Tiled display device

Abstract

The present invention relates to a tile-type display device. A tile-type display device according to one embodiment comprises a plurality of display devices arranged adjacent to each other and each including a plurality of first pixels and a plurality of second pixels, wherein at least one side of the display devices includes a boundary region adjacent to each other and a main region other than the boundary region, wherein the first pixel is arranged in the main region and the second pixel is arranged in the boundary region, wherein the first pixel and the second pixel each include a plurality of subpixels, and the plurality of subpixels of the second pixel include a divided pixel divided into a plurality of parts.

Description

Technology Field

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

[0002] As the information society develops, the demand for display devices for displaying images is increasing in various forms. For example, display devices are being applied to a wide range of electronic devices, such as smartphones, digital cameras, laptop computers, navigation systems, and smart televisions. Display devices may be flat panel display devices, such as Liquid Crystal Display Devices, Field Emission Display Devices, and Organic Light Emitting Display Devices. Among these flat panel display devices, light-emitting display devices include light-emitting elements in which each pixel of the display panel can emit light independently, thereby enabling the display of images without a backlight unit that provides light to the display panel.

[0003] When manufacturing display devices in large sizes, the defect rate of light-emitting elements may increase due to the increase in the number of pixels, and productivity or reliability may decrease. To address this, a tile-type display device can realize a large screen by connecting multiple display devices having relatively small sizes. A tile-type display device aligns multiple display devices adjacent to each other so that they can be perceived as a single large display device. The problem to be solved

[0004] The problem that the present invention aims to solve is to provide a tile-type display device that can improve visibility of the boundaries of a display device even when there is a difference in the alignment of a plurality of display devices.

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

[0006] A tile-type display device according to one embodiment for solving the above problem comprises a plurality of display devices arranged adjacent to each other and each including a plurality of first pixels and a plurality of second pixels, wherein at least one side of the display devices includes a boundary area adjacent to each other and a main area other than the boundary area, wherein the first pixel is placed in the main area and the second pixel is placed in the boundary area, wherein the first pixel and the second pixel each include a plurality of subpixels, and the plurality of subpixels of the second pixel may include a divided pixel divided into a plurality of parts.

[0007] The subpixels included in the first pixel and the second pixel, respectively, emit different colors and may include the first subpixel, the second subpixel, and the third subpixel that are adjacent to each other.

[0008] The first subpixel, the second subpixel, and the third subpixel each emit the same color and include adjacent divided pixels, and the divided pixels include a first divided pixel and a second divided pixel adjacent in the short axis direction of the first subpixel, and may further include a third divided pixel disposed on one side of the first divided pixel and a fourth divided pixel disposed on the other side of the first divided pixel in the long axis direction of the first subpixel.

[0009] The length of the long side of each of the first divided pixel and the second divided pixel may be the same as the length of the long side of the subpixel of the first pixel.

[0010] The distance from one side of the first divided pixel to the other side of the second divided pixel may be the same as the length of the short side of the sub-pixel of the first pixel.

[0011] The third divided pixel and the fourth divided pixel may be spaced apart from each other with the first divided pixel and the second divided pixel in between.

[0012] The direction in which the long side of each of the third divided pixel and the fourth divided pixel is extended may be parallel to the direction in which the short side of the first divided pixel is extended.

[0013] The length of the long side of each of the third divided pixel and the fourth divided pixel is equal to each other and may be equal to the length of the short side of the subpixel of the first pixel.

[0014] The length of the long side of each of the third divided pixel and the fourth divided pixel may be the same as the distance from one side of the first divided pixel to the other side of the second divided pixel.

[0015] The first divided pixel and the second divided pixel are of the same size, and the third divided pixel and the fourth divided pixel may be of the same size.

[0016] The size of each of the first divided pixel and the second divided pixel may be larger than the size of each of the third divided pixel and the fourth divided pixel.

[0017] Additionally, a tile-type display device according to one embodiment comprises a first display device and a second display device arranged adjacently in one direction, and each of the first display device and the second display device comprises a first pixel arranged in a main area and a second pixel arranged in a boundary area at the edge of the main area and comprising a plurality of subpixels each having a plurality of divided pixels, wherein at least one of the plurality of divided pixels of the first display device does not emit light, and at least one of the plurality of divided pixels of the second display device may not emit light.

[0018] Each of the above multiple subpixels may include a first divided pixel and a second divided pixel adjacent in the short axis direction of the subpixel, and may include a third divided pixel disposed on one side of the first divided pixel and a fourth divided pixel disposed on the other side of the first divided pixel in the long axis direction of the first divided pixel.

[0019] One side of the first subpixel of the first display device and one side of the first subpixel of the second display device can be aligned with each other on the same line.

[0020] The first display device may not emit light on the third divided pixel and the fourth divided pixel of each of the plurality of subpixels of the second pixel, and the second display device may not emit light on the third divided pixel and the fourth divided pixel of each of the plurality of subpixels of the second pixel.

[0021] The first display device emits light from the first pixel, and the second display device can emit light from the first pixel.

[0022] One side of the first subpixel of the first display device and one side of the first subpixel of the second display device may be misaligned on the same line.

[0023] The plurality of subpixels above may include a first subpixel, a second subpixel, and a third subpixel arranged in one direction.

[0024] The first subpixel of the second pixel of the first display device may not emit light of the first divided pixel, the third divided pixel, and the fourth divided pixel, and the second subpixel and the third subpixel may not emit light of the third divided pixel and the fourth divided pixel, and the first subpixel and the second subpixel of the second pixel of the second display device may not emit light of the third divided pixel and the fourth divided pixel, and the third subpixel may not emit light of the second divided pixel, the third divided pixel, and the fourth divided pixel.

[0025] The plurality of subpixels of the second pixel of the first display device may not emit light from the third divided pixel, and the plurality of subpixels of the second pixel of the second display device may not emit light from the fourth divided pixel.

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

[0027] According to the tile-type display device of the embodiments, a plurality of display devices can realize a tile-type display device with excellent unity by dividing the subpixels of each pixel in adjacent boundary regions into a plurality of divided pixels and emitting light differently depending on whether they are aligned, thereby improving the visibility of boundary regions.

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

[0029] FIG. 1 is a plan view showing a tile-type display device according to one embodiment. FIG. 2 is a plan view showing a display device according to one embodiment. Figure 3 is a cross-sectional view taken along the cutting line I-I' of Figure 2. FIG. 4 is a plan view showing a pixel of a display device according to one embodiment. Figure 5 is a cross-sectional view taken along the cutting line II-II' of Figure 4. FIG. 6 is a drawing showing a light-emitting element according to one embodiment. FIG. 7 is a plan view showing the combined structure of a tile-type display device according to one embodiment. FIG. 8 is a plan view showing a first pixel of a tile-type display device according to one embodiment. FIG. 9 is a plan view showing a second pixel of a tile-type display device according to one embodiment. Figure 10 is an enlarged view schematically showing area A of Figure 7. Figure 11 is an enlarged view schematically showing an example of area A of Figure 7. Figure 12 is an enlarged view schematically showing another example of area A of Figure 7. Figure 13 is an enlarged view schematically showing area B of Figure 7. Figure 14 is an enlarged view schematically showing an example of area B of Figure 7. Figure 15 is an enlarged view schematically showing another example of area B of Figure 7. FIG. 16 is a schematic plan view of another embodiment showing area A of FIG. 7. FIG. 17 is a schematic plan view of another embodiment showing area B of FIG. 7. FIG. 18 is a schematic plan view showing each pixel of a tile-type display device according to a comparative example emitting white light. FIG. 19 is a schematic plan view showing each pixel of a tile-type display device according to an embodiment emitting white light. Specific details for implementing the invention

[0030] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0031] When elements or layers are referred to as being "on" another element or layer, this includes cases where another layer or element is interposed directly on or in the middle of another element. Throughout the specification, the same reference numerals refer to the same components. Shapes, sizes, ratios, angles, numbers, etc., disclosed in the drawings for describing embodiments are exemplary and the invention is not limited to the depicted details.

[0032] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be the second component within the technical scope of the present invention.

[0033] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship.

[0034] Specific embodiments will be described below with reference to the attached drawings.

[0035] FIG. 1 is a plan view showing a tile-type display device according to one embodiment.

[0036] Referring to FIG. 1, a tile-type display device (TD) may include a plurality of display devices (10). The plurality of display devices (10) may be arranged in a grid pattern, but are not limited thereto. The plurality of display devices (10) may be connected in a first direction (X-axis direction) or a second direction (Y-axis direction), and the tile-type display device (TD) may have a specific shape. For example, each of the plurality of display devices (10) may have the same size as each other, but is not limited thereto. As another example, the plurality of display devices (10) may have different sizes.

[0037] Each of the plurality of display devices (10) may have a rectangular shape including a long side and a short side. The plurality of display devices (10) may be arranged such that their long sides or short sides are connected to one another. Some of the display devices (10) may be placed at the edges of the tile-type display device (TD) to form one side of the tile-type display device (TD). Other of the display devices (10) may be placed at the corners of the tile-type display device (TD) to form two adjacent sides of the tile-type display device (TD). Still other of the display devices (10) may be placed inside the tile-type display device (TD) and surrounded by other display devices (10).

[0038] Each of the plurality of display devices (10) may include a display area (DA) and a non-display area (NDA). The display area (DA) may include a plurality of pixels to display an image. The non-display area (NDA) may be placed around the display area (DA) to surround the display area (DA) and may not display an image.

[0039] The tile-type display device (TD) may have a planar shape overall, but is not limited thereto. The tile-type display device (TD) may have a three-dimensional shape to provide a sense of three-dimensionality to the user. For example, when the tile-type display device (TD) has a three-dimensional shape, at least some of the display devices (10) among the plurality of display devices (10) may have a curved shape. As another example, the tile-type display device (TD) may have a three-dimensional shape by each of the plurality of display devices (10) having a planar shape and being connected to each other at a predetermined angle.

[0040] A tile-type display device (TD) can be formed by connecting the non-display areas (NDA) of each adjacent display device (10). Multiple display devices (10) can be connected to each other through a connecting member or an adhesive member. Thus, the non-display areas (NDA) between multiple display devices (10) can be surrounded by adjacent display areas (DA). The distance between the display areas (DA) of each of the multiple display devices (10) can be close enough that the non-display areas (NDA) between the multiple display devices (10) or the boundary portions between the multiple display devices (10) are not perceived by the user. Additionally, the external light reflectance of the display area (DA) of each of the multiple display devices (10) and the external light reflectance of the non-display areas (NDA) between the multiple display devices (10) can be substantially the same. Therefore, the tile-type display device (TD) can eliminate the sense of disconnection between the multiple display devices (10) and improve the immersion of the image by preventing the non-display areas (NDA) or boundary portions between the multiple display devices (10) from being perceived.

[0041] FIG. 2 is a plan view showing a display device according to one embodiment.

[0042] Referring to FIG. 2, the display device (10) may include a plurality of pixels arranged along a plurality of rows and columns in a display area (DA). Each of the plurality of pixels may include a light-emitting region (LA) defined by a pixel defining film, and may emit light having a predetermined peak wavelength through the light-emitting region (LA). For example, the display area (DA) of the display device (10) may include first to third light-emitting regions (LA1, LA2, LA3). Each of the first to third light-emitting regions (LA1, LA2, LA3) may be a region where light generated from a light-emitting element of the display device (10) is emitted to the outside of the display device (10).

[0043] The first to third light-emitting regions (LA1, LA2, LA3) can emit light having a predetermined peak wavelength to the outside of the display device (10). The first light-emitting region (LA1) can emit light of a first color, the second light-emitting region (LA2) can emit light of a second color, and the third light-emitting region (LA3) can emit light of a third color. For example, the first color light may be red light having a peak wavelength in the range of 610 nm to 650 nm, the second color light may be green light having a peak wavelength in the range of 510 nm to 550 nm, and the third color light may be blue light having a peak wavelength in the range of 440 nm to 480 nm, but is not limited thereto.

[0044] The first to third light-emitting regions (LA1, LA2, LA3) may be sequentially and repeatedly arranged along the first direction (X-axis direction) of the display region (DA). For example, the width of the first direction (X-axis direction) of the first light-emitting region (LA1) may be wider than the width of the first direction of the second light-emitting region (LA2), and the width of the first direction of the second light-emitting region (LA2) may be wider than the width of the first direction of the third light-emitting region (LA3). As another example, the width of the first direction (X-axis direction) of the first light-emitting region (LA1), the width of the first direction of the second light-emitting region (LA2), and the width of the first direction of the third light-emitting region (LA3) may be substantially the same.

