Display apparatus and method of manufacturing the same

Abstract

A display device according to one embodiment of the present invention may include: a display element layer comprising a plurality of light-emitting elements arranged along one direction, each providing source light and divided into first to third light-emitting regions corresponding to each of the light-emitting elements and a non-light-emitting region surrounding the first to third light-emitting regions; a light control unit disposed on the display element layer and having openings defined that overlap each of the first and second light-emitting regions, and comprising a base resin and a scatterer; light conversion units disposed on each of the openings and comprising quantum dots; and first to third color filters disposed on the light control unit and the light conversion units and overlapping each of the first to third light-emitting regions. The light control unit may include a first portion that overlaps the non-light-emitting region; and a second portion that overlaps the third light-emitting region, forms a step with the first portion, and is composed of the same material as the first portion, wherein the width of the first portion may be greater than the thickness of the second portion.

Description

Technology Field

[0001] The present invention relates to a display device and a method for manufacturing the same, and more specifically, to a display device with improved reliability. Background Technology

[0002] Multimedia display devices such as televisions, mobile phones, tablets, computers, navigation systems, and game consoles may be equipped with a display panel for displaying images. The display panel may include a plurality of pixels for displaying images, and each pixel may include a light-emitting element that generates light and a driving element connected to the light-emitting element.

[0003] To improve the light emission efficiency and color purity of a display device, the display device may include an optical functional layer containing scatterers. However, defects in the display device may occur due to the uneven formation of the density of scatterers dispersed within the optical functional layer, and research is required to resolve this issue. The problem to be solved

[0004] The objective of the present invention is to provide a display device with improved reliability and prevents defects in which stains are visible by uniformly forming the density of scatterers within a light control unit that transmits source light provided from a light-emitting element. means of solving the problem

[0005] One embodiment provides a display device comprising: a plurality of light-emitting elements each providing source light and arranged along one direction, and a display element layer divided into first to third light-emitting regions corresponding to each of the light-emitting elements and a non-light-emitting region surrounding the first to third light-emitting regions; a light control unit disposed on the display element layer and having openings defined that overlap each of the first and second light-emitting regions, and including a base resin and a scatterer; light conversion units disposed on each of the openings and including quantum dots; and first to third color filters disposed on the light control unit and the light conversion units and overlapping each of the first to third light-emitting regions. The light control unit includes a first portion that overlaps the non-light-emitting region; and a second portion that overlaps the third light-emitting region, is composed of the same material as the first portion, and forms a step difference with the first portion, wherein the width of the first portion in the one direction may be greater than the thickness of the second portion.

[0006] The width of the first part may correspond to the gap between one end of the first part defining an opening arranged adjacent to the second part on a plane and the other end of the first part forming the step.

[0007] The thickness of the second part may be smaller than the thickness of each of the light conversion parts.

[0008] The difference between the width of the first part and the thickness of the second part may be 6㎛ or more.

[0009] Each of the first part and the second part includes a first surface facing the display element layer, and in the thickness direction, the first surface of the second part may be further spaced from the display element layer than the first surface of the first part.

[0010] The first part above can surround the second part on a plane.

[0011] The light control unit can surround the light conversion units on a plane.

[0012] At least two of the first to third color filters can overlap each other in the non-luminous region.

[0013] The first to third color filters mentioned above may have different colors from each other.

[0014] The light conversion units include a first light conversion unit that overlaps the first light emission region and includes a first quantum dot that converts the source light into a first light; and a second light conversion unit that overlaps the second light emission region and includes a second quantum dot that converts the source light into a second light different from the first light, wherein the first light conversion unit overlaps the first color filter, the second light conversion unit overlaps the second color filter, and the light control unit can overlap the third color filter.

[0015] At least one of the first light conversion unit and the second light conversion unit may further include a scatterer.

[0016] The above display device may further include a low-refractive index layer disposed between the first to third color filters and the light control unit and covering the first to third color filters.

[0017] One embodiment provides a display device comprising: a display element layer including first to third light-emitting elements, each providing source light; a light control unit disposed on the display element layer, wherein openings overlapping the first and second light-emitting elements and a recess overlapping the third light-emitting element are defined, and the light control unit includes a base resin and a scatterer; light conversion units disposed in the openings and including quantum dots; and first to third color filters overlapping the first to third light-emitting elements, wherein the distance between the recess and the opening adjacent to the recess is greater than the thickness of the portion in the light control unit where the recess is defined.

[0018] The difference between the above distance and the above thickness may be 6㎛ or more.

[0019] The above-mentioned depression can be superimposed on the above-mentioned third color filter.

[0020] The light control unit can surround the light conversion units on a plane.

[0021] Within the area between the above-mentioned depression and the above-mentioned opening, at least two of the first to third color filters can overlap each other.

[0022] One embodiment provides a method for manufacturing a display device comprising the steps of: providing a substrate; forming color filters on the substrate; forming a preliminary light control unit comprising a base resin and a scatterer on the color filters; providing a mask comprising a mask opening, a light-blocking portion, and a semi-transparent portion on the preliminary light control unit to form a light control unit having an opening and a recess; forming a light conversion unit in the opening; and providing a display panel comprising a plurality of light-emitting elements on the light control unit, wherein the opening and the recess are each superimposed on the plurality of light-emitting elements.

[0023] The above opening and the above recess may be formed corresponding to the mask opening and the above translucent portion, respectively.

[0024] The above light conversion unit can be formed through an inkjet printing process. Effects of the invention

[0025] The light control unit of one embodiment of the present invention can be formed as a single light control unit that overlaps the light-emitting region and the non-light-emitting region by the same photolithography process, thereby allowing the density of scatterers dispersed within the light control unit to be formed uniformly.

[0026] In one embodiment of the present invention, the light control unit is formed such that the thickness of the light control unit overlapping the light-emitting region is thinner than the width of the light control unit overlapping the non-light-emitting region, thereby preventing color mixing within the non-light-emitting region and simultaneously providing a light control unit with a uniform density of scatterers.

[0027] A display device including a light control unit of one embodiment of the present invention can prevent the problem of stains being visible within a display area due to non-uniformity of scatterer density and can have improved reliability. Brief explanation of the drawing

[0028] FIG. 1 is a perspective view of a display device according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of a display device according to one embodiment of the present invention. FIG. 3 is a cross-sectional view of a display module according to one embodiment of the present invention. FIG. 4 is a plan view of a display panel according to one embodiment of the present invention. FIG. 5 is an enlarged plan view of a display module according to one embodiment of the present invention. FIG. 6 is an enlarged plan view of a light conversion layer according to one embodiment of the present invention. FIG. 7a is a cross-sectional view of a display module according to one embodiment of the present invention. FIG. 7b is a cross-sectional view of a display module according to one embodiment of the present invention. FIG. 8 is a flowchart of a method for manufacturing a display device according to one embodiment of the present invention. FIGS. 9a to 9f are cross-sectional views illustrating one step of a method for manufacturing a display device according to one embodiment of the present invention. Specific details for implementing the invention

[0029] The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0030] In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "combined" with another component, it means that it may be directly placed / connected / combined with the other component, or that a third component may be placed between them.

[0031] Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of components are exaggerated for the effective illustration of the technical content. "And / or" includes all one or more combinations that the associated components may define.

[0032] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0033] Additionally, terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings.

[0034] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0035] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an overly ideal or overly formal sense unless explicitly defined herein.

[0036] Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings.

[0037] FIG. 1 is a perspective view of a display device according to one embodiment. FIG. 2 is an exploded perspective view of a display device of one embodiment shown in FIG. 1.

[0038] The display device (DD) may be a device that is activated by an electrical signal and displays an image. The display device (DD) may include various embodiments that provide an image to a user. For example, the display device (DD) may be a large device such as a television or an outdoor billboard, as well as a small to medium-sized device such as a monitor, a mobile phone, a tablet, a computer, a navigation system, or a game console. Meanwhile, the embodiments of the display device (DD) are exemplary and are not limited to any one of them without departing from the concept of the present invention.

[0039] Referring to FIG. 1, the display device (DD) may have a rectangular shape having long sides extended in a first direction (DR1) and short sides extended in a second direction (DR2) on a plane. However, it is not limited thereto, and the display device (DD) may have various shapes such as a circle or a polygon.

[0040] A display device (DD) can display an image (IM) in a third direction (DR3) through a display surface (IS) parallel to the plane defined by the first direction (DR1) and the second direction (DR2). The third direction (DR3) may substantially be parallel to the normal direction of the display surface (IS). The display surface (IS) on which the image (IM) is displayed may correspond to the front surface of the display device (DD). The image (IM) may include a still image as well as a dynamic image. Fig. 1 illustrates icons as an example of an image (IM).

[0041] In this embodiment, the front (or top) and back (or bottom) surfaces of each member or unit may be defined based on the direction in which the image (IM) is displayed. The front and back surfaces may be opposed to each other in a third direction (DR3), and the normal direction of each of the front and back surfaces may be parallel to the third direction (DR3). The distance between the front and back surfaces defined along the third direction (DR3) may correspond to the thickness of the member (or unit).

[0042] In this specification, "in a plane" may be defined as a state viewed from a third direction (DR3). In this specification, "in a cross-section" may be defined as a state viewed from a first direction (DR1) or a second direction (DR2). Meanwhile, the directions indicated by the first to third directions (DR1, DR2, DR3) are relative concepts and can be converted to other directions.

[0043] The display surface (IS) of the display device (DD) may include a display portion (D-DA) and a non-display portion (D-NDA). The display portion (D-DA) may be a portion within the front surface of the display device (DD) where an image (IM) is displayed, and the user may view the image (IM) through the display portion (D-DA). Although the present embodiment exemplarily illustrates a display portion (D-DA) having a rectangular shape on a flat surface, the display portion (D-DA) may have various shapes depending on the design of the display device (DD).

[0044] The non-display portion (D-NDA) may be a portion within the front of the display device (DD) where an image (IM) is not displayed. The non-display portion (D-NDA) may have a predetermined color and be a portion that blocks light. The non-display portion (D-NDA) may be adjacent to the display portion (D-DA). For example, the non-display portion (D-NDA) may be placed on the outside of the display portion (D-DA) to surround the display portion (D-DA). However, this is illustrated as an example, and the non-display portion (D-NDA) may be adjacent only to one side of the display portion (D-DA) or placed on a side other than the front of the display device (DD), and is not limited thereto, and the non-display portion (D-NDA) may be omitted.

[0045] FIG. 1 illustrates an exemplary display device (DD) having a planar display surface (IS). However, the display surface (IS) of the display device (DD) is not limited thereto and may be curved or three-dimensional.

