Display device with color filter

Abstract

A display device including a color filter is provided. The display device includes light emitting devices on a light emitting region of a device substrate, a color filter on the light emitting devices, the color filter overlapping the light emitting region, and a color filter planarization layer on the color filter, the color filter planarization layer extending beyond each light emitting region, wherein the color filter includes a first color filter and a second color filter, the second color filter including a different material than the first color filter, wherein the second color filter includes a central region and a first edge region disposed between the central region and the first color filter, and wherein a thickness of the second color filter gradually changes from the first edge region toward the central region. Accordingly, in the display device, a luminance deviation according to a direction in which a viewer watches an image at the same viewing angle can be improved, and an overall luminance can be increased.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2024-0175298, filed on November 29, 2024, which is incorporated herein by reference as if fully set forth herein. Technical Field

[0003] This disclosure relates to a display device in which a color filter is disposed on a light-emitting device. Background Technology

[0004] Typically, a display device provides images to a user. For example, a display device may include light-emitting devices. Each light-emitting device may display a specific color. For example, each light-emitting device may include a light-emitting unit disposed between a lower electrode and an upper electrode.

[0005] The image can include a variety of colors. Light emitted from each light-emitting device can display the same color as light emitted from an adjacent light-emitting device. For example, color filters can be placed on the light-emitting devices. Each color filter can overlap with a light-emitting device. For example, light generated through each light-emitting device can be emitted via a color filter. Summary of the Invention

[0006] Therefore, this disclosure relates to a display device that substantially eliminates one or more problems caused by the limitations and disadvantages of related technologies.

[0007] One object of this disclosure is to provide a display device capable of preventing brightness deviations based on the viewer's position at the same viewing angle.

[0008] Another objective of this disclosure is to provide a display device that can increase overall brightness.

[0009] Further advantages, objects, and features of this disclosure will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon viewing the following, or may be learned from practice of the disclosure. The objects and other advantages of the invention may be realized and obtained by means of the structures specifically pointed out in the written description and its claims, as well as the accompanying drawings.

[0010] To achieve these objectives and other advantages, and for the purposes of this disclosure, as specifically implemented and broadly described herein, a display device comprising a device substrate is provided. A light-emitting device is disposed on a light-emitting region of the device substrate. A color filter is disposed on the light-emitting device. The color filter overlaps with the light-emitting region. A color filter planarization layer is disposed on the color filter. The color filter planarization layer extends beyond each light-emitting region. The color filter includes a first color filter and a second color filter. The second color filter is made of a different material than the first color filter. The second color filter includes a central region and a first edge region. The first edge region is disposed between the central region and the first color filter. The thickness of the second color filter gradually changes from the first edge region toward the central region.

[0011] The thickness of the central region may be less than the thickness of the first edge region. The thickness of the first color filter is the same as the thickness of the first edge region.

[0012] The upper surface of the second color filter, opposite the device substrate, may include a curved region connecting the central region and the first edge region. The curved region may have a concave shape toward the boundary between the first and second color filters.

[0013] The curved region of the second color filter may contact the color filter planarization layer. The color filter planarization layer may have a larger refractive index than the second color filter.

[0014] The third color filter may be made of a different material than the first and second color filters. The second color filter may be disposed between the first and third color filters. The second color filter may include a second edge region. The second edge region may be disposed between the central region and the third color filter. The thickness of the second color filter may gradually change from the second edge region toward the central region.

[0015] The second edge region may have a shape that is symmetrical with respect to the central region and the first edge region.

[0016] The first color filter may be a color filter containing blue pigment. The second color filter may be a color filter containing red pigment. The third color filter may be a color filter containing green pigment.

[0017] The first edge region may include a portion that overlaps with the first color filter. The second edge region may include a portion that overlaps with the third color filter.

[0018] Each of the first, second, and third color filters may include a lower surface facing the device substrate. The lower surface of the second color filter may be disposed on the same layer as the lower surfaces of the first and third color filters. The thickness of the third color filter may be the same as the thickness of the first color filter.

[0019] The thickness of the second edge region may be different from the thickness of the first edge region.

[0020] The thickness of each of the first and third color filters may be greater than or equal to 2.0 μm.

[0021] An intermediate insulating layer may be provided between the upper surface of the second color filter and the color filter planarization layer, and the intermediate insulating layer may have a larger refractive index than the second color filter.

[0022] The upper surface of the intermediate insulating layer facing the color filter planarization layer can be continuous with the upper surface of the first color filter.

[0023] The upper surface of the second color filter opposite to the device substrate may include a curved region connecting the central region and the first edge region. The curved region may have a convex shape toward the boundary between the first color filter and the second color filter, and the color filter planarization layer in contact with the curved region may have a smaller refractive index than the second color filter.

[0024] The upper surface of the second color filter may include a first curved surface positioned near the first color filter and a second curved surface positioned near the third color filter, and the curvature of the second curved surface may be different from the curvature of the first curved surface.

[0025] The display device may further include a focusing lens between the light-emitting device and the second color filter, and the surface of the focusing lens facing the planarization layer of the color filter may have a convex shape.

[0026] The second color filter may have a smaller refractive index than the condenser lens.

[0027] The second color filter may include a lower surface having a convex shape that contacts the condenser lens; and an upper surface having a concave shape that contacts the color filter planarization layer.

[0028] In another embodiment, a display device including a device substrate is provided. The device substrate includes a first light-emitting region and a second light-emitting region. The second light-emitting region realizes a different color from the first light-emitting region. A first light-emitting device is disposed on the first light-emitting region of the device substrate. The first light-emitting device has a stacked structure of a first lower electrode, a first light-emitting unit, and a first upper electrode. A second light-emitting device is disposed on the second light-emitting region of the device substrate. The second light-emitting device has a stacked structure of a second lower electrode, a second light-emitting unit, and a second upper electrode. Light generated by the second light-emitting unit displays the same color as light generated by the first light-emitting unit. A first color filter is disposed on the first light-emitting device. The first color filter overlaps with the first light-emitting region. A second color filter is disposed on the second light-emitting device. The second color filter overlaps with the second light-emitting region. A color filter planarization layer is disposed on the first color filter and the second color filter. Each of the first color filter and the second color filter includes a lower surface facing the device substrate and an upper surface facing the color filter planarization layer. At least one of the lower surface and the upper surface of the second color filter has a concave shape facing the center of the second color filter.

[0029] The upper surface of the first color filter may have a shape parallel to the lower surface of the first color filter.

[0030] A condensing lens can be disposed between the second light-emitting device and the second color filter. The condensing lens may overlap with the second light-emitting area. The end of the condensing lens may be disposed outside the first light-emitting area. The surface of the condensing lens facing the planarization layer of the color filter may have a convex shape.

[0031] The lower surface of the second color filter can contact the surface of the condenser lens facing the planarization layer of the color filter.

[0032] The second color filter may have a smaller refractive index than the condenser lens.

[0033] The upper surface of the second color filter may be continuous with the upper surface of the first color filter.

