Display device

Abstract

A display device is provided. The display device comprises a first substrate including a plurality of subpixels, a plurality of first electrodes and a plurality of second electrodes spaced apart from each other and disposed on each of the plurality of subpixels on the first substrate, a plurality of light-emitting elements disposed such that both ends are placed on the first electrodes and the second electrodes, and a color control layer disposed on the plurality of light-emitting elements and disposed on each of the subpixels, wherein the plurality of subpixels includes a first subpixel that displays a first color and a second subpixel that displays a second color different from the first color, and the plurality of light-emitting elements include a first light-emitting element disposed on the first subpixel that emits a third color light and a second light-emitting element disposed on the second subpixel that emits the second color light, and the third color is different from the first color and the second color.

Description

Technology Field

[0001] The present invention relates to a display device. Background Technology

[0002] The importance of display devices is increasing along with the development of multimedia. In response to this, various types of display devices, such as Organic Light Emitting Displays (OLEDs) and Liquid Crystal Displays (LCDs), are being used.

[0003] A device for displaying images of a display device includes a display panel such as an organic light-emitting display panel or a liquid crystal display panel. Among these, as a light-emitting display panel, it may include a light-emitting element; for example, in the case of a light-emitting diode (LED), there are organic light-emitting diodes (OLEDs) that use organic materials as light-emitting materials and inorganic light-emitting diodes that use inorganic materials as light-emitting materials. The problem to be solved

[0004] The problem that the present invention aims to solve is to provide a display device with improved luminous efficiency by arranging light-emitting elements that emit different colored light in subpixels that display different colors.

[0005] The problems of the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0006] A display device according to one embodiment for solving the above problem comprises a first substrate including a plurality of subpixels, a plurality of first electrodes and a plurality of second electrodes spaced apart from each other and disposed on each of the plurality of subpixels on the first substrate, a plurality of light-emitting elements disposed such that both ends are placed on the first electrodes and the second electrodes, and a color control layer disposed on the plurality of light-emitting elements and disposed on each of the subpixels, wherein the plurality of subpixels includes a first subpixel that displays a first color and a second subpixel that displays a second color different from the first color, and the plurality of light-emitting elements include a first light-emitting element disposed on the first subpixel that emits a third color light and a second light-emitting element disposed on the second subpixel that emits the second color light, and the third color is different from the first color and the second color.

[0007] The light-emitting element has a phenomenon of being extended in one direction, and the length of the light-emitting element in the one direction may have a range of 500 nm to 10 µm.

[0008] The first color above may be red, the second color above may be blue, and the third color above may be green or cyan.

[0009] The color control layer may include a first wavelength conversion pattern disposed in the first subpixel that converts the third color light into the first color, and a first light transmission pattern disposed in the second subpixel that transmits the second color light.

[0010] The plurality of subpixels may further include a third subpixel representing the third color, and the plurality of light-emitting elements may further include a third light-emitting element disposed in the third subpixel and emitting the second color light.

[0011] The color control layer may further include a second wavelength conversion pattern disposed in the third subpixel and converting the second color light into the third color.

[0012] The plurality of subpixels may further include a third subpixel representing the third color, and the plurality of light-emitting elements may further include a third light-emitting element disposed in the third subpixel and emitting light of the third color.

[0013] The color control layer may further include a second light transmission pattern disposed in the third subpixel and transmitting the third color light.

[0014] It may further include a color filter layer comprising a first color filter disposed on the first wavelength conversion pattern and a second color filter disposed on the first light transmission pattern.

[0015] The third color light emitted by the first light-emitting element may have a peak wavelength in the range of 480 nm to 575 nm, and the second color light emitted by the second light-emitting element may have a peak wavelength in the range of 445 nm to 475 nm.

[0016] A display device according to another embodiment for solving the above problem comprises a first substrate including a plurality of subpixels, a plurality of first electrodes and a plurality of second electrodes spaced apart from each other on the first substrate, a plurality of light-emitting elements having a phenomenon extending in one direction and having both ends disposed on the first electrode and the second electrode of each subpixel, respectively, and a color control layer disposed on the plurality of light-emitting elements and provided for each of the subpixels, wherein the plurality of subpixels include a first subpixel that displays a first color and a second subpixel that displays a second color different from the first color, and the length of the light-emitting element in the one direction has a range of 500 nm to 10 µm, and the plurality of light-emitting elements include a first light-emitting element disposed on the first subpixel that emits a third color light and a second light-emitting element disposed on the second subpixel that emits the second color light, and the third color is different from the first color.

[0017] The above third color may be different from the above second color.

[0018] The first color above may be red, the second color above may be blue, and the third color above may be green or cyan.

[0019] The plurality of subpixels may further include a third subpixel representing the third color, and the plurality of light-emitting elements may further include a third light-emitting element disposed in the third subpixel and emitting the second color light.

[0020] The color control layer may include a first wavelength conversion pattern disposed in the first subpixel and converting the third color light into the first color, a first light transmission pattern disposed in the second subpixel and transmitting the second color light, and a second wavelength conversion pattern disposed in the third subpixel and converting the second color light into the third color.

[0021] The third color light emitted by the first light-emitting element may have a peak wavelength in the range of 480 nm to 575 nm, and the second color light emitted by the second light-emitting element may have a peak wavelength in the range of 445 nm to 475 nm.

[0022] The above third color may be the same as the above second color.

[0023] The first color is red, and the second and third colors may be green or cyan.

[0024] The plurality of subpixels further include a third subpixel representing the fourth color, and the plurality of light-emitting elements further include a third light-emitting element disposed in the third subpixel and emitting the fourth color light, and the fourth color may be blue.

[0025] The color control layer may include a first wavelength conversion pattern disposed in the first subpixel and converting the third color light into the first color, a first light transmission pattern disposed in the second subpixel and transmitting the second color light, and a second light transmission pattern disposed in the third subpixel and transmitting the fourth color light.

[0026] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0027] According to a display device of one embodiment, the luminous efficiency of the display device can be improved by arranging light-emitting elements that emit different colored light in each of the subpixels that display different colors.

[0028] The effects according to the embodiments are not limited to those exemplified above, and a wider variety of effects are included in this specification. Brief explanation of the drawing

[0029] FIG. 1 is a plan view of a display device according to one embodiment. FIG. 2 is a plan view showing a display device according to one embodiment. FIG. 3 is a cross-sectional view of a display device according to one embodiment. FIG. 4 is a schematic planar arrangement of one pixel of a light-emitting element layer according to one embodiment. Figure 5 is a cross-sectional view taken along the Qa-Qa' line, Qb-Qb' line and Qc-Qc' line of Figure 4. FIG. 6 is a schematic perspective view of a light-emitting element according to one embodiment. Figure 7 is an enlarged cross-sectional view showing an example of the Q region of Figure 5. Figure 8 is an enlarged cross-sectional view showing another example of the Q region of Figure 5. Figure 9 is a graph showing the luminous efficiency according to the size and type of the light-emitting element. FIG. 10 is a cross-sectional view of a display device according to another embodiment. FIG. 11 is a cross-sectional view of a display device according to another embodiment. FIG. 12 is a cross-sectional view of a display device according to another embodiment. FIG. 13 is a cross-sectional view of a display device according to another embodiment. FIG. 14 is a cross-sectional view of a display device according to another embodiment. FIG. 15 is a planar arrangement of light-emitting element layers according to another embodiment. FIG. 16 is a planar arrangement of light-emitting element layers according to another embodiment. Specific details for implementing the invention

[0030] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in other forms. That is, the present invention is defined only by the scope of the claims.

[0031] When elements or a layer are referred to as being "on" or "on" another element or layer, it includes not only being directly on top of the other element or layer but also cases where another layer or element is interposed in between. On the other hand, when an element is referred to as being "directly on" or "directly on," it indicates that no other element or layer is interposed in between.

[0032] The same reference numerals are used for identical or similar parts throughout the specification.

[0033] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0034] FIG. 1 is a plan view of a display device according to one embodiment.

[0035] Referring to FIG. 1, the display device (10) displays a video or a still image. The display device (10) may refer to any electronic device that provides a display screen. For example, a television, laptop, monitor, billboard, Internet of Things, mobile phone, smartphone, tablet PC (Personal Computer), electronic watch, smart watch, watch phone, head-mounted display, mobile communication terminal, electronic notebook, e-book, PMP (Portable Multimedia Player), navigation, game console, digital camera, camcorder, etc. that provide a display screen may be included in the display device (10).

[0036] The display device (10) includes a display panel that provides a display screen. Examples of display panels include an inorganic light-emitting diode display panel, an organic light-emitting diode display panel, a quantum dot light-emitting diode display panel, a plasma display panel, a field emission display panel, etc. In the following examples, an inorganic light-emitting diode display panel is used as an example of a display panel, but it is not limited thereto, and if the same technical concept is applicable, it can be applied to other display panels.

[0037] In the drawings of the embodiments describing the display device (10), a first direction (DR1), a second direction (DR2), and a third direction (DR3) are defined. The first direction (DR1) and the second direction (DR2) may be directions perpendicular to each other within a single plane. The third direction (DR3) may be a direction perpendicular to the plane where the first direction (DR1) and the second direction (DR2) are located. The third direction (DR3) is perpendicular to each of the first direction (DR1) and the second direction (DR2). In the embodiments describing the display device (10), the third direction (DR3) represents the thickness direction of the display device (10).

[0038] The display device (10) may have a rectangular shape that includes a long side and a short side where the first direction (DR1) on the plane is longer than the second direction (DR2). The corners where the long and short sides of the display device (10) on the plane meet may be right angles, but are not limited thereto, and may have a rounded curved shape. The planar shape of the display device (10) is not limited to the examples provided and may have other shapes such as a square, a square with rounded corners (vertices), other polygons, circles, etc.

[0039] The display surface of the display device (10) may be positioned on one side of the third direction (DR3), which is the thickness direction. Unless otherwise noted in the embodiments describing the display device (10), "top" indicates the display direction toward one side of the third direction (DR3), and "top surface" indicates the surface facing toward one side of the third direction (DR3). Additionally, "bottom" indicates the direction opposite to the display direction toward the other side of the third direction (DR3), and "bottom surface" refers to the surface facing toward the other side of the third direction (DR3). Furthermore, "left," "right," "top," and "bottom" indicate the direction when the display device (10) is viewed from a plane. For example, "right" indicates one side of the first direction (DR1), "left" indicates the other side of the first direction (DR1), "top" indicates one side of the second direction (DR2), and "bottom" indicates the other side of the second direction (DR2).

[0040] The display device (10) may include a display area (DA) and a non-display area (NDA). The display area (DA) is an area where the screen can be displayed, and the non-display area (NDA) is an area where the screen is not displayed.

[0041] The shape of the display area (DA) can follow the shape of the display device (10). For example, the shape of the display area (DA) may have a planar rectangular shape similar to the overall shape of the display device (10). The display area (DA) may generally occupy the center of the display device (10).

[0042] The display area (DA) may include a plurality of pixels (PX). The plurality of pixels (PX) may be arranged in a matrix direction. The shape of each pixel (PX) may be a planar rectangle or a square. However, not limited thereto, the shape of each pixel (PX) may be a rhombus shape with each side tilted toward one direction. Each pixel (PX) may be alternately arranged in a stripe type or a pentile type.

[0043] A non-display area (NDA) may be disposed around a display area (DA). The non-display area (NDA) may surround the display area (DA) in whole or in part. In an exemplary embodiment, the display area (DA) is rectangular in shape, and the non-display area (NDA) may be disposed adjacent to four sides of the display area (DA). The non-display area (NDA) may form the bezel of the display device (10). A pad portion on which wiring, circuit drivers, or external devices included in the display device (10) are mounted may be disposed in the non-display area (NDA).

[0044] FIG. 2 is a plan view showing a display device according to one embodiment.

[0045] Referring to FIG. 2, the display area (DA) of the display device (10) includes a plurality of pixels (PX) arranged along a plurality of rows and columns. A pixel (PX) represents a repeating minimum unit for display. To display full color, each pixel (PX) may include a plurality of subpixels (SPX: SPX1, SPX2, SPX3) that emit different colors. Each subpixel (SPX) may be sequentially repeated along a first direction (DR1) as a first subpixel (SPX1), a second subpixel (SPX2), and a third subpixel (SPX3). In an exemplary embodiment, each pixel (PX) may include a first subpixel (SPX1) responsible for emitting a first color light, a second subpixel (SPX2) responsible for emitting a second color light, and a third subpixel (SPX3) responsible for emitting a third color light. For example, the first color may be red, the second color may be green, and the third color may be blue.

[0046] Each subpixel (SPX) may include a light-emitting area (TA: TA1, TA2, TA3) defined by a pixel defining film and a light-blocking area (BA) around it.

[0047] The light-emitting region (TA) is a region where light emitted from the light-emitting element layer of the display device (10) described later is provided to the outside, and the light-blocking region (BA) may be a region where light emitted from the light-emitting element layer is not transmitted.

[0048] The light-emitting area (TA: TA1, TA2, TA3) may include a first light-emitting area (TA1), a second light-emitting area (TA2), and a third light-emitting area (TA3). The first to third light-emitting areas (TA1, TA2, TA3) may each be a light-emitting area (TA) of the first to third subpixels (SPX1, SPX2, SPX3). For example, the first light-emitting area (TA1) may be the light-emitting area (TA) of the first subpixel (SPX1), the second light-emitting area (TA2) may be the light-emitting area (TA) of the second subpixel (SPX2), and the third light-emitting area (TA3) may be the light-emitting area (TA) of the third subpixel (SPX3).