[0045] For example, the area of ​​the first light-emitting region (LA1) may be larger than the area of ​​the second light-emitting region (LA2), and the area of ​​the second light-emitting region (LA2) may be larger than the area of ​​the third light-emitting region (LA3). As another example, the area of ​​the first light-emitting region (LA1), the area of ​​the second light-emitting region (LA2), and the area of ​​the third light-emitting region (LA3) may be substantially the same.

[0046] A display area (DA) of a display device (10) may include a plurality of light-blocking areas (BA) surrounding a plurality of light-emitting areas (LA). For example, the display area (DA) may include first to third light-blocking areas (BA1, BA2, BA3). Each of the first to third light-blocking areas (BA1, BA2, BA3) may be disposed on one side of each of the first to third light-emitting areas (LA1, LA2, LA3) and may prevent the mixing of light emitted from the first to third light-emitting areas (LA1, LA2, LA3).

[0047] Figure 3 is a cross-sectional view taken along the cutting line I-I' of Figure 2.

[0048] Referring to FIG. 3, the display area (DA) of the display device (10) may include first to third light-emitting areas (LA1, LA2, LA3). Each of the first to third light-emitting areas (LA1, LA2, LA3) may be an area where light generated from a light-emitting diode (ED) of the display device (10) is emitted to the outside of the display device (10).

[0049] The display device (10) may include a substrate (SUB), a buffer layer (BF), a thin film transistor layer (TFTL), a light-emitting element layer (EML), a wavelength conversion layer (WLCL), a color filter layer (CFL), and an encapsulation layer (TFE).

[0050] The substrate (SUB) may be a base substrate or a base member and may be made of an insulating material such as a polymer resin. For example, the substrate (SUB) may be a flexible substrate capable of bending, folding, rolling, etc. The substrate (SUB) may include polyimide (PI), but is not limited thereto.

[0051] A buffer layer (BF) may be disposed on a substrate (SUB). The buffer layer (BF) may be made of an inorganic film capable of preventing the penetration of air or moisture. For example, the buffer layer (BF) may include a plurality of inorganic films stacked alternately.

[0052] The thin film transistor layer (TFTL) may include a thin film transistor (TFT), a gate insulating layer (GI), an interlayer insulating layer (ILD), a connecting electrode (CNE), a first protective layer (PAS1), and a first planarization layer (OC1).

[0053] A thin-film transistor (TFT) can be placed on a buffer layer (BF) and can constitute a pixel circuit for each of a plurality of pixels. For example, the thin-film transistor (TFT) may be a driving transistor or a switching transistor of a pixel circuit. The thin-film transistor (TFT) may include a semiconductor region (ACT), a gate electrode (GE), a source electrode (SE), and a drain electrode (DE).

[0054] A semiconductor region (ACT), a source electrode (SE), and a drain electrode (DE) may be disposed on a buffer layer (BF). The semiconductor region (ACT) may overlap with the gate electrode (GE) in the thickness direction and may be insulated from the gate electrode (GE) by a gate insulating film (GI). The source electrode (SE) and the drain electrode (DE) may be formed by making the material of the semiconductor region (ACT) conductive.

[0055] The gate electrode (GE) can be placed on top of the gate insulating film (GI). The gate electrode (GE) can overlap with the semiconductor region (ACT) with the gate insulating film (GI) in between.

[0056] A gate insulating film (GI) may be provided on top of a semiconductor region (ACT), a source electrode (SE), and a drain electrode (DE). For example, the gate insulating film (GI) may cover the semiconductor region (ACT), the source electrode (SE), the drain electrode (DE), and a buffer layer (BF), and may insulate the semiconductor region (ACT) from the gate electrode (GE). The gate insulating film (GI) may include a contact hole through which a connecting electrode (CNE) passes.

[0057] An interlayer insulating film (ILD) may be placed on top of a gate electrode (GE). For example, the interlayer insulating film (ILD) may include a contact hole through which a connecting electrode (CNE) passes. Here, the contact hole of the interlayer insulating film (ILD) may be connected to a contact hole of the gate insulating film (GI).

[0058] A connecting electrode (CNE) can be placed on an interlayer insulating film (ILD). The connecting electrode (CNE) can connect the drain electrode (DE) of a thin-film transistor (TFT) and the first electrode (AE) of a light-emitting element (EL). The connecting electrode (CNE) can be contacted to the drain electrode (DE) through a contact hole provided in the gate insulating film (GI) and the interlayer insulating film (ILD).

[0059] A first protective layer (PAS1) is provided on top of a connecting electrode (CNE) to protect a thin-film transistor (TFT). For example, the first protective layer (PAS1) may include a contact hole through which a first electrode (AE) of a light-emitting element (EL) passes.

[0060] A first flattening layer (OC1) is provided on top of a first protection layer (PAS1) to flatten the top of a thin-film transistor layer (TFTL). For example, the first flattening layer (OC1) may include a contact hole through which a first electrode (AE) of a light-emitting element (EL) passes. Here, the contact hole of the first flattening layer (OC1) may be connected to the contact hole of the first protection layer (PAS1).

[0061] The light-emitting element layer (EML) may include a light-emitting element (EL), a first bank (BNK1), a second bank (BNK2), a second protective layer (PAS2), and a second planarization layer (OC2).

[0062] A light-emitting element (EL) may be provided on a thin-film transistor (TFT). The light-emitting element (EL) may include a first electrode (AE), a second electrode (CE), and a light-emitting diode (ED).

[0063] The first electrode (AE) may be provided on the upper portion of the first planarization layer (OC1). For example, the first electrode (AE) may be placed on the first bank (BNK1) disposed on the first planarization layer (OC1) to cover the first bank (BNK1). The first electrode (AE) may be placed to overlap with one of the first to third light-emitting regions (LA1, LA2, LA3) defined by the second bank (BNK2). Additionally, the first electrode (AE) may be connected to the drain electrode (DE) of the thin-film transistor (TFT). The first electrode (AE) may be the anode electrode of the light-emitting element (EL), but is not limited thereto.

[0064] The second electrode (CE) may be positioned above the first planarization layer (OC1) and spaced apart from the first electrode (AE). For example, the second electrode (CE) may be positioned on the first bank (BNK1) placed on the first planarization layer (OC1) to cover the first bank (BNK1). The second electrode (CE) may be positioned to overlap with one of the first to third light-emitting regions (LA1, LA2, LA3) defined by the second bank (BNK2). For example, the second electrode (CE) may receive a common voltage supplied to the entire pixel. The second electrode (CE) may be the cathode electrode of the light-emitting element (EL), but is not limited thereto.

[0065] The first insulating layer (IL1) can cover a portion of the first electrode (AE) and a portion of the second electrode (CE) that are adjacent to each other, and can insulate the first electrode (AE) and the second electrode (CE).

[0066] A light-emitting diode (ED) may be disposed between a first electrode (AE) and a second electrode (CE) on top of a first planarization layer (OC1). A light-emitting diode (ED) may be disposed on a first insulating layer (IL1). One end of the light-emitting diode (ED) may be connected to the first electrode (AE), and the other end of the light-emitting diode (ED) may be connected to the second electrode (CE). For example, a plurality of light-emitting diodes (ED) may include an active layer having the same material and may emit light of the same wavelength range or light of the same color. The light emitted from each of the first to third light-emitting regions (LA1, LA2, LA3) may have the same color. For example, a plurality of light-emitting diodes (ED) may emit light of the third color or blue light having a peak wavelength in the range of 440 nm to 480 nm. Accordingly, the light-emitting element layer (EML) may emit light of the third color or blue light.

[0067] A second bank (BNK2) may be disposed on the first planarization layer (OC1) to define first to third light-emitting regions (LA1, LA2, LA3). For example, the second bank (BNK2) may surround each of the first to third light-emitting regions (LA1, LA2, LA3), but is not limited thereto. The second bank (BNK2) may separate and insulate the first electrode (AE) or the second electrode (CE) of each of the plurality of light-emitting elements (EL). The second bank (BNK2) may be disposed in the first to third light-blocking regions (BA1, BA2, BA3).

[0068] The second protective layer (PAS2) may be disposed on a plurality of light-emitting elements (EL) and a second bank (BNK2). The second protective layer (PAS2) may cover the plurality of light-emitting elements (EL) and protect the plurality of light-emitting elements (EL). The second protective layer (PAS2) may prevent damage to the plurality of light-emitting elements (EL) by preventing the penetration of impurities, such as moisture or air, from the outside.

[0069] A second planarization layer (OC2) is provided on the second protective layer (PAS2) to planarize the top of the light-emitting element layer (EML). The second planarization layer (OC2) may include an organic material. For example, the second planarization layer (OC2) may include at least one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin.

[0070] The wavelength conversion layer (WLCL) may include a first capping layer (CAP1), a first light-blocking member (BK1), a first wavelength conversion unit (WLC1), a second wavelength conversion unit (WLC2), a light-transmitting unit (LTU), a second capping layer (CAP2), and a third flattening layer (OC3).

[0071] The first capping layer (CAP1) may be disposed on the second planarization layer (OC2) of the light-emitting element layer (EML). The first capping layer (CAP1) may seal the lower surface of the first and second wavelength conversion units (WLC1, WLC2) and the light transmission unit (LTU). The first capping layer (CAP1) may include an inorganic material. For example, the first capping layer (CAP1) may include at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and silicon oxynitride.

[0072] The first light-blocking member (BK1) may be placed in the first to third light-blocking regions (BA1, BA2, BA3) on the first capping layer (CAP1). The first light-blocking member (BK1) may overlap with the second bank (BNK2) in the thickness direction. The first light-blocking member (BK1) can block the transmission of light. The first light-blocking member (BK1) can improve color reproduction by preventing light from intruding and mixing between the first to third light-emitting regions (LA1, LA2, LA3). The first light-blocking member (BK1) may be arranged in a grid shape surrounding the first to third light-emitting regions (LA1, LA2, LA3) on a plane.

[0073] The first light-blocking member (BK1) may include an organic light-blocking material and a liquid-repellent component. Here, the liquid-repellent component may be composed of a fluorine-containing monomer or a fluorine-containing polymer, and specifically may include a fluorine-containing aliphatic polycarbonate. For example, the first light-blocking member (BK1) may be composed of a black organic material containing the liquid-repellent component. The first light-blocking member (BK1) may be formed through a coating and exposure process, etc., of an organic light-blocking material containing the liquid-repellent component.

[0074] The first light-blocking member (BK1) can separate the first and second wavelength conversion sections (WLC1, WLC2) and the light transmission section (LTU) into corresponding light-emitting regions (LA) by including a liquid-repellent component. For example, if the first and second wavelength conversion sections (WLC1, WLC2) and the light transmission section (LTU) are formed by an inkjet method, an ink composition may flow on the upper surface of the first light-blocking member (BK1). In this case, the first light-blocking member (BK1) can induce the ink composition to flow into each light-emitting region by including a liquid-repellent component. Therefore, the first light-blocking member (BK1) can prevent the ink composition from mixing.

[0075] A first wavelength conversion unit (WLC1) may be disposed in a first light-emitting region (LA1) on a first capping layer (CAP1). The first wavelength conversion unit (WLC1) may be surrounded by a first light-blocking member (BK1). The first wavelength conversion unit (WLC1) may include a first base resin (BS1), a first scatterer (SCT1), and a first wavelength shifter (WLS1).

[0076] The first base resin (BS1) may include a material with a relatively high light transmittance. The first base resin (BS1) may be made of a transparent organic material. For example, the first base resin (BS1) may include at least one of organic materials such as an epoxy resin, an acrylic resin, a cardo resin, and an imide resin.

[0077] The first scatterer (SCT1) may have a refractive index different from that of the first base resin (BS1) and may form an optical interface with the first base resin (BS1). For example, the first scatterer (SCT1) may include a light-scattering material or light-scattering particles that scatter at least a portion of the transmitted light. For example, the first scatterer (SCT1) may include metal oxides such as titanium oxide (TiO2), zirconium oxide (ZrO2), aluminum oxide (Al2O3), indium oxide (In2O3), zinc oxide (ZnO), or tin oxide (SnO2), or may include organic particles such as acrylic resin or urethane resin. The first scatterer (SCT1) may scatter light in random directions regardless of the incident direction of the incident light without substantially changing the peak wavelength of the incident light.