[0046] The display device (DD) may be flexible. “Flexible” means the ability to bend, and may include everything from a structure that folds completely to a structure that can be bent to the level of several nanometers. For example, the flexible display device (DD) may be a curved device or a foldable device. Not limited thereto, the display device (DD) may be rigid.

[0047] A display device (DD) of one embodiment can detect external input applied from the outside. The external input may have various forms such as pressure, temperature, light, etc. provided from the outside. The external input may include not only input that comes into contact with the display device (DD) (e.g., contact by a user's hand or pen), but also input applied in close proximity to the display device (DD) (e.g., hovering).

[0048] Referring to FIG. 2, the display device (DD) may include a window (WM), a display module (DM), and an outer case (HAU). The display module (DM) may include a display panel (DP) and a light control member (LCM) disposed on the display panel (DP).

[0049] The window (WM) and the outer case (HAU) can be combined to form the exterior of the display device (DD) and can accommodate components of the display device (DD), such as a display module (DM).

[0050] A window (WM) may be placed on a display module (DM). The window (WM) may protect the display module (DM) from external impact. The front surface of the window (WM) may correspond to the display surface (IS, see FIG. 1) of the display device (DD) described above. The front surface of the window (WM) may include a transparent area (TA) and a bezel area (BA).

[0051] The transparent area (TA) of the window (WM) may be an optically transparent area. The transparent area (TA) of the window (WM) can transmit an image provided by the display module (DM), and the user can see the image. The transparent area (TA) may correspond to the display portion (D-DA, see FIG. 1) of the display device (DD).

[0052] The window (WM) may include an optically transparent insulating material. For example, the window (WM) may include glass, sapphire, or plastic. The window (WM) may have a single-layer or multi-layer structure. The window (WM) may further include functional layers, such as an anti-fingerprint layer, a phase control layer, and a hard coating layer, disposed on an optically transparent substrate.

[0053] The bezel area (BA) of the window (WM) may be an area provided by depositing, coating, or printing a material having a predetermined color on a transparent substrate. The bezel area (BA) of the window (WM) may prevent a component of the display module (DM) placed overlapping the bezel area (BA) from being visible from the outside. The bezel area (BA) may correspond to a non-display portion (D-NDA, see FIG. 1) of the display device (DD).

[0054] The display module (DM) may be positioned between the window (WM) and the outer case (HAU). The display module (DM) may display an image according to an electrical signal. The display module (DM) may include a display area (DA) and a non-display area (NDA) adjacent to the display area (DA).

[0055] The display area (DA) may be an area that is activated according to an electrical signal. The display area (DA) may be an area where an image provided by the display panel (DP) is emitted. The display area (DA) of the display module (DM) may overlap with at least a portion of the transmission area (TA). The image output from the display area (DA) can be seen from the outside through the transmission area (TA).

[0056] The non-display area (NDA) may be adjacent to the display area (DA). For example, the non-display area (NDA) may surround the display area (DA). However, it is not limited thereto, and the non-display area (NDA) may be defined in various shapes. The non-display area (NDA) may be an area where driving circuits or driving wiring for driving components placed in the display area (DA), various signal lines providing electrical signals to components, and pads are placed. The non-display area (NDA) may overlap at least a part of the bezel area (BA), and the components of the display module (DM) placed in the non-display area (NDA) may be prevented from being visible to the outside by the bezel area (BA).

[0057] A display panel (DP) according to one embodiment may be a light-emitting display panel, but is not particularly limited thereto. For example, the display panel (DP) may be an organic light-emitting display panel, an inorganic light-emitting display panel, or a quantum dot light-emitting display panel. The light-emitting layer of an organic light-emitting display panel may include an organic light-emitting material, and the light-emitting layer of an inorganic light-emitting display panel may include an inorganic light-emitting material. The light-emitting layer of a quantum dot light-emitting display panel may include quantum dots and / or quantum rods. Hereinafter, in this embodiment, the display panel (DP) is described as an organic light-emitting display panel.

[0058] The light control member (LCM) may be placed on the display panel (DP). The light control member (LCM) may be manufactured through a separate process and then provided on the display panel (DP) to be combined with the display panel (DP) through a bonding process. Not limited thereto, the light control member (LCM) may be formed on the display panel (DP) through a continuous process.

[0059] The light control member (LCM) can selectively transmit light provided by the display panel (DP) or selectively convert the wavelength of the light. In addition, the light control member (LCM) can prevent reflection of external light incident from outside the display device (DD).

[0060] The outer case (HAU) is positioned below the display module (DM) to accommodate the display module (DM). The outer case (HAU) may include a material with relatively high rigidity. The outer case (HAU) can protect the display module (DM) by absorbing shocks applied to the display module (DM) from the outside and preventing foreign substances and / or moisture from penetrating the display module (DM). In one embodiment, the outer case (HAU) may be provided in a form in which a plurality of storage members are combined.

[0061] Meanwhile, the display device (DD) may further include an input sensing module that acquires coordinate information of an external input applied from outside the display device (DD). The input sensing module of the display device (DD) can be driven in various ways, such as a capacitive method, a resistive method, an infrared method, or a pressure method, and is not limited to any one of them.

[0062] In one embodiment, the input sensing module may be placed on the display module (DM). The input sensing module may be placed directly on the display module (DM) through a continuous process, or, not limited thereto, may be manufactured separately from the display module (DM) and bonded to the display module (DM) by an adhesive layer. In one embodiment, the input sensing module may be placed between the components of the display module (DM). For example, the input sensing module may be placed between the display panel (DP) and the light control member (LCM).

[0063] FIG. 3 is a cross-sectional view of a display module according to one embodiment. Referring to FIG. 3, the display module (DM) may include a display panel (DP), a light control member (LCM), and a sealing member (SAL) and a filling member (FL) disposed between the display panel (DP) and the light control member (LCM). The description of the display panel (DP) and the light control member (LCM) may be applied in the same way as the description above.

[0064] Referring to FIG. 3, the display panel (DP) may include a lower substrate (SUB1), a circuit layer (DP-CL), a display element layer (DP-OL), and an encapsulation layer (TFE).

[0065] The lower substrate (SUB1) may include a glass substrate, a polymer substrate, or an organic / inorganic composite material substrate. The lower substrate (SUB1) may include an upper surface and a lower surface parallel to the first direction (DR1) and the second direction (DR2), respectively. The lower substrate (SUB1) may include a display area (DA) and a non-display area (NDA), and may provide a base surface on which the components of a display panel (DP) are stacked. A circuit layer (DP-CL), a display element layer (DP-OL), and an encapsulation layer (TFE) may be formed by sequentially stacking on the upper surface of the lower substrate (SUB1) in the third direction (DR3).

[0066] The display element layer (DP-OL) may include light-emitting elements disposed in the display area (DA). The circuit layer (DP-CL) may be disposed between the display element layer (DP-OL) and the lower substrate (SUB1) and may include driving elements, signal lines, and pads connected to the light-emitting elements. The light-emitting elements of the display element layer (DP-OL) may provide source light (or first light) toward the light control member (LCM) within the display area (DA).

[0067] The encapsulation layer (TFE) can be disposed on the display element layer (DP-OL) to seal the light-emitting elements. The encapsulation layer (TFE) may include a plurality of thin films. The thin films of the encapsulation layer (TFE) may be disposed to improve the optical efficiency of the light-emitting elements or to protect the light-emitting elements.

[0068] Referring to FIG. 3, the light control member (LCM) may include an upper substrate (SUB2), a color filter layer (CFL), a low-refractive index layer (LR), and a light conversion layer (LCL).

[0069] The upper substrate (SUB2) may include a glass substrate, a polymer substrate, or an organic / inorganic composite material substrate. The upper substrate (SUB2) may include a front surface and a back surface parallel to the first direction (DR1) and the second direction (DR2), respectively. The back surface of the upper substrate (SUB2) may face the upper surface of the lower substrate (SUB1). The upper substrate (SUB2) may provide a base surface on which the components of the light control member (LCM) are stacked. A color filter layer (CFL), a low refractive index layer (LR), and a light conversion layer (LCL) may be formed by sequentially stacking on the back surface of the upper substrate (SUB2) in the third direction (DR3).

[0070] The light conversion layer (LCL) may include a light control unit and a light conversion unit that are placed overlapping the display area (DA). The light conversion unit of the light conversion layer (LCL) can convert the wavelength of source light provided by a light-emitting element. The light control unit of the light conversion layer (LCL) can transmit source light. The light conversion layer (LCL) may extend from the display area (DA) and overlap the non-display area (NDA).

[0071] A color filter layer (CFL) can be placed overlappingly in a display area (DA) and can filter light that has passed through a light conversion layer (LCL). The color filter layer (CFL) may include color filters that display the same color as the pixels. The color filter layer (CFL) can prevent the color purity of the display device (DD, see FIG. 1) from degrading by absorbing light that passes through without being converted by the light conversion layer (LCL). Additionally, the color filter layer (CFL) can filter external light into colors identical to the pixels and reduce the external light reflectivity of the display device (DD, see FIG. 1).

[0072] A color filter layer (CFL) may extend from a display area (DA) and overlap with a non-display area (NDA). The color filter layer (CFL) may include color filters arranged to overlap each other within the non-display area (NDA) and may absorb light emitted or reflected through the non-display area (NDA).

[0073] A sealing member (SAL) is positioned between a display panel (DP) and a light control member (LCM) to combine the display panel (DP) and the light control member (LCM). The sealing member (SAL) may overlap with a non-display area (NDA). The display panel (DP) and the light control member (LCM) may each be formed through separate processes, and a display module (DM) may be manufactured by bonding the display panel (DP) and the light control member (LCM) using the sealing member (SAL). The sealing member (SAL) may include a UV-curable material, but the material of the sealing member (SAL) is not limited to the above examples.

[0074] A filling member (FL) is positioned between a display panel (DP) and a light control member (LCM) to fill the empty space between the display panel (DP) and the light control member (LCM) that overlaps the display area (DA). In one embodiment, the filling member (FL) may be positioned between an encapsulation layer (TFE) and a light conversion layer (LCL). The filling member (FL) may include a silicone, epoxy, or acrylic-based thermosetting material. However, the material of the filling member (FL) is not limited to the above examples.

[0075] Meanwhile, in a display module (DM) according to one embodiment of the present invention, a light control member (LCM) may be placed directly on a display panel (DP). The light control member (LCM) may be formed on the upper surface of the encapsulation layer (TFE) of the display panel (DP) through a continuous process. In this case, the sealing member (SAL) and the filling member (FL) may be omitted.

