Display apparatus including light emitting device

Abstract

To provide a display device capable of reducing a quality difference of an image depending on a position of a user.SOLUTION: To provide a display device including a light emitting element. The light emitting device may be disposed on a light emitting region of the device substrate. A lower lens, a barrier pattern, and an upper lens may be disposed on the light emitting device. The lower lens and the upper lens overlapping the light emitting region may have curved surfaces that are convex toward each other. At least two of the lower lens, the barrier pattern, and the upper lens may include a color material. Accordingly, the display device can minimize a reduction in viewing angle and prevent color mixing.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a display device in which light-emitting elements are located on a light-emitting region of a device substrate. [Background technology]

[0002] Generally, a display device provides an image to a user. For example, the display device may include light-emitting elements positioned on light-emitting regions of a device substrate. The light-emitting elements in each light-emitting region may emit light of a specific color. For example, the light-emitting elements in each light-emitting region may include a light-emitting material layer positioned between a first electrode and a second electrode.

[0003] The image provided to the user may include various colors. For example, a color filter and a pixel lens may be located on the path of light emitted from the light emitting element in each light emitting region. Therefore, the display device can prevent color mixing. However, the pixel lens located on each light emitting region may reduce the viewing angle of the display device. Therefore, the quality of the image provided to the user may vary significantly depending on the user's position. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE INVENTION An object of the present invention is to provide a display device capable of reducing image quality differences depending on the user's position.

[0005] Another object of the present invention is to provide a display device that can minimize a reduction in the viewing angle of light emitted from each light-emitting region and prevent color mixing.

[0006] The problems to be solved by the present invention are not limited to those mentioned above, and problems not mentioned here will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] A display device according to the technical idea of ​​the present invention for achieving the above object includes an element substrate. Light-emitting elements are positioned on a light-emitting area of ​​the element substrate. A lower lens and a barrier pattern are positioned on the light-emitting elements. The lower lens overlaps the light-emitting area. The barrier pattern surrounds the edge of the lower lens. An upper lens is positioned on the lower lens and the barrier pattern. The upper lens includes a color material. The upper lens overlaps the light-emitting area. A surface of the lower lens facing the upper lens and a surface of the upper lens facing the lower lens have convex cross sections. The lower lens, one of the barrier patterns, and the upper lens include a color material that exhibits the same color.

[0008] The color material may include a dye or pigment that exhibits one of the colors red, green, and blue.

[0009] The refractive index of the barrier pattern may be smaller than the refractive index of the lower lens.

[0010] The thickness of the barrier pattern may be greater than the maximum thickness of the lower lens. The surface of the lower lens facing the upper lens may be in contact with the barrier pattern.

[0011] The surface of the upper lens facing the lower lens may be in contact with a lens planarizing film, the refractive index of which may be less than the refractive index of the upper lens.

[0012] The surface of the lens planarization film facing the device substrate may be in contact with the surface of the barrier pattern opposite the device substrate.

[0013] The lower and upper lenses may have a size larger than the light emitting area.

[0014] The size of the upper lens may be different from the size of the lower lens.

[0015] A display device according to the technical concept of the present invention to achieve another object of the present invention includes an element substrate. Light-emitting elements are located on a light-emitting region of the element substrate. A lower lens is located on the light-emitting elements. The lower lens has a first curved surface facing away from the element substrate. At least a portion of the first curved surface is surrounded by a barrier pattern. The barrier pattern includes a first color material. An upper lens is located on the lower lens and the barrier pattern. The upper lens has a second curved surface facing the first curved surface. The first curved surface and the second curved surface overlapping the light-emitting region have shapes that bulge toward each other. At least one of the lower lens and the upper lens includes a second color material that exhibits a color different from the first color material.

[0016] The barrier pattern may be located outside the light emitting area.

[0017] A lens planarization film may be located between the lower lens and the upper lens. The lens planarization film may have a lower refractive index than the lower lens.

[0018] The first curved surface of the lower lens may include a first region and a second region. The first region may contact the barrier pattern. The second region may contact the lens planarization film. The second region may be located closer to the center of the light-emitting region than the first region.

[0019] The first color substance may include a dye or pigment that exhibits the color black.

[0020] The top surface of the upper lens opposite the device substrate may be parallel to the bottom surface of the lower lens facing the device substrate.

[0021] The lens planarization layer may include a first planarization layer and a second planarization layer. The second planarization layer may be located on the first planarization layer. The first planarization layer may include a third color material that exhibits the same color as the second color material.

[0022] The second curved surface of the upper lens may have a different curvature than the first curved surface of the lower lens.

[0023] A display device according to the present invention includes a lower lens positioned on a light-emitting element, a barrier pattern, and an upper lens, the lower lens and the upper lens having surfaces that convex toward each other, the convex surface of the lower lens being partially surrounded by the barrier pattern, and at least two of the lower lens, the barrier pattern, and the upper lens containing a color material. Therefore, the display device according to the present invention can minimize a reduction in the viewing angle of light emitted from each light-emitting element and prevent color mixing. Therefore, the display device according to the present invention can reduce image quality variations due to user positions. Furthermore, the display device according to the present invention can reduce production energy through process optimization. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a diagram schematically illustrating a display device according to an embodiment of the present invention. [Figure 2] 2 is a diagram showing a circuit of each sub-pixel in a display panel of a display device according to an embodiment of the present invention; [Figure 3] 2 is a cross-sectional view of each pixel region in a display panel of a display device according to an embodiment of the present invention; [Figure 4] FIG. 4 is an enlarged view of the K1 region in FIG. 3. [Figure 5] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 7] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 8] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 9] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 10] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 11] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 12] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 13] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 14] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. [Figure 15] FIG. 10 is a diagram illustrating a display device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] The purpose, technical configuration, and operational effects of the present specification will be more clearly understood from the following detailed description with reference to the drawings illustrating examples of the present specification. The examples of the present specification are provided to fully convey the technical ideas of the present specification to those skilled in the art, and the present specification is not limited to the examples described below and may be embodied in other forms.

[0026] Furthermore, parts denoted by the same reference numerals throughout the specification refer to the same components, and in the drawings, the length and thickness of layers or regions may be exaggerated for convenience. Furthermore, when a first component is described as being "on" a second component, this includes not only the case where the first component is located above and in direct contact with the second component, but also the case where a third component is located between the first and second components.

[0027] Here, the terms "first," "second," etc. are used to describe various components and to distinguish one component from another, but the first and second components may be named arbitrarily for the convenience of those skilled in the art without departing from the technical spirit of this specification.

[0028] The terms used in the specification of this specification are used only to describe specific embodiments and are not intended to limit the technical ideas of the specification. For example, elements expressed in the singular include plural elements unless the context clearly dictates that only the singular element is used. Furthermore, in the specification of this specification, terms such as "include" or "have" are intended to specify the presence of features, numbers, steps, operations, elements, components, or combinations thereof described in the specification, and should be understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0029] Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this specification pertains. Terms, such as those defined in commonly used dictionaries, should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in the specification of this specification.

[0030] (Example) Fig. 1 is a diagram schematically illustrating a display device according to an embodiment of the present invention. Fig. 2 is a diagram illustrating a circuit of each sub-pixel in a display panel of the display device according to an embodiment of the present invention. Fig. 3 is a diagram illustrating a cross section of each pixel region in a display panel of the display device according to an embodiment of the present invention. Fig. 4 is an enlarged view of region K1 in Fig. 3.