[0078] The first wavelength shifter (WLS1) can convert or shift the peak wavelength of incident light to the first peak wavelength. For example, the first wavelength shifter (WLS1) can convert and emit blue light provided by the display device (10) into red light having a single peak wavelength in the range of 610 nm to 650 nm. The first wavelength shifter (WLS1) may be a quantum dot, a quantum rod, or a phosphor. A quantum dot may be a particulate material that emits a specific color as electrons transition from the conduction band to the valence band.

[0079] For example, quantum dots can be semiconductor nanocrystalline materials. Depending on their composition and size, quantum dots can have a specific band gap and emit light with a specific wavelength after absorbing light. Examples of semiconductor nanocrystalline quantum dots include group IV nanocrystals, group II-VI compound nanocrystals, group III-V compound nanocrystals, group IV-VI nanocrystals, or combinations thereof.

[0080] For example, a quantum dot may have a core-shell structure comprising a core containing the aforementioned nanocrystal and a shell surrounding the core. The shell of the quantum dot may serve as a protective layer to maintain semiconductor properties by preventing chemical degradation of the core, and 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. The shell of the quantum dot may be composed of metal or non-metal oxides, semiconductor compounds, or combinations thereof.

[0081] The light emitted by the first wavelength shifter (WLS1) may have a Full Width of Half Maximum (FWHM) of the emission wavelength spectrum of 45 nm or less, 40 nm or less, or 30 nm or less, and the color purity and color reproducibility of the color displayed by the display device (10) can be further improved. The light emitted by the first wavelength shifter (WLS1) may be emitted in multiple directions regardless of the incident direction of the incident light. Accordingly, the side visibility of red displayed in the first emission region (LA1) can be improved.

[0082] A portion of the blue light provided by the light-emitting element layer (EML) may pass through the first wavelength conversion unit (WLC1) without being converted into red light by the first wavelength shifter (WLS1). Among the blue light provided by the light-emitting element layer (EML), the light incident on the first color filter (CF1) without being converted by the first wavelength conversion unit (WLC1) may be blocked by the first color filter (CF1). Furthermore, among the blue light provided by the light-emitting element layer (EML), the red light converted by the first wavelength conversion unit (WLC1) may pass through the first color filter (CF1) and be emitted to the outside. Therefore, the first light-emitting region (LA1) may emit red light.

[0083] The second wavelength converter (WLC2) may be disposed in the second light-emitting region (LA2) on the first capping layer (CAP1). The second wavelength converter (WLC2) may be surrounded by the first light-blocking member (BK1). The second wavelength converter (WLC2) may include a second base resin (BS2), a second scatterer (SCT2), and a second wavelength shifter (WLS2).

[0084] The second base resin (BS2) may include a material with relatively high light transmittance. The second base resin (BS2) may be made of a transparent organic material. For example, the second base resin (BS2) may be made of the same material as the first base resin (BS1) or may be made of the material exemplified in the first base resin (BS1).

[0085] The second scatterer (SCT2) may have a refractive index different from that of the second base resin (BS2) and may form an optical interface with the second base resin (BS2). For example, the second scatterer (SCT2) may include a light-scattering material or light-scattering particles that scatter at least a portion of the transmitted light. For example, the second scatterer (SCT2) may be made of the same material as the first scatterer (SCT1) or may be made of the material exemplified in the first scatterer (SCT1). The second scatterer (SCT2) may scatter light in random directions regardless of the incident direction of the incident light without substantially changing the peak wavelength of the incident light.

[0086] The second wavelength shifter (WLS2) can convert or shift the peak wavelength of incident light to a second peak wavelength different from the first peak wavelength of the first wavelength shifter (WLS1). For example, the second wavelength shifter (WLS2) can convert and emit blue light provided by the display device (10) into green light having a single peak wavelength in the range of 510 nm to 550 nm. The second wavelength shifter (WLS2) may be a quantum dot, a quantum rod, or a phosphor. The second wavelength shifter (WLS2) may include a material of the same nature as the material exemplified in the first wavelength shifter (WLS1). The wavelength conversion range of the second wavelength shifter (WLS2) may be made of a quantum dot, a quantum rod, or a phosphor such that it is different from the wavelength conversion range of the first wavelength shifter (WLS1).

[0087] The light-transmitting unit (LTU) may be disposed in a third light-emitting region (LA3) on the first capping layer (CAP1). The light-transmitting unit (LTU) may be surrounded by a first light-blocking member (BK1). The light-transmitting unit (LTU) may transmit while maintaining the peak wavelength of the incident light. The light-transmitting unit (LTU) may include a third base resin (BS3) and a third scatterer (SCT3).

[0088] The third base resin (BS3) may include a material with relatively high light transmittance. The third base resin (BS3) may be made of a transparent organic material. For example, the third base resin (BS3) may be made of the same material as the first or second base resin (BS1, BS2), or may be made of the material exemplified in the first or second base resin (BS1, BS2).

[0089] The third scatterer (SCT3) may have a refractive index different from that of the third base resin (BS3) and may form an optical interface with the third base resin (BS3). For example, the third scatterer (SCT3) may include a light-scattering material or light-scattering particles that scatter at least a portion of the transmitted light. For example, the third scatterer (SCT3) may be made of the same material as the first or second scatterer (SCT1, SCT2) or may be made of the material exemplified in the first or second scatterer (SCT1, SCT2). The third scatterer (SCT3) may scatter light in random directions regardless of the incident direction of the incident light without substantially changing the peak wavelength of the incident light.

[0090] Since the wavelength conversion layer (WLCL) is placed directly on the second planarization layer (OC2) of the light-emitting element layer (EML), the display device (10) may not require a separate substrate for the first and second wavelength conversion sections (WLC1, WLC2) and the light transmission section (LTU). Accordingly, the first and second wavelength conversion sections (WLC1, WLC2) and the light transmission section (LTU) can be easily aligned with each of the first to third light-emitting regions (LA1, LA2, LA3), and the thickness of the display device (10) can be relatively reduced.

[0091] The second capping layer (CAP2) may cover the first and second wavelength conversion sections (WLC1, WLC2), the light transmission section (LTU), and the first light-blocking member (BK1). For example, the second capping layer (CAP2) may seal the first and second wavelength conversion sections (WLC1, WLC2) and the light transmission section (LTU) to prevent damage or contamination of the first and second wavelength conversion sections (WLC1, WLC2) and the light transmission section (LTU). The second capping layer (CAP2) may be made of the same material as the first capping layer (CAP1) or may be made of the material exemplified in the first capping layer (CAP1).

[0092] The third flattening layer (OC3) is disposed on top of the second capping layer (CAP2) to flatten the top of the first and second wavelength conversion sections (WLC1, WLC2) and the light transmission section (LTU). The third flattening layer (OC3) may include an organic material. For example, the third flattening layer (OC3) may include at least one of acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin.

[0093] The color filter layer (CFL) may include a second light-blocking member (BK2), first to third color filters (CF1, CF2, CF3), and a third protective layer (PAS3).

[0094] The second light-blocking member (BK2) may be disposed on the third planarization layer (OC3) of the wavelength conversion layer (WLCL) in the first to third light-blocking regions (BA1, BA2, BA3). The second light-blocking member (BK2) may overlap with the first light-blocking member (BK1) or the second bank (BNK2) in the thickness direction. The second light-blocking member (BK2) can block the transmission of light. The second light-blocking member (BK2) can improve color reproduction by preventing light from intruding and mixing between the first to third light-emitting regions (LA1, LA2, LA3). The second light-blocking member (BK2) may be disposed in a grid shape surrounding the first to third light-emitting regions (LA1, LA2, LA3) on a plane.

[0095] A first color filter (CF1) may be placed in a first light-emitting region (LA1) on a third planarization layer (OC3). The first color filter (CF1) may be surrounded by a second light-blocking member (BK2). The first color filter (CF1) may overlap with the first wavelength conversion unit (WLC1) in the thickness direction. The first color filter (CF1) may selectively transmit light of a first color (e.g., red light) and block or absorb light of a second color (e.g., green light) and light of a third color (e.g., blue light). For example, the first color filter (CF1) may be a red color filter and may include a red colorant. The red colorant may consist of a red dye or a red pigment.

[0096] The second color filter (CF2) may be placed in the second light-emitting region (LA2) on the third planarization layer (OC3). The second color filter (CF2) may be surrounded by a second light-blocking member (BK2). The second color filter (CF2) may overlap with the second wavelength conversion unit (WLC2) in the thickness direction. The second color filter (CF2) may selectively transmit light of the second color (e.g., green light) and block or absorb light of the first color (e.g., red light) and light of the third color (e.g., blue light). For example, the second color filter (CF2) may be a green color filter and may include a green colorant. The green colorant may consist of a green dye or a green pigment.

[0097] A third color filter (CF3) may be placed in a third light-emitting region (LA3) on the third planarization layer (OC3). The third color filter (CF3) may be surrounded by a second light-blocking member (BK2). The third color filter (CF3) may overlap with the light-transmitting portion (LTU) in the thickness direction. The third color filter (CF3) may selectively transmit light of a third color (e.g., blue light) and block or absorb light of a first color (e.g., red light) and light of a second color (e.g., green light). For example, the third color filter (CF3) may be a blue color filter and may include a blue colorant. The blue colorant may consist of a blue dye or a blue pigment.

[0098] The first to third color filters (CF1, CF2, CF3) can absorb a portion of the light entering from outside the display device (10) to reduce reflected light caused by external light. Accordingly, the first to third color filters (CF1, CF2, CF3) can prevent color distortion caused by external light reflection.

[0099] Since the first to third color filters (CF1, CF2, CF3) are placed directly on the third planarization layer (OC3) of the wavelength conversion layer (WLCL), the display device (10) may not require a separate substrate for the first to third color filters (CF1, CF2, CF3). Accordingly, the thickness of the display device (10) may be relatively reduced.

[0100] The third protective layer (PAS3) can cover the first to third color filters (CF1, CF2, CF3). The third protective layer (PAS3) can protect the first to third color filters (CF1, CF2, CF3).

[0101] The encapsulation layer (TFE) may be placed on the third protective layer (PAS3) of the color filter layer (CFL). The encapsulation layer (TFE) may cover the upper surface and the side surface of the display layer. For example, the encapsulation layer (TFE) may include at least one inorganic film to prevent oxygen or moisture from penetrating. Additionally, the encapsulation layer (TFE) may include at least one organic film to protect the display device (10) from foreign substances such as dust.

[0102] FIG. 4 is a plan view showing a pixel of a display device according to one embodiment.

[0103] Referring to FIG. 4, each of the plurality of pixels (PX) may include first to third subpixels (SP1, SP2, SP3). Each of the first to third subpixels (SP1, SP2, SP3) may correspond to each of the first to third light-emitting regions (LA1, LA2, LA3). Each of the light-emitting diodes (ED) of the first to third subpixels (SP1, SP2, SP3) may emit light through the first to third light-emitting regions (LA1, LA2, LA3).

[0104] Each of the first to third subpixels (SP1, SP2, SP3) may emit light of the same color. For example, each of the first to third subpixels (SP1, SP2, SP3) may include a light-emitting diode (ED) of the same type and may emit light of the third color or blue light. As another example, the first subpixel (SP1) may emit light of the first color or red light, the second subpixel (SP2) may emit light of the second color or green light, and the third subpixel (SP3) may emit light of the third color or blue light.

[0105] Each of the first to third subpixels (SP1, SP2, SP3) may include first and second electrodes (AE, CE), a light-emitting diode (ED), a plurality of contact electrodes (CTE), and a plurality of second banks (BNK2).

[0106] The first and second electrodes (AE, CE) are electrically connected to a light-emitting diode (ED) to receive a predetermined voltage, and the light-emitting diode (ED) can emit light of a specific wavelength range. At least a portion of the first and second electrodes (AE, CE) can form an electric field within the pixel (PX), and the light-emitting diode (ED) can be aligned by the electric field.