[0076] FIG. 4 is a plan view of a display panel according to one embodiment. FIG. 4 briefly illustrates one configuration of a display panel (DP) viewed from a third direction (DR3).

[0077] Referring to FIG. 4, the lower substrate (SUB1) of the display panel (DP) may include a display area (DA) and a non-display area (NDA). The display panel (DP) may include pixels (PX11~PXnm), signal lines (GL1~GLn, DL1~DLm) electrically connected to the pixels (PX11~PXnm), a driving circuit (GDC), and pads (PD).

[0078] Each of the pixels (PX11~PXnm) may include a pixel driving circuit composed of a light-emitting element described later and a plurality of transistors connected to the light-emitting element (e.g., switching transistors, driving transistors, etc.). The pixels (PX11~PXnm) may emit light in response to an electrical signal applied to the pixels (PX11~PXnm).

[0079] Pixels (PX11~PXnm) may be placed in a display area (DA). Not limited thereto, some of the pixels (PX11~PXnm) may have transistors constituting the pixels placed in a non-display area (NDA). FIG. 4 illustrates pixels (PX11~PXnm) arranged in a matrix form as an example, but the arrangement of pixels (PX11~PXnm) is not limited thereto.

[0080] The signal lines (GL1~GLn, DL1~DLm) may include gate lines (GL1~GLn) and data lines (DL1~DLm). Each pixel (PX11~PXnm) may be connected to a corresponding gate line among the gate lines (GL1~GLn) and a corresponding data line among the data lines (DL1~DLm). Depending on the configuration of the pixel driving circuit of the pixels (PX11~PXnm), more types of signal lines may be provided on the display panel (DP).

[0081] The driving circuit (GDC) may be placed in the non-display area (NDA). However, it is not limited thereto, and some components of the driving circuit (GDC) may be placed in the display area (DA), thereby minimizing the area of ​​the non-display area (NDA). The driving circuit (GDC) may include a gate driving circuit. The gate driving circuit may generate gate signals and sequentially output the gate signals to the gate lines (GL1~GLn). The gate driving circuit may further output another control signal to the pixel driving circuits of the pixels (PX11~PXnm).

[0082] Pads (PDs) may be arranged along one direction on a non-display area (NDA). Pads (PDs) may be parts connected to a circuit board. Each pad (PD) may be connected to a corresponding signal line among a plurality of signal lines (GL1~GLn, DL1~DLm) and may be connected to a corresponding pixel through the signal line. Pads (PDs) may have an integral shape with the signal lines (GL1~GLn, DL1~DLm). However, not limited thereto, pads (PDs) may be arranged on a different layer from the signal lines (GL1~GLn, DL1~DLm) and connected through contact holes.

[0083] FIG. 4 illustrates an exemplary sealing member placement area (SAL-a) corresponding to an area where a sealing member (SAL, see FIG. 3) is placed on a plane. The sealing member placement area (SAL-a) may correspond to a part of the non-display area (NDA). The sealing member placement area (SAL-a) is adjacent to the edge of the display panel (DP) and may extend along the extension direction of the edge. The sealing member placement area (SAL-a) may surround the display area (DA) on a plane. In one embodiment, the sealing member placement area (SAL-a) may be located outside the area where the driving circuit (GDC) is placed.

[0084] FIG. 5 is an enlarged plan view of a display module according to one embodiment. FIG. 5 shows an enlarged view of a portion corresponding to the aforementioned display area (DA).

[0085] Referring to FIG. 5, the display area (DA) may include light-emitting areas (PXA1, PXA2, PXA3) corresponding to light-emitting elements and a non-light-emitting area (NPXA) surrounding the light-emitting areas (PXA1, PXA2, PXA3). FIG. 5 illustrates the arrangement and shape of the light-emitting areas (PXA1, PXA2, PXA3) as an example.

[0086] The light-emitting regions (PXA1, PXA2, PXA3) may be regions corresponding to three pixels arranged along a direction parallel to the second direction (DR2) among the pixels (PX11~PXnm, see FIG. 4). Specifically, the light-emitting regions (PXA1, PXA2, PXA3) may each correspond to regions that emit light from three pixels.

[0087] The light-emitting regions (PXA1, PXA2, PXA3) may include a first light-emitting region (PXA1), a second light-emitting region (PXA2), and a third light-emitting region (PXA3). The first to third light-emitting regions (PXA1, PXA2, PXA3) may be distinguished according to the color of light emitted toward the outside of the display device (DD). A non-light-emitting region (NPXA) may be a region that sets the boundaries of the first to third light-emitting regions (PXA1, PXA2, PXA3) and prevents color mixing between the first to third light-emitting regions (PXA1, PXA2, PXA3).

[0088] One of the first to third light-emitting regions (PXA1, PXA2, PXA3) may provide a first color light corresponding to the source light provided by the light-emitting element, another may provide a second color light different from the first color light, and the remaining one may provide a third color light different from the first and second color lights. For example, the first color light may be blue light, the second color light may be red light, and the third color light may be green light. However, examples of color light are not necessarily limited to the above examples.

[0089] The first to third light-emitting regions (PXA1, PXA2, PXA3) may be arranged repeatedly within a display area (DA) in a predetermined arrangement. The first to third light-emitting regions (PXA1, PXA2, PXA3) may be arranged along a first direction (DR1) and a second direction (DR2). Referring to FIG. 5, in one embodiment, the first light-emitting regions (PXA1), the second light-emitting regions (PXA2), and the third light-emitting regions (PXA3) may each be arranged along the first direction (DR1). The first light-emitting region (PXA1), the second light-emitting region (PXA2), and the third light-emitting region (PXA3) may be arranged sequentially along the second direction (DR2). However, the arrangement of the first to third light-emitting regions (PXA1, PXA2, PXA3) may be designed in various ways, not limited to the embodiment illustrated in FIG. 5.

[0090] The first to third light-emitting regions (PXA1, PXA2, PXA3) may have various shapes on a plane. For example, as shown in FIG. 5, each of the first to third light-emitting regions (PXA1, PXA2, PXA3) may have a rectangular shape. However, not limited thereto, each of the first to third light-emitting regions (PXA1, PXA2, PXA3) may have a polygonal, circular, elliptical, or irregular shape.

[0091] The first to third light-emitting regions (PXA1, PXA2, PXA3) may have the same shape on a plane. However, they are not limited thereto, and at least some of the first to third light-emitting regions (PXA1, PXA2, PXA3) may have different shapes.

[0092] The first to third light-emitting regions (PXA1, PXA2, PXA3) may have the same area on a plane. However, they are not limited thereto, and at least some of the first to third light-emitting regions (PXA1, PXA2, PXA3) may have different areas on a plane, which may be set according to the light-emitting color. For example, among the main colors, the area of ​​the light-emitting region emitting green light may be the largest, and the area of ​​the light-emitting region emitting blue light may be the smallest.

[0093] The embodiment illustrated in FIG. 5 is exemplary, and the shape, area, and arrangement of the first to third light-emitting regions (PXA1, PXA2, PXA3) can be designed in various ways depending on the light emission efficiency and the design of the display module (DM).

[0094] FIG. 6 is an enlarged plan view of a light conversion layer according to one embodiment. FIG. 7a and FIG. 7b are cross-sectional views of a display module corresponding to line I-I' in FIG. 6. FIG. 6 briefly illustrates a plan view of a light conversion layer (LCL) corresponding to the display area (DA) shown in FIG. 5. The embodiments shown in FIG. 7a and FIG. 7b include substantially the same configuration, except for some differences in the configuration of the light conversion units (WCP1, WPC2).

[0095] Referring to FIGS. 6 and 7a, the light conversion layer (LCL) may include light conversion units (WCP1, WCP2) and a light control unit (LCP). The light conversion layer (LCL) will be described in detail later.

[0096] Referring to FIG. 7a, the display panel (DP) may include a lower substrate (SUB1), a circuit layer (DP-CL), a display element layer (DP-OL), and an encapsulation layer (TFE), and the description of each component may be applied in the same way as the description above.

[0097] The display panel (DP) may include an insulating layer, a semiconductor pattern, a conductive pattern, and signal lines. In the manufacturing step of the display panel (DP), an insulating layer, a semiconductor layer, and a conductive layer may be formed on a lower substrate (SUB1) by methods such as coating or deposition, and subsequently, the insulating layer, the semiconductor layer, and the conductive layer may be selectively patterned by a photolithography process. Through these processes, the semiconductor pattern, conductive pattern, signal lines, etc. included in the display panel (DP) may be formed.

[0098] The lower substrate (SUB1) may provide a base surface on which a circuit layer (DP-CL) is formed. The lower substrate (SUB1) may have a single-layer or multi-layer structure. For example, the lower substrate (SUB1) having a multi-layer structure may include synthetic resin layers and at least one inorganic layer disposed between the synthetic resin layers, or may include a glass substrate and a synthetic resin layer disposed on the glass substrate. However, embodiments of the lower substrate (SUB1) are not limited thereto.

[0099] The synthetic resin layer included in the lower substrate (SUB1) may include at least one of acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, urethane resin, cellulose resin, siloxane resin, polyamide resin, perylene resin, and polyimide resin. However, the material of the synthetic resin layer is not limited to the above examples.

[0100] The circuit layer (DP-CL) may include driving elements that constitute an equivalent circuit of pixels. For example, the circuit layer (DP-CL) may include at least one insulating layer, transistors connected to light-emitting elements (OL1, OL2, OL3), signal lines, etc. The transistors may include semiconductor patterns, and depending on the configuration of the equivalent circuit of pixels, the semiconductor patterns may be arranged in a predetermined order on a plane. The semiconductor patterns may include polysilicon, amorphous silicon, crystalline oxide, or amorphous oxide.

[0101] The display element layer (DP-OL) may be disposed on the circuit layer (DP-CL). The display element layer (DP-OL) may include the aforementioned first to third light-emitting regions (PXA1, PXA2, PXA3) and non-light-emitting region (NPXA). The display element layer (DP-OL) may include a plurality of light-emitting elements (OL1, OL2, OL3) and a pixel defining film (PDL).

[0102] The light-emitting elements (OL1, OL2, OL3) may each include first to third light-emitting elements (OL1, OL2, OL3) corresponding to first to third light-emitting regions (PXA1, PXA2, PXA3). Each of the first to third light-emitting elements (OL1, OL2, OL3) may include a first electrode (AE1, AE2, AE3), a light-emitting layer (EML1, EML2, EML3), and a second electrode (CE1, CE2, CE3).

