Display apparatus having light emitting device

Abstract

A display apparatus having a light emitting device is provided. The light emitting device may be disposed on the light emitting region of the device substrate. A color filter may be disposed on the light emitting area. A lens structure may be disposed between the light emitting device and the color filter of each light emitting region. Each lens structure may include at least three layers. Each of the boundaries between the layers within each lens structure may have a convex shape toward the device substrate. Accordingly, in the display device, light condensation efficiency may be improved.

Description

Technical Field

[0001] The present disclosure relates to a display device in which a light-emitting device is provided in each light-emitting region. More specifically, for example but not limited to, the present disclosure relates to a display device capable of simplifying a process for forming a lens structure for concentrating light emitted from each light-emitting device. Background Art

[0002] Generally, a display device provides an image to a user. For example, the display device may include a plurality of light-emitting devices. Each light-emitting device may emit light of a specific color. For example, each light-emitting device may include a light-emitting unit disposed between a first electrode and a second electrode.

[0003] An image implemented by the display device may include various colors. For example, the display device may include color filters disposed on the light-emitting devices. Each color filter may include a material different from that of an adjacent color filter. For example, the color filters may include a red color filter that displays red, a green color filter that displays green, and a blue color filter that displays blue. Summary of the Invention

[0004] The inventors of the present application have found that light passing through each color filter can be focused by a lens. For example, a lens having a hemispherical shape may be disposed on the color filter. However, in a display device, the size of each lens may decrease as the resolution increases. Therefore, in a display device, a process for forming the lens may become complicated, and the uniformity of the lens may decrease. Also, in a display device, luminance deviation may occur due to differences in lens shapes. Therefore, in a display device, the quality of the image may deteriorate.

[0005] Accordingly, the present disclosure relates to a display device that substantially eliminates one or more problems caused by limitations and disadvantages of the related art.

[0006] An object of the present disclosure is to provide a display device capable of simplifying a process for forming a lens structure for concentrating light emitted from each light-emitting device.

[0007] Another object of the present disclosure is to provide a display device capable of improving the uniformity of a lens structure disposed on a light-emitting region.

[0008] Additional advantages, objects, and features of the present disclosure will be partially set forth in the following description, and partially will become apparent to those of ordinary skill in the art upon examination of the following description, or may be learned from practice of the present disclosure. The objects and other advantages of the present disclosure may be realized and obtained by the structures particularly pointed out in the written description and claims and the drawings.

[0009] To achieve these objects and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, a display device including a device substrate is provided. A light-emitting device and a packaging structure are disposed on the device substrate. The light-emitting device is disposed in a light-emitting region of the device substrate. The packaging structure covers the light-emitting device. A lens structure and a barrier are disposed on the packaging structure. The lens structure includes a first lens insulating layer, a second lens insulating layer, and a lens passivation layer that are sequentially stacked on the packaging structure in the light-emitting region. The barrier is in contact with a side portion of the lens structure. A color filter is disposed on the lens structure. The color filter overlaps with the light-emitting region. The second lens insulating layer has a larger refractive index than the first lens insulating layer. The lens passivation layer has a larger refractive index than the second lens insulating layer. The upper surfaces of the first lens insulating layer and the second lens insulating layer facing the color filter have a concave shape facing the device substrate.

[0010] The upper surface of the second lens insulating layer may have the same curvature as the upper surface of the first lens insulating layer.

[0011] The barrier may include a material having a higher reflectivity than the first lens insulating layer, the second lens insulating layer, and the lens passivation layer.

[0012] The barrier may include a metal.

[0013] The lens passivation layer may include a material harder than the first lens insulating layer and the second lens insulating layer.

[0014] The first lens insulating layer and the second lens insulating layer may include an organic insulating material. The lens passivation layer may include an inorganic insulating material.

[0015] The upper surface of the lens passivation layer facing the color filter may have a concave shape facing the device substrate.

[0016] The upper end of the barrier facing the color filter may be spaced apart from the color filter. The lens passivation layer may extend between the upper end of the barrier and the color filter.

[0017] The refractive index of the color filter may be greater than the refractive index of the lens passivation layer.

[0018] The refractive index of the color filter may be less than the refractive index of the lens passivation layer.

[0019] The upper surface of the lens passivation layer may have the same curvature as the upper surface of the second lens insulating layer.

[0020] The thickness of the first lens insulating layer disposed in each light-emitting region may gradually increase from a central region of the corresponding light-emitting region toward the barrier.

[0021] The boundary between the first lens insulating layer and the second lens insulating layer disposed in each light-emitting region may function as a lens.

[0022] The boundary between the second lens insulating layer and the lens passivation layer provided in each light-emitting region can be used for the function of the lens.

[0023] In another embodiment, a display device including a device substrate is provided. A first light-emitting device is disposed on a first light-emitting region of the device substrate. A packaging structure is disposed on the first light-emitting device. The packaging structure extends outside the first light-emitting region. A first lens structure and a first barrier are disposed on the packaging structure. The first lens structure includes at least three layers stacked on the packaging structure of the first light-emitting region. The first barrier is in contact with a side portion of the first lens structure. A first color filter is disposed on the first lens structure. The first color filter overlaps the first light-emitting region. Each layer of the first lens structure has a greater refractive index as it is farther from the packaging structure. Each of the boundaries between the layers within the first lens structure has a convex shape facing the device substrate.

[0024] The vertical distance between the device substrate and each boundary can increase from the central region of the light-emitting region to the first barrier.

[0025] A second light-emitting device may be disposed between a second light-emitting region of the device substrate and the packaging structure. A second lens structure may be disposed on the packaging structure of the second light-emitting region. The second lens structure may have a stacked structure of at least three layers. A second barrier in contact with a side portion of the second lens structure may be disposed on the packaging structure. A second color filter may be disposed on the second lens structure. The second color filter may overlap the second light-emitting region. The first barrier and the second barrier may extend in a first direction. The second light-emitting region may be arranged side by side with the first light-emitting region in the first direction. The second color filter may include the same material as the first color filter.

[0026] The second barrier may be spaced apart from the first barrier between the first light-emitting region and the second light-emitting region.

[0027] A third barrier may be disposed between the first light-emitting region and the second light-emitting region. The third barrier may extend in a second direction perpendicular to the first direction.

[0028] A third light-emitting device may be disposed between a third light-emitting region of the device substrate and the packaging structure. The third lens structure may include at least three layers stacked on the packaging structure of the third light-emitting region. A fourth barrier may be disposed on the packaging structure, and the fourth barrier is in contact with a side portion of the third lens structure. A third color filter may be disposed on the third lens structure, and the third color filter may overlap the third light-emitting region. Each layer of the third lens structure has a greater refractive index as it is farther from the packaging structure. Each of the boundaries between the layers within the third lens structure has a convex shape facing the device substrate.

[0029] In yet another embodiment, a display device including a device substrate is provided. Light-emitting devices are disposed on a plurality of light-emitting regions of the device substrate. A packaging structure is disposed on the device substrate. The packaging structure covers the light-emitting devices. Each of the plurality of lens structures includes a plurality of layers stacked on the packaging structure of the plurality of light-emitting regions. A plurality of color filters are disposed on the plurality of lens structures, and each of the plurality of color filters overlaps with each of the plurality of light-emitting regions. Each layer of each of the plurality of lens structures has a greater refractive index as it is farther from the packaging structure. Each of the boundaries between the layers within each of the plurality of lens structures has a convex shape facing the device substrate.

[0030] It will be understood that the above general description and the following detailed description of the present disclosure are both exemplary and explanatory, and are intended to provide further explanation of the claimed disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0032] Figure 1 is a view schematically showing a display device according to an exemplary embodiment of the present disclosure;

[0033] Figure 2 is a view showing a circuit of a sub-pixel in a display device according to an exemplary embodiment of the present disclosure;

[0034] Figure 3 is Figure 1 an enlarged view of the K1 region in;

[0035] Figure 4 is a view taken along Figure 3 I-I' of;

[0036] Figure 5 is Figure 4 an enlarged view of the K2 region in;

[0037] Figures 6 to 8 is a view sequentially showing a method of forming a display device according to an exemplary embodiment of the present disclosure; and

[0038] Figures 9 to 13 is a view showing a display device according to another exemplary embodiment of the present disclosure.

[0039] Throughout the drawings and the detailed description, unless otherwise noted, the same reference numerals should be understood to refer to the same elements, features, and structures. For clarity, illustration, and convenience, the relative dimensions and descriptions of these elements may be exaggerated. DETAILED DESCRIPTION

[0040] Reference will now be made in detail to embodiments of the present disclosure, examples of which may be illustrated in the accompanying drawings. The performance of the described processing steps and / or operations is an example; however, the order of the steps and / or operations is not limited to the order set forth herein and may be changed as known in the art, except for steps and / or operations that must occur in a specific order. The names of the various elements used in the following explanations may have been chosen merely for convenience in preparing the specification and may thus be different from the names used in actual products.

[0041] Hereinafter, details related to the above objects, technical configurations, and operational effects of the embodiments of the present disclosure will be clearly understood through the following detailed description with reference to the accompanying drawings illustrating some embodiments of the present disclosure. Here, embodiments of the present disclosure are provided so that the technical spirit of the present disclosure can be satisfactorily transferred to those skilled in the art. Therefore, the present disclosure can be embodied in other forms and is not limited to the embodiments described below.

[0042] In addition, throughout the specification and the drawings, the same or very similar elements may be denoted by the same reference numerals, and for convenience, the lengths and thicknesses 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 so as to be in contact with the second element, a third element may be interposed between the first element and the second element.

[0043] Here, terms such as “first,” “second,” “A,” “B,” “(a),” and “(b)” may be used to distinguish any one element from another. However, without departing from the technical spirit of the present disclosure, the first element and the second element may be arbitrarily named according to the convenience of those skilled in the art. For example, without departing from the scope of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0044] The terms used in the specification of the present disclosure are only for describing specific embodiments and are not intended to limit the scope of the present disclosure. For example, an element described in the singular is intended to include a plurality of elements unless the context clearly indicates otherwise. In addition, in the specification of the present disclosure, it will also be understood that terms such as “comprising,” “including,” “containing,” “constituting,” “consisting of,” “formed of,” etc. specify the presence of the stated 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.

[0045] Moreover, unless the term "directly" is used, the terms "connected" and "coupled" may include two components being "connected" or "coupled" through one or more other components located between the two components.

[0046] It should be understood that the term "at least one" includes all combinations related to any item. For example, "at least one of the first element, the second element, and the third element" may include all combinations of two or more elements selected from the first, second, and third elements and each individual element among the first, second, and third elements.

[0047] The features of various embodiments of the present disclosure may be interconnected or combined in part or in whole, and may interoperate with each other in various ways and be technically driven. The embodiments of the present disclosure may be implemented independently of each other, or may be implemented together in a co-dependent relationship.

[0048] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments belong. It will also be understood that terms such as those defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0049] (Embodiment)

[0050] Figure 1 is a view schematically showing a display device according to an exemplary embodiment of the present disclosure. Figure 2 is a view showing a circuit of sub-pixels in a display device according to an exemplary embodiment of the present disclosure.

[0051] Reference Figure 1 and Figure 2 , a display device according to an exemplary embodiment of the present disclosure may include a display panel DP. The display panel DP may generate an image provided to a user. For example, the display panel DP may include a plurality of pixel regions PA. Various signals may be provided in each pixel region PA through signal wirings GL, DL, and PL. For example, the signal wirings GL, DL, and PL may include a gate line GL for applying a gate signal, a data line DL for applying a data signal, and a power voltage supply line PL for supplying a power voltage.