[0107] For example, the first electrode (AE) may be a pixel electrode separated for each of the first to third subpixels (SP1, SP2, SP3), and the second electrode (CE) may be a common electrode connected in common to the first to third subpixels (SP1, SP2, SP3). Either of the first electrode (AE) and the second electrode (CE) may be the anode electrode of the light-emitting diode (ED), and the other may be the cathode electrode of the light-emitting diode (ED).

[0108] The first electrode (AE) may include a first electrode stem portion (AE1) extending in a first direction (X-axis direction) and at least one first electrode branch portion (AE2) branched from the first electrode stem portion (AE1) and extending in the opposite direction of a second direction (Y-axis direction).

[0109] The first electrode stem portion (AE1) of each of the first to third subpixels (SP1, SP2, SP3) may be spaced apart from the first electrode stem portion (AE1) of an adjacent subpixel, and the first electrode stem portion (AE1) may be positioned on a virtual extension line with the first electrode stem portion (AE1) of an adjacent subpixel in the first direction (X-axis direction). The first electrode stem portion (AE1) of each of the first to third subpixels (SP1, SP2, SP3) may receive different signals and may be driven independently.

[0110] The first electrode branch portion (AE2) may be branched from the first electrode stem portion (AE1) and extended in the opposite direction of the second direction (Y-axis direction). One end of the first electrode branch portion (AE2) may be connected to the first electrode stem portion (AE1), and the other end of the first electrode branch portion (AE2) may be spaced apart from the second electrode stem portion (CE1) facing the first electrode stem portion (AE1).

[0111] The second electrode (CE) may include a second electrode stem portion (CE1) extending in a first direction (X-axis direction) and a second electrode branch portion (CE2) branched from the second electrode stem portion (CE1) and extending in a second direction (Y-axis direction). The second electrode stem portion (CE1) of each of the first to third subpixels (SP1, SP2, SP3) may be connected to the second electrode stem portion (CE1) of an adjacent subpixel. The second electrode stem portion (CE1) may extend in the first direction (X-axis direction) and traverse a plurality of pixels (PX). The second electrode stem portion (CE1) may be connected to an outer part of the display area (DA) or a portion extending in one direction from the non-display area (NDA).

[0112] The second electrode branch (CE2) may be spaced apart from and opposite the first electrode branch (AE2). One end of the second electrode branch (CE2) may be connected to the second electrode stem (CE1), and the other end of the second electrode branch (CE2) may be spaced apart from the first electrode stem (AE1).

[0113] The first electrode (AE) can be electrically connected to the thin-film transistor layer (TFTL) of the display device (10) through the first contact hole (CNT1), and the second electrode (CE) can be electrically connected to the thin-film transistor layer (TFTL) of the display device (10) through the second contact hole (CNT2). For example, the first contact hole (CNT1) can be placed in each of the plurality of first electrode stem portions (AE1), and the second contact hole (CNT2) can be placed in the second electrode stem portion (CE1), but is not limited thereto.

[0114] The second bank (BNK2) may be placed at the boundary between multiple pixels (PX). Multiple first electrode stem portions (AE1) may be spaced apart from each other with respect to the second bank (BNK2). The second bank (BNK2) may extend in the second direction (Y-axis direction) and may be placed at the boundary of pixels (SP) arranged in the first direction (X-axis direction). Additionally, the second bank (BNK2) may also be placed at the boundary of pixels (SP) arranged in the second direction (Y-axis direction). The second bank (BNK2) may define the boundary of multiple pixels (PX).

[0115] The second bank (BNK2) can prevent the ink from crossing the boundaries of the pixels (SP) when the ink in which the light-emitting diodes (ED) are dispersed is sprayed during the manufacture of the display device (10). The second bank (BNK2) can separate the ink in which different light-emitting diodes (ED) are dispersed so that they do not mix with each other.

[0116] A light-emitting diode (ED) may be placed between a first electrode (AE) and a second electrode (CE). One end of the light-emitting diode (ED) may be connected to the first electrode (AE), and the other end of the light-emitting diode (ED) may be connected to the second electrode (CE). For example, the light-emitting diode (ED) may be connected to the first electrode (AE) through a first contact electrode (CTE1) and to the second electrode (CE) through a second contact electrode (CTE2).

[0117] Multiple light-emitting diodes (EDs) may be spaced apart from each other and may be aligned substantially parallel to each other. The spacing between the light-emitting diodes (EDs) is not particularly limited. Some of the light-emitting diodes (EDs) may be spaced adjacently, some of the light-emitting diodes (EDs) may be spaced apart at regular intervals, and some of the light-emitting diodes (EDs) may have non-uniform density and be aligned in a specific direction. For example, each of the multiple light-emitting diodes (EDs) may be positioned perpendicular to the direction in which the first electrode branch (AE2) or the second electrode branch (CE2) extends. As another example, each of the multiple light-emitting diodes (EDs) may be positioned obliquely to the direction in which the first electrode branch (AE2) or the second electrode branch (CE2) extends.

[0118] A plurality of light-emitting diodes (EDs) may include an active layer having the same material and emit light of the same wavelength or light of the same color. The first to third subpixels (SP1, SP2, SP3) may emit light of the same color. For example, the plurality of light-emitting diodes (EDs) may emit light of the third color or blue light having a peak wavelength in the range of 440 nm to 480 nm. Accordingly, the light-emitting element layer (EML) of the display device (10) may emit light of the third color or blue light. As another example, each of the first to third subpixels (SP1, SP2, SP3) may include a light-emitting diode (ED) having a different active layer and emit light of a different color.

[0119] The contact electrode (CTE) may include a first and second contact electrode (CTE1, CTE2). The first contact electrode (CTE1) may cover a first electrode branch (AE2) and a portion of the light-emitting diode (ED), and may electrically connect the first electrode branch (AE2) and the light-emitting diode (ED). The second contact electrode (CTE2) may cover a second electrode branch (CE2) and another portion of the light-emitting diode (ED), and may electrically connect the second electrode branch (CE2) and the light-emitting diode (ED).

[0120] The first contact electrode (CTE1) may be placed on the first electrode branch (AE2) and extended in the second direction (Y-axis direction). The first contact electrode (CTE1) may be in contact with one end of the light-emitting diode (ED). The light-emitting diode (ED) may be electrically connected to the first electrode (AE) through the first contact electrode (CTE1).

[0121] The second contact electrode (CTE2) may be disposed on the second electrode branch (CE2) and extend in a second direction (Y-axis direction). The second contact electrode (CTE2) may be spaced apart from the first contact electrode (CTE1) in a first direction (X-axis direction). The second contact electrode (CTE2) may be in contact with the other end of the light-emitting diode (ED). The light-emitting diode (ED) may be electrically connected to the second electrode (CE) through the second contact electrode (CTE2).

[0122] For example, the width of each of the first and second contact electrodes (CTE1, CTE2) may be greater than the width of each of the first and second electrode branches (AE2, CE2). As another example, each of the first and second contact electrodes (CTE1, CTE2) may cover one side of each of the first and second electrode branches (AE2, CE2).

[0123] Figure 5 is a cross-sectional view taken along the cutting line II-II' of Figure 4.

[0124] Referring to FIG. 5, the light-emitting element layer (EML) of the display device (10) may be disposed on a thin-film transistor layer (TFTL) and may include first to third insulating layers (IL1, IL2, IL3).

[0125] A plurality of first banks (BNK1) may be disposed in each of the first to third light-emitting regions (LA1, LA2, LA3). Each of the plurality of first banks (BNK1) may correspond to a first electrode (AE) or a second electrode (CE). Each of the first and second electrodes (AE, CE) may be disposed on the corresponding first bank (BNK1). For example, each of the first and second electrode branches (AE2, CE2) may be disposed on the corresponding first bank (BNK1). The first bank (BNK1) may include polyimide (PI), but is not limited thereto.

[0126] A plurality of first banks (BNK1) may be disposed on the first flattening layer (OC1), and the side of each of the plurality of first banks (BNK1) may be inclined away from the first flattening layer (OC1). For example, each of the first and second electrodes (AE, CE) may include a material with high reflectivity and may be disposed on the inclined surface of the first bank (BNK1) to reflect light emitted from the light-emitting diode (ED) toward the upper direction of the display device (10).

[0127] When combining FIG. 5 with FIG. 4, the first electrode stem portion (AE1) may include a first contact hole (CNT1) penetrating the first planarization layer (OC1). The first electrode stem portion (AE1) may be electrically connected to a thin-film transistor (TFT) through the first contact hole (CNT1). Thus, the first electrode (AE) can receive a predetermined electrical signal from the thin-film transistor (TFT).

[0128] The second electrode stem portion (CE1) may be extended in a first direction (X-axis direction) and may also be placed in a non-luminous region where a light-emitting diode (ED) is not placed. The second electrode stem portion (CE1) may include a second contact hole (CNT2) that penetrates the first planarization layer (OC1). The second electrode stem portion (CE1) may be electrically connected to a power electrode through the second contact hole (CNT2). The second electrode (CE) may receive a predetermined electrical signal from the power electrode.

[0129] The first and second electrodes (AE, CE) may include a transparent conductive material. For example, each of the first and second electrodes (AE, CE) may include at least one of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), and ITZO (Indium Tin-Zinc Oxide), but is not limited thereto.

[0130] The first and second electrodes (AE, CE) may include a highly reflective conductive material. For example, the first and second electrodes (AE, CE) may include a highly reflective metal such as silver (Ag), copper (Cu), aluminum (Al), etc. The first and second electrodes (AE, CE) may reflect light incident from the light-emitting diode (ED) to the top of the display device (10).

[0131] The first and second electrodes (AE, CE) may each have a structure in which a transparent conductive material and a metal with high reflectivity are stacked one or more times, or may be formed as a single layer including these. For example, the first and second electrodes (AE, CE) may have a stacked structure of ITO / silver (Ag) / ITO / IZO or may be an alloy including aluminum (Al), nickel (Ni), lanthanum (La), etc., but are not limited thereto.

[0132] The first insulating layer (IL1) may be disposed on the first planarization layer (OC1), the first electrode (AE), and the second electrode (CE). The first insulating layer (IL1) may cover a portion of each of the first and second electrodes (AE, CE). For example, the first insulating layer (IL1) may expose a portion of the first and second electrodes (AE, CE) corresponding to the upper surface of the first bank (BNK1) and may cover a portion of the first and second electrodes (AE, CE) that does not correspond to the upper surface. Accordingly, the first insulating layer (IL1) may include an opening that exposes a portion of the first and second electrodes (AE, CE) corresponding to the upper surface of the first bank (BNK1).

[0133] For example, the first insulating layer (IL1) may include an inorganic insulating material and may include a recessed step between the first and second electrodes (AE, CE). The second insulating layer (IL2) may fill the recessed step of the first insulating layer (IL1). Thus, the second insulating layer (IL2) may flatten the upper surface of the first insulating layer (IL1), and a light-emitting diode (ED) may be placed on the first and second insulating layers (IL1, IL2).

[0134] The first insulating layer (IL1) can protect the first and second electrodes (AE, CE) and can insulate the first and second electrodes (AE, CE) from each other. The first insulating layer (IL1) can prevent the light-emitting diode (ED) from being damaged by direct contact with other components.

[0135] A light-emitting diode (ED) may be disposed between a first electrode (AE) and a second electrode (CE) on the first and second insulating layers (IL1, IL2). One end of the light-emitting diode (ED) may be connected to the first electrode (AE), and the other end of the light-emitting diode (ED) may be connected to the second electrode (CE). For example, the light-emitting diode (ED) may be connected to the first electrode (AE) through a first contact electrode (CTE1) and to the second electrode (CE) through a second contact electrode (CTE2).

[0136] The third insulating layer (IL3) may be partially disposed on the light-emitting diode (ED) positioned between the first and second electrodes (AE, CE). The third insulating layer (IL3) may partially cover the outer surface of the light-emitting diode (ED). The third insulating layer (IL3) may protect the light-emitting diode (ED).

[0137] The contact electrode (CTE) may include a first and second contact electrode (CTE1, CTE2). The first contact electrode (CTE1) may cover a first electrode branch (AE2) and a portion of the light-emitting diode (ED), and may electrically connect the first electrode branch (AE2) and the light-emitting diode (ED). The second contact electrode (CTE2) may cover a second electrode branch (CE2) and another portion of the light-emitting diode (ED), and may electrically connect the second electrode branch (CE2) and the light-emitting diode (ED).