[0103] The first electrodes (AE1, AE2, AE3) of the first to third light-emitting elements (OL1, OL2, OL3) may be spaced apart from each other on the circuit layer (DP-CL). The first electrodes (AE1, AE2, AE3) of the first to third light-emitting elements (OL1, OL2, OL3) may each be connected to a transistor of the corresponding circuit layer (DP-CL).

[0104] A pixel defining film (PDL) may be disposed on a circuit layer (DP-CL). For example, the pixel defining film (PDL) may be disposed on the uppermost insulating layer of the circuit layer (DP-CL). The pixel defining film (PDL) may define light-emitting openings (PX-OP) that expose at least a portion of each of the first electrodes (AE1, AE2, AE3) of the first to third light-emitting elements (OL1, OL2, OL3). The regions of the first electrodes (AE1, AE2, AE3) of the first to third light-emitting elements (OL1, OL2, OL3) exposed by the light-emitting openings (PX-OP) may correspond to the first to third light-emitting regions (PXA1, PXA2, PXA3), respectively. The pixel defining film (PDL) may correspond to a non-emissive region (NPXA) surrounding the first to third light-emitting regions (PXA1, PXA2, PXA3).

[0105] The pixel defining layer (PDL) may include a polymer resin. For example, the pixel defining layer (PDL) may include a polyacrylate-based resin or a polyimide-based resin. The pixel defining layer (PDL) may further include inorganic materials in addition to the polymer resin. Not limited thereto, the pixel defining layer (PDL) may be formed from inorganic materials. For example, the pixel defining layer (PDL) may be silicon nitride (SiN x ), silicon oxide (SiO₂ x ), silicon nitrate (SiO₂) x N y It may include ) etc.

[0106] In one embodiment, the pixel defining film (PDL) may further include a light-absorbing material. For example, the pixel defining film (PDL) may include a black coloring agent. The black coloring agent may include a black dye or a black pigment. The black coloring agent may include carbon black, a metal such as chromium, or oxides thereof. However, embodiments of the pixel defining film (PDL) are not limited thereto.

[0107] The light-emitting layers (EML1, EML2, EML3) of the first to third light-emitting elements (OL1, OL2, OL3) may each be disposed on the first electrodes (AE1, AE2, AE3). The light-emitting layers (EML1, EML2, EML3) of the first to third light-emitting elements (OL1, OL2, OL3) may each be disposed corresponding to the light-emitting openings (PX-OP). The embodiments are not limited thereto, and the light-emitting layers (EML1, EML2, EML3) of the first to third light-emitting elements (OL1, OL2, OL3) may be provided as a common layer having an integral shape.

[0108] Each of the light-emitting layers (EML1, EML2, EML3) may include an organic light-emitting material, an inorganic light-emitting material, a quantum dot, or a quantum rod. Each of the light-emitting layers (EML1, EML2, EML3) of the first to third light-emitting elements (OL1, OL2, OL3) may generate source light. Here, the source light may be a first color light. For example, the first color light may be blue light, but the embodiments are not necessarily limited thereto.

[0109] The light-emitting layers (EML1, EML2, EML3) of the first to third light-emitting elements (OL1, OL2, OL3) may have the same configuration or the same thickness. However, not limited thereto, the configuration and / or thickness of the light-emitting layers (EML1, EML2, EML3) of the first to third light-emitting elements (OL1, OL2, OL3) may differ from each other.

[0110] Each of the first to third light-emitting elements (OL1, OL2, OL3) may be a light-emitting element of a tandem structure in which a plurality of light-emitting layers (EML1, EML2, EML3) are provided. The light-emitting layers included in each of the first to third light-emitting elements (OL1, OL2, OL3) may be layers that produce substantially the same color light, but are not limited thereto, and some may be layers that produce different color light. For example, each of the light-emitting elements (OL1, OL2, OL3) may include four light-emitting layers, and all four light-emitting layers may substantially produce blue light. Not limited thereto, in one embodiment, three of the four light-emitting layers may produce blue light and one light-emitting layer may produce green light. The light-emitting devices (OL1, OL2, OL3) of the tandem structure may further include functional layers such as a hole control layer, an electron control layer, and a charge generation layer disposed between the light-emitting layers.

[0111] The second electrodes (CE1, CE2, CE3) of the first to third light-emitting elements (OL1, OL2, OL3) may be disposed on the light-emitting layers (EML1, EML2, EML3). The second electrodes (CE1, CE2, CE3) of the first to third light-emitting elements (OL1, OL2, OL3) may be connected to each other and provided as a common layer having a single shape. The connected second electrodes (CE1, CE2, CE3) may overlap the light-emitting regions (PXA1, PXA2, PXA3) and the non-light-emitting region (NPXA). A common voltage may be provided to the pixels through the connected second electrodes (CE1, CE2, CE3).

[0112] Each of the light-emitting elements (OL1, OL2, OL3) may have a predetermined first voltage applied to the first electrode (AE1, AE2, AE3) and a second voltage that is different in level from the first voltage may be applied to the second electrode (CE1, CE2, CE3). Holes and electrons injected into the light-emitting layers (EML1, EML2, EML3) combine to form excitons, and as the excitons transition to the ground state, the light-emitting elements (OL1, OL2, OL3) may emit light.

[0113] The light-emitting elements (OL1, OL2, OL3) may further include a light-emitting functional layer, such as a hole control layer and an electronic control layer, disposed between the first electrodes (AE1, AE2, AE3) and the second electrodes (CE1, CE2, CE3). The hole control layer is disposed between the first electrode and the light-emitting layer and may include at least one of a hole transport layer and a hole injection layer, and the electronic control layer is disposed between the light-emitting layer and the second electrode and may include at least one of an electron transport layer and an electron injection layer. The light-emitting functional layer of the light-emitting elements (OL1, OL2, OL3) may be provided as a common layer and may overlap the light-emitting regions (PXA1, PXA2, PXA3) and the non-light-emitting region (NPXA).

[0114] The encapsulation layer (TFE) can be disposed on the display element layer (DP-OL) to seal the light-emitting elements (OL1, OL2, OL3). The encapsulation layer (TFE) may include first to third encapsulation films (EN1, EN2, EN3). The first encapsulation film (EN1) may be disposed on the second electrodes (CE1, CE2, CE3), and the second encapsulation film (EN2) and the third encapsulation film (EN3) may be disposed sequentially on the first encapsulation film (EN1).

[0115] In one embodiment, the first and third sealing films (EN1, EN3) may include an inorganic film, and the inorganic film may protect the display element layer (DP-OL) from moisture and / or oxygen. For example, the inorganic film may include at least one of aluminum oxide, titanium oxide, silicon oxide, silicon nitride, silicon oxynitride, zirconium oxide, and hafnium oxide, but is not limited to the above examples.

[0116] In one embodiment, the second sealing film (EN2) may include an organic film, and the organic film may protect the display element layer (DP-OL) from foreign substances such as dust particles. For example, the organic film may include an acrylic resin, but is not limited to the above example.

[0117] A charging member (FL) may be placed between a display panel (DP) and a light control member (LCM). The gap between the display panel (DP) and the light control member (LCM) may be filled by the charging member (FL). However, not limited thereto, the charging member (FL) may be omitted, and the light control member (LCM) may be placed directly on the display panel (DP).

[0118] In one embodiment, the display module (DM) may further include a column spacer positioned between the display panel (DP) and the light control member (LCM) and overlapping the non-luminous region (NPXA). The column spacer may be surrounded by a filling member (FL). The column spacer may support the display panel (DP) and the light control member (LCM) so that the display panel (DP) and the light control member (LCM) are bonded flatly.

[0119] Referring to FIG. 7a, the light control member (LCM) may include an upper substrate (SUB2), a color filter layer (CFL), a low-refractive index layer (LR), a light conversion layer (LCL), a first capping layer (CP1), and a second capping layer (CP2) disposed on a display panel (DP). The back surface of the upper substrate (SUB2) may face the upper surface of the lower substrate (SUB1). The color filter layer (CFL), the low-refractive index layer (LR), the first capping layer (CP1), the light conversion layer (LCL), and the second capping layer (CP2) may be sequentially disposed on the back surface of the upper substrate (SUB2) in a third direction (DR3).

[0120] Referring to FIGS. 6 and 7a, the light conversion units (WCP1, WCP2) and the light control unit (LCP) may be placed between the low-refractive index layer (LR) and the display panel (DP). The light conversion units (WCP1, WCP2) and the light control unit (LCP) may be placed on the same layer.

[0121] A plurality of openings (OP1, OP2) may be defined in the light control unit (LCP). Each of the openings (OP1, OP2) may be formed by penetrating the light control unit (LCP). The openings (OP1, OP2) may include a first opening (OP1) that overlaps a first light-emitting element (OL1) and a second opening (OP2) that overlaps a second light-emitting element (OL2). The first opening (OP1) may overlap a first light-emitting region (PXA1), and the second opening (OP2) may overlap a second light-emitting region (PXA2). The planar area of ​​the first opening (OP1) may be substantially equal to or larger than the area of ​​the first light-emitting region (PXA1). The planar area of ​​the second opening (OP2) may be substantially equal to or larger than the area of ​​the second light-emitting region (PXA2).

[0122] The light conversion units (WCP1, WCP2) may include a first light conversion unit (WCP1) disposed in a first opening (OP1) and a second light conversion unit (WCP2) disposed in a second opening (OP2). The light control unit (LCP) may surround the first and second light conversion units (WCP1, WCP2) on a plane.

[0123] Referring to FIG. 6, each of the first and second openings (OP1, OP2) may be provided in plurality corresponding to a plurality of first and second light-emitting regions (PXA1, PXA2). In this case, each of the first light-converting unit (WCP1) and the second light-converting unit (WCP2) may be provided in plurality. The first light-converting units (WCP1) may be placed in each of the first openings (OP1), and the second light-converting units (WCP2) may be placed in each of the second openings (OP2).

[0124] Referring to FIGS. 6 and FIGS. 7a, the first light conversion unit (WCP1) can be superimposed on the first light-emitting element (OL1), and the second light conversion unit (WCP2) can be superimposed on the second light-emitting element (OL2). That is, the first light conversion unit (WCP1) can be superimposed on the first light-emitting region (PXA1), and the second light conversion unit (WCP2) can be superimposed on the second light-emitting region (PXA2).

