a process of manufacturing the color conversion layer according to the embodiment.
Fig. 10 is a schematic block diagram of an electronic device according to an exemplary embodiment.
11 illustrates an example in which a display device according to an exemplary embodiment is applied to a mobile device.
12 shows an example in which the display device according to an exemplary embodiment is applied to a vehicle display device.
13 illustrates an example in which a display device according to an exemplary embodiment is applied to augmented reality glasses.
Fig. 14 shows an example in which a display device according to an exemplary embodiment is applied to a signage.
15 illustrates an example in which the display device according to an exemplary embodiment is applied to a wearable display.

Hereinafter, a display apparatus and a manufacturing method thereof according to various embodiments will be described in detail with reference to the accompanying drawings. In the following drawings, the same reference numerals refer to the same components, and the size of each component in the drawings may be exaggerated for clarity and convenience of description. Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The singular expression includes the plural expression unless the context clearly dictates otherwise. Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, in the drawings, the size or thickness of each component may be exaggerated for clarity of description. Further, when it is described that a predetermined material layer is present on a substrate or another layer, the material layer may exist in direct contact with the substrate or another layer, or another third layer may exist therebetween. In addition, since the materials constituting each layer in the following embodiments are exemplary, other materials may be used.

The specific implementations described in this embodiment are examples, and do not limit the technical scope in any way. For brevity of the specification, descriptions of conventional electronic components, control systems, software, and other functional aspects of the systems may be omitted. In addition, the connections or connecting members of the lines between the components shown in the drawings exemplify functional connections and/or physical or circuit connections, and in an actual device, various functional connections, physical connections that are replaceable or additional may be referred to as connections, or circuit connections.

The use of the term “above” and similar referential terms may be used in both the singular and the plural.

The steps constituting the method may be performed in any suitable order unless explicitly stated that they must be performed in the order described. In addition, the use of all exemplary terms (eg, etc.) is merely for describing the technical idea in detail, and unless limited by the claims, the scope of rights is not limited by these terms.

FIG. 1 is a diagram conceptually showing a display device 1 according to an exemplary embodiment, and FIG. 2 is for explaining the color conversion layer 100 of the display device 1 of FIG. 1 , part A of FIG. 1 . is an enlarged view of

Referring to FIG. 1 , a display device 1 according to the embodiment includes a driving substrate 10 , a micro light emitting device 20 disposed on the driving substrate 10 , and a color disposed on the micro light emitting device 20 . and a conversion layer 100 .

The driving substrate 10 includes a plurality of grooves 11 . The size of the groove 11 may be a size into which the micro light emitting device 20 can be inserted.

The driving substrate 10 may include a plurality of sub-pixel regions SP1 , SP2 , and SP3 . The plurality of sub-pixel areas SP1 , SP2 , and SP3 may include a first sub-pixel area SP1 , a second sub-pixel area SP2 , and a third sub-pixel area SP3 .

A plurality of grooves 11 may be disposed in each of the sub-pixel areas SP1 , SP2 , and SP3 . For example, two grooves 11 may be provided in the sub-pixel areas SP1 , SP2 , and SP3 . A micro light emitting device 20 may be provided in each of the two grooves 11 .

As the two grooves 11 are disposed in each of the sub-pixel areas SP1, SP2, and SP3, even if the micro light emitting device 20 is omitted from one groove 11 during the manufacturing process, the other groove 11 Since the micro light emitting device 20 may be provided in the , an error rate may be reduced and a repair process may be omitted.

However, the number of grooves 11 disposed in the sub-pixel areas SP1 , SP2 , and SP3 is not necessarily limited thereto, and may be one or three or more.

The driving substrate 10 may include a thin film transistor 13 for driving a micro light emitting device 20 to be described later. Other components for the operation of the micro light emitting device 20 may be included in the driving substrate 10 , but since this is common in the art, illustration and description thereof will be omitted.

The micro light emitting device 20 emits light of a first color and is disposed in the groove 11 of the driving substrate 10 . The plurality of micro light emitting devices 20 are arranged in each of the plurality of grooves 11 . The light LB of the first color may be blue light.

The plurality of micro light emitting devices 20 may emit blue light in a state in which positions are aligned by each of the plurality of grooves 11 .

The color conversion layer 100 is disposed on the micro light emitting device 20, and can convert the light LB of the first color emitted by the micro light emitting device 20 into the light LR and LG of the second color. have. The second color is different from the first color.