[0034] An encapsulation structure may be disposed between the first light-emitting device and the first color filter. The encapsulation structure may extend between the second light-emitting device and the second color filter. The lower surface of the condensing lens facing the device substrate and the lower surface of the first color filter may contact the upper surface of the encapsulation structure facing the planarization layer of the color filter. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of this disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and, together with the specification, serve to explain the principles of the disclosure. In the drawings:

[0036] Figure 1 This is a schematic diagram illustrating a display device according to an embodiment of the present disclosure;

[0037] Figure 2 yes Figure 1 Enlarged view of region K1 in the image;

[0038] Figure 3 This is a diagram illustrating the circuitry of a pixel region in a display device according to an embodiment of the present disclosure;

[0039] Figure 4 It is along Figure 2 A diagram showing the section cut off by the I-I' line;

[0040] Figure 5 yes Figure 4 Enlarged view of region K2 in the image;

[0041] Figures 6 to 8 It is a graph showing the brightness of color filters with different thicknesses according to the viewing angle; and

[0042] Figures 9 to 13 This is a diagram illustrating a display device according to another embodiment of the present disclosure. Detailed Implementation

[0043] In the following detailed description, the above-mentioned objectives, technical configurations, and operational effects related to the embodiments of this disclosure will be more clearly understood through the accompanying drawings illustrating some embodiments of this disclosure. Here, the embodiments of this disclosure are provided to satisfactorily convey the technical spirit of this disclosure to those skilled in the art; therefore, this disclosure may be implemented in other forms and is not limited to the embodiments described below.

[0044] Furthermore, identical or very similar elements may be represented by the same reference numerals throughout the application, and in the drawings, for convenience, the length and thickness of layers and regions may be exaggerated. It will be understood that when a first element is referred to as being "on" a second element, although the first element may be disposed on the second element to contact the second element, a third element may be inserted between the first element and the second element.

[0045] Here, for example, terms such as "first" and "second" may be used to distinguish any one element from other elements. However, without departing from the technical spirit of this disclosure, the first and second components may be named arbitrarily according to the convenience of those skilled in the art.

[0046] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. For example, unless the context clearly indicates otherwise, elements described in the singular are intended to include multiple elements. Furthermore, it will be further understood in this disclosure that the terms “comprising” and “including” specify the presence of the described features, integers, steps, operations, elements, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0047] In addition, unless “direct” is used, the terms “connection” and “combination” can include two components being “connected” or “combined” through one or more other components located between the two components.

[0048] Furthermore, unless otherwise defined, all terms used herein (including technical or scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the example embodiments pertain. It should be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and should not be interpreted as having an idealized or overly formal meaning unless expressly defined herein.

[0049] (Implementation Method)

[0050] Figure 1 This is a schematic diagram illustrating a display device according to an embodiment of the present disclosure. Figure 2 yes Figure 1 A magnified view of region K1 in the image. Figure 3 This is a diagram illustrating the circuitry of a pixel region in a display device according to an embodiment of the present disclosure. Figure 4 It is along Figure 2 The diagram is a cut-off line from line I-I'. Figure 5 yes Figure 4 A magnified view of the K2 region.

[0051] Reference Figures 1 to 5A display device according to embodiments of the present disclosure may include a display panel DP. The display panel DP can generate an image provided to a user. For example, a pixel region PA may be provided within the display panel DP. Various signals may be applied to each pixel region PA via signal wirings GL, DL, and PL. The signal wirings GL, DL, and PL may include a gate line GL for applying gate signals, a data line DL for applying data signals, and a power supply line PL for supplying power supply voltage.

[0052] The display panel DP may include an effective area AA with a pixel area PA and a bezel area BZ disposed outside the effective area AA. Each of the signal lines GL, DL, and PL can be electrically connected to the pixel area PA through the bezel area BZ. For example, the effective area AA may be surrounded by the bezel area BZ. A gate driver GD electrically connected to the gate line GL, a data driver DD electrically connected to the data line DL, a power supply unit PU electrically connected to the power supply voltage line PL, and a timing controller TC controlling the gate driver GD and the data driver DD may be disposed outside the effective area AA. At least one of the gate driver GD, the data driver DD, the power supply unit PU, and the timing controller TC may be disposed on the bezel area BZ. For example, the display device according to an embodiment of the present disclosure may be a GIP (Gate In-Panel) type display device in which the gate driver GD is formed in the bezel area BZ.

[0053] Each pixel region PA can achieve a specific color. For example, each pixel region PA can be provided with a drive circuit DC electrically connected to signal wirings GL, DL, and PL, and a light-emitting device 300 electrically connected to the drive circuit DC. The drive circuit DC and the light-emitting device 300 of each pixel region PA can be supported by a device substrate 100. The device substrate 100 can include various materials. For example, the device substrate 100 can be a wafer made of a semiconductor material such as silicon.

[0054] The driving circuit DC can use the power supply voltage to supply a driving current corresponding to the data signal based on the gate signal to the light-emitting device 300. The driving current supplied to the light-emitting device 300 by the driving circuit DC can be maintained for one frame. For example, the driving circuit DC may include a first thin-film transistor TR1, a second thin-film transistor TR2, and a storage capacitor Cst.

[0055] The first thin-film transistor TR1 can transmit a data signal to the second thin-film transistor TR2 according to the gate signal. For example, the first thin-film transistor TR1 can be used as a switching thin-film transistor. The first thin-film transistor TR1 may 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 may be electrically connected to the gate line GL, and the first drain electrode may be electrically connected to the data line DL.

[0056] The second thin-film transistor TR2 can generate a drive current corresponding to the data signal using the power supply voltage. For example, the second thin-film transistor TR2 can be used as a driving thin-film transistor. The second thin-film transistor TR2 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 may be electrically connected to the first source electrode, and the second drain electrode 225 may be electrically connected to the power supply voltage line PL.

[0057] A second well region 102w, a second drain region 102d, and a second source region 102s may be formed in a device substrate 100. Each of the second well region 102w, the second drain region 102d, and the second source region 102s may include a conductive impurity. For example, the process of forming the second well region 102w, the second drain region 102d, and the second source region 102s may include a process of doping a portion of the device substrate 100 with a conductive impurity. The second drain region 102d and the second source region 102s may include conductive impurities having a different type of conductivity than the second well region 102w. For example, the second well region 102w may include an n-type impurity, and the second drain region 102d and the second source region 102s may include a p-type impurity. The second drain region 102d and the second source region 102s may be disposed within the second well region 102w.

[0058] The second well region 102w may include conductive impurities of a different type than those in the first well region. The second drain region 102d and the second source region 102s may include conductive impurities of a different type than those in the first drain and first source regions. For example, the second well region 102w may include conductive impurities of the same type as those in the first drain and first source regions, and the second drain region 102d and the second source region 102s may include conductive impurities of the same type as those in the first well region. Therefore, in a display device according to an embodiment of this disclosure, the second thin-film transistor TR2 may have characteristics different from those of the first thin-film transistor TR1. The second well region 102w may be formed simultaneously with the first drain and first source regions, and the second drain region 102d and the second source region 102s may be formed simultaneously with the first well region. Therefore, in a display device according to an embodiment of this disclosure, process efficiency can be improved.

[0059] A second gate electrode 223 may be disposed on the device substrate 100. For example, the second gate electrode 223 may overlap with a portion of the second well region 102. The second gate electrode 223 may include a conductive material. For example, the second gate electrode 223 may include metals such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The portion of the second well region 102w that overlaps with the second gate electrode 223 may be disposed between the second drain region 102d and the second source region 102s. 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, the portion of the second well region 102w between the second drain region 102d and the second source region 102s that overlaps with the second gate electrode 223 may have conductivity corresponding to the voltage of a signal applied to the second gate electrode 223. For example, in a display device according to an embodiment of the present disclosure, the portion of the second well region 102w between the second drain region 102d and the second source region 102s that overlaps with the second gate electrode 223 can be used as the channel region of the second thin film transistor TR2.