[0125] The first light conversion unit (WCP1) may include a base resin (BR1) and first quantum dots (QD1) dispersed in the base resin (BR1). The first quantum dots (QD1) can convert the first light provided by the first light-emitting element (OL1) into second light with a wavelength range different from that of the first light. The second light conversion unit (WCP2) may include a base resin (BR2) and second quantum dots (QD2) dispersed in the base resin (BR2). The second quantum dots (QD2) can convert the first light provided by the second light-emitting element (OL2) into third light with a wavelength range different from that of the first light. Here, the wavelength range of the second light and the wavelength range of the third light may be different from each other. For example, the first quantum dots (QD1) can convert the source light provided by the first light-emitting element (OL1) into red light, and the second quantum dots (QD2) can convert the source light provided by the second light-emitting element (OL2) into green light. The first and second quantum dots (QD1, QD2) will be explained in detail later.

[0126] The light control unit (LCP) can be superimposed on the third light-emitting element (OL3). The light control unit (LCP) superimposed on the third light-emitting region (PXA3) can transmit the first light provided by the third light-emitting element (OL3). For example, the third light-emitting element (OL3) can provide blue light, and the blue light can pass through the light control unit (LCP) and be emitted toward the front of the display module (DM).

[0127] That is, in one embodiment, the display module (DM) can emit red light through the first light-emitting region (PXA1), emit green light through the second light-emitting region (PXA2), and emit blue light through the third light-emitting region (PXA3). Through the first to third light-emitting regions (PXA1, PXA2, PXA3), each displaying red, green, and blue, the display module (DM) can display a predetermined image within the display region (DA). However, the color of the light emitted through the light-emitting regions (PXA1, PXA2, PXA3) is not necessarily limited to this.

[0128] The light control unit (LCP) may be extended from the third light-emitting region (PXA3) and positioned on the non-light-emitting region (NXPA). That is, the light control unit (LCP) may include a first part (P1) overlapping the non-light-emitting region (NPXA) and a second part (P2) overlapping the third light-emitting region (PXA3). The first part (P1) may surround the second part (P2) on a plane.

[0129] The first part (P1) and the second part (P2) may be formed of the same material. Each of the first part (P1) and the second part (P2) may include a base resin (BR3) and a scatterer (SP) dispersed in the base resin (BR3). The first part (P1) and the second part (P2) may be connected to each other to form a single light control unit (LCP).

[0130] The scatterers (SP) can scatter light incident from the third light-emitting element (OL3) to the light control unit (LCP) in various directions. The scatterers (SP) may be particles having a relatively high density or specific gravity. For example, the scatterers (SP) may be titanium oxide (TiO₂). x It may include ) or silica-based nanoparticles, etc. The scatterers (SP) are provided from the light-emitting element and can improve the light emission efficiency of the light passing through the light control unit (LCP).

[0131] Referring to FIG. 7b, the first light conversion unit (WCP1) and the second light conversion unit (WCP2) may each further include scatterers (SP1, SP2) dispersed in base resins (BR1, BR2). The description of the scatterer (SP) of the light control unit (LCP) may be applied in the same way to the scatterers (SP1, SP2) included in the first light conversion unit (WCP1) and the second light conversion unit (WCP2). The scatterers (SP1, SP2) included in the first light conversion unit (WCP1) and the second light conversion unit (WCP2) can scatter light within the light conversion unit to improve the light conversion efficiency by the quantum dots (QD1, QD2).

[0132] FIG. 7b illustrates an embodiment in which both the first light conversion unit (WCP1) and the second light conversion unit (WCP2) include scatterers (SP1, SP2), but is not limited thereto, and in one embodiment, scatterers may be included in one of the conversion units of the first light conversion unit (WCP1) and the second light conversion unit (WCP2).

[0133] Referring to FIG. 7a, a second part (P2) adjacent to a first part (P1) may form a step with respect to the first part (P1). Each of the first part (P1) and the second part (P2) may include a first surface (S1) and a second surface (S2) facing the display panel (DP), and the second surface (S2) of the second part (P2) may be recessed from the first surface (S1) of the first part (P1) to form a step. Accordingly, in cross-section, the second surface (S2) of the second part (P2) may be further separated from the upper surface of the display panel (DP) than the first surface (S1) of the first part (P1).

[0134] In the light control unit (LCP), a recessed portion (RP) formed from the back surface of the light control unit (LCP) may be defined. The inner surface (IN-S) of the first part (P1), which is bent from the first surface (S1) of the first part (P1), may be connected to the second surface (S2) of the second part (P2). The inner surface (IN-S) of the first part (P1) and the second surface (S2) of the second part (P2), which are connected to each other, may form the recessed portion (RP) of the light control unit (LCP).

[0135] The width of the first part (P1) in the second direction (DR2) positioned between the first opening (OP) and the second opening (OP) in the cross-section may decrease as it approaches the upper substrate (SUB2). Accordingly, the first part (P1) may have an inverse taper shape in the cross-section. However, the embodiment is not necessarily limited thereto, and the shape of the first part (P1) may be modified according to process conditions.

[0136] In cross-section, the width of the recess (RP) in the second direction (DR2) may increase as it approaches the upper substrate (SUB2). Accordingly, the angle between the inner surface (IN-S) of the first part (P1) and the second surface (S2) of the second part (P2) may be an acute angle. However, the embodiment is not necessarily limited thereto, and the shape of the recess (RP) may be modified according to process conditions.

[0137] The thickness (TH1) of the second part (P2) may be smaller than the width (WD) of the first part (P1) adjacent to the second part (P2). The thickness (TH1) of the second part (P2) may correspond to the gap between the second surface (S2) of the second part (P2) and the upper surface of the second part (P2) facing the second surface (S2) in the third direction (DR3). In one embodiment, the thickness (TH1) of the second part (P2) may be smaller than the thickness (TH2) of the first light conversion part (WCP1) and the thickness (TH3) of the second light conversion part (WCP2), respectively.

[0138] One opening of the second part (P2) and the light control part (LCP) can be arranged along the second direction (DR2), and the width (WD) of the first part (P1) in the second direction (DR2) can correspond to the width of the first surface (S1). The width (WD) of the first part (P1) can correspond to the gap between one end of the first part (P1) defining the one opening in the second direction (DR2) and the other end of the first part (P1) adjacent to the second part (P2). That is, the width (WD) of the first part (P1) can correspond to the distance between the recess (RP) and the one opening adjacent to the recess (RP) on a plane.

[0139] For example, the third light-emitting region (PXA3) and the second light-emitting region (PXA2) may be arranged along the second direction (DR2), in which case the width (WD) of the first part (P1) located between the second part (P2) and the second opening (OP2) may correspond to the gap between one end of the first part (P1) defining the second opening (OP2) adjacent to the recess (RP) in the second direction (DR2) and the other end of the first part (P1) defining the recess (RP). Likewise, the third light-emitting region (PXA3) and the first light-emitting region (PXA1) may be arranged along the second direction (DR2), in which case the width of the first part (P1) located between the second part (P2) and the first opening (OP1) may correspond to the gap between one end of the first part (P1) defining the first opening (OP1) adjacent to the recess (RP) in the second direction (DR2) and the other end of the first part (P1) defining the recess (RP).

[0140] As the width (WD) of the first part (P1) has a value greater than the thickness (TH1) of the second part (P2), the ratio of side light emitted from the third light-emitting element (OL3) and passing through the first part (P1) may be smaller than the ratio of front light emitted from the third light-emitting element (OL3) and passing through the second part (P2). That is, it is possible to prevent the light emitted from the third light-emitting element (OL3) and passing through the first part (P1) from being mixed with the light emitted through light-emitting regions other than the third light-emitting region (PXA3) (e.g., first and second light-emitting regions (PXA1, PXA2)).

[0141] In one embodiment, the difference between the width (WD) of the first part (P1) and the thickness (TH1) of the second part (P2) may be 6 μm or more. In this case, the ratio of side light passing through the first part (P1) to front light passing through the second part (P2) may be maintained at 1% or less. However, the embodiment is not limited thereto, and the difference value between the width (WD) of the first part (P1) and the thickness (TH1) of the second part (P2) may be designed differently depending on the optical density of the light control unit (LCP).

[0142] By including a light control unit (LCP) comprising a first part (P1) that prevents color mixing between light-emitting regions (PXA1, PXA2, PXA3) and a second part (P2) that transmits light provided by a light-emitting element, a separate partition unit that sets the boundaries of the first to third light-emitting regions (PXA1, PXA2, PXA3) can be omitted. As the width (WD) of the first part (P1) that overlaps the non-light-emitting region (NPXA) has a value greater than the thickness (TH1) of the second part (P2) that overlaps the third light-emitting region (PXA3), the ratio of side light to front light can be lowered, and the light control unit (LCP) can maintain the light emission efficiency of the light-emitting element that overlaps the light control unit (LCP) while simultaneously preventing color mixing between the light-emitting regions (PXA1, PXA2, PXA3).

[0143] In the same photolithography process, an integrated light control unit (LCP) can be formed overlapping the third light-emitting region (PXA3) and the non-light-emitting region (NPXA), and the formation process of the light conversion layer (LCL) and the display device (DD, see FIG. 1) can be simplified. Additionally, by forming the light control unit (LCP) through the photolithography process, the density of scatterers (SP) within the light control unit (LCP) overlapping the third light-emitting regions (PXA3) can be formed uniformly, and defects in the display device (DD, see FIG. 1), such as stains or yellowing within the display region (DA) caused by non-uniformity in the density of scatterers (SP), can be prevented.

[0144] The cores of the quantum dots (QD1, QD2) included in each of the first light conversion unit (WCP1) and the second light conversion unit (WCP2) can be selected from group II-VI compounds, group III-VI compounds, group I-III-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds, and combinations thereof.

[0145] Group II-VI compounds are diatomic compounds selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; ternary compounds selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS, and mixtures thereof; and HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, It can be selected from the group consisting of four element compounds selected from the group consisting of HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0146] Group III-VI compounds may include binary compounds such as In2S3, In2Se3, ternary compounds such as InGaS3, InGaSe3, or any combination thereof.

[0147] Group I-III-VI compounds may be selected from ternary compounds selected from the group consisting of AgInS, AgInS2, CuInS, CuInS2, AgGaS2, CuGaS2, CuGaO2, AgGaO2, AgAlO2, and mixtures thereof, or from quaternary compounds such as AgInGaS2 and CuInGaS2.

[0148] III-V compounds may be selected from the group consisting of diatomic compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; ternary compounds selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. Meanwhile, III-V compounds may further include a Group II metal. For example, InZnP, etc., can be selected as a Group III-II-V compound.

[0149] Group IV-VI compounds may be selected from the group consisting of diatomic compounds selected from SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof; ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof; and quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof. Group IV elements may be selected from the group consisting of Si, Ge, and mixtures thereof. Group IV compounds may be diatomic compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0150] In this case, the dielementary compound, ternary compound, or quaternary compound may exist within the particle at a uniform concentration, or may exist within the same particle with the concentration distribution divided into partially different states.