For example, when the light emitted by the micro light emitting device 20 is blue light, a partial region of the color conversion layer 100 converts blue light into red light, and another partial region of the color conversion layer 100 is blue. It can convert light into green light.

The color conversion layer 100 includes a red region R for converting blue light into red light, a green region G for converting blue light into green light, and a blue region B for transmitting blue light.

The color conversion layer 100 includes a light blocking pattern 120 spaced apart from each other on the same plane, a nano-porous layer 130 disposed between the light blocking pattern 120 , and quantum dots 141 impregnated in the nano-porous layer 130 . , 142).

The light blocking pattern 120 may be spaced apart from the micro light emitting device 20 and may be spaced apart from each other to distinguish a red region R, a green region G, and a blue region B on the same plane.

The light blocking pattern 120 may include a material that blocks light. For example, the light blocking pattern 120 may include an ultraviolet curing acrylic resin including a black pigment/dye, a urethane resin, an epoxy resin, or the like.

1 and 2 , the nanopore layer 130 is a layer spaced apart from the micro light emitting device 20 and may have a porous structure having a plurality of nanopores 131 . Since the nanoporous layer 130 is a structure spaced apart from the micro light emitting device 20, even if the light emitting device changes to a high temperature in the process of emitting light, it is possible to reduce the deterioration of the color conversion layer 100 by the light emitting device.

The nanoporous layer 130 may minimize the aggregation of the impregnated quantum dots 141 and 142 with each other through the porous structure.

The nanopore layer 130 may include a plurality of nanoparticles 133 such that the nanopores 131 are formed therein. The nanopores 131 may be defined by adjacent nanoparticles 133 . The size of the nanoparticles 133 may be determined in consideration of the size of the nanopores 131 .

However, the nanopore layer 130 is not necessarily formed of the nanoparticles 133 , and may have various configurations as long as it has a structure having the nanopores 131 . For example, the nanoporous layer 130 may be a porous glass having nanopores 131 .

The nanoporous layer 130 may be configured to scatter light LB of the first color. The size of the nanopores 131 may be determined in consideration of the wavelength of the light LB of the first color. For example, the size of the nanopores 131 may be 1/5 to 1/20 of the wavelength of the light LB of the first color. For example, the size of the nanopores 131 may be 10 nm to 50 nm. Here, the size of the nanopores 131 may be an average size of the nanopores 131 .

The material of the nanoporous layer 130 is titanium oxide (TiO ₂ ), zinc oxide (ZnO), barium peroxide (BaO2), glass, silicon oxide (SiOx), gallium nitride (GaN), indium gallium nitride (InGaN) ), and may include at least one of a transparent polymer material. The material of the nanoparticles 133 is titanium oxide (TiO ₂ ), zinc oxide (ZnO), barium peroxide (BaO2), glass, silicon oxide (SiOx), gallium nitride (GaN), indium gallium nitride (InGaN) , it may include at least one of a transparent polymer material. The transparent polymer material may be at least one of polyimide, silicone resin, acrylic resin, and epoxy resin.

The nanopores 131 of the nanopore layer 130 may be formed by dispersing a plurality of nanoparticles 133 . However, the method of forming the nano-pores 131 of the nano-pore layer 130 is not limited thereto, and may vary. For example, the nanopores 131 may be formed by phase separation etching or electrochemical etching.

The quantum dots 141 and 142 may convert light LB of a first color into light LR and LG of a second color.

The quantum dots 141 and 142 may have a core-shell structure having a core portion and a shell portion, or may have a particle structure without a shell. The core-shell structure may have a single-shell or a multi-shell. A multi-shell may be, for example, a double-shell.

The quantum dots 141 and 142 may include, for example, at least one of II-VI series semiconductors, III-V series semiconductors, IV-VI series semiconductors, IV series semiconductors, and graphene quantum dots 141 and 142. can The quantum dots 141 and 142 may include, for example, at least one of Cd, Se, Zn, S, and InP, but is not limited thereto. Each of the quantum dots 141 and 142 may have a diameter of several tens of nm or less, for example, a diameter of about 10 nm or less.

The quantum dots 141 and 142 may include a first quantum dot 141 that converts blue light into red light and a second quantum dot 142 that converts blue light into green light. The size of the second quantum dot 142 is different from the size of the first quantum dot 141 .