[0031] 1 to 4, a display device according to an embodiment of the present invention may include a display panel DP. The display panel DP may generate an image to be provided to a user. For example, a number of pixel areas PA may be located within the display panel DP. Each pixel area PA may implement various colors. For example, each pixel area PA may include a number of sub-pixels SP that display different colors. Various signals may be applied to each sub-pixel SP via signal lines GL, DL, and PL. For example, the signal lines GL, DL, and PL may include a gate line GL that applies a gate signal, a data line DL that applies a data signal, and a power supply line PL that supplies a power supply voltage.

[0032] The gate lines GL may be electrically connected to a gate driver GD. The data lines DL may be electrically connected to a data driver DD. The gate driver GD and the data driver DD may be controlled by a timing controller TC. For example, the gate driver GD may receive a clock signal, a reset signal, and a start signal from the timing controller TC, and the data driver DD may receive digital video data and a source timing signal from the timing controller TC. The power supply voltage supply lines PL may be electrically connected to a power supply unit PU.

[0033] The display panel DP may include an active area AA and a bezel area BZ. The image provided to the user may be generated in the active area AA. For example, the plurality of pixel areas PA may be located within the active area AA of the display panel DP. The bezel area BZ may be located outside the active area AA. For example, the active area AA may be surrounded by the bezel area BZ. The gate driver GD, the data driver DD, the timing controller TC, and the power supply unit PU may be located outside the active area AA. For example, each of the signal lines GL, DL, and PL may include an area located on the bezel area BZ.

[0034] At least one of the gate driver GD, the data driver DD, the timing controller TC, and the power supply unit PU may be located on the bezel region BZ. For example, a display device according to an embodiment of the present invention may be a GIP (Gate-In-Panel) type display device in which the gate driver GD is formed on the bezel region BZ.

[0035] Each subpixel SP may emit light exhibiting a specific color. For example, a driving circuit DC electrically connected to the light-emitting element 300 may be located within each subpixel SP. The driving circuit DC of each subpixel SP may be electrically connected to the signal lines GL, DL, and PL. For example, the driving circuit DC of each subpixel SP may generate a driving current corresponding to the data signal in response to the gate signal. The driving current generated by the driving circuit DC of each subpixel SP may be supplied to the light-emitting element 300 of the subpixel SP during one frame. For example, the driving circuit DC of each subpixel SP may include a first thin film transistor TR1, a second thin film transistor TR2, and a storage capacitor Cst.

[0036] The driving circuit DC and the light emitting element 300 of each sub-pixel SP may be supported by a device substrate 100. The device substrate 100 may include various materials. For example, the device substrate 100 may be a wafer formed of a semiconductor material such as silicon. The driving circuit DC of each sub-pixel SP may include an area located within the device substrate 100. Therefore, the display device according to an embodiment of the present invention may improve the density of the driving circuit DC located in each sub-pixel SP.

[0037] The first thin film transistor TR1 of each subpixel SP can transmit the data signal to the second thin film transistor TR2 of the subpixel SP in response to the gate signal. For example, the first thin film transistor TR1 of each subpixel SP can function as a switching transistor. The first thin film transistor TR1 of each subpixel SP can include a first well region, a first drain region, a first source region, a first gate electrode, a first drain electrode, and a first source electrode. For example, the first gate electrode of each subpixel SP can be electrically connected to the corresponding gate line GL, and the first drain electrode of each subpixel SP can be electrically connected to the corresponding data line DL.

[0038] The first well region, the first drain region, and the first source region may be located within the device substrate 100. For example, the first well region, the first drain region, and the first source region may be formed by doping a conductive impurity into a portion of the device substrate 100. The first drain region and the first source region may contain a different type of conductive impurity than the first well region. For example, the first well region may contain P-type impurities, and the first drain region and the first source region may contain N-type impurities. The first drain region and the first source region may be formed within the first well region. The first source region may be separated from the first drain region.

[0039] The first gate electrode may be located on the device substrate 100. The first gate electrode may be located between the first drain region and the first source region. For example, a portion of the first well region located between the first drain region and the first source region may overlap with the first gate electrode. The first gate electrode may include a conductive material. For example, the first gate electrode may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The first gate electrode may be spaced apart from the device substrate 100. The first gate electrode may be insulated from the device substrate 100. For example, the first drain region may be electrically connected to the first source region by a voltage applied to the first gate electrode. That is, in the display device according to the embodiment of the present invention, a portion of the first well region located between the first drain region and the first source region may function as a first channel region of the first thin film transistor TR1. Therefore, the display device according to the embodiment of the present invention may improve the electrical characteristics of the first thin film transistor TR1.

[0040] The first drain electrode may be located on the device substrate 100. The first drain electrode may be electrically connected to the first drain region. The first drain electrode may include a conductive material. For example, the first drain electrode may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The first drain electrode may include a material different from that of the first gate electrode. For example, the first drain electrode may be located on a different layer from that of the first gate electrode. The first drain electrode may be insulated from the first gate electrode.

[0041] The first source electrode may be located on the device substrate 100. The first source electrode may be electrically connected to the first source region. The first source electrode may include a conductive material. For example, the first source electrode may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The first source electrode may include a material different from that of the first gate electrode. For example, the first source electrode may be located on a different layer from that of the first gate electrode. The first source electrode may be insulated from the first gate electrode.

[0042] The first source electrode may be located on the same layer as the first drain electrode. The first source electrode may be spaced apart from the first drain electrode. The first source electrode may include the same material as the first drain electrode. The first source electrode may be formed by the same process as the first drain electrode. For example, the first source electrode may be formed simultaneously with the first drain electrode. Therefore, the display device according to the embodiment of the present invention can improve process efficiency.

[0043] The second thin film transistor TR2 of each subpixel SP may generate the driving current corresponding to the data signal. For example, the second thin film transistor TR2 of each subpixel SP may function as a driving transistor. The second thin film transistor TR2 of each subpixel SP may include a second well region 102w, a second drain region 102d, a second source region 102s, a second gate electrode 223, a second drain electrode 225, and a second source electrode 227. For example, the second gate electrode 223 of each subpixel SP may be electrically connected to the first source electrode of the subpixel SP, and the second drain electrode 225 of each subpixel SP may be electrically connected to the power supply voltage supply line PL. The light emitting element 300 of each subpixel SP may be electrically connected to the second source electrode 227 of the subpixel SP.

[0044] The second well region 102w, the second drain region 102d, and the second source region 102s may be located within the device substrate 100. For example, the second well region 102w, the second drain region 102d, and the second source region 102s may be formed by doping a portion of the device substrate 100 with conductive impurities. The second drain region 102d and the second source region 102s may contain a different type of conductive impurity than the second well region 102w. For example, the second well region 102w may contain N-type impurities, and the second drain region 102d and the second source region 102s may contain P-type impurities. Therefore, in the display device according to this embodiment, the second thin film transistor TR2 of each subpixel SP may have different electrical characteristics from the first thin film transistor TR1 of each subpixel SP. The second drain region 102d and the second source region 102s may be formed within the second well region 102w. The second source region 102s may be spaced apart from the second drain region 102d.

[0045] The second well region 102w may contain the same conductive impurities as the first drain region and the first source region, and the second drain region 102d and the second source region 102s may contain the same conductive impurities as the first well region. For example, the second well region 102w may be formed simultaneously with the first drain region and the first source region, and the second drain region 102d and the second source region 102s may be formed simultaneously with the first well region. Therefore, the display device according to this embodiment may improve process efficiency.