[0049] The first to third light emission regions (TA1, TA2, TA3) may be regions in which light having a predetermined peak wavelength is emitted to the outside of the display device (10). The first light emission region (TA1) may emit first color light, the second light emission region (TA2) may emit second color light, and the third light emission region (TA3) may emit third color light. For example, the first color light may be red light having a peak wavelength in the range of 610 nm to 650 nm, the second color light may be green light having a peak wavelength in the range of 520 nm to 575 nm, and the third color light may be blue light having a peak wavelength in the range of 440 nm to 475 nm, but is not limited thereto.

[0050] The first to third light-emitting regions (TA1, TA2, TA3) may be sequentially repeated along the first direction (DR1) in the display area (DA) of the display device (10). The planar shape of the first to third light-emitting regions (TA1, TA2, TA3) may be a rectangle in which the width of the second direction (DR2) is longer than the width of the first direction (DR1), but is not limited thereto.

[0051] In an exemplary embodiment, the width of the first direction (DR1) of the first light-emitting region (TA1), the width of the first direction (DR1) of the second light-emitting region (TA2), and the width of the first direction (DR1) of the third light-emitting region (TA3) may be substantially the same. However, the relationship between the widths of the first direction (DR1) of the first to third light-emitting regions (TA1, TA2, TA3) is not limited to the embodiment illustrated in FIG. 4. For example, the width of the first direction (DR1) of the first light-emitting region (TA1), the width of the first direction (DR1) of the second light-emitting region (TA2), and the width of the first direction (DR1) of the third light-emitting region (TA3) may be different from each other.

[0052] A light-blocking region (BA) may be arranged to surround a plurality of light-emitting regions (TA: TA1, TA2, TA3). The light-blocking region (BA) of one subpixel (SPX) abuts the light-blocking region (BA) of an adjacent subpixel (SPX) (regardless of whether it is a subpixel (SPX) within the same pixel (PX). The light-blocking regions (BA) of adjacent subpixels (SPX) may be connected as one, and furthermore, the light-blocking regions (BA) of all subpixels (SPX) may be connected as one, but are not limited thereto. The light-emitting regions (TA) of each adjacent subpixel (SPX) may be separated by the light-blocking region (BA).

[0053] FIG. 3 is a cross-sectional view of a display device according to one embodiment.

[0054] Referring to FIG. 3, the display device (10) may include a first substrate (SUB1), a circuit layer (CCL) disposed on the first substrate (SUB1), a light-emitting element layer (EML) disposed on the circuit layer (CCL), a color control layer (WCL, TPL1) disposed on the light-emitting element layer (EML), and a color filter layer (CF).

[0055] The first substrate (SUB1) may be an insulating substrate. The first substrate (SUB1) may be made of an insulating material such as glass, quartz, or polymer resin. The substrate (SUB) may be a rigid substrate, but may also be a flexible substrate capable of bending, folding, rolling, etc.

[0056] A circuit layer (CCL) for driving a pixel (PX) (or sub-pixel (SPX)) may be disposed on one side of the first substrate (SUB1). The circuit layer (CCL) may drive a light-emitting element layer (EML) by including at least one transistor.

[0057] A light-emitting element layer (EML) may be disposed on one side of the circuit layer (CCL). The light-emitting element layer (EML) may include a first bank (400), a second bank (600), a first electrode (210), a second electrode (220), a first contact electrode (710), a second contact electrode (720), a light-emitting element (ED), and a plurality of insulating layers (510, 520) and a filling layer (SL).

[0058] A first bank (400) may be disposed on a circuit layer (CCL). A first bank (400) may be disposed in each of the first to third light-emitting regions (TA1, TA2, TA3) of the first to third subpixels (SPX1, SPX2, SPX3). There may be a plurality of first banks (400) disposed in the first to third light-emitting regions (TA1, TA2, TA3), and each first bank (400) may be disposed spaced apart from each other along a first direction (DR1). In an exemplary embodiment, a first bank (400) disposed in the light-emitting region (TA) of each subpixel (SPX) may include a first sub-bank (410) and a second sub-bank (420). The first sub-bank (410) and the second sub-bank (420) may be disposed spaced apart from each other in the first direction (DR1).

[0059] The first electrode (210) may be placed on the first sub-bank (410) to cover the first sub-bank (410). The second electrode (220) may be placed on the second sub-bank (420) to cover the second sub-bank (420). The first electrode (210) and the second electrode (220) may be electrically insulated from each other.

[0060] The first insulating layer (510) is disposed on the first electrode (210) and the second electrode (220), and is disposed so as to expose at least a portion of the first electrode (210) and the second electrode (220). The first insulating layer (510) can protect the first electrode (210) and the second electrode (220) while simultaneously insulating them from each other. Additionally, it can prevent the light-emitting element (ED) disposed on the first insulating layer (51FTKSFKSCP0) from being damaged by direct contact with other components.

[0061] The second bank (600) is disposed on the first insulating layer (510) and may include an opening that exposes the first bank (400) and a plurality of light-emitting elements (ED) described later. The second bank (600) may be disposed at the boundary of a subpixel (SPX) to distinguish neighboring subpixels (SPX). The second bank (600) may be disposed across the boundary of neighboring subpixels (SPX). The second bank (600) may serve to prevent ink from overflowing into adjacent subpixels (SPX) in an inkjet printing process using ink in which a plurality of light-emitting elements (ED) are dispersed.

[0062] A light-emitting element (ED) may be placed on a first insulating layer (510) between a first sub-bank (410) and a second sub-bank (420). A light-emitting element (ED) may be placed on a first insulating layer (510) between the first and second electrodes (210, 220) such that both ends are placed on the first electrode (210) and the second electrode (220), respectively.

[0063] A plurality of light-emitting elements (ED) may include a light-emitting element (EDB1, hereinafter referred to as the 'first light-emitting element') disposed in a first subpixel (SPX1), a light-emitting element (EDB1, hereinafter referred to as the 'second light-emitting element') disposed in a second subpixel (SPX2), and a light-emitting element (EDB2, hereinafter referred to as the 'third light-emitting element') disposed in a third subpixel (SPX3).

[0064] In one embodiment, the colors of light emitted from light-emitting elements (ED: EDG1, EDB1, EDB2) placed in each subpixel (SPX: SPX1, SPX2, SPX3) may be different from each other. Among the light-emitting elements (ED: EDG1, EDB1, EDB2) placed in each subpixel (SPX: SPX1, SPX2, SPX3), the first light-emitting element (EDG1) placed in the first subpixel (SPX1) that emits at least the first color light to the outside of the display device (10) may emit the second color light. Among the light-emitting elements (ED: EDG1, EDB1, EDB2) placed in each subpixel (SPX: SPX1, SPX2, SPX3), the first light-emitting element (EDG1) placed in the first subpixel (SPX1) that emits a first color light to the outside of the display device (10) can emit a second color light, and the second light-emitting element (EDG2) placed in the second subpixel (SPX2) that emits a second color light to the outside of the display device (10) and the third light-emitting element (EDB2) placed in the third subpixel (SPX3) that emits a third color light to the outside of the display device (10) can emit a third color light. That is, among the light-emitting elements (ED: EDG1, EDB1, EDB2) placed in each subpixel (SPX: SPX1, SPX2, SPX3), the first light-emitting element (EDG1) placed in the first subpixel (SPX1) that emits at least red light to the outside of the display device (10) can emit green light or cyan light. For example, the first light-emitting element (EDG1) placed in the first subpixel (SPX1) can emit green light or cyan light of the second color, the second light-emitting element (EDB1) placed in the second subpixel (SPX2) can emit blue light of the third color, and the third light-emitting element (EDB2) placed in the third subpixel (SPX3) can emit blue light of the third color.

[0065] A first light-emitting element (EDG1) disposed in a first subpixel (SPX1) and second and third light-emitting elements (EDB1, EDB2) disposed in the second and third subpixels (SPX2, SPX3), respectively, may include active layers having different materials and may emit light of different wavelengths or light of different colors. The second and third light-emitting elements (EDB1, EDB2) disposed in the second and third subpixels (SPX2, SPX3), respectively, may include active layers having the same material and may emit light of the same wavelength or light of the same color.

[0066] A first light-emitting element (EDG1) placed in a first subpixel (SPX1) may be a second type light-emitting element (EDG) that emits green light or cyan light, and second and third light-emitting elements (EDB1, EDB2) placed in the second and third subpixels (SPX2, SPX3), respectively, may be a first type light-emitting element (EDB) that emits blue light. For example, the first type light-emitting element (EDB: EDB1, EDB2) may emit third color light or blue light having a peak wavelength in the range of 445 nm to 475 nm, and the second type light-emitting element (EDG) may emit second color light, green light, or cyan light having a peak wavelength in the range of 480 nm to 575 nm. Hereinafter, in this specification, a light-emitting element (ED) that emits a first color light having a peak wavelength in the range of 445 nm to 475 nm will be referred to as a first type light-emitting element (EDB), and a light-emitting element (ED) that emits a second color light having a peak wavelength in the range of 480 nm to 575 nm will be referred to as a second type light-emitting element (EDG).

[0067] In one embodiment, a first light-emitting element (EDG1) disposed in the first light-emitting region (TA1) of a first subpixel (SPX1) can emit second color light, green light, or cyan light having a peak wavelength in the range of 480 nm to 575 nm, and a second light-emitting element (EDB1) disposed in the second light-emitting region (TA2) of a second subpixel (SPX2) and a third light-emitting element (EDB2) disposed in the third light-emitting region (TA3) of a third subpixel (SPX3) can emit third color light or blue light having a peak wavelength in the range of 445 nm to 475 nm. Accordingly, among the light emitted from the light-emitting element layer (EML), at least the light emitted from the first subpixel (SPX1) can emit second color light, green light, or cyan light, and the light emitted from the third subpixel (SPX3) can emit third color light or blue light.

[0068] Depending on the color of light emitted by each subpixel (SPX: SPX1, SPX2, SPX3) to the outside of the display device (10), the color or wavelength band of light emitted by the light-emitting element (ED: EDG1, EDB1, EDB2) included in each subpixel (SPX: SPX1, SPX2, SPX3) may differ from one another. For example, as the size (or length in the extension direction) of the light-emitting element (ED) decreases, the luminous efficiency of the second type light-emitting element (EDG: EDG1) emitting second color light may be greater than the luminous efficiency of the first type light-emitting element (EDB: EDB1, EDB2) emitting third color light. Accordingly, by placing a second type light-emitting element (EDG: EDG1) that emits second color light in a subpixel that displays a color having a peak wavelength longer than the peak wavelength of the light that displays a third color, the light-emitting element layer (EML) of the display device (10) can be improved.

[0069] The second insulating layer (520) may be partially disposed on the light-emitting elements (ED: EDG1, EDB1, EDB2) disposed between the first sub-bank (410) and the second sub-bank (420). The second insulating layer (520) may be disposed to partially wrap the outer surface of the light-emitting elements (ED). The second insulating layer (520) may be disposed on the light-emitting elements (ED: EDG1, EDB1, EDB2), but may expose both ends of the light-emitting elements (ED). The second insulating layer (520) may serve the function of protecting the light-emitting elements (ED) and, at the same time, fixing the light-emitting elements (ED: EDG1, EDB1, EDB2) during the manufacturing process of the display device (10).

[0070] The first contact electrode (710) may be placed on the first electrode (210), and the second contact electrode (720) may be placed on the second electrode (220). The first contact electrode (710) and the second contact electrode (720) may be electrically insulated from each other.

[0071] The first and second contact electrodes (710, 720) can each come into contact with a light-emitting element (ED) and a plurality of electrodes (210, 220). Specifically, the first contact electrode (710) can come into contact with a portion of the first electrode (210) exposed by the first insulating layer (510) and one end of the light-emitting element (ED) exposed by the second insulating layer (520). The second contact electrode (720) can come into contact with a portion of the second electrode (220) exposed by the first insulating layer (510) and the other end of the light-emitting element (ED) exposed by the second insulating layer (520).

[0072] One end of the light-emitting element (ED) exposed by the second insulating layer (520) can be electrically connected to the first electrode (210) through the first contact electrode (710), and the other end can be electrically connected to the second electrode (220) through the second contact electrode (720).

[0073] The filling layer (SL) may be positioned to fill the area partitioned by the second bank (600). The filling layer (SL) may be positioned in an opening that includes the second bank (600) and exposes the first bank (400) and a plurality of light-emitting elements (ED). The filling layer (SL) may serve to flatten the step formed by the first bank (400) and the plurality of light-emitting elements (ED). For example, the filling layer (SL) may include an organic insulating material, such as an organic material such as polyimide (PI). The filling layer (SL) may be omitted.

[0074] The first protective layer (PAS1) can be disposed on the light-emitting element layer (EML). The first protective layer (PAS1) can serve to protect the light-emitting element layer (EML). The first protective layer (PAS1) can prevent damage to multiple light-emitting elements (ED) by preventing the penetration of impurities, such as moisture or air, from the outside.

[0075] The display device (10) may further include a first flattening layer (OC1), a first capping layer (CAP1), a first light-blocking member (BK1), a color control layer (WCL, TPL1), a second capping layer (CAP2), a second flattening layer (OC2), a second light-blocking member (BK2), a color filter layer (CF), a third capping layer (CAP3), and an encapsulation layer (ENC).