The quantum dots 141 and 142 are impregnated in the nanoporous layer 130 . The quantum dots 141 and 142 impregnated in the nanopore layer 130 are disposed in the nanopore 131 and may be attached to the surface of the nanoparticle 133 . The quantum dots 141 and 142 disposed in the nanopores 131 may secure a predetermined distance from the quantum dots 141 and 142 disposed in other nanopores 131 .

By securing a predetermined distance between the quantum dots 141 and 142, it is possible to prevent a decrease in the quantum yield due to quenching that occurs as the quantum dots 141 and 142 are continuously arranged. In addition, by inducing scattering of the light LB of the first color as the nanopore layer 130 has the nanopores 131 of a predetermined size, more quantum dots 141 and 142 are excited, thereby color conversion efficiency can be increased. In FIG. 2 , the red region R of the color conversion layer 100 is shown as the center, but the same operation may be performed in the green region G as well.

The first region 1301 of the nano-porous layer 130 disposed in the red region R is impregnated with the first quantum dots 141, and the second region of the nano-porous layer 130 disposed in the green region G. A second quantum dot 142 is impregnated in 1302 . The quantum dots 141 and 142 may not be impregnated in the third region 1303 of the nanoporous layer 130 disposed in the blue region B. Referring to FIG. In the first region 1301 , the blue light emitted from the micro light emitting device 20 is scattered by the nanoparticles 133 , and is converted into red light by more first quantum dots 141 and emitted. In the second region 1302 , blue light emitted from the micro light emitting device 20 is scattered by the nanoparticles 133 , and is converted into green light by more second quantum dots 142 and emitted. In the third region 1303 , the blue light emitted from the micro light emitting device 20 is emitted without color conversion.

A transparent layer 150 that transmits light of the first color LB may be disposed between the color conversion layer 100 and the micro light emitting device 20 .

The transparent layer 150 may transmit the light LB of the first color emitted from the micro light emitting device 20 , but may block heat transfer from the micro light emitting device 20 to the color conversion layer 100 . For example, the transparent layer 150 may have a thermal conductivity of 1 W/mK or less.

A base substrate 110 may be disposed on the color conversion layer 100 . The base substrate 110 may transmit light emitted through the nanoporous layer 130 . The base substrate 110 may be a transparent substrate. For example, the base substrate 110 may be a transparent glass substrate or a transparent plastic substrate.

3 is a view for explaining a method of manufacturing the display device 1 according to the embodiment.

Referring to FIG. 3 , in the method of manufacturing the display device 1 according to the embodiment, first, a driving substrate 10 having a plurality of grooves 11 is prepared ( S10 ).

The driving substrate 10 includes a plurality of grooves 11 . The size of the groove 11 may be a size into which the micro light emitting device 20 can be inserted.

The driving substrate 10 may include a plurality of sub-pixel regions SP1 , SP2 , and SP3 . The plurality of sub-pixel areas SP1 , SP2 , and SP3 include a first sub-pixel area SP1 , a second sub-pixel area SP2 , and a third sub-pixel area SP3 .

A plurality of grooves 11 may be disposed in each of the sub-pixel areas SP1 , SP2 , and SP3 . For example, two grooves 11 may be provided in the sub-pixel areas SP1 , SP2 , and SP3 .

The micro light emitting devices 20 emitting light of the first color are arranged in the plurality of grooves 11 (S20). In order to arrange the micro light emitting devices 20 at predetermined intervals, a fluidic self-assembly method may be used.

4A and 4B are diagrams for explaining an embodiment in which the micro light emitting devices 20 are arranged using a fluid self-aligning method. 5A, 5B and 5C are diagrams for explaining another embodiment in which the micro light emitting device 20 is arranged using a fluid self-aligning method.

As an example, as shown in FIG. 4A , the suspension 21 including the micro light emitting device 20 and the liquid 22 is supplied on the driving substrate 10, and the micro light emitting device ( 20 ) is aligned with the groove 11 of the driving substrate 10 . Thereafter, as shown in FIG. 4B , by removing the liquid 22 , the micro light emitting device 20 may be arranged in the groove 11 of the driving substrate 10 .