[0046] The second gate electrode 223 may be located on the device substrate 100. The second gate electrode 223 may be located between the second drain region 102d and the second source region 102s. For example, a portion of the second well region 102w located between the second drain region 102d and the second source region 102s may overlap with the second gate electrode 223. The second gate electrode 223 may include a conductive material. For example, the second gate electrode 223 may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The second gate electrode 223 may be spaced apart from the device substrate 100. The second gate electrode 223 may be insulated from the device substrate 100. For example, a portion of the second well region 102w located between the second drain region 102d and the second source region 102s may have electrical conductivity corresponding to a voltage applied to the second gate electrode 223. That is, in the display device according to the embodiment of the present invention, a portion of the second well region 102w overlapping with the second gate electrode 223 can function as a second channel region of the second thin film transistor TR2, thereby improving the electrical characteristics of the second thin film transistor TR2.

[0047] The second gate electrode 223 may be located on the same layer as the first gate electrode. The second gate electrode 223 may include the same material as the first gate electrode. The second gate electrode 223 may be formed by the same process as the first gate electrode. For example, the second gate electrode 223 may be formed simultaneously with the first gate electrode. Therefore, the display device according to this embodiment may improve process efficiency.

[0048] The second drain electrode 225 may be located on the device substrate 100. The second drain electrode 225 may be electrically connected to the second drain region 102d. The second drain electrode 225 may include a conductive material. For example, the second drain electrode 225 may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The second drain electrode 225 may include a different material from the second gate electrode 223. For example, the second drain electrode 225 may be located on a different layer from the second gate electrode 223. The second drain electrode 225 may be insulated from the second gate electrode 223.

[0049] The second drain electrode 225 may be located on the same layer as the first drain electrode. The second drain electrode 225 may include the same material as the first drain electrode. The second drain electrode 225 may be formed by the same process as the first drain electrode. For example, the second drain electrode 225 may be formed simultaneously with the first drain electrode. Therefore, the display device according to this embodiment can improve process efficiency.

[0050] The second source electrode 227 may be located on the device substrate 100. The second source electrode 227 may be electrically connected to the second source region 102s. The second source electrode 227 may include a conductive material. For example, the second source electrode 227 may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The second source electrode 227 may include a different material from the second gate electrode 223. For example, the second source electrode 227 may be located on a different layer from the second gate electrode 223. The second source electrode 227 may be insulated from the second gate electrode 223.

[0051] The second source electrode 227 may be located on the same layer as the second drain electrode 225. The second source electrode 227 may be spaced apart from the second drain electrode 225. The second source electrode 227 may include the same material as the second drain electrode 225. The second source electrode 227 may be formed by the same process as the second drain electrode 225. For example, the second source electrode 227 may be formed simultaneously with the second drain electrode 225. Therefore, the display device according to this embodiment may improve process efficiency.

[0052] The storage capacitor Cst of each subpixel SP can maintain the voltage applied to the second gate electrode 223 of the subpixel SP for one frame. For example, the storage capacitor Cst of each subpixel SP can be electrically connected to the second gate electrode 223 and the second source electrode 227 located in the subpixel SP. The storage capacitor Cst of each subpixel SP can have a stacked capacitor electrode structure. For example, the storage capacitor Cst of each subpixel SP can include a first capacitor electrode electrically connected to the second gate electrode 223 of the subpixel SP and a second capacitor electrode electrically connected to the second source electrode 227 of the subpixel SP. The storage capacitor Cst of each subpixel SP can be formed using the same process as forming the first thin film transistor TR1 and the second thin film transistor TR2 located in the subpixel SP. For example, the first capacitor electrode of each subpixel SP can be formed simultaneously with the second gate electrode 223 of the subpixel SP, and the second capacitor electrode of each subpixel SP can be formed simultaneously with the second source electrode 227 of the subpixel SP. Therefore, the display device according to the embodiment of the present invention can improve process efficiency.

[0053] At least one insulating layer 110, 120, 130, 140 for preventing unnecessary electrical connection may be formed on the device substrate 100. For example, a gate insulating layer 110, an interlayer insulating layer 120, a device planarization layer 130, and a fence 140 may be formed on the device substrate 100.

[0054] The gate insulating layer 110 may be disposed on the device substrate 100. The first and second gate electrodes 223 of each subpixel SP may be insulated from the device substrate 100 by the gate insulating layer 110. For example, the top surface of the device substrate 100 facing the first and second gate electrodes 223 of each subpixel SP may be covered by the gate insulating layer 110. The first and second gate electrodes 223 of each subpixel SP may be disposed on the gate insulating layer 110. The gate insulating layer 110 may include an insulating material. For example, the gate insulating layer 110 may include an inorganic insulating material such as silicon oxide (SiOx) and silicon nitride (SiNx). The distance between the device substrate 100 and the second gate electrode 223 of each subpixel SP may be the same as the distance between the device substrate 100 and the first gate electrode of each subpixel SP. For example, the gate insulating layer 110 may be a linear insulating layer having a constant thickness.

[0055] The interlayer insulating film 120 may be disposed on the gate insulating film 110. The first drain electrode and the first source electrode of each subpixel SP may be insulated from the first gate electrode of the subpixel SP by the interlayer insulating film 120. The second drain electrode 225 and the second source electrode 227 of each subpixel SP may be insulated from the second gate electrode 223 of the subpixel SP by the interlayer insulating film 120. For example, the interlayer insulating film 120 may cover the first gate electrode and the second gate electrode 223 of each subpixel SP. The first drain electrode, the first source electrode, the second drain electrode 225, and the second source electrode 227 of each subpixel SP may be disposed on the interlayer insulating film 120. The interlayer insulating film 120 may include an insulating material. For example, the interlayer insulating film 120 may include an inorganic insulating material.

[0056] The device planarization layer 130 may be disposed on the interlayer insulating layer 120. The device planarization layer 130 may eliminate steps due to the driving circuits DC of each subpixel SP. For example, the top surface of the device planarization layer 130 opposite the device substrate 100 may be flat. The top surface of the device planarization layer 130 may be parallel to the top surface of the device substrate 100. The first drain electrode, the first source electrode, the second drain electrode 225, and the second source electrode 227 of each subpixel SP may be covered by the device planarization layer 130. The device planarization layer 130 may include an insulating material. The device planarization layer 130 may include a different material from the interlayer insulating layer 120. The device planarization layer 130 may include a material with relatively high fluidity. For example, the device planarization layer 130 may include an organic insulating material.

[0057] The light emitting element 300 of each subpixel SP may be located on the device planarization layer 130. The light emitting element 300 of each subpixel SP may generate and emit light corresponding to the driving current generated by the driving circuit DC of the subpixel SP. For example, the light emitting element 300 of each subpixel SP may include a first electrode 310, a light emitting unit 320, and a second electrode 330, which are sequentially stacked on the device planarization layer 130 of the subpixel SP.

[0058] The first electrode 310 may include a conductive material. The first electrode 310 may include a material with high reflectivity. For example, the first electrode 310 may include a metal such as aluminum (Al) or silver (Ag). The first electrode 310 may have a multi-layer structure. For example, the first electrode 310 may have a structure in which a reflective electrode made of a metal is located between transparent electrodes made of a transparent conductive material such as ITO or IZO.

[0059] The light emitting unit 320 may generate and emit light having a brightness corresponding to a voltage difference between the first electrode 310 and the second electrode 330. For example, the light emitting unit 320 may include an emission material layer (EML). The emission material layer may include an organic light emitting material, an inorganic light emitting material, or a hybrid light emitting material. For example, a display device according to an embodiment of the present invention may be an organic light emitting display device including an organic light emitting material.