[0060] The second gate electrode 223 may comprise the same material as the first gate electrode. The second gate electrode 223 may be disposed in the same layer as the first gate electrode. The second gate electrode 223 may be formed using the same process as the first gate electrode. For example, the second gate electrode 223 may be formed simultaneously with the first gate electrode.

[0061] A second drain electrode 225 may be disposed 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 metals such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The second drain electrode 225 may be spaced apart from the device substrate 100. The second drain electrode 225 may be insulated from the second gate electrode 223. For example, the second drain electrode 225 may be disposed on a different layer than the second gate electrode 223. The second drain electrode 225 may include a different material than the second gate electrode 223.

[0062] The second drain electrode 225 may comprise the same material as the first drain electrode. The second drain electrode 225 may be disposed in the same layer as the first drain electrode. The second drain electrode 225 may be formed using the same process as the first drain electrode. For example, the second drain electrode 225 may be formed simultaneously with the first drain electrode.

[0063] A second source electrode 227 may be disposed 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 metals such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W). The second source electrode 227 may be spaced apart from the device substrate 100. The second source electrode 227 may be insulated from the second gate electrode 223. For example, the second source electrode 227 may be disposed on a different layer than the second gate electrode 223. The second source electrode 227 may include a different material than the second gate electrode 223.

[0064] The second source electrode 227 may be disposed on the same layer as the second drain electrode 225. The second source electrode 227 may comprise the same material as the second drain electrode 225. The second source electrode 227 may be formed using 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. The second source electrode 227 may be spaced apart from the second drain electrode 225.

[0065] The second source electrode 227 may comprise the same material as the first source electrode. The second source electrode 227 may be disposed in the same layer as the first source electrode. The second source electrode 227 may be formed using the same process as the first source electrode. For example, the second source electrode 227 may be formed simultaneously with the first source electrode.

[0066] The storage capacitor Cst can maintain the voltage of the signal applied to the second gate electrode 223 for one frame. The storage capacitor Cst may have a stacked structure of capacitor electrodes. For example, the storage capacitor Cst may have a stacked structure of a first capacitor electrode electrically connected to the second gate electrode 223 and a second capacitor electrode electrically connected to the second source electrode 227. The storage capacitor Cst can be formed by a process that forms the first thin-film transistor TR1 and the second thin-film transistor TR2. For example, the first capacitor electrode may be formed simultaneously with the second gate electrode 223, and the second capacitor electrode may be formed simultaneously with the second source electrode 227. Therefore, in the display device according to an embodiment of the present disclosure, process efficiency can be improved.

[0067] At least one insulating layer 110, 120, 130 and 140 for preventing unwanted electrical connections may be provided 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 provided on the device substrate 100.

[0068] The gate insulating layer 110 may be positioned close to the device substrate 100. The second gate electrode 223 of each pixel region PA may be insulated from the device substrate 100 via the gate insulating layer 120. For example, the first and second gate electrodes 223 of each pixel region PA may be disposed on the gate insulating layer 120, which completely covers the upper surface of the device substrate 100. The gate insulating layer 110 may include an insulating material. For example, the gate insulating layer 110 may be an inorganic insulating layer made of an inorganic insulating material such as silicon oxide (SiOx) or silicon nitride (SiNx). The second gate electrode 223 of each pixel region PA may have the same horizontal position as the first gate electrode of each pixel region PA. For example, the distance between the device substrate 100 and the second gate electrode 223 of each pixel region PA may be the same as the distance between the device substrate 100 and the first gate electrode of each pixel region PA. The gate insulating layer 110 may be a linear insulating layer with a constant thickness.

[0069] An interlayer insulating layer 120 may be disposed on the gate insulating layer 110. The second drain electrode 225 and the second source electrode 227 of each pixel region PA may be insulated from the second gate electrode 223 of the corresponding pixel region PA through the interlayer insulating layer 120. For example, the interlayer insulating layer 120 may cover the first gate electrode and the second gate electrode 223 of each pixel region PA. The first drain electrode, the first source electrode, the second drain electrode 225, and the second source electrode 227 of each pixel region PA may be disposed on the interlayer insulating layer 120. The interlayer insulating layer 120 may include an insulating material. For example, the interlayer insulating layer 120 may be an inorganic insulating layer made of an inorganic insulating material.

[0070] A device planarization layer 130 may be disposed on the interlayer insulating layer 120. The device planarization layer 130 can eliminate thickness differences caused by the driving circuit DC of each pixel region PA. For example, the first drain electrode, the first source electrode, the second drain electrode 225, and the second source electrode 227 in each pixel region PA may be covered by the device planarization layer 130. The upper surface of the device planarization layer 130 opposite to the device substrate 100 may be flat. For example, the upper surface of the device planarization layer 130 may be parallel to the upper surface of the device substrate 100. The device planarization layer 130 may include an insulating material. The device planarization layer 130 may include a material with high fluidity. For example, the device planarization layer 130 may be an organic insulating layer made of an organic insulating material.

[0071] A light-emitting device 300 for each pixel region PA can be disposed on the device planarization layer 130. The light-emitting device 300 for each pixel region PA is capable of emitting light displaying a specific color. For example, the light-emitting device 300 for each pixel region PA may include a lower electrode 310, a light-emitting unit 320, and an upper electrode 330 sequentially stacked on the device planarization layer 130.

[0072] The lower electrode 310 and the upper electrode 330 may comprise conductive materials. The upper electrode 330 may comprise a different material than the lower electrode 310. For example, the lower electrode 310 may be a transparent electrode made of a transparent conductive material such as ITO and IZO, and the upper electrode may be a semi-transparent electrode formed with a thin layer of a metal such as silver (Ag) and magnesium (Mg). The upper electrode 330 may have a different work function than the lower electrode 310. For example, the work function of the upper electrode 330 may be smaller than that of the lower electrode 310. Therefore, in a display device according to an embodiment of the present disclosure, the lower electrode 310 may be used as an anode, and the upper electrode 330 may be used as a cathode.

[0073] The light-emitting unit 320 can generate light with a brightness corresponding to the voltage difference between the lower electrode 310 and the upper electrode 330. For example, the light-emitting unit 320 may include a light-emitting material layer (EML). The light-emitting material layer may include organic light-emitting materials, inorganic light-emitting materials, or mixed light-emitting materials. For example, a display device according to an embodiment of this disclosure may be an organic light-emitting display device including organic light-emitting materials.

[0074] The light-emitting unit 320 may have a multilayer structure. For example, the light-emitting unit 320 may further include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). Therefore, in the display device according to the embodiments of the present disclosure, the efficiency of the light-emitting unit 320 can be improved.

[0075] A fence 140 may be provided on the device planarization layer 130. The fence 140 may include an insulating material. Each fence 140 may have a constant thickness. For example, the fence 140 may be an inorganic insulating layer made of an inorganic insulating material. The fence 140 may define light-emitting regions R-EA, G-EA, and B-EA in each pixel region PA. The light-emitting regions R-EA, G-EA, and B-EA in each pixel region PA may represent areas that generate light. For example, the light-emitting unit 320 may be in direct contact with the lower electrode 310 and the upper electrode 330 within the light-emitting regions R-EA, G-EA, and B-EA in each pixel region PA.