[0076] The first flattening layer (OC1) may be disposed on top of the light-emitting element layer (EML). The first flattening layer (OC1) may serve to flatten the step difference on top of the light-emitting element layer (EML). The first flattening layer (OC1) may include an organic material. For example, the first flattening layer (OC1) may include at least one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin.

[0077] A first capping layer (CAP1) may be disposed on a first planarization layer (OC1). The first capping layer (CAP1) may seal the lower surface of the color control layer (WCL, TPL1). The first capping layer (CAP1) may include an inorganic material. For example, the first capping layer (CAP1) may include at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and silicon oxynitride.

[0078] The first light-blocking member (BK1) may be placed on the first capping layer (CAP1). The first light-blocking member (BK1) may be placed in the light-blocking area (BA). The first light-blocking member (BK1) may overlap the second bank (600) and the display device (10) in the thickness direction (e.g., the third direction (DR3)). The first light-blocking member (BK1) can block the transmission of light. The first light-blocking member (BK1) can improve color reproduction by preventing light from encroaching and mixing between the first to third light-emitting areas (TA1, TA2, TA3). The first light-blocking member (BK1) may be formed in a grid shape that surrounds the first to third light-emitting areas (TA1, TA2, TA3) on a plane.

[0079] The first light-blocking member (BK1) may include an organic light-blocking material and a liquid-repellent component. Here, the liquid-repellent component may be composed of a fluorine-containing monomer or a fluorine-containing polymer, and specifically may include a fluorine-containing aliphatic polycarbonate. For example, the first light-blocking member (BK1) may be composed of a black organic material containing the liquid-repellent component.

[0080] A color control layer (WCL, TPL1) may be disposed on a first capping layer (CAP1) exposed by a first light-blocking member (BK1). The color control layer (WCL, TPL1) may include a wavelength conversion layer (WCL) that converts the wavelength of light incident on the color control layer (WCL, TPL1) and a first light transmission pattern (TPL1) that maintains and transmits the wavelength of light incident on the color control layer (WCL, TPL1).

[0081] The wavelength conversion layer (WCL) or the first light transmission pattern (TPL1) may be arranged so as to be separated for each subpixel (SPX). The wavelength conversion layer (WCL) or the first light transmission pattern (TPL1) is placed in the light-emitting region (TA), and adjacent wavelength conversion layers (WCL) and / or the first light transmission pattern (TPL1) may be separated from each other by a first light-blocking member (BK1) placed in the light-blocking region (BA).

[0082] The wavelength conversion layer (WCL) and the first light transmission pattern (TPL1) may be disposed on the first capping layer (CPL1). In some embodiments, the wavelength conversion layer (WCL) and the first light transmission pattern (TPL1) may be formed by an inkjet method. However, this is not limited thereto, and the wavelength conversion layer (WCL) and the first light transmission pattern (TPL1) may each be formed by applying a photosensitive material, exposing it to light, and developing it to form a pattern. Hereinafter, the case in which the wavelength conversion layer (WCL) and the first light transmission pattern (TPL1) are formed by an inkjet method will be described by way of example.

[0083] A wavelength conversion layer (WCL) may be disposed in a subpixel (SPX) where the wavelength of light incident from the light-emitting element layer (EML) is different from the color of the corresponding subpixel (SPX) and thus requires wavelength conversion. A first light transmission pattern (TPL1) may be disposed in a subpixel (SPX) where the wavelength of light incident from the light-emitting element layer (EML) is the same as the color of the corresponding subpixel (SPX). In the illustrated embodiment, a second color light is incident from the light-emitting element layer (EML) of the first subpixel (SPX1), and a third color light is incident from the second subpixel (SPX2) and the third subpixel (SPX3). In this case, a wavelength conversion layer (WCL) is disposed in the first subpixel (SPX1) and the second subpixel (SPX2), respectively, and a first light transmission pattern (TPL1) is disposed in the third subpixel (SPX3).

[0084] In an exemplary embodiment, the wavelength conversion layer (WCL) may include a first wavelength conversion pattern (WCL1) disposed in a first subpixel (SPX1) and a second wavelength conversion pattern (WCL2) disposed in a second subpixel (SPX2).

[0085] The first wavelength conversion pattern (WCL1) may be placed within a first light-emitting area (TA1) partitioned by a first light-blocking member (BK1) in the first subpixel (SPX1). The first wavelength conversion pattern (WCL1) may convert light of a second color wavelength incident from the light-emitting element layer (EML) into light of a first color wavelength different from the second color and emit it. For example, the first wavelength conversion pattern (WCL1) may convert green light or cyan light incident from the light-emitting element layer (EML) into red light and emit it.

[0086] The first wavelength conversion pattern (WCL1) may include a first base resin (BRS1) and a first wavelength conversion material (WCP1) dispersed within the first base resin (BRS1). The first wavelength conversion pattern (WCL1) may further include a first scatterer (SCP1) dispersed within the first base resin (BRS1). Although not limited thereto, the weight percentage (wt%) of the first wavelength conversion material (WCP1) included in the first wavelength conversion pattern (WCL1) may be 30 wt% to 40 wt%, and the weight percentage (wt%) of the first scatterer (SCP1) may be 10 wt% or less.

[0087] The second wavelength conversion pattern (WCL2) may be placed within the second light-emitting area (TA2) partitioned by the first light-blocking member (BK1) in the second subpixel (SPX2). The second wavelength conversion pattern (WCL2) can convert light of a third color wavelength incident from the light-emitting element layer (EML) into light of a second color wavelength different from the third color and emit it. For example, the second wavelength conversion pattern (WCL2) can convert blue light incident from the light-emitting element layer (EML) into green light and emit it.

[0088] The second wavelength conversion pattern (WCL2) may include a second base resin (BRS2) and a second wavelength conversion material (WCP2) dispersed within the second base resin (BRS2). The second wavelength conversion pattern (WCL2) may further include a second scatterer (SCP2) dispersed within the second base resin (BRS2). Although not limited thereto, the weight percentage (wt%) of the second wavelength conversion material (WCP2) included in the second wavelength conversion pattern (WCL2) may be 40 wt% to 50 wt%, and the weight percentage (wt%) of the second scatterer (SCP2) may be 10 wt% or less.

[0089] The first light transmission pattern (TPL1) can be placed within the third light emission area (TA3) partitioned by the first light-blocking member (BK1) in the third subpixel (SPX3). The first light transmission pattern (TPL1) can emit light of a third color wavelength incident from the light-emitting element layer (EML) while maintaining its wavelength. For example, the first light transmission pattern (TPL1) transmits blue light incident from the light-emitting element layer (EML) while maintaining its wavelength.

[0090] The first light transmission pattern (TPL1) may include a third base resin (BRS3). The first light transmission pattern (TPL) may further include a third scatterer (SCP3) dispersed within the third base resin (BRS3). Although not limited thereto, the weight percentage (wt%) of the third scatterer (SCP3) included in the first light transmission pattern (TPL1) may be 10 wt% or less.

[0091] The first to third base resins (BRS1, BRS2, ​​BRS3) may include a transparent organic material. For example, the first to third base resins (BRS1, BRS2, ​​BRS3) may be composed of an epoxy resin, an acrylic resin, a cardo resin, or an imide resin. The first to third base resins (BRS1, BRS2, ​​BRS3) may all be composed of the same material, but are not limited thereto.

[0092] The first to third scatterers (SCP1, SCP2, SCP3) may have refractive indices different from the first to third base resins (BRS1, BRS2, ​​BRS3).

[0093] The third scattering body (SCP1, SCP2, SCP3) may include metal oxide particles or organic particles. Examples of the metal oxides include titanium oxide (TiOx), zirconium oxide (ZrOx), aluminum oxide (AlxOy), indium oxide (InxOy), zinc oxide (ZnO), or tin oxide (SnOx), and examples of the organic particle materials include acrylic resin or urethane resin. The first to third scattering bodies (SCP1, SCP2, SCP3) may all be composed of the same material, but are not limited thereto.

[0094] The first wavelength conversion material (WCP1) may be a material that converts a second color into a first color, and the second wavelength conversion material (WCP2) may be a material that converts a third color into a second color. For example, the first wavelength conversion material (WCP1) may be a material that converts green light or cyan light into red light, and the second wavelength conversion material (WCP2) may be a material that converts blue light into green light. The first wavelength conversion material (WCP1) and the second wavelength conversion material (WCP2) may be quantum dots, quantum rods, phosphors, etc. The quantum dots may include group IV nanocrystals, group II-VI compound nanocrystals, group III-V compound nanocrystals, group IV-VI nanocrystals, or a combination thereof.

[0095] A second capping layer (CAP2) may be disposed on the color control layer (WCL, TPL1) and the first light-blocking member (BK1) to cover them. For example, the second capping layer (CAP2) may seal the first wavelength conversion pattern (WCL1), the second wavelength conversion pattern (WCL2), the first light transmission pattern (TPL1), and the first light-blocking member (BK1) to prevent damage or contamination of the first wavelength conversion pattern (WCL1), the second wavelength conversion pattern (WCL2), and the light transmission pattern (TPL). The second capping layer (CAP2) may be made of an inorganic material. The second capping layer (CAP2) may be made of the same material as the first capping layer (CAP1) or may be made of the material exemplified in the first capping layer (CAP1).

[0096] The second flattening layer (OC2) is disposed on top of the second capping layer (CAP2) and can serve to flatten the step difference between the first and second wavelength conversion patterns (WCL1, WCL2) and the first light transmission pattern (TPL1). The second flattening layer (OC2) may include an organic material. For example, the second flattening layer (OC2) may include at least one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin.

[0097] The second light-blocking member (BK2) may be disposed on the second flattening layer (OC2). The second light-blocking member (BK2) may be disposed in a light-blocking region (BA) along the boundary of a subpixel (SPX) on the second flattening layer (OC2). The second light-blocking member (BK2) may overlap the first light-blocking member (BK1) and / or the second bank (600) with the display device (10) in the thickness direction (e.g., the third direction (DR3)). The second light-blocking member (BK2) may serve to block light emission as well as suppress external light reflection. The second light-blocking member (BK2) may be formed in a grid shape surrounding the first to third light-emitting regions (TA1, TA2, TA3) on a plane.

[0098] The second light-blocking member (BK2) may be formed by including an organic material. In one embodiment, the second light-blocking member (BK2) may include a light-absorbing material that absorbs a visible light wavelength band. As the second light-blocking member (BK2) includes a light-absorbing material and is positioned along the boundary of each subpixel (SPX), the second light-blocking member (BK2) may define the light-emitting region (TA: TA1, TA2, TA3) of each subpixel (SPX). That is, the second light-blocking member (BK2) may be a subpixel defining film that defines the light-emitting region (TA) of each subpixel (SPX).

[0099] A color filter layer (CF) may be disposed on the second flattening layer (OC2). The color filter layer (CF) may be disposed on one side of the second flattening layer (OC2) in an area partitioned by the second light-blocking member (BK2).

[0100] The color filter layer (CF) may include a first color filter (CF1), a second color filter (CF2), and a third color filter (CF3).

[0101] A first color filter (CF1) may be placed in the first light-emitting area (TA1) of a first subpixel (SPX1), a second color filter (CF2) may be placed in the second light-emitting area (TA2) of a second subpixel (SPX2), and a third color filter (CF3) may be placed in the third light-emitting area (TA3) of a third subpixel (SPX3). The first to third color filters (CF1, CF2, CF3) may be surrounded by a second light-blocking member (BK2).

[0102] The first to third color filters (CF1, CF2, CF3) may include a colorant, such as a dye or pigment, that absorbs wavelengths other than the corresponding color wavelength. The first color filter (CF1) may selectively transmit a first color light (e.g., red light) and block or absorb a second color light (e.g., green light or cyan light) and a third color light (e.g., blue light). The second color filter (CF2) may selectively transmit a second color light (e.g., green light) and block or absorb a first color light (e.g., red light) and a third color light (e.g., blue light). The third color filter (CF3) may selectively transmit a third color light (e.g., blue light) and block or absorb a first color light (e.g., red light) and a second color light (e.g., green light). For example, the first color filter (CF1) may be a red color filter, the second color filter (CF2) may be a green color filter, and the third color filter (CF3) may be a blue color filter.

[0103] The first to third color filters (CF1, CF2, CF3) can absorb a portion of the light entering from outside the display device (10) to reduce reflected light caused by external light. Accordingly, the first to third color filters (CF1, CF2, CF3) can prevent color distortion caused by external light reflection.

[0104] By placing the color filter layer (CF) on the first and second wavelength conversion patterns (WCL1, WCL2) and the first light transmission pattern (TPL) through the second planarization layer (OC2), the display device (10) may not require a separate substrate for the color filter layer (CF). Accordingly, the thickness of the display device (10) may be relatively reduced.

[0105] The third capping layer (CAP3) can be placed on the color filter layer (CF) and the second light-blocking member (BK2) to cover them. The third capping layer (CAP3) can serve to protect the color filter layer (CF).

[0106] The encapsulation layer (ENC) may be disposed on the third capping layer (CAP3). For example, the encapsulation layer (ENC) may include at least one inorganic film to prevent oxygen or moisture from penetrating. Additionally, the encapsulation layer (ENC) may include at least one organic film to protect the display device (10) from foreign substances such as dust.

[0107] FIG. 4 is a schematic planar arrangement of one pixel of a light-emitting element layer according to one embodiment.

[0108] Referring to FIG. 4, as described above, one pixel (PX) may include a plurality of subpixels (SPX: SPX1, SPX2, SPX3).