As another example, as shown in FIG. 5A , the suspension 21 including the micro light emitting device 20 and the liquid 22 is supplied to the driving substrate 10 and the other transfer substrate 30 , and the micro light emitting device 20 is applied. It is aligned with the groove 31 of the transfer substrate 30 . Next, as shown in FIG. 5B , the liquid 22 is removed and the micro light emitting device 20 is arranged in the groove 31 of the transfer substrate 30 . Thereafter, as shown in FIG. 5C , the grooves 31 of the transfer substrate 30 are aligned to match the grooves 11 of the driving substrate 10 , and the micro light emitting devices are arranged in the grooves 31 of the transfer substrate 30 . 20 may be transferred to the groove 11 of the driving substrate 10 .

In addition, the micro light emitting device 20 may be arranged in the groove 11 of the driving substrate 10 by using various fluid self-aligning methods.

6 is a view for explaining a process of disposing the color conversion layer 100 on the driving substrate 10 . 7 and 8 are diagrams for explaining a process of manufacturing the color conversion layer 100 according to the embodiment.

3 and 6 again, the color conversion layer 100 is disposed to be spaced apart on the micro light emitting device 20 (S30). For example, in the step of disposing the color conversion layer 100 , the color conversion layer 100 may be disposed such that the transparent layer 150 of the color conversion layer 100 faces the micro light emitting device 20 .

As the disposing of the color conversion layer 100 proceeds after the arrangement step of the micro light emitting device 20 , the quantum dots 141 and 142 of the color conversion layer 100 are formed in the arrangement process of the micro light emitting device 20 . It is possible to prevent the phenomenon of a decrease in efficiency.

If the color conversion layer 100 is disposed on the micro light emitting device 20 before the arranging step of the micro light emitting device 20, it is supplied while the fluid self-aligning method is in progress in the arranging step of the micro light emitting device 20 The efficiency of the quantum dots 141 and 142 of the color conversion layer 100 may be reduced by the liquid 22 .

In contrast, in the method of manufacturing the display device 1 according to the embodiment, as the color conversion layer 100 is disposed after the arrangement of the micro light emitting device 20 , the quantum dots 141 of the color conversion layer 100 , It is possible to prevent the 142 from being exposed to the liquid 22 to reduce the efficiency.

In addition, as the disposing of the color conversion layer 100 proceeds after the arrangement of the micro light emitting device 20 , the manufacturing step of the color conversion layer 100 is separate from the manufacturing step of the micro light emitting device 20 . can proceed. Accordingly, the nanoporous layer 130 of the color conversion layer 100 can be freely selected in consideration of light scattering characteristics, regardless of the material of the micro light emitting device 20 .

7 and 8 , in the manufacturing step of the color conversion layer 100 , a light blocking pattern (R), a green region (G) and a blue region (B) for separating the red region (R), the green region (B) on the base substrate 110 ( 120) and a plurality of nanopores 131, the first region 1301, the second region 1302, and the third region corresponding to the red region (R), the green region (G), and the blue region (B). The nanoporous layer 130 having 1303 may be formed.

In the step of forming the nanoporous layer 130 , a solution containing the nanoparticles 133 is applied on the base substrate 110 . 7 (a) and (b), when the light blocking pattern 120 is disposed on the base substrate 110, the red region (R), the green region (G), and the blue region (B) in the nano A solution containing particles 133 is applied. As shown in (a) to (c) of FIG. 8 , if the light blocking pattern 120 is in a state before the light blocking pattern 120 is formed on the base substrate 110 , a solution including the nanoparticles 133 is applied on the base substrate 110 as a whole. and a portion may be removed through patterning using a mask.

After the solution containing the nanoparticles 133 is applied, post-treatment is performed. The nanoparticles 133 may be applied by a spin coating method, an ink jet method, a screen printing method, a blade coating method, or the like. As an example of the solvent of the solution, acetyl alcohol, toluene, water and the like can be used. In the post-treatment step, heat treatment may be performed at a temperature of 100 °C to 300 °C for evaporation of the applied solution and sintering of the nanoparticles 133 . The heat treatment step may be performed for 10 minutes to 10 hours.

The formation order of the light blocking pattern 120 and the nano-porous layer 130 may vary. For example, after forming the light blocking pattern 120 as shown in FIG. 7 , the nano-porous layer 130 may be formed, or after forming the nano-porous layer 130 as shown in FIG. 8 , the light blocking pattern 120 may be formed. have.