[0076] The lower electrode 310 of each pixel region PA can be spaced apart from the lower electrode 301 of the adjacent pixel region PA. The lower electrode 310 of each pixel region PA can be insulated from the lower electrode 310 of the adjacent pixel region PA by a fence 140. For example, the edge of the lower electrode 310 in each pixel region PA can be covered by the fence 140. A portion of the lower electrode 310 that overlaps with the light-emitting regions R-EA, G-EA, and B-EA of each pixel region PA can be in direct contact with the upper surface of the device planarization layer 130.

[0077] The driving current generated by the driving circuit DC of each pixel region PA can be applied to the lower electrode 310 of the corresponding pixel region PA. For example, the lower electrode 310 of each pixel region PA can be in direct contact with the second source electrode 227 of the corresponding pixel region PA through the device planarization layer 130. The connection point between the lower electrode 310 and the second source electrode 227 in each pixel region PA can be disposed outside the light-emitting regions R-EA, G-EA, and B-EA defined in the corresponding pixel region PA. For example, the connection point between the lower electrode 310 and the second source electrode 227 in each pixel region PA can overlap with one of the fences 140. Therefore, in the display device according to the embodiment of the present disclosure, deviations in the brightness of light emitted from the light-emitting regions R-EA, G-EA, and B-EA of each pixel region PA due to positional differences can be prevented.

[0078] The light emitted by the light-emitting unit 320 of each pixel region PA can display the same color as the light emitted by the light-emitting unit 320 of the adjacent pixel region PA. For example, the light emitted by the light-emitting unit 320 of each pixel region PA can display white. The light-emitting unit 320 of each pixel region PA can have the same stacking structure as the light-emitting units 320 of the adjacent pixel region PA. The light-emitting unit 320 of each pixel region PA can be formed simultaneously with the light-emitting units 320 of the adjacent pixel region PA.

[0079] The signal applied to the upper electrode 330 of each pixel region PA can be the same as the signal applied to the upper electrode 330 of adjacent pixel regions PA. For example, the upper electrode 330 of each pixel region PA can be electrically connected to the upper electrode 330 of adjacent pixel regions PA. The upper electrode 330 of each pixel region PA can comprise the same material as the upper electrode 330 of adjacent pixel regions PA. The upper electrode 330 of each pixel region PA can be formed using the same process as the upper electrode of adjacent pixel regions PA. For example, the upper electrode 330 of each pixel region PA can be formed simultaneously with the upper electrode 330 of adjacent pixel regions PA. The upper electrode 330 of each pixel region PA can be in direct contact with the upper electrode 330 of adjacent pixel regions PA. Therefore, in the display device according to the embodiments of the present disclosure, the process for forming the upper electrode 330 of each pixel region PA can be simplified.

[0080] The image provided to the user may include various colors of light emitted from the light-emitting regions R-EA, G-EA, and B-EA of the pixel region PA. For example, the light-emitting regions R-EA, G-EA, and B-EA of each pixel region PA may be one of a red light-emitting region R-EA emitting red light, a green light-emitting region G-EA emitting green light, and a blue light-emitting region B-EA emitting blue light. Microcavity structures may be formed in the light-emitting regions R-EA, G-EA, and B-EA of each pixel region PA. For example, reflective electrodes 200R, 200G, and 200B may be provided between the driving circuit DC and the lower electrode 310 of each pixel region PA. Therefore, in the display device according to an embodiment of the present disclosure, some light generated by the light-emitting unit 320 of each pixel region PA having a wavelength range corresponding to the colors realized by the light-emitting regions R-EA, G-EA, and B-EA of the corresponding pixel region PA may be amplified between the reflective electrodes 200R, 200G, and 200B and the upper electrode 330 of the corresponding pixel region PA. For example, in a display device according to an embodiment of this disclosure, red light can be amplified between the red reflective electrode 200R and the upper electrode 330 of the red emitting region R-EA, green light can be amplified between the green reflective electrode 200G and the upper electrode 330 of the green emitting region G-EA, and blue light can be amplified between the blue reflective electrode 200B and the upper electrode 330 of the blue emitting region B-EA. The light amplified between the reflective electrodes 200R, 200G, and 200B of each pixel region PA and the upper electrode 300 can be emitted through the upper electrode 330 of the corresponding pixel region PA.

[0081] The positions of the reflective electrodes 200R, 200G, and 200B in the light-emitting regions R-EA, G-EA, and B-EA of each pixel region PA can vary depending on the color achieved by the corresponding light-emitting regions R-EA, G-EA, and B-EA of the pixel region PA. For example, the green reflective electrode 200G can be disposed on a different layer than the red reflective electrode 200R, and the blue reflective electrode 200B can be disposed on a different layer than the green reflective electrode 200G and the red reflective electrode 200R. The wavelength range of the light amplified between the reflective electrodes 200R, 200G, and 200B of each pixel region PA and the upper electrode 330 can be determined by the distance between the reflective electrodes 200R, 200G, and 200B and the upper electrode 330 of the corresponding pixel region PA. For example, the device planarization layer 130 may include a first planarization layer 131, a second planarization layer 132, a third planarization layer 133, and a fourth planarization layer 134 stacked in sequence. The red reflective electrode 200R in the red light-emitting region R-EA may be disposed between the first planarization layer 131 and the second planarization layer 132. The green reflective electrode 200G in the green light-emitting region G-EA may be disposed between the second planarization layer 132 and the third planarization layer 133. The blue reflective electrode 200B in the blue light-emitting region B-EA may be disposed on the third planarization layer 133.

[0082] The upper surface of the blue reflective electrode 200B, which faces the device substrate 100, can directly contact the lower electrode 310 of the blue light-emitting regions B-EA. For example, the thickness of the blue reflective electrode 200B can be the same as the thickness of the fourth planarization layer 134. The lower electrode 310 of each pixel region PA may include a region that contacts the upper surface of the fourth planarization layer 134 facing the device substrate 100. For example, the side surface of the blue reflective electrode 200B may be surrounded by the fourth planarization layer 134. Therefore, in the display device according to the embodiments of the present disclosure, the overall thickness can be reduced.

[0083] The region between the light-emitting regions R-EA, G-EA, and B-EA can be defined as a non-light-emitting region. For example, a fence 140 can be provided in the non-light-emitting region. A separation trench ST can be provided in the non-light-emitting region provided between the fences 140. The separation trench ST can be formed in the device planarization layer 130. The separation trench ST can be positioned close to the upper surface of the device planarization layer 130. For example, the separation trench ST can have a trench shape in which a portion of the device planarization layer 130 is removed. The separation trench ST can be surrounded by the device planarization layer 130. An air gap can be formed inside the separation trench ST. The light-emitting unit 320 of each pixel region PA can be partially separated from the light-emitting unit 320 of adjacent pixel regions PA by the fences 140 and the separation trench ST. For example, the light-emitting unit 320 of each pixel region PA can include at least one charge generation layer between the light-emitting stack and the light-emitting stack, and the charge generation layer on each pixel region PA can be separated from the charge generation layer of adjacent pixel regions PA by the fences 140 and the separation trench ST. Therefore, in the display device according to the embodiments of the present disclosure, leakage of the driving current applied to the pixel region PA through the charge generation layer can be prevented. Therefore, in the display device according to the embodiments of the present disclosure, malfunctions of the light-emitting device 300 in each pixel region PA due to leakage current can be prevented.