[0052] The gate line GL can be electrically connected to the gate driver GD. The data line DL can be electrically connected to the data driver DD. The power voltage supply line PL can be electrically connected to the power unit PU. The gate driver GD and the data driver DD can be controlled by the timing controller TC. For example, the gate driver GD can receive a clock signal, a reset signal, and a start signal from the timing controller TC, and the data driver DD can receive digital video data and a source timing signal from the timing controller TC.

[0053] The display panel DP may include a display area AA in which a pixel area PA is provided and a border area BZ (also referred to as an edge area) provided outside the display area AA. The pixel area PA does not overlap with the border area BZ. For example, the display area AA can be surrounded by the border area BZ. The gate driver GD, the data driver DD, the power unit PU, and the timing controller TC can be provided outside the display area AA, but are not limited thereto. For example, each of the signal wirings GL, DL, and PL may include an area provided on the border area BZ.

[0054] At least one of the gate driver GD, the data driver DD, the power unit PU, and the timing controller TC can be provided on the border area BZ. For example, a display device according to an exemplary embodiment of the present disclosure can be a GIP (gate-in-panel) type display device in which the gate driver GD is formed on the border area BZ of the display panel DP.

[0055] Figure 3 is Figure 1 An enlarged view of the K1 area in. Figure 4 is along Figure 3 The view taken along I-I' of. Figure 5 is Figure 4 An enlarged view of the K2 area in.

[0056] Referring to Figures 2 to 4 , in a display device according to an exemplary embodiment of the present disclosure, each pixel area PA may include a plurality of sub-pixels SP. Each sub-pixel SP can implement a specific color. For example, a light-emitting device 300 can be provided in each sub-pixel SP. The light-emitting device 300 of each sub-pixel SP can emit light of a specific color for display. For example, the light-emitting device 300 of each sub-pixel SP may include a first electrode 310 and a second electrode 330 and a light-emitting unit 320 provided between the first electrode 310 and the second electrode 330.

[0057] The first electrode 310 may include a conductive material. The first electrode 310 may include a material having a high reflectivity. For example, the first electrode 310 may be a metal such as aluminum (Al) and silver (Ag), but is not limited thereto. The first electrode 310 may have a multilayer structure. For example, the first electrode 310 may have a structure in which a reflective electrode made of a metal is disposed between transparent electrodes made of a transparent conductive material such as ITO and IZO.

[0058] The light-emitting unit 320 may generate light having a brightness corresponding to the voltage difference between the first electrode 310 and the second electrode 330. For example, the light-emitting unit 320 may include a light-emitting material layer (EML). The light-emitting material layer (EML) may include a light-emitting material. The light-emitting material may include an organic material, an inorganic material, or a hybrid material, but is not limited thereto. For example, a display device according to an exemplary embodiment of the present disclosure may be an organic light-emitting display device including an organic light-emitting material. In addition, a display device according to an exemplary embodiment of the present disclosure may be an inorganic light-emitting display device including an inorganic light-emitting material.

[0059] A plurality of light-emitting material layers (EML) may be provided in the light-emitting unit 320. As an example, the light-emitting unit 320 may include a first light-emitting stack 321 and a second light-emitting stack 323, and a charge generation layer 322 disposed between the first light-emitting stack 321 and the second light-emitting stack 323. For example, the light-emitting unit 320 may have a stacked structure of the first light-emitting stack 321 and the second light-emitting stack 323, and each of the first light-emitting stack 321 and the second light-emitting stack 323 may include at least one light-emitting material layer (EML). Each of the first light-emitting stack 321 and the second light-emitting stack 323 may emit light. For example, the charge generation layer 322 may be disposed between the first light-emitting stack 321 and the second light-emitting stack 323. The charge generation layer 322 may supply holes or electrons to the first light-emitting stack 321 and the second light-emitting stack 323.

[0060] The light generated by the second light-emitting stack 323 may display a color different from the color of the light generated by the first light-emitting stack 321. For example, the light-emitting material layer (EML) of the second light-emitting stack 323 may include a material different from the light-emitting material layer (EML) of the first light-emitting stack 321. The color presented by the light generated by the light-emitting unit 320 may be a color presented by overlapping 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 further include at least one functional layer to smoothly supply holes or electrons. For example, each of the first light-emitting stack 321 and the second light-emitting stack 323 may 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). Accordingly, in the display device according to an exemplary embodiment of the present disclosure, the efficiency of the light-emitting unit 320 may be increased.

[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, but is not limited thereto. The transmittance of the second electrode 330 may be higher 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 and IZO, or a semi-transparent electrode in which a metal such as Ag and Mg is thinly formed. Accordingly, in the display device according to an exemplary embodiment of the present disclosure, light generated by the light-emitting unit 320 may be emitted through the second electrode 330.

[0063] The light-emitting device 300 of each sub-pixel SP may be controlled independently of the light-emitting device 300 of an adjacent sub-pixel SP. For example, a driving circuit DC electrically connected to the light-emitting device 300 may be provided in each sub-pixel SP. The driving circuit DC of each sub-pixel SP may be electrically connected to the signal wirings GL, DL, and PL. For example, the driving circuit DC of each sub-pixel SP may be connected to one of the gate lines GL, one of the data lines DL, and one of the power voltage supply lines PL. The driving circuit DC of each sub-pixel SP may supply a driving current corresponding to a data signal to the light-emitting device 300 of the corresponding sub-pixel SP according to a gate signal of one frame. For example, the driving circuit DC of each sub-pixel SP may include a first thin film transistor TR1, a second thin film transistor TR2, and a storage capacitor Cst, but is not limited thereto, and may further include more or fewer elements than those shown. Figure 2 The example shown represents a 2T1C structure in which two transistors and one capacitor are provided, but embodiments of the present invention are not limited thereto. For example, 3T1C, 4T1C, 5T1C, 3T2C, 4T2C, 5T2C, 6T2C, 7T1C, 7T2C, 8T2C structures, etc. are also possible.

[0064] The driving circuit DC and the light-emitting device 300 of each sub-pixel SP can be supported by the 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. At least one of the driving circuits DC in each sub-pixel SP can be formed within the device substrate 100. Therefore, in the display device according to the exemplary embodiment of the present disclosure, the density of the pixel circuits formed in each sub-pixel SP can be increased. Therefore, in the display device according to the exemplary embodiment of the present disclosure, the resolution of the image can be improved.

[0065] The first thin-film transistor TR1 of each sub-pixel SP can transmit a data signal to the second thin-film transistor TR2 of the corresponding sub-pixel SP according to a gate signal. For example, the first thin-film transistor TR1 of each sub-pixel SP can be a switching thin-film transistor. The first thin-film transistor TR1 of each sub-pixel SP can include a first well region, a first drain region, a first source region, a first gate, a first drain, and a first source. For example, the first gate of the first thin-film transistor TR1 of each sub-pixel SP can be electrically connected to the corresponding gate line GL, and the first drain of the first thin-film transistor TR1 of each sub-pixel SP can be electrically connected to the corresponding data line DL, and the first source of the first thin-film transistor TR1 of each sub-pixel SP can be electrically connected to the second gate of the second thin-film transistor TR2 of each sub-pixel SP.

[0066] The first well region, the first drain region, and the first source region can be formed within the device substrate 100. For example, the first well region, the first drain region, and the first source region can be formed by a process of doping the device substrate 100 with a conductive impurity. The first drain region and the first source region can include a conductive impurity different from that of the first well region. For example, the first well region can include a P-type impurity, and the first drain region and the first source region can include an N-type impurity. The first drain region and the first source region can be formed in the first well region. For example, a part of the first well region disposed between the first drain region and the first source region in each sub-pixel SP can be used as the first channel region of the first thin-film transistor TR1 in the corresponding sub-pixel SP.

[0067] The first gate may be disposed on the device substrate 100. The first gate may be disposed between the first drain region and the first source region. For example, the first gate of each sub-pixel SP may overlap with a portion of the first well region that serves as the first channel region in the corresponding sub-pixel SP. The first gate may include a conductive material. For example, the first gate may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W), but is not limited thereto. The first gate may be spaced apart from the device substrate 100. The first gate may be insulated from the device substrate 100. For example, the first drain region may be electrically connected to the first source region in accordance with a voltage applied to the first gate.

[0068] The first drain may be disposed on the device substrate 100. The first drain may include a conductive material. For example, the first drain may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W), but is not limited thereto. The first drain may include a material different from that of the first gate. For example, the first drain may be disposed on a layer different from the first gate. The first drain may be electrically connected to the first drain region. The first drain may be insulated from the first gate.

[0069] The first source may be disposed on the device substrate 100. The first source may include a conductive material. For example, the first source may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W), but is not limited thereto. The first source may include a material different from that of the first gate. The first source may be disposed on a layer different from the first gate. For example, the first source may be disposed on the same layer as the first drain. The first source may include the same material as the first drain. The first source may be formed by the same process as the first drain. For example, the first source may be formed simultaneously with the first drain. The first source may be electrically connected to the first source region. The first source may be insulated from the first gate. The first source may be spaced apart from the first drain.

[0070] The second thin film transistor TR2 of each sub-pixel SP can generate a driving current corresponding to the data signal. For example, the second thin film transistor TR2 of each sub-pixel SP can be a driving thin film transistor. The second thin film transistor TR2 of each sub-pixel SP can include a second well region 102w, a second drain region 102d, a second source region 102s, a second gate 223, a second drain 225, and a second source 227. For example, the second gate 223 of the second thin film transistor TR2 of each sub-pixel SP can be electrically connected to the first source of the first thin film transistor TR1 of the corresponding sub-pixel SP, and the second drain 225 of the second thin film transistor TR2 of each sub-pixel SP can be electrically connected to the corresponding power supply voltage line PL, and the second source 227 of the second thin film transistor TR2 of each sub-pixel SP can be electrically connected to the light emitting device 300 of each sub-pixel SP. The light emitting device 300 of each sub-pixel SP can be electrically connected to the second source 227 of the corresponding sub-pixel SP.

[0071] The second well region 102w, the second drain region 102d, and the second source region 102s can be formed within the device substrate 100. For example, the second well region 102w, the second drain region 102d, and the second source region 102s can be formed by a process of doping the device substrate 100 with a conductive impurity. The second drain region 102d and the second source region 102s can include a conductive impurity different from that of the second well region 102w. The second thin film transistor TR2 of each sub-pixel SP can have electrical characteristics different from those of the first thin film transistor TR1 of the corresponding sub-pixel SP. For example, the second well region 102w can include an N-type impurity, and the second drain region 102d and the second source region 102s can include a P-type impurity.

[0072] The second well region 102w can include the same conductive impurity as the first drain region and the first source region. The second well region 102w can be formed by the same process as the first drain region and the first source region. For example, the second well region 102w can be formed simultaneously with the first drain region and the first source region. The second drain region 102d and the second source region 102s can include the same conductive impurity as the first well region. The second drain region 102d and the second source region 102s can be formed by the same process as the first well region. For example, the second drain region 102d and the second source region 102s can be formed simultaneously with the first well region. Therefore, in the display device according to an exemplary embodiment of the present disclosure, the process efficiency can be improved.

[0073] The second drain region 102d and the second source region 102s can be formed within the second well region 102w. For example, a part of the second well region 102w disposed between the second drain region 102d and the second source region 102s in each sub-pixel SP can be used as the second channel region of the second thin film transistor TR2 in the corresponding sub-pixel SP.