Referring to FIG. 7C , the quantum dots 141 and 142 may be impregnated in the nanoporous layer 130 . In order to impregnate the quantum dots 141 and 142, an inkjet printing method may be used. By the inkjet printing method, the first quantum dots 141 may be applied to the first region 1301 , and the second quantum dots 142 may be applied to the second region 1302 . Since the quantum dots 141 and 142 can be selectively supplied only to the necessary regions through the inkjet printing method as described above, even with a small amount of the quantum dots 141 and 142, the quantum dots 141, 141, 142) can be impregnated.

Referring to FIG. 7D , after the quantum dots 141 and 142 are impregnated in the nanoporous layer 130 , a transparent layer 150 covering the upper portion of the nanoporous layer 130 is disposed. Through the transparent layer 150, a function of protecting the quantum dots 141 and 142 from the outside may be performed.

Meanwhile, in the above-described embodiment, a method in which the color conversion layer 100 is manufactured separately from the driving substrate 10 and then disposed on the driving substrate 10 has been mainly described. However, the disposition of the color conversion layer 100 is not necessarily limited thereto, and may be directly formed on the driving substrate 10 on which the light emitting devices are arranged.

For example, as shown in FIGS. 9A to 9C , a planarization layer 40 is formed on the driving substrate 10 in which the micro light emitting device 20 is arranged in the groove 11 , and a transparent layer is formed on the planarization layer 40 . 150 , the light blocking pattern 120 , the nanoporous layer 130 , and the base substrate 110 layer may be sequentially formed.

10 is a block diagram of an electronic device including a display device according to an exemplary embodiment.

Referring to FIG. 10 , an electronic device 8201 may be provided in a network environment 8200 . In the network environment 8200, the electronic device 8201 communicates with another electronic device 8202 through a first network 8298 (a short-range wireless communication network, etc.), or a second network 8299 (a long-distance wireless communication network, etc.) ) through another electronic device 8204 and/or the server 8208 . The electronic device 8201 may communicate with the electronic device 8204 through the server 8208 . The electronic device 8201 includes a processor 8220 , a memory 8230 , an input device 8250 , an audio output device 8255 , a display device 8260 , an audio module 8270 , a sensor module 8276 , and an interface 8277 . ), a haptic module 8279 , a camera module 8280 , a power management module 8288 , a battery 8289 , a communication module 8290 , a subscriber identification module 8296 , and/or an antenna module 8297 . can In the electronic device 8201, some of these components may be omitted or other components may be added. Some of these components may be implemented as one integrated circuit. For example, the sensor module 8276 (fingerprint sensor, iris sensor, illuminance sensor, etc.) may be implemented by being embedded in the display device 8260 (display, etc.).

The processor 8220 may execute software (such as a program 8240) to control one or a plurality of other components (hardware, software components, etc.) of the electronic device 8201 connected to the processor 8220, and , various data processing or operations can be performed. As part of data processing or computation, the processor 8220 loads commands and/or data received from other components (sensor module 8276, communication module 8290, etc.) into volatile memory 8232, and It may process commands and/or data stored in 8232 , and store the resulting data in non-volatile memory 8234 . The processor 8220 includes a main processor 8221 (central processing unit, application processor, etc.) and an auxiliary processor 8223 (graphics processing unit, image signal processor, sensor hub processor, communication processor, etc.) that can be operated independently or together. may include The auxiliary processor 8223 may use less power than the main processor 8221 and may perform a specialized function.

The coprocessor 8223 operates on behalf of the main processor 8221 while the main processor 8221 is in the inactive state (sleep state), or the main processor 8221 while the main processor 8221 is in the active state (the application execution state). Together with the processor 8221 , functions and/or states related to some of the components of the electronic device 8201 (display device 8260 , sensor module 8276 , communication module 8290 , etc.) may be controlled. can The auxiliary processor 8223 (image signal processor, communication processor, etc.) may be implemented as a part of other functionally related components (camera module 8280, communication module 8290, etc.).

The memory 2230 may store various data required by components (the processor 8220 , the sensor module 8276, etc.) of the electronic device 8201 . Data may include, for example, input data and/or output data for software (such as program 8240) and instructions related thereto. The memory 8230 may include a volatile memory 8232 and/or a non-volatile memory 8234 .

The program 8240 may be stored as software in the memory 8230 , and may include an operating system 8242 , middleware 8244 , and/or applications 8246 .