[0060] The light-emitting unit 320 may include multiple light-emitting material layers. For example, the light-emitting unit 320 may include a first light-emitting stack 321, a charge generation layer 322, and a second light-emitting stack 323, which are stacked in order. Each of the first light-emitting stack 321 and the second light-emitting stack 323 may include at least one light-emitting material layer. The charge generation layer 322 may supply electrons or holes to the first light-emitting stack 321 and the second light-emitting stack 323. For example, the first light-emitting stack 321 and the second light-emitting stack 323 may emit light. The light-emitting material layer of the second light-emitting stack 323 may include a different material from the light-emitting material layer of the first light-emitting stack 321. For example, the light generated by the second light-emitting stack 323 may exhibit a different color from the light generated by the first light-emitting stack 321. The light emitted from the light-emitting unit 320 may be a mixture of the light generated by the first light-emitting stack 321 and the light generated by the second light-emitting stack 323.

[0061] Each of the first light-emitting stack 321 and the second light-emitting stack 323 may include at least one functional layer. The functional layer may be a layer that smoothly supplies holes or electrons to the light-emitting material layer. For example, the functional layer may be one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). Therefore, the display device according to this embodiment may improve the efficiency of the light-emitting unit 320.

[0062] The second electrode 330 may include a conductive material. The second electrode 330 may include a material different from that of the first electrode 310. The transmittance of the second electrode 330 may be greater than that of the first electrode 310. For example, the second electrode 330 may be a transparent electrode made of a transparent conductive material such as ITO or IZO, or a semi-transparent electrode formed with a thin metal such as silver (Ag) or magnesium (Mg). Therefore, in the display device according to the embodiment of the present invention, light generated by the light emitting unit 320 of each sub-pixel SP may be emitted to the outside through the second electrode 330 of the sub-pixel SP.

[0063] The first electrode 310 of each subpixel SP may be electrically connected to the second source electrode 227 of the subpixel SP. For example, the first electrode 310 of each subpixel SP may penetrate the device planarization layer 130 and directly contact the second source electrode 227 of the subpixel SP. The light emitting element 300 of each subpixel SP may be independently controlled. For example, the first electrode 310 of each subpixel SP may be insulated from the first electrode 310 of an adjacent subpixel SP. The first electrode 310 of each subpixel SP may be spaced apart from the first electrode 310 of an adjacent subpixel SP. For example, an edge of the first electrode 310 located in each subpixel SP may be covered by the fence 140 located on the device planarization layer 130. The fence 140 may include an insulating material. For example, the fence 140 may include an inorganic insulating material.

[0064] The fence 140 may partially expose the light-emitting regions R-EA, B-EA, and G-EA of the first electrode 310 of each subpixel SP. For example, the fence 140 may define light-emitting regions R-EA, B-EA, and G-EA within each subpixel SP. A portion of the first electrode 310 overlapping the light-emitting regions R-EA, B-EA, and G-EA of each subpixel SP may directly contact the top surface of the device planarization layer 130. The light-emitting unit 320 and the second electrode 330 of each subpixel SP may be stacked on a portion of the first electrode 310 overlapping the light-emitting regions R-EA, B-EA, and G-EA of the corresponding subpixel SP. Therefore, the display device according to this embodiment may prevent brightness deviation due to the generation position of light emitted from the light-emitting regions R-EA, B-EA, and G-EA of each subpixel SP.

[0065] Light emitted from the light emitting element 300 of each subpixel SP may exhibit the same color as light emitted from the light emitting element 300 of an adjacent subpixel SP. For example, the light emitting element 300 of each subpixel SP may emit white light. The light emitting unit 320 of each subpixel SP may have the same stack structure as the light emitting unit 320 of the adjacent subpixel SP. For example, the first light emitting stack 321, the charge generation layer 322, and the second light emitting stack 323 of each subpixel SP may be formed by the same process as the first light emitting stack 321, the charge generation layer 322, and the second light emitting stack 323 of the adjacent subpixel SP. The light emitting unit 320 of each subpixel SP may be formed simultaneously with the light emitting unit 320 of the adjacent subpixel SP. Therefore, the display device according to an embodiment of the present invention may improve process efficiency.

[0066] The area between the light-emitting areas R-EA, B-EA, and G-EA may be defined as a non-light-emitting area NEA. For example, the fence 140 may be located on the non-light-emitting area NEA. An isolation trench ST may be located in the non-light-emitting area NEA. For example, the isolation trench ST may be located between the fences 140. The isolation trench ST may be formed in the device planarization layer 130. For example, the isolation trench ST may have a groove shape in which a portion of the device planarization layer 130 is removed. The isolation trench ST may extend toward the device substrate 100. The light-emitting unit 320 of each sub-pixel SP may be partially separated from the light-emitting unit 320 of an adjacent sub-pixel SP by the isolation trench ST. For example, the first light-emitting stack 321 and the charge generation layer 322 of each sub-pixel SP may be separated from the first light-emitting stack 321 and the charge generation layer 322 of the adjacent sub-pixel SP by the isolation trench ST. The second light-emitting stack 323 of each sub-pixel SP may be in direct contact with the second light-emitting stack 323 of an adjacent sub-pixel SP. For example, an air gap AR may be formed in the isolation trench ST. Therefore, the display device according to the embodiment of the present invention can prevent the driving current from leaking through the charge generation layer 322 of each sub-pixel SP. Therefore, the display device according to the embodiment of the present invention can prevent malfunction of the light-emitting element 300 located in each sub-pixel SP due to leakage current.

[0067] The voltage applied to the second electrode 330 of each subpixel SP may be the same as the voltage applied to the second electrode 330 of an adjacent subpixel SP. For example, the second electrode 330 of each subpixel SP may be electrically connected to the second electrode 330 of the adjacent subpixel SP. The second electrode 330 of each subpixel SP may include the same material as the second electrode 330 of the adjacent subpixel SP. For example, the second electrode 330 of each subpixel SP may be formed simultaneously with the second electrode 330 of the adjacent subpixel SP. The second electrode 330 of each subpixel SP may be in direct contact with the second electrode 330 of the adjacent subpixel SP. For example, the second electrode 330 of each subpixel SP may include an area overlapping the isolation trench ST. Therefore, the display device according to this embodiment may simplify the process of forming the second electrode 330 of each subpixel SP. Furthermore, the display device according to the embodiment of the present invention can control the brightness of the light emitted from the light emitting device 300 of each sub-pixel SP according to the data signal applied to the driving circuit DC of the corresponding sub-pixel SP.

[0068] An encapsulating structure 400 may be disposed on the light emitting device 300 of each subpixel SP. The encapsulating structure 400 may prevent damage to the light emitting device 300 due to external moisture and impact. The encapsulating structure 400 may have a multi-layer structure. For example, the encapsulating structure 400 may include a first encapsulating layer 410, a second encapsulating layer 420, and a third encapsulating layer 430, which are sequentially stacked. The first encapsulating layer 410, the second encapsulating layer 420, and the third encapsulating layer 430 may include an insulating material. The second encapsulating layer 420 may include a different material from the first encapsulating layer 410 and the third encapsulating layer 430. For example, the first encapsulating layer 410 and the third encapsulating layer 430 may be inorganic encapsulating layers containing an inorganic insulating material, and the second encapsulating layer 420 may be an organic encapsulating layer containing an organic insulating material. Steps caused by the light emitting device 300 of each subpixel SP may be eliminated by the second encapsulating layer 420. For example, the top surface of the encapsulation structure 400 opposite to the device substrate 100 may be a flat surface. The top surface of the encapsulation structure 400 may be parallel to the top surface of the device substrate 100. Therefore, the display device according to the embodiment of the present invention can effectively prevent damage to the light emitting device 300 due to external moisture and impact.