[0074] The second gate 223 may be disposed on the device substrate 100. The second gate 223 may be disposed between the second drain region 102d and the second source region 102s. For example, the second gate 223 of each sub-pixel SP may overlap with a portion of the second well region 102w that serves as the second channel region in the corresponding sub-pixel SP. The second gate 223 may include a conductive material. For example, the second gate 223 may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W), but is not limited thereto. The second gate 223 may be spaced apart from the device substrate 100. The second gate 223 may be insulated from the device substrate 100. For example, a portion of the second well region 102w that serves as the second channel region may have a conductivity corresponding to the voltage applied to the second gate 223.

[0075] The second gate 223 may include the same material as the first gate. The second gate 223 may be disposed on the same layer as the first gate. The second gate 223 may be formed by the same process as the first gate. For example, the second gate 223 may be formed simultaneously with the first gate.

[0076] The second drain 225 may be disposed on the device substrate 100. The second drain 225 may include a conductive material. For example, the second drain 225 may include a metal such as aluminum (Al), chromium (Cr), copper (Cu), molybdenum (Mo), titanium (Ti), and tungsten (W), but is not limited thereto. The second drain 225 may include a different material from the second gate 223. The second drain 225 may be disposed on a different layer from the second gate 223. The second drain 225 may be spaced apart from the device substrate 100. The second drain 225 may be electrically connected to the second drain region 102d. The second source 227 may be electrically connected to the second source region 102s. The second drain 225 may be insulated from the second gate 223. The interlayer insulating layer 120 may cover the second gate 223 of each sub-pixel SP. For example, the second drain 225 may be insulated from the second gate 223 by the interlayer insulating layer 120.

[0077] The second drain 225 may include the same material as the first drain. The second drain 225 may be disposed on the same layer as the first drain. The second drain 225 may be formed by the same process as the first drain. For example, the second drain 225 may be formed simultaneously with the first drain.

[0078] The second source electrode 227 may be disposed on the device substrate 100. 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), without limitation. The second source electrode 227 may include a material different from that of the second gate electrode 223. The second source electrode 227 may be disposed on a layer different from that of the second gate electrode 223. The second source electrode 227 may be spaced apart from 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 be insulated from the second gate electrode 223. The interlayer insulating layer 120 may cover the second gate electrode 223 of each sub-pixel SP. For example, the second source electrode 227 may be insulated from the second gate electrode 223 through the interlayer insulating layer 120.

[0079] The second source electrode 227 may be disposed on the same layer as 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. The second source electrode 227 may be spaced apart from the second drain electrode 225.

[0080] The storage capacitor Cst of each sub-pixel SP can hold the signal applied to the second gate 223 of the corresponding sub-pixel SP for one frame. For example, the storage capacitor Cst of each sub-pixel SP can be electrically connected between the second gate 223 and the second source 227 of the corresponding sub-pixel SP. The storage capacitor Cst of each sub-pixel SP can have a stacked structure of capacitor electrodes. For example, the storage capacitor Cst of each sub-pixel SP can include a first capacitor electrode electrically connected to the second gate 223 of the corresponding sub-pixel SP and a second capacitor electrode electrically connected to the second source 227 of the corresponding sub-pixel SP. The storage capacitor Cst of each sub-pixel SP can be formed by using the process of forming the first thin film transistor TR1 and the second thin film transistor TR2 in the corresponding sub-pixel SP. For example, the first capacitor electrode of each sub-pixel SP can be formed on the same layer as the second gate 223 of the corresponding sub-pixel SP, and the second capacitor electrode of each sub-pixel SP can be formed on the same layer as the second source 227 of the corresponding sub-pixel SP. The first capacitor electrode of each sub-pixel SP can include the same material as the second gate 223 of the corresponding sub-pixel SP, and the second capacitor electrode of each sub-pixel SP can include the same material as the second source 227 of the corresponding sub-pixel SP. The first capacitor electrode of each sub-pixel SP can be formed by the same process as the second gate 223 of the corresponding sub-pixel SP, and the second capacitor electrode of each sub-pixel SP can be formed by the same process as the second source 227 of the corresponding sub-pixel SP. For example, the first capacitor electrode of each sub-pixel SP can be formed simultaneously with the second gate 223 of the corresponding sub-pixel SP, and the second capacitor electrode of each sub-pixel SP can be formed simultaneously with the second source 227 of the corresponding sub-pixel SP. Therefore, in the display device according to the exemplary embodiment of the present disclosure, the process efficiency can be improved.

[0081] A plurality of insulating layers 110, 120, 130, and 140 for preventing unnecessary electrical connections can be provided on the device substrate 100. For example, a gate insulating layer 110, an interlayer insulating layer 120, a planarization layer 130, and a dam 140 can be provided on the device substrate 100, but are not limited thereto.

[0082] The gate insulating layer 110 may be disposed on the device substrate 100. The first gate and the second gate 223 of each sub-pixel SP may be insulated from the device substrate 100 through the gate insulating layer 110. For example, the upper surface of the device substrate 100 facing the first gate and the second gate 223 of each sub-pixel SP may be covered by the gate insulating layer 110. The gate insulating layer 110 may be in direct contact with the upper surface of the device substrate 100. For example, the first well region, the first drain region, the first source region, the second well region 102w, the second drain region 102d, and the second source region 102s of each sub-pixel SP may be covered by the gate insulating layer 110. The first gate and the second gate 223 of each sub-pixel 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), silicon nitride (SiNx), aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, aluminum oxide, or titanium oxide, etc., but not limited thereto.

[0083] The interlayer insulating layer 120 may be disposed on the gate insulating layer 110. The first gate of each sub-pixel SP may be insulated from the first drain and the first source of the corresponding sub-pixel SP, and the second gate 223 of each sub-pixel SP may be insulated from the second drain 225 and the second source 227 of the corresponding sub-pixel SP. For example, the interlayer insulating layer 120 may cover the first gate and the second gate 223 of each sub-pixel SP. More specifically, the interlayer insulating layer 120 may be configured to cover the first gate and the second gate 223 of each sub-pixel SP and the gate insulating layer 110. The first drain, the first source, the second drain 225, and the second source 227 of each sub-pixel SP 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 include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, aluminum oxide, or titanium oxide, etc.

[0084] The planarization layer 130 may be disposed on the interlayer insulating layer 120. The planarization layer 130 may be configured to protect the pixel driving circuit DC of each sub-pixel SP and remove the thickness difference caused by the pixel driving circuit DC of each sub-pixel SP. For example, the first drain, the first source, the second drain 225, and the second source 227 of each sub-pixel SP may be covered by the planarization layer 130. The upper surface of the planarization layer 130 facing the device substrate 100 may be a flat surface. For example, the upper surface of the planarization layer 130 may be parallel to the upper surface of the device substrate 100. The planarization layer 130 may include an insulating material. The planarization layer 130 may include a material different from that of the interlayer insulating layer 120. The planarization layer 130 may include a material having high fluidity. For example, the planarization layer 130 may include an organic insulating material.

[0085] The light-emitting device 300 of each sub-pixel SP may be disposed on the planarization layer 130. For example, the first electrode 310, the light-emitting unit 320, and the second electrode 330 of each sub-pixel SP may be sequentially stacked on the planarization layer 130 of the corresponding sub-pixel SP. The first electrode 310 of each sub-pixel SP may be electrically connected to the driving circuit DC of the corresponding sub-pixel SP. For example, the first electrode 310 of each sub-pixel SP may directly contact the second source 227 of the corresponding sub-pixel SP by penetrating the planarization layer 130. The first electrode 310 of each sub-pixel SP may include a portion directly contacting the upper surface of the planarization layer 130. The light-emitting unit 320 and the second electrode 330 of each sub-pixel SP may be stacked on the portion of the corresponding first electrode 310 directly contacting the upper surface of the planarization layer 130. Accordingly, in the display device according to the exemplary embodiment of the present disclosure, luminance deviation caused by the light generation position of the light-emitting device 300 of each sub-pixel SP may be prevented.

[0086] The dam 140 may be disposed on the planarization layer 130. More specifically, the dam 140 may be configured to cover the first electrode 310 and the planarization layer 130 in each sub-pixel SP. The dam 140 may define light-emitting regions R-EA, G-EA, and B-EA in each sub-pixel SP. The edge of the first electrode 310 in each sub-pixel SP may be covered by the dam 140. For example, a portion of the first electrode 310 exposed by the dam 140 in each sub-pixel SP may be the light-emitting regions R-EA, G-EA, and B-EA in the corresponding sub-pixel SP. The light-emitting unit 320 and the second electrode 330 of each sub-pixel SP may be stacked on the portion of the corresponding first electrode 310 exposed by the dam 140. The portion of the first electrode 310 disposed in the light-emitting regions R-EA, G-EA, and B-EA in each sub-pixel SP may be in direct contact with the upper surface of the planarization layer 130. The dam 140 may include an insulating material. For example, the dam 140 may include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, aluminum oxide, or titanium oxide. Alternatively, the dam 140 may include an organic insulating material such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, and / or polyimide resin. Each dam 140 may be a linear insulating layer having a constant thickness. The first electrode 310 of each sub-pixel SP may be insulated from the first electrode 310 of an adjacent sub-pixel SP by the dam 140.

[0087] The light emitted from the light-emitting device 300 of each sub-pixel SP may display the same color as the light emitted from the light-emitting device 300 of an adjacent sub-pixel SP. For example, the light emitted from the light-emitting device 300 of each sub-pixel SP may be white light. The light-emitting unit 320 of each sub-pixel SP may have the same stacked structure as the light-emitting unit 320 of an adjacent sub-pixel SP. The first light-emitting stack 321, the charge generation layer 322, and the second light-emitting stack 323 of each sub-pixel 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 an adjacent sub-pixel SP. For example, the first light-emitting stack 321, the charge generation layer 322, and the second light-emitting stack 323 of each sub-pixel SP may be formed simultaneously with the first light-emitting stack 321, the charge generation layer 322, and the second light-emitting stack 323 of an adjacent sub-pixel SP, respectively.

[0088] The region disposed between the light-emitting regions R-EA, G-EA, and B-EA may be defined as a non-light-emitting region NEA. For example, the dam 140 of each pixel region PA may be disposed on the non-light-emitting region NEA of the corresponding pixel region PA. The separation trench ST may be disposed within the non-light-emitting region NEA. The separation trench ST may extend along between adjacent light-emitting regions R-EA, G-EA, and B-EA. For example, each of the light-emitting regions R-EA, G-EA, and B-EA may be surrounded by the separation trench ST. The separation trench ST may be spaced apart from the dam 140. Each dam 140 may be disposed outside the separation trench ST. For example, the separation trench ST may be disposed between adjacent dams 140. The horizontal width of the separation trench ST may be less than the horizontal width of the non-light-emitting region NEA, but is not limited thereto.

[0089] The separation trench ST may extend in the direction of the device substrate 100. For example, a part of the separation trench ST may be surrounded by the planarization layer 130. The separation trench ST may have a groove shape in which a part of the planarization layer 130 is removed. The charge generation layer 322 of each sub-pixel SP may be separated from the charge generation layer 322 of an adjacent sub-pixel SP. The first light-emitting stack 321 of each sub-pixel SP may be separated from the first light-emitting stack 321 of an adjacent sub-pixel SP. For example, an air gap AR may be formed within the separation trench ST. Accordingly, in the display device according to an exemplary embodiment of the present disclosure, the light-emitting device 300 disposed in each sub-pixel SP may be prevented from malfunctioning due to leakage current. Also, in the display device according to an exemplary embodiment of the present disclosure, the density of the light-emitting device 300 may be increased. Accordingly, in the display device according to an exemplary embodiment of the present disclosure, the resolution of an image may be improved.