[0151] Quantum dots (QD1, QD2) may have a core-shell structure comprising a core and a shell surrounding the core. Additionally, in one embodiment, one quantum dot may have a core / shell structure surrounding another quantum dot. The interface between the core and the shell may have a concentration gradient in which the concentration of an element present in the shell decreases toward the center.

[0152] In one embodiment, the quantum dots (QD1, QD2) may have a core-shell structure including the aforementioned nanocrystal. The shell of the quantum dot may serve as a protective layer to maintain semiconductor properties by preventing chemical degradation of the core and / or as a charging layer to impart electrophoretic properties to the quantum dot. The shell may be a single layer or a multilayer. The interface between the core and the shell may have a concentration gradient in which the concentration of elements present in the shell decreases toward the center. Examples of the shell of the quantum dot include metal oxides, non-metal oxides, semiconductor compounds, or combinations thereof.

[0153] For example, metal oxides and nonmetal oxides may include binary compounds such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, and NiO, or ternary compounds such as MgAl2O4, CoFe2O4, NiFe2O4, and CoMn2O4, but the materials are not limited to the above examples.

[0154] In addition, semiconductor compounds may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc., but the materials are not limited to the above examples.

[0155] Quantum dots (QD1, QD2) can have a full width of half maximum (FWHM) of the emission wavelength spectrum of about 45 nm or less, preferably about 40 nm or less, more preferably about 30 nm or less, and color purity or color reproducibility can be improved within the above range. In addition, since the light emitted through these quantum dots (QD1, QD2) is emitted in all directions, the wide viewing angle can be improved.

[0156] The shape of the quantum dots (QD1, QD2) is not specifically limited to shapes commonly used in the field, but, for example, shapes such as spherical, pyramidal, multi-arm, or cubic nanoparticles, nanotubes, nanowires, nanofibers, or nanoplate particles may be used.

[0157] Quantum dots (QD1, QD2) can control the color of the light they emit according to their particle size, and accordingly, the quantum dots (QD1, QD2) can have various emission colors such as blue, red, and green. Meanwhile, if the aforementioned light-emitting layers (EML1, EML2, EML3) contain quantum dot materials, the description of the quantum dots (QD1, QD2) described above can be applied in the same way to the quantum dot materials included in the light-emitting layers (EML1, EML2, EML3).

[0158] A low-refractive index layer (LR) may be placed between a light conversion layer (LCL) and a color filter layer (CFL). The low-refractive index layer (LR) may have a refractive index smaller than the refractive index of each of the first and second light conversion units (WCP1, WCP2) and the light control unit (LCP). For example, the refractive index of the low-refractive index layer (LR) may be 1.1 or greater and 1.5 or less, specifically 1.1 or greater and 1.35 or less. However, the refractive index of the low-refractive index layer (LR) is not limited to the above numerical examples. The low-refractive index layer (LR) may include a low-refractive index organic film with a relatively low refractive index. The low-refractive index layer (LR) may further include hollow particles and / or voids dispersed within the organic film, and the refractive index of the low-refractive index layer (LR) may be controlled by the ratio of hollow particles and / or voids.

[0159] A low-refractive index layer (LR) placed on a light conversion layer (LCL) can use its refractive index to re-introduce light emitted from the upper surface of the light conversion units (WCP1, WCP2) that is not converted by the light conversion units (WCP1, WCP2) back into the light conversion units (WCP1, WCP2). The light re-introduced into the light conversion units (WCP1, WCP2) by the low-refractive index layer (LR) can be converted by quantum dots (QD1, QD2). That is, the low-refractive index layer (LR) can improve the light emission efficiency of the display device (DD, see FIG. 1) through the recirculation of light due to the difference in refractive index.

[0160] The low refractive index layer (LR) may include a material having high light transmittance. For example, the low refractive index layer (LR) may have a high transmittance of 90% or more. As the low refractive index layer (LR) has high transmittance, it may not reduce the transmittance of light emitted toward the front of the display module (DM).

[0161] The first capping layer (CP1) may be disposed on the back surface of the low-refractive index layer (LR) facing the display panel (DP). The first capping layer (CP1) may include an inorganic material. The first capping layer (CP1) can prevent moisture or gas from entering the low-refractive index layer (LR).

[0162] The second capping layer (CP2) may be disposed on the back surface of the light conversion layer (LCL) facing the display panel (DP). The second capping layer (CP2) may include an inorganic material. The second capping layer (CP2) can prevent moisture or foreign substances from entering the light conversion layer (LCL). The first capping layer (CP1) and the second capping layer (CP2) each cover the upper and lower parts of the light conversion layer (LCL), respectively, to protect the light conversion layer (LCL) and prevent deterioration caused by moisture.

[0163] Meanwhile, the stacking order of the components of the light control member (LCM) is not limited to that shown in FIG. 7a. For example, the low-refractive index layer (LR) of the light control member (LCM) may be placed on the back surface of the light conversion layer (LCL). Alternatively, the light control member (LCM) may include a plurality of low-refractive index layers, one of which may be placed between the color filter layer (CFL) and the light conversion layer (LCL), and the other may be placed on the back surface of the light conversion layer (LCL).

[0164] The color filter layer (CFL) may include a first color filter (CF1), a second color filter (CF2), and a third color filter (CF3). The first to third color filters (CF1, CF2, CF3) may each be arranged on a plane corresponding to the first to third light-emitting regions (PXA1, PXA2, PXA3). For example, the first color filter (CF1) may overlap the first light-emitting region (PXA1), the second color filter (CF2) may overlap the second light-emitting region (PXA2), and the third color filter (CF3) may overlap the third light-emitting region (PXA3).

[0165] Each of the first to third color filters (CF1, CF2, CF3) may include a base resin and a pigment or dye dispersed in the base resin. Each of the first to third color filters (CF1, CF2, CF3) transmits light having a specific wavelength range and can absorb most of the light having a wavelength range other than the specific wavelength range.

[0166] For example, one of the first to third color filters (CF1, CF2, CF3) may include a red color filter, another may include a green color filter, and yet another may include a blue color filter. The red color filter transmits red light and can absorb most of the green and blue light. The green color filter transmits green light and can absorb most of the red and blue light. The blue color filter transmits blue light and can absorb most of the red and green light. However, the colors of the color filters are not limited to the description above.

[0167] A first color filter (CF1) may be placed on a first light conversion unit (WCP1). The first color filter (CF1) may transmit second light provided from the first light conversion unit (WCP1). For example, the first light conversion unit (WCP1) may convert first light provided from a first light-emitting element (OL1) into red light, and the first color filter (CF1) may transmit red light provided from the first light conversion unit (WCP1). The first color filter (CF1) may absorb green light and blue light incident toward the first color filter (CF1). The first color filter (CF1) may absorb light that is not changed by the first light conversion unit (WCP1) among the light incident toward the first color filter (CF1), thereby preventing the color purity from degrading within the first light-emitting region (PXA1).

[0168] The second color filter (CF2) is positioned on the second light conversion unit (WCP2) and can transmit the third light provided from the second light conversion unit (WCP2). For example, the second light conversion unit (WCP2) can convert the first light provided from the second light-emitting element (OL2) into green light, and the second color filter (CF2) can transmit the green light provided from the second light conversion unit (WCP2). The second color filter (CF2) can absorb red light and blue light incident toward the second color filter (CF2). The second color filter (CF2) can absorb light that is not changed by the second light conversion unit (WCP2) among the light incident toward the second color filter (CF2), thereby preventing the color purity from degrading within the second light-emitting region (PXA2).

[0169] A third color filter (CF3) may be placed on the light control unit (LCP). The third color filter (CF3) may be superimposed on the second part (P2) of the light control unit (LCP). The third color filter (CF3) may transmit the first light provided from the third light-emitting element (OL3) and passing through the light control unit (LCP). For example, the third color filter (CF3) may transmit blue light and absorb green and red light to prevent a decrease in color purity within the third light-emitting region (PXA3).

[0170] External light, such as natural light, may be incident from outside the display module (DM) toward the display module (DM). The external light may include red light, green light, and blue light. If the display module (DM) does not include a color filter layer (CFL), the external light incident toward the display module (DM) may be reflected by conductive patterns (e.g., signal lines, electrodes, etc.) inside the display module (DM) and provided to the user, and the user may perceive the reflected light.

[0171] The first to third color filters (CF1, CF2, CF3) can prevent reflection of external light. For example, the first color filter (CF1) may be a red color filter and can filter the external light into red light by absorbing light corresponding to green light and blue light among the external light. In this same principle, the second color filter (CF2) may be a green color filter and can filter the external light into green light by absorbing light corresponding to red light and blue light among the external light. The third color filter (CF3) may be a blue color filter and can filter the external light into blue light by absorbing light corresponding to red light and green light among the external light.

[0172] At least two of the first to third color filters (CF1, CF2, CF3) may overlap each other within a non-emissive region (NPXA). For example, the first to third color filters (CF1, CF2, CF3) may be arranged to overlap each other along a third direction (DR3) within the non-emissive region (NPXA). The first to third color filters (CF1, CF2, CF3) arranged to overlap each other may overlap the first part (P1) of the light control unit (LCP). The first to third color filters (CF1, CF2, CF3) arranged to overlap each other may block light passing through the non-emissive region (NPXA) to prevent color mixing between the first to third light-emitting regions (PXA1, PXA2, PXA3).

[0173] FIG. 8 is a flowchart of a method for manufacturing a display device according to one embodiment. FIGS. 9a to 9f are cross-sectional views illustrating one step of a method for manufacturing a display device according to one embodiment of the present invention.

[0174] Referring to FIG. 8, a method for manufacturing a display device according to one embodiment may include a step of providing a substrate (S10), a step of forming color filters (S20), a step of forming a preliminary light control unit (S30), a step of forming a light control unit (S40), a step of forming a light conversion unit (S50), and a step of providing a display panel (S60).