[0138] The contact electrode (CTE) may include a conductive material. For example, the contact electrode (CTE) may include ITO, IZO, ITZO, aluminum (Al), etc., but is not limited thereto.

[0139] FIG. 6 is a drawing showing a light-emitting diode according to one embodiment.

[0140] Referring to FIG. 6, the light-emitting diode (ED) may be a light-emitting diode, specifically, the light-emitting diode (ED) may be an inorganic light-emitting diode made of inorganic material having a size in the micrometer or nanometer range. The inorganic light-emitting diode may be aligned between two electrodes in which polarity is formed when an electric field is formed in a specific direction between two electrodes facing each other. The light-emitting diode (ED) may be aligned between the electrodes by the electric field formed on the two electrodes.

[0141] A light-emitting diode (ED) according to one embodiment may have a shape that extends in one direction. The light-emitting diode (ED) may have a shape such as a cylinder, a rod, a wire, or a tube. However, the shape of the light-emitting element (30) is not limited thereto, and the light-emitting diode (ED) may have various shapes, such as a polygonal prism shape like a cube, a rectangular prism, or a hexagonal prism, or a shape that extends in one direction but has a partially inclined outer surface. A plurality of semiconductors included in the light-emitting diode (ED) may have a structure in which they are sequentially arranged or stacked along the one direction.

[0142] A light-emitting diode (ED) may include a semiconductor layer doped with any type of conductivity impurity (e.g., p-type or n-type). The semiconductor layer can emit light of a specific wavelength range when an electrical signal applied from an external power source is transmitted.

[0143] The light-emitting diode (ED) may include a first semiconductor layer (111), a second semiconductor layer (113), an active layer (115), an electrode layer (117), and an insulating film (118).

[0144] The first semiconductor layer (111) may be an n-type semiconductor. For example, when a light-emitting diode (ED) emits blue light, the first semiconductor layer (111) may include a semiconductor material having the chemical formula AlxGayIn1-x-yN (0≤x≤1, 0≤y≤1, 0≤x+y≤1). The first semiconductor layer (111) may include at least one semiconductor material among n-type doped AlGaInN, GaN, AlGaN, InGaN, AlN, and InN. The first semiconductor layer (111) may be doped with an n-type dopant such as Si, Ge, or Sn. The first semiconductor layer (111) may be n-GaN doped with n-type Si. The length of the first semiconductor layer (111) may be in the range of 1.5 μm to 5 μm, but is not limited thereto.

[0145] The second semiconductor layer (113) may be disposed on the active layer (115). For example, when the light-emitting diode (ED) emits blue or green light, the second semiconductor layer (113) may include a semiconductor material having the chemical formula AlxGayIn1-x-yN (0≤x≤1, 0≤y≤1, 0≤x+y≤1). For example, the second semiconductor layer (113) may include at least one semiconductor material among p-type doped AlGaInN, GaN, AlGaN, InGaN, AlN, and InN. The second semiconductor layer (113) may be doped with a p-type dopant such as Mg, Zn, Ca, Se, or Ba. The second semiconductor layer (113) may be p-GaN doped with p-type Mg. The length of the second semiconductor layer (113) may be in the range of 0.05 μm to 0.10 μm, but is not limited thereto.

[0146] Each of the first and second semiconductor layers (111, 113) may be composed of a single layer, but is not limited thereto. For example, each of the first and second semiconductor layers (111, 113) may have multiple layers including a clad layer or a TSBR (Tensile Strain Barrier Reducing) layer.

[0147] The active layer (115) may be disposed between the first and second semiconductor layers (111, 113). The active layer (115) may include a material having a single or multiple quantum well structure. If the active layer (115) includes a material having a multiple quantum well structure, a plurality of quantum layers and well layers may be stacked alternately. The active layer (115) may emit light through the coupling of electron-hole pairs according to an electrical signal applied through the first and second semiconductor layers (111, 113). For example, if the active layer (115) emits blue light, it may include a material such as AlGaN or AlGaInN. If the active layer (115) has a structure in which quantum layers and well layers are stacked alternately in a multiple quantum well structure, the quantum layers may include a material such as AlGaN or AlGaInN, and the well layers may include a material such as GaN or AlInN. The active layer (115) can emit blue light by including AlGaInN as the quantum layer and AlInN as the well layer.

[0148] As another example, the active layer (115) may have a structure in which semiconductor materials with a large band gap energy and semiconductor materials with a small band gap energy are alternately stacked, and may include semiconductor materials of group 3 to group 5 depending on the wavelength range of the emitted light. The light emitted by the active layer (115) is not limited to blue light and may emit red or green light depending on the case. The length of the active layer (115) may have a range of 0.05 μm to 0.10 μm, but is not limited thereto.

[0149] The light emitted from the active layer (115) can be emitted along the length of the light-emitting diode (ED) and can also be emitted to both sides. The directionality of the light emitted from the active layer (115) may not be limited.

[0150] The electrode layer (117) may be an ohmic contact electrode. As another example, the electrode layer (117) may be a Schottky contact electrode. The light-emitting diode (ED) may include at least one electrode layer (117). The electrode layer (117) may reduce the resistance between the light-emitting diode (ED) and the electrode or contact electrode (CTE) when the light-emitting diode (ED) is electrically connected to the electrode or contact electrode (CTE). The electrode layer (117) may include a conductive metal. For example, the electrode layer (117) may include at least one of aluminum (Al), titanium (Ti), indium (In), gold (Au), silver (Ag), indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin-zinc oxide (ITZO). The electrode layer (117) may include an n-type or p-type doped semiconductor material.

[0151] The insulating film (118) can surround the outer surface of a plurality of semiconductor layers and electrode layers. The insulating film (118) can surround the outer surface of the active layer (115) and can extend in the direction in which the light-emitting diode (ED) extends. The insulating film (118) can protect the light-emitting diode (ED). For example, the insulating film (118) can surround the side of the light-emitting diode (ED) and expose both ends in the longitudinal direction of the light-emitting diode (ED).

[0152] The insulating film (118) may include materials having insulating properties, such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), aluminum nitride (AlN), aluminum oxide (Al2O3), etc. Accordingly, the insulating film (118) can prevent an electrical short circuit that may occur when the active layer (115) comes into direct contact with the electrode through which an electrical signal is transmitted to the light-emitting diode (ED). In addition, the insulating film (118) can prevent a decrease in light-emitting efficiency by protecting the outer surface of the light-emitting diode (ED), including the active layer (115).

[0153] FIG. 7 is a plan view showing the combined structure of a tile-type display device according to one embodiment. FIG. 8 is a plan view showing a first pixel of a tile-type display device according to one embodiment. FIG. 9 is a plan view showing a second pixel of a tile-type display device according to one embodiment.

[0154] Referring to FIG. 7, a tile-type display device (TD) according to one embodiment may include a plurality of display devices (PA1 to PA4). For example, the tile-type display device (TD) may include a first display device (PA1), a second display device (PA2), a third display device (PA3), and a fourth display device (PA4), but the number of display devices is not limited to the embodiment of FIG. 7. The number of display devices can be varied depending on the size of the tile-type display device (TD). For example, two or more display devices may be arranged adjacent to each other in one direction.

[0155] The display devices (PA1~PA4) may have a rectangular shape including a long side and a short side. Each long side of the display devices (PA1~PA4) may extend in a first direction (X-axis direction), and each short side of the display devices (PA1~PA4) may extend in a second direction (Y-axis direction). Multiple display devices (PA1~PA4) may be arranged such that their long sides and short sides are adjacent to or in contact with each other. For example, a first display device (PA1) may be arranged such that one side of its first short side (SS1) is in contact with one side of its second short side (SS2) of an adjacent second display device (PA2), and one side of its first long side (LS1) may be arranged such that one side of its third long side (LS3) of an adjacent third display device (PA3). The second display device (PA2) may be positioned such that one side of the second long side (LS2) is in contact with one side of the fourth long side (LS4) of the adjacent fourth display device (PA4), and the third display device (PA3) may be positioned such that one side of the third short side (SS3) is in contact with one side of the fourth short side (SS4) of the adjacent fourth display device (PA4).

[0156] In one embodiment, the tile-type display device (TD) may include a boundary region (BA) in which at least one side of the display devices (PA1 to PA4) is adjacent to each other, and a main region (MA) which is the remaining area other than the boundary region (BA).

[0157] The boundary area (BA) may be an area where the long sides of the display devices (PA1~PA4) are adjacent to each other and an area where the short sides of the display devices (PA1~PA4) are adjacent to each other. For example, the boundary area (BA) may include an area where the first long side (LS1) of the first display device (PA1) and the third long side (LS3) of the third display device (PA3) are adjacent, an area where the second long side (LS2) of the second display device (PA2) and the fourth long side (LS4) of the fourth display device (PA4) are adjacent, an area where the first short side (SS1) of the first display device (PA1) and the second short side (SS2) of the second display device (PA2) are adjacent, and an area where the third short side (SS3) of the third display device (PA3) and the fourth short side (SS4) of the fourth display device (PA4) are adjacent.

[0158] A boundary area (BA) may be arranged to extend in a first direction (X-axis direction) between the first display device (PA1) and the third display device (PA3), and between the second display device (PA2) and the fourth display device (PA4). Additionally, a boundary area (BA) may be arranged to extend in a second direction (Y-axis direction) between the first display device (PA1) and the second display device (PA2), and between the third display device (PA3) and the fourth display device (PA4).

[0159] The main area (MA) may be the remaining area of ​​the display devices (PA1~PA4) excluding the boundary area (BA). The main area (MA) is the area where most of the pixels (PX) are arranged in the display devices (PA1~PA4) and may occupy most of the area of ​​the tile-type display device (TD). The main area (MA) may include a plurality of main areas, and may include a first main area (MA1) arranged in the first display device (PA1), a second main area (MA2) arranged in the second display device (PA2), a third main area (MA3) arranged in the third display device (PA3), and a fourth main area (MA4) arranged in the fourth display device (PA4). The main areas (MA) may be arranged spaced apart from each other with the boundary area (BA) in between. For example, the first main area (MA1) of the first display device (PA1) may be spaced apart from the second main area (MA2) of the second display device (PA2) in the first direction (X-axis direction) with a boundary area (BA) in between. The first main area (MA1) of the first display device (PA1) may be spaced apart from the third main area (MA3) of the third display device (PA3) in the second direction (Y-axis direction) with a boundary area (BA) in between. The third main area (MA3) of the third display device (PA3) may be spaced apart from the fourth main area (MA4) of the fourth display device (PA4) in the second direction (Y-axis direction) with a boundary area (BA) in between.

[0160] Each display device (PA1~PA4) can display an image by including a plurality of pixels (PX), each containing a plurality of subpixels (SP). In order to display a unified image, each display device (PA1~PA4) needs to have the plurality of pixels (PX) aligned in a first direction (X-axis direction) and a second direction (Y-axis direction). If the alignment of each display device (PA1~PA4) is misaligned in the first direction (X-axis direction) or the second direction (Y-axis direction), the arrangement of the plurality of pixels (PX) in the boundary area (BA) is distorted, and the boundary may be visible.

[0161] In one embodiment, the configuration of the subpixels of the main area (MA) and the boundary area (BA) is formed differently, thereby improving the visibility of the boundary of the tile-type display device (TD).

[0162] Referring to FIG. 8 in conjunction with FIG. 7, the main area (MA) may include a plurality of first pixels (PX1). The plurality of first pixels (PX1) may be arranged in a matrix shape consisting of a plurality of rows and a plurality of columns. The plurality of first pixels (PX1) may include a plurality of subpixels (SP) that emit different colors and are arranged adjacent to each other, and the plurality of subpixels (SP) may include a first subpixel (SP1), a second subpixel (SP2), and a third subpixel (SP3). The plurality of subpixels (SP) may be of the same size, but are not limited thereto and may be of different sizes.

[0163] Referring to FIG. 9 in conjunction with FIG. 7, the boundary region (BA) may include a plurality of second pixels (PX2). The plurality of second pixels (PX2) may be arranged in two rows or two columns. In the region where the long sides of the display devices (PA1 to PA4) are adjacent, the plurality of second pixels (PX2) may be arranged in two rows, and in the region where the short sides of the display devices (PA1 to PA4) are adjacent, the plurality of second pixels (PX2) may be arranged in two columns. For example, the row formed by the plurality of second pixels (PX2) of the first display device (PA1) and the row formed by the plurality of second pixels (PX2) of the third display device (PA3) may be added to form a total of two rows. Additionally, the row formed by the plurality of second pixels (PX2) of the second display device (PA2) and the row formed by the plurality of second pixels (PX2) of the fourth display device (PA4) may be added to form a total of two rows. However, this is not limited to this, and the rows formed by multiple second pixels (PX) may be arranged in three or more rows.