[0090] The voltage applied to the second electrode 330 of each sub-pixel SP may be the same as the voltage applied to the second electrode 330 of an adjacent sub-pixel SP. For example, the second electrode 330 of each sub-pixel SP may be electrically connected to the second electrode 330 of an adjacent sub-pixel SP. The second electrode 330 of each sub-pixel SP may include the same material as the second electrode 330 of an adjacent sub-pixel SP. The second electrode 330 of each sub-pixel SP may be formed by the same process as the second electrode 330 of an adjacent sub-pixel SP. For example, the second electrode 330 of each sub-pixel SP may be formed simultaneously with the second electrode 330 of an adjacent sub-pixel SP. The second electrode 330 of each sub-pixel SP may be in direct contact with the second electrode 330 of an adjacent sub-pixel SP. For example, the second electrode 330 may include a region overlapping the separation trench ST. Accordingly, in a display device according to an exemplary embodiment of the present disclosure, the process of forming the second electrode 330 in each sub-pixel SP may be simplified. The luminance of light emitted from the light-emitting device 300 of each sub-pixel SP may be adjusted by a data signal applied to the driving circuit DC of the corresponding sub-pixel SP.

[0091] The encapsulation structure 400 may be disposed on the light-emitting device 300 of each sub-pixel SP. The encapsulation structure 400 may prevent damage to the light-emitting device 300 due to external moisture and impact. Accordingly, in a display device according to an exemplary embodiment of the present disclosure, penetration of external moisture and oxygen may be effectively blocked or at least reduced. The encapsulation structure 400 may have a multi-layer structure. For example, the encapsulation structure 400 may include a first encapsulation layer 410, a second encapsulation layer 420, and a third encapsulation layer 430 stacked in sequence, but is not limited thereto. The first encapsulation layer 410, the second encapsulation layer 420, and the third encapsulation layer 430 may include an insulating material. The second encapsulation layer 420 may include a material different from that of the first encapsulation layer 410 and the third encapsulation layer 430. For example, the first encapsulation layer 410 and the third encapsulation layer 430 may be inorganic encapsulation layers including inorganic insulating materials such as silicon oxide (SiOx), silicon nitride (SiNx), aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, aluminum oxide, or titanium oxide, and the second encapsulation layer 420 may be an organic encapsulation layer including an organic insulating material. The thickness difference caused by the light-emitting device 300 of each sub-pixel SP may be removed by the second encapsulation layer 420. For example, the upper surface of the encapsulation structure 400 opposite to the device substrate 100 may be a flat surface. The upper surface of the encapsulation structure 400 may be parallel to the upper surface of the device substrate 100. Accordingly, in a display device according to an exemplary embodiment of the present disclosure, damage to the light-emitting device 300 in each sub-pixel SP due to external moisture and impact may be effectively prevented.

[0092] Sub-pixels SP in each pixel region PA can implement different colors. Each of the pixel regions PA may include a first sub-pixel that implements a first color, a second sub-pixel that implements a second color, and a third sub-pixel that implements a third color. For example, each pixel region PA may include a red sub-pixel that implements red, a green sub-pixel that implements green, and a blue sub-pixel that implements blue, but is not limited thereto. The dam 140 of each pixel region PA may define a red light-emitting region R-EA in the red sub-pixel, a green light-emitting region G-EA in the green sub-pixel, and a blue light-emitting region B-EA in the blue sub-pixel. Color filters 500R, 500G, and 500B for implementing the colors of the light-emitting regions R-EA, G-EA, and B-EA in each pixel region PA may be disposed on the light-emitting regions R-EA, G-EA, and B-EA of the sub-pixels SP in the corresponding pixel region PA. The color filters 500R, 500G, and 500B of each sub-pixel SP may overlap with the light-emitting regions R-EA, G-EA, and B-EA of the corresponding sub-pixel SP. For example, a red color filter 500R that overlaps with the red light-emitting region R-EA, a green color filter 500G that overlaps with the green light-emitting region G-EA, and a blue color filter 500B that overlaps with the blue light-emitting region B-EA may be disposed on each pixel region PA. The color filters 500R, 500G, and 500B of each light-emitting region R-EA, G-EA, and B-EA may have a larger size than the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, the boundary between adjacent color filters 500R, 500G, and 500B may overlap with the separation trench ST. Therefore, in the display device according to an exemplary embodiment of the present disclosure, the light emitted from the light-emitting device 300 of each sub-pixel PA must pass through one of the color filters 500R, 500G, and 500B in the corresponding pixel region PA. Therefore, in the display device according to an exemplary embodiment of the present disclosure, light leakage can be prevented.

[0093] The barrier member 610 and the lens structure 620 may be disposed between the encapsulation structure 400 and the color filters 500R, 500G, and 500B. The barrier member 610 may be disposed on the non-emitting area NEA. The barrier member 610 may be disposed outside the light-emitting areas R-EA, G-EA, and B-EA. For example, the barrier member 610 may overlap with the separation trench ST. The barrier member 610 may extend between the light-emitting areas R-EA, G-EA, and B-EA. For example, the pixel areas PA may be arranged side by side in a first direction and a second direction perpendicular to the first direction. The light-emitting areas R-EA, G-EA, and B-EA of each pixel area PA may be arranged side by side in the second direction, and the barrier member 610 may include a first barrier area 611 extending in the first direction and a second barrier area 612 extending in the second direction. The second barrier area 612 may be in direct contact with the first barrier area 611. For example, the plane of the barrier member 610 may have a grid shape, and the light-emitting areas R-EA, G-EA, and B-EA may be arranged in a matrix form within the area defined by the barrier member 610. Each light-emitting area R-EA, G-EA, and B-EA in each sub-pixel SP may be surrounded by the barrier member 610.

[0094] Each of the light-emitting areas R-EA, G-EA, and B-EA in each pixel area PA may display the same color as the light-emitting areas R-EA, G-EA, and B-EA of the adjacent pixel area PA in the first direction. For example, the color filters 500R, 500G, and 500B of each pixel area PA may be arranged in the same order as the color filters 500R, 500G, and 500B of the adjacent pixel area PA in the second direction. Each of the light-emitting areas R-EA, G-EA, and B-EA in each pixel area PA may include the same material as the light-emitting areas R-EA, G-EA, and B-EA of the adjacent pixel area PA in the first direction.

[0095] The barrier member 610 may include a material having a high reflectivity. For example, the barrier member 610 may include a metal. The barrier member 610 may be in direct contact with the encapsulation structure 400 and the color filters 500R, 500G, and 500B. For example, the thickness of the barrier member 610 may be the same as the vertical distance between the third encapsulation layer 430 and the color filters 500R, 500G, and 500B. The boundaries between the color filters 500R, 500G, and 500B may overlap the barrier member 610. That is, the barrier member 610 may be disposed on the non-light-emitting area NEA. Therefore, in the display device according to an exemplary embodiment of the present disclosure, the light emitted from the light-emitting devices 300 in each of the light-emitting areas R-EA, G-EA, and B-EA to the color filters 500R, 500G, and 500B in the adjacent light-emitting areas R-EA, G-EA, and B-EA may be reflected by the barrier member 610 toward the inside of the corresponding light-emitting areas R-EA, G-EA, and B-EA. Specifically, the barrier member 610 may contain carbon black, but is not limited thereto. Therefore, in the display device according to an exemplary embodiment of the present disclosure, color mixing can be prevented. Also, in the display device according to an exemplary embodiment of the present disclosure, the light extraction efficiency of each of the light-emitting areas R-EA, G-EA, and B-EA can be improved. That is, in the display device according to an exemplary embodiment of the present disclosure, the brightness of each of the light-emitting areas R-EA, G-EA, and B-EA can be increased.

[0096] The lens structure 620 may be disposed on the light-emitting areas R-EA, G-EA, and B-EA. For example, each lens structure 620 may overlap one of the light-emitting areas R-EA, G-EA, and B-EA. The space between the encapsulation structure 400 and the color filters 500R, 500G, and 500B may be completely filled with the barrier member 610 and the lens structure 620. For example, the side portions of each lens structure 620 may be in direct contact with the barrier member 610. Each lens structure 620 may have a structure in which at least three layers are stacked. For example, each lens structure 620 may have a stacked structure of a first lens insulating layer 621, a second lens insulating layer 622, and a lens passivation layer 623. For example, each of the lens structures 620 may include a first lens insulating layer 621, a second lens insulating layer 622, and a lens passivation layer 623 stacked in sequence on the encapsulation structure 400.

[0097] The first lens insulating layer 621 may be disposed close to the package structure 400. The first lens insulating layer 621 may be in direct contact with the upper surface of the package structure 400. For example, the lower surface of the first lens insulating layer 621 facing the device substrate 100 may be in direct contact with the upper surface of the third encapsulation layer 430 of the package structure 400. The first lens insulating layer 621 may include an insulating material. The first lens insulating layer 621 may include a transparent material. The first lens insulating layer 621 may be formed by a coating process. For example, the first lens insulating layer 621 may include an organic insulating material.

[0098] The upper surface of the first lens insulating layer 621 facing the color filters 500R, 500G, and 500B may have a concave shape facing the device substrate 100. The thickness of the first lens insulating layer 621 disposed in each light-emitting region R-EA, G-EA, and B-EA may gradually increase from the central region of the corresponding light-emitting region R-EA, G-EA, and B-EA toward the barrier 610. The second thickness of the first lens insulating layer 621 at the barrier 610 may be greater than the first thickness of the first lens insulating layer 621 at the central region of each light-emitting region R-EA, G-EA, and B-EA. Here, the vertical distance between the device substrate 100 and the upper surface of the first lens insulating layer 621 disposed in each light-emitting region R-EA, G-EA, and B-EA may gradually increase from the central region of the corresponding light-emitting region R-EA, G-EA, and B-EA toward the barrier 610. That is, in the display device according to the exemplary embodiment of the present disclosure, the upper surface of the first lens insulating layer 621 formed on each light-emitting region R-EA, G-EA, and B-EA may have a concave shape facing the device substrate 100. For example, the second vertical distance at the barrier 610 may be greater than the first vertical distance at the center of each light-emitting region R-EA, G-EA, and B-EA.

[0099] The second lens insulating layer 622 may be disposed on the upper surface of the first lens insulating layer 621. The second lens insulating layer 622 may be in direct contact with the first lens insulating layer 621. For example, the lower surface of the second lens insulating layer 622 facing the device substrate 100 may be in direct contact with the upper surface of the first lens insulating layer 621. The lower surface of the second lens insulating layer 622 may have the same shape as the upper surface of the first lens insulating layer 621. For example, the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 may have a convex shape facing the device substrate 100. The upper surface of the first lens insulating layer 621 may be completely covered by the lower surface of the second lens insulating layer 622. For example, the sides of the first lens insulating layer 621 and the sides of the second lens insulating layer 622 within each light-emitting region R-EA, G-EA, and B-EA may be in direct contact with the barrier 610.