[0069] A lower lens 500 may be positioned on the encapsulating structure 400. The lower lens 500 may overlap the subpixels SP. For example, the light-emitting regions R-EA, B-EA, and G-EA of each subpixel SP may overlap one of the lower lenses 500. The lower lens 500 positioned on each subpixel SP may be positioned on a path of light emitted from the light-emitting element 300 of the corresponding subpixel SP. A surface 500s of each lower lens 500 opposite to the device substrate 100 may have a curved shape. For example, the surface 500s of each lower lens 500 may have a cross section that bulges toward the side opposite to the device substrate 100. Therefore, in the display device according to the embodiment of the present invention, the lower lens 500 may function as a convex lens. That is, in the display device according to the embodiment of the present invention, light emitted from the light-emitting element 300 of each subpixel SP may be collected by the lower lens 500 of the corresponding subpixel SP.

[0070] The lower surface of each lower lens 500 facing the device substrate 100 may be flat. For example, the cross section of each lower lens 500 may have a semicircular shape. The lower surface of each lower lens 500 may be in direct contact with the upper surface of the encapsulating structure 400. The maximum size of the lower lens 500 located on each subpixel SP may be larger than the size of the light-emitting areas R-EA, B-EA, and G-EA defined in the subpixel SP. For example, the lower surface of the lower lens 500 located on each subpixel SP may be larger than the light-emitting areas R-EA, B-EA, and G-EA of the subpixel SP. The lower surface of the lower lens 500 located on each subpixel SP may be continuous with the lower surface of the lower lens 500 located on an adjacent subpixel SP. For example, the outermost region of the lower lens 500 located on each subpixel SP may be in contact with the outermost region of the lower lens 500 located on the adjacent subpixel SP. Therefore, in the display device according to the embodiment of the present invention, all the light emitted from the light emitting element 300 of each sub-pixel SP can be collected by the lower lens 500 of the sub-pixel SP.

[0071] A barrier pattern 600 may be positioned on the lower lens 500. For example, the convex surface 500s of each lower lens 500 may be covered with the barrier pattern 600. The barrier pattern 600 may overlap the sub-pixel SP. For example, the barrier pattern 600 of each sub-pixel SP may be in direct contact with the convex surface 500s of the lower lens 500 located above the sub-pixel SP. The barrier pattern 600 of each sub-pixel SP may have a refractive index smaller than that of the lower lens 500 of the sub-pixel SP. Therefore, the display device according to this embodiment may refract light emitted from the light-emitting element 300 of each sub-pixel SP toward the inside of the light-emitting areas R-EA, B-EA, and G-EA defined within the sub-pixel SP at the boundary between the lower lens 500 located above the sub-pixel SP and the barrier pattern 600. Therefore, in the display device according to an embodiment of the present invention, the amount of light traveling from the light-emitting element 300 of each sub-pixel SP toward the adjacent sub-pixel SP can be reduced by the lower lens 500 and the barrier pattern 600 located on the sub-pixel SP.

[0072] The barrier pattern 600 of each subpixel SP may include a color material. The color material may refer to a material capable of implementing a specific color using light passing therethrough. For example, the color material may include a dye or a pigment. The barrier pattern 600 of each subpixel SP may be larger than the light-emitting areas R-EA, B-EA, and G-EA of the subpixel SP. For example, the barrier pattern 600 of each subpixel SP may have the same size as the bottom surface of the lower lens 500 located on the subpixel SP. A side surface of the barrier pattern 600 located on each subpixel SP may contact a side surface of the barrier pattern 600 located on an adjacent subpixel SP. A boundary of the barrier pattern 600 may be located on the non-light-emitting area NEA. Therefore, in the display device according to an embodiment of the present invention, all light emitted from the light-emitting element 300 of each subpixel SP can pass through the barrier pattern 600 of the subpixel SP.

[0073] The barrier pattern 600 of each sub-pixel SP may include a color material that represents the color of the sub-pixel SP. The barrier pattern 600 of each sub-pixel SP may include a color material that represents a different color from the barrier pattern 600 of an adjacent sub-pixel SP. For example, each sub-pixel SP may include one of a red light-emitting region R-EA for realizing red, a blue light-emitting region B-EA for realizing blue, and a green light-emitting region G-EA for realizing green, and light passing through the barrier pattern 600 of each sub-pixel SP may include a dye or pigment that represents one of red, blue, and green. That is, in the display device according to the embodiment of the present invention, light emitted from the light-emitting element 300 of each sub-pixel SP may exhibit a specific color depending on the barrier pattern 600 of the sub-pixel SP. Therefore, in the display device according to the embodiment of the present invention, the barrier pattern 600 may block light L1 traveling from the light-emitting element 300 of each sub-pixel SP toward the barrier pattern 600 of the adjacent sub-pixel SP. For example, light passing through the barrier pattern 600 located over the blue light-emitting area B-EA of each pixel area PA cannot pass through the barrier pattern 600 located over the red light-emitting area R-EA of the pixel area PA or the barrier pattern 600 located over the green light-emitting area G-EA of the pixel area PA. Therefore, the display device according to the embodiment of the present invention can prevent color mixing.

[0074] An upper lens 700 may be positioned on the barrier pattern 600. The upper lens 700 may overlap the subpixel SP. For example, each upper lens 700 may overlap one of the lower lenses 500. The upper lens 700 of each subpixel SP may have a size larger than the light-emitting areas R-EA, B-EA, and G-EA of the corresponding subpixel SP. For example, the maximum size of the upper lens 700 positioned on each subpixel SP may be the same as the size of the barrier pattern 600 positioned on the corresponding subpixel SP. The outermost region of the upper lens 700 positioned on each subpixel SP may contact the outermost region of the upper lens 700 positioned on an adjacent subpixel SP. For example, the maximum size of the upper lens 700 positioned on each subpixel SP may be the same as the maximum size of the lower lens 500 positioned on the corresponding subpixel SP. Therefore, the display device according to the embodiment of the present invention can emit light collected by the lower lens 500 of each sub-pixel SP to the outside through the upper lens 700 of the corresponding sub-pixel SP.

[0075] The upper lens 700 may include a color material. The upper lens 700 of each sub-pixel SP may include a color material that represents the color to be implemented by the sub-pixel SP. For example, the upper lens 700 of each sub-pixel SP may include a color material that represents the same color as the barrier pattern 600 of the sub-pixel SP. That is, in the display device according to the embodiment of the present invention, the upper lens 700 of each sub-pixel SP may include a color material that represents a different color from the upper lens 700 of an adjacent sub-pixel SP. Therefore, in the display device according to the embodiment of the present invention, the barrier pattern 600 and the upper lens 700 may block light L2 traveling from the light emitting element 300 of each sub-pixel SP toward the upper lens 700 of the adjacent sub-pixel SP. For example, light passing through the barrier pattern 600 located over the blue light-emitting area B-EA of each pixel area PA cannot pass through the upper lens 700 located over the red light-emitting area R-EA of the pixel area PA and the upper lens 700 located over the green light-emitting area G-EA of the pixel area PA. Therefore, the display device according to the embodiment of the present invention can effectively prevent color mixing.

[0076] The barrier pattern 600 and the upper lens 700 located over each sub-pixel SP may contain the same color material. For example, light passing through the barrier pattern 600 located over the blue light-emitting region B-EA may have the same peak wavelength as light passing through the upper lens 700 located over the blue light-emitting region B-EA. Therefore, the display device according to the embodiment of the present invention may have improved color perception.