[0164] Additionally, the plurality of second pixels (PX2) of the first display device (PA1) and the plurality of second pixels (PX2) of the second display device (PA2) can be added to form a total of two rows. The plurality of second pixels (PX2) of the third display device (PA3) and the plurality of second pixels (PX2) of the fourth display device (PA4) can be added to form a total of two rows. However, this is not limited thereto, and the rows formed by the plurality of second pixels (PX2) may be arranged in three or more rows.

[0165] A plurality of second pixels (PX2) may include a plurality of subpixels (SP) that emit different colors and are arranged adjacent to each other, similar to the first pixel (PX1) described above, and the plurality of subpixels (SP) may include a first subpixel (SP1), a second subpixel (SP2), and a third subpixel (SP3). The plurality of subpixels (SP) may be formed with the same size and / or the same shape, but are not limited thereto, and may be formed with different sizes and / or the same shape.

[0166] Unlike the first pixel (PX1), the plurality of subpixels (SP) included in the second pixel (PX2) may each include a plurality of divided pixels (PSP). The divided pixels (PSP) may emit the same color. For example, the divided pixels (PSP) of the first subpixel (SP1) may emit the same first color, the divided pixels (PSP) of the second subpixel (SP2) may emit the same second color, and the divided pixels (PSP) of the third subpixel (SP3) may emit the same third color.

[0167] The first subpixel (SP1), the second subpixel (SP2), and the third subpixel (SP3) can each be formed with the same shape as each other. The first subpixel (SP1) will be explained in detail as an example.

[0168] The first subpixel (SP1) may include a first divided pixel (PSP1), a second divided pixel (PSP2), a third divided pixel (PSP3), and a fourth divided pixel (PSP4) arranged adjacent to each other. The first divided pixel (PSP1) and the second divided pixel (PSP2) may be arranged adjacent to each other in the short axis direction of the first subpixel (SP1), that is, in the first direction (X-axis direction), but spaced apart from each other. The first divided pixel (PSP1) and the second divided pixel (PSP2) may be formed with the same size and shape. The length of the long side (L1) of each of the first divided pixel (PSP1) and the second divided pixel (PSP2) may be the same as the length of the long side ('L2' in FIG. 8) of the first subpixel (SP1) of the aforementioned first pixel (PX1). The distance (L3) from one side of the first divided pixel (PSP1) to the other side of the second divided pixel (PSP2) may be the same as the length of the short side of the first sub-pixel (SP1) of the first pixel (PX1) described above ('L4' in FIG. 8). That is, the first divided pixel (PSP1) and the second divided pixel (PSP2) of the first sub-pixel (SP1) of the second pixel (PX2) may be formed with a size in which the first sub-pixel (SP1) of the first pixel (PX1) is divided.

[0169] The third divided pixel (PSP3) may be positioned on one side of the first divided pixel (PSP1) or the second divided pixel (PSP2) in the direction of the long axis of the first sub-pixel (SP1), that is, the second direction (Y-axis direction). The fourth divided pixel (PSP4) may be positioned on the other side of the first divided pixel (PSP1) or the second divided pixel (PSP2) in the direction opposite to the direction of the long axis of the first sub-pixel (SP1), that is, the second direction (Y-axis direction). That is, the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may be positioned spaced apart from each other with the first divided pixel (PSP1) and the second divided pixel (PSP2) in between. The direction in which the long side of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4) is extended may be parallel to the direction in which the short side of the first divided pixel (PSP1) or the second divided pixel (PSP2) is extended. That is, the direction in which the long side of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4) is extended may be the first direction (X-axis direction).

[0170] The third divided pixel (PSP3) and the fourth divided pixel (PSP4) may be formed with the same size and shape. The length of the long side (L5) of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may be the same as the length of the short side ('L4' in FIG. 8) of the first sub-pixel (SP1) of the first pixel (PX1) described above. The length of the long side (L5) of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may be the same as the distance (L3) from one side of the first divided pixel (PSP1) to the other side of the second divided pixel (PSP2). The length of the short side (L6) of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may be smaller than the length of the long side (L1) of the first divided pixel (PSP1). The length (L6) of the short side of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may be related to the alignment tolerance of each display device (PA1~PA4) and the distance at which misalignment is visible to the user. For example, the length (L6) of the short side of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may be the value obtained by subtracting the distance at which misalignment is visible to the user from the alignment tolerance distance of each display device (PA1~PA4).

[0171] According to the subpixels (SP) described above, the size of each subpixel (SP) of the second pixel (PX2) can be larger than the size of each subpixel (SP) of the second pixel (PX1). Also, the size of each of the first divided pixel (PSP1) and the second divided pixel (PSP2) can be larger than the size of each of the third divided pixel (PSP3) and the fourth divided pixel (PSP4).

[0172] The subpixels (SP) of the second pixel (PX2) can be divided into smaller subpixels (SP) to emit light individually. The subpixels (SP) of the first pixel (PX1) are larger in size than the subpixels (SP) of the second subpixel (PX2), so the driving circuit for driving each subpixel (SP) can be relatively complex. The divided pixels (PSP) included in each of the subpixels (SP) of the second subpixel (PX2) can be driven individually by having a simple driving circuit. For example, each divided pixel (PSP) can be driven by only a driving transistor, with the switching transistor and / or sensing transistor omitted. The driving transistor can emit light when a turn-on / turn-off signal is applied to the gate electrode of the driving transistor through a scan line and a driving current for the light-emitting diode is supplied through a power line.

[0173] Hereinafter, the operation of a tile-type display device according to one embodiment when the display devices are aligned normally, and the operation to compensate for misalignment will be described.

[0174] FIG. 10 is an enlarged view schematically showing area A of FIG. 7. FIG. 10 shows the case where the first display device (PA1) and the third display device (PA3) are aligned normally in the first direction (X-axis direction). In addition, the following embodiments describe the case where pixels (PX) emit white light.

[0175] Referring to FIG. 10, the first display device (PA1) and the third display device (PA3) can be aligned and arranged in a first direction (X-axis direction). The first display device (PA1) and the third display device (PA3) can be aligned normally. Here, normal alignment means that the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the third display device (PA3) are not misaligned in the first direction (X-axis direction) at the boundary area (BA). For example, one side of the second pixel (PX2) of the first display device (PA1) and one side of the second pixel (PX2) of the third display device (PA3) can coincide with any line (PL) in the second direction (Y-axis direction).

[0176] When the first display device (PA1) and the third display device (PA3) are aligned in the first direction (X-axis direction), the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the third display device (PA3) can emit light in at least a portion.

[0177] Specifically, the second pixels (PX2) of the first and third display devices (PA1, PA3) may have a larger area than the first pixels (PX1) as described above. When both the first pixels (PX1) and the second pixels (PX2) of the first and third display devices (PA1, PA3) emit light, a difference in brightness may appear because the light-emitting area of ​​the second pixel (PX2) is larger.

[0178] In one embodiment, in each sub-pixel (SP) of the second pixels (PX2) of the first and third display devices (PA1, PA3), the first divided pixel (PSP1) and the second divided pixel (PSP2) emit light, while the third divided pixel (PSP3) and the fourth divided pixel (PSP4) do not emit light. In the drawings, the divided pixels that do not emit light are indicated as 'OFF'.

[0179] The respective areas of the first sub-pixel (PSP1) and the second sub-pixel (PSP2) of the first sub-pixel (SP1) of the second pixel (PX2) may be smaller than the area of ​​the first sub-pixel (SP1) of the first pixel (PX1). The sum of the areas of the first sub-pixel (PSP1) and the second sub-pixel (PSP2) may be smaller than the area of ​​the first sub-pixel (SP1) of the first pixel (PX1) because there is a gap between them. However, the sum of the areas of the first sub-pixel (PSP1) and the second sub-pixel (PSP2) may be similar to the area of ​​the first sub-pixel (SP1) of the first pixel (PX1). Thus, the light-emitting area of ​​the first sub-pixel (SP1) of the first pixel (PX1) may appear similar to the light-emitting area of ​​the first sub-pixel (PSP1) and the second sub-pixel (PSP2) of the first sub-pixel (SP1) of the second pixel (PX2). Accordingly, the difference in brightness between the first pixels (PX1) and the second pixels (PX2) in the boundary area (BA) between the first display device (PA1) and the third display device (PA3) is reduced, so that it can be seen by the user as a single integrated tile-type display device (TD).

[0180] FIG. 11 is an enlarged view schematically showing one example of area A of FIG. 7. FIG. 12 is an enlarged view schematically showing another example of area A of FIG. 7. FIG. 11 illustrates a case where the first display device (PA1) and the third display device (PA3) are misaligned in the first direction (X-axis direction), and FIG. 12 illustrates a case where the first display device (PA1) and the third display device (PA3) are misaligned in the opposite direction of the first direction (X-axis direction).

[0181] Referring to FIG. 11, the first display device (PA1) and the third display device (PA3) may be misaligned in a first direction (X-axis direction). Here, misalignment means that the second pixel (PX2) of the third display device (PA3) is moved in the first direction (X-axis direction) or in the opposite direction of the first direction relative to the second pixel (PX2) of the first display device (PA1) in the boundary area (BA). For example, one side of the second pixel (PX2) of the first display device (PA1) and one side of the second pixel (PX2) of the third display device (PA3) may be misaligned or inconsistent with any line (PL) in the second direction (Y-axis direction).

[0182] When the first display device (PA1) and the third display device (PA3) are misaligned in the first direction (X-axis direction), the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the third display device (PA3) may emit light in only a portion.

[0183] In one embodiment, the second divided pixel (PSP2) of the first subpixel (SP1) of the second pixels (PX2) of the first display device (PA1) may emit light, while the first divided pixel (PSP1), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) may not emit light. Additionally, in each of the second subpixel (SP2) and the third subpixel (SP3), the first divided pixel (PSP1) and the second divided pixel (PSP2) may emit light, while the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may not emit light.

[0184] As the third display device (PA3) is misaligned in the first direction (X-axis direction) relative to the first display device (PA1), the first pixel (PX1) and the second pixel (PX2) of the third display device (PA3) may also be misaligned in the first direction (X-axis direction) relative to the first pixel (PX1) and the second pixel (PX2) of the first display device (PA1). In this case, the user may perceive the boundary area (BA) between the first display device (PA1) and the third display device (PA3) as being bent.

[0185] In one embodiment, a second divided pixel (PSP2) can be made to emit light from a first sub-pixel (SP1) of a second pixel (PX2) of a first display device (PA1), while the first divided pixel (PSP1), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) can be made not to emit light. In this case, the light-emitting area of ​​the second pixel (PX2) can be made smaller than that of the first pixel (PX1) by the amount of the first divided pixel (PSP1) and shifted in the first direction (X-axis direction) by the amount of the first divided pixel (PSP1). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the first display device (PA1), there is an effect in that the arrangement of the light-emitting areas shifts slightly in the first direction (X-axis direction).

[0186] In addition, in each of the first subpixel (SP1) and the second subpixel (SP2) of the second pixels (PX2) of the third display device (PA3), the first divided pixel (PSP1) and the second divided pixel (PSP2) may emit light, and the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may not emit light. In the third subpixel (SP3), the first divided pixel (PSP1) may emit light, and the second divided pixel (PSP2), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) may not emit light.

[0187] In one embodiment, the first divided pixel (PSP1) can be made to emit light at the third sub-pixel (SP3) of the second pixel (PX2) of the third display device (PA3), while the second divided pixel (PSP2), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) can be made not to emit light. In this case, the light-emitting area of ​​the second pixel (PX2) can be reduced by the second divided pixel (PSP2) compared to the first pixel (PX1), and can be moved by the second divided pixel (PSP2) in the opposite direction of the first direction (X-axis direction). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the third display device (PA3), there is an effect in that the arrangement of the light-emitting areas is slightly moved in the opposite direction of the first direction (X-axis direction).