[0100] The second lens insulating layer 622 may include an insulating material. The second lens insulating layer 622 may include a transparent material. The second lens insulating layer 622 may be formed by a coating process. For example, the second lens insulating layer 622 may include an organic insulating material. The refractive index of the second lens insulating layer 622 may be greater than that of the first lens insulating layer 621. For example, the second lens insulating layer 622 may include a material different from that of the first lens insulating layer 621. Thus, in the display device according to an exemplary embodiment of the present disclosure, the light passing through the first lens insulating layer 621 of each light-emitting region R-EA, G-EA, and B-EA may be refracted at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, the light passing through the first lens insulating layer 621 of each light-emitting region R-EA, G-EA, and B-EA may be refracted toward the central region of the corresponding light-emitting regions R-EA, G-EA, and B-EA at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. That is, in the display device according to an exemplary embodiment of the present disclosure, the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in each light-emitting region R-EA, G-EA, and B-EA may serve as a lens for condensing light. Thus, in the display device according to an exemplary embodiment of the present disclosure, the light emitted from the light-emitting devices 300 of each light-emitting region R-EA, G-EA, and B-EA may be first focused at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in the corresponding light-emitting regions R-EA, G-EA, and B-EA. That is, in the display device according to an exemplary embodiment of the present disclosure, the process efficiency may be improved.

[0101] The upper surface of the second lens insulating layer 622 may have the same shape as the upper surface of the first lens insulating layer 621. For example, the upper surface of the second lens insulating layer 622 facing the color filters 500R, 500G, and 500B may have a concave shape facing the device substrate 100. For example, the vertical distance between the device substrate 100 and the upper surface of the second lens insulating layer 622 in each light-emitting region R-EA, G-EA, and B-EA may gradually increase from the central region of the corresponding light-emitting regions R-EA, G-EA, and B-EA toward the barrier 610. For example, the upper surface of the second lens insulating layer 622 may have the same curvature as the upper surface of the first lens insulating layer 621.

[0102] The lens passivation layer 623 may be disposed on the upper surface of the second lens insulating layer 622. The lens passivation layer 623 may be in direct contact with the second lens insulating layer 622. For example, the lower surface of the lens passivation layer 623 facing the device substrate 100 may be in direct contact with the upper surface of the second lens insulating layer 622. The lower surface of the lens passivation layer 623 may have the same shape as the upper surface of the second lens insulating layer 622. For example, the boundary between the second lens insulating layer 622 and the lens passivation layer 623 may have a convex shape facing the device substrate 100. The upper surface of the second lens insulating layer 622 may be completely covered by the lower surface of the lens passivation layer 623. For example, the side portions of the lens passivation layer 623 in each of the light emitting regions R-EA, G-EA, and B-EA may be in direct contact with the barrier 610.

[0103] The refractive index of the lens passivation layer 623 may be greater than the refractive index of the second lens insulating layer 622. For example, the lens passivation layer 623 may include a material different from that of the second lens insulating layer 622. Thus, in the display device according to an exemplary embodiment of the present disclosure, the light passing through the second lens insulating layer 622 in each of the light emitting regions R-EA, G-EA, and B-EA may be refracted at the boundary between the second lens insulating layer 622 and the lens passivation layer 623 in the corresponding light emitting regions R-EA, G-EA, and B-EA. For example, the light passing through the second lens insulating layer 622 in each of the light emitting regions R-EA, G-EA, and B-EA may be refracted toward the central region of the corresponding light emitting regions R-EA, G-EA, and B-EA at the boundary between the second lens insulating layer 622 and the lens passivation layer 623 in the corresponding light emitting regions R-EA, G-EA, and B-EA. That is, in the display device according to an exemplary embodiment of the present disclosure, the boundary between the second lens insulating layer 622 and the lens passivation layer 623 in each of the light emitting regions R-EA, G-EA, and B-EA may function as a lens. In the display device according to an exemplary embodiment of the present disclosure, the light first converged at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in each of the light emitting regions R-EA, G-EA, and B-EA may be secondarily converged at the boundary between the second lens insulating layer 622 and the lens passivation layer 623 in the corresponding light emitting regions R-EA, G-EA, and B-EA. Thus, in the display device according to an exemplary embodiment of the present disclosure, the convergence efficiency of each of the light emitting regions R-EA, G-EA, and B-EA may be greatly improved through the lens structure 620 corresponding to the light emitting regions R-EA, G-EA, and B-EA.

[0104] The lens passivation layer 623 may include an insulating material. The lens passivation layer 623 may include a transparent material. The lens passivation layer 623 may include a material different from that of the second lens insulating layer 622. The lens passivation layer 623 may include a material harder than the second lens insulating layer 622. For example, the lens passivation layer 623 may include an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, aluminum oxide, or titanium oxide. Thus, in a display device according to an exemplary embodiment of the present disclosure, damage to the first lens insulating layer 621 and damage to the second lens insulating layer 622 due to external impact can be prevented by the lens passivation layer 623. For example, in a display device according to an exemplary embodiment of the present disclosure, the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 and the boundary between the second lens insulating layer 622 and the lens passivation layer 623 do not deform due to external impact. That is, in a display device according to an exemplary embodiment of the present disclosure, the light collection efficiency of the lens structure 620 in each of the light-emitting regions R-EA, G-EA, and B-EA does not change due to external impact. Thus, in a display device according to an exemplary embodiment of the present disclosure, a difference in light collection efficiency between the light-emitting regions R-EA, G-EA, and B-EA due to a shape difference in the lens structure 620 can be prevented. Also, in a display device according to an exemplary embodiment of the present disclosure, a luminance deviation due to a difference in light collection efficiency between the light-emitting regions R-EA, G-EA, and B-EA can be prevented.

[0105] The lens passivation layer 623 in each of the light-emitting regions R-EA, G-EA, and B-EA may be in direct contact with the color filters 500R, 500G, and 500B corresponding to the respective light-emitting regions R-EA, G-EA, and B-EA. For example, the upper surface of the lens passivation layer 623 in each of the light-emitting regions R-EA, G-EA, and B-EA may be in direct contact with the lower surface of the color filters 500R, 500G, and 500B in the respective light-emitting regions R-EA, G-EA, and B-EA. For example, the upper surface of the lens passivation layer 623 facing the color filters 500R, 500G, and 500B in each of the light-emitting regions R-EA, G-EA, and B-EA may be a flat surface. The upper surface of the lens passivation layer 623 in each of the light-emitting regions R-EA, G-EA, and B-EA may be parallel to the upper surface of the encapsulation structure 400.

[0106] The color filters 500R, 500G, and 500B of each light-emitting region R-EA, G-EA, and B-EA may have a refractive index less than that of the lens passivation layer 623 of the corresponding light-emitting region R-EA, G-EA, and B-EA. Thus, in the display device according to an exemplary embodiment of the present disclosure, the light passing through the lens structure 620 of each light-emitting region R-EA, G-EA, and B-EA may be diffused at the boundary between the lens passivation layer 623 and the color filters 500R, 500G, and 500B in the corresponding light-emitting region R-EA, G-EA, and B-EA. That is, in the display device according to an exemplary embodiment of the present disclosure, the viewing angle characteristics of each light-emitting region R-EA, G-EA, and B-EA may be adjusted by the refractive index difference between the lens passivation layer 623 and the color filters 500R, 500G, and 500B of the corresponding light-emitting region R-EA, G-EA, and B-EA. Thus, in the display device according to an exemplary embodiment of the present disclosure, the light extraction efficiency and the viewing angle characteristics of each light-emitting region R-EA, G-EA, and B-EA may be improved.

[0107] A filter passivation layer 700 may be disposed on the color filters 500R, 500G, and 500B of each pixel region PA. The filter passivation layer 700 may prevent damage to the color filters 500R, 500G, and 500B due to external shock and moisture. The filter passivation layer 700 may include an insulating material. For example, the filter passivation layer 700 may include at least one of an inorganic insulating material and an organic insulating material. The filter passivation layer 700 may have a multilayer structure. For example, the filter passivation layer 700 may have a structure in which an inorganic passivation layer made of an inorganic insulating material is formed on an organic passivation layer made of an organic insulating material. Thus, in the display device according to an exemplary embodiment of the present disclosure, damage to the color filters 500R, 500G, and 500B in each pixel region PA due to external shock and moisture may be effectively prevented.

[0108] Therefore, a display device according to an exemplary embodiment of the present disclosure may include a lens structure 620 disposed between color filters 500R, 500G, and 500B provided in each of the light-emitting regions R-EA, G-EA, and B-EA and the encapsulation structure 400, and a barrier 610 surrounding the lens structure 620, wherein sides of the lens structure 620 on each of the light-emitting regions R-EA, G-EA, and B-EA may be in direct contact with the barrier 610, wherein the lens structure 620 of each of the light-emitting regions R-EA, G-EA, and B-EA may include a first lens insulating layer 621, a second lens insulating layer 622, and a lens passivation layer 623 sequentially stacked on the encapsulation structure 400, wherein the second lens insulating layer 622 may have a refractive index greater than that of the first lens insulating layer 621, wherein the lens passivation layer 623 may have a refractive index greater than that of the second lens insulating layer 622, and wherein, in each of the light-emitting regions R-EA, G-EA, and B-EA, boundaries between the first lens insulating layer 621 and the second lens insulating layer 622 and boundaries between the second lens insulating layer 622 and the lens passivation layer 623 may have a convex shape toward the device substrate 100. Therefore, in a display device according to an exemplary embodiment of the present disclosure, light emitted from the light-emitting devices 300 in each of the light-emitting regions R-EA, G-EA, and B-EA may be first focused at a boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in the corresponding light-emitting regions R-EA, G-EA, and B-EA, and may be secondarily focused at a boundary between the second lens insulating layer 622 and the lens passivation layer 623 in the corresponding light-emitting regions R-EA, G-EA, and B-EA. Also, in a display device according to an exemplary embodiment of the present disclosure, light emitted from the light-emitting devices 300 in each of the light-emitting regions R-EA, G-EA, and B-EA toward the color filters 500R, 500G, and 500B of adjacent light-emitting regions R-EA, G-EA, and B-EA may be reflected by the barrier 610 toward a central region of the corresponding light-emitting regions R-EA, G-EA, and B-EA. Therefore, in a display device according to an exemplary embodiment of the present disclosure, the focusing efficiency and the light extraction efficiency of each of the light-emitting regions R-EA, G-EA, and B-EA may be improved. Also, in a display device according to an exemplary embodiment of the present disclosure, luminance deviation caused by differences in the focusing efficiency of the light-emitting regions R-EA, G-EA, and B-EA may be prevented. Accordingly, in a display device according to an exemplary embodiment of the present disclosure, the quality of an image may be improved.

[0109] Figures 6 to 8 are views sequentially showing a method of forming a display device according to an exemplary embodiment of the present disclosure.

[0110] will be referred to Figures 4 to 8A method of forming a display device according to an exemplary embodiment of the present disclosure is described. First, as Figure 6 shown, a method of forming a display device according to an exemplary embodiment of the present disclosure may include steps of forming a gate insulating layer 110, an interlayer insulating layer 120, a planarization layer 130, a dam 140, a partition trench ST, a driving circuit including a second thin film transistor TR2, a light emitting device 300, and a package structure 400 on a device substrate 100, and forming a barrier 610 on the package structure 400 in a non-light emitting area NEA. For example, the light emitting device 300 of each sub-pixel SP may include a first electrode 310, a light emitting unit 320, and a second electrode 330 stacked in sequence, but is not limited thereto.

[0111] Each light emitting device 300 may be formed to overlap one of the light emitting areas R-EA, G-EA, and B-EA defined by the non-light emitting area NEA. The dam 140 and the partition trench ST may be formed to overlap the non-light emitting area NEA. For example, the barrier 610 may be formed to overlap the partition trench ST. The dam 140 may be formed outside the partition trench ST.