[0084] An encapsulation structure 400 can be provided on the light-emitting device 300 in each pixel region PA. The encapsulation structure 400 can prevent the light-emitting device 300 in each pixel region PA from being damaged by external impact and moisture. The encapsulation structure 400 can have a multi-layer structure. For example, the encapsulation structure 400 can include a first encapsulation layer 410, a second encapsulation layer 420, and a third encapsulation layer 430 sequentially stacked on the upper electrode 330. The first encapsulation layer 410, the second encapsulation layer 420, and the third encapsulation layer 430 can include insulating materials. The second encapsulation layer 420 can include materials different from the first encapsulation layer 410 and the third encapsulation layer 430. For example, the first encapsulation layer 410 and the third encapsulation layer 430 can be inorganic encapsulation layers made of inorganic insulating materials, and the second encapsulation layer 420 can be an organic encapsulation layer made of organic insulating materials. Therefore, in the display device according to the embodiments of the present disclosure, the thickness difference caused by the light-emitting device 300 in each pixel region PA can be eliminated by the second encapsulation layer 420. For example, the upper surface of the third encapsulation layer 430, which is opposite to the device substrate 100, can be flat.

[0085] Color filters 500R, 500G, and 500B can be disposed on the package structure 400. Color filters 500R, 500G, and 500B can overlap with the light-emitting regions R-EA, G-EA, and B-EA of the pixel region PA. For example, light emitted from the light-emitting device 300 of each pixel region PA can pass through one of the color filters 500R, 500G, and 500B. Light passing through the color filters 500R, 500G, and 500B disposed on each pixel region PA can display the same color as light emitted from the corresponding light-emitting regions R-EA, G-EA, and B-EA of the pixel region PA. For example, color filters 500R, 500G, and 500B may include a red color filter 500R overlapping with the red light-emitting region R-EA, a green color filter 500G overlapping with the green light-emitting region G-EA, and a blue color filter 500B overlapping with the blue light-emitting region B-EA. Therefore, color reproduction can be improved in the display device according to the embodiments of the present disclosure. The color filters 500R, 500G, and 500B can be formed from various materials. For example, each of the color filters 500R, 500G, and 500B may include pigment. Therefore, reliability at high temperatures can be improved in the display device according to the present embodiment.

[0086] Color filters 500R, 500G, and 500B can be arranged side-by-side. For example, the lower surface of each color filter 500R, 500G, and 500B facing the device substrate 100 can directly contact the upper surface of the package structure 400. The side surface of each color filter 500R, 500G, and 500B can directly contact the adjacent color filter 500R, 500G, and 500B. For example, the boundary of adjacent color filters 500R, 500G, and 500B can overlap with the separation trench ST. Therefore, in the display device according to the embodiment of this disclosure, image quality degradation perceived by the user due to light not passing through the color filters 500R, 500G, and 500B can be prevented. That is, light leakage can be prevented in the display device according to this embodiment.

[0087] Pixel regions PA can be arranged side-by-side in a first direction X and a second direction Y perpendicular to the first direction X. For example, pixel regions PA can be arranged in a matrix. The light-emitting regions R-EA, G-EA, and B-EA of each pixel region PA can display a different color than the light-emitting regions R-EA, G-EA, and B-EA of the pixel regions PA adjacent to each other in the first direction X. For example, in a display device according to an embodiment of the present disclosure, the red light-emitting region R-EA, the green light-emitting region G-EA, and the blue light-emitting region B-EA can be arranged repeatedly in the first direction X. The light-emitting regions R-EA, G-EA, and B-EA of each pixel region PA can display the same color as the light-emitting regions R-EA, G-EA, and B-EA of the pixel regions PA adjacent to each other in the second direction Y. For example, each of the color filters 500R, 500G, and 500B can extend in the second direction Y. According to embodiments of this disclosure, a display device may be a strip-type display device in which color filters 500R, 500G, and 500B extending in a second direction Y can be arranged side-by-side in a first direction X.

[0088] A color filter planarization layer 600 may be provided on color filters 500R, 500G, and 500B. The color filter planarization layer 600 prevents damage to the color filters 500R, 500G, and 500B due to external impacts. The color filter planarization layer 600 may include an insulating material. For example, the color filter planarization layer 600 may include inorganic and / or organic insulating materials. The thickness difference caused by the color filters 500R, 500G, and 500B can be removed by the color filter planarization layer 600. For example, the upper surface of the color filter planarization layer 600 opposite to the device substrate 100 may be flat. Therefore, in a display device according to an embodiment of the present disclosure, spots caused by the horizontal difference between the upper surfaces of the color filters 500R, 500G, and 500B can be prevented.

[0089] Figure 6 It is a graph showing the brightness of a first green filter ① with a thickness of 1.3 μm, a second green filter ② with a thickness of 1.5 μm, and a third green filter ③ with a thickness of 2.0 μm, according to the viewing angle. Figure 7 This is a graph showing the brightness of a first blue filter ① with a thickness of 1.3 μm, a second blue filter ② with a thickness of 1.5 μm, and a third blue filter ③ with a thickness of 2.0 μm, according to a viewing angle. In this text, the first, second, and third green filters comprise green pigments, and the first, second, and third blue filters comprise blue pigments.

[0090] Reference Figure 6 and Figure 7Light passing through a green color filter containing green pigment and light passing through a blue color filter containing blue pigment can have different brightness depending on the viewing angle of a viewer with the same viewing angle. For example, green and blue perceived by a viewer with a viewing angle of 30° to 40° to the right from the front can have different brightness than green and blue perceived by a viewer with a viewing angle of 30° to 40° to the left from the front. As the thickness of the green color filter containing green pigment and the thickness of the blue color filter containing blue pigment increase, the asymmetry of the brightness of green and blue depending on the viewing direction can be reduced. Therefore, in a display device according to an embodiment of the present disclosure, the thickness of the green color filter 500G overlapping the green emitting region G-EA and the thickness of the blue color filter 500B overlapping the blue emitting region B-EA can be increased. For example, in a display device according to an embodiment of the present disclosure, the thickness of the green color filter 500G and the thickness of the blue color filter 500B can be greater than or equal to 2.0 μm. Therefore, in a display device according to an embodiment of the present disclosure, brightness asymmetry caused by the green filter 500G and the blue filter 500B depending on the viewing direction can be prevented or minimized.

[0091] Figure 8 This is a graph showing the brightness of a first red filter ① with a thickness of 1.3 μm, a second red filter ② with a thickness of 1.5 μm, and a third red filter ③ with a thickness of 2.0 μm, according to the viewing angle. In this paper, the first red filter, the second red filter, and the third red filter all contain red pigment.

[0092] Reference Figure 8 The brightness of red perceived by viewers with the same viewing angle can vary depending on the viewing direction. For example, red perceived by a viewer with a viewing angle of 30° to 40° to the right from the front may have a different brightness than red perceived by a viewer with a viewing angle of 30° to 40° to the left from the front. The asymmetry of red brightness depending on the viewing direction cannot be improved by changing the thickness of the red color filter containing red pigment. Therefore, in the display device according to an embodiment of the present disclosure, the thickness of the red color filter 500R overlapping the red emitting region R-EA can be minimized. For example, in the display device according to an embodiment of the present disclosure, the thickness of the red color filter 500R can be 1.3 μm. Therefore, in the display device according to an embodiment of the present disclosure, the red color filter 500R can have a smaller thickness than the green color filter 500G and the blue color filter 500B.