[0109] Each subpixel (SPX) of the display device (10) may include a light-emitting region (EMA) and a non-light-emitting region (not shown). The light-emitting region (EMA) is a region where light emitted from a light-emitting element (ED: EDG1, EDB1, EDB2) is emitted, and the non-light-emitting region may be a region where light is not emitted because the light emitted from the light-emitting element (ED: EDG1, EDB1, EDB2) does not reach it.

[0110] The light-emitting region (EMA) may include a region where light-emitting elements (ED: EDG1, EDB1, EDB2) are placed and an adjacent region. The light-emitting region (EMA) may further include a region where light emitted from light-emitting elements (ED: EDG1, EDB1, EDB2) is reflected or refracted by other members and emitted.

[0111] Each subpixel (SPX) may further include a first region (CBA) disposed in a non-emissive region. The first region (CBA) may be disposed on one side (e.g., the upper side in FIG. 4) of the second direction (DR2) of the emitting region (EMA). The first region (CBA) may be disposed between the emitting regions (EMA) of the subpixels (SPX) disposed adjacently in the second direction (DR2).

[0112] The light-emitting regions (EMA) of each subpixel (SPX) included in a pixel (PX) may be arranged spaced apart from each other along a first direction (DR1). Likewise, the first regions (CBA) of each subpixel (SPX) included in a pixel (PX) may be arranged spaced apart from each other along a first direction (DR1). The light-emitting regions (EMA) and the first regions (CBA) are each arranged spaced apart from each other along a first direction (DR1), but the light-emitting regions (EMA) and the first regions (CBA) may be arranged alternately in a second direction (DR2).

[0113] The first region (CBA) may be a region where the first and second electrodes (210, 220) placed in each subpixel (SPX) adjacent to each other in the second direction (DR2) are separated. Each subpixel (SPX) adjacent to each other along the second direction (DR2) may include the first and second electrodes (210, 220) extended in the second direction (DR2), and the first and second electrodes (210, 220) may be separated from the first region (CBA). Accordingly, a portion of the first and second electrodes (210, 220) placed in each subpixel (SPX) may be placed in the first region (CBA).

[0114] Hereinafter, with reference to FIGS. 4 and FIGS. 5, the structure of the circuit layer (CCL) disposed on the first substrate (SUB1) and the light-emitting element layer (EML) disposed on the circuit layer (CCL) will be described in detail.

[0115] Figure 5 is a cross-sectional view taken along the Qa-Qa' line, Qb-Qb' line and Qc-Qc' line of Figure 4.

[0116] Meanwhile, FIG. 5 shows only the cross-sectional structure of the first subpixel (SPX1) including the first light-emitting element (EDG1). The cross-sectional structures of the second subpixel (SPX2) and the third subpixel (SPX3), which include the second light-emitting element (EDB1) and the third light-emitting element (EDB2), and the cross-sectional structure of the first subpixel (SPX1) differ only in the type of light-emitting element (ED: EDG1, EDB1, EDB2) included in each subpixel (SPX), but the arrangement of other components and the relative arrangement relationship between the light-emitting element (ED: EDG1, EDB1, EDB2) and other components are similar; therefore, the description of the cross-sectional structure of the first subpixel (SPX1) will replace the description of the cross-sectional structures of the second and third subpixels (SPX2, SPX3).

[0117] Referring to FIG. 5, the circuit layer (CCL) may include a lower metal layer (BML), a buffer layer (120), first to third conductive layers (140, 160, 180), a semiconductor layer and a gate insulating film (130), an interlayer insulating film (150), a passivation layer (170), and a via layer (190).

[0118] A lower metal layer (BML) may be disposed on a first substrate (SUB1). The lower metal layer (BML) may be a light-blocking layer that serves to protect the active material layer (ACT) of the transistor (TR) from external light. The lower metal layer (BML) may include a material that blocks light. For example, the lower metal layer (BML) may be formed of an opaque metallic material that blocks the transmission of light.

[0119] The lower metal layer (BML) has a patterned shape. The lower metal layer (BML) may be positioned to cover at least the channel region of the active material layer (ACT) of the transistor (TR) from the bottom, and furthermore, may be positioned to cover the entire active material layer (ACT) of the transistor (TR). However, it is not limited thereto, and the lower metal layer (BML) may be omitted.

[0120] A buffer layer (120) may be placed on a lower metal layer (BML). The buffer layer (120) may be placed to cover the front surface of a first substrate (SUB1) on which the lower metal layer (BML) is placed. The buffer layer (120) may serve to protect the transistor (TR) from moisture penetrating through the first substrate (SUB1), which is susceptible to moisture permeability. The buffer layer (120) may be composed of a plurality of inorganic layers that are alternately stacked. For example, the buffer layer (120) may be formed as a multilayer in which inorganic layers comprising at least one of silicon oxide (SiOx), silicon nitride (SiNx), and silicon oxynitride (SiOxNy) are alternately stacked.

[0121] The semiconductor layer may be placed on the buffer layer (120). The semiconductor layer may include an active material layer (ACT) of the transistor (TR). The active material layer (ACT) may be placed overlapping with the lower metal layer (BML).

[0122] Meanwhile, the drawing shows only one transistor (TR) among the transistors included in one subpixel (SPX) of the display device (10), but is not limited thereto. Each subpixel (SPX) of the display device (10) may include a larger number of transistors. For example, the display device (10) may include two or three transistors per subpixel (SPX).

[0123] The semiconductor layer may include polycrystalline silicon, single-crystal silicon, oxide semiconductors, etc.

[0124] In an exemplary embodiment, when the semiconductor layer comprises polycrystalline silicon, the polycrystalline silicon may be formed by crystallizing amorphous silicon. When the semiconductor layer comprises polycrystalline silicon, the active material layer (ACT) may comprise a plurality of doped regions doped with impurities and channel regions between them. In another exemplary embodiment, the semiconductor layer may comprise an oxide semiconductor. The oxide semiconductor may be, for example, indium-tin oxide (ITO), indium-zinc oxide (IZO), indium-gallium oxide (IGO), indium-zinc-tin oxide (IZTO), indium-gallium-zinc oxide (IGZO), indium-gallium-tin oxide (IGTO), indium-gallium-zinc-tin oxide (IGZTO), etc.

[0125] The gate insulating film (130) may be disposed on a semiconductor layer. The gate insulating film (130) may function as a gate insulating film for a transistor (TR). The gate insulating film (130) may be composed of an inorganic layer including an inorganic material, such as silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiOxNy), or may be formed in a stacked structure.

[0126] The first conductive layer (140) may be disposed on the gate insulating film (130). The first conductive layer (140) may include the gate electrode (GE) of the transistor (TR) and the first capacitance electrode (CSE) of the storage capacitor.

[0127] The gate electrode (GE) may be positioned to overlap the channel region of the active material layer (ACT) in the third direction (DR3). The first capacitance electrode (CSE) may be positioned to overlap the second source / drain electrode (SD2) of the transistor (TR) described later in the third direction (DR3). The first capacitance electrode (CSE) may be positioned to overlap the second source / drain electrode (SD2) in the third direction (DR3) so that a storage capacitor may be formed between them. In some embodiments, the first capacitance electrode (CSE) and the gate electrode (GE) may be integrated into a single layer. A portion of the integrated layer may include the gate electrode (GE), and another portion may include the first capacitance electrode (CSE).

[0128] The first conductive layer (140) may be formed as a single layer or a multilayer composed of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof. However, it is not limited thereto.

[0129] An interlayer insulating film (150) is disposed on the first conductive layer (140). The interlayer insulating film (150) may be disposed to cover the first conductive layer (140). The interlayer insulating film (150) may include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiOxNy).

[0130] A second conductive layer (160) is disposed on an interlayer insulating film (150). The second conductive layer (160) may include a first source / drain electrode (SD1) and a second source / drain electrode (SD2) of a transistor (TR), and a data line (DTL).

[0131] The first and second source / drain electrodes (SD1, SD2) can be electrically connected to both end regions of the active material layer (ACT) of the transistor (TR) (e.g., each doped region of the active material layer (ACT) of the transistor (TR)) through contact holes penetrating the interlayer insulating film (150) and the gate insulating film (130), respectively. Additionally, the second source / drain electrode (SD2) of the transistor (TR) can be electrically connected to the lower metal layer (BML) through another contact hole penetrating the interlayer insulating film (150), the gate insulating film (130), and the buffer layer (120).

[0132] The data line (DTL) can apply a data signal to another transistor (not shown) included in the display device (10). Although not shown in the drawing, the data line (DTL) can be connected to the source / drain electrodes of the other transistor.

[0133] The second conductive layer (160) may be formed as a single layer or a multilayer composed of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof. However, it is not limited thereto.

[0134] A passivation layer (170) is disposed on the second conductive layer (160). The passivation layer (170) serves to cover and protect the second conductive layer (160). The passivation layer (170) may include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), or silicon oxynitride (SiOxNy).

[0135] A third conductive layer (180) is disposed on the passivation layer (170). The third conductive layer (180) may include a first power wiring (VL1), a second power wiring (VL2), and a first conductive pattern (CDP).

[0136] A high potential voltage (or, first power voltage) is supplied to the first power wiring (VL1), and a low potential voltage (or, second power voltage) lower than the high potential voltage (first power voltage) supplied to the first power wiring (VL1) may be supplied to the second power wiring (VL2). The second power wiring (VL2) may be electrically connected to the second electrode (22) to supply the low potential voltage (second power voltage) to the second electrode (22). Additionally, an alignment signal required to align light-emitting elements (ED: EDG1, EDB1, EDB2) may be applied to the second power wiring (VL2) during the manufacturing process of the display device (10).

[0137] The first conductive pattern (CDP) can be electrically connected to the second source / drain electrode (SD2) of the transistor (TR) through a contact hole penetrating the passivation layer (170). The first conductive pattern (CDP) can be electrically connected to the first electrode (210) through the first contact hole (CT1) described later, so that the first power voltage applied from the first power wiring (VL1) can be transmitted to the first electrode (210).

[0138] The third conductive layer (180) may be formed as a single layer or a multilayer made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof. However, it is not limited thereto.

[0139] A via layer (190) is disposed on the third conductive layer (180). The via layer (190) may be disposed on the passivation layer (170) on which the third conductive layer (180) is disposed. The via layer (190) may serve to flatten the surface. The via layer (190) may include an organic insulating material, such as an organic material such as polyimide (PI).

[0140] Hereinafter, with reference to FIGS. 3 to 5, the structure of the light-emitting element layer (EML) disposed on the via layer (190) will be described in detail.

[0141] The light-emitting element layer (EML) may be disposed on the via layer (190) of the circuit element layer (CCL). The light-emitting element layer (EML) may include a plurality of light-emitting elements (ED: EDG1, EDB1, EDB2), a first bank (400), a second bank (600), first and second electrodes (210, 220), first and second contact electrodes (710, 720), a plurality of insulating layers (510, 520, 530, 540), and a filling layer (SL).

[0142] The first bank (400) may be placed on the via layer (190). The first bank (400) may have a shape that extends in a second direction (DR2) within each subpixel (SPX) in a planar shape. The first bank (400) may be spaced apart and terminated within a light-emitting region (EMA) partitioned by the second bank (600) so as not to extend to an adjacent subpixel (SPX) in the second direction (DR2).

[0143] The first bank (400) may include a first sub-bank (410) and a second sub-bank (420). The first sub-bank (410) and the second sub-bank (420) may be arranged to be spaced apart from each other in a first direction (DR1). For example, the first sub-bank (410) may be placed on the left side of the planar light-emitting region (EMA), and the second sub-bank (420) may be placed on the right side of the planar light-emitting region (EMA). The spaced-apart space formed by the first sub-bank (410) and the second sub-bank (420) being spaced apart from each other may provide an area in which a plurality of light-emitting elements (ED: EDG1, EDB1, EDB2) are arranged.

[0144] The first bank (400) may have a structure in which at least a portion protrudes upward (e.g., one side of the third direction (DR3)) relative to the upper surface of the via layer (190). The protruding portion of the first bank (400) may have an inclined side.

[0145] The first bank (400) can include an inclined side and change the direction of propagation of light emitted from the light-emitting elements (ED: EDG1, EDB1, EDB2) and traveling toward the side of the first bank (400) to an upward direction (e.g., display direction). That is, the first bank (400) provides a space where the light-emitting elements (ED: EDG1, EDB1, EDB2) are placed, and at the same time, it can also serve as a reflective barrier that changes the direction of propagation of light emitted from the light-emitting elements (ED: EDG1, EDB1, EDB2) to a display direction.

[0146] Meanwhile, although the drawing shows the side of the first bank (400) as being inclined in a linear shape, it is not limited thereto. For example, the side (or outer surface) of the first bank (400) may have the shape of a curved semicircle or semi-ellipse. In an exemplary embodiment, the first bank (400) may include an organic insulating material such as polyimide (PI), but is not limited thereto.

[0147] The first electrode (210) and the second electrode (220) may be disposed on the first bank (400) and the via layer (190) exposed by the first bank (400). Specifically, the first electrode (210) may be disposed on the first sub-bank (410), and the second electrode (220) may be disposed on the second sub-bank (420).

[0148] The first electrode (210) and the second electrode (220) may each have a shape that extends in a second direction (DR2) in a planar shape. The first electrode (210) and the second electrode (220) may be arranged to face each other in a first direction (DR1) apart. The planar shape of the first electrode (210) and the second electrode (220) may substantially have a shape similar to the planar shape of the first sub-bank (410) and the second sub-bank (420), respectively, but the area may be larger.