[0112] The barrier 610 may be formed outside the light emitting areas R-EA, G-EA, and B-EA. For example, the upper surface of the package structure 400 on each of the light emitting areas R-EA, G-EA, and B-EA may be exposed through the barrier 610. The barrier 610 may be formed of a material having a relatively high reflectivity. For example, the barrier 610 may be formed of a metal.

[0113] As Figure 7 shown, a method of forming a display device according to an exemplary embodiment of the present disclosure may include a step of forming a first preliminary insulating layer 621a on the package structure 400 in each of the light emitting areas R-EA, G-EA, and B-EA.

[0114] The first preliminary insulating layer 621a may be formed of an insulating material. The first preliminary insulating layer 621a may be formed of a transparent material. For example, the first preliminary insulating layer 621a may be formed of an organic insulating material. The step of forming the first preliminary insulating layer 621a in each of the light emitting areas R-EA, G-EA, and B-EA may include a coating process. For example, the step of forming the first preliminary insulating layer 621a in each of the light emitting areas R-EA, G-EA, and B-EA may include a step of spraying an organic insulating material on the package structure 400 exposed through the barrier 610 using a nozzle of an inkjet device. The upper surface of the first preliminary insulating layer 621a formed in each of the light emitting areas R-EA, G-EA, and B-EA opposite to the package structure 400 may have a convex curved shape in a direction opposite to the device substrate 100.

[0115] The encapsulation structure 400 of each light-emitting region R-EA, G-EA, and B-EA exposed through the barrier 610 may be completely covered by the first preliminary insulating layer 621a formed on the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, the sides of the preliminary insulating layer 621a formed on each light-emitting region R-EA, G-EA, and B-EA may be in direct contact with the barrier 610.

[0116] As Figure 8 shown, a method of forming a display device according to an exemplary embodiment of the present disclosure may include the step of forming a first lens insulating layer 621 for each of the light-emitting regions R-EA, G-EA, and B-EA.

[0117] The step of forming the first lens insulating layer 621 for each of the light-emitting regions R-EA, G-EA, and B-EA may include the step of curing the first preliminary insulating layer 621a for each of the light-emitting regions R-EA, G-EA, and B-EA. The step of curing the first preliminary insulating layer 621a for each of the light-emitting regions R-EA, G-EA, and B-EA may include a drying process. Thus, in the display device according to an exemplary embodiment of the present disclosure, the volume of the first preliminary insulating layer 621a on each of the light-emitting regions R-EA, G-EA, and B-EA may be reduced by evaporation of the solvent. The volume reduced at the edge of the first preliminary insulating layer 621a in direct contact with the barrier 610 may be less than the volume reduced at the central region of the first preliminary insulating layer 621a spaced apart from the barrier 610 during the drying process. Accordingly, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the thickness of the first lens insulating layer 621 formed on each of the light-emitting regions R-EA, G-EA, and B-EA may gradually increase from the central region of the corresponding light-emitting regions R-EA, G-EA, and B-EA toward the barrier 610. For example, the vertical distance between the device substrate 100 and the upper surface of the first lens insulating layer 621 provided in each of the light-emitting regions R-EA, G-EA, and B-EA may gradually increase from the central region of the corresponding light-emitting regions R-EA, G-EA, and B-EA toward the barrier 610. That is, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the upper surface of the first lens insulating layer 621 formed on each of the light-emitting regions R-EA, G-EA, and B-EA may have a concave shape toward the device substrate 100.

[0118] As Figure 4 and Figure 5As shown, a method of forming a display device according to an exemplary embodiment of the present disclosure may include: forming a second lens insulating layer 622 on a first lens insulating layer 621 in each of the light-emitting regions R-EA, G-EA, and B-EA; forming a lens passivation layer 623 on the second lens insulating layer 622 in each of the light-emitting regions R-EA, G-EA, and B-EA; forming color filters 500R, 500G, and 500B on a device substrate 100 in which the lens passivation layer 623 of each of the light-emitting regions R-EA, G-EA, and B-EA is formed; and forming a filter passivation layer 700 on the color filters 500R, 500G, and 500B.

[0119] The second lens insulating layer 622 in each of the light-emitting regions R-EA, G-EA, and B-EA may be formed by the same process as the first lens insulating layer 621 in each of the light-emitting regions R-EA, G-EA, and B-EA. For example, the step of forming the second lens insulating layer 622 in each of the light-emitting regions R-EA, G-EA, and B-EA may include forming a second preliminary insulating layer on the first lens insulating layer 621 in each of the light-emitting regions R-EA, G-EA, and B-EA, and curing the second preliminary insulating layer in each of the light-emitting regions R-EA, G-EA, and B-EA. The step of forming the second preliminary insulating layer in each of the light-emitting regions R-EA, G-EA, and B-EA may include a coating process. The step of curing the second preliminary insulating layer in each of the light-emitting regions R-EA, G-EA, and B-EA may include a drying process. Accordingly, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in each of the light-emitting regions R-EA, G-EA, and B-EA may be formed to have the same shape as the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in adjacent light-emitting regions R-EA, G-EA, and B-EA.

[0120] The second preliminary insulating layer may be formed of an insulating material. The second preliminary insulating layer may be formed of a transparent material. For example, the second preliminary insulating layer may be formed of an organic insulating material. The second preliminary insulating layer may be formed of a material having a refractive index greater than that of the first preliminary insulating layer 621a. For example, the second preliminary insulating layer may be formed of a material different from the first preliminary insulating layer 621a. Accordingly, in the method of forming a display device according to an exemplary embodiment of the present disclosure, due to the difference in refractive index between the first lens insulating layer 621 and the second lens insulating layer 622 on the corresponding light-emitting regions R-EA, G-EA, and B-EA, the light passing through the first lens insulating layer 621 of each of the light-emitting regions R-EA, G-EA, and B-EA may be refracted at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 on each of the light-emitting regions R-EA, G-EA, and B-EA may serve as a lens for concentrating light. Accordingly, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the light emitted from the light-emitting devices 300 of each of the light-emitting regions R-EA, G-EA, and B-EA may be mainly concentrated at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 in the corresponding light-emitting regions R-EA, G-EA, and B-EA. That is, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the process efficiency may be improved.

[0121] The vertical distance between the upper surface of the second lens insulating layer 622 on each of the light-emitting regions R-EA, G-EA, and B-EA, which faces the encapsulation structure 400, and the device substrate 100 may gradually increase from the central region of the corresponding light-emitting regions R-EA, G-EA, and B-EA toward the barrier 610. For example, the upper surface of the second lens insulating layer 622 formed on each of the light-emitting regions R-EA, G-EA, and B-EA may have a concave shape facing the device substrate 100. The upper surface of the second lens insulating layer 622 on each of the light-emitting regions R-EA, G-EA, and B-EA may be formed to have the same shape as the upper surface of the first lens insulating layer 621 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, the upper surface of the second lens insulating layer 622 on each of the light-emitting regions R-EA, G-EA, and B-EA may have the same curvature as the upper surface of the first lens insulating layer 621 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. The upper surface of the second lens insulating layer 622 on each of the light-emitting regions R-EA, G-EA, and B-EA may be formed to have the same shape as the upper surface of the second lens insulating layer 622 on the adjacent light-emitting regions R-EA, G-EA, and B-EA.

[0122] The lens passivation layer 623 of each of the light-emitting regions R-EA, G-EA, and B-EA may be formed of an insulating material. The lens passivation layer 623 of each of the light-emitting regions R-EA, G-EA, and B-EA may be formed of a transparent material. The lens passivation layer 623 of each of the light-emitting regions R-EA, G-EA, and B-EA may be formed of a material having a refractive index greater than that of the second preliminary insulating layer. Thus, in the method of forming a display device according to an exemplary embodiment of the present disclosure, due to the difference in refractive index between the second lens insulating layer 622 and the lens passivation layer 623 on the corresponding light-emitting regions R-EA, G-EA, and B-EA, the light passing through the second lens insulating layer 622 of each of the light-emitting regions R-EA, G-EA, and B-EA may be refracted at the boundary between the second lens insulating layer 622 and the lens passivation layer 623 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the boundary between the second lens insulating layer 622 and the lens passivation layer 623 on each of the light-emitting regions R-EA, G-EA, and B-EA may serve as a lens for focusing light. That is, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the light emitted from the light-emitting device 300 of each of the light-emitting regions R-EA, G-EA, and B-EA may be first focused at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 on the corresponding light-emitting regions R-EA, G-EA, and B-EA, and may be secondarily focused at the boundary between the second lens insulating layer 622 and the lens passivation layer 623 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. Thus, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the focusing efficiency of each of the light-emitting regions R-EA, G-EA, and B-EA may be improved.

[0123] The first lens insulating layer 621, the second lens insulating layer 622, and the lens passivation layer 623 on each of the light-emitting regions R-EA, G-EA, and B-EA may constitute a lens structure 620 provided on the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, the side portions of the lens structure 620 on each of the light-emitting regions R-EA, G-EA, and B-EA may be in direct contact with the barrier member 610. The lens passivation layer 623 of each of the light-emitting regions R-EA, G-EA, and B-EA may be formed of a material different from that of the second lens insulating layer 622 of the corresponding light-emitting regions R-EA, G-EA, and B-EA. The lens passivation layer 623 of each of the light-emitting regions R-EA, G-EA, and B-EA may be formed of a material harder than the second lens insulating layer 622 of the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, the lens passivation layer 623 of each of the light-emitting regions R-EA, G-EA, and B-EA may be formed of an inorganic insulating material such as silicon oxide (SiOx), silicon nitride (SiNx), aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, aluminum oxide, or titanium oxide. Accordingly, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the boundaries between the first lens insulating layer 621 and the second lens insulating layer 622 and between the second lens insulating layer 622 and the lens passivation layer 623 on each of the light-emitting regions R-EA, G-EA, and B-EA do not deform due to external shock. That is, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the light-gathering efficiency of the lens structure 620 on each of the light-emitting regions R-EA, G-EA, and B-EA may remain the same. Accordingly, in the method of forming a display device according to an exemplary embodiment of the present disclosure, luminance deviation due to differences in the light-gathering efficiency of the light-emitting regions R-EA, G-EA, and B-EA may be prevented.

[0124] Therefore, a method of forming a display device according to an exemplary embodiment of the present disclosure may include forming a barrier 610 on a packaging structure 400, and forming a lens structure 620 on the packaging structure 400 of each light-emitting region R-EA, G-EA, and B-EA exposed by the barrier 610, wherein the lens structure 620 of each light-emitting region R-EA, G-EA, and B-EA may include at least two boundaries formed by a coating process and a curing process, and the boundaries within each lens structure 620 may be formed to have a concave shape toward the device substrate 100. Therefore, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the process of forming the lens structure 620 on each light-emitting region R-EA, G-EA, and B-EA may be simplified to converge the light emitted from the light-emitting devices 300 of the corresponding light-emitting regions R-EA, G-EA, and B-EA. Moreover, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the light emitted from the light-emitting devices 300 of each light-emitting region R-EA, G-EA, and B-EA toward the color filters 500R, 500G, and 500B of the adjacent light-emitting regions R-EA, G-EA, and B-EA may be reflected by the barrier 610 toward the central regions of the corresponding light-emitting regions R-EA, G-EA, and B-EA. Therefore, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the efficiency of converging the light emitted from each light-emitting device 300 may be improved without reducing the process efficiency. And, in the method of forming a display device according to an exemplary embodiment of the present disclosure, the uniformity of the lens structure 620 may be improved.