[0175] The substrate provided in the substrate providing step (S10) may correspond to the aforementioned upper substrate (SUB2, see FIG. 7a). In the color filter formation step (S20), a plurality of color filters may be sequentially formed on one side of the upper substrate (SUB2) through a photolithography process. In the preliminary light control unit formation step (S30), a base resin in which scatterers are dispersed may be applied to the substrate on which the color filters are arranged to form a preliminary light control unit. Subsequently, the preliminary light control unit may be patterned to form a light control unit having an opening and a recess (S40). Subsequently, in the light conversion unit formation step (S50), a base resin in which quantum dots are dispersed within the opening of the light control unit may be applied to form a light conversion unit. Subsequently, a display panel including a plurality of light-emitting elements may be provided (S60) on the substrate on which the light control unit and the light conversion unit are formed. Here, the display panel may correspond to the aforementioned display panel (DP, see FIG. 7a). A display device can be formed by bonding a display panel and a substrate having a color filter and a light control unit formed thereon. Hereinafter, steps of a method for manufacturing a display device will be described in detail with reference to FIGS. 9a to 9f.

[0176] FIGS. 9a to 9f, for convenience of explanation, show first to third light-emitting regions (PXA1, PXA2, PXA3) corresponding to light-emitting elements (OL1, OL2, OL3, see FIG. 7a) of a display panel (DP, see FIG. 7a) to be provided on a substrate (SUB2) in a subsequent process, and a non-light-emitting region (NPXA) surrounding the first to third light-emitting regions (PXA1, PXA2, PXA3).

[0177] FIG. 9a illustrates a cross-section of a substrate after the color filter formation step (S20, see FIG. 8). Referring to FIG. 9a, first to third color filters (CF1, CF2, CF3) can be formed on one side of the substrate (SUB2) provided in the substrate providing step (S10, see FIG. 8). The description regarding the first to third color filters (CF1, CF2, CF3) may be applied in the same manner as the description above.

[0178] Each of the first to third color filters (CF1, CF2, CF3) can be formed by forming a filter layer over the entire area of ​​one surface of the substrate (SUB2) and then patterning using photolithography. However, the process of the first to third color filters (CF1, CF2, CF3) is not limited thereto.

[0179] Referring to FIG. 9a, a third color filter (CF3) may be formed to overlap a third light-emitting region (PXA3) on one side of a substrate (SUB2). A portion of the third color filter (CF3) may overlap a non-light-emitting region (NPXA). The third color filter (CF3) may not overlap the first and second light-emitting regions (PXA1, PXA2).

[0180] Subsequently, a first color filter (CF1) can be formed on a substrate (SUB2) on which a third color filter (CF3) is formed. The first color filter (CF1) can be superimposed on a first light-emitting region (PXA1) and can not be superimposed on the second and third light-emitting regions (PXA2, PXA3). The first color filter (CF1) can be placed on one side of the substrate (SUB2) within the first light-emitting region (PXA1). A portion of the first color filter (CF1) can be superimposed on a non-light-emitting region (NPXA) and can be placed on the third color filter (CF3) within the non-light-emitting region (NPXA).

[0181] Subsequently, a second color filter (CF2) can be formed on a substrate (SUB2) on which the first and third color filters (CF1, CF3) are formed. The second color filter (CF2) can overlap with the second light-emitting region (PXA2) and can not overlap with the first and third light-emitting regions (PXA1, PXA2). The second color filter (CF2) can be placed on one side of the substrate (SUB2) within the second light-emitting region (PXA2). A portion of the second color filter (CF2) can overlap with the non-light-emitting region (NXPA) and can be placed on the first color filter (CF1) within the non-light-emitting region (NPXA).

[0182] The first to third color filters (CF1, CF2, CF3) disposed on the substrate (SUB2) can be defined as a color filter layer (CFL). Meanwhile, the order of formation of the first to third color filters (CF1, CF2, CF3) is not limited to that shown in FIG. 9a.

[0183] A low refractive index layer (LR) can be formed on a substrate (SUB2) on which a color filter layer (CFL) is formed. The low refractive index layer (LR) can be formed by coating, depositing, or printing a composition constituting the low refractive index layer (LR) onto the color filter layer (CFL). The low refractive index layer (LR) can cover one side of the color filter layer (CFL). The low refractive index layer (LR) can be provided as a single layer overlapping the first to third light-emitting regions (PXA1, PXA2, PXA3).

[0184] The first capping layer (CP1) is formed on the low-refractive index layer (LR) and can cover the low-refractive index layer (LR). In one embodiment, the first capping layer (CP1) may be formed by depositing an inorganic material, but is not limited thereto. The first capping layer (CP1) can provide a base surface on which a light control unit (LCP, see FIG. 9f) and light conversion units (WCP1, WCP2, see FIG. 9f) are formed in a subsequent process, and can protect the low-refractive index layer (LR) during the process.

[0185] FIG. 9b shows a cross-section of the substrate after the preliminary light control unit formation step (S30, see FIG. 8). One step of the display device manufacturing method illustrated in FIG. 9b may correspond to one step for forming a light control unit (LCP, see FIG. 9c) from a preliminary light control unit (P-LCP). One step of the display device manufacturing method illustrated in FIG. 9c may correspond to the step (S40, see FIG. 8) of forming a light control unit (LCP) having openings (OP1, OP2) and a recess (RP) from a preliminary light control unit (P-LCP).

[0186] Referring to FIG. 9b, a preliminary light control unit (P-LCP) may be formed on a substrate (SUB2) on which a color filter layer (CFL) and a low-refractive index layer (LR) are disposed. The preliminary light control unit (P-LCP) may be arranged to overlap the first to third light-emitting regions (PXA1, PXA2, PXA3) and the non-light-emitting region (NPXA). The preliminary light control unit (P-LCP) may be formed by applying a base resin (BR) in which scatterers (SP) are dispersed onto a first capping layer (CP1) by means such as coating, deposition, or printing. In this case, the scatterers (SP) may be dispersed at a uniform density throughout the base resin (BR) without being concentrated in specific areas.

[0187] To pattern the preliminary light control unit (P-LCP), a photoresist layer (PR) may be formed on the preliminary light control unit (P-LCP). The photoresist layer (PR) may include a photosensitive material whose physical properties change upon exposure to light. A mask (MK) may be provided on the photoresist layer (PR), comprising mask openings (OP-M1, OP-M2), a light-blocking portion (BL), and a semi-transparent portion (HFT). Some of the mask openings (OP-M1, OP-M2) may overlap with a first light-emitting region (PXA1), and the remaining mask openings (OP-M2) may overlap with a second light-emitting region (PXA2). The semitransparent portion (HFT) of the mask (MK) can be superimposed on the third light-emitting region (PXA3), and the light-blocking portion (BL) of the mask (MK) can be superimposed on the non-light-emitting region (NPXA).

[0188] After providing a mask (MK), an exposure process can be performed to irradiate light onto the mask (MK). Light passing through the mask openings (OP-M1, OP-M2) is irradiated onto parts of the photoresist layer (PR) that overlap the mask openings (OP-M1, OP-M2), thereby changing the physical properties of said parts of the photoresist layer (PR).

[0189] Referring to FIGS. 9b and 9c, parts of the photoresist layer (PR) overlapping the mask openings (OP-M1, OP-M2) can be removed by a developer provided in a development process, and parts of the preliminary light control unit (P-LCP) overlapping the mask openings (OP-M1, OP-M2) can be exposed. The exposed parts of the preliminary light control unit (P-LCP) can be etched by an etching process, and the first and second openings (OP1, OP2) shown in FIG. 9c can be formed. The first opening (OP1) can overlap the first light-emitting region (PXA1), and the second opening (OP2) can overlap the second light-emitting region (PXA2). The first and second openings (OP1, OP2) can be formed by penetrating the light control unit (LCP), and thus, the light control unit (LCP) can be non-overlapping with the first and second light-emitting regions (PXA1, PXA2).

[0190] The width of each of the first and second openings (OP1, OP2) may increase as it approaches the substrate (SUB2) in cross-section. Accordingly, the width of the first part (P1) positioned between the first opening (OP) and the second opening (OP) in cross-section may decrease as it approaches the upper substrate (SUB2). The first part (P1) may have a trapezoidal shape in cross-section. However, the shape of the first part (P1) is not necessarily limited to this.

[0191] The light-blocking portion (BL) of the mask (MK) can block light provided on the mask (MK), and light may not be irradiated on a portion of the photoresist layer (PR) superimposed on the light-blocking portion (BL). Therefore, even after the development process, a portion of the photoresist layer (PR) superimposed on the light-blocking portion (BL) may remain on the preliminary light control portion (P-LCP). A portion of the preliminary light control portion (P-LCP) superimposed on the light-blocking portion (BL) may be formed as a first portion (P1) of the light control portion (LCP) after the photolithography process. The first portion (P1) of the light control portion (LCP) may be superimposed on a non-emissive region (NPXA).

[0192] The semitransparent portion (HFT) of the mask (MK) may be a portion where the amount of light transmitted is greater than that of the blocking portion (BL) and smaller than that of the mask openings (OP-M1, OP-M2). By including the light-blocking portion (BL) and the semitransparent portion (HFT) of the mask (MK), light can be irradiated differentially according to the area of ​​the photoresist layer (PR), and subsequently, through the development and etching processes, a light control portion (LCP) with a different thickness in one part can be formed.

[0193] A preliminary light control section (P-LCP) superimposed on the semi-transparent section (HFT) of the mask (MK) may have a portion etched in the thickness direction, and a recess (RP) may be formed by being superimposed on the third light-emitting region (PXA3) and provided by being recessed from one side of the preliminary light control section (P-LCP). That is, by utilizing the semi-transparent section (HFT) of the mask (MK), a second part (P2) having a thickness (TH) smaller than the thickness (P-TH, see FIG. 9b) of the preliminary light control section (P-LCP) superimposed on the third light-emitting region (PXA3) may be formed. As a result, one side (S1) of the first part (P1) and the second side (S2) of the second part (P2) may form a step. The description regarding the first part (P1) and the second part (P2) may be applied in the same way as the description above.

[0194] In cross-section, the width of the recess (RP) may increase as it approaches the upper substrate (SUB2). However, the embodiment is not necessarily limited to this, and the shape of the recess (RP) may be modified depending on the process conditions.

[0195] The thickness (TH) of the second part (P2) can be controlled by adjusting the formation conditions of the second part (P2), such as the light transmittance of the semi-transparent part (HFT) and etching conditions. The method for manufacturing a display device according to the present invention can form the second part (P2) such that the thickness (TH) of the second part (P2) is smaller than the width (WD) of the first part (P1). By having the thickness (TH) of the second part (P2) have a value smaller than the width (WD) of the first part (P1), color mixing within the non-emissive region (NPXA) can be prevented, and a light control unit (LCP) with improved light emission efficiency in the third emissive region (PXA3) can be provided.

[0196] Meanwhile, although the description was based on a positive photo process in which etching occurs in correspondence with the mask opening of the mask (MK), it is not limited thereto, and the light control unit (LCP) may also be formed using a negative photo process in which a pattern is formed in a portion corresponding to the mask opening of the mask (MK).