[0149] The first electrode (210) may be extended in a second direction (DR2) in a planar manner to overlap with a portion of the second bank (600) extended in a first direction (DR1). The first electrode (210) may contact a first conductive pattern (CDP) through a first contact hole (CT1) penetrating the via layer (190). The first electrode (210) may be electrically connected to a transistor (TR) through the first conductive pattern (CDP).

[0150] The second electrode (220) may be extended in a planar second direction (DR2) to overlap with a portion of the second bank (600) extended in the first direction (DR1). The second electrode (220) may contact the second power wiring (VL2) through a second contact hole (CT2) penetrating the via layer (190).

[0151] In the drawing, the first contact hole (CT1) and the second contact hole (CT2) are shown to be placed overlapping with the second bank (600), but are not limited thereto. For example, the first contact hole (CT1) and the second contact hole (CT2) may not overlap with the second bank (600) and may be placed within the light-emitting area (EMA) surrounded by the second bank (600).

[0152] The first electrode (210) and the second electrode (220) can each be separated from other electrodes (210, 220) included in subpixels (SPX) adjacent to the second direction (DR2) in the first region (CBA) within the subpixel (SPX). Such shapes of the first electrode (210) and the second electrode (220) can be formed through a process of disconnecting each electrode (210, 220) in the first region (CBA) after the process of placing light-emitting elements (ED: EDG1, EDB1, EDB2) during the manufacturing process of the display device (10). However, this is not limited thereto, and in some embodiments, the first and second electrodes (210, 220) may be extended to the subpixels (SPX) adjacent to the second direction (DR2) and arranged as an integral, or only one of the first electrode (210) or the second electrode (220) may be separated.

[0153] The shape and arrangement of the first electrode (210) and the second electrode (220) arranged for each subpixel (SPX) are not particularly limited as long as at least some portions of the first electrode (210) and the second electrode (220) are arranged facing each other so that a space for the light-emitting element (ED) to be arranged is formed.

[0154] The first electrode (210) may be placed on the first sub-bank (410) to cover the outer surface of the first sub-bank (410). The first electrode (210) may extend outward from the side of the first sub-bank (410) and may also be partially placed on the upper surface of the via layer (190) exposed by the first sub-bank (410) and the second sub-bank (420).

[0155] The second electrode (220) may be placed on the second sub-bank (420) to cover the outer surface of the second sub-bank (420). The second electrode (220) may extend outward from the side of the second sub-bank (420) and may also be partially placed on the upper surface of the via layer (190) exposed by the first sub-bank (410) and the second sub-bank (420). The first electrode (210) and the second electrode (220) may be spaced apart from each other in a first direction (DR1) to expose at least a portion of the via layer (190) in the area between the first sub-bank (410) and the second sub-bank (420).

[0156] The first and second electrodes (210, 220) are each electrically connected to light-emitting elements (EDs), and a predetermined voltage may be applied to the first and second electrodes (210, 220) so that the light-emitting elements (EDs) emit light. For example, the first and second electrodes (210, 220) may be electrically connected to a light-emitting element (ED) placed between the first electrode (210) and the second electrode (220) through the first and second contact electrodes (710, 720) described later, and an electrical signal may be transmitted to the light-emitting element (ED) through the first and second contact electrodes (710, 720).

[0157] The first and second electrodes (210, 220) may be utilized to form an electric field within a subpixel (SPX) to align a light-emitting element (ED). The light-emitting element (ED) may be positioned between the first electrode (210) and the second electrode (220) by the electric field formed on the first electrode (210) and the second electrode (220).

[0158] The first insulating layer (510) may be disposed on the first and second electrodes (210, 220). The first insulating layer (510) may be disposed on the first electrode (210) and the second electrode (220) and may include an opening (OP) that exposes at least a portion of the first electrode and the second electrode (220). Through the opening (OP) included in the first insulating layer (510), the first and second electrodes (210, 220) may be electrically connected to the first and second contact electrodes (710, 720), respectively.

[0159] The first insulating layer (510) can protect the first electrode (210) and the second electrode (220) while simultaneously insulating them from each other. Additionally, it can prevent the light-emitting element (30) disposed on the first insulating layer (510) from being damaged by direct contact with other components.

[0160] The second bank (600) may be placed on the first insulating layer (510). The second bank (600) may be arranged in a grid pattern in the portions extending in the first direction (DR1) and the second direction (DR2) on the plane. The second bank (600) may be placed across the boundaries of each subpixel (SPX) to distinguish neighboring subpixels (SPX). Additionally, the second bank (600) may be formed to have a greater height than the first bank (400) so as to serve to prevent ink in which different light-emitting elements (ED), namely the first to third light-emitting elements (EDG1, EDB1, EDB2), are dispersed from each other during the inkjet printing process for aligning light-emitting elements (ED) during the manufacturing process of the display device (10) from overflowing into adjacent subpixels (SPX: SPX1, SPX2, SPX3V).

[0161] A light-emitting element (ED: EDG1, EDB1, EDB2) can be placed on a first insulating layer (510) between the first electrode (210) and the second electrode (210, 220) such that one end is placed on the first electrode (210) and the other end is placed on the second electrode (220).

[0162] The second insulating layer (520) may be partially disposed on the light-emitting element (ED). The second insulating layer (520) may be disposed on the light-emitting element (ED) placed between the first electrode (210) and the second electrode (220), while exposing both ends of the light-emitting element (ED). The second insulating layer (520) may be disposed to partially cover the outer surface of the light-emitting element (ED). The second insulating layer (520) may protect the light-emitting element (ED) and, at the same time, serve to fix the light-emitting element (ED) during the manufacturing process of the display device (10).

[0163] Although not shown in the drawing, as described above, the material forming the second insulating layer (520) is placed between the first electrode (210) and the second electrode (220), and may also be filled in the empty space between the first insulating layer (510) formed by the indentation and the light-emitting element (ED).

[0164] The first and second contact electrodes (710, 720) may be disposed on the second insulating layer (520). The first contact electrode (710) and the second contact electrode (720) may each have a shape extending in the second direction (DR2). The first contact electrode (710) and the second contact electrode (720) may be disposed to be spaced apart and facing each other in the first direction (DR1).

[0165] The first contact electrode (710) may be placed on the first electrode (210). The first contact electrode (710) may contact the first electrode (210) exposed by the opening (OP) included in the first insulating layer (510), and may contact one end of the light-emitting element (ED) exposed by the second insulating layer (520). That is, the first contact electrode (710) may contact one end of the light-emitting element (ED) and the first electrode (210), respectively, to electrically connect the light-emitting element (ED) and the first electrode (210).

[0166] A third insulating layer (530) is disposed on the first contact electrode (710). The third insulating layer (530) can serve to electrically insulate the first contact electrode (710) and the second contact electrode (720) from each other. The third insulating layer (530) is disposed to cover the first contact electrode (710), but may not be disposed on the other end of the light-emitting element (ED) so that the light-emitting element (ED) can come into contact with the second contact electrode (720).

[0167] A second contact electrode (720) may be placed on the second electrode (220). The second contact electrode (720) may contact the second electrode (220) exposed by the opening (OP) included in the first insulating layer (510), and may contact the other end of the light-emitting element (ED) exposed by the second insulating layer (520) and the third insulating layer (530). That is, the second contact electrode (720) may contact the other end of the light-emitting element (ED) and the second electrode (220), respectively, to electrically connect the light-emitting element (ED) and the second electrode (220).

[0168] One end of the light-emitting element (ED) exposed by the second insulating layer (520) can be electrically connected to the first electrode (210) through the first contact electrode (710), and the other end can be electrically connected to the second electrode (220) through the second contact electrode (720).

[0169] The first and second contact electrodes (710, 720) may include a conductive material. For example, they may include ITO, IZO, ITZO, aluminum (Al), etc. As an example, the first and second contact electrodes (710, 720) may include a transparent conductive material, but are not limited thereto.

[0170] The fourth insulating layer (540) can be placed over the entire surface of the first substrate (SUB1). The fourth insulating layer (540) can function to protect the member placed on the first substrate (SUB1) from the external environment.

[0171] Each of the above-described first insulating layer (510), second insulating layer (520), third insulating layer (530) and fourth insulating layer (540) may include an inorganic insulating material or an organic insulating material.

[0172] The filling layer (SL) can be placed on the fourth insulating layer (540). The filling layer (SL) can be placed on the fourth insulating layer (540) in the opening partitioned by the second bank (600). The filling layer (SL) can serve to flatten the step formed by a plurality of members placed below.

[0173] FIG. 6 is a schematic perspective view of a light-emitting element according to one embodiment.

[0174] Referring to FIG. 6, the light-emitting element (ED) may be a particle-shaped element and may have a shape that extends in one direction. The light-emitting element (ED) may be a rod, tube, or cylindrical shape having a predetermined aspect ratio. The length of the light-emitting element (ED) is greater than the diameter of the light-emitting element (ED), and the aspect ratio may be 1.2:1 to 100:1, but is not limited thereto.

[0175] The light-emitting element (ED) may have a size ranging from a nanometer scale (1 nm or more and less than 1 µm) to a micrometer scale (1 µm or more and less than 1 mm). In one embodiment, the light-emitting element (ED) may have both a diameter and a length of a nanometer scale or both of micrometer scales. In some other embodiments, the diameter of the light-emitting element (ED) may have a size of a nanometer scale, while the length of the light-emitting element (ED) may have a size of a micrometer scale. In some embodiments, some of the light-emitting elements (ED) may have a diameter and / or length of a nanometer scale, while other parts of the light-emitting elements (ED) may have a diameter and / or length of a micrometer scale.

[0176] According to one embodiment, the light-emitting element (ED) may have a length (h) in the extension direction ranging from 500 nm to 10 μm, and preferably from 500 nm to 1 μm. The light-emitting element (ED) may have different luminous efficiency (EQE) depending on the size of the light-emitting element (ED) or the length (h) in the extension direction of the light-emitting element (ED). Additionally, the light-emitting element (ED) may have different luminous efficiency (EQE) depending on the length (h) in the extension direction of the light-emitting element (ED) and the light-emitting element (ED) that emits different colored light by including different active layers (33). A detailed description thereof will be provided later with reference to other drawings.

[0177] The light-emitting element (ED) may include an inorganic light-emitting diode. The inorganic light-emitting diode may include a plurality of semiconductor layers. For example, the inorganic light-emitting diode may include a first conductivity type (e.g., n-type) semiconductor layer, a second conductivity type (e.g., p-type) semiconductor layer, and an active semiconductor layer interposed between them. The active semiconductor layer receives holes and electrons from the first conductivity type semiconductor layer and the second conductivity type semiconductor layer, respectively, and the holes and electrons reaching the active semiconductor layer can combine with each other to emit light.

[0178] In one embodiment, the semiconductor layers described above may be sequentially stacked along the length direction of the light-emitting element (ED). As illustrated in FIG. 6, the light-emitting element (ED) may include a first semiconductor layer (31), an active layer (33), and a second semiconductor layer (32) sequentially stacked along the length direction. The first semiconductor layer (31), the active layer (33), and the second semiconductor layer (32) may each be the first conductivity type semiconductor layer, the active semiconductor layer, and the second conductivity type semiconductor layer described above.

[0179] The first semiconductor layer (31) may be doped with a first conductivity type dopant. The first conductivity type dopant may be Si, Ge, Sn, etc. In an exemplary embodiment, the first semiconductor layer (31) may be n-GaN doped with n-type Si.

[0180] The second semiconductor layer (32) may be spaced apart from the first semiconductor layer (31) with an active layer (33) in between. The second semiconductor layer (32) may be doped with a second conductivity type dopant such as Mg, Zn, Ca, Se, Ba, etc. In an exemplary embodiment, the second semiconductor layer (32) may be p-GaN doped with p-type Mg.

[0181] The active layer (33) may include a material having a single or multiple quantum well structure. As described above, the active layer (33) may emit light by the coupling of electron-hole pairs according to an electrical signal applied through the first semiconductor layer (31) and the second semiconductor layer (32).

[0182] In some embodiments, the active layer (33) may have a structure in which semiconductor materials with a large band gap energy and semiconductor materials with a small band gap energy are alternately stacked, and may include different group 3 to group 5 semiconductor materials depending on the wavelength of the light emitted.

[0183] In one embodiment, a first light-emitting element (EDG1) disposed in a first subpixel (SPX1) that emits second color light includes an active layer (33) containing nitrogen (N) and can emit green light or cyan light. Additionally, second and third light-emitting elements (EDB1, EDB2) disposed in second and third subpixels (SPX2, SPX3) that emit third color light include an active layer (33) containing nitrogen (N) and can emit blue light.

[0184] The first light-emitting element (EDG1) included in the first subpixel (SPX1) can emit a second color, namely green light or cyan light. When the first light-emitting element (EDG1) emits light in the green or cyan wavelength range, the active layer (33) of the first light-emitting element (EDG1) may include materials such as AlGaN or AlGaInN. For example, the active layer (33) of the first light-emitting element (EDG1) can emit green or cyan light having a center wavelength range of 480 nm to 575 nm.