[0077] A surface 700s of each upper lens 700 facing the device substrate 100 may have a curved shape. For example, the surface 700s of each upper lens 700 may have a cross section that convex toward the device substrate 100. The upper lens 700 of each subpixel SP may be spaced apart from the barrier pattern 600 of the corresponding subpixel SP. For example, the convex surface 700s of each upper lens 700 may be covered with a lens planarizing layer 800. The lens planarizing layer 800 may include an insulating material. The lens planarizing layer 800 may include a transparent material. For example, the lens planarizing layer 800 may include an organic insulating material. The lens planarizing layer 800 may extend between the barrier pattern 600 and the upper lens 700 of each subpixel SP. For example, the lens planarization film 800 may be in direct contact with the upper surface of the barrier pattern 600 opposite the device substrate 100 and the convex surface 700 s of each upper lens 700 .

[0078] The lens planarization layer 800 may have a refractive index smaller than that of each upper lens 700. Therefore, in the display device according to the embodiment of the present invention, light L3 passing through the lower lens 500 and the barrier pattern 600 of each subpixel SP may be refracted toward the outside of the light-emitting regions R-EA, B-EA, and G-EA defined within the subpixel SP at the boundary between the lens planarization layer 800 and the upper lens 700 of the subpixel SP. That is, in the display device according to the embodiment of the present invention, the upper lens 700 of each subpixel SP may function as a concave lens. For example, in the display device according to the embodiment of the present invention, light emitted from the light-emitting element 300 of each subpixel SP is collected by the lower lens 500 located above the subpixel SP, and the light collected by the lower lens 500 of each subpixel SP may be diffused by the upper lens 700 of the subpixel SP. Therefore, in the display device according to the embodiment of the present invention, the viewing angle of light emitted from each subpixel SP may be widened by the upper lens 700 of the subpixel SP.

[0079] The upper surface of each upper lens 700 facing the device substrate 100 may be flat. For example, the cross section of each upper lens 700 may be semicircular. The upper lens 700 of each subpixel SP may have a shape corresponding to the lower lens 500 of the corresponding subpixel SP. For example, the upper surface of the upper lens 700 located on each subpixel SP may be parallel to the lower surface of the lower lens 500 located on the corresponding subpixel SP. The upper surface of the upper lens 700 located on each subpixel SP may be continuous with the upper surface of the upper lens 700 located on an adjacent subpixel SP. Therefore, in the display device according to the embodiment of the present invention, light passing through the upper lens 700 of each subpixel SP may have the same viewing angle. Therefore, the display device according to the embodiment of the present invention may prevent degradation of image quality due to differences in viewing angles between subpixels SP.

[0080] A lens protective layer 900 may be disposed on the upper lens 700. The lens protective layer 900 may prevent damage to the upper lens 700 due to external impact and moisture. The lens protective layer 900 may include an insulating material. For example, the lens protective layer 900 may include an inorganic insulating material.

[0081] As a result, the display device according to this embodiment of the present invention includes the lower lens 500, the barrier pattern 600, and the upper lens 700 located over the light-emitting element 300 of each sub-pixel SP, where the lower lens 500 of each sub-pixel SP, functioning as a convex lens, and the upper lens 700 of each sub-pixel SP, functioning as a concave lens, are bulged toward each other, the convex surface 500s of the lower lens 500 located over each sub-pixel SP is covered by the barrier pattern 600 of the sub-pixel SP, and the barrier pattern 600 and the upper lens 700 of each sub-pixel SP may contain a color material that exhibits the same color as the sub-pixel SP. Therefore, the display device according to this embodiment of the present invention can prevent color mixing and widen the viewing angle of light emitted from the light-emitting element 300 of each sub-pixel SP. Therefore, the display device according to this embodiment of the present invention can reduce image quality variations due to a user's position.

[0082] Furthermore, in the display device according to the embodiment of the present invention, the barrier pattern 600 and the upper lens 700 of each sub-pixel SP can function as a color filter. That is, the display device according to the embodiment of the present invention can omit the processes of forming a color filter and a black matrix. Therefore, the display device according to the embodiment of the present invention can minimize a decrease in process efficiency due to the formation of the barrier pattern 600 and the upper lens 700. Therefore, the display device according to the embodiment of the present invention can reduce generated energy through process optimization.

[0083] In the display device according to an embodiment of the present invention, the driving circuit DC of each subpixel SP is described as being composed of the first thin film transistor TR1, the second thin film transistor TR2, and the storage capacitor Cst. However, in a display device according to another embodiment of the present invention, the driving circuit DC of each subpixel SP may include a driving transistor and at least one switching transistor. For example, in a display device according to another embodiment of the present invention, the driving circuit DC of each subpixel SP may further include a third thin film transistor for initializing the storage capacitor Cst of the corresponding subpixel SP in response to a gate signal. The third thin film transistor of each subpixel SP may include a third well region, a third drain region, a third source region, a third gate electrode, a third drain electrode, and a third source electrode. The third well region, the third drain region, and the third source region may be formed within the device substrate 100. The third gate electrode of each sub-pixel SP may be electrically connected to the corresponding gate line GL, the third drain electrode of each sub-pixel SP may be electrically connected to an initialization line that applies an initialization signal, and the third source electrode of each sub-pixel SP may be electrically connected to the storage capacitor Cst of the sub-pixel SP. Thus, in the display device according to another embodiment of the present invention, the degree of freedom in configuring each driving circuit DC may be improved.

[0084] In the display device according to the embodiment of the present invention, the first drain electrode, the first source electrode, the second drain electrode 225, and the second source electrode 227 of each drive circuit DC may have other positions and electrical connections depending on the configuration of the drive circuit DC and / or the type of the thin film transistors TR1 and TR2. For example, in the display device according to the other embodiment of the present invention, the second gate electrode 223 of each drive circuit DC may be electrically connected to the first drain electrode of the drive circuit DC. Therefore, the display device according to the other embodiment of the present invention can have improved flexibility in the configuration of each drive circuit DC and the type of each thin film transistor TR1 and TR2.

[0085] In the display device according to this embodiment of the present invention, the first well region, the second drain region 102d, and the second source region 102s of each subpixel SP contain P-type impurities, and the first drain region, the first source region, and the second well region 102w of each subpixel SP contain N-type impurities. However, in a display device according to another embodiment of the present invention, the second well region 102w of each subpixel SP may contain the same type of conductive impurities as the first well region of the subpixel SP. For example, in a display device according to this embodiment of the present invention, the first well region and the second well region 102w of each subpixel SP may contain P-type impurities. The first drain region, the first source region, the second drain region 102d, and the second source region 102s of each subpixel SP may contain N-type impurities. Therefore, the display device according to this embodiment of the present invention can improve the flexibility in the configuration of each driving circuit DC and the type of each thin film transistor TR1 and TR2.

[0086] In the display device according to an embodiment of the present invention, the device substrate 100 is described as being a wafer formed of a semiconductor material such as silicon. However, in display devices according to other embodiments of the present invention, the device substrate 100 may include glass or plastic. In the display device according to another embodiment of the present invention, the driving circuit DC of each sub-pixel SP may be formed on the upper surface of the device substrate 100. For example, in the display device according to another embodiment of the present invention, a buffer layer including an inorganic insulating material such as silicon oxide (SiOx) or silicon nitride (SiNx) is formed on the upper surface of the device substrate 100, and the first thin film transistor TR1 and the second thin film transistor TR2 of each sub-pixel SP may include semiconductor patterns formed on the buffer layer. The semiconductor patterns may include a semiconductor material. For example, the first semiconductor pattern of the first thin film transistor TR1 and the second semiconductor pattern of the second thin film transistor TR2 located in each sub-pixel SP may include an oxide semiconductor such as IGZO. Therefore, the display device according to another embodiment of the present invention may have greater flexibility in the material of the device substrate 100 and the configuration of each driving circuit DC.