The input device 8250 may receive commands and/or data to be used in a component (eg, the processor 8220 ) of the electronic device 8201 from outside the electronic device 8201 (eg, a user). The input device 8250 may include a remote controller, a microphone, a mouse, a keyboard, and/or a digital pen (such as a stylus pen).

The sound output device 8255 may output a sound signal to the outside of the electronic device 8201 . The sound output device 8255 may include a speaker and/or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback, and the receiver can be used to receive incoming calls. The receiver may be integrated as a part of the speaker or may be implemented as an independent separate device.

The display device 8260 may visually provide information to the outside of the electronic device 8201 . The display device 8260 may include a control circuit for controlling a display, a hologram device, or a projector and a corresponding device. The display device 8260 may include the display device 1 described with reference to FIGS. 1 to 9 . The display device 8260 may include a touch circuitry configured to sense a touch, and/or a sensor circuitry configured to measure the intensity of force generated by the touch (such as a pressure sensor).

The audio module 8270 may convert a sound into an electric signal or, conversely, convert an electric signal into a sound. The audio module 8270 obtains a sound through the input device 8250 or other electronic device (such as the electronic device 8102) directly or wirelessly connected to the sound output device 8255 and/or the electronic device 8201 ) can output sound through the speaker and/or headphones.

The sensor module 8276 detects an operating state (power, temperature, etc.) of the electronic device 8201 or an external environmental state (user state, etc.), and generates an electrical signal and/or data value corresponding to the sensed state. can do. The sensor module 8276 may include a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (Infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, and/or an illuminance sensor. It may include a sensor.

The interface 8277 may support one or more specified protocols that may be used by the electronic device 8201 to directly or wirelessly connect with another electronic device (such as the electronic device 8102 ). The interface 8277 may include a High Definition Multimedia Interface (HDMI), a Universal Serial Bus (USB) interface, an SD card interface, and/or an audio interface.

The connection terminal 8278 may include a connector through which the electronic device 8201 may be physically connected to another electronic device (eg, the electronic device 8102 ). The connection terminal 8278 may include an HDMI connector, a USB connector, an SD card connector, and/or an audio connector (such as a headphone connector).

The haptic module 8279 may convert an electrical signal into a mechanical stimulus (vibration, movement, etc.) or an electrical stimulus that the user can perceive through tactile or kinesthetic sense. The haptic module 8279 may include a motor, a piezoelectric element, and/or an electrical stimulation device.

The camera module 8280 may capture still images and moving images. The camera module 8280 may include a lens assembly including one or more lenses, image sensors, image signal processors, and/or flashes. The lens assembly included in the camera module 8280 may collect light emitted from a subject to be imaged.

The power management module 8288 may manage power supplied to the electronic device 8201 . The power management module 8388 may be implemented as part of a Power Management Integrated Circuit (PMIC).

The battery 8289 may supply power to components of the electronic device 8201 . Battery 8289 may include a non-rechargeable primary cell, a rechargeable secondary cell, and/or a fuel cell.

Communication module 8290 establishes a direct (wired) communication channel and/or wireless communication channel between the electronic device 8201 and other electronic devices (electronic device 8102, electronic device 8104, server 8108, etc.); and performing communication through an established communication channel. The communication module 8290 may include one or more communication processors that operate independently of the processor 8220 (such as an application processor) and support direct communication and/or wireless communication. The communication module 8290 is a wireless communication module 8292 (a cellular communication module, a short-range wireless communication module, a Global Navigation Satellite System (GNSS, etc.) communication module) and/or a wired communication module 8294 (Local Area Network (LAN) communication). module, power line communication module, etc.). A corresponding communication module among these communication modules may be a first network 8298 (a short-range communication network such as Bluetooth, WiFi Direct, or Infrared Data Association (IrDA)) or a second network 8299 (a cellular network, the Internet, or a computer network (LAN). , WAN, etc.) through a telecommunication network) and may communicate with other electronic devices. These various types of communication modules may be integrated into one component (single chip, etc.) or implemented as a plurality of components (plural chips) separate from each other. The wireless communication module 8292 may use subscriber information stored in the subscriber identification module 8296 (such as an International Mobile Subscriber Identifier (IMSI)) within a communication network, such as the first network 8298 and/or the second network 8299 . may identify and authenticate the electronic device 8201 in .