[0093] Reference Figure 4 and Figure 5In a display device according to an embodiment of the present disclosure, a red color filter 500R may have a curved region CA toward the color filter planarization layer 600. The curved region CA of the red color filter 500R may have a concave shape relative to the center of the red color filter 500R. For example, the thickness of the red color filter 500R may decrease from an edge region located near the green color filter 500G or the blue color filter 500B toward a central region including the center. The red color filter 500R may have a symmetrical shape relative to the central region. For example, the portion of the curved region CA located near the green color filter 500G may have the same curvature as the portion of the curved region CA located near the blue color filter 500B.

[0094] The concave curved region CA of the red color filter 500R can be filled by the color filter planarization layer 600. The color filter planarization layer 600 can be in direct contact with the curved region CA of the red color filter 500R. For example, the thickness difference caused by the curved region CA of the red color filter 500R can be removed by the color filter planarization layer 600.

[0095] The color filter planarization layer 600 may have a refractive index greater than that of the red color filter 500R. Therefore, in the display device according to an embodiment of the present disclosure, light passing through the red color filter 500R can converge due to the difference in refractive index between the red color filter 500R and the color filter planarization layer 600. For example, in the display device according to an embodiment of the present disclosure, light L1 passing through the red color filter 500R and traveling towards the blue color filter 500B, and light L2 passing through the red color filter 500R and traveling towards the green color filter 500G, can be refracted towards the interior of the red emitting region R-EA at the boundary between the curved region CA and the color filter planarization layer 600. That is, in the display device according to an embodiment of the present disclosure, the boundary between the curved region CA of the red color filter 500R and the color filter planarization layer 600 can be used as a convex lens. Therefore, in the display device according to an embodiment of the present disclosure, the brightness of the red light emitted from the red emitting region R-EA can be increased. Furthermore, in the display device according to the embodiments of this disclosure, the overall brightness of the image recognized by the user can be improved.

[0096] Therefore, a display device according to an embodiment of the present disclosure may include: a light-emitting device 300 on light-emitting regions R-EA, G-EA, and B-EA of a device substrate 100; color filters 500R, 500G, and 500B on the light-emitting device 300; and a color filter planarization layer 600 on the color filters 500R, 500G, and 500B, wherein the red color filter 500R overlapping the red light-emitting region R-EA may have a smaller thickness than the green color filter 500G overlapping the green light-emitting region G-EA and the blue color filter 500B overlapping the blue light-emitting region B-EA, wherein the red color filter 500R may include a curved region CA in contact with the color filter planarization layer 600, and wherein the color filter planarization layer 600 may have a larger refractive index than the red color filter 500R. Therefore, in the display device according to the embodiments of the present disclosure, the asymmetry of the brightness of green and blue depending on the user's viewing direction can be prevented or reduced, and the brightness of red light emitted from the red emitting region R-EA can be increased. Therefore, in the display device according to the embodiments of the present disclosure, the quality of the image provided to the user and the overall brightness can be improved. Furthermore, in the display device according to the embodiments of the present disclosure, low-power operation is possible and power consumption can be reduced.

[0097] The display device according to an embodiment of the present disclosure is described as having a driving circuit DC for each pixel region PA composed of a first thin-film transistor TR1, a second thin-film transistor TR2, and a storage capacitor Cst. However, in another embodiment of the display device according to the present disclosure, the driving circuit DC for each pixel region PA may include a driving thin-film transistor and at least one switching thin-film transistor. For example, in another embodiment of the display device according to the present disclosure, the driving circuit DC for each pixel region PA may further include a third thin-film transistor for initializing the storage capacitor Cst of the corresponding pixel region PA according to a gate signal. The third thin-film transistor of each pixel region PA 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 region. The third well region, the third drain region, and the third source region may be formed in the device substrate 100. The third gate electrode of each pixel region PA may be electrically connected to a gate line GL, the third drain electrode of each pixel region PA may be electrically connected to an initial line for applying an initial signal, and the third source electrode of each pixel region PA may be electrically connected to the storage capacitor Cst of the corresponding pixel region PA. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in configuring each drive circuit DC can be increased.

[0098] In a display device according to an embodiment of the present disclosure, the positions and electrical connections of the first drain electrode, first source electrode, second drain electrode 225, and second source electrode 227 of each driving circuit DC can vary depending on the configuration of the corresponding driving circuit DC and / or the types of the corresponding thin-film transistors TR1 and TR2. For example, in a display device according to another embodiment of the present disclosure, the second gate electrode 223 of each driving circuit DC can be electrically connected to the first drain electrode of the corresponding driving circuit DC. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in the configuration of each driving circuit DC and the type of each thin-film transistor TR1 and TR2 can be increased.

[0099] The display device according to embodiments of the present disclosure is described as having a first well region, a second drain region 102d, and a second source region 102s for each pixel region PA comprising p-type impurities, and a first drain region, a first source region, and a second well region 102w for each pixel region PA comprising n-type impurities. However, in another embodiment of the display device according to the present disclosure, the second well region 102w for each pixel region PA may include conductive impurities of the same type as the first well region of the corresponding pixel region PA. For example, in another embodiment of the display device according to the present disclosure, the first well region and the second well region 102w for each pixel region PA may include p-type impurities, and the first drain region, the first source region, the second drain region 102d, and the second source region 102s for each pixel region PA may include n-type impurities. Therefore, in another embodiment of the display device according to the present disclosure, the degree of freedom in the configuration of each driving circuit DC and the type of each thin-film transistor TR1 and TR2 can be increased.

[0100] The display device according to an embodiment of the present disclosure is described as having a device substrate 100 formed from a wafer of a semiconductor material such as silicon. However, in another embodiment of the display device according to the present disclosure, the device substrate 100 may include glass or plastic. In another embodiment of the display device according to the present disclosure, a driving circuit DC for each pixel region PA may be formed on the upper surface of the device substrate 100. For example, in another embodiment of the display device according to the present disclosure, a buffer insulating layer comprising inorganic insulating materials such as silicon oxide (SiOx) and silicon nitride (SiNx) may be formed on the upper surface of the device substrate 100, and each of the first thin-film transistor TR1 and the second thin-film transistor TR2 in each pixel region PA may include a semiconductor pattern formed on the buffer insulating layer. The semiconductor pattern 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 in each pixel region PA may include an oxide semiconductor such as IGZO. Therefore, in another embodiment of the display device according to the present disclosure, the degree of freedom in the material of the device substrate 100 and the configuration of each driving circuit DC can be increased.

[0101] The display device according to embodiments of the present disclosure is described as having each of color filters 500R, 500G, and 500B comprising a pigment. However, in a display device according to another embodiment of the present disclosure, at least one of the color filters 500R, 500G, and 500B may be made of different types of materials. For example, in a display device according to another embodiment of the present disclosure, the blue color filter 500B may comprise a blue dye. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in the materials used for the color filters 500R, 500G, and 500B can be increased.