[0125] The display device according to an exemplary embodiment of the present disclosure describes that the driving circuit DC of each sub-pixel SP is composed of a first thin-film transistor TR1, a second thin-film transistor TR2, and a storage capacitor Cst. Figure 2The illustrated example represents a 2T1C structure in which two transistors and one capacitor are provided, but embodiments of the present disclosure are not limited thereto. However, in a display device according to another exemplary embodiment of the present disclosure, a driving circuit DC of each sub-pixel SP may include a driving thin film transistor and at least one switching thin film transistor. For example, in a display device according to another exemplary embodiment of the present disclosure, a driving circuit DC of each sub-pixel SP may further include a third thin film transistor for initializing a storage capacitor Cst of the corresponding sub-pixel SP according to a gate signal. The third thin film transistor of each sub-pixel SP may include a third well region, a third drain region, a third source region, a third gate, a third drain, and a third source. The third well region, the third drain region, and the third source region may be formed in a device substrate 100. The third gate of each sub-pixel SP may be electrically connected to a corresponding gate line GL, the third drain of each sub-pixel SP may be electrically connected to an initial line to which an initial signal is applied, and the third source of each sub-pixel SP may be electrically connected to a storage capacitor Cst of the corresponding sub-pixel SP. Accordingly, in a display device according to another exemplary embodiment of the present disclosure, the degree of freedom in the configuration of each driving circuit DC can be increased.

[0126] In a display device according to an exemplary embodiment of the present disclosure, the positions and electrical connections of a first drain, a first source, a second drain 225, and a second source 227 in each driving circuit DC may vary according to 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 exemplary embodiment of the present disclosure, a second gate 223 of each driving circuit DC may be electrically connected to a first drain of the corresponding driving circuit DC. Accordingly, in a display device according to another exemplary embodiment of the present disclosure, the degree of freedom in the configuration of each driving circuit DC and the types of the corresponding thin film transistors TR1 and TR2 can be increased.

[0127] A display device according to an exemplary embodiment of the present disclosure is described, in which a first well, a second drain region 102d, and a second source region 102s of each sub-pixel SP may include P-type impurities, and a first drain region, a first source region, and a second well region 102w of each sub-pixel SP may include N-type impurities. However, in a display device according to another exemplary embodiment of the present disclosure, the second well region 102w of each sub-pixel SP may include the same conductive impurities as the first well region of the corresponding sub-pixel SP. For example, in a display device according to another exemplary embodiment of the present disclosure, the first well region and the second well region 102w of each sub-pixel SP may include P-type impurities. The first drain region, the first source region, the second drain region 102d, and the second source region 102s of each sub-pixel SP may include N-type impurities. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the degree of freedom in configuring each driving circuit DC and the type of each thin film transistor TR1 and TR2 can be increased.

[0128] A display device according to an exemplary embodiment of the present disclosure is described, in which the device substrate 100 may be a wafer formed of a semiconductor material such as silicon. However, in a display device according to another exemplary embodiment of the present disclosure, the device substrate 100 may include glass or plastic or a flexible polymer film. For example, the flexible polymer film may be made of any one of polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyethersulfone (PES), cycloolefin copolymer (COC), triacetyl cellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and polystyrene (PS), which are merely examples and not necessarily limited thereto. In a display device according to another exemplary embodiment of the present disclosure, the driving circuit DC of each sub-pixel SP may be formed on the upper surface of the device substrate 100. For example, in a display device according to another embodiment of the present disclosure, a buffer layer including an inorganic insulating layer such as silicon oxide (SiOx), silicon nitride (SiNx), aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, aluminum oxide, or titanium oxide may be 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 a semiconductor pattern formed on the buffer 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 sub-pixel SP may include an oxide semiconductor such as IGZO. Therefore, in a display device according to another exemplary embodiment of 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.

[0129] A display device according to an exemplary embodiment of the present disclosure is described in which the first electrode 310 of each subpixel SP may have a relatively high reflectivity. However, in a display device according to another exemplary embodiment of the present disclosure, the first electrode 310 of each subpixel SP may be a transparent electrode having a high transmittance, and a reflective electrode may be disposed between the device substrate 100 and the first electrode 310 of each subpixel SP. For example, the first electrode 310 of each subpixel SP may be made of a transparent conductive material such as ITO and IZO. The distance between the first electrode 310 and the reflective electrode in each subpixel SP may be determined by the color achieved in the light-emitting regions R-EA, G-EA, and B-EA of the corresponding subpixel SP. For example, the distance between the reflective electrode and the first electrode 310 in the red light-emitting region R-EA may be different from the distance between the reflective electrode and the first electrode 310 in the green light-emitting region G-EA and the distance between the reflective electrode and the first electrode 310 in the blue light-emitting region B-EA. That is, in a display device according to another exemplary embodiment of the present disclosure, light having a wavelength range corresponding to the color achieved by each of the light-emitting regions R-EA, G-EA, and B-EA may resonate between the reflective electrode and the second electrode 330 in the corresponding light-emitting regions R-EA, G-EA, and B-EA. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the light-gathering efficiency and color gamut of each of the light-emitting regions R-EA, G-EA, and B-EA can be improved.

[0130] A display device according to an exemplary embodiment of the present disclosure is described in which the barrier 610 may include a material having a relatively high reflectivity. However, in a display device according to another exemplary embodiment of the present disclosure, due to the refractive index difference between the lens structure 620 of the corresponding light-emitting regions R-EA, G-EA, and B-EA and the barrier 610, light emitted from the light-emitting devices 300 of each of the light-emitting regions R-EA, G-EA, and B-EA to the color filters 500R, 500G, and 500B of the adjacent light-emitting regions R-EA, G-EA, and B-EA may be reflected. For example, in a display device according to another exemplary embodiment of the present disclosure, the barrier 610 may include a material having a refractive index smaller than that of the lens structure 620 of each of the light-emitting regions R-EA, G-EA, and B-EA. Therefore, the light-gathering efficiency and light extraction efficiency of each of the light-emitting regions R-EA, G-EA, and B-EA can be improved. The barrier 610 may include an insulating material. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the degree of freedom of the material of the barrier 610 and the process of forming the barrier 610 can be improved.

[0131] A display device according to an exemplary embodiment of the present disclosure, in which the color filters 500R, 500G, and 500B of each light-emitting region R-EA, G-EA, and B-EA may have a refractive index less than that of the lens passivation layer of the corresponding light-emitting regions R-EA, G-EA, and B-EA. However, in a display device according to another exemplary embodiment of the present disclosure, the color filters 500R, 500G, and 500B of each light-emitting region R-EA, G-EA, and B-EA may have a refractive index greater than that of the lens passivation layer of the corresponding light-emitting regions R-EA, G-EA, and B-EA. Accordingly, in a display device according to another exemplary embodiment of the present disclosure, an image with a narrow viewing angle may be achieved. For example, in a display device according to another exemplary embodiment of the present disclosure, an image provided to a user may not be recognized by people disposed around the user. Also, in a display device according to another embodiment of the present disclosure, light emitted from the light-emitting devices 300 of each light-emitting region R-EA, G-EA, and B-EA may be concentrated at the boundary between the first lens insulating layer 621 and the second lens insulating layer 622 on the corresponding light-emitting regions R-EA, G-EA, and B-EA, at the boundary between the second lens insulating layer 622 and the lens passivation layer 623 on the corresponding light-emitting regions R-EA, G-EA, and B-EA, and at the boundary between the lens passivation layer 623 and the color filters 500R, 500G, and 500B on the corresponding light-emitting regions R-EA, G-EA, and B-EA. Accordingly, in a display device according to another exemplary embodiment of the present disclosure, the concentration efficiency and front luminance of each light-emitting region R-EA, G-EA, and B-EA may be greatly improved.

[0132] A display device according to an exemplary embodiment of the present disclosure is described in which the lens structure 620 of each light-emitting region R-EA, G-EA, and B-EA may have a stacked structure of a first lens insulating layer 621, a second lens insulating layer 622, and a lens passivation layer 623. However, in a display device according to another exemplary embodiment of the present disclosure, the lens structure 620 of each light-emitting region R-EA, G-EA, and B-EA may include at least three lens insulating layers 621 and 622 provided between the encapsulation structure 400 corresponding to the light-emitting regions R-EA, G-EA, and B-EA and the lens passivation layer 623. For example, in a display device according to another exemplary embodiment of the present disclosure, at least three boundaries may be provided in the lens structure 620 of each light-emitting region R-EA, G-EA, and B-EA. Each boundary provided in each lens structure 620 may have a convex shape facing the device substrate 100. The lens insulating layers 621 and 622 provided between the encapsulation structure 400 and the lens passivation layer 623 of each light-emitting region R-EA, G-EA, and B-EA may have a refractive index that increases as they become farther from the encapsulation structure 400. The lens passivation layer 623 of each light-emitting region R-EA, G-EA, and B-EA may have a relatively larger refractive index than the lens insulating layers 621 and 622 of the corresponding light-emitting regions R-EA, G-EA, and B-EA. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the focusing efficiency of the lens structure 620 in each light-emitting region R-EA, G-EA, and B-EA can be effectively improved.

[0133] A display device according to an exemplary embodiment of the present disclosure is described in which the plane of the barrier 610 may have a grid pattern. However, in a display device according to another exemplary embodiment of the present disclosure, a part of the barrier 610 may be separated from other parts of the barrier 610. For example, in a display device according to another exemplary embodiment of the present disclosure, a second barrier region 612 extending in the second direction may be spaced apart from a first barrier region 611 extending in the first direction, as Figure 9 shown. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the lens structure 620 of each light-emitting region R-EA, G-EA, and B-EA may be in partial contact with the lens passivation layer 630 of an adjacent light-emitting region R-EA, G-EA, and B-EA. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the extensibility of the first preliminary insulating layer 621a deposited on each light-emitting region R-EA, G-EA, and B-EA and the extensibility of the second preliminary insulating layer can be improved. In a display device according to another exemplary embodiment of the present disclosure, the uniformity of the boundaries provided in the lens structure 620 of each light-emitting region R-EA, G-EA, and B-EA can be improved.

[0134] A display device according to an exemplary embodiment of the present disclosure is described in which the barrier member 610 may include a first barrier region 611 extending in a first direction and a second barrier region 612 extending in a second direction. However, in a display device according to another exemplary embodiment of the present disclosure, the barrier member 610 may extend only in a single direction. For example, in a display device according to another exemplary embodiment of the present disclosure, the barrier member 610 may be disposed only between the light-emitting regions R-EA, G-EA, and B-EA that display different colors, as Figure 10 shown. The barrier member 610 may not be disposed between the light-emitting regions R-EA, G-EA, and B-EA that display the same color. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the extensibility of the first preliminary insulating layer 621a and the second preliminary insulating layer deposited on each of the light-emitting regions R-EA, G-EA, and B-EA can be effectively improved. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the uniformity of the boundaries within the lens structures 620 provided in each of the light-emitting regions R-EA, G-EA, and B-EA can be effectively improved.