[0185] The second and third light-emitting elements (EDB1, EDB2) included in the second and third subpixels (SPX2, SPX3), respectively, can emit a third color, namely blue light. When the second and third light-emitting elements (EDB1, EDB2) emit light in the blue wavelength range, the active layer (33) of the second and third light-emitting elements (EDB1, EDB2) may include materials such as AlGaN, AlGaInN, etc. For example, the active layer (33) of the second and third light-emitting elements (EDB1, EDB2) may include AlGaInN as a quantum layer and AlInN as a well layer. For example, the active layer (33) of the second and third light-emitting elements (EDB1, EDB2) may emit blue light having a central wavelength range of 445 nm to 475 nm.

[0186] The light emitted from the active layer (33) can be emitted not only from the outer surface in the longitudinal direction of the light-emitting element (ED), but also from both sides. That is, the light emitted from the active layer (33) is not limited to a single direction of emission.

[0187] The light-emitting element (ED) may further include an electrode layer (37) disposed on the second semiconductor layer (32). The electrode layer (37) may be in contact with the second semiconductor layer (32). The electrode layer (37) may be an ohmic contact electrode, but is not limited thereto, and may be a Schottky contact electrode.

[0188] The electrode layer (37) can be positioned between the second semiconductor layer (32) and the contact electrodes (710, 720) to reduce resistance when the two ends of the light-emitting element (ED) and the contact electrodes (710, 720) are electrically connected to apply an electrical signal to the first semiconductor layer (31) and the second semiconductor layer (32). The electrode layer (37) may include at least one of aluminum (Al), titanium (Ti), indium (In), gold (Au), silver (Ag), ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), and ITZO (Indium Tin-Zinc Oxide). The electrode layer (37) may also include an n-type or p-type doped semiconductor material.

[0189] The light-emitting element (ED) may further include an insulating film (38) that surrounds the outer surface of the first semiconductor layer (31), the second semiconductor layer (32), the active layer (33), and / or the electrode layer (37). The insulating film (38) is positioned to surround at least the outer surface of the active layer (33) and may extend in one direction in which the light-emitting element (ED) extends. The insulating film (38) can perform the function of protecting the above components. The insulating film (38) is made of materials having insulating properties and can prevent an electrical short circuit that may occur when the active layer (33) comes into direct contact with the electrode through which an electrical signal is transmitted to the light-emitting element (ED). In addition, since the insulating film (38) protects the outer surface of the first and second semiconductor layers (31, 32), including the active layer (33), it can prevent a decrease in light-emitting efficiency.

[0190] Figure 7 is an enlarged cross-sectional view showing an example of the Q region of Figure 5.

[0191] Referring to FIG. 7, the light-emitting element (ED) is arranged such that one extended direction is parallel to the first substrate (SUB1), and a plurality of semiconductor layers included in the light-emitting element (ED) can be arranged sequentially along a direction parallel to the upper surface of the first substrate (SUB1). Specifically, the light-emitting element (ED) can have a first semiconductor layer (31), an active layer (33), a second semiconductor layer (32), and an electrode layer (37) formed sequentially in a direction parallel to one surface of the first substrate (SUB1) on a cross-section spanning both ends. The light-emitting element (ED) can be aligned such that one end of the light-emitting element (ED) where the second semiconductor layer (32) is located is placed on the first electrode (210), and the other end of the light-emitting element (ED) where the first semiconductor layer (31) is located is placed on the second electrode (220). However, not limited thereto, some light-emitting elements (ED) may have one end of the light-emitting element (ED) where the second semiconductor layer (32) is located placed on the second electrode (220), and the other end of the light-emitting element (ED) where the first semiconductor layer (31) is located placed on the first electrode (210).

[0192] Both ends of the light-emitting element (ED) exposed by the second insulating layer (52) can each come into contact with the first contact electrode (710) and the second contact electrode (720).

[0193] The first contact electrode (710) can be in contact with one end of the light-emitting element (ED). The first contact electrode (710) can be in contact with the electrode layer (37) placed at one end of the light-emitting element (ED). The first contact electrode (710) can be electrically connected to the second semiconductor layer (32) through the electrode layer (37) of the light-emitting element (ED).

[0194] The second contact electrode (720) can be in contact with the other end of the light-emitting element (ED). The second contact electrode (720) can be in contact with the first semiconductor layer (31) placed at the other end of the light-emitting element (ED).

[0195] One end of the light-emitting element (ED) where the second semiconductor layer (32) is located is electrically connected to the first electrode (210) through the first contact electrode (710), and the other end of the light-emitting element (ED) where the first semiconductor layer (31) is located can be electrically connected to the second electrode (220) through the second contact electrode (720). That is, the light-emitting element (ED) can receive an electrical signal from the first and second electrodes (210, 220) by having both ends contact the first contact electrode (710) and the second contact electrode (720), respectively, and light can be emitted from the active layer (33) of the light-emitting element (ED) according to the electrical signal.

[0196] Figure 8 is an enlarged cross-sectional view showing another example of the Q region of Figure 5.

[0197] Referring to FIG. 8, the difference between this embodiment and the embodiment of FIG. 7 is that the third insulating layer (530) is omitted.

[0198] Specifically, the first contact electrode (710) and the second contact electrode (720) may be placed directly on the second insulating layer (520). The first contact electrode (710) and the second contact electrode (720) may be spaced apart from each other on the second insulating layer (520) to expose a portion of the second insulating layer (520). The second insulating layer (520) exposed by the first contact electrode (710) and the second contact electrode (720) may come into contact with the fourth insulating layer (540) in the exposed area.

[0199] In this embodiment, even if the third insulating layer (530) is omitted, the display device (10) can perform the function of fixing the light-emitting element (ED) by the second insulating layer (520) containing an organic insulating material. In addition, the first contact electrode (710) and the second contact electrode (720) can be patterned and formed simultaneously by a single mask process. Therefore, since no additional mask process is required to form the first contact electrode (710) and the second contact electrode (720), process efficiency can be improved. This embodiment is identical to the embodiment of FIG. 7 except that the third insulating layer (530) is omitted, so redundant descriptions will be omitted.

[0200] Figure 9 is a graph showing the luminous efficiency according to the size and type of the light-emitting element.

[0201] In the graph of FIG. 9, the X-axis represents the size of the light-emitting element (ED), and the Y-axis represents the luminous efficiency (EQE) of the light-emitting element. The unit of the X-axis may be μm, and the unit of the Y-axis may be %. The luminous efficiency (EQE, External Quantum Efficiency or External Quantum Efficiency) of the light-emitting element is the ratio of conversion into quanta or electrons according to the driving current, and may represent the ratio of light energy emitted to the outside of the light-emitting element.

[0202] In the graph of FIG. 9, #ED1 represents the luminous efficiency (EQE) by size of a first type light-emitting element (EDB) that emits third color light, i.e., a light-emitting element (EDB) that emits blue light, and #ED2 may represent the luminous efficiency (EQE) by size of a second type light-emitting element (EDG) that emits second color light, i.e., a light-emitting element (ED) that emits green light or cyan light. The first type light-emitting element (EDB) emits third color light or blue light having a peak wavelength in the range of 445 nm to 475 nm, and the second type light-emitting element (EDG) emits second color light, green light, or cyan light having a peak wavelength in the range of 480 nm to 575 nm.

[0203] Referring to the graph in Fig. 9, it can be seen that both the first type light-emitting element (EDB) and the second type light-emitting element (EDG) have lower luminous efficiency as the size of the light-emitting element (ED) decreases. However, it can be seen that the relative relationship between the luminous efficiency of the first type light-emitting element (EDB) and the second type light-emitting element (EDG) according to the size of the light-emitting element (ED) differs based on the size of the light-emitting element (ED) being 10 μm.

[0204] Specifically, when the size of the light-emitting element (ED) is greater than 10 μm, the luminous efficiency of the first type light-emitting element (EDB) emitting third color light may be greater than the luminous efficiency of the second type light-emitting element (EDG) emitting second color light. Conversely, when the size of the light-emitting element (ED) is less than or equal to 10 μm, the luminous efficiency of the first type light-emitting element (EDB) emitting third color light may be smaller than the luminous efficiency of the second type light-emitting element (EDG) emitting second color light. That is, as the size of the light-emitting element (ED) decreases, the luminous efficiency of the light-emitting element (ED) also decreases; however, when the size of the light-emitting element (ED) is 10 μm or less based on the size of the light-emitting element (ED), the luminous efficiency of the second type light-emitting element (EDG) emitting second color light is greater than the luminous efficiency of the first type light-emitting element (EDB) emitting third color light. In addition, when the size of the light-emitting element (ED) is 1 μm, the luminous efficiency of the first type light-emitting element (EDB) emitting third color light is in the range of 2% to 3%, and the luminous efficiency of the second type light-emitting element (EDG) emitting second color light is in the range of 4.5% to 5%, so the luminous efficiency can be about twice.

[0205] Accordingly, when the peak wavelength band of the color displayed in each subpixel (SPX) is greater than or equal to the peak wavelength of the second color light, the efficiency of the light emitted from the light-emitting element layer (EML) can be improved by placing a second type light-emitting element (EDG) that emits the second color light in the corresponding subpixel (SPX). In addition, since the peak wavelength band of the light emitted by the second type light-emitting element (EDG) is greater than the peak wavelength band of the light emitted by the first type light-emitting element (EDB), the operating voltage of the light emission can be relatively small. Therefore, as in the present embodiment, by placing a second type light-emitting element (EDG) that emits green or cyan light in the subpixel displaying at least red, and placing a first type light-emitting element (EDB) that emits blue light in the subpixel displaying blue, the display device (10) can have improved reliability and high light-emitting efficiency.

[0206] Other embodiments are described below. In the following embodiments, redundant descriptions of configurations identical to those previously described are omitted or simplified, and the differences are described primarily.

[0207] FIG. 10 is a cross-sectional view of a display device according to another embodiment.

[0208] Referring to FIG. 10, the display device (10_1) according to the present embodiment differs from the display device (10) of FIG. 3 in that the color control layer (WCL, TPL1) and the color filter layer (CF) are not sequentially formed on the light-emitting element layer (EML) but are formed on a separate second substrate (SUB2), and further include a substrate layer (AD) disposed between the first substrate (SUB1) and the second substrate (SUB2).

[0209] Specifically, the display device (10_1) according to the present embodiment may include a first display substrate including a first substrate (SUB1), a second display substrate including a second substrate (SUB2) facing the first display substrate, and a sealing member (AD) disposed between the first display substrate and the second display substrate.

[0210] The first display substrate may include a first substrate (SUB1), a circuit layer (CCL) disposed on the first substrate (SUB1), a light-emitting element layer (EML) disposed on the circuit layer (CCL), and a first protective layer (PAS1) disposed on the light-emitting element layer (EML). Since the first substrate (SUB1), circuit layer (CCL), light-emitting element layer (EML), and first protective layer (PAS1) included in the first display substrate overlap with the description of each component of the display device (10) described above with reference to FIG. 3, a detailed description thereof will be omitted.

[0211] A second display substrate may be disposed facing the first protective layer (PAS1) of a first display substrate. The second display substrate may include a second substrate (SUB2), a second light-blocking member (BK2) disposed on one side of the second substrate (SUB2) facing the first substrate (SUB1), a color filter layer (CF), a first light-blocking member (BK1), a color control layer (WCL, TPL1), and a first capping layer (CAP1).

[0212] The second substrate (SUB2) may include a transparent material. The second substrate (SUB2) may include a transparent insulating material such as glass or quartz. The second substrate (SUB2) may be the same substrate as the first substrate (SUB1), but the material, thickness, transmittance, etc., may be different. For example, the second substrate (SUB2) may have a higher transmittance than the first substrate (SUB1). The second substrate (SUB2) may be thicker than the first substrate (SUB1) or thinner.

[0213] The second light-blocking member (BK2) may be disposed on one side of the second substrate (SUB2) facing the first substrate (SUB1). The second light-blocking member (BK2) overlaps the second bank (600) of the first display substrate in the third direction (DR3) and may be disposed in a light-blocking area (BA) on one side of the second substrate (SUB2).

[0214] A color filter layer (CF) may be disposed on one side of a second substrate (SUB2) on which a second light-blocking member (BK2) is disposed. The color filter layer (CF) may be disposed on one side of the second substrate (SUB2) exposed by the second light-blocking member (BK2). Furthermore, the color filter layer (CF) may also be partially disposed on an adjacent second light-blocking member (BK2). Although the drawing illustrates a case where adjacent color filter layers (CF) are disposed spaced apart from each other on the second light-blocking member (BK2), adjacent color filter layers (CF) may overlap at least partially on the second light-blocking member (BK2).

[0215] The third capping layer (CAP3) may be placed on the color filter layer (CF). The third capping layer (CAP3) may also be placed on the second light-blocking member (BK2) exposed by the color filter layer (CF). The third capping layer (CAP3) may be in direct contact with one side of the color filter layer (CF) (the bottom side in FIG. 10). The third capping layer (CAP3) can prevent impurities, such as moisture or air, from penetrating from the outside and damaging or contaminating the color filter layer (CF).

[0216] The first light-blocking member (BK1) may be placed on the third capping layer (CAP3). The first light-blocking member (BK1) may overlap the second light-blocking member (BK2) and the second bank (600) in the third direction (DR3) and be placed in the light-blocking area (BA). The first light-blocking member (BK1) may include an opening that exposes the color filter layer (CF).

[0217] The color control layer (WCL, TPL1) may be placed within the space exposed by the opening of the first light-blocking member (BK1). The color control layer (WCL, TPL1) may be placed in the light-emitting area (TA: TA1, TA2, TA3).