[0102] The display device according to an embodiment of the present disclosure is described as having a red color filter 500R with a thickness smaller than that of the green color filter 500G and the blue color filter 500B, including a curved region CA. However, in a display device according to another embodiment of the present disclosure, the green color filter 500G and / or the blue color filter 500B may have a relatively small thickness. Therefore, in a display device according to another embodiment of the present disclosure, each of the color filters 500R, 500G, and 500B may include a lower surface facing the device substrate 100 and an upper surface opposite to the lower surface, the upper surface of the red color filter 500R may be parallel to the lower surface of the red color filter 500R, and the upper surface of the green color filter 500G and / or the upper surface of the blue color filter 500B may include a curved region CA. In other words, in a display device according to another embodiment of the present disclosure, the brightness asymmetry of at least one of the color filters 500R, 500G, and 500B can be improved by increasing the thickness, and the brightness of color filters 500R, 500G, and 500B, in which the brightness asymmetry cannot be improved by increasing the thickness, can be improved by using a curved region CA. Therefore, in a display device according to another embodiment of the present disclosure, the quality of the image recognized by the user can be improved, regardless of the configuration of the color filters 500R, 500G, and 500B.

[0103] The display device according to an embodiment of the present disclosure is described as having an edge region of red color filter 500R with the same thickness as green color filter 500G and blue color filter 500B. However, in another embodiment of the display device according to the present disclosure, the maximum thickness of red color filter 500R may differ from the thickness of green color filter 500G and blue color filter 500B. For example, in another embodiment of the display device according to the present disclosure, the upper surfaces of green color filter 500G and blue color filter 500B facing the color filter planarization layer may be partially covered by the edge region of the red color filter, such as... Figure 9 As shown in the diagram, the overlapping areas of the red color filter 500R and the green color filter 500G, as well as the overlapping areas of the red color filter 500R and the blue color filter 500R, can be located within the non-light-emitting area. For example, the overlapping areas of the red color filter 500R and the green color filter 500G, as well as the overlapping areas of the red color filter 500R and the blue color filter 500R, can overlap with the separation trench ST. Therefore, in a display device according to another embodiment of the present disclosure, light passing through the red color filter 500R and traveling towards the blue color filter 500B or the green color filter 500G can be effectively focused. Therefore, in a display device according to another embodiment of the present disclosure, the overall brightness of the image provided to the user can be effectively improved.

[0104] The display device according to an embodiment of the present disclosure is described as having the color filter planarization layer 600 in direct contact with the curved region CA of the red color filter 500R. However, in another embodiment of the display device according to the present disclosure, the color filter planarization layer 600 may be spaced apart from the curved region CA of the red color filter 500R. For example, in another embodiment of the display device according to the present disclosure, an intermediate insulating layer 550 may be provided between the curved region CA of the red color filter 500R and the color filter planarization layer 600, such as... Figure 10 As shown in the diagram. The intermediate insulating layer 550 may include an insulating material. The intermediate insulating layer 550 may fill the curved region CA of the red filter 500R. For example, the intermediate insulating layer 550 may include an organic insulating material. The upper surface of the intermediate insulating layer 550 facing the filter planarization layer 600 may have the same level as the upper surface of the green filter 500G and the upper surface of the blue filter 500B. For example, the upper surface of the intermediate insulating layer 550 facing the filter planarization layer 600 may be continuous with the upper surface of the green filter 500G and the upper surface of the blue filter 500B.

[0105] The refractive index of the intermediate insulating layer 550 can be greater than that of the red color filter 500R. Therefore, in a display device according to another embodiment of the present disclosure, the boundary between the curved region CA of the red color filter 500R and the intermediate insulating layer 550 can be used as a convex lens. Therefore, in a display device according to an embodiment of the present disclosure, the light extraction efficiency of the red emitting region R-EA can be improved, regardless of the material of the color filter planarization layer 600. That is, in a display device according to another embodiment of the present disclosure, the degree of freedom in choosing the material of the color filter planarization layer 600 can be increased.

[0106] The display device according to an embodiment of the present disclosure is described as having a red color filter 500R with a shape symmetrical with respect to a central region. However, in another embodiment of the display device according to the present disclosure, the curved region CA of the red color filter 500R may have various shapes. For example, in another embodiment of the display device according to the present disclosure, the curved region CA of the red color filter 500R may include a first curved surface C1 positioned near the blue color filter 500B and a second curved surface C2 positioned near the green color filter 500G, and the curvature of the second curved surface C2 may be different from the curvature of the first curved surface C1, such as... Figure 11As shown in the diagram. For example, the second edge region of the red filter 500R that overlaps with the second curved surface C2 may have a different thickness than the first edge region of the red filter 500R that overlaps with the first curved surface C1. The first curved surface C1 may have a concave shape toward the boundary between the red filter 500R and the blue filter 500B, and the second curved surface C2 may have a concave shape toward the boundary between the red filter 500R and the green filter 500G. The shape of the second curved surface C2 may be different from the shape of the first curved surface C1. Therefore, in a display device according to another embodiment of the present disclosure, the amount of light converged through the first curved surface C1 may be different from the amount of light converged through the second curved surface C2. Therefore, in a display device according to another embodiment of the present disclosure, by using the shape of the curved region CA, the asymmetry of the brightness of red light passing through the red filter 500R according to the viewing direction can be reduced.

[0107] In another embodiment of the display device according to this disclosure, the curved region CA of the red color filter 500R may have a convex shape relative to the center of the red color filter 500R, and the color filter planarization layer 600 contacting the curved region CA may have a refractive index lower than that of the red color filter 500R, such as... Figure 12 As shown in the diagram. Therefore, in a display device according to another embodiment of the present disclosure, due to the difference in refractive index, the boundary between the curved region CA of the red color filter 500R and the color filter planarization layer 600 can be used as a convex lens. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in the shape of the curved region CA can be increased.

[0108] The display device according to an embodiment of the present disclosure is described as having a curved region CA on the surface of the red color filter 500R facing the color filter planarization layer 600. However, in the display device according to an embodiment of the present disclosure, the upper surface of the red color filter 500R facing the color filter planarization layer 600 may be continuous with the upper surfaces of the green color filter 500G and the blue color filter 500B. For example, in another embodiment of the display device according to the present disclosure, a condenser lens 700 may be disposed between the encapsulation structure 400 and the red color filter 500R, the surface of the condenser lens 700 facing the device substrate 100 may have a convex shape, and the lower surface of the red color filter 500R facing the device substrate 100 may be in direct contact with the convex surface of the condenser lens 700, such as... Figure 13 As shown in the image.

[0109] The lower surface of the condenser lens 700 facing the device substrate 100 can directly contact the upper surface of the third encapsulation layer 430. For example, the lower surface of the condenser lens 700 can be continuous with the lower surfaces of the green color filter 500G and the blue color filter 500B. The condenser lens 700 can overlap with the red emitting region R-EA. The condenser lens 700 cannot overlap with the green emitting region G-EA and the blue emitting region B-EA. For example, the condenser lens 700 can be completely covered by the red color filter 500R.

[0110] The condenser lens 700 may include a transparent material. The condenser lens 700 may include an insulating material. The condenser lens 700 may include a polymer material. The refractive index of the condenser lens 700 may be greater than the refractive index of the red filter 500R. Therefore, in a display device according to another embodiment of the present disclosure, the boundary between the condenser lens 700 and the red filter 500R can be used as a convex lens. Therefore, in a display device according to another embodiment of the present disclosure, the degree of freedom in the position of the curved region CA can be increased.