[0188] Consequently, the light-emitting area of ​​the second pixel (PX2) of the first display device (PA1) in the boundary area (BA) may be slightly moved in the first direction (X-axis direction), and the light-emitting area of ​​the second pixel (PX2) of the third display device (PA3) may be slightly moved in the opposite direction of the first direction (X-axis direction). This improves the visibility to the user of misalignment in the boundary area (BA) when the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the third display device (PA3) emit white light.

[0189] Referring to FIG. 12, as another example, the first display device (PA1) and the third display device (PA3) may be misaligned in opposite directions of the first direction (X-axis direction). When the first display device (PA1) and the third display device (PA3) are misaligned in opposite directions of the first direction (X-axis direction), the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the third display device (PA3) may emit light only partially.

[0190] In one embodiment, the first divided pixel (PSP1) of the third sub-pixel (SP3) of the second pixels (PX2) of the first display device (PA1) may emit light, while the second divided pixel (PSP2), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) may not emit light. Additionally, in each of the first sub-pixel (SP1) and the second sub-pixel (SP2), the first divided pixel (PSP1) and the second divided pixel (PSP2) may emit light, while the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may not emit light.

[0191] As the third display device (PA3) is misaligned in the opposite direction of the first direction (X-axis direction) relative to the first display device (PA1), the first pixel (PX1) and the second pixel (PX2) of the third display device (PA3) may also be misaligned in the opposite direction of the first direction (X-axis direction) relative to the first pixel (PX1) and the second pixel (PX2) of the first display device (PA1). In this case, the user may perceive the boundary area (BA) between the first display device (PA1) and the third display device (PA3) as being bent.

[0192] In one embodiment, the first divided pixel (PSP1) can be made to emit light at the third sub-pixel (SP3) of the second pixel (PX2) of the first display device (PA1), while the second divided pixel (PSP2), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) can be made not to emit light. In this case, the light-emitting area of ​​the second pixel (PX2) can be reduced by the second divided pixel (PSP2) compared to the first pixel (PX1), and can be moved by the second divided pixel (PSP2) in the opposite direction of the first direction (X-axis direction). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the first display device (PA1), there is an effect in that the arrangement of the light-emitting areas is slightly moved in the opposite direction of the first direction (X-axis direction).

[0193] In addition, in the first subpixel (SP1) of the second pixels (PX2) of the third display device (PA3), the second divided pixel (PSP2) may emit light, and the first divided pixel (PSP1), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) may not emit light. In each of the second subpixel (SP2) and the third subpixel (SP3), the first divided pixel (PSP1) and the second divided pixel (PSP2) may emit light, and the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may not emit light.

[0194] In one embodiment, the second divided pixel (PSP2) can be made to emit light from the first sub-pixel (SP1) of the second pixel (PX2) of the third display device (PA3), while the first divided pixel (PSP1), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) can be made not to emit light. In this case, the light-emitting area of ​​the second pixel (PX2) can be made smaller than that of the first pixel (PX1) by the amount of the first divided pixel (PSP1) and shifted by the amount of the first divided pixel (PSP1) in the first direction (X-axis direction). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the third display device (PA3), there is an effect in that the arrangement of the light-emitting areas shifts slightly in the first direction (X-axis direction).

[0195] Consequently, the light-emitting area of ​​the second pixel (PX2) of the first display device (PA1) in the boundary area (BA) may be slightly moved in the opposite direction of the first direction (X-axis direction), and the light-emitting area of ​​the second pixel (PX2) of the third display device (PA3) may be slightly moved in the first direction (X-axis direction). This improves the visibility to the user of misalignment in the boundary area (BA) when the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the third display device (PA3) emit white light.

[0196] FIG. 13 is an enlarged view schematically showing area B of FIG. 7. FIG. 13 shows the case where the first display device (PA1) and the second display device (PA2) are aligned normally in the second direction (Y-axis direction).

[0197] Referring to FIG. 13, the first display device (PA1) and the second display device (PA2) can be arranged in alignment in the second direction (Y-axis direction). The first display device (PA1) and the second display device (PA2) can be aligned in the boundary area (BA) without the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the second display device (PA2) being misaligned in the second direction (Y-axis direction). For example, one side of the second pixel (PX2) of the first display device (PA1) and one side of the second pixel (PX2) of the second display device (PA2) can coincide with any line (PL) in the first direction (X-axis direction).

[0198] When the first display device (PA1) and the second display device (PA2) are aligned in the second direction (Y-axis direction), the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the second display device (PA2) can emit light in at least a portion.

[0199] Specifically, the second pixels (PX2) of the first and second display devices (PA1, PA2) may have a larger area than the first pixels (PX1) as described above. When both the first pixels (PX1) and the second pixels (PX2) of the first and second display devices (PA1, PA2) emit light, a difference in brightness may appear because the light-emitting area of ​​the second pixel (PX2) is larger.

[0200] In one embodiment, in each sub-pixel (SP) of the second pixels (PX2) of the first and second display devices (PA1, PA2), the first divided pixel (PSP1) and the second divided pixel (PSP2) emit light, and the third divided pixel (PSP3) and the fourth divided pixel (PSP4) may not emit light.

[0201] The respective areas of the first sub-pixel (PSP1) and the second sub-pixel (PSP2) of the first sub-pixel (SP1) of the second pixel (PX2) may be smaller than the area of ​​the first sub-pixel (SP1) of the first pixel (PX1). The sum of the areas of the first sub-pixel (PSP1) and the second sub-pixel (PSP2) may be smaller than the area of ​​the first sub-pixel (SP1) of the first pixel (PX1) because there is a gap between them. However, the sum of the areas of the first sub-pixel (PSP1) and the second sub-pixel (PSP2) may be similar to the area of ​​the first sub-pixel (SP1) of the first pixel (PX1). Thus, the light-emitting area of ​​the first sub-pixel (SP1) of the first pixel (PX1) may appear similar to the light-emitting area of ​​the first sub-pixel (PSP1) and the second sub-pixel (PSP2) of the first sub-pixel (SP1) of the second pixel (PX2). Accordingly, the difference in brightness between the first pixels (PX1) and the second pixels (PX2) in the boundary area (BA) between the first display device (PA1) and the second display device (PA2) is reduced, so that it can be seen by the user as a single integrated tile-type display device (TD).

[0202] FIG. 14 is an enlarged view schematically showing one example of region B of FIG. 7. FIG. 15 is an enlarged view schematically showing another example of region B of FIG. 7. FIG. 14 illustrates a case where the second display device (PA2) is misaligned in the opposite direction of the second direction (Y-axis direction) relative to the first display device (PA1), and FIG. 15 illustrates a case where the second display device (PA2) is misaligned in the second direction (Y-axis direction) relative to the first display device (PA1).

[0203] Referring to FIG. 14, the second display device (PA2) may be misaligned in the opposite direction of the second direction (Y-axis direction) relative to the first display device (PA1). Here, misalignment means that the second pixel (PX2) of the second display device (PA2) is moved in the second direction (Y-axis direction) or the opposite direction of the second direction relative to the second pixel (PX2) of the first display device (PA1) in the boundary area (BA). For example, one side of the second pixel (PX2) of the first display device (PA1) and one side of the second pixel (PX2) of the second display device (PA2) may be misaligned with any line (PL) in the first direction (X-axis direction).

[0204] When the second display device (PA2) is misaligned in the opposite direction of the second direction (Y-axis direction) compared to the first display device (PA1), the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the second display device (PA2) may emit light only partially.

[0205] In one embodiment, the first divided pixel (PSP1), the second divided pixel (PSP2), and the fourth divided pixel (PSP4) of the first to third subpixels (SP1~SP3) of the second pixel (PX2) of the first display device (PA1) may emit light, and the third divided pixel (PSP3) may not emit light.

[0206] As the second display device (PA2) is misaligned in the opposite direction of the second direction (Y-axis direction) relative to the first display device (PA1), the first pixel (PX1) and the second pixel (PX2) of the second display device (PA2) may also be misaligned in the opposite direction of the second direction (Y-axis direction) relative to the first pixel (PX1) and the second pixel (PX2) of the first display device (PA1). In this case, the user may perceive the boundary area (BA) between the first display device (PA1) and the second display device (PA2) as being bent.

[0207] In one embodiment, the first divided pixel (PSP1), the second divided pixel (PSP2), and the fourth divided pixel (PSP4) can be made to emit light and the third divided pixel (PSP3) can be made not to emit light in the first to third sub-pixels (SP1~SP3) of the second pixel (PX2) of the first display device (PA1). In this case, the light-emitting area of ​​the second pixel (PX2) can be increased by the fourth divided pixel (PSP4) compared to the first pixel (PX1), and can be moved by the fourth divided pixel (PSP4) in the opposite direction of the second direction (Y-axis direction). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the first display device (PA1), there is an effect in that the arrangement of the light-emitting area is slightly moved in the opposite direction of the second direction (Y-axis direction).

[0208] In addition, in each of the first to third subpixels (SP1~SP3) of the second pixels (PX2) of the second display device (PA2), the first divided pixel (PSP1), the second divided pixel (PSP2), and the third divided pixel (PSP3) may emit light, and the fourth divided pixel (PSP4) may not emit light.

[0209] In one embodiment, the first divided pixel (PSP1), the second divided pixel (PSP2), and the third divided pixel (PSP3) can be illuminated and the fourth divided pixel (PSP4) can be de-illuminated at each of the first to third sub-pixels (SP1 to SP3) of the second pixel (PX2) of the second display device (PA2). In this case, the light-emitting area of ​​the second pixel (PX2) can be increased by the amount of the third divided pixel (PSP3) compared to the first pixel (PX1), and can be shifted in the second direction (Y-axis direction) by the amount of the third divided pixel (PSP3). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the second display device (PA2), there is an effect of the arrangement of the light-emitting area shifting slightly in the second direction (Y-axis direction).

[0210] Consequently, the light-emitting area of ​​the second pixel (PX2) of the first display device (PA1) in the boundary area (BA) may be slightly moved in the opposite direction of the second direction (Y-axis direction), and the light-emitting area of ​​the second pixel (PX2) of the second display device (PA2) may be slightly moved in the second direction (Y-axis direction). This improves the visibility of misalignment to the user in the boundary area (BA) when the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the second display device (PA2) emit white light.

[0211] Referring to FIG. 15, as another example, the second display device (PA2) may be misaligned in the second direction (Y-axis direction) relative to the first display device (PA1). When the second display device (PA2) is misaligned in the second direction (Y-axis direction) relative to the first display device (PA1), the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the second display device (PA2) may emit light only partially.

[0212] In one embodiment, the first divided pixel (PSP1), the second divided pixel (PSP2), and the third divided pixel (PSP3) of each of the first to third subpixels (SP1~SP3) of the second pixel (PX2) of the first display device (PA1) may emit light, and the fourth divided pixel (PSP4) may not emit light.

[0213] As the second display device (PA2) is misaligned in the second direction (Y-axis direction) relative to the first display device (PA1), the first pixel (PX1) and the second pixel (PX2) of the second display device (PA2) may also be misaligned in the second direction (Y-axis direction) relative to the first pixel (PX1) and the second pixel (PX2) of the first display device (PA1). In this case, the user may perceive the boundary area (BA) between the first display device (PA1) and the second display device (PA2) as being bent.

[0214] In one embodiment, the first divided pixel (PSP1), the second divided pixel (PSP2), and the third divided pixel (PSP3) can be illuminated and the fourth divided pixel (PSP4) can be de-illuminated at each of the first to third sub-pixels (SP1 to SP3) of the second pixel (PX2) of the first display device (PA1). In this case, the light-emitting area of ​​the second pixel (PX2) can be increased by the amount of the third divided pixel (PSP3) compared to the first pixel (PX1), and can be shifted in the second direction (Y-axis direction) by the amount of the third divided pixel (PSP3). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the first display device (PA1), there is an effect in that the arrangement of the light-emitting area is slightly shifted in the second direction (Y-axis direction).

[0215] In addition, among the first to third subpixels (SP1~SP3) of the second pixels (PX2) of the second display device (PA2), the first divided pixel (PSP1), the second divided pixel (PSP2), and the fourth divided pixel (PSP4) may emit light, and the third divided pixel (PSP3) may not emit light.