[0218] The first capping layer (CAP1) may be placed on the color control layer (SCL, TPL1). The first capping layer (CAP1) may also be placed on the first light-blocking member (BK1). The first capping layer (CAP1) may be in direct contact with one side (the bottom side in FIG. 10) of the color control layer (SCL, TPL1). The first capping layer (CAP1) can prevent impurities, such as moisture or air, from penetrating from the outside and damaging or contaminating the color control layer (SCL, TPL1).

[0219] A substrate layer (AD) may be disposed between a first display substrate and a second display substrate. Specifically, the substrate layer (AD) may be disposed between a first protective layer (PAS1) disposed on the light-emitting element layer (EML) of the first display substrate and a first capping layer (CAP1) disposed on the color control layer (WCL, TPL1) of the second display substrate. The substrate layer (AD) may fill the space between the first display substrate and the second display substrate while also serving to bond them together. The substrate layer (AD) may be composed of Si-based organic materials, epoxy-based organic materials, etc., but is not limited thereto.

[0220] FIG. 11 is a cross-sectional view of a display device according to another embodiment.

[0221] Referring to FIG. 11, the display device (10_2) according to the present embodiment differs from the display device (10) of FIG. 3 in that the color control layer (WCL, TPL1) is formed on the first substrate (SUB1) and sequentially formed on the light-emitting element layer (EML), while the color filter layer (CF) is not formed sequentially on the light-emitting element layer (EML) but is formed on a separate second substrate (SUB2).

[0222] Specifically, the first display substrate of the display device (10_2) according to the present embodiment may include a first substrate (SUB1), a circuit layer (CCL) disposed on the first substrate (SUB1), a light-emitting element layer (EML) disposed on the circuit layer (CCL), a first protective layer (PAS1) disposed on the light-emitting element layer (EML), a first flattening layer (OC1) disposed on the first protective layer (PAS1), a first capping layer (CAP1), a first light-blocking member (BK1), a color control layer (WCL, TPL1), and a second capping layer (CAP2). The first substrate (SUB1), circuit layer (CCL), light-emitting element layer (EML), first protective layer (PAS1), first flattening layer (OC1), first capping layer (CAP1), first light-blocking member (BK1), color control layer (WCL, TPL1), and second capping layer (CAP2) included in the first display substrate overlap with the description of each component of the display device (10) described above with reference to FIG. 3, so a detailed description thereof will be omitted.

[0223] A second display substrate may be disposed opposite to the second capping layer (CAP2) of a first display substrate on the upper side thereof. The second display substrate may include a second substrate (SUB2), a second light-blocking member (BK2) disposed on one surface of the second substrate (SUB2) opposite to the first substrate (SUB1), a color filter layer (CF), and a third capping layer (CAP3).

[0224] The second substrate (SUB2) may include a transparent material. The second light-blocking member (BK2) may be disposed on one side of the second substrate (SUB2) facing the first substrate (SUB1). The second light-blocking member (BK2) overlaps the second bank (600) of the first display substrate in the third direction (DR3) and may be disposed in a light-blocking area (BA) on one side of the second substrate (SUB2).

[0225] A color filter layer (CF) may be disposed on one side of a second substrate (SUB2) on which a second light-blocking member (BK2) is disposed. A color filter layer (CF) may be disposed on one side of the second substrate (SUB2) exposed by the second light-blocking member (BK2).

[0226] The third capping layer (CAP3) may be disposed on the color filter layer (CF). The third capping layer (CAP3) may also be disposed on the second light-blocking member (BK2) exposed by the color filter layer (CF).

[0227] A substrate layer (AD) may be disposed between a first display substrate and a second display substrate. Specifically, the substrate layer (AD) may be disposed between a second capping layer (CAP2) disposed on a color control layer (WCL, TPL1) of the first display substrate and a second capping layer (CAP2) disposed on a color filter layer (CF) of the second display substrate.

[0228] FIG. 12 is a cross-sectional view of a display device according to another embodiment.

[0229] Referring to FIG. 12, the display device (10_3) according to the present embodiment differs from the display device (10) of FIG. 3 in that the color control layer (WCL, TPL1) is placed in a space partitioned by the second bank (600), the color control layer (WCL, TPL1) and the light-emitting element layer (EML) are located at the same level, and the first light-blocking member (BK1), the flattening layer (OC1), and the second capping layer (CAP2) are omitted.

[0230] Specifically, the color control layer (WCL, TPL1) of the display device (10_3) according to the present embodiment may be disposed in an opening that exposes the first bank (400) and a plurality of light-emitting elements (ED) by including a second bank (600) of the light-emitting element layer (EML). As described above, the second bank (600) is disposed at the boundary of each sub-pixel (SPX: SPX1, SPX2, SPX3) to distinguish neighboring sub-pixels (SPX), and in the inkjet printing process used in the process of disposing of a plurality of light-emitting elements (ED), it prevents ink from overflowing into adjacent sub-pixels (SPX), and at the same time, it can also serve to partition the area where the color control layer (WCL, TPL1) is disposed.

[0231] The color control layer (WCL, TPL1) may be disposed on a plurality of light-emitting elements (ED: EDG1, EDB1, EDB2), first and second contact electrodes (710, 720) and a plurality of insulating layers within an opening partitioned by the second bank (600).

[0232] The first capping layer (CAP1) can be placed on the color control layer (WCL, TPL1) and the second bank (600). The first capping layer (CAP1) can be placed to cover the color control layer (WCL, TPL1) and the second bank (600). The first capping layer (CAP1) can prevent impurities such as moisture or air from penetrating from the outside and contaminating the light-emitting element layer (EML) and the color control layer (WCL, TPL1).

[0233] The second flattening layer (OC2) can be placed on the first capping layer (CAP1). The second flattening layer (OC2) can be placed on the first capping layer (CAP1) and serve to flatten the step formed by the color control layer (WCL, TPL1) and the second bank (600).

[0234] The second light-blocking member (BK2) can be placed on the second flattening layer (OC2).

[0235] A color filter layer (CF) may be disposed on the second flattening layer (OC2). The color filter layer (CF) may be disposed on one side of the second flattening layer (OC2) in an area partitioned by the second light-blocking member (BK2).

[0236] The third capping layer (CAP3) can be placed on the color filter layer (CF) and the second light-blocking member (BK2) to cover them. The third capping layer (CAP3) can serve to protect the color filter layer (CF).

[0237] The encapsulation layer (ENC) can be placed on the third capping layer (CAP3).

[0238] FIG. 13 is a cross-sectional view of a display device according to another embodiment.

[0239] Referring to FIG. 13, the display device (10_4) according to the present embodiment differs from the display device (10) of FIG. 3 in that the second light-blocking member (BK2) is omitted, a color pattern (CF3_2) containing the same color material as the third color filter (CF3_1) is further disposed in the light-blocking area (BA), and a third flattening layer (OC3) is further disposed between the color filter layer (CF) and the encapsulation layer (ENC).

[0240] Specifically, the display device (10_4) according to the present embodiment may include a third color filter (CF3_1) disposed in the third light-emitting region (TA3) of the third subpixel (SPX3) on the second capping layer (CAP2), and a color pattern (CF3_2) disposed in the light-blocking region (BA). The color pattern (CF3_2) may be disposed in the light-blocking region (BA) in the boundary region between adjacent subpixels (SPX1, SPX2, SPX3). The color pattern (CF3_2) disposed in the region adjacent to the third light-emitting region (TA3) may be formed integrally with the third color pattern (CF3_1).

[0241] The first and second color filters (CF1, CF2) included in the first and second subpixels (SPX1, SPX2) may be placed on the second capping layer (CAP2) within an area partitioned by the color pattern (CF3_2). The first and second color filters (CF1, CF2) may also be partially placed on the color pattern (CF3_2). Meanwhile, although the drawings show the first and second color filters (CF1, CF2) spaced apart from each other on the color pattern (CF3_2), they are not limited thereto. For example, the first and second color filters (CF1, CF2) may be placed overlappingly in the third direction (DR3) in the light-blocking area (BA).

[0242] The third capping layer (CAP3) can be placed on the color filter layer (CF).

[0243] The third flattening layer (OC3) may be disposed on top of the color filter layer (CF). The third flattening layer (OC3) may be disposed on the third capping layer (CAP3). The third flattening layer (OC3) may serve to flatten the step difference on top of the color filter layer (CF). The third flattening layer (OC3) may include an organic material. For example, the third flattening layer (OC3) may include at least one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin.

[0244] The encapsulation layer (ENC) can be placed on the third flattening layer (OC3).

[0245] FIG. 14 is a cross-sectional view of a display device according to another embodiment.

[0246] Referring to FIG. 14, the display device (10_5) according to the present embodiment differs from the display device (10) of FIG. 3 in that it includes a second light-emitting element (EDG2) that emits second color light rather than third color light to a second subpixel (SPX2), and a second light transmission pattern (TPL2) that maintains and passes the wavelength of light incident on a color control layer (WCL1, TPL).

[0247] Specifically, the light-emitting elements (ED_1: EDG1, EDG2, EDB2) placed in each subpixel (SPX: SPX1, SPX2, SPX3) of the display device (10_5) according to the present embodiment may include first to third light-emitting elements (ED_1: EDG1, EDG2, EDB2) that emit different colors. Among the light-emitting elements (ED_1: EDG1, EDG2, EDB2) placed in each subpixel (SPX: SPX1, SPX2, SPX3), the first light-emitting element (EDG1) placed in the first subpixel (SPX1) that emits a first color light to the outside of the display device (10_5) and the second light-emitting element (EDG2) placed in the second subpixel (SPX2) that emits a second color light to the outside of the display device (10_5) can emit a second color light, and the third light-emitting element (EDB2) placed in the third subpixel (SPX3) that emits a third color light to the outside of the display device (10_5) can emit a third color light. That is, among the light-emitting elements (ED_1: EDG1, EDG2, EDB2) placed in each subpixel (SPX: SPX1, SPX2, SPX3), the first and second light-emitting elements (EDG1, EDG2) placed in the first and second subpixels (SPX1, SPX2), which emit red and green light respectively to the outside of the display device (10_5), can emit green light or cyan light. For example, the first light-emitting element (EDG1) placed in the first subpixel (SPX1) emits green light or cyan light of the second color, the second light-emitting element (EDG2) placed in the second subpixel (SPX2) emits green light or cyan light of the second color, and the third light-emitting element (EDB2) placed in the third subpixel (SPX3) can emit blue light of the third color.

[0248] A color control layer (WCL1, TPL) disposed in each subpixel (SPX: SPX1, SPX2, SPX3) of a display device (10_5) according to the present embodiment may include a first wavelength conversion pattern (WCL1) and a light transmission pattern (TPL). The light transmission pattern (TPL) may include a first light transmission pattern (TPL1) and a second light transmission pattern (TPL2).

[0249] The first wavelength conversion pattern (WCL1) may be placed within the first light emission region (TA1) in the first subpixel (SPX1). The second light transmission pattern (TPL2) may be placed within the second light emission region (TA2) in the second subpixel (SPX2). The first light transmission pattern (TPL1) may be placed within the third light emission region (TA3) in the third subpixel (SPX3).

[0250] As a second light-emitting element (EDG2) emitting second color light is disposed in the second subpixel (SPX2), there may be no need to convert the wavelength of the light emitted from the light-emitting element layer (EML). Accordingly, the second subpixel (SPX2) may include a second light transmission pattern (TPL2), and the second light transmission pattern (TPL2) may emit light of the wavelength of the second color incident from the light-emitting element layer (EML) while maintaining its wavelength. For example, the second light transmission pattern (TPL2) may transmit the second color light, green light, or cyan light incident from the light-emitting element layer (EML) while maintaining its wavelength. However, it is not limited thereto, and if the second subpixel (SPX2) includes a second light-emitting element (EDG2) emitting cyan light, the second subpixel (SPX2) may include a wavelength conversion pattern that converts the cyan light into green light and emits it.

[0251] For example, the first and second light-emitting elements (EDG1, EDG2) placed in the first light-emitting area (TA1) of the first subpixel (SPX1) and the second light-emitting area (TA2) of the second subpixel (SPX2) can each emit second color light, green light, or cyan light having a peak wavelength in the range of 480 nm to 575 nm. Additionally, the third light-emitting element (EDB2) placed in the third light-emitting area (TA3) of the third subpixel (SPX3) can emit third color light or blue light having a peak wavelength in the range of 445 nm to 475 nm. Accordingly, among the light emitted from the light-emitting element layer (EML), the light emitted from the first and second subpixels (SPX1, SPX2) emits second color light, green light, or cyan light, and the light emitted from the third subpixel (SPX3) can emit third color light or blue light.

[0252] As described above, as the size (or length in the extension direction) of the light-emitting element (ED) decreases, the light-emitting element (EDG: EDG1, EDG2) emitting second color light may have a higher light-emitting efficiency than the light-emitting element (EDB2) emitting third color light. That is, as the size (or length in the extension direction) of the light-emitting element (ED) decreases, the second type light-emitting element (EDG) emitting green light or cyan light may have a higher light-emitting efficiency than the first type light-emitting element (EDB) emitting blue light. Accordingly, by placing a second type light-emitting element emitting second color light in a subpixel that displays a color that is represented by light having a peak wavelength longer than the peak wavelength of light representing the third color, such as in the display device (10_5) according to the present embodiment, for example, a first and second subpixel (SPX1, SPX2), the light-emitting efficiency of the light-emitting element layer (EML) of the display device (10_5) can be improved.