[0111] In another embodiment of the display device according to this disclosure, the red color filter 500R on the condenser lens 700 may include: a lower surface having a convex shape that contacts the condenser lens 700; and a curved region having a concave shape that contacts the color filter planarization layer 600. That is, in another embodiment of the display device according to this disclosure, the lower and upper portions of the red color filter 500R may include surfaces that serve as convex lenses. Therefore, in another embodiment of the display device according to this disclosure, light passing through the red color filter 500R can be effectively converged. Therefore, in another embodiment of the display device according to this disclosure, brightness asymmetry according to the viewing direction can be improved, and overall brightness can be increased.

[0112] As a result, the display device according to embodiments of the present disclosure may include: light-emitting devices on a light-emitting area of ​​a device substrate; color filters on the light-emitting devices; and a color filter planarization layer on the color filters, wherein each light-emitting device can display the same color as an adjacent light-emitting device, wherein the color filters may include a first color filter and a second color filter made of a different material than the first color filter, and wherein at least one of the lower surface and the upper surface of the second color filter may include a curved region. Therefore, in the display device according to embodiments of the present disclosure, brightness deviation according to the direction in which a viewer views an image at the same viewing angle can be improved, and overall brightness can be increased. Therefore, in the display device according to embodiments of the present disclosure, the efficiency of each light-emitting device can be improved. Furthermore, in the display device according to embodiments of the present disclosure, low-power operation is possible and power consumption can be reduced.

Claims

1. A display device, comprising: Light-emitting devices on the light-emitting area of ​​a device substrate; A color filter on the light-emitting device, the color filter overlapping the light-emitting area; as well as A color filter planarization layer extends beyond each light-emitting area on the color filter. The color filter includes a first color filter and a second color filter, wherein the second color filter comprises a different material than the first color filter. The second color filter includes a central region and a first edge region disposed between the central region and the first color filter, and The thickness of the second color filter gradually changes from the first edge region toward the central region.

2. The display device according to claim 1, wherein the thickness of the central region of the second color filter is less than the thickness of the first edge region of the second color filter, and The thickness of the first color filter is the same as the thickness of the first edge region of the second color filter.

3. The display device according to claim 1, wherein the upper surface of the second color filter opposite to the device substrate includes a curved region connecting the central region and the first edge region of the second color filter, and The curved region of the second color filter has a concave shape toward the boundary between the first color filter and the second color filter.

4. The display device according to claim 3, wherein the curved region of the second color filter contacts the color filter planarization layer, and The color filter planarization layer has a larger refractive index than the second color filter.

5. The display device of claim 1, wherein the color filter further comprises a third color filter, the third color filter comprising a material different from the first color filter and the second color filter. The second color filter is disposed between the first color filter and the third color filter. The second color filter includes a second edge region disposed between the central region of the second color filter and the third color filter, and The thickness of the second color filter gradually changes from the second edge region toward the central region.

6. The display device according to claim 5, wherein the second edge region of the second color filter has a shape that is symmetrical with respect to the central region of the second color filter and the first edge region.

7. The display device according to claim 5, wherein the first color filter is a color filter comprising blue pigment, the second color filter is a color filter comprising red pigment, and the third color filter is a color filter comprising green pigment.

8. The display device of claim 5, wherein the first edge region of the second color filter includes a portion overlapping with the first color filter, and the second edge region of the second color filter includes a portion overlapping with the third color filter.

9. The display device of claim 5, wherein each of the first color filter, the second color filter, and the third color filter includes a lower surface facing the device substrate. The lower surface of the second color filter is disposed on the same layer as the lower surfaces of the first and third color filters, and The thickness of the third color filter is the same as the thickness of the first color filter.

10. The display device according to claim 9, wherein the thickness of the second edge region of the second color filter is different from the thickness of the first edge region of the second color filter.

11. The display device according to claim 7, wherein the thickness of each of the first color filter and the third color filter is greater than or equal to 2.0 μm.

12. The display device according to claim 1, wherein an intermediate insulating layer is provided between the upper surface of the second color filter and the color filter planarization layer, and The intermediate insulating layer has a higher refractive index than the second color filter.

13. The display device of claim 12, wherein the upper surface of the intermediate insulating layer facing the color filter planarization layer is continuous with the upper surface of the first color filter.

14. The display device of claim 1, wherein the upper surface of the second color filter opposite to the device substrate includes a curved region connecting the central region and the first edge region. The curved region has a convex shape toward the boundary between the first color filter and the second color filter, and The color filter planarization layer that contacts the curved region has a smaller refractive index than the second color filter.

15. The display device of claim 5, wherein the upper surface of the second color filter includes a first curved surface configured to be adjacent to the first color filter and a second curved surface configured to be adjacent to the third color filter, and The curvature of the second curved surface is different from the curvature of the first curved surface.

16. The display device of claim 1, further comprising a focusing lens between the light-emitting device and the second color filter, and The surface of the condenser lens facing the color filter planarization layer has a convex shape.

17. The display device of claim 16, wherein the second color filter has a smaller refractive index than the condenser lens.

18. The display device of claim 16, wherein the second color filter comprises a lower surface having a convex shape that contacts the condenser lens; and an upper surface having a concave shape that contacts the color filter planarization layer.

19. A display device, comprising: A device substrate, the device substrate including a first light-emitting region and a second light-emitting region, wherein the second light-emitting region realizes a different color from the first light-emitting region; A first light-emitting device on the first light-emitting area of ​​the device substrate, the first light-emitting device having a stacked structure of a first lower electrode, a first light-emitting unit and a first upper electrode; A second light-emitting device on the second light-emitting region of the device substrate, the second light-emitting device having a stacked structure of a second lower electrode, a second light-emitting unit and a second upper electrode; A first color filter on the first light-emitting device, the first color filter overlapping the first light-emitting area; A second color filter on the second light-emitting device, the second color filter overlapping with the second light-emitting area; as well as A color filter planarization layer on the first color filter and the second color filter. The light generated by the second light-emitting unit displays the same color as the light generated by the first light-emitting unit. Each of the first color filter and the second color filter includes a lower surface facing the device substrate and an upper surface facing the color filter planarization layer, and At least one of the lower and upper surfaces of the second color filter has a concave shape facing the center of the second color filter.

20. The display device according to claim 19, wherein the upper surface of the first color filter has a shape parallel to the lower surface of the first color filter.

21. The display device of claim 19, further comprising a focusing lens between the second light-emitting device and the second color filter. The condensing lens overlaps with the second light-emitting area. The end of the condenser lens is located outside the first light-emitting area, and The surface of the condenser lens facing the color filter planarization layer has a convex shape.

22. The display device of claim 21, wherein the lower surface of the second color filter is in contact with the surface of the condenser lens facing the planarization layer of the color filter.

23. The display device of claim 21, wherein the second color filter has a smaller refractive index than the condenser lens.

24. The display device according to claim 23, wherein the upper surface of the second color filter is continuous with the upper surface of the first color filter.

25. The display device of claim 21, further comprising an encapsulation structure between the first light-emitting device and the first color filter, the encapsulation structure extending between the second light-emitting device and the second color filter. The lower surface of the condenser lens facing the device substrate and the lower surface of the first color filter are in contact with the upper surface of the packaging structure facing the planarization layer of the color filter.

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