[0135] In a display device according to another exemplary embodiment of the present disclosure, the first preliminary insulating layer 621a and the second preliminary insulating layer deposited on each of the light-emitting regions R-EA, G-EA, and B-EA may have improved extensibility in the first direction and the second direction. For example, in a display device according to another exemplary embodiment of the present disclosure, the barrier member 610 may extend only in the first direction between the light-emitting regions R-EA, G-EA, and B-EA, and the barrier member 610 may include at least one slit (610s), as Figure 11 shown. The slit 610s may be disposed between the light-emitting regions R-EA, G-EA, and B-EA adjacent in the first direction. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the extensibility of the first preliminary insulating layer 621a and the second preliminary insulating layer deposited on each of the light-emitting regions R-EA, G-EA, and B-EA can be improved, and a reduction in the extraction efficiency of each of the light-emitting regions R-EA, G-EA, and B-EA due to the flow of the first preliminary insulating layer 621a and / or the flow of the second preliminary insulating layer can be prevented.

[0136] A display device according to an exemplary embodiment of the present disclosure is described in which the boundaries between adjacent color filters 500R, 500G, and 500B can overlap with the barrier 610. However, in a display device according to another exemplary embodiment of the present disclosure, the color filters 500R, 500G, and 500B of each light-emitting region R-EA, G-EA, and B-EA can be formed only on the lens passivation layer 623 in the corresponding light-emitting regions R-EA, G-EA, and B-EA. For example, in a display device according to another exemplary embodiment of the present disclosure, the barrier 610 can extend between the color filters 500R, 500G, and 500B, as Figure 12 shown. The upper end portion of the barrier 610 opposite to the device substrate 100 can be in direct contact with the filter passivation layer 700. The color filters 500R, 500G, and 500B of each light-emitting region R-EA, G-EA, and B-EA can be formed within the region defined by the barrier 610. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the degree of freedom in the materials of the color filters 500R, 500G, and 500B and the process of forming the color filters 500R, 500G, and 500B can be improved. Also, in a display device according to another exemplary embodiment of the present disclosure, color mixing can be effectively prevented.

[0137] A display device according to an exemplary embodiment of the present disclosure is described in which the boundary between the lens passivation layer 623 and the color filters 500R, 500G, and 500B on each light-emitting region R-EA, G-EA, and B-EA can be a flat surface. However, in a display device according to another embodiment of the present disclosure, the boundary between the lens passivation layer 623 and the color filters 500R, 500G, and 500B on each light-emitting region R-EA, G-EA, and B-EA can have various shapes. For example, in a display device according to another exemplary embodiment of the present disclosure, the boundary between the lens passivation layer 623 and the color filters 500R, 500G, and 500B on each light-emitting region R-EA, G-EA, and B-EA can have a convex shape toward the device substrate 100, as Figure 13As shown. The upper surface of the lens passivation layer 623 of each light-emitting region R-EA, G-EA, and B-EA corresponding to the color filters 500R, 500G, and 500B may have a concave shape facing the device substrate 100. For example, the upper surface of the lens passivation layer 623 on each light-emitting region R-EA, G-EA, and B-EA may have the same curvature as the upper surface of the second lens insulating layer 622 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. The upper surface of the lens passivation layer 623 on each light-emitting region R-EA, G-EA, and B-EA may have the same shape as the upper surface of the second lens insulating layer 622 on the corresponding light-emitting regions R-EA, G-EA, and B-EA. Therefore, in a display device according to another exemplary embodiment of the present disclosure, due to the boundaries between the lens passivation layer 623 and the color filters 500R, 500G, and 500B on each light-emitting region R-EA, G-EA, and B-EA, the light-gathering efficiency and viewing angle characteristics can be effectively improved.

[0138] The lens passivation layer 623 of each light-emitting region R-EA, G-EA, and B-EA may be in direct contact with the lens passivation layer 623 of an adjacent light-emitting region R-EA, G-EA, and B-EA. For example, the upper end portion of the barrier 610 facing the encapsulation structure 400 may be spaced apart from the color filters 500R, 500G, and 500B. The lens passivation layer 623 of each light-emitting region R-EA, G-EA, and B-EA may extend between the barrier 610 and the color filters 500R, 500G, and 500B. For example, the upper end portion of the barrier 610 may be covered by the lens passivation layer 623. Therefore, in a display device according to another exemplary embodiment of the present disclosure, damage to the color filters 500R, 500G, and 500B caused by the barrier 610 can be prevented. Also, in a display device according to another exemplary embodiment of the present disclosure, the upper surface of the lens passivation layer 623 having a curved shape on each light-emitting region R-EA, G-EA, and B-EA can be effectively formed. Therefore, in a display device according to another exemplary embodiment of the present disclosure, the light-gathering efficiency and brightness of each light-emitting region R-EA, G-A, and B-EA can be improved without a complicated process. In addition, in a display device according to another exemplary embodiment of the present disclosure, the lens passivation layer 623 can prevent damage to the first lens insulating layer 621 and the second lens insulating layer 622 caused by external impact.

[0139] Accordingly, a display device according to an embodiment of the present disclosure may include a lens structure disposed between a package structure covering a light-emitting device and a color filter, and a barrier member contacting a side portion of the lens structure, wherein the lens structure may have a structure in which at least three layers are stacked, wherein each layer of the lens structure may have a refractive index that increases as the distance from the package structure increases, and wherein a boundary between layers within the lens structure may have a convex shape toward the light-emitting device. Accordingly, in a display device according to an embodiment of the present disclosure, the light-gathering efficiency of light emitted from the light-emitting device can be improved without a complicated process. Also, in a display device according to an embodiment of the present disclosure, the uniformity of the lens structure can be improved. That is, in a display device according to an embodiment of the present disclosure, the light-gathering efficiency of each light-emitting region can be improved, and brightness deviation due to the light-gathering efficiency of the light-emitting region can be prevented. Accordingly, in a display device according to an embodiment of the present disclosure, the quality of an image can be improved. In addition, in a display device according to an embodiment of the present disclosure, low-power driving is possible, and power consumption can be reduced.

[0140] Cross-reference to related applications

[0141] This application claims the benefit and priority of Korean Patent Application No. 10-2023-0181770, filed on Dec. 14, 2023, the entire contents of which are hereby incorporated by reference for all purposes as if fully set forth herein.

Claims

1. A display device, comprising: A light emitting device, wherein the light emitting device is disposed on a light emitting region of a device substrate; A packaging structure, wherein the packaging structure is disposed on the device substrate and the packaging structure is on the light-emitting device; A lens structure, the lens structure comprising a first lens insulating layer, a second lens insulating layer and a lens passivation layer sequentially stacked on the encapsulation structure in the light emitting area; a barrier, the barrier being disposed on the packaging structure and contacting a side of the lens structure; as well as a color filter, the color filter being disposed on the lens structure and overlapping the light emitting area, wherein the second lens insulating layer has a greater refractive index than the first lens insulating layer, wherein the lens passivation layer has a greater refractive index than the second lens insulating layer, and The upper surface of the first lens insulating layer and the upper surface of the second lens insulating layer facing the color filter have a concave shape facing the device substrate.

2. The display device according to claim 1, wherein: An upper surface of the second lens insulating layer has the same curvature as an upper surface of the first lens insulating layer.

3. The display device according to claim 1, wherein: The barrier includes a material having a reflectivity greater than reflectivities of the first lens insulating layer, the second lens insulating layer, and the lens passivation layer.

4. The display device according to claim 3, wherein: The barrier comprises metal.

5. The display device according to claim 3, wherein: The lens passivation layer includes a material harder than the first lens insulating layer and the second lens insulating layer.

6. The display device according to claim 5, wherein: The first lens insulating layer and the second lens insulating layer include an organic insulating material, and the lens passivation layer includes an inorganic insulating material.

7. The display device according to claim 1, wherein: An upper surface of the lens passivation layer facing the color filter has a concave shape toward the device substrate.

8. The display device according to claim 7, wherein: An upper end of the barrier facing the color filter is spaced apart from the color filter, and the lens passivation layer extends between the upper end of the barrier and the color filter.

9. The display device according to claim 7, wherein: The refractive index of the color filter is greater than the refractive index of the lens passivation layer.

10. The display device according to claim 7, wherein: The refractive index of the color filter is less than the refractive index of the lens passivation layer.

11. The display device according to claim 7, wherein: The upper surface of the lens passivation layer and the upper surface of the second lens insulating layer have the same curvature.

12. The display device according to claim 1, wherein: The thickness of the first lens insulating layer disposed in each of the light emitting regions gradually increases from a central region of the corresponding light emitting region toward the barrier.

13. The display device according to claim 1, wherein: A boundary between the first lens insulating layer and the second lens insulating layer provided in each of the light emitting regions functions as a lens.

14. The display device according to claim 1, wherein: A boundary between the second lens insulating layer and the lens passivation layer disposed in each of the light emitting regions functions as a lens.

15. A display device, comprising: a first light emitting device disposed on a first light emitting region of the device substrate; A packaging structure disposed on the first light emitting device, wherein the packaging structure extends outside the first light emitting area; A first lens structure including at least three layers stacked on the encapsulation structure of the first light emitting region; a first barrier disposed on the packaging structure, wherein the first barrier is in contact with a side of the first lens structure; as well as a first color filter disposed on the first lens structure, wherein the first color filter overlaps the first light emitting area in a plan view, Each layer of the first lens structure has a larger refractive index as it moves away from the packaging structure, and Wherein, each of the boundaries between the layers within the first lens structure has a convex shape toward the device substrate.

16. The display device according to claim 15, wherein: A vertical distance between the device substrate and each boundary increases from a central area of ​​the first light emitting region to the first barrier.

17. The display device according to claim 15, further comprising: a second light emitting device disposed between a second light emitting region of the device substrate and the packaging structure; A second lens structure including at least three layers stacked on the encapsulation structure of the second light emitting region; a second barrier disposed on the packaging structure, wherein the second barrier contacts a side of the second lens structure; as well as a second color filter disposed on the second lens structure, wherein the second color filter overlaps the second light emitting area when viewed from a plan view, The first barrier and the second barrier extend in a first direction. wherein the second light emitting area is arranged side by side with the first light emitting area in the first direction, and The second color filter includes the same material as the first color filter.

18. The display device according to claim 17, wherein: The second barrier is spaced apart from the first barrier between the first light emitting area and the second light emitting area. 19 . The display device of claim 17 , further comprising a third barrier disposed between the first light emitting area and the second light emitting area, the third barrier extending in a second direction perpendicular to the first direction.

20. The display device according to claim 15, further comprising: a third light emitting device, the third light emitting device being disposed between a third light emitting region of the device substrate and the packaging structure; a third lens structure, the third lens structure comprising at least three layers stacked on the encapsulation structure of the third light emitting region; A fourth barrier member disposed on the packaging structure, wherein the fourth barrier member contacts a side portion of the third lens structure; as well as a third color filter disposed on the third lens structure, the third color filter overlapping the third light emitting area, Each layer of the third lens structure has a larger refractive index as it moves away from the packaging structure, and Wherein, each of the boundaries between the layers in the third lens structure has a convex shape toward the device substrate.

21. A display device, comprising: A light emitting device disposed on a plurality of light emitting regions of a device substrate; A packaging structure disposed on the device substrate, wherein the packaging structure covers the light-emitting device; a plurality of lens structures, each of the plurality of lens structures comprising a plurality of layers stacked on the encapsulation structure of the plurality of light emitting regions; as well as a plurality of color filters disposed on the plurality of lens structures, each of the plurality of color filters overlapping with each of the plurality of light emitting regions; Each layer of each lens structure in the plurality of lens structures has a larger refractive index as it moves away from the packaging structure, and Wherein, each of the boundaries between the layers within each of the plurality of lens structures has a convex shape toward the device substrate.

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