[0087] In the display device according to this embodiment of the present invention, the lens planarization layer 800 has been described as having a single layer structure. However, in display devices according to other embodiments of the present invention, the lens planarization layer 800 may have a multi-layer structure. For example, as shown in FIG. 5 , in a display device according to another embodiment of the present invention, the lens planarization layer 800 may include a first planarization layer 810 positioned on the barrier pattern 600 and a second planarization layer 820 positioned on the first planarization layer 810. The convex surface of each upper lens 700 may be in direct contact with the second planarization layer 820. For example, the second planarization layer 820 may have a smaller refractive index than each upper lens 700.

[0088] The first planarization layer 810 may include a different material from the second planarization layer 820. For example, the refractive index of the first planarization layer 810 may be between the refractive index of each barrier pattern 600 and the refractive index of the second planarization layer 820. Therefore, the display device according to another embodiment of the present invention may prevent light loss due to the refractive index difference between each barrier pattern 600 and the second planarization layer 820. Therefore, the display device according to another embodiment of the present invention may prevent a decrease in light extraction efficiency and color mixing, and may widen the viewing angle of light emitted from the light emitting element 300 of each sub-pixel SP.

[0089] In the display device according to the embodiment of the present invention, the barrier pattern 600 of each subpixel SP is described as including a color material. However, as shown in FIG. 6 , in a display device according to another embodiment of the present invention, the barrier pattern 600 of each subpixel SP may be made of a transparent material, and the lower lens 500 of each subpixel SP may include a color material that exhibits the same color as the upper lens 700 of the subpixel SP. For example, in the display device according to the embodiment of the present invention, the lower lens 500 of each subpixel SP may be formed of the same material as the upper lens 700 of the subpixel SP. Therefore, in the display device according to the embodiment of the present invention, light passing through the lower lens 500 of each subpixel SP can exhibit a specific color. That is, in the display device according to the embodiment of the present invention, light passing through the lower lens 500 of each subpixel SP can be blocked by the upper lens 700 of an adjacent subpixel SP. Therefore, the display device according to the embodiment of the present invention can expand the viewing angle of light passing through the lower lens 500 of each subpixel SP and prevent color mixing.

[0090] In the display device according to an embodiment of the present invention, the convex surface of the lower lens 500 located over each subpixel SP is described as being completely covered by the barrier pattern 600 of the subpixel SP. However, in a display device according to another embodiment of the present invention, the thickness of the barrier pattern 600 located over each subpixel SP may be smaller than the maximum thickness of the lower lens 500 located over the subpixel SP. For example, as shown in FIGS. 7 and 8, in a display device according to another embodiment of the present invention, the convex surface 500s of the lower lens 500 located over each subpixel SP may include a first region 501s in contact with the barrier pattern 600 of the subpixel SP and a second region 502s in contact with the lens planarization layer 800. The lens planarization layer 800 may have a smaller refractive index than each lower lens 500. The second region 502s of the lower lens 500 located over each subpixel SP may be located near the center of the light-emitting regions R-EA, B-EA, and G-EA defined within the subpixel SP. For example, the first region 501s of the lower lens 500 located on each sub-pixel SP may overlap the non-emitting region NEA. That is, in the display device according to another embodiment of the present invention, the barrier pattern 600 of each sub-pixel SP may be located outside the emitting regions R-EA, B-EA, and G-EA defined within the sub-pixel SP. Therefore, the display device according to another embodiment of the present invention can prevent color mixing and improve the brightness of light emitted from each sub-pixel SP.

[0091] In a display device according to another embodiment of the present invention, the barrier pattern 600 of at least one of the sub-pixels SP may include a color material exhibiting a different color from the upper lens 700 of the sub-pixel SP and the upper lens 700 of an adjacent sub-pixel SP. For example, in a display device according to another embodiment of the present invention, the blue light-emitting region B-EA of each pixel region PA is located between the red light-emitting region R-EA and the green light-emitting region G-EA of the pixel region PA, and the barrier pattern 600 located over the red light-emitting region R-EA of each pixel region PA includes a dye or pigment exhibiting green, the barrier pattern 600 located over the green light-emitting region G-EA of each pixel region PA includes a dye or pigment exhibiting red, and the barrier pattern 600 located over the blue light-emitting region B-EA of each pixel region PA includes a dye or pigment exhibiting blue. Therefore, the display device according to this embodiment of the present invention can effectively prevent a decrease in light extraction efficiency and color mixing. Furthermore, the display device according to this embodiment of the present invention can improve the flexibility of the shape and material of the barrier pattern 600.

[0092] In the display device according to the embodiment of the present invention, the barrier pattern 600 and the upper lens 700 of each subpixel SP are described as including a color material. However, in a display device according to another embodiment of the present invention, the upper lens 700 of each subpixel SP may be made of a transparent material. For example, as shown in FIG. 9 , in a display device according to another embodiment of the present invention, the lower lens 500 of each subpixel SP includes a color material that exhibits the same color as the subpixel SP, the thickness of the barrier pattern 600 located on each subpixel SP is smaller than the maximum thickness of the lower lens 500 located on the subpixel SP, and the barrier pattern 600 of each subpixel SP includes a color material that exhibits a different color from the lower lens 500 of the subpixel SP. Therefore, the display device according to the other embodiment of the present invention can prevent color mixing by the lower lens 500 and the barrier pattern 600 of each subpixel SP, and can widen the viewing angle of light emitted from the light emitting device 300 of the subpixel SP by the upper lens 700 of the subpixel SP. Therefore, the display device according to another embodiment of the present invention can minimize a reduction in the viewing angle of light emitted from the light emitting device 300 of each sub-pixel SP and effectively prevent color mixing.

[0093] In a display device according to another embodiment of the present invention, the lower lens 500, the barrier pattern 600, and the upper lens 700 of each sub-pixel SP may include a color material. For example, as shown in FIG. 10 , in a display device according to another embodiment of the present invention, the lower lens 500 of each sub-pixel SP may include a color material that exhibits the same color as the upper lens 700 of the sub-pixel SP, the barrier pattern 600 of each sub-pixel SP may include a color material that exhibits a different color from the lower lens 500 of the sub-pixel SP, and the thickness of the barrier pattern 600 located over each sub-pixel SP may be smaller than the maximum thickness of the lower lens 500 located over the sub-pixel SP. Therefore, the display device according to another embodiment of the present invention may improve the color of light emitted from the light emitting device 300 of each sub-pixel SP and effectively prevent color mixing.

[0094] In the display device according to an embodiment of the present invention, the barrier pattern 600 of each subpixel SP is described as including a different color material from the barrier pattern 600 of an adjacent subpixel SP. However, in a display device according to another embodiment of the present invention, the barrier pattern 600 of each subpixel SP may include the same color material as the barrier pattern 600 of the adjacent subpixel SP. For example, as shown in FIG. 11 , in a display device according to another embodiment of the present invention, the barrier pattern 600 of each subpixel SP may include a color material that exhibits black, and the thickness of the barrier pattern 600 located over each subpixel SP may be smaller than the maximum thickness of the lower lens 500 located over the subpixel SP. The lower lens 500 of each subpixel SP includes an area in contact with the lens planarizing layer 800, and the lens planarizing layer 800 may have a smaller refractive index than each lower lens 500. The color material that exhibits black may include carbon black. That is, in the display device according to another embodiment of the present invention, the barrier pattern 600 may function as a black matrix. Therefore, the display device according to the embodiment of the present invention can improve the flexibility of the material of the barrier pattern 600 for preventing color mixing.