The antenna module 8297 may transmit or receive signals and/or power to the outside (eg, other electronic devices). The antenna may include a radiator having a conductive pattern formed on a substrate (PCB, etc.). The antenna module 8297 may include one or a plurality of antennas. When a plurality of antennas are included, an antenna suitable for a communication method used in a communication network such as the first network 8298 and/or the second network 8299 from among the plurality of antennas is selected by the communication module 8290 . can Signals and/or power may be transmitted or received between the communication module 8290 and another electronic device through the selected antenna. In addition to the antenna, other components (such as RFIC) may be included as part of the antenna module 8297 .

Some of the components are connected to each other through communication methods between peripheral devices (bus, GPIO (General Purpose Input and Output), SPI (Serial Peripheral Interface), MIPI (Mobile Industry Processor Interface), etc.) and signals (commands, data, etc.) ) are interchangeable.

The command or data may be transmitted or received between the electronic device 8201 and the external electronic device 8204 through the server 8108 connected to the second network 8299 . The other electronic devices 8202 and 8204 may be the same or different types of electronic devices 8201 . All or some of the operations executed in the electronic device 8201 may be executed in one or more of the other electronic devices 8202 , 8204 , and 8208 . For example, when the electronic device 8201 needs to perform a function or service, it requests one or more other electronic devices to perform part or all of the function or service instead of executing the function or service itself. can One or more other electronic devices receiving the request may execute an additional function or service related to the request, and transmit a result of the execution to the electronic device 8201 . For this purpose, cloud computing, distributed computing, and/or client-server computing technologies may be used.

11 illustrates an example in which an electronic device according to an exemplary embodiment is applied to a mobile device. The mobile device 9100 may include a display device 911 according to an exemplary embodiment. The display device 911 may include the display device 1 described with reference to FIGS. 1 to 9 . The display device 911 may have a foldable structure and, for example, may be applied to a multi-folder display. Here, although the mobile device 9100 is illustrated as a clamshell display, it may be applicable to a general flat panel display.

12 shows an example in which a display device according to an exemplary embodiment is applied to a vehicle. The display device may be applied to a head-up display device for a vehicle. The head-up display device 9200 includes a display device 9210 provided in an area of the vehicle, and at least one light path changing member ( 9220).

13 illustrates an example in which the display device according to an exemplary embodiment is applied to augmented reality glasses or virtual reality glasses. The augmented reality glasses 9300 may include a projection system 9310 that forms an image, and at least one element 9320 that guides the image from the projection system 9310 into the user's eye. The projection system 9310 may include the display device 1 described with reference to FIGS. 1 to 9 .

Fig. 14 shows an example in which the display device according to an exemplary embodiment is applied to a large-sized signage. The signage 9400 may be used for outdoor advertisement using a digital information display, and may control advertisement contents and the like through a communication network. The signage 9400 may be implemented, for example, through the electronic device described with reference to FIG. 10 .

15 illustrates an example in which the display device according to an exemplary embodiment is applied to a wearable display. The wearable display 9500 may include the display device 1 described with reference to FIGS. 1 to 9 , and may be implemented through the electronic device described with reference to FIG. 10 .

The display device according to the exemplary embodiment may also be applied to various products such as a rollable TV and a stretchable display.

The above-described embodiments are merely exemplary, and various modifications and equivalent other embodiments are possible by those skilled in the art. Therefore, the true technical protection scope according to the exemplary embodiment should be determined by the technical spirit of the invention described in the claims below.

1: display device 10: drive board
11: groove 13: transistor
20: micro light emitting element 21: suspension
22: liquid 23: pressurizing member
100: color conversion layer 110: base substrate
120: light blocking pattern 130: nano-porous layer
1301: first area 1302: second area
1303: third region 131: nanopores
133: nanoparticles 140: quantum dots
141: first quantum dot 142: second quantum dot
150: transparent layer 30: transfer substrate
31: groove 40: planarization layer