[0216] In one embodiment, the first divided pixel (PSP1), the second divided pixel (PSP2), and the fourth divided pixel (PSP4) can be illuminated and the third divided pixel (PSP3) can be de-illuminated at each of the first to third sub-pixels (SP1 to SP3) of the second pixel (PX2) of the second display device (PA2). In this case, the light-emitting area of ​​the second pixel (PX2) can be increased by the fourth divided pixel (PSP4) compared to the first pixel (PX1), and can be shifted by the fourth divided pixel (PSP4) in the opposite direction of the second direction (Y-axis direction). That is, when the first pixel (PX1) and the second pixel (PX2) emit light in the second display device (PA2), there is an effect in that the arrangement of the light-emitting areas is slightly shifted in the opposite direction of the second direction (Y-axis direction).

[0217] Consequently, the light-emitting area of ​​the second pixel (PX2) of the first display device (PA1) in the boundary area (BA) may be slightly moved in the second direction (Y-axis direction), and the light-emitting area of ​​the second pixel (PX2) of the second display device (PA2) may be slightly moved in the opposite direction of the second direction (Y-axis direction). This improves the visibility to the user of misalignment in the boundary area (BA) when the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the second display device (PA2) emit white light.

[0218] FIG. 16 is a schematic plan view of another embodiment showing area A of FIG. 7. FIG. 17 is a schematic plan view of another embodiment showing area B of FIG. 7. FIG. 16 and FIG. 17 are drawings for explaining how to prevent misalignment of a display device from being visible when a single subpixel representing a single color emits light.

[0219] Referring to FIG. 16, in one embodiment, unlike the aforementioned pixels (PX) emitting white light, the operation of subpixels for emitting a single color at each pixel (PX) is described as emitting green light.

[0220] Referring to FIG. 16, the first display device (PA1) and the third display device (PA3) may be misaligned in the first direction (X-axis direction). When the first display device (PA1) and the third display device (PA3) are misaligned in the first direction (X-axis direction), the second pixel (PX2) of the first display device (PA1) and the second pixel (PX2) of the third display device (PA3) may emit light only partially. An example is given in which the second sub-pixel (SP2) of each pixel (PX) emits green light, the first sub-pixel (SP1) emits red light, and the third sub-pixel (SP3) emits blue light.

[0221] In one embodiment, among the first pixels (PX1) of the first display device (PA1) and the third display device (PA3), the second subpixel (SP2) emits light, and the remaining first and third subpixels (SP1, SP3) do not emit light, thereby enabling the realization of green. Additionally, in the boundary region (BA), among the second pixels (PX2) of the first display device (PA1), the first subpixel (SP1) and the third subpixel (SP3) are entirely non-emitting light, and the second subpixel (PSP2) of the second subpixel (SP2) emits light, while the first subpixel (PSP1), the third subpixel (PSP3), and the fourth subpixel (PSP4) do not emit light.

[0222] As the third display device (PA3) is misaligned in the first direction (X-axis direction) relative to the first display device (PA1), the first pixel (PX1) and the second pixel (PX2) of the third display device (PA3) may also be misaligned in the first direction (X-axis direction) relative to the first pixel (PX1) and the second pixel (PX2) of the first display device (PA1). In this case, the user may perceive the boundary area (BA) between the first display device (PA1) and the third display device (PA3) as being bent.

[0223] In one embodiment, the second subpixel (SP2) of the second pixel (PX2) of the first display device (PA1) can emit light, while the first subpixel (PSP1), the third subpixel (PSP3), and the fourth subpixel (PSP4) can be de-emitted. In this case, the light-emitting area of ​​the second subpixel (SP2) of the second pixel (PX2) can be reduced by the first subpixel (PSP1) compared to the second subpixel (SP2) of the first pixel (PX1), and can be shifted by the first subpixel (PSP1) in the first direction (X-axis direction). That is, when the second subpixel (SP2) of the first pixel (PX1) and the second subpixel (SP2) of the second pixel (PX2) emit green light in the first display device (PA1), there is an effect in that the arrangement of the light-emitting area is slightly shifted in the first direction (X-axis direction).

[0224] In addition, the first subpixel (SP1) and the third subpixel (SP3) of the second pixels (PX2) of the third display device (PA3) may not emit light, the first divided pixel (PSP1) of the second subpixel (SP2) may emit light, and the second divided pixel (PSP2), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) may not emit light.

[0225] In one embodiment, the first divided pixel (PSP1) can be made to emit light from the second sub-pixel (SP3) of the second pixel (PX2) of the third display device (PA3), while the second divided pixel (PSP2), the third divided pixel (PSP3), and the fourth divided pixel (PSP4) can be made not to emit light. In this case, the light-emitting area of ​​the second sub-pixel (SP2) of the second pixel (PX2) can be made smaller than the second sub-pixel (SP2) of the first pixel (PX1) by the amount of the second divided pixel (PSP2), and can be moved by the amount of the second divided pixel (PSP2) in the opposite direction of the first direction (X-axis direction). That is, when the second sub-pixel (SP2) of the first pixel (PX1) and the second sub-pixel (SP2) of the second pixel (PX2) emit green light in the third display device (PA3), there is an effect in that the arrangement of the light-emitting area is moved slightly in the opposite direction of the first direction (X-axis direction).

[0226] Consequently, the light-emitting area of ​​the second sub-pixel (SP2) of the second pixel (PX2) of the first display device (PA1) in the boundary area (BA) may be slightly moved in the first direction (X-axis direction), and the light-emitting area of ​​the second pixel (SP2) of the second pixel (PX2) of the third display device (PA3) may be slightly moved in the opposite direction of the first direction (X-axis direction). This improves the visibility to the user of misalignment in the boundary area (BA) when the second sub-pixel (SP2) of the second pixel (PX2) of the first display device (PA1) and the second sub-pixel (SP2) of the second pixel (PX2) of the third display device (PA3) emit green light.

[0227] Referring to FIG. 17, in another example, the first display device (PA1) and the second display device (PA2) may be misaligned in the second direction (Y-axis direction). When the first display device (PA1) and the second display device (PA2) are misaligned in the second direction (Y-axis direction), the second sub-pixel (SP2) of the second pixel (PX2) of the first display device (PA1) and the second sub-pixel (SP2) of the second pixel (PX2) of the second display device (PA2) may emit light only partially.

[0228] In one embodiment, the second subpixel (SP2) of each of the first pixels (PX1) of the first display device (PA1) may emit green light, and the first subpixel (SP1) and the third subpixel (SP3) may not emit light. In addition, among the second pixels (PX2) of the first display device (PA1), the first subpixel (SP1) and the third subpixel (SP3) may not emit light, and the first divided pixel (PSP1), the second divided pixel (PSP2), and the fourth divided pixel (PSP4) of the second subpixel (SP2) may emit light, and the third divided pixel (PSP3) may not emit light.

[0229] As the second display device (PA2) is misaligned in the opposite direction of the second direction (Y-axis direction) in relation to the first display device (PA1), the second subpixel (SP2) of the first pixel (PX1) of the first display device (PA1) and the second subpixel (SP2) of the second pixel (PX2) of the second display device (PA2) may also be misaligned in the opposite direction of the second direction (Y-axis direction) in relation to the second subpixel (SP2) of the first pixel (PX1) and the second subpixel (SP2) of the second pixel (PX2). In this case, the user may perceive the boundary area (BA) between the first display device (PA1) and the second display device (PA2) as being bent.

[0230] In one embodiment, the first and third subpixels (SP1, SP3) of the second pixel (PX2) of the first display device (PA1) in the boundary region (BA) may be entirely non-emitting, and the first divided pixel (PSP1), the second divided pixel (PSP2), and the fourth divided pixel (PSP4) of the second subpixel (SP2) may be emitted while the third divided pixel (PSP3) may be non-emitting. In this case, the light-emitting area of ​​the second subpixel (SP2) of the second pixel (PX2) may be increased by the fourth divided pixel (PSP4) compared to the second subpixel (SP2) of the first pixel (PX1), and may be moved by the fourth divided pixel (PSP4) in the opposite direction of the second direction (Y-axis direction). That is, when the second sub-pixel (SP2) of the first pixel (PX1) and the second sub-pixel (SP2) of the second pixel (PX2) emit light in the first display device (PA1), there is an effect in that the arrangement of the light-emitting area is slightly moved in the opposite direction of the second direction (Y-axis direction).

[0231] In addition, the first and third subpixels (SP1, SP3) of the second pixels (PX2) of the second display device (PA2) may be entirely non-emitting, the first divided pixel (PSP1), the second divided pixel (PSP2), and the third divided pixel (PSP3) of the second subpixel (SP2) may emit light, and the fourth divided pixel (PSP4) may be non-emitting.

[0232] In one embodiment, the first divided pixel (PSP1), the second divided pixel (PSP2), and the third divided pixel (PSP3) can be illuminated at the second sub-pixel (SP2) of the second pixel (PX2) of the second display device (PA2), while the fourth divided pixel (PSP4) can be de-illuminated. In this case, the light-emitting area of ​​the second sub-pixel (SP2) of the second pixel (PX2) can be increased by the amount of the third divided pixel (PSP3) compared to the second sub-pixel (SP2) of the first pixel (PX1), and can be shifted in the second direction (Y-axis direction) by the amount of the third divided pixel (PSP3). That is, when the second sub-pixel (SP2) of the first pixel (PX1) and the second sub-pixel (SP2) of the second pixel (PX2) emit light in the second display device (PA2), there is an effect in that the arrangement of the light-emitting area is slightly shifted in the second direction (Y-axis direction).

[0233] Consequently, the light-emitting area of ​​the second sub-pixel (SP2) of the second pixel (PX2) of the first display device (PA1) in the boundary area (BA) may be slightly moved in the opposite direction of the second direction (Y-axis direction), and the light-emitting area of ​​the second sub-pixel (SP2) of the second pixel (PX2) of the second display device (PA2) may be slightly moved in the second direction (Y-axis direction). This improves the visibility to the user of misalignment in the boundary area (BA) when the second sub-pixel (SP2) of the second pixel (PX2) of the first display device (PA1) and the second sub-pixel (SP2) of the second pixel (PX2) of the second display device (PA2) emit green light.

[0234] In the embodiments of FIGS. 16 and 17, the operation of the second subpixel (SP2) emitting green light has been described, but it is not limited thereto, and the operation of the first subpixel (SP1) emitting red light and the third subpixel (SP3) emitting blue light can also operate in the same way. In addition, when the alignment of the first display device (PA1) and the third display device (PA3), and the first display device (PA1) and the second display device (PA2) is accurate, the third divided pixel (PSP3) and the fourth divided pixel (PSP4) of each subpixel (SP) may not emit light, and the first divided pixel (PSP1) and the second divided pixel (PSP2) may emit light.

[0235] FIG. 18 is a schematic plan view showing each pixel of a tile-type display device emitting white light according to a comparative example, and FIG. 19 is a schematic plan view showing each pixel of a tile-type display device emitting white light according to an embodiment.

[0236] Referring to FIGS. 18 and 19, each of the tile-type display devices according to the comparative example and the embodiment illustrates an example in which the third display device (PA3) is moved in the first direction (X-axis direction) and misaligned in the second direction (Y-axis direction) relative to the first display device (PA1). The comparative example has a structure in which the second pixels (PX2) placed in the boundary area (BA) are not divided into a plurality of sub-pixels, and the embodiment shows the light-emitting area when white light is emitted in the structure of FIG. 11 described above.

[0237] As illustrated in FIG. 18, it can be seen that the pixels (PX) of the first display device (PA1) and the third display device (PA3) are folded at the boundary between the first display device (PA1) and the third display device (PA3). On the other hand, referring to FIG. 19, the divided pixels (PSP) of the second pixel (PX2) at the boundary area (BA) may appear to be less visible as they compensate for the folded light-emitting area.

[0238] As described above, a tile-type display device according to one embodiment can realize a tile-type display device with excellent unity by improving the visibility of the boundary area by dividing second pixels placed in an adjacent boundary area of ​​a plurality of display devices into a plurality of divided pixels and emitting light differently depending on whether they are aligned.

[0239] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing the technical concept or essential features thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0240] TD: Tile-type display device PA1~PA4: First to fourth display devices PX1, PX2: 1st and 2nd pixels SP1~SP3: 1st to 3rd subpixels BA: Boundary area MA: Main area PSP1~PSP4: 1st divided pixel to 4th divided pixel

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