[0095] 12, in the display device according to another embodiment of the present invention, the barrier pattern 600 of each sub-pixel SP includes a color material that exhibits black, the thickness of the barrier pattern 600 located on each sub-pixel SP is smaller than the maximum thickness of the lower lens 500 located on the corresponding sub-pixel SP, and the lower lens 500 of each sub-pixel SP includes a color material that exhibits the same color as the upper lens 700 of the corresponding sub-pixel SP. That is, in the display device according to another embodiment of the present invention, the lower lens 500 of each sub-pixel SP functions as a primary color filter, the barrier pattern 600 of each sub-pixel SP functions as a black matrix, and the upper lens 700 of each sub-pixel SP functions as a secondary color filter. Therefore, the display device according to another embodiment of the present invention can improve the color of light emitted from the light emitting device 300 of each sub-pixel SP and effectively prevent color mixing.

[0096] In the display device according to the embodiment of the present invention, the barrier pattern 600 of each subpixel SP has a single-layer structure. However, in a display device according to another embodiment of the present invention, the barrier pattern 600 of each subpixel SP may have a multi-layer structure. For example, as shown in FIG. 13 , in a display device according to another embodiment of the present invention, the barrier pattern 600 of each subpixel SP may include a first pattern layer 610 including a color material exhibiting black and a second pattern layer 620 positioned on the first pattern layer 610. The second pattern layer 620 may include a color material exhibiting a different color from that of the first pattern layer 610. For example, the second pattern layer 620 of each subpixel SP may include a color material exhibiting the same color as the upper lens 700 of the corresponding subpixel SP. The convex surface of the lower lens 500 positioned above each subpixel SP may include a region in contact with the first pattern layer 610 and a region in contact with the second pattern layer 620. For example, the first pattern layer 610 of each subpixel SP may contact the edge of the lower lens 500 located above the subpixel SP, and the second pattern layer 620 of each subpixel SP may contact the center of the lower lens 500 located above the subpixel SP. Therefore, the display device according to another embodiment of the present invention can minimize a reduction in the viewing angle of light emitted from the light emitting element 300 of each subpixel SP and effectively prevent color mixing.

[0097] In the display device according to an embodiment of the present invention, the lens planarization layer 800 does not contain a color material. However, in a display device according to another embodiment of the present invention, a portion of the lens planarization layer 800 overlapping each subpixel SP may contain a color material corresponding to the color implemented by the subpixel SP. For example, as shown in FIG. 14 , in a display device according to another embodiment of the present invention, the edge of the lower lens 500 located over each subpixel SP is surrounded by the barrier pattern 600 of the subpixel SP, the lens planarization layer 800 includes a first planarization layer 810 in direct contact with the center of the lower lens 500 located over each subpixel SP, and a second planarization layer 820 located on the first planarization layer 810. A portion of the first planarization layer 810 overlapping each subpixel SP may contain a color material that exhibits the same color as the subpixel SP. Therefore, the display device according to another embodiment of the present invention can prevent color mixing by the portion of the first planarization layer 810 located over each subpixel SP and the upper lens 700. Therefore, in the display device according to another embodiment of the present invention, the degree of freedom in the configuration of the barrier pattern 600 and the lens planarization layer 800 can be improved.

[0098] In the display device according to the embodiment of the present invention, the upper lens 700 of each subpixel SP has the same maximum size as the lower lens 500 of that subpixel SP. However, in the display device according to another embodiment of the present invention, the convex surface 700s of the upper lens 700 located over each subpixel SP may have a different curvature than the convex surface 500s of the lower lens 500 located over that subpixel SP. For example, as shown in FIG. 15 , in the display device according to the other embodiment of the present invention, the maximum size of the lower lens 500 located over each subpixel SP may be smaller than the maximum size of the upper lens 700 located over that subpixel SP. The convex surface of the upper lens 700 located over each subpixel SP may have a larger curvature than the convex surface of the lower lens 500 located over that subpixel SP. Therefore, in the display device according to another embodiment of the present invention, light emitted through an edge of the lower lens 500 located on each sub-pixel SP can be refracted toward the upper lens 700 of the sub-pixel SP due to a refractive index difference between the lower lens 500 of the sub-pixel SP and the barrier pattern 600. That is, in the display device according to another embodiment of the present invention, the amount of light traveling toward the upper lens 700 of each sub-pixel SP can be increased. Therefore, in the display device according to another embodiment of the present invention, the brightness of light emitted from each sub-pixel SP can be improved and color mixing can be prevented. [Explanation of symbols]

[0099] 100 Element substrate 300 light-emitting elements 400 Sealed structures 500 lower lens 600 Barrier Pattern 700 upper lens 800 Lens flattening film

Claims

1. a light-emitting element located on a light-emitting region of an element substrate; a lower lens positioned above the light-emitting element and overlapping the light-emitting region; a barrier pattern located on the light-emitting element and surrounding an edge of the lower lens; an upper lens positioned on the lower lens and the barrier pattern and overlapping the light-emitting area, a surface of the lower lens facing the upper lens and a surface of the upper lens facing the lower lens have a convex cross section; A display device, wherein one of the lower lens and the barrier pattern includes a color material that exhibits the same color as the upper lens.

2. 10. The display device of claim 1, wherein the color material comprises a dye or pigment exhibiting one of red, green, and blue colors.

3. The display device according to claim 1 , wherein the refractive index of the barrier pattern is smaller than the refractive index of the lower lens.

4. the thickness of the barrier pattern is greater than the maximum thickness of the lower lens; The display device of claim 3 , wherein a surface of the lower lens facing the upper lens is in contact with the barrier pattern.

5. further comprising a lens planarization film in contact with a surface of the upper lens facing the lower lens; 10. The display device of claim 1, wherein the refractive index of the lens planarization film is smaller than the refractive index of the upper lens.

6. 6. The display device of claim 5, wherein a surface of the lens planarization film facing the element substrate is in contact with a surface of the barrier pattern opposite the element substrate.

7. The display device of claim 1 , wherein the lower lens and the upper lens each have a size larger than the light-emitting area.

8. The display device of claim 7 , wherein the size of the upper lens is different from the size of the lower lens.

9. a light-emitting element located on a light-emitting region of an element substrate; a lower lens positioned on the light-emitting element and having a first curved surface opposite the element substrate; a barrier pattern surrounding at least a portion of the first curved surface and including a first color material; an upper lens positioned on the lower lens and the barrier pattern, the upper lens having a second curved surface facing the first curved surface; the first curved surface and the second curved surface overlapping the light-emitting region have shapes that bulge toward each other, At least one of the lower lens and the upper lens includes a second color material that exhibits a color different from the first color material.

10. The display device of claim 9 , wherein the barrier pattern is located outside the light-emitting area.

11. The lens further includes a lens planarization film positioned between the lower lens and the upper lens and having a refractive index smaller than that of the lower lens; the first curved surface of the lower lens includes a first region in contact with the barrier pattern and a second region in contact with the lens planarization film; The display device of claim 9 , wherein the second region is located closer to a center of the light-emitting region than the first region.

12. 12. The display device of claim 11, wherein the first color material comprises a dye or pigment that exhibits black color.

13. The display device of claim 9 , wherein an upper surface of the upper lens opposite the device substrate is parallel to a lower surface of the lower lens facing the device substrate.

14. the lens planarization layer includes a first planarization layer and a second planarization layer located on the first planarization layer; The display device of claim 11, wherein the first planarization film includes a third color material that exhibits the same color as the second color material.

15. The display device of claim 9 , wherein the second curved surface of the upper lens has a different curvature than the first curved surface of the lower lens.

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