Claims (20)

a driving substrate having a plurality of grooves;
a micro light emitting device arranged in the plurality of grooves and emitting light of a first color; and
a color conversion layer disposed on the micro light emitting device and converting light of the first color into light of a second color;
The color conversion layer,
a light blocking pattern spaced apart from the micro light emitting device and spaced apart on the same plane;
a nanoporous layer disposed between the light blocking patterns, spaced apart from the micro light emitting device, and having a plurality of nanopores;
and a quantum dot impregnated in the nanoporous layer for converting light of the first color into light of the second color. According to claim 1,
The light of the first color is blue light, and the light of the second color includes red light and green light. 3. The method of claim 2,
The quantum dots are
a first quantum dot for converting the blue light into the red light;
and a second quantum dot that converts the blue light into the green light,
The nano-porous layer,
a first region impregnated with the first quantum dots;
and a second region impregnated with the second quantum dot. 4. The method of claim 3,
The nano-porous layer,
and a third region that transmits the blue light. According to claim 1,
The nanoporous layer includes a plurality of nanoparticles,
wherein the nanopores are defined by adjacent nanoparticles. According to claim 1,
The size of the nanopores is 1/5 to 1/20 of the wavelength of the light of the first color, the display device. According to claim 1,
The nanopore size is 10 nm to 50 nm, the display device. According to claim 1,
The material of the nanoporous layer is titanium oxide (TiO2), zinc oxide (ZnO), barium peroxide (BaO2), glass, silicon oxide (SiOx), gallium nitride (GaN), indium gallium nitride (InGaN), transparent A display device comprising at least one of a polymer material. According to claim 1,
and a transparent layer disposed between the micro light emitting device and the color conversion layer and transmitting light of the first color. 10. The method of claim 9,
The display device of claim 1, wherein the transparent layer has a thermal conductivity of 1 W/mK or less. It is disposed on the micro light emitting device emitting blue light, and has a red region that converts blue light into red light, a green region that converts the blue light into green light, and a blue region that transmits the blue light. A method of manufacturing a display device comprising a layer comprising:
The manufacturing step of the color conversion layer,
A light blocking pattern for dividing the red region, the green region, and the blue region on the base substrate, the first region and the second region having a plurality of nanopores and corresponding to the red region, the green region, and the blue region and forming a nanoporous layer having a third region;
impregnating the first region with first quantum dots that convert blue light into red light, and impregnating the second region with second quantum dots that convert blue light into green light;
Disposing a transparent layer covering the upper portion of the nano-porous layer; comprising a, a method of manufacturing a display device. 12. The method of claim 11,
In the step of forming the nanoporous layer,
Applying a solution containing a plurality of nanoparticles to the first region, the second region and the third region,
Heat treatment at a temperature of 100 ° C. to 300 ° C. for evaporation of the applied solution and sintering of the nanoparticles, a method of manufacturing a display device. 13. The method of claim 12,
In the step of impregnating the first and second quantum dots,
A first quantum dot is provided on the nanoporous layer disposed in the first region by an inkjet printing method,
A method of manufacturing a display device for providing a second quantum dot to the nanoporous layer disposed in the second region by an inkjet printing method. 12. The method of claim 11,
The nanopore diameter is 1/5 to 1/20 of the wavelength of blue light, the method of manufacturing a display device. 12. The method of claim 11,
The nanopore size is 10 nm to 50 nm, a method of manufacturing a display device. 12. The method of claim 11,
The material of the nanoporous layer is titanium oxide (TiO2), zinc oxide (ZnO), barium peroxide (BaO2), glass, silicon oxide (SiOx), gallium nitride (GaN), indium gallium nitride (InGaN), transparent A method of manufacturing a display device comprising at least one of a polymer material. 12. The method of claim 11,
The transparent layer has a thermal conductivity of 1 W/mK or less, a method of manufacturing a display device. 12. The method of claim 11,
arranging the micro light emitting device in a plurality of grooves of a driving substrate; and
It further comprises; disposing the color conversion layer on the micro light emitting device,
In the step of disposing the color conversion layer,
A method of manufacturing a display device, wherein the color conversion layer is disposed such that the transparent layer faces the micro light emitting device. 19. The method of claim 18,
In the arranging of the micro light emitting devices in the plurality of grooves, the method of manufacturing a display device, wherein the micro light emitting devices are arranged by a fluidic self assembly method. 20. The method of claim 19,
In the step of arranging the micro light emitting device in the plurality of grooves,
Using the fluid self-aligning method, the micro light emitting device is aligned with the groove of the transfer substrate,
A method of manufacturing a display device, wherein the micro light emitting device aligned with the groove of the transfer substrate is transferred to the plurality of grooves of the driving substrate.

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