[0253] FIG. 15 is a planar arrangement of light-emitting element layers according to another embodiment.

[0254] Referring to FIG. 15, the light-emitting element layer according to one embodiment may include a larger number of light-emitting elements per unit area, such that each subpixel (SPX: SPX1, SPX2, SPX3) includes a larger number of electrodes. Additionally, the light-emitting elements included in the light-emitting element layer according to the present embodiment may include first and second sub-light-emitting elements connected in series with each other.

[0255] Hereinafter, the planar structure of the electrodes (210, 220, 230), the first light-emitting element (EDG1), and the contact electrodes (710, 720, 730) disposed in the first subpixel (SPX1) will be described in detail, and the planar structure of the second and third subpixels (SPX2, SPX3) will be replaced by the description of the first subpixel (SPX1). This embodiment differs from the embodiment of FIG. 4 in that the arrangement structure of the electrodes (210, 220, 230) and the first light-emitting elements (EDG) disposed in the first subpixel (SPX1) is different. Hereinafter, redundant content will be omitted and the differences will be described in detail.

[0256] Specifically, the electrode layer (210, 220, 230) may include a first electrode (210), a second electrode (220), and a third electrode (230). The third electrode (230) may be disposed between the first electrode (210) and the second electrode (220).

[0257] The first light-emitting element (EDG1) may include a first sub-light-emitting element (EDG1_1) and a second sub-light-emitting element (EDG1_2). The first sub-light-emitting element (EDG1_1) may be placed on the first electrode (210) and the third electrode (230) such that both ends are placed on the first electrode (210) and the third electrode (230). The second sub-light-emitting element (EDG1_2) may be placed on the third electrode (230) and the second electrode (220) such that both ends are placed on the third electrode (230) and the second electrode (220).

[0258] The contact electrodes (710, 720, 730) may include a first contact electrode (710), a second contact electrode (720), and a third contact electrode (730). The first contact electrode (710) may be placed on the first electrode (210), the second contact electrode (720) may be placed on the second electrode (220), and the third contact electrode (730) may be placed on the third electrode (230).

[0259] The first contact electrode (710) can be in contact with one end of the first sub-luminescent element (EDG1_1) and the first electrode (210) exposed by the opening (OP) of the first insulating layer (510, see FIG. 5). The third contact electrode (730) can be in contact with the other end of the first sub-luminescent element (EDG1_1) and one end of the second sub-luminescent element (EDG1_2). The first insulating layer (510) is interposed between the third contact electrode (730) and the third electrode (230) so that they can be electrically insulated from each other. The second contact electrode (720) can be in contact with the other end of the second sub-luminescent element (EDG1_2) and the second electrode (220) exposed by the opening (OP) of the first insulating layer (510, see FIG. 5).

[0260] An electrical signal for the light emission of the light-emitting element (EDG) is applied directly only to the first electrode (210) or the second electrode (220), respectively, and the first sub-light-emitting element (EDG1_1) and the second sub-light-emitting element (EDG1_2) can be connected through the third contact electrode (730). Accordingly, the first sub-light-emitting element (EDG1_1) and the second sub-light-emitting element (EDG1_2) can be connected in series with each other through the third contact electrode (730).

[0261] Each subpixel (SPX) is arranged in two rows and includes a first sub-emissive element (EDG1_1) and a second sub-emissive element (EDG1_2) connected in series with each other, so that the brightness per unit area can be improved. In the embodiment of FIG. 15, the first sub-emissive element (EDG1_1) and the second sub-emissive element (EDG1_2) are shown arranged in two rows, but are not limited thereto. For example, the first sub-emissive element (EDG1_1) and the second sub-emissive element (EDG1_2) may be arranged in a second direction (DR2) with each other in one row, and may be connected in series with each other depending on the structure of each electrode.

[0262] FIG. 16 is a planar arrangement of light-emitting element layers according to another embodiment.

[0263] Referring to FIG. 16, the display device according to the present embodiment differs from the embodiment of FIG. 15 in that the first and second sub-light-emitting elements (EDG1_1, EDG1_2) connected in series with each other are arranged in the same row, the third electrode (230) is omitted, and the planar shape of the third contact electrode (730) has a folded shape.

[0264] Specifically, a first sub-light-emitting element (EDG1_1) and a second sub-light-emitting element (EDG1_2) connected in series with each other may be placed on the first electrode (210) and the second electrode (220), respectively, such that both ends are placed on the first electrode (210) and the second electrode (220). The first sub-light-emitting element (EDG1_1) may be placed on the upper side of the plane and the second sub-light-emitting element (EDG1_2) may be placed on the lower side of the plane.

[0265] The contact electrodes (710, 720, 730) may include a first contact electrode (710), a second contact electrode (720), and a third contact electrode (730).

[0266] The first contact electrode (710) is placed on the first electrode (210), but may be placed on the upper side of the plane. The length of the first contact electrode (710) in the second direction (DR2) may be shorter than the length of the first contact electrode (710) in the second direction (DR2) according to the embodiment of FIG. 15.

[0267] The second contact electrode (720) may be placed on the second electrode (220) and may be placed on the lower side of the plane. The length of the second contact electrode (720) in the second direction (DR2) may be shorter than the length of the second contact electrode (720) in the second direction (DR2) according to the embodiment of FIG. 15. The first contact electrode (710) and the second contact electrode (720) may not overlap each other in the first direction (DR1) and / or the second direction (DR2).

[0268] The third contact electrode (730) may include a first portion disposed on the second electrode (220) and positioned above the planar second contact electrode (720), a second portion disposed on the first electrode (210) and positioned below the planar first contact electrode (710), and a third portion connecting the first portion and the second portion. That is, the third contact electrode (730) may have a planar bent shape.

[0269] The first contact electrode (710) can be in contact with one end of the first sub-luminescent element (EDG1_1) and the first electrode (210) exposed by the opening (OP) of the first insulating layer (510, see FIG. 5). The third contact electrode (730) can be in contact with the other end of the first sub-luminescent element (EDG1_1) and one end of the second sub-luminescent element (EDG1_2). Specifically, the first part of the third contact electrode (730) can be in contact with the other end of the first sub-luminescent element (EDG1_1), and the second part of the third contact electrode (730) can be in contact with one end of the second sub-luminescent element (EDG1_1). The first insulating layer (510) is interposed between the third contact electrode (730) and the third electrode (230) so that they can be electrically insulated from each other. The second contact electrode (720) can contact the other end of the second sub-luminescent element (EDG1_2) and the second electrode (220) that is exposed by the opening (OP) of the first insulating layer (510, see FIG. 5).

[0270] An electrical signal for the light emission of the light-emitting element (EDG) is applied directly only to the first electrode (210) or the second electrode (220), respectively, and the first sub-light-emitting element (EDG1_1) and the second sub-light-emitting element (EDG1_2) can be connected through the third contact electrode (730). Accordingly, the first sub-light-emitting element (EDG1_1) and the second sub-light-emitting element (EDG1_2) can be connected in series with each other through the third contact electrode (730).

[0271] Each subpixel (SPX) is arranged in a single row and includes a first sub-emissive element (EDG1_1) and a second sub-emissive element (EDG1_2) connected in series with each other, so that the brightness per unit area can be improved. In the embodiment of FIG. 16, the first sub-emissive element (EDG1_1) and the second sub-emissive element (EDG1_2) are shown arranged in a single row, but are not limited thereto.

[0272] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing the technical concept or essential features thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0273] 10: Display device SUB1: 1st substrate EDG1: First light-emitting element EDB1: Second light-emitting element EDB2: Third light-emitting element EDB: Type 1 light-emitting device EDG: Type 2 light-emitting diode WCL: Wavelength conversion layer WCL1: First wavelength conversion pattern WCL2 2nd wavelength conversion pattern TPL1: First light transmission pattern BK1: First light-blocking member BK2: Second light-blocking member

Claims

Claim 1 A first substrate comprising a plurality of subpixels; a plurality of first electrodes and a plurality of second electrodes spaced apart from each other and disposed on each of the plurality of subpixels on the first substrate; a plurality of light-emitting elements provided for each subpixel, with both ends disposed to be placed on the first electrode and the second electrode, respectively. and a color control layer disposed on the plurality of light-emitting elements and provided for each of the plurality of subpixels, wherein the plurality of subpixels includes a first subpixel representing a first color, a second subpixel representing a second color different from the first color, and a third subpixel representing a third color, and the plurality of light-emitting elements include a first light-emitting element disposed on the first subpixel and emitting the third color light, a second light-emitting element disposed on the second subpixel and emitting the second color light, and a third light-emitting element disposed on the third subpixel and emitting the second color light, wherein the third color is green or cyan and is different from the first color and the second color, and the second color is blue, and the second color light of the second light-emitting element is in the same wavelength band as the second color light of the third light-emitting element, and the second color light of the second light-emitting element and the second color light of the third light-emitting element are of the same color, and disposed on the first substrate and disposed on each of the plurality of subpixels A display device comprising a first bank including a first sub-bank and a second sub-bank spaced apart from each other, and further comprising a second bank disposed on the first substrate and disposed along the boundary of the plurality of sub-pixels and having a height greater than that of the first bank, wherein the plurality of first electrodes are disposed overlappingly on the first sub-bank and the plurality of second electrodes are disposed overlappingly on the second sub-bank. Claim 2 A display device according to claim 1, wherein the light-emitting element has a phenomenon of being extended in one direction, and the length of the light-emitting element in the one direction has a range of 500 nm to 10 µm. Claim 3 A display device according to claim 1, wherein the first color is red. Claim 4 A display device according to claim 3, wherein the color control layer comprises a first wavelength conversion pattern disposed in the first subpixel and converting the third color light into the first color, and a first light transmission pattern disposed in the second subpixel and transmitting the second color light. Claim 5 delete Claim 6 In claim 4, the color control layer further comprises a second wavelength conversion pattern disposed in the third subpixel and converting the second color light into the third color. Claim 7 A display device according to claim 4, wherein the plurality of subpixels further include a third subpixel representing the third color, and the plurality of light-emitting elements further include a third light-emitting element disposed in the third subpixel and emitting light of the third color. Claim 8 In claim 7, the color control layer further comprises a second light transmission pattern disposed in the third subpixel and transmitting the third color light. Claim 9 A display device according to claim 4, further comprising a color filter layer including a first color filter disposed on the first wavelength conversion pattern and a second color filter disposed on the first light transmission pattern. Claim 10 A display device according to claim 1, wherein the third color light emitted by the first light-emitting element has a peak wavelength in the range of 480 nm to 575 nm, and the second color light emitted by the second light-emitting element has a peak wavelength in the range of 445 nm to 475 nm. Claim 11 A first substrate comprising a plurality of subpixels; a plurality of first electrodes and a plurality of second electrodes spaced apart from each other on the first substrate; a plurality of light-emitting elements having a phenomenon of extending in one direction, wherein both ends are arranged to be placed on the first electrode and the second electrode of each subpixel, respectively; The apparatus comprises a color control layer disposed on the plurality of light-emitting elements and provided for each of the subpixels, wherein the plurality of subpixels includes a first subpixel representing a first color, a second subpixel representing a second color different from the first color, and a third subpixel representing a third color, wherein the length of the light-emitting element in one direction has a range of 500 nm to 10 µm, and the plurality of light-emitting elements include a first light-emitting element disposed on the first subpixel and emitting the third color light, a second light-emitting element disposed on the second subpixel and emitting the second color light, and a third light-emitting element disposed on the third subpixel and emitting the second color light, wherein the third color is green or cyan and is different from the first color, and the second color is blue, and the second color light of the second light-emitting element is in the same wavelength band as the second color light of the third light-emitting element, and the second color light of the second light-emitting element and the second color light of the third light-emitting element are the same A display device comprising a color, a first bank including a first sub-bank and a second sub-bank spaced apart from each other and disposed on the first substrate and disposed on each of the plurality of sub-pixels, and further comprising a second bank disposed on the first substrate and disposed along the boundary of the plurality of sub-pixels and having a height greater than that of the first bank, wherein the plurality of first electrodes are superimposed on the first sub-bank and the plurality of second electrodes are superimposed on the second sub-bank. Claim 12 In claim 11, the third color is a display device different from the second color. Claim 13 In claim 12, the display device in which the first color is red. Claim 14 delete Claim 15 In claim 13, the color control layer comprises a first wavelength conversion pattern disposed in the first subpixel and converting the third color light into the first color, a first light transmission pattern disposed in the second subpixel and transmitting the second color light, and a second wavelength conversion pattern disposed in the third subpixel and converting the second color light into the third color. Claim 16 A display device according to claim 12, wherein the third color light emitted by the first light-emitting element has a peak wavelength in the range of 480 nm to 575 nm, and the second color light emitted by the second light-emitting element has a peak wavelength in the range of 445 nm to 475 nm. Claim 17 In claim 11, the third color is the same display device as the second color. Claim 18 A display device according to claim 12, wherein the first color is red, and the second color and the third color are green or cyan. Claim 19 A display device according to claim 18, wherein the plurality of subpixels further include a third subpixel representing a fourth color, and the plurality of light-emitting elements further include a third light-emitting element disposed in the third subpixel and emitting the fourth color light, and the fourth color is blue. Claim 20 In claim 19, the color control layer comprises a first wavelength conversion pattern disposed in the first subpixel and converting the third color light into the first color, a first light transmission pattern disposed in the second subpixel and transmitting the second color light, and a second light transmission pattern disposed in the third subpixel and transmitting the fourth color light.

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