[0197] The first part (P1) and the second part (P2) can be simultaneously formed from a preliminary light control unit (P-LCP) through a photolithography process using a single mask (MK). The first part (P1) overlapping the non-emissive region (NPXA) and the second part (P2) overlapping the third emissive region (PXA3) can be formed integrally. Additionally, a light control unit (LCP) including the first part (P1) and the second part (P2) forming a step difference with the first part (P1) can be formed using a single mask (MK). Therefore, a light control unit (LCP) having both the functions of a barrier and a light-transmitting unit can be formed without adding a mask or a separate barrier formation process. As a result, the manufacturing process of the display device can be simplified.

[0198] If the light control unit is formed using an inkjet in areas corresponding to the third light-emitting regions (PXA3), scatterers (SP) may settle before being applied to the substrate (SUB2) due to the inkjet ejection waiting time. This may cause a problem in which the density of scatterers (SP) varies depending on the area where the light control unit (LCP) is formed. Non-uniformity in the density of scatterers (SP) may cause a problem of non-uniformity in brightness of the third light-emitting region (PXA3) that overlaps with the light control unit. As a result, a problem may occur in which stains are visible within the display area of ​​the display device, and the reliability of the display device may be reduced.

[0199] However, the light control unit (LCP) manufactured through the method for manufacturing a display device according to one embodiment of the present invention can be formed so that scatterers (SP) have a uniform density in the portions overlapping the third light-emitting regions (PXA3). Accordingly, the problem of luminance non-uniformity and stain visibility caused by non-uniformity in the density of scatterers (SP) can be prevented, and the reliability of the display device can be improved.

[0200] FIGS. 9d and FIGS. 9e illustrate steps (S50, see FIG. 8) for forming the first and second light conversion units (WCP1, WCP2).

[0201] Referring to FIG. 9d, a first nozzle (NZ1) may be provided on a first opening (OP1) that overlaps with a first light-emitting region (PXA1). The first nozzle (NZ1) may discharge a first ink (INK1) into the first opening (OP1). The first ink (INK1) may include a composition constituting a first light-converting unit (WCP1). For example, the first ink (INK1) may include a base resin (BR1) in which first quantum dots (QD1) are dispersed. Not limited thereto, the first ink (INK1) may further include scatterers dispersed in the base resin (BR1).

[0202] Referring to FIG. 9e, a second nozzle (NZ2) may be provided on a second opening (OP2) that overlaps with a second light-emitting region (PXA2). The second nozzle (NZ2) may discharge a second ink (INK2) into the second opening (OP2). The second ink (INK2) may include a composition constituting a second light-converting unit (WCP2). For example, the second ink (INK2) may include a base resin (BR2) in which second quantum dots (QD2) are dispersed. Not limited thereto, the second ink (INK2) may further include scatterers dispersed in the base resin (BR2).

[0203] FIG. 9f illustrates a cross-section of a substrate having an optical control unit (LCP) and optical conversion units (WCP1, WCP2) formed thereon. Referring to FIG. 9f, the optical control unit (LCP) and the first and second optical conversion units (WCP1, WCP2), respectively disposed in the first and second openings (OP1, OP2), can be defined as an optical conversion layer (LCL). The description of each component may be applied in the same manner as the description above. Meanwhile, although not separately illustrated, a method for manufacturing a display device according to one embodiment may further include the step of forming a second capping layer (CP2, FIG. 7a) on the optical conversion layer (LCL).

[0204] A substrate (SUB2) on which a color filter layer (CFL) and a light conversion layer (LCL) are disposed may correspond to a light control member (LCM). A display panel (DP, see FIG. 7a) may be provided on the light control member (LCM) such that the light conversion layer (LCL) and the display panel (DP, see FIG. 7a) face each other. A display panel (DP, see FIG. 7a) may be aligned on the light control member (LCM) such that a first color filter (CF1) and a first light conversion unit (WCP1) overlap on a first light-emitting element (OL1, see FIG. 7a), a second color filter (CF2) and a second light conversion unit (WCP2) overlap on a second light-emitting element (OL2, see FIG. 7a), and a third color filter (CF3) and a light control unit (LCP) overlap on a third light-emitting element (OL3, see FIG. 7a). Subsequently, the light control member (LCM) and the display panel (DP, see FIG. 7a) can be bonded together to manufacture the display device of the present invention.

[0205] A display device according to one embodiment of the present invention includes a light control unit in which the thickness of the portion overlapping the light-emitting region is smaller than the width of the portion overlapping the non-light-emitting region, thereby preventing color mixing in the non-light-emitting region and simultaneously providing a light control unit with improved light emission efficiency in the light-emitting region. By providing scatterers within parts of the light control unit overlapping the light-emitting regions to have a substantially uniform density, the problem of non-uniformity in brightness between light-emitting regions caused by non-uniformity in the density of scatterers can be prevented. Through this, the problem of stains being visible or yellowing occurring within the display area of ​​the display device can be prevented, and the reliability of the display device can be improved.

[0206] A method for manufacturing a display device according to one embodiment of the present invention can form a light control unit using a single mask, wherein the thickness of the portion overlapping the light-emitting region is smaller than the width of the portion overlapping the non-light-emitting region. This allows for the omission of a process for forming a separate partition and enables the formation of a light control unit with substantially uniform scatterer density. A method for manufacturing a display device according to one embodiment of the present invention can provide a display device with improved reliability through a simplified process.

[0207] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art or those with ordinary knowledge in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and technical scope of the invention as described in the claims set forth below.

[0208] Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims. Explanation of the symbols

[0209] DD: Display device DP: Display panel DP-CL: Circuit layer DP-OL: Display element layer OL1, OL2, OL3: Light-emitting elements PDL: Pixel defining layer PX-OP: Light-emitting aperture PXA1, PXA2, PXA3: Light-emitting region NPXA: Non-luminous region LCM: Light control element SUB2: Upper substrate CF1, CF2, CF3: Color filters WCP1, WCP2: Optical converter LCP: Optical control unit P1: Part 1 P2: Part 2 BR1, BR2, BR3: Base resin QD1, QD2: Quantum dots OP1, OP2: Openings RP: Depression

Claims

Claim 1 A display device comprising: a plurality of light-emitting elements each providing source light and arranged along one direction, divided into first to third light-emitting regions corresponding to each of the light-emitting elements and a non-light-emitting region surrounding the first to third light-emitting regions; a light control unit disposed on the display device layer and having openings defined that overlap each of the first and second light-emitting regions, and comprising a base resin and a scatterer; light conversion units disposed on each of the openings and comprising quantum dots; and first to third color filters disposed on the light control unit and the light conversion units and overlapping each of the first to third light-emitting regions, wherein the light control unit comprises a first portion overlapping the non-light-emitting region; and a second portion overlapping the third light-emitting region, composed of the same material as the first portion, and forming a step difference with the first portion, wherein the width of the first portion in the one direction is greater than the thickness of the second portion, and the thickness of the second portion is smaller than the thickness of each of the light conversion units. Claim 2 A display device according to claim 1, wherein the width of the first part corresponds to the gap between one end of the first part defining an opening disposed adjacent to the second part on a plane and the other end of the first part forming the step. Claim 3 delete Claim 4 A display device according to claim 1, wherein the difference between the width of the first part and the thickness of the second part is 6 μm or more. Claim 5 A display device according to claim 1, wherein each of the first part and the second part includes a first surface facing the display element layer, and in the thickness direction, the first surface of the second part is further spaced from the display element layer than the first surface of the first part. Claim 6 In claim 1, the first part is a display device that surrounds the second part on a plane. Claim 7 In claim 1, the light control unit is a display device that surrounds the light conversion units on a plane. Claim 8 A display device according to claim 1, wherein at least two of the first to third color filters overlap each other in the non-luminous region. Claim 9 In claim 1, the first to third color filters are a display device having different colors from each other. Claim 10 A display device according to claim 9, wherein the light conversion units include: a first light conversion unit that overlaps the first light-emitting region and includes a first quantum dot that converts the source light into a first light; and a second light conversion unit that overlaps the second light-emitting region and includes a second quantum dot that converts the source light into a second light different from the first light, wherein the first light conversion unit overlaps the first color filter, the second light conversion unit overlaps the second color filter, and the light control unit overlaps the third color filter. Claim 11 A display device according to claim 10, wherein at least one of the first light conversion unit and the second light conversion unit further comprises a scatterer. Claim 12 A display device according to claim 1, further comprising a low-refractive index layer disposed between the first to third color filters and the light control unit and covering the first to third color filters. Claim 13 A display device comprising: a display element layer including first to third light-emitting elements, each providing source light; a light control unit disposed on the display element layer, wherein openings overlapping the first and second light-emitting elements and a recess overlapping the third light-emitting element are defined, and the light control unit includes a base resin and a scatterer; light conversion units disposed in the openings and including quantum dots; and first to third color filters overlapping the first to third light-emitting elements, wherein the distance between the recess and the opening adjacent to the recess is greater than the thickness of the portion in which the recess is defined in the light control unit, and the thickness of the portion in which the recess is defined in the light control unit is smaller than the thickness of each of the light conversion units. Claim 14 A display device according to claim 13, wherein the difference between the distance between the recess and the opening adjacent to the recess and the thickness of the portion where the recess is defined in the light control unit is 6 μm or more. Claim 15 In claim 13, the above-mentioned recess is a display device that overlaps with the third color filter. Claim 16 In claim 13, the light control unit is a display device that surrounds the light conversion units on a plane. Claim 17 In claim 13, a display device in which at least two of the first to third color filters overlap each other within the area between the recess and the opening. Claim 18 A method for manufacturing a display device comprising: a step of providing a substrate; a step of forming color filters on the substrate; a step of forming a preliminary light control unit comprising a base resin and a scatterer on the color filters; a step of providing a mask comprising a mask opening, a light-blocking portion, and a semi-transparent portion on the preliminary light control unit to form a light control unit having an opening and a recess; a step of forming a light conversion unit in the opening; and a step of providing a display panel comprising a plurality of light-emitting elements on the light control unit, wherein the opening and the recess are each superimposed on the plurality of light-emitting elements, and the thickness of the portion in which the recess is defined in the light control unit is smaller than the thickness of the light conversion unit. Claim 19 A method for manufacturing a display device in claim 18, wherein the opening and the recess are formed corresponding to the mask opening and the semi-transparent portion, respectively. Claim 20 In claim 18, the above-mentioned light conversion part is formed through an inkjet printing process. A method for manufacturing